Solar cell, cell assembly and photovoltaic system

Abstract

The utility model is suitable for the technical field of solar cells, and provides a solar cell, a cell module and a photovoltaic system. The battery string comprises a plurality of battery pieces, the battery pieces are distributed in the first direction, the fine grids are arranged on the battery pieces, the conductive connection structures are arranged on the battery pieces and comprise first conductive connection structures and second conductive connection structures, the first conductive connection structures are arranged at the ends of the first fine grids, and the second conductive connection structures are arranged at the ends of the second fine grids. The second conductive connection structure is arranged at the end part of the second fine grid, the welding strip covers or partially covers the first fine grid and the second fine grid, and the included angle between the first direction and the third direction is an acute angle. Therefore, the welding strips and the fine grids are obliquely arranged at the acute angles, so that the connection force between the welding strips and the fine grids is increased, and stable connection is ensured. Meanwhile, the arrangement of the conductive connection structure can further increase the contact area with the solder strip, thereby relieving the problem of stress concentration, and guaranteeing the stable connection between the solder strip and the battery piece.

Description

Technical Field

[0001] The present application belongs to the technical field of solar cells, and in particular relates to a solar cell, a battery assembly and a photovoltaic system. Background Art

[0002] Solar cells are semiconductor devices that convert sunlight into electricity. Solar cells utilize the photovoltaic effect, absorbing photons to excite electrons, which are then channeled through an internal electric field to generate an electric current. Grid lines collect and transmit this current, converting light energy into electricity. However, in related technologies, stress concentration is prone to occur at the junction between the grid lines and the soldering ribbons, often leading to disconnection between the ribbons and the grid lines during soldering or lamination. Utility Model Content

[0003] The present application provides a solar cell, a battery module and a photovoltaic system, aiming to solve the problem of separation between the welding ribbon and the grid line of the photovoltaic cell during use.

[0004] The present application provides a solar cell, the solar cell comprising a cell string, a plurality of fine grids, a conductive connection structure and a plurality of welding strips, the cell string comprising a plurality of cell sheets, the plurality of cell sheets being distributed and arranged along a first direction, the plurality of fine grids being arranged on the cell sheets, the fine grids comprising a plurality of first fine grids and a plurality of second fine grids, the first fine grids and the second fine grids extending along the first direction and alternately arranged along the second direction, the first fine grids and the second fine grids having opposite grid properties, the conductive connection structure being arranged on the cell sheets, the conductive connection structure comprising a first conductive connection structure and a second conductive connection structure, the first conductive connection structure being arranged at an end of the first fine grid and / or the second conductive connection structure The structure is arranged at the end of the second fine grid, and the several welding strips are arranged on the battery cell, the welding strips extend along the third direction and are arranged at intervals along the second direction, the welding strips cover or partially cover the first fine grid and the second fine grid, and are conductively connected to the first fine grid and the second fine grid, there is at least one welding strip covering or partially covering the first fine grid and the first conductive connection structure, and is electrically connected to the first fine grid and the first conductive connection structure, there is at least one welding strip covering or partially covering the second fine grid and the second conductive connection structure, and is electrically connected to the second fine grid and the second conductive connection structure, wherein the angle between the first direction and the third direction is an acute angle.

