Photovoltaic power generation device with high stability

Abstract

The utility model discloses a kind of photovoltaic power generation equipment with high stability, including photovoltaic power generation component, support frame and electric connection system, the photovoltaic power generation component is fixedly installed on support frame, and with electric connection system form complete power generation loop;The photovoltaic power generation component includes asymmetric vacuum glass packaging layer, first adhesive film layer, photovoltaic cell layer, second adhesive film layer and transparent substrate;The asymmetric vacuum glass packaging layer, by the first glass substrate of light-receiving side and the second glass substrate of backlight side are encapsulated to form vacuum cavity by sealing element, wherein the thickness of the first glass substrate is 5-8mm, and the thickness of second glass substrate is 2-3mm.The utility model provides reliable technical solution for the application of photovoltaic power generation equipment in high-temperature area by using asymmetric vacuum structure combined with porous silica gel buffer layer collaborative innovation.

Description

Technical Field

[0001] This utility model relates to a power generation device, specifically a photovoltaic power generation device with high stability. Background Technology

[0002] The stability of photovoltaic (PV) power generation equipment is significantly affected by temperature, exhibiting the following prominent problems: efficiency degradation: high temperatures impact the operating efficiency of PV power generation equipment; for example, the output power of conventional crystalline silicon cells decreases by 3%-5% for every 10°C increase in operating temperature. Thermal stress issues: under diurnal temperature cycling, interfacial stress is generated between material layers, leading to delamination and microcracks in the cells. Existing PV modules mostly use ordinary glass encapsulation, which has limited thermal insulation performance and cannot effectively suppress temperature fluctuations. Especially in high-temperature regions, the operating temperature of PV modules often exceeds 70°C, severely affecting power generation efficiency and reliability. Therefore, there is an urgent need to develop a PV power generation device with high stability. Utility Model Content

[0003] The purpose of this invention is to provide a photovoltaic power generation device with high stability, aiming to solve the problems in the background art mentioned above.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A highly stable photovoltaic power generation device includes a photovoltaic power generation module, a support frame, and an electrical connection system. The photovoltaic power generation module is fixedly mounted on the support frame and forms a complete power generation circuit with the electrical connection system. The photovoltaic power generation module includes an asymmetric vacuum glass encapsulation layer, a first encapsulating film layer, a photovoltaic cell layer, a second encapsulating film layer, and a transparent substrate. The photovoltaic cell layer is composed of multiple photovoltaic cell units for photoelectric conversion. The asymmetric vacuum glass encapsulation layer is formed by sealing a first glass substrate on the light-receiving side and a second glass substrate on the backlight side with a sealing element to form a vacuum cavity. A column array is uniformly distributed within the vacuum cavity. The first encapsulating film layer is disposed between the asymmetric vacuum glass encapsulation layer and the photovoltaic cell layer. The transparent substrate is located on the backlight side of the photovoltaic cell layer, and the second encapsulating film layer is disposed between the transparent substrate and the photovoltaic cell layer. The thickness of the first glass substrate is 5-8 mm, and the thickness of the second glass substrate is 2-3 mm.

[0006] Furthermore, the first glass substrate is tempered coated glass, with an anti-reflective coating on the outer surface and a Low-E coating on the inner surface.

[0007] Furthermore, the first adhesive film layer is an EVA or PVB adhesive film; the second adhesive film layer is an EVA or PVB adhesive film.

[0008] Furthermore, the photovoltaic cell layer includes multiple thin-film cells interconnected by flexible conductive adhesive.

[0009] Furthermore, the photovoltaic power generation module also includes a first porous silicone buffer layer and a second porous silicone buffer layer; wherein the first porous silicone buffer layer is disposed between the first adhesive film layer and the second glass substrate, and is used to absorb local pressure differences caused by unevenness of the second glass substrate; the second porous silicone buffer layer is disposed between the second adhesive film layer and the transparent substrate, and is used to absorb local pressure differences caused by unevenness of the transparent substrate.

[0010] Furthermore, the thickness of both the first porous silicone buffer layer and the second porous silicone buffer layer is 0.2-0.5 mm, and the porosity is 50%-70%.

[0011] Furthermore, the porosity of the first porous silicone buffer layer is at least 20% lower on the side near the second glass substrate than on the side away from the second glass substrate, and forms a continuous gradient transition along the side near the second glass substrate to the side away from the second glass substrate; the porosity of the second porous silicone buffer layer is at least 20% lower on the side near the transparent substrate than on the side away from the transparent substrate, and forms a continuous gradient transition along the side near the transparent substrate to the side away from the transparent substrate.

[0012] Furthermore, a connecting layer is provided between the first porous silicone buffer layer and the second glass substrate, and between the second porous silicone buffer layer and the transparent substrate, wherein the thickness of the connecting layer is 0.1μm-10μm.

[0013] Furthermore, the connecting layer is a silane coupling agent or a UV-curable adhesive.

[0014] Furthermore, the sealing element includes a low-melting-point glass powder sealing layer, which is formed by sintering glass powder with a softening temperature of 360℃-400℃, so that the vacuum degree of the vacuum chamber is maintained at 0.01Pa-10Pa.

