摘要
针对电动汽车动力电池组热管理需求,设计了一种扁管束叠层液流换热结构,并通过CFD计算对比分析了添加高导热石墨膜前、后电池组冷却过程中的温变性、温度一致性和温均性等。仿真计算结果表明:未添加石墨前电池片间扁管束和单片电池表面扁管间换热一致性较好,但相同电池片上不同特征点间温度差异较大;此外,电池表面铺垫柔性石墨后电池温降速率明显增大,同时单片电池温均性得到显著提升。这表明本文设计的管束叠层液流换热结构能够保障电池组较佳的热管理效果,与整板式液体换热电池包相比进一步实现了轻量化。
To explore Battery Thermal Management （BTM） for Electric Vehicle （EV）, a heat exchanger of battery pack is designed using aluminum flat tube bank and flexible graphite. The investigation focuses on the thermal characteristics of the battery pack in the BTM process, such as the temperature variation and temperature uniformity of the battery pack and cell surface etc. The computation results show that, without flexible graphite, the heat exchange of flat tube banks in battery pack and flat tubes on cell surface present better consistency, but the temperature difference is larger for different measure points in the same battery cell. In addition, the battery cooling speed rises obviously, and the temperature uniformity of cell surface is significantly improved. The results indicate that the battery pack obtains well cooling effect, and it also realizes further lightweight compared with full-contact liquid cooling plate.
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2017年第4期1032-1039,共8页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金项目(51376079)
关键词
车辆工程
电池热管理
管束叠层
柔性石墨
温均性
vehicle engineering
battery thermal management
laminated flat tubes
flexible graphite
temperature uniformity
