CN220156487U - Photovoltaic junction box and photovoltaic power generation system - Google Patents

Abstract

The embodiment of the utility model provides a photovoltaic junction box and a photovoltaic power generation system, and relates to the technical field of photovoltaic power generation. The photovoltaic junction box comprises a box body, a diode and two conducting strips, wherein a containing cavity is formed in the box body, the diode and the two conducting strips are arranged in the containing cavity, and the two conducting strips are electrically connected through the diode; the box body is provided with a threading hole communicated with the accommodating cavity, and the threading hole is used for threading the bus bar; the box body is further provided with a guide surface, the guide surface is located on one side, far away from the accommodating cavity, of the threading hole, and when the bus bar is arranged in a penetrating mode, the guide surface is used for guiding the end portion of the bus bar to the threading hole. The operation is simpler when wearing to establish the busbar.

Description

Photovoltaic junction box and photovoltaic power generation system

Technical Field

The embodiment of the utility model relates to the technical field of photovoltaic power generation, in particular to a photovoltaic junction box and a photovoltaic power generation system.

Background

In the photovoltaic power generation system, a photovoltaic junction box is electrically connected with a photovoltaic cell matrix formed by a photovoltaic cell assembly and a photovoltaic charging control device through bus bars so as to transfer electric energy generated by the photovoltaic cell matrix.

The photovoltaic junction box is provided with the threading hole, and the bus bar is penetrated into the threading hole through manual in the related art, and because the bus bar size and the threading hole size are small, the manual operation space is small, and partial deformation of the bus bar is easy to cause.

Disclosure of Invention

The embodiment of the utility model provides a photovoltaic junction box and a photovoltaic power generation system, which are simpler to operate when a bus bar is arranged in a penetrating way.

On one hand, the embodiment of the utility model provides a photovoltaic junction box, which comprises a box body, a diode and two conducting strips,

the box body is internally provided with a containing cavity, the diode and the two conducting strips are arranged in the containing cavity, and the two conducting strips are electrically connected through the diode;

the box body is provided with a threading hole communicated with the accommodating cavity, and the threading hole is used for threading the bus bar; the box body is further provided with a guide surface, the guide surface is located on one side, far away from the accommodating cavity, of the threading hole, and when the bus bar is arranged in a penetrating mode, the guide surface is used for guiding the end portion of the bus bar to the threading hole.

In some embodiments, the guide surface includes a plurality of sub-guide surfaces, and the plurality of sub-guide surfaces are disposed along a circumferential direction of the threading hole.

In some embodiments, a plurality of the sub-guide surfaces are connected in sequence, and the plurality of sub-guide surfaces encircle the threading hole.

In some embodiments, a smooth transition is provided between two adjacent sub-guide surfaces.

In some embodiments, the sub-guide surface is an arcuate surface.

In some embodiments, along the direction of keeping away from the holding chamber, the box body is equipped with in proper order the through wires hole with the guiding hole intercommunication, the pore wall in guiding hole forms the guide surface.

In some embodiments, the partial region of the bottom wall of the box body is recessed toward the direction of the accommodating cavity to form the guide hole and the threading hole.

In some embodiments, the box body is provided with two threading holes and two guiding holes, and the threading holes and the guiding holes are in one-to-one correspondence.

In some embodiments, the conductive sheet is provided with a fixing hole, and the threading hole is opposite to the fixing hole.

In another aspect, a photovoltaic power generation system is provided that includes the photovoltaic junction box, a photovoltaic module, and a bus bar connecting the photovoltaic junction box and the photovoltaic module.

According to the photovoltaic junction box and the photovoltaic power generation system provided by the embodiment of the utility model, the box body is also provided with the guide surface corresponding to the threading hole, the guide surface is positioned at one side of the threading hole away from the accommodating cavity, and the guide surface is used for guiding the end part of the bus bar towards the threading hole when the bus bar is threaded. In the process of penetrating the bus bar into the threading hole, after the end part of the bus bar is contacted with the guide surface, the end part of the bus bar can enter the threading hole more easily under the guide of the guide surface, so that the threading difficulty is reduced. And, under the guide of guide surface, the tip of busbar is difficult to take place the extrusion with the diapire of box body to the risk that the busbar takes place bending deformation has been reduced.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a photovoltaic junction box according to an embodiment of the present utility model;

FIG. 2 is an enlarged view of a portion of the photovoltaic junction box of FIG. 1;

fig. 3 is a bottom view of a photovoltaic junction box according to an embodiment of the present utility model;

fig. 4 is a schematic box body diagram of a photovoltaic junction box according to an embodiment of the present utility model.

