Vacuum Double-Pipe Slurry Transfer for Uniform Battery Coating
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Solution Overview
Problem
The existing methods for applying electrode slurry to current collectors in secondary battery manufacturing result in non-uniform thickness due to temperature variations, leading to inconsistent rolling rates and densities.
Innovation Solution
A device with a slurry transfer pipe having a vacuum double pipe structure, including a first pipe connected to the slurry tank and slot die, and a second pipe spaced apart to form a vacuum space, maintains a constant temperature of the electrode slurry during transfer, ensuring uniform application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the slurry transfer pipe uses a simple single-pipe structure, then the device complexity is low, but the temperature control precision deteriorates leading to non-uniform slurry application
Solution Approach 1:
The patent implements a nested pipe structure where an inner pipe is placed inside an outer pipe, forming a double-pipe configuration. The inner pipe transports slurry while the outer pipe provides thermal insulation, creating a nested arrangement that maintains slurry temperature without excessive structural complexity
Solution Approach 2:
The patent introduces an intermediary substance (insulation material or fluid) between the inner and outer pipes to mediate thermal transfer. This intermediary layer prevents heat exchange between the slurry and external environment, maintaining temperature control while keeping the overall structure relatively simple
2Manufacturing precision
If the slurry temperature varies during transfer, then the device operation is simple, but the manufacturing precision deteriorates due to non-uniform application thickness
Solution Approach 1:
The nested double-pipe structure provides a controlled thermal environment for slurry transfer, isolating the slurry in the inner pipe from external temperature variations. This nesting arrangement maintains consistent slurry temperature throughout the transfer process
Solution Approach 2:
The space between the inner and outer pipes creates a thermally isolated environment, effectively acting as an inert thermal barrier. This isolated environment prevents unwanted heat exchange, maintaining slurry temperature stability during transfer
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
This approach ensures a uniform thickness of the electrode slurry across the current collector, reducing defective rates in electrode manufacturing by maintaining consistent application temperatures.
Implementation Method 1
a vacuum space between the first pipe and the second pipe
Data Source
AI summary
A device for coating an electrode slurry for a secondary battery and a method of coating an electrode slurry, which include a slurry transfer pipe with a dual structure including first and second pipes so that a temperature of the electrode slurry temperature can be kept constant when the electrode slurry stored in a slurry tank is transferred to a slot die. Accordingly, the electrode slurry is uniformly applied to a current collector so that a defective rate in electrode manufacturing can be reduced.