Battery string and photovoltaic module

Abstract

The utility model discloses a battery string and a photovoltaic assembly, the battery string comprises a battery, a first adhesive and a first electric connecting piece, the surface of the battery is provided with a plurality of first grid lines and a plurality of second grid lines, the polarity of the second grid lines is opposite to the polarity of the first grid lines, and in a plurality of connecting areas, the first adhesive is connected with the first electric connecting piece. One connecting area closest to the edge of the battery in the first direction is an end connecting area, the first grid line is provided with a first contact part, the first bonding glue is bonded to the end connecting area, the first contact part is exposed out of the first bonding glue, and a first protruding part for insulation is formed at the position, corresponding to at least one second grid line, of the first bonding glue; the first electric connecting piece is bonded to the end connecting area through first bonding glue, the first electric connecting piece is electrically connected with the first contact part in a contact mode, and the at least one second grid line is isolated from the first electric connecting piece through the first protruding part. Therefore, the connection steps of the battery string can be optimized, so that the labor cost and the material cost can be saved.

Description

Technical Field

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

[0002] Currently, in solar cell strings, the solder ribbons heat up when energized, melting the solder on their surface to connect the ribbons to the cells. Related technologies involve soldering cells within a string, first requiring the printing of insulating adhesive and solder paste, and then welding the solder ribbons. This process is cumbersome, increasing the complexity of the string connection, material costs, and labor costs. Consequently, it affects the current collection efficiency of the photovoltaic modules, hindering rapid string installation and limiting the application of photovoltaic modules. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a battery string that simplifies the connection method of battery strings, thereby saving labor and material costs.

[0004] This utility model further proposes a photovoltaic module.

[0005] According to the present invention, a battery string includes: a battery, a first adhesive, and a first electrical connector. The surface of the battery is provided with a plurality of first grid lines and a plurality of second grid lines with opposite polarity to the first grid lines. The plurality of first grid lines and the plurality of second grid lines extend in a first direction and are spaced apart and staggered in a second direction. The first direction and the second direction are perpendicular. The battery is provided with a plurality of connection areas extending in the second direction and spaced apart in the first direction. Among the plurality of connection areas, the connection area closest to the edge of the battery in the first direction is an end connection area. The first grid lines are provided with first contact portions. The first adhesive is bonded to the end connection area, and the first contact portions are exposed from the first adhesive. The first adhesive forms a first protrusion for insulation at the position corresponding to at least one second grid line. The first electrical connector is bonded to the end connection area by the first adhesive. The first electrical connector and the first contact portion are electrically connected in contact. At least one second grid line is insulated from the first electrical connector through the first protrusion.

[0006] According to the present invention, the battery string is provided with multiple first grid lines and multiple second grid lines on the surface of the battery, and multiple connection areas are provided on the battery. A first contact part is provided at the position of the first grid line corresponding to the end connection area. A first electrical connector is provided in the end connection area by a first adhesive. This not only enables the first electrical connector to be electrically connected to the first contact part, but also optimizes the connection steps of the battery string, thereby saving labor and material costs.

[0007] In some examples of this invention, the first electrical connector forms the recess on its side adjacent to the battery, and the first protrusion mates with the recess.

[0008] In some examples of this invention, the first electrical connector forms a second protrusion on its side away from the battery; and / or, both the first protrusion and the recess are correspondingly arc-shaped.

[0009] In some examples of this utility model, a portion of the plurality of second grid lines passes through the end connection area and corresponds to the first protrusion, and another portion of the plurality of second grid lines is provided with a first break at the position corresponding to the end connection area. The other portion of the plurality of second grid lines is insulated from the first electrical connector through the first break.

[0010] In some examples of this utility model, the first adhesive includes: a first adhesive layer and a second adhesive layer, the first adhesive layer being disposed on the battery and covering the portion of the second grid line located in the end connection area, the second adhesive layer being disposed on the battery and located around the first grid line and the first adhesive layer, the first contact portion being exposed from the second adhesive layer, and the portion of the first adhesive layer protruding from the second adhesive layer being the first protrusion.

[0011] In some examples of this invention, the maximum thickness of the first protrusion is greater than the maximum thickness of the portion of the first adhesive layer located on both sides of the first protrusion.

[0012] In some examples of this utility model, in the end connection area, the height of the first grid line is h1, the height of the second grid line is h2, the maximum thickness of the first protrusion is h3, and h1, h2 and h3 satisfy the relationship: 0.3h2≤h3≤h1=h2.

