Photovoltaic junction box welding base, photovoltaic junction box and photovoltaic module

Abstract

The utility model relates to a photovoltaic junction box welding base, a photovoltaic junction box and a photovoltaic assembly, the photovoltaic junction box welding base comprises a welding plate, the welding plate is provided with a welding surface, the welding surface is provided with a tin storage part, the tin storage part is used for accommodating soldering tin, and the welding surface is suitable for welding a drainage strip; a lead-out hole is formed in the welding plate, the lead-out hole is used for allowing the drainage strip to penetrate through, the welding surface comprises an inclined arrangement area, the height of one end, close to the lead-out hole, of the inclined arrangement area is lower than that of the other end, away from the lead-out hole, of the inclined arrangement area, and the soldering tin can be contained in the tin storage part; and soldering tin contained in the tin storage part can enable the two parts to be firmly welded. As the height of one end of the lead-out hole is lower than the height of the other end opposite to the lead-out hole, the soldering tin flows to a low position due to gravity, so that the soldering tin at the root position of the drainage strip is more, the welding reliability at the position is enhanced, and the welding stability of the whole photovoltaic junction box is further improved.

Description

Technical Field

[0001] This disclosure relates to the technical field of junction boxes, specifically to a photovoltaic junction box welding base, a photovoltaic junction box, and a photovoltaic module. Background Technology

[0002] During the soldering of existing photovoltaic junction boxes, the high fluidity of molten solder may cause it to flow beyond the contact point between the current guide and the solder base, failing to completely fill the solder gap. This results in an unreliable solder joint and a cold solder joint. Because the current guide is bent and adhered to the solder base, the pressure applied by the soldering head during welding forces it into contact with the base. After the pressure is released upon completion of welding, the current guide tends to spring back. If this springback occurs before the molten solder has fully solidified, affecting the contact between the current guide and the molten solder, it can lead to increased contact resistance or even a loose, cold solder joint. Utility Model Content

[0003] The purpose of this disclosure is to provide a photovoltaic junction box welding base, a photovoltaic junction box, and a photovoltaic module, so as to at least partially solve the technical problems existing in the related art.

[0004] To achieve the above objectives, this application provides a photovoltaic junction box welding base, including a welding plate;

[0005] The welding plate has a welding surface, and a solder reservoir is provided on the welding surface for accommodating solder. The welding surface is suitable for welding a drain strip.

[0006] The welding plate is provided with lead-out holes for the drainage strip to pass through;

[0007] The welding surface includes an inclined arrangement area, wherein the height of the inclined arrangement area near the lead-out hole is lower than the height of the inclined arrangement area away from the lead-out hole at the other end.

[0008] Optionally, multiple tin storage sections are provided, and the multiple tin storage sections are spaced apart along the inclined direction of the inclined arrangement area.

[0009] Optionally, the tin storage section extends in a direction that intersects the inclined direction of the inclined arrangement area.

[0010] Optionally, the tin storage section is configured as a straight line, or the tin storage section includes at least two segments arranged at an angle, or the tin storage section is configured as a wave.

[0011] Optionally, the welding surface portion is recessed to form a groove, and the groove is the tin storage portion.

[0012] Optionally, the welding surface portion has raised ridges, and the tin storage portion is the gap between two adjacent raised ridges.

[0013] Optionally, the base further includes a bending plate, wherein the first side of the welding plate is connected to the second side of the bending plate to form a connecting edge, and the bending plate and the welding surface form an angle;

[0014] The drainage strip is welded to the welding plate;

[0015] The lead-out hole is located between the tin storage portion and the connecting edge.

[0016] Optionally, a first connecting plate is provided on the third side of the welding plate, and the first connecting plate is provided with a connecting hole, which is adapted to be connected to the outer shell;

[0017] The third side is positioned opposite to the first side.

[0018] Optionally, a second connecting plate is provided on the fourth side of the bent plate, and the second connecting plate is adapted to be connected to the diode;

[0019] The fourth side is positioned opposite to the second side.

[0020] According to a second aspect of this disclosure, a photovoltaic junction box is provided, including a diode, a housing, and two of the aforementioned bases;

[0021] The two bases are electrically connected to the two poles of the diode and are connected to the housing.

[0022] According to a third aspect of this disclosure, a photovoltaic module is provided, including the aforementioned photovoltaic junction box, wherein the positive and negative terminal lead bars of the battery string are bent and pass through the lead holes of two bases respectively, and are electrically connected to the bases.

