CN110034203A - A kind of bridging arrangement and solar components of solar battery sheet - Google Patents

Abstract

The invention relates to the technical field of solar modules, in particular to a solar cell overlap structure and a solar module. The solar cell overlap structure includes at least two solar cells, an adhesive and a welding tape. The ends of each of the solar cell sheets are superimposed on each other, and an adhesive is provided in the superimposed area, and the adhesive acts as a connection; one end of the welding tape is arranged on the front surface of the solar cell sheet, and the The other end of the welding tape is arranged on the back surface of the other solar cell sheet, and the welding tape passes through the overlapping area. The invention can eliminate the problem of stress caused by welding between two superimposed solar cells and the problem of open circuit caused by bonding, the welding tape and the adhesive interact with each other, learn from each other's strengths and make up for the shortcomings of each other, so that the superimposed area is not only better connected but also A good conduction state can be maintained.

Description

A solar cell overlapping structure and solar module

technical field

The invention relates to the technical field of solar modules, in particular to a lap joint structure of solar cells and a solar module.

Background technique

The solar shingled module is a popular high-efficiency module in the industry. Different from the traditional packaging process, the solar shingled module is to slice the cells, connect the cells into a battery string through a special conductive adhesive, and then install the solar cells in the solar cell. The busbars or back electrodes at the edges of both ends of the battery string are welded with a small amount of welding tape, and then welded by the bus bar and the lead-out welding tape. This module closely arranges the solar cells in a series-parallel structure. There is no gap between the cells, which reduces the internal loss caused by the interconnection of the cells; and more than 13% more cells can be placed in the same module area than conventional modules, which greatly increases the photoelectric conversion power of the module.

The two adjacent battery slices are overlapped with each other and connected by conductive adhesive. If the two battery slices are damaged or cracked, the battery string will be broken as a whole, which will have a great impact on the power of the module. After the two adjacent battery slices overlap each other, pass the welding tape. Connection, although it can solve the problem of disconnection of the battery string caused by the breakage and cracking of the battery slices, but due to the existence of the welding tape at the overlap of the battery slices, the welding tape has a certain thickness, so during the lamination process of the module, due to Ribbon stress can cause cracks or breakage of cells.

SUMMARY OF THE INVENTION

In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an overlapping structure for solar cell sheets to solve the above-mentioned problems in the background art.

A first aspect, the technical solution provided by the present invention: a lap joint structure of a solar cell, comprising at least two solar cells, a welding tape and an adhesive, and the ends of two adjacent solar cells are superimposed on each other , an adhesive is arranged in the superimposed area, and the adhesive acts as a connection;

One end of the welding strip is arranged on the front side of one of the solar cell sheets, and the other end of the welding strip is arranged on the back side of the other solar cell sheet, and the welding strip passes through the overlapping area.

Preferably, the solar cell sheet is cut in a direction perpendicular to the busbar.

Preferably, the length of the short side of the overlapping region is 0.3-1 mm.

Preferably, the adhesives are arranged at intervals and distributed along the long side of the overlapping area.

Preferably, the welding tape passes through the middle of two adjacent adhesives.

Preferably, two lateral electrodes are also included, one of the lateral electrodes is disposed on the front side of the solar cell sheet, and the other lateral electrode is disposed on the backside of the solar cell sheet.

Preferably, the thickness of the adhesive is set to be 0.15-0.2 mm.

Preferably, the adhesive includes hot melt adhesive, solder paste and conductive adhesive.

In the second aspect, the technical solution provided by the present invention includes a back plate and a solar cell sheet, and a plurality of the solar cell sheets are formed according to any one of the overlapping structures in the first embodiment. The shingled solar cell string.

The invention can eliminate the problem of stress caused by welding between two superimposed solar cells and the problem of open circuit caused by bonding, the welding tape and the adhesive interact with each other, learn from each other's strengths and make up for the shortcomings of each other, so that the superimposed area is not only better connected but also A good conduction state can be maintained.

Description of drawings

Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is a kind of solar cell overlapping structure schematic diagram of the present invention;

Fig. 2 is the A-direction schematic diagram of Fig. 1;

Fig. 3 is the schematic diagram of the busbar of the solar cell of the present invention;

4 is a schematic diagram of another solar cell overlap structure of the present invention;

FIG. 5 is a schematic diagram of the direction B in FIG. 4 .

In the figure: 1. Solar cell, 11. Solar cell, 12. Solar cell;

2. Welding strip, 21, Welding strip, 22, Welding strip;

3. Adhesive, 31, Adhesive, 32, Adhesive, 33, Adhesive;

41. Transverse electrode, 42. Transverse electrode.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the related invention, but not to limit the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. In addition, it should be noted that, for the convenience of description, only the parts related to the invention are shown in the drawings.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; it can also be a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or an internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In addition, it should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

Example 1

Referring to FIG. 1 , a lap joint structure of a solar cell includes at least two solar cells 1 , a welding tape 2 and an adhesive 3 . The ends of two adjacent solar cells 1 are superimposed on each other, and are arranged in the superimposed area. Adhesive 3, the adhesive 3 acts as a connection;

One end of the welding tape 2 is arranged on the front surface of one solar cell 1 , the other end of the soldering tape 2 is arranged on the back surface of another solar cell 1 , and the soldering tape 2 passes through the overlapping area.

