Device for protecting a secondary battery from overcharge and ov

Details Device for protecting a secondary battery from overcharge and ov Device for protecting a secondary battery from overcharge and ov

1995-12-01

1998-08-04

Tso, Edward

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

320134, 320136, H01M 1046

Patent

active

057899002

ABSTRACT:
A device for protecting a secondary battery from overcharge and overdischarge has two switches and two diodes respectively connected in parallel with the switches. Each diode is conductive in the same direction as a parasitic diode included in the associated switch. When one of the switches is turned off, a current flows through the diode connected to the switch prior to the parasitic diode of the switch. This prevents a current from flowing through the switch in the opposite direction. The switches are, therefore, free from deterioration and damage and allow the protection device to surely operate without being damaged. Alternatively, a charge path and a discharge path may be connected in parallel with each other, and each may have a serial connection of a switch and a diode opposite in direction to a parasitic diode included in the switch. In this case, when one of the switches assigned to the respective paths is turned off, a current flows through the other path prior to the parasitic diode of the switch turned off.

REFERENCES:
patent: 5142215 (1992-08-01), Mathison
patent: 5493197 (1996-02-01), Eguchi et al.
patent: 5635821 (1997-06-01), Smith

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