Solder strip and photovoltaic module

Abstract

The utility model relates to the field of solar photovoltaic cells, and provides a solder strip and a photovoltaic module, the solder strip comprises a plurality of extension parts and a plurality of contact parts, the plurality of extension parts are distributed at intervals along the extension direction of the solder strip, and the plurality of contact parts are connected between every two adjacent extension parts in a one-to-one correspondence manner. Each contact part is provided with at least one contact surface used for being in contact with a battery piece, the contact surfaces of the multiple contact parts face the same direction, a containing hole is formed in at least one contact surface of each contact part, the containing hole is filled with a bonding body, and the bonding bodies are used for connecting the welding strip with the battery piece attached to the contact surfaces in an adhesive mode. According to the solder strip and the photovoltaic module provided by the invention, the contact part of the solder strip is provided with the contact surface used for being in contact with the battery piece, so that when the solder strip and the battery piece are welded and connected, the welding area between the solder strip and the battery piece can be ensured through the contact surface, and the bonding body can be in adhesion connection with the surface of the battery piece; the bonding strength of the solder strip and the battery piece is improved, and the stability and the product yield of the photovoltaic module are ensured.

Description

Technical Field

[0001] The utility model relates to the field of solar photovoltaic cells, in particular to a welding strip and a photovoltaic component. Background Art

[0002] With the development of modern industry, the global energy crisis and air pollution problems are becoming increasingly prominent. Traditional fuel energy is decreasing day by day, and the harm to the environment is becoming increasingly prominent. The world has turned its attention to renewable energy, hoping that renewable energy can change the energy structure of mankind and maintain long-term sustainable development. The abundant solar radiation energy is an important renewable energy source, which is inexhaustible, pollution-free, cheap, and freely available to humans. Therefore, photovoltaic modules (solar cells) have become the focus of attention by taking advantage of their ability to convert solar radiation energy into electrical energy.

[0003] In conventional photovoltaic modules, the surface of the cell is usually distributed with intersecting main grid lines and auxiliary grid lines. Carriers are collected through the current path of cell → main grid line → auxiliary grid line. In order to fix the main grid line and auxiliary grid line on the cell, it is often necessary to make silver pads (i.e. PAD points) on the surface of the cell using silver paste, resulting in high production costs of photovoltaic modules.

[0004] In order to reduce the amount of silver paste used, the industry has proposed 0BB technology (busbar-free technology), which means eliminating the busbar and PAD points of the cell, retaining only the sub-grid structure, and using welding strips to conduct current in the component link. Since the surface of heterojunction cells (HJT) is passivated with a conductive film layer (TCO), the welding strip can be electrically connected to the conductive film layer. Therefore, the development of 0BB technology is particularly important in the field of heterojunction cells.

[0005] In existing busbar-free heterojunction solar cells, the problem of insufficient bonding strength between the soldering ribbon and the cell often occurs when the soldering ribbon is connected to the cell, resulting in poor product stability. Therefore, how to provide a soldering ribbon structure that can stably contact the cell to ensure the reliability of photovoltaic module products has become a technical problem that needs to be solved in this field. Utility Model Content

[0006] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model provides a welding strip and a photovoltaic module, wherein the welding strip has a high bonding strength with the battery cell, and can ensure the stability and product yield of the photovoltaic module.

[0007] To achieve the above object, as one aspect of the utility model, a welding strip is provided, the welding strip comprising a plurality of extension portions and a plurality of contact portions, the plurality of extension portions are spaced apart along the extension direction of the welding strip, the plurality of contact portions are connected between each two adjacent extension portions in a one-to-one correspondence, the contact portion has at least one contact surface for contacting a battery cell, and the contact surfaces of the plurality of contact portions are oriented in the same direction;

[0008] At least one of the contact portions is provided with a receiving hole, and the receiving hole is filled with an adhesive, and the adhesive is used to adhere and connect the soldering strip to the battery cell attached to the contact surface.

[0009] Optionally, the contact surface is flush with the surface on the corresponding side of the extension portion.

[0010] Optionally, the accommodating hole passes through the contact portion along the center axis direction thereof.

[0011] Optionally, the material of the bonding body includes ultraviolet light curing adhesive.

[0012] Optionally, the bonding body includes a thermoplastic resin material and a plurality of conductive particles, and the thermoplastic resin material is bonded between the plurality of conductive particles.

