Internal short circuit and failure mechanisms of lithium-ion pouch cells under mechanical indentation abuse conditions：An experimental study

By Xiao-qing Zhu, Hsin Wang, Xue Wang, Yanfei Gao, S. Allu, E. Cakmak, Zhenpo Wang. 2020

158 citations recorded by the source corpus.

Abstract Electromechanical structural integrity and thermal stability dictate the safety performance of lithium-ion batteries. Progressive deformation and failure across microscopic and macroscopic lengths scales that are responsible for internal short circuit (ISC) in lithium-ion cells under mechanical abuse conditions remains elusive. In this study, a series of indentation tests were conducted on lithium-ion cells with different capacities up to the occurrence of ISC. The external response and internal configuration of these cells were investigated. It is discovered that cells with different capacities and state of charges exhibited different behaviors. Maximum temperature, which is often regarded as the most important parameter related to thermal runaway (TR), varied considerably due to the complicated contact configurations. X-ray computed tomography (XCT) showed that ISC was a collective result of shear band or other strain-localization modes in the electrode assembly, shear offsets in the granular coatings of electrodes, and the accompanying ductile fracture in the metal foils. We believe that the irregular strain-localization modes (kinks, cusps, and buckles), radical mismatches in mechanical properties of different layers, and geometric features of the indenter eventually lead to the tearing/puncture of cell separator at various locations. The results could provide useful guidance for the micromechanical modeling of lithium-ion cells.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/26bb097f3f06853e4971d7bda121c369b263a2e3

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Citations in the corpus

A review of the internal short circuit mechanism in lithium‐ion batteries: Inducement, detection and prevention (2021, methodology): “Then, they divided the deformation process into five stages to better understand the behaviors and failure mechanisms of ISC, and indicated the time of stage I to II could take more than 50% of the deformation under indentation cases.(57) However, the above tests will lead to irreversible deformatio”