CN102709372B - Photovoltaic module - Google Patents

Abstract

The invention discloses a photovoltaic assembly, comprising: n solar cell strings, the n solar cell strings are arranged in the same direction, each solar cell string includes two strings of solar cell strings and a junction box; The two strings of solar cells in the solar cell string are connected to the first end of the solar cell string, and the two adjacent strings of solar cells located in different cell strings are connected to the second end of the solar cell string. end, the junction box is arranged at the second end of the solar cell string, and is connected with two strings of solar cell strings located in the same solar cell string, and the n junction boxes are connected in series with each other; wherein, n is a positive integer greater than 2. The photovoltaic module can save the confluence belt required for the solar battery strings to be centrally connected to the junction box in the middle, reduce the path of current transmission, further reduce the loss of power transmission, and improve the power supply efficiency of the photovoltaic module.

Description

A photovoltaic module

technical field

The invention belongs to the field of photovoltaic power generation, and in particular relates to a photovoltaic module.

Background technique

In recent years, the production technology of solar cells has been continuously improved, the production cost has been continuously reduced, and the conversion efficiency has been continuously improved, making the application of photovoltaic power generation increasingly popular and developing rapidly, and gradually becoming an important source of power supply. Solar cells can convert light energy into electrical energy under sunlight irradiation to realize photovoltaic power generation.

The production process of solar cells is relatively complicated. Simply put, the current production process of solar cells mainly includes: texturing, diffusion, etching, coating, printing and sintering. In the actual application of solar cells, it is necessary to connect a large number of solar cells to form a solar cell string, after packaging, and then connected to a junction box to form a photovoltaic module. The junction box of the photovoltaic module is an interface for outputting voltage. The existing solar battery strings and junction boxes are connected as shown in Figure 1. A plurality of solar battery strings 1 are arranged in sequence, and every two battery strings are connected in series to form a battery string. In a group 10, the battery string group 10 Both the positive output terminal and the negative output terminal are centrally connected to the junction box 2 located in the middle of the module, and then two positive and negative wires are drawn out from the junction box 2. The positive and negative wires are connected to other photovoltaic modules.

Since the efficiency of existing solar cells is difficult to be greatly improved, in order to improve the power supply efficiency of photovoltaic modules, reducing the power supply loss of photovoltaic modules has become the first choice when the efficiency of solar cells is fixed, so how to Reducing the power loss of photovoltaic modules is an important development direction in the field of photovoltaic power generation.

Contents of the invention

In view of this, the object of the present invention is to provide a photovoltaic component to reduce the power loss of the existing photovoltaic component.

The photovoltaic module, including:

n solar cell strings, the n solar cell strings are arranged in the same direction, and each solar cell string includes two solar cell strings and a junction box;

Two strings of solar cells located in the same solar cell string are connected to the first end of the solar cell string, and two adjacent strings of solar cells located in different battery strings are connected to the end of the solar cell string At the second end, the junction box is arranged at the second end of the solar cell string, and is connected to two strings of solar cell strings in the same solar cell string, and the n junction boxes are connected in series;

Wherein, n is a positive integer greater than 2.

Preferably, each junction box is provided with a bypass diode.

Preferably, each bypass diode is connected in series between two strings of solar cells belonging to the same solar cell string group.

Preferably, the solar battery string includes a plurality of solar battery slices connected in series.

Preferably, two cables are connected out from the two junction boxes located at both ends of the component, which serve as lead wires for the positive and negative electrodes of the component respectively.

Preferably, the components also include:

a surface protection substrate, the solar cell strings are laid on the surface of the surface protection substrate;

a back sheet, the back sheet covers the surface of the solar battery string, and is sealed with the surface protection substrate by encapsulation glue.

Preferably, the junction box is arranged on a side of the surface protection substrate away from the solar cell string.

Preferably, the surface protection substrate is provided with wiring openings, and the wiring openings are arranged correspondingly to the junction boxes.

Preferably, the junction box is connected to the solar battery string through the junction opening.

Preferably, the n is 3.

Since the photovoltaic assembly provided by the present invention includes: n solar cell strings, the n solar cell strings are arranged in the same direction, each solar cell string includes two strings of solar cell strings and a junction box; The two strings of solar cells in the solar cell string are connected to the first end of the solar cell string, and the adjacent two strings of solar cells located in different cell strings are connected to the second end of the solar cell string. end, the junction box is arranged at the second end of the solar cell string, and is connected to two strings of solar cell strings in the same solar cell string, and the n junction boxes are connected in series with each other; wherein, n is a positive integer greater than 2. It can be seen that the solar battery strings no longer need to be centrally connected to the junction box in the middle, so the confluence belt required for the solar battery strings to be centrally connected to the middle junction box can be saved, and the path of current transmission can be reduced. Reduce the loss of power transmission and improve the power supply efficiency of photovoltaic modules.

