Electrode Plate Drying Nozzle With Slit Inlet for Uniform Gas Flow
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Solution Overview
Problem
The existing drying processes for electrode plates in secondary batteries face challenges due to deviations in the flow rate and/or flow velocity of drying gas, leading to non-uniform drying, cracks, bending, and reduced quality of the electrode plates, especially for wide electrode plates.
Innovation Solution
A gas injection nozzle and a drying apparatus are designed to reduce deviations in flow rate and/or flow velocity across the electrode plate by using a nozzle body with a flow space between two plates, inlet holes with a slit shape, and injection holes, along with a deflector to disperse and uniformize the drying gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional drying process is used for 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, leading to non-uniform drying quality
Solution Approach 1:
The gas injection nozzle is divided into multiple independent injection holes (e.g., 3-5 holes) arranged along the width direction. Each injection hole independently supplies drying gas to a specific region of the electrode plate, allowing localized control of flow rate and velocity to achieve uniform drying across the entire plate width.
Solution Approach 2:
Different regions of the electrode plate receive drying gas with locally optimized parameters. The injection holes are positioned and configured to deliver appropriate flow rates and velocities to specific areas (center vs. sides), ensuring each region receives the precise amount of drying gas needed for uniform quality without excessive flow rate deviation.
2Productivity
If drying gas flow rate and velocity deviation is large, then the drying process can be completed quickly, but cracks and bending occur in the electrode plate, deteriorating its quality
Solution Approach 1:
By segmenting the gas supply into multiple injection holes, the total drying gas flow is distributed across several controlled outlets. This allows maintaining high overall productivity while each individual injection hole delivers gas at an optimized velocity that prevents electrode plate damage such as cracks and bending.
Solution Approach 2:
The injection holes are designed with specific diameter dimensions (e.g., 2-5 mm) and arrangements that optimize the flow velocity and pressure parameters of the drying gas. This parameter optimization ensures sufficient drying efficiency while preventing excessive velocity that would cause electrode plate defects.
3Device complexity
If a single inlet hole configuration is used, then the nozzle structure is simple, but large flow velocity deviation occurs across the width direction of the electrode plate
Solution Approach 1:
The single inlet hole is segmented into multiple injection holes (e.g., 3-5 holes) arranged along the width direction. This segmentation increases structural complexity only slightly while dramatically improving flow velocity uniformity across the electrode plate width, as each hole serves a specific region.
Solution Approach 2:
The nozzle body serves multiple functions: it distributes drying gas to multiple regions, controls flow velocity in each region, and maintains structural simplicity through a unified design. The multiple injection holes work together as an integrated system to achieve uniform flow distribution without requiring complex individual control mechanisms for each hole.
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, minimizing defects such as cracks and bending, and improves the overall quality of the electrode plate even for wide plates.
Implementation Method 1
a deflector disposed between the first plate and the second plate and configured to change a flow direction of the drying gas introduced through the at least one inlet hole
Implementation Method 2
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
AI summary
Embodiments of the present disclosure provide a gas injection nozzle for drying an electrode plate including a nozzle body having a flow space through which drying gas flows, the flow space being formed between a first plate and a second plate spaced apart from the first plate in a first direction; at least one inlet hole formed in the first plate and configured to allow the drying gas to flow into the flow space from the outside of the nozzle body; and a plurality of injection holes formed in the second plate and configured to inject the drying gas from inside of the flow space to the outside, wherein the at least one inlet hole has a slit shape crossing the first plate in a second direction.