Solar cell, mother set structure thereof, cell assembly and photovoltaic system

Abstract

The utility model discloses a solar cell and a mother set structure thereof, a cell assembly and a photovoltaic system, and the solar cell comprises a substrate which comprises a first surface and a second surface which are oppositely arranged; the first doped layers and the second doped layers are alternately arranged on the first surface, the first doped layers and the adjacent second doped layers are spaced by isolation regions, and the conduction type of the first doped layers is different from that of the second doped layers; the third doping layer is located on the side, away from the substrate, of the first doping layer, the conduction type of the third doping layer is the same as that of the second doping layer, and the third doping layer is arranged on the edge of the solar cell. The reliability of the solar cell can be effectively improved, and the preparation cost of the solar cell is reduced.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a solar cell and its master structure, a cell module and a photovoltaic system. Background Technology

[0002] A back-contact solar cell is a type of cell in which both its positive and negative electrodes are placed on the back (non-light-receiving surface) of the cell. The light-receiving surface of the cell is not blocked by any metal electrodes, thereby effectively increasing the effective light-receiving area of ​​the cell.

[0003] The doped layers around the back of a BC solar cell require laser printing to form alignment marks. However, laser printing introduces stress, causing stress damage to the BC solar cell and reducing its reliability. Furthermore, laser printing is expensive, increasing the overall manufacturing cost of BC cells. Utility Model Content

[0004] This invention provides a solar cell and its master structure, a battery module, and a photovoltaic system to solve the problem that laser printing introduces stress, causing stress damage to BC solar cells and reducing their reliability, as well as the problem that laser printing is expensive, increasing the manufacturing cost of BC solar cells.

[0005] In a first aspect, this utility model provides a solar cell, wherein the solar cell comprises:

[0006] The substrate includes a first surface and a second surface disposed opposite to each other.

[0007] A first doped layer and a second doped layer are alternately arranged on the first surface, with an isolation region separating the first doped layer from the adjacent second doped layer. The first doped layer has a different conductivity type than the second doped layer.

[0008] The third doped layer is located on the side of the first doped layer away from the substrate. The conductivity type of the third doped layer is the same as that of the second doped layer. The third doped layer is disposed at the edge of the solar cell.

[0009] Optionally, the solar cell also includes electrodes, with electrodes disposed between two adjacent third doped layers.

[0010] Optionally, the solar cell also includes an electrode, with a third doped layer located on one side of the electrode.

[0011] Optionally, the vertical projection of the third doped layer onto the substrate and the vertical projection of the electrode onto the substrate overlap in at least a partial area.

[0012] Optionally, the vertical projection of the third doped layer onto the substrate and the vertical projection of the electrode onto the substrate do not overlap.

[0013] Optionally, at least one side of the electrode is provided with a plurality of spaced third doped layers.

[0014] Optionally, a plurality of spaced third doped layers are provided on one side of the electrode.

[0015] Optionally, the third doped layer is disposed in the chamfer region of the solar cell.

[0016] Optionally, the conductivity type of the first doped layer is different from that of the substrate, while the conductivity type of the second doped layer is the same as that of the substrate.

[0017] Optionally, the third doped layer and the second doped layer are located in the same layer.

[0018] Optionally, the vertical projected area of ​​the third doped layer on the substrate is less than or equal to the vertical projected area of ​​the first doped layer on the substrate.

[0019] Secondly, this utility model provides a solar cell master structure, wherein the solar cell master structure includes the solar cell provided in the first aspect above, and a cutting channel is provided between two adjacent solar cells;

[0020] The third doped layer is located at the edge of the solar cell master structure.

[0021] Optionally, the third doped layer of two adjacent solar cells is asymmetrically arranged with respect to the cut line between the two solar cells.

[0022] Optionally, the third doped layers of two adjacent solar cells are symmetrically arranged about the cut line between the two solar cells.

[0023] Thirdly, this utility model provides a battery assembly, wherein the battery assembly includes the solar cell provided in the first aspect and the solar cell master structure provided in the second aspect.

[0024] Fourthly, this utility model provides a photovoltaic system, wherein the photovoltaic system includes the battery module provided in the third aspect above.

