Battery piece, battery string, photovoltaic module and photovoltaic power generation system

Abstract

The utility model discloses a battery piece, a battery string, a photovoltaic assembly and a photovoltaic power generation system, the battery piece comprises a battery piece body and a plurality of grid lines, the plurality of grid lines comprise a plurality of first grid lines and a plurality of second grid lines, the plurality of first grid lines and the plurality of second grid lines are arranged on the same side surface of the battery piece body, and the plurality of first grid lines and the plurality of second grid lines are arranged on the same side surface of the battery piece body. The plurality of first grid lines and the plurality of second grid lines extend along a first direction, the plurality of first grid lines and the plurality of second grid lines are alternately arranged at intervals along a second direction, the polarity of the second grid lines is opposite to that of the first grid lines, the second direction is perpendicular to the first direction, and the first direction is perpendicular to the second direction. The first direction is the arrangement direction of the plurality of battery pieces of the battery string. According to the battery piece provided by the utility model, the loss of current transmission is reduced, and the photoelectric conversion efficiency of the battery piece is improved.

Description

Technical Field

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

[0002] In related technologies, photovoltaic cells are equipped with multiple main grid lines and multiple sub-grid lines. The sub-grid lines are mainly used to collect current. The current collected by the sub-grids is then fed to the main grid and led out through solder ribbons to achieve electrical connection between cells, thereby facilitating the use of the cells. However, traditional cells suffer from high current loss during transmission through the sub-grid lines, which leads to a reduction in the efficiency of the cells and photovoltaic modules. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a solar cell that reduces current transmission loss and improves the photoelectric conversion efficiency of the solar cell.

[0004] The second objective of this invention is to provide a battery string using the aforementioned battery cells.

[0005] The third objective of this invention is to provide a photovoltaic module employing the aforementioned solar cells or solar strings.

[0006] The fourth objective of this invention is to provide a photovoltaic power generation system that uses the aforementioned solar cells, solar strings, or photovoltaic modules.

[0007] A battery cell according to a first aspect of the present invention includes: a battery cell body; a plurality of grid lines, the plurality of grid lines including a plurality of first grid lines and a plurality of second grid lines, the plurality of first grid lines and the plurality of second grid lines being disposed on the same side surface of the battery cell body, the plurality of first grid lines and the plurality of second grid lines extending along a first direction, the plurality of first grid lines and the plurality of second grid lines being alternately spaced along a second direction, the second grid lines having opposite polarities to the first grid lines, the second direction being perpendicular to the first direction, and the first direction being the arrangement direction of the plurality of battery cells in a battery string.

[0008] According to the first aspect of the present invention, the battery cell, by providing a first grid line and a second grid line extending along the extension direction of the battery string, allows current collection to be conducted to conductive materials such as solder ribbons or conductive wires simply by passing through the lines, avoiding current loss during transmission in the sub-grid, improving the photoelectric conversion efficiency of the battery cell and battery string, and enhancing the performance of the battery cell.

[0009] According to some embodiments of the present invention, a plurality of first gate lines and a plurality of second gate lines are arranged at uniform intervals along the second direction.

[0010] According to some embodiments of the present invention, the spacing between adjacent first and second gate lines is d1, wherein d1 satisfies: 0.6mm≤d1≤2.1mm.

[0011] According to some embodiments of the present invention, adjacent first gate lines and second gate lines form a group, and the spacing between two adjacent groups of gate lines is greater than the spacing between the first gate lines and the second gate lines in the same group.

[0012] According to some embodiments of the present invention, the spacing between two adjacent groups of gate lines is d2, and the spacing between the first gate line and the second gate line in the same group is d3, wherein d2 and d3 satisfy: 1≤d2 / d3≤3.

[0013] According to some embodiments of the present invention, one end of the plurality of first gate lines and the plurality of second gate lines is flush with the first direction; and / or, the other end of the plurality of first gate lines and the plurality of second gate lines is flush with the first direction.

