CN111244198A - Solar cell and photovoltaic module - Google Patents

Abstract

The invention discloses a solar cell sheet, comprising a plurality of cutting regions; the cutting regions are cut to obtain a shingled cutting sheet used for connecting in series into a battery string of a solar module; the cutting region comprises a front main grid, a front thin grid and rear busbar, wherein the front busbar and the rear busbar are arranged along one long side of the cutting area, and the front fine grid is arranged perpendicular to the front busbar; the width of the cutting area The range is 13.5 mm to 35 mm, inclusive; the width of the solar cell sheet is in the range of 163 mm to 210 mm, inclusive. In the present invention, by improving the width of the cutting area in the large-sized solar cell sheet, the length of the front fine grid for collecting current on the cutting sheet obtained after cutting is shortened, so as to reduce the internal consumption of the module and improve the output power. Effect. The present invention also provides a photovoltaic module with the above beneficial effects.

Description

A solar cell and photovoltaic module

technical field

The invention relates to the field of new energy, in particular to a solar cell and a photovoltaic assembly.

Background technique

As an inexhaustible clean energy, solar energy has been paid more and more attention by people from all walks of life. The role of solar cells is to convert solar energy into electrical energy and drive the terminal load to work. In recent years, photovoltaic module technology has made rapid development, and the continuous innovation of module technology is of great significance to the realization of parity in photovoltaic power generation.

Traditional crystalline silicon modules generally use interconnected strip welding to realize the series connection of the cells inside the crystalline silicon module. Currently, a shingled technology has emerged, which realizes the series connection of the internal cells of the crystalline silicon module by lamination. At this stage, the graphic design of shingled cells is generally based on cells with side lengths of 156mm and 158.75mm. The graphics of the cells are designed so that several (usually five) slices can be laser-cut into slices of the same width. The front side of each cutting piece is provided with a main grid line and a secondary grid line, and the back side is provided with a main grid line.

However, with the increase in the demand for solar cell coverage per unit area and the need to reduce costs, the size of solar cells continues to increase, and the size of the cutting sheet also increases, and the current needs to go through the process from generation to export. The transmission path is also getting longer and longer, all of which make the internal consumption of the components rise.

Therefore, how to solve the increase in internal friction caused by the increase in the size of the solar cell has become an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a solar cell sheet and a photovoltaic module to solve the increasing extra power consumption caused by the long collection path of the current generated by the solar cell in the prior art.

In order to solve the above technical problems, the present invention provides a solar cell sheet, which includes a plurality of cutting regions;

After the cutting area is cut, a shingled cutting sheet for connecting in series to form a battery string of a solar module is obtained;

The cutting area includes a front busbar, a front thin grid and a back busbar, wherein the front busbar and the backside busbar are arranged along a long side of the cutting area, and the front thin grid is perpendicular to the Front busbar setting;

the width of the cutting area is in the range of 13.5 mm to 35 mm, inclusive;

The width of the solar cell sheet ranges from 163 millimeters to 210 millimeters, inclusive.

Optionally, in the solar cell sheet, the cutting area further includes a current collecting line;

The current collecting lines are used to electrically connect the front fine grids.

Optionally, in the solar cell sheet, the collector lines are edge grid lines;

The edge grid lines are arranged on a long side of the cutting area opposite to the front busbar.

Optionally, in the solar cell sheet, the width of the rear busbar is greater than the width of the front busbar.

Optionally, in the solar cell sheet, the solar cell sheet is a chamfered cell sheet.

Optionally, in the solar cell sheet, the solar cell sheet is a monocrystalline solar cell sheet or a polycrystalline solar cell sheet.

Optionally, in the solar cell sheet, the solar cell sheet is a double-sided solar cell.

Optionally, in the solar cell sheet, the number of the cutting regions included in the solar cell sheet ranges from 6 to 12.

A photovoltaic assembly, the solar cell string of the photovoltaic assembly includes the shingled cutting sheet according to any one of the above.

