A solar cell assembly and photovoltaic system

Abstract

The present application is applicable to the field of solar cell technology, and provides a solar cell assembly and a photovoltaic system. A battery string includes a plurality of battery cells, and the plurality of battery cells are distributed and arranged along a first direction, and the battery cell includes a first surface and a second surface opposite to each other; a plurality of first fine grids are arranged on the first surface of the battery cell, and a plurality of second fine grids are arranged on the second surface of the battery cell, and the first fine grids extend along the second direction; a plurality of first welding strips are arranged on the first surface of the battery cell, and a plurality of second welding strips are arranged on the second surface of the battery cell, and the first welding strips extend along the fourth direction, and the first welding strips of the first battery cell and the second welding strips of the second battery cell are directly or indirectly electrically connected; wherein the angle α between the second direction and the fourth direction is an acute angle. In this way, the contact area between the welding strip and the fine grid can be increased by tilting the welding strip and the fine grid at an acute angle. At the same time, the welding strip and the grid line almost overlap each other, thereby reducing the shading loss.

Description

Technical Field

[0001] This application belongs to the field of solar cell technology, and particularly relates to a solar cell module and a photovoltaic system. Background Technology

[0002] Currently, solar cells are semiconductor devices that directly convert sunlight energy into electrical energy, with metal grid lines used to collect and transmit current. However, in related technologies, the connection between solder ribbons and grid lines results in a small contact area, leading to high resistance and significant electrical losses. Both solder ribbons and grid lines contribute to shading losses, affecting the photoelectric conversion efficiency of the solar cell. Summary of the Invention

[0003] This application provides a solar cell module and a photovoltaic system, which aims to solve the problem that the solder ribbons are easily detached from the cells during the use of photovoltaic cells.

[0004] This application provides a solar cell module including a cell string, the cell string including a plurality of cells, the plurality of cells being distributed along a first direction, each cell including a first side and a second side facing away from each other, the plurality of cells including a first cell and an adjacent second cell; a plurality of first grids being disposed on the first side of the cells, a plurality of second grids being disposed on the second side of the cells, the first grids extending along a second direction and spaced apart along a third direction; a plurality of first solder strips being disposed on the first side of the cells, a plurality of second solder strips being disposed on the second side of the cells, the first solder strips extending along a fourth direction and spaced apart along the third direction, the first solder strips being electrically connected to the first grids, and the first solder strips of the first cells and the second solder strips of the second cells being directly or indirectly electrically connected;

[0005] The angle α between the second direction and the fourth direction is an acute angle.

[0006] In the solar cell module of this application embodiment, the cell string includes multiple cells distributed along a first direction. Each cell includes a first side and a second side facing away from each other. Each cell includes a first cell and adjacent second cells. A plurality of first grids are disposed on the first surface of the cells, and a plurality of second grids are disposed on the second surface of the cells. The first grids extend along a second direction and are spaced apart along a third direction. A plurality of first solder ribbons are disposed on the first surface of the cells, and a plurality of second solder ribbons are disposed on the second surface of the cells. The first solder ribbons extend along a fourth direction and are spaced apart along a third direction. The first solder ribbons are electrically connected to the first grids. The first solder ribbons of the first cells and the second solder ribbons of the second cells are directly or indirectly electrically connected. The angle α between the second and fourth directions is an acute angle. Thus, by setting the solder ribbons and grids at an acute angle, the contact area between the solder ribbons and the grids is increased, thereby reducing resistance and improving conductivity. Simultaneously, the solder ribbons and grid lines almost overlap, reducing shading loss and improving the photoelectric conversion efficiency of the solar cell module.

[0007] Furthermore, the first solder strip on the first side of the first battery cell and the second solder strip on the second side of the adjacent second battery cell are an integral continuous structure.

[0008] Furthermore, the second grid of the second cell extends along the fifth direction, the second solder strip extends along the sixth direction, and the second solder strip is electrically connected to the second grid at an intersection.

[0009] Furthermore, the angle β between the fifth direction and the sixth direction is an acute angle.

[0010] Furthermore, the second side of the second cell is provided with a plurality of main grids, and the second solder strip on the second side of the second cell is electrically connected to the main grids in a cross manner.

[0011] Furthermore, the first solder strip on the first side of the first battery cell and the second solder strip on the adjacent second side of the second battery cell are non-integral continuous structures, and the first solder strip and the second solder strip are electrically connected through a busbar.

[0012] Furthermore, the busbar connecting the first solder strip of the first battery cell and the second solder strip of the adjacent second battery cell is located between the first battery cell and the second battery cell.

[0013] Furthermore, the busbar connecting the first solder strip of the first battery cell and the second solder strip of the adjacent second battery cell is located on the second surface of the second battery cell.

[0014] Furthermore, the first solder strip of the first battery cell and the second solder strip of the second battery cell are connected to the same side or opposite side of the busbar.

[0015] Furthermore, the first solder strip of the first battery cell and the second solder strip of the second battery cell are electrically connected to the busbar through conductive adhesive or solder joints.

[0016] Furthermore, the first weld strip is a flat weld strip, a round weld strip, or a triangular weld strip, and the second weld strip is a flat weld strip, a round weld strip, or a triangular weld strip.

[0017] Furthermore, when the first surface is a light-receiving surface and the first solder strip is a round solder strip, the diameter of the round solder strip is 0.05mm-0.3mm.

[0018] Furthermore, when the first surface is a light-receiving surface and the first solder strip is a flat solder strip, the width of the flat solder strip along the third direction is 0.2mm-0.8mm.