[0014] According to some embodiments of the present invention, the distance between one end of the first grid line and the second grid line along the first direction and the corresponding side edge of the battery cell body is L1, wherein L1 satisfies: 0≤L1≤2mm.

[0015] According to some embodiments of the present invention, a plurality of first gate lines and a plurality of second gate lines are parallel to each other.

[0016] A battery string according to a second aspect of the present invention includes: a plurality of battery cells, wherein the battery cells are the same as those described in the first aspect of the present invention, the plurality of battery cells are arranged along a first direction, and adjacent battery cells are electrically connected.

[0017] A photovoltaic module according to a third aspect of the present invention includes a cell according to the first aspect of the present invention, or a string of cells according to the second aspect of the present invention.

[0018] A photovoltaic power generation system according to a fourth aspect of the present invention includes a battery cell according to the first aspect of the present invention, or a battery string according to the second aspect of the present invention, or a photovoltaic module according to the third aspect of the present invention.

[0019] 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

[0020] 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:

[0021] Figure 1 This is a schematic diagram of a battery cell according to an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of a battery cell according to another embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a battery string according to an embodiment of the present invention.

[0024] Figure label:

[0025] 100, battery cell; 200, battery string;

[0026] 1. Battery cell body;

[0027] 2. Grid line; 21. First grid line; 22. Second grid line;

[0028] 221. First end; 222. Second end;

[0029] 3. Welding strip. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-3 The following describes a battery cell 100 according to a first aspect embodiment of the present invention. In the following description of this application, the battery cell 100 is described as an example of a back-contact battery, but is not limited thereto.

[0031] like Figures 1-3 As shown, the battery cell 100 according to the first aspect of the present invention includes a battery cell body 1 and a plurality of grid lines 2.

[0032] Specifically, the plurality of grid lines 2 include a plurality of first grid lines 21 and a plurality of second grid lines 22. The plurality of first grid lines 21 and the plurality of second grid lines 22 are all disposed on the same side surface of the battery cell body 1. The plurality of first grid lines 21 and the plurality of second grid lines 22 extend along a first direction. The plurality of first grid lines 21 and the plurality of second grid lines 22 are arranged alternately along a second direction. The polarity of the second grid lines 22 is opposite to that of the first grid lines 21. The second direction is perpendicular to the first direction. The first direction is the extension direction of the battery string 200 (that is, the arrangement direction of the plurality of battery cells 100 of the battery string 200).

[0033] For example, in Figure 1 and Figure 2In the example, multiple first grid lines 21 and multiple second grid lines 22 are all disposed on the back side of the battery cell body 1. Both the first grid lines 21 and the second grid lines 22 extend vertically, meaning their extension directions are the same as the arrangement direction of the multiple battery cells 100 when connected to form a battery string 200. The multiple first grid lines 21 and multiple second grid lines 22 are arranged alternately in the left-right direction. For example, when the first grid line 21 is the positive grid line 2, the second grid line 22 is the negative grid line 2. Similarly, when the first grid line 21 is the negative grid line 2, the second grid line 22 is the positive grid line 2. The extension direction of the battery string 200 is also the arrangement direction of the multiple battery strings 200. For example, Figure 1 The up and down directions in the middle.

[0034] In this application, the extension directions of the first grid line 21 and the second grid line 22 are the same as those of the conventional main grid line 2. This can also be understood as the solar cell 100 in this application being a gridless solar cell, with the cell body 1 only having the main grid line 2 extending in the same direction as the solder ribbon 3. With this configuration, compared to conventional technology, the solar cell 100 only retains the first grid line 21 and the second grid line 22, which are made of conductive materials. Current collection can be conducted to conductive materials such as the solder ribbon 3 or conductive wires simply by passing through these grid lines 2, avoiding current loss during transmission through the sub-grid. That is, the first grid line 21 and the second grid line 22 in this application serve both as current collectors and current collectors. When multiple solar cells 100 are connected to form a battery string 200, the electrical connection of the solar cells 100 can be achieved through the electrical connection of the corresponding grid lines 2 of the multiple solar cells 100, improving the photoelectric conversion efficiency of the solar cells 100 and the battery string 200, and enhancing the performance of the solar cell 100. In addition, when multiple battery cells 100 are connected together, there is no need to use insulating glue and solder paste, which avoids the reliability risks of new materials and simplifies the production process of battery string 200.

