Solar photovoltaic module split junction box

Abstract

The utility model discloses a kind of solar photovoltaic module split type terminal box, including positive terminal box, negative terminal box and arbitrary intermediate terminal box, positive terminal box, negative terminal box and intermediate terminal box all include box body and box cover, box body is provided with electric conductor, box body bottom wall is provided with two guide holes, the box body lateral wall of positive terminal box and negative terminal box is provided with cable through-hole, two cables respectively pass through two cable through-holes and are connected with electric conductor in positive terminal box box body and negative terminal box box body, the box body outer wall of positive terminal box and negative terminal box is provided with fixed block, and cable is clamped and fixed by the connection of fixed block and pressing block, sealing ring is arranged between box cover and box body, small hole is opened on pressing block, small hole injects sealed silicone to fill the gap between cable and fixed block and pressing block, box body is filled with filling sealant. The structure carries out multiple sealing waterproof, can improve the service life of terminal box in seaside lake side and other high salinity, high humid environment.

Description

Technical Field

[0001] This utility model relates to the field of solar photovoltaic module technology, specifically to a split junction box for solar photovoltaic modules. Background Technology

[0002] Solar photovoltaic (PV) cells are devices that directly convert solar radiation energy into electrical energy. A PV module is a product made by connecting multiple PV cells in series and parallel and then encapsulating them; it is the basic unit of a photovoltaic power generation system. The PV module junction box is a key component that introduces the electrical energy generated by the solar PV module into the power supply system. Current split-type junction boxes only rely on potting compound for waterproofing. For high-salt, high-humidity environments such as near the sea or lakes, the sealing effect is limited, the waterproof performance of the box is poor, and its service life is short. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a split-type junction box for solar photovoltaic modules. This structure features multiple layers of sealing and waterproofing, which can extend the service life of the junction box in high-salt and high-humidity environments such as seasides and lakesides.

[0004] A split-type junction box for solar photovoltaic modules includes a positive terminal junction box, a negative terminal junction box, and any number of intermediate junction boxes.

[0005] The positive terminal box, negative terminal box, and intermediate terminal box all include detachably connected box bodies and covers.

[0006] The box contains a conductor, and the bottom wall of the box has two guide holes through which two busbars can be connected to the conductor.

[0007] The positive and negative junction boxes have cable through holes on their side walls. Two cables pass through the two cable through holes respectively and enter the positive and negative junction box bodies to connect with the conductors.

[0008] Both the positive and negative junction boxes have fixing blocks on their outer walls. The clamping blocks connect to the fixing blocks to clamp and fix the cables.

[0009] A sealing ring is provided between the cover and the body of the box. A small hole is opened on the pressure block, and sealing silicone is injected into the small hole to fill the gap between the cable and the fixing block and the pressure block.

[0010] The box is filled with potting compound, which seals the guide holes and cable perforations.

[0011] Preferably, the conductor includes a bypass diode chip assembly, which is soldered onto a heat sink. The heat sink has two busbar through-holes and two soldering grooves. Two busbars pass through the two busbar through-holes and are soldered to the heat sink at the two soldering grooves.

[0012] Preferably, the heat sink is made of copper alloy.

[0013] Preferably, the bypass diode chip assembly includes a plastic box and a plurality of bypass diode chips, the plastic box being mounted on a heat sink, and the bypass diode chips being located inside the plastic box and soldered to the heat sink.

[0014] Preferably, the guide hole sidewall is connected to two guide post groups, which are distributed along the front-back direction. Each guide post group includes two guide posts, which are respectively connected to the left and right sidewalls of the guide hole. The guide posts are inclined, and the distance between the top ends of the two guide posts is less than the distance between the bottom ends of the two guide posts.

[0015] Preferably, the lid is connected to the box body by a snap fastener.

[0016] Preferably, the fixing block is provided with anti-rotation ribs.

[0017] Preferably, the box body is provided with multiple fixing posts for fixing the conductor.

