CN212934637U

CN212934637U - Shingle assembly

Info

Publication number: CN212934637U
Application number: CN202021249921.9U
Authority: CN
Inventors: 陈军; 李华; 刘继宇
Original assignee: Taizhou Lerri Solar Technology Co Ltd
Current assignee: Taizhou Longi Solar Technology Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-04-09
Anticipated expiration: 2030-06-30

Abstract

The utility model provides a fold tile subassembly relates to the photovoltaic technology field. The laminated tile assembly comprises at least two back contact solar cells which are arranged in an overlapped mode; the overlapping region of two overlapping back contact solar cells includes a non-electrode region where no electrode is disposed. The overlapping region includes a non-electrode region where no electrode is disposed, and in the case of connecting the back-contact solar cells using a lamination method, a decrease in photoelectric conversion efficiency of the back-contact solar cells due to dark current generated in the overlapping region is reduced, and the output power of the stack assembly can be improved. Meanwhile, since the electrodes in the overlap region are generally not connected in series to the conductive layer, or the current loss is large in the process of being connected in series to the conductive layer, the overlap region includes a non-electrode region where no electrode is disposed, and the output loss from the electrode resistance can be reduced.

Description

Shingle assembly

Technical Field

The utility model relates to the field of photovoltaic technology, especially, relate to a stack tile subassembly.

Background

The back contact solar cell has no electrode on the light facing surface, so that the shading is reduced, the short circuit current of the cell is increased, and the back contact solar cell is more attractive and wide in application.

A part of each back contact solar cell is overlapped with each other to form a laminated assembly, so that the power output of the assembly can be improved, and the appearance is more attractive.

However, the current overlap region of the shingled module of the back contact solar cell has large dark current, which results in the reduction of the output power of the module.

SUMMERY OF THE UTILITY MODEL

The utility model provides a stack tile subassembly aims at solving the overlapping region of the stack tile subassembly of current back of the body contact solar cell and has great dark current, leads to the problem that the output of subassembly reduces.

According to a first aspect of the present invention, there is provided a laminated tile assembly comprising at least two back contact solar cells arranged in an overlapping manner;

the overlapping region of two overlapping back contact solar cells includes a non-electrode region where no electrode is disposed.

The embodiment of the present invention provides an embodiment, the overlapping region includes a non-electrode region where no electrode is disposed, and under the condition that the back contact solar cell is connected using the lamination mode, the reduction of the photoelectric conversion efficiency of the back contact solar cell caused by the dark current generated in the overlapping region is reduced, and the output power of the laminated assembly can be improved. Meanwhile, since the electrodes in the overlap region are generally not connected in series to the conductive layer, or the current loss is large in the process of being connected in series to the conductive layer, the overlap region includes a non-electrode region where no electrode is disposed, and the output loss from the electrode resistance can be reduced.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 shows a schematic structural view of a shingle assembly in an embodiment of the present invention;

fig. 2 shows a schematic structural diagram of a first overlapping back contact solar cell according to an embodiment of the present invention;

fig. 3 shows a schematic structural diagram of a back contact solar cell in a second overlapping arrangement according to an embodiment of the present invention.

Description of the figure numbering:

1-a conductive layer, 21-a first electrical connector, 22-a second electrical connector, 3-a back contact solar cell, 31-a first electrode, 32-a second electrode, 36-a short side, 37-a chamfer, 311-a first connection electrode, 312-a first fine grid line, 321-a second connection electrode, 322-a second fine grid line, 4-an insulating layer, 41-an opening, 5-a cover plate, 6-a back plate, 7-a sealing layer, 8-a pressure-proof pad, 9-an adhesive layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the embodiment of the present invention, referring to fig. 1, fig. 1 shows a schematic structural diagram of a laminated tile assembly in the embodiment of the present invention. In the stack module, adjacent 2 back contact solar cells 3 are overlapped. The size of the overlapping area is not particularly limited.

The overlapped region of two overlapped back-contact solar cells comprises a non-electrode region without an electrode, and because the electrode of the overlapped region cannot be generally connected to the conductive layer in series or the current loss is large in the process of being connected to the conductive layer in series, the overlapped region comprises the non-electrode region without the electrode, the output loss from the electrode resistance can be reduced. In addition, in the case of connecting the back contact solar cells using the lamination method, a decrease in photoelectric conversion efficiency of the back contact solar cells due to dark current generated in the overlapping region is reduced, and the output power of the stack module can be improved.

In the overlapping region, the first electrode or the second electrode in the electrode region of the electrode is provided and is formed adjacent to the non-electrode region.

