Gasket and photovoltaic module

Abstract

The gasket comprises a main body part, the main body part comprises a first surface and a second surface which are oppositely arranged, an installation part is arranged on the first surface, a plurality of containing cavities penetrating in the thickness direction are formed in the installation part, and a plurality of through holes communicated with the containing cavities are formed in the main body part. The orthographic projection area of the installation part on the plane where the first surface is located is located in the first surface. The utility model provides a gasket and a photovoltaic assembly, which can prevent water vapor from invading the interior of the photovoltaic assembly along a direction parallel to a back plate and prevent water vapor from invading the interior of the photovoltaic assembly along a direction vertical to the back plate.

Description

Technical Field

[0001] The utility model belongs to the technical field of solar energy, and in particular relates to a gasket and a photovoltaic component. Background Art

[0002] Heterojunction cells have attracted much attention in the industry because they use better passivation technology, effectively improving the open-circuit voltage and meeting the market demand for high power. However, the grid lines used in this type of cell are mainly composed of pure silver paste. Due to the low total output of silver and the high unit price, the price of heterojunction cells remains high and cannot be used in large quantities. Therefore, the current mainstream method is to replace pure silver paste with silver-copper paste, but this type of silver-copper paste is more sensitive to water vapor. In order to reduce the impact of water vapor on heterojunction cells, waterproof glue such as butyl glue is now filled in the gaps around photovoltaic modules to prevent water vapor intrusion. However, in addition to the problem of water vapor intrusion in the gaps around, the problem of water vapor intrusion in the assembly holes on the backplane for passing through the busbars is also more serious.

[0003] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0004] The utility model aims to provide a gasket and a photovoltaic module, which can prevent the problem of water vapor entering the photovoltaic module through the assembly hole and increase the service life of the photovoltaic module.

[0005] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0006] A gasket comprises a main body, the main body comprises a first surface and a second surface arranged opposite to each other, a mounting portion is provided on the first surface, the mounting portion has a plurality of receiving cavities penetrating along the thickness direction, the main body is provided with a plurality of through holes connected to the receiving cavities, and the orthographic projection area of ​​the mounting portion on the plane where the first surface is located is located inside the first surface.

[0007] In one or more embodiments of the present invention, the through hole includes a first through hole and a second through hole, the mounting portion has a receiving cavity, and the first through hole and the second through hole are both connected to the receiving cavity.

[0008] In one or more embodiments of the present invention, a plurality of sleeves are provided on the second surface, and hollow mounting holes are provided in the sleeves, and the mounting holes are communicated with the through holes.

[0009] In one or more embodiments of the present invention, the through hole includes a first through hole and a second through hole, the mounting portion has a receiving cavity, the sleeve includes a first sleeve and a second sleeve, the first sleeve is provided with a hollow first mounting hole, the second sleeve is provided with a hollow second mounting hole, the first mounting hole, the first through hole, and the receiving cavity are connected, and the second mounting hole, the second through hole, and the receiving cavity are connected.

[0010] In one or more embodiments of the present invention, the height of the sleeve is less than or equal to the shortest distance between the sleeve and the outer wall of the main body.

[0011] In one or more embodiments of the present invention, an isolation layer is provided on the second surface of the main body.

[0012] In one or more embodiments of the present invention, on the plane where the first surface is located, the orthographic projection area of ​​the through hole is located inside the orthographic projection area of ​​the receiving cavity.

[0013] In one or more embodiments of the present invention, the cross-section of the through hole is rectangular or square.

[0014] In one or more embodiments of the present invention, the ratio of the size of the main body to the size of the sealing hole is 1.1 to 1.5; and / or,

[0015] The thickness of the main body is 1 mm to 2 mm; and / or,

[0016] The thickness of the mounting portion is 1 mm to 2 mm; and / or,

[0017] The gasket is a butyl rubber gasket; and / or,

[0018] The gasket is an integrally formed structure.

[0019] Another specific embodiment of the present invention provides a technical solution as follows:

[0020] A photovoltaic module, comprising:

[0021] A back plate, wherein the back plate is provided with an assembly hole along a thickness direction;

[0022] A plurality of battery cells are located on one side of the back plate;

[0023] A plurality of bus bars, wherein the bus bars are electrically connected to the battery cells;

[0024] A plurality of junction boxes are fixedly mounted on the other side of the back plate;

[0025] As in the aforementioned gasket, the mounting portion is sealed and mounted in the assembly hole, the main body is in contact with the back plate, and the bus bar passes through the gasket and is electrically connected to the junction box.

