CN218006192U - Split type terminal box of photovoltaic module, photovoltaic module - Google Patents

Abstract

The utility model discloses a split type junction box of a photovoltaic assembly, the photovoltaic assembly, which comprises a junction box body and a cable electrically connected with a connector, wherein the cable is welded with a bus bar of the photovoltaic assembly to form a welding area; the junction box body and the photovoltaic assembly are correspondingly matched in a sealing mode to form a protection space, and the welding area is installed in the protection space in a sealing mode and used for achieving sealing protection on the welding area; the utility model discloses can obviously reduce junction box body's installation thickness, increase the installation flexibility, and effectively reduced because of the too high shadow that causes photovoltaic module of terminal box mounting height shelters from the problem.

Description

Split type terminal box of photovoltaic module, photovoltaic module

Technical Field

The utility model relates to a photovoltaic module field, in particular to photovoltaic module's split type terminal box, this photovoltaic module who has related to applied this split type terminal box.

Background

The junction box is one of key parts in the photovoltaic modules, and mainly plays a role in conveying electricity generated by the solar cells outwards and simultaneously playing a role in mutual series and parallel connection among the photovoltaic modules.

The existing junction box generally comprises a diode, a welding metal piece, a box body, a box cover, a cable, a connector and the like, and is connected with a photovoltaic module in a sealing mode through sealant as a whole. Because the junction box needs to be exposed to the external environment for a long time (the service life of the junction box is as long as 25 years), the material of the junction box has higher weather resistance requirement, and a thicker weather-resistant layer needs to be arranged; meanwhile, because a plurality of photovoltaic modules are used after being connected in series, the system voltage of the photovoltaic modules is up to 1000V or 1500V or more, a high-voltage system also puts very high requirements on the voltage endurance capability of the junction box, and high voltage generally requires an insulating layer with higher thickness. Therefore, after the existing junction box and the cable are connected into a whole in a sealing mode, the installation height of the junction box is generally over 12mm, and after the junction box and the photovoltaic module are installed in a bonding mode through silica gel, the installation height (namely the thickness) of the junction box is generally over 15mm.

However, with the development and application of the BIPV technology, people hope to directly stick the photovoltaic module on the building roof, and the photovoltaic module is difficult to perfectly fit with the roof due to the excessively high installation height of the junction box; therefore, the junction box is generally required to be designed on the front side (namely a light receiving surface) of the photovoltaic module, and the junction box is easy to form shadow shielding on the surface of the photovoltaic module due to the installation height of the junction box, so that hot spots are generated to reduce the power generation amount of the module; in addition, in the prior art, three or more junction box bodies are generally adopted, the cost is high, and the shielding area of the front shadow formed at the same time is large.

In addition, because the cables of the junction box generally use round cables, the cross-sectional area of the round conducting wires is generally 4mm ² The thickness of the round cable exceeds 2mm, and due to the existence of the upper protective layer, the lower protective layer and the insulating layer, half of the thickness of the round cable reaches or even exceeds 6mm, which directly becomes one of the reasons of overhigh installation height of the existing junction box.

The applicant therefore sought to solve some of the technical problems of the background art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a photovoltaic module of photovoltaic module terminal box and applied this terminal box can obviously reduce the installation thickness of junction box body, has increased the installation flexibility, and has effectively reduced because of the too high shadow that leads to the fact photovoltaic module of terminal box mounting height and sheltered from the problem.

The utility model adopts the technical scheme as follows:

a split type junction box of a photovoltaic assembly comprises a junction box body and a cable electrically connected with a connector, wherein the cable is welded with a bus bar of the photovoltaic assembly to form a welding area; the junction box body and the photovoltaic assembly are correspondingly matched in a sealing mode to form a protection space, and the welding area is installed in the protection space in a sealing mode and used for achieving sealing protection of the welding area.

Preferably, the bottom of junction box body is equipped with the opening, the welding zone passes through the opening extends into the inside of junction box body, just the opening with photovoltaic module corresponds sealed cooperation, is used for forming protection space.

Preferably, the inside of junction box body is equipped with spacing portion, spacing portion with the periphery of cable corresponds sealed fit.

Preferably, the limiting part extends to the other end along one end of the junction box body.

