CN217822834U - Laminated tile battery string, photovoltaic module, photovoltaic cell piece and printing steel plate - Google Patents

Abstract

The application provides a shingled battery string, a photovoltaic module, a photovoltaic cell and a printing steel plate, wherein the shingled battery string comprises at least two photovoltaic cells, each photovoltaic cell comprises a cell body, a front main grid line and a back main grid line, the front main grid line extends along a first direction, the back main grid line extends along the direction which is the same as that of the front main grid line, one end of the front main grid line is provided with a first PAD point comprising a first part and a second part, the first part extends along the first direction, the second part is connected to one end of the first part, and the extending direction of the second part is vertical to the first direction; one end of the back main grid line is provided with a second PAD point, the extending direction of which is vertical to the first direction, and the second PAD point and the first PAD point are positioned at two opposite ends of the battery piece body; and a conductive adhesive is arranged between the second part of one photovoltaic cell and the second PAD point of the adjacent photovoltaic cell. The structure enables the overlapping area to be narrower, improves the utilization rate of the photovoltaic cell piece and reduces the consumption of the conductive adhesive.

Description

Laminated tile battery string, photovoltaic module, photovoltaic cell piece and printing steel plate

Technical Field

The application relates to the field of photovoltaic technology, in particular to a shingled battery string, a photovoltaic module, a photovoltaic cell piece and a printing steel plate.

Background

Solar cells, also known as photovoltaic cells, are devices that convert light energy directly into direct current by using the photovoltaic effect, and PN junctions on semiconductors in solar cells can convert solar energy directly into electrical energy by the photovoltaic effect. Among the most common are crystalline silicon solar cells, including single crystalline silicon solar cells and polycrystalline silicon solar cells. Solar cells are generally in the form of sheets, and one side that can absorb light energy and convert it into electrical energy is called the light-absorbing side or front side, and the other side is called the back side. For some solar cells, the back side can also absorb and convert light energy into electrical energy, and these solar cells are called bifacial cells.

Among them, a photovoltaic device which can be used for a long time is obtained by electrically interconnecting a plurality of solar cells and then encapsulating the solar cells in glass or an organic polymer, and is called a photovoltaic module.

The laminated assembly is a photovoltaic assembly formed by adopting the existing cell interconnection mode, the interconnection mode is that one side of one cell is arranged below the other cell, the front grid line electrode of the cell positioned below and the back electrode of the cell positioned above are mutually overlapped, conductive glue is adopted between the two electrodes to form conductive connection, a plurality of cells are sequentially interconnected to form a laminated cell string according to the same method, and then the laminated assembly is arranged on a frame to form the laminated assembly.

However, the width of the overlapping area of the conventional battery cell is large when the battery cells are connected, so that the utilization rate of the battery cell is reduced, and the amount of the conductive adhesive is increased.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a shingled cell string, photovoltaic module, photovoltaic cell piece and printing steel sheet to solve the great problem of width of cell piece overlap region when the lamination is connected.

In a first aspect, the embodiment of the present application provides a laminated cell string, which includes at least two photovoltaic cells;

each photovoltaic cell comprises a cell body, a front main grid line and a back main grid line, wherein the front main grid line is electrically connected to the front of the cell body and extends along a first direction, and the back main grid line is electrically connected to the back of the cell body and extends in the same direction as the front main grid line;

one end of the front main grid line is provided with a first PAD point, the first PAD point comprises a first part and a second part, the first part extends along the first direction, the second part is connected to one end of the first part close to the end part of the battery piece body, and the second part extends along the direction perpendicular to the first direction;

a second PAD point is arranged at one end of the back main grid line, the second PAD point extends along the direction vertical to the first direction, and the second PAD point and the first PAD point are located at two opposite ends of the battery piece body in the first direction;

and adjacent photovoltaic cell pieces are arranged in a laminated manner, and a conductive adhesive is arranged between the second part of one photovoltaic cell piece and the second PAD point of the adjacent photovoltaic cell piece so as to fixedly connect the two adjacent photovoltaic cell pieces.

