Photovoltaic junction box

Abstract

The application relates to a photovoltaic junction box, relates to the field of photovoltaic accessories, and comprises a box body and a junction part integrally connected to the box body, the box body is provided with a containing groove, the junction part is provided with a junction port on the side wall close to and away from the box body, the junction part is provided with a glue pouring cavity, the containing groove, the junction port and the glue pouring cavity are communicated with each other, and the junction part is further provided with a glue pouring port. The application has the effect that the solidification of the glue body can effectively resist external force of pulling the cable, the probability of displacement of the sealing structure driven by the cable is reduced, hidden dangers of electric leakage caused by gaps between the glue body of the junction part and the side wall of the junction part are avoided, and the safety of the photovoltaic junction box is improved.

Description

Technical Field

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

[0002] A photovoltaic junction box is a connecting device between a solar cell array composed of solar cell modules and a solar charging control device. Its main function is to connect and protect the solar photovoltaic modules, connect the power generated by the solar cells to external lines, and conduct the current generated by the photovoltaic modules.

[0003] In related technologies, Chinese Patent Publication No. CN222147560U discloses a photovoltaic panel junction box, including a box body, a mounting base, and a sealing element. The box body has a receiving groove and a first inlet. The diameter of the receiving groove is larger than the diameter of the first inlet. The mounting base has a second inlet. The sealing element is installed on the mounting base. When the mounting base is installed on the box body, the first inlet and the second inlet are spliced ​​together and communicate with each other to form an inlet. The sealing element abuts against the receiving groove. The inner diameter of the sealing element gradually decreases from the side close to the inlet to the side away from the inlet.

[0004] Regarding the aforementioned technologies, although the design of the sealing element abutting the receiving groove achieves a basic sealing effect, the sealing element itself has high elasticity. In actual use, when the cable is pulled by external force, the cable will cause the sealing element to shift, which will cause gaps between the potting compound inside the box and the box wall, ultimately creating a potential leakage hazard. There is still room for improvement. Utility Model Content

[0005] To address the issue that when cables are pulled by external forces, the cables can cause the sealant to shift, creating gaps between the potting compound inside the box and the box wall, thus posing a potential leakage hazard, this application provides a photovoltaic junction box.

[0006] The photovoltaic junction box provided in this application adopts the following technical solution: A photovoltaic junction box includes a main body and a wiring portion integrally disposed on the main body. The main body has a receiving groove. The wiring portion has wiring ports on its side walls near and away from the main body. The wiring portion has a potting cavity. The receiving groove, wiring ports and potting cavity are interconnected. The wiring portion also has a potting port.

[0007] By adopting the above technical solution, after the glue is injected into the glue cavity through the glue inlet, the glue can form a complete sealing structure in the area where the receiving groove, the wiring port and the glue are connected. The glue tightly wraps the cable and fully adheres to the inner wall of the box body and the wiring part. When the cable is pulled by external force, the binding force of the glue on the cable and the adhesion force with the side wall of the wiring part can effectively resist the pulling force, reduce the probability of the cable causing displacement of the sealing-related structure, thereby avoiding the formation of gaps between the potting glue of the wiring part and the side wall of the wiring part, which may lead to leakage hazards, and improve the safety of the photovoltaic junction box.

[0008] Optionally, the wiring part includes a wiring part body with an opening on one side and a cover plate covering the wiring part. The cover plate has side plates integrally provided on both sides near and away from the main body of the box. The wiring part body has a first mounting groove on both sides and a second mounting groove on both side plates. The first mounting groove and the second mounting groove are matched one-to-one to form the wiring port.

[0009] By adopting the above technical solution, when installing cables, the walls of the first and second mounting grooves fit against the periphery of the cable, forming a stable circumferential restraint on the cable, reducing the swaying of the cable in the connector, and ensuring the stability of the connection between the cable and the internal conductive structure of the box body.

[0010] Optionally, at least one side wall of the cover plate is provided with an exhaust port.

[0011] By adopting the above technical solution, gas is discharged during the glue injection process through the vent on the side wall of the cover plate. When too much glue is injected, the excess glue can also be discharged from the vent, which effectively avoids insufficient glue filling and ensures the reliability of the sealing effect.

[0012] Optionally, the cover plate is welded to the main body of the wiring section.

[0013] By adopting the above technical solution, the cover plate and the main body of the wiring part are connected by spot welding, which can form multiple strong weld points on the contact surface of the two, achieving a tight and stable connection. This effectively resists the vibration and impact of the photovoltaic junction box during transportation, installation and use, prevents the cover plate from separating from the main body, and ensures the structural stability during long-term use.

