Battery string and photovoltaic module

Abstract

The utility model discloses a battery string and photovoltaic module, the battery string includes: battery and electric connecting piece, the surface of battery is provided with a plurality of first grid line, the plurality of first grid line all extend in the first direction and are arranged at interval in the second direction, the battery is provided with the connecting area that extends in the second direction, the electric connecting piece is arranged in the connecting area, the electric connecting piece comprises an electric connecting part and a protruding part, the protruding part is connected with the electric connecting part, the protruding part is arranged in a protruding mode in the direction away from the surface of the battery and is separated from the surface of the battery, and the electric connecting part is connected with the surface of the battery. The electric connection parts are electrically connected with the first grid lines located below the electric connection parts and the first grid lines located below the protruding parts adjacent to the electric connection parts. Through the arrangement, a connecting material between the protruding part and the surface of the battery can be saved, and the light reflection efficiency of the protruding part can be improved, so that the cost can be saved, the warping degree of the battery can be reduced, the current collecting efficiency of the photovoltaic module can be improved, and the service life of the photovoltaic module can be prolonged.

Description

Technical Field

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

[0002] At present, the solder tape in the battery string generates heat by itself after being electrified, so that the solder on the surface of the solder tape melts, and then the solder tape can be connected to the battery. In the related art, for the welding method between the batteries in the battery string, it is first necessary to print insulating glue and solder paste, and then weld the solder tape. The solder tape is flat and rectangular. In order to ensure that the battery can collect current, an insulating glue needs to be provided between the solder tape and the battery for connection, which will increase the cost. Moreover, the flat solder tape will reduce the light reflectivity, thus affecting the power of the battery and further affecting the current collection efficiency of the photovoltaic module. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a battery string which can not only save costs, but also reduce the warpage of the battery, thereby ensuring the current collection efficiency of the photovoltaic module.

[0004] The utility model further provides a photovoltaic module.

[0005] The battery string according to the utility model includes: a battery and an electrical connector. A plurality of first grid lines are arranged on the surface of the battery. The plurality of first grid lines all extend in a first direction and are spaced apart in a second direction. The first direction and the second direction are perpendicular. The battery is provided with a connection area extending in the second direction. The electrical connector is arranged in the connection area. The electrical connector includes: an electrical connection part and a protruding part. The protruding part is connected to the electrical connection part. The protruding part protrudes in a direction away from the surface of the battery and is spaced apart from the surface of the battery. The electrical connection part is connected to the surface of the battery. The electrical connection part is electrically connected to the first grid line located below it and the first grid line below the adjacent protruding part respectively.

[0006] According to the battery string of the utility model, by arranging a plurality of first grid lines and a connection area on the surface of the battery, and electrically connecting the electrical connection part to the first grid line below it and the first grid line below the adjacent protruding part, the electrical connection steps of the battery can be optimized. Moreover, the protruding part protrudes away from the surface of the battery relative to the electrical connection part, and the protruding part and the electrical connection part are connected in an alternating and spaced manner. Such a setting can save the connection material between the protruding part and the surface of the battery, and increase the light reflection efficiency of the protruding part, thereby saving costs, reducing the warpage of the battery, improving the current collection efficiency of the photovoltaic module, and prolonging the service life of the photovoltaic module.

[0007] In some examples of the present utility model, the protruding portion is arched.

[0008] In some examples of the present utility model, there are multiple of the electrical connection portions and the protruding portions, and the multiple electrical connection portions and the multiple protruding portions are staggeredly connected in the second direction; or there are multiple of the electrical connection portions and the protruding portions, and at least two of the protruding portions that are sequentially connected in the second direction are connected between two adjacent electrical connection portions.

[0009] In some examples of the present utility model, the surface of the electrical connector away from the battery is an arc surface, and the arc surface is a convex arc surface protruding towards the surface away from the battery or a concave arc surface recessed towards the surface close to the battery.

[0010] In some examples of the present utility model, the maximum distance from the arc surface to its corresponding chord is L1, and L1 satisfies the relationship: 0 < L1 ≤ 0.6 mm; and / or the central angle corresponding to the arc surface is α, and α satisfies the relationship 0 < α ≤ 180°.

[0011] In some examples of the present utility model, the thickness of the electrical connection portion is d1, and the thickness of the protruding portion is d2, and d1 and d2 satisfy the relationship: 0.01 mm ≤ d1 - d2 ≤ 0.6 mm.

