CN103701408B - Glue type photovoltaic junction box - Google Patents

Abstract

The present invention discloses a kind of encapsulating type photovoltaic junction box, comprise the base and upper cover that mutually cover, in base, base plate is installed, base plate is provided with terminal, terminal is provided with strap clamp, diode, photovoltaic cable is connected with terminal through the Line pressing buckle be arranged in base, and filling above base plate in base has fluid sealant.Most hot spot of the present invention direct contact solar backboard, base bottom offers convection cavity, base end face and base plate height of formation poor, above covered ventilation hole, good heat dissipation effect; Metalwork has been covered with box body inner chamber, and the area of dissipation after encapsulating is large, uniform heat distribution; Base periphery is bent to form coaming plate, and forms cavity by coaming plate, accelerates again heat radiation while reducing encapsulating amount; Terminal edge adds flange, plays the effect increasing area of dissipation; Convergent belt welds and clamps dual fixing, and terminal, base plate are firmly connected with base three, and reliability is high; There is boss as fulcrum, can conveniently prize strap clamp and realize installing/dismounting.

Description

Glue type photovoltaic junction box

technical field

The invention relates to the field of photovoltaic power generation, in particular to a glue-filled photovoltaic junction box used in a photovoltaic power generation system.

Background technique

In the electrical connection technology of photovoltaic power generation systems, photovoltaic junction boxes are usually used to realize the electrical connection between photovoltaic modules and inverters. Since the application of the photovoltaic junction box is usually an outdoor environment, it is an important consideration in the design of the photovoltaic junction box to prevent the infiltration of rainwater and other media from affecting the internal electrical connection. The glue-filled photovoltaic junction box is sealed and waterproof by filling glue, which is a better solution at present. The current glue-filled photovoltaic junction box is the same as the ordinary junction box, and an installation cavity is provided between the box bodies, and the diode is installed in the installation cavity. Since the diode will generate a higher temperature during operation, as the temperature of the diode continues to rise, the resistance in the diode will continue to increase, causing the diode to generate more heat, thereby wasting more power resources and entering a vicious circle . In order to ensure better heat dissipation of the photovoltaic junction box, the method of increasing the volume of the installation cavity in the photovoltaic junction box is generally adopted, thereby increasing the thickness and volume of the entire photovoltaic junction box. More importantly, it is difficult to achieve good heat dissipation by using this method cooling effect. Therefore, how to make the glue-filled photovoltaic junction box have an excellent heat dissipation and ventilation effect while achieving the sealing effect has become a research hotspot in the industry.

Contents of the invention

The purpose of the present invention is to provide a glue-filled photovoltaic junction box with high heat dissipation performance and sealing performance. Through the design of the overall heat dissipation characteristics and the design of the installation structure, the air convection and rapid heat transfer of the glue-filled photovoltaic junction box can be realized to achieve internal heat balance. And protect the diode, so that the product has higher reliability.

Technical scheme of the present invention is as follows:

A glue-filled photovoltaic junction box, including a base and an upper cover that are covered with each other. A bottom plate is installed in the base, and a plurality of terminals are installed on the bottom plate. Each terminal is respectively equipped with a belt clip. Diodes are installed between them; the photovoltaic cable is connected to the terminal through the crimping buckle installed in the base; the base is filled with sealant above the bottom plate;

The terminals and the bottom plate are evenly distributed in the base; the terminals and the bottom plate are made of heat-resistant materials, and the base is made of non-heat-resistant materials; when the bottom plate is assembled in the base, the bottom surface of the bottom plate and the bottom surface of the base are in different positions. On the horizontal plane, there is a convection cavity on the bottom surface of the base below the bottom plate; a through hole is provided on the bottom surface of the bottom plate where no terminals are installed, and the bottom of the through hole is sealed by an adhesive plate;

The periphery of the base is provided with a shroud bent along the shape of the bottom plate and perpendicular to the bottom surface of the base; the base has a plurality of cavities surrounded by the shroud; the edge of the terminal has a convex plate perpendicular to the bottom surface of the terminal, The convex plate of the terminal is in contact with the surrounding plate of the base; the top surface of the upper cover has an upward protrusion, and the top surface and side surfaces of the upper cover have a plurality of ventilation holes corresponding to the positions of the cavities on the base.

