A large-current photovoltaic junction box structure

Abstract

The application discloses a large-current photovoltaic junction box structure and belongs to the field of photovoltaic junction box structure design. The technical scheme of the application is that the pin of a diode, which is a main heat source radiating component, is welded below tin of a copper terminal, and a bus bar is welded on the tin of the copper terminal, so that a large amount of heat on the pin of the diode is taken away from the box body through the bus bar; the bus bar is provided with a perforation on the copper terminal, so as to quickly take away heat at two ends of the diode; the copper terminal is provided with a copper terminal bending, so as to increase the heat radiating area of the copper terminal and the diode axial surface, enhance heat exchange, quickly take away heat of the diode heat source, and enhance the structural strength of the side edge of the base. The application can effectively enhance the heat radiating effect of the box body under the condition of small width and small size, can realize a large bypass protection current, can reduce the temperature of the junction box during bypass protection, and can prolong the service life of the product.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of solar photovoltaic junction box structure design, and particularly relates to a large-current photovoltaic junction box, which is characterized by being capable of bearing large current. BACKGROUND

[0002] The solar photovoltaic junction box is a connector between a solar cell array composed of solar cell modules and a solar cell charging control device, and its main function is to connect and protect the solar photovoltaic module, so that the power generated by the solar cell is connected with the external line, and the electric energy generated by the solar cell module is led out through the cable. The photovoltaic junction box and the wiring system form a sealed space, the photovoltaic junction box provides protection against environmental influences for the wires and their connections, provides touchable protection for live parts, and reduces the tension for the wiring system connected therewith.

[0003] Due to the particularity of the use occasion of the solar cell and its own expensive value, the solar photovoltaic junction box must be specially designed to meet the use requirements of the solar cell module, and one of the technical indicators is the size of the working current of the module. The working current refers to the maximum forward current value allowed to pass through the diode when the diode works continuously for a long time. Because the current passing through the diode will heat the tube core and the temperature will rise, when the temperature exceeds the allowable limit, the tube core will be overheated and damaged. Therefore, the diode cannot exceed the rated forward working current value in use. When the hot spot effect occurs in the module, the current flows through the diode. Generally, the larger the working current, the better, so the working range of the photovoltaic junction box is larger. At the same time, in order to improve the power generation efficiency of the module and reduce the cost, it is required that the width and volume of the junction box are smaller and smaller. With the development of technology, the requirements for the current carrying capacity of the solar photovoltaic junction box and the miniaturization of the junction box become higher and higher, and the existing photovoltaic junction box structure has been unable to meet this use requirement. SUMMARY

[0004] The purpose of the present application is to provide a large-current photovoltaic junction box structure to solve the problem of insufficient large-current carrying capacity of the existing photovoltaic junction box as described in the background.

[0005] The technical solution of the present application is as follows:

[0006] The utility model provides a kind of high current photovoltaic junction box structure, including the box body that base and lid buckle are composed, copper terminal, diode and busbar are equipped inside the box body, diode and busbar are welded on copper terminal, copper terminal is installed in base together with diode and busbar, the diode is covered by filling potting glue inside the box body;The copper terminal is narrow and long, and the installation position of busbar on copper terminal is located in the central position of copper terminal and is located on both sides of diode, the bending direction when welding busbar is consistent with the length direction of copper terminal, and the installation position of diode main body on copper terminal is inclined to one side of copper terminal and is close to one side of base side wall.

[0007] Preferably, the copper terminal includes a first terminal block and a second terminal block, the first terminal block is provided with a first tin block on the front surface, and the second terminal block is provided with a second tin block on the front surface; the diode is mounted between the first terminal block and the second terminal block, and the diode is welded to the copper terminal through the pins at both ends thereof, and the welding area of the busbar on the copper terminal and the welding area of the diode on the copper terminal are located on the front and back surfaces of the copper terminal, respectively.

[0008] Preferably, the first terminal block and the second terminal block are respectively provided with a first busbar perforation and a second busbar perforation, and the first busbar perforation and the second busbar perforation are respectively located at both ends of the diode, and the busbar passes through the first busbar perforation and the second busbar perforation, respectively.

[0009] Preferably, the diode is provided with a first pin and a second pin at both ends thereof, respectively; the first pin and the second pin are both bent at an angle of 45 degrees or more, the first pin is welded below the first tin block of the first terminal block, and the second pin is welded below the second tin block of the second terminal block; and the two busbars are welded above the first tin block and the second tin block, respectively.

[0010] Preferably, the first terminal block and the second terminal block are respectively provided with a first copper terminal bend and a second copper terminal bend near the axial surface of the diode, and the angle of the first copper terminal bend and the second copper terminal bend is close to the diode along the axial surface of the diode without contacting the diode.

[0011] Preferably, the base is provided with a base protrusion, and the inner angle of the base protrusion is wrapped along the axial surface of the diode, and the distance between the outer wall and the inner wall of the base protrusion is consistent.

[0012] Preferably, the outer ring of the copper terminal is bent and close to the side wall of the base.

