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Failure analysis of a 3.5 inch, 50 ampere-hour nickel-hydrogen cellThe 3.5 inch, 50 ampere-hour nickel-hydrogen cell was on a Low Earth Orbit (LEO) test regime and was being cycled at 10 C and 60 percent depth of discharge. At cycle number 511 the Automatic Control and Data Acquisition System (ACDAS) terminated the test when the end of discharge voltage dropped below the 1.00 volt cutoff. Upon removal of the stack assembly from the pressure vessel, portions of the zircar separator were found to be completely missing. Upon further examination portions of both the positive and negative plates were found to be missing from its substrate and several gas screens were damaged due to excessive heat which caused fusing. The postulated cause of failure is free electrolyte in the cell which caused oxygen channelization resulting in localized recombination which degraded the stack components.
Document ID
19880001648
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Fuhr, Kenneth H.
(Martin Marietta Aerospace Denver, CO, United States)
Date Acquired
September 5, 2013
Publication Date
September 1, 1987
Publication Information
Publication: NASA Goddard Space Flight Center, Greenbelt, Md. The 1986 Goddard Space Flight Center Battery Workshop
Subject Category
Electronics And Electrical Engineering
Accession Number
88N11030
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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