摘要
为了满足动力锂离子电池在机械滥用下安全运行的要求,利用实验和有限元模拟相结合的方法对不同挤压工况下锂离子电池的压缩响应特性和失效机理进行了研究。通过自行搭建的三维数字图像相关法监测平台,对18650圆柱形锂离子电池进行了挤压实验,给出了不同挤压工况(平面压缩、局部压痕和三点弯曲)下电池的力-电-热响应行为。基于COMSOL多物理场仿真软件建立了挤压载荷下圆柱形锂离子电池的多物理场耦合模型,具体讨论了加载方式对锂离子电池压缩响应的影响,并与实验结果进行了对比分析,二者吻合较好。研究结果表明,平面压痕和局部压缩工况下锂离子电池表现出一致的响应特性,承载力达到峰值后迅速下降;平面压缩工况下电池的峰值力大于局部压痕工况,随着荷电状态(SOC)的提高,电池的承载能力增强。本工作可为锂离子电池多功能设计和安全评估提供参考。
To meet the requirements of safety operation of lithium-ion batteries(LIBs)under mechanical abuse,a combined approach of experimental testing and finite element simulation was employed to investigate the deformation responses and failure mechanisms of LIBs under different compression conditions.A self-built three-dimensional digital image correlation platform was utilized to conduct compression experiments on 18650 cylindrical cells,and the mechanical-electro-thermal response behaviors of LIBs under various compression conditions were investigated,including plane compression,local indentation,and spherical indentation.Additionally,a multiphysics coupling model of cylindrical LIBs under compression loads was established using COMSOL Multiphysics.The influence of loading methods on the compression response of LIBs was discussed in detail,and the comparison of the simulated results with the experimental results showed good consistence.The research results indicate that consistent response characteristics are exhibited under plane compression and local compression conditions.The load-bearing capacity reaches its peak and then declines rapidly.Moreover,the peak force of the battery under plane compression is higher than that under local indentation,and the load-bearing capacity of the cell increases with the state of charge(SOC).This work offers valuable insights for the multifunctional design and safety assessment of LIBs.
作者
张涛
郑家豪
张新春
吴晓囡
黄子轩
尹啸笛
张晓翠
张英杰
ZHANG Tao;ZHENG Jiahao;ZHANG Xinchun;WU Xiaonan;HUANG Zixuan;YIN Xiaodi;ZHANG Xiaocui;ZHANG Yingjie(Hebei Key Laboratory of Electric Machinery Health Maintenance&Failure Prevention,North China Electric Power University,Baoding 071003,Hebei,China;Hebei Engineering Research Center for Advanced Manufacturing&Intelligent Operation and Maintenance of Electric Power Machinery,North China Electric Power University,Baoding 071003,Hebei,China;Tianjin Product Quality Inspection Technology Research Institute,Electrical Technology Science Research Center,Tianjin 300384,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第20期5-10,共6页
Materials Reports
基金
河北省自然科学基金(A2020502005)。
关键词
锂离子电池
挤压
力-电-热响应
电池失效
多物理场
lithium-ion battery
compression
mechanical-electro-thermal response
battery failure
multiphysics
