Large format lithium ion pouch cell full thermal characterisation for improved electric vehicle thermal management

Thomas Grandjean, Anup Barai, Elham Hosseinzadeh, Yue Guo, Andrew McGordon, James Marco

    Research output: Contribution to journalArticlepeer-review

    44 Citations (Scopus)

    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.

    Original languageEnglish
    Pages (from-to)215-225
    Number of pages11
    JournalJournal of Power Sources
    Volume359
    Early online date26 May 2017
    DOIs
    Publication statusPublished - 15 Aug 2017

    Keywords

    • Battery thermal management system
    • Lithium ion
    • Temperature gradient
    • Thermal characterisation
    • Thermal management

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • Energy Engineering and Power Technology
    • Physical and Theoretical Chemistry
    • Electrical and Electronic Engineering

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