Multi-Scale and Multi-Dimensional Thermal Modeling of Lithium-Ion Batteries

Geonhui Gwak and Hyunchul Ju
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Geonhui Gwak: Department of Mechanical Engineering, Inha University, 100 Inha-ro Michuhol-Gu, Incheon 22212, Korea
Hyunchul Ju: Department of Mechanical Engineering, Inha University, 100 Inha-ro Michuhol-Gu, Incheon 22212, Korea

Energies, 2019, vol. 12, issue 3, 1-27

Abstract: In this study, we present a three-dimensional (3-D), multi-scale, multi-physics lithium-ion battery (LIB) model wherein a microscale spherical particle model is applied to an electrode particle domain and a comprehensive 3-D continuum model is applied to a single cell domain consisting of current collectors, porous electrodes, and a separator. Particular emphasis is placed on capturing the phase transition process inside the lithium iron phosphate (LFP) particles that significantly influences the LIB charge and discharge behaviors. The model is first validated against the experimental data measured at various discharge rates. In general, the model predictions compare well with the experimental data and further highlight key electrochemical and transport phenomena occurring in LIBs. Besides elucidating the phase transition evolution inside LFP particles and location-specific heat generation mechanism, multi-dimensional contours of species concentration, temperature, and current density are analyzed under a 3-D cell configuration to provide valuable insight into the charge and discharge characteristics of LIBs. The present multi-scale LIB model can be applied to a realistic LIB geometry to search for the optimal design and operating conditions.

Keywords: lithium-ion battery; lithium iron phosphate; multi-scale modeling; phase-transition; numerical model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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