Solar cell piece, cell assembly and photovoltaic system

Abstract

The utility model discloses a solar cell sheet, a cell assembly and a photovoltaic system, and the solar cell sheet comprises a cell substrate which is provided with a first edge and a second edge in a first direction; the grid line structure is arranged on the back face of the battery substrate, and the grid line structure comprises first grid lines and second grid lines which are alternately arranged in the second direction; the Pad points comprise first Pad points and second Pad points, the first Pad points and the second Pad points are alternately arranged in the first direction, the first Pad points are electrically connected with the first grid lines, and the second Pad points are electrically connected with the second grid lines; discontinuous regions are formed between the first Pad point and the first grid line and between the first Pad point and the second grid line, and between the second Pad point and the first grid line and between the second Pad point and the second grid line; and the marking structure comprises at least one Mark point, and the Mark point is arranged in the discontinuous region closest to the first edge and / or the second edge. By adopting the solar cell provided by the utility model, the printing quality and the grabbing stability of the marking structure can be improved, so that the production efficiency of the solar cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cells, in particular to a solar cell sheet, a battery assembly and a photovoltaic system. Background Art

[0002] To prevent the mark points from blocking the light-receiving area of ​​the solar cell, the existing technology generally places the mark points in an area outside the grid line structure, that is, at the edge of the solar cell. When printing the grid line and other solar cell structures, the camera is used to capture the mark points to achieve accurate printing of the solar cell structure. However, when the mark points are placed at the edge of the solar cell, in the actual production process, printing defects such as false printing and scratches may occur. These reasons will lead to edge capture failure, ultimately affecting the printing of the solar cell structure. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a solar cell, a battery assembly and a photovoltaic system, which can realize the precise identification and capture of the marking structure of the solar cell, thereby realizing the accurate printing of the solar cell structure.

[0004] In order to solve the above technical problems, the present invention provides a solar cell comprising:

[0005] A battery substrate having a first edge and a second edge in a first direction;

[0006] A grid line structure, the grid line structure being arranged on the back side of the battery substrate, the grid line structure comprising first grid lines and second grid lines alternately arranged along a second direction;

[0007] Pad points, the pad points including first pad points and second pad points alternately arranged along a first direction, the first pad points being electrically connected to the first gate line, and the second pad points being electrically connected to the second gate line; discontinuity areas are formed between the first pad points and the first gate line and the second gate line, as well as between the second pad points and the first gate line and the second gate line;

[0008] The marking structure includes at least one mark point, and the mark point is set in the discontinuity area closest to the first edge and / or the second edge.

[0009] As an improvement of the above solution, each of the discontinuous areas includes a first discontinuous partition close to the first edge and / or the second edge and a second discontinuous partition close to the center of the battery substrate, and the Mark point is set in the first discontinuous partition.

[0010] As an improvement to the above solution, the first pad point includes a first pad point partition A and a first pad point partition B, and the first pad point partition A and the first pad point partition B are connected; the second pad point includes a second pad point partition A and a second pad point partition B, and the second pad point partition A and the second pad point partition B are connected;

[0011] Along the first direction, the length of the first Pad point partition A is smaller than the length of the first Pad point partition B; the length of the second Pad point partition A is smaller than the length of the second Pad point partition B.

[0012] As an improvement of the above-mentioned scheme, the Mark point is arranged above the first Pad point partition B and is located in the first intermittent partition close to the first Pad point partition A; and / or, the Mark point is arranged above the second Pad point partition B and is located in the first intermittent partition close to the second Pad point partition A.

[0013] As an improvement to the above solution, the marking structure includes:

[0014] a first mark point located in the discontinuity area closest to the first edge;

[0015] a second mark point located in the discontinuity area closest to the second edge;

[0016] As an improvement to the above solution, the battery substrate has a third edge and a fourth edge in the second direction;

[0017] Along the second direction, the distance between the first Mark point and the third edge is not equal to the distance between the second Mark point and the third edge.

