Photovoltaic junction box, installation method of photovoltaic junction box and photovoltaic module structure

Abstract

The invention provides a photovoltaic junction box, an installation method of the photovoltaic junction box and a photovoltaic module structure. The photovoltaic junction box comprises a box body, a supporting part with a bayonet, a diode and an electrode lead electrically connected with an electrode of the diode, wherein the electrode lead penetrates through the bayonet and extends to the outside of the box body; and under the condition that the electrode lead is electrically connected with the photovoltaic module, the edge of the bayonet deforms to clamp and fix the electrode lead. According to the photovoltaic junction box disclosed by the invention, the traditional welding process can be avoided, the assembly efficiency of the assembly is improved, meanwhile, the tight attachment between the diode lead and the bus bar is ensured, and the manufacturing cost and the maintenance difficulty are reduced.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, and more specifically, to a photovoltaic junction box, a method for installing the photovoltaic junction box, and a photovoltaic module structure. Background Technology

[0002] With the rapid development of the photovoltaic industry, existing technologies are constantly evolving towards more efficient and faster manufacturing of photovoltaic modules, while also requiring cost control. Currently, the connection between photovoltaic junction boxes and busbars is mainly achieved through welding, requiring specialized photovoltaic junction box welding machines for production. A common photovoltaic junction box structure involves fixing the junction box diodes and electrode plates inside the box. In actual assembly, an external lead wire is first connected to the busbar of the photovoltaic module, then inserted into the photovoltaic junction box, bent to make contact with the electrode plates inside the box, and finally soldered for fixation. However, this welding-dependent connection method not only has high manufacturing costs but also makes maintenance difficult when junction box failures occur in the photovoltaic module within the power station. Summary of the Invention

[0003] In view of this, the present invention provides a photovoltaic junction box, a method for installing the photovoltaic junction box, and a photovoltaic module structure. The connection between the photovoltaic junction box and the photovoltaic module can omit the busbar lead wire, avoiding traditional welding processes, thereby reducing the manufacturing cost of the photovoltaic junction box. The present invention achieves electrical connection between the diode leads extended from the photovoltaic junction box and the busbar, and the bayonet-locking structure makes disassembly and assembly easier. During later maintenance, no destructive disassembly with special tools is required. Compared to the maintenance of traditional welded points, which requires desoldering and resoldering, the maintenance process of the photovoltaic junction box provided by the present invention is more convenient. Furthermore, through the bayonet structure design, the lead wire is limited and automatically locked during diode pressing, ensuring a stable and tight contact between the lead wire and the busbar, thereby effectively improving the reliability of the electrical connection.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] In a first aspect, the present invention provides a photovoltaic junction box, comprising: a box body, a support portion having a bayonet, a diode, and electrode leads electrically connected to the diode electrodes.

[0006] The aforementioned electrode leads extend through the aforementioned bayonet to the outside of the aforementioned housing;

[0007] When the aforementioned electrode leads are electrically connected to the photovoltaic module, the aforementioned bayonet edge deformation clamps and fixes the aforementioned electrode leads.

[0008] In a second aspect, the present invention provides a photovoltaic module structure in which a photovoltaic module is installed in a photovoltaic junction box provided in the first aspect embodiment, comprising:

[0009] The electrode leads of the aforementioned photovoltaic junction box are electrically connected to the busbars inside the photovoltaic module.

[0010] Thirdly, embodiments of the present invention provide an installation method for the photovoltaic junction box provided in the first aspect embodiment above, comprising:

[0011] Step 1: Apply adhesive to the bottom of the box and apply conductive adhesive to the flattened lead electrode ends;

[0012] Step 2: Align the photovoltaic junction box with the reserved area on the photovoltaic module, so that the flattened pins are aligned with the lead holes corresponding to the busbars inside the photovoltaic module;

[0013] Step 3: After the adhesive has cured, apply pressure to the diode toward the photovoltaic module to move the diode's electrode lead downward and cause the bayonet to deform radially, so that the bayonet is engaged with the outer wall of the electrode lead groove, and the end of the electrode lead is pressed against the busbar in the photovoltaic module to form an electrical connection, and the photovoltaic junction box is fixed to the photovoltaic module.