Optionally, the area of the non-electrode region of the overlapping region of the two overlapped back-contact solar cells is 50% -90% of the area of the overlapping region, and further, no electrode is disposed in most of the overlapping region, so that the output loss from the electrode resistor can be further reduced. In addition, in the case of connecting the back contact solar cells using the lamination method, the decrease in photoelectric conversion efficiency of the back contact solar cells due to dark current generated in the overlapping region is further reduced, and the output power of the laminated module can be improved.

Fig. 2 shows a schematic structural diagram of a back contact solar cell in a first overlapping arrangement according to an embodiment of the present invention. Fig. 2 may be a bottom view looking from the backlight face toward the light-facing face. Referring to fig. 2, optionally, the back contact solar cell 3 includes a short side 36 parallel to the serial connection direction of each back contact solar cell or parallel to a cell string formed by each back contact solar cell, and in the direction parallel to the short side 36, a dimension L1 of an overlapping region of two back contact solar cells arranged in an overlapping manner is 5% -50% of a length L2 of the short side 36, and since an electrode of the overlapping region cannot be generally connected to the conductive layer in series or a current loss is large in the process of being connected to the conductive layer in series, the size of the overlapping region is such that the area of a remaining non-overlapping region is large, and further, the number of electrodes connected to the conductive layer 1 in series is large, thereby reducing the problem that current cannot be collected due to overlapping.

As shown in fig. 2, the first electrode 31 is composed of a first connection electrode 311 and a first thin gate line 312, and the first connection electrode 311 is connected to the first thin gate line 312. The first electrical connector conductively connects the first connection electrode 311 of the back contact solar cell. The first connection electrode 311 is parallel to the series direction of the respective back contact solar cells or parallel to the cell string formed by the respective back contact solar cells, and the short side direction is parallel to the first connection electrode 311.

Optionally, in a direction parallel to the short side of the back contact solar cell, the size of the overlapping area of the two back contact solar cells arranged in an overlapping manner is 0.3mm to 3 mm. As shown in fig. 1, the dimension a of the overlapping area of two back-contact solar cells 3 arranged to overlap is 0.3mm to 3mm in a direction parallel to the short sides of the back-contact solar cells 3. The overlapping area with the size not only enables the overlapping arrangement of the two back contact batteries to be reliable, but also enables the electrodes of the overlapping area to be generally incapable of being connected to the conducting layer 1 in series, or the current loss is large in the process of being connected to the conducting layer 1 in series, the size of the overlapping area enables the area of the remaining non-overlapping area to be large, and then the number of the electrodes connected to the conducting layer 1 in series is large, so that the problem that the current cannot be collected due to overlapping is solved.

It should be noted that the area of the overlapped region of the two overlapped back-contact solar cells may be determined by the length L3 of the long side of the back-contact solar cell and the size L1 of the overlapped region of the two overlapped back-contact solar cells in the direction parallel to the short side 36. In the case where the electrodes are provided in the overlapping region, the area of the overlapping region is smaller, so that the problem that the current cannot be collected due to the overlapping is smaller.

Optionally, referring to fig. 1, the stack assembly further includes: the pressure-proof pad 8 is positioned in the overlapped region of the two overlapped back-contact solar cells, the Young modulus of the pressure-proof pad 8 is larger than 5Mpa, the pressure-proof pad 8 can absorb stress, hidden cracks are reduced, and the reliability of the assembly is improved.

The shape of the pressure-proof pad 8 is not particularly limited, and for example, the shape of the pressure-proof pad 8 may be circular or the like. The pressure-proof pad 8 may be a continuous whole strip or a discontinuous strip, which is not limited in the embodiment of the present invention.

Optionally, the material of the pressure-proof pad is selected from: the pressure-proof pad is made of at least one of epoxy resin, acrylate, silicone, imide, bismaleimide, siloxane, vinyl acetate, polyolefin, polyimide, acrylate, polyurethane, cyanoacrylate and phenolic resin, and has a good stress absorption effect and low cost. Meanwhile, the pressure-proof pad made of the material has certain bonding performance, can bond two back-contact solar cells which are mutually overlapped, and improves the overlapping reliability.

Optionally, the pressure-proof pad is an adhesive tape, the adhesive tape includes a backing layer, one side of the backing layer is coated with an adhesive, and the backing layer is made of a material selected from: the pressure-proof pad made of the material is one of paper, polymer film, cloth and metal foil, and has good stress absorption effect and low cost. Meanwhile, the pressure-proof pad made of the material has certain bonding performance, can bond two back-contact solar cells which are mutually overlapped, and improves the overlapping reliability.

It should be noted that whether the pressure-proof pad is conductive or not is not particularly limited. For example, the pressure-proof pad can be non-conductive, and thus the cost is lower.

