Letteratura scientifica selezionata sul tema "Batterie a flux"
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Articoli di riviste sul tema "Batterie a flux":
1
GILLOT, S., Y. FAYOLLE e C. ROCHE. "Densification des boues activées par hydrocyclones – impact de la granulation partielle sur les performances de traitement". Techniques Sciences Méthodes 12 (20 gennaio 2023): 133–47. http://dx.doi.org/10.36904/202212133.
Abstract (sommario):
Pour traiter les eaux résiduaires, le procédé à boues activées conventionnel reste le plus utilisé dans les pays industrialisés. Ce procédé peut être intensifié en densifiant la biomasse épuratoire. L’installation d’hydrocyclones sur la boucle d’extraction des boues, créant une pression de sélection des particules les plus denses, est l’une des méthodes de densification employées. L’objectif de cet article est d’analyser le fonctionnement d’une file de traitement par boues activées de la station d’épuration de Dijon, équipée d’une batterie d’hydrocyclones. Les performances obtenues ont été comparées à celles d’une file témoin. Les résultats montrent la nette amélioration de la capacité des boues à décanter de la file densifiée, et le maintien d’un indice de boues inférieur à 100 mL/g, même en début de période hivernale habituellement accompagné d’un foisonnement filamenteux. Les performances de traitement sur les deux files sont similaires pour le traitement du carbone. La file densifiée montre un fléchissement du flux nitrifié, lié à une limitation de l’apport d’oxygène. Des mesures complémentaires sont requises pour imputer cette limitation à la taille des particules, significativement plus élevée dans la file densifiée, ou à une capacité de transfert d’oxygène différente, en lien avec les modifications de comportement rhéologique observées. Ces mesures permettront également de préciser le bilan énergétique du système, en prenant en compte l’ensemble des modifications induites (puissances d’agitation et de pompage requises, notamment).
2
Chen, Ming Yi, Richard Yuen e Jian Wang. "Experimental Study on the Bundle Lithium-Ion Batteries Fire". Materials Science Forum 890 (marzo 2017): 263–66. http://dx.doi.org/10.4028/www.scientific.net/msf.890.263.
Abstract (sommario):
In this paper, a report is given on an experimental study of the combustion characteristics of six bundle lithium-ion batteries in a calorimeter. Several parameters including mass loss, heat release rate, surface temperature and heat flux distribution were measured to evaluate the hazards. The experimental results show that the lithium-ion batteries undergo fierce combustion processes. The total mass loss of six lithium-ion batteries fire is 67.8g, and the effective heat of the fire is 7.06 kJ/g. The highest temperature of the batteries fire is 816.9 °C and the maximum heat flux is 0.68 kW/m2.The results provide scientific basis for the development of fire protection measures during the usage, storage and distribution of primary lithium batteries.
3
Ahmedov, B. J. "On a Possibility to Measure Thermo-Electric Power in SNS Structures". Modern Physics Letters B 12, n. 16 (10 luglio 1998): 633–37. http://dx.doi.org/10.1142/s0217984998000743.
Abstract (sommario):
Two dissimilar Josephson junctions, which are connected to a heater can act as precise batteries. Because of the di erencein thermoelectric power of these batteries, circuit with two dissimilar batteries, under heat flow ΔT~10-5 K would have a net EMF 10-11 V around the zero-resistance loop leading to a loop's time-varying magnetic flux. It is shown that its theoretical value is proportional to both the temperature difference as well as the disparity in the thermoelectric powers of the two junctions.
4
Li, Zhen Zhe, Yun De Shen, Gui Ying Shen, Mei Qin Li e Ming Ren. "Parameter Study on Cooling System of Battery for HEV". Advanced Materials Research 538-541 (giugno 2012): 2038–42. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.2038.
Abstract (sommario):
A hybrid power composed of the fuel cell and MH-Ni battery has become a good strategy for HEV, but the performance of the battery cooling systems can not be easily adjusted. In this study, heat flux of the batteries and mass flow rate of cooling air have been investigated to improve the performance of a battery cooling system. As shown in the results, the error of root mean square has been decreased under the condition of decreasing heat flux of the batteries, and the performance of the battery cooling system has been improved with increasing the mass flow rate of cooling air. The analysis model developed in this study can be widly used to find out an optimal battery cooling system in the future work.
5
Liu, Yue, Bin Li, Jianhua Liu, Songmei Li e Shubin Yang. "Pre-planted nucleation seeds for rechargeable metallic lithium anodes". Journal of Materials Chemistry A 5, n. 35 (2017): 18862–69. http://dx.doi.org/10.1039/c7ta04932c.
Abstract (sommario):
Pre-planted nano copper particles not only played as nucleation seeds but also regulated the Li+ flux during lithium striping/plating process, leading to high cycling stability for rechargeable metallic lithium batteries.
6
Wu, Zhiheng, Yongshang Zhang, Lu Li, Yige Zhao, Yonglong Shen, Shaobin Wang e Guosheng Shao. "Nitrogen-doped vertical graphene nanosheets by high-flux plasma enhanced chemical vapor deposition as efficient oxygen reduction catalysts for Zn–air batteries". Journal of Materials Chemistry A 8, n. 44 (2020): 23248–56. http://dx.doi.org/10.1039/d0ta07633c.
Abstract (sommario):
Low temperature deposition of N-doped vertical graphene realized at low temperature lab-built high-flux plasma enhanced chemical vapor deposition (HPECVD) system, with outstanding catalytic performance enabled for ORR in Zn–air batteries.
7
Zeising, Samuel, Rebecca Seidl, Angelika Thalmayer, Georg Fischer e Jens Kirchner. "Low-Frequency Magnetic Localization of Capsule Endoscopes with an Integrated Coil". Engineering Proceedings 6, n. 1 (17 maggio 2021): 38. http://dx.doi.org/10.3390/i3s2021dresden-10146.
Abstract (sommario):
Wireless capsule endoscopy is a promising and less invasive alternative to conventional endoscopy. A patient swallows a small capsule with an integrated camera to capture a video of the gastrointestinal tract. For accurate diagnosis and therapy, the capsule position in terms of the travelled distance must be known for each video frame. However, to date, there is no reliable localization method for endoscopy capsules. In this paper, a novel magnetic localization method is proposed. A coil as a magnetic field source is integrated into a capsule and fed with a low-frequency alternating current to prevent static geomagnetic field interference. This alternating magnetic field is measured by twelve magnetic sensors arranged in rings around the abdomen. The coil and the capsule batteries were designed based on the geometry and power supply of a commercially available endoscopy capsule and simulated by COMSOL Multiphysics software. In this way, the coil position and orientation were determined with an accuracy below 1 mm and 1°, respectively. As an analytic model for the magnetic flux density of the coil in that setup, a modified dipole model was derived. It was used to show that the batteries help to increase the amplitude of the magnetic flux density. The model is valid when signals below 100 Hz are applied, and no eddy currents are generated within the batteries. It is concluded that the magnetic flux density generated by the developed coil would be measurable with state-of-the-art magnetic sensors.
8
Benavides, Darío, Paúl Arévalo, Luis G. Gonzalez e José A. Aguado. "Analysis of Different Energy Storage Technologies for Microgrids Energy Management". E3S Web of Conferences 173 (2020): 03004. http://dx.doi.org/10.1051/e3sconf/202017303004.
