Side surface inspection device of cylindrical battery

A side surface inspection device for a cylindrical battery that has a first area that is a part of a side surface, a second area that is another part of the side surface, a third area that is still another part of the side surface, and a fourth area that is a remaining part of the side surface, the first area, the second area, the third area, and the four area being adjacent to each other and arranged sequentially along a circumference, the side surface inspection device comprising:

• a first light configured to emit light in a direction toward the side surface of the cylindrical battery;
• a plurality of mirrors including a first mirror, a second mirror, a third mirror, and a fourth mirror that each are configured to reflect light emitted from the first light to be incident on each of the first area, the second area, the third area, and the fourth area, respectively, of the cylindrical battery, and are configured to reflect light reflected by each of the first area, the second area, the third area, and the fourth area, respectively, of the cylindrical battery;
• and
• a camera configured to receive the light reflected by each of the plurality of mirrors and configured to form an image including images of the first area, the second area, the third area, and the fourth area of the cylindrical battery.