A secondary battery pack comprising: a battery cell configured to have a structure in which an electrode assembly of a cathode/separator/anode structure is mounted in a battery case together with an electrolyte in a sealed state, the battery case is provided at the top thereof with a first electrode terminal, a second electrode terminal and a pair of coupling grooves (113, 114), a metal clad is attached to the first electrode terminal, and the second electrode terminal protrudes from the center of the top of the battery case; a protection circuit module (PCM: 120) comprising a protection circuit board (PCB: 123) having a protection circuit formed thereon, connection members A and B connected to the first electrode terminal and the second electrode terminal, respectively, and a safety element; and an electrically insulated top cap mounted to the top of the battery cell so as to surround the PCM, the top cap having through holes (133, 134) communicating with the respective coupling grooves (113, 114), wherein one end of the connection member A is coupled to a terminal connection part formed at the bottom of the PCB, a connection portion of the connection member B connected to the second electrode terminal of the battery cell is located at the bottom of the PCB, the PCB being electrically connected to the second electrode terminal via the safety element, coupling members (151, 152) are coupled into the respective coupling grooves (113, 114) of the battery cell through the through holes (133, 134) of the top cap in a state in which the PCM and the top cap are disposed at the top of the battery cell, one end of the connection member A bent perpendicularly, before assembly of the battery pack, to the other end of the connection member A coupled to the terminal connection part formed at the bottom of the PCB being electrically connected to the first electrode terminal by welding, and characterized in that an insulation tape is attached to the bottom of the PCB in a state in which portions of the connection members A and B connected to the electrode terminals (111, 112) of the battery cell are exposed, the PCM and the insulation tape being mounted in the top cap, wherein the insulation tape is attached to the remaining whole portion of the bottom of the PCB excluding the end of the connection member A facing the first electrode terminal and the end of the connection member B facing the second electrode terminal. a battery cell configured to have a structure in which an electrode assembly of a cathode/separator/anode structure is mounted in a battery case together with an electrolyte in a sealed state, the battery case is provided at the top thereof with a first electrode terminal, a second electrode terminal and a pair of coupling grooves (113, 114), a metal clad is attached to the first electrode terminal, and the second electrode terminal protrudes from the center of the top of the battery case; a protection circuit module (PCM: 120) comprising a protection circuit board (PCB: 123) having a protection circuit formed thereon, connection members A and B connected to the first electrode terminal and the second electrode terminal, respectively, and a safety element; and an electrically insulated top cap mounted to the top of the battery cell so as to surround the PCM, the top cap having through holes (133, 134) communicating with the respective coupling grooves (113, 114), wherein one end of the connection member A is coupled to a terminal connection part formed at the bottom of the PCB, a connection portion of the connection member B connected to the second electrode terminal of the battery cell is located at the bottom of the PCB, the PCB being electrically connected to the second electrode terminal via the safety element, coupling members (151, 152) are coupled into the respective coupling grooves (113, 114) of the battery cell through the through holes (133, 134) of the top cap in a state in which the PCM and the top cap are disposed at the top of the battery cell, one end of the connection member A bent perpendicularly, before assembly of the battery pack, to the other end of the connection member A coupled to the terminal connection part formed at the bottom of the PCB being electrically connected to the first electrode terminal by welding, and characterized in that an insulation tape is attached to the bottom of the PCB in a state in which portions of the connection members A and B connected to the electrode terminals (111, 112) of the battery cell are exposed, the PCM and the insulation tape being mounted in the top cap, wherein the insulation tape is attached to the remaining whole portion of the bottom of the PCB excluding the end of the connection member A facing the first electrode terminal and the end of the connection member B facing the second electrode terminal.