Photovoltaic module and junction box structure

Abstract

The utility model discloses a photovoltaic assembly and a junction box structure. The photovoltaic module comprises a module main body, a junction box structure fixed on the back surface of the module main body and a bonding layer, the junction box structure comprises a junction box main body and a sealing element, the sealing element is arranged around a leading-out wire connecting area of the junction box main body, and the lower side of the sealing element is hermetically embedded with the bottom surface of the junction box main body; the upper side of the sealing element is hermetically connected with the back of the assembly body; the bonding layer is arranged on the outer side of the sealing piece, located between the back face of the assembly body and the back face of the junction box structure and fixedly connected with the sealing piece, the back face of the assembly body and the junction box structure. The structure can reduce the risk that water vapor intrudes into the assembly body.

Description

Technical Field

[0001] This utility model relates to a photovoltaic module and junction box structure. Background Technology

[0002] In existing technologies, junction boxes in photovoltaic modules are typically bonded to the back of the module body using adhesive. On one hand, the materials of the adhesive, the module backsheet, and the junction box differ significantly. After the adhesive cures, interfaces exist between the adhesive and the module backsheet, as well as between the adhesive and the junction box surface. As the photovoltaic module ages, moisture can penetrate these interfaces, accelerating adhesive aging, reducing its adhesion, and further increasing the risk of moisture intrusion into the module body. On the other hand, the adhesive and the overflow adhesive around the busbar outlet holes on the module body may not form a good fit (e.g., there are gaps between the adhesive and the overflow adhesive, or the adhesive thickness is less than the overflow adhesive thickness), creating localized penetration channels that further reduce moisture barrier performance and increase the risk of moisture intrusion into the module body. Utility Model Content

[0003] In view of this, the present invention provides a photovoltaic module and junction box structure. Compared with the existing structure that only uses adhesive to fix the junction box body to the module body, the junction box structure of the photovoltaic module provided by the present invention adds a sealing element. The sealing element cooperates with the junction box body and the module body to add a new waterproof structure to the module body and reduce the risk of water vapor entering the module body.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] In a first aspect, this utility model provides a photovoltaic module, comprising: a module body, a junction box structure fixed to the back of the module body, and an adhesive layer.

[0006] The junction box structure includes a junction box body and a sealing element.

[0007] The sealing element is arranged around the lead wire connection area of ​​the junction box body, and the lower side of the sealing element is sealed and fitted with the bottom surface of the junction box body;

[0008] The upper side of the seal is sealed to the back of the main body of the component;

[0009] The adhesive layer is disposed on the outside of the seal and located between the back of the component body and the back of the junction box structure, and is fixedly connected to the seal, the back of the component body and the junction box structure.

[0010] Secondly, this utility model embodiment provides a junction box structure for photovoltaic modules, the junction box structure including a junction box body and a sealing element.

[0011] The sealing element is arranged around the lead wire connection area of ​​the junction box body, and the lower side of the sealing element is sealed and fitted with the bottom surface of the junction box body;

[0012] The upper side of the seal is sealed to the back of the photovoltaic module body.

[0013] The above-mentioned utility model has the following advantages or beneficial effects:

[0014] The photovoltaic module provided in this embodiment of the invention achieves sealing of the lead-out connection area by having a sealing element included in the junction box structure surround the lead-out connection area of ​​the junction box body, with the lower side of the sealing element sealingly fitted to the bottom surface of the junction box body. The upper side of the sealing element is sealed to the back of the module body, thus sealing the busbar lead-out hole. Furthermore, an adhesive layer disposed on the outside of the sealing element to fix the module body and the junction box structure, with the sealing element and adhesive layer working together, significantly reduces the risk of moisture intrusion into the lead-out connection area of ​​the junction box body and the busbar lead-out hole of the module body, thereby improving the moisture resistance and long-term reliability of the photovoltaic module. Attached Figure Description

[0015] Figure 1 This is a cross-sectional schematic diagram showing the relative relationship between the junction box body and the main body of an existing photovoltaic module;

[0016] Figure 2 This is a cross-sectional schematic diagram showing the first relative relationship between the junction box body and the component body according to an embodiment of the present utility model;