Optionally, referring to fig. 1, the stack assembly further includes: the adhesive layer 9 is positioned in the overlapping area of the two overlapped back-contact solar cells, and the adhesive layer 9 can play a role in adhering the two back-contact solar cells which are overlapped with each other, so that the overlapping reliability is improved. The material of the adhesive layer 9 is not particularly limited.

Whether or not the adhesive layer is conductive is not particularly limited. For example, the bonding layer can be non-conductive, thereby reducing the cost.

Alternatively, as shown in fig. 2, one end of the back contact solar cell 3 is provided with a chamfer 37 and the other end is not provided with a chamfer. Referring to fig. 3, fig. 3 is a schematic structural diagram of a back contact solar cell in a second overlapping arrangement according to an embodiment of the present invention. Fig. 3 may be a view of the overlapping back contact cells of fig. 2 looking from the light-facing side to the backlight side. In the laminated tile assembly, one back contact solar cell 3 is not provided with the one end of the chamfer, the overlapping is arranged on the one end of the other back contact solar cell 3 provided with the chamfer 37, furthermore, the one end provided with the chamfer is pressed below by the one end not provided with the chamfer, and the chamfer can not be seen from the light facing surface, so that the attractiveness of the laminated tile assembly can be improved. In fig. 311 is an opening in the insulating layer.

Optionally, referring to fig. 1, the stack assembly further includes: a cover plate 5 positioned on the light-facing side of the back-contact solar cell 3, and a back plate 6 positioned on the backlight side of the back-contact solar cell 3. A sealing layer 7 is also provided around the back contact solar cell 3 between the cover sheet 5 and the back sheet 6. The seal material of the seal layer 7 is selected from: the sealing layer of the material can play a role in absorbing stress well, can reduce subfissure and improve the reliability of the assembly.

The sealing layer 7 may be shaped to fit between the cover sheet 5 and the back sheet 6 and to surround the back contact solar cell 3, and may be in the form of a sheet. In the embodiment of the present invention, this is not particularly limited.

The cover plate 5 positioned on the light-facing surface of the back contact solar cell 3 and the sealing layer 7 positioned on the light-facing surface of the back contact solar cell 3 have light-transmitting properties. The material of the sealing layer 7 may be liquid or solid, the sealing material may be added separately, may be flowed to the overlapping area at the time of lamination, seals the shingle assembly by curing or laminating the sealing agent, and bonds the back contact solar cell between the back sheet and the transparent cover sheet to form a laminate. The final laminate may be installed along with a frame to produce a shingle assembly. The encapsulant for the stack assembly can provide electrical insulation, reduce moisture ingress, and protect the stack assembly from mechanical stress and/or corrosion.

Optionally, the shingle assembly may further include a front antireflection layer on the light-facing side of the cover plate to reduce light reflection. The light facing surface and/or the backlight surface of the cover plate can be provided with light trapping structures, so that the optical path is increased. For example, the light facing and/or the back-lighting surface of the cover plate may be machined to be convex-concave in order to direct more light into the photovoltaic module.

Alternatively, referring to fig. 1, the electrical connector is divided into: a first electrical connector 21 and a second electrical connector 22. The first electrical connector 21 is used for electrically connecting the first electrode 31 in the back contact solar cell 3 region and the conductive circuit in the conductive layer 1. For example, the first electrical connector 21 conductively connects the first electrode 31 of the non-overlapping region of one of the two overlapping back-contact solar cells 3 and the conductive line in the conductive layer 1. As in fig. 1, the left back-contact solar cell 3 is conductively connected to the conductive layer 1 via a first electrical connector 21 and a first electrode 31. The second electrical connector 21 is used for electrically connecting the second electrode 32 of the back contact solar cell 3 and the conductive line in the conductive layer 1. For example, the second electrical connector 21 conductively connects the second electrode 32 of the non-overlapping region of the other back-contact solar cell 3 of the two back-contact solar cells 3 that are arranged to overlap, and the conductive line in the conductive layer 1. As in fig. 1, the right back-contact solar cell 3 is conductively connected to the conductive layer 1 via the second electrical connector 22 and the second electrode 32. The first electrode 31 and the second electrode 32 have opposite polarities. If the first electrode 31 is a positive electrode, the second electrode 32 may be a negative electrode. Furthermore, the 2 back contact solar cells 3 on the left and right are connected in series to the conductive layer 1 through the first electrical connector 21 and the second electrical connector 22, so that a cell string with overlapping arrangement is formed, and the process is simple. Meanwhile, the conductive connector 2 protruding out of the conductive layer 1 can play a certain supporting role on external force, so that the connection strength can be improved, the risk of breakage of a battery or a component is reduced, and the reliability of the component is improved.