[0012] In some examples of the present utility model, a connection line is provided on the surface of the battery, the connection line extends in the second direction, and the connection line is respectively connected to the first grid line below the electrical connection portion and the first grid line below the protruding portion adjacent to the electrical connection portion.

[0013] In some examples of the present utility model, a plurality of second grid lines are provided on the surface of the battery, the plurality of second grid lines all extend in the first direction and are arranged at intervals and staggeredly in the second direction with the plurality of first grid lines, and a break is provided at the position of each of the plurality of second grid lines corresponding to the connection area, and both ends of the connection line are respectively connected to the first grid lines below two adjacent electrical connection portions.

[0014] In some examples of the present utility model, a plurality of second grid lines are provided on the surface of the battery, the plurality of second grid lines all extend in the first direction and are arranged at intervals and staggeredly in the second direction with the plurality of first grid lines, a break is provided at the position of a part of the plurality of second grid lines corresponding to the connection area and another part penetrates the connection area, the other part of the plurality of second grid lines is located below the protruding portion, and the connection lines below each protruding portion are respectively located on both sides of the other part of the second grid line to connect the protruding portion on the corresponding side and the first grid line below the electrical connection portion.

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

[0016] Compared with the prior art, the present utility model adopts the method of arranging a plurality of first grid lines and a connection area on the battery surface, and the electrical connection part is electrically connected to the first grid lines below and adjacent to the lower part of the protruding part, so as to optimize the electrical connection steps of the battery. Moreover, the protruding part protrudes away from the battery surface relative to the electrical connection part, and the protruding part and the electrical connection part are connected in an alternating and spaced manner. Such a setting can save the connection material between the protruding part and the battery surface, and can also increase the light reflection efficiency of the protruding part, thereby saving costs and reducing the warpage degree of the battery. Furthermore, it can improve the current collection efficiency of the photovoltaic module and extend the service life of the photovoltaic module.

[0017] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0018] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0019] Figure 1 is a partial structural schematic diagram of the battery string;

[0020] Figure 2 is a cross-sectional view of an electrical connector;

[0021] Figure 3 is another cross-sectional view of the electrical connector;

[0022] Figure 4 is a cross-sectional view of a protruding part;

[0023] Figure 5 is another cross-sectional view of the protruding part.

[0024] Reference Signs:

[0025] 10. Battery; 11. First grid line; 12. Connecting wire; 13. Second grid line; 14. Break; 20. Electrical connector; 21. Electrical connection part; 22. Protruding part. Detailed Embodiments

[0026] The embodiments of the present utility model will be described in detail below. The embodiments described with reference to the drawings are exemplary. The embodiments of the present utility model will be described in detail below.

[0027] The following refers to Figures 1-5 Describe the battery string according to the embodiments of the present utility model, which is applied to a photovoltaic module.

[0028] AsFigures 1-3 As shown in Figures 1-3 , the battery string according to the present utility model includes: a battery 10 and an electrical connector 20. A plurality of first grid lines 11 are provided on the surface of the battery 10. The plurality of first grid lines 11 all extend in a first direction and are spaced apart in a second direction. The first direction and the second direction are perpendicular. The battery 10 is provided with a connection area extending in the second direction. The electrical connector 20 is disposed in the connection area. The electrical connector 20 includes: an electrical connection portion 21 and a protruding portion 22. The protruding portion 22 is connected to the electrical connection portion 21. The protruding portion 22 protrudes in a direction away from the surface of the battery 10 and is spaced apart from the surface of the battery 10. The electrical connection portion 21 is connected to the surface of the battery 10. The electrical connection portion 21 is electrically connected to the first grid line 11 located below it and the first grid line 11 below the adjacent protruding portion 22 respectively.

[0029] It can be understood that the battery 10 and the electrical connector 20 constitute the main mechanism of the battery string. A plurality of first grid lines 11 are provided on the surface of the battery 10. The plurality of first grid lines 11 extend in the first direction, so as to ensure uniform distribution of current in the entire battery string. Such a setting can make the current transfer power between battery strings larger, and can also reduce current concentration, thereby improving the stability of the battery string. Moreover, the plurality of first grid lines 11 can share the current load, thereby reducing the resistance of a single welding point or connection, as well as reducing the overall resistance and energy loss.

