A photovoltaic junction box

Abstract

This utility model belongs to the field of solar photovoltaic technology, and particularly relates to a photovoltaic junction box. The photovoltaic junction box provided by this utility model connects the resistance-welded and laser-welded terminals to the diode pins and busbar respectively, shortening the distance between the busbar and the diode, improving the conductivity of both. Furthermore, the connection of the busbar to the laser-welded terminal reduces solder usage and lowers production costs. When the laser-welded and resistance-welded terminals are not coplanar, the diode pins and busbar are placed on the same side of the terminal; or when they are coplanar, the diode pins and busbar are placed on opposite sides of the terminal. Both methods ensure that the diode pins and busbar are not coplanar, allowing the busbar to be welded to the laser-welded terminal without disturbing the diode pins, facilitating laser welding and improving welding quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of solar photovoltaic technology, and in particular to a photovoltaic junction box. Background Technology

[0002] A photovoltaic junction box is a connector between a photovoltaic array composed of photovoltaic cell modules and a photovoltaic cell charging control device. Its main function is to connect and protect the solar photovoltaic modules, connect the power generated by the photovoltaic cells to the external line, and conduct the electrical energy generated by the photovoltaic cell modules through cables.

[0003] Traditional photovoltaic (PV) junction boxes typically include a base, terminals, diodes, and a cover. The terminals are soldered to the diode leads, the diode with the soldered terminals is placed inside the base, the busbar is then soldered to the terminals, and finally, adhesive is poured into the base before the cover is fastened onto it. Existing PV junction boxes have complex terminal structures that need to satisfy both conductivity and heat dissipation functions, increasing material costs. Furthermore, after the terminals are soldered to the diode leads and placed inside the base, it is difficult to solder the busbar to the terminals, thus affecting production efficiency. Additionally, existing PV junction boxes are not suitable for laser welding of the busbar. Utility Model Content

[0004] The purpose of this utility model is to provide a photovoltaic junction box that simplifies the terminal structure, reduces material costs, facilitates the welding of busbars, and is suitable for laser welding of busbars, thereby improving production quality and efficiency.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A photovoltaic junction box includes a diode and a terminal. The terminal includes a resistance-welded connection portion and a laser-welded connection portion connected to the resistance-welded connection portion. The resistance-welded connection portion is resistance-welded to the pins of the diode. The laser-welded connection portion is used to laser-weld to a busbar. The laser-welded connection portion and the resistance-welded connection portion are not coplanar. The pins of the diode and the busbar are located on the same side of the terminal, or the laser-welded connection portion and the resistance-welded connection portion are coplanar. The pins of the diode and the busbar are located on opposite sides of the terminal.

[0007] As an optional technical solution for the aforementioned photovoltaic junction box, the resistance welding connection part includes a connecting plate, the laser welding connection part has a plate-like structure, one end of the connecting plate is bent and connected to one end of the laser welding connection part, the diode pins are welded to the side of the connecting plate facing the laser welding connection part, and the busbar is welded to the side of the laser welding connection part away from the connecting plate.

[0008] As an optional technical solution for the aforementioned photovoltaic junction box, both the resistance-welded connection and the laser-welded connection are plate-shaped structures and are arranged on the same plane. The diode pins are welded to one side of the resistance-welded connection, and the busbar is welded to the side of the laser-welded connection away from the diode pins.

[0009] As an optional technical solution for the aforementioned photovoltaic junction box, the terminal further includes a cable connection part, which is connected to the laser welding connection part and is disposed opposite to the resistance welding connection part. The cable connection part is electrically connected to a cable.

[0010] As an optional technical solution for the aforementioned photovoltaic junction box, the cable connection part has a plate-like structure, and one end of the cable connection part is bent and connected to the laser welding connection part;

[0011] And / or, the side of the cable connector that is connected to the cable has a protruding ridge;

[0012] And / or, the width of the cable connection is smaller than that of the laser-welded connection, and the width of the laser-welded connection is equal to that of the resistance-welded connection.

[0013] As an optional technical solution for the aforementioned photovoltaic junction box, the photovoltaic junction box further includes a heat sink, which includes a welding part. When the laser-welded connection part and the resistance-welded connection part are not coplanar, the resistance-welded connection part is placed between the diode pin and the welding part. When the laser-welded connection part and the resistance-welded connection part are coplanar, the diode pin is placed between the resistance-welded connection part and the welding part.

