Composite Multi-Slot Die Coater for Stable Thin-Layer Coating
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Solution Overview
Problem
Conventional multi-slot die coaters are structurally vulnerable to deformation and torsion due to thin die blocks, leading to instability in coating thickness and quality, particularly when forming multiple layers of electrode active material slurries, which affects the uniformity and productivity of secondary battery electrode manufacturing.
Innovation Solution
A multi-slot die coater design featuring die blocks with metal coating layers on ceramic bodies, including grooves for bolt fastening and chamfered die lips to reduce deformation and improve coating stability, allowing for precise adjustment of slot gaps and discharge ports to maintain uniform coating thickness and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the die block thickness is reduced to enable multi-slot coating, then the coating capacity and productivity are improved, but the structural stability and resistance to deformation deteriorate
Solution Approach 1:
The die block is constructed as a composite structure with a ceramic core (providing rigidity and deformation resistance) and a metal coating layer (providing machinability and surface properties). This composite design enables the thin die block to maintain structural stability while achieving multi-slot coating functionality.
Solution Approach 2:
The metal coating layer is applied selectively on the surface of the ceramic die block, particularly on regions requiring precision machining and contact with the coating head. This local quality approach maintains the overall rigidity of the thin structure while providing localized durability and machinability.
2Manufacturing precision
If the slot gap is reduced to achieve thinner coating layers, then the coating precision is improved, but the susceptibility to deformation increases
Solution Approach 1:
The ceramic core provides exceptional rigidity that maintains the slot gap precision even at reduced thicknesses, enabling thin coating layers to be applied with high uniformity without the die block deforming under operational loads.
Solution Approach 2:
The die block thickness is optimized to a specific range (10-20 mm) that balances the ability to form precise slot gaps for thin coating layers with sufficient structural rigidity to resist deformation during the coating process.
3Adaptability or versatility
If multiple die blocks are assembled to form multiple slots, then the coating versatility and productivity are improved, but the assembly complexity and potential for misalignment increase
Solution Approach 1:
The intermediate die block features an asymmetric inclined surface that interfaces with corresponding surfaces on the upper and lower die blocks. This asymmetric design creates a self-aligning mechanism that simplifies assembly and ensures precise alignment of multiple slots without requiring complex alignment procedures.
Solution Approach 2:
The multi-slot die coater is divided into separable die blocks (upper, intermediate, lower) that can be assembled and disassembled independently. Each block is designed with specific geometric features that facilitate precise alignment when assembled, reducing assembly complexity while maintaining multi-layer coating capability.
4Volume of moving object
If the die block is made thinner to reduce device footprint, then the compactness is improved, but the resistance to torsion and deformation deteriorates
Solution Approach 1:
The ceramic core provides exceptional rigidity and torsion resistance in a compact form, enabling the die block to be made thinner while maintaining structural integrity. The metal coating layer adds a small amount of mass that further enhances resistance to deformation without significantly increasing the device footprint.
Data Source
AI summary
A multi-slot die coater which can improve a problem of structural vulnerability to deformation and torsion. The multi-slot die coater including a lower slot and an upper slot includes a lower die block; an intermediate die block disposed on the lower die block to form the lower slot therebetween; and an upper die block disposed on the intermediate die block to form the upper slot therebetween, wherein at least one of the lower die block, the intermediate die block, and the upper die block includes a metal coating layer on a ceramic body.