CN105280738B - Split-type conjunction box used for solar assembly and solar cell assembly thereof - Google Patents

Abstract

The invention discloses a split junction box for solar modules, which comprises a first junction box, an intermediate junction box and a second junction box which are independent of each other, the middle junction box is arranged between the first junction box and the second junction box, and the second junction box is arranged between the first junction box and the second junction box. The first line box is connected to the negative pole of the photovoltaic connector, and the second line box is connected to the positive pole of the photovoltaic connector. Each line box includes a box body and a cover that can be closed. The diode, the terminal used to connect the lead wire of the component, and the two conductors connecting the bypass diode and the terminal, and two connection positions distributed laterally between the two conductors, so that the bypass diode and the terminal are horizontally arranged side by side ground setting. At the same time, the invention also discloses a solar cell assembly using the split junction box for the solar assembly. The invention effectively prevents the hot spot effect and improves the photoelectric conversion efficiency of the solar cell.

Description

Split junction box for solar module and solar cell module thereof

technical field

The invention relates to a junction box, in particular to a split junction box for a solar module and a solar battery module thereof, and belongs to the technical field of solar modules.

Background technique

The solar junction box is the connector between the solar battery array and the solar battery charging control device. Its main function is to transmit the electric energy generated by the solar battery module to the battery for storage through the cable.

In the prior art, the junction box is generally installed on the back of the cells. Due to the large size of the traditional single-type junction box, it will block the back of the 2-4 cells in the middle two strings. In addition, the longer cables are also It will cover the back of some cells. The shielding of the cells by the junction box affects the heat dissipation of the cells on the one hand, and on the other hand, a large part of the heat generated by the junction box will be transferred to the cells of the module, causing the temperature of the cells to rise, while the power generation efficiency of photovoltaic modules It is negatively correlated with temperature. The power temperature coefficient of a typical polycrystalline module is about -0.4%/°C. Taking a 60-piece 156 polycrystalline module (average power about 255W) as an example, when the temperature of the module rises by 1°C, the power Drop 1.02W. Moreover, the existing single junction box will cover two cells, and the blocking area is usually about 100 square centimeters, which is enough to generate a hot spot effect on the back of the double-sided cell, causing the back of the cell to be short-circuited by the bypass diode , lose the power generation function.

For this reason, people have carried out various attempts and improvements, have designed split junction box. However, the existing split-type junction box diodes are also arranged at the front end of the lead wire welding clamping column. The longitudinal length of the entire junction box is very long, which will still cause a large area to block the battery. In addition, the cables and terminals will also be blocked. The above technical problems have not yet been well resolved due to the shading of the cells, resulting in a decrease in the efficiency of the photovoltaic module and the hot spot effect.

Contents of the invention

The present invention aims at the technical problems in the prior art that the junction box has a large volume, blocks the cells, produces a hot spot effect, and leads to a reduction in the photoelectric conversion efficiency of the module, and provides a split junction box for solar modules, which is small in size and reduces the need for components. The shading improves the photoelectric conversion efficiency of the module; at the same time, the present invention also provides a solar cell module using the split junction box for the solar module to improve the power generation efficiency of the solar cell module.

For this reason, the present invention adopts following technical scheme:

A split junction box for solar modules, comprising a first junction box (10), an intermediate junction box (20) and a second junction box (30) which are independent of each other, and the intermediate junction box (20) is arranged in the first junction box (10) and the second wire box (30), the first wire box (10) is connected to the negative pole of the photovoltaic connector, and the second wire box (30) is connected to the positive pole of the photovoltaic connector. Each wire box includes a box body (1) and can The box cover of the closed box body is characterized in that: a bypass diode (2), a terminal (3) for connecting the lead wire of the component and a connection post for connecting the bypass diode are respectively arranged in the box body (1) of each wire box The two conductors of the terminal (3) form two connection positions (4) distributed laterally between the two conductors so that the bypass diode (2) and the terminal (3) are horizontally arranged side by side.

Further, the two conductors are the first conductor (5) and the second conductor (6), and the two ends of the first conductor (5) are bent to form parallel to the second conductor (6). The two first connection parts (5a) respectively form the two connection positions (4) between the two first connection parts (5a) and the second conductor (6).

Further, the second conductor (6) is located between the two first connecting parts (5a) of the first conductor.