Reference numerals:

100-photovoltaic junction box;

110-a box;

110 a-upper case;

110 b-lower case;

111-threading holes;

112-a guide surface;

120-conducting strips;

130-a diode;

140-cables;

150-connectors.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the embodiments of the present utility model, the words "first", "second", "third", "fourth", etc. are used to distinguish identical items or similar items that have substantially the same function and function, and are only used to clearly describe the technical solutions of the embodiments of the present utility model, and they are not to be interpreted as indicating or implying relative importance or implying that the number of technical features indicated is indicated.

In embodiments of the utility model, the meaning of "a plurality of" means two or more, and the meaning of "at least one" means one or more, unless specifically defined otherwise.

In the embodiments of the present utility model, the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description and simplification of description, and are not indicative or implying that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.

In a photovoltaic power generation system, a photovoltaic junction box is electrically connected with a photovoltaic module matrix formed by photovoltaic modules and a photovoltaic charging control device through bus bars so as to transfer electric energy generated by the photovoltaic module matrix.

As shown in fig. 1 to 4, the embodiment of the present utility model provides a photovoltaic junction box 100, and the photovoltaic junction box 100 includes a box body 110, a diode 130, and two conductive sheets 120. The box 110 is provided with a containing cavity, the diode 130 and the two conductive plates 120 are installed in the containing cavity, and the two conductive plates 120 are electrically connected through the diode 130. The box 110 is provided with a threading hole 111 communicated with the accommodating cavity, and when in use, the end part of the bus bar penetrates into the accommodating cavity through the threading hole 111 and is electrically connected with the conducting strip 120.

The box body 110 serves as a skeleton of the photovoltaic junction box 100 for connecting and supporting other components of the photovoltaic junction box 100. The box 110 may be provided with a receiving cavity, in which the conductive sheet 120 and the diode 130 are located, so as to prevent the conductive sheet 120 and the diode 130 from being affected by external impact, corrosion, etc. and to connect reliability. Two conductive sheets 120 may be disposed in the case 110, and the two conductive sheets 120 are connected through a diode 130 to achieve unidirectional current conduction.

The box 110 may be provided with a threading hole 111, and one end of the bus bar penetrates into the accommodating cavity of the box 110 through the threading hole 111 and then is connected with the conductive sheet 120.

Illustratively, the case 110 may be provided with a first threading hole corresponding to one conductive sheet 120 and a second threading hole corresponding to the other conductive sheet 120. One bus bar is electrically connected with one of the conductive sheets 120 through the first threading hole, and the other bus bar is electrically connected with the other conductive sheet 120 through the second threading hole. That is, the case 110 is provided with two threading holes 111 and two guide holes, and the threading holes 111 and the guide holes are in one-to-one correspondence.

Illustratively, the case 110 includes an upper case 110a and a lower case 110b, the upper case 110a and the lower case 110b are buckled to form a containing cavity, a bottom wall of the lower case 110b is provided with a threading hole 111, and a bus bar extends along the bottom wall of the lower case 110b and is bent at the threading hole 111 and penetrates into the case 110.

The material of the case 110 may be an insulating material such as ppe+ps, PPE 540Z, or PPE 644Z. Of course, the case 110 may be made of metal, and insulation from the bus bar and the conductive sheet 120 may be achieved by structural arrangement or arrangement of an insulation layer.

The length, width and height of the box 110 may be 72×30.9×15.3mm. Of course, the size of the case 110 is not limited in the present utility model, and may be flexibly selected according to practical situations.

The bus bar is used for electrically connecting a photovoltaic module matrix formed by the photovoltaic modules and a photovoltaic charging control device. To make electrical connection, the bus bar may include a body and a solder layer covering a surface of the body. The body may be made of metal (e.g., copper, aluminum, etc.), and the solder layer may include solder.

The bus bars may be elongated in cross-section (e.g., rectangular, oval, kidney-shaped, etc.), and may also be circular in some embodiments.

In the related art, the bus bar is manually threaded into the threading hole 111, and the bus bar is easily deformed due to small manual operation space caused by small bus bar size and small threading hole 111 size.

In view of this, in the embodiment of the present utility model, the case 110 is further provided with a guiding surface 112, the guiding surface 112 is located on a side of the threading hole 111 away from the accommodating cavity, and the guiding surface 112 is used for guiding an end of the bus bar towards the threading hole 111 when the bus bar is threaded. In the process of penetrating the bus bar into the threading hole 111, after the end part of the bus bar is contacted with the guide surface 112, the end part of the bus bar is easier to enter the threading hole 111 under the guide of the guide surface 112, so that the threading difficulty is reduced. And, the end of the bus bar is not easily pressed with the bottom wall of the case 110 under the guide of the guide surface 112, thereby reducing the risk of bending deformation of the bus bar.