[0019] Furthermore, when the first surface is a light-receiving surface and the first solder strip is a triangular solder strip, the width of the bottom edge of the triangular solder strip along the third direction is 0.05mm-0.5mm.

[0020] Furthermore, the angle α between the second direction and the fourth direction satisfies the following relationship: 0 < tanα < D / L;

[0021] Wherein, L is the total length of the farthest ends of the first and last battery cells in the battery string along the first direction, and D is the width of the battery cell along the third direction.

[0022] Furthermore, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0 < tanα < D / 50L.

[0023] Furthermore, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0 < tanα < D / 100L.

[0024] Furthermore, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0 < tanα < D / 150L.

[0025] Furthermore, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0 < tanα < D / 250L.

[0026] Furthermore, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tanβ < D / L;

[0027] Wherein, L is the total length of the battery string from the first battery cell to the farthest end of the last battery cell along the first direction, and D is the width of the battery cell along the third direction.

[0028] Furthermore, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tanβ < D / 50L.

[0029] Furthermore, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tanβ < D / 100L.

[0030] Furthermore, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tanβ < D / 150L.

[0031] Furthermore, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tanβ < D / 250L.

[0032] The photovoltaic system provided in this application includes the solar cell module described in any of the above embodiments.

[0033] In the solar cell module and photovoltaic system of this application embodiment, the cell string includes multiple cells distributed along a first direction. Each cell includes a first side and a second side facing away from each other. Each cell includes a first cell and adjacent second cells. A plurality of first grids are disposed on the first surface of the cells, and a plurality of second grids are disposed on the second surface of the cells. The first grids extend along a second direction and are spaced apart along a third direction. A plurality of first solder ribbons are disposed on the first surface of the cells, and a plurality of second solder ribbons are disposed on the second surface of the cells. The first solder ribbons extend along a fourth direction and are spaced apart along a third direction. The first solder ribbons are electrically connected to the first grids. The first solder ribbons of the first cells and the second solder ribbons of the second cells are directly or indirectly electrically connected. The angle α between the second and fourth directions is an acute angle. Thus, by setting the solder ribbons and grids at an acute angle, the contact area between the solder ribbons and grids is increased, thereby reducing resistance and improving conductivity. Simultaneously, the solder ribbons and grid lines almost overlap, reducing shading loss and improving the photoelectric conversion efficiency of the solar cell module. Attached Figure Description

[0034] Figure 1 This is a partial structural schematic diagram of a solar cell module according to an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of another part of the structure of a solar cell module according to an embodiment of this application;

[0036] Figure 3This is a schematic diagram of another part of the structure of a solar cell module according to an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of the modular structure of a solar cell module according to an embodiment of this application;

[0038] Figure 5 This is a partial structural schematic diagram of a solar cell module according to an embodiment of this application;

[0039] Figure 6 This is a partial structural schematic diagram of a solar cell module according to an embodiment of this application;

[0040] Figure 7 This is a partial structural schematic diagram of a solar cell module according to an embodiment of this application;

[0041] Figure 8 This is a partial structural schematic diagram of a solar cell module according to an embodiment of this application;

[0042] Figure 9 This is a partial structural schematic diagram of a solar cell module according to an embodiment of this application;

[0043] Figure 10 This is a partial structural schematic diagram of a solar cell module according to an embodiment of this application;

[0044] Figure 11 This is a partial structural schematic diagram of a solar cell module according to an embodiment of this application;

[0045] Figure 12 This is a partial structural schematic diagram of a solar cell module according to an embodiment of this application;

[0046] Figure 13 This is a schematic diagram of the module structure of a photovoltaic system according to an embodiment of this application.

[0047] Explanation of key component symbols:

[0048] Solar cell module 100, cell 10, first cell 101, second cell 102, first surface 11, second surface 12, first grid 13, second grid 14, main grid 15, first solder strip 21, second solder strip 22, busbar 30, cell string 200, photovoltaic system 300. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0050] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0055] In related technologies, a solar cell is a semiconductor device that directly converts the energy of sunlight into electrical energy. However, in existing technologies, the connection between the solder ribbon and the grid lines results in a small contact area, leading to high resistance and significant electrical losses. Both the solder ribbon and the grid lines contribute to shading losses, affecting the photoelectric conversion efficiency of the solar cell. In the embodiments of this application, the solder ribbon and the fine grid are inclined at an acute angle to increase the contact area, thereby reducing resistance and improving conductivity. Simultaneously, the solder ribbon and the grid lines almost overlap, reducing shading losses and improving the photoelectric conversion efficiency of the solar cell module.

[0056] Example 1

[0057] Please see Figures 1 to 4 This application provides a solar cell module 100 including a cell string 200, which includes multiple cells 10. The multiple cells 10 are distributed along a first direction, and each cell 10 includes a first surface 11 and a second surface 12 facing away from each other. Each cell 10 includes a first cell 101 and an adjacent second cell 102. A plurality of first grids 13 are disposed on the first surface 11 of the cell 10, and a plurality of second grids 14 are disposed on the second surface 12 of the cell 10. The first grids 13 extend along a second direction and are spaced apart along a third direction. A plurality of first solder ribbons 21 are disposed on the first surface 11 of the cell 10, and a plurality of second solder ribbons 22 are disposed on the second surface 12 of the cell 10. The first solder ribbons 21 extend along a fourth direction and are spaced apart along a third direction. The first solder ribbons 21 are electrically connected to the first grids 13, and the first solder ribbons 21 of the first cell 101 and the second solder ribbons 22 of the second cell 102 are directly or indirectly electrically connected. The included angle α between the second direction and the fourth direction is an acute angle.

