Solar cells, photovoltaic modules and photovoltaic systems
By setting the solder of the tin wire on the pad of the solar cell and the molten solder of the flow-through soldering tape, the problem of reducing the effective solder area of the soldering tape in the main gateless structure is solved, and the welding tension and battery stability are enhanced.
Patent Information
- Application Number
- CN202421239051.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-05-31
AI Technical Summary
When welding solar cells without main gate structure, the effective welding area of the welding tape is reduced, resulting in a reduction in the welding tension between the welding tape and the pad, which is prone to problems such as offset and desoldering of the welding tape.
A tin guide wire is provided on the pad to converge the solder melted solder flow onto the pad, increasing the effective solder area on the pad, thereby enhancing the solder tension between the solder tape and the pad.
By increasing the effective welding area on the pad, the welding tape and the pad are welded more firmly, enhancing the stability of the solar cell and avoiding the risk of the welding tape falling off or being offset easily during the lamination process.
Smart Images
Figure CN222706900U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of solar cells, and in particular to a solar cell, a photovoltaic module and a photovoltaic system. Background Art
[0002] The soldering ribbon in the solar cell can be used to connect multiple solar cells so that they form a series or parallel circuit, thereby jointly outputting electrical energy. The soldering ribbon can be welded on the surface of the solar cell, corresponding to the main grid position on the surface of the cell, and the main grid can conduct the charge from the fine grid to the soldering ribbon.
[0003] Solar cells can also be made without a main grid structure, where the charge is directly transferred from the thin grid to the solder strip. After removing the main grid, the shading on the surface of the cell is reduced, and more light can enter the interior of the cell, thereby improving the photoelectric conversion efficiency of the solar cell.
[0004] However, without the welding area provided by the main grid, the effective welding area of the welding ribbon is reduced, resulting in a decrease in the welding tension between the welding ribbon and each pad. The reduction in welding tension between pads may cause problems such as welding ribbon deviation and desoldering during battery lamination.
[0005] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Utility Model Content
[0006] The embodiments of the present application provide a solar cell, a photovoltaic module and a photovoltaic system to solve or alleviate one or more of the technical problems mentioned above.
[0007] In a first aspect, an embodiment of the present application provides a solar cell, the surface of which includes:
[0008] fine grid;
[0009] A soldering pad is fixed on the fine grid to form a soldering point for soldering the soldering strip;
[0010] The tin guide wire has a first end and a second end opposite to each other; the first end is connected to the soldering pad, and the second end is an extended end of the tin guide wire extending away from the soldering pad, and the direction of the tin guide wire is adapted to the direction of the soldering strip.
[0011] Optionally, there are multiple fine grids, and the multiple fine grids are arranged in stripes on the surface of the solar cell;
[0012] There are multiple pads, and the pads are arranged along a fine grid at a preset spacing distance, and are arranged along a direction forming a second preset angle with the fine grid according to a preset number of fine grid spacings.
[0013] Optionally, the tin conductor and the fine grid form a first preset angle; the first preset angle is matched with the second preset angle.
[0014] Optionally, the second end of the tin conductor is close to a fine grid adjacent to the pad, and the second end is spaced apart from the fine grid by a first preset distance, wherein the first preset distance is 1 / 40 to 1 / 10 of a spacing between adjacent fine grids.
[0015] Optionally, the second end of the tin conductor extends to a fine grid adjacent to the pad and exceeds the fine grid by a second preset distance, where the second preset distance is 1 / 20 to 1 / 10 of a spacing between adjacent fine grids.
[0016] Optionally, one soldering pad is provided with a corresponding tin-conducting wire; and the directions of the tin-conducting wires corresponding to the plurality of soldering pads are the same.
[0017] Optionally, one soldering pad is provided with two tin-conducting wires correspondingly; the two tin-conducting wires extend from opposite sides of the soldering pad to the second end respectively.
[0018] Optionally, at least two tin-conducting wires are provided corresponding to one soldering pad, and the at least two tin-conducting wires are arranged side by side on one side of the soldering pad; and the spacing between adjacent tin-conducting wires is adapted to the width of the soldering strip.
[0019] Optionally, the surface of the solar cell further includes: centipede feet, the number of the centipede feet is multiple;
[0020] Centipede feet are provided on the plurality of fine grids between two adjacent welding pads along the direction of the welding pad which forms a second preset angle with the fine grid;
[0021] The centipede foot is located on an extension line of the pad along a second preset angle with the fine grid.
