Battery Packaging Adhesive Resolving Weight and Adhesion Contradiction
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Solution Overview
Problem
Existing battery packaging materials face challenges in maintaining adhesion strength and preventing appearance defects, especially under high temperature and high humidity conditions, and in forming complex shapes with reduced weight and thickness.
Innovation Solution
A battery packaging material adhesive comprising a polyol composition and a polyisocyanate composition, where the polyol composition includes a polyester polyol made from a polybasic acid or its derivative, with the polybasic acid being aromatic-ring-containing, and having a number-average molecular weight between 3000 and 100000, ensuring high formability and wet-heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a film-shaped multilayered body is used as battery packaging material to reduce weight and thickness, then weight and thickness are reduced, but adhesion strength between layers deteriorates under high temperature and high humidity conditions
Solution Approach 1:
The patent changes the chemical parameters of the adhesive layer by specifying a polyester polyol with number-average molecular weight of 3000-100000 made from aromatic-ring-containing polybasic acid, and controlling the NCO/OH equivalent ratio to 10-30. These parameter changes enable the adhesive to maintain strong bonding between the outer-layer-side substrate layer and metal layer even after long-term exposure to high temperature and high humidity, thus resolving the contradiction between weight reduction and adhesion strength maintenance.
2Shape
If the packaging material is formed into complex shapes with convex and concave surfaces, then shape versatility is improved, but appearance defects such as lifting between layers occur
Solution Approach 1:
The patent optimizes the adhesive composition parameters, specifically using a polyester polyol with number-average molecular weight of 3000-100000 and controlling the equivalent ratio of isocyanate groups to hydroxyl groups to be 10-30. This parameter optimization provides high formability during forming processes while preventing appearance defects such as lifting between layers, thus resolving the contradiction between shape versatility and appearance quality.
3Reliability
If thermal fusion is performed on the sealant layer to seal battery elements, then sealing function is achieved, but adhesion strength between layers decreases
Solution Approach 1:
The patent specifies a polyester polyol with number-average molecular weight of 3000-100000 made from aromatic-ring-containing polybasic acid and controls the NCO/OH equivalent ratio to 10-30. These parameter changes create an adhesive layer that maintains stable adhesion strength even after thermal fusion processing of the sealant layer, thus resolving the contradiction between achieving sealing function and maintaining adhesion strength.
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 provides a battery packaging material with sustained adhesion strength and resistance to thermal fusion, maintaining integrity even after long-term durability tests under high temperature and high humidity, and enabling the formation of complex shapes with reduced weight and thickness.
Implementation Method 1
A battery packaging material adhesive including a polyol composition (A) and a polyisocyanate composition (B)... sustained adhesion strength and resistance to thermal fusion
Implementation Method 2
a polyester polyol made from a polybasic acid or its derivative... number-average molecular weight between 3000 and 100000
Implementation Method 3
a polyester polyol made from a polybasic acid or its derivative, with the polybasic acid being aromatic-ring-containing
Data Source
AI summary
The invention provides a packaging material that has high formability and that does not undergo a decrease in the adhesion strength between layers and appearance defects such as lifting between layers even after thermal fusion between portions of the sealant layer performed for sealing battery elements and furthermore after a long-term durability test under high temperature and high humidity. The adhesive for the packaging material including, as essential components, a polyol composition (A) and a polyisocyanate composition (B), wherein the polyol composition (A) includes a polyester polyol made from, as essential materials, a polybasic acid or its derivative and a polyhydric alcohol, the polybasic acid or its derivative material is all an aromatic-ring-containing polybasic acid or its derivative, and the polyester polyol has a number-average molecular weight in a range of 3000 to 100000; a battery packaging material, a battery container, and a battery that use the adhesive.