CN210926035U - Solar cell and photovoltaic module - Google Patents

Abstract

The utility model discloses a solar cell and photovoltaic module, the solar cell comprises N main grid lines which are arranged in parallel on the back of the cell and a plurality of auxiliary grid lines which are vertically crossed with the main grid lines, wherein both ends of each main grid line and both ends of each auxiliary grid line are connected with a frame line, and a plurality of sections of back electrodes which are sequentially arranged along the extending direction of the main grid line are arranged on each main grid line; each of the two end portions of the main grid line, which are connected with the frame line, respectively comprises two connecting lines, and the two connecting lines are arranged in parallel at a preset distance. The solar cell can confirm whether the alignment is accurate or not by directly observing the printing appearance of the cell, and is beneficial to improving the productivity of the photovoltaic cell.

Description

Solar cell and photovoltaic module

Technical Field

The utility model belongs to the technical field of the photovoltaic power generation technique and specifically relates to a solar wafer and a photovoltaic module are related to.

Background

At present, the double-sided battery gradually becomes a mainstream product in the solar battery industry, and the printing offset of the aluminum wire on the back surface is the most troublesome problem in the mass production process of the double-sided battery, so that the productivity is influenced, and a large number of low-efficiency sheets can be generated.

In the related technology, the back electric field of the double-sided battery is designed to be an aluminum wire, the requirement on the alignment precision of the back aluminum wire and a laser pattern in double-sided battery printing is high, and the aluminum wire is required to be completely overlapped with a back laser opening line. However, in the current double-sided battery back surface electric field pattern design, a manufacturer cannot directly observe the printed appearance in the production process to determine whether the alignment is accurate, and the offset needs to be found and adjusted by means of EL (Electroluminescence test) and a microscope, so that the response to the abnormality and the adjustment speed for solving the abnormality are slow.

Disclosure of Invention

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a solar wafer, this solar wafer can just can confirm through direct observation battery piece printing outward appearance whether accurate counterpoint does benefit to the productivity that improves photovoltaic cell.

The utility model discloses a second purpose lies in providing a photovoltaic module.

In order to solve the above problem, an embodiment of the present invention provides a solar cell, including N main grid lines arranged in parallel on the back of the solar cell, and a plurality of sub-grid lines arranged perpendicularly to the main grid lines, wherein both ends of each main grid line and both ends of the sub-grid lines are connected to a frame line, and each main grid line is provided with a plurality of segments of back electrodes sequentially arranged along the extending direction of the main grid line; each of the two end portions of the main grid line, which are connected with the frame line, respectively comprises two connecting lines, and the two connecting lines are arranged in parallel at a preset distance.

According to the utility model discloses a solar wafer, two tip positions through being connected every main grid line and frame line set up to two connecting wires at a distance of predetermineeing distance and parallel, change into by two connecting wires by the connecting wire of connecting main grid line and frame line originally promptly, thereby the back of the body electric field structure is through the printing back, can be directly in the interval area between two connecting wires intra-area, whether the aluminium grid line of observing laser opening line and left and right sides printing through the naked eye is on a straight line, compare in conventional cell piece back of the body electric field figure, the producer of being convenient for is through direct observation cell piece printing outward appearance, just can confirm whether laser opening line and aluminium grid line are accurate to the position, do benefit to the adjustment and print the skew.

In some embodiments, the sum of the widths of the two connecting lines and the preset distance is equal to the width of the main gate line.

In some embodiments, the width of the main gate line is 1.4mm, the width of each of the two connecting lines is 0.17mm, and the preset distance is 1.06 mm.

In some embodiments, further comprising: the number N is 9, and the number N,

the first hollow area and the second hollow area are arranged on the third main grid line at intervals, the third hollow area and the fourth hollow area are arranged on the seventh main grid line at intervals, and the first hollow area, the second hollow area, the third hollow area and the fourth hollow area are arranged in a regular quadrangle.