[0018] The beneficial effects of this utility model are reflected in the following: In this technical solution, cable through holes are provided on the side walls of the positive and negative junction boxes. During installation, the cable passes through the cable through holes and connects to the conductor. The cable is clamped and fixed by setting fixing blocks and pressure blocks. Sealing silicone is injected through small holes to achieve a sealing and waterproof function at the cable. After installation, potting compound is injected into the box for sealing. Then, the box cover is connected to the box body, and a sealing ring is set to achieve a waterproof sealing function again. Thus, in addition to the traditional potting compound sealing, this device also sets a sealing ring and sealing silicone to seal the box body and the cable, achieving multiple sealing and waterproofing, and improving the service life of the junction box in high-salt and high-humidity environments such as seaside and lakeside areas. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention, including the positive terminal box, the intermediate terminal box, and the top of the negative terminal box;

[0021] Figure 2 This is a schematic diagram of the overall structure of the present invention, including the positive terminal box, the intermediate terminal box, and the bottom of the negative terminal box;

[0022] Figure 3 This is a schematic diagram of the structure of the negative terminal box without the conductor installed in this utility model;

[0023] Figure 4 This is a schematic diagram of the overall structure of the conductive material in this utility model.

[0024] In the attached diagram, 1-box body, 2-conductor, 3-cable, 4-box cover, 5-guide hole, 6-sealing ring, 7-cable through hole, 8-fixing block, 9-pressure block, 10-small hole, 11-fixing post, 12-guide post, 21-bypass diode chip assembly, 22-heat sink, 23-busbar through hole, 24-welding groove. Detailed Implementation

[0025] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0026] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0027] Example 1

[0028] This embodiment provides a split-type junction box for a solar photovoltaic module, including a positive terminal junction box, a negative terminal junction box, and any number of intermediate junction boxes.

[0029] The positive terminal box, negative terminal box, and intermediate terminal box each include a detachably connected box body 1 and a box cover 4.

[0030] The housing 1 contains a conductor 2, and the bottom wall of the housing 1 has two guide holes 5, through which two busbars can be connected to the conductor 2.

[0031] The positive and negative junction boxes 1 have cable through holes 7 on their side walls. Two cables 3 pass through the two cable through holes 7 respectively and enter the positive and negative junction box 1 to connect with the conductor 2.

[0032] Both the positive and negative junction boxes have fixing blocks 8 on their outer walls. The clamping block 9 is connected to the fixing block 8 to clamp and fix the cable 3.

[0033] A sealing ring 6 is provided between the cover 4 and the body 1. A small hole 10 is opened on the pressure block 9. Sealing silicone is injected into the small hole 10 to fill the gap between the cable 3 and the fixing block 8 and the pressure block 9.

[0034] The housing 1 is filled with potting compound, which seals the guide hole 5 and the cable through hole 7.

[0035] In this embodiment, cable through holes 7 are provided on the side walls of the positive and negative junction boxes 1. During installation, the cable 3 passes through the cable through holes 7 and connects to the conductor 2. The cable 3 is clamped and fixed by fixing blocks 8 and pressure blocks 9. The pressure blocks 9 and fixing blocks 8 are fixed by ultrasonic welding. After fixing, sealing silicone is injected through small holes 10 to seal and waterproof the cable 3. After installation, potting compound is injected into the box 1 for sealing. Then, the box cover 4 is connected to the box 1, and a sealing ring 6 is provided to provide waterproof sealing again. Thus, in addition to the traditional potting compound sealing, this device also provides sealing ring 6 and sealing silicone to seal the box 1 and the cable 3. This structure provides multiple sealing and waterproofing, which can improve the service life of the junction box in high-salt and high-humidity environments such as seaside and lakeside.

[0036] In this embodiment, 0-N intermediate junction boxes can be selected based on the actual required rated current, which ranges from 30A to 50A. This embodiment uses one intermediate junction box for connection illustration. During installation, the conductor 2 on the intermediate junction box is connected to the conductor 2 inside the positive and negative junction boxes respectively via two busbars. The box body 1 has a square structure.

[0037] In this embodiment, the conductor 2 includes a bypass diode chip assembly 21, which is soldered onto a heat sink 22. The heat sink 22 has two busbar through-holes 23 and two soldering grooves 24. Two busbars pass through the two busbar through-holes 23 and are soldered to the heat sink 22 at the two soldering grooves 24. Specifically, during installation, the busbars pass through the busbar through-holes 23 and are soldered to the heat sink 22 at the soldering grooves 23, thus achieving the soldering of the busbars to the conductor 2.

[0038] The heat sink 22 described in this embodiment is made of copper alloy. In this embodiment, the heat sink 22 is made of copper alloy with excellent thermal conductivity. The thickness of the heat sink 22 is 0.5-3mm, which can be flexibly selected according to requirements.

[0039] In this embodiment, the potting compound surrounds the conductor 2, and the heat sink 22 with good thermal conductivity gives the device good heat dissipation performance.

