A device for preparing ultra-fine auxiliary gates by extrusion for crystalline silicon cells

Abstract

The invention discloses a crystalline silicon cell extrusion type ultrafine auxiliary grid preparation device. The objective of the invention is to solve the problems of difficulty in height-width ratio control, silver slurry waste and high scrap rate in screen printing. The crystalline silicon cell extrusion type ultrafine auxiliary grid preparation device comprises a vertically-arranged sprayer cylinder body, a sprayer mounted at the lower end of the sprayer cylinder body, and a sprayer end cover mounted at the upper end of the sprayer cylinder body; a piston is arranged inside the sprayer cylinder body; a piston rod fixed on the upper end of the piston penetrates the sprayer end cover; the piston is in interference fit with the sprayer cylinder body; a plurality of nozzles are formed in the sprayer; and the diameter of the spraying opening of each nozzle is in a range of 20 micron to 30 micron. With the crystalline silicon cell extrusion type ultrafine auxiliary grid preparation device of the invention adopted, n auxiliary grids can be prepared at a time, wherein the n=1, 2, 3..., and therefore, photoelectric conversion efficiency can be improved, and cost can be reduced, and problems existing in maintenance and scale production can be solved, and a foundation can be laid for full automation of solar cell sheet production lines. The crystalline silicon cell extrusion type ultrafine auxiliary grid preparation device can adapt to the development direction of thinning in the future.

Description

technical field [0001] The invention relates to the field of solar photovoltaic equipment, in particular to an extrusion-type preparation ultra-fine auxiliary grid device for crystal silicon cells, which is used for the preparation of ultra-fine auxiliary grid lines with different numbers of crystal silicon cells. Background technique [0002] In recent years, extrusion inkjet printing has been widely used in many fields such as injection molding. However, it is rarely used in the preparation of ultra-fine auxiliary grid lines for crystalline silicon cells. The methods used to prepare auxiliary grid lines include contact screen printing and Multi-array non-contact inkjet printing. Contact screen printing is limited by the particle size of the printing silver paste and the printing mesh, which makes it difficult to control the aspect ratio of the grid line, and causes waste of silver paste and a high fragmentation rate, which increases the production cost. Although multi-arr...

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Problems solved by technology

[0003] In order to solve the problems of difficult control of screen printing aspect ratio, waste of silver paste and high fragmentation rate, as well as problems such as complex control of multi-array non-contact inkjet printing, high production costs, and difficulties in online monitoring and maintenance, the present invention aims to To provide a device for preparing ultra-fine auxiliary grids by extruding crystalline silicon cells, the device can complete the preparation of n (where = 1, 2, 3...) auxiliary grid lines at one time, which improves the photoelectric conversion efficiency and reduces the It solves the problems of maintenance and large-scale production, adapts to the development direction of thin film in the future, and lays the foundation for the full automation of the solar cell production line.

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