Its further technical solution is: the pins of the diode are welded on two adjacent terminals, the terminals are installed on the bottom plate, and the bottom plate is installed on the base.

Its further technical solution is: one side of the bottom plate is the installation surface of the terminal, which includes a plurality of side-by-side installation units, each installation unit can be installed with one terminal; each installation unit has two sides on both sides A pair of blocks consisting of two blocks, a gap is formed between the two blocks of each pair of blocks; there is a clip on the terminal, and the two ends of the clip are respectively inserted into the gap of the pair of blocks at the corresponding position; The position corresponding to the block pair in the base is provided with a card slot, the size of the card slot is smaller than the size of the block pair when it is in a relaxed state, and the two blocks of the card block pair are connected to the corresponding position of the card. into the slot and shrinks inward, clamping the clip on the terminal.

Its further technical solution is: the edge of the base is provided with a boss, and there is a gap for prying between the boss and the belt clamp.

Its further technical solution is: said each terminal has a busbar hole for the busbar to pass through, and a solder groove for the busbar to weld.

The beneficial technical effect of the present invention is:

In terms of thermal characteristics optimization, the present invention prevents the hottest part from directly contacting the solar backplane, opens a hollowed-out convection cavity at the bottom of the base at the hottest part, and directly forms a step height difference between the bottom surface of the base and the bottom plate. The processed ventilation holes make the heat dissipate quickly and play the role of heat dissipation and cooling; by covering the inner cavity of the box with metal parts, the heat dissipation area after filling the glue is larger, and the heat distribution in the box is more uniform; by bending the periphery of the base Form a coaming plate, and form multiple cavities through the coaming plate, which reduces the amount of glue pouring and accelerates heat dissipation; by increasing the convex plate on the edge of the terminal, it has the effect of increasing the heat dissipation area after glue filling; through the surface of the upper cover The convex design effectively increases the internal space of the photovoltaic junction box and is also conducive to the improvement of heat dissipation performance. In the optimization of the installation structure, the present invention designs the installation position of the confluence belt and the fixed structure with double guarantees of welding and clamping for the glue-filled photovoltaic junction box, and designs a firm and reliable connection structure of the terminal, the bottom plate and the base, and The boss is designed as a fulcrum to facilitate the installation and removal by prying the belt clip.

Advantages of the invention will be set forth in the description which follows in the detailed description, and in part will be apparent from the description which follows, or can be learned by practice of the invention.

Description of drawings

Figure 1 is an exploded view of the present invention.

Fig. 2 is a structure diagram of the upper cover of the present invention.

Fig. 3 is a terminal structure diagram of the present invention.

Fig. 4 is a structure diagram of the bottom plate of the present invention.

Fig. 5 is a structural diagram of the base of the present invention.

Fig. 6 is an internal structure diagram of the present invention.

Fig. 7 is a rear view of the present invention.

Detailed ways

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Fig. 1, the present invention includes a base 6 and an upper cover 1 that cover each other, a base plate 5 is installed in the base 6, and a plurality of terminals 4 of different shapes, a plurality of belt clips 2 and a plurality of diodes are installed on the base plate 5 3. As shown in FIG. 6 , the installation method is to install diodes 3 between adjacent terminals 4 , and to install belt clips 2 on each terminal 4 . As shown in FIG. 1 , two crimping ties 7 are installed in the base 6 , and two strands of photovoltaic cables 8 pass through the crimping ties 7 and are welded to the terminals 4 .

As shown in FIG. 3 , each terminal 4 has a bus strip hole 4 - 1 for the bus strip to pass through, and a solder groove 4 - 3 for the bus strip to weld. When the bus strip (not shown in the figure) is installed, pass it from the bottom of the bus strip hole 4-1 of the terminal 4 to the top of the terminal 4, and weld it at the position of the solder slot 4-3 of the terminal 4, and the bus strip is simultaneously clamped by the strip clamp 2 Clamping and fixing, double reliability guarantee.

