关键词: 动力电池包；模态分析；扫频测试；阻尼系数

Abstract: The battery pack is difficult to analyze mechanical performance due to its complex mechanical, electrical, thermal and other components system, which brings great challenges to the subsequent benchmark. Therefore, it is particularly important to chose a reasonable modeling method. This paper uses the homogenized model equivalent method and fine pre-treatment, combined with the isotropic material performance data obtained by compression test method, to carry out modal simulation of the battery system and its zero parts respectively. Based on the sweep frequency test data, the validity and accuracy of the model are verified. The material data of the cell and the supporting foam is verified by the test and simulation benchmark. By comparing the sweep frequency test data with or without the foam and with or without the box cover, the influence law of the box cover and the supporting foam on the system stiffness is obtained, and the influence factors and reasons of the differences in the sweep frequency curves of several states are explained.

Key words: Power battery pack; Modal analysis; Sweep frequency test; Damping coefficient