BATTERY CELL AND MANUFACTURING METHOD THEREFOR

A battery cell according to an embodiment of the present disclosure includes a first outer packaging including a first metal layer and a resin layer attached to an inner surface of the first metal layer; a second outer packaging including a second metal layer; an electrode assembly housed between the first outer packaging and the second outer packaging; an adhesion portion in which the resin layer and the second metal layer are adhered to each other; a folding portion formed by folding an edge portion of the second outer packaging around an edge portion of the first outer packaging; and a weld portion in which the first metal layer and the second metal layer are welded together in the folding portion.