CN111769798A - An improved modular photovoltaic module bypass element and module junction box - Google Patents

Abstract

The invention provides an improved modularized photovoltaic assembly bypass element which comprises a first conductive terminal, a bypass protection device packaging module and a second conductive terminal, wherein one end, extending into an insulating plastic-sealed body, of the second conductive terminal is provided with a first protruding part and a second protruding part, two bypass protection devices are respectively arranged on the first protruding part and the second protruding part, and the area ratio of the first protruding part to the second protruding part is 0.8-1.2. The modularized photovoltaic module bypass element adopts a double-diode chip design, so that the current carrying capacity and the heat dissipation capacity of the bypass element are enhanced; the areas of the two convex parts of the conductive terminals of the two diode chips are designed to be nearly equal or equal, so that the current carrying capacity and the heat dissipation capacity can be optimized; the modular design can avoid producing the binding post of multiple structure when the terminal box adds man-hour, saves extra stamping die's input to make things convenient for the management of spare part in the production process, save the cost raise the efficiency.

Description

An improved modular photovoltaic module bypass element and module junction box

technical field

The invention relates to the technical field of solar photovoltaic power generation, in particular to an improved modular photovoltaic component bypass element and a photovoltaic component junction box with the bypass element.

Background technique

Solar photovoltaic modules are devices that convert solar energy into electrical energy. In the production process of photovoltaic modules, the junction box plays an important role in the effective output of photovoltaic energy. Its main function is to output the current generated by the photovoltaic modules and protect the solar photovoltaic modules. The current generated by each solar panel is relatively small, and a photovoltaic junction box is required to electrically connect multiple solar panels to each other, so that the currents generated by the multiple solar panels can be gathered together and output to form a photovoltaic system with a certain power generation capacity.

In actual use, the photovoltaic junction box is generally directly installed on the corresponding solar panel (also known as photovoltaic module) and electrically connected to the bus bar of the solar panel, and the junction box has a bypass protection device. At present, the photovoltaic junction box on the market is provided with positive and negative conductive terminals in the box body, and a bypass diode or a bypass integrated chip is connected between the positive and negative conductive terminals. Because the types and sizes of photovoltaic modules are different, there are many specifications of the current photovoltaic module junction boxes, and it is necessary to produce different specifications of shells, conductive terminals, etc. Conducive to cost reduction and efficiency increase. In addition, the current photovoltaic modules are developing in the direction of high-efficiency and high-power modules, such as shingled modules, double-glass modules, double-sided modules, etc., which brings new requirements to the junction boxes of key accessories of photovoltaic modules, such as junction boxes. The overcurrent capability of the junction box is relatively strong, and it is suitable for high current output; it is necessary to minimize the volume of the component and reduce the impact on the surface of the component; because the current passing through is relatively large, the heating of the junction box is relatively large, therefore, it is necessary to minimize the wiring In addition to the volume of the box, it is necessary to ensure that the junction box has a strong heat dissipation capacity; moreover, the production process of the junction box itself should be simplified and efficient as much as possible to ensure the reliability of the product and save costs.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the shortcomings in the prior art, and proposes an improved modular photovoltaic module bypass element, which is used in the photovoltaic module junction box, which saves manufacturing costs, facilitates parts management, and improves production efficiency. .

To achieve the above object, the present invention has adopted the following technical solutions:

An improved modular photovoltaic assembly bypass element, which includes a first conductive terminal, a bypass protection device packaging module and a second conductive terminal, and the bypass protection device packaging module is provided on the first conductive terminal and the second conductive terminal. Between the terminals, the bypass protection device encapsulation module includes an insulating plastic package, a bypass protection device placed inside the insulating plastic package, and an electrical connection piece connecting the bypass protection device and the conductive terminal. The inner end is inserted into the insulating plastic sealing body, and the first conductive terminal and the second conductive terminal are respectively connected with the two electrodes of the bypass protection device; wherein, the middle part of the end of the second conductive terminal extending into the insulating plastic sealing body is provided with a 90 A "T"-shaped slot with a degree of rotation is formed to form a first slot for the bus strip to pass through, a second slot matched with the end of the first conductive terminal, and first protrusions located on both sides of the second slot and The second protruding part, the first conductive terminal is provided with a third slot for the bus strip to pass through near the insulating plastic body; the middle part of one end of the first conductive terminal extending into the insulating plastic body is provided with a third slot a protruding part, the third protruding part is inserted into the second slot and has a gap with a set distance between the first protruding part and the second protruding part; two bypass protection devices are respectively arranged on the first protruding part and the second protruding part The protruding part and the second protruding part are electrically connected with the first protruding part and the second protruding part; the two ends of the electrical connecting piece are respectively electrically connected with the two bypass protection devices, and the middle part is connected with the third protruding part.

