WO2021208456A1

WO2021208456A1 - Junction box, photovoltaic module and wiring method

Info

Publication number: WO2021208456A1
Application number: PCT/CN2020/133940
Authority: WO
Inventors: 丁威; 何秉轩; 史兴东; 何志富; 朱琛; 吕俊
Original assignee: 泰州隆基乐叶光伏科技有限公司
Priority date: 2020-04-17
Filing date: 2020-12-04
Publication date: 2021-10-21
Also published as: CN111628719A

Abstract

A junction box (220), a photovoltaic module (200) and a wiring method, relating to the technical field of photovoltaics, and aiming to improve the wiring reliability and stability of the junction box (220) so as to ensure the generating capacity and safety of a photovoltaic system. The junction box (220) is used for the photovoltaic module (200) having an outgoing line (L), and comprises: a box body (221) and a terminal board (222) arranged in the box body (221). The box body (221) is provided with a first through hole (2210) used for limiting the outgoing line (L). The terminal board (222) is located on one side of the first through hole (2210), and has a welding region (222Ar) and a ridge structure (223). The ridge structure (223) defines that the flow region of a solder is at the welding region (222Ar). When the junction box (220) is electrically connected to the outgoing line (L), the outgoing line (L) passes through the first through hole (2210) and is welded on the welding region (222Ar). The photovoltaic module (200) comprises the junction box (220), and the junction box (220) is used for photovoltaic power generation.

Description

Junction box, photovoltaic assembly and wiring method

This application requires the priority of a Chinese patent application filed with the Chinese Patent Office with the application number 202010307192.6, titled "a junction box, photovoltaic module and wiring method" on April 17, 2020, and on May 20, 2020 The State Intellectual Property Office, the application number is 202010432467.9, the priority of the Chinese patent application named "a junction box, photovoltaic module and wiring method", the entire content of which is incorporated in this application by reference.

Technical field

The present disclosure relates to the field of photovoltaic technology, and in particular to a junction box, a photovoltaic component and a wiring method.

Background technique

In photovoltaic modules, a junction box connected in parallel to each battery string can be used to connect each battery string in series, so that the current generated by the photovoltaic module is conducted to the external circuit. At the same time, there is a bypass diode in the junction box, which can avoid the hot spot effect of the photovoltaic module and achieve the purpose of protecting the photovoltaic module.

At present, the battery string in the photovoltaic module draws current through lead wires, and the terminal board and lead wires of the junction box are welded together by welding to conduct the current. However, due to many unstable factors during the welding process, the lead wires in the existing photovoltaic modules cannot be accurately welded on the terminal board as required, and virtual welding is prone to occur between the terminal plate and the lead wires. When there is a virtual welding between the terminal board and the lead wire, the photovoltaic module may break down the bypass diode during the working process, and even burn the junction box, which will adversely affect the power generation and safety of the photovoltaic system.

Overview

The purpose of the present disclosure is to provide a junction box, a photovoltaic assembly, and a wiring method to increase the wiring reliability and stability of the junction box, thereby ensuring the power generation and safety of the photovoltaic system.

In a first aspect, the present disclosure provides a junction box. The junction box is applied to photovoltaic modules with lead wires. The junction box includes a box body and a terminal board arranged in the box body. The box body has a first through hole for limiting the lead wire. The terminal board is located on one side of the first through hole. The terminal board has a welding area and a rib structure. The rib structure defines the flux flow area in the welding area. When the junction box and the lead wire are in an electrical connection state, the lead wire passes through the first through hole and is welded to the welding area.

In the case of the above technical solution, during the welding process of the lead wire and the welding area, the first through hole can control the deviation degree of the lead wire in the welding area to ensure that the lead wire can be accurately welded to the welding area of the terminal board according to the requirements. . In addition, during the welding process of the lead wire and the welding area, the flux is easily fluidized by heat, and the rib structure can restrict the flow range of the fluidized flux (that is, define the flux flow area), so that the flow range of the fluidized flux will not exceed Welding area. At this time, under the restriction of the rib structure, there is a thicker fluidized solder between the welding area and the lead wire, thereby reducing the possibility of false welding between the terminal board and the lead wire. It can be seen that the junction box provided by the present disclosure can reduce the possibility of virtual welding between the terminal board and the lead wire under the condition that the wiring position of the lead wire is accurate, thereby improving the wiring stability and reliability of the junction box. This in turn ensures that the photovoltaic system has high power generation and safety. In addition, the rib structure of the terminal board can also be used as a reinforcing rib to increase the strength of the terminal board, so that the terminal board is not prone to deformation, so as to improve the stability and reliability of the junction box from the perspective of structural stability.

In a possible implementation manner, the above-mentioned terminal board may also have a groove located in the welding area. Before the lead wire is welded to the welding area, the solder can be placed in the groove. During the welding process between the lead wire and the welding area, the groove can be used as a tank for holding the flux, which slows down the flow rate of the fluidized flux, so that most of the fluidized flux can be bound in the groove, thereby Reduce the flow range of the fluidized solder to further reduce the possibility of false soldering between the terminal board and the lead wire.

In a possible implementation manner, the depth of the aforementioned groove is greater than or equal to 0.2 mm. At this time, during the welding process of the lead wire and the welding area, under the restraint of the groove structure, the thickness of the fluidized solder can reach 0.2mm or more. In this case, the lead wire can be better welded with the terminal board to further reduce the possibility of false welding.

In a possible implementation manner, the protrusion direction of the above-mentioned rib structure is a direction away from the bottom surface of the box body. The bottom surface of the box body is used to contact the photovoltaic module. That is, when the junction box and the lead wires are in an electrical connection state, the rib structure protrudes in a direction away from the back of the photovoltaic module. The angle formed by the protrusion direction of the rib structure and the plate surface of the terminal board is greater than 0° and less than 180°.

In the case of the above technical solution, the rib structure is inclined upward with respect to the plate surface of the terminal board, which can ensure that the rib structure restricts the flow range of the fluidized flux, so as to prevent the fluidized flux constrained in the welding area from flowing into the rib structure. In other areas of the terminal board, therefore, the protrusion direction of the rib structure can ensure that there is a thicker fluidized solder between the welding area and the lead wire.

In a possible implementation, the angle formed by the protrusion direction of the above-mentioned rib structure and the plate surface of the terminal board is greater than or equal to 45° and less than or equal to 135°.

In the case of adopting the above technical solution, during the welding process of the lead wire and the welding area, the difference between the area of the fluidized flux contacting the welding area and the area of the contact lead wire is relatively small. When the lead wire and the soldering area are soldered, the solder contact area of the lead wire and the solder contact area of the terminal board tend to be equal, so that the upper surface of the solder (that is, the surface where the solder contacts the lead) and the lower surface (that is, the surface where the solder contacts the lead) The force received by the solder contacting the surface of the terminal board is relatively close. At this time, the difference in the force of the solder on the upper surface and the lower surface is relatively small, which helps to make the internal stress distribution of the solder uniform. Therefore, when the lead wire is soldered on the terminal board, the solder is not prone to stress concentration problems. The lead wires are firmly and stably welded to the terminal board, thereby further reducing the possibility of virtual welding between the terminal board and the lead wires.

In a possible implementation manner, the protrusion direction of the above-mentioned rib structure is perpendicular to the surface of the terminal board. At this time, the angle formed by the protrusion direction of the above-mentioned rib structure and the plate surface of the terminal board is equal to 90°.

In the case of adopting the above technical solution, the area of the fluidized solder contacting the welding area is equal to the area of the contact lead wire. Theoretically speaking, when the lead wire and the welding area are welded, the solder will have the same force on the upper and lower surfaces, thereby eliminating the stress concentration problem caused by the difference in the forces on the upper and lower surfaces, and further reducing the terminal board. There is a possibility of virtual welding between the lead wire and the lead wire.

In a possible implementation manner, the height of the above-mentioned rib structure is greater than or equal to 0.2 mm. At this time, in the welding process of the lead wire and the welding area, the thickness of the fluidized flux can reach 0.2mm or more under the restriction of the rib structure. In this case, the lead wire can be better welded with the terminal board to further reduce the possibility of false welding.

In a possible implementation manner, the above-mentioned rib structure includes at least one rib segment. Each edge segment can be a discontinuous edge segment or a continuous edge segment. The extension direction of each edge segment may be a straight line direction, or may be one or a combination of multiple extension directions in a curved direction and a broken line direction.

In a possible implementation, when the at least one edge segment includes two edge segments, and the two edge segments extend along the first direction, it can be considered that the above-mentioned rib structure includes two edges extending along the first direction. part. The two edge segments are arranged on the terminal board at intervals along the second direction, and the welding area is located between the two edge segments. The first direction may be the extending direction of each edge segment on the terminal board, and the second direction may be the distribution direction of the two edge segments on the terminal board. When the junction box and the lead wires are in an electrical connection state, the first direction may be the same as the extension direction of the lead wires on the terminal board.

In the case of the above technical solution, when the welding area is located between the two edge segments, if the lead wire passes through the first through hole and extends along the first direction into the welding area welded between the two edge segments. When the lead wire is welded to the welding area, the two ribs can restrict the flow range of the fluidized solder in the second direction, so that the fluidized solder tends to follow the extension direction of the lead wire in the terminal board (that is, the first direction). ) Flow to prevent the fluidized solder from flowing to both sides of the terminal board along the second direction. At this time, the lead wire and the solder have a larger contact area, which not only makes the lead wire welded on the terminal board firmly and reliably, but also reduces the solder resistance to reduce the power loss caused by the excessive solder resistance.

In a possible implementation, at least one end of each edge segment may be located in the terminal board or flush with the side of the terminal board.

In a possible implementation, the at least one edge segment described above may form an annular convex edge. The above-mentioned welding area is located in the area enclosed by the annular rib.

In a possible implementation manner, when the rib structure includes a rib segment, and the rib segment is not only a continuous rib segment, but also a fully enclosed annular rib segment, the rib structure is a fully enclosed ring Shaped convex edge. The welding area is located in the area enclosed by the fully enclosed annular rib. When the lead wire and the welding area are welded, the fluidized flux will not diffuse in all directions of the terminal board with the welding area as the center under the restriction of the fully enclosed annular rib, which can further improve the lead wire and the terminal board. Welding stability and reliability, reduce the possibility of false welding between the two.

In a possible implementation manner, the above-mentioned annular convex edge is a semi-closed annular convex edge. At this time, the above-mentioned welding area is located in the area enclosed by the semi-closed annular rib.

In the case of adopting the above technical solution, the semi-closed annular rib can be regarded as an annular rib with one or more openings. The spatial position relationship between these openings and the first through holes can be selected according to actual needs. For example, when the opening is close to the first through hole, the lead wire can extend into the welding area through the opening. Without being close to the first through hole, the lead wire can also extend into the welding area across the annular rib.

In a possible implementation manner, the above-mentioned semi-closed annular rib has a gap close to the first through hole. The lead wire passes through the first through hole and the notch and is welded to the welding area. At this time, the gap can be regarded as the opening mentioned above.