[0023] The above technical solution designs a solder reservoir to hold solder, ensuring that the solder can be contained within it. When soldering with the current-carrying strip, at least some solder in the reservoir can be used to weld both, resulting in a strong weld. The height of the inclined area of ​​the welding surface near the outlet hole is lower than the height of the inclined area away from the outlet hole. Partially molten solder flows to the lower position due to gravity, resulting in more solder at the root of the current-carrying strip, enhancing the reliability of the weld at that location and thus improving the overall welding stability of the photovoltaic junction box. Furthermore, because the welding surface includes the inclined area, it reduces the distance between the end of the bent portion of the current-carrying strip away from the outlet hole and the welding surface, which is also beneficial to the welding reliability of the bent portion's end.

[0024] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a top view schematic diagram of a photovoltaic junction box provided in an exemplary embodiment of this disclosure;

[0027] Figure 2 This is a perspective view of a photovoltaic junction box welding base provided in an exemplary embodiment of the present disclosure, wherein the tin storage portion is the gap between adjacent protrusions;

[0028] Figure 3 This is a perspective view of a photovoltaic junction box welding base provided in another exemplary embodiment of the present disclosure, wherein the tin storage portion is the gap between adjacent protrusions;

[0029] Figure 4 This is a perspective view of a photovoltaic junction box welding base provided in an exemplary embodiment of the present disclosure, wherein the tin storage part is a groove;

[0030] Figure 5 This is a perspective view of a photovoltaic junction box welding base provided in an exemplary embodiment of the present disclosure, showing a drain strip.

[0031] Explanation of reference numerals in the attached figures

[0032] 100. Photovoltaic junction box; 1. Base; 10. Welding plate; 11. Welding surface; 111. First side; 112. Third side; 12. Solder storage section; 13. Groove; 14. Protrusion; 15. Lead-out hole; 16. First connecting plate; 161. Connecting hole; 17. Second connecting plate; 20. Bending plate; 21. Second side; 22. Fourth side; 30. Connecting ridge; 40. Current-draining strip; 50. Diode; 60. Housing. Detailed Implementation

[0033] The specific embodiments of this disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0034] In the description of this disclosure, it should be understood that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the drawing orientation shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational construction and operation, and therefore should not be construed as a limitation of this disclosure.

[0035] In this disclosure, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not indicate sequence or importance. Furthermore, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same elements.

[0036] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connect," "link," and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0037] This application provides a photovoltaic junction box welding base, such as Figures 1 to 5 As shown, the device includes a soldering plate 10, which has a soldering surface 11 and a solder reservoir 12 for accommodating solder. The soldering surface 11 is suitable for soldering a guide bar 40. The soldering plate 10 has an outlet hole 15 for the guide bar 40 to pass through. The soldering surface 11 includes an inclined arrangement area, and the height of the inclined arrangement area near the outlet hole 15 is lower than the height of the inclined arrangement area away from the outlet hole 15.

[0038] Through the above technical solution, the solder storage section 12 is designed to accommodate solder, so that the solder can be contained within the solder storage section 12. When welding the welding plate 10 and the lead strip 40 to be welded, at least the solder contained in the solder storage section 12 can weld the two, making the weld between the two reliable. The height of the inclined arrangement area of ​​the welding surface 11 near the lead hole 15 is lower than the height of the inclined arrangement area away from the lead hole 15. Partially molten solder flows to the lower position due to gravity, resulting in more solder at the root of the lead strip 40, which enhances the reliability of the weld at that location, thereby improving the welding stability of the entire photovoltaic junction box 100. In addition, since the welding surface 11 includes the inclined arrangement area, it reduces the distance between the end of the bent portion of the lead strip 40 away from the lead hole 15 and the welding surface 11, which is also beneficial to the welding reliability of the end of the bent portion.

[0039] The soldering plate 10 is installed at an angle on the housing 60 of the junction box 100 (hereinafter referred to as the junction box 100), and the lead-out hole 15 is close to the lower angle of the soldering plate 10. The lower angle refers to the lower position of the soldering plate 10 in the height direction. Since the solder can flow to the lower position of the soldering plate 10 in the height direction by gravity, it is convenient to solder the lead-out hole 15.

[0040] In this disclosure, the welding plate 10 is used for welding with the guide strip 40. Since the welding plate 10 and the guide strip 40 are connected in a plane, there is less solder between them, which may lead to unstable welding. Therefore, a solder reservoir 12 is provided on the welding plate 10. The solder reservoir 12 can hold solder, which can ensure that there is solder between the welding strip and the guide strip 40. The solder in the solder reservoir 12 can connect the welding plate 10 and the guide strip 40 to ensure the stability of the connection between the guide strip 40 and the welding plate 10.

[0041] The current-guiding strip 40 is an important component inside the photovoltaic panel, and its function is to collect the current generated by the solar cells and guide it to the junction box 100. The solar panel consists of multiple solar cells connected in series, and the current generated by these cells needs to be effectively collected. To achieve this, current-guiding strips 40 made of metal conductors are typically used on the front and back of the solar cells to collect the current. The base 1 of this disclosure is made of a metallic conductive material, such as copper or a copper alloy.

