Automated Tab Attachment for Solar Panel Inter-String Connections
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Solution Overview
Problem
Conventional solar panel manufacturing is time-consuming and error-prone due to manual processes, leading to high costs and reduced efficiency in mass-producing reliable solar panels, particularly in achieving efficient inter-string electrical connections.
Innovation Solution
An automated tabbing system that attaches conductive tabs to photovoltaic structures using a pick-and-place apparatus and cassette, enabling precise placement of tabs over busbars for single-sided inter-string electrical connections, reducing the need for cumbersome wirings and minimizing shading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual processes are used for tab attachment, then flexibility and adaptability are maintained, but manufacturing efficiency and precision are reduced
Solution Approach 1:
The patent replaces manual mechanical tab attachment processes with an automated pick-and-place system that uses vision guidance and automated positioning. The system incorporates a camera to locate busbars, a robotic mechanism to pick tabs from a reel, and an automated placement system to attach tabs to precise locations on solar cells, thereby eliminating manual labor while maintaining high precision through feedback control
Solution Approach 2:
The automated system performs self-positioning and self-alignment through vision guidance and automated feedback mechanisms. The system automatically locates busbars using camera imaging, calculates precise tab placement positions based on detected features, and adjusts its positioning without human intervention, enabling the system to service itself during the manufacturing process
2Manufacturing precision
If manual tab attachment is used, then device complexity is reduced, but manufacturing precision and connection reliability are worsened
Solution Approach 1:
The patent introduces a vision system as an intermediary between the automated placement mechanism and the solar cell substrate. The camera captures images of busbars, processes the visual information to determine precise locations, and guides the tab placement mechanism accordingly. This intermediary enables high precision without requiring complex mechanical positioning systems
Solution Approach 2:
Complex mechanical positioning systems are replaced with a vision-guided automated system that uses optical sensing and computational algorithms to achieve precise tab placement. The system substitutes mechanical complexity with sensor-based detection and software-controlled positioning, maintaining precision while reducing mechanical complexity
3Reliability
If conventional wiring methods are used for inter-string connections, then connection reliability is maintained, but shading losses and device complexity increase
Solution Approach 1:
The patent extracts and eliminates the conventional wiring elements from the inter-string connection system. Instead of using separate wires and connection hardware that create shading, the system directly attaches conductive tabs to busbars, creating a streamlined connection that removes unnecessary components and reduces shading losses while maintaining electrical connectivity
Solution Approach 2:
The patent merges the tab attachment function with the inter-string connection function. The same tab that provides electrical connection within a string also serves as the inter-string connector, eliminating the need for separate wiring systems. This consolidation reduces component count, minimizes shading, and simplifies the overall connection architecture
Data Source
AI summary
One embodiment of the present invention provides an apparatus for attaching conductive tabs to photovoltaic structures. The apparatus includes a cassette configured to store a plurality of conductive tabs and a pick-and-place apparatus configured to obtain a conductive tab from the cassette and place the conductive tab at an edge of a photovoltaic structure. The pick-and-place apparatus further includes a tab holder configured to pick up and release the conductive tab and a substantially horizontal track coupled to the tab holder. The tab holder is further configured to move back and forth along the track.