In the case of adopting the above technical solution, it can be considered that the above-mentioned rib structure includes an edge segment. The notch is opened on the edge segment, so that the edge segment can be a semi-closed annular edge segment. In this case, the above-mentioned semi-closed annular rib may have a semi-closed annular structure such as C-type or N-type. When the lead wire and the welding area are welded, the semi-closed ring-shaped rib can ensure that the fluidized solder will not diffuse in other directions except for the tendency to diffuse in the direction of the notch, thereby further increasing the gap between the terminal board and the lead wire. The thickness of the fluidized solder can improve the welding stability and reliability of the lead wire and the terminal board, and reduce the possibility of virtual soldering between the two. In addition, when the lead wire passes through the first through hole and is welded to the welding area, the lead wire is bent so that the lead wire extends into the welding area through the notch. Since the notch is close to the first through hole, when the fluidized solder spreads in the direction of the notch, the fluidized solder spreads to the place where the lead wire is bent. Therefore, the place where the lead wire is bent can accumulate thicker. The fluidized soldering flux ensures that the lead wire and the terminal board are firmly welded together, which is beneficial to improve the strength and fatigue resistance of the position where the lead wire is bent, thereby further improving the wiring stability and reliability of the junction box.

In a possible implementation manner, when the above-mentioned semi-closed annular rib includes at least two edge segments, the extension direction of at least one edge segment can be selected so that at least two edge segments form a semi-closed annular rib. At this time, the semi-closed annular rib has at least two voids that can be regarded as the aforementioned openings.

In a possible implementation manner, when the above-mentioned semi-closed annular rib includes two edge segments, the extension direction of the two edge segments can be selected to adjust, so that the two edge segments can form a semi-closed rib. When at least one or two of the two edge segments have a certain curvature, the two edge segments can be formed into a semi-closed annular convex edge. At this time, there is a gap between the two edge segments.

In a possible implementation manner, when the above-mentioned semi-closed annular rib includes at least three edge segments, there is a gap between the ends of two adjacent edge segments.

In the case of adopting the above technical solution, at least three ridge segments can be arranged in the circumferential direction of the welding area around the welding area according to the location requirements of the welding area of the terminal board. Of course, at least three edge segments can also be divided into two groups, and each group of edge segments extends on the terminal board along the first direction mentioned above. And the above-mentioned welding area is located between the two sets of edge segments. At this time, the semi-closed ring-shaped convex edge formed by at least three edge segments can be regarded as an expansion solution of the foregoing two edge segments extending along the first direction on the terminal board.

In a possible implementation manner, the above-mentioned box body further has at least one retaining wall located in the box body. At least one retaining wall is located on the side of the terminal board. Each retaining wall is higher than the board surface of the terminal board with a rib structure. The rib structure includes at least one rib segment. At this time, at least one retaining wall and at least one edge segment enclose the welding area.

In the case of using the above technical solution alone, at least one retaining wall is used as a part of the box body, and at least one edge segment encloses the welding area of the terminal board, so as to reduce the possibility of fluidized solder flowing out of the terminal board by using the retaining wall. In addition, at least one retaining wall is located on the side of the terminal board, so that when the terminal board is not correctly positioned in the box body, the retaining wall can also reduce the degree of deviation of the terminal board in the box body.

In a possible implementation manner, each edge segment is parallel to the wall surface of each retaining wall in the extending direction of the terminal board. Each edge segment is located on the first side of the welding area. Each retaining wall is located on the second side of the welding area. At this time, when the junction box and the lead wires are in an electrical connection state, the extension direction of each edge segment on the terminal board is the same as the extension direction of the lead wires on the terminal board.

In a possible implementation manner, the above-mentioned at least one retaining wall and the box body are an integral structure. At this time, the material of the retaining wall can be the same as the material of the box body, both of which are plastic.

In a possible implementation manner, the above-mentioned terminal board further has at least one positioning structure for limiting the position of the lead wire. The positioning structure can be a protrusion of a pyramid structure, a cylindrical structure, and the like. The protrusion direction of the protrusion is the direction away from the bottom surface of the box body. The bottom surface of the box body is used to contact the photovoltaic module. When the positioning structure is a protrusion, a second through hole can be opened in the structure where the lead wire extends into the welding area. When the welding section extends into the welding area, the second through hole can be used to cover the welding section on the protrusion, so that the protrusion can position the welding section. When the lead wire is welded to the welding area, the positioning of the protrusion can further reduce the possibility of the welding section offset, so that the lead wire can be accurately welded in the welding area as required to further improve the lead wire and the terminal board. Welding reliability and stability. In addition, when the lead wire extends into the welding area by crossing the edge section, the welding section has a tendency to rise up, and the protrusion can restrain the upward tendency of the welding section to a certain extent. Therefore, the protrusion can not only ensure The welding section is accurately welded to the welding area, which can also improve the welding reliability and stability of the welding section and the welding area, so as to further reduce the possibility of false welding of the lead wire and the terminal board.

In some possible implementation manners, in terms of the spatial position relationship between the side wall of the first through hole and the box body, the side wall of the first through hole is perpendicular to the bottom surface of the box body and the top surface of the box body. When the junction box and the lead wires are in electrical connection, the junction box is arranged on the back of the photovoltaic module so that the bottom surface of the box body is in contact with the back surface of the photovoltaic module. If the side walls of the first through hole can both be perpendicular to the bottom surface of the box body and the top surface of the box body, then the first through hole opened in the box body is also perpendicular to the back of the photovoltaic module at this time. In addition, when the lead wire passes through the first through hole and extends into the welding area of the terminal board, the lead wire is constrained by the side wall of the first through hole and will not be greatly deviated in the extending direction of the welding section. Therefore, , The lead wire can be firmly and reliably welded on the terminal board according to the requirements under the restriction of the first through hole.

In a possible implementation manner, the above-mentioned first through hole is a rectangular through hole. Since the side wall of the rectangular through hole is perpendicular to the bottom surface of the box or the back of the photovoltaic module, when the lead wire passes through the rectangular through hole as the first through hole, the possibility of deviation in the rectangular through hole is relatively low, so Ensure that the lead wires can be accurately soldered on the terminal board as required.

In a possible implementation manner, from the perspective of the formation of the side wall of the first through hole, the side wall of the first through hole includes: at least one first limiting surface and at least one second limiting surface.

Each first limit surface is used to restrain the length direction deviation of the lead wire. It should be understood that during the welding process of the lead wire and the welding area, the extension direction of the welding section of the lead wire is substantially the same as the first direction, that is, the extending direction of the edge section mentioned above. Based on this, when the first limit surface restrains the length of the lead wire from deviating, the first through hole can control the welding section within the constraint range of the rib structure mentioned above to ensure accurate welding of the lead wire on the terminal board. sex.

Each second limit surface is used to restrain the lead-out line from deviating in the width direction of the lead-out line. During the soldering process of the lead wire and the welding area, the possibility of the lead wire offset in its width direction is relatively low. Therefore, along the width direction of the lead wire, the lead wire is not easily offset on the terminal board and can be aligned with the terminal. The welding area of the board is accurately aligned, thereby improving the welding stability and reliability of the lead wire and the terminal board.

In a possible implementation manner, each first limit surface is perpendicular to the bottom surface of the box body and the top surface of the box body. The bottom surface of the box body is opposite to the top surface of the box body. The bottom surface of the box body is used to contact the photovoltaic module. In the same way, each second limit surface is perpendicular to the bottom surface of the box body and the top surface of the box body. The bottom surface of the box body is opposite to the top surface of the box body. The bottom surface of the box body is used to contact the photovoltaic module. The effects of the first limiting surface and the effects of the second limiting surface can be referred to the previous related descriptions, which will not be repeated here.

In a possible implementation manner, the aforementioned at least one first limit surface includes two first limit surfaces arranged opposite to each other. At this time, the first limit surface close to the terminal board can prevent the lead wire from excessively extending into the terminal board, so as to ensure that the lead wire and the welding area are welded together, while avoiding the lead wire from excessively extending into the terminal board. The problem of waste. At the same time, the first limit surface away from the terminal board can prevent the lead wire from excessively shifting away from the terminal board, so as to avoid the problem of insufficient extension of the lead wire in the welding area, thereby ensuring reliable welding between the lead wire and the terminal board Sex and stability.

In a possible implementation manner, the at least one second limit surface includes two opposite second limit surfaces. At this time, the two second limit surfaces can control the left and right deviations of the lead wires on the terminal board (along the width direction of the lead wires) to ensure that the lead wires can be welded in the welding area with fluidized solder as required.

In a possible implementation manner, the above-mentioned first limit surface intersects with the second limit surface. The intersection here can be a perpendicular intersection, or an intersection with an angle greater than 0° and less than 90°, as long as the first limit surface and the second limit surface are in a non-parallel state.

In a second aspect, the present disclosure provides a photovoltaic module. The photovoltaic module includes a lead wire and the junction box described in the first aspect or any possible implementation manner of the first aspect. The lead wire passes through the first through hole and is welded to the welding area. For the beneficial effects of the photovoltaic module mentioned in the second aspect, reference may be made to the beneficial effects of the junction box described in the first aspect or any possible implementation of the first aspect.

In a possible implementation manner, the aforementioned lead wire has a welding section that extends deeply into the welding area. The welding section has at least one second through hole. The photovoltaic module also includes solder. The welding flux is riveted to the welding area through the at least one second through hole.

In the case of the above technical solution, during the welding process of the lead wire and the welding area, the fluidized solder can be drained to the surface of the lead wire away from the welding area through the second through hole, so that the solder covers all of the lead wire extending into the welding area Structure or partial structure (for example: tin climbing effect). When the lead wire and the welding area are welded, the solidified flux can act like a riveting piece, so that the welding section is riveted in the welding area.

In addition, during the welding process of the lead wire and the welding area, when the solder covers all or part of the structure of the lead wire extending into the welding area, the second through hole serves as a flow channel for the fluidized solder, so that the second through hole is filled with fluid化 Soldering Flux. In this case, the fluidized flux in the second through hole can restrict the flow range of the fluidized flux below and above the second through hole in the direction of the terminal board surface to further ensure the welding effect of the lead wire and the welding area , So as to better reduce the possibility of false welding between the lead wire and the terminal board.

In a possible implementation manner, when the terminal board included in the above-mentioned junction box has at least one positioning structure located in the welding area, each second through hole is sleeved on the corresponding positioning structure. For the beneficial effects of this technical solution, reference may be made to the beneficial effects of the foregoing positioning structure, which will not be repeated here.

In a possible implementation manner, the aperture of each second through hole is greater than or equal to the maximum radial dimension of the corresponding positioning structure.

In the case of the above technical solution, when the aperture of one or more of the second through holes is greater than or equal to the maximum radial dimension of the corresponding positioning structure, when the second through hole is sleeved on the corresponding positioning structure, the second through hole There is a gap with a certain width between the side wall of the hole and the outer side wall of the positioning structure. At this time, the function of the gap can be referred to the related description above, which will not be described in detail here.

In a possible implementation manner, the at least one second through hole is an open through hole or a closed through hole. For an open through hole, the open through hole can be regarded as a gap opened at the edge of the lead-out line. For a closed through hole, the closed through hole can be regarded as a through hole opened on the lead-out line, and the cross-sectional contour line of the through hole in its radial direction should be a closed contour line.

