Module diode of solar cell junction box

Abstract

The present invention proposes a module diode of a solar cell junction box, which specifically includes a positive terminal, a negative terminal, a diode chip and a package body; the two ends of the positive terminal and the negative terminal are respectively a wiring terminal and a chip terminal, the positive terminal of the diode chip is connected and fixed to the chip terminal of the positive terminal, and the negative terminal is connected to the chip terminal of the negative terminal through a jumper, and the chip terminal of the positive terminal, the chip terminal of the negative terminal and the diode chip are all packaged in the package body; the wiring ends of the positive terminal and the negative terminal are provided with a bus bar through hole for a bus bar to pass through; the wiring ends of the positive terminal and the negative terminal are both provided with a wiring portion for connecting to a cable and a welding portion for welding to a bus bar, the welding portion is located beside the bus bar through hole, one end of the welding portion is integrally connected to the wiring terminal, and the other end is in a tilted state; the side of the wiring terminal is also provided with a flange, and at least part of the flange extends to the side of the bus bar through hole.

Description

Technical Field

[0001] The invention belongs to the technical field of solar energy utilization, and in particular relates to a module diode of a solar cell junction box. Background Art

[0002] The utility model patent with patent application number 201920813832.3 discloses a module of a solar cell junction box, including a package, a positive terminal, a negative terminal, and a diode chip. The right end of the positive terminal is provided with a positive wiring nose, the left part is provided with a right strip hole, and the left end of the negative terminal is provided with a negative wiring nose, and the right part is provided with a left strip hole; the diode chip is welded and fixed on the positive terminal and is located to the left of the right strip hole, one pole of the diode chip is electrically connected to the positive terminal, and the other pole is connected to the negative terminal through a jumper; the package includes a bottom box and an upper cover, the bottom box and the upper cover are both in the shape of an "I" so that the right side of the bottom box and the upper cover have a right notch area, and the left side has a left notch area; and the left part of the positive terminal, the right part of the negative terminal, and the diode chip are all encapsulated in the package, and the right strip hole is located in the right notch area, and the left strip hole is located in the left notch area. The advantages are: small size, low cost, and good quality.

[0003] When the module diode in the above patent is welded to the bus bar of the solar cell, since the welding position is at a horizontal position at the terminal, it is impossible to clamp and weld this place with the bus bar using two electrodes of resistance welding. Therefore, the bus bar can only be welded to the terminal by using ferrochrome plus tin wire. Not only is the welding efficiency low, but it is also difficult to ensure the quality of the welding, and there is a high risk of failure such as cold soldering and empty soldering. Summary of the invention

[0004] The object of the present invention is to provide a module diode for a solar cell junction box, which has high structural strength and can be conveniently welded with a bus bar.

[0005] The module diode of the solar cell junction box of the present invention comprises a positive terminal, a negative terminal, a diode chip and a package body; the two ends of the positive terminal and the negative terminal are respectively a wiring terminal and a chip terminal, the positive terminal of the diode chip is connected and fixed to the chip end of the positive terminal, and the negative terminal is connected to the chip end of the negative terminal through a jumper, and the chip end of the positive terminal, the chip end of the negative terminal and the diode chip are all packaged in the package body; the wiring ends of the positive terminal and the negative terminal are provided with a bus bar through hole for the bus bar to pass through; the key point is that the wiring ends of the positive terminal and the negative terminal are both provided with a wiring part for connecting to a cable and a welding part for welding to a bus bar, the welding part is located beside the bus bar through hole, one end of the welding part is integrally connected to the wiring terminal, and the other end is in a tilted state; the side of the wiring terminal is also provided with a flange, and at least part of the flange extends to the side of the bus bar through hole.

[0006] Since one end of the welding part is in a tilted state and is not on the plane where the module diode is located, when the welding part is welded to the busbar, the busbar can be passed through the busbar through-hole and close to the welding part, and then the welding part and the busbar are clamped by two electrodes of resistance welding. After the two electrodes of resistance welding are energized, the current flows through the welding part and the busbar, and the resistance heat effect generated heats the welding part and the busbar to form a metal bond. Compared with the traditional welding method of chromium iron plus tin wire, welding the welding part and the busbar by resistance welding has the advantages of high efficiency and good welding effect. The above-mentioned flanging increases the heat dissipation area without changing the overall projection area of ​​the module diode, and can quickly disperse the heat when welding the busbar, avoiding the concentration of heat at the diode chip and excessive temperature, and is also conducive to improving the structural strength at the busbar through-hole.

[0007] Furthermore, the welding portion and the flange are perpendicular to the wiring portion, and the extension direction of the welding portion is opposite to that of the flange. In this way, during welding, the movement control of the two electrodes of the resistance welding is simpler, and only horizontal and vertical movements are required, without adjusting the angles of the two electrodes. Therefore, welding is more convenient, and the flange will not hinder the welding operation.

