Solar Cell Main Electrode Layout for Shading and Resistance Tradeoffs
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Solution Overview
Problem
Solar cells in existing technologies suffer from poor photoelectric conversion efficiency due to optical and electrical losses, including reflection, shadow loss, non-absorption, and increased transport and contact resistance, which are exacerbated by the limited current collection ability and risk of micro-cracking during welding and lamination.
Innovation Solution
The solar cell design includes main electrodes with varying connection wire widths and pitches, densely distributed connection wires, and chamfers to reduce shading and resistance, optimizing current conduction paths and minimizing micro-cracking risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the connection wire width is increased to improve current collection capability, then the current collection capability is improved, but the shadow loss increases
Solution Approach 1:
The connection wire width is designed to be locally variable: wider at the connection pads to enhance current collection capability, and narrower in the middle portion to reduce shadow loss. This local quality variation allows the same structure to satisfy different functional requirements at different locations.
2Reliability
If the connection wire width is increased to reduce contact resistance, then the contact resistance is reduced, but the shadow loss increases
Solution Approach 1:
The connection wire width is designed to be locally variable: wider at the connection pads to enhance current collection capability, and narrower in the middle portion to reduce shadow loss. This local quality variation allows the same structure to satisfy different functional requirements at different locations.
3Productivity
If the pitch between main electrodes is decreased to improve current collection, then the current collection capability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The main electrodes are segmented into different types (first main electrodes near first edges, second main electrodes near second edges, third main electrodes in between) with different pitch relationships. This segmentation allows optimization of current collection at different locations while maintaining manufacturability through standardized pitch values in different zones.
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 design enhances current collection capability, reduces optical and electrical losses, and minimizes micro-cracking, thereby improving the photoelectric conversion efficiency and output of the solar cell.
Implementation Method 1
a first connection wire electrically connected to the two first connection pads. The first connection wire has a first part between a respective first connection pad and a second edge adjacent to the respective first connection pad, and a second part between the two first connection pads
Implementation Method 2
Current generated by the solar cell is collected and output through secondary grid lines and main grid lines arranged in the solar cell
Data Source
Figure 1~2
Figure 3a~3b
Figure 4~5
AI summary
The disclosure relates to the photovoltaic field, and more specifically to a solar cell and a photovoltaic module. The solar cell includes a cell base and a plurality of main electrodes disposed on the cell base. The cell base has first edges and second edges, where the first edges include two opposite edges of the cell base along a second direction and the second edges include two opposite edges of the cell base along a first direction. The plurality of main electrodes extend in the second direction and are arranged at intervals in the first direction. The plurality of main electrodes include two first main electrodes, a respective first main electrode of the two first main electrodes is close to a corresponding first edge and includes two first connection pads respectively close to the second edges and a first connection wire electrically connected to the two first connection pads. The first connection wire has a first part between a respective first connection pad and a second edge adjacent to the respective first connection pad, and a second part between the two first connection pads. The first part has a first width, the second part has a second width, and the first width is greater than the second width. According to the solar cell, it is possible to at least improve the photoelectric conversion efficiency of the solar cell