Junction box

Abstract

The utility model provides a junction box, and relates to the photovoltaic technical field, the junction box comprises a first box body and a second box body, the first box body and the second box body are respectively provided with a connector and a protection block, the connector in one box body is a positive electrode connector, the connector in the other box body is a negative electrode connector, the first box body and the second box body each comprise a first containing cavity and a second containing cavity which are integrally formed, the first containing cavities and the second containing cavities are communicated, the connectors are at least located in the first containing cavities, the protection blocks are located in the second containing cavities, and the connectors and the protection blocks in the same box body are electrically connected. According to the invention, the connector and the protection block are arranged in the integrally formed accommodating cavity, a cable does not need to be introduced between the connector and the protection block, a cable winding process before delivery is avoided, a cable welding process is avoided, resistance caused by the welding process is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, and more specifically, to a junction box. Background Art

[0002] With the development of the photovoltaic industry, photovoltaic modules are increasingly widely used. The photovoltaic module in the prior art includes a photovoltaic junction box, which generally includes a junction box housing and cables, and the cables are led out of the junction box housing. Before the photovoltaic junction box leaves the factory, the cables need to be wound into concentric coils and fixed at the lead-out wires on both sides of the coils with cable ties.

[0003] In the prior art, the photovoltaic junction box is manually wound with cables and tied with cable ties, which has low efficiency, unstable personnel and high cost. Utility Model Content

[0004] In view of this, the utility model provides a junction box, which avoids the introduction of cables between the connector and the protective block by arranging the connector and the protective block in an integrally formed accommodating cavity, avoids the cable winding process before shipment, and avoids the cable welding process, thereby reducing the resistance caused by the welding process and helping to reduce production costs.

[0005] The present application provides a junction box, comprising a first box body and a second box body, wherein the first box body and the second box body are both provided with a connector and a protection block, the connector in one box body is a positive connector, and the connector in the other box body is a negative connector, wherein:

[0006] The first box body and the second box body both include an integrally formed first accommodating cavity and a second accommodating cavity, the first accommodating cavity and the second accommodating cavity are communicated, the connector is located at least in the first accommodating cavity, the protective block is located in the second accommodating cavity, and the connector in the same box body is electrically connected to the protective block.

[0007] Optionally, where:

[0008] The first box body and the second box body both include a first bottom surface, the first accommodating cavity is a columnar structure, and the extension direction of the central axis of the first accommodating cavity intersects with the first bottom surface.

[0009] Optionally, where:

[0010] The first accommodating cavity includes a first end and a second end which are arranged opposite to each other along the extension direction of its axis, the first end is adjacent to the second accommodating cavity, the second end is located on a side of the first end away from the second accommodating cavity, and the distance between the first end and the first bottom surface is smaller than the distance between the second end and the first bottom surface.

[0011] Optionally, where:

[0012] The first bottom surface includes a first sub-bottom surface and a second sub-bottom surface, the first sub-bottom surface is located at the bottom of the first accommodating cavity, the second sub-bottom surface is located at the bottom of the second accommodating cavity, the first sub-bottom surface and the first accommodating cavity are integrally formed, and the second sub-bottom surface and the second accommodating cavity are detachably connected.

[0013] Optionally, where:

[0014] The second sub-bottom surface is fixed to the cavity body of the second accommodating cavity by means of a buckle.

[0015] Optionally, where:

[0016] A first supporting portion is provided on a side of the second sub-bottom surface facing the second accommodating cavity, and the protection block is located on a side of the first supporting portion facing away from the second sub-bottom surface;

[0017] The second sub-bottom surface includes a welding hole, and the welding hole penetrates the second sub-bottom surface along the thickness direction of the second sub-bottom surface; the connector includes a main body and a first connection end connected to the main body, and the protection block includes a second connection end, along the thickness direction of the second sub-bottom surface, the first connection end and the second connection end both overlap with the welding hole, and the first connection end and the second connection end are electrically connected.

