摘要
基于液体介质的动力电池热管理系统由于其在冷却速度、降温效果等方面的优势,成为目前电池热管理的主流方式。为探究基于液体介质的动力电池热管理系统的传热效果。通过实验对比的方法,验证了底部液冷式锂离子电池热管理系统在不同环境温度下冷却液温度对电池组最高温度及最大温差的影响,并运用仿真软件对电池组内部整体温度分布情况进行了分析,指出了目前常见液冷热管理系统存在的不足,为动力电池热管理系统的设计提供了参考。结果表明:电池组底部布置液冷板能有效降低电池最高温度,且随着环境温度升高,散热效果更明显,但可能造成电池模块上下表面温差大的问题。在一定范围内,电池最高温度随着冷却液温度的降低而减小,之后继续降低冷却液温度会使电池表面的温度均匀性下降。
Thermal management of batteries is typically performed in liquid medium, which is simply structured and accelerates the cooling speed. To explore the heat transfer effect of battery thermal management in liquid medium, this study examined the effect of coolant temperature on the maximum temperature and the maximum temperature difference in a battery pack. Comparison experiments were conducted at different ambient temperatures in a liquid-cooled lithium-ion battery thermal-management system. The overall temperature distribution inside the battery pack was analyzed using simulation software. The study revealed several shortcomings of battery thermal management in liquid media,providing a reference for improving the design of power battery thermal management systems. Placing a liquid-cooled plate at the bottom of the battery pack effectively lowered the maximum temperature of the battery. Increasing the ambient temperature enhanced the heat dissipation effect, but risked a large temperature difference between the upper and lower surfaces of the battery module. Within a certain range, the maximum temperature of the battery decreased with decreasing coolant temperature. Further cooling of the coolant disturbed the uniformity of the temperature concentration at the surface of the battery.
作者
郑海
续彦芳
刘汉涛
陈凯
桂文龙
ZHENG Hai;XU Yanfang;LIU Hantao;CHEN Kai;GUI Wenlong(College of Energy and Power Engineering,North University of China,Taiyuan 030051,Shanxi,China;Ningxia Baofeng Energy Co.Ltd.,Yinchuan 750000,Ningxia,China)
出处
《储能科学与技术》
CAS
CSCD
2020年第3期885-891,共7页
Energy Storage Science and Technology
基金
国家自然科学基金(51476150)。
关键词
电动汽车
锂离子电池
热管理
液冷系统
electric vehicle
lithium ion battery
thermal management
liquid-cooled system
