Photovoltaic module junction box and photovoltaic system

Abstract

The utility model relates to the field of photovoltaic technology, and discloses a photovoltaic module junction box and a photovoltaic system, the photovoltaic module junction box comprises a box body, a cover plate, a cable and a protective member, the box body is internally provided with a cavity, the top is provided with an opening, the cavity is internally provided with a component, the cover plate is installed at the opening, one end of the cable passes through the box body and is connected with the component, and the other end of the cable is connected with the protective member. According to the photovoltaic module junction box, the connectors of the two adjacent photovoltaic module junction boxes are installed in the protection part in a mutual insertion mode, the situation that the connectors are loosened and fall off can be avoided, the reliability of cable connection is ensured, the connection of the cables is facilitated, and the connection reliability of the photovoltaic module junction boxes is improved. And meanwhile, the protection piece can protect the joint and resist external impact.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, specifically to photovoltaic module junction boxes and photovoltaic systems. 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 existing technology, a junction box includes a housing and a connector connected by a cable. Two adjacent photovoltaic modules are interconnected via the connector in each module's junction box to achieve current transmission between them. However, because the two connectors in this type of junction box are directly plugged in, the connection stability is poor, and they are prone to loosening and disconnection. Utility Model Content

[0004] In view of this, the present invention provides a photovoltaic module junction box and a photovoltaic system to solve the problem that the connectors in the photovoltaic junction box are easy to loosen and detach in the prior art.

[0005] In the first aspect, this utility model provides a photovoltaic module junction box, including a box body, a cover plate, a cable, and a protective component. The box body has an internal cavity with an opening at the top. Components are placed inside the cavity. The cover plate is installed at the opening. One end of the cable passes through the box body and connects to the component. A connector is provided at the end of the cable away from the box body. An installation cavity is provided inside the protective component, and two connectors are inserted into each other and installed inside the protective component.

[0006] Beneficial effects: This utility model connects the connectors of two adjacent photovoltaic module junction boxes to each other and installs them inside the protective component, which can prevent the connectors from becoming loose or falling off, ensuring the reliability of the cable connection. At the same time, the protective component can also protect the connectors and resist external impacts.

[0007] In one optional embodiment, the protective component includes a first sleeve and a second sleeve, both of which are provided with grooves. The first sleeve and the second sleeve are detachably connected, and a receiving cavity is formed between the two grooves. The connector is detachably installed in the receiving cavity.

[0008] Beneficial effects: The detachable first and second sheaths in this utility model facilitate the disassembly and maintenance of the connector, and have the advantages of simple structure and convenient use.

[0009] In one alternative embodiment, the first sheath is provided with a buckle or a slot, and the second sheath is provided with a slot or a buckle, with the buckle engaging with the slot.

[0010] Beneficial effects: The first and second sheaths of this utility model adopt a snap-fit ​​and slot-locking method, which has the advantages of simple structure and firm connection.

[0011] In one alternative embodiment, a first seal is movably provided at one end of the cable near the connector, and a first mounting groove is provided on the first sheath and the second sheath, and the first seal is detachably installed in the first mounting groove.

[0012] Beneficial effects: This utility model can improve the sealing performance between the cable and the protective component by detachably installing the first sealing element in the first mounting groove.

[0013] In one alternative embodiment, a second mounting groove is provided on the top of the box, and a second sealing element is installed in the second mounting groove.

[0014] Beneficial effects: This utility model provides a second sealing element between the cover plate and the box body, which can compensate for the gap between the box body and the top cover caused by thermal expansion, improve the sealing between the cover plate and the box body, and prevent condensation caused by the "breathing effect".

[0015] In one alternative embodiment, the side wall of the housing is provided with an end sleeve, and the cable passes through the end sleeve.

[0016] Beneficial effects: The mid-end sleeve of this utility model can protect the side of the cable close to the box, preventing damage to the cable end.

[0017] In one alternative embodiment, a third seal is provided inside the end sleeve, and the cable passes through the third seal.