[0025] The technical solution of this embodiment of the invention involves a third doped layer disposed on the side of the first doped layer away from the first surface. The conductivity type of the third doped layer differs from that of the first doped layer. This third doped layer can serve as an alignment mark layer, used during the fabrication of solar cells to achieve high-precision alignment of multiple layers such as electrodes (not shown), passivation layers (not shown), and isolation regions. It can also be used for position calibration during processes such as doping, photolithography, and etching. Furthermore, it can serve as a reference for cutting the solar cell master structure and assembling the modules. The third doped layer eliminates the need for laser printing to form alignment marks around the first surface, thus preventing stress and stress damage to the solar cell, effectively improving its reliability and reducing its fabrication cost. Simultaneously, the third doped layer can act as an edge protection layer for the solar cell, effectively mitigating edge stress and further enhancing its reliability.

[0026] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a solar cell provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of another solar cell structure provided in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of another solar cell provided in this embodiment of the present invention;

[0031] Figure 4 This is a top view of a solar cell provided in an embodiment of the present invention;

[0032] Figure 5 This is a top view of another solar cell provided in an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of another solar cell provided in this embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of another solar cell provided in this embodiment of the present invention;

[0035] Figure 8 This is a top view of yet another solar cell provided in this embodiment of the present invention;

[0036] Figure 9 This is a top view of a first doped layer, a second doped layer, and an isolation region provided in an embodiment of the present invention;

[0037] Figure 10 This is a schematic diagram of a solar cell master structure provided in an embodiment of the present invention. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] Figure 1 This is a schematic diagram of the structure of a solar cell provided in an embodiment of this utility model, as shown below. Figure 1As shown, the solar cell includes: a substrate 10, which includes a first surface 101 and a second surface 102 disposed opposite to each other. A first doped layer 11 and a second doped layer 12 are alternately arranged on the first surface 101, with the first doped layer 11 separated from the adjacent second doped layer 12 by an isolation region 14. The conductivity type of the first doped layer 11 and the conductivity type of the second doped layer 12 are different. A third doped layer 13 is located on the side of the first doped layer 11 away from the substrate 10, and the conductivity type of the third doped layer 13 is the same as that of the second doped layer 12. The third doped layer 13 is disposed at the edge of the solar cell.

[0041] Specifically, the substrate 10 includes a first surface 101 and a second surface 102. For example, the first surface 101 can be the back side (non-light-receiving surface), and the second surface 102 can be the front side (light-receiving surface).

[0042] A first doped layer 11 and a second doped layer 12 are alternately arranged along a first direction X on the first surface 101, and the first doped layer 11 and the second doped layer 12 have different doping types. The first direction X is the direction in which the first doped layer 11 points towards the isolation region 14.

[0043] The first doped layer 11 and the substrate 10 have different doping types, while the second doped layer 12 has the same doping type as the substrate 10, and the doping concentration of the second doped layer 12 is greater than that of the substrate 10. For example, the substrate 10 can be an N-type substrate, the first doped layer 11 can be a P-type doped layer, and the second doped layer 12 can be an N-type doped layer. Alternatively, the substrate 10 can be a P-type substrate, the first doped layer 11 can be an N-type doped layer, and the second doped layer 12 can be a P-type doped layer.

[0044] In some embodiments of this invention, the doping types of the second doped layer 12 and the substrate 10 may be different, while the doping types of the first doped layer 11 and the substrate 10 may be the same, and the doping concentration of the first doped layer 11 may be greater than that of the substrate 10. For example, the substrate 10 may be an N-type substrate, the first doped layer 11 may be an N-type doped layer, and the second doped layer 12 may be a P-type doped layer. Alternatively, the substrate 10 may be a P-type substrate, the first doped layer 11 may be a P-type doped layer, and the second doped layer 12 may be an N-type doped layer.

