WO2021072906A1

WO2021072906A1 - Photovoltaic assembly

Info

Publication number: WO2021072906A1
Application number: PCT/CN2019/119923
Authority: WO
Inventors: 郭志球; 陶武松; 李婷婷; 张延炎; 王路闯
Original assignee: 浙江晶科能源有限公司; 晶科能源有限公司
Priority date: 2019-10-16
Filing date: 2019-11-21
Publication date: 2021-04-22

Abstract

Disclosed is a photovoltaic assembly, comprising solar cell sheets and an interconnection strip for conducting two adjacent solar cell sheets, wherein at least one of the two adjacent solar cell sheets is provided with an avoidance groove for avoiding the interconnection strip. The avoidance groove for avoiding the interconnection strip is provided in the solar cell sheet. When two solar cell sheets are connected, edges of the two overlap each other, and the interconnection strip is located in the avoidance groove, such that the edges of the two solar cell sheets can be attached to each other. The upper solar cell sheet is supported by the lower solar cell sheet, and the supporting area between the two is increased, thus avoiding the phenomenon of stress concentration, such that hidden cracks being produced in the solar cell sheets is avoided, and the yield of the photovoltaic assembly is improved.

Description

A photovoltaic module

This application requires a Chinese patent application filed with the Chinese Patent Office, the application number is 201910983835.6, the invention name is "a photovoltaic module", the application number is 201921738818.8, and the utility model name is "a photovoltaic module" on October 16, 2019. Priority, the entire content of which is incorporated in this application by reference.

Technical field

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

Background technique

With the development of solar photovoltaic cell and module technology, the market demand for high-efficiency modules is becoming more and more urgent. In the current photovoltaic environment, how to increase the power generation per unit area is the focus of attention of photovoltaic companies. To increase the power generation per unit area, on the one hand, the power generation efficiency of photovoltaic cells can be improved, and on the other hand, the effective power generation area can be increased.

The photovoltaic module is composed of multiple cells, and the cells are connected in series through interconnection bars. The interconnection bars pass over one cell and enter under the next cell, and connect the cells in sequence. In order to eliminate the gap between the battery slices, the edges of the battery slices are usually arranged overlapping in the prior art, that is, the battery slices are alternately distributed above and below the interconnection bar, and the edges of the battery slices overlap. Because the interconnection bar itself has a certain diameter, the edges of two adjacent battery slices overlap, and the interconnection bar is located between the two, creating a gap between the edges of the two. Gravity, wind pressure, and other external pressures act on the surface of the cell to generate pressure on the surface of the cell, and the pressure at the location of the interconnection bar is concentrated, which may easily cause the cell to crack and reduce the yield of photovoltaic modules.

Therefore, how to avoid cell cracks is an expected technical problem.

Summary of the invention

The object of the present invention is to provide a photovoltaic module, the solar cells of which are provided with interconnecting strips located in the relief groove, so that the edges of two adjacent solar cells can be attached to each other without the support of interconnecting strips, thereby avoiding solar energy. The cell is cracked.

In order to achieve the above-mentioned object, the present invention provides a photovoltaic module, comprising solar cells and interconnecting bars for connecting two adjacent solar cells. At least one of the two adjacent solar cells is provided with The giving way slot for the interconnection bar to give way.

Preferably, the shape of the relief groove is U-shaped, and extends from the edge of the solar cell sheet to the inner side along the axial direction of the interconnecting bar for a predetermined length.

Preferably, the preset length is 1-20 mm, and the width of the relief groove is 0.1-20 mm.

Preferably, at least 5 of the solar cell sheets are connected in series to form a battery string.

Preferably, the length of the solar cell sheet is not less than 150mm, and the width is not less than 10mm.

Preferably, both ends of the solar cell sheet corresponding to the interconnection bar are provided with the relief grooves.

Preferably, the length of the interconnection bar is greater than the length of the solar cell sheet.

Preferably, a protective cover for protecting the interconnection bar is embedded in the relief groove.

