Solar cell and photovoltaic module

Abstract

The embodiment of the invention provides a solar cell and a photovoltaic module, and the solar cell comprises a cell body which comprises a first surface and a second surface which are opposite to each other; the plurality of collector grid lines are arranged on the first surface of the battery piece body; the plurality of separators are arranged on the first surface and / or the second surface of the battery piece body, and the extension direction of the separators intersects with the extension direction of the collector grid lines; the isolation piece comprises a plurality of isolation salient points which are arranged along the extension direction of the isolation piece; the distance between every two adjacent isolation protruding points in the same isolation piece in the extending direction of the isolation piece is larger than the distance between every two adjacent current collection grid lines, the solar cell can be isolated and protected, the second face of the solar cell is prevented from being scratched, and the manufacturing cost of the isolation piece is low.

Description

Technical Field

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

[0002] At present, in order to improve the photoelectric conversion efficiency and aesthetics of solar cells, back contact (BC) cells in which both positive and negative electrodes are arranged on the back of the cell have emerged.

[0003] When transporting back-contact cells, the back-contact cells are usually stacked, and the positive and negative electrodes of the back-contact cells are in contact with the light-receiving surfaces of adjacent back-contact cells, which can easily cause scratches on the light-receiving surfaces of the back-contact cells.

[0004] Application Contents

[0005] In view of the above problems, the embodiments of the present application are proposed to provide a solar cell and a photovoltaic module that overcome the above problems or at least partially solve the above problems.

[0006] In order to solve the above problems, the present application discloses a solar cell, including:

[0007] A battery cell body, comprising a first surface and a second surface opposite to each other;

[0008] A plurality of collector grid lines are arranged on the first surface of the battery cell body;

[0009] A plurality of isolation members are arranged on the first surface and / or the second surface of the battery cell body, and the extension direction of the isolation members intersects with the extension direction of the collector grid lines; the isolation members include a plurality of isolation protrusions arranged along the extension direction of the isolation members; the distance between two adjacent isolation protrusions in the same isolation member in the extension direction of the isolation member is greater than the distance between two adjacent collector grid lines.

[0010] Optionally, a distance between two adjacent isolation bumps in the same isolation member in a direction perpendicular to the collector grid lines is greater than a distance between the two adjacent collector grid lines.

[0011] Optionally, the plurality of collector gate lines include first collector gate lines and second collector gate lines which are alternately arranged in sequence along a direction perpendicular to the collector gate lines;

[0012] The distance between two adjacent isolation bumps in the same isolation member in the extension direction of the isolation member is greater than the distance between two adjacent first collector gate lines;

[0013] And / or, a distance between two adjacent isolation bumps in the same isolation member in the extension direction of the isolation member is greater than a distance between two adjacent second collector grid lines.

[0014] Optionally, a distance between two adjacent isolation bumps in the same isolation member in a direction perpendicular to the collector gate line is greater than a distance between two adjacent first collector gate lines;

[0015] And / or, the distance between two adjacent isolation protrusions in the same isolation member in a direction perpendicular to the collector grid lines is greater than the distance between two adjacent second collector grid lines.

[0016] Optionally, the solar cell further comprises a solder pad, and the height of the isolation bump is greater than or equal to the height of the higher one of the collector grid line and the solder pad;

[0017] Alternatively, the solar cell further comprises a solder pad and a busbar line, and the height of the isolation bump is greater than or equal to the height of the higher one among the solder pad, the collector bar line and the busbar line;

[0018] Alternatively, the solar cell further comprises a soldering pad and an end line, each of the plurality of collector grid lines located at the edge of the cell body comprises a plurality of collector grid line segments arranged in sequence along an extension direction of the collector grid lines, the end line is electrically connected to the plurality of collector grid line segments located at the edge of the cell body, and the height of the isolation bump is greater than or equal to the height of the higher one among the soldering pad, the collector grid line and the end line.

[0019] Optionally, the isolation member is arranged on the second surface, and a projection of at least one of the isolation bumps on the first surface has an overlapping area with the collector grid line.

[0020] Optionally, along the extension direction of the isolation member, the distance between two adjacent isolation protrusions in the same isolation member ranges from 0.48 mm to 2 mm.

[0021] Optionally, a distance between two adjacent isolation bumps in the same isolation member in a direction perpendicular to the collector grid line ranges from 0.3 mm to 1.5 mm.

[0022] Optionally, the distance between two adjacent collector grid lines ranges from 0.3 mm to 1.5 mm.

[0023] Optionally, the plurality of collector gate lines include first collector gate lines and second collector gate lines which are alternately arranged in sequence along a direction perpendicular to the collector gate lines;

[0024] Part of the first collector grid lines located on at least one side edge of the battery cell body includes a plurality of first sub-collector grid lines that are spaced apart, and part of the second collector grid lines includes a plurality of second sub-collector grid lines that are spaced apart, and the first sub-collector grid lines and the second sub-collector grid lines are arranged alternately; a plurality of the first sub-collector grid lines arranged in a direction perpendicular to the collector grid lines are electrically connected together through a first terminal line, and a plurality of the second sub-collector grid lines arranged in a direction perpendicular to the collector grid lines are electrically connected together through a second terminal line.

[0025] Optionally, the height of the isolation bump is in the range of 3 μm-80 μm.

[0026] Optionally, the maximum size of the isolation bump is D, 50 μm≤D≤2000 μm.

[0027] Optionally, the coverage of the first surface and / or the second surface by the isolation bump is A, and 0.5%≤A≤10%.

[0028] In a second aspect, the embodiment of the present application further discloses a photovoltaic assembly, including a plurality of battery strings, wherein the battery strings include a plurality of solar cells and a plurality of interconnectors, wherein the interconnectors are used to connect the plurality of solar cells in series;

[0029] Wherein, the solar cell is the above-mentioned solar cell.

