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Method of inspecting secondary battery

  • US 9,091,733 B2
  • Filed: 07/24/2013
  • Issued: 07/28/2015
  • Est. Priority Date: 07/27/2012
  • Status: Active Grant
First Claim
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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.

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