Photovoltaic junction box and photovoltaic module

Abstract

The embodiment of the present application relates to the photovoltaic field, and provides a photovoltaic junction box and a photovoltaic module, the photovoltaic junction box comprises: a box body; a cover body comprising a first accommodating recess, the cover body is arranged on the box body through the first accommodating recess, at least part of the box body is located in the first accommodating recess, an installation cavity for installing electrical elements is formed around the box body and the cover body, and a mounting gap is formed around the side wall of the first accommodating recess and the box body; a clamping structure is arranged in the mounting gap, and the cover body is clamped and connected with the box body through the clamping structure; a sealing structure is arranged between the bottom wall of the first accommodating recess and the box body, and is used for sealing the gap between the bottom wall and the box body; wherein, the cover body further comprises a liquid discharge port, the mounting gap is communicated with the outside through the liquid discharge port, and the liquid discharge port is used for discharging liquid in the mounting gap to the outside, so as to at least improve the waterproof reliability of the junction box of the photovoltaic module.

Description

Technical Field

[0001] This application relates to the photovoltaic field, and in particular to a photovoltaic junction box and a photovoltaic module. Background Technology

[0002] Currently, with the gradual development of the photovoltaic power generation industry, traditional photovoltaic modules are facing the special environment of being used on water. For photovoltaic modules used on water, the most important performance is waterproof performance, especially the waterproof performance of the photovoltaic junction box as a whole. Once water enters the junction box, it will cause short circuits in the internal electrical components. On the other hand, water may even seep into the entire device through some connecting points inside the junction box, thus causing damage to the entire device.

[0003] In existing technologies, junction boxes in the photovoltaic field typically employ potting compound waterproofing technology. This involves injecting a large amount of potting compound inside the photovoltaic junction box, with all electrical components contained within the potting compound, in order to improve the waterproof reliability of the photovoltaic junction box.

[0004] However, waterproofing with potting compound is not actually suitable for photovoltaic junction boxes used on water. This is mainly because the electronic components inside the potting compound will continuously generate heat, while the water outside the photovoltaic junction box will continuously cool it down. The temperature difference between the two and the repeated hot and cold changes caused by the intermittent power generation of the equipment can easily cause the large volume of potting compound to expand and contract repeatedly, leading to cracks, water ingress, and complete failure of the potting compound. Summary of the Invention

[0005] This application provides a photovoltaic junction box and a photovoltaic module, which at least helps to improve the waterproof reliability of the junction box of the photovoltaic module.

[0006] According to some embodiments of this application, one aspect of this application provides a photovoltaic junction box, including: a box body; a cover body, including a first receiving recess, the cover body covering the box body through the first receiving recess, at least a portion of the box body being located within the first receiving recess, the box body and the cover body surrounding each other to form an installation cavity for installing electrical components, and an installation gap being surrounding the side wall of the first receiving recess and the box body; a snap-fit ​​structure disposed within the installation gap, the cover body being snap-fitted to the box body through the snap-fit ​​structure; a sealing structure disposed between the bottom wall of the first receiving recess and the box body to seal the gap between the two; wherein, the cover body also includes a drain port, the installation gap communicating with the outside through the drain port, the drain port being used to discharge liquid within the installation gap to the outside; the connection between the installation gap and the drain port is located between the snap-fit ​​structure and the sealing structure.

[0007] In some embodiments, the snap-fit ​​structure includes a snap-fit ​​protrusion and a snap-fit ​​recess, one of which is disposed on the housing, and the other of which is disposed on the cover. The snap-fit ​​protrusion extends into the snap-fit ​​recess and engages with the snap-fit ​​recess.

[0008] In some embodiments, there are multiple drain ports, including a first drain port; the cover includes a cover plate and a first surrounding plate disposed on the cover plate, a first receiving recess is formed between the first surrounding plate and the cover plate, and a snap-fit ​​recess is disposed on the first surrounding plate; the snap-fit ​​recess is hole-shaped, and when the snap-fit ​​protrusion extends into the snap-fit ​​recess to engage with the snap-fit ​​recess, the snap-fit ​​protrusion blocks a portion of the snap-fit ​​recess, and the other portion of the snap-fit ​​recess forms the first drain port.

[0009] In some embodiments, the snap-fit ​​recess includes a main body portion and a protrusion portion that are in communication with each other. The protrusion portion is disposed close to the sealing structure relative to the main body portion. The main body portion is used to snap-fit ​​with the snap-fit ​​protrusion portion, and the protrusion portion forms a first drain port.

[0010] In some embodiments, there are multiple snap-fit ​​recesses, which are spaced apart around the first receiving recess. The multiple drain ports also include a second drain port, which is disposed on the first enclosure and located between two adjacent snap-fit ​​recesses.