[0014] The technical solution of the first aspect of the above invention has the following advantages or beneficial effects:

[0015] The photovoltaic junction box provided in this invention, by setting a support part with a bayonet, causes the diode electrode lead to deform and self-lock during the insertion process, eliminating the need for busbar leads and avoiding the complex processes of traditional welding connections, thereby reducing the manufacturing cost of the photovoltaic junction box. This bayonet mechanically limits and stably presses the diode electrode lead during the pressing process, ensuring a tight fit between the lead end and the busbar of the photovoltaic module, guaranteeing a low-impedance, reliable electrical connection path between the contact surfaces. In this structure, the applied conductive adhesive, combined with mechanical pressure, forms uniform contact, further improving conductivity stability and avoiding poor contact problems caused by welding defects or thermal stress. The lead-limiting and automatic locking during diode pressing makes this locking structure easier to disassemble and assemble. During later maintenance, no destructive disassembly with special tools is required. Compared to the maintenance of traditional welded joints, which requires desoldering and resoldering, the photovoltaic junction box provided in this invention offers a more convenient maintenance process. Attached Figure Description

[0016] Figure 1 A top view of a photovoltaic junction box provided in an embodiment of the present invention is shown;

[0017] Figure 2A front sectional view of a photovoltaic junction box provided in an embodiment of the present invention is shown;

[0018] Figure 3 An enlarged top view of the heat sink provided in an embodiment of the present invention is shown;

[0019] Figure 4 A perspective view of a photovoltaic module structure provided in an embodiment of the present invention is shown;

[0020] Figure 5 A front sectional view of a photovoltaic junction box installed on a photovoltaic module, according to an embodiment of the present invention, is shown.

[0021] Figure 6 A flowchart illustrating an installation method for a photovoltaic junction box according to an embodiment of the present invention is shown.

[0022] The attached figures are labeled as follows:

[0023] 1-Box body; 2-Support part; 21-Bayonet; 22-Fixing post; 23-Heat sink; 231-First heat sink; 232-Second heat sink; 24-Fixing mounting hole; 3-Diode; 31-Electrode lead; 311-Lead groove; 312-Flattened pin. Detailed Implementation

[0024] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of the present invention, including various details to aid understanding. These details should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0025] This invention improves the structure of the photovoltaic junction box, such as... Figures 1 to 5As shown, a support portion 2 with a bayonet 21 is provided. During the installation of the photovoltaic junction box, when the electrode lead 31 of the diode 3 is inserted downwards, the bayonet 21 undergoes radial elastic deformation under the push of the electrode lead, and automatically recovers after insertion to hold the lead, achieving mechanical self-locking fixation. Since this structure can reliably connect the lead to the busbar in the photovoltaic module without soldering, it eliminates the need for multiple steps involved in traditional soldering processes, such as heating, solder coating, and contact time control, simplifying the module assembly process. In addition, the bayonet structure, while limiting the lead, combined with the assembly pressure applied to the diode body, ensures that the end of the lead can stably fit against the busbar. With the conductive adhesive pre-coated at the end of the lead, a large contact area can be formed under pressure, thereby ensuring good conductivity and low contact resistance at the contact interface, reducing the risk of electrical connection failure due to poor contact or stress migration. The above structure does not require additional soldering equipment or soldering materials, reducing equipment dependence and material consumption in the manufacturing process, and helping to reduce overall manufacturing costs. Meanwhile, the assembly process mainly involves structural insertion and bayonet positioning, which is simple, easy to operate, and improves assembly efficiency. This also helps to simplify subsequent maintenance operations and ensure reliability.

