储能用磷酸铁锂电池循环寿命的能量分析  

Cycle-life Energy Analysis of LiFePO_4 Batteries for Energy Storage

作　　者：高飞[1] 杨凯[1] 惠东[1] 李大贺[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《中国电机工程学报》2013年第5期41-45,8,共5页Proceedings of the CSEE

基　　金："十一五"国家科技支撑计划重大项目(2011BAA07B07)~~

摘　　要：通过对储能用磷酸铁锂电池不同放电深度(40%DOD^100%DOD)的循环测试,考察电池在此期间累积的转移能量与电池老化程度之间的相关性。经过对长期循环试验的数据分析,得出电池累积转移能量与循环次数的关系符合Box Lucas模型;随着放电深度的增加,电池老化现象对电池能量转移能力的影响逐渐减小;通过计算电池即时容量衰退速度,认为电池在循环使用中经历了前期逐渐自稳定和后期加速老化的2个阶段。电池容量衰退至85%之前,深充深放与浅充浅放的使用模式对于电池能量转移能力的影响是相同的,当电池容量衰退至75%时,深充深放的使用模式在电池能量转移总量和能量效率上均优于浅充浅放的使用模式。The correlation between the accumulative transfer（AT） energy of LiFePO4 battery and battery aging degreewas investigated by controlling the depth of discharge（DOD） in the range from 40% DOD to 100% DOD and 1C rate charge/discharge cycle experiments.By analyzing results of long-term cycle experiments,the AT energy and cycle number accorded with Box Lucas model,meanwhile,the influence of battery aging on the ability of LiFePO4 battery to transfer energy was gradually reduced with the increase of DOD.By calculating instant capacity fading rates of all samples,the state of LiFePO4 battery was divided into two stages：the battery inclined to a self-stabilization state in the former stage and then experienced an accelerated aging state in the latter stage.The influence of lighter charge/discharge usage mode on the ability of LiFePO4 battery to transfer energy was identical to deeper charge/discharge usage mode before battery capacity decayed to 85%,however,when the capacity decayed to 75%,the latter usage mode was superior to the former usage mode in AT energy and energy output/input efficiency.

关 键 词：储能 磷酸铁锂电池 循环寿命 累积转移能量 

分 类 号：TM911[电气工程—电力电子与电力传动]