Gas-induced bulging in pouch-cell batteries: a mechanical model

2024/11/20 by Andrea Giudici, Giudici, Andrea, Colin Please +2
Engineering · #Advanced Battery Technologies Research #Electrohydrodynamics and Fluid Dynamics #FOS: Physical sciences #Soft Condensed Matter (cond-mat.soft)

paper · pdf · doi:10.48550/arxiv.2411.13197

openalex publication_date 2024/11/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Over the long timescale of many charge/discharge cycles, gas formation can result in large bulging deformations of a Lithium-ion pouch cell, which is a key failure mechanism in batteries. Guided by recent experimental X-ray tomography data of a bulging cell, we propose a homogenised mechanical model to predict the shape of the deformation and the stress distribution analytically. Our model can be included in battery simulation models to capture the effects of mechanical degradation. Furthermore, with knowledge of the bending stiffness of the cathode electrodes and current collectors, and by fitting our model to experimental data, we can predict the internal pressure and the amount of gas in the battery, thus assisting in monitoring the state of health (SOH) of the cell without breaking the sealed case.

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