A secondary battery pack comprising: a battery cell having an electrode assembly of a cathode/separator/anode structure disposed in a battery case together with an electrolyte in a sealed state, the battery cell having first and second electrode terminals formed at a top thereof; an electrically insulative mounting member having an opening, through which the second electrode terminal of the battery cell is exposed, the electrically insulative mounting member being mounted to a top of the battery cell; a protection circuit module (PCM, 130) comprising a protection circuit board (PCB, 133), having a protection circuit, loaded on the electrically insulative mounting member, a connection member (A, 132) connected to a first electrode terminal of the battery cell, and a connection member (B, 136) connected to the second electrode terminal of the battery cell via a safety element, the PCB being provided with a through hole, through which the connection member (B, 136) is exposed; and an insulative cap coupled to an upper end of the battery cell to surround the electrically insulative mounting member in a state in which the connection members (132, 136) and the protection circuit board are loaded on the electrically insulative mounting member, and the second electrode terminal is an anode terminal protruding from a middle of the top of the battery cell, and the first electrode terminal is a cathode terminal formed at the top of the battery cell excluding the anode terminal, characterized in that a sum of a height of the PCM and a height of the insulative cap is 3.0 mm or less, and the safety element is a positive temperature coefficient element, and the PTC element comprises a PTC body, a PCM coupling part coupled to a top of the PTC body, and a battery cell coupling part coupled to a bottom of the PTC body, the PCM coupling part being coupled to the connection member (B, 136) through the through hole of the PCB. a battery cell having an electrode assembly of a cathode/separator/anode structure disposed in a battery case together with an electrolyte in a sealed state, the battery cell having first and second electrode terminals formed at a top thereof; an electrically insulative mounting member having an opening, through which the second electrode terminal of the battery cell is exposed, the electrically insulative mounting member being mounted to a top of the battery cell; a protection circuit module (PCM, 130) comprising a protection circuit board (PCB, 133), having a protection circuit, loaded on the electrically insulative mounting member, a connection member (A, 132) connected to a first electrode terminal of the battery cell, and a connection member (B, 136) connected to the second electrode terminal of the battery cell via a safety element, the PCB being provided with a through hole, through which the connection member (B, 136) is exposed; and an insulative cap coupled to an upper end of the battery cell to surround the electrically insulative mounting member in a state in which the connection members (132, 136) and the protection circuit board are loaded on the electrically insulative mounting member, and the second electrode terminal is an anode terminal protruding from a middle of the top of the battery cell, and the first electrode terminal is a cathode terminal formed at the top of the battery cell excluding the anode terminal, characterized in that a sum of a height of the PCM and a height of the insulative cap is 3.0 mm or less, and the safety element is a positive temperature coefficient element, and the PTC element comprises a PTC body, a PCM coupling part coupled to a top of the PTC body, and a battery cell coupling part coupled to a bottom of the PTC body, the PCM coupling part being coupled to the connection member (B, 136) through the through hole of the PCB.