Battery piece assembly and photovoltaic assembly

Abstract

The utility model discloses a battery piece assembly and a photovoltaic assembly. The battery piece assembly comprises battery pieces. A plurality of main grid lines, a plurality of auxiliary grid lines and a plurality of welding spots are arranged on the battery piece, each auxiliary grid line comprises a plurality of grid line segments, and the grid line segments are arranged at intervals in the second direction; each main grid line comprises two sub-grid lines, the two sub-grid lines are arranged between the two adjacent grid line segments in the second direction, the sub-grid lines are electrically connected with the adjacent grid line segments, the welding spots are arranged between the two adjacent sub-grid lines, and the welding spots are at least electrically connected with the two sub-grid lines respectively. Therefore, when the grid line segment and one of the connected sub-grid lines are broken or subjected to pseudo soldering, the grid line segment is kept electrically connected with the other connected sub-grid line, so that the collection of current on the grid line segment by the sub-grid lines is ensured, the possibility of welding deviation when a welding strip is welded with a welding spot is reduced, and the refinement of the auxiliary grid line is realized; the connection reliability of the sub grid lines and the battery piece is improved, flow paths for collecting current on the grid line segments are increased, and the current transmission efficiency and reliability of the battery piece assembly are improved.

Description

Technical Field

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

[0002] In existing technologies, the solder ribbon is prone to overlap with the sub-busbars, which can easily lead to issues such as broken sub-busbars and poor soldering of the solder ribbon, affecting the welding effect, hindering the collection of current from the solar cells, and causing the solder ribbon to fall off after the solar cell module is laminated, thus reducing the reliability of the solar cell module. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a battery cell assembly that can improve the reliability of the battery cell assembly.

[0004] The second objective of this invention is to provide a photovoltaic module, including the cell module of the first aspect embodiment described above.

[0005] According to a first aspect embodiment of the present invention, the battery cell assembly includes: a battery cell, wherein the battery cell is provided with a plurality of main grid lines, a plurality of sub-grid lines and a plurality of solder joints, the plurality of main grid lines extending along a first direction and spaced apart along a second direction, the plurality of sub-grid lines spaced apart along the first direction and extending along the second direction, each sub-grid line including a plurality of grid line segments, the plurality of grid line segments being spaced apart along the second direction; each main grid line including two sub-grid lines, the two sub-grid lines being disposed along the second direction between two adjacent grid line segments, the sub-grid lines being electrically connected to adjacent grid line segments, and the solder joints being disposed between two adjacent sub-grid lines, the solder joints being electrically connected to at least two sub-grid lines respectively.

[0006] According to the embodiments of the present invention, the battery cell assembly, by arranging two sub-grid lines spaced apart along a second direction between two adjacent grid line segments, can achieve current collection on the two adjacent grid line segments. When one of the connected sub-grid lines of the grid line segment is broken or poorly soldered, the grid line segment remains electrically connected to the other connected sub-grid line, ensuring that the sub-grid line collects current on the grid line segment, reducing the possibility of solder strip misalignment when soldering to the solder joint, achieving refinement of the sub-grid lines, and reducing costs. At the same time, the solder joint is electrically connected to the two sub-grid lines respectively, which facilitates the increase of the reliability of the connection between the sub-grid line and the battery cell and increases the current collection path on the grid line segment, thereby improving the current transmission efficiency of the battery cell assembly and improving the reliability of the battery cell assembly.

[0007] In some embodiments, the spacing between two adjacent sub-gate lines is L1, wherein L1 satisfies: 0.8mm≤L1≤1.2mm.

[0008] In some embodiments, at least a portion of the solder joint overlaps with at least one of two adjacent gate segments along the second direction.

[0009] In some embodiments, the length of the solder joint along the second direction is L2, wherein L2 satisfies: 0.6mm≤L2≤1.2mm; and / or, the length of the solder joint along the first direction is L3, wherein L3 satisfies: 0.2mm≤L3≤0.8mm.

