1、Lessons Learned Entry: 0599Lesson Info:a71 Lesson Number: 0599a71 Lesson Date: 1998-08-27a71 Submitting Organization: JPLa71 Submitted by: J. Blosiu/F. Deligiannis/S. DiStefano/D. OberhettingerSubject: In-Flight Management of Rechargeable Batteries (1992) Abstract: Performance problems with NiCd rec
2、hargeable batteries, which drastically affected the lifespan of several military satellites, led JPL to review existing battery management techniques. Optimized in-flight battery management practices were recommended. Also, use of a Taguchi Design Of Experiments approach reduced the number of batter
3、y test conditions from 1,024 to 16.Description of Driving Event: In recent years, performance problems with onboard nickel cadmium (NiCd) rechargeable batteries drastically affected the lifespan of several Department of Defense satellites. NiCd batteries are currently used for an entire class of NAS
4、A observatory spacecraft, including TOPEX, Extreme Ultra-Violet Explorer (EUVE), Upper Atmosphere Research Satellite (UARS), and Gamma Ray Observatory (GRO). NASA postulated that optimizing onboard battery performance could extend the life of these batteries, and thus the potential life of the space
5、craft.JPL was asked to review existing NiCd battery management techniques to determine their effectiveness in achieving optimal flight performance. A ground battery testbed was created to evaluate the operational parameters affecting battery life, including peak charge current and depth-of-discharge
6、 Environmental factors such as battery operating temperature were also considered. Three existing NiCd batteries were evaluated. The experimental protocol made use of the “Taguchi Methods of Robust Design“ techniques and applied them to determine the optimum management of battery operation. Testing
7、 confirmed that a change in battery management practices reduced the cell-to-cell voltage variations (in this case by 96 percent), which significantly improved the performance of this battery type.Reference(s):Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
8、IHS-,-,-1. J. Blosiu, F. Deligiannis, S. DiStefano, “Optimization of Battery Operation Management Using Robust Design.,“ (JPL Technical Paper).Lesson(s) Learned: 1. Optimized in-flight battery management practices can result in significant improvement in performance of rechargeable batteries, such a
9、s NiCd. See the reference or call its author(s) for more detail.2. Use of “Taguchi Methods of Robust Design“ as a Design Of Experiments approach reduced the number of battery test conditions from 1,024 to 16.Recommendation(s): See Lessons Learned above.Evidence of Recurrence Control Effectiveness: N
10、/ADocuments Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Energya71 Research & DevelopmentAdditional Info: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Approval Info: a71 Approval Date: 1998-09-01a71 Approval Name: Carol Dumaina71 Approval Organization: 125-204a71 Approval Phone Number: 818-354-8242Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
