Study On The Lightweight Structure Of A Multi Electric Vehicle Battery Frame

Based on the finite element theory and the optimization of multi material structure,this paper takes the battery frame of a pure electric vehicle as the research object.According to the structural parameters of the existing battery holder,The three-dimensional geometric model is established,and through a series of processing model simplification,geometric cleaning,mesh,battery frame weight,attribute setting,grid quality testing,established the finite element model of battery holder.Using the CAE simulation analysis technology,the static characteristic,the restraint mode and the frontal collision simulation analysis are carried out.Forward braking,reverse brake,turn left,turn right five typical conditions,according to the pure electric vehicle to bump vertical stress and deformation of the parts of the battery holder is calculated,the stress and deformation distribution;the battery holder 10 order constraint modal analysis,obtain the battery holder 10 natural frequency with the vibration mode;and the simulation analysis is carried out according to the battery positive collision head-on collision test conditions,obtain the battery holder in the collision process of stress,deformation and warping degree,provide reference data for the lightweight design in the future.Based on genetic algorithm,the weight and cost of the battery holder as the optimization objective,material and structure components of the battery rack thickness as design variables,the deformation of battery holder under the typical working conditions and natural frequency values for multi-objective optimization of the material structure of battery holder constraints,through MATLAB programming,operation the feasible solution,combined with the economic applicability of the optimal material and structure scheme of lightweight battery holder.Aiming at the optimization solution several best material and structure scheme in the set,the loads and constraints are unchanged,analyze the static characteristics,constraint mode,the cell frame stress and deformation and natural frequency to evaluate the overall performance of the battery after lightweight frame through analysis and calculation,considering the overall performance of the lightweight,battery holder the degree of applicability,economy,and ultimately determine the low carbon steel reinforcement and Aluminum Alloy,lightweight scheme box under the battery holder material combination,then the battery frame of the material combination of the collision simulation analysis to verify the lightweight battery holder meets the safety performance requirements,results show that the battery lightweight frame after the dynamic and static characteristics and impact properties are improved,and the structure of the safety factor is more than 2,so the battery holder 42.6% weight reduction,to achieve the desired goals.