[0018] Optionally, where:

[0019] The first connection end and the second connection end are connected by welding.

[0020] Optionally, the second sub-bottom surface includes at least two raised positioning portions arranged toward the second accommodating cavity, the protection block includes at least two positioning holes corresponding to the raised positioning portions, and the raised positioning portions pass through the positioning holes.

[0021] Optionally, where:

[0022] The second accommodating cavity includes a first opening, the first opening is arranged opposite to the first bottom surface, and the area of ​​the first opening is larger than the area of ​​the orthographic projection of the protection block on the first bottom surface;

[0023] The junction box includes an upper cover, and the upper cover covers the first opening.

[0024] Optionally, where:

[0025] The first accommodating cavity has a second opening, and the second opening is located on a side of the first accommodating cavity and communicates with the second accommodating cavity.

[0026] Compared with the prior art, the junction box provided by the utility model achieves at least the following beneficial effects:

[0027] The junction box provided in the present application includes two boxes, namely a first box and a second box, the positive connector is integrated in the first box, and the negative connector is integrated in the second box. When constructing a photovoltaic system, the positive connector and the negative connector in the junction box of a photovoltaic module are respectively connected to the connector of the adjacent photovoltaic module to connect multiple photovoltaic modules to form a component string. In the prior art, when a cable is introduced between the connector and the junction box, a complex cable winding work is required before leaving the factory. In the present application, the first box is integrated with a positive connector and a protection block, and the positive connector and the protection block are electrically connected in the first box; the second box is integrated with a negative connector and a protection block, and the negative connector and the protection block are electrically connected in the second box. Since the positive connector and the protection block are integrated in the first box, there is no need to introduce a cable between the positive connector and the protection block. Similarly, since the negative connector and the protection block are integrated in the second box, there is no need to introduce a cable between the negative connector and the protection block, thereby avoiding the complex process of winding the junction boxes corresponding to the positive connector and the negative connector before leaving the factory, effectively saving labor and production costs. In addition, in the prior art, when a cable is introduced between the connector and the junction box, a complex cable winding process is required before leaving the factory, and both ends of the cable need to be welded separately to achieve electrical connection between the connector and the protection block, that is, welding is required twice. In the junction box of the present application, the connector and the protection block are integrated in the same box body, and the connector and the protection block only need to be welded once to achieve electrical connection. Compared with the prior art, the number of welding times is reduced, thereby avoiding the problem of increased resistance due to a large number of welding times, which is conducive to reducing the resistance in the connection path between the connector and the protection block and improving the current transmission rate.

[0028] Of course, any product implementing the present utility model does not necessarily need to achieve all of the above-mentioned technical effects at the same time.

[0029] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0031] Figure 1 The figure shows a schematic diagram of the structure of a junction box provided in an embodiment of the present application;

[0032] Figure 2Shown is a structural schematic diagram after the junction box of the present application is connected to an external connector;

[0033] Figure 3 Shown is another structural schematic diagram of a junction box provided in an embodiment of the present application;

[0034] Figure 4 Shown is a schematic diagram of the structure inside the first accommodating cavity and the second accommodating cavity;

[0035] Figure 5 Shown in Figure 4 A structural schematic diagram after removing the protection block on the basis of;

[0036] Figure 6 Shown is another structural schematic diagram of a junction box provided in an embodiment of the present application;

[0037] Figure 7 Shown is a side view of the first box body in the junction box provided by the present application;

[0038] Figure 8 Shown is a structural schematic diagram of the bottom of the first box body;

[0039] Fig. 9 Another structural schematic diagram of the bottom of the first box body is shown;

[0040] Fig.10 Shown is a structural schematic diagram of the second sub-bottom surface;

[0041] Fig.11 Shown is a schematic diagram of the structure of a protection block provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0043] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0044] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0045] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0046] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0047] The photovoltaic junction box in the prior art usually includes a junction box housing and a cable. One end of the cable is welded to a protective block in the housing. In practical applications, the other end of the cable needs to be welded to a connector. Before the junction box leaves the factory, the cable needs to be wound into a concentric coil and fixed with cable ties at the lead wires on both sides of the coil. The cable winding and cable tie tying are usually done manually, which has low efficiency, unstable personnel, and high costs.

