Porous Extrusion Coating for Uniform Battery Electrode Slurry Flow
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Solution Overview
Problem
Existing methods for preparing battery electrode plates, such as wet and dry coating technologies, face challenges with uneven distribution of binders and conductive agents, high energy consumption, environmental concerns, and difficulty in achieving consistent coating speeds, especially with high-viscosity electrode slurries containing low solvent content.
Innovation Solution
An extrusion coating apparatus with a porous structure is used, featuring through holes of varying cross-sectional sizes and porosities arranged along the material flow path, allowing for adjustable flow rates and even material distribution, which helps in achieving consistent coating speeds and improving electrode plate quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wet or dry coating technologies are used for preparing electrode plates, then coating can be achieved, but uneven distribution of binders and conductive agents occurs and manufacturing precision deteriorates
Solution Approach 1:
The patent employs a porous die with controlled pore structures to enable uniform extrusion of electrode slurry. The porous material allows consistent flow distribution of high-viscosity slurry containing binders and conductive agents, ensuring even coating without the distribution problems of conventional wet or dry coating methods
Solution Approach 2:
The patent changes the physical parameters of the die (porosity, pore size distribution, pore shape) to control the extrusion characteristics of the electrode slurry. By adjusting these parameters, uniform flow and distribution of coating materials are achieved, resolving the inconsistency issues of traditional coating technologies
2Use of energy by stationary object
If conventional coating methods are used, then coating process can be completed, but energy consumption increases due to high-temperature drying requirements
Solution Approach 1:
The patent replaces the thermal drying process with a mechanical extrusion process. By using a porous die to control slurry flow and formation, the need for high-temperature drying is eliminated or significantly reduced, thereby lowering energy consumption and thermal energy loss associated with conventional coating and drying operations
3Object-affected harmful factors
If conventional coating methods are used, then coating can be applied, but environmental harm increases due to solvent emissions and pollution
Solution Approach 1:
The patent replaces solvent-based wet coating with a mechanical extrusion process using a porous die. This substitution eliminates or minimizes the use of volatile organic solvents, thereby reducing environmental pollution and harmful emissions while maintaining effective coating of electrode plates
4Object-affected harmful factors
If high-viscosity electrode slurry with low solvent content is used, then environmental impact is reduced, but coating speed consistency becomes difficult to achieve
Solution Approach 1:
The porous die with specifically designed pore structures enables consistent flow and extrusion of high-viscosity electrode slurry with low solvent content. The pore distribution and size control the flow characteristics, ensuring uniform coating speed and consistency even with environmentally friendly, low-solvent formulations that would otherwise be difficult to process
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 apparatus ensures even extrusion speed and distribution of high-viscosity electrode slurries, reducing environmental impact and energy consumption, while enhancing the quality and consistency of battery electrode plates.
Implementation Method 1
a porous structure disposed in the inner chamber and located on a material flow path between the feed port and the coating outlet, so that at least a portion of a material passes through the porous structure
Implementation Method 2
the porous structure has at least three through holes, the at least three through holes include at least two groups of through holes, and the at least two groups of through holes are differed in at least one of through hole cross-sectional size and porosity
Data Source
AI summary
An extrusion coating apparatus includes a housing having an inner chamber, a housing wall of the housing having a feed port and a coating outlet both communicated with the inner chamber, the coating outlet being in a slit shape; and further includes a porous structure disposed in the inner chamber and located on a material flow path between the feed port and the coating outlet, so that at least a portion of a material passes through the porous structure.