In some embodiments, the guide surface 112 includes a plurality of sub-guide surfaces disposed along the circumference of the threading hole 111. The plurality of sub-guide surfaces are arranged along the circumference of the threading hole 111, so that the threading hole 111 comprises sub-guide surfaces in a plurality of directions, namely, the guide surfaces 112 can guide the bus bar in a plurality of directions, and the requirements on the posture of the bus bar when the bus bar is threaded are lower, and the operation is more convenient.

In some embodiments, the plurality of sub-guide surfaces are connected in sequence, and the plurality of sub-guide surfaces encircle the threading hole 111. The plurality of sub-guide surfaces are provided around the threading hole 111 so that the guide surfaces 112 can guide the bus bar in various directions of the threading hole 111 circumference, further reducing the operational difficulty of threading the bus bar.

In some embodiments, the transition between two adjacent sub-guide surfaces is smooth. In the process of penetrating the bus bar, when the part of the bus bar structure is contacted with the transition part between the two sub-guide surfaces, the transition part is smooth, so that friction between the bus bar and the guide surface 112 can be reduced, and the bus bar can enter the threading hole 111 along the guide surface 112 more easily. The sub-guide surfaces may be smooth transition, or may be smooth transition between some sub-guide surfaces, which is not limited in the embodiment of the present utility model.

Illustratively, a rounded corner is provided between two adjacent sub-guide surfaces.

In some embodiments, the sub-guide surfaces are arc surfaces, which may reduce friction between the bus bar and the guide surface 112, making it easier for the bus bar to enter the threading hole 111 along the guide surface 112. Wherein, can be all sub-guide surfaces are arc surfaces, also can be some sub-guide surfaces are arc surfaces, this embodiment of the utility model is not limited to this.

In some embodiments, in a direction away from the accommodating cavity, the box 110 is sequentially provided with a threading hole 111 and a guiding hole, the threading hole 111 is communicated with the guiding hole, and a hole wall of the guiding hole forms a guiding surface 112. Illustratively, the size of the threading hole 111 is larger than that of the guide hole so that the bus bar is more easily penetrated into the guide hole to smoothly enter the threading hole 111 under the guide of the guide hole. Illustratively, the pilot hole is flared with a small dimension toward the end of the receiving cavity and a large dimension away from the end of the receiving cavity.

In some embodiments, a portion of the bottom wall of the case 110 is recessed toward the receiving cavity to form a guide hole and a threading hole 111. The size of the case 110 can be reduced by recessing the case 110 toward the receiving chamber to form the guide hole and the threading hole 111.

After the bus bar is connected to the photovoltaic junction box 100, the bus bar may include a portion located outside the box body 110 and a portion penetrating into the box body 110.

Illustratively, one end of the bus bar extends along the bottom wall of the case 110, is bent at the threading hole 111, and penetrates into the case 110. The portion extending along the bottom wall is a portion located outside the case 110, and the portion penetrating into the case 110 after bending is a portion penetrating into the case 110.

Illustratively, the conductive sheet 120 is provided with a fixing hole, the threading hole 111 is opposite to the fixing hole, and a portion of the bus bar penetrating into the case 110 is threaded into the fixing hole to limit the degree of freedom of the bus bar.

The fixing holes can be through holes or blind holes. For example, when the length of the bus bar penetrating the case 110 part is easily determined, a blind hole of a fixed depth may be provided according to the length of the bus bar penetrating the case 110 part, and when the length of the bus bar penetrating the case 110 part is not easily determined, in order to prevent the end of the bus bar from abutting against the bottom wall of the blind hole to cause bending of the bus bar, the fixing hole may be provided as a through hole.

In some embodiments, the conductive sheet 120 is plate-shaped, and the fixing hole is a through hole penetrating the conductive sheet 120. Illustratively, the fixing holes are punched in the conductive sheet 120 by punching. The conductive sheet 120 is plate-shaped, so that the material consumption of the conductive sheet 120 can be saved and the cost can be reduced under the condition that the conductive sheet 120 is electrically connected with the bus bar.

Optionally, in some embodiments, an avoidance space is provided between the conductive sheet 120 and the inner wall of the case 110, and a portion of the bus bar is located in the avoidance space. An avoidance space is formed between the conductive sheet 120 and the inner wall of the case 110, that is, an avoidance space is formed between the fixing hole and the inner wall of the case 110, so that when the length of the bus bar penetrating into the case 110 is not easy to determine, the bus bar can be prevented from interfering with the case 110 after penetrating through the fixing hole.

Alternatively, in some embodiments, the bus bar is welded to the fixing hole. The bus bar and the fixing hole are welded, so that the bus bar and the fixing hole are fixedly connected, the bus bar and the fixing hole can be electrically connected, and the reliability of the bus bar and the conductive sheet 120 in electrical connection is improved.

