Battery piece, battery string and photovoltaic module

Abstract

The utility model discloses a battery piece, a battery string and a photovoltaic assembly, the battery piece comprises a battery piece body and a first metal wire, the first metal wire comprises a main wire body and a connecting wire body, the main wire body is arranged on the surface of the battery piece body, the connecting wire body is connected to one end of the main wire body and protrudes out of the edge of the battery piece body, and the main wire body is arranged on the surface of the battery piece body. And the connecting wire body is used for being connected with the first metal wire of the adjacent battery piece. The main wire body is arranged on the surface of the battery piece body, the connecting wire body is arranged at one end of the main wire body, and the connecting wire body protrudes out of the edge of the battery piece body, so that two adjacent battery pieces can be connected through the connecting wire body, the arrangement of welding strips can be saved, and the purposes of reducing cost and increasing efficiency can be achieved.

Description

Technical Field

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

[0002] Currently, if the cells in photovoltaic modules are printed with main grids, it can cause the photovoltaic modules to melt during the string soldering process, which is not conducive to the manufacturing of photovoltaic modules. If the main grids are not printed, pads or gradient lines need to be printed below the solder ribbons, which will increase the cost of silver paste, making it difficult to achieve the goal of cost reduction and efficiency improvement. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a battery cell that connects adjacent cells via a first metal wire, thereby saving on the arrangement of solder strips and achieving cost reduction and efficiency improvement.

[0004] This utility model further proposes a battery string.

[0005] This utility model further proposes a photovoltaic module.

[0006] A battery cell according to a first aspect of the present invention includes: a battery cell body and a first metal wire. The first metal wire includes: a main wire body and a connecting wire body. The main wire body is disposed on the surface of the battery cell body. The connecting wire body is connected to one end of the main wire body and protrudes from the edge of the battery cell body. The connecting wire body is used to connect with the first metal wire of an adjacent battery cell.

[0007] Therefore, by setting the main wire on the surface of the cell body and setting a connecting wire at one end of the main wire, with the connecting wire protruding from the edge of the cell body, two adjacent cells can be connected through the connecting wire, thereby saving the arrangement of solder ribbons and achieving the goal of cost reduction and efficiency improvement.

[0008] According to some embodiments of this utility model, the length of the connecting line is L, and L satisfies the relationship: 1mm≤L≤10mm.

[0009] According to some embodiments of the present invention, there are multiple first metal wires, and the multiple first metal wires are respectively disposed on two surfaces of the battery cell body, and the connecting wires of the first metal wires on the two surfaces protrude from the battery cell body in opposite directions.

[0010] According to some embodiments of the present invention, the battery cell further includes: a second metal wire, the second metal wire being disposed on the surface of the battery cell body, and the main wire and the second metal wire being disposed perpendicular to and intersecting each other on the surface of the battery cell body.

[0011] According to some embodiments of the present invention, there are multiple first metal wires and multiple second metal wires, and the main bodies of the multiple first metal wires and the multiple second metal wires are intersected on the surface of the battery cell body and are generally arranged in a grid shape.

[0012] According to some embodiments of this utility model, the width of the first metal wire is d1, where d1 satisfies the relationship: 0.03mm ≤ d1 ≤ 0.5mm; and / or the cross-sectional area of ​​the first metal wire is S, where S satisfies the relationship: 0.003mm² 2 ≤S≤0.8mm 2 ; and / or the width of the second metal wire is d2, where d2 satisfies the relationship: 0.013mm≤d2≤0.05mm; and / or the height of the second metal wire is h, where h satisfies the relationship: 0.005mm≤h≤0.020mm.

[0013] According to some embodiments of the present invention, the cross-section of the first metal wire is one of a circle, a semi-circle, and a polygon; and / or the cross-section of the second metal wire is one of a circle, a semi-circle, and a polygon; and / or the first metal wire is one of a copper wire, an iron wire, a zinc wire, and a nickel wire; and / or the second metal wire is one of a copper wire, an iron wire, a zinc wire, and a nickel wire; and / or the first metal wire and the second metal wire are integrally formed.

