Thermal Design for the Pouch-Type Large-Format Lithium-Ion Batteries I. Thermo-Electrical Modeling and Origins of Temperature Non-Uniformity

By Bin Wu, Zhe Li, Jianbo Zhang. 2015

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Thispaperpresentsamulti-dimensionalthermo-electricalmodelforpouch-typelarge-formatlithium-ionbatterieswithhighaccuracybothspatiallyandtemporally.Themodelincludesatwo-dimensionalelectricalmodeltocalculatethecurrentdensityoverthe currentcollectorandathree-dimensionalthermalmodeltocalculatethetemperatureinthebatterycore.Toimprovetheaccuracy,keyparametersaredeterminedfromcarefullydesignedexperiments,ratherthantakingfromtheliterature.Thermalparameters areestimatedusingajointexperimentalandcomputationalmethod.Electricalcontactresistancebetweenthecableandthetabisestimatedfromaself-heatingexperiment.Withthereliableinputparameters,thepredictedtemperatureevolutionatmultiple locationsonthecellsurfaceagreeswellwiththemeasuredresults,indicatinghighaccuracyofthemodel.Usingthevalidatedmodel,sensitivityanalysisisconductedtoevaluatetherelativeimportanceofthermalparametersonbatterythermalperformance. Itisfoundthatthespeciﬁcheatcapacityhasthegreatestinﬂuenceonthemaximumtemperaturerise,whilethein-planethermalconductivityhasthegreatestinﬂuenceonthemaximumtemperaturevariation.Itiselucidatedthatthemaincauseforthetemperature non-uniformityistheheatﬂuxfromthetab,ratherthanthenon-uniformityofheatgenerationrateinthecore.©TheAuthor

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/d3b3a87649d7dd8a47f4f36079c31029ce9fd367