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Thermal Characterization Study of Lithium-Ion CellsThe primary challenge in designing a full scale lithium-ion (Li-ion) battery system is safety under both normal operating as well as abusive conditions. The normal conditions involve expected charge/discharge cycles and it is known that heat evolves in batteries during those cycles. This is a major concern in the design for high power applications and careful thermal management is necessary to alleviate this concern. An emerging thermal measurement technology, such as the electrochemical calorimetric of batteries, will aid in the development of advanced, safe battery system. To support this technology, several "commercial-off-the-shelf" (COTS) Li-ion cells with different chemistries and designs are being evaluated for different cycling regimes at a given operating temperature. The Accelerated Rate Calorimeter (ARC)-Arbin cycler setup is used to measure the temperature, voltage, and current of the cells at different charge/discharge rates. Initial results demonstrated good cell cyclability. During the cycle testing, the cell exhibited an endothermic cooling in the initial part of the charge cycle. The discharge portion of the cycle is exothermic during the entire discharge period. The presence of an endothermic reaction indicates a significant entropy effect during the beginning of charge cycle. Further studies will be performed to understand the thermal characteristics of the Li-ion cells at the different operating conditions. The effects on the thermal response on cell aging and states-of-charge will also be identified.
Document ID
20070032054
Document Type
Conference Paper
Authors
Britton, Doris L. (NASA Glenn Research Center Cleveland, OH, United States)
Miller, Thomas B. (NASA Glenn Research Center Cleveland, OH, United States)
Bennett, William R. (ASRC Aerospace Corp. Cleveland, OH, United States)
Date Acquired
August 23, 2013
Publication Date
August 23, 2007
Subject Category
Fluid Mechanics and Thermodynamics
Meeting Information
10th Electrochemical Power Sources Symposium(Williamsburg, VA)
Funding Number(s)
WBS: WBS 038957.04.01.02.03.03
Distribution Limits
Public
Copyright
Public Use Permitted.

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