[0014] According to a second aspect of the present invention, a battery string includes: a plurality of battery cells as described above, the plurality of battery cells being spaced apart, and between two battery cells, the connecting wire of one battery cell being connected to the first metal wire of the other battery cell.

[0015] According to some embodiments of the present invention, between two battery cells, the connecting wire is inclined relative to the thickness direction of the battery cell body to connect with the first metal wire of the adjacent battery cell; and / or the connecting wire located at the outermost end of the battery cell is collinear with the main wire and is used as the electrode of the battery string.

[0016] A photovoltaic module according to a third aspect of the present invention includes: the battery string described above.

[0017] Compared with the prior art, this utility model adopts a method of setting the main wire body on the surface of the battery cell body, and setting a connecting wire body at one end of the main wire body. The connecting wire body protrudes from the edge of the battery cell. In this way, two adjacent battery cells can be connected by the connecting wire body, thereby saving the arrangement of solder ribbon and achieving the purpose of cost reduction and efficiency improvement.

[0018] 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

[0019] 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:

[0020] Figure 1 This is a schematic diagram of the structure of the battery cell according to an embodiment of the present utility model;

[0021] Figure 2 This is a simplified schematic diagram of the first angle structure of a battery string according to an embodiment of the present utility model;

[0022] Figure 3 This is a simplified schematic diagram of the second angle structure of a battery string according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of another battery string structure according to an embodiment of the present utility model.

[0024] Figure label:

[0025] 100. Battery cells;

[0026] 10. Battery cell body; 20. First metal wire; 21. Main wire body; 22. Connecting wire body; 30. Second metal wire;

[0027] 200. Battery string. Detailed Implementation

[0028] 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.

[0029] The following is for reference. Figures 1-4 A solar cell 100 according to an embodiment of the present invention is described, which is used in a photovoltaic module.

[0030] like Figures 1-4As shown, the battery cell 100 according to the first aspect embodiment of the present invention includes: a battery cell body 10 and a first metal wire 20. The first metal wire 20 includes: a main wire body 21 and a connecting wire body 22. The main wire body 21 is disposed on the surface of the battery cell body 10. The connecting wire body 22 is connected to one end of the main wire body 21 and protrudes from the edge of the battery cell body 10. The connecting wire body 22 is used to connect with the first metal wire 20 of the adjacent battery cell 100.

[0031] It is understood that the cell body 10 and the first metal wire 20 constitute the main structure of the cell 100. The first metal wire 20 is disposed on the cell body 10, which provides installation space for the first metal wire 20 and allows the first metal wire 20 to connect two adjacent cells 100, thereby connecting the cells 100 into a battery string 200. The main wire 21 and the connecting wire 22 constitute the main structure of the first metal wire 20. The main wire 21 is located on the surface of the cell body 10, which allows the main wire 21 to transmit electricity from the surface of the cell 100. The connecting wire 22 is located at one end of the main wire 21 and extends beyond the edge of the cell 100. This allows the current in the cell body 10 to be transmitted to the connecting wire 22 through the main wire 21. The connecting wire 22 is then connected to the first metal wire 20 in the adjacent cell 100, thereby enabling current to be transmitted between adjacent cells 100. This not only allows the first metal wire 20 to function as a solder ribbon, but also avoids contact resistance between the solder ribbon and the first metal wire 20, thereby improving the current transmission rate between adjacent cells 100 and reducing costs.

[0032] For example, the cross-section of the first metal wire 20 can be one of a circle, a semi-circle, or a polygon, and the first metal wire 20 can be one of a copper wire, an iron wire, a zinc wire, or a nickel wire. This arrangement can ensure the rate at which the first metal wire 20 transmits the current in the battery cell 100, reduce the production cost of the first metal wire 20, and ensure the uniformity and consistency of the texture of the first metal wire 20, thereby facilitating the transmission of current by the first metal wire 20 and achieving the goal of cost reduction and efficiency improvement. For example, if the first metal wire 20 is made of copper, its resistivity can be maintained at around 1.7*10-8 Ω·m, thereby facilitating the transmission of current between two adjacent battery cells 100.

