Battery piece and photovoltaic module

Abstract

The invention discloses a battery piece and a photovoltaic module. The battery piece comprises a battery piece body. A plurality of auxiliary grid lines and a plurality of connecting grid lines are arranged on the battery piece body, the plurality of connecting grid lines extend along a first direction, the plurality of connecting grid lines comprise a plurality of first connecting grid lines and a plurality of second connecting grid lines, the first connecting grid lines are continuous grid lines, the first connecting grid lines are electrically connected with the plurality of auxiliary grid lines, and the second connecting grid lines are electrically connected with the plurality of second connecting grid lines. The second connecting grid line is a discontinuous grid line and / or a continuous grid line, and the second connecting grid line comprises a first grid line segment. Therefore, collection and transmission of current on the surface of the battery piece body are facilitated, and it is ensured that current on the auxiliary grid lines can be smoothly transmitted to the connecting grid lines. The second connecting grid lines are discontinuously or continuously arranged, so that the slurry consumption during grid line printing can be effectively reduced, the production cost of the battery piece can be reduced, or the processing difficulty can be reduced, and when the current collection of part of the auxiliary grid lines is abnormal, the collection of the current on part of normal auxiliary grid lines can be realized through the second connecting grid lines, and the reliability of the battery piece can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic modules, and in particular to a battery cell and a photovoltaic module. Background Art

[0002] In the prior art, the battery cell consumes a large amount of silver paste and has a high production cost. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the first object of the present invention is to provide a battery cell that can reduce production costs.

[0004] The second objective of the present invention is to provide a photovoltaic module, comprising the solar cell described in the above embodiment.

[0005] According to the first aspect of the present invention, the battery cell embodiment comprises: a battery cell body, on which a plurality of auxiliary grid lines and a plurality of connecting grid lines are arranged, the plurality of connecting grid lines extend along a first direction and are arranged at intervals along a second direction, the plurality of auxiliary grid lines extend along the second direction, the plurality of connecting grid lines include a plurality of first connecting grid lines and a plurality of second connecting grid lines, the first connecting grid lines are continuous grid lines, the plurality of first connecting grid lines are arranged at an edge area of ​​the battery cell body along the second direction, the first connecting grid lines are electrically connected to the plurality of auxiliary grid lines, the plurality of second connecting grid lines are arranged at a middle area of ​​the battery cell body, the second connecting grid lines are discontinuous grid lines and / or continuous grid lines, the second connecting grid lines include a first grid line segment, and the first grid line segment is arranged adjacent to the edge area of ​​the battery cell body along the first direction.

[0006] According to the battery cell of the embodiment of the present invention, the arrangement of multiple secondary grid lines and multiple connecting grid lines on the surface of the battery cell body facilitates the collection and transmission of current on the surface of the battery cell body. The first connecting grid line serves as a current collection path in the edge area of ​​the battery cell body. The first connecting grid line is electrically connected to multiple secondary grid lines to ensure that the current on the secondary grid lines can be smoothly transmitted to the connecting grid lines, prevent the EL at the edge of the battery cell from turning black after the reliability test, and ensure the collection of current. The second connecting grid line serves as a current collection path in the middle area of ​​the battery cell body. When the second connecting grid line is intermittently set, the amount of slurry used in grid line printing can be effectively reduced, and the production cost of the battery cell can be reduced. When the second connecting grid line is continuously set, the processing difficulty can be reduced. The setting of the first grid line segment can facilitate the collection of current in the edge area of ​​the battery cell body along the first direction. When the current collection of some secondary grid lines is abnormal, the second connecting grid line is used to collect the current on some normal secondary grid lines, thereby improving the reliability of the battery cell.

[0007] In some embodiments, the battery cell also includes: multiple first gate line connecting lines, multiple first gate line connecting lines are respectively arranged at the intersection of the connecting gate line and the auxiliary gate line, or multiple first gate line connecting lines are respectively arranged at the intersection of the connecting gate line and the extension line of the auxiliary gate line, multiple first gate line connecting lines are electrically connected to the connecting gate line, and the connecting gate line is electrically connected to at least two of the auxiliary gate lines through the first gate line connecting lines along a first direction.

[0008] In some embodiments, the first gate line connecting line includes: a first gate line, the first gate line extends along the second direction, at least a portion of the first gate line overlaps the secondary gate line, and at least a portion of the first gate line has a width along the first direction greater than or equal to a width of the secondary gate line along the first direction.

[0009] In some embodiments, the projection of the first grid line on the battery cell body is in the shape of a rhombus or a rectangle.

[0010] In some embodiments, the first gate line connecting line further includes: a second gate line, the second gate line is arranged at both ends of the first gate line along the second direction, the second gate line extends along the first direction, and the width of the second gate line along the first direction is greater than or equal to the width of the first gate line along the first direction.

[0011] In some embodiments, the length of the second gate line in the first direction is L1, and L1 satisfies: 0.11mm≤L1≤0.21mm; and / or, the overlapping length of the first gate line and the auxiliary gate line is L2, and L2 satisfies: 0.065mm≤L2≤0.165mm.

[0012] In some embodiments, the second connecting gate line further includes: a plurality of second gate line segments, the plurality of second gate line segments are arranged between the plurality of first gate line segments along the first direction, and the length of the second gate line segment along the first direction is less than or equal to the length of the first gate line segment along the first direction.

[0013] In some embodiments, a plurality of the second gate line segments are staggered along the second direction.

[0014] In some embodiments, a plurality of the first gate line segments and a plurality of the second gate line segments are sequentially connected along the first direction; and / or a plurality of the first gate line segments and a plurality of the second gate line segments are spaced apart along the first direction.

[0015] In some embodiments, multiple second connecting grid lines are arranged at intervals along the second direction, and multiple second connecting grid lines are arranged opposite to multiple first grid line connecting lines along the thickness direction of the battery cell body, multiple first grid line connecting lines are arranged between two adjacent second connecting grid lines, and multiple first grid line connecting lines are arranged at intervals along the first direction.

[0016] In some embodiments, the secondary gate line includes multiple secondary gate line segments, and the multiple secondary gate line segments are arranged at intervals along the second direction. Two adjacent secondary gate line segments along the second direction define openings, and the multiple openings are opposite to each other along the first direction. The first gate line connecting line is arranged at the opening, and the two ends of the first gate line connecting line along the second direction are respectively electrically connected to the adjacent secondary gate line segments.

[0017] In some embodiments, the cell further includes: a plurality of second grid line connection lines, the plurality of second grid line connection lines are arranged adjacent to the edge of the cell along the first direction, and the second grid line connection lines are connected to at least two of the secondary grid lines adjacent to the edge of the cell.

