磷酸铁锂电池SOC估算的研究

Research on SOC Estimation of LiFePO4 Li-ion Batteries

磷酸铁锂电池SOC的估算对电池组的寿命有着重要影响。在完成电池特性实验基础上提出一种能够准确估算磷酸铁锂电池SOC的方法--以Ah计量法为基础,利用开路电压法减小Ah计量法的累计误差。仿真结果表明,所提方法比传统Ah计量法具有更高的精度。

SOC estimation of LiFePO4 Li-ion batteries has an important impact on battery life. Therefore, based on comple-ting the experiment of battery characteristics, this paper presents a method to accurately estimate SOC of LiFePO4 Li-ion batteries, which is based on Ah measurement method and applies open-circuit voltage method to reduce the accumulative error of Ah measurement method. The simulation results show that the proposed method has higher accuracy than the traditional Ah measurement method.