[0005] In the solar cell of the embodiment of the present application, the solar cell includes a cell string, a plurality of fine grids, a conductive connection structure and a plurality of welding strips, the cell string includes a plurality of cell sheets, the plurality of cell sheets are distributed and arranged along a first direction, the plurality of fine grids are arranged on the cell sheets, the fine grids include a plurality of first fine grids and a plurality of second fine grids, the first fine grids and the second fine grids extend along the first direction and are alternately arranged along the second direction, the first fine grids and the second fine grids have opposite grid properties, the conductive connection structure is arranged on the cell sheet, the conductive connection structure includes a first conductive connection structure and a second conductive connection structure, the first conductive connection structure is arranged at the end of the first fine grid and / or A second conductive connection structure is provided at the end of the second fine grid. Several welding ribbons are provided on the cell. The welding ribbons extend along the third direction and are spaced apart along the second direction. The welding ribbons cover or partially cover the first fine grid and the second fine grid and are electrically connected to the first and second fine grids. At least one welding ribbon covers or partially covers the first fine grid and the first conductive connection structure and is electrically connected to the first fine grid and the first conductive connection structure. At least one welding ribbon covers or partially covers the second fine grid and the second conductive connection structure and is electrically connected to the second fine grid and the second conductive connection structure. The angle between the first direction and the third direction is an acute angle. In this way, by tilting the welding ribbons at an acute angle to the fine grid, the connection force between the welding ribbons and the fine grid is increased, ensuring a stable connection. At the same time, the provision of the conductive connection structure can further increase the contact area with the welding ribbons, thereby alleviating the problem of stress concentration and ensuring a stable connection between the welding ribbons and the cell.

[0006] Furthermore, the battery cell includes a first battery cell and a second battery cell, the first fine grid of the first battery cell and the second fine grid of the second battery cell are arranged in a one-to-one correspondence, and the welding ribbon includes a first welding ribbon and a second welding ribbon, the first welding ribbon connects the first fine grid and the first conductive connection structure of the first battery cell and the second fine grid and the second conductive connection structure of the second battery cell, and the second welding ribbon connects the first fine grid and the first conductive connection structure of the second battery cell and the part to be connected.

[0007] Furthermore, the component to be connected is the second fine grid or bus bar of another adjacent first battery cell.

[0008] Furthermore, in the second direction, a distance between adjacent first conductive connection structures and second conductive connection structures is 50 μm-400 μm.

[0009] Furthermore, the battery cell includes a middle area and four edge areas surrounding the middle area;

[0010] The area of ​​the conductive connection structure located in the edge region is larger than the area of ​​the conductive connection structure in the middle region.

[0011] Furthermore, the edge region includes a first edge region and a second edge region along the first direction, and the edge region also includes a third edge region and a fourth edge region along the second direction, an overlapping area between the first edge region and the third edge region and the fourth edge region is a first overlapping area, and an overlapping area between the second edge region and the third edge region and the fourth edge region is a second overlapping area;

[0012] The area of ​​the conductive connection structure located in the first overlapping region and the second overlapping region is larger than the area of ​​the conductive connection structure in the non-overlapping region in the edge region.

[0013] Furthermore, the conductive connection structure further includes a plurality of third conductive connection structures and a plurality of fourth conductive connection structures;

[0014] The third conductive connection structure is arranged at any position in the middle of the first fine grid;

[0015] The fourth conductive connection structure is arranged at any position in the middle of the second fine grid.

[0016] Furthermore, the width D of the conductive connection structure along the second direction satisfies the following relationship: 0<D≤(P+2S);

[0017] Wherein, P is the width of the welding strip along the second direction, and S is the distance between two adjacent welding strips along the second direction.

[0018] Furthermore, the width D of the conductive connection structure along the second direction satisfies the following relationship: 0<D≤(P+S);

[0019] Wherein, P is the width of the welding strip along the second direction, and S is the distance between two adjacent welding strips along the second direction.

[0020] Furthermore, the angle α between the first direction and the third direction satisfies the following relationship: 0<tanα≤P / L;

[0021] 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 P is the width of the welding ribbon along the second direction.

[0022] Furthermore, the conductive connection structure is circular, rectangular or triangular.

[0023] Furthermore, in the second direction, the width of the welding strip is greater than or equal to the width of the fine grid; or

[0024] In the second direction, the width of the welding strip is smaller than the width of the fine grid.

[0025] The battery assembly provided in the embodiments of the present application includes the solar cell described in any one of the above embodiments.

[0026] The photovoltaic system provided in the embodiments of the present application includes the battery assembly described in the above embodiments.