[0018] In some embodiments, along the first direction, the secondary gate line adjacent to the edge of the battery cell includes multiple secondary gate line segments, and the second gate line connecting line includes: a third gate line and a fourth gate line, the third gate line and the fourth gate line are arranged at intervals along the second direction, and one end of the third gate line and the fourth gate line adjacent to the edge of the battery cell are respectively connected to one end of two adjacent secondary gate line segments adjacent to each other.

[0019] A photovoltaic module according to an embodiment of a second aspect of the present invention comprises a cell and a plurality of welding strips, wherein the cell comprises a cell body, wherein the cell body is provided with a plurality of auxiliary grid lines and a plurality of connecting grid lines, wherein the plurality of connecting grid lines extend along a first direction and are arranged at intervals along a second direction, wherein the plurality of auxiliary grid lines extend along the second direction, wherein the plurality of connecting grid lines comprise a plurality of first connecting grid lines and a plurality of second connecting grid lines, wherein the first connecting grid lines are continuous grid lines, wherein the plurality of first connecting grid lines are arranged at an edge region of the cell body along the second direction, wherein the first connecting grid lines are electrically connected to the plurality of auxiliary grid lines, wherein the plurality of second connecting grid lines are arranged at a middle region of the cell body, wherein the second connecting grid lines are discontinuous grid lines and / or continuous grid lines, wherein the second connecting grid lines comprise a first grid line segment, wherein the first grid line segment is arranged adjacent to an edge region of the cell body along the first direction; wherein a portion of the plurality of welding strips are arranged on the first connecting grid lines, and another portion of the plurality of welding strips are arranged on the plurality of first grid line segments, wherein the another portion of the plurality of welding strips are electrically connected to the first grid line segments at corresponding ends along the first direction.

[0020] In some embodiments, the photovoltaic module further includes: a plurality of glue dots, wherein the plurality of glue dots respectively cover the soldering ribbon on a side of the soldering ribbon away from the connecting grid line.

[0021] In some embodiments, the glue spots provided on two adjacent solder strips on the same side of the battery cell along the thickness direction of the battery cell are staggered along the second direction; and / or, the glue spots provided on two solder strips relatively arranged along the thickness direction of the battery cell are staggered along the thickness direction of the battery cell.

[0022] In some embodiments, the plurality of glue dots include: a plurality of first glue dots, and the plurality of first glue dots are arranged adjacent to an edge of the battery cell along the first direction.

[0023] In some embodiments, the plurality of glue dots include: a plurality of second glue dots, wherein the plurality of second glue dots are arranged between the plurality of first glue dots along the first direction, and along the first direction, the spacing between adjacent first glue dots and second glue dots is less than or equal to the spacing between two adjacent second glue dots.

[0024] In some embodiments, the sum of the projected areas of the plurality of glue dots on the battery cell is S1, the area of ​​the battery cell is S2, and S1 and S2 satisfy: 0.1%≤S1 / S2≤0.76%.

[0025] In some embodiments, the distance between the glue point and the battery cell is H1, the distance between the welding strip and the battery cell is H2, and H1 and H2 satisfy: 10 μm≤H1-H2≤100 μm.

[0026] In some embodiments, the photovoltaic assembly further includes: a plurality of solder pads, the plurality of solder pads being arranged adjacent to the edge of the battery cell along the first direction, the solder pads being arranged between two of the glue points adjacent to the edge of the battery cell along the first direction.

[0027] In some embodiments, the pad is disposed between a third grid line and a fourth grid line of the battery cell, and the pad is spaced apart from the third grid line and the fourth grid line.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a schematic diagram of a battery cell according to an embodiment of the present invention; Figure 2 yes Figure 1 Enlarged schematic diagram of the middle P region; Figure 3 yes Figure 2 A magnified schematic diagram of the P1 region in the middle; Figure 4 A schematic diagram of a battery cell according to an embodiment of the present invention in which no second gate line segment is arranged between two first connecting gate lines adjacent to the edge of the battery cell; Figure 5 yes Figure 4 Enlarged schematic diagram of the middle M region; Figure 6 is a schematic diagram of a battery cell according to an embodiment of the present invention in which no second gate line segment is provided between two adjacent second connecting gate lines and the second connecting gate lines are discontinuous gate lines; Figure 7 yes Figure 6 Enlarged schematic diagram of the middle N region; Figure 8 is a schematic diagram of a photovoltaic assembly according to an embodiment of the present invention; Fig. 9 yes Figure 8 Enlarged schematic diagram of the middle R region; Fig.10 is a schematic cross-sectional view at a glue point according to an embodiment of the present invention; Fig.11 is a schematic diagram of a battery cell according to an embodiment of the present invention in which no second gate line segment is provided between two adjacent second connection gate lines and the second connection gate lines are continuous gate lines; Fig.12 yes Fig.11 Enlarged schematic diagram of the middle S region.

[0030] Reference numerals: 1. Photovoltaic modules; 100. Battery cell; 10. Cell body; 11. Connecting grid line; 12. First connecting grid line; 13. Second connecting grid line; 132. First grid line segment; 133. Second grid line segment; 14. Secondary grid line; 15. Secondary grid line segment; 16. First grid line connecting line; 17. First grid line; 18. Second grid line; 19. Pad; 20. Solder strip; 21. Glue point; 22. First glue point; 23. Second glue point; 30. Second grid line connection line; 31. Third grid line; 32. Fourth grid line; A, first direction; B, second direction; C, thickness direction. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 12 A battery cell 100 according to an embodiment of the present invention is described, comprising: a battery cell body 10 , wherein the battery cell body 10 has a first direction A, a second direction B and a thickness direction C.

[0032] Specifically, if Figure 1-Figure 12 As shown, a plurality of auxiliary grid lines 14 and a plurality of connecting grid lines 11 are provided on the battery cell body 10, the plurality of connecting grid lines 11 extend along a first direction A and are arranged at intervals along a second direction B, the plurality of auxiliary grid lines 14 extend along the second direction B, the plurality of connecting grid lines 11 include a plurality of first connecting grid lines 12 and a plurality of second connecting grid lines 13, the first connecting grid lines 12 are continuous grid lines, the plurality of first connecting grid lines 12 are arranged at the edge area of ​​the battery cell body 10 along the second direction B, the first connecting grid lines 12 are electrically connected to the plurality of auxiliary grid lines 14, the plurality of second connecting grid lines 13 are arranged at the middle area of ​​the battery cell body 10, the second connecting grid lines 13 are discontinuous grid lines or continuous grid lines, the second connecting grid lines 13 include a first grid line segment 132, and the first grid line segment 132 is arranged along the first direction A adjacent to the edge area of ​​the battery cell body 10.

