The state of development of individual pressure vessel nickel/hydrogen battery cells is such that they are acceptable for geosynchronous orbit (GEO) applications but for the demanding low-Earth-orbit (LEO) applications, however, the current cycle life at moderate-to-deep depths-of-discharge (DOD) (40 to 80%) should be improved. IPV nickel/hydrogen technology was advanced at NASA Lewis and under Lewis contracts. Some of the advancements are as follows: (i) to use 26% KOH electrolyte to improve cycle life and performance; (ii) to modify the state-of-the-art cell design to eliminate identified failure modes and further improve cycle life; and (iii) to develop a lightweight nickel electrode to reduce battery mass, hence reduce launch and/or increase satellite payload. A breakthrough in the LEO cycle life of individual pressure vessel nickel/hydrogen battery cells was reported. The cycle life of boiler plate cells containing 26% KOH electrolyte was about 40000 accelerated LEO cycles at 80% DOD compared with 3500 cycles for cells containing 31% KOH. Results of the boiler plate cell tests have been validated at Naval Weapons Support Center, USA


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    Title :

    NASA Lewis advanced individual pressure vessel (IPV) nickel/hydrogen technology


    Additional title:

    Entwicklungsfortschritte der NASA-Lewis bei den galvanischen Nickel-Wasserstoff-Sekundärbatterien in Druckkesseln


    Contributors:


    Publication date :

    1994


    Size :

    17 Seiten, 18 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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