Solder strip, photovoltaic module and photovoltaic system

Abstract

The embodiment of the utility model provides a solder strip, a photovoltaic module and a photovoltaic system. The solder strip comprises a solder strip body; the solder strip body is provided with at least one through hole for accommodating conductive adhesive, and the through hole penetrates through the first radial direction of the solder strip. In the embodiment of the invention, the through hole for accommodating the conductive adhesive is formed in the welding strip body, so that the conductive adhesive can enter the welding strip body, the conductive adhesive is in contact with the inner wall of the through hole, and the contact area of the conductive adhesive and the welding strip body is relatively increased. When the welding strip is used for welding a battery piece, the conductive adhesive can be fully heated by increasing the contact area of the conductive adhesive and the welding strip body, so that the conductive adhesive has a relatively good curing degree under the condition that the curing temperature is relatively low, the bonding force of the conductive adhesive and the welding strip is improved, the welding strip is not easy to fall off, and the performance of a battery assembly is improved.

Description

Technical Field

[0001] The present application relates to the technical field of solar cells, and in particular to a welding ribbon, a photovoltaic module, and a photovoltaic system. Background Art

[0002] In the field of photovoltaic cells, it is often necessary to connect multiple cells in series through welding ribbons to form photovoltaic modules. With the continuous development of photovoltaic cells, the way of connecting multiple cells in series is also constantly innovating.

[0003] Photovoltaic conductive adhesive is a colloidal material with conductive properties. By applying photovoltaic conductive adhesive between the soldering ribbon and the cell, low-temperature interconnection between the soldering ribbon and the cell can be achieved, thereby protecting the performance of the cell. However, the bonding force between the soldering ribbon and the conductive adhesive depends on the degree of curing of the conductive adhesive. When curing the conductive adhesive at low temperature, the curing time of the conductive adhesive needs to be extended, and the conductive adhesive cannot be completely cured at low temperatures, causing the soldering ribbon to easily fall off. It should be noted that the above content is not necessarily prior art, nor is it used to limit the scope of patent protection of this application. Utility Model Content

[0004] The embodiments of the present application provide a welding strip, a photovoltaic module and a photovoltaic system to solve or alleviate one or more technical problems mentioned above.

[0005] A first aspect of an embodiment of the present application provides a soldering strip, comprising: a soldering strip body;

[0006] The soldering strip body is provided with at least one through hole for accommodating the conductive adhesive, and the through hole penetrates through a first radial direction of the soldering strip body.

[0007] Optionally, at least one perforation is spaced apart along the axial direction of the welding strip; and a spacing between two adjacent perforations is 2 mm to 5 mm.

[0008] Optionally, the inner diameter of the perforation is smaller than a second radial dimension of the welding strip in a second radial direction; the second radial direction is a direction perpendicular to the first radial direction; and the difference between the inner diameter and the second radial dimension is 0.5 mm to 1 mm.

[0009] Optionally, the inner diameter of the perforation satisfies the following relationship:

[0010] 1 / 5(l1×l2) <S<2 / 3(l1×l2) (1)

[0011] In formula (1), S is the inner diameter of the through hole; l1 is the distance between the through hole and the adjacent through hole; l2 is the second radial dimension of the welding strip in the second radial direction.

[0012] Optionally, the at least one perforation includes any one or more of a triangular perforation, a square perforation, a circular perforation, and a star-shaped perforation.

[0013] Optionally, the soldering strip body is further provided with at least one groove for accommodating the conductive adhesive, and the at least one groove is arranged at intervals along the axial direction of the soldering strip.

[0014] Optionally, the number of grooves arranged between two adjacent through holes is 0 to 4.

[0015] Optionally, the width of the groove is 1 mm to 2 mm; the depth of the groove is 0.05 mm to 0.17 mm.

[0016] Optionally, the distance between two adjacent grooves is 1 mm to 3 mm.

[0017] Optionally, the welding ribbon body is made of copper alloy material.

[0018] Optionally, the welding strip body comprises:

[0019] Copper base tape, the copper base tape is made of copper alloy;

[0020] A first coating layer, the first coating layer is coated on a first side surface of the copper base strip along the axial direction of the copper base strip;

[0021] and / or a second coating layer, the second coating layer is coated on a second side surface of the copper base strip along the axial direction of the copper base strip; the second side surface is a side surface opposite to the first side surface;

[0022] The material of the first coating layer and / or the second coating layer is one or more of tin alloy, lead alloy, bismuth alloy, germanium alloy and nickel alloy.

