动力锂离子电池放电热模拟分析  

Analysis of discharging heating simulation of lithium-ion power battery

作　　者：安治国[1] 李升东 张栋省[1,2] 王凡宇 孙冠龙[1] 

机构地区：[1]重庆交通大学机电与车辆工程学院,重庆400074 [2]广东精进能源有限公司研究院,广东佛山528305

出　　处：《电源技术》2018年第2期188-190,261,共4页Chinese Journal of Power Sources

摘　　要：动力锂离子电池放电过程中的热安全性问题是电动汽车必须解决的关键问题。通过实验得到了单体电池的内阻随SOC的关系曲线和正负极耳内阻,计算了电池沿各个方向的导热系数和放电过程中的热生成速率,建立三维电池热模型,得出电池的热分布。由1 C放电1 h后电池的热分布来分析电池的热行为,同时验证了模拟结果的准确性,并模拟了不同表面对流传热系数条件下对电池内部散热的影响。结果显示提高电池表面对流传热系数可以提高电池散热能力。Thermal safety problem in the discharge process of lithium-ion battery is a key problem that must be solved for electric vehicles. The relationship between internal resistance of battery and SOC was built, the positive and negative pole resistance were tested through the experiment, and the heat conduction coefficients along different directions and the heat generation rate in discharge process were calculated. The battery three-dimensional thermal model was established and heat distribution data were acquired. Thermal behavior of the battery under the condition of discharging at 1 C for 1 h was analyzed based on the battery heat distribution data, and the accuracy of the simulation results was verified. The influence of heat transfer coefficient on the internal heat of the battery was simulated. The results show that improving the heat transfer coefficient of the cell surface can improve the heat dissipation capability of the battery.

关 键 词：动力锂离子电池 三维模拟 热分布 

分 类 号：TM912[电气工程—电力电子与电力传动]