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An insight to the degradation behaviour of the parallel connected lithium-ion battery cells
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Al-Amin, Mohammad, Barai, Anup, Ashwin, T. R. and Marco, James (2021) An insight to the degradation behaviour of the parallel connected lithium-ion battery cells. Energies, 14 . 4716. doi:10.3390/en14164716
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Official URL: https://doi.org/10.3390/en14164716
Abstract
In an electric vehicle, a large number of lithium-ion cells are connected in parallel. While cells in parallel increase the reliability of the battery pack, it increases the probability of current imbalance between the parallel branches, thus ageing gradient. The current peak in a cell also can exceed the maximum charge current capability of the cell; leading to lithium plating, therefore a safety issue. The temperature gradient within a battery pack amplifies this issue. This work reports the impact of such temperature gradient on current imbalance within parallel connected cells, their long-term impact on degradation and evaluation of current distribution with degradation. Employing a real-world relevant experimental setup, a total of 1400 cycles were performed on a module with four cells in parallel. A temperature gradient of 10 °C was introduced among the cells, and current in individual parallel branches was measured employing Hall-effect sensors. Over the course of the experiment, module capacity decreased by 23.6%. Cells at higher temperature/lower exposure to active cooling experienced higher degradation. However, the cell with the lowest starting capacity, although exposed to nominal module temperature and cooling experienced the highest current amplitude towards the end of discharge/charge and thus the highest resistance degradation. It was found that current in an individual parallel branch was exceeding the maximum rated charge/discharge current by 53%. View Full-Text
| Item Type: | Journal Article | ||||||
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| Subjects: | Q Science > Q Science (General) T Technology > T Technology (General) T Technology > TJ Mechanical engineering and machinery T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||||
| Library of Congress Subject Headings (LCSH): | Lithium ion batteries, Lithium ion batteries -- Deterioration, Lithium ion batteries -- Temperature control, Battery management systems | ||||||
| Journal or Publication Title: | Energies | ||||||
| Publisher: | M.D.P.I.A.G. | ||||||
| ISSN: | 1996-1073 | ||||||
| Official Date: | 4 August 2021 | ||||||
| Dates: |
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| Volume: | 14 | ||||||
| Article Number: | 4716 | ||||||
| DOI: | 10.3390/en14164716 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access | ||||||
| Copyright Holders: | Authors | ||||||
| RIOXX Funder/Project Grant: |
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