[0013] In some examples of this utility model, among the multiple connection areas, the connection area whose distance to the edge of the battery in the first direction is greater than that of the end connection area is a middle connection area. One of the first grid line and the second grid line is provided with a second contact portion corresponding to the position of the middle connection area, and the other is provided with a second break corresponding to the position of the middle connection area. The battery string further includes: a second adhesive and a second electrical connector. The second adhesive is bonded to the middle connection area, the second contact portion is exposed from the second adhesive, the second electrical connector is bonded to the second connection area through the second adhesive, the second electrical connector and the second contact portion are electrically connected in contact, and the other of the first grid line and the second grid line is insulated from the second electrical connector through the second break.

[0014] In some examples of this utility model, the plurality of central connection areas include first central connection areas and second central connection areas arranged alternately. In the first central connection area, the first grid line is provided with a second contact portion and the second grid line is provided with a second break. In the second central connection area, the second grid line is provided with a second contact portion and the first grid line is provided with a second break.

[0015] The photovoltaic module according to this utility model includes: the battery string described above.

[0016] Compared with the prior art, the present invention adopts a method in which multiple first grid lines and multiple second grid lines are set on the surface of the battery, multiple connection areas are set on the battery, a first contact part is set at the position of the first grid line corresponding to the end connection area, and a first electrical connector is set in the end connection area by a first adhesive. This not only enables the first electrical connector to be electrically connected to the first contact part, but also optimizes the connection steps of the battery string, thereby saving labor and material costs.

[0017] 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

[0018] 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:

[0019] Figure 1 This is a partial structural schematic diagram of the battery string according to an embodiment of the present utility model;

[0020] Figure 2 This is the first method in which the first electrical connector is placed on the battery;

[0021] Figure 3 This is the second method where the first electrical connector is placed on the battery;

[0022] Figure 4 This is step one of connecting the battery string;

[0023] Figure 5 This is step two of connecting the battery string;

[0024] Figure 6 This is step three of connecting the battery string;

[0025] Figure label:

[0026] 10. Battery; 11. First grid line; 12. Second grid line; 13. End connection area; 14. First break; 15. Middle connection area; 16. Second break; 17. First contact part; 20. First adhesive; 21. First protrusion; 22. First adhesive layer; 23. Second adhesive layer; 30. First electrical connector; 31. Recess; 32. Second protrusion. Detailed Implementation

[0027] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0028] The following is for reference. Figures 1-6 This invention describes a battery string according to an embodiment of the present invention, which is used in a photovoltaic module. For example, a fully back-contact crystalline silicon photovoltaic cell.

[0029] like Figures 1-3 As shown, the battery string according to this utility model includes: a battery 10, a first adhesive 20, and a first electrical connector 30. The surface of the battery 10 is provided with a plurality of first grid lines 11 and a plurality of second grid lines 12 with opposite polarity to the first grid lines 11. The plurality of first grid lines 11 and the plurality of second grid lines 12 extend in a first direction and are spaced apart and staggered in a second direction. The battery 10 is provided with a plurality of connection areas extending along the second direction. Among the plurality of connection areas, the connection area closest to the edge of the battery 10 in the first direction is the end connection area 1. 3. The first grid line 11 is provided with a first contact portion 17. The first adhesive 20 is bonded to the end connection area 13. The first contact portion 17 is exposed from the first adhesive 20. The first adhesive 20 forms a first protrusion 21 for insulation at the position corresponding to at least one second grid line 12. The first electrical connector 30 is bonded to the end connection area 13 by the first adhesive 20. The first electrical connector 30 and the first contact portion 17 are electrically connected in contact. At least one second grid line 12 is insulated from the first electrical connector 30 by the first protrusion 21.

[0030] It is understood that the battery 10, the first adhesive 20, and the first electrical connector 30 constitute the main structure of the battery string. The surface of the battery 10 is provided with multiple first grid lines 11 and multiple second grid lines 12. The multiple first grid lines 11 extend in a first direction, thereby ensuring that the current is evenly distributed throughout the battery string. This arrangement can increase the current transfer power between battery strings and reduce current concentration, thereby improving the stability of the battery string. Moreover, the multiple first grid lines 11 can share the current load, thereby reducing the resistance of individual welding points or connections, as well as reducing the overall resistance and energy loss. The multiple second grid lines 12 also extend in the first direction, thereby ensuring that the current is evenly distributed throughout the battery string. This arrangement can increase the current transfer power between battery strings and reduce current concentration, thereby improving the stability of the battery string.