[0014] As an optional technical solution for the aforementioned photovoltaic junction box, the welding part includes a welding plate, the surface of which is provided with a plurality of grooves at intervals, and the diode pins or the resistance welding connection part are welded to the side surface of the welding plate provided with the grooves.

[0015] As an optional technical solution for the aforementioned photovoltaic junction box, a first heat sink is provided on both sides of the welding part, and the first heat sink extends toward the side where the diode pin is located.

[0016] As an optional technical solution for the aforementioned photovoltaic junction box, the heat dissipation component further includes a connecting part, one end of which is connected to one end of the welding part. A second heat dissipation plate is provided on both opposite sides of the connecting part. The second heat dissipation plate is set at an angle to the connecting part and extends in a direction away from the connecting part. The laser welding connecting part is placed between the two second heat dissipation plates, and the second heat dissipation plate is set higher than the laser welding connecting part.

[0017] As an optional technical solution for the aforementioned photovoltaic junction box, the photovoltaic junction box further includes a base, the heat sink is disposed inside the base, and the connecting part is fitted to the bottom wall of the base;

[0018] And / or, the projected area of ​​the connecting part on the bottom wall of the base is greater than the projected area of ​​the welding part on the bottom wall of the base.

[0019] As an optional technical solution for the aforementioned photovoltaic junction box, a third heat sink is provided at the other end of the connection portion. The third heat sink is set at an angle to the connection portion, and extends in a direction away from the connection portion. The third heat sink is set higher than the laser-welded connection portion.

[0020] The beneficial effects of this utility model are:

[0021] The photovoltaic junction box provided by this utility model connects the resistance-welded and laser-welded terminals to the diode pins and busbar respectively, shortening the distance between the busbar and the diode, improving the conductivity of the busbar and diode, and realizing the conductive connection of the diode, terminal, and busbar. Furthermore, the busbar is connected to the laser-welded terminal via laser welding, replacing tin soldering, reducing solder usage and production costs. In addition, the heat generated by the diode during operation can be conducted to the busbar and then dissipated from the photovoltaic junction box, achieving efficient heat dissipation. When the laser-welded and resistance-welded terminals are not coplanar, the diode pins and busbar are placed on the same side of the terminal; or when they are coplanar, the diode pins and busbar are placed on opposite sides of the terminal. Both methods ensure that the diode pins and busbar are not coplanar, allowing the busbar to be welded to the laser-welded terminal without touching the diode pins, facilitating laser welding between the busbar and the laser-welded terminal, improving welding quality and production efficiency. Attached Figure Description

[0022] Figure 1 This is an exploded view of a positive-type photovoltaic junction box provided in an embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the base provided in this embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of a structure for connecting a heat sink, a terminal, and a diode according to an embodiment of this utility model;

[0025] Figure 4 This is another structural schematic diagram of the connection between the heat sink, terminals, and diode provided in this embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of the first structure of the terminal provided in this embodiment of the present utility model;

[0027] Figure 6 This is a schematic diagram of the second structure of the terminal provided in this embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the base filled with insulating glue according to an embodiment of the present utility model;

[0029] Figure 8 This is a schematic diagram of the structure of the base with a box cover attached, provided in an embodiment of the present utility model;

[0030] Figure 9 This is a schematic diagram of the third structure of the terminal provided in this embodiment of the present invention;

[0031] Figure 10 This is a front view of the third structure of the terminal provided in this embodiment of the present invention;

[0032] Figure 11 This is a schematic diagram of the connection structure of the diode, connecting plate, and welding part provided in an embodiment of the present invention;

[0033] Figure 12 This is a cross-sectional view of the internal structure of a base provided in an embodiment of this utility model;

[0034] Figure 13 This is a schematic diagram of a heat dissipation component provided in an embodiment of the present invention;

[0035] Figure 14 This is a schematic diagram of another structure of the heat dissipation component provided in this embodiment of the utility model;

[0036] Figure 15 This is an exploded view of a photovoltaic junction box of the intermediate electrode type provided in this embodiment of the present invention;

[0037] Figure 16 This is an exploded view of a negative-type photovoltaic junction box provided in an embodiment of this utility model;

[0038] Figure 17 This is a schematic diagram of the fourth structure of the terminal provided in this embodiment of the present invention;

[0039] Figure 18 This is a front view of the fourth structure of the terminal provided in this embodiment of the present invention;

[0040] Figure 19 This is a schematic diagram of the connection structure of the resistance welding connection part, the diode and the welding part provided in the embodiment of this utility model;

[0041] Figure 20This is a cross-sectional view of another internal structure of the base provided in this embodiment of the utility model;

[0042] Figure 21 This is an exploded view of another type of photovoltaic junction box with intermediate electrode provided in this embodiment of the present invention;

[0043] Figure 22 This is an exploded view of another type of positive electrode photovoltaic junction box provided in this embodiment of the present invention;

[0044] Figure 23 This is an exploded view of another type of photovoltaic junction box for negative electrodes provided in this embodiment of the present invention.