[0048] In view of this, the utility model provides a junction box to simplify the structure, avoid introducing cables between the connector and the protection block, avoid the cable winding process before shipment, and avoid the welding process of the cable, thereby reducing the resistance caused by the welding process and helping to reduce production costs.

[0049] The following is a detailed description with reference to the accompanying drawings and specific embodiments.

[0050] Figure 1 FIG. 1 is a schematic diagram of a structure of a junction box provided in an embodiment of the present application. Figure 2 It is a schematic structural diagram after the junction box 100 of the present application is connected with the external connector 200, and the external connector 200 is used to be electrically connected with the connector in the junction box. Figure 3 FIG. 1 is another schematic diagram of the structure of the junction box provided in the embodiment of the present application. Figure 1 The difference is Figure 3 Removed the top cover. Figure 4 It is a schematic diagram of the structure inside the first accommodating cavity and the second accommodating cavity. Figure 4 The box body is not shown. Figure 5 Shown in Figure 4 A structural schematic diagram after removing the protection block.

[0051] Please refer to Figures 1 to 5 The present application provides a junction box 100, comprising a first box body 10 and a second box body 20, wherein the first box body 10 and the second box body 20 are both provided with a connector 30 and a protection block 80, wherein the connector 30 in one box body is a positive connector 31, and the connector 30 in the other box body is a negative connector 32, wherein:

[0052] The first box body 10 and the second box body 20 both include an integrally formed first accommodating cavity Q1 and a second accommodating cavity Q2, the first accommodating cavity Q1 and the second accommodating cavity Q2 are communicated, the connector 30 is at least located in the first accommodating cavity Q1, the protective block 80 is located in the second accommodating cavity Q2, and the connector 30 in the same box body is electrically connected to the protective block 80. Figure 3 and Figure 4 The illustrated embodiment is described by taking the example that the first accommodating cavity Q11 in the first box body 10 is used to accommodate the positive connector 31, the second accommodating cavity Q21 is used to accommodate the protection block 81, and the first accommodating cavity Q12 in the second box body 20 is used to accommodate the negative connector 32, and the second accommodating cavity Q22 is used to accommodate the protection block 82.

[0053] It should be noted that Figure 1 The shape and size of the junction box 100 provided are for illustration only and do not limit the actual shape and size of the junction box in the present application. In actual use, the junction box is used to be installed on a photovoltaic module and electrically connected to the busbar of the photovoltaic module to output the current generated by the photovoltaic module. Usually, a plurality of photovoltaic modules can be connected together using a junction box so that the current generated by the plurality of photovoltaic modules can be gathered together and output to form a photovoltaic system with a certain power generation capacity. The protection block in the junction box is used to prevent damage to the cells in the cell string of the photovoltaic module so as to protect the photovoltaic module. Optionally, the protection block includes a diode.

