A spacecraft carries electric power systems in order to achieve its mission. The practical use of a fuel cell comprising of hydrogen and oxygen as a reactor began in the 1960s. With the development of earth satellites for the purpose of weather observation and communication, greater electric power and longer life were required. A power source, combining solar cells and chemical batteries, was developed. The solar cell comprises N-ON-P thin Si single-crystal of less than 100 to 200 mu m thickness, and is excellent in radiation protection. The battery supplies power to a spacecraft when the sunlight is shaded. However, for a spacecraft on a long mission, entirely sealed type nickel-cadmium battery has been used, which is excellent in cycle life and overcharge protection. Since the 1970s, a study of a new nickel-hydrogen battery using the techniques of fuel cells and electrodes has proceeded intending to provide greater capacity, lighter weight and longer life.


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    Title :

    Electrical power systems on spacecrafts


    Additional title:

    Elektrische Stromversorgungssysteme in Raumfahrzeugen
    Titel japanisch


    Contributors:


    Publication date :

    1989


    Size :

    3 Seiten



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    Japanese




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