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|1. (WO2018128395) METHOD AND DEVICE FOR CHECKING LOW-VOLTAGE DEFECT IN SECONDARY BATTERY|
|Applicants:||LG CHEM, LTD.
|Title:||METHOD AND DEVICE FOR CHECKING LOW-VOLTAGE DEFECT IN SECONDARY BATTERY|
The present invention provides a technology for effectively detecting a low-voltage defect which may be generated in a secondary battery. A method for checking a low-voltage defect in a secondary battery, according to the present invention, may comprise: an assembling step of assembling a secondary battery by loading, into a battery case, an electrode assembly in which a cathode plate and an anode plate are laminated with a separator interposed therebetween, and an electrolyte; a first aging step of aging the assembled secondary battery at a temperature of 20°C to 40°C; a first formation step of charging the aged secondary battery with a C-rate of 0.1C to 0.5C; a high-rate charging step of charging the secondary battery with a C-rate of 2C or more after the first formation step; and a detecting step of detecting a defect in the secondary battery after the high-rate charging step.