Abstract (sommario):
The importance of energy storage systems is increasing in microgrids energy management. In this study, an analysis is carried out for different types of energy storage technologies commonly used in the energy storage systems of a microgrid, such as: lead acid batteries, lithium ion batteries, redox vanadium flux batteries and supercapacitors. In this work, it is analyzed the process of charging and discharging (slow and fast) in these systems, the calculation of energy efficiency, performance and energy supplied under different load levels, in its normal operating conditions and installed power capacity is developed. The results allow us to choose the optimal conditions of charge and discharge at different levels of reference power, analyzing the strengths and weaknesses of the characteristics of each storage system within a microgrid.
9
Song, Sung-Geun, Seong-Mi Park e Sung-Jun Park. "New Battery Balancing Circuit using Magnetic Flux Sharing". Journal of Power Electronics 14, n. 1 (20 gennaio 2014): 194–201. http://dx.doi.org/10.6113/jpe.2014.14.1.194.
10
Janzen, Andrew W., e John R. Natzke. "Magnetic Battery Feasibility Study Using Flux Switching Topology". IEEE Transactions on Magnetics 51, n. 6 (giugno 2015): 1–8. http://dx.doi.org/10.1109/tmag.2014.2343995.
Tesi sul tema "Batterie a flux":
1
Cadiou, Vincent. "Développement de matériaux d'électrodes organiques pour batterie anionique". Thesis, Nantes, 2018. http://www.theses.fr/2018NANT4024/document.
Abstract (sommario):
Une nouvelle génération de batteries, à base de matériaux d’électrodes organiques, pourrait répondre en partie à la demande croissante en moyen de stockage de l’énergie, sans épuiser les ressources naturelles, à contrario des technologies actuellement commercialisées. Grâce à la diversité structurale de la chimie organique, de nouvelles opportunités existent permettant d’entrevoir le développement de batteries de type « rocking-chair anionique » grâce à l’intégration de matériaux d’électrode organiques de type p, avec la potentialité in fine de ne renfermer aucun métaux. Cependant, un choix limité de matériaux organiques de type p est rapporté dans la littérature. Le premier objectif de cette thèse a consisté à synthétiser deux matériaux d’électrodes positives de type p, les 2,5-dianilinotéréphtalates de dilithium et de magnésium. Un soin particulier a été pris pour favoriser des stratégies de synthèse intégrant au mieux les principes de la chimie « verte ». Des monocristaux de ces sels, développés en voie aqueuse, ont permis la résolution de leur structure cristalline, conduisant à une meilleure interprétation de leurs mécanismes électrochimiques. Dans un second temps, nous avons développé des matériaux polymériques d’électrodes négatives de type p appelés polyviologènes. D’ordinaire facilement solubles dans les solvants d’électrolytes de type carbonates organiques, nous avons modifié leurs structures afin d’augmenter leur tenue en cyclage. La dernière partie de cette thèse a consisté à optimiser la formulation des électrodes positives et négatives développées au cours de la thèse, afin d’assembler des batteries « tout organique » anioniques performantes, lesquelles ont permis d’obtenir une tension de cellule de 0,7 VA new generation of organic batteries could partly meet the growing demand for energy storage without depleting natural resources, in contrast to current technologies. Thanks to the structural diversity of organic chemistry, new opportunities exist allowing the development of "anionic rocking chair" batteries, through the integration of p-type organic electrode materials, with the ultimate potentiality to avoid any metals. However, a limited choice of p-type organic materials is reported in the literature. The first objective of this thesis was to synthesize two p-type positive electrode materials, dilithium and magnesium 2,5-dianilinoterephthalates. Particular care has been taken to promote synthesis strategies that best integrate the principles of "green" chemistry. Single crystals of these salts, developed in water, allowed the resolution of their crystalline structure, leading to a better interpretation of their electrochemical mechanisms. In a second step, we developed polymeric p-type materials for negative electrodes called polyviologens. Usually soluble in organic carbonate type electrolyte solvents, we have modified their structures to increase their cycling behavior. The last part of this thesis consisted in optimizing the formulation of the positive and negative electrodes developed during the thesis, in order to assemble efficient "all organic" anionic batteries, which allowed to obtain a cell voltage of 0.7 V
2
Charyton, Martyna. "Ion exchange coatings for porous separator membranes in RFB applications". Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0266.
Abstract (sommario):
Cette étude s'est concentrée sur la fabrication d'une membrane échangeuse d'anions composite À partir d'une étude de la littérature sur différents types de membranes échangeuses d'ions (IEM), nous avons pu conclure qu’à la fois la structure chimique de la membrane ainsi que son processus de fabrication affectent leurs propriétés de transport ionique. Une structure composite hiérarchique de la membrane a alors été considérée comme avantageuse par rapport à la membrane dense et autoportée. Les membrane présentées se composent d'un substrat poreux en poly(chlorure de vinyle)-silice et d'une couche d'ionomère appliquée dessus. Cette membrane composite est conçue pour que le substrat assure la stabilité dimensionnelle et limite la quantité de matériau échangeur d'anions nécessaire. La couche échangeuse d'ions a été appliquée sur le substrat poreux à l'aide d'une technique de revêtement par lame et de durcissement aux UV qui peuvent être facilement adoptée dans un processus rouleau-à-rouleau. Tout d'abord, la couche échangeuse d'ions a été fabriquée par immobilisation d'un polymère hydrosoluble – poly(vinylpyrrolidone) (PVP) dans une matrice d'acrylamides et de résine acrylique. Tous les produits chimiques utilisés sont des réactifs industriels de base. De plus, faire varier la teneur en PVP de 6% en poids jusqu'à 16% permet de contrôler les propriétés de transport d'ions de la membrane. Les membranes avec des teneurs inférieures en PVP gonflent moins en milieu aqueux et présentent une perméabilité aux cations conforme à une membrane commercial (FAP 450) mais pour une conductivité ionique plus faible. Les tests de performance effectués pour un système de batterie à flux redox tout vanadium de référence (VRFB) démontrent que les membranes à base de PVP peuvent atteindre une efficacité énergétique (EE) comparable à celle d'une membrane de référence commerciale (74,7% contre 73,0% pour FAP 450 et 75,0% pour Nafion N115). Cependant, une dégradation oxydative a été observée dans un test de stabilité ex-situ. Ainsi, l'étape suivante a été d'utiliser un ionomère pouvant également servir d'agent de réticulation, stable dans l'environnement de l'électrolyte de vanadium. Le vinylimidazolium poly(oxyde de phénylène) (VIMPPO) a été synthétisé. Le VIMPPO seul durci aux UV était trop densément réticulé et présentait une résistivité spécifique élevée. Pour diminuer la résistivité de la membrane, le VIMPPO a été utilisé en combinaison avec des monomères d'acrylamide. L'étude en batterie VRFB a montré une amélioration des performances de la membrane composite par rapport aux membranes à base de PVP. Une membrane avec 15 wt.