Rechargeable battery

A battery, comprising:

• an electrode assembly including a positive electrode, a negative electrode, and a separator therebetween;
• a case housing the electrode assembly;
• a cap plate coupled to the case;
• a collector plate coupled to the electrode assembly;
• and
• a terminal coupled to the collector plate and passing through the cap plate, wherein:
• the terminal includes a terminal protrusion and a bottom protrusion,
• the collector plate includes an electrode region coupled to the electrode assembly and a terminal region coupled to the terminal, the terminal region including a combining hole passing therethrough, and
• the bottom protrusion of the terminal:
• has an interengaging, matching shape relative to a shape of the combining hole,
• passes through the combining hole of the collector plate, and
• is welded to a lower surface of the collector plate along an edge of the combining hole, wherein the lower surface of the collector plate includes a protruded region that surrounds the combining hole, the combining hole passing through the protruded region;
• wherein the combining hole has a length and a width, the length of the combining hole being greater than the width.