Increased performance of battery packs by active equalization

Jonathan W. Kimball, Brian T. Kuhn, Philip T. Krein

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Battery packs for most applications are series strings of electrochemical cells. Due to manufacturing variations, temperature differences, and aging, the individual cells perform differently. When a complete pack is charged and discharged as a single two-terminal circuit element, some cells are chronically overcharged, undercharged, or overdischarged, all of which act to reduce cell life. The performance and life of the complete pack is limited by the weakest cell. Many methods have been proposed and explored to mitigate this problem. In the present work, a switched-capacitor converter is shown to be a simple and effective method to maintain equal cell or monoblock charge conditions. Design criteria are discussed.

Original languageEnglish (US)
Title of host publicationVPPC 2007 - Proceedings of the 2007 IEEE Vehicle Power and Propulsion Conference
Pages323-327
Number of pages5
DOIs
StatePublished - Dec 1 2007
EventVPPC 2007 - 2007 IEEE Vehicle Power and Propulsion Conference - Arlington, TX, United States
Duration: Sep 9 2007Sep 12 2007

Publication series

NameVPPC 2007 - Proceedings of the 2007 IEEE Vehicle Power and Propulsion Conference

Other

OtherVPPC 2007 - 2007 IEEE Vehicle Power and Propulsion Conference
CountryUnited States
CityArlington, TX
Period9/9/079/12/07

Keywords

  • Battery equalization
  • Battery pack
  • Electric vehicle

ASJC Scopus subject areas

  • Automotive Engineering
  • Control and Systems Engineering

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