% de VIMPPO dans la couche de revêtement a permis une efficacité énergétique élevée - 75,1% pendant les expériences de cyclage VRFB et une rétention de capacité conforme aux résultats des membranes commerciales. Néanmoins, quelques indices de dégradation oxydative ont encore été observés. Suite à l'étude prometteuse sur le VIMPPO, la génération suivante de membranes composites a été fabriquée en utilisant VIMPPO sans acrylamides afin de garantir une bonne stabilité chimique. Pour éviter une densité excessive après réticulation, le VIMPPO a été formulé avec des monomères durcissables aux UV avec des groupes ammonium quaternaire. Ces monomères peuvent former des ponts moléculaires d'espacement entre les chaînes de l’ionomère conduisant à sa structure desserrée. La membrane fabriquée à l'aide de chlorure de (vinylbenzyl)triméthylammonium a permis d'atteindre des performances considérablement améliorées par rapport aux membranes commerciales montrant une efficacité énergétique plus élevée 77,4%. De plus, la stabilité de ce type de membranes était meilleure que celle des membranes précédemment fabriquées, permettant de réaliser des expériences de cyclage à long terme au cours desquelles les membranes présentaient des performances stablesThis study was focused on the fabrication of a composite anion exchange membrane in an industrially oriented process. From a literature study on different types of ion exchange membranes (IEMs), it can be concluded that both the chemical structure of the membrane as well as their fabrication process affect their ionic-transport properties. A hierarchical, composite structure of the membrane was considered as advantageous over the dense, self-supported membrane. The presented membrane consists of a porous poly(vinyl chloride) (PVC)-silica substrate (600 µm) and a layer of ionomer (20 – 40 µm) applied on top of it. It is designed so that the substrate ensures dimensional stability and limits the amount of anion exchange material needed, allowing for a lower cost of fabrication. The ion-exchange layer was applied on the porous substrate using blade-coating technique and UV-curing which can be easily adopted in a large-scale, roll-to-roll process. Three different approaches are described in the corresponding chapters. Firstly, the ion exchange layer was fabricated by immobilization of a water-soluble polymer – poly(vinyl pyrrolidone) (PVP) in a matric of acrylamides and acrylic resin. All of the used chemicals are commodity reagents, which can be seen as an economic advantage of such coatings over the commercial IEMs. Moreover, varying the content of PVP from 6 wt.% up to 16% allows controlling the ion transport properties of the membrane. Membranes with lower contents of PVP swell less in aqueous media and exhibit permeability to cations in line with the commercial AEM (FAP 450) but with a lower ion conductivity. The performance tests carried out for a benchmark All-Vanadium Redox Flow Battery system (VRFB) demonstrate that PVP-based membranes can reach comparable energy efficiency (EE) to the one of a commercial, benchmark membrane (74.7% versus 73.0% for FAP 450 and 75.0% for Nafion® N115). However, oxidative degradation was observed in an ex-situ stability test. Thus, the next step was to use an ionomer that can also serve as a crosslinking agent, stable in the environment of the vanadium electrolyte. Vinylimidazolium poly(phenylene oxide) (VIMPPO) was synthesized with 50 % of the degree of functionalization. Such ionomer exhibited high ion exchange capacity: 2.4 mmol g-1. In parallel, UV-cured alone VIMPPO was too densely crosslinked and demonstrated high area-specific resistivity. To decrease the resistivity of the membrane, VIMPPO was used in combination with acrylamide monomers. This allowed to decrease the content of the synthesized ionomer. VRFB cycling study showed an improvement of the composite membrane performance in comparison to the PVP-based AEMs. A membrane with 15 wt. % of VIMPPO in the coating layer allowed for high energy efficiency – 75.1 % (at 80 mA cm-2) during the VRFB cycling experiments and capacity retention in line with the results of the commercial IEMs. Nevertheless, some indications of oxidative degradation were still observed. Following the promising study on the VIMPPO, the next generation of the composite membranes was fabricated using VIMPPO without acrylamides in order to secure chemical stability. To prevent excessive density of the crosslinking, VIMPPO was formulated with UV-curable monomers with quaternary ammonium groups. Those monomers can form spacing molecular bridges between the chains of the ionomer leading to its loosened structure. The membrane fabricated using (vinylbenzyl)trimethylammonium chloride allowed to reach significantly enhanced performance in comparison to the commercial IEMs showing higher energy efficiency (77.4 %) and lower capacity decay than in the case of FAP 450 or Nafion® N115. Furthermore, the stability of this type of membranes was better than previously fabricated membranes, allowing to perform long-term cycling experiments (75 cycles at 50 mA cm-2) during which the membranes exhibited stable performance
3
Parant, Hélène. "Le concept d'électrodes liquides de carbone appliqué au domaine des batteries en flux : étude et application aux matériaux d'intercalation du lithium". Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0726/document.
Abstract (sommario):
Cette thèse porte sur les batteries en flux, une thématique en plein essor pour le stockage massif des énergies intermittentes. Ce travail a pour but de réaliser de nouveaux types d'électrolytes liquides, avec des particules de carbone, afin d'améliorer la puissance. Ce concept est appelé "électrodes liquides" et a été mis en pratique dans une batterie en flux à base de particules d'intercalation du lithium en milieu aqueux. Tout d'abord, l'objectif est de formuler les électrolytes de carbone avec une bonne conductivité électrique (1-4 mS/cm) et une viscosité raisonnable. Ce compromis a été trouvé grâce à l'étude de la méthode de mélange et du type de carbone. La conductivité électrique a été étudiée par impédancemétrie et en flux afin de tester la solidité du réseau de carbone en écoulement. Ces électrolytes de carbone ont été testés en présence d'espèces solubles, sur une batterie millifluidique modèle ferrocyanure/iode. L'étude a été complétée par une modélisation de la diffusion des espèces. L'effet du flux sur l'intensité a été étudié ainsi que l'influence de la cinétique de l'espèce redox. Enfin, ces électrolytes de carbone ont été utilisés pour réaliser des batteries en flux entièrement à base de particules. En particulier, la décharge d'une batterie LiFePO4{MnO2 en flux continu, a présenté une densité de courant entre 5 et 30 mA{cm2, ce qui est entre 10 et 100 fois supérieur aux valeurs de la littératureThis project deals with flow batteries, which are very promising technologies for large scale energy storage, especially for intermittent energies. This work aims at developing new types of electrolytes with carbon particles to enhance power of batteries. This concept is called "liquid electrode" and is implemented in flow batteries with redox lithium intercalation particles in aqueous media. The first objective is to formulate the carbon electrolyte, with a good electronic conductivity (1-4 mS/cm) and a reasonable viscosity. A compromise is reached thanks to the study of the mixing procedure and the carbon type. Conductivity is also studied by impedance spectroscopy and in flow to visualize the strength of the carbon network. The electrolytes are then, tested in a ferrocyanide/iodine millifluidic battery. The conversion of the soluble species is compared with a modelisation. A particular attention is paid to the effect of the flow and the kinetic on the battery intensity. Finally, these carbon electrolytes are used in a particles-based flow battery. For example, a battery LiFePO4{MnO2 demonstrates in flow, an intensity recovery between 5 et 30 mA{cm2 which is around 10 to 100 times higher than values reported in literature
4
Cazot, Mathilde. "Development of Analytical Techniques for the Investigation of an Organic Redox Flow Battery using a Segmented Cell". Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0116.
