中文摘要：

储能系统是实现智能电网能量双向流动的重要支撑条件,而大规模成组技术是大规模锂电池储能系统的发展瓶颈。针对锂电池放电时电压特性,将小波分析理论与锂电池等效电路模型相结合,并对SOC（State Of Charge,电池剩余容量）、电池内阻、放电时间之间的三维关系开展了研究,得出电池内阻随放电时间和SOC的变化在不同阶段有不同的变化趋势的结论,提出了电池管理系统中的单体电池切除的理论判断依据,预计对SOC的精确估计有较大的借鉴意义。

英文摘要：

Power storage system is the most important supporting part of energy bidirectional flowing of smart grid,and large-scale group technology is the development bottleneck of large-scale power storage system.By combining Li-ion battery equivalent circuit model with wavelet analysis on the basis of discharging characteristic of Li-ion battery,analyzing the 3-D relationship among resistance of battery,SOC and time of discharge,the conclusion that the trend of resistance of battery was different in different phase was presented.It was also the basic theory judgement for single battery removing of batteries manages system.And it might also provide a reference for precise estimate of SOC.