BATTERY MONITORING DEVICE, COMPUTER PROGRAM, AND BATTERY MONITORING METHOD

A battery monitoring device includes: a voltage acquisition unit configured to acquire voltages of a plurality of unit cells; a current acquisition unit configured to acquire a charge/discharge current of a secondary battery; a first state-of-charge calculation unit configured to calculate a first state of charge on the basis of a first voltage acquired at a first time at which a predetermined switch is in an OFF state, in a first trip period; a second state-of-charge calculation unit configured to calculate a second state of charge on the basis of a second voltage acquired at a second time at which the predetermined switch is in an OFF state, in a second trip period; a charge/discharge amount calculation unit configured to calculate a charge/discharge amount of the secondary battery from the first time to the second time; a full charge capacity calculation unit configured to calculate a unit full charge capacity of each of the plurality of unit cells on the basis of the first state of charge, the second state of charge, and the charge/discharge amount; and an update unit configured to update a full charge capacity of the secondary battery on the basis of the calculated unit full charge capacity.