By A. Zimmerman
Nickel-hydrogen battery cells offer one of many longest-lived and most excellent rechargeable battery platforms ever built. The Aerospace company was once instrumental within the study, improvement, and trying out of such batteries. basically constructed to be used in satellite tv for pc and area strength structures, their tremendously lengthy lifestyles used to be definitely worth the excessive rate linked to the expertise, they usually swiftly changed many of the nickel-cadmium batteries utilized in prior satellites. This publication offers the reader with an in-depth view of nickel-hydrogen phone know-how: the way it used to be built, How and why it really works, the right way to enforce and detect its final power, and What can get it wrong whether it is now not thoroughly managed.
- information and data showing during this e-book are for informational reasons simply. AIAA and the writer should not answerable for any damage or harm because of use or reliance, nor do AIAA and the writer warrant that use or reliance could be unfastened from privately owned rights.
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Sample text
EPIJ had also been working for some years on a single pressure vessel design, which also targeted the large-satellite-constellation market. In 1992 EaglePicher acquired the battery division of Johnson Controls and transferred all the single pressure vessel technology to the Joplin facility. The company possessed the facilities to produce the single pressure vessel batteries in the volume that would be required for large constellations of satellites, and the single pressure vessel battery system could be produced much more rapidly and cheaply than the individual pressure vessel batteries traditionally used in satellites.
6. Variation in typical nickel-hydrogen cell recharge voltage with temperature at a C/lO charge rate. 1 Steady-State Voltage Behavior 43 difference in temperature coefficient for these reactions, which increases the voltage separation between the recharge and overcharge processes, is one reason why nickel-hydrogen cells have significantly improved charge efficiency at reduced temperature. The effect of temperature on discharge voltage at a C/2 discharge rate is shown in Fig. 7, and is not as pronounced as that shown in Fig.
For ManTech cells utilizing Zircar separator, the capacity generally levels off at low temperatures, but does not drop until the temperature falls below -1 0°C. For COMSAT cells, which utilize asbestos separator, the higher impedance of the separator and the electrolyte cause a capacity drop-off at temperatures below 0°C. 10. Variation of nickel-hydrogen cell capacity with temperature for two design types when discharged at a C/2 rate. 3 Cell Capacity Behavior 47 oxygen gas flow through the less permeable asbestos separator.