[0035] According to the first aspect embodiment of the present invention, the battery cell 100, by providing a first grid line 21 and a second grid line 22 extending along the extension direction of the battery string 200, can conduct current collection to conductive materials such as solder ribbon 3 or conductive wire simply by passing through the line, avoiding current loss in the sub-grid transmission, improving the photoelectric conversion efficiency of the battery cell 100 and the battery string 200, and improving the performance of the battery cell 100.

[0036] According to some embodiments of this utility model, combined with Figure 1 and Figure 3One end of the first gate line 21 and the second gate line 22 along the first direction is a first end 221, and the other end of the first gate line 21 and the second gate line 22 along the first direction is a second end 222. The first end 221 of the first gate line 21 extends beyond the first end 221 of the second gate line 22, and the second end 222 of the second gate line 22 extends beyond the second end 222 of the first gate line 21.

[0037] For example, in Figure 1 and Figure 3 In the example, the upper ends of the first grid line 21 and the second grid line 22 are designated as first ends 221, and the lower ends of the first grid line 21 and the second grid line 22 are designated as second ends 222. The distance between the first end 221 of the first grid line 21 and the upper edge of the battery cell 100 is less than the distance between the first end 221 of the second grid line 22 and the upper edge of the battery cell 100, and the distance between the second end 222 of the first grid line 21 and the lower edge of the battery cell 100 is greater than the distance between the second end 222 of the second grid line 22 and the lower edge of the battery cell 100. For example, the grid line 2 material of this application can use materials that are easy to sinter and conduct electricity, such as silver, to achieve the effect of reducing silver content.

[0038] This configuration, on the one hand, ensures the current collection capability of the first grid line 21 and the second grid line 22 while distinguishing them. This facilitates easy differentiation of the first grid line 21 and the second grid line 22 when multiple battery cells 100 are connected, improving the connection accuracy and efficiency of the battery cells 100, and thus increasing the manufacturing efficiency of the battery string 200. On the other hand, when two adjacent battery cells 100 are connected, the first grid line 21 of each battery cell 100 is connected to the second grid line 22 of the adjacent battery cell 100, such as... Figure 1 and Figure 2 As shown, the distance between the upper end of the first grid line 21 and the lower end of the second grid line 22 of another battery cell 100 located above the battery cell 100 is relatively short, and the distance between the lower end of the second grid line 22 and the upper end of the first grid line 21 of another battery cell 100 located below the battery cell 100 is relatively short. This shortens the distance between the ends of the first grid line 21 and the ends of the second grid line 22 of two adjacent battery cells 100, which is more conducive to the electrical connection of two adjacent battery cells 100, reduces the assembly difficulty of the battery string 200, and improves production efficiency.

[0039] According to some embodiments of this utility model, combined with Figure 1 and Figure 3 The first end 221 of the first grid line 21 is adjacent to one side edge of the cell body 1 along the first direction, and the second end 222 of the second grid line 22 is adjacent to the other side edge of the cell body 1 along the first direction.

[0040] For example, in Figure 1 and Figure 3 In the example, the upper end of the first grid line 21 is adjacent to the upper edge of the cell body 1, and the lower end of the second grid line 22 is adjacent to the lower edge of the cell body 1. This arrangement, on the one hand, increases the length of the first grid line 21 and the second grid line 22, thereby increasing the area occupied by the multiple first grid lines 21 and the multiple second grid lines 22 on the cell body 1, and improving the photoelectric conversion capability of the cell 100. On the other hand, it facilitates the connection between the first grid line 21 and the second grid line 22 of the adjacent cell 100, and also facilitates the connection between the second grid line 22 and the first grid line 21 of the adjacent cell 100, further facilitating the connection of multiple cells 100.

