Photovoltaic junction box

Abstract

The utility model belongs to the field of solar photovoltaic technology, and specifically discloses a photovoltaic junction box. According to the photovoltaic junction box provided by the utility model, the pin of the diode and one end of the terminal are welded with the welding part of the heat dissipation piece through electric resistance welding, and heat generated when the diode works can be transmitted to the heat dissipation piece through the pin of the diode and is dissipated through the heat dissipation piece, so that the heat dissipation efficiency when the diode works is improved; therefore, the heat dissipation performance of the photovoltaic junction box is improved, and the heat dissipation pieces also play a role in fixing and supporting the pins and the terminals of the diodes. One end of the terminal is conductively connected with the pin of the diode, the other end of the terminal is welded with the bus bar through laser welding, the terminal plays a role in middle transition connection, the terminal does not need to play a main role in heat dissipation, the size of the terminal can be relatively reduced, the structure of the terminal is simplified, the bus bar is connected with the terminal through laser welding, tin soldering is replaced, and the cost is reduced. And the tin welding cost is saved, so that the production cost is reduced.

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 pins, the diode with the soldered terminals is then placed inside the base, the busbar is soldered to the terminals, and finally, adhesive is poured into the base before the cover is fastened onto it. In existing PV junction boxes, the heat generated by the diodes during operation is dissipated through the terminals, resulting in low heat dissipation efficiency and consequently poor heat dissipation performance of the PV junction box. Utility Model Content

[0004] The purpose of this invention is to provide a photovoltaic junction box that improves the heat dissipation efficiency of the diode during operation, thereby enhancing the heat dissipation performance of the photovoltaic junction box.

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

[0006] A photovoltaic junction box, comprising:

[0007] diode;

[0008] terminal;

[0009] The heat sink includes a welding part, wherein the diode pins and one end of the terminal are both welded to the welding part by resistance welding, and the diode pins are electrically connected to the terminal, and the other end of the terminal is used to weld to the busbar by laser welding.

[0010] As an optional technical solution for the aforementioned photovoltaic junction box, the welding part includes a welding plate, the welding plate, the diode pins and the terminal are stacked, and the diode pins or the terminal are welded to one side surface of the welding plate.

[0011] As an optional technical solution for the aforementioned photovoltaic junction box, the welding plate has multiple grooves spaced apart on the side surface used for welding to the pins or terminals of the diode.

[0012] 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 away from the welding part and the pin welding surface of the diode.

[0013] As an optional technical solution for the aforementioned photovoltaic junction box, the heat sink further includes a connecting part, one end of which is connected to one end of the welding part. A second heat sink is provided on both opposite sides of the connecting part. The second heat sink is set at an angle to the connecting part and extends away from the connecting part. The other end of the terminal is placed between the two second heat sinks, and the second heat sink is set higher than the other end of the terminal.

[0014] 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;

[0015] 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.

[0016] 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 other end of the terminal.

[0017] As an optional technical solution for the aforementioned photovoltaic junction box, the terminal includes a resistance-welded connection part and a laser-welded connection part connected to the resistance-welded connection part. The resistance-welded connection part is welded to the welding part and electrically connected to the pin of the diode. The laser-welded connection part is used to weld to the busbar.

[0018] 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.

[0019] As an optional technical solution for the aforementioned photovoltaic junction box, the resistance welding connection part includes a plurality of spaced connection plates, one end of which is connected to the laser welding connection part, and the connection plate is placed between the welding part and the pin of the diode.

[0020] As an optional technical solution for the aforementioned photovoltaic junction box, the laser-welded connection part has a plate-like structure, one end of the connecting plate is bent and connected to one end of the laser-welded connection part, and one side surface of the laser-welded connection part is used to fit and weld with the busbar.

[0021] As an optional technical solution for the aforementioned photovoltaic junction box, both the resistance-welded connection part and the laser-welded connection part are plate-shaped structures, the resistance-welded connection part and the laser-welded connection part are coplanar, and the diode pins are placed between the resistance-welded connection part and the welded part.

[0022] The beneficial effects of this utility model are:

[0023] The photovoltaic junction box provided by this utility model has diode pins and terminals that are resistively welded to the heat sink. The heat generated by the diode during operation can be transferred to the heat sink through the diode pins and dissipated through the heat sink, improving the heat dissipation efficiency of the diode and thus enhancing the heat dissipation performance of the photovoltaic junction box. The heat sink also serves to fix and support the diode pins and terminals. One end of the terminal is electrically connected to the diode pin, while the other end is laser-welded to the busbar. The terminal acts as an intermediate transition connection, eliminating the need for primary heat dissipation and allowing for a relatively smaller terminal size and simplified structure. Furthermore, the busbar is laser-welded to the terminal, replacing soldering and saving solder costs, thereby reducing production costs. Additionally, the heat generated by the diode during operation can be conducted to the busbar and dissipated from the photovoltaic junction box, achieving efficient heat dissipation. Attached Figure Description