[0058] In the solar cell module 100 of this application embodiment, the cell string 200 includes a plurality of cells 10, which are distributed along a first direction. Each cell 10 includes a first surface 11 and a second surface 12 facing away from each other. Each cell 10 includes a first cell 101 and an adjacent second cell 102. A plurality of first grids 13 are disposed on the first surface 11 of the cell 10, and a plurality of second grids 14 are disposed on the second surface 12 of the cell 10. The first grids 13 extend along a second direction and are spaced apart along a third direction. A plurality of first solder ribbons 21 are disposed on the first surface 11 of the cell 10, and a plurality of second solder ribbons 22 are disposed on the second surface 12 of the cell 10. The first solder ribbons 21 extend along a fourth direction and are spaced apart along a third direction. The first solder ribbons 21 are electrically connected to the first grids 13. The first solder ribbons 21 of the first cell 101 and the second solder ribbons 22 of the second cell 102 are directly or indirectly electrically connected. The included angle α between the second direction and the fourth direction is an acute angle. In this way, by setting the solder ribbon and the grid at an acute angle, the contact area between the solder ribbon and the grid can be increased, thereby reducing resistance and improving conductivity. At the same time, the solder ribbon and the grid lines almost overlap, reducing shading loss and improving the photoelectric conversion efficiency of the solar cell module 100.

[0059] In this embodiment, the first surface 11 of the solar cell 10 is used to receive light, and the second surface 12 of the solar cell 10 is the back surface. The first doped layer and the second doped layer of the solar cell 10 can be respectively disposed on the first surface 11 and the second surface 12. The first surface 11 of the first solar cell 101 is connected to the second surface 12 of the second solar cell 102 via a first solder strip 21 and a second solder strip 22; that is, the first doped layer of the first solar cell 101 can be connected to the second doped layer of the second solar cell 102. Simultaneously, the first doped layer of the second solar cell 102 is connected to the second doped layer of another adjacent solar cell 10, and so on, to form a battery string 200 distributed along the first direction. Of course, in some embodiments, the solder strips located at the ends of the battery string 200 can only connect to one doped layer and extend relative to the solar cell 10 to connect to structures such as busbars to achieve current extraction.

[0060] It is understood that in the battery string 200, the battery string 200 may include two battery cells 10 connected in series, three battery cells 10 connected in series, or a greater number of battery cells 10, the specific number of battery cells 10 to be connected in series can be determined according to the actual use. In addition, in this embodiment of the application, the size and type of the battery cells 10 are not limited, and the specifications and sizes of adjacent battery cells 10 can be the same or different to meet different needs.

[0061] It should be noted that "first" and "second" in the context of the first solar cell 101 and the second solar cell 102 are relative concepts, indicating that the two solar cells 10 are different. For example, in Figure 1 In the example, the battery cell 10 on the left is labeled as the first battery cell 101, and the battery cell 10 on the right is labeled as the second battery cell 102.

[0062] In this application, the specific arrangement of adjacent solar cells 10 is not limited to meet different needs. For example, in one embodiment, two adjacent solar cells 10 can be arranged at intervals. The spacing between two adjacent solar cells 10 is within a suitable range, which can avoid the small operating space and high welding difficulty caused by too small a spacing, and also avoid the waste of component space and increased cost caused by too large a spacing.

[0063] In the embodiments of this application, the doping type of the first doped layer and the second doped layer is not limited. For example, the first doped layer and the second doped layer can be P-type doped layer and N-type doped layer, respectively; or the first doped layer can be N-type doped layer and the second doped layer can be P-type doped layer, as long as the polarities of the two are opposite, to meet different requirements.

[0064] In some embodiments, the first doped layer may be a P-type polycrystalline silicon layer, a P-type amorphous silicon layer, or a P-type microcrystalline silicon layer, and there is no specific limitation. Similarly, the second doped layer may be an N-type polycrystalline silicon layer, an N-type amorphous silicon layer, or an N-type microcrystalline silicon layer, and there is no specific limitation. When the first doped layer is a P-type doped layer and the second doped layer is an N-type doped layer, a P-type gate line may also be provided on the first doped layer, and an N-type gate line may also be provided on the second doped layer, and there is no specific limitation. In this embodiment, the first solder ribbon 21 is connected to the first doped layer through a P-type gate line, and the second solder ribbon 22 is connected to the second doped layer through an N-type gate line.

[0065] In some embodiments, P-type doping refers to doping with group III elements, including boron, aluminum, gallium, indium, thallium, etc.; N-type doping refers to doping with group V elements, including nitrogen, phosphorus, arsenic, antimony, bismuth, etc., and the specific doping is not limited here.

[0066] In some embodiments, the first and second doped layers can also be composite doped layers; for example, N-type doping also includes a small amount of P-type doping elements. The N-type doping element content in the second doped layer is higher than 20% of the P-type doping element content to ensure that its polarity is opposite to that of the first doped layer.

[0067] For example, the first fine gate 13 can be the positive electrode and the second fine gate 14 can be the negative electrode. Of course, in other embodiments, the opposite can be true, that is, the first fine gate 13 can be the negative electrode and the second fine gate 14 can be the positive electrode, and the specifics are not limited here.