Further, in some embodiments, a solder layer is filled between the bus bar and the inner wall of the fixing hole. The soldering tin layer is filled between the inner wall of the fixing hole and the bus bar, so that the connection between the bus bar and the fixing hole is firmer. Illustratively, the cross-sectional dimension of the fixing hole is larger than the cross-sectional dimension of the bus bar, and after the bus bar is inserted into the fixing hole, the gap between the bus bar and the fixing hole is filled with solder, and the solder is melted by heating the bus bar, thereby realizing welding.

Alternatively, the fixing hole may be a rectangular fixing hole, a kidney-shaped fixing hole, or an oval fixing hole. The shape of the fixing hole can be flexibly selected according to the shape of the bus bar, for example, when the cross section of the bus bar is rectangular, the fixing hole can be rectangular, and when the cross section of the bus bar is waist-shaped, the fixing hole can be waist-shaped. Of course, when the cross section of the bus bar is rectangular, the fixing hole may be waist-shaped, oval, etc., and so on.

Optionally, when the fixing hole is a rectangular fixing hole, the size of the fixing hole is 7×2mm. In the practical application process, the cross-sectional dimension of the bus bar is usually smaller than 7 x 2mm, so that the size of the fixing hole is set to 7 x 2mm, the bus bar can be ensured to be easily inserted into the fixing hole, the bus bar cannot be fixed by the fixing hole caused by overlarge size of the fixing hole, and the fixing hole and the bus bar are not easy to weld.

Optionally, the junction box further includes a connector 150, where the connector 150 is used for external electrical connection, and the connector 150 is connected to the conductive sheet 120 through a cable 140. The material of the housing of the connector 150 may be PPE, PA66, PO, PC, or the like.

On the other hand, the embodiment of the utility model also provides a photovoltaic power generation system, which comprises a photovoltaic junction box 100, a photovoltaic module and a bus bar for connecting the photovoltaic junction box 100 and the photovoltaic module.

In the photovoltaic power generation system provided by the embodiment of the utility model, the box body 110 of the photovoltaic junction box 100 is further provided with the guide surface 112 corresponding to the threading hole 111, the guide surface 112 is positioned at one side of the threading hole 111 away from the accommodating cavity, and the guide surface 112 is used for guiding the end part of the bus bar towards the threading hole 111 when the bus bar is threaded. In the process of penetrating the bus bar into the threading hole 111, after the end part of the bus bar is contacted with the guide surface 112, the end part of the bus bar is easier to enter the threading hole 111 under the guide of the guide surface 112, so that the threading difficulty is reduced. And, the end of the bus bar is not easily pressed with the bottom wall of the case 110 under the guide of the guide surface 112, thereby reducing the risk of bending deformation of the bus bar.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. A photovoltaic junction box is characterized by comprising a box body, a diode and two conducting strips,

the box body is internally provided with a containing cavity, the diode and the two conducting strips are arranged in the containing cavity, and the two conducting strips are electrically connected through the diode;

the box body is provided with a threading hole communicated with the accommodating cavity, and the threading hole is used for threading the bus bar; the box body is further provided with a guide surface, the guide surface is located on one side, far away from the accommodating cavity, of the threading hole, and when the bus bar is arranged in a penetrating mode, the guide surface is used for guiding the end portion of the bus bar to the threading hole.

2. The photovoltaic junction box according to claim 1, wherein the guide surface includes a plurality of sub-guide surfaces, the plurality of sub-guide surfaces being disposed along a circumferential direction of the threading hole.

3. The photovoltaic junction box according to claim 2, wherein a plurality of the sub-guide surfaces are connected in sequence, and a plurality of the sub-guide surfaces encircle the threading hole.

4. A photovoltaic junction box according to claim 3, wherein there is a smooth transition between two adjacent sub-guiding surfaces.

5. A photovoltaic junction box according to claim 3, wherein the sub-guiding surface is an arc surface.

6. The photovoltaic junction box according to any one of claims 1 to 5, wherein the box body is provided with the threading hole and the guide hole in order along a direction away from the accommodation cavity, the threading hole and the guide hole are communicated, and a hole wall of the guide hole forms the guide surface.

7. The photovoltaic junction box according to claim 6, wherein the partial region of the bottom wall of the box body is recessed toward the accommodating chamber to form the guide hole and the threading hole.

8. The photovoltaic junction box according to claim 6, wherein the box body is provided with two threading holes and two guiding holes, and the threading holes and the guiding holes are in one-to-one correspondence.

9. The photovoltaic junction box according to any one of claims 1 to 5, wherein a fixing hole is provided on the conductive sheet, and the threading hole is directly opposite to the fixing hole.

10. A photovoltaic power generation system comprising the photovoltaic junction box according to any one of claims 1 to 9, a photovoltaic module, and a bus bar connecting the photovoltaic junction box and the photovoltaic module.