Solar Cell Module Differential Polymer Embedding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Solar cell modules face instability issues due to high temperatures, temperature changes, and moisture penetration, leading to potential-induced degradation and affecting electrical output.
Innovation Solution
The use of a polyethylene-polypropylene copolymer as the first layer with a specific resistance greater than ethylene vinyl acetate as the second layer, resulting in reduced potential-induced degradation and improved stability against thermal cycling and moisture effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same polymer material is used for both front and rear embedding layers, then manufacturing simplicity is maintained, but potential-induced degradation occurs and electrical output deteriorates
Solution Approach 1:
The patent applies local quality by using different polymer materials for the front and rear embedding layers. The front layer uses a first polymer material with specific resistance ρ1, while the rear layer uses a second polymer material with specific resistance ρ2, where ρ1 > ρ2. This differentiation optimizes electrical performance locally at each interface with the solar cells, preventing potential-induced degradation while maintaining overall manufacturing feasibility.
Solution Approach 2:
The patent employs composite materials by combining two different polymer materials in a layered structure. Each polymer material contributes different electrical properties, creating a composite embedding system that leverages the advantages of both materials to improve electrical output stability and prevent degradation mechanisms.
2Strength
If high temperature lamination is applied to form cross-linked plastic layers, then adhesive properties improve, but thermal instability and potential-induced degradation increase
Solution Approach 1:
The patent applies parameter changes by carefully controlling the specific resistance values of the polymer materials and optimizing lamination temperature and pressure parameters. By selecting polymer materials with appropriate electrical resistance characteristics and adjusting processing parameters, the patent achieves strong adhesion while minimizing thermal degradation and potential-induced degradation effects.
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 configuration enhances the electrical output and stability of solar cell modules by minimizing potential-induced degradation and maintaining performance under high temperatures and moisture exposure.
Implementation Method 1
specific resistance ρ1 of the first material is greater than specific resistance ρ2 of the second material, wherein the specific resistance ρ1 of the first layer (2) is 5×10^16 to 8 x 10^6
Implementation Method 2
improved stability with respect to thermal cycling stresses
Implementation Method 3
The penetration of moisture should also not have a noticeable effect on the electrical output of the module
Data Source
Figure 1
AI summary
The module has a transparent front-side layer (2) i.e. film, extended along front sides of electrically interconnected solar cells (3). A front side of the front-side layer is laterally covered by a transparent front cover (1). A back-side layer (4) is extended along backsides of the solar cells. A back side of the back-side layer is covered by a back cover (5). The layers are made of different polymer materials. Specific resistance of the polymer material of the front-side layer is greater than that of the polymer material of the back-side layer.