Preferably, the bypass protection device is a diode or an integrated circuit module.

Still more preferably, the ratio of the areas of the first protruding portion and the second protruding portion for setting the bypass protection device is 0.8-1.2.

More preferably, the ratio of the area of the first protruding portion to the second protruding portion is 0.9-1.1.

More preferably, the areas of the first protruding portion and the second protruding portion are equal.

Further preferably, the electrical connection piece includes two ends and a flat welding portion located in the middle, and a convex portion is formed between the flat welding portions.

More preferably, the width of the flat welding portion at both ends is smaller than the width of the protruding portion.

More preferably, the end of the first conductive terminal and/or the second conductive terminal is provided with a cable riveting part.

Further preferably, the first conductive terminal is provided with a first bus bar welding area; the second conductive terminal is provided with a second bus bar welding area.

According to another object of the present invention, the present invention also provides a photovoltaic module junction box, which includes a box body, a box cover, and the above-mentioned improved modular photovoltaic module bypass element disposed in the box body.

The beneficial effect of the present invention is that the improved modular photovoltaic module bypass element adopts the integrated packaging technology of conductive terminals and diodes to avoid secondary switching, and adopts dual diode chip design, which enhances the bypass element. The current-carrying capacity and heat-dissipating capacity of the two diode chips are nearly equal or equal to the area of the two protruding parts of the conductive terminals of the two diode chips, which can optimize the current-carrying capacity and heat-dissipating capacity; the modular design can avoid processing in the junction box It can produce terminal blocks of various structures at the same time, save the investment of additional stamping dies, facilitate the management of parts in the production process, save costs and improve efficiency.

Description of drawings

FIG. 1 is a schematic three-dimensional structure diagram of an improved modular photovoltaic module bypass element of the present invention;

FIG. 2 is a schematic view of the copper plate frame structure of the bypass element of the modular photovoltaic module of FIG. 1;

3 is a schematic plan view of the first conductive terminal and the second conductive terminal of the bypass element of the modular photovoltaic assembly of FIG. 1;

FIG. 4 is a schematic structural diagram of the second conductive terminal of FIG. 3;

FIG. 5 is a schematic structural diagram of the first conductive terminal of FIG. 3;

FIG. 6 is a schematic structural diagram of an electrical connection sheet of the bypass device, the first conductive terminal and the second conductive terminal.

In the figure, 10- the first conductive terminal, 11- the first slot hole of the bus strip, 12- the welding area of the bus strip, 20- the diode package module, 22- the diode chip, 30- the second conductive terminal, 31- the first bus strip Slotted hole, 32-bus strip welding area, 302-electrical connection piece, 40-cable wire riveting part.

Detailed ways

In order to have a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed descriptions are given in conjunction with the embodiments.

Please refer to FIG. 1 , which is a schematic three-dimensional structure diagram of an improved modular photovoltaic assembly bypass element of the present invention. The modular photovoltaic assembly bypass element includes a first conductive terminal 10 , a diode packaging module 20 and a second conductive terminal 10 . The conductive terminal 30 , see FIG. 2 , the diode package module 20 is disposed between the first conductive terminal 10 and the second conductive terminal 30 , the diode package module 20 includes an insulating plastic package 21 , and a diode placed inside the insulating plastic package 21 . The chip 22 and the electrical connection piece 302 connecting the diode chip and the conductive terminal, the inner end of the first conductive terminal 10 and the inner end of the second conductive terminal 30 are inserted into the insulating plastic body 21, the first conductive terminal 10, the second conductive terminal 30 They are connected to the P pole and the N pole of the diode chip 22, respectively.

