Photovoltaic Cell Electrode Layout for Reliable Multi-Busbar Contact
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Solution Overview
Problem
The reduction in electrode pad area in multi-busbar technology for photovoltaic cells leads to unreliable connections with busbars and reduced current collection capability, making it difficult to simultaneously minimize unit consumption and ensure connection reliability.
Innovation Solution
A photovoltaic solar cell design featuring a silicon substrate with a passivation layer, an electrode, electrode pad, and extension line, where the extension line connects the busbar and electrode pad, directly contacting the substrate to enhance reliability and current collection, while using fire-through paste for printing the extension line to maintain contact with the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the electrode pad area is reduced in multi-busbar technology, then unit consumption is reduced, but connection reliability with busbar deteriorates
Solution Approach 1:
The electrode structure is segmented into three distinct components: the electrode pad, the extension line, and the busbar. This segmentation allows each component to be optimized independently - the electrode pad can be minimized for lower unit consumption, while the extension line provides a dedicated connection path to ensure reliability with the busbar.
Solution Approach 2:
The extension line acts as an intermediary element between the electrode pad and the busbar. It mediates the connection by providing a reliable conductive path that compensates for the reduced size of the electrode pad, ensuring stable electrical connection without requiring a large pad area.
2Loss of substance
If the electrode pad area is reduced, then unit consumption is reduced, but current collection capability deteriorates
Solution Approach 1:
The solution transitions from a two-dimensional electrode pad to a three-dimensional electrode structure by adding the extension line that extends vertically and horizontally. This dimensional extension allows current collection to occur along multiple paths and planes, compensating for the reduced pad area while maintaining collection capability.
Solution Approach 2:
The extension line serves multiple functions simultaneously: it provides electrical connection between the electrode pad and busbar, extends the current collection path to gather current from a larger area, and maintains structural integrity. This multi-functionality allows the system to achieve both reduced unit consumption and maintained current collection capability.
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 reduces unit consumption while ensuring reliable connections between the electrode pad and busbar, maintaining effective current collection even when the electrode is eroded by welding alloys, thus preventing grid breakage and enhancing overall performance.
Implementation Method 1
printing an extension line and a finger on the photovoltaic substrate by using a fire-through paste
Data Source
AI summary
Provided is a photovoltaic solar cell, a solar cell module and a manufacturing process. The photovoltaic solar cell includes a silicon substrate, and a passivation layer located on at least one surface of the silicon substrate. An electrode, an electrode pad and an extension line are printed on at least one surface of the silicon substrate. The electrode includes a busbar and a finger crossed with each other, and the finger is in contact with the silicon substrate. Two ends of the extension line are respectively connected to the busbar and the electrode pad, and the extension line is in contact with the silicon substrate.