Photovoltaic Cell Interconnection with Closed-Contour Conductive Patterns
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Solution Overview
Problem
Interconnected shingle photovoltaic chains face challenges in reducing the coverage zone between adjacent cells while maintaining good electrical and mechanical reliability, leading to unused surface area and potential mechanical stress issues.
Innovation Solution
The solution involves designing photovoltaic cells with an interconnection conductive track featuring spaced-apart closed-contour conductive patterns that accommodate electrically conductive adhesive for bonding adjacent cells, allowing for reduced coverage zones and improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large coverage zone is used between adjacent photovoltaic cells, then electrical and mechanical reliability is improved, but unused surface area increases
Solution Approach 1:
The interconnection conductive track is segmented into multiple spaced-apart closed-contour conductive patterns instead of being continuous. Each closed-contour pattern serves as an independent bonding zone, allowing the adhesive to be distributed at specific locations rather than requiring continuous coverage. This segmentation enables reduction of the overall coverage zone while maintaining reliable electrical and mechanical connections through multiple discrete bonding points.
2Area of stationary object
If the coverage zone between adjacent photovoltaic cells is reduced, then unused surface area decreases, but electrical and mechanical reliability may deteriorate
Solution Approach 1:
The closed-contour conductive patterns create localized zones of enhanced adhesion and electrical connectivity. By concentrating the conductive material and adhesive bonding in specific closed-contour regions, the interconnection achieves high reliability at these critical locations without requiring extensive coverage across the entire cell surface. This local quality approach ensures that bonding occurs precisely where needed for electrical connection and mechanical strength.
3Reliability
If conventional welding or bonding tapes are used to interconnect photovoltaic cells, then electrical connection is achieved, but separation distance increases reducing active surface area
Solution Approach 1:
The invention merges the electrical interconnection function with the mechanical bonding function into a single integrated closed-contour conductive pattern structure. The conductive adhesive serves dual purposes: providing electrical connectivity between cells and creating mechanical bonding through the same material and structure. This eliminates the need for separate bonding tapes or wires, allowing cells to be placed closer together without compromising electrical connection, thereby increasing active surface area.
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 approach reduces the coverage zone between photovoltaic cells, minimizing unused surface area and enhancing mechanical reliability by improving the adhesion between cells, thus maintaining good electrical and mechanical performance.
Implementation Method 1
The closed contours allow the adhesive to be retained and located when the adjacent photovoltaic cell is pressed, during assembly of the photovoltaic chain, against the first face of the photovoltaic cell
Data Source
AI summary
A photovoltaic cell includes an edge; an interconnection conductive track extending parallel to the edge to within 1.3 mm; and a plurality of electrodes, called “collection fingers”, extending parallel to each other and electrically connected to the interconnection track; the interconnection conductive track including a plurality of spaced-apart closed-contour conductive patterns, each closed-contour conductive pattern including a closed contour surrounding a portion of the first face.