Modular Approach for Continuous Cell-Level Balancing to Improve Performance of Large Battery Packs: Preprint

Kandler Smith, Eric Wood, Regan Zane, Gregory Plett, Dragan Maksimovic, M. Muneeb ur Rehman, Michael Evzelman, Kelly Hathaway

Research output: Contribution to conferencePaper

Abstract

Energy storage systems require battery cell balancing circuits to avoid divergence of cell state of charge (SOC). A modular approach based on distributed continuous cell-level control is presented that extends the balancing function to higher level pack performance objectives such as improving power capability and increasing pack lifetime. This is achieved by adding DC-DC converters in parallelwith cells and using state estimation and control to autonomously bias individual cell SOC and SOC range, forcing healthier cells to be cycled deeper than weaker cells. The result is a pack with improved degradation characteristics and extended lifetime. The modular architecture and control concepts are developed and hardware results are demonstrated for a 91.2-Wh battery pack consisting of fourseries Li-ion battery cells and four dual active bridge (DAB) bypass DC-DC converters.
Original languageAmerican English
Number of pages10
StatePublished - 2014
EventIEEE Energy Conversion Congress and Exposition - Pittsburgh, Pennsylvania
Duration: 14 Sep 201418 Sep 2014

Conference

ConferenceIEEE Energy Conversion Congress and Exposition
CityPittsburgh, Pennsylvania
Period14/09/1418/09/14

NREL Publication Number

  • NREL/CP-5400-61263

Keywords

  • battery
  • battery pack
  • energy storage
  • modular

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