[0011] In some embodiments, the box body includes a bottom plate and a second surrounding plate disposed on the bottom plate, and the cover further includes an annular limiting structure disposed on the cover plate and located within a first receiving recess; wherein, when the cover plate is placed on the box body, the end of the second surrounding plate away from the bottom plate extends into the first receiving recess, and the first surrounding plate, the second surrounding plate, the annular limiting structure and the cover plate surround to form an annular mounting cavity, which is used for mounting the sealing structure.

[0012] In some embodiments, the sealing structure includes an annular sealing body and an annular sealing protrusion disposed on the annular sealing body, wherein the inner hole of the annular sealing body and the inner hole of the annular sealing protrusion are connected; wherein, when the cover is placed on the box body to compress the sealing structure to cause elastic deformation, the elastic deformation of the annular sealing protrusion is greater than the elastic deformation of the annular sealing body, so as to form a sealing reinforcement between the annular sealing body and the cavity wall of the annular mounting cavity.

[0013] In some embodiments, there are multiple annular sealing protrusions, which are spaced apart around the annular centerline S of the annular sealing body; wherein, there are at least two annular sealing protrusions between the annular sealing body and the second enclosure plate.

[0014] In some embodiments, the housing includes a first mounting recess and a second mounting recess, the second mounting recess communicating with the first mounting recess, and at least a portion of the inner wall of the first receiving recess forming a mounting cavity with the inner wall of the first mounting recess. The photovoltaic junction box further includes a crimping structure, including a second receiving recess, the crimping structure being ultrasonically crimped onto the second mounting recess to seal the gap between the crimping structure and the second mounting recess; wherein a receiving hole is formed between the second mounting recess and the second receiving recess, the receiving hole being used to receive cables of electrical components to form an inlet or outlet terminal on the photovoltaic junction box.

[0015] According to some embodiments of this application, another aspect of this application provides a photovoltaic module, including a photovoltaic power generation device and a photovoltaic junction box. The photovoltaic junction box is disposed on the photovoltaic power generation device, and at least some electrical components of the photovoltaic power generation device are disposed in the mounting cavity of the photovoltaic junction box for electrical connection; wherein, the photovoltaic junction box is the aforementioned photovoltaic junction box.

[0016] The technical solution provided in this application has at least the following advantages:

[0017] In this embodiment of the photovoltaic junction box, the assembly between the box body and the cover is achieved through the snap-fit ​​mechanism of the snap-fit ​​structure. At the same time, the sealing of the mounting cavity is achieved through the sealing structure set at the corresponding position (between the bottom wall of the first receiving recess and the box body). Compared with the method of directly injecting sealant into the mounting cavity for sealing, the sealing structure in this embodiment of the application does not directly contact the electronic components in the mounting cavity, receives less heat (the heat is mainly transferred by the box body), and basically does not cause a decrease in sealing reliability due to thermal expansion and contraction. This initially improves the waterproof reliability of the photovoltaic junction box. Meanwhile, the photovoltaic junction box in this embodiment is also provided with a drain port for draining liquid in the installation gap, so as to avoid liquid remaining in the installation gap due to air pressure, which would cause the sealing structure to age due to long-term water immersion, and the liquid to slowly seep into the installation cavity through the fine gap between the sealing structure and the cover or box body. This not only extends the service life of the sealing structure, but also further improves the waterproof reliability of the photovoltaic junction box. The position setting of the connection between the installation gap and the drain port can further improve the drainage reliability of the drain port, so as to reduce the amount of water entering the installation gap and flowing to the sealing structure, further improving the waterproof reliability of the photovoltaic junction box and extending the service life of the sealing structure. Attached Figure Description

[0018] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the drawings in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this application or in the conventional art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of a photovoltaic junction box;

[0020] Figure 2 This is an exploded view of a photovoltaic junction box according to an embodiment of this application;

[0021] Figure 3 This is a three-dimensional structural diagram of the housing and crimping structure of a photovoltaic junction box according to an embodiment of this application;

[0022] Figure 4 This is a side view of a photovoltaic junction box according to an embodiment of this application;

[0023] Figure 5 This is a cross-sectional view of a photovoltaic junction box according to an embodiment of this application;

[0024] Figure 6 This is a partially enlarged cross-sectional view of a photovoltaic junction box according to an embodiment of this application;

[0025] Figure 7 This is a partial enlarged view of another location in a cross-sectional view of a photovoltaic junction box according to an embodiment of this application;

[0026] Figure 8 This is a three-dimensional structural diagram of a photovoltaic junction box according to another embodiment of this application.

