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Please use this identifier to cite or link to this item: http://arks.princeton.edu/ark:/88435/dsp01cf95jf58f
Title: Understanding Stress Distribution in Cylindrical Lithium-ion Batteries through Finite Element Modeling
Authors: Madge, Shalaka
Advisors: Arnold, Craig
Department: Mechanical and Aerospace Engineering
Certificate Program: Engineering and Management Systems Program
Materials Science and Engineering Program
Class Year: 2021
Abstract: Lithium-ion batteries (LIBs) are used in industries ranging from aerospace to electric vehicles to electronics. As these industries grow, LIBs will be increasingly popular. LIBs are often used for their high energy density and stability, but they are also prone to short circuits and fires. Battery failure in a satellite, car, or power grid system cannot be afforded. It puts not only missions, but also lives, at risk. Making LIBs safer and longer-lasting will be crucial as they become more prevalent in our lives. Pouch cells and cylindrical cells are two types of LIBs. While current research focuses on pouch cells or the electrochemical aspect of cylindrical LIB operation, little research has been done on understanding stress in cylindrical LIBs from a purely mechanical standpoint. Such an understanding can provide some needed insight into increasing battery safety and lifetime. This work will focus on understanding the stress distribution in the jelly roll (internal winding) of a cylindrical LIB and probing parameters of the current collectors to see their effects on the jelly roll. The first step of this research involved creating and testing a validation model of a pouch cell. The second step involved creating and testing a cylindrical battery model. The results of this work show how stresses and strain vary linearly with respect to varying loads or internal electrode expansion. The results also show that adjusting the Young's moduli of the current collectors in comparison to the Poisson's ratio has a more significant effect on stress distribution. Lower Young's moduli reduce stress in the battery and increase uniformity across the jelly roll, which can decrease degradation and the chance for short circuiting in a battery, thereby increasing battery lifetime and safety. Additional research incorporating non-linearity into the model, understanding edge effects in the jelly roll, and studying the commercial viability of changes in the current collectors are some areas of future work.
URI: http://arks.princeton.edu/ark:/88435/dsp01cf95jf58f
Type of Material: Princeton University Senior Theses
Language: en
Appears in Collections:Mechanical and Aerospace Engineering, 1924-2021

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