[0033] Combination Figure 1-Figure 12 , the connecting grid lines 11 are arranged orthogonally to the auxiliary grid lines 14, the extending direction of the connecting grid lines 11 is the same as the arrangement direction of the battery cell 100, and the connecting grid lines 11 are electrically connected to the auxiliary grid lines 14. The multiple connecting grid lines 11 include two first connecting grid lines 12, and the two first connecting grid lines 12 are respectively arranged at the edge areas of the battery cell body 10 on both sides along the second direction B. The first connecting grid lines 12 can collect the current of the edge areas of the battery cell body 10, and the multiple second connecting grid lines 13 are arranged at intervals in the middle area of ​​the battery cell body 10 along the second direction B, and the second connecting grid lines 13 can be arranged discontinuously along the first direction A. Optionally, the second connecting grid lines 13 can also be arranged continuously along the first direction A. The second connecting grid line 13 can collect the current in the middle area of ​​the battery cell body 10. A second connecting grid line 13 includes two first grid line segments 132. The two first grid line segments 132 extend along the first direction A and are respectively arranged adjacent to the two side edges of the battery cell body 10 along the first direction A, and are connected to more than two auxiliary grid lines 14 adjacent to the edges of the battery cell body 10.

[0034] Optionally, a portion of the plurality of second connection gate lines 13 are discontinuous gate lines, and another portion of the plurality of second connection gate lines 13 are continuous gate lines.

[0035] In the battery cell 100 according to the embodiment of the present invention, the arrangement of multiple auxiliary grid lines 14 and multiple connecting grid lines 11 on the surface of the battery cell body 10 facilitates the collection and transmission of current on the surface of the battery cell body 10. The first connecting grid line 12 serves as a current collection path in the edge area of ​​the battery cell body 10. The first connecting grid line 12 is electrically connected to the multiple auxiliary grid lines 14 to ensure that the current on the auxiliary grid lines 14 can be smoothly transmitted to the connecting grid lines 11, thereby preventing the EL at the edge of the battery cell 100 from blackening after the reliability test and ensuring the collection of current. The second connecting gate line 13 serves as a current collection path in the middle area of ​​the battery cell body 10. When the second connecting gate line 13 is intermittently set, the amount of slurry used during gate line printing can be effectively reduced, thereby reducing the production cost of the battery cell 100. When the second connecting gate line 13 is continuously set, the processing difficulty can be reduced. The setting of the first gate line segment 132 can facilitate the collection of current in the edge area of ​​the battery cell body 10 along the first direction A. When the current collection of some auxiliary gate lines 14 is abnormal, the current on some normal auxiliary gate lines 14 can be collected through the second connecting gate line 13, thereby improving the reliability of the battery cell 100.

[0036] According to some embodiments of the present invention, Figure 2 and Figure 3 As shown, the cell 100 further includes a plurality of first grid line connection lines 16, which are respectively arranged at the intersection of the connecting grid line 11 and the secondary grid line 14, or the plurality of first grid line connection lines 16 are respectively arranged at the intersection of the connecting grid line 11 and the extension line of the secondary grid line 14. It can be understood that for a continuous secondary grid line 14, the first grid line connection line 16 is arranged at the intersection of the connecting grid line 11 and the secondary grid line 14, and for an intermittent secondary grid line 14, the first grid line connection line 16 is arranged at the intersection of the connecting grid line 11 and the extension line of the secondary grid line 14. The present application is applicable to the cell 100 in which the secondary grid line 14 is intermittently arranged or continuously arranged. The plurality of first grid line connection lines 16 are electrically connected to the connecting grid line 11, and the connecting grid line 11 is electrically connected to at least two secondary grid lines 14 along the first direction A through the first grid line connection lines 16.

[0037] A first gate line connection line 16 is provided at the connection between the connecting gate line 11 and the auxiliary gate line 14. The first gate line connection line 16 extends along the second direction B. The length of the first gate line connection line 16 in the second direction B is greater than the width of the connecting gate line 11 in the second direction B. The first gate line connection line 16 is electrically connected to the connecting gate line 11 and the auxiliary gate line 14 respectively. When the connecting gate line 11 is connected to the welding strip 20, the setting of the first gate line connection line 16 can increase the contact area between the welding strip 20 and the connecting gate line 11.

[0038] Therefore, by setting up multiple first gate line connecting lines 16, the connection strength between the auxiliary gate line 14 and the connecting gate line 11 can be improved, and the reliability of the connection between the auxiliary gate line 14 and the connecting gate line 11 can be improved. At the same time, when the welding strip 20 is connected to the connecting gate line 11, the first gate line connecting line 16 can play an anti-deviating role, thereby improving the stability and reliability of the battery cell 100.

[0039] According to some embodiments of the present invention, Figure 3 As shown, the first gate line connection line 16 includes: a first gate line 17, the first gate line 17 extends along the second direction B, at least a portion of the first gate line 17 overlaps the auxiliary gate line 14, and the width of at least a portion of the first gate line 17 along the first direction A is greater than or equal to the width of the auxiliary gate line 14 along the first direction A.

[0040] During the printing process, the first grid line connection line 16, the connection grid line 11 and the secondary grid line 14 are simultaneously printed on one side surface of the battery cell body 10. At least part of the first grid line 17 overlaps with the secondary grid line 14, that is, at least part of the first grid line 17 overlaps with the secondary grid line 14. The width of at least part of the first grid line 17 along the first direction A is greater than or equal to the width of the secondary grid line 14 along the first direction A, ensuring that the first grid line 17 has a sufficient area to be welded with the welding strip 20.

[0041] Therefore, the design of at least part of the first gate line 17 overlapping the auxiliary gate line 14 can prevent lateral displacement of the welding strip 20 during welding. The width of at least part of the first gate line 17 is greater than or equal to the width of the auxiliary gate line 14, which can increase the contact area between the first gate line 17 and the welding strip 20, ensure the electrical connection between the welding strip 20 and the first gate line 17, and also facilitate reducing the difficulty of welding.

[0042] According to some embodiments of the present invention, Figure 3 As shown, the projection of the first grid line 17 on the battery cell body 10 is in the shape of a rhombus or a rectangle.

[0043] The first grid line 17 is designed in a diamond shape, which has the main advantage of saving slurry. The size of the first grid line 17 at the middle position in the second direction B is increased, which is more conducive to the welding between the first grid line 17 and the welding strip 20. The first grid line 17 is a rectangle, which can play an anti-drift role under the premise of ensuring the printing quality of the first grid line 17. Therefore, the projection shape of the first grid line 17 on the battery cell body 10 is a diamond or a rectangle. The design of the diamond and rectangle can reduce unnecessary material use while ensuring the welding quality, reduce the production cost of the battery cell 100, and improve the reliability of the battery cell 100.

