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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
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 | ||||||||||
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| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TL Motor vehicles. Aeronautics. Astronautics |
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| 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: |
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| 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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