Internal Short Circuit Analysis of Cylindrical Lithium-Ion Cells Due to Structural Failure

Sheikh, Muhammad, Elmarakbi, Mohab, Rehman, Sheikh and Elmarakbi, Ahmed (2021) Internal Short Circuit Analysis of Cylindrical Lithium-Ion Cells Due to Structural Failure. Journal of the Electrochemical Society, 168 (3). 030526. ISSN 0013-4651

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Official URL: https://doi.org/10.1149/1945-7111/abec54

Abstract

Battery failures are obvious after being subject to abuse conditions however predicting these failures in advance is crucial when using test and validation techniques to understand battery potential. Lithium-ion battery cells are widely used due to their high energy and power densities. When abusive conditions like the three point bend loading are applied to lithium-ion batteries, what occurs to the mechanical behaviours and components is still mostly unknown. To further this understanding, this paper investigates the mechanical behaviour of the separator in the LiCoO2/Graphite cylindrical 18650 cells. Internal short circuit (ISC) behaviour, strain rate dependency and electrochemical status of the cells (i.e. SOC dependency) are studied to understand failure pattern. Furthermore, simple and effective constitutive model for the separator layer is formed, facilitating further mechanical analysis and numerical simulation of lithium-ion battery study. Occurrence of ISC is investigated by jellyroll deformation where casing is removed, and quasi-static load is applied. Numerical simulation model is developed to further investigate sequential structural failures and temperature changes. Simulation results showed good accuracy with experimental results and are useful to predict structural failure of cells. Number of failures including electrolyte leakage, change in shape, sudden voltage drop/temperature rise, and gas venting are observed.

Item Type: Article
Subjects: H600 Electronic and Electrical Engineering
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: John Coen
Date Deposited: 16 Mar 2021 08:49
Last Modified: 31 Mar 2021 15:30
URI: http://nrl.northumbria.ac.uk/id/eprint/45701

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