某纯电动乘用车电池包液冷系统设计及热仿真分析

Design and Thermal Simulation Analysis of Liquid Cooling System for Battery Pack of a Pure Electric Passenger Car

优异的电池液冷系统可以保证电池在适宜的温度范围内工作,改善电池系统的安全性能,保证续航里程。文章介绍了一款液冷集成箱体的设计方案,并基于FLUENT仿真软件,建立动力电池系统的热仿真模型。在1C放电倍率下,对液冷系统进行压力场分析与对电池系统进行温度场分析。结果表明,该电池系统能够满足流阻要求、温差及温升要求,通过增大进口流量可以提高电池散热能力,但效果不明显,增大进口流量会显著增大进出口压差。

The excellent battery liquid cooling system can ensure the battery to work in the appropriate temperature range,improve the safety performance of the battery system,and ensure the range of service.The paper introduces the design scheme of a liquid cooling integrated box,and establishes the thermal simulation model of power battery system based on fluent simulation software.At 1C discharge rate,pressure field of liquid cooling system and the temperature field of battery system were analyzed.The results show that the battery system can meet the requirements of flow resistance,temperature difference and temperature rise.The cooling capacity of the battery can be improved by increasing the inlet flow rate,but the effect is not obvious.Increasing the inlet flow rate will significantly increase the pressure difference between the inlet and outlet.