Long Porous Separator Slitting for Lateral Surface Straightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The straightness of the lateral surface of long porous separator sheets used in batteries is critical to prevent tearing during processing, as existing technologies do not adequately address the distortion issues inherent in porous materials, leading to potential damage and inefficiencies in battery assembly.
Innovation Solution
A method involving a slitting process using an upper blade and a lower blade that rotate in different directions to form a lateral surface with a high straightness value (R/P < 1.04), reducing the likelihood of the separator sheet being torn during processing, by binarizing the image of the lateral surface to assess and improve its straightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional slitting methods are used to produce long porous separator sheets, then production efficiency is maintained, but the lateral surface straightness deteriorates (R/P value increases), causing the separator to be caught and torn during battery assembly
Solution Approach 1:
The invention changes the operational parameters of the slitting process by controlling the relative speeds of the upper and lower blades during slitting. Specifically, the upper blade rotates at a speed different from the lower blade, creating a speed ratio that optimizes the cutting action. This parameter change reduces lateral surface distortion and improves straightness (lowers R/P value), thereby preventing tearing during subsequent battery assembly processes
2Reliability
If the lateral surface straightness is improved by optimizing slitting parameters, then the risk of tearing during processing is reduced, but the device complexity increases due to the need for differential blade rotation control
Solution Approach 1:
The invention introduces dynamic control to the slitting mechanism by enabling differential rotation speeds between the upper and lower blades. Rather than using fixed-speed blades, the system dynamically adjusts the speed ratio during operation. This dynamic approach allows optimization of cutting performance to improve lateral surface straightness while maintaining flexibility in the slitting process
Solution Approach 2:
The invention implements feedback control by monitoring the actual speed ratio between upper and lower blades and adjusting the rotation speeds accordingly. This feedback mechanism ensures that the optimal speed ratio is maintained during slitting operations, consistent production quality is achieved, and the lateral surface straightness is controlled within specified tolerances
Data Source
AI summary
A lateral surface (12e) of a long separator sheet (12a, 12b) has a value of edge length (R)/longer side length (P) which is less than 1.04. It is therefore possible to provide the long porous separator sheet that is less likely to be torn in processing.