Electrochemical impedance spectroscopy (EIS) has received extensive attention because it can reflect the electrochemical mechanism of a battery and is one of the important references for evaluating the health status of a battery. EIS is usually obtained by sinusoidal scanning in the laboratory through professional equipment, making it hardly accessible in the actual vehicle application. This study presents a high-power impedance test system based on a full-bridge converter capable of being compatible with a battery management system (BMS). The experimental results show that the developed test system can accurately measure the EIS of a cylindrical 18650 battery with a capacity of 3.5 Ah, a pouch battery with a capacity of 10 Ah, and a prismatic battery with a capacity of 50 Ah over the frequency range of 0.1–800 Hz. Their overall measurement error is less than 3%. The hardware implementation of the test system is simple, which can provide a feasible on-board impedance measurement. In addition, the test system shows good adaptability and accuracy for the EIS measurement of battery packs.


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    Title :

    Electrochemical Impedance Spectroscopy: A Novel High-Power Measurement Technique for Onboard Batteries Using Full-Bridge Conversion


    Contributors:
    Zhang, Kui (author) / Xiong, Rui (author) / Qu, Siyu (author) / Zhang, Boran (author) / Shen, Weixiang (author)

    Published in:

    Publication date :

    2024-12-01


    Size :

    13985684 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English