A protection circuit module (PCM) integrated cap assembly includes a cap plate including an electrically conductive material and defining a through hole passing from a first surface of the cap plate to a second surface of the cap plate, a wiring unit including an electrically conductive material and a circuit pattern, and facing the first surface of the cap plate, wherein a first edge of the wiring unit is electrically coupled to the cap plate, and wherein a second edge of the wiring unit extends through the through hole of the cap plate a first insulating unit in a space of the circuit pattern a second insulating unit between the second edge of the wiring unit and a portion of the cap plate defining the through hole, and at least one electrical component coupled to the circuit pattern.