Analysis Of Heat Dissipation Structure For Ev And Study On Temperature Controlled Battery Pack

As the only source of power for pure electric vehicles,the power battery has a direct impact on the vehicle’s power performance,cruising range and vehicle performance.During the running of the electric vehicle,the temperature of the battery pack will rise,affecting the discharge performance and service life.The location of each cell in the battery pack is different,and the heat dissipation effect is different,causing inconsistency of the cell temperature,and affecting the discharge performance of the entire battery pack.Starting an electric vehicle or charging a battery pack at a low temperature has a serious effect on work efficiency and causes damage to the battery.Therefore,in order to improve the safety and reliability of the battery pack,it is important to optimize the heat dissipation of the battery pack.It is very important to control the temperature of the battery pack to ensure the battery performance.The working principle and heat generation characteristics of lithium iron phosphate battery are introduced,and the internal resistance characteristics and temperature rise experiments of the battery cell are performed.The finite element analysis software(Fluent)was used to simulate the temperature field of lithium iron phosphate battery cell.The experimental results were compared and the modified battery cell thermal simulation model was improved.In the advanced vehicle simulator(Advisor),the power battery pack is simulated for the pure electric vehicle,and the heat generation rate curve of the battery pack under a typical cycle condition is obtained to provide data for the simulated heat source input of the battery pack temperature field.The heat dissipation structure is designed,and according to the temperature distribution cloud diagram of the battery pack to optimize the heat dissipation structure,and then the temperature field simulation of the battery pack is performed on the optimized heat dissipation structure.The final simulation results show that through the optimization of the heat dissipation structure,the heat dissipation effect of the battery pack is evidently improved,the battery pack operates within a reasonable temperature range,and meets the requirements of battery cell temperature consistency,which can ensure good battery discharge performance.The research plan of the temperature controlled battery pack will be proposed,and a pre-heating heating strategy and a low-temperature starting heating strategy will be performed for a low-temperature environment.As for the high temperature,a binning heat dissipation strategy will be proposed.