[0027] In the solar cell, battery assembly and photovoltaic system of the embodiment of the present application, the solar cell includes a battery string, a plurality of fine grids, a conductive connection structure and a plurality of welding strips, the battery string includes a plurality of battery cells, the plurality of battery cells are distributed along a first direction, the plurality of fine grids are arranged on the battery cells, the fine grids include a plurality of first fine grids and a plurality of second fine grids, the first fine grids and the second fine grids extend along the first direction and are alternately arranged along the second direction, the first fine grids and the second fine grids have opposite grid properties, the conductive connection structure is arranged on the battery cell, the conductive connection structure includes a first conductive connection structure and a second conductive connection structure, the first conductive connection structure is arranged on the first fine grid The end portion and / or the second conductive connection structure are disposed at the end portion of the second fine grid. Several welding ribbons are disposed on the cell. The welding ribbons extend along the third direction and are spaced apart along the second direction. The welding ribbons cover or partially cover the first fine grid and the second fine grid and are electrically connected to the first fine grid and the second fine grid. At least one welding ribbon covers or partially covers the first fine grid and the first conductive connection structure and is electrically connected to the first fine grid and the first conductive connection structure. At least one welding ribbon covers or partially covers the second fine grid and the second conductive connection structure and is electrically connected to the second fine grid and the second conductive connection structure. The angle between the first direction and the third direction is an acute angle. In this way, by tilting the welding ribbons at an acute angle to the fine grid, the connection force between the welding ribbons and the fine grid is increased, ensuring a stable connection. At the same time, the provision of the conductive connection structure can further increase the contact area with the welding ribbon, thereby alleviating the problem of stress concentration and ensuring a stable connection between the welding ribbon and the cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a partial planar structural diagram of a solar cell according to an embodiment of the present application;

[0029] Figure 2 This is a partial planar structural diagram of a battery cell according to an embodiment of the present application;

[0030] Figure 3 is another partial planar structural schematic diagram of a solar cell according to an embodiment of the present application;

[0031] Figure 4 This is another partial schematic diagram of the planar structure of a solar cell according to an embodiment of the present application;

[0032] Figure 5 This is another partial schematic diagram of the planar structure of a solar cell according to an embodiment of the present application;

[0033] Figure 6 1 is a schematic diagram of the module structure of a battery assembly according to an embodiment of the present application;

[0034] Figure 7 It is a structural diagram of a photovoltaic system according to an embodiment of the present application.

[0035] Description of main component symbols:

[0036] Solar cell 100, cell 10, fine grid 11, first fine grid 111, second fine grid 112, first doped layer 123, second doped layer 124, conductive connection structure 13, first conductive connection structure 131, second conductive connection structure 132, third conductive connection structure 133, fourth conductive connection structure 134, middle region 14, edge region 15, first edge region 151, second edge region 152, third edge region 153, fourth edge region 154, first overlap region 155, second overlap region 156, first cell 101, second cell 102, welding ribbon 20, first welding ribbon 21, second welding ribbon 22, cell string 200, cell assembly 300, photovoltaic system 400. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, 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 are not to be construed as limiting the present application. In addition, it should be understood that the specific embodiments described herein are merely used to explain the present application and are not intended to limit the present application.

[0038] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "left", "right", "horizontal", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They 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, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0039] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature identified as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0041] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0042] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art will appreciate the application of other processes and / or the use scenarios of other materials.

[0043] In the related art, a solar cell is a semiconductor device that converts the energy of sunlight directly into electrical energy. Solar cells utilize the photovoltaic effect to excite electrons by absorbing photons, and conduct these electrons to generate current through a built-in electric field. At this time, the fine grid can collect and transmit current, thereby realizing the conversion of light energy into electrical energy. However, stress concentration is prone to occur at the connection position between the grid line and the welding ribbon, and when the welding ribbon is set or the lamination process is performed, the problem of disconnection between the welding ribbon and the grid line often occurs. In the embodiment of the present application, the welding ribbon and the fine grid are tilted at an acute angle to increase the connection force between the welding ribbon and the fine grid, thereby ensuring a stable connection. At the same time, the provision of a conductive connection structure can further increase the contact area with the welding ribbon, thereby alleviating the problem of stress concentration to ensure a stable connection between the welding ribbon and the battery cell.