[0030] In addition, a plurality of connection areas are provided on the surface of the battery 10. The plurality of connection areas extend in the second direction, and the plurality of connection areas are spaced apart in the first direction. The electrical connector 20 is located on the connection area. Such a setting can limit the electrical connector 20 by the connection area, thereby facilitating the formation of an electrical connection between the electrical connector 20 and the battery 10, and further ensuring the power generation efficiency of the battery string. For example, the electrical connector 20 is a welding tape, which facilitates the electrical connection between the welding tape and the battery 10.

[0031] Furthermore, the electrical connection portion 21 and the protruding portion 22 constitute the main structure of the electrical connector 20. The protruding portion 22 is connected to the electrical connection portion 21, so as to ensure the coherence and consistency of the electrical connector 20. The protruding portion 22 protrudes in a direction away from the surface of the battery 10 relative to the electrical connection portion 21, so that the protruding portion 22 forms an arch relative to the electrical connection portion 21. Moreover, the electrical connection portion 21 and the protruding portion 22 are staggered and spaced apart in the second direction, so that the electrical connection portion 21 and the protruding portion 22 form a shape of rising and falling. An adhesive is provided between the electrical connection portion 21 and the surface of the battery 10, so that the electrical connection portion 21 and the battery 10 can be connected. No adhesive is provided between the protruding portion 22 and the surface of the battery 10, which can save the adhesive below the protruding portion 22, thereby saving costs and reducing the warpage degree of the battery 10, and further extending the service life of the photovoltaic module.

[0032] Among them, the electrical connection part 21 is connected to the first grid line 11 below it and also to the first grid line 11 below the protruding part 22. Such a setting can ensure the electrical connection between the electrical connector 20 and the battery 10, thereby ensuring the efficiency of the battery 10 in collecting current. Moreover, the protruding part 22 can increase the light reflection efficiency. Such a setting can improve the bifaciality of the electrical connector 20, thereby improving the efficiency of the photovoltaic module in collecting current.

[0033] Thus, by arranging a plurality of first grid lines 11 and connection areas on the surface of the battery 10, and the electrical connection part 21 is electrically connected to the first grid lines 11 below and adjacent to the protruding part 22 below, the electrical connection steps of the battery 10 can be optimized. Moreover, the protruding part 22 protrudes away from the surface of the battery 10 relative to the electrical connection part 21, and the protruding part 22 and the electrical connection part 21 are connected in an alternating and spaced manner. Such a setting can save the connection material between the protruding part 22 and the surface of the battery 10, and can also increase the light reflection efficiency of the protruding part 22, thereby saving costs and reducing the warpage of the battery 10, and further improving the efficiency of the photovoltaic module in collecting current and extending the service life of the photovoltaic module.

[0034] In particular, as Figures 2-5 shown, the protruding part 22 is arched. Such a setting can make the protruding part 22 protrude away from the surface of the battery 10 relative to the electrical connection part 21. An adhesive is provided on the surfaces of the electrical connection part 21 and the battery 10, so that the electrical connection part 21 and the battery 10 can be connected. No adhesive is provided between the protruding part 22 and the surface of the battery 10. This can save the adhesive below the protruding part 22, thereby saving costs and reducing the warpage of the battery 10, and further extending the service life of the photovoltaic module.

[0035] Optionally, there are a plurality of electrical connection parts 21 and a plurality of protruding parts 22, and the plurality of electrical connection parts 21 and the plurality of protruding parts 22 are connected alternately in the second direction; or there are a plurality of electrical connection parts 21 and a plurality of protruding parts 22, and at least two protruding parts 22 connected in sequence in the second direction are connected between two adjacent electrical connection parts 21.

[0036] It can be understood that multiple electrical connection parts 21 and multiple protruding parts 22 are connected in sequence, so that the electrical connector 20 can extend along the second direction, which is convenient for the electrical connector 20 to be electrically connected to the first grid line 11. Moreover, there are two connection methods for the electrical connection part 21 and the protruding part 22. The first is that one electrical connection part 21 is connected to one protruding part 22, and the electrical connection part 21 and the protruding part 22 are arranged alternately. The second is that at least two protruding parts 22 are arranged between two adjacent electrical connection parts 21, and the at least two protruding parts 22 are close to each other for connection. Such an arrangement can make the electrical connection part 21 and the protruding part 22 be connected alternately at intervals, save the connection material between the protruding part 22 and the surface of the battery 10, increase the light reflection efficiency of the protruding part 22, thus saving costs and reducing the warpage of the battery 10, further improving the efficiency of the photovoltaic module in collecting current and extending the service life of the photovoltaic module.

