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Numerical Analysis of Inner Reaction Effects of Cylindrical Li-Ion Battery by Discharge Rates

[+] Author Affiliations
Kyung-min Jang, Kwang-Sun Kim

Korea University of Technology and Education, Cheonan, South Korea

Paper No. IMECE2011-63610, pp. 975-981; 7 pages
doi:10.1115/IMECE2011-63610
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 4: Energy Systems Analysis, Thermodynamics and Sustainability; Combustion Science and Engineering; Nanoengineering for Energy, Parts A and B
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5490-7
  • Copyright © 2011 by ASME

abstract

The characteristics of the Li-ion batteries are to be assessed by SOC (State of Charge) or SOH (State of Health) and these two factors are found to be dependent on the inner temperatures. However, the most research reports on Li-ion battery performance are focused on the different surrounding temperatures. There are not many reports on effects of battery self-heating together with electro-chemical reaction. In this research we used FEM to analyze the exothermic problem of the Li-ion battery assuming Ohmic heat, reaction heat, and polarization heat. According to the previous reports, the Ohmic heat is the biggest heat source about 54%, the heat of electro chemical reaction is 30%, and the rest of heat source is the polarization heat. The battery in the energy storage system is generally used as a package connecting several cells together. For the connections of several cells, the surface temperature gradient is also different being compared to one cell. And it is figured out that there are considerable differences on battery performances for various discharge rates.

Copyright © 2011 by ASME

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