Solar cell, photovoltaic module and photovoltaic system

Abstract

The embodiment of the utility model provides a solar cell, a photovoltaic module and a photovoltaic system. The solar cell comprises a cell piece and an electrode grid line structure arranged on the surface of the cell piece. The electrode grid line structure comprises an auxiliary grid, and the auxiliary grid comprises a plurality of first grid lines which are sequentially distributed in the first direction; wherein each first grid line comprises a plurality of grid line segments, and a part of the grid line segments are used as supporting lines, or a plurality of supporting lines are bridged between adjacent first grid lines; and the main grid is stacked on the supporting line. According to the embodiment of the invention, the auxiliary grid comprises the supporting lines, so that the auxiliary grid has a supporting effect, the firmness of the auxiliary grid is improved, and the grid lines are prevented from falling off; and meanwhile, the main grids are stacked on the supporting lines, so that the redundant shielding area is not increased, the grid line structure is firm and not easy to fall off, the absorption of sunlight is not influenced, and the photoelectric conversion efficiency of the solar cell is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic technology, and in particular to a solar cell, a photovoltaic module and a photovoltaic system. BACKGROUND

[0002] The electrode grid line structure of the solar cell includes main grids and sub-grids (also referred to as fine grids), the sub-grids are mainly responsible for collecting the current generated by the cell sheet, and the main grids are responsible for collecting and transmitting the current collected by the sub-grids to the outside of the cell. The existing electrode grid line structure usually includes multiple parallel sub-grids and multiple parallel main grids, the main grids and the sub-grids are arranged in parallel along directions perpendicular to each other, and in the process of printing the grid line structure, the main grids are usually printed first, and then the sub-grids are printed, the sub-grids are overlapped on the main grids. In this way, the adhesion between the grid lines (sub-grids and main grids) and the surface of the cell sheet is completely relied on to support, so that the firmness of the grid lines is insufficient and prone to risk, resulting in loss of solar cell efficiency, which is not conducive to the stable development of solar cells.

[0003] It should be noted that the above content is not necessarily prior art, and is not used to limit the patent protection scope of the present application. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide a solar cell, a photovoltaic module and a photovoltaic system to solve or alleviate one or more technical problems proposed above.

[0005] As a first aspect of the embodiments of the present application, the embodiments of the present application provide a solar cell, comprising a cell sheet and an electrode grid line structure arranged on the surface of the cell sheet; the electrode grid line structure comprises:

[0006] a sub-grid, the sub-grid comprising a plurality of first grid lines arranged in sequence along a first direction; wherein the first grid line comprises a plurality of grid line segments, and part of the grid line segments serve as support lines, or a plurality of support lines are connected between adjacent first grid lines;

[0007] a main grid, the main grid being arranged on the support lines.

[0008] In an implementation manner, the first grid line comprises a plurality of first inflection points and a plurality of second inflection points, and the first inflection points and the second inflection points are arranged alternately; the first inflection points and the second inflection points are located on opposite sides of the center line of the first grid line.

[0009] The first inflection point of the current first grid line coincides with the second inflection point of the adjacent first grid line; the adjacent first grid line is a first grid line adjacent to the current first grid line; the support line is a first grid line segment of the first grid line extended from the second inflection point to the first inflection point, and the first grid line segment of the adjacent first grid line is collinear with the first grid line segment of the current first grid line.

[0010] In an embodiment, positions of the plurality of first inflection points in the first grid line are kept flush, and positions of the plurality of second inflection points are kept flush.

[0011] In an embodiment, the first grid line comprises a second grid line segment extending from the first inflection point to the second inflection point; and the second grid line segment forms an angle of 30-75° with the first grid line segment.

[0012] In an embodiment, the plurality of second grid line segments are arranged in parallel, and a distance between adjacent second grid line segments is 1 / 20-1 / 10 of a dimension of the cell along a direction of the center line of the first grid line.

[0013] In an embodiment, the first grid line comprises a plurality of third inflection points and a plurality of fourth inflection points, and the third inflection points and the fourth inflection points are arranged alternately; and the third inflection points and the fourth inflection points are located on opposite sides of the center line of the first grid line.