[0017] Figure 3 This is a cross-sectional schematic diagram showing a second relative relationship between the junction box body and the component body according to an embodiment of the present utility model;

[0018] Figure 4 This is a cross-sectional schematic diagram showing the third relative relationship between the junction box body and the component body according to an embodiment of the present utility model;

[0019] Figure 5 This is a cross-sectional schematic diagram showing the fourth relative relationship between the junction box body and the component body according to an embodiment of the present utility model;

[0020] Figure 6 This is a schematic diagram of the bottom surface structure of the junction box structure provided according to an embodiment of the present utility model;

[0021] Figure 7This is a cross-sectional schematic diagram of the junction box body in the first relative relationship provided according to the embodiments of the present utility model;

[0022] Figure 8 This is a cross-sectional schematic diagram of the junction box body in the second relative relationship provided according to the embodiments of the present utility model;

[0023] Figure 9 This is a cross-sectional schematic diagram of the junction box body in the third relative relationship provided according to the embodiments of this utility model;

[0024] Figure 10 This is a cross-sectional schematic diagram of the junction box body in the fourth relative relationship provided according to the embodiments of this utility model;

[0025] Figure 11 This is a front view of the sealing element with an integrated frame structure provided according to an embodiment of the present utility model;

[0026] Figure 12 This is a front view of a plate-shaped sealing element provided according to an embodiment of the present utility model;

[0027] Figure 13 This is a cross-sectional schematic diagram showing the relative relationship between the junction box body, the first fitting groove, and the sealing element according to an embodiment of the present utility model.

[0028] Figure 14 This is a cross-sectional schematic diagram showing the relative relationship between the junction box body, the sealing element, and the overflow adhesive provided according to an embodiment of this utility model.

[0029] The attached figures are labeled as follows:

[0030] 10-Component body; 11-Back plate; 12-Second fitting groove; 20-Junction box structure; 21-Junction box body; 211-First fitting groove; 212-Lead wire connection area; 22-Seal; 221-Concave-convex structure; 30-Adhesive layer; 40-Adhesive; 50-Overflow adhesive. Detailed Implementation

[0031] To extract the electrical energy generated within the photovoltaic module and manage the cells of the module in sections via external diodes, through-holes are typically created along the thickness of the module's backsheet. Busbars are then led out through these through-holes and connected to junction boxes with electrode leads or electrically connected to junction boxes with both electrode leads and diodes. Moisture can enter the module through these through-holes on the backsheet, causing corrosion of the cells and a rapid decline in their performance, ultimately leading to a decrease in the overall module performance. Therefore, waterproofing is necessary at the through-hole locations for the busbars (i.e., the locations on the backsheet corresponding to lead-out connection area 212) and at the lead-out connection areas of the junction boxes.

[0032] In existing technologies, such as Figure 1 As shown, in a photovoltaic module, the junction box body 21 is bonded to the perforated area of ​​the module body backplate 10 using adhesive 40, which also blocks moisture. However, on the one hand, the commonly used adhesive 40 has relatively poor water resistance. As the photovoltaic module is used for a longer period, the adhesive ages and becomes less effective at blocking moisture. Using a more waterproof adhesive would increase the cost of the photovoltaic module. On the other hand, there is a significant difference between the materials of the adhesive 40 and the junction box body 21 and the backplate of the module body 21. There will be a clear interface between the adhesive 40 (regardless of its waterproofness) and the junction box body 21, as well as between the adhesive 40 and the back of the module body 10. Even if a waterproof adhesive is used, moisture can still penetrate into the module body through the interface. Furthermore, since the encapsulating adhesive inside the module body 10 generally overflows from the through-holes (i.e., there is generally overflow adhesive 50 in the through-hole area on the back of the module body), the overflow adhesive 50 in the through-hole area has two main effects. First, the outer shape formed by the overflow adhesive 50 is irregular, and there will be unfilled gaps between the irregular shape and the adhesive 40. These unfilled gaps will form local penetration channels, reducing the moisture barrier performance. Second, due to process differences and errors, the amount of overflow adhesive 50 on the back of the module body 10 varies (a larger amount of overflow adhesive 50 on the back of the module body 10 will result in a thicker overflow adhesive 50, while a smaller amount will result in a thinner overflow adhesive 50). For module bodies with a larger amount of overflow adhesive 50, if the amount of adhesive is insufficient (the adhesive thickness is less than the thickness of the overflow adhesive 50), the reliability of the junction box body 21 fixed to the back of the module body 10 will be reduced, thereby increasing the risk of moisture intrusion into the module body 10.