[0054] The junction box provided in the present application includes two boxes, namely a first box 10 and a second box 20, wherein the positive connector 31 is integrated in the first box 10, and the negative connector 32 is integrated in the second box 20. When constructing a photovoltaic system, the positive connector 31 and the negative connector 32 in the junction box of a photovoltaic module are respectively connected to the connector of an adjacent photovoltaic module through an external connector, thereby connecting multiple photovoltaic modules to form a module string. In the prior art, when a cable is introduced between the connector and the junction box, a complicated cable winding work is required before leaving the factory, while in the present application, the positive connector 31 and the protection block 80 are integrated in the first box 10, and the positive connector 31 and the protection block 80 are electrically connected in the first box 10; the negative connector 32 and the protection block 80 are integrated in the second box 20, and the negative connector 32 and the protection block 80 are electrically connected in the second box 20. Since the positive connector 31 and the protection block 80 are integrated in the first box body 10, there is no need to introduce cables between the positive connector 31 and the protection block 80. Similarly, since the negative connector 32 and the protection block 80 are integrated in the second box body 20, there is no need to introduce cables between the negative connector 32 and the protection block 80, thereby avoiding the complex process of winding the junction boxes corresponding to the positive connector 31 and the negative connector 32 before leaving the factory, effectively saving labor and production costs. In addition, in the prior art, when introducing cables between the connector 30 and the junction box, complex cable winding work is required before leaving the factory, and the two ends of the cable need to be welded separately to achieve the electrical connection between the connector 30 and the protection block 80, that is, two weldings are required. In the junction box of the present application, the connector 30 and the protective block 80 are integrated in the same box body. The connector 30 and the protective block 80 only need to be welded once to achieve electrical connection. Compared with the prior art, the number of welding times is reduced, thereby avoiding the problem of increased resistance due to a large number of welding times, which is beneficial to reducing the resistance in the connection path between the connector 30 and the protective block 80 and improving the current transmission rate.

[0055] Please continue to refer to Figures 1 to 4 In the junction box provided in the present application, optionally, the bottom surfaces of the first box body 10 and the second box body 20 are both planar, and the first accommodating cavity Q1 and the second accommodating cavity Q2 are arranged above the bottom surfaces. In the first box body 10, the first accommodating cavity Q1 and the second accommodating cavity Q2 are integrally formed. Specifically, the integral forming can be achieved by an injection molding process.

[0056] Figure 6 Another schematic diagram of the structure of the junction box provided in an embodiment of the present application is shown. In some optional embodiments of the present application, the junction box 100 may include an intermediate box body 90 in addition to the first box body 10 and the second box body 20, and a protection block is also provided in the intermediate box body 90.

[0057] Figure 7 The figure shows a side view of the first box body 10 in the junction box provided by the present application, please refer to Figure 7 In an optional embodiment of the present application, the first box body 10 and the second box body 20 both include a first bottom surface 40 , the first accommodating cavity Q1 is a cylindrical structure, and the extension direction of the central axis Z of the first accommodating cavity Q1 intersects with the first bottom surface 40 .

[0058] Please combine Figures 1 to 7 Optionally, the projection of the second accommodating cavity Q2 on the corresponding first bottom surface 40 can be a rectangular or rounded rectangular structure to facilitate processing. For the accommodating cavity being a cylindrical structure, specifically a cylindrical structure matching the outer contour of the positive connector 31 or the negative connector 32, the central axis of the aforementioned first accommodating cavity Q1 is the central axis of the cylindrical structure, and the extension direction of the central axis intersects with the first bottom surface 40, which can be reflected as the first accommodating cavity Q1 being an inclined structure. Assuming that the length of the first accommodating cavity Q1 is fixed, when the extension direction of the central axis of the first accommodating cavity Q1 is set parallel to the first bottom surface 40, the length of the bottom surface corresponding to the first accommodating cavity Q1 in the first box body 10 is the length of the first accommodating cavity Q1; if the first accommodating cavity Q1 is set at an angle, the length of the bottom surface corresponding to the first accommodating cavity Q1 in the first box body 10 will be less than the length of the first accommodating cavity Q1 (the length of the first accommodating cavity Q1 can be regarded as the long side of a right triangle, and the length of the bottom surface corresponding to it can be regarded as a right-angled side of a right triangle). Therefore, the way of setting the first accommodating cavity Q1 at an angle is conducive to reducing the overall length of the first box body 10, reducing the size of the junction box, reducing the amount of consumables required for the production of the junction box, and helping to save production costs. It should be noted that the first accommodating cavity in both the first box body and the second box body can be set at an angle, which will not be repeated in this application.