[0045] The third doped layer 13 can be disposed on the side of the first doped layer 11 around the first surface 101 away from the first surface 101, and the vertical projection of the third doped layer 13 on the first surface 101 can coincide with the vertical projection of the first doped layer 11 around the first surface 101. In some embodiments of the present invention, the vertical projection of the third doped layer 13 on the first surface 101 can be within the vertical projection of the first doped layer 11 around the first surface 101. The side of the first doped layer 11 around the first surface 101 away from the first surface 101 can include a plurality of spaced-apart third doped layers 13, which can be spaced along a first direction X or a second direction Y, where the second direction Y is the direction in which the first doped layer 11 extends.

[0046] The third doped layer 13 has a different conductivity type than the first doped layer 11, but the same conductivity type as the second doped layer 12. Optionally, an isolation layer (not shown in the figure) can be provided between the first doped layer 11 and the third doped layer 13 around the first surface 101. For example, the isolation layer may include a borosilicate glass layer or a phosphosilicate glass layer, etc.

[0047] In this embodiment of the invention, a third doped layer 13 is provided on the side of the first doped layer 11 away from the first surface 101. The conductivity type of the third doped layer 13 is different from that of the first doped layer 11. The third doped layer 13 can serve as an alignment mark layer, used to achieve high-precision alignment of multiple layers such as electrodes (not shown in the figure), passivation layers (not shown in the figure), and isolation regions 14 during the fabrication of solar cells. It can also be used for position calibration of processes such as doping, photolithography, and etching, and can also serve as a reference for cutting the solar cell master structure and splicing the modules. The provision of the third doped layer 13 eliminates the need for laser printing to form alignment marks around the first surface 101, thus avoiding stress and preventing stress damage to the solar cell, effectively improving the reliability of the solar cell and reducing its fabrication cost. Simultaneously, the third doped layer 13 can serve as an edge protection layer for the solar cell, effectively improving edge stress and further enhancing its reliability.

[0048] Optionally, based on the above embodiments, Figure 2 This is a schematic diagram of another solar cell structure provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of another type of solar cell provided in this embodiment of the present invention, as shown below. Figure 2 and Figure 3 As shown, the solar cell also includes an electrode 15, which is disposed between two adjacent third doped layers 13.

[0049] Specifically, the solar cell may also include an electrode 15. An electrode 15 may be disposed on the side of the first doped layer 11 away from the first surface 101. The electrode 15 is used to extract the electrical signal of the first doped layer 11. An electrode (not shown in the figure) may also be disposed on the side of the second doped layer 12 away from the first surface 101 for extracting the electrical signal. When the first doped layer 11 is an N-type doped layer and the second doped layer 12 is a P-type doped layer, the electrode 15 on the side of the first doped layer 11 away from the first surface 101 can serve as the negative electrode of the solar cell to collect electrons from the first doped layer 11. The electrode on the side of the second doped layer 12 away from the first surface 101 can serve as the positive electrode of the solar cell to collect holes from the second doped layer 12. When the first doped layer 11 is a P-type doped layer and the second doped layer 12 is an N-type doped layer, the electrode 15 on the side of the first doped layer 11 away from the first surface 101 can be used as the positive electrode of the solar cell to collect the holes of the first doped layer 11, and the electrode on the side of the second doped layer 12 away from the first surface 101 can be used as the negative electrode of the solar cell to collect the electrons of the second doped layer 12.

[0050] like Figure 2 and Figure 3 As shown, the third doped layers 13 located on the side of the first doped layer 11 away from the first surface 101 can be spaced apart along a first direction X, where the first direction X is the direction from the first doped layer 11 to the second doped layer 12. The electrode 15 on the side of the first doped layer 11 away from the first surface 101 can be located between the two third doped layers 13. Figure 2 As shown, the electrode 15 located between two adjacent third doped layers 13 can extend to a portion or the entire surface of the third doped layer 13 on the side away from the first surface 101. Figure 3 As shown, the electrode 15 located between two adjacent third doped layers 13 may not extend to the side of the third doped layer 13 away from the first surface 101.

[0051] Figure 4 This is a top view of a solar cell provided in an embodiment of the present invention. Figure 5 This is a top view of another solar cell provided in an embodiment of the present invention, as shown below. Figure 4 and Figure 5 As shown, the third doped layers 13 located on the side of the first doped layer 11 away from the first surface 101 can be arranged at intervals, and the electrode 15 on the side of the first doped layer 11 away from the first surface 101 can be located between the two third doped layers 13.