[0018] As an improvement to the above solution, the marking structure includes:

[0019] A first mark point is located in the discontinuity area closest to the first edge and the third edge;

[0020] A second mark point is located in the discontinuity area closest to the second edge and the third edge;

[0021] a third mark point located in the discontinuity region closest to the first edge and the fourth edge;

[0022] A fourth mark point is located in the discontinuous area closest to the second edge and the fourth edge.

[0023] As an improvement to the above solution, along the first direction, the distances between the first Mark point and the third Mark point and the first edge are equal, and / or the distances between the second Mark point and the fourth Mark point and the second edge are equal.

[0024] As an improvement to the above solution, along the second direction, the distance between the first Mark point and the third Mark point is not equal to the distance between the second Mark point and the fourth Mark point.

[0025] As an improvement to the above solution, along the second direction, the distance between the first Mark point and the second Mark point is equal to the distance between the third Mark point and the fourth Mark point.

[0026] As an improvement to the above solution, a first doping region and a second doping region with opposite polarities are provided on the back of the battery substrate, the first gate line is provided on the first doping region, and the second gate line is provided on the second doping region;

[0027] The Mark point and the adjacent Pad point are arranged on doping regions of the same polarity.

[0028] As an improvement to the above solution, along the first direction, the distance between the Mark point and the adjacent Pad point is 0.05 mm to 2 mm.

[0029] As an improvement to the above solution, along the first direction, the distance between the Mark point and the adjacent grid line is 0.05 mm to 2 mm.

[0030] As an improvement to the above solution, along the first direction, the distance between the Mark point and the first edge and / or the second edge is 0.1 mm to 20 mm.

[0031] As an improvement of the above solution, the shape of the Mark point is one or more of a circle, a square, a triangle, a five-pointed star, a regular hexagon, and a cross.

[0032] As an improvement of the above solution, the length of the Mark point is 0.1mm to 2mm, and the width is 0.1mm to 2mm.

[0033] As an improvement of the above solution, the Mark point is a solid circular Mark point, and the diameter of the Mark point is 0.1 mm to 2 mm.

[0034] Correspondingly, the present invention provides a battery assembly including the above-mentioned solar cell.

[0035] Accordingly, the present invention provides a photovoltaic system including the above-mentioned battery assembly.

[0036] The implementation of this utility model has the following beneficial effects:

[0037] This new method moves the marking structure from the edge of the solar cell to the discontinuity zone formed between the pad point closest to the edge of the solar cell and the grid line. This avoids problems such as false printing and scratches caused by placing the marking structure at the edge of the cell. Furthermore, placing the marking structure within the discontinuity zone does not affect the current collection effect of the grid line structure, ultimately achieving precise printing of the solar cell structure while ensuring the quality of the solar cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the partial structure of the solar cell provided by the utility model;

[0039] Figure 2 This is a schematic structural diagram of a solar cell provided by one embodiment of the present invention;

[0040] Figure 3 This is a schematic structural diagram of a solar cell provided by another embodiment of the present invention;

[0041] Figure 4 yes Figure 3 A schematic diagram of the position of the marking structure of the solar cell;

[0042] Figure 5 This is a schematic structural diagram of a solar cell provided by another embodiment of the present invention;

[0043] Figure 6 yes Figure 5 A schematic diagram of the position of the marking structure of the solar cell;

[0044] Figure 7 It is a schematic diagram of the dimensions of the marking structure provided in one embodiment of the present utility model. DETAILED DESCRIPTION

[0045] The following describes embodiments of the present invention with reference to the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0046] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positions, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0048] In addition, the directional terms such as "upper", "lower", "left", "right", "front", "back", "inside", and "outside" appearing in the text are only based on the drawings of the present invention and do not specifically limit the present invention.