[0031] Furthermore, the multiple first grid lines 11 and multiple second grid lines 12 are alternately arranged in the second direction. This allows the first grid lines 11 and second grid lines 12 with opposite polarities to be alternately arranged, ensuring that the current is evenly distributed throughout the entire battery string. This arrangement allows for greater current transfer power between battery strings and reduces current concentration, thereby improving the stability of the battery string. For example, the first grid line 11 can be the positive electrode, and the second grid line 12 can be the negative electrode. The alternating arrangement of the first grid lines 11 and second grid lines 12 ensures the power transfer of current between battery strings.

[0032] In addition, the surface of the battery 10 is provided with multiple connection areas, which extend along the second direction and are spaced apart along the first direction. Among the multiple connection areas, the one located at the end is the end connection area 13. The end connection area 13 is provided with a first contact portion 17 at the position corresponding to the first grid line 11. The first contact portion 17 can be electrically connected to the first electrical connector 30, thereby forming an electrical connection between the batteries 10 and improving the power generation efficiency of the battery string. For example, the first electrical connector 30 is a solder strip, which facilitates the electrical connection between the first contact portion 17 and the first electrical connector 30.

[0033] Furthermore, the first adhesive 20 is located in the end connection area 13, and the first contact portion 17 is exposed from the first adhesive 20. This arrangement facilitates the first adhesive 20 to limit the first electrical connector 30 and also allows the first electrical connector 30 to be firmly connected to the end connection area 13, thereby optimizing the connection steps of the battery string and saving labor and material costs. The first adhesive 20 forms a first protrusion 21 at the corresponding end connection area 13 of at least one second grid line 12. The first protrusion 21 covers the second grid line 12. This arrangement allows the first protrusion 21 to insulate between the first adhesive 20 and the second grid line 12, and also ensures that the current is evenly distributed throughout the entire battery string, thereby increasing the current transfer power between battery strings and reducing current concentration, thus improving the stability of the battery string.

[0034] Specifically, a first adhesive 20 is provided between the first electrical connector 30 and the end connection area 13, thereby making the connection between the first electrical connector 30 and the battery 10 more secure. Moreover, the first electrical connector 30 is electrically connected to the first contact portion 17 in a contact manner, thereby ensuring the stability of the connection between the first electrical connector 30 and the first grid line 11. A first protrusion 21 is provided between at least one second grid line 12 and the first electrical connector 30, thereby making the first protrusion 21 insulate the first adhesive 20 and the second grid line 12, thereby ensuring that the current is evenly distributed throughout the entire battery string.

[0035] Therefore, by setting multiple first grid lines 11 and multiple second grid lines 12 on the surface of the battery 10, and setting multiple connection areas on the battery 10, a first contact portion 17 is set at the position of the first grid line 11 corresponding to the end connection area 13, and the first electrical connector 30 is set in the end connection area 13 by the first adhesive 20, not only can the first electrical connector 30 be electrically connected to the first contact portion 17, but the connection steps of the battery string can also be optimized, thereby saving labor costs and material costs.

[0036] Among them, such as Figures 4-6 As shown, the first electrical connector 30 has a recess 31 formed on its side adjacent to the battery 10, and the first protrusion 21 mates with the recess 31. It can be understood that the recess 31 formed at the connection point between the first electrical connector 30 and the side of the battery 10, and the first protrusion 21 mates with the recess 31, facilitates the bonding of the first electrical connector 30 to the first adhesive 20. This arrangement optimizes the connection method between the first electrical connector 30 and the battery 10, thereby simplifying the battery string connection steps.

[0037] In addition, such as Figures 4-6As shown, the first electrical connector 30 forms a second protrusion 32 on its side away from the battery 10; both the first protrusion 21 and the recess 31 are correspondingly arc-shaped. That is, the first electrical connector 30 forms a second protrusion 32 on its side away from the battery 10, which facilitates the first electrical connector 30 to electrically connect multiple batteries 10, thereby improving the power generation efficiency of the battery string and thus improving the yield of photovoltaic modules. The first protrusion 21 and the recess 31 are correspondingly arc-shaped, which facilitates the connection of the first protrusion 21 and the recess 31, thereby facilitating the bonding of the first electrical connector 30 with the first adhesive 20. This design optimizes the connection method between the first electrical connector 30 and the battery 10, thereby simplifying the connection steps of the battery string.