Referring to FIG. 2 , the solar cell sheet 11 and the solar cell sheet 12 are overlapped, and one end of the solar cell sheet 11 and one end of the solar cell sheet 12 overlap each other. An adhesive 3 is arranged in the overlapping area. The adhesive 3 is used to fix and connect one end of the solar cell 11 and one end of the solar cell 12, and one end of the welding tape 2 is set on the front of the solar cell 12. The other end of the strip 2 is arranged on the back of the solar cell 11, and the welding strip 2 passes through the overlapping area of the solar cell 11 and the solar cell 12. The welding strip 2 not only connects the solar cell 11 and the solar cell 12 but also connects the two. Each solar cell is in a conducting state to ensure the smooth passage of current.

The invention can eliminate the problem of stress caused by welding between two superimposed solar cells and the problem of open circuit caused by bonding, the welding tape and the adhesive interact with each other, learn from each other's strengths and make up for the shortcomings of each other, so that the superimposed area is not only better connected but also A good conduction state can be maintained.

Referring to FIG. 3 , in a preferred implementation of this embodiment, a plurality of busbars are disposed on the front surface of the solar cell sheet, and the plurality of busbars are parallel to each other. The solar cell sheet is cut in the direction perpendicular to the busbar, and the solar cell sheet is divided into a plurality of small quadrilateral solar cell sheets. Each small piece of solar cell has multiple busbars, and one end of one small piece of solar cell is superimposed with one end of another small piece of solar cell, and the overlapping area is a quadrilateral. The long-side outline of the overlapping area is perpendicular to the plurality of busbar lines. The whole solar cell is cut into a plurality of small pieces for superposition, which is convenient to adjust the overall size and power of the solar module.

Referring to FIG. 1 , in a preferred implementation of this embodiment, the length of the short side of the superimposed area of the solar cell 11 and the solar cell 12 is 0.3-1 mm, which reduces the number of two solar cells in the superimposed area of the welding tape 2 pair. 1. The influence of welding stress reduces the risk of cracking or breakage of solar cells, and also increases the light-receiving surface and improves the power generation of solar modules.

In a preferred implementation of this embodiment, the adhesives are arranged in the overlapping area at intervals, and are distributed along the long side of the overlapping area, and the welding tape passes through the middle of two adjacent adhesives. The ingenious arrangement structure of the adhesive and the welding tape can more effectively connect the two adjacent overlapping solar cells, and at the same time overcome the problem of disconnection and cracking of the solar cells connected separately, and promote the better work of the cell string.

Referring to FIGS. 1 and 2 , in this embodiment, on the back of one end of the solar cell sheet 11 , the adhesive 31 , the adhesive 32 and the adhesive 33 are applied in the form of strips. The adhesive 31 , the adhesive The connecting objects 32 and the bonding objects 33 are both arranged between the bus bars and are distributed at intervals. The front side of one end of the solar cell sheet 12 is firmly attached to the adhesive 3 on the back of the solar cell sheet 11, so that the overlapping area of the solar cell sheet 11 and the solar cell sheet 12 can effectively connect the two solar cell sheets 1. .

One end of the welding tape 21 is set on the front side of the solar cell 12 - a busbar, and the other end of the welding tape 21 is set on the back of the solar cell 11 . The soldering tape 21 passes between the adhesives 31 and 32 , and the installation direction of the soldering tape 21 is perpendicular to the installation directions of the adhesives 31 and 32 .

The welding strip 22 is arranged in parallel with the welding strip 21 . The welding tape 22 passes between the adhesives 32 and 33 , and the installation direction of the welding tape 22 is perpendicular to the installation directions of the adhesives 32 and 33 .

It should be noted that the adhesive is hot-melt adhesive, and the hot-melt adhesive is evenly spread on the lower surface of the solar cell sheet 11 , and the thickness of the coating layer is greater than 0.15 mm and less than 0.2 mm. The thickness of the coating layer is slightly larger than the thickness of the welding tape, so that there is a gap between the welding tape and the battery plate, which is beneficial to release the welding heat and prevent the cracking or damage of the battery sheet.

Referring to FIG. 4 and FIG. 5 , in a preferred implementation of this embodiment, a lateral electrode 41 is provided on the front side of one end of the solar cell sheet 11 , and the lateral electrode 41 is perpendicular to the busbars on the solar cell sheet 11 . A lateral electrode 42 is provided on the back of the other end of the solar cell 11 , and the lateral electrode 42 is perpendicular to the busbars on the solar cell 11 .