[0033] Therefore, by setting the main wire 21 on the surface of the cell body 10, and setting a connecting wire 22 at one end of the main wire 21, with the connecting wire 22 protruding from the edge of the cell body 10, two adjacent cells 100 can be connected through the connecting wire 22, thereby saving the arrangement of solder strips and achieving the purpose of cost reduction and efficiency improvement.

[0034] Optionally, such as Figure 1As shown, the length of the connecting line 22 is L, and L satisfies the relationship: 1mm≤L≤10mm. In other words, the length of the connecting wire 22 must be within a reasonable range. If the length of the connecting wire 22 is less than 1mm, after the connecting wire 22 connects to the first metal wire 20 in the adjacent cells 100, the distance between the two adjacent cells 100 will be too close. This is not conducive to the arrangement of the cells 100, and will also affect the generation of hot spot effect in the cells 100 and the heat dissipation of the cells 100. This is not conducive to the arrangement of the battery string 200 and the transmission of current. If the length of the connecting wire 22 is greater than 10mm, this will result in the connecting wire 22 being too long and the distance between the cells 100 being too large. This will reduce the space utilization rate of the battery string 200 and increase the cost of the cells 100. It will also lose most of the light energy, thus failing to achieve the goal of cost reduction and efficiency improvement. If the length of the connecting wire 22 is within a reasonable range, it can not only prevent the generation of hot spot effect between the cells 100 and facilitate the heat dissipation of the cells 100, but also improve the space utilization rate of the battery string 200 and ensure the utilization rate of light energy. This can reduce the cost of photovoltaic modules and improve the efficiency of photovoltaic modules.

[0035] In addition, such as Figures 1-4 As shown, there are multiple first metal wires 20, which are respectively disposed on two surfaces of the battery cell body 10. The connecting wires 22 of the first metal wires 20 on the two surfaces protrude from the battery cell body 10 in opposite directions.

[0036] Understandably, a portion of the multiple first metal wires 20 are disposed on one side surface of the cell body 10, and another portion of the multiple first metal wires 20 are disposed on the other side surface of the cell body 10. That is, a portion of the multiple first metal wires 20 are located on the front side of the cell body 10, and another portion is located on the back side of the cell body 10. The connecting wire 22 of the first metal wire 20 located on the front side of the cell body 10 is connected to the first metal wire 20 on the back side of the adjacent cell body 10, and the connecting wire 22 of the first metal wire 20 located on the back side of the cell body 10 is connected to the first metal wire 20 on the front side of the adjacent cell body 10. In this way, the connecting wire 22 on the front side of one cell body 10 can be connected to the first metal wire 20 of another adjacent cell body 10, and so on, to form a battery string 200. This not only allows the first metal wires 20 to function as solder ribbons, but also avoids contact resistance between the solder ribbons and the first metal wires 20, thereby improving the current transfer rate between adjacent cells 100 and reducing costs.

[0037] For example, a portion of the multiple first metal wires 20 are located on the front side of the cell body 10, and another portion is located on the back side of the cell body 10. One end of the main wire 21 on the front side of the cell body 10 is provided with a connecting wire 22, which is inclined towards the back side. One end of the main wire 21 on the back side of the adjacent cell body 10 is provided with a connecting wire 22, which is inclined towards the front side. This allows the connecting wires 22 in two adjacent cells 100 to connect between them, and so on, to form a battery string 200. This not only allows the first metal wires 20 to function as solder ribbons, but also avoids contact resistance between the solder ribbons and the first metal wires 20, thereby improving the current transfer rate between adjacent cells 100 and reducing costs.

[0038] In addition, such as Figure 1 and Figure 2 As shown, the battery cell 100 also includes a second metal wire 30, which is disposed on the surface of the battery cell body 10. The main wire 21 and the second metal wire 30 are disposed perpendicular to each other and intersecting on the surface of the battery cell body 10.

