Solar cell

Abstract

The utility model relates to a solar cell. The solar cell comprises a cell piece, a positive electrode welding strip and a negative electrode welding strip. A plurality of positive grid lines and a plurality of negative grid lines are arranged on the surface of the battery piece, the positive grid lines and the negative grid lines are alternately arranged at intervals in the first direction of the battery piece, each positive grid line comprises a plurality of positive segments, and the positive segments are arranged at intervals in the second direction of the battery piece; and each negative grid line comprises a plurality of negative segments, the plurality of negative segments are arranged at intervals along the second direction of the battery piece, and the first direction and the second direction are arranged in an intersecting manner. The positive electrode welding strip extends in the second direction and is electrically connected with all the positive electrode segments in the same positive electrode grid line, and the negative electrode welding strip extends in the second direction and is electrically connected with all the negative electrode segments in the same negative electrode grid line. The solar battery can effectively prevent the battery pieces from warping.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to a solar cell. Background Technology

[0002] As one of the important solutions for reducing costs and increasing efficiency in photovoltaic solar cells, the main technical solution of stacked grid cells is that the conductive structure of the cell consists of two layers. The lower layer is grid lines formed by a small amount of silver paste or other metal materials, and the upper layer is an extremely fine solder ribbon. The current collection path is cell surface → grid lines → solder ribbon. By using the "grid lines + solder ribbon" conductive structure to replace the traditional "sub-grid + main grid + solder ribbon" conductive structure, the current does not need to be conducted horizontally, but only vertically over a short distance. Therefore, the grid lines of stacked grid cells do not need the aspect ratio of traditional main and sub-grids, and only very thin grid lines are needed to form tunnels, thereby significantly reducing silver consumption.

[0003] However, for back-contact cells without front-side grid lines, when using the stacking process, the cells are prone to warping after the grid lines on the back of the cell are welded to the solder ribbon. This leads to an increased breakage rate during the lamination process, affecting the reliability of the photovoltaic module. Utility Model Content

[0004] Therefore, it is necessary to provide a solar cell that addresses the warping problem that occurs after the solar cells are welded.

[0005] This application provides a solar cell, comprising:

[0006] A battery cell has multiple positive and multiple negative grid lines on its surface. The positive and negative grid lines are alternately spaced along a first direction of the battery cell. Each positive grid line includes multiple positive segments, which are spaced along a second direction of the battery cell. Each negative grid line also includes multiple negative segments, which are spaced along the second direction. The first and second directions intersect.

[0007] A positive electrode solder strip, the positive electrode solder strip extending along the second direction, and the positive electrode solder strip electrically connecting all the positive electrode segments in the same positive electrode grid line;

[0008] The negative electrode solder strip extends along the second direction and is electrically connected to all the negative electrode segments in the same negative electrode grid line.

[0009] The technical solution will be further explained below:

[0010] In one embodiment, in the same positive grid line, there is a first interval between two adjacent positive grid segments, and the first interval in two adjacent positive grid lines is disposed opposite to each other in the first direction;

[0011] In the same negative gate line, there is a second interval between two adjacent negative segments, and the second interval in two adjacent negative gate lines is arranged opposite to each other in the first direction;

[0012] In adjacent positive electrode solder strips and negative electrode grid lines, the first interval and the second interval are staggered in the first direction.

[0013] In one embodiment, the solar cell further includes a positive electrode conductive element and a negative electrode conductive element, the positive electrode conductive element extending along the first direction, the positive electrode conductive element passing through the second interval and connecting at least two adjacent positive electrode segments along the first direction; the negative electrode conductive element extending along the first direction, the negative electrode conductive element passing through the first interval and connecting at least two adjacent positive electrode segments along the first direction.

[0014] In one embodiment, the positive electrode conductive element is connected to all the adjacent positive electrode segments in the first direction; the negative electrode conductive element is connected to all the adjacent negative electrode segments in the first direction.

[0015] In one embodiment, a first insulating element is provided between the positive conductive element and the negative solder strip; a second insulating element is provided between the negative conductive element and the positive solder strip.

