CN111628719A

CN111628719A - Junction box, photovoltaic module and wiring method

Info

Publication number: CN111628719A
Application number: CN202010432467.9A
Authority: CN
Inventors: 丁威; 何秉轩; 史兴东; 何志富; 朱琛; 吕俊
Original assignee: Taizhou Lerri Solar Technology Co Ltd
Current assignee: Longi Green Energy Technology Co Ltd
Priority date: 2020-04-17
Filing date: 2020-05-20
Publication date: 2020-09-04
Also published as: WO2021208456A1

Abstract

The invention discloses a junction box, a photovoltaic assembly and a wiring method, and relates to the technical field of photovoltaics, so that the wiring reliability and stability of the junction box are improved, and the power generation capacity and safety of a photovoltaic system are guaranteed. The junction box is applied to a photovoltaic assembly with an outgoing line. The junction box comprises a box body and a terminal board arranged in the box body. The box body is provided with a first through hole used for limiting the outgoing line. The terminal plate is located at one side of the first through hole. The terminal plate has a welding region and a rib structure. The rib structure defines a solder flow area at the solder area. When the junction box and the outgoing line are in an electric connection state, the outgoing line penetrates through the first through hole and is welded in the welding area. The photovoltaic module comprises the junction box. The junction box provided by the invention is used for photovoltaic power generation.

Description

Junction box, photovoltaic module and wiring method

The present invention claims priority from the chinese patent application filed by the national intellectual property office on 17/4/2020, having application number 202010307192.6 entitled "a junction box, photovoltaic module and method of wiring", the entire contents of which are incorporated herein by reference.

Technical Field

The invention relates to the technical field of photovoltaics, in particular to a junction box, a photovoltaic module and a wiring method.

Background

In the photovoltaic module, the battery strings can be connected in series by using the junction box connected in parallel to the battery strings, so that the current generated by the photovoltaic module is conducted to an external line. Meanwhile, the bypass diode is arranged in the junction box, so that the hot spot effect of the photovoltaic module can be avoided, and the purpose of protecting the photovoltaic module is achieved.

At present, a battery string in a photovoltaic module draws current through an outgoing line, and a terminal board of a junction box and the outgoing line are welded together by adopting a welding process so as to conduct the current. However, since there are many unstable factors during the soldering process, the lead wires in the conventional photovoltaic module cannot be soldered to the terminal plates accurately as required, and cold solder tends to occur between the terminal plates and the lead wires. When the cold joint appears between the terminal board and the outgoing line, the photovoltaic module is likely to have the problems of breaking down the bypass diode and even burning the junction box in the working process, thereby having adverse effects on the power generation quantity and the safety of the photovoltaic system.

Disclosure of Invention

The invention aims to provide a junction box, a photovoltaic assembly and a wiring method, which are used for increasing the wiring reliability and stability of the junction box so as to ensure the power generation capacity and safety of a photovoltaic system.

In a first aspect, the present invention provides a junction box. The junction box is applied to a photovoltaic module with an outgoing line. This terminal box includes: the box body and establish the terminal plate in the box body. The box body is provided with a first through hole used for limiting the outgoing line. The terminal plate is located at one side of the first through hole. The terminal plate has a welding region and a rib structure. The rib structure defines a solder flow area at the solder area. When the junction box and the outgoing line are in an electric connection state, the outgoing line penetrates through the first through hole and is welded in the welding area.

Under the condition of adopting above-mentioned technical scheme, in lead-out wire and welding area welding process, first through-hole can control the skew degree of lead-out wire in welding area to guarantee that the lead-out wire can be as required the accurate welding in the welding area that has at the terminal plate. Moreover, in the process of welding the lead wire and the welding area, the welding agent is easy to be heated to flow, and the rib structure can restrict the flowing range of the flowing welding agent (namely defining the flowing range of the welding agent) so that the flowing range of the flowing welding agent does not exceed the welding area. In this case, a thick fluidized solder exists between the welding region and the lead wire due to the constraint of the rib structure, thereby reducing the possibility of the cold joint between the terminal plate and the lead wire. Therefore, the junction box provided by the invention can reduce the possibility of false welding between the terminal board and the outgoing line under the condition that the wiring position of the outgoing line is accurate, so that the wiring stability and reliability of the junction box are improved, and the photovoltaic system is ensured to have higher power generation and safety. In addition, the rib structure of the terminal board can be used as a reinforcing rib to improve the strength of the terminal board, so that the terminal board is not easy to deform, and the stability and the reliability of the junction box are improved from the structural stability.

In a possible realization, the terminal plate may also have a groove located in the welding zone. Solder may be placed in the groove before the lead wires are soldered to the soldering area. In the welding process of the lead-out wire and the welding area, the groove can be used as a groove body for containing the welding agent, the flowing speed of the fluidized welding agent is reduced, most of the fluidized welding agent can be restrained in the groove, and therefore the flowing range of the fluidized welding agent is reduced, and the possibility of the false welding between the terminal plate and the lead-out wire is further reduced.

In a possible realization, the depth of the aforementioned groove is greater than or equal to 0.2 mm. At the moment, in the process of welding the lead-out wire and the welding area, the thickness of the fluidized welding agent can reach 0.2mm or more than 0.2mm at most under the constraint action of the groove structure. In this case, the lead wires can be better welded to the terminal plate to further reduce the possibility of occurrence of cold joint.

In a possible implementation manner, the protruding direction of the rib structure is a direction away from the bottom surface of the box body. The bottom surface of the box body is used for contacting the photovoltaic module. That is, when the junction box is electrically connected with the outgoing line, the rib structure protrudes along the direction away from the back surface of the photovoltaic module. The convex direction of the rib structure forms an included angle with the plate surface of the terminal plate, which is larger than 0 degree and smaller than 180 degrees.

Under the condition of adopting above-mentioned technical scheme, the face of bead structure for the terminal block is upwards to one side, can guarantee that the confined fluidization welding agent of bead structure flows the scope to avoid the fluidization welding agent of restraint in the welding zone to cross other regions that the bead structure flows into the terminal block, consequently, the protruding direction of bead structure can guarantee to have thicker fluidization welding agent between welding zone and the lead-out wire.

In a possible implementation manner, the angle formed by the projection direction of the rib structure and the plate surface of the terminal plate is greater than or equal to 45 degrees and less than or equal to 135 degrees.

Under the condition of adopting the technical scheme, in the welding process of the outgoing line and the welding area, the difference between the area of the fluidized welding agent contacting the welding area and the area contacting the outgoing line is smaller. When the lead wire and the soldering region are soldered, the solder contact area of the lead wire and the solder contact area of the terminal plate tend to be equal, so that the upper surface (i.e., the surface where the solder contacts the lead wire) and the lower surface (i.e., the surface where the solder contacts the terminal plate) of the solder are subjected to relatively close forces. At this time, the difference of the stress of the solder on the upper surface and the lower surface is small, which is helpful for the internal stress distribution of the solder to be uniform, so that when the lead wire is welded on the terminal plate, the solder is not easy to generate the stress concentration problem, so that the lead wire is welded on the terminal plate firmly and stably, and the possibility of the false welding between the terminal plate and the lead wire is further reduced.

In a possible implementation manner, the protruding direction of the rib structure is perpendicular to the plate surface of the terminal plate. At this time, the angle formed by the projection direction of the rib structure and the plate surface of the terminal plate is equal to 90 degrees.

Under the condition of adopting the technical scheme, the area of the contact welding area of the fluidized welding agent is equal to the area of the contact leading-out wire. Theoretically, after the soldering of the lead-out wire and the soldering region is completed, the solder is equally stressed on the upper and lower surfaces, thereby eliminating the problem of stress concentration due to the difference in stress on the upper and lower surfaces to further reduce the possibility of cold solder between the terminal plate and the lead-out wire.

In one possible implementation, the height of the rib structure is greater than or equal to 0.2 mm. At the moment, in the process of welding the leading-out wire and the welding area, the thickness of the fluidized welding agent can reach 0.2mm or more than 0.2mm at most under the constraint action of the rib structure. In this case, the lead wires can be better welded to the terminal plate to further reduce the possibility of occurrence of cold joint.

In one possible implementation, the rib structure includes at least one rib section. Each edge section can be a discontinuous edge section or a continuous edge section. The extending direction of each edge section can be a straight line direction, and also can be one or a combination of a plurality of extending directions of a curve direction and a broken line direction.

In a possible implementation manner, when the at least one rib section includes two rib sections, and the two rib sections extend along the first direction, the rib structure may be considered to include two rib sections extending along the first direction. Two arris sections are established on the terminal block along the second direction interval, and the welding area is located between two arris sections. The first direction may be an extending direction of each of the edge sections in the terminal plate, and the second direction may be a distribution direction of the two edge sections in the terminal plate. When the terminal block is in an electrically connected state with the lead wires, the first direction may be the same as the extending direction of the lead wires in the terminal block.

Adopt under the condition of above-mentioned technical scheme, be located between two arriss sections when the welding area, if the lead-out wire passes first through-hole and stretches into the welding area of welding between two arriss sections along first direction. The two ribs may restrict a flow range of the fluidized solder in the second direction during the welding of the lead-out wire to the welding region, so that the fluidized solder tends to flow in the extending direction of the terminal plate along the lead-out wire (i.e., the first direction), preventing the fluidized solder from flowing to both sides of the terminal plate along the second direction. At this time, the lead wire and the welding agent have a larger contact area, so that the lead wire is stably and reliably welded on the terminal plate, and the resistance of the welding agent can be reduced, so that the electric energy loss caused by overlarge resistance of the welding agent is reduced.

In a possible realization, each segment has at least one end that can be located inside the terminal plate or flush with the side of the terminal plate.

In one possible implementation, the at least one rib section may form an annular rib. The welding area is positioned in the area surrounded by the annular convex ribs.

In a possible implementation manner, when the rib structure includes one rib section, and the rib section is not only a continuous rib section, but also a fully-closed annular rib section, the rib structure is a fully-closed annular rib. The welding area is located in the area surrounded by the totally-enclosed annular convex edges. When the outgoing line and the welding area are welded, under the constraint action of the fully-closed annular convex edge, the fluidized welding agent cannot diffuse towards all directions of the terminal board by taking the welding area as the center, so that the welding stability and reliability of the outgoing line and the terminal board can be further improved, and the possibility of false welding of the outgoing line and the terminal board is reduced.

