动力电池组分层风冷式热管理系统仿真

Simulation of layered air cooling thermal management system for lithium-ion battery pack

为了强化电池热管理系统的散热能力,提高电池组的温度一致性,提出了反向分层风冷结构。基于电-热耦合生热模型及计算流体动力学,运用Fluent 15.0对风冷式电池热管理系统进行稳态数值仿真计算,并对所提出的散热结构进行了改进和优化。结果表明:使用反向分层风冷结构后各电池温度分布非常均匀,电池组整体最高温度及最大温差均有所下降,电池最大平均温差大幅度降低,电池组的温度场分布明显改善;增设扰流板后电池平均温度下降2.7℃,电池平均温差下降0.6℃,散热能力和温度一致性得到进一步提高,保证电池处于最佳工作温度范围内。

A reverse layered air cooling structure was proposed to strengthen the cooling capacity ofbattery thermal management system and improve the temperature consistency of the battery pack. Basedon the electric-thermal coupling model and computational fluid dynamics, the stcady-state numericalsimulation of air cooling battery thermal management system was carried out by Fluent 15.0, and theproposed cooling structure has been improved and optimized. The results showed that by using reverselayered air cooling structure, the temperature distribution of battery was very uniform, the maximumtemperature and maximum temperature difference of the battery pack were all decreased and themaximum average temperature difference of the battery was greatly reduced, the temperaturedistribution of the battery pack, was significantly improved. After the addition of spoiler, the averagetemperature and average temperature difference of the battery dropped by 2. 7 ℃ and 0. 6℃, the coolingcapacity and temperature consistency has been further improved to ensure that the battery was in the bestworking temperature range.