Optionally, the central axis of the first portion coincides with the front main grid line, and the central axis of the second portion coincides with the front main grid line.

Optionally, the central axis of the second PAD point coincides with the back main gate line.

Optionally, the length of the second portion is between 2.6 mm and 3.2 mm, the width of the second portion is between 0.8 mm and 1.3 mm, and the sum of the length of the first portion and the width of the second portion is between 2.8 mm and 3.0 mm.

Optionally, the length of the second PAD point is between 3.5 mm and 4.1 mm, and the width of the second PAD point is between 0.8 mm and 1.3 mm.

Optionally, the width of the overlapping region between the adjacent photovoltaic cell pieces in the first direction ranges from 0.4 mm to 0.6 mm.

Optionally, the conductive adhesive is of an oval structure and extends in a direction perpendicular to the first direction.

In a second aspect, embodiments of the present application also provide a photovoltaic module including at least one string of shingled cells as described above.

In a third aspect, an embodiment of the present application further provides a photovoltaic cell, where the photovoltaic cell is used for forming a tiled cell string by tiling, the photovoltaic cell includes a cell body, a front main gate line and a back main gate line, the front main gate line is electrically connected to the front of the cell body and extends along a first direction, and the back main gate line is electrically connected to the back of the cell body and extends in the same direction as the front main gate line;

a first PAD point is arranged at one end of the front main grid line and comprises a first part and a second part, and the first part extends along the first direction; the second part is connected to one end of the first part close to the end part of the cell piece body, and extends along the direction perpendicular to the first direction;

one end of the back main grid line is provided with a second PAD point, the second PAD point extends along the direction vertical to the first direction, the second PAD point and the first PAD point are located at two opposite ends of the battery piece body in the first direction, and the second PAD point is provided with conductive adhesive.

In a fourth aspect, the embodiment of the present application further provides a printing steel plate, where the printing steel plate is provided with a printing through hole, and the printing steel plate is used for printing the conductive adhesive in the photovoltaic cell as described above.

The embodiment of the application provides a shingled cell string, photovoltaic module, photovoltaic cell piece and printing steel sheet, wherein, the photovoltaic cell piece can be through the mode of shingled in order to form the shingled cell string, and the photovoltaic cell piece is including the cell piece body that can convert light energy into electric energy, and the electric current that the cell piece body produced can be drawn forth to front main grid line and back main grid line on the cell piece body. When two adjacent photovoltaic cell pieces are laminated, the two adjacent photovoltaic cell pieces are fixedly laminated together and the current conduction is realized through the second part in the first PAD point of one photovoltaic cell piece, the second PAD point of the other photovoltaic cell piece and the connection effect of the conductive adhesive between the second part and the second PAD point. When the photovoltaic cell piece forms a shingled cell string, if welding strips are needed to be welded, welding strips can be more conveniently welded through the first part of the first PAD point so as to conduct current. In addition, through the structural design of the first PAD point and the structural design of the second PAD point, the width of an overlapping area between adjacent photovoltaic cell pieces in the first direction can be effectively reduced, the overlapping area can be made narrower, the utilization rate of the photovoltaic cell pieces is improved, and the using amount of conductive adhesive is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can also be derived from them without inventive effort.

For a more complete understanding of the present application and its advantages, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, wherein like reference numerals represent like parts in the following description.

Fig. 1 is a partially enlarged view of a photovoltaic cell sheet provided in an embodiment of the present application when the photovoltaic cell sheet faces upward.

Fig. 2 is a partially enlarged view of a photovoltaic cell sheet provided in an embodiment of the present application with a back side facing upward.

Fig. 3 is a schematic structural diagram of a photovoltaic cell provided in an embodiment of the present application.

Fig. 4 is a schematic partial structure diagram of a shingled battery string according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a conductive paste provided in an embodiment of the present application.

Fig. 6 is a schematic partial structure diagram of a printing steel plate according to an embodiment of the present application.