In one possible implementation, the annular rib is a semi-closed annular rib. At this time, the welding area is located in an area surrounded by the semi-closed annular rib.

With 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 the openings and the first through hole can be selected according to actual requirements. For example: in the case where the opening is close to the first through hole, the lead-out wire may protrude into the soldering region through the opening. The lead-out wire can also cross the annular convex rib and extend into the welding area under the condition of not being close to the first through hole.

In a possible realization, the semi-closed annular rib has a notch close to the first through hole. The lead-out wire passes through the first through hole and the notch and is welded in the welding area. In this case, the notch can be regarded as the aforementioned opening.

Under the condition of adopting above-mentioned technical scheme, can regard as above-mentioned bead structure to include a arris section. The gap is arranged on the edge section, so that the edge section can be a semi-closed annular edge section. In this case, the semi-closed annular rib may have a semi-closed annular structure such as a C-type or N-type structure. When the outgoing line and the welding area are welded, the semi-closed annular convex edge can ensure that the fluidized welding agent cannot diffuse towards other directions except the tendency of diffusing towards the direction of the notch, so that the thickness of the fluidized welding agent between the terminal board and the outgoing line is further increased, the welding stability and reliability of the outgoing line and the terminal board are improved, and the possibility of false welding between the outgoing line and the terminal board is reduced. In addition, when the outgoing line passes through the first through hole and is welded in the welding area, the outgoing line enables the outgoing line to extend into the welding area through the notch in a bending mode. And because the breach is close to first through-hole for under the condition that the fluidization welding agent is to the diffusion of breach place orientation, the fluidization welding agent has the place diffusion of bending to the lead-out wire, consequently, the place that the lead-out wire takes place to bend can gather the fluidization welding agent than thicker, and thus guarantee that lead-out wire and terminal block firm welding together, be favorable to improving the intensity and the fatigue resistance ability of the position that the lead-out wire takes place to bend, thereby further improve the wiring stability and the reliability of terminal box.

In a possible implementation manner, when the semi-closed annular convex edge comprises at least two edge sections, the extending direction of at least one edge section can be selected, so that the at least two edge sections form the semi-closed annular convex edge. In this case, the semi-closed annular rib has at least two voids which can be considered as the aforementioned openings.

In a possible implementation manner, when the semi-closed annular protruding edge includes two edge sections, the extending direction of the two edge sections can be selected to be adjusted, so that the two edge sections can form the semi-closed protruding edge. When at least one or two of the two edge sections have a certain radian, the two edge sections can be enclosed into a semi-closed annular convex edge. At this time, a gap is formed between the two edge sections.

In a possible implementation, when the semi-closed annular convex edge comprises at least three edge sections, a gap is formed between the ends of two adjacent edge sections.

Adopt under the condition of above-mentioned technical scheme, can be according to the welding area position requirement that terminal plate has, establish in the circumference of welding area that at least three arris sections encircle. It is of course also possible to divide the at least three segments into two groups, each group extending over the terminal plate along the first direction mentioned above. And the welding zone is located between two sets of edge segments. In this case, the semi-closed annular rib formed by at least three segments may be regarded as a development of the above two segments extending in the first direction in the terminal block.

In a possible implementation, the box further has at least one retaining wall located within the box. At least one retaining wall is located on the side of the terminal plate. Each retaining wall is higher than the plate surface of the terminal plate with the rib structure. The rib structure comprises at least one rib section. At this time, at least one retaining wall and at least one edge section enclose the welding area.

Under the exclusive circumstances of above-mentioned technical scheme of adoption, at least one barricade is as a part of box body, encloses into the welding zone that terminal board has with at least one arris section to utilize the barricade to reduce the possibility that the fluidization welding agent flows out the terminal block. And, at least one barricade is located the side of terminal board for under the terminal board inaccurate condition of location in the box body, the barricade can also reduce the skew degree of terminal board in the box body.

In a possible realization, each edge section is parallel to the wall surface of each retaining wall in the extension direction of the terminal plate. Each of the rib sections is located on a first side of the weld area. Each retaining wall is located on a second side of the welding area. At this time, when the terminal block is electrically connected to the lead wires, each of the ridge sections is identical to the lead wires in the extending direction of the terminal block.

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

In one possible implementation, the terminal board further has at least one positioning structure for limiting the outgoing line. The positioning structure can be a projection with a prismatic table, a cylinder and the like. The convex direction of the bulge is the direction far away from the bottom surface of the box body. The bottom surface of the box body is used for contacting the photovoltaic module. When the positioning structure is convex, a second through hole can be formed in the structure of the lead-out wire extending into the welding area. When the welding section stretches into the welding area, the second through hole can be utilized to sleeve the welding section on the protrusion, so that the protrusion can position the welding section. When the outgoing line and the welding area are welded, the possibility of deviation of the welding section can be further reduced under the action of the raised positioning, so that the outgoing line is accurately welded in the welding area as required, and the welding reliability and stability of the outgoing line and the terminal board are further improved. In addition, when the outgoing line stretches into the welding area in a mode of crossing the edge section, the welding section has a tendency of jumping upwards, and the projection can inhibit the tendency of jumping upwards of the welding section to a certain extent, so that the projection not only can ensure that the welding section is accurately welded with the welding area, but also can improve the welding reliability and stability of the welding section and the welding area, and further reduce the possibility of false welding of the outgoing line and the terminal board.

In some possible implementations, from the spatial position relationship between the sidewall of the first through hole and the box body, the sidewall of the first through hole is perpendicular to both the bottom surface of the box body and the top surface of the box body. When the junction box and the outgoing line are in an electric connection state, the junction box is arranged on the back of the photovoltaic assembly, so that the bottom surface of the box body is in contact with the back of the photovoltaic assembly. If the lateral wall of first through-hole all can be all perpendicular with box body bottom surface and box body top surface, then the first through-hole that the box body was seted up this moment is also perpendicular with the photovoltaic module back. And, when the lead-out wire passes through first through-hole and stretches into the welding zone that terminal board has, the lead-out wire receives the lateral wall restraint of first through-hole, can not take place great skew in the extending direction of welding section, consequently, the lead-out wire can be under the limiting displacement of first through-hole, the firm reliable welding on the terminal board as required.

In a possible implementation manner, the first through hole is a rectangular through hole. Because the side wall of the rectangular through hole is vertical to the bottom surface of the box body or the back surface of the photovoltaic module, when the outgoing line penetrates through the rectangular through hole serving as the first through hole, the possibility of deviation in the rectangular through hole is low, and the outgoing line can be accurately welded on a terminal board as required.

In a possible implementation, the sidewall of the first through hole includes, in terms of the sidewall configuration of the first through hole: at least one first spacing face and at least one second spacing face.

Each first limiting surface is used for inhibiting the outgoing line from deviating in the length direction. It will be appreciated that during soldering of the lead-out wire to the soldering zone, the lead-out wire has a soldering section extending in substantially the same direction as the first direction, i.e. the previously mentioned direction of extension of the edge section. Based on this, when the first limiting surface restrains the length direction deviation of the outgoing line, the first through hole can control the welding section within the restraint range of the bead structure, and the welding accuracy of the outgoing line on the terminal board is guaranteed.

Each second stopper surface is used for suppressing the lead-out wire from shifting in the width direction of the lead-out wire. In the process of welding the leading wire and the welding area, the leading wire has low possibility of deviation in the width direction, so the leading wire is not easy to deviate on the terminal board along the width direction of the leading wire, and can be accurately aligned with the welding area of the terminal board, thereby improving the welding stability and reliability of the leading wire and the terminal board.

In one possible implementation manner, each first limiting surface is perpendicular to the bottom surface 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 for contacting the photovoltaic module. Similarly, each second limiting 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 for contacting the photovoltaic module. The effect of the first limiting surface and the effect of the second limiting surface can refer to the related description, and are not described herein again.

In a possible implementation manner, the at least one first position-limiting surface includes two first position-limiting surfaces disposed oppositely. At the moment, the first limiting surface close to the terminal board can prevent the outgoing line from excessively extending into the terminal board, so that the situation that the outgoing line and the welding area are welded together is guaranteed to the maximum degree, and the problem of waste caused by the fact that the outgoing line excessively extends into the terminal board is avoided. Meanwhile, the first limiting surface far away from the terminal board can prevent the outgoing line from excessively deviating towards the direction far away from the terminal board, so that the problem that the extension length of the outgoing line in a welding area is insufficient is avoided, and the welding reliability and stability between the outgoing line and the terminal board are ensured.

In a possible implementation manner, the at least one second limiting surface includes two second limiting surfaces which are oppositely arranged. At this time, the two second limiting surfaces can control the lead wire to shift left and right (along the width direction of the lead wire) on the terminal board, and the lead wire can be welded in a welding area through the fluidized welding agent as required.

In a possible implementation manner, the first limiting surface intersects with the second limiting surface. The intersection can be vertical intersection or intersection with an included angle larger than 0 degree and smaller than 90 degrees, as long as the first limiting surface and the second limiting surface are in a non-parallel state.

In a second aspect, the present invention provides a photovoltaic module. The photovoltaic module comprises a terminal box as described in the first aspect or any possible implementation manner of the first aspect and a lead-out wire. The lead-out wire passes through the first through hole and is welded in the welding area. The advantages of the photovoltaic module according to the second aspect may refer to the advantages of the junction box described in the first aspect or any possible implementation manner of the first aspect.

In one possible implementation, the lead-out wire has a soldering section which projects deep into the soldering region. The welding section has at least one second through hole. The photovoltaic module also includes a solder. The welding agent rivets the welding section to the welding area through the at least one second through hole.

Under the condition of adopting the technical scheme, in the welding process of the lead-out wire and the welding area, the fluidized welding agent can be drained to the surface of the lead-out wire, which is far away from the welding area, through the second through hole, so that the welding agent covers the whole structure or part of structure (such as tin-climbing effect) of the lead-out wire, which extends into the welding area. When the lead-out wire and the welding area are welded, the solidified welding agent can play a role similar to a riveting piece, so that the welding section is riveted on the welding area.