[0042] Because the welding plate 10 is tilted, when the solder flows on the tilted welding surface 11, it will automatically flow downwards, that is, towards the lower tilted end of the welding plate 10. This ensures that there is more solder near the edge of the welding plate 10 and between it and the guide strip 40, preventing instability in the welding between the guide strip 40 and the welding plate 10 due to the springback property of the metal after the welding pressure is removed. The solder can be pre-placed on the welding base 1 by the junction box manufacturer, or additional solder can be added during the junction box welding process.

[0043] In this disclosure, such as Figures 1 to 4 As shown, multiple solder reservoirs 12 can be provided, and these multiple solder reservoirs 12 are spaced apart in a direction intersecting the inclined direction of the inclined arrangement area. Providing multiple solder reservoirs 12 can disperse the solder between the soldering plate 10 and the guide bar 40, thereby improving the reliability of the connection between the soldering plate 10 and the guide bar 40. Furthermore, the spaced arrangement of multiple solder reservoirs 12 in the inclined direction of the inclined arrangement area can prevent excessive solder accumulation at lower levels, thus avoiding solder shortages in other areas.

[0044] Optionally, multiple solder reservoirs 12 are distributed at equal intervals. The parallel arrangement of multiple solder reservoirs 12 at equal intervals can ensure that the force on the guide bar 40 when soldered to the soldering plate 10 is uniform, ensuring that the connection between the guide bar 40 and the soldering plate 10 is uniformly stressed, which is beneficial to improving the reliability of the connection between the soldering plate 10 and the guide bar 40.

[0045] In this disclosure, the shape of the solder reservoir 12 is not limited, as long as it can accommodate solder.

[0046] For example, Figure 2 and Figure 4 As shown, in this disclosure, the solder reservoir 12 can be configured as a straight strip extending in a direction intersecting the inclined direction of the inclined arrangement region. Correspondingly, the lead-out hole 15 can be configured as a strip, and the solder reservoir 12 can extend along the length direction of the lead-out hole 15. Thus, in the inclined arrangement region, the extending direction of the solder reservoir 12 and the inclined direction of the soldering plate 10 are different, which can reduce the flow of solder in the solder reservoir 12 along the inclined direction of the soldering plate 10, increase the amount of solder remaining on the solder reservoir 12, and thereby strengthen the connection between the soldering plate 10 and the lead-out strip 40.

[0047] Alternatively, for example, Figure 3 As shown, the solder reservoir 12 can be configured as a strip, comprising at least two segments arranged at an angle. By configuring the solder reservoir 12 as two strip segments arranged at an angle, when other structures are identical, this configuration increases the solder reservoir area and volume of the solder reservoir 12, thereby increasing the amount of solder stored and enhancing the stability of the connection between the soldering plate 10 and the guide strip 40. Figure 3 The solder storage section 12 is set in a V-shape, with the bend of the solder storage section 12 facing the lead-out hole 15, which facilitates the storage of solder.

[0048] In some embodiments of this disclosure, the tin storage portion 12 may also be configured with a suitable shape such as a corrugated shape.

[0049] For example, Figure 3 As shown, in this disclosure, the soldering surface 11 can be recessed to form a groove 13, which serves as a solder reservoir 12. This design ensures the stability of the solder reservoir amount in the solder reservoir 12.

[0050] For example, Figure 2 and Figure 3 As shown, in this disclosure, the soldering surface 11 can be convex to form ridges 14, and the solder storage portion 12 is the gap between two adjacent ridges 14. This arrangement facilitates solder flow and also allows for solder storage. The gaps between the ridges 14 can store solder, increasing the contact area between the base 1, the solder, and the guide bar 40, reducing contact resistance, and increasing soldering pull force.

[0051] In this disclosure, such as Figure 5As shown, the base 1 also includes a bending plate 20. The first side 111 of the welding plate 10 is connected to the second side 21 of the bending plate 20 to form a connecting ridge 30, and the bending plate 20 and the welding surface 11 form an angle. The guide strip 40 is partially welded to the welding plate 10, and the lead-out hole 15 is provided between the solder storage part 12 and the connecting ridge 30. Since part of the guide strip 40 is connected to the welding plate 10 and part of it passes through the lead-out hole 15 on the welding plate 10, there is a bent part of the guide strip 40 at the position of the lead-out hole 15. Due to the elastic nature of metal, the guide strip 40 may spring back after the welding pressure is removed, causing the bent part of the guide strip 40 to loosen from the weld on the welding plate 10. Therefore, by setting the lead hole 15 between the solder storage part 12 and the connecting edge 30, since the solder on the inclined soldering plate 10 will flow towards the angle, there will be a large amount of solder between the solder storage part 12 and the connecting edge 30. The welding of a large amount of solder makes the drain strip 40 have good welding pull when it rebounds, which can ensure the welding between the soldering plate 10 and the drain strip 40.