[0049] like Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a solar cell, including a cell substrate 1, a grid line structure 2, a Pad point 3 and a marking structure 4, wherein the cell substrate 1 has a first edge 11 and a second edge 12 in a first direction; the grid line structure 2 is arranged on the back side of the cell substrate 1, and the grid line structure 2 includes a first grid line 21 and a second grid line 22 alternately arranged along the second direction; the Pad point 3 includes a first Pad point 31 and a second Pad point 32 alternately arranged along the first direction, the first Pad point 31 and the first grid line 21 are electrically connected, and the second Pad point 32 and the second grid line 22 are electrically connected; a discontinuity area 5 is formed between the first Pad point 31 and the first grid line 21 and the second grid line 22, as well as between the second Pad point 32 and the first grid line 21 and the second grid line 22; the marking structure 4 includes at least one Mark point, and the Mark point is arranged in the discontinuity area 5 closest to the first edge 11 and / or the second edge 12.

[0050] The existing marking structure is generally set in the non-grid line structure area at the edge of the solar cell. Although setting the marking structure at the edge of the solar cell can avoid adverse effects on the current collection effect of the grid line structure, setting the marking structure at the edge of the solar cell will cause printing problems such as virtual printing and scratches, which is not conducive to the performance improvement of the solar cell. In the embodiment of the present invention, a discontinuity zone 5 is formed between the first Pad point 31 and the first grid line 21 and the second grid line 22, and between the second Pad point 32 and the first grid line 21 and the second grid line 22. The marking structure 4 is set in the discontinuity zone closest to the edge of the solar cell. Under the premise of not affecting the current collection effect of the grid line structure, the adverse effects caused by the printing of the marking structure can be reduced. The Mark point is used to identify the printing position of the material (such as the insulating layer, the grid line, etc.) on the battery substrate, and the battery substrate or the printing screen is moved to adjust the printing position, thereby ultimately improving the printing accuracy of the solar cell material and the quality of the solar cell.

[0051] Optionally, in one embodiment, the first direction and the second direction intersect; preferably, the first direction and the second direction are perpendicular to each other; more preferably, the first direction is the lateral direction of the battery substrate 1, and the second direction is the longitudinal direction of the battery substrate 1, and the two are perpendicular to each other.

[0052] It can be understood that each of the discontinuous areas 5 includes a first discontinuous partition 51 close to the first edge 11 and / or the second edge 12 and a second discontinuous partition 52 close to the center of the battery substrate 1. In a preferred embodiment, the Mark point is arranged in the first discontinuous partition 51, that is, the Mark point is closer to the first edge 11, or the Mark point is closer to the second edge 12. The area between the Pad point closest to the first edge 11 and / or the second edge 12 and the first edge 11 and / or the second edge 12 of the solar cell contributes less to the current collection than the entire solar cell. Therefore, arranging the mark structure in the first discontinuous partition 51 can further reduce the influence of the mark structure 4 on the current collection ability of the gate line structure 2.

[0053] The first pad point 31 includes a first pad point partition A311 and a first pad point partition B312, and the first pad point partition A311 and the first pad point partition B312 are connected; the second pad point 32 includes a second pad point partition A321 and a second pad point partition B322, and the second pad point partition A321 and the second pad point partition B322 are connected;

[0054] Along the first direction, the length of the first Pad point partition A311 is less than the length of the first Pad point partition B312; the length of the second Pad point partition A321 is less than the length of the second Pad point partition B322. That is, the Pad point forms two Pad point partitions of different lengths along the first direction. The first Pad point partition B312 and the second Pad point partition B322 with longer lengths can ensure the current collection capability, the first Pad point partition A311 with shorter length can increase the length of the second gate line 22 interrupted with it, and the second Pad point partition A321 can increase the length of the first gate line 21 interrupted with it, thereby improving the current collection capability of the gate lines in the corresponding areas.

[0055] In order to reduce the influence of the setting of the Mark point on the gate line structure 2, in a preferred embodiment, the Mark point is set above the first Pad point partition B312 and is located in the first discontinuous partition 51 close to the first Pad point partition A311; and / or, the Mark point is set above the second Pad point partition B322 and is located in the first discontinuous partition 51 close to the second Pad point partition A321. Setting the Mark point on the side of the first Pad point partition B312 and / or the second Pad point partition B322 with a shorter length can reduce the influence of the Mark point setting on the length of the gate line intermittently set therewith, thereby ensuring the gate line's ability to collect current.

