Patent ID: 9091733
Filing Date: 2015-07-28
Classification: G01R,H01M,Y02E,Y02P

Abstract:
1. A method of inspecting a secondary battery, comprising: discharging the secondary battery that has been initially charged, at a given discharge current, from a given initial voltage to a discharge ending voltage; setting a voltage interval, the voltage interval being an interval from a given check starting voltage to a check ending voltage that is lower than the check starting voltage, as a checking interval of an interval capacity of the secondary battery within a voltage range between the initial voltage and the discharge ending voltage, and calculating the interval capacity based on the discharge current, and discharge time it takes for a voltage of the secondary battery to vary from the check starting voltage to the check ending voltage; measuring a voltage change amount as an amount of change in the voltage of the secondary battery from a first point in time at which the voltage of the secondary battery reaches a certain first voltage within the voltage range, to a second point in time at which a given length of time elapses from the first point in time, when the secondary battery is discharged from the initial voltage to the discharge ending voltage; and determining whether a total capacity of the secondary battery having a correlation with the interval capacity satisfies a performance requirement, by comparing the calculated interval capacity with a first threshold value, and determining whether an output of the secondary battery having a correlation with the voltage change amount satisfies a performance requirement, by comparing the measured voltage change amount with a second threshold value.