[0014] Optionally, the cover plate is provided with at least two elastic hooks on the side near the main body of the wiring part, and the inner wall of the main body of the wiring part is provided with a snap-fit ​​groove corresponding to each elastic hook. The end of the elastic hook away from the cover plate is provided with a barb, and the barb abuts against the bottom of the snap-fit ​​groove.

[0015] By adopting the above technical solution, the cooperation between the elastic hook and the snap-fit ​​groove enables the rapid assembly of the cover plate and the main body of the wiring part. The contact between the barb and the bottom of the snap-fit ​​groove ensures the connection is firm, reduces the probability of the cover plate loosening, and improves the installation stability of the cover plate in long-term use.

[0016] Optionally, the main body of the box is equipped with two conductive plates in the receiving groove, and a diode disposed between the two conductive plates and connected to the two conductive plates.

[0017] By adopting the above technical solution, the connection structure between the two conductive plates and the diode achieves stable current conduction in the photovoltaic module. The diode reduces the damage of reverse current to the photovoltaic module and improves the electrical protection performance of the photovoltaic junction box. The three are integrated in the receiving groove, which facilitates overall sealing by potting glue and effectively reduces the risk of failure of electrical components due to moisture and corrosion.

[0018] Optionally, the conductive plate is provided with a recessed mounting portion.

[0019] By adopting the above technical solution, the mounting part formed by the recess on the conductive plate provides a precise bonding and positioning area for the busbar, which can effectively prevent the busbar from shifting or misaligning during the bonding process and ensure the relative positional accuracy between the busbar and the conductive plate.

[0020] Optionally, the main body of the box is provided with at least one glue outlet.

[0021] By adopting the above technical solution, the glue outlet of the main body of the box body discharges the air in the receiving groove during glue filling, avoiding the formation of air bubbles that affect the sealing effect; on the other hand, excess glue is discharged through the glue outlet, ensuring that the receiving groove is fully filled with glue and improving the integrity of the seal.

[0022] Optionally, the main body of the box is equipped with a cover that covers the receiving groove. The inner wall of the cover is integrally provided with a plurality of first snap-fit ​​blocks. The main body of the box is integrally provided with second snap-fit ​​blocks that correspond one-to-one with the first snap-fit ​​blocks. The second snap-fit ​​blocks abut against the side of the first snap-fit ​​blocks away from the bottom of the receiving groove.

[0023] By adopting the above technical solution, the abutting structure of the first and second snap-fit ​​blocks enables the cover to be quickly fastened to the main body of the box. The connection is firm and not easy to loosen, which facilitates the disassembly and reassembly of the cover and provides convenience for the later maintenance of internal components, taking into account both sealing performance and maintainability.

[0024] Optionally, the main body of the box is provided with a sealing ring at the opening of the receiving groove, and the two sides of the sealing ring abut against the main body of the box and the cover, respectively.

[0025] By adopting the above technical solution, the sealing ring of the receiving groove is squeezed when the cover is closed, filling the tiny gap between the cover and the main body of the box and forming an additional sealing barrier; combined with the potting seal, a dual protection of "colloidal seal + sealing ring seal" is formed, further improving the overall sealing performance of the main body of the box.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The curing of the colloid can effectively resist the external force of pulling the cable, reducing the probability of the cable causing the sealing structure to shift, thereby avoiding the formation of gaps between the colloid at the connection part and the side wall of the connection part, which could lead to leakage hazards and improve the safety of the photovoltaic junction box. 2. The walls of the first and second mounting slots fit against the periphery of the cable, forming a stable circumferential restraint on the cable, ensuring the stability of the connection between the cable and the internal conductive structure of the box body; 3. Excess adhesive is discharged through the vent on the side wall of the cover plate during the adhesive pouring process, which effectively avoids excessive internal pressure that could cause adhesive overflow or insufficient filling, thus ensuring the reliability of the sealing effect. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of a photovoltaic junction box according to Embodiment 1 of this application.

[0028] Figure 2 This is a schematic diagram of the main body of the box in Embodiment 1 of this application.

[0029] Figure 3 This is a schematic diagram of the structure of the cap in Embodiment 1 of this application.

[0030] Figure 4 This is an exploded partial view of the wiring section body and cover plate in Embodiment 1 of this application.

[0031] Figure 5 This is an exploded partial view of the wiring section body and cover plate in Embodiment 2 of this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Main body of the box; 11. Receiving groove; 12. Conductive plate; 121. Mounting part; 13. Diode; 14. Adhesive outlet; 15. Cover; 151. First snap-fit ​​block; 1511. First guide surface; 16. Second snap-fit ​​block; 161. Second guide surface; 17. Sealing ring; 2. Wiring part; 21. Wiring part body; 211. Adhesive filling cavity; 212. First mounting groove; 213. Snap-fit ​​groove; 22. Cover plate; 221. Adhesive filling port; 222. Vent; 223. Side plate; 2231. Second mounting groove; 224. Elastic hook; 2241. Barb part; 23. Wiring port. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0034] This application discloses a photovoltaic junction box.