[0024] Figure 1 This is an exploded view of a positive-type photovoltaic junction box provided in an embodiment of this utility model;

[0025] Figure 2 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;

[0026] Figure 3 This is a schematic diagram of the internal structure of the base provided in this embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the base filled with insulating glue according to an embodiment of the present utility model;

[0028] Figure 5 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;

[0029] Figure 6 This is a schematic diagram of a heat dissipation component provided in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of another structure of the heat dissipation component provided in this embodiment of the utility model;

[0031] Figure 8 This is a schematic diagram of the first structure of the terminal provided in this embodiment of the present utility model;

[0032] Figure 9 This is a schematic diagram of the second structure of the terminal provided in this embodiment of the present invention;

[0033] Figure 10 This is a front view of the second structure of the terminal provided in this embodiment of the present invention;

[0034] Figure 11 This is a schematic diagram of the third structure of the terminal provided in this embodiment of the utility model;

[0035] Figure 12 This is a schematic diagram of the fourth structure of the terminal provided in this embodiment of the utility model;

[0036] Figure 13 This is a front view of the fourth structure of the terminal provided in this embodiment of the present utility model;

[0037] Figure 14 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;

[0038] Figure 15 This is a cross-sectional view of the internal structure of a base provided in an embodiment of this utility model;

[0039] Figure 16 This is an exploded view of a photovoltaic junction box of the intermediate electrode type provided in this embodiment of the present invention;

[0040] Figure 17 This is an exploded view of a negative-type photovoltaic junction box provided in an embodiment of this utility model;

[0041] Figure 18 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;

[0042] Figure 19 This is another structural schematic diagram of the connection between the heat sink, terminals, and diode provided in this embodiment of the utility model;

[0043] Figure 20 This is a cross-sectional view of another internal structure of the base provided in this embodiment of the utility model;

[0044] 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;

[0045] Figure 22 This is an exploded view of another type of positive electrode photovoltaic junction box provided in this embodiment of the utility model;

[0046] Figure 23 This is an exploded view of another type of negative electrode photovoltaic junction box provided in this embodiment of the utility model.

[0047] In the picture:

[0048] 1. Diode; 2. Heat sink; 3. Terminal; 4. Busbar; 5. Cable; 6. Base; 7. Cover; 8. Wire clamp; 9. Insulating adhesive;

[0049] 21. Welding part; 211. Groove; 22. First heat sink plate; 23. Connecting part; 24. Second heat sink plate; 25. Third heat sink plate;

[0050] 31. Resistance welded connection part; 311. Connecting plate; 32. Laser welded connection part; 33. Cable connection part. Detailed Implementation

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] like Figures 1 to 3 As shown, this embodiment provides a photovoltaic junction box, which includes a diode 1, a terminal 3, and a heat sink 2. The heat sink 2 includes a welding part 21. The pins of the diode 1 and one end of the terminal 3 are both welded to the welding part 21 by resistance welding, and the pins of the diode 1 are electrically connected to the terminal 3. The other end of the terminal 3 is used to weld to the busbar 4 by laser welding. The pins of diode 1 and one end of terminal 3 are both resistively welded to the welding part 21 of heat sink 2. The heat generated by diode 1 during operation can be transferred to heat sink 2 through the pins of diode 1 and dissipated through heat sink 2, improving the heat dissipation efficiency of diode 1 during operation and thus improving the heat dissipation performance of photovoltaic junction box. Heat sink 2 also serves to fix and support the pins of diode 1 and terminal 3. One end of terminal 3 is electrically connected to the pins of diode 1, while the other end of terminal 3 is welded to busbar 4 by laser welding. Terminal 3 serves as an intermediate transition connection and does not need to bear the main heat dissipation function, which can relatively reduce the size of terminal 3 and simplify its structure. In addition, busbar 4 is connected to terminal 3 by laser welding, replacing soldering, saving the cost of soldering and thus reducing production costs. Furthermore, the heat generated by diode 1 during operation can also be conducted to busbar 4 and dissipated from photovoltaic junction box by busbar 4, achieving efficient heat dissipation.

[0056] Diode 1 has two pins. Each pin of diode 1 is respectively provided with a heat sink 2, 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.

[0057] See Figure 3 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... Figures 1 to 3As 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 4 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 5 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] Combination Figure 2 and Figure 6 As shown, in order to improve the connection strength between the pin or terminal 3 of diode 1 and the soldering part 21, in some embodiments, the soldering part 21 includes a soldering plate, the soldering plate, the pin and terminal 3 of diode 1 are stacked, and the pin or terminal 3 of diode 1 is soldered to the side surface of the soldering plate with the groove 211, which increases the soldering area between the pin or terminal 3 of diode 1 and the soldering plate and improves the reliability of the connection between the pin or terminal 3 of diode 1 and the soldering part 21.

