Abstract
Based on the experimental observation, pouch cells can withstand severe deformation during fully confined in-plane compression with flat punches without any risks of a short circuit. During the deformation, the structuralbehavior is characterized by regular kinks, buckles, and shear bands. This study aims to provide a modeling approach for the in-plane compression on lithium-ion pouch batteries in a fully confined case with a flat punch. To capture the right mechanism of buckling while maintaining a satisfactory computational efficiency, two approaches are proposed: a homogenized model with imperfections and an enhanced homogenized model with equivalent layers of metal foils. The first approach introduces periodic geometrical imperfections with a wavelength as observed in the experiments. The second one creates a model in between the homogenized model and detailed model with equivalent properties of coating materials and metal foils. It is concluded that the introduction of imperfections could not correctly capture the folding mechanism, while with the latter hybrid approach, it is possible to capture the right progressive folding pattern of the battery cells during the in-plane compression test. Different potential approaches of the simulation model are investigated for obtaining a better agreement of the prediction and the measured experimental load-displacement response.
Highlights
This material is protected by copyright and other intellectual property rights, and duplication or sale of all or part of any of the repository collections is not permitted, except that material may be duplicated by you for your research use or educational purposes in electronic or print form
It is interesting to conclude that the enhanced homogenized models with different metal foils converge when the metals layers are above five, which is validated by the results of a model with 15 metal layers
The completely homogenized model overpredicts the force level overestimation of the force but with the right deformation pattern implies that the assumption of deformation isotropy might not be valid for the pouch cells
Summary
This material is protected by copyright and other intellectual property rights, and duplication or sale of all or part of any of the repository collections is not permitted, except that material may be duplicated by you for your research use or educational purposes in electronic or print form. To guarantee the mechanical safety of the battery cells, especially in various accidents for electric vehicles, different types of mechanical abuse tests have been designed and conducted. Most of these tests cause out-of-plane deformation of the pouch cells, such as the hemispherical and cylindrical indentation tests, uniaxial unconstrained and partially/fully confined compression tests, and threepoint bending tests.[2,3,4,5,6,7,8,9] One of the probably most known tests is the nail penetration test. Among the vast mechanical abuse tests performed in the literature, only less than ten studies focusing on the in-plane compression[8,11,12,13,14,15,16,17,18] but with
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