[0033] In order to solve the above-mentioned problems of existing photovoltaic modules, this utility model provides a photovoltaic module and junction box structure.

[0034] The photovoltaic module and junction box structure provided in the embodiments of this utility model will be described in detail below.

[0035] in, Figure 2 This is a cross-sectional schematic diagram showing the first relative relationship between the junction box body and the component body according to an embodiment of the present utility model; Figure 3 This is a cross-sectional schematic diagram showing a second relative relationship between the junction box body and the component body according to an embodiment of the present utility model; Figure 4 This is a cross-sectional schematic diagram showing the third relative relationship between the junction box body and the component body according to an embodiment of the present utility model; Figure 5 This is a cross-sectional schematic diagram showing the fourth relative relationship between the junction box body and the component body according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of the bottom surface structure of the junction box structure provided according to an embodiment of the present utility model; Figure 7 This is a cross-sectional schematic diagram of the junction box body in the first relative relationship provided according to the embodiments of the present utility model; Figure 8 This is a cross-sectional schematic diagram of the junction box body in the second relative relationship provided according to the embodiments of the present utility model; Figure 9 This is a cross-sectional schematic diagram of the junction box body in the third relative relationship provided according to the embodiments of this utility model; Figure 10 This is a cross-sectional schematic diagram of the junction box body in the fourth relative relationship provided according to the embodiments of this utility model; Figure 11 This is a front view of the sealing element with an integrated frame structure provided according to an embodiment of the present utility model; Figure 12 This is a front view of a plate-shaped sealing element provided according to an embodiment of the present utility model; Figure 13 This is a cross-sectional schematic diagram showing the relative relationship between the junction box body, the first fitting groove, and the sealing element according to an embodiment of the present utility model. Figure 14 This is a cross-sectional schematic diagram showing the relative relationship between the junction box body, the sealing element, and the overflow adhesive provided according to an embodiment of this utility model.

[0036] Specifically, such as Figures 2 to 5 As shown, the photovoltaic module provided in this embodiment of the present invention may include: a module body 10, a junction box structure 20 fixed to the back of the module body 10, and an adhesive layer 30.

[0037] Specifically, such as Figures 2 to 14 As shown, the junction box structure 20 may include a junction box body 21 and a seal 22. The seal 22 is arranged around the lead wire connection area 212 of the junction box body 21, and the lower side of the seal 22 is sealed and fitted with the bottom surface of the junction box body 21.

[0038] Furthermore, the upper side of the seal 22 is sealed to the back of the component body 10; the adhesive layer 30 is disposed on the outside of the seal 22 and located between the back of the component body 10 and the back of the junction box structure 20, and is fixedly connected to the seal 22, the back of the component body 10 and the junction box structure 20.

[0039] The sealing connection between the upper side of the seal 22 and the back of the component body 10 is essentially a sealing connection between the upper side of the seal 22 and the back of the back plate of the component body 10.

[0040] Among them, such as Figure 6As shown, the lead wire connection area 212 refers to an open area provided on the back of the junction box body 21. This open area connects to the cavity of the junction box body 21. Generally, a busbar guide groove is provided in this cavity. The busbar led out from the back plate through hole of the component body 10 passes through the open area and the busbar guide groove, and passes through the through hole on the busbar guide groove and the through hole on the electrode plate included in the junction box body 21, so as to weld the led-out busbar to the electrode plate on the front of the junction box body 21.

[0041] It is worth noting that the back side of the main body 10 of the component involved in this utility model refers to the main surface facing away from sunlight during the use of the photovoltaic module.

