Bus bar, solar cell module and photovoltaic system

Abstract

The utility model is suitable for the technical field of solar cells, and provides a bus bar, a solar cell module and a photovoltaic system, and the bus bar comprises a main body part which comprises a first end and a second end which are oppositely arranged; the first bending part is connected with the first end; the first inclined part is connected with the first bending part, the first inclined part extends from the first end to the second end, the first inclined part is bent in the direction close to the main body part, the first inclined part is obliquely arranged relative to the main body part, and a first cavity is formed among the main body part, the first bending part and the first inclined part; and the first lead part is connected with the first inclined part and is bent towards the direction far away from the main body part relative to the first inclined part. The bus bar provided by the utility model can reduce the risk of short circuit caused by the lap joint of the lead part and the adjacent line, can improve the welding reliability of the welding strip and the main body part, can prevent the bus bar from being bent and broken, and improves the structural reliability of the bus bar.

Description

Technical Field

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

[0002] Solar cells, also known as photovoltaic cells, are devices that directly convert light energy into direct current using the photovoltaic effect. In related technologies, multiple solar cells are connected in series, laminated, and encapsulated to form a solar module. A solar module consists of multiple cell strings. Busbars are typically located in the middle or at the edge of the module to weld the solder strips of two cell strings together, connecting them in parallel or series. The busbars are connected to a junction box.

[0003] In related technologies, in order to extract the current from the cell strings of a solar cell module, the ends of the busbar are bent to form a lead portion for insertion into a junction box on the backsheet. For example... Figure 1 As shown, the busbar of the related technology typically includes a main body 310 and a lead portion 311 that connects to one end of the main body 310 and bends relative to the main body 310. The lead portion 311 is usually perpendicular to the edge of the main body 310 and is connected to the junction box 300. Because the lead portion 311 is located at the edge of the main body 310, the lead portion 311 is close to adjacent lines (such as opposite polarity solder strips on adjacent battery strings) and overlaps, causing a short circuit. Moreover, the lead portion 311 is directly perpendicular to the edge of the main body 310, and the connection between the lead portion 311 and the main body 310 is prone to breakage, resulting in poor reliability of the busbar structure. Utility Model Content

[0004] This invention provides a busbar designed to address the problems of short circuits caused by easy contact between the lead wires and adjacent wires in existing solar cell modules, as well as the poor structural reliability of the busbars.

[0005] This invention is implemented by providing a busbar for a solar cell module, comprising:

[0006] The main body includes a first end and a second end disposed opposite to each other;

[0007] The first bend connected to the first end;

[0008] A first inclined portion connected to the first bent portion, the first inclined portion extending from the first end to the second end, the first inclined portion bending towards the main body portion, and the first inclined portion being inclined relative to the main body portion, forming a first cavity between the main body portion, the first bent portion, and the first inclined portion; and

[0009] A first lead portion connected to the first inclined portion is bent away from the main body portion relative to the first inclined portion.

[0010] Preferred options also include:

[0011] The first support portion disposed within the first cavity is used to support the first inclined portion on the main body portion.

[0012] Preferably, the first bend is arc-shaped.

[0013] Preferably, the first bent portion is arranged perpendicular to the main body portion.

[0014] Preferably, a portion of the first inclined portion contacts the main body portion.

[0015] Preferably, the first inclined portion is spaced apart from the main body portion.

[0016] Preferably, the first inclined portion forms a first included angle with the main body portion, and the first included angle is 2° to 60°.

[0017] Preferred options also include:

[0018] The first arc-shaped portion, the first lead portion is connected to the first inclined portion through the first arc-shaped portion.

[0019] Preferred options also include:

[0020] The first contact portion, the first inclined portion and the first lead portion are connected through the first contact portion, and the first contact portion is in contact with the main body portion.

[0021] Preferably, the first contact portion is arranged parallel to the main body portion.

[0022] Preferred options also include:

[0023] The second bend connected to the second end;

[0024] A second inclined portion connected to the second bent portion, the second inclined portion extending from the second end toward the first end, the second inclined portion bending toward the main body portion, the second inclined portion being inclined relative to the main body portion, and a second cavity forming between the main body portion, the second bent portion, and the second inclined portion; and

[0025] The second lead portion is connected to the second inclined portion, and the second lead portion is bent away from the main body portion relative to the second inclined portion.

[0026] Preferred options also include:

[0027] The second support portion disposed within the second cavity is used to support the second inclined portion on the main body portion.

[0028] Preferably, the first inclined portion forms a first angle with the main body portion, and the second inclined portion forms a second angle with the main body portion, wherein the first angle is smaller than the second angle.

[0029] Preferably, the second included angle is 3° to 62°.

[0030] Preferred options also include:

[0031] The second contact portion is connected to the second inclined portion and the second lead portion through the second contact portion, and the second contact portion is in contact with the main body portion.

[0032] Preferably, the second contact portion is arranged parallel to the main body portion.

[0033] Preferred options also include:

[0034] The second arc-shaped portion, the second lead portion is connected to the second inclined portion through the second arc-shaped portion.

[0035] This utility model also provides a solar cell module, comprising:

[0036] A plurality of battery string units are arranged at intervals along a second direction. Each battery string unit includes a first battery string and a second battery string arranged along a first direction. The second direction intersects with the first direction. Both the first battery string and the second battery string include a plurality of battery cells connected in series along the first direction.

[0037] A plurality of intermediate busbars are arranged at intervals along the second direction. The busbars are used to connect the first battery string and the second battery string of the battery string unit in parallel or in series the first battery string or the second battery string adjacent to each other. The intermediate busbars are used to connect the first battery string and the second battery string of each battery string unit in parallel or in series or the battery string in each battery string unit. At least one of the intermediate busbars is the aforementioned busbar.

