Electrode Assembly Tape Buffer for Crack-Prone Wound Batteries
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Solution Overview
Problem
Rechargeable batteries, particularly wound-type batteries, are prone to cracks due to the rigidity of the electrode tab and the expansion caused by charging and discharging, especially at positions with small curvature.
Innovation Solution
An electrode assembly design that includes a substrate with an electrode uncoated region and an electrode tab, where a tape is disposed between the uncoated region and the electrode tab, with specific dimensions and overlaps to reduce stress and prevent cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If an electrode tab is attached to the electrode substrate at a position with small curvature in a wound-type battery, then the battery structure is compact and efficient, but cracks occur around the electrode tab due to the rigidity of the tab and expansion during charge-discharge cycles
Solution Approach 1:
A buffer layer is disposed between the electrode tab and the electrode substrate at the attachment position. This buffer layer is prepared in advance to cushion and absorb the stress generated during battery expansion and contraction, preventing direct transmission of mechanical stress to the electrode tab and substrate interface, thereby preventing crack formation before they can occur
Solution Approach 2:
The buffer layer acts as an intermediary element between the rigid electrode tab and the flexible electrode substrate. It mediates the mechanical stress distribution by providing a compliant interface that accommodates the curvature and expansion differences, reducing the stress concentration that would otherwise lead to cracking at the attachment position
Data Source
AI summary
An electrode for a rechargeable battery is provided. The electrode includes a substrate having an electrode uncoated region and an electrode active region. An electrode tab is attached to the electrode uncoated region, and an active material layer is formed on the electrode active region. A tape is disposed between the electrode uncoated region and the electrode tab.