[0015] Beneficial effects

[0016] This invention employs an asymmetric vacuum structure combined with a porous silicone buffer layer for synergistic innovation. On one hand, the vacuum cavity and the Low-E film work together to reduce the operating temperature of the photovoltaic power generation module and improve high-temperature power attenuation, fundamentally solving the temperature sensitivity problem of photovoltaic power generation equipment. On the other hand, the porous silicone buffer layer effectively reduces local stress cracks, enabling the photovoltaic power generation module to maintain stable power output, providing a reliable technical solution for the application of photovoltaic power generation equipment in high-temperature regions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the photovoltaic power generation module proposed in this utility model.

[0018] Figure Labels

[0019] 1. Asymmetric vacuum glass encapsulation layer; 11. Vacuum cavity; 12. Support pillar; 131. First glass substrate; 132. Second glass substrate; 14. Sealing element; 21. First porous silicone buffer layer; 22. Second porous silicone buffer layer; 31. First adhesive film layer; 32. Second adhesive film layer; 4. Photovoltaic cell layer; 5. Transparent substrate. Detailed Implementation

[0020] To clearly illustrate the design concept of this utility model, the following description is provided in conjunction with examples.

[0021] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the examples of the present invention. Obviously, the described examples are only a part of the examples of the present invention, and not all of them. Based on the examples of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0022] In the description of this embodiment, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0023] This utility model provides a highly stable photovoltaic power generation device, including a photovoltaic power generation module, a support frame, and an electrical connection system. The photovoltaic power generation module is fixedly installed on the support frame and forms a complete power generation circuit with the electrical connection system; the photovoltaic power generation module, as referenced... Figure 1The system includes an asymmetric vacuum glass encapsulation layer 1, a first encapsulating film layer 31, a photovoltaic cell layer 4, a second encapsulating film layer 32, and a transparent substrate 5. The photovoltaic cell layer 4 is composed of multiple photovoltaic cell units for photoelectric conversion. The asymmetric vacuum glass encapsulation layer 1 is formed by sealing a first glass substrate 131 on the light-receiving side and a second glass substrate 132 on the backlight side through a sealing member 14 to form a vacuum cavity 11. An array of pillars 12 is uniformly distributed in the vacuum cavity 11. The first encapsulating film layer 31 is disposed between the asymmetric vacuum glass encapsulation layer 1 and the photovoltaic cell layer 4. The transparent substrate 5 is located on the backlight side of the photovoltaic cell layer 4, and the second encapsulating film layer 32 is disposed between the transparent substrate 5 and the photovoltaic cell layer 4. The thickness of the first glass substrate 131 is 5-8 mm, and the thickness of the second glass substrate 132 is 2-3 mm. The first glass substrate 131 is tempered coated glass. An anti-reflective film is coated on the outer surface of the first glass substrate 131, and a Low-E film is coated on the inner surface. The outer surface refers to the side directly exposed to the atmospheric environment, and the inner surface refers to the side facing the vacuum cavity 11. The anti-reflective film reduces the surface reflectivity of the first glass substrate 131, increases the effective light capture amount, and improves the visible light transmittance. The Low-E film and the vacuum cavity 11 work together to suppress heat conduction. During operation, sunlight first contacts the outer surface, and the anti-reflective film minimizes incident light loss. Infrared rays pass through the glass and are reflected by the inner surface. The Low-E film reflects the infrared energy back into the vacuum cavity. Multiple reflections within the vacuum cavity gradually attenuate the infrared energy, preventing heat from reaching the photovoltaic cells. The synergistic effect of the thick glass and the Low-E film blocks external heat radiation input, and the vacuum cavity further suppresses heat conduction. Simultaneously, the thin glass promotes internal heat dissipation. This "high-resistance input - low-resistance output" heat flow path helps reduce the module's operating temperature. Furthermore, the thicker first glass substrate 131 on the light-receiving side can withstand external wind pressure and hail impacts, while the thinner second glass substrate 132 on the backlight side contributes to the lightweighting of the photovoltaic module. The first encapsulant layer 31 is an EVA or PVB encapsulant film; the second encapsulant layer 32 is also an EVA or PVB encapsulant film. The encapsulant layer design allows for a gradual change in the incident light refractive index, reducing interface reflection losses and significantly improving light capture efficiency. The photovoltaic cell layer 4 includes multiple thin-film cells interconnected by flexible conductive adhesive.The photovoltaic power generation module also includes a first porous silicone buffer layer 21 and a second porous silicone buffer layer 22; wherein the first porous silicone buffer layer 21 is disposed between the first adhesive film layer 31 and the second glass substrate 132, and is used to absorb local pressure differences caused by unevenness of the second glass substrate 132; the second porous silicone buffer layer 22 is disposed between the second adhesive film layer 32 and the transparent substrate 5, and is used to absorb local pressure differences caused by unevenness of the transparent substrate 5; the thickness of the first porous silicone buffer layer 21 and the second porous silicone buffer layer 22 is 0.2-0.5mm, and the porosity is 50%-70%; the first porous silicone buffer layer 21 is close to the second glass substrate 132. The porosity of one side of the glass substrate 132 is at least 20% lower than the porosity of the side away from the second glass substrate 132, and a continuous gradient transition is formed along the side close to the second glass substrate 132 to the other side away from the second glass substrate 132. The porosity of the second porous silicone buffer layer 22 close to the transparent substrate 5 is at least 20% lower than the porosity of the side away from the transparent substrate 5, and a continuous gradient transition is formed along the side close to the transparent substrate 5 to the other side away from the transparent substrate 5. The high-density structure on the low-porosity side of the silicone buffer layer provides more solid material to contact the glass plate, and absorbs local overload stress through the pores in the low-density region. Connecting layers are provided between the first porous silicone buffer layer 21 and the second glass substrate 132, and between the second porous silicone buffer layer 22 and the transparent substrate 5. The thickness of the connecting layers is 0.1μm-10μm, and the material of the connecting layers can be a silane coupling agent or a UV-curable adhesive. The sealing element 14 includes a low-melting-point glass powder sealing layer, which is formed by sintering glass powder with a softening temperature of 360℃-400℃, so that the vacuum degree of the vacuum chamber 11 is maintained at 0.01Pa-10Pa.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application.

