Silk screen print positioning equipment and method for photovoltaic solar silicon chip

Abstract

The invention discloses silk screen print positioning equipment and a silk screen print positioning method for a photovoltaic solar silicon chip. The method comprises the following steps of: arranging an image pickup device at two opposite angle positions corresponding to a silicon chip and a silk screen respectively, and performing a predetermined step of the image pickup device; shooting opposite angle position images of the silicon chip and the silk screen by using the image pickup device; acquiring the shot position images, acquiring position characteristic parameters of the silicon chip and the silk screen, which comprise geometric centers and angles, correspondingly calculating a position deviation between the silicon chip and the silk screen, and introducing a compensation deviation according to a target position to acquire a comprehensive deviation; and adjusting the position and the angle of the silk screen relative to the silicon chip according to the calculated comprehensive deviation to finish a silk screen print positioning process of the photovoltaic solar silicon chip. According to the equipment and the method, the position deviation between the silk screen and the silicon chip can be measured by a simple and compact structure, and high accuracy of measurement and print positioning can be ensured; and simultaneously, the equipment and the method have the advantages that the equipment and the method are convenient to operate, high in interference resistance, stable and reliable.

Description

technical field [0001] The invention belongs to the field of solar cell manufacturing, and more specifically relates to a screen printing positioning device for photovoltaic solar silicon wafers and a corresponding positioning method. Background technique [0002] Photovoltaic solar wafers are the core part of the solar power generation system, and also the most valuable part of the solar power generation system. The role of photovoltaic solar silicon wafers is to convert solar energy into electrical energy, and the electrical energy is sent to storage for storage, or directly used to drive loads. The quality and cost of photovoltaic solar silicon wafers will directly determine the quality and cost of the entire solar power generation system. For the basic electrodes of photovoltaic solar silicon wafers, the most commonly used production process is the screen printing method. The working principle of screen printing is to use the mesh part of the screen pattern to penetrat...

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Problems solved by technology

However, this method still has the following defects: First, although visual detection of silicon wafer fragments can achieve a certain effect, in actual production, it is not easy to cause damage during the transmission of fragments, and more silicon wafers are damaged during the printing process. Due to the dark lines caused by the pressure of the scraper, the feasibility of visual detection of dark lines is very poor; secondly, the size of silicon wafers in the industry is generally 156*156mm, and it will also move towards the trend of large-size silicon wafers in the future. A set of vision systems captures the four edges of the entire silicon wafer. Under the same precision conditions, the larger the field of view, the higher the resolution of the camera required. In addition, the expansion of the field of view increases the height of the installed camera. Designs in other institutions also present challenges

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