A solar photovoltaic module split junction box

Abstract

The utility model discloses a split junction box for solar photovoltaic components, including a positive box and a negative box arranged relatively, N intermediate boxes are stacked between the positive box and the negative box; the positive box, the intermediate box and the negative box are provided with mutually conductively connected conductors, the positive box, the intermediate box and the negative box are provided with potting glue arranged around the conductors, and the positive box and the negative box are provided with wire grooves for cables to pass through on the outside. The junction box provided in the utility model adopts a split structure as a whole, and a corresponding number of intermediate boxes are arranged between the positive box and the negative box as required, which can perfectly match high-power and high-current solar photovoltaic components, and the potting glue arranged on the outside of the conductor in each box surrounds the conductor, thereby increasing the three-dimensional heat dissipation efficiency of the product and improving the product performance. After the metal heat sink of the cable and the conductor is welded by resistance welding, the size of the box can be further reduced, and the installation flexibility is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic energy, in particular to a solar photovoltaic component split junction box. Background Art

[0002] Solar photovoltaic cells are devices that directly convert sunlight radiation energy into electrical energy. Photovoltaic modules are products made of multiple photovoltaic cells connected in series and parallel and then packaged. They are the basic unit in photovoltaic power generation systems. Photovoltaic module junction boxes are key devices that introduce the electrical energy generated by solar photovoltaic modules into the power supply system.

[0003] At present, the power of photovoltaic modules is getting higher and higher, and the voltage and current are also increasing. At the same time, the installation space of the junction box is becoming increasingly tight, which puts higher requirements on the junction box. The bypass diodes used in conventional junction boxes, such as TO-263 and R6, can no longer meet the requirements of high current and the increasingly tight installation space of the junction box. Therefore, in order to increase the heat dissipation capacity of the bypass diode without expanding the size of the junction box, reduce the cost of the module and the operation risk of the power station, a junction box needs to be developed to match the high-power modules. Utility Model Content

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a split junction box for a solar photovoltaic assembly to solve the problems raised in the above background technology.

[0005] The technical solution adopted by the utility model is: a solar photovoltaic component split junction box, including a positive box and a negative box arranged relatively, N intermediate boxes are stacked between the positive box and the negative box; the positive box, the intermediate box and the negative box are provided with conductors that are conductively connected to each other, the conductors include a metal heat sink and a bypass diode chip, the bypass diode chip is welded on the metal heat sink, and a welding area for connecting cables is provided at one end of the metal heat sink; the positive box, the intermediate box and the negative box are provided with a potting glue arranged around the conductor, and the outer sides of the positive box and the negative box are provided with a wire groove for the cables to pass through.

[0006] In this technical solution, the junction box adopts a split structure as a whole, and a corresponding number of intermediate boxes are arranged between the positive box and the negative box as needed. The stacked installation structure increases the rated current of the junction box, which can perfectly match high-power, high-current solar photovoltaic modules; the conductor connected to the cable is connected by welding, which can further reduce the size of the box compared with the traditional connection method; the potting glue arranged on the outside of the conductor in each box surrounds the conductor, increasing the three-dimensional heat dissipation efficiency of the product and improving product performance; the use of external connecting cables further optimizes the outlet direction, has a more flexible installation space, and is suitable for installation and use in places where installation space is insufficient.

[0007] Furthermore, a plastic packaging body is provided on the bypass diode chip, and square holes and welding grooves for the photovoltaic busbars to pass through are provided on both sides of the metal heat sink corresponding to the plastic packaging body.

[0008] Preferably, the inner bottom walls of the positive electrode box, the intermediate box and the negative electrode box are provided with fixing posts arranged in an array for fixing the metal heat sink, and the metal heat sink is provided with fixing holes corresponding to the fixing posts.

[0009] Preferably, the inner bottom walls of the positive electrode box, the intermediate box and the negative electrode box are provided with guide grooves, oblique ribs arranged in parallel are provided on both sides of the guide grooves, and overflow grooves are provided at the ends of the guide grooves.

[0010] Preferably, the positive electrode box, the intermediate box and the negative electrode box are detachably connected via a snap-fit ​​structure, and the upper ends of the positive electrode box, the intermediate box and the negative electrode box are provided with circumferentially spaced feet.

[0011] Preferably, a protective upper cover is clamped on the upper ends of the positive electrode box, the intermediate box and the negative electrode box, and the inner side walls of the positive electrode box, the intermediate box and the negative electrode box are provided with supporting ribs that abut against the protective upper cover.

[0012] Preferably, a grab handle is provided on the outer side of one end of the intermediate box.

[0013] Preferably, a pressing block for fixing the cable is clamped at the opening of the cable outlet groove, and a pressing rib and a rotation-stopping rib for fixing the cable are provided on the inner wall of the cable outlet groove.

