Static-dynamic Analysis And Structural Optimization Of Electric Vehicle Battery Box

At present, with the requirements of environmental pollution and the high priceof oil, the development of the traditional vehicle gets more and more obsession.soautomotive enterprises pay more attention to the development of electric vehicle inmany countries. Like the traditional vehicle, components of electric vehicle also mustsatisfy the relevant safety requirements and guarantee the service life. The structureperformance of battery box is very important, because it is the protection device ofbattery in electric vehicle, and it is important to study stress and displacementdistrubting of battery box in particular condition and optimize the positions where areweak in intensity and rigidity.The static strength analysis of battary box was done through the calculation ofthe stress of the battery box when the electric vehicle driving on the uneven roadsharp turn and nasty in this paper. A comprehensive grasp about the dynamiccharacteristic of battary box was done by analysing the mode characteristic andconstant frequency vibration of battery box, and verify the constant frequencyvibration simulation method’s correctness through comparing the test results. Theconstant frequency vibration simulation calculation results provides important andfaithful reference for the of battery box.Using optimization method and taking displacement of the node located in thecenter of roof and baseplate as optimal objectives, using optimization design modulein hyperwork to optimize the distribution shape and size of stiffener in roof andbaseplate. Optimized stiffener was confirmed by comparing the dynamic and staticcharacteristics of new structure and original structure.The structure of battery have been improved through CAE method based onfinite element theory. On the top cover, the maximum stress in the area where is easyto be destroyed, the stress loss is about16.6%, and the displacement in central area57.1%. By using the stiffener in the baseplate to replace the little effect supportcomponents below the baseplate and the structure change in other parts，the weightloss of battery box is about7.2%.