"Multiscale finite element analysis of cylindrical jellyroll based ener" by Wesley James Knee

Date of Award

2025

Document Type

Thesis

Degree Name

Master of Science in Engineering (MSE)

Department

Mechanical Engineering

Committee Chair

Nicholas Ginga

Committee Member

George Nelson

Committee Member

Nathan Spulak

Research Advisor

Nicholas Ginga

Subject(s)

Lithium cells--Reliability, Multiscale modeling, Lithium ion batteries, Electic batteries, Energy storage

Abstract

Lithium batteries are an ever-expanding solution for energy storage; however, their internal chemistry is highly prone to combustion. Any severe mechanical failure can lead to this scenario, which is problematic as their use in electric vehicles increases. As such, finite element modeling efforts need to improve in order to properly define the failure mechanics of these batteries. Efforts have already been made to create an accurate model of the battery as a whole, but this generalized model does not capture the short-circuiting phenomena within the internal components. To solve this problem, a representative volume model that generates input data and simplifies the internal geometry for a global-local model is proposed. This allows the battery to be accurately modeled mechanically, is computationally inexpensive, and provides an insight into the failure of the exceedingly small internal components to pinpoint exactly when short circuiting occurs.

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