Electrode structure of solar cell, solar cell and solar cell module

Abstract

The utility model is applicable to the field of photovoltaic technology, and provides an electrode structure of a solar cell, the solar cell and a solar cell module, the electrode structure comprises a plurality of first fine grids, a plurality of second fine grids, a first conductive contact structure, a second conductive contact structure and a third conductive contact structure, the first conductive contact structure comprises a first conductive base point and a first conductive outgoing line, and the second conductive contact structure comprises a second conductive base point and a second conductive outgoing line. According to the invention, the first conductive base point is electrically contacted with a part of the first fine grid, the first conductive lead-out wire is electrically contacted with the other part of the first fine grid, the second conductive base point is electrically contacted with a part of the second fine grid, and the second conductive lead-out wire is electrically contacted with the other part of the second fine grid. The first conductive base point and the second conductive base point can be used for being in contact with a positive probe and a negative probe of test equipment respectively, so that the solar cell can be detected, and the reliability of a detection result is greatly improved.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic technology, and particularly relates to an electrode structure of a solar cell, a solar cell, and a solar cell module. Background Art

[0002] In a back-contact solar cell, in order to reduce the use of paste, the back-contact solar cell adopts a design without main grids. However, in such a technical solution, due to the design without main grids on the back, it is greatly difficult to perform performance tests such as hot spot, EL, leakage current, and parallel resistance R on the back-contact solar cell. There is no stable contact between the back-contact solar cell and the test probe, the test is difficult, and the reliability and stability are poor. sh The difficulty of performing performance tests such as hot spot, EL, leakage current, and parallel resistance R on the back-contact solar cell is greatly increased. There is no stable contact between the back-contact solar cell and the test probe, the test is difficult, and the reliability and stability are poor. Summary of the Utility Model

[0003] This application provides a solar cell, aiming to solve the problems of large detection limitations and unreliable detection results of solar cells.

[0004] This application is implemented as follows. An electrode structure of a solar cell includes a plurality of first fine grids and a plurality of second fine grids. The plurality of first fine grids and the plurality of second fine grids extend along a first direction and are alternately distributed at intervals along a second direction. The first direction intersects the second direction, and the first fine grid and the second fine grid have different polarities; a first conductive contact structure, the first conductive contact structure includes a first conductive base point and a first conductive lead-out wire. One end of the first conductive lead-out wire is connected to the first conductive base point, and the other end of the first conductive lead-out wire extends along the second direction. The first conductive base point is in electrical contact with a part of the first fine grids, and the first conductive lead-out wire is in electrical contact with another part of the first fine grids; a second conductive contact structure, the second conductive contact structure includes a second conductive base point and a second conductive lead-out wire. One end of the second conductive lead-out wire is connected to the second conductive base point, and the other end of the second conductive lead-out wire extends along the second direction. The second conductive base point is in electrical contact with a part of the second fine grids, and the second conductive lead-out wire is in electrical contact with another part of the second fine grids.

[0005] Optionally, the first conductive contact structure is in electrical contact with all of the first fine grids, and the second conductive contact structure is in electrical contact with all of the second fine grids.

[0006] Optionally, the first conductive lead-out wire is insulated from the second fine grids, and the second conductive lead-out wire is insulated from the first fine grids.

[0007] Optionally, the ratio percentage of the number of the first fine grids electrically connected by the first conductive lead-out wire to the total number of all the first fine grids is greater than or equal to 50%.

[0008] Optionally, the percentage ratio of the number of the second fine grids electrically connected to the second conductive lead-out wire to the total number of all the second fine grids is greater than or equal to 50%.

[0009] Optionally, the center lines of the first conductive base point and the second conductive base point are collinearly arranged in the first direction.

[0010] Optionally, the number of the first fine grids connected to the first conductive base point is different from the number of the second fine grids connected to the second conductive base point.

[0011] Optionally, the number of the first fine grids connected to the first conductive base point is the same as the number of the second fine grids connected to the second conductive base point.

[0012] Optionally, the width of the first conductive lead-out wire is greater than the width of the first fine grid, and the width of the second conductive lead-out wire is greater than the width of the second fine grid.

[0013] Optionally, the first conductive base point and the second conductive base point are arranged on the same plane. The projected area of the first conductive base point on the plane is the first area, and the projected area of the second conductive base point on the plane is the second area. The first area is equal to the second area.