In some embodiments, a first alignment hole and a second alignment hole are formed in a secondary gate line region between a first main gate line and a second main gate line, and the first alignment hole and the second alignment hole are both close to the second main gate line and between ends of the first back electrode and the second back electrode of the main gate lines, which are far away from the frame line; a third alignment hole and a fourth alignment hole are arranged in an auxiliary grid line region between a ninth main grid line and an eighth main grid line, and the third alignment hole and the fourth alignment hole are both close to the eighth main grid line and are positioned between the ends, far away from the frame line, of the head and tail sections of the eighth main grid line and the back electrode; the first aligning hole, the second aligning hole, the third aligning hole and the fourth aligning hole are arranged in a regular quadrangle.

In some embodiments, the battery piece further comprises four laser matching blocks arranged on the back of the battery piece corresponding to the four hollow-out areas.

In some embodiments, each of the hollowed-out areas is square, each of the laser matching blocks is square, and the side length of the hollowed-out area is greater than that of the laser matching block at the corresponding position.

In some embodiments, the side length of the laser matching block is 1.0mm, and the side length of the hollow area is 1.1 mm.

In some embodiments, the solar cell further comprises four laser alignment points disposed on the back of the solar cell corresponding to the four alignment holes.

In some embodiments, each of the alignment holes is circular in shape, each of the laser pair sites is circular in shape, and the alignment holes have a diameter greater than a diameter of the laser pair sites.

The utility model discloses photovoltaic module that the second aspect provided, include, the battery piece array includes a plurality of above-mentioned embodiments solar wafer.

According to the utility model provides a photovoltaic module adopts the battery piece that above-mentioned embodiment provided through the battery piece array, and the producer of being convenient for just can confirm whether laser opening line and aluminium grid line are accurate to the position through direct observation back of the body electric field printing outward appearance, does benefit to the adjustment and prints the skew.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a prior art photovoltaic cell back electric field halftone pattern;

FIG. 2 is a schematic diagram of a prior art backside laser opening process;

FIG. 3 is a schematic diagram of a prior art cell after back field printing;

fig. 4 is a schematic view of a solar cell sheet according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a backside laser opening process according to an embodiment of the present invention;

fig. 6 is a schematic view of a back electric field screen according to an embodiment of the present invention;

fig. 7 is a schematic view of a main gate line and a border line connection in a photovoltaic cell according to an embodiment of the present invention;

fig. 8 is a schematic view of a solar cell sheet according to another embodiment of the present invention;

fig. 9 is a schematic diagram of a cell laser matching block location according to an embodiment of the present invention;

fig. 10 is a schematic diagram of the position of the cell alignment holes according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a photovoltaic module according to an embodiment of the present invention.

Reference numerals:

the prior art comprises the following steps: a back electrode 8; aligning the marking hole 9; a laser marking point 13;

the utility model discloses:

a main gate line 2; a sub-grid line 3; a frame wire 4; a back electrode 5; a first connecting line 11; a second connecting line 12;

a first registration hole 21; a second alignment hole 22; a third alignment hole 23; a fourth alignment hole 24; the first hollow-out area 31; the second hollow-out region 32; a third hollow-out area 33; a fourth hollowed-out area 34;

a laser opening line 6; a first laser alignment point 25; a second laser alignment point 26; a third laser alignment point 27; a fourth laser alignment point 28; a first laser matching block 35; a second laser matching block 36; a third laser matching block 37; a fourth laser matching block 38;

a photovoltaic module 20; an array of battery plates 7.

Detailed Description

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.

In the prior art, as shown in fig. 1, a schematic diagram of a photovoltaic cell back electric field halftone pattern is shown, wherein the design positions of halftone pattern alignment mark holes 9 are four corners of the pattern and are relatively close to the edge position of the halftone image. Fig. 2 is a schematic diagram of a back laser opening process corresponding to a double-sided battery, in which the back electrode 8 is designed to be hollow, and four laser mark points 13 are located at four corners and correspond to alignment mark points in a pattern of a screen on the back of the double-sided battery. As shown in fig. 3, which is a schematic diagram of a battery cell after back electric field printing, the laser mark point 13 is located in the middle of the alignment mark point 9, i.e., the circular hollow area, and a manufacturer can only see the alignment condition of the mark point through the position, but cannot directly confirm whether the alignment condition of the laser line and the printed aluminum line is accurate by observing the printed appearance.