[0041] According to some embodiments of this utility model, the width of the first end 221 of the first grid line 21 is greater than the width of the remaining portion of the first grid line 21 excluding the first end 221. The width of the second end 222 of the second grid line 22 is greater than the width of the remaining portion of the second grid line 22 excluding the second end 222. That is, the end of the first grid line 21 connected to the second grid line 22 of the adjacent battery cell 100 is thicker, and the end of the second grid line 22 connected to the first grid line 21 of the adjacent battery cell 100 is thicker. With this configuration, when multiple battery cells 100 are connected, the contact area between the first grid line 21 and the second grid line 22 and the corresponding electrical connector, such as the solder ribbon 3, is increased, thereby making the connection between the first grid line 21, the second grid line 22 and the solder ribbon 3 more robust, improving the connection stability of multiple battery cells 100, and facilitating the long-term stable use of the battery cells 100 and the battery string 200. At the same time, it also increases the area occupied by the first grid line 21 and the second grid line 22 on the surface of the battery cell body 1, further improving the electrical performance of the battery cell 100. In addition, it also reduces the connection accuracy between the solder strip 3 and the first grid line 21 and the second grid line 22, reduces the processing difficulty of the battery string 200, and improves processing efficiency.

[0042] According to some embodiments of this utility model, the first end 221 of the first grid line 21 and the second end 222 of the second grid line 22 are respectively provided with Pad points. This arrangement increases the contact area between the first grid line 21 and the second grid line 22 and the corresponding electrical connectors, such as the solder ribbon 3, when multiple battery cells 100 are connected. This makes the connection between the first grid line 21, the second grid line 22 and the solder ribbon 3 more robust, improving the connection stability of the multiple battery cells 100 and facilitating the long-term stable use of the battery cells 100 and the battery string 200. Furthermore, it reduces the connection precision between the solder ribbon 3 and the first grid line 21 and the second grid line 22, reducing the processing difficulty of the battery string 200 and improving processing efficiency. It should be noted that the shape of the Pad points can be set according to specific applications, for example, it can be set to a circle or a square.

[0043] According to some embodiments of this utility model, refer to Figure 1Multiple first grid lines 21 and multiple second grid lines 22 are evenly spaced along a second direction. For example, in Figure 1 In the example, multiple first grid lines 21 and multiple second grid lines 22 are arranged at equal intervals. This facilitates the printing of the first grid lines 21 and second grid lines 22, reduces the printing difficulty of the first grid lines 21 and second grid lines 22, and improves the production efficiency of the solar cell 100. In addition, the solar cell 100 has a more aesthetically pleasing appearance.

[0044] According to some embodiments of the present invention, the spacing between adjacent first gate line 21 and second gate line 22 is d1, wherein d1 satisfies: 0.6mm≤d1≤2.1mm.

[0045] For example, when the spacing between adjacent first grid lines 21 and second grid lines 22 is less than 1 mm, the distance between them is relatively short, making them prone to contact after offset, thus increasing the printing difficulty. When the spacing between adjacent first grid lines 21 and second grid lines 22 is greater than 1 mm, the distance between them is larger, reducing the total number of first grid lines 21 and second grid lines 22 on the cell body 1 and lowering the photoelectric conversion efficiency of the cell 100. Therefore, by setting the spacing d1 between adjacent first grid lines 21 and second grid lines 22 to satisfy 0.6 mm ≤ d1 ≤ 2.1 mm, the distance between them is moderate, improving both the photoelectric conversion efficiency and production efficiency of the cell 100. For example, the spacing between the first grid lines 21 and second grid lines 22 on a 182 mm × 182 mm cell is set to 0.6 mm to 1.8 mm. For a 210mm×210mm battery cell, the spacing between the first grid line 21 and the second grid line 22 is set to 0.7mm to 2.1mm.