[0044] According to some embodiments of the present invention, Figure 3As shown, the first gate line connection line 16 also includes: a second gate line 18, which is arranged at both ends of the first gate line 17 along the second direction B, and the second gate line 18 extends along the first direction A. The width of the second gate line 18 along the first direction A is greater than or equal to the width of the first gate line 17 along the first direction A.

[0045] The second gate line 18 extends along the first direction A. One first gate line connection line 16 may include two second gate lines 18. The two second gate lines 18 are spaced apart at both ends of the first gate line 17 along the second direction B. The second gate line 18 and the first gate line 17 are in an "I" shape. The width of the second gate line 18 in the first direction A is greater than or equal to the width of the first gate line 17 in the first direction A.

[0046] Therefore, the second gate line 18 can enhance the anti-deviation effect of the first gate line connection line 16 , ensure the electrical connection between the welding strip 20 and the first gate line connection line 16 , and further ensure the current collection effect of the battery cell 100 , thereby improving the photoelectric conversion efficiency of the battery cell 100 .

[0047] According to some embodiments of the present invention, the length of the second gate line 18 in the first direction A is L1, and L1 satisfies: 0.11 mm≤L1≤0.21 mm.

[0048] If the length of the second grid line 18 in the first direction A is less than 0.11 mm, the second grid line 18 is too thin, resulting in a small contact area between the second grid line 18 and the soldering strip 20, which is not conducive to ensuring a reliable electrical connection between the first grid line connecting line 16 and the soldering strip 20; if the length of the second grid line 18 in the first direction A is greater than 0.21 mm, the second grid line 18 is too wide, resulting in excessive material for the second grid line 18, which is not conducive to reducing the production cost of the battery cell 100. For example, L1=0.2 mm.

[0049] Optionally, the overlapping length of the first gate line 17 and the secondary gate line 14 is L2, and L2 satisfies: 0.065 mm≤L2≤0.165 mm.

[0050] If the overlapping length of the first grid line 17 and the secondary grid line 14 is less than 0.065 mm, the overlapping length of the first grid line 17 and the secondary grid line 14 is too small, resulting in an increase in the difficulty of printing the first grid line connecting line 16 and the secondary grid line 14, and the connection reliability between the first grid line connecting line 16 and the secondary grid line 14 is poor, which is not conducive to current transmission; if the overlapping length of the first grid line 17 and the secondary grid line 14 is greater than 0.165 mm, the overlapping length of the first grid line 17 and the secondary grid line 14 is too large, resulting in excessive material for the first grid line 17, which is not conducive to reducing production costs. For example, L2=0.1 mm.

[0051] Optionally, L1 satisfies: 0.11 mm ≤ L1 ≤ 0.21 mm, and L2 satisfies: 0.065 mm ≤ L2 ≤ 0.165 mm.

[0052] Thus, by limiting the length range of the second gate line 18 in the second direction B, or limiting the overlapping length range of the first gate line 17 and the auxiliary gate line 14, or limiting the length range of the second gate line 18 in the second direction B and the overlapping length range of the first gate line 17 and the auxiliary gate line 14, the amount of slurry used for the first gate line connecting line 16 can be saved while ensuring the anti-deviating effect of the first gate line connecting line 16, thereby reducing the production cost of the battery cell 100.

[0053] In this embodiment, the connecting grid lines 11 can be disposed on both the front side (ie, the light-exposed side) and the back side (ie, the non-light-exposed side) of the cell 100 .

[0054] According to some embodiments of the present invention, Figure 2 As shown, the second connecting gate line 13 further includes: a plurality of second gate line segments 133, which are arranged between the plurality of first gate line segments 132 along the first direction A, and the length of the second gate line segments 133 along the first direction A is less than or equal to the length of the first gate line segments 132 along the first direction A.

[0055] In this embodiment, a second connecting gate line 13 includes two first gate line segments 132 and multiple second gate line segments 133. The two first gate line segments 132 are respectively arranged adjacent to the two side edges of the battery cell body 10 along the first direction A, and the multiple second gate line segments 133 are arranged between the two first gate line segments 132 along the first direction A. The length of the first gate line segment 132 in the first direction A is longer than the length of the second gate line segment 133 in the first direction A. The two ends of the second gate line segment 133 along the first direction A are respectively connected to the two adjacent secondary gate lines 14.

[0056] Therefore, by arranging multiple second grid line segments 133 between multiple first grid line segments 132 along the first direction A, it is convenient to collect the current in the middle area of ​​the battery cell body 10, thereby improving the current collection efficiency. The second grid line segment 133 is shorter and is arranged between two adjacent secondary grid lines 14, thereby reducing unnecessary material use, reducing costs, and improving light energy absorption efficiency. The first grid line segment 132 located at the edge of the battery cell body 10 is longer, which is convenient for reliable transmission of current. At the same time, the welding area between the welding strip 20 and the first grid line segment 132 can be increased, thereby improving the welding strength and connection reliability of the welding strip 20 and the battery cell body 10.

[0057] According to some embodiments of the present invention, Figure 2 As shown, the plurality of second gate line segments 133 are arranged in a staggered manner along the second direction B.

[0058] The second gate line segments 133 on the same second connection gate line 13 are arranged at intervals along the first direction A, and the second gate line segments 133 on adjacent second connection gate lines 13 are staggered along the second direction B, that is, the adjacent second gate line segments 133 along the second direction B are not completely opposite.

[0059] Therefore, the staggered arrangement of multiple second gate line segments 133 along the second direction B allows the second gate line segments 133 to be more evenly distributed on the surface of the entire battery cell body 10, ensuring that each auxiliary gate line 14 that is not electrically connected to the first gate line segment 132 is electrically connected to the second gate line segment 133, optimizing the current transmission path from the auxiliary gate line 14 to the connecting gate line 11, thereby reducing resistance losses and improving the current collection efficiency of the entire battery cell 100.

[0060] According to some embodiments of the present invention, Fig.12 As shown, a plurality of first grid line segments 132 and a plurality of second grid line segments 133 are sequentially connected along the first direction A. At this time, the second connection grid line 13 is a continuous grid line. A plurality of first grid line segments 132 are respectively arranged between two adjacent second connection grid lines 13 and between adjacent first connection grid lines 12, and a plurality of first grid line segments 132 are arranged at the two end edges of the battery cell body 10 along the first direction A. Thus, by sequentially connecting a plurality of first grid line segments 132 and a plurality of second grid line segments 133 along the first direction A, the printing difficulty of the second connection grid line 13 can be reduced, the printing efficiency can be improved, and thus the production efficiency of the battery cell 100 can be improved.

