Patent ID: 10794960

Abstract:
Disclosed is a technique for effectively detecting a low voltage defect that may occur at a secondary battery.A method for detecting a low voltage defect of a secondary battery includes an assembling step of assembling a secondary battery by accommodating an electrode assembly, in which a positive electrode plate and a negative electrode plate are stacked with a separator being interposed therebetween, and an electrolytic solution in a battery case; a primary aging step of aging the assembled secondary battery at a temperature of 20° C. to 40° C.; a primary formation step of charging the aged secondary battery at a C-rate of 0.1 C to 0.5 C; a high-rate charging step of charging the secondary battery at a C-rate of 2 C or above, after the primary formation step; and a detecting step of detecting a defect of the secondary battery, after the high-rate charging step.