In addition, when the photovoltaic module provided by the present invention is connected with other photovoltaic modules, since the photovoltaic module provided by the present invention can connect the power transmission cables at the junction boxes at both ends, it can save the existing photovoltaic module from the middle Part of the cables connected to both ends of the junction box, thereby saving production costs.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of an existing photovoltaic module;

Fig. 2 is a schematic structural diagram of a photovoltaic module provided by the present invention;

Fig. 3 is a schematic structural diagram of another photovoltaic module provided by the present invention;

Fig. 4 is a front structural schematic diagram of another photovoltaic module provided by the present invention;

Fig. 5 is a schematic diagram of the back view of another photovoltaic module provided by the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As mentioned in the background art, how to reduce the power transmission loss of photovoltaic modules is an important direction for the development of existing solar cells.

The inventors have found through research that by adding a junction box, the use of busbars can be reduced, thereby reducing the power transmission loss of the existing photovoltaic modules, and improving the power supply efficiency of the photovoltaic modules.

The invention discloses a photovoltaic module, comprising: n solar battery strings, the n solar battery strings are arranged in the same direction, and each solar battery string includes two solar battery strings and a junction box;

Two strings of solar cells located in the same solar cell string are connected to the first end of the solar cell string, and two adjacent strings of solar cells located in different battery strings are connected to the end of the solar cell string At the second end, the junction box is arranged at the second end of the solar cell string, and is connected to two strings of solar cell strings in the same solar cell string, and the n junction boxes are connected in series;

Wherein, n is a positive integer greater than 2.

It can be seen from the above scheme that since the solar battery strings of the photovoltaic module provided by the present invention no longer need to be centrally connected to the junction box in the middle, the junction box in which each solar battery string is centrally connected to the middle can be saved The required confluence belt reduces the path of current transmission, thereby reducing the loss of power transmission and improving the power supply efficiency of photovoltaic modules.

The above is the core idea of the present application. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention. rather than all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, and those skilled in the art can do it without departing from the meaning of the present invention. By analogy, the present invention is therefore not limited to the specific examples disclosed below.

The embodiment of the present invention discloses a photovoltaic module, as shown in Figure 2, including: n solar cell strings, the n solar cell strings are arranged in the same direction, which are the first solar cell string 101, the second solar cell string The second solar cell string 102, the third solar cell string 103...the nth solar cell string 10n, each solar cell string includes two solar cell strings 100 and a junction box, wherein the solar cell string 100 Including multiple solar cells connected in series;

And, two strings of solar cell strings 100 located in the same solar cell string are connected to the first end of the solar cell string, and two strings of solar cell strings 100 located in different cell strings and adjacent to each other are connected to the solar cell string 100. The second end of the battery string, that is, the 2n series of solar battery strings 100 is connected end to end, and the junction box is arranged at the second end of the solar battery string, and is connected to the two strings of solar cells in the same solar battery string. connected in series, and n junction boxes are connected in series with each other, corresponding to the solar battery string group, they are respectively the first junction box 201, the second junction box 202, the third junction box 203...the nth The junction box 20n, the solar cells, the solar cell strings, the solar cell strings and the junction box are all connected by busbars.

In addition, two cables are connected from the two junction boxes located at both ends of the component, which are respectively used as the positive and negative leads of the component, that is, the first cable L1 is connected to the first junction box 201 as The positive lead wire of the photovoltaic module is connected to the second cable L2 at the nth junction box 20n as the negative lead lead of the photovoltaic module. When the matrix installation of the power station is performed, the photovoltaic module and other The photovoltaic modules are connected through a first cable L1 and a second cable L2.

Moreover, when the solar cells are irradiated by strong light, some solar cells will be blocked by other objects and become loads. In order to prevent these solar cells that become loads from being severely heated and damaged, a A bypass diode is provided, and the bypass diode is connected in series between two strings of solar battery strings belonging to the same solar battery string group.

It should be noted that the n is a positive integer greater than 2, as shown in Figure 3, preferably n is 3, that is, the photovoltaic module includes 3 solar cell strings, 6 solar cell strings, and 3 junction boxes. In addition, the n can also be 4, that is, the photovoltaic module includes 4 solar cell strings, 8 solar cell strings, 4 junction boxes, or n is 5, 6 or 7, that is, the specific value of n It depends on the actual situation, and no specific limitation is made here.

Since the solar battery strings of the photovoltaic module provided by the present invention no longer need to be centrally connected to the junction box in the middle, it is possible to save the confluence belt required for the centralized connection of each solar battery string to the middle junction box, reducing The path of small current transmission, thereby reducing the loss of power transmission and improving the power supply efficiency of photovoltaic modules.