[0010] In some embodiments, the cell assembly further includes a solder ribbon disposed between two adjacent sub-busbars, the solder ribbon being electrically connected to the solder joint.

[0011] In some embodiments, the solder strip and the sub-busbar are spaced apart along the second direction; and / or, the end of the solder strip along the first direction is spaced apart from the adjacent edge of the solar cell.

[0012] In some embodiments, the cell assembly further includes: a grid line connection line disposed at at least one end of the sub-grid line, the grid line connection line being electrically connected along the first direction to at least two of the sub-grid lines adjacent to the edge of the cell, and the grid line connection line being electrically connected to the sub-grid line; and / or, the grid line connection line being electrically connected to one of the plurality of solder joints adjacent to the edge of the cell.

[0013] In some embodiments, the distance between adjacent gate line connections is greater than or equal to the distance between two adjacent sub-gate lines.

[0014] In some embodiments, the width of the sub-gate line along the first direction is L4, wherein L4 satisfies: 4μm≤L4≤12μm.

[0015] The photovoltaic module according to the second aspect of the present invention includes the cell module of the first aspect of the present invention.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of a battery cell assembly according to a first aspect embodiment of the present invention.

[0019] Figure label:

[0020] 100. Solar cell assembly;

[0021] 10. Battery cells;

[0022] 20. Main grid line; 21. Sub-grid line; 22. Auxiliary grid line; 23. Grid line segment; 24. Solder joint; 25. Grid line connector;

[0023] A. First direction; B. Second direction. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1 A battery cell assembly 100 according to an embodiment of the present utility model is described. The battery cell assembly 100 includes: battery cells 10.

[0025] like Figure 1 As shown, the solar cell 10 has multiple main grid lines 20, multiple sub-grid lines 22, and multiple solder joints 24. The multiple main grid lines 20 extend along a first direction A and are spaced apart along a second direction B. The multiple sub-grid lines 22 are spaced apart along the first direction A and extend along the second direction B. Each sub-grid line 22 includes multiple grid line segments 23, which are spaced apart along the second direction B. Each main grid line 20 includes two sub-grid lines 21, which are located between two adjacent grid line segments 23 along the second direction B. The sub-grid lines 21 are electrically connected to the adjacent grid line segments 23. Solder joints 24 are located between two adjacent sub-grid lines 21 and are electrically connected to at least two sub-grid lines 21 respectively. In this embodiment, the first direction A is the length direction of the solar cell 10, and the second direction B is the width direction of the solar cell 10.

[0026] Two sub-gate lines 21 extend along a first direction A and are spaced apart along a second direction B between two adjacent gate line segments 23. The two sub-gate lines 21 are electrically connected to multiple gate line segments 23 spaced apart along the first direction A on their respective sides along the second direction B, so as to collect the current on the multiple gate line segments 23. In this embodiment, multiple solder points 24 are spaced apart along the first direction A, and the two ends of the solder points 24 are electrically connected to two adjacent sub-gate lines 21 along the second direction B, so that the solder points 24 can collect the current on the two sub-gate lines 21.

[0027] According to the embodiment of the present invention, the battery cell assembly 100, by arranging two sub-grid lines 21 at intervals along the second direction B between two adjacent grid line segments 23, can achieve current collection on the two adjacent grid line segments 23. When the grid line segment 23 is broken or poorly soldered with one of the connected sub-grid lines 21, the grid line segment 23 is kept electrically connected to the other connected sub-grid line 21, ensuring that the sub-grid line 21 collects current on the grid line segment 23, reducing the possibility of solder strip misalignment when soldering to the solder joint 24, achieving refinement of the sub-grid line 22, and reducing costs; at the same time, the solder joint 24 is electrically connected to the two sub-grid lines 21 respectively, which facilitates the increase of the reliability of the connection between the sub-grid line 21 and the battery cell 10 and increases the current collection path on the grid line segment 23, thereby improving the current transmission efficiency of the battery cell assembly 100 and improving the reliability of the battery cell assembly 100.

