A cap assembly and a battery pack having the same. The cap assembly includes: a cap plate including: a first surface; and a second surface opposite to the first surface, wherein a first hole penetrates through the cap plate from the first surface to the second surface; a first electrode terminal including: an upper terminal on the first surface of the cap plate; a lower terminal on the second surface of the cap plate; and a connection part that connects the upper terminal to the lower terminal through the first hole; a temperature protection device on an upper surface of the upper terminal; and an insulation part interposed between the cap plate and the first electrode terminal and including a first groove. Here, the upper terminal and the temperature protection device are in the first groove.