Electrode Surface Airflow Layout to Overcome Coanda Loss
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Solution Overview
Problem
Conventional foreign matter removal devices for battery electrode surfaces suffer from reduced efficiency due to air being concentrated on the extension unit rather than the electrode surface, leading to lower foreign matter removal rates and increased air consumption and noise.
Innovation Solution
A foreign matter removal device with a blowing unit and suction unit forming acute angles with the electrode transfer direction, featuring a slit-shaped blowing unit and suction unit, an extension unit with a recessed adjustment unit to minimize the Coanda effect, and a protrusion to direct airflow effectively onto the electrode surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air flow rate is increased to improve foreign matter removal efficiency, then foreign matter removal efficiency is improved, but air consumption increases and noise is generated
Solution Approach 1:
The blowing unit is configured to concentrate air flow locally on the electrode surface rather than dispersing it broadly. The blowing unit includes a blowing hole that directs air flow precisely where foreign matters need to be removed, creating a localized high-velocity jet that achieves effective foreign matter removal with lower overall air consumption
Solution Approach 2:
The invention introduces a vertical dimension to air flow delivery by directing air flow downward onto the electrode surface from above. This vertical orientation allows the air jet to impinge directly on foreign matters and propel them toward the suction unit, improving removal efficiency without requiring increased horizontal air flow volume
2Productivity
If air flow rate is increased to improve foreign matter removal efficiency, then foreign matter removal efficiency is improved, but noise is generated
Solution Approach 1:
By concentrating air flow into a focused jet from the blowing hole, the system achieves effective foreign matter removal with lower overall air flow rates. This localized approach reduces turbulent air movement and associated noise while maintaining sufficient velocity at the target area to effectively remove foreign matters
3Device complexity
If conventional blowing and suction units are used, then device structure is simple, but air is concentrated on the extension unit rather than the electrode surface due to Coanda effect, reducing foreign matter removal efficiency
Solution Approach 1:
The blowing unit is positioned to deliver air flow in a vertical direction onto the electrode surface, counteracting the horizontal attachment tendency caused by the Coanda effect. This dimensional change in air flow direction ensures that air is concentrated on the electrode surface where foreign matters are located, rather than adhering to the extension unit
Solution Approach 2:
Instead of allowing air flow to naturally attach to the extension unit surface (Coanda effect), the invention inverts the approach by directing air flow perpendicular to the extension unit surface and onto the electrode. This reversal of the natural attachment tendency prevents air concentration on the extension unit and redirects it to the target area
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 device significantly improves foreign matter removal efficiency by concentrating air on the electrode surface, reducing product defects, and enhancing the reliability and uniformity of battery production.
Implementation Method 1
the air blown from the blowing unit 12 tends to be concentrated on the lower surface of the extension unit 16 between the blowing unit 12 and the suction unit 14, rather than the electrode E, due to the Coanda effect
Implementation Method 2
a suction unit 14 that sucks foreign matters separated from the electrode surface
Data Source
AI summary
A foreign matter removal device according to an embodiment of the present disclosure removes foreign matters on the surface of an electrode that is continuously transferred along one direction, and includes a blowing unit that blows air toward the electrode surface, a suction unit that sucks foreign matters separated from the electrode surface, and an extension unit extending between the blowing unit and the suction unit, wherein the extension unit is formed with an adjustment unit recessed in a direction away from the electrode surface.