[0052] The welding surface of the base 1 is machined into an inclined shape, which allows the solder directional guide strip 40 to flow at the root of the bend, filling the gap between the bend and the welding plate 10, thereby avoiding the gap between the two being too large and causing poor soldering.

[0053] The connecting edge 30 refers to the edge formed at the connection point between the bent plate 20 and the welding plate 10.

[0054] In this disclosure, such as Figure 1 As shown, a first connecting plate 16 can be provided on the third side 112 of the welding plate 10. The first connecting plate 16 is provided with a connecting hole 161, which is suitable for connecting with the outer shell 60. The third side 112 and the first side 111 are arranged opposite to each other. This arrangement facilitates the connection between the welding plate 10 and the outer shell 60.

[0055] In this disclosure, such as Figure 1 As shown, a second connecting plate 17 is provided on the fourth side 22 of the bent plate 20. The second connecting plate 17 is adapted to connect with the diode 50, wherein the fourth side 22 and the second side 21 are arranged opposite to each other. This arrangement facilitates the connection between the welding plate 10 and the diode 50.

[0056] According to a second aspect of this disclosure, a photovoltaic junction box 100 is provided, including a diode 50, a housing 60, and two bases 1. A current-leading strip 40 can be soldered to a soldering plate 10 and to a soldering surface 11. The two bases 1 are respectively soldered to the diode 50 and connected to the housing 60. The photovoltaic junction box 100 is located on the back of the photovoltaic panel, and its main function is to connect the current generated by the solar panel and transmit it to an external circuit. The junction box 100 typically includes protective devices, such as the diode 50, to protect the solar panel from hot spot effects.

[0057] According to a third aspect of this disclosure, a photovoltaic module is provided, including the photovoltaic junction box 100 described above, wherein the positive and negative terminal lead bars of the battery string are bent and pass through the lead-out holes 15 of two bases 1 respectively, and are electrically connected to the bases 1.

[0058] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0059] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction, and this disclosure will not describe the various possible combinations separately.

[0060] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A photovoltaic junction box welding base, characterized in that, Including welding plates; The welding plate has a welding surface, and a solder reservoir is provided on the welding surface for accommodating solder. The welding surface is suitable for welding a drain strip. The welding plate is provided with lead-out holes for the drainage strip to pass through; The welding surface includes an inclined arrangement area, wherein the height of the inclined arrangement area near the lead-out hole is lower than the height of the inclined arrangement area away from the lead-out hole at the other end.

2. The photovoltaic junction box welding base according to claim 1, characterized in that, Multiple tin storage sections are provided, and the multiple tin storage sections are spaced apart along the inclined direction of the inclined arrangement area.

3. The photovoltaic junction box welding base according to claim 2, characterized in that, The tin storage portion extends in a direction that intersects the inclined direction of the inclined arrangement area.

4. The photovoltaic junction box welding base according to claim 3, characterized in that, The tin storage section is configured as a straight line, or the tin storage section includes at least two segments arranged at an angle, or the tin storage section is configured as a corrugated shape.

5. The photovoltaic junction box welding base according to any one of claims 1-4, characterized in that, The welding surface is recessed to form a groove, which is the tin storage part.

6. The photovoltaic junction box welding base according to any one of claims 1-4, characterized in that, The welding surface portion has a raised ridge, and the tin storage portion is the gap between two adjacent raised ridges.

7. The photovoltaic junction box welding base according to any one of claims 1-4, characterized in that, The base also includes a bent plate, the first side of the welding plate is connected to the second side of the bent plate to form a connecting edge, and an angle is formed between the bent plate and the welding surface; The drainage strip is welded to the welding plate; The lead-out hole is located between the tin storage portion and the connecting edge.

8. The photovoltaic junction box welding base according to claim 7, characterized in that, A first connecting plate is provided on the third side of the welding plate, and a connecting hole is provided on the first connecting plate, which is suitable for connection with the outer shell; The third side is positioned opposite to the first side.

9. The photovoltaic junction box welding base according to claim 7, characterized in that, A second connecting plate is provided on the fourth side of the bent plate, and the second connecting plate is adapted to be connected to the diode. The fourth side is positioned opposite to the second side.

10. A photovoltaic junction box, characterized in that, Includes a diode, a housing, and a base as described in any one of claims 1-9; The two bases are electrically connected to the two poles of the diode and are connected to the housing.

11. A photovoltaic module, characterized in that, Includes the photovoltaic junction box as described in claim 10.

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