[0059] Please continue to refer to Figure 7 In an optional embodiment of the present application, the first accommodating cavity Q1 includes a first end D1 and a second end D2 which are relatively arranged along the extension direction of its axis, the first end D1 is adjacent to the second accommodating cavity Q2, the second end D2 is located on the side of the first end D1 away from the second accommodating cavity Q2, and the distance between the first end D1 and the first bottom surface 40 is smaller than the distance between the second end D2 and the first bottom surface 40.

[0060] Please combine Figure 4 and Figure 7, this embodiment further defines the tilting mode of the first accommodating chamber Q1, specifically, the distance between the first end D1 of the first accommodating chamber Q1 close to the second accommodating chamber Q2 and the first bottom surface 40 is smaller, and the distance between the second end D2 far from the second accommodating chamber Q2 and the first bottom surface 40 is larger, which is equivalent to rotating the second end D2 of the first accommodating chamber Q1 in a direction away from the first bottom surface 40 with the first end D1 as a fixed point, so that the first accommodating chamber Q1 is tilted relative to the first bottom surface 40, so as to achieve the purpose of reducing the overall length of the first box body 10. At the same time, the positive connector 31 or the negative connector 32 is electrically connected to the protection block 80 on the side of the second accommodating chamber Q2 close to the first accommodating chamber Q1. In this embodiment, the first accommodating chamber Q1 is set closer to the first bottom surface 40, which is more conducive to realizing the electrical connection between the positive connector 31 or the negative connector 32 and the corresponding protection block 80.

[0061] Figure 8 FIG. 1 is a schematic diagram showing a structure of the bottom of the first box body 10. Fig. 9 Another schematic diagram of the structure of the bottom of the first box body 10 is shown. Figure 8 The difference is that the second sub-bottom surface 42 is removed. It should be noted that the bottom of the second box body 20 can refer to the first box body 10, and this application will not be repeated. Please refer to Figure 8 and Fig. 9 , and combined with Figure 1 and Figure 4 In an optional embodiment of the present application, the first bottom surface 40 includes a first sub-bottom surface 41 and a second sub-bottom surface 42, the first sub-bottom surface 41 is located at the bottom of the first accommodating cavity Q1, the second sub-bottom surface 42 is located at the bottom of the second accommodating cavity Q2, the first sub-bottom surface 41 is integrally formed with the first accommodating cavity Q1, and the second sub-bottom surface 42 is detachably connected to the second accommodating cavity Q2.

[0062] In the first box body 10 and the second box body 20 provided in the present application, the first sub-bottom surface 41 corresponding to the first accommodating cavity Q1 is integrally formed with the first accommodating cavity Q1, and the second sub-bottom surface 42 corresponding to the second accommodating cavity Q2 is a detachable structure. In practical applications, the second sub-bottom surface 42 can be removed from the bottom surface of the second accommodating cavity Q2, so that the second accommodating cavity Q2 and the part communicating with the first accommodating cavity Q1 and the second accommodating cavity Q2 are exposed. Please refer to Fig. 9In an optional embodiment of the present application, the first accommodating cavity Q1 has a second opening K2, which is located on the side of the first accommodating cavity Q1 and communicates with the second accommodating cavity Q2. When installing the connector 30, the positive connector 31 or the negative connector 32 can be installed into the first accommodating cavity Q1 through the second opening K2 to achieve the installation of the connector 30, and then the second sub-bottom surface 42 is fixed to the second accommodating cavity Q2. The way of installing the connector 30 by disassembling the second sub-bottom surface 42 does not require disassembling the first sub-bottom surface 41, which is conducive to simplifying the overall structure of the junction box.

[0063] Please refer to Figure 8 In an optional embodiment of the present application, the second sub-bottom surface 42 and the cavity of the second accommodating cavity Q2 are fixed by a buckle 70. The buckle fixing method facilitates the disassembly and installation of the second sub-bottom surface 42 and the second accommodating cavity Q2, and is relatively easy to implement in terms of process. It should be noted that a sealing rubber ring can be introduced between the edge of the second sub-bottom surface 42 and the edge of the second accommodating cavity Q2. After the second sub-bottom surface 42 and the second accommodating cavity Q2 are fixed, the rubber ring can be used to achieve the sealing of the box body to improve the overall waterproof performance of the junction box.