[0014] Optionally, a plurality of first fine grids are equidistantly arranged at a first preset distance along the second direction, and a plurality of the second fine grids are equidistantly arranged at a second preset distance along the second direction.

[0015] Optionally, the range of the first preset distance is 60 - 80 μm.

[0016] Optionally, the range of the second preset distance is 60 - 80 μm.

[0017] In this application, by arranging the first conductive base point in electrical contact with a part of the first fine grids, the first conductive lead-out wire in electrical contact with another part of the first fine grids, the second conductive base point in electrical contact with a part of the second fine grids, and the second conductive lead-out wire in electrical contact with another part of the second fine grids, when performing tests such as hot spot and EL on a solar cell, the first conductive base point and the second conductive base point can be used to respectively contact the positive and negative probes of the test equipment. In this way, the detection of the solar cell can be realized, and the reliability of the detection result is greatly improved.

[0018] A solar cell includes the electrode structure of the above-mentioned solar cell.

[0019] A solar cell module, wherein the solar cell module includes the above-mentioned solar cell. Description of the Drawings

[0020] Figure 1 is a schematic diagram of the electrode structure of the solar cell provided by the present application Figure 1 ;

[0021] Figure 2 is a schematic diagram of the electrode structure of the solar cell provided by the present application Figure 2 ;

[0022] Figure 3 is a schematic diagram of the electrode structure of the solar cell provided by the present application Figure 3 ;

[0023] Figure 4 is a schematic diagram of the electrode structure of the solar cell provided by the present application Figure 4

[0024] Figure 5 is a schematic diagram of the electrode structure of the solar cell provided by the present application Figure 5 。

[0025] Explanation of reference numerals:

[0026] 10, first fine grid; 20, second fine grid; 30, first conductive base point; 40, second conductive base point; 50, first conductive lead-out wire; 60, second conductive lead-out wire; 70, first conductive contact structure; 80, second conductive contact structure. Detailed implementation manners

[0027] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application. In addition, it should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0030] In the description of this application, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection, an electrical connection or a connection that allows mutual communication; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0032] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure of this application, components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit this application. In addition, this application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0033] As Figure 1 shown, an electrode structure of a solar cell includes a plurality of first fine grids 10, a plurality of second fine grids 20, a first conductive contact structure 70 and a second conductive contact structure 80.

[0034] In the embodiments of the present application, a plurality of first fine grids 10 and a plurality of second fine grids 20 extend along a first direction and are alternately distributed at intervals along a second direction. The first direction intersects the second direction, and the first fine grids 10 and the second fine grids 20 have different polarities. The first conductive contact structure 70 includes a first conductive base point 30 and a first conductive lead-out wire 50. One end of the first conductive lead-out wire 50 is connected to the first conductive base point 30, and the other end of the first conductive lead-out wire 50 extends along the second direction. The first conductive base point 30 is in electrical contact with some of the first fine grids 10, and the first conductive lead-out wire 50 is in electrical contact with some other of the first fine grids 10. The second conductive contact structure 80 includes a second conductive base point 40 and a second conductive lead-out wire 60. One end of the second conductive lead-out wire 60 is connected to the second conductive base point 40, and the other end of the second conductive lead-out wire 60 extends along the second direction. The second conductive base point 40 is in electrical contact with some of the second fine grids 20, and the second conductive lead-out wire 60 is in electrical contact with some other of the second fine grids 20.

[0035] In the present application, by providing that the first conductive base point 30 is in electrical contact with some of the first fine grids 10, the first conductive lead-out wire 50 is in electrical contact with some other of the first fine grids 10, the second conductive base point 40 is in electrical contact with some of the second fine grids 20, and the second conductive lead-out wire 60 is in electrical contact with some other of the second fine grids 20, when performing tests such as hot spot, EL, leakage current, and parallel resistance R on the solar cell sh and so on, the first conductive base point 30 and the second conductive base point 40 can be used to contact the positive and negative probes of the test equipment respectively. In this way, the detection of the solar cell can be realized, and the reliability of the detection result is greatly improved.