[0023] Optionally, the radial dimension of the copper base tape is 0.1 mm to 0.35 mm;

[0024] The coating thickness of the first coating layer and / or the second coating layer is 8 μm to 15 μm.

[0025] A second aspect of an embodiment of the present application provides a photovoltaic module, including two solar cells, at least two of which are connected in series using the above-mentioned welding ribbon.

[0026] A third aspect of an embodiment of the present application provides a photovoltaic system, comprising the photovoltaic assembly as described above.

[0027] The above technical solution adopted in the embodiment of the present application may have the following advantages:

[0028] A perforation for accommodating the conductive adhesive is provided on the soldering strip body, so that the conductive adhesive can enter the soldering strip body, and the conductive adhesive contacts the inner wall of the perforation, which relatively increases the contact area between the conductive adhesive and the soldering strip body. When soldering the battery cell with the soldering strip, increasing the contact area between the conductive adhesive and the soldering strip body can fully heat the conductive adhesive, so that the conductive adhesive has a better degree of curing at a lower curing temperature, improves the bonding force between the conductive adhesive and the soldering strip, makes the soldering strip less likely to fall off, and improves the performance of the battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0030] Figure 1 is a schematic top view of a welding strip provided in one embodiment of the present application;

[0031] Figure 2 is a schematic top view of a welding strip provided in another embodiment of the present application;

[0032] Figure 3 is a top view schematic diagram of a welding strip provided in another embodiment of the present application;

[0033] Figure 4 It is a structural schematic diagram of the cross section of the welding strip provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. In the accompanying drawings, for clarity, the sizes of layers, regions, elements and their relative sizes may be exaggerated. Wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limitations on the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0035] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there is no intervening element or layer. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present disclosure, the first element, component, region, layer or part discussed below can be represented as the second element, component, region, layer or part. And when the second element, component, region, layer or part is discussed, it does not mean that the present disclosure necessarily has the first element, component, region, layer or part.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] Hereinafter, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. It should be noted that these exemplary embodiments can be implemented in many different forms and should not be construed as being limited to the embodiments described herein.

[0039] like Figures 1 to 4 As shown, an embodiment of the present application provides a soldering tape, which can be used for soldering between batteries and / or between batteries and an external circuit.

[0040] In one example, the welding ribbon is used for welding between the battery and the external circuit. The welding ribbon may connect the positive lead and / or negative lead of the battery to the components of the external circuit, so that current can flow from the battery to the components, thereby realizing the function of the external circuit.

[0041] In one example, the welding ribbon is used for welding between batteries, and multiple batteries can be connected in series or in parallel to increase the voltage, capacity or power of the battery. In the series connection, the welding ribbon connects the positive electrode of one battery to the negative electrode of another battery, so that the current flows through each battery in turn, thereby achieving voltage superposition. In the parallel connection, the welding ribbon connects the positive electrode of one battery to the positive electrode of another battery, and connects the negative electrode of one battery to the negative electrode of another battery, thereby increasing the capacity or power of the entire battery pack. In this case, the welding ribbon plays a connecting and conductive role, ensuring that the current can flow effectively between the batteries. Among them, the battery can be a perovskite battery or a crystalline silicon battery.

[0042] like Figure 1 As shown, the soldering tape provided in the embodiment of the present application includes: a soldering tape body 101. The soldering tape body 101 is provided with at least one through hole for accommodating the conductive adhesive, and the through hole runs through the first radial direction of the soldering tape.

[0043] In one example, the material of the welding strip body 101 can be copper, aluminum, copper alloy or copper-aluminum alloy. These materials have good electrical conductivity, good thermal conductivity and strong plasticity, and can be welded after being melted at high temperature.

[0044] For example, before using the soldering ribbon body 101 to solder the battery cell, a layer of conductive glue can be applied to the surface of the battery cell, and a layer of conductive glue can be applied to the side of the soldering ribbon body 101 that contacts the battery cell; then the soldering ribbon body 101 is covered on the surface of the battery cell, so that the battery cell and the soldering ribbon body 101 are in close contact. After ensuring that the soldering ribbon body 101 is in close contact with the battery cell, the soldering ribbon body 101 and the battery cell are soldered and fixed using a welding device. After the soldering is completed, the conductive glue is thermally cured.

[0045] However, when the conductive adhesive is thermally cured, excessively high temperatures may cause the battery cell to crack, while relatively low temperatures may result in insufficient heat absorbed by the conductive adhesive, causing the conductive adhesive to fail to fully cure, thereby reducing the bonding strength between the conductive adhesive and the solder strip body 101 and causing the solder strip to fall off.