[0026] An embodiment of the present invention provides a photovoltaic junction box, comprising: a box body 1, a support part 2 with a bayonet 21, a diode 3, and an electrode lead 31 electrically connected to the electrode of the diode 3.

[0027] Since the technical solution provided by the embodiments of the present invention mainly improves the fixing method of the electrode lead 31 and the bayonet 21 in the photovoltaic junction box, the accompanying drawings of the embodiments of the present invention mainly involve the electrode lead 31, diode 3, bayonet 21, and support part 2 disposed on heat sink 23. The drawings do not specifically depict the connection details of other parts of the photovoltaic module, such as the backplate and busbars. However, those skilled in the art can clearly understand the electrical connection path and functional configuration between the photovoltaic junction box and the photovoltaic module based on the structural features provided by the embodiments of the present invention. Specifically, as shown... Figures 1 to 5 As shown, the photovoltaic junction box provided in this embodiment includes a box body 1, a support part 2, a diode 3, and electrode leads 31 connected to its electrodes.

[0028] like Figure 2As shown, the support part 2 has a bayonet 21. The electrode lead 31 passes through the bayonet 21 and extends to the outside of the housing 1. When the electrode lead 31 is electrically connected to the photovoltaic module, the edge of the bayonet 21 deforms to lock and fix the electrode lead 31. In actual installation, the electrode lead 31 cooperates with the bayonet to support the diode 3. When the diode 3 is subjected to pressure, it causes the electrode lead 31 to shift, and the edge structure of the bayonet 21 will deform under force, thereby tightly locking the electrode lead 31 to achieve fixation. After the electrode lead 31 is electrically connected to the busbar inside the photovoltaic module, the bayonet 21 provides a reliable mechanical clamping force, realizing a tight fit between the photovoltaic junction box lead and the busbar inside the photovoltaic module.

[0029] It should be noted that the photovoltaic modules involved in the embodiments of this invention can be of any form or specification, such as monocrystalline silicon modules, polycrystalline silicon modules, or thin-film photovoltaic modules. The specific structure and size of the photovoltaic modules do not constitute a limitation of this invention, and can be flexibly selected according to different application scenarios and output power requirements to adapt to the photovoltaic junction box structure and its installation method provided by this invention.

[0030] like Figure 2 and Figure 3 As shown, in order to better support the bayonet 21 and achieve heat dissipation for the diode 3 within a limited space, the support part 2 may include a fixing post 22 and a heat sink 23. The fixing post 22 is fixedly connected to the inner wall of the housing 1 to stabilize the entire support structure. The heat sink 23 is connected to the fixing post 22 by mechanical connection, welding, or integral injection molding. The specific material of the heat sink 23 can be a high thermal conductivity metal material, such as aluminum alloy, copper-aluminum composite material, etc. This embodiment of the invention does not specifically limit this, but only requires that its function be achieved.

[0031] In a specific implementation, the bayonet 21 can be integrated onto the heat sink 23, so that while securing the electrode lead 31, the bayonet 21 on the heat sink 23 engages with the electrode lead 31 of the diode 3, achieving a thermally conductive connection between the electrode lead 31 and the heat sink 23. Therefore, when the photovoltaic module structure generated heat during operation after being installed in the photovoltaic junction box provided in this embodiment of the invention, the diode 3 conducts the heat to the bayonet 21 and the heat sink 23 through the lead 31, thereby accelerating heat dissipation and suppressing localized overheating inside the module.

[0032] Furthermore, the heat sink 23 can be a single fin or a dual-fin structure, such as... Figure 1 and Figure 2As shown, the heat sink 23 may include a first heat sink 231 and a second heat sink 232, which are respectively disposed on the positive and negative sides of the diode 3. A bayonet 21 is provided on both the positive and negative sides, enabling the electrode leads 31 on both sides to be securely connected and form a thermal path, thereby comprehensively improving the heat dissipation effect and electrical connection stability.