In a possible implementation manner, the aforementioned lead wire has a welding section extending into the welding area. The surface of the welding section facing the terminal board (referred to as the bottom surface of the welding section) contains a curved surface and/or a serrated surface.

In the case of the above technical solution, during the welding process of the lead wire and the welding area, the flow characteristics of the fluidized solder can be used to make the fluidized solder fully contact the bottom surface of the welding section. Compared with the case where the bottom surface of the welding section is flat, the bottom surface of the welding section contains curved and/or serrated surfaces, which is beneficial to increase the specific surface area of the bottom surface of the welding section. Therefore, compared with the case where the bottom surface of the welding section is flat, the bottom surface of the welding section is The fluidized flux has a relatively large contact area, which can strengthen the welding effect between the welding section and the welding area and reduce the possibility of false welding. In addition, after the lead wire and the welding area are welded, a plurality of curved or zigzag welding parts can be formed between the bottom surface of the welding section and the terminal board. At this time, the curved or zigzag welded portion and the curved and/or zigzag surface of the bottom surface of the welded section cooperate with each other, which can also strengthen the welding effect of the welded section and the welded area to further reduce the possibility of false welding.

In a third aspect, the present disclosure also provides a wiring method, which applies the junction box described in the first aspect or any possible implementation manner of the first aspect. The wiring method includes: providing a photovoltaic module with lead wires; under the condition that the lead wires are restricted by the first through holes, the lead wires extend into the welding area of the terminal board through the first through holes; When the flux flow area is defined in the welding area, the lead wire and the welding area are welded with flux.

In a possible implementation manner, the aforementioned lead wire has a welding section extending into the welding area, and the welding section has at least one second through hole. At this time, using solder to solder the lead wire and the soldering area includes: under the drainage action of the at least one second through hole, the solder flows to the surface of the welding section away from the terminal board, so that the solder passes through at least one of the second through holes. The hole riveted the welded section in the welded area.

In a possible implementation, when the terminal board has at least one positioning structure located in the welding area, and the lead wire extends into the welding area through the first through hole, the ridge structure defines the flux flow area in the welding area. In this case, before the lead wire and the welding area are welded with the flux, the above-mentioned wiring method further includes: sleeve the at least one second through hole of the welding section on the corresponding positioning structure.

The beneficial effects of the wiring method provided by the third aspect or any possible implementation manner may refer to the beneficial effects of the junction box described in the first aspect or any possible implementation manner of the first aspect, and may also refer to the second aspect or the second aspect Any of the possible implementations describes the beneficial effects of photovoltaic modules.

In a fourth aspect, the present disclosure provides a photovoltaic system. The photovoltaic system includes the photovoltaic module described in the second aspect or any possible implementation manner of the second aspect.

The beneficial effects of the photovoltaic system provided by the fourth aspect may refer to the beneficial effects of the junction box described in the first aspect or any possible implementation manner of the first aspect, and may also refer to the description of the second aspect or any possible implementation manner of the second aspect. The beneficial effects of the photovoltaic system.

The above description is only an overview of the technical solutions of the present disclosure. In order to understand the technical means of the present disclosure more clearly, they can be implemented in accordance with the content of the specification, and in order to make the above and other objectives, features and advantages of the present disclosure more obvious and easy to understand. In the following, specific embodiments of the present disclosure are specifically cited.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

The drawings described here are used to provide a further understanding of the present disclosure and constitute a part of the present disclosure. The exemplary embodiments and descriptions of the present disclosure are used to explain the present disclosure, and do not constitute an improper limitation of the present disclosure. In the attached picture:

FIG. 1 is a schematic diagram of a photovoltaic system provided by an embodiment of the disclosure;

FIG. 2 is a three-dimensional schematic diagram of a photovoltaic module provided by an embodiment of the disclosure;

3 is a simplified schematic side view of a photovoltaic module provided by an embodiment of the disclosure;

FIG. 4 is a simplified schematic top view of a junction box provided by an embodiment of the disclosure;

FIG. 5 is a schematic diagram of a possible structure of a junction box provided by an embodiment of the disclosure;

6 is a possible front view schematic diagram of the junction box provided by the embodiment of the disclosure when the terminal board has grooves;

FIG. 7 is a schematic top view of a possible top view of the junction box provided by the embodiments of the present disclosure when the terminal board is provided with grooves; FIG.

8 is a schematic diagram of a possible positional relationship between the rib structure and the terminal board in the embodiment of the disclosure;

9 is a schematic diagram of another possible positional relationship between the rib structure and the terminal board in the embodiment of the disclosure;

FIG. 10 is a possible schematic top view of a junction box provided by an embodiment of the disclosure;

11 is a possible schematic side view of the rib structure and the box body in the embodiment of the disclosure;

FIG. 12 is a possible top view schematic diagram of the rib structure and the box body in the embodiment of the disclosure; FIG.

FIG. 13 is another possible schematic top view of the rib structure and the box body in the embodiment of the disclosure; FIG.

FIG. 14 is another possible schematic top view of the junction box provided by the embodiments of the present disclosure;

FIG. 15 is another possible top view schematic diagram of the junction box provided by the embodiments of the present disclosure;

FIG. 16 is another possible top view schematic diagram of the junction box provided by the embodiments of the disclosure; FIG.

FIG. 17 is a schematic diagram of a first possible distribution of two edge segments on a terminal board in an embodiment of the present disclosure;

18 is a schematic diagram 1 of a second possible distribution of two edge segments on a terminal board in an embodiment of the present disclosure;

19 is a second schematic diagram of the second possible distribution of two edge segments on the terminal board in the embodiment of the disclosure;

20 is the third schematic diagram of the second possible distribution of two edge segments on the terminal board in the embodiment of the disclosure;

21 is a schematic diagram of the expansion mode of two edge segments extending along the first direction on the terminal board in the embodiment of the disclosure;

22 is a schematic top view 1 of the terminal board and the welding section with the second through hole in the welding state in the embodiment of the disclosure;

FIG. 23 is a second schematic top view of the terminal board and the welding section with the second through hole in the welding state in the embodiment of the disclosure; FIG.

FIG. 24 is a schematic front view of a junction box provided by an embodiment of the disclosure in a wiring state;

FIG. 25 is a schematic side view of a junction box provided by an embodiment of the disclosure in a wiring state; FIG.

Figure 26 is a first schematic diagram of wiring between a junction box and a lead wire with a wavy surface provided by an embodiment of the disclosure;

FIG. 27 is a second schematic diagram of the connection between the junction box and the lead wire with wavy surface provided by the embodiment of the disclosure;

FIG. 28 is a flowchart of a wiring method provided by an embodiment of the disclosure.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments These are a part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present disclosure clearer, the following further describes the present disclosure in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, but not used to limit the present disclosure.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present disclosure, "plurality" means two or more than two, unless otherwise specifically defined. The meaning of "several" is one or more than one, unless otherwise specifically defined.

In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. are based on the drawings shown The orientation or positional relationship is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present disclosure.

In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, they can be fixed or detachable. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be a connection between two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present disclosure can be understood according to specific circumstances.

The embodiments of the present disclosure provide a photovoltaic system, which can independently perform photovoltaic power generation functions, and can also be applied to building integrated photovoltaic (Building Integrated Photovoltaic, abbreviated as BIPV), so that the photovoltaic system can not only perform photovoltaic power generation functions, but also serve as a building Part of the object is used. When the photovoltaic system alone performs the power generation function, the photovoltaic system can be located in an open outdoor place. When the photovoltaic system is applied to BIPV, the photovoltaic system can be integrated on the building in the form of flat roof, inclined roof, curtain wall, ceiling, etc.

From the perspective of the use of electric energy delivered by the photovoltaic system, the electric energy generated by the above-mentioned photovoltaic system can be used on-site, or connected to the public grid through a grid-connected inverter, and supply power to users after unified deployment. It should be understood that for photovoltaic systems applied to BIPV, a distributed grid-connection strategy can be adopted to merge into the public grid.

In practical applications, the aforementioned public power grids include but are not limited to photovoltaic systems. For example, the public power grid may also include at least one of different types of power generation systems such as wind power generation systems, thermal power generation systems, and ocean energy power generation systems.

The above-mentioned public power grid may be a global power grid or a local power grid. The coverage area of the local power grid is smaller than that of the global power grid. In a broad sense, these grid coverage areas can be understood as the grid coverage areas divided by regions such as administrative regions, countries or continental plates, and can also be understood as grid coverage areas within the jurisdiction of the national organization formed between countries ( For example, the European Union, the African Union, etc.).

Taking China as an example, the above-mentioned public power grids can be the State Grid, China Southern Power Grid, and Offshore Power Grid. Of course, some of the grid coverage areas listed in the public grid may not appear yet, but it does not rule out the possibility of appearing in future development.

Fig. 1 illustrates a schematic diagram of a photovoltaic system provided by an embodiment of the present disclosure. As shown in FIG. 1, the photovoltaic system 100 may include a plurality of photovoltaic modules 110 electrically connected together. The photovoltaic module 110 may constitute a photovoltaic array module in a rectangular manner. It should be understood that FIG. 1 only illustrates a 4×3 photovoltaic array module composed of 12 photovoltaic modules 110, but there are still fewer or more photovoltaic array modules composed of photovoltaic cells 100 in practical applications.

Fig. 2 illustrates a three-dimensional schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure. As shown in FIG. 2, the photovoltaic module 200 may include a plurality of battery strings 210 electrically connected together. It should be understood that FIG. 2 only exemplifies a photovoltaic module 200 composed of 12 battery strings 210, but there are still photovoltaic modules 200 composed of fewer or more battery strings 210 in practical applications.

Fig. 3 illustrates a simplified schematic side view of a photovoltaic module provided by an embodiment of the present disclosure. As shown in FIG. 3, a plurality of battery strings 210 shown in FIG. 2 can be electrically connected to form photovoltaic cells, which are encapsulated by a cover plate and a back plate. In order to connect different battery module strings, the photovoltaic module further includes one or more junction boxes 220. It should be understood that FIG. 3 only illustrates the relative positional relationship of one junction box 220 in the photovoltaic module 200. In practical applications, the number of the junction boxes 220 can be designed in combination with the photovoltaic module structure and the wiring mode of the distribution junction box in the circuit schematic diagram. At present, it is possible to design a junction box in parallel with one battery in series.

As shown in FIG. 3, the above-mentioned junction box 220 can be arranged on the back side 200B of the photovoltaic module (that is, the surface of the back plate away from the photovoltaic cell) by means of bonding or the like. The junction box 220 may be an integrated junction box or a split junction box. Wherein, when the junction box 220 is a split type junction box, the junction box shown in FIG. 3 is only one of the split type junction boxes. In actual applications, in addition to the one junction box 220 illustrated in FIG. 3, other junction boxes may also be included. It should be understood that when the junction box 220 shown in FIG. 3 is a split junction box, the junction box 220 may be a positive junction box, a negative junction box, or an intermediate junction box. The intermediate junction box can be electrically connected to the positive junction box and the negative junction box.