Referring to FIGS. 2 to 5 , the middle of one end of the second conductive terminal 30 extending into the insulating plastic package 21 is provided with a “T”-shaped slot rotated 90 degrees to form a first slot for the bus strip to pass through. 31. The second slot 301 matched with the end of the first conductive terminal 10 and the first protruding portion 303 and the second protruding portion 304 on both sides of the second slot 301; the first conductive terminal 10 extends into The middle part of one end of the insulating plastic body 21 is provided with a third protruding part 101 , and the third protruding part 101 is inserted into the second slot 301 and has a space between the first protruding part 303 and the second protruding part 304 . The gap of the set distance; the two diode chips 22 are respectively disposed on the first protruding part 303 and the second protruding part 304 and are electrically connected with the first protruding part 303 and the second protruding part 304; the two ends of the electrical connecting piece 302 are respectively It is electrically connected to the two diode chips, and the middle is connected to the third protrusion 101 .

The invention adopts the integrated packaging technology of the conductive terminal and the diode, avoids secondary switching, enhances the conductivity of the diode, simplifies the process, and reduces the volume of the modular photovoltaic bypass element; Two diode chip welding parts are formed, and dual diode chips are used in the bypass element of the modular photovoltaic module, which can increase the current carrying capacity of the bypass element, improve the heat dissipation performance, and meet the application requirements of high-power photovoltaic modules.

In a preferred embodiment, the area ratio of the first protrusion 303 and the second protrusion 304 for attaching or soldering the diode chip is 0.8-1.2; in a more preferred embodiment, the first protrusion The ratio of the area of the part 303 to the second protruding part 304 is 0.9-1.1; optimally, the areas of the first protruding part 303 and the second protruding part 304 are equal.

Next, referring to the schematic structural diagram of the electrical connection piece 302 shown in FIG. 6 , it includes flat welding parts 3022 and 3023 at both ends and a flat welding part 3021 in the middle, and a raised part 3024 between the flat welding parts. The connecting piece (equivalent to a jumper) is welded at three points at the same time (see the three welding connection points A, B, and C in Figure 2), which can increase the amount of material, which is suitable for the application of high-current photovoltaic modules, and can also increase heat dissipation. In a preferred embodiment, the width of the flat welding portions 3022 and 3023 at both ends is smaller than the width of the protruding portion 3024 .

In another preferred embodiment, referring to FIG. 1 and FIG. 2 , the end of the second conductive terminal 30 is provided with a cable riveting part 40 (the cable riveting part shown in FIG. 2 is before being formed) Plane structure diagram), which is convenient for riveting the modular photovoltaic bypass element 200 and the cable when installing the photovoltaic junction box. The cable riveting portion 40 extends from the end of the second conductive terminal 30 and is formed into an integral structure with the second conductive terminal 30 through stamping processing. In a preferred embodiment of the present invention, the cable riveting portion 40 is in a U shape, and the two sides of the U shape are provided with slots 41, which can realize segmented riveting and improve the strength and reliability of the riveted connection. In practical application, in order to meet different application requirements, the cable riveting part may be provided at the end of any one of the first conductive terminal and the second conductive terminal, or may be located at the end of the first conductive terminal and the second conductive terminal. The ends of the two conductive terminals are all provided, which is not limited in the present invention.

Preferably, the first conductive terminal 10 is provided with a third slot 11 for passing the bus bar near the insulating plastic package 21 .

Preferably, the first conductive terminal 10 is provided with a first bus bar bonding area 12 ; the second conductive terminal 30 is provided with a second bus bar bonding area 33 . The first bus bar bonding area 12 may be a structure formed by a plane protrusion or depression of the first conductive terminal 10, and the second bus bar bonding area 33 may be a structure formed by a plane protrusion or depression of the second conductive terminal 30, which is convenient for work. The personnel can quickly locate the bus bar when welding, avoiding the deviation of the welding position.

According to another object of the present invention, the present invention also provides a photovoltaic module junction box, which includes a box body, a box cover, and the above-mentioned improved modular photovoltaic module bypass element disposed in the box body. The junction box can be a single-type junction box used alone or a split-type junction box used in combination. When applied to a split junction box consisting of a left box, a middle box, and a right box, modular photovoltaic bypass elements of the same structure can be installed in the left box, middle box, and right box. , the cable riveting part of the bypass element of the modular photovoltaic module in the left box is connected to the cable connected to the left box, and the cable riveting part of the bypass element of the modular photovoltaic module in the right box is connected to the cable connected to the right box Wire connection, the cable riveting part of the bypass element of the modular photovoltaic module inside the middle box is not connected to the cable, so that one structure can be used in different boxes to meet the installation requirements and avoid the production of multiple types of junction boxes during processing. The structure of the terminal block saves the investment of additional stamping dies, and facilitates the management of parts in the production process, saving costs and improving efficiency.