[0042] The front and bottom surfaces of the junction box body 21 involved in this utility model are two opposing surfaces. Generally, the bottom surface of the junction box body 21 is fixed to the back of the module body 10. Therefore, during the use of the photovoltaic module, the bottom surface of the junction box body 21 faces the back of the module body 10, and the front surface of the junction box body 21 faces away from the back of the module body 10.

[0043] The lower side and upper side of the sealing element 22 involved in this utility model refer to the fact that, during the use of the photovoltaic module, the side of the sealing element 22 facing upward (i.e., the side that is sealed and connected with the module body 10) is the upper side of the sealing element 22, and the side of the sealing element 22 facing downward (i.e., the side that is sealed and fitted with the junction box body 21) is the lower side of the sealing element 22.

[0044] The inner side and outer side of the sealing element 22 involved in this utility model refer to the side closer to the lead wire connection area 212 (or the side farther away from the adhesive layer 30) being the inner side of the sealing element 22 when the sealing element 22 is sealed and fitted with the junction box body 21, and the side farther away from the lead wire connection area 212 (or the side closer to the adhesive layer 30) being the outer side of the sealing element 22.

[0045] For the photovoltaic module provided in this embodiment of the utility model, by having the sealing member 22 included in the junction box structure 20 surround the lead wire connection area 212 of the junction box body 21, and with the lower side of the sealing member 22 sealingly fitted to the bottom surface of the junction box body 21, the lead wire connection area 212 is sealed by the sealing member 22, while the upper side of the sealing member 22 is sealingly connected to the back of the module body 10, thereby sealing the busbar lead hole. Furthermore, by using an adhesive layer 30 disposed on the outside of the sealing member 22 to fix the module body 10 and the junction box structure 20, the sealing member 22 and the adhesive layer 30 cooperate, significantly reducing the risk of moisture intrusion into the lead wire connection area 212 and the busbar lead hole of the junction box body, thereby improving the moisture resistance and long-term reliability of the photovoltaic module.

[0046] In addition, the seal 22 seals the lead wire connection area 212 and the busbar lead hole by sealing and fitting with the bottom surface of the junction box body 21 and sealing and connecting with the back of the component body 10. At the same time, it cooperates with the adhesive layer 30 to improve the stability and reliability of the connection between the junction box body 21 and the component body 10.

[0047] Furthermore, such as Figure 14 As shown, the thickness D1 of the sealant 22 is generally not less than the thickness D3 of the overflow adhesive 50 on the back of the component body 10, which can prevent the overflow adhesive 50 from affecting the sealing connection between the sealant 22 and the back of the component body 10. Furthermore, by setting the sealant 22, the thickness of the adhesive layer 30 can be effectively controlled. Further, before the adhesive layer 30 is sealed to the back of the component body 10, such as... Figure 13 As shown, the thickness D2 of the adhesive layer 30 is not less than the thickness D1 of the sealant 22. That is, before the adhesive layer 30 is sealed to the back of the component body 10, the thickness D1 of the sealant 22 can be used to ensure that the adhesive layer 30 is not less than the thickness D1 of the sealant 22. During the sealing process between the sealant 22 and the back of the component body 10, the adhesive layer 30 is squeezed outwards. After the sealant 22 and the back of the component body 10 are sealed, the thickness of the adhesive layer 30 between the back of the component body 10 and the back of the junction box structure 20 is equal to the distance between the back of the component body 10 and the back of the junction box structure 20. This improves the reliability and stability of the bonding between the adhesive layer 30 and the bottom surface of the junction box body 21 and the back of the component body 10. Specifically, the sealant 22 can be a water-blocking baffle. This water-blocking baffle can better block moisture. The water-blocking baffle can be formed by curing a water-blocking adhesive, or by forming a pre-set metal sheet, or by using other existing deformable materials such as rubber or butyl rubber. More preferably, the seal 22 is an aluminum partition. By selecting an aluminum partition as the seal 22, the weight of the entire junction box structure will not increase significantly, and it will not have a negative impact on the adhesion of the adhesive layer 30. In addition, the aluminum partition has good ductility, which can ensure support while also deforming under low pressure to match the shape change of the outer periphery of the overflow adhesive 50.

