Solar Module Laminated Back Sheet With Elastic Buffer Layer
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Solution Overview
Problem
Conventional solar power generation devices experience gaps and delamination between the fiber-containing sheet and the back sheet due to differing thermal expansion coefficients, leading to instability and reduced power generation efficiency, especially when flexible materials are used.
Innovation Solution
A laminated body comprising an installation surface, an elastic body, and a back sheet, where the elastic body is placed between the fiber-containing sheet and the back sheet, allowing for three-dimensional deformation to accommodate thermal expansion, thereby reducing shear stress and preventing gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If flexible resin materials are used for the back sheet to ensure flexibility and portability, then the solar power generation device becomes lighter and more portable, but thermal expansion/contraction causes greater deformation and delamination due to high linear expansion coefficient
Solution Approach 1:
An elastic body is introduced as an intermediary layer between the back sheet and the fiber-containing sheet. This elastic body has a linear expansion coefficient between those of the back sheet and the fiber-containing sheet, acting as a buffer that reduces thermal stress and prevents delamination while allowing the back sheet to maintain its flexibility
Solution Approach 2:
The linear expansion coefficient of the elastic body is specifically selected to be between the linear expansion coefficients of the back sheet and the fiber-containing sheet. This parameter optimization creates a gradient structure that gradually transitions thermal expansion properties, reducing stress concentration and preventing delamination
2Strength
If the solar power generation device is fixed to the fiber-containing sheet using adhesive, then the device is secured in place, but large shear stress from thermal expansion difference causes delamination and gap formation
Solution Approach 1:
The elastic body serves as a mediator between the back sheet and the fiber-containing sheet, reducing the thermal stress transmitted to the adhesive layer. This intermediary structure allows the adhesive to maintain strong fixation without experiencing damaging shear stress from thermal expansion differences
Solution Approach 2:
The elastic body provides beforehand cushioning by absorbing and distributing thermal stress before it reaches the adhesive layer. This pre-cushioning effect prevents the adhesive from failing due to thermal cycling, ensuring long-term stability of the fixation
3Strength
If fixing means such as piles are used to secure the device, then mechanical fixation is achieved, but wind enters gaps to cause vibration and damage to power generation cells and wiring
Solution Approach 1:
The elastic body acts as a sealing intermediary that fills and seals the gap between the back sheet and the fiber-containing sheet. This elastic sealing layer prevents wind from entering the gap and causing vibration, while still allowing the fixing means to provide mechanical fixation
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 laminated structure stabilizes the solar power generation device by minimizing gaps and delamination, ensuring long-term fixation and maintaining power generation efficiency.
Implementation Method 1
the elastic body having a longitudinal elastic modulus of 0.1 MPa or greater and 1000 MPa or less
Implementation Method 2
the back sheet and the installation surface have different linear expansion coefficients
Data Source
Figure 1~3
Figure 4
Figure 5(A)~5(C)
AI summary
Provided is a laminated body that includes an installation surface and a back sheet constituting a bottom section of a solar power generation device and in which a gap is unlikely to occur between the installation surface and the back sheet. A laminated body 1 of the present invention includes an installation surface 3, an elastic body 4, and a back sheet 6 constituting a bottom section of a solar power generation device 5. The elastic body 4 is fixed in a state placed on the installation surface 3. The back sheet 6 is fixed in a state placed on an upper surface of the elastic body 4.