储能科学与技术 ›› 2025, Vol. 14 ›› Issue (6): 2339-2351.doi: 10.19799/j.cnki.2095-4239.2025.0093

• 储能系统与工程 • 上一篇    下一篇

锂离子电池极片狭缝式宽幅涂布模头的设计优化

郎满权1,2,3(), 杨军3, 张中春3, 彭建林3, 杨续来1,2()   

  1. 1.合肥大学安徽省锂离子动力与储能电池产业共性技术研究中心，安徽 合肥 230601
    2.安徽省动力与储能电池产业创新研究院，安徽 合肥 230031
    3.深圳市曼恩斯特科技股份有限公司，广东 深圳 518118
  • 收稿日期:2025-02-06 修回日期:2025-02-27 出版日期:2025-06-28 发布日期:2025-06-27
  • 通讯作者: 杨续来 E-mail:distance39@outlook.com;yangxl@hfuu.edu.cn
  • 作者简介:郎满权（1999—），男，硕士研究生，研究方向为锂离子电池制造工艺，E-mail：distance39@outlook.com；
  • 基金资助:
    安徽省重点研发计划项目(2023z04020004);合肥市自然科学基金项目(2023042)

Optimization of long slot-die head for Li-ion battery electrode coating

Manquan LANG1,2,3(), Jun YANG3, Zhongchun ZHANG3, Jianlin PENG3, Xulai YANG1,2()   

  1. 1.LIB Technology Center of Anhui Province, Hefei University, Hefei 230601, Anhui, China
    2.Anhui Province Innovation Research Institute of Power and Energy Storage Battery Industry, Hefei 230031, Anhui, China
    3.Shenzhen MANST Technology Co. , Ltd, Shenzhen 518118, Guangdong, China
  • Received:2025-02-06 Revised:2025-02-27 Online:2025-06-28 Published:2025-06-27
  • Contact: Xulai YANG E-mail:distance39@outlook.com;yangxl@hfuu.edu.cn

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摘要：

狭缝式宽幅涂布能够提高极片的生产效率，减少涂布过程中的材料浪费，提高材料的利用率，进一步降低生产成本。宽幅涂布对涂布模头要求较高，模头结构直接影响电极片的特性。本研究选择腔体长度为1520 mm，涂宽可达1240 mm的宽幅涂布模头为研究对象，以150 μm湿膜的厚度一致性作为涂布质量评价指标，从腔体设计、进料口位置调整和垫片倒角设计等3个方面进行了模头结构的设计优化，并通过追踪外流场启动过程来验证优化方案的可行性。研究结果表明，单腔体单进料口(进料口位于模头中间)模头涂布过程中，随涂布宽度增大，湿膜呈现中心区域厚而边缘区域薄的趋势，厚度一致性差；而添加副腔后，涂布宽度在1240 mm情况下，浆料1湿膜厚度一致性从无副腔模头涂布的26.88%提升到9.79%；进一步将单进料口设计调整成双进料口设计，浆料1湿膜厚度一致性达到0.33%；此外，垫片倒角调整可影响浆料出口边缘流体域的壁面剪切力改善涂层边缘质量。在涂布速度60 m/min、涂布总宽度1240 mm条件下，浆料1湿膜厚度一致性优化至0.28%。数值模拟与实验结果对比显示，平均相对误差仅为1.35%，表明了涂布模头结构设计仿真模型的准确性。通过对其他3种代表性浆料的涂布数值仿真，湿膜厚度一致性均能控制在0.38%～0.58%范围内，表明该优化设计方案具有较强的普适性，研究结果为宽幅模头的优化设计提供了参考。

关键词: 宽幅涂布, 数值模拟, 流道设计, 内流场, 外流场

Abstract:

Slot-die coating improves the production efficiency of electrode sheets, reduces material waste during coating, enhances material utilization, and lowers production costs. Wide-width coating requires efficient die heads, and the structure of the slot-die head directly affects the properties of the electrode sheets. In this study, we designed a slot-die head with a cavity length of 1520 mm and a total coating width of 1240 mm. The coating quality was evaluated using the thickness consistency of the 150 μm wet-coated layer as an indicator. The slot-die head structure was optimized in three aspects: cavity optimization, adjustment of the feed port position, and shim chamfering design. The feasibility of the optimization design was verified by tracking the start-up process of the external flow field. During the coating process with a single cavity and single-feed port (the inlet was located in the middle of the die head), the wet-coated layer was thicker in the center area and thinner in the edge area. With increasing coating width, the thickness consistency decreased significantly. However, after adding a subcavity with a coating width of 1240 mm, the wet-layer thickness consistency of slurry 1 improved from 26.88% to 9.79%. By further adjusting the single-feed inlet design to a dual-feed inlet design, the consistency of the wet-layer thickness of slurry 1 increased to 0.33%. In addition, the wall shear stress in the fluid domain at the edge of the outlet was optimized by adjusting the shim chamfering, which improved the quality of the coating edge. With a coating speed of 60 m/min and a coating width of 1240 mm, the consistency of the wet-layer thickness of slurry 1 was improved to 0.28%. The comparison of numerical simulation and experimental results showed an average relative error of only 1.35%, indicating that the slot-die structural model exhibits high accuracy. Numerical simulations of the other three viscosity slurries revealed wet-film thickness consistency in the range of 0.38%—0.58%, indicating the strong applicability of the designed model. These results serve as a reference for optimizing the design of long slot-die heads.

Key words: slot-die coating, numerical simulation, flow channel design, internal flow field, external flow field

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