The first electrical connector is used for electrically connecting a first electrode of one back contact cell, the second electrical connector is used for electrically connecting a second electrode of the same back contact cell, and the polarities of the first electrode and the second electrode are opposite. The first electric connector is also used for electrically connecting the first electrode of one of the two overlapped back contact solar cells, and the second electric connector is also used for electrically connecting the second electrode of the other of the two overlapped back contact solar cells.

The pattern of conducting circuit sets up to, makes electrically conductive interconnection can be with a plurality of back contact solar cell series connection, and then does benefit to the shingle subassembly that forms back contact solar cell.

Note that an insulating gap is present between the first electrical connector 21 and the second electrical connector 22. The shape of the surface of the first electrical connector 21 facing the first electrode 31 matches the shape of the backlight surface of the first electrode 31 in the back contact solar cell 3 arranged in an overlapping manner, and thus the contact area is large, so as to ensure good conductivity. The shape of the surface of the second electrical connector 22 facing the second electrode 32 matches the shape of the backlight surface of the second electrode 32 in the back contact solar cell 3 arranged in an overlapping manner, and thus the contact area is large, so as to ensure good conductivity.

The electrodes of the back contact solar cell are arranged on the backlight surface, and the light facing surface is used for collecting sunlight radiation. The backlight surface of the back contact solar cell can also collect diffused light, and double-sided sunlight collection can be realized. In the overlapping process, the backlight surface of one back contact solar cell is overlapped and arranged on the light-facing surface of the other back contact solar cell. As shown with reference to fig. 1, the backlight surface of the left back-contact solar cell 3 is disposed to overlap the light-facing surface of the right back-contact solar cell 3.

In fig. 2, the first electrode 31 is composed of a first connection electrode 311 and first thin gate lines 312, the first thin gate lines 312 are in contact with first diffusion regions on the backlight surface of the semiconductor substrate, and the first connection electrode 311 is connected to the first thin gate lines 312. The second electrode 32 is composed of a second connection electrode 321 and a second thin gate line 322, the second thin gate line 322 is in contact with the second diffusion region on the backlight surface of the semiconductor substrate, and the second connection electrode 321 is connected to the second thin gate line 322. The first electrical connector may be electrically conductively connected to the first connection electrode 311, and the second electrical connector may be electrically conductively connected to the second connection electrode 321. The first diffusion region and the second diffusion region have opposite polarities.

The above-mentioned back contact solar cell can be the whole piece battery, or can be the burst battery of whole piece battery after the burst, in the embodiment of the utility model provides an, do not specifically limit to this. One whole battery can be divided into 2-10 divided batteries. The individual segmented cells may have substantially equal areas, substantially equal widths, lengths, etc. In the embodiment of the present invention, this is not particularly limited.

Each of the above electrical connectors protrudes from the conductive layer 1 and protrudes from the opening of the insulating layer 4, and then the first electrical connector 21 electrically connects the first electrode 31 of the back contact solar cell 3 and the conductive line in the conductive layer 1. The second electrical connector 22 electrically conductively connects the second electrode 32 of the back contact solar cell 3 and the conductive line in the conductive layer 1. Then, the positions of the openings 41 in the insulating layer 4 need to correspond to the positions of the first electrode and the second electrode on the back contact solar cell, respectively. For the same back contact solar cell, a first electric connector connected with a first electrode of the back contact solar cell and a second electric connector connected with the same back contact solar cell both extend out of the opening of the insulating layer 4, the polarities of the first electrode and the second electrode are opposite, the first electrode and the second electrode are further electrically isolated through the insulating layer 4 without the opening, and short circuit between the first electrode and the second electrode of the same back contact solar cell can be avoided. Meanwhile, the insulating layer 4 can play a certain supporting role on external force, so that the connection strength can be improved, the risk of breakage of the battery or the component is reduced, and the reliability of the component is improved.

The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, and all of them fall within the protection scope of the present invention.

Claims

1. A shingle assembly comprising at least two back contact solar cells in an overlapping arrangement;

2. The stack assembly of claim 1, wherein the area of the non-electrode region is 50-90% of the area of the overlap region.

3. The shingle assembly of claim 1, wherein the size of the overlap region of two overlapping back-contact solar cells is between 5% and 50% of the size of the short side.

4. A shingle assembly according to claim 3 wherein the size of the overlap area of two overlapping back-contact solar cells is between 0.3mm and 3mm in a direction parallel to the short sides.

5. A shingle assembly according to any of claims 1 to 3, further comprising: the pressure-proof pad is positioned in an overlapped area of the two overlapped back-contact solar cells;

the Young modulus of the pressure-proof pad is more than 5 Mpa.

6. A shingle assembly according to any of claims 1 to 3, further comprising: and the adhesive layer is positioned in the overlapped region of the two overlapped back contact solar cells.