Method for protecting an excess discharge of a battery

Details Method for protecting an excess discharge of a battery Method for protecting an excess discharge of a battery

1997-09-16

1999-01-05

Tso, Edward

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

H01M 1044

Patent

active

058567380

ABSTRACT:
An overcharge or excess discharge of a battery cell can be avoided by an electronic switch formed of a single transistor. A positive electrode of a battery cell (3) is connected to a positive connection terminal (1). A negative electrode is grounded and connected through a transistor (4) to a negative connection terminal (2). When a terminal voltage of the battery cell (3) is a detected to be a predetermined voltage or greater, an output from a detecting circuit (5) is supplied through a series circuit of two resistors (6), (7) and a positive temperature coefficient resistor (PTC) (8) to the base of the single transistor (4) and supplied to power supply terminals of two comparators (9), (10). Further, voltage-divided outputs of two resistors (11), (12) and the negative connection terminal (2) are respectively connected through two resistors (13),(14) to positive and negative input terminals of the comparators (9), (10). The outputs of the comparators (9), (10) are connected through two transistors (15), (16) to a junction between the two resistors (6) and (7). The output from one of the comparators (9) is grounded through a fourth transistor (17) and the base of the fourth transistor (17) is grounded and connected to the connection terminal (2) through two additional resistors (18), (19).

REFERENCES:
patent: 3735233 (1973-05-01), Ringle
patent: 4354148 (1982-10-01), Tada et al.
patent: 4658200 (1987-04-01), Kouge
patent: 5349280 (1994-09-01), Kim
patent: 5539299 (1996-07-01), Fernandez et al.
patent: 5672952 (1997-09-01), Szepesi
International Published Patent Application WO 90/09598 (Nagy), Aug. 1990.
Search and Examination Report, Jul. 26, 1996.

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