Laminate unit, photovoltaic module and photovoltaic system

Abstract

This application provides a laminated unit, a photovoltaic module, and a photovoltaic system, belonging to the field of photovoltaic cell technology. The laminated unit includes a laminate body and an insulating adhesive layer. The insulating adhesive layer wraps around the side of the laminate body, extending at both ends to a first target position on the upper surface and a second target position on the lower surface of the laminate body, respectively. The cross-section of the insulating adhesive layer is U-shaped. Compared with existing technologies, the photovoltaic module composed of the laminated unit provided in this application, for the same size photovoltaic module, can reduce the blank area between the solar cells and the side of the laminate body, thus increasing the area of ​​the solar cells and improving the power generation efficiency of the photovoltaic module.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cell technology, and in particular to a laminated unit, a photovoltaic module, and a photovoltaic system. Background Technology

[0002] With the continuous development of photovoltaic cells, the power generation requirements for photovoltaic modules are becoming increasingly higher. For multiple photovoltaic modules of the same size, the larger the silicon wafer area, the higher the power generation efficiency. However, increasing the silicon wafer area leads to a reduction in the creepage distance within the photovoltaic module. With a reduced creepage distance, the reliability of the photovoltaic module becomes difficult to guarantee. Utility Model Content

[0003] This application provides a laminated unit, a photovoltaic module, and a photovoltaic system to solve or alleviate one or more technical problems in the prior art.

[0004] As a first aspect of the embodiments of this application, the embodiments of this application provide a laminate unit, including:

[0005] The laminate body,

[0006] An insulating adhesive layer is wrapped around the side of the laminate body, and its two ends extend to a first target position on the upper surface and a second target position on the lower surface of the laminate body, respectively. The cross-section of the insulating adhesive layer is U-shaped.

[0007] In one embodiment, the distance from the first target position / second target position to the side of the laminate body is 3-10 mm.

[0008] In one embodiment, the insulating adhesive layer is made of at least one of butyl rubber, polytetrafluoroethylene, polyimide, and polyolefin.

[0009] In one embodiment, the thickness of the insulating adhesive layer is 2-6 mm.

[0010] In one embodiment, the laminate body includes a battery cell located on the side opposite to the side of the laminate body at the first target location / second target location.

[0011] In one embodiment, the distance from the edge of the battery cell to the side of the laminate body is 5-8 mm.

[0012] In one embodiment, a pressure-sensitive adhesive is further included, which is coated on the outer layer of the insulating adhesive layer.

[0013] In one embodiment, the pressure-sensitive adhesive is at least one of acrylate type, rubber type, silicone type and polyurethane type.

[0014] As a second aspect of the present application, the present application provides a photovoltaic module, including: a protective profile and a laminate unit of any of the above embodiments; the protective profile at least covers the insulating adhesive layer in the laminate unit.

[0015] In one embodiment, the material of the protective profile includes one of aluminum alloy, stainless steel, polyurethane, polymethyl methacrylate, glass fiber reinforced acrylic resin, EPDM rubber, and silicone rubber.

[0016] As a third aspect of the present application, the present application provides a photovoltaic system including a photovoltaic module from any of the above embodiments.

[0017] Compared with the prior art, the photovoltaic module / photovoltaic system composed of laminated units provided in this application embodiment can reduce the blank area between the cell and the side of the laminated body in the case of photovoltaic module of the same size, that is, increase the area of ​​the cell and thus improve the power generation efficiency of the photovoltaic module.

[0018] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0019] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0020] Figure 1 A schematic diagram of the structure of a laminate unit provided according to an embodiment of this application is shown.

[0021] Figure 2 This diagram illustrates the creepage path of an existing photovoltaic module.

[0022] Figure 3 A schematic diagram showing the creepage path of a photovoltaic module according to an embodiment of this application is shown.

[0023] Figure 4 A schematic diagram of the structure of a photovoltaic module provided according to an embodiment of this application is shown. Detailed Implementation

[0024] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0025] This application provides a laminate unit. Figure 1 A schematic diagram of the structure of a layered body pressing unit according to an embodiment of this application is shown. Figure 1 As shown, the laminate unit includes a laminate body and an insulating adhesive layer 400.

[0026] The laminate body includes a photovoltaic cell, encapsulating glass 300, and encapsulating film 200. The encapsulating glass 300 and encapsulating film 200 encapsulate the photovoltaic cell, enabling it to resist external environmental interference and improving its stability. After lamination, the photovoltaic cell, encapsulating glass 300, and encapsulating film 200 are firmly compressed to form a laminate body with an integral structure. To make the laminate body more robust and suitable for outdoor applications, a protective profile 600, such as an aluminum frame, can be added to the laminate unit to encapsulate its perimeter.

