Photovoltaic cell and photovoltaic module

Abstract

The utility model discloses a photovoltaic cell piece and photovoltaic module, photovoltaic cell piece includes cell piece body, and at least one grid line area is equipped with a plurality of first grid line, and the first anode grid line and the first negative pole grid line in a plurality of first grid line are along second direction alternately arranged, and the first anode grid line is established on the first conductive type doped layer, and the first negative pole grid line is established on the second conductive type doped layer. The quantity of the first grid line in the two grid line areas of the two side edges nearest to cell piece body along third direction is even. According to the photovoltaic cell piece of the utility model, it is beneficial to complete the continuous welding of interconnection structural member and a plurality of photovoltaic cell pieces, improves the production efficiency of photovoltaic cell piece, reduces the welding deviation at the same time, improves the yield of photovoltaic cell piece, and the direct conduction path of the first grid line of photovoltaic cell piece to interconnection structural member in third direction can be formed, and the span conduction or roundabout conduction of current between the first grid line of adjacent two photovoltaic cell pieces is avoided.

Description

Technical Field

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

[0002] In related technologies, photovoltaic cells have multiple grid lines within their grid area. However, along the string extension direction of the photovoltaic cell, there are instances where grid lines of the same polarity face each other between cells. Even after flipping the photovoltaic cells, positive terminals may still face each other, or negative terminals may face each other. Consequently, it is difficult to continuously weld multiple photovoltaic cells together using interconnect structures, reducing both the production efficiency and yield of photovoltaic cells. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a photovoltaic cell that facilitates the continuous welding of interconnecting structural components and multiple photovoltaic cells, thereby improving the production efficiency of photovoltaic cells, reducing welding deviations, and increasing the yield of photovoltaic cells.

[0004] Another objective of this invention is to provide a photovoltaic module.

[0005] A photovoltaic cell according to a first aspect of the present invention includes: a cell body, the cell body comprising a cell substrate, a first conductivity type doped layer, and a second conductivity type doped layer, wherein the two side surfaces of the cell substrate in a first direction are a first surface and a second surface, the first surface being provided with the first conductivity type doped layer and the second conductivity type doped layer, the first conductivity type doped layer and the second conductivity type doped layer being alternately arranged in a second direction, the cell body further comprising a plurality of independent grid line regions, the plurality of grid line regions being arranged along a third direction, and an isolation region being provided between adjacent grid line regions, the first direction, The second direction and the third direction are orthogonal to each other; at least one of the grid lines regions is provided with a plurality of first grid lines, which extend along the third direction and are arranged at intervals along the second direction. The plurality of first grid lines include a plurality of first positive grid lines and a plurality of first negative grid lines. The first positive grid lines and the first negative grid lines are arranged alternately along the second direction. The first positive grid lines are disposed on the first conductivity type doped layer, and the first negative grid lines are disposed on the second conductivity type doped layer. The number of first grid lines in the two grid lines regions closest to the two sides of the cell body along the third direction is an even number.

[0006] According to the photovoltaic cell of this utility model embodiment, by controlling that the number of first grid lines in the two grid line regions closest to the two sides of the cell body along the third direction is always even, it is beneficial to control that the polarities of the two adjacent first grid lines in the third direction of two adjacent photovoltaic cells are opposite. During the series connection of photovoltaic cells, the staggered connection of the first grid lines with opposite polarities with the interconnecting structure (e.g., solder ribbon) facilitates the continuous welding of the interconnecting structure to multiple photovoltaic cells, improving the production efficiency of photovoltaic cells while reducing welding deviations and increasing the yield of photovoltaic cells. Simultaneously, it forms a direct conduction path from the first grid line of the photovoltaic cell in the third direction to the interconnecting structure, avoiding current conduction across the first grid lines between two adjacent photovoltaic cells or bypassing them.

[0007] According to some embodiments of the present invention, the number of the first gate lines in all the gate line regions is an even number, and the number of the first gate lines in all the gate line regions is equal.

