Laser scanning layering method of double-glass photovoltaic module

Abstract

The invention provides a laser scanning layering method for a double-glass photovoltaic module. The laser scanning layering method comprises the following steps: fixing the double-glass photovoltaic module on a laser scanning table; scanning and positioning the double-glass photovoltaic module to determine a silicon wafer cell area and a silicon wafer-free cell area of the double-glass photovoltaic module; setting a laser scanning path and a laser scanning process according to the determined silicon wafer cell area and the silicon wafer-free cell area; and scanning the double-glass photovoltaic module according to a set laser scanning path and a laser scanning process so as to realize layering of a glass panel, an adhesive film layer and a silicon wafer of the double-glass photovoltaic module. According to the invention, rapid and accurate layering of the photovoltaic module is realized through the laser scanning technology, so that the recovery process is simplified, and the recovery efficiency and quality are improved. Meanwhile, potential safety hazards and environmental pollution in the recycling process are reduced, the resource utilization rate is increased, the flexibility and expandability of the recycling process are enhanced, and the recycling requirements of photovoltaic modules of different types and specifications are met.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic module recycling, and in particular, relates to a laser scanning layering method for a double-glass photovoltaic module. Background Art

[0002] Double-glass photovoltaic modules are widely used in the photovoltaic industry due to their excellent physical and mechanical properties. However, in the recycling and reuse process of double-glass photovoltaic modules, how to achieve efficient and lossless layer separation has become an urgent problem to be solved.

[0003] Among the existing recycling technologies, double-glass photovoltaic modules are generally recycled through mechanical methods, high-temperature incineration methods and chemical solvent methods. However, these three methods have problems to varying degrees. Among them, the materials separated by mechanical methods have low purity and severe damage; the high-temperature incineration method has high energy consumption and high cost; the chemical solvent method has a long processing cycle and serious solvent pollution. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides a new laser scanning layering method for double-glass photovoltaic modules which is low in energy consumption, damage-free, clean and pollution-free.

[0005] According to one aspect of the present invention, a laser scanning layering method for a double-glass photovoltaic module includes the following steps: 1) fixing the double-glass photovoltaic module on a laser scanning platform; 2) scanning and positioning the double-glass photovoltaic module to determine the silicon wafer cell area and the silicon wafer-free cell area of ​​the double-glass photovoltaic module; 3) setting a laser scanning path and a laser scanning process according to the determined silicon wafer cell area and the silicon wafer-free cell area; 4) scanning the double-glass photovoltaic module according to the set laser scanning path and laser scanning process to achieve layering of the glass panel, the adhesive film layer and the silicon wafer of the double-glass photovoltaic module.

[0006] In an example of the laser scanning layering method provided in the above aspect, the step 1) further includes: preheating the double-glass photovoltaic module.

[0007] In an example of the laser scanning stratification method provided in the above aspect, the step 4) further includes: heating the double-glass photovoltaic module by using a heating device, and the heating temperature is 50-250°C.

[0008] In an example of the laser scanning layering method provided in the above aspect, the heating device includes at least one of an infrared heating device, a hot air circulation heating device, a microwave heating device, a laser heating device, a resistance heating device, and an induction heating device.

[0009] In an example of the laser scanning stratification method provided in the above aspect, the laser scanning path includes: first scanning the silicon wafer cell area without silicon wafer of the double-glass photovoltaic module to achieve stratification of the silicon wafer cell area without silicon wafer; then quickly scanning the silicon wafer cell area of ​​the double-glass photovoltaic module with the layered silicon wafer cell area without silicon wafer to achieve stratification of the silicon wafer cell area.

[0010] In an example of the laser scanning stratification method provided in the above aspect, the laser scanning process of the silicon wafer-free battery area includes: repeatedly scanning the silicon wafer-free battery area with a high-frequency laser until the temperature of the silicon wafer-free battery area is 400-600°C.

[0011] In an example of the laser scanning layering method provided in the above aspect, the laser scanning process of the silicon wafer battery area includes: scanning the silicon wafer battery area with ordinary laser until the temperature of the silicon wafer battery area is 400-600°C.

