Method and System for Detecting Defect in Battery in Formation Process

A method for detecting a defect in a battery in a formation process is disclosed. In some implementations, the method includes: charging or discharging at least one battery cell in the formation process; measuring a pressure in the at least one battery cell or a differentiation (dP/dQ) of the pressure with respect to charge when the at least one battery cell is charged or discharged; and generating data on whether the at least one battery cell has a defect based on the differentiation (dP/dQ).