基于开路电压法的磷酸铁锂电池SOC估算研究

Research on SOC estimation of LiFePO4 batteries based on open circuit voltage method

为了提高磷酸铁锂电池的安全性和使用寿命,需要对电池中最重要的参数--荷电状态(state of charge,SOC)进行有效的估算。因此,对电池SOC的估算方法进行研究,通过一种精简的开路电压法可以快速并相对准确地估算磷酸铁锂电池的SOC,相关充放电实验确定了开路电压与电池SOC的对应关系,并分别选用静置前后的开路电压对电池的SOC进行估算。结果表明在磷酸铁锂电池出色的性能基础上,这种简单快捷的开路电压法可以精确地估算其电池的SOC。

In order to improve the safety and service life of lithium iron phosphate battery,it is necessary to effectively control and manage the most important parameter in the battery-the state of charge(SOC).Therefore,the estimation method of battery SOC was studied in this paper.By using a simplified open-circuit voltage method,the SOC of lithium iron phosphate battery could be estimated quickly and relatively accurately.The corresponding relationship between the open circuit voltage and the SOC of the battery was determined by the related charge-discharge experiments.The open-circuit voltages before and after static were used to estimate the SOC of the battery.The results show that this simple and quick open circuit voltage method can accurately estimate the battery SOC based on the outstanding performance of lithium iron phosphate battery.