CN105450171A - Double-glass solar cell module junction box - Google Patents

Abstract

The invention proposes a double-glass solar cell module junction box, which includes a base, a lid-shaped upper cover fastened with the base, a high-temperature-resistant plastic bottom plate is arranged inside the base, and conductive copper plate electrodes, diodes, etc. are arranged on the bottom plate It is connected between adjacent conductive copper plate electrodes, and the two ends of the base are provided with cable buckles, and the cables connected from the junction box are fixed with the junction box through the cable buckles. The upper cover of the double-glass solar cell module junction box of the present invention is in the shape of a box cover, which increases the creepage distance and is safer to use; the upper cover is designed with a water outlet hole to allow the water entering the junction box to flow out from the hole; the bottom plate and the base The split design is adopted, and the bottom plate is made of high-temperature-resistant plastic to enhance the overcurrent capability of the copper plate on it; ultrasonic welding is used to make the process simpler and more reliable.

Description

A double-glass solar cell module junction box

technical field

The invention relates to the field of solar photovoltaic technology, in particular to a junction box for a double-glass solar cell module.

Background technique

With the global climate change and the increasingly serious environmental pollution problems, green renewable energy has been paid more and more attention and developed rapidly. Solar energy is a renewable resource, and the solar cell technology that uses the photovoltaic effect to generate electricity has attracted worldwide attention. Solar cells are made of materials that can produce photovoltaic effects, such as silicon, gallium arsenide, indium selenide copper and other materials, which can convert light energy into electrical energy. Due to the opacity of traditional silicon wafer solar cell modules, they are generally used in relatively remote outdoor sites to form photovoltaic power generation systems or placed on top of buildings, which limits the application range of photovoltaic power generation; therefore, better light transmittance The double-glass solar cell module was developed. The double-glass module is a photovoltaic module composed of two pieces of glass and a solar cell in the middle. It can be directly used as a building material product to build a photovoltaic-building integrated project (BIPV), such as a building Curtain walls, sun rooms, carports, etc., can reasonably use the effective area and space of the building to generate electricity, and can be used on a large scale even in cities.

In the actual use of photovoltaic modules, it is necessary to use the photovoltaic module junction box to lead out the electrical energy generated by the photovoltaic modules and connect them to external loads. Therefore, the photovoltaic module junction box is a key component of photovoltaic modules to build various power generation systems. In addition to being the most basic electrical energy extraction component, the junction box is also required to protect photovoltaic modules. Therefore, the quality and electrical reliability of the junction box itself have an important impact on the safe and stable operation of photovoltaic modules and even the entire photovoltaic power generation system. Therefore, when designing the junction box, it is necessary to consider its own electrical connection protection; in addition, consider The double-glass module needs better light transmission. The junction box of the double-glass module is generally made much smaller than the ordinary module junction box. The inner space of the box is small, and the high temperature of the conductive copper sheet is more likely to affect the surrounding zero Components will affect the overcurrent capability of the conductive copper plate in the box; in addition, the creepage distance of the junction box with the traditional flat structure is relatively small, which affects the safety of its use.

Contents of the invention

Aiming at the problems in existing applications, the present invention proposes a junction box suitable for double-glass solar cell modules, which can have safer creepage distance and higher overcurrent capability, and the manufacturing process is simpler.

In order to achieve the purpose of the present invention, a double-glass solar cell module junction box of the present invention includes a base, a lid-shaped upper cover that is fastened with the base, a high-temperature-resistant plastic bottom plate is arranged inside the base, and a Conductive copper plate electrodes, diodes are connected between adjacent conductive copper plate electrodes, cable buckles are arranged at both ends of the base, and the cables connected from the junction box are fixed with the junction box through the cable buckles.

Preferably, the upper cover is provided with a plurality of water outlet holes.

More preferably, the base and the bottom plate are of separate design.

More preferably, the bottom plate material is nylon.

More preferably, the cable buckle and the base are fixed by ultrasonic welding.

The upper cover of the double-glass solar cell module junction box of the present invention is in the shape of a box cover, which increases the creepage distance and is safer to use; the upper cover is designed with a water outlet hole to allow the water in the junction box to flow out from the hole; the bottom plate and the base The split design is adopted, and the bottom plate is made of high-temperature-resistant plastic to enhance the overcurrent capability of the copper plate on it; ultrasonic welding is used to make the process simpler and more reliable.

