Ultraviolet laser cutting solar screen film to extend service life

According to the cell cost composition data of the China Photovoltaic Industry Association: silicon cost accounted for 65%, non-silicon cost accounted for 35%, and the metalization process accounted for more than 20% of the battery cost, so research and development promote the progress of metalization New technologies are crucial to reducing non-silicon costs. The metallization process usually uses screen printing equipment to print the paste on the surface of the battery to form circuits and electrodes. Screen, paste and printing sintering are the three key technologies.

       Laser cutting is a revolutionary screen processing technology that contributes to the industry's cost reduction and efficiency enhancement. Compared with the traditional exposure screen process, the laser cutting screen has the following advantages:

       1. Screen service life: The screen plate is made of PI material instead of photosensitive material, which has better abrasion resistance. With advanced two-time printing technology, the service life of the screen plate can reach more than 2 times, which directly reduces the monolithic battery. The screen plates share the cost; in addition, the reduction in screen plate replacement frequency increases the production capacity of the screen printing process and reduces the loss of silver paste, which further reduces non-silicon costs;

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       2. The process is more environmentally friendly: laser processing belongs to physical processing, no chemical developer, no waste liquid discharge, more environmentally friendly, and greatly improves the working environment of employees;

       3. Pattern changes: directly draw electrode patterns in the laser marking software, eliminating the need to make exposure film steps, changing quickly, and providing customers with customized development solutions;

       4. Processing accuracy and quality: The yield rate is greatly improved. In addition, laser processing can obtain excellent opening taper, finer grid line width, and optimize the aspect ratio of the printed electrode, thereby further reducing the unit consumption of silver paste.