[0014] The two ends of the support line are connected to the third inflection point of the current first grid line and the fourth inflection point of the adjacent first grid line, respectively; the adjacent first grid line is a first grid line adjacent to the current first grid line; and the adjacent first grid line is collinear with the support line of the current first grid line.

[0015] In an embodiment, positions of the plurality of third inflection points in the first grid line are kept flush, and positions of the plurality of fourth inflection points are kept flush.

[0016] In an embodiment, in the first grid line, an angle at the third inflection point or the fourth inflection point is 90-180°.

[0017] In an embodiment, the plurality of support lines are arranged in parallel, and a distance between adjacent support lines is 1 / 29-1 / 12 of a dimension of the cell along a direction of the center line of the first grid line.

[0018] In an embodiment, the first grid line is a straight line; the support line is arranged at an angle of 85-95° with the first grid line; and a distance between adjacent first grid lines is 1 / 20-1 / 10 of a dimension of the cell along a direction of the support line.

[0019] In an embodiment, the support lines on both sides of the first grid line are staggered.

[0020] In an embodiment, a number of the main grids is less than or equal to a number of the support lines on one side of the first grid line.

[0021] As a second aspect of the embodiments of the present application, the embodiments of the present application provide a photovoltaic module comprising the solar cell of any of the above embodiments.

[0022] As a third aspect of the embodiments of the present application, the embodiments of the present application provide a photovoltaic system comprising the photovoltaic module of any of the above embodiments.

[0023] The embodiment of the present application includes a support line in the auxiliary grid, so that the auxiliary grid itself has a support effect, improves the firmness of the auxiliary grid, and avoids the grid line from falling off. Meanwhile, the main grid is stacked on the support line, does not increase the redundant shielding area, so that the grid line structure has a firm structure and is not easy to fall off, and does not affect the absorption of sunlight, ensures the photoelectric conversion efficiency of the solar cell. BRIEF DESCRIPTION OF DRAWINGS

[0024] In the drawings, like reference numerals refer to like elements throughout the various drawings. The drawings are not necessarily to scale, the emphasis instead being placed on illustrating the principles of the application. It should be understood that the drawings are merely depictions of some embodiments of the application and should not be construed as limiting the scope of the application.

[0025] Figure 1 A structural schematic diagram of a solar cell provided by an embodiment of the present application is shown.

[0026] Figure 2 A structural schematic diagram of a solar cell provided by another embodiment of the present application is shown. Figure 1 A structural schematic diagram of a first grid line in the solar cell is shown.

[0027] Figure 3 A structural schematic diagram of a solar cell provided by another embodiment of the present application is shown.

[0028] Figure 4 A structural schematic diagram of a solar cell provided by another embodiment of the present application is shown.

[0029] Figure 5 A structural schematic diagram of a solar cell provided by another embodiment of the present application is shown. Figure 4 A structural schematic diagram of a first grid line in the solar cell is shown.

[0030] Figure 6 A structural schematic diagram of an auxiliary grid in a solar cell provided by another embodiment of the present application is shown.

[0031] Figure 7 A structural schematic diagram of a solar cell corresponding to the auxiliary grid structure of is shown. Figure 6 A structural schematic diagram of a solar cell corresponding to the auxiliary grid structure of is shown.

[0032] Figure 8 A structural schematic diagram of an auxiliary grid in a solar cell provided by another embodiment of the present application is shown.

[0033] Figure 9 A structural schematic diagram of a solar cell corresponding to the auxiliary grid structure of is shown. Figure 8 A structural schematic diagram of a solar cell corresponding to the auxiliary grid structure of is shown. DETAILED DESCRIPTION

[0034] In order to make the purposes, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0035] It should be noted that the terms "first", "second", and the like in the description of the present application and the claims and the above-described accompanying drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the terms thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to the process, method, product, or device.

