Battery string, photovoltaic battery and photovoltaic module

Abstract

The utility model discloses a battery string, a photovoltaic battery and a photovoltaic assembly, the battery string comprises a battery piece and a conductive connecting piece, the battery piece is provided with a plurality of grid lines, and the plurality of grid lines extend along a first direction and are arranged at intervals along a second direction; the conductive connecting piece is welded with the plurality of grid lines, and a metal contact layer is formed between the conductive connecting piece and the grid lines. Therefore, the metal contact layer formed between the conductive connecting piece and the grid line can ensure good electrical connection between the conductive connecting piece and the grid line, the conductive performance of the battery string is improved, the contact resistance is reduced, the connection reliability between the conductive connecting piece and the grid line is improved, and the overall structural reliability and stability of the battery string are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic components, in particular to a battery string, a photovoltaic cell and a photovoltaic component. Background Art

[0002] In the existing technology, the main grid-free technology uses a low-temperature solder ribbon with a melting point lower than the lamination temperature. Infrared welding is not performed during interconnection. Instead, the solder ribbon is welded to the battery sub-grid using the temperature during lamination. This will lead to a high number of poor welding between the solder ribbon and the grid line, and the connection strength between the solder ribbon and the grid line is low, resulting in poor structural stability of the battery string. Utility Model Content

[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 string that can improve the overall structural reliability and stability of the battery string.

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

[0005] The third object of the present invention is to provide a photovoltaic assembly, comprising the photovoltaic cell described in the above embodiment.

[0006] According to the embodiment of the first aspect of the present invention, the battery string includes: a battery cell and a conductive connector, wherein a plurality of grid lines are provided on the battery cell, the plurality of grid lines extend along a first direction and are spaced apart along a second direction; the conductive connector is welded to the plurality of grid lines, and a metal contact layer is formed between the conductive connector and the grid lines.

[0007] According to the battery string of the embodiment of the present invention, the metal contact layer formed between the conductive connector and the grid line can ensure a good electrical connection between the conductive connector and the grid line, which helps to improve the conductive performance of the battery string and reduce the contact resistance, thereby improving the reliability of the connection between the conductive connector and the grid line, and thus improving the overall structural reliability and stability of the battery string.

[0008] In some embodiments, the conductive connector includes: a conductive part and a welding layer, the welding layer is arranged on the outer peripheral side of the conductive part, the welding layer is welded to the gate line, and the metal contact layer includes at least part of the welding layer and at least part of the gate line.

[0009] In some embodiments, the system further includes: an adhesive member, which is provided on a side of the conductive connecting member away from the battery cell, and connects the conductive connecting member and the battery cell.

[0010] In some embodiments, the adhesive and the conductive connector are opposite to each other along the thickness direction of the battery string, and the adhesive extends along the second direction; and / or, the adhesive is arranged at intervals along the second direction, and the two ends of the adhesive along the first direction are respectively in contact with the battery cell, and the first direction and the second direction are perpendicular.

[0011] In some embodiments, the length of the adhesive along the second direction is L1, the distance between the edges of the two battery cells at the end of the battery string along the second direction away from each other is L2, and L1 and L2 satisfy: 1mm≤L2-L1≤10mm.

[0012] In some embodiments, the length of the adhesive along the first direction is L3, and L3 satisfies: 1 mm ≤ L3 ≤ 6 mm.

[0013] In some embodiments, the adhesive member is disposed on the conductive connecting member and is located between two adjacent gate lines.

[0014] In some embodiments, the length of the adhesive along the first direction is L4, and L4 satisfies: 0.3mm≤L4≤3mm; and / or the length of the adhesive along the second direction is L5, and L5 satisfies: 0.5mm≤L5≤3mm.

[0015] In some embodiments, along the thickness direction of the battery string, the height of the adhesive is H, the diameter of the conductive connector is h, and H and h satisfy: 0.005 mm ≤ Hh ≤ 0.15 mm.

[0016] In some embodiments, the adhesive is a thermosetting adhesive.

[0017] In some embodiments, the plurality of gate lines include: at least one edge gate line, the edge gate line is arranged adjacent to the edge of the battery cell along the first direction, the edge gate line includes: a plurality of gate line segments and connecting gate lines, the plurality of gate line segments are arranged at intervals along the second direction; the two ends of the connecting gate line are respectively connected to two adjacent gate line segments, and the connecting gate line is bent along the first direction toward the direction away from the corresponding edge of the battery cell.