In order to solve the above problem, the solar cell according to the embodiment of the present invention is described below with reference to the accompanying drawings, and this solar cell can confirm whether the alignment is accurate through directly observing the printed appearance of the solar cell, which is beneficial to improving the productivity of the photovoltaic cell.

As shown in fig. 4, the utility model discloses a solar cell sheet's schematic diagram, include, the main grid line 2 of the mutual parallel arrangement of N on the cell sheet back, with the many vice grid lines 3 of the perpendicular crossing setting of main grid line 2, the both ends of every main grid line 2 and the both ends of vice grid line 3 all are connected with frame line 4, are provided with a plurality of sections back electrode 5 that arrange in proper order along the 2 extending direction of main grid line on every main grid line 2.

The back electric field of the photovoltaic cell is designed to be an aluminum wire, if the back aluminum wire is printed and deviated, the productivity of the photovoltaic cell is affected, and a large number of low-efficiency cell pieces are generated, so that in the printing process of the photovoltaic cell, the requirement on the alignment precision of the back aluminum wire and the laser pattern is high, the aluminum wire needs to be completely overlapped with the back laser opening line, specifically, as shown in fig. 5, the back laser opening process corresponding to the solar cell piece of the present invention is schematically illustrated, wherein the hollow design in fig. 5, that is, the blank area corresponds to the position of the back electrode 5 in fig. 4, the back electric field of the cell piece is etched by using the laser process pattern shown in fig. 5, and after etching, the back electric field of the solar cell piece is printed by using the cell piece back electric field pattern screen printing plate shown in fig. 6, and the alignment precision needs to be paid attention, so as to avoid printing deviation.

Whether accurate for observing the counterpoint for being convenient for, in the solar wafer shown in fig. 4, 2 end to end both ends of every main grid line and the regional connected portion of 5 back electrodes who reserves, the utility model relates to a will be changed into two solid lines by original thick solid line, be about to the connecting wire of two tip that every main grid line 2 and frame line 4 are connected sets up to two connecting wires that are parallel to each other at a distance of presetting the distance, first connecting wire 11 and second connecting wire 12 promptly.

Further, in the embodiment, the sum of the widths of the two connection lines and the preset distance is equal to the width of the main gate line 2, for example, as shown in fig. 7, the width of the main gate line 2 is 1.4mm, the widths of the two connection lines are both 0.17mm, and the preset distance is 1.06mm, so that the width of the main gate line 2 is not increased. A spacing region exists between the first connecting line 11 and the second connecting line 12, so that the laser opening line 6 can be directly observed by naked eyes in the spacing region, and therefore, a manufacturer can confirm whether the alignment condition of the laser opening line 6 and the printed aluminum lines on the left side and the right side is accurate through observation directly in the spacing region, EL or microscope observation is not needed, and the method is simple, convenient and quick.

According to the utility model discloses a solar wafer, two tip positions through being connected every main grid line 2 and border line 4 set up to two connecting wires at a distance of predetermineeing distance and parallel, change into by two connecting wires by the original connecting wire of connecting main grid line 2 and border line 4 promptly, thereby after back of the body electric field printing, can be directly in the interval area between two connecting wires, just can observe whether the aluminium grid line of laser opening line 6 and left and right sides printing is on a straight line through the naked eye, compare in conventional cell piece back of the body electric field figure, need not with the help of EL or microscope observation, the producer is direct through observing back of the body electric field printing outward appearance, just can confirm whether laser opening line 6 is accurate with the aluminium grid line alignment, simple and convenient, thereby do benefit to the adjustment printing skew, improve photovoltaic cell's productivity.

In an embodiment, as shown in fig. 4, in the solar cell of the present invention, there are 9 main grid lines 2, 156 sub-grid lines 3, and 6 segments of back electrodes 5 are disposed on each main grid line 2.

Wherein, compare in the figure of the back of the body electric field structure of the current solar wafer of fig. 1, the utility model discloses increase at the middle part of main grid line 2 and be provided with four fretwork areas, specifically, as shown in fig. 8, the interval is provided with first fretwork area 31 and second fretwork area 32 on third main grid line 2 to and the interval is provided with third fretwork area 33 and fourth fretwork area 34 on seventh main grid line 2, wherein, first fretwork area 31, second fretwork area 32, third fretwork area 33 and fourth fretwork area 34 are positive quadrangle setting, do benefit to the adjustment compensation range of quick definite printing.