[0036] In the present application, when a numerical interval (i.e., a numerical range) is involved, the distribution of the optional values in the numerical interval is considered to be continuous and includes both numerical endpoints (i.e., the minimum value and the maximum value) of the numerical interval and every value between the two numerical endpoints, unless otherwise specified. When a numerical interval refers only to integers in the numerical interval, unless otherwise specified, the two endpoint integers of the numerical range and every integer between the two endpoints are equivalent to directly listing each integer. When multiple numerical ranges are provided to describe a feature or a characteristic, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed in the present application should be understood to include any and all sub-ranges included therein. The "numerical" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. The "numerical interval" is intended to broadly include quantitative intervals such as percentage intervals, ratio intervals, and value intervals.

[0037] Hereinafter, exemplary embodiments according to the present application will be described in greater detail with reference to the accompanying drawings. It should be understood that the exemplary embodiments can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein.

[0038] As Figures 1 to 9As shown, the embodiment of the present application provides a solar cell, which comprises a cell sheet 100 and an electrode grid line structure arranged on the surface of the cell sheet 100; the cell grid line is used to conduct the current inside the cell sheet 100 outwards for the power supply of external power equipment. A reasonable electrode grid line structure needs to take into account the rapid and more efficient conduction of current, and in addition, it also needs to have sufficient support to avoid the grid line from falling off. The electrode grid line structure comprises a sub-grid 200 and a main grid 300. The electrode grid line structure can be arranged on the front surface and / or the back surface of the cell sheet 100.

[0039] The sub-grid 200 comprises a plurality of first grid lines 210 arranged in sequence along a first direction, wherein the first grid line 210 comprises a plurality of grid line segments, and part of the grid line segments serve as support lines 220, or a plurality of support lines 220 are connected between adjacent first grid lines 210.

[0040] The plurality of first grid lines 210 can be first grid lines 210 extending in the same direction, for example, the plurality of first grid lines 210 can be arranged in sequence along the longitudinal direction of the cell sheet 100, and the plurality of first grid lines 210 all extend along the transverse direction.

[0041] The direction of the support line 220 is different from the extension direction of the first grid line 210, and the support line 220 connects adjacent first grid lines 210, so that the plurality of first grid lines 210 have a support effect, which can improve the firmness of the sub-grid 200 and avoid the grid line from falling off.

[0042] The main grid 300 is stacked on the support line 220. The main grid 300 is used to concentrate the current collected by the sub-grid 200 and conduct it to the positive and negative lead wires to supply power to external power equipment.

[0043] The embodiment of the present application comprises the support line 220 in the sub-grid 200, so that the sub-grid 200 itself has a support effect, improves the firmness of the sub-grid 200, and avoids the grid line from falling off; at the same time, the main grid 300 is stacked on the support line 220, which does not increase the redundant shielding area, so that the grid line structure has a firm structure and is not easy to fall off, and at the same time, it does not affect the absorption of sunlight, ensuring the photoelectric conversion efficiency of the solar cell.

[0044] In one embodiment, as shown in Figures 1 to 3 The first grid line 210 comprises a plurality of first inflection points 201 and a plurality of second inflection points 202, and the first inflection points 201 and the second inflection points 202 are arranged alternately; the first inflection points 201 and the second inflection points 202 are located on opposite sides of the center line of the first grid line 210.

[0045] In one example, the first gate line 210 can be a "Z" type wave structure, which includes a plurality of first inflection points 201 and a plurality of second inflection points 202. The first inflection point 201 can be an upward inflection point, such as a wave peak; correspondingly, the second inflection point 202 can be a downward inflection point, such as a wave valley.

[0046] In one example, the first gate line 210 can also be a structure similar to a "Z" type wave structure, such as a structure with a circular arc transition at the wave peak or wave valley, which can facilitate processing and improve the firmness of the inflection points of the first gate line 210.

[0047] In one example, the first gate line 210 can be a "Z" type wave structure, which includes a plurality of first inflection points 201 and a plurality of second inflection points 202. The first inflection point 201 can be an upward inflection point, such as a wave peak; correspondingly, the second inflection point 202 can be a downward inflection point, such as a wave valley.