[0026] The utility model provides a gasket and a photovoltaic module. Through the design of the main body and the mounting part, the conventional gasket in the middle and the cylindrical butyl rubber below can be better blocked, so as to better prevent water vapor from invading the interior of the photovoltaic module in a direction parallel to the back plate and prevent water vapor from invading the interior of the photovoltaic module in a direction perpendicular to the back plate; through the design of the sleeve, the bus bar is protected, the bus bar can be prevented from being corroded, the risk of increased resistance is reduced, and the reliability is enhanced;

[0027] Compared with conventional gaskets, the gasket provided by the utility model can achieve better water vapor barrier effect at the same butyl rubber dosage; at the same time, based on the characteristics of butyl rubber itself, it can ensure that the bonding between the gasket and the potting glue in the junction box is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is an EL diagram of a photovoltaic module in the prior art after passing the DH1000 test;

[0030] Figure 2 This is a schematic diagram of the main structure of a gasket in one embodiment of the utility model;

[0031] Figure 3 This is a bottom view structural diagram of a gasket in one embodiment of the utility model;

[0032] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at AA in the middle;

[0033] Figure 5 This is a schematic diagram of a top view of a photovoltaic module in another embodiment of the utility model;

[0034] Figure 6 This is a schematic diagram of a top view of a photovoltaic module without a back plate in another embodiment of the present invention;

[0035] Figure 7 for Figure 5 Schematic diagram of the partial cross-sectional structure at the middle BB. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0039] In the prior art, in order to reduce the possibility of water vapor invading the interior of the photovoltaic module through the back plate assembly hole, a conventional gasket is usually used to cover the assembly hole.

[0040] The photovoltaic modules using conventional gaskets are used for DH1000 test (DH1000 test is also called double 85 test of modules, which requires the modules to be tested for 1000 hours under the conditions of temperature 85%±2% and humidity 85%±5%. The test results require the modules to be in good appearance and the maximum power attenuation <5%), and then the EL graph of the photovoltaic modules after DH1000 test is obtained through non-destructive testing. Figure 1 As shown in the EL diagram, it can be seen that since the gaps around the photovoltaic module are filled with waterproof glue such as butyl glue, there is no obvious blackening around. However, a more serious blackening phenomenon occurs in the middle of the photovoltaic module corresponding to the assembly hole.

[0041] The main reason for this situation is that the conventional gasket is placed between the back film and the backboard. The conventional gasket is usually made of waterproof adhesive materials such as butyl adhesive. Due to the poor fluidity of butyl adhesive, the back film may squeeze the butyl adhesive during lamination, resulting in incomplete bonding between the butyl adhesive and the backboard or the film drilling into the gap between the butyl adhesive and the backboard, thereby forming a water vapor intrusion channel. The existing conventional gasket cannot be tightly sealed with the assembly hole. The inside of the photovoltaic module is filled with potting glue, and the water vapor permeability of the potting glue is high, resulting in water vapor entering the interior of the photovoltaic module through the water vapor intrusion channel and contacting the battery cell more, thereby corroding the grid lines on the battery cell. Therefore, the existing conventional gasket cannot play a good role in blocking water vapor.

[0042] Therefore, in order to solve the above problems, the applicant creatively proposed a gasket and a photovoltaic module.

[0043] The technical solution of the present utility model will be described below in conjunction with the accompanying drawings.

[0044] Reference Figure 2 to Figure 4 As shown, the gasket in one embodiment of the utility model comprises a main body 1, the main body 1 comprises a first surface and a second surface arranged oppositely, a mounting portion 2 is arranged on the first surface, the mounting portion 2 has a plurality of receiving cavities 21 penetrating along the thickness direction, the main body 1 is provided with a plurality of through holes 11 connected to the receiving cavities 21, and the orthographic projection area of ​​the mounting portion 2 on the plane where the first surface is located is located inside the first surface. According to this design, combined with Figure 5 to Figure 7 As shown, when the gasket is applied to a photovoltaic module, the mounting portion 2 of the gasket can be installed in the assembly hole of the back plate 5, and the outer wall of the mounting portion 2 and the inner wall of the assembly hole are tightly fitted to form a seal to prevent water vapor from invading the interior of the photovoltaic module in a direction parallel to the back plate 5. At the same time, by abutting the main body 1 and the back plate 5, a seal is formed between the main body 1 and the outer surface of the back plate 5 to prevent water vapor from invading the interior of the photovoltaic module in a direction perpendicular to the back plate 5. The gasket can have a good effect of blocking water vapor.

[0045] Specifically, the gasket in this embodiment is a butyl rubber gasket or other waterproof rubber gasket. The gasket is an integrally formed structure. Compared with conventional gaskets, under the same butyl rubber dosage, the gasket provided by the utility model can have a better water vapor barrier effect. At the same time, based on the characteristics of butyl rubber itself, it can ensure that the gasket and the potting glue in the junction box 8 are more reliably bonded.