[0068] In the solar cell module 100 of the present application embodiment, the first direction and the third direction can be vertical. In this case, the cell 10 can be rectangular, and the first direction and the third direction are also the edge directions of the cell 10, so as to maximize the utilization of the area of ​​the cell 10.

[0069] Specifically, the angle between the second and fourth directions is an acute angle. By tilting the first solder strip 21 and the first fine grid 13 at an acute angle, the contact area between the first solder strip 21 and the first fine grid 13 is significantly increased, thereby improving the electrical contact area and enhancing conductivity. Simultaneously, the tilted design of the first solder strip 21 and the first fine grid 13 effectively alleviates stress concentration problems, ensuring the stability of the connection between the first solder strip 21 and the first fine grid 13, and reducing connection failures caused by mechanical stress or temperature changes. The robust connection between the first solder strip 21 and the first fine grid 13 ensures a stable electrical connection between the solar cells 10, improving the reliability and lifespan of the solar cell module 100.

[0070] In the solar cell module 100 of this application embodiment, actively setting the first solder strip 21 and the first grid 13 at an acute angle can reduce the manufacturing difficulty of the solar cell module 100, reduce the alignment requirements during the welding process, improve the fault tolerance and accuracy of welding, and reduce manufacturing complexity. The inclined setting method is easier to operate with automated equipment, improves production efficiency, reduces manual intervention, and lowers production costs. The acute-angled design of the first solder strip 21 and the first grid 13 helps to disperse mechanical stress, reduce stress concentration at the welding point, and improve the reliability and durability of the welding point.

[0071] Furthermore, in the solar cell module 100 of this application embodiment, the first direction can be arranged perpendicular to the third direction, that is, multiple first solder ribbons 21 are arranged in parallel, and the number of first solder ribbons 21 is the same as the number of first grids 13. The spacing between different first solder ribbons 21 can be the same as the spacing between different first grids 13, so that each first solder ribbon 21 can cover the corresponding first grid 13. In this way, the first solder ribbons 21 and the first grids 13 almost overlap, reducing shading loss and improving the photoelectric conversion efficiency of the solar cell module 100.

[0072] It is understood that in such embodiments, the solar cell module 100 may further include a frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film may be filled between the first surface 11 and the second surface 12 of the solar cell 10, the photovoltaic glass, adjacent solar cells 10, etc. As a filler, it may be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulating film may be an EVA film or a POE film, and the specific choice can be made according to the actual situation, without limitation.

[0073] Photovoltaic glass can be applied to the encapsulant film on the first side 11 of the solar cell 10. The photovoltaic glass can be ultra-clear glass, which has high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, ultra-clear glass can have a light transmittance of over 92%, protecting the solar cell 10 while minimizing impact on its efficiency. Simultaneously, the encapsulant film bonds the photovoltaic glass and the solar cell 10 together, providing sealing, insulation, waterproofing, and moisture protection for the solar cell 10.

[0074] The backsheet can be attached to the adhesive film on the second side 12 of the solar cell 10. The backsheet provides protection and support for the solar cell 10, and has reliable insulation, water resistance, and aging resistance. Multiple options are available for the backsheet, typically tempered glass, acrylic glass, aluminum alloy TPT composite adhesive film, etc., and the specific choice depends on the specific circumstances and is not limited here. The backsheet, solar cell 10, adhesive film, and photovoltaic glass can be integrated into a frame. The frame serves as the main external support structure for the entire solar cell module 100, providing stable support and installation for the solar cell module 100. For example, the solar cell module 100 can be installed at the desired location via the frame.

[0075] Furthermore, the spacing between adjacent first grids 13 and adjacent second grids 14 can be flexibly adjusted according to actual needs. The first grids 13 and second grids 14 can be equally spaced, which ensures uniform current distribution and improves the overall efficiency of the solar cell module 100. Non-equal spacing can optimize the current conduction path for specific application scenarios, reducing problems such as localized overheating or excessive resistance. A combination of partially equal and partially non-equal spacing combines the advantages of both, allowing for flexible adjustments according to specific needs and optimizing the performance of the solar cell module 100.

[0076] Furthermore, the first fine grid 13, the second fine grid 14, the first solder strip 21, and the second solder strip 22 are all arranged in parallel. This makes the battery cell 10 more regular, with multiple solder strips arranged parallel on the battery cell 10 and evenly distributed along a third direction, ensuring consistent spacing between the solder strips and forming a regular layout. It also allows the solder strips to be aligned with the grid lines.

[0077] Example 2

[0078] Please see Figures 1 to 3 In some alternative embodiments, the first solder strip 21 of the first surface 11 of the first battery cell 101 and the second solder strip 22 of the second surface 12 of the adjacent second battery cell 102 are integral continuous structures.

[0079] Thus, the first solder strip 21 on the first surface 11 of the first battery cell 101 and the second solder strip 22 on the second surface 12 of the adjacent second battery cell 102 are an integral continuous structure, which can ensure the conductivity continuity of the battery string 200.

[0080] Specifically, the first solder strip 21 can extend in the same direction as the second solder strip 22 of the adjacent battery cell 10. That is, at this time, the second solder strip 22 of the second surface 12 of the second battery cell 102 extends in the same direction as the first solder strip 21 of the first battery cell 101.

[0081] Example 3

[0082] Please see Figure 3 and Figure 5 In some alternative embodiments, the second grid 14 of the second cell 102 extends along the fifth direction, the second solder strip 22 extends along the sixth direction, and the second solder strip 22 is electrically connected to the second grid 14 at an intersection.