[0056] As a case, Figure 3 and Figure 4 As shown, the marking structure includes a first mark point 41 and a second mark point 42. The first mark point 41 is located in the discontinuity zone 5 closest to the first edge 11, and the second mark point 42 is located in the discontinuity zone 5 closest to the second edge 12. Compared to setting a single mark point, setting a mark point in each of the discontinuity zones closest to the first edge and the second edge can improve recognition accuracy and ensure the precision of battery structure printing.

[0057] Specifically, the battery substrate 1 has a third edge 13 and a fourth edge 14 in the second direction; in a preferred embodiment, along the second direction, the distance between the first Mark point 41 and the third edge 13 is D1, and the distance between the second Mark point 42 and the third edge 13 is D2, D1≠D2, that is, the first Mark point 41 and the second Mark point 42 are asymmetrically arranged in the first direction. If the battery substrate 1 is rotated 90° or 180° during the printing of the battery structure, the material printing position on the battery substrate 1 may be offset from the printing screen position, resulting in excessive series resistance, reduced efficiency of the solar cell, and even the inability to extract current, etc., seriously affecting the performance and quality of the solar cell. Therefore, the asymmetrically arranged first Mark point 41 and second Mark point 42 can avoid the battery structure printing problem caused by the placement direction of the battery substrate 1 being different from the preset direction.

[0058] As another case, Figure 5 and Figure 6 As shown, the marking structure includes a first mark point 41, a second mark point 42, a third mark point 43, and a fourth mark point 44. The first mark point 41 is located in the discontinuity zone 5 closest to the first edge 11 and the third edge 13, the second mark point 42 is located in the discontinuity zone 5 closest to the second edge 12 and the third edge 13, the third mark point 43 is located in the discontinuity zone 5 closest to the first edge 11 and the fourth edge 14, and the fourth mark point 44 is located in the discontinuity zone 5 closest to the second edge 12 and the fourth edge 14. The marking structure 4 includes four mark points located in the upper left, upper right, lower left, and lower right discontinuity zones 5 of the battery substrate 1, respectively, which can improve the grasping accuracy of the marking structure 4 and reduce the probability of grasping problems.

[0059] In a preferred embodiment, along the first direction, the distance between the first Mark point 41 and the first edge 11 is L1, the distance between the third Mark point 43 and the first edge 11 is L2, L1=L2, and / or the distance between the second Mark point 42 and the second edge 12 is L3, and the distance between the fourth Mark point 44 and the second edge 12 is L4, L3=L4. That is, the line connecting the first Mark point 41 and the third Mark point 43 and / or the line connecting the second Mark point 42 and the fourth Mark point 44 is parallel to the edge of the battery substrate 1. This arrangement can simplify the calculation of printing position offset while ensuring the alignment accuracy of electrode printing.

[0060] In a preferred embodiment, along the second direction, the distance between the first Mark point 41 and the third Mark point 43 is D3, and the distance between the second Mark point 42 and the fourth Mark point 44 is D4, D3≠D4, that is, the quadrilateral formed by the lines connecting the first Mark point 41, the second Mark point 42, the third Mark point 43 and the fourth Mark point 44 is a trapezoid, thereby forming a marking structure 4 that is conducive to determining the placement direction of the battery substrate 1. The quadrilateral formed by the four Mark points cannot coincide with the original quadrilateral after being rotated 90° or 180°. Therefore, if the Mark point cannot be captured at a position where the Mark point should be captured, it can be determined that the placement direction of the battery substrate 1 is not the preset placement direction, and the placement direction of the battery substrate 1 can be adjusted in time.