[0038] This utility model also provides a solar cell module, comprising:

[0039] A plurality of battery string units are arranged at intervals along a second direction. Each battery string unit includes a first battery string and a second battery string arranged along a first direction. The second direction intersects with the first direction. Both the first battery string and the second battery string include a plurality of battery cells connected in series along the first direction. The battery string unit includes a first battery string unit, a second battery string unit, a third battery string unit, a fourth battery string unit, a fifth battery string unit, and a sixth battery string unit arranged at intervals along the second direction.

[0040] A plurality of intermediate busbars are arranged at intervals along the second direction, the intermediate busbars including a first busbar, a second busbar, a third busbar, and a fourth busbar arranged at intervals along the second direction; the first busbar is used to connect the first battery string and the second battery string of the first battery string unit in parallel, the second busbar is used to connect the first battery string and the second battery string of the second battery string unit and the third battery string unit in parallel, the third busbar is used to connect the first battery string and the second battery string of the fourth battery string unit and the fifth battery string unit in parallel, and the fourth busbar is used to connect the first battery string and the second battery string of the sixth battery string unit in parallel;

[0041] The first busbar and the fourth busbar are the busbars described above, as are the second busbar and the third busbar; the first lead portion of the first busbar is disposed close to the second lead portion of the second busbar, the first lead portion of the second busbar is disposed close to the second lead portion of the third busbar, and the first lead portion of the third busbar is disposed close to the first lead portion of the fourth busbar.

[0042] This invention also provides a photovoltaic system, including the aforementioned solar cell module.

[0043] This utility model provides a busbar with a first bent portion and a first inclined portion. Due to the arrangement of the first bent portion and the first inclined portion, the first lead portion is not located at the outermost edge of the main body, thereby reducing the risk of short circuit caused by the first lead portion overlapping with adjacent lines. Moreover, during the lamination process, the force generated by the first lead portion can be offset by the first bent portion and the first inclined portion, preventing the end of the main body connected to the first lead portion from lifting up, thereby improving the welding reliability of the solder strip to the main body. At the same time, since the first inclined portion is inclined relative to the main body, a first cavity is formed between the main body, the first bent portion, and the first inclined portion. The first cavity plays a buffering role for the busbar during the lamination process of the solar cell module, which can prevent the first bent portion and the first inclined portion from being broken, thereby improving the structural reliability of the busbar. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the connection structure between the junction box and the busbar in a solar cell module in related technologies;

[0045] Figure 2 This is a schematic diagram of the structure of the first type of busbar provided in Embodiment 1 of this utility model;

[0046] Figure 3 This is a schematic diagram of the structure of the second type of busbar provided in Embodiment 1 of this utility model;

[0047] Figure 4 This is a schematic diagram of the structure of the third type of busbar provided in Embodiment 1 of this utility model;

[0048] Figure 5 This is a schematic diagram of the structure of the first type of busbar provided in Embodiment 2 of this utility model;

[0049] Figure 6 This is a schematic diagram of the structure of the second type of busbar provided in Embodiment 2 of this utility model;

[0050] Figure 7 This is a schematic diagram of the structure of the third type of busbar provided in Embodiment 2 of this utility model;

[0051] Figure 8 This is a plan view of the solar cell module provided in Embodiment 3 of this utility model;

[0052] Figure 9 yes Figure 8 Enlarged diagram of point IV in the middle;

[0053] Figure 10 This is a schematic diagram of the intermediate busbar of the solar cell module provided in Embodiment 3 of this utility model. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as limiting the present utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0055] In the description of this utility model, it should be understood that the terms "upper", "lower", "back", "front", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0056] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "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. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0058] Example 1

[0059] Please see Figure 2 This utility model provides a busbar for use in solar cell modules, comprising:

[0060] The main body 21 includes a first end 211 and a second end 212 disposed opposite to each other;

[0061] The first bend 22 is connected to the first end 21;

[0062] A first inclined portion 23 connected to the first bent portion 22 extends from the first end 211 toward the second end 212, bends toward the main body portion 21, and is inclined relative to the main body portion 21. A first cavity 26 is formed between the main body portion 21, the first bent portion 22, and the first inclined portion 23.

[0063] The first lead portion 24, which is connected to the first inclined portion 23, is bent away from the main body portion 21 relative to the first inclined portion 23.

[0064] The busbar of this embodiment can be used as the middle busbar of a solar cell module. Of course, it can also be used as the edge busbar of a solar cell module.

[0065] This utility model provides a busbar that, by providing a first bent portion 22 and a first inclined portion 23, with the first inclined portion 23 extending from the first end 211 towards the second end 212, ensures that the first lead portion 24 is not located at the outermost edge of the main body 21, thereby reducing the risk of short circuits caused by the first lead portion 24 overlapping with adjacent lines (such as opposite polarity solder strips). Furthermore, due to the presence of the first bent portion 22 and the first inclined portion 23, the force generated by the first lead portion 24 during the lamination process of the solar cell module is reduced. The first bending portion 22 and the first inclined portion 23 can be offset to prevent the end of the main body portion 21 connected to the first lead portion 24 from lifting up, thereby ensuring the welding reliability of the solder strip to the main body portion 21; moreover, since the first inclined portion 23 is inclined relative to the main body portion 21, a first cavity 26 is formed between the main body portion 21, the first bending portion 22, and the first inclined portion 23. The first cavity 26 plays a buffering role during the lamination process, which can prevent the first bending portion 22 and the first inclined portion 23 from being broken, thereby improving the reliability of the busbar structure.

[0066] In this embodiment, the first inclined portion 23 can be arranged in a straight shape, that is, the upper and lower surfaces of the first inclined portion 23 are two parallel planes. The first inclined portion 23 is inclined relative to the main body portion 21, meaning that the first inclined portion 23 and the main body portion 21 are not parallel in the Z-direction. This reduces the force transmitted from the first lead portion 24 to the main body portion 21, preventing the end of the main body portion 21 connected to the first lead portion 24 from lifting up, thereby ensuring the welding reliability of the solder strip to the main body portion 21. Furthermore, because the first inclined portion 23 is inclined relative to the main body portion 21, compared to a parallel arrangement, the contact area between the first inclined portion 23 and the main body portion 21 during the lamination process can be reduced, providing a good buffering effect.

