CN111969947A - Photovoltaic module bypass element assembly with excellent heat dissipation performance and junction box - Google Patents

Abstract

The present invention provides a photovoltaic module bypass element assembly with excellent heat dissipation performance, which includes a modular bypass element and an auxiliary heat dissipation element arranged therebelow, and the modular bypass element includes a first conductive terminal, an insulating package module and a second Conductive terminal, the conductive terminal is provided with a bus strip welding area and a bus strip slot, and at least one bypass protection device is provided on one end surface of the first conductive terminal; the insulating packaging module encapsulates the bypass protection device inside it; auxiliary heat dissipation The element includes first and second heat dissipation elements arranged on the left and right, respectively located on both sides of the insulating package module; the heat dissipation element includes a plane part, a side edge perpendicular to the plane part, and a positioning part. The invention also provides a junction box. The photovoltaic module bypass element assembly of the present invention, on the basis of the modular bypass element design, and the auxiliary heat dissipation element design adapted to it, significantly improves the heat dissipation capability of the bypass element assembly, and is suitable for high current application environment. Thermal performance.

Description

Bypass components and junction boxes for photovoltaic modules with excellent heat dissipation performance

technical field

The invention relates to the technical field of solar photovoltaic power generation, in particular to a photovoltaic assembly bypass element assembly and a junction box with excellent heat dissipation performance, especially suitable for high-power photovoltaic assemblies.

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 device is relatively strong, and it is suitable for high current output; it is necessary to minimize the volume of the component and reduce the shading effect on the surface of the component. Therefore, a bypass protection device and positive and negative conductive terminals are designed. The modular bypass element can greatly reduce the size of the junction box and standardize the junction box. However, it has been verified by actual use that in the case of a small junction box box, it only depends on the area of the conductive terminal (usually copper sheet) itself. For high current applications, for example, when the current exceeds 30A, the heat dissipation effect is far from meeting the needs of use; therefore, how to ensure that the junction box has a strong heat dissipation capacity while minimizing the size of the junction box. The service life of the junction box and the safety of photovoltaic modules during the working process have become problems that need to be solved urgently.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the shortcomings in the prior art, and proposes a photovoltaic module bypass element assembly with excellent heat dissipation performance, which is used in a photovoltaic module junction box to improve production efficiency and ensure high current use environment. Thermal performance.

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

A photovoltaic module bypass element assembly with excellent heat dissipation performance, which comprises a modular bypass element and an auxiliary heat dissipation element arranged under the modular bypass element, the modular bypass element includes a first conductive terminal, an insulating package A module and a second conductive terminal, the first conductive terminal is provided with a first bus strip welding area and a first bus strip slot, and the second conductive terminal is provided with a second bus strip welding area and a second bus strip slot hole , at least one bypass protection device is provided on the surface of one end adjacent to the first conductive terminal and the second conductive terminal, and the bypass protection device is electrically connected to the second conductive terminal through a jumper or a brazing sheet; so The insulating package module encapsulates the bypass protection device in its interior; the auxiliary heat dissipation element includes a first heat dissipation element and a second heat dissipation element arranged on the left and right, and the first heat dissipation element and the second heat dissipation element are respectively located in the insulating package. two sides of the package module; the first heat dissipation element and the second heat dissipation element include a plane part in contact with the lower surfaces of the first conductive terminal and the second conductive terminal, a side perpendicular to the plane part and a positioning part, the The positioning portion corresponds to the position of the positioning holes on the first conductive terminal and the second conductive terminal, and the direction of the side edge is upward bending or downward bending.

Preferably, the welding area of the first busbar and the welding area of the second busbar are concave structures, and the first heat dissipation element and the second heat dissipation element of the auxiliary heat dissipation element correspond to the welding area of the first busbar and the second busbar The position of the welding area is provided with a concave part, and the lower surface of the welding area of the bus strip abuts the upper surface of the concave part.

Further preferably, the first heat dissipation element and the second heat dissipation element have the same structure and are arranged symmetrically from left to right.

Further preferably, the first heat dissipation element and the second heat dissipation element of the auxiliary heat dissipation element are formed into an integrated structure through an insulating plastic connecting portion.

Further preferably, a plurality of bypass protection devices are arranged on the first conductive terminal at uniform intervals.

