Design And Optimization Of A Power Battery Box

As the problems of energy shortage and environmental pollution become increasingly prominent,the R&D investment of electric vehicles is increasing.The development of electric vehicles is an important way to promote the sustainable development of the automobile industry.As the main source of energy for electric vehicles,the power battery pack has a direct impact on the performance of the vehicle.As the carrier of power battery,battery box plays a key role in the safety and protection of power battery,so it has great significance for the research of power battery box.In this paper,a kind of pure electric car battery box is taken as the research object,and the following research work is carried out:(1)According to the requirements of the target vehicle,the parameters of the battery system of the electric vehicle are designed reasonably,and the battery forming method is determined.According to the domestic battery box related design specifications,the size of the battery box is determined according to the mode of module layout and the recommended standard,and the mode of module installation is designed.Considering the layout of the body structure and the installation and fixing of the battery,the connection mode of the battery box to the body is designed,and the structure of the battery box is preliminarily designed.(2)Then use the finite element analysis method to analyze the static and dynamic characteristics of the power battery box.Simplify the model according to the requirements,establish a finite element analysis model,calculate the first ten modes of the battery box,determine whether the mode shape is within the range of the excitation frequency,and whether resonance may occur;Analyze the stress and deformation of the battery box under two typical combination conditions,ie,sudden braking on the rough road and sharp turning load on the bumpy road,and evaluate the rationality of the results;The evaluation of the fatigue life of the battery box is performed by the constant frequency analysis of the battery box to determine whether the battery box can withstand the fatigue failure caused by the constant frequency vibration.(3)Finally,the battery box is optimized for its topography and size optimization.Based on the deficiencies and over-design in the analysis results,the shape of the upper part of the box is optimized for the modal analysis results;For the lower part of the box and the bottom supporting horizontal and vertical beams,optimize the size by optimizing the weight of each part with 10 thicknesses as the optimal variables.According to the results of optimization,the finite element model is re-established to analyze the static and dynamic characteristics,which proves the rationality and feasibility of the optimization.This paper takes the stamping box as the design research object,carries on the structure design,the finite element simulation and the structure optimization and so on,designs a battery box that is relatively light,the structure is reliable,has the certain engineering application value.