METHOD FOR SELECTING USED SECONDARY BATTERY, AND METHOD OF MANUFACTURING BATTERY PACK

摘要

PROBLEM TO BE SOLVED: To provide a method for selecting a used secondary battery capable of excluding an electrode deteriorated battery from among used secondary batteries, and also to provide a method of manufacturing a battery pack.SOLUTION: Each used secondary battery 100 includes: an internal resistance measuring step (step S4) for measuring a specific internal resistance value (second internal resistance value R2) at a specific battery temperature (second battery temperature); and a selection step (step S5) for selecting the used secondary battery whose specific internal resistance value (second internal resistance value R2) is smaller than a preset threshold Th from a plurality of used secondary batteries 100 measuring the specific internal resistance value (second internal resistance value R2).