[0039] In other words, the second metal wire 30 is also disposed on the cell body 10, which provides installation space for the second metal wire 30 on the cell body 10. The second metal wire 30 can collect the current on the cell body 10. Moreover, the main wire 21 and the second metal wire 30 are arranged perpendicularly and intersectingly on the surface of the cell body 10, so that after the second metal wire 30 collects the current of the cell body 10, the current is transmitted to the first metal wire 20 through the second metal wire 30. The first metal wire 20 then connects two adjacent cells 100, thereby improving the efficiency of the photovoltaic module in collecting current.

[0040] For example, the cross-section of the second metal wire 30 can be one of a circle, a semi-circle, or a polygon, and the second metal wire 30 can be one of a copper wire, an iron wire, a zinc wire, or a nickel wire. This arrangement can ensure the rate at which the second metal wire 30 collects the current from the battery cell 100, reduce the production cost of the second metal wire 30, and ensure the uniformity and consistency of the texture of the second metal wire 30. This facilitates the transfer of current from the second metal wire 30 to the first metal wire 20, and achieves the goal of cost reduction and efficiency improvement. For example, if the second metal wire 30 is made of copper, it is convenient that the first metal wire 20 and the second metal wire 30 are made of the same material, which facilitates the cross arrangement of the first metal wire 20 and the second metal wire 30, and also facilitates the second metal wire 30 collecting the current from the battery cell body 10. This facilitates the second metal wire 30 transferring the current to the first metal wire 20, and the first metal wire 20 then connects and transmits the current between two adjacent battery cells 100.

[0041] In particular, such as Figure 1 and Figure 2 As shown, there are multiple first metal wires 20 and multiple second metal wires 30. The main body 21 of the multiple first metal wires 20 and the multiple second metal wires 30 are intersected on the surface of the battery cell body 10 and are arranged in a grid pattern.

[0042] Understandably, multiple first metal wires 20 are evenly spaced on the surface of the cell body 10, and multiple second metal wires 30 are arranged perpendicularly to the multiple first metal wires 20. Moreover, the multiple second metal wires 30 are also evenly spaced on the surface of the cell body 10. This arrangement allows the multiple first metal wires 20 and the multiple second metal wires 30 to form a grid, thereby enabling the second metal wires 30 to evenly collect the current of the cell body 10 and the first metal wires 20 to evenly transmit the current. It also optimizes the layout of the first metal wires 20 and the second metal wires 30, thereby improving the efficiency of current collection and transmission, and without affecting the local heat dissipation of the surface of the cell 100.

[0043] For example, the length of the battery cell body 10 is 210mm and the width is 182mm. Multiple first metal wires 20 are parallel to the wide side of the battery cell body 10, and multiple second metal wires 30 are parallel to the long side of the battery cell body 10. There can be 10-30 first metal wires 20 and 40-200 second metal wires 30. This ensures that the second metal wires 30 collect the current of the battery cell body 10 evenly, and the first metal wires 20 transmit the current evenly, thereby improving the current collection and transmission efficiency and not affecting the local heat dissipation of the surface of the battery cell 100.

[0044] Moreover, the multiple first metal wires 20 and multiple second metal wires 30 can be integrally formed, which not only facilitates manufacturing but also makes the texture of the first metal wires 20 and the second metal wires 30 uniform and consistent, thereby ensuring the current throughput of the first metal wires 20 and the second metal wires 30.

[0045] Optionally, the width of the first metal wire 20 is d1, where d1 satisfies the relationship: 0.03mm ≤ d1 ≤ 0.5mm. That is, the width and cross-sectional area of ​​the first metal wire 20 and the second metal wire 30 must be within a reasonable range. If the width of the first metal wire 20 is less than 0.03mm, the current throughput when transferring current between two adjacent battery cells 100 will be low, thus failing to guarantee effective current transfer between the battery cells 100. If the width of the first metal wire 20 is greater than 0.5mm, it will result in material waste, thus failing to meet the cost reduction objective. If the width of the first metal wire 20 is within a reasonable range, not only can the current throughput in the first metal wire 20 be guaranteed, but the cost reduction objective can also be achieved.