[0045] In the picture:

[0046] 1. Diode; 2. Heat sink; 3. Terminal; 4. Busbar; 5. Cable; 6. Base; 7. Cover; 8. Wire clamp; 9. Insulating adhesive;

[0047] 21. Welding part; 211. Groove; 22. First heat sink plate; 23. Connecting part; 24. Second heat sink plate; 25. Third heat sink plate;

[0048] 31. Resistance welded joint; 311. Connecting plate; 32. Laser welded joint; 33. Cable joint. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0050] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0053] like Figures 1 to 6 As shown, this embodiment provides a photovoltaic junction box, which includes a diode 1 and a terminal 3. The terminal 3 includes a resistance-welded connection part 31 and a laser-welded connection part 32 connected to the resistance-welded connection part 31. The resistance-welded connection part 31 is welded to the pins of the diode 1 by resistance welding. The laser-welded connection part 32 is used to weld to the busbar 4 by laser welding. The laser-welded connection part 32 and the resistance-welded connection part 31 are not coplanar. The pins of the diode 1 and the busbar 4 are placed on the same side of the terminal 3, or the laser-welded connection part 32 and the resistance-welded connection part 31 are coplanar. The pins of the diode 1 and the busbar 4 are placed on opposite sides of the terminal 3.

[0054] The resistance-welded connection 31 and laser-welded connection 32 of terminal 3 are respectively connected to the pin of diode 1 and busbar 4, realizing the conductive connection of diode 1, terminal 3 and busbar 4. This shortens the distance between busbar 4 and diode 1, improves the conductivity of busbar 4 and diode 1, and the connection of busbar 4 to laser-welded connection 32 via laser welding replaces soldering, saving the cost of solder and thus reducing production costs. In addition, the heat generated by diode 1 during operation can be conducted to busbar 4, and the heat is conducted out of the photovoltaic junction box from busbar 4, playing a role in high efficiency. The diode 1 has the effect of heat dissipation. When the laser-welded connection part 32 and the resistance-welded connection part 31 are not coplanar, the pin of the diode 1 and the bus 4 are placed on the same side of the terminal 3. Alternatively, when the laser-welded connection part 32 and the resistance-welded connection part 31 are coplanar, the pin of the diode 1 and the bus 4 are placed on opposite sides of the terminal 3. Both of these methods make the pin of the diode 1 and the bus 4 not coplanar. When the bus 4 is welded to the laser-welded connection part 32, the pin of the diode 1 can be avoided, which facilitates the laser welding of the bus 4 and the laser-welded connection part 32, thereby improving the welding quality and production efficiency.

[0055] Diode 1 has two pins. Each pin of diode 1 is respectively provided with a terminal 3 and a bus 4, so that the current flows sequentially through the first bus 4, the first terminal 3, the first pin of diode 1, diode 1, the second pin of diode 1, the second terminal 3 and the second bus 4.

[0056] See Figure 3 and Figure 4 As shown, the photovoltaic junction box also includes a heat sink 2, with each pin of the diode 1 corresponding to a heat sink 2. The heat sink 2 includes a welding portion 21. When the laser-welded connection portion 32 and the resistance-welded connection portion 31 are not coplanar, the resistance-welded connection portion 31 is placed between the pin of the diode 1 and the welding portion 21. When the laser-welded connection portion 32 and the resistance-welded connection portion 31 are coplanar, the pin of the diode 1 is placed between the resistance-welded connection portion 31 and the welding portion 21. The heat generated by the diode 1 during operation can be dissipated through the heat sink 2, improving the heat dissipation efficiency of the diode 1 and thus enhancing the heat dissipation performance of the photovoltaic junction box. The heat sink 2 also serves to fix and support the pin of the diode 1 and the terminal 3. Furthermore, by using the heat sink 2 to dissipate heat from the diode 1, the terminal 3 only serves as an intermediate transition connection; the terminal 3 does not need to bear the main heat dissipation function, allowing for a relatively smaller size and simplified structure.

