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

Subjects: Mechanics >> Solid Mechanics submitted time 2024-08-13 Cooperative journals: 《应用力学学报》

LIU Nannan

Abstract：
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.

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