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 at least one grid line, and at least one side surface of the battery piece body is provided with at least one groove; and the grid lines are arranged in the grooves, and the grid lines are electrically connected with the battery piece body. Therefore, the battery piece body is suitable for converting light energy into electric energy, the grid lines are suitable for leading out current generated on the battery piece body, the grooves are formed in the battery piece body, the influence of the grid lines on the effective illumination area of the battery piece is reduced due to the fact that the grid lines are arranged in the grooves, and the grid lines can collect the current generated by the battery piece body more effectively. And the photoelectric conversion efficiency of the cell is improved. Through the contact between the grooves and the grid lines, the electric connection between the grid lines and the battery piece is realized, the high-temperature sintering process of the battery piece can be cancelled, the energy consumption in the production process of the battery piece is favorably reduced, and the warping phenomenon of the battery piece is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic components, in particular to a battery sheet, a battery string, a photovoltaic component and a photovoltaic power generation system. Background Art

[0002] In existing technology, cells are designed with fine grids to collect photogenerated carriers generated by the photovoltaic cells under light conditions. The photogenerated carriers are collected along the fine grids and then transferred to the metal welding strips on the main grid. The main grid and fine grids are primarily made of high-content silver, but silver is expensive. Silver is typically printed onto the cell surface in the form of silver paste. The printing process and paste properties lead to high production costs for the cell. Furthermore, the fine grid lines are tall, and the fine grids easily block the light-receiving surface of the cell, resulting in low photovoltaic conversion efficiency. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the first object of the present invention is to provide a solar cell that can improve the photoelectric conversion efficiency of the solar cell.

[0004] The second object of the present invention is to provide a battery string comprising the battery cells described in the above embodiment.

[0005] The third object of the present invention is to provide a photovoltaic module, comprising the cell sheet or cell string described in the above embodiment.

[0006] The fourth object of the present invention is to provide a photovoltaic power generation system, comprising the solar cells, solar cell strings or photovoltaic modules described in the above embodiments.

[0007] According to the first embodiment of the present invention, the battery cell comprises a battery cell body and at least one grid line, wherein at least one groove is formed on at least one side surface of the battery cell body, the grid line is arranged in the groove, and the grid line is electrically connected to the battery cell body.

[0008] According to the solar cell of the embodiment of the present invention, the solar cell body is suitable for converting light energy into electrical energy, and the grid lines are suitable for extracting the current generated by the solar cell body. The solar cell body is formed with a groove. Placing the grid lines in the groove reduces the impact of the grid lines on the effective illumination area of ​​the solar cell. It also allows the grid lines to more effectively collect the current generated by the solar cell body, thereby improving the photoelectric conversion efficiency of the solar cell. Through the contact between the groove and the grid lines, the grid lines and the solar cell are electrically connected, which can eliminate the high-temperature sintering process of the solar cell, thereby reducing energy consumption during the solar cell production process and preventing solar cell warping.

[0009] In some embodiments, the width of the groove is L, and L satisfies: 0.02 mm ≤ L ≤ 0.1 mm.

[0010] In some embodiments, the cross-sectional contour line of the groove is a plurality of straight line segments connected in sequence, or at least one arc segment, or a combination of straight line segments and arc segments.

[0011] In some embodiments, the width of the gate line is less than or equal to the width of the groove.

[0012] In some embodiments, the height of the grid line in the thickness direction of the battery cell body is H, and H satisfies: 0.1 mm ≤ H ≤ 0.4 mm.

[0013] In some embodiments, at least one end of the groove passes through the surface of the corresponding side of the battery cell body, and the end of the grid line corresponding to the at least one end of the groove extends beyond the surface of the corresponding side of the battery cell body.

[0014] In some embodiments, a conductive layer and a reflective layer are provided on the gate line, wherein the conductive layer is provided on a surface of the gate line facing the groove, and the reflective layer is provided on a surface of the gate line away from the groove.

[0015] In some embodiments, the gate line includes: a copper substrate and a tin layer, wherein the tin layer covers an outer surface of the copper substrate.