[0048] More specifically, water-blocking baffles can have various structures.

[0049] For example, the seal 22 can be Figure 11 The integrated frame structure shown matches the lead wire connection area 212 of the junction box body 21, so that the integrated frame structure can be set around the lead wire connection area 212 of the junction box body 21.

[0050] In addition, water-blocking baffles can also be Figure 10The plate-shaped structure shown can be formed by multiple plate-shaped water-blocking baffles to form a frame structure, thereby surrounding the lead wire connection area 212 of the junction box body 21.

[0051] Preferably, the water-blocking baffle is a multi-directional deformable structure. Specifically, this deformation generally requires external force or compression to form, and the water-blocking baffle retains this deformation after deformation, and can be further deformed by external force or compression again. For example, the junction box body 21 and the component body 10 cooperate to compress the water-blocking baffle, allowing the side of the water-blocking baffle in contact with the junction box body 21 to deform according to the bottom surface area of ​​the junction box body 21, ensuring a sealed fit between the lower side of the seal 22 and the bottom surface of the junction box body 21. Additionally, the side of the water-blocking baffle in contact with the component body 10 can deform according to the back surface area of ​​the component body 10, ensuring a sealed connection between the upper side of the seal 22 and the back surface of the component body 10.

[0052] Furthermore, regarding the sealing element 22 as a water-blocking baffle, based on the multi-directional deformable structure of this water-blocking baffle, such as... Figure 14 As shown, the inner side of the water-blocking baffle abuts against the side of the overflow adhesive 50 on the back of the module body 10, and the deformation shape of the inner side of the water-blocking baffle matches the shape of the side of the overflow adhesive 50 on the back of the module body 10. That is, after the inner side of the water-blocking baffle contacts the side of the overflow adhesive 50 on the back of the module body 10, the inner side of the water-blocking baffle can deform according to the side of the overflow adhesive 50 so that the inner side of the water-blocking baffle fits against the side of the overflow adhesive 50 on the back of the module body 10, avoiding the formation of gaps between the water-blocking baffle (i.e., the seal 22) and the side of the overflow adhesive 50, thereby further reducing the possibility of moisture intrusion and improving the reliability and stability of the connection between the junction box body 21 and the module body 10.

[0053] Furthermore, such as Figure 14 As shown, the outer side of the water-blocking baffle has a concave-convex shape. This effectively increases the contact area between the outer side of the water-blocking baffle and the adhesive layer 30, thereby further improving the reliability of the connection between the junction box body 21 and the component body 10.

[0054] Furthermore, such as Figure 6 As shown, the bottom surface of the junction box body 21 may include a first fitting groove 211 surrounding the lead wire connection area 212; the lower side of the seal 22 is sealed and fitted with the first fitting groove 211. The first fitting groove 211 increases the contact area between the lower side of the seal 22 and the bottom surface of the junction box body 21, thereby improving the stability and reliability of the sealing fit between the lower side of the seal 22 and the bottom surface of the junction box body 21. Furthermore, the lower side of the seal 22 and the bottom surface of the junction box body 21 can be bonded together with adhesive to further improve the stability and reliability of the sealing fit between the lower side of the seal 22 and the bottom surface of the junction box body 21.

[0055] The first fitting groove 211 can have two structures. Specifically, as shown below... Figure 5 and Figure 10 As shown, the first structure of the first fitting groove 211 can be: a through groove structure that extends around the lead wire connection area 212; the second structure of the first fitting groove 211 can be: as shown in the figure. Figures 2 to 4 and 7 to Figure 9 As shown, grooves are arranged around the periphery of the lead-in connection region 212. In some embodiments, the cross-section of the grooves arranged around the periphery of the lead-in connection region 212 can be... Figure 2 and Figure 7 The rectangle shown Figure 3 and Figure 8 The arc or shown Figure 4 and Figure 9 The triangle and other arbitrary shapes shown. More specifically, in the various grooves arranged around the perimeter, adjacent grooves are either closely adjacent or spaced apart.

