Slit-Inlet Drying Nozzle for Uniform Electrode Plate Drying
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Solution Overview
Problem
In the drying process of electrode plates for secondary batteries, deviations in the flow rate and/or flow velocity of drying gas can lead to uneven drying, resulting in defects such as cracks and bending, particularly for wide electrode plates.
Innovation Solution
A gas injection nozzle and drying apparatus designed to reduce deviations in flow rate and/or flow velocity across the electrode plate, featuring a nozzle body with a flow space between plates, inlet holes with a slit shape, and injection holes, optionally with a deflector to change the flow direction of the drying gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional gas injection nozzle is used for drying wide electrode plates, then the drying process can be completed, but large deviations in flow rate and flow velocity occur between the center and side parts, resulting in uneven drying quality
Solution Approach 1:
The nozzle body is divided into multiple injection holes distributed across the width of the electrode plate. Each injection hole independently injects drying gas, allowing localized control of flow distribution. This segmentation enables uniform drying across the entire width by addressing flow deviations at specific locations rather than treating the entire width as a single zone.
Solution Approach 2:
The invention implements local quality control by positioning injection holes at different locations (center and side parts) with potentially different configurations. Each region receives drying gas tailored to its specific flow characteristics, compensating for the natural tendency of gas flow to concentrate at the center and diminish at the sides. This localized adjustment ensures uniform drying quality across the entire electrode plate width.
2Reliability
If drying gas is injected onto wide electrode plates, then the active material can be dried, but cracks and bending occur due to large flow rate and flow velocity deviations depending on position
Solution Approach 1:
The nozzle body is divided into multiple injection holes distributed across the width of the electrode plate. Each injection hole independently injects drying gas, allowing localized control of flow distribution. This segmentation enables uniform drying across the entire width by addressing flow deviations at specific locations rather than treating the entire width as a single zone.
Solution Approach 2:
The invention implements local quality control by positioning injection holes at different locations (center and side parts) with potentially different configurations. Each region receives drying gas tailored to its specific flow characteristics, compensating for the natural tendency of gas flow to concentrate at the center and diminish at the sides. This localized adjustment ensures uniform drying quality across the entire electrode plate width.
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
The solution effectively reduces deviations in drying efficiency and quality, improving the uniformity of drying and reducing defects like cracks and bending, even for wide electrode plates, thereby enhancing the overall quality of the electrode plates.
Implementation Method 1
at least one inlet hole (130) formed in the first plate (111) and configured to allow the drying gas to flow into the flow space (120) from the outside of the nozzle body (110), and a plurality of injection holes (140) formed in the second plate (112) and configured to inject the drying gas from inside of the flow space (120) to the outside
Implementation Method 2
a deflector (150) disposed between the first plate (111) and the second plate (112) and configured to change a flow direction of the drying gas introduced through the at least one inlet hole (130)
Implementation Method 3
drying gas such as hot air is injected onto a sheet of the current collector coated with the active material to dry the active material
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The present disclosure provides a gas injection nozzle (100) for drying an electrode plate including: a nozzle body (110) having a flow space (120) through which drying gas flows, the flow space being formed between a first plate (111) and a second plate (112) spaced apart from the first plate (111) in a first direction; at least one inlet hole (130) formed in the first plate (111) and configured to allow the drying gas to flow into the flow space (120) from the outside of the nozzle body (110); and a plurality of injection holes (140) formed in the second plate (112) and configured to inject the drying gas from inside of the flow space (120) to the outside, wherein the at least one inlet hole (130) has a slit shape crossing the first plate (111) in a second direction, a longitudinal direction of the nozzle body (110).