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Author: Charles C. Badcock Publisher: ISBN: Category : Languages : en Pages : 20
Book Description
A program to demonstrate the long-term reliability of nickel hydrogen (NiH2) cells in low earth orbit (LEO) and support use in mid-altitude orbit (MAO) has been initiated. Both 3.5 and 4.5 in. diameter NiH2 cells are included in the test plan. Cells from all U.S. vendors are to be tested. The tests will be performed at -5 and 10 C at 40 and 60% depth of discharge (DOD) for LEO orbit and 10 C and 80% DOD for MAO orbit simulations. The goals of the testing are 20,000 cycles at 60% DOD and 30,000 cycles at 40% DOD. Cells are presently undergoing acceptance and characterization testing at Naval Weapons Support Center (NWSC), Crane, Indiana. Funding has been provided by the Air Force Space Technology Center (AFSTC) and two AF System Program Offices (SPO's) to initiate the testing, but additional funding must be acquired to complete the purchase of cells and to assure completion of the testing. Keywords: Battery life, Testing, Nickel hydrogen batteries, Nickel hydrogen cells.
Author: Charles C. Badcock Publisher: ISBN: Category : Languages : en Pages : 20
Book Description
A program to demonstrate the long-term reliability of nickel hydrogen (NiH2) cells in low earth orbit (LEO) and support use in mid-altitude orbit (MAO) has been initiated. Both 3.5 and 4.5 in. diameter NiH2 cells are included in the test plan. Cells from all U.S. vendors are to be tested. The tests will be performed at -5 and 10 C at 40 and 60% depth of discharge (DOD) for LEO orbit and 10 C and 80% DOD for MAO orbit simulations. The goals of the testing are 20,000 cycles at 60% DOD and 30,000 cycles at 40% DOD. Cells are presently undergoing acceptance and characterization testing at Naval Weapons Support Center (NWSC), Crane, Indiana. Funding has been provided by the Air Force Space Technology Center (AFSTC) and two AF System Program Offices (SPO's) to initiate the testing, but additional funding must be acquired to complete the purchase of cells and to assure completion of the testing. Keywords: Battery life, Testing, Nickel hydrogen batteries, Nickel hydrogen cells.
Author: Lawrence H. Thaller Publisher: AIAA ISBN: 9781884989131 Category : Technology & Engineering Languages : en Pages : 212
Book Description
The review and analysis reported here are the outcomes of a project carried out from 1998-2001 within the Energy Technology Department of the The Aerospace Corporation to examine the available results of different nickel-hydrogen life testing programs that had been or were being carried out for low Earth orbit (LEO) applications. The cycling programs, some of which are still in progress, were conducted under different sponsorships and carried out at different testing facilities.
Author: CHarles C. Badcock Publisher: ISBN: Category : Languages : en Pages : 21
Book Description
Both government and industry were surveyed to determine the level of testing of nickel hydrogen (NiH2) battery cells and to evaluate the demonstrable capabilities of the couple. Only flight-type cells undergoing ground test were incorporated in the data base; no boilerplate cells or flight batteries were included. Both USAF-design and COMSAT-design cells, as well as a few cells produced by SAFT, were listed. The USAF design is in test in both high and low-earth-orbit simulations, whereas the COMSAT design, intended specifically for high-orbit applications, is being tested predominantly in high orbits. The data from over 400 cells show that the reliability and capability of both designs for high-orbit applications are reasonably established out to ten years in geosynchronous orbit, and to approximately 3000 cycles in other high-orbit applications. However, the data base is weak and incomplete for applications of the USAF cell in low earth orbit. This results from the harsh testing environment to which these cells have been subjected, as well as from various minor design questions that were not resolved when these cells began testing. It must also be pointed out that most of the testing data base is constructed from cells that were developmental in design or manufacture (all cells purchased for a test are used, even if their performance is questionable), as contrasted to a flight program where it can be assumed that many of the failures listed would have been rejected prior either to life test or their use in a flight battery.
Author: L. Thaller Publisher: ISBN: Category : Languages : en Pages : 24
Book Description
The usable energy density of nickel-hydrogen cells intended for low Earth orbit (LEO) applications can be significantly increased by cycling them to deeper depths of discharge (DODs). In reviewing the existing life cycle databases, the cycle life has been found to vary from less than 1000 cycles to more than 50,000 cycles when cells were cycled to 60% DOD. The causes for this wide disparity occur during the four major phases in a cell's life: (1) design, (2) manufacturing, (3) storage, and (4) life cycle testing. This report will focus on how the conditions selected for life cycle testing can have a significant impact on the usable life of a cell. Cycle life can be significantly reduced when recharge conditions are selected that accelerate the degradation rates of the naturally occurring degradation mechanisms. By paying close attention during the design, manufacturing, and storage phases, cycle lives can be dramatically improved when accompanied by appropriate recharge conditions. The objective of this study is to examine the cycling potential of nickel-hydrogen cells when cycled to 60% DOD.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 602
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Charles C. Badcock
Author: Charles C. Badcock
Author: Lawrence H. Thaller
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Author: CHarles C. Badcock
Author: James D. Dunlop
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Author: Thomas Roy Crompton