[0038] In addition, such as Figures 4-6 As shown, a portion of the plurality of second grid lines 12 passes through the end connection area 13 and has a corresponding first protrusion 21. Another portion of the plurality of second grid lines 12 has a first break 14 at the position corresponding to the end connection area 13. The other portion of the plurality of second grid lines 12 is insulated from the first electrical connector 30 through the first break 14.

[0039] It is understood that the second grid line 12 extends along the first direction, and the end connection area 13 extends along the second direction. A first break 14 is provided at the intersection of a part of the second grid line 12 and the end connection area 13, so that the second grid line 12 can be segmented along the first direction. This not only facilitates the collection of current by the second grid line 12, but also allows the first adhesive 20 to be filled in the first break 14, thereby facilitating the bonding of the first adhesive 20 to the first electrical connector 30, and thus facilitating the connection of the first electrical connector 30 to the battery 10. Moreover, another part of the second grid line 12 can also be insulated from the first electrical connector 30 through the first break 14. This arrangement can ensure that the second grid line 12 and the first electrical connector 30 are insulated, thereby optimizing the connection method between the first electrical connector 30 and the battery 10, thereby optimizing the connection steps of the battery string, and saving labor and material costs.

[0040] In addition, such as Figure 4 and Figure 6 As shown, the first adhesive 20 includes a first adhesive layer 22 and a second adhesive layer 23. The first adhesive layer 22 is disposed on the battery 10 and covers the portion of the second grid line 12 located at the end connection area 13. The second adhesive layer 23 is disposed on the battery 10 and is located around the first grid line 11 and the first adhesive layer 22. The first contact portion 17 is exposed from the second adhesive layer 23. The portion of the first adhesive layer 22 that protrudes from the second adhesive layer 23 is the first protrusion.

[0041] In other words, the first adhesive layer 22 and the second adhesive layer 23 constitute the main structure of the first adhesive 20. The first adhesive layer 22 is disposed on the part of the second grid line 12 near the end connection area 13, so that the first adhesive layer 22 can connect the second grid line 12 and the first electrical connector 30. The second adhesive layer 23 is located around the first grid line 11 and the first adhesive layer 22, and the second adhesive layer 23 is located on the battery 10, so that the second adhesive layer 23 can provide insulation protection for the second grid line 12. The first contact part 17 is exposed from the second adhesive layer 23, so that the connection between the first electrical connector 30 and the first grid line 11 can be guaranteed to be stable. The part of the first adhesive layer 22 that protrudes from the second adhesive layer 23 is the first protrusion 21, so that the first protrusion 21 can insulate the first adhesive 20 and the second grid line 12, thereby ensuring that the current is evenly distributed throughout the entire battery string.

[0042] In particular, such as Figure 4 and Figure 6 As shown, the maximum thickness of the first protrusion is greater than the maximum thickness of the portion of the first adhesive layer 22 located on both sides of the first protrusion. This arrangement can insulate the first protrusion 21 from the first adhesive 20 and the second grid line 12, and also ensure that the current is evenly distributed throughout the entire battery string. This allows for greater current transfer power between battery strings, reduces current concentration, and improves the stability of the battery string.

[0043] Optionally, such as Figure 1 As shown, in the end connection area 13, the height of the first grid line 11 is h1, the height of the second grid line 12 is h2, and the maximum thickness of the first protrusion is h3. h1, h2, and h3 satisfy the relationship: 0.3h2≤h3≤h1=h2. It can be understood that the first grid line 11 and the second grid line 12 extend along a first direction, and the connection area extends along a second direction. The position where the second grid line 12 intersects the connection area is lower in height than the position where the first grid line 11 intersects the connection area. This arrangement can improve the current collection capability of the battery 10 and ensure that the current is evenly distributed throughout the entire battery string, thereby increasing the current transfer power between battery strings and reducing current concentration, thus improving the stability of the battery string.

