Structural Design And Performance Analysis Of Battery Pack Of A Blade Electric Vehicles

With the energy shortage and environmental pollution problems becoming increasingly prominent,the effective measure to promote sustainable development of the automotive industry is to develop electric vehicles.Power cell,as the only source of power on BEV,is an important index affecting the performance of BEV.The battery package is used to protect the cells from being damaged.So the safety performance of battery pack’s structure is very important.Based on the battery pack system developed for BEV,the structure of the battery pack mechanical system is designed in this paper.Further,the structural performance of the battery pack mechanical system is analyzed by finite element method.Finally,some suggestions for improvement are put forward according to the analysis results.Firstly,the relevant information was consulted to understand the current research and development status of power battery packs.Combined with the actual project experience and relevant books,the design standards of power battery pack mechanical system are summarized,which can provide reference for the follow-up design of power battery pack system structure.Secondly,according to the actual requirements of vehicle end decomposition,physical parameters such as the overall layout,actual size and material of the power battery pack are determined,and the CATIA three-dimensional software is used to build the model with the design standard.And then,the finite element model of the power battery pack is established in the finite element software,which lays a foundation for the structural analysis and improvement of the power battery pack.Thirdly,the finite element analysis software is used to analyze the mechanical static and dynamic of the power battery pack system.Combined with the national standards and enterprise standards,four working conditions including static pressure,random vibration,extrusion and simulated collision,and the defects of battery pack structure design were judged.The analysis results of static load and compression conditions show that cracking does not occur on the top cover of battery pack,and its structural design meets the requirements of three compression conditions.The results of random vibration analysis show that the structure design of the battery pack system meets the design requirements of X and Y directions.While the maximum stress of 3a of the box body and integrated water-cooled guard plate under the battery pack exceeds the yield strength of the material itself.Which means the structure of the battery pack does not meet the design requirements of the Z direction.The analysis results of extrusion conditions show that the structure of the battery pack sy stem meets the design requirements of+X and Y directions.In the simulation of-x direction extrusion,the lower box frame has the risk of squeezing into the battery module,and the battery pack system has potential safety hazards.Therefore,the battery pack structure does not meet the design requirements of-X direction.The simulation collision analysis results show that the battery pack structure meets the design requirements of X and Y directions.Finally,based on the simulation results of random vibration and extrusion failure,the weakness of battery pack structure was improved.According to the improved structure,the corresponding simulation conditions are analyzed again,and the results are compared with those before the improvement.The results show that the improved battery pack structure meets the design requirements of the corresponding conditions,which verifies the feasibility and rationality of the structural improvement scheme.