[0018] In some embodiments, the gate line includes a first connecting segment and a second connecting segment, the first connecting segment and the second connecting segment are connected, the cross-sectional area of ​​the first connecting segment is greater than or equal to the cross-sectional area of ​​the second connecting segment, and the conductive connecting member is welded to the first connecting segment.

[0019] The photovoltaic cell according to the second embodiment of the present invention includes the cell string according to the first embodiment of the present invention.

[0020] The photovoltaic assembly according to the embodiment of the third aspect of the present invention includes the photovoltaic cell according to the embodiment of the second aspect of the present invention.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is a schematic diagram of a battery string according to an embodiment of the present utility model;

[0024] Figure 2 is a schematic cross-sectional view of a battery string according to an embodiment of the present utility model;

[0025] Figure 3 is a cross-sectional schematic diagram of another embodiment of a battery string according to an embodiment of the present utility model;

[0026] Figure 4 is a schematic diagram of a first embodiment of an adhesive member according to an embodiment of the present utility model;

[0027] Figure 5 is a schematic diagram of a second embodiment of an adhesive member according to an embodiment of the present utility model;

[0028] Figure 6 is a schematic diagram of a third embodiment of an adhesive member according to an embodiment of the present utility model;

[0029] Figure 7 is a schematic diagram of a fourth embodiment of an adhesive member according to an embodiment of the present utility model;

[0030] Figure 8 It is a schematic diagram of a fifth embodiment of the adhesive component according to the embodiment of the present utility model.

[0031] Reference numerals:

[0032] 100. Battery string;

[0033] 10. Cell; 11. Gate line; 12. Conductive connector; 121. Conductive portion; 122. Welding layer; 13. Metal contact layer; 14. Adhesive;

[0034] A, first direction; B, second direction; C, thickness direction. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-8 The battery string 100 according to an embodiment of the present invention includes: a battery cell 10 and a conductive connector 12.

[0036] Specifically, if Figures 1-8 As shown, a plurality of gate lines 11 are provided on the battery cell 10, and the plurality of gate lines 11 extend along a first direction A and are spaced apart along a second direction B; a conductive connector 12 is welded to the plurality of gate lines 11, and a metal contact layer 13 is formed between the conductive connector 12 and the gate lines 11.

[0037] Combine Figures 1-8 The cell 10 is the basic unit of the cell string 100, used to receive sunlight and convert light energy into electrical energy. A plurality of grid lines 11 are provided on at least one side of the cell 10 along its thickness direction C. The grid lines 11 are used to collect and conduct the current generated by the cell 10. Conductive connectors 12 are used to connect adjacent cells 10 through their grid lines 11 to form a continuous current path.

[0038] According to the battery string 100 of the embodiment of the present invention, the metal contact layer 13 formed between the conductive connector 12 and the gate line 11 can ensure a good electrical connection between the conductive connector 12 and the gate line 11, which helps to improve the conductivity of the battery string 100 and reduce the contact resistance, thereby improving the reliability of the connection between the conductive connector 12 and the gate line 11, and thus improving the overall structural reliability and stability of the battery string 100.

[0039] According to some embodiments of the present invention, Figure 2 and Figure 3 As shown, the conductive connector 12 includes: a conductive portion 121 and a welding layer 122. The welding layer 122 is arranged on the outer peripheral side of the conductive portion 121. The welding layer 122 is welded to the gate line 11. The metal contact layer 13 includes at least part of the welding layer 122 and at least part of the gate line 11.

[0040] Conductive portion 121 is the primary component of conductive connector 12 and is suitable for connecting different battery cells 10 to facilitate the smooth flow of current. Welding layer 122 is located on the outer periphery of conductive portion 121 and forms a secure connection with grid lines 11 during the welding process. Metal contact layer 13 is located between conductive connector 12 and grid lines 11 and is comprised of at least a portion of welding layer 122 and at least a portion of grid lines 11. This means that after welding, metal contact layer 13 is formed by melting at least a portion of grid lines 11 and at least a portion of welding layer 122, which then cools and solidifies into a single unit.