[0016] In some embodiments, the cross-sectional shape of the gate line is circular, elliptical, oblong or polygonal.

[0017] In some embodiments, a plurality of grooves are formed on both side surfaces of the battery cell body in the thickness direction; there are a plurality of gate lines, and the plurality of gate lines are respectively arranged in the plurality of grooves.

[0018] A battery string according to an embodiment of the second aspect of the present invention includes: a plurality of battery cells, wherein the battery cells are the battery cells according to the embodiment of the first aspect of the present invention, and two adjacent battery cells are electrically connected.

[0019] In some embodiments, the two adjacent battery cells are respectively a first battery cell and a second battery cell, and a plurality of first grid lines and a plurality of second grid lines are respectively provided on both sides of the thickness direction of the first battery cell and the second battery cell, and the plurality of first grid lines of the first battery cell are electrically connected to the plurality of second grid lines of the second battery cell.

[0020] In some embodiments, the battery cell further comprises a conductive connector, through which two adjacent battery cells are electrically connected.

[0021] The photovoltaic assembly according to the third embodiment of the present invention includes the solar cell according to the first embodiment of the present invention, or the solar cell string according to the second embodiment of the present invention.

[0022] The photovoltaic power generation system according to the fourth embodiment of the present invention is characterized in that it includes the battery cell according to the first embodiment of the present invention, or the battery string according to the second embodiment of the present invention, or the photovoltaic module according to the third embodiment of the present invention.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 is a schematic cross-sectional view of a battery cell according to an embodiment of the present utility model;

[0026] Figure 2 This is a schematic diagram of a battery cell body and grid lines according to an embodiment of the present utility model;

[0027] Figure 3 is a schematic diagram of an embodiment of a battery string according to an embodiment of the present utility model;

[0028] Figure 4 Schematic diagram of another embodiment of a battery string according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] 100. Battery string;

[0031] 10. Cell; 11. Cell body; 12. Groove; 13. Gate line; 14. Conductive layer; 15. Reflective layer; 16. First cell; 17. Second cell; 18. Conductive connector;

[0032] A, first direction; B, second direction; C, thickness direction. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-4 A cell 10 according to an embodiment of the present invention is described, including a cell body 11 and at least one grid line 13 . The cell 10 has a first direction A, a second direction B, and a thickness direction C.

[0034] Specifically, if Figures 1-4 As shown, at least one groove 12 is formed on at least one side surface of the cell body 11 , and a gate line 13 is disposed in the groove 12 . The gate line 13 is electrically connected to the cell body 11 .

[0035] Combine Figure 1-Figure 3 The groove 12 is formed by at least a portion of at least one side surface of the battery cell body 11 being recessed along the thickness direction C of the battery cell 10, and the groove 12 extends along the first direction A of the battery cell 10. The gate line 13 extends along the first direction A of the battery cell 10. The main function of the gate line 13 is to collect the current generated on the battery cell 10 and lead it to the external circuit. At least a portion of the gate line 13 is embedded in the groove 12. A plurality of grooves 12 are formed on the battery cell body 11, and the plurality of grooves 12 are evenly spaced along the second direction B of the battery cell 10. The plurality of gate lines 13 correspond one to one to the plurality of grooves 12. The gate line 13 is welded to the inner wall surface of the groove 12 to form an ohmic contact to ensure the electrical connection between the gate line 13 and the battery cell body 11, reduce resistance and enable the gate line 13 to better collect current.

[0036] According to the solar cell 10 of the embodiment of the present invention, the solar cell body 11 is suitable for converting light energy into electrical energy, and the gate line 13 is suitable for leading the current generated by the solar cell body 11. A groove 12 is formed on the solar cell body 11. Placing the gate line 13 in the groove 12 reduces the impact of the gate line 13 on the effective illumination area of ​​the solar cell 10. It also allows the gate line 13 to more effectively collect the current generated by the solar cell body 11, thereby improving the photoelectric conversion efficiency of the solar cell 10. Through the contact between the groove 12 and the gate line 13, the electrical connection between the gate line 13 and the solar cell 10 is achieved, which can eliminate the high-temperature sintering process of the solar cell 10, thereby reducing energy consumption during the production process of the solar cell 10 and preventing the solar cell 10 from warping.