[0046] Optionally, the cross-sectional area of ​​the first metal wire 20 is S, where S satisfies the relationship: 0.003 mm. 2 ≤S≤0.8mm 2 In other words, if the cross-sectional area of ​​the first metal wire 20 is less than 0.003 mm... 2 This will result in a low current throughput when the first metal wire 20 transmits current between two adjacent battery cells 100, thus failing to guarantee effective current transfer between the battery cells 100. If the cross-sectional area of ​​the first metal wire 20 is greater than 0.8 mm², this will further exacerbate the problem. 2 This would lead to a waste of material in the first metal wire 20, thus failing to achieve the goal of reducing costs. If the width of the first metal wire 20 is within a reasonable range, not only can the current throughput in the first metal wire 20 be guaranteed, but the goal of reducing costs can also be achieved.

[0047] Optionally, the width of the second metal wire 30 is d2, where d2 satisfies the relationship: 0.013mm ≤ d2 ≤ 0.05mm. That is, if the width of the second metal wire 30 is less than 0.013mm, its ability to collect power from the battery cell body 10 will be weak, making it impossible to transfer the collected current to the first metal wire 20 and adjacent battery cells 100, thus failing to guarantee effective current transfer between battery cells 100. If the width of the second metal wire 30 is greater than 0.05mm, it will result in material waste, failing to achieve the goal of cost reduction. If the width of the second metal wire 30 is within a reasonable range, it can not only guarantee the current collection rate in the first metal wire 20 but also achieve the goal of cost reduction.

[0048] Optionally, the height of the second metal wire 30 is h, where h satisfies the relationship: 0.005mm ≤ h ≤ 0.020mm. That is, if the height of the second metal wire 30 is less than 0.005mm, its ability to collect power from the battery cell body 10 will be weak, making it impossible to transfer the collected current to the first metal wire 20 and adjacent battery cells 100, thus failing to guarantee effective current transfer between battery cells 100. If the height of the second metal wire 30 is greater than 0.02mm, it will result in material waste, failing to achieve the goal of cost reduction. If the height of the second metal wire 30 is within a reasonable range, it can not only guarantee the current collection rate in the first metal wire 20 but also achieve the goal of cost reduction.

[0049] like Figures 2-4 As shown, the battery string 200 according to the second aspect embodiment of the present utility model includes: a plurality of battery cells 100 of the above embodiments, the plurality of battery cells 100 being arranged at intervals, and between two battery cells 100, a connecting wire 22 of one battery cell 100 is connected to a first metal wire 20 of another battery cell 100.

[0050] Understandably, multiple battery cells 100 are arranged at intervals, and the first metal wire 20 connects two adjacent battery cells 100, thereby connecting multiple battery cells 100 into a battery string 200. In two adjacent battery cells 100, the connecting wire 22 in one battery cell 100 is connected to the first metal wire 20 in the other battery cell 100. For example, it can be connected to the main wire 21 in the other battery cell 100, or it can be connected to the connecting wire 22 in the other battery cell 100. In this way, the two adjacent battery cells 100 can be connected through the connecting wire 22, thereby saving the arrangement of solder ribbons and achieving the purpose of cost reduction and efficiency improvement.

[0051] In addition, such as Figure 3 and Figure 4 As shown, between two battery cells 100, the connecting wire 22 is inclined relative to the thickness direction of the battery cell body 10 to connect with the first metal wire 20 of the adjacent battery cell 100; the outermost connecting wire 22 of the outermost battery cell 100 is colinearly arranged with the main wire 21 and is used as the electrode of the battery string 200.

[0052] In other words, in two adjacent solar cells 100, the connecting wire 22 in one of the first metal wires 20 is inclined relative to one side surface of the solar cell 100. This arrangement facilitates the connection of the connecting wire 22 to the other side surface of the adjacent solar cell body 10, thereby connecting adjacent solar cells 100 without wasting space. This improves the space utilization and current transfer efficiency of the photovoltaic module. Specifically, the connecting wire 22 on the front side of the first solar cell body 10 is connected to the first metal wire 20 of the second solar cell body 10, and so on, forming a series connection for the solar cell. The string 200 not only allows the first metal wire 20 to function as a solder ribbon, but also avoids contact resistance between the solder ribbon and the first metal wire 20, thereby improving the current transfer rate between adjacent cells 100 and reducing costs. Moreover, the outermost connecting wire 22 of the outermost cell 100 is collinear with the main wire 21 and is used as the electrode of the string 200. This allows the outermost connecting wire 22, the main wire 21 and the inner first metal wire 20 to form a current loop, thereby ensuring the current transfer rate in the photovoltaic module.

