CN210897303U

CN210897303U - Solar cell and photovoltaic module with same

Info

Publication number: CN210897303U
Application number: CN201922419761.1U
Authority: CN
Inventors: 张春华; 吴泽民; 王焱; 王高昇; 黄浩; 衡阳
Original assignee: CSI Cells Co Ltd; CSI Solar Power Group Co Ltd
Current assignee: Canadian Solar Inc; CSI Cells Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-06-30
Anticipated expiration: 2029-12-27

Abstract

The utility model discloses a solar cell and have photovoltaic module of this solar cell, the solar cell related to includes the silicon chip and sets up in the electrode main grid on silicon chip surface, the silicon chip includes main part and attenuate portion, attenuate portion integrated into one piece in at least one side in the main part in the relative both sides on the electrode main grid extending direction, the thickness of attenuate portion is less than the thickness of main part; based on the utility model discloses well solar wafer subtracts setting of thin portion, in concrete photovoltaic module's application scene, the interconnection strip can extend to the back of another adjacent solar wafer by the front of a solar wafer through the attenuate a side surface of thin portion, so can reduce the crookedness of interconnection strip, and then can avoid increasing the piece rate in the photovoltaic module manufacture process when reducing adjacent two solar wafer intervals, effectively reduce photovoltaic module's single cost of manufacture.

Description

Solar cell and photovoltaic module with same

Technical Field

The utility model relates to a solar photovoltaic field especially relates to a solar wafer and have photovoltaic module of this solar wafer.

Background

When the solar photovoltaic module is manufactured, adjacent solar cells in the same cell string are connected through the interconnection strips, and the interconnection strips connect the front electrodes of one solar cell with the back electrodes of the adjacent solar cells, so that the series connection of the solar cells is realized. In the prior art, the sunlight absorption area of the module can be better increased by a method of reducing the distance between two adjacent solar cells to increase the number of the cells in the same plate-type module, so that the power of the photovoltaic module is improved.

However, the prior art has the following problems: when the interval between two adjacent solar wafer contracts, can increase the crookedness of connecting the interconnection strip between two solar wafer, so at the lamination in-process of interconnection strip welding and later stage subassembly equipment, the piece phenomenon very easily appears in the solar wafer, has great piece rate promptly to lead to photovoltaic module's single watt cost of manufacture to increase.

In view of the above, there is a need to provide an improved solution to the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that prior art exists at least, for realizing the above-mentioned utility model purpose, the utility model provides a solar wafer, its concrete design mode as follows.

A solar cell comprises a silicon wafer and electrode main grids arranged on the surface of the silicon wafer, wherein the silicon wafer comprises a main body part and a thinning part, the thinning part is integrally formed on at least one of two opposite sides of the main body part in the extending direction of the electrode main grids, and the thickness of the thinning part is smaller than that of the main body part.

Further, the thickness of each position of the thinning part is uniform and consistent.

Further, the thickness of the thinned portion has a tendency to gradually decrease in a direction away from the main body portion.

Further, the upper surface and the lower surface of the thinning portion are located between the plane of the upper surface and the plane of the lower surface of the main body portion.

Further, one of the upper and lower surfaces of the thinning portion is on the same plane as the corresponding side surface of the main body portion.

Furthermore, the main body part is connected with the thinning parts on two opposite sides in the extending direction of the electrode main grid, the upper surface of one of the thinning parts and the upper surface of the main body part are positioned on the same plane, and the lower surface of the other thinning part and the lower surface of the main body part are positioned on the same plane.

Further, the width dimension of each thinning part in the extending direction of the electrode main gate is not less than 0.1 mm.

Further, the difference between the thickness of the main body portion and the minimum thickness of the thinned portion is in a range of 10 μm to 60 μm.

Further, the solar cell is a half cell.

The utility model also provides a photovoltaic module, this photovoltaic module include a plurality of adjacent settings as above solar wafer and connect adjacent two the interconnection strip of battery piece, the interconnection strip at least with a solar wafer attenuate a side surface cooperation of portion.

The utility model has the advantages that: based on the utility model discloses well solar wafer subtracts setting of thin portion, in concrete photovoltaic module's application scene, the interconnection strip can extend to the back of another adjacent solar wafer by the front of a solar wafer through the attenuate a side surface of thin portion, so can reduce the crookedness of interconnection strip, and then can avoid increasing the piece rate in the photovoltaic module manufacture process when reducing adjacent two solar wafer intervals, effectively reduce photovoltaic module's single cost of manufacture.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view of a first embodiment of a solar cell according to the present invention;

FIG. 2 is a schematic view of a second embodiment of the solar cell of the present invention;

FIG. 3 is a schematic view of a third embodiment of a solar cell according to the present invention;

FIG. 4 is a schematic view of a fourth embodiment of the solar cell of the present invention;

FIG. 5 is a schematic structural diagram of an embodiment of a photovoltaic module formed by the solar cell shown in FIG. 4;

fig. 6 is a schematic cross-sectional view at the position a-a' in fig. 5.

