Vacuum Electrode Coating Compression for Uniform Active Material Layers
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Solution Overview
Problem
Conventional methods for manufacturing lithium-ion battery electrodes face issues with active material layer uniformity due to air entrapment during compression, leading to potential popping or unevenness, which can affect battery performance.
Innovation Solution
A battery electrode manufacturing device and method that decompresses the environment below atmospheric pressure to supply and compress active materials on current collectors, minimizing air inclusion and enhancing layer uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If active material is supplied onto current collector in atmosphere and then compressed, then manufacturing process is simple, but air becomes trapped in active material layer causing popping and surface unevenness
Solution Approach 1:
The patent applies vacuum environment (inert atmosphere principle) by providing a processing chamber where the interior is evacuated to a predetermined vacuum degree before supplying active material and during compression. This prevents air from being trapped in the active material layer, eliminating popping and surface unevenness while maintaining manufacturing simplicity through automated chamber processing.
2Device complexity
If compression is performed in atmosphere, then equipment complexity is low, but air expansion after compression causes active material popping
Solution Approach 1:
The compression operation is performed inside a vacuum chamber where air has been evacuated. This inert environment prevents air trapped during compression from expanding after compression, thereby preventing active material popping and ensuring layer stability. The chamber design integrates compression equipment without significantly increasing overall system complexity.
3Loss of time
If active material layer is compressed in atmosphere, then processing time is short, but air remains in active material causing uneven compression
Solution Approach 1:
The patent applies preliminary action by evacuating the processing chamber to a predetermined vacuum degree before supplying active material and before compression. This preliminary vacuum treatment removes air from the environment, ensuring that no air becomes trapped during subsequent material supply and compression operations, thereby achieving uniform compression without increasing processing time.
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 effectively suppresses air inclusion during compression, improving the uniformity and performance of the active material layer on the current collectors, thereby enhancing battery stability and performance.
Implementation Method 1
a first chamber (100) whose interior is decompressed below atmospheric pressure
Data Source
AI summary
A battery electrode manufacturing device, which can suppress air from being contained in the active material and improve uniformity of an active material layer formed on a current collector, is provided. The battery electrode manufacturing device comprises: a first chamber whose interior is decompressed below atmospheric pressure; an active material supply unit that supplies a powdery active material onto a current collector, which is arranged in the first chamber; and a compressor that compresses the active material supplied on the current collector, wherein the active material supply unit and the compressor are arranged in the first chamber.