[0013] Optionally, the material of the thermoplastic resin material includes at least one of polypropylene (PP), POE plastic (Polyaltha Olfin), polyethylene (PE), thermoplastic polyolefin (TPO), polyurethane (PU), polymethyl methacrylate (PMMA), and acrylic copolymer.

[0014] Optionally, the conductive particles have a particle size of 1 μm-20 μm.

[0015] Optionally, the material of the conductive particles includes at least one of silver, copper, nickel and tin.

[0016] Optionally, the contact portion is cylindrical in shape, and two end cylindrical surfaces of the contact portion form a pair of contact surfaces.

[0017] Optionally, the diameter of the contact surface is 0.1 mm-0.3 mm.

[0018] Optionally, the cross-sectional shape of the extension portion is triangular, circular, trapezoidal, rhombus or semicircular.

[0019] Optionally, the cross-sectional shape of the extension portion is circular, and the cross-sectional diameter of the extension portion is 0.1 mm-0.3 mm.

[0020] Optionally, the plurality of contact portions are distributed at equal intervals along an extension direction of the welding strip.

[0021] Optionally, surfaces of the extension portion and the contact portion are both coated with a thermoplastic conductive layer, the thermoplastic conductive layer comprises a thermoplastic resin material and a plurality of conductive particles, and the thermoplastic resin material is bonded between the plurality of conductive particles.

[0022] Optionally, the welding strip body includes a substrate and an anti-oxidation layer coated on a surface of the substrate, and the substrate extends along an extension direction of the welding strip.

[0023] Optionally, the material of the anti-oxidation layer includes at least one of silver, tin, and nickel.

[0024] As a second aspect of the utility model, a photovoltaic module is provided, which includes a plurality of battery cells and a plurality of welding strips, wherein the plurality of battery cells are distributed in an array, the welding strips are connected between adjacent battery cells, the welding strips are the welding strips described above, and the welding strips are adhered and connected to the corresponding battery cells through an adhesive.

[0025] Optionally, the welding strips are welded to different sides of adjacent battery cells.

[0026] Optionally, the battery cell includes a first transparent conductive layer, a power generation layer and a second transparent conductive layer stacked in sequence along the thickness direction, and the welding strip is welded and connected to the first transparent conductive layer of one of the two adjacent battery cells, and is welded and connected to the second transparent conductive layer of the other of the two adjacent battery cells.

[0027] Optionally, a material of the first transparent conductive layer includes indium tin oxide (ITO) or aluminum zinc oxide (AZO).

[0028] Optionally, the material of the second transparent conductive layer includes indium tin oxide or zinc aluminum oxide.

[0029] Optionally, the battery cell has a thickness of 50 μm-120 μm.

[0030] Optionally, the battery cell has a thickness of 50 μm, 60 μm, 80 μm, 100 μm or 120 μm.

[0031] In the welding strip and photovoltaic module provided by the utility model, the welding strip includes a plurality of extensions and a plurality of contact parts, and the contact part has a contact surface for contacting with the battery cell, so that when the welding strip is welded to the battery cell, the contact surface of the contact part can effectively ensure the area of ​​the welding strip and the battery cell to be attached and connected, thereby improving the bonding strength between the welding strip and the battery cell, avoiding the welding strip from being separated from the battery cell when the battery cell is displaced or bent, etc., thereby ensuring the stability and product yield of the photovoltaic module. In addition, a receiving hole is formed on the contact surface of the contact part, and an adhesive is filled in the receiving hole, so that after the contact surface of the contact part contacts the surface of the battery cell, the adhesive can be adhered and connected to the surface of the battery cell, further improving the bonding strength between the welding strip and the battery cell, and ensuring the stability and product yield of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The utility model is further described below in conjunction with the accompanying drawings:

[0033] Figure 1 It is a schematic diagram of the structure of the welding strip provided by the embodiment of the utility model;

[0034] Figure 2 It is a structural schematic diagram of a welding strip body in a welding strip provided by an embodiment of the utility model;

[0035] Figure 3 It is a schematic diagram of the structure of the welding strip provided by the embodiment of the utility model;

[0036] Figure 4 It is a schematic diagram of the structure of the welding strip provided by the embodiment of the utility model;

[0037] Figure 5 It is a schematic diagram of the structure of the welding strip provided by the embodiment of the utility model;

[0038] Figure 6 It is a schematic diagram of the internal structure of the thermoplastic conductive layer in the welding strip provided by the embodiment of the utility model;

[0039] Figure 7 This is a schematic diagram of the connection relationship between the welding strip and the battery cell provided in the embodiment of the utility model;

[0040] Figure 8 It is a partial structural schematic diagram of a photovoltaic assembly provided by an embodiment of the utility model;

[0041] Fig. 9 yes Figure 8 A partial enlarged schematic diagram of area A in the middle.

