Symmetric Solar Cell Sheet Layout for Rotation-Free Half-Cell Assembly
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Solution Overview
Problem
The complex process and cumbersome steps in assembling photovoltaic assemblies using interdigitated back contact solar cells result in low production efficiency due to the need to rotate and align half cells during welding.
Innovation Solution
A solar cell sheet design with symmetrically arranged positive and negative electrodes on a semiconductor substrate, allowing for direct connection of slices after cutting along the central line without rotation or alignment, simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding strips are used to connect two adjacent half cells, then the positive main gate electrodes and negative main gate electrodes can be connected, but the process becomes complex and cumbersome due to the need to rotate one half cell 180 degrees and align the electrodes
Solution Approach 1:
The patent applies asymmetry by designing the solar cell structure with asymmetric electrode arrangement relative to the cutting line. Specifically, the first sub-cell has positive main gate electrodes extending in one direction while the second sub-cell has negative main gate electrodes extending in the same direction, eliminating the need for 180-degree rotation. This asymmetric design simplifies the assembly process while maintaining reliable electrical connections through welding strips.
2Reliability
If the entire back surface includes parallel positive and negative main gate electrodes, then the interdigitated back contact structure can be formed, but the assembly process requires rotation and alignment steps that reduce production efficiency
Solution Approach 1:
The patent applies preliminary action by pre-configuring the electrode arrangements in the first and second sub-cells during the manufacturing process. The positive main gate electrodes in the first sub-cell and the negative main gate electrodes in the second sub-cell are positioned to extend in the same direction before assembly. This preliminary configuration eliminates the need for rotation and alignment operations during assembly, thereby improving production efficiency while ensuring reliable electrode connections.
3Reliability
If one half cell is rotated 180 degrees during assembly, then the extension directions of positive and negative main gate electrodes can coincide for proper welding strip connection, but the process becomes more time-consuming and complex
Solution Approach 1:
The patent applies inversion by reversing the conventional approach. Instead of rotating one half cell to achieve electrode alignment, the invention designs the sub-cells so that the electrodes are already oriented in the same direction after cutting. The first sub-cell retains its original orientation with positive electrodes, while the second sub-cell is configured with negative electrodes extending in the same direction, eliminating the need for rotation and reducing assembly time.
Data Source
AI summary
A solar cell sheet includes: a semiconductor substrate, and a positive electrode and a negative electrode that are arranged on a shadow surface of the semiconductor substrate; the semiconductor substrate comprises a first substrate portion and a second substrate portion that are symmetrically arranged along a central line of the semiconductor substrate. In the present disclosure, the solar cell sheet is cut along the central line to obtain two slices. As the two slices respectively correspond to the first substrate portion and the second substrate portion, the extension directions of the first positive electrode portion and the second negative electrode portion coincide and can be connected to both ends of the conductive wire, respectively. The extension directions of the first negative electrode portion and the second positive electrode portion coincide, which can be connected to the both ends of another conductive wire, respectively.