[0057] See Figure 2 As shown, the photovoltaic junction box also includes a base 6, with the diode 1 and heat sink 2 housed within the base 6. The bottom of the base 6 has a through-hole, through which one end of the busbar 4 passes and connects to the other end of the terminal 3. Specifically, in conjunction with... Figure 1 and Figure 2As shown, one end of the busbar 4 is bent into a U-shape. The busbar 4 is placed on the upper surface of the terminal 3 and welded to the terminal 3 by laser welding to achieve a conductive connection between the busbar 4 and the terminal 3, thereby realizing the electrical connection between the photovoltaic junction box and the photovoltaic cell. During assembly, the pins of the diode 1, the terminal 3, and the welding part 21 of the heat sink 2 are first welded by resistance welding. Then, the welded diode 1, terminal 3, and heat sink 2 are placed in the base 6. When using the photovoltaic junction box, one end of the busbar 4 is threaded through a through hole and welded to the other end of the terminal 3 by laser welding. Since the busbar 4 covers the upper surface of the terminal 3, laser welding is used instead of soldering the busbar 4, which reduces production costs and facilitates welding the busbar 4 to the terminal 3.

[0058] like Figure 7 As shown, the base 6 is filled with insulating glue 9. The heat generated by the diode 1 when it is working can be dissipated to the outside of the photovoltaic junction box through the heat sink 2, the insulating glue 9, and the side wall of the base 6 in sequence. The insulating glue 9 also serves to fix the diode 1, the heat sink 2, the terminal 3, and the busbar 4.

[0059] like Figure 8 As shown, the photovoltaic junction box also includes a cover 7. After the insulating glue 9 is poured into the base 6, the cover 7 is fastened onto the base 6 to protect the insulating glue 9 inside the base 6.

[0060] In some embodiments, combined with Figure 5 , Figure 9 and Figure 10 As shown, the resistance-welded connection 31 includes a connecting plate 311, and the laser-welded connection 32 has a plate-like structure. One end of the connecting plate 311 is bent and connected to one end of the laser-welded connection 32. The pins of the diode 1 are welded to the side of the connecting plate 311 facing the laser-welded connection 32, and the busbar 4 is welded to the side of the laser-welded connection 32 away from the connecting plate 311. The resistance-welded connection 31 and the laser-welded connection 32 are not coplanar, and the pins of the diode 1 and the busbar 4 can be placed on the same side. The pins of the diode 1 will not interfere with the welding of the busbar 4 to the laser-welded connection 32.

[0061] like Figure 11 and Figure 12As shown, the welding portion 21 of the heat sink 2 includes a welding plate. Multiple grooves 211 are spaced apart on the surface of the welding plate. The pins of the diode 1 or the resistance welding connection portion 31 is welded to the side surface of the welding plate with the grooves 211. When the resistance welding connection portion 31 and the laser welding connection portion 32 are not coplanar, the resistance welding connection portion 31 is positioned between the pins of the diode 1 and the welding portion 21 of the heat sink 2. Specifically, multiple connection plates 311 can be provided, spaced apart, positioned between the pins of the diode 1 and the welding plate, and inserted into the grooves 211. During resistance welding, the molten metal can fill the grooves 211 and the space between the connection plates 311 and the pins of the diode 1, improving the reliability of the connection between the welding plate, the connection plate 311, and the pins of the diode 1.

[0062] The groove 211 can be divided into two types. The inner diameter of one type of groove 211 is larger than that of the other type of groove 211. The groove 211 with the larger inner diameter matches the size of the connecting plate 311.

[0063] Combination Figure 9 , Figure 10 and Figure 12 As shown, terminal 3 also includes a cable connection part 33, which is connected to the laser welding connection part 32 and is disposed opposite to the resistance welding connection part 31. The cable connection part 33 is conductively connected to a cable 5. The cable 5 is used to connect to the circuit outside the photovoltaic junction box, thereby realizing the connection between the photovoltaic junction box and the external circuit.

[0064] Cable 5 passes through the side wall of base 6. One end of cable 5 is placed inside base 6 and connected to cable connector 33, while the other end of cable 5 is placed outside base 6 for connection to external circuitry. The side wall of base 6 has an opening for cable 5 to pass through. A wire clamp 8 is also connected to base 6. The wire clamp 8 is connected to the outer wall of base 6 to cooperate with base 6 to fix cable 5 to base 6, preventing cable 5 from being dragged and detached from cable connector 33.