In addition, when the solder covers the whole structure or part of the structure of the lead wire extending into the welding area in the welding process of the lead wire and the welding area, the second through hole is used as a flowing channel of the fluidized solder, so that the second through hole is filled with the fluidized solder. In this case, the fluidized solder in the second through hole can restrict the flow range of the fluidized solder below and above the second through hole in the surface direction of the terminal plate, so as to further ensure the welding effect of the lead wire and the welding area, thereby better reducing the possibility of the occurrence of cold joint between the lead wire and the terminal plate.

In a possible implementation, when the terminal block comprises a terminal plate having at least one positioning structure located in the welding zone, each second through hole is sleeved on a corresponding positioning structure. The beneficial effects of the technical scheme can refer to the beneficial effects of the positioning structure in the foregoing, and are not described in detail herein.

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

Under the condition of adopting the technical scheme, when the aperture of one or more second through holes is larger than or equal to the maximum radial dimension of the corresponding positioning structure, and the second through holes are sleeved on the corresponding positioning structure, a gap with a certain width is formed between the side wall of the second through hole and the outer side wall of the positioning structure. The function of the gap can be referred to the related description, and will not be described in detail here.

In one possible implementation, the at least one second through hole is an open through hole or a closed through hole. The open via can be regarded as a notch formed in the edge of the lead line. For the closed through hole, the closed through hole can be regarded as a through hole formed on the outgoing line, and the cross-sectional contour line of the through hole in the radial direction thereof should be a closed contour line.

In one possible embodiment, the lead-out wire has a soldering section which projects into the soldering region. The surface of the welding section facing the terminal plate (called the bottom surface of the welding section for short) comprises a curved surface and/or a sawtooth surface.

Under the condition of adopting the technical scheme, in the welding process of the outgoing line and the welding area, the fluidized welding agent can be fully contacted with the bottom surface of the welding section by virtue of the flowing characteristic of the fluidized welding agent. Compared with the condition that the bottom surface of the welding section is a plane, the bottom surface of the welding section contains a curved surface and/or a sawtooth surface, and the specific surface area of the bottom surface of the welding section is favorably improved. In addition, after the lead wire is welded to the welding area, a plurality of curved or zigzag welding portions may be formed between the bottom surface of the welding stage and the terminal plate. At this time, the curved surface or the zigzag welding portion is matched with the curved surface and/or the zigzag surface of the bottom surface of the welding section, so that the welding effect of the welding section and the welding area can be enhanced, and the possibility of the occurrence of the cold joint can be further reduced.

In a third aspect, the present invention further provides a wiring method, which applies the terminal box described in the first aspect or any possible implementation manner of the first aspect. The wiring method comprises the following steps: providing a photovoltaic module with an outlet; under the condition that the first through hole limits the outgoing line, the outgoing line extends into a welding area of the terminal plate through the first through hole; and in the case that the rib structure defines the solder flowing area in the welding area, welding the leading-out wire and the welding area by using the solder.

In one possible embodiment, the lead-out wire has a soldering section which projects into the soldering region and has at least one second through-hole. At this time, the welding of the lead-out wire and the welding region with the solder includes: under the drainage action of the at least one second through hole, the welding agent flows to the surface of the welding section, which is away from the terminal plate, so that the welding agent rivets the welding section on the welding area through the at least one second through hole.

In one possible implementation, when the terminal block has at least one positioning structure located at the welding region, the lead wire extending into the welding region through the first through hole, and in a case where the bead structure defines a solder flow region at the welding region, the terminal block is welded to the lead wire and the welding region using the solder, the method further includes: and sleeving 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 beneficial effects of the photovoltaic module described in the second aspect or any possible implementation manner of the second aspect.

In a fourth aspect, the present invention provides a photovoltaic system. The photovoltaic system comprises 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 beneficial effects of the photovoltaic system described in the second aspect or any possible implementation manner of the second aspect.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic diagram of a photovoltaic system according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a photovoltaic module according to an embodiment of the present invention;

FIG. 3 is a simplified side view schematic of a photovoltaic module according to an embodiment of the present invention;

FIG. 4 is a simplified top view schematic diagram of a junction box provided in accordance with an embodiment of the present invention;

FIG. 5 is a schematic diagram of a possible structure of a junction box according to an embodiment of the invention;

FIG. 6 is a schematic front view of a terminal block with a notch formed in the terminal block according to an embodiment of the present invention;

FIG. 7 is a schematic top view of a terminal block with a notch formed in the terminal block according to an embodiment of the present invention;

FIG. 8 is a schematic view of a possible position of the rib structure and the terminal plate according to the embodiment of the present invention;

FIG. 9 is a schematic view showing another possible positional relationship between the rib structure and the terminal block in the embodiment of the present invention;

fig. 10 is a schematic top view of a junction box according to an embodiment of the invention;

FIG. 11 is a schematic side view of a possible rib structure and a case according to an embodiment of the invention;

FIG. 12 is a schematic top view of a possible rib structure and case of an embodiment of the present invention;

FIG. 13 is a schematic top view of another possible rib structure and case of the present invention;

fig. 14 is a schematic top view of another possible junction box provided in the embodiment of the present invention;

fig. 15 is a schematic top view of another possible junction box provided in the embodiment of the present invention;

fig. 16 is a schematic top view of another possible junction box provided in the embodiment of the present invention;

fig. 17 is a schematic view of a first possible distribution of two edge segments in a terminal block according to an embodiment of the invention;

fig. 18 is a first schematic view of a second possible distribution of two edge segments in a terminal block according to an embodiment of the invention;

fig. 19 is a second possible distribution of two edge segments in the terminal block according to the embodiment of the invention;

fig. 20 is a third schematic view of a second possible distribution of two edge segments in a terminal block according to an embodiment of the invention;

FIG. 21 is a schematic view showing the expansion of the two rib sections in the terminal block in the first direction according to the embodiment of the present invention;

FIG. 22 is a first schematic top view of a terminal plate and a welding section having a second through hole in a welded state according to an embodiment of the present invention;

FIG. 23 is a second schematic top view of a terminal plate and a welding section having a second through hole in a welded state according to an embodiment of the present invention;

FIG. 24 is a schematic front view of a terminal block provided in accordance with an embodiment of the present invention in a wiring state;

FIG. 25 is a schematic side view of a terminal block according to an embodiment of the invention in a wiring state;

FIG. 26 is a first schematic diagram illustrating the connection between a terminal block and a lead-out wire having a wavy surface according to an embodiment of the present invention;

fig. 27 is a second schematic wiring diagram of the junction box and the outgoing line with a wavy surface according to the embodiment of the present invention;

fig. 28 is a flowchart of a wiring method according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be 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 be indirectly connected to the other element.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Embodiments of the present invention provide a Photovoltaic system, which may perform a Photovoltaic power generation function alone, and may also be applied to Building Integrated Photovoltaic (abbreviated as BIPV), so that the Photovoltaic system may not only perform the Photovoltaic power generation function, but also be used as a part of a Building. When the photovoltaic system performs the power generation function alone, the photovoltaic system may be located in an open outdoor place. When applied to BIPV, photovoltaic systems can be integrated on buildings in the form of flat roofs, pitched roofs, curtain walls, ceilings, etc.

In terms of the use mode of the electric energy transmitted by the photovoltaic system, the electric energy generated by the photovoltaic system can be used on the spot, and can also be accessed into a public power grid through a grid-connected inverter to be uniformly allocated to supply power to users. It will be appreciated that for photovoltaic systems applied to BIPV, a distributed grid tie strategy may be employed to incorporate the utility grid.

In practical applications, the public power grid includes, but is not limited to, a photovoltaic system. For example: the public power grid can also comprise at least one of different types of power generation systems such as a wind power generation system, a thermal power generation system, an ocean power generation system and the like.

The public power grid can 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 may be understood as a grid coverage area divided by regions such as administrative areas, countries, or continental blocks, or may be understood as a grid coverage area within a national organization jurisdiction (e.g., european union, non-union, etc.) formed between countries.

Taking china as an example, the public power grid may be a national power grid, a south power grid, a marine power grid, or the like. Of course, some grid coverage areas listed above for the utility grid may not have emerged, but do not exclude the possibility of emergence in future developments.

Fig. 1 illustrates a schematic diagram of a photovoltaic system according to an embodiment of the present invention. 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 illustrates only a 4 x 3 pv array module of 12 pv modules 110, but in practice there may be fewer or more pv cells 100.

Fig. 2 illustrates a schematic perspective view of a photovoltaic module according to an embodiment of the present invention. As shown in fig. 2, the photovoltaic assembly 200 may include a plurality of cell strings 210 electrically connected together. It should be understood that fig. 2 illustrates only a photovoltaic module 200 of 12 cell strings 210, but in practical applications there may also be photovoltaic modules 200 of fewer or more cell strings 210.

Fig. 3 illustrates a simplified side view schematic diagram of a photovoltaic module provided by an embodiment of the present invention. As shown in fig. 3, the plurality of cell strings 210 shown in fig. 2 may be electrically connected into a photovoltaic cell and encapsulated by the cover sheet and the back sheet. In order to connect different strings of battery modules, the photovoltaic module further includes one or more junction boxes 220, and it should be understood that fig. 3 illustrates only one junction box 220 in relation to the photovoltaic module 200. In practical applications, the number of the junction boxes 220 can be designed by combining the wiring mode of the photovoltaic module structure and the circuit schematic diagram distribution junction box. Currently, a terminal box design can be connected in parallel according to a battery string.

As shown in fig. 3, the junction box 220 can be disposed on the back side 200B of the photovoltaic module (i.e., the surface of the backsheet away from the photovoltaic cells) by bonding or the like. The terminal block 220 may be an integrated terminal block or a split terminal block. Here, when the terminal block 220 is a split terminal block, the terminal block shown in fig. 3 is only one of the split terminal blocks. In practice, other terminal blocks may be included in addition to the one terminal block 220 illustrated in fig. 3. 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 may electrically connect the positive and negative junction boxes.

As shown in fig. 3, when the junction box 220 is applied to the photovoltaic module 200, the photovoltaic module 200 has the lead-out line L electrically connected to the battery string and is welded to the junction box 220. The lead line L for electrically connecting the battery string may have a positive or negative polarity, but may be connected to the terminal box 220 regardless of the positive or negative polarity.

