【摘要】 提出一种基于电化学阻抗谱(EIS)的电池荷电状态(SOC)估计方法。通过对磷酸铁锂电池在不同SOC以及不同温度下的EIS进行测量,利用高、中、低频全频带信息,从幅值和相位两个角度归纳总结了电池EIS的变化特性。结果表明,特定频率下的电池阻抗相位在温度一定时与电池SOC有较强的线性关系,可作为SOC估计的参数。建立了基于EIS的电池SOC估计算法,初步验证了利用EIS估算电池SOC的可行性。更多还原

【Abstract】 An electrochemical impedance spectroscopy（EIS） based state of charge（SOC） estimation method was proposed in this paper. The EIS of LiFePO₄ battery under different SOCs and different temperatures was measured,and the variation characteristics of EIS were summarized from the aspects of amplitude and phase by using the full band information. The characteristics show that the impedance phase of the LiFePO₄ battery at a certain frequency has a strong linear relationship with SOC when the temperature is constant,so it could be used as parameter of SOC estimation. Finally,an EIS based SOC estimation method was established,and the feasibility of using EIS to estimate SOC was preliminarily verified.更多还原