关键词: 轻量化, 电池盒, 复合材料, 刚度分析, 有限元分析

Abstract: In order to reduce the qualities of electric vehicles， the bearing characteristics of electric vehicle battery boxes were analyzed， based on the design method of rigidity equivalent， composite materials were used instead of metal materials based on the design method of rigidity equivalent.The laminated structure of the battery boxes was constructed by the theory of laminated structures of composite materials， the mechanics equations of equivalent stiffness and optimization functions were established and the structure parameters of the battery-boxes were determined.In order to verify the effectiveness of lightweight， the combination method of theoretical analysis and finite element numerical analysis was used， and the stiffnesses and deformations of metal materials and composite materials were compared.The results show that the method of equivalent stiffness is a convenience method for lightweight design of auto parts， and this method also provide references to the lightweight design for plate type parts of bearing structures.

Key words: lightweight, battery box, composite material, stiffness analysis, finite element analysis