[0048] In the above example, the first gate line 210 is a "Z" type wave structure, and the first inflection point 201 of the current first gate line 210 coincides with the second inflection point 202 of the adjacent first gate line 210, so that a cross point is formed between the adjacent first gate lines 210, and the connection of the cross point can improve the support performance between the adjacent first gate lines 210, thereby improving the firmness of the auxiliary gate 200 and preventing the auxiliary gate 200 from falling off locally.

[0049] Further, by making the first gate line segment 2101 of the adjacent first gate line 210 collinear with the current first gate line 210, the plurality of first gate line segments 2101 are connected in a straight line segment in the overall structure of the auxiliary gate 200, which has stronger support performance and can further improve the firmness of the auxiliary gate 200.

[0050] In one embodiment, the positions of the plurality of first inflection points 201 in the first gate line 210 are kept flush, and the positions of the plurality of second inflection points 202 are kept flush.

[0051] It can be understood that the positions of the plurality of first inflection points 201 in the first gate line 210 are not flush, or the positions of the plurality of second inflection points 202 are not flush, which are also within the protection scope of the embodiments of the present application. The schematic structural diagram of the electrode gate line is shown in Figure 3

[0052] ​In the embodiments of the present application, the first inflection point 201 and the second inflection point 202 are arranged in a flat manner respectively, so that the structure of the first grid line 210 is more regular, facilitating regular and uniform transmission of current, avoiding excessive current conduction at a local grid line position, resulting in current loss; or avoiding insufficient current at a local grid line position, resulting in waste of space of the grid line; based on this, the power generation efficiency of the solar cell can be improved.

[0053] In an embodiment, the first grid line 210 includes a second grid line segment 2102 extending from the first inflection point 201 to the second inflection point 202; and the angle between the second grid line segment 2102 and the first grid line segment 2101 is 30°-75°.

[0054] The second grid line segment 2102 and the first grid line segment 2101 form an angle, thereby forming a wave shape structure with a plurality of first inflection points 201 and a plurality of second inflection points 202.

[0055] If the angle between the second grid line segment 2102 and the first grid line segment 2101 is too small, the first grid line segment 2101 and the second grid line segment 2102 will be too much, the grid line structure will be too dense, and the current transmission time will be increased; if the angle between the second grid line segment 2102 and the first grid line segment 2101 is too large, the number of the first grid line 210 will be too much, which also leads to the grid line structure being too dense and increasing the cost of preparing the first grid line 210.

[0056] Based on this, in the first grid line 210 provided in the embodiments of the present application, the angle between the second grid line segment 2102 and the first grid line segment 2101 is 30°-75°; for example, it can be 30°, 40°, 55°, 60°, 68°, and 75°, etc.

[0057] In an embodiment, the plurality of second grid line segments 2102 are arranged in parallel, and the distance between adjacent second grid line segments 2102 is 1 / 20-1 / 10 of the size of the cell piece 100 along the center line direction of the first grid line 210.

[0058] In one example, the first grid line 210 extends along the transverse direction of the cell piece 100, the size of the center line direction of the first grid line 210 is the width of the cell piece 100, and the distance between adjacent second grid line segments 2102 is 1 / 20-1 / 10 of the size of the cell piece 100 along the center line direction of the first grid line 210, that is, the number or distance of the second grid line segment 2102 is determined according to the width of the cell piece 100, so that the first grid line 210 has a suitable length to meet the current transmission needs.

[0059] In some other examples, the length of the second grid line segment 2102 in the first grid line 210 and the number of the second grid line segments 2102 can also be determined according to the power generation of the battery sheet 100. The number of the second grid line segments 2102 is determined, i.e. the spacing between adjacent second grid line segments 2102 is determined. The length of the second grid line segment 2102 is determined, i.e. the included angle between the second grid line segment 2102 and the first grid line segment 2101 is determined.

