Overcharge preventing device and overdischarge preventing device

Details Overcharge preventing device and overdischarge preventing device Overcharge preventing device and overdischarge preventing device

1992-04-24

1994-04-19

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 13, 320 40, H02J 700

Patent

active

053049152

ABSTRACT:
An overcharge preventing device and an overdischarge preventing device for a nonaqueous electrolyte secondary battery having voltage detectors and are provided to respectively detect terminal voltages of batteries connected in series. A switch is provided in series to the batteries between a common terminal and a charge terminal. When the terminal voltage of at least one of the batteries exceeds a battery design voltage in charging the batteries, the switch is turned off in response to an output from the corresponding voltage detectors, thereby cutting off a charging current. Further, a voltage detector is provided to detect a terminal voltage of the series connected batteries. A switch is provided in series to the batteries between the common terminal and a discharge terminal. When the terminal voltage of the batteries becomes equal to or less than a set voltage in discharging the batteries, the switch is turned off in response to an output from the voltage detector, thereby cutting off a discharging current.

REFERENCES:
patent: 3543043 (1970-11-01), Dunn
patent: 4086525 (1978-04-01), Ibsen et al.
patent: 4237385 (1980-12-01), Jurgens et al.
patent: 4571531 (1986-02-01), Lin
patent: 4583035 (1986-04-01), Sloan
patent: 4622508 (1986-11-01), Matteau et al.
patent: 5028858 (1991-07-01), Schnizler et al.
patent: 5153496 (1992-10-01), Laforge
patent: 5179337 (1993-01-01), Staarman et al.
Soviet Inventions Illustrated Section El in Week 8426, Aug. 8, 1984 published by Derwent Publications Ltd. pp. 12-13.
Soviet Inventions Illustrated, Section E1 Week D51, Feb. 3, 1982 published by Derwent Publications Ltd. p. 4.

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