The solar cell sheet provided by the present invention includes a plurality of cutting regions; the cutting regions are cut to obtain a shingled cutting sheet for connecting in series into a battery string of a solar module; the cutting region includes a front main grid and a front fine grid and the rear busbar, wherein the front busbar and the rear busbar are arranged along a long side of the cutting area, and the front fine grid is arranged perpendicular to the front busbar; the width of the cutting area is within the range of is 13.5 mm to 35 mm, inclusive; the width of the solar cell sheet ranges from 163 mm to 210 mm, inclusive. In order to expand the coverage area of the solar cell panel in the finished photovoltaic module and reduce the cost at the same time, it is a general trend to expand the size of the solar cell sheet. The length of the front fine grid used for collecting current on the cutting sheet is shortened. Compared with the busbar with a larger cross-sectional area, the front fine grid has a greater resistance, and the shorter the front fine grid through which the current flows can be shortened. The longer the distance is, the more effectively the internal resistance can be reduced, that is, the distance that the current generated by the cutting sheet is irradiated by the incident light and collected to the front main grid is shortened, so as to reduce the internal consumption of the module and improve the output power. . The present invention also provides a photovoltaic module with the above beneficial effects.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following will briefly introduce the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic structural diagram of a specific embodiment of a solar cell sheet provided by the present invention;

2 is a schematic diagram of a cutting process of a specific embodiment of a solar cell sheet provided by the present invention;

3 is a schematic structural diagram of another specific embodiment of the solar cell sheet provided by the present invention;

FIG. 4 is a schematic structural diagram of another specific embodiment of the solar cell sheet provided by the present invention.

Detailed ways

In order to make those skilled in the art 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. Obviously, the described embodiments are only some, but not all, embodiments of the present 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.

The core of the present invention is to provide a solar cell sheet, and a schematic structural diagram of a specific embodiment of the solar cell sheet is shown in FIG.

After the cutting area 100 is cut, a shingled cutting sheet for connecting in series into a battery string of a solar module is obtained;

The cutting area 100 includes a front bus bar 110 , a front thin grid 120 and a back bus bar 130 , wherein the front bus bar 110 and the back bus bar 130 are arranged along a long side of the cutting area 100 , and the The front thin grids 120 are arranged perpendicular to the front main grids 110;

The width of the cutting area 100 ranges from 13.5 mm to 35 mm, inclusive;

The width of the solar cell sheet ranges from 163 millimeters to 210 millimeters, inclusive.

In addition, the solar cells are chamfered cells, and the chamfered design can make the solar cells less likely to be damaged by bumps during transportation and installation.

Also, the solar cell sheet may be a monocrystalline solar cell sheet or a polycrystalline solar cell sheet. Further, the solar cell sheet is a double-sided solar cell.

It should be noted that the front busbar 110 and the rear busbar 130 of the same cutting area 100 cannot be on the same side. If the front busbar 110 is on the left side of the cutting area 100, all the The back busbar 130 is on the right side of the cutting area 100 . Further, the front grid lines of different cutting areas 100 on the same solar cell sheet may be on the same side of the corresponding cutting area 100 . , or on different sides, such as the front busbars 110 of two adjacent cutting areas 100 , one on the left side of the corresponding cutting area 100 and the other on the right side of the corresponding cutting area 100 . The schematic diagram before and after the cutting process is shown in Figure 2. In Figure 2, the curved part passing through the solar cell sheet marks the structure of the repeated cutting area 100 omitted in the middle. Cut pieces.

It should be noted that, in the present invention, "the front busbar 110 and the rear busbar 130 are arranged along a long side of the cutting area 100" should be understood as the front busbar 110 being close to or abutting the One long side of the cutting area 100 is provided. Since the cutting area 100 is to be cut into the cutting sheet after subsequent cutting, the front busbar 110 (or the rear busbar 130 ) can be a certain distance from the edge of the cutting area 100 distance, to ensure the success rate of processing.

Corresponding to the width of the solar cell and the span of the cutting sheet, if there is no waste, the number of the cutting regions 100 included in the solar cell sheet ranges from 6 to 12.

