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Soft-short management and remediation in 10-year-old NiCds in Geo orbitAfter 10 years in Geo orbit, during the spring 1993 eclipse season, soft shorts occurred in cells of two of the three batteries on the F2R spacecraft On battery #1, the cell soft short turned suddenly into a hard short; the resulting sudden 1.2V fall in battery voltage and rise in temperature was observed via telemetry. On battery #3, the deleterious impact of its soft short increased day by day, manifesting itself as a drop in battery voltage part-way through each eclipse, causing high loading on the remaining good battery. This paper reports how by planned charge management, including applying (against-the-book) overcharge ratios (C/D) exceeding 1.75, the battery #3 cell soft short was 'built down' until the cell voltage fade ceased. The problem with the battery #3 soft-shorted cell was fought with partial success throughout the latter half of the fall 93 season, and the lessons learned were applied to alleviate the problem during the spring 94 and fall 94 eclipse seasons. The life of the spacecraft was successfully prolonged until it was retired in March 1995.
Document ID
19960020578
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Flordeliza, Nicanor A.
(General Electric Co. Princeton, NJ United States)
Bounds, Ronald W.
(Aerospace Consulting Group, Inc. Princeton, Unknown)
Date Acquired
August 17, 2013
Publication Date
February 1, 1996
Publication Information
Publication: The 1995 NASA Aerospace Battery Workshop
Subject Category
Energy Production And Conversion
Accession Number
96N24127
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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