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 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 (PTC) 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 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 (PTC) 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. <EOS>