[0016] In one embodiment, the length of the first insulating member in the first direction is greater than the width of the negative electrode solder strip, and the width of the first insulating member in the second direction is greater than the width of the positive electrode conductive member and less than the width of the second interval.

[0017] The length of the second insulating member in the first direction is greater than the width of the positive electrode solder strip, and the width of the second insulating member in the second direction is greater than the width of the negative electrode conductive member and less than the width of the first interval.

[0018] In one embodiment, both the first insulating element and the second insulating element are insulating adhesives.

[0019] In one embodiment, both the positive electrode conductive element and the negative electrode conductive element are conductive adhesives.

[0020] In one embodiment, the width of the positive electrode conductive element is 1 / 5 to 4 / 5 of the width of the second interval; the width of the negative electrode conductive element is 1 / 5 to 4 / 5 of the width of the first interval.

[0021] In one embodiment, the width of the first interval is 0.1mm-5mm; the width of the second interval is 0.1mm-5mm.

[0022] In the aforementioned solar cells, by configuring the positive electrode grid lines and negative electrode grid lines on the cell surface as a segmented design comprising multiple positive electrode segments, the thermal stress caused by thermal expansion and contraction of the positive and negative electrode grid lines can be reduced. This, in turn, reduces the impact of thermal stress on the cell after welding the positive electrode grid lines to the positive electrode solder ribbon and the negative electrode grid lines to the negative electrode solder ribbon, effectively preventing cell warping caused by internal thermal stress. Furthermore, by connecting all positive electrode segments within the same positive electrode grid line with positive electrode solder ribbons, the segmented design ensures that the electrical conductivity between the positive electrode segments within the positive electrode grid line is not affected. Similarly, by connecting all negative electrode segments within the same negative electrode grid line with negative electrode solder ribbons, the segmented design ensures that the electrical conductivity between the negative electrode segments within the negative electrode grid line is not affected, thereby guaranteeing the cell's power generation efficiency. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the various components are shown as examples only and not necessarily to scale. In the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the structure of a solar cell according to one embodiment.

[0027] Figure 2 This is a schematic diagram of the structure of a battery cell according to one embodiment.

[0028] Figure 3 This is a schematic diagram of the structure of a battery cell according to another embodiment.

[0029] Figure 4 This is a schematic diagram of the structure of a battery cell according to another embodiment.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10. Battery cell; 11. Positive electrode grid line; 111. Positive electrode segment; 112. First gap; 12. Negative electrode grid line; 121. Negative electrode segment; 122. Second gap; 21. Positive electrode solder strip; 22. Negative electrode solder strip; 31. Positive electrode conductive component; 32. Negative electrode conductive component; 41. First insulating component; 42. Second insulating component. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0033] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0038] As mentioned earlier, back-contact solar cells are prone to warping during the welding of the grid lines and solder strips. The inventors of this application have discovered, through inventive effort, that the main reason for this is that the silicon wafer of the solar cell 10 and the grid lines have different coefficients of thermal expansion. After welding heating and cooling, both the silicon wafer and the grid lines undergo varying degrees of thermal expansion and contraction. Under thermal stress, the entire grid line exerts a tensile force on the silicon wafer, making the solar cell prone to warping. This leads to an increased breakage rate of the solar cells during subsequent lamination processes, affecting the reliability of the finished photovoltaic module.

[0039] Based on this, one embodiment of this application provides a solar cell, specifically, see [link to embodiment]. Figure 1 One embodiment of the solar cell includes a solar cell 10, a positive electrode solder strip 21, and a negative electrode solder strip 22. The surface of the solar cell 10 is provided with multiple positive electrode grid lines 11 and multiple negative electrode grid lines 12. The multiple positive electrode grid lines 11 and multiple negative electrode grid lines 12 are alternately spaced along a first direction of the solar cell 10. Each positive electrode grid line 11 includes multiple positive electrode segments 111, which are spaced along a second direction of the solar cell 10. Each negative electrode grid line 12 includes multiple negative electrode segments 121, which are spaced along a second direction. The first direction and the second direction intersect. For example, as shown... Figure 1 As shown, arrow S1 points in the first direction, and arrow S2 points in the second direction. The first and second directions are set perpendicular to each other.