[0014] The beneficial effects of the utility model are as follows: the junction box provided in the utility model adopts a split structure as a whole, and a corresponding number of intermediate boxes are arranged between the positive box and the negative box as needed. The stacked installation structure increases the rated current of the junction box, which can perfectly match high-power and high-current solar photovoltaic components. The potting glue arranged on the outside of the conductor in each box surrounds the conductor, increasing the three-dimensional heat dissipation efficiency of the product and improving product performance. The metal heat sink of the cable and the conductor is resistance welded to further reduce the size of the box and improve installation flexibility; it has high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0016] Figure 1 It is a schematic diagram of the assembly of the split junction box of the solar photovoltaic module provided in the embodiment of the utility model.

[0017] Figure 2 It is a three-dimensional diagram of the positive pole box of the split junction box of the solar photovoltaic assembly provided in the embodiment of the utility model.

[0018] Figure 3 It is a three-dimensional diagram of the negative pole box of the split junction box of the solar photovoltaic assembly provided in the embodiment of the utility model.

[0019] Figure 4 This is a diagram of the conductor structure of the split junction box of a solar photovoltaic module provided in an embodiment of the utility model.

[0020] Figure numerals: positive electrode box 100, negative electrode box 200, intermediate box 300, conductor 400, metal heat sink 410, welding area 420, square hole 430, welding groove 440, fixing hole 450, plastic packaging body 460, potting glue 500, wire groove 600, wire pressing rib 610, anti-rotation rib 620, fixing column 700, guide groove 800, oblique rib 810, overflow groove 820, cable 900, support rib 1000, foot 1100, protective upper cover 1200, grab handle 1300, pressure block 1400, buckle 1500. DETAILED DESCRIPTION

[0021] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0022] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0023] Embodiment 1

[0024] like Figures 1 to 4 As shown, a specific embodiment of the utility model provides a split junction box for a solar photovoltaic component, including a positive box 100 and a negative box 200 arranged relatively to each other, wherein N intermediate boxes 300 are stacked between the positive box 100 and the negative box 200; the positive box 100, the intermediate box 300 and the negative box 200 are provided with conductors 400 that are conductively connected to each other, and the conductors 400 include a metal heat sink 410 and a bypass diode chip, and the bypass diode chip is welded on the metal heat sink 410, and a welding area 420 for connecting a cable 900 is provided at one end of the metal heat sink 410; the positive box 100, the intermediate box 300 and the negative box 200 are provided with a potting glue 500 arranged around the conductor 400, and the outer side of the positive box 100 and the negative box 200 are provided with a wire groove 600 for the cable 900 to pass through.

[0025] like Figures 1 to 4As shown, through the above arrangement, the junction box in this embodiment adopts a split structure as a whole, and a corresponding number of intermediate boxes 300 are arranged between the positive box 100 and the negative box 200 as needed. The superimposed installation structure increases the rated current of the junction box, which can perfectly match high-power, high-current solar photovoltaic components; the conductor 400 connected to the cable 900 is connected by welding, which can further reduce the size of the box body compared with the traditional connection method. In practical applications, the number of bypass diode chips is 1-N, and the size ranges from 80mil-300mil, which can be flexibly selected according to needs; the potting glue 500 arranged on the outside of the conductor 400 in each box body is arranged around the conductor 400, and the potting glue 500 combined with the metal heat sink 410 can significantly increase the three-dimensional space heat dissipation efficiency of the product and improve the product performance. The thickness of the heat sink ranges from 0.5-3mm, and the technicians in this field can flexibly select according to needs; the use of the outer connecting cable 900 further optimizes the outgoing line direction, has a more flexible installation space, and is suitable for installation and use in places where the installation space is not sufficient.

[0026] like Figures 1 to 4 As shown, in this embodiment, a plastic package 460 is provided on the bypass diode chip, and a metal heat sink 410 is provided with square holes 430 and welding grooves 440 for the photovoltaic busbar to pass through on both sides of the plastic package 460 corresponding to the plastic package 460. The plastic package 460 is wrapped around the connection area of ​​the bypass diode chip and the heat sink to improve the product operation stability and core energy.

[0027] Embodiment 2

[0028] like Figures 1 to 4 As shown, the present embodiment further optimizes the structure of the positive box 100, the negative box 200 and the intermediate box 300. Specifically, the inner bottom wall of the positive box 100, the intermediate box 300 and the negative box 200 is provided with fixing posts 700 arranged in an array for fixing the metal heat sink 410. In this way, the metal heat sink 410 with a corresponding number of bypass diode chips is fixed by the fixing posts 700, and the metal heat sink 410 is provided with fixing holes 450 corresponding to the fixing posts 700; the installation stability is improved. In production applications, the fixing posts 700 fix the metal heat sink 410 of the conductor 400 in the box body through a hot melt process.

[0029] As mentioned above, the outer side of the conductor 400 is encapsulated by the potting glue 500 to improve the heat dissipation effect and assembly sealing. In this embodiment, the inner bottom wall of the positive box 100, the middle box 300 and the negative box 200 is provided with a guide groove 800, and the two sides of the guide groove 800 are provided with oblique ribs 810 arranged in parallel, and the end of the guide groove 800 is provided with an overflow groove 820. In this way, after the potting glue 500 is injected into each box body, the overflow groove 820 can make the potting glue 500 more effectively and quickly fill the box body, eliminating the problem of bubbles inside. The structural strength is also ensured by the oblique ribs 810. The potting glue 500 is arranged 360 degrees around the conductor 400 and combined with the metal to increase the heat dissipation area, making full use of the three-dimensional space heat dissipation of the product and improving the product performance.