The photovoltaic module provided by the present invention includes a solar cell and an interconnection bar for connecting two adjacent solar cells. At least one of the two adjacent solar cells is provided with the interconnection bar. Bit give way slot.

The solar cell sheet is provided with a recess for the interconnection bar. When two solar cells are connected, their edges overlap, and the interconnection bar is located in the relief slot, so the edges of the two solar cells can be attached to each other, and the upper solar cell is supported by the lower solar cell. The area of the intermediate support is increased to avoid stress concentration, thereby preventing the solar cell from cracking, and improving the yield of photovoltaic modules.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, without creative work, other drawings can be obtained according to the provided drawings.

Figure 1 is a schematic diagram of the structure of a photovoltaic module provided by the present invention;

Among them, the reference signs in Figure 1 are:

Solar cell 1, interconnection strip 2, and relief slot 3.

Detailed ways

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 a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Please refer to FIG. 1, which is a schematic diagram of the structure of the photovoltaic module provided by the present invention.

The photovoltaic module provided by the present invention, as shown in Figure 1, includes a solar cell 1 and an interconnection bar 2. The solar cell 1 is provided with a fine grid for collecting charges generated at various parts, and the interconnection bar 2 is vertical fine grid, Used to derive the charge collected by the fine grid. Two adjacent solar cells 1 in the length direction are connected in series by interconnecting bars 2 to form a battery string. Generally, the number of solar cells 1 in the battery string is greater than or equal to 5, and the solar cells 1 are alternately distributed above and above the interconnecting bars 2. Below. In order to increase the effective power generation area, the edges of adjacent solar cell sheets 1 will overlap each other, thereby eliminating the gap between the two. The interconnection bar 2 is located between the overlapping parts of the solar cell 1. In the prior art, the interconnection bar 2 occupies a certain height in the vertical direction, so that the edge of the solar cell 1 located above is supported by the interconnection bar 2, which results in the solar cell The edge of the sheet 1 is prone to stress concentration. In order to eliminate the space occupied by the interconnection bar 2 in the vertical direction, the solar cell sheet 1 is provided with a relief slot 3 located on the periphery of the intersection of the interconnection bar 2 and the solar cell sheet 1. The length of the relief slot 3 is longer than two solar cells The width of the overlapped portion of the cell 1. After the solar cell 1 is installed, the interconnection bar 2 enters the relief slot 3 before reaching the overlapped part of the two solar cells 1 to avoid the interconnection bar 2 from adhering to the edges of the upper and lower solar cell 1 to form an obstacle , Improve the contact area between the two and avoid the occurrence of stress concentration. Of course, the interconnection bar 2 and the thin grid can also extend in other directions, which is not limited here.

Optionally, the relief groove 3 is located on the side of the solar cell 1 intersecting with the interconnection bar 2, and the solar cell 1 is generally rectangular. In a specific implementation of the present application, a relief groove 3 is provided on one width side of the solar cell sheet 1 and no relief groove 3 is provided on the other side. When two solar cells 1 are connected, the width side with the relief groove 3 is connected to the width side without the relief groove 3, and the side without the relief groove 3 is usually overlapped with the relief groove 3 3 above the side. This embodiment can further increase the effective power generation area of the photovoltaic module.

In another specific embodiment of the present application, the two width sides of the solar cell 1 are provided with relief grooves 3, and there is no need to adjust the direction of the solar cell 1 when installing the photovoltaic module, which improves the installation efficiency of the photovoltaic module. .

Optionally, the shape of the relief groove 3 is U-shaped. As shown in FIG. 1, the relief groove 3 extends from the edge of the solar cell sheet 1 along the axial direction of the interconnection bar 2 to the inner side of the solar cell sheet 1 for a predetermined length. There are fine grids on the outer circumference of the relief groove 3 and between the relief groove 3 to ensure that the charge generated in the area between the relief grooves 3 can be effectively collected, thereby ensuring that the area between the relief grooves 3 is effectively used . The optional range of the preset length of the relief slot 3 is 1-20mm, and the optional range of the width of the relief slot 3 is 0.1-20mm. Of course, the user can also set the preset length and the width of the relief slot 3 according to needs, and can also choose other shapes of relief slots 3, such as rectangular, triangular, or trapezoidal.

