Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Patent
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.
Brown Charles D.
Hom Raymond B.
Tso Edward H.
Wadsworth Philip R.
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