[0033] It should be noted that, in order to take into account the displacement and space occupation caused by the down-pressure diode 3 during the actual installation process, when there is only one heat sink 23, through holes or grooves can be set in the vertical projection area of ​​the diode 3 on the heat sink 23 according to the specific size of the diode 3. This ensures that the diode 3 has sufficient room to move when the photovoltaic junction box and photovoltaic module are assembled and installed. This prevents the force of the down-pressure diode 3 from resisting the force of the heat sink 23 supporting the diode 3, thereby causing damage to the photovoltaic junction box.

[0034] In a specific implementation, the heat sink 23 may also include a fixing mounting hole 24 for fixing the heat sink 23 inside the housing 1. The fixing mounting hole 24 can fix the heat sink 23 inside the housing 1 by cooperating with the fixing post 22 provided at the bottom of the inner side of the housing 1.

[0035] like Figure 3 As shown, the bayonet 21 is a deformable structure. To ensure the overall strength of the heat sink, the edge thickness of the bayonet 21 is less than the thickness of the heat sink body. Preferably, the bayonet 21 is a star-shaped structure.

[0036] To accommodate diodes 3 and their electrode leads 31 of different specifications, this invention also provides various structural variations of the bayonet 21, such as: a unidirectional wedge-shaped tooth structure, a double-layer stepped deformation structure, and a radial slotted elastic sheet structure. All of these structures can achieve structural locking and frictional damping when the electrode leads 31 are inserted, preventing reverse dislodgement. Regarding material selection, the bayonet 21 is preferably made of stainless steel elastic material, which has good thermal conductivity and stability, meeting the requirements for operation in outdoor environments.

[0037] Furthermore, the bayonet 21 may be provided with multiple elastic clips circumferentially. These elastic clips may be continuous or discontinuous, and this embodiment of the invention does not specifically limit this. A corresponding lead groove 311 is provided on the electrode lead 31. The lead groove 311 cooperates with the elastic clips. When the lead groove 311 is inserted into the bayonet 21 in a predetermined direction, each elastic clip deforms radially to make room. The maximum deformation displacement of the elastic clip is less than or equal to the width of the lead groove 311. After the lead groove 311 is inserted to the predetermined position, the elastic clips rebound and lock onto the outer wall of the lead groove 311 to prevent the lead groove 311 from moving in the opposite direction of insertion. When it is necessary to release the connection, the lead can be pulled by external force to release the locking mechanism, thereby achieving a detachable fixed connection.

[0038] Specifically, the lead groove 311 is preferably U-shaped or trapezoidal in cross-section to facilitate surface contact after the card flexes and deforms, thereby improving engagement stability and locking area. The groove width of the lead groove 311 can be determined in conjunction with the edge thickness of the latch 21 to ensure that the two can engage. In one feasible embodiment, the groove width of the lead groove 311 can be greater than the edge thickness of the latch 21, so that during the displacement of the electrode lead 31, the edge of the latch 21 can engage with the lead groove 311 to achieve self-locking fixation. Alternatively, the groove width of the lead groove 311 can also be equal to the edge thickness of the latch 21.

[0039] This snap-fit ​​structure not only simplifies assembly but also allows for plug-in or one-time locking connections by adjusting the position of the lead groove 311 and the thickness and strength of the elastic clip 21. During photovoltaic module operation, even under external disturbances such as thermal cycling, vibration, or micro-impact, it maintains good contact and stability, ensuring that the conductive path remains unaffected.

[0040] like Figure 4 As shown, the bottom of the housing 1 can be provided with a base plate, and the base plate has through holes corresponding to the electrode leads 31. The electrode leads 31 can extend to the outside of the housing 1 through these through holes to be installed on the photovoltaic module to form a photovoltaic module structure. The through holes here can adopt a stepped hole design to prevent the electrode leads 31 from sliding or loosening before being pressed or secured in place, thereby improving the overall stability of the pre-installed state. Alternatively, the housing 1 may not have a base plate, in which case the electrode leads 31 can extend directly from the bottom of the housing 1 to the outside of the housing 1.

