Diagnostic methods for the evaluation of the state of health (SOH) of NiMH batteries through electrochemical impedance spectroscopy

In this work, we have characterized single nickel metal hydride (NiMH) cells with Electrochemical Impedance Spectroscopy (EIS) technique to determine online the state of the batteries. Studying the variations of the obtained impedance spectra at specific frequencies, which correspond to part of the spectra that change mostly during the charge and discharge processes of the batteries, we have constructed and interpreted diagnostic diagrams through a mathematical model based on Dempster-Schafer Theory of Evidence in order to determine the SOH.

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