CPC H02J 7/0049 (2020.01) [H02J 7/00302 (2020.01); H02J 7/00716 (2020.01); H02J 7/007182 (2020.01)] | 10 Claims |
1. An estimation system, comprising:
a memory;
a secondary battery configured to be charged using electric power supplied from an external power source;
a monitoring device configured to detect a voltage and a current of the secondary battery; and
a processor programmed to estimate a full charge capacity of the secondary battery using a detection result of the monitoring device, wherein the processor is programmed to:
retrieve a previously estimated full charge capacity of the secondary battery determined from a previous charge cycle that is stored in the memory;
calculate a first charging rate of the secondary battery using a current integration amount in charging, discharging, or charging and discharging of the secondary battery and using the previously estimated full charge capacity of the secondary battery;
calculate a second charging rate of the secondary battery using an open circuit voltage of the secondary battery, when a predetermined time has elapsed without charging and discharging after the first charging rate is calculated; and
perform correction, when a magnitude of a difference between the first charging rate and the second charging rate is larger than a threshold, on the full charge capacity based on the difference.
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