[0040] Furthermore, the positive electrode solder strip 21 extends along the second direction and electrically connects all positive electrode segments 111 of the same positive electrode grid line 11. The negative electrode solder strip 22 extends along the second direction and electrically connects all negative electrode segments 121 of the same negative electrode grid line 12. Both the positive electrode solder strip 21 and the negative electrode solder strip 22 are used for electrical interconnection between the battery cells 10. Understandably, the number of positive electrode solder strips 21 is equal to the number of positive electrode grid lines 11, and each positive electrode solder strip 21 is connected one-to-one to the positive electrode segments 111 of each positive electrode grid line 11; similarly, the number of negative electrode solder strips 22 is equal to the number of negative electrode grid lines 12, and each negative electrode solder strip 22 is connected one-to-one to the negative electrode segments 121 of each negative electrode grid line 12.

[0041] In the aforementioned solar cell, by configuring the positive grid lines 11 on the surface of the cell 10 as a segmented design including multiple positive segments 111, and configuring the negative grid lines 12 as a segmented design including multiple negative segments 121, the thermal stress caused by the thermal expansion and contraction of the positive grid lines 11 and negative grid lines 12 can be reduced. This reduces the impact of thermal stress on the cell 10 after the positive grid lines 11 are welded to the positive electrode solder ribbon 21 and after the negative grid lines 12 are welded to the negative electrode solder ribbon 22. This effectively prevents cell warping caused by internal thermal stress in the cell 10. Furthermore, by connecting all the positive segments 111 of the same positive grid line 11 with the positive electrode solder ribbon 21, it is ensured that the segmented design does not affect the electrical conduction between the positive segments 111 in the positive grid line 11. Similarly, by connecting all negative electrode segments 121 in the same negative electrode grid line 12 with negative and positive electrode solder strips 21, the segmented design is ensured to not affect the electrical conduction between each negative electrode segment 121 in the negative electrode grid line 12, thereby ensuring the power generation efficiency of the solar cell 10.

[0042] See Figure 2 In one embodiment, within the same positive electrode grid line 11, a first interval 112 is provided between two adjacent positive electrode segments 111, and the first interval 112 in two adjacent positive electrode grid lines 11 are arranged opposite to each other in a first direction. Similarly, within the same negative electrode grid line 12, a second interval 122 is provided between two adjacent negative electrode segments 121, and the second interval 122 in two adjacent negative electrode grid lines 12 are arranged opposite to each other in a first direction. Further, in adjacent positive electrode solder strips 21 and negative electrode grid lines 12, the first interval 112 and the second interval 122 are staggered in the first direction. In short, the positive electrode segments 111 and negative electrode segments 121 are arranged asymmetrically and staggered in the first direction, which makes the thermal stress distribution on the battery cell 10 more uniform and further avoids the battery cell 10 from warping due to thermal stress. Meanwhile, the staggered arrangement of the first interval 112 and the second interval 122 also facilitates the subsequent connection of the positive electrode conductive element 31 to the adjacent positive electrode segment 111 through the second interval 122, and the connection of the negative electrode conductive element 32 to the adjacent negative electrode segment 121 through the first interval 121.

[0043] Optionally, in one embodiment, the width of the first interval 112 is 0.1mm-5mm, for example, it can be 0.1mm, 0.5mm, 1mm, 2mm, 3mm, 4mm, or 5mm. Similarly, the width of the second interval 122 is 0.1mm-5mm, for example, it can be 0.1mm, 0.5mm, 1mm, 2mm, 3mm, 4mm, or 5mm. Specifically, if the widths of the first interval 112 and the second interval 122 are too large, it will affect the current collected by the positive gate line 11 and the negative gate line 12, and easily cause current loss. If the widths of the first interval 112 and the second interval 122 are too small, the effect of reducing the thermal stress of the positive gate line 11 and the negative gate line 12 will not be significant, and it will be detrimental to the subsequent passage of the positive conductive element 31 and the negative conductive element 32. By configuring the width of the first interval 112 and the width of the second interval 122 to be 0.1mm-5mm, the anti-warping effect of the battery cell 10 is ensured while preventing current loss.