[0041] After the electrode lead 31 extends outside the housing 1, it forms a flattened pin 312. The extension direction of the flattened pin 312 is perpendicular to the thickness direction of the housing 1, and it contacts the internal busbar through the lead hole on the back panel of the photovoltaic module. Figure 5As shown. After applying a certain pressure, the flattened pin 312 contacts the busbar at its bottom, thus achieving the combined installation of the photovoltaic junction box and the photovoltaic module.

[0042] Furthermore, embodiments of the present invention provide a photovoltaic module structure, including: a photovoltaic module and a photovoltaic junction box of any of the above-mentioned components mounted on the photovoltaic module; the electrode lead 31 of the photovoltaic junction box is electrically connected to the busbar inside the photovoltaic module.

[0043] Specifically, the photovoltaic module structure integrates the aforementioned photovoltaic junction box on the basis of existing photovoltaic modules. In this photovoltaic module structure, the flattened pins 312 provided inside the photovoltaic junction box extend to the outside of the box body 1 and are electrically connected to the busbar provided inside the photovoltaic module. The engagement structure of the bayonet 21 and the lead groove 311 enhances the safety and stability of the photovoltaic module structure during operation.

[0044] The photovoltaic module structure provided in this embodiment of the invention, by setting electrode leads 31 inside the photovoltaic junction box, allows the electrode leads 31 to extend from the middle of the box 1 during assembly and directly contact the busbar inside the photovoltaic module, thus eliminating the need for additional independent wiring leads from the busbar. This effectively eliminates the need for extra lead segments extended for wiring in traditional solutions, shortening the wiring length of the busbar itself. The reduced busbar length not only lowers material consumption and the amount of conductive metal strip used, but also simplifies the welding and wiring processes in the preceding steps, improving production efficiency.

[0045] Furthermore, embodiments of the present invention provide an installation method for a photovoltaic junction box. For example... Figure 6 As shown, the installation method of this photovoltaic junction box may include the following steps 1 to 3:

[0046] Step 1: Apply adhesive to the bottom of the box 1 and apply conductive adhesive to the end of the electrode lead 31;

[0047] Step 2: Align the photovoltaic junction box with the reserved area on the photovoltaic module, so that the end of the electrode lead 31 is aligned with the lead hole corresponding to the busbar inside the photovoltaic module;

[0048] Step 3: After the adhesive has cured, apply pressure to the diode 3 toward the photovoltaic module, causing the electrode lead 31 of the diode 3 to move downward and causing the bayonet 21 to deform radially, so that the bayonet 21 is engaged with the outer wall of the lead groove 311 of the electrode lead 31, and the end of the electrode lead 31 is pressed with the busbar in the photovoltaic module to form an electrical connection, and the photovoltaic junction box is fixed to the photovoltaic module.

