Solar Cell Module Reflective Filler Geometry
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Solution Overview
Problem
There is a need to enhance the output characteristics of solar cell modules by efficiently reflecting light onto the solar cells using a reflective filler member.
Innovation Solution
The solar cell module design includes a reflective filler member between solar cells and solar cell strings, with specific configurations such as varying distances and heights of the filler members to optimize light reflection and re-incidence, and the use of tab wiring members and interconnection wiring to enhance electrical connections and light collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reflective filler member is provided on the back surface sides of the solar cells, then light passing between the solar cells can be reflected toward the light receiving sides, but the output characteristics are not sufficiently improved
Solution Approach 1:
The patent applies local quality by creating different distances between the reflective filler member and the light receiving surface at different locations. Specifically, the distance is made shorter in regions where light reflection is most needed (near the edges between solar cells) and longer in other regions. This localized variation in distance optimizes the reflection path length and angle, enabling more reflected light to effectively reach adjacent solar cells and improve overall output characteristics.
Solution Approach 2:
The patent changes the geometric parameter of the reflective filler member by varying its distance from the light receiving surface. This parameter change allows optimization of the reflection angle and path length, ensuring that reflected light efficiently reaches the solar cells. By adjusting this distance parameter, the system maximizes light utilization and improves power generation efficiency.
2Loss of energy
If the reflective filler member is positioned closer to the solar cells, then light reflection efficiency improves, but the amount of re-incident light may be reduced due to insufficient reflection path
Solution Approach 1:
The patent implements local quality by establishing different distances between the reflective filler member and the light receiving surface at different locations. The distance is optimized locally to balance reflection efficiency and re-incidence amount, creating an optimal reflection path that maximizes both the intensity and quantity of reflected light reaching the solar cells.
Solution Approach 2:
The patent introduces a dimensional variation by creating a non-uniform distance profile in the vertical dimension between the reflective filler member and the solar cells. This dimensional change allows the system to optimize both reflection efficiency and light path length simultaneously, as different regions have different vertical distances tailored to their specific light reflection needs.
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 efficiently reflects light back onto the solar cells, improving the output characteristics by increasing the amount of re-incident light and carrier collection, thereby enhancing power generation efficiency.
Implementation Method 1
a reflective filler member on the back surface sides of the solar cells so that light being incident from the light receiving sides of the solar cells and passing between the solar cells can be reflected toward the light receiving sides and caused to be incident again on the solar cells
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The purpose of the present invention is to cause light reflected by a reflective member to efficiently enter solar cells to improve output characteristics. The present invention is provided with a plurality of solar cell strings (11-13), which are arranged in a horizontal direction. Each of the plurality of solar cell strings (11-13) is provided with: a plurality of solar cells (1) arranged in a vertical direction; and a wiring material which electrically connects at least some of the plurality of solar cells (1) to each other. The present invention is further provided with: transition wiring (21, 22) which electrically connects at least some of the plurality of solar cell strings (11-13) to each other; and a reflective filler member (6) provided to a rear-surface side of the plurality of solar cell strings (11-13). Each of the plurality of solar cells (1) is provided with busbar electrodes (3) extending in the vertical direction. The distance (D1) between the solar cells (1) in the solar cell strings (11-13) is greater than the distance (D2) between the solar cell strings (11-13).