[0036] In some embodiments, a part of the first fine grid 10 and another part of the first fine grid 10 constitute the entire first fine grid 10, and a part of the second fine grid 20 and another part of the second fine grid 20 constitute the entire second fine grid 20. That is to say, the first conductive contact structure 70 is in electrical contact with the entire first fine grid 10, and the second conductive contact structure 80 is in electrical contact with the entire second fine grid 20. Thus, by providing one first conductive contact structure 70 and one second conductive contact structure 80, the detection of the entire solar cell can be completed, and the detection result is more reliable. It should be noted that, in some embodiments, a part of the first fine grid 10 can be 0 first fine grids 10, and another part of the first fine grid 10 is the entire first fine grid 10. That is to say, the first conductive base point 30 is not in electrical contact with any one of the multiple first fine grids 10, and the first conductive lead-out wire 50 is in electrical contact with the entire first fine grid 10. In this way, the first conductive base point 30 can be set to a smaller size, reducing the use of paste. Similarly, in some embodiments, a part of the second fine grid 20 can be 0 second fine grids 20, and another part of the second fine grid 20 is the entire second fine grid 20. That is to say, the second conductive base point 40 is not in electrical contact with any one of the multiple second fine grids 20, and the second conductive lead-out wire 60 is in electrical contact with the entire second fine grid 20. In this way, the second conductive base point 40 can be set to a smaller size, reducing the use of paste.

[0037] In some embodiments, multiple first fine grids 10 and multiple second fine grids 20 are disposed on the surface of the cell. The multiple first fine grids 10 and the multiple second fine grids 20 both extend along a first direction, and the multiple first fine grids 10 and the multiple second fine grids 20 are arranged at intervals along a second direction. That is to say, one second fine grid 20 line is disposed on each side of each first fine grid 10 line, and the multiple first fine grids 10 lines and the multiple second fine grids 20 are used to collect the current generated by the cell.

[0038] In the embodiments of the present application, the second direction intersects the first direction. Specifically, the second direction can be perpendicular to the first direction. Exemplarily, the first direction can be the length direction of the cell, and the second direction can be the width direction of the cell.

[0039] In some embodiments, the first fine grid 10 and the second fine grid 20 can be formed by screen printing. The metal paste is printed onto the surface of the cell to form fine grid lines on the surface of the cell. Among them, the metal paste can be silver paste, aluminum paste, etc. Here, the specific material of the metal paste is not limited. In actual use, those skilled in the art can select a suitable material according to requirements.

[0040] Preferably, along the first direction, the length of the first fine grid 10 line is adapted to the length of the cell. It can also be understood that, along the first direction, the length of the first fine grid 10 line is equal to the length of the cell.

[0041] Preferably, along the first direction, the length of the second fine grid 20 lines is adapted to the length of the cell. It can also be understood that along the first direction, the length of the second fine grid 20 lines is equal to the length of the cell.

[0042] In some embodiments, the first conductive base point 30 and the second conductive base point 40 can be sprayed with silver paste; generally, the following steps are included: cleaning the surface of the back of the cell to ensure it is clean and dust-free; coating a layer of silver paste at the positions of the first conductive base point 30 and the second conductive base point 40; evenly adsorbing the silver paste on the surface of the back of the cell by means of vacuum evaporation plating or the like; fixing the cell in a battery panel or a battery module to complete the entire process. By this process, the conductivity of the cell and the ability to prevent short circuits can be improved, thereby improving the safety and service life of the battery.

[0043] As Figure 4 and Figure 5 shown, in the embodiments of the present application, the number of the first conductive base points 30 and the second conductive base points 40 can be 2, 3, 4, 5, etc. respectively. The first conductive base points 30 and the second conductive base points 40 are arranged in pairs, and the present application does not limit this. Preferably, one first conductive base point 30 and one second conductive base point 40 are respectively arranged, and the first conductive base point 30 and the second conductive base point 40 are arranged at intervals. The interval distance between the first conductive base point 30 and the second conductive base point 40 is at least 5 / 6 of the length of the solar cell. Setting a larger interval distance between the first conductive base point 30 and the second conductive base point 40 can enable the detection current to have a larger lateral transmission distance, thereby completing the performance detection of the entire solar cell. Specifically, the first conductive base point 30 and the second conductive base point 40 cooperate with the positive and negative probe needles of the detection device to make contact conduction, apply a reverse voltage, and then detect various electrical properties of the cell.

