Patent ID: 7719237
Filing Date: 2010-05-18
Classification: H02J,H04M

Abstract:
1. A battery pack for a wireless communication terminal comprising: at least one battery cell; and a protective circuit comprising a means for disconnecting power from the battery pack to the wireless communication terminal, wherein the means for disconnecting is responsive to an alarm condition of the at least one battery cell, wherein the means for disconnecting comprises a metal oxide semiconductor field effect transistor (MOSFET) having a gate electrode, wherein the protective circuit further comprises a temperature sensor configured to detect a temperature of the at least one battery cell, a pressure sensor configured to detect a pressure of the at least one battery cell and an indicator component configured to indicate the alarm condition, wherein the temperature sensor is connected in series with a first diode and the pressure sensor is connected in series with a second diode, wherein the first and second diodes and the indicator component are connected directly to a single node connected to the gate electrode of the MOSFET, wherein the MOSFET turns off and the indicator component turns on when either the temperature sensor or the pressure sensor detects the alarm condition.