As shown in FIG. 3, when the above-mentioned junction box 220 is applied to the photovoltaic module 200, the photovoltaic module 200 has a lead wire L electrically connected to the battery string, and is welded and connected with the junction box 220. In addition, the lead wires L that are electrically connected to the battery string often have positive and negative poles, but both the positive lead wires and the negative lead wires can be connected to the junction box 220.

In practical applications, the aforementioned lead wire L may be a solder ribbon such as a bus bar. The solder ribbon can be directly connected to the battery string. In this case, the lead wire L is soldered to the junction box after being drawn from the photovoltaic module. It should be understood that when exemplarily describing the technical solutions provided by the embodiments of the present disclosure below, unless otherwise specified, the lead wire L involved can be a solder ribbon such as a bus bar, or it can be an electrical wire that meets the requirements of the lead wire L. Sexual structure.

It should be understood that those skilled in the art can improve the junction box in the related art based on the core idea of the terminal board provided by the embodiment of the present disclosure and combine the junction box described below to obtain the junction box exemplified in the embodiment of the present disclosure.

As shown in FIG. 3, the junction box 220 provided by the embodiment of the present disclosure includes: a box body 221 and a terminal board 222 provided in the box body 221. Of course, when the junction box 220 may also include a bypass diode, the terminal board 222 may be electrically connected to the bypass diode. The junction box 220 illustrated in FIG. 3 only includes one terminal board 222, but it may also include but is not limited to two terminal boards 222. When the number of terminal boards 222 is multiple, each terminal board 222 should be independent.

As shown in FIG. 3, the box body 221 has a first through hole 2210 for limiting the lead wire L. As shown in FIG. The terminal board 222 is located on one side of the first through hole 2210. The position of the first through hole 2210 on the box body 221 can be selected according to actual conditions. Since the junction box 220 is installed on the back 200B of the photovoltaic module, the bottom surface 221bot of the box body included in the junction box 220 is in contact with the back 200B of the photovoltaic module. The top surface of the box body is opposite to the bottom surface 221bot of the box body. At this time, the top surface of the box body should be parallel to the bottom surface 221bot of the box body. Based on this, when the lead wire L is led to the back side 200B of the photovoltaic module, the first through hole 2210 can be opened at the bottom of the box body 221, so that the lead wire L extends from the bottom surface of the box body 221bot through the first through hole 2210 into the box body 221 within.

As shown in FIG. 3, the above-mentioned terminal plate 222 may be located on one side of the first through hole 2210, so that the structure in which the lead wire L extends into the box body 221 can be directly welded to the terminal plate 222, thereby shortening the length of the lead wire L and avoiding Unnecessary power loss. It should be understood that the shape and material of the terminal board 222 can be adjusted according to conventional technical knowledge in the art, so that the terminal board 222 is suitable for boxes of various shapes, as long as it can conduct current conduction. For example, the terminal plate 222 may be a metal plate made of metal material, and the surface of the metal plate facing the top surface of the box body may be a flat surface to provide a welding plane for the lead wire L.

Fig. 4 illustrates a simplified schematic top view of a junction box provided by an embodiment of the present disclosure. As shown in FIG. 4, the terminal board 222 has a welding area 222Ar and a rib structure 223. It should be understood that the rib structure illustrated in FIG. 4 is only an example, and there may be more rib structures 223.

As shown in FIG. 4, the rib structure 223 defines the flux flow area in the welding area 222Ar. When the junction box 220 and the lead wire L are electrically connected, the lead wire L passes through the first through hole 2210 and is welded to the welding area 222Ar. It should be understood that when the lead wire L is welded to the welding area 222Ar, after the lead wire L passes through the first through hole 2210 and enters the box body 221, the lead wire L can be bent so that the lead wire L can extend into the welding area 222Ar. In addition, the lead wire L and the welding area 222Ar can be welded together with various existing solders. In terms of material, the solder can be solders in various related technologies, including but not limited to tin solders such as solder paste and tin packages, or non-tin solders.

As shown in Figures 3 and 4, during the welding process of the lead wire L and the welding area 222Ar, the first through hole 2210 can control the deviation degree of the lead wire L in the welding area 222Ar to ensure that the lead wire L can be accurately welded as required The terminal plate 222 has a welding area 222Ar. In addition, during the welding process of the lead line L and the welding area 222Ar, the flux is easily fluidized by heat (fluidization can be caused by being softened by heating and showing a flowing state, or it can be melted by heating and showing a flowing state), the rib structure 223 can The flow range of the fluidized flux is restricted (that is, the flux flow area is defined), so that the flow range of the fluidized flux does not exceed the welding area 222Ar. At this time, under the restriction of the rib structure 223, there is a thicker fluidized solder between the welding area 222Ar and the lead line L, thereby reducing the possibility of false welding between the terminal plate 222 and the lead line L. It can be seen that the junction box 220 provided by the embodiments of the present disclosure can reduce the possibility of false welding between the terminal board 222 and the lead wire L while meeting the accuracy of the wiring position of the lead wire L, thereby improving the reliability of the junction box 220. The stability and reliability of the wiring ensure that the photovoltaic system has high power generation and safety.

As shown in FIG. 4, the rib structure 223 of the above-mentioned terminal board 222 can also be used as a reinforcing rib to improve the strength of the terminal board 222, so that the terminal board 222 is not prone to deformation, and improves the stability of the terminal box 220 from the perspective of structural stability. Stability and reliability.

Fig. 5 illustrates a schematic diagram of a possible structure of a junction box provided by an embodiment of the present disclosure. As shown in FIG. 5, in the above-mentioned junction box 220, the box body may include a storage case 2211. The storage case 2211 has a storage groove 2212 in which the terminal board 222 is stored. Potting glue can be filled in the receiving groove 2212 to isolate the adverse effects of external water vapor on the terminal board 222. Of course, the box body 221 may also include a box cover (not shown in FIG. 5) to seal the terminal board 222 in the receiving groove 2212 by using the box cover. It should be understood that the storage shell 2211 and the box cover can be assembled together by a connection method such as a snap connection, a hinge connection, and a magnetic attraction. These connection methods can be used alone or in combination with conventional combinations.

As shown in FIG. 5, the above-mentioned terminal board 222 may be installed in the junction box 220 in a snap connection manner, or may be installed in the junction box 220 in a connection manner by connectors, but it is not limited to this. For example: when the terminal board 222 is set in the junction box 220 in the manner of connecting pieces, the terminal board 222 has one or more mounting holes, and the corresponding box 221 has one or more mounting parts (such as mounting grooves, or Brackets for mounting slots). At this time, connecting parts such as riveting parts, screws, etc. can be inserted and fixed in the mounting part, so that the terminal board 222 is arranged in the junction box 220.

As shown in FIG. 5, the number of the aforementioned terminal boards 222 is two. An insulating wall 224 can also be added between the two terminal boards 222, and the insulating wall 224 is used to reduce the possibility of interference caused by the two terminal boards 222 in the process of conducting current. The box body 221 may adopt boxes of various structures, as long as the terminal board 222 can be accommodated. It should be understood that FIG. 1 only illustrates a part of the structure of the box body 221, and in practical applications, there are various possible implementation manners.

In addition, as shown in FIG. 5, the aforementioned junction box 220 may further include a crimping plate 225. One of the terminal boards 222 may have a wiring bayonet 223a. The crimping plate 225 can snap the terminal of the cable into the receiving shell 2211 and snap it together with the wiring bayonet 223a.

As a possible implementation manner, FIG. 6 illustrates a possible front view schematic diagram of the junction box provided by the embodiment of the present disclosure when the terminal board is provided with grooves. FIG. 7 illustrates a possible top view schematic diagram of the junction box provided by the embodiment of the present disclosure when the terminal board is provided with grooves. As shown in FIGS. 6 and 7, the above-mentioned terminal plate 222 may also have a groove 222b located in the welding area 222Ar. At this time, the groove 222b can be used as a tank for containing solder. The contour of the groove 222b may be a regular pattern such as a regular rectangle or a circle, or may be an irregular closed shape. In addition, when the junction box 220 is provided on the back 200B of the photovoltaic module, the groove 222b may be a groove 222b facing the back 200B of the photovoltaic module.

As shown in FIG. 6 and FIG. 7, before the lead wire L is welded to the welding area 222Ar, the solder can be placed in the groove 222b. When the lead wire L is welded to the welding area 222Ar, the groove 222b can be used as a tank for holding the flux, which slows down the flow rate of the fluidized flux, so that most of the fluidized flux can be bound in the groove 222b, thereby suppressing the flow range of the fluidized solder, so as to further reduce the possibility of false welding between the terminal plate 222 and the lead wire L. For example: when the solder is a tin package, the groove 222b is used as a tin container. Before the lead wire L is welded to the welding area 222Ar, the tin bag is placed in the tin tank. During the welding process of the lead wire L and the welding area 222Ar, the tin bag is heated and softened and fluidized to form a tin liquid, and to the welding area The tendency of 222Ar to spread around. At this time, the tin tank can restrict the flow range of the tin liquid.

As shown in FIGS. 6 and 7, the depth of the groove 222b is greater than or equal to 0.2 mm. At this time, during the welding process of the lead line L and the welding area 222Ar, the thickness of the fluidized solder can reach 0.2 mm or more under the restraint of the structure of the groove 222b. In this case, the lead wire L can be better welded to the terminal board 222 to further reduce the possibility of false welding. For example, the depth of the groove 222b may be equal to 0.2mm, 0.3mm or 0.5mm.

In an example, as shown in FIG. 6 and FIG. 7, on the basis of the above-mentioned rib structure 223, a groove 222b may be provided in the welding area 222Ar, or the area in the groove of the above-mentioned groove 222b may be regarded as the aforementioned The welding area mentioned is 222Ar. The area of the terminal board 222 without the groove 222b swells toward the top surface of the box body, or in a direction away from the bottom surface 221bot of the box body, relative to the area in the groove 222b of the groove 222b. At this time, the area of the terminal plate 222 without the groove 222 b can be regarded as the rib structure 223. The formation of the groove 222 b on the terminal plate 222 is equivalent to the formation of the rib structure 223 on the terminal plate 222.

In an example, as shown in FIGS. 6 and 7, a single molding process may be used to form the groove 222 b in the terminal plate 222. Of course, the rib structure 223 of the terminal board 222 can also be manufactured at the same time in this one-time molding process. The one-time molding process can be a pressing process or a demolding molding process.

As a possible implementation, FIG. 8 illustrates a schematic diagram of a possible positional relationship between the rib structure and the terminal plate in the embodiment of the present disclosure, and FIG. 9 illustrates another type of the rib structure and the terminal plate in the embodiment of the present disclosure. Schematic diagram of possible location relationships. As shown in FIGS. 8 and 9, the protrusion direction U of the above-mentioned rib structure is a direction away from the bottom surface 221bot of the box body. The bottom surface 221bot of the box body is used to contact the photovoltaic module 200. That is, the bottom surface 221bot of the box body is used to contact the photovoltaic panel 210 contained in the photovoltaic module. In other words, the rib structure 223 protrudes in a direction close to the top surface of the box body. Of course, when the junction box 220 and the lead wire L are in an electrical connection state, the rib structure 223 protrudes in a direction away from the back surface 200B of the photovoltaic module.