[0008] According to some embodiments of the present invention, the photovoltaic cell further includes: a plurality of second grid lines, the plurality of second grid lines extending along the second direction and spaced apart along the third direction, the plurality of second grid lines including a plurality of second positive grid lines and a plurality of second negative grid lines, the second positive grid lines and the second negative grid lines being alternately arranged along the third direction.

[0009] According to some embodiments of the present invention, the photovoltaic cell further includes: a plurality of third grid lines, wherein the plurality of third grid lines are provided in at least one grid line region, the plurality of third grid lines extend along the third direction and are spaced apart along the second direction, the plurality of third grid lines include a plurality of third positive grid lines and a plurality of third negative grid lines, the third positive grid lines and the third negative grid lines are alternately arranged along the second direction.

[0010] According to some embodiments of the present invention, the number of first gate lines in each gate line region is N, and the number of third gate lines in each gate line region is N-2.

[0011] According to some embodiments of the present invention, the plurality of third gate lines include a plurality of third positive gate lines and a plurality of third negative gate lines. The plurality of third positive gate lines are electrically connected to at least a portion of the plurality of first positive gate lines. The plurality of third positive gate lines are insulated from all the first negative gate lines. The plurality of third negative gate lines are electrically connected to at least a portion of the plurality of first negative gate lines. The plurality of third negative gate lines are insulated from all the first positive gate lines.

[0012] According to some embodiments of the present invention, the second grid line includes a second sub-connecting segment, the second sub-connecting segment overlaps with the third grid line, the width of the second grid line at the overlap with the third grid line in the third direction is W1, and the width of the remaining positions of the second grid line in the third direction is W2, wherein W1 and W2 satisfy: W1 > W2; and / or, the width of the third grid line at the overlap with the second grid line in the second direction is W3, and the width of the remaining positions of the third grid line in the second direction is W4, wherein W3 and W4 satisfy: W3 > W4.

[0013] A photovoltaic module according to a second aspect of the present invention includes: a photovoltaic cell, wherein the photovoltaic cell is the same as the photovoltaic cell described in the first aspect of the present invention; and an interconnecting structure, wherein two adjacent grid areas of the photovoltaic cell are electrically connected through the interconnecting structure, and two adjacent photovoltaic cells are connected in series through the interconnecting structure.

[0014] According to some embodiments of the present invention, the two sides of the photovoltaic cell along a third direction are respectively the first side and the second side, the number of grid lines on the photovoltaic cell is even, the first side of the photovoltaic cell and the second side of the adjacent photovoltaic cell are adjacent to each other, and the two adjacent grid lines of two adjacent photovoltaic cells are connected in series through the interconnection structure.

[0015] According to some embodiments of the present invention, the two sides of the photovoltaic cell along a third direction are respectively the first side and the second side, the number of grid lines on the photovoltaic cell is odd, the first side or the second side of the photovoltaic cell and the first side or the second side of the adjacent photovoltaic cell are adjacent to each other, and the two adjacent grid lines of two adjacent photovoltaic cells are connected in series through the interconnection structure.

[0016] Additional aspects and advantages of this 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. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a photovoltaic cell according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of a photovoltaic cell according to another embodiment of the present invention; Figure 3 This is a cross-sectional view of a photovoltaic cell according to an embodiment of the present invention.

[0018] Figure label: 100: Photovoltaic cells; 1: Cell body; 11: Grid line region; 112: First grid line; 1121: First positive grid line; 1122: First negative grid line; 113: Second grid line; 1131: Second positive grid line; 1132: Second negative grid line; 114: Third grid line; 1141: Third positive grid line; 1142: Third negative grid line; 14: Cell substrate; 15: First conductivity type doped layer; 16: Second conductivity type doped layer; 17: First side; 18: Second side. Detailed Implementation

[0019] The following is for reference. Figures 1-3 A photovoltaic cell 100 according to a first aspect embodiment of the present invention is described.

