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    Thermal Aspects of Lithium Ion Cells (2000)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: This viewgraph presentation outlines the development of a thermal model of Li-ion cells in terms of heat generation, thermal mass, and thermal resistance. Intended for incorporation into battery model. The approach was to estimate heat generation: with semi-theoretical model, and then to check accuracy with efficiency measurements. Another objective was to compute thermal mass from component weights and specific heats, and to compute the thermal resistance from component dimensions and conductivities. Two lithium batteries are compared, the Cylindrical lithium battery, and the prismatic lithium cell. It reviews methodology for estimating the heat generation rate. Graphs of the Open-circuit curves of the cells and the heat evolution during discharge are given.
    Keywords: Energy Production and Conversion
    Type: The 1999 NASA Aerospace Battery Workshop; 275-286; NASA/CP-2000-209959
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Lithium-Ion Battery Program Status (1996)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: The objective of this program is to develop rechargeable Li-ion cells for future NASA missions. Applications that would benefit from this project are: new millenium spacecraft; rovers; landers; astronaut equipment; and planetary orbiters. The approach of this program is: select electrode materials and electrolytes; identify failure modes and mechanisms and enhance cycle life; demonstrate Li-ion cell technology with liquid electrolyte; select candidate polymer electrolytes for Li-ion polymer cells; and develop Li-ion polymer cell technology.
    Keywords: Energy Production and Conversion
    Type: The 1995 NASA Aerospace Battery Workshop; 87-110; NASA-CP-3325
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Li-Ion Cell Development for Low Temperature Applications (2000)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: JPL is involved in the development of rechargeable Li-ion cells for future Mars Exploration Missions. The specific objectives are to improve the Li-ion cell cycle life performance and rate capability at low temperature (〈〈-20 C) in order to enhance survivability of the Mars lander and rover batteries. Poor Li-ion rate capability at low temperature has been attributed to: (1) the electrolytes becoming viscous or freezing and/or (2) reduced electrode capacity that results from decreased Li diffusivity. Our efforts focus on increasing the rate capability at low temperature for Li-ion cells. In order to improve the rate capability we evaluated the following: (1) cathode performance at low temperatures, (2) electrode active material particle size on low temperature performance and (3) Li diffusivity at room temperature and low temperatures. In this paper, we will discuss the results of our study.
    Keywords: Energy Production and Conversion
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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