Further, the utility model discloses a battery piece still includes, sets up at the battery piece back of the body and corresponds four laser matching blocks in four fretwork district. Specifically, a first laser matching block 35 disposed on the back surface of the cell corresponding to the first hollow area 31, a second laser matching block 36 disposed on the back surface of the cell corresponding to the second hollow area 32, a third laser matching block 37 disposed on the back surface of the cell corresponding to the third hollow area 33, a fourth laser matching block 38 disposed on the back surface of the cell corresponding to the fourth hollow area 34, and corresponding laser matching blocks disposed at positions corresponding to the four hollow areas in the back surface laser opening process pattern shown in fig. 5 are also provided, so that the corresponding laser matching blocks are conveniently etched at the corresponding positions on the back surface of the cell.

In an embodiment, the hollow area and the laser matching block are both square, and the side length of the hollow area is greater than that of the laser matching block at the corresponding position, for example, the side length of the laser matching block may be 1.0mm, and the side length of the hollow area may be 1.1mm, so that a certain interval exists between the laser matching block and the hollow area, which is beneficial to observing the alignment deviation condition, taking the first hollow area 31 as an example, as shown in fig. 9, which is an enlarged schematic diagram of the position of the first hollow area 31, wherein, because the side length of the hollow area is greater than that of the laser matching block, a certain interval exists between the first hollow area 31 and the first laser matching block 35 can be directly observed, and according to the change of the interval, a manufacturer can observe the alignment deviation condition conveniently.

In an embodiment, as shown in fig. 8, a first alignment hole 21 and a second alignment hole 22 are provided in the region of a finger 3 between a first finger 2 and a second finger 2, each of the first alignment hole 21 and the second alignment hole 22 is close to the second finger 2 and is located between the first and the last back electrodes 5 of the second finger 2 and the end far from the border wire 4, for example, 6 back electrodes 5 are included on the second finger 2 in fig. 8, a first alignment hole 21 and a second alignment hole 22 are provided between the first back electrode 5 far from the border wire 4 and the sixth back electrode 5 far from the border wire 4, and the first alignment hole 21 is provided close to the first back electrode 5, the second alignment hole 22 is provided close to the sixth back electrode 5, and a third alignment hole 23 and a fourth alignment hole 24 are provided in the region of the finger 3 between the ninth finger 2 and the eighth finger 2, third counterpoint hole 23 and fourth counterpoint hole 24 all are close to eighth bus bar 2 and are located eighth bus bar 2 head and tail section back electrode 5 and keep away from between the one end of border line 4, for example including 6 sections back electrode 5 on the eighth bus bar 2 in fig. 8, keep away from first section back electrode 5 of border line 4 and keep away from and be provided with third counterpoint hole 23 and fourth counterpoint hole 24 between the sixth section back electrode 5 of border line 4, and third counterpoint hole 23 is close to first section back electrode 5 and sets up, and fourth counterpoint hole 24 is close to sixth section back electrode 5 and sets up. Wherein, the first aligning hole 21, the second aligning hole 22, the third aligning hole 23 and the fourth aligning hole 24 are arranged in a regular quadrangle.

Specifically, for the back laser of the double-sided photovoltaic cell, generally, circular mark points are adopted for the grabbing point alignment printing, however, since the back of the single-sided textured silicon wafer has no textured surface, after etching, more circular bubbles will appear on the back of the silicon wafer, i.e. the edge part of the non-textured surface, and the second camera of the silk screen is easy to grab the bubbles into the mark points, so that the mark points are positioned wrongly to cause printing offset, and in order to solve the problem, the solar cell of the present invention has four alignment holes arranged as shown in fig. 8, i.e. the four alignment holes are respectively close to the corresponding main grid lines 2 and located between the ends of the main grid lines 2 at the head and tail back electrodes 5 far away from the frame lines 4, compared with the back electric field structure of the conventional solar cell shown in fig. 1, by adopting a design mode of integrally moving the four alignment holes inwards, therefore, when single-side texturing is carried out, the circular bubbles on the back surface of the silicon wafer, namely the edge part of the non-textured surface, can be conveniently distinguished, the positions of the four alignment holes can be conveniently identified when the grabbing points are aligned, and the problem of printing offset caused by positioning errors is avoided.