[0056] In addition, by providing a first fitting groove 211 on the bottom surface of the junction box body 21, the contact area between the bottom surface of the junction box body 21 and the seal 22 can be increased, thereby reducing the interface between the bottom surface of the junction box body 21 and the seal 22 and improving the water vapor barrier capability between the seal 22 and the bottom surface of the junction box body 21.

[0057] Furthermore, regarding the first structure of the first fitting groove 211, that is, the first fitting groove 211 is a through groove structure with its circumferential sides open, and matching it, such as Figure 13 The diagram shows a cross-sectional view of the junction box body 21 and the seal 22 along the S direction (where S refers to the direction from the outer edge of the junction box body 21 to the edge of the open area). The seal 22 has a first protruding structure on its lower side that matches the through-groove structure and is circumferentially continuous. The width K1 of the first protruding structure is less than or equal to the width K2 of the seal 22 body. The width K1 generally refers to the width of the widest part of the seal 22 embedded in the first fitting groove 211. The seal 22 body refers to the structure of the seal 22 located outside the first fitting groove 211, and the width K2 generally refers to the width of the structure of the seal 22 located outside the first fitting groove 211. By abutting the lower side of the seal 22 body against the edge of the first fitting groove 211, the sealing performance of the seal 22 in conjunction with the first fitting groove 211 of the first structure is improved, further reducing the possibility of moisture intrusion into the lead wire connection area 212.

[0058] Furthermore, for the second structure of the first fitting groove 211, where the first fitting groove 211 is a circumferentially arranged groove, the lower side of the seal 22 is provided with a second circumferentially arranged protrusion structure that matches the circumferentially arranged groove. By having the lower side of the seal 22 body abut against the edge of the first fitting groove 211, the sealing performance of the seal 22 in conjunction with the first fitting groove 211 of the second structure is improved, further reducing the possibility of moisture intrusion into the lead wire connection area 212.

[0059] The distance between the first fitting groove 211 and the edge of the open area, the depth of the first fitting groove 211, and the width of the first fitting groove 211 can be determined according to the actual situation. Here, the distance between the first fitting groove 211 and the edge of the open area, the depth of the first fitting groove 211, and the width of the first fitting groove 211 are not limited.

[0060] Furthermore, such as Figure 4 As shown, the back of the module body 10 may include a second fitting groove 12 that matches the upper side of the seal 22; the upper side of the seal 22 is embedded in the second fitting groove 12 and is sealed to the second fitting groove 12. Specifically, for the case where the module body 10 is a double-glass module, the second fitting groove 12 that matches the upper side of the seal 22 can be a pattern on the glass back plate of the double-glass module. Alternatively, the second fitting groove 12 that matches the upper side of the seal 22 can also be a groove structure specially provided on the back plate of the module body 10 corresponding to the lead wire connection area 212. Generally, the depth of the second fitting groove 12 is much smaller than the thickness of the back plate 11 of the module body 10, thereby improving the sealing reliability between the seal 22 and the back plate 11 of the module body 10 while avoiding the risk of fragmentation of the back plate of the module body 10.

[0061] Furthermore, the upper side of the seal 22 includes a third protrusion structure that matches the second fitting groove 12, thereby further improving the reliability of the sealing connection between the back plate of the component body 10 and the upper side of the seal 22.

[0062] Furthermore, the sealing element 22 provided in this embodiment can be formed by curing an adhesive, or by forming a pre-set metal sheet, or by using other existing deformable materials, such as rubber, butyl rubber, etc. More preferably, the sealing element 22 is an aluminum partition. By selecting an aluminum partition as the sealing element 22, the weight of the entire junction box structure will not increase significantly, and it will not have a negative impact on the adhesion of the adhesive layer 30. In addition, the aluminum partition has good ductility, which can ensure support while also deforming under small pressure to match the shape change of the outer periphery of the overflow adhesive 50.

[0063] Furthermore, such as Figures 2 to 14As shown, this embodiment of the present invention also provides a junction box structure 20 for photovoltaic modules. The junction box structure 20 may include a junction box body 21 and a sealing member 22. The sealing member 22 is disposed around the lead wire connection area 212 of the junction box body 21, and the lower side of the sealing member 22 is sealed and fitted with the bottom surface of the junction box body 21; the upper side of the sealing member 22 is sealed and connected to the back of the module body 10 of the photovoltaic module.

