METHOD OF DETERMINING APPLICABILITY OF USED SECONDARY BATTERY TO RECONSTITUTED PRODUCT, AND METHOD OF RECONSTITUTING BATTERY-PACK

摘要

PROBLEM TO BE SOLVED: To provide a used secondary-battery applicability determination method of determining whether a used secondary battery is applicable to a reconstituted battery pack.SOLUTION: A used secondary-battery applicability determination method includes: acquiring an AC internal resistance value X of a used secondary battery to be determined; and determining applicability to a reconstituted battery pack including a plurality of secondary batteries, on the basis of a result of comparing the acquired AC internal resistance value X and an AC internal resistance threshold X0 corresponding to an electrolyte amount threshold set in advance for the amount of electrolyte to be held in a separator in the same kind of secondary battery as the used secondary battery.