Apparatus and methods for estimating the state-of-charge of...

Details Apparatus and methods for estimating the state-of-charge of... Apparatus and methods for estimating the state-of-charge of...

2008-07-29

2008-07-29

Tso, Edward (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

Reexamination Certificate

active

07405537

ABSTRACT:
Methods and apparatus are provided for estimating the remaining state-of-charge of a non-rechargeable power source, such as a back-up battery for an electronic module normally connected to a primary power source. A processor within the electronic module implements a prediction algorithm, in order to monitor the temperature of the back-up attery, and to calculate various current draws of the back-up battery. The processor adjusts the nominal self-discharge rate of the back-up battery in accordance with the measured temperatures, and calculates an adjusted self-discharge quantity. The processor also accumulates current draw data and reduces the initial state-of-charge value of the back-up battery by the temperature-adjusted self-discharge quantity and the cumulative current draw quantities to determine a remaining state-of-charge of the back-up battery. At a predetermined state-of-charge threshold level, an indicator can be activated to advise a user to replace the back-up battery.

REFERENCES:
patent: 4484130 (1984-11-01), Lowndes et al.
patent: 4775827 (1988-10-01), Ijntema et al.
patent: 5808445 (1998-09-01), Aylor et al.
patent: 6072299 (2000-06-01), Kurle et al.

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