A transverse electrode 41 is provided on the front side of one end of the solar cell sheet 12, the transverse electrode 41 is perpendicular to the busbar of the solar cell sheet 12, and a transverse electrode 42 is provided on the back of the other end of the solar cell sheet 12, and the transverse electrode 42 is perpendicular to the The busbar of the solar cell 12 .

On the lateral electrodes 41 of the solar cell sheet 12, the adhesives 31, 32 and 33 are applied in strips, and the adhesives 31, 32 and 33 are distributed at intervals. The lateral electrodes 42 of the solar cell sheet 11 are attached to the lateral electrodes 41 of the solar cell sheet 12 , and the overlapping areas of the solar cell sheet 11 and the solar cell sheet 12 are connected together by the adhesive 3 .

One end of the welding tape 21 is set on a busbar on the front surface of the solar cell 12 , and the other end of the welding tape is set on the back of the solar cell 11 . The soldering tape 21 passes through the middle of the adhesive 31 and the adhesive 32 , and the installation direction of the soldering tape 21 is perpendicular to the installation direction of the adhesive 31 and the adhesive 32 .

One end of the welding tape 22 is set on the other busbar on the front side of the solar cell 12 , and the other end of the welding tape 2 is set on the back of the solar cell 11 . The soldering tape 22 passes through the middle of the adhesive 32 and the adhesive 33 , and the arrangement direction of the soldering tape 22 is perpendicular to the arrangement direction of the adhesive 32 and the adhesive 33 .

The adhesive 31, the adhesive 32 and the adhesive 33 not only play the role of connection but also conduct electricity, which are the same as the functions of the welding tape 21 and the welding tape 22. The solar cells 1 are better connected together and are always on.

It should be noted that the adhesive 31 , the adhesive 32 and the adhesive 33 are all conductive glue or solder paste, which are evenly spread on the lateral electrodes 42 , and the thickness of the coating layer is greater than 0.15 mm and less than 0.2 mm.

Embodiment 2

A solar module includes a backsheet and a battery sheet, and the backsheet is located on the back of the battery sheet. The battery string is formed by shingled connection of an even number of battery slices, and the shingled connection of the battery slices is conductively connected, and the specific connection method is a seamless connection such as conductive glue and welding tape.

The battery strings are distributed in parallel on the backplane, and the number of battery sheets in each battery string is the same, which can ensure that the battery strings in the module are arranged in a regular rectangle. The head of the battery string is provided with a bus bar, which is respectively connected with the battery slices at the head of each battery string through a welding tape.

The soldering tape is used for the electrical connection between the battery string and the bus bar. When soldering, the soldering iron tip needs to directly contact the soldering tape, and the soldering tape is heated to melt the tin layer on the surface. Above the battery strings and bus bars.

A grid line is arranged on the cell sheet for current collection of the solar cell. The grid lines of the cell are completed by printing, the grid lines are solid grid lines, and the lower surface of the welding tape is in contact with the upper surface of the solid grid lines.

The above embodiments only illustrate the technical solutions of the invention rather than limit them. Although the present invention is described in detail with reference to the various embodiments, those of ordinary skill in the art should understand that the technical solutions described in the foregoing embodiments can still be used. Modifications are made, or some or all of the technical features are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. A lap joint structure of a solar cell, characterized in that it comprises at least two solar cells, a welding tape and an adhesive, and the ends of the two adjacent solar cells are superimposed on each other, and in the superimposed An adhesive is arranged in the area, and the adhesive acts as a connection; One end of the welding strip is arranged on the front side of one of the solar cell sheets, and the other end of the welding strip is arranged on the back side of the other solar cell sheet, and the welding strip passes through the overlapping area. 2 . The lap joint structure according to claim 1 , wherein the solar cell sheet is cut in a direction perpendicular to the busbar. 3 . 3 . The overlapping structure according to claim 1 , wherein the length of the short side of the overlapping area is 0.3-1 mm. 4 . 4 . The lap joint structure according to claim 1 , wherein the adhesives are arranged at intervals and distributed along the long side of the overlapping area. 5 . 5 . The lap joint structure according to claim 4 , wherein the welding tape passes through the middle of two adjacent adhesives. 6 . 6 . The lap joint structure according to claim 1 , further comprising two lateral electrodes, one of the lateral electrodes is disposed on the front side of the solar cell sheet, and the other lateral electrode is disposed on the solar cell sheet. 7 . the back of the battery. 7 . The lap joint structure according to claim 1 , wherein the thickness of the adhesive is 0.15-0.2 mm. 8 . 8 . The lap joint structure according to claim 1 , wherein the adhesive comprises hot melt adhesive, solder paste and conductive adhesive. 9 . 9 . A solar module, characterized in that it comprises a back sheet and solar cell sheets, and a plurality of said solar cell sheets are shingled solar cell strings formed according to the overlapping structure of any one of claims 1 to 8 .