Circuit for causing a voltage step in a multi-cell battery

Details Circuit for causing a voltage step in a multi-cell battery Circuit for causing a voltage step in a multi-cell battery

1997-07-25

2000-08-22

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

Having variable number of cells or batteries in series

320120, 604 20, H02J 700

Patent

active

061077771

ABSTRACT:
A circuit for causing a voltage step in a battery of a plurality of serially-connected cells is provided. The circuit causes one or more of the cells to discharge through a resistor at a higher rate than the other cells, thus producing a voltage step when the faster discharging cell dies before the other cells. A reverse-biased diode is connected in parallel to the faster discharging cell to cause the current to bypass the faster discharging cell after it has died, thus preventing it from reverse charging. This circuit may be controlled to adjust the higher rate of discharge, and thus the time of occurrence of the voltage step.

REFERENCES:
patent: 4698578 (1987-10-01), Mullersman et al.
patent: 5873850 (1999-02-01), Flower et al.
patent: 5876368 (1999-03-01), Flower
patent: 5982050 (1999-11-01), Matsui
patent: 5982143 (1999-11-01), Stuart

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