基于扭转刚度的电池包与车身集成设计研究

Research on Integrated Design of Battery Pack and Car Body Based on Torsional Stiffness

白车身扭转刚度是承载式车身的重要力学性能指标,对整车操稳性有着直接的影响,同时也是衡量车身轻量化水平的重要指标。由于新一代的纯电车身与传统车身有较大的结构框架差异,因此在车身设计初期,以提升扭转刚度为目标重新定义传力路径。本文基于理论分析及拓扑优化的方法找寻车身扭转刚度的最佳传力路径,通过电池包与车身的集成设计,使得车身形成多个近似圆环状的封闭结构。在车身没有增加额外质量的前提下,白车身扭转刚度可达到40000 N·m/(°),车身轻量化系数达到1.75,做到纯电车的领先水平,同时使得整车操稳性能也大幅提升。

The torsional stiffness of the body-in-white is an important mechanical performance index of the load-bearing body,which has a direct impact on the handling stability of the vehicle,and is also an important index to evaluate the lightweight level of the body.Since the new generation of pure electric body has a large structural frame difference from the traditional body,in the early stage of body design,the force transmission path is redefined with the goal of improving torsional stiffness.In this paper,based on theoretical analysis and topology optimization,the optimal force transmission path of the torsional stiffness of the body is found.Through the integrated design of the battery pack and the body,the body forms a plurality of closed structures that are close to a circular ring.On the premise of no extra weight adding to the car body t,the torsional stiffness of the body-in-white can reach 40,000 N·m/(°),and the lightweight coefficient of the body can reach 1.75,achieving the leading level of pure electric vehicles,and at the same time greatly improving the handling stability of the vehicle.