| abstract |
The present invention relates to a method of manufacturing a secondary battery, comprising: a formation step of charging the assembled secondary battery to 45% to 65% SOC; An aging step of aging the formed secondary battery; And a low voltage test step of measuring a change in the voltage value, wherein the low voltage test step is characterized in that the voltage value is measured in an SOC of 30% or less. In the method for manufacturing a secondary battery of the present invention, since the SEI film is stably formed, the time required for charging is shortened, thereby securing mass production of the secondary battery. In addition, in the method of manufacturing a secondary battery of the present invention, a low voltage test is performed in a section in which the voltage change rate per capacity of the cathode is large, and thus low voltage defects due to non-uniformity in the formation process are also detected. |