[0040] In this embodiment, the bypass diode chip assembly 21 includes a plastic box and several bypass diode chips. The plastic box is mounted on a heat sink 22, and the bypass diode chips are located inside the plastic box and soldered to the heat sink 22. In this embodiment, there are several bypass diode chips with sizes ranging from 80mil to 300mil, which can be flexibly selected according to requirements.

[0041] In this embodiment, the guide hole 5 has two guide post groups connected to its sidewall. These two guide post groups are distributed along the front-to-back direction. Each guide post group includes two guide posts 12, which are respectively connected to the left and right sidewalls of the guide hole 5. The guide posts 12 are inclined, and the distance between the top ends of the two guide posts 12 is less than the distance between their bottom ends. This embodiment uses a guide post group structure that is smaller at the top and larger at the bottom, allowing the busbar to quickly and accurately pass through the guide hole 5 and the busbar through-hole 23 to be welded to the conductor 2, thus improving installation efficiency.

[0042] In this embodiment, the lid 4 is connected to the box body 1 via a snap fastener. This snap fastener connection allows for a detachable connection between the lid 4 and the box body 1.

[0043] In this embodiment, the fixing block 8 is provided with an anti-rotation rib. The anti-rotation rib is provided in this embodiment to hold the cable 3 in place, further fixing the cable and preventing the cable 3 from rotating.

[0044] In this embodiment, the housing 1 is provided with multiple fixing posts 11 for fixing the conductor 2. The fixing posts 11 are provided in this embodiment to fix the conductor 2.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A split-type junction box for solar photovoltaic modules, characterized in that, This includes the positive terminal box, the negative terminal box, and any number of intermediate terminal boxes. The positive terminal box, negative terminal box, and intermediate terminal box all include a detachably connected box body (1) and a box cover (4). The box (1) is equipped with a conductor (2), and the bottom wall of the box (1) is provided with two guide holes (5). The two busbars can be connected to the conductor (2) through the two guide holes (5). The positive terminal box and the negative terminal box have cable through holes (7) on their side walls. Two cables (3) pass through the two cable through holes (7) respectively and enter the positive terminal box (1) and the negative terminal box (1) to connect with the conductor (2). Both the positive and negative junction boxes have fixing blocks (8) on their outer walls. The clamping block (9) is connected to the fixing block (8) to clamp and fix the cable (3). A sealing ring (6) is provided between the cover (4) and the body (1). A small hole (10) is opened on the pressure block (9). Sealing silicone is injected into the small hole (10) to fill the gap between the cable (3) and the fixing block (8) and the pressure block (9). The box (1) is filled with potting compound, which seals the guide hole (5) and the cable through hole (7).

2. The solar photovoltaic module split junction box according to claim 1, characterized in that, The conductor (2) includes a bypass diode chip assembly (21), which is soldered onto a heat sink (22). The heat sink (22) has two busbar through holes (23) and two soldering grooves (24). Two busbars pass through the two busbar through holes (23) and are soldered to the heat sink (22) at the two soldering grooves (24).

3. A split-type junction box for solar photovoltaic modules according to claim 2, characterized in that, The heat sink (22) is made of copper alloy.

4. A split-type junction box for solar photovoltaic modules according to claim 2, characterized in that, The bypass diode chip assembly (21) includes a plastic box and a plurality of bypass diode chips. The plastic box is mounted on a heat sink (22), and the bypass diode chips are located inside the plastic box and soldered to the heat sink (22).

5. A split-type junction box for solar photovoltaic modules according to claim 1, characterized in that, The guide hole (5) has two guide post groups connected to its sidewall. The two guide post groups are distributed along the front-back direction. Each guide post group includes two guide posts (12). The two guide posts (12) are connected to the left and right sidewalls of the guide hole (5) respectively. The guide posts (12) are inclined. The distance between the top ends of the two guide posts (12) is less than the distance between the bottom ends of the two guide posts (12).

6. A split-type junction box for solar photovoltaic modules according to claim 1, characterized in that, The lid (4) is connected to the box body (1) by a snap fastener.

7. A split-type junction box for solar photovoltaic modules according to claim 1, characterized in that, The fixing block (8) is provided with anti-rotation ribs.

8. A split-type junction box for solar photovoltaic modules according to claim 1, characterized in that, The box (1) is provided with multiple fixing posts (11) for fixing the conductor (2).

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