[0022] A second aspect of an embodiment of the present application provides a photovoltaic assembly, including:
[0023] At least one battery string, the battery string includes at least two solar cells as described above.
[0024] A third aspect of an embodiment of the present application provides a photovoltaic system, comprising the photovoltaic assembly as described above.
[0025] The above technical solution adopted in the embodiment of the present application may have the following advantages:
[0026] By arranging the tin guide wire on the pad, the molten solder of the welding ribbon is guided and gathered on the pad, thereby increasing the effective welding area on the pad. Furthermore, the effective welding area of the welding ribbon as a whole is increased, and the welding ribbon and the pad are welded more firmly, thereby increasing the welding tension between the welding ribbon and each pad, and the welding ribbon will not fall off or shift easily when the battery is laminated or under the influence of other external factors, thereby enhancing the overall stability of the solar cell. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] 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.
[0028] Figure 1 is a schematic diagram of the structure of the surface of a solar cell provided in an embodiment of the present application;
[0029] Figure 2 yes Figure 1 A partial enlarged view of
[0030] Figure 3 This is a schematic diagram of the structure of a solder pad on the surface of a solar cell provided in an embodiment of the present application;
[0031] Figure 4 It is a schematic diagram of the structure of another welding pad on the surface of a solar cell provided in an embodiment of the present application;
[0032] Figure 5 This is a schematic diagram of the structure of another welding pad on the surface of a solar cell provided in an embodiment of the present application. DETAILED DESCRIPTION
[0033] 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.
[0034] 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.
[0035] 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.
[0036] 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.
[0037] 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.
[0038] like Figures 1 to 5 As shown, an embodiment of the present application provides a solar cell. The surface of the solar cell includes: a fine grid 300 , a solder pad 100 and a tin conductor 200 .
[0039] The fine grid 300 is printed on the surface of the solar cell to conduct current out of the cell.
[0040] The pad 100 is fixed on the fine grid 300 to form a welding point for welding the welding strip.
[0041] The tin conductor 200 has a first end and a second end opposite to each other. The first end is connected to the pad 100, and the second end is an extended end of the tin conductor 200 extending in a direction away from the pad 100, and the direction of the tin conductor 200 is adapted to the direction of the solder strip. Specifically, the first end of the tin conductor 200 is connected to the pad 100; and with the pad 100 as the starting point, the tin conductor 200 extends in a direction away from the pad 100, and the extended end (second end) formed is far away from the pad 100.
[0042] The pad 100 can be printed at a designated position on the fine grid 300. The pad 100 is used to attach the soldering tape to the pad 100 during soldering of the soldering tape and perform soldering.
[0043] By welding the welding ribbon on the solar cell, multiple solar cells can be connected in series or in parallel to form a cell string or a photovoltaic module. A photovoltaic module can include one or more cell strings.
[0044] The grid line structure of the solar cell includes a main grid structure and a non-main grid structure. The non-main grid structure is a structure without a printed main grid, but with a plurality of printed fine grids 300. The non-main grid structure can reduce the amount of silver paste used; at the same time, it can reduce the shielding of sunlight and improve the light absorption rate.
[0045] However, for solar cells without a main grid structure, when the solar cells are welded, the welding area for fixing the welding ribbon is reduced, which may easily cause the welding ribbon to fall off and the welding to be loose. In this regard, by printing the welding pads 100 at multiple designated positions on the fine grid 300, the welding ribbon and the welding pads 100 are welded and fixed, and the battery can be firmly welded. In order to make the welding firmness of the welding ribbon meet higher requirements, more welding pads 100 are usually printed on the fine grid 300. However, too many welding pads 100 will also affect the absorption of light by the solar cell. In addition, the welding and fixing of the welding ribbon and the welding pad 100 is always a line-to-point contact, and the welding tension is limited. For the changeable outdoor environment, the welding firmness of the welding ribbon and the solar cell needs to be further strengthened. The reduction of the welding tension between the welding pads 100 may make the battery prone to problems such as welding ribbon offset and desoldering when laminating.
[0046] In view of the problem that the effective welding area of the main grid-less battery is small and the tension between the pads 100 is insufficient, a solar cell provided in this embodiment is provided with a tin guide wire 200 structure at the pad 100. The first end of the tin guide wire 200 is connected to the pad 100 and extends to the second end in a direction away from the pad 100, and the direction of the tin guide wire 200 is adapted to the direction of the solder strip.