Abstract (sommario):
Les batteries à électrolyte circulant ou redox flow batteries (RFB) représentent une technologie prometteuse pour répondre aux besoins grandissants de stockage d'énergie. Elles seraient particulièrement adaptées aux réseaux électriques qui comptent une part grandissante d'énergie d'origine renouvelable, produite en intermittence. L'objet de ce travail est l'étude d'un nouveau type de RFB, actuellement développé par l'entreprise Kemiwatt. Il repose sur l'utilisation de molécules organiques, qui sont abondantes et recyclables. Le but de cette étude est d'améliorer la compréhension fondamentale de la batterie grâce à l'utilisation d'outils d'analyse précis et innovants. Chaque composant du système a d'abord été analysé via des moyens expérimentaux ex-situ. Les deux électrolytes composant la batterie ont ensuite été étudiés séparément en conditions réelles de circulation dans une cellule symétrique. Couplées à un modèle d'électrode volumique, les données ont été analysées pour identifier les facteurs limitants de chaque solution. La batterie entière a ensuite été étudiée dans un dispositif segmenté, permettant l'accès à la distribution interne du courant. Une étude paramétrique, réalisée avec la cellule segmentée a permis d'observer les effets du courant, du débit et de la température sur le fonctionnement de la cellule, puis d'établir une cartographie des conditions de fonctionnement idéales, suivant la puissance et l'état de charge de la batterie. L'aspect hydrodynamique du système a finalement été abordé en développant un modèle fluidique ainsi qu'une maquette expérimentale de cellule transparente pour visualiser l'écoulementRedox Flow Batteries (RFBs) are a promising solution for large-scale and low-cost energy storage necessary to foster the use of intermittent renewable sources. This work investigates a novel RFB chemistry under development at the company Kemiwatt. Based on abundant organic/organo-metallic compounds, this new technology promises the deployment of sustainable and long-lived systems. The study undertakes the building of a thorough knowledge base of the system by developing innovative reliable analytical tools. The investigation started from the evaluation of the main factors influencing the battery performance, which could be conducted ex-situ on each material composing the cell. The two electrolytes were then examined independently under representative operating conditions, by building a symmetric flow cell. Cycling coupled with EIS measurements were performed in this set-up and then analyzed with a porous electrode model. This combined modeling-experimental approach revealed unlike limiting processes in each electrolyte along with precautions to take in the subsequent steps (such as membrane pretreatment and electrolyte protection from light). A segmented cell was built and validated to extend the study to the full cell system. It provided a mapping of the internal currents, which showed high irregularity during cycling. A thorough parameter study could be conducted with the segmented platform, by varying successively the current density, the flow rate, and the temperature. The outcome of this set of experiments would be the construction of an operational map that guides the flow rate adjustment, depending on the power load and the state of charge of the battery. This strategy of flow rate optimization showed promising outcomes at the lab-cell level. It can be easily adapted to real-size systems. Ultimately, an overview of the hydrodynamic behavior at the industrial-cell level was completed by developing a hydraulic modeling and a clear cell as an efficient diagnostic tool
5
Cazot, Mathilde. "Development of Analytical Techniques for the Investigation of an Organic Redox Flow Battery using a Segmented Cell". Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0116.
Abstract (sommario):
Les batteries à électrolyte circulant ou redox flow batteries (RFB) représentent une technologie prometteuse pour répondre aux besoins grandissants de stockage d'énergie. Elles seraient particulièrement adaptées aux réseaux électriques qui comptent une part grandissante d'énergie d'origine renouvelable, produite en intermittence. L'objet de ce travail est l'étude d'un nouveau type de RFB, actuellement développé par l'entreprise Kemiwatt. Il repose sur l'utilisation de molécules organiques, qui sont abondantes et recyclables. Le but de cette étude est d'améliorer la compréhension fondamentale de la batterie grâce à l'utilisation d'outils d'analyse précis et innovants. Chaque composant du système a d'abord été analysé via des moyens expérimentaux ex-situ. Les deux électrolytes composant la batterie ont ensuite été étudiés séparément en conditions réelles de circulation dans une cellule symétrique. Couplées à un modèle d'électrode volumique, les données ont été analysées pour identifier les facteurs limitants de chaque solution. La batterie entière a ensuite été étudiée dans un dispositif segmenté, permettant l'accès à la distribution interne du courant. Une étude paramétrique, réalisée avec la cellule segmentée a permis d'observer les effets du courant, du débit et de la température sur le fonctionnement de la cellule, puis d'établir une cartographie des conditions de fonctionnement idéales, suivant la puissance et l'état de charge de la batterie. L'aspect hydrodynamique du système a finalement été abordé en développant un modèle fluidique ainsi qu'une maquette expérimentale de cellule transparente pour visualiser l'écoulementRedox Flow Batteries (RFBs) are a promising solution for large-scale and low-cost energy storage necessary to foster the use of intermittent renewable sources. This work investigates a novel RFB chemistry under development at the company Kemiwatt. Based on abundant organic/organo-metallic compounds, this new technology promises the deployment of sustainable and long-lived systems. The study undertakes the building of a thorough knowledge base of the system by developing innovative reliable analytical tools. The investigation started from the evaluation of the main factors influencing the battery performance, which could be conducted ex-situ on each material composing the cell. The two electrolytes were then examined independently under representative operating conditions, by building a symmetric flow cell. Cycling coupled with EIS measurements were performed in this set-up and then analyzed with a porous electrode model. This combined modeling-experimental approach revealed unlike limiting processes in each electrolyte along with precautions to take in the subsequent steps (such as membrane pretreatment and electrolyte protection from light). A segmented cell was built and validated to extend the study to the full cell system. It provided a mapping of the internal currents, which showed high irregularity during cycling. A thorough parameter study could be conducted with the segmented platform, by varying successively the current density, the flow rate, and the temperature. The outcome of this set of experiments would be the construction of an operational map that guides the flow rate adjustment, depending on the power load and the state of charge of the battery. This strategy of flow rate optimization showed promising outcomes at the lab-cell level. It can be easily adapted to real-size systems. Ultimately, an overview of the hydrodynamic behavior at the industrial-cell level was completed by developing a hydraulic modeling and a clear cell as an efficient diagnostic tool
6
Debert, Maxime. "Stratégies optimales multi-critères, prédictives, temps réel de gestion des flux d'énergie thermique et électrique dans un véhicule hybride". Phd thesis, Université d'Orléans, 2011. http://tel.archives-ouvertes.fr/tel-00867007.
Abstract (sommario):
La gestion d'énergie d'un véhicule hybride consiste à développer une stratégie, qui détermine à chaque instant la répartition des flux d'énergie thermique et électrique, minimisant la consommation globale du véhicule. La modélisation de la consommation du véhicule hybride permet d'écrire cette problématique sous la forme d'un problème d'optimisation dynamique sous contraintes d'évolutions. Ce problème est résolu de façon optimale lorsque l'ensemble des conditions de roulage sont connues à priori. La commande optimale obtenue sert de référence pour évaluer la performance des stratégies embarquées dans le véhicule. En s'appuyant sur la théorie de l'optimisation optimale, deux stratégies ont été crées : l'une prédictive qui a été testée sur un simulateur numérique et une autre, reposant sur le principe du problème dual, qui a été embarqué avec succès sur deux véhicules hybrides conventionnels. Pour les hybrides rechargeables, leur capacité énergétique et la possibilité de se recharger sur le réseau électrique libère des contraintes dans la problématique d'optimisation énergétique. C'est pourquoi, une nouvelle stratégie spécifique a été développée dans l'objectif de profiter au maximum de l'énergie électrique embarquée pour minimiser les émissions du véhicule. Pour l'ensemble des véhicules hybrides, la batterie est un composant clef dont le vieillissement vient modifier sa rentabilité économique et énergétique. C'est pourquoi un observateur a été conçu pour fournir une information précise de la température interne des cellules. Cette information est utilisée par une stratégie spécifique optimisant la consommation tout en préservant la batterie des températures extrêmes, nuisibles à sa longévité.
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Deschanels, Mathieu. "Développement de systèmes électrochimiques innovants pour applications en batteries à flux circulants". Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTS062.