[0044] Specifically, see Figure 3 In one embodiment, the solar cell further includes a positive electrode conductive element 31, which extends along a first direction, passes through a second interval 122, and connects to at least two adjacent positive electrode segments 111 along the first direction. Thus, when a poor contact problem occurs between a positive electrode segment 111 and the positive electrode solder strip 21, such as a cold solder joint or detachment, the current collected in that positive electrode segment 111 can be transferred through the positive electrode conductive element 31 to the adjacent positive electrode segment 111, and further to the positive electrode solder strip 21 connected to the adjacent positive electrode segment 111, avoiding current loss.

[0045] Preferably, in one embodiment, the positive electrode conductive element 31 is connected to all adjacent positive electrode segments 111 in the first direction. In this way, when a positive electrode segment 111 and its adjacent positive electrode segments both have poor contact problems such as poor soldering or desoldering with the corresponding solder strip, the current collected by these two positive electrode segments 111 can be transmitted to the more distant positive electrode segments 111 through the positive electrode conductive element 31, further avoiding the problem of current loss.

[0046] Furthermore, the number of positive electrode conductive elements 31 is the same as the number of positive electrode segments 111 on each positive electrode solder strip 21. In this way, each positive electrode segment 111 can be connected to other positive electrode segments 111 adjacent to it in the first direction through the corresponding positive electrode conductive element 31, which further avoids the problem of current loss and ensures the power generation efficiency of the solar cell.

[0047] For example, in one embodiment, the positive electrode conductive element 31 can be a conductive adhesive. Specifically, before welding the positive electrode grid line 11 to the positive electrode solder strip 21, conductive adhesive is first applied to the battery cell 10 along a first direction, allowing the conductive adhesive to pass through the second interval 122 and connect at least two adjacent positive electrode segments 111 along the first direction. Then, the conductive adhesive is cured to form the positive electrode conductive element 31. This process is simple and has low manufacturing cost. Understandably, in other embodiments, the positive electrode conductive element 31 can also be made of other metal materials.

[0048] Optionally, in one embodiment, the width of the positive electrode conductive element 31 is 1 / 5 to 4 / 5 of the width of the second interval 122. For example, the width of the positive electrode conductive element 31 can be 1 / 5, 2 / 5, 3 / 5, or 4 / 5 of the width of the second interval 122. Specifically, if the width of the positive electrode conductive element 31 is too large, it is easy to contact the negative electrode segment 121, leading to a short circuit. If the width of the positive electrode conductive element 31 is too small, the current conductivity is poor, affecting current transmission. By configuring the width of the positive electrode conductive element 31 to be 1 / 5 to 4 / 5 of the width of the second interval 122, short circuits are avoided while ensuring that the positive electrode conductive element 31 has good current conductivity.

[0049] Specifically, see Figure 3 In one embodiment, the solar cell further includes a negative electrode conductive element 32, which extends along a first direction, passes through a first interval 112, and connects at least two adjacent negative electrode segments 121 along the first direction. Thus, when a negative electrode segment 121 experiences poor contact such as a cold solder joint or detachment from the negative electrode solder strip 22, the current collected in that negative electrode segment 121 can be transferred through the negative electrode conductive element 32 to the adjacent negative electrode segment 121, and further to the negative electrode solder strip 22 connected to the adjacent negative electrode segment 121, avoiding current loss. Preferably, in one embodiment, the negative electrode conductive element 32 is connected to all adjacent negative electrode segments 121 in the first direction. In this way, when a negative electrode segment 121 and its adjacent negative electrode segments 121 have poor contact problems such as poor soldering or desoldering with the corresponding solder strip, the current collected by these two negative electrode segments 121 can be transmitted to the more distant negative electrode segments 121 through the negative electrode conductive element 32, further avoiding the problem of current loss.

