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【Applied Energy最新原创论文】锂离子电池的电化学-力学耦合多尺度建模方法和全场应力分布

AEii国际应用能源  · 公众号  ·  · 2023-07-07 18:30

正文

原文信息:

An electrochemical-mechanical coupled multi-scale modeling method and full-field stress distribution of lithium-ion battery

原文链接:

https://www.sciencedirect.com/science/article/pii/S0306261923008085?dgcid=coauthor

Highlights

(1) 提出了一种电化学-力学耦合的多尺度精细化建模方法。

(2) 首次得到了电池单体在工作过程中的全场应力和应变分布。

(3) 电池工作时内部不同组件中的应力具有明显的不均匀性。

(4) 通过数据映射技术大幅度减少了计算量。

摘要

锂离子电池的飞速发展使市场对电池使用寿命的关注愈发强烈。大量研究表明,由循环充放电过程导致的交变扩散诱导应力会显著缩短电池的使用寿命。近年来,科学家们试图通过实验和模拟揭示锂离子电池在充放电过程中内部应力的分布和演变,从而为其设计和使用提出指导意见。然而,现有的数值模拟框架仍局限于颗粒、电极和电池单元,而不是完整的电池单体。因此,迫切需要开发一种能够获得商用锂离子电池工作时的全场应力分布的方法,以揭示应力对其寿命的影响,进一步提高设计和优化效率。本文提出了一种锂离子电池的电化学-力学耦合多尺度精细化建模方法,解决了从电极极片到电池单体的跨尺度建模和仿真的技术难题。以软包锂离子电池为例,得到并分析了电池单体在充电过程中的全场位移分布、全场应变分布和全场应力分布,为锂离子电池力学性能的研究提供了新的技术手段和启示。


更多关于" lithium-ion battery "的研究请见:

https://www.sciencedirect.com/search?pub=Applied%20Energy&cid=271429&qs=lithium-ion%20battery

Abstr act

The rapid development of lithium-ion batteries has made the market more and more concerned about their lives. A large number of studies have shown that the alternating diffusion-induced stress caused by the cyclic charging and discharging processes can significantly shorten the service life of a battery. In recent years, scientists have tried to reveal the distributions and evolutions of the internal stress in lithium-ion batteries during operation by means of experiments and simulations, so as to propose guidance for their design and application. However, the existing numerical simulation framework is still limited to the particles, electrodes and battery units, rather than a battery cell. It is urgent to develop a method that can obtain the full-field stress distributions in commercial lithium-ion battery cells during working, so as to reveal the influence of stress on their lives, and further improve the efficiency of design and optimization. In this paper, an electrochemical-mechanical coupled multi-scale modeling method for lithium-ion batteries is proposed, which solves the technical problem of cross-scaled modeling and simulation from battery units to battery cells. Taking a pouch lithium-ion cell as an example, the lithium concentration distribution, potential distribution, and current density distribution of the battery unit, as well as the full-field displacement distribution, strain distribution and stress distribution of the battery cell during charging are obtained and analyzed. And the assumption, adaptability and potential applications of the method are discussed. It provides a new technical means and insight into the properties of lithium-ion batteries, and even solid-state batteries in the future.

Keywords:

Lithium-ion battery

Stress distribution

Multi-scale

Electrochemical-Mechanical coupling

Electric vehicle

Graphics


Fig. 1. Structures of the battery cell and battery unit

Fig. 2. Electrochemical-Mechanical coupled multi-scale modeling method for lithium-ion batteries








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