退役磷酸铁锂动力电池容量衰减性能分析研究  

Study on performance degradation characteristics of retired lithium iron phosphate power batteries

作　　者：赵光金 张雪盈[1,2] 王放放 赵理 王贺岑 ZHAO Guang-jin;ZHANG Xue-ying;WANG Fang-fang;ZHAO Li;WANG He-cen(State Grid Henan Electric Power Research Institute,Zhengzhou Henan 450052,China;Laboratory of Grid Waste Treatment and Resource Recycle Technology,State Grid Corporation of China,Zhengzhou Henan 450052,China)

机构地区：[1]国网河南省电力公司电力科学研究院,河南郑州450052 [2]国家电网公司电网废弃物资源化处理技术实验室,河南郑州450052

出　　处：《电源技术》2020年第3期360-363,共4页Chinese Journal of Power Sources

基　　金：国家电网有限公司科技项目(52170218003)。

摘　　要：首先分析了退役软包磷酸铁锂单体电池(简称"退役电池")容量循环性能,发现容量与循环次数呈线性关系。其次,研究了退役电池循环寿命预测方法及结果,得出:电池剩余循环寿命十分可观,电池能量和容量衰减具有较高的一致性。分析了个别电池发生容量衰减突变的现象及特点。最后,利用高斯分布统计方法对电池一致性变化进行了评估。结果显示:电池容量离散程度随循环次数先减小后增加,在约500次循环的时候离散程度最小。Firstly,the capacity cycling performance of retired lithium iron phosphate batteries(referred to as "retired batteries") is analyzed.It is found that the capacity has a linear relationship with the number of cycles.Secondly,the methods and results of predicting the cycle life of retired batteries are studied.It is demonstrated that the residual cycle life of batteries is considerable,and the energy and capacity decay of batteries have a high consistency.The phenomena and characteristics of abrupt change in capacity attenuation of some individual batteries were analyzed.Finally,Gauss distribution statistical method was used to evaluate the battery consistency change.The results show that the dispersion degree of cell capacity decreases first and then increases with times of cycles,and it is the smallest when the number of cycles is about 500.

关 键 词：退役动力电池 磷酸铁锂电池 容量循环性能 衰减特性 能量分布 

分 类 号：TM912[电气工程—电力电子与电力传动]