[0050] Furthermore, the number of negative electrode conductive elements 32 is the same as the number of negative electrode segments 121 on each negative electrode solder strip 22. In this way, each negative electrode segment 121 can be connected to other adjacent negative electrode segments 121 in the first direction through the corresponding negative electrode conductive element 32, which further avoids the problem of current loss and ensures the power generation efficiency of the solar cell.

[0051] For example, in one embodiment, the negative electrode conductive element 32 can be a conductive adhesive; specifically, see [link to relevant documentation]. Figure 4Before welding the negative electrode grid line 12 to the negative electrode solder strip 22, conductive adhesive is first coated on the battery cell 10 along the first direction, allowing the conductive adhesive to pass through the first interval 112 and connect at least two adjacent negative electrode segments 121 along the first direction. Then, the conductive adhesive is cured to form the negative electrode conductive component 32. This process is simple and has low manufacturing cost. Understandably, in other embodiments, the negative electrode conductive component 32 can also be made of other metal materials.

[0052] Optionally, in one embodiment, the width of the negative electrode conductive element 32 is 1 / 5 to 4 / 5 of the width of the first interval 112. For example, the width of the negative electrode conductive element 321 can be 1 / 5, 2 / 5, 3 / 5, or 4 / 5 of the width of the first interval 112. Specifically, if the width of the negative electrode conductive element 32 is too large, it is easy to contact the positive electrode segment 111, leading to a short circuit. If the width of the negative electrode conductive element 32 is too small, the current conductivity is poor, affecting current transmission. By configuring the width of the negative electrode conductive element 32 to be 1 / 5 to 4 / 5 of the width of the first interval 112, short circuits are avoided while ensuring that the negative electrode conductive element 32 has good current conductivity.

[0053] See Figure 1 as well as Figure 4 A first insulating element 41 is provided between the positive conductive element 31 and the negative solder strip 22. The first insulating element 41 is used to isolate the positive conductive element 31 and the negative solder strip 22, thereby preventing a short circuit between the positive conductive element 31 and the negative solder strip 22.

[0054] Optionally, in one embodiment, the first insulating element 41 can be an insulating adhesive. Specifically, after the positive electrode conductive element 31 is formed on the battery cell 10, insulating adhesive can be applied to the portion of the positive electrode conductive element 31 located within the second interval 122. Once the insulating adhesive has cured, the first insulating element 41 is formed. Then, the negative electrode solder strip 22 is connected to the negative electrode grid line 12. At this point, the intersection of the negative electrode solder strip 22 and the positive electrode conductive element 31 (i.e., the position of the second interval 122) is separated by the first insulating element 41. Understandably, in another embodiment, the first insulating element 41 can also be made of other insulating materials.

[0055] Optionally, in one embodiment, the length of the first insulating member 41 in the first direction is greater than the width of the negative electrode solder strip 22, thus ensuring that the first insulating member 41 can completely isolate the positive electrode conductive member 31 from the negative electrode solder strip 22. The width of the first insulating member 41 in the second direction is greater than the width of the positive electrode conductive member 31 and less than the width of the second interval 122; thus ensuring that the first insulating member 41 can cover the positive electrode conductive member 31 and not contact the negative electrode segment 121, preventing the positive electrode conductive member 31 from contacting the negative electrode segment 121 and short-circuiting.

[0056] See Figure 1In one embodiment, a second insulating member 42 is provided between the negative conductive member 32 and the positive solder strip 21; the second insulating member 42 is used to isolate the negative conductive member 32 from the positive solder strip 21, thereby preventing a short circuit between the negative conductive member 32 and the positive solder strip 21.

[0057] Optionally, in one embodiment, the second insulating member 42 may be insulating adhesive. Specifically, see [link to documentation]. Figure 4 After the negative electrode conductive element 32 is formed on the battery cell 10, insulating adhesive can be applied to the portion of the negative electrode conductive element 32 located within the first interval 112. Once the insulating adhesive has cured, a second insulating element 42 is formed. Then, the positive electrode solder strip 21 is connected to the positive electrode grid line 11. At this point, the intersection of the positive electrode solder strip 21 and the negative electrode conductive element 32 (i.e., the position of the first interval 112) is separated by the second insulating element 42. Understandably, in another embodiment, the second insulating element 42 can also be made of other insulating materials.

