Journal
JOURNAL OF POWER SOURCES
Volume 298, Issue -, Pages 309-321Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.08.049
Keywords
Lithium-ion battery; Short circuit; Multi-physics simulation; Mechanical crush; Temperature ramp; Indentation
Funding
- Vehicle Technologies Office, Office of Energy Efficiency and Renewable Energy, U.S. Department of Energy [WBS1.1.2.406]
- Department of Energy's Office of Energy Efficiency and Renewable Energy
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The safety behavior of lithium-ion batteries under external mechanical crush is a critical concern, especially during large-scale deployment. We previously presented a sequentially coupled mechanical-electrical-thermal modeling approach for studying mechanical-abuse-induced short circuit. In this work, we study different mechanical test conditions and examine the interaction between mechanical failure and electrical-thermal responses, by developing a simultaneously coupled mechanical-electrical-thermal model. The present work utilizes a single representative-sandwich (RS) to model the full pouch cell with explicit representations for each individual component such as the active material, current collector, separator, etc. Anisotropic constitutive material models are presented to describe the mechanical properties of active materials and separator. The model predicts accurately the force-strain response and fracture of battery structure, simulates the local failure of separator layer, and captures the onset of short circuit for lithium-ion battery cells under sphere indentation tests with three different diameters. Electrical-thermal responses to the three different indentation tests are elaborated and discussed. Numerical studies are presented to show the potential impact of test conditions on the electrical-thermal behavior of the cell after the occurrence of short circuit. (C) 2015 Elsevier B.V. All rights reserved.
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