锂离子电池浆料狭缝式涂布初期流场模拟研究

Simulation study on initial flow of slot-die coating for lithium-ion battery paste

锂离子动力电池极片涂布过程具有浆料粘度大、涂层厚、基材薄、精度要求高等特点,目前广泛采用狭缝挤压式涂布技术。采用实验和流体力学有限元分析方法对锂离子电池负极浆料在铜箔基材上的狭缝式涂布初期流场进行分析,结果表明模拟得到的涂层厚度与实验结果吻合,说明计算模型可靠。当浆料入口速度为0.035 m/s时,外流场区域被基材带走的浆料能及时得到补充,上流道和下流道均能在最短的时间内稳定,这是最佳的涂布操作工艺范围。

The electrode coating of lithium-ion battery is a high-precision process with highly viscous slurry,large coating thickness and thin substrate.Now slot-die coating is actually the most used coating method for the electrode manufacturing of lithium-ion battery.The experimental and numerical methods were used to analyze the initial flow of lithium-ion battery anode slurries coated on the copper film.The results show that the numerical model is fairly reliable because the simulated result of the wet film thickness is close to the experiment one,and the inlet velocity of 0.035 m/s is the best coating process condition,in which,the slurries taken away by the moving web can be timely supplied from the inlet,therefore both above and below flows can be stable in the shortest time.