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Open AccessFeature PaperArticle

Cell Voltage Equalizer Using a Selective Voltage Multiplier with a Reduced Selection Switch Count for Series-Connected Energy Storage Cells

College of Engineering, Ibaraki University, Hitachi 316-8511, Japan
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Electronics 2019, 8(11), 1303; https://doi.org/10.3390/electronics8111303
Received: 26 September 2019 / Revised: 23 October 2019 / Accepted: 2 November 2019 / Published: 7 November 2019
(This article belongs to the Special Issue Challenges of Battery Management System)
Cell voltage equalization is mandatory to eliminate voltage imbalance of series-connected energy storage cells, such as lithium-ion batteries (LIBs) and electric double-layer capacitors (EDLCs), to ensure years of safe operations. Although a variety of cell equalizers using selection switches have been proposed, conventional techniques require numerous switches in proportion to the cell count and are prone to complexity. This paper proposes a novel cell voltage equalizer using a selective voltage multiplier. By embedding selection switches into the voltage multiplier-based cell voltage equalizer, the number of selection switches can be reduced in comparison with that in conventional topologies, realizing the simplified circuit. A prototype for twelve cells was built, and an equalization test using LIBs was performed. The voltage imbalance decreased down to approximately 20 mV by the proposed equalizer, and the standard deviation of cell voltages at the end of the equalization test was as low as 10 mV, demonstrating its equalization performance. View Full-Text
Keywords: electric double-layer capacitor (EDLC); equalization; lithium-ion battery (LIB); selection switch; voltage imbalance electric double-layer capacitor (EDLC); equalization; lithium-ion battery (LIB); selection switch; voltage imbalance
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Uno, M.; Ueno, T.; Yoshino, K. Cell Voltage Equalizer Using a Selective Voltage Multiplier with a Reduced Selection Switch Count for Series-Connected Energy Storage Cells. Electronics 2019, 8, 1303.

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