[0061] Alternatively, the side surface of the welding plate used for welding to the pins or terminals 3 of the diode 1 is provided with a plurality of grooves 211 at intervals. During resistance welding, the molten metal flows into the grooves 211, which further improves the connection strength between the pins or terminals 3 of the diode 1 and the welding part 21.

[0062] like Figure 6 and Figure 7As shown, a first heat sink 22 is provided on both opposite sides of the welding part 21. The first heat sink 22 extends away from the welding surface between the welding part 21 and the pin of the diode 1. The heat generated by the diode 1 during operation is transferred to the first heat sink 22 through the pin 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 22 is connected to the edge of the welding plate of the welding part 21, and the first heat sink 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 pin of the diode 1 and the welding plate. In addition, the first heat sink 22 also plays a shielding role. During the resistance welding process, the first heat sink 22 can block the molten metal from flowing to both sides, reduce the loss of molten metal, and ensure the effective welding area.

[0063] 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. The other end of the terminal 3 is positioned between the two second heat sinks 24, with the second heat sinks 24 positioned higher than the other end of the terminal 3. 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. Furthermore, heat can be dissipated to the outside through the connecting portion 23, the two second heat sinks 24, the insulating adhesive 9, and the side walls of the base 6, further improving the heat dissipation performance of the photovoltaic junction box. During laser welding of the busbar 4, the second heat sinks 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 9. The connecting part 23 can be a plate-like structure, with one end connected to one end of the welding plate. The area of ​​the connecting part 23 is larger than that of the welding plate to maximize the heat dissipation area. The second heat dissipation plate 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. The heat sink 2 is disposed within the base 6, and the connecting part 23 is in contact with the bottom wall of the base 6. The connecting part 23 serves as the main heat dissipation component of the heat sink 2, and is positioned close to the bottom wall of the base 6 to improve heat dissipation efficiency.

[0064] 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 function of heat dissipation.

[0065] Further optional, such as Figure 7As shown, a third heat sink 25 is provided at the other end of the connecting part 23. The third heat sink 25 is set at an angle to the connecting part 23 and extends away from the connecting part 23. The third heat sink 25 is set higher than the other end of the terminal 3. The heat generated by the diode 1 during operation can be dissipated to the outside through the connecting part 23, the third heat sink 25, the insulating glue 9, and the side wall 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 block the metal sparks from welding 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 glue 9 after the insulating glue 9 is potted inside the base 6. The third heat sink 25 can be connected to the edge of the connecting part 23. The third heat sink 25 is perpendicular to the connecting part 23 to facilitate the installation of the heat sink 2 into the base 6.

[0066] like Figures 8 to 13 As shown, in some embodiments, terminal 3 includes a resistance-welded connection portion 31 and a laser-welded connection portion 32 connected to the resistance-welded connection portion 31. The resistance-welded connection portion 31 is welded to the welding portion 21 and electrically connected to the pin of diode 1. The laser-welded connection portion 32 is welded to busbar 4. The resistance-welded connection portion 21 can be placed between the pin of diode 1 and the welding portion 21, or the pin of diode 1 can be placed between the resistance-welded connection portion 31 and the welding portion 21. This structure can reduce the distance between busbar 4 and diode 1, thereby improving the conductivity between busbar 4 and diode 1.

[0067] Further optional, such as Figure 9 , Figure 10 , Figure 12 and Figure 13 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.

[0068] See Figure 1 As shown, 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 side 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.

[0069] In one feasible approach, see [link to relevant documentation]. Figures 8 to 10As shown, the resistance welding connection 31 includes a plurality of spaced-apart connecting plates 311, one end of which is connected to the laser welding connection 32, as shown. Figure 14 and Figure 15 As shown, the connecting plate 311 is placed between the welding part 21 and the pin of the diode 1. Optionally, the connecting plate 311 can be inserted into the groove 211 of the welding plate. During resistance welding, the molten metal can fill the groove 211 and the space between the connecting plate 311 and the pin of the diode 1, improving the reliability of the connection between the welding plate, the connecting plate 311 and the pin of the diode 1.

[0070] 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.

[0071] like Figure 8 and Figure 9 As shown, the laser-welded connector 32 has a plate-like structure. One end of the connecting plate 311 is bent and connected to one end of the laser-welded connector 32. The busbar 4 is attached to and welded to one side surface of the laser-welded connector 32. The laser-welded connector 32 and the connecting plate 311 are not placed in the same plane to facilitate welding of the laser-welded connector 32 to the busbar 4. The pins of the diode 1 connected to the connecting plate 311 will not interfere with the busbar 4.

