Plant and system for the automatic horizontal assembly of photovoltaic panels with front-back connection of the cells and pre-fixing

Abstract

Plant (10) and system for the automatic horizontal assembly of photovoltaic panels (30) with front-back-contact solar cells (300-1) of crystalline silicon, of the type called H-type, the contacting being carried out at a temperature lower than 150 DEG C also with the prefixing of conductive elements onto the encapsulating layer; the present invention solves the main problems of the conventional stringing systems and provides high production capacity with a precise positioning of the components. The plant (10) is made up of single workstations (100A-I) of the modular type which are arranged sequentially in a linear series, individually equipped according to the specific working process, being adjacent and laterally open to be crossed by the conveying line (110) of the trays (109) containing the panels being worked; after the automatic assembly in said plant (10), the panels are ready to be rolled in conventional furnaces.

Description

technical field [0001] The present invention relates to a device and a system for the automatic horizontal assembly of photovoltaic panels from H-type crystalline silicon solar cells, the connection of the front and back of the cells is realized at low temperature and pre-fixed; said device and system in particular Automatic type, with high throughput and high precision and high part positioning accuracy. [0002] The specific application of the present invention is in the industrial production of photovoltaic panels, especially the first generation panels composed of cells of monocrystalline silicon or polycrystalline silicon, the electrical contacts of opposite polarity are respectively positioned on the front and back of the cells (also can be called the front and back respectively), which is called H-type, and it can also be a modern development of this cell, for example, the type of cell is heterojunction, also known as HIT TM or hjt (English abbreviation). [0003] Sta...

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Problems solved by technology

[0036] A third problem encountered is the need to maintain a uniform temperature along the entire soldering surface of each interconnect ribbon in order to avoid varying and discontinuous contact resistances which can greatly affect the electrical performance of the entire panel

[0037] The fourth issue concerns the risk of cell rupture; the large amount of heat generated by contact needs to be transferred, and the funnel must perform pressure on the tape during heating, because of the inherent fragility of crystalline silicon solar cells, and because of the same Different shrinkage between two opposing faces where different amounts of metal are placed causes bending, which leads to a high probability of fracture in the cell itself

[0041] The above-mentioned problems of cell interconnection and assembly often give rise to defective panels with economical waste or rework as a result, in cases where defects are detected during production; defects related to the electrical contacts of cells are especially known to be Difficult to detect without going through the final lamination stage when the panel is compromised and non-recoverable

In addition, the stresses inside the cells caused by the conventional stringing procedure can sometimes lead to cracks in the cells themselves, which are detectable even long after panel handling installation

[0042] Furthermore, with regard to known solutions for back-contact panels, it was found that innovative integrated automatic assembly solutions have been proposed, but not yet available in the market, but are not suitable for traditional H-type cells, which must be placed in The front and back are soldered corresponding to the busbar

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