Photovoltaic module

Abstract

The utility model relates to a photovoltaic assembly. The photovoltaic assembly comprises a photovoltaic cell; the back plate is arranged on one side of the photovoltaic cell, and a lead-out hole for the electric connecting piece to penetrate through is formed in the back plate; at least part of the sealing element is accommodated in the lead-out hole, and an extension part located on the side, away from the photovoltaic cell, of the back plate is formed on the sealing element; one end of the electric connecting piece is connected with the photovoltaic cell and penetrates through the sealing piece, and the other end of the electric connecting piece is suitable for being connected with a power distribution device. According to the photovoltaic assembly provided by the utility model, at least part of the sealing element is accommodated in the lead-out hole, and the sealing element is provided with the extension part which is located at one side, far away from the photovoltaic cell, of the back plate, so that the thickness of the sealing element is increased, a water vapor invasion path is prolonged, and the service life of the photovoltaic assembly is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially a photovoltaic module. BACKGROUND

[0002] Thin film photovoltaic cell usually encapsulates photovoltaic cell through front plate glass and back plate glass, and the positive and negative poles of the photovoltaic cell are led out from the lead-out hole of the back plate glass through the electric connecting piece (generally busbar), and in order to guarantee the sealing property of the encapsulation space inside the photovoltaic cell module, sealing material needs to be used to fill the hole at the lead-out hole.

[0003] In the related art, the prior art generally uses a high water resistance material sealing piece to fill the back plate hole position, and the height of the sealing piece is limited to the thickness of the back plate, and since the water vapor blocking ability of the sealing piece is proportional to the height of the sealing piece, the height of the sealing piece in the prior art cannot meet the requirements of the photovoltaic module on the water vapor blocking performance, thereby affecting the outdoor service life of the photovoltaic module. SUMMARY

[0004] The utility model discloses at least one of the technical problems in the prior art. To this end, one purpose of the utility model is to provide a photovoltaic module. According to the photovoltaic module of the utility model, at least part of the sealing piece is accommodated in the lead-out hole, and the sealing piece is formed with an extension part on the side of the back plate away from the photovoltaic cell, thereby increasing the thickness of the sealing piece, prolonging the water vapor intrusion path, and improving the service life of the photovoltaic module.

[0005] The photovoltaic module according to the utility model comprises a photovoltaic cell, a back plate arranged on one side of the photovoltaic cell and formed with a lead-out hole for the electric connecting piece to pass through, a sealing piece, at least part of the sealing piece being accommodated in the lead-out hole and the sealing piece being formed with an extension part on the side of the back plate away from the photovoltaic cell, and an electric connecting piece, one end of the electric connecting piece passing through the sealing piece and being electrically connected with the photovoltaic cell, and the other end of the electric connecting piece being adapted to be connected with a power distribution device.

[0006] According to the photovoltaic module of the utility model, at least part of the sealing piece closes the lead-out hole, and at least another part of the sealing piece is formed with an extension part protruding from the side of the back plate away from the photovoltaic cell, the extension part increases the thickness of the sealing piece, prolongs the time for water vapor to intrude into the inside of the photovoltaic module, and improves the service life of the photovoltaic module.

[0007] According to some embodiments of the present invention, the sealing element includes: a sealing portion disposed in the outlet hole and adapted to close the outlet hole; and a protrusion disposed at one end of the sealing portion away from the photovoltaic cell, the protrusion protruding from the surface of the back plate and covering the outer periphery of the outlet hole, the protrusion being configured as the extension portion.

[0008] According to some embodiments of the present invention, the cross-sectional area of ​​the protrusion gradually decreases in the direction from the photovoltaic cell toward the backplate.

[0009] According to some embodiments of this utility model, the diameter of the lead-out hole is d1, the top surface diameter of the protrusion is d2, and the bottom surface diameter of the protrusion is d3, and satisfies: d1≤d2≤d3.

[0010] According to some embodiments of the present invention, at least a portion of the electrical connector is adapted to extend from the top surface or the outer peripheral side of the protrusion.

