NDLI: Nickel-hydrogen load sharing test for RNH-90-9 and RNH-76-3 cells

Content Provider	IEEE Xplore Digital Library
Author	Hafen, D.P. Armantrout, J.D. Gordon, D.V. Brown, R.A.
Copyright Year	1997
Description	Author affiliation: Solar Array Center, Lockheed Martin Missiles & Space, Sunnyvale, CA, USA (Hafen, D.P.)
Abstract	The relative performance characteristics and load sharing of two designs of Ni-H/sub 2/ secondary cells in a system with three power channels was studied. Compatibility of the cell designs and achievement of acceptable depths-of-discharge were verified. A bench test was configured with three strings of seven cells in parallel. One string was composed of RNH-90-9 cells, while the other two strings were RNH-763 cells. Two separate sets of electrical cycles were applied, both at 5/spl deg/C (41/spl deg/F), with progressive current step-down as charge control. In the first half of the testing, the electrical cycling consisted of 96-minute cycles repeating after 15-cycles per day were applied. The load applied across the three strings was a constant 350 W, with programmed variations between the cycles using various discharge times and a 700 W discharge pulse which was applied once per day. In the second half of the testing, the same constant 400 W load was applied each cycle. The conclusion of the test is that all cells achieved stable operation in reference to amount of coulombic input/output. Higher recharge ratios were achieved in the second phase of the test. However, probably due to the lower impedance of the RNH-90-9 cells, these cells provided a greater percentage of the total power required. An observation noted was that the RNH-90-9 cells did not reach the temperature-compensated voltage cutoff curve which was developed for the other cell design.
Starting Page	180
Ending Page	185
File Size	379845
Page Count	6
File Format	PDF
ISBN	0780345150
DOI	10.1109/IECEC.1997.659180
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-07-27
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Testing Impedance Electrodes Slurries Space technology Rabbits Missiles Voltage Battery charge measurement Temperature
Content Type	Text
Resource Type	Article

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