Shock-resistant photovoltaic module

Abstract

The utility model provides an anti-impact photovoltaic assembly comprising a laminated member which comprises front plate glass, a first packaging adhesive film, a battery pack, a second packaging adhesive film and back plate glass which are arranged in sequence. The battery pack is provided with a plurality of bus bars, the backboard glass is provided with an opening area, a plurality of lead-out holes are formed in the opening area, and the bus bars extend out of the laminated piece through the lead-out holes; each of the first packaging adhesive film and the second packaging adhesive film independently comprises a first adhesive film layer, a reticular fiber layer and a second adhesive film layer which are stacked in sequence; the mesh-shaped fiber layer of the second packaging adhesive film comprises a compact area and a reinforcing area surrounding the periphery of the compact area, the mesh density of the compact area is larger than that of the reinforcing area, and the orthographic projection of the compact area on the backboard glass covers the opening area. The anti-hail assembly has stronger anti-impact capability, so that the anti-hail capability of the assembly is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to photovoltaic technical field relates to an anti-impact photovoltaic module. BACKGROUND

[0002] With the continuous decline of non-renewable resources such as coal, oil and the like, and the increasing demand for energy, developing new energy acquisition methods has become a research hotspot for researchers. Among them, solar energy resources, as the most extensive and environmentally friendly resources, have great development potential.

[0003] In recent years, with the continuous in-depth research and development of photovoltaic modules, considering market demand and economic cost, the thickness and weight of photovoltaic glass are continuously decreasing, but the quality requirements for the modules have not decreased, which brings great challenges to the impact resistance of photovoltaic modules. In addition to the glass factor, the cushioning effect of the adhesive film is also crucial, therefore, improving and optimizing the development of the adhesive film can improve the impact resistance of the module.

[0004] The conventional adhesive film is insufficient in absorbing external force after lamination, when the front of the photovoltaic module is impacted by hail, the force will be transmitted from the front glass to the adhesive film, but due to the limited energy absorption of the adhesive film, more force is transmitted from the adhesive film to the back glass, resulting in the fragmentation of the back glass, and further causing damage to the photovoltaic module.

[0005] Therefore, it is necessary to provide a photovoltaic module with high impact resistance. SUMMARY

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an anti-impact photovoltaic module, by improving the packaging adhesive film, it can absorb more impact force, and play a stronger supporting and protecting role, thereby improving the impact resistance of the photovoltaic module.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] The utility model provides a kind of impact-resistant photovoltaic module, the impact-resistant photovoltaic module includes laminated part, the laminated part includes front plate glass, first encapsulation adhesive film, battery group, second encapsulation adhesive film and back plate glass sequentially arranged;The battery group is provided with several busbars, the back plate glass is provided with opening area, several lead-out holes are arranged in the opening area, and the busbar is stretched out the laminated part by the lead-out hole;The first encapsulation adhesive film and the second encapsulation adhesive film are independently including first adhesive film layer, reticular fiber layer and second adhesive film layer sequentially stacked respectively;The reticular fiber layer of the second encapsulation adhesive film includes dense area, and reinforcing area is surrounded in the periphery of the dense area, the mesh density of the dense area is greater than the mesh density of the reinforcing area, and the orthographic projection of the dense area on the back plate glass covers the opening area.

[0009] The encapsulation adhesive film of the utility model has three-layer composite structure, can absorb impact energy through reticular fiber layer, reduce the force transmission to back plate glass, enhance the mechanical property of photovoltaic module;Meanwhile, the punching position of back plate glass is changed to adapt the size of busbar, reduces the punching area, and further reduces the mechanical loss caused by punching of glass;By improving the local density of reticular fiber layer corresponding to opening area, further improve the mechanical load in the corresponding area, compensate the mechanical strength loss of back plate glass, further strengthen the impact resistance of photovoltaic module.

[0010] As a preferred technical scheme of the utility model, the first adhesive film layer, reticular fiber layer and second adhesive film layer are integrally formed three-layer co-extrusion structure.

[0011] As a preferred technical scheme of the utility model, the mesh density of the dense area is greater than or equal to 2 times of the mesh density of the reinforcing area, for example, can be 2 times, 3 times, 4 times, 5 times or 6 times, etc., but not limited to the listed values.

[0012] In the utility model, the density of the dense area of reticular fiber layer is improved compared with other areas, to compensate the mechanical loss caused by the opening area of back plate glass, to avoid reducing the overall mechanical strength of laminated part.

