Electrochemical Cell Packaging Material with Epoxy Resin Protective Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrochemical cell packaging materials suffer from corrosion and defects in appearance due to adhesion of electrolyte liquids, particularly with oriented nylon films, leading to whitening and cracks during the filling process.
Innovation Solution
An electrochemical cell packaging material is designed with a structure that includes a base material layer, a protective layer formed of epoxy resin with bisphenol A or bisphenol F skeletal units, and a barrier layer made of metal foil, bonded together with an adhesive containing a pigment, which enhances resistance to electrolyte liquids and prevents defects such as whitening and cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an oriented nylon film is used as the base material layer to achieve excellent formability, then the packaging material can be formed into thin, sharp shapes, but the oriented nylon film is corroded (whitened) by electrolyte liquid, leading to appearance defects
Solution Approach 1:
The patent uses a composite structure with multiple layers: an oriented nylon film base material layer for formability, a corrosion-resistant resin layer (polyester, polyamide, or polyolefin) to protect against electrolyte liquid, and a heat-sealable resin layer. This composite approach allows the packaging to maintain both excellent formability from the nylon layer and corrosion resistance from the protective resin layer.
Solution Approach 2:
The corrosion-resistant resin layer acts as an intermediary between the oriented nylon film base material layer and the electrolyte liquid. It prevents direct contact between the electrolyte and the nylon film, thereby protecting the base material from corrosion while allowing the formability characteristics of the nylon to be retained.
2Volume of moving object
If the packaging material is formed into thin, sharp shapes to accommodate narrow spaces, then electronic devices can be made more compact, but the material becomes more susceptible to corrosion and appearance defects
Solution Approach 1:
By using a multi-layer composite structure, the patent achieves both thin profile and corrosion resistance. The oriented nylon film provides formability for thin shapes, while the corrosion-resistant resin layer protects against electrolyte even when the overall packaging is thin. The layers work together to maintain protection without increasing overall thickness.
Solution Approach 2:
The corrosion-resistant resin layer is applied specifically where needed - as a protective coating on the base material layer that will contact the electrolyte liquid. This localized protection allows the rest of the structure to remain thin while providing targeted resistance to corrosion at the critical interface with the electrolyte.
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 corrosion and defects in appearance by providing excellent resistance to electrolyte liquids, maintaining the integrity and appearance of the packaging material during the filling process and press-forming of electrochemical cells.
Implementation Method 1
the protective layer formed of an epoxy resin having bisphenol A or bisphenol F as skeletal units is excellent in resistance to electrolyte liquid
Implementation Method 2
heat-sealing them together around the periphery produces a packaging member for an electrochemical cell
Data Source
AI summary
Provided is an electrochemical cell packaging material with excellent electrolyte resistance. An electrochemical cell packaging material includes the following in a laminated structure: a substrate layer that, at a minimum, includes resin film; a protective layer that is arranged as the outermost layer and protects the substrate layer; a thermal adhesion layer that is arranged as the innermost layer and which includes thermal adhesion resin; and a barrier layer that includes metal foil and is arranged between the substrate layer and the thermal adhesion layer. The protective layer is formed of an epoxy resin that has bisphenol A or bisphenol F as an element in the backbone.