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An isolated active balancing and monitoring system for lithium ion battery stacks utilizing a single transformer per cell

Date
2021
Abstract
An active battery management system for lithium ion battery stacks is described, that is robust and scalable. The architecture is based on an isolation unit consisting of a small equal turns ratio high isolation transformer with two diodes. One isolation unit is connected to each series connected cell in the battery stack and enables both accurate cell voltage monitoring and active cell balancing. The output of the isolation unit is completely galvanically isolated and thus suitable for high voltage packs with stringent safety requirements such as automotive and industrial electrical vehicles. Detailed measurements results are presented and a complete prototype for a LiFePO4 16s2p 2-kWh battery module is constructed and its performance measured.
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Description
peer-reviewed
Publisher
IEEE Computer Society
Citation
IEEE Transactions on Power Electronics;36 (4), pp. 3727-3734
Collections
Electronic & Computer Engineering
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Conway_2021_Isolated.pdf
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Keywords
Battery management system (BMS), cell balancing, cell isolation, flyback transformer, lithium ion battery stacks
ULRR Identifiers
https://hdl.handle.net/10344/9621
 https://doi.org/10.34961/3885
Funding code
Funding Information
Sustainable Development Goals
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Type
Article
Rights
https://creativecommons.org/licenses/by-nc-sa/1.0/
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