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Modelling and experimental evaluation of parallel connected lithium ion cells for an electric vehicle battery system

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Bruen, Thomas and Marco, James (2016) Modelling and experimental evaluation of parallel connected lithium ion cells for an electric vehicle battery system. Journal of Power Sources, 310 . pp. 91-101. doi:10.1016/j.jpowsour.2016.01.001

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Official URL: http://dx.doi.org/10.1016/j.jpowsour.2016.01.001

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Abstract

Highlights:

• Experimental evaluation of energy imbalance within parallel connected cells.
• A validated new method of combining equivalent circuit models in parallel.
• Interdependence of capacity, voltage and impedance for calculating cell currents.
• A 30% difference in impedance can result in a 60% difference in peak cell current.
• A difference of over 6% in charge throughput was observed during cycling.

Abstract:

Variations in cell properties are unavoidable and can be caused by manufacturing tolerances and usage conditions. As a result of this, cells connected in series may have different voltages and states of charge that limit the energy and power capability of the complete battery pack. Methods of removing this energy imbalance have been extensively reported within literature. However, there has been little discussion around the effect that such variation has when cells are connected electrically in parallel. This work aims to explore the impact of connecting cells, with varied properties, in parallel and the issues regarding energy imbalance and battery management that may arise. This has been achieved through analysing experimental data and a validated model. The main results from this study highlight that significant differences in current flow can occur between cells within a parallel stack that will affect how the cells age and the temperature distribution within the battery assembly.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Electric vehicles, Electric batteries, Lithium ion batteries, Electric circuits, Equivalent
Journal or Publication Title: Journal of Power Sources
Publisher: Elsevier S.A.
ISSN: 0378-7753
Official Date: 1 April 2016
Dates:
DateEvent
24 July 2015Submitted
17 November 2015Modified
1 January 2016Accepted
12 February 2016Available
1 April 2016Published
Volume: 310
Number of Pages: 12
Page Range: pp. 91-101
DOI: 10.1016/j.jpowsour.2016.01.001
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/I01585X/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
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