Ceramic Coating Die Head for Uniform Battery Electrode Slurry Coating
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Solution Overview
Problem
Existing coating equipment results in non-uniform thickness of coated battery electrode pieces due to slurry scouring and wear on the coating die surfaces, affecting performance and yield.
Innovation Solution
A coating die with slot-forming surfaces made of ceramic materials, enhancing wear and corrosion resistance, and an integrated structure to prevent metal exposure and ensure uniform slurry coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal coating die is used for slurry coating, then coating speed and precision are improved, but the die surface suffers from scouring and wear due to slurry particles, reducing manufacturing precision and yield
Solution Approach 1:
The patent applies composite material principle by using ceramic material (such as aluminum oxide, silicon carbide, or diamond-like carbon coating) to manufacture the coating die. The ceramic material combines high hardness and wear resistance with smooth surface properties, creating a composite structure that resists slurry particle scouring while maintaining coating precision. This resolves the contradiction by providing a die material that withstands the abrasive slurry environment without compromising coating uniformity.
Solution Approach 2:
The patent changes the material parameter of the coating die from metal to ceramic. This parameter change fundamentally alters the die's resistance to wear and scouring from slurry particles. The ceramic material's higher hardness and chemical stability parameters enable the die to maintain its surface integrity and coating slot geometry over extended operation, thereby maintaining manufacturing precision while preserving high coating speed.
2Productivity
If metal coating die operates continuously with slurry, then productivity is maintained, but metal particles may mix into the slurry due to wear, affecting battery electrode piece performance
Solution Approach 1:
The ceramic material used in the coating die creates a non-metallic surface that does not shed metal particles during operation. The composite ceramic structure remains stable under continuous slurry flow, preventing contamination of the slurry with die material particles. This resolves the contradiction by eliminating metal particle generation while maintaining continuous operational capability.
Solution Approach 2:
The patent implies a shift from durable metal dies that eventually wear and contaminate to ceramic dies that have extended service life without shedding harmful particles. The ceramic material's resistance to wear and chemical stability effectively creates a long-lasting die that maintains purity throughout its operational life, eliminating the need for frequent replacement due to contamination concerns.
3Reliability
If ceramic material is used for slot-forming face, then wear and corrosion resistance are improved, but device complexity increases due to material selection and integration
Solution Approach 1:
The patent addresses complexity by selecting ceramic materials that can be manufactured as integrated components or easily bonded to metal supports. The ceramic material itself forms the slot-forming face, eliminating the need for complex composite structures or multiple layers. This resolves the contradiction by achieving high reliability through material selection while keeping the structural implementation relatively simple.
Solution Approach 2:
The patent may employ segmentation by separating the die into a support structure (metal) and a slot-forming face (ceramic). This segmentation allows each component to be optimized independently - the metal support provides mechanical strength while the ceramic face provides wear and corrosion resistance. This modular approach simplifies the overall design and manufacturing process while achieving high reliability.
Data Source
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AI summary
Disclosed are a coating die and coating equipment. The coating die comprises an upper die and a lower die, wherein a coating slot is formed between the upper die and the lower die, and the coating slot is configured for slurry circulation; in both the upper die and the lower die, a slot-forming surface for forming the coating slot is made of a ceramic material. According to the coating die provided by the present application, the slot-forming surface for forming the coating slot is made of the ceramic material, so that the wear resistance and corrosion resistance of the slot-forming surface for forming the coating slot are greatly improved in the coating process of slurry; and even if a small amount of ceramic material is worn and enters the slurry, the performance of the battery pole piece will not be affected, so that the yield of the finished battery pole piece is ensured.