Research And Optimization Of Thermal Management For Battery Pack Of Pure Electric Vehicle

Nowadays,with the increasing number of electric vehicles,people’s safety requirements for the power battery of electric vehicles are also improved.When the temperature in the battery pack is so high that it will affect the overall performance of the battery,and even cause fire.Therefore,the thermal management of battery pack is particularly important.On the premise of summarizing the main ways of thermal management of battery pack and the research status,this paper models and simulates the structure of battery pack with liquid cooling mode,and optimizes the structure of cooling channel according to the simulation results.In this paper,CATIA,Ansa and Starccm+are used to analyze the simulation results in the process of modeling and simulation of battery pack structure,and then the next optimization design scheme is put forward until the reasonable simulation results are achieved.The main work of this paper is as follows:Firstly,the first cooling channel is used to simulate the heat dissipation of the battery pack,the simulation results of the channel under different inlet mass flow rate and coolant temperature are analyzed,it is found that the heat dissipation temperature in the battery pack is not uniform,and the overall temperature consistency of the battery pack is so poor to meet the heat dissipation standard that we should find out the shortcomings of the water channel structure,optimize and improve the structure of the cooling channel,and control the temperature in the battery pack in a reasonable range.Secondly,on the basis of the original water channel,the structure is improved to solve the problem of uneven temperature of the battery pack caused by uneven distribution of coolant in the original water channel.In order to enhance the effect of cooling channel structure on the diversion of coolant,the diversion baffles of coolant are added at the inlet and outlet respectively,so that the distribution of coolant in the channel is more uniform.Then the simulation results are compared with those before improvement,and it is found that the improved water channel structure has good heat dissipation performance for the battery pack under low heating power,however the cooling effect of the battery pack temperature is not good under the simulation condition of high power,and the pressure difference between the inlet and outlet of the improved water channel structure becomes larger,which indicates that the improved water channel structure still has shortcomings,and further optimization of the water channel structure is needed.Finally,the structure of the cooling channel is further optimized and the simulation of changing the position of the water outlet and changing the structure size of the baffle and the ridge on both sides of the channel is carried out again,the results are compared with those before optimization.After comparative analysis,the results are compared with those before optimization,it is found that the problem that the cooling effect of the battery pack is not good at high power is solved,moreover the pressure difference between the inlet and outlet is also reduced,and the desired results are verified to be successful,indicating that the final optimization purpose is achieved.