[0044] In addition, such as Figure 1As shown, among the multiple connection areas, the connection area with a distance greater than the end connection area 13 from the edge of the battery 10 in the first direction is the middle connection area 15. One of the first grid line 11 and the second grid line 12 is provided with a second contact portion at a position corresponding to the middle connection area 15, and the other is provided with a second break 16 at a position corresponding to the middle connection area 15. The battery string also includes: a second adhesive and a second electrical connector. The second adhesive is bonded to the middle connection area 15, and the second contact portion is exposed from the second adhesive. The second electrical connector is bonded to the second connection area through the second adhesive. The second electrical connector and the second contact portion are electrically connected in contact. The other of the first grid line 11 and the second grid line 12 is insulated from the second electrical connector through the second break 16.

[0045] In other words, a central connection area 15 is provided on the surface of the battery 10. The central connection area 15 is a connection area other than the end connection area 13. The central connection area 15 extends along the second direction. The central connection area 15 and the end connection area 13 are spaced apart in the first direction. A second contact portion is provided at a position corresponding to one of the first grid line 11 and the second grid line 12 in the central connection area 15. A second break 16 is provided at a position corresponding to the other of the first grid line 11 and the second grid line 12 in the central connection area 15. The second contact portion can be electrically connected to the second electrical connector. The positive and negative polarities of the second electrical connector are alternately arranged, so that an electrical connection can be formed between the batteries 10, thereby improving the power generation efficiency of the battery string. Moreover, the second break 16 not only facilitates the collection of current by the first grid line 11 or the second grid line 12, but also allows the second adhesive to fill the second break 16, thereby facilitating the second adhesive to bond the second electrical connector, and thus facilitating the connection of the second electrical connector to the battery 10. For example, the second electrical connector is a solder strip, which facilitates the electrical connection between the second contact portion and the second electrical connector. In the first direction, the second electrical connector at the first central connection area 15 is first connected to the second grid line 12, and the second electrical connector at the second central connection area 15 is connected to the first grid line 11. In this way, the second electrical connectors with different polarities are staggered, so that the first grid line 11 and the second grid line 12 can be connected to the second electrical connectors of the corresponding polarities.

[0046] The second adhesive is located in the central connection area 15, and the second contact portion is exposed from the second adhesive. This arrangement facilitates the second adhesive to limit the second electrical connector and also allows the second electrical connector to be firmly connected to the central connection area 15. This optimizes the connection steps of the battery string, thereby saving labor and material costs. Moreover, the second electrical connector is insulated from the first grid line 11 by the second adhesive. This arrangement ensures that the current is evenly distributed throughout the battery string. This arrangement allows for greater current transfer power between battery strings and reduces current concentration, thereby improving the stability of the battery string.

[0047] In addition, such as Figure 1 As shown, the plurality of central connection areas 15 include a first central connection area and a second central connection area arranged at intervals and in an alternating manner. In the first central connection area, the first grid line 11 is provided with a second contact portion and the second grid line 12 is provided with a second break 16. In the second central connection area, the second grid line 12 is provided with a second contact portion and the first grid line 11 is provided with a second break 16.

[0048] It is understood that the first and second central connection areas are spaced apart along the first direction to facilitate the connection of the second electrical connector to the battery 10. In the first central connection area, the first grid line 11 is provided with a second contact portion and the second grid line 12 is provided with a second break 16. In the second central connection area, the second grid line 12 is provided with a second contact portion and the first grid line 11 is provided with a second break 16. This arrangement facilitates the electrical connection between the second contact portion and the second electrical connector. The second adhesive fills the second break 16 to facilitate the second adhesive bonding of the second electrical connector and to enable the batteries 10 to form an electrical connection, thereby improving the power generation efficiency of the battery string.

[0049] Specifically, such as Figures 4-6 As shown, the welding method of battery 10 is as follows: the welding position is near the edge of battery 10 in the first direction. First, insulating glue is applied to the second grid line 12 and the insulating glue is allowed to cure. Then, first adhesive 2020 is applied to the end connection area 13 and second adhesive is applied to the middle connection area 15. Then, the first electrical connector 30 is pressed down with an arch or without an arch, and the first electrical connector 30 squeezes out the first adhesive 20. Similarly, the second electrical connector is pressed down with an arch or without an arch, and the second electrical connector squeezes out the second adhesive. Finally, the battery string is cured.