[0011] According to some embodiments of this utility model, the sealing element is constructed as a water-blocking hot melt adhesive component.

[0012] According to some embodiments of the present invention, the sealing member has a mating hole that is inclinedly disposed on the radially outer side of the photovoltaic cell in the direction of the back plate, and the mating hole is adapted for the electrical connector to pass through.

[0013] According to some embodiments of the present invention, the electrical connector includes: a body section disposed on the photovoltaic cell and parallel to the back plate; an inclined section, one end of which is connected to the body section, at least a portion of which is received within the mating hole and is inclined from the center of the seal to the outer periphery in the direction from the photovoltaic cell toward the back plate, and the other end of which is adapted to connect to a power distribution device.

[0014] According to some embodiments of the present invention, the mating hole is curved in the hole extension direction.

[0015] According to some embodiments of the present invention, the photovoltaic module further includes a protective layer, which is at least disposed on the top surface of the extension portion.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Fig. 1 This is a schematic diagram of the structure of a photovoltaic module according to an embodiment of the present invention;

[0019] Fig. 2 This is a schematic diagram of the structure of a sealing element according to an embodiment of the present invention;

[0020] Fig. 3 This is a schematic diagram of a sealing element disposed on a molding die according to an embodiment of the present invention.

[0021] Figure label:

[0022] 100. Photovoltaic modules;

[0023] 11. Photovoltaic cell; 12. Backsheet; 13. Body section; 14. Inclined section;

[0024] 21. Sealing part; 22. Protrusion; 23. Mating hole;

[0025] 31. Molding mold sleeve; 32. Protective layer. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] Thin-film photovoltaic cells are typically encapsulated by a front glass panel and a back glass panel. The positive and negative terminals of the photovoltaic cells are led out from the lead-out holes of the back glass panel through electrical connectors (usually busbars). In order to ensure the airtightness of the encapsulation space inside the photovoltaic cell module, the lead-out holes need to be sealed with sealing material.

[0028] In related technologies, existing technologies generally use high water-resistant material sealants to fill the mounting holes on the back sheet. The height of the sealant is limited by the thickness of the back sheet. Since the water vapor barrier capability of the sealant is proportional to the height of the sealant, the height of the sealant in the existing technology cannot meet the water vapor barrier performance requirements of photovoltaic modules, thus affecting the outdoor service life of photovoltaic modules.

[0029] The following is for reference. Figs. 1-3 A photovoltaic module according to an embodiment of the present invention is described.

[0030] The photovoltaic module 100 according to the present invention includes: a photovoltaic cell 11, a back sheet 12, a sealing member, and an electrical connector. The back sheet 12 is disposed on one side of the photovoltaic cell 11 and has an outlet hole for the electrical connector to pass through. At least a portion of the sealing member is housed in the outlet hole and has an extension portion on the side of the back sheet 12 opposite to the photovoltaic cell 11. One end of the electrical connector passes through the sealing member and is electrically connected to the photovoltaic cell 11, and the other end of the electrical connector is adapted to connect to a power distribution device.

[0031] In some specific embodiments, the photovoltaic module 100 is composed of a photovoltaic cell 11, a back sheet 12, and an electrical connector. The photovoltaic cell 11 has a back sheet 12 on one side in the thickness direction. The back sheet 12 has an outlet hole, which is suitable for the electrical connector to pass through. At least a portion of a seal is disposed in the outlet hole and closes the outlet hole. The seal has an extension portion protruding from the back sheet 12 away from the photovoltaic cell 11. One end of the electrical connector extends out from the extension portion. The extension portion increases the thickness of the seal, thereby extending the path for water vapor to enter the interior of the photovoltaic module 100, extending the time for water vapor to enter the interior of the photovoltaic module 100, and improving the service life of the photovoltaic module 100. The other end of the electrical connector is connected to a power distribution device, realizing the electrical connection between the photovoltaic module 100 and the power distribution device.

