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Article

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

1
Altair Engineering GmbH, Eupener Str. 129 BT D, 50933 Cologne, Germany
2
Institute of Mechanics and Materials, Technische Hochschule Mittelhessen, Wiesenstr. 14, 35390 Giessen, Germany
3
Electric Vehicle Safety Lab (EVSL), Temple University, 1947 N 12th St, Philadelphia, PA 19122, USA
4
Massachusetts Institute of Technology, Cambridge, MA 02139, USA
*
Author to whom correspondence should be addressed.
Energies 2020, 13(17), 4399; https://doi.org/10.3390/en13174399
Received: 27 June 2020 / Revised: 14 August 2020 / Accepted: 25 August 2020 / Published: 26 August 2020
(This article belongs to the Special Issue Crash Safety of Lithium-Ion Batteries)
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. View Full-Text
Keywords: polyethylene separator; elasto-plasticity; orthotropy; failure criterion; finite element model; safety; crashworthiness polyethylene separator; elasto-plasticity; orthotropy; failure criterion; finite element model; safety; crashworthiness
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MDPI and ACS Style

Bulla, M.; Kolling, S.; Sahraei, E. An Experimental and Computational Study on the Orthotropic Failure of Separators for Lithium-Ion Batteries. Energies 2020, 13, 4399. https://doi.org/10.3390/en13174399

AMA Style

Bulla M, Kolling S, Sahraei E. An Experimental and Computational Study on the Orthotropic Failure of Separators for Lithium-Ion Batteries. Energies. 2020; 13(17):4399. https://doi.org/10.3390/en13174399

Chicago/Turabian Style

Bulla, Marian, Stefan Kolling, and Elham Sahraei. 2020. "An Experimental and Computational Study on the Orthotropic Failure of Separators for Lithium-Ion Batteries" Energies 13, no. 17: 4399. https://doi.org/10.3390/en13174399

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