[0044] Example 1

[0045] See also Figures 1 to 4 The present application provides a solar cell 100, which includes a cell string 200, a plurality of fine grids 11, a conductive connection structure 13, and a plurality of welding ribbons 20. The cell string 200 includes a plurality of cell sheets 10, which are distributed along a first direction. The plurality of fine grids 11 are arranged on the cell sheets 10. The fine grids 11 include a plurality of first fine grids 111 and a plurality of second fine grids 112. The first fine grids 111 and the second fine grids 112 extend along the first direction and are alternately arranged along the second direction. The first fine grids 111 and the second fine grids 112 have opposite polarities. The conductive connection structure 13 is arranged on the cell sheet 10. The conductive connection structure 13 includes a first conductive connection structure 131 and a second conductive connection structure 132. The first conductive connection structure 131 is arranged at the end of the first fine grid 111. The first and / or second conductive connection structures 132 are arranged at the ends of the second fine grids 112, and a plurality of welding ribbons 20 are arranged on the battery cell 10, the welding ribbons 20 extend along the third direction and are arranged at intervals along the second direction, the welding ribbons 20 cover or partially cover the first fine grids 111 and the second fine grids 112, and are conductively connected to the first fine grids 111 and the second fine grids 112, there is at least one welding ribbon 20 covering or partially covering the first fine grids 111 and the first conductive connection structures 131, and is electrically connected to the first fine grids 111 and the first conductive connection structures 131, there is at least one welding ribbon 20 covering or partially covering the second fine grids 112 and the second conductive connection structures 132, and is electrically connected to the second fine grids 112 and the second conductive connection structures 132, wherein the angle between the first direction and the third direction is an acute angle.

[0046] In the solar cell 100 of the embodiment of the present application, the solar cell 100 includes a cell string 200, a plurality of fine grids 11, a conductive connection structure 13 and a plurality of welding strips 20. The cell string 200 includes a plurality of cell sheets 10, and the plurality of cell sheets 10 are distributed along a first direction. The plurality of fine grids 11 are arranged on the cell sheets 10. The fine grids 11 include a plurality of first fine grids 111 and a plurality of second fine grids 112. The first fine grids 111 and the second fine grids 112 extend along the first direction and are alternately arranged along the second direction. The first fine grids 111 and the second fine grids 112 have opposite polarities. The conductive connection structure 13 is arranged on the cell sheet 10. The conductive connection structure 13 includes a first conductive connection structure 131 and a second conductive connection structure 132. The first conductive connection structure 131 is arranged on the first fine grid 111. The end portion and / or the second conductive connection structure 132 are disposed at the end portion of the second fine grid 112. Several solder ribbons 20 are disposed on the cell 10. The solder ribbons 20 extend along the third direction and are spaced apart along the second direction. The solder ribbons 20 cover or partially cover the first fine grid 111 and the second fine grid 112 and are electrically connected to the first fine grid 111 and the second fine grid 112. At least one solder ribbon 20 covers or partially covers the first fine grid 111 and the first conductive connection structure 131 and is electrically connected to the first fine grid 111 and the first conductive connection structure 131. At least one solder ribbon 20 covers or partially covers the second fine grid 112 and the second conductive connection structure 132 and is electrically connected to the second fine grid 112 and the second conductive connection structure 132. The angle between the first direction and the third direction is an acute angle. Thus, by tilting the solder ribbons 20 at an acute angle to the fine grid 11, the connection strength between the solder ribbons 20 and the fine grid 11 is increased, ensuring a stable connection. At the same time, providing the conductive connection structure 13 can further increase the contact area with the soldering ribbon 20 , thereby alleviating the problem of stress concentration and ensuring a stable connection between the soldering ribbon 20 and the battery cell 10 .