[0032] In some other specific embodiments, during the lamination of the photovoltaic module 100, at least a portion of the outer periphery of the seal is provided with a molding sleeve 31, and the end face of the molding sleeve 31 opposite to the back plate 12 is formed with a pressure-bearing surface. The pressure-bearing surface can withstand the force applied to the photovoltaic module 100 by the laminator, thereby maintaining the predetermined shape of the seal and ensuring good contact and sealing effect between the seal and the back plate 12.

[0033] According to the present invention, the photovoltaic module 100 closes the outlet hole by at least a portion of the sealing member, and an extension portion protruding from the back plate 12 away from the photovoltaic cell 11 is formed on at least another portion of the sealing member. The extension portion increases the thickness of the sealing member, prolongs the time for water vapor to enter the interior of the photovoltaic module 100, and improves the service life of the photovoltaic module 100.

[0034] According to some embodiments of the present invention, the sealing element includes: a sealing portion 21 and a protrusion 22. The sealing portion 21 is disposed in the outlet hole and is adapted to close the outlet hole. The protrusion 22 is disposed at the end of the sealing portion 21 away from the photovoltaic cell 11. The protrusion 22 protrudes from the surface of the back plate 12 and covers the outer periphery of the outlet hole. The protrusion 22 is constructed as an extension portion.

[0035] In some specific embodiments, the seal consists of a plugging part 21 and a protrusion 22. The plugging part 21 fills the outlet hole and seals it to prevent moisture, dust and other impurities from entering the photovoltaic module 100 through the outlet hole. The protrusion 22 is connected to the plugging part 21 and is located at the end of the plugging part 21 away from the photovoltaic cell 11. The protrusion 22 protrudes from the surface of the back plate 12, increasing the thickness of the seal, thereby extending the path of water vapor into the photovoltaic module 100 and extending the time for water vapor to enter the photovoltaic module 100, thus improving the service life of the photovoltaic module 100. The protrusion 22 covers the outer periphery of the outlet hole, preventing water vapor from entering the photovoltaic module 100 from the mating surface of the plugging part 21 and the outlet hole, further improving the sealing effect of the seal.

[0036] According to some embodiments of the present invention, the cross-sectional area of ​​the protrusion 22 gradually decreases in the direction from the photovoltaic cell 11 toward the back plate 12. Preferably, the protrusion 22 can be constructed as a frustum. Since the area of ​​the side of the protrusion 22 closest to the back plate 12 is larger, the contact area between the protrusion 22 and the back plate 12 is increased, making it less likely for the protrusion 22 to shift during the lamination process of the photovoltaic module 100. The pressure can be transmitted to the back plate 12 more evenly and stably from the protrusion 22, reducing the excessive pressure in local positions of the protrusion 22 and avoiding deformation or damage to the protrusion 22 due to uneven force. At the same time, it improves the stability and reliability of the fit between the protrusion 22 and the back plate 12.

[0037] According to some embodiments of the present invention, the diameter of the lead-out hole is d1, the top surface diameter of the protrusion 22 is d2, and the bottom surface diameter of the protrusion 22 is d3, and satisfies: d1≤d2≤d3.

[0038] When d1, d2, and d3 satisfy the above proportional relationship, on the one hand, the bottom surface of the protrusion 22 can completely cover the lead-out hole, and at least part of the protrusion 22 covers the outer periphery of the lead-out hole, so that water vapor cannot enter the photovoltaic module 100 from the mating surface of the sealing part 21 and the lead-out hole. Water vapor can only enter the photovoltaic module 100 from the electrical connector and the protrusion 22, which increases the intrusion path of water vapor, prolongs the intrusion time of water vapor, and improves the service life of the photovoltaic module 100. On the other hand, the bottom surface size of the protrusion 22 is larger than the top surface size of the protrusion 22. When the photovoltaic module 100 is laminated, the force can be distributed to various areas on the protrusion 22, ensuring that the protrusion 22 is pressed tightly on the back sheet 12, which improves the stability and reliability of the bonding between the protrusion 22 and the back sheet 12.

