Secondary Battery Electrode Notching With Elastic Pad Wrinkle Removal
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Solution Overview
Problem
Existing secondary battery electrode manufacturing processes struggle to efficiently remove wrinkles from the uncoated portions of secondary battery electrodes, which can lead to adhesion issues and welding defects during battery assembly.
Innovation Solution
A secondary battery electrode notching apparatus is designed to include a die, a composite portion stripper, an uncoated portion stripper with an elastic pad, and a punch. The apparatus presses the uncoated portion with the elastic pad to move wrinkles away from the composite portion and into a scrap area, where they are cut off by the punch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the uncoated portion is pressed by a rigid stripper, then the pressing force is sufficient, but wrinkles cannot be effectively removed and may cause adhesion issues
Solution Approach 1:
The patent changes the physical parameter of the stripper from rigid to elastic by introducing an elastic pad. This allows the stripper to deform and apply distributed pressure that effectively removes wrinkles from the uncoated portion without causing adhesion issues, resolving the contradiction between sufficient pressing force and wrinkle removal capability.
Solution Approach 2:
The uncoated portion stripper combines a rigid stripper body with an elastic pad to create a composite structure. The rigid body provides structural support and positioning, while the elastic pad provides conformal contact and wrinkle removal capability, achieving both sufficient pressing force and effective wrinkle elimination.
2Reliability
If wrinkles are removed by pressing the uncoated portion, then adhesion improves, but the pressing mechanism becomes more complex
Solution Approach 1:
The patent simplifies the pressing mechanism by changing the material parameter of the stripper to elastic, which inherently provides the necessary conformal contact and pressure distribution for wrinkle removal. This eliminates the need for complex multi-component pressing mechanisms while achieving improved welding quality.
3Ease of manufacture
If the elastic pad is made uniformly thick, then the structure is simple, but wrinkles cannot be effectively moved to the scrap area
Solution Approach 1:
The patent applies local quality by making the elastic pad thickness non-uniform, with varying thickness in different regions. This allows the pad to exert different pressures at different locations, effectively moving wrinkles toward the scrap area while maintaining simple fabrication processes. The local thickness variation optimizes wrinkle removal without complicating manufacturing.
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 effectively removes wrinkles from the uncoated portions of secondary battery electrodes, improving adhesion at welded portions and reducing welding defects, thereby enhancing the productivity and quality of secondary battery production.
Implementation Method 1
including an elastic pad formed of an elastic material and configured to elastically deform to make surface contact with the uncoated portion
Data Source
AI summary
A secondary battery electrode notching apparatus, including a die configured to support a secondary battery electrode including a composite portion coated with an electrode active material and an uncoated portion not coated with the electrode active material; a composite portion stripper configured to move toward the die and press the composite portion into close contact with the die; an uncoated portion stripper configured to move toward the die, press the uncoated portion into close contact with the die, and including an elastic pad formed of an elastic material and configured to elastically deform to make surface contact with the uncoated portion; and a punch configured to move toward the die and cut the uncoated portion so that scrap for disposal is formed from the uncoated portion.