[0067] Specifically, the busbar is made of metal, such as aluminum, copper, or tin, etc., and there are no restrictions on the specific type.

[0068] As one embodiment of this utility model, it also includes:

[0069] The first support portion 27, which is disposed in the first cavity 26, is used to support the first inclined portion 23 on the main body portion 21.

[0070] In this embodiment, by providing a first support portion 27 in the first cavity 26 and fixing the first support portion 27 in the first cavity 26, the first inclined portion 23 is supported on the main body portion 21 by the first support portion 27, so that the inclined shape of the first inclined portion 23 is maintained during the lamination of the solar cell module, and the first cavity 26 plays a good buffering role.

[0071] In one embodiment of this utility model, the first support portion 27 can be a conductive support portion or an insulating support portion. The hardness of the first support portion 27 is less than that of the first inclined portion 23, allowing the first support portion 27 to provide better cushioning. Furthermore, the specific structure of the first support portion 27 is not limited; it can be a plastic bracket or a metal spring.

[0072] In one embodiment of this utility model, the first bending portion 22 is arc-shaped. The outer surface contour of the first bending portion 22 is arc-shaped, and the inner surface contour of the first bending portion 22 is also arc-shaped. This arc shape can be a standard arc or a non-standard arc; that is, the outer surface contour of the first bending portion 22 can be an arc with a single radius, or it can be formed by connecting multiple arcs with different radii. Since the outer and inner surface contours of the first bending portion 22 are arc-shaped, and are not parallel to the main body portion 21, the stress at the connection between the first inclined portion 23 and the main body portion 21 can be reduced, preventing breakage at the connection and improving the reliability of the busbar structure.

[0073] Please refer to Figure 3 In another embodiment of this utility model, the first bending portion 22 is straight and is arranged perpendicularly to the main body portion 21.

[0074] In this embodiment, the first bending portion 22 is straight and is arranged perpendicularly to the main body portion 21, which facilitates the bending process of the first bending portion 22.

[0075] Please refer to Figure 2 and Figure 3 As an embodiment of the present invention, a portion of the first inclined portion 23 contacts the main body portion 21.

[0076] In this embodiment, since a portion of the first inclined portion 23 contacts the main body portion 21, the main body portion 21 can support a portion of the first inclined portion 23, preventing deformation of the first inclined portion 23 during lamination and maintaining its good shape. Specifically, the end of the first inclined portion 23 closest to the first lead portion 24 contacts the main body portion 21.

[0077] In another embodiment of this utility model, the first inclined portion 23 can also be spaced apart from the main body portion 21, that is, the first inclined portion 23 and the main body portion 21 are not in contact at all. This can increase the buffering effect of the first inclined portion 23 and further prevent the first bent portion 22 from breaking, thereby improving the reliability of the busbar structure. In practical applications, the distance between the first inclined portion 23 and the main body portion 21 is not limited; for example, the distance between the first inclined portion 23 and the main body portion 21 can be 0.05 to 0.1 mm.

[0078] Please refer to Figures 2-3 As one embodiment of this utility model, it also includes:

[0079] The first arc-shaped portion 25 and the first lead portion 24 are connected to the first inclined portion 23 through the first arc-shaped portion 25.

[0080] In this embodiment, the first lead portion 24 is connected to the first inclined portion 23 via the first arc-shaped portion 25. The first arc-shaped portion 25 helps prevent the first lead portion 24 from breaking, thus improving the reliability of the busbar structure. Alternatively, the first lead portion 24 and the first inclined portion 23 can be directly connected, i.e., without the first arc-shaped portion 25, the first inclined portion 23 and the first lead portion 24 are connected at a certain angle.

[0081] Please refer to Figure 4 As one embodiment of this utility model, it also includes:

[0082] The first contact portion 28, the first inclined portion 23 and the first lead portion 24 are connected through the first contact portion 28, and the first contact portion 28 is in contact with the main body portion 21.

[0083] In this embodiment, the first inclined portion 23 and the first lead portion 24 are connected by the first contact portion 28. Since the first contact portion 28 is in contact with the main body portion 21, the structural strength of the main body portion 21 can be increased, preventing deformation of the main body portion 21 during the lamination of the solar cell module and improving the reliability of the busbar during the lamination process. In some embodiments, the first inclined portion 23 and the first lead portion 24 can be directly connected or connected to each other through a connecting portion, such as through the first contact portion 28. This invention does not limit this. When the first inclined portion 23 and the first lead portion 24 are connected through the first contact portion 28, a first support portion 27 can also be provided in the first cavity 26 formed between the first bent portion 22 and the first inclined portion 23 to support the first inclined portion 23 on the main body portion 21.

[0084] In one embodiment of this utility model, the first contact portion 28 is arranged in parallel with the main body portion 21.

[0085] In this embodiment, the first contact portion 28 is parallel to and attached to the main body portion 21, and the length direction of the first contact portion 28 is the same as the length direction of the main body portion 21. During the lamination process of the solar cell module, the main body portion 21 supports the first contact portion 28, making the lamination process more reliable and facilitating the processing of the busbar. The first contact portion 28 is generally straight, meaning that the contact surfaces of the first contact portion 28 and the main body portion 21 are parallel to each other.

[0086] In one embodiment of this utility model, the first lead wire portion 24 is arranged perpendicularly to the main body portion 21, which facilitates the connection of the first lead wire portion 24 to the junction box 30.

[0087] As one embodiment of the present invention, the height of the first cavity 26 gradually decreases from the first end 211 to the second end 212.