[0039] According to some embodiments of the present invention, at least a portion of the electrical connector is adapted to extend from the top surface or the outer peripheral side of the protrusion 22.

[0040] In some specific embodiments, the electrical connector can be led out from the top surface of the protrusion 22. Leading out the electrical connector from the top surface of the protrusion 22 usually requires a simpler mold design, which simplifies the manufacturing process and reduces production costs. The electrical connector led out from the top surface of the protrusion 22 is more clearly visible, which facilitates the inspection and operation of the electrical connector during installation and maintenance. Leading out the electrical connector from the top surface of the protrusion 22 does not occupy additional side space, making the structure of the photovoltaic module 100 more compact.

[0041] In addition, the electrical connectors leading out from the top of the protrusion 22 are easier to position and fix during the lamination process of the photovoltaic module 100, reducing the complexity of the photovoltaic module 100 lamination process.

[0042] In other embodiments, the electrical connector can be led out from the outer periphery of the protrusion 22. The side-leading design can better utilize the structure of the protrusion 22 to enhance waterproof performance. By wrapping at least a portion of the electrical connector inside the seal, a tighter sealing interface can be formed to prevent moisture and other impurities from entering. At the same time, leading the electrical connector out from the outer periphery of the protrusion 22 can also extend the path length of the electrical connector relative to the seal, thereby increasing the water vapor intrusion path and improving the sealing effect of the photovoltaic module 100.

[0043] According to some embodiments of this utility model, the sealing component is constructed as a water-blocking hot melt adhesive component. The water-blocking hot melt adhesive has excellent waterproof capabilities. The sealing component made of the water-blocking hot melt adhesive can effectively prevent moisture from penetrating into the interior of the photovoltaic module 100, avoiding damage to the photovoltaic cell 11 or causing short circuits due to water vapor. The water-blocking hot melt adhesive also has good weather resistance and can maintain its physical properties under various environmental conditions, including resisting the influence of natural factors such as ultraviolet radiation and extreme temperature changes, so that the photovoltaic module 100 can work stably and reliably in the outdoor environment.

[0044] According to some embodiments of the present invention, a mating hole 23 is formed on the sealing element, which is inclinedly disposed in the direction of the photovoltaic cell 11 toward the back plate 12. The mating hole 23 is suitable for the electrical connector to pass through. The inclined mating hole 23 can increase the contact area between the electrical connector and the sealing element, increase the length of the water vapor intrusion path, prolong the water vapor intrusion time, and improve the sealing performance of the sealing element.

[0045] According to some embodiments of the present invention, the electrical connector includes: a body section 13 and an inclined section 14. The body section 13 is disposed on the photovoltaic cell 11 and is disposed parallel to the back plate 12. One end of the inclined section 14 is connected to the body section 13. At least a portion of the inclined section 14 is received in the mating hole 23 and is inclined from the center of the seal to the outer periphery in the direction from the photovoltaic cell 11 toward the back plate 12. The other end of the inclined section 14 is adapted to connect to a power distribution device.

[0046] In some specific embodiments, the photovoltaic module 100 may be provided with two electrical connectors, namely a positive electrical connector and a negative electrical connector. Each electrical connector consists of a body section 13 and an inclined section 14. The body section 13 is disposed between the back sheet 12 and the photovoltaic cell 11 and is arranged parallel to the back sheet 12. The body section 13 is used to connect to the photovoltaic cell 11. One end of the inclined section 14 is connected to the body section 13, and the other end of the inclined section 14 is adapted to extend out of the extension and connect to the power distribution device, thereby realizing the connection between the photovoltaic cell 11 and the power distribution device. The electrical connection, at least partially accommodating the inclined section 14 within the mating hole 23, is inclined from the center of the seal outwards. The inclined sections 14 of the positive and negative electrical connectors are inclined in opposite directions, increasing the distance between them and reducing electromagnetic interference and electrical noise. The larger distance also reduces the possibility of accidental contact between the positive and negative electrical connectors, thereby lowering the risk of short circuits and ensuring the safety and reliability of the photovoltaic module 100. According to some embodiments of this invention, the mating hole 23 is curved in its extension direction.