Reference numerals:

100. a shingled battery string;

10. a photovoltaic cell sheet; 11. a cell body; 12. a front side main gate line; 13. a back main gate line; 14. a front side secondary grid line; 15. a back side secondary grid line;

16. a first PAD point; 161. a first portion; 162. a second portion;

17. a second PAD point;

18. a conductive adhesive;

200. printing a steel plate; 201. and printing the through holes.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without inventive step, are intended to be within the scope of the present application.

Reference herein to "an embodiment" or "an implementation" means that a particular feature, component, or characteristic described in connection with the embodiment or implementation can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The embodiment of the application provides a shingled cell string, a photovoltaic module, a photovoltaic cell piece and a printing steel plate, so as to solve the problem that the width of an overlapping area of the cell piece is large when the cell pieces are connected in a laminated mode. This will be explained below with reference to the drawings.

Referring to fig. 1 to 4, fig. 1 is a partial enlarged view of a photovoltaic cell provided in an embodiment of the present application with a front side facing upward, fig. 2 is a partial enlarged view of a photovoltaic cell provided in an embodiment of the present application with a back side facing upward, fig. 3 is a schematic structural view of a photovoltaic cell provided in an embodiment of the present application, and fig. 4 is a schematic partial structural view of a shingle cell string provided in an embodiment of the present application. The photovoltaic cell sheet 10 provided by the embodiments of the present application can be used to fabricate a shingled cell string 100, such as a plurality of photovoltaic cell sheets 10 can be tiled to form the shingled cell string 100. The photovoltaic cell 10 includes a cell body 11, a front main grid line 12 and a back main grid line 13, and the cell body 11 is configured to convert light energy into electric energy. It is understood that the cell body 11 may be made of a semiconductor material, such as a P-type silicon wafer, and a P-N junction is formed after phosphorus diffusion. After the semiconductor structure absorbs solar energy, the semiconductor structure is excited to generate electron and hole pairs, the electron and hole pairs are separated by a P-N junction self-establishing electric field in the semiconductor, electrons flow into the N region, holes flow into the P region, and a photo-generated electric field is formed. Generally, the cell body 11 is a sheet structure, which can absorb light energy and convert it into electric energy, and one side facing the light-facing surface when the cell body is normally installed is called light-absorbing surface or front side, and the other side is called back side, although for other cell bodies 11, the back side can also absorb and convert light energy into electric energy, such a cell is called double-sided cell. In the embodiment of the present application, when the battery cell body 11 is mounted in normal use, the side facing upward is referred to as a front side, and the other side facing the front side is referred to as a back side.

The front side of the cell body 11 is electrically connected with a front side main grid line 12, the front side main grid line 12 extends along a first direction H1, the back side of the cell body 11 is electrically connected with a back side main grid line 13, and the extending direction of the back side main grid line 13 is the same as the extending direction of the front side main grid line 12. It can be understood that the front main grid lines 12 and the back main grid lines 13 on the cell body 11 are used for leading out the current generated by the cell body 11. The front main grid lines 12 and the back main grid lines 13 can be arranged on the cell body 11 by screen printing. The number of the front side bus bars 12 may be the same as that of the back side bus bars 13, for example, the number of the front side bus bars 12 and the number of the back side bus bars 13 may be set between 12 and 20 (including 12 and 20), and may be specifically set according to actual conditions. It is also understood that the front side of the cell body 11 may also be provided with front side minor grid lines 14, and the front side minor grid lines 14 are electrically connected to the front side major grid lines 12, such as the front side major grid lines 12 are arranged perpendicular to the front side minor grid lines 14, and the front side minor grid lines 14 are used for collecting current to the front side major grid lines 12. The back side of the cell body 11 may further be provided with a back side sub-grid line 15, the back side sub-grid line 15 is electrically connected to the back side main grid line 13, such as the back side main grid line 13 is perpendicular to the back side sub-grid line 15, and the back side sub-grid line 15 is configured to collect current to the back side main grid line 13.

