Secondary battery

A secondary battery (100) including an electrode assembly (110), the electrode assembly including a first electrode plate (111), a second electrode plate (112), and a separator (113) between the first electrode plate and the second electrode plate; a first collecting plate (120) electrically connected to the first electrode plate (111), the first collecting plate including a first fuse region (Sf1); a second collecting plate (130) electrically connected to the second electrode plate (112), the second collecting plate including a second fuse region (Sf2); and a case (140) accommodating the electrode assembly, the first collecting plate, and the second collecting plate, wherein a first sectional area of the first fuse region (Sf1) is larger than a second sectional area of the second fuse region (Sf2).