[0018] Beneficial effects: The present invention provides a third sealing element inside the end sleeve, which can improve the sealing performance between the cable and the box.

[0019] In one alternative implementation, a number of heat dissipation strips are provided on the outer wall of the box.

[0020] Beneficial effects: The heat dissipation strip in this utility model can increase the radiative heat dissipation efficiency of the box body, thus playing a role in heat dissipation of the box body.

[0021] In one alternative implementation, the photovoltaic module junction box also includes a base, with the box body disposed on top of the base.

[0022] In one alternative embodiment, the inner wall of the box is coated.

[0023] Beneficial effects: This utility model provides a coating on the inner wall of the box. The chemical bonds in the coating form a continuous barrier on the inner wall of the box, blocking the diffusion path of water molecules. At the same time, it can also reflect ultraviolet rays and inhibit photo-oxidative aging of the box material.

[0024] Secondly, this utility model also provides a photovoltaic system, including a plurality of photovoltaic modules and the aforementioned photovoltaic module junction box, wherein the photovoltaic module junction box is installed on the photovoltaic modules and the connectors on adjacent photovoltaic modules are plugged into each other.

[0025] Since the photovoltaic system in this utility model includes a photovoltaic module junction box, it has the same beneficial effects as the photovoltaic module junction box, which will not be described in detail here. Attached Figure Description

[0026] 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. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a photovoltaic module junction box according to an embodiment of the present utility model;

[0028] Figure 2 This is another structural schematic diagram of a photovoltaic module junction box according to an embodiment of the present utility model;

[0029] Figure 3 This is an exploded view of the protective component in a photovoltaic module junction box according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the middle box of a photovoltaic module junction box according to an embodiment of the present utility model;

[0031] Figure 5 This is another structural schematic diagram of the middle box of a photovoltaic module junction box according to an embodiment of the present utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Box body; 101. Second mounting groove; 102. Second seal; 103. End sleeve; 104. Third seal; 105. Heat sink; 2. Cover plate; 3. Cable; 301. First seal; 4. Connector; 5. Protective component; 501. First sheath; 5011. Buckle; 5012. Slot; 5013. First mounting groove; 502. Second sheath; 6. Base. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0036] According to embodiments of the present invention, on the one hand, such as Figures 1 to 5 As shown, a photovoltaic module junction box is provided, including a box body 1, a cover plate 2, a cable 3, and a protective component 5. The box body 1 has an internal cavity with an opening at the top. Components are placed inside the cavity. The cover plate 2 is installed at the opening. One end of the cable 3 passes through the box body 1 and connects to the component. A connector 4 is provided at the end of the cable 3 away from the box body 1. The protective component 5 has an installation cavity, and two connectors 4 are inserted into each other and installed inside the protective component 5.

[0037] Specifically, such as Figure 1 and Figure 2 , Figure 4 and Figure 5 As shown, the housing 1 is not specifically limited in this embodiment. For example, in this embodiment, the housing 1 is rectangular with a hollow interior and an opening at the top. Conductive components, such as copper terminals, are installed inside the housing 1. The copper terminals are connected to the cable 3 to lead the electrical energy generated by the photovoltaic module to the outside through the cable 3. The housing 1 can be injection molded from PPS material.

[0038] In this embodiment, as Figure 1 and Figure 2 , Figure 4 and Figure 5 As shown, the shape of the cover matches that of the box 1. For example, in this embodiment, the cover plate 2 is in the shape of a cuboid plate, and its size is slightly larger than the top opening of the box 1. The cover plate 2 has a slot 5012 on the side facing the opening. The slot 5012 is the same size as the opening. When the cover plate 2 is placed on the opening, the top edge of the box 1 is engaged in the slot 5012.

[0039] In this embodiment, bolt holes are provided on the side of the cover plate 2 and the upper side of the box body 1, respectively. Bolts are inserted from the bolt holes on the outside of the cover plate 2 and connected to the bolt holes on the box body 1. In this embodiment, two bolt holes are provided on each of the two opposite sides of the cover plate 2.

