Rajan, Ashwin T., McGordon, Andrew and Jennings, P. A. (Paul A.) (2017) Electrochemical modelling of Li-ion battery pack with constant voltage cycling. Journal of Power Sources, 341 . pp. 327-339. doi:10.1016/j.jpowsour.2016.11.092 ISSN 0378-7753.

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Abstract

In a battery pack, cell-to-cell chemical variation, or the variation in operating conditions, can possibly lead to current imbalance which can accelerate pack ageing. In this paper, the Pseudo-TwoDimensional(P2D) porous electrode model is extended to a battery pack layout, to predict the overall behaviour and the cell-to-cell variation under constant voltage charging and discharging. The algorithm used in this model offers the flexibility in extending the layout to any number of cells in a pack, which can be of different capacities, chemical characteristics and physical dimensions. The coupled electrothermal effects such as differential cell ageing, temperature variation, porosity change and their effects on the performance of the pack, can be predicted using this modelling algorithm. The pack charging voltage is found to have an impact on the performance as well as the SEI layer growth. Numerical studies are conducted by keeping the cells at different thermal conditions and the results show the necessity to increase the heat transfer coefficient to cool the pack, compared to single cell. The results show that the thermal imbalance has more impact than the change in inter-connecting resistance on the split current distribution, which accelerates the irreversible porous filling and ageing.

Item Type:	Journal Article
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science, Engineering and Medicine > Science > Centre for Scientific Computing Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH):	Electric batteries -- Electrodes
Journal or Publication Title:	Journal of Power Sources
Publisher:	Elsevier S.A.
ISSN:	0378-7753
Official Date:	15 January 2017
Dates:	Date Event 15 January 2017 Published 25 November 2016 Accepted 29 September 2016 Submitted
Volume:	341
Page Range:	pp. 327-339
DOI:	10.1016/j.jpowsour.2016.11.092
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	19 December 2016
Date of first compliant Open Access:	19 December 2016
Funder:	Innovate UK, High Value Manufacturing Catapult, Jaguar Land Rover (Firm), Tata Motors

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