Electrode Sheet Manufacturing Cutting and Pressing
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Solution Overview
Problem
The existing methods for manufacturing electrode sheets often result in wrinkles during the rolling process, which can lead to distortions and affect the quality of the electrode sheets, particularly in the production of secondary batteries.
Innovation Solution
A method and apparatus that involve cutting the original sheet between coated portions, followed by a pressing step using a pair of rolls to prevent interference and wrinkles, along with a distortion correcting step to address elongation differences between coated and uncoated portions, ensuring smooth conveyance and accurate cutting to produce uniform electrode sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the original sheet is rolled with rollers to increase the density of the electrode material, then the density is increased, but wrinkles occur in the metal foil
Solution Approach 1:
The original sheet is divided into multiple original sheet strips by cutting between the coated portions before the pressing step. This segmentation allows each strip to be pressed independently, preventing the metal foil from developing wrinkles during the density increase process, while still achieving the desired electrode material density.
Solution Approach 2:
The cutting step is performed preliminarily before the pressing step, dividing the original sheet into strips that will be pressed separately. This preliminary action prevents the harmful effect of wrinkles from occurring during the subsequent pressing operation, while still allowing the density increase to be achieved.
2Productivity
If multiple coated portions are arranged on a wide belt-shaped metal foil, then production efficiency is improved, but interference between adjacent portions occurs during pressing
Solution Approach 1:
The wide belt-shaped metal foil with multiple coated portions is divided into separate original sheet strips by cutting between the coated portions. This segmentation eliminates interference between adjacent coated portions during the pressing step, while still maintaining high production efficiency by processing multiple strips simultaneously or in sequence.
Solution Approach 2:
The uncoated portions between the coated portions are utilized as cutting regions to separate the original sheet into independent strips. This extraction approach allows the harmful interference between adjacent coated portions to be eliminated while preserving the beneficial high-density arrangement of multiple coated portions on the metal foil.
Data Source
AI summary
According to the method for manufacturing electrode sheets, in a first cutting step, an original sheet, including a belt-shaped metal foil and an electrode material coated thereon in a lengthwise direction to form a plurality of coated portions spaced at a predetermined gap, is cut at a location between the coated portions. In a pressing step, the original sheet strips having been cut in the first cutting step are pressed. In this case, the original sheet strips that are pressed by the rolling device are independent from each other. Therefore, the effect produced in rolling of the coated portions remains within each of the original sheet strips. In addition, distortions occurring in the original sheet strips can be prevented from affecting each other and the occurrence of wrinkles can be inhibited.