CN216959799U - Junction box and photovoltaic module - Google Patents

Abstract

The utility model discloses a junction box and a photovoltaic module, and relates to the technical field of photovoltaic modules, in order to improve the reliability of connection between a bus bar and a bonding pad and avoid cold joint caused by rebound of the bus bar, wherein the junction box comprises a box body, a conductor and a bonding pad; the electric conductor is arranged in the box body, and the bonding pad is arranged on the electric conductor and is used for connecting the bus bar; lead wire holes and locating holes are formed in the bonding pad and are arranged at intervals, the lead wire holes are used for leading in the bus bars, and the locating holes are used for bending and inserting the led-in bus bars into the locating holes to be fixed. The junction box and the photovoltaic module provided by the utility model are used for manufacturing the photovoltaic module.

Description

Junction box and photovoltaic module

Technical Field

The utility model relates to the technical field of photovoltaic modules, in particular to a junction box and a photovoltaic module.

Background

The junction box is a component for connecting an output circuit inside the photovoltaic module with an external circuit, the junction box is usually bonded on the surfaces of a back plate and a back glass of the photovoltaic module by organic silicon adhesive, and after positive and negative bus bars are led out from the photovoltaic module and enter the junction box, the surface of a bonding pad and the surface of the bus bar are welded together in a hot soldering tin mode.

At present, in photovoltaic module production manufacturing process, the rosin joint condition that often takes place to connect insecure arouses because of pad and busbar adopts to increase protruding locking structure on the pad generally and avoids the busbar resilience, and not only technology is complicated, and the terminal box cost rises obviously moreover.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a junction box and a photovoltaic module, which are used for reducing the false welding condition of the junction box.

In order to achieve the above purpose, the utility model provides the following technical scheme:

in a first aspect, the present invention discloses a junction box, comprising: a box body;

the electric conductor is arranged in the box body;

the pad is arranged on the electric conductor and used for connecting the bus bars, the pad is provided with lead holes and positioning holes which are arranged at intervals, the lead holes are used for leading in the bus bars, and the positioning holes are used for bending and inserting the led-in bus bars into the positioning holes for fixation.

Compared with the prior art, the lead holes and the positioning holes are formed in the bonding pad, the bus bars are led in from the lead holes, and then the bus bars are bent and inserted into the positioning holes to lock the bus bars, so that the bus bars are tightly attached to the bonding pad after welding, the welding is firm, no resilience is generated, the welding of the bus bars and the bonding pad is facilitated, the relative movement between the bonding pad and the bus bars can be reduced, and the false welding condition is avoided.

In some implementations, the pad is further provided with a trap hole located between the wire hole and the positioning hole and at one or both ends of the wire hole for guiding the excess molten solder into the bottom of the pad during soldering. In this case, the excessively melted solder can be made to flow into the bottom of the pad, thereby preventing a short circuit caused by excessive solder.

In some implementations, the solder pad surface is provided with a solder bump in a protruding manner for mating connection with a bus bar provided with a connecting through hole. At the moment, the bonding pad and the bus bar are fixed in an unwelded state; and the design of the positioning hole is combined, so that insufficient cold solder caused by the rebound of the bus bar and insufficient soldering tin can be avoided.

In a second aspect, the utility model discloses a photovoltaic module, which comprises a battery string, a bus bar and a junction box, wherein the junction box is the junction box described in the first aspect.

With the advantages of the photovoltaic module provided by the second aspect and including the bus bar and the junction box, it will not be further described herein with reference to the advantages described in the first aspect.

In some implementations, the solder bumps are raised on the surface of the bonding pad of the junction box; the end of the bus bar is provided with a connecting through hole matched with the soldering tin lug. At the moment, the bus bar is provided with the connecting through hole, and the soldering tin bump matched with the bus bar is arranged on the soldering pad of the junction box, so that the soldering tin bump is conveniently inserted into the connecting through hole during welding, and the soldering pad and the bus bar are fixed in an unwelded state; due to the design of the positioning holes, insufficient soldering caused by the rebound of the bus bar and insufficient soldering tin can be avoided; then the soldering tin on the surface of the bonding pad and the bus bar is melted by heating, and then the melted soldering tin is cooled, so that the purpose of tightly connecting the junction box and the bus bar is achieved, the risk of false welding of the assembly is reduced, and the welding firmness is improved.

In some implementations, the bus bar includes a first bending section and a second bending section, the first bending section is tightly attached to the pad, the connection through hole is formed in the first bending section, and the second bending section is inserted into the positioning hole to fixedly connect the bus bar with the pad. At this moment, through buckling the busbar, closely fix connect through-hole and pad, then buckle once more and make the busbar insert the downthehole locking of locating, ensure that the busbar can not produce any resilience, the welding of the busbar of being convenient for and pad.

In some implementations, the height of the solder bump is greater than the thickness of the bus bar. On the one hand, the fixing effect of the welding pad on the bus bar is improved when the welding is not carried out, the possibility that the bus bar falls off accidentally is reduced, on the other hand, when the welding is carried out, sufficient soldering tin can be provided to enhance the reliability of connection, and the condition of insufficient soldering is avoided.

