不同挤压载荷下方形锂离子电池的力学响应特性研究  

Mechanical response of square lithium-ion battery under different compression loadings

作　　者：刘南南 张新春[1,2] 董思捷 汪玉林 尹啸笛 张涛 LIU Nannan;ZHANG Xinchun;DONG Sijie;WANG Yulin;YIN Xiaodi;ZHANG Tao(Department of Mechanical Engineering,North China Electric Power University,071003 Baoding,China;Hebei Key Laboratory of Electric Machinery Health Maintenance&Failure Prevention,071003 Baoding,China)

机构地区：[1]华北电力大学机械工程系,保定071003 [2]河北省电力机械装备健康维护与失效预防重点实验室,保定071003

出　　处：《应用力学学报》2024年第4期797-803,共7页Chinese Journal of Applied Mechanics

基　　金：河北省自然科学基金项目(No.A2020502005);中央高校基本科研业务费专项资金资助项目(No.2020MS113)。

摘　　要：为实现动力电池在机械载荷下安全防护设计的要求,对不同挤压载荷下方形锂离子电池的力学响应特性进行了研究。首先,对方形锂离子电池进行平面压缩和局部压痕试验,给出了电池的挤压力学响应和内部结构的失效机制;其次,建立方形锂离子电池的有限元模型,研究了不同挤压载荷下电池的力-位移曲线,讨论了不同挤压形式对锂离子电池力学响应的影响。研究结果表明:有限元分析结果与试验结果基本吻合,平面压缩将导致电池内部出现拉伸引起的面内断裂模式,而局部压痕将导致剪切引起的层间断裂模式;锂离子电池在不同挤压载荷下的力学响应受压头尺寸的影响,随着压头尺寸的减小,电池承受的载荷和失效位移会有不同程度减小。In order to realize the requirements of safety protection design of power battery under mechanical abuse,the mechanical response characteristics of square lithium-ion battery under different extrusion loadings were studied in this paper.First,the plane compression and local indentation tests of square lithium-ion battery are carried out,and the extrusion mechanical response and internal structure failure mechanism of the battery are given.Then,the finite element model of square lithium-ion battery is established,the force displacement curves of the battery under different extrusion loads are studied,and the effects of different extrusion forms on the mechanical response of lithium-ion battery are discussed.The results show that the finite element analysis results are basically consistent with the experimental results.Plane compression will lead to in-plane fracture mode caused by tension inside the battery,while local indentation will lead to interlaminar fracture mode caused by shear.The mechanical response of lithium-ion battery under different extrusion loads is affected by the size of compression head.With the decrease of the indenter size,the load and failure displacement of the battery will decrease differently.

关 键 词：方形锂离子电池 挤压载荷 力学响应 失效机理 

分 类 号：TM912.9[电气工程—电力电子与电力传动]