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Large format lithium ion pouch cell full thermal characterisation for improved electric vehicle thermal management
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Grandjean, Thomas R. B., Barai, Anup, Hosseinzadeh, Elham, Guo, Yue, McGordon, Andrew and Marco, James (2017) Large format lithium ion pouch cell full thermal characterisation for improved electric vehicle thermal management. Journal of Power Sources, 359 . pp. 215-225. doi:10.1016/j.jpowsour.2017.05.016
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Official URL: http://dx.doi.org/10.1016/j.jpowsour.2017.05.016
Abstract
It is crucial to maintain temperature homogeneity in lithium ion batteries in order to prevent adverse voltage distributions and differential ageing within the cell. As such, the thermal behaviour of a large-format 20 Ah lithium iron phosphate pouch cell is investigated over a wide range of ambient temperatures and C rates during both charging and discharging. Whilst previous studies have only considered one surface, this article presents experimental results, which characterise both surfaces of the cell exposed to similar thermal media and boundary conditions, allowing for thermal gradients in-plane and perpendicular to the stack to be quantified. Temperature gradients, caused by self-heating, are found to increase with increasing C rate and decreasing temperature to such an extent that 13.4 ± 0.7% capacity can be extracted using a 10C discharge compared to a 0.5C discharge, both at −10 °C ambient temperature. The former condition causes an 18.8 ± 1.1 °C in plane gradient and a 19.7 ± 0.8 °C thermal gradient perpendicular to the stack, which results in large current density distributions and local state of charge differences within the cell. The implications of these thermal and electrical inhomogeneities on ageing and battery pack design for the automotive industry are discussed.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||||||
| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
| Library of Congress Subject Headings (LCSH): | Lithium ion batteries -- Thermal properties | ||||||||
| Journal or Publication Title: | Journal of Power Sources | ||||||||
| Publisher: | Elsevier S.A. | ||||||||
| ISSN: | 0378-7753 | ||||||||
| Official Date: | 15 August 2017 | ||||||||
| Dates: |
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| Date of first compliant deposit: | 30 May 2017 | ||||||||
| Volume: | 359 | ||||||||
| Page Range: | pp. 215-225 | ||||||||
| DOI: | 10.1016/j.jpowsour.2017.05.016 | ||||||||
| 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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