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Battery Entropic Heating Coefficient Testing and Use in Cell-level Loss Modeling for Extreme Fast Charging

FCA US LLC-Pawel Malysz, Oliver Gross
McMaster Automotive Resource Centre-Jeremy Lempert, Phillip Kollmeyer, Ali Emadi
  • Technical Paper
  • 2020-01-0862
To be published on 2020-04-14 by SAE International in United States
To achieve an accurate estimate of losses in a battery it is necessary to consider the reversible entropic losses, which may constitute over 20% of the peak total loss. In this work, a procedure for experimentally determining the entropic heating coefficient of a lithium-ion battery cell is developed. The entropic heating coefficient is the rate of change of the cell’s open-circuit voltage (OCV) with respect to temperature; it is a function of state-of-charge (SOC) and temperature and is often expressed in mV/K. The reversible losses inside the cell are a function of the current, the temperature, and the entropic heating coefficient, which itself is dependent on the cell chemistry. The total cell losses are the sum of the reversible and irreversible losses, where the irreversible losses consist of ohmic losses in the electrodes, ion transport losses, and other irreversible chemical reactions. The entropic heating coefficient is determined by exposing the cell to a range of temperatures at each SOC value of interest. The OCV is recorded at each combination of SOC and temperature, and ∂OCV/∂T…
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Steel, Sheet, Strip, and Plate 0.95Cr - 0.20Mo - (0.30 - 0.35C) (4132)

AMS E Carbon and Low Alloy Steels Committee
  • Aerospace Material Specification
  • AMS6356J
  • Current
Published 2020-03-18 by SAE International in United States
This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.
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Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings 74Ni - 7.0Cr - 16.5Mo Solution Heat Treated

AMS F Corrosion Heat Resistant Alloys Committee
  • Aerospace Material Specification
  • AMS5771G
  • Current
Published 2020-02-25 by SAE International in United States
This specification covers a corrosion and heat-resistant nickel alloy in the form of bars, forgings, flash welded rings, and stock for forging or flash welded rings.
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Steel Sheet, Strip, and Plate 0.80Cr - 1.8Ni - 0.25Mo (0.49 - 0.55C) Annealed

AMS E Carbon and Low Alloy Steels Committee
  • Aerospace Material Specification
  • AMS6396G
  • Current
Published 2020-02-18 by SAE International in United States
This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.
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Aluminum Alloy, Alclad Sheet 4.4Cu - 1.5Mg - 0.60Mn (Alclad 2024-O) Annealed, Fine Grain

AMS D Nonferrous Alloys Committee
  • Aerospace Material Specification
  • AMS4274B
  • Current
Published 2019-12-17 by SAE International in United States
This specification covers an aluminum alloy in the form of sheet 0.009 to 0.126 inch (0.23 to 3.20 mm) inclusive, in nominal thickness, alclad.
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High-Carbon Cast-Steel Shot

Surface Enhancement Committee
  • Ground Vehicle Standard
  • J827_201910
  • Current
Published 2019-10-31 by SAE International in United States
This SAE Recommended Practice describes chemical composition and physical characteristic requirements for high-carbon cast-steel shot to be used for shot peening or blast cleaning operations.
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Aluminum Alloy, Alclad Sheet and Plate 6.3Cu - 0.30Mn - 0.18Zr - 0.10V - 0.06Ti Alclad 2219-T31; Sheet, Solution Heat Treated and Cold Worked Alclad 2219-T351; Plate, Solution Heat Treated and Stress Relieved

AMS D Nonferrous Alloys Committee
  • Aerospace Material Specification
  • AMS4095E
  • Current
Published 2019-10-01 by SAE International in United States
This specification covers an aluminum alloy in the form of sheet and plate 0.020 to 0.499 inch (0.51 to 12.67 mm) inclusive, in nominal thickness (see 8.4) alclad two sides.
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Aluminum Alloy, Sheet and Plate, Alclad 4.4Cu - 1.5Mg - 0.60Mn (2024, -T3 Sheet/-T351 Plate with 1-1/2% Alclad) Solution Heat Treated, Cold Worked and Naturally Aged

AMS D Nonferrous Alloys Committee
  • Aerospace Material Specification
  • AMS4041T
  • Current
Published 2019-09-03 by SAE International in United States
This specification covers an aluminum alloy in the form of sheet and plate alclad two sides, over 0.187 to 1.000 inch (over 4.750 to 25.40 mm) in nominal thickness, supplied in the -T3/-T351 temper.
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Copper Wire, Bare High Purity

AMS D Nonferrous Alloys Committee
  • Aerospace Material Specification
  • AMS4700E
  • Current
Published 2019-08-01 by SAE International in United States
This specification covers one type of copper in the form of wire.
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Steel, Bars, Forgings, and Tubing 1.45Cr (0.93 - 1.05C) (SAE 52100) Premium Aircraft-Quality, Consumable Electrode Vacuum Remelted

AMS E Carbon and Low Alloy Steels Committee
  • Aerospace Material Specification
  • AMS6444N
  • Current
Published 2019-08-01 by SAE International in United States
This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
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