基于Fluent的锂离子电池及模组风冷温度场数值研究

Numerical Study of Air Cooling Temperature Field of Lithium-ion Battery and Module Based on Fluent

为了研究锂离子电池充(放)电过程中热性能特点,更好地进行热管理分析,基于Fluent软件建立锂离子电池组三维瞬态散热模型并对温度场进行仿真计算,分析不同条件对电池及模组散热性能的影响。结果表明:减小充(放)电倍率和增大表面对流换热系数可改善电池因温度过高而导致的热失控。进口风速从0.5 m/s增至6 m/s且4C充电终止时,电池组最高温度、平均温度、温差、一致性系数降低了33.57 K、21.23 K、9.84 K和2.82%,但泵功耗增加了0.35 W。进风温度从298.15 K降至283.15 K且4C充电终止时,电池组最高、平均温度降低12.8 K和13.92 K,温差与一致性系数升高1.86 K和0.76%。即增大风速,电池组温升和温度均匀性得到改善;降低进风温度,可控制电池组温升,但温度均匀性抑制效果变差。

In order to study the thermal performance characteristics of lithium-ion battery during charge and discharge for better thermal management analysis,based on Fluent,a three-dimensional transient heat dissipation model of lithium-ion battery was established and the temperature field simulation calculation was carried out to analyze the influence of different conditions on the heat dissipation performance of the battery and module.The results show that reducing the charge or discharge rate and increasing the surface convection heat transfer coefficient can improve the thermal runaway of the battery due to excessive temperature.When the inlet wind speed increased from 0.5 to 6 m/s and the 4C charge was terminated,the maximum temperature,average temperature,temperature difference and consistency coefficient of the battery pack decreased by 33.57,21.23,9.84 K and 2.82%,but the pump power consumption increased by 0.35 W.When the inlet air temperature dropped from 298.15 to 283.15 K and the 4C charge was terminated,the maximum and average temperature of the battery pack decreased by 12.8 and 13.92 K,and the temperature difference and the consistency coefficient increased by 1.86 K and 0.76%.That is,the wind speed is increased,and the temperature rise and temperature uniformity of the battery pack are improved.Lowering the inlet air temperature can control the temperature rise of the battery pack,but the temperature uniformity suppression effect is deteriorated.