[0027] In this embodiment, the laminate unit can be a single unit between aluminum frames. That is, before adding the protective profile 600, an insulating adhesive layer 400 is added to the laminate body, and then the resulting laminate unit is framed to obtain a photovoltaic module. In this photovoltaic module, the laminate body first contacts the insulating adhesive layer 400, and then the protective profile 600 is encapsulated on the outer layer of the insulating adhesive layer 400.

[0028] The insulating adhesive layer 400 is wrapped around the side of the laminate body, and its two ends extend to the first target position on the upper surface and the second target position on the lower surface of the laminate body, respectively. The cross-section of the insulating adhesive layer 400 is U-shaped.

[0029] In one example, the laminate body is a square structure, which includes four sides, and the insulating adhesive layer 400 wraps around the laminate from the four sides respectively.

[0030] like Figure 2 and Figure 3As shown, taking one side of the laminate body as an example. In the prior art, the side of the laminate body does not have an insulating adhesive layer 400. Therefore, the creepage path of the photovoltaic module is from the edge of the cell 100 to the side of the laminate body. If a longer creepage distance is required, a wider adhesive film needs to be provided on one side of the cell 100, i.e., a wider blank area. A wider blank area leads to an increase in the area of ​​the photovoltaic module; under the condition of a limited or specific size photovoltaic module area, the size of the cell 100 is compressed, affecting the improvement of the photovoltaic module's power generation efficiency.

[0031] In this embodiment of the application, an insulating adhesive layer 400 is wrapped around the side of the laminate body. The insulating adhesive layer 400 is closely attached to the side of the laminate body and the upper and lower surface edges of the laminate body, extending to a first target position in the upper surface of the laminate body and to a second target position in the lower surface of the laminate body.

[0032] In this embodiment of the application, the insulating adhesive layer 400 is specified to extend to a first target position on the upper surface of the laminate body, or to extend to a second target position on the lower surface of the laminate body, indicating that the insulating adhesive layer 400 is wrapped around the laminate body and has a certain width on the upper or lower surface of the laminate body.

[0033] In the laminate unit provided in the embodiments of this application, the creepage path of the photovoltaic module extends from the edge of the cell 100 to the side of the laminate body, that is, the position of the insulating adhesive layer 400, and then turns along the direction of the insulating adhesive layer 400 to the upper surface of the laminate, until the end of the insulating adhesive layer 400.

[0034] In photovoltaic modules, a specific creepage distance is required. If the creepage distance is too short, it can easily cause arcing and other issues, affecting the stability of the photovoltaic module.

[0035] Compared with the prior art, the photovoltaic module composed of laminated units provided in this application embodiment can reduce the blank area between the cell 100 and the side of the laminated body in the case of photovoltaic modules of the same size, that is, increase the area of ​​the cell 100, thereby improving the power generation efficiency of the photovoltaic module.

[0036] In one embodiment, the distance from the first target position / second target position to the side of the laminate body is 3-10 mm.

[0037] The distance between the first target position / second target position and the side edge of the laminate body affects the creepage distance of the solar cell 100. It is known that the wider the distance, the longer the creepage distance. However, if the first target position / second target position extends beyond the edge of the solar cell 100, it will obstruct the solar cell 100 and affect the power generation of the photovoltaic module. Therefore, in this embodiment, the distance between the first target position / second target position and the side edge of the laminate body is limited to 3-10 mm, for example, it can be 3 mm, 4 mm, 5 mm, 6 mm, 6.9 mm, 7.4 mm, 8 mm, 9.3 mm, or 10 mm.

[0038] In one embodiment, the insulating adhesive layer 400 is made of at least one of butyl rubber, polytetrafluoroethylene (PTFE), polyimide (PI), and polyolefin.

[0039] In this embodiment, the insulating adhesive layer 400 is preferably a film material with good insulation performance and / or poor flowability. Good insulation performance ensures that the creepage path of the photovoltaic module is... Figure 3 The path shown is shown. It has poor fluidity, so avoid melting and thinning at high temperatures or during lamination and curing, or mixing with other adhesive films, which could affect its insulation performance.

[0040] In one example, the insulating adhesive layer 400 can be preferably selected with a volume resistivity ≥1×10¹. 6 Adhesive film materials with Ω·cm, breakdown voltage ≥40kV / mm, and CTI value ≥600V.

