纯电动汽车铝合金电池箱结构优化设计

Optimization design of aluminum alloy battery box structure for battery electric vehicles

分别对动力电池组的箱体进行结构静力学分析、模态分析和振动试验分析.结果 显示:两种极限工况下,电池箱最大应力分别为26.739、70.128 MPa,均小于材料的屈服强度.模态分析时,电池箱的第一阶频率大于21 Hz,并且固有频率避开了33 Hz,振动试验分析显示,较大载荷下y方向的应力处于形变危险区域,X和Z方向上符合相关标准要求.根据仿真分析的结果对托架和盒体进行了合理结构优化.

The structural static analysis,modal analysis and vibration test analysis were carried out on the box of the power battery pack.The results show that under the two extreme conditions,the maximum stress of the battery box is 26.739 and 70.128 MPa,respectively,less than the yield strength of the material.In the modal analysis,the first--order frequency of the battery box is greater than 21 Hz,and the natural frequency avoids 33 Hz.The vibration test analysis shows that under high load,the stress in the Y direction is in a dangerous state,and the X and Z directions are in compliance with the relevant requirements.The structure of the bracket and the casing was optimized according to the results of the simulation analysis.