Battery Electrode Coating Die for Uniform Slurry Pressure
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Solution Overview
Problem
The existing coating processes for battery electrode plates face challenges in achieving consistent thickness due to uneven pressure distribution of the slurry, leading to inconsistent coating quality which affects battery safety, capacity, and lifespan.
Innovation Solution
A coating die with a distributary channel system that disperses the slurry through multiple flow channels and confluence chambers to uniform pressure, ensuring even application and improved consistency in coating thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple coating die structure is used, then the device complexity is low, but the coating thickness consistency deteriorates due to uneven pressure distribution
Solution Approach 1:
The coating die is segmented into multiple functional flow channels: a first flow channel for main slurry transport, multiple second flow channels for pressure distribution, and multiple third flow channels for further uniformity. This segmentation divides the slurry flow path into stages, with each channel group performing a specific function to progressively improve pressure uniformity and coating thickness consistency.
Solution Approach 2:
The confluence chamber acts as an intermediary component that collects slurry from multiple second flow channels and redistributes it through third flow channels. This intermediary structure buffers pressure variations and ensures uniform slurry delivery to the coating outlet, resolving the contradiction between simple structure and coating precision.
2Device complexity
If slurry flows directly to the discharge outlet, then the device complexity is low, but the pressure uniformity deteriorates leading to inconsistent coating quality
Solution Approach 1:
The flow path is segmented into multiple stages: the first flow channel delivers slurry to the confluence chamber, which then distributes it through multiple second flow channels, and finally through third flow channels to the discharge outlet. This multi-stage segmentation ensures pressure equalization at each stage, achieving uniform slurry pressure without excessive device complexity.
Solution Approach 2:
The confluence chamber performs preliminary action by collecting and buffering slurry from multiple second flow channels before distribution through third flow channels. This preliminary pressure equalization prevents pressure surges and ensures uniform slurry flow reaches the discharge outlet, improving coating quality.
3Manufacturing precision
If multiple flow channels and confluence chambers are added, then the coating thickness consistency improves, but the device complexity increases
Solution Approach 1:
The complex coating die is segmented into modular functional units: feed inlet, first flow channel, confluence chamber, multiple second flow channels, multiple third flow channels, and discharge outlet. Each module performs a specific function, making the complex system manageable and maintainable while achieving superior coating consistency.
Solution Approach 2:
The confluence chamber serves multiple functions: it collects slurry from second flow channels, buffers pressure variations, and distributes slurry through third flow channels. This multi-functionality reduces the need for separate components, managing device complexity while maintaining coating precision.
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 enhances the consistency of the coating thickness, thereby improving the performance and reliability of battery electrodes by reducing pressure differences and ensuring uniform slurry distribution across the base material.
Implementation Method 1
the plurality of second flow channels can disperse the slurry to reduce the pressure difference of the slurry among the second flow channels and improve the uniformity of the pressure of the slurry
Implementation Method 2
The first confluence chamber can collect the slurry from the plurality of second flow channels to achieve the effect of the buffering and uniform pressure
Data Source
AI summary
A coating die configured to apply a slurry onto a base material. The coating die includes a feed inlet, a distributary channel, a first confluence chamber and a discharge outlet. The feed inlet is configured to inject the slurry. The distributary channel is provided inside the coating die. The distributary channel includes a first flow channel and a plurality of second flow channels. The first flow channel communicates the feed inlet with the plurality of second flow channels, and the plurality of second flow channels is provided to be spaced from one another in a first direction. The first confluence chamber is provided inside the coating die and communicated with the plurality of second flow channels to collect the slurry from the plurality of second flow channels.