CN218183300U

CN218183300U - Photovoltaic junction box and photovoltaic power generation system

Info

Publication number: CN218183300U
Application number: CN202221708560.9U
Authority: CN
Inventors: 孔国寿; 介雷; 王建明; 刘勇
Original assignee: Das Solar Co Ltd
Current assignee: Yidao New Energy Technology Co ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2022-12-30
Anticipated expiration: 2032-07-01

Abstract

The application 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 wiring piece and a bus bar; the wiring piece is positioned in the box body, and a fixing hole is formed in the wiring piece; the bus bar comprises a welding part and a tail end bending part, the welding part is welded with the wiring piece, and at least part of the bending part is inserted into the fixing hole to fix the bending part.

Description

Photovoltaic junction box and photovoltaic power generation system

Technical Field

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

Background

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

In the related art, the photovoltaic junction box and the bus bar are electrically connected by welding. The photovoltaic junction box comprises a wiring piece, and a tin block is arranged on the wiring piece. When welding, the tail end of the bus bar is lapped on the tin block, and then the bus bar is heated to melt the tin block, so that the bus bar and the wiring piece are welded.

However, cold joint is likely to occur during soldering.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a photovoltaic junction box and a photovoltaic power generation system, which are used for at least partially solving the technical problem.

In one aspect, the present application provides a photovoltaic junction box comprising a box body, a junction piece, and a bus bar; the wiring piece is positioned in the box body, and a fixing hole is formed in the wiring piece; the bus bar comprises a welding part and a terminal bending part, the welding part is welded with the wiring piece, and at least part of the bending part is inserted into the fixing hole to fix the bending part.

Optionally, the bent portion is welded to the fixing hole.

Optionally, a first solder layer is filled between the bending part and the inner wall of the fixing hole.

Optionally, a second solder layer is provided between the solder portion and the wire connector.

Alternatively, the fixing hole may be a rectangular fixing hole, a kidney-shaped fixing hole, or an oval fixing hole.

Optionally, when the fixing hole is a rectangular fixing hole, the size of the fixing hole is 7 x 2mm.

Optionally, the wire connecting piece is plate-shaped, and the fixing hole is a through hole penetrating through the wire connecting piece.

Optionally, an avoiding space is arranged between the wiring piece and the inner wall of the box body, and part of the bending part is located in the avoiding space.

Optionally, the box body is provided with a threading hole; the bus bar is in the pinhole department is buckled and is penetrated in the box body, the bus bar that penetrates in the box body is buckled the back and is formed with the welding part that the wiring spare is parallel, the terminal orientation of bus bar the fixed orifices is buckled and is formed the kink.

In another aspect, the present application provides a photovoltaic power generation system, including the photovoltaic junction box.

In this application embodiment, be equipped with the fixed orifices on the wiring piece, the busbar is equipped with welding part and terminal kink, and the welding part welding realizes the electricity to connect on the wiring piece, and terminal kink at least part inserts in the fixed orifices. Because the terminal kink of busbar is fixed at least partially in the fixed orifices, that is to say that the busbar is terminal to link together with the wiring piece, the wiring piece can not be kept away from to the busbar because of the elasticity of self, makes the distance between welding part and the wiring piece more controllable, has solved the rosin joint problem between busbar and the wiring piece.

Drawings

Fig. 1 is a sectional view of a photovoltaic junction box in the related art;

FIG. 2 is a cross-sectional view of an embodiment of a photovoltaic junction box provided herein;

FIG. 3 is an enlarged view of a portion of FIG. 2 taken about I;

FIG. 4 is an assembly view of a box body and wire connectors in one embodiment of a photovoltaic junction box provided herein;

FIG. 5 is a bottom view of a box body in an embodiment of a photovoltaic junction box provided herein;

fig. 6 is another photovoltaic junction box embodiment provided herein.