[0027] 1. Electrical components; 101. Cables; 102. Diodes;

[0028] 10. Box body; 11. Base plate; 12. Second enclosure plate; 121. Through hole; 13. First mounting recess; 14. Second mounting recess; 15. Arc-shaped structure;

[0029] 20. Cover; 21. First receiving recess; 22. Mounting cavity; 23. Mounting gap; 24. Drain outlet; 241. First drain outlet; 242. Second drain outlet; 25. Cover plate; 26. First surrounding plate; 261. Guide recess; 262. Mating slope; 27. Annular limiting structure; 28. Annular mounting cavity;

[0030] 30. Snap-fit ​​structure; 31. Snap-fit ​​protrusion; 311. Guide slope; 312. Snap-fit ​​surface; 32. Snap-fit ​​recess; 321. Main body; 322. Protrusion;

[0031] 40. Sealing structure; 41. Annular sealing body; 42. Annular sealing protrusion;

[0032] 50. Press-fit structure; 51. Second receiving recess; 52. Injection hole; 53. Vent hole;

[0033] 60. Receiving hole. Detailed Implementation

[0034] As the background technology shows, the traditional photovoltaic power generation industry typically uses potting compound technology to ensure the waterproof performance of photovoltaic junction boxes for floating photovoltaic modules. This involves filling the junction box with potting compound, sealing the electrical components inside to prevent water from entering and causing short circuits. However, the special operating environment of floating junction boxes causes the external water to continuously cool the junction box and the potting compound inside. The temperature difference between the two and the repeated hot and cold changes caused by the intermittent power generation of the equipment can easily cause the large volume of potting compound to repeatedly expand and contract, leading to cracks, water ingress, and complete failure of the potting compound, seriously affecting the waterproof reliability of the junction box.

[0035] This application provides a photovoltaic junction box and a photovoltaic module, which at least helps to improve the waterproof reliability of the junction box of the photovoltaic module.

[0036] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0039] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0040] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must include a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0041] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0042] In the accompanying drawings corresponding to the embodiments of this application, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0043] In the description of the embodiments of this application, when a component "includes" another component, other components are not excluded unless otherwise stated, and other components may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Moreover, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.

[0044] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "part" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.

[0045] The embodiments of this application will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this application to facilitate a better understanding of the application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0046] Example 1

[0047] See also Figures 1 to 7 As shown, the photovoltaic junction box includes a box body 10, a cover 20, a snap-fit ​​structure 30, and a sealing structure 40. The cover 20 includes a first receiving recess 21, which covers the box body 10. At least a portion of the box body 10 is located within the first receiving recess 21. A mounting cavity 22 for installing electrical components 1 is formed between the box body 10 and the cover 20. A mounting gap 23 is formed between the side wall of the first receiving recess 21 and the box body 10. The snap-fit ​​structure 30 is disposed within the mounting gap 23, and the cover 20 is snap-fitted to the box body 10 through the snap-fit ​​structure 30. The sealing structure 40 is disposed between the bottom wall of the first receiving recess 21 and the box body 10 to seal the gap between them. The cover 20 also includes a drain port 24, through which the mounting gap 23 communicates with the outside, and the drain port 24 is used to discharge liquid within the mounting gap 23 to the outside.

[0048] In this embodiment, the photovoltaic junction box achieves assembly between the box body 10 and the cover 20 through the snap-fit ​​structure 30. At the same time, the sealing structure 40 located at the corresponding position (between the bottom wall of the first receiving recess 21 and the box body 10) seals the mounting cavity 22. Compared with the method of directly injecting sealant into the mounting cavity 22 for sealing, the sealing structure 40 in this embodiment does not directly contact the electrical components 1 in the mounting cavity 22, receives less heat (the heat is mainly transferred by the box body 10), and basically does not cause a decrease in sealing reliability due to thermal expansion and contraction. This initially improves the waterproof reliability of the photovoltaic junction box. Meanwhile, the photovoltaic junction box in this embodiment is also provided with a drain port 24 for draining liquid in the installation gap 23, so as to avoid liquid remaining in the installation gap 23 due to air pressure, which would cause the sealing structure 40 to age due to long-term water immersion, and the liquid to slowly seep into the installation cavity 22 through the fine gap between the sealing structure 40 and the cover 20 or the box body 10. This not only extends the service life of the sealing structure 40, but also further improves the waterproof reliability of the photovoltaic junction box. The position setting of the connection between the installation gap 23 and the drain port 24 can further improve the drainage reliability of the drain port 24, so as to reduce the amount of water entering the installation gap 23 and flowing to the sealing structure 40, further improving the waterproof reliability of the photovoltaic junction box and extending the service life of the sealing structure 40.