[0035] Example 1 Reference Figure 1 The photovoltaic junction box includes a main body 1 and a wiring section 2. The wiring section 2 is integrally connected to one side of the main body 1 to connect cables to electrical components inside the main body 1.

[0036] Reference Figure 2 The main body 1 of the box has a receiving groove 11 for the installation of electrical components of the photovoltaic junction box. Conductive plates 12 and diodes 13 are installed within the receiving groove 11 in the main body 1. There are two conductive plates 12, both fixed to the bottom of the receiving groove 11 by screws, and located on opposite sides, near and away from the junction box 2. Each conductive plate 12 has a recessed mounting portion 121 for attaching a busbar. The diodes 13 are fixedly connected between the two conductive plates 12 and electrically connected to each of the two conductive plates 12 to achieve stable current conduction in the photovoltaic module.

[0037] Reference Figure 2 In order to ensure that the adhesive fully fills the space inside the box body 1 when the adhesive is poured into the receiving groove 11, the box body 1 has at least one adhesive discharge port 14. In Embodiment 1 of this application, there are two adhesive discharge ports 14, both of which are located at the bottom of the receiving groove 11, so that air and excess adhesive in the receiving groove 11 can be discharged through the adhesive discharge ports 14.

[0038] Reference Figure 2 and Figure 3 The main body 1 of the box is also equipped with a cover 15 to cover the receiving groove 11. A plurality of first snap-fit ​​blocks 151 are integrally connected to the inner wall of the cover 15, and these first snap-fit ​​blocks 151 are distributed circumferentially around the cover 15. A second snap-fit ​​block 16, corresponding to each of the first snap-fit ​​blocks 151, is integrally connected to the outer wall of the main body 1 near the opening of the receiving groove 11. The first snap-fit ​​block 151 has a first guide surface 1511 on the side near the bottom of the receiving groove 11, and the second snap-fit ​​block 16 has a second guide surface 161 on the side away from the bottom of the receiving groove 11, so that by abutting the second snap-fit ​​block 16 against the side of the first snap-fit ​​block 151 away from the bottom of the receiving groove 11, the cover 15 and the main body 1 can be snapped together.

[0039] Reference Figure 2 and Figure 3To further improve the sealing performance of the main body 1, a sealing ring 17 is installed at the opening of the receiving groove 11 on the main body 1. The two sides of the sealing ring 17 abut against the main body 1 and the cover 15 respectively, so as to provide a sealing environment for the electrical components of the photovoltaic junction box with the glue filled in the receiving groove 11 after potting.

[0040] Reference Figure 4 The wiring portion 2 includes a wiring portion body 21 and a cover plate 22. The wiring portion body 21 has a potting cavity 211 with an opening on one side. The cover plate 22 is welded to the side of the wiring portion body 21 near the opening of the potting cavity 211 to cover the wiring portion body 21. The wiring portion 2 also has a potting port 221. In Embodiment 1 of this application, the potting port 221 is arranged on the cover plate 22, so that the internal structure of the wiring portion 2 is sealed by potting glue into the potting cavity 211 through the potting port 221. At least one side wall of the cover plate 22 has an exhaust port 222. In Embodiment 1 of this application, there are two exhaust ports 222, which are distributed on opposite sides of the cover plate 22 and penetrate the cover plate 22 along the thickness direction of the cover plate 22, so that air and excess glue in the potting cavity 211 can be discharged through the exhaust port 222.

[0041] Reference Figure 2 and Figure 4 The main body 21 of the wiring section has first mounting grooves 212 on both sides near and away from the main body 1 of the housing. The first mounting grooves 212 penetrate the side wall of the main body 21 of the wiring section 21 along the direction near or away from the main body 1. The cover plate 22 has side plates 223 integrally connected to both sides near and away from the main body 1 of the housing. Each side plate 223 has a second mounting groove 2231, which penetrates the side plate 223 along the direction near or away from the main body 1 of the housing. The first mounting grooves 212 and the second mounting grooves 2231 are matched one-to-one to form the wiring port 23. The wiring port 23, the receiving groove 11 and the potting cavity 211 are interconnected so that the cable passes through the potting cavity 211 and the wiring port 23 and is connected to the electrical components in the receiving groove 11.

