Disclosed herein is a secondary battery pack including an anode and cathode terminal of a battery cell, the anode and cathode terminal being made of a plate-shaped conductive member, and being electrically connected to a PCM, a battery cell having the anode and cathode terminal formed at one end thereof, the battery cell being provided at the end thereof with a thermally welded surplus portion, and a PCM including a PCB having a protection circuit formed thereon, the PCB being provided at one side thereof with a cathode and an anode terminal connection portion and at the other side thereof with an external input and output terminal connection portion, an external input and output terminal electrically connected to the protection circuit of the PCB via the external input and output terminal connection portion of the PCB, and an electrically insulative PCM case.