Optimization design of battery box with sandwich panel based on bionic badger teeth layering concept
To improve the mechanical properties of a battery box,a novel sandwich battery box with triangle umbrella-shaped cellular structure(TUCS)and negative Poisson's ratio(NPR)is designed based on the concept of bionic badger teeth layering structure.Firstly,a gradient model of bionic badger teeth is established by imitation of macro structure of badger teeth.Then,a mechanical model of TUCS with NPR is derived.Moreover,a quasi-static compression test on a TUCS sample is executed to verify the accuracy of the mechanical model and finite element simulation model.Finally,optimization design of thickness,shape,and topology for the sandwich battery box is carried out based on the modal and static results of the battery box,and the overall performances of the optimized battery box are effectively enhanced under static working conditions.Besides,the weight of the optimized battery box decreases by 56.4%.Subsequently,the impact,extrusion and drop analyses of the optimized battery box are proceeded,and the results indicate that the displacement and stress of the optimized battery box satisfy safety requirements under corresponding working conditions and the novel battery box is possessed of favorable strength and deformation resistance performances.
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