4.5 Article

Modeling extreme deformations in lithium ion batteries

期刊

ETRANSPORTATION
卷 4, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.etran.2020.100065

关键词

Extreme deformation; Battery safety; Crashworthiness; Coupled mechanical-ElectroChemical-thermal models

资金

  1. Vehicle Technologies Office, Office of Energy Efficiency and Renewable Energy, U.S. Department of Energy [WBS.1.1.2.406]
  2. Department of Energy's Office of Energy Efficiency and Renewable Energy, located at the National Renewable Energy Laboratory

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A simultaneously coupled modeling approach to study the electrochemical and thermal behavior of lithium-ion batteries under large mechanical deformation has been developed. The thermo-electrochemical pseudo-2D (P2D) battery model is coupled with a mechanical material model. Mechanical, thermal, and electrochemical models are implemented as user-defined sub-routines in the commercial multi-physics code LS-DYNA. The mechanical strain experienced by anode, cathode and separator results in thickness and porosity changes in each layer which in turn influences electrochemical behavior. The evolution of concentration profiles and cell potential are studied under different mechanical loading conditions. Internal short-circuits caused by mechanical deformation and corresponding physical behaviors are also elucidated. We discuss the competing effects of improved transport at higher temperature due to the internal short-circuit versus a drop in the effective ionic conductivity and electrolyte diffusivity due to mechanical deformation. Published by Elsevier B.V.

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