[0083] Thus, the second grid 14 of the second solar cell 102 extends along the fifth direction and can be spaced apart along the third direction; the second solder strip 22 extends along the sixth direction and can be spaced apart along the third direction. The second solder strip 22 is cross-electrically connected to the second grid 14, so that the second grid 14 can conduct the current of the second doped layer to the second solder strip 22.

[0084] In this embodiment, the fifth and sixth directions are not limited to meet different needs. For example, the fifth direction can be perpendicular to the sixth direction, and the sixth direction can be consistent with the fourth direction, so that each first solder strip 21 can be correspondingly set with the second solder strip 22 of the adjacent battery cell 10, ensuring a stable connection between the first solder strip 21 and the second solder strip 22. Of course, the fifth direction can also be consistent with a third direction.

[0085] Example 4

[0086] Please see Figure 5 and Figure 6 In some alternative embodiments, the included angle β between the fifth direction and the sixth direction is an acute angle.

[0087] Thus, the second solder strip 22 and the second fine grid 14 are arranged approximately in parallel, with each second fine grid 14 corresponding to one second solder strip 22, and the second solder strip 22 can be covered on the second fine grid 14.

[0088] Example 5

[0089] Please see Figure 7 In some alternative embodiments, the second surface 12 of the second cell 102 is provided with a plurality of main grids 15, and the second solder strip 22 of the second surface 12 of the second cell 102 is electrically connected to the main grids 15 in a cross manner.

[0090] Thus, the second fine grid 14 can be arranged intersecting with the main grid 15, and the second solder strip 22 can be electrically connected to the main grid 15. At this time, the second fine grid 14 and the second solder strip 22 can be arranged parallel to each other or at an acute angle.

[0091] Example 6

[0092] Please see Figure 5 and Figure 6 In some optional embodiments, the first solder strip 21 on the first surface 11 of the first battery cell 101 and the second solder strip 22 on the second surface 12 of the adjacent second battery cell 102 are non-integral continuous structures, and the first solder strip 21 and the second solder strip 22 are electrically connected through the busbar 30.

[0093] Thus, the first solder strip 21 on the first surface 11 of the first battery cell 101 and the second solder strip 22 on the second surface 12 of the adjacent second battery cell 102 are disconnected, but can be connected together in other directions such as through the busbar 30.

[0094] Specifically, in the fabrication process of the battery string 200, the first solder ribbon 21 can cover the first grid 13 of multiple battery cells 10 in a straight line along the fourth direction in one go, and the second solder ribbon 22 can cover the second grid 14 of multiple battery cells 10 in a straight line along the sixth direction in one go. Then, the first solder ribbon 21 and the second solder ribbon 22 between adjacent battery cells 10 are cut off, and finally, the first solder ribbon 21 of the first battery cell 101 and the second solder ribbon 22 of the second battery cell 102 are electrically connected together. This improves welding efficiency, reduces welding steps and time, and is suitable for mass production. The design of attaching the solder ribbon to the grid line at a certain angle facilitates the operation of automated equipment and improves the accuracy and consistency of production. The connection between the solder ribbon and the grid line increases the mechanical strength and stability of the solar cell module 100 and extends its service life.

[0095] For example, during the manufacturing process, a solder ribbon can be simultaneously placed on the same straight grid line of multiple solar cells 10, and then can be broken at a predetermined position to ensure that the solder ribbon can connect the first grid 13 and the second grid 14 of adjacent solar cells 10. The first solder ribbon 21 and the second solder ribbon 22 are respectively close to the protruding solar cells 10, and then electrically connected in the gap between the first solar cell 101 and the second solar cell 102 or on the second surface 12 of the second solar cell 102.

[0096] Example 7

[0097] Please see Figure 5 and Figure 6In some alternative embodiments, a busbar 30 connecting the first solder strip 21 of the first battery cell 101 and the second solder strip 22 of the adjacent second battery cell 102 is located between the first battery cell 101 and the second battery cell 102.

[0098] Thus, the busbar 30 is located between the first battery cell 101 and the second battery cell 102, which facilitates the fabrication of the battery string 200 and simplifies the fabrication process.

[0099] Example 8

[0100] Please see Figures 8 to 12 In some alternative embodiments, the busbar 30 connecting the first solder strip 21 of the first battery cell 101 and the second solder strip 22 of the adjacent second battery cell 102 is located on the second surface 12 of the second battery cell 102.

[0101] In this way, the space occupied by the busbar 30 in the solar cell module 100 can be reduced, thereby reducing the gap between adjacent cells 10 and increasing the light-receiving area of ​​the solar cell module 100.

[0102] Example 9

[0103] Please see Figure 8 and Figure 12 In some alternative embodiments, the first solder strip 21 of the first battery cell 101 and the second solder strip 22 of the second battery cell 102 are connected to the same side or opposite side of the busbar 30.

[0104] In this embodiment, the relative positions of the first solder strip 21 and the second solder strip 22 connected to the busbar 30 are not limited to meet different requirements. In one example, the first solder strip 21 of the first battery cell 101 and the second solder strip 22 of the second battery cell 102 are connected to the same side of the busbar 30. In this case, both the first solder strip 21 and the second solder strip 22 are located on the side of the busbar 30 away from the first surface 11, or both the first solder strip 21 and the second solder strip 22 are located on the side of the busbar 30 close to the first surface 11. In another example, the first solder strip 21 of the first battery cell 101 and the second solder strip 22 of the second battery cell 102 are connected to opposite sides of the busbar 30. In this case, the first solder strip 21 is located on the side of the busbar 30 away from the first surface 11, and both the second solder strips 22 are located on the side of the busbar 30 close to the first surface 11; or the first solder strip 21 is located on the side of the busbar 30 close to the first surface 11, and both the second solder strips 22 are located on the side of the busbar 30 away from the first surface 11.