[0020] like Figures 1-3 As shown, the photovoltaic cell 100 according to the first aspect of the present invention includes a cell body 1.

[0021] Specifically, the battery cell body 1 includes a battery substrate 14, a first conductivity type doped layer 15, and a second conductivity type doped layer 16. The two sides of the battery substrate 14 in a first direction are a first surface and a second surface. The first surface is provided with the first conductivity type doped layer 15 and the second conductivity type doped layer 16. The first conductivity type doped layer 15 and the second conductivity type doped layer 16 are alternately arranged in a second direction. The battery cell body 1 also includes multiple independent grid line regions 11, which are arranged along a third direction. An isolation region exists between adjacent grid line regions 11. The first direction, the second direction, and the third direction are orthogonal to each other. In the description of this utility model, "multiple" means two or more.

[0022] At least one gate region 11 is provided with a plurality of first gate lines 112. The plurality of first gate lines 112 extend along a third direction and are arranged at intervals along a second direction. The plurality of first gate lines 112 include a plurality of first positive gate lines 1121 and a plurality of first negative gate lines 1122. The first positive gate lines 1121 and the first negative gate lines 1122 are arranged alternately along the second direction. The first positive gate lines 1121 are disposed on a first conductivity type doped layer 15, and the first negative gate lines 1122 are disposed on a second conductivity type doped layer 16.

[0023] The number of first grid lines 112 in the two grid line regions 11 closest to the two sides of the battery cell body 1 along the third direction is even.

[0024] The first conductivity type doped layer 15 and the second conductivity type doped layer 16 are both disposed on the first surface of the battery substrate 14. The battery substrate 14 is the core functional layer of the battery, which plays the main role in light absorption and carrier generation. The first conductivity type doped layer 15 and the second conductivity type doped layer 16 introduce impurity atoms to regulate the conductivity characteristics of the battery substrate 14 and other functional layers, thereby enabling the separation of photogenerated carriers.

[0025] The first gate line 112 extends in the same direction as the first conductivity type doped layer 15 and the second conductivity type doped layer 16. The first positive gate line 1121 and the first negative gate line 1122 are adjacent to the corresponding first conductivity type doped layer 15 or second conductivity type doped layer 16. The charge carriers do not need to migrate a long distance to the first surface, reducing transmission loss and recombination probability, and improving the fill factor.

[0026] It should be noted that the first positive gate line 1121 and the first negative gate line 1122 are respectively disposed on the first conductivity type doped layer 15 and the second conductivity type doped layer 16. This does not mean that they are in direct contact, but only that they are on the top in space. Other films, such as passivation layers or anti-reflection layers, may be disposed between the first conductivity type doped layer 15 and the first positive gate line 1121. Other films, such as passivation layers or anti-reflection layers, may be disposed between the second conductivity type doped layer 16 and the first negative gate line 1122.

[0027] The solar cell body 1 serves as the foundation for absorbing light energy and achieving photoelectric conversion. The solar cell body 1 may include two, three, or four grid line regions 11, without specific limitations. The design of multiple grid line regions 11 on the solar cell body 1 avoids the cutting step, improves the photoelectric conversion efficiency of the photovoltaic module, and also improves the efficiency of forming a photovoltaic module by connecting multiple photovoltaic cells 100 in series and parallel.

[0028] For example, in Figure 1 and Figure 2In the example, the number of first grid lines 112 in the two grid regions 11 closest to the two sides of the cell body 1 along the third direction can be an even number, such as 2, 4, 6, or 8; the specific number is not specifically limited here. Since the first positive grid line 1121 and the first negative grid line 1122 in the first grid lines 112 are arranged alternately along the second direction, the number of first positive grid lines 1121 and first negative grid lines 1122 in the two grid regions 11 closest to the two sides of the cell body 1 along the third direction is the same. This facilitates control so that the polarities of the two adjacent first grid lines 112 in the third direction within two adjacent photovoltaic cells 100 are opposite. During the series connection of photovoltaic cells 100, the interconnecting structure is staggered with the first grid line 112 along the extension direction of the first grid line 112 and the first grid line 112 with opposite polarity, thereby completing the continuous welding of the interconnecting structure with multiple photovoltaic cells 100. This improves the production efficiency of photovoltaic cells 100, reduces welding deviation, and improves the yield of photovoltaic cells 100. At the same time, it can form a direct conduction path from the first grid line 112 in the third direction of the photovoltaic cell 100 to the interconnecting structure, avoiding the current from being conducted across the first grid line 112 between two adjacent photovoltaic cells 100 or bypassing the conduction path.

