A method of manufacturing a battery pack comprising a battery cell having an electrode assembly received in a battery case, made of a laminate sheet comprising a resin layer and a metal layer, together with an electrolytic solution, the method comprising: (a) electrically connecting electrode terminals of the battery cell to electrode terminal connection parts of a protection circuit board having a connector and a protection circuit formed thereon, the battery cell comprising, at one of its sealed outer edges surrounding the outer circumference of the battery cell formed when the electrode assembly is mounted in the battery case in the sealed state, an upper sealed portion at which the electrode terminals are located; (b) coupling an upper case to an upper part of the PCB; (c) bending the upper sealed portion of the battery cell and loading the PCB, to which the upper case has been coupled, on an upper end of the battery cell such that the PCB is parallel to an outer wall of an electrode assembly receiving part of the battery cell and such that the connector protrudes upward; (d) placing in a mold (210, 220) the upper case, the PCB and the battery cell which have been coupled to each other, which mold (210, 220) is provided, in regions thereof corresponding to a peripheral edge of the battery cell to be formed, with two or more injection ports through which a hot-melt resin is injected; (e) injecting a hot-melt resin through the injection ports to perform a hot-melt process, in which the hot-melt resin fills a space defined between the upper case, the PCB, the battery cell and the mold to form the peripheral edge; and (f) removing from the mold (210, 220) the resultant battery pack comprising the formed peripheral edge. (a) electrically connecting electrode terminals of the battery cell to electrode terminal connection parts of a protection circuit board having a connector and a protection circuit formed thereon, the battery cell comprising, at one of its sealed outer edges surrounding the outer circumference of the battery cell formed when the electrode assembly is mounted in the battery case in the sealed state, an upper sealed portion at which the electrode terminals are located; (b) coupling an upper case to an upper part of the PCB; (c) bending the upper sealed portion of the battery cell and loading the PCB, to which the upper case has been coupled, on an upper end of the battery cell such that the PCB is parallel to an outer wall of an electrode assembly receiving part of the battery cell and such that the connector protrudes upward; (d) placing in a mold (210, 220) the upper case, the PCB and the battery cell which have been coupled to each other, which mold (210, 220) is provided, in regions thereof corresponding to a peripheral edge of the battery cell to be formed, with two or more injection ports through which a hot-melt resin is injected; (e) injecting a hot-melt resin through the injection ports to perform a hot-melt process, in which the hot-melt resin fills a space defined between the upper case, the PCB, the battery cell and the mold to form the peripheral edge; and (f) removing from the mold (210, 220) the resultant battery pack comprising the formed peripheral edge.