[0030] The embodiments of the present application include the following advantages:

[0031] In the embodiment of the present application, the collector grid line is arranged on the first surface of the cell body, and the spacer is arranged on the first surface and / or the second surface of the cell body. In this way, during the stacking and transportation of the solar cell, the spacer can be present between two adjacent cell bodies to play an isolating and protective role, so as to prevent the collector grid line, bus grid line, terminal line or pad on one solar cell from scratching the second surface of another solar cell. On the basis of the protective role played by the spacer, since the spacer includes a plurality of isolation convex points along its extension direction, the spacing between two adjacent isolation convex points in the same spacer in the extension direction of the spacer is greater than the spacing between two adjacent collector grid lines, so that the isolation convex points are arranged relatively sparsely, which not only saves the manufacturing cost of the spacer, but also reduces the number of isolation convex points, which can reduce shading and improve the absorption rate of light by the cell body. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the arrangement structure of an isolator and a collector grid line of the present application;

[0033] Figure 2It is a schematic diagram of the arrangement structure of another isolating member and collector grid line of the present application;

[0034] Figure 3 It is a schematic diagram of the arrangement structure of another isolating member and collector grid line of the present application;

[0035] Figure 4 It is a schematic diagram of the arrangement structure of an isolation member of the present application;

[0036] Figure 5 This is a schematic diagram of the arrangement structure of a collector grid line of the present application.

[0037] Description of reference numerals:

[0038] 1. Battery cell body; 11. First region; 12. Second region; 13. Third region; 14. Fourth region; 2. Isolation member; 21. Isolation bump; 3. Collector grid line; 31. First collector grid line; 311. First sub-collector grid line; 32. Second collector grid line; 321. Second sub-collector grid line. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0041] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In the first aspect, one of the core concepts of the embodiments of the present application is to disclose a solar cell, the solar cell comprising: a cell body 1, comprising a first surface and a second surface opposite to each other; a plurality of collector grid lines 3, arranged on the first surface of the cell body 1; a plurality of spacers 2, arranged on the first surface and / or the second surface of the cell body 1, such as Figure 1 As shown, the extending direction of the isolation member 2 intersects with the extending direction of the collector grid line 3 ; the isolation member 2 includes a plurality of isolation bumps 21 arranged along the extending direction of the isolation member 2 .

[0044] It should be noted that, in the embodiment of the present application, a plurality of closely spaced isolation bumps 21 continuously arranged in a row constitute an isolation member 2. Figure 1 As shown, a plurality of isolation bumps 21 connected by a dotted arrow line are combined to form an isolation member 2, that is, Figure 1 Five spacers 2 are shown schematically in FIG.

[0045] Specifically, if Figure 1 and Figure 2 As shown, the extending direction of the collector grid line 3 is parallel to the direction S1, the extending direction of the spacer 2 is parallel to the direction S2, the extending direction of the spacer 2 and the extending direction of the collector grid line 3 may be non-perpendicular, and a plurality of spacers 2 are arranged at intervals along a direction S3 perpendicular to the collector grid line 3, and the direction S2 intersects with the direction S3. Figure 3 As shown, the extending direction of the isolation member 2 and the extending direction of the collector grid line 3 may be perpendicular to each other, and the direction S2 is the same as the direction S3.

[0046] In some examples, the distance between two adjacent isolation bumps 21 in the same isolation member 2 in the extension direction of the isolation member 2 is greater than the distance between two adjacent collector gate lines 3 .

[0047] In the embodiment of the present application, the collector grid line 3 is arranged on the first surface of the cell body 1, and the spacer 2 is arranged on the first surface and / or the second surface of the cell body 1. In this way, in the process of stacking and transporting the solar cell sheets, the spacer 2 can be present between two adjacent cell bodies 1 to play the role of isolation and protection, and prevent the collector grid line, bus grid line, terminal line or pad on one solar cell from scratching the second surface of another solar cell. On the basis of the protective role played by the spacer 2, since the spacer 2 includes a plurality of isolation bumps 21 along its extension direction, the spacing between two adjacent isolation bumps 21 in the same spacer 2 in the extension direction of the spacer 2 is greater than the spacing between two adjacent collector grid lines 3, so that the isolation bumps 21 are arranged relatively sparsely, which not only saves the manufacturing cost of the spacer 2, but also reduces the number of isolation bumps 21, which can reduce shading and improve the light absorption rate of the cell body 1.

[0048] The solar cell in the embodiment of the present application is the core component of the solar panel. Its main working principle is to use the photovoltaic effect to generate electric current to directly convert sunlight into electrical energy. It can be applied to solar panels, solar cell groups, solar street lights, solar mobile power supplies and other fields.

[0049] In the embodiment of the present application, the cell body 1 is the main structure of the solar cell, having a first surface and a second surface relative to each other. One of the first surface and the second surface can be the light-receiving surface of the solar cell, for receiving incident light, and the other surface can be the backlight surface of the solar cell, which is arranged away from the light-receiving surface.

[0050] Specifically, the above-mentioned busbar line, collector grid line 3, terminal line, and pad are all arranged on the first surface of the battery cell body 1. Among them, the busbar line is the main grid on the battery cell body 1, and the collector grid line 3 is the fine grid on the battery cell body 1. In addition, the above-mentioned collector grid line 3 can be a positive grid line or a negative grid line.

[0051] Specifically, the spacer 2 may be arranged on the first surface of the battery cell body 1, or on the second surface of the battery cell body 1, or, the spacer 2 may be arranged on both the first surface and the second surface of the battery cell body 1. In the embodiment of the present application, the collector grid line 3 and the spacer 2 may be arranged on the same surface of the battery cell body 1, or, the collector grid line 3 and the spacer 2 may be arranged on two opposite surfaces of the battery cell body 1, respectively.

[0052] Specifically, in the production and preparation process of photovoltaic modules, after the solar cells are prepared, it is usually necessary to use a material box to hold the solar cells, and use the material box to transfer the solar cells to the subsequent process for assembling the photovoltaic module. In the process of loading the solar cells into the material box, the solar cells can be sucked by the loading mechanism and moved to a preset position above the material box, and then the solar cells are released, so that the solar cells naturally fall to the material box, and multiple solar cells can be stacked in sequence. Among two adjacent solar cells, the light-receiving surface of one solar cell contacts the backlight surface of another solar cell, or the light-receiving surfaces of the two solar cells contact, and there is a risk that the collector grid line 3, the busbar line, the terminal line or the pad of one solar cell will scratch the light-receiving surface of another solar cell, affecting the quality of the photovoltaic module.

