RECHARGEABLE BATTERY

A rechargeable battery includes: an electrode assembly (200) including a first electrode (11), a second electrode (12), and a separator (13) between the first electrode (11) and the second electrode (12); a case (190) having an opening and housing the electrode assembly (200); and a cap assembly (100) sealing the opening of the case (190), wherein the cap assembly includes: a cap plate (120) bonded to the case (190) and covering the opening; a terminal plate (140) bonded to the cap plate (120); and a thermal fusion member (160) between the terminal plate (140) and the cap plate (120) and thermally fused with the terminal plate (140) and the cap plate (120).