Pole Piece Edge Rolling to Prevent Wrinkling After Slitting
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Solution Overview
Problem
The production process of battery pole pieces often results in wrinkling due to inconsistent stress distribution after slitting, especially post-lithium replenishment, leading to increased rejection rates and safety risks.
Innovation Solution
A pole piece forming apparatus with a wrinkle removing device featuring first and second rollers with varying diameters and heat exchange capabilities, along with integrated lithium replenishment, deflection correction, burr treatment, and glue application, to uniformly distribute stress and prevent wrinkling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pole piece undergoes slitting process, then the pole piece is formed from master pole piece, but wrinkling occurs due to inconsistent stress distribution
Solution Approach 1:
The wrinkle removing device is installed between the slitting device and winding device to perform wrinkle removal action before the pole piece is wound. The first roller and second roller with varying diameters apply stress to the pole piece surface in advance, preventing wrinkles from forming during subsequent handling and winding processes.
Solution Approach 2:
The first roller and second roller are designed with diameters that change from small to large in the axial direction, creating non-uniform stress distribution across the pole piece width. This local variation in roller diameter allows targeted stress application to different regions of the pole piece surface, effectively addressing wrinkle formation at specific locations while maintaining overall surface quality.
2Manufacturing precision
If uniform stress distribution is achieved to prevent wrinkling, then pole piece quality improves, but device complexity increases
Solution Approach 1:
The wrinkle removing device combines the first roller and second roller into a single integrated assembly positioned between the slitting and winding devices. Both rollers work simultaneously to apply stress to opposite surfaces of the pole piece, achieving uniform stress distribution through a unified device structure rather than separate independent systems.
Solution Approach 2:
The first roller and second roller are designed with dynamic diameter variation along their axial directions, where the diameter changes from small to large. This dynamic geometric configuration allows the rollers to automatically adapt their stress distribution pattern to the width of the pole piece, creating uniform stress across the surface without requiring complex control systems or adjustable mechanisms.
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 reduces wrinkling, improves yield, and enhances safety by uniformly distributing stress and integrating processes, thereby improving the quality and reliability of battery production.
Implementation Method 1
the slitting edges of the pole pieces are rolled by the first rolling part of the first roller and the second roller
Implementation Method 2
the first roller is internally provided with a flow path for circulating a heat conductive medium, the heat conductive medium being used for heat exchange with the first roller
Data Source
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AI summary
The present application provides a sheet forming device, comprising a feeding unit, a slitting unit, a plurality of winding units, and a wrinkle removing unit. The feeding unit provides a parent sheet. The slitting unit slits the parent sheet into a plurality of sheets. The winding units pull a sheet belt. Each winding unit winds one corresponding sheet. The slitting unit is arranged between the feeding unit and the winding units. The wrinkle removing unit is arranged between the slitting unit and the winding units. The wrinkle removing unit comprises a first roller and a second roller which are oppositely arranged. The first roller comprises a first rolling part. The first rolling part and the second roller are used for rolling the edge of a slitting edge of a sheet. According to the sheet forming device provided by the present application, the slitting edge of the sheet is rolled by the first rolling part of the first roller and the second roller, so that the risk of forming wrinkles on a sheet after slitting of a parent sheet is effectively reduced, the yield of sheets is improved, and the safety of a battery, produced from the sheet, in a working process is improved.