原文信息:
Size effect on the thermal and mechanical performance of cylindrical lithium-ion batteries
原文链接:
https://www.sciencedirect.com/science/article/pii/S0306261924014399
Highlights
•建立了多物理场耦合的圆柱型电池数字孪生模型。
•通过径高比(D/H)值衡量圆柱电池的热性能。
•径高比更大的电池表现出更低的平均温度与温度梯度。
•更大直径的圆柱电池卷心易发生内层屈曲和外层拉裂。
•电池直径需在热性能与力学表现之间进行权衡
Abstract
Increasing the size of cylindrical lithium-ion batteries (LIBs) to achieve higher energy densities and faster charging represents one effective tactics in nowadays battery society. A systematic understanding on the size effect of energy density, thermal and mechanical performance of cylindrical LIBs is of compelling need. Taking the diameter D and height H of cylindrical LIBs as variables, we shed light on the energy densities, thermal and mechanical performance of cylindrical LIBs. The volumetric energy density increases with D, while the gravimetric energy density first increases with D, peaks at a certain diameter before dropping with further increasing D. The thermal performance of cylindrical LIBs could be better characterized by the diameter-to-height ratio: cells of identical capacity but with greater D/H show lower temperature rise and lower thermal gradient at high cycling rates. Mechanically, LIBs of greater D are prone to buckling on the jellyroll close to core, and may fracture under tension on outer jellyroll near the cell case. Those findings suggest the necessity to optimize D and H of cylindrical LIBs insomuch as the trade-offs between the thermal and mechanical performance.
Keywords
Cylindrical lithium-ion battery;
Thermal-mechanical performance;
Energy density;
Size effect;
Optimal design;
Graphics
Graphical abstract
Fig. 1.Multi-field coupled digital twin model of a large-size all-tab cylindrical battery.
Fig. 2. The calculated energy density profiles of (a) capacity, (b) volumetric energy density, and (c) gravimetric energy density for different sized NMC-based LIBs.
Fig. 6. The simulated temperature evolution in 4640 and 26110 cells.
Fig. 9. The simulated mechanical results in 4640 and 26110 cells.
团队简介
本研究由中国科学院力学研究所、中国科学技术大学、以及埃因霍芬理工大学的研究人员共同完成。
通讯作者简介:
魏宇杰,中国科学院力学研究所研究员,博士生导师,非线性力学国家重点实验室主任。国家“万人计划”科技创新领军人才,科技部“中青年科技创新领军人才”、国家杰出青年基金获得者,中科院百人计划入选者。主要研究方向为:固体强度与破坏理论、晶体材料变形机理及本构模型、电池材料力热化耦合问题、工程结构服役可靠性等。
陈春光,中国科学院力学研究所副研究员,主要研究方向为锂离子电池多物理场模拟、寿命可靠性分析、材料制备与表征等相关问题。
第一作者简介:
刘锦,中国科学院力学研究所博士研究生,主要研究方向为锂离子电池多物理场耦合模拟、寿命可靠性分析与预测等。
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