[0047] In one example, the tin conductive wire 200 may be a straight line, or may be a curve with a certain curvature, and may have a first end and a second end opposite to each other.
[0048] In one example, when the tin conductor 200 is a curve, its curvature may be k mm. -1 , the value range of k can be 0<k≤0.5.
[0049] When soldering the soldering ribbon, firstly, the soldering ribbon is attached to the soldering pad 100 and attached to the tin guide wire 200. When the soldering ribbon is heated, the tin on the surface of the soldering ribbon is melted. Due to the contact between the soldering ribbon and the tin guide wire 200, the tin guide wire 200 can guide the molten tin of the soldering ribbon to the soldering pad 100, so that the solder spreading area on the soldering pad 100 becomes larger, that is, the effective soldering area on the soldering pad 100 is increased.
[0050] In this embodiment, by arranging the tin conductor 200 on the pad 100, the molten solder of the soldering ribbon is directed to the pad 100, thereby increasing the effective soldering area on the pad 100. Furthermore, the effective soldering area of the entire soldering ribbon is increased, and the soldering ribbon and the pad 100 are more firmly soldered, thereby increasing the soldering tension between the soldering ribbon and each soldering pad 100, and the soldering ribbon will not easily fall off or shift when the battery is laminated or under the influence of other external factors, thereby enhancing the overall stability of the solar cell.
[0051] In an optional embodiment, there are multiple fine grids 300, which are arranged in stripes on the surface of the solar cell; there are multiple soldering pads 100, which are arranged along a fine grid 300 at a preset spacing distance, and are arranged along a direction at a second preset angle to the fine grid 300 according to a preset number of spacings between the fine grids 300.
[0052] In one example, the plurality of fine gates 300 may be distributed in parallel in a transverse direction or in other stripe-like distributions, as long as the fine gates 300 are able to conduct current.
[0053] In one example, the width of each fine grid 300 may be between 30 μm and 50 μm, and the thickness may be between 3 μm and 9 μm, so as to ensure that the fine grid 300 does not significantly block light while achieving effective current conduction.
[0054] In an example, the shape of the pad 100 can be rectangular, circular, trapezoidal, etc. The shape, number and size of the pad 100 can be designed according to actual application requirements and are not limited here.
[0055] In one example, a plurality of pads 100 are arranged on a thin grid 300 at a preset spacing distance, the preset spacing may be 4 mm, and the number of thin grids 300 spacings of the plurality of pads 100 may be 8. The plurality of pads 100 are arranged linearly along a direction forming a second preset angle with the thin grid 300, the second preset angle may be 90°. That is, the plurality of pads 100 may be arranged in a matrix.
[0056] In this embodiment, by providing a plurality of fine grids 300 arranged in a stripe pattern on the surface of the battery and providing solder pads 100 arranged at intervals on the fine grids 300, when soldering the solder strips, the charge can be conducted from the inside of the battery cell to the plurality of fine grids 300 on the surface, and the plurality of fine grids 300 conduct the charge to the solder strips on the solder pads 100, and then the charge is transmitted to the outside through the solder strips, thereby realizing series or parallel connection between a plurality of batteries.
[0057] In an optional embodiment, the tin conductor 200 and the fine grid 300 form a first preset angle; the first preset angle is matched with the second preset angle.
[0058] The first preset angle refers to the angle formed by the solder guide wire 200 and the fine grid 300, and the second preset angle refers to the angle formed by the plurality of pads 100 arranged in a longitudinal straight line and the fine grid 300.
[0059] In one example, the first preset angle is adapted to the second preset angle, the first preset angle is 90°, that is, the second preset angle is also 90°, that is, the extension direction of the second end of the tin conductor 200 points to the adjacent soldering pad 100 of the soldering pad 100.
[0060] In this embodiment, the first preset angle is set to match the second preset angle, and the tin conductor 200 is in the same straight line with the pad 100 arranged in a longitudinal straight line. When welding the soldering strip, the soldering strip, the tin conductor 200 and the pad 100 are distributed in the same straight line direction, and the soldering strip can overlap with each pad 100 and the tin conductor 200, ensuring the reliability of each welding point, thereby increasing the connection strength between the soldering strip and the pad 100, and enhancing the overall stability of the battery.
[0061] In an optional embodiment, the second end of the tin conductor 200 is close to the fine grid 300 adjacent to the pad 100 , and the second end is spaced apart from the fine grid 300 by a first preset distance, which is 1 / 40 to 1 / 10 of the spacing between adjacent fine grids 300 .
