The open‐circuit voltage (OCV) of batteries is a crucial characteristic parameter that reflects many aspects of a battery's performance, such as capacity, state‐of‐charge (SOC) and state‐of‐health. OCV is most widely used to determine the SOC when the battery works in a charge‐depleting state. However, the application of the OCV to SOC estimation can be difficult because of the need for a long rest time for full relaxation. In this study, based on the analysis on the curve shape of battery voltage relaxation, a new adaptive model for simulating the voltage relaxation process is developed to predict the final static OCV in a few minutes instead of via the traditional long‐term rest method. Avoiding this disadvantage, the SOC can be deduced from the predicted OCV via the corresponding relationship obtained in a short amount of time. A working condition experiment is performed to validate the new methods and the results are very accurate.


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    Title :

    Relaxation model of the open‐circuit voltage for state‐of‐charge estimation in lithium‐ion batteries


    Contributors:
    Pei, Lei (author) / Lu, Rengui (author) / Zhu, Chunbo (author)

    Published in:

    Publication date :

    2013-12-01


    Size :

    6 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English