CAP ASSEMBLY, SECONDARY BATTERY INCLUDING SAME, AND METHOD FOR MANUFACTURING CAP ASSEMBLY

A cap assembly including a cap plate including a through hole and a coating layer on at least a portion of an upper surface of the cap plate, a terminal plate including a body part and an inserting part, the inserting part protruding from the body part and into the through hole, an insulator between the cap plate and the terminal plate, and a filler between the inserting part and at least one of the insulator and the cap plate.