[0013] As a preferred technical scheme of the utility model, the maximum linear length of the dense area is 15-25mm, for example, can be 15mm, 16mm, 18mm, 20mm, 22mm, 23mm, 24mm or 25mm, but not limited to the listed values, and other unlisted values within the range are also applicable.

[0014] By controlling the size of the dense area within the above range, the utility model avoids the situation that the size of the dense area does not match the size of the opening area, which leads to the dense area not covering the opening area completely, and further weakens the impact resistance of photovoltaic module.

[0015] It should be noted that the maximum linear length of the dense area in the utility model refers to the maximum straight line distance across the dense area.

[0016] As a preferred technical scheme of the utility model, the net fiber layer has the same or different continuous mesh structure.

[0017] The mesh shape of the net fiber layer is linear intersection, circle, ellipse or polygon.

[0018] That is, the shape or size of the mesh in different areas of the net fiber layer in the utility model can be the same or different, and the shape and size can be adjusted according to the density requirement by those skilled in the art.

[0019] As a preferred technical scheme of the utility model, the grammage of the net fiber layer is 0.15-0.25g / m, for example, it can be 0.15g / m, 0.16g / m, 0.17g / m, 0.18g / m, 0.19g / m, 0.2g / m, 0.21g / m, 0.22g / m, 0.23g / m, 0.24g / m or 0.25g / m, but is not limited to the listed values, and other unlisted values within the value range are also applicable.

[0020] It should be noted that the grammage of the net fiber layer in the utility model refers to the grammage of each fiber forming the net fiber layer.

[0021] As a preferred technical scheme of the utility model, the net fiber layer is a glass fiber layer, a carbon fiber layer, a polyester fiber layer, a nylon fiber layer, a flax fiber layer or an aramid fiber layer.

[0022] It should be noted that the above-mentioned fiber layer in the utility model is a material known to those skilled in the art, and a commercially available product can be directly purchased and used.

[0023] As a preferred technical scheme of the utility model, the opening area is located in the middle of the backplane glass.

[0024] The number of the lead-out holes is 3-6, for example, it can be 3, 4, 5 or 6.

[0025] The shape of the lead-out hole is rectangular.

[0026] The length of the lead-out hole is 6-10mm, for example, it can be 6mm, 7mm, 8mm, 9mm or 10mm, but is not limited to the listed values, and other unlisted values within the value range are also applicable.

[0027] The width of the lead-out hole is 1-5 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm or 5 mm, but is not limited to the listed values, and other values not listed in the range are also applicable.

[0028] The lead-out hole formed by punching the back plate glass is rectangular, and the length and width thereof are adapted to the size of the bus bar of the battery pack, so that the punching area can be reduced, and the mechanical loss of the back plate glass is further reduced.

[0029] As a preferred technical solution of the utility model, the glass stress of the front plate glass and the back plate glass is independently > 80Mpa.

[0030] The drop ball height of the front plate glass and the back plate glass is independently > 1.2m.

[0031] It should be noted that the glass stress of the front plate glass in the utility model is > 80Mpa, the drop ball height is > 1.2m, at the same time, the glass stress of the back plate glass is > 80Mpa, the drop ball height is > 1.2m, and the glass stress and the drop ball height of the front plate glass and the back plate glass can be the same or different.

[0032] As a preferred technical solution of the utility model, the outside of the laminated piece is surrounded by a plurality of frames.

[0033] The frame is an aluminum frame, a steel frame or a composite material frame.

[0034] It should be noted that the aluminum frame, the steel frame and the composite material frame in the utility model are frames commonly used by those skilled in the art, which can be directly purchased and modified according to the actual size of the laminated piece.

[0035] Compared with the prior art, the utility model has the beneficial effects that:

[0036] The anti-impact photovoltaic module provided by the utility model is laminated and packaged by using the packaging adhesive film with a three-layer composite structure, can absorb more impact force, and is punched on the back plate glass to adapt to the bus bar, so that the mechanical loss caused by punching can be reduced, the photovoltaic module has high anti-impact ability and anti-hail performance, is beneficial to prolonging the service life of the module and improving the anti-risk ability of the module. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 The structure diagram of the anti-impact photovoltaic module provided by the utility model embodiment 1 is shown.