In practical applications, the lead lines L may be solder strips such as bus bars. The solder strips may be connected directly to the battery strings. In this case, the solder ribbon as the lead line L is led out from the photovoltaic module and soldered to the junction box. It should be understood that, when the technical solutions provided by the embodiments of the present invention are exemplarily described below, the lead line L concerned may be a solder strip such as a bus bar or an electrical structure meeting the requirements of the lead line L without specific description.

It should be understood that a person skilled in the art can modify the junction box in the related art based on the core idea of the terminal board provided by the embodiment of the present invention and in combination with the junction box described below, so as to obtain the junction box of the embodiment of the present invention.

As shown in fig. 3, a terminal box 220 provided in an embodiment of the present invention includes: a case 221 and a terminal plate 222 provided in the case 221. Of course, in the case where the terminal block 220 may further include a bypass diode, the terminal block 222 may be electrically connected to the bypass diode. The terminal block 220 illustrated in fig. 3 includes only one terminal block 222 therein, but may include, but is not limited to, two terminal blocks 222. When the number of the terminal plates 222 is plural, each terminal plate 222 should be independent.

As shown in fig. 3, the case body 221 has a first through hole 2210 for limiting the lead-out line L. The terminal plate 222 is located on the side of the first through hole 2210. The position of the first through hole 2210 in the case body 221 can be selected according to practical circumstances. In view of the fact that junction box 220 is mounted on photovoltaic module back side 200B, junction box 220 includes a box bottom surface 221bot that contacts photovoltaic module back side 200B. The top surface of the case is opposite to the bottom surface 221bot of the case. The top surface of the case should be parallel to the bottom surface 221bot of the case. Based on this, in the case where the lead-out wires L are led to the photovoltaic module back surface 200B, the first through holes 2210 may be opened at the bottom of the case body 221 so that the lead-out wires L project from the case body bottom surface 221bot into the case body 221 through the first through holes 2210.

As shown in fig. 3, the terminal plate 222 may be located at one side of the first through hole 2210 so that the structure in which the lead-out wire L protrudes into the case body 221 may be directly welded with the terminal plate 222, thereby shortening the length of the lead-out wire L and avoiding unnecessary power loss. It is understood that the shape and material of the terminal plate 222 may be adjusted as is conventional in the art, so that the terminal plate 222 is adapted to cases of various shapes as long as it is ensured that it can conduct current. For example, the terminal plate 222 may be a metal plate made of metal, and a surface of the metal plate facing the top surface of the case may be a flat surface to provide a welding plane for the lead lines L.

Fig. 4 illustrates a simplified top view schematic diagram of a junction box provided by an embodiment of the present invention. As shown in fig. 4, the terminal plate 222 has a welding region 222Ar and a rib structure 223. It should be understood that the fin structure illustrated in fig. 4 is merely an example, and that there may be more fin structures 223.

As shown in fig. 4, the rib structure 223 defines a solder flow area at the soldering area 222 Ar. When the terminal block 220 is in an electrically connected state with the lead-out wire L, the lead-out wire L is soldered to the soldering area 222Ar through the first through hole 2210. It is to be understood that, when the lead-out wire L is soldered to the soldering region 222Ar, the lead-out wire L may be bent in such a manner that the lead-out wire L may protrude into the soldering region 222Ar after passing through the first through hole 2210 into the case body 221. The lead line L and the bonding region 222Ar may be bonded together using various conventional bonding agents. The solder may be solder in various related arts, including but not limited to solder paste, solder pack, and the like, or non-solder.

As shown in fig. 3 and 4, the first through hole 2210 may control the degree of displacement of the lead wire L in the welding region 222Ar during the welding of the lead wire L with the welding region 222Ar, to ensure that the lead wire L can be accurately welded as desired in the welding region 222Ar which the terminal plate 222 has. Moreover, during the welding process between the lead line L and the welding region 222Ar, the solder is easily heated to flow (the solder may be in a flowing state due to being heated to be softened, or may be in a flowing state due to being heated to be melted), and the rib structure 223 may restrict the flowing range of the fluidized solder (i.e. define the solder flowing region), so that the flowing range of the fluidized solder does not exceed the welding region 222 Ar. At this time, a thick fluidized solder exists between the welding region 222Ar and the lead line L by the restraining action of the rib structure 223, thereby reducing the possibility of the cold joint between the terminal plate 222 and the lead line L. Therefore, the junction box 220 provided by the embodiment of the invention can reduce the possibility of the false welding between the terminal board 222 and the outgoing line L under the condition that the wiring position of the outgoing line L is accurate, so that the wiring stability and reliability of the junction box 220 are improved, and the photovoltaic system is ensured to have higher power generation and safety.

As shown in fig. 4, the rib structure 223 of the terminal plate 222 can also serve as a rib to improve the strength of the terminal plate 222, so that the terminal plate 222 is not easily deformed, thereby improving the stability and reliability of the terminal box 220 in terms of structural stability.

Fig. 5 illustrates a possible structure diagram of the junction box provided by the embodiment of the invention. As shown in fig. 5, in the terminal block 220, the box body may include a receiving case 2211. The housing case 2211 has a housing groove 2212 for housing the terminal plate 222. The receiving groove 2212 can be filled with a pouring sealant to isolate the adverse effect of external water vapor on the terminal board 222. Of course, the case body 221 may further include a cover (not shown in fig. 5) to seal the terminal plate 222 in the receiving groove 2212 using the cover. It should be understood that the receiving shell 2211 and the box cover can be assembled together by clamping, hinging, magnetic attraction, etc. These connection means may be used alone or in combination in a conventional combination.

As shown in fig. 5, the terminal block 222 may be disposed in the terminal block 220 in a snap-fit manner, or may be disposed in the terminal block 220 in a connector connection manner, but is not limited thereto. For example: when the terminal block 222 is disposed in the junction box 220 in a connection manner, the terminal block 222 is provided with one or more mounting holes, and the corresponding box body 221 has one or more mounting portions (e.g., mounting grooves, or brackets having mounting grooves) therein. At this time, a connector such as a rivet or a screw may be inserted and fixed into the mounting portion so that the terminal block 222 is provided in the terminal block 220.

As shown in fig. 5, the number of the terminal plates 222 is two. An insulating wall 224 may be added between the two terminal blocks 222, and the insulating wall 224 can be used to reduce the possibility of interference between the two terminal blocks 222 during current conduction. The case 221 may have various structures as long as it can accommodate the terminal block 222. It should be understood that fig. 1 only illustrates a part of the structure of the box 221, and in practical applications, there are various possible implementations.

In addition, as shown in fig. 5, the terminal box 220 may further include a line pressing plate 225. One of the terminal plates 222 may have a terminal bayonet 223 a. The strain gage 225 may snap the terminal of the cable into the receptacle 2211 and with the terminal bayonet 223 a.

Fig. 6 illustrates a schematic front view of a terminal block provided in an embodiment of the present invention in a case where a terminal block is recessed. Fig. 7 illustrates a schematic top view of a terminal block provided by an embodiment of the present invention in a condition that a terminal block is provided with a groove. As shown in fig. 6 and 7, the terminal plate 222 may further have a groove 222b located at the welding region 222 Ar. The groove 222b can be used as a groove for receiving solder. The contour of the groove 222b may be regular patterns such as regular rectangles and circles, or irregular closed shapes. In addition, when the junction box 220 is disposed on the photovoltaic module back side 200B, the groove 222B can be a groove 222B facing the photovoltaic module back side 200B.

As shown in fig. 6 and 7, before the lead lines L are soldered to the soldering region 222Ar, a solder may be placed in the grooves 222 b. In the process of welding the lead-out wire L to the welding region 222Ar, the groove 222b may serve as a groove body for accommodating the solder, and the flow speed of the fluidized solder is slowed down, so that most of the fluidized solder may be confined in the groove 222b, thereby suppressing the flow range of the fluidized solder to further reduce the possibility of the occurrence of cold joint between the terminal plate 222 and the lead-out wire L. For example: when the solder is a tin pack, the groove 222b serves as a tin-containing groove. Before the lead-out wire L is soldered to the soldering region 222Ar, the tin package is placed in the tin containing tank, and during the soldering process between the lead-out wire L and the soldering region 222Ar, the tin package is heated to be softened and fluidized, so that molten tin is formed, and tends to diffuse around the soldering region 222 Ar. In this case, the flow range of the molten tin can be restricted by the tin containing bath.

As shown in fig. 6 and 7, the depth of the groove 222b is greater than or equal to 0.2 mm. At this time, in the process of welding the lead line L and the welding region 222Ar, the thickness of the fluidized solder can be up to 0.2mm or more than 0.2mm at the maximum under the constraint of the structure of the groove 222 b. In this case, the lead wires L can be better welded to the terminal plate 222 to further reduce the possibility of the occurrence of cold joint. For example: the depth of the groove 222b may be equal to 0.2mm, 0.3mm, 0.5mm, or the like.

In one example, as shown in fig. 6 and 7, a groove 222b may be formed in the welding region 222Ar in addition to the rib structure 223, and the groove region of the groove 222b may be regarded as the aforementioned welding region 222 Ar. The region of the terminal plate 222 not provided with the groove 222b is raised toward the top surface of the case body or raised in a direction away from the bottom surface 221bot of the case body with respect to the in-groove region of the groove 222 b. At this time, the region of the terminal plate 222 not provided with the groove 222b may be regarded as the rib structure 223. Forming the groove 222b in the terminal plate 222 corresponds to forming the rib structure 223 in the terminal plate 222.

In one example, as shown in fig. 6 and 7, the groove 222b may be formed in the terminal plate 222 using a one-step molding process. Of course, the rib structure 223 of the terminal plate 222 may be formed at the same time in the one-step molding process. The one-step forming process can be a pressing process or a demolding forming process.

As a possible implementation manner, fig. 8 illustrates a schematic diagram of one possible positional relationship between the rib structure and the terminal board in the embodiment of the present invention, and fig. 9 illustrates a schematic diagram of another possible positional relationship between the rib structure and the terminal board in the embodiment of the present invention. As shown in fig. 8 and 9, the protrusion direction U of the rib structure is a direction away from the bottom 221bot of the case body. The bottom surface 221bot of the case is used to contact the photovoltaic module 200. I.e. the bottom side 221bot of the box body is intended to contact the photovoltaic panel 210 comprised by the photovoltaic module. In other words, the rib structures 223 are protruded in a direction close to the top surface of the case body. Of course, when the junction box 220 is electrically connected to the lead-out wires L, the rib structure 223 protrudes away from the photovoltaic module back surface 200B.