[0046] Based on this, an embodiment of the present application provides a soldering tape, on which a through hole for accommodating a conductive adhesive is provided on a soldering tape body 101 .

[0047] Conductive glue is a liquid glue with conductive properties. It is composed of a polymer matrix and conductive particles. By applying the conductive glue to the part that needs to be conductive, the conductive properties can be enhanced.

[0048] The embodiment of the present application increases the contact between the conductive adhesive and the inner wall of the perforated hole of the solder strip body 101 by opening a perforated hole on the solder strip body 101, that is, increases the contact area between the conductive adhesive and the solder strip body 101. Such a structure allows the conductive adhesive to absorb heat during the process of melting the solder strip body 101, and also to obtain relatively high heat during the subsequent low-temperature curing process of the conductive adhesive, thereby promoting complete curing of the conductive adhesive.

[0049] For example, the number of perforations provided on the solder strip body 101 may be one or more. When the number of perforations is a small number such as one or two, the shape of the perforations may be a strip extending from the first position along the axial direction of the solder strip body 101, so that the conductive glue in the perforations can act on more welding positions to ensure stable welding.

[0050] In one example, when the soldering tape provided by the embodiment of the present application is used to solder the battery cell, the conductive glue may be applied to the contact surface between the soldering tape body 101 and the battery cell, and then the soldering tape body 101 may be tightly covered on the battery cell. At this time, the conductive glue will be squeezed onto the two perforations of the soldering tape body 101, thereby increasing the contact area between the conductive glue and the soldering tape body 101. When the soldering tape body 101 is soldered, the conductive glue can absorb the heat generated during the soldering.

[0051] In one example, when the soldering ribbon provided by the embodiment of the present application is used to solder the battery cell, the conductive glue may be injected into the through hole, and then the soldering ribbon body 101 may be tightly covered on the battery cell.

[0052] In the embodiment of the present application, the first radial direction of the perforation penetrating the solder strip may refer to the radial direction of the solder strip body 101 from the side away from the battery cell toward the side close to the battery cell, so that the conductive glue can contact the battery cell along the perforation.

[0053] In the embodiment of the present application, by providing a through hole for accommodating the conductive glue on the solder strip body 101, the conductive glue can enter the solder strip body 101, and the contact between the conductive glue and the inner wall of the through hole relatively increases the contact area between the conductive glue and the solder strip body 101. The conductive glue can absorb heat in the process of melting the solder strip body 101, and can also obtain relatively high heat in the subsequent low-temperature curing process of the conductive glue, thereby promoting the complete curing of the conductive glue.

[0054] In one example, at least one perforation is spaced apart along the axial direction of the welding strip, and the spacing between two adjacent perforations is 2 mm to 5 mm. Exemplarily, the spacing between two adjacent perforations is 2 mm, 3 mm, 4 mm or 5 mm.

[0055] If the spacing between two adjacent perforations on the soldering ribbon is too large, the number of perforations is small, and the contact area between the conductive adhesive and the soldering ribbon is insufficient for the conductive adhesive to solidify, thereby affecting the bonding strength between the conductive adhesive and the soldering ribbon. Conversely, if the spacing between two adjacent perforations on the soldering ribbon is too small, the area between the perforations in the soldering ribbon becomes fragile, and the soldering ribbon is prone to cracking.

[0056] In the embodiment of the present application, by limiting the spacing between the perforations to 2mm to 5mm, it can be ensured that the structural strength of the solder strip is large enough while the conductive adhesive and the solder strip can be fully in contact, so that the conductive adhesive can fully absorb heat during welding, thereby improving the curing degree of the conductive adhesive, and improving the bonding strength between the conductive adhesive and the solder strip, making the solder strip not easy to fall off, thereby improving the performance of the battery.

[0057] In one example, the inner diameter of the perforation is smaller than the second radial dimension of the welding strip in the second radial direction; the second radial direction is a direction perpendicular to the first radial direction; and the difference between the inner diameter and the second radial dimension is 0.5 mm to 1 mm.

[0058] Specifically, the second radial direction may be the width direction of the welding strip body 101, and the first radial direction may be the height direction of the welding strip body 101. The inner diameter of the perforation is smaller than the second radial dimension of the welding strip in the second radial direction, which means that the inner diameter of the perforation is smaller than the width of the welding strip body 101. The difference between the inner diameter and the second radial dimension is 0.5 mm to 1 mm. After the perforation is set on the welding strip body 101, there is a certain distance between the perforation and the two side surfaces of the welding strip body 101, which ensures the strength of the structure of the welding strip body 101.

