超高强钢制电池包底部球击试验与仿真方法研究

目的 研究超高强钢电池包底部球击工况的仿真分析方法，通过实物试验验证仿真分析方法的准确性。方法 通过建立电池包底部球击的仿真模型，对底部球击工况进行数值模拟，分析球击过程中应力–应变分布和底板承受变形的能量情况。开展底部球击实物试验，并与模拟结果进行对比分析。结果 在球击过程中，随着球击头撞击底板位移的增大，挤压力逐渐增加，底板变形能量也逐渐增加;当挤压力达到10 kN时，仿真位移为19.127 mm，试验结果位移为20 mm。当位移达到20 mm时，仿真底板变形能量为73.716 J，试验结果为70.581 J，仿真与试验结果较为一致。结论 超高强钢电池包在底部球击试验中未发生开裂，满足标准要求，数值模拟方法可以为电池包底部球击工况提供指导。

Ball Impact Test and Simulation Method at the Bottom of Ultra-high Strength Steel Battery Pack

The paper aims to study the simulation analysis method of ball impact condition at the bottom of ultra-high strength steel battery pack and verify the accuracy of the simulation analysis method by physical test comparison. By establishing the simulation model of the bottom ball impact of the battery pack, the working condition of the bottom ball impact is simulated. The distribution of stress and strain and the deformation energy of the base plate during the process of ball striking are analyzed. The physical test of bottom ball impact is carried out and compared with the simulation results. In the process of ball striking, with the increase of the displacement of the ball striking head hitting the bottom plate, the extrusion force increases gradually, and the deformation energy of the bottom plate also increases gradually. When the extrusion force reaches 10 kN, the simulation displacement is 19.127 mm and the test result displacement is 20 mm. When the displacement reaches 20 mm, the deformation energy of the simulated bottom plate is 73.716 J, and the test result is 70.581 J. The simulation results are consistent with the test results. The results show that the ultra-high strength steel battery pack does not crack in the bottom ball impact test, which meets the standard requirements. The simulation method can provide guidance for the bottom ball impact condition of the battery pack.