A secondary battery pack comprising: a battery cell having an anode terminal and a cathode terminal formed at one face having a sealed surplus portion; and a protection circuit module (PCM, 400) electrically connected to the battery cell via the anode terminal and the cathode terminal, wherein the PCM comprises: a board having a protection circuit formed thereon, the board being provided with an anode terminal connection part and a cathode terminal connection part connected to the anode terminal and the cathode terminal, respectively; and a PCM case configured to receive the board through an open face thereof so that the PCM case surrounds the board, and the board is coupled to the anode terminal and the cathode terminal of the battery cell via the anode terminal connection part and the cathode terminal connection part and is mounted to the sealed surplus portion of the battery cell, and the board mounted to the sealed surplus portion is disposed in the PCM case, characterised in that the PCM case is coupled to the board from above so that the board is received in the PCM case in a state in which the board is mounted perpendicularly to the sealed surplus portion, wherein the board further comprises an external input and output terminal, and the external input and output terminal is formed at the board at which the anode terminal connection part and the cathode terminal connection part are formed via an interconnection part, and wherein the PCM case further comprises a slit type opening formed at a face adjacent to the open face thereof, and the interconnection part extends through the slit type opening. a battery cell having an anode terminal and a cathode terminal formed at one face having a sealed surplus portion; and a protection circuit module (PCM, 400) electrically connected to the battery cell via the anode terminal and the cathode terminal, wherein the PCM comprises: a board having a protection circuit formed thereon, the board being provided with an anode terminal connection part and a cathode terminal connection part connected to the anode terminal and the cathode terminal, respectively; and a PCM case configured to receive the board through an open face thereof so that the PCM case surrounds the board, and a board having a protection circuit formed thereon, the board being provided with an anode terminal connection part and a cathode terminal connection part connected to the anode terminal and the cathode terminal, respectively; and a PCM case configured to receive the board through an open face thereof so that the PCM case surrounds the board, and the board is coupled to the anode terminal and the cathode terminal of the battery cell via the anode terminal connection part and the cathode terminal connection part and is mounted to the sealed surplus portion of the battery cell, and the board mounted to the sealed surplus portion is disposed in the PCM case, characterised in that the PCM case is coupled to the board from above so that the board is received in the PCM case in a state in which the board is mounted perpendicularly to the sealed surplus portion, wherein the board further comprises an external input and output terminal, and the external input and output terminal is formed at the board at which the anode terminal connection part and the cathode terminal connection part are formed via an interconnection part, and wherein the PCM case further comprises a slit type opening formed at a face adjacent to the open face thereof, and the interconnection part extends through the slit type opening.