[0037] Among them, as Figure 2 and Figure 3 shown, the surface of the electrical connector 20 away from the battery 10 is an arc surface, which is a convex arc surface protruding in the direction away from the surface of the battery 10 or a concave arc surface recessed in the direction close to the surface of the battery 10.

[0038] That is to say, in the connection method of one electrical connection part 21 and one protruding part 22, the surface of the protruding part 22 away from the surface of the battery 10 is an arc surface, which can save the adhesive under the protruding part 22, thus saving costs and reducing the warpage of the battery 10, and further extending the service life of the photovoltaic module. At least two protruding parts 22 are arranged between two adjacent electrical connection parts 21, and a concave arc surface is formed at the connection position of the at least two protruding parts 22. Such an arrangement can reduce the material consumption of the electrical connector 20 and also reduce the consumption of other components connected to the electrical connector 20, thus saving costs.

[0039] Optionally, as Figure 2 、 Figure 4 and Figure 5 shown, the maximum distance from the arc surface to its corresponding chord is L1, and L1 satisfies the relationship: 0 < L1 ≤ 0.6 mm; the central angle corresponding to the arc surface is α, and α satisfies the relationship 0 < α ≤ 180°.

[0040] It is understandable that the maximum distance from the arc surface to its corresponding chord should be within a reasonable range. If the maximum distance from the arc surface to its corresponding chord is greater than 0.6 mm, this will cause the protrusion 22 to be too high relative to the electrical connection portion 21, resulting in material waste of the electrical connection 20, and will also affect the conductive function of the electrical connection 20, thereby affecting the efficiency of the photovoltaic module in collecting current. If the maximum distance from the arc surface to its corresponding chord is within a reasonable range, such a setting can save the connection material between the protrusion 22 and the surface of the battery 10, and can also increase the light reflection efficiency of the protrusion 22, thereby saving costs, and reducing the warping of the battery 10, thereby improving the efficiency of the photovoltaic module in collecting current and extending the service life of the photovoltaic module. For example, in order to ensure the efficiency of the photovoltaic module in collecting current, L1 is 0.1 mm, 0.3 mm, or 0.5 mm. Consider selecting a suitable parameter in the specific design.

[0041] The center angle of the arc surface should be within a reasonable range. If the center angle of the arc surface is greater than 180°, the protrusion 22 will be too high relative to the electrical connection part 21, which will cause the power of the electrical connection part 20 to be electrically connected to the first grid line 11, and will also affect the assembly efficiency of the battery 10. If the center angle of the arc surface is within a reasonable range, such a setting can save the connection material between the protrusion 22 and the surface of the battery 10, and can also increase the light reflection efficiency of the protrusion 22, thereby saving costs, and reducing the warping of the battery 10, thereby improving the efficiency of the photovoltaic module in collecting current and extending the service life of the photovoltaic module. For example, in order to ensure the efficiency of the photovoltaic module in collecting current, α is 120°, 140°, or 160°. Consider selecting a suitable parameter in the specific design.

[0042] Optionally, the thickness of the electrical connection portion 21 is d1, the thickness of the protruding portion 22 is d2, and d1 and d2 satisfy the relationship: 0.01 mm≤d1-d2≤0.6 mm.

[0043] That is to say, the difference between the thickness of the electrical connection part 21 and the thickness of the protrusion 22 should be within a reasonable range. If the difference between the thickness of the electrical connection part 21 and the thickness of the protrusion 22 is greater than 0.6 mm, the protrusion 22 will be too high relative to the electrical connection part 21, resulting in material waste of the electrical connection part 20, and will also affect the conductive function of the electrical connection part 20, thereby affecting the efficiency of the photovoltaic module in collecting current. If the difference between the thickness of the electrical connection part 21 and the thickness of the protrusion 22 is within a reasonable range, such a setting can save the connection material between the protrusion 22 and the surface of the battery 10, and can also increase the light reflection efficiency of the protrusion 22, thereby saving costs, and reducing the warpage of the battery 10, thereby improving the efficiency of the photovoltaic module in collecting current and extending the service life of the photovoltaic module. For example, the width of the electrical connection part 21 is 0.1 mm-5 mm, and the thickness is 0.01 mm-0.6 mm. In order to ensure the efficiency of the photovoltaic module in collecting current, d1-d2 is 0.1 mm, 0.3 mm, or 0.5 mm. Consider choosing an appropriate parameter during specific design.