[0028] According to some embodiments of the present invention, the spacing between two adjacent sub-grid lines 21 is L1, and L1 satisfies: 0.8mm≤L1≤1.2mm.

[0029] When the spacing between two adjacent sub-grid lines 21 is less than 0.8 mm, the spacing is too small, which may increase the processing difficulty of the sub-grid lines 21. The solder joints 24 between the two adjacent sub-grid lines 21 are also small, affecting the current transmission efficiency. When the spacing between two adjacent sub-grid lines 21 is greater than 1.2 mm, the spacing is too large, which may result in shorter lengths of multiple grid line segments 23 on both sides of the two sub-grid lines 21 that are far apart along the second direction B. At the same time, the solder joints 24 between the two adjacent sub-grid lines 21 are larger, which is not conducive to the collection of current in the cell 10 region between the two sub-grid lines 21, and the output power of the cell 10 is reduced. For example, L1 = 1 mm.

[0030] Therefore, limiting the spacing range between two adjacent sub-grid lines 21 can effectively improve current transmission efficiency, while reducing the shading area of ​​the solder joint 24 on the cell 10, reducing shading loss, increasing the output power of the cell assembly 100, and thus improving the reliability of the cell assembly 100.

[0031] According to some embodiments of this utility model, such as Figure 1 As shown, at least a portion of solder joint 24 overlaps with at least one of two adjacent gate segments 23 along the second direction B.

[0032] The solder joint 24 is adjacent to at least one end of the sub-grid line 21 along the second direction B and the projection of the adjacent grid line segment 23 along the thickness direction of the cell 10 coincides, that is, the solder joint 24 is adjacent to at least one end of the sub-grid line 21 along the second direction B and the adjacent grid line segment 23 forms an electrical connection.

[0033] Preferably, the two ends of the solder joint 24 along the second direction B can be electrically connected to two adjacent sub-gate lines 21 and the adjacent gate line segment 23, respectively.

[0034] Therefore, at least a portion of the solder joint 24 overlaps with at least one of the two adjacent grid segments 23 along the second direction B, which can improve the connection strength between the sub-grid line 21 and the grid segment 23, improve the current collection efficiency on the grid segment 23, and at the same time improve the structural strength of the grid segment 23. During the welding process, the sub-grid line 22 is prevented from breaking, thereby improving the reliability of the battery cell assembly 100.

[0035] According to some embodiments of the present invention, the length of the solder joint 24 along the second direction B is L2, and L2 satisfies: 0.6mm≤L2≤1.2mm.

[0036] When the length of solder joint 24 along the second direction B is less than 0.6 mm, the length of solder joint 24 along the second direction B is too small, which may cause the electrical connection between solder joint 24 and the two adjacent sub-busbar lines 21 to fail. The main busbar line 20 and the cell 10 are prone to relative displacement, reducing the current collection capacity. When the length of solder joint 24 along the second direction B is greater than 1.2 mm, the length of solder joint 24 along the second direction B is too large, which may cause the size of solder joint 24 to be too large, increasing the cost of solder joint 24. At the same time, it increases the light-shielding area of ​​solder joint 24 on cell 10, reducing the output power of cell module 100. For example, L2 = 1 mm.

[0037] Optionally, the length of the solder joint 24 along the first direction A is L3, and L3 satisfies: 0.2mm≤L3≤0.8mm.

[0038] When the length of solder joint 24 along the first direction A is less than 0.2 mm, the length of solder joint 24 along the first direction A is small, which may reduce the contact area between solder joint 24 and the two adjacent sub-busbars 21 along the first direction A, reduce the structural strength of the main busbar 20, and make the main busbar 20 and the cell 10 prone to relative displacement. When the length of solder joint 24 along the first direction A is greater than 0.8 mm, the length of solder joint 24 along the first direction A is too large, which may lead to an excessively large size of solder joint 24, increasing the cost of solder joint 24, and increasing the light-shielding area of ​​solder joint 24 on the cell 10, reducing the output power of the cell module 100. For example, L3 = 0.5 mm.

