Abstract: To improve the efficiency of the back end of the body, after the battery pack area reduce collision kinetic energy, reduce the impact on the battery pack, first using Ansa body structure finite element mesh modeling, and then by LS-DYNA light hybrid vehicle collision of finite element simulation calculation, finally study the plastic deformation of rear end parts process. At the same time, the structure of the rear end area of the vehicle body is appropriately optimized to make the deformation mode of this area more reasonable and reliable. Then, the rear collision performance meets the requirements of the relevant regulations.

Key words: Light hybrid vehicle; Post-touch finite element analysis; Battery pack; Structural optimization

摘要： 为提高车身后端的吸能效率，在电池包之后的区域消减掉碰撞动能，减小碰撞对电池 包的冲击，首先利用 Ansa 进行车身结构有限元网格划分建模，然后再通过 LS-DYNA 进行轻 混汽车后碰撞有限元仿真计算，最后分析研究车身后端部件的塑性变形过程。同时对车身后 端区域的结构进行适当优化，使该区域变形模式更加合理可靠，进而使后碰撞性能达到相关 法规的要求。

关键词: 轻混汽车；后碰有限元分析；电池包；结构优化