基于细小通道冷却板的电池冷却系统性能分析

Performance analysis of battery cooling system based on mini-channel cold plate

针对锂离子电池在高倍率放电下温度过高的问题,设计了一种新型细小通道冷却板,并利用计算流体力学(computational fluid dynamics,CFD)进行了电池组散热仿真分析.对比了不同流道形式冷却板的冷却效果,优选出效果较好的流道形式,并以此为基础,综合对比了冷却液入口质量流量以及流道结构参数对电池组温度的影响.结果表明:串并联结合的流道形式具有更好的温度表现以及较小的压力损失;冷却液质量流量的增加会带来更好的温度表现,但影响会逐渐变缓;流道宽度的增加会使电池平均温度下降,并提升温度均匀性,电池最高温度呈现先降低后略微上升的趋势;流道高度的增加会降低冷却液流速,造成电池最高温度以及温差的升高.

To solve the problem of high temperature for lithium-ion battery during high rate discharge,a new type of cold plate was designed based on mini-channel,and the computational fluid dynamics(CFD)was used to simulate the cooling effects of battery module.The cooling properties of cold plates with different channel types were compared to select the channel type with better temperature performance and the effects of inlet mass flow of coolant and channel structure parameters were analyzed based on the optimized channel type.The results show that the channel combined in series and parallel has good performance,which can lower the temperature of battery module and improve the temperature uniformity with reduced coolant pressure drop.The increasing of coolant mass flow rate can improve the cooling effect,which slows down gradually.The increasing of channel width can reduce the average temperature of battery module and improve temperature uniformity,and the maximum temperature is decreased with latter slight increasing.With the increasing of channel height,the coolant flow rate is decreased,and the maximum battery temperature and the temperature difference are increased.