Patent ID: 9709634
Date: 2017-07-18
CPC Classifications: G01R,H01M,Y02E

Claim:
1. A battery system comprising: a secondary battery capable of charge/discharge; an inspection resistor connected between terminals of the secondary battery via an inspection switch; a pair of external terminals to which a charger that charges the secondary battery is connected; a battery voltmeter for measuring a voltage between both electrodes of the secondary battery; a serially connected magnetic film and a sensor resistor between the terminals of the secondary battery, the magnetic film being arranged close to a connection line between the secondary battery and the external terminals; a sensor voltmeter for measuring a voltage of the magnetic film; a timer for measuring charging time from a state in which a voltage between the electrodes of the secondary battery is a charge start voltage to a state in which the voltage between the electrodes of the secondary battery is a charge end voltage based on a measurement result of the battery voltmeter when the secondary battery is charged; and a control unit for controlling the inspection switch and calculating a remaining power amount of the secondary battery based on a measurement result of the timer and a power consumed by the inspection resistor measured by the sensor voltmeter.