[0047] In some specific implementations, when water-blocking hot melt adhesive is poured into the molding sleeve 31, the inclined section 14 of the electrical connector can be zigzag, such as wavy. Then, when the water-blocking hot melt adhesive is poured and molded, a curved mating hole 23 is formed. The curved mating hole 23 can increase the contact area between the electrical connector and the seal, increase the length of the inclined water vapor intrusion path, and thus improve the sealing performance of the seal.

[0048] According to some embodiments of the present invention, the photovoltaic module 100 further includes a protective layer 32, which is disposed at least on the top surface of the extension portion.

[0049] In some specific embodiments, the photovoltaic module 100 is also provided with a protective layer 32, which can be constructed as a release film. The release film is applied to the side of the extension portion away from the back sheet 12. The size of the release film needs to be larger than the top surface size of the extension portion. The release film can completely cover the top surface of the extension portion. When the photovoltaic module 100 is laminated, the release film can prevent the sealant from sticking to the silicone plate of the laminator, thereby ensuring that the sealant itself is not damaged and also ensuring the integrity of the appearance of the sealant after the photovoltaic module 100 is laminated. The release film also has a certain waterproof function, thereby further improving the waterproof performance of the photovoltaic module 100.

[0050] In the description of this utility model, 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", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are 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, and therefore should not be construed as a limitation of this utility model.

[0051] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more.

[0052] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0053] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0054] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of the present invention.

[0055] In this specification, the illustrative expressions of the terms used do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized in that, include: Photovoltaic cells (11); A backplate (12) is disposed on one side of the photovoltaic cell (11) and an outlet hole is formed on the backplate (12) for electrical connectors to pass through. A sealing element, at least a portion of which is received within the outlet hole and an extension is formed on the back plate (12) on the side opposite to the photovoltaic cell (11); An electrical connector, one end of which passes through the seal and is electrically connected to the photovoltaic cell (11), and the other end of which is adapted to connect to a power distribution device; The sealing element has a mating hole (23) that is inclined to the radially outer side of the photovoltaic cell (11) in the direction of the back plate (12), and the mating hole (23) is adapted for the electrical connector to pass through; The electrical connector includes: a body section (13) disposed on the photovoltaic cell (11) and parallel to the back plate (12); an inclined section (14) having one end connected to the body section (13), at least a portion of the inclined section (14) being received in the mating hole (23) and inclined from the center of the seal to the outer periphery in the direction from the photovoltaic cell (11) toward the back plate (12), and the other end of the inclined section (14) being adapted to connect to a power distribution device.

2. The photovoltaic module according to claim 1, characterized in that, The sealing element includes: A sealing part (21) is disposed in the outlet hole and is adapted to close the outlet hole; The protrusion (22) is disposed at one end of the sealing portion (21) away from the photovoltaic cell (11). The protrusion (22) protrudes from the surface of the back plate (12) and covers the outer periphery of the outlet hole. The protrusion (22) is constructed as the extension portion.

3. The photovoltaic module according to claim 2, characterized in that, The cross-sectional area of ​​the protrusion (22) gradually decreases in the direction from the photovoltaic cell (11) toward the back plate (12).

4. The photovoltaic module according to claim 2, characterized in that, The diameter of the outlet hole is d1, the top diameter of the protrusion (22) is d2, and the bottom diameter of the protrusion (22) is d3, and the following conditions are met: d1≤d2≤d3.

5. The photovoltaic module according to claim 2, characterized in that, At least a portion of the electrical connector is adapted to protrude from the top surface or the outer peripheral side of the protrusion (22).

6. The photovoltaic module according to claim 1, characterized in that, The sealing element is constructed as a water-resistant hot melt adhesive component.

7. The photovoltaic module according to claim 1, characterized in that, The mating hole (23) is curved in the hole extension direction.

8. The photovoltaic module according to claim 1, characterized in that, Also includes: A protective layer (32) is provided at least on the top surface of the extension.

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