[0060] In an embodiment, as shown in FIG. 2A, the first grid line 210 includes a plurality of third turning points 203 and a plurality of fourth turning points 204, and the third turning points 203 and the fourth turning points 204 are arranged alternately; the third turning points 203 and the fourth turning points 204 are located on opposite sides of the center line of the first grid line 210. Similarly, the first grid line 210 structure including a plurality of third turning points 203 and a plurality of fourth turning points 204 in this way can also be a "Z" shaped wave structure, and the turning points can also be circular arc transitions. Figure 4 Figure 5 As shown in FIG. 2A, the first grid line 210 includes a plurality of third turning points 203 and a plurality of fourth turning points 204, and the third turning points 203 and the fourth turning points 204 are arranged alternately; the third turning points 203 and the fourth turning points 204 are located on opposite sides of the center line of the first grid line 210. Similarly, the first grid line 210 structure including a plurality of third turning points 203 and a plurality of fourth turning points 204 in this way can also be a "Z" shaped wave structure, and the turning points can also be circular arc transitions.

[0061] The two ends of the support line 220 are connected to the third turning point 203 of the current first grid line 210 and the fourth turning point 204 adjacent to the first grid line 210, respectively; the first grid line 210 adjacent to the current first grid line 210 is a first grid line 210 adjacent to the current first grid line 210; the support line 220 of the current first grid line 210 and the first grid line 210 adjacent to the current first grid line 210 are collinear.

[0062] Unlike the above-mentioned embodiments, in the embodiments of the present application, there is no intersection point between adjacent first grid lines 210, but the adjacent first grid lines 210 are connected by additional support lines 220 to support the first grid lines 210.

[0063] In one example, the sub-grid 200 structure of this embodiment can be a hexagonal net structure, and the hexagons in the hexagonal net structure can be regular hexagons or ordinary hexagons.

[0064] In an embodiment, the positions of the plurality of third turning points 203 in the first grid line 210 are kept flush, and the positions of the plurality of fourth turning points 204 are kept flush.

[0065] It can be understood that the positions of the plurality of third turning points 203 in the first grid line 210 are not flush, or the positions of the plurality of fourth turning points 204 are not flush, which are also within the protection scope of the embodiments of the present application.

[0066] ​In the embodiment of the present application, the third inflection point 203 and the fourth inflection point 204 are arranged in a flat manner respectively, so that the structure of the first grid line 210 is more regular, facilitating regular and uniform transmission of the current, avoiding excessive current conduction at the local grid line position, resulting in current loss; or avoiding insufficient current at the local grid line position, resulting in waste of space of the grid line; based on this, the power generation efficiency of the solar cell can be improved.

[0067] In an embodiment, the included angle at the third inflection point 203 or the fourth inflection point 204 in the first grid line 210 is 90°-180°.

[0068] The first grid line 210 includes a plurality of third inflection points 203 and a plurality of fourth inflection points 204, so that the first grid line 210 is in a wave shape. In the wave shape, the included angle at the third inflection point 203 or the fourth inflection point 204 is 90°-180°, i.e. an obtuse angle, so that it is necessary to have an increase in the support line 220 in the adjacent first grid line 210, in addition, in the case that the included angle at the third inflection point 203 or the fourth inflection point 204 is an obtuse angle, the length of the current transmission along the extension direction of the first grid line 210 can be reduced, so that the current can be more quickly converged, and the power generation speed of the solar cell can be improved.

[0069] In the first grid line 210 provided by the embodiment of the present application, the included angle at the third inflection point 203 or the fourth inflection point 204 is 90°-180°, for example, it can be 90°, 100°, 145°, 160°, 175° and 180°, etc.

[0070] In an embodiment, the plurality of support lines 220 are arranged in parallel, and the spacing between adjacent support lines 220 is 1 / 29-1 / 12 of the size of the cell sheet 100 along the center line direction of the first grid line 210.

[0071] In one example, the first grid line 210 extends along the transverse direction of the cell sheet 100, the size of the center line direction of the first grid line 210 is the width of the cell sheet 100, and the spacing between adjacent support lines 220 is 1 / 29-1 / 12 of the size of the cell sheet 100 along the center line direction of the first grid line 210, i.e. the number or spacing of the support lines 220 is determined according to the width of the cell sheet 100, so that the first grid line 210 has a suitable length to meet the needs of current transmission.

