Folded Electrode Assembly With Broken Seams to Cut Stacking Waste
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Solution Overview
Problem
The high manufacturing cost in battery production is primarily due to material waste in the stacking process of stacked electrode assemblies, where the first electrode sheet is broken before reaching the required number of layers, leading to scrapping of completed parts.
Innovation Solution
An electrode assembly design featuring a first electrode sheet with a broken seam in the width direction, allowing it to be folded into bending and stacking segments, combined with second electrode sheets of opposite polarity, to meet layer requirements while reducing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the first electrode sheet is broken before reaching the required number of layers in the stacking process, then the manufacturing process continues, but the completed stacked part must be scrapped due to insufficient layers
Solution Approach 1:
The first electrode sheet is segmented into multiple stacking segments by intentional broken seams. This allows the sheet to be folded into a stacked configuration where multiple segments contribute to the final layer count, enabling the assembly to reach the required number of layers even when the original sheet is broken
Solution Approach 2:
The electrode sheet is folded such that stacking segments are nested within each other in a compact arrangement. The broken segments are positioned and folded to interlock with adjacent segments, allowing efficient space utilization and achieving the required layer count without wasting the broken sheet
2Loss of substance
If the first electrode sheet is made continuous to avoid breaking, then material utilization improves, but the flexibility and adaptability in stacking configuration are reduced
Solution Approach 1:
Broken seams are intentionally created at predetermined locations on the first electrode sheet before the stacking process. This preliminary action allows the sheet to be easily folded and configured into the required stacked structure, providing both material utilization and stacking flexibility
Solution Approach 2:
The electrode sheet design incorporates predetermined broken seams that enable dynamic folding and configuration adjustments during the stacking process, allowing the same sheet to be adapted to different stacking requirements while maximizing material utilization
Data Source
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AI summary
The present application relates to the technical field of battery fabrication, and provides an electrode assembly, a battery cell, a battery, and an electrical device. The electrode assembly comprises: a first pole piece, comprising a plurality of bent sections and a plurality of stacked sections that are stacked, each bent section being used to connect two adjacent stacked sections, and the first pole piece having a first broken seam, the first broken seam extending along the width direction of the first pole piece so as to break the first pole piece; and a plurality of second pole pieces, the polarity of which is opposite to that of the first pole piece, and which is provided in a stacking direction of the plurality of stacked sections, each second pole piece being disposed between two adjacent stacked sections. The electrode assembly has low fabrication costs.