[0012] In an example of the laser scanning layering method provided in the above aspect, step 4) is implemented by multiple scanning laser heads, and the scanning laser heads are used to generate scanning lasers with a laser power greater than 200W. The working mode of the scanning laser heads is continuous mode or pulse mode. The scanning speed of the scanning laser heads is 1000-100000mm / min, and the overlap rate of the laser generated by the scanning laser heads is greater than 0.

[0013] In an example of the laser scanning layering method provided in the above aspect, the laser scanning platform is sealed and covered, wherein an exhaust system is used to suck and process waste gas generated during the scanning process of the laser scanning platform.

[0014] In an example of the laser scanning layering method provided in the above aspect, before performing step 1), the laser scanning method further includes: cleaning the double-glass photovoltaic component to ensure that the surface of the double-glass photovoltaic component is clean and free of impurities.

[0015] Beneficial effects: The present invention uses laser scanning technology to achieve rapid and accurate stratification of photovoltaic modules, thereby simplifying the recycling process and improving recycling efficiency and quality. At the same time, the present invention also reduces safety hazards and environmental pollution during the recycling process, improves resource utilization, and enhances the flexibility and scalability of the recycling process to meet the recycling needs of photovoltaic modules of different types and specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other aspects, features and advantages of the embodiments of the present invention will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0017] Figure 1is a flow chart of a laser scanning layering method for a double-glass photovoltaic module according to an embodiment of the present invention;

[0018] Figure 2 Schematic diagram of a silicon wafer cell area and a non-silicon wafer cell area of ​​a double-glass photovoltaic module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention may be implemented in many different forms, and the present invention should not be construed as being limited to the specific embodiments set forth herein. On the contrary, these embodiments are provided to explain the principles of the present invention and their practical applications, so that other persons skilled in the art can understand the various embodiments of the present invention and various modifications suitable for specific intended applications.

[0020] As used herein, the term "including" and its variations represent open terms, meaning "including but not limited to". The terms "based on", "according to", etc. mean "based at least in part on", "based at least in part on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other definitions may be included below, whether explicit or implicit. Unless the context clearly indicates otherwise, the definition of a term is consistent throughout the specification.

[0021] The terms "exemplary," "example," and the like used throughout this specification mean "used as an example, instance, or illustration" and do not mean "preferred" or "advantageous" over other embodiments. The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, these techniques can be implemented without these specific details. In some instances, in order to avoid obscuring the concepts of the described embodiments, well-known structures and devices are shown in block diagram form.

[0022] Figure 1 4 is a flow chart of a laser scanning layering method for a double-glass photovoltaic module according to an embodiment of the present invention. Figure 2 Schematic diagram of a silicon wafer cell area and a non-silicon wafer cell area of ​​a double-glass photovoltaic module according to an embodiment of the present invention.

[0023] Reference Figure 1 , in step S110, the double-glass photovoltaic module is fixed on the laser scanning platform.

[0024] In one example, the size of the double-glass photovoltaic module is 2.5m×1.3m, and it includes a glass front panel, a front adhesive film layer (EVA), a silicon wafer, a back adhesive film layer (EVA), and a glass back panel with five layers of fully enclosed structure. In another example, the size of the double-glass photovoltaic module is 2.5m×1.3m, and it includes a glass front panel, a front adhesive film layer (POE), a silicon wafer, a back adhesive film layer (POE), and a glass back panel with five layers of fully enclosed structure.

[0025] In other embodiments, before performing step S110 , the double-glass photovoltaic module may be cleaned to keep the surface of the double-glass photovoltaic module clean and free of impurities.

[0026] In other embodiments, before performing step S110, the double-glass photovoltaic module may be conveyed to the laser scanning platform via a conveyor belt.

[0027] In other embodiments, in step S110, after the double-glass photovoltaic assembly is fixed on the laser scanning table, an auxiliary heating table may be used to preheat the double-glass photovoltaic assembly, wherein the preheating temperature of the preheating treatment may be 200°C.

[0028] In step S120, the double-glass photovoltaic module is scanned and positioned to determine the silicon wafer cell area and the non-silicon wafer cell area of ​​the double-glass photovoltaic module ( Figure 2 shown).