[0049] Because the installation gap 23 is small, during operation on water, the photovoltaic junction box located on the photovoltaic module will experience capillary action due to air pressure, drawing water splashed onto the junction box into the installation gap 23, which is difficult to drain. The water (especially seawater) accumulating in the installation gap 23 over a long period will, on the one hand, erode the sealing structure 40, causing it to fail; on the other hand, it will seep into the mounting cavity 22 through the sealing gap of the sealing structure 40, potentially causing a short circuit in the electrical components 1 within the mounting cavity 22. In this embodiment, the drain port 24 connects the installation gap 23 to the atmosphere, thus mitigating capillary action while simultaneously draining water, ensuring that water does not accumulate in the installation gap 23, and completely avoiding the aforementioned problems.

[0050] It should be noted that the bottom of the photovoltaic junction box in this embodiment is also provided with corresponding clearance holes for electrical connection between the electrical component 1 and other electrical structures inside the photovoltaic module. This embodiment is mainly used to ensure the overall sealing reliability of the photovoltaic junction box, that is, to prevent external water from entering the mounting cavity 22. The related design of the sealing performance between the photovoltaic junction box and other electrical structures inside the photovoltaic module is not within the protection scope of this embodiment.

[0051] In one embodiment, both the box body 10 and the cover 20 are rectangular structures, so that the photovoltaic junction box as a whole has a cuboid structure.

[0052] It should be noted that the shape of the photovoltaic junction box is not limited to this and can be adjusted accordingly based on the working conditions and actual usage requirements.

[0053] In one embodiment, the snap-fit ​​structure 30 includes a snap-fit ​​protrusion 31 and a snap-fit ​​recess 32. One of the snap-fit ​​protrusion 31 and the snap-fit ​​recess 32 is disposed on the housing 10, and the other of the snap-fit ​​protrusion 31 and the snap-fit ​​recess 32 is disposed on the cover 20. The snap-fit ​​protrusion 31 extends into the snap-fit ​​recess 32 and engages with it. Thus, while fulfilling the snap-fit ​​function of the snap-fit ​​structure 30, the above-mentioned arrangement also allows for more flexible and diverse placement of the snap-fit ​​protrusion 31 and the snap-fit ​​recess 32 to adapt to different working conditions and usage requirements, thereby improving the processing flexibility of the workers.

[0054] In one embodiment, the snap-fit ​​protrusion 31 is provided on the housing 10, and the snap-fit ​​recess 32 is provided on the cover 20.

[0055] In one embodiment, the snap-fit ​​protrusion 31 is a snap hook, and the snap-fit ​​recess 32 is a hole.

[0056] In other configurations not shown in the accompanying drawings, the snap-fit ​​protrusion 31 is provided on the cover 20, and the snap-fit ​​recess 32 is provided on the box 10.

[0057] The snap-fit ​​structure 30 also enables a detachable connection between the box body 10 and the cover 20, which facilitates the disassembly of the cover 20 by workers to install the electrical component 1. Compared with the traditional potting sealant method, this embodiment achieves the overall sealing of the photovoltaic junction box through the detachable box body 10 / cover 20 and sealing structure 40, which greatly facilitates the installation and subsequent maintenance of the electrical component 1 by workers, thereby reducing the assembly difficulty of workers and the subsequent maintenance cost of the photovoltaic junction box.

[0058] In one embodiment, there are multiple drain ports 24, including a first drain port 241. The cover 20 includes a cover plate 25 and a first surrounding plate 26 disposed on the cover plate 25. A first receiving recess 21 is formed between the first surrounding plate 26 and the cover plate 25, and a snap-fit ​​recess 32 is disposed on the first surrounding plate 26. The snap-fit ​​recess 32 is perforated. When a snap-fit ​​protrusion 31 extends into the snap-fit ​​recess 32 to engage with it, the snap-fit ​​protrusion 31 blocks a portion of the snap-fit ​​recess 32, and the other portion of the snap-fit ​​recess 32 forms the first drain port 241. Thus, the drain port 24 is formed directly through a portion of the snap-fit ​​recess 32, making the formation of the drain port 24 simpler, easier to process and implement, and thus reducing the processing cost of the drain port 24.

[0059] See also Figure 7As shown, a guiding recessed portion 261 is provided on the end surface of the first surrounding plate 26 facing away from the cover plate 25. The guiding recessed portion 261 extends from the aforementioned end surface of the cover plate 25 to the inner wall of the first accommodating recessed portion 21, so that a matching inclined surface 262 is formed by the inner wall of the guiding recessed portion 261. The outer surface of the clamping convex portion 31 (the hook member) is provided with a guiding inclined surface 311 and a clamping surface 312 (flat surface) that are connected to each other, and the guiding inclined surface 311 is matched with the matching inclined surface 262.

