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

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

doi:10.1109/ECCE.2014.6953991

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

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

Center for Integrated Mobility Sciences

Research output: Contribution to conference › Paper › peer-review

67 Scopus Citations

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 parallel with 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 four series li-ion battery cells and four dual active bridge (DAB) bypass DC-DC converters.

Original language	American English
Pages	4327-4334
Number of pages	8
DOIs	https://doi.org/10.1109/ECCE.2014.6953991 https://doi.org/10.1109/ECCE.2014.6953991
State	Published - 11 Nov 2014
Event	IEEE Energy Conversion Congress and Exposition (ECCE) - Pittsburgh, Pennsylvania Duration: 14 Sep 2014 → 18 Sep 2014

Conference

Conference	IEEE Energy Conversion Congress and Exposition (ECCE)
City	Pittsburgh, Pennsylvania
Period	14/09/14 → 18/09/14

Bibliographical note

See NREL/CP-5400-61263 for preprint

NREL Publication Number

NREL/CP-5400-64931

Keywords

bridge circuits
DC-DC power converters
distributed control
energy storage
secondary cells
state estimation

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Smith, K., Wood, E., Zane, R., Plett, G., Maksimovic, D., ur Rehman, M. M., Evzelman, M., & Hathaway, K. (2014). Modular Approach for Continuous Cell-Level Balancing to Improve Performance of Large Battery Packs. 4327-4334. Paper presented at IEEE Energy Conversion Congress and Exposition (ECCE), Pittsburgh, Pennsylvania. https://doi.org/10.1109/ECCE.2014.6953991, https://doi.org/10.1109/ECCE.2014.6953991

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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 parallel with 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 four series li-ion battery cells and four dual active bridge (DAB) bypass DC-DC converters.",

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author = "Kandler Smith and Eric Wood and Regan Zane and Gregory Plett and Dragan Maksimovic and {ur Rehman}, {M. Muneeb} and Michael Evzelman and Kelly Hathaway",

note = "See NREL/CP-5400-61263 for preprint; IEEE Energy Conversion Congress and Exposition (ECCE) ; Conference date: 14-09-2014 Through 18-09-2014",

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doi = "10.1109/ECCE.2014.6953991",

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Smith, K , Wood, E, Zane, R, Plett, G, Maksimovic, D, ur Rehman, MM, Evzelman, M & Hathaway, K 2014, 'Modular Approach for Continuous Cell-Level Balancing to Improve Performance of Large Battery Packs', Paper presented at IEEE Energy Conversion Congress and Exposition (ECCE), Pittsburgh, Pennsylvania, 14/09/14 - 18/09/14 pp. 4327-4334. https://doi.org/10.1109/ECCE.2014.6953991, https://doi.org/10.1109/ECCE.2014.6953991

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AU - Wood, Eric

AU - Zane, Regan

AU - Plett, Gregory

AU - Maksimovic, Dragan

AU - ur Rehman, M. Muneeb

AU - Evzelman, Michael

AU - Hathaway, Kelly

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AB - 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 parallel with 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 four series li-ion battery cells and four dual active bridge (DAB) bypass DC-DC converters.

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KW - DC-DC power converters

KW - distributed control

KW - energy storage

KW - secondary cells

KW - state estimation

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T2 - IEEE Energy Conversion Congress and Exposition (ECCE)

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ER -

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

Abstract

Conference

Bibliographical note

NREL Publication Number

Keywords

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