电动汽车轻质复合材料电池架设计与研究

Study on lightweight and compound material structure of a electric car battery holder

建立电动汽车电池架有限元模型,计算电池架在颠簸、紧急制动与转弯等典型工况下应力、变形分布情况,通过约束模态分析得到电池架前6阶固有频率。提出了几种电池架结构设计,采用复合材料对电池架进行轻质化设计。验证结果表明,采用铝合金箱体、低碳钢加强筋结构的轻质电池架减重42.6%,结构架静、动态特性都能满足要求。

The finite element model of a pure electric vehicle battery holder is established,and the stress and deformation distribution of the battery holder under the typical conditions such as vertical bumps,emergency braking and turning are obtained,and the 6th order of the battery rack is obtained by the constraint modal analysis frequency.In this paper,the multi-material structure is used to study the weight of the battery holder,and a variety of effective optimization schemes of the battery rack are obtained.Combined with the economic suitability analysis,the material structure combination scheme of the aluminum alloy box and the low carbon steel reinforcement is finally adopted.The overall performance evaluation of the battery rack after the weight reduction is carried out.The results show that the weight of the battery rack is reduced 42.6%,which achieves the expected target when the battery shelf is improved in static and dynamic characteristics.