A Modularized Charge Equalizer for an HEV Lithium-Ion Battery String
Hong-Sun Park; Chong-Eun Kim; Chol-Ho Kim; Gun-Woo Moon; Joong-Hui Lee
Industrial Electronics, IEEE Transactions on
Volume 56, Issue 5, May 2009 Page(s):1464 - 1476
Digital Object Identifier 10.1109/TIE.2009.2012456
Summary:Based on the fact that a hybrid electric vehicle (HEV) connects a high number of batteries in series to obtain more than approximately 300 V, this paper proposes a modularized charge equalizer for an HEV battery pack. In this paper, the overall battery string is modularized into M*N cells, where M is the number of modules in the string and N is the number of cells in each module. With this modularization, low voltage stress on the electronic devices can be achieved, which means that there is less chance of a failure on the charge equalizer. The power rating selection is one of the most important design issues for a charge equalizer because it is very closely related to equalization time. To solve this problem optimally, this paper presents a power rating design guide. In addition, this paper considers system-level design issues, such as cell voltage acquisition, equalizer control logic, and system-level grounding. The simulation and experimental results are presented to show the usefulness of the optimal power rating selection guide and the low voltage stressed charge equalization process.
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