Inspection system and inspection method for secondary battery

An inspection system for a secondary battery, the inspection system comprising:

• an image sensor configured to capture an image of a fiber layer of an electrode structure of a secondary battery, the electrode structure comprising an electrode and the fiber layer formed on a surface of the electrode, the electrode comprising a current collector and an active material layer;
• a detector configured to detect a color in data of the image captured with the image sensor;
• and
• an inspection processor configured to inspect a pinhole defect in the fiber layer based on the color detected with the detector, wherein
• the image captured with the image sensor includes a first region of the electrode and a second region of the fiber layer, and
• the inspection processor is configured to:
• set the second region as an inspection region;
• and
• detect a pinhole region having an active-material-layer color of the active material layer in the image in the inspection region, as the pinhole defect,
• the image sensor is configured to scan the electrode structure line by line to capture the image, and
• the inspection processor is configured to:
• set an overlapping region at a boundary between consecutive first and second images obtained by the image sensor;
• determine the pinhole region having the active-material-layer color detected in the overlapping region of the second image as not being the pinhole region of the pinhole defect with a condition where the pinhole region having the active-material-layer color in the overlapping region of the first image corresponds with the pinhole region having the active-material-layer color in the overlapping region of the second image;
• and
• detect, as the pinhole region having the active-material-layer color, a region in which a brightness of blue sub-pixels of the image in the inspection region is equal to or greater than a brightness of red and green sub-pixels.