Wherein, as shown in fig. 4, a plurality of photovoltaic cells 10 can be tiled to form a tiled cell string 100. As can be understood, the shingle refers to a plurality of photovoltaic cell sheets 10 that are stacked in sequence along the length direction or the width direction of the photovoltaic cell sheet 10, and the overlapped portion is a small portion of the end of the photovoltaic cell sheet 10. The present application will be described by taking an example in which a plurality of photovoltaic cells 10 are stacked in order along the first direction H1.

In order to facilitate the tiling connection between the adjacent photovoltaic cells 10 and effectively reduce the width d of the overlapping portion in the first direction H1, please refer to fig. 1 to fig. 4, a first PAD point 16 may be disposed at one end of the front main grid line 12, and it can be understood that the number of the first PAD points 16 may be the same as the number of the front main grid lines 12. The first PAD point 16 includes a first portion 161 and a second portion 162, the first portion 161 extending along the first direction H1, the second portion 162 being connected to an end of the first portion 161 near an end of the cell body 11, and the second portion 162 extending along a direction perpendicular to the first direction H1. A second PAD point 17 is disposed at one end of the back main gate line 13, and the second PAD point 17 extends in a direction perpendicular to the first direction H1, wherein, as shown in fig. 3, the second PAD point 17 and the first PAD point 16 are located at two opposite ends of the cell body 11 in the first direction H1. The adjacent photovoltaic cells 10 are stacked, and a conductive adhesive 18 is disposed between the second portion 162 of one photovoltaic cell 10 and the second PAD point 17 of the adjacent photovoltaic cell 10, so as to fixedly connect the two adjacent photovoltaic cells 10 and realize the conduction of current.

By arranging the first PAD point 16 to include the first portion 161 and the second portion 162, the first portion 161 extends along the first direction, the second portion 162 is connected to an end of the first portion 161 close to the end of the cell body 11, the second portion 162 extends along the direction perpendicular to the first direction H1, and the second PAD point 17 is arranged to extend along the direction perpendicular to the first direction H1, when the photovoltaic cell 10 forms the shingle cell string 100, if solder bonding is required, then the solder bonding can be performed more conveniently by the first portion 161 of the first PAD point 16 to conduct current. Moreover, by the structural design of the first PAD point 16 and the structural design of the second PAD point 17, the width of the overlapping area a between the adjacent photovoltaic cell pieces 10 in the first direction H1 can be effectively reduced, that is, the overlapping area a can be made narrower, the utilization rate of the photovoltaic cell pieces 10 is improved, the amount of the conductive adhesive 18 is reduced, and the power loss of the shingled cell string 100 can be reduced.

For illustration, three photovoltaic cells 10 are taken as an example, and when three photovoltaic cells 10 are stacked, for convenience of understanding, the three photovoltaic cells 10 are respectively named as a first cell, a second cell and a third cell. One side of the first battery piece is arranged below the second battery piece and is partially overlapped and fixed together, so that the second part of the first PAD point at the front main grid line of the first battery piece can be electrically connected with the second PAD point at the back main grid line of the second battery piece under the action of the conductive adhesive. Meanwhile, the third battery piece is arranged below the first battery piece and is partially overlapped and fixed together, so that the second part of the first PAD points at the front main grid line of the third battery piece can be electrically connected with the second PAD points at the back main grid line of the first battery piece under the action of the conductive adhesive. In the same manner, a plurality of photovoltaic cells 10 may be interconnected in sequence to form a shingle string 100.

It is understood that the photovoltaic cell sheet 10 is not limited to three, such as four, five or six.

The first PAD dot 16 and the second PAD dot 17 may be made of silver paste, and for example, the first PAD dot 16 may be printed at one end of the front main gate line 12, and the second PAD dot 17 may be printed at one end of the back main gate line 13 by printing.

