| CPC G01R 31/392 (2019.01) [G01R 31/3842 (2019.01)] | 15 Claims |
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1. A battery diagnosis apparatus, comprising:
a data acquisition unit configured to acquire battery information indicating a time-dependent change history of a terminal voltage and a charge current of a battery for each charge cycle performed a reference number of times for the battery at beginning of life (BOL) according to a Constant Current (CC)-Constant Voltage (CV) charging protocol; and
a control unit configured to calculate an initial CC capacity ratio for each charge cycle performed the reference number of times based on the battery information,
wherein the initial CC capacity ratio in a specific charge cycle is a ratio of a CC charge capacity to a total charge capacity of the battery in the specific charge cycle, and the CC charge capacity is a charge capacity in a CC charging duration according to the CC-CV charging protocol, and
wherein the control unit is configured to:
determine a representative initial CC capacity ratio based on the initial CC capacity ratio for each charge cycle, and
diagnose whether the battery has sign of accelerated degradation by comparing the representative initial CC capacity ratio with a predetermined representative reference CC capacity ratio.
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