[0037] According to some embodiments of the present invention, Figure 1 As shown, the width of the groove 12 is L, and L satisfies: 0.02 mm ≤ L ≤ 0.1 mm.

[0038] The width of the groove 12 directly affects the light capture efficiency of the surface of the battery cell 10. If the width of the groove 12 is less than 0.02 mm, the width of the groove 12 is too narrow, resulting in the grid line 13 accommodated in the groove 12 being too thin, increasing the processing difficulty of the grid line 13 and the groove 12, and increasing the production cost of the battery cell 10; if the width of the groove 12 is greater than 0.1 mm, the width of the groove 12 is too wide, resulting in an excessively large shading area, affecting the light absorption efficiency of the battery cell 10.

[0039] Therefore, the width range of the groove 12 is limited to accommodate the gate line 13 of necessary width, thereby ensuring good current collection efficiency and reducing the light-shielding area to improve the light absorption efficiency of the cell 10 .

[0040] According to some embodiments of the present invention, Figure 1 and Figure 2 As shown, the cross-sectional contour line of the groove 12 is a plurality of straight line segments connected in sequence, or at least one arc segment, or a combination of straight line segments and arc segments.

[0041] That is, the groove 12 can be a concave V-shaped groove 12, a semicircular groove 12, or a trapezoidal groove 12, but is not limited thereto. The gate line 13 is disposed in the groove 12, and the outer peripheral wall of the gate line 13 contacts at least a portion of the inner wall of the groove 12, forming an ohmic contact between the outer peripheral wall of the gate line 13 and the inner wall of the groove 12.

[0042] Therefore, the cross-sectional area of ​​the groove 12 is a plurality of straight line segments connected in sequence, or at least one arc segment, or a combination of straight line segments and arc segments, which can increase the contact area between the gate line 13 and the groove 12, ensure the stability of the connection between the gate line 13 and the battery cell 10, and ensure that there is a good electrical connection between the gate line 13 and the battery cell body 11, which is conducive to the effective collection and transmission of current.

[0043] According to some embodiments of the present invention, Figure 2 As shown, the width of the gate line 13 is less than or equal to the width of the groove 12 .

[0044] The gate lines 13 can be placed completely within the grooves 12 without extending beyond the edges of the grooves 12, ensuring good contact between the gate lines 13 and the surface of the cell body 11, ensuring stable current transmission, and maintaining good current collection. Furthermore, the gate lines 13 will not be too wide, thereby preventing them from blocking more effective light-irradiated areas. This reduces the shielding of incident light by the gate lines 13, thereby improving the light absorption efficiency of the cell 10.

[0045] Therefore, by optimizing the design between the gate line 13 and the groove 12 , the best light absorption efficiency and current collection effect of the cell 10 can be achieved, the photoelectric conversion efficiency of the cell 10 can be improved, and thus the overall performance of the cell 10 can be improved.

[0046] According to some embodiments of the present invention, Figure 2 As shown, the height of the grid line 13 in the thickness direction C of the battery cell body 11 is H, and H satisfies: 0.1 mm≤H≤0.4 mm.

[0047] At least a portion of the gateline 13 is disposed within the groove 12. At least a portion of the gateline 13 protrudes from the groove 12 along the thickness direction C of the cell body 11. The surface of the portion of the gateline 13 protruding from the groove 12 can serve as an additional reflective surface, scattering and reflecting light. This allows the light to travel a longer path along the surface of the cell 10, thereby increasing the chance of light being absorbed and thereby improving the light absorption efficiency of the cell 10. The taller the gateline 13, the higher the reflectivity of the gateline 13. If the height of the gateline 13 in the thickness direction C of the cell body 11 is less than 0.1 mm, the reflectivity of the gateline 13 is too low, and the function of the gateline 13 as an additional reflective surface is weakened, which is not conducive to improving the light absorption efficiency of the cell 10. If the height of the gateline 13 in the thickness direction C of the cell body 11 is greater than 0.4 mm, the gateline 13 is too high, which increases the shielding of the incident light by the gateline 13, resulting in a reduction in the effective illuminated area of ​​the cell 10. This, in particular, results in significant light loss in the case of oblique incident light.