[0060] During the covering process of the cover body 20, the clamping convex portion 31 can extend into the guiding recessed portion 261, the guiding inclined surface 311 and the matching inclined surface 262 perform limit stop and slide along the matching inclined surface 262, thereby guiding the first surrounding plate 26 to elastically deform under the action of the matching inclined surface 262, ensuring that the clamping convex portion 31 can be clamped into the corresponding clamping recessed portion 32. When the clamping convex portion 31 is clamped in place, it extends into the clamping recessed portion 32, and limit stop is performed between the clamping surface 312 and the inner wall of the clamping recessed portion 32 to realize clamping. The above arrangement greatly reduces the difficulty of the clamping operation for the staff.

[0061] In one embodiment, the clamping recessed portion 32 includes a main body portion 321 and a protruding portion 322 that communicate with each other. The protruding portion 322 is disposed closer to the sealing structure 40 relative to the main body portion 321. The main body portion 321 is used for clamping and matching with the clamping convex portion 31, and the protruding portion 322 forms a first liquid discharge port 241. In this way, the clamping recessed portion 32 can realize its clamping function through the main body portion 321 on the one hand, and can form the first liquid discharge port 241 through the protruding portion 322 on the other hand, so that the structure of the clamping recessed portion 32 is more compact and reasonable.

[0062] In one embodiment, the clamping recessed portion 32 is a through hole with a "convex" shape structure. The wider part of the through hole is the main body portion 321, which is used for clamping and matching with the clamping convex portion 31, and the narrower upper part of the through hole is the protruding portion 322, which forms the first liquid discharge port 241.

[0063] In one embodiment, the upper inner wall of the protruding portion 322 facing away from the main body portion 321 is an inclined surface, so that the opening area of the end of the protruding portion 322 facing away from the installation gap 23 is larger than the area of the communication position between the protruding portion 322 and the installation gap 23, so as to further improve the drainage reliability of the protruding portion 322.

[0064] In one embodiment, there are multiple snap-fit ​​recesses 32, which are spaced apart around the first receiving recess 21. The multiple drain ports 24 also include second drain ports 242, which are located on the first enclosure 26 and between adjacent snap-fit ​​recesses 32. This arrangement increases the snap-fit ​​area between the box body 10 and the cover 20, thereby improving the assembly reliability between them. Furthermore, the multiple snap-fit ​​recesses 32 also form multiple first drain ports 241, which, together with the second drain ports 242 located between adjacent snap-fit ​​recesses 32 (first drain ports 241), ensure a sufficiently large communication area and range between the installation gap 23 and the outside world. This not only ensures that the water in the installation gap 23 can be drained quickly but also prevents capillary action in the installation gap 23, further improving the overall waterproof performance of the photovoltaic junction box and extending the service life of the sealing structure 40.

[0065] In one embodiment, there are four snap-fit ​​protrusions 31 and four snap-fit ​​recesses 32. The four snap-fit ​​recesses 32 are arranged one-to-one with the four snap-fit ​​protrusions 31 to increase the snap-fit ​​mating area between the box body 10 and the cover body 20, thereby improving the assembly reliability between the box body 10 and the cover body 20.

[0066] Correspondingly, the four snap-fit ​​recesses 32 can form four first drain ports 241.

[0067] In one embodiment, along the width direction of the photovoltaic junction box, two snap-fit ​​recesses 32 are provided on both sides of the photovoltaic junction box (forming two first drain ports 241), and there are two second drain ports 242, with one second drain port 242 provided between the two snap-fit ​​recesses 32 on one side.

[0068] Due to the rectangular shape of the box body 10 and the cover body 20, the installation gap 23 is a narrow rectangular annular gap. By setting four first drain ports 241 in conjunction with two supplementary second drain ports 242, it can be ensured that no local capillary phenomenon occurs in the rectangular annular gap, thereby ensuring that the water in the installation gap 23 can be discharged quickly and efficiently.

[0069] In one embodiment, the housing 10 includes a base plate 11 and a second surrounding plate 12 disposed on the base plate 11. The cover 20 further includes an annular limiting structure 27, which is disposed on the cover plate 25 and located within the first receiving recess 21. When the cover plate 25 is placed on the housing 10, the end of the second surrounding plate 12 away from the base plate 11 extends into the first receiving recess 21. The first surrounding plate 26, the second surrounding plate 12, the annular limiting structure 27, and the cover plate 25 surround each other to form an annular mounting cavity 28, which is used for installing the sealing structure 40. Thus, the above-mentioned arrangement, by fixing and installing the sealing structure 40 through the annular limiting structure 27 to improve the installation stability of the sealing structure 40, also increases the sealing area of ​​the sealing structure 40 through the annular limiting structure 27, thereby improving the sealing reliability of the sealing structure 40.