Still preferably, a heat dissipation hole is provided on the lower half of the insulating package module corresponding to the welding position of the bypass protection device on the first conductive terminal, and the exposed metal surface of the conductive terminal can be directly seen through the heat dissipation hole.

Still preferably, protruding ribs are provided at the ends of the first conductive terminal and the second conductive terminal, and the modular bypass element and the cable are connected by resistance welding.

Further preferably, the bypass protection device is a diode chip or an integrated circuit module with bypass protection function.

According to another object of the present invention, the present invention proposes a photovoltaic module junction box using the above-mentioned bypass element assembly, the junction box includes a box cover, a box body, and the above-mentioned photovoltaic module bypass disposed in the box body. component assembly.

More preferably, the junction box is a single-type junction box or a split-type junction box.

Further preferably, the side edge of the auxiliary heat dissipation element of the bypass element assembly of the photovoltaic assembly abuts against the side wall of the box body.

The photovoltaic module bypass element assembly with excellent heat dissipation performance of the present invention, on the basis of the modular bypass element design, and the auxiliary heat dissipation element design adapted to it, significantly improves the heat dissipation capability of the bypass element assembly, and can simplify the design of the bypass element assembly. process, reducing the volume of the modular photovoltaic bypass element; it is convenient to set multiple bypass protection devices on the conductive terminals to increase the current carrying capacity of the bypass element, so as to adapt to the heat dissipation performance under high current application environment, adapt to Application requirements of high-power photovoltaic modules. In addition, modular bypass elements and auxiliary heat dissipation elements can achieve standardized design, save the investment of additional stamping dies, facilitate the management of parts in the production process, save costs and improve efficiency.

Description of drawings

1 is a schematic exploded perspective view of a three-dimensional structure of a bypass element assembly of a photovoltaic module with excellent heat dissipation performance according to an embodiment of the present invention;

FIG. 2 is a schematic exploded perspective view of a three-dimensional structure of a bypass element assembly of a photovoltaic module with excellent heat dissipation performance according to another embodiment of the present invention;

FIG. 3 is a schematic diagram showing the exploded structure of the junction box of the bypass element assembly of the present invention.

The numbers and names of some components in the figure are as follows:

110-modular bypass element, 120-auxiliary heat dissipation element, 10-first conductive terminal, 11-first busstrip slot, 12-first busstrip land, 20-insulation package module, 22-diode chip, 30-Second conductive terminal, 31-Second busstrip slot hole, 32-Second busstrip welding area, 302-Jumper wire, 40-Ribbon.

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 structural diagram of a photovoltaic module bypass element assembly with excellent heat dissipation performance according to an embodiment of the present invention. The bypass element assembly includes a modular bypass element 110 and a bypass element disposed next to the modular The auxiliary heat dissipation element 120 below the circuit element 110, the modular bypass element 110 includes a first conductive terminal 10, an insulating package module 20 and a second conductive terminal 30, and the first conductive terminal 10 is provided with a first bus With the welding area 12 and the first busstrip slot 11, the second busstrip welding area 32 and the second busstrip slot 31 are provided on the second conductive terminal 30, the first conductive terminal 10 and the second conductive terminal are connected. At least one bypass protection device is provided on the adjacent end surface, and the bypass protection device is electrically connected to the second conductive terminal through a jumper wire or a brazing sheet; the insulating packaging module 20 encapsulates the bypass protection device in the second conductive terminal. inside; the auxiliary heat dissipation element 120 includes a first heat dissipation element 121 and a second heat dissipation element 122 arranged on the left and right sides, and the first heat dissipation element 121 and the second heat dissipation element 122 are respectively located on both sides of the insulating package module 20; The first heat dissipation element 121 and the second heat dissipation element 122 include a plane portion 1201 in contact with the lower surfaces of the first conductive terminal 10 and the second conductive terminal 30, a side edge 1203 perpendicular to the plane portion 1201, and a positioning portion 1204, The positioning portion 1204 corresponds to the position of the positioning hole 24 on the first conductive terminal 10 and the second conductive terminal 30 ; the direction of the side edge 1203 may be upward bending or downward bending.

