基于响应面法的动力电池包箱体轻量化优化设计

为了满足电动汽车电池包箱体高强度、轻量化的设计要求,提出了一种基于数值优化与有限元仿真相结合的动力电池包箱体轻量化设计方法.以电池包箱体各部件的厚度为设计变量,箱体质量最小化为优化目标,三种典型路面工况下箱体的最大等效应力、最大变形量和箱体结构的第2阶约束模态频率为约束条件,建立了箱体轻量化优化数学模型.利用Box-B...

Lightweight Optimization Design of Power Battery Case Based on Response Surface Method

In order to meet the requirements of high strength and lightweight design of electric vehicle battery case,a lightweight design method of power battery case based on numerical optimization and finite element simulation was proposed.Taking the thickness of each component of the battery case as design variable,and the minimization of the mass of battery case as optimization objective,the maximum equivalent stress,the maximum deformation under three typical road conditions and the second-order constrained modal frequency of the case structure as constraints,a mathematical model for lightweight optimization of the case was established.The combination of 5 design variables and 3 levels of numerical simulation experiments were obtained by Box-Behnken experimental design.The polynomial response surface approximation models were obtained by multiple regression analysis and Pareto variance analysis fitting,and were introduced into the lightweight optimization mathematical model for iterative optimization.The results show that the mass of the battery pack case in the optimized scheme is 7.4%less than that in the original scheme,the maximum equivalent stress is reduced by 18.6%and the maximum deformation is reduced by 22.5%under typical pavement conditions,and the second-order constrained modal frequency of the case structure is increased by 14.8%.