Patterned Non-Coating Portion for Lithium Ion Battery Electrode Ductility
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Solution Overview
Problem
Lithium ion battery electrodes experience waviness and breakage due to differences in ductility between coated and non-coated portions during rolling, leading to manufacturing defects.
Innovation Solution
An electrode with a patterned non-coating portion, such as concave grooves, dots, or strips, is manufactured to match the ductility of the coating portion, using a roller with a pressing part to ensure even rolling pressure, reducing the ductility difference and preventing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an active material coating portion is rolled, then the electrode is manufactured, but waviness occurs due to difference in ductility between coating portion and non-coating portion
Solution Approach 1:
The patent applies local quality by forming a pattern (concave grooves, dots, or strips) on the non-coating portion of the electrode. This pattern creates localized structural variations that modify the ductility characteristics of the non-coating portion to match the coating portion, thereby preventing waviness during rolling while maintaining overall manufacturing efficiency
Solution Approach 2:
The non-coating portion is segmented into patterned regions (concave grooves, dots, or strips) that create distinct structural zones. This segmentation allows different parts of the non-coating portion to have varied mechanical properties, enabling better matching with the coating portion's ductility during the rolling process
2Productivity
If the electrode is rolled, then the electrode is manufactured, but wrinkle or folding occurs due to difference in tension between coating portion and non-coating portion
Solution Approach 1:
The pattern formed on the non-coating portion creates local structural variations that adjust tension distribution. The concave grooves, dots, or strips provide localized compliance that matches the tension characteristics of the coating portion, preventing wrinkle or folding during rolling while maintaining electrode integrity
Solution Approach 2:
The pattern on the non-coating portion acts as a preemptive cushioning structure that compensates for tension differences before rolling occurs. The patterned features absorb or distribute tensile stresses that would otherwise cause wrinkles or folds, protecting the electrode structure during the manufacturing process
Data Source
AI summary
The present invention relates to an electrode, for reducing a difference in ductility between a non-coating portion and a coating portion of the electrode, a method for manufacturing the electrode, and a roller for manufacturing the electrode. Also, the electrode according to the present invention includes an electrode foil, a coating portion coated with an electrode active material on one surface of the electrode foil, and a non-coating portion which is disposed adjacent to the coating portion on the one surface of the electrode foil, and is not coated with the electrode active material and on which a pattern is disposed.