Abstract (sommario):
Les batteries à flux circulants sont des dispositifs de stockage électrochimique de l’énergie caractérisés par la possibilité de dissocier leur énergie de leur puissance. Cette propriété donne à ces systèmes une grande adaptabilité facilitant leur mise à l’échelle pour développer des dispositifs de stockage de masse. Ces batteries bien que disposant de propriétés intéressantes sont encore limitées par leurs coûts et les faibles densités d’énergie qu’elles développent.Dans cette thèse, plusieurs axes ont été envisagés pour permettre l’amélioration de leurs performances. Les matériaux carbonés sont très utilisés dans ces systèmes (électrodes, configuration semi-solide). Les modifications de surfaces permettent d’ajuster les propriétés d’interface entre les matériaux carbonés et l’électrolyte. Dans une première étude, une méthode de modification basée sur la réaction de Diels-Alder est développée. L’objectif est de proposer un protocole de modification simple et adaptable pour différents groupements chimiques. Dans une seconde étude, la modification d’électrode de carbone par la réduction chimique de cations diazonium est réalisée avec des molécules hydrophobes. L’objectif est d’empêcher l’accès des molécules d’eau à la surface de l’électrode pour inhiber la réduction électrochimique de l’eau. Dans un troisième volet, une configuration de batterie utilisant deux pH différents dans le compartiment positif et négatif est étudiée. Cette configuration doit permettre une meilleure versatilité dans le choix des couples rédox ainsi que le développement de systèmes avec de plus grandes tensions de celluleRedox flow batteries are electrochemical energy storage devices characterized by its ability to dissociate their energy from their power. This property gives these systems a great adaptability facilitating their scalability to develop mass storage devices. These batteries, although having interesting properties, are still limited by their cost and the low energy densities they develop.In this thesis, several axes have been considered to improve their performance. Carbonaceous materials are widely used in these systems (electrodes, semi-solid configuration). Surface modifications allow to adjust the interface properties between the carbonaceous materials and the electrolyte. In a first study, a modification method based on the Diels-Alder reaction is developed. The objective is to propose a simple and adaptable modification protocol for different chemical moieties. In a second study, carbon electrode modification by chemical reduction of diazonium cations is performed with hydrophobic molecules. The objective is to prevent the access of water molecules to the electrode surface to inhibit the electrochemical reduction of water. In a third part, a battery configuration using two different pH in the positive and negative compartment is studied. This configuration should allow a better versatility in the choice of redox couples as well as the development of systems with higher cell voltages
8
Jouhara, Alia. "De la conception de matériaux d'électrode organiques innovants à leur intégration en batteries "tout organique"". Thesis, Nantes, 2018. http://www.theses.fr/2018NANT4026/document.
Abstract (sommario):
Répondre aux besoins croissants en termes de stockage électrochimique sans épuiser les ressources naturelles exige de promouvoir des technologies de batteries en rupture à la fois efficientes mais aussi à faible impact au plan environnemental. La conception de batteries organiques pourrait s'avérer être une partie de la solution. En effet, la richesse de la chimie organique offre une multitude de possibilités pour développer des matériaux d'électrode innovants à partir d’éléments abondants et peu coûteux. Près de 40 ans après la découverte des polymères conducteurs, des batteries Li-organiques offrent maintenant d’intéressantes performances en cyclage. Pourtant, la synthèse de matériaux organiques lithiés électroactifs à haut-potentiel ainsi que celle de matériaux organiques de type p électroactifs à bas potentiel se sont avérées assez complexes et par conséquent, très peu d'exemples de cellules « tout organique » existent. Au cours de ce travail de recherche, nous avons mis en lumière une approche chimique originale consistant à perturber la structure électronique de l’entité organique électroactive (modulation des effets inductifs) au moyen d’un cation spectateur faiblement électropositif ce qui conduit à une augmentation significative du potentiel redox des matériaux d'électrodes organiques lithiés déjà connus. Cette découverte nous a permis de développer une batterie Li-ion « tout organique » capable d’offrir une tension de sortie d’au moins 2,5 V sur plus de 300 cycles. Ensuite, nous avons cherché à concevoir des matériaux de type p capables de fonctionner à bas potentiel et ainsi élaboré des batteries Anion-ion « tout organique ». Enfin, une étude préliminaire d’une nouvelle famille de composés potentiellement bipolaires au plan redox (intégration de centres redox de type n et de type p) a également été réaliséeMeeting the ever-growing demand for electrical storage devices, without depleting natural resources, requires both superior and “greener” battery technologies. Developing organic batteries could well provide part of the solution since the richness of organic chemistry affords us a multitude of avenues for uncovering innovative electrode materials based on abundant, low-cost chemical elements. Nearly 40 years after the discovery of conductive polymers, long cycling stability in Li-organic batteries has now been achieved. However, the synthesis of high-voltage lithiated organic cathode materials and the synthesis of low-voltage p type organic anode materials is still rather challenging, so very few examples of all-organic cells currently exist. Herein, we first present an innovative approach consisting in the substitution of spectator cations and leading to a significant increase of the redox potential of lithiated organic electrode materials thanks to an inductive effect. These results enable developing an all-organic Li-ion battery able to deliver an output voltage above 2.5 V for more than 300 cycles. We then design two p type organic electrode materials able of being charged at low potentials for developing all-organic Anion-ion batteries able to deliver an output voltage at least 1.5 V. Finally, we present a preliminary study of a new family of potentially bipolar compounds
9
Rizk, Rania. "Refroidissement passif de batteries lithium pour le stockage d'énergie". Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC228.
Abstract (sommario):
Ce mémoire présente une étude sur le refroidissement passif de batteries lithium-ion. Il se compose de deux grandes parties. La première partie est une étude expérimentale et numérique du comportement thermique d’une batterie et la seconde partie est l’étude expérimentale d’un système passif pour le refroidissement de plusieurs batteries. Un banc d’essais expérimental a été conçu pour suivre l’évolution thermique des batteries soumises à différents courants de sollicitation. Les batteries prismatiques étudiées sont de type LFP et de capacité 60 Ah. Dans un premier temps, le comportement thermique d’une batterie soumise à des cycles de charge / décharge, est caractérisé expérimentalement. Nous montrons que la température n’est pas uniforme à la surface de la batterie et la zone la plus chaude est identifiée. Dans un second temps, un modèle numérique tridimensionnel a été développé pour prédire la température en tout point de la batterie. Ce modèle thermique permet de prédire notamment les températures à l’intérieur de la batterie, non mesurées expérimentalement et ceci, pour différents courants de sollicitation. Les données d’entrée du modèle sont issues des essais expérimentaux et de la littérature. Cette phase de caractérisation thermique de la batterie est essentielle pour la conception d’un système de refroidissement. Enfin, une étude expérimentale d’un système de refroidissement passif basé sur des caloducs et des plaques à ailettes est réalisée. Plusieurs configurations sont testées au fur et à mesure en apportant des améliorations aboutissant enfin à un système à dix caloducs munis de plaques à ailettes verticales au niveau du condenseur combinés à des plaques à ailettes placées sur les faces des batteriesThis thesis deals with the passive cooling of lithium-ion batteries. It consists of two large parts. The first part is an experimental and numerical study of the thermal behaviour of a battery and the second part is the experimental study of a passive system for the cooling of several batteries. An experimental test bench was designed to monitor the thermal evolution of batteries subjected to different currents. The prismatic batteries studied are made of lithium-iron-phosphate and have a capacity of 60 Ah. In a first step, the thermal behaviour of a battery subjected to charge / discharge cycles is experimentally characterized. We show that the temperature is not uniform at the surface of the battery and the hottest area is identified. In a second step, a three-dimensional numerical model was developed to predict the temperature at any point of the battery. This thermal model makes it possible to predict in particular the temperatures inside the battery, not measured experimentally and this, for different currents. The model input data are from experimental trials and literature. This phase of thermal characterization of the battery is essential for the design of a cooling system. Finally, an experimental study of a passive cooling system based on heat pipes and finned plates is carried out. Several configurations are tested progressively with improvements leading finally to a system with ten heat pipes with vertical finned plates at the condenser combined with finned plates placed on the faces of the batteries
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Alam, Tariq Rizvi. "Modeling and Design of Betavoltaic Batteries". Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/89648.