[0041] Thus, the function of the conductive connector 12 is to connect adjacent cells 10 to form a continuous current path. The contact layer helps achieve a good welding effect with the gate line 11, ensuring a stable and reliable connection. The metal contact layer 13 ensures good electrical contact between the conductive connector 12 and the gate line 11, reducing the resistance at the contact point, improving the current transmission efficiency, and effectively enhancing the stability of the connection between the conductive connector 12 and the gate line 11.

[0042] According to some embodiments of the present invention, Figure 4-Figure 7 As shown, it also includes: an adhesive member 14, which is arranged on a side of the conductive connector 12 away from the battery cell 10, and connects the conductive connector 12 and the battery cell 10.

[0043] The adhesive 14 can further fix the conductive connector 12 on the surface of the battery cell 10 along the thickness direction C thereof. The adhesive 14 is used to strengthen the physical connection between the conductive connector 12 and the battery cell 10 to ensure the structural stability of the entire battery string 100 .

[0044] Therefore, by welding the conductive connector 12 to the grid line 11 and combining it with the adhesive 14, the connection strength between the conductive connector 12 and the battery cell 10 can be further enhanced, and the ability of the battery string 100 to withstand external mechanical stress can be improved. This helps prevent the connection between the conductive connector 12 and the battery cell 10 from loosening or breaking, ensuring that the battery string 100 can maintain good electrical and mechanical properties under various environmental conditions, thereby improving the structural stability and durability of the entire battery string 100.

[0045] According to some embodiments of the present invention, Figure 4-Figure 7 As shown, the adhesive member 14 and the conductive connecting member 12 are opposite to each other along the thickness direction C of the battery string 100, and the adhesive member 14 extends along the second direction B. Figure 4 and Figure 6 As shown, the conductive connector 12 extends along the second direction B, that is, the adhesive 14 is arranged in the same manner as the conductive connector 12, the grid line 11 extends along the first direction A on the battery cell 10, and the adhesive 14 is provided on the side of the conductive connector 12 away from the battery cell 10 along the thickness direction C of the battery cell 10 to cover the conductive connector 12 and fix the conductive connector 12 on the battery cell 10. The same adhesive 14 is connected to the conductive connectors 12 at corresponding positions on multiple battery cells 10, that is, the adhesive 14 can be a continuous strip structure or a sheet structure; or, the adhesive 14 is arranged at intervals along the second direction B, and the two ends of the adhesive 14 along the first direction A are respectively in contact with the battery cell 10, and the first direction A and the second direction B are perpendicular, as shown in FIG. Figure 5 and Figure 7As shown, the adhesive 14 is not continuous, but is arranged at intervals along the second direction B. The width of the adhesive 14 in the first direction A is greater than the width of the conductive connector 12, so that the adhesive 14 can cover the conductive connector 12 while ensuring direct contact with the battery cell 10, that is, the adhesive 14 is a strip structure or a sheet structure arranged at intervals; or, in some embodiments, the adhesive 14 on some battery cells 10 in the battery string 100 extends along the second direction B, and the adhesive 14 on some battery cells 10 is arranged at intervals along the second direction B.

[0046] Therefore, the provision of the adhesive 14 can increase the stability of the physical connection between the conductive connector 12 and the battery cell 10, enhance the adhesion between the adhesive 14 and the battery cell 10, and prevent the conductive connector 12 from being displaced or falling off during long-term use. Moreover, one adhesive 14 can cover the conductive connectors 12 on multiple battery cells 10 to ensure the connection stability and consistency of the entire battery string 100.

[0047] According to some embodiments of the present invention, Figure 4-Figure 7 As shown, the length of the adhesive 14 along the second direction B is L1, and the distance between the edges of two battery cells 10 at the end of the battery string 100 along the second direction B is L2, and L1 and L2 satisfy: 1mm≤L2-L1≤10mm.

[0048] That is, the length of the adhesive 14 in the second direction B is shorter than the length between the edges of two battery cells 10 at the end of the battery string 100 along the second direction B and away from each other by 1 mm to 10 mm.

[0049] Therefore, the length of the adhesive 14 is designed to be shorter than the total length between the two battery cells 10 at the ends of the battery string 100, which can ensure that the adhesive 14 can cover the conductive connector 12 and contact the battery cell 10, but will not exceed the two ends of the battery string 100, thereby ensuring good adhesion between the adhesive 14 and the battery cell 10, maintaining the overall appearance of the battery string 100, reducing the material used for the adhesive 14, and reducing the production cost of the battery string 100.