[0058] Optionally, in one embodiment, the length of the second insulating member 42 in the first direction is greater than the width of the positive electrode solder strip 21, thus ensuring that the second insulating member 42 can completely isolate the negative electrode conductive member 32 from the positive electrode solder strip 21. The width of the second insulating member 42 in the second direction is greater than the width of the negative electrode conductive member 32 and less than the width of the first gap 112; thus ensuring that the second insulating member 42 can cover the negative electrode conductive member 32 and not contact the positive electrode segment 111, preventing the negative electrode conductive member 32 from contacting the positive electrode segment 111 and short-circuiting.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A solar cell, characterized by, The solar cell comprises: a battery piece (10) provided with a plurality of positive grid lines (11) and a plurality of negative grid lines (12) on the surface, the plurality of positive grid lines (11) and the plurality of negative grid lines (12) are alternately and spaced apart along a first direction of the battery piece (10), each of the positive grid lines (11) comprises a plurality of positive segments (111) which are spaced apart along a second direction of the battery piece (10); each of the negative grid lines (12) comprises a plurality of negative segments (121) which are spaced apart along the second direction, wherein the first direction and the second direction are arranged at right angles; a positive solder strip (21) extending along the second direction, and the positive solder strip (21) is electrically connected to all the positive segments (111) in the same positive grid line (11); a negative solder strip (22) extending along the second direction, and the negative solder strip (22) is electrically connected to all the negative segments (121) in the same negative grid line (12).

2. The solar cell according to claim 1, wherein: in the same positive grid line (11), two adjacent positive segments (111) have a first interval (112), and the first intervals (112) in two adjacent positive grid lines (11) are arranged opposite to each other in the first direction; in the same negative grid line (12), two adjacent negative segments (121) have a second interval (122), and the second intervals (122) in two adjacent negative grid lines (12) are arranged opposite to each other in the first direction; in the adjacent positive solder strip (21) and the negative grid line (12), the first interval (112) and the second interval (122) are arranged staggered in the first direction.

3. The solar cell according to claim 2, characterized in that, The solar cell further comprises a positive conductive member (31) and a negative conductive member (32), the positive conductive member (31) extends along the first direction, the positive conductive member (31) passes through the second interval (122) and connects at least two positive segments (111) adjacent in the first direction; the negative conductive member (32) extends along the first direction, the negative conductive member (32) passes through the first interval (112) and connects at least two positive segments (111) adjacent in the first direction.

4. The solar cell according to claim 3, characterized in that, The positive conductive member (31) is connected to all the positive segments (111) adjacent in the first direction; the negative conductive member (32) is connected to all the negative segments (121) adjacent in the first direction.

5. The solar cell according to claim 3, characterized in that, A first insulating member (41) is arranged between the positive conductive member (31) and the negative solder strip (22); a second insulating member (42) is arranged between the negative conductive member (32) and the positive solder strip (21).

6. The solar cell according to claim 5, characterized in that, The length of the first insulating member (41) in the first direction is greater than the width of the negative welding strip (22), and the width of the first insulating member (41) in the second direction is greater than the width of the positive conductive member (31) and less than the width of the second interval (122); The length of the second insulating member (42) in the first direction is greater than the width of the positive welding strip (21), and the width of the second insulating member (42) in the second direction is greater than the width of the negative conductive member (32) and less than the width of the first interval (112).

7. The solar cell according to claim 5, characterized in that, The first insulating member (41) and the second insulating member (42) are both insulating glue.

8. The solar cell according to claim 3, characterized in that, The positive conductive member (31) and the negative conductive member (32) are both conductive glue.

9. The solar cell according to claim 3, characterized in that, The width of the positive conductive member (31) is 1 / 5-4 / 5 of the width of the second interval (122); the width of the negative conductive member (32) is 1 / 5-4 / 5 of the width of the first interval (112).

10. The solar cell according to claim 2, characterized in that, The width of the first interval (112) is 0.1mm-5mm; the width of the second interval (122) is 0.1mm-5mm.

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