A battery pack comprising: a battery cell having a curved surface; and a pack housing having a curved surface, the pack housing having a battery cell receiving space corresponding to the curved surface of the battery cell to prevent occurrence of a spring back phenomenon of the battery cell and to prevent change in curvature of the battery cell due to external impact, the pack housing being preferably made of a metal or a polymer resin, the pack housing comprising: - a curved upper plate (211, 212, 213, 214, 215, 216) facing a top of the battery cell; - a curved lower plate (221, 222, 223, 224, 225) facing a bottom of the battery cell; and - side plates (231, 232, 233, 234) connected or coupled to the upper plate or the lower plate to form a curved receiving space, the side plates facing side walls of the battery cell, two or more of the side plates being curved (231, 232). the battery cell comprising: an electrolyte; an electrode assembly having a curved stacked surface of a cathode, an anode, and a separator; electrode leads connected to electrode tabs of the electrode assembly; and a battery case having the electrolyte and the electrode assembly received in a receiving part having a curved surface corresponding to the curved surface of the electrode assembly, an opening of the battery case being sealed in a state in which the electrode leads are exposed outward, the battery case being preferably made of a laminate sheet comprising a metal layer and a resin layer, more preferably an aluminum laminate sheet, the battery case having one or more outer circumferential sealed portions (131, 132, 133) bent toward an outer wall of the receiving part excluding another outer circumferential sealed portion from which the electrode leads (111, 112) are exposed outward, in which the electrode leads are preferably bent toward the unbent outer circumferential sealed portion, characterized in that the upper plate and/or the lower plate is a window frame. a battery cell having a curved surface; and a pack housing having a curved surface, the pack housing having a battery cell receiving space corresponding to the curved surface of the battery cell to prevent occurrence of a spring back phenomenon of the battery cell and to prevent change in curvature of the battery cell due to external impact, the pack housing being preferably made of a metal or a polymer resin, the pack housing comprising: - a curved upper plate (211, 212, 213, 214, 215, 216) facing a top of the battery cell; - a curved lower plate (221, 222, 223, 224, 225) facing a bottom of the battery cell; and - side plates (231, 232, 233, 234) connected or coupled to the upper plate or the lower plate to form a curved receiving space, the side plates facing side walls of the battery cell, two or more of the side plates being curved (231, 232). - a curved upper plate (211, 212, 213, 214, 215, 216) facing a top of the battery cell; - a curved lower plate (221, 222, 223, 224, 225) facing a bottom of the battery cell; and - side plates (231, 232, 233, 234) connected or coupled to the upper plate or the lower plate to form a curved receiving space, the side plates facing side walls of the battery cell, two or more of the side plates being curved (231, 232). the battery cell comprising: an electrolyte; an electrode assembly having a curved stacked surface of a cathode, an anode, and a separator; electrode leads connected to electrode tabs of the electrode assembly; and a battery case having the electrolyte and the electrode assembly received in a receiving part having a curved surface corresponding to the curved surface of the electrode assembly, an opening of the battery case being sealed in a state in which the electrode leads are exposed outward, an electrolyte; an electrode assembly having a curved stacked surface of a cathode, an anode, and a separator; electrode leads connected to electrode tabs of the electrode assembly; and a battery case having the electrolyte and the electrode assembly received in a receiving part having a curved surface corresponding to the curved surface of the electrode assembly, an opening of the battery case being sealed in a state in which the electrode leads are exposed outward, the battery case being preferably made of a laminate sheet comprising a metal layer and a resin layer, more preferably an aluminum laminate sheet, the battery case having one or more outer circumferential sealed portions (131, 132, 133) bent toward an outer wall of the receiving part excluding another outer circumferential sealed portion from which the electrode leads (111, 112) are exposed outward, in which the electrode leads are preferably bent toward the unbent outer circumferential sealed portion, characterized in that the upper plate and/or the lower plate is a window frame.