[0049] Specifically, in step 1, a layer of adhesive is first evenly applied to the bottom of the photovoltaic junction box 1. This adhesive is used to firmly bond the photovoltaic junction box to the backsheet surface of the photovoltaic module, forming a stable support base. When the bottom of the box 1 has a hollow structure, adhesive can be applied to the four edges of the bottom of the box 1; when the box 1 has a bottom plate with through holes, adhesive can be applied to the bottom plate. Simultaneously, to achieve electrical connection, a layer of conductive adhesive is pre-applied to the end area of ​​the electrode lead 31 located inside the photovoltaic junction box, i.e., the area that contacts the busbar inside the photovoltaic module. The conductive adhesive has good conductivity and flexibility, maintaining stable contact during long-term operation of the module and preventing connection failure due to thermal expansion and contraction or mechanical impact. After completing the above preparation steps, the photovoltaic junction box is aligned with the installation position and positioned in the pre-reserved area on the photovoltaic module, ensuring that the ends of the electrode leads 31 in its internal structure precisely correspond to the lead holes between the busbars inside the photovoltaic module. In this way, the flattened pin 312 can accurately contact the busbar area of ​​the photovoltaic module, forming effective conductivity. In step 3, after the adhesive has cured, pressure is applied towards the photovoltaic module to the diode 3 inside the photovoltaic junction box, causing the diode 3 to generate a downward thrust. This thrust acts on the electrode lead 31 connected to it, causing the electrode lead 31 to extend downward and drive the retainer 21 on it to undergo radial outward deformation. This deformation characteristic stems from the elastic design of the retainer material, allowing it to open radially outward away from the axis of the electrode lead 31 when subjected to external force, and firmly retain itself on the outer wall of the lead groove 311 during elastic recovery. This deformation not only enhances the assembly force between the electrode lead 31 and the junction box, but also provides additional pull-out resistance for the entire structure, effectively preventing detachment caused by external vibration or pulling during use. The engagement structure formed by the bayonet 21 and the electrode lead 31 further ensures effective contact between the end of the electrode lead 31 and the busbar inside the photovoltaic module, guaranteeing that the conductive adhesive fully fills the tiny gaps between the contact surfaces and achieves a tight connection under pressure. Finally, after both the adhesive and conductive adhesive have cured, the photovoltaic junction box is securely installed on the back of the photovoltaic module.

[0050] Compared to existing technologies that commonly use solder to connect photovoltaic junction box leads to busbars inside photovoltaic modules, the method employed in this invention significantly simplifies subsequent maintenance and replacement operations while achieving stable conductivity. Traditional soldering processes rely on high-temperature melting of solder to form metal connections. This not only requires highly skilled operators and advanced equipment, but also necessitates the use of high-temperature soldering tools to remelt the solder and remove the original connections if the junction box needs replacement or internal connections need repair after the photovoltaic module structure leaves the factory. This process is complex and can easily cause damage to the photovoltaic backsheet or irreversible damage to the busbars, severely impacting the subsequent lifespan of the photovoltaic module structure. In contrast, this invention coats the ends of electrode leads 31 with conductive adhesive and forms a tight contact between the ends of electrode leads 31 and the busbars, ensuring low contact resistance and stable connections while avoiding high-temperature operations. Furthermore, the diode 3 drives the bayonet 21 to engage with the electrode lead 31 for secure clamping, eliminating reliance on the physical adhesion strength of the solder. When disassembling the photovoltaic junction box, only the bayonet structure and adhesive bonding surface need to be removed; the entire junction box can be removed without the need for heating or melting equipment, facilitating replacement or maintenance. The conductive layer formed after the conductive adhesive cures possesses a certain degree of flexibility, adapting to dimensional changes caused by thermal expansion and being easily separated during maintenance, unlike solder which forms a permanent connection once cured. Therefore, the photovoltaic junction box provided by this invention significantly improves the assembly efficiency of photovoltaic module structures, effectively reduces manufacturing costs, and makes subsequent maintenance more convenient and cost-effective.

[0051] The following examples illustrate in detail the photovoltaic junction box and photovoltaic junction box installation method provided by the embodiments of the present invention.

[0052] Example 1

[0053] This embodiment provides a method for installing a photovoltaic junction box. First, adhesive is evenly applied to the bottom of the box body 1, and conductive adhesive is applied to the end of the electrode lead 31. The photovoltaic junction box is aligned with a pre-set installation area on the photovoltaic module, so that the end of the electrode lead 31 is aligned with the reserved hole in the busbar inside the photovoltaic module. During the curing process of the adhesive, downward pressure is applied to the diode 3, causing the electrode lead 31 to extend and insert into the hole. At the same time, the bayonet 21 is driven to expand radially and lock the outside of the electrode lead 31, achieving mechanical locking. This method can complete the electrical connection and mechanical fixation between the photovoltaic junction box and the photovoltaic module without welding, and has the advantages of simple process and high reliability, making it suitable for the large-scale assembly of standard photovoltaic modules.