Reference numerals:

1-box body; 2-bus bar, 3 wiring piece;

10-a box body;

10 a-a threading hole;

20-a bus bar;

21-bending part;

22-a weld;

30-a wiring piece;

30 a-a fixation hole;

31-a second solder layer;

32-a first solder layer;

a 40-diode;

50-connector.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

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

Fig. 1 is a cross-sectional view of a photovoltaic junction box in the related art, and as shown in fig. 1, a bus bar 2 penetrates into a box body 1, is bent twice, and then is lapped on a tin block. Bus bar 2 is made by conductive metal (for example copper bar surface covering soldering tin layer), because metal self has certain elasticity, has certain resilience volume after buckling, consequently the overlap joint bus bar 2 on soldering tin layer be difficult to laminate completely with the soldering tin piece, interval between bus bar 2 and the connector lug 3 is too big promptly, lead to the solder block to melt the back and can not connect bus bar 2 and connector lug 3 to the rosin joint phenomenon appears.

In view of this, this application provides a photovoltaic terminal box and photovoltaic power generation system, sets up the fixed orifices on the binding clip, fixes the end of busbar in the fixed orifices to prevent the rosin joint phenomenon that busbar and binding clip apart from too big result in.

The photovoltaic junction box and the photovoltaic system provided by the application are described in detail below with reference to the accompanying drawings.

FIG. 2 is a cross-sectional view of an embodiment of a photovoltaic junction box provided herein; FIG. 3 is an enlarged view of a portion of FIG. 2 taken about I; FIG. 4 is an assembly view of a box body and wire connectors in one embodiment of a photovoltaic junction box provided herein; fig. 5 is a bottom view of a box body in an embodiment of a photovoltaic junction box provided by the present application.

As shown in fig. 1 to 5, the present application provides a photovoltaic junction box including a box body 10, a junction piece 30, and a bus bar 20.

The box body 10 serves as a framework of the photovoltaic junction box and is used for connecting and supporting other parts of the photovoltaic junction box. An accommodation chamber may be provided in the case body 10, and a connection point of the wire connecting member 30 and the bus bar 20 is located in the accommodation chamber to prevent the connection point from being affected by external impact, corrosion, etc. Specifically, the box body 10 may be provided with a threading hole 10a, and one end of the bus bar 20 is connected to the wiring member 30 after penetrating into the accommodating cavity of the box body 10 through the threading hole 10 a.

Exemplarily, the box body 10 includes box body and lower box body, encloses into after last box body and the lower box body lock and holds the chamber, and the diapire of lower box body is equipped with through wires hole 10a, and busbar 20 extends along the diapire of lower box body to buckle and penetrate in the box body 10 in through wires hole 10a department.

The material of the case 10 may be an insulating material such as PPE + PS, PPE 540Z, or PPE 644Z. Of course, the box 10 may be made of metal, and the insulation from the bus bar 20 and the wire connecting member 30 may be achieved by structural arrangement or arrangement of an insulating layer.

The length, width and height of the box body 10 can be 66.5 x 23.9 x 18.1mm. Of course, the size of the box 10 is not limited in the present application, and can be flexibly selected according to the actual situation when the application is specifically applied.

The bus bar 20 is used for electrically connecting a photovoltaic cell matrix formed by the photovoltaic cell modules and the photovoltaic charge control device. To achieve the electrical connection, the bus bar 20 may include a body and a soldering 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 bar 20 may be elongated (e.g., rectangular, oval, kidney-shaped, etc.) in cross-section, and may also be circular in some embodiments.

The bus bar 20 includes a portion located outside the case body 10 and a portion penetrating into the case body 10, and the portion penetrating into the case body 10 includes a welding portion 22 and a bending portion 21. The wire connecting piece 30 is located in the box body 10, and the wire connecting piece 30 is provided with a fixing hole 30a, the welding portion 22 is used for welding with the wire connecting piece 30 to realize the electric connection with the wire connecting piece 30, and the bending portion 21 is used for being at least partially inserted into the fixing hole 30a to limit the freedom degree of the tail end of the bus bar 20. The bus bar 20 is a bar including two ends, and the end located in the box 10 is called a tip.

Optionally, the box body 10 is provided with a threading hole 10a, the bus bar 20 is bent at the threading hole 10a and penetrates into the box body 10, the bus bar 20 penetrating into the box body 10 is bent to form a welding portion 22 parallel to the wire connecting piece 30, and the tail end of the bus bar 20 is bent towards the fixing hole 30a to form a bent portion 21.