Further, two second connection parts (6a) respectively connected to the two first connection parts (5a) are formed on the second conductor (6).

Further, the conductor is copper-based.

Further, there are one or more intermediate wire boxes (20).

The split-type junction box for solar modules of the present invention redesigns the structure of the junction box. By arranging the diodes and the welding posts of the lead wires in parallel, the bypass diode is installed on the left or right side of the junction post, so that the longitudinal length of the junction box The shape is reduced and flat, so that the junction box can avoid the position of the battery sheet after installation, which is beneficial to the heat dissipation of the component, and can also reduce the amount of heat generated by the junction box transferred to the battery sheet of the module; on the other hand, the wire After the box structure becomes flat and long, it is more conducive to the heat dissipation of the wire box; at the same time, the flat and long wire box of the present invention is also more suitable for double-sided battery components, because the flat and long wire box can completely avoid the battery sheet The shading of the back can be realized without changing the solar cell module itself, which saves the cost of the module and improves the reliability of the solar module.

At the same time, the present invention also provides a solar cell module (100) using the split junction box for the solar module, comprising several cells (101), upper glass and a back plate, and the cells are connected by interconnecting bars and busbars. The strip (102) is connected and connected with the terminal post (3) of the split junction box for the solar module through the module lead wire (103).

Further, the battery sheet (101) is a double-sided battery sheet, and the back sheet is a transparent back sheet.

The solar cell assembly using the split junction box for solar modules of the present invention can reduce the hot spot effect caused by the shielding of the junction box and reduce the heat transfer from the junction box to the assembly, thereby improving the efficiency of the solar cell assembly; at the same time , for double-sided battery modules, it can completely prevent the junction box from blocking the back of the battery sheet without changing the solar battery module itself, which saves the cost of the module and improves the reliability of the solar module.

Description of drawings

Fig. 1 is the structural representation of the first wire box of the present invention;

Fig. 2 is the structural representation of the intermediate line box of the present invention;

Fig. 3 is the structural representation of the second line box of the present invention;

Fig. 4 is the structural schematic diagram of solar cell assembly of the present invention;

Among them, 1 is the box body, 2 is the bypass diode, 3 is the terminal, 4 is the connection position, 5 is the first conductor, 5a is the first connection part, 6 is the second conductor, 6a is the second connection part , 10 is the first wire box, 20 is the middle wire box, 30 is the second wire box; 100 is the solar cell module, 101 is the double-sided cell, 102 is the bus bar, and 103 is the lead wire of the module.

detailed description

In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings, and the parts in the present invention that are the same as those of the prior art will refer to the prior art.

Example 1:

As shown in Figures 1-3, the split junction box for solar modules of the present invention includes a first junction box 10, an intermediate junction box 20, and a second junction box 30 that are independent of each other, and the intermediate junction box 20 is arranged on the first junction box. Between the box 10 and the second wire box 30, the first wire box 10 is connected to the negative pole of the photovoltaic connector, and the second wire box 30 is connected to the positive pole of the photovoltaic connector. Each wire box includes a box body 1 and a box cover that can close the box body. The box body 1 of the cable box is respectively provided with a bypass diode 2, a terminal 3 for connecting the lead wire of the component, and a first conductor 5 and a second conductor 6 connecting the bypass diode and the terminal 3. Two connection positions 4 distributed laterally are formed between the first conductor 5 and the second conductor 6 so that the bypass diode 2 and the terminal post 3 are arranged side by side. Specifically, the two ends of the first conductor 5 are bent to form two first connecting parts 5a parallel to the second conductor 6, and the second conductor 6 is located between the two first connecting parts 5a of the first conductor. Two second connection parts 6a connected to the first connection part 5a are formed on the second conductor 6, so that the two first connection parts 5a and the second conductor 6 are respectively formed between the two first connection parts 5a and the second conductor 6. Connect bit 4.

In this embodiment, the first conductor 5 and the second conductor 6 are copper-based; there is only one intermediate wire box 20 .

Of course, in other embodiments, other conductive materials may also be used for the conductor; the second conductor may also be disposed on one side of the first conductor, that is, located outside the two first connecting parts.