[0046] According to some embodiments of this utility model, combined with Figure 2 Adjacent first grid lines 21 and second grid lines 22 form a group, and the spacing between two adjacent groups of grid lines 2 is greater than the spacing between the first grid lines 21 and second grid lines 22 within the same group. This arrangement facilitates the differentiation of different groups of grid lines 2. When multiple battery cells 100 are connected to form a battery string 200, it improves the accuracy of connecting the first grid lines 21 and second grid lines 22 of adjacent battery cells 100, reduces the probability of incorrect connections, and thus improves the manufacturing accuracy and production efficiency of the battery string 200. Furthermore, the design of unequally spaced parallel grid lines 2 can optimize the shortcomings of the battery cell 100 manufacturing process.

[0047] According to some embodiments of this utility model, the spacing between two adjacent groups of grid lines 2 is d2, and the spacing between the first grid line 21 and the second grid line 22 in the same group is d3, wherein d2 and d3 satisfy: 1≤d2 / d3≤3. This arrangement ensures that the distance between two adjacent groups of grid lines 2 and the spacing between the first grid line 21 and the second grid line 22 in the same group are reasonably set, that is, the arrangement of the first grid line 21 and the second grid line 22 is reasonable. This is beneficial for current collection, as well as for the printing of the grid lines 2, and ultimately for the performance of the battery cell 100.

[0048] According to some embodiments of this utility model, combined with Figure 1 The first gate lines 21 and the second gate lines 22 are aligned at one end along the first direction. And / or, the other ends of the first gate lines 21 and the second gate lines 22 are aligned along the first direction. For example, in... Figure 1 In the example, the ends of the multiple first grid lines 21 and the multiple second grid lines 22 are aligned vertically. This arrangement facilitates the overall printing of the first grid lines 21 and the second grid lines 22, thereby benefiting the production and processing of the battery cell 100. Furthermore, the overall arrangement of the multiple first grid lines 21 and the multiple second grid lines 22 is relatively neat and aesthetically pleasing.

[0049] According to some embodiments of this utility model, combined with Figure 1 The distance between one end of the first grid line 21 and the second grid line 22 along the first direction and the corresponding edge of the battery cell body 1 is L1, wherein L1 satisfies: 0≤L1≤2mm.

[0050] For example, in Figure 1In the example, the distance between the upper end of the first grid line 21 and the upper edge of the cell body 1 is the same as the distance between the lower end of the first grid line 21 and the lower edge of the cell body 1. Similarly, the distance between the upper end of the second grid line 22 and the upper edge of the cell body 1 is the same as the distance between the lower end of the second grid line 22 and the lower edge of the cell body 1. When L1 is 0, both ends of the first grid line 21 and the second grid line 22 extend to the edge of the cell body 1 along their length. When L1 is greater than 2 mm, the distance between the ends of the first grid line 21 and the second grid line 22 and the edge of the cell body 1 is large, shortening the length of the first grid line 21 and the second grid line 22 and reducing the photoelectric conversion efficiency. Therefore, by setting L1 to satisfy 0 ≤ L1 ≤ 2 mm, the distance between the ends of the first grid line 21 and the second grid line 22 and the edge of the cell body 1 is reasonably set, which is beneficial for current collection by the first grid line 21 and the second grid line 22, and also facilitates the printing and processing of the first grid line 21 and the second grid line 22. For example, the distance L1 between one end of the first grid line 21 and the second grid line 22 along the first direction and the corresponding edge of the battery cell body 1 can be 0.4mm, 0.5mm or 0.9mm, which can be set according to the usage requirements.

[0051] According to some embodiments of this utility model, combined with Figure 1 and Figure 2 Multiple first gate lines 21 and multiple second gate lines 22 are parallel to each other. For example, in Figure 1 and Figure 2 In the example, both the first grid line 21 and the second grid line 22 extend in a straight line in the vertical direction. This avoids contact between the first grid line 21 or the second grid line 22 and adjacent grid lines 22 due to printing at an angle; that is, the first grid line 21 is less likely to contact the second grid line 22, thus preventing short circuits in the solar cell 100. Furthermore, the reasonable arrangement of the first grid line 21 and the second grid line 22 improves the surface utilization of the solar cell 100 and also facilitates the printing of the first grid line 21 and the second grid line 22.