[0025] Finally, it is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the principles and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A photovoltaic power generation device with high stability, comprising a photovoltaic power generation module, a support frame, and an electrical connection system, wherein the photovoltaic power generation module is fixedly mounted on the support frame and forms a complete power generation circuit with the electrical connection system; characterized in that, The photovoltaic power generation module includes an asymmetric vacuum glass encapsulation layer, a first encapsulating film layer, a photovoltaic cell layer, a second encapsulating film layer, and a transparent substrate. The photovoltaic cell layer is composed of multiple photovoltaic cell units for photoelectric conversion. The asymmetric vacuum glass encapsulation layer is formed by sealing a first glass substrate on the light-receiving side and a second glass substrate on the backlight side with a sealing element to form a vacuum cavity. A column array is uniformly distributed within the vacuum cavity. The first encapsulating film layer is disposed between the asymmetric vacuum glass encapsulation layer and the photovoltaic cell layer. The transparent substrate is located on the backlight side of the photovoltaic cell layer, and the second encapsulating film layer is disposed between the transparent substrate and the photovoltaic cell layer. The thickness of the first glass substrate is 5mm-8mm, and the thickness of the second glass substrate is 2mm-3mm.

2. The photovoltaic power generation equipment with high stability according to claim 1, characterized in that, The first glass substrate is tempered coated glass, with an anti-reflective coating on the outer surface and a Low-E coating on the inner surface.

3. The photovoltaic power generation equipment with high stability according to claim 1, characterized in that, The first adhesive film layer is an EVA or PVB adhesive film; the second adhesive film layer is an EVA or PVB adhesive film.

4. The photovoltaic power generation equipment with high stability according to claim 1, characterized in that, The photovoltaic cell layer includes multiple thin-film cells, which are interconnected by flexible conductive adhesive.

5. The photovoltaic power generation equipment with high stability according to claim 1, characterized in that, The photovoltaic power generation module further includes a first porous silicone buffer layer and a second porous silicone buffer layer; wherein the first porous silicone buffer layer is disposed between the first adhesive film layer and the second glass substrate, and is used to absorb local pressure differences caused by unevenness of the second glass substrate; the second porous silicone buffer layer is disposed between the second adhesive film layer and the transparent substrate, and is used to absorb local pressure differences caused by unevenness of the transparent substrate.

6. The photovoltaic power generation equipment with high stability according to claim 5, characterized in that, The thickness of both the first porous silicone buffer layer and the second porous silicone buffer layer is 0.2-0.5 mm, and the porosity is 50%-70%.

7. The photovoltaic power generation equipment with high stability according to claim 6, characterized in that, The first porous silicone buffer layer has a porosity at least 20% lower on the side closer to the second glass substrate than on the side farther away, and forms a continuous gradient transition along the side closer to the second glass substrate to the other side farther away from the second glass substrate; the second porous silicone buffer layer has a porosity at least 20% lower on the side closer to the transparent substrate than on the side farther away from the transparent substrate, and forms a continuous gradient transition along the side closer to the transparent substrate to the other side farther away from the transparent substrate.

8. The photovoltaic power generation equipment with high stability according to claim 5, characterized in that, A connecting layer is provided between the first porous silicone buffer layer and the second glass substrate, and between the second porous silicone buffer layer and the transparent substrate, and the thickness of the connecting layer is 0.1μm-10μm.

9. The photovoltaic power generation equipment with high stability according to claim 8, characterized in that, The connecting layer is a silane coupling agent or a UV-curable adhesive.

10. The photovoltaic power generation equipment with high stability according to claim 1, characterized in that, The sealing element includes a low-melting-point glass powder sealing layer, which is formed by sintering glass powder with a softening temperature of 360℃-400℃, so that the vacuum degree of the vacuum chamber is maintained at 0.01Pa-10Pa.

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