[0088] In this embodiment, the height of the first cavity 26 is the distance from the surface of the first inclined portion 23 near the main body portion 21 to the main body portion 21. Since the height of the first cavity 26 gradually decreases from the first end 211 to the second end 212, it can be understood that the distance from the surface of the first inclined portion 23 near the main body portion 21 to the main body portion 21 gradually decreases, which can further improve the buffering effect and reduce the force transmitted from the first lead portion 24 to the main body portion 21.

[0089] Please refer to Figures 2-4 As an embodiment of the present utility model, the first inclined portion 23 and the main body portion 21 form a first included angle A1, the first included angle A1 being 2° to 60°.

[0090] In this embodiment, with the first inclined portion 23 inclined relative to the main body portion 21, the angle between the first inclined portion 23 and the main body portion 21 is controlled to be 2° to 60°. This allows the angle A1 between the first inclined portion 23 and the main body portion 21 to be set within a suitable range, which can effectively prevent the first inclined portion 23 from breaking and prevent the main body portion 21 from warping, resulting in poor welding.

[0091] Example 2

[0092] Please refer to Figures 5-7 As one embodiment of this utility model, the busbar further includes:

[0093] The second bend 32 is connected to the second end 212;

[0094] A second inclined portion 33 connected to the second bent portion 32 extends from the second end 212 toward the first end 211, bends toward the main body portion 21, is inclined relative to the main body portion 21, and forms a second cavity 36 between the main body portion 21, the second bent portion 32, and the second inclined portion 33; and

[0095] The second lead portion 34, which is connected to the second inclined portion 33, is bent away from the main body portion 21 relative to the second inclined portion 33.

[0096] The busbar of this utility model embodiment can be used as the middle busbar of a solar cell module, or as the edge busbar of a solar cell module. The first lead portion 24 and the second lead portion 34 are respectively connected to the junction box of the solar cell module.

[0097] The busbar of this embodiment is provided with a first bent portion 22 and a first inclined portion 23, and a second bent portion 32 and a second inclined portion 33, so that neither the first lead portion 24 nor the second lead portion 34 is located at the outermost edge of the main body portion 21, thereby reducing the risk of short circuit caused by the first lead portion 24 and the second lead portion 34 overlapping with adjacent lines (such as opposite polarity solder strips); on the other hand, during the lamination process, the force generated by the first lead portion 24 can be offset by the first bent portion 22 and the first inclined portion 23, and the force generated by the second lead portion 34 can be offset by the first bent portion 22 and the first inclined portion 23. The second bend 32 and the second inclined portion 33 offset each other, preventing the end of the main body 21 near the first lead portion 24 and the end of the main body 21 near the second lead portion 34 from warping, thereby ensuring the welding reliability of the solder strip and the main body 21; moreover, since the second inclined portion 33 is inclined relative to the main body 21, the main body 21, the second bend 32 and the second inclined portion 33 form a second cavity 36. The second cavity 36 plays a buffering role during the lamination process, which can prevent the second bend 32 and the second inclined portion 33 from being broken, thereby improving the reliability of the busbar structure.

[0098] In one embodiment of this utility model, a second support portion 37 is provided within the second cavity 36. In this embodiment, by providing the second support portion 37 within the second cavity 36, the second support portion 37 supports the second inclined portion 33, maintaining the structure of the second cavity 36 during lamination, thereby enabling the second cavity 36 to provide a good buffering effect. The structure of the second support portion 37 can be the same as that of the first support portion 27. Of course, the structure of the second support portion 37 can also be different from that of the first support portion 27.

[0099] As an embodiment of the present invention, the second inclined portion 33 and the main body portion 21 form a second included angle A2, and the first included angle A1 is smaller than the second included angle A2.

[0100] In this embodiment, the first included angle A1 is smaller than the second included angle A2, that is, the included angle between the first inclined portion 23 and the main body portion 21 is smaller than the included angle between the second inclined portion 33 and the main body portion 21, making the inclination angles of the second inclined portion 33 and the first inclined portion 23 different, which facilitates the assembly and connection between the busbar and the junction box. Moreover, the first included angle A1 being smaller than the second included angle A2 helps to increase the distance from the first lead portion 24 to the outer end of the first bent portion 22, thereby improving the buffering effect of the first lead portion 24, facilitating stress release of the busbar, and reducing the risk of busbar breakage. In practical applications, the specific difference between the second included angle A2 and the first included angle A1 is not limited; for example, the difference between the second included angle A2 and the first included angle A1 is greater than 1°.

[0101] In one embodiment of the present invention, the distance from the first lead portion 24 to the outer end of the first bend portion 22 is greater than the distance from the second lead portion 34 to the outer end of the second bend portion 32.

[0102] In this embodiment, the outer end of the first bent portion 22 refers to the endpoint of the first bent portion 22 furthest from the first lead portion 24 along the length direction Z of the main body portion 21, and the distance from the first lead portion 24 to the outer end of the first bent portion 22 is L1; the outer end of the second bent portion 32 refers to the endpoint of the second bent portion 32 furthest from the second lead portion 34 along the length direction Z of the main body portion 21, and the distance from the second lead portion 34 to the outer end of the second bent portion 32 is L2. The distance L1 from the first lead portion 24 to the outer end of the first bent portion 22 is greater than the distance L2 from the second lead portion 34 to the outer end of the second bent portion 32.

[0103] In some embodiments, when the solar cell module uses at least two of the busbars as intermediate busbars, the first lead portion 24 of the first busbar and the second lead portion 34 of the second busbar are arranged adjacent to each other, and the first lead portion 24 of the first busbar and the second lead portion 34 of the second busbar are inserted into the same junction box. Since the distance L1 from the first lead portion 24 of the first busbar to the outer end of the first bend portion 22 of the first busbar is greater than the distance L2 from the second lead portion 34 of the second busbar to the outer end of the second bend portion 32 of the second busbar, the deformation space of the first lead portion 24 of the first busbar can be increased, the stress buffering effect of the first lead portion 24 of the first busbar can be improved, and the stress release after the first lead portion 24 of the first busbar and the second lead portion 34 of the second busbar are inserted into the same junction box can be facilitated, thus avoiding the breakage of the busbar. In addition, the creepage distance between the first lead portion 24 of the first busbar and the second lead portion 34 of the second busbar can be increased, the isolation effect between the first lead portion 24 of the first busbar and the second lead portion 34 of the second busbar can be increased, and the working reliability of the solar cell module can be improved.

