EVA heat treatment method of waste crystalline silicon solar cell module

A technology of solar cells and heat treatment methods, applied in waste treatment, electronic waste recycling, solid waste removal, etc., can solve problems such as high cost, volatile organic solvents, environmental hazards, etc., to shorten the processing cycle, avoid environmental pollution, The effect of easy operation

Active Publication Date: 2014-08-13
刘景洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the test data of the peel strength of EVA by solar cell manufacturers according to the test method GB / T2790, it can be known that the peel strength of EVA and the back sheet is ≥35N / cm, and the peel strength of the glass is ≥35N / cm, and manual peeling is difficult to achieve
The research on the dissolution and separation of EVA with organic solvents shows that the treatment process takes a long time, about 7-10 days, and the cost is high. Organic solvents are volatile and easy to cause harm to the environment.

Method used

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  • EVA heat treatment method of waste crystalline silicon solar cell module
  • EVA heat treatment method of waste crystalline silicon solar cell module

Examples

Experimental program
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Embodiment 1

[0027] A kind of waste crystalline silicon solar cell module EVA heat treatment method, described method comprises the following steps:

[0028] a. Pretreatment

[0029] Firstly, pretreatment is carried out, and the waste crystalline silicon solar panel is heated on an electric heating plate to remove the TPT backsheet on the back;

[0030] b. Pyrolysis treatment

[0031] Put the battery plate without TPT into the quartz tube, then put it into the tube furnace, feed gas into the system, start to heat up, and keep it for a period of time after rising to a certain temperature, and take out the separated glass after the pyrolysis furnace cools down and batteries.

[0032] Further, the heating temperature in step a is 100° C. to 150° C., and the heating time is 3 minutes to 10 minutes.

[0033] Further, the gas described in step b is nitrogen or air.

[0034] Further, the specific temperature described in step b is 540°C to 580°C.

[0035] Further, after the temperature is ra...

Embodiment 2

[0038] This embodiment is an optimized solution based on the embodiment 1, and provides a method for heat treatment of waste crystalline silicon solar cell module EVA. For the parts in this embodiment that are the same as those in Embodiment 1, please refer to the content disclosed in Embodiment 1 for understanding, and the content disclosed in Embodiment 1 should also be regarded as the content of this embodiment, and will not be described repeatedly here.

[0039] This embodiment is a specific process of heat-treating EVA in a nitrogen atmosphere.

[0040] First, put the solar panel into an oven, bake it at 70°C for 10 days, and then heat it on a 140°C electric heating plate for 5 minutes to remove the TPT backsheet on the back.

[0041] Put the TPT-removed cell plate into a quartz tube and put it into a tube furnace. according to figure 2 way to connect. Introduce high-purity nitrogen into the system, the gas flow rate is 65ml / min, start heating after purging for 15 min...

Embodiment 3

[0043] This embodiment is an optimized solution based on the embodiment 1, and provides a method for heat treatment of waste crystalline silicon solar cell module EVA. For the parts in this embodiment that are the same as those in Embodiment 1, please refer to the content disclosed in Embodiment 1 for understanding, and the content disclosed in Embodiment 1 should also be regarded as the content of this embodiment, and will not be described repeatedly here.

[0044] This embodiment is a specific process of heat-treating EVA in an air atmosphere.

[0045] First, put the solar panel into an oven, bake it at 70°C for 10 days, and then heat it on a 140°C electric heating plate for 5 minutes to remove the TPT backsheet on the back.

[0046] Put the TPT-removed cell plate into a quartz tube and put it into a tube furnace. according to figure 1 way to connect. Use an air pump to feed air into the system, the gas flow rate is 70ml / min, start heating after purging for 15 minutes, th...

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Abstract

The invention provides an EVA heat treatment technology of a waste crystalline silicon solar cell module, and can realize the effective separation of toughened glass, crystalline silicon cell pieces and a back plate of a waste crystalline silicon solar panel. The whole process has simple operation, no EVA residue in the heat treatment process, and the generated waste gas enters into an incinerator for incineration to avoid secondary pollution. The invention adopts the heat treatment process to effectively avoid environmental pollution caused by organic solvent volatilization in the process of EVA dissolution by an organic solvent, and also greatly shortens the processing cycle.

Description

technical field [0001] The invention relates to the field of environmental protection technology for the recycling and processing of waste materials, in particular to an EVA heat treatment technology widely used in packaging materials of ethylene-vinyl acetate copolymer (EVA) in waste crystalline silicon solar cell packaging technology. Background technique [0002] The encapsulation process of solar cells mainly depends on the encapsulation material used. For solar modules using EVA film as encapsulation material, vacuum lamination technology is generally adopted. The steps are: firstly stack the battery components together according to the structure of front plate (glass) / EVA / cell / EVA / back plate (TPT) ( figure 1 ), put it into the vacuum laminator, vacuumize for about 5 minutes, then heat the laminated assembly while keeping the vacuum in the upper and lower chambers of the laminator, then cancel the vacuum in the upper chamber of the laminator and return to normal pressur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCY02W30/20Y02W30/82
Inventor 刘景洋乔琦郭玉文董莉
Owner 刘景洋
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