Abstract (sommario):
The betavoltaic battery is a type of micro nuclear battery that harvests beta emitting radioactive decay energy using semiconductors. The literature results suggest that a better model is needed to design a betavoltaic battery. This dissertation creates a comprehensive model that includes all of the important factors that impact betavoltaic battery output and efficiency.
Recent advancements in micro electro mechanical systems (MEMS) necessitate an onboard miniaturized power source. As these devices are highly functional, longevity of the power source is also preferred. Betavoltaic batteries are a very promising power source that can fulfill these requirements. They can be miniaturized to the size of a human hair. On the other hand, miniaturization of chemical batteries is restricted by low energy density. That is why betavoltaics are a viable option as a power source for sophisticated MEMS devices. They can also be used for implantable medical devices such as pacemakers; for remote applications such as spacecraft, undersea exploration, polar regions, mountains; military equipment; for sensor networks for environmental monitoring; and for sensors embedded in bridges due to their high energy density and long lifetime (up to 100 years).
A betavoltaic battery simulation model was developed using Monte Carlo particle transport codes such as MCNP and PENELOPE whereas many researchers used simple empirical equations. These particle transport codes consider the comprehensive physics theory for electron transport in materials. They are used to estimate the energy deposition and the penetration depth of beta particles in the semiconductors. A full energy spectrum was used in the model to take into account the actual radioactive decay energy of the beta particles. These results were compared to the traditional betavoltaic battery design method of estimating energy deposition and penetration depth using monoenergetic beta average energy. Significant differences in results were observed that have a major impact on betavoltaic battery design. Furthermore, the angular distribution of the beta particles was incorporated in the model in order to take into account the effect of isotropic emission of beta decay. The backscattering of beta particles and loss of energy with angular dependence were analyzed. Then, the drift-diffusion semiconductor model was applied in order to estimate the power outputs for the battery, whereas many researchers used the simple collection probability model neglecting many design parameters. The results showed that an optimum junction depth can maximize the power output. The short circuit current and open circuit voltage of the battery varied with the semiconductor junction depth, angular distribution, and different activities. However, the analysis showed that the analytical results overpredicted the experimental results when self-absorption was not considered. Therefore, the percentage of self-absorption and the source thickness were estimated using a radioisotope source model. It was then validated with the thickness calculated from the specific activity of the radioisotope. As a result, the battery model was improved significantly. Furthermore, different tritiated metal sources were analyzed and the beta fluxes were compared. The optimum source thicknesses were designed to increase the source efficiencies. Both narrow and wide band gap semiconductors for beryllium tritide were analyzed.PHD
Libri sul tema "Batterie a flux":
1
United States. National Aeronautics and Space Administration., a cura di. Effect of NASA advanced designs on thermal behavior of Ni-H₂ cells. [Washington, D.C.]: National Aeronautics and Space Administration, 1987.
Capitoli di libri sul tema "Batterie a flux":
1
"Transient Temperature and Heat Flux Measurement Using Thin-Film Microsensors". In Ultrasonic Welding of Lithium-Ion Batteries, 55–74. ASME Press, 2017. http://dx.doi.org/10.1115/1.861257_ch4.
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Boes, Mary, e Virginia McDermott. "Helping Battered Women: A Health Care Perspective". In Handbook of Domestic Violence Intervention Strategies, 255–77. Oxford University PressNew York, NY, 2002. http://dx.doi.org/10.1093/oso/9780195151701.003.0012.
Abstract (sommario):
Abstract In the midst of a winter ice storm, the wails of ambulance sirens signaled a new arrival to the overburdened emergency room staff every 5 minutes. The ER waiting area was already crowded. Within this onslaught of urgent accident cases and emergent needs of broken bones and flu, Julia Crouse was finally triaged.
3
M. Rishi, Aniket. "Graphene-Based Functional Coatings for Pool Boiling Heat Transfer Enhancements". In Advances in Boiling and Condensation [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.110500.
Abstract (sommario):
Pool boiling heat transfer has proven to be the most effective ways to dissipate the large amount of heat fluxes and achieve the efficient cooling in many industrial applications including high-power electronics cooling, data center cooling, heat exchangers, batteries, refrigeration, and air conditioning. With the aggressive net-zero carbon footprint goals set up by the numerous industries across the globe, the need for development of innovative two-phase cooling solutions is of utmost importance. Graphene, being the highest thermal conductivity material, has been implemented in numerous studies for improving both the critical heat flux (maximum possible heat removed before thermal runaway of the heater surface) and a heat transfer coefficient (determines how efficiently the heat is removed) in pool boiling heat transfer. Initially, this chapter introduces various graphene-based nanomaterials and basics related to structure and characterization of graphene. Later, the highlights of some of the notable research work related to the graphene-based coatings for pool boiling enhancements are discussed. The responsible mechanism for such higher performance is summarized. Concluding remarks and industrial applicability of these techniques are also discussed in this section.
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Chan, C. C., e K. T. Chau. "Electric propulsion". In Modern Electric Vehicle Technology, 67–150. Oxford University PressOxford, 2001. http://dx.doi.org/10.1093/oso/9780198504160.003.0005.
Abstract (sommario):
Abstract An electric propulsion system is the heart of EVs. Its functional block diagram is shown in Fig. 5.1. Its job is to interface batteries with vehicle wheels, transferring energy in either direction as required, with high efficiency, under control of the driver at all times. From the functional point of view, an electric propulsion system can be divided into two parts—electrical and mechanical. The electrical part consists of the subsystems of electric motor, power converter, and electronic controller, whereas the mechanical part includes the subsystems of mechanical transmission (optional), and vehicle wheels. The boundary between the electrical and mechanical parts is the air-gap of the motor, where electromechanical energy conversion is taken place. The electronic controller can be further divided into three functional units℄sensor, interface circuitry and processor. The sensor is used to translate the measurable quantities, such as current, voltage, temperature, speed, torque and flux, into electronic signals. Through the interface circuitry, these signals are conditioned to the appropriate level before being fed into the processor. The processor output signals are usually amplified via the interface circuitry to drive power semiconductor devices of the power converter. The converter acts as a power conditioner that regulates the power flow between the energy source and the electric motor for motoring and regeneration. Finally, the motor interfaces with the vehicle wheels via the mechanical transmission. This transmission is optional because the electric motor can directly drive the wheel as in the case of in-wheel drives (Chan, 1993).
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Serdakova, V. V. "Estimation of Maximum Temperature Deformations of Solar Panels of Earth Remote Sensing Small Satellite “Aist-2D”". In Advances in Transdisciplinary Engineering. IOS Press, 2023. http://dx.doi.org/10.3233/atde230488.