[0104] Please refer to Figures 5-7As one embodiment of this utility model, the second included angle A2 is 3° to 62°.

[0105] In this embodiment, controlling the second included angle A2 to be 3 to 62° allows the included angle A2 between the second inclined portion 33 and the main body portion 21 to be set within a more suitable range. This can effectively prevent the second inclined portion 33 from breaking and prevent the main body portion 21 from warping, which would lead to poor welding. It also facilitates the formation of a difference from the first included angle A1, which helps to increase the stress buffering effect of the first lead portion 24.

[0106] Please refer to Figures 5-6 As an embodiment of this utility model, both the first bending portion 22 and the second bending portion 32 are arc-shaped, which can reduce the stress at the connection between the first inclined portion 23 and the main body portion 21 and the second inclined portion 33 and the main body portion 21, and can prevent the connection between the first inclined portion 23 and the main body portion 21 and the second inclined portion 33 and the main body portion 21 from being broken, thereby improving the reliability of the busbar structure.

[0107] Please refer to Figure 6 As one embodiment of this utility model, it also includes:

[0108] The second contact portion 38, the second inclined portion 33 and the second lead portion 34 are connected through the second contact portion 38, and the second contact portion 38 is in contact with the main body portion 21.

[0109] In this embodiment, the second inclined portion 33 and the second lead portion 34 are connected by the second contact portion 38. Since the second contact portion 38 is in contact with the main body portion 21, the structural strength of the main body portion 21 can be increased, preventing deformation of the main body portion 21 during lamination and improving the reliability of the lamination process. In some embodiments, the second inclined portion 33 and the second lead portion 34 can be directly connected or connected to each other through a connecting portion, such as through the second contact portion 38. This invention does not limit this. When the second inclined portion 33 and the second lead portion 34 are connected through the second contact portion 38, a second support portion 37 can also be provided in the second cavity 36 formed between the second bent portion 32 and the second inclined portion 33 to support the second inclined portion 33 on the main body portion 21.

[0110] In one embodiment of this utility model, the second contact portion 38 is arranged parallel to the main body portion 21.

[0111] In this embodiment, the second contact portion 38 is parallel to and attached to the main body portion 21. During the lamination process, the main body portion 21 can support the second contact portion 38, making the lamination process more reliable and facilitating the processing of the busbar. The second contact portion 38 is generally straight.

[0112] Please refer to Figure 7As one embodiment of this utility model, it also includes:

[0113] The second arc-shaped portion 35 and the second lead portion 34 are connected to the second inclined portion 33 through the second arc-shaped portion 35.

[0114] In this embodiment, the second arc-shaped portion 35 helps to reduce the bending force of the second lead portion 34 on the main body portion 21, which can prevent the second lead portion 34 from being broken during the bending process and improve the reliability of the busbar structure.

[0115] In this embodiment, the outer surface contour of the second arc-shaped portion 35 is arc-shaped, and the inner surface contour of the second arc-shaped portion 35 is also arc-shaped. This arc shape can be a standard arc shape or a non-standard arc shape. That is, the outer surface contour of the second arc-shaped portion 35 can be an arc shape with a single radius or it can be formed by connecting multiple arc shapes with different radii. Of course, in some possible embodiments, the second arc-shaped portion 25 may not be necessary, and the second lead portion 34 and the second inclined portion 33 can be directly connected. The specific connection method is the same as the example above and will not be repeated here.

[0116] Please refer to Figure 7 In another embodiment of this utility model, the second bending portion 32 is straight and is arranged perpendicularly to the main body portion 21.

[0117] In this embodiment, the second bending portion 32 is straight and is arranged perpendicularly to the main body portion 21, which facilitates the bending process of the second bending portion 32. The second bending portion 32 may have the same structure as the first bending portion 22, or it may be different.

[0118] Example 3

[0119] Please see Figure 8 and Figure 9 This utility model provides a solar cell module 100, which includes a plurality of solar cells 110. The solar cells 110 can be back contact solar cells, Topcon solar cells, or other types, and are not limited here.

[0120] like Figure 8 As shown, the solar cell module 100 may include a plurality of battery string units 10 arranged at intervals along a second direction X. Each battery string unit 10 includes a first battery string 11 and a second battery string 12 arranged along a first direction Y. The second direction X intersects with the first direction Y. Both the first battery string 11 and the second battery string 12 include a plurality of battery cells 110 connected in series along the first direction Y.

[0121] Multiple busbars are used to connect the first battery string 11 and the second battery string 12 of the battery string unit 10 in parallel or to connect adjacent first battery strings 11 or adjacent second battery strings 12 in series. At least one busbar is a busbar of the above embodiment one or embodiment two.

[0122] In practical applications, multiple busbars may include a middle busbar 20, a first edge busbar 40, and a second edge busbar 50. The middle busbar 20 is used to connect the first battery string 11 and the second battery string 12 of the battery string unit 10 in parallel. The first edge busbar 40 is used to connect the first battery string 11 of the adjacent battery string unit 10 in series. The second edge busbar 50 is used to connect the second battery string 12 of the adjacent battery string unit 10 in series.

[0123] Specifically, the solar cell module 100 includes a plurality of intermediate busbars 20, at least one of which is a busbar of the above embodiment one or embodiment two. The intermediate busbars 20 are used to connect the first battery string 11 and the second battery string 12 of each battery string unit 10 in parallel. Among them, at least one intermediate busbar 20 at the edge position adopts the busbar of the above embodiment one, and at least one intermediate busbar 20 at the middle position is the busbar of the above embodiment two.

