新能源汽车电池包箱体结构优化及底部碰撞研究

Structure Optimization and Bottom Collision Research of the Battery Pack for New Energy Vehicle

电池包箱体作为电池包的承载部件,它的结构设计对于提高电池包安全性能具有重要意义。以某款新能源汽车电池包为研究对象,建立电池包箱体有限元模型进行分析。电池包箱体结构变形量较大,前二阶固有频率相对较低,需要对电池包箱体结构进行优化设计。以提高一阶固有频率为优化目标,建立电池包箱体结构优化模型。电池包箱体经过结构优化设计后,前二阶固有频率分别提高到24.25Hz和34.3Hz,能够合理避开路面激励频率。利用Ansys软件对电池包下箱体进行碰撞分析。碰撞体的最大侵入量为0.818mm,远小于4.5mm,满足新能源汽车碰撞的安全要求。

As the carrier part of the battery pack,its structural design is of great importance for the improvement of the safety performance of the battery pack.A new energy vehicle battery pack as a research object,establishing the battery pack box finite element model for analyzing.The deformation of the battery pack box structure is large,and the first and second order intrinsic frequency of the battery pack box is relatively low,so it is necessary to optimize the design of the battery pack box structure.To improve the first-order intrinsic frequency as the optimization goal,the battery pack case structure optimization model is established.After structural optimization,the first and second order intrinsic frequencies of the battery pack case are increased to 24.25Hz and 34.3Hz respectively,which can reasonably avoid the excitation frequency of the road surface.Ansys software is used to analyze the collision of the lower box body of the battery pack.The maximum intrusion of the collision body is 0.818mm,which is much smaller than 4.5mm and meets the safety requirements of new energy vehicle collision.