储能科学与技术

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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 230601
    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:2025-03-28
  • 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, Shenzhen, China
  • Received:2025-02-06 Revised:2025-02-27 Online:2025-03-28
  • 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1520mm，涂宽可达1240mm的宽幅涂布模头为研究对象，以150μm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1240mm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60m/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 technology improves the production efficiency of electrode sheets, reduces material waste during the coating process, enhances material utilization, and further lowers production costs. Wide-width coating places high demands on the coating die head, the structure of slot-die head affects the characteristics of the electrode sheets directly. In this study, the slot-die head with a cavity length of 1520 mm and a total coating width of 1240 mm was selected as the research object, the thickness consistency of 150 μm wet coated layer was taken as the evaluation indicator for coating quality, the design optimization of the slot-die head structure was carried out in 3 aspects, such as cavity optimization, the adjustment of feed port position and shim chamfering design, and the feasibility of the optimization plan was verified by tracking the start-up process of the external flow field. The results showed that 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 showed a tendency of thicker in the center area and thinner in the edge area with the increase of coating width, the thickness consistency was poor markedly. However, after the addition of the sub-cavity with a coating width of 1240 mm, the wet layer thickness consistency of the slurry 1 was improved from 26.88% to 9.79%. By further adjusting the single feed inlet design to a dual-feed inlet design, the wet layer thickness consistency of slurry 1 increased to 0.33%. In addition, the shim chamfering adjustment optimized the wall shear stress in the fluid domain at the edge of the outlet to improve the quality of the coating edge. Under the conditions of a coating speed of 60 m/min and the coating width of 1240 mm, the wet layer thickness consistency of slurry 1 was optimized to 0.28%. Comparison of numerical simulation results and experimental results showed that the average relative error was only 1.35%, indicating the accuracy of the slot-die structural design simulation model was good. Through the numerical simulation of the other 3 viscosity slurries, the consistency of wet film thickness was in the range of 0.38%-0.58%, and the results reflected the strong applicability of the designed model. The results of this study provide a reference for the optimized design of long slot-die head.

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

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