[0052] According to the battery string 200 of the second aspect embodiment of the present utility model, combined with Figure 3 It includes multiple battery cells 100, which are battery cells 100 according to the first aspect embodiment described above. The multiple battery cells 100 are arranged along a first direction, and adjacent battery cells 100 are electrically connected. For example, adjacent battery cells 100 can be electrically connected by solder strips 3 to facilitate current transmission.

[0053] According to the embodiment of the present invention, the battery string 200, by employing the aforementioned battery cell 100, reduces current loss on the battery cell 100, improves the power generation efficiency of the battery string 200, enhances the performance of the battery string 200, and increases the power output of the battery string 200. Furthermore, it also improves the production efficiency of the battery string 200.

[0054] A photovoltaic module (not shown) according to a third aspect embodiment of the present invention includes a cell 100 according to the first aspect embodiment or a cell string 200 according to the second aspect embodiment.

[0055] The photovoltaic module according to the present invention improves the production efficiency and performance by using the above-mentioned solar cell 100 or solar cell string 200.

[0056] A photovoltaic power generation system according to a fourth aspect of the present invention includes a solar cell 100 according to the first aspect of the present invention, or a solar cell string 200 according to the second aspect of the present invention, or a photovoltaic module according to the third aspect of the present invention.

[0057] The photovoltaic power generation system according to the present invention improves the production efficiency and performance of the photovoltaic power generation system by adopting the above-mentioned solar cells 100, solar strings 200 or photovoltaic modules.

[0058] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0059] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0060] 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.

[0061] 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 battery cell, characterized in that, include: The battery cell itself; Multiple grid lines, including multiple first grid lines and multiple second grid lines, are disposed on the same side surface of the battery cell body. The multiple first grid lines and multiple second grid lines extend along a first direction. The multiple first grid lines and multiple second grid lines are arranged alternately and at intervals along a second direction. The polarity of the second grid lines is opposite to that of the first grid lines. The second direction is perpendicular to the first direction. The first direction is the arrangement direction of the multiple battery cells in the battery string. The first and second gate lines that are adjacent to each other form a group, and the spacing between two adjacent groups of gate lines is greater than the spacing between the first and second gate lines in the same group.

2. The battery cell according to claim 1, characterized in that, The plurality of first gate lines and the plurality of second gate lines are arranged at uniform intervals along the second direction.

3. The battery cell according to claim 2, characterized in that, The spacing between adjacent first and second gate lines is d1, wherein d1 satisfies: 0.6mm≤d1≤2.1mm.

4. The battery cell according to claim 1, characterized in that, The spacing between two adjacent sets of gate lines is d2, and the spacing between the first gate line and the second gate line in the same set is d3, wherein d2 and d3 satisfy: 1≤d2 / d3≤3.

5. The battery cell according to claim 1, characterized in that, The first gate lines and the second gate lines are aligned at one end along the first direction; and / or The other ends of the plurality of first gate lines and the plurality of second gate lines are aligned along the first direction.

6. The battery cell according to claim 5, characterized in that, The distance between one end of the first grid line and the second grid line along the first direction and the corresponding edge of the battery cell body is L1, wherein L1 satisfies: 0≤L1≤2mm.

7. The battery cell according to any one of claims 1-6, characterized in that, The plurality of first gate lines and the plurality of second gate lines are parallel to each other.

8. A battery string, characterized in that, include: A plurality of battery cells, wherein the battery cells are according to any one of claims 1-7, the plurality of battery cells are arranged along a first direction, and adjacent battery cells are electrically connected.

9. A photovoltaic module, characterized in that, It includes the battery cell according to any one of claims 1-7, or the battery string according to claim 8.

10. A photovoltaic power generation system, characterized in that, It includes the solar cell according to any one of claims 1-7, the solar cell string according to claim 8, or the photovoltaic module according to claim 9.

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