[0065] For terminal 3 with cable connection portion 33, cable connection portion 33 has a plate-like structure. One end of cable connection portion 33 is bent and connected to the other end of laser welding connection portion 32. Cable connection portion 33 is set higher than laser welding connection portion 32. Resistance welding connection portion 31, laser welding connection portion 32 and cable connection portion 33 form a stepped shape to facilitate welding of cable connection portion 33 to cable 5. To improve the reliability of the connection between cable 5 and cable connection portion 33, a protruding ridge is provided on the side of cable connection portion 33 where it connects to cable 5. Optionally, the width of cable connection portion 33 is smaller than that of laser welding connection portion 32 to reduce production costs and ensure a stable connection between cable 5 and cable connection portion 33. The width of laser welding connection portion 32 is equal to that of resistance welding connection portion 31 to ensure the reliability of the connection between bus 4 and laser welding connection portion 32, as well as the reliability of the connection between diode 1 pin and resistance welding connection portion 31.

[0066] The terminal 3, which is composed of resistance welded connection part 31 and laser welded connection part 32, or the terminal 3 composed of resistance welded connection part 31, laser welded connection part 32 and cable connection part 33, is an integrally formed structure and can be formed into a stepped shape by stamping process.

[0067] like Figure 13 and Figure 14 As shown, to improve the heat dissipation efficiency of the heat sink 2, first heat sink plates 22 are provided on both opposite sides of the welding part 21. The first heat sink plates 22 extend towards the side where the welding part 21 is welded to the pins of the diode 1. The heat generated by the diode 1 during operation is transferred to the first heat sink plate 22 through the pins of the diode 1 and the welding part 21, and then dissipated to the outside through the insulating adhesive 9 and the side wall of the base 6, further improving the heat dissipation performance of the photovoltaic junction box. Optionally, the first heat sink plate 22 is connected to the edge of the welding plate of the welding part 21, and the first heat sink plate 22 is perpendicular to the welding plate, so that the heat sink 2 can be installed into the base 6 without affecting the connection between the pins of the diode 1 and the welding plate. In addition, the first heat sink plate 22 also plays a shielding role. During the resistance welding process, the first heat sink plate 22 can block the molten metal from flowing to both sides, reduce the loss of molten metal, and ensure the effective welding area.

[0068] The heat sink 2 also includes a connecting portion 23, one end of which is connected to one end of the welding portion 21. Second heat sinks 24 are provided on opposite sides of the connecting portion 23, forming an angle with the connecting portion 23 and extending away from the connecting portion 23. A laser-welded connecting portion 32 is positioned between the two second heat sinks 24, with the second heat sinks 24 positioned higher than the laser-welded connecting portion 32. The heat generated by the diode 1 during operation can also be dissipated through the connecting portion 23 and the two second heat sinks 24. Heat can also be dissipated to the outside through the connecting portion 23, the insulating adhesive 9, and the bottom wall of the base 6, as well as through the side walls of the connecting portion 23, the two second heat sinks 24, the insulating adhesive 9, and the base 6, further improving the heat dissipation performance of the photovoltaic junction box. During laser welding of the busbar 4, the second heat sink 24 can also prevent welding sparks from splashing outwards, protecting other components inside the photovoltaic junction box from damage, preventing burns to the interior of the base 6, and reducing the dielectric strength of the bonding area between the inner wall of the base 6 and the insulating adhesive 9 after the base 6 is filled with insulating adhesive. The connecting part 23 can be a plate-like structure, with one end of the connecting part 23 connected to one end of the welding plate. The area of ​​the connecting part 23 is larger than the area of ​​the welding plate to maximize the heat dissipation area. The second heat sink 24 is connected to the edge of the connecting part 23 and is perpendicular to the connecting part 23 to facilitate the installation of the heat sink 2 into the base 6.

[0069] The heat sink 2 is disposed inside the base 6, and the connecting part 23 is attached to the bottom wall of the base 6. The connecting part 23 serves as the main heat dissipation part of the heat sink 2. The connecting part 23 is located close to the bottom wall of the base 6 to improve heat dissipation efficiency.

