Battery cell inspection method and battery inspection system

A battery cell inspection method for a battery inspection system which includes a pressing unit configured to press a plurality of battery cells and a charge and discharge (charge/discharge) unit configured to charge and discharge the plurality of battery cells, the method comprising:

• stabilizing the plurality of battery cells by suspending charging of the plurality of battery cells for a predetermined first time period after charging the plurality of battery cells in a first charging method via the charge/discharge unit;
• stabilizing the plurality of battery cells by suspending charging of the plurality of battery cells for a predetermined second time period after charging the plurality of battery cells in a second charging method via the charge/discharge unit;
• measuring Internal Resistance (IR) of the plurality of battery cells when the plurality of battery cells are discharged via the charge/discharge unit;
• and
• determining whether each of the plurality of battery cells is defective by comparing IR measurement values with a representative value of the IR measurement values.

A battery inspection system comprising:

• a charge and discharge (charge/discharge) room configured to respectively accommodate a plurality of battery cells;
• a plurality of channels including connection terminals electrically coupled to the plurality of battery cells;
• a pressing unit configured to press the plurality of channels and the plurality of battery cells in one direction;
• and
• a controller configured to control a current or a voltage applied to the plurality of battery cells via the connection terminals,
• wherein the controller measures Internal Resistance (IR) of the plurality of battery cells when the plurality of battery cells are charged or discharged via the plurality of channels.