磷酸铁锂动力电池组容量损耗分析

Capacity Loss Analysis of Lithium Iron Phosphate Power Batteries Group

对磷酸铁锂电池的充放电原理和自放电进行了分析,并对动力电池组进行了充放电实验。根据电池组在使用过程中单节电池容量变化情况,讨论了电池组单节电池容量衰减的原因,并分析了单节电池容量衰减对电池充放电性能的影响。提出了一种带有均衡装置的减缓电池组容量衰减的电池管理方法。实验表明,新的电池管理方法减缓了电池组容量衰减的速度,使电池组都能充满电,有利于电池组的有效使用,延长了电池组的循环使用寿命。

Charge-discharge principles and self-discharge of lithium iron phosphate（LiFePO4） are analyzed,and charge-discharge experiments are carried out.According to the change of single battery capacity in using,capacity fading of single battery is discussed,and capacity fading of single battery on battery group charge-discharge performance is analyzed.Accordingly,a method of slow batteries group capacity decay with equalization device is proposed.Experimental results show that this new management method of batteries group slows the rate of batteries group capacity decay,and all batteries can be fully charged,which is conductive to the effective use of the batteries group,and extends cycle life of batteries group.