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In lithium ion arrays, thermal runaway may propagate from a failing cell to neighboring cells and grow into a large-scale fire in a phenomenon referred to as cascading failure. A new experimental setup was developed to investigate cascading failure using 12 cell arrays constructed from cells of 18650 form factor. Thermal runaway was initiated in one cell using an electric heater and observed to propagate through the array using temperature sensors. Cascading failure was studied in nitrogen or air environment to elucidate the impact of combustion. The cell temperature allowed calculation of row-to-row propagation speed in arrays of different cathode chemistries. The yields of oxygen, carbon monoxide, carbon dioxide, total hydrocarbons and hydrogen were measured; corresponding fire hazards were assessed.
This webinar will focus on the following key topics:
• Thermal runaway propagation
• Thermal runaway hazards
• Failure dynamics
• Flammability and toxicity
• Failure Mitigation and suppression
Presenter
Ahmed Said – Postdoc Fellow, Worcester Polytechnic Institute
Ahmed Said is a Postdoctoral Fellow at the Department of Fire Protection Engineering at Worcester Polytechnic Institute (WPI). He is broadly interested in problems related to fire, combustion, and thermal sciences. He is currently engaged in several projects: fire safety of lithium ion batteries, wildland fires, and fire spread on façade systems. He earned his PhD in Mechanical Engineering in 2020 from the University of Maryland, College Park. He also received his BS and MSc in Mechanical Engineering from Cairo University.
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