[0061] Alternatively, if Figure 2 As shown, a plurality of first gate line segments 132 and a plurality of second gate line segments 133 are arranged at intervals along the first direction A. At this time, the second connecting gate line 13 is an intermittent gate line. Therefore, by arranging a plurality of first gate line segments 132 and a plurality of second gate line segments 133 at intervals along the first direction A, the amount of slurry used when printing the second connecting gate line 13 can be effectively reduced, thereby reducing the production cost of the battery cell 100.

[0062] Optionally, a portion of the plurality of second gate line segments 133 and the plurality of first gate line segments 132 are connected in sequence along the first direction A, and another portion of the plurality of second gate line segments 133 are arranged at intervals along the first direction A, that is, a portion of the second connecting gate lines 13 are continuous gate lines, and another portion of the second connecting gate lines 13 are discontinuous gate lines.

[0063] According to some embodiments of the present invention, Figure 6 , Figure 7 , Fig.11 and Fig.12As shown, multiple second connecting grid lines 13 are arranged at intervals along the second direction B, and multiple second connecting grid lines 13 are arranged opposite to multiple first grid line connecting lines 16 along the thickness direction C of the battery cell body 10, and multiple first grid line connecting lines 16 are arranged between two adjacent second connecting grid lines 13, and multiple first grid line connecting lines 16 are arranged at intervals along the first direction A.

[0064] That is, two first connecting grid lines 12 are respectively arranged at the edge area of ​​the battery cell body 10 along the second direction B, and multiple second connecting grid lines 13 are arranged between the two first connecting grid lines 12 at intervals along the second direction B. Between every two adjacent second connecting grid lines 13 and between adjacent second connecting grid lines 13 and first connecting grid lines 12, there are multiple first grid line connecting lines 16 arranged at intervals along the first direction A and two first grid line segments 132 arranged at the edge of the battery cell along the first direction A.

[0065] Therefore, by providing a plurality of first gate line connecting lines 16 between two adjacent second connecting gate lines 13, that is, no second gate line segment 133 is provided between two adjacent second connecting gate lines 13 and between adjacent second connecting gate lines 13 and first connecting gate lines 12, the shielding area of ​​the connecting gate line 11 on the battery cell body 10 can be reduced, and the light energy utilization rate of the battery cell 100 can be improved. At the same time, the amount of printing paste used for the second connecting gate lines 13 can be reduced, and the production cost of the battery cell 100 can be reduced.

[0066] Alternatively, if Figure 4 and Figure 5 As shown, two first connecting grid lines 12 are respectively arranged at the edge area of ​​the battery cell body 10 along the second direction B, and only a plurality of first grid line connecting lines 16 and a plurality of first grid line segments 132 arranged at the edge of the battery cell along the first direction A are arranged between the two first connecting grid lines 12, that is, no second grid line segment 133 is arranged between the two first connecting grid lines 12. Thus, it is possible to further avoid the second grid line segment 133 from blocking the middle area of ​​the battery cell body 10, thereby reducing the production cost and further improving the light energy utilization rate of the battery cell 100.

[0067] According to some embodiments of the present invention, Figure 2 As shown, the auxiliary gate line 14 includes a plurality of auxiliary gate line segments 15, and the plurality of auxiliary gate line segments 15 are arranged at intervals along the second direction B. Two adjacent auxiliary gate line segments 15 along the second direction B define openings, and the plurality of openings are opposite along the first direction A. The first gate line connecting line 16 is arranged at the opening, and the two ends of the first gate line connecting line 16 along the second direction B are respectively electrically connected to the adjacent auxiliary gate line segments 15.

[0068] The plurality of auxiliary grid line segments 15 extend along the second direction B, and the plurality of auxiliary grid line segments 15 are arranged at intervals along the second direction B. A plurality of openings are defined between the plurality of auxiliary grid line segments 15 , and the plurality of openings and the plurality of auxiliary grid line segments 15 are arranged alternately in sequence.

[0069] Therefore, the setting of multiple openings reduces the coverage area of ​​the secondary grid line 14, thereby reducing the amount of printing paste for the secondary grid line 14, which is beneficial to reducing the production cost of the battery cell 100, and the setting of the openings provides a clear printing position for the first grid line connecting line 16, so that the first grid line connecting line 16 can be accurately set at the opening and electrically connected to the secondary grid line segment 15, ensuring the current transmission efficiency between the secondary grid line 14 and the connecting grid line 11.

[0070] According to some embodiments of the present invention, Figure 2 As shown, the cell 100 further includes: a plurality of second grid line connection lines 30 , which are arranged along the first direction A adjacent to the edge of the cell 100 , and are connected to at least two secondary grid lines 14 adjacent to the edge of the cell 100 .

[0071] Specifically, the second gate line connecting line 30 is arranged between the edge of the battery cell 100 and the connecting gate line 11 along the first direction A, and multiple second gate line connecting lines 30 are arranged at intervals along the second direction B, and one end of the second gate line connecting line 30 adjacent to the edge of the battery cell body 10 along the first direction A forms an electrical connection with at least two adjacent auxiliary gate lines 14, and one end of the second gate line connecting line 30 adjacent to the connecting gate line 11 along the first direction A forms an electrical connection with the connecting gate line 11 or the auxiliary gate line 14 adjacent to the connecting gate line 11.

[0072] Therefore, by arranging multiple second gate line connecting lines 30 along the first direction A adjacent to the edge of the battery cell 100, it is convenient for the second gate line connecting lines 30 to collect the current of the edge area of ​​the battery cell 100 along the first direction A, reduce the length of the connecting gate line 11 along the first direction A, and reduce the production cost of the connecting gate line 11. By connecting the second gate line connecting line 30 to at least two auxiliary gate lines 14 adjacent to the edge of the battery cell 100, the connection strength between the second gate line connecting line 30 and the auxiliary gate line 14 at the edge of the battery cell 100 can be improved, thereby ensuring the collection of current of the auxiliary gate line 14 in the edge area of ​​the battery cell 100 along the first direction A.

[0073] According to some embodiments of the present invention, Figure 2 As shown, along the first direction A, the secondary grid line 14 adjacent to the edge of the battery cell 100 includes a plurality of secondary grid line segments 15, and the second grid line connecting line 30 includes: a third grid line 31 and a fourth grid line 32, and the third grid line 31 and the fourth grid line 32 are arranged at intervals along the second direction B, and one end of the third grid line 31 and the fourth grid line 32 adjacent to the edge of the battery cell 100 is respectively connected to one end of two adjacent secondary grid line segments 15 adjacent to each other.

[0074] Specifically, one end of the third gate line 31 and the fourth gate line 32 adjacent to the edge of the battery cell 100 along the first direction A is respectively connected to one end of two auxiliary gate line segments 15 adjacent to each other arranged at intervals along the second direction B, and the other ends of the third gate line 31 and the fourth gate line 32 adjacent to the connecting gate line 11 extend along the first direction A and obliquely toward each other, and are connected to one end of the two adjacent auxiliary gate line segments 15 adjacent to each other, and the spacing between the third gate line 31 and the fourth gate line 32 along the second direction B gradually decreases along the first direction A toward the connecting gate line 11.

