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Unballanced performance of parallel connected large format lithium ion batteries for electric vehicle application
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Hosseinzadeh, Elham, Odio, Maria Ximena, Marco, James and Jennings, Paul. A. (2019) Unballanced performance of parallel connected large format lithium ion batteries for electric vehicle application. In: SEST 2019 - 2nd International Conference on Smart Energy Systems and Technologies, Porto, Portugal, 9-11 Sep 2019. Published in: 2019 International Conference on Smart Energy Systems and Technologies (SEST) ISBN 9781728111568. doi:10.1109/SEST.2019.8849060
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WRAP-unballanced-performance-parallel-connected-large-format-lithium-ion-batteries-electric-vehicle-application-Hosseinzadeh-2019.pdf - Accepted Version - Requires a PDF viewer. Download (1250Kb) | Preview |
Official URL: https://doi.org/10.1109/SEST.2019.8849060
Abstract
The integration of cells that exhibit differing electrical characteristics, such as variations in energy capacity and internal resistance can degrade the overall performance of the energy storage system (ESS) when those cells are aggregated into single battery pack. When cells are connected electrically in parallel, such variations can lead to significant individual differences in battery load current, state of charge (SOC) and heat generation. Further, if consideration is given to small variations in cell interconnection resistance, the detrimental effect on load imbalance is amplified. Given that cell resistance is known to be a function of both SOC and temperature, the impact of the imbalance is compounded as the performance of cells further diverge under load. During extended periods of excitation, variations in cell depth of discharge (DOD) and the occurrence of temperature gradients across the parallel connection will accelerate cell ageing and, if unmanaged, may present safety concerns such as the onset of thermal runaway. In this paper the impact of varied SOC and temperature on the overall performance of the ESS with parallel connected cells has been investigated. The results highlight that 8% variation in the initial SOC can result in a current difference of 62% among the cells, while a temperature variation of 8℃ results in a current deviation of 14%. Moreover, it was found that the interconnection resistance can significantly increase the inhomogeneity.
Item Type: | Conference Item (Paper) | ||||||||||||
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Subjects: | T Technology > TJ Mechanical engineering and machinery T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||||
Library of Congress Subject Headings (LCSH): | Lithium ion batteries, Electric automobiles -- Batteries, Storage batteries | ||||||||||||
Journal or Publication Title: | 2019 International Conference on Smart Energy Systems and Technologies (SEST) | ||||||||||||
Publisher: | IEEE | ||||||||||||
ISBN: | 9781728111568 | ||||||||||||
Official Date: | 26 September 2019 | ||||||||||||
Dates: |
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DOI: | 10.1109/SEST.2019.8849060 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Reuse Statement (publisher, data, author rights): | © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. | ||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
Copyright Holders: | University of Warwick | ||||||||||||
Date of first compliant deposit: | 30 September 2019 | ||||||||||||
Date of first compliant Open Access: | 2 October 2019 | ||||||||||||
RIOXX Funder/Project Grant: |
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Conference Paper Type: | Paper | ||||||||||||
Title of Event: | SEST 2019 - 2nd International Conference on Smart Energy Systems and Technologies | ||||||||||||
Type of Event: | Conference | ||||||||||||
Location of Event: | Porto, Portugal | ||||||||||||
Date(s) of Event: | 9-11 Sep 2019 | ||||||||||||
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