[0070] During the installation of the cover 20, the second enclosure plate 12 simultaneously compresses and deforms the sealing structure 40. The sealing structure 40 will fit tightly with the end faces of the first enclosure plate 26, the annular limiting structure 27, the cover plate 25, and the second enclosure plate 12 to form a sealing surface, thereby blocking the water in the installation gap 23.

[0071] In one embodiment, the annular limiting structure 27 is a rectangular structure that matches the cover 20.

[0072] In one embodiment, the sealing structure 40 is a sealing ring structure.

[0073] In one embodiment, the sealing structure 40 includes an annular sealing body 41 and an annular sealing protrusion 42 disposed on the annular sealing body 41, wherein the inner hole of the annular sealing body 41 and the inner hole of the annular sealing protrusion 42 are connected. When the cover 20 is placed on the box 10 to compress the sealing structure 40 and cause elastic deformation, the elastic deformation of the annular sealing protrusion 42 is greater than the elastic deformation of the annular sealing body 41, thereby forming a sealing reinforcement between the annular sealing body 41 and the cavity wall of the annular mounting cavity 28. Thus, while forming a large-area sealing surface through the annular sealing body 41 for initial sealing, the annular sealing protrusion 42 on the annular sealing body 41 also forms a sealing reinforcement (sealing surface) with a tighter contact with the cavity wall of the annular mounting cavity 28, further improving the sealing reliability of the sealing structure 40.

[0074] See also Figure 6 As shown, in the cross-section of the sealing structure 40, the annular sealing protrusion 42 protrudes from the annular sealing body 41.

[0075] Understandably, during the installation of the cover 20, the second enclosure plate 12 will compress and deform the sealing structure 40. Compared to the annular sealing protrusion 42 protruding from the annular sealing body 41, the annular sealing protrusion 42 will deform first during the deformation process of the sealing structure 40. In other words, when the cover 20 is in place, the deformation of the annular sealing protrusion 42 will be greater than that of the annular sealing body 41. That is, the contact between the annular sealing protrusion 42 and the cavity wall of the annular mounting cavity 28 is tighter, and the sealing effect is better, so as to form the effect of local reinforced sealing (sealing reinforcement), further improving the sealing reliability of the sealing structure 40.

[0076] In one embodiment, there are multiple annular sealing protrusions 42, which are spaced apart around the annular centerline S of the annular sealing body 41. Specifically, there are at least two annular sealing protrusions 42 between the annular sealing body 41 and the second surrounding plate 12. This arrangement further enhances the sealing reliability of the sealing structure 40 by providing multiple reinforced seals along the shortest liquid permeation path through the multiple annular sealing protrusions 42.

[0077] See also Figure 6 As shown, in the cross-section of the sealing structure 40, six annular sealing protrusions 42 are arranged around the annular sealing body 41 to form six sealing reinforcements on the outer peripheral surface of the annular sealing body 41.

[0078] The gap between the annular sealing body 41 and the second enclosure plate 12 is the shortest path for water to penetrate, meaning that water penetration is easier. Therefore, two annular sealing protrusions 42 are provided between the annular sealing body 41 and the second enclosure plate 12 to form a double-strengthened seal, ensuring that water cannot penetrate into the mounting cavity 22.

[0079] In one embodiment, the housing 10 includes a first mounting recess 13 and a second mounting recess 14, the second mounting recess 14 communicating with the first mounting recess 13. At least a portion of the inner wall of the first receiving recess 21 surrounds the inner wall of the first mounting recess 13 to form a mounting cavity 22. The photovoltaic junction box also includes a crimping structure 50, which includes a second receiving recess 51. The crimping structure 50 is ultrasonically crimped onto the second mounting recess 14 to seal the gap between the crimping structure 50 and the second mounting recess 14. A receiving hole 60 is formed between the second mounting recess 14 and the second receiving recess 51, for accommodating the cable 101 of the electrical component 1, forming an inlet or outlet terminal on the photovoltaic junction box. This configuration allows the photovoltaic junction box to have an inlet / outlet structure design and corresponding inlet / outlet functions. Simultaneously, the crimping structure 50 further crimps and seals the second mounting recess 14 to seal the inlet / outlet position.

[0080] Ultrasonic processing is a type of ultrasonic welding process, which enables the contact position between the pressing structure 50 and the second mounting recess 14 to be fused together, thereby completely eliminating the gap between the pressing structure 50 and the second mounting recess 14 and achieving the corresponding sealing function.

