Abstract
Electrochemical impedance spectroscopy (EIS) is frequently reported to be used in mechanism analysis, state estimation, and fault diagnosis of lithium-ion batteries. For a long time, EIS has been measured in the laboratory using carefully designed equipment, which has the problem of long measurement time and is not convenient for field applications. How to obtain broadband electrochemical impedance spectroscopy quickly and accurately has become a key issue. Being different from the traditional impedance measurement method based on sinusoidal frequency sweep, in this paper, we obtain the EIS by using Fast Fourier Transform (FFT) for maximum length sequence (M-Sequence) excitation current and corresponding response voltage. M-sequence excitation can be generated by fast responding charging and discharging equipment, etc., with higher flexibility. To guide the engineering application, for the first time, the effect of M-Sequence parameters and sampling frequency on the impedance calculation results are investigated through experiments. A series of experimental results show that when given the frequency range to be measured, the parameters of M-Sequence and the sampling frequency can be determined to calculate the EIS quickly and accurately.
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