A modularized two-stage charge equalization converter for series connected lithium-ion battery strings in an HEV

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This paper proposes a modularized two-stage charge equalization converter for a series-connected lithium-ion battery string in an HEV. In this paper, the series-connected battery sting is modularized into M modules, and each module has K cells in series. With this modularization, low voltage stress on the electronic devices can be achieved. A two-stage dc-dc converter with cell selection switches is employed. The first stage dc-dc converter steps down the high bus voltage to about 10 V. The second stage dc-dc converter integrated with selection switches equalizes the cell voltages. A prototype for 88 lithium-ion battery cells is optimally designed and implemented. Experimental results verify that the proposed equalization method has good cell balancing performance showing low voltage stress, small size, and low cost.
Publisher
IEEE
Issue Date
2008-06-15
Language
ENG
Citation

Power Electronics Specialists Conference, 2008. PESC 2008. IEEE, pp.992 - 997

ISSN
0275-9306
DOI
10.1109/PESC.2008.4592059
URI
http://hdl.handle.net/10203/163017
Appears in Collection
EE-Conference Papers(학술회의논문)
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