Abstract (sommario):
This article evaluates the temperature deformations of a solar battery panel of a small satellite “Aist-2D” designed for the Earth remote sensing as a result of a thermal shock. Such an assessment is necessary for successful performance of the target tasks of remote sensing of the Earth by a small spacecraft. As a result of the temperature shock, the orientation requirements of the spacecraft may be violated. This is especially true for the angular velocity requirements. The maximum deflection of solar panel is estimated using a one-dimensional thermoelasticity model. The incident heat flux is assumed to be perpendicular to the surface of the solar panel. The panel itself has a flat, non-deformed shape at the time of the temperature shock. This situation makes it possible to estimate the maximum effect of the thermal shock. In this case, the solar panel heating will be maximal. Significance of perturbations from temperature shock leads to the need to take it into account in the analysis of orbital motion of the spacecraft. The stress-strain state of the solar panel has been investigated. The dependences of the deflection of the solar panel points during the temperature shock are obtained. The results of the estimation can be used to assess the impact of thermal shock on the task execution of “Aist-2D”.
Atti di convegni sul tema "Batterie a flux":
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Baviskar, Shreyas, Dipankar Chatterjee, Kiran Chandrakant Jawale e A. Rammohan. "Battery Thermal Management of Lithium Prismatic Cell Battery by Using Different Coolants". In Automotive Technical Papers. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2023. http://dx.doi.org/10.4271/2023-01-5059.
Abstract (sommario):
<div class="section abstract"><div class="htmlview paragraph">Lithium (Li)-based batteries have wide applications in the everyday gadgets. Li-based batteries have prominent usage in the automotive sector. All the major OEMs for manufacturing hybrid electric vehicles (HEVs) and electric vehicles (EVs) use only Li batteries and are still going to continue for the next decades. However, during the operation of these batteries, they are susceptible to environmental and battery factors. The amount of charge currently taken in or out influences the internal resistance and temperature of the battery. Therefore, the amount of heat generated by the Li-ion batteries during operation is critical for designing a cost-effective and efficient thermal management system (TMS) for HEVs and EVs. For that, the right cooling mechanism for a lithium-ion (Li-ion) battery pack is to be chosen for the vehicles and establishing optimal cooling conditions to keep the temperature within a safe range of 15 to 35°C, which is critical to improving performance, safety, and life of the battery. For a high-energy Li-ion battery module, this work provides a comparison of air-type and liquid-type thermal management systems. Computational fluid dynamics (CFD) simulations are used to investigate the cooling performance of thermal management systems with different fluids. In this study, the 12 V modules are made up of five prismatic pouch cells and initial constant heat flux is provided for all the cases. The effect of different coolants (i.e., air, water with ethylene glycol, and nano-coolant) at different flow rates and compositions on the module’s thermal behavior are evaluated and compared. Both air and ethylene glycol and water are given a flow rate of 0.5, 1.0, 1.5, and 2.0 m/s, whereas the nano-coolant is given a flow rate of 1.0 m/s. As the nano-coolant flow rate is increased, the Li-ion temperature drops below its optimum range, hence affecting its performance. The results of this research are being put to use in the development of a more effective energy-saving battery temperature management system and in the widespread adoption of nano-coolant for Li batteries. It is observed that the nanofluid gave a superior performance in terms of temperature reduction, that is, 5.04% and 2.97% more efficient than air-cooling and water + ethylene glycol cooling.</div></div>
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Lall, Pradeep, e Hyesoo Jang. "ANN Based Assessment of State-of-Health Reliability of Flexible Li-Ion Batteries Under Dynamic Flexing and Calendar Aging". In ASME 2022 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/ipack2022-97431.
Abstract (sommario):
Abstract Wearable electronics have garnered much attention owing to benefits such as closer integration of form with function, flexibility, and light-weighting. Power sources used with FHE may be subject to dynamic flexing in addition to flex-to-install during the usage life of the product. While thick block batteries have been studied extensively in prior research — the impact of stresses of daily motion on the state of health degradation of thin-flexible batteries in conjunction with the use parameters is not well understood. Use conditions, including storage duration, operating temperature, flexing frequency, interval, and flex radius, might vary. Machine learning (ML) methods are needed prediction of state-of-health (SOH) degradation of the battery in various environmental conditions. It is not cost-effective to measure battery response in every condition, while the ANN ML might be able to assess conditions not previously measured. In this regard, it is expected that the ANN might be able to train the simulation. In this study, the simulation of SOH degradation on charging/discharging the flexible battery in dynamic folding, twisting and static folding with a calendar-aged battery in high temperature have been conducted. Accordingly, the ANN ML model has been trained with the simulation datasets to substitute the simulation. The generated data will be used for cross-validation of ML model and simulation for the battery life prediction. There is an expectation that such a combined method for data analysis might be helpful for time efficiency and cost reduction of research.
3
Lall, Pradeep, Ved Soni e Scott Miller. "Life-Assessment for Thin Flexible Batteries Under U-Flex-to-Install and Dynamic Folding". In ASME 2021 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/ipack2021-74115.
Abstract (sommario):
Abstract The growing need for wearable devices, fitness accessories and biomedical equipment has led to the upsurge in research and development of thin flexible battery research and development. The current state of art wearable electronics products being developed in several fields require installation of power sources in different configurations and at times require the battery to undergo mechanical folding during product operation. This requires the product batteries to robustly withstand the imposed mechanical stresses during use along with the other desirable characteristics attributed to the power source such as high C-rate capability, high capacity and low capacity degradation rate. Works that explore the effects of static and dynamic folding on li-ion power sources is limited and oftentimes doesn’t adhere to definite test protocols resulting in non-standardized experimental data that can’t be applied to real-life product scenarios. Specifically, the effect of fold diameter on the battery state of health degradation when subjected to both static and dynamic folding is not yet completely explored. Present study aims to address this gap in the literature by investigating the effect of varying the fold diameter is both static (U-flex-to-install) and dynamic (dynamic U-fold) tests. Four different values of fold diameters have been chosen for experimentation and to study its effect during the aforementioned tests. Multiple samples have been tested for a given test condition so as to generate high fidelity data. Ultimately, a regression model developed previously has been augmented with the results generated in the current study.
4
King, Peter, Elie Merlière, Clément Gosteli, Iñigo Martin Coto, Jack Reed, Mark Tucker, Mounia Karim e Heather Almond. "Design of a low-cost high-flux solar simulator". In THE INTERNATIONAL CONFERENCE ON BATTERY FOR RENEWABLE ENERGY AND ELECTRIC VEHICLES (ICB-REV) 2022. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0148835.
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Liu, Chen, Shengdun Zhao, Peng Dong e Peng Zhang. "Research on Flywheel Battery With Flux Switching Permanent Magnet Motor and its Application on Servo Press". In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11044.
Abstract (sommario):
Abstract Servo press is a manufacturing machine that usually works under impact loads. Flywheel battery is an energy storage device that has been widely studied in recent years. In this paper, a flywheel battery system for servo press energy compensation was put forward. In considering the efficiency and structure robustness, the flux switching permanent magnet (FSPM) motor is appropriate for flywheel battery as energy conversion device. In this study, the flywheel battery structure and working principle were first described. Then the motor characters were analyzed by FEM. After that, a simply initiative power control strategy was introduced for the flywheel battery. Finally, the prototype of flywheel battery with FSPM motor was made and connected to a servo press’s motor driver. The experiments were taken with and without the flywheel battery respectively. The experiment results proved that the flywheel battery could compensate a certain of DC link voltage loss during the press stamping process. That makes the servo press’s driven motor has a more stable power source and reduces the electrical shock to other equipment. In conclusion, the flywheel battery with FSPM motor is an effective energy storage system for servo press. It is believed that with the miniaturization and simplification of flywheel battery, the flywheel battery will be more general in impact load devices.