[0124] In this embodiment of the invention, multiple solar cells 110 in the solar cell module 100 can be connected in series to form multiple cell strings. These cell strings can be combined in series and parallel to achieve current collection and output. For example, the connection between the individual solar cells 110 can be achieved by welding solder strips, and the series and parallel connections between the cell strings can be achieved by a central busbar 20, a first edge busbar 40, and a second edge busbar 50. The cell strings can form a solar cell array, which is then encapsulated together with a front panel, a front encapsulant film, a rear encapsulant film, and a back panel to form the solar cell module 100.

[0125] like Figure 8 and Figure 9 As shown, the solar cell module 100 also includes a junction box 30. An intermediate busbar 20 is located between the first battery string 11 and the second battery string 12. The intermediate busbar 20 is used to connect the first battery string 11 and the second battery string 12 in parallel; that is, both the first battery string 11 and the second battery string 12 are connected to the intermediate busbar 20, and the polarities of the first battery string 11 and the second battery string 12 are the same. The junction box 30 is disposed on the back panel of the solar cell module 100, and a bypass diode is provided inside the junction box 30.

[0126] At least one busbar in the solar cell module of this utility model embodiment is the busbar of Embodiment 1 or Embodiment 2 above. This can reduce the risk of short circuit caused by the overlap between the intermediate busbar and adjacent lines (such as opposite polarity solder strips), and can ensure the welding reliability of the solder strip and the main body 21 during the lamination process of the solar cell module. It can also prevent the intermediate busbar from being broken, thereby improving the reliability of the busbar structure and the reliability of the solar cell module.

[0127] like Figure 8 As shown, in the solar cell module 100, the solar cell module 100 may have multiple battery string units 10, which are arranged along a second direction X. The first direction Y may be the longitudinal direction of the solar cell module 100, and the second direction X may be the transverse direction of the solar cell module 100. In the multiple battery string units 10, adjacent first battery strings 11 are connected in pairs via first edge busbars 40, and adjacent second battery strings 12 are connected in pairs via second edge busbars 50. Adjacent first battery strings 11 not connected by the first edge busbars 40 are connected in pairs via intermediate busbars 20, and adjacent second battery strings 12 not connected by the second edge busbars 50 are connected in pairs via intermediate busbars 20. In some embodiments, the first battery strings 11 and the second battery strings 12 may be symmetrical about the centerline of the solar cell module 100 in the first direction Y.

[0128] Specifically, Figure 8 The diagram shows a case where the number of battery string units 10 is six, meaning that the battery string unit 10 includes a first battery string unit 101, a second battery string unit 102, a third battery string unit 103, a fourth battery string unit 104, a fifth battery string unit 105, and a sixth battery string unit 106 arranged sequentially at intervals along the second direction X. In this case, as... Figure 8 and Figure 9 As shown, there are 3 first edge busbars 40, 3 second edge busbars 50, 4 intermediate busbars 20, and 3 junction boxes 30. A junction box 30 is provided between each pair of adjacent intermediate busbars 20. In each pair of adjacent intermediate busbars 20, one busbar 20 is connected to the positive terminal of the junction box 30, and the other is connected to the negative terminal of the junction box 30. Figure 9 As shown, among the four intermediate busbars 20, the two intermediate busbars 20 located at the two edges of the second direction X are short intermediate busbars, and the two intermediate busbars 20 located in the middle are long intermediate busbars. The short intermediate busbars are connected to the positive or negative terminal of a junction box 30 at only one end, while the long intermediate busbars are connected to the positive terminal of a junction box 30 at one end and to the negative terminal of another junction box 30 at the other end.

[0129] As one embodiment of this utility model, the solar cell module includes:

[0130] A plurality of battery string units 10 are arranged at intervals along the second direction X. Each battery string unit 10 includes a first battery string 11 and a second battery string 12 arranged along the first direction Y. The second direction X intersects with the first direction Y. The first battery string 11 and the second battery string 12 both include a plurality of battery cells 110 connected in series along the first direction Y.

[0131] The battery string unit 10 includes a first battery string unit 101, a second battery string unit 102, a third battery string unit 103, a fourth battery string unit 104, a fifth battery string unit 105, and a sixth battery string unit 106 arranged sequentially and spaced apart along the second direction X; the solar cell module includes a central bus bar 20, which includes a first bus bar 201, a second bus bar 202, a third bus bar 203, and a fourth bus bar 204 arranged sequentially and spaced apart along the second direction X. The first bus bar 201 connects the first battery string 11 and the second battery string 12 of the first battery string unit 101 in parallel. The second bus bar 202 connects the first battery string 11 and the second battery string 12 of the second battery string unit 102 and the third battery string unit 103 in parallel. The third bus bar 203 connects the first battery string 11 and the second battery string 12 of the fourth battery string unit 104 and the fifth battery string unit 105 in parallel. The fourth bus bar 204 connects the first battery string 11 and the second battery string 12 of the sixth battery string unit 106 in parallel.

[0132] The first busbar 201 and the fourth busbar 204 are the busbars of the first embodiment described above, and the second busbar 202 and the third busbar 203 are the busbars of the second embodiment described above. The first lead portion 24 of the first busbar 201 is disposed near the second lead portion 34 of the second busbar 202, the first lead portion 24 of the second busbar 202 is disposed near the second lead portion 34 of the third busbar 203, and the first lead portion 24 of the third busbar 203 is disposed near the first lead portion 24 of the fourth busbar 204.

[0133] In this embodiment, the first busbar 201 and the fourth busbar 204 in the solar cell module are configured as the busbars of the first embodiment described above, and the second busbar 202 and the third busbar 203 are configured as the busbars of the second embodiment described above. This reduces the risk of short circuits caused by the overlap of each intermediate busbar 20 with adjacent lines (e.g., opposite polarity solder strips), and ensures the welding reliability of the solder strips to the main body 21 of each intermediate busbar 20 during the lamination process of the solar cell module. It also prevents each intermediate busbar 20 from being broken, thereby improving the structural reliability of each intermediate busbar 20 and the reliability of the solar cell module.