As shown in FIG. 6 , the two pins of the diode 3 are soldered to two adjacent terminals 4 , the terminals 4 are installed on the bottom plate 5 , and the bottom plate 5 is installed on the base 6 .

A connection method of the terminal 4 , the bottom plate 5 and the base 6 is given here. As shown in FIG. 4 , one side of the bottom plate 5 is the installation surface of the terminal 4 , and it includes a plurality of side-by-side installation units, and each installation unit can accommodate one terminal 4 for installation. Both sides of each installation unit respectively have a block pair composed of two block blocks 5 - 1 , and a gap is formed between the two block blocks 5 - 1 of each block pair. As shown in FIG. 3 , the terminal 4 is provided with a clamping plate 4 - 2 , and the two ends of the clamping plate 4 - 2 are respectively inserted into the gaps of the clamping block pairs at corresponding positions during installation. As shown in Figure 5, a slot 6-4 is provided at the position corresponding to the pair of blocks in the base 6, and the size of the slot 6-4 is smaller than the size of the pair of blocks when it is not installed; -4 and the clamping block 5-1 interfere with each other, and the two clamping blocks 5-1 of the clamping block pair are clamped in the corresponding slots 6-4 and shrink inward, clamping the clamping plate on the terminal 4 from both sides 4-2 fixed.

As shown in Figure 5 again, the edge of the base 6 is provided with a boss 6-5, and as shown in Figure 6 after installation, there is a gap for prying between the boss 6-5 and the belt clamp 2. With the help of the boss 6-5 as a fulcrum, the belt clip 2 can be easily pried.

Since the present invention is a glue-filling type, the space above the bottom plate 5 in the base 6 is filled with sealant. As shown in Figure 7, a through hole 5-2 is provided on the bottom surface of the bottom plate 5 where no terminal 4 is installed, and the bottom of the through hole 5-2 is sealed with a paste plate (not shown in the figure), so the sealant will not flow into the through hole 5 -2 in the space below.

As shown in FIG. 7 , when the bottom plate 5 is assembled in the base 6 , the bottom surface of the bottom plate 5 and the bottom surface of the base 6 are on different horizontal planes, and the bottom surface of the base 6 below the bottom plate 5 has a convection cavity 6 - 1 . Wherein, the terminals 4 and the bottom plate 5 are made of heat-resistant materials, such as metal; the base 6 is made of non-heat-resistant materials. Such a structure makes the bottom of the base 6 of the photovoltaic junction box and the bottom plate 5 form a height difference, and the parts of the terminal 4 and the bottom plate 5 that generate the most heat in the box will not directly contact the solar backplane, avoiding the heat on the terminals 4 and the bottom plate 5. Conducted to the base 6, thereby affecting the solar panel below.

As shown in Figure 6, the metal terminals 4 and the bottom plate 5 are evenly distributed in the base 6, covering at least 90% of the bottom surface area of the inner cavity of the base 6, basically covering the inner cavity of the box, so that the heat dissipation after filling the glue The area is larger, and the heat distribution in the box is more uniform.

As shown in FIG. 5 , the periphery of the base 6 is provided with a surrounding board 6 - 2 bent along the shape of the bottom plate 5 and perpendicular to the bottom surface of the base 6 , and the surrounding board 6 - 2 is used to surround the sealant when pouring glue. The base 6 also has a plurality of cavities 6-3 formed after the connection of the coamings 6-2. The positions of the cavities 6-3 do not need to be filled with glue, which reduces the amount of glue filled and saves costs. At the same time, the cavities 6-3 -3 can also make heat dissipation faster, killing two birds with one stone.