[0048] Therefore, limiting the height range of the grid line 13 in the thickness direction C of the cell body 11 can ensure that the function of the grid line 13 as an additional reflective surface is fully utilized, while avoiding the adverse effects of too high or too low height on light scattering and reflection effects. It also helps to reduce the shielding of incident light by the grid line 13, thereby minimizing the light energy loss caused by shading, and effectively improving the light absorption efficiency of the cell 10.

[0049] According to some embodiments of the present invention, Figure 1 and Figure 2 As shown, at least one end of the groove 12 passes through the surface of the corresponding side of the battery cell body 11 , and the end of at least one end of the grid line 13 corresponding to the groove 12 extends beyond the surface of the corresponding side of the battery cell body 11 .

[0050] The groove 12 extends along the first direction A of the battery cell 10, that is, at least one end of the groove 12 passes through the corresponding side surface of the battery cell body 11 along the first direction A. The gate line 13 extends along the first direction A of the battery cell 10, and the end of at least one end of the gate line 13 corresponding to the groove 12 extends to the surface beyond the corresponding side of the battery cell body 11, that is, at least one end of the gate line 13 exceeds the corresponding side surface of the battery cell body 11 along the first direction A.

[0051] Thus, the arrangement of the groove 12 facilitates the arrangement of the gate line 13, and the end of at least one end of the gate line 13 corresponding to the groove 12 extends beyond the surface of the corresponding side of the battery cell body 11 to facilitate connection with the external circuit.

[0052] According to some embodiments of the present invention, Figure 2As shown, a conductive layer 14 and a reflective layer 15 are provided on the gate line 13 . The conductive layer 14 is provided on a surface of the gate line 13 facing the groove 12 , and the reflective layer 15 is provided on a surface of the gate line 13 away from the groove 12 .

[0053] The main function of the conductive layer 14 is to ensure good ohmic contact between the gate line 13 and the cell 10, so as to effectively collect the current generated by the cell 10. The main function of the reflective layer 15 is to scatter and reflect light incident on the surface of the cell 10, thereby increasing the path length of the light on the surface of the cell 10 and improving the light absorption efficiency.

[0054] Therefore, the conductive layer 14 and the reflective layer 15 are provided on the gate line 13 , which can effectively improve the light-end conversion efficiency and the light-collecting efficiency of the cell 10 , thereby improving the overall performance of the cell 10 .

[0055] According to some embodiments of the present invention, Figure 2 As shown, the gate line 13 includes: a copper substrate and a tin layer, wherein the tin layer covers the outer surface of the copper substrate.

[0056] The copper substrate is the main support structure of the grid line 13 and is responsible for the task of current transmission. Copper is an excellent conductive material with a low resistivity. Copper has good electrical conductivity and can ensure that the energy loss during the current transmission process is small. The main function of the tin layer is to protect the copper substrate from corrosion, prevent the copper substrate from oxidation and affect the resistance, and extend the service life of the grid line 13. Tin is a metal with good welding properties, which can ensure good contact between the grid line 13 and the battery cell 10. The tin layer covering the outer surface of the copper substrate is conducive to improving the surface reflectivity of the grid line 13.

[0057] Therefore, the gate lines 13 comprise a copper substrate and a tin layer, which effectively improves the mechanical strength of the gate lines 13 and ensures the current transmission performance of the gate lines 13, extending the service life of the gate lines 13 and improving the durability and reliability of the cell 10. Copper and tin have low production costs, and the gate lines 13 comprising a copper substrate and a tin layer also help reduce the production cost of the cell 10.

[0058] According to some embodiments of the present invention, Figure 2 As shown, the cross-sectional shape of the gate line 13 is circular, elliptical, oblong or polygonal.

