Bus bar and photovoltaic module

Abstract

The utility model provides a bus bar and a photovoltaic module. The bus bar includes a conductive substrate and an insulating layer. The conductive substrate is provided with an electric contact surface, the electric contact surface is provided with an insulating isolation region and an electric contact region, and the insulating layer is arranged on the insulating isolation region; at least one of the insulation isolation area and the electric contact area is provided with a receding through groove used for containing a welding strip. The abdicating through groove is arranged on the insulating isolation area and / or the electric contact area, so that the stress of the contact part of the bus bar and the welding strip can be reduced, and the fracturing risk of the solar cell is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially, and it relates to a kind of bus bar and photovoltaic module. BACKGROUND

[0002] Photovoltaic module is the equipment commonly used in solar power generation system.Solar cell is the core component in photovoltaic module, for receiving sunlight and generating photo-generated carrier.Photovoltaic module usually includes multiple solar cells.In order to facilitate the photo-generated carrier in multiple solar cells to be led out to external circuit, photovoltaic module usually also includes bus bar for collecting current.

[0003] Back contact cell refers to the solar cell with both positive and negative electrodes arranged on the back surface.As the positive and negative electrodes of back contact cell are arranged on the same side surface, when arranging bus bar on back contact cell, it is also necessary to consider avoiding the problem of short circuit between positive and negative electrodes.Some conventional technologies propose to cover the partial area of solar cell with insulating material to avoid short circuit problem.In this way, the insulating material will shield part of the area of solar cell, thereby affecting the efficiency of the module.Meanwhile, the additional insulating material also increases the unevenness of the surface of solar cell, increasing the risk of cracking of solar cell during production process. SUMMARY

[0004] Therefore, it is necessary to provide a bus bar capable of reducing the risk of cracking of solar cell while ensuring the efficiency of the module in view of the problems in the above background technology.

[0005] According to some embodiments of the present disclosure, a bus bar is provided, which includes a conductive base and an insulating layer.

[0006] The conductive base has an electrical contact surface, which has an insulating isolation area and an electrical contact area, and the insulating layer is arranged on the insulating isolation area;wherein at least one of the insulating isolation area and the electrical contact area is provided with a giving-through slot for accommodating a solder strip.

[0007] In some embodiments of the present disclosure, the insulating isolation area and the electrical contact area are both multiple, and the insulating isolation area and the electrical contact area are alternately arranged along the extension direction of the conductive base.

[0008] In some embodiments of the present disclosure, the conductive base includes multiple fitting portions and multiple arch portions, the fitting portions and the arch portions are alternately arranged along the extension direction of the conductive base, and the part of the electrical contact surface located in the arch portion forms the giving-through slot.

[0009] In some embodiments of the present disclosure, the fitting portions are all located in the insulating isolation area of the conductive base, and the fitting portions are covered by the insulating layer.

[0010] In some embodiments of the present disclosure, the thickness of the insulating layer is 0.1 mm to 5 mm.

[0011] In some embodiments of the present disclosure, the clearance groove satisfies at least one of the following characteristics:

[0012] (1) The depth of the through groove along the extension direction perpendicular to the conductive substrate is 0.01 mm to 1 mm;

[0013] (2) The width of the through groove along the extension direction of the conductive substrate is 0.01 mm to 1 mm.

[0014] In some embodiments of the present disclosure, the conductive substrate includes a conductive metal layer and a welding metal layer that are stacked, and the surface of the welding metal layer away from the conductive metal layer forms the electrical contact surface.

[0015] In some embodiments of the present disclosure, the clearance groove satisfies one of the following characteristics:

[0016] (1) The clearance groove includes two obliquely intersecting side walls;

[0017] (2) The clearance groove includes two side walls and a flat bottom wall, wherein the bottom wall is located between the two side walls and intersects with the two side walls;

[0018] (3) The said clearance groove includes an arc-shaped groove wall.

[0019] Furthermore, the present disclosure also provides a photovoltaic assembly, which includes a solar cell sheet, a first welding ribbon, a second welding ribbon, and a plurality of bus bars as described in any of the above embodiments;

[0020] The first welding ribbon and the second welding ribbon are respectively welded to two electrodes with opposite polarities in the solar cell. Among the multiple bus bars, the electrical contact areas of some of the bus bars are electrically in contact with the first welding ribbon and their insulating isolation areas are arranged on the second welding ribbon, and the electrical contact areas of another part of the bus bars are electrically in contact with the second welding ribbon and their insulating isolation areas are arranged on the first welding ribbon.

