Turning now to FIGS. 7A and 7B, FIG. 7A is an oblique view illustrating each of the insulating films 130 attached to the bare cell B by using the jig and FIG. 7B is an exploded oblique view of the insulating film 130 of FIG. 7A. Referring to FIGS. 7A and 7B, the insulating film 130 includes an adhesive surface in order to be attached to the bare cell B, and is provided with a backing paper 140 att