10 the insulating film 65 may be made of a polymer material and attached to the flat part 61 in addition a second metal supporting plate 70 includes a flat part 71 facing the other side of the electrode assembly 10 a curved or angled slope part 72 connected to one end of the flat part 71 and curved or angled toward the electrode assembly 10 and a junction part 73 protruding from one end of the curved slope part 72 the flat part 71 may have a quadrilateral shape in one embodiment an insulating film 75 is located between the flat part 71 and the electrode assembly 10 the insulating film 75 may be made of a polymer material and attached to the flat part 71 the junction part 63 of the first metal supporting plate 60 and the junction part 73 of the second metal supporting plate 70 are welded to a negative uncoated region 12 a and thus electrically connected to a negative electrode 12 the first and second metal supporting plates 60 and 70 are made of the same material as a negative electrode current collector and in particular copper or a copper alloy according to an embodiment of the present invention when the metal supporting plates 60 and 70 are located on both sides of the electrode assembly 10 a rechargeable battery may be safer because a current inside an electrode assembly 10 may be discharged without causing fire or an explosion even when the rechargeable battery is pierced by a drill or a similar implement while this disclosure has been described in connection with what is presently considered to be practical exemplary embodiments it is to be understood that the invention is not.