[0038] Figure 2 The schematic diagram of the opening area of the back plate glass provided by the utility model embodiment 1 is shown.

[0039] Figure 3The drawing provides a schematic view of the hole area of the back plate glass of the embodiment 2.

[0040] 1-front plate glass; 2-first encapsulation adhesive film; 3-battery pack; 4-second encapsulation adhesive film; 5-back plate glass; 51-lead hole. DETAILED DESCRIPTION

[0041] It should be understood that, in the description of the present application, the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0042] It should be noted that, in the description of the present application, unless otherwise specified and limited, the terms "set", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0043] The technical solutions of the present application will be further illustrated below in conjunction with the drawings and through specific embodiments.

[0044] In one specific embodiment, the utility model provides a kind of impact-resistant photovoltaic module, including laminated part, the laminated part includes front plate glass, first encapsulant film, battery group, second encapsulant film and back plate glass sequentially.The battery group is provided with several busbars, the back plate glass is provided with opening area, several lead-out holes are arranged in the opening area, and the busbar is stretched out the laminated part by the lead-out hole.The first encapsulant film and the second encapsulant film are independently including first adhesive film layer, reticular fiber layer and second adhesive film layer sequentially.The reticular fiber layer of the second encapsulant film includes dense area, and reinforcing area is surrounded in the periphery of the dense area, the mesh density of the dense area is greater than the mesh density of the reinforcing area, to improve the structural strength of dense area, and the orthographic projection of the dense area on the back plate glass covers the opening area, improve the mechanical strength of the local area of reticular fiber layer corresponding to opening area, when being impacted by external force, the impact force that the opening area of back plate glass receives is directly transmitted to photovoltaic module inside, to improve the impact resistance of photovoltaic module.

[0045] In some embodiments, the first adhesive film layer, reticular fiber layer and second adhesive film layer are integrally formed three-layer co-extrusion structure.That is, the first encapsulant film and the second encapsulant film are three-layer composite structure combined together by co-extrusion method.The thickness of first encapsulant film and second encapsulant film can be the same or different, and those skilled in the art can adjust according to actual needs.The first adhesive film layer and the second adhesive film layer are made of modified adhesive film material, which is beneficial to enhance the mechanical properties of photovoltaic module.The first adhesive film layer and the second adhesive film layer are prepared by blending base resin and thermoplastic resin by double screw extruder, and then combined with reticular fiber layer, and the mass ratio of base resin and thermoplastic resin is (0.7-0.95):(0.3-0.5).The base resin uses EPE, EVA or POE commonly used in the art, and the thermoplastic resin uses polyvinyl alcohol, polystyrene, polypropylene, polycarbonate, methyl methacrylate or acrylonitrile-butadiene-styrene copolymer commonly used in the art, which are commercially available materials.The material and thickness of the first adhesive film layer and the second adhesive film layer can be the same or different, and those skilled in the art can adjust according to actual needs, which is not limited in the utility model.

[0046] The net fiber layer is a glass fiber layer, a carbon fiber layer, a polyester fiber layer, a nylon fiber layer, a flax fiber layer, or an aramid fiber layer, the gram weight of each fiber of the net fiber layer is 0.15-0.25 g / m, and preferably, carbon fiber is used. The net fiber layer has the same or different continuous mesh structures. The mesh shape of the net fiber layer is linear intersection, circle, ellipse, or polygon, and the polygon includes but is not limited to triangle, edge, hexagon, square, or rectangle. That is, the mesh shape or size of different regions of the net fiber layer in the utility model can be the same or different. Specifically, when the net fiber layer has different mesh shapes, the mesh shape or size of the dense area and the reinforcing area can be the same or different, thereby meeting the requirement that the mesh density of the dense area is greater than or equal to 2 times the mesh density of the reinforcing area. Exemplarily, the mesh shape of the dense area is linear intersection, the mesh shape of the reinforcing area is circle, and the mesh unit area of the dense area is less than that of the reinforcing area; the mesh shape of the dense area is triangle, the mesh shape of the reinforcing area is edge, and the mesh unit area of the dense area is less than that of the reinforcing area; the mesh shape of the dense area and the reinforcing area is ellipse, and the mesh unit area of the dense area is less than that of the reinforcing area.

