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A study of cell-to-cell interactions and degradation in parallel strings : implications for the battery management system
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Pastor-Fernandez, Carlos, Bruen, Thomas, Widanage, Widanalage Dhammika, Gama-Valdez, Miguel-Angel and Marco, James (2016) A study of cell-to-cell interactions and degradation in parallel strings : implications for the battery management system. Journal of Power Sources, 329 . pp. 574-585. doi:10.1016/j.jpowsour.2016.07.121 ISSN 0378-7753.
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Official URL: http://dx.doi.org/10.1016/j.jpowsour.2016.07.121
Abstract
Vehicle battery systems are usually designed with a high number of cells connected in parallel to meet the stringent requirements of power and energy. The self-balancing characteristic of parallel cells allows a battery management system (BMS) to approximate the cells as one equivalent cell with a single state of health (SoH) value, estimated either as capacity fade (SoHE) or resistance increase (SoHP). A single SoH value is however not applicable if the initial SoH of each cell is different, which can occur when cell properties change due to inconsistent manufacturing processes or in-homogeneous operating environments. As such this work quantifies the convergence of SoHE and SoHP due to initial differences in cell SoH and examines the convergence factors. Four 3 Ah 18650 cells connected in parallel at 25 °C are aged by charging and discharging for 500 cycles. For an initial SoHE difference of 40% and SoHP difference of 45%, SoHE converge to 10% and SoHP to 30% by the end of the experiment. From this, a strong linear correlation between ΔSoHE and ΔSoHP is also observed. The results therefore imply that a BMS should consider a calibration strategy to accurately estimate the SoH of parallel cells until convergence is reached.
Item Type: | Journal Article | ||||||||||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TL Motor vehicles. Aeronautics. Astronautics |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||||||
Library of Congress Subject Headings (LCSH): | Lithium ion batteries, Automobiles -- Batteries -- Research | ||||||||||||
Journal or Publication Title: | Journal of Power Sources | ||||||||||||
Publisher: | Elsevier S.A. | ||||||||||||
ISSN: | 0378-7753 | ||||||||||||
Official Date: | 15 October 2016 | ||||||||||||
Dates: |
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Volume: | 329 | ||||||||||||
Number of Pages: | 10 | ||||||||||||
Page Range: | pp. 574-585 | ||||||||||||
DOI: | 10.1016/j.jpowsour.2016.07.121 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||
Date of first compliant deposit: | 15 September 2016 | ||||||||||||
Date of first compliant Open Access: | 15 September 2016 | ||||||||||||
RIOXX Funder/Project Grant: |
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