不同放电倍率下锂离子电池热效应分析研究

Study on Heating Analysis of Lithium Battery for Different Discharge Rates

温度对于锂电池的性能、安全及使用寿命有着很大的影响。针对锂电池放电过程中的发热问题,利用Space Claim建立了额定容量为14.6 Ah的LiMn_2O_4正极/石墨阳极方形锂电池三维模型,采用Fluent软件中的MSMD Battery Model模块对放电倍率为0.5C、2C、3C、5C下锂电池的温度场分布进行模拟研究,并与实验结果进行对比验证,研究结果表明:模拟结果与实验数据基本吻合,随着放电过程的进行,电池温度逐渐升高,温度最高处基本位于远离电极的底部区域,放电倍率越高电池的升温速率越快,随之温度也越高。

The temperature has importantly influenced on performance,safety and cycle life.In order to solve the problem of heat generation during the process of discharge,a three-dimensional model of a square lithium battery with capacity of 14.6 Ah and LiMn2O4 positive elec?trode/graphite anode is established.The temperature field of lithium battery at 0.5C,2C,3C,5C was analyzed by MSMD Battery Model in Flu?ent,The results compared with experiment show that the simulation results are basically consistent with the experimental data,with the dis?charge process going on,the temperature of the battery increases gradually.The highest temperature is basically located in the bottom area of the electrode.the battery temperature and heating rate are rised faster at high discharge rate.