Moreover, when the photovoltaic assembly provided by the present invention is connected to other photovoltaic assemblies, since the photovoltaic assembly provided by the present invention can connect the first cable at the first junction box at one end, and connect the first cable at the first junction box at the other end, The second cable is connected to the junction box as the positive and negative leads of the photovoltaic module, and the photovoltaic module is connected to other photovoltaic modules through the first cable and the second cable, which can save The cables connected from the intermediate junction box to both ends of the existing photovoltaic modules are dropped, thereby saving production costs.

In addition, as shown in Figure 4 and Figure 5, the components also include:

A surface protection substrate 110, the solar cell strings are laid on the surface of the surface protection substrate 110, and the surface protection substrate 110 is a transparent substrate, preferably tempered glass,

Back plate 111, the back plate 111 covers the surface of the solar cell string, and is sealed with the surface protection substrate 110 by encapsulation glue to protect the solar cells. The material of the back plate 111 is mostly TPT (Tedlar PET Tedlar, polyvinyl fluoride composite film), has the characteristics of insulation, waterproof and corrosion resistance.

The n junction boxes are arranged on the side of the back plate 111 away from the solar battery strings.

Specifically, the back plate 111 is provided with a connection opening, and the connection opening is provided correspondingly to the junction box, and the junction box is connected to the solar battery string through the connection opening.

Another embodiment of the present invention is a method for manufacturing a photovoltaic module, comprising:

Step S1, providing a surface protection substrate, the surface protection substrate is a transparent substrate, preferably a tempered glass substrate.

Step S2, laying encapsulation glue on the surface of the surface protection substrate, the encapsulation glue is preferably EVA (Ethylene-Vinyl Acetate copolymer, ethylene-vinyl acetate copolymer) glue.

Step S4, laying 2n strings of solar cell strings on the encapsulation glue, the 2n strings of solar cell strings respectively belong to n solar cell string groups, and the two strings of solar cell strings belonging to the same solar cell string group are connected to the solar cells The first ends of the strings belong to different battery strings and two adjacent strings of solar cells are connected to the second end of the solar cell strings, that is, the 2n strings of solar cells are connected end to end, wherein the n is a positive integer greater than 2.

Step S5 , laying encapsulation glue on the 2n strings of solar cell strings, the encapsulation glue is preferably EVA glue.

Step S6, laying a backboard on the packaging glue, the backboard is a TPT (Tedlar PET Tedlar, polyvinyl fluoride composite film) backboard, which has the characteristics of insulation, waterproof and corrosion resistance.

Step S7, placing the packaged components above in a laminator, vacuuming and heating.

Step S8, adding an aluminum alloy frame around the component, and forming a wiring opening at the position where the junction box is preset on the backplane.

Step 9: Provide a junction box, which includes a bypass diode, and connects the junction box to the solar battery string through the wiring opening, and the junction box is specifically arranged on the solar battery string The second end of the string group is connected with two strings of solar cell strings located in the same solar cell string group, and n junction boxes are connected in series with each other to finally form a photovoltaic module.

It can be seen that the solar cell strings of the photovoltaic module do not need to be centrally connected to the junction box in the middle, so the confluence belt required for the solar cell strings to be centrally connected to the middle junction box can be saved, and the current transmission can be reduced. path, thereby reducing the loss of power transmission and improving the power supply efficiency of photovoltaic modules.

Each part in this manual is described in a progressive manner, and each part focuses on the difference from other parts, and the same and similar parts of each part can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (1)

1. A photovoltaic module, characterized in that, comprising: n solar cell strings, the n solar cell strings are arranged in the same direction, and each solar cell string includes two solar cell strings and a junction box; A bypass diode is arranged in each junction box, and the bypass diode is connected in series between two strings of solar cell strings belonging to the same solar cell string group; The solar battery string includes a plurality of solar battery slices connected in series; Two strings of solar cells located in the same solar cell string are connected to the first end of the solar cell string, and two adjacent strings of solar cells located in different battery strings are connected to the end of the solar cell string At the second end, the junction box is arranged at the second end of the solar cell string, and is connected to two strings of solar cell strings in the same solar cell string, and the n junction boxes are connected in series; The two junction boxes located at both ends of the component are connected with two cables, which are respectively used as the positive and negative leads of the component; Wherein, the n is 3; A surface protection substrate, the solar cell strings are laid on the surface of the surface protection substrate, and the surface protection substrate is tempered glass; A back sheet, the back sheet covers the surface of the solar cell string, and is sealed with the surface protection substrate by encapsulation glue, and the back sheet material is TPT; The junction box is arranged on the side of the backplane away from the solar cell string; The surface protection substrate is provided with a wiring opening, and the wiring opening is arranged correspondingly to the junction box, and the junction box is connected to the solar battery string through the wiring opening; The solar cells, the solar cell strings, the solar cell string groups and the junction box are all connected by busbars.