Bridged Solar Cell Bus Bar Orientation Reduces Ribbon Length
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Solution Overview
Problem
Conventional solar power generation systems face increased power loss and material costs due to the need for long cables and extensive bussing ribbons in series connections, which also occupy significant space on the glass substrate of solar cell modules.
Innovation Solution
The bridged solar cell design features bus bar electrodes disposed at different angles on the front and back surfaces, allowing direct electrical connection between solar cell strings without external bussing ribbons, reducing the area and length of bussing ribbons needed, and utilizing welding members and junction boxes for series connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If solar cells are arranged in a single row and connected in series, then electrical connection to the inverter is achieved, but power loss and material costs increase due to long cables
Solution Approach 1:
The patent transitions from a single-row linear arrangement to a multi-row two-dimensional layout. Multiple rows of solar cells can be connected in parallel within a solar cell module, and modules are then connected in series, reducing the need for long cables to connect distant cells to the inverter.
Solution Approach 2:
The patent divides the solar cell array into multiple modules, where each module contains multiple rows of solar cells. This segmentation allows for shorter cable runs within each module and reduces overall cable length and power loss in the system.
2Ease of manufacture
If four bussing ribbons and three bussing ribbons are disposed at upper and lower edge regions, then external electrical connection is achieved, but material costs and area usage increase
Solution Approach 1:
The patent extracts and eliminates the need for separate bussing ribbons at the upper and lower edges by incorporating bus bar electrodes directly into the solar cell structure itself. The bus bar electrodes are formed as integral parts of the solar cell, removing the requirement for additional external bussing ribbons.
3Ease of manufacture
If junction box is located at the center of the solar cell module, then electrical connection is achieved, but total cable length increases significantly
Solution Approach 1:
The patent moves the junction box from a central location to a peripheral location at the edge of the solar cell module. This repositioning allows for shorter cable runs from the solar cells to the junction box, reducing total cable length and associated power losses.
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 minimizes energy loss and material costs by reducing the area of the glass substrate and the length of bussing ribbons, enhancing the efficiency and cost-effectiveness of solar power generation systems.
Implementation Method 1
The P-type semiconductor layer and the N-type semiconductor layer are alternately arranged in the bridged solar cell... solar cells can directly convert solar energy into electricity
Implementation Method 2
The bus bar electrodes on the back surface of the bridged solar cell can be directly extended onto a front surface of another bridged solar cell... to electrically connect two solar cell strings
Data Source
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AI summary
A bridged solar cell and a solar power generation system. The bridged solar cell (100) comprises a substrate (100a), a first group of bus electrodes (100b), a second group of bus electrodes (100c), a first welding piece (100d), a first insulating piece (100e), a third group of bus electrodes (100g) and a second welding piece (100f). The first group of bus electrodes is arranged on a front surface (100a1) of the substrate along a first direction (D1). The second group of bus electrodes is arranged on a back surface (100a2) of the substrate along a second direction (D2) different from the first direction (D1), and is electrically connected to the first group of bus electrodes through the substrate. The first welding piece is electrically connected to the second group of bus electrodes. The first insulating piece is arranged on the back surface. The third group of bus electrodes is arranged on the first insulating piece along the second direction so as to be insulated from the substrate. The second welding piece is arranged on the first insulating piece and is electrically connected to the third group of bus electrodes.