In the drawing, 100 denotes a solar cell, 11 denotes a main body portion, 12 denotes a thinned portion, 120 denotes a mating surface, 200 denotes an interconnection bar, and 20 denotes an intermediate portion of the interconnection bar.

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 only some embodiments of the present invention, not all embodiments. 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.

The present invention relates to a solar cell, which comprises a silicon wafer 100 and a main electrode grid (not shown) disposed on the surface of the silicon wafer 100. It is understood that the electrode main grid generally includes a plurality of front electrode main grids spaced in parallel on the front surface of the silicon wafer 100 and a plurality of back electrode main grids spaced in parallel on the back surface of the silicon wafer 100, and the front electrode main grids and the back electrode main grids have the same extending direction.

Referring to fig. 1, 2, 3 and 4, a silicon wafer 100 according to the present invention includes a main body 11 and a thinning portion 12, wherein the thinning portion 12 is integrally formed on at least one of two opposite sides of the main body 11 in an extending direction of a main gate of an electrode, and a thickness of the thinning portion 12 is smaller than a thickness of the main body 11.

The utility model also provides a photovoltaic module, this photovoltaic module include a plurality of adjacent settings as above solar wafer and connect the interconnection strip 200 of two adjacent battery pieces, interconnection strip 200 at least with the attenuate a side surface cooperation of a solar wafer attenuate portion 12. As shown in fig. 5 and 6, in this embodiment, the thinning portions 12 are disposed on two adjacent sides of two solar cells, and two adjacent thinning portions 12 have the mating surfaces 120 that mate with the interconnection bar 200, and in this embodiment, the two mating surfaces 120 that mate with the interconnection bar 200 are both a side surface that is thinned corresponding to the thinning portions 12. It is understood that the one side surface where the thinning portion 12 is thinned refers to one side surface which is recessed with respect to the plane where the corresponding side surface of the main body portion 11 is located.

Based on the utility model discloses well solar wafer subtracts setting of thin portion 12, in concrete photovoltaic module's application scene, interconnection strip 200 can extend to another adjacent solar wafer's the back by a solar wafer's front through the attenuate a side surface of thin portion 12, so can reduce interconnection strip 200's crookedness. Referring to fig. 6, the intermediate section 20 of the interconnection strip 200 between two adjacent solar cells has a small curvature. The bending degree of the interconnection strip 200 is reduced, so that the distance between two adjacent solar cells is reduced, the fragment rate of the photovoltaic module in the manufacturing process is prevented from being increased, and the single-tile manufacturing cost of the photovoltaic module can be effectively reduced.

For a better understanding of the present invention, some embodiments of the present invention are described further below.

Referring to fig. 1 and 2, in some embodiments of the present invention, the thickness of the thinning portion 12 is uniform at each position. The main body 11 of the silicon wafer 100 in the embodiment shown in fig. 1 is connected to the thinned portions 12 on two opposite sides in the extending direction of the electrode main gate, while the main body 11 of the silicon wafer 100 in the embodiment shown in fig. 2 is connected to the thinned portions 12 on only one of the two opposite sides in the extending direction of the electrode main gate.

Referring to fig. 3 and 4, in other embodiments of the present invention, the thickness of the thinned portion 12 tends to decrease in a direction away from the main body portion 11. In a preferred embodiment, no step is formed at the boundary position between the main body 11 and the thinning portion 12 in the specific implementation process, so that the probability of false printing caused by the step in the screen printing process of the solar cell can be reduced, and a gap caused by the step can be prevented from being formed between the solder strip 200 and the surface of the silicon wafer 100.

In some embodiments of the present invention, the two side surfaces of the thinning portion 12 are recessed relative to the plane of the corresponding two surfaces of the main body portion 11, as shown in fig. 1, fig. 2 and fig. 3, that is, the upper surface and the lower surface of the thinning portion 12 are located between the plane of the upper surface and the plane of the lower surface of the main body portion 11.

