Electrode Lead Terminal Tape Layout for Shock-Resistant Cells
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Solution Overview
Problem
The challenge is to enhance the shock resistance of electrochemical devices with higher capacity while maintaining electrode strength, as thinner current collectors and separators make them prone to damage and short circuits from external impacts.
Innovation Solution
The solution involves using a protection tape with a substrate and adhesion layer to cover the lead terminal and a specific region of the current collecting foil, ensuring strong adhesion by pressing the tape onto the exposed surface, which improves the shock resistance without compromising capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the current collector and separator is decreased to achieve higher capacity, then the capacity increases, but the electrode strength decreases making them prone to damage and short circuits
Solution Approach 1:
The current collector surface is divided into a first region covered with mixture layer and a second region exposed without mixture layer. The protection tape is specifically applied to the second region and lead terminal connection area, segmenting the protection strategy to where it is most needed while maintaining overall electrode integrity.
Solution Approach 2:
A protection tape comprising a substrate layer and adhesion layer is attached beforehand to the lead terminal and exposed current collector region. This protective layer is positioned in advance to prevent external impacts from causing electrode damage or short circuits, cushioning against potential mechanical failures.
2Strength
If a protection tape is attached to the terminal connection portion to improve shock resistance, then the shock resistance improves, but the adhesion between the electrode and protection tape is insufficient
Solution Approach 1:
The protection tape is specifically applied to the second region of the current collector where the lead terminal is connected, and to at least a portion of a third region not covered by the lead terminal. This localized application ensures strong adhesion where mechanical stress is concentrated, rather than applying protection uniformly across the entire electrode surface.
Solution Approach 2:
The protection tape comprises a composite structure with a substrate layer and an adhesion layer. This multi-layer composite design provides both mechanical strength for shock resistance and sufficient adhesion to the current collector surface, solving the adhesion insufficiency problem.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively enhances the shock resistance of electrochemical devices by ensuring strong adhesion between the protection tape and the electrode, preventing fractures and maintaining high capacity even with thin current collectors and thick active material layers.
Implementation Method 1
The protection tape includes a substrate layer and an adhesion layer, the protection tape is adhered to the lead terminal provided at the second region of the current collecting foil
Data Source
AI summary
An electrochemical device includes a first electrode, a second electrode, a separator interposed between the first electrode and the second electrode, an electrolyte, a lead terminal electrically connected to one electrode of the first electrode and the second electrode, and a protection tape covering the lead terminal. The one electrode includes a current collecting foil and a mixture layer provided on the current collecting foil. The current collecting foil has a first region covered with the mixture layer, and a second region not covered with the mixture layer and exposing a surface of the current collecting foil. The protection tape is allowed to adhere to the lead terminal provided at the second region of the current collecting foil, and to at least a portion of a third region which is a part of the second region and not covered with the lead terminal.