A method for diagnosing a battery pack having a configuration in which a plurality of cells are connected in series uses a system for obtaining detected data including the current and temperature of the battery pack and the voltage of each cell. An electric charge capacity and a state of charge (SOC) of each cell is calculated using the current and the temperature, the voltage of each cell, an open circuit voltage (OCV)-SOC function, and an OCV-resistance table. An amount of unbalance, which is an estimated value of the SOC, and the resistance for each cell when the battery pack is fully charged is calculated; and the energy capacity of the battery pack using the electric charge capacity, the amount of unbalance, and the resistances are calculated. As a result, the energy capacity of the battery pack can be calculated accurately, even in an unbalanced state.


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    Title :

    BATTERY PACK DIAGNOSING METHOD, CELL DIAGNOSING METHOD, BATTERY PACK DIAGNOSING DEVICE, AND CELL DIAGNOSING DEVICE


    Contributors:

    Publication date :

    2023-06-29


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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