[0008] Furthermore, the flange and the welding portion are perpendicular to each other, so as to improve the overall structural strength of the module diode.

[0009] Furthermore, the busbar through hole and the welding part are located between the chip end and the wiring part of the terminal, so that the busbar will not interfere with the cable, which facilitates the connection of the cable.

[0010] Furthermore, the welding part is formed by cutting the terminal and tilting the free end of the plate structure formed by the cutting, the cutting position forms the busbar through hole, and the flange is formed by bending the side of the terminal. The busbar through hole and the welding part are formed by cutting and bending a part of the terminal simultaneously, and the flange can be formed by bending the two sides of the terminal directly using relevant equipment, so that the welding part and the flange are both formed on the plate of the terminal, and the connection with the terminal is very reliable, and the production is convenient and the cost is low.

[0011] Furthermore, the two sides of the package body extend to the two sides of the bus bar through hole of the corresponding terminal, so that the package body forms an "I"-shaped structure, so that the connection area between the package body and the chip end covers the bus bar through hole end and the chip end area, which can increase the strength of the material bridge at the bus bar through hole end and avoid deformation and stress damage to the diode chip during production and processing.

[0012] Furthermore, foolproof through holes with different diameters are provided on both sides of the positive terminal and / or negative terminal, which can match with positioning posts of corresponding sizes on the junction box base to prevent the positive and negative poles of the module diode from being installed in reverse.

[0013] Furthermore, the wiring portion is a planar structure or a U-shaped rivet cup structure, so as to facilitate resistance welding or mechanical riveting of the cable conductor and the terminal.

[0014] The module diode of the solar cell junction box of the present invention has the advantages of small product, high structural strength, low cost, good electrical performance, high reliability, etc., and is also convenient to be welded with the bus bar of the solar cell using resistance welding equipment, which can eliminate the cost of existing solder, flux, etc., and reduces the risk of failure of existing cold welding, empty welding, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the internal structure of the module diode of Example 1 (from a top view, with the package body made transparent).

[0016] Figure 2 1 is a top view of the module diode of Example 1.

[0017] Figure 3 yes Figure 2 AA section view.

[0018] Figure 4 yes Figure 3 BB cross-sectional view.

[0019] Figure 5 It is a schematic diagram of the three-dimensional structure of the module diode of Example 1.

[0020] Figure 6It is a schematic diagram of the welding principle of the module diode and the bus bar of Example 1 (the connection part is a planar structure).

[0021] Figure 7 It is a schematic diagram of the welding principle of the module diode and the bus bar of Example 1 (the connection portion is a U-shaped rivet cup structure).

[0022] The attached figure indicates: 1. positive terminal; 2. negative terminal; 3. diode chip; 4. package body; 5. jumper; 6. wiring part; 7. welding part; 8. busbar through hole; 9. foolproof through hole; 10. busbar; 11. flange. DETAILED DESCRIPTION

[0023] The following is a detailed description of the specific implementation of the present invention, such as the shape, structure, relative position and connection relationship of each component involved, the function and working principle of each component, etc., through the description of the implementation examples with reference to the accompanying drawings.

[0024] Embodiment 1:

[0025] This embodiment provides a module diode of a solar cell junction box, and the module diode can be conveniently welded to a bus bar.

[0026] like Figures 1 to 5 As shown, the module diode of the solar cell junction box of this embodiment includes a positive terminal 1, a negative terminal 2, a diode chip 3 and a package body 4; the two ends of the positive terminal 1 and the negative terminal 2 are respectively a wiring terminal and a chip end, the positive end of the diode chip 3 is connected and fixed to the chip end of the positive terminal 1, and the negative end is connected to the chip end of the negative terminal 2 through a jumper 5, and the chip end of the positive terminal 1, the chip end of the negative terminal 2 and the diode chip 3 are all encapsulated in the package body 4.

[0027] The connection ends of the positive terminal 1 and the negative terminal 2 are both provided with a connection portion 6 for connecting to a cable and a welding portion 7 for welding to a bus bar, and a bus bar through hole 8 for the bus bar to pass through is provided between the chip end and the connection portion 6; the connection portion 6 in this embodiment is a planar structure to facilitate welding of the cable conductor and the terminal resistor; of course, the connection portion 6 can also be a U-shaped rivet cup structure to facilitate mechanical riveting of the cable conductor and the terminal resistor (such as Figure 7 As shown); the welding portion 7 is located beside the busbar through hole 8, one end of the welding portion 7 is integrally connected to the terminal, and the other end is in a tilted state. In this embodiment, the welding portion 7 is formed by cutting the terminal and tilting the free end of the plate structure formed by the cutting, and the cutting position forms the busbar through hole 8. The above-mentioned busbar through hole 8 and welding portion 7 are formed simultaneously by cutting and bending a part of the terminal, which is convenient to produce and low in cost.