[0134] As an embodiment of the present utility model, the distance from the first lead portion 24 of the first busbar 201 to the outer end of the first bend portion 22 of the first busbar 201, the distance from the first lead portion 24 of the second busbar 202 to the outer end of the first bend portion 22 of the second busbar 202, and the distance from the first lead portion 24 of the third busbar 203 to the outer end of the first bend portion 22 of the third busbar 203 are equal;

[0135] The distance from the second lead portion 34 of the second busbar 202 to the outer end of the second bend portion 32 of the second busbar 202, the distance from the second lead portion 34 of the third busbar 203 to the outer end of the second bend portion 32 of the third busbar 203, and the distance from the first lead portion 24 of the fourth busbar 204 to the outer end of the first bend portion 22 of the fourth busbar 204 are equal;

[0136] The distance from the first lead portion 24 of the first busbar 201 to the outer end of the first bend portion 22 of the first busbar 201 is greater than the distance from the second lead portion 34 of the second busbar 202 to the outer end of the second bend portion 32 of the second busbar 202.

[0137] In this embodiment, the outer end of the first bend 22 of the first busbar 201 is the endpoint of the first bend 22 of the first busbar 201 that is furthest from the first lead portion 24 of the first busbar 201 in the length direction Z of the main body 21; the outer end of the first bend 22 of the second busbar 202 is the endpoint of the first bend 22 of the second busbar 202 that is furthest from the first lead portion 24 of the second busbar 202 in the length direction Z of the main body 21; the outer end of the first bend 22 of the third busbar 203 is the first bend of the third busbar 203. The endpoint of the first lead portion 24 of the third busbar 203 is furthest from the length of the main body portion 21 in the Z direction. The outer end of the second bend portion 32 of the third busbar 203 is the endpoint of the second lead portion 34 of the third busbar 203 furthest from the length of the main body portion 21 in the Z direction. The outer end of the first bend portion 22 of the fourth busbar 204 is the endpoint of the first lead portion 24 of the fourth busbar 204 furthest from the length of the main body portion 21 in the Z direction.

[0138] The distances from the first lead portion 24 of the first busbar 201 to the outer end of the first bend portion 22 of the first busbar 201, the distances from the first lead portion 24 of the second busbar 202 to the outer end of the first bend portion 22 of the second busbar 202, and the distances from the first lead portion 24 of the third busbar 203 to the outer end of the first bend portion 22 of the third busbar 203 are S1, S2, and S3 respectively; the distances from the second lead portion 34 of the second busbar 202 to the outer end of the first bend portion 22 of the third busbar 203 are S1, S2, and S3 respectively. The distances from the outer end of the second bend 32 of the 02, the distance from the second lead 34 of the third busbar 203 to the outer end of the second bend 32 of the second busbar 202, and the distance from the first lead 24 of the fourth busbar 204 to the outer end of the first bend 22 of the fourth busbar 204 are equal and correspond to S4, S5, and S6 respectively; wherein, S1, S2, and S3 are all equal, S4, S5, and S6 are all equal, and S1, S2, and S3 are all greater than S4, S5, and S6.

[0139] In this embodiment, the first lead portion 24 of the first busbar 201 and the second lead portion 34 of the second busbar 202 are inserted into the first junction box 301, the first lead portion 24 of the second busbar 202 and the second lead portion 34 of the third busbar 203 are inserted into the second junction box 302, and the first lead portion 24 of the third busbar 203 is inserted into the third junction box 303 near the first lead portion 24 of the fourth busbar 204. Since the distance S1 from the first lead portion 24 of the first busbar 201 to the outer end of the first bend portion 22 of the first busbar 201 is greater than the distance S4 from the second lead portion 34 of the second busbar 202 to the outer end of the second bend portion 32 of the second busbar 202, the deformation buffer space of the first lead portion 24 of the first busbar 201 can be increased, and the stress buffering effect of the first lead portion 24 of the first busbar 201 can be increased. This facilitates stress release after the first lead portion 24 of the first busbar 201 and the second lead portion 34 of the second busbar 202 are inserted into the first junction box 301, preventing the first busbar 201 and the second busbar 202 from breaking. Furthermore, it increases the creepage distance between the first lead portion 24 of the first busbar 201 and the second lead portion 34 of the second busbar 202, increases the electrical isolation effect between the first lead portion 24 of the first busbar 201 and the second lead portion 34 of the second busbar 202, and improves the working reliability of the solar cell module.

[0140] Similarly, the first lead portion 24 of the second busbar 202 and the second lead portion 34 of the third busbar 203 are inserted into the second junction box 302, and S2 is greater than S5. This can increase the deformation buffer space of the first lead portion 24 of the second busbar 202, improve the stress buffering effect of the first lead portion 24 of the second busbar 202, prevent the second busbar 202 from breaking, increase the electrical isolation effect between the second busbar 202 and the second busbar 203, and improve the working stability of the solar cell module.

[0141] When the first lead portion 24 of the third busbar 203 and the first lead portion 24 of the fourth busbar 204 are inserted into the third junction box 303, and S3 is greater than S6, the deformation buffer space of the first lead portion 24 of the third busbar 203 can be increased, the stress buffering effect of the first lead portion 24 of the third busbar 203 can be improved, the breakage of the third busbar 203 and the fourth busbar 204 can be avoided, the electrical isolation effect between the third busbar 203 and the fourth busbar 204 can be increased, and the working stability of the solar cell module can be improved.