[0064] The junction box structure 20 is equipped with a sealing element 22. Through the sealed fit between the junction box body 21 and the sealing element 22, a seal between them is ensured. Furthermore, the upper side of the sealing element 22 is sealed to the back of the photovoltaic module body 10, thus sealing the busbar outlet holes of the module body and adding a new waterproof structure to the module body 10. In the photovoltaic module, this junction box structure 20, in conjunction with the adhesive layer 30, forms a double seal for the lead-out holes of the photovoltaic module, reducing the risk of moisture intrusion into the module body.

[0065] Furthermore, the sealing element 22 in the junction box structure 20 can be a water-blocking baffle. Preferably, the water-blocking baffle is a multi-directional deformable structure. More preferably, the outer side of the water-blocking baffle has a concave-convex shape. The water-blocking baffle can be formed by curing a water-blocking adhesive, or it can be formed by a pre-set metal sheet, or it can be made of other existing deformable materials, such as rubber, butyl rubber, etc. More preferably, the sealing element 22 is an aluminum baffle.

[0066] In this embodiment of the utility model, the bottom surface of the junction box body 21 includes a first fitting groove 211 arranged around the lead wire connection area 212; the lower side of the sealing member 22 is sealed and fitted with the first fitting groove 211.

[0067] Furthermore, such as Figure 5 and Figure 10 As shown, the first fitting groove 211 is a circumferentially through groove structure provided around the lead wire connection area 212; or, Figures 2 to 4 as well as Figures 7 to 9 As shown, the first fitting groove 211 is a groove arranged circumferentially around the lead wire connection area 212.

[0068] Specifically, such as Figure 13 As shown, for the case where the first fitting groove 211 is a through groove structure that extends circumferentially, the lower side of the seal 22 is provided with a first protrusion structure that matches the through groove structure and extends circumferentially. The width K1 of the first protrusion structure is less than or equal to the width K2 of the main body of the seal 22.

[0069] Specifically, for the case where the first fitting groove 211 is a circumferentially arranged groove, such as Figure 11 and Figure 12As shown, the lower side of the seal 22 is provided with a second protrusion structure that matches the grooves arranged around the periphery and is arranged circumferentially.

[0070] The application of the junction box structure 20 on the component body 10 will be described in detail below.

[0071] Specifically, adhesive is applied to the first fitting groove 211 provided around the lead wire connection area 212 of the junction box body 21 (or adhesive can be applied to the underside of the seal 22 of the junction box structure 20), and the underside of the seal 22 of the junction box structure 20 is sealed and fitted with the first fitting groove 211 provided around the lead wire connection area 212 of the junction box body 21. An adhesive layer 30 is applied to the bottom surface of the junction box body 21 outside the seal 22, and the thickness of the adhesive layer 30 is greater than or equal to the thickness of the seal 22. Finally, the upper side of the seal 22 and the adhesive layer 30 applied to the bottom surface of the junction box body 21 are attached to the back of the component body 10, and the upper side of the seal 22 is sealed and connected to the back of the component body 10. Further, during the process of pressing the upper side of the seal 22 to the back of the component body 10, the deformation of the seal 22 causes the inner side of the seal 22 to match and adhere to the outer side of the overflow adhesive 50 on the back of the component body 10.

[0072] The thickness of the adhesive layer 30 is controlled by the thickness of the seal 22, ensuring the adhesion reliability of the formed adhesive layer 30. In addition, the deformation of the seal 22 helps the seal 22 shrink in the thickness direction, preventing the seal 22 from affecting the contact between the adhesive layer 30 and the back of the component body 10, further ensuring the adhesion reliability of the formed adhesive layer 30.