[0029] According to the photovoltaic cell 100 of this utility model embodiment, by controlling that the number of first grid lines 112 in the two grid line regions 11 closest to the two sides of the cell body 1 along the third direction is always even, it is beneficial to control that the polarities of the two adjacent first grid lines 112 in the third direction of two adjacent photovoltaic cells 100 are opposite. During the series connection of photovoltaic cells 100, it is beneficial to connect the first grid lines 112 with opposite polarities to the interconnecting structure (e.g., solder ribbon) in an alternating manner, thereby completing the continuous welding of the interconnecting structure to multiple photovoltaic cells 100, improving the production efficiency of photovoltaic cells 100, reducing welding deviation, improving the yield of photovoltaic cells 100, and forming a direct conduction path from the first grid line 112 of the photovoltaic cell 100 in the third direction to the interconnecting structure, avoiding the current being conducted across the first grid line 112 between two adjacent photovoltaic cells 100 or bypassing the current.

[0030] According to some embodiments of this utility model, refer to Figure 1 and Figure 2The number of first grid lines 112 in all grid regions 11 is even, and the number of first grid lines 112 in all grid regions 11 is equal. This ensures that the first grid lines 112 in all grid regions 11 are symmetrically arranged along the central axis of the cell body 1 in the second direction, allowing current to flow into the first grid lines 112 in both directions. The equal number of first grid lines 112 in all grid regions 11 facilitates the interconnection structure to sequentially connect the first grid lines 112 in the same direction within all grid regions 11 along a third direction upward. This also facilitates the formation of a connection method consisting of a first positive grid line 1121, a first negative grid line 1122, and a first positive grid line 1121, or a first negative grid line 1122, a first positive grid line 1121, and a first negative grid line 1122, avoiding long-distance current conduction in a single direction.

[0031] According to some embodiments of this utility model, refer to Figure 1 and Figure 2 The photovoltaic cell 100 further includes a plurality of second grid lines 113, which extend along a second direction and are spaced apart along a third direction. Each second grid line 113 includes a plurality of second positive grid lines 1131 and a plurality of second negative grid lines 1132, which are alternately arranged along the third direction. This effectively avoids mutual interference between adjacent second grid lines 113, while the spaced arrangement helps to minimize the number of second grid lines 113 while still achieving their function. Multiple second positive gate lines 1131 in the second gate line 113 collect charge carriers (positive charge carriers) from the first conductivity type doped layer 15, and multiple second negative gate lines 1132 collect charge carriers (negative charge carriers) collected from the second conductivity type doped layer 16. At the same time, by arranging the second positive gate lines 1131 and the second negative gate lines 1132 alternately along the third direction, the charge carrier collection efficiency is improved and the transmission path is shortened, thereby improving the charge carrier transmission efficiency of the photovoltaic cell 100 for photoelectric conversion and improving the photoelectric conversion rate.

[0032] Furthermore, referring to Figure 1 and Figure 2 The photovoltaic cell 100 further includes a plurality of third grid lines 114, with at least one grid line region 11 containing the plurality of third grid lines 114. The plurality of third grid lines 114 extend along a third direction and are spaced apart along a second direction. This effectively avoids mutual interference between adjacent third grid lines 114, while the spaced arrangement helps to minimize the number of third grid lines 114 and achieve the function of the third grid lines 114.

