车用锂离子电池组冷却系统传热仿真分析

目的 解决电动汽车锂离子电池组在高温下的安全性和热失控问题.方法 建立锂离子电池组冷却系统的三维分析模型,应用计算流体动力学(Computational Fluid Dynamics,CFD)方法 ,结合热传导和热对流理论,对电池组进行仿真分析.结果 锂离子电池组的温度场分布基本相同,呈现出中间低、两侧高的分布特点,且...

Simulation Analysis of Heat Transfer in Cooling System of Li-ion Battery Pack for Vehicles

To solve the safety and thermal runaway problem of the lithium-ion battery pack of electric vehicle under high temperature,the three-dimensional analysis model of lithium-ion battery cooling system is established.The computational fluid dynamics(CFD)method is applied to simulate and analyze the battery pack with the theory of heat transfer and convection.The temperature field distribution of lithium-ion battery packs is basically the same,with the characteristics of low in the middle and high on both sides,and changed level.The lower the coolant temperature is,the lower the maximum temperature of the battery pack is;the higher the coolant inlet flow rate is,the lower the maximum temperature inside the battery pack is;the cooling plate material has little effect on the cooling effect of the battery pack.For aluminum alloy cooling plate,the cooling effect of the battery pack is the best when the temperature of the coolant is 20℃and the inlet flow rate is 2 m/s.For the cooling system designed in this paper,the change of coolant inlet flow rate and cooling plate material has little effect on the cooling effect of the battery pack,while the change of coolant inlet temperature has great effect on the cooling effect of the battery pack.Therefore,reasonable inlet temperature and flow rate of coolant should be selected,and aluminum alloy should be selected as cooling plate material to meet lightweight requirement,prevent excessive cooling of battery pack,reduce resistance loss in flow channel and improve cooling efficiency of cooling system.