[0040] In this embodiment, as Figure 1 and Figure 2As shown, the side of the housing 1 has an opening. One end of the cable 3 extends into the housing 1 to connect with the components, and the other end has a connector 4. In this embodiment, the connector 4 is not specifically limited. For example, in this embodiment, the connector 4 is an MC4 connector 4. In other embodiments, the connector 4 can also be SAC-4, HS-4, D4, etc. Their performance and application scenarios are different, and they need to be selected according to specific circumstances. In the process of selecting the connector 4, factors such as the environment of the photovoltaic power generation system, the voltage and current of the system, and the waterproof and UV resistance performance of the connector 4 need to be considered.

[0041] In this embodiment, as Figure 1 As shown, the shape of the protective component 5 is not specifically limited. For example, in this embodiment, the protective component 5 is cylindrical. The connectors 4 on the two photovoltaic module junction boxes can be detachably installed inside the protective component 5. The protective component 5 can keep the two MC4 male and female connectors 4 tightly inserted to prevent the connectors 4 from becoming loose and causing an increase in operating contact resistance, or the plug from getting wet and causing the connectors 4 to overheat and catch fire.

[0042] This utility model connects the connectors 4 of two adjacent photovoltaic module junction boxes to each other and installs them in the protective component 5. This can prevent the connectors 4 from becoming loose or falling off, ensuring the reliability of the cable 3 connection. At the same time, the protective component 5 can also protect the connectors 4 and resist external impacts.

[0043] In one embodiment, such as Figure 2 and Figure 3 As shown, the protective component 5 includes a first sleeve 501 and a second sleeve 502. Both the first sleeve 501 and the second sleeve 502 are provided with grooves. The first sleeve 501 and the second sleeve 502 are detachably connected, and a receiving cavity is formed between the two grooves. The connector 4 is detachably installed in the receiving cavity.

[0044] Specifically, in this embodiment, the first sheath 501 and the second sheath 502 are symmetrically arranged. Both the first sheath 501 and the second sheath 502 are semi-cylindrical with grooves on their inner sides. The connector 4 can be detachably installed in the grooves. When the sides of the first sheath 501 and the second sheath 502 with grooves are connected, they form a cylindrical structure. Along the axial direction, the first sheath 501 and the second sheath 502 have semi-circular grooves at both ends. The semi-circular grooves are used to install the cable 3, and the size of the semi-circular grooves matches the outer diameter of the cable 3.

[0045] In this utility model, the detachable first sheath 501 and second sheath 502 facilitate the disassembly and maintenance of the connector 4, and have the advantages of simple structure and convenient use.

[0046] In one embodiment, such as Figure 3As shown, the first sheath 501 is provided with a buckle 5011 or a slot 5012, and the second sheath 502 is provided with a slot 5012 or a buckle 5011, with the buckle 5011 engaging with the slot 5012.

[0047] Specifically, in this embodiment, the first sheath 501 and the second sheath 502 are provided with bosses at both ends, and semi-circular grooves are provided on the bosses. A buckle 5011 is provided on one of the bosses of the first sheath 501, and two claws are provided on the buckle 5011. The claws are arc-shaped. Two slots 5012 are provided on one of the bosses of the second sheath 502, and the claws can be detachably engaged in the slots 5012.

[0048] In some other embodiments, the buckle 5011 may be disposed on the second sheath 502, and the corresponding slot 5012 may be disposed on the first sheath 501.

[0049] The first sheath 501 and the second sheath 502 of this utility model are connected by a snap fastener 5011 and a slot 5012, which has the advantages of simple structure and firm connection.

[0050] In one embodiment, such as Figure 3 As shown, a first seal 301 is movably provided at one end of the cable 3 near the connector 4, and a first mounting groove 5013 is provided on the first sheath 501 and the second sheath 502. The first seal 301 is detachably installed in the first mounting groove 5013.