[0021] In some embodiments of the present disclosure, there are multiple solar cell panels, and the multiple solar cell panels are arranged in parallel in sequence; each bus bar is independently arranged on one solar cell panel or spans two adjacent solar cell panels.

[0022] The busbar is provided with a conductive substrate and an insulating layer. The conductive substrate has an insulating isolation area covered by the insulating layer and an electrical contact area outside the insulating isolation area. When in use, the electrical contact area not covered by the insulating layer can directly contact the welding ribbon, thereby achieving conduction between the busbar and the welding ribbon. The insulating layer is used to prevent the conductive substrate from contacting the welding ribbon with opposite polarity, thereby playing a role in avoiding short circuits. The busbar is provided with an insulating layer on the conductive substrate, and the insulating layer is hidden under the conductive substrate, which can avoid the negative impact of the introduction of the insulating layer on the component efficiency and ensure the component efficiency. Furthermore, by providing a clearance groove on the insulating isolation area and / or the electrical contact area, the stress at the contact point between the busbar and the welding ribbon can be reduced, thereby reducing the risk of fracturing of the solar cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the cross-sectional structure of a busbar according to an embodiment;

[0024] Figure 2 is a schematic cross-sectional structural diagram of a busbar according to another embodiment;

[0025] Figure 3 is a schematic cross-sectional structural diagram of a busbar according to another embodiment;

[0026] Figure 4 Schematic diagram of a partial top view of a photovoltaic module according to an embodiment;

[0027] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of area A in FIG;

[0028] Figure 6 FIG. 1 is a schematic diagram of a partial top view of the photovoltaic assembly according to another embodiment.

[0029] The reference numerals and their meanings are as follows:

[0030] 100, busbar; 110, conductive substrate; 1101, insulating isolation region; 1102, electrical contact region; 111, laminating portion; 112, arched portion; 120, insulating layer; 130, through-hole;

[0031] 200, busbar; 210, conductive substrate; 2101, insulating isolation region; 2102, electrical contact region; 211, laminating portion; 212, arched portion; 220, insulating layer; 230, through groove;

[0032] 300, busbar; 310, conductive substrate; 3101, insulating isolation region; 3102, electrical contact region; 311, laminating portion; 312, arched portion; 320, insulating layer; 330, through-hole;

[0033] 400, solar cell; 410, first solder strip; 420, second solder strip. DETAILED DESCRIPTION

[0034] For the purpose of facilitating the understanding of the present application, the present application will be described more fully below in conjunction with the embodiments and effect drawings. The embodiments give the preferred embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0035] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly fixed to the other element or can be fixed to the other element through an intermediate element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intermediate element between the two elements. In addition, in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", and "connection" should be understood in a broad sense, for example, it can be fixed connection, or it can be detachable connection, or it can be integrated connection. For example, it can be mechanical connection, or it can be electrical connection. For example, it can be direct connection, or it can be indirect connection through an intermediate element, or it can be internal communication between two elements. It should be understood that those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances, and there will be no ambiguity.

[0036] Unless otherwise defined, in the description of the present application, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and other terms indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings of the present application, which is only for the purpose of facilitating and simplifying the description of the content of the present application, and to help the reader understand the drawings, and is not to limit or imply that the device or element referred to must have a specific orientation, therefore, it cannot be understood as a limitation of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the implementation of the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items. "Multiple" in this article includes the combination of two or more items.

[0038] The present disclosure provides a busbar comprising a conductive substrate and an insulating layer. The conductive substrate has an electrical contact surface, the electrical contact surface having an insulating isolation region and an electrical contact region, and the insulating layer is disposed in the insulating isolation region. A through-hole for accommodating a soldering ribbon is disposed in at least one of the insulating isolation region and the electrical contact region.

[0039] The busbar is provided with a conductive substrate and an insulating layer. The conductive substrate has an insulating isolation area covered by the insulating layer and an electrical contact area outside the insulating isolation area. When in use, the electrical contact area not covered by the insulating layer can directly contact the welding ribbon, thereby achieving conduction between the busbar and the welding ribbon. The insulating layer is used to prevent the conductive substrate from contacting the welding ribbon with opposite polarity, thereby playing a role in avoiding short circuits. The busbar is provided with an insulating layer on the conductive substrate, and the insulating layer is hidden under the conductive substrate, which can avoid the negative impact of the introduction of the insulating layer on the component efficiency and ensure the component efficiency. Furthermore, by providing a clearance groove on the insulating isolation area and / or the electrical contact area, the stress at the contact point between the busbar and the welding ribbon can be reduced, thereby reducing the risk of fracturing of the solar cell.

