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Title: Lithium-sulfur dioxide batteriess on Mars Rovers
Authors: Ratnakumar, B. V.
Smart, M. C.
Ewell, R. C.
Whitcananck, L. D.
Kindler, A.
Narayanan, S. R.
Surampudi, S.
Keywords: Mars rovers
Li primary
Li-SO2 batteries
voltage delay
Issue Date: 16-Aug-2004
Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004.
Citation: 2nd International Energy Conversion Engineering Conference, Providence, Rhode Island, August 16-19, 2004.
Abstract: Lithium-sulfur dioxide batteries exhibit voltage delay, which tends to increase at low discharge temperatures, especially after extended storage at warm temperatures. In the absence of a depassivation circuit, as provided on earlier missions, e.g., Galileo, we were required to depassivate the lander primary batteries in a unique manner. The batteries were brought onto a shunt-regulated bus set at preselected discharge voltages, thus affecting depassivation during constant discharge voltage. Several ground tests were performed, on cells, cell strings and battery assembly with five parallel strings, to identify optimum shunt voltages and durations of depassivation. We also examined the repassivation of lithium anodes, subsequent to depassivation. IIn this paper, we will describe these studies, in detail, as well as the depassivation of the lander flight batteries on both Spirit and 0pportunity rovers prior to the EDL sequence and their performance during landing on Mars.
Appears in Collections:JPL TRS 1992+

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