[0030] like Figures 1 to 4 As shown, in order to facilitate the assembly of the positive box 100, the intermediate box 300 and the negative box 200, in actual application, the positive box 100, the intermediate box 300 and the negative box 200 are detachably connected by a snap-on structure 1500, and the upper ends of the positive box 100, the intermediate box 300 and the negative box 200 are provided with circumferentially spaced feet 1100; the snap-on structure has high fixing stability and is convenient for disassembly; the foot 1100 structure between the box bodies is conducive to ensuring installation stability; in this embodiment, a protective upper cover 1200 is snapped on the upper ends of the positive box 100, the intermediate box 300 and the negative box 200; it plays a role in protecting the conductor 400, and the inner walls of the positive box 100, the intermediate box 300 and the negative box 200 are provided with support ribs 1000 that are against the protective upper cover 1200, and the support ribs 1000 support the protective upper cover 1200 to ensure the installation stability of the protective upper cover 1200. In addition, a grab handle 1300 is provided on the outer side of one end of the intermediate box 300 to facilitate installation and removal of the intermediate box 300.

[0031] like Figures 1 to 4 As shown, in this embodiment, a pressing block 1400 for fixing the cable 900 is clamped at the opening of the outlet groove 600 for installing the cable 900, and the inner wall of the outlet groove 600 is provided with a pressing rib 610 and a rotation-stopping rib 620 for fixing the cable 900. The cable 900 can fix the cable 900, and the pressing block 1400 for fixing the cable 900 fixes the cable 900 by ultrasonic welding, while the rotation-stopping rib 620 and the pressing rib 610 clamp the cable 900, further preventing the cable 900 from retreating and rotating, and having installation stability.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A solar photovoltaic assembly split junction box, comprising a positive electrode box (100) and a negative electrode box (200) arranged opposite to each other, characterized in that: N intermediate boxes (300) are stacked between the positive electrode box (100) and the negative electrode box (200); The positive electrode box (100), the intermediate box (300) and the negative electrode box (200) are provided with mutually conductively connected conductors (400), the conductors (400) comprising a metal heat sink (410) and a bypass diode chip, the bypass diode chip being welded on the metal heat sink (410), and a welding area (420) for connecting a cable (900) being provided at one end of the metal heat sink (410); The positive electrode box (100), the intermediate box (300) and the negative electrode box (200) are provided with a potting glue (500) arranged around the conductor (400), and the outside of the positive electrode box (100) and the negative electrode box (200) are provided with a wire groove (600) for the cable (900) to pass through.

2. The solar photovoltaic module split junction box according to claim 1 is characterized in that ； A plastic package (460) is provided on the bypass diode chip, and square holes (430) and welding grooves (440) for photovoltaic busbars to pass through are provided on both sides of the metal heat sink (410) corresponding to the plastic package (460).

3. The solar photovoltaic module split junction box according to claim 1 is characterized in that ； The inner bottom walls of the positive electrode box (100), the intermediate box (300) and the negative electrode box (200) are provided with fixing columns (700) arranged in an array for fixing metal heat sinks (410), and fixing holes (450) corresponding to the fixing columns (700) are provided on the metal heat sinks (410).

4. The solar photovoltaic module split junction box according to claim 1, characterized in that ； The inner bottom walls of the positive electrode box (100), the intermediate box (300) and the negative electrode box (200) are provided with guide grooves (800), oblique ribs (810) arranged in parallel are provided on both sides of the guide grooves (800), and overflow grooves (820) are provided at the ends of the guide grooves (800).

5. The solar photovoltaic module split junction box according to claim 1, characterized in that ； The positive electrode box (100), the intermediate box (300) and the negative electrode box (200) are detachably connected via a snap-fit ​​structure, and the upper ends of the positive electrode box (100), the intermediate box (300) and the negative electrode box (200) are provided with circumferentially spaced pads (1100).

6. The solar photovoltaic assembly split junction box according to claim 1, characterized in that ； The positive electrode box (100), the intermediate box (300) and the negative electrode box (200) are clamped with a protective upper cover (1200) at their upper ends, and the inner side walls of the positive electrode box (100), the intermediate box (300) and the negative electrode box (200) are provided with supporting ribs (1000) that abut against the protective upper cover (1200).

7. The solar photovoltaic assembly split junction box according to claim 1, characterized in that ； A grab handle (1300) is provided on the outer side of one end of the intermediate box (300).

8. The solar photovoltaic assembly split junction box according to claim 1, characterized in that ； The opening of the cable outlet groove (600) is clamped with a pressing block (1400) for fixing the cable (900), and the inner wall of the cable outlet groove (600) is provided with a pressing rib (610) and a rotation-stopping rib (620) for fixing the cable (900).

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