不同挤压载荷下方形锂离子电池的力学响应特性研究

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.