电池组风冷系统结构设计与仿真优化研究

Structural design and simulation optimization of the air cooling system of the battery pack

针对动力电池组在夏季高温时电池间温差过大的问题,对结构内流道的尺寸、出风口的尺寸、不同出风口开闭时与电池组温度场之间的关系进行了研究。提出了一种含有4个出口的风冷电池箱体结构,通过Fluent软件,对不同流道尺寸的电池组进行了散热模拟,并针对箱体的4个出口,做了单开、双开、全开等多种开闭策略的模拟。研究结果表明:两个流速较慢的流道采取5 mm流道设计,其他9个流道采取3 mm的流道设计时,该结构冷却效果最好;在打开1、2出风口或3、4出风口时,该型风冷结构可对出风口对应的电池强化冷却;以一定的周期规律性地开闭1、2出风口和3、4出风口,可以较好地改善电池组内的温度不一致性。

Aiming at the problem that the temperature difference between the batteries is too large in summer,the relationship between the size of the flow passage,the size of the air outlet,the opening and closing of the air outlets and the temperature field of the battery pack was studied. Air-cooled battery cabinet with 4 outlets was proposed. Fluent software was used to simulate the heat dissipation of battery packs with different flow channel sizes. And for the 4 outlets,a series of simulations were conducted for single opening,double opening and full opening. The results indicate that the best dimensional model is that the two flow channels with a slow flow rate adopted a 5 mm flow channel design and the other nine flow channels adopted a 3 mm flow channel design,the structure has the best heat dissipation effect; when opening the outlet of 1,2 or 3,4,the air-cooled structure can strengthen the cooling of the batteries corresponding to the air outlet; the structure can improve the temperature uniformity of the battery pack when the outlets of 1,2 or 3,4 is opened and closed regularly.