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

摘要： 电池包是一个包含机-电-热多部件的复杂综合体，开展机械性能分析较为困难，同时给 后续对标带来了较大挑战，因此合理建模方式显得尤为重要。文章采用均质化的模型等效方 法及精细的前处理，结合压缩试验方法获得的各向同性材料性能数据，对电池系统及其零部 件分别开展模态仿真，结合扫频测试数据，验证了模型的有效性和精度；通过试验与仿真的 对标验证了电芯与支撑泡棉的材料数据，对比有无泡棉和有无箱盖的扫频试验数据，获得了 箱盖和支撑泡棉对系统刚度的影响规律，并解释了几种状态扫频曲线差异性的影响因素及原 因。

关键词: 动力电池包；模态分析；扫频测试；阻尼系数