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.
BATTERY PACK DIAGNOSING METHOD, CELL DIAGNOSING METHOD, BATTERY PACK DIAGNOSING DEVICE, AND CELL DIAGNOSING DEVICE
2023-06-29
Patent
Electronic Resource
English
European Patent Office | 2024
|European Patent Office | 2024
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|European Patent Office | 2022
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