CAP ASSEMBLY AND SECONDARY BATTERY INCLUDING SAME

A cap assembly includes a cap plate coupled to an open upper end of a case, the cap plate having a first through-hole, and an insulating plate beneath the cap plate, the insulating plate having a second through-hole aligned with the first through-hole, wherein the insulating plate includes a body portion having the second through-hole, a sidewall extending upward along an edge of the body portion, and a bending portion connecting the body portion and the sidewall.