[0040] Figure 1 FIG. 1 is a schematic diagram of a cross-sectional structure of a bus bar 100 according to an embodiment of the present disclosure. Figure 1 As shown, the busbar 100 includes a conductive substrate 110 and an insulating layer 120. The conductive substrate 110 has an electrical contact surface, and the insulating layer 120 is disposed on the electrical contact surface. The conductive substrate 110 has an insulating isolation region 1101 covered by the insulating layer 120, and an electrical contact region 1102 located outside the insulating isolation region 1101. A through groove 130 for accommodating a soldering ribbon is disposed in at least one of the insulating isolation region 1101 and the electrical contact region 1102.

[0041] It can be understood that, in this embodiment, the area on the conductive substrate 110 covered by the insulating layer 120 is the insulating isolation area 1101 , and the area not covered by the insulating layer 120 is the electrical contact area 1102 .

[0042] Reference Figure 1 As shown in FIG. 1 , as an example of this embodiment, both the insulating isolation region 1101 and the electrical contact region 1102 are provided with a clearance groove 130. The clearance groove 130 in the insulating isolation region 1101 is an insulating clearance groove, and the clearance groove 130 in the electrical contact region 1102 is an electrical contact clearance groove.

[0043] As an example of this embodiment, there are multiple insulating isolation regions 1101 and multiple electrical contact regions 1102, and the insulating isolation regions 1101 and the electrical contact regions 1102 are alternately arranged along the extension direction of the conductive substrate 110. It can be understood that an insulating layer 120 is correspondingly provided on each insulating isolation region 1101. The back of some back-contact solar cells is usually provided with multiple positive polarity welding ribbons and negative polarity welding ribbons, and the positive polarity welding ribbons and the negative polarity welding ribbons are alternately arranged. The conductive substrate 110 provided with multiple electrical contact regions 1102 can be electrically connected to multiple positive polarity welding ribbons or multiple negative polarity welding ribbons at the same time, and is insulated and isolated from the welding ribbons of opposite polarity by the insulating layer 120 to avoid short circuits.

[0044] Reference Figure 1 As shown, as an example of this embodiment, the conductive substrate 110 includes a plurality of fitting portions 111 and a plurality of arched portions 112, the fitting portions 111 and the arched portions 112 are alternately arranged along the extension direction of the conductive substrate 110, and the portion of the electrical contact surface located within the arched portion 112 forms a clearance groove 130.

[0045] It can be understood that when the arched portion 112 is located in the insulating isolation area 1101, the clearance groove 130 surrounded by it serves as an insulating clearance groove; when the arched portion 112 is located in the electrical contact area 1102, the clearance groove 130 surrounded by it serves as an electrical contact clearance groove.

[0046] In actual use, the bonding portion 111 is used to bond with the surface of the solar cell between two adjacent welding strips to ensure that the bus bar 100 as a whole is tightly bonded to the solar cell.

[0047] Reference Figure 1 As shown, it can be understood that the thickness of the arched portion 112 and the thickness of the fitting portion 111 can be the same or substantially the same, thereby maintaining the overall thickness of the conductive substrate 110 to be relatively uniform.

[0048] It will be appreciated that one side of the arched portion 112 is convex and the other side is concave. In this embodiment, the side located on the electrical contact surface is concave, while the other side, which faces away from the electrical contact surface, is convex, thereby forming a clearance slot 130. This design, which arches a portion of the conductive substrate 110, helps ensure that the overall conductivity of the conductive substrate 110 is substantially unaffected. Compared to other designs, this design also offers a relatively low level of process complexity.

[0049] Reference Figure 1 As shown, as an example of this embodiment, the bonding portion 111 is disposed in the insulating isolation region 1101 of the conductive substrate 110 and is covered by the insulating layer 120. The design of the insulating layer 120 covering the bonding portion 111 helps ensure the flatness of the bonding portion 111 during use and reduces deformation of the conductive substrate 110.

[0050] Reference Figure 1 As shown, it can be understood that an arched portion 112 is provided on the insulating isolation region 1101 , and the arched portion 112 on the insulating isolation region 1101 and the two bonding portions 111 connected to both sides of the arched portion 112 are all covered by the insulating layer 120 .

[0051] Reference Figure 1 As shown, as an example of this embodiment, the entire electrical contact region 1102 is configured as the arched portion 112 , a portion of the insulating isolation region 1101 is configured as the arched portion 112 , and another portion of the region is configured as the fitting portion 111 .