[0042] Description of Reference Numerals

[0043] Welding strip 10;

[0044] The solder strip body 100 ; the substrate 110 ; the anti-oxidation layer 120 ; the extension portion 101 ; the contact portion 102 ; the bonding body 103 ; the receiving hole 104 ;

[0045] Thermoplastic conductive layer 200; thermoplastic resin material 210; conductive particles 220;

[0046] Battery cell 20 ; first transparent conductive layer 21 ; power generation layer 22 ; second transparent conductive layer 23 . DETAILED DESCRIPTION

[0047] The following is a detailed description of embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments in the implementation manner are intended to be used to explain the present invention and should not be construed as limiting the present invention.

[0048] References to "one embodiment" or "an example" or "an example" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment disclosed in the present utility model. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0049] In order to solve the above technical problems, as one aspect of the utility model, a welding strip 10 is provided, such as Figures 1 to 5 As shown, the soldering ribbon 10 includes a soldering ribbon body 100. Figure 1 , Figure 2 As shown, the solder strip body 100 includes a plurality of extension portions 101 and a plurality of contact portions 102. The plurality of extension portions 101 are spaced apart along the extension direction of the solder strip 10. The plurality of contact portions 102 are connected one by one between each two adjacent extension portions 101. The contact portion 102 has at least one contact surface for contacting with a battery cell. The contact surfaces of the plurality of contact portions 102 face the same direction. At least one contact portion 102 is provided with a receiving hole 104. The receiving hole 104 is filled with an adhesive 103. The adhesive 103 is used to adhere and connect the solder strip 10 to the battery cell with the contact surface attached.

[0050] The soldering strip 10 provided by the utility model includes a plurality of extension portions 101 and a plurality of contact portions 102, and the contact portion 102 has a contact surface for contacting with the battery cell, so that when the soldering strip 10 is welded to the battery cell, the contact surface of the contact portion 102 can effectively ensure the area of ​​the soldering strip 10 and the battery cell to be attached and connected, thereby improving the bonding strength between the soldering strip 10 and the battery cell. In addition, a receiving hole 104 is formed on the contact surface of the contact portion 102, and an adhesive 103 is filled in the receiving hole 104, so that after the contact surface of the contact portion 102 contacts the surface of the battery cell, the adhesive 103 can be attached and connected to the surface of the battery cell, further improving the bonding strength between the soldering strip 10 and the battery cell, and ensuring the stability of the photovoltaic module and the product yield.

[0051] In order to further ensure the welding strength between the welding strip and the battery cell, as a preferred embodiment of the utility model, Figure 2 As shown, the contact surface of the contact portion 102 is flush with the surface of the corresponding side of the extension portion 101 .

[0052] In the embodiment of the utility model, the contact surface of the contact portion 102 is flush with the surface of the corresponding side of the extension portion 101, so that not only the contact surface of the contact portion 102 can form a welding relationship with the battery cell, but the extension portion 101 connected between the contact portions 102 can also be welded to the battery cell, so that the welding strip is in contact with the battery cell in its entire extension direction, further ensuring the welding strength between the welding strip and the battery cell.

[0053] In the related art, the connection between the soldering ribbon and the battery cell can be achieved through welding and non-welding methods. In the process of connecting the soldering ribbon and the battery cell by welding, it is necessary to use silver paste to coat the surface of the battery cell to make a soldering pad, and then align the soldering ribbon and the soldering pad for welding. Therefore, a large amount of silver paste needs to be consumed at the welding part, which increases the production cost of the photovoltaic module. In the non-welding method, when the soldering ribbon is bonded by dispensing glue or the like, the bonding force of the glue is insufficient, and it often detaches from the surface of the battery cell when the battery cell moves or deforms, seriously affecting the stability of the photovoltaic module product.

[0054] In order to solve this technical problem, as a preferred implementation of the utility model, as Figure 3 , Figure 4 , Figure 5 As shown, the surfaces of the extension portion 101 and the contact portion 102 are both coated with a thermoplastic conductive layer 200. Figure 6 As shown, the thermoplastic conductive layer 200 includes a thermoplastic resin material 210 and a plurality of conductive particles 220 , and the thermoplastic resin material 210 is bonded between the plurality of conductive particles 220 .