[0075] Therefore, by setting the third gate line 31 and the fourth gate line 32 to be respectively connected between multiple auxiliary gate line segments 15 to form a harpoon shape, the distance between the welding strip 20 and the adjacent auxiliary gate line segments 15 along the second direction B can be increased, avoiding the welding strip 20 from contacting the auxiliary gate line segments 15 with different polarities, optimizing the setting of the welding strip 20, avoiding short circuits, ensuring the collection of current in the edge area of ​​the battery cell 100 along the first direction A, and at the same time, improving the safety of the battery cell 100.

[0076] Optionally, the secondary grid line 14 arranged near the edge of the battery cell body 10 is intermittently arranged, and the second grid line connecting line 30 is arranged between two adjacent secondary grid line segments 15 along the second direction B, and is electrically connected to the two secondary grid line segments 15 respectively. When the welding strip 20 is arranged, the end of the welding strip 20 is arranged at intervals from the edge of the battery cell body 10 along the first direction A, which facilitates the arrangement of the welding strip 20 while ensuring the collection of the current on the secondary grid line 14 at the edge of the battery cell body 10.

[0077] According to a second aspect of the present invention, a photovoltaic module is Figure 1-Figure 10As shown, the battery cell 100 and a plurality of welding strips 20 are included. The battery cell 100 includes a battery cell body 10. A plurality of auxiliary grid lines 14 and a plurality of connecting grid lines 11 are provided on the battery cell body 10. The plurality of connecting grid lines 11 extend along a first direction A and are arranged at intervals along a second direction B. The plurality of auxiliary grid lines 14 extend along the second direction B. The plurality of connecting grid lines 11 include a plurality of first connecting grid lines 12 and a plurality of second connecting grid lines 13. The first connecting grid lines 12 are continuous grid lines. The plurality of first connecting grid lines 12 are arranged at the edge area of ​​the battery cell body 10 along the second direction B. The first connecting grid lines 12 are electrically connected to the plurality of auxiliary grid lines 14. The plurality of second connecting grid lines 13 are arranged at the edge area of ​​the battery cell body 10 along the second direction B. In the middle area of ​​the battery cell body 10, the second connecting grid line 13 is an intermittent grid line, or the second connecting grid line 13 is a continuous grid line, or a part of the second connecting grid line 13 is an intermittent grid line, and the other part of the second connecting grid line 13 is a continuous grid line, the second connecting grid line 13 includes a first grid line segment 132, and the first grid line segment 132 is arranged along the first direction A adjacent to the edge area of ​​the battery cell body 10; a part of the multiple welding strips 20 is arranged on the first connecting grid line 12, and another part of the multiple welding strips 20 is arranged on the multiple first grid line segments 132, and another part of the multiple welding strips 20 is electrically connected to the first grid line segments 132 at the corresponding ends along the first direction A.

[0078] Therefore, through the arrangement of multiple auxiliary grid lines 14 and multiple connecting grid lines 11 on the battery cell body 10, the collection and transmission of current on the surface of the battery cell body 10 is facilitated, ensuring that the current on the auxiliary grid lines 14 can be smoothly transmitted to the connecting grid lines 11, and preventing the edge EL of the battery cell 100 from turning black after the reliability test. When the current collection of some auxiliary grid lines 14 is abnormal, the second connecting grid line 13 is used to collect the current on some normal auxiliary grid lines 14. Through the setting of the welding strip 20, the current on the connecting grid lines 11 and the auxiliary grid lines 14 can be led out to the external circuit, ensuring that the current transmission path is efficient and low-impedance, thereby improving the reliability of the photovoltaic module 1.

[0079] According to some embodiments of the present invention, Fig. 9 and Fig.10 As shown, the photovoltaic module 1 further includes: a plurality of glue dots 21 , and the plurality of glue dots 21 respectively cover the soldering ribbon 20 on a side of the soldering ribbon 20 away from the connecting grid line 11 .

[0080] A plurality of glue dots 21 are arranged at intervals along the first direction A on the side of the soldering ribbon 20 away from the connecting grid line 11. The glue dots 21 provide a mechanical fixation function to ensure that the soldering ribbon 20 will not loosen or fall off during use. In the actual production process, the soldering ribbon 20 is first welded to the connecting grid line 11, and then the glue dots 21 are arranged on the side of the soldering ribbon 20 away from the battery cell 100.

[0081] Therefore, by setting up multiple glue points 21, the soldering ribbon 20 can be fixed on the battery cell 100, ensuring the structural stability of the soldering ribbon 20 on the battery cell 100, ensuring that the soldering ribbon 20 will not loosen or fall off during use, thereby improving the structural strength of the battery cell 100 and extending the service life of the battery cell 100.

[0082] According to some embodiments of the present invention, Figure 8 As shown, the glue points 21 arranged on two adjacent welding strips 20 on the same side of the battery cell 100 along the thickness direction C of the battery cell 100 are staggered along the second direction B. Therefore, by staggering the glue points 21 on the two adjacent welding strips 20 along the second direction B, the arrangement of the glue points 21 on the battery cell body 10 is optimized, the stress can be dispersed, the arrangement of the glue points 21 can be reduced, the cost can be reduced, and the connection reliability between the welding strip 20 and the battery cell body 10 can be increased, thereby improving the structural strength of the photovoltaic module 1.

[0083] Optionally, the glue points 21 provided on the two welding strips 20 arranged opposite to each other along the thickness direction C of the cell 100 are staggered along the thickness direction C of the cell 100. Thus, stress concentration along the thickness direction C of the cell 100 can be avoided when welding multiple welding strips 20, thereby improving the structural strength and reliability of the photovoltaic module 1.

[0084] Optionally, the glue points 21 provided on two adjacent welding strips 20 arranged on the same side of the battery cell 100 along the thickness direction C of the battery cell 100 are staggered along the second direction B, and at the same time, the glue points 21 provided on two welding strips 20 arranged opposite to each other along the thickness direction C of the battery cell 100 are staggered along the thickness direction C of the battery cell 100. In this way, the reliability and stability of welding of the welding strips 20 can be further improved, thereby further improving the reliability of the photovoltaic module 1.

[0085] According to some embodiments of the present invention, Fig. 9 As shown, the plurality of glue dots 21 include: a plurality of first glue dots 22, which are arranged adjacent to the edge of the battery cell 100 along the first direction A. The plurality of first glue dots 22 are arranged at intervals at both side edge regions of the battery cell 100 along the first direction A.

