Characteristic leveling method and characteristic leveling apparatus

A characteristic leveling apparatus comprising:

• an identification number assignment unit that assigns identification information to each of a plurality of used secondary batteries;
• a parameter measurement unit that measures intrinsic parameters of the plurality of used secondary batteries;
• a degradation degree calculation unit that calculates degradation degrees of the plurality of used secondary batteries from the intrinsic parameters of the plurality of used secondary batteries and a parameter in a brand-new state of the used secondary battery;
• a target degradation degree determination unit that determines a target degradation degree adapted to the degradation degrees of the plurality of used secondary batteries;
• an aging condition determination unit that determines an aging condition for each of the plurality of used secondary batteries that sets the degradation degrees of the plurality of used secondary batteries as the target degradation degree;
• and
• an aging processing unit that ages the plurality of used secondary batteries according to the aging condition for each of the plurality of used secondary batteries.