相变材料与水套式液冷结构耦合的圆柱型锂离子电池组热管理仿真分析

Thermal management simulation analysis of cylindrical lithium-ion battery pack coupled with phase change material and water-jacketed liquid-cooled structures

针对圆柱型锂离子电池组散热问题,设计了一种新型的相变材料(PCM)-水套式液冷耦合散热结构模型。首先研究了电池组在PCM模型的散热下,不同电池间距对电池组表面温度的影响,并得出PCM模型的最佳电池布局。然后根据PCM模型的最佳电池布局,优化PCM-水套式液冷耦合散热结构模型,即找出PCM散热模型的最佳流道结构。通过仿真分析结果表明,在6流道结构模型下,电池之间的最佳间距为8 mm;PCM-水套式液冷耦合散热模型的效果最佳,在3 C和5 C高倍率放电时,电池组的表面最高温度分别为33.78、41.11℃,相比于同尺寸PCM散热模型的最高温度,分别降低了7.23、1.06℃。采用PCM-水套式液冷耦合散热模型,电池之间的最大温差均维持在5℃以内。结果表明:该新型的PCM-水套式液冷耦合散热结构能在一定程度上保证电池组的正常工作,并提高电池组的安全性和耐用性。

In order to address heat dissipation problems in cylindrical lithium-ion battery packs,we designed a new phase change material(PCM)water-jacket liquid-cooled coupling heat dissipation structure model.First,the influence of battery spacing on the surface temperature of the battery pack under the heat dissipation of the PCM model was studied,and the best battery layout of the PCM model was determined.According to this ideal battery layout,the heat dissipation structure model was optimized,that is,we determined the optimal flow channel structure of the PCM heat dissipation model.The simulation analysis shows that under the 6-channel structure model,the PCM water-jacket liquid-cooled coupling heat dissipation model has the largest effect with an 8 mm distance between the batteries.When the 3 C and 5 C high-rate discharges,the battery The maximum surface temperatures of the group were 33.78℃and 41.11℃,respectively,which were reduced by 7.23℃and 1.06℃,respectively,when compared to the maximum temperatures of the PCM heat dissipation model of the same size.Using the PCM water-jacket liquid-cooled coupling heat dissipation model,the maximum temperature difference between the batteries remains within 5℃.These results show that the new PCM water-jacket liquid-cooled coupling heat dissipation structure can ensure reasonably normal operation of a battery pack,as well as to improve its safety and durability.