[0044] Understandably, the first conductive lead-out wire 50 and the second fine grid 20 are insulated from each other, and the second conductive lead-out wire 60 and the first fine grid 10 are insulated from each other. The first conductive base point 30 is in electrical contact with the first fine grid 10 while being insulated from the second fine grid 20, and the second conductive base point 40 is in electrical contact with the second fine grid 20 while being insulated from the first fine grid 10. Specifically, the form of the insulation between the first conductive base point 30 and the second fine grid 20 can be that the second fine grid 20 forms a discontinuous structure at the first conductive base point 30, and the second fine grid 20 is physically isolated from and does not contact the first conductive base point 30, or an insulating adhesive is provided between the first conductive base point 30 and the second fine grid 20; the form of the insulation between the second conductive base point 40 and the first fine grid 10 can be that the first fine grid 10 forms a discontinuous structure at the second conductive base point 40, and the first fine grid 10 is physically isolated from and does not contact the second conductive base point 40, or an insulating adhesive is provided between the second conductive base point 40 and the first fine grid 10, thus avoiding short circuits in the solar cell.

[0045] In some embodiments, the percentage ratio of the number of the first fine grids 10 electrically connected to the first conductive lead-out wire 50 to the total number of all the first fine grids 10 is greater than or equal to 50%. Since the second fine grid 20 and the first conductive lead-out wire 50 are insulated from each other, the second fine grid has a poor effect on collecting carriers in the insulated area. By setting the ratio of the number of the first fine grids 10 electrically connected to the first conductive lead-out wire 50 to the total number of all the first fine grids 10 to 50%, on the one hand, the reliability of detection can be improved, and on the other hand, in the area where the first conductive lead does not extend, the second fine grid 20 can be a continuous and unbroken grid line, thereby collecting more carriers and improving the efficiency of the cell. In addition, a smaller connection ratio between the first conductive base point and the first fine grid means a smaller size of the first conductive base point, which can reduce the shadow shielding of the solar cell and improve the light absorption rate.

[0046] In some embodiments, the percentage ratio of the number of the second fine grids 20 electrically connected to the second conductive lead-out wire 60 to the total number of all the second fine grids 20 is greater than or equal to 50%. Since the first fine grid 10 and the second conductive lead-out wire 50 are insulated from each other, the first fine grid 10 has a poor effect on collecting carriers in the insulated area. By setting the ratio of the number of the second fine grids 10 electrically connected to the second conductive lead-out wire 50 to the total number of all the second fine grids 10 to 50%, on the one hand, the reliability of detection can be improved, and on the other hand, in the area where the second conductive lead does not extend, the first fine grid 10 can be a continuous and unbroken grid line, thereby collecting more carriers and improving the efficiency of the cell. In addition, a smaller connection ratio between the second conductive base point 40 and the second fine grid 20 means a smaller size of the second conductive base point, which can reduce the shadow shielding of the solar cell and improve the light absorption rate.

[0047] Such asFigure 1 and Figure 2 As shown, in particular, the center lines of the first conductive base point 30 and the second conductive base point 40 are collinear in the first direction, which can ensure that the first conductive base point 30 and the second conductive base point 40 are collinear. Since there are probe rows both above and below the test mechanism, when using the test equipment, the probe rows can simultaneously contact the first conductive base point 30 and the second conductive base point 40, facilitating probe contact detection.

[0048] As Figure 3 shown, in other embodiments, the center lines of the first conductive base point 30 and the second conductive base point 40 may not be collinear in the first direction. In this way, the probe contacting the non-collinear conductive base points can also measure the electrical condition of the solar cell.

[0049] As Figure 1 shown, in some embodiments, the number of the first fine grids 10 connected to the first conductive base point 30 is different from the number of the second fine grids 20 connected to the second conductive base point 40. The first conductive base point 30 is connected to 1 first fine grid, and the second conductive base point 40 is connected to 2 second fine grids.

[0050] As Figure 2 shown, in other embodiments, the number of the first fine grids 10 connected to the first conductive base point 30 is the same as the number of the second fine grids 20 connected to the second conductive base point 40. The first conductive base point 30 is connected to 2 first fine grids, and the second conductive base point 40 is connected to 2 second fine grids. In the embodiments of the present application, it can be flexibly set according to the production process conditions, and the present application does not limit this.