[0105] Example 10

[0106] Please see Figure 1 and Figure 2In some alternative embodiments, the first solder strip 21 of the first battery cell 101 and the second solder strip 22 of the second battery cell 102 are electrically connected to the busbar 30 through conductive adhesive or solder joints.

[0107] In this way, the conductive adhesive or solder joint can ensure a stable connection between the solder strip and the busbar 30.

[0108] Example 11

[0109] Please see Figure 1 and Figure 2 In some alternative embodiments, the first solder strip 21 is a flat solder strip, a round solder strip, or a triangular solder strip, and the second solder strip 22 is a flat solder strip, a round solder strip, or a triangular solder strip.

[0110] In this application embodiment, the specific form of the first solder strip 21 and the second solder strip 22 is not limited to meet different needs. Preferably, the first solder strip 21 and the second solder strip 22 can be round solder strips or triangular solder strips to reduce shading and improve the bifaciality of the solar cell module 100%.

[0111] Example 12

[0112] Please see Figure 1 and Figure 2 In some optional embodiments, when the first surface 11 is a light-receiving surface and the first solder strip 21 is a round solder strip, the diameter of the round solder strip is 0.05mm-0.3mm. For example, the diameter of the round solder strip can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, or 0.3mm.

[0113] Example 13

[0114] Please see Figure 1 and Figure 2 In some optional embodiments, when the first surface 11 is a light-receiving surface and the first solder strip 21 is a round solder strip, the width of the flat solder strip along the third direction is 0.2mm-0.8mm. For example, the width of the flat solder strip along the third direction can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, or 0.8mm.

[0115] Example 14

[0116] Please see Figure 1 and Figure 2In some optional embodiments, when the first surface 11 is a light-receiving surface and the first solder strip 21 is a round solder strip, the width of the bottom edge of the triangular solder strip along the third direction is 0.05mm-0.5mm. For example, the width of the bottom edge of the triangular solder strip along the third direction can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, or 0.5mm.

[0117] Specifically, the width of the solder strip along the third direction is set within this range, which can ensure the stable connection between the solder strip and the grid, and avoid blocking the light, thereby improving the bifaciality of the solar cell module 100.

[0118] Example 15

[0119] Please see Figure 1 and Figure 2 In some alternative embodiments, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0 < tanα < D / L;

[0120] Where L is the total length of the farthest ends of the first and last battery cells 10 in the battery string 200 along the first direction, and D is the width of the battery cell 10 along the third direction.

[0121] Thus, the tilt angle of the first solder strip 21 can be determined based on the length of the battery string 200. The angle can be adjusted for battery strings 200 of different lengths and types, so that one first solder strip 21 can completely cover the doped layer on the same straight line of multiple battery cells 10. This facilitates the fabrication process, where multiple battery cells 10 are connected in series with the first solder strip 21, and then selectively cut by laser to form battery strings 200 in pairs.

[0122] Specifically, the tilt angle of the first solder strip 21 is flexibly adjusted according to the length of the battery string 200 and the width of the grid lines to adapt to the specific needs of different battery strings 200, ensuring that the first solder strip 21 can completely cover the first fine grid 13. D is the width of the battery cell 10 along a third direction. That is, the first surface 11 of the first battery cell 101 can be provided with only one first fine grid 13, and both the first fine grid 13 and the first solder strip 21 are arranged along the diagonal direction of the first battery cell 101. Obviously, this is an extreme arrangement, and other arrangements are possible in other embodiments. Of course, the second solder strip 22 and the second fine grid 14 can also have a similar arrangement, which is not limited here.

[0123] Specifically, a single weld can completely cover the doped layers of multiple solar cells 10 on the production line, simplifying the welding process, reducing welding steps, and improving production efficiency. After multiple solar cells 10 are connected in series by the weld ribbon, they are selectively sheared by laser to form pairs of solar cell strings 200. This method is efficient and precise, reducing the complexity of the production process.

[0124] For example, the battery string 200 can be composed of nine battery cells 10 evenly distributed along a first direction, where L is the distance between the farthest ends of the nine battery cells 10. Based on this length and the width D of the battery cells 10 along a third direction, an inclination angle α is calculated, allowing the solder strip to be tilted at an angle α.

[0125] In this embodiment, the range of the included angle α between the second and fourth directions is not limited to meet different requirements. This allows for adjustment based on the length of different battery strings 200 and the number of fine grids.

[0126] Example 16

[0127] Please see Figure 1 and Figure 2 In some alternative embodiments, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0 < tanα < D / 50L.

[0128] Thus, 50 first fine grids 13 can be set on the first surface 11. The 50 first fine grids 13 are set at equal intervals to divide the width of the battery cell 10 along the third direction. Each first solder strip 21 corresponds to one first fine grid 13. At this time, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0<tanα<D / 50L.

[0129] Example 17

[0130] Please see Figure 1 and Figure 2 In some alternative embodiments, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0 < tanα < D / 100L.