[0059] In one example, the inner diameter of the through hole satisfies the following relationship:

[0060] 1 / 5(l 1 × 2 ) <S<2 / 3(l 1 × 2 )(1)

[0061] In formula (1), S is the cross-sectional area of ​​the perforation; 1 is the distance between the perforation and the adjacent perforation, l 2 is a second radial dimension of the welding strip body 101 in the second radial direction.

[0062] Based on this formula, the inner diameter of the perforation is limited by the spacing between the perforations and adjacent perforations and the second radial dimension of the solder strip body 101. When it is necessary to open perforations in solder strip bodies 101 of different specifications, it is possible to determine the appropriate inner diameter of the perforations to be opened on the solder strip body 101 according to its specifications, and to determine the appropriate number of perforations.

[0063] In formula (1), the coefficient range of 1 / 5 and 2 / 3 can be regarded as the ratio of the amount of conductive adhesive to the amount of solder tape.

[0064] In one example, at least one perforation includes any one or more of a triangular perforation, a square perforation, a circular perforation, and a star-shaped perforation, which is not limited here. It is only necessary to ensure that the perforation can provide a larger contact area for the conductive adhesive and will not affect the structural stability of the solder strip.

[0065] For example, Figure 1 As shown, the through-hole is a square through-hole 102 . The square through-hole 102 has a simple geometric shape, is easy to manufacture, and can provide a relatively uniform contact area.

[0066] For example, Figure 2 As shown, the through hole is a triangular through hole 103. Since the triangular through hole 103 has three contact surfaces, the conductive adhesive and the soldering strip can have a relatively large contact area.

[0067] For example, Figure 3 As shown, the through hole is a star-shaped through hole 104. Since the star-shaped through hole 104 has ten contact surfaces, the conductive adhesive and the soldering ribbon can have a relatively larger contact area.

[0068] In some exemplary application scenarios, the plurality of through-holes on a welding ribbon may include through-holes of different shapes.

[0069] In the embodiment of the present application, by providing various shapes of perforations on the welding strip, the stress generated after welding can be released. Specifically, the welding strip will generate stress due to external factors during the welding process, and the generated stress will cause the welding strip to be easily deformed or cracked. The external factors may refer to high temperature heating during the welding process or different temperatures of different parts of the welding strip when the welding strip is cooled after the welding is completed. Providing perforations on the welding strip can break the continuity of the welding strip structure and form a loose structure, thereby helping to release the stress generated after welding.

[0070] In one embodiment, the soldering ribbon body is further provided with at least one groove for accommodating the conductive adhesive, and the at least one groove is arranged at intervals along the axial direction of the soldering ribbon.

[0071] The groove is a radial structure that does not penetrate the welding strip body.

[0072] By providing the groove, the contact area between the conductive adhesive and the solder strip body is increased, and the conductive adhesive can absorb more heat during welding, so the conductive adhesive is better cured, further improving the bonding force between the conductive adhesive and the solder strip.

[0073] In the embodiment of the present application, the contact area between the solder strip and the conductive adhesive is increased by coordinating the grooves and the perforations, while ensuring that the structure of the solder strip is stable and does not easily break. In one example, the number of grooves set between two adjacent perforations is 0 to 4. Exemplarily, the number of grooves can be 0, 1, 2, 3 or 4, which is not limited here. It is only necessary to ensure that there is a large contact area between the solder strip and the conductive adhesive and that the structural stability of the solder strip is not affected.

[0074] In one example, the width of the groove is 1mm to 2mm, and illustratively, the width of the groove can be 1mm, 1.25mm, 1.5mm, 1.75mm or 2mm; the depth of the groove is 0.05mm to 0.17mm, and illustratively, the depth of the groove can be 0.05mm; the spacing between two adjacent grooves is 1mm to 3mm, and illustratively, the spacing between the grooves can be 1mm, 2mm or 3mm. The width, depth and spacing between the grooves in this example can ensure that the structural strength of the solder strip is large enough while allowing the conductive adhesive to fully contact the solder strip.

[0075] In this embodiment, by further providing a groove on the basis of the solder strip body having perforations, on the one hand, the contact area between the solder strip body and the conductive adhesive can be further increased, and on the other hand, the number of perforations on the solder strip body can be relatively reduced, thereby ensuring that the conductive adhesive has more contact area with the solder strip body. At the same time, the structural strength of the solder strip body will not be insufficient due to too many perforations.

