Patent ID: 8852795

Claim:
A secondary battery, comprising: a bare cell comprising an electrode assembly, a can to receive the electrode assembly, and a cap assembly attached to an opening of the can; a protection circuit board electrically connected to the bare cell; and a molded resin part disposed between the bare cell and the protection circuit board, wherein the cap assembly comprises: a cap plate attached to the opening of the can and having a through-hole formed therein; an electrode terminal extending through the through-hole and comprising pin part extending through the through-hole of the cap plate; and a head part attached to the pin part, having a rectangular shape, and having at least one side that is wider than a diameter of the pin part; and a gasket insulating the electrode terminal from the cap plate and comprising a head-supporting part contacting an entire lower surface of the head part, wherein a gap is disposed between the electrode terminal and an upper surface of the cap plate, and a portion of the molded resin part is disposed in the gap, wherein the gap is formed between a lower surface of the head-supporting part and the upper surface of the cap plate, wherein the cap plate comprises a first attaching groove that at least partially defines the gap, wherein the first attaching groove has an overlapping region which overlaps with a portion of the electrode terminal, wherein the portion of molded resin part is disposed in the overlapping region, and wherein the first attaching groove is spaced away from the through-hole.