In an optional manner, as shown in FIGS. 8 and 9, the height h of the above-mentioned rib structure 223 refers to the minimum distance between the top end of the rib structure 223 and the terminal plate 222. When the height h of the rib structure 223 is greater than or equal to 0.2mm, during the welding process of the lead line L and the welding area 222Ar, the rib structure 223 can restrict the flow range of the fluidized solder to increase the thickness of the fluidized solder. To 0.2mm or above. In this case, the thickness of the solder can ensure a good soldering effect between the lead wire L and the terminal plate 222, thereby further reducing the possibility of false soldering.

In addition, as shown in FIGS. 8 and 9, if the thickness of the fluidized solder exceeds the height h of the rib structure 223, the fluidized solder will cross the rib structure 223 and flow into the non-welded area 222Ar of the rib structure 223. Therefore, The height h of the rib structure 223 can determine the thickness of the solder between the lead wire L and the terminal plate 222 and the reliability and stability of the soldering between the two.

In an optional manner, as shown in FIG. 8, the angle α formed by the protrusion direction U of the rib structure and the surface of the terminal board 222 is greater than 0° and less than 180°. At this time, the above-mentioned rib structure 223 is inclined upward with respect to the plate surface of the terminal board 222, so that the length of the rib structure 223 in the convex direction is greater than the height h of the rib structure 223.

As shown in FIG. 8, when the above-mentioned rib structure 223 is obliquely upward with respect to the plate surface of the terminal plate 222, the rib structure 223 can restrict the flow range of the fluidized solder to prevent the fluidized solder constrained in the welding area 222Ar from crossing the convex The rib structure 223 flows into other areas of the terminal plate 222. Therefore, the convex direction of the rib structure 223 can ensure that there is a thicker fluidized solder between the welding area 222Ar and the lead line L.

Exemplarily, as shown in FIG. 8, the angle α formed by the protrusion direction of the rib structure 223 and the surface of the terminal board 222 is greater than or equal to 45° and less than or equal to 135°. For example: 60°, 75°, 115° or 135°, etc.

As shown in FIG. 8, during the welding process of the lead line L and the welding area 222Ar, the difference between the area of the fluidized flux contacting the welding area 222Ar and the area of the contact lead line L is relatively small. Based on this, when the lead wire L is soldered to the welding area 222Ar, the fluidized solder has solidified, and the solder contact area of the lead wire L and the solder contact area of the terminal board 222 tend to be equal, so that the upper surface of the solder ( That is, the force on the surface where the solder contacts the lead wire L and the lower surface (ie, the surface where the solder contacts the terminal plate 222) are relatively close. At this time, the difference in force between the upper and lower surfaces of the solder is relatively small, which helps to make the internal stress distribution of the solder uniform. Therefore, when the lead wire L is soldered to the terminal board 222, the solder is not prone to stress concentration problems. , So that the lead wire L is welded to the terminal plate 222 more firmly and stably, thereby further reducing the possibility of false welding between the terminal plate 222 and the lead wire L.

As shown in FIG. 9, in order to further reduce the possibility of virtual welding between the terminal board 222 and the lead wire L, the protrusion direction of the above-mentioned rib structure 223 is perpendicular to the board surface of the terminal board 222. At this time, the height of the rib structure 223 is h as shown in FIG. 9. Moreover, the length of the rib structure 223 in the convex direction is equal to the height of the rib structure 223.

As shown in FIG. 9, the angle formed by the protrusion direction of the above-mentioned rib structure 223 and the surface of the terminal board 222 is equal to 90°. In this case, the area of the fluidized solder contacting the welding area 222Ar is equal to the area of the contact lead line L. Theoretically, when the lead wire L is welded to the welding area 222Ar, the flux will have the same force on the upper and lower surfaces, thereby eliminating the stress concentration problem caused by the difference in the forces on the upper and lower surfaces, and further reducing There is a possibility of virtual welding between the terminal plate 222 and the lead wire L.

As a possible implementation manner, as shown in FIGS. 10-27, FIG. 3 illustrates that the rib structure 223 may include at least one rib segment D. Each edge segment D can be a discontinuous edge segment or a continuous edge segment. The extension direction of each edge segment may be a straight line direction, or may be one or a combination of multiple extension directions in a curved direction and a broken line direction. It should be understood that when the extension direction of each edge segment is a curved extension direction, the edge segment may be an arc extension direction or a wavy extension direction, but it is not limited to this. As for the forming method of the edge segment D, it can be pressed on the terminal board 222 by a pressing process (for example, a stamping and flanging process), or the edge segment D can be additionally provided on the terminal board 222.

In an optional manner, the rib structure 223 illustrated in FIG. 3 may be a ring-shaped rib. The above-mentioned welding area 222Ar is located in the area surrounded by the annular rib. At this time, at least one edge segment D included in the rib structure 223 may form an annular rib.

In an optional manner, FIG. 10 illustrates a possible top-view schematic diagram of a junction box provided by an embodiment of the present disclosure. As shown in Fig. 10, the rib structure shown in Fig. 3 is a fully enclosed annular rib. The welding area 222Ar is located in an area surrounded by a fully enclosed annular rib. At this time, it can be considered that the rib structure 223 includes a rib D. The edge segment D is not only a continuous edge segment, but also a fully enclosed annular edge segment. It should be understood that the edge segment D may be a ring-shaped edge segment in a broad sense. That is, the ring shape in the ring-shaped edge segment may include a circular ring, an elliptical ring, etc., and may also include a polygonal ring such as a triangular ring, a rectangular ring, and a pentagonal ring, but is not limited to this.

As shown in Figure 10, when the lead wire L is welded to the welding area 222Ar, the fluidized flux will not diffuse in all directions of the terminal board 222 with the welding area 222Ar as the center under the restriction of the fully enclosed annular rib. Therefore, the welding stability and reliability of the lead wire L and the terminal plate 222 can be further improved, and the possibility of false welding between the two can be reduced.

In an optional manner, in order to prevent the fluidized solder from flowing out of the terminal board. FIG. 11 illustrates a possible schematic side view of the rib structure and the box body in the embodiment of the present disclosure. FIG. 12 illustrates a possible schematic top view of the rib structure and the box body in the embodiment of the present disclosure. As shown in FIG. 11 and FIG. 12, the box body 221 also has at least one retaining wall 221Q inside the box body 221. The retaining wall 221Q should be higher than the surface of the terminal board 222 with the rib structure 223. At least one retaining wall 221Q is located on the side of the terminal board 222.

As shown in FIGS. 11 and 12, if the rib structure 223 has at least one opening K facing the at least one retaining wall 221Q, the rib structure 223 is a semi-closed annular rib structure. The rib structure 223 and the at least one retaining wall 221Q are used to define the flux flow area in the welding area 222Ar. Based on this, when the fluidized solder flows from the opening to the outside of the terminal board, the retaining wall 221Q corresponding to the opening can slow down the flow speed of the fluidized solder, so that the retaining wall 221Q cooperates with the rib structure 223 to reduce the flow area of the solder. Defined in the welding area 222Ar.

As shown in FIGS. 11 and 12, the above-mentioned retaining wall 221Q may be the original structure of the box body 221, or it may be a retaining wall provided in the box body 221 that has been manufactured. For example, when the retaining wall 221Q is the original structure of the box body 221, the material of the retaining wall 221Q and the box body 221 may be the same plastic material. At this time, at least one retaining wall and the box body may be an integrated structure. Of course, there may also be cases where the material of the retaining wall 221Q is different from the material of the box body 221. Another example: when the retaining wall 221Q is a retaining wall set in the box body 221 that has been manufactured, various fixing parts can be used to fix the retaining wall 221Q in the box body 221, or an adhesive can be used to bond the retaining wall 221Q to the box body 221. Inside the box 221.

It can be understood that, as shown in FIGS. 11 and 12, each opening K is opposite to the corresponding retaining wall 221Q. Here, one opening K can be opposite to one retaining wall 221Q, or can be opposite to multiple retaining walls 221Q. Prevail. In addition, the side surface of the terminal board 222 may be in contact with the wall surface of at least one retaining wall 221Q, or there may be a gap between the side surface of the terminal board 222 and the wall surface of the retaining wall 221Q.

As shown in Figures 11 and 12, when the terminal board 222 is provided in the box body 221 in a connecting manner, the position of the mounting hole opened by the terminal board 222 can be adjusted so that the terminal board 222 is installed in the box body 221 through the mounting hole In order to ensure that at least one retaining wall 221Q is located on the side of the terminal board 222, the retaining wall 221Q can also reduce the offset degree of the terminal board 222 in the box body 221 when the terminal board 222 is not correctly positioned in the box body 221.

In an example, as shown in FIGS. 11 and 12, when the box body 221 has at least one retaining wall 221Q located in the box body 221, at least one retaining wall 221Q is located on the side of the terminal board 222, if the above-mentioned rib structure When 223 includes at least one edge segment D, the retaining wall 221Q should be higher than the surface of the terminal board 222 with the rib structure 223, and at least one retaining wall 221Q is used as a part of the box body 221, so that at least one retaining wall 221Q and at least one edge segment D encloses the welding area 222Ar. Based on this, the opening K of the above-mentioned rib structure may be provided by at least one rib segment D. At this time, the rib structure 223 is essentially a semi-closed ring rib structure.

For example: as shown in FIG. 12, the above-mentioned rib structure 223 only includes one rib segment D. The strip edge segment is a C-shaped edge segment, so that two ends of the strip edge segment D can form an opening K. When the box body 221 has two retaining walls 221Q located in the box body 221, the opening K faces the direction where the two retaining walls 221Q are located.

In another example, FIG. 13 illustrates another possible schematic top view of the rib structure and the box body in the embodiment of the present disclosure. As shown in FIG. 13, when the box body 221 has at least one retaining wall 221Q inside the box body 221. At least one retaining wall 221Q is located on the side of the terminal board 222. Each edge segment D is parallel to the wall surface of each retaining wall 221Q in the extending direction of the terminal board. Each edge segment D is located on the first side of the welding area 222Ar. Each retaining wall 221Q is located on the second side of the welding area 222Ar. At this time, the welding area 222Ar is located between at least one retaining wall 221Q and at least one edge segment D. At this time, when the junction box 220 and the photovoltaic module are electrically connected together, the extending direction of the edge section D on the terminal board 222 is the same as the extending direction of the lead wire L on the terminal board 222. At this time, the lead line L is located between the edge segment D and the retaining wall.

For example, as shown in FIG. 13, the above-mentioned rib structure includes a rib segment D. At this time, the two ends of the edge segment D can form the aforementioned opening, but the opening can be regarded as a C-shaped opening. The box body 221 has a retaining wall 221Q inside the box body 221. The edge segment D is parallel to the wall surface of the retaining wall 221Q in the extending direction of the terminal board 222, so that the edge segment D is a straight line in the extending direction of the terminal board 222. Moreover, when the junction box 220 and the photovoltaic module 200 are electrically connected together, the extending direction of the edge section D on the terminal board 222 is the same as the extending direction of the lead wire L on the terminal board 222. At this time, the lead line L is located between the edge segment D and the retaining wall 221Q.