Preferably, the first busbar welding area 12 and the second busbar welding area 32 on the modular bypass element 110 are set by punching the metal plates of the first conductive terminal 10 and the second conductive terminal 30 The concave structure formed by the distance, in this way, a certain amount of solder can be pre-stored in the welding areas 12 and 32 before the bus strip is welded, so that the efficiency of the bus strip welding can be improved; Corresponding positions of the element 121 and the second heat dissipating element 122 are provided with concave portions 1202 , and the lower surface of the welding area of the busbar is abutted against the upper surface of the concave portion.

In another preferred embodiment, the first heat dissipation element 121 and the second heat dissipation element 122 have the same structure and are arranged symmetrically from left to right.

In another embodiment of the present invention, referring to FIG. 2 , the first heat dissipation element 121 and the second heat dissipation element 122 of the auxiliary heat dissipation element 120 are formed into an integral structure through the insulating plastic connecting portion 1212 , so that the parts can be easily It also facilitates the installation of the junction box during production and simplifies the assembly process.

In a preferred embodiment, in order to adapt to the occasion of high current application, a plurality of bypass protection devices are arranged on the first conductive terminal evenly spaced, so that it can adapt to the high current passing ability of the high power photovoltaic module, With the auxiliary heat dissipation element of the present invention, the heat dissipation performance under the working environment of high current can be guaranteed.

In another preferred embodiment, corresponding to the welding position of the bypass protection device on the first conductive terminal, a heat dissipation hole (not shown) is provided on the lower half of the insulating package module 20, and the heat dissipation hole can directly See the exposed metal surface of the conductive terminal (that is, the metal surface on the backside of the welding position of the bypass protection device on the first conductive terminal in this embodiment); in a more preferred embodiment, the heat dissipation hole may be a long strip The slot hole or one or more cylindrical holes; this design can further improve the heat dissipation capacity of the bypass element assembly.

In another preferred embodiment, when the modular bypass element 110 is welded with the cable, resistance welding is used to connect the cable to the end of the first conductive terminal and/or the second conductive terminal The connection is fixed by direct resistance welding; more preferably, in order to enhance the effect of resistance welding, protruding ribs 40 are provided at the ends of the first conductive terminal and the second conductive terminal, and the protruding ribs are directly formed by stamping A raised structure with a certain height is formed by punching a material with a certain width and length at the end of the conductive terminal. In practical application, in order to meet different application requirements, the protruding rib 40 may be disposed at the end of any one of the first conductive terminal and the second conductive terminal, or may be located on the first conductive terminal and the second conductive terminal. The ends of the conductive terminals are all provided, which is not limited in the present invention.

It should be understood that the present invention refers to the conductive terminal on the right side of the modular bypass element 110 in the drawings as the first conductive terminal, and the conductive terminal on the left side as the second conductive terminal, only for the purpose of implementing the present invention It is not intended to limit the setting position of the bypass protection element; in the specific implementation, the user can also set the right conductive terminal in the above embodiment as the first conductive terminal, and the left conductive terminal as the first conductive terminal. Two conductive terminals, this should be regarded as an equivalent implementation of the above-mentioned embodiment.

In addition, it should be understood that the bypass protection device of the present invention can use a diode chip as the protection device of the modular bypass element, and can also use an integrated circuit module with a bypass protection function as the protection device, which is not covered by the present invention. Specially limited.

According to another object of the present invention, the present invention provides a photovoltaic module junction box using the above-mentioned bypass element assembly, the junction box includes a box cover, a box body, and a bypass element assembly 100 disposed in the box body; In a preferred embodiment, referring to FIG. 3 , the junction box is a split junction box, including a left junction box, a middle junction box and a right junction box, and the left junction box, the middle junction box and the right junction box include a box cover. 101. Box body (left box body 102, middle box body 103, right box body 104) and bypass element assembly 100 placed in the box body; first conductive terminal 10 of bypass element assembly 100 in left box body 102 It is connected with one end of the cable 106, and the other end of the cable 106 is connected with the connector female plug 105; the second conductive terminal 30 of the bypass element assembly 100 in the right box 104 is connected with one end of the cable 106, and the The other end is connected to the connector male plug 108, and one end of the left box body 102 and the right box body 104 is respectively provided with a cable wire fixing member 107 to fix the cable wire and the box body; in a preferred embodiment, the bypass The side edge 1203 of the auxiliary heat dissipation element 120 of the component assembly 100 abuts against the side wall of the box body.

