Thermally Conductive Epoxy Composition Balancing Adhesion and Elongation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional epoxy resin-based thermally conductive resin compositions for lithium-ion batteries lack improved elongation while maintaining adequate adhesion to resin materials like PET, leading to deformation and reworkability issues.
Innovation Solution
A thermally conductive resin composition comprising an epoxy resin, an amine curing agent with three or more active hydrogen atoms of amino groups, and a specific equivalent ratio of active hydrogen atoms to epoxy groups, along with a thermally conductive filler, is developed to enhance elongation and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional epoxy resin-based thermally conductive resin compositions are used, then adhesion to resin materials like PET is maintained, but elongation is insufficient leading to deformation and reworkability issues
Solution Approach 1:
The patent applies parameter changes by optimizing the equivalent ratio of active hydrogen atoms to epoxy groups within a specific range (1.05-2.70), and by controlling the molecular weight of the amine curing agent (3000 or less). These parameter adjustments resolve the contradiction by achieving both adequate adhesion and improved elongation, enabling reworkability without deformation.
2Strength
If urethane-based resin compositions are used, then adhesion is excessive, but deformation occurs during rework due to insufficient strength of cooling plates
Solution Approach 1:
The patent resolves this contradiction by changing the resin system from urethane-based to epoxy-based, and by controlling the equivalent ratio of active hydrogen to epoxy groups within a specific range. This achieves balanced adhesion that is sufficient for bonding but not excessive to cause deformation during rework, thereby improving reliability.
3Strength
If the equivalent ratio of active hydrogen atoms to epoxy groups is increased, then adhesion is improved, but elongation deteriorates
Solution Approach 1:
The patent applies parameter changes by defining an optimal equivalent ratio range (1.05-2.70) of active hydrogen atoms to epoxy groups. Within this range, the resin composition achieves both improved adhesion and maintained elongation, resolving the contradiction between these two properties.
4Strength
If the molecular weight of the amine curing agent is increased, then adhesion is improved, but viscosity increases making application difficult
Solution Approach 1:
The patent applies parameter changes by limiting the molecular weight of the amine curing agent to 3000 or less. This parameter control achieves adequate adhesion while maintaining low viscosity for easy application, resolving the contradiction between adhesion strength and ease of manufacture.
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 composition achieves improved elongation and maintains adhesion to resin materials like PET, preventing deformation and enabling reworkability.
Implementation Method 1
an amine curing agent having three or more active hydrogen atoms of amino group
Implementation Method 2
thermally conductive filler
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A thermally conductive resin composition comprising an epoxy resin, an amine curing agent having three or more active hydrogen atoms of an amino group, and a thermally conductive filler, and having an equivalent ratio of the active hydrogen atoms of the amino group to an epoxy group of more than 1 and less than 2.7.