[0072] In some other examples, the length of the support line 220 in the first grid line 210 and the number of the support line 220 can also be determined according to the power generation power of the cell sheet 100. The number of the support line 220 is determined, i.e. the spacing between adjacent support lines 220 is determined. The length of the support line 220 is determined, i.e. the included angle between the support line 220 and the first grid line segment 2101 is determined.

[0073] In one embodiment, as shown in FIG. 2, the first grid lines 210 are straight lines; the angle between the support lines 220 and the first grid lines 210 is 85-95°; the interval between adjacent first grid lines 210 is 1 / 20-1 / 10 of the size of the solar cell 100 along the direction of the support lines 220. Figures 6 to 9

[0074] The angle between the support lines 220 and the first grid lines 210 is 85-95°, which can be understood as that the support lines 220 are perpendicular or approximately perpendicular to the first grid lines 210. The perpendicularity between the support lines 220 and the first grid lines 210 makes the sub-grid 200 a net-like structure composed of multiple rectangles, which is simple in structure and convenient for processing, and meanwhile, the structure of the sub-grid 200 itself has a supporting effect on itself, improving the firmness of the sub-grid 200.

[0075] In one example, as shown in FIG. 2, the support lines 220 in the sub-grid 200 are used to support the first grid lines 210, so that the sub-grid 200 itself has a supporting force. Therefore, the support lines 220 can be arranged between the first grid lines 210 without extending to the edge of the solar cell 100, which can save the silver paste material for preparing the sub-grid 200. Correspondingly, the main grid 300 is stacked on the support lines 220 and can extend to the edge of the solar cell 100 to conduct current to the outside of the solar cell 100. Figure 6 In one embodiment, as shown in FIG. 2, the support lines 220 on both sides of the first grid lines 210 are arranged alternately.

[0076] Figure 8

[0077] The alternate arrangement of the support lines 220 on both sides of the first grid lines 210 makes it possible to have the same supporting effect with fewer support lines 220, so that a sub-grid 200 structure with firm performance is provided with fewer grid lines.

[0078] In the above various embodiments, the number of the main grid 300 is less than or equal to the number of the support lines 220 on one side of the first grid lines 210.

[0079] The number of the main grid 300 is determined according to factors such as the surface area of the solar cell 100, the collection efficiency, and the production cost. The number of the support lines 220 along the width direction can be determined according to the number of the main grid 300, i.e., the number of the support lines 220 is determined according to the number of the main grid 300; and then the structure of the sub-grid 200 is determined based on the number of the support lines 220. Alternatively, the number of the support lines 220 can be set to be twice or a multiple of the number of the main grid 300 after the number of the main grid 300 is determined, which is specifically determined according to factors such as the light-shielding factor, the power factor of the solar cell 100, or the power on the first grid lines 210.

[0080] ​​​The embodiments of the present application can also provide a photovoltaic module (not shown), which comprises a plurality of solar cells connected in series and / or in parallel; wherein at least one of the solar cells is the solar cell as described above, and in particular, the solar cell comprises the electrode grid line structure as described in the above embodiments. The plurality of solar cells in series form a cell string, and adjacent solar cells can be connected together by string welding.

[0081] The embodiments of the present application can provide a photovoltaic system comprising the photovoltaic module in any of the above embodiments. The photovoltaic system has the advantages of the photovoltaic module, which will not be repeated here. The photovoltaic system has a wide range of applications, and is not limited to photovoltaic power stations, such as ground power stations, roof power stations, and water surface power stations, but also includes various devices and apparatuses that utilize solar power, such as user solar power sources, solar street lamps, solar cars, and solar buildings. Of course, it can be understood that the application scenarios of the photovoltaic system are not limited to this, that is, the photovoltaic system can be applied in all fields that need to use solar power to generate electricity. 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 a plurality of photovoltaic modules, for example, a plurality of photovoltaic modules can form a plurality of photovoltaic arrays, the photovoltaic arrays are connected to the combiner box, the combiner box can combine the currents generated by the photovoltaic arrays, the combined currents flow through the inverter to convert into alternating current required by the power grid, and then are connected to the power network to realize solar power supply.

[0082] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component, and / or combination thereof.

