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Effect of KOH concentration on LEO cycle life of IPV nickel-hydrogen flight cell - Update IIAn update of validation test results confirming the breakthrough in LEO cycle life of nickel-hydrogen cells containing 26 percent KOH electrolyte is presented. A breakthrough in the LEO cycle life of individual pressure vessel (IPV) nickel-hydrogen cells has been previously reported. The cycle life of boiler plate cells containing 26 percent potassium hydroxide (KOH) electrolyte was about 40,000 LEO cycles, compared to 3500 cycles for cells containing 31 percent KOH. The cycle regime was a stressful accelerated LEO, which consisted of a 27.5 min charge followed by a 17.5 min discharge (2X normal rate). The depth-of-discharge was 80 percent. Six 48-Ah Hughes recirculation design IPV nickel-hydrogen flight battery cells are being evaluated. Three of the cells contain 26 percent KOH (test cells), and three contain 31 percent KOH (control cells). They are undergoing real time LEO cycle life testing. The cycle regime is a 90-min LEO orbit consisting of a 54-min charge followed by a 36-min discharge. The depth-of-discharge is 80 percent. The cell temperature is maintained at 10 C. The three 31 percent KOH cells failed (cycles 3729, 4165, and 11355). One of the 26 percent KOH cells failed at cycle 15314. The other two 26 percent KOH cells were cycled for over 16,000 cycles during the continuing test.
Document ID
19920065588
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Smithrick, John J. (NASA Lewis Research Center Cleveland, OH, United States)
Hall, Stephen W. (U.S. Navy, Naval Weapons Support Center Crane, IN, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1992
Publication Information
Publication: IEEE Aerospace and Electronic Systems Magazine
Volume: 7
Issue: 4, Ap
ISSN: 0885-8985
Subject Category
ENERGY PRODUCTION AND CONVERSION
Distribution Limits
Public
Copyright
Other