Study solar cell laser cutting technology experiment

With the diversified development of PV module market and technology, its application in various fields is becoming more and more widespread. This requires the type of module to adapt to the diversified photovoltaic market, and when the power and voltage required by the market cannot be balanced. , cutting the battery can not be avoided.

At present, lasers are usually used to cut the cells. However, the intensity and density of the lasers are different, and the degree of damage to the cells is different. In severe cases, the leakage current of the cut cells is too large and the damage is very wide.

In this paper, different laser intensity and density were experimentally adjusted to determine the effect of laser intensity and density on cell slice cutting.

Laser cutting is one of the most widely used laser processing technologies. The principle is that the laser light is irradiated to the material after focusing, so that the material temperature rises sharply to melting or gasification. As the relative motion of the laser and the material to be cut, cutting is performed. A slit is formed in the material to achieve the purpose of cutting.

Laser cutting holds a large proportion in laser processing applications (currently laser cutting accounts for more than 70% of laser processing), and applications in the photovoltaic industry are also becoming more and more widespread. Compared with the traditional cutting methods, laser cutting has unparalleled advantages, mainly in:

1. High cutting precision, narrow slits, good quality, small heat affected zone, and smooth and smooth cutting surface;

2, cutting speed, high processing efficiency;

3, is a non-contact cutting, there is no mechanical processing force, will not produce deformation, there is no pollution of the processing debris, oil, noise and other pollution, is a green environmental protection processing;

4, cutting ability, can cut almost any material.

However, there are some disadvantages in laser-cutting solar cells, which are mainly manifested in:

1. When the laser is cutting, it will cause some damage to the crystal phase of the battery, which will cause some damage and cracking of the battery.

2. When the crystal phase of the cell sheet is damaged, the solar module produced may have potential leakage during operation. This article mainly through experiments to verify the laser cutting, the laser intensity and density of solar cells.