Solar Cell Electrode Pad Segmentation for Ribbon Adhesion
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Solution Overview
Problem
Existing solar cell panels face challenges with light loss and reduced electrical characteristics due to wide ribbons used for connecting solar cells, and narrower wiring members improve adhesive properties but increase material usage and recombination issues.
Innovation Solution
A solar cell panel design featuring a wiring member with a small width and rounded shape, including a first electrode with different pad portions to optimize adhesive properties and reduce material usage, light loss, and recombination by varying the area and length of pad portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a ribbon with a large width is used to connect solar cells, then the adhesive properties are improved, but light loss increases and the number of ribbons must be decreased
Solution Approach 1:
The electrode is divided into multiple pad portions (first pad portion, second pad portion, third pad portion) along the width direction. Each pad portion has a different width, creating a segmented structure that allows different sections to serve different functions: narrower sections reduce light loss while wider sections provide sufficient adhesive area for wiring member connection.
2Loss of energy
If the number of ribbons is decreased to reduce light loss, then light loss is reduced, but electrical characteristics are reduced due to increased carrier moving distance
Solution Approach 1:
Different pad portions are designed with different widths to optimize local functions. The first pad portion has a narrower width to minimize light loss, while the second and third pad portions have wider widths to provide sufficient adhesive area. This local quality variation allows the electrode to simultaneously reduce light loss and maintain electrical characteristics.
3Productivity
If a wiring member with a small width is used to increase the number of wiring members, then the number of wiring members is increased and carrier moving distance is reduced, but adhesive properties are reduced
Solution Approach 1:
The electrode is segmented into multiple pad portions with different widths. This segmentation allows narrow wiring members to be used (increasing their number and reducing carrier moving distance) while the wider second and third pad portions provide sufficient adhesive area to compensate for the reduced width of individual wiring members.
4Strength
If the width of electrodes is entirely increased to improve adhesive properties of the wiring member, then adhesive properties are improved, but the amount of electrode material increases and light loss increases
Solution Approach 1:
Instead of uniformly increasing the width of the entire electrode, the invention applies local quality variation by creating pad portions with different widths. The second and third pad portions have wider widths to provide sufficient adhesive area, while the first pad portion and other sections maintain narrower widths to minimize material usage and light loss.
5Strength
If the area of the electrode is increased to improve adhesive properties, then adhesive properties are improved, but recombination at the electrode increases and open-circuit voltage is reduced
Solution Approach 1:
The electrode structure uses local quality variation with different pad portions having different widths. This allows the second and third pad portions to have sufficient area for good adhesive properties, while the first pad portion and other sections have reduced area to minimize recombination and maintain open-circuit voltage.
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 design effectively reduces material usage, light loss, and recombination while improving adhesive properties, enhancing the efficiency and output of the solar cell panel.
Implementation Method 1
A plurality of solar cells is connected in series or in parallel by a ribbon and is manufactured in the form of a solar cell panel
Data Source
Figure 1
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AI summary
A solar cell panel includes a plurality of solar cells including first and second solar cells, and a plurality of wiring members electrically connecting the first and second solar cells. A first electrode of each of the first and second solar cells includes a first bus bar including a plurality of first pad portions. The plurality of first pad portions include a first end pad positioned on one end side of the first bus bar and on which an end of the wiring member is positioned, and a first extension pad positioned on the other end side of the first bus bar and on an extension of the wiring member. An area of the first end pad is different from an area of the first extension pad.