Research On Heat Dissipation And Performance Optimization Of A Prismatic Li-ion Batery Module

Under the dual pressures of environmental crisis and energy crisis,new energy vehicles have been recognized by the public.As a power core of electric vehicles,batteries play a pivotal role in the vehicles,it generating a large amount of heat during operation,which causes the temperature of the battery to rise.When the temperature exceeds the normal range,it will affect the performance and service life of the battery.Once the temperature is too high,it will cause serious safety problems such as spontaneous combustion or even explosion.Especially at high discharge rates and high ambient temperatures,heat is particularly severe.At the same time,the temperature difference inside the battery module is also an important factor affecting the battery performance.The low temperature uniformity will lead to decrease in the life of the battery module,and will also break the heat balance of the battery module,thereby causing safety problems.In this paper,the heat transfer model of the battery is established by understanding the working principle of the Li-ion battery.The heat management of the thermal management is analyzed by Fluent software.After studying the discharge heat state of Li-ion batteries,a new water cooling system was designed.The CFD method is used to simulate the discharge of the battery cells and the modules,and the heat generation condition is analyzed,and the highest temperature and the average temperature are counted.The designed cold plate water cooling system is installed into the battery cells and modules.We simulate and analyze the heat dissipation effect of the system.In order to control the maximum temperature difference inside the module within a certain range,the fluid flow between each pipe in the cold plate must be kept uniform.Considering the limited space of the car,this paper designs a tree-type pipe using the minimum entropy production method to reduce the power consumption.Finally,the liquid distribution system is integrated with the heat dissipation system for simulation,which can provide guidance for engineering applications.