[0041] In one embodiment, the thickness of the insulating adhesive layer 400 is 2-6 mm. To ensure the insulating performance of the insulating adhesive layer 400, its thickness needs to be maintained. The thickness of the insulating adhesive layer 400 can also be adjusted based on its material. For example, the stronger the insulating performance of the insulating adhesive layer 400, the thinner its thickness can be; if the thermal stability of the insulating adhesive layer 400 is poor, its thickness needs to be slightly thicker, so that even in the event of partial melting, the insulating adhesive layer 400 still has a certain thickness, and the creepage path of the photovoltaic module remains unchanged. Figure 3 The creepage path shown will not end at the side of the laminate body because the insulating adhesive layer 400 melts and mixes with other adhesive films, thus losing its insulating properties.

[0042] In this embodiment, the thickness of the insulating adhesive film layer is limited to 2-6 mm to ensure that the thickness of the insulating adhesive layer 400 is greater than 2 mm, thus guaranteeing its insulation performance. Furthermore, if the thickness of the insulating adhesive layer 400 is too large, it would waste material, increase the weight of the photovoltaic module, and would not provide any further improvement. Therefore, the thickness of the insulating adhesive layer 400 is limited to less than 6 mm. The thickness of the insulating adhesive layer 400 can be, for example, 2 mm, 2.4 mm, 2.5 mm, 3 mm, 3.9 mm, 4.4 mm, 5 mm, 9.3 mm, or 6 mm.

[0043] In one embodiment, the laminate body includes a battery cell 100 located on the side opposite to the side of the laminate body at a first target location / second target location.

[0044] The first / second target positions are located near the side of the laminate body. The insulating adhesive layer 400 at these positions must not obstruct the solar cell 100. At a minimum, it must ensure that the last solar cell 100 closest to the side of the laminate body is not obstructed. The first / second target positions are located on the side of the last solar cell 100 closest to the side of the laminate body. Alternatively, the first / second target positions can be located in the middle between the edge of the last solar cell 100 and the side of the laminate body. This ensures that the insulating adhesive layer 400 does not obstruct the solar cell 100, thus avoiding any impact on the power generation efficiency of the photovoltaic module.

[0045] In one example, in order to avoid the insulating adhesive layer 400 at the first target position / second target position from obstructing the battery cell 100 as much as possible, the distance between the first target position / second target position and the edge of the battery cell 100 can be limited to 1-3mm, for example, it can be 1mm, 1.2mm, 1.5mm, 1.9mm, 2.1mm, 2.4mm, 2.5mm, 2.8mm or 3mm.

[0046] In one embodiment, the distance from the edge of the battery cell 100 to the side of the laminate body is 5-8 mm.

[0047] In this embodiment, by wrapping the sides and upper and lower surface edges of the laminate body with an insulating adhesive layer 400, the gap between the edge of the solar cell 100 and the side of the laminate body can be shortened, so that even with a gap of 5-8mm, a relatively long creepage distance is still maintained. The distance between the edge of the solar cell 100 and the side of the laminate body can be, for example, 5mm, 5.6mm, 5.5mm, 5.9mm, 6.5mm, 6.4mm, 6.5mm, 6.8mm, 7.23mm, or 8mm.

[0048] In one example, the creepage distance requirement for the photovoltaic module is greater than 12mm. If the distance from the edge of the cell 100 to the side of the laminate body is 6mm, the creepage distance below the encapsulation glass 300 is 6mm, and the thickness of the encapsulation glass 300 is 2mm, then the insulating adhesive layer 400 only needs to extend 4mm on the upper or lower surface of the laminate body. At the same time, the distance between the first target position / second target position and the edge of the cell 100 is 1-3mm, that is, the insulating adhesive layer 400 will not obstruct the cell 100.

[0049] In one embodiment, a pressure-sensitive adhesive 500 is further included, which covers the outer layer of the insulating adhesive layer 400. By covering the insulating adhesive layer 400 with the pressure-sensitive adhesive 500, adhesion can be achieved with slight pressure, ensuring a firm bond between the outer protective profile 600 and the insulating adhesive layer 400. With the protective profile 600 firmly fixed to the laminate body, the stability and firmness of the insulating adhesive layer 400 and the laminate body can be further guaranteed.

[0050] In one embodiment, the pressure-sensitive adhesive 500 is at least one of acrylate type, rubber type, silicone type and polyurethane type.

[0051] In one example, the viscosity of pressure-sensitive adhesive 500 can be greater than 800 mPa·s.

[0052] Other configurations of the laminated unit in the above embodiments can be adopted from various technical solutions now and in the future known to those skilled in the art, and will not be described in detail here.

[0053] This application also provides a photovoltaic module, such as... Figure 4 As shown, it includes: a protective profile 600 and a laminate unit in any of the above embodiments; the protective profile 600 at least covers the insulating adhesive layer 400 in the laminate unit.

