System and method for accurately determining remaining battery l

Details System and method for accurately determining remaining battery l System and method for accurately determining remaining battery l

1999-04-23

2000-07-11

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

H01M 1044, H01M 1046

Patent

active

060878088

ABSTRACT:
A system for providing an accurate indication of the remaining life of a battery. The system includes a first circuit that provides a control signal. A second circuit employs an internal resistance value of the battery and a battery voltage to provide the indication of remaining battery life in response to the control signal. In a specific embodiment, the second circuit includes a third circuit that measures the internal resistance of the battery in response to the control signal. The third circuit also includes a circuit for measuring an output current and an output voltage of the battery at varying battery loads. The circuit for measuring an output current includes an ammeter and a switching load. In a more specific embodiment, the switching load is implemented as a transmitter that is selectively activated via the control signal. A fourth circuit, included in the second circuit, provides the indication of remaining battery life in response to the internal resistance. The fourth circuit also includes a circuit for selecting a battery discharge curve in accordance with the internal resistance. Software running on the first circuit generates the estimate based on the discharge curve, which is subsequently displayed via a display.

REFERENCES:
patent: 4876513 (1989-10-01), Brilmyer et al.
patent: 5352968 (1994-10-01), Reni et al.
patent: 5635815 (1997-06-01), Whitchurch et al.
patent: 5936383 (1999-08-01), Ng et al.

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