In an optional manner, FIG. 14 illustrates another possible schematic top view of a junction box provided by an embodiment of the present disclosure. FIG. 15 illustrates another possible top view schematic diagram of the junction box provided by the embodiment of the present disclosure. As shown in FIGS. 14 and 15, the above-mentioned rib structure 223 is a semi-closed annular rib. At this time, the welding area 222Ar is located in the area surrounded by the semi-closed annular rib. It should be understood that the distribution mode of at least two edge segments on the terminal plate 222 can be arranged according to the position requirements of the welding area 222Ar of the terminal plate 222.

As shown in FIGS. 14 and 15, the above-mentioned semi-closed annular rib can be regarded as one or more openings K (that is, the opening K of the aforementioned rib structure) is opened on the fully closed annular rib D. The spatial position relationship between the openings K and the first through holes 2210 can be selected according to actual needs.

In an example, as shown in FIG. 14, when the opening K is close to the first through hole 2210, the lead wire L may pass through the opening K and extend into the welding area 222Ar. As shown in FIG. 15, when the opening K is not close to the first through hole 2210, the lead-out line L can also extend into the welding area 222Ar across the annular rib.

In an example, FIG. 16 illustrates still another simplified schematic top view of a junction box provided by an embodiment of the present disclosure. As shown in FIG. 16, the semi-closed annular rib has a gap Q close to the first through hole 2210. The lead wire L passes through the first through hole 2210 and the notch Q is welded to the welding area 222Ar. The gap Q can be regarded as the opening K mentioned above.

As shown in FIG. 16, when the semi-closed annular rib has a gap Q close to the first through hole 2210, it can be considered that the rib structure 223 only includes one rib segment D. The notch Q is opened on the edge segment D, so that the edge segment is a semi-closed annular edge segment. In this case, the above-mentioned semi-closed annular rib may have a semi-closed annular structure such as C-type or N-type.

As shown in Figure 16, when the lead wire L is welded to the welding area 222Ar, the semi-closed annular rib can ensure that the fluidized flux will not diffuse in other directions except for the tendency to diffuse in the direction where the gap Q is located. The thickness of the fluidized solder between the terminal plate 222 and the lead-out line L is further increased, the welding stability and reliability of the lead-out line L and the terminal plate 222 are improved, and the possibility of false welding between the two is reduced.

In addition, as shown in FIG. 16, when the aforementioned lead wire L passes through the first through hole 2210 and is welded to the welding area 222Ar, the lead wire L passes through the first through hole 2210 in a bending manner so that the lead wire L can extend through the notch Q. Welding area 222Ar. However, since the notch Q is close to the first through hole 2210, when the fluidized solder spreads in the direction of the notch Q, the fluidized solder spreads to the place where the lead line L is bent, and therefore, the lead line L is bent. The place can accumulate a thicker fluidized solder to ensure that the lead wire L and the terminal board 222 are firmly welded together, which is beneficial to improve the strength and fatigue resistance of the position where the lead wire L is bent, thereby further improving the junction box 220 The stability and reliability of the wiring.

It should be noted that, when the above-mentioned semi-closed annular rib includes at least two edge segments, the extending direction of at least one edge segment can be selected so that at least two edge segments form a semi-closed annular rib. At this time, the structure of the semi-closed annular rib can refer to the related description of FIG. 14 and FIG. 15. In addition, the semi-closed annular rib has at least two voids that can be regarded as the opening K shown in FIGS. 14 and 15. The distribution mode of at least two edge segments on the terminal board can be arranged according to the location requirements of the welding area of the terminal board.

When at least two edge segments of the semi-closed annular rib have at least two voids, the spatial positional relationship between the at least two voids and the first through hole is relatively random. However, the semi-closed annular rib can still achieve the effect achieved by the rib structure mentioned above. For example: at least one of all the voids is close to or toward the first through hole. At this time, the gap can have the function and effect of the notch Q mentioned in FIG. 16.

Exemplarily, FIG. 17 illustrates a first possible schematic diagram of the distribution of two edge segments on the terminal board in an embodiment of the present disclosure. FIG. 18 illustrates a second possible distribution diagram of two edge segments on the terminal board in an embodiment of the present disclosure, and FIG. 19 illustrates a second possible distribution diagram of two edge segments on the terminal board in an embodiment of the present disclosure. As shown in FIGS. 17-19, when the semi-closed annular rib includes two rib segments D, or at least one rib segment included in the rib structure 223 or rib structure 223 shown in FIG. 3 includes two ribs. For segment D, the extension direction of the two edge segments D can be selected so that the two edge segments can form a semi-closed convex edge.

In an example, as shown in FIG. 17, when at least one or two of the two edge segments D have a certain curvature, the two edge segments D can be formed into a semi-closed annular convex edge. As shown in Figures 14 and 15, the semi-closed annular rib has two voids as the opening K mentioned above.

In another example, as shown in FIGS. 18 and 19, two ribs D extend along the first direction A on the terminal plate 222 such that the two ribs D are parallel. At this time, the rib structure 223 formed by the two rib segments D can be regarded as a special case of the semi-closed annular rib. It's just that the semi-closed annular rib in this special case is not a semi-closed annular structure in the general sense. It should be understood that the two convex edges D may extend along the first direction A in a straight line form, and may also extend along the first direction A in a curved form such as an arc or a wavy line. Of course, it can also extend in the first direction in the form of a zigzag line.

As shown in FIGS. 18 and 19, when the two edge segments D are spaced apart on the terminal plate 222 along the second direction B, the welding area 222Ar may be located between the two edge segments D. The second direction B may be the distribution direction of the two edge segments on the terminal plate 222. When the junction box 220 and the lead wire L are in an electrical connection state, the first direction may be the same as the extension direction of the lead wire L on the terminal board 222. It should be understood that the parallelism of the two edge segments D is a kind of generalized parallelism, and the generalized parallelism only needs to ensure that the overall extension directions of the two edge segments D are the same.

In one case, as shown in FIG. 18, the two edge segments D extend in the first direction A in the form of wavy lines. The lead line L extends into the welding area 222Ar between the two ridges extending from the wavy line.

In another case, as shown in FIG. 19, the two edge segments D extend in a straight line in the first direction A, and the lead line L extends into the welding area 222Ar between the two edge segments.

As shown in Figures 18 and 19, regardless of the form of the two edge segments extending in the first direction A, the welding area 222Ar is located between the two edge segments, and the lead line L passes through the first through hole 2210 and extends along the It extends in the first direction A into the welding area 222Ar welded between the two edge segments. When the lead line L is welded to the welding area 222Ar, the two ribs can restrict the flow range of the fluidized solder in the second direction, so that the fluidized solder tends to extend along the lead line L in the extension direction of the terminal plate 222 ( That is, the flow in the first direction A) prevents the fluidized solder from flowing to both sides of the terminal plate 222 along the second direction B. At this time, the lead wire L has a larger contact area with the solder, so that the lead wire L is firmly and reliably welded to the terminal board 222. On this basis, the lead wire L has a larger contact area with the solder, and the resistance of the solder can also be reduced, so as to reduce the power loss caused by the excessive resistance of the solder.

It can be understood that each edge segment D has two ends. At least one end of the edge segment D may be located in the terminal board 222 or flush with the side of the terminal board 222.

FIG. 20 illustrates the third possible distribution diagram of the two edge segments on the terminal board in the embodiment of the present disclosure. As shown in FIG. 20, the terminal board 222 has a left side 222L and a right side 222R distributed along the first direction. The left side 222L is close to the first through hole 2210. Each edge segment D has a first end D1 and a second end D2 distributed along the first direction A. In other words, the first end D1 of each edge segment D is close to the left side 222L of the terminal board 222, and the second end D2 is close to the right side 222R of the terminal board 222.

As shown in FIG. 20, the first end D1 of each edge segment D may be flush with the left side 222L, or may be located in the terminal board 222, that is, the terminal board 222 is located at the first side 222L and the second side. The area between 222R. The second end D2 of each edge segment D can be flush with the right side 222R, or can also be located in the terminal board 222, that is, the terminal board 222 is located between the first side 222L and the second side 222R. area.

Exemplarily, when the above-mentioned semi-closed annular rib includes at least three edge segments, the semi-closed annular rib formed by the at least three edge segments has at least three gaps. At this time, there is a gap between the ends of two adjacent edge segments. The gap here may be the opening K shown in FIG. 15 and FIG. 16. In this case, refer to the previous description of FIG. 15.

In practical applications, FIG. 21 illustrates a schematic diagram of the expansion mode of the two edge segments extending along the first direction on the terminal board in the embodiment of the present disclosure. As shown in FIG. 21, according to the location requirements of the welding area 222Ar of the terminal plate 222, at least three ridge segments can be arranged in the circumferential direction of the welding area 222Ar. Of course, at least three edge segments D can also be divided into two groups, and each group of edge segments D extends on the terminal board 222 along the first direction mentioned above. And the above-mentioned welding area 222Ar is located between the two sets of edge segments. At this time, the semi-closed annular convex edge formed by at least three edge segments D can be regarded as the expansion method of the aforementioned two edge segments D extending along the first direction on the terminal board 222. In this case, when the aforementioned two edge segments D extend along the first direction on the terminal board 222, at least one edge segment D is a discontinuous edge segment. The discontinuous edge segment can be regarded as composed of multiple short edge segments. For the same discontinuous edge segment, the head of one of the short edge segments can be considered to be adjacent to the tail of the other end edge segment, and there is a gap between the two.

In an alternative manner, FIG. 22 is a schematic top view of the terminal board and the welding section with the second through hole in the welding state in the embodiment of the disclosure; FIG. 23 is the terminal board and the second through hole in the embodiment of the disclosure. The top view diagram of the welded section of the hole in the welded state. As shown in FIG. 22 and FIG. 23, regardless of the structure of the above-mentioned rib structure, the above-mentioned terminal board 222 further has at least one positioning structure 226 for limiting the position of the lead wire L. As shown in FIG. The positioning structure 226 can be a protrusion with a pyramid, a cylinder, etc. It should be understood that when the positioning structure 226 is a protrusion, the protrusion direction of the protrusion is away from the bottom surface of the box body 221bot (or toward the top surface of the box body). ) Direction. The bottom surface of the box body 221bot is used to contact the photovoltaic module. The following uses protrusions as an example to describe the process of positioning the lead line L by the positioning structure 226. The following is only for example and not as a limitation.

As shown in FIG. 22, when the positioning structure 226 is convex, at least one second through hole L1 can be opened in the structure (defined as the welding section L0) where the lead line L extends into the welding area 222Ar. From the perspective of whether the second through hole L1 is closed, at least one second through hole L1 is an open through hole or a closed through hole. For an open through hole, the open through hole can be regarded as a gap opened at the edge of the lead line L. For a closed through hole, the closed through hole can be regarded as a through hole opened on the lead line L, and the cross-sectional contour line of the through hole in its radial direction should be a closed contour line. From the outline of the second through hole L1, the shape enclosed by the outline may be a regular or irregular shape, including but not limited to a circle, a triangle, a five-pointed star, an explosion, a star, a C shape, etc.