[0131] Thus, 100 first fine grids 13 can be set on the first surface 11. The 100 first fine grids 13 are set at equal intervals to divide the width of the battery cell 10 along the third direction. Each first solder strip 21 corresponds to one first fine grid 13. At this time, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0<tanα<D / 100L.

[0132] Example 18

[0133] Please see Figure 1 and Figure 2In some alternative embodiments, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0 < tanα < D / 150L.

[0134] Thus, 150 first fine grids 13 can be set on the first surface 11. The 150 first fine grids 13 are set at equal intervals to divide the width of the battery cell 10 along the third direction. Each first solder strip 21 corresponds to one first fine grid 13. At this time, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0<tanα<D / 150L.

[0135] Example 19

[0136] Please see Figure 1 and Figure 2 In some alternative embodiments, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0 < tanα < D / 250L.

[0137] Thus, 250 first fine grids 13 can be set on the first surface 11. The 250 first fine grids 13 are set at equal intervals to divide the width of the battery cell 10 along the third direction. Each first solder strip 21 corresponds to one first fine grid 13. At this time, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0<tanα<D / 250L.

[0138] Example 20

[0139] Please see Figure 5 and Figure 6 In some alternative embodiments, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tanβ < D / L;

[0140] Where L is the total length of the battery string 200 from the first battery cell 10 to the farthest end of the last battery cell 10 along the first direction, and D is the width of the battery cell 10 along the third direction.

[0141] Thus, the tilt angle of the second solder strip 22 can be determined based on the length of the battery string 200. The angle can be adjusted for battery strings 200 of different lengths and types, so that one second solder strip 22 can completely cover the doped layer on the same straight line of multiple battery cells 10. This facilitates the fabrication process, where multiple battery cells 10 are connected in series by the second solder strip 22, and then selectively cut by laser to form battery strings 200 in pairs.

[0142] Example 21

[0143] Please see Figure 5 and Figure 6 In some alternative embodiments, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tanβ < D / 50L.

[0144] Thus, 50 second fine grids 14 can be set on the second surface 12. The 50 second fine grids 14 are set at equal intervals to divide the width of the cell 10 along the third direction. Each second solder strip 22 corresponds to one second fine grid 14. At this time, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0<tanβ<D / 50L.

[0145] Example 22

[0146] Please see Figure 5 and Figure 6 In some alternative embodiments, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tanβ < D / 100L.

[0147] Thus, 100 second fine grids 14 can be set on the second surface 12. The 100 second fine grids 14 are set at equal intervals to divide the width of the cell 10 along the third direction. Each second solder strip 22 corresponds to one second fine grid 14. At this time, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0<tanβ<D / 100L.

[0148] Example 23

[0149] Please see Figure 5 and Figure 6 In some alternative embodiments, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tanβ < D / 150L.

[0150] Thus, 150 second fine grids 14 can be set on the second surface 12. The 150 second fine grids 14 are set at equal intervals to divide the width of the cell 10 along the third direction. Each second solder strip 22 corresponds to one second fine grid 14. At this time, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0<tanβ<D / 150L.

[0151] Example 24

[0152] Please see Figure 5 and Figure 6 In some alternative embodiments, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tanβ < D / 250L.

[0153] Thus, 250 second fine grids 14 can be set on the second surface 12. The 250 second fine grids 14 are set at equal intervals to divide the width of the cell 10 along the third direction. Each second solder strip 22 corresponds to one second fine grid 14. At this time, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0<tanβ<D / 250L.

[0154] Example 25

[0155] Please see Figure 1 and Figure 13 The photovoltaic system 300 provided in this application includes the solar cell module 100 of any of the above embodiments.

[0156] In the solar cell module 100 and photovoltaic system 300 of the embodiments of this application, the cell string 200 includes a plurality of cells 10, which are distributed along a first direction. Each cell 10 includes a first surface 11 and a second surface 12 facing away from each other. Each cell 10 includes a first cell 101 and a second cell 102 arranged adjacent to each other. A plurality of first grids 13 are disposed on the first surface 11 and a plurality of second grids 14 are disposed on the second surface 12. The first grids 13 extend along a second direction and are spaced apart along a third direction. A plurality of first solder strips 21 are disposed on the first surface 11 and a plurality of second solder strips 22 are disposed on the second surface 12. The first solder strips 21 extend along a fourth direction and are spaced apart along a third direction. The first solder strips 21 are electrically connected to the first grids 13. The first solder strips 21 of the first cell 101 and the second solder strips 22 of the second cell 102 are directly or indirectly electrically connected. The included angle α between the second direction and the fourth direction is an acute angle. In this way, by setting the solder ribbon and the grid at an acute angle, the contact area between the solder ribbon and the grid can be increased, thereby reducing resistance and improving conductivity. At the same time, the solder ribbon and the grid lines almost overlap, reducing shading loss and improving the photoelectric conversion efficiency of the solar cell module 100.