[0047] The shape of the dense area includes but is not limited to rectangle, circle, or ellipse, and according to the size and shape of the opening area, any other shape that can meet the requirement that the orthographic projection of the dense area on the backplane glass covers the opening area is suitable for the utility model. The maximum linear length of the dense area is 15-25 mm, and based on the shape of the dense area, the maximum linear length can be length distance, diameter distance, or long axis distance.

[0048] The structure of the net fiber layer of the first encapsulation adhesive film and the second encapsulation adhesive film in the utility model can be completely the same or different, that is, the net fiber layer of the first encapsulation adhesive film can adopt a structure with uniform overall density, and the dense area and the reinforcing area are not distinguished, and a person skilled in the art can adjust according to actual conditions.

[0049] In some embodiments, the front plate glass has a smooth surface, and can be transparent conductive glass or super white tempered glass known to those skilled in the art. The glass stress of the front plate glass is > 80 MPa, and the ball drop height is > 1.2 m. The back plate glass has a smooth surface without burrs and other defects, and the opening area is located in the middle of the back plate glass to adapt to the lead-out of the bus bar of the battery pack. The back plate glass can be transparent conductive glass or super white tempered glass known to those skilled in the art. The glass stress of the back plate glass is > 80 MPa, and the ball drop height is > 1.2 m independently. The anti-hail capacity is effectively improved by improving the surface stress and anti-ball capacity of the front plate glass and the back plate glass.

[0050] The number of the lead-out holes is the same as that of the bus bars, the positions of the lead-out holes correspond to the positions of the bus bars, and the shape and size of the lead-out holes match the bus bars, thereby reducing the punching area. Specifically, the number of the lead-out holes in the opening area is 3-6, and the shape of the lead-out hole is rectangular. Further, the length of the lead-out hole is 6-10 mm, and the width of the lead-out hole is 1-5 mm.

[0051] In some embodiments, the outside of the laminated piece is surrounded by several frames, and the frames are connected by rivets, rivet bolts or embedded bolts. The frame has high rigidity and can be an aluminum frame, a steel frame or a composite material frame. The composite material frame can be a carbon fiber composite material frame, a glass fiber composite material frame or a basalt fiber composite material frame known to those skilled in the art.

[0052] The battery pack can be a single battery or a battery matrix composed of multiple batteries in series and / or parallel, and the lead-out bus bar is used for external output of current and can be made of copper or aluminum material.

[0053] The photovoltaic module further comprises a junction box known to those skilled in the art, and the junction box is internally provided with several connection terminals for electrically connecting the lead-out bus bar of the laminated piece. The specific arrangement and structure of the junction box are not limited.

[0054] Embodiment 1

[0055] The embodiment provides an anti-impact photovoltaic module, which comprises a laminated piece, and the outside of the laminated piece is surrounded by multiple aluminum frames. As shown in Figure 1 The laminated piece comprises a front plate glass 1, a first encapsulation adhesive film 2, a battery pack 3, a second encapsulation adhesive film 4 and a back plate glass 5 arranged in sequence. The glass stress of the front plate glass 1 and the back plate glass 5 is > 80 MPa, and the ball drop height is > 1.2 m. The battery pack 3 is provided with six bus bars (not shown in the figure). As Figure 2As shown, the backplate glass 5 has an opening area in the middle, with six rectangular outlet holes 51 within the opening area. Each outlet hole 51 corresponds to a busbar, and the busbars extend from the outlet holes 51. The outlet holes 51 are 8mm long and 2mm wide. The first encapsulating film 2 and the second encapsulating film 4 each independently comprise a first film layer, a mesh fiber layer, and a second film layer stacked sequentially, and the first film layer, mesh fiber layer, and second film layer are integrally formed three-layer co-extruded structures. The mesh fiber layer has a continuous circular mesh structure of the same shape, uses a carbon fiber layer, and the basis weight of each carbon fiber is 0.2g / m. The mesh fiber layers of the first encapsulating film 2 and the second encapsulating film 4 each independently comprise a dense region and a reinforcing region surrounding the dense region. The mesh density of the dense region is three times that of the reinforcing region. The dense area is square and 20mm long. Its orthographic projection on the back glass 5 covers the opening area. By increasing the local density of the mesh fiber layer corresponding to the opening area, the impact resistance of the photovoltaic module is further enhanced.