As shown in FIG. 22, when the welding section L0 extends into the welding area 222Ar, each second through hole L1 can be used to cover the welding section L0 on the corresponding protrusion, so that the protrusion can position the welding section L0. When the lead wire L is welded to the welding area 222Ar, under the positioning of the protrusions, the possibility of offset of the welding section L0 can be further reduced, so that the lead wire L can be accurately welded to the welding area 222Ar as required to further improve the lead The welding reliability and stability of the wire L and the terminal board 222.

In addition, as shown in Fig. 22, when the lead line L does not extend into the welding area 222Ar through the opening K shown in Figs. In the area 222Ar, the welding section L0 has a tendency to rise upward. Based on this, as shown in FIG. 23, the positioning structure 226 such as protrusions can suppress the upward tendency of the welding section L0 to a certain extent. Therefore, the positioning structure 226 such as protrusions can not only ensure that the welding section L0 is accurately connected to the welding area 222Ar. Welding together can also improve the welding reliability and stability of the welding section L0 and the welding area 222Ar, so as to further reduce the possibility of false welding between the lead wire L and the terminal board 222.

As a possible implementation manner, FIG. 24 is a schematic front view of the junction box provided in an embodiment of the disclosure in a wiring state, and FIG. 25 is a schematic side view of the junction box provided in an embodiment of the disclosure in a wiring state. As shown in Figures 24 and 25, from the perspective of the spatial positional relationship between the side wall of the first through hole 2210 and the box body 221, regardless of the rib structure 223, the side wall of the first through hole 2210 can be connected to the box body. The bottom surface 221bot is perpendicular to the top surface of the box body. It should be understood that the spatial position relationship between the bottom surface of the box body 221bot and the top surface of the box body and related descriptions may refer to the foregoing.

As shown in Figures 24 and 25, when the junction box 220 and the lead wire L are in an electrical connection state, the junction box 220 is arranged on the back side 200B of the photovoltaic module so that the bottom surface 221bot of the box body is in contact with the back side 200B of the photovoltaic module. If the side walls of the first through hole 2210 can both be perpendicular to the bottom surface 221bot of the box body and the top surface of the box body, then the first through hole 2210 opened in the box body 221 is also perpendicular to the back surface 200B of the photovoltaic module at this time. In addition, when the lead wire L passes through the first through hole 2210 and extends into the welding area 222Ar of the terminal board 222, the lead wire L is constrained by the side wall of the first through hole 2210 and does not occur in the extending direction of the lead wire L. Due to the large deviation, the lead wire L can be firmly and reliably welded to the terminal board 222 as required under the restriction of the first through hole 2210.

It can be understood that, as shown in FIG. 24 and FIG. 25, the above-mentioned first through hole 2210 is a rectangular through hole. Since the side wall of the rectangular through hole is perpendicular to the bottom surface of the box 221bot or the back surface of the photovoltaic module 200B, when the lead line L passes through the rectangular through hole as the first through hole 2210, the possibility of deviation in the rectangular through hole It is relatively low, so as to ensure that the lead wire L can be accurately welded to the terminal board 222 as required.

As shown in FIGS. 24 and 25, from the perspective of the sidewall of the first through hole 2210, regardless of the rib structure 223, the sidewall of the first through hole 2210 includes: at least one first limiting surface M1 and at least A second limit surface M2.

As shown in FIG. 24 and FIG. 25, each first limit surface M1 is used to suppress the longitudinal deviation of the lead wire L. It should be understood that during the welding process of the lead line L and the welding area 222Ar, the lead line L shown in FIGS. 22 and 23 has the welding section L0 extending in the same direction as the first direction A, that is, the extending direction of the edge section mentioned above. . Based on this, when the first limit surface M1 suppresses the longitudinal deviation of the lead-out line L, the first through hole 2210 can control the welding section L0 shown in FIGS. 22 and 23 to be restricted by the rib structure 223 mentioned above. Within the range, the welding accuracy of the lead wire L on the terminal board 222 is ensured.

Exemplarily, as shown in FIGS. 24 and 25, each first limit surface M1 is perpendicular to the bottom surface 221bot of the box body and the top surface of the box body. The effect of the first limit surface M1 can be referred to the related description above, which will not be repeated here. It should be understood that the spatial position relationship between the bottom surface of the box body 221bot and the top surface of the box body and related descriptions may refer to the foregoing.

As shown in FIG. 24 and FIG. 25, the number of the above-mentioned first limit surface M1 may be two. In other words, the at least one first limiting surface M1 includes two first limiting surfaces M1 arranged opposite to each other. At this time, the first limit surface M1 close to the terminal plate 222 can prevent the lead wire L from excessively extending into the terminal plate 222, so as to ensure that the lead wire L and the welding area 222Ar are welded together while avoiding the lead wire L Excessive extension into the terminal board 222 causes a waste of the lead wire L. At the same time, the first limit surface M1 far away from the terminal plate 222 can prevent the lead wire L from excessively shifting away from the terminal plate 222, so as to avoid the problem of insufficient extension of the lead wire L in the welding area 222Ar, thereby ensuring that the lead wire L and The reliability and stability of the welding between the terminal plates 222.

As shown in FIGS. 24 and 25, each second limit surface M2 is used to suppress the deviation of the lead line L in the width direction of the lead line. During the welding process of the lead wire L and the welding area 222Ar, the possibility of the lead wire L shifting in its width direction is relatively low. Therefore, along the width direction of the lead wire, the lead wire L is not prone to deviation on the terminal board 222. It can be accurately aligned with the welding area 222Ar of the terminal board 222, thereby improving the welding stability and reliability of the lead wire L and the terminal board 222.

Exemplarily, as shown in FIGS. 24 and 25, each second limit surface M2 is perpendicular to the bottom surface 221bot of the box body and the top surface of the box body. For the effect of the second limit surface M2, reference may be made to the previous related description, which will not be repeated here. It should be understood that the spatial position relationship between the bottom surface of the box body 221bot and the top surface of the box body and related descriptions may refer to the foregoing.

As shown in FIGS. 24 and 25, the at least one second limiting surface M2 includes two second limiting surfaces M2 disposed oppositely. At this time, the two second limit surfaces M2 can control the lead-out line L to shift to the left and right of the terminal board 222 (along the width direction of the lead-out line) to ensure that the lead-out line L can be welded to the welding area 222Ar with fluidized flux as required .

It should be noted that, as shown in FIG. 24 and FIG. 25, the above-mentioned first limit surface M1 and the second limit surface M2 intersect. When the first limit surface M1 and the second limit surface M2 intersect perpendicularly, the angle β formed by the first limit surface M1 and the second limit surface M2 is 90°, or an intersection with an angle less than 90° , As long as it is ensured that the first limit surface M1 and the second limit surface M2 are in a non-parallel state.

As shown in FIGS. 24 and 25, when the first limiting surface M1 and the second limiting surface M2 perpendicularly intersect, the first through hole 2210 may be a rectangular through hole. When the intersecting angle between the first limiting surface M1 and the second limiting surface M2 is greater than 0° and less than 90°, the above-mentioned first through hole 2210 may be a diamond-shaped hole.

Based on the above-mentioned junction box structure, as shown in FIGS. 3-25, the photovoltaic module provided by the embodiment of the present disclosure includes a lead wire L and a junction box 220. The lead wire L passes through the first through hole 2210 and is welded to the welding area 222Ar. The beneficial effects of the photovoltaic module can be described with reference to the beneficial effects of the junction box 220 shown in FIGS. 3-25, which will not be detailed here.

As a possible implementation manner, as shown in FIG. 22 and FIG. 23, the aforementioned lead wire L has a welding section L0 extending into the welding area 222Ar. The welding section L0 has at least one second through hole L1. The photovoltaic module also includes solder. The welding flux is riveted to the welding area 222Ar by the welding section L0 through the at least one second through hole L1.

If there is no positioning structure 226 in FIGS. 22 and 23, during the welding process of the lead line L and the welding area 222Ar, the fluidized solder can be drained to the surface of the lead line L away from the welding area 222Ar through the second through hole L1, The soldering agent covers the entire structure or part of the structure of the lead wire L extending into the soldering area 222Ar (for example: tin climbing effect). When the lead wire L is welded to the welding area 222Ar, the solidified flux can act like a riveting piece, so that the welding section L0 is riveted to the welding area 222Ar. In addition, during the welding process of the lead wire L and the welding area 222Ar, when the solder covers the lead wire L and extends into the entire structure or part of the structure of the welding area 222Ar, the second through hole L1 serves as a flow channel for the fluidized solder, so that the second The through hole L1 is filled with fluidized solder. In this case, the fluidized solder in the second through hole L1 can restrict the flow range of the fluidized solder below and above the second through hole L1 in the direction of the plate surface of the terminal plate 222, so as to further ensure the lead line L and welding The welding effect of the area 222Ar can better reduce the possibility of false welding between the lead wire L and the terminal plate 222.

In an optional manner, as shown in FIGS. 22 and 23, when the terminal board 222 included in the junction box 220 has at least one positioning structure 226 located in the welding area 222Ar, each second through hole L1 is sleeved in the corresponding On the positioning structure 226, the specific effect can be referred to the previous related description, which will not be repeated here.

In an optional manner, as shown in FIGS. 22 and 23, the aperture of each second through hole L1 is greater than or equal to the maximum radial dimension of the corresponding positioning structure 226. For example, when the positioning structure 226 is a cylindrical protrusion, the diameter of the second through hole L1 is greater than or equal to the diameter of the cylindrical protrusion.

As shown in Figures 22 and 23, when the diameter of the second through hole L1 is larger than the diameter of the cylindrical protrusion, the second through hole L1 is sleeved on the corresponding positioning structure 226, and the second through hole There is a gap of a certain width between the side wall of L1 and the outer side wall of the positioning structure 226. At this time, the function of the gap can be referred to the related description above, which will not be described in detail here.

In an optional manner, as shown in FIGS. 22 and 23, the at least one second through hole L1 is an open through hole or a closed through hole. For an open through hole, the open through hole can be regarded as a gap Q opened at the edge of the lead line L. For a closed through hole, the closed through hole can be regarded as a through hole opened on the lead line L, and the cross-sectional contour line of the through hole in its radial direction should be a closed contour line.

In an optional manner, FIG. 26 illustrates the first schematic diagram of the connection between the junction box and the lead wire with wavy surface provided by the embodiment of the present disclosure; FIG. 27 illustrates the junction box and the lead wire with wavy surface provided by the embodiment of the present disclosure. The wiring diagram of the line two. As shown in FIGS. 26 and 27, the above-mentioned lead wire L has a welding section L0 extending into the welding area 222Ar. The surface of the welding section L0 facing the terminal board 222 (referred to as the bottom surface of the welding section) contains a curved surface and/or a serrated surface. Of course, the surface of the welding section L0 facing away from the terminal board 222 (referred to as the top surface of the welding section) may be a flat surface, or a curved surface and/or a sawtooth surface. It should be understood that curved surfaces include curved surfaces, wavy surfaces, and the like. Except for the welding section L0 of the lead line L, the surface of the other areas of the lead line L is not limited.