[0055] In the embodiment of the utility model, the surface of the soldering strip 10 is coated with a thermoplastic conductive layer 200, and the thermoplastic conductive layer 200 includes conductive particles 220 bonded together by a thermoplastic resin material 210, wherein the conductive particles 220 are conductive, and can make the thermoplastic conductive layer 200 have good conductivity. The thermoplastic resin material 210 can be plastically deformed under heating, so that the thermoplastic conductive layer 200 is fully in contact with and bonded to the battery cell to which the soldering strip is attached, thereby ensuring stable contact between the soldering strip and the battery cell and improving the contact yield.

[0056] Furthermore, the soldering tape provided in the embodiment of the utility model can be directly connected to the battery cell by welding, without the need to pre-coat the surface of the battery cell with silver paste to make a soldering pad, which can effectively reduce the production cost of the photovoltaic module. In addition, the temperature at which the thermoplastic resin material is heated to melt is significantly lower than the melting point of the traditional soldering tape, so the heating temperature when the soldering tape provided in the embodiment of the utility model is welded to the surface of the battery cell can be lower, and the thickness of each film layer of the battery cell can be further reduced, which is conducive to achieving lightweight components and can further reduce the material and process costs of making each functional film layer of the battery cell.

[0057] As an optional embodiment of the present invention, the thermoplastic conductive layer 200 is in a molten state (i.e., in a flowing state) when the temperature is higher than the preset welding temperature. At this time, the conductive particles 220 inside the thermoplastic conductive layer 200 can move to contact the surface of the battery cell to achieve a conductive connection. The above preset temperature can be determined according to the specific material composition of the adhesive material 210 in the thermoplastic conductive layer 200, and the embodiment of the present disclosure does not limit this. For example, the preset welding temperature can be 50°C to 200°C.

[0058] Optionally, the preset temperature may be 50°C, 80°C, 120°C, 150°C, 180°C, or 200°C.

[0059] It should be understood that in the related art, when the welding ribbon and the battery cell are connected by welding, the temperature of high temperature welding is usually 220°C-250°C, and the temperature of low temperature welding is usually 180°C-220°C. Therefore, compared with the related art, the welding temperature when the welding ribbon 10 and the battery cell are connected by the thermoplastic conductive layer 200 in the present disclosure is lower, and thus, it can be adapted to the battery cell with a smaller thickness under the premise of avoiding the battery from being broken due to thermal stress, and realize the lightness and thinness of the photovoltaic module while ensuring the product yield.

[0060] As an optional embodiment of the present invention, the material of the thermoplastic resin material 210 includes at least one of polypropylene (PP), POE plastic (Polyaltha Olfin), polyethylene (PE), thermoplastic polyolefin (TPO), polyurethane (PU), polymethyl methacrylate (PMMA), and acrylic copolymer.

[0061] As an optional implementation of the present invention, the particle size of the conductive particles 220 is 1 μm-20 μm.

[0062] As an optional implementation of the present invention, the material of the conductive particles 220 includes at least one of silver (Ag), copper (Cu), nickel (Ni), and tin (Sn).

[0063] In some embodiments of the present invention, Figure 2 As shown, the receiving hole 104 can be a blind hole structure formed on the contact surface. Alternatively, in order to improve the efficiency of filling the adhesive 103 into the receiving hole and reduce the difficulty of making the solder strip 10, as a preferred embodiment of the utility model, Figure 5 As shown, the receiving hole 104 may also be a through hole, that is, passing through the contact portion 102 along the center axis direction thereof.

[0064] As an optional implementation of the present invention, the bonding body 103 includes a thermoplastic resin material and a plurality of conductive particles, and the thermoplastic resin material is bonded between the plurality of conductive particles.

[0065] In the embodiment of the utility model, the adhesive 103 is made of the same material as the thermoplastic conductive layer 200. When the soldering ribbon 10 is welded to the battery cell, the thermoplastic resin material of the adhesive 103 is also heated to a molten state, so that the conductive particles are in contact with the surface of the battery cell, thereby further fixing the soldering ribbon 10 with the thermoplastic resin material, ensuring the welding strength, and further ensuring the electrical contact area between the soldering ribbon 10 and the surface of the battery cell, thereby improving the conductive performance of the soldering ribbon 10.

