Disclosed herein is a top cap assembly mounted to 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 case being provided at an upper end thereof with a first electrode terminal and a second electrode terminal, the top cap assembly including a protection circuit module (PCM) and an electrically insulative top cap housing mounted to the upper end of the battery cell while surrounding an outside of the PCM, wherein the PCM includes a protection circuit board (PCB) having a protection circuit formed thereon, the PCB being coupled to a mechanical coupling part of a terminal block, connecting parts connected to the first electrode terminal and the second electrode terminal, a safety element, and the terminal block mounted to the PCM, the terminal block including connectors.
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