[0062] The second end of the tin-conducting wire 200 extending outward is spaced apart from the fine grid 300 adjacent to the pad 100 , that is, the tin-conducting wire 200 does not penetrate the fine grid 300 .
[0063] In one example, the first preset interval may be 1 / 30.
[0064] In this embodiment, by setting a structure in which the tin conductor 200 does not penetrate the fine grid 300, on the one hand, it ensures that the tin conductor 200 can guide the molten solder to the pad 100 during welding, thereby increasing the effective welding area; on the other hand, the shading area of the tin conductor 200 is reduced, thereby improving the photoelectric conversion efficiency of the battery.
[0065] In an optional embodiment, the second end of the tin conductor 200 extends to the fine grid 300 adjacent to the pad 100 and exceeds the fine grid 300 by a second preset distance, where the second preset distance is 1 / 20 to 1 / 10 of the spacing between adjacent fine grids 300 .
[0066] The second end of the tin-conducting wire 200 extends beyond the fine grid 300 adjacent to the pad 100 , that is, the tin-conducting wire 200 passes through the fine grid 300 .
[0067] In one example, the second preset distance may be 1 / 15.
[0068] In this embodiment, by setting a structure in which the tin conductor 200 passes through the fine grid 300, the contact area between the tin conductor 200 and the soldering strip is increased. When soldering the soldering strip, more molten solder can flow along the tin conductor 200 passing through the fine grid 300 to the corresponding soldering pad 100, thereby increasing the effective soldering area and achieving a better soldering effect.
[0069] In an optional embodiment, one solder pad 100 is provided with a corresponding tin-conducting wire 200 ; and the directions of the tin-conducting wires 200 corresponding to a plurality of solder pads 100 are the same.
[0070] like Figure 3 As shown, a corresponding tin-conducting wire 200 is disposed on a soldering pad 100 , and the second ends of the plurality of tin-conducting wires 200 point in the same direction, which is the same as the longitudinal arrangement direction of the soldering pads 100 .
[0071] In this embodiment, by setting a tin guide wire 200 on the soldering pad 100, it is possible to maximize the saving of raw materials for the printed tin guide wire 200, and at the same time, the solder can flow to the corresponding soldering pad 100 during soldering of the solder strip, thereby increasing the effective soldering area. Compared with a main-grid-free battery without a tin guide wire 200, the solder strip has a better welding effect and a better battery stability.
[0072] In an optional embodiment, two tin-conducting wires 200 are correspondingly provided for one soldering pad 100 ; the two tin-conducting wires 200 extend from opposite sides of the soldering pad 100 to the second end respectively.
[0073] like Figure 4 As shown, two tin-conducting wires 200 are disposed on a soldering pad 100 , and the first ends of the two tin-conducting wires 200 are on opposite sides of the soldering pad 100 , and the second ends extend to opposite directions respectively.
[0074] In this embodiment, by setting a tin guide wire 200 at each end of the soldering pad 100, the overall length of the tin guide wire 200 is effectively increased. Compared with the soldering pad 100 with one tin guide wire 200, the soldering pad 100 with a tin guide wire 200 at each end can gather more molten solder, thereby further increasing the effective welding area.
[0075] In an optional embodiment, at least two tin-conducting wires 200 are correspondingly provided to one soldering pad 100 , and at least two tin-conducting wires 200 are arranged side by side on one side of the soldering pad 100 ; and the spacing between adjacent tin-conducting wires 200 is adapted to the width of the soldering strip.
[0076] like Figure 5 As shown, two tin-conducting wires 200 are disposed on a pad 100 , and the first ends of the two tin-conducting wires 200 are on the same side of the pad 100 , and the second ends extend to the same direction, that is, they are disposed side by side on one side of the pad 100 .
[0077] In this embodiment, by arranging two tin-conducting wires 200 on the same side of the pad 100, the pad 100 with two tin-conducting wires 200 can gather more molten solder, and further increase the effective welding area, compared with the pad 100 with only one tin-conducting wire 200. Moreover, the spacing between the two tin-conducting wires 200 is adapted to the width of the soldering strip, which can ensure that the tin-conducting wires 200 are completely covered by the soldering strip, so that the soldering area is larger, the soldering reliability is higher, and the occurrence of soldering defects and cold solder joints during the soldering process can be reduced.