[0157] In this embodiment, the photovoltaic system 300 can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy for power generation, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system 300 are not limited to these; that is, the photovoltaic system 300 can be applied in all fields that require solar energy for power generation. Taking a photovoltaic power generation system grid as an example, the photovoltaic system 300 may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple solar cell modules 100. For example, multiple solar cell modules 100 can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0158] In the description of this specification, the references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0159] Furthermore, the above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A solar cell assembly, characterized in that: The invention comprises a battery string, wherein the battery string comprises a plurality of battery cells, the plurality of battery cells are distributed along a first direction, the battery cells comprise a first surface and a second surface opposite to each other, and the plurality of battery cells comprise a first battery cell and a second battery cell arranged adjacent to each other; a plurality of first fine grids are arranged on the first surface of the battery cell, a plurality of second fine grids are arranged on the second surface of the battery cell, the first fine grids extend along a second direction, and the first fine grids are arranged at intervals along a third direction; a plurality of first welding strips are arranged on the first surface of the battery cell, a plurality of second welding strips are arranged on the second surface of the battery cell, the first welding strips extend along a fourth direction and are arranged at intervals along the third direction, the first welding strips are electrically connected to the first fine grids, and the first welding strips of the first battery cell and the second welding strips of the second battery cell are directly or indirectly electrically connected; The number of the first welding strips is consistent with the number of the first fine grids, each of the first welding strips covers one of the first fine grids, and the angle α between the second direction and the fourth direction is an acute angle.

2. The solar cell assembly according to claim 1, characterized in that: The first welding strip on the first side of the first battery cell and the second welding strip on the second side of the adjacent second battery cell are an integral continuous structure.

3. The solar cell assembly according to claim 2, characterized in that: The second fine grid of the second battery cell extends along a fifth direction, the second welding strip extends along a sixth direction, and the second welding strip is cross-electrically connected to the second fine grid.

4. The solar cell assembly according to claim 3, characterized in that: An angle β between the fifth direction and the sixth direction is an acute angle.

5. The solar cell assembly according to claim 2, characterized in that: A plurality of main grids are disposed on the second surface of the second battery cell, and a second welding strip on the second surface of the second battery cell is cross-electrically connected to the main grids.

6. The solar cell assembly according to claim 1, characterized in that: The first welding strip on the first side of the first battery cell and the second welding strip on the second side of the adjacent second battery cell are non-integrated continuous structures, and the first welding strip and the second welding strip are electrically connected via a busbar.

7. The solar cell assembly according to claim 6, characterized in that: A busbar connecting the first welding ribbon of the first battery cell and the second welding ribbon of the adjacent second battery cell is located between the first battery cell and the second battery cell.

8. The solar cell assembly according to claim 6, characterized in that: The busbar connecting the first welding ribbon of the first battery cell and the second welding ribbon of the adjacent second battery cell is located on the second surface of the second battery cell.

9. The solar cell assembly according to claim 6, characterized in that: The first welding ribbon of the first battery cell and the second welding ribbon of the second battery cell are connected to the same surface or opposite surfaces of the busbar.

10. The solar cell assembly according to claim 6, characterized in that: The first welding strip of the first battery cell and the second welding strip of the second battery cell are electrically connected to the busbar through conductive glue or welding points.

11. The solar cell assembly according to claim 1, characterized in that: The first welding strip is a flat welding strip, a round welding strip, or a triangular welding strip, and the second welding strip is a flat welding strip, a round welding strip, or a triangular welding strip.

12. The solar cell assembly according to claim 11, characterized in that: The first surface is a light-receiving surface. When the first welding strip is a round welding strip, the diameter of the round welding strip is 0.05 mm-0.3 mm.

13. The solar cell assembly according to claim 11, characterized in that: The first surface is a light-receiving surface. When the first welding strip is a flat welding strip, the width of the flat welding strip along the third direction is 0.2 mm-0.8 mm.

14. The solar cell assembly according to claim 11, characterized in that: The first surface is a light-receiving surface. When the first welding strip is a triangular welding strip, the width of the bottom edge of the triangular welding strip along the third direction is 0.05 mm-0.5 mm.

15. The solar cell assembly according to claim 1, characterized in that: The angle α between the second direction and the fourth direction satisfies the following relationship: 0<tanα<D / L; Wherein, L is the total length of the farthest ends of the first battery cell and the last battery cell in the battery string along the first direction, and D is the width of the battery cell along the third direction.

16. The solar cell assembly according to claim 15, characterized in that: The angle α between the second direction and the fourth direction satisfies the following relationship: 0<tanα<D / 50L.

17. The solar cell assembly according to claim 15, characterized in that: The angle α between the second direction and the fourth direction satisfies the following relationship: 0<tanα<D / 100L.

18. The solar cell assembly according to claim 15, characterized in that: The angle α between the second direction and the fourth direction satisfies the following relationship: 0<tanα<D / 150L.

19. The solar cell assembly according to claim 15, characterized in that: The angle α between the second direction and the fourth direction satisfies the following relationship: 0<tanα<D / 250L.

20. The solar cell assembly according to claim 4, characterized in that: The angle β between the fifth direction and the sixth direction satisfies the following relationship: 0<tanβ<D / L; Wherein, L is the total length from the first battery cell to the farthest end of the last battery cell in the battery string along the first direction, and D is the width of the battery cell along the third direction.

21. The solar cell assembly according to claim 20, characterized in that: The angle β between the fifth direction and the sixth direction satisfies the following relationship: 0<tanβ<D / 50L.

22. The solar cell assembly according to claim 20, characterized in that: The angle β between the fifth direction and the sixth direction satisfies the following relationship: 0<tanβ<D / 100L.

23. The solar cell assembly according to claim 20, characterized in that: The angle β between the fifth direction and the sixth direction satisfies the following relationship: 0<tanβ<D / 150L.

24. The solar cell assembly according to claim 20, characterized in that: The angle β between the fifth direction and the sixth direction satisfies the following relationship: 0<tanβ<D / 250L.

25. A photovoltaic system, characterized in that: Comprising the solar cell assembly as described in any one of claims 1-24.

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