Patent ID: 9077189
Filing Date: 2015-07-07
Classification: H02J

Abstract:
1. A battery protection circuit module device, comprising: a charging unit configured to comprise first and second MOSFET switches and to supply externally input power to a battery or a system; a battery protection circuit module configured to comprise the battery, third and fourth MOSFET switches connected in series to a minus terminal of the battery, and configured to be selectively turned on and off under the control of a protection circuit module (PCM) controller so that the battery is selectively and electrically connected to and disconnected from an outside; a resistor and a capacitor configured to detect a voltage of the battery and to supply the voltage of the battery to the PCM controller as driving power; and the PCM controller configured to control the third and fourth MOSFET switches based on a state of the voltage of the battery so that the third and fourth MOSFET switches are selectively turned on and off and thus the battery is selectively charged and discharged; and the system configured to be operated using the voltage of the battery or externally input voltage; wherein the third and fourth MOSFET switches of the battery protection circuit module are connected to each other via a common drain structure and a common drain terminal is connected to an internal ground, so that only the fourth MOSFET switch is turned on upon discharging.