[0053] In the embodiment of the present application, since the isolation member 2 is arranged on the first surface and / or the second surface of the cell body 1, the isolation member 2 can separate two adjacent solar cells in the two stacked solar cells, so that the isolation member 2 can isolate and protect the light-receiving surface of the solar cell, thereby reducing the risk of scratching the light-receiving surface of the solar cell.

[0054] In some embodiments, the extension direction of the isolation member 2 may intersect with the extension direction of the collector grid line 3 to ensure that when the solar cells are stacked, at least part of the isolation member 2 can always isolate and protect the light-receiving surfaces of adjacent solar cells.

[0055] It is understandable that if Figure 3 As shown, the extension direction of the isolation member 2 may be perpendicular to the extension direction of the collector grid line 3; or Figure 2 As shown, the extending direction of the isolating member 2 and the extending direction of the collector grid line 3 are arranged to form an acute angle or an obtuse angle.

[0056] Here, the extension direction of the isolation member 2 can be set at an angle with the extension direction of the collector grid line 3, and the angle range can be, for example, 30° to 150°, to ensure that the isolation member 2 is tilted relative to the collector grid line 3, so that the isolation member 2 can isolate and protect the light-receiving surface of the solar cell.

[0057] For example, the angle may be set to any angle such as 30°, 45°, 60°, 75°, 80°, 90°, 110°, 120°, 135°, 150°, or a range between any two angles.

[0058] Specifically, if Figure 3 As shown, a row of isolation bumps 21 connected by a dotted arrow line is combined to form an isolation member 2. Multiple isolation members 2 can be arranged at intervals along the extension direction of the collector grid line 3, or, as shown in FIG. Figure 1 and Figure 2 As shown, a row of isolation bumps 21 strung together by an arrow dashed line form an isolation member 2. Multiple isolation members 2 may also be arranged at intervals along a direction intersecting with the extension direction of the collector grid line 3. This embodiment of the present application does not specifically limit this.

[0059] In some embodiments, the extending directions of all the spacers 2 may be the same.

[0060] In other embodiments, the extension directions of the plurality of isolating members 2 may not be completely the same, for example, Figure 4 As shown, the first surface and / or the second surface may include four regions, namely the first region 11, the second region 12, the third region 13 and the fourth region 14; the first region 11 and the second region 12 are arranged along the extension direction of the collector grid line 3, and the third region 13 and the fourth region 14 are arranged along the extension direction of the collector grid line 3; the first region 11 and the third region 13 are arranged in a direction perpendicular to the collector grid line 3, and the second region 12 and the fourth region 14 are arranged in a direction perpendicular to the collector grid line 3; the isolating member 2 arranged in the second region 12 and the third region 13 is a first isolating member, and all the first isolating members have the same extension direction, and the isolating member 2 arranged in the first region 11 and the fourth region 14 is a second isolating member, and all the second isolating members have the same extension direction, and the extension direction of the first isolating member intersects with the extension direction of the second isolating member. Among them, a row of isolation bumps 21 strung together by arrow line A1 is combined to form a first isolation member in the first area 11, a row of isolation bumps 21 strung together by arrow line A2 is combined to form a second isolation member in the second area 12, a row of isolation bumps 21 strung together by arrow line A3 is combined to form a second isolation member in the third area 13, and a row of isolation bumps 21 strung together by dotted arrow line A4 is combined to form a first isolation member in the fourth area.

[0061] In an embodiment of the present application, the first surface and / or the second surface is divided into four areas. Among the four areas, the extension directions of the isolation members 2 in two areas distributed along the diagonal line are the same, and the extension directions of the isolation members 2 in two adjacent areas are different. In this way, during the stacking process of solar cell sheets, no matter whether the solar cell sheets are deflected or bent, it can be ensured that the isolation members 2 can isolate and protect the light-receiving surfaces of adjacent solar cell sheets.

[0062] Specifically, the multiple isolation members 2 on the first surface and / or the second surface may be distributed in an axisymmetric manner or in a non-axisymmetric manner, etc., and this embodiment of the present application does not specifically limit this.

[0063] Specifically, the spacer 2 may include a plurality of spaced apart spacer bumps 21 along its extension direction, which can reduce the coverage of the first surface and / or the second surface by the spacer 2, and can reduce the manufacturing cost of the spacer 2. In addition, by reducing the coverage of the light-receiving surface of the solar cell, the light-receiving surface of the solar cell can be shielded, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0064] In some examples, the distance between two adjacent isolation bumps 21 in the same isolation member 2 in the extension direction of the isolation member 2 is greater than the distance between two adjacent collector grid lines 3. Since the isolation bumps 21 are arranged relatively sparsely, it is convenient to further reduce the coverage of the isolation bumps 21 on the first surface and / or the second surface.

[0065] For example, Figures 1 to 3 As shown, the collector grid line 3 extends along the S1 direction, the isolation member 2 extends along the S2 direction, the distance between two adjacent isolation bumps 21 in the same isolation member 2 in the S2 direction is L1, and the distance between two adjacent collector grid lines 3 is L2, L1>L2.

[0066] It should be noted that, in the present application, the spacing between two adjacent collector grid lines 3 is the width of the gap between two adjacent collector grid lines 3 in the S3 direction, that is, the spacing between the boundaries of two adjacent collector grid lines 3 in the S3 direction, that is, the minimum spacing between two adjacent collector grid lines 3 in the S3 direction. The spacing between two adjacent isolation bumps 21 can be the spacing between the centers of two adjacent isolation bumps 21, that is, the spacing between the centers of two adjacent isolation bumps 21, or it can also be the width of the gap between two adjacent isolation bumps 21, that is, the spacing between the boundaries of two adjacent isolation bumps 21, that is, the minimum distance between two adjacent isolation bumps 21.