[0052] With the above configuration, the solar cell can include multiple spaced-apart third doped layers 13. These third doped layers 13 can serve as alignment marker layers, used during solar cell fabrication to achieve high-precision alignment of multiple layers such as electrodes (not shown), passivation layers (not shown), and isolation regions 14. They can also be used for positional calibration during doping, photolithography, and etching processes, and serve as a reference for cutting the solar cell master structure and assembling modules. The third doped layer 13 eliminates the need for laser printing alignment markers around the first surface 101, thus avoiding stress and preventing stress damage to the solar cell, effectively improving its reliability and reducing fabrication costs. Simultaneously, the third doped layer 13 can serve as an edge protection layer for the solar cell, effectively mitigating edge stress and further improving its reliability. The multiple spaced-apart third doped layers 13 can further improve the fabrication precision of the solar cell. Figure 5 An electrode 16 is shown located on the side of the second doped layer 12 away from the first surface 101. The electrode 16 is used to extract electrical signals from the second doped layer 12. An isolation region 14 is used to insulate the first doped layer 11 and the second doped layer 12.

[0053] Optionally, based on the above embodiments, Figure 6 This is a schematic diagram of another type of solar cell provided in this embodiment of the present invention. Figure 7 This is a schematic diagram of another type of solar cell provided in this embodiment of the present invention, as shown below. Figures 6-7 As shown, the solar cell also includes an electrode 15, and a third doped layer 13 is located on one side of the electrode 15.

[0054] Specifically, the electrode 15 on the side of the first doped layer 11 away from the first surface 101 can be located on the side of the third doped layer 13 close to or away from the isolation region 14. The electrode 15 on the side of the first doped layer 11 away from the first surface 101 can also extend to a portion or the entire surface of the third doped layer 13 away from the first surface 101.

[0055] With the above configuration, the third doped layer 13 can serve as an alignment mark layer, used to achieve high-precision alignment of multiple layers such as electrodes (not shown in the figure), passivation layers (not shown in the figure), and isolation regions 14 during the fabrication of solar cells. It can also be used for positional calibration during processes such as doping, photolithography, and etching, and as a reference for cutting the solar cell master structure and assembling modules. The third doped layer 13 eliminates the need for laser printing to form alignment marks around the first surface 101, thus avoiding stress and preventing stress damage to the solar cell, effectively improving its reliability and reducing its fabrication cost. Simultaneously, the third doped layer 13 can serve as an edge protection layer for the solar cell, effectively mitigating edge stress and further enhancing its reliability.

[0056] Optionally, based on the above embodiments, refer to... Figure 2 and Figure 7 The vertical projection of the third doped layer 13 onto the substrate 10 and the vertical projection of the electrode 15 onto the substrate 10 overlap in at least a partial area.

[0057] Specifically, such as Figure 2 As shown, the electrode 15 on the side of the first doped layer 11 away from the first surface 101 can be located between two adjacent third doped layers 13. The electrode 15 located between two adjacent third doped layers 13 can extend to a portion or the entire surface of the third doped layer 13 away from the first surface 101, thereby causing the vertical projection of the third doped layer 13 on the first surface 101 and the vertical projection of the electrode 15 on the side of the first doped layer 11 away from the first surface 101 to partially or completely overlap on the first surface 101.

[0058] like Figure 7 As shown, the electrode 15 on the side of the first doped layer 11 away from the first surface 101 can be located on the side of the third doped layer 13 near or away from the isolation region 14. The electrode 15 on the side of the first doped layer 11 away from the first surface 101 can extend to a portion or the entire surface of the third doped layer 13 away from the first surface 101. This results in a partial or complete overlap between the vertical projection of the third doped layer 13 onto the first surface 101 and the vertical projection of the electrode 15 on the side of the first doped layer 11 away from the first surface 101 onto the first surface 101.

[0059] Optionally, based on the above embodiments, refer to... Figure 3 and Figure 6 The vertical projection of the third doped layer 13 onto the substrate 10 and the vertical projection of the electrode 15 onto the substrate 10 do not overlap.

