Heat Dissipation Analysis And Optimization Of Electric Vehicle Battery Pack Based On Finite Element Method

The lithium battery in the power car meets the requirements of modern environmental protection,but the defect of the working performance of lithium ion also needs to be solved urgently.In particular,if the temperature of the lithium battery is too high or too low,it will affect the normal use of the battery.In order to optimize the operating quality of electric vehicles and meet the public's daily needs for electric vehicles,to study the temperature variation of battery pack is so essential.At present,the biggest limitation of lithium battery-powered vehicles is that when the vehicle is driving at high speed or under abnormal conditions,the internal core area and other structures of the lithium battery pack that provide power will generate heat very quickly.If the heat accumulates in a short period of time and cannot be dissipated,the battery performance will be reduced,which will seriously harm the electric vehicle.In this paper,the actual battery pack is simplified,and the model of the lithium-ion battery cell and battery pack for electric vehicles is established.By changing the variables,several factors that interfere with the heat production and heat dissipation of the lithium battery are discussed.An High-efficiency heat radiating construction for the battery pack.The chief obstacles are as follows:At the beginning of the article,it summarizes the development background of the power car,the development status of the power battery on the market including its merits and shortcomings.It also analyzes and summarizes the development of the cooling method of the battery pack and the progress of research results,focusing on the composition and production of lithium batteries.The heat transfer characteristics are summarized.Secondly,the three-dimensional model of the selected lithium battery was constructed using finite element software,and the thermal model of the battery was obtained through simulation.Then it introduces the heat transfer calculation method and leads to the CFD solution equation to obtain the basic law of heat transfer.Then rely on simulation analysis,the effects of different ambient temperatures on the battery under constant discharge rate conditions and the effects of five integer discharge rates on the battery temperature under stable ambient temperature were explored.In order to optimize the heat dissipation model of the battery pack,this paper selects three battery packs and compares and explores the heat dissipation effect of the three battery packs in the ATF liquid medium.The simulation results show that the battery pack structure with double inlets and single outlets can effectively The heat dissipation in the middle can make the temperature of the battery pack as low as 38 ?,and the temperature difference of the battery unit is controlled within 4 ?.At the same time,this paper explores the heat dissipation effect of the heat dissipation structure of the battery pack under different mass flows.The results prove that the heat dissipation effect of the battery pack accelerates with the increase of the mass flow rate,changing the direction of liquid flow and the way of import and export,and increasing the flow rate of the liquid medium.It is a very effective form of cooling to reduce the temperature of the battery pack.It can quickly restore the battery pack to normal working condition.