In some implementations, a plurality of solder bumps are uniformly disposed on the pad, and a plurality of connection through holes are disposed and correspond to the solder bumps one by one. At the moment, the matching mode of the plurality of soldering tin lugs and the connecting through holes is adopted, the possibility of relative movement between the bus bar and the bonding pad is greatly reduced, the welding firmness is improved, and the safety and stability of the photovoltaic module are improved.

In some implementations, the solder bump has a shape of one of a cylinder, a cone, a polygonal pyramid, and a polygonal prism, and the corresponding connection through hole has a shape of one of a circle, a cone, and a polygon.

In some implementations, the solder bump is made of any one of tin, tin-lead alloy, tin-lead-silver alloy, tin-antimony alloy, and tin-lead-antimony alloy. When the soldering tin contains non-melting materials, the protrusion can play double roles of welding and clamping fixation.

Drawings

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

Fig. 1 is a schematic structural view of the junction box of the present invention.

FIG. 2 is a schematic view of the connection structure of the bus bar and the bonding pad according to the present invention.

Fig. 3-4 are schematic structural diagrams of the connecting through hole in the embodiment of the present invention.

Fig. 5-6 are schematic views of solder structures according to embodiments of the utility model.

In the figure:

1-box body; 2-an electrical conductor; 3-a bonding pad; 31-solder bumps; 4-a lead hole; 5-positioning holes; 6-a bus bar; 61-a first bend section; 7-intercepting the hole; 8-connecting through holes.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

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.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; 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.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The embodiment of the utility model discloses a junction box, as shown in figure 1, comprising: the box body 1, the electric conductor 2 and the welding disc 3; the electric conductor 2 is arranged in the box body 1, the pad 3 is arranged on the electric conductor 2 and used for being connected with the bus bar 6, the pad 3 is provided with lead holes 4 and positioning holes 5 which are arranged at intervals, the lead holes 4 are used for leading in the bus bar 6, and the positioning holes 5 are used for bending and inserting the led-in bus bar 6 into the positioning holes 5 for fixation.

In actual work, firstly, the bus bar 6 is led in from the lead hole 4 of the pad 3, the bus bar 6 is tightly attached to the pad 3 through bending, and then the bus bar 6 is bent and inserted into the positioning hole 5, so that the bus bar 6 is fixedly connected with the pad 3 before welding.

According to the technical scheme and the implementation process, when the bus bar 6 is connected with the junction box, the lead hole 4 and the positioning hole 5 are formed in the bonding pad 3, the introduced bus bar 6 is bent and inserted into the positioning hole 5 to be locked, the bonding pad 3 and the bus bar 6 can be connected before welding, compared with the conventional design, the bus bar 6 in the technical scheme cannot generate any springback, the bonding of the bus bar 6 and the bonding pad 3 is facilitated, the bus bar 6 is ensured to be tightly attached to the bonding pad 3 after welding, and the condition of insufficient welding cannot be generated.

The shapes of the lead holes 4 and the positioning holes 5 should be adapted to the cross-sectional shape of the bus bar 6, so as to minimize the relative movement of the bus bar 6 in the holes and ensure the reliability of the connection between the bus bar 6 and the pad 3.

Preferably, the land 3 is further provided with a cut-out hole 7, and the cut-out hole 7 is located between the lead hole 4 and the positioning hole 5, at one end or both ends of the lead hole 4, and is used for introducing an excessively molten solder into the bottom of the land 3 during soldering. In this case, the excessive solder can be made to flow into the bottom of the land 3, and the occurrence of short circuit of the component due to excessive solder can be prevented.

Optionally, the interception hole 7 is communicated with the lead hole 4, so that the lead hole 4 and the interception hole 7 can be formed at one time.

The embodiment of the utility model also discloses a photovoltaic module which comprises a battery string, the bus bar 6 and the junction box. When the photovoltaic module is used, the junction box is bonded on the surfaces of a back plate and a back glass of the photovoltaic module by organic silicon adhesive, the positive and negative electrodes of the battery string are led out through the bus bar 6, and then the bus bar 6 is led into the junction box and then connected with the bonding pad 3 in a hot soldering tin mode.

Based on the above structure, the photovoltaic module including the junction box described above has the advantages generated during the connection of the bus bar 6 and the junction box, which refer to the advantages related to the junction box described above, and it is not further needless to say here.

Furthermore, a soldering tin bump 31 is convexly arranged on the surface of the welding pad 3 of the junction box; the end of the bus bar 6 is provided with a connecting through hole 8 adapted to the solder bump 31.

In the actual work, introduce the back with busbar 6 from pin hole 4 of pad 3, accessible soldering tin lug 31 and connect the cooperation of through hole 8, to busbar 6 further location connection, then, paste busbar 6 and pad 3 through buckling tightly, buckle busbar 6 again and insert in locating hole 5, realize busbar 6 and pad 3 fixed connection before the welding, adopt this scheme, but furthest's avoiding is because of the emergence of the insufficient rosin joint condition that leads to of busbar 6 resilience and soldering tin, photovoltaic module's quality and life have been promoted.

