Battery capacity calculation device and battery capacity calculation method

A battery capacity calculation device comprising:

• a controller,
• wherein the controller is configured to
• acquire, while a battery is in charge, a first voltage value and a charge current value of the battery,
• acquire, while charging of the battery is in pause, a second voltage value of the battery,
• calculate an impedance value of the battery by using the first voltage value, the second voltage value, and the charge current value,
• calculate an impedance growth that is a ratio of the impedance value to an initial impedance value recorded in a memory in advance,
• acquire a number of cycles of the battery, and
• calculate a full charge capacity of the battery by using the number of cycles and the impedance growth.

A battery capacity calculation method comprising:

• a step of acquiring, while a battery is in charge, a first voltage value and a charge current value of the battery;
• a step of acquiring, while charging of the battery is in pause, a second voltage value of the battery;
• a step of calculating an impedance value of the battery by using the first voltage value, the second voltage value, and the charge current value;
• a step of calculating an impedance growth that is a ratio of the impedance value to an initial impedance value recorded in a memory in advance;
• a step of acquiring a number of cycles of the battery;
• a step of acquiring time until a temperature of the battery falls within a predetermined temperature range and an output voltage value of the battery falls within a predetermined voltage range;
• and
• a step of calculating a full charge capacity of the battery by using the number of cycles, the impedance growth, and the time.

A battery capacity calculation method comprising:

• a step of acquiring, while a battery is in charge, a first voltage value and a charge current value of the battery;
• a step of acquiring, while charging of the battery is in pause, a second voltage value of the battery;
• a step of calculating an impedance value of the battery by using the first voltage value, the second voltage value, and the charge current value;
• a step of calculating an impedance growth that is a ratio of the impedance value to an initial impedance value recorded in a memory in advance;
• a step of acquiring a number of cycles of the battery;
• and
• a step of calculating a full charge capacity of the battery by using the number of cycles and the impedance growth.