[0029] Specifically, the double-glass photovoltaic module is scanned and positioned using a visual sensor to determine the silicon wafer cell area and the non-silicon wafer cell area of ​​the double-glass photovoltaic module.

[0030] In step S130, a laser scanning path and a laser scanning process are set according to the determined silicon wafer battery area and the non-silicon wafer battery area.

[0031] Specifically, after determining the silicon wafer cell area and the silicon wafer-free cell area of ​​the double-glass photovoltaic module, they can be accurately marked in a preset software system, and the laser scanning path and laser scanning process can be set according to the distribution of the silicon wafer cell area and the silicon wafer-free cell area of ​​the double-glass photovoltaic module.

[0032] In one example, the laser scanning path includes: first scanning the silicon wafer cell area without silicon wafer of the double-glass photovoltaic module to achieve stratification of the silicon wafer cell area without silicon wafer; then quickly scanning the silicon wafer cell area of ​​the double-glass photovoltaic module with the stratified silicon wafer cell area without silicon wafer to achieve stratification of the silicon wafer cell area.

[0033] In one example, the laser scanning process of the silicon-free cell area includes: repeatedly scanning the silicon-free cell area with a high-frequency laser until the temperature of the silicon-free cell area is 400-600° C. Preferably, until the temperature of the silicon-free cell area is above 500° C., for example, for an EVA film layer. Preferably, until the temperature of the silicon-free cell area is above 550° C., for example, for a POE film layer.

[0034] In one example, the laser scanning process of the silicon wafer battery area includes: scanning the silicon wafer battery area with a common laser until the temperature of the silicon wafer battery area is 400-600° C. Preferably, until the temperature of the silicon wafer battery area is above 500° C., for example, for an EVA film layer. Preferably, until the temperature of the silicon wafer battery area is above 550° C., for example, for a POE film layer.

[0035] In step S140, the double-glass photovoltaic module is scanned according to the set laser scanning path and laser scanning process to achieve the delamination of the glass panel, the adhesive film layer and the silicon wafer of the double-glass photovoltaic module.

[0036] Specifically, the laser scanning device is turned on, and the laser scanning device scans the double-glass photovoltaic panel according to the set laser scanning path and laser scanning process to achieve the stratification of the three-layer structure of glass panel, film layer and silicon wafer. Furthermore, the laser stratification of the double-glass photovoltaic module is completed by controlling the laser scanning process parameters for the silicon wafer cell area and the non-silicon wafer cell area. The laser scanning process parameters mainly include the number of laser beams, laser power, pulse frequency, scanning speed, spot size, overlap rate, number of scans, etc.

[0037] In other embodiments, step S140 can be performed using multiple scanning laser heads of a laser scanning device, wherein the scanning laser head is used to generate a scanning laser with a laser power greater than 200 W, the working mode of the scanning laser head is a continuous mode or a pulse mode, the scanning speed of the scanning laser head is 1000-100000 mm / min, and the overlap rate of the laser generated by the scanning laser head is greater than 0.

[0038] Preferably, step S140 is performed using 5 scanning laser heads, the laser power of the scanning laser generated by the scanning laser head is 1000W, the working mode is pulse mode, the scanning speed is 50000mm / min, and the laser overlap rate is 10%, but the present invention is not limited to this.

[0039] In other embodiments, when performing step S140, the double-glass photovoltaic module may be heated by a heating device at a temperature of 50-250° C. In one example, the heating device includes at least one of an infrared heating device, a hot air circulation heating device, a microwave heating device, a laser heating device, a resistance heating device, and an induction heating device.

[0040] In addition, in other embodiments, the laser scanning platform is sealed and covered, wherein an exhaust system can be used to suck and process waste gas generated during the scanning process of the laser scanning platform.

