CN202601657U - Novel photovoltaic conjunction box - Google Patents

Abstract

A novel photovoltaic conjunction box comprises a box body, the bottom of which is provided with several installing holes. The installing holes are used for accessing photovoltaic assembly bus bars. The novel photovoltaic conjunction box also comprises an aluminum PCB; the aluminum PCB is arranged in the box body; the back side of the aluminum PCB is an aluminum plate; the right side of the aluminum PCB is provided with several bus bar weld tabs and several cable conductor weld tabs; the bus bar weld tabs are corresponding to the positions of installing holes, are connected to a photovoltaic assembly protection circuit and are used for connecting the photovoltaic assembly bus bars; and the cable conductor weld tabs are connected to the photovoltaic assembly protection circuit and are cooperated with cable conductors for connecting external cable conductors. According to the utility model, the novel photovoltaic conjunction box is advantageous in that the structure is simple, the volume is small, the weight is light, installation is simple, sealing performance and heat radiation performance are excellent, the service life is long, and cost is low.

Description

New photovoltaic junction box

technical field

The utility model relates to a junction box, in particular to a novel photovoltaic junction box with good sealing performance, good heat dissipation effect and low cost.

Background technique

Photovoltaic junction boxes are used to connect photovoltaic modules. When in use, several photovoltaic modules are connected in series or in parallel by several photovoltaic junction boxes, and through the protection of the diodes inside the photovoltaic junction box, the photovoltaic modules are guaranteed to be It can generate electricity normally under changing weather conditions. The structure of the existing photovoltaic junction box includes: a box body, a box cover arranged on the box body and cooperating with the box body, a plurality of mounting holes for bus bars drawn from the back of the photovoltaic module are opened at the bottom of the box body, Several connectors or equivalent circuit boards are sequentially arranged in the box body, diodes are arranged between the connectors, and wiring holes are arranged on the box body at positions corresponding to the positive and negative connectors respectively. When in use, the positive and negative cables pass through the corresponding wiring holes into the junction box and are respectively connected to the corresponding positive and negative connectors. The other ends of the connectors are respectively connected to the positive and negative bus bars drawn from the back of the component. The connectors are also respectively connected with the corresponding bus bars, which play the role of bypass protection. Due to the large working current of photovoltaic modules, harsh working environment and long working life, photovoltaic junction boxes need to have good waterproof, dustproof, heat dissipation and anti-aging performance; at the same time, it is necessary to reduce the heat emitted by photovoltaic junction boxes during work The impact caused by photovoltaic modules, and the packaging structure of photovoltaic junction boxes directly determine many of the above-mentioned problems.

There are two main packaging methods for existing photovoltaic junction boxes: one is the airtight type, and the sealing rubber ring is filled between the box body and the box cover to isolate the water vapor and dust inside and outside the box. The sealing performance of this method depends on the quality of the sealing rubber ring and the reliability of the combination between the box body and the box cover, which leads to the contradiction between its performance, quality and cost. Moreover, there are many devices for connecting and fixing the protection circuit of the photovoltaic module in the box, so that the overall height of the photovoltaic junction box is 20-40mm, which consumes materials. The other is the potting type, which achieves the sealing effect by pouring curable sealing glue into the body of the photovoltaic junction box. This method has better sealing performance and lower cost, but it does not reduce the fixing device for the protection circuit of the photovoltaic module, so the height of the box body is also 20-30mm.

To sum up, the existing photovoltaic junction box has the disadvantages of complex structure and large volume, and the complex structure leads to poor heat dissipation effect and affects the sealing performance to a certain extent. In addition, the large volume also wastes raw materials and increases production costs.

Utility model content

The purpose of the utility model is to provide a new type of photovoltaic junction box to solve the technical problems of poor heat dissipation, unstable sealing performance and high cost of the existing photovoltaic junction box in the prior art due to its complex structure and large volume.