[0067] For example, the distance between two adjacent isolation bumps 21 in the same isolation member 2 in the extension direction of the isolation member 2 can be the distance between the centers of two adjacent isolation bumps 21 in the same isolation member 2 in the extension direction of the isolation member 2, or the minimum distance between two adjacent isolation bumps 21 in the same isolation member 2 in the extension direction of the isolation member 2.

[0068] The distance between two adjacent isolation bumps 21 in the same isolation member 2 in the direction perpendicular to the collector grid line 3 can be the distance between the centers of two adjacent isolation bumps 21 in the same isolation member 2 in the direction perpendicular to the collector grid line 3, or the minimum distance between two adjacent isolation bumps 21 in the same isolation member 2 in the direction perpendicular to the collector grid line 3.

[0069] In some examples, the isolation bump 21 is made of a material that is easy to vaporize (a low boiling point material), such as polyvinyl alcohol (PVA), the melting point of PVA is about 100°C, and the boiling point of PVA is about 180°C. When the solar cells are stacked and transported in a room temperature environment, since the ambient temperature is lower than the melting point of the isolation bump 21, the shape of the isolation bump 21 is relatively stable, which can effectively isolate and protect the light-receiving surface of the solar cell. When it is necessary to remove the isolation bump 21, the solar cell can be heated to a temperature above the boiling point of the isolation bump 21, so that the isolation bump 21 is vaporized and removed. For example, if PVA material is used, the subsequent heating temperature can be greater than 180°C.

[0070] However, the heating process does not completely vaporize the isolation bumps 21. Some of them will remain on the first side and / or the second side of the cell body 1 to form a number of isolation marks arranged at intervals. The isolation marks can be used as marking points (mark points) in subsequent processes. For example, the isolation marks can be used as marking points when preparing a polymer layer on the surface of a solar cell. The polymer layer can be, for example, an EVA layer or a POE layer or a composite layer of the two. For another example, solar cells, polymer layers, glass, etc. need to undergo a hot pressing process to form a photovoltaic module. The isolation marks can be used as marking points during the hot pressing process.

[0071] In other examples, the isolation bump 21 may also be made of a material that is not easily vaporized, that is, the melting point and boiling point of the isolation bump 21 are relatively high. When the photovoltaic module is prepared, the isolation bump 21 will not melt or vaporize and can still remain on the first side and / or second side of the battery cell body 1.

[0072] Specifically, the isolation bump 21 can be a transparent member with light-transmitting properties, and the light transmittance can be greater than 80%, or the isolation bump 21 can also be a light-shielding member with light-shielding properties. The isolation bump 21 can be a regular hemispherical dot, or it can also be an irregular bump. Of course, the surface of the isolation bump 21 away from the battery cell body 1 can also have a depression, etc., and the embodiment of the present application does not specifically limit this.

[0073] In the embodiment of the present application, the collector grid lines 3 may be arranged regularly on the first surface. The spacers 2 may be arranged regularly on the first surface and / or the second surface, or the spacers 2 may be arranged regularly on at least one local area of ​​the first surface and / or the second surface, and the spacers 2 may not be provided for other areas, or the spacers 2 in other areas may be irregularly distributed. Specifically, Figures 1 to 3 As shown, only a local area of ​​the first surface and / or the second surface is schematically illustrated. The arrangement of the isolation member 2 and the collector grid line 3 can be referred to in the above description, and the present application will not elaborate on it here.

[0074] In some optional embodiments of the present application, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in a direction perpendicular to the collector grid line 3 is greater than the spacing between two adjacent collector grid lines 3. Under the premise of ensuring that the isolation member 2 isolates and protects the light-receiving surface of the solar cell, the sparsity of the isolation bumps 21 can be improved to reduce the production cost of the isolation bumps 21 and improve the light absorption rate of the solar cell.

[0075] Specifically, Figures 1 to 3 As shown, the distance between two adjacent isolation bumps 21 in the same isolation member 2 in the direction S3 perpendicular to the collector grid line 3 is L3, and the distance between two adjacent collector grid lines 3 is L2, where L3>L2.

[0076] In some other optional embodiments of the present application, the spacing between two adjacent isolation protrusions 21 in the same isolation member 2 in a direction perpendicular to the collector grid line 3 may also be smaller than the spacing between two adjacent collector grid lines 3, so as to more effectively prevent the collector grid line 3, bus grid line, terminal line or welding pad of a solar cell from scratching another solar cell stacked therewith.

[0077] In some optional embodiments, the plurality of collector gate lines 3 include first collector gate lines 31 and second collector gate lines 32 arranged alternately in sequence along a direction perpendicular to the collector gate lines 3; one of the first collector gate lines 31 and the second collector gate lines 32 is a positive gate line, and the other is a negative gate line.

[0078] Optionally, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in the extension direction of the isolation member 2 is greater than the spacing between two adjacent first collector grid lines 31. In this way, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in the extension direction of the isolation member 2 is greater than the spacing between collector grid lines 3 of the same polarity, which can further increase the sparsity of the isolation bumps 21, reduce the number of isolation bumps 21, reduce the manufacturing cost of the isolation bumps 21 and the coverage of the isolation bumps 21 on the battery cell body 1, and improve the light absorption rate of the battery cell body 1.

[0079] Specifically, Figures 1 to 3 As shown, the distance between two adjacent first collector grid lines 31 is L4, and L1>L4.

[0080] In other embodiments, the distance between two adjacent isolation protrusions 21 in the same isolation member 2 in the extension direction of the isolation member 2 is smaller than the distance between two adjacent first collector grid lines 31, so as to more effectively prevent the collector grid line 3, bus grid line, terminal line or welding pad of a solar cell from scratching another solar cell stacked therewith.

