SET BATTERY MANUFACTURING METHOD, AND SET BATTERY

摘要

Provided are a set battery manufacturing method, which can prevent a drawback that a portion of a used secondary battery constituting a set battery prematurely comes to the end and which can suppress the enlargement of the temporary voltage difference of the used secondary battery at a charging/discharging time (especially under a low-temperature circumstance), and a set battery. The set battery manufacturing method comprises an acquisition step (Step S1) of acquiring the individual internal resistances of the secondary batteries already used, a selection step (Step S2) of selecting a plurality of such ones of the group of the used secondary batteries having the acquired internal resistances as have internal resistances close to each other, and an assembling step (Step S3) of combining the used secondary batteries selected, to constitute the set battery.