In an alternative, as shown in fig. 8 and 9, the height h of the rib structure 223 refers to a 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, the thickness of the fluidized solder can be increased to 0.2mm or more than 0.2mm by restricting the flow range of the fluidized solder in the rib structure 223 during the welding process of the lead-out line L and the welding region 222 Ar. In this case, the thickness of the solder can ensure a good soldering effect between the lead-out wire L and the terminal plate 222, thereby further reducing the possibility of occurrence of cold joint.

In addition, as shown in fig. 8 and 9, if the thickness of the fluidized solder exceeds the height h of the rib structure 223, the fluidized solder flows into the non-welding region 222Ar of the rib structure 223 over the rib structure 223, and thus, the height h of the rib structure 223 may determine the thickness of the solder between the lead line L and the terminal plate 222 and the welding reliability and stability of both.

In an alternative form, as shown in fig. 8, the protruding direction U of the rib structure forms an angle α of more than 0 ° and less than 180 ° with the plate surface of the terminal plate 222. At this time, the rib structure 223 is inclined upward with respect to the plate surface of the terminal plate 222 such that the length of the rib structure 223 in the projection 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 inclined upward with respect to the plate surface of the terminal plate 222, the rib structure 223 may restrict the flow range of the fluidized solder to avoid restricting the fluidized solder in the welding region 222Ar from flowing over the rib structure 223 into other regions of the terminal plate 222, and thus, the projection direction of the rib structure 223 may ensure a thicker fluidized solder between the welding region 222Ar and the lead-out line L.

Illustratively, as shown in fig. 8, the protrusion direction of the rib structure 223 forms an angle α of 45 ° or more and 135 ° or less with the plate surface of the terminal plate 222. For example: 60 °, 75 °, 115 °, 135 °, or the like.

As shown in fig. 8, in the process of soldering the lead line L and the soldering region 222Ar, the difference between the area of the fluidized solder contacting the soldering region 222Ar and the area contacting the lead line L is relatively small. Based on this, when the lead wire L and the soldering region 222Ar are completed and the fluidized solder has solidified, the solder contact area of the lead wire L and the solder contact area of the terminal plate 222 tend to be equal, so that the upper surface (i.e., the surface where the solder contacts the lead wire L) and the lower surface (i.e., the surface where the solder contacts the terminal plate 222) of the solder are subjected to relatively close forces. At this time, the difference in stress between the upper and lower surfaces of the solder is small, which contributes to uniformizing the distribution of internal stress of the solder, and therefore, when the lead wire L is soldered to the terminal plate 222, the solder is less likely to cause a stress concentration problem, so that the lead wire L is soldered to the terminal plate 222 more firmly and stably, thereby further reducing the possibility of cold solder between the terminal plate 222 and the lead wire L.

As shown in fig. 9, in order to further reduce the possibility of cold welding between the terminal plate 222 and the lead line L, the projection direction of the rib structure 223 is perpendicular to the plate surface of the terminal plate 222. At this time, the height of the rib structure 223 is h as shown in fig. 9. And the length of the rib structure 223 in the projection direction is equal to the height of the rib structure 223.

As shown in fig. 9, the protrusion direction of the rib structure 223 forms an angle equal to 90 ° with the plate surface of the terminal plate 222. In this case, the area of the fluidized solder contacting the soldering region 222Ar is equal to the area of the contact lead line L. Theoretically, when the soldering of the lead wires L to the soldering region 222Ar is completed, the solder is equally stressed on the upper and lower surfaces, thereby eliminating the problem of stress concentration due to the difference in stress on the upper and lower surfaces to further reduce the possibility of the occurrence of cold joint between the terminal plate 222 and the lead wires L.

As one possible implementation, as shown in fig. 10-27, fig. 3 illustrates that the rib structure 223 may include at least one rib segment D. Each edge section D can be an interrupted edge section or a continuous edge section. The extending direction of each edge section can be a straight line direction, and also can be one or a combination of a plurality of extending directions of a curve direction and a broken line direction. It should be understood that when the extending direction of each edge segment is a curved extending direction, the edge segment may be a curved extending direction, or a wavy extending direction, but is not limited thereto. The rib D may be formed by pressing the terminal plate 222 using a pressing process (e.g., a press flanging process), or may be formed separately from the terminal plate 222.

In an alternative, the rib structure 223 illustrated in FIG. 3 may be an annular rib. The welding region 222Ar is located in a region surrounded by the annular rib. At this time, at least one rib section D included in the rib structure 223 may form an annular rib.

In an alternative, fig. 10 illustrates a schematic top view of a terminal block provided by an embodiment of the present invention. As shown in fig. 10, the rib structure shown in fig. 3 is a fully closed annular rib. The welding region 222Ar is located in a region surrounded by the fully-closed annular rib. At this time, the rib structure 223 may be considered to include one rib D. The strip edge section D is not only a continuous edge section, but also a totally-enclosed annular edge section. It should be understood that the rib segment D may be a broad annular segment. That is, the ring shape of the ring-shaped ridge section may include a ring shape such as a circular ring or an elliptical ring, or may include a polygonal ring shape such as a triangular ring, a rectangular ring, or a pentagonal ring, but is not limited thereto.

As shown in fig. 10, during the welding of the lead line L and the welding region 222Ar, the fluidized solder does not spread in all directions of the terminal plate 222 around the welding region 222Ar under the constraint of the fully closed annular rib, and the welding stability and reliability of the lead line L and the terminal plate 222 can be further improved, thereby reducing the possibility of cold welding between the lead line L and the terminal plate.

In an alternative, to prevent the fluidized solder from flowing out of the terminal plate. Fig. 11 illustrates a side view of a possible rib structure and cartridge in an embodiment of the invention. Fig. 12 illustrates a schematic top view of a possible rib structure and case in an embodiment of the present invention. As shown in fig. 11 and 12, the case 221 further has at least one retaining wall 221Q formed in the case 221. The retaining wall 221Q should be higher than the plate surface of the terminal plate 222 having the rib structure 223. At least one retaining wall 221Q is located at the side of the terminal plate 222.

As shown in fig. 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 wall 221Q are used to define a solder flow area at the soldering area 222 Ar. Based on this, when the fluidized solder flows from the opening to the outside of the terminal plate, 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 define the solder flow region at the soldering region 222 Ar.

As shown in fig. 11 and 12, the retaining wall 221Q may be a structure originally provided in the box 221, or may be a retaining wall provided in an already-manufactured box 221. For example: when the retaining wall 221Q is the original structure of the box 221, the retaining wall 221Q and the box 221 may be made of the same plastic material. At this time, the at least one retaining wall and the box body may be of an integral structure. Of course, there may be a case where the material of the retaining wall 221Q is different from that of the box 221. Another example is: when the retaining wall 221Q is a retaining wall provided in the already-fabricated cartridge 221, various fixing members may be used to fix the retaining wall 221Q in the cartridge 221, or an adhesive may be used to bond the retaining wall 221Q in the cartridge 221.

It can be understood that, as shown in fig. 11 and 12, each opening K is opposite to the corresponding retaining wall 221Q, where one opening K may be opposite to one retaining wall 221Q, or may be opposite to a plurality of retaining walls 221Q, depending on the actual situation. The side surface of the terminal plate 222 may contact the wall surface of at least one wall 221Q, or may have a gap with the wall surface of the wall 221Q.

As shown in fig. 11 and 12, when the terminal board 222 is disposed in the box 221 by connecting, the position of the mounting hole formed in the terminal board 222 can be adjusted so that the terminal board 222 is mounted in the box 221 through the mounting hole, and at least one retaining wall 221Q is located at the side of the terminal board 222, so that the retaining wall 221Q can also reduce the degree of displacement of the terminal board 222 in the box 221 in case that the terminal board 222 is not accurately positioned in the box 221.

In one example, as shown in fig. 11 and 12, when the case 221 has at least one retaining wall 221Q in the case 221 and the at least one retaining wall 221Q is on the side of the terminal plate 222, if the rib structure 223 includes at least one rib D, the retaining wall 221Q should be higher than the plate surface of the terminal plate 222 having the rib structure 223, and the at least one retaining wall 221Q is a part of the case 221, so that the at least one retaining wall 221Q and the at least one rib D surround the welding area 222 Ar. In this regard, the opening K of the rib structure may be provided by at least one rib section D. At this time, the rib structure 223 is substantially a semi-closed ring-shaped rib structure.

For example, the following steps are carried out: as shown in fig. 12, the rib structure 223 includes only one rib section D. This arris section is C type arris section for an opening K can be formed to two tip of this arris section D. When the box 221 has two retaining walls 221Q located in the box 221, the opening K faces the direction of the two retaining walls 221Q.

In another example, fig. 13 illustrates another possible schematic top view of a fin structure and a case in an embodiment of the invention. As shown in fig. 13, when the case 221 has at least one retaining wall 221Q inside the case 221. At least one retaining wall 221Q is located at the side of the terminal plate 222. Each of the edge sections D is parallel to the wall surface of each of the retaining walls 221Q in the extending direction of the terminal plate. Each land D is located on a first side of the welding region 222 Ar. Each retaining wall 221Q is located on the second side of the welding region 222 Ar. At this time, the welding region 222Ar is located between the at least one retaining wall 221Q and the at least one edge section D. At this time, when the junction box 220 and the photovoltaic module are electrically connected together, the ridge D extends in the same direction as the lead line L extends in the terminal plate 222 in the direction in which the terminal plate 222 extends. At this time, the outgoing line L is located between the edge section D and the retaining wall.

For example, as shown in fig. 13, the rib structure includes a rib section D. The two ends of the edge section D can now form the openings described above, except that the openings can be considered as C-shaped openings. The case 221 has a retaining wall 221Q in the case 221. The ridge D is parallel to the wall surface of the wall 221Q in the extending direction of the terminal plate 222, so that the ridge D is linear in the extending direction of the terminal plate 222. When the junction box 220 and the photovoltaic module 200 are electrically connected, the ridge D extends in the same direction as the lead line L extends in the terminal plate 222. At this time, the lead-out line L is located between the ridge section D and the retaining wall 221Q.