[0044] In addition, if Figure 1 As shown, a connection line 12 is provided on the surface of the battery 10 , and the connection line 12 extends along the second direction, and the connection line 12 is respectively connected to the first grid line 11 located below the electrical connection part 21 and the first grid line 11 below the protrusion 22 adjacent to the electrical connection part 21 .

[0045] It can be understood that the connecting line 12 is located on the surface of the battery 10, and the connecting line 12 extends along the second direction. This arrangement can make the connecting line 12 perpendicular to the first grid line 11, and can also make the connecting line 12 electrically connected to the first grid line 11. The electrical connecting portion 21 is connected to the first grid line 11 thereunder, and is also connected to the first grid line 11 below the protrusion 22. This arrangement can ensure that the electrical connector 20 is electrically connected to the battery 10, thereby ensuring the efficiency of the battery 10 in collecting current, and the protrusion 22 can increase the reflection efficiency of light. This arrangement can improve the double-sidedness of the electrical connector 20, thereby improving the efficiency of the photovoltaic module in collecting current.

[0046] In addition, Figure 1 As shown, a plurality of second gate lines 13 are arranged on the surface of the battery 10, and the plurality of second gate lines 13 all extend in the first direction and are arranged alternately with the plurality of first gate lines 11 in the second direction at intervals, and the plurality of second gate lines 13 are all provided with break points 14 at the positions of the corresponding connection areas, and the two ends of the connection line 12 are respectively connected to the first gate lines 11 under the two adjacent electrical connection parts 21.

[0047] That is to say, a plurality of second grid lines 13 with polarities opposite to those of the first grid lines 11 are arranged on the surface of the battery 10. The plurality of second grid lines 13 all extend in the first direction and are arranged at intervals and staggered in the second direction. Breaks 14 are arranged at the positions of the plurality of second grid lines 13 corresponding to their connection areas, so that the second grid lines 13 can be segmented along the first direction, which not only facilitates the second grid lines 13 to collect current, but also enables the adhesive to be filled in the breaks 14, thus facilitating the adhesive to bond the electrical connection parts 21, and further facilitating the electrical connector 20 to connect to the battery 10. Moreover, both ends of the connection line 12 are respectively connected to the first grid lines 11 below two adjacent electrical connection parts 21. Such an arrangement can optimize the connection mode between the electrical connector 20 and the battery 10, and further optimize the connection steps of the battery string.

[0048] In addition, as Figure 1 shown, a plurality of second grid lines 13 are arranged on the surface of the battery 10. The plurality of second grid lines 13 all extend in the first direction and are arranged at intervals and staggered with the plurality of first grid lines 11 in the second direction. Breaks 14 are arranged at the positions of a part of the plurality of second grid lines 13 corresponding to their connection areas, and the other part penetrates through the connection areas. The other part of the plurality of second grid lines 13 is located below the protruding parts 22. The connection lines 12 below each protruding part 22 are respectively located on both sides of the other part of the second grid line 13 to connect the protruding part 22 on the corresponding side and the first grid line 11 below the electrical connection part 21.

[0049] It can be understood that a plurality of second grid lines 13 with polarities opposite to those of the first grid lines 11 are arranged on the surface of the battery 10. The plurality of second grid lines 13 all extend in the first direction and are arranged at intervals and staggered in the second direction. Breaks 14 are arranged at the positions of the plurality of second grid lines 13 corresponding to their connection areas, so that the second grid lines 13 can be segmented along the first direction, which not only facilitates the second grid lines 13 to collect current, but also enables the adhesive to be filled in the breaks 14, thus facilitating the adhesive to bond the electrical connection parts 21, and further facilitating the electrical connector 20 to connect to the battery 10. Moreover, a part of the second grid line 13 penetrates through the connection area, and the other part of the second grid line 13 can also be insulated from the electrical connector 20 through the break 14. The connection lines 12 below each protruding part 22 are connected to the first grid lines 11. Such an arrangement can ensure the current collection ability of the battery 10, thus optimizing the connection mode between the electrical connector 20 and the battery 10, further optimizing the connection steps of the battery string, and saving labor costs and material costs.

