Mechanical Deformation of Lithium-Ion Pouch Cells under In-Plane Loads-Part I: Experimental Investigation

Juner Zhu*, Marco Miguel Koch, Junhe Lian, Wei Li, Tomasz Wierzbicki

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

During an accident of an electric vehicle, the battery pack can be damaged by the intrusion of an external object, causing large mechanical deformation of its lithium-ion battery cells, which may result in an electrical short circuit and subsequently the possible thermal runaway, fire, and even explosion. In reality, the external objects can come in different directions, for example, an out-of-plane indentation that perpendicularly punches the large surface of the pouch cell and an in-plane loading that compresses the thin edge of the cell. In this study, the mechanical deformation of a large-format lithium-ion pouch cell under in-plane loads is investigated via three different types of tests - in-plane compression of fully constrained cells, in-plane compression of cells sandwiched by foams, and in-plane indentation by a round punch. A special apparatus is designed to apply different boundary conditions on the cell, and the deformation history, especially the formation of the buckles of the cells, are monitored by two digital cameras. Post-testing structural analysis is carried out by a cross-sectional cutting and polishing procedure, which gives clear evidence of buckling of all the component layers. (C) 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.

Original languageEnglish
Article number090533
Number of pages9
JournalJournal of the Electrochemical Society
Volume167
Issue number9
DOIs
Publication statusPublished - 7 May 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • REPRESENTATIVE VOLUME ELEMENTS
  • SHORT-CIRCUIT
  • BATTERY CELLS
  • LI-ION
  • COMPUTATIONAL MODELS
  • EXTERNAL-PRESSURE
  • FAILURE
  • SIMULATION
  • FRACTURE
  • SAFETY

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