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Reference: Offer, GJ, Yufit, V, Howey, DA et al., (2012). Module design and fault diagnosis in electric vehicle batteries. Journal of Power Sources, 206, 383-392.Citable link to this page:

 

Module design and fault diagnosis in electric vehicle batteries

Abstract: Systems integration issues, such as electrical and thermal design and management of full battery packs - often containing hundreds of cells - have been rarely explored in the academic literature. In this paper we discuss the design and construction of a 9 kWh battery pack for a motorsports application. The pack contained 504 lithium cells arranged into 2 sidepods, each containing 3 modules, with each module in a 12P7S configuration. This paper focuses particularly on testing the full battery pack and diagnosing subsequent problems related to cells being connected in parallel. We demonstrate how a full vehicle test can be used to identify malfunctioning strings of cells for further investigation. After individual cell testing it was concluded that a single high inter-cell contact resistance was causing currents to flow unevenly within the pack, leading to cells being unequally worked. This is supported by a Matlab/Simulink model of one battery module, including contact resistances. Over time the unequal current flowing through cells can lead to significant differences in cells' state of charge and open circuit voltages, large currents flowing between cells even when the load is disconnected, cells discharging and aging more quickly than others, and jeopardise capacity and lifetime of the pack.

Peer Review status:Peer reviewedPublication status:PublishedVersion:Author's OriginalNotes:Copyright 2012 Elsevier Ltd. All rights reserved. This is a pre-print version of: Offer, G.J. et al., Module design and fault diagnosis in electric vehicle batteries. Journal of Power Sources, Volume 206, 15 May 2012, Pages 383-392, doi:10.1016/j.jpowsour.2012.01.087

Bibliographic Details

Publisher: Elsevier

Publisher Website: http://www.elsevier.com/

Journal: Journal of Power Sourcessee more from them

Publication Website: http://www.sciencedirect.com/science/journal/03787753/206/supp/C

Issue Date: 2012-5-15

pages:383-392Identifiers

Urn: uuid:bc1c1cb3-bbe9-44c9-8ac0-dd6cf2dd6293

Source identifier: 321038

Doi: https://doi.org/10.1016/j.jpowsour.2012.01.087

Issn: 0378-7753 Item Description

Type: Journal article;

Language: eng

Version: Author's OriginalKeywords: Battery management Battery pack Electric vehicle Fault finding Lithium battery Tiny URL: pubs:321038

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Autor: Offer, GJ - - - Yufit, V - - - Howey, DA - institutionUniversity of Oxford Oxford, MPLS, Engineering Science - - - Wu, B - - - Br

Fuente: https://ora.ox.ac.uk/objects/uuid:bc1c1cb3-bbe9-44c9-8ac0-dd6cf2dd6293



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