[0081] In one embodiment, the housing 10 further includes an arc-shaped structure 15, which has a second mounting recess 14 disposed on one side of the second enclosure 12 and located on the second enclosure 12. A through hole 121 is provided at the location where the arc-shaped structure 15 is provided on the second enclosure 12. The through hole 121 is used to connect the second mounting recess 14 and the first mounting recess 13, and is also used for the cable 101 to pass through.

[0082] In one embodiment, the arc-shaped structure 15 is generally in the shape of an arc plate, and a second mounting recess 14 is formed between the plate surface and the second surrounding plate 12.

[0083] Electrical component 1 includes cable 101 and diode 102.

[0084] In one embodiment, the bottom wall of the second mounting recess 14 is an arc-shaped surface to accommodate the shape of the cable 101, while the side wall is an inclined surface. The crimping structure 50 is block-shaped, and an arc-shaped recess is provided on the surface opposite to the cable 101 during the crimping process. The arc-shaped recess matches the outer peripheral shape of the cable 101 to accommodate the cable 101. The side of the crimping structure 50 opposite to the side wall of the second mounting recess 14 is an inclined surface that matches the side wall of the second mounting recess 14. During the ultrasonic welding process, the two are fused together. The inclined surface can significantly increase the fusion connection area to improve the sealing performance and the structural strength of the crimping structure 50.

[0085] During the crimping process, the crimping structure 50 can cause the cable 101 to deform so that the bottom wall of the second mounting recess 14 and the arc-shaped recess (accommodation hole 60) fit tightly with the cable 101, thereby achieving a sealing effect.

[0086] Understandably, the above-mentioned setup already ensures a relatively good sealing effect at cable 101. To further ensure the sealing effect, in one embodiment, the crimping structure 50 also includes an injection hole 52 and a vent hole 53 spaced apart. Both the injection hole 52 and the vent hole 53 are connected to the receiving hole 60. The injection hole 52 is used to inject adhesive into the receiving hole 60, and the vent hole 53 is used to allow gas in the receiving hole 60 to be discharged during the adhesive injection process. Thus, after the crimping structure 50 is completed, adhesive can be injected into the receiving hole 60 through the injection hole 52 to further seal the gap between the hole wall of the receiving hole 60 and the cable 101, ensuring the sealing effect at cable 101. At the same time, the vent hole 53 can vent during the adhesive injection process to ensure that the receiving hole 60 is filled with adhesive, further improving the sealing effect at cable 101.

[0087] The colloid injected into the receiving hole 60 can also bond the crimping structure 50, thereby improving the mechanical strength between the crimping structure 50 and the arc structure 15, and can also improve the pull-out resistance of the cable 101.

[0088] This embodiment provides a photovoltaic module, including a photovoltaic power generation device and a photovoltaic junction box. The photovoltaic junction box is disposed on the photovoltaic power generation device, and at least some of the electrical components of the photovoltaic power generation device are disposed within the mounting cavity 22 of the photovoltaic junction box for electrical connection. The photovoltaic junction box is the aforementioned photovoltaic junction box.

[0089] Example 2

[0090] The photovoltaic junction box in Embodiment 2 differs from that in Embodiment 1 in that it does not have a second mounting recess 14 and a crimping structure 50.

[0091] See also Figure 8 As shown, the box body 10 is a cuboid box body, which only has a first mounting recess 13 and does not have a second mounting recess 14 or a pressing structure 50. The second enclosure plate 12 also does not have a through hole 121. The photovoltaic junction box in this embodiment is an intermediate junction box, that is, it does not have an inlet / outlet function. The rest of the structural design, especially the design of the sealing structure 40, is consistent with the photovoltaic junction box with an inlet / outlet design in embodiment one.

[0092] Those skilled in the art will understand that the above embodiments are specific examples of implementing this application, and in practical applications, various changes in form and detail can be made without departing from the spirit and scope of this application. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this application; therefore, the scope of protection of this application should be determined by the scope defined in the claims.

