Coating device, and coating method for non-uniform thickness current collector

A coating device for coating a non-uniform thickness current collector with an active material to form an active material layer, the coating device comprising:

• a thickness sensor configured to detect a thickness change point at a tab area on the non-uniform thickness current collector having a thickness that is unequal to a thickness of a coating area on the non-uniform thickness current collector and output a change point signal;
• an offset correction controller configured to receive the change point signal, compare the change point signal with a predetermined thickness change point signal, determine whether the non-uniform thickness current collector is offset and what an offset direction is, and transmit an offset correction signal;
• an offset correction mechanism configured to receive the offset correction signal and perform an offset correction action on a conveying of the non-uniform thickness current collector in a direction opposite to the offset direction, wherein the offset correction mechanism and the thickness sensor are arranged in sequence along a conveying path of the non-uniform thickness current collector;
• and
• a coating back roller and a coating die head, wherein the conveying path passes by a peripheral surface of the coating back roller, wherein the coating back roller is located downstream of the thickness sensor, and wherein the coating die head faces towards a part of the conveying path on the coating back roller.