Illustratively, one end of the bus bar 20 extends along the bottom wall of the box body 10, bends at the threading hole 10a and penetrates into the box body 10, the part penetrating into the box body 10 is parallel to and close to the wire connecting piece 30 after bending at the wire connecting piece 30, bends towards the fixing hole 30a after extending for a certain distance along the surface of the wire connecting piece 30 to form a bent part 21, and the bent part 21 is at least partially inserted into the fixing hole 30a. The portion of the bus bar 20 parallel to and proximate to the wire connection piece 30 may be a soldering portion 22.

In the embodiment of the present application, the wire connecting member 30 is provided with a fixing hole 30a, the bus bar 20 is provided with a welding portion 22 and a terminal bent portion 21, the welding portion 22 is welded on the wire connecting member 30 to achieve electrical connection, and the terminal bent portion 21 is at least partially inserted into the fixing hole 30a. Because the bent part 21 of the tail end of the bus bar 20 is at least partially fixed in the fixing hole 30a, that is, the tail end of the bus bar 20 is connected with the wiring piece 30, the bus bar 20 cannot be far away from the wiring piece 30 due to the elasticity of the bus bar 20, the distance between the welding part 22 and the wiring piece 30 is more controllable, and the problem of cold joint between the bus bar 20 and the wiring piece 30 is solved.

The fixing hole 30a may be a through hole or a blind hole. For example, when the length of the bent portion 21 is easily determined, a blind hole of a fixed depth may be provided according to the length of the bent portion 21, and when the length of the bent portion 21 is not easily determined, in order to prevent the end of the bent portion 21 from abutting against the bottom wall of the blind hole to cause the soldering portion 22 not to be parallel to the wire member 30, the fixing hole 30a may be provided as a through hole.

Alternatively, in some embodiments, the wire connecting piece 30 has a plate shape, and the fixing hole 30a is a through hole penetrating the wire connecting piece 30. Illustratively, the fixing hole 30a is punched in the wire connecting member 30 by means of punching. By providing the wiring member 30 in a plate shape, the amount of material used for the wiring member 30 can be reduced and the cost can be reduced while ensuring the electrical connection between the wiring member 30 and the bus bar 20.

Optionally, in some embodiments, an avoiding space is provided between the wire connecting member 30 and the inner wall of the box body 10, and the part of the bent portion 21 is located in the avoiding space. An avoiding space is arranged between the wiring piece 30 and the inner wall of the box body 10, namely, an avoiding space is arranged between the fixing hole 30a and the inner wall of the box body 10, so that when the length of the bent part 21 is not easy to determine, the bent part 21 can be prevented from interfering with the box body 10 after penetrating through the fixing hole 30a.

Alternatively, in some embodiments, the bent portion 21 is welded to the fixing hole 30a. The bending portion 21 and the fixing welding not only realize the fixed connection between the bending portion 21 and the fixing hole 30a, but also play a role of electrically connecting the bending portion 21 and the fixing hole 30a when the welding portion 22 and the connecting member are in false welding, thereby increasing the reliability of the electrical connection between the bus bar 20 and the wiring member 30.

Further, in some embodiments, the first solder layer 32 is filled between the bent portion 21 and the inner wall of the fixing hole 30a. The first solder layer 32 is filled between the inner wall of the fixing hole 30a and the bent portion 21, so that the connection between the bent portion 21 and the fixing hole 30a is more secure. For example, the cross-sectional dimension of the fixing hole 30a is larger than the cross-sectional dimension of the bent portion 21, and after the bent portion 21 is inserted into the fixing hole 30a, the gap between the bent portion 21 and the fixing hole 30a is filled with solder, and the solder is melted by heating the bent portion 21, thereby forming the first solder layer 32.

Optionally, in some embodiments, a second solder layer 31 is provided between the solder portion 22 and the wire member 30. Illustratively, a solder bump is provided in a region of the wire member 30 facing the soldering portion 22, the soldering portion 22 is lapped over the solder bump during soldering, and the solder bump is melted by heating the soldering portion 22, thereby forming a second solder layer 31 between the soldering portion 22 and the wire member 30.