[0033] The plurality of third gate lines 114 include a plurality of third positive gate lines 1141 and a plurality of third negative gate lines 1142, which are arranged alternately along the second direction. This arrangement ensures that adjacent third gate lines 114 along the second direction have opposite polarities, shortening the carrier transport distance and reducing the series resistance. The alternating arrangement of the third positive gate lines 1141 and third negative gate lines 1142 along the second direction helps ensure that the third positive gate lines 1141 and third negative gate lines 1142 can transport carriers normally. Simultaneously, the spacing between the third positive gate lines 1141 and third negative gate lines 1142 avoids the risk of short circuits caused by contact between them.

[0034] Furthermore, referring to Figure 1 The number of first gate lines 112 in each gate region 11 is N, and the number of third gate lines 114 in each gate region 11 is N-2. Therefore, the number of third gate lines 114 in each gate region 11 is two fewer than the number of first gate lines 112 in the gate region 11. (Refer to...) Figure 1 Each grid area 11 has a first grid line 112 on both sides of the edge of the cell body 1 in the second direction, while the corresponding third grid line 114 is not provided there.

[0035] Since the edge of the cell body 1 cannot be covered or welded by the interconnect structure, the current on the second grid line 113 in this area cannot be discharged through the interconnect structure. Therefore, even if the third grid line 114 is set at the edge of the cell body 1, it is difficult to achieve current transmission through the interconnect structure. Therefore, the third grid line 114 can be omitted at the edge of the cell body 1.

[0036] According to some other embodiments of the present invention, refer to Figure 1 and Figure 2The plurality of third gate lines 114 include a plurality of third positive gate lines 1141 and a plurality of third negative gate lines 1142. The plurality of third positive gate lines 1141 are electrically connected to at least a portion of the plurality of first positive gate lines 1121. The plurality of third positive gate lines 1141 are insulated from all the first negative gate lines 1122. The plurality of third negative gate lines 1142 are electrically connected to at least a portion of the plurality of first negative gate lines 1122. The plurality of third negative gate lines 1142 are insulated from all the first positive gate lines 1121. The plurality of third positive gate lines 1141 are electrically connected to at least a portion of the first positive gate lines 1121, thereby enabling the plurality of third positive gate lines 1141 to collect the current in the first positive gate lines 1121 connected to them and transmit it to the interconnection structure connected to them, thereby realizing the extraction of positive current. Meanwhile, the third positive grid line 1141 is insulated from all the first negative grid lines 1122 to prevent the third positive grid line 1141 with different polarities from being connected to any of the first negative grid lines 1122, thereby reducing the short-circuit risk of the photovoltaic cell 100 and improving the operational safety of the photovoltaic cell 100.

[0037] Multiple third negative grid lines 1142 are electrically connected to at least a portion of the first negative grid lines 1122. Thus, the multiple third negative grid lines 1142 can collect the current from the connected first negative grid lines 1122 and transmit it to the interconnecting structure connected to them, thereby achieving negative current extraction. Simultaneously, the third negative grid lines 1142 are insulated from all the first positive grid lines 1121 to prevent the third negative grid lines 1142 with different polarities from connecting to any of the first positive grid lines 1121, thereby reducing the short-circuit risk of the photovoltaic cell 100 and improving the operational safety of the photovoltaic cell 100.

[0038] According to some other embodiments of the present invention, referring to Figure 1 and Figure 2The second grid line 113 includes a second sub-connecting segment, which overlaps with the third grid line 114. The width of the overlap point between the second grid line 113 and the third grid line 114 in the third direction is W1, and the width of the remaining positions of the second grid line 113 in the third direction is W2, wherein W1 and W2 satisfy: W1 > W2. The overlap between the second sub-connecting segment of the second grid line 113 and the third grid line 114 forms a complete current transmission path, allowing the current collected by the second grid line 113 to be smoothly conducted to the third grid line 114, and then led out by the third grid line 114 to the external circuit, thereby ensuring that the electrical energy generated by the photovoltaic cell 100 can be effectively utilized. At the same time, the overlapping method increases the contact area, reduces the contact resistance, and reduces the current loss of the photovoltaic cell 100, which helps to improve the photoelectric conversion efficiency of the cell. The overlap between the second grid line 113 and the third grid line 114 is relatively wide, which helps to increase the contact area at the overlap position, thereby further reducing the contact resistance between the second grid line 113 and the third grid line 114, further reducing the current loss of the photovoltaic cell 100, and improving the photoelectric conversion efficiency of the photovoltaic cell 100.

