SECONDARY BATTERY AND A BATTERY MODULE INCLUDING THE SAME

A secondary battery includes a case, an electrode assembly accommodated in the case, the electrode assembly including a winding of a first electrode, a second electrode, a separator interposed between the first electrode and the second electrode, and a tape surrounding an outermost portion of the electrode assembly along a winding direction, the tape comprising a first protrusion portion protruding in a first direction toward a top of the electrode assembly and a second protrusion portion connected to the first protrusion portion, the second protrusion portion protruding in a second direction toward a bottom of the electrode assembly, wherein the first protrusion portion and the second protrusion portion are alternated, an inner side of the first protrusion portion is positioned above a reference line, and an inner side of the second protrusion portion is positioned below the reference line, and the reference line divides the tape in a width direction.