Segmented Bus Bar Solar Cell Reducing Shading Loss
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Solution Overview
Problem
Conventional solar cell panels face issues with shading loss and reduced reliability due to wide ribbons used for connecting solar cells, which also lead to inferior attachment strength and potential damage, limiting the enhancement of output power and long-term reliability.
Innovation Solution
A solar cell panel design featuring a semiconductor substrate with conductive regions and electrodes, including finger lines and bus bar lines, where leads with a smaller width are used to connect solar cells, reducing shading loss and improving attachment strength and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wide ribbons are used to connect solar cells, then attachment strength is improved, but shading loss increases and output power decreases
Solution Approach 1:
The bus bar line is divided into multiple electrode portions with openings, creating a segmented structure that reduces the continuous width of conductive material. This segmentation allows light to pass through the openings while maintaining electrical connectivity, thereby reducing shading loss while preserving attachment strength through the distributed electrode portions.
Solution Approach 2:
The bus bar line incorporates openings (voids) within its structure, creating a porous configuration. This porous design reduces the effective width of the bus bar that blocks light, minimizing shading loss while the surrounding electrode portions maintain sufficient attachment strength to the finger lines and leads.
2Reliability
If wide ribbons are used to connect solar cells, then electrical connection is improved, but reliability decreases due to detachment and damage
Solution Approach 1:
The bus bar line is segmented into multiple electrode portions connected by conductive paths with openings between them. This segmentation distributes mechanical stress and reduces the risk of complete connection failure, improving reliability. The openings reduce material usage and flexibility, preventing damage from excessive rigidity.
Solution Approach 2:
The design changes the geometric parameters of the bus bar line by introducing openings and reducing overall width. This parameter change maintains electrical connectivity while improving flexibility and reducing mechanical stress concentration, thereby preventing detachment and damage to enhance connection reliability.
3Loss of energy
If narrow leads are used to reduce shading loss, then output power is improved, but attachment strength may be insufficient
Solution Approach 1:
The bus bar line features localized electrode portions with concentrated conductive material at critical connection points (where leads attach), while having openings in between. This local quality enhancement ensures strong attachment strength at connection points while maintaining narrow overall width to reduce shading loss across the solar cell surface.
Solution Approach 2:
The electrode structure combines conductive material with non-conductive spaces (openings) to create a composite configuration. This allows the design to achieve both strong electrical connection and attachment strength where needed, while minimizing light blocking in other areas, effectively balancing attachment strength and shading loss reduction.
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 enhances the output power and reliability of solar cell panels by minimizing shading loss and increasing attachment force, while reducing material costs and preventing damage from wide ribbons.
Implementation Method 1
a solar cell is highlighted as a next-generation cell capable of converting solar energy into electric energy
Data Source
AI summary
A solar cell panel is disclosed. The disclosed solar cell panel includes a semiconductor substrate, a conductive region disposed in or on the semiconductor substrate, an electrode connected to the conductive region, a lead electrically connected to the electrode. The electrode includes finger lines, and a bus bar line extending across the finger lines, and electrically connected to the lead. First and second end edge areas are arranged at opposite ends of the bus bar line disposed adjacent to opposite edges of the semiconductor substrate, respectively. The bus bar line includes electrode portions respectively disposed at the first end second end edge areas. Each electrode portion includes an opening formed through the each electrode portion, and an outermost end disposed at a position flush with corresponding ones of the outermost ones of the finger lines or a position outwards of the corresponding outermost finger lines.