[0051] Specifically, in this embodiment, a circular first sealing element 301 is provided on one end of the cable 3 near the connector 4. The first sealing element 301 can slide along the cable 3. A first mounting groove 5013 is provided on the protrusions of the first sheath 501 and the second sheath 502. The first sealing element 301 can be detachably snapped into the first mounting groove 5013. When the cable 3 expands or contracts due to temperature changes, the first sealing element 301 can slide along the surface of the cable 3 to avoid stress concentration at the sealing interface.

[0052] In this embodiment, the elastic locking design of the arc-shaped claw maintains the stability of the connection under vibration, and the first mounting groove 5013 can suppress the swing of the cable 3 and ensure the reliability of the electrical connection.

[0053] This invention improves the sealing performance between the cable 3 and the protective component 5 by detachably installing the first sealing element 301 in the first mounting groove 5013.

[0054] In one embodiment, such as Figure 4 and Figure 5 As shown, the top of the box body 1 is provided with a second mounting groove 101, and a second sealing element 102 is installed in the second mounting groove 101.

[0055] Specifically, in this embodiment, the top of the box body 1 is provided with a square second mounting groove 101, and a second sealing element 102 is installed in the second mounting groove 101. In this embodiment, the second sealing element 102 is an elastic sealing ring.

[0056] In this embodiment, the elastic sealing ring can also be installed at the bottom of the cover plate 2 at the position corresponding to the second mounting groove 101. During installation, the operator applies tightening force with a torque wrench to make the ring evenly press into the second mounting groove 101, forming a double seal in the radial and axial directions.

[0057] This utility model provides a second sealing element 102 between the cover plate 2 and the box body 1, which can compensate for the gap between the box body 1 and the top cover caused by thermal expansion, improve the sealing between the cover plate 2 and the box body 1, and prevent condensation caused by the "breathing effect".

[0058] In one embodiment, such as Figure 4 and Figure 5 As shown, the side wall of the box 1 is provided with an end sleeve 103, and the cable 3 passes through the end sleeve 103.

[0059] Specifically, in this embodiment, an end sleeve 103 is fixedly connected to the outer wall of the box 1. The end sleeve 103 is cylindrical and has a cavity inside, through which the cable 3 passes.

[0060] The mid-end sleeve 103 of this utility model can protect the side of the cable 3 near the box 1, and prevent the end of the cable 3 from being damaged.

[0061] In one embodiment, such as Figure 4 and Figure 5 As shown, the end sleeve 103 is provided with a third sealing element 104, and the cable 3 passes through the third sealing element 104.

[0062] Specifically, in this embodiment, the third sealing element 104 is a sealing ring. The third sealing element 104 is disposed inside the end sleeve 103, and the cable 3 passes through the sealing ring. The third sealing element 104 inside the end sleeve 103 achieves static sealing through pre-compression deformation, forming a double insurance of dynamic and static combination with the second sealing element.

[0063] This utility model provides a third sealing element 104 inside the end sleeve 103, which can improve the sealing between the cable 3 and the box 1.

[0064] In one embodiment, such as Figure 5 As shown, the outer wall of the box 1 is provided with several vertically parallel heat dissipation strips 105.

[0065] Specifically, in this embodiment, the outer walls of the box body 1 located on both sides of the end sleeve 103 are provided with a number of heat dissipation strips 105, and the surface of the heat dissipation strips 105 is sandblasted to increase the efficiency of radiation heat dissipation.

[0066] In this invention, the heat dissipation strip 105 can increase the radiative heat dissipation efficiency of the box body 1, thereby playing a role in heat dissipation of the box body 1.

[0067] In one embodiment, such as Figure 1 and Figure 2 , Figure 4 and Figure 5 As shown, the photovoltaic module junction box also includes a base 6, and the box body 1 is located on top of the base 6.

[0068] Specifically, in this embodiment, the base 6 is rectangular, with a size larger than that of the box 1, and the bottom of the box 1 is connected to the top of the base 6. In this embodiment, the base 6 is made of aluminum alloy, with mounting holes at the four corners, and the hole spacing is adapted to standard photovoltaic bracket bolts.