[0076] In one example, the soldering ribbon body 101 may be made of a copper alloy material. The material of the soldering ribbon body 101 may be made of various materials or various solutions known to those skilled in the art now and in the future, and is not limited here.

[0077] In one example, if Figure 4 As shown, the soldering strip body 101 may include: a copper base strip 1010 , which is made of a copper alloy. This is because the copper alloy has excellent electrical conductivity and is cheap and easily available, so it can be used to prepare the soldering strip body 101 .

[0078] The welding strip body 101 may further include a first coating layer 1011 and a second coating layer 1012. The first coating layer 1011 is coated on a first side of the copper base strip along the axial direction of the copper base strip, and the first coating layer 1012 is coated on a second side of the copper base strip along the axial direction of the copper base strip, and the second side is a side opposite to the first side. The material of the first coating layer 1011 and / or the first coating layer 1012 is selected from one or more of tin alloy, lead alloy, bismuth alloy, germanium alloy and nickel alloy.

[0079] In the embodiments of the present application, tin alloy, lead alloy, bismuth alloy, germanium alloy and nickel alloy all have good conductivity. Therefore, one or more of tin alloy, lead alloy, bismuth alloy, germanium alloy and nickel alloy are coated on two axially opposite sides of the copper base strip to enhance the conductivity of the soldering strip.

[0080] In one example, the radial dimension of the copper base tape is 0.1 mm to 0.35 mm. For example, the radial dimension of the copper base tape can be 0.1 mm, 0.2 mm, 0.3 mm or 0.35 mm. The radial dimension of the copper base tape determines the electrical conductivity and load-bearing capacity of the welding strip. The larger radial dimension of the copper base tape can make the welding strip have higher electrical conductivity and stronger mechanical strength. However, the excessive radial dimension of the copper base tape will increase the difficulty of heat conduction of the welding strip during welding, and the welding effect is not good. The radial dimension of the copper base tape provided in this example can ensure that the welding strip has higher electrical conductivity and stronger mechanical strength on the one hand, and on the other hand, the heat conduction of the welding strip during welding will not be affected by the excessive thickness of the copper base tape.

[0081] In one example, the coating thickness of the first coating layer 1011 and / or the first coating layer 1012 is 8 μm to 15 μm. For example, the coating thickness of the first coating layer 1011 and / or the first coating layer 1012 may be 8 μm, 10 μm, 12 μm, 14 μm or 15 μm. The coating thickness of the first coating layer 1011 and / or the first coating layer 1012 may affect the corrosion resistance and conductivity of the welding strip. Specifically, a thicker coating may provide better corrosion resistance, but may increase welding resistance and reduce conductivity. Among them, welding resistance refers to the formation of a weld after the metal material in the welding area of ​​the welding strip melts during the welding process, thereby hindering the flow of current. On the other hand, a thinner coating may reduce welding resistance, thereby improving the conductivity of the conductive welding strip, but may lack sufficient corrosion resistance in some environments. The coating thickness range of the first coating layer 1011 and / or the first coating layer 1012 provided in this example can ensure that the welding strip has good corrosion resistance and low welding resistance.

[0082] In the following, a structure of a welding strip provided in an embodiment of the present application and a related comparative example will be used to weld battery cells, and the performance of the battery cells will be tested.

[0083] [Example 1]

[0084] The welding strip body is made of copper alloy. There are 4 rectangular perforations on the welding strip body, and the interval between adjacent rectangular perforations is 3mm. Among them, the length of the rectangular perforation is 1mm and the width is 0.5mm.

[0085] [Example 2]

[0086] The welding strip body is made of copper alloy. There are 4 rectangular perforations on the welding strip body, and there is a rectangular groove between two adjacent perforations. The number of rectangular grooves is 3; the interval between adjacent rectangular perforations is 3mm, and the interval between adjacent rectangular grooves is 3mm. Among them, the length of the rectangular perforation is 1mm and the width is 0.5mm.

[0087] [Comparative Example 1]

[0088] The welding strip body is made of copper alloy and has no perforations or grooves.

[0089] The following is a performance test of the soldering tapes provided in Examples 1 to 2 of the present application and Comparative Example 1, so as to obtain the bonding strength between the corresponding soldering tapes and the battery cells after welding, and the test results are shown in Table 1. TC200 refers to 200 times of high and low temperature cycle test (Thermal Cycling test), and the test conditions are -40℃~80℃.

