Nozzle Plate Perforation Layout for Uniform Electrode Slurry Drying
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Solution Overview
Problem
Existing electrode-slurry-drying devices for secondary batteries face challenges in achieving uniform drying due to uneven airflow distribution, leading to quality issues and reduced process efficiency.
Innovation Solution
The proposed electrode-slurry-drying device incorporates a nozzle with a nozzle plate featuring perforations that are arranged based on the amount of undried solvent on the substrate, ensuring uniform gas flow and drying across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional dryer with uniform airflow design is used, then the device structure is simple, but the drying uniformity across the substrate is poor leading to quality issues
Solution Approach 1:
The nozzle plate is designed with non-uniformly distributed perforations where the density of perforations varies across different regions. Specifically, the central region has a higher density of perforations compared to the edge regions, creating localized differences in gas flow distribution that compensate for the natural airflow non-uniformity in conventional dryers. This local variation in perforation density achieves uniform drying across the entire substrate surface.
Solution Approach 2:
The nozzle plate is divided into multiple regions (central region and edge regions) with different perforation densities. Each region is independently designed with appropriate perforation numbers and distributions, allowing the system to address different drying requirements in different areas of the substrate simultaneously.
2Productivity
If the dryer operates with standard airflow circulation, then the operation is simple, but the drying speed is reduced due to uneven airflow distribution
Solution Approach 1:
The nozzle plate incorporates region-specific perforation densities that optimize gas flow distribution without requiring complex operational adjustments. The central region with higher perforation density receives more gas flow to compensate for the natural tendency of conventional dryers to have weaker airflow at the center, thereby achieving uniform and efficient drying across the entire substrate.
3Quantity of substance
If the number of perforations is increased uniformly across the nozzle plate, then the gas flow amount increases, but the drying uniformity deteriorates due to edge effects
Solution Approach 1:
Instead of uniformly increasing perforations, the design implements non-uniform distribution where the central region has higher perforation density and edge regions have lower density. This localized approach ensures that gas flow is appropriately distributed to each region's specific requirements, maintaining drying uniformity while achieving sufficient overall gas flow for efficient solvent evaporation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables uniform drying of the electrode slurry in the width direction, reducing regional variations in solvent drying and improving the quality and efficiency of the secondary battery manufacturing process.
Implementation Method 1
a nozzle configured to spray gas to dry an electrode slurry including a solvent applied on a substrate
Data Source
AI summary
An electrode-slurry-drying device according to one or more embodiments of the present disclosure includes a nozzle configured to spray gas to dry an electrode slurry comprising a solvent applied on a substrate; and a nozzle plate at an outlet of the nozzle, and defining perforations for discharging the gas toward the substrate, wherein a number of the perforations is determined based on an amount of undried solvent on the substrate.