MARKING SYSTEM AND MARKING METHOD FOR IDENTIFYING DEFECT OF ELECTRODE SHEET

A marking system for identifying defects of an electrode sheet according to an embodiment of the present invention performs marking for identifying an electrode sheet including an active material layer coated with an electrode active material and a non-coating portion disposed at one side in a width direction of the active material layer. The marking system for identifying the defects of the electrode sheet may include: a vision sensor configured to detect the defects of the electrode sheet; a heater disposed behind the vision sensor in a moving direction of the electrode sheet, the heater being configured to heat the non-coating portion when the defects are detected by the vision sensor; a marker configured to mark ink on an area corresponding to each of the defect on the non-coating portion heated by the heater; and a blower disposed behind the marker in the moving direction of the electrode sheet to dry the ink on the area.