[0090] Table 1 Performance test results of the welding strips provided in Examples 1 to 2 and Comparative Example 1

[0091]

[0092] It can be seen from Table 1 above that, compared with Comparative Example 1, the bonding force between the soldering tapes and the battery cells of Examples 1 to 2 of the present application is significantly increased.

[0093] The embodiment of the present application may also provide a photovoltaic module, comprising at least two battery cells, wherein the at least two battery cells are connected in series using the above-mentioned welding ribbon.

[0094] The embodiment of the present application can provide a photovoltaic system, including the photovoltaic components in any of the above embodiments. The advantages of the above photovoltaic components are also possessed by the photovoltaic system, which will not be repeated here. The above photovoltaic system has a wide range of applications, not only limited to photovoltaic power stations, such as ground power stations, rooftop power stations and water power stations, but also includes various equipment and devices that use solar energy to generate electricity, such as user solar power supplies, solar street lights, solar cars and solar buildings. Of course, it can be understood that the application scenarios of the photovoltaic system are not limited to this, that is to say, the photovoltaic system can be used in all fields where solar energy is required for power generation. Taking the photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a junction box and an inverter. The photovoltaic array may be an array combination of multiple photovoltaic components. For example, multiple photovoltaic components may form multiple photovoltaic arrays. The photovoltaic array is connected to a junction box. The junction box can converge the current generated by the photovoltaic array. The converged current flows through the inverter and is converted into the alternating current required by the mains power grid, and then connected to the mains network to realize solar power supply.

[0095] It should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The orientation words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Therefore, the exemplary term "above..." can include both "above..." and "below..." orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here are interpreted accordingly.

[0096] It should also be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this application refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0097] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0098] It should also be noted that the above are only preferred embodiments of the present application, and the patent protection scope of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A welding strip, characterized in that: include: Welding strip body; The soldering strip body is provided with at least one through hole for accommodating the conductive adhesive, and the through hole runs through the first radial direction of the soldering strip body; Wherein, at least one of the perforations is arranged at intervals along the axial direction of the welding strip; and the spacing between two adjacent perforations is 2 mm to 5 mm; Wherein, the soldering strip body is further provided with at least one groove for accommodating the conductive adhesive, and at least one of the grooves is arranged at intervals along the axial direction of the soldering strip.

2. The welding strip according to claim 1, characterized in that: The inner diameter of the perforation is smaller than the second radial dimension of the welding strip in the second radial direction; the second radial direction is a direction perpendicular to the first radial direction; the difference between the inner diameter and the second radial dimension is 0.5 mm to 1 mm.

3. The welding strip according to claim 2, characterized in that: The inner diameter of the perforation satisfies the following relationship: 1 / 5 ( l 1 2 2 / 3 ( l 1 2)（1） In formula (1), S is the inner diameter of the perforation; l 1 is the distance between the perforation and the adjacent perforation, l 2 is the second radial dimension of the welding strip in the second radial direction.

4. The welding strip according to any one of claims 1 to 3, characterized in that: At least one of the perforations includes any one or more of a triangular perforation, a square perforation, a circular perforation, and a star-shaped perforation.

5. The welding strip according to claim 4, characterized in that: The number of the grooves arranged between two adjacent through holes is 0 to 4.

6. The welding strip according to claim 5, characterized in that: The width of the groove is 1 mm to 2 mm; the depth of the groove is 0.05 mm to 0.17 mm.

7. The welding strip according to claim 5, characterized in that: The distance between two adjacent grooves is 1 mm to 3 mm.

8. The welding strip according to claim 1, characterized in that: The welding strip body is made of copper alloy material.

9. The welding strip according to claim 1, characterized in that: The welding strip body comprises: A copper base strip, wherein the copper base strip is made of a copper alloy; A first coating layer, wherein the first coating layer is coated on a first side surface of the copper base strip along an axial direction of the copper base strip; And / or a second coating layer, wherein the second coating layer is coated on a second side surface of the copper base strip along the axial direction of the copper base strip; the second side surface is a side surface opposite to the first side surface.

10. The welding strip according to claim 9, characterized in that: The radial dimension of the copper base tape is 0.1 mm to 0.35 mm; The coating thickness of the first coating layer and / or the second coating layer is 8 μm to 15 μm.

11. A photovoltaic module, characterized in that: include: At least one battery string, the battery string comprising at least two battery cells, the at least two battery cells being connected in series using the welding ribbon as described in any one of claims 1 to 10.

12. A photovoltaic system, characterized in that: Comprising the photovoltaic module as claimed in claim 11.

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