In this embodiment, the solar cell 1 is provided with a relief groove 3, and the interconnection bar 2 is located in the relief groove 3 without occupying additional space in the vertical direction, so that the sides of the solar cell 1 can be attached to each other to avoid The occurrence of the stress concentration phenomenon avoids the problem of cracks in the solar cell 1.

Optionally, the length of the solar cell 1 is not less than 150 mm, the width is not less than 10 mm, and the length of the interconnection bar 2 is greater than or equal to the length of the solar cell 1. When the interconnection bar 2 is connected, no tensile stress is generated in its length direction, so the pressure on the overlapping part of the two solar cell sheets 1 is not increased, and the risk of the solar cell sheet 1 being cracked is reduced.

In addition, in order to further improve the ability of the solar cell 1 to withstand stress, a wedge-shaped bevel can be provided on one side edge of the relief groove 3, that is, the cross section of the edge of the solar cell 1 is wedge-shaped, so that it is above or above the edge of the solar cell 1 An inclined surface is generated below, and the inclined surfaces on opposite sides are respectively located on the upper surface and the lower surface of the solar cell sheet 1. When the two solar cells 1 are connected, the two wedge-shaped inclined surfaces are attached to each other, which further increases the contact area between the two solar cells 1 and reduces the pressure on the contact surface to prevent the solar cell 1 from cracking. In addition, in order to prevent the interconnection bar 2 from being corroded by rain, etc., a protective cover is also embedded in the relief groove 3. The protective cover can be made of thermosetting plastic and other materials. The protective cover is set above the interconnection bar 2 to prevent the interconnection bar 2 from growing. Rust causes an increase in electrical resistance.

In this embodiment, the length of the interconnection bar 2 is greater than or equal to the length of the solar cell 1, which prevents the stress generated by the interconnection bar 2 from being applied to the solar cell 1 after welding. At the same time, the edge of the solar cell 1 is provided with a wedge-shaped slope. If the interconnection bar 2 produces stress due to thermal expansion and contraction, the solar cell 1 can move along the wedge-shaped slope to avoid direct stress on the solar cell 1. This reduces the risk of the solar cell 1 cracking.

It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such existence between these entities. The actual relationship or order.

The photovoltaic module provided by the present invention has been described in detail above. Specific examples are used in this article to illustrate the principle and implementation of the present invention. The description of the above examples is only used to help understand the method and core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

A photovoltaic module, characterized in that it comprises a solar cell (1) and an interconnection bar (2) for conducting two adjacent solar cells (1), and two adjacent solar cells (1) At least one of 1) is provided with a concealment slot (3) for making way for the interconnection strip (2).
The photovoltaic module according to claim 1, wherein the shape of the relief groove (3) is U-shaped, and runs from the edge of the solar cell (1) along the axis of the interconnection bar (2). Extend the preset length to the inside.
The photovoltaic module according to claim 2, wherein the preset length is 1-20 mm, and the width of the relief groove (3) is 0.1-20 mm.
The photovoltaic module according to claim 1, wherein at least five solar cells (1) are connected in series to form a battery string.
The photovoltaic module according to claim 4, characterized in that the length of the solar cell (1) is not less than 150mm, and the width is not less than 10mm.
The photovoltaic module according to any one of claims 1 to 5, characterized in that the two ends of the solar cell (1) corresponding to the interconnection bar (2) are provided with the relief grooves (3).
The photovoltaic module according to any one of claims 1 to 5, characterized in that the length of the interconnection strip (2) is greater than the length of the solar cell (1).
The photovoltaic module according to any one of claims 1 to 5, characterized in that, a protective cover for protecting the interconnection bar (2) is embedded in the relief groove (3).