[0052] Reference Figure 1 As shown, as an example of this embodiment, the conductive substrate 110 includes a conductive metal layer and a soldering metal layer that are stacked, and the soldering metal layer forms an electrical contact surface away from the surface of the conductive metal layer.

[0053] The conductive metal layer has better conductivity than the welding metal layer, and the welding metal layer may have a lower melting point so as to be easily welded to the surface of the welding strip during use.

[0054] In some examples, the conductive metal layer may be a copper metal layer or a copper alloy layer.

[0055] In some examples, the solder metal layer may be a tin metal layer or a tin alloy layer.

[0056] As an example of this embodiment, the insulating layer 120 is disposed on the electrical contact region 1102 by coating or adhering.

[0057] As an example of this embodiment, the insulating layer 120 may be an insulating adhesive layer or an insulating film. The insulating film may be, but is not limited to, a polymer film. The insulating adhesive layer may be, but is not limited to, a polymer adhesive layer.

[0058] In some examples, the polymer film may be a polyethylene terephthalate film or a polyimide film.

[0059] In some examples, the polymer adhesive layer may be an ethylene vinyl acetate copolymer-containing adhesive layer.

[0060] Reference Figure 1 As shown, as an example of this embodiment, the thickness of the insulating layer 120 is 0.1 mm to 5 mm.

[0061] In some examples, the thickness of the insulating layer 120 can be 0.1 mm, 0.2 mm, 0.5 mm, 0.7 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, or 5 mm, or the thickness of the insulating layer 120 can be between any two of the aforementioned thicknesses. Insulating layer 120 of such thickness helps ensure relatively stable insulation performance and also reduces the problem of increased strain on the solar cell caused by the introduction of the insulating layer 120.

[0062] Reference Figure 1 As shown, the clearance groove 130 has a groove depth h along the extending direction perpendicular to the conductive substrate 110. As an example of this embodiment, the groove depth h of the clearance groove 130 is 0.01 mm to 1 mm.

[0063] In some examples, the depth h of the through-hole 130 is 0.01 mm, 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, or 1 mm, or the depth of the through-hole 130 can be between any two of the above depths. A depth h of 0.01 mm to 1 mm for the through-hole 130 is more consistent with the height of the solder ribbon, effectively reducing stress while ensuring good electrical contact between the electrical contact area 1102 and the solder ribbon.

[0064] Reference Figure 1 As shown, the clearance groove 130 has a groove width d along the extension direction of the conductive substrate 110. As an example of this embodiment, the groove width d of the clearance groove 130 is 0.01 mm to 1 mm.

[0065] In some examples, the width d of the clearance groove 130 is 0.01 mm, 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, or 1 mm, or the width d of the clearance groove 130 can be between any two of the aforementioned widths. A width d of 0.01 mm to 1 mm is more suitable for the width dimension, which helps to accommodate the entire solder ribbon in the clearance groove 130 in the width direction, thereby preventing excessive compression and deformation between the solder ribbon and the bonding portion 111 of the conductive substrate 110.

[0066] It can be understood that, in the case where there are multiple through-holes 130 , the depths and widths of the through-holes 130 can be the same or different.

[0067] Reference Figure 1 As shown, as an example of this embodiment, the clearance groove 130 includes two obliquely intersecting side walls. It can be understood that the cross-sections of the two side walls of the clearance groove 130 form a structure approximately in a "V" shape.

[0068] Figure 2 FIG. 2 is a schematic cross-sectional view of a bus bar 200 according to another embodiment of the present disclosure. Figure 2 As shown, the busbar 200 includes a conductive substrate 210 and an insulating layer 220. The conductive substrate 210 has an electrical contact surface, and the insulating layer 220 is disposed on the electrical contact surface. The conductive substrate 210 has an insulating isolation region 2101 covered by the insulating layer 220, and an electrical contact region 2102 located outside the insulating isolation region 2101. A through groove 230 for accommodating a soldering ribbon is disposed in at least one of the insulating isolation region 2101 and the electrical contact region 2102.

[0069] Reference Figure 2 As shown, as an example of this embodiment, the conductive substrate 210 includes a plurality of fitting portions 211 and a plurality of arched portions 212. The fitting portions 211 and the arched portions 212 are alternately arranged along the extension direction of the conductive substrate 210. The surface of the arched portion 212 located on the electrical contact surface forms a clearance groove 230.

