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The effect of external compressive loads on the cycle lifetime of lithium-ion pouch cells

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Barai, Anup, Tangirala, Ravichandra, Uddin, Kotub, Chevalier, Julie, Guo, Yue, McGordon, Andrew and Jennings, P. A. (Paul A.) (2017) The effect of external compressive loads on the cycle lifetime of lithium-ion pouch cells. Journal of Energy Storage, 13 . pp. 211-219. doi:10.1016/j.est.2017.07.021

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Official URL: https://doi.org/10.1016/j.est.2017.07.021

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Abstract

In application, lithium-ion pouch-format cells undergo expansion during cycling. To prevent contact loss between battery pack components and delamination and deformation during battery operation, compressive pressure is applied to cells in automotive battery modules/packs by way of rigid cell housing within the modules. In this paper, the impact of such compressive pressure on battery degradation is studied. Samples of commercial, 15 Ah LiNiMnCoO2/Graphite electrode pouch-type cells were cycled 1200 times under atmospheric, 5 psi and 15 psi compressive loads. After 1200 cycles, the capacity fade for 0, 5 and 15 psi loads was11.0%, 8.8% and 8.4%, respectively; the corresponding power fade was found to be 7.5%, 39% and 18%, respectively, indicating power fade peaks between 0 and 15psi. This contrasting behaviour is related to the wettability increase and separator creep within the cell after compressive load is applied. The opposing capacity fade and power fade results require consideration from automotive battery engineers at the design stage of modules and packs. In addition to capacity fade and power fade results, the study identified the evolution of compressive pressures over multiple cycles, showing that pressure increases with cycling.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Lithium ion batteries, Automobiles -- Batteries
Journal or Publication Title: Journal of Energy Storage
Publisher: Elsevier
ISSN: 2352-152X
Official Date: 1 October 2017
Dates:
DateEvent
1 October 2017Published
1 August 2017Available
24 July 2017Accepted
22 April 2017Submitted
Volume: 13
Page Range: pp. 211-219
DOI: 10.1016/j.est.2017.07.021
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Innovate UK, High Value Manufacturing Catapult, Jaguar Land Rover (Firm), Tata Motors

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