Belt-like Electrode Stretching Roll Configuration for Wrinkle Prevention
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Solution Overview
Problem
The existing apparatus for manufacturing belt-like electrodes generates wrinkles in the non-forming part of the current collector foil during the stretching process, which can lead to foil breakage and curvature issues, especially when increasing the press amount to improve electrode density.
Innovation Solution
An apparatus with a stretching roll configuration that includes a first roll opposed to the electrode mixture layer and a pair of second rolls opposed to the non-forming part, where the central axis of the first roll is deviated from the central axis of the second rolls, allowing a recessed step that gradually increases and decreases as the foil is stretched, preventing wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the press amount of the forming part is increased to improve electrode density, then the electrode density is improved, but the stretch amount of the non-forming part must be increased as well, which causes wrinkles to be generated easily in the non-forming part
Solution Approach 1:
The stretching roll is divided into three distinct sections: a first roll opposed to the electrode mixture layer, and a pair of second rolls arranged at the ends of the first roll and opposed to the non-forming part. This segmentation allows independent control of stretching forces applied to different regions of the current collector foil, enabling the non-forming part to be stretched without generating wrinkles while maintaining the press amount for the forming part.
Solution Approach 2:
The stretching roll applies different stretching characteristics to different parts of the current collector foil. The first roll contacts and stretches the forming part with the electrode mixture layer, while the pair of second rolls contacts and stretches the non-forming part where the current collector foil is exposed. This local differentiation allows optimized stretching for each region, preventing wrinkles in the non-forming part while achieving desired electrode density in the forming part.
2Ease of operation
If the non-forming part is stretched using a stretching roll with a small-diameter part opposed to the electrode mixture layer and a large-diameter part opposed to the non-forming part, then the non-forming part can be stretched, but wrinkles are generated in the vicinity of the boundary between the non-forming part and the forming part
Solution Approach 1:
Instead of using a single stretching roll with varying diameter, the invention segments the stretching function into multiple independent rolls: a first roll for the forming part and a pair of second rolls for the non-forming part. This eliminates the boundary region where diameter transitions occur, thereby preventing wrinkle generation at the boundary between forming and non-forming parts.
Solution Approach 2:
The first roll acts as an intermediary element between the pressing mechanism and the pair of second rolls. It transfers the stretching action from the non-forming part to the forming part in a controlled manner, ensuring smooth interaction between different sections and preventing wrinkle formation at the boundary.
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 configuration effectively prevents wrinkles in the non-forming part, ensuring the integrity of the current collector foil and maintaining electrode density improvements without foil breakage, with a significant reduction in wrinkle occurrence compared to traditional methods.
Implementation Method 1
a stretching roll configured to stretch a non-forming part in which the electrode mixture layer is not formed and the current collector foil is exposed in respective ends of the current collector foil in a width direction
Implementation Method 2
the current collector foil in which the electrode mixture layer is formed is pressed in a thickness direction. Due to this pressing process, the electrode mixture layer is compressed and the electrode density of the belt-like electrode to be manufactured can be improved
Data Source
AI summary
A method for manufacturing an electrode belt that includes pressing a belt-shaped current collector foil with an electrode mixture layer along a longitudinal direction in a thickness direction of the electrode mixture layer so that the electrode mixture layer is formed on a part of the current collector foil, and stretching, by a stretching roll, a non-forming part of the current collector foil in which the electrode mixture layer is not formed and in which the current collector foil is exposed in respective ends in a width direction. The stretching roll includes a first roll opposed to the electrode mixture layer, and a pair of second rolls arranged in respective ends of the first roll in an axial direction and opposed to the non-forming part. A central axis of the first roll is deviated with respect to a central axis of the pair of second rolls.