[0070] Reference Figure 2 As shown, as an example of this embodiment, the clearance groove 230 includes two side walls and a flat bottom wall, the bottom wall is located between the two side walls and intersects with the two side walls. In this embodiment, the cross section of the clearance groove 230 is a trapezoidal structure.

[0071] I understand. Figure 2 The bus bar 200 shown is connected to Figure 1 The main difference of the busbar 100 shown is the shape of the relief slot 230 and the arched portion 212 . Figure 2 For other structures of the bus bar 200, please refer to Figure 1 The bus bar 100 shown is configured accordingly and will not be described in detail here.

[0072] Figure 3 FIG. 3 is a schematic cross-sectional view of a bus bar 300 according to another embodiment of the present disclosure. Figure 3 As shown, the busbar 300 includes a conductive substrate 310 and an insulating layer 320. The conductive substrate 310 has an electrical contact surface, and the insulating layer 320 is disposed on the electrical contact surface. The conductive substrate 310 has an insulating isolation region 3101 covered by the insulating layer 320, and an electrical contact region 3102 located outside the insulating isolation region 3101. A through groove 330 for accommodating a soldering ribbon is disposed in at least one of the insulating isolation region 3101 and the electrical contact region 3102.

[0073] Reference Figure 3As shown, as an example of this embodiment, the conductive base 310 includes a plurality of adhesion portions 311 and a plurality of arch portions 312, the adhesion portions 311 and the arch portions 312 are arranged alternately along the extension direction of the conductive base 310, and the surface of the arch portions 312 on the electrical contact surface encloses the clearance groove 330.

[0074] Referring to Figure 3 As shown, as an example of this embodiment, the clearance groove 330 includes a groove wall in an arc shape.

[0075] It can be understood that Figure 3 The bus bar 300 shown is mainly different from the bus bar 100 shown in Figure 1 in the shape of the clearance groove 330 and the arch portions 312. Figure 3 The other structures of the bus bar 300 shown can be arranged correspondingly with reference to the bus bar 100 shown in Figure 1 and will not be described here.

[0076] Further, the present disclosure also provides a photovoltaic module. Figure 4 A partial top view structural schematic diagram of a photovoltaic module according to an embodiment of the present disclosure. Referring to Figure 4 As shown, the photovoltaic module includes a solar cell 400, a first solder strip 410, a second solder strip 420, and a bus bar 100 as shown in Figure 1 .

[0077] Referring to Figure 4 As shown, in this embodiment, the first solder strip 410 and the second solder strip 420 are respectively soldered to two kinds of electrodes with opposite polarities in the solar cell 400. For example, the first solder strip 410 is soldered to the positive electrode of the solar cell 400, and the second solder strip 420 is soldered to the negative electrode of the solar cell 400. Figure 5 A partial top view structural schematic diagram of a photovoltaic module according to another embodiment of the present disclosure. Referring to Figure 4 , an enlarged structural schematic diagram of area A in FIG. 10B. Combined with Figure 4 and Figure 5 As shown, as an example of this embodiment, the bus bar 100 has a plurality of bus bars, wherein the electrical contact area 1102 of part of the bus bars 100 is electrically contacted to the first solder strip 410 and the insulating isolation area 1101 thereof is arranged on the second solder strip 420, and the electrical contact area 1102 of another part of the bus bars 100 is electrically contacted to the second solder strip 420 and the insulating isolation area 1101 thereof is arranged on the first solder strip 410.

[0078] It can be understood that the electrical contact area 1102 of the bus bar 100 can be electrically contacted to the first solder strip 410 by soldering. The insulating isolation area 1101 of the bus bar is insulated and spaced from the second solder strip 420 by an insulating layer 120.

[0079] Further, combined with Figure 4 and Figure 5 As shown, as an example of this embodiment, the first solder strips 410 and the second solder strips 420 are both multiple, and the multiple first solder strips 410 and the multiple second solder strips 420 are arranged alternately and spaced. The extension direction of the bus bar 100 can intersect with the extension direction of the first solder strip 410 and the extension direction of the second solder strip 420.

[0080] Further, referring to Figure 4 As shown, as an example of this embodiment, the solar cell pieces 400 are multiple, and the multiple solar cell pieces 400 are arranged in sequence and side by side. Further, the two adjacent solar cell pieces 400 can be abutted, or the two adjacent solar cell pieces 400 can be partially overlapped, or the two adjacent solar cell pieces can have a gap therebetween.