In the present invention, the way in which the bypass diodes and the binding posts connected to the lead wires are arranged up and down in the prior art is changed to horizontal arrangement of the diodes and the binding posts side by side. The diode is connected to the terminal through the special design of the conductor bending back, so that the diode can be arranged on one side of the terminal to achieve the purpose of reducing the longitudinal length of the terminal box.

Example 2:

As shown in Figure 4, another aspect of the present invention provides a solar cell module 100 using the junction box above. In this embodiment, the solar module is a double-sided solar module, including several double-sided solar cells 101, An upper layer of glass and a lower layer of transparent backplane or glass. The double-sided battery sheets 101 are divided into groups longitudinally. In this embodiment, each module is divided into 6 groups, and each group includes 10 double-sided battery sheets 101. Interconnection bars and bus bars are used between each double-sided battery sheet 101. 102 is connected and connected to the terminal 3 of the split junction box for solar modules through the module lead-out wire 103, which can be welded or clamped, and every two groups of cells are connected to a junction box. Specifically, the first and second groups of double-sided cells are connected to the first junction box 10, the third and fourth groups of double-sided cells are connected to the intermediate junction box 20, and the fifth and sixth groups of double-sided cells are connected to The second wire box 30 . The first wire box 10 is connected to the negative pole of the photovoltaic connector, and the second wire box 30 is connected to the positive pole of the photovoltaic connector.

Applied on double-sided solar modules, since the junction box becomes smaller, cells can be completely avoided. Since the output current value is determined by the cell with the smallest current value when the module generates power, when the cell is covered by the wire box, the current of the cell will decrease proportionally according to the shielding area, and the shielding area of a common split wire box is usually 15 square centimeter, each cell is about 7 square centimeters, and the area covered by 156 cells is about 3%, that is, the power generation of one side of the module is reduced by about 3%. This dissipates heat, which also reduces power to the components. By adopting the flat and elongated junction box provided by the present invention, the problem of battery slice shading can be completely solved without making major changes to the component design itself.

Of course, the present invention also has other implementation modes. The above-listed are only preferred embodiments of the present invention, and are not used to limit the implementation scope of the present invention. All equivalent changes and modifications made according to the content of the patent scope of the present application, All should be the technical scope of the present invention.

Claims (8)

1. A split junction box for solar modules, comprising a first junction box (10), an intermediate junction box (20) and a second junction box (30) independent of each other, and the intermediate junction box (20) is arranged on the first junction box Between the wire box (10) and the second wire box (30), the first wire box (10) is connected to the negative pole of the photovoltaic connector, and the second wire box (30) is connected to the positive pole of the photovoltaic connector. Each wire box includes a box body (1) and a box cover that can close the box body, which is characterized in that: in the box body (1) of each line box, a bypass diode (2), a terminal (3) for connecting the lead wire of the component, and a bypass diode (3) are respectively arranged. Two conductors of the bypass diode and the terminal (3), and two connection positions (4) distributed laterally are formed between the two conductors so that the bypass diode (2) and the terminal (3) are horizontally arranged side by side. 2. The split junction box for solar modules according to claim 1, characterized in that: the two conductors are the first conductor (5) and the second conductor (6), the first conductor (5) ) are bent to form two first connecting parts (5a) parallel to the second conductor (6), and are respectively formed between the two first connecting parts (5a) and the second conductor (6). The two connection bits (4). 3. The split junction box for solar modules according to claim 2, characterized in that: the second conductor (6) is located between the two first connecting parts (5a) of the first conductor. 4. The split junction box for solar modules according to claim 2, characterized in that: two second connecting parts (5a) respectively connected to the two first connecting parts (5a) are formed on the second conductor (6). Connecting part (6a). 5 . The split junction box for solar modules according to claim 1 , wherein the electrical conductor is copper-based. 6 . 6. The split junction box for solar modules according to claim 1, characterized in that there are one or more intermediate junction boxes (20). 7. A solar cell assembly (100) using a split-type junction box for solar modules according to any one of claims 1-6, comprising a plurality of battery sheets (101), upper glass and a back plate, and interconnecting strips between the battery sheets and the bus bar (102) and connected to the terminal (3) of the split junction box for the solar module through the component lead-out line (103). 8. The solar cell module (100) according to Claim 7, characterized in that: the cell sheet (101) is a double-sided cell sheet, and the back sheet is a transparent back sheet.