[0039] The width of the overlap between the third grid line 114 and the second grid line 113 in the second direction is W3, and the width of the remaining positions of the third grid line 114 in the second direction is W4, wherein W3 and W4 satisfy: W3 > W4. The relatively large width of the overlap between the third grid line 114 and the second grid line 113 helps to further increase the contact area at the overlap position, thereby further reducing the contact resistance between the third grid line 114 and the second grid line 113, further reducing the current loss of the photovoltaic cell 100, and improving the photoelectric conversion efficiency of the photovoltaic cell 100.

[0040] A photovoltaic module (not shown) according to a second aspect embodiment of the present invention includes: a photovoltaic cell 100, wherein the photovoltaic cell 100 is the same as the photovoltaic cell 100 described in the first aspect embodiment of the present invention; and an interconnection structure, wherein two adjacent grid areas 11 of the photovoltaic cell 100 are electrically connected through the interconnection structure, and two adjacent photovoltaic cells 100 are connected in series through the interconnection structure.

[0041] According to the photovoltaic module of this utility model embodiment, two adjacent grid areas 11 on the photovoltaic cell 100 and two adjacent photovoltaic cells 100 can be connected by interconnecting structural components, which is beneficial to achieve orderly current conduction.

[0042] According to some embodiments of the present invention, the photovoltaic cell 100 has a first side 17 and a second side 18 along a third direction, respectively. The number of grid line regions 11 on the photovoltaic cell 100 is even. The first side 17 of the photovoltaic cell 100 and the second side 18 of the adjacent photovoltaic cell 100 are adjacent to each other, and the two adjacent grid line regions 11 of two adjacent photovoltaic cells 100 are connected in series through interconnecting structures. When the number of grid line regions 11 on the photovoltaic cell 100 is even, for example, as... Figure 1 and Figure 2 As shown, the photovoltaic cell 100 includes two grid line regions 11. Two adjacent grid line regions 11 between the first side 17 and the second side 18 of the photovoltaic cell 100 are connected in series through an interconnection structure. The current collected in the two adjacent grid line regions 11 can be conducted to the interconnection structure for discharge, thereby realizing the orderly conduction of current on the photovoltaic module.

[0043] According to some embodiments of the present invention, the photovoltaic cell 100 has a first side 17 and a second side 18 on its two sides along a third direction, respectively. The number of grid lines 11 on the photovoltaic cell 100 is odd. The first side 17 or the second side 18 of the photovoltaic cell 100 and the first side 17 or the second side 18 of adjacent photovoltaic cells 100 are adjacent to each other, and two adjacent grid lines 11 of two adjacent photovoltaic cells 100 are connected in series through an interconnecting structure. Exemplarily, the photovoltaic cell 100 includes one grid line 11, three grid line 11, or five grid line 11; no specific limitation is made here. The interconnecting structure connects two adjacent grid line 11 among the odd number of grid line 11 on the photovoltaic cell 100. This facilitates the orderly conduction of current within the multiple grid line 11 to the connected interconnecting structure, thereby achieving current extraction.