[0046] The thickness of the main body 1 and the mounting part 2 in this embodiment are both 1.5 mm. Of course, the thickness of the main body 1 and the mounting part 2 can also be 1 mm, or 2 mm, or any thickness between 1 mm and 2 mm. The thickness of the main body 1 and the mounting part 2 can be the same or different. Among them, the main body 1 is the most important water-blocking structure. The ratio of the size of the main body 1 to the size of the sealing hole in this embodiment is 1.2; according to this design, after lamination, the main body 1 can be in close contact with the backboard 5, thereby reducing the occurrence of water vapor invading the interior of the photovoltaic module in a direction perpendicular to the backboard 5. Of course, the ratio of the size of the main body 1 to the size of the sealing hole can also be 1.1, or 1.5, or any value between 1.1 and 1.5.

[0047] Optionally, when the gasket in this embodiment is applied to a photovoltaic module, since the junction box 8 is filled with potting silica gel, after water vapor enters the junction box 8 and flows through the potting silica gel, the first thing it contacts is the bus bar 7. Since the bus bar 7 generates heat when collecting current, the water vapor will corrode the bus bar 7 after contacting the bus bar 7, causing the resistance to increase, thereby reducing the overall power of the photovoltaic module. Therefore, referring to Figure 2 to Figure 4 As shown, a plurality of sleeves 3 are provided on the second surface of the embodiment, and a hollow mounting hole is provided in the sleeve 3, which is connected to the through hole 11. According to this design, the busbar 7 can leave enough welding parts, and the rest of the busbar 7 is wrapped by the sleeve 3, which can absorb the invading water vapor, reduce the further intrusion of water vapor, and ensure that the busbar 7 will not be corroded.

[0048] Specifically, when the gasket is applied to a photovoltaic module, since the anode and cathode of the battery cell 6 need to be led out, at least two bus bars 7 are required. Figure 4 As shown, the through hole 11 in this embodiment includes a first through hole 111 and a second through hole 112, and the mounting portion 2 has a receiving cavity 21, and the first through hole 111 and the second through hole 112 are both connected to the receiving cavity 21. Through the design of the first through hole 111 and the second through hole 112, it is convenient to lead the bus bar 7 out from the inside of the photovoltaic module, so as to facilitate electrical connection with the external junction box 8. Preferably, the outer walls of the two different bus bars 7 are tightly fitted with the inner wall of the first through hole 111 and the inner wall of the second through hole 112, respectively, so as to prevent water vapor from invading the interior of the photovoltaic module from the gap between the bus bar 7 and the through hole 11.

[0049] Further, in order to facilitate the packaging of two different bus bars 7 and prevent the bus bars 7 from being corroded by water vapor, refer to Figure 4 As shown, the sleeve 3 in this embodiment includes a first sleeve 31 and a second sleeve 32. The first sleeve 31 is provided with a hollow first mounting hole 311, and the second sleeve 32 is provided with a hollow second mounting hole 312. The first mounting hole 311, the first through hole 111, and the receiving cavity 21 are connected, and the second mounting hole 312, the second through hole 112 and the receiving cavity 21 are connected.

[0050] During the production process, after the parts are assembled, they are put into the laminating machine for lamination. In order to make the sleeve 3 after lamination be located on the main body 1, and to prevent the sleeve 3 from protruding out of the main body 1, which is not conducive to the electrical connection between the bus bar 7 and the junction box 8, refer to Figure 2 As shown, the height of the sleeve 3 in this embodiment is less than or equal to the shortest distance between the sleeve 3 and the outer wall of the main body 1.

[0051] On the basis of conventional components, before entering the laminator, align the busbar 7 hole in the butyl rubber gasket with the busbar 7 and then put it in, and then put a paint cloth in the middle part to prevent the sleeve 3 at the busbar 7 from sticking to the middle conventional gasket during lamination. Figure 4 As shown, in this embodiment, an isolation layer 4 is provided on the second surface of the main body 1. The isolation layer 4 may be a varnished cloth or other structure to prevent the sleeve 3 and the second surface of the main body 1 from adhering.

[0052] Preferably, on the plane where the first surface is located, refer to Figure 3 As shown, the orthographic projection area of ​​the through hole 11 in this embodiment can overlap with the orthographic projection area of ​​the receiving cavity 21, or the orthographic projection area of ​​the through hole 11 can be located inside the orthographic projection area of ​​the receiving cavity 21. Preferably, the mounting portion 2 is in a hollow cylindrical shape, and the outer diameter of the mounting portion 2 is substantially the same as the inner diameter of the assembly hole. After lamination, the mounting portion 2 is bonded to the assembly hole, which increases the area of ​​the bonding surface between the waterproof adhesive and the glass, and reduces the possibility of water vapor invading the interior of the photovoltaic module in a direction parallel to the back plate 5.