Known through above-mentioned technical scheme and implementation process, through seting up connect the via hole 8 at the busbar 6, and set up the soldering tin lug 31 rather than the adaptation on the pad 3 of terminal box, insert soldering tin lug 31 in connect the via hole 8, realize avoiding appearing relative movement to fix soldering tin 3 and busbar 6 under unwelded state and influence welding quality, later make the soldering tin melting on pad 3 and busbar 6 surface through the heating again, then make the cooling of molten soldering tin, reach terminal box and busbar 6 inseparable welded purpose, reduce the risk of subassembly rosin joint, improve the firm degree of welding.

In some embodiments, as shown in fig. 2, the bus bar 6 includes a first bending section 61 and a second bending section, the first bending section 61 is tightly attached to the pad 3, the connection through hole 8 is disposed on the first bending section 61, and the second bending section is inserted into the positioning hole 5 to fixedly connect the bus bar 6 and the pad 3. At this moment, through buckling the bus bar 6, stick to the bus bar 6 with the pad 3 closely earlier, improve the reliability of being connected of bus bar 6 and pad 3 under the circumstances of connect the via hole 8 with the cooperation of soldering tin lug 31, then buckle once more and make the bus bar 6 insert the locking in the locating hole 5, ensure that the bus bar 6 can not produce any resilience, the welding of the bus bar 6 of being convenient for and pad 3.

Preferably, the height of the solder bump 31 is greater than the thickness of the bus bar 6. On one hand, the fixing effect of the welding disc 3 on the bus bar 6 is improved when the welding disc is not welded, the possibility that the bus bar 6 falls off accidentally is reduced, and on the other hand, enough soldering tin can be provided when the welding disc and the bus bar are welded to enhance the reliability of connection.

Preferably, a plurality of solder bumps 31 are uniformly arranged on the pad 3, and a plurality of connecting through holes 8 are arranged, corresponding to the solder bumps 31 one by one. Adopt a plurality of soldering tin lugs 31 and connect the adaptation of through hole 8, reduced the possibility that relative motion took place for busbar 6 and pad 3 by a wide margin, improved welded fastness and photovoltaic module's safety and stability.

In some embodiments, as shown in fig. 3 to 6, the shape of the solder bump 31 is preferably a regular shape, and may be one of a cylinder, a cone, a polygonal pyramid and a polygonal prism, such as a cone, a cube, a cuboid, a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, and a polygonal pyramid, such as a triangular pyramid, a quadrangular pyramid, a pentagonal pyramid.

The shape of the corresponding connecting through-hole 8 is one of circular, conical and polygonal, such as circular, square, rectangular, triangular, quadrangular, pentagonal, hexagonal, and the like polygonal.

In some embodiments, the solder bump 31 is made of any one of tin, tin-lead alloy, tin-lead-silver alloy, tin-antimony alloy, and tin-lead-antimony alloy, and when the solder bump 31 contains a non-melting material, the solder bump 31 is partially melted by heating, so as to achieve the dual effects of "welding and clamping.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A junction box, comprising:

a box body;

a conductive body disposed in the case;

the welding plate is arranged on the electric conductor and used for being connected with the bus bars, lead holes and positioning holes are formed in the welding plate and are arranged at intervals, the lead holes are used for leading in the bus bars, and the positioning holes are used for bending and inserting the led-in bus bars into the positioning holes for fixation.

2. The terminal block according to claim 1, wherein the pad is further provided with a cut-out hole between the lead hole and the positioning hole at one or both ends of the lead hole for introducing an excessive amount of molten solder to a bottom of the pad at the time of soldering.

3. The junction box of claim 1, wherein the pad surface projection is provided with a solder bump for mating connection with a bus bar provided with a connecting through hole.

4. A photovoltaic module comprising a string of cells, a busbar and a junction box, wherein the junction box is according to any one of claims 1 to 3.

5. The photovoltaic module according to claim 4, wherein the solder bumps are protruded on the surface of the bonding pad of the junction box;

and the end part of the bus bar is provided with a connecting through hole matched with the soldering tin lug.

6. The photovoltaic module according to claim 5, wherein the bus bar includes a first bent section and a second bent section, the first bent section is closely attached to the pad, the connecting through hole is disposed on the first bent section, and the second bent section is inserted into the positioning hole to fixedly connect the bus bar with the pad.

7. The photovoltaic module of claim 5, wherein the solder bumps have a height greater than a thickness of the bus bar.

8. The photovoltaic module according to claim 5, wherein a plurality of the solder bumps are uniformly disposed on the pad, and a plurality of the connection through holes are disposed and correspond to the solder bumps one by one.

9. The photovoltaic module of claim 5, wherein the solder bump is one of a cylinder, a cone, a polygonal pyramid and a polygonal prism, and the connecting through hole is one of a circle, a cone and a polygon.

10. The photovoltaic module according to claim 5, wherein the solder bump is made of any one of tin, tin-lead alloy, tin-lead-silver alloy, tin-antimony alloy, and tin-lead-antimony alloy.

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