[0069] In one embodiment, the inner wall of the box 1 is coated.

[0070] Specifically, in this embodiment, the inner wall of the box 1 is coated with a coating material, which is nano-silica, and forms a dense protective layer after curing.

[0071] This invention provides a coating on the inner wall of the box 1. The coating is chemically bonded to form a continuous barrier on the inner wall of the box 1, blocking the diffusion path of water molecules. At the same time, it can also reflect ultraviolet rays and inhibit the photo-oxidative aging of the material of the box 1.

[0072] According to an embodiment of the present invention, another aspect provides a photovoltaic system, including a plurality of photovoltaic modules and the aforementioned photovoltaic module junction box, wherein the photovoltaic module junction box is mounted on the photovoltaic modules and the connectors 4 on adjacent photovoltaic modules are plugged into each other.

[0073] Specifically, this embodiment does not limit the setting scenario of the photovoltaic system. For example, in this embodiment, the photovoltaic system is set at sea, and the photovoltaic modules are exposed to the outdoor environment for a long time, facing multiple environments such as high temperature, high humidity, and ultraviolet radiation.

[0074] In this embodiment, the photovoltaic module junction box is installed on the photovoltaic backplane of the photovoltaic module, and adjacent photovoltaic modules are connected to form a photovoltaic string through the photovoltaic module junction box.

[0075] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A photovoltaic module junction box, characterized in that, include: Box (1), the inside of the box (1) is a cavity, the top is provided with an opening, and the cavity is provided with components; Cover plate (2), said cover plate (2) is installed at said opening; Cable (3), one end of which passes through the box (1) and connects to the component, and the end of the cable (3) away from the box (1) is provided with a connector (4); The protective component (5) has an installation cavity inside, and the two connectors (4) are inserted into each other and installed inside the protective component (5).

2. The photovoltaic module junction box according to claim 1, characterized in that, The protective component (5) includes a first sleeve (501) and a second sleeve (502). Both the first sleeve (501) and the second sleeve (502) are provided with grooves. The first sleeve (501) and the second sleeve (502) are detachably connected. A receiving cavity is formed between the two grooves. The connector (4) is detachably installed in the receiving cavity.

3. The photovoltaic module junction box according to claim 2, characterized in that, The first sheath (501) is provided with a buckle (5011) or a slot (5012), and the second sheath (502) is provided with a slot (5012) or a buckle (5011), wherein the buckle (5011) engages with the slot (5012).

4. The photovoltaic module junction box according to claim 2 or 3, characterized in that, The cable (3) has a first sealing element (301) movably provided at one end near the connector (4). The first sheath (501) and the second sheath (502) are provided with a first mounting groove (5013). The first sealing element (301) is detachably installed in the first mounting groove (5013).

5. The photovoltaic module junction box according to claim 1, characterized in that, The top of the box (1) is provided with a second mounting groove (101), and a second sealing element (102) is installed in the second mounting groove (101).

6. The photovoltaic module junction box according to claim 1, characterized in that, The box (1) has an end sleeve (103) on its side wall, and the cable (3) passes through the end sleeve (103).

7. The photovoltaic module junction box according to claim 6, characterized in that, The end sleeve (103) is provided with a third sealing element (104), and the cable (3) passes through the third sealing element (104).

8. The photovoltaic module junction box according to claim 1, characterized in that, The outer wall of the box (1) is provided with several heat dissipation strips (105).

9. The photovoltaic module junction box according to claim 1, characterized in that, Also includes: The base (6) and the box (1) are disposed on the top of the base (6).

10. The photovoltaic module junction box according to claim 1, characterized in that, The inner wall of the box (1) is coated.

11. A photovoltaic system, characterized in that, include: Several photovoltaic modules; A photovoltaic module junction box according to any one of claims 1 to 10, wherein the photovoltaic module junction box is installed on the photovoltaic module and the connectors (4) on adjacent photovoltaic modules are plugged into each other.

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