Preferably, the limiting part and the junction box body are of an integrally formed structure, and the shape of the limiting part corresponds to the peripheral shape of the cable in a limiting and sealing fit mode.

Preferably, the corresponding sealing fit is realized by adopting a sealant.

Preferably, the photovoltaic module comprises a plurality of cell strings, a bypass switch is arranged between every two adjacent cell strings, and the bypass switch is electrically connected with each cell string through a bus bar; and the cell strings positioned on two sides of the photovoltaic module are welded with the cables through bus bars to form the welding area.

Preferably, the junction box body is in a cuboid shape, a cube shape, a semi-ellipsoid shape or a hemispherical shape; the cable is a circular cable or a flat cable.

Preferably, a photovoltaic module comprises the split junction box as described above; the split type junction box is arranged on the front side or the back side of the photovoltaic module.

Preferably, the installation height of the junction box body on the photovoltaic module is not more than 10mm.

The utility model has the advantages and beneficial effects that: the utility model discloses adopt split type structure of being connected with the junction box body and cable, when installing and applying, the cable carries out an organic whole with the connector at first, forms the welding zone with the busbar welding of photovoltaic module both sides simultaneously, the utility model provides a junction box body and photovoltaic module correspond sealed cooperation and form the protection space, install the welding zone seal in this protection space for realize the sealed protective effect to the welding zone; the utility model provides a split type terminal box structure can obviously reduce junction box body's installation thickness, has increased the installation flexibility, on the basis that satisfies conventional performance, the utility model discloses a split type terminal box installation overall height on photovoltaic module (containing sealed glue) can not be greater than 10mm, has effectively reduced because of the too high shade that leads to the fact photovoltaic module of terminal box mounting height and has sheltered from the problem.

The utility model also provides a bypass switch which is electrically connected with each battery string through the bus bar, and the distance between the bypass switch and the outside is only the thickness of the photovoltaic component, so that the heat dissipation speed is faster, and the problem of overhigh temperature caused by the arrangement of a diode in the traditional junction box is avoided; meanwhile, the consumption quantity of the junction boxes is saved, the structural cost is reduced, and the front shadow shielding area is reduced.

The utility model discloses still provide the flat cable of constituteing by the electrically conductive sandwich layer, the insulating layer that are the platykurtic and resistant layer, regard its cable structure as the photovoltaic module terminal box, can obviously reduce the overall height of photovoltaic module terminal box.

Drawings

FIG. 1 is a schematic structural view of a photovoltaic module provided with a split junction box in example 1;

FIG. 2 is an enlarged view of a portion of the structure of FIG. 1;

FIG. 3 is a schematic view showing the state of the process of fitting the junction box body to the soldering region in a sealing manner (with the photovoltaic module hidden) in example 1;

fig. 4 is a schematic view of the installation structure of the rectangular parallelepiped-shaped junction box body and the cable in embodiment 1 (the photovoltaic module is hidden);

fig. 5 is a schematic view of the installation structure of the junction box body and the cable in the semi-ellipsoidal shape in embodiment 1 (the photovoltaic module is hidden);

fig. 6 is a schematic view of the installation structure of the cable and the junction box body in the hemispherical shape in embodiment 1 (the photovoltaic module is hidden);

FIG. 7 is a schematic cross-sectional view of the hemispherically shaped junction box body of FIG. 6 (photovoltaic module shown and flat cable of example 2 employed);

FIG. 8 is a schematic sectional structure view of a flat cable in embodiment 2;

fig. 9 is a schematic view of the connection structure of the flat cable to the connector and the junction box body 11 (including perspective effect) in embodiment 2.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example 1: referring to fig. 1, fig. 2, fig. 4, fig. 7 and fig. 9, a split junction box of a photovoltaic module includes a junction box body 11 (no diode is provided), and a cable 12 electrically connected to a connector 2, where the cable 12 is welded to a bus bar 31 of the photovoltaic module 3 to form a welding region; the photovoltaic module 3 comprises a plurality of battery strings 32, a bypass switch 33 is arranged between every two adjacent battery strings 32, and the bypass switch 33 is electrically connected with each battery string 32 through a bus bar 31; the cell strings 32 positioned at two sides of the photovoltaic module 3 are welded with the cable 12 through the bus bars 31 to form welding areas;