[0053] Preferably, refer to Figure 3 As shown, the cross section of the busbar 7 is rectangular, so the cross section of the through hole 11 in this embodiment is rectangular. Of course, the utility model is not limited to this, when the cross section of the busbar 7 is square, the through hole 11 can also be square.

[0054] Reference Figure 5 to Figure 7 As shown, a photovoltaic module in another embodiment of the utility model comprises: a back plate 5, a plurality of cells 6, a plurality of bus bars 7, and a plurality of junction boxes 8; wherein, an assembly hole is provided on the back plate 5 along the thickness direction; a plurality of cells 6 are located on one side of the back plate 5; a plurality of bus bars 7 are electrically connected to the cells 6; a plurality of junction boxes 8 are fixedly installed on the other side of the back plate 5; as the aforementioned gasket, the mounting portion 2 is sealed and installed in the assembly hole, the main body 1 is in contact with the back plate 5, and the bus bar 7 is arranged through the gasket and is electrically connected to the junction box 8. The problem of water vapor entering the photovoltaic module through the assembly hole can be avoided, and the service life of the photovoltaic module can be increased.

[0055] It can be seen from the above technical solutions that the utility model has the following beneficial effects:

[0056] The utility model provides a gasket and a photovoltaic module. Through the design of the main body and the mounting part, the conventional gasket in the middle and the cylindrical butyl rubber below can be better blocked, so as to better prevent water vapor from invading the interior of the photovoltaic module in a direction parallel to the back plate and prevent water vapor from invading the interior of the photovoltaic module in a direction perpendicular to the back plate; through the design of the sleeve, the bus bar is protected, the bus bar can be prevented from being corroded, the risk of increased resistance is reduced, and the reliability is enhanced;

[0057] Compared with conventional gaskets, the gasket provided by the utility model can achieve better water vapor barrier effect at the same butyl rubber dosage; at the same time, based on the characteristics of butyl rubber itself, it can ensure that the bonding between the gasket and the potting glue in the junction box is more reliable.

[0058] In the description of the embodiments of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0060] In the description of the embodiments of the present invention, it is also necessary to explain that the "first", "second", etc. used in this article do not specifically refer to the order or sequence, nor are they used to limit the present case. They are only used to distinguish components or operations described with the same technical terms.

[0061] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0062] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A gasket, characterized in that: The gasket includes a main body, which includes a first surface and a second surface arranged opposite to each other. A mounting portion is provided on the first surface, and the mounting portion has a plurality of receiving cavities penetrating along the thickness direction. The main body is provided with a plurality of through holes connected to the receiving cavities, and the orthographic projection area of ​​the mounting portion on the plane where the first surface is located is located inside the first surface.

2. The gasket according to claim 1, characterized in that The through holes include a first through hole and a second through hole. The mounting portion has a receiving cavity. The first through hole and the second through hole are both connected to the receiving cavity.

3. The gasket according to claim 1, characterized in that A plurality of sleeves are arranged on the second surface, and hollow mounting holes are arranged in the sleeves, and the mounting holes are communicated with the through holes.

4. The gasket according to claim 3, characterized in that The through hole includes a first through hole and a second through hole, the mounting portion has a receiving cavity, the sleeve includes a first sleeve and a second sleeve, the first sleeve is provided with a hollow first mounting hole, the second sleeve is provided with a hollow second mounting hole, the first mounting hole, the first through hole, and the receiving cavity are connected, and the second mounting hole, the second through hole, and the receiving cavity are connected.

5. The gasket according to claim 3, characterized in that The height of the sleeve is less than or equal to the shortest distance between the sleeve and the outer wall of the main body.

6. The gasket according to claim 3, characterized in that An isolation layer is disposed on the second surface of the main body.

7. The gasket according to claim 1, characterized in that On the plane where the first surface is located, the orthographic projection area of ​​the through hole is located inside the orthographic projection area of ​​the receiving cavity.

8. The gasket according to claim 1, characterized in that The cross section of the through hole is rectangular or square.

9. The gasket according to claim 1, characterized in that The ratio of the size of the main body to the size of the sealing hole is 1.1 to 1.5; and / or, The thickness of the main body is 1 mm to 2 mm; and / or, The thickness of the mounting portion is 1 mm to 2 mm; and / or, The gasket is a butyl rubber gasket; and / or, The gasket is an integrally formed structure.

10. A photovoltaic module, characterized in that: The photovoltaic module comprises: A back plate, wherein the back plate is provided with an assembly hole along a thickness direction; A plurality of battery cells are located on one side of the back plate; A plurality of bus bars, wherein the bus bars are electrically connected to the battery cells; A plurality of junction boxes are fixedly mounted on the other side of the back plate; According to any one of claims 1 to 9, the installation portion is sealed and installed in the assembly hole, the main body is in contact with the back plate, and the bus bar passes through the gasket and is electrically connected to the junction box.

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