[0086] Therefore, by arranging a plurality of first glue dots 22 along the first direction A adjacent to the edge of the battery cell 100 , it is convenient to fix the two ends of the soldering ribbon 20 along the first direction A to the battery cell 100 , thereby improving the connection strength between the soldering ribbon 20 and the battery cell 100 .

[0087] According to some embodiments of the present invention, Fig. 9As shown, multiple second glue dots 23 are arranged between multiple first glue dots 22 along the first direction A. Along the first direction A, the spacing between adjacent first glue dots 22 and second glue dots 23 is less than or equal to the spacing between two adjacent second glue dots 23.

[0088] A plurality of second glue dots 23 are spaced apart along the first direction A between two first glue dots 22 that are away from the edge of the battery cell 100 and adjacent to each other, and a spacing between adjacent first glue dots 22 and second glue dots 23 is smaller than a spacing between two adjacent second glue dots 23, that is, a density of the glue dots 21 adjacent to the edge of the battery cell 100 along the first direction A is greater than a density of the glue dots 21 in the middle area of ​​the battery cell 100.

[0089] Thus, by providing multiple second glue points 23, the connection strength and reliability between the welding ribbon 20 and the cell 100 can be further improved, and by increasing the density of the glue points 21 at the edge of the cell 100, the welding ribbon 20 is provided with mechanical fixation, and the connection strength between the two ends of the welding ribbon 20 along the first direction A and the cell 100 is improved, and the reliability of the photovoltaic module 1 is improved, and it is ensured that the welding ribbon 20 will not loosen or fall off during use, and the structural strength of the cell 100 is improved, and the service life of the cell 100 is extended. At the same time, the spacing between the middle second glue points 23 is large, and the number of the second glue points 23 can be reduced, ensuring that the welding ribbon 20 is electrically connected to the auxiliary grid line 14 or the connecting grid line 11, while reducing the cost.

[0090] According to some embodiments of the present invention, the sum of the projected areas of the plurality of glue dots 21 on the battery cell 100 is S1, the area of ​​the battery cell 100 is S2, and S1 and S2 satisfy: 0.1%≤S1 / S2≤0.76%. For example, S1 / S2=0.5%.

[0091] Therefore, by limiting the range of the sum of the projected areas of the plurality of glue dots 21 on the battery cell 100 , the connection strength between the welding strip 20 and the battery cell 100 is ensured, while preventing the glue dots 21 from blocking too large an area of ​​the battery cell 100 , thereby ensuring effective transmission of current and improving the output power of the photovoltaic module 1 .

[0092] According to some embodiments of the present invention, the distance between the glue point 21 and the battery cell 100 is H1, and the distance between the soldering ribbon 20 and the battery cell 100 is H2, and H1 and H2 satisfy: 10 μm≤H1-H2≤100 μm.

[0093] That is, the height of the glue point 21 in the thickness direction C of the battery cell 100 is controlled between 10μm and 100μm. If the height of the glue point 21 in the thickness direction C of the battery cell 100 is too low, it will affect the adhesion between the soldering tape 20 and the battery cell 100. If the height of the glue point 21 in the thickness direction C of the battery cell 100 is too high, there is a risk that the glue point 21 may pierce the glue film, thereby affecting the reliability of the battery cell 100.

[0094] Therefore, by limiting the height range of the glue point 21 in the thickness direction C of the battery cell 100, the glue point 21 can better cover the soldering ribbon 20, provide a stronger mechanical fixation effect, prevent the soldering ribbon 20 from loosening or falling off, and avoid the risk of the glue point 21 piercing the adhesive film during the subsequent lamination process, thereby improving the stability and durability of the overall structure of the photovoltaic module 1.

[0095] According to some embodiments of the present invention, Fig. 9 As shown, the pad 19 is disposed between the third grid line 31 and the fourth grid line 32 of the battery cell 100 , and the pad 19 is spaced apart from the third grid line 31 and the fourth grid line 32 .

[0096] The soldering pad 19 is arranged on the side of the secondary grid line 14 away from the battery cell body 10 along the thickness direction C of the battery cell 100, and the soldering pad 19 is arranged between the third grid line 31 and the fourth grid line 32 along the second direction B. When a first glue dot 22 is provided on the side along the first direction A of the edge of the battery cell body 10, the soldering pad 19 adjacent to the first glue dot 22 is arranged between the adjacent first glue dot 22 and the second glue dot 23 along the first direction A; when a plurality of first glue dots 22 are provided on the side along the first direction A of the edge of the battery cell body 10, the soldering pad 19 is arranged between two first glue dots 22 adjacent to the edge of the battery cell 100 along the first direction A.

[0097] Thus, by arranging the solder pad 19 inside the second grid line connection line 30 and between the two glue points 21 at the edge, after the soldering between the soldering ribbon 20 and the cell 100, the reliability of the soldering ribbon 20 and the connection strength with the cell 100 can be increased, the soldering ribbon 20 can be prevented from being offset, the structural strength of the photovoltaic module 1 can be improved, and the current can be smoothly transmitted from the soldering ribbon 20 to the external circuit. In the actual production process, the soldering ribbon 20 is first welded, and then the glue point 21 is set on the side of the soldering ribbon 20 away from the cell 100.

[0098] The photovoltaic module 1 according to the embodiment of the present invention can improve the reliability of the photovoltaic module 1 , improve the photoelectric conversion efficiency of the photovoltaic module 1 , and extend the service life of the photovoltaic module 1 by applying the battery cell 100 in the above embodiment.

[0099] In the description of the present invention, 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 invention 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 limiting the present invention.

[0100] In the description of the present invention, "first feature" and "second feature" may include one or more of the features. In the description of the present invention, "plurality" means two or more. In the description of the present invention, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. In the description of the present invention, a first feature "above", "above" and "above" a second feature may include the first feature being directly above and obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature.

[0101] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0102] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A battery cell body, wherein a plurality of auxiliary grid lines and a plurality of connecting grid lines are arranged on the battery cell body, the plurality of connecting grid lines extend along a first direction and are arranged at intervals along a second direction, the plurality of auxiliary grid lines extend along the second direction, the plurality of connecting grid lines include a plurality of first connecting grid lines and a plurality of second connecting grid lines, the first connecting grid lines are continuous grid lines, the plurality of first connecting grid lines are arranged at an edge area of ​​the battery cell body along the second direction, the first connecting grid lines are electrically connected to the plurality of auxiliary grid lines, the plurality of second connecting grid lines are arranged at a middle area of ​​the battery cell body, the second connecting grid lines are discontinuous grid lines and / or continuous grid lines, the second connecting grid lines include a first grid line segment, and the first grid line segment is arranged adjacent to an edge area of ​​the battery cell body along the first direction.

