一种减轻锂离子热滥用模型数值刚度的新方法

IF 5.4 Q2 CHEMISTRY, PHYSICAL
Jason Ostanek , Mohammad Parhizi , Judith Jeevarajan
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引用次数: 0

摘要

锂离子电池热失控的数值模拟已成为设计更安全电池系统的重要工具。在发展分解反应的动力学机制和包括额外的物理,如排气和燃烧方面取得了重大进展。然而,在热失控过程中,控制热传导方程和分解反应方程在数值上变得僵硬,这限制了热滥用模型在低维公式中的应用。本工作引入了一种新的解决策略,该策略仅在模拟的僵硬部分(即仅在热失控期间)从完整的3D瞬态热传导公式转换为绝热的0D集总体公式。为了测试新的求解器,配置了一个3D热滥用模型来模拟18650格式电池的烤箱测试。对不同刚度情况下的新求解器进行了仿真,并与采用典型积分方法的基准求解器进行了比较。对于极刚性场景,计算速度相对于基准求解器提高了183倍,且对求解精度影响很小,有效缓解了数值刚度问题。新的解决方案策略解决了高维模型(如基于3d - cfd的热滥用模型)的可扩展性差的问题,并提高了它们在工业应用中的实用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A novel method for alleviating numerical stiffness in Li-ion thermal abuse models

Numerical modeling of thermal runaway in Lithium-ion batteries has become a critical tool for designing safer battery systems. Significant progress has been made in developing kinetic mechanisms for decomposition reactions and including additional physics such as venting and combustion. However, the governing heat conduction equation and decomposition reaction equations become numerically stiff during thermal runaway, which limits the utility of thermal abuse models to low-dimensional formulations. The present work introduces a new solution strategy, which switches from the full, 3D transient heat conduction formulation to an adiabatic, 0D lumped body formulation only during the stiff portion of the simulation, i.e., only during thermal runaway. To test the new solver, a 3D thermal abuse model was configured to simulate an oven test of an 18650-format cell. The new solver was exercised for scenarios of varying degrees of stiffness, and the results were compared with a baseline solver using typical integration methods. For an extremely stiff scenario, computation speed was increased by a factor of 183x relative to the baseline solver, with little impact on solution accuracy, thus effectively alleviating the numerical stiffness issue. The new solution strategy addresses the poor scalability of high-dimensional models, such as 3D-CFD-based thermal abuse models, and improves their practicality for industrial use.

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来源期刊
CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
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