Cells operating at five degrees Celsius or less, and going to 60 to 65 percent depth of discharge, were studied as to whether they could achieve a useful working life of 7.5 years in a GPS orbit. The characteristics of various orbits were compared and it is noted that the GPS orbit experiences only 220 cycles a year and must be treated as a geosynchronous rather than a low Earth orbit. Cell degradation is considered to be the result of both trickle-charge degradation and degradation due to cycling. Time-to-failure values are presented for selected temperatures and depth of discharges.


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    Title :

    Time-to-failure analysis for NiCd batteries in a CPS orbit


    Contributors:


    Publication date :

    1982-03-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




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