Patent ID: 7964306

Claim:
A lithium rechargeable battery comprising: an electrode assembly; a can containing the electrode assembly; a cap plate coupled to an opening of the can and provided with a terminal through-hole; and an electrode pin inserted into the terminal through-hole, wherein the electrode pin has a flat head including a first surface facing the electrode assembly and a second surface opposite the first surface and exposed outside of the rechargeable battery, the second surface including a first portion being an edge region and a second portion being a central region, a post extending from the first surface of the head, and a protrusion extending from the first portion in a direction away from the first surface to define a groove in the second portion, wherein the protrusion includes an inner edge facing the groove and an outer edge opposite the inner edge, wherein the outer edge of the protrusion is aligned with an edge of the first surface, wherein the protrusion is formed by press processing, wherein a height of the protrusion is equal to or less than about four times a thickness of the head, and wherein the protrusion is formed continuously along an edge of the second surface of the flat head.