[0142] Of course, in some other embodiments, the distance from the first lead portion 24 of the first busbar 201 to the outer end of the first bend portion 22 of the first busbar 201 may be less than the distance from the second lead portion 34 of the second busbar 202 to the outer end of the second bend portion 32 of the second busbar 202. That is, S1, S2, and S3 are all equal, S4, S5, and S6 are all equal, and S1, S2, and S3 are all less than S4, S5, and S6. Similarly, the difference between S4 and S1 can be 0.1 to 1 mm, that is, the difference between S4 and S1, the difference between S5 and S2, and the difference between S6 and S3 are all 0.1 to 1 mm.

[0143] Example 4

[0144] This utility model embodiment also provides a photovoltaic system, which includes the solar cell module of the above embodiment. It should be noted that the photovoltaic system has the same or similar beneficial effects as the solar cell module described above, and the related parts between the two can be referred to each other. To avoid repetition, they will not be described again here.

[0145] In this embodiment, the photovoltaic system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system grid as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple back-contact solar cell modules. For example, multiple back-contact solar cell modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0146] In the description of this specification, the references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0147] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A busbar for use in a solar cell module, characterized in that, include: The main body includes a first end and a second end disposed opposite to each other; The first bend connected to the first end; A first inclined portion connected to the first bent portion, the first inclined portion extending from the first end to the second end, the first inclined portion bending towards the main body portion, and the first inclined portion being inclined relative to the main body portion, and a first cavity being formed between the main body portion, the first bent portion, and the first inclined portion; and A first lead portion connected to the first inclined portion is bent away from the main body portion relative to the first inclined portion.

2. The busbar according to claim 1, characterized in that, Also includes: The first support portion disposed within the first cavity is used to support the first inclined portion on the main body portion.

3. The busbar according to claim 1, characterized in that, The first bend is arc-shaped.

4. The busbar according to claim 1, characterized in that, The first bent portion is positioned perpendicular to the main body portion.

5. The busbar according to claim 1, characterized in that, A portion of the first inclined portion contacts the main body portion.

6. The busbar according to claim 1, characterized in that, The first inclined portion is spaced apart from the main body portion.

7. The busbar according to claim 1, characterized in that, The first inclined portion forms a first angle with the main body portion, and the first angle is 2° to 60°.

8. The busbar according to claim 1, characterized in that, Also includes: The first arc-shaped portion, the first lead portion is connected to the first inclined portion through the first arc-shaped portion.

9. The busbar according to claim 1, characterized in that, Also includes: The first contact portion, the first inclined portion and the first lead portion are connected through the first contact portion, and the first contact portion is in contact with the main body portion.

10. The busbar according to claim 9, characterized in that, The first contact portion is arranged parallel to the main body portion.

11. The busbar according to any one of claims 1 to 10, characterized in that, Also includes: The second bend connected to the second end; A second inclined portion connected to the second bent portion, the second inclined portion extending from the second end toward the first end, the second inclined portion bending toward the main body portion, the second inclined portion being inclined relative to the main body portion, and a second cavity being formed between the main body portion, the second bent portion, and the second inclined portion; and The second lead portion is connected to the second inclined portion, and the second lead portion is bent away from the main body portion relative to the second inclined portion.

12. The busbar according to claim 11, characterized in that, Also includes: The second support portion disposed within the second cavity is used to support the second inclined portion on the main body portion.

13. The busbar according to claim 11, characterized in that, The first inclined portion forms a first angle with the main body portion, and the second inclined portion forms a second angle with the main body portion, wherein the first angle is smaller than the second angle.

14. The busbar according to claim 13, characterized in that, The second included angle is 3° to 62°.

15. The busbar according to claim 11, characterized in that, Also includes: The second contact portion is connected to the second inclined portion and the second lead portion through the second contact portion, and the second contact portion is in contact with the main body portion.

16. The busbar according to claim 15, characterized in that, The second contact portion is arranged parallel to the main body portion.

17. The busbar according to claim 11, characterized in that, Also includes: The second arc-shaped portion, the second lead portion is connected to the second inclined portion through the second arc-shaped portion.

18. A solar cell module, characterized in that, include: A plurality of battery string units are arranged at intervals along a second direction. Each battery string unit includes a first battery string and a second battery string arranged along a first direction. The second direction intersects with the first direction. Both the first battery string and the second battery string include a plurality of battery cells connected in series along the first direction. and Multiple busbars are provided, wherein the busbars are used to connect the first battery string and the second battery string of the battery string unit in parallel or to connect adjacent first battery strings or adjacent second battery strings in series, and at least one of the busbars is a busbar as described in any one of claims 1 to 17.

19. A solar cell module, characterized in that, include: A plurality of battery string units are arranged at intervals along a second direction. Each battery string unit includes a first battery string and a second battery string arranged along a first direction. The second direction intersects with the first direction. Both the first battery string and the second battery string include a plurality of battery cells connected in series along the first direction. The battery string unit includes a first battery string unit, a second battery string unit, a third battery string unit, a fourth battery string unit, a fifth battery string unit, and a sixth battery string unit arranged at intervals along the second direction. A plurality of intermediate busbars are arranged at intervals along the second direction, the intermediate busbars including a first busbar, a second busbar, a third busbar, and a fourth busbar arranged at intervals along the second direction; the first busbar is used to connect the first battery string and the second battery string of the first battery string unit in parallel, the second busbar is used to connect the first battery string and the second battery string of the second battery string unit and the third battery string unit in parallel, the third busbar is used to connect the first battery string and the second battery string of the fourth battery string unit and the fifth battery string unit in parallel, and the fourth busbar is used to connect the first battery string and the second battery string of the sixth battery string unit in parallel; The first busbar and the fourth busbar are busbars according to any one of claims 1 to 10, and the second busbar and the third busbar are busbars according to any one of claims 11 to 17; the first lead portion of the first busbar is disposed close to the second lead portion of the second busbar, the first lead portion of the second busbar is disposed close to the second lead portion of the third busbar, and the first lead portion of the third busbar is disposed close to the first lead portion of the fourth busbar.

20. A photovoltaic system, characterized in that, Includes the solar cell module as described in claim 18 or 19.

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