不同SOC区间及倍率下锂电池老化分析

选择合适的荷电状态(State of Charge,SOC)区间及放电倍率可有效减缓锂电池的老化.将可大倍率放电的钴酸锂电池作为研究对象,将其SOC划分为四个区间,结合三个不同的放电倍率进行双因素老化实验.结果表明,相同放电深度(Depth of Discharge,DOD)情况下,SOC区间越高电池老化越快;释放的容...

Aging analysis of lithium battery under different SOC range and discharge rate

It is crucial to select suitable SOC(State of Charge)range and discharge rate in order to effectively slow down the aging of the lithium battery.The SOC range of lithium cobalt oxide battery with high discharge rate has been divided into four,combing with three different discharge rates,the two-factor experiment was conducted.The results show that under the same DOD(Depth of Discharge),the high SOC range would raise the velocity of battery aging.The deeper DOD would lead to the higher aging velocity while releasing the same capacity.In addition,the aging rate is less affected by the discharge rate in the low SOC range while become faster with higher discharge rate in the high SOC range.The aging model based on the power rate equation with three elements of SOC interval,DOD and discharge rate was established to analyze the aging mechanism of lithium cobalt oxide battery.The goodness of fit can reach more than 97.5%,indicating that the proposed model can predict the aging of the lithium battery accurately.