[0064] Fig.10 FIG. 4 is a schematic diagram of a structure of the second sub-bottom surface 42. Fig.10 , and combined with Figures 1 to 9 In an optional embodiment of the present application, a first support portion 50 is provided on a side of the second sub-bottom surface 42 facing the second accommodation cavity Q2, and the protection block 80 is located on a side of the first support portion 50 away from the second sub-bottom surface 42;

[0065] The second sub-bottom surface 42 includes a welding hole K0, and the welding hole K0 penetrates the second sub-bottom surface 42 along the thickness direction of the second sub-bottom surface 42; Figure 4 and Figure 5 , the connector 30 includes a main body Z1 and a first connection end L1 connected to the main body Z1, the protective block 80 includes a second connection end L2, along the thickness direction of the second sub-bottom surface 42, the first connection end L1 and the second connection end L2 both overlap with the welding hole K0, and the first connection end L1 and the second connection end L2 are electrically connected. Among them, the connector 31 in the first box body includes a main body Z11 and a first connection end L11, the protective block 81 includes a second connection end L21, and the first connection end L11 and the second connection end L21 are electrically connected; the connector 32 in the second box body includes a main body Z12 and a first connection end L12, the protective block 82 includes a second connection end L22, and the first connection end L12 and the second connection end L22 are electrically connected.

[0066] When the connector 30 is installed in the box body, the main body Z1 of the connector 30 is located in the first accommodating cavity Q1, and the first connection end L1 electrically connected to the main body extends to the second accommodating cavity Q2. After the second sub-bottom surface 42 is fixed to the second accommodating cavity Q2, and the protective block 80 is installed in the second accommodating cavity Q2, the first connection end L1 of the connector 30 and the second connection end L2 of the protective block 80 will overlap above the welding hole K0, and the welding hole K0 on the second sub-bottom surface 42 can expose the first connection end L1 and the area overlapping with the second connection end L2, so that the first connection end L1 and the second connection end L2 can be electrically connected through the welding hole K0. The first support portion 51 on the second sub-bottom surface in the first box body can support the protective block 81, and the first support portion 52 on the second sub-bottom surface in the second box body can support the protective block 82.

[0067] Optionally, refer to Fig.10 Combined with Figure 4 and Figure 5 A second supporting portion 77 may also be provided on the side of the second sub-bottom surface 42 facing the second accommodating cavity Q2, and the second supporting portion 77 is used to support and fix the portion between the main body Z1 and the first connection end L1 in the connector 30 to prevent the connector 30 from shaking and affecting the connection reliability between the first connection end L1 and the second connection end L2.

[0068] It should be noted that Figure 8 As shown, the second sub-bottom surface 42 may include mounting holes in addition to the welding holes K0. These mounting holes are used in the subsequent component installation process to fix the junction box to other devices.

[0069] Please continue to refer to Figure 4 and Figure 5 In an optional embodiment of the present application, the connection method of the first connection terminal L1 and the second connection terminal L2 includes welding. The welding connection method can achieve reliable electrical connection between the first connection terminal L1 and the second connection terminal L2. In addition, since the junction box in the present application integrates the connector 30 and the protection block 80 in the same box body, the connector 30 and the protection block 80 can be electrically connected by one welding. Compared with the method of introducing the cable in the prior art, which requires two weldings, it is beneficial to reduce the resistance of the path formed by the connector 30 and the protection block 80, thereby facilitating the improvement of the current transmission rate.

[0070] Please continue to refer to Fig.10 Combined with Fig.11 as well as Figure 4 and Figure 5 , Fig.11The figure shows a structural schematic diagram of the protection block provided in an embodiment of the present application. In an optional embodiment of the present application, the second sub-bottom surface 42 includes at least two raised positioning portions 60 arranged toward the second accommodating cavity Q2, and the protection block 80 includes at least two positioning holes 66 corresponding to the raised positioning portions 60, and the raised positioning portions 60 pass through the positioning holes 66.

