A hierarchical electrochemical-thermal-mechanical coupled model capable of predicting non-uniform behaviors in large-format Li-ion cells

Kai Yang, Wen Ke Zhang, Ying Yin, Jinrui Nan*, Wenwei Wang, Jiuchun Jiang, Xiao Guang Yang*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

摘要

This work presents a hierarchical electrochemical-thermal-mechanical coupled model of Li-ion cells that integrates multiple submodels across particle, electrode, and cell levels. The model divides a single cell into various parallel-connected unit cells, each associated with a physics-based pseudo-2D (P2D) model capable of predicting mass and charge transfers at the electrode level and diffusion-induced stress/strain at the particle level. At the cell level, a heat-transfer submodel calculates the temperature distribution across the cell thickness, along with an electrical submodel to predict current partition and a phenomenological mechanical submodel to estimate force and displacement under preloading conditions. These through-plane submodels are bi-directionally coupled with the P2D models, enabling the translation of particle-level stress/strain changes to cell-level force and displacement evolutions under various preloading conditions. The model is validated against experimental data from three types of cells with different thicknesses, demonstrating its capability in predicting current/voltage, temperature, and displacement/force evolutions at various C-rates and preloading forces. The calibrated model is then extrapolated to explore the coupled electrochemical, thermal, and mechanical behaviors in large-format cells with considerably greater thickness. Significant non-uniformities are observed at two levels: across the electrode thickness and across the cell thickness. The former is associated with non-uniform current densities within a single electrode, leading to varying rates of lithiation/delithiation at different positions and, consequently, varying rates of particle volume changes. The latter is associated with non-uniform current and temperature distributions, resulting in non-uniform reaction-induced and thermal-induced displacement and force.

源语言英语
文章编号236049
期刊Journal of Power Sources
629
DOI
出版状态已出版 - 15 2月 2025

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引用此

Yang, K., Zhang, W. K., Yin, Y., Nan, J., Wang, W., Jiang, J., & Yang, X. G. (2025). A hierarchical electrochemical-thermal-mechanical coupled model capable of predicting non-uniform behaviors in large-format Li-ion cells. Journal of Power Sources, 629, 文章 236049. https://doi.org/10.1016/j.jpowsour.2024.236049