[0078] In an optional embodiment, if Figures 1-2 As shown, the surface of the solar cell also includes: centipede feet 400, the number of centipede feet 400 is multiple; in the direction of the soldering pad 100 along the second preset angle with the fine grid 300, centipede feet 400 are provided on multiple fine grids 300 between two adjacent soldering pads 100; the centipede feet 400 are located on the extension line of the soldering pad 100 along the second preset angle with the fine grid 300.
[0079] In the direction of the pad 100 that is at a second preset angle with the fine grid 300, that is, on the straight line of the pad 100 longitudinal distribution, a centipede foot 400 is provided on the fine grid 300 between adjacent pads 100. A fine grid 300 and a centipede foot 400 can be formed together by screen printing, that is, the centipede foot 400 is a part of the fine grid 300. In some embodiments, the centipede foot 400 can be a rectangular structure with a hollow middle, so as to form a larger welding area than the fine grid 300. The centipede foot 400 is used to serve as a welding point of the welding strip together with the pad 100. The welding area of the centipede foot 400 is smaller than that of the pad 100. The welding strip is placed along the arrangement direction of the centipede foot 400, and the welding strip covers each centipede foot 400. After the welding strip is welded and fixed on the centipede foot 400, it can form an electrical contact with the centipede foot 400.
[0080] In this embodiment, by providing centipede feet 400 on the fine grid 300 as welding points other than the welding pad 100, the effective welding area can be increased, the welding of the welding strip can be made more firm, and the overall stability of the battery can be improved.
[0081] The embodiment of the present application may also provide a photovoltaic assembly, including at least one battery string, the battery string including at least two solar cells as described above, and adjacent solar cells may be connected together by series welding.
[0082] 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.
[0083] 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.
[0084] 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 describing a specific feature, structure or characteristic 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.
[0085] 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.
[0086] 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 solar cell, characterized in that: The surface of the solar cell comprises: fine grid; A soldering pad, the soldering pad being fixed on the fine grid to form a soldering point for soldering a soldering strip; The tin guide wire has a first end and a second end opposite to each other; the first end is connected to the soldering pad, and the second end is an extended end of the tin guide wire extending in a direction away from the soldering pad, and the direction of the tin guide wire is adapted to the direction of the soldering strip.
2. The solar cell according to claim 1, characterized in that The number of the fine grids is multiple, and the multiple fine grids are arranged in stripes on the surface of the solar cell; There are a plurality of pads, and the pads are arranged along one of the fine grids at a preset spacing distance, and are arranged along a direction forming a second preset angle with the fine grid at a preset number of fine grid spacings.
3. The solar cell according to claim 2, characterized in that: The tin conductor and the fine grid form a first preset angle; the first preset angle is matched with the second preset angle.
4. The solar cell according to claim 2, characterized in that: The second end is close to the fine grid adjacent to the pad, and the second end is spaced apart from the fine grid by a first preset distance, wherein the first preset distance is 1 / 40 to 1 / 10 of a spacing between adjacent fine grids.
5. The solar cell according to claim 2, characterized in that: The second end extends to the fine grid adjacent to the pad and exceeds the fine grid by a second preset distance, where the second preset distance is 1 / 20 to 1 / 10 of a spacing between adjacent fine grids.
6. The solar cell according to any one of claims 1 to 5, characterized in that: One soldering pad is correspondingly provided with one tin-conducting wire; and the directions of the tin-conducting wires corresponding to a plurality of soldering pads are the same.
7. The solar cell according to any one of claims 1 to 5, characterized in that: Two tin-conducting wires are correspondingly arranged on one soldering pad; the two tin-conducting wires extend from opposite sides of the soldering pad to the second end respectively.
8. The solar cell according to any one of claims 1 to 5, characterized in that: At least two tin-conducting wires are correspondingly arranged on one pad, and at least two tin-conducting wires are arranged side by side on one side of the pad; and the spacing between adjacent tin-conducting wires is adapted to the width of the soldering strip.
9. The solar cell according to claim 2, characterized in that: The surface of the solar cell further includes: centipede legs, the number of the centipede legs is multiple; The centipede legs are arranged on the plurality of fine grids between two adjacent welding pads along the direction of the welding pad that forms a second preset angle with the fine grid; The centipede leg is located on an extension line of the pad along a second preset angle with the fine grid.
10. A photovoltaic module, characterized in that: include: At least one battery string, the battery string comprising at least two solar cells according to any one of claims 1 to 9.
11. A photovoltaic system, characterized in that: The photovoltaic system comprises the photovoltaic assembly according to any one of claims 10.