[0013] By adopting the above technical scheme, the application has the following beneficial technical effects:

[0014] The application is a large-current photovoltaic junction box, which is characterized by being capable of bearing large current. In the application, the pins of a diode, which is a main heat dissipation component of a heat source, are welded below tin, and a bus bar is welded on the tin, so that a large amount of heat on the pins of the diode is taken away from the box body through the bus bar. The heat on both ends of the diode is quickly taken away through the setting of a bus bar perforation. The heat source heat of the diode is quickly taken away by setting a copper terminal bending to increase the heat dissipation area of the copper terminal and the diode axial surface and enhance heat exchange. The heat source heat of the diode is quickly taken away by setting a base protrusion to increase the heat dissipation area of the copper terminal and the diode axial surface and enhance heat exchange. Moreover, the base protrusion does not increase the contact area of the base and the back plate on one hand, and enhances the structural strength of the side edge of the base on the other hand, so as to prevent thermal deformation. In summary, the photovoltaic junction box of the application can effectively enhance the heat dissipation effect of the box body, reduce the temperature generated during work, and greatly improve the service life of the photovoltaic junction box product under the condition of bearing large current.

[0015] The advantages of the application will be given in the description of the specific embodiment part below, some of which will become apparent from the following description or be understood through the practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the overall appearance diagram of the photovoltaic junction box of the application.

[0017] Figure 2 is the internal structure diagram of the photovoltaic junction box of the application.

[0018] Figure 3 is the front view of the copper terminal welded with the diode.

[0019] Figure 4 is the back view of the copper terminal welded with the diode.

[0020] Figure 5 is the position diagram of the bus bar perforation.

[0021] Figure 6 is Figure 5 the cross-sectional view of A-A of

[0022] Definitions of various marks in the figure: 1 base, 2 cover, 3 wire pressing buckle, 4 copper terminal, 5 diode, 6 first tin block, 7 second tin block, 41 first terminal block, 42 second terminal block, 51 first pin, 52 second pin, 81 first bus bar perforation, 82 second bus bar perforation, 91 first copper terminal bending, 92 second copper terminal bending, 11 base protrusion. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of the present application.

[0024] It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or there can be intervening components. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be intervening components. When a component is referred to as being "disposed" on another component, it can be directly on the other component or there can be intervening components. The terms "vertical", "horizontal", "left", "right", and similar terms as used herein are for purposes of illustration only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0026] Figure 1 and Figure 2 The structure of the positive terminal junction box or the negative terminal junction box in the split junction box is shown. The split junction box is to split the junction box into a positive terminal junction box, a negative terminal junction box and a plurality of intermediate junction boxes, so as to minimize the connection length, disperse the heat of the diodes, and pre-seal the electrical components in the intermediate junction boxes, so that only the positive terminal junction box and the negative terminal junction box need to be sealed on site, reducing the on-site workload and improving the connection reliability. The embodiment is described by taking the split junction box as an example. Obviously, the structural design of the present application is also applicable to the single junction box. Figure 1 The overall appearance of the photovoltaic junction box is shown, Figure 2 The internal structure of the photovoltaic junction box is shown. Referring to Figure 1 The photovoltaic junction box of the present application comprises a box body composed of a base 1 and a cover 2 that are buckled together. In this embodiment, as the terminal junction boxes at both ends of the split junction box, one end of the base 1 is provided with a wire pressing buckle 3, which is used for connecting the internal structure of the box body after the photovoltaic cable is passed through the middle of the wire pressing buckle 3. If it is an intermediate junction box of the split junction box, there is no such structure. Referring to Figure 2The internal structure of the box body includes copper terminals 4 and diodes 5. The copper terminals 4 include a plurality of pieces, which are sleeved on the guide posts in the base 1 to be fixed in the base 1. After the photovoltaic cable is inserted into the box body, the cable is welded with the copper terminals 4. The diodes 5 are welded on the copper terminals 4 to electrically connect the plurality of copper terminals 4. Moreover, the box body in the area below the diodes 5 is filled with potting adhesive. In addition, bus bars are welded on the first tin blocks 6 and the second tin blocks 7 of the copper terminals 4 respectively. The bus bars are not shown in the figure. As shown in the figure, the installation position of the bus bars on the copper terminals 4 is in the middle of the copper terminals 4, while the installation position of the diodes 5 on the copper terminals 4 is deviated to one side. The function of the above structure is that the bus bars are located in the middle of the entire box body, which is convenient for heat dissipation of the bus bars.