[0050] The photovoltaic module according to the present utility model includes: the battery string of the above embodiment. By providing a plurality of first grid lines 11 on the surface of the battery 10 and a connection area, the electrical connection part 21 is electrically connected to the first grid lines 11 below and below the adjacent protruding parts 22, so that the electrical connection steps of the battery 10 can be optimized. Moreover, the protruding part 22 protrudes from the surface of the battery 10 relative to the electrical connection part 21, and the protruding part 22 and the electrical connection part 21 are connected in an alternating and spaced manner. Such a setting can save the connection material between the protruding part 22 and the surface of the battery 10, and can also increase the light reflection efficiency of the protruding part 22, thereby saving costs and reducing the warpage of the battery 10. Furthermore, the efficiency of the photovoltaic module for collecting current can be improved, and the service life of the photovoltaic module can be extended.

[0051] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by 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. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 construed as a limitation of the present utility model.

[0052] In the description of the present utility model, the "first feature" and "second feature" may include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more. In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. In the description of the present utility model, the first feature being "above", "above" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0053] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions 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 of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. 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 (10), wherein a plurality of first grid lines (11) are arranged on the surface of the battery (10), the plurality of first grid lines (11) all extend in a first direction and are arranged at intervals in a second direction, the first direction is perpendicular to the second direction, and the battery (10) is provided with a connection area extending in the second direction; An electrical connector (20), the electrical connector (20) being arranged in the connection area, the electrical connector (20) comprising: an electrical connector portion (21) and a protruding portion (22), the protruding portion (22) being connected to the electrical connector portion (21), the protruding portion (22) being arranged to protrude in a direction away from the surface of the battery (10) and being spaced apart from the surface of the battery (10), the electrical connector portion (21) being connected to the surface of the battery (10), the electrical connector portion (21) being electrically connected to the first grid line (11) located therebelow and the first grid line (11) located therebelow and adjacent to the protruding portion (22), respectively.

2. The battery string according to claim 1, wherein The protruding portion (22) is arched.

3. The battery string according to claim 1, wherein, There are a plurality of the electrical connection parts (21) and the protruding parts (22), and the plurality of the electrical connection parts (21) and the plurality of the protruding parts (22) are staggered and connected in the second direction; or There are a plurality of the electrical connection parts (21) and the protruding parts (22), and at least two protruding parts (22) connected in sequence in the second direction are connected between two adjacent electrical connection parts (21).

4. The battery string according to claim 1, wherein, The surface of the electrical connector (20) on one side away from the battery (10) is a curved surface, which is a convex curved surface that bulges in a direction away from the surface of the battery (10) or a concave curved surface that is concave in a direction close to the surface of the battery (10).

5. The battery string according to claim 4, wherein, The maximum distance from the arc surface to its corresponding chord is L1, and L1 satisfies the relationship: 0<L1≤0.6mm; and / or The central angle of the arc surface is α, and α satisfies the relationship 0<α≤180°.

6. The battery string according to claim 1, characterized in that, The thickness of the electrical connection portion (21) is d1, the thickness of the protruding portion (22) is d2, and d1 and d2 satisfy the relationship: 0.01 mm ≤ d1 - d2 ≤ 0.6 mm.

7. The battery string according to claim 1, characterized in that, A connecting line (12) is provided on the surface of the battery (10), the connecting line (12) extending along the second direction, the connecting line (12) respectively connected to the first gate line (11) located below the electrical connection portion (21) and the first gate line (11) located below the protruding portion (22) adjacent to the electrical connection portion (21).

8. The battery string according to claim 7, wherein, A plurality of second grid lines (13) are arranged on the surface of the battery (10), the plurality of second grid lines (13) all extend in a first direction and are arranged alternately with the plurality of first grid lines (11) in the second direction, the plurality of second grid lines (13) are all provided with breaks (14) at positions corresponding to the connection areas, and the two ends of the connection line (12) are respectively connected to the first grid lines (11) below two adjacent electrical connection portions (21).

9. The battery string according to claim 7, wherein A plurality of second grid lines (13) are disposed on the surface of the battery (10). The plurality of second grid lines (13) all extend in a first direction and are spaced and staggered with the plurality of first grid lines (11) in a second direction. A part of the plurality of second grid lines (13) is provided with a break (14) at a position corresponding to the connection area, and another part penetrates through the connection area. The other part of the plurality of second grid lines (13) is located below the protruding portion (22). The connection lines (12) below each protruding portion (22) are respectively located on both sides of the other part of the second grid line (13) to connect the protruding portion (22) on the corresponding side and the first grid line (11) below the electrical connection portion (21).

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

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