[0050] The photovoltaic module according to this utility model includes: a battery string as described in the above embodiments. By providing a plurality of first grid lines 11 and a plurality of second grid lines 12 on the surface of the battery 10, and providing a plurality of connection areas on the battery 10, a first contact portion 17 is provided at the position of the first grid line 11 corresponding to the end connection area 13, and a first electrical connector 30 is provided in the end connection area 13 by means of a first adhesive 20. This not only enables the first electrical connector 30 to be electrically connected to the first contact portion 17, but also optimizes the connection steps of the battery string, thereby saving labor and material costs.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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 string, characterized in that, include: A battery (10) has a plurality of first grid lines (11) and a plurality of second grid lines (12) with opposite polarity to the first grid lines (11) on its surface. The plurality of first grid lines (11) and the plurality of second grid lines (12) extend in a first direction and are spaced apart and staggered in a second direction. The first direction and the second direction are perpendicular. The battery (10) has a plurality of connection areas that extend in the second direction and are spaced apart in the first direction. Among the plurality of connection areas, the connection area closest to the edge of the battery (10) in the first direction is the end connection area (13). The first grid line (11) has a first contact portion (17). A first adhesive (20) is bonded to the end connection area (13), and a first contact portion (17) is exposed from the first adhesive (20). The first adhesive (20) forms a first protrusion (21) for insulation at the position corresponding to at least one second grid line (12). The first electrical connector (30) is bonded to the end connection area (13) by the first adhesive (20), the first electrical connector (30) is electrically connected to the first contact portion (17) in a contact manner, and at least one second grid line (12) is insulated from the first electrical connector (30) by the first protrusion (21).

2. The battery string according to claim 1, characterized in that, The first electrical connector (30) has a recess (31) formed on its side adjacent to the battery (10), and the first protrusion (21) mates with the recess (31).

3. The battery string according to claim 2, characterized in that, The first electrical connector (30) forms a second protrusion (32) on its side away from the battery (10); and / or, The first protrusion (21) and the recess (31) are both arc-shaped.

4. The battery string according to claim 1, characterized in that, A portion of the plurality of second grid lines (12) passes through the end connection area (13) and corresponds to the first protrusion (21), and another portion of the plurality of second grid lines (12) is provided with a first break (14) at the position corresponding to the end connection area (13), and the other portion of the plurality of second grid lines (12) is insulated from the first electrical connector (30) through the first break (14).

5. The battery string according to claim 1, characterized in that, The first adhesive (20) comprises: A first adhesive layer (22) is disposed on the battery (10) and covers the portion of the second grid line (12) located in the end connection area (13); The second adhesive layer (23) is disposed on the battery (10) and located around the first grid line (11) and the first adhesive layer (22). The first contact portion (17) is exposed from the second adhesive layer (23). The portion of the first adhesive layer (22) that protrudes from the second adhesive layer (23) is the first protrusion (21).

6. The battery string according to claim 5, characterized in that, The maximum thickness of the first protrusion (21) is greater than the maximum thickness of the portion of the first adhesive layer (22) located on both sides of the first protrusion (21).

7. The battery string according to claim 1, characterized in that, In the end connection area (13), the height of the first gate line (11) is h1, the height of the second gate line (12) is h2, and the maximum thickness of the first protrusion (21) is h3. h1, h2, and h3 satisfy the following relationship: 0.3h2≤h3≤h1=h2.

8. The battery string according to any one of claims 1-7, characterized in that, Among the multiple connection areas, the connection area that is farther from the edge of the battery (10) in the first direction than the end connection area (13) is the middle connection area (15). One of the first grid line (11) and the second grid line (12) is provided with a second contact portion at the position corresponding to the middle connection area (15), and the other is provided with a second break (16) at the position corresponding to the middle connection area (15). The battery string also includes: A second adhesive is bonded to the central connection area (15), and the second contact portion is exposed from the second adhesive. The second electrical connector is bonded to the central connection area (15) by the second adhesive. The second electrical connector is electrically connected to the second contact portion in a contact manner. The other of the first grid line (11) and the second grid line (12) is insulated from the second electrical connector by the second break (16).

9. The battery string according to claim 8, characterized in that, The plurality of central connection areas (15) include a first central connection area and a second central connection area arranged at intervals and staggered. In the first central connection area, the first grid line (11) is provided with a second contact portion and the second grid line (12) is provided with a second break (16). In the second central connection area, the second grid line (12) is provided with a second contact portion and the first grid line (11) is provided with a second break (16).

10. A photovoltaic module, characterized in that, include: The battery string according to any one of claims 1-9.

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