[0066] As an optional implementation of the present invention, the material of the thermoplastic resin material includes at least one of polypropylene, POE plastic, polyethylene, thermoplastic polyolefin, and polyurethane.

[0067] As an optional implementation of the present invention, the molecular weight of the polymer in the thermoplastic resin material is 10,000-200,000.

[0068] As an optional implementation of the present invention, the particle size of the conductive particles is 1 μm-20 μm.

[0069] As an optional implementation of the present invention, the material of the conductive particles includes at least one of silver, copper, nickel, and tin.

[0070] As another optional implementation of the present invention, when the receiving hole 104 is a through hole, the material of the adhesive 103 includes ultraviolet light curing glue (UV glue).

[0071] When welding the welding ribbon 10 to the battery cell, ultraviolet light can be simultaneously used to irradiate the welding ribbon 10 to solidify the adhesive 103 in the receiving hole 104 of the welding ribbon 10, further fix the welding ribbon 10, and ensure the welding strength of the welding ribbon 10.

[0072] As an optional implementation of the present utility model, Figure 2 As shown, the contact portion 102 is cylindrical in shape, and both end cylindrical surfaces of the contact portion 102 form a pair of contact surfaces.

[0073] As an optional implementation of the present invention, the diameter of the contact surface is 0.1 mm-0.3 mm.

[0074] In other embodiments of the present invention, the shape of the contact portion 102 may also be a rectangular parallelepiped, a pyramid or other structures.

[0075] As an optional implementation of the present invention, the cross-sectional shape of the extension portion 101 is triangular, circular, trapezoidal, rhombus or semicircular.

[0076] For example, Figure 3 to Figure 4 , Figure 6 The cross section of the extension portion 101 is shown as a circular shape. Figure 5 The illustrated case is that the cross section of the extension portion 101 is a trapezoid.

[0077] As an optional implementation of the present invention, the cross-sectional shape of the extension portion 101 is circular, and the cross-sectional diameter of the extension portion 101 is 0.1 mm-0.3 mm.

[0078] In order to improve the uniformity of the stress generated inside the soldering strip 10 along the extending direction of the soldering strip 10, as a preferred embodiment of the present invention, Figures 3 to 5 As shown, the plurality of contact portions 102 are distributed at equal intervals along the extending direction of the soldering ribbon 10 .

[0079] In order to improve the corrosion resistance of the welding strip, as a preferred embodiment of the present invention, Figures 3 to 5As shown, the solder strip body 100 includes a substrate 110 and an anti-oxidation layer 120 coated on the surface of the substrate 110 , and the substrate 110 extends along the extension direction of the solder strip 10 .

[0080] In an embodiment of the utility model, the welding strip body 100 includes a substrate 110 and an anti-oxidation layer 120 coated on the surface of the substrate 110, so that the substrate 110 can be protected by the anti-oxidation layer 120 to prevent the substrate 110 from being oxidized and corroded by the external water and oxygen environment, thereby improving the corrosion resistance of the welding strip and ensuring the service life of the photovoltaic module.

[0081] As an optional implementation of the present invention, the material of the substrate 110 may include copper (Cu).

[0082] As an optional embodiment of the present invention, the material of the substrate 110 can also be copper-aluminum alloy, copper-silver alloy, copper-silver-aluminum alloy, tin-silver-copper alloy, tin-lead alloy, tin-bismuth-silver-copper alloy, tin-lead-bismuth alloy, tin-bismuth-silver alloy or tin-bismuth-indium-silver alloy.

[0083] As an optional implementation of the present invention, the material of the anti-oxidation layer 120 includes at least one of silver, tin, and nickel.

[0084] As a second aspect of the present invention, a photovoltaic module is provided, such as Figures 8 to 9 As shown, the photovoltaic module includes multiple battery cells 20 and multiple welding strips 10. The multiple battery cells 20 are distributed in an array. The welding strips 10 are connected between adjacent battery cells 20. The welding strips 10 are the front welding strips 10. The welding strips 10 are adhered and connected to the battery cells 20 through an adhesive 103.

[0085] In the photovoltaic module provided by the present invention, the welding strip 10 includes a plurality of extension portions 101 and a plurality of contact portions 102, and the contact portion 102 has a contact surface for contacting the battery cell 20, so that the welding area between the welding strip 10 and the battery cell 20 can be effectively guaranteed through the contact surface of the contact portion 102, thereby improving the bonding strength between the welding strip 10 and the battery cell 20, and preventing the welding strip 10 from being detached from the battery cell 20 when the battery cell 20 is displaced or bent, thereby ensuring the stability of the photovoltaic module and the product yield.

