Patent ID: 9255972
Filing Date: 2016-02-09
CPC Classification: G01R,H01M,Y02E,Y02P

Claim Text:
1. A method of testing a secondary battery comprising: a first step of charging the secondary battery after manufacture to a first voltage in a constant-current mode; a second step of setting a second voltage lower than the first voltage as a target voltage and performing discharge or charge in a constant-current constant-voltage mode, the second step being performed before the secondary battery is left standing; a third step of measuring a first open circuit voltage of the secondary battery when starting to leave the secondary battery standing and a second open circuit voltage of the secondary battery when a predetermined time is elapsed after starting to leave the secondary battery standing; and a fourth step of determining whether the secondary battery is a conforming item or not based on a difference between the first open circuit voltage and the second open circuit voltage.