[0083] For the convenience of description, the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal", and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself. For example, if the device in the drawing is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0084] Unless specifically stated and limited otherwise, the terms "mount", "connect", "connection", "fixed", and the like, should be broadly interpreted, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection, or communication; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0085] Unless specifically stated and limited otherwise, "on" or "under" the first feature of the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0086] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0087] It should also be noted that the terms "one embodiment," "another embodiment," or "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0088] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0089] It should also be noted that the above are merely preferred embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A solar cell, characterized by, The solar cell includes a cell sheet and an electrode grid structure arranged on a surface of the cell sheet; the electrode grid structure includes: a sub-grid including a plurality of first grid lines arranged in sequence along a first direction; wherein the first grid line includes a plurality of grid line segments, and part of the grid line segments serves as a support line, or a plurality of support lines are connected between adjacent first grid lines; a main grid stacked on the support line.

2. The solar cell according to claim 1, characterized in that, The first grid line includes a plurality of first inflection points and a plurality of second inflection points, and the first inflection points and the second inflection points are arranged alternately; the first inflection points and the second inflection points are located on opposite sides of a center line of the first grid line; The first inflection point of a current first grid line coincides with the second inflection point of an adjacent first grid line; the adjacent first grid line is a first grid line adjacent to the current first grid line; the support line is a first grid line segment of the first grid line extending from the second inflection point to the first inflection point, and the adjacent first grid line is collinear with the first grid line segment of the current first grid line.

3. The solar cell according to claim 2, characterized in that, The positions of a plurality of the first inflection points in the first grid line are kept flush, and the positions of a plurality of the second inflection points are kept flush.

4. The solar cell according to claim 3, characterized in that, The first grid line includes a second grid line segment extending from the first inflection point to the second inflection point; the included angle between the second grid line segment and the first grid line segment is 30°-75°.

5. The solar cell according to claim 4, characterized in that, A plurality of the second grid line segments are arranged in parallel, and the spacing between adjacent second grid line segments is 1 / 20-1 / 10 of the size of the cell sheet along the center line direction of the first grid line.

6. The solar cell of claim 1, wherein The first grid line includes a plurality of third inflection points and a plurality of fourth inflection points, and the third inflection points and the fourth inflection points are arranged alternately; the third inflection points and the fourth inflection points are located on opposite sides of a center line of the first grid line; The two ends of the support line are respectively connected to the third inflection point of a current first grid line and the fourth inflection point of an adjacent first grid line; the adjacent first grid line is a first grid line adjacent to the current first grid line; the adjacent first grid line is collinear with the support line of the current first grid line.

7. The solar cell according to claim 6, characterized in that The positions of a plurality of the third inflection points in the first grid line are kept flush, and the positions of a plurality of the fourth inflection points are kept flush.

8. The solar cell of claim 6, wherein, In the first grid line, the included angle at the third inflection point or the fourth inflection point is 90°-180°.

9. The solar cell of claim 6, wherein, A plurality of the support lines are arranged in parallel, and the spacing between adjacent support lines is 1 / 29-1 / 12 of the size of the cell sheet along the center line direction of the first grid line.

10. The solar cell of claim 1, wherein, The first grid line is a straight line; the support line is arranged at an included angle of 85°-95° with the first grid line; the spacing between adjacent first grid lines is 1 / 20-1 / 10 of the size of the cell sheet along the direction of the support line.

11. The solar cell of claim 10, wherein, The support lines on both sides of the first grid line are staggered.

12. The solar cell according to any one of claims 1 to 11, characterized in that, The number of the main grid is less than or equal to the number of the support lines on one side of the first grid line.

