A secondary battery pack comprising: a battery cell array configured to have a structure in which two or more battery cells (112, 116), each of which comprises electrode terminals (113, 114) formed at one side thereof and a thermally bonded surplus portion formed at the side thereof at which the electrode terminals (113, 114) are formed, are arranged side by side; a protection circuit module configured to have a structure including a protection circuit board having a protection circuit formed thereon, an external input and output terminal connected to the protection circuit of the PCB, and a PCM case, in which the PCB is mounted, the PCM being loaded on the thermally bonded surplus portions of the battery cells (112, 116) in a state in which the PCM is electrically connected to the battery cells (112, 116); a cartridge frame comprising two or more battery cell location parts (132, 136) for fixing the two battery cells, respectively, each of the battery cell location parts (132, 136) being formed in a frame shape corresponding to an outer circumference of a corresponding one of the battery cells (112, 116); and a sheathing label attached to the cartridge frame such that the sheathing label wraps the cartridge frame in a state in which the battery cells (112, 116), to which the PCM is connected, are fixed in the cartridge frame, characterized in that each of the battery cells (112, 116) is configured to have a plate-shaped rectangular structure, the battery cells (112, 116) are arranged such that one side of one of the battery cells (112, 116) and one side of another of the battery cells (112, 116) are adjacent to each other in a state in which the electrode terminals (113, 114) of the battery cells are disposed in the same direction, the cartridge frame comprises an outer frame, at which a thermally bonded outer surplus portion positioned at an outer circumference of the battery cell array is mounted, and a partition frame, at which a thermally bonded inner surplus portion of the battery cell array between the battery cells (112, 116) is mounted, and the PCM mounted at the thermally bonded surplus portions of the battery cells cells (112, 116) is securely fixed to the thermally bonded surplus portions of the battery cells (112, 116) by hot melting. a battery cell array configured to have a structure in which two or more battery cells (112, 116), each of which comprises electrode terminals (113, 114) formed at one side thereof and a thermally bonded surplus portion formed at the side thereof at which the electrode terminals (113, 114) are formed, are arranged side by side; a protection circuit module configured to have a structure including a protection circuit board having a protection circuit formed thereon, an external input and output terminal connected to the protection circuit of the PCB, and a PCM case, in which the PCB is mounted, the PCM being loaded on the thermally bonded surplus portions of the battery cells (112, 116) in a state in which the PCM is electrically connected to the battery cells (112, 116); a cartridge frame comprising two or more battery cell location parts (132, 136) for fixing the two battery cells, respectively, each of the battery cell location parts (132, 136) being formed in a frame shape corresponding to an outer circumference of a corresponding one of the battery cells (112, 116); and a sheathing label attached to the cartridge frame such that the sheathing label wraps the cartridge frame in a state in which the battery cells (112, 116), to which the PCM is connected, are fixed in the cartridge frame, characterized in that each of the battery cells (112, 116) is configured to have a plate-shaped rectangular structure, the battery cells (112, 116) are arranged such that one side of one of the battery cells (112, 116) and one side of another of the battery cells (112, 116) are adjacent to each other in a state in which the electrode terminals (113, 114) of the battery cells are disposed in the same direction, the cartridge frame comprises an outer frame, at which a thermally bonded outer surplus portion positioned at an outer circumference of the battery cell array is mounted, and a partition frame, at which a thermally bonded inner surplus portion of the battery cell array between the battery cells (112, 116) is mounted, and the PCM mounted at the thermally bonded surplus portions of the battery cells cells (112, 116) is securely fixed to the thermally bonded surplus portions of the battery cells (112, 116) by hot melting.