[0044] Other components and operations of the photovoltaic cell 100 and photovoltaic module according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0045] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0048] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic cell, characterized in that, include: The battery cell body includes a battery substrate, a first conductivity type doped layer, and a second conductivity type doped layer. The two sides of the battery substrate in a first direction are a first surface and a second surface. The first surface is provided with the first conductivity type doped layer and the second conductivity type doped layer. The first conductivity type doped layer and the second conductivity type doped layer are alternately arranged in a second direction. The battery cell body also includes multiple independent grid line regions. The multiple grid line regions are arranged along a third direction. There is an isolation region between two adjacent grid line regions. The first direction, the second direction, and the third direction are orthogonal to each other. At least one of the gate line regions is provided with a plurality of first gate lines, the plurality of first gate lines extend along the third direction and are spaced apart along the second direction, the plurality of first gate lines include a plurality of first positive gate lines and a plurality of first negative gate lines, the first positive gate lines and the first negative gate lines are alternately arranged along the second direction, the first positive gate lines are disposed on the first conductivity type doped layer, and the first negative gate lines are disposed on the second conductivity type doped layer; The number of the first grid lines in the two grid line regions closest to the two sides of the battery cell body along the third direction is an even number.

2. The photovoltaic cell according to claim 1, characterized in that, The number of first gate lines in all of the gate line regions is even, and the number of first gate lines in all of the gate line regions is equal.

3. The photovoltaic cell according to any one of claims 1 or 2, characterized in that, Also includes: A plurality of second gate lines extend along the second direction and are spaced apart along the third direction. The plurality of second gate lines include a plurality of second positive gate lines and a plurality of second negative gate lines, which are alternately arranged along the third direction.

4. The photovoltaic cell according to claim 3, characterized in that, Further includes: A plurality of third gate lines are provided in the at least one gate line region. The plurality of third gate lines extend along the third direction and are spaced apart along the second direction. The plurality of third gate lines include a plurality of third positive gate lines and a plurality of third negative gate lines. The third positive gate lines and the third negative gate lines are alternately arranged along the second direction.

5. The photovoltaic cell according to claim 4, characterized in that, The number of first gate lines in each gate region is N, and the number of third gate lines in each gate region is N-2.

6. The photovoltaic cell according to claim 4, characterized in that, The plurality of third gate lines include a plurality of third positive gate lines and a plurality of third negative gate lines. The plurality of third positive gate lines are electrically connected to at least a portion of the plurality of first positive gate lines. The plurality of third positive gate lines are insulated from all the first negative gate lines. The plurality of third negative gate lines are electrically connected to at least a portion of the plurality of first negative gate lines. The plurality of third negative gate lines are insulated from all the first positive gate lines.

7. The photovoltaic cell according to claim 4, characterized in that, The second gate line includes a second sub-connecting segment, which overlaps with the third gate line. The width of the overlap point between the second gate line and the third gate line in the third direction is W1, and the width of the remaining positions of the second gate line in the third direction is W2, wherein W1 and W2 satisfy: W1 > W2; and / or, The width of the third grid line at the point where it overlaps with the second grid line in the second direction is W3, and the width of the remaining positions of the third grid line in the second direction is W4, wherein W3 and W4 satisfy: W3 > W4.

8. A photovoltaic module, characterized in that, include: The photovoltaic cell is a photovoltaic cell according to any one of claims 1-7; An interconnecting structure is provided, in which two adjacent grid areas of the photovoltaic cell are electrically connected, and two adjacent photovoltaic cells are connected in series through the interconnecting structure.

9. The photovoltaic module according to claim 8, characterized in that, The photovoltaic cell has a first side and a second side on both sides along a third direction, respectively. The number of grid lines on the photovoltaic cell is even. The first side of the photovoltaic cell and the second side of the adjacent photovoltaic cell are adjacent to each other, and the two adjacent grid lines of two adjacent photovoltaic cells are connected in series through the interconnection structure.

10. The photovoltaic module according to claim 8, characterized in that, The photovoltaic cell has a first side and a second side on both sides along a third direction, respectively. The number of grid lines on the photovoltaic cell is odd. The first side or the second side of the photovoltaic cell and the first side or the second side of the adjacent photovoltaic cell are adjacent to each other, and the two adjacent grid lines of two adjacent photovoltaic cells are connected in series through the interconnection structure.

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