[0059] The cross-sectional shape of the grid line 13 can be circular, elliptical, oblong or polygonal. These shapes are selected to increase the contact area between the grid line 13 and the groove 12 and optimize the current collection efficiency and overall performance of the battery cell 10.

[0060] According to some embodiments of the present invention, Figure 3As shown, a plurality of grooves 12 are formed on both side surfaces of the cell body 11 in the thickness direction C. There are a plurality of gate lines 13 , and the gate lines 13 are respectively arranged in the plurality of grooves 12 .

[0061] A plurality of grooves 12 are formed on both side surfaces of the cell body 11 along the thickness direction C, and a corresponding grid line 13 is provided in each groove 12. This arrangement can improve the light absorption efficiency and current collection efficiency on the cell body 11, thereby improving the overall photoelectric conversion efficiency and current collection efficiency of the cell 10, and improving the overall performance of the cell body 11.

[0062] According to the second embodiment of the present invention, the battery string 100 is as follows: Figure 3 and Figure 4 As shown, the battery string 100 includes: a plurality of battery cells 10, the battery cells 10 are the battery cells 10 according to the embodiment of the first aspect of the present invention, and two adjacent battery cells 10 are electrically connected.

[0063] According to the battery string 100 of this practical embodiment, by applying the battery cells 10 of the above embodiment, multiple battery cells 10 are connected in series, which can improve the overall photoelectric conversion efficiency and current collection efficiency of the battery string 100, improve the overall performance of the battery string 100, reduce the production cost of the battery string 100, and extend the service life of the battery string 100.

[0064] According to some embodiments of the present invention, Figure 4 As shown, two adjacent battery cells 10 are respectively a first battery cell 16 and a second battery cell 17, and a plurality of first grid lines 13 and a plurality of second grid lines 13 are respectively provided on both sides of the thickness direction C of the first battery cell 16 and the second battery cell 17, and the plurality of first grid lines 13 of the first battery cell 16 are electrically connected to the plurality of second grid lines 13 of the second battery cell 17.

[0065] Multiple first gate lines 13 on the first cell 16 extend along a first direction A of the cell 10, and multiple first gate lines 13 are evenly spaced apart on the first cell 16 along a second direction B of the cell 10. Multiple second gate lines 13 on the second cell 17 extend along the first direction A of the cell 10, and multiple second gate lines 13 are evenly spaced apart on the second cell 17 along the second direction B of the cell 10. The multiple first gate lines 13 correspond to the second gate lines 13 one-to-one, and the corresponding first gate lines 13 are continuous with the corresponding second gate lines 13.

[0066] Therefore, the setting of electrically connecting the multiple first grid lines 13 of the first battery cell 16 and the multiple second grid lines 13 of the second battery cell 17 helps to simplify the connection between the battery cells 10 and ensure the continuity and transmission efficiency of the current transmission between the first battery cell 16 and the second battery cell 17, so as to ensure reliable electrical connection between adjacent battery cells 10, thereby improving the overall reliability of the battery string 100.

[0067] According to some embodiments of the present invention, Figure 4 As shown, it also includes: a conductive connector 18 , and two adjacent battery cells 10 are electrically connected through the conductive connector 18 .

[0068] In some embodiments, a conductive connector 18 is provided on one side surface of the first cell 16 and the second cell 17. The conductive connector 18 is suitable for being welded to the grid line 13. The adjacent first cell 16 and second cell 17 are connected by the conductive connector 18, forming a continuous current transmission path. In some embodiments, the first cell 16 is not provided with the conductive connector 18, and a side surface of the second cell 17 is provided with the conductive connector 18. The first grid line 13 on one side surface of the first cell 16 is suitable for being electrically connected to the conductive connector 18 of the second cell 17, forming an electrical connection between the first cell 16 and the second cell 17.

[0069] Therefore, by using the conductive connector 18 to electrically connect the first grid line 13 and the second grid line 13 of two adjacent battery cells 10 inside the battery string 100, the overall performance and reliability of the battery string 100 can be improved, which helps to simplify the connection between the battery cells 10 and ensure the continuity and efficiency of current transmission.

