METHOD FOR MANUFACTURING BATTERY MODULE AND BATTERY MODULE

摘要

This method for manufacturing a battery module comprises: charging each of a plurality of secondary battery unit cells; carrying out a first aging; carrying out a first voltage measurement that measures a first voltage after the first aging; carrying out a second aging after the first voltage measurement; carrying out a second voltage measurement that measures a second voltage after the second aging; calculating the difference between the first voltage and the second voltage as an amount of voltage reduction; classifying the plurality of unit cells into a plurality of groups based on the amounts of voltage reduction; and manufacturing a battery module that includes a plurality of unit cells classified into each group of the plurality of groups.