A secondary battery includes: a case; an electrode assembly in the case and comprising a first electrode plate on which a first base tab is located at a first end in a longitudinal direction of the case, a second electrode plate on which a second base tab is located at a second end in the longitudinal direction of the case, and a separator between the first electrode plate and the second electrode plate; and a cap assembly coupled to the case, and comprising a pair of collectors electrically connected to the first base tab and the second base tab, respectively, wherein the first base tab and the second base tab are laser welded to the collectors.