[0028] The two sides of the package body 4 extend to the two sides of the bus bar through hole 8 of the corresponding terminal, so that the package body 4 forms an "I"-shaped structure. In this way, the connection area between the package body 4 and the chip end covers the end of the bus bar through hole 8 and the chip end area, which can increase the strength of the material bridge at the end of the bus bar through hole 8 and avoid deformation and stress damage to the diode chip 3 during production and processing.

[0029] Both sides of the connection terminals of the positive terminal 1 and the negative terminal 2 are formed with flanges 11 by bending, and the flanges 11 extend from the connection portion 6 to the side of the busbar through hole 8. The flanges 11 increase the heat dissipation area without changing the overall projection area of ​​the module diode, and can quickly disperse heat when welding the busbar, avoiding heat concentration at the diode chip 3 and excessive temperature, and are also beneficial to improving the structural strength at the busbar through hole 8. The flanges 11 are perpendicular to the connection terminals, and the extension direction is opposite to the extension direction of the welding portion 7, so that no obstruction will be formed when welding the busbar. In this embodiment, the flanges 11 and the welding portion 7 are perpendicular to each other to improve the overall structural strength of the module diode.

[0030] Both sides of the positive terminal 1 and the negative terminal 2 are provided with foolproof through holes 9 of different diameters, which match the positioning columns of corresponding sizes on the junction box base to prevent the positive and negative poles of the module diode from being installed in reverse.

[0031] like Figure 6 As shown, since one end of the welding part 7 is in a tilted state and not on the plane where the module diode is located, when the welding part 7 is welded with the bus bar 10, the bus bar 10 can be passed through the bus bar through hole 8 and close to the welding part 7, and then the welding part 7 and the bus bar 10 are clamped by two electrodes of resistance welding. After the two electrodes of resistance welding are energized, the current flows through the welding part 7 and the bus bar 10, and the resistance heat effect generated heats the welding part 7 and the bus bar 10 and forms a metal bond. Compared with the traditional chromium iron plus tin wire welding method, welding the welding part 7 and the bus bar 10 by resistance welding has the advantages of high efficiency and good welding effect.

[0032] In this embodiment, the welding portion 7 is perpendicular to the wiring portion 6, so that during welding, the movement control of the two electrodes of the resistance welding is simpler, and only horizontal and vertical movements are required, and there is no need to adjust the angles of the two electrodes, so welding is more convenient.

[0033] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific design of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A module diode of a solar cell junction box, comprising a positive terminal, a negative terminal, a diode chip and a package; both ends of the positive terminal and the negative terminal are a wiring terminal and a chip terminal respectively, the positive terminal of the diode chip is connected and fixed to the chip terminal of the positive terminal, the negative terminal is connected to the chip terminal of the negative terminal through a jumper, the chip terminal of the positive terminal, the chip terminal of the negative terminal and the diode chip are all packaged in the package; the wiring ends of the positive terminal and the negative terminal are provided with busbar through holes for busbars to pass through; characterized in that, The connection terminals of the positive terminal and the negative terminal are both provided with a connection portion for connecting to a cable and a welding portion for welding to a busbar, the welding portion is located beside the busbar through-hole, one end of the welding portion is integrally connected to the connection terminal, and the other end is in a tilted state; the welding portion is formed by making an incision on the connection terminal and tilting the free end of the strip structure formed by the incision, and the position of the incision forms the busbar through-hole; the side of the connection terminal is also provided with a flange, and the flange at least partially extends to the side of the busbar through-hole; the flange is formed by bending the side of the connection terminal; the welding portion and the flange are both perpendicular to the connection portion, and the extension direction of the welding portion is opposite to that of the flange.

2. The module diode of the solar cell junction box according to claim 1, characterized in that: The flange and the welding portion are perpendicular to each other.

3. The module diode of the solar cell junction box according to claim 1, characterized in that: The busbar through hole and the welding portion are located between the chip end and the wiring portion of the terminal.

4. The module diode of the solar cell junction box according to any one of claims 1 to 3, characterized in that: The two sides of the package body extend to the two sides of the busbar through hole of the corresponding terminal, so that the package body forms an "I"-shaped structure.

5. The module diode of the solar cell junction box according to any one of claims 1 to 3, characterized in that: Both sides of the positive terminal and / or the negative terminal are provided with fool-proof through holes with different diameters.

6. The module diode of the solar cell junction box according to any one of claims 1 to 3, characterized in that: The wiring portion is a planar structure or a U-shaped rivet cup structure.

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