Flexible Conveyor Plate Curvature for Electrode Stacking
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Solution Overview
Problem
The existing stacking apparatus for lithium ion secondary batteries causes extreme bending stress at the peripheral parts of sheet-shaped electrodes, leading to damage and cracking when alternately stacking bag-type positive and negative electrodes, due to the turn-up action of clamp arms during the stacking process.
Innovation Solution
A stacking apparatus and method utilizing a flexible conveyor plate with an adjustment mechanism to deform from a flat state to a curved state, allowing the new sheet-shaped member to be aligned and pressed against the center of the already stacked members, thereby reducing peripheral stress and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If clamp arms are used to press down the four corners of the topmost electrode while stacking, then the stacking process can be completed, but the peripheral parts of the new electrode are lifted and turned up causing extreme bending stress and damage
Solution Approach 1:
A curved pressing member is introduced as an intermediary tool between the clamp arms and the electrode. This pressing member has a curved surface that contacts the peripheral parts of the electrode first, allowing gradual deformation from the edges toward the center, thereby reducing extreme bending stress while still enabling the stacking process to be completed
2Ease of operation
If the peripheral parts of the sheet-shaped electrode are turned up during stacking, then the stacking operation can proceed, but the outer circumferential edges are damaged and the electrode cracks or breaks
Solution Approach 1:
The pressing member is designed with a curved surface instead of a flat one. This curvature allows the pressing force to be applied gradually from the peripheral parts toward the center of the electrode, preventing sudden turning up of the edges and maintaining electrode integrity throughout the stacking operation
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 approach enables accurate stacking of sheet-shaped members without excessive bending stress at the peripheral parts, ensuring precise alignment and preventing damage to the electrodes during the stacking process.
Implementation Method 1
making the conveyor plate deform from a flat state to a curved state
Data Source
AI summary
A stacking apparatus provided with a flexible conveyor plate (20), a clamp mechanism (25) for holding a sheet-shaped member carried on the conveyor plate (20) against the conveyor plate (20), and an adjustment mechanism able to adjust the degree of curvature of the conveyor plate (20). When stacking a new sheet-shaped member (1) carried on the conveyor plate (20) onto already stacked sheet-shaped members (1), the adjustment mechanism makes the conveyor plate (20) deform from a flat state to a curved state to make the new sheet-shaped member (1) carried on the conveyor plate (20) deform from a flat state to a curved state.