[0071] The present application introduces a raised positioning portion 60 on the first supporting portion, and the raised positioning portion 60 matches the positioning hole 66 on the protective block 80. When the protective block 80 is installed in the second accommodating cavity Q2, the raised positioning portion 60 on the second sub-bottom surface 42 will pass through the positioning hole 66 on the protective block 80 to position the protective block 80. Through positioning, it can be ensured that the second connection end L2 corresponding to the protective block 80 can fall just above the first connection end L1 of the connector 30, which can not only facilitate the electrical connection between the first connection end L1 and the second connection end L2, but also reliably fix the protective block 80 in the second accommodating cavity Q2, so as to avoid the protective block 80 from loosening during use and affecting the electrical connection reliability between the first connection end L1 and the second connection end L2. Optionally, the second sub-bottom surface 52 includes four raised positioning portions 60, and the protective block 80 is correspondingly provided with four positioning holes 66, which are respectively located at the four corners of the protective block 80. Through the cooperation of the positioning holes 66 and the raised positioning portion 60, it is conducive to achieving all-round positioning of the protective block 80.

[0072] Please refer to Figure 1 and Figure 3 In an optional embodiment of the present application, the second accommodating cavity Q2 includes a first opening K1, which is arranged opposite to the first bottom surface 40, and the area of ​​the first opening K1 is larger than the area of ​​the positive projection of the protection block 80 on the first bottom surface 40; the junction box 100 includes an upper cover 00, and the upper cover 00 covers the first opening K1.

[0073] In the box body of the junction box provided by the present application, the second accommodating cavity Q2 is used to set the protection block 80. When the protection block 80 is installed, the protection block 80 will be placed in the second accommodating cavity Q2 from the first opening K1 of the second accommodating cavity Q2. When the area of ​​the first opening K1 is designed to be larger than the area of ​​the protection block 80, it is more convenient to place the protection block 80 in the second accommodating cavity Q2, which is conducive to simplifying the difficulty of assembly. After the protection block 80 is placed in the second accommodating cavity Q2 and the electrical connection between the first connection end and the second electrical connection end is completed, the first opening K1 can be sealed by the upper cover 00. Optionally, the shape of the upper cover 00 matches the shape of the first opening K1, and a sealing ring can be introduced between the edge of the upper cover 00 and the edge of the first opening K1. After the first opening K1 is covered by the upper cover 00, the sealing ring plays a waterproof role, preventing external moisture from entering the second accommodating cavity Q2 from the gap between the upper cover and the first opening K1 and affecting the electrical connection reliability of the first connection end and the second connection end, thereby helping to improve the overall waterproof performance of the junction box.

[0074] It should be noted that the above embodiments are applicable to both the first box body 10 and the second box body 20 in the junction box, and this application will not elaborate on them separately. It should be noted that the positive connector 31 and the negative connector 32 in the embodiment of this application can be embodied in the form of a pin or a socket, and this application does not specifically limit this.

[0075] In summary, the junction box provided by the utility model achieves at least the following beneficial effects:

