A double-sided crystalline silicon solar cell printing system

Abstract

The invention discloses a double-surface crystalline silicon solar cell printing system which comprises a printing platform, a drying area for drying electrode slurry, at least two printing areas which are arranged on the printing platform and are arranged at periphery of the drying area, and a clamping conveying device which is used for clamping two ends of a silicon chip and conveys the silicon chip between the drying area and the printing areas. Each printing area is provided with a silk screen printer for printing the electrode slurry, wherein one printing area is internally provided with an overturning device for overturning the silicon chip. When the silicon chip after drying requires back-side printing, the clamping conveying device conveys the silicon chip after drying to the overturning device. The overturning device overturns the silicon chip and conveys the silicon chip to a silk screen printer in the same printing area for performing electrode printing. The printing system according to the invention ensures no wearing of the electrode on the other side in printing the electrode at one side of the double-surface solar cell, and furthermore effectively improves machining quality of the double-surface solar cell.

Description

technical field [0001] The invention relates to the technical field of solar cell processing equipment, in particular to a double-sided crystalline silicon solar cell printing system. Background technique [0002] In the photovoltaic solar energy industry, the manufacture of solar cells must go through processes such as texturing, diffusion, etching, coating, screen printing, and sintering. Among them, the purpose of the screen printing process is to print electrode paste on the front and back of the solar cell, and then through the sintering process, the paste printed on the cell is solidified into the electrode of the cell. [0003] The printing steps of solar cells in the prior art are generally back silver printing, drying, aluminum back field printing, drying and positive electrode printing, and each step is transported by a belt. Since conventional solar cells are single-sided solar cells, The front electrode printing is placed in the last printing process to avoid da...

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Problems solved by technology

[0004] However, for double-sided crystalline silicon solar cells, both the front and back sides must absorb sunlight. In order to achieve back light absorption, it is necessary to arrange multiple parallel aluminum grid lines on the back of the solar cell to replace all aluminum in the existing single-sided solar cells. Therefore, during the screen printing process of double-sided crystalline silicon solar cells, the electrode morphology on both sides of the cell needs to be protected. If the printing steps and supporting printing equipment of the prior art are used, the positive electrode grid line , the back of the solar cell is directly in contact with the belt. During the belt transmission process, the back silver main grid and aluminum grid wires on the back will inevitably have friction with the belt. If serious, the back silver main grid and aluminum grid wires will be broken and damaged. The back silver main grid and the aluminum grid line will inevitably reduce the photoelectric conversion efficiency; in addition, when the belt is used for conveying, multiple printing machines and dryers are generally arranged in sequence along a straight line. At this time, the space required for the equipment is relatively large. For markets with high site costs, large sites will inevitably bring high processing costs and are not easy for operators to operate

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