[0053] A photovoltaic module according to a third aspect embodiment of the present invention includes: a battery string 200 as described above. By providing a main wire 21 on the surface of the battery cell body 10, and providing a connecting wire 22 at one end of the main wire 21, with the connecting wire 22 protruding from the edge of the battery cell 100, two adjacent battery cells 100 can be connected by the connecting wire 22. Multiple battery cells 100 can be connected to form a battery string 200, thereby saving on the arrangement of solder strips and achieving the purpose of cost reduction and efficiency improvement.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell (100), characterized in that, include: Battery cell body (10); The first metal wire (20) includes a main wire body (21) and a connecting wire body (22). The main wire body (21) is disposed on the surface of the battery cell body (10). The connecting wire body (22) is connected to one end of the main wire body (21) and protrudes from the edge of the battery cell body (10). The connecting wire body (22) is used to connect with the first metal wire (20) of the adjacent battery cell (100).

2. The battery cell (100) according to claim 1, characterized in that, The length of the connecting line (22) is L, and L satisfies the relationship: 1mm≤L≤10mm.

3. The battery cell (100) according to claim 1, characterized in that, There are multiple first metal wires (20), and the multiple first metal wires (20) are respectively disposed on two surfaces of the battery cell body (10). The connecting wires (22) of the first metal wires (20) on the two surfaces protrude from the battery cell body (10) in opposite directions.

4. The battery cell (100) according to claim 1, characterized in that, Also includes: The second metal wire (30) is disposed on the surface of the battery cell body (10), and the main wire body (21) and the second metal wire (30) are disposed perpendicularly to each other and intersecting on the surface of the battery cell body (10).

5. The battery cell (100) according to claim 4, characterized in that, There are multiple first metal wires (20) and multiple second metal wires (30). The main wire bodies (21) of the multiple first metal wires (20) and the multiple second metal wires (30) are intersected on the surface of the battery cell body (10) and are generally arranged in a grid shape.

6. The battery cell (100) according to claim 4, characterized in that, The width of the first metal wire (20) is d1, which satisfies the relationship: 0.03mm ≤ d1 ≤ 0.5mm; and / or, The cross-sectional area of ​​the first metal wire (20) is S, and S satisfies the relationship: 0.003 mm 2 ≤S≤0.8mm 2 ; and / or, The width of the second metal wire (30) is d2, which satisfies the relationship: 0.013mm ≤ d2 ≤ 0.05mm; and / or, The height of the second metal wire (30) is h, and h satisfies the relationship: 0.005mm≤h≤0.020mm.

7. The battery cell (100) according to claim 4, characterized in that, The cross-section of the first metal wire (20) is one of a circle, a semicircle, and a polygon; and / or, The cross-section of the second metal wire (30) is one of a circle, a semicircle, and a polygon; and / or, The first metal wire (20) is one of copper wire, iron wire, zinc wire, and nickel wire; and / or, The second metal wire (30) is one of copper wire, iron wire, zinc wire, and nickel wire; and / or, The first metal wire (20) and the second metal wire (30) are integrally formed.

8. A battery string (200), characterized in that, include: The battery cell (100) according to any one of claims 1-7, wherein the plurality of battery cells (100) are spaced apart, and between two battery cells (100), the connecting wire (22) of one battery cell (100) is connected to the first metal wire (20) of the other battery cell (100).

9. The battery string (200) according to claim 8, characterized in that, Between two of the battery cells (100), the connecting wire (22) is inclined relative to the thickness direction of the battery cell body (10) to connect with the first metal wire (20) of the adjacent battery cell (100); and / or, The outermost connecting wire (22) of the outermost battery cell (100) is arranged in the same line as the main wire (21) and is used as the electrode of the battery string (200).

10. A photovoltaic module, characterized in that, include: The battery string (200) according to any one of claims 8-9.

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