[0070] Furthermore, the projected area of ​​the connecting part 23 on the bottom wall of the base 6 is larger than the projected area of ​​the welding part 21 on the bottom wall of the base 6, and the connecting part 23 undertakes the main heat dissipation function.

[0071] Optionally, a third heat sink 25 is provided at the other end of the connecting portion 23. The third heat sink 25 is set at an angle to the connecting portion 23 and extends away from the connecting portion 23. The third heat sink 25 is set higher than the laser-welded connecting portion 32. The heat generated by the diode 1 during operation can be dissipated to the outside through the connecting portion 23, the third heat sink 25, the insulating adhesive 9, and the sidewall of the base 6, further improving the heat dissipation performance of the photovoltaic junction box. When laser welding the busbar 4, the third heat sink 25 can also prevent the welding sparks from splashing outward, protecting other components inside the photovoltaic junction box from damage, preventing burns to the inside of the base 6, and reducing the dielectric strength of the bonding area between the inner wall of the base 6 and the insulating adhesive 9 after the insulating adhesive is potted inside the base 6. The third heat sink 25 can be connected to the edge of the connecting portion 23, and the third heat sink 25 is perpendicular to the connecting portion 23 to facilitate the installation of the heat sink 2 into the base 6.

[0072] In this embodiment, terminal 3 and heat sink 2 each have two structural forms.

[0073] like Figure 5 As shown, the first type of terminal 3 includes a resistance-welded connection part 31 and a laser-welded connection part 32. The structures of the resistance-welded connection part 31 and the laser-welded connection part 32 are as described above. Terminal 3 does not require a connecting cable 5. The structure of this terminal 3 corresponds to... Figure 14 The first type of heat sink 2 shown has a structure including a welding part 21, a connecting part 23, a first heat sink 22, a second heat sink 24 and a third heat sink 25.

[0074] like Figure 9 As shown, the second type of terminal 3 includes a resistance-welded connection part 31, a laser-welded connection part 32, and a cable connection part 33, the structures of which are as described above. The structure of this terminal 3 corresponds to... Figure 13 The second type of heat sink 2 shown has a structure including a welding part 21, a connecting part 23, a first heat sink 22 and a second heat sink 24. The absence of a third heat sink 25 provides clearance for the cable connection part 33 to connect the cable 5.

[0075] There are three types of photovoltaic junction boxes: positive terminal junction box, intermediate terminal junction box, and negative terminal junction box.

[0076] like Figure 15 As shown, for the intermediate terminal box, the terminal box does not need to be equipped with cable 5. In order to improve the heat dissipation performance of the terminal box, the first type of terminal 3 and the first type of heat sink 2 mentioned above are installed inside the terminal box.

[0077] Figure 1 Exploded view of the positive terminal box. Figure 16 This is an exploded view of the negative terminal box. (Example:) Figure 1 and Figure 16 As shown, for the positive terminal box and the negative terminal box, the terminal box needs to be equipped with cable 5. One of the terminals 3 in the terminal box is the first type of terminal 3 mentioned above, and the heat sink 2 is the first type of heat sink 2. The other terminal 3 is the second type of terminal 3 mentioned above, and the heat sink 2 is the second type of heat sink 2.

[0078] In other embodiments, such as Figure 6 , Figure 17 and Figure 18 As shown, both the resistance-welded connection 31 and the laser-welded connection 32 are plate-shaped structures and are coplanar. The pins of diode 1 are welded to one side of the resistance-welded connection 31, and the busbar 4 is welded to the side of the laser-welded connection 32 away from the pins of diode 1. After the pins of diode 1 are welded to the resistance-welded connection 31, it is also convenient to weld the busbar 4 to the laser-welded connection 32, which facilitates assembly.

[0079] The structure of heat sink 2 in this embodiment is the same as that in the above embodiments, and will not be described again here. Figure 19 and Figure 20 As shown, the laser-welded connection part 32 and the resistance-welded connection part 31 are coplanar. When the diode 1 and terminal 3 are assembled with the heat sink 2, the pin of the diode 1 is placed between the resistance-welded connection part 31 and the welding part 21 of the heat sink 2. Specifically, the pin of the diode 1 is placed between the welding plate of the welding part 21 and the resistance-welded connection part 31.

