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Title: Strain distribution and failure mode of polymer separators for Li-ion batteries under biaxial loading

Abstract

Deformation of polymer separators for Li-ion batteries has been studied under biaxial tension by using a dome test setup. This deformation mode provides characterization of separator strength under more complex loading conditions, closer representing deformation of an electric vehicle battery during crash event, compared to uniaxial tension or compression. Two polymer separators, Celgard 2325 and Celgard 2075 were investigated by deformation with spheres of three different diameters. Strains in separators were measured in situ by using Digital Image Correlation (DIC) technique. The results show consistent rupture of separators along the machine direction coinciding with areas of high strain accumulation. The critical first principal strain for failure was independent of the sphere diameter and was determined to be approximately 34% and 43% for Celgard 2325 and Celgard 2075 respectively. These values can be taken as a criterion for internal short circuit in a battery following an out-of-plane impact. A Finite Element (FE) model was built with the anisotropic description of separator behavior, derived from tensile tests in orthogonal directions. In conclusion, the results of simulations predicted the response of separator rather well when compared to experimental results for various sizes of rigid sphere.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [1];  [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computational Sciences and Engineering Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Transportation Science Division
  4. National Highway Safety and Transportation Administration, Washington, DC (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1414699
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 378; Journal Issue: C; Journal ID: ISSN 0378-7753
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; Li-ion battery; Mechanical abuse; Separator; Safety

Citation Formats

Kalnaus, Sergiy, Kumar, Abhishek, Wang, Yanli, Li, Jianlin, Simunovic, Srdjan, Turner, John A., and Gorney, Phillip. Strain distribution and failure mode of polymer separators for Li-ion batteries under biaxial loading. United States: N. p., 2017. Web. doi:10.1016/j.jpowsour.2017.12.029.
Kalnaus, Sergiy, Kumar, Abhishek, Wang, Yanli, Li, Jianlin, Simunovic, Srdjan, Turner, John A., & Gorney, Phillip. Strain distribution and failure mode of polymer separators for Li-ion batteries under biaxial loading. United States. doi:10.1016/j.jpowsour.2017.12.029.
Kalnaus, Sergiy, Kumar, Abhishek, Wang, Yanli, Li, Jianlin, Simunovic, Srdjan, Turner, John A., and Gorney, Phillip. Sat . "Strain distribution and failure mode of polymer separators for Li-ion batteries under biaxial loading". United States. doi:10.1016/j.jpowsour.2017.12.029.
@article{osti_1414699,
title = {Strain distribution and failure mode of polymer separators for Li-ion batteries under biaxial loading},
author = {Kalnaus, Sergiy and Kumar, Abhishek and Wang, Yanli and Li, Jianlin and Simunovic, Srdjan and Turner, John A. and Gorney, Phillip},
abstractNote = {Deformation of polymer separators for Li-ion batteries has been studied under biaxial tension by using a dome test setup. This deformation mode provides characterization of separator strength under more complex loading conditions, closer representing deformation of an electric vehicle battery during crash event, compared to uniaxial tension or compression. Two polymer separators, Celgard 2325 and Celgard 2075 were investigated by deformation with spheres of three different diameters. Strains in separators were measured in situ by using Digital Image Correlation (DIC) technique. The results show consistent rupture of separators along the machine direction coinciding with areas of high strain accumulation. The critical first principal strain for failure was independent of the sphere diameter and was determined to be approximately 34% and 43% for Celgard 2325 and Celgard 2075 respectively. These values can be taken as a criterion for internal short circuit in a battery following an out-of-plane impact. A Finite Element (FE) model was built with the anisotropic description of separator behavior, derived from tensile tests in orthogonal directions. In conclusion, the results of simulations predicted the response of separator rather well when compared to experimental results for various sizes of rigid sphere.},
doi = {10.1016/j.jpowsour.2017.12.029},
journal = {Journal of Power Sources},
number = C,
volume = 378,
place = {United States},
year = {Sat Dec 16 00:00:00 EST 2017},
month = {Sat Dec 16 00:00:00 EST 2017}
}

Journal Article:
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