In addition, when both the first solder layer 32 and the second solder layer 31 are formed by heating the bus bar 20, the two solder points of the soldering portion 22 and the bent portion 21 can be soldered at the same time when the bus bar 20 is heated, and the number of manufacturing processes can be reduced.

Alternatively, the fixing hole 30a may be a rectangular fixing hole 30a, a kidney-shaped fixing hole 30a, or an oval fixing hole 30a. The shape of the fixing hole 30a may be flexibly selected according to the shape of the bus bar 20, for example, when the cross section of the bus bar 20 is rectangular, the fixing hole 30a may be rectangular, and when the cross section of the bus bar 20 is kidney-shaped, the fixing hole 30a may be kidney-shaped. Of course, when the cross section of the bus bar 20 is rectangular, the fixing hole 30a may be a kidney shape, an oval shape, etc., and so on.

Alternatively, when the fixing hole 30a is a rectangular fixing hole 30a, the size of the fixing hole 30a is 7 x 2mm. In practical application, the sectional dimension of the bus bar 20 is usually smaller than 7 x 2mm, so that the dimension of the fixing hole 30a is set to 7 x 2mm, which can ensure that the bending part 21 can be easily inserted into the fixing hole 30a, and can prevent the fixing hole 30a from being unable to fix the bus bar 20 due to the over-dimension of the fixing hole 30a, and the fixing hole 30a and the bending part 21 are not easy to weld.

In the embodiment of the present application, the photovoltaic junction box may include two wiring pieces 30, two bus bars 20, and a diode 50, the wiring pieces 30 correspond to the bus bars 20 one by one and are electrically connected, and two terminals of the diode 50 are electrically connected to the two wiring pieces 30, respectively, so that the two bus bars 20 are electrically connected through the diode 50.

Optionally, as shown in fig. 6, the junction box further includes a connector 50, the connector 50 is used for external electrical connection, and the connector 50 and the wire connecting member 30 are connected by a cable. The material of the housing of the connector 50 may be PPE, PA66, PO, PC, or the like, and the connector 50 may be compatible with MC4: Φ 19.1mm interface and EVO2: phi 18.8mm interface. The cross-sectional dimension of the cable may be 1 ANGSTROM 4mm ² 。

The application also provides a photovoltaic power generation system, and the photovoltaic power generation system comprises any one of the photovoltaic junction boxes.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "include", "including" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or terminal device including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such process, method, article, or terminal device. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or terminal apparatus that comprises the element.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A photovoltaic junction box is characterized by comprising a box body, a junction piece and a bus bar;

the wiring piece is positioned in the box body, and a fixing hole is formed in the wiring piece;

the bus bar comprises a welding part and a tail end bending part, the welding part is welded with the wiring piece, and at least part of the bending part is inserted into the fixing hole to fix the bending part.

2. The photovoltaic junction box of claim 1, wherein the bent portion is welded to the fixing hole.

3. The photovoltaic junction box of claim 2, wherein a first solder layer is filled between the bent portion and an inner wall of the fixing hole.

4. The photovoltaic junction box of claim 1, wherein a second solder layer is disposed between the solder and the wire connector.

5. The photovoltaic junction box of claim 1, wherein the fixing holes may be rectangular fixing holes, kidney-shaped fixing holes, or oval fixing holes.

6. The photovoltaic junction box of claim 5, wherein the size of the fixing hole is 7 x 2mm when the fixing hole is a rectangular fixing hole.

7. The photovoltaic junction box of claim 1, wherein the wire member is plate-shaped, and the fixing hole is a through hole penetrating the wire member.

8. The photovoltaic junction box of claim 7, wherein an avoidance space is provided between the wire connecting piece and the inner wall of the box body, and part of the bent portion is located in the avoidance space.

9. The photovoltaic junction box of claim 8, wherein the box body is provided with a threading hole; the bus bar is in the pinhole department is buckled and is penetrated in the box body, the bus bar that penetrates in the box body is buckled the back and is formed with the welding part that the wiring spare is parallel, the terminal orientation of bus bar the fixed orifices is buckled and is formed the kink.

10. A photovoltaic power generation system comprising the photovoltaic junction box according to any one of claims 1 to 9.