[0080] Combination Figure 17 and Figure 20 As shown, terminal 3 also includes a cable connection part 33, which is connected to the laser welding connection part 32 and is disposed opposite to the resistance welding connection part 31. The cable connection part 33 is conductively connected to a cable 5. The cable 5 is used to connect to the external circuit of the photovoltaic junction box, thereby realizing the connection between the photovoltaic junction box and the external circuit. Please refer to the description in the above embodiment for the connection structure between the cable 5 and the base 6.

[0081] For terminal 3 with cable connection portion 33, cable connection portion 33 has a plate-like structure. One end of cable connection portion 33 is bent and connected to the other end of laser welding connection portion 32. Cable connection portion 33 is set higher than laser welding connection portion 32, and laser welding connection portion 32 and cable connection portion 33 form a step shape to facilitate welding of cable connection portion 33 to cable 5. To improve the reliability of the connection between cable 5 and cable connection portion 33, a protruding ridge is provided on the side of cable connection portion 33 where it connects to cable 5. Optionally, the width of cable connection portion 33 is smaller than that of laser welding connection portion 32 to reduce production costs, while ensuring a stable connection between cable 5 and cable connection portion 33. The width of laser welding connection portion 32 is equal to that of resistance welding connection portion 31 to ensure the reliability of the connection between bus 4 and laser welding connection portion 32, as well as the reliability of the connection between diode 1 pin and resistance welding connection portion 31.

[0082] The terminal 3, which is composed of resistance welded connection part 31 and laser welded connection part 32, or the terminal 3 composed of resistance welded connection part 31, laser welded connection part 32 and cable connection part 33, is an integrally formed structure and can be formed into a stepped shape by stamping process.

[0083] In this implementation, terminal 3 has two structural forms, such as Figure 6 As shown, the first type of terminal 3 includes a resistance-welded connection part 31 and a laser-welded connection part 32. The structures of the resistance-welded connection part 31 and the laser-welded connection part 32 are as described above. Terminal 3 does not require a connecting cable 5. The structure of this terminal 3 corresponds to... Figure 14The first type of heat sink 2 shown has a structure including a welding part 21, a connecting part 23, a first heat sink 22, a second heat sink 24 and a third heat sink 25.

[0084] like Figure 17 As shown, the second type of terminal 3 includes a resistance-welded connection part 31, a laser-welded connection part 32, and a cable connection part 33, the structures of which are as described above. The structure of this terminal 3 corresponds to... Figure 13 The second type of heat sink 2 shown has a structure including a welding part 21, a connecting part 23, a first heat sink 22 and a second heat sink 24. The absence of a third heat sink 25 provides clearance for the cable connection part 33 to connect the cable 5.

[0085] There are three types of photovoltaic junction boxes: positive terminal junction box, intermediate terminal junction box, and negative terminal junction box.

[0086] like Figure 21 As shown, for the intermediate terminal box, the terminal box does not need to be equipped with cable 5. In order to improve the heat dissipation performance of the terminal box, the first type of terminal 3 and the first type of heat sink 2 mentioned above are installed inside the terminal box.

[0087] like Figure 22 and Figure 23 As shown, for the positive terminal box and the negative terminal box, the terminal box needs to be equipped with cable 5. One of the terminals 3 in the terminal box is the first type of terminal 3 mentioned above, and the heat sink 2 is the first type of heat sink 2. The other terminal 3 is the second type of terminal 3 mentioned above, and the heat sink 2 is the second type of heat sink 2.

[0088] The heat sink 2 mentioned above is made of a thermally conductive material to improve heat dissipation efficiency. In this invention, the heat sink 2 only serves to dissipate heat and support the pins of diode 1, and does not conduct electricity. Therefore, the heat sink 2 can be made of copper, steel, aluminum, or other materials with good heat dissipation performance. Compared to copper, these materials are less expensive, thus reducing the production cost of the photovoltaic junction box. Terminal 3 enables the conductive connection between the pins of diode 1 and busbar 4, or the conductive connection between cable 5 and the pins of diode 1. Therefore, terminal 3 is made of copper. Since terminal 3 does not need to dissipate heat, its size can be smaller than that of terminals in the prior art. Heat dissipation is achieved through the heat sink 2, which can be made of steel or aluminum, which are less expensive than copper, thus reducing the production cost of the photovoltaic junction box.

[0089] The heat sink 2 is an integrally formed structure, which is usually formed by stamping process to form an integrally connected welded part 21, connecting part 23, first heat sink 22 and second heat sink 24, or to form an integrally connected welded part 21, connecting part 23, first heat sink 22, second heat sink 24 and third heat sink 25.

