基于储能电池电化学阻抗谱宽频测量方法的研究

电化学阻抗谱(EIS)可以较为准确地反应储能电池内部的电化学参数。 为解决传统测量方法耗时长问题,采用了宽频 激励信号测量储能化学电池阻抗信息的方法,并基于 MATLAB-Simulink 仿真平台和 EIS 测量试验平台进行验证,该测量方法将 宽频交流扰动信号注入储能电池,并通过快速傅里叶变换方法分解处理宽频激励和响应信号来获取各频点的电池阻抗信息,以 此大幅节省电池 EIS 的测量时间。 采用两种宽频激励方法测量了电池等效电路模型和储能电池,相较电化学工作站扫频测量 方法,可分别节省 60% 和 78% 的测量时间,且测量结果误差较小。 用宽频激励方法实现电池 EIS 快速测量,可为电池管理系统 的实时诊断和线上检测等更为广阔的应用场景提供技术支撑。

Research on the broadband measurement method based on electrochemical impedance spectrum of energy storage battery

Electrochemical impedance spectroscopy (EIS) can reflect the electrochemical parameters inside the energy storage cell more accurately. To solve the time-consuming problem of traditional measurement methods, a method of measuring impedance information of energy storage battery with broadband excitation signal is adopted and validated by simulation based on MATLAB Simulink platform and EIS measurement test platform. This method injects a broadband AC signal into the battery. Fast Fourier transform decomposition of broadband AC signals is utilized to obtain battery impedance information at each frequency point to significantly reduce the measurement time of electrochemical impedance spectroscopy. In this article, two broadband excitation methods are used to measure the battery equivalent circuit model and the energy storage battery. Compared with electrochemical workstation sweep measurement methods, measurement time can be saved by 60% and 78% , respectively, and the measurement result error is small. The rapid measurement of battery EIS with broadband excitation measurement method can provide technical support for broader application scenarios such as real-time diagnosis and on-line inspection of battery management systems.