摘要
为透析电动汽车车用锂动力电池的产热问题,以某68 Ah动力锂电池为例,构建锂动力电池三维电化学-热模型,并通过不同放电倍率条件下电压与温度的变化,验证该模型的准确性。最后,利用构建的锂动力电池模型对电池单体和电池组在不同工作条件下的热特性进行仿真分析。研究结果表明,锂电池放电倍率越高电池表面升温越高,且电池组中的电池升温幅值大于电池单体的升温幅值,这主要是由于电池集聚效应引起电池组在各方向的散热不同所致,正是电池的集聚效应造成电池单体和电池组表现出不同的热特性。
To analyze the heat generation problem of EV vehicle power lithium battery,a 3D electrochemical-thermal model of lithium battery was constructed with a 68 Ah power lithium battery as an example.The accuracy of the model was verified by the changes of voltage and temperature under different discharge ratio.Finally,the thermal characteristics of the single lithium battery and battery pack under different working conditions were simulated and analyzed by using the lithium battery model.The results showed that the higher the discharge rate of lithium battery,the higher the temperature rise on the surface of the battery,and the temperature rise of the battery in the battery pack was more than that of the single battery,which was caused by the heat dissipation of battery pack in all directions caused by battery agglomeration effect.Meanwhile,it was the agglomeration effect of the battery that caused the cell and battery pack to exhibit different thermal characteristics.
作者
李静静
陈萌
LI Jingjing;CHEN Meng(School of Traffic and Transportation,Northeast Forestry University,Harbin 150040,China)
出处
《森林工程》
2020年第6期87-94,共8页
Forest Engineering
基金
国家自然科学基金(31470611)
中央高校基础科研业务费(2572018EB03)。
关键词
锂电池
电化学-热模型
热特性
产热
Lithium battery
electrochemical-thermal model
thermal properties
heat generation
