Solar cell film edge cutting processing device and method

Abstract

The invention discloses a solar cell film edge cutting processing device. The solar cell film edge cutting processing device comprises an ultrafast laser device used for emitting laser. A laser beam expander, a reflector set, a flat field scanning mirror and a focusing mirror are arranged in the laser transmission direction in sequence. A focused laser beam emitted from the focusing mirror acts ona film workpiece to be processed, and the solar cell film is subjected to edge cutting processing through the focused laser beam. According to the solar cell film edge cutting processing device, a transparent conducting film has high absorption rate on ultrafast laser with high-peak power; the laser is focused on the surface of the film workpiece through beam expanding, two-dimensional scanning and the long-focus focusing mirror, and then the film outside a substrate film is removed and directly gasified. Meanwhile, the substrate film is not damaged. Big-area edge cutting on the flexible solar film cell is implemented well. The solar cell film edge cutting processing device has the beneficial effects of being high in laser energy utilization rate, small in heat effect, good in edge quality and high in edge cutting efficiency.

Description

technical field [0001] The invention relates to a processing device for a flexible thin film solar cell, in particular to a processing device and a processing method for clearing the edge of a solar cell film. Background technique [0002] Flexible thin-film solar cell is an emerging technology product in the world's solar industry. It is a solar cell made on a flexible substrate material such as PI. Compared with a glass substrate cell, its biggest feature is light weight, foldable and not easy Broken, so its wide application. The last process of flexible thin-film solar cells is to hermetically encapsulate the flexible substrate. In order to prevent short circuit of the battery and better hermetic packaging, the film in the area of ​​10mm to 15mm around the battery needs to be cleaned. Edge cleaning or edge sweeping was the earliest method of sandblasting. Although the cost was low, it caused serious environmental pollution, so it was gradually eliminated. [0003] Secon...

AI Technical Summary

Problems solved by technology

Now the industry usually uses 200W to 500W high-power infrared lasers for laser edge cleaning. Because this kind of laser is a side-pumped multimode laser, it consumes a lot of energy and has a short life. Damage, it is difficult to popularize and use in a short time

In the process of laser edge cleaning, it is generally believed that flexible solar films are directly vaporized under the action of laser. The total thickness of these films does not exceed 5um, and the flexible solar films of most batteries do not exceed 2um. The energy required can be obtained by the vaporization heat of related materials. It can be calculated, but it is certain that most of the energy is not absorbed and wasted directly when a high-power infrared laser of 200w to 500w is used for laser edge cleaning. A certain transmittance, and easy to cause damage to the flexible substrate material, obviously, using infrared lasers for edge cleaning of flexible solar cells is not a good choice

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