[0056] Example 2

[0057] This embodiment provides an impact-resistant photovoltaic module, including a laminate with multiple steel frames surrounding it. The laminate includes a front glass panel 1, a first encapsulating film 2, a battery pack 3, a second encapsulating film 4, and a back glass panel 5, arranged sequentially. The glass stress of both the front glass panel 1 and the back glass panel 5 is >80 MPa, and the drop ball height is >1.2 m. The battery pack 3 is provided with six busbars (not shown in the figure). Figure 3 As shown, the backplate glass 5 has an opening area in the middle, with three rectangular outlet holes 51 within the opening area. Each outlet hole 51 corresponds to a busbar, and the busbars extend from the outlet holes 51. The outlet holes 51 are 8mm long and 5mm wide. The first encapsulating film 2 and the second encapsulating film 4 each independently comprise a first film layer, a mesh fiber layer, and a second film layer stacked sequentially. The first film layer, the mesh fiber layer, and the second film layer are integrally formed as a three-layer co-extruded structure. The mesh fiber layer has a continuous circular mesh structure of the same shape, is made of glass fiber, and the basis weight of each glass fiber is 0.22g / m. The mesh fiber layers of the first encapsulating film 2 and the second encapsulating film 4 each independently comprise a dense region and a reinforcing region surrounding the dense region. The mesh density of the dense region is three times that of the reinforcing region. The dense area is circular with a diameter of 18mm. Its orthogonal projection on the back glass 5 covers the opening area. By increasing the local density of the mesh fiber layer corresponding to the opening area, the impact resistance of the photovoltaic module is further enhanced.

[0058] The applicant declares that the above description is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and it should be understood by those skilled in the art that any changes or replacements within the technical scope disclosed by the present application can be easily thought out by any person skilled in the art, and all of them fall within the protection scope and disclosure scope of the present application.

Claims

1. An impact resistant photovoltaic module, characterized by, The anti-impact photovoltaic module comprises a laminate, which comprises a front plate glass, a first encapsulation adhesive film, a cell group, a second encapsulation adhesive film and a back plate glass arranged in sequence. The cell group is provided with a plurality of busbars, the back plate glass is provided with an opening area, a plurality of lead-out holes are formed in the opening area, and the busbars extend out of the laminate through the lead-out holes. The first encapsulation adhesive film and the second encapsulation adhesive film each independently comprise a first adhesive film layer, a reticular fiber layer and a second adhesive film layer stacked in sequence; the reticular fiber layer of the second encapsulation adhesive film comprises a dense area and a reinforcing area surrounding the periphery of the dense area, the reticular fiber layer of the dense area has a higher mesh density than the reticular fiber layer of the reinforcing area, and the orthographic projection of the dense area on the back plate glass covers the opening area.

2. The impact-resistant photovoltaic assembly of claim 1, wherein, The first adhesive film layer, the reticular fiber layer and the second adhesive film layer are integrally formed in a three-layer co-extrusion structure.

3. The impact-resistant photovoltaic assembly of claim 1, wherein, The mesh density of the dense area is greater than or equal to twice the mesh density of the reinforcing area.

4. The impact-resistant photovoltaic assembly of claim 1, wherein, The maximum linear length of the dense area is 15-25 mm.

5. The impact-resistant photovoltaic assembly of claim 1, wherein, The reticular fiber layer has the same or different continuous mesh structures; The mesh shape of the reticular fiber layer is linear intersection, circle, ellipse or polygon.

6. The impact-resistant photovoltaic assembly of claim 1, wherein, The grammage of the reticular fiber layer is 0.15-0.25 g / m.

7. The impact-resistant photovoltaic assembly of claim 1, wherein, The reticular fiber layer is a glass fiber layer, a carbon fiber layer, a polyester fiber layer, a nylon fiber layer, a flax fiber layer or an aramid fiber layer.

8. The impact-resistant photovoltaic assembly of claim 1, wherein, The opening area is located in the middle of the back plate glass. The number of the lead-out holes is 3-6; The shape of the lead-out hole is rectangular; The length of the lead-out hole is 6-10 mm, and the width of the lead-out hole is 1-5 mm.

9. The impact-resistant photovoltaic assembly of claim 1, wherein, The glass stress of the front plate glass and the back plate glass is independently greater than 80 MPa; The drop ball height of the front plate glass and the back plate glass is independently greater than 1.2 m.

10. The impact-resistant photovoltaic assembly of claim 1, wherein, The laminate is surrounded by a plurality of frames on the outside; The frame is an aluminum frame, a steel frame or a composite material frame.

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