Hollow Packaging for Cable-Type Battery with Corrugated Metal Foil
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Solution Overview
Problem
Cable-type secondary batteries face contamination of the electrolyte due to water or air permeation through polymer packaging, leading to performance degradation, and the metal foil packaging is prone to tearing when bent, limiting flexibility.
Innovation Solution
A hollow packaging with a corrugated metal foil layer, a polymer resin layer, and a mechanical support layer, where the polymer resin layer faces inward, providing a flexible and waterproof structure that prevents electrolyte contamination and maintains mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a general tube packaging of polymer material is used, then flexibility is improved, but water or air may permeate through the micropores causing electrolyte contamination
Solution Approach 1:
The packaging uses a composite structure consisting of a metal foil layer (for impermeability) and a polymer resin layer (for flexibility). The metal foil layer prevents water and air permeation, while the polymer resin layer provides flexibility and protects the metal layer from external damage, resolving the contradiction between flexibility and contamination prevention.
2Reliability
If a packaging formed of metal foil layer is used, then waterproof property is improved, but the metal foil layer tears when bent due to stiff property
Solution Approach 1:
The packaging combines a metal foil layer with a polymer resin layer. The metal foil layer provides waterproof properties, while the polymer resin layer provides flexibility and absorbs bending stresses, preventing the metal foil from tearing when the battery is bent.
Solution Approach 2:
The polymer resin layer acts as a flexible shell that surrounds and protects the rigid metal foil layer. This flexible outer layer allows the packaging to bend without causing the metal foil to tear, while the metal foil maintains the waterproof barrier.
3Ease of operation
If a corrugated metal foil layer is used, then mechanical flexibility is improved, but manufacturing complexity increases
Solution Approach 1:
The metal foil layer is formed with a corrugated (wavy) structure instead of being flat. This curvature in the metal foil layer allows it to flex and bend more easily, improving mechanical flexibility while maintaining the waterproof properties of the metal material.
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
The solution effectively prevents electrolyte contamination and enhances mechanical flexibility, ensuring battery performance and structural integrity even when the battery is bent.
Implementation Method 1
a sheet-type metal foil layer having a pattern with a corrugated structure formed on a surface thereof
Implementation Method 2
When a general tube packaging of a polymer material is used, water or air may permeate through the micropores of the polymer and contaminate an electrolyte in a battery
Data Source
AI summary
The present invention relates to a hollow packaging for a cable-type secondary battery and a cable-type secondary battery comprising same, and more specifically, to a hollow packaging for a cable-type secondary battery and a cable-type secondary battery comprising same, wherein the hollow packaging for a cable-type secondary battery comprises a packaging sheet including a sheet-type thin metal layer provided with a corrugated pattern on the surface, a first polymer resin layer formed on one surface of the thin metal layer, and a mechanical support layer formed on the other surface of the thin metal layer, wherein the packaging sheet forms a hollow space by bending so that the first polymer resin layer faces inward.