纯电动汽车锂电池组液冷散热系统的设计与仿真  

Design and Simulation of Liquid Cooling System of Li-Ion Battery Pack For A BEV

作　　者：李煜 蔡玉梅[1,2] 曾凯 马仪[1] 胡南海 Li Yu;Cai Yu-mei;Zeng Kai;Ma Yi;Hu Nan-hai(School of Mechanical and Energy Engineering,Shaoyang University,Shaoyang 422000,China;Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing,Shaoyang University,Shaoyang 422000,China;Automotive Engineering Research Institute,BYD Co.,Ltd.,Shenzhen 518118,China)

机构地区：[1]邵阳学院机械与能源工程学院,湖南邵阳422004 [2]邵阳学院高效动力系统智能制造湖南省重点实验室,湖南邵阳422004 [3]比亚迪股份有限公司汽车工程研究院,广东深圳518118

出　　处：《内燃机与配件》2023年第22期20-25,共6页Internal Combustion Engine & Parts

基　　金：湖南省自然科学基金项目(20C1642);邵阳学院研究生科研创新项目(CX2021SY017)。

摘　　要：基于对某纯电动汽车锂电池组参数选型而确定1P105S电池单元布局形式,设计了宽式和窄式两种液冷散热流道,并于1.5C充放电倍率时分别在25℃、45℃环境温度下对该电池组进行了温度场仿真以及在0.5m/s和1m/s入口流速下对流道流体进行了速度场仿真,结果表明:仿真与试验数据吻合良好;在相同温度、入口流速下,窄式流道液冷散热系统有更好的散热效果;窄式流道内部流体温度均匀性更好,可更好地降低电池组内部温差;窄式流道内部流体最高流速更高,冷却液流动性更剧烈,可带来更高的换热效率;当环境温度达45℃时,电池组温差超过5℃,可能会降低锂电池组性能、缩短循环使用寿命,需进一步改进液冷散热系统。Based on the parameter selection of a BEV Li-ion battery pack,the layout of 1P105S battery cell was determined,then both a wide and a narrow liquid cooling flow channel were designed.At a charge&discharge rate of 1.5C,the temperature field simulation of battery pack was carried out at an ambient temperature of 25℃and 45℃respectively,subsequently,the velocity field simulation of fluid in flow channels was carried out at an inlet flow velocity of 0.5m/s and 1m/s respectively.The results show that the simulated and experimental data are in good agreement;at the same temperature and inlet flow rate,the liquid cooling system with the narrow channel has better heat dissipation effect;fluid in the narrow flow channel has better uniformity of temperature,which can better reduce the temperature difference inside the battery pack;the maximum flow velocity of the fluid in the narrow channel is higher,and the coolant flow is more intense,which can bring higher heat transfer efficiency;when the ambient temperature reaches 45℃,the temperature difference of battery pack exceeds 5℃,which may reduce the Li-ion battery pack performance and shorten its cycle life,then need further improvement of the liquid cooling system.

关 键 词：纯电动汽车 锂电池组 液冷散热系统 设计 仿真 

分 类 号：TK018[动力工程及工程热物理]