Electrode Sheet Folding Line for Accurate Tab Bending
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Solution Overview
Problem
The challenge in forming electrochemical cells is ensuring that electrode sheets are reliably and consistently folded at the desired zones to prevent short circuits and ensure proper electrode alignment, as existing methods often result in unintended folding of electrode sheet portions not affected by tabs.
Innovation Solution
Structurally weakening the electrode sheet along a longitudinal path creates a preferential folding line, allowing tabs to be easily rotated and folded when pressure is applied, thereby defining a precise folding zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If folding pressure is applied to tabs to enable correct folding, then tabs can be folded towards the central axis, but the folding pressure is transmitted to adjacent portions of the electrode sheet causing unintended folding
Solution Approach 1:
The electrode sheet is provided with a longitudinal track that locally reduces the thickness only in specific sections where tabs are located. This creates a difference in mechanical properties between the track section (thinner, more flexible) and the rest of the electrode sheet (full thickness, more rigid), allowing folding pressure to be localized to the tabs without transmitting to adjacent portions.
Solution Approach 2:
The electrode sheet is segmented into different thickness zones along the longitudinal track. The track creates discrete weakening sections that correspond to tab positions, effectively dividing the electrode sheet into independent folding zones that can be folded without affecting adjacent areas.
2Ease of manufacture
If tabs are folded without a predefined folding line, then the process is simpler, but it is not always possible to guarantee folding at the desired folding zone
Solution Approach 1:
The longitudinal track is created in advance during electrode sheet formation, pre-defining the folding zones before the winding and folding operations. This preliminary structural modification ensures that when folding pressure is later applied, the tabs will naturally fold along the predetermined track path, guaranteeing consistent folding zone location without requiring complex real-time control.
3Ease of operation
If the electrode sheet is structurally weakened along a longitudinal path, then tabs are more easily rotated and folded about that path, but the structural integrity of the electrode sheet is reduced
Solution Approach 1:
The thickness reduction is applied locally only along the longitudinal track where tabs are positioned, rather than uniformly across the entire electrode sheet. This localized modification provides the necessary flexibility for tab folding while preserving the full structural integrity and mechanical strength of the remaining electrode sheet areas that require strength for electrochemical performance.
Data Source
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AI summary
A method for forming an electrode for electrochemical cells comprises arranging an electrode sheet (11) having a thickness, a length (L) and a height (H), wherein the length (L) is measured along a longitudinal direction, the height (H) is measured along a transverse direction and the thickness is measured along a direction perpendicular to the longitudinal direction and the transverse direction, said electrode sheet (11) having a longitudinal free edge (12a); cutting a plurality of tabs (17) on the electrode sheet (11) in a first portion (15) of the electrode sheet extending transversely from the free edge (12a); reducing the thickness of the electrode sheet (11) along a longitudinal track (20) contained in the first portion (15) of the electrode sheet (11).