Impact of Individual Cell Parameter Difference on the Performance of Series–Parallel Battery Packs

[Image: see text] Lithium-ion power batteries are used in groups of series–parallel configurations. There are Ohmic resistance discrepancies, capacity disparities, and polarization differences between individual cells during discharge, preventing a single cell from reaching the lower limit of the te...

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Autores principales: Wang, Yongqi, Zhao, Yujie, Zhou, Siyuan, Yan, Qingzhong, Zhan, Han, Cheng, Yong, Yin, Wei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10034991/
https://www.ncbi.nlm.nih.gov/pubmed/36969441
http://dx.doi.org/10.1021/acsomega.3c00266
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author Wang, Yongqi
Zhao, Yujie
Zhou, Siyuan
Yan, Qingzhong
Zhan, Han
Cheng, Yong
Yin, Wei
author_facet Wang, Yongqi
Zhao, Yujie
Zhou, Siyuan
Yan, Qingzhong
Zhan, Han
Cheng, Yong
Yin, Wei
author_sort Wang, Yongqi
collection PubMed
description [Image: see text] Lithium-ion power batteries are used in groups of series–parallel configurations. There are Ohmic resistance discrepancies, capacity disparities, and polarization differences between individual cells during discharge, preventing a single cell from reaching the lower limit of the terminal voltage simultaneously, resulting in low capacity and energy utilization. The effect of the parameter difference (difference in parameters) of individual cells on the performance of the series–parallel battery pack is simulated and analyzed by grouping cells with different parameters. The findings reveal that when cells are connected in series, the capacity difference is a significant factor impacting the battery pack’s energy index, and the capacity difference and Ohmic resistance difference are significant variables affecting the battery pack’s power index. When cells are connected in parallel, the difference in Ohmic internal resistance between them causes branch current imbalance, low energy utilization in some individual cells, and a sharp expansion of unbalanced current at the end of discharge, which is prone to overdischarge and shortens battery life. Interestingly, we found that when there is an aging cell in a series–parallel battery pack, the terminal voltage of the single battery module containing the aging single cell will decrease sharply at the end of discharge. Evaluating the change rate of battery module terminal voltage at the end of discharge can be used as a method to evaluate the aging degree of the battery module. The research results provide a reference for connecting batteries to battery packs, particularly the screening of retired power battery packs and the way to reconnect into battery packs.
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spelling pubmed-100349912023-03-24 Impact of Individual Cell Parameter Difference on the Performance of Series–Parallel Battery Packs Wang, Yongqi Zhao, Yujie Zhou, Siyuan Yan, Qingzhong Zhan, Han Cheng, Yong Yin, Wei ACS Omega [Image: see text] Lithium-ion power batteries are used in groups of series–parallel configurations. There are Ohmic resistance discrepancies, capacity disparities, and polarization differences between individual cells during discharge, preventing a single cell from reaching the lower limit of the terminal voltage simultaneously, resulting in low capacity and energy utilization. The effect of the parameter difference (difference in parameters) of individual cells on the performance of the series–parallel battery pack is simulated and analyzed by grouping cells with different parameters. The findings reveal that when cells are connected in series, the capacity difference is a significant factor impacting the battery pack’s energy index, and the capacity difference and Ohmic resistance difference are significant variables affecting the battery pack’s power index. When cells are connected in parallel, the difference in Ohmic internal resistance between them causes branch current imbalance, low energy utilization in some individual cells, and a sharp expansion of unbalanced current at the end of discharge, which is prone to overdischarge and shortens battery life. Interestingly, we found that when there is an aging cell in a series–parallel battery pack, the terminal voltage of the single battery module containing the aging single cell will decrease sharply at the end of discharge. Evaluating the change rate of battery module terminal voltage at the end of discharge can be used as a method to evaluate the aging degree of the battery module. The research results provide a reference for connecting batteries to battery packs, particularly the screening of retired power battery packs and the way to reconnect into battery packs. American Chemical Society 2023-03-06 /pmc/articles/PMC10034991/ /pubmed/36969441 http://dx.doi.org/10.1021/acsomega.3c00266 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Wang, Yongqi
Zhao, Yujie
Zhou, Siyuan
Yan, Qingzhong
Zhan, Han
Cheng, Yong
Yin, Wei
Impact of Individual Cell Parameter Difference on the Performance of Series–Parallel Battery Packs
title Impact of Individual Cell Parameter Difference on the Performance of Series–Parallel Battery Packs
title_full Impact of Individual Cell Parameter Difference on the Performance of Series–Parallel Battery Packs
title_fullStr Impact of Individual Cell Parameter Difference on the Performance of Series–Parallel Battery Packs
title_full_unstemmed Impact of Individual Cell Parameter Difference on the Performance of Series–Parallel Battery Packs
title_short Impact of Individual Cell Parameter Difference on the Performance of Series–Parallel Battery Packs
title_sort impact of individual cell parameter difference on the performance of series–parallel battery packs
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10034991/
https://www.ncbi.nlm.nih.gov/pubmed/36969441
http://dx.doi.org/10.1021/acsomega.3c00266
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