[0086] In addition, a receiving hole 104 is formed on the contact surface of the contact portion 102, and the receiving hole 104 is filled with an adhesive 103, so that after the contact surface of the contact portion 102 contacts the surface of the battery cell, the adhesive 103 can adhere to and connect with the surface of the battery cell, further improving the bonding strength between the welding strip 10 and the battery cell, and ensuring the stability of the photovoltaic module and the product yield.

[0087] As an optional implementation of the present utility model, Figure 8As shown, the welding ribbon 10 is welded to different sides of adjacent battery cells 20 .

[0088] In the embodiment of the utility model, the orientation of the battery cells 20 in the battery cell array is kept consistent, and the welding strips 10 need to connect different side surfaces of adjacent battery cells 20 to connect the adjacent battery cells 20 in series. Fig. 9 As shown, the left part of the welding strip 10 located on the left side (not shown in the figure) is connected to the front side of the left battery cell (not shown in the figure), and the right part is connected to the back side of the current battery cell 20; the left part of the welding strip 10 located on the right side is connected to the front side of the current battery cell 20, and the right part (not shown in the figure) is connected to the back side of the right battery cell (not shown in the figure), thereby connecting the current battery cell 20 in series with the battery cells on the left and right sides.

[0089] As an optional implementation of the present utility model, Figure 7 As shown, the battery cell 20 includes a first transparent conductive layer 21, a power generation layer 22, and a second transparent conductive layer 23 which are stacked in sequence along the thickness direction. The welding strip 10 is welded and connected to the first transparent conductive layer 21 of one of the two adjacent battery cells 20, and is welded and connected to the second transparent conductive layer 23 of the other of the two adjacent battery cells 20.

[0090] It can be understood that the power generation layer 22 may include a conventional stacked battery power generation structure, for example, it may include a stacked electron transport layer, a light absorbing layer and a hole transport layer, the light absorbing layer is used to absorb the energy of sunlight and generate carrier pairs, the electrons in the carrier pairs are transmitted to one side of the transparent conductive layer through the electron transport layer, and the holes in the carrier pairs are transmitted to the other side of the transparent conductive layer through the hole transport layer, thereby forming an electric current.

[0091] As an optional implementation of the present invention, the material of the first transparent conductive layer 21 includes indium tin oxide (ITO) or aluminum zinc oxide (AZO).

[0092] As an optional implementation of the present invention, the material of the second transparent conductive layer 23 includes indium tin oxide or zinc aluminum oxide.

[0093] As an optional embodiment of the present invention, the thickness of the battery cell 20 is 50 μm-120 μm. For example, optionally, the thickness of the battery cell 20 can be 50 μm, 60 μm, 80 μm, 100 μm or 120 μm.

[0094] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention shall be included in the scope of the claims.

Claims

1. A welding strip, characterized in that: The solder strip includes a plurality of extension portions and a plurality of contact portions, wherein the plurality of extension portions are spaced apart along the extension direction of the solder strip, and the plurality of contact portions are connected between each two adjacent extension portions in a one-to-one correspondence, and the contact portion has at least one contact surface for contacting the battery cell, and the contact surfaces of the plurality of contact portions are oriented in the same direction; At least one of the contact portions is provided with a receiving hole, and the receiving hole is filled with an adhesive, and the adhesive is used to adhere and connect the soldering strip to the battery cell attached to the contact surface.

2. The welding strip according to claim 1, characterized in that: The receiving hole penetrates the contact portion along a central axis direction thereof.

3. The welding strip according to any one of claims 1 or 2, characterized in that: The contact surface is flush with the surface of the corresponding side of the extension portion.

4. The welding strip according to any one of claims 1 or 2, characterized in that: The contact portion is cylindrical in shape, and both end cylindrical surfaces of the contact portion form a pair of contact surfaces.

5. The welding strip according to claim 4, characterized in that: The diameter of the contact surface is 0.1 mm-0.3 mm.

6. A photovoltaic module, comprising a plurality of cells and a plurality of welding strips, wherein the plurality of cells are arranged in an array, and the welding strips are connected between adjacent cells, characterized in that: The soldering strip is the soldering strip according to any one of claims 1 to 5, and the soldering strip is adhered and connected to the battery cell via an adhesive.

Images