In an alternative, fig. 14 illustrates another possible schematic top view of the junction box provided by the embodiment of the invention. Fig. 15 illustrates yet another possible schematic top view of a junction box provided by an embodiment of the invention. As shown in fig. 14 and 15, the rib structure 223 is a semi-closed annular rib. At this time, the welding region 222Ar is located in a region surrounded by the semi-closed annular rib. It is understood that the distribution of the at least two edge segments on the terminal plate 222 may be arranged according to the position requirements of the welding area 222Ar which the terminal plate 222 has.

As shown in fig. 14 and 15, the semi-closed annular rib may be regarded as one or more openings K (i.e., the openings K of the rib structure) formed in the fully-closed annular rib D. The spatial relationship between these openings K and the first through hole 2210 can be selected according to actual needs.

In one example, as shown in fig. 14, in the case where the opening K is close to the first through hole 2210, the lead-out wire L may protrude into the soldering region 222Ar through the opening K. As shown in fig. 15, in the case where the opening K is not close to the first through hole 2210, the lead line L may extend into the bonding region 222Ar across the annular rib.

In one example, fig. 16 illustrates a simplified top view schematic diagram of a junction box provided by an embodiment of the invention. As shown in fig. 16, the semi-closed annular rib has a gap Q adjacent to the first through hole 2210. The lead wire L is soldered to the soldering region 222Ar through the first through hole 2210 and the notch Q. The gap Q can be regarded as the opening K mentioned above.

When the semi-closed annular rib has the gap Q adjacent to the first through hole 2210, as shown in fig. 16, it can be considered that the rib structure 223 includes only one rib section D. The gap Q is arranged on the rib section D, so that the rib section is a semi-closed annular rib section. In this case, the semi-closed annular rib may have a semi-closed annular structure such as a C-type or N-type structure.

As shown in fig. 16, during the welding process of the lead line L and the welding area 222Ar, the semi-closed annular rib can ensure that the fluidized solder has a tendency of diffusing toward the direction of the gap Q and does not diffuse toward other directions, so as to further increase the thickness of the fluidized solder between the terminal plate 222 and the lead line L, improve the welding stability and reliability of the lead line L and the terminal plate 222, and reduce the possibility of the cold joint between the lead line L and the terminal plate.

In addition, as shown in fig. 16, when the above-described lead wire L is soldered to the soldering region 222Ar through the first through hole 2210, the lead wire L is bent through the first through hole 2210 in such a manner that the lead wire L can protrude into the soldering region 222Ar through the notch Q. Since the notch Q is close to the first through hole 2210, the fluidized solder is spread to the bent portion of the lead-out wire L when the fluidized solder is spread in the direction of the notch Q, and therefore, the bent portion of the lead-out wire L can accumulate the relatively thick fluidized solder, thereby ensuring that the lead-out wire L and the terminal plate 222 are firmly welded together, facilitating the improvement of the strength and fatigue resistance of the bent portion of the lead-out wire L, and further improving the stability and reliability of the connection of the terminal box 220.

It should be noted that, when the semi-closed annular protruding edge includes at least two edge sections, the extending direction of at least one edge section may be selected, so that the at least two edge sections form the semi-closed annular protruding edge. At this time, the structure of the semi-closed annular rib can be referred to the related description of fig. 14 and 15. Also, the semi-closed annular rib has at least two voids that can be considered as openings K as shown in fig. 14 and 15. The distribution of the at least two edge sections on the terminal block can be arranged according to the position requirements of the welding area of the terminal block.

When at least two edge sections of the semi-closed annular convex edge are provided with at least two gaps, the spatial position relationship between the at least two gaps and the first through hole is random. However, the semi-closed annular rib still achieves the effect achieved by the rib structure described above. For example: at least one of all the voids is close to or facing the first through hole. At this time, the gap may have the function and effect of the notch Q as mentioned in fig. 16.

By way of example, fig. 17 illustrates a first possible distribution of two edge segments in a terminal block in an embodiment of the invention. Fig. 18 illustrates a first possible distribution of two edge segments in the terminal block in the embodiment of the present invention, and fig. 19 illustrates a second possible distribution of two edge segments in the terminal block in the embodiment of the present invention. As shown in fig. 17 to 19, when the semi-closed annular protruding rib includes two edge sections D, or the protruding rib structure 223 shown in fig. 3 or at least one edge section included in the protruding rib structure 223 includes two edge sections D, the extending direction of the two edge sections D may be selected so that the two edge sections may form the semi-closed protruding rib.

In one example, as shown in fig. 17, when at least one of the two edge segments D or both of the two edge segments D have a certain curvature, the two edge segments D may be formed as a semi-closed annular convex rib. As shown in fig. 14 and 15, the semi-closed annular rib has two gaps as the aforementioned openings K.

In another example, as shown in fig. 18 and 19, two ribs D extend in the first direction a on the terminal plate 222 such that the two ribs D are parallel. The rib structure 223 formed by the two rib sections D can now be considered as a special case of a semi-closed annular rib. The semi-closed annular rib in this particular case is not a semi-closed annular structure in general. It should be understood that the two ribs D may extend along the first direction a in a straight line form, or may extend along the first direction a in a curved line form such as an arc line, a wavy line, etc. Of course, it may also extend in the first direction in the form of a zigzag line.

As shown in fig. 18 and 19, when two edge sections D are provided on the terminal plate 222 at intervals in the second direction B, the welding area 222Ar may be located between the two edge sections D. The second direction B may be a direction in which two edge segments are distributed in the terminal plate 222. When the terminal block 220 is in an electrically connected state with the lead-out wires L, the first direction may be the same as the extending direction of the lead-out wires L in the terminal plate 222. It should be understood that the two edge segments D are parallel in a broad sense, and the broad parallel is only required to ensure that the overall extending directions of the two edge segments D are the same.

In one case, as shown in fig. 18, both of the two ridge sections D extend in the form of a wavy line extending in the first direction a. The lead line L extends into the welding region 222Ar between the two ribs extending in a wavy line.

In another case, as shown in fig. 19, both the two ridge sections D extend in a straight line toward the first direction a, and the lead line L extends into the welding area 222Ar between the two ridge sections.

As shown in fig. 18 and 19, regardless of the form of the two edge sections extending in the first direction a, the bonding area 222Ar is located between the two edge sections, and the lead-out line L passes through the first through hole 2210 and extends in the first direction a into the bonding area 222Ar bonded between the two edge sections. The two ribs may restrict the flow range of the fluidized solder in the second direction during the welding of the lead lines L to the welding region 222Ar, so that the fluidized solder tends to flow in the extending direction of the terminal plate 222 along the lead lines L (i.e., the first direction a), preventing 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 large contact area with the solder, so that the lead wire L is firmly and reliably soldered to the terminal plate 222. On the basis, the lead-out wire L has a larger contact area with the welding agent, and the resistance of the welding agent can be reduced, so that the electric energy loss caused by overlarge resistance of the welding agent is reduced.

It will be appreciated that each of the edge segments D has two ends. The edge segment D may have at least one end that is located within the terminal plate 222 or flush with the side of the terminal plate 222.

Fig. 20 illustrates a third possible distribution of two edge segments in a terminal block according to an embodiment of the invention. As shown in fig. 20, the terminal plate 222 has a left side 222L and a right side 222R distributed along the first direction. The left side 222L is adjacent to the first through hole 2210. Each of the prism segments D has a first end D1 and a second end D2 distributed along the first direction a. That is, each segment D has a first end D1 near the left side 222L of the terminal plate 222 and a second end D2 near the right side 222R of the terminal plate 222.

As shown in fig. 20, each segment D may have a first end D1 that is flush with the left side 222L or may be located within the terminal plate 222, i.e., the region of the terminal plate 222 between the first side 222L and the second side 222R. Each segment D may have a second end D2 that is flush with the right side 222R or may be located within the terminal plate 222, i.e., the region of the terminal plate 222 between the first side 222L and the second side 222R.

Illustratively, when the semi-closed annular convex edge comprises at least three edge sections, the semi-closed annular convex edge formed by the at least three edge sections has at least three gaps. At the moment, a gap is reserved between the ends of two adjacent edge sections. The void may be an opening K as shown in fig. 15 and 16. Reference may be made to the description above in relation to fig. 15.

In practical application, fig. 21 illustrates a schematic view of the expansion of the two edge segments in the terminal block in the first direction in the embodiment of the present invention. As shown in fig. 21, at least three edge segments may be circumferentially arranged in the welding area 222Ar according to the position requirement of the welding area 222Ar of the terminal plate 222. Of course, it is also possible to divide the at least three segments D into two groups, each group of segments D extending on the terminal plate 222 along the aforementioned first direction. And the weld region 222Ar is located between the two sets of edge segments. In this case, the semi-closed annular rib formed by the at least three segments D may be regarded as a spreading type in which the two segments D extend in the terminal plate 222 along the first direction. In this case, when the two previous edge sections D extend in the first direction at the terminal plate 222, at least one edge section D is a discontinuous edge section. The discontinuous edge section can be regarded as being formed by a plurality of short edge sections. For the same discontinuous edge section, the head part of one short edge section can be considered to be adjacent to the tail part of the other end edge section, and a gap is arranged between the head part and the tail part.

In an alternative, fig. 22 is a first schematic plan view of the terminal plate and the welding section having the second through hole in a welded state according to the embodiment of the present invention; fig. 23 is a second schematic plan view of the terminal plate and the welding section having the second through hole in the welded state according to the embodiment of the present invention. As shown in fig. 22 and 23, the terminal plate 222 further has at least one positioning structure 226 for positioning the lead-out wires L regardless of the structure of the rib structure. The positioning structure 226 may be a protrusion of a truncated pyramid, a cylinder, etc., and it should be understood that when the positioning structure 226 is a protrusion, the protrusion is directed away from the bottom surface 221bot (or toward the top surface of the case). The bottom surface 221bot of the case is used for contacting the photovoltaic module. The following describes the process of positioning the lead-out lines L by the positioning structure 226 by taking the bumps as an example, and the following is only for example and not for limitation.

As shown in fig. 22, when the positioning structure 226 is a bump, at least one second through hole L1 may be opened in a structure (defined as a welding section L0) in which the lead-out line L protrudes into the welding region 222 Ar. At least one of the second through holes L1 is an open through hole or a closed through hole in terms of whether the second through hole L1 is closed or not. The open via can be regarded as a notch formed at the edge of the lead line L. For the closed through hole, the closed through hole can be regarded as a through hole formed on the outgoing line L, and the cross-sectional contour line of the through hole in the radial direction thereof 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 pentagram, an explosion, a star, a C-shape, etc.