In some embodiments of the present invention, only one of the two side surfaces of the thinning portion 12 may be recessed with respect to the plane of the corresponding surface of the main body portion 11. Referring to fig. 4, in the present embodiment, the upper surface of the right side thinned portion 12 of the main body portion 11 is recessed with respect to the plane of the upper side surface of the main body portion 11, and the lower surface is on the same plane as the lower surface of the main body portion 11; the lower surface of the left side thinned portion 12 of the main body 11 is recessed with respect to the plane of the lower surface of the main body 11, and the upper surface is flush with the upper surface of the main body 11.

The embodiment shown in fig. 4 is the utility model discloses a better implementation way, the solar wafer of structure is so implemented in the assembly process of specifically being applied to photovoltaic module, the crookedness that is connected to two different surface solder strips 200 of silicon chip 100 can be reduced respectively to the portion of reducing thickness 12 of its both sides, and because each reduces the region 12 and only thins a side surface when specifically shaping, can avoid reducing the mechanical strength at solar wafer both ends on the electrode main grid extending direction by a wide margin to a certain extent, ensure that solar wafer can not appear fragile problem because of the attenuate in the assembly process.

In the practical implementation process of the present invention, as shown in fig. 1 and 4, the width w of each thinning portion 12 in the extending direction of the main gate of the electrode is not less than 0.1 mm. The difference between the thickness d1 of the main body portion 11 and the minimum thickness d2 of the reduced thickness portion is in the range of 10 μm to 60 μm. The thickness d1 of the body portion 11 of the silicon wafer 100 is generally in the range of 150 μm to 200. mu.m.

It can be understood that the solar cell piece that relates to in the utility model can be conventional square battery, also can be half a battery, and half a battery is cut apart the shaping by monoblock square battery usually.

For better understanding the utility model discloses, the following means that is used for preparing the utility model discloses solar wafer is provided. Specifically, before the texturing process is performed on the silicon wafer 100, one end or the opposite ends of the silicon wafer 100 are polished with a polishing liquid, and the region where the silicon wafer is polished constitutes the thinning portion 12 and the other regions constitute the body region 11. It can be understood that in the specific implementation process, if the thinned portion 12 with uniform thickness is required to be obtained, the end portion of the silicon wafer 100 to be polished can be inserted into the polishing solution and the inserted deep portion can be kept unchanged to perform the polishing reaction; if the thinning part 12 with the gradually decreasing thickness in the direction away from the main body 11 needs to be obtained, the end of the silicon wafer 100 can be inserted into the polishing solution, and then different regions of the thinning part 12 of the silicon wafer 100 can have different reaction times in the polishing solution by gradually increasing the height of the silicon wafer 100. The utility model discloses other process flow of well solar wafer can refer to prior art, do not further expand here.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. The solar cell piece comprises a silicon wafer and an electrode main grid arranged on the surface of the silicon wafer, and is characterized in that the silicon wafer comprises a main body part and a thinning part, the thinning part is integrally formed on at least one of two opposite sides of the main body part in the extending direction of the electrode main grid, and the thickness of the thinning part is smaller than that of the main body part.

2. The solar cell sheet according to claim 1, wherein the thickness of the thinned portion is uniform at each position.

3. The solar cell sheet according to claim 1, wherein the thickness of the thinned portion has a tendency to gradually decrease in a direction away from the main body portion.

4. The solar cell sheet according to any one of claims 1 to 3, wherein the upper surface and the lower surface of the thinning portion are located between the plane of the upper surface and the plane of the lower surface of the main body portion.

5. The solar cell sheet according to any one of claims 1 to 3, wherein one of the upper surface and the lower surface of the thinned portion is on the same plane as the corresponding side surface of the main body portion.

6. The solar cell piece according to claim 5, wherein the main body portion is connected to the thinned portions on opposite sides in the extending direction of the electrode main grid, an upper surface of one of the thinned portions and an upper surface of the main body portion are on the same plane, and a lower surface of the other of the thinned portions and a lower surface of the main body portion are on the same plane.

7. The solar cell piece according to any one of claims 1 to 3, wherein the width dimension of each of the thinned portions in the extending direction of the electrode main grid is not less than 0.1 mm.

8. The solar cell sheet according to any one of claims 1 to 3, wherein the difference between the thickness of the main body portion and the minimum thickness of the thinned portion is in a range of 10 μm to 60 μm.

9. The solar cell sheet according to any one of claims 1 to 3, wherein the solar cell sheet is a half-cell.

10. A photovoltaic module comprising a plurality of solar cells disposed adjacent to each other as claimed in any one of claims 1 to 9 and interconnecting strips connecting adjacent two of said cells, said interconnecting strips engaging at least one thinned side surface of said thinned portion of one of said solar cells.