Description of drawings

The foregoing and other objects, features and advantages of the present invention will become apparent from the following detailed description in conjunction with the accompanying drawings. in:

Fig. 1 is a schematic exploded view of the overall structure of a junction box of a double-glass solar cell module of the present invention;

FIG. 2 is a schematic structural view of the upper cover of the junction box in FIG. 1;

Figure 3 is a schematic top view of Figure 2;

Fig. 4 shows the base of the junction box of Fig. 1 and its internal structure diagram;

Figure 5 is a schematic top view of Figure 4;

Figure 6A shows a schematic diagram of the creepage distance of an existing junction box;

Fig. 6B shows a schematic diagram of the creepage distance of the junction box of the present invention.

detailed description

Referring to the exploded schematic diagram of the overall structure of a junction box of a double-glass solar cell module according to an embodiment of the present invention shown in Figure 1 and the schematic diagrams of the structure of its components shown in Figures 2 to 5, the junction box includes a base 20, the upper cover 10 in the shape of a box lid fastened with the base 20, the base 20 is provided with a high-temperature resistant plastic bottom plate 22, the conductive copper plate electrode 24 is arranged on the bottom plate 22, and the diode 26 is connected to the adjacent conductive copper plate electrode Between, two ends of the base 22 are provided with cable buckles 28, and the cables 30 connected from the junction box are fixed with the junction box through the cable buckles 28.

The upper cover of the junction box in this embodiment is in the shape of a hollow box cover instead of a flat upper cover. In the existing junction box, as shown in Figure 6A, the upper cover 10' basically adopts a flat structure, and the joint gap between the upper cover 10' and the base 20' is at the upper part of the box cover. The creepage distance is d' (the distance from the conductive copper plate electrode 24' to the bonding gap); and in the present invention, the upper cover 10 adopts a lid-shaped structure, and the bonding gap between the upper cover 10 and the base 20 is at the bottom of the junction box. The creepage distance at this time is (d1+d2) (the distance from the conductive copper plate electrode 24 to the bonding gap). Obviously, the design of the present invention increases the creepage distance, making the junction box safer to use.

In a preferred embodiment, the upper cover 10 is provided with a plurality of water outlet holes 12, so that the water vapor in the junction box can flow out from the water outlet holes 12, which improves the safety of the junction box.

In addition, the bottom plate 22 and the base 20 of the junction box adopt a split design, and the bottom plate 22 is made of high-temperature-resistant plastics such as nylon, which can allow a relatively large temperature rise without causing damage to the base due to the heating of the conductive copper plate and causing scrapping of the junction box. Enhance the overcurrent capability of the junction box.

The cable buckle 28 and the base 20 are fixed by ultrasonic welding. Ultrasonic welding is to use high-frequency vibration waves to transmit to the surface of the base and the buckle to be welded. Under pressure, the surfaces of the two objects are rubbed against each other to form fusion between the molecular layers. This welding process is simple and reliable, and ensures the strength of cable fixing.

The junction box of the double-glass solar cell module of the present invention adopts the shape of the box cover, which increases the creepage distance and is safer to use; the upper cover is designed with a water outlet hole to allow the water entering the junction box to flow out from the hole; the bottom plate and the base adopt a split type Design, the bottom plate is made of high-temperature-resistant plastic, which enhances the current capacity of the junction box; the cable is fixed by ultrasonic welding, and the process is simpler and more reliable.

The present invention is not limited to the described embodiment, and those skilled in the art can still make some amendments or changes without departing from the spirit of the present invention, that is, within the disclosed scope, so the protection scope of the present invention is defined by the claims range prevails.

Claims (5)

1. a two glass solar module terminal box, it is characterized in that, described terminal box comprises base, the upper cover of the lid shape fastened with base, be provided with high-temperature resistance plastice base plate in described base, described base plate arranged conductive copper plate electrode, diode is connected between adjacent conductive copper plate electrode, the two ends of base are provided with cable buckling, and the cable picked out from terminal box is fixed by cable buckling and terminal box.

2. a kind of two glass solar module terminal box as claimed in claim 1, is characterized in that, cover and be provided with multiple apopore on described.

3. a kind of two glass solar module terminal box as claimed in claim 1, it is characterized in that, described base and base plate are split-type design.

4. a kind of two glass solar module terminal box as claimed in claim 1, it is characterized in that, described baseboard material is nylon.

5. a kind of two glass solar module terminal box as claimed in claim 1, is characterized in that, adopt ultrasonic bonding to fix between described cable buckling and base.