21700圆柱锂离子电池组风冷散热分析

Analysis of Air Cooling and Heat Dissipation of 21700 Cylindrical Lithium Ion Batteries

以21700圆柱电池单体为研究对象,应用CATIA建立电池包三维模型,运用COMSOL平台进行散热有限元分析。以风冷对流换热的方式对电池模组进行散热,分析两种排列方式以及单体间距对电池模组散热性能的影响。发现单体交叉排列电池组与外界对流换热加强,散热效果较好;随单体间距的加大,电池组的散热效果更佳。分析结果为动力电池风冷散热系统设计提供参考。

Based on the three-dimensional model of 21700 cylindrical cell, the finite element analysis of heat dissipation was carried out by using COMSOL. The air-cooled convective heat transfer was used to heat the battery module. The effects of two arrangement modes and the distance between the cells on the heat dissipation performance of the battery module were analyzed. It is found that the convective heat transfer between the cross banding cell pack and the outside is strengthened and the heat dissipation effect is better. It is also found that the heat dissipation effect of the cell pack is better with the increase of the cell spacing. The analysis results provide reference for the design of the air-cooled heat dissipation system of power battery.