[0039] Optionally, the length of the solder joint 24 along the second direction B is L2, and L2 satisfies: 0.6mm≤L2≤1.2mm; at the same time, the length of the solder joint 24 along the first direction A is L3, and L3 satisfies: 0.2mm≤L3≤0.8mm.

[0040] Therefore, by limiting the length range of solder joint 24 along the second direction B and the length range of solder joint 24 along the first direction A, the connection strength and reliability between solder joint 24 and main bus line 20 can be improved, the cost of solder joint 24 can be reduced, the shading area of ​​solder joint 24 on solar cell 10 can be reduced, the shading loss of solar cell assembly 100 can be reduced, and the output power of solar cell assembly 100 can be improved.

[0041] According to some embodiments of the present invention, the battery cell assembly 100 further includes: a solder strip disposed between two adjacent sub-grid lines 21, and the solder strip is electrically connected to the solder joint 24.

[0042] The solder strip extends along the first direction A, and is positioned between two adjacent grid line segments 23 and between two adjacent sub-grid lines 21. The solder strip forms an electrical connection with multiple solder points 24 spaced apart along the first direction A, allowing the solder strip to conduct the current collected at the solder points 24. Specifically, the solder strip is electrically connected to the solder points 24, and the solder points 24 are electrically connected to the sub-grid lines 21. The current on the grid line segments 23 is collected through the sub-grid lines 21 and flows to the solder strip through the solder points 24. The solder strip does not overlap with the sub-grid lines 21 or the grid line segments 23.

[0043] Therefore, by placing the solder strip between two sub-busbar lines 21 and electrically connecting it to the solder joint 24, the current on multiple busbar segments 23 is collected to two adjacent sub-busbar lines 21, and then to adjacent solder joints 24. This current is then discharged through the solder strip, which is electrically connected to multiple solder joints 24, thereby improving the current collection efficiency of the solar cell module 100 and enhancing its operating efficiency and reliability. Reducing the width of the busbar segments 23 reduces the impact of the solder strip welding temperature on the welding quality in conventional technologies, effectively preventing busbar breakage. Furthermore, since the solder strip is only electrically connected to the solder joint 24, welding reliability, welding efficiency, and welding yield are improved, preventing the occurrence of incomplete soldering between the solder joint 24 and the solder strip. Simultaneously, because the solder strip is electrically connected to the sub-busbar lines 21 through the solder joint 24, placing the solder strip between two adjacent sub-busbar lines 21 reduces the impact of solder strip misalignment on welding quality and improves welding yield. According to some embodiments of this utility model, the solder strip and the sub-busbar lines 22 are spaced apart along the second direction B. In other words, the solder ribbon does not contact the adjacent grid line segment 23 on either side along the second direction B. Therefore, by spacing the solder ribbon and sub-grid line 22 along the second direction B, contact between the solder ribbon and the sub-grid line 22 can be avoided. During the welding process, this prevents grid breakage in the sub-grid line 22 due to excessive welding temperature, reduces the probability of incomplete soldering between the solder ribbon and the solder joint 24, improves welding yield, and thus enhances the reliability and safety of the cell module 100. Furthermore, since the solder ribbon does not contact the grid line segment 23 of the sub-grid line 22, the sub-grid line 22 does not need to perform the welding function. This reduces the amount of paste used in the sub-grid line 22, optimizes its structure, reduces costs, and facilitates the lightweight design of the cell module 100.

[0044] Optionally, the solder ribbon is spaced apart from the edge of the adjacent cell 10 along the first direction A. That is, the solder joint 24 is spaced apart from the sub-busbar line 22 of the edge of the cell 10 along the first direction A. Thus, by spaced apart from the edge of the adjacent cell 10 along the first direction A, the solder ribbon is prevented from overlapping with the sub-busbar line 22 of the adjacent edge, thus preventing short circuits in the cell assembly 100. At the same time, the cost of the solder ribbon is reduced, thereby saving the production cost of the cell assembly 100 and improving the safety and reliability of the cell assembly 100.

