Battery Packaging Material with Temperature-Dependent Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery packaging materials face challenges in maintaining productivity and cost-effectiveness while ensuring sufficient seal properties and preventing bursting due to internal pressure rises, as they often require complex manufacturing processes and additional components like perforating devices or safety valves.
Innovation Solution
A battery packaging material configuration featuring a stretched heat-resistant resin film layer laminated with a non-stretched thermoplastic resin film layer through specific adhesive layers, allowing for a dry lamination method with controlled adhesion strength and melting points, which generates a separation gap for gas discharge without the need for additional mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a perforating device with edge support and edge member is provided to prevent burst, then burst prevention capability is improved, but manufacturing process complexity increases and productivity decreases
Solution Approach 1:
The invention extracts and eliminates the complex perforating device (edge support, edge member) from the battery structure, replacing it with a simplified seal structure that achieves burst prevention through controlled adhesion strength and geometric design rather than additional mechanical components
Solution Approach 2:
The seal structure is designed to perform multiple functions simultaneously: sealing the battery case, enabling controlled burst at specific locations, and preventing electrolyte leakage, thereby eliminating the need for separate dedicated burst prevention components
2Reliability
If a safety valve mechanism is provided to discharge gas, then gas discharge capability is improved, but manufacturing process complexity increases and productivity decreases
Solution Approach 1:
The invention removes the separate safety valve mechanism from the battery structure, integrating gas discharge functionality directly into the seal structure through controlled adhesion characteristics and geometric configuration
Solution Approach 2:
The seal structure merges multiple functions including sealing, gas discharge, and burst prevention into a single integrated component, eliminating the need for separate safety valve mechanisms and reducing manufacturing complexity
3Reliability
If additional components like perforating devices or safety valves are provided, then safety functions are improved, but manufacturing cost increases
Solution Approach 1:
The invention extracts and eliminates additional safety components (perforating devices, safety valves) from the battery structure, achieving safety functions through the basic seal structure with optimized adhesion characteristics
Solution Approach 2:
The seal structure is designed to perform multiple safety functions (sealing, controlled burst, gas discharge, electrolyte containment) simultaneously, eliminating the need for multiple separate components and reducing overall manufacturing cost
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 configuration effectively prevents battery case bursting by allowing gas discharge through a penetration exhaust path and separation gap, while maintaining adhesion to seal the contents and reducing costs by eliminating the need for additional components, thus enhancing productivity and safety.
Implementation Method 1
the second adhesive layer is an adhesive layer which is formed by a dry lamination method and whose melting point is 60° C. to 100° C.
Implementation Method 2
the adhesion strength of the inner layer and the aluminum foil layer is 3.0 N/15 mm width or more at 80° C. and the adhesion strength of the inner layer and the aluminum foil layer is 2.0 N/15 mm width or less at 120° C.
Data Source
AI summary
A battery packaging material includes a stretched heat-resistant resin film layer as an outer layer which is laminated and integrated on one surface of an aluminum foil layer through a first adhesive layer; and a non-stretched thermoplastic resin film layer which is laminated and integrated as an inner layer on the other surface of the aluminum foil layer through a second adhesive layer, in which the second adhesive layer is an adhesive layer which is formed by a dry lamination method and whose melting point is 60° C. to 100° C., the adhesion strength of the inner layer and the aluminum foil layer is 3.0 N/15 mm width or more at 80° C., and the adhesion strength is 2.0 N/15 mm width or less at 120° C.