[0076] The junction box provided in the present application includes two boxes, namely a first box and a second box, the positive connector is integrated in the first box, and the negative connector is integrated in the second box. When constructing a photovoltaic system, the positive connector and the negative connector in the junction box of a photovoltaic module are respectively connected to the connector of the adjacent photovoltaic module to connect multiple photovoltaic modules to form a component string. In the prior art, when a cable is introduced between the connector and the junction box, a complex cable winding work is required before leaving the factory. In the present application, the first box is integrated with a positive connector and a protection block, and the positive connector and the protection block are electrically connected in the first box; the second box is integrated with a negative connector and a protection block, and the negative connector and the protection block are electrically connected in the second box. Since the positive connector and the protection block are integrated in the first box, there is no need to introduce a cable between the positive connector and the protection block. Similarly, since the negative connector and the protection block are integrated in the second box, there is no need to introduce a cable between the negative connector and the protection block, thereby avoiding the complex process of winding the junction boxes corresponding to the positive connector and the negative connector before leaving the factory, effectively saving labor and production costs. In addition, in the prior art, when a cable is introduced between the connector and the junction box, a complex cable winding process is required before leaving the factory, and both ends of the cable need to be welded separately to achieve electrical connection between the connector and the protection block, that is, welding is required twice. In the junction box of the present application, the connector and the protection block are integrated in the same box body, and the connector and the protection block only need to be welded once to achieve electrical connection. Compared with the prior art, the number of welding times is reduced, thereby avoiding the problem of increased resistance due to a large number of welding times, which is conducive to reducing the resistance in the connection path between the connector and the protection block and improving the current transmission rate.

[0077] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A junction box, characterized in that: It includes a first box body and a second box body, wherein the first box body and the second box body are both provided with a connector and a protection block, the connector in one box body is a positive connector, and the connector in the other box body is a negative connector, wherein: The first box body and the second box body both include an integrally formed first accommodating cavity and a second accommodating cavity, the first accommodating cavity and the second accommodating cavity are communicated, the connector is located at least in the first accommodating cavity, the protective block is located in the second accommodating cavity, and the connector in the same box body is electrically connected to the protective block.

2. The junction box according to claim 1, characterized in that: The first box body and the second box body both include a first bottom surface, the first accommodating cavity is a columnar structure, and the extension direction of the central axis of the first accommodating cavity intersects with the first bottom surface.

3. The junction box according to claim 2, characterized in that: The first accommodating cavity includes a first end and a second end which are arranged opposite to each other along the extension direction of its axis, the first end is adjacent to the second accommodating cavity, the second end is located on a side of the first end away from the second accommodating cavity, and the distance between the first end and the first bottom surface is smaller than the distance between the second end and the first bottom surface.

4. The junction box according to claim 2, characterized in that: The first bottom surface includes a first sub-bottom surface and a second sub-bottom surface, the first sub-bottom surface is located at the bottom of the first accommodating cavity, the second sub-bottom surface is located at the bottom of the second accommodating cavity, the first sub-bottom surface and the first accommodating cavity are integrally formed, and the second sub-bottom surface and the second accommodating cavity are detachably connected.

5. The junction box according to claim 4, characterized in that: The second sub-bottom surface is fixed to the cavity body of the second accommodating cavity by means of a buckle.

6. The junction box according to claim 4, characterized in that: A first supporting portion is provided on a side of the second sub-bottom surface facing the second accommodating cavity, and the protection block is located on a side of the first supporting portion facing away from the second sub-bottom surface; The second sub-bottom surface includes a welding hole, and the welding hole penetrates the second sub-bottom surface along the thickness direction of the second sub-bottom surface; the connector includes a main body and a first connection end connected to the main body, and the protection block includes a second connection end, along the thickness direction of the second sub-bottom surface, the first connection end and the second connection end both overlap with the welding hole, and the first connection end and the second connection end are electrically connected.

7. The junction box according to claim 6, characterized in that: The first connection end and the second connection end are connected by welding.

8. The junction box according to claim 6, characterized in that: The second sub-bottom surface includes at least two raised positioning parts arranged toward the second accommodating cavity, the protection block includes at least two positioning holes corresponding to the raised positioning parts, and the raised positioning parts pass through the positioning holes.

9. The junction box according to claim 2, characterized in that: The second accommodating cavity includes a first opening, the first opening is arranged opposite to the first bottom surface, and the area of ​​the first opening is larger than the area of ​​the orthographic projection of the protection block on the first bottom surface; The junction box includes an upper cover, and the upper cover covers the first opening.

10. The junction box according to claim 1, characterized in that: The first accommodating cavity has a second opening, and the second opening is located on a side of the first accommodating cavity and communicates with the second accommodating cavity.

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