Coating Die Manifold Taper to Prevent Electrode Slurry Settling
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Solution Overview
Problem
In the manufacturing of secondary battery electrode plates, active materials tend to settle out in the manifold of a coating die, leading to inconsistent coating, performance degradation, and maintenance issues.
Innovation Solution
A coating die design featuring a manifold with first taper parts at its ends, where the dimension ratio of these taper parts in the first direction is 0.4 or less, to reduce the accumulation region of the coating material and prevent active material settling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the manifold is designed with a conventional shape, then the coating material can be stored, but active material settles out in the accumulation region
Solution Approach 1:
The manifold is designed with a curved bottom surface instead of a flat surface, creating a spherical or dome-shaped accumulation region. This curvature prevents active material from settling at a specific low point by ensuring all points on the bottom surface are equidistant from the center, thereby maintaining uniform coating quality and preventing clogging.
2Productivity
If the manifold volume is increased to ensure adequate coating material supply, then the coating process can be maintained, but the accumulation region increases and promotes active material settling
Solution Approach 1:
By curving the bottom surface of the manifold into a spherical shape, the design optimizes the accumulation region geometry. This allows adequate storage volume while preventing active material from concentrating at specific points, thus maintaining both productivity and coating precision.
3Device complexity
If the manifold is designed with straight passages and flat surfaces, then the structure is simple, but active material settles and causes clogging
Solution Approach 1:
The curved bottom surface design prevents active material accumulation and clogging, making the system easier to maintain. While the curvature adds some geometric complexity, it eliminates the need for frequent cleaning and troubleshooting related to clogging, thereby improving overall ease of operation and maintainability.
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 design effectively reduces the accumulation region of the coating material, preventing active material settling and ensuring uniform coating thickness, which enhances the performance and maintainability of secondary battery electrode plates.
Implementation Method 1
the second outline part includes, in an end region in a first direction, a first taper part tilted to be closer to the first outline part toward an end of the manifold in the first direction
Data Source
AI summary
A coating die includes a manifold, a supply port, a discharge port, a supply passage, and a discharge passage. The manifold, the discharge passage, and the discharge port are longer in a first direction, and an outline of the manifold viewed from a second direction includes a first outline part to which the discharge passage is connected and also includes a second outline part located opposite the first outline part. The second outline part includes a first taper part tilted to be closer to the first outline part toward an end of the manifold. When the dimension in the first direction from a connection part at which the supply passage is connected in the manifold to the end is set to 1, dimension ratio of the first taper part in the first direction is 0.4 or less.