As shown in Figs. 26 and 27, during the welding process of the lead wire L and the welding area 222Ar, the flow characteristics of the fluidized flux can be used to make the fluidized flux fully contact the bottom surface of the welding section. Compared with the case where the bottom surface of the welding section is flat, the bottom surface of the welding section contains curved and/or serrated surfaces, which is beneficial to increase the specific surface area of the bottom surface of the welding section. Therefore, compared with the case where the bottom surface of the welding section is flat, the bottom surface of the welding section is The fluidized flux has a relatively large contact area, which can strengthen the welding effect between the welding section and the welding area 222Ar, and reduce the possibility of false welding. In addition, after the lead wire L is welded to the welding area 222Ar, a plurality of curved or zigzag welding portions SW may be formed between the bottom surface of the welding section and the terminal plate 222. At this time, the curved or zigzag welding part SW matches the curved and/or serrated surface of the bottom surface of the welding section L0, which can also strengthen the welding effect of the welding section L0 and the welding area 222Ar to further reduce the possibility of false welding. sex.

Exemplarily, as shown in FIG. 26, the bottom surface of the welding section L0 has a wavy surface extending along the first direction A. There is a solidified wavy welded part SW between the wavy surface and the wiring board. The wavy surface of the wavy welded portion SW extends along the first direction A. At this time, the wavy surface of the wavy welding portion SW can cooperate with the wavy surface of the bottom surface of the welding section to restrict the flow of the fluidized flux in the first direction during the welding process, thereby achieving the purpose of strengthening the welding effect.

Exemplarily, as shown in FIG. 27, the bottom surface of the welding section has a wavy surface extending along the second direction B. There is a solidified wavy welded part SW between the wavy surface and the wiring board. The wavy surface of the wavy welding portion SW extends along the second direction B. At this time, the wavy surface of the wavy welding portion SW can cooperate with the wavy surface of the bottom surface of the welding section to restrict the flow of the fluidized flux in the second direction during the welding process, thereby achieving the purpose of strengthening the welding effect.

It should be noted that, as shown in Figure 26 and Figure 27, when the bottom surface of the welding section L0 contains curved and/or serrated surfaces, the welding section can also refer to Figures 22 and 23 to open a second through hole L1 to form a similar molten tin Effect to improve welding stability and reliability.

The embodiment of the present disclosure also provides a wiring method. This wiring method can be applied to the junction box 220 shown in FIGS. 3-27. FIG. 28 illustrates a flowchart of a wiring method provided by an embodiment of the present disclosure. As shown in FIG. 28, the wiring method provided by the embodiment of the present disclosure includes:

In step 100, a photovoltaic module with a lead wire L is provided. It should be understood that the lead-out line L of the photovoltaic module is electrically connected to the battery string in the photovoltaic module to conduct current to the junction box 220.

Step 200: When the first through hole 2210 limits the lead wire L, the lead wire L extends into the welding area 222Ar of the terminal board 222 through the first through hole 2210.

Step 300: In the case where the ridge structure 223 defines the flux flow area in the welding area 222Ar, the lead line L and the welding area 222Ar are welded with the flux.

As a possible implementation manner, as shown in FIG. 22 and FIG. 23, the aforementioned lead wire L has a welding section L0 extending into the welding area 222Ar, and the welding section L0 has at least one second through hole L1. At this time, welding the lead wire L and the welding area 222Ar with flux includes: under the drainage action of the at least one second through hole L1, the flux flows to the surface of the welding section L0 away from the terminal plate 222, so that the flux passes through at least one of the The second through hole L1 rivets the welding section L0 to the welding area 222Ar.

As a possible implementation, as shown in FIGS. 22 and 23, when the terminal board 222 has at least one positioning structure 226 located in the welding area 222Ar, after the lead wire L extends into the welding area 222Ar through the first through hole 2210, In the case where the rib structure 223 defines the flux flow area in the welding area 222Ar, before the lead line L and the welding area 222Ar are welded with the flux, as shown in FIG. 28, the above wiring method further includes: step 205: At least one second through hole L1 of L0 is sleeved on the corresponding positioning structure 226.

In the description of the foregoing embodiments, specific features, structures, materials, or characteristics may be combined in any one or more embodiments or examples in an appropriate manner.

The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present disclosure. It should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the objectives of the solutions of the embodiments. Those of ordinary skill in the art can understand and implement it without creative work.

The “one embodiment”, “an embodiment” or “one or more embodiments” referred to herein means that a specific feature, structure or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present disclosure. In addition, please note that the word examples "in one embodiment" here do not necessarily all refer to the same embodiment.

In the instructions provided here, a lot of specific details are explained. However, it can be understood that the embodiments of the present disclosure may be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail, so as not to obscure the understanding of this specification.

In the claims, any reference signs placed between parentheses should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of multiple such elements. The present disclosure can be realized by means of hardware including several different elements and by means of a suitably programmed computer. In the unit claims listing several devices, several of these devices may be embodied in the same hardware item. The use of the words first, second, and third, etc. do not indicate any order. These words can be interpreted as names.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions recorded in the foregoing embodiments are modified, or some of the technical features are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

A junction box, characterized in that it is applied to a photovoltaic module with lead wires; the junction box includes: a box body, and a terminal board arranged in the box body; the box body is used to connect the lead wires The first through hole for limiting the position, the terminal board is located on one side of the first through hole; the terminal board has a welding area, and a rib structure defining the flux flow area in the welding area;

When the junction box and the lead wire are in an electrical connection state, the lead wire passes through the first through hole and is welded to the welding area.
The junction box according to claim 1, wherein the protrusion direction of the rib structure is a direction away from the bottom surface of the box body, and the bottom surface of the box body is used to contact the photovoltaic module; wherein,

The angle formed by the protrusion direction of the rib structure and the plate surface of the terminal board is greater than 0° and less than 180°; or,

The protrusion direction of the rib structure is perpendicular to the board surface of the terminal board.
The junction box according to claim 1, wherein the rib structure comprises two rib segments extending along a first direction, and the two rib segments are arranged on the terminal board at intervals along the second direction. Above, the welding area is located between the two edge segments;

The first direction is the extension direction of each of the edge segments on the terminal board, and the second direction is the distribution direction of the two edge segments on the terminal board;

When the junction box and the lead wire are in an electrical connection state, the first direction is the same as the extension direction of the lead wire on the terminal board.
The junction box according to claim 3, wherein at least one end of each of the edge segments is located in the terminal board or flush with the side of the terminal board.
The junction box according to claim 1, wherein the rib structure is a fully enclosed annular rib, and the welding area is located in an area enclosed by the fully enclosed annular rib.
The junction box according to claim 1, wherein the rib structure is a semi-closed annular rib, and the welding area is located in an area enclosed by the semi-closed annular rib.
The junction box according to claim 6, wherein the semi-closed annular rib has a gap close to the first through hole, and the lead wire passes through the first through hole and is welded to the gap In the welding area.
The junction box according to claim 6, wherein the semi-closed annular rib has at least three edge segments, and there is a gap between the ends of two adjacent edge segments.
The junction box according to claim 1, wherein the box body further has at least one retaining wall located in the box body, the at least one retaining wall is located on the side of the terminal board; each of the retaining walls The wall is higher than the board surface of the terminal board with a rib structure, the rib structure includes at least one rib segment, and the at least one retaining wall and the at least one rib segment enclose the welding area.
The junction box according to claim 9, wherein each of the edge segments is parallel to the wall surface of each of the retaining walls in the extending direction of the terminal board; each of the edge segments is located in the welding On the first side of the area, each of the retaining walls is located on the second side of the welding area; when the junction box and the lead wire are in an electrical connection state, each of the edge segments is in the extending direction of the terminal board It is the same as the extension direction of the lead wire on the terminal board.
The junction box according to any one of claims 1 to 10, wherein the terminal board further has at least one protrusion for limiting the lead wire, and the protrusion direction of the protrusion is away from The direction of the bottom surface of the box body, which is used to contact the photovoltaic module.
The junction box according to any one of claims 1 to 10, wherein the side wall of the first through hole is perpendicular to the bottom surface of the box body and the top surface of the box body; the bottom surface of the box body is perpendicular to the box body. The top surface is opposite, and the bottom surface of the box body is used to contact the photovoltaic module; and/or,

The first through hole is a rectangular through hole.
The junction box according to any one of claims 1 to 10, wherein the side wall of the first through hole comprises:

At least one first limit surface for restraining the longitudinal deviation of the lead wire;

And at least one second limit surface for restraining the deviation of the lead wire in the width direction of the lead wire.
The junction box according to claim 13, wherein each of the first limiting surfaces is perpendicular to the bottom surface of the box body and the top surface of the box body, and the bottom surface of the box body is opposite to the top surface of the box body. The bottom surface of the box body is used to contact the photovoltaic module; and/or,

The at least one first limit surface includes two opposite first limit surfaces; and/or,

Each of the second limiting surfaces is perpendicular to the bottom surface of the box body and the top surface of the box body, the top surface of the box body is opposite to the top surface of the box body, and the bottom surface of the box body is used to contact the photovoltaic module; and/ or,

The at least one second limit surface includes two opposite second limit surfaces; and/or,

The first limit surface and the second limit surface intersect.
A photovoltaic module, characterized by comprising a lead wire and the junction box according to any one of claims 1 to 14; the lead wire passes through the first through hole and is welded to the welding area.
The photovoltaic module according to claim 15, wherein the lead wire has a welding section extending into the welding area, the welding section has at least one second through hole, and the photovoltaic module further comprises a solder , The welding agent is riveted to the welding area through at least one of the second through holes.
The photovoltaic module according to claim 16, wherein when the terminal board included in the junction box has at least one positioning structure located in the welding area, each of the second through holes is sleeved in the corresponding positioning structure. Structurally; the aperture of each of the second through holes is greater than or equal to the maximum radial dimension of the corresponding positioning structure; and/or,

At least one of the second through holes is an open through hole or a closed through hole.
The photovoltaic module according to any one of claims 15 to 17, wherein the lead wire has a welding section extending into the welding area, and the surface of the welding section facing the terminal board contains a curved surface and/or Serrated surface.
A wiring method, characterized in that the junction box according to any one of claims 1 to 14 is applied, and the wiring method comprises:

Provide photovoltaic modules with lead wires;

When the first through hole limits the lead wire, the lead wire extends into the welding area of the terminal board through the first through hole;

When the rib structure defines the flux flow area in the welding area, the lead wire and the welding area are welded with flux.
The wiring method according to claim 19, wherein the lead wire has a welding section extending into the welding area, and the welding section has at least one second through hole; wherein the welding flux is used for welding The lead wire and the welding area include: under the drainage action of at least one of the second through holes, the solder flows to the surface of the soldering section away from the terminal board, so that the solder passes through at least one The second through hole rivets the welding section in the welding area;

and / or,

When the terminal board has at least one positioning structure located in the welding area, and after the lead wire extends into the welding area through the first through hole, the rib structure defines the welding flux flow area in the welding area. In the case of an area, before the lead wire and the welding area are welded with a solder, the connection method further includes: sleeve at least one second through hole of the welding section on the corresponding positioning structure.