[0090] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A photovoltaic junction box, characterized in that, The device includes a diode (1) and a terminal (3). The terminal (3) includes a resistance-welded connection part (31) and a laser-welded connection part (32) connected to the resistance-welded connection part (31). The resistance-welded connection part (31) is welded to the pin of the diode (1) by resistance welding. The laser-welded connection part (32) is used to weld to the busbar (4) by laser welding. The laser-welded connection part (32) and the resistance-welded connection part (31) are not coplanar. The pin of the diode (1) and the busbar (4) are located on the same side of the terminal (3), or the laser-welded connection part (32) and the resistance-welded connection part (31) are coplanar. The pin of the diode (1) and the busbar (4) are located on opposite sides of the terminal (3).

2. The photovoltaic junction box according to claim 1, characterized in that, The resistance welding connection part (31) includes a connecting plate (311), the laser welding connection part (32) is a plate structure, one end of the connecting plate (311) is bent and connected to one end of the laser welding connection part (32), the pin of the diode (1) is welded to the side of the connecting plate (311) facing the laser welding connection part (32), and the busbar (4) is welded to the side of the laser welding connection part (32) away from the connecting plate (311).

3. The photovoltaic junction box according to claim 1, characterized in that, Both the resistance welding connection (31) and the laser welding connection (32) are plate-shaped structures and are arranged on the same plane. The pin of the diode (1) is welded to one side of the resistance welding connection (31), and the busbar (4) is welded to the side of the laser welding connection (32) away from the pin of the diode (1).

4. The photovoltaic junction box according to any one of claims 1 to 3, characterized in that, The terminal (3) further includes a cable connection part (33), which is connected to the laser welding connection part (32) and is disposed opposite to the resistance welding connection part (31). The cable connection part (33) is electrically connected to a cable (5).

5. The photovoltaic junction box according to claim 4, characterized in that, The cable connector (33) has a plate-like structure, and one end of the cable connector (33) is bent and connected to the laser welding connector (32); And / or, the side of the cable connector (33) that connects to the cable (5) is provided with a protruding ridge; And / or, the width of the cable connection portion (33) is smaller than that of the laser welding connection portion (32), and the width of the laser welding connection portion (32) is equal to that of the resistance welding connection portion (31).

6. The photovoltaic junction box according to claim 1, characterized in that, The photovoltaic junction box also includes a heat sink (2), which includes a welding part (21). When the laser welding connection part (32) and the resistance welding connection part (31) are not coplanar, the resistance welding connection part (31) is placed between the pin of the diode (1) and the welding part (21). When the laser welding connection part (32) and the resistance welding connection part (31) are coplanar, the pin of the diode (1) is placed between the resistance welding connection part (31) and the welding part (21).

7. The photovoltaic junction box according to claim 6, characterized in that, The welding part (21) includes a welding plate, and the surface of the welding plate is provided with a plurality of grooves (211) spaced apart. The pin of the diode (1) or the resistance welding connection part (31) is welded to the side surface of the welding plate provided with the grooves (211).

8. The photovoltaic junction box according to claim 6, characterized in that, The welding part (21) is provided with a first heat sink (22) on both sides opposite to each other, and the first heat sink (22) extends toward the side where the diode (1) is located.

9. The photovoltaic junction box according to claim 8, characterized in that, The heat sink (2) also includes a connecting part (23), one end of which is connected to one end of the welding part (21). The connecting part (23) has a second heat sink (24) on both sides opposite to it. The second heat sink (24) is set at an angle to the connecting part (23) and extends away from the connecting part (23). The laser welding connecting part (32) is placed between the two second heat sinks (24) and the second heat sink (24) is set higher than the laser welding connecting part (32).

10. The photovoltaic junction box according to claim 9, characterized in that, The photovoltaic junction box also includes a base (6), the heat sink (2) is disposed inside the base (6), and the connecting part (23) is attached to the bottom wall of the base (6); And / or, the projected area of ​​the connecting part (23) on the bottom wall of the base (6) is greater than the projected area of ​​the welding part (21) on the bottom wall of the base (6).

11. The photovoltaic junction box according to claim 9, characterized in that, The other end of the connecting part (23) is provided with a third heat sink (25). The third heat sink (25) is set at an angle to the connecting part (23), and the third heat sink (25) extends in a direction away from the connecting part (23). The third heat sink (25) is set higher than the laser welding connecting part (32).

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