Battery Pole Piece Roller Layout for Uniform Dual-Side Coating
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Solution Overview
Problem
Lithium-ion battery electrode pole pieces experience uneven powder thickness due to substrate jitter during production, leading to swelling issues and powder loss, affecting battery performance.
Innovation Solution
A battery pole piece forming apparatus with a press roller mechanism comprising four rollers arranged in sequence, where the second and third rollers pass the substrate vertically, and the first and fourth rollers roll-press active substance particles to form membranes of uniform thickness, ensuring even distribution on both sides of the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a powder calendering device with two press rollers is used to compression mold powder on both sides of a substrate, then the battery pole piece can be produced efficiently, but the substrate is prone to jitter during conveyance causing uneven powder thickness on two sides
Solution Approach 1:
The press roller mechanism is segmented into four independent rollers (first, second, third, and fourth press rollers) arranged in sequence. The first and second rollers form a first press roller mechanism, while the third and fourth rollers form a second press roller mechanism. This segmentation allows each roller to independently control powder compression on different sides of the substrate, ensuring uniform thickness despite substrate jitter during conveyance.
2Ease of manufacture
If the substrate is conveyed through the press rollers, then the battery pole piece can be formed, but substrate jitter causes powders to have different thicknesses on two sides
Solution Approach 1:
The press roller mechanism applies different local compression qualities to different sides of the substrate. The first press roller and second press roller apply compression to one side, while the third press roller and fourth press roller apply compression to the other side. This local quality control ensures that each side of the substrate receives appropriate pressure compensation, maintaining uniform powder thickness despite substrate movement during conveyance.
3Productivity
If uneven powder thickness occurs on the substrate, then the battery pole piece can still be produced, but the pole piece swells differently in different areas affecting battery performance
Solution Approach 1:
The press roller mechanism performs preliminary compression action on the powder before the substrate is fully conveyed and before any swelling can occur. By compressing the powder to uniform thickness on both sides of the substrate in advance, the system prevents subsequent differential swelling that would compromise battery reliability and operational stability.
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 ensures uniform thickness of the battery pole piece, preventing powder loss and enhancing the operational stability and safety of lithium-ion batteries by maintaining consistent active substance distribution.
Implementation Method 1
The first press roller and the second press roller are configured to roll-press active substance particles conveyed by the feeding mechanism to form a first membrane
Implementation Method 2
The first press roller and the second press roller are configured to roll-press active substance particles conveyed by the feeding mechanism to form a first membrane
Data Source
AI summary
A battery pole piece forming apparatus includes a conveying mechanism configured to convey a substrate; a feeding mechanism; and a press roller mechanism. The press roller mechanism includes a first press roller, a second press roller, a third press roller, and a fourth press roller arranged side by side in sequence. The first press roller and the second press roller are configured to roll-press active substance particles conveyed by the feeding mechanism to form a first membrane. The third press roller and the fourth press roller are configured to roll-press active substance particles conveyed by the feeding mechanism to form a second membrane. The second press roller and the third press roller are configured to roll-press the first membrane and the second membrane onto one side of the substrate (and another side of the substrate respectively.