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
刘南南 1张新春 2董思捷 1汪玉林 1尹啸笛 1张涛1
作者信息
- 1. 华北电力大学机械工程系,071003保定
- 2. 华北电力大学机械工程系,071003保定;河北省电力机械装备健康维护与失效预防重点实验室,071003保定
- 折叠
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.
Abstract
In order to realize the requirements of safety protection design of power battery under mechani-cal 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 lithi-um-ion battery are carried out,and the extrusion mechanical response and internal structure failure mecha-nism 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 com-pression 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 un-der 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Key words
square lithium-ion battery/compression loadings/mechanical response/failure mechanism引用本文复制引用
基金项目
河北省自然科学基金项目(A2020502005)
中央高校基本科研业务费专项资金资助项目(2020MS113)
出版年
2024
NETL
NSTL
万方数据