[0050] According to some embodiments of the present invention, Figure 4-Figure 7 As shown, the length of the adhesive member 14 along the first direction A is L3, and L3 satisfies: 1 mm ≤ L3 ≤ 6 mm.

[0051] If the length of the adhesive 14 in the first direction A is less than 1 mm, the length of the adhesive 14 in the first direction A is too short, and the adhesive 14 cannot completely cover the conductive connector 12. Moreover, the contact area between the adhesive 14 and the battery cell 10 is too small, resulting in a poor connection between the adhesive 14 and the battery cell 10. If the length of the adhesive 14 in the second direction B is greater than 6 mm, the length of the adhesive 14 in the first direction A is too long, resulting in excessive material consumption for the adhesive 14, which is not conducive to reducing the production cost of the battery string 100.

[0052] Therefore, limiting the length direction of the adhesive 14 in the first direction A can ensure that the adhesive 14 can effectively cover the conductive connector 12 and contact the battery cell 10, providing a sufficient bonding range to ensure a stable connection between the conductive connector 12 and the battery cell 10, thereby improving the overall structural stability of the battery string 100, and optimizing the use of the adhesive 14, avoiding unnecessary waste, and ensuring the economy and practicality of the battery string 100.

[0053] According to some embodiments of the present invention, Figure 8 As shown, the adhesive member 14 is disposed on the conductive connecting member 12 and is located between two adjacent gate lines 11 .

[0054] In some embodiments, the adhesive 14 is in the form of a dot structure, multiple adhesives 14 are distributed in the gap between two adjacent gate lines 11, multiple adhesives 14 are arranged on the conductive connector 12, and multiple adhesives 14 are arranged at intervals along the extension direction of the conductive connector 12.

[0055] Therefore, the primary function of adhesive 14 is to secure conductive connector 12 to cell 10, strengthening the physical connection between conductive connector 12 and cell 10 and improving the structural stability of the entire battery string 100. Adhesive 14 is positioned between two adjacent grid lines 11. This precise positioning helps ensure that adhesive 14 does not affect the function of grid lines 11 while ensuring stable fixation of conductive connector 12. Adhesive 14 using a dotted structure can save material compared to a continuous tape while achieving the same fixing effect.

[0056] According to some embodiments of the present invention, Figure 8 As shown, the length of the adhesive 14 along the first direction A is L4, and L4 satisfies: 0.3mm≤L4≤3mm; or, the length of the adhesive 14 along the second direction B is L5, and L5 satisfies: 0.5mm≤L5≤3mm, or, the length L4 of the adhesive 14 in the first direction A and the length in the second direction B both satisfy: 0.3mm≤L4≤3mm, 0.5mm≤L5≤3mm.

[0057] Thus, limiting the length of the adhesive 14 in the first direction A and the second direction B ensures that the adhesive 14 can effectively cover the conductive connector 12 and contact the battery cell 10, providing a sufficient bonding range to ensure a stable connection between the conductive connector 12 and the battery cell 10. Limiting the length of the adhesive 14 along the first direction A and the second direction B helps optimize the use of the adhesive 14, avoids unnecessary waste, and also ensures the cost-effectiveness and practicality of the adhesive 14.

[0058] According to some embodiments of the present invention, Figure 2 and Figure 3 As shown, along the thickness direction C of the battery string 100 , the height of the adhesive member 14 is H, and the diameter of the conductive connector 12 is h, and H and h satisfy: 0.005 mm ≤ Hh ≤ 0.15 mm.

[0059] That is, the height of the adhesive 14 is slightly higher than the diameter of the conductive connector 12. Therefore, the height of the adhesive 14 is designed to be slightly higher than the diameter of the conductive connector 12, ensuring that the adhesive 14 can cover the conductive connector 12 and make contact with the battery cells 10, but not so high as to affect the overall structure of the battery string 100. By controlling the height of the adhesive 14, it can be avoided that the adhesive 14 is too high, which helps maintain the overall aesthetics of the battery string 100 and reduces the risk of possible mechanical damage. The appropriate height difference ensures good adhesion between the adhesive 14 and the battery cells 10, thereby improving the structural stability of the entire battery string 100.