The four alignment holes are integrally moved inwards, so that the requirement that the alignment holes are easy to distinguish from circular bubbles at the edge of a silicon wafer is met on the premise that the functions of the battery piece are not affected, the four alignment holes can be randomly arranged between the first section back electrode 5 and the last section back electrode 5 of the corresponding main grid line 2, namely the first section back electrode 5 and the last section back electrode 5 on the main grid line 2 and one end far away from the frame line 4, and therefore limitation is not made.

It should be understood that, compared with the existing four alignment holes in the double-sided photovoltaic cell back electric field pattern in fig. 1, the embodiment of the present invention only moves the design positions of the four alignment holes integrally to avoid the positioning points from being confused to cause the printing offset.

Further, in the embodiment, a first laser alignment point 25 disposed on the back surface of the cell piece corresponding to the first alignment hole 21, a second laser alignment point 26 disposed on the back surface of the cell piece corresponding to the second alignment hole 22, a third laser alignment point 27 disposed on the back surface of the cell piece corresponding to the third alignment hole 23, a fourth laser alignment point 28 disposed on the back surface of the cell piece corresponding to the fourth alignment hole 24, and corresponding laser alignment points are also disposed at positions corresponding to the four alignment holes in the back surface laser opening process pattern shown in fig. 5, so as to facilitate etching of corresponding laser alignment points at corresponding positions on the back surface of the cell piece.

In an embodiment, each alignment hole is circular, each laser alignment point is circular, and the diameter of each alignment hole is greater than the diameter of each laser alignment point, for example, the diameter of each alignment hole may be 0.8mm, and the diameter of each laser alignment point is 0.6mm, so that a certain interval exists between each laser matching block and each hollowed-out area, and alignment offset can be observed conveniently. Specifically, the battery piece of the present invention adopts the back electric field screen pattern shown in fig. 6, wherein a circular hollow is disposed in each corresponding alignment hole in the back electric field screen pattern, the circular hollow is the circular alignment hole in the battery piece shown in fig. 8, and four circular alignment holes in the battery piece correspond to the laser alignment point in the laser process pattern shown in fig. 5, taking the first alignment hole 21 as an example, as shown in fig. 10, the position of the first alignment hole 21 is enlarged, wherein the blank area is the position of the first alignment hole 21 in the back electric field structure, the first alignment hole 21 is a regular quadrangle, the shape of which is circular, the first laser alignment point 25 exists therein, and the diameter of the first alignment hole 21 is greater than the diameter of the first laser alignment point 25, so that a certain interval exists between the first alignment hole 21 and the first laser alignment point 25, therefore, according to the change of the interval, the alignment deviation condition of the screen printing machine can be observed more conveniently, and the adjustment compensation range of the screen printing machine can be determined quickly and adjusted in time.

Therefore, compared with the existing solar cell back electric field structure pattern shown in fig. 3, the cell of the present invention changes the connection between the two ends of the head and the tail of each main grid line 2 and the reserved back electrode 5 area from thick solid line to double solid line, i.e. the connection is realized by two connecting lines, and the distance between the two connecting lines is 1.06mm, so that after printing, in the double solid line distance area of the head and the tail of the main grid line 2, it can be observed by naked eyes whether the laser opening line 6 and the aluminum grid lines printed on the left and right sides are on one straight line, so that the manufacturer can confirm whether the laser line and the aluminum line are aligned accurately by observing the printed appearance, and by moving the design positions of the four alignment holes inwards as a whole, and adding four hollowed-out areas at the middle positions corresponding to the third main grid line 2 and the seventh main grid line 2, so as to match the alignment deviation situation of the hollowed-out areas corresponding to the main grid line 2 by four laser matching blocks, and the alignment offset condition of the four laser alignment points and the alignment holes at the four corresponding positions is combined, so that a manufacturer can quickly determine the adjustment compensation range of the screen printing and adjust the adjustment compensation range in time.