The solar cell sheet provided by the present invention includes a plurality of cutting regions 100 ; the cutting regions 100 are cut to obtain a shingled cutting sheet that is used in series to form a battery string of a solar module; the cutting region 100 includes a front busbar 110 , front thin grid 120 and back main grid 130, wherein the front bus grid 110 and the back bus grid 130 are arranged along a long side of the cutting area 100, and the front thin grid 120 is perpendicular to the front main grid The grid 110 is provided; the width of the cutting area 100 is in the range of 13.5 mm to 35 mm, inclusive; the width of the solar cell sheet is in the range of 163 mm to 210 mm, inclusive. In order to expand the coverage area of the solar cell panel in the finished photovoltaic module and reduce the cost, it is a general trend to enlarge the size of the solar cell sheet. The present invention improves the width of the cutting area 100 in the large-sized solar cell sheet, so that the The length of the front fine grid 120 used for collecting current on the cutting sheet is shortened. Compared with the main grid with a larger cross-sectional area, the front fine grid 120 has a greater resistance, and the shorter the front side through which the current flows can be shortened. The distance of the fine grid 120 can effectively reduce the internal resistance, that is to ensure that the current generated by the cutting sheet after being irradiated by the incident light needs to be collected to the front main grid 110. The effect of improving the output power.

On the basis of the first embodiment, the front structure of the solar cell sheet is further improved to obtain the second embodiment, the schematic diagram of which is shown in FIG. 3 , including a plurality of cutting regions 100;

After the cutting area 100 is cut, a shingled cutting sheet for connecting in series into a battery string of a solar module is obtained;

The cutting area 100 includes a front bus bar 110 , a front thin grid 120 and a back bus bar 130 , wherein the front bus bar 110 and the back bus bar 130 are arranged along a long side of the cutting area 100 , and the The front thin grids 120 are arranged perpendicular to the front main grids 110;

The width of the cutting area 100 ranges from 13.5 mm to 35 mm, inclusive;

the width of the solar cell sheet is in the range of 163 millimeters to 210 millimeters, inclusive;

The cutting area 100 further includes a current collecting line 140;

The current collecting lines 140 are used to electrically connect the front thin grids 120 .

The difference between this specific embodiment and the above-mentioned specific embodiment is that in this specific embodiment, the current collecting line 140 is added between the front fine grids 120, and the other structures are the same as the above-mentioned specific embodiment. This will not be repeated here.

In this specific embodiment, the current collecting lines 140 are added between the front fine grids 120 to realize the electrical connection between different front fine grids 120 , so that the front fine grids 120 are accidentally used during use. In the case of partial breakage, the electric energy generated by the solar cells in the corresponding area will not be unable to be collected to the main grid, but will be dispersed to other adjacent normal conductive front fine grids 120 through the current collecting line 140 to be collected. On the front main grid 110, the working reliability and service life of the photovoltaic modules are greatly improved.

As a preferred solution, the current collecting line 140 is an edge grid line;

The edge grid lines are arranged on the long side of the cutting area 100 opposite to the front main grid 110. Compared with the collector lines 140 of other structures, the edge grid lines are simple to erect, easy to calibrate, and can greatly improve the performance of the cutting area. Improve production efficiency. In FIG. 3 , edge grid lines are provided on the opposite side of the front busbar 110 .

On the basis of the second embodiment, the front structure of the solar cell sheet is further improved, and the third embodiment is obtained. The schematic diagram of the structure is shown in FIG. 4 , including a plurality of cutting regions 100;

After the cutting area 100 is cut, a shingled cutting sheet for connecting in series into a battery string of a solar module is obtained;

The cutting area 100 includes a front bus bar 110 , a front thin grid 120 and a back bus bar 130 , wherein the front bus bar 110 and the back bus bar 130 are arranged along a long side of the cutting area 100 , and the The front thin grids 120 are arranged perpendicular to the front main grids 110;

The width of the cutting area 100 ranges from 13.5 mm to 35 mm, inclusive;

the width of the solar cell sheet is in the range of 163 millimeters to 210 millimeters, inclusive;

The cutting area 100 further includes a current collecting line 140;

The current collecting lines 140 are used to electrically connect the front fine grids 120;

The width of the rear busbar 130 is greater than the width of the front busbar 110 .

