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Batteries 2017, 3(4), 39;

A Bilevel Equalizer for Large Lithium Ion Batteries

Electrical Engineering and Computer Science Department, University of Toledo, 2801 W. Bancroft, Toledo, OH 43606-3390, USA
Author to whom correspondence should be addressed.
Received: 5 September 2017 / Revised: 3 November 2017 / Accepted: 21 November 2017 / Published: 7 December 2017
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Due to variations among the cells, large lithium ion batteries (LIB) such as those in battery energy storage stations (BESS) and electric vehicles (EVs) must have an equalizer (EQU) circuit to balance the cell voltages. In spite of their significant losses and other limitations, passive equalizers (PEQ) are used in most applications because they are relatively simple and low cost. Active equalizers (AEQ) reduce these PEQ problems, but are not as widely used due to their much higher cost and complexity. A new hybrid circuit called the Bilevel EQU (BEQ) combines the PEQ and AEQ to provide much higher performance than a pure PEQ but at a much lower cost than a pure AEQ. View Full-Text
Keywords: lithium ion; equalizer; passive; active; bilevel; discharge capacity; battery management lithium ion; equalizer; passive; active; bilevel; discharge capacity; battery management

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Mubenga, N.S.; Linkous, Z.; Stuart, T. A Bilevel Equalizer for Large Lithium Ion Batteries. Batteries 2017, 3, 39.

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