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A Study on Developing Intelligent Control System for Charging/Discharging Lithium Secondary Battery Cells With Numerical Impedence Predictions

[+] Author Affiliations
Jung-Su Lee, Kwang-Sun Kim, Jun-young Kim, Hyun-Chan Cho

Korea University of Technology and Education, Cheon-An, Republic of Korea

Geun-Wook Lim

Nexcon Technology Co., Ltd., Republic of Korea

Paper No. IMECE2009-12103, pp. 23-28; 6 pages
doi:10.1115/IMECE2009-12103
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 5: Electronics and Photonics
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4378-9 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

The Lithium secondary battery system needs very high capacity with high effectiveness because the industrial applications have been increased to include a hybrid car, airplanes, and the other aerospace fields, etc. Battery control system will switch off the charging current if one cell has reached full charge for stabilization; this happens due to serial connection and old status of battery cells in order to prevent being over charged and to increase the efficiency of them by keeping the rest of cells from being fully charged. It is a quite important to estimate impedance for state of charge in characteristics of battery cells to set the time to charge the each cell of the battery pack. This paper suggests the method of predicting battery impedance because of aging effects by using numerical simulations, which are verified with the experimental laboratory works. This paper also develops an Intelligent fuzzy control algorithm to maximize the efficiency of the battery cells by keeping the time to charge or discharge each cell of battery pack be more uniform.

Copyright © 2009 by ASME

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