In order to make the overlapping area a between the adjacent photovoltaic cell slices 10 narrower and ensure the connection strength and the electrical conduction efficiency between the adjacent photovoltaic cell slices 10, the first portion 161 of the first PAD point 16 is arranged such that the central axis of the first portion 161 coincides with the front main grid line 12, and the second portion 162 is arranged such that the central axis of the second portion 162 coincides with the front main grid line 12. As such, the first PAD dots 16 formed by the first and second portions 161 and 162 form a structure like an inverted "T" shape and are symmetrical with respect to the front bus bar 12, taking the viewing angle in fig. 1 as a reference.

The second PAD point 17 is disposed such that a central axis of the second PAD point 17 coincides with the back main gate line 13. The first PAD points 16 and the second PAD points 17 thus arranged can ensure the connection strength and the electrical conduction efficiency between the adjacent photovoltaic cell sheets 10 while making the overlapping area a between the adjacent photovoltaic cell sheets 10 narrower.

In some embodiments, referring to fig. 1, the length L1 of the second portion 162 may be set between 2.6 mm and 3.2 mm, such as the length L1 of the second portion 162 may be set to 2.6 mm, 2.9 mm or 3.2 mm. The width D1 of the second portion 162 may be set between 0.8 mm and 1.3 mm, such as the width D1 of the second portion 162 may be set to 0.8 mm or 1 mm or 1.3 mm.

The sum L of the length of the first portion 161 and the width of the second portion 162 may be set between 2.8 mm and 3.0 mm. For example, the sum L of the length of the first portion 161 and the width of the second portion 162 may be set to 2.8 mm or 3.0 mm.

As shown in fig. 2, the length L2 of the second PAD point 17 can be set between 3.5 mm and 4.1 mm, such as the length L2 of the second PAD point 17 can be set between 3.5 mm or 3.8 mm or 4.1 mm, the width D2 of the second PAD point 17 can be set between 0.8 mm and 1.3 mm, such as the width D2 of the second PAD point 17 can be set between 0.8 mm or 1 mm or 1.3 mm.

As such, the width range d of the overlapping area a between the adjacent photovoltaic cell sheets 10 in the first direction H1 may be set between 0.4 mm and 0.6 mm. The connection strength between the adjacent photovoltaic cell pieces 10 is ensured, the utilization rate of the photovoltaic cell pieces 10 is improved, and the consumption of the conductive adhesive 18 is reduced.

It can be understood that, the second portion 162 of one photovoltaic cell 10 and the second PAD point 17 of the adjacent photovoltaic cell 10 are fixedly connected together by disposing the conductive adhesive 18, and in order to improve the connection strength and prevent the conductive adhesive 18 from overflowing, please refer to fig. 5 in combination with fig. 2, and fig. 5 is a schematic structural diagram of the conductive adhesive provided in the embodiment of the present application. The conductive paste 18 may be formed in an oval structure, and the conductive paste 18 extends in a direction perpendicular to the first direction H1, that is, the extending direction of the conductive paste 18 is the same as the extending direction of the second PAD point 17.

The length L3 of the conductive paste 18 may be set between 2.8 mm and 3.5 mm, such as the length L3 of the conductive paste 18 may be set to 2.8 mm or 3.1 mm or 3.5 mm. The width D3 of the conductive paste 18 may be set between 0.3 mm and 0.35 mm, such as the width D3 of the conductive paste 18 may be set to 0.3 mm or 0.35 mm.

In the photovoltaic cell sheet 10, as shown in fig. 3, in order to facilitate printing of the conductive paste 18 when the photovoltaic cell sheet 10 is fabricated into the shingled cell string 100, the conductive paste 18 may be disposed on the second PAD points 17 in the photovoltaic cell sheet 10, and the second PAD points 17 facilitate printing of the conductive paste 18. The thickness of the conductive adhesive 18 can be set between 50 micrometers and 150 micrometers, and at this time, the current conduction effect is good and the pasting effect is also good.

It is understood that, in order to facilitate printing the conductive paste 18 on the second PAD dot 17, a printing steel plate 200 may be used for printing, wherein, as shown in fig. 6, fig. 6 is a partial structural schematic diagram of the printing steel plate provided in the embodiment of the present application. The printing steel plate 200 is provided with a printing through hole 201, and the shape and size of the printing through hole 201 correspond to those of the conductive paste 18 to be printed.

