With the increase of labor costs, at the same time, in order to ensure the absolute quality of products, avoid product quality problems caused by many human factors, such as secondary pollution and sorting fragments. It is the future development trend of photovoltaic manufacturing technology to use machine vision inspection technology to replace manual labor to objectively and reliably monitor and sort the quality defects of silicon wafers and cells.

Wuxi Chuangshi New Technology Co., Ltd., an earlier machine vision company in China, has been committed to developing, producing and selling machine vision solutions. With its pioneering achievements and continuous investment in R&D, MVC today has mature visual inspection technology, and its business involves photovoltaic, thin film, steel, automobile, electronics and other industries.

In the photovoltaic industry, Chuangshi New Technology Co., Ltd. has made great efforts to develop several sets of machine vision inspection systems, which have been applied in the domestic photovoltaic industry. Many famous solar cell and module manufacturers use MVC vision inspection systems for Wafer, solar cell and module inspection.

In the solar panel manufacturing process, from the front end to the back end, any error in any link will affect the power generation efficiency of the finished solar panel. At present, most solar manufacturers in China rely on artificial vision to judge product quality, which brings many inspection problems. Compared with artificial vision, machine vision detection has the following advantages: automation of the detection process, high precision, high reliability, and high detection efficiency.

The MVC series visual inspection system developed by Chuangshi New Technology is used for the quality inspection of silicon wafers, cells and modules. Based on the company's years of experience in the field of visual inspection, the system has developed a series of customized products for the special needs of the photovoltaic field. , which can provide specific solutions for complex and special inspection tasks. The system reliably identifies micro-cracks, impurities, voids, edge and corner breaks as well as grid line breaks, paste stains and color deviations. It can quickly identify product quality defects in the production process, ensuring continuous high-quality products. The intelligent and reliable sorting software can accurately classify the cells according to the printing quality: A or B grade or defective, and can also sort the cells according to the color.

Silicon wafer crack detection system

The MVC Wafer Crack Inspection System uses infrared to inspect raw wafers for micro-cracks or other quality problems. The system includes a specially configured line scan camera with 4096 (4k) pixels. Thanks to the use of a dedicated near-infrared (NIR) LED illuminator, specially configured and highly sensitive line scan cameras, and sophisticated analysis and classification of defects, the system can reliably inspect wafers for 3600 wafers/h of work Microcracks.

Cell front and back defect detection and color sorting

Cell Defect and Color Sorter A refurbished version of the vision system with color line scan camera specifically designed for high performance cell sorting. It combines high-resolution, flawless color imaging with print performance inspection as an alternative to having two camera inspection stations. This version is integrated in the battery tester and only takes up one camera mount. It includes the following components: 4x line 4096 (4k) pixel line scan cameras (red, green, blue and grayscale (black and white)); focused white LED lighting module and backside illumination.

This state-of-the-art custom 4-line color scanning camera accurately analyzes print quality and shape in the micrometer range, as well as color features and color defects/deviations. 3 of the 4 linear photosensitive units are equipped with color filters to facilitate the acquisition of 3×16 megapixel color frame images. The fourth photosensitive unit (black and white) is specially adapted to the high contrast ratio of silver paste printing. This outstanding performance enables very powerful color sorting and detection of surface defects as well as very sensitive measurement of screen-printed deviations and broken bars.

It has been proved by practice that the use of MVC visual inspection system can fully automate quality inspection and sorting, effectively guarantee the quality of photovoltaic products (reliability rate > 99.8%, false positive rate < 0.2%), greatly save manpower and material resources, reduce production The cost has realized the rapid development of photovoltaic automation equipment.