2. The battery cell according to claim 1, characterized in that: Also includes: A plurality of first gate line connection lines are respectively arranged at the intersection of the connecting gate line and the auxiliary gate line, or a plurality of first gate line connection lines are respectively arranged at the intersection of the connecting gate line and the extension line of the auxiliary gate line, a plurality of first gate line connection lines are electrically connected to the connecting gate line, and the connecting gate line is electrically connected to at least two of the auxiliary gate lines through the first gate line connection lines along a first direction.

3. The battery cell according to claim 2, characterized in that: The first gate line connection line comprises: A first gate line extends along the second direction, at least a portion of the first gate line overlaps the auxiliary gate line, and a width of at least a portion of the first gate line along the first direction is greater than or equal to a width of the auxiliary gate line along the first direction.

4. The battery cell according to claim 3, characterized in that: The projection of the first grid line on the battery cell body is in a rhombus or rectangle shape.

5. The battery cell according to claim 3, characterized in that: The first gate line connection line further includes: The second gate line is arranged at two ends of the first gate line along the second direction, the second gate line extends along the first direction, and the width of the second gate line along the first direction is greater than or equal to the width of the first gate line along the first direction.

6. The battery cell according to claim 5, characterized in that: The length of the second gate line in the first direction is L1, and L1 satisfies: 0.11 mm≤L1≤0.21 mm; and / or, The overlapping length of the first gate line and the auxiliary gate line is L2, and L2 satisfies: 0.065mm≤L2≤0.165mm.

7. The battery cell according to claim 2, characterized in that: The second connecting gate line further includes: A plurality of second gate line segments are arranged between the plurality of first gate line segments along the first direction, and a length of the second gate line segment along the first direction is less than or equal to a length of the first gate line segment along the first direction.

8. The battery cell according to claim 7, characterized in that: A plurality of the second gate line segments are staggeredly arranged along the second direction.

9. The battery cell according to claim 7, characterized in that: A plurality of the first gate line segments and a plurality of the second gate line segments are sequentially connected along the first direction; and / or, A plurality of the first gate line segments and a plurality of the second gate line segments are arranged at intervals along the first direction.

10. The battery cell according to claim 2, characterized in that: Multiple second connecting grid lines are arranged at intervals along the second direction, and multiple second connecting grid lines are arranged opposite to multiple first grid line connecting lines along the thickness direction of the battery cell body, multiple first grid line connecting lines are arranged between two adjacent second connecting grid lines, and multiple first grid line connecting lines are arranged at intervals along the first direction.

11. The battery cell according to claim 2, characterized in that: The secondary gate line includes multiple secondary gate line segments, and the multiple secondary gate line segments are arranged at intervals along the second direction. Two adjacent secondary gate line segments along the second direction define openings, and the multiple openings are opposite to each other along the first direction. The first gate line connecting line is arranged at the opening, and the two ends of the first gate line connecting line along the second direction are respectively electrically connected to the adjacent secondary gate line segments.

12. The battery cell according to claim 1, characterized in that: Also includes: A plurality of second gate line connection lines are arranged along the first direction adjacent to the edge of the battery cell, and the second gate line connection lines are connected to at least two of the secondary gate lines adjacent to the edge of the battery cell.

13. The battery cell according to claim 12, characterized in that: Along the first direction, the secondary grid line adjacent to the edge of the cell includes a plurality of secondary grid line segments, and the second grid line connecting line includes: The third grid line; The fourth gate line, the third gate line and the fourth gate line are arranged at intervals along the second direction, and one end of the third gate line and the fourth gate line adjacent to the edge of the battery cell are respectively connected to one end of two adjacent auxiliary gate line segments adjacent to each other.

14. A photovoltaic module, characterized in that: include: A battery cell, the battery cell comprising a battery cell body, the battery cell body being provided with a plurality of secondary grid lines and a plurality of connecting grid lines, the plurality of connecting grid lines extending along a first direction and being arranged at intervals along a second direction, the plurality of secondary grid lines extending along the second direction, the plurality of connecting grid lines comprising a plurality of first connecting grid lines and a plurality of second connecting grid lines, the first connecting grid lines being continuous grid lines, the plurality of first connecting grid lines being arranged at an edge region of the battery cell body along the second direction, the first connecting grid lines being electrically connected to the plurality of secondary grid lines, the plurality of second connecting grid lines being arranged at a middle region of the battery cell body, the second connecting grid lines being discontinuous grid lines and / or continuous grid lines, the second connecting grid lines comprising a first grid line segment, the first grid line segment being arranged adjacent to an edge region of the battery cell body along the first direction; A plurality of welding strips, a portion of which is disposed on the first connecting grid line, another portion of which is disposed on the first grid line segments, and another portion of which is electrically connected to the first grid line segments at corresponding ends along the first direction.

15. The photovoltaic module according to claim 14, characterized in that: Also includes: A plurality of glue dots are provided, and the plurality of glue dots respectively cover the soldering strip on a side of the soldering strip away from the connecting grid line.

16. The photovoltaic module according to claim 15, characterized in that: The glue points arranged on two adjacent welding strips arranged on the same side of the battery cell along the thickness direction of the battery cell are staggered along the second direction; and / or, The glue points arranged on the two welding strips arranged opposite to each other along the thickness direction of the battery cell are staggered and distributed along the thickness direction of the battery cell.

17. The photovoltaic module according to claim 15, characterized in that: The plurality of glue dots include: A plurality of first glue points are arranged along the first direction adjacent to the edge of the battery sheet.

18. The photovoltaic module according to claim 17, characterized in that: The plurality of glue dots include: A plurality of second glue dots are arranged between the plurality of first glue dots along the first direction, and a spacing between adjacent first glue dots and second glue dots along the first direction is less than or equal to a spacing between two adjacent second glue dots.

19. The photovoltaic module according to claim 15, characterized in that: The sum of the projected areas of the plurality of glue spots on the battery cell is S1, the area of ​​the battery cell is S2, and S1 and S2 satisfy: 0.1%≤S1 / S2≤0.76%.

20. The photovoltaic module according to claim 15, characterized in that: The distance between the glue point and the battery cell is H1, the distance between the welding strip and the battery cell is H2, and H1 and H2 satisfy: 10 μm≤H1-H2≤100 μm.

21. The photovoltaic module according to claim 15, characterized in that: Also includes: A plurality of solder pads are arranged adjacent to the edge of the battery cell along the first direction, and the solder pads are arranged between two glue points adjacent to the edge of the battery cell along the first direction.

22. The photovoltaic module according to claim 21, characterized in that: The pad is disposed between the third grid line and the fourth grid line of the battery cell, and the pad is spaced apart from the third grid line and the fourth grid line.

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