Title :
Effect of design variables on the cycling characteristics of Ni-H 2 cells
Author :
Vaidyanathan, H.
Author_Institution :
Comsat Lab., Clarksburg, MD, USA
Abstract :
The effect of two separate structures, two kinds of electrode stack configurations, and three KOH concentrations on the capacity and voltage characteristics of flight model Ni-H2 cells was investigated. The cells were tested in a low-Earth-orbit (LEO) cycling regime at a depth of discharge of 60% of the measured capacity and 4% overcharge. The current density during discharge was 29 mA/cm2. A group of four cells completed 6000 cycles with no failures. Results indicate that a lower KOH concentration decreases capacity. The discharge voltage is higher for cells with Zircar separator and 31% KOH. The end-of-discharge voltage during cycling is stable for cells with Zircar separator, due to the high electrolyte absorbency of Zircar
Keywords :
hydrogen; nickel; secondary cells; space vehicle power plants; KOH; Ni-H2 cells; Zircar separator; current density; cycling characteristics; depth of discharge; discharge voltage; electrode stack configurations; end-of-discharge voltage; high electrolyte absorbency; low-Earth-orbit; separate structures; Artificial satellites; Batteries; Current density; Electrodes; Fault location; Laboratories; Low earth orbit satellites; Particle separators; Testing; Voltage;
Conference_Titel :
Energy Conversion Engineering Conference, 1989. IECEC-89., Proceedings of the 24th Intersociety
Conference_Location :
Washington, DC
DOI :
10.1109/IECEC.1989.74652