[0054] Example 2

[0055] This embodiment further optimizes the stability and anti-aging performance of the electrical connection based on Embodiment 1. While maintaining the crimp connection method, the ends of the electrode leads 31 are flattened to form flattened pins 312. The surface of the flattened pins 312 is tin-plated, and conductive particles with high-temperature resistance are introduced into the conductive adhesive to enhance the corrosion resistance and long-term conductivity stability of the connection area. In addition, a flexible buffer layer is added to the bayonet 21 to absorb deformation caused by thermal expansion and contraction of the module, further improving the mechanical adaptability of the connection structure. This embodiment not only ensures assembly efficiency but also significantly enhances reliability during use, making it suitable for photovoltaic module structures with high service life requirements.

[0056] Example 3

[0057] This embodiment optimizes the electrode lead 31 based on the aforementioned embodiment to further improve contact reliability and assembly compatibility. Specifically, the electrode lead 31 adopts a two-segment structure design, where the end closer to the diode 3 is a flexible, flat segment, and the end further away from the diode 3 is a press-fit reinforced segment. This structure gives the electrode lead 31 better flexibility when the photovoltaic module expands and contracts due to thermal expansion or contraction or slight deformation, avoiding stress concentration or breakage at the solder joint caused by rigid connections. The surface of the press-fit reinforced segment is enhanced with a longitudinal indentation structure to improve the friction and conductivity stability at the contact surface with the busbar. Through the above-mentioned segmented design of the electrode lead 31, it can adapt to different types of busbar apertures and wiring requirements, while improving the long-term electrical performance stability of the photovoltaic module.

[0058] Example 4

[0059] This embodiment improves upon the aforementioned embodiment by modifying the jaw 21 to enhance assembly tolerance and ease of assembly and disassembly. Specifically, the jaw 21 can be a single-arm jaw structure with elastic reset. This structure can adaptively undergo local elastic deformation during the downward extension of the electrode lead 31. After engaging with the lead groove 311, it completes reverse reset through its own elasticity, securing it firmly. Simultaneously, anti-reverse protrusions are added to the jaw to prevent accidental detachment due to external force or thermal deformation.

[0060] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A photovoltaic junction box comprising: The box body (1), the support part (2) with the bayonet (21), the diode (3) and the electrode lead (31) electrically connected with the electrode of the diode (3), The electrode lead (31) extends to the outside of the box body (1) through the bayonet (21); In the case that the electrode lead (31) is electrically connected with the photovoltaic module, the edge of the bayonet (21) is deformed to engage and fix the electrode lead (31).

2. The photovoltaic junction box according to claim 1, wherein The electrode lead (31) supports the diode (3) in cooperation with the bayonet (21); When the diode (3) is subjected to external pressure, the electrode lead (31) is displaced, and the edge of the bayonet (21) is deformed.

3. The photovoltaic junction box according to claim 1, wherein The support part (2) comprises a fixing column (22) arranged on the box body (1) and a heat sink (23) fixedly connected with the fixing column; The bayonet (21) is arranged on the heat sink (23); After the photovoltaic junction box is installed on the photovoltaic module, the bayonet (21) on the heat sink (23) engages with the electrode lead (31) of the diode (3).

4. The photovoltaic junction box according to claim 3, wherein The heat sink (2) comprises a first heat sink (231) arranged on the positive electrode side of the diode (3) and a second heat sink (232) arranged on the negative electrode side of the diode (3); The first heat sink (231) is provided with the bayonet (21) near the area on the positive electrode side of the diode (3); The second heat sink (232) is provided with the bayonet (21) near the area on the negative electrode side of the diode (3).

5. The photovoltaic junction box according to claim 3 or 4, wherein The bayonet (21) is a star-shaped structure arranged in a circumferential direction; And / or, The edge thickness of the bayonet (21) is less than the thickness of the heat sink (2).

