Electrode Tab Weakening Marks to Block Particle Entry
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Solution Overview
Problem
Foreign particles fall into the interior of a roll-like electrode assembly during or after winding, leading to a decrease in yield.
Innovation Solution
The electrode assembly includes weakening marks on the tabs of electrode plates, allowing the first connecting portions to be bent at a preset angle greater than 0°, effectively blocking external particles from entering the gap between adjacent electrode plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode plates are wound into a roll-like structure, then the electrode assembly can be compactly formed, but foreign particles can fall into the interior through gaps between adjacent circles, decreasing yield
Solution Approach 1:
The patent applies preliminary action by pre-forming weakening marks on the tabs before winding, which enables the tabs to be bent at predetermined angles during winding. This pre-prepared structural feature allows the tabs to automatically block gaps between adjacent electrode plate circles, preventing foreign particles from entering the interior of the rolled electrode assembly.
Solution Approach 2:
The patent applies segmentation by dividing each tab into multiple portions (first connecting portion, second connecting portion, and third connecting portion) with weakening marks between them. This segmentation allows different portions to perform different functions: the first connecting portion connects to the current collector, while the second and third portions form blocking structures that prevent particle entry through the gaps between adjacent circles.
2Object-affected harmful factors
If tabs are bent at an angle to block particle entry, then foreign particles are prevented from entering, but the structural integrity of the tab may be compromised
Solution Approach 1:
The patent applies local quality by creating weakening marks only in specific locations on the tab (between the first connecting portion and second connecting portion, and between the second and third connecting portions) rather than throughout the entire tab. This localized weakening allows bending and blocking functionality at specific points while maintaining the structural integrity and strength of the remaining tab portions, particularly the first connecting portion that connects to the current collector.
Solution Approach 2:
The weakening marks are pre-formed on the tabs before winding, creating predetermined bending zones. This preliminary action ensures that when the tabs are bent during winding, they bend cleanly at the intended locations without compromising overall structural integrity, as the material has been pre-prepared to bend at those specific points.
Data Source
AI summary
An electrode assembly includes separators and electrode plates, and each electrode plate includes an active material portion and a tab. The tabs include weakening marks, first connecting portions, and second connecting portions; and the weakening marks are connected between the first connecting portions and the second connecting portions. The weakening marks are configured to guide the first connecting portions to be bent, so that the first connecting portions and a winding axis (L) are arranged at a preset angle (α).