[0081] Optionally, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in the extension direction of the isolation member 2 is greater than the spacing between two adjacent second collector grid lines 32. In this way, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in the extension direction of the isolation member 2 is greater than the spacing between collector grid lines 3 of the same polarity, which can further increase the sparsity of the isolation bumps 21 and reduce the manufacturing cost of the isolation bumps 21.

[0082] Specifically, Figures 1 to 3 As shown, the distance between two adjacent second collector grid lines 32 is L5, and L1>L5.

[0083] In an embodiment of the present application, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in the extension direction of the isolation member 2 may be greater than the spacing between two adjacent first collector grid lines 31; or, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in the extension direction of the isolation member 2 may be greater than the spacing between two adjacent second collector grid lines 32; or, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in the extension direction of the isolation member 2 may be greater than both the spacing between two adjacent first collector grid lines 31 and the spacing between two adjacent second collector grid lines 32.

[0084] In other embodiments, the distance between two adjacent isolation protrusions 21 in the same isolation member 2 in the extension direction of the isolation member 2 is smaller than the distance between two adjacent second collector grid lines 32, so as to more effectively prevent the collector grid line 3, bus grid line, terminal line or welding pad of a solar cell from scratching another solar cell stacked therewith.

[0085] Optionally, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in a direction perpendicular to the collector grid line 3 is greater than the spacing between two adjacent first collector grid lines 31. In this way, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in a direction perpendicular to the collector grid line 3 is greater than the spacing between collector grid lines 3 of the same polarity, which can further increase the sparsity of the isolation bumps 21, reduce the number of isolation bumps 21, reduce the manufacturing cost of the isolation bumps 21, and improve the light absorption rate of the solar cell.

[0086] Specifically, Figures 1 to 3 As shown, the distance between two adjacent isolation bumps 21 in the same isolation member 2 in the direction S3 perpendicular to the collector grid line 3 is L3, and the distance between two adjacent first collector grid lines 31 is L4, where L3>L4.

[0087] Optionally, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in a direction perpendicular to the collector grid line 3 is greater than the spacing between two adjacent second collector grid lines 32. In this way, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in a direction perpendicular to the collector grid line 3 is greater than the spacing between collector grid lines 3 of the same polarity, which can further increase the sparsity of the isolation bumps 21, reduce the manufacturing cost of the isolation bumps 21, and improve the light absorption rate of the solar cell.

[0088] Specifically, Figures 1 to 3 As shown, the distance between two adjacent isolation bumps 21 in the same isolation member 2 in the direction S3 perpendicular to the collector grid line 3 is L3, and the distance between two adjacent second collector grid lines 32 is L5, where L3>L5.

[0089] In an embodiment of the present application, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in a direction perpendicular to the collector grid line 3 may be greater than the spacing between two adjacent first collector grid lines 31; or, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in a direction perpendicular to the collector grid line 3 may be greater than the spacing between two adjacent second collector grid lines 32; or, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in a direction perpendicular to the collector grid line 3 may be greater than both the spacing between two adjacent first collector grid lines 31 and the spacing between two adjacent second collector grid lines 32.

[0090] In some other optional embodiments of the present application, the spacing between two adjacent isolation protrusions 21 in the same isolation member 2 in the direction perpendicular to the collector grid line 3 may also be smaller than the spacing between two adjacent first collector grid lines 31, and / or, the spacing between two adjacent isolation protrusions 21 in the same isolation member 2 in the direction perpendicular to the collector grid line 3 may also be smaller than the spacing between two adjacent second collector grid lines 32, so that the spacing between two adjacent isolation protrusions 21 in the same isolation member 2 in the direction perpendicular to the collector grid line 3 is smaller than the spacing between two collector grid lines 3 of the same polarity, so as to more effectively prevent the collector grid line, bus grid line, terminal line, solder pad, etc. of a solar cell from scratching another solar cell stacked therewith.

[0091] In some optional embodiments, the height of the isolation bump 21 is greater than or equal to the height of the collector grid line 3. Thus, under the isolation effect of the isolation bump 21, the isolation bump 21 can directly contact the first surface of another stacked battery cell body 1, and the collector grid line 3 can be suspended. Alternatively, the isolation bump 21 can directly contact the collector grid line 3 on another stacked solar cell, which can effectively prevent the collector grid line 3 from rubbing and damaging the light-receiving surface of the solar cell.

[0092] In some examples, the isolation member 2 is arranged on the second surface, and the projection of at least one isolation convex point 21 on the first surface has an overlapping area with the collector grid line 3. With this technical solution, when multiple solar cells are stacked, it is easy to make at least one isolation convex point 21 on one solar cell contact with the collector grid line 3 on another solar cell, which can effectively prevent the collector grid line, bus grid line, pad, terminal line, etc. from scratching the surface of the cell body 1. Of course, in other examples, the projection of the isolation convex point 21 on the first surface may not have an overlapping area with the collector grid line 3. In this case, the isolation convex point 21 can be set by setting the height and number of the isolation convex point 21, the arrangement of multiple isolation convex points 21, the stacking of multiple solar cells, etc., so that the isolation convex point 21 can prevent the collector grid line, bus grid line, pad, terminal line, etc. from scratching the surface of the cell body 1.

[0093] In some optional embodiments, the isolation member 2 may be arranged on the first surface, and the isolation bump 21 may be arranged at intervals from the collector grid line 3 to prevent the isolation bump 21 from affecting the electrical connection between the bus grid line or the interconnection member and the collector grid line 3. The interconnection member may be a soldering tape or a conductive tape.

[0094] Specifically, the height of the isolation bump 21 is the dimension of the isolation bump 21 in a direction perpendicular to the first surface or the second surface, and the height of the collector grid line 3 is the dimension of the collector grid line 3 in a direction perpendicular to the first surface.

[0095] In some embodiments, the height of the isolation bump 21 may also be less than the height of the collector grid line 3 to reduce the manufacturing cost of the isolation bump 21. In this case, the height and number of the isolation bumps 21, the arrangement of multiple isolation bumps 21, the stacking of multiple solar cells, etc. can be set so that the isolation bump 21 can prevent the collector grid line, bus grid line, pad, terminal line, etc. from scratching the surface of the battery cell body 1.

