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Method for equalizing capacity of nickel-hydrogen storage battery incorporated in space vehicle. RU patent 2321105.

FIELD: electrical engineering; power supplies for off-line power consumers such as spacecraft.

SUBSTANCE: proposed method for equalizing battery capacity makes use of tight dependence between rate of self-discharge of nickel-hydrogen cells and temperature and is implemented by disconnecting battery and load, its heating and storage at temperature not over 50 °C for time sufficient for complete discharge of all cells, that is, for voltage drop below 0.5 V. Proposed method is characterized in that it wants no special measures for its implementing as it uses heaters incorporated in storage battery.

EFFECT: ability of equalizing capacity of all battery cells dispensing with extra charges for implementing this method.

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IPC classes for russian patent Method for equalizing capacity of nickel-hydrogen storage battery incorporated in space vehicle. RU patent 2321105. (RU 2321105):

H01M10/42 - Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
H01M10/34 - Gastight accumulators
Another patents in same IPC classes:
/ 2319257
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Proposed nickel-hydrogen storage battery operating process involves checkup of steady-state self-discharge current and degree of battery charge against analog pressure transducers, battery storage in charged state with periodic additional charges to compensate for battery self-discharge in solar orbits, and conduction of charge-discharge cycles in shadow orbits; steady-state self-discharge current is maintained in battery between 0.003 and 0.006 of its rated capacity; additional charge is ceased according to arithmetic mean of analog pressure transducer readings whose value affords desired steady-state self-discharge current during additional charge ranging between 0.01 and 0.012 of battery rated capacity under charge-discharge cycle conditions. In addition battery location temperature is checked, and battery self-discharge steady-state current is maintained between 0.003 and 0.006 of rated capacity at battery location temperature below 10-12 °C both in additional-charge mode and during charge-discharge cycles; additional impulse charge is conducted, its parameters (period and relative pulse duration) being chosen to provide for mean charge current higher in magnitude by two or three times than battery steady-state self-discharge current.
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