Solar cell irradiation annealing furnace capable of uniformly and efficiently annealing

Abstract

The invention relates to a solar cell irradiation annealing furnace capable of uniformly and efficiently annealing. The solar cell irradiation annealing furnace comprises a furnace body, wherein the furnace body comprises an upper furnace body and a lower furnace body, at least one group of light sources are arranged in the upper furnace body, an air inlet is arranged between two adjacent groups of light sources or between the light sources and an upper furnace body framework, a diversion plate is arranged below the corresponding air inlet, a battery piece transmission device is arranged in the lower furnace body, a battery piece is horizontally transmitted in the battery piece transmission device and receives irradiation of the light sources, an air outlet is arranged in the lower furnace body below the battery piece and is externally connected with an air suction device, a temperature sensor is arranged in the furnace body, and the light sources, the battery piece transmission device, the air suction device and the temperature sensor are connected with a controller. The solar cell irradiation annealing furnace is simple in structure and reasonable in design, the processing temperature of the battery piece can be uniformly controlled, the problem of a non-uniform irradiation processing effect is solved, the irradiation annealing processing can be completed within 30 seconds, moreover, an LID is controlled within 1%, the processing time is shortened, and the annealing effect and the production efficiency are improved.

Description

technical field [0001] The invention relates to a solar cell radiation annealing furnace for uniform and efficient annealing, which can be used for radiation annealing treatment of solar cells. Background technique [0002] For P-type crystalline silicon solar cells, due to the existence of boron-oxygen pairs, the efficiency attenuation phenomenon (LID phenomenon) will occur in the early stage of use in the sunlight environment, especially the high-efficiency PERC cells that have emerged in recent years. This light-induced attenuation phenomenon especially serious. Studies have shown that using a specific light source to irradiate and anneal the cells at a certain temperature in advance will effectively prevent this light decay phenomenon from occurring. This technology has been theoretically broken and verified. The effect can drop the LID from around 5% to 1.5%-2%. However, in order to complete the irradiation annealing treatment within 30S, realize online continuous pro...

AI Technical Summary

Problems solved by technology

Generally speaking, the edges of the two sides of the cell first come into contact with the cooling air, which has a large air volume and low temperature. The cooling air contacted by the center of the cell has been preheated by the high temperature in the furnace. At the same time, a part of the cooling air enters the furnace. It has been drawn away from the edge of the cell, therefore, the cooling air in contact with the center of the cell has a high temperature and a small air volume, which will inevitably cause uneven cooling of the cell, thereby affecting the processing effect of the cell

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