[0096] Optionally, the height of the isolation bump 21 ranges from 3 μm to 80 μm.

[0097] In the embodiment of the present application, by reasonably setting the height range of the isolation bumps 21 , the isolation and protection effect of the isolation bumps 21 on the surface of the battery cell body 1 can be ensured.

[0098] For example, the height of the isolation bump 21 may be 3 μm, 12 μm, 20 μm, 50 μm, 58 μm, 65 μm, 76 μm, or 80 μm.

[0099] Optionally, the height of the collector grid line 3 is in the range of 10 μm-20 μm.

[0100] In the embodiment of the present application, by reasonably setting the height range of the collector grid line 3, it is possible to ensure that the collector grid line 3 collects current and reasonably match the height of the isolation bump 21. When stacking solar cells, the risk of the light-receiving surface of the solar cell being scratched by the collector grid line 3 is reduced.

[0101] For example, the height of the collector gate line 3 may be 10 μm, 12 μm, 15 μm, 16.8 μm, 18 μm, 19 μm or 20 μm.

[0102] In some embodiments, the solar cell includes a collector grid line and a pad, and the height of the isolation bump 21 is greater than or equal to the height of the higher one of the collector grid line 3 and the pad. This can prevent the collector grid line and the pad of one solar cell from contacting the light-receiving surface of another stacked solar cell, thereby ensuring that the isolation bump 21 can play an isolation and protection role, and prevent the collector grid line and the pad on one solar cell from scratching the light-receiving surface of another solar cell.

[0103] Specifically, the pads are used to be electrically connected to the interconnectors to connect different solar cells.

[0104] In other embodiments, the solar cell includes a collector grid line 3, a welding pad, and a bus grid line. The bus grid line is electrically connected to multiple collector grid lines 3 for merging the collected current together. The welding pad is electrically connected to the bus grid line. The height of the isolation bump 21 is greater than or equal to the height of the higher one of the welding pad, the collector grid line 3 and the bus grid line. This can prevent the welding pad, the collector grid line 3 and the bus grid line of one solar cell from contacting the light-receiving surface of another stacked solar cell, thereby ensuring that the isolation bump 21 can play an isolation and protection role, and prevent the welding pad, the collector grid line 3 and the bus grid line on one solar cell from scratching the light-receiving surface of another solar cell.

[0105] In some other embodiments, the solar cell includes a collector grid line, a welding pad and an end line. Each of the multiple collector grid lines located at the edge of the cell body 1 includes a plurality of collector grid line segments arranged in sequence along the extension direction of the collector grid line. The end line is electrically connected to the multiple collector grid line segments located at the edge of the cell body 1. Here, the multiple collector grid lines located in the middle area of ​​the cell body are continuously arranged, and the welding pad is arranged on the end line and the continuous collector grid lines. The height of the isolation protrusion 21 is greater than the height of the higher one of the welding pad, the collector grid line 3 and the end line. In this way, the collector grid line, the welding pad and the end line of one solar cell can be prevented from contacting the light-receiving surface of another stacked solar cell, so as to ensure that the isolation protrusion 21 can play an isolation and protection role to prevent the collector grid line, the welding pad and the end line on one solar cell from scratching the light-receiving surface of another solar cell.

[0106] Specifically, the terminal line is used to connect the collector gate lines 3 of the same polarity, and the terminal line may include a first terminal line connected to a plurality of first subset collector gate lines 311 , and a second terminal line connected to a plurality of second subset collector gate lines 321 .

[0107] In some optional embodiments, along the extension direction of the isolation member 2, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 ranges from 0.48 mm to 2 mm. When the spacing between two adjacent isolation bumps 21 is set within this range, the multiple isolation bumps 21 are arranged relatively sparsely, thereby reducing the production cost of the isolation member 2 and the shielding of the surface of the battery cell body 1, thereby improving the light absorption rate of the battery cell body 1.

[0108] For example, along the extension direction of the isolation member 2, the distance between two adjacent isolation bumps 21 in the same isolation member 2 can be 0.48 mm, 0.5 mm, 0.8 mm, 1.0 mm, 1.3 mm, 1.48 mm, 1.5 mm, 1.8 mm or 2.0 mm, etc.

[0109] In some optional embodiments, the spacing between two adjacent isolation bumps 21 in the same isolation member 2 in the direction perpendicular to the collector grid line 3 ranges from 0.3 mm to 1.5 mm. The isolation bumps 21 can be further arranged more sparsely, thereby reducing the production cost of the isolation member 2 and the shielding of the surface of the battery cell body 1, thereby improving the light absorption rate of the battery cell body 1.

[0110] For example, the distance between two adjacent isolation bumps 21 in the direction perpendicular to the collector grid line 3 can be 0.3 mm, 0.48 mm, 0.5 mm, 0.7 mm, 0.86 mm, 1.0 mm, 1.17 mm, 1.5 mm, etc.

[0111] Considering that when designing the collector grid lines 3, if the distance between two adjacent collector grid lines 3 is too close, it is easy to cause the positive and negative collector grid lines 3 to contact and short-circuit, and if the distance between two adjacent collector grid lines 3 is too far, the number of collector grid lines 3 is reduced, which is not conducive to the collection of carriers. Therefore, in some embodiments, the spacing between two adjacent collector grid lines 3 can be controlled within a range of 0.3 mm to 1.5 mm.

[0112] For example, the distance between two adjacent collector grid lines 3 may be 0.3 mm, 0.4 mm, 0.5 mm, 0.7 mm, 0.8 mm, 1.0 mm, 1.3 mm, 1.5 mm, etc.

