动力电池包安装在电动汽车的底部，离地间隙通常只有十几厘米，底部容易磕碰导致电池包起火。为兼顾轻量化与防护性能要求，本文选用聚丙烯加玻纤（PPA）、芳纶、泡沫铝板等几种可以作为电池包底板的新型材料进行研究。对材料进行板材级挤压测试，根据试验结果对仿真模型进行修正，得到力学参数。进行整包的底部球击测试，得到不同材料的电芯侵入量和变形模式。仿真和测试结果表明，8 mm PPA复合材料（8 mm为厚度）的电芯侵入量最小，且质量相对较轻，满足性能要求。此研究对电池包的底部防护设计提供了参考，具有工程借鉴意义。

The power battery pack is installed at the bottom of the electric vehicle,and the ground clearance is usually only a dozen centimeters.The bottom is easy to bump and cause the battery pack to catch fire.In order to balance the requirements of lightweight and protective performance,several new materials such as polyphthalimide (PPA),amide-fiber and foamed aluminum plate are selected for research.The material was tested by sheet level extrusion,and the simulation model wes modified according to the test results to obtain the mechanical parameters.The bottom ball strike test of the whole package was carried out to obtain the cell intrusion amount and deformation mode of different materials.The simulation and test results show that the 8 mm PPA composite material (8 mm thick) has the smallest cell intrusion and less weight,which met the performance requirements.This research provided a reference for the bottom protection design of the battery pack and had engineering reference significance.