[0070] The photovoltaic assembly according to the third embodiment of the present invention includes the cell 10 according to the first embodiment of the present invention, or the cell string 100 according to the second embodiment of the present invention.

[0071] According to the photovoltaic module of the embodiment of the present invention, by applying the battery cell 10 or battery string 100 in the above embodiment, the photoelectric conversion efficiency of the photovoltaic module can be effectively improved, the reliability of the photovoltaic module can be improved, the production cost of the photovoltaic module can be reduced, and the service life of the photovoltaic module can be extended.

[0072] The photovoltaic power generation system according to the fourth embodiment of the present invention includes the battery cell 10 according to the first embodiment of the present invention, or the battery string 100 according to the second embodiment of the present invention, or the photovoltaic module according to the third embodiment of the present invention.

[0073] According to the photovoltaic power generation system of the embodiment of the present invention, by applying the battery cell 10, battery string 100 or photovoltaic module in the above embodiment, the overall power generation efficiency of the photovoltaic power generation system can be improved, energy consumption can be reduced, and the overall performance of the photovoltaic power generation system can be improved.

[0074] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0075] In the description of the present invention, "first feature" and "second feature" may include one or more of the features. In the description of the present invention, "plurality" means two or more. In the description of the present invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact via another feature between them. In the description of the present invention, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0076] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0077] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A battery cell body, wherein at least one groove is formed on at least one side surface of the battery cell body; At least one gate line is disposed in the groove and electrically connected to the battery cell body.

2. The battery cell according to claim 1, characterized in that: The width of the groove is L, and L satisfies: 0.02mm≤L≤0.1mm.

3. The battery cell according to claim 1, wherein: The cross-sectional contour line of the groove is a plurality of straight line segments connected in sequence, or at least one arc segment, or a combination of straight line segments and arc segments.

4. The battery cell according to claim 1, wherein: The width of the gate line is less than or equal to the width of the groove.

5. The battery cell according to claim 1, characterized in that: The height of the grid line in the thickness direction of the battery cell body is H, and H satisfies: 0.1 mm ≤ H ≤ 0.4 mm.

6. The battery cell according to claim 1, characterized in that: At least one end of the groove passes through the surface of the corresponding side of the battery cell body, and the end of the grid line corresponding to the at least one end of the groove extends beyond the surface of the corresponding side of the battery cell body.

7. The battery cell according to claim 1, characterized in that: A conductive layer and a reflective layer are provided on the gate line. The conductive layer is provided on a surface of the gate line facing the groove, and the reflective layer is provided on a surface of the gate line away from the groove.

8. The battery cell according to claim 1, wherein: The grid line includes: Copper substrate; A tin layer covers the outer surface of the copper substrate.

9. The battery cell according to claim 1, characterized in that: The cross-sectional shape of the grid lines is circular, elliptical, oblong or polygonal.

10. The battery cell according to any one of claims 1 to 9, characterized in that: A plurality of grooves are formed on both side surfaces of the battery cell body in the thickness direction; There are a plurality of gate lines, and the plurality of gate lines are respectively arranged in a plurality of grooves.

11. A battery string, characterized in that: include: A plurality of battery cells, wherein the battery cells are the battery cells according to any one of claims 1 to 10, and two adjacent battery cells are electrically connected.

12. The battery string according to claim 11, characterized in that The two adjacent battery cells are respectively a first battery cell and a second battery cell, and a plurality of first grid lines and a plurality of second grid lines are respectively provided on both sides of the thickness direction of the first battery cell and the second battery cell, and the plurality of first grid lines of the first battery cell are electrically connected to the plurality of second grid lines of the second battery cell.

13. The battery string according to claim 11 or 12, characterized in that: Also includes: A conductive connector, through which two adjacent battery cells are electrically connected.

14. A photovoltaic module, characterized in that: The method comprises the battery cell according to any one of claims 1 to 10, or the battery string according to any one of claims 11 to 13.

15. A photovoltaic power generation system, characterized in that: The method comprises the cell according to any one of claims 1 to 10, or the cell string according to any one of claims 11 to 13, or the photovoltaic module according to claim 14.

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