A kind of double printing equipment, printing process and battery of crystalline silicon solar cell

Abstract

The invention discloses crystalline silicon solar cell double-time printing equipment, printing technique adopting same and a crystalline silicon solar cell prepared by adopting the printing technique, and belongs to the technical field of solar cells. The equipment comprises a back electrode screen printer, a drying furnace I, a back electric field screen printer, a drying furnace II, a positive electrode screen printer, a drying furnace III and a positive electrode ink-jet printer which are sequentially connected with one another, wherein the positive electrode ink-jet printer consists of a host machine, a sprayer which is connected with the host machine, and a driving device; the main machine is used for setting positive electrode patterns and controlling a printing instruction; the sprayer is used for spraying metal slurry on the solar cell according to the positive electrode patterns set in the host machine; the driving device is responsible for the transmission route of the solar cell. According to the solar cell which is manufactured by the printing technique disclosed by the invention, composite secondary grid lines are higher in height and narrower in width; the narrow and high secondary grid lines are capable of greatly increasing current density of the solar cell and reducing the series resistance, so the conversion efficiency of the cell can be greatly improved.

Description

technical field [0001] The invention relates to a printing device, in particular to a double-printing device for a crystalline silicon solar cell, a printing process and a battery thereof, and belongs to the technical field of solar cells. Background technique [0002] The electrode of crystalline silicon solar energy is composed of front electrode and back electrode, the back electrode is composed of Al back field and Ag back electrode, and the front electrode is composed of Ag positive electrode. The Ag positive electrode is composed of Ag main grid lines and Ag thin grid lines. Generally, there are 3-6 Ag main grid lines and they are parallel and evenly distributed, with a width of 0.8-1.5mm. The Ag thin grid lines are 80-120 and parallel and evenly distributed. The width is 45-65 μm; the Ag main grid lines and the Ag thin grid lines are vertical. The Ag positive electrode has a great influence on the conversion efficiency of the battery, so researchers pay more and more...

AI Technical Summary

Problems solved by technology

[0003] Due to the two-time printing technology, all screen printing equipment is used, and the metal paste printed by screen printing has the ability to expand and expand, so that the reduction of the width of Ag fine grid lines has encountered a bottleneck.

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