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An Experimental and Computational Study on the Orthotropic Failure of Separators for Lithium-Ion Batteries

Author

Listed:
  • Marian Bulla

    (Altair Engineering GmbH, Eupener Str. 129 BT D, 50933 Cologne, Germany)

  • Stefan Kolling

    (Institute of Mechanics and Materials, Technische Hochschule Mittelhessen, Wiesenstr. 14, 35390 Giessen, Germany)

  • Elham Sahraei

    (Electric Vehicle Safety Lab (EVSL), Temple University, 1947 N 12th St, Philadelphia, PA 19122, USA
    Massachusetts Institute of Technology, Cambridge, MA 02139, USA)

Abstract

In the present study, the mechanical properties of a dry-processed polyethylene (PE) separator are investigated in terms of deformation and failure limits. The focus is set on the anisotropic mechanical behavior of this material. A deeper understanding of the damage mechanism is important for further safety and crashworthiness investigations and predictions of damage before failure. It has been found that separator integrity is one of the crucial parts in preventing internal short circuit and thermal runaway in lithium-ion (Li-ion) batteries. Based on uniaxial tensile tests with local strain measurement, a novel failure criterion for finite element analysis (FEA), using the explicit FEA solver Altair Radioss, has been developed to predict the effect of high mechanical loads with respect to triaxiality, large plastic strain and orthotropy. Finally, a simulation model of a PE separator was developed combining the novel failure criterion with Hill’s yield surface and a Swift–Voce hardening rule. The model succeeded in predicting the anisotropic response of the PE separator due to deformation and failure. The proposed failure model can also be combined with other constitutive material laws.

Suggested Citation

  • Marian Bulla & Stefan Kolling & Elham Sahraei, 2020. "An Experimental and Computational Study on the Orthotropic Failure of Separators for Lithium-Ion Batteries," Energies, MDPI, vol. 13(17), pages 1-17, August.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:17:p:4399-:d:404247
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    Citations

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    Cited by:

    1. Lingxiao Zhu & Yong Xia & Yuanjie Liu & Yulong Ge & Lin Wang & Lei Zhang, 2021. "Extending a Homogenized Model for Characterizing Multidirectional Jellyroll Failure in Prismatic Lithium-Ion Batteries," Energies, MDPI, vol. 14(12), pages 1-15, June.
    2. Marian Bulla & Stefan Kolling & Elham Sahraei, 2021. "A Material Model for the Orthotropic and Viscous Behavior of Separators in Lithium-Ion Batteries under High Mechanical Loads," Energies, MDPI, vol. 14(15), pages 1-17, July.
    3. Marian Bulla & Christopher Schmandt & Stefan Kolling & Thomas Kisters & Elham Sahraei, 2022. "An Experimental and Numerical Study on Charged 21700 Lithium-Ion Battery Cells under Dynamic and High Mechanical Loads," Energies, MDPI, vol. 16(1), pages 1-15, December.

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