A spiral-wound size C cell was cycled at 25 degrees C in a low Earth orbit regime (LEG) at 50% depth-of-discharge (DOD) with approximately 5% overcharge. The nominal capacity was 3.5 Ah. The cell was cycled for 2000 cycles. Capacity checks and impedance measurements over the complete range of state-of-charge were made upon receipt and after 500, 1000 and 2000 cycles. The capacity of the cell was essentially unchanged until after the impedance measurements at 2000 cycles. Only small changes in the impedance parameters were observed, but there was somewhat more scatter in the data after 2000 cycles. When the cell was returned to LEO cycling after 2000 cycles, only 38% of the capacity could be obtained. It is believed that the cell failed because of an equipment failure at the end of the final impedance measurements which allowed an overdischarge
Impedance measurements on a spiral-wound nickel/metal hydride cell cycled in a simulated low Earth orbit
Langzeitversuch bei Raumfahrtbedingungen zur Messung der Batterieimpedanz und des Lade-Entlade-Verhaltens einer Nickel-Metall-Hydrid-Sekundärzelle
1994
9 Seiten, 8 Quellen
Conference paper
English
galvanische Sekundärbatterie , Nickel , Metalle , Hydrid , Langzeitverhalten , Dauerversuch , Raumfahrttechnik , elektrische Aufladung , Entladungskennlinie , Speichervermögen (galvanisches Element) , Scheinwiderstandsmessung , Systemsimulation , Versuchsergebnis , Systembeschreibung , Weltraumkraftwerk
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