[0061] In a preferred embodiment, along the second direction, the distance between the first Mark point 41 and the second Mark point 42 is D5, and the distance between the third Mark point 43 and the fourth Mark point 44 is D6, D5=D6, that is, the quadrilateral formed by the connecting lines of the first Mark point 41, the second Mark point 42, the third Mark point 43 and the fourth Mark point 44 is an isosceles trapezoid, thereby forming a marking structure 4 that is conducive to determining the placement direction of the battery substrate 1.

[0062] It is understood that the back side of the cell substrate 1 is provided with a first doped region and a second doped region of opposite polarity. The first gate line 21 is provided on the first doped region, and the second gate line 22 is provided on the second doped region. The mark point and the adjacent pad point are provided on the doped region of the same polarity. Based on this, the distance between the mark point and the adjacent pad point can be shortened, thereby increasing the length of the gate line provided intermittently with the pad point.

[0063] In a preferred embodiment, Figure 7As shown, along the first direction, the distance L5 between the Mark point and the adjacent Pad point is 0.05mm to 2mm. This refers to the minimum distance between the edge of the Mark point and the edge of the Pad point. For example, when the Mark point is the first Mark point 41 set in the discontinuous area 5 closest to the first edge 11, L5 is the distance between the edge of the first Mark point 41 away from the first edge 11 and the edge of the Pad point close to the first edge 11. If the distance L5 between the Mark point and the adjacent Pad point is less than 0.05mm, it is difficult to accurately identify the Mark point; if the distance L5 between the Mark point and the adjacent Pad point is greater than 2mm, the length of the gate line set discontinuously with the Pad point will be reduced, resulting in a decrease in current collection capability. For example, the distance D7 between the Mark point and the adjacent Pad point is 0.08mm, 0.2mm, 0.5mm, 1mm or 1.5mm, but is not limited to this.

[0064] In a preferred embodiment, Figure 7 As shown, along the first direction, the distance L6 between the Mark point and the adjacent gate line is 0.05mm to 2mm. This refers to the distance between the edge of the Mark point close to the adjacent gate line and the gate line. If the distance L6 between the Mark point and the adjacent gate line is less than 0.05mm, it is difficult to accurately identify the Mark point, and the distance between the first doping region and the second doping region will be too close, increasing the probability of a short circuit; if the distance L6 between the Mark point and the adjacent gate line is greater than 2mm, the Mark point and the Pad point will overlap, affecting the recognition accuracy and the current collection capability. Exemplarily, the distance L6 between the Mark point and the adjacent gate line is 0.08mm, 0.2mm, 0.5mm, 1mm or 1.5mm, but is not limited thereto.

[0065] In a preferred embodiment, Figure 7 As shown, along the first direction, the distance L7 between the mark point and the first edge and / or the second edge is 0.1 mm to 20 mm. This refers to the distance between the edge of the mark point close to the first edge 11 and the first edge 11 and / or the distance between the edge of the mark point close to the second edge 12 and the second edge 12. Exemplarily, the distance L7 between the mark point and the first edge and / or the second edge is 0.5 mm, 1 mm, 5 mm, 10 mm, or 15 mm, but is not limited thereto.

[0066] Optionally, the shape of the Mark point is one or more of a circle, a square, a triangle, a pentagon, a regular hexagon, and a cross. It is understandable that the shapes of the multiple Mark points may be the same or different, wherein Mark points of the same shape may reduce the complexity of preparation and improve the efficiency of grasping. In a preferred embodiment, the length of the Mark point is 0.1mm to 2mm, and the width is 0.1mm to 2mm. The length and width here refer to the distance of the Mark point in the first direction and the distance in the second direction. Exemplarily, the length of the Mark point is 0.15mm, 0.2mm, 0.5mm, 1mm or 1.5mm, but not limited thereto. The width of the Mark point is 0.15mm, 0.2mm, 0.5mm, 1mm or 1.5mm, but not limited thereto. If the length and / or width of the Mark point is too small, the difficulty of identification will increase. If the length and / or width of the Mark point is too large, the gate line structure will be shortened, affecting the current collection effect. More preferably, the Mark point is a solid circular Mark point, which is convenient for grasping. The diameter d1 of the Mark point is 0.1 mm to 2 mm, exemplarily 0.15 mm, 0.2 mm, 0.5 mm, 1 mm or 1.5 mm, but not limited thereto.

