Solar Cell Module Transparent Resin Layer Melt Flow Rate
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Solution Overview
Problem
The existing manufacturing method for solar battery modules, which uses colored EVA film between the solar battery cell and protective elements, results in colored EVA flowing to the light-receiving side, blocking light and reducing the module's output due to inefficient light utilization.
Innovation Solution
A solar battery module design where a transparent resin layer with a lower melt flow rate is used between the solar battery cell and the colored resin layer, preventing the colored resin from flowing to the light-receiving side by using a laminate structure with a transparent substrate and back sheet, ensuring the colored resin remains on the backside, thus maintaining higher light transmission and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If colored EVA film is used between the solar battery cell and protective element to enhance light utilization efficiency, then photovoltaic conversion efficiency is improved, but colored EVA flows to the light-receiving side during manufacturing, blocking light and reducing output
Solution Approach 1:
The filler layer is divided into two separate layers: a colored resin layer (first resin layer) and a transparent resin layer (second resin layer). The colored resin layer is positioned between the solar battery cell and back sheet, while the transparent resin layer is positioned between the solar battery cell and transparent substrate. This segmentation prevents colored resin from flowing to the light-receiving side while maintaining light utilization efficiency through the colored layer's light scattering properties.
Solution Approach 2:
The transparent resin layer acts as an intermediary barrier between the colored resin layer and the light-receiving surface of the solar battery cell. This intermediate transparent layer prevents colored resin from migrating to the light-receiving side during the heating and pressing process, while still allowing light to pass through effectively to the solar battery cell.
2Loss of energy
If colored resin is used to improve photovoltaic conversion efficiency, then light utilization is enhanced, but light transmission to the light-receiving surface is blocked, reducing module output
Solution Approach 1:
The filler layer is segmented into a colored resin layer for light utilization and a transparent resin layer for light transmission. The colored resin layer (first resin layer) is positioned on the backside of the solar battery cell to scatter and reflect light back into the cell, enhancing light utilization efficiency. The transparent resin layer (second resin layer) is positioned on the light-receiving side to ensure unobstructed light transmission to the solar battery cell's light-receiving surface.
Solution Approach 2:
Different regions of the filler layer are assigned different optical properties: the colored resin layer has light-scattering properties to enhance light absorption by the solar battery cell, while the transparent resin layer has high light transmission properties to ensure sufficient light reaches the light-receiving surface. This local differentiation of material properties resolves the contradiction between light utilization and light transmission.
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 photoelectric conversion efficiency by preventing light obstruction, resulting in improved output and reduced resin flow to the light-receiving surface during the lamination process.
Implementation Method 1
a transparent resin layer having a lower melt flow rate than a colored resin layer
Data Source
Figure 1~2
Figure 3
AI summary
A solar battery module and manufacturing method for a solar battery module having improved output are provided. The solar battery module 1 is a transparent substrate 10, transparent resin layer 13b, solar battery cell 12, colored resin layer 13a and back sheet 11 laminated in this order. The light-receiving surface 12a of the solar battery cell 12 faces the transparent resin layer 13b side. The backside 12b of the solar battery cell faces the colored resin layer 13a. The MFR [melt flow rate] of the transparent resin layer 13b is lower than the MFR of the colored resin layer 13a.