[0042] The implementation principle of Example 1 is as follows: Electrical components such as conductive plate 12 and diode 13 are installed in the main body 1 of the box through the slot of the receiving groove 11. Then, the cable is operated through the opening of the wiring part 21, passing through the wiring port 23 and the glue filling cavity 211, and the cable is connected to the electrical components in the receiving groove 11. Then, the cover plate 22 is welded to the wiring part 21 by spot welding. Glue is poured into the glue filling cavity 211 from the glue filling port 221. The glue solidifies to seal the connection. Then, the cover 15 is snapped onto the main body 1 of the box. Glue is poured into the receiving groove 11 through one of the glue drop ports 14. The glue solidifies to seal the main body 1 of the box.

[0043] Example 2 Reference Figure 5The difference between this embodiment and Embodiment 1 lies in the connection method between the cover plate 22 and the wiring part body 21. At least two elastic hooks 224 are integrally connected to the side of the cover plate 22 closest to the wiring part body 21. In Embodiment 2 of this application, there are four elastic hooks 224, which are spaced apart circumferentially along the cover plate 22. A barb portion 2241 is integrally connected to the end of each elastic hook 224 away from the cover plate 22. The inner wall of the wiring part body 21 has corresponding engagement grooves 213. The barbs 2241 abut against the bottom of the engagement grooves 213 to achieve engagement of the cover plate 22 onto the wiring part body 21.

[0044] The implementation principle of Example 2 is as follows: Electrical components such as conductive plate 12 and diode 13 are installed in the main body 1 of the box through the slot of the receiving groove 11. Then, the cable is operated through the opening of the wiring part 21, passing through the wiring port 23 and the glue filling cavity 211, to connect the cable and the electrical components in the receiving groove 11. Then, the cover plate 22 is snapped onto the wiring part 21 through the elastic hook 224 and the snap-fit ​​groove 213, and glue is poured into the glue filling cavity 211 from the glue filling port 221. The glue solidifies to seal the connection. Then, the cover 15 is snapped onto the main body 1 of the box, and glue is poured into the receiving groove 11 through one of the glue drop ports 14. The glue solidifies to seal the main body 1 of the box.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A photovoltaic junction box, characterized in that: The device includes a box body (1) and a wiring part (2) integrally provided on the box body (1). The box body (1) is provided with a receiving groove (11). The wiring part (2) is provided with wiring ports (23) on both the side walls near and away from the box body (1). The wiring part (2) is provided with a glue-filling cavity (211). The receiving groove (11), wiring ports (23) and glue-filling cavity (211) are interconnected. The wiring part (2) is also provided with a glue-filling port (221). The wiring part (2) includes a wiring part body (21) with an opening on one side and a cover plate (22) covering the wiring part (2). The cover plate (22) has side plates (223) integrally provided on both sides near and away from the box body (1). The wiring part body (21) has a first mounting groove (212) on both sides and a second mounting groove (2231) on both side plates (223). The first mounting groove (212) and the second mounting groove (2231) are matched one-to-one to form the wiring port (23). At least one side wall of the cover plate (22) is provided with an exhaust port (222). The cover plate (22) is provided with at least two elastic hooks (224) on the side near the main body (21) of the wiring part. The inner wall of the main body (21) of the wiring part is provided with a snap-fit ​​groove (213) corresponding to the elastic hooks (224). The end of the elastic hook (224) away from the cover plate (22) is provided with a barb (2241), and the barb (2241) abuts against the bottom of the snap-fit ​​groove (213).

2. The photovoltaic junction box according to claim 1, characterized in that: The main body (1) of the box has two conductive plates (12) installed in the receiving groove (11), and a diode (13) disposed between the two conductive plates (12) and connected to the two conductive plates (12).

3. The photovoltaic junction box according to claim 2, characterized in that: The conductive plate (12) is provided with a recessed mounting portion (121).

4. The photovoltaic junction box according to claim 1, characterized in that: The main body of the box (1) is provided with at least one glue outlet (14).

5. The photovoltaic junction box according to claim 1, characterized in that: The main body (1) of the box is equipped with a cover (15) that covers the receiving groove (11). The inner wall of the cover (15) is integrally provided with a plurality of first snap-fit ​​blocks (151). The main body (1) of the box is integrally provided with second snap-fit ​​blocks (16) that correspond one-to-one with the first snap-fit ​​blocks (151). The second snap-fit ​​blocks (16) abut against the side of the first snap-fit ​​blocks (151) away from the bottom of the receiving groove (11).

6. The photovoltaic junction box according to claim 5, characterized in that: The main body of the box (1) is provided with a sealing ring (17) at the opening of the receiving groove (11), and the two sides of the sealing ring (17) abut against the main body of the box (1) and the cover (15) respectively.

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