电极浆料涂布模头流场分析与结构优化  

Flow field analysis and structural optimization of coating die with electrode slurry

作　　者：杨家沐 陈育新 练成 徐至 刘洪来 YANG Jiamu;CHEN Yuxin;LIAN Cheng;XU Zhi;LIU Honglai(State Key Laboratory of Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology;School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]化学工程联合国家重点实验室,华东理工大学化工学院 [2]华东理工大学化学与分子工程学院,上海200237

出　　处：《储能科学与技术》2024年第4期1109-1117,共9页Energy Storage Science and Technology

基　　金：国家自然科学基金(22278127);中央高校基本科研业务费专项(2022ZFJH004)。

摘　　要：涂布工艺是锂电池极片制造过程的关键工序之一,涂层的稳定性和厚度一致性决定了极片的结构,进而影响电池的性能和循环寿命。大尺寸动力锂电池产品对涂布幅宽提出更高的要求,保证涂布模头出口处电极浆料的流动均匀性成为核心技术问题之一。因此,对涂布模头的流道结构进行合理优化显得尤为重要。本研究针对宽幅涂布模头出口速度分布不均的问题,构建了不同尺寸和结构的模头流道模型进行流场仿真,分析电极浆料在模头内部的流动特性,并采用Box-Behnken设计对衣架式模头的结构尺寸进行优化。具有倾斜变径式匀料腔结构的衣架式模头对浆料有更强的引流效果,有助于提升幅宽方向浆料流动的均匀性。采用Box-Behnken设计对衣架式模头的主要结构参数进行优化,使浆料的均匀性提升至0.99。The coating process is one of the key processes in the manufacturing of lithium battery electrodes.The stability and consistency of the coating determine the structure of the electrode,which in turn affects the performance and cycle life of the battery.As large-sized power lithium battery products had higher requirements for coating width,one of the core technical issues is how to ensure the flow uniformity of electrode slurry at the outlet of the coating die.Therefore,rational design of the flow channel structure of the coating die is crucial.This study aims to address the issue of inhomogeneous velocity distribution at the outlet of the wide coating die,and constructs die head flow channel models with different sizes and structures for flow field simulation.The flow characteristics of electrode slurry inside the die head are analyzed,and the structural dimensions of the coat-hanger die are optimized by using Box-Behnken design.The coat-hanger die with an inclined variable-diameter homogenizing cavity had a stronger drainage effect on the slurry,helping to improve the flow uniformity in the width direction.Adjustments to the die structure dimensions significantly impacted flow uniformity.The main structural parameters of the coat-hanger die were optimized using Box-Behnken design,resulting in an increase in the uniformity of the slurry to 0.99.

关 键 词：锂离子电池 狭缝涂布 衣架式模头 计算流体力学 BOX-BEHNKEN设计 

分 类 号：TQ024.1[化学工程]