the junction box body 11 and the photovoltaic module 3 are correspondingly matched in a sealing mode to form a protection space 13, and the welding area is installed in the protection space 13 in a sealing mode and used for achieving sealing protection on the welding area; for convenience of installation, in the present embodiment, the bottom of the junction box body 11 is provided with an opening 11a, the welding region extends into the interior of the junction box body 11 through the opening 11a, and the opening 11a is correspondingly and hermetically matched with the photovoltaic module 3 to form a protection space 13;

in the embodiment, the junction box body 11 is set to be in a rectangular parallelepiped shape in implementation application, and may also be set to be in a rectangular parallelepiped shape in other implementation applications; more preferably, as shown in fig. 5, the junction box body 11 'is set to be semi-ellipsoidal, as shown in fig. 6, the junction box body 11 ″ may also be set to be hemispherical, and as the junction box body 11' or the junction box body 11 ″ is flat and smooth as a whole, it can be tightly attached to the photovoltaic module 3 without edge angles, and the appearance effect is more beautiful.

In the implementation of the present embodiment, the cable 12 may be a circular cable or a flat cable; since the flat type cable can make the installation height of the junction box body 11 lower, it is recommended to preferably employ the flat type cable; the specific technical solution of the flat cable can be directly referred to in example 2.

As another implementation variation of this embodiment 1, please refer to fig. 7 and 9 in combination, in order to improve the sealing protection effect on the welding area, a junction box body 11 ″ is set to be hemispherical, and specifically, the flat cable 12' in embodiment 2 is adopted; a limiting part 11b is arranged in the junction box body 11', the limiting part 11b extends to the other end along one end of the junction box body 11', and the limiting part 11b is correspondingly matched with the periphery of the flat cable 12' in a sealing way; particularly preferably, the limiting portion 11b and the junction box body 11 ″ in the present embodiment are of an integrally formed structure, and the shape of the limiting portion 11b corresponds to the outer peripheral shape of the flat cable 12' for limiting and sealing matching.

In order to ensure the sealing protection effect on the welding area and facilitate the installation operation, the corresponding sealing matching in embodiment 1 adopts sealant to realize sealing matching; specifically, as further described with reference to fig. 3 and 4, upon installation, reference may be made to the following steps:

taking the black area a as a gluing area, after gluing the periphery of the bus bar 31, putting the cable 12 provided with the connector 2, and firstly welding the cable 12 and the bus bar 31 to form a welding area 14; then beat the bottom of junction box body 11 all around (including the interior week of spacing portion) glue (black region b as beating the gluey district), correspond to the junction box body 11 and push down and install on welding area 14, until the spacing portion of junction box body 11 corresponds spacing cooperation with the periphery of cable 12, this spacing cooperation mode can make the periphery of cable 12 all be equipped with sealed glue, therefore realized the excellent sealed guard effect to welding area 14.

Referring to fig. 1 and fig. 2 in a further combination, the present embodiment further provides a photovoltaic module 3, wherein the front side of the photovoltaic module 3 includes the split junction box described above in the present embodiment; the mounting height of the junction box body 11 on the photovoltaic module 3 is not more than 10mm; when the flat cable (thickness of 1.8 mm) in embodiment 2 is used, the mounting height of the junction box body 11 ″ on the photovoltaic module can be controlled within 5 mm; particularly preferably, in the present embodiment, a first split junction box and a second split junction box are respectively disposed on the left and right sides of the photovoltaic module 3, wherein the photovoltaic module 3 includes a plurality of battery strings 32, a bypass switch 33 is disposed between each adjacent battery string 32, and the bypass switch 33 is electrically connected to each battery string 32 through the bus bar 31; the battery strings 32 on both sides of the photovoltaic module 3 are electrically connected with the first split junction box and the second split junction box through the bus bar 31, only two split junction boxes need to be arranged, the structure cost is low, and the front shadow shielding area is reduced.

It should be noted that, in other variation, the split junction box provided in this embodiment 1 may also be installed on the back of the photovoltaic module 3.