On the other hand, the embodiment of the present application further provides a photovoltaic module, it can be understood that the photovoltaic module includes at least one of the above shingle cell strings 100, and it can be understood that each shingle cell string 100 may be electrically connected in parallel or in series, and may be specifically configured according to actual needs.

It should be noted that the terms "first", "second", and the like in the description and claims of the present application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order, and are not intended to indicate or imply relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The shingled cell string, the photovoltaic module, the photovoltaic cell sheet and the printed steel plate provided in the embodiment of the present application are described in detail above, and a specific example is applied in the present application to explain the principle and the embodiment of the present application, and the description of the above embodiment is only used to help understanding the method and the core concept of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A shingled cell string is characterized by comprising at least two photovoltaic cells;

each photovoltaic cell comprises a cell body, a front main grid line and a back main grid line, wherein the front main grid line is electrically connected to the front of the cell body and extends along a first direction, and the back main grid line is electrically connected to the back of the cell body and extends in the same direction as the front main grid line;

one end of the front main grid line is provided with a first PAD point, the first PAD point comprises a first part and a second part, the first part extends along the first direction, the second part is connected to one end of the first part close to the end part of the battery piece body, and the second part extends along the direction perpendicular to the first direction;

a second PAD point is arranged at one end of the back main grid line, the second PAD point extends along the direction vertical to the first direction, and the second PAD point and the first PAD point are located at two opposite ends of the battery piece body in the first direction;

and the adjacent photovoltaic cell pieces are arranged in a laminated manner, and a conductive adhesive is arranged between the second part of one photovoltaic cell piece and the second PAD point of the adjacent photovoltaic cell piece so as to fixedly connect the two adjacent photovoltaic cell pieces.

2. The shingle battery string as recited in claim 1, wherein the central axis of the first portion is coincident with the front major grid lines and the central axis of the second portion is coincident with the front major grid lines.

3. The string of stacked cells of claim 1, wherein a central axis of the second PAD point coincides with the back busbar.

4. The string of shingle cells according to any of claims 1-3, wherein the length of the second portion is between 2.6 mm and 3.2 mm, the width of the second portion is between 0.8 mm and 1.3 mm, and the sum of the length of the first portion and the width of the second portion is between 2.8 mm and 3.0 mm.

5. The string of stacked-tile cells of claim 4, wherein the length of the second PAD spot is between 3.5 millimeters and 4.1 millimeters and the width of the second PAD spot is between 0.8 millimeters and 1.3 millimeters.

6. The shingle string as recited in claim 1, wherein the width of the overlap region between adjacent photovoltaic cell sheets in the first direction ranges between 0.4 mm and 0.6 mm.

7. The string of shingled cells according to claim 1, wherein the conductive adhesive is oval in configuration and extends in a direction perpendicular to the first direction.

8. A photovoltaic module comprising at least one string of shingled cells according to any of claims 1 to 7.

9. A photovoltaic cell piece is used for forming a tiled cell string in a tiling mode and is characterized by comprising a cell piece body, a front main grid line and a back main grid line, wherein the front main grid line is electrically connected to the front of the cell piece body and extends along a first direction, the back main grid line is electrically connected to the back of the cell piece body, and the extending direction of the back main grid line is the same as the extending direction of the front main grid line;

a first PAD point is arranged at one end of the front main grid line and comprises a first part and a second part, and the first part extends along the first direction; the second part is connected to one end of the first part close to the end part of the cell piece body, and extends along the direction perpendicular to the first direction;

one end of the back main grid line is provided with a second PAD point, the second PAD point extends along the direction vertical to the first direction, the second PAD point and the first PAD point are located at two opposite ends of the battery piece body in the first direction, and the second PAD point is provided with conductive adhesive.

10. A printed steel sheet, characterized in that the printed steel sheet is provided with printed through holes, and the printed steel sheet is used for printing the conductive adhesive in the photovoltaic cell sheet according to claim 9.

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