Crosslinked Fluororesin Resin Layer for Battery Sealing
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Solution Overview
Problem
Lithium-ion secondary batteries face challenges with resin layers that lack sufficient thermal bonding properties, chemical resistance, heat resistance, and flame retardancy, leading to potential electrolyte leakage and safety issues, especially with increasing demands for higher currents and voltages in applications like electric vehicles.
Innovation Solution
The use of a crosslinked fluororesin resin layer stacked on a metal base material, with ionizing radiation applied to form chemical bonds and enhance adhesiveness, providing improved heat resistance, flame retardancy, and thermal bonding properties without the need for roughening treatments or additional adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyolefin resin layer is used for electrical insulation and sealing, then the housing and tab lead can be sealed, but the resin layer has poor adhesiveness to metal base material
Solution Approach 1:
The patent introduces an acid-modified polyolefin layer as an intermediary between the metal base material and the polyolefin resin layer. This intermediate layer serves as a bridge that provides both adhesion to the metal surface and compatibility with the polyolefin sealing layer, thereby resolving the adhesion problem while maintaining sealing performance.
Solution Approach 2:
The patent creates a composite structure consisting of multiple layers: metal base material, acid-modified polyolefin layer, and polyolefin resin layer. This composite material approach combines the advantages of each layer - the metal provides structural strength, the acid-modified polyolefin provides adhesion, and the polyolefin resin provides sealing and electrical insulation.
2Ease of manufacture
If conventional resin layers are used, then manufacturing is simple, but the resin layers lack sufficient thermal bonding properties, chemical resistance, heat resistance, and flame retardancy
Solution Approach 1:
The patent employs a multi-layer composite structure where each layer contributes specific properties: the acid-modified polyolefin layer provides thermal bonding capability and adhesion, while the polyolefin resin layer provides chemical resistance, heat resistance, and flame retardancy. This composite approach achieves high reliability without complicating the manufacturing process.
Solution Approach 2:
The patent modifies the chemical structure of the polyolefin by introducing acid modification, which fundamentally changes the material's properties to include both adhesion to metal and thermal bonding capability. This parameter change allows the resin layer to meet multiple performance requirements simultaneously.
3Reliability
If resin layers with sufficient heat resistance and flame retardancy are used, then safety in harsh environments is improved, but thermal bonding properties may be insufficient
Solution Approach 1:
The patent divides the resin system into two distinct functional layers: the acid-modified polyolefin layer dedicated to thermal bonding and adhesion, and the polyolefin resin layer dedicated to heat resistance, flame retardancy, and chemical resistance. This segmentation allows each layer to optimize its specific function without compromise.
Solution Approach 2:
The patent applies different material properties to different locations in the structure: the acid-modified polyolefin layer provides localized adhesion and thermal bonding at the metal interface, while the polyolefin resin layer provides localized heat resistance and flame retardancy at the outer surface and sealing regions.
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 results in an electricity storage device member with enhanced heat resistance, flame retardancy, and adhesiveness, mitigating liquid leakage and ensuring safety in harsh environments, suitable for high-temperature applications such as electric vehicles, while also improving productivity in manufacturing.
Implementation Method 1
applying ionizing radiation to the layer containing the fluororesin
Implementation Method 2
the resin layer contains a crosslinked fluororesin
Data Source
AI summary
An electricity storage device member is provided. The electricity storage device member includes a base material mainly composed of a metal and a resin layer stacked on the base material, in which the resin layer contains a crosslinked fluororesin.