In order to achieve the above purpose, the utility model provides a novel photovoltaic junction box, which includes a box body with several mounting holes at the bottom, and the mounting holes are used for connecting to the bus bars of photovoltaic modules. It also includes an aluminum-based circuit board, aluminum The base circuit board is set in the box body, and its back is an aluminum plate; the front is provided with a photovoltaic module protection circuit, and the front of the aluminum base circuit board is also provided with a number of bus bar soldering pieces and a number of cable wire welding pieces, and the position of the bus bar welding piece and the installation hole Corresponding, and connected with the photovoltaic module protection circuit, used to connect the photovoltaic module bus bar; the cable soldering piece is connected with the photovoltaic module protection circuit and matched with the cable to connect the external cable.

According to the novel photovoltaic junction box described in the preferred embodiment of the utility model, the front of the box body is also provided with a ventilation and heat dissipation skylight, and the ventilation and heat dissipation skylight corresponds to the aluminum plate on the back of the aluminum-based circuit board.

According to the novel photovoltaic junction box described in the preferred embodiment of the present invention, the box body is injection-molded with POP plastic, and the aluminum-based circuit board is covered in the POP plastic.

According to the novel photovoltaic junction box described in the preferred embodiment of the present utility model, the photovoltaic junction box further includes a box cover, and the box cover is arranged on the installation hole of the bus bar of the box body and connected with the installation hole.

According to the novel photovoltaic junction box described in the preferred embodiment of the present invention, the mounting hole is filled with a sealant for sealing.

According to the novel photovoltaic junction box described in the preferred embodiment of the present invention, the height of the photovoltaic junction box is 10-15 mm.

The utility model adopts the aluminum-based circuit board as the fixing device of the protection circuit of the photovoltaic module, which saves the connection and fixing device in the traditional photovoltaic junction box, saves the installation space to the greatest extent, and reduces the volume of the photovoltaic junction box. The height is only 10-15mm, which saves raw materials and does not need to use a large amount of high-cost sealing glue, which greatly reduces the cost. At the same time, the entire photovoltaic junction box is integrated as a whole, and there is an aluminum substrate in the box for support, which greatly improves the firmness of the junction box. The photovoltaic junction box of the utility model is made by POP injection molding encapsulation, so that the photovoltaic junction box has excellent sealing performance. With good sealing performance, the ventilation and heat dissipation skylight opened on the front of the box can directly penetrate to the back of the aluminum-based circuit board in the box under the premise of ensuring the overall waterproof and dustproof performance of the photovoltaic junction box. In this way, when the photovoltaic module is working, the heat generated at the diode can be quickly dissipated into the surrounding space through the aluminum-based circuit board and the ventilation and heat dissipation skylight on the front of the box, effectively reducing the temperature of the diode. At the same time, because the photovoltaic junction box is integrally injected, the box body is strong and has excellent anti-aging performance, which can ensure the long-term use of the photovoltaic junction box and photovoltaic modules. Therefore, compared with the prior art, the utility model has the advantages of simple structure, light and thin volume, easy installation, excellent sealing performance and heat dissipation performance, long service life and low cost.

Description of drawings

Figure 1 is a schematic diagram of the front structure of the new photovoltaic junction box of the present invention;

Fig. 2 is the overall effect diagram of the installation box cover of the new photovoltaic junction box of the present utility model;

Figure 3 is a schematic diagram of the back structure of the new photovoltaic junction box of the present invention;

Fig. 4 is the perspective view of the aluminum base circuit board of the new embodiment of the utility model;

Fig. 5 is a side sectional view of the photovoltaic junction box of the present utility model.

1-box body, 11-ventilation and heat dissipation skylight, 12-bus bar installation hole, 13-mold fixing hole;

2 - box cover;

3-aluminum-based circuit board, 31-photovoltaic module protection circuit, 32-aluminum plate, 33-bus bar soldering piece, 34-cable wire soldering piece;

4- Cable wire.

Detailed ways

Below in conjunction with accompanying drawing, specifically illustrate the utility model.

Please refer to Figures 1 to 5, a new type of photovoltaic junction box, including a box body 1 with five mounting holes 12 on the bottom, the mounting holes 12 are used to connect to the bus bars of photovoltaic modules, and it also includes an aluminum-based circuit board 3, the aluminum-based circuit board 3 is set in the box body 1, and its back is an aluminum plate 32; The cable soldering piece 34 and the bus bar soldering piece 33 correspond to the position of the mounting hole 12, and are connected to the photovoltaic module protection circuit 31 for connecting the photovoltaic module bus bar; the cable wire welding piece 34 is connected and matched with the photovoltaic module protection circuit 31 There are cables 4 to connect external cables.

