A Modularized Two-Stage Charge Equalization Converter for Series Connected Lithium-Ion Battery Strings

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This paper proposes a modularized two-stage charge equalization converter for a series-connected lithium-ion battery string. 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
KIPE
Issue Date
2008-07-01
Language
English
Citation

2008년 전력전자학술대회, pp.535 - 537

URI
http://hdl.handle.net/10203/162958
Appears in Collection
EE-Conference Papers(학술회의논문)
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