[0051] The first conductive base point 30 and the second conductive base point 40 are arranged on the same plane. The projected area of the first conductive base point 30 on the plane is the first area, and the projected area of the second conductive base point 40 on the plane is the second area. The first area and the second area are equal. The same plane can be the surface of the battery chip. The first conductive base point 30 and the second conductive base point 40 have the same projected area on the same plane, that is, the first conductive base point 30 and the second conductive base point 40 have the same contact area. On the one hand, it can ensure the stability of probe contact, and on the other hand, it is convenient to set multiple conductive base points synchronously at one time, optimizing the process flow of conductive base point setting.

[0052] Furthermore, the projections of the first conductive base point 30 and the second conductive base point 40 on the same plane can be at least one of a square structure, a rectangular structure, and an oval structure. In the embodiments of the present application, there are not too many restrictions on the specific structure of the conductive base point. In actual use, those skilled in the art can set it according to needs.

[0053] In some embodiments, in a direction perpendicular to the plane where the cell 10 is located, the height of the first conductive base point 30 and the height of the second conductive base point 40 are both greater than the thickness of the fine grid, so that the conductive base points protrude from the surface of the cell, facilitating probe contact.

[0054] In the embodiments of the present application, the number of the first conductive lead-out lines 50 is two, and the two first conductive lead-out lines 50 are arranged at opposite ends of the first conductive base point 30 in the second direction. The two first conductive lead-out lines 50 extend along the second direction respectively and are in electrical contact with the first fine grid 10. Correspondingly, the number of the second conductive lead-out lines 60 is two, and the two second conductive lead-out lines 60 are arranged at opposite ends of the second conductive base point 40 in the second direction. The two second conductive lead-out lines 60 extend along the second direction respectively and are in electrical contact with the second fine grid 20, so that the detection of the entire solar cell can be completed when the probe contacts the conductive base point.

[0055] Further, the width of the first conductive lead-out line 50 is greater than the width of the first fine grid 10, and the width of the second conductive lead-out line 60 is greater than the width of the second fine grid 20. Thus, when the first conductive lead-out line 50 is connected to the first fine grid 10, there is a more stable conductive contact, and when the second conductive lead-out line 60 is connected to the second fine grid 20, there is a more stable conductive contact.

[0056] In some embodiments of the present application, the width of the first conductive lead-out line 50 is 0.02 - 0.03 mm; the width of the second conductive lead-out line 60 is 0.02 - 0.03 mm. As an example, the width of the first conductive lead-out line 50 can be 0.02 mm, 0.022 mm, 0.025 mm, 0.027 mm, 0.03 mm. As an example, the width of the second conductive lead-out line 60 can be 0.02 mm, 0.022 mm, 0.025 mm, 0.027 mm, 0.03 mm, and the present application does not limit this.

[0057] In some embodiments, a plurality of first fine grids 10 are arranged at equal intervals in the second direction at a first preset distance, and a plurality of second fine grids 20 are arranged at equal intervals in the second direction at a second preset distance.

[0058] The range of the first preset distance is 60 - 80 μm. Specifically, in such an embodiment, the first preset distance can be 60 μm, 65 μm, 70 μm, 75 μm, 80 μm or any value between 60 - 80 μm, and specific values are not limited herein.

[0059] The range of the second preset distance is 60-80 μm. Specifically, in such an embodiment, the second preset distance can be 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, or any value between 60-80 μm. Specifically, no limitation is made here.

[0060] In the embodiment of the present application, multiple first fine grids 10 are arranged at equal intervals in the second direction with a first preset distance, and multiple second fine grids 20 are arranged at equal intervals in the second direction with a second preset distance, which can make the distribution of the fine grid lines more uniform and enable the overall circuit to work more stably.

[0061] In other embodiments, the first preset distance and the second preset distance can be equal or unequal, and those skilled in the art can arrange them flexibly according to needs. The present application does not limit this.

[0062] A solar cell includes the electrode structure of the above-mentioned solar cell. The technical effects of the solar cell are the same as those of the electrode structure of the solar cell, and will not be elaborated here.

[0063] A solar cell module includes the above-mentioned solar cell. Based on the above-mentioned solar cell, those skilled in the art know that by using multiple such solar cells and / or other corresponding existing accessories, the corresponding battery module can be obtained.