[0113] In some optional embodiments of the present application, such as Figure 5As shown, the multiple collector grid lines 3 include first collector grid lines 31 and second collector grid lines 32 which are alternately arranged in sequence along a direction perpendicular to the collector grid lines 3; part of the first collector grid lines 31 located at the edge of at least one side of the battery cell body 1 includes multiple segments of first subset collector grid lines 311 distributed at intervals, and part of the second collector grid lines 32 includes multiple segments of second subset collector grid lines 321 distributed at intervals, and the first subset collector grid lines 311 and the second subset collector grid lines 321 are distributed alternately; the multiple first subset collector grid lines 311 arranged along a direction perpendicular to the collector grid lines 3 are electrically connected together through a first terminal line, and the multiple second subset collector grid lines 321 arranged along a direction perpendicular to the collector grid lines 3 are electrically connected together through a second terminal line.

[0114] In the embodiment of the present application, a plurality of first subset grid lines 311 are electrically connected together through the first terminal line, so that the interconnection piece is electrically connected to the first terminal line to achieve electrical connection with the plurality of first subset grid lines 311, and then the interconnection piece can be set at a certain distance from the edge of the battery cell body 1 to prevent the interconnection piece from being electrically connected to the first grid lines 31 located at the edge and causing damage to the edge of the battery cell body 1. A plurality of second subset grid lines 321 are electrically connected together through the second terminal line, so that the interconnection piece is electrically connected to the second terminal line to achieve electrical connection with the plurality of second subset grid lines 321, and then the interconnection piece can be set at a certain distance from the edge of the battery cell body 1 to prevent the interconnection piece from being electrically connected to the second grid lines 32 located at the edge and causing damage to the edge of the battery cell body 1.

[0115] It should be noted that if Figure 5 As shown, for the sake of easy distinction, solid and dotted lines are used to represent the first collector grid line 31 and the second collector grid line 32 respectively. In practical applications, the first collector grid line 31 and the second collector grid line 32 are both solid linear structures, not dot-interrupted.

[0116] Specifically, in some examples, such as Figure 5 As shown, part of the first collector grid lines 31 can be continuous, part of the first collector grid lines 31 can be segmented, part of the second collector grid lines 32 can be made continuous, and part of the second collector grid lines 32 can be made segmented. In other embodiments, all of the first collector grid lines 31 and the second collector grid lines 32 can also be made continuous.

[0117] The present application takes into account that when designing the isolation bump, the size of the isolation bump 21 is too small, which is difficult to realize in terms of process, and the size of the isolation bump 21 is too large, which blocks too much light and is not conducive to the light absorption of the battery cell body 1. Therefore, in some embodiments, the maximum size of the isolation bump 21 is D. When the projection of the isolation bump 21 on the first surface is circular or approximately circular, the maximum size is the diameter of the isolation bump 21, where 50μm≤D≤2000μm. In the embodiment of the present application, by limiting the diameter of the isolation bump 21, the manufacturing difficulty of the isolation member 2 is relatively low, and at the same time, the light absorption capacity of the battery cell body 1 can be guaranteed.

[0118] For example, the diameter of the isolation bump 21 may be 50 μm, 255 μm, 380 μm, 500 μm, 850 μm, 1150 μm, 1500 μm, 1860 μm, 1900 μm, 2000 μm, etc.

[0119] The present application considers that if the coverage of the isolation bump 21 on the first surface and / or the second surface is too small, the effect of the isolation bump 21 in preventing the surface of the battery cell body 1 from being scratched may be poor; if the coverage of the isolation bump 21 on the first surface and / or the second surface is too large, the light shielding will be more serious, which is not conducive to the light absorption of the battery cell body 1. Therefore, in some embodiments, the coverage of the isolation bump 21 on the first surface and / or the second surface is designed to be A, 0.5%≤A≤10%, so as to effectively ensure the effect of the isolation bump 21 in preventing the surface of the battery cell body 1 from being scratched, while ensuring the light absorption capacity of the battery cell body 1.

[0120] Specifically, when the isolation member 2 is arranged on the first surface and the second surface at the same time, the coverage rate of the isolation bumps 21 on the first surface and the coverage rate of the isolation bumps 21 on the second surface may be the same or different, and the embodiment of the present application does not specifically limit this.

[0121] For example, the coverage of the first surface or the second surface by the isolation bump 21 may be 0.5%, 1.2%, 2%, 3.6%, 4.1%, 5%, 6.5%, 7%, 7.8%, 8%, 9.3%, 10%, etc.

[0122] In some embodiments of the present application, the height of the isolation bump 21 can be made greater than the height of the collector grid line, the bus grid line, the terminal line, and the pad, and the isolation bump 21 can be designed to be relatively sparse, that is, the isolation bump 21 is designed to be large and sparse. In this way, when stacking solar cells, the isolation bump 21 can be used to overhead the collector grid line, the bus grid line, the terminal line, and the pad to avoid the risk of the collector grid line, the bus grid line, the terminal line, and the pad scratching the light-receiving surface of the adjacent solar cell, and the production cost of the isolation member 2 can be reduced, as well as the shielding of the surface of the cell body 1, thereby improving the light absorption rate of the cell body 1.

[0123] The solar cell described in the embodiment of the present application has at least the following advantages:

[0124] In the embodiment of the present application, the collector grid line is arranged on the first surface of the cell body, and the spacer is arranged on the first surface and / or the second surface of the cell body. In this way, during the stacking and transportation of the solar cell, the spacer can be present between two adjacent cell bodies to play an isolating and protective role, so as to prevent the collector grid line, bus grid line, terminal line or pad on one solar cell from scratching the second surface of another solar cell. On the basis of the protective role played by the spacer, since the spacer includes a plurality of isolation convex points along its extension direction, the spacing between two adjacent isolation convex points in the same spacer in the extension direction of the spacer is greater than the spacing between two adjacent collector grid lines, so that the isolation convex points are arranged relatively sparsely, which not only saves the manufacturing cost of the spacer, but also reduces the number of isolation convex points 21, which can reduce shading and improve the absorption rate of light by the cell body.

[0125] In a second aspect, an embodiment of the present application further discloses a photovoltaic module, comprising a plurality of battery strings, each battery string comprising a plurality of solar cells and a plurality of interconnecting members, wherein the interconnecting members are used to connect the plurality of solar cells in series; wherein the solar cell is the above-mentioned solar cell.

