储能科学与技术2024，Vol.13Issue(10)：3518-3522,5.DOI:10.19799/j.cnki.2095-4239.2024.0392
锂离子电池材料准静态压缩本构模型
Quasi-static constitutive modeling of lithium-ion battery materials under compression
摘要
Abstract
In the lithium-ion battery energy storage systems,the cell experiences increased force fluctuations over prolonged cycles,which can impact cell lifespan and system reliability.Numerical simulation is an effective tool for predicting the stress state of the cell.By developing a constitutive model that accurately reflects the mechanical properties of the cell and applying it to numerical simulations,we can precisely predict the cell's stress state and provide valuable insights for engineering design.Uniaxial compression tests of the battery reveal distinct nonlinear plastic behavior during loading and nonlinear elastic behavior during unloading.This indicates that a single constitutive model is insufficient to accurately characterize the mechanical response of the cell during both loading and unloading processes.This paper employs two types of constitutive models to accurately represent the cell's behavior,the PE(porous elasticity)model for nonlinear elastic behavior and the CFP(crushable foam plasticity)model for nonlinear plasticity and strain hardening.By using these models,the material parameters from the stress-strain curve obtained from testing are inversed.The core of the cell is treated as a laminated composite,and the PE and CFP models,along with their respective material parameters,are alternately applied to develop the numerical model of the cell.A simulation model is established and numerically solved to match the conditions of the uniaxial compression test of the battery.The stress-strain curve data from the numerical simulation results are compared with the actual test results.The findings indicate that the modeling method accurately characterizes the mechanical behavior of the cell during both loading and unloading processes,with a degree of agreement that meets the requirements for engineering simulation applications.关键词
锂离子电池/本构模型/数值模拟/单轴压缩/膨胀力Key words
lithium ion battery/constitutive model/numerical simulation/uniaxial compression/expansion force分类
信息技术与安全科学引用本文复制引用
邱宇超,陈佰爽,陈诚,钱瑞鹏..锂离子电池材料准静态压缩本构模型[J].储能科学与技术,2024,13(10):3518-3522,5.基金项目
国家自然科学基金青年基金项目(52304094),国家重点研发计划课题(2023YFB4005505). （52304094）
