Battery Electrode Roll Pressing to Prevent Uncoated Portion Wrinkles
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Solution Overview
Problem
The roll press method for producing electrode plates in rechargeable batteries often results in defects and wrinkles in the uncoated portions due to the shape of the coated portions, making it difficult to apply the roll press effectively and leading to quality degradation.
Innovation Solution
A device and method that apply a label to the uncoated portion between the coated portions, using a label applicator and separator to distribute pressing stress evenly, minimizing elongation differences and preventing wrinkles by pressing the coated portions together with the label and then removing it to reduce stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the roll press method is applied to press the electrode plate to improve coating density, then the density of the coated portion is improved, but wrinkles and defects occur in the uncoated portion
Solution Approach 1:
A label is introduced as an intermediary material applied to the uncoated portion before pressing. The label acts as a mediator that absorbs and distributes pressing stress evenly across the uncoated portion, preventing wrinkle formation while allowing the coated portions to be pressed to the desired density. After pressing, the label is removed leaving no residue on the electrode plate.
Solution Approach 2:
The label is applied to the uncoated portion in advance before the pressing operation. This preliminary application of the label provides cushioning protection to the uncoated portion, which would otherwise be vulnerable to wrinkle formation during the pressing process. The label absorbs the mechanical stress before it can cause damage to the electrode plate structure.
2Productivity
If the roll press method is applied to improve electrode plate density, then productivity is improved, but quality degradation occurs due to uncoated portion defects
Solution Approach 1:
The label serves as a temporary intermediary that enables the roll press method to be applied without quality degradation. By placing the label on the uncoated portion before pressing and removing it after pressing, the process maintains both high productivity and high quality, as the label prevents defects while allowing continuous production.
Solution Approach 2:
The label is applied temporarily during the pressing process and then discarded (removed) after serving its protective function. This approach allows the pressing operation to proceed at high speed without compromising quality, as the label is quickly applied and removed in an automated process that does not bottleneck production.
3Ease of manufacture
If pressing is applied to the electrode plate without label protection, then the pressing operation can be performed directly, but stress concentration causes elongation differences and wrinkles
Solution Approach 1:
The label acts as a stress-distributing intermediary between the press and the uncoated portion. While this adds a step to the manufacturing process, it ensures uniform stress distribution across the uncoated portion, preventing elongation differences and wrinkle formation. The label's presence during pressing maintains the structural stability of the electrode plate.
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 significantly reduces wrinkle formation in the uncoated portions, improving the quality and productivity of the electrode plates by maintaining even stress distribution and preventing cracking or breakage, with wrinkles minimized to within a maximum range of 0.05 times the width on each side.
Implementation Method 1
a roll press configured to press the first coated portion and the second coated portion of the electrode plate in which the label is applied to the uncoated portion together with the label
Implementation Method 2
a label separator configured to separate the pressed label from the uncoated portion of the pressed electrode plate
Data Source
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AI summary
A device for pressing an electrode plate (EP) of a rechargeable battery, the device including an uncoiler (10) configured to supply a label from an inflow side of an electrode plate (EP) having a first coated portion and a second coated portion coated with an active material slurry and an uncoated portion between the first coated portion and the second coated portion, a label applicator (20) configured to apply the label to the uncoated portion, a roll press (30) configured to press the first coated portion and the second coated portion of the electrode plate (EP) in which the label is applied to the uncoated portion together with the label and a label separator (40) configured to separate the pressed label from the uncoated portion of the pressed electrode plate (EP).