Electricity: battery or capacitor charging or discharging – Wind – solar – thermal – or fuel-cell source
Patent
1997-09-11
1999-03-23
Tso, Edward H.
Electricity: battery or capacitor charging or discharging
Wind, solar, thermal, or fuel-cell source
320132, 320136, 136292, H01M 1044
Patent
active
058864997
ABSTRACT:
A method of operating a battery, for example, in a geosynchronous spacecraft is presented for maximizing its service life. According to this method, the energy requirements are determined, specifically those to be satisfied by the battery at a plurality of incremental events over a predetermined operating period as when the spacecraft is in the shadow of the earth. Then, the battery is maintained at a state of charge at least sufficient to satisfy the sum of (i) the energy requirements of the battery at each of the plurality of incremental events and (ii) an energy reserve for the battery in the event of a malfunction of the spacecraft. The charge capacity of the battery is preferably adjusted in a stepwise fashion in accordance with its predetermined energy requirements. By utilizing the invention, the battery is maintained at a full state of charge for less than approximately half of the earlier mentioned predetermined operating period such that the service life of the battery is enhanced.
REFERENCES:
patent: 4820597 (1989-04-01), Lim et al.
patent: 5617006 (1997-04-01), Lenhart et al.
patent: 5698964 (1997-12-01), Kates et al.
Space Systems Loral, Inc.
Tso Edward H.
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