By L. Thaller, A. Zimmerman
The assessment and research said listed below are the results of a venture performed from 1998-2001 in the strength know-how division of the The Aerospace company to envision the on hand result of varied nickel-hydrogen lifestyles checking out courses that were or have been being performed for low Earth orbit (LEO) purposes. The biking courses, a few of that are nonetheless in development, have been carried out below assorted sponsorships and performed at diverse trying out facilities.
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Additional resources for Nickel-Hydrogen Life Cycle Testing - Review and Analysis
The test matrix for this study was made up of a large number of cells of the same design that were cycled under very controlled conditions. The results 18 Review of LEO Cycling Data have significant implications regarding the effects of small changes in RR on the cycle life of nickel-hydrogen cells. This information will be very helpful in the specification of the recharge protocol for spacecraft still in the design phase. The results will also suggest appropriate values for the RR to be used with orbiting spacecraft to ensure long cycle life.
7. Cycling information from cells in test pack 3865G. circuits. Cycling conditions at this temperature and DOD are usually not associated with any capacity walkdown. These observations suggested that there was a problem with the positive electrodes. Either the discharged material could no longer be charged or the charged material could no longer be discharged. 3). With this information as background, the posttest analysis carded out in our Aerospace laboratory focused on the characteristics of the nickel electrodes.
2 . ¢) . 1 . m ,, . i .......... t 4, . '-.... Cycle 500 Cycle 1700 . . . . Cycle 6000 I .... Cycle 10,500 I t 10 ~ ,~-- %1 0 i l l ....... 9 Igllll 40 50 60 Cycle time (min) 70 80 90 Fig. 2. 1. 6, a large increase in "residual" capacity occurred as a result of cycling. 1 for details of this technique) obtained at Aerospace are included in this table and confirm the information as reported by Crane. 6. 0 V Total Cap New ce11--65 Ah nameplate 80 Ah 84 Ah Cell at end of cycling 54 Ah 74 Ah Cell prior to DPA Plate pair in flooded test 48 Ah - 71 Ah 71Ah 53 Ah 70 Ah 1 cm 2 flooded utilization a 40 Ah 52 Ah Utilization a 72% 84% 88% 112% Estimate of a new plate 80% 90% 100% 120% aFrom DPA studies done at Aerospace and prorated to the capacity of the entire 48-plate cell.
Nickel-Hydrogen Life Cycle Testing - Review and Analysis by L. Thaller, A. Zimmerman