6
Lall, Pradeep, Ved Soni, Jinesh Narangaparambil, Hyesoo Jang e Scott Miller. "Life Prediction of Thin Flexible Batteries under U-Flex-to-Install, Dynamic Folding, Dynamic Twisting and Battery Lamination". In 2021 IEEE 71st Electronic Components and Technology Conference (ECTC). IEEE, 2021. http://dx.doi.org/10.1109/ectc32696.2021.00216.
7
Hartono, Hartono, Lantip Pramono, Niko Arfana Usti, Alief Maulana e Yusraini Muharni. "Coreless generator permanent magnet axial flux 500-watt design for wind turbine". In THE INTERNATIONAL CONFERENCE ON BATTERY FOR RENEWABLE ENERGY AND ELECTRIC VEHICLES (ICB-REV) 2022. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0174829.
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Liu, Yuanzhi, Mao Li e Jie Zhang. "An Experimental Parametric Study of Air-Based Battery Thermal Management System for Electric Vehicles". In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67841.
Abstract (sommario):
This paper develops an experimental platform and performs a parametric study of an air-based battery thermal management system (BTMS) for electric vehicles. A flexible experimental platform with ten battery cells is built up to investigate how key BTMS design parameters affect the battery thermal performance. Three design parameters are studied in this paper, including the mass flow rate of cooling air, the heat flux from the battery cells to the cooling air, and the passage spacing size. To evaluate the thermal performance of the battery system, two metrics (i.e., the maximum temperature rise and the maximum temperature Uniformity) are used. A design of experiments (here 30 groups) are conducted to analyze how the three key design parameters affect the thermal performance of the BTMS. A computational fluid dynamics (CFD) of the BTMS is also performed to compare and help explain the experimental results. Both the experimental and CFD simulation results shows that: (i) decreasing the mass flow rate may deteriorate the thermal performance of the battery module; (ii) increasing the heat flux and enlarging the passage spacing size also deteriorate the battery thermal performance.
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Romba Jorge, Luis F., Stanimir S. Valtchev e Rui Melicio. "Improving magnetic coupling for battery charging through 3D magnetic flux". In 2016 IEEE International Power Electronics and Motion Control Conference (PEMC). IEEE, 2016. http://dx.doi.org/10.1109/epepemc.2016.7752013.
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Jing, Junchao, Weishan Huang, Yiqiang Liu, Zhengxing Dai e Junzhi Zhang. "Research on Motor Control and Application in Dual Motor Hybrid System". In WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2024. http://dx.doi.org/10.4271/2024-01-2220.
Abstract (sommario):
<div class="section abstract"><div class="htmlview paragraph">This paper analyzes the current control, mode control and boost strategy of permanent magnet synchronous motor in dual hybrid system, which has good stability and robustness. Current control includes current vector control, MTPA control, flux weakening control, PI current control and SVPWM control. Motor mode includes initialization mode, normal mode, fault mode, active discharge mode, power off mode, battery heating mode and boost mode. The boost strategy of the hybrid system is based on boost mode management, boost target voltage determination and boost PI control. The specific content is as follows: Boost mode control. Boost mode includes initial mode, normal mode, off mode and fault mode. Boost target voltage is determined. Boost converter is controlled by variable voltage, which depends on the operation status of the motor and generator.. In order to improve the overall performance of the voltage control strategy, the voltage control strategy of the boost converter is dynamically adjusted by feeding the motor running state to the converter in real time, and the bus voltage is optimized. The motor application of the FOC strategy in the hybrid power system is the battery thermal control. The specific content is as follows: SVPWM control. SVPWM is based on the ideal flux loop of the three-phase symmetric motor stator powered by the three-phase symmetric sinusoidal wave as the reference standard, and the appropriate switching is carried out with different switching modes of the three-phase inverter, so as to form PWM waves and form actual flux vectors to track their accurate flux loops. Pulse thermal control. By applying the reactive voltage with high frequency changes and adopting the FOC control strategy, the inductive characteristics of the motor winding are constantly used to generate AC current on the bus. The high internal resistance of the battery at low temperature is used to constantly generate Joule heat on the battery. While avoiding the risk of lithium analysis on the battery, the battery itself will generate heat, thus increasing the temperature of the battery. Finally, the real vehicle test is carried out to verify the correctness of the motor control design.</div></div>
Rapporti di organizzazioni sul tema "Batterie a flux":
1
Zhang, Sai, Hongbing Jiang, Zhegang Ma, Hongbin Zhang, Jooyoung Park, Tao Liu, Thomas Ulrich e Ronald Boring PhD. Risk-Informed Analysis for Enhanced Resilient Nuclear Power Plant with Initiatives including ATF, FLEX, and Advanced Battery Technology. Office of Scientific and Technical Information (OSTI), settembre 2021. http://dx.doi.org/10.2172/1885798.
2
Nestleroth. L52298 Augmenting MFL Tools With Sensors that Assess Coating Condition. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), marzo 2009. http://dx.doi.org/10.55274/r0010396.
Abstract (sommario):
External coatings are routinely used to protect transmission pipelines from corrosion; however, coatings may degrade or disbond over time enabling corrosion to occur. Transmission pipeline operators often use magnetic flux leakage (MFL) in-line inspection tools to detect metal loss corrosion defects. Rather than finding the cause of a problem, failure of the coating within a corrosive environment, MFL corrosion surveys only find the result of the problem, corrosion defects that may permanently alter the pressure carrying capacity of the pipeline. Stress corrosion cracking (SCC) can be detected using in-line inspection (ILI) technology, but the availability of tools is limited and the cost of inspection is high compared to MFL inspection. SCC almost always occurs at coating faults; direct coating assessment could indicate future problems that could degrade the serviceability of the pipeline. In this project, a new sensor was developed to assess external coating that could work with currently available ILI tools for minimal additional cost to perform the inspection. The sensors, electromagnetic acoustic transducers (EMATs), generate ultrasonic waves that are guided by the pipe material around the circumference of the pipe. The coating material and adherence can influence the propagation of the ultrasonic waves; changes in ultrasonic signal features were attributed to coating faults. This development used modeling and experiments to establish a more optimal configuration for coating assessment. A multiple feature approach was used. A commonly used feature, signal amplitude, provided good sensitivity to coating condition but was influenced by inspection variables. One unique feature identified in this development is arrival time of the ultrasonic wave. For the wave type and frequency selected, the wave velocity was different for bare and coated pipe. Therefore, disbonded or missing coating can be detected by monitoring arrival time of the ultrasonic wave, a feature that is amplitude independent. Another feature for assessing coating, absorption of selective frequencies, was also demonstrated. Coating assessment capability was experimentally demonstrated using a prototype EMAT ILI tool. All three detection features were shown to perform well in an ILI environment as demonstrated at Battelle"s Pipeline Simulation Facility and BJ Inspection Services pull rigs. Improvement to the prototype occurred between each test; the most significant improvement was the design and construction of a novel set of thick-trace transmitting and receiving Printed Circuit Board (PCB) EMAT coils. Implementation variables such as moisture and soil loading were shown to have a minimal influence on results.