6. The photovoltaic junction box according to claim 3 or 4, wherein The bayonet (21) comprises a plurality of radially distributed elastic cards; The electrode lead (31) is provided with a lead groove (311); When the electrode lead (31) moves along the thickness direction of the box body (1), the lead groove (311) is inserted into the bayonet (21), so that the elastic card is deformed in the radial direction away from the axis of the electrode lead (31), and the deformed elastic card engages with the lead groove (311); or, when the electrode lead (31) moves along the thickness direction of the box body (1), the lead groove (311) is disengaged from the elastic card; The thickness of the elastic card is less than the thickness of the heat sink (2).

7. The photovoltaic junction box according to claim 1, wherein The box body (1) comprises a bottom plate provided with a through hole corresponding to the electrode lead (31). The electrode lead (31) extends to outside of the box body (1) through the through hole.

8. The photovoltaic junction box of claim 1, wherein, The electrode lead (31) comprises a flattened pin (312) outside of the box body (1). The extension direction of the flattened pin (312) is perpendicular to the thickness direction of the box body (1). The flattened pin (312) is electrically connected with the bus bar inside the photovoltaic module through the lead hole arranged on the back of the photovoltaic module.

9. A photovoltaic module structure, characterized by, The photovoltaic module and the photovoltaic junction box according to any one of claims 1 to 8 are installed on the photovoltaic module. The electrode lead (31) of the photovoltaic junction box is electrically connected with the bus bar inside the photovoltaic module. The photovoltaic module and the photovoltaic junction box according to any one of claims 1 to 8 are installed on the photovoltaic module.

10. A method of installing a photovoltaic junction box according to any one of claims 1 to 8, characterised in that, The electrode lead (31) of the photovoltaic junction box is electrically connected with the bus bar inside the photovoltaic module. The photovoltaic module and the photovoltaic junction box according to any one of claims 1 to 8 are installed on the photovoltaic module. The electrode lead (31) of the photovoltaic junction box is electrically connected with the bus bar inside the photovoltaic module. The photovoltaic module and the photovoltaic junction box according to any one of claims 1 to 8 are installed on the photovoltaic module. The electrode lead (31) of the photovoltaic junction box is electrically connected with the bus bar inside the photovoltaic module. The photovoltaic module and the photovoltaic junction box according to any one of claims 1 to 8 are installed on the photovoltaic module. The electrode lead (31) of the photovoltaic junction box is electrically connected with the bus bar inside the photovoltaic module. The photovoltaic module and the photovoltaic junction box according to any one of claims 1 to 8 are installed on the photovoltaic module. The electrode lead (31) of the photovoltaic junction box is electrically connected with the bus bar inside the photovoltaic module. The photovoltaic module and the photovoltaic junction box according to any one of claims 1 to 8 are installed on the photovoltaic module. The electrode lead (31) of the photovoltaic junction box is electrically connected with the bus bar inside the photovoltaic module. The photovoltaic module and the photovoltaic junction box according to any one of claims 1 to 8 are installed on the photovoltaic module. The electrode lead (31) of the photovoltaic junction box is electrically connected with the bus bar inside the photovoltaic module. The photovoltaic module and the photovoltaic junction box according to any one of claims 1 to 8 are installed on the photovoltaic module. The electrode lead (31) of the photovoltaic junction box is electrically connected with the bus bar inside the photovoltaic module. The photovoltaic module and the photovoltaic junction box according to any one of claims 1 to 8 are installed on the photovoltaic module. The electrode lead (31) of the photovoltaic junction box is electrically connected with the bus bar inside the photovoltaic module. The photovoltaic module and the photovoltaic junction box according to any one of claims 1 to 8 are installed on the photovoltaic module. The electrode lead (31) of the photovoltaic junction box is electrically connected with the bus bar inside the photovoltaic module. The photovoltaic module and the photovoltaic junction box according to any one of claims 1 to 8 are installed on the photovoltaic module. The electrode lead (31) of the photovoltaic junction box is electrically connected with the bus bar inside the photovoltaic module. The photovoltaic module and the photovoltaic junction box according to any one of claims 1 to

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