[0054] The protective profile 600 provides a rigid outer shell for the laminate unit. By injecting adhesive into the protective profile 600 and then securing it to the four sides of the laminate, the protective profile 600 can be securely fitted onto the laminate unit after curing. The protective profile 600 also has a U-shaped cross-section, adhering to and covering the insulating adhesive layer 400 to prevent it from being exposed.

[0055] It is understandable that the first and second target positions in the laminate unit are also adapted to the shape of the protection so that the protective profile 600 can completely cover the insulating adhesive layer 400.

[0056] In one embodiment, the protective profile 600 is made of one of the following materials: aluminum alloy, stainless steel, polyurethane, polymethyl methacrylate, glass fiber reinforced acrylic resin, EPDM rubber, and silicone rubber. The protective profile 600 provides a rigid housing for the photovoltaic module and facilitates installation and fixation in the photovoltaic bracket.

[0057] The following specific embodiments provide a more detailed description of this application, but should not be construed as limiting the application. Any modifications or substitutions made to the methods, steps, or conditions of this application without departing from the spirit and substance of this application are within the scope of this application.

[0058] The following describes how multiple photovoltaic modules were constructed using silicon wafers of different sizes arranged in a 12*11 configuration. All photovoltaic modules have dimensions of 2382*1134mm. The power output of each photovoltaic module was tested, and the test data are shown in Table 1.

[0059] Table 1. Data for multiple photovoltaic modules

[0060]

[0061] Based on the data in Table 1, it can be shown that adding an insulating adhesive layer can reduce the distance from the edge of the solar cell to the side of the laminate body by at least 6.5 mm, and increase the area of ​​the silicon wafer by 1096 mm². 2 The power output of the module can be increased by 12W. Therefore, adding an insulating layer to the side of the laminate body can greatly improve the power generation of the photovoltaic module, contributing to further improvements in the power generation of the photovoltaic module.

[0062] Other components of the photovoltaic modules in the above embodiments can be derived from various technical solutions that are now and will be known to those skilled in the art, and will not be described in detail here.

[0063] This application also provides a photovoltaic system, including the photovoltaic modules in any of the above embodiments. The advantages of the aforementioned photovoltaic modules are also present in this photovoltaic system, and will not be repeated here. The application fields of the aforementioned photovoltaic system are wide, not limited to photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants, but also including various devices and apparatuses that utilize solar energy for power generation, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is to say, the photovoltaic system can be applied in all fields that require solar energy for power generation. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple photovoltaic modules; for example, multiple photovoltaic modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0064] Other components of the photovoltaic system described above can be derived from various technical solutions known now and in the future to those skilled in the art, and will not be described in detail here.

[0065] In the description of this specification, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not 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, they should not be construed as limitations on this application.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0067] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0068] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0069] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0070] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A laminate unit, characterized in that, include: The laminate body, An insulating adhesive layer is wrapped around the side of the laminate body, and its two ends extend to a first target position on the upper surface and a second target position on the lower surface of the laminate body, respectively. The cross-section of the insulating adhesive layer is U-shaped.

2. The laminate unit according to claim 1, characterized in that, The distance from the first target position / second target position to the side of the laminate body is 3-10mm.

3. The laminate unit according to claim 1, characterized in that, The insulating adhesive layer is made of at least one of butyl rubber, polytetrafluoroethylene, polyimide, and polyolefin.

4. The laminate unit according to claim 1, characterized in that, The thickness of the insulating adhesive layer is 2-6 mm.

5. The laminate unit according to claim 1, characterized in that, The laminate body includes a battery cell located on the side opposite to the side of the laminate body at the first target position / second target position.

6. The laminate unit according to claim 5, characterized in that, The distance from the edge of the battery cell to the side of the laminate body is 5-8 mm.

7. The laminate unit according to any one of claims 1 to 6, characterized in that, It also includes a pressure-sensitive adhesive, which is coated on the outer layer of the insulating adhesive layer.

8. The laminate unit according to claim 7, characterized in that, The pressure-sensitive adhesive is at least one of acrylate type, rubber type, silicone type and polyurethane type.

9. A photovoltaic module, characterized in that, include: The protective profile and the laminate unit according to any one of claims 1 to 8; the protective profile at least covers the insulating adhesive layer in the laminate unit.

10. The photovoltaic module according to claim 9, characterized in that, The protective profile is made of one of the following materials: aluminum alloy, stainless steel, polyurethane, polymethyl methacrylate, glass fiber reinforced acrylic resin, EPDM rubber, and silicone rubber.

11. A photovoltaic system, characterized in that, Including the photovoltaic module as described in any one of claims 9 to 10.

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