The present invention provides a secondary battery pack comprising a battery cell in which a pair of coupling grooves are formed to a predetermined depth, an insulating member mounted on the top surface of the battery cell, a protection circuit module (PCM) having a pair of connection members that protrude downwardly, and an insulating cap coupled onto the top surface of the battery cell. The connection members penetrate through an opening of the insulating member, and are inserted into the coupling grooves of the electrode terminals of battery cells when the insulating member is mounted on the top surface of the battery cell, thereby coupling the PCM to the battery cell and the insulating member, and electrically connecting the battery cell and the PCM.