Annealing method and annealing device of PERC battery

An annealing device and annealing technology, applied in the field of solar cells, can solve the problems of more attenuation of the average conversion efficiency of the cell, poor LID uniformity of the cell, and reduced carrier life, so as to improve the anti-LID performance, improve the conversion efficiency, The effect of promoting passivation

Active Publication Date: 2022-04-12
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The boron-oxygen complex is a metastable defect that reduces the lifetime of minority carriers and leads to severe LID phenomenon
[0003] CN109616555A discloses a method and application for improving the anti-light attenuation ability of solar cells. The method reduces the light attenuation amplitude by adopting the injection mode of decreasing current and matching the temperature changes at different stages, but the time of each working area in the method It is longer, the production efficiency is relatively low, and the LID uniformity of the upper, middle and lower parts of each station is poor
[0004] CN113241390A discloses a crystalline silicon solar cell light injection method and its system and cell, the method makes the light injection energy of the solar cell higher by laser irradiation, although the average value of LID can be reduced, the average conversion efficiency of the cell is attenuated more

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  • Annealing method and annealing device of PERC battery
  • Annealing method and annealing device of PERC battery
  • Annealing method and annealing device of PERC battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] This embodiment provides an annealing method for a PERC battery, the annealing method comprising the following steps:

[0058] (1) preheating the battery sheet containing the passivation film to obtain a heat-treated battery sheet; in the preheating treatment, the first temperature zone is the area where the front side of the battery is preheated, and the temperature is 420 ° C, and the second The temperature zone is the area where the back of the battery is preheated, and the temperature is 360°C;

[0059] (2) Light-treat the heat-treated battery sheet obtained in step (1) for 15 seconds at a temperature of 180°C. The light source for the light treatment is an LED light source with a wavelength of 580nm and an intensity of 84kW / m 2 , the output power is 70%; then cooling treatment is carried out for 10s until the end point temperature is 40°C to obtain an annealed battery sheet.

[0060] This embodiment also provides an annealing device for a PERC battery, such as fi...

Embodiment 2

[0065] This embodiment provides an annealing method for a PERC battery, the annealing method comprising the following steps:

[0066] (1) preheating the battery sheet containing the passivation film to obtain a heat-treated battery sheet; in the preheating treatment, the first temperature zone is the area where the front side of the battery is preheated, and the temperature is 440 ° C, and the second The temperature zone is the area where the back of the battery is preheated, and the temperature is 380°C;

[0067] (2) Light-treat the heat-treated battery sheet obtained in step (1) for 18 seconds at a temperature of 210°C. The light source for the light treatment is an LED light source with a wavelength of 587nm and an intensity of 96kW / m 2 , the output power is 80%; then cooling treatment is carried out for 13s until the final temperature is 45°C to obtain an annealed battery sheet.

[0068] This embodiment also provides an annealing device for the PERC battery as described i...

Embodiment 3

[0070] This embodiment provides an annealing method for a PERC battery, the annealing method comprising the following steps:

[0071] (1) preheating the battery sheet containing the passivation film to obtain a heat-treated battery sheet; in the preheating treatment, the first temperature zone is the area where the front of the battery is preheated, and the temperature is 460 ° C, and the second The temperature zone is the area where the back of the battery is preheated, and the temperature is 400°C;

[0072] (2) Light-treat the heat-treated battery sheet obtained in step (1) for 20 seconds at a temperature of 240° C., and the light source for the light treatment is an LED light source with a wavelength of 595 nm and an intensity of 108 kW / m 2 , the output power is 90%; then cooling treatment is carried out for 15s until the final temperature is 50°C to obtain an annealed battery sheet.

[0073] This embodiment also provides an annealing device for the PERC battery as describ...

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Abstract

The invention relates to an annealing method and an annealing device of a PERC battery, and the annealing method comprises the following steps: (1) carrying out preheating treatment on a battery piece containing a passive film to obtain a heat treatment battery piece, and respectively setting a first temperature zone and a second temperature zone on two sides of the battery piece in the preheating treatment, the temperature of the first temperature area is higher than that of the second temperature area; and (2) sequentially carrying out illumination treatment and cooling treatment on the heat-treated battery piece obtained in the step (1) to obtain an annealed battery piece. The annealing device comprises a preheating area, an illumination area and a cooling area which are sequentially arranged along the moving direction of the battery piece; an upper lamp tube is arranged at the upper part of the preheating area; and a lower lamp tube is arranged at the lower part of the preheating area. According to the annealing method and the annealing device provided by the invention, passivation of the boron-oxygen complex can be promoted, and the conversion efficiency and the anti-LID performance of the battery piece are improved.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to an annealing method and annealing device for PERC cells. Background technique [0002] PERC (Passivated emitter and rear cell) battery technology is an innovative technology for P-type solar cells. This process can greatly reduce the recombination speed of the back surface through the dielectric passivation film on the back surface, and at the same time improve the light reflection of the back surface, increasing the Efficient absorption of long-wavelength incident photons. However, the photogenerated minority carriers (electrons) generated on the back surface need to go through a long path to be effectively separated by the front p-n junction and collected by the electrodes. Therefore, PERC cells are prone to power attenuation during the illumination process, also known as light induced degradation (LID). The main reason for LID in P-doped PERC solar cells is that boron and oxygen c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18
CPCY02P70/50
Inventor 楼杭晓刘延东陈泽邦
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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