[0073] Example 1

[0074] Use such as Figure 6 The junction box structure 20 shown has a first fitting groove 211 located 3mm around the lead wire connection area 212 of the junction box body 21 (i.e., 3mm from the edge of the opening). This first fitting groove 211 is a through groove structure, and the width of the first fitting groove 211 is ( Figure 13 K3 shown is 2mm, and the width of the main body of seal 22 is ( Figure 13 K2 shown is 4mm, and the thickness of seal 22 is ( Figure 14 As shown, D1) is 4mm. This structure reduces the gaps at the interfaces (between the junction box body 21 and the adhesive layer 30, and between the adhesive layer 30 and the module body 10), improves the moisture barrier capability of the bonding area between the junction box structure 20 and the back of the module body 10, and also increases the adhesive pull of the adhesive layer 30 on the back of the junction box structure 20 and the module body 10, protecting the junction box body 21 from falling off in complex environments, thus comprehensively improving the reliability of the photovoltaic module and extending its service life.

[0075] The above steps are provided only to help understand the method, structure, and core idea of ​​this utility model. For those skilled in the art, various improvements and modifications can be made to this utility model without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this utility model.

Claims

1. A photovoltaic module, characterized in that, include: The component body (10), the junction box structure (20) fixed to the back of the component body (10), and the adhesive layer (30). The junction box structure (20) includes a junction box body (21) and a sealing element (22). The sealing element (22) is provided around the lead wire connection area (212) of the junction box body (21), and the lower side of the sealing element (22) is sealed and fitted with the bottom surface of the junction box body (21); The upper side of the seal (22) is sealed to the back of the component body (10); The adhesive layer (30) is disposed on the outside of the seal (22) and located between the back of the component body (10) and the back of the junction box structure (20), and is fixedly connected to the seal (22), the back of the component body (10) and the junction box structure (20).

2. The photovoltaic module according to claim 1, characterized in that, The sealing element (22) is a water-blocking baffle.

3. The photovoltaic module according to claim 1 or 2, characterized in that, The bottom surface of the junction box body (21) includes a first fitting groove (211) provided around the lead wire connection area (212). The lower side of the seal (22) is sealed and fitted with the first fitting groove (211).

4. The photovoltaic module according to claim 3, characterized in that, The first fitting groove (211) is a through groove structure that extends around the lead wire connection area (212); or, The first fitting groove (211) is a groove arranged around the periphery of the lead wire connection area (212).

5. The photovoltaic module according to claim 4, characterized in that, In the case where the first fitting groove (211) is a through groove structure that extends around the periphery, the lower side of the seal (22) is provided with a first protrusion structure that matches the through groove structure and extends around the periphery. The width of the first protrusion structure is less than or equal to the width of the main body of the seal (22). or, In the case where the first fitting groove (211) is a groove arranged around the periphery, the lower side of the seal (22) is provided with a second protrusion structure that matches the groove arranged around the periphery and is arranged around the periphery.

6. The photovoltaic module according to claim 1 or 2, characterized in that, The back of the component body (10) includes: A second fitting groove (12) that matches the upper side of the seal (22); The upper side of the seal (22) is embedded in the second fitting groove (12) and is sealed to the second fitting groove (12).

7. The photovoltaic module according to claim 6, characterized in that, The upper side of the seal (22) includes a third protrusion structure that matches the second fitting groove (12); And / or, Before the adhesive layer (30) is sealed to the back of the component body (10), the thickness of the adhesive layer (30) is not less than the thickness of the seal (22).

8. The photovoltaic module according to claim 2, characterized in that, The water-blocking baffle is a multi-directional deformable structure.

9. The photovoltaic module according to claim 8, characterized in that, The inner side of the water-blocking baffle abuts against the side of the overflow adhesive (50) on the back of the component body (10), and the deformation shape of the inner side of the water-blocking baffle matches the shape of the side of the overflow adhesive (50) on the back of the component body (10). And / or, The outer side of the water-blocking baffle has a concave-convex shape (221).

10. A junction box structure for use in photovoltaic modules, characterized in that, The junction box structure (20) includes a junction box body (21) and a sealing element (22). The sealing element (22) is provided around the lead wire connection area (212) of the junction box body (21), and the lower side of the sealing element (22) is sealed and fitted with the bottom surface of the junction box body (21); The upper side of the seal (22) is sealed to the back of the main body (10) of the photovoltaic module.

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