储能科学与技术2025，Vol.14Issue(6)：2339-2351,13.DOI:10.19799/j.cnki.2095-4239.2025.0093
锂离子电池极片狭缝式宽幅涂布模头的设计优化
Optimization of long slot-die head for Li-ion battery electrode coating
摘要
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.关键词
宽幅涂布/数值模拟/流道设计/内流场/外流场Key words
slot-die coating/numerical simulation/flow channel design/internal flow field/external flow field分类
化学工程引用本文复制引用
郎满权,杨军,张中春,彭建林,杨续来..锂离子电池极片狭缝式宽幅涂布模头的设计优化[J].储能科学与技术,2025,14(6):2339-2351,13.基金项目
安徽省重点研发计划项目(2023z04020004),合肥市自然科学基金项目(2023042). （2023z04020004）
