Fractional-order dynamics can form physically interpretable equivalent-circuit models (ECMs) of the diffusion overpotential in lithium-ion batteries (LIBs) but have complex formulations in the time domain. Meanwhile, resistor–capacitor circuits have simple implementations but little physical meaning. Thus, we propose a discrete-time state-space diffusion model, named “receding-horizon diffusion” (RHD). It combines physical interpretability with computational simplicity. Analogous to the Warburg element in impedance spectroscopy, the RHD constant is explicitly linked with the lithium-ion diffusion coefficient. Fivefold validation of the RHD model using simulated and experimental from lithium NiMnCo and NiCoAl cells up to 3 C-rate, temperatures from 0 °C to 25 °C, and wide ranges of states of health and charge. The model has less than 1% modeling error. Ohmic, charge-transfer, and diffusion overpotentials are tracked in real time. The RHD model could be integrated into battery management systems (BMSs) in electric vehicles (EVs) and used in standard state estimation techniques.


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    Title :

    Interpretable Real-Time Modeling of the Diffusion Overpotential in Lithium Batteries


    Contributors:


    Publication date :

    2023-09-01


    Size :

    4325941 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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