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Data for 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 (2016) Data for A study of cell-to-cell interactions and degradation in parallel strings : implications for the battery management system. [Dataset]
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Official URL: http://wrap.warwick.ac.uk/81110
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: | Dataset | ||||||||||||
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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) | ||||||||||||
Type of Data: | Electrical test data for battery cells | ||||||||||||
Library of Congress Subject Headings (LCSH): | Lithium ion batteries, Automobiles -- Batteries -- Research | ||||||||||||
Publisher: | University of Warwick, WMG | ||||||||||||
Official Date: | 30 August 2016 | ||||||||||||
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Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Media of Output (format): | .mat .xlsx | ||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
Copyright Holders: | Please contact Carlos Pastor-Fernández (c.pastor-fernandez@warwick.ac.uk), Jason Page (jpage3@jaguarlandrover.com) or Jonathan Smith (J.R.Smith.1@warwick.ac.uk) | ||||||||||||
Description: | Characterisation test on four cells Under 01_Capacity_and_Pseudo_OCV folder: 1C capacity test and pseudo-OCV test Under 02_EIS folder: EIS data for SoC 20%, 50% and 90% Each mat file contains all the snapshots (columns 1-11, snapshot 1 to 11) and cells (rows 1-4, Cell 1 to 4) |
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Date of first compliant deposit: | 30 August 2016 | ||||||||||||
RIOXX Funder/Project Grant: |
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