Battery Packaging Adhesive Layer Rapid Curing
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Solution Overview
Problem
Conventional film-shaped battery packaging materials require long high-temperature curing times for adhesive layers, leading to increased lead times and product defects, while quick curing methods often compromise adhesion strength and moldability.
Innovation Solution
A battery packaging material with a laminate structure comprising a base material layer, an adhesive layer formed from a resin composition containing a thermosetting resin, a curing accelerator, and reactive resin beads, and optionally a light-absorbing and heat-generating substance, which allows for rapid curing without high-temperature aging, enhancing adhesion strength and moldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional two-pack type curable adhesive is used with dry lamination method, then adhesion between base material layer and barrier layer is achieved, but curing requires high-temperature aging for several days to several weeks, leading to increased lead time and product defects
Solution Approach 1:
The patent changes the chemical parameters of the adhesive system by switching from a conventional two-pack curable adhesive to a hot-melt adhesive with specific chemical composition (polyester resin, polyamide resin, and isocyanate compound in specific ratios). This parameter change enables the adhesive to cure rapidly at lower temperatures while maintaining strong adhesion, eliminating the need for long high-temperature aging processes.
Solution Approach 2:
The patent uses a composite adhesive formulation combining multiple resin types (polyester resin, polyamide resin) with isocyanate compound to create a multi-component hot-melt adhesive system. This composite material approach provides both rapid curing capability and strong adhesion strength, resolving the contradiction between curing speed and bond strength.
2Loss of time
If adhesive layer is quickly cured by increasing curing temperature, then curing time is reduced, but adhesion between base material layer and barrier layer is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive to include specific ratios of polyester resin (30-70 wt%), polyamide resin (10-40 wt%), and isocyanate compound (5-20 wt%). This compositional parameter change enables the adhesive to achieve full adhesion strength through rapid heating (e.g., 150-200°C for 10-30 seconds) without requiring prolonged high-temperature exposure, thus maintaining bond strength while reducing curing time.
3Loss of time
If adhesive component with large number of reactive groups is used to reduce curing time, then curing speed increases, but adhesive layer shrinks during curing or becomes hard and fragile, reducing moldability
Solution Approach 1:
The patent employs a composite adhesive system combining polyester resin and polyamide resin with isocyanate compound. The polyester and polyamide resins provide flexibility and moldability, while the isocyanate compound enables rapid crosslinking. This composite formulation achieves rapid curing without excessive shrinkage or brittleness, maintaining the adhesive layer's flexibility for battery packaging applications.
Solution Approach 2:
The patent carefully controls the molecular weight, functional group content, and ratio of each adhesive component to optimize the balance between curing speed and flexibility. By adjusting these chemical parameters, the adhesive cures rapidly while maintaining adequate elongation and flexibility required for battery pack molding processes.
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 reduces lead times, prevents product defects, and achieves high adhesion strength and moldability by quickly curing the adhesive layer, even under deep drawing conditions, while maintaining excellent adhesion properties.
Implementation Method 1
the adhesive layer is a cured product of a resin composition containing a thermosetting resin
Implementation Method 2
a curing accelerator
Implementation Method 3
a light-absorbing and heat-generating substance
Data Source
Figure 1
AI summary
[Problem] The purpose of the present invention is to provide a film-like packaging material for batteries, which is capable of providing excellent adhesion strength by curing an adhesive layer in a short time, said adhesive layer being arranged between a base layer and a barrier layer, and which has excellent formability. [Solution] A packaging material for batteries, which is formed of a laminate that sequentially comprises a base layer, an adhesive layer, a barrier layer and a sealant layer in this order. By having the adhesive layer formed of a cured product of a resin composition that contains a thermosetting resin and (A) a curing accelerator and an elastomer resin or (B) reactive resin beads, the adhesive layer arranged between the base layer and the barrier layer can be cured in a short time, thereby reducing the lead time. In addition, by providing the adhesive layer between the base layer and the barrier layer, the adhesion strength between the base layer and the barrier layer is increased and excellent formability can be achieved.