Design And Optimization Of Liquid Cooling For Vehicle-mounted Energy Storage Battery Pack

Lithium-ion:Lithium-ion batteries are widely used as automotive power batteries,and their safety has attracted widespread attention.The main energy storage components of energy storage power vehicles are also lithium-ion batteries.Like automotive power batteries,their safety performance and working performance are significantly affected by temperature.In order to meet the safe and efficient use performance of energy storage battery packs,this paper aims to improve the heat dissipation performance of lithium-ion battery packs.Conduct the following research:(1)Select the battery model suitable for the energy storage battery pack,and determine the connection method of the battery pack according to the reliability analysis.Combined with the design indicators of the energy storage battery pack,the energy storage battery pack ratio calculation is performed to determine the battery pack voltage level,stored power and battery pack capacity.Analysis of battery structure principle,heat generation and heat transfer characteristics.(2)Establish a battery thermal model,calculate the battery thermal physical parameters and heat generation rate,create a battery module geometric model,and use the finite element method to analyze the heat generation of the battery module.Experimentally test the capacity,internal resistance and temperature rise curve of the battery module of the single battery.The accuracy of battery thermal model and simulation parameter settings is verified through comparative analysis of experiment and simulation.(3)The geometric model of the energy storage battery pack was established to explore the effects of the discharge rate and ambient temperature on the heat generation of the energy storage battery pack under the condition of natural convection heat dissipation.Design different liquid-cooling plate structures,use Fluent to perform numerical analysis,explore the heat dissipation effect of different liquid-cooling plates,and analyze the influence of the flow direction of the cooling liquid inlet and outlet on the heat dissipation performance of the battery pack based on the built-in four-inlet liquid-cooling plate.(4)Based on the built-in four-inlet liquid-cooling plate,the control variable analysis method is used to quantitatively analyze the influence of factors such as the initial temperature of the cooling liquid,the inlet flow rate of the cooling liquid,and the thickness of the cooling channel on the heat dissipation effect of the battery pack.(5)An orthogonal test was designed,and the range and variance were used to analyze the significant degree of influence of different cooling factors on the heat dissipation effect of energy storage battery packs.optimal combination of factor levels.Finally,through the simulation verification,it is found that the maximum temperature and the maximum temperature difference of the battery pack can be controlled within the ideal temperature range under this level combination,which can ensure the safety of the battery pack,and can provide theoretical guidance for the liquid cooling design of the energy storage battery pack.