Further, as shown in FIG. 1 and FIG. 2 , the front of the box body 1 is also provided with a ventilation and heat dissipation skylight 11 , which corresponds to the aluminum plate 32 on the back of the aluminum-based circuit board 2 . Through the ventilation and heat dissipation skylight 11, the aluminum plate 32 in the box body 1 is directly communicated with the outside world. The front photovoltaic module protection circuit 31 and the back aluminum plate 32 of the aluminum-based circuit board 3 are insulated from each other but can conduct heat efficiently. Through the ventilation and heat dissipation skylight 11, the heat generated when the photovoltaic junction box works is conducted to the back of the aluminum-based circuit board. When the aluminum plate is 32, it can quickly dissipate into the surrounding atmosphere and reduce the internal temperature of the photovoltaic junction box, which greatly improves the heat dissipation performance of the photovoltaic junction box on the premise of ensuring the overall sealing performance and insulation performance of the photovoltaic junction box.

Specifically, the box body 1 is injection molded by POP plastic, and the aluminum-based circuit board 3 is covered in the POP plastic.

As shown in FIG. 2 , the photovoltaic junction box further includes a box cover 2 , and the box cover 2 is arranged on the bus bar mounting hole 12 of the box body and snapped and connected with the mounting hole 12 .

It should be noted that, in this embodiment, in order to make the overall appearance of the photovoltaic junction box perfect, a box cover 2 is added and fastened to the bus bar installation hole 12 . However, it should be noted that since the box body 1 of the utility model is injection-molded with POP plastic, and the aluminum-based circuit board 3 is covered in the POP plastic, this makes the photovoltaic junction box have good sealing performance and insulation performance. The cover 2 is only for achieving an aesthetic effect, therefore, the box cover 2 is not a necessary structure, and it is specifically selected according to the needs of practical applications. At the same time, in this example, the box cover 2 is buckled and connected with the bus bar installation hole 12. However, the utility model does not limit the specific connection method between the box body 2 and the bus bar installation hole 12. For example, it can also be connected by screw connection, Shaft connection, or even any other way in the prior art that can realize the connection between the two, no matter what kind of connection method is used, should fall within the protection scope of the present utility model.

In addition to the above, as shown in the figure, in this example, the ventilation and heat dissipation skylight 11 is designed as a rectangle. However, it should be noted that the present invention is not limited thereto. For example, a circle shape, a quincunx shape, or even a corresponding logo shape can also be used, so as to achieve both aesthetic and advertising effects. Therefore, the above design of the ventilated and heat-dissipating skylight 11 as a rectangle is only an embodiment, and is not intended to limit the utility model. In addition, five installation holes 12 are provided at the bottom of the box body 1, and five bus bar soldering pieces 33 are provided on the corresponding aluminum-based circuit board 3. However, the utility model does not limit the installation holes 12 and the bus bar soldering pieces 33. Quantity, the specific number of mounting holes 12 and bus bar soldering pieces 33 is designed according to actual use needs, it only needs to correspond to the number of mounting holes 12 and bus bar soldering pieces 33 .

The photovoltaic junction box with the above structure, as shown in Figure 1, Figure 2 and Figure 5, welds several bus bars drawn from the back of the photovoltaic module to the bus bar soldering piece 33 in sequence, and then pours the sealant back into the bus bar for installation. Hole 12 to seal the connection. Afterwards, for the overall appearance of the photovoltaic junction box to be perfect, the box cover 2 can be fastened to the bus bar installation hole 12 .

