Patent ID: 6051956
Filing Date: 2000-04-18
Classification: H01M,H02J,Y02E

Abstract:
A rechargeable battery pack comprising:a rechargeable secondary battery connectable in use to an external device;an overcharging/overdischarging-and-overcurrent control circuit connected to the secondary battery for detecting at least one of a voltage across the secondary battery and a current through the secondary battery and for outputting an indicating signal when the secondary battery is in one of a first state in which the secondary battery is approaching one of an overcharged state, an overdischaraed state and an overcurrent state and a second state in which the secondary battery is in one of an overcharged state, an overdischarged state and an overcurrent state;a switch circuit connected to the overcharging/overdischarging-and-overcurrent control circuit for selectively disconnecting the rechargeable secondary battery from the external device based on the indicating signal of the overcharging/overdischarging-and-overcurrent control circuit; andmeans for outputting a pre-end signal shortly before the switch circuit disconnects the rechargeable secondary battery from the external device to thereby enable a task to be performed before the secondary battery is disconnected from the external device.