[0067] Correspondingly, an embodiment of the present invention further provides a battery assembly, comprising a first cover plate, a first adhesive film, at least one battery string, a second adhesive film, and a second cover plate stacked in sequence.

[0068] Specifically, the first cover plate is usually made of a material with high light transmittance and strong weather resistance, including but not limited to glass and polycarbonate. Its main function is to protect the sensitive components inside the battery assembly from the external environment, while providing the necessary mechanical support to ensure the structural integrity of the battery assembly.

[0069] The first adhesive film is located between the first cover plate and the battery string, primarily serving as a bonding and sealing mechanism to prevent delamination or leakage during long-term use of the battery assembly. Materials for the first adhesive film include, but are not limited to, ethylene vinyl acetate (EVA) and polyolefin (POE).

[0070] The second adhesive film is located between the battery string and the second cover plate, and has a similar function to the first adhesive film, mainly serving as bonding and sealing.

[0071] The second cover plate is usually made of weather-resistant materials, including but not limited to aluminum plates and backplane films. Its main function is to protect the back of the battery assembly from the influence of the external environment and provide additional mechanical support. It can also serve as an insulating layer for the battery assembly to ensure safe use.

[0072] The battery string includes the above-mentioned solar cells, and each battery string includes a plurality of solar cells connected in series. The plurality of solar cells can be partially overlapped to form a battery string. The contact areas between the overlaps are not conductively connected, that is, there is no need to set conductive glue or other adhesives between the overlapped areas. The solar cells are simply overlapped together. Optionally, the solar cells are electrically connected in the form of a whole piece or multiple pieces. The overlapping areas of adjacent solar cells in the battery string are provided with series welding ribbons to fixedly connect the adjacent solar cells, and the series welding ribbons connect the adjacent solar cells in series. Different battery strings are obtained by series and / or parallel connection.

[0073] The battery assembly is formed by sequentially laying a first cover plate, a first adhesive film, a plurality of battery strings, a second adhesive film, and a second cover plate, followed by a lamination process. The lamination process includes preheating, pressurized heating, and cooling and curing. Its purpose is to tightly bond the multiple stacked component materials under high temperature and high pressure to form an integrated structure. This utility model does not specifically limit the lamination process.

[0074] Accordingly, embodiments of the present invention further provide a photovoltaic system. It is understood that the photovoltaic system includes at least one battery assembly as described above. It is understood that the battery assemblies can be electrically connected in parallel or in series, and the specific configuration can be selected based on actual needs. The photovoltaic system can be used in photovoltaic power stations, such as ground-based power stations, rooftop power stations, and water-based power stations. It can also be used in equipment or devices that use solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these. In other words, the photovoltaic system can be used in all fields that require solar power generation. Taking a photovoltaic power generation system network as an example, the photovoltaic system can include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array can be an array combination of multiple battery assemblies. For example, multiple battery assemblies can form multiple photovoltaic arrays. The photovoltaic arrays are connected to a combiner box, which can combine the current generated by the photovoltaic arrays. The combined current flows through the inverter and is converted into AC power required by the mains power grid. After that, it is connected to the mains power grid to achieve solar power supply.

[0075] Throughout this specification, reference to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," 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 application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0076] The above is a detailed introduction to the solar cell panels, battery modules and photovoltaic systems provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A solar cell, characterized in that: include: A battery substrate having a first edge and a second edge in a first direction; A grid line structure, the grid line structure being arranged on the back side of the battery substrate, the grid line structure comprising first grid lines and second grid lines alternately arranged along a second direction; Pad points, the pad points including first pad points and second pad points alternately arranged along a first direction, the first pad points being electrically connected to the first gate line, and the second pad points being electrically connected to the second gate line; discontinuity areas are formed between the first pad points and the first gate line and the second gate line, as well as between the second pad points and the first gate line and the second gate line; The marking structure includes at least one mark point, and the mark point is set in the discontinuity area closest to the first edge and / or the second edge.