[0060] Specifically, such as Figure 3As shown, the electrode 15 on the side of the first doped layer 11 away from the first surface 101 can be located between two adjacent third doped layers 13. The electrode 15 located between two adjacent third doped layers 13 may not extend to part or the entire surface of the third doped layer 13 away from the first surface 101, so that the vertical projection of the third doped layer 13 on the first surface 101 and the vertical projection of the electrode 15 on the side of the first doped layer 11 away from the first surface 101 on the first surface 101 do not overlap.

[0061] like Figure 6 As shown, the electrode 15 on the side of the first doped layer 11 away from the first surface 101 can be located on the side of the third doped layer 13 close to or away from the isolation region 14. The electrode 15 on the side of the first doped layer 11 away from the first surface 101 may not extend to part or the entire surface of the third doped layer 13 away from the first surface 101, thereby ensuring that the vertical projection of the third doped layer 13 on the first surface 101 and the vertical projection of the electrode 15 on the side of the first doped layer 11 away from the first surface 101 do not overlap on the first surface 101.

[0062] Optionally, based on the above embodiments, Figure 8 This is a top view of another solar cell provided in this embodiment of the present invention, as shown below. Figure 5 and Figure 8 As shown, at least one side of electrode 15 is provided with a plurality of spaced third doped layers 13.

[0063] Specifically, the electrode 15 on the side of the first doped layer 11 away from the first surface can be located between two adjacent third doped layers 13 spaced apart along the first direction X, or the electrode 15 on the side of the first doped layer 11 away from the first surface can be located on one side of the third doped layer 13. The third doped layers 13 on one or both sides of the electrode 15 on the side of the first doped layer 11 away from the first surface can be spaced apart along the second direction Y. In some embodiments of this utility model, the third doped layers 13 on one or both sides of the electrode 15 on the side of the first doped layer 11 away from the first surface can be spaced apart along the first direction X.

[0064] With the above configuration, the solar cell can include multiple spaced-apart third doped layers 13. These third doped layers 13 can serve as alignment marker layers, enabling high-precision alignment of multiple layers such as electrodes (not shown), passivation layers (not shown), and isolation regions 14 during solar cell fabrication. They can also be used for positional calibration during doping, photolithography, and etching processes, and serve as a reference for cutting the solar cell master structure and assembling modules. The placement of the third doped layers 13 eliminates the need for laser printing alignment marks around the first surface, thus preventing stress and stress damage to the solar cell, effectively improving its reliability and reducing fabrication costs. Simultaneously, the third doped layers 13 can serve as edge protection layers, effectively mitigating edge stress and further enhancing reliability. The multiple spaced-apart third doped layers 13 can further improve the fabrication precision of the solar cell.

[0065] Optionally, based on the above embodiments, refer to... Figure 8 The third doped layer 13 is disposed in the chamfered region AA of the solar cell.

[0066] Specifically, the third doped layer 13 can be disposed in the chamfered region AA of the solar cell. The third doped layer 13 can serve as an alignment mark layer, used during the fabrication of the solar cell to achieve high-precision alignment of multiple layers such as electrodes (not shown in the figure), passivation layers (not shown in the figure), and isolation regions 14. It can also be used for position calibration during processes such as doping, photolithography, and etching, and can serve as a reference for cutting the solar cell master structure and splicing the modules. The placement of the third doped layer 13 eliminates the need for laser printing to form alignment marks around the perimeter of the first surface, thus avoiding stress and preventing stress damage to the solar cell, effectively improving its reliability and reducing its fabrication cost. Simultaneously, the third doped layer 13 can serve as an edge protection layer for the solar cell, effectively mitigating edge stress and further enhancing its reliability.

[0067] Understandably, placing the third doped layer 13 in the chamfer region AA can further reduce the difficulty of position calibration and improve the alignment accuracy.

[0068] Optionally, based on the above embodiments, refer to... Figures 1-8 The conductivity type of the first doped layer 11 is different from that of the substrate 10, while the conductivity type of the second doped layer 12 is the same as that of the substrate 10.