Example 2: the remaining technical solutions of this embodiment 2 are the same as those of embodiment 1, except that, referring to fig. 8, this embodiment 2 specifically provides a flat cable 12' including a flat conductive core layer 121, an insulating layer 122 covering an outer periphery of the conductive core layer 121, and a weather-resistant layer 123 covering an outer periphery of the insulating layer 122; wherein the thickness of the flat cable 12' is 0.5-5mm, more preferably 0.5-2mm;

in this embodiment 2, the conductive core layer 121 is a flat conductor, and the thickness of the flat conductor is 0.25 to 2mm, more preferably 0.25 to 1.5mm, and still more preferably 0.25 to 1mm; preferably, the flat conductor is a metal conductor, and the metal conductor can be a tinned copper strip or a metal twisted wire or a metal flat cable or other flat metal conductors;

in the present embodiment 2, the thickness of the insulating layer 122 is 0.25 to 1.5mm, more preferably 0.25 to 0.8mm; the insulating layer 122 is preferably made of any one of PE (Polyethylene) or PET (Polyethylene terephthalate), PVC (Polyvinyl chloride), PTFE (polytetrafluoroethylene, commonly known as "teflon"), or other known polymer materials with insulating effect.

In this embodiment 2, the weatherable layer 123 has a thickness of 0.025 to 0.25mm, more preferably 0.025 to 0.2mm; in practical implementation, the weather-resistant layer 123 may be formed by applying a fluorine-containing liquid paint to the outer periphery of the insulating layer and then curing the paint, or may be formed by coating the outer periphery of the insulating layer with a fluorine-containing film (for example, a fluorine-containing film such as PVDF or ETFE).

Specifically, in this embodiment 2, the conductive core layer 121 is a tinned copper tape, the thickness of which is 1.2mm, the insulating layer 122 is a polyethylene insulating layer, the thickness of which is 0.55mm, the weather-resistant layer 123 is a PVDF fluorine-containing thin film, the thickness of which is 0.05mm, and the overall thickness of the flat cable 12' is 1.8mm; therefore, when the cable is used as the cable of the split junction box in the embodiment 1, the total height of the junction box body can be greatly reduced.

As further shown in fig. 9, in the installation application, one end of the flat cable 12' is connected to the connector 3, the other end is welded to the bus bar 31 (only a part of the structure is shown in fig. 9), and the welding area is sealed and protected by the junction box body 11.

It should be particularly noted that the flat cable 12' provided in this embodiment 2 is not limited to be applied as a cable of a split junction box, and can, of course, also be used as a cable of a conventional junction box, and the installation height of the junction box can also be reduced to some extent.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. The split type junction box of the photovoltaic module is characterized by comprising a junction box body and a cable electrically connected with a connector, wherein the cable is welded with a bus bar of the photovoltaic module to form a welding area; the junction box body and the photovoltaic assembly are correspondingly matched in a sealing mode to form a protection space, and the welding area is installed in the protection space in a sealing mode and used for achieving sealing protection of the welding area.

2. The split junction box of claim 1, wherein an opening is formed in the bottom of the junction box body, the welding region extends into the interior of the junction box body through the opening, and the opening is in corresponding sealing fit with the photovoltaic module to form the protective space.

3. The split junction box of claim 1, wherein a limiting portion is provided inside the junction box body, and the limiting portion is correspondingly and hermetically matched with the periphery of the cable.

4. The split junction box of claim 3, wherein the stopper extends along one end of the junction box body to the other end.

5. The split junction box of claim 3, wherein the limiting portion and the junction box body are of an integrally formed structure, and the shape of the limiting portion corresponds to the shape of the periphery of the cable in a limiting and sealing fit mode.

6. The split junction box of claim 1, 2 or 3, wherein the corresponding sealing engagement is achieved by a sealant.

7. The split junction box of claim 1, wherein the photovoltaic module comprises a plurality of cell strings, a bypass switch is disposed between each adjacent cell string, and the bypass switch is electrically connected to each cell string through a bus bar; and the cell strings positioned on two sides of the photovoltaic module are welded with the cable through the bus bars to form the welding area.

8. The split junction box of claim 1, wherein the junction box body has a rectangular parallelepiped shape or a square shape or a semi-ellipsoidal shape or a semi-hemispherical shape; the cable is a circular cable or a flat cable.

9. A photovoltaic module comprising the split junction box of any one of claims 1-8; the split type junction box is arranged on the front side or the back side of the photovoltaic module.

10. The photovoltaic module of claim 9, wherein the junction box body is mounted on the photovoltaic module at a height no greater than 10mm.

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