As shown in fig. 22, when the welding segment L0 extends into the welding area 222Ar, each second through hole L1 can be used to fit the welding segment L0 over the corresponding protrusion, so that the protrusion can position the welding segment L0. In the process of welding the lead-out wire L and the welding area 222Ar, under the positioning action of the protrusion, the possibility of the welding section L0 being displaced can be further reduced, so that the lead-out wire L is accurately welded to the welding area 222Ar as required, and the reliability and stability of the welding of the lead-out wire L and the terminal plate 222 are further improved.

In addition, as shown in fig. 22, when the lead wires L do not project into the welding region 222Ar through the openings K shown in fig. 14 and 15, but project into the welding region 222Ar so as to straddle the ridge sections D shown in fig. 10 and 15, the welding sections L0 have a tendency to jump upward. Based on this, as shown in fig. 23, the positioning structure 226 such as a bump can suppress the tendency of the welding section L0 to move upward to some extent, so that the positioning structure 226 such as a bump can not only ensure that the welding section L0 is accurately welded with the welding area 222Ar, but also improve the reliability and stability of welding between the welding section L0 and the welding area 222Ar, so as to further reduce the possibility of the faulty 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 terminal box provided in the embodiment of the present invention in a wiring state, and fig. 25 is a schematic side view of the terminal box provided in the embodiment of the present invention in the wiring state. As shown in FIGS. 24 and 25, from the spatial positional relationship of the side wall of the first through hole 2210 with respect to the case body 221, the side wall of the first through hole 2210 can be perpendicular to both the case body bottom surface 221bot and the case body top surface regardless of the rib structure 223. It should be understood that the spatial relationship between the bottom surface 221bot and the top surface of the case and the related description may be referred to previously.

As shown in fig. 24 and 25, when junction box 220 is in an electrically connected state with outlet L, junction box 220 is provided on photovoltaic module back surface 200B such that box body bottom surface 221bot is in contact with photovoltaic module back surface 200B. If the side walls of the first through hole 2210 can be perpendicular to both the bottom surface 221bot and the top surface of the case, the first through hole 2210 formed in the case 221 is also perpendicular to the photovoltaic module back surface 200B. Further, when the lead wire L is inserted into the soldering region 222Ar of the terminal board 222 through the first through hole 2210, the lead wire L is restrained by the side wall of the first through hole 2210, and does not largely deviate in the extending direction of the lead wire L, so that the lead wire L can be soldered to the terminal board 222 stably and reliably as required by the stopper action of the first through hole 2210.

It is understood that the first through hole 2210 is a rectangular through hole as shown in fig. 24 and 25. Since the side walls of the rectangular through-holes are perpendicular with respect to the case bottom surface 221bot or the photovoltaic module back surface 200B, there is a low possibility that the lead-out wires L will be displaced in the rectangular through-holes when passing through the rectangular through-holes as the first through-holes 2210, thereby ensuring that the lead-out wires L can be accurately soldered to the terminal plate 222 as required.

As shown in fig. 24 and 25, the side wall of the first through hole 2210 includes, from the perspective of the side wall of the first through hole 2210, regardless of the rib structure 223: at least one first M1 and at least one second M2 stop surface.

As shown in fig. 24 and 25, each first stopper surface M1 is for suppressing the longitudinal displacement of the lead line L. It is to be understood that the lead wires L shown in fig. 22 and 23 have the welding sections L0 extending in substantially the same direction as the first direction a, i.e., the aforementioned direction in which the ridge sections extend, during the welding of the lead wires L to the welding regions 222 Ar. Based on this, when the first stopper surface M1 restrains the longitudinal displacement of the lead wire L, the first through hole 2210 can control the welding stage L0 shown in fig. 22 and 23 within the previously mentioned restriction of the rib structure 223, ensuring the welding accuracy of the lead wire L at the terminal plate 222.

Illustratively, as shown in fig. 24 and 25, each first stopper surface M1 is perpendicular to the case bottom surface 221bot and the case top surface. The effect of the first limiting surface M1 can be obtained by referring to the related description above, and will not be described herein. It should be understood that the spatial relationship between the bottom surface 221bot and the top surface of the case and the related description may be referred to previously.

As shown in fig. 24 and 25, the number of the first stopper surfaces M1 may be two. That is, the at least one first stopper surface M1 includes two first stopper surfaces M1 disposed oppositely. At this time, the first stopper surface M1 near the terminal board 222 can prevent the lead line L from excessively protruding into the terminal board 222, so as to maximally ensure that the lead line L is welded to the welding area 222Ar, and avoid the problem of waste of the lead line L caused by the lead line L excessively protruding into the terminal board 222. Meanwhile, the first stopper surface M1 away from the terminal plate 222 may prevent the lead line L from excessively shifting toward a direction away from the terminal plate 222, to avoid a problem of insufficient extension length of the lead line L in the welding area 222Ar, thereby ensuring welding reliability and stability between the lead line L and the terminal plate 222.

As shown in fig. 24 and 25, each of the second stopper surfaces M2 is for suppressing the lead-out wires L from shifting in the width direction thereof. In the process of welding the lead wire L to the welding region 222Ar, the lead wire L is less likely to be displaced in the width direction thereof, and therefore, the lead wire L is less likely to be displaced in the terminal plate 222 in the width direction thereof, and can be accurately aligned with the welding region 222Ar of the terminal plate 222, thereby improving the welding stability and reliability of the lead wire L and the terminal plate 222.

Illustratively, as shown in fig. 24 and 25, each of the second stopper surfaces M2 is perpendicular to the case bottom surface 221bot and the case top surface. The effect of the second limiting surface M2 can be obtained by referring to the related description above, and will not be described herein. It should be understood that the spatial relationship between the bottom surface 221bot and the top surface of the case and the related description may be referred to previously.

As shown in fig. 24 and 25, the at least one second stopper surface M2 includes two second stopper surfaces M2 disposed opposite to each other. At this time, the two second stopper surfaces M2 can control the lead line L to shift left and right (in the width direction of the lead line) in the terminal plate 222, and ensure that the lead line L can be soldered to the soldering region 222Ar with the fluidized solder as required.

As shown in fig. 24 and 25, the first stopper surface M1 intersects the second stopper surface M2. When the first stopper surface M1 and the second stopper surface M2 are perpendicularly intersected, the included angle β formed by the first stopper surface M1 and the second stopper surface M2 is 90 °, or is intersected with an included angle smaller than 90 °, so long as the first stopper surface M1 and the second stopper surface M2 are in a non-parallel state.

As shown in fig. 24 and 25, when the first stopper surface M1 perpendicularly intersects the second stopper surface M2, the first through hole 2210 may be a rectangular through hole. When the intersection angle of the first stopper surface M1 and the second stopper surface M2 is greater than 0 ° and smaller than 90 °, the first through hole 2210 may be a diamond-shaped hole.

Based on the junction box structure, as shown in fig. 3 to 25, the photovoltaic module provided by the embodiment of the invention includes a lead-out wire L and a junction box 220. The lead-out wire L is soldered to the soldering region 222Ar through the first through hole 2210. The beneficial effects of the photovoltaic module can be described with reference to the beneficial effects of the junction box 220 shown in fig. 3 to 25, and will not be described in detail herein.

As one possible implementation, as shown in fig. 22 and 23, the above-described lead-out wire L has a welding section L0 protruding into the welding region 222 Ar. The welding section L0 has at least one second through hole L1. The photovoltaic module also includes a solder. The solder rivets the solder segment L0 to the solder area 222Ar through the at least one second through hole L1.

In the case where the positioning structure 226 is not provided in fig. 22 and 23, during the soldering of the lead-out wire L to the soldering region 222Ar, the fluidized solder may be led to the surface of the lead-out wire L away from the soldering region 222Ar through the second through hole L1, so that the solder covers the entire structure or a part of the structure of the lead-out wire L protruding into the soldering region 222Ar (for example, a tin-climbing effect). When the lead-out wires L are soldered to the soldering region 222Ar, the solidified solder may function like a rivet, so that the soldering section L0 is riveted to the soldering region 222 Ar. In addition, when the solder covers the entire structure or a part of the structure in which the lead wire L protrudes into the soldering region 222Ar during the soldering of the lead wire L with the soldering region 222Ar, the second through hole L1 serves as a flow passage for the fluidized solder so that the second through hole L1 is filled with the 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 plate surface direction of the terminal plate 222 to further secure the soldering effect of the lead line L and the soldering region 222Ar, thereby better reducing the possibility of the occurrence of the cold joint between the lead line L and the terminal plate 222.

In an alternative manner, as shown in fig. 22 and 23, when the terminal board 222 included in the terminal box 220 has at least one positioning structure 226 located in the welding area 222Ar, each second through hole L1 is sleeved on the corresponding positioning structure 226, and the specific effect can refer to the related description above, which is not repeated herein.

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

As shown in fig. 22 and 23, when the diameter of the second through hole L1 is larger than the diameter of the cylindrical protrusion, i.e., the second through hole L1, the second through hole L1 is sleeved on the corresponding positioning structure 226, and a gap with a certain width is formed between the side wall of the second through hole L1 and the outer side wall of the positioning structure 226. The function of the gap can be referred to the related description, and will not be described in detail here.

In an alternative, as shown in fig. 22 and 23, the at least one second through hole L1 is an open through hole or a closed through hole. The open via can be regarded as a notch Q formed at the edge of the lead line L. For the closed through hole, the closed through hole can be regarded as a through hole formed on the outgoing line L, and the cross-sectional contour line of the through hole in the radial direction thereof should be a closed contour line.

In an alternative, fig. 26 illustrates a first wiring diagram of the terminal block and the lead-out wire with a wavy surface according to the embodiment of the present invention; fig. 27 is a second schematic wiring diagram illustrating the junction box and the lead-out wire with a wavy surface according to the embodiment of the present invention. As shown in fig. 26 and 27, the lead-out wire L has a bonding segment L0 protruding into the bonding region 222 Ar. The surface of the welded segment L0 facing the terminal plate 222 (hereinafter referred to as the welded segment bottom surface) includes a curved surface and/or a serrated surface. Of course, the surface of the welding section L0 facing away from the terminal plate 222 (referred to as the welding section top surface) may be a flat surface, a curved surface and/or a serrated surface. It is understood that curved surfaces include arcs, waves, and the like. The surface of the lead-out line L in other areas except for the bonding section L0 is not limited.

