Electrode Assembly Protection Tape for Rechargeable Battery
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Solution Overview
Problem
Rechargeable batteries face issues with active material separation and short circuits due to the tab attached to the current collector, leading to damage and reduced charge and discharge efficiency.
Innovation Solution
An electrode assembly with a protection tape system that covers the positive and negative electrode tabs and uncoated regions, using a first cover to cover the side end of the coating portion and a second cover that extends to cover both the tab and uncoated region, preventing active material separation and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tab is attached to the current collector for electrical connection, then the battery can be charged and discharged, but the active material may separate and short circuits may occur
Solution Approach 1:
A protection tape is introduced as an intermediary component between the tab and the active material layer. This tape covers the uncoated region of the current collector where the tab is attached, preventing direct contact between the tab and active material, thus avoiding short circuits while maintaining electrical connection functionality
Solution Approach 2:
The protection tape is applied in advance to the uncoated region of the current collector before the tab is attached. This preliminary protective measure prevents active material separation and short circuit formation before they can occur during battery operation
2Reliability
If multiple protection components are used to prevent active material separation and short circuits, then reliability improves, but device complexity increases
Solution Approach 1:
The protection function is merged into a single integrated protection tape that combines multiple protective features: it covers the uncoated region, prevents active material separation, and avoids short circuits. This single component replaces what would otherwise require multiple separate protection elements
Solution Approach 2:
The protection tape serves multiple functions simultaneously: it acts as a barrier to prevent active material from reaching the tab, provides mechanical support to the uncoated region, and maintains the structural integrity of the electrode assembly. This multi-functionality reduces the need for additional specialized components
Data Source
AI summary
An electrode assembly and a rechargeable battery that can prevent an active material from separating and prevent a short circuit and damage due to a tab that is attached to a current collector are provided. The electrode assembly includes a positive electrode, a negative electrode, and a separator that is disposed between the positive electrode and the negative electrode. The positive electrode has a positive electrode coating portion in which a positive electrode active material layer is formed and a positive electrode uncoated region in which a positive electrode active material layer is not formed, and a positive electrode tab is attached to the positive electrode uncoated region. A first positive electrode protection tape is attached to the positive electrode uncoated region, and the first positive electrode protection tape includes a first cover that covers the side end of the positive electrode coating portion and a second cover that is extended from the first cover and that covers both the positive electrode tab and the positive electrode uncoated region.