The photovoltaic junction box of the utility model is packaged by POP injection molding. When packaging, firstly, the protection circuit of the photovoltaic module, bus bar soldering piece, cable wire welding piece and cable wire welding piece are welded on the special high-voltage resistant aluminum substrate. Compatible cables. Secondly, place the welded aluminum-based circuit board in the injection mold of the photovoltaic junction box, and fix the cable, clamp the position of the back of the aluminum-based circuit board corresponding to the ventilation and heat dissipation skylight on the front of the box body, and the front of the aluminum-based circuit board corresponding to the box body The position of the mold fixing hole, and the position of the aluminum-based circuit board in the mold are fixed. Furthermore, it is ensured that the aluminum-based circuit board 3 can finally be placed in the correct position in the photovoltaic junction box. After that, the heated and melted PPO plastic liquid is injected into the mold, so that the PPO plastic liquid covers the aluminum-based circuit board according to the design of the mold, and the bus bar soldering piece is exposed through the groove of the bus bar mounting hole reserved on the mold. Finally, after cooling down, open the mold and take out the photovoltaic junction box.

In a preferred embodiment of the present utility model, in order to ensure that the aluminum-based circuit board 3 can be placed in the correct position in the photovoltaic junction box, five points are evenly distributed on the front of the aluminum-based circuit board 3. Correspondingly, the inside of the mold Set with five fixed rods. During injection molding, the fixing rods and the five points on the aluminum-based circuit board 3 are fastened to each other, and mold fixing holes 13 are left at positions corresponding to the fixing rods on the box body 1 after injection molding, as shown in FIG. 3 . In addition, the back of the aluminum substrate is directly pressed by the pressure block of the heat dissipation skylight. After injection molding, the ventilation and heat dissipation skylight 11 is left on the box body 1 corresponding to the aluminum plate 32 on the back of the aluminum base circuit board 3 .

As shown in Figure 1, Figure 2 and Figure 3, after the photovoltaic junction box is packaged by POP injection molding, the aluminum-based circuit board 3 is buried in the material of the box body 1, and a groove is reserved for the bus bar installation hole 12. The bus bar installation hole 12 is used to realize the welding of the bus bar led out from the back of the photovoltaic module and the corresponding bus bar soldering piece 33 . In this way, since the photovoltaic junction box is integrated as a whole, and the box body is supported by an aluminum substrate, the firmness of the junction box is greatly improved. At the same time, because there is no connection and fixing device in the traditional photovoltaic junction box, the height of the box body can be controlled at 10-15mm, without using a large amount of high-cost sealing glue, which greatly reduces the cost.

The above is only a preferred implementation example of the utility model, and does not limit the utility model in any form. Any content that does not deviate from the technical solution of the utility model is based on the technical essence of the utility model to the above implementation examples. Any simple modifications, equivalent changes and modifications all belong to the scope of the technical solution of the present utility model.

Claims (6)

1. a novel photovoltaic junction box comprises that a bottom offers the box body of some installing holes, and said installing hole is used for inserting the photovoltaic module busbar; It is characterized in that; Also comprise an aluminium base circuit board, said aluminium base circuit board is arranged in the said box body, and its back side is an aluminium sheet; The front is provided with the photovoltaic module protective circuit; Said aluminium base circuit board front also is provided with some busbar weld tabs and some cable weld tabs; Said busbar weld tabs is corresponding with said position of mounting hole, and is connected with said photovoltaic module protective circuit, in order to connect the photovoltaic module busbar; Said cable weld tabs is connected with said photovoltaic module protective circuit and is combined with cable to connect the external electric cable.

2. novel photovoltaic junction box as claimed in claim 1 is characterized in that, said box body front also is provided with the ventilation and heat skylight, and said ventilation and heat skylight is corresponding with said aluminium base back of circuit board aluminium sheet.

3. novel photovoltaic junction box as claimed in claim 1 is characterized in that, said box body adopts the POP injection molding, and said aluminium base circuit board is coated in the said POP plastics.

4. novel photovoltaic junction box as claimed in claim 1 is characterized in that, also comprises a lid, and said lid is arranged on the box body busbar installing hole and is connected with said installing hole.

5. like claim 1 or 4 described novel photovoltaic junction boxes, it is characterized in that, be perfused with fluid sealant in the said installing hole in order to sealing.

6. novel photovoltaic junction box as claimed in claim 1 is characterized in that, the height of said photovoltaic junction box is 10～15mm.

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