[0069] Specifically, the first doped layer 11 and the substrate 10 have different doping types, while the second doped layer 12 has the same doping type as the substrate 10, and the doping concentration of the second doped layer 12 is greater than that of the substrate 10. For example, the substrate 10 can be an N-type substrate, the first doped layer 11 can be a P-type doped layer, and the second doped layer 12 can be an N-type doped layer. Alternatively, the substrate 10 can be a P-type substrate, the first doped layer 11 can be an N-type doped layer, and the second doped layer 12 can be a P-type doped layer.

[0070] Optionally, based on the above embodiments, refer to... Figures 1-8 The third doped layer 13 and the second doped layer 12 are located in the same layer.

[0071] Specifically, the material and conductivity type of the third doped layer 13 and the second doped layer 12 can be the same, and the third doped layer 13 and the second doped layer 12 can be formed simultaneously. This arrangement can further simplify the fabrication process of solar cells.

[0072] Optionally, based on the above embodiments, refer to... Figures 1-8 The vertical projection area of ​​the third doped layer 13 on the substrate 10 is less than or equal to the vertical projection area of ​​the first doped layer 11 on the substrate 10.

[0073] Specifically, such as Figure 1 As shown, the vertical projected area of ​​the third doped layer 13 on the substrate 10 is equal to the vertical projected area of ​​the first doped layer 11 on the substrate 10. Figures 2-8 As shown, the vertical projected area of ​​the third doped layer 13 on the substrate 10 is smaller than that of the first doped layer 11 on the substrate 10. It is understood that the smaller vertical projected area of ​​the third doped layer 13 on the substrate 10 reduces the area of ​​the leakage region, thereby reducing the risk of short circuits. The third doped layer 13 can serve as an alignment mark layer, used in the fabrication of solar cells to achieve high-precision alignment of multiple layers such as electrodes (not shown), passivation layers (not shown), and isolation regions 14. It can also be used for position calibration during processes such as doping, photolithography, and etching, and as a reference for cutting the solar cell master structure and splicing modules. The third doped layer 13 eliminates the need for laser printing to form alignment marks around the first surface 101, thus avoiding stress and preventing stress damage to the solar cell, effectively improving its reliability and reducing its fabrication cost. Simultaneously, the third doped layer 13 can serve as an edge protection layer for the solar cell, effectively mitigating edge stress and further improving its reliability.

[0074] Optionally, based on the above embodiments, Figure 9This is a top view of a first doped layer, a second doped layer, and an isolation region provided in an embodiment of this utility model, as shown below. Figure 9 As shown, the first doped layer 11 and the second doped layer 12 are arranged alternately in an interdigitated manner on the first surface.

[0075] Specifically, the first doped layer 11 and the second doped layer 12 can be arranged alternately in an interdigitated manner on the first surface. The electrode on the side of the first doped layer 11 away from the first surface and the third doped layer can be arranged on the side of the first doped layer 11 away from the first surface according to the arrangement provided in any of the above embodiments of the present invention, which has the beneficial effects of the arrangement provided in any of the above embodiments of the present invention.

[0076] Optionally, based on the above embodiments, Figure 10 This is a schematic diagram of a solar cell master structure provided in an embodiment of the present invention. The solar cell master structure includes at least two solar cells provided in any of the above embodiments of the present invention, and a cutting channel 20 is provided between two adjacent solar cells. The third doped layer is located at the edge of the solar cell master structure.

[0077] Specifically, the third doped layer in a solar cell can be located at the edge of the solar cell master structure. The third doped layer can serve as a reference for cutting the solar cell master structure and splicing the modules. Different solar cells in the solar cell master structure can be distinguished by the third doped layer.

[0078] The positional relationship of the third doped layer between two adjacent solar cells in the solar cell master structure can include:

[0079] Optionally, such as Figure 10 As shown, the third doped layer of two adjacent solar cells is asymmetrically arranged with respect to the cut 20 between the two solar cells.

[0080] Specifically, such as Figure 10 As shown, the third doped layer of two adjacent solar cells is asymmetrically arranged with respect to the cutting channel 20 between the two solar cells. The third doped layer of two adjacent solar cells can be set in regions A1 and A2 of the solar cell master structure. The third doped layer can serve as a reference for cutting the solar cell master structure and splicing the modules. Different solar cells in the solar cell master structure can be distinguished by the third doped layer.