As shown in fig. 26 and 27, in the process of soldering the lead-out wire L to the soldering region 222Ar, the fluidized solder can be brought into sufficient contact with the bottom surface of the soldering section by virtue of the flow characteristics of the fluidized solder. Compared with the condition that the bottom surface of the welding section is a plane, the bottom surface of the welding section contains a curved surface and/or a sawtooth surface, and the specific surface area of the bottom surface of the welding section is favorably improved. After the lead line L and the welding area 222Ar are welded, a plurality of curved or zigzag welding portions SW may be formed between the bottom surface of the welding stage and the terminal plate 222. At this time, the curved surface or the zigzag welding portion SW is matched with the curved surface and/or the zigzag surface of the bottom surface of the welding segment L0, and the welding effect of the welding segment L0 and the welding area 222Ar is strengthened, so that the possibility of the occurrence of the cold joint is further reduced.

Illustratively, as shown in fig. 26, the bottom surface of the welded segment L0 has a wavy surface extending along the first direction a. A solidified wavy weld SW is provided between the wavy surface and the terminal plate. The wavy welding portion SW has a wavy surface extending in the first direction a. At this time, the wavy surface of the wavy welding part SW can be matched with the wavy surface of the bottom surface of the welding section, so that the flow of fluidized welding agent in the first direction in the welding process is limited, and the purpose of strengthening the welding effect is achieved.

Illustratively, as shown in fig. 27, the bottom surface of the welding segment has a wavy surface extending in the second direction B. A solidified wavy weld SW is provided between the wavy surface and the terminal plate. The wavy welding portion SW has a wavy surface extending in the second direction B. At this time, the wavy surface of the wavy welding part SW can be matched with the wavy surface of the bottom surface of the welding section, so that the flowing of fluidized welding agent in the second direction in the welding process is limited, and the purpose of strengthening the welding effect is achieved.

It should be noted that, as shown in fig. 26 and 27, when the bottom surface of the soldering segment L0 includes a curved surface and/or a sawtooth surface, the soldering segment may also be provided with a second through hole L1 with reference to fig. 22 and 23, so as to form a tin melting effect, thereby improving soldering stability and reliability.

The embodiment of the invention also provides a wiring method. The wiring method may be applied to the terminal block 220 shown in fig. 3 to 27. Fig. 28 is a flowchart illustrating a wiring method according to an embodiment of the present invention. As shown in fig. 28, the wiring method provided in the embodiment of the present invention includes:

step 100, providing a photovoltaic module with a leading-out wire L. It should be understood that the photovoltaic module has lead lines L electrically connected to the strings of cells within the photovoltaic module for conducting current to the junction box 220.

Step 200: when the first through hole 2210 limits the lead-out wire L, the lead-out wire L extends into the soldering region 222Ar of the terminal board 222 through the first through hole 2210.

Step 300: in the case where the rib structure 223 defines the solder flowing region at the soldering region 222Ar, the lead-out line L and the soldering region 222Ar are soldered using the solder.

As a possible implementation, as shown in fig. 22 and 23, the lead-out wire L has a soldering section L0 extending into the soldering region 222Ar, and the soldering section L0 has at least one second through hole L1. In this case, the welding of the lead line L and the welding region 222Ar with the solder includes: under the drainage of the at least one second through hole L1, the solder flows to the surface of the solder segment L0 facing away from the terminal plate 222, so that the solder rivets the solder segment L0 at the solder area 222Ar through the at least one second through hole L1.

As one possible implementation, as shown in fig. 22 and 23, when the terminal plate 222 has at least one positioning structure 226 located in the welding region 222Ar, and after the lead-out line L protrudes into the welding region 222Ar through the first through hole 2210, in the case where the bead structure 223 defines the solder flowing region in the welding region 222Ar, before the lead-out line L and the welding region 222Ar are welded with the solder, as shown in fig. 28, the method further includes: step 205: the welding segment L0 has at least one second through hole L1 that is sleeved on the corresponding positioning structure 226.

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

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

Claims

1. The junction box is characterized by being applied to a photovoltaic module with a leading-out wire; the junction box includes: the terminal board is arranged in the box body; the box body is provided with a first through hole for limiting the outgoing line, and the terminal board is positioned on one side of the first through hole; the terminal plate having a weld area and a bead structure defining a solder flow area at the weld area;

when the junction box is electrically connected with the outgoing line, the outgoing line penetrates through the first through hole and is welded in the welding area.

2. The junction box of claim 1, wherein the protruding direction of the rib structure is a direction away from a bottom surface of the box body, the bottom surface of the box body being used for contacting the photovoltaic module; wherein the content of the first and second substances,

the included angle formed by the protruding direction of the rib structure and the plate surface of the terminal plate is more than 0 degree and less than 180 degrees; or the like, or, alternatively,

the protruding direction of the rib structure is perpendicular to the plate surface of the terminal plate.

3. The terminal block of claim 1, wherein the rib structure includes two rib sections extending in a first direction, the two rib sections being spaced apart from each other in a second direction on the terminal plate, the welding region being located between the two rib sections;

the first direction is the extending direction of each edge section in the terminal board, and the second direction is the distribution direction of the two edge sections in the terminal board;

the first direction is the same as an extending direction of the lead wires in the terminal block when the terminal block and the lead wires are in an electrically connected state.

4. The junction box of claim 3, wherein each said rib has at least one end located within said terminal block or flush with a side edge of said terminal block.

5. The terminal block of claim 1, wherein the rib structure is a fully-enclosed annular rib, and the welding zone is located within a zone enclosed by the fully-enclosed annular rib.

6. The terminal block of claim 1, wherein the rib structure is a semi-closed annular rib, and the welding region is located in a region surrounded by the semi-closed annular rib.

7. The junction box of claim 6, wherein the semi-closed annular rib has a notch adjacent to the first through hole, and the lead wire is welded to the welding area through the first through hole and the notch.

8. The terminal block of claim 6, wherein the semi-closed annular rib has at least three rib segments, and a gap is provided between ends of two adjacent rib segments.

9. The junction box of claim 1, wherein said box body further has at least one retaining wall within said box body, said at least one retaining wall being located on a side of said terminal block; every the barricade is higher than the terminal block has the face of bead structure, the bead structure includes an at least arris section, at least one barricade with an at least arris section encloses into welding area.

10. The junction box according to claim 9, wherein each of said edge sections is parallel to a wall surface of each of said retaining walls in an extending direction of said terminal plate; each edge section is positioned on the first side of the welding area, and each retaining wall is positioned on the second side of the welding area; when the terminal block and the lead-out wires are in an electrically connected state, each of the ridge sections is identical to the lead-out wires in the extending direction of the terminal block.

11. The junction box according to any one of claims 1 to 10, wherein the terminal plate further has at least one protrusion for limiting the outlet, the protrusion direction of the protrusion being a direction away from a bottom surface of a box body for contacting the photovoltaic module.

12. The junction box according to any one of claims 1 to 10, wherein the side wall of the first through hole is perpendicular to both the bottom surface 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, and the bottom surface of the box body is used for contacting the photovoltaic module; and/or the presence of a gas in the gas,

the first through hole is a rectangular through hole.

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

at least one first limiting surface for inhibiting the outgoing line from deviating in the length direction;

and at least one second stopper surface for suppressing the lead-out wire from shifting in the width direction of the lead-out wire.

14. The junction box of claim 13, wherein each first limiting surface is perpendicular to a box bottom surface and a box top surface, the box bottom surface being opposite to the box top surface, the box bottom surface being configured to contact the photovoltaic module; and/or the presence of a gas in the gas,

the at least one first limiting surface comprises two first limiting surfaces which are oppositely arranged; and/or the presence of a gas in the gas,

each second limiting surface 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 for contacting the photovoltaic module; and/or the presence of a gas in the gas,

the at least one second limiting surface comprises two second limiting surfaces which are oppositely arranged; and/or the presence of a gas in the gas,

the first limiting surface is intersected with the second limiting surface.

15. A photovoltaic module comprising a terminal box according to any one of claims 1 to 14 and a lead wire; the lead-out wire passes through the first through hole and is welded in the welding area.

16. The assembly defined in claim 15, wherein the lead-out wire has a solder segment extending into the solder region, the solder segment having at least one second through-hole, the assembly further comprising a solder that rivets the solder segment to the solder region through the at least one second through-hole.

17. The assembly according to claim 16, wherein when the junction box includes a terminal plate having at least one locating structure located at the welding zone, each of the second through holes is sleeved on the corresponding locating structure; the aperture of each second through hole is larger than or equal to the maximum radial dimension of the corresponding positioning structure; and/or the presence of a gas in the gas,

at least one of the second through holes is an open through hole or a closed through hole.

18. The photovoltaic module according to any one of claims 15 to 17, wherein the lead-out wire has a soldering section protruding into the soldering region, and a surface of the soldering section facing the terminal plate has a curved surface and/or a serrated surface.

19. A wiring method using the terminal box according to any one of claims 1 to 14, the wiring method comprising:

providing a photovoltaic module with an outlet;

under the condition that the first through hole limits the outgoing line, the outgoing line extends into a welding area of the terminal plate through the first through hole;

and welding the lead-out wire and the welding area by using the welding agent under the condition that the welding agent flowing area is defined in the welding area by the rib structure.

20. The wiring method according to claim 19, wherein the lead-out wire has a soldering section projecting into the soldering region, the soldering section having at least one second through hole; wherein the content of the first and second substances,

the welding of the lead-out wire and the welding area with the welding agent includes: under the drainage action of at least one second through hole, the welding agent flows to the surface of the welding section, which faces away from the terminal plate, so that the welding agent rivets the welding section on the welding area through the at least one second through hole;

and/or the presence of a gas in the gas,

when the terminal plate has at least one positioning structure located at the welding region, the lead wire extending into the welding region through the first through hole, and before welding the lead wire and the welding region with a solder in a state where the bead structure defines a solder flow region at the welding region, the wiring method further includes: and sleeving at least one second through hole of the welding section on the corresponding positioning structure.