Electrode Sheet Bending for Inward-Leaning Cell Connecting Pieces
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Solution Overview
Problem
In the manufacturing of power storage cells, the connecting pieces of electrode plates tend to lean away from the winding core during the spiraling process, leading to potential structural issues and inefficiencies.
Innovation Solution
A method involving the preparation of electrode sheets with elongated current collecting foils, bending the end regions to form bent pieces, cutting to create connecting pieces that lean towards the winding core, and winding the sheets around a core to ensure the connecting pieces remain aligned with the core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode sheet is wound with the separator interposed, then the power storage cell is formed, but the connecting piece leans away from the winding core causing structural issues
Solution Approach 1:
The end region of the current collecting foil is bent before the winding process to pre-position the connecting pieces in the desired orientation. This preliminary bending action ensures that during winding, the connecting pieces lean toward the winding core rather than away from it, preventing structural issues.
Solution Approach 2:
The end region is bent in advance to counteract the natural tendency of connecting pieces to lean outward during winding. By pre-bending the foil, the connecting pieces are positioned to lean inward toward the winding core, opposing the harmful outward leaning that would otherwise occur.
2Manufacturing precision
If the current collecting foil is bent to form connecting pieces, then the connecting pieces can be positioned correctly, but the manufacturing process becomes more complex
Solution Approach 1:
The bending process changes the geometric parameters of the current collecting foil, specifically the curvature and angle of the end region. By controlling these geometric parameters during bending, the connecting pieces achieve precise positioning that leans toward the winding core during the subsequent winding process.
Data Source
AI summary
A method of manufacturing a power storage cell includes: a preparing step of preparing an electrode sheet including a current collecting foil and an active material layer; a bending step of bending the current collecting foil to form a bent piece; a cutting step of forming cuts in the bent piece to form connecting pieces separated from each other; and a winding step of winding the electrode sheet around a winding core. The current collecting foil prepared in the preparing step includes a main region provided with the active material layer and an end region not provided with the active material layer. In the bending step, the end region is bent with respect to the main region to form the bent piece in the end region. In the winding step, the electrode sheet is wound with each of the connecting pieces leaning toward the winding core.