Patent ID: 9638760
Date: 2017-05-02
CPC Classifications: G01R,H01M,Y02E

Claim:
1. A method for detecting a state of a storage device in which an SOH (State of Health) or an SOC (State of Charge) of the storage device is estimated from an internal impedance thereof, the method comprising: measuring an internal resistance of the storage device using a first signal with a first frequency at which the internal impedance of the storage device decreases as a temperature rises, and calculating an initial SOH or an initial SOC of the storage device from the measured internal resistance; measuring the internal impedance of the storage device using a second signal with a second frequency at which the internal impedance of the storage device increases as the temperature rises, and calculating a value of an internal temperature of the storage device from the measured internal impedance; and estimating the SOH or the SOC using the calculated value of the internal temperature to correct the initial SOH or the initial SOC.