[0064] In this embodiment, multiple solar cells in the battery module can be connected in series in sequence to form a battery string, so as to realize the series connection and current output of the current. For example, the connection of the battery chips can be realized by setting solder strips (bus bars, interconnection bars), conductive backplanes, etc. It can be understood that in such an embodiment, the battery module may further include a metal frame, a backplane, a photovoltaic glass, and a glue film. The glue film can be filled between the front and back of the back-contact battery, the photovoltaic glass, adjacent battery chips, etc. As a filler, it can be a transparent colloid with good light transmission performance and aging resistance. For example, the glue film can adopt an EVA glue film or a POE glue film, and can be specifically selected according to the actual situation. No limitation is made here.

[0065] In the description of this specification, the descriptions with reference to terms such as "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0066] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An electrode structure of a solar cell, characterized in that, It includes a plurality of first fine grids and a plurality of second fine grids. The plurality of first fine grids and the plurality of second fine grids extend along a first direction and are alternately distributed at intervals along a second direction. The first direction intersects the second direction, and the first fine grids and the second fine grids have different polarities; a first conductive contact structure, which includes a first conductive base point and a first conductive lead-out wire. One end of the first conductive lead-out wire is connected to the first conductive base point, and the other end of the first conductive lead-out wire extends along the second direction. The first conductive base point is in electrical contact with some of the first fine grids, and the first conductive lead-out wire is in electrical contact with another part of the first fine grids; a second conductive contact structure, which includes a second conductive base point and a second conductive lead-out wire. One end of the second conductive lead-out wire is connected to the second conductive base point, and the other end of the second conductive lead-out wire extends along the second direction. The second conductive base point is in electrical contact with some of the second fine grids, and the second conductive lead-out wire is in electrical contact with another part of the second fine grids.

2. The electrode structure of the solar cell according to claim 1, characterized in that, The first conductive contact structure is in electrical contact with all of the first fine grids, and the second conductive contact structure is in electrical contact with all of the second fine grids.

3. The electrode structure of the solar cell according to claim 1, characterized in that, The first conductive lead-out wire and the second fine grids are insulated from each other, and the second conductive lead-out wire and the first fine grids are insulated from each other.

4. The electrode structure of the solar cell according to claim 1, characterized in that, The ratio percentage of the number of the first fine grids electrically connected by the first conductive lead-out wire to the total number of all the first fine grids is greater than or equal to 50%.

5. The electrode structure of the solar cell according to claim 1, characterized in that, The ratio percentage of the number of the second fine grids electrically connected by the second conductive lead-out wire to the total number of all the second fine grids is greater than or equal to 50%.

6. The electrode structure of the solar cell according to claim 1, characterized in that, The center lines of the first conductive base point and the second conductive base point are collinear in the first direction.

7. The electrode structure of the solar cell according to claim 1, characterized in that The number of the first fine grids connected by the first conductive base point is different from the number of the second fine grids connected by the second conductive base point.

8. The electrode structure of the solar cell according to claim 1, characterized in that, The number of the first fine grids connected by the first conductive base point is the same as the number of the second fine grids connected by the second conductive base point.

9. The electrode structure of the solar cell according to claim 1, characterized in that, The width of the first conductive lead-out wire is greater than the width of the first fine grid, and the width of the second conductive lead-out wire is greater than the width of the second fine grid.

10. The electrode structure of the solar cell according to claim 1, characterized in that, The first conductive base point and the second conductive base point are arranged on the same plane. The projected area of the first conductive base point on the plane is a first area, and the projected area of the second conductive base point on the plane is a second area. The first area and the second area are equal.

11. The electrode structure of the solar cell according to claim 1, characterized in that, The plurality of first fine grids are equidistantly spaced along the second direction at a first preset distance, and the plurality of second fine grids are equidistantly spaced along the second direction at a second preset distance.

12. The electrode structure of the solar cell according to claim 11, wherein, The range of the first preset distance is 60 - 80 μm.

13. The electrode structure of the solar cell according to claim 11, characterized in that, The range of the second preset distance is 60 - 80 μm.

14. A solar cell, characterized in that, It includes the electrode structure of the solar cell according to any one of claims 1 to 13.

15. A solar cell module, characterized in that, The solar cell module includes the solar cell according to claim 14.

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