90° Peel Test Fixture for Pouch Tab Sealing Strength
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Solution Overview
Problem
Pouch-type secondary batteries experience weak sealing strength at the junction between the pouch casing and electrode tabs due to heterogeneous bonding, leading to potential peeling off when internal pressure increases, necessitating a reliable method for measuring adhesive sealing strength.
Innovation Solution
A 900 peel test apparatus is designed with a fixed plate, a moving plate, and a load applier to quantify sealing strength by peeling the pouch casing from the electrode tab while maintaining a 90° peeling angle, using a load measuring device and clamps to secure and measure the bonding material's adhesive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If heterogeneous bonding is used to join pouch casing and electrode tabs, then manufacturing flexibility is improved, but sealing strength deteriorates
Solution Approach 1:
The patent applies different bonding methods to different regions of the pouch casing. Thermal fusion is used for homogeneous aluminum laminate regions, while adhesive bonding is used for heterogeneous regions joining aluminum laminate to electrode tabs. This localized application of different bonding qualities resolves the contradiction by optimizing each region's bonding method to its specific material composition.
2Volume of moving object
If pouch casing expands under internal pressure, then battery volume increases, but bonding reliability deteriorates due to peeling
Solution Approach 1:
The patent employs adhesive bonding as a cushioning layer between the aluminum laminate pouch casing and electrode tabs. This adhesive layer anticipates and absorbs the stress generated during pouch expansion, preventing direct stress concentration at the bonding interface. The adhesive acts as a buffer that maintains bonding reliability even when the pouch expands under internal pressure.
3Measurement precision
If 90° peel test is performed to measure sealing strength, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent designs the test apparatus with a movable plate that maintains a constant 90° peeling angle throughout the test. The plate's geometry and movement mechanism ensure that the peeling force is always applied perpendicular to the bonding interface, creating equipotential measurement conditions. This eliminates angle variation errors and achieves high measurement precision without requiring complex angular control systems.
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 apparatus effectively measures and enhances the reliability of sealing strength at a 90° peeling angle, simulating the expansion scenario of pouch-type secondary batteries, providing a simple and precise method for assessing bonding reliability.
Implementation Method 1
a measurement object formed by bonding first and second specimens is mounted on the moving plate
Data Source
AI summary
Proposed is an apparatus for measuring sealing strength. The apparatus includes a fixed plate, a moving plate on which a measurement object formed by bonding first and second specimens is mounted, and movably disposed on the fixed plate, and a load applier measuring a load applied to the first specimen to peel off the first specimen from the second specimen. The first specimen is peeled off from the second specimen while maintaining a predetermined peeling angle.