[0081] Further, in this example, each bus bar 100 is independently arranged on one solar cell piece 400, or across the two adjacent solar cell pieces 400. Further, for the case that the bus bar 100 is arranged on one solar cell piece 400, the bus bar 100 can be arranged close to the edge of the solar cell piece 400, or can be arranged on the middle region of the solar cell piece 400.

[0082] For example Figure 4 As shown, one of the bus bars 100 is arranged close to the outer edge of the outermost solar cell piece 400. The other bus bar 100 is arranged across the two adjacent solar cell pieces 400.

[0083] Figure 6 A partial top view schematic diagram of a photovoltaic module of another embodiment. Figure 6 The photovoltaic module of Figure 4 The main difference between the photovoltaic module of Figure 6 As shown, one of the bus bars 100 is arranged on the middle region of the outermost solar cell piece 400, and the other bus bar 100 is arranged across the two adjacent solar cell pieces 400.

[0084] The technical features of the above embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combination of the technical features does not cause contradiction, it shall be considered within the scope of the present disclosure.

[0085] The above embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, and these variations and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A busbar (100), characterized in that: The busbar (100) comprises a conductive substrate (110) and an insulating layer (120); The conductive substrate (110) has an electrical contact surface, the electrical contact surface has an insulating isolation region (1101) and an electrical contact region (1102), and the insulating layer (120) is arranged in the insulating isolation region (1101); wherein, a clearance groove (130) for accommodating a welding strip is provided on at least one of the insulating isolation region (1101) and the electrical contact region (1102).

2. The busbar (100) according to claim 1, characterized in that There are a plurality of both the insulating isolation regions (1101) and the electrical contact regions (1102), and the insulating isolation regions (1101) and the electrical contact regions (1102) are alternately arranged along the extension direction of the conductive substrate (110).

3. The busbar (100) according to claim 2, characterized in that The conductive substrate (110) comprises a plurality of fitting portions (111) and a plurality of arched portions (112), wherein the fitting portions (111) and the arched portions (112) are alternately arranged along the extension direction of the conductive substrate (110), and the portion of the electrical contact surface located within the arched portions (112) forms the clearance groove (130).

4. The busbar (100) according to claim 3, characterized in that The bonding portions (111) are all located in the insulating isolation region (1101) of the conductive substrate (110), and the bonding portions (111) are covered by the insulating layer (120).

5. The busbar (100) according to any one of claims 1 to 4, characterized in that: The thickness of the insulating layer (120) is 0.1 mm to 5 mm.

6. The busbar (100) according to any one of claims 1 to 4, characterized in that: The clearance groove (130) satisfies at least one of the following characteristics: (1) The groove depth of the clearance groove (130) along the extension direction perpendicular to the conductive substrate (110) is 0.01 mm to 1 mm; (2) The width of the notch of the clearance groove (130) along the extension direction of the conductive substrate (110) is 0.01 mm to 1 mm.

7. The busbar (100) according to any one of claims 1 to 4, characterized in that: The conductive substrate (110) comprises a conductive metal layer and a welding metal layer which are stacked, and a surface of the welding metal layer away from the conductive metal layer forms the electrical contact surface.

8. The busbar (100) according to any one of claims 1 to 4, characterized in that: The clearance groove (130) satisfies one of the following characteristics: (1) The clearance groove (130) includes two obliquely intersecting side walls; (2) The clearance groove (130) includes two side walls and a flat bottom wall, wherein the bottom wall is located between the two side walls and intersects with the two side walls; (3) The clearance groove (130) includes an arc-shaped groove wall.

9. A photovoltaic module, characterized in that: Comprising a solar cell sheet (400), a first welding strip (410), a second welding strip (420), and a plurality of bus bars (100) according to any one of claims 1 to 8; The first welding strip (410) and the second welding strip (420) are respectively welded to two electrodes with opposite polarities in the solar cell sheet (400); among the plurality of bus bars (100), the electrical contact areas (1102) of some of the bus bars (100) are in electrical contact with the first welding strip (410) and their insulating isolation areas (1101) are arranged on the second welding strip (420); and the electrical contact areas (1102) of another part of the bus bars (100) are in electrical contact with the second welding strip (420) and their insulating isolation areas (1101) are arranged on the first welding strip (410).

10. The photovoltaic module according to claim 9, characterized in that: There are a plurality of solar cell sheets (400), and the plurality of solar cell sheets (400) are arranged in parallel in sequence; Each bus bar (100) is independently arranged on one solar cell sheet (400) or straddles two adjacent solar cell sheets (400).

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