Rechargeable battery

A rechargeable battery comprising:

• an electrode assembly including a first electrode, a second electrode, and a separator between the first and second electrodes;
• a case accommodating the electrode assembly;
• a cap plate sealing the case and being electrically connected to the second electrode;
• a first terminal being electrically connected to the first electrode and being located with a terminal hole of the cap plate;
• and
• a second terminal being directly connected to the cap plate, wherein the second terminal comprises:
• a spacing part spaced from the cap plate and a continuous planar exterior surface configured to be entirely connected to a bus bar, wherein the spacing part comprises:
• a first part having a first thickness;
• and
• a second part having a second thickness that is less than the first thickness at either side of the first part in a width direction of the cap plate, and having a concave groove at an inner side, and
• a connection part connected to the spacing part through a round part and connected to the cap plate, wherein a curvature radius of an outer surface of the round part is less than a first thickness of the connection part, and wherein the concave groove of the spacing part is connected to an inner surface of the connection part.