[0041] In summary, the laser scanning layering method of the double-glass photovoltaic module according to the embodiment of the present invention has the following advantages:

[0042] Efficient and accurate stratification capability: The laser scanning stratification method according to the embodiment of the present invention utilizes laser scanning technology to accurately control the focal position and scanning path of the laser beam. The high energy density and precise controllability of the laser ensure the rapid and accurate separation process, thereby achieving efficient and accurate separation of the materials of each layer of the double-glass photovoltaic module, reducing material waste and damage;

[0043] Non-contact processing, protecting the integrity of materials: The laser scanning layering method according to an embodiment of the present invention is a non-contact processing technology, which avoids the physical damage and scratches that may be produced in traditional mechanical separation methods, helps to maintain the integrity and quality of recycled materials, and improves the reuse value of recycled materials;

[0044] Environmental protection, energy saving, safe and reliable: The laser scanning layering method according to the embodiment of the present invention does not need to use a large amount of chemical solvents or produce harmful emissions, which meets environmental protection requirements. At the same time, the energy utilization rate of the laser beam is high, which reduces energy consumption and reduces recycling costs. At the same time, the laser scanning layering method according to the embodiment of the present invention does not produce pollutants such as waste liquid and waste gas, and has low energy consumption, which meets the requirements of environmental protection and energy saving.

[0045] The process is simple and flexible and scalable: The laser scanning stratification method according to the embodiment of the present invention realizes the rapid stratification of photovoltaic modules through laser scanning technology, simplifies the recycling process, and improves the recycling efficiency. In addition, the laser scanning stratification method according to the embodiment of the present invention can adapt to the recycling needs of photovoltaic modules of different types and specifications, and has flexibility and scalability.

[0046] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

Claims

1. A laser scanning layering method for double-glass photovoltaic modules, characterized in that: The laser scanning layering method comprises the following steps: 1) Fix the double-glass photovoltaic module on the laser scanning platform; 2) Scanning and positioning the double-glass photovoltaic module to determine the silicon wafer cell area and the non-silicon wafer cell area of ​​the double-glass photovoltaic module; 3) setting a laser scanning path and a laser scanning process according to the determined silicon wafer battery area and the non-silicon wafer battery area; 4) Scanning the double-glass photovoltaic module according to the set laser scanning path and laser scanning process to achieve the delamination of the glass panel, the film layer and the silicon wafer of the double-glass photovoltaic module.

2. The laser scanning layering method according to claim 1, characterized in that: The step 1) also includes: preheating the double-glass photovoltaic module.

3. The laser scanning layering method according to claim 1 or 2, characterized in that: The step 4) further comprises: heating the double-glass photovoltaic module by a heating device, the heating temperature being 50-250°C.

4. The laser scanning layering method according to claim 3, characterized in that: The heating device includes at least one of an infrared heating device, a hot air circulation heating device, a microwave heating device, a laser heating device, a resistance heating device, and an induction heating device.

5. The laser scanning layering method according to claim 1, characterized in that: The laser scanning path includes: first scanning the non-silicon wafer cell area of ​​the double-glass photovoltaic module to achieve stratification of the non-silicon wafer cell area; then quickly scanning the silicon wafer cell area of ​​the double-glass photovoltaic module with the stratified non-silicon wafer cell area to achieve stratification of the silicon wafer cell area.

6. The laser scanning layering method according to claim 1, characterized in that: The laser scanning process of the silicon-free battery area includes: repeatedly scanning the silicon-free battery area with a high-frequency laser until the temperature of the silicon-free battery area is 400-600°C.

7. The laser scanning layering method according to claim 1, characterized in that: The laser scanning process of the silicon wafer battery area includes: scanning the silicon wafer battery area with ordinary laser until the temperature of the silicon wafer battery area is 400-600°C.

8. The laser scanning layering method according to claim 1, characterized in that: The step 4) is implemented by multiple scanning laser heads, which are used to generate scanning lasers with a laser power greater than 200W. The working mode of the scanning laser head is a continuous mode or a pulse mode. The scanning speed of the scanning laser head is 1000-100000mm / min, and the overlap rate of the laser generated by it is greater than 0.

9. The laser scanning layering method according to claim 1, characterized in that: The laser scanning platform is sealed and covered, wherein an exhaust system is used to suck and process waste gas generated during the scanning process of the laser scanning platform.

10. The laser scanning layering method according to claim 1, characterized in that: Before performing step 1), the laser scanning method further comprises: cleaning the double-glass photovoltaic assembly to ensure that the surface of the double-glass photovoltaic assembly is clean and free of impurities.

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