2. The solar cell according to claim 1, wherein: Each of the discontinuous areas includes a first discontinuous subarea close to the first edge and / or the second edge and a second discontinuous subarea close to the center of the battery substrate, and the mark point is set in the first discontinuous subarea.

3. The solar cell according to claim 2, wherein: The first pad point includes a first pad point partition A and a first pad point partition B, and the first pad point partition A and the first pad point partition B are connected; the second pad point includes a second pad point partition A and a second pad point partition B, and the second pad point partition A and the second pad point partition B are connected; Along the first direction, the length of the first Pad point partition A is smaller than the length of the first Pad point partition B; The length of the second Pad point partition A is smaller than the length of the second Pad point partition B.

4. The solar cell according to claim 3, wherein: The Mark point is located above the first Pad point partition B and is located in the first intermittent partition close to the first Pad point partition A; and / or, the Mark point is located above the second Pad point partition B and is located in the first intermittent partition close to the second Pad point partition A.

5. The solar cell according to claim 1, wherein: The tag structure includes: a first mark point located in the discontinuity area closest to the first edge; A second mark point is set in the discontinuous area closest to the second edge.

6. The solar cell according to claim 5, wherein: The battery substrate has a third edge and a fourth edge in the second direction; Along the second direction, the distance between the first Mark point and the third edge is not equal to the distance between the second Mark point and the third edge.

7. The solar cell according to claim 1, wherein: The tag structure includes: A first mark point is located in the discontinuity area closest to the first edge and the third edge; A second mark point is located in the discontinuity area closest to the second edge and the third edge; a third mark point located in the discontinuity region closest to the first edge and the fourth edge; A fourth mark point is located in the discontinuous area closest to the second edge and the fourth edge.

8. The solar cell according to claim 7, wherein: Along the first direction, the distances between the first Mark point and the third Mark point and the first edge are equal, and / or the distances between the second Mark point and the fourth Mark point and the second edge are equal.

9. The solar cell according to claim 7, wherein: Along the second direction, the distance between the first Mark point and the third Mark point is not equal to the distance between the second Mark point and the fourth Mark point.

10. The solar cell according to claim 9, wherein: Along the second direction, the distance between the first Mark point and the second Mark point is equal to the distance between the third Mark point and the fourth Mark point.

11. The solar cell according to claim 1, wherein: The back side of the battery substrate is provided with a first doping region and a second doping region with opposite polarities, the first gate line is provided on the first doping region, and the second gate line is provided on the second doping region; The Mark point and the adjacent Pad point are arranged on doping regions of the same polarity.

12. The solar cell according to claim 1, wherein: Along the first direction, the distance between the Mark point and the adjacent Pad point is 0.05 mm to 2 mm.

13. The solar cell according to claim 1, wherein: Along the first direction, the distance between the Mark point and the adjacent grid line is 0.05 mm to 2 mm.

14. The solar cell according to claim 1, wherein: Along the first direction, the distance between the Mark point and the first edge and / or the second edge is 0.1 mm to 20 mm.

15. The solar cell according to claim 1, wherein: The shape of the Mark point is one or more of a circle, a square, a triangle, a five-pointed star, a regular hexagon, and a cross.

16. The solar cell according to claim 1, wherein: The length of the Mark point is 0.1mm to 2mm, and the width is 0.1mm to 2mm.

17. The solar cell according to claim 16, wherein: The Mark point is a solid circular Mark point, and the diameter of the Mark point is 0.1 mm to 2 mm.

18. A battery assembly, characterized in that: The solar cell comprises the solar cell according to any one of claims 1 to 17.

19. A photovoltaic system, characterized in that: A battery assembly comprising the battery assembly of claim 18.

Images