[0045] Optionally, the solder strip and the sub-busbar 22 are spaced apart along the second direction B; at the same time, the end of the solder strip along the first direction A is spaced apart from the edge of the adjacent cell 10.

[0046] Therefore, by setting the solder strip, when a slight soldering deviation occurs, the solder strip remains positioned between two adjacent sub-busbar lines 21 and does not contact the sub-busbar line 22. This avoids the sub-busbar line 22 from breaking, improving the safety and reliability of the cell module 100. Simultaneously, since the sub-busbar line 22 is not welded to the solder strip, the width of the sub-busbar line 22 along the first direction A can be reduced, thus saving paste.

[0047] According to some embodiments of this utility model, such as Figure 1 As shown, the battery cell assembly 100 further includes: a grid line connection line 25, which is disposed at at least one end of a sub-grid line 21. The grid line connection line 25 is electrically connected along a first direction A to at least two sub-grid lines 22 adjacent to the edge of the battery cell 10, and the grid line connection line 25 is electrically connected to the corresponding sub-grid line 21.

[0048] One end of the grid line connecting line 25, along the first direction A near the edge of the cell 10, is electrically connected to at least two sub-grid lines 22 at the edge of the cell 10. The other end of the grid line connecting line 25, along the first direction A away from the edge of the cell 10, is electrically connected to at least one end of two adjacent sub-grid lines 21 near the edge of the cell 10. This allows for current collection on multiple sub-grid lines 22 between the end of the main grid line 20 near the edge of the cell 10 along the first direction A and the edge of the cell 10, thereby improving the output power of the cell assembly 100.

[0049] Optionally, the grid line connection line 25 is electrically connected to the solder point 24 adjacent to the edge of the cell 10 among the plurality of solder points 24. Thus, by forming an electrical connection between the grid line connection line 25 and the solder point 24 adjacent to the edge of the cell 10 among the plurality of solder points 24, the conductivity of the grid line connection line 25 can be improved, the connection strength between the grid line connection line 25 and the sub-grid line 22 and the main grid line 20 can be increased, relative displacement between the grid line connection line 25 and the cell 10 can be avoided, and the reliability of the cell assembly 100 can be improved.

[0050] Therefore, by setting the grid line connection line 25, the current collection efficiency on the multiple sub-grid lines 22 between the end of the main grid line 20 adjacent to the edge of the cell 10 along the first direction A can be improved, the structural strength and conductivity of the grid line connection line 25 can be improved, thereby improving the output power and current collection efficiency of the cell assembly 100 and improving the reliability of the cell assembly 100.

[0051] Optionally, the grid line connection line 25 is electrically connected along the first direction A to at least two sub-grid lines 22 adjacent to the edge of the cell 10, and the grid line connection line 25 is electrically connected to the sub-grid line 21. At the same time, the grid line connection line 25 is electrically connected to the solder point 24 adjacent to the edge of the cell 10 among the plurality of solder points 24.

[0052] According to some embodiments of this utility model, such as Figure 1 As shown, the distance between adjacent grid line connecting lines 25 is greater than or equal to the distance between two adjacent sub-grid lines 21.

[0053] For example, along the first direction A toward the edge of the cell 10, the distance between adjacent grid line connecting lines 25 gradually increases, and the distance between adjacent grid line connecting lines 25 is greater than the distance between two adjacent sub-grid lines 21. This increases the length of the grid line segments 23 at both ends of the grid line connecting lines 25 along the second direction B, increasing the current utilization rate and output power of the cell assembly 100, and further reducing the possibility of the solder ribbon overlapping with the sub-grid lines 22 adjacent to the edge of the cell 10.

[0054] Therefore, the distance between adjacent grid line connecting lines 25 is greater than or equal to the distance between two adjacent sub-grid lines 21, which can prevent the solder ribbon from contacting the sub-grid line 22 when it shifts, avoid short circuits, and at the same time increase the current utilization rate and output power of the cell module 100, thereby improving the reliability of the cell module 100.

