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International Space Station Nickel-Hydrogen Battery On-Orbit PerformanceInternational Space Station (ISS) Electric Power System (EPS) utilizes Nickel-Hydrogen (Ni-H2) batteries as part of its power system to store electrical energy. The batteries are charged during insolation and discharged during eclipse. The batteries are designed to operate at a 35 percent depth of discharge (DOD) maximum during normal operation. Thirty-eight individual pressure vessel (IPV) Ni-H2 battery cells are series-connected and packaged in an Orbital Replacement Unit (ORU). Two ORUs are series-connected utilizing a total of 76 cells to form one battery. The ISS is the first application for low earth orbit (LEO) cycling of this quantity of series-connected cells. The P6 (Port) Integrated Equipment Assembly (IEA) containing the initial ISS high-power components was successfully launched on November 30, 2000. The IEA contains 12 Battery Subassembly ORUs (6 batteries) that provide station power during eclipse periods. This paper will discuss the battery performance data after eighteen months of cycling.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Dalton, Penni
(NASA Glenn Research Center Cleveland, OH United States)
Cohen, Fred
(Boeing Co. Canoga Park, CA United States)
Date Acquired
September 7, 2013
Publication Date
July 1, 2002
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
NAS 1.15:211721
Meeting Information
Meeting: 37th Intersociety Energy Conversion Engineering Conference
Location: Washington, DC
Country: United States
Start Date: July 28, 2002
End Date: August 2, 2002
Sponsors: Electron Devices Society
Funding Number(s)
PROJECT: RTOP 478-29-10
Distribution Limits
Work of the US Gov. Public Use Permitted.
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