Battery Packaging Adhesive Tape for Shift and Saltwater Resistance
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Solution Overview
Problem
Conventional pressure-sensitive adhesive tapes used for battery outer packaging face issues such as adhesive shift and liquid penetration during salt water immersion tests, which compromise their effectiveness in protecting batteries.
Innovation Solution
A pressure-sensitive adhesive tape with a specific composition and structural features, including a base material and a pressure-sensitive adhesive layer made from an acrylic polymer, is developed. The tape's loss modulus of elasticity and storage modulus of elasticity are optimized to prevent adhesive shift and liquid penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure-sensitive adhesive tape is used for battery outer packaging, then the tape can be applied to protect the battery surface, but the tape shifts in its pressure-sensitive adhesive surface after bonding
Solution Approach 1:
The patent modifies the chemical composition parameters of the pressure-sensitive adhesive layer by incorporating specific functional groups (carboxyl, hydroxyl, or amino groups) and controlling the polymer structure. This changes the adhesive's molecular properties to enhance bonding stability and prevent shifting after application.
Solution Approach 2:
The patent creates a composite pressure-sensitive adhesive system by combining acrylic polymer with specific functional group-containing additives or modifiers. This composite structure provides both the tackiness needed for application and the stability needed to prevent subsequent shifting.
2Reliability
If a conventional pressure-sensitive adhesive tape is used for battery outer packaging, then the tape can be applied to cover the battery, but liquid penetration is observed during salt water immersion test
Solution Approach 1:
The patent modifies the adhesive layer's chemical composition by incorporating functional groups that enhance water resistance and control the polymer's cross-linking density. This changes the material's permeability parameters to prevent salt water penetration while maintaining adhesive functionality.
Solution Approach 2:
The patent converts the potential harm of water exposure into a benefit by using hydrophobic functional groups and cross-linking structures that specifically repel water molecules. The adhesive layer transforms from being water-vulnerable to water-resistant through these chemical modifications.
3Strength
If the pressure-sensitive adhesive layer has high adhesion strength, then the tape bonds well to the battery surface, but the adhesive may become too rigid and shift under stress
Solution Approach 1:
The patent optimizes the molecular weight distribution and functional group density parameters of the adhesive polymer. This creates a balance where the adhesive has sufficient strength for bonding but maintains enough chain flexibility to accommodate stress without shifting.
Solution Approach 2:
The patent creates local variations in cross-linking density within the adhesive layer, with higher cross-linking at the substrate interface for strong bonding and lower cross-linking in the bulk for flexibility. This local quality differentiation resolves the strength-flexibility contradiction.
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 tape effectively prevents adhesive shift and liquid penetration, ensuring the integrity and protection of the battery during use and testing, thereby enhancing its reliability for battery outer packaging.
Implementation Method 1
a pressure-sensitive adhesive layer arranged on one side of the base material
Implementation Method 2
when the battery protected with the pressure-sensitive adhesive tape is subjected to a salt water immersion test, liquid penetration is observed
Data Source
Figure 1~3
AI summary
Provided is a pressure-sensitive adhesive tape for a battery outer packaging having the following feature: the shift (adhesive shift) of the tape in its pressure-sensitive adhesive surface and liquid penetration when the tape is subjected to a salt water immersion test are prevented, and hence the tape is useful for the outer packaging of a battery. The pressure-sensitive adhesive tape for a battery outer packaging includes: a base material; and a pressure-sensitive adhesive layer arranged on one surface of the base material, in which: a value calculated from an expression "a loss modulus of elasticity (G") of the pressure-sensitive adhesive tape for a battery outer packaging at 70°C×a thickness (mm) of the pressure-sensitive adhesive layer/a thickness (mm) of the pressure-sensitive adhesive tape for a battery outer packaging" is 8×103 Pa or more; a value calculated from an expression "a storage modulus of elasticity (G') of the pressure-sensitive adhesive tape for a battery outer packaging at 23°C×the thickness (mm) of the pressure-sensitive adhesive layer/the thickness (mm) of the pressure-sensitive adhesive tape for a battery outer packaging" is 3×105 Pa or less; and a pressure-sensitive adhesive strength of the pressure-sensitive adhesive tape for a battery outer packaging to a stainless-steel plate at 23°C is 2 N/10 mm or more.