Claims

1. A photovoltaic junction box, characterized in that, include: Box body (10); The cover (20) includes a first receiving recess (21), the cover (20) covering the box body (10) through the first receiving recess (21), at least a portion of the box body (10) being located within the first receiving recess (21), and a mounting cavity (22) for mounting an electrical component (1) being formed between the box body (10) and the cover (20), and a mounting gap (23) being formed between the sidewall of the first receiving recess (21) and the box body (10). The snap-fit ​​structure (30) is provided within the installation gap (23), and the cover (20) is snap-fitted to the box (10) through the snap-fit ​​structure (30); A sealing structure (40) is disposed between the bottom wall of the first receiving recess (21) and the box body (10) to seal the gap between them; The cover (20) further includes a drain port (24), and the installation gap (23) is connected to the outside through the drain port (24). The drain port (24) is used to discharge the liquid in the installation gap (23) to the outside. The connection between the installation gap (23) and the drain port (24) is located between the snap-fit ​​structure (30) and the sealing structure (40); The snap-fit ​​structure (30) includes a snap-fit ​​protrusion (31) and a snap-fit ​​recess (32), wherein the snap-fit ​​protrusion (31) extends into the snap-fit ​​recess (32) and engages with the snap-fit ​​recess (32); There are multiple drain ports (24), and the multiple drain ports (24) include a first drain port (241). The snap-fit ​​recess (32) is hole-shaped. The snap-fit ​​recess (32) includes a main body (321) and a protrusion (322) that are interconnected. The protrusion (322) is disposed close to the sealing structure (40) relative to the main body (321). The main body (321) is used to snap-fit ​​with the snap-fit ​​protrusion (31). The protrusion (322) forms the first drain port (241).

2. The photovoltaic junction box according to claim 1, characterized in that, One of the snap-fit ​​protrusion (31) and the snap-fit ​​recess (32) is disposed on the housing (10), and the other of the snap-fit ​​protrusion (31) and the snap-fit ​​recess (32) is disposed on the cover (20).

3. The photovoltaic junction box according to claim 2, characterized in that, The cover (20) includes a cover plate (25) and a first enclosure plate (26) disposed on the cover plate (25), wherein the first enclosure plate (26) and the cover plate (25) surround to form a first receiving recess (21), and the snap-fit ​​recess (32) is disposed on the first enclosure plate (26).

4. The photovoltaic junction box according to claim 3, characterized in that, There are multiple snap-fit ​​recesses (32), and the multiple snap-fit ​​recesses (32) are arranged at intervals around the first receiving recess (21). The multiple drain ports (24) also include a second drain port (242), which is disposed on the first enclosure plate (26) and located between two adjacent snap-fit ​​recesses (32).

5. The photovoltaic junction box according to claim 3, characterized in that, The box body (10) includes a base plate (11) and a second surrounding plate (12) disposed on the base plate (11), and the cover (20) further includes: A ring-shaped limiting structure (27) is disposed on the cover plate (25) and located within the first receiving recess (21); When the cover plate (25) is placed on the box body (10), the end of the second enclosure plate (12) away from the bottom plate (11) extends into the first receiving recess (21). The first enclosure plate (26), the second enclosure plate (12), the annular limiting structure (27) and the cover plate (25) surround each other to form an annular mounting cavity (28), which is used for the installation of the sealing structure (40).

6. The photovoltaic junction box according to claim 5, characterized in that, The sealing structure (40) includes an annular sealing body (41) and an annular sealing protrusion (42) disposed on the annular sealing body (41), wherein the inner hole of the annular sealing body (41) and the inner hole of the annular sealing protrusion (42) are connected. When the cover (20) is placed on the box (10) to compress the sealing structure (40) and cause elastic deformation, the elastic deformation of the annular sealing protrusion (42) is greater than the elastic deformation of the annular sealing body (41) to form a sealing reinforcement between the annular sealing body (41) and the cavity wall of the annular mounting cavity (28).

7. The photovoltaic junction box according to claim 6, characterized in that, There are multiple annular sealing protrusions (42), and the multiple annular sealing protrusions (42) are arranged at intervals around the annular center line S of the annular sealing body (41); wherein, there are at least two annular sealing protrusions (42) between the annular sealing body (41) and the second enclosure plate (12).

8. The photovoltaic junction box according to claim 1, characterized in that, The housing (10) includes a first mounting recess (13) and a second mounting recess (14), the second mounting recess (14) communicating with the first mounting recess (13), and at least a portion of the inner wall of the first receiving recess (21) surrounding the inner wall of the first mounting recess (13) to form the mounting cavity (22). The photovoltaic junction box further includes: The crimping structure (50) includes a second receiving recess (51), which is ultrasonically crimped onto the second mounting recess (14) to seal the gap between the crimping structure (50) and the second mounting recess (14). Wherein, a receiving hole (60) is formed between the second mounting recess (14) and the second receiving recess (51), the receiving hole (60) being used to receive the cable (101) of the electrical component (1) to form an inlet or outlet on the photovoltaic junction box.

9. A photovoltaic module, characterized in that, The device includes a photovoltaic power generation device and a photovoltaic junction box, wherein the photovoltaic junction box is disposed on the photovoltaic power generation device, and at least some of the electrical components of the photovoltaic power generation device are disposed in the mounting cavity (22) of the photovoltaic junction box for electrical connection; wherein the photovoltaic junction box is the photovoltaic junction box according to any one of claims 1 to 8.

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