13. A photovoltaic module, characterized by The solar cell includes a cell sheet and an electrode grid structure arranged on a surface of the cell sheet; the electrode grid structure includes:

14. A photovoltaic system characterized by, a sub-grid including a plurality of first grid lines arranged in sequence along a first direction; wherein the first grid line includes a plurality of grid line segments, and part of the grid line segments serves as a support line, or a plurality of support lines are connected between adjacent first grid lines; a main grid stacked on the support line. The first grid line includes a plurality of first inflection points and a plurality of second inflection points, and the first inflection points and the second inflection points are arranged alternately; the first inflection points and the second inflection points are located on opposite sides of a center line of the first grid line; The first inflection point of a current first grid line coincides with the second inflection point of an adjacent first grid line; the adjacent first grid line is a first grid line adjacent to the current first grid line; the support line is a first grid line segment of the first grid line extending from the second inflection point to the first inflection point, and the adjacent first grid line is collinear with the first grid line segment of the current first grid line. The positions of a plurality of the first inflection points in the first grid line are kept flush, and the positions of a plurality of the second inflection points are kept flush. The first grid line includes a second grid line segment extending from the first inflection point to the second inflection point; the included angle between the second grid line segment and the first grid line segment is 30°-75°. A plurality of the second grid line segments are arranged in parallel, and the spacing between adjacent second grid line segments is 1 / 20-1 / 10 of the size of the cell sheet along the center line direction of the first grid line. The first grid line includes a plurality of third inflection points and a plurality of fourth inflection points, and the third inflection points and the fourth inflection points are arranged alternately; the third inflection points and the fourth inflection points are located on opposite sides of a center line of the first grid line; The two ends of the support line are respectively connected to the third inflection point of a current first grid line and the fourth inflection point of an adjacent first grid line; the adjacent first grid line is a first grid line adjacent to the current first grid line; the adjacent first grid line is collinear with the support line of the current first grid line. The positions of a plurality of the third inflection points in the first grid line are kept flush, and the positions of a plurality of the fourth inflection points are kept flush. In the first grid line, the included angle at the third inflection point or the fourth inflection point is 90°-180°. A plurality of the support lines are arranged in parallel, and the spacing between adjacent support lines is 1 / 29-1 / 12 of the size of the cell sheet along the center line direction of the first grid line. The first grid line is a straight line; the support line is arranged at an included angle of 85°-95° with the first grid line; the spacing between adjacent first grid lines is 1 / 20-1 / 10 of the size of the cell sheet along the direction of the support line. The support lines on both sides of the first grid line are staggered. The number of the main grid is less than or equal to the number of the support lines on one side of the first grid line. The solar cell includes a cell sheet and an electrode grid structure arranged on a surface of the cell sheet; the electrode grid structure includes: a sub-grid including a plurality of first grid lines arranged in sequence along a first direction; wherein the first grid line includes a plurality of grid line segments, and part of the grid line segments serves as a support line, or a plurality of support lines are connected between adjacent first grid lines; a main grid stacked on the support line. The first grid line includes a plurality of first inflection points and a plurality of second inflection points, and the first inflection points and the second inflection points are arranged alternately; the first inflection points and the second inflection points are located on opposite sides of a center line of the first grid line; The first inflection point of a current first grid line coincides with the second inflection point of an adjacent first grid line; the adjacent first grid line is a first grid line adjacent to the current first grid line; the support line is a first grid line segment of the first grid line extending from the second inflection point to the first inflection point, and the adjacent first grid line is collinear with the first grid line segment of the current first grid line. The positions of a plurality of the first inflection points in the first grid line are kept flush, and the positions of a plurality of the second inflection points are kept flush. The first grid line includes a second grid line segment extending from the first inflection point to the second inflection point; the included angle between the second grid line segment and the first grid line segment is 30°-75°. A plurality of the second grid line segments are arranged in parallel, and the spacing between adjacent second grid line segments is 1 / 20-1 / 10 of the size of the cell sheet along the center line direction of the first grid line. The first grid line includes a plurality of third inflection points and a plurality of fourth inflection points, and the third inflection points and the fourth inflection points are arranged alternately; the third inflection points and the fourth inflection points are located on opposite sides of a center line of the first grid line; The two ends of the support line are respectively connected to the third inflection point of a current first grid line and the fourth inflection point of an adjacent first grid line; the adjacent first grid line is a first grid line adjacent to the current first grid line; the adjacent first grid line is collinear with the support line of the current first grid line. The positions of a plurality of the third inflection points in the first grid line are kept flush, and the positions of a plurality of the fourth inflection points are kept flush. In the first grid line, the included angle at the third inflection point or the fourth inflection point is 90

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