Solar Cell Module Adhesive Bonding for High-Temperature Stability
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Solution Overview
Problem
Existing solar cell modules face challenges in securely fixing the solar cell panel to the frame member, particularly under high-temperature conditions, where adhesives with short curing times may not provide sufficient long-term adhesion and stability, affecting the module's durability and productivity.
Innovation Solution
A combination of a pressure-sensitive first adhesive and a curable second adhesive is used, with the second adhesive positioned differently along the frame member to enhance bonding strength and stability, allowing for initial fixation with the first adhesive before curing of the second adhesive, which provides long-term adhesion even under high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a hot melt sealing agent with short curing time is used as adhesive, then productivity is improved due to faster curing, but adhesion strength under high-temperature conditions deteriorates
Solution Approach 1:
The adhesive system is segmented into two distinct components: a first adhesive applied at the front surface side for immediate bonding and positioning, and a second adhesive applied at the back surface side for strong temperature-resistant bonding. This segmentation allows each adhesive to be optimized for its specific function, resolving the contradiction between fast curing and high-temperature adhesion.
Solution Approach 2:
Different adhesive properties are applied to different locations of the frame member. The front surface side receives an adhesive optimized for rapid initial bonding, while the back surface side receives an adhesive optimized for high-temperature resistance. This local differentiation of adhesive quality enables both fast productivity and reliable high-temperature adhesion.
2Device complexity
If a single adhesive is used for bonding the solar cell panel to the frame member, then device complexity is reduced, but bonding strength and stability under varying conditions deteriorate
Solution Approach 1:
The adhesive system uses a composite approach by combining two different adhesive materials with complementary properties. The first adhesive provides rapid initial bonding characteristics, while the second adhesive provides enhanced temperature resistance and long-term stability. This composite adhesive system achieves superior overall performance compared to either adhesive alone.
Solution Approach 2:
Two adhesive systems with different functional characteristics are merged into a single integrated bonding solution. The first adhesive and second adhesive work together in the same assembly process, with the first adhesive providing immediate fixation and the second adhesive providing reinforced temperature-resistant bonding, achieving both speed and strength.
3Ease of manufacture
If adhesive is applied uniformly along the entire frame member, then manufacturing simplicity is maintained, but position displacement control under high temperature deteriorates
Solution Approach 1:
The adhesive application process is segmented into two distinct application zones along the frame member: a first adhesive application region at the front surface side and a second adhesive application region at the back surface side. This segmentation enables precise control of position displacement by placing adhesives at strategically different locations, while maintaining relatively simple manufacturing 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
This solution ensures stable and secure attachment of the solar cell panel to the frame member, maintaining adhesive strength and reducing position displacement, thereby improving the module's reliability and productivity by allowing for easier handling and curing processes.
Implementation Method 1
The adhesive includes a pressure-sensitive first adhesive and a curable second adhesive
Implementation Method 2
a curable second adhesive... which provides long-term adhesion even under high temperatures
Data Source
AI summary
A solar cell module includes a solar cell panel, a frame member, and an adhesive. The solar cell panel has a front surface, a back surface and a lateral surface. The frame member is located along an outer peripheral part of the solar cell panel, and includes a fitting section with the outer peripheral part fitted therein. The adhesive is located in a space in the fitting section, and bonded to the outer peripheral part. The adhesive includes a pressure-sensitive first adhesive and a curable second adhesive. The curable second adhesive exists at a position different from a position at which the first adhesive exists, in a direction along the longitudinal direction of the frame member.