Simulation Snalysis Of Electric Vehicle Battery Box Based On Decision And Methods

With the rapid development of economy,the automobile industry of China is experiencing its fastest expansion in the 21st century,but contradictions between the huge market demand,the shortage of energy and environmental pollution are becoming more and more prominent.Energy conservation,environmental protection and security has become the three difficult points of sustainable development of the automobile industry in the future.Therefore,speeding up the training and development of electric vehicles and other strategic emerging industries and realizing the independent innovation of new industry has become an important strategic need of our country.According to the plan,by 2015,Blade Electric Vehicles and plug-in hybrid electric vehicle production and sales will reach 500,000.Battery is one of the decisive factors in the quality of performance of electric vehicles,serving as energy sources for electric vehicles,the battery box is a carrier to load battery cell or batteries,the property of stiffness and strength,the collision safety and fatigue properties of the battery box will directly determine the performance of the battery pack,so the design of battery box is very important during the development of electric vehicles.Based on decision-making and methods,this paper describes the design of structure of battery box and the process of CAE analysis in detail,besides,the study of shape optimization,dynamic and static characteristics,fatigue properties of solder joints and some related problems are also included in the paper,which will help the design of battery box in future.The paper analyzes the dynamic and static characteristics of the battery box,considering the force situation when electric vehicle runs on an uneven road taking a sudden turn or a sudden brake,which provides basis to ensure the target of shape optimization.Besides,the paper analyzes the constant frequency vibration of the battery box and obtains the stress cloud charts,which provides basis for comparison for dynamic characteristics of optimized model.Based on the analysis of dynamic and static characteristics,the paper improves the structure of the battery box provided by a special business using finite element method and improves the intrinsic frequency of top cap of the battery box,which improves the dynamic characteristics of the battery box at some level.Besides,the paper predicts fatigue damage and lifetime of the solder joints using forecast principle of fatigue life and improves the fatigue life of the solder joints of the battery box by doing some optimization and improvement in distribution of solder joints.