In summary, the present invention provides a modular photovoltaic module bypass element, which adopts the integrated packaging technology of conductive terminals and diodes to avoid secondary switching, and adopts a dual-diode chip design to enhance the load load of the bypass element. current capacity and heat dissipation capacity; the area of the two protruding parts of the conductive terminals of the two diode chips is designed to be close to equal or equal area, which can optimize the current carrying capacity and heat dissipation capacity; the ends of the conductive terminals are provided with cable riveting parts , When the modular photovoltaic bypass element is applied to the left box body or the right box body of the split junction box, the cable riveting part is connected to the cable respectively. One structure is applied to different boxes of the split junction box, so that it can avoid the production of terminal blocks of various structures during the processing of the junction box, save the investment of additional stamping dies, and facilitate the management of parts in the production process, saving Costs improve efficiency. In addition, it should be understood that the present invention uses a diode as the protection device of the modular bypass element, and an integrated circuit module with bypass protection function may also be used as the protection device, which is not particularly limited in the present invention.

The present invention has been described by the above-mentioned related embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention belong to the scope of patent protection of the present invention.

Claims (10)

1. An improved modularized photovoltaic assembly bypass element is characterized by comprising a first conductive terminal, a bypass protection device packaging module and a second conductive terminal, wherein the bypass protection device packaging module is arranged between the first conductive terminal and the second conductive terminal and comprises an insulating plastic package body, a bypass protection device arranged inside the insulating plastic package body and an electric connecting sheet for connecting the bypass protection device and the conductive terminals, the inner ends of the first conductive terminal and the second conductive terminal are inserted into the insulating plastic package body, and the first conductive terminal and the second conductive terminal are respectively connected with two electrodes of the bypass protection device; the middle part of one end of the second conductive terminal extending into the insulating plastic package body is provided with a T-shaped groove rotating by 90 degrees to form a first groove for the bus belt to pass through, a second groove matched with the end part of the first conductive terminal, and a first protruding part and a second protruding part which are positioned at two sides of the second groove, and a third groove for the bus belt to pass through is arranged on the first conductive terminal close to the insulating plastic package body; the middle part of one end of the first conductive terminal extending into the insulating plastic package body is provided with a third protruding part, and the third protruding part is inserted into the second slot and has a gap with a set distance with the first protruding part and the second protruding part; the two bypass protection devices are respectively arranged on the first protruding part and the second protruding part and are electrically connected with the first protruding part and the second protruding part; the two ends of the electric connection sheet are respectively and electrically connected with the two bypass protection devices, and the middle of the electric connection sheet is connected with the third protruding part.

2. An improved modular photovoltaic module bypass component as claimed in claim 1 wherein said bypass protection device is a diode or an integrated circuit module.

3. An improved modular photovoltaic module bypass element as claimed in claim 1 or 2, characterized in that the ratio of the area of said first and second protrusions for providing a bypass protection means is 0.8-1.2.

4. An improved modular photovoltaic module bypass element as claimed in claim 3 wherein said first and second protrusions have a ratio of area of 0.9 to 1.1.

5. An improved modular photovoltaic module bypass element as claimed in claim 4 wherein said first and second protrusions are of equal area.

6. An improved modular photovoltaic module bypass component as claimed in claim 3 wherein said electrical connection tabs include flat welds at both ends and at the middle with a raised portion between the flat welds.

7. An improved modular photovoltaic module bypass component as claimed in claim 6 wherein the width of the flat welds at both ends is less than the width of the bosses.

8. The improved bypass element of modular photovoltaic modules as claimed in claim 3, wherein said first conductive terminal and/or said second conductive terminal has a cable rivet at an end thereof.

9. The improved modular photovoltaic module bypass component according to claim 3, wherein the first conductive terminal has a first bus bar solder area; the second conductive terminal is provided with a second bus bar welding area.

10. A pv junction box comprising a box body, a box cover, and an improved modular pv bypass element as claimed in any one of claims 1 to 9 disposed within the box body.

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