The photovoltaic module bypass element assembly with excellent heat dissipation performance of the present invention, on the basis of the modular bypass element design, and the auxiliary heat dissipation element design adapted to it, significantly improves the heat dissipation capability of the bypass element assembly, and can simplify the design of the bypass element assembly. process, reducing the volume of the modular photovoltaic bypass element; it is convenient to set multiple bypass protection devices on the conductive terminals to increase the current carrying capacity of the bypass element, so as to adapt to the heat dissipation performance under high current application environment, adapt to Application requirements of high-power photovoltaic modules. In addition, modular bypass elements and auxiliary heat dissipation elements can achieve standardized design, save the investment of additional stamping dies, facilitate the management of parts in the production process, save costs and improve efficiency.

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 (11)

1. A photovoltaic module bypass element assembly with excellent heat dissipation performance is characterized by comprising a modularized bypass element and an auxiliary heat dissipation element arranged below the modularized bypass element, wherein the modularized bypass element comprises a first conductive terminal, an insulation packaging module and a second conductive terminal, a first convergence belt welding area and a first convergence belt slotted hole are formed in the first conductive terminal, a second convergence belt welding area and a second convergence belt slotted hole are formed in the second conductive terminal, at least one bypass protection device is arranged on the surface of one end, adjacent to the first conductive terminal and the second conductive terminal, of the first conductive terminal, and the bypass protection device is electrically connected with the second conductive terminal through a jumper wire or a copper welding sheet; the insulation packaging module packages the bypass protection device inside; the auxiliary heat dissipation element comprises a first heat dissipation element and a second heat dissipation element which are arranged on the left and the right, and the first heat dissipation element and the second heat dissipation element are respectively positioned on two sides of the insulating packaging module; the first heat dissipation element and the second heat dissipation element comprise plane portions, side edges and positioning portions, the plane portions are in contact with the lower surfaces of the first conductive terminal and the second conductive terminal, the side edges are perpendicular to the plane portions, the positioning portions correspond to the positions of the positioning holes in the first conductive terminal and the second conductive terminal, and the side edges are bent upwards or downwards.

2. The photovoltaic module bypass element assembly with excellent heat dissipation performance as recited in claim 1, wherein the first and second bus bar lands are recessed, and the first and second heat dissipation members of the auxiliary heat dissipation member are provided with recessed portions at positions corresponding to the first and second bus bar lands, and a lower surface of the bus bar land abuts against an upper surface of the recessed portions.

3. The photovoltaic module bypass element assembly with excellent heat dissipation performance according to claim 1 or 2, wherein the first heat dissipation element and the second heat dissipation element have the same structure and are arranged in a left-right symmetrical manner.

4. The photovoltaic module bypass element assembly with excellent heat dissipation performance of claim 3, wherein the first heat dissipation element and the second heat dissipation element of the auxiliary heat dissipation element are integrally formed through an insulating plastic connection portion.

5. The photovoltaic module bypass element assembly with excellent heat dissipation performance as recited in claim 4, wherein a plurality of bypass protection devices are uniformly spaced on the first conductive terminal.

6. The photovoltaic module bypass element assembly with excellent heat dissipation performance of claim 4, wherein heat dissipation holes are formed on the lower half portion of the insulating packaging module corresponding to the positions of the first conductive terminals where the bypass protection devices are welded, and the exposed metal surfaces of the conductive terminals can be directly seen through the heat dissipation holes.

7. The photovoltaic module bypass element assembly with excellent heat dissipation performance of claim 4, wherein the end portions of the first conductive terminal and the second conductive terminal are provided with ribs, and the modular bypass element and the cable are connected by resistance welding.

8. The photovoltaic module bypass element assembly with excellent heat dissipation performance according to claim 4, wherein the bypass protection device is a diode chip or an integrated circuit module with bypass protection function.

9. A photovoltaic module junction box comprising a box cover, a box body, and a photovoltaic module bypass element assembly as claimed in any one of claims 1 to 8 disposed in the box body.

10. The photovoltaic module junction box of claim 9 wherein said junction box is a single piece junction box or a split piece junction box.

11. The photovoltaic module junction box of claim 10 wherein the side of the auxiliary heat sink element of the photovoltaic module bypass element assembly abuts the side wall of the box body.

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