[0060] According to some embodiments of the present invention, Figure 3 As shown, the adhesive 14 is a thermosetting adhesive.

[0061] A thermosetting adhesive is an adhesive that forms an irreversible chemical cross-linking network during the curing process. Thermosetting adhesive has good high-temperature stability and can maintain its performance at higher temperatures. Thermosetting adhesive has good weather resistance and can resist the influence of ultraviolet rays and other environmental factors. After curing, the thermosetting adhesive can provide strong adhesion to ensure a stable connection between the adhesive 14 and the battery cell 10. Thermosetting adhesives generally have good chemical resistance and can resist the influence of some corrosive substances. The mechanical strength of the thermosetting adhesive after curing is high, which helps to improve the structural stability of the entire battery string 100.

[0062] Therefore, the adhesive 14 is a thermosetting adhesive, which improves the stability of the battery string 100 and ensures the durability of the battery string 100 under various environmental conditions. The high-strength connection formed after the thermosetting adhesive is cured helps to improve the mechanical strength of the entire battery string 100, and the weather resistance of the thermosetting adhesive helps to extend the service life of the battery string 100.

[0063] According to some embodiments of the present invention, multiple gate lines 11 include: at least one edge gate line, the edge gate line is arranged along the first direction A adjacent to the edge of the battery cell 10, the edge gate line includes: multiple gate line segments and connecting gate lines, the multiple gate line segments are arranged at intervals along the second direction B; the two ends of the connecting gate line are respectively connected to two adjacent gate line segments, and the connecting gate line is bent along the first direction A toward the direction away from the corresponding edge of the battery cell 10.

[0064] Therefore, the setting of the edge grid line can increase the distance between the conductive connector 12 and the edge of the battery cell 10, shorten the length of the conductive connector 12, reduce the requirements for the processing accuracy of the conductive connector 12, and avoid the problem of the conductive connector 12 being too close to the edge of the battery cell 10, which may cause the battery cell 10 to crack during lamination.

[0065] According to some embodiments of the present invention, the gate line 11 includes a first connecting segment and a second connecting segment, the first connecting segment and the second connecting segment are connected, the cross-sectional area of ​​the first connecting segment is greater than or equal to the cross-sectional area of ​​the second connecting segment, and the conductive connecting member 12 is welded to the first connecting segment.

[0066] Therefore, welding the conductive connector 12 to the first connecting section with a larger area can reduce the difficulty of welding the conductive connector 12 to the gate line 11, ensure the mechanical strength of the connection between the conductive connector 12 and the gate line 11, and improve the overall stability of the battery cell 10.

[0067] The photovoltaic cell according to the second embodiment of the present invention includes the cell string 100 according to the first embodiment of the present invention.

[0068] According to the photovoltaic cell of the embodiment of the present invention, by applying the cell string 100 in the above embodiment, the overall structural stability of the photovoltaic cell 10 can be improved, so that the photovoltaic cell has efficient current collection capability, stable electrical connection and strong mechanical stability, thereby improving the energy conversion efficiency of the photovoltaic cell, enhancing the durability of the photovoltaic cell, and extending the service life of the photovoltaic cell.

[0069] The photovoltaic assembly according to the third embodiment of the present invention includes the photovoltaic cell according to the second embodiment of the present invention.

[0070] Specifically, the preparation process of photovoltaic modules is as follows:

[0071] Combine Figure 1 , alternately lay out the battery cells 10 printed with grid lines 11 and the conductive connectors 12 on the workbench, place the press so that the conductive connectors 12 are in close contact with the battery surface, and when heated, a metal contact layer 13 is formed between the conductive connectors 12 and the grid lines 11. Multiple battery cells 10 are connected through the conductive connectors 12 to form a battery string 100, and the press is removed.

[0072] Combine Figure 4-Figure 8 , an adhesive 14 is laid along the conductive connector 12 on the battery string 100, and the adhesive 14 is adhered to the conductive connector 12 and the battery cell 10 by a pressing mechanism, so that the adhesive 14 wraps around the conductive connector 12 and adheres it to the battery cell 10. Alternatively, a dot of adhesive 14 is applied between the gaps between the grid lines 11 of the battery cell 10, and the adhesive 14 is cured, so that the adhesive 14 wraps around the conductive connector 12 and adheres it to the battery cell 10.