[0126] In the embodiment of the present application, multiple solar cells can be electrically connected together using interconnectors to achieve series connection of multiple solar cells, making it easier for photovoltaic modules to convert more electrical energy.

[0127] In the embodiment of the present application, the isolation member 2 plays an isolating and protective role on the surface of the cell body 1. Moreover, during the lamination process of the photovoltaic module, the isolation member 2 can also play a buffering role, which can reduce the stress of the solar cell at the interconnection parts during the lamination process, thereby reducing the risk of hidden cracks in the solar cell during the lamination process.

[0128] It should be noted that the photovoltaic assembly of the embodiment of the present application may include the solar cell in any of the above embodiments. The specific structure of the solar cell can be found in the above content, and the embodiment of the present application will not be repeated here.

[0129] Alternatively, the interconnect may be a soldering ribbon, a metal wire, a conductive tape, or the like.

[0130] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0131] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0132] The above is a detailed introduction to a solar cell and a photovoltaic module provided by the present application. Specific examples are used in this article 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 of the present application and its core idea. At the same time, for a person skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A solar cell, characterized in that: include: A battery cell body (1) comprising a first surface and a second surface opposite to each other; A plurality of collector grid lines (3) are arranged on the first surface of the battery cell body (1); A plurality of isolation members (2) are arranged on the first surface and / or the second surface of the battery cell body (1); the extension direction of the isolation members (2) intersects with the extension direction of the collector grid lines (3); the isolation members (2) include a plurality of isolation protrusions (21) arranged along the extension direction of the isolation members (2); the spacing between two adjacent isolation protrusions (21) in the same isolation member (2) in the extension direction of the isolation member (2) is greater than the spacing between two adjacent collector grid lines (3).

2. The solar cell according to claim 1, characterized in that: The distance between two adjacent isolation protrusions (21) in the same isolation member (2) in a direction perpendicular to the collector grid line (3) is greater than the distance between two adjacent collector grid lines (3).

3. The solar cell according to claim 1, characterized in that: The plurality of collector grid lines (3) include first collector grid lines (31) and second collector grid lines (32) which are alternately arranged in sequence along a direction perpendicular to the collector grid lines (3); The distance between two adjacent isolation protrusions (21) in the same isolation member (2) in the extension direction of the isolation member (2) is greater than the distance between two adjacent first collector grid lines (31); And / or, the distance between two adjacent isolation protrusions (21) in the same isolation member (2) in the extension direction of the isolation member (2) is greater than the distance between two adjacent second collector grid lines (32).

4. The solar cell according to claim 3, characterized in that: The distance between two adjacent isolation protrusions (21) in the same isolation member (2) in a direction perpendicular to the collector grid line (3) is greater than the distance between two adjacent first collector grid lines (31); And / or, the distance between two adjacent isolation protrusions (21) in the same isolation member (2) in a direction perpendicular to the collector grid line (3) is greater than the distance between two adjacent second collector grid lines (32).

5. The solar cell according to claim 1, characterized in that: The solar cell sheet also includes a solder pad, and the height of the isolation bump (21) is greater than or equal to the height of the higher one of the collector grid line (3) and the solder pad; Alternatively, the solar cell further comprises a solder pad and a busbar line, and the height of the isolation bump (21) is greater than or equal to the height of the higher one of the solder pad, the collector bar line (3) and the busbar line; Alternatively, the solar cell further comprises a welding pad and an end line, each of the plurality of collector grid lines (3) located at the edge of the cell body (1) comprises a plurality of collector grid line segments arranged in sequence along the extension direction of the collector grid line (3), the end line is electrically connected to the plurality of collector grid line segments located at the edge of the cell body (1), and the height of the isolation bump (21) is greater than or equal to the height of the higher one among the welding pad, the collector grid line (3) and the end line.

6. The solar cell according to claim 1, characterized in that: The isolation member (2) is arranged on the second surface, and a projection of at least one isolation bump (21) on the first surface has an overlapping area with the collector grid line (3).

7. The solar cell according to claim 1, characterized in that: Along the extension direction of the isolation member (2), the distance between two adjacent isolation protrusions (21) in the same isolation member (2) ranges from 0.48 mm to 2 mm; and / or, the distance between two adjacent isolation bumps (21) in the same isolation member (2) in a direction perpendicular to the collector grid line (3) is in the range of 0.3 mm to 1.5 mm; And / or, the spacing between two adjacent collector grid lines (3) ranges from 0.3 mm to 1.5 mm.

8. The solar cell according to claim 1, characterized in that: The plurality of collector grid lines (3) include first collector grid lines (31) and second collector grid lines (32) which are alternately arranged in sequence along a direction perpendicular to the collector grid lines (3); A portion of the first collector grid lines (31) located at at least one side edge of the battery cell body (1) comprises a plurality of first sub-collector grid lines (311) distributed at intervals, and a portion of the second collector grid lines (32) comprises a plurality of second sub-collector grid lines (321) distributed at intervals, the first sub-collector grid lines (311) and the second sub-collector grid lines (321) being arranged in an alternating manner; a plurality of the first sub-collector grid lines (311) arranged in a direction perpendicular to the collector grid lines (3) are electrically connected together via a first terminal line, and a plurality of the second sub-collector grid lines (321) arranged in a direction perpendicular to the collector grid lines (3) are electrically connected together via a second terminal line.

9. The solar cell according to claim 1, characterized in that: The height of the isolation bump (21) ranges from 3 μm to 80 μm; And / or, the maximum size of the isolation bump (21) is D, 50 μm≤D≤2000 μm; And / or, the coverage rate of the isolation bump (21) on the first surface and / or the second surface is A, 0.5%≤A≤10%.

10. A photovoltaic module, characterized in that: The invention comprises a plurality of battery strings, wherein the battery strings comprise a plurality of solar cells and a plurality of interconnectors, wherein the interconnectors are used to connect the plurality of solar cells in series; Wherein, the solar cell is the solar cell according to any one of claims 1-9.

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