Analysis & Design Of The High Voltage Safety Of Pure Electric Vehicles In Crash

In China,the industry of pure electric vehicles is developing rapidly.However,in the event of a crash of BEV,there will be dangerous accidents such as fire and explosion,and it is urgent to solve the crash safety problem of HVS.For the safety R&D design of BEV,it is necessary to understand the structural characteristics of the HVS,assess the safety of the power battery and the HVS under the crash conditions,and formulate a safety protection strategy for the high-voltage power to ensure the safety of the passengers on the vehicle.In this paper,a micro-pure electric vehicle is taken as the research object,and the crash simulation analysis of its high-voltage safety risk problem is carried out to complete the crash electric safety protection design.The main research work is as follows:(1)Establish a FE analysis model for crash of micro-pure electric vehicles.According to the structural characteristics of the HVS,the HVS is modeled,and the high-voltage harness is refined.The harness model in the crash simulation shows the failure condition.Establish a crash working condition analysis matrix,use CAE to analyze the safety risk of high voltage electricity,obtain the electrical safety risk of BEV under various crash conditions;conduct safety assessment of high voltage wiring harness layout and check the bolt installation strength of power battery,The results of the crash simulation test are used to complete the corresponding improvement scheme design according to the damage condition of the high voltage electrical appliance.(2)According to the results of crash analysis,the content of BEV crash and power failure protection needs to be considered,and the high-voltage power safety protection control strategy is completed.Based on the electronic control unit,battery management system,high-voltage relay and fuse,the design of the collision power-off protection control system is implemented,and the power-off protection function of the pure electric vehicle is implemented.Realize the requirements of BEV to meet the safety requirements of crash high-voltage electricity,solve the problem of high-voltage electric safety protection,and make it meet the requirements of GB/T 31498-2015.(3)Using the intelligent algorithm to study the frontal crash recognition algorithm of the pure electric vehicle power failure protection control strategy,so that the power failure protection control system can accurately make the power failure judgment.The BP neural network model is used to predict the acceleration curve and peak value of the latter part of the crash.The genetic algorithm is used to optimize the connection weight and threshold of the BP neural network crash recognition algorithm,which accelerates the convergence speed of BP neural network training and reduces the training time of the model.,increase the accuracy of its predictions,and get the correct estimate of the degree of crash.