[0027] Figure 3 and Figure 4 The welding position of the diode, the peripheral structure of the diode shaft surface and the heat dissipation mode of the bus bar are shown. Referring to Figure 3 and Figure 4 The copper terminals 4 include a first terminal block 41 and a second terminal block 42. The first terminal block 41 is provided with the first tin blocks 6 on the front surface, and the second terminal block 42 is provided with the second tin blocks 7 on the front surface. The diodes 5 are installed between the first terminal block 41 and the second terminal block 42, and the first terminal block 41 and the second terminal block 42 are electrically connected by the pins of the diodes 5. The diodes 5 are respectively provided with first pins 51 and second pins 52 at both ends. The first pins 51 and the second pins 52 are both 90° bent. The first pins 51 are welded below the first tin blocks 6 of the first terminal block 41 by resistance welding, and the second pins 52 are welded below the second tin blocks 7 of the second terminal block 42 by resistance welding. Two bus bars are welded above the first tin blocks 6 and the second tin blocks 7 respectively. The function of the above structure is that the diode is a heat source, and the pin is one of the main components for heat dissipation of the heat source. The pin of the diode is welded below the tin, and the bus bar is welded above the tin, so that the welding area of the bus bar on the copper terminal and the welding area of the diode on the copper terminal are located at opposite positions on the front and back surfaces of the copper terminal respectively, which is convenient for taking away a large amount of heat on the pin of the diode through the bus bar.

[0028] Figure 5 and Figure 6 The peripheral structure of the diode is shown. Referring to Figure 5 The first terminal block 41 and the second terminal block 42 are respectively provided with first bus bar perforations 81 and second bus bar perforations 82, which are located at both ends of the diodes 5. The function of the above structure is that the bus bar is arranged in the first bus bar perforations 81 and the second bus bar perforations 82 to quickly take away the heat at both ends of the diode. Referring to Figure 6 The first terminal block 41 and the second terminal block 42 are respectively provided with first copper terminal bends 91 and second copper terminal bends 92 near the diode shaft surface (see Figure 4), the angle of the first copper terminal bend 91 and the second copper terminal bend 92 is close to the diode along the diode axial surface. The function of the above structure is to increase the heat dissipation area of the copper terminal and the diode axial surface to enhance heat exchange and quickly lead away the heat of the diode heat source. The outer ring of the first terminal block 41 and the second terminal block 42, i.e. the side close to the box body, also has a bend. The function of the above structure is that the bend increases the heat dissipation area of the copper terminal and the box body to enhance heat exchange and quickly lead away the heat on the copper terminal. Referring to Figure 6 The base 1 has an inward base protrusion 11, and the inside of the base protrusion 11 wraps along the diode axial surface. The function of the above structure is to increase the heat dissipation area of the base and the diode axial surface to enhance heat exchange. In addition, the distance between the outer wall and the inner wall of the base protrusion 11 is consistent, i.e. the thickness at the base protrusion 11 is not changed. The function of the above structure is that on the one hand, the contact area of the base and the back plate is not increased, and on the other hand, the structural strength of the side edge of the base is enhanced to prevent thermal deformation.

[0029] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A large current photovoltaic junction box structure, comprising a box body composed of a base and a cover, a copper terminal, a diode and a bus bar are arranged in the box body, the diode and the bus bar are welded on the copper terminal, the copper terminal is installed in the base together with the diode and the bus bar, and the box body is filled with potting glue to cover the diode; characterized in that: the copper terminal is narrow and long, the installation position of the bus bar on the copper terminal is located at the central position of the copper terminal and on both sides of the diode, the bending direction of the bus bar during welding is consistent with the length direction of the copper terminal, the installation position of the diode main body on the copper terminal is deviated to one side of the copper terminal and close to one side of the side wall of the base; the copper terminal comprises two parts of a first terminal block and a second terminal block, a first tin block is arranged on the front surface of the first terminal block, and a second tin block is arranged on the front surface of the second terminal block; the diode is installed between the first terminal block and the second terminal block, the diode is welded with the copper terminal through the pins at both ends thereof, and the welding area of the bus bar on the copper terminal and the welding area of the diode on the copper terminal are respectively located on the front and back surfaces of the copper terminal; the diode is provided with a first pin and a second pin at both ends thereof; the first pin and the second pin are both bent at an angle of 45 degrees or more, the first pin is welded below the first tin block of the first terminal block, and the second pin is welded below the second tin block of the second terminal block; two bus bars are respectively welded above the first tin block and the second tin block; the first terminal block and the second terminal block are respectively provided with a first bus bar perforation and a second bus bar perforation, the first bus bar perforation and the second bus bar perforation are respectively located at both ends of the diode, and the bus bars respectively pass through the first bus bar perforation and the second bus bar perforation to lead away the heat at both ends of the diode. the first terminal block and the second terminal block are respectively provided with a first copper terminal bending and a second copper terminal bending close to the axial surface of the diode, and the angle of the first copper terminal bending and the second copper terminal bending is close to the diode along the axial surface of the diode without contact. the base is provided with a base protrusion, the inner angle of the base protrusion is wrapped along the axial surface of the diode, and the distance between the outer wall and the inner wall of the base protrusion is consistent. the outer ring of the copper terminal is bent and close to the side wall of the base.

2. A high current photovoltaic junction box structure according to claim 1, characterized in that: ​ 3. A high current PV junction box structure according to claim 1, characterized in that: ​ 4. A high current PV junction box structure according to claim 1, characterized in that: ​

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