A positive electrode of a crystalline silicon solar cell

Abstract

The invention discloses a positive electrode of a crystalline silicon solar cell. The positive electrode comprises a plurality of auxiliary grid lines arranged at intervals along a first direction and M fine grid lines arranged at intervals along a second direction. The fine grid lines are in electrical connection with the auxiliary grid lines. The width of each fine grid line is 0.10-0.25mm, wherein M=10-20. Each fine grid line is provided with N welding contact points arranged at intervals. The welding contact points are arranged on the fine grid lines in a laminated mode, and are electrically connected with the fine grid lines. The shapes of the welding contact points are elliptical. The scope of lengths of the short edges of the ovals are 0.2-1mm. The length of the short edge of each oval is greater than the width of each fine grid line. N=5-15. The positive electrode structure can achieve a purpose of reducing a shading area and guaranteeing smooth leading-out of currents.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a front electrode of a crystalline silicon solar cell. Background technique [0002] A crystalline silicon solar cell is an electronic component that converts sunlight energy into electrical energy. The preparation of crystalline silicon solar cells generally goes through processes such as texturing, diffusion, coating, screen printing, and sintering. Texturing is divided into single crystal and polycrystalline texturing. Monocrystalline cells use alkali texturing to form pyramid textures on the surface of silicon wafers. Polycrystalline cells use acid etching to form pitted textures on the surface of silicon wafers. The suede surface on the silicon surface can increase the absorption of sunlight on the surface of the battery to achieve light trapping; the diffusion process is to form a P-N junction inside the silicon wafer through thermal diffusion, so that when there is li...

AI Technical Summary

Problems solved by technology

During the welding process of the ultra-fine ribbon and the sub-grid, due to the small width of the sub-grid, the abnormality of the sub-grid is too low, etc., resulting in virtual welding or inability to weld, the power of the photovoltaic module is reduced.

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