[0073] Flip the cell string 100 and repeat the above steps on the other side of the cell string 100. Perform an EL test on the cell string 100. If any conductive connectors 12 are found to be poorly soldered, the corresponding cell 10 is repaired. Passing the test, the cell string 100 undergoes a lamination step. A first layer of encapsulating film is applied to the glass front panel. The cell string 100 is then arranged and placed on top of the first layer of encapsulating film to prevent the busbars from welding to the conductive connectors 12 at both ends of the cell string 100. A second layer of encapsulating film is then applied to the surface of the cell string 100. A glass or polymer backsheet is then placed on top of the second layer of encapsulating film. The photovoltaic module is then completed through lamination, edge trimming, framing, and junction box installation.

[0074] The photovoltaic module according to the embodiment of the present invention can effectively improve the stability and reliability of the photovoltaic module and extend the service life of the photovoltaic module by applying the photovoltaic cell in the above embodiment.

[0075] 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 to 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0076] 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, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact via another feature between them. In the description of the present invention, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0077] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0078] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery string, characterized in that: include: A battery cell, wherein a plurality of grid lines are provided on the battery cell, wherein the plurality of grid lines extend along a first direction and are spaced apart along a second direction; A conductive connecting member is welded to the plurality of gate lines, and a metal contact layer is formed between the conductive connecting member and the gate lines.

2. The battery string according to claim 1, characterized in that: The conductive connecting member comprises: Conductive part; A welding layer is provided on the outer peripheral side of the conductive portion, the welding layer is welded to the gate line, and the metal contact layer includes at least a portion of the welding layer and at least a portion of the gate line.

3. The battery string according to claim 1, characterized in that: Also includes: An adhesive component is provided on a side of the conductive connecting component away from the battery cell, and the adhesive component connects the conductive connecting component and the battery cell.

4. The battery string according to claim 3, characterized in that: The adhesive member and the conductive connecting member are opposite to each other along the thickness direction of the battery string. The adhesive member extends along the second direction; and / or, The adhesive members are arranged at intervals along the second direction, and both ends of the adhesive members along the first direction are in contact with the battery cells respectively. The first direction is perpendicular to the second direction.

5. The battery string according to claim 4, characterized in that: The length of the adhesive along the second direction is L1, and the distance between the edges of the two battery cells at the end of the battery string along the second direction away from each other is L2. The L1 and L2 satisfy: 1mm≤L2-L1≤10mm.

6. The battery string according to claim 4, characterized in that: The length of the adhesive along the first direction is L3, and L3 satisfies: 1mm≤L3≤6mm.

7. The battery string according to claim 3, characterized in that: The adhesive component is provided on the conductive connecting component and is located between two adjacent gate lines.

8. The battery string according to claim 7, characterized in that: The length of the adhesive along the first direction is L4, and L4 satisfies: 0.3 mm ≤ L4 ≤ 3 mm; and / or, The length of the adhesive along the second direction is L5, and L5 satisfies: 0.5 mm ≤ L5 ≤ 3 mm.

9. The battery string according to claim 7, characterized in that: Along the thickness direction of the battery string, the height of the adhesive is H, and the diameter of the conductive connector is h, and H and h satisfy: 0.005 mm ≤ Hh ≤ 0.15 mm.

10. The battery string according to claim 7, characterized in that: The adhesive is a thermosetting adhesive.

11. The battery string according to claim 1, characterized in that: The plurality of gate lines include: at least one edge gate line, the edge gate line being arranged adjacent to an edge of the cell along the first direction, the edge gate line including: a plurality of gate line segments, wherein the plurality of gate line segments are spaced apart along the second direction; A connecting gate line, wherein both ends of the connecting gate line are respectively connected to two adjacent gate line segments, and the connecting gate line is bent along the first direction toward a direction away from a corresponding edge of the battery cell.

12. The battery string according to any one of claims 1 to 11, characterized in that: The gate line includes a first connecting segment and a second connecting segment, wherein the first connecting segment is connected to the second connecting segment. The cross-sectional area of ​​the first connecting segment is greater than or equal to the cross-sectional area of ​​the second connecting segment, and the conductive connecting member is welded to the first connecting segment.

13. A photovoltaic cell, characterized in that: The method comprises a battery string according to any one of claims 1 to 12.

14. A photovoltaic module, characterized in that: Comprising the photovoltaic cell according to claim 13.

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