[0081] Optionally, such as Figure 10 As shown, the third doped layer of two adjacent solar cells is symmetrically arranged about the cut line between the two solar cells.

[0082] Specifically, such as Figure 10As shown, the third doped layer of two adjacent solar cells is symmetrically arranged about the cutting channel 20 between the two solar cells. The third doped layer of two adjacent solar cells can be set in the A1 region and A3 region of the solar cell master structure. The third doped layer can serve as a reference for cutting the solar cell master structure and splicing the modules. Different solar cells in the solar cell master structure can be distinguished by the third doped layer.

[0083] It should be noted that the third doped layer of two adjacent solar cells can be symmetrically or asymmetrically arranged with respect to the cutting channel 20 between the two solar cells, as long as each solar cell can be distinguished by the third doped layer located at the edge of the solar cell mother structure after the solar cell mother structure is cut off along the cutting channel.

[0084] This utility model provides a battery assembly, wherein the battery assembly includes any solar cell provided in any of the above embodiments of this utility model, and has the beneficial effects of any solar cell provided in any of the above embodiments of this utility model.

[0085] This utility model provides a photovoltaic system, wherein the photovoltaic system includes the battery module provided in the above embodiments of this utility model and has the beneficial effects of the battery module provided in the above embodiments of this utility model. Since the battery module provided in this utility model has the beneficial effects of any solar cell provided in any of the above embodiments of this utility model, the photovoltaic system provided in this utility model has the beneficial effects of any solar cell provided in any of the above embodiments of this utility model.

[0086] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0087] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A solar cell, characterized by, The solar cell comprises: a substrate comprising a first surface and a second surface oppositely arranged; first doped layers and second doped layers alternately arranged on the first surface, the first doped layers and the adjacent second doped layers are separated by an isolation region, the first doped layers and the second doped layers have different conductive types; a third doped layer on the side of the first doped layer away from the substrate, the third doped layer has the same conductive type as the second doped layer, and the third doped layer is arranged at the edge of the solar cell.

2. The solar cell according to claim 1, characterized in that, The solar cell further comprises an electrode, and the electrode is arranged between two adjacent third doped layers.

3. The solar cell according to claim 1, characterized in that, The solar cell further comprises an electrode, and the third doped layer is arranged on one side of the electrode.

4. The solar cell according to claim 2 or 3, characterized in that, The third doped layer and the electrode at least partially overlap in the vertical projection of the substrate.

5. The solar cell according to claim 2 or 3, characterized in that, The third doped layer and the electrode do not overlap in the vertical projection of the substrate.

6. The solar cell of claim 2, wherein, At least one side of the electrode is provided with a plurality of third doped layers arranged at intervals.

7. The solar cell of claim 3, wherein One side of the electrode is provided with a plurality of third doped layers arranged at intervals.

8. The solar cell of claim 1, wherein, The third doped layer is arranged in a chamfer region of the solar cell.

9. The solar cell of claim 1, wherein, The first doped layer has a different conductive type from the substrate, and the second doped layer has the same conductive type as the substrate.

10. The solar cell of claim 1, wherein, The third doped layer and the second doped layer are in the same layer.

11. The solar cell of claim 1, wherein, The third doped layer has a vertical projection area on the substrate smaller than or equal to the vertical projection area of the first doped layer on the substrate.

12. A solar cell master structure, characterized by, The solar cell comprises at least two solar cells according to any one of claims 1-11, and a cutting path is arranged between two adjacent solar cells. The third doped layer is arranged at the edge of the solar cell master structure.

13. The solar cell master structure of claim 12, wherein, The third doped layers of two adjacent solar cells are asymmetrically arranged with respect to the cutting path between the two solar cells.

14. The solar cell master structure of claim 12, wherein, The third doped layers of two adjacent solar cells are symmetrically arranged with respect to the cutting path between the two solar cells.

15. A battery assembly characterized by, The solar cell comprises the solar cell according to any one of claims 1-11 and the solar cell master structure according to any one of claims 12-14.

16. A photovoltaic system characterized by, The battery assembly comprises the solar cell according to claim 15.

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