Novel solar battery etched rolling wheel

Abstract

The invention discloses a novel solar battery etched rolling wheel. The novel solar battery etched rolling wheel comprises first rolling wheels and second rolling wheels; the spacing of the first rolling wheels is 50mm; the spacing of the second rolling wheels is 70mm; the first rolling wheels comprise first rolling wheel supporting points; the second rolling wheels comprise second rolling wheel supporting points; the first rolling wheel supporting points and the second rolling wheel supporting points are both 6mm in width before remolding, and the supporting points of the rolling wheels of different spacings are remolded separately; and the first rolling wheel supporting points and the second rolling wheel supporting points are changed to be 2mm in width through equal division, and the left sides, the middle or the right sides are reserved, so that rolling wheels of three different specifications are obtained. By virtue of the novel solar battery etched rolling wheel, the contact number of times and contact area between the same position of a silicon wafer and the rolling wheels are greatly lowered, and advantages of less overetching phenomenon, high battery piece production efficiency and the like are achieved, so that the novel solar battery etched rolling wheel can be widely popularized and used.

Description

technical field [0001] The invention belongs to the technical field of solar energy, and in particular relates to a novel roller for solar cell etching. Background technique [0002] At present, as the production technology of polysilicon solar cells becomes more and more mature, the industry has higher and higher requirements for the precision of equipment for producing solar cells. Nowadays, the etching of solar cells generally adopts chain wet etching, that is, when the silicon wafer is etched in the etching tank, the method of etching the lower surface and four sides of the silicon wafer is driven by a floating roller, and the silicon wafer will inevitably be in contact with the roller. , Too many times of contact, it is easy to cause the etchant to spread to the upper surface of the silicon wafer through the roller, corrode the diffused PN junction, cause over-etching, cause a decrease in efficiency, increase in EL black spots, and poor appearance, and reduce the effici...

AI Technical Summary

Problems solved by technology

Nowadays, the etching of solar cells generally adopts chain wet etching, that is, when the silicon wafer is etched in the etching tank, the floating roller is used to drive the silicon wafer to etch the lower surface and four sides, and the silicon wafer will inevitably contact the roller. , too many times of contact, it is easy to cause the etchant to spread to the upper surface of the silicon wafer through the roller, corrode the diffuse PN junction, cause over-etching, cause a decrease in efficiency, increase in EL black spots, and poor appearance, and reduce the efficiency and yield of finished cells

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