As shown in Figure 4 again, the edge of the terminal 4 has a convex plate 4-3 perpendicular to the bottom surface of the terminal 4, and the convex plate 4-3 of the terminal 4 is in contact with the coaming plate 6-2 of the base 6 during installation, which can increase the filling capacity. Heat dissipation area after glue.

In addition, as shown in Figure 2, the top surface of the upper cover 1 has an upward protrusion 1-1, which effectively increases the internal space of the box body and is also conducive to the improvement of heat dissipation performance; A plurality of ventilation holes 1-2 corresponding to the position of the cavity 6-3 on the base 6 can form air convection inside and outside the box, and play a role in heat dissipation and cooling.

What is described above is only a preferred embodiment of the present invention, and the present invention is not limited to the above examples. It can be understood that other improvements and changes directly derived or conceived by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims (4)

1. A glue-filling type photovoltaic junction box, comprising a base (6) and a loam cake (1) that cover each other, a base plate (5) is installed in the base (6), and a base plate (5) is installed on the base plate (5) A plurality of terminals (4), each terminal (4) is respectively installed with a belt clip (2), and a diode (3) is installed between each terminal (4); the photovoltaic cable (8) passes through and is installed on the base (6 The crimping buckle (7) in ) is connected with the terminal (4); the base (6) is filled with sealant above the bottom plate (5); It is characterized in that: the terminals (4) and the bottom plate (5) are evenly distributed in the base (6); the terminals (4) and the bottom plate (5) are made of heat-resistant materials, and the base (6) is made of non-heat-resistant Material; when the bottom plate (5) is assembled in the base (6), the bottom surface of the bottom plate (5) and the bottom surface of the base (6) are on different horizontal planes, and the bottom surface of the base (6) below the bottom plate (5) A convection cavity (6-1) is opened on the top; a through hole (5-2) is provided on the bottom surface of the bottom plate (5) without terminals (4), and the bottom of the through hole (5-2) is covered by a pasting plate seal; The periphery of the base (6) is provided with a coaming plate (6-2) bent along the shape of the bottom plate (5) and perpendicular to the bottom surface of the base (6); A plurality of cavities (6-3) surrounded; the edge of the terminal (4) has a convex plate (4-3) perpendicular to the bottom surface of the terminal (4), and the convex plate (4-3) of the terminal (4) 3) It is in contact with the coaming plate (6-2) of the base (6); the top surface of the upper cover (1) has an upward protrusion (1-1), and the top surface and side surfaces of the upper cover (1) There are a plurality of ventilation holes (1-2) corresponding to the positions of the cavities (6-3) on the base (6); One side of the bottom plate (5) is the installation surface of the terminal (4), which includes a plurality of side-by-side installation units, and each installation unit can be installed with one terminal (4); the two sides of each installation unit have respectively A block pair consisting of two blocks (5-1), a gap is formed between the two blocks (5-1) of each block pair; a block plate (4-2) is provided on the terminal (4) ), the two ends of the clamping plate (4-2) are respectively inserted into the gaps of the corresponding position clamping block pair; the position corresponding to the clamping block pair is provided with a clamping groove (6-4) in the base (6), The size of the clamping slot (6-4) is smaller than the size of the clamping block pair when it is in a relaxed state, and the two clamping blocks (5-1) of the clamping block pair are clamped between the clamping slots (6-4) at the corresponding positions and retract inwardly, clamping the clamping plate (4-2) on the terminal (4). 2. The glue-filled photovoltaic junction box according to claim 1, characterized in that: the pins of the diode (3) are welded to two adjacent terminals (4), and the terminals (4) are installed on the bottom plate (5), the base plate (5) is mounted on the base (6). 3. The glue-filled photovoltaic junction box according to claim 1, characterized in that: the edge of the base (6) is provided with a boss (6-5), and the boss (6-5) is connected with the belt clip ( 2) There is a gap for prying between them. 4. The glue-filled photovoltaic junction box according to claim 1, characterized in that: each terminal (4) has a bus belt hole (4-1) for the bus belt to pass through, and a bus belt hole (4-1) for the bus belt to weld. Solder bath (4-3).