The difference between this specific embodiment and the above specific embodiment is that in this specific embodiment, the structural relationship between the front busbar 110 and the rear busbar 130 is limited, and the rest of the structures are the same as the above specific embodiment. are the same, and will not be repeated here.

In this specific embodiment, the width of the back busbar 130 is defined to be greater than the width of the front busbar 110, because in the string welding of the cutting sheets, the alignment process of the adjacent cutting sheets mainly depends on sight or machine Image acquisition is performed for calibration, and most of the images are images of the front side of the cutting sheet, and the back side of the cutting sheet cannot be directly observed. Therefore, enlarging the width of the back busbar 130 can effectively ensure the busbar during the string welding process. The effective connection between them ensures electrical continuity, reduces defective products in the production process, and improves the yield of final products.

The present invention also provides a photovoltaic module with the above beneficial effects, wherein the solar cell string of the photovoltaic module includes the shingled cutting sheet described in any of the above. The solar cell sheet provided by the present invention includes a plurality of cutting regions 100 ; the cutting regions 100 are cut to obtain a shingled cutting sheet that is used in series to form a battery string of a solar module; the cutting region 100 includes a front busbar 110 , front thin grid 120 and back main grid 130, wherein the front bus grid 110 and the back bus grid 130 are arranged along a long side of the cutting area 100, and the front thin grid 120 is perpendicular to the front main grid The grid 110 is provided; the width of the cutting area 100 is in the range of 13.5 mm to 35 mm, inclusive; the width of the solar cell sheet is in the range of 163 mm to 210 mm, inclusive. In order to expand the coverage area of the solar cell panel in the finished photovoltaic module and reduce the cost, it is a general trend to enlarge the size of the solar cell sheet. The present invention improves the width of the cutting area 100 in the large-sized solar cell sheet, so that the The length of the front fine grid 120 used for collecting current on the cutting sheet is shortened. Compared with the main grid with a larger cross-sectional area, the front fine grid 120 has a higher resistance, and the shorter the front side through which the current flows can be shortened. The distance of the fine grid 120 can effectively reduce the internal resistance, that is to ensure that the current generated by the cutting sheet after being irradiated by the incident light needs to be collected to the front main grid 110. The effect of improving the output power.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments may be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

It should be noted that in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations There is no such actual relationship or order between them. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The solar cells and photovoltaic modules provided by the present invention have been described in detail above. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also 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 (9)

1. A solar cell piece is characterized by comprising a plurality of cutting areas;

obtaining a laminated tile cutting sheet for the battery string connected in series into the solar module after cutting the cutting region;

the cutting area comprises a front main grid, a front fine grid and a back main grid, wherein the front main grid and the back main grid are arranged along one long edge of the cutting area, and the front fine grid is perpendicular to the front main grid;

the width of the cutting region ranges from 13.5 millimeters to 35 millimeters, inclusive;

the width of the solar cell sheet ranges from 163 mm to 210 mm, inclusive.

2. The solar cell sheet of claim 1, wherein the cut region further comprises a collector line;

and the current collecting lines are used for electrically connecting the front surface fine grids.

3. The solar cell of claim 2, wherein the collector line is an edge grid line;

the edge grid line is arranged on the long edge of the cutting area opposite to the front main grid.

4. The solar cell of claim 1, wherein the width of the back side main grid is greater than the width of the front side main grid.

5. The solar cell of claim 1, wherein the solar cell is a chamfered cell.

6. The solar cell sheet according to claim 1, wherein the solar cell sheet is a single crystal solar cell sheet or a polycrystalline solar cell sheet.

7. The solar cell sheet according to claim 1, wherein the solar cell sheet is a bifacial solar cell.

8. The solar cell sheet according to claims 1 to 7, wherein the solar cell sheet comprises a number of the cut regions ranging from 6 to 12.

9. A photovoltaic module characterized in that the string of solar cells of the photovoltaic module comprises a shingle cut sheet according to any of claims 1 to 8.

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