SECONDARY BATTERY ACTIVATION METHOD WITH ENHANCED ABILITY TO DETECT LOW VOLTAGE

The present invention relates to a secondary battery activation method comprising: a pre-aging step (S100) for aging, at room temperature, a secondary battery comprising a positive electrode comprising a positive electrode active material, a negative electrode comprising a negative electrode active material, a separator disposed between the positive electrode and the negative electrode, and an electrolyte; a charging step (S200) for primarily charging the pre-aged secondary battery to a secondary battery capacity (SOC) of 60% or more; a high-temperature aging step (S300) for aging the primarily charged secondary battery at a high temperature; and a room-temperature aging step (S400) for aging, at room temperature, the secondary battery which has been aged at a high temperature, wherein the high-temperature aging step is performed at a temperature of 60 °C or higher. The activation method of the present invention has, by uniformly and stably forming a negative electrode SEI film by primary charging and accelerating the stabilization of the SEI film through high-temperature aging to thereby reduce the voltage drops of good products and improve the variation thereof, the effect of enhancing the ability to detect low-voltage defects.