[0072] 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.

[0073] 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.

[0074] In this embodiment, terminal 3 has two structural forms, such as Figure 8As shown, the first type of terminal structure includes a resistance-welded connection portion 31 and a laser-welded connection portion 32. The structures of the resistance-welded connection portion 31 and the laser-welded connection portion 32 are as described above, and the terminal 3 does not require a connecting cable 5. The structure of this terminal corresponds to... Figure 7 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.

[0075] 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 6 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.

[0076] There are three types of photovoltaic junction boxes: positive terminal junction box, intermediate terminal junction box, and negative terminal junction box.

[0077] like Figure 16 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 provided inside the terminal box.

[0078] Figure 1 This is an exploded view of the positive terminal box. Figure 17 This is an exploded view of the negative terminal box, such as... Figure 1 and Figure 17 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.

[0079] In another feasible approach, such as Figure 11 , Figure 12 , Figure 18 , Figure 19 and Figure 20 As shown, both the resistance-welded connection part 31 and the laser-welded connection part 32 are plate-shaped structures. The resistance-welded connection part 31 and the laser-welded connection part 32 are coplanar, and the pin of diode 1 is placed between the resistance-welded connection part 31 and the welding part 21. After the pin of diode 1 is welded to the resistance-welded connection part 31, it is also convenient to weld the busbar 4 to the laser-welded connection part 32, which facilitates assembly.

[0080] like Figure 12As shown, 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.

[0081] 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.

[0082] In this implementation method, the terminal has two structural forms, such as Figure 11 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 7 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.

[0083] like Figure 12 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 6 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.

[0084] There are three types of photovoltaic junction boxes: positive terminal junction box, intermediate terminal junction box, and negative terminal junction box.

[0085] 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 provided inside the terminal box.

[0086] 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.

[0087] 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 materials less expensive than copper, such as steel or aluminum, thereby reducing the production cost of the photovoltaic junction box.

[0088] 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.

[0089] 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 by, include: Diode (1); terminal(3); Heat sink (2), the heat sink (2) includes a welding part (21), the pin of the diode (1) and one end of the terminal (3) are both welded to the welding part (21) by resistance welding, and the pin of the diode (1) is electrically connected to the terminal (3), and the other end of the terminal (3) is used to weld to the busbar (4) by laser welding.

2. The photovoltaic junction box of claim 1, wherein, The welding part (21) includes a welding plate, the welding plate, the pins of the diode (1) and the terminal (3) are stacked, and the pins of the diode (1) or the terminal (3) is welded to one side surface of the welding plate.

3. The photovoltaic junction box of claim 2, wherein, The welding plate has a plurality of grooves (211) spaced apart on one side surface for welding to the pins of the diode (1) or the terminal (3).

4. The photovoltaic junction box of claim 1, wherein, The welding part (21) is provided with a first heat sink (22) on both sides opposite to each other. The first heat sink (22) extends toward the side away from the welding surface of the welding part (21) and the pin welding surface of the diode (1).

5. The photovoltaic junction box of claim 4, wherein, 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 each other. The second heat sink (24) is set at an angle to the connecting part (23) and extends away from the connecting part (23). The other end of the terminal (3) is placed between the two second heat sinks (24) and the second heat sink (24) is set higher than the other end of the terminal (3).

6. The photovoltaic junction box of claim 5, wherein, 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).

7. The photovoltaic junction box of claim 5, wherein, 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 other end of the terminal (3).

8. The photovoltaic junction box of claim 1, wherein, 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 welding part (21) and electrically connected to the pin of the diode (1). The laser welded connection part (32) is used to weld to the busbar (4).

9. The photovoltaic junction box of claim 8, wherein, 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).

10. Photovoltaic junction box according to claim 8 or 9, characterized in that The resistance welding connection part (31) includes a plurality of spaced connection plates (311), one end of the connection plate (311) is connected to the laser welding connection part (32), and the connection plate (311) is placed between the welding part (21) and the pin of the diode (1).

11. The photovoltaic junction box of claim 10, wherein, The laser welding connection part (32) is a plate-shaped structure. One end of the connecting plate (311) is bent and connected to one end of the laser welding connection part (32). One side surface of the laser welding connection part (32) is used to fit and weld with the busbar (4).

12. A photovoltaic junction box according to claim 8 or 9, characterized in that Both the resistance welding connection part (31) and the laser welding connection part (32) are plate-shaped structures. The resistance welding connection part (31) and the laser welding connection part (32) are coplanar. The pin of the diode (1) is placed between the resistance welding connection part (31) and the welding part (21).

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