Summarizing and speaking, according to the utility model discloses a battery piece improves through the design to current solar wafer back of the body electric field structure figure for whether the counterpoint is accurate, simple and efficient can be judged directly through observing the printing outward appearance to the producer of optimizing the battery piece back of the body electric field structure after, and can confirm the adjustment compensation range of screen printing fast and in time make the adjustment, thereby avoid printing the skew, do benefit to and improve the photovoltaic cell productivity.

The utility model discloses a second aspect provides a photovoltaic module 20, as shown in fig. 11, this photovoltaic module 20 includes battery piece array 7, and battery piece array 7 includes the solar wafer that a plurality of above-mentioned embodiments provided.

According to the utility model provides a photovoltaic module 20 adopts the battery piece 1 that above-mentioned embodiment provided through battery piece array 7, and the producer of being convenient for just can confirm whether laser opening line and aluminium grid line are accurate to the position through direct observation back of the body electric field printing outward appearance, does benefit to the adjustment and prints the skew.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A solar cell, comprising:

the cell comprises N main grid lines which are parallel to each other and arranged on the back surface of a cell piece, and a plurality of auxiliary grid lines which are vertically crossed with the main grid lines, wherein two ends of each main grid line and two ends of each auxiliary grid line are connected with a frame line, and a plurality of sections of back electrodes which are sequentially arranged along the extending direction of the main grid lines are arranged on each main grid line;

each of the two end portions of the main grid line, which are connected with the frame line, respectively comprises two connecting lines, and the two connecting lines are arranged in parallel at a preset distance.

2. The solar cell of claim 1, wherein the sum of the widths of the two connecting lines and the preset distance is equal to the width of the main grid line.

3. The solar cell piece according to claim 2, wherein the width of the main grid line is 1.4mm, the width of each of the two connecting lines is 0.17mm, and the preset distance is 1.06 mm.

4. The solar cell sheet according to claim 1, wherein N-9,

the first hollow area and the second hollow area are arranged on the third main grid line at intervals, the third hollow area and the fourth hollow area are arranged on the seventh main grid line at intervals, and the first hollow area, the second hollow area, the third hollow area and the fourth hollow area are arranged in a regular quadrangle.

5. Solar cell sheet according to claim 4,

a first alignment hole and a second alignment hole are formed in an auxiliary grid line region between a first main grid line and a second main grid line, and the first alignment hole and the second alignment hole are close to the second main grid line and are located between the ends, far away from the frame line, of the first back electrode and the second back electrode of the head section and the tail section of the second main grid line;

a third alignment hole and a fourth alignment hole are arranged in an auxiliary grid line region between a ninth main grid line and an eighth main grid line, and the third alignment hole and the fourth alignment hole are both close to the eighth main grid line and are positioned between the ends, far away from the frame line, of the head and tail sections of the eighth main grid line and the back electrode;

the first aligning hole, the second aligning hole, the third aligning hole and the fourth aligning hole are arranged in a regular quadrangle.

6. The solar cell sheet according to claim 5, further comprising: and the four laser matching blocks are arranged on the back of the battery piece and correspond to the four hollow-out areas.

7. The solar cell piece as claimed in claim 6, wherein each of the hollowed-out areas is square, each of the laser matching blocks is square, and the side length of the hollowed-out area is greater than that of the laser matching block at the corresponding position.

8. The solar cell piece as claimed in claim 7, wherein the side length of the laser matching block is 1.0mm, and the side length of the hollow area is 1.1 mm.

9. The solar cell sheet according to claim 6, further comprising: and four laser alignment points which are arranged on the back of the battery piece and correspond to the four alignment holes.

10. The solar cell piece according to claim 9, wherein each of the alignment holes is circular in shape, each of the laser alignment sites is circular in shape, and a diameter of the alignment hole is larger than a diameter of the laser alignment site.

11. A photovoltaic module comprising an array of cells, wherein the array of cells comprises a plurality of solar cells according to any one of claims 1-10.

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