[0055] Optionally, along the first direction A, the distance between adjacent grid line connecting lines 25 is equal to the distance between two adjacent sub-grid lines 21. This can improve printing efficiency.

[0056] According to some embodiments of the present invention, the width of the sub-gate line 22 along the first direction A is L4, and L4 satisfies: 4μm≤L4≤12μm.

[0057] When the width of the sub-busbar 22 along the first direction A is less than 4 μm, the width of the sub-busbar 22 along the first direction A is too small, which may lead to an increase in the resistance of the sub-busbar 22 and a lower current transfer efficiency. When the width of the sub-busbar 22 along the first direction A is greater than 12 μm, the width of the sub-busbar 22 along the first direction A is large, which may increase the shading area of ​​the sub-busbar 22 on the solar cell 10, increase light shading loss, and reduce the output power of the solar cell assembly 100. For example, L4 = 8 μm.

[0058] Therefore, by limiting the width range of the sub-grid line 22 along the first direction A, the resistance of the sub-grid line 22 can be reduced, the current transmission efficiency of the sub-grid line 22 can be improved, the shading area of ​​the sub-grid line 22 on the solar cell 10 can be reduced, the light shading loss can be reduced, and the output power and reliability of the solar cell assembly 100 can be improved.

[0059] The photovoltaic module according to the second aspect of the present invention includes the cell module 100 of the first aspect of the present invention.

[0060] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0061] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0063] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell assembly, characterized in that, include: A battery cell, wherein the battery cell is provided with a plurality of main grid lines, a plurality of sub-grid lines and a plurality of solder joints, the plurality of main grid lines extending along a first direction and spaced apart along a second direction, the plurality of sub-grid lines spaced apart along the first direction and extending along the second direction, the sub-grid lines comprising a plurality of grid line segments, the plurality of grid line segments being spaced apart along the second direction; Each of the main grid lines includes two sub-grid lines, which are disposed along the second direction between two adjacent grid line segments. The sub-grid lines are electrically connected to the adjacent grid line segments. The solder joints are disposed between two adjacent sub-grid lines and are electrically connected to at least two of the sub-grid lines respectively.

2. The battery cell assembly according to claim 1, characterized in that, The spacing between two adjacent sub-gate lines is L1, and L1 satisfies: 0.8mm≤L1≤1.2mm.

3. The battery cell assembly according to claim 1, characterized in that, At least a portion of the solder joint overlaps with at least one of the two adjacent gate segments along the second direction.

4. The battery cell assembly according to claim 1, characterized in that, The length of the solder joint along the second direction is L2, and L2 satisfies: 0.6mm ≤ L2 ≤ 1.2mm; and / or, The length of the solder joint along the first direction is L3, and L3 satisfies: 0.2mm≤L3≤0.8mm.

5. The battery cell assembly according to claim 1, characterized in that, Also includes: A solder strip is disposed between two adjacent sub-grid lines and is electrically connected to the solder joint.

6. The battery cell assembly according to claim 5, characterized in that, The solder strips and the sub-gate lines are spaced apart along the second direction; and / or, The ends of the solder strips along the first direction are spaced apart from the edges of the adjacent solar cells.

7. The battery cell assembly according to claim 1, characterized in that, It also includes: a grid line connecting line, the grid line connecting line being disposed at at least one end of the sub-grid line, the grid line connecting line being electrically connected along the first direction to at least two of the sub-grid lines adjacent to the edge of the solar cell, and the grid line connecting line being electrically connected to the sub-grid line; and / or, The grid line connection is electrically connected to the solder joint adjacent to the edge of the battery cell among the plurality of solder joints.

8. The battery cell assembly according to claim 6, characterized in that, The distance between adjacent grid line connecting lines is greater than or equal to the distance between two adjacent sub-grid lines.

9. The solar cell assembly according to any one of claims 1-8, characterized in that, The width of the sub-gate line along the first direction is L4, and L4 satisfies: 4μm≤L4≤12μm.

10. A photovoltaic module, characterized in that, The battery cell assembly includes any one of claims 1-9.

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