[0047] In the embodiments of the present application, the type of solar cell 100 is not limited to meet different needs. For example, in this embodiment, the solar cell 100 can be a back-contact cell. In this case, the front side of the cell 10 is used to receive light, and the back side of the cell 10 includes a plurality of alternating first doping layers 123 and second doping layers 124, and the first doping layers 123 and the second doping layers 124 both extend along the first direction. In some embodiments, the first doping layers 123 and the second doping layers 124 are alternately arranged along the second direction. At the same time, the first fine gate 111 and the second fine gate 112 extend along the first direction, and the first fine gate 111 and the second fine gate 112 have opposite polarities. The first fine gate 111 and the second fine gate 112 are alternately arranged along the second direction, and the first fine gate 111 and the first doping layer 123 are electrically connected together, and the second fine gate 112 and the second doping layer 124 are electrically connected together. Please combine Figure 1 and Figure 2The first fine grid 111 and the second fine grid 112 are shielded by the soldering strip 20 , and therefore, the first fine grid 111 and the second fine grid 112 are indicated by dotted lines below the soldering strip 20 .

[0048] Specifically, two first conductive connection structures 131 can be provided at either end of the first fine grid 111, and two second conductive connection structures 132 can be provided at either end of the second fine grid 112. This allows the soldering ribbon 20 to be stably connected to the conductive connection structures 13 at either end of the fine grid 11 when it is positioned on the battery string 200, thereby improving the connection stability between the soldering ribbon 20 and the fine grid 11 and optimizing current collection and conduction efficiency. At least one soldering ribbon 20 covers or partially covers the first fine grid 111 and the first conductive connection structure 131, and is electrically connected to the first fine grid 111 and the first conductive connection structure 131. Similarly, at least one soldering ribbon 20 covers or partially covers the second fine grid 112 and the second conductive connection structure 132, and is electrically connected to the second fine grid 112 and the second conductive connection structure 132. The angle formed between the first and third directions is acute, which enhances the connection between the soldering ribbon 20 and the fine grid 11 and ensures the stability of the electrical connection. The provision of the conductive connection structure 13 not only increases the contact area between the soldering ribbon 20 and the fine grid 11, but also effectively alleviates stress concentration during the soldering process, thereby further ensuring the stability of the connection between the soldering ribbon 20 and the cell 10. This design not only improves the current collection efficiency of the solar cell 100, but also enhances the durability and reliability of the overall structure.

[0049] Furthermore, the soldering ribbon 20 can be tilted at an acute angle to the fine grid 11 to increase the contact area between the soldering ribbon 20 and the fine grid 11, thereby increasing the electrical contact area between the soldering ribbon 20 and the fine grid 11 and improving the electrical conductivity efficiency from the doped layer to the soldering ribbon 20. Furthermore, the tilted soldering ribbon 20 can alleviate stress concentration, ensuring a stable connection between the soldering ribbon 20 and the cell 10 and improving the stability of the connection between the soldering ribbon 20 and the cell 10.

[0050] In the embodiments of the present application, the soldering ribbon 20 is actively tilted at an acute angle to the doped layer, which can reduce the manufacturing difficulty of the battery assembly 300, reduce the alignment requirements during the welding process, improve the welding tolerance and precision, and reduce manufacturing complexity. The tilted setting method is easier to operate automated equipment, improves production efficiency, reduces manual intervention, and reduces production costs. The design of the soldering ribbon 20 at an acute angle helps to disperse mechanical stress, reduce stress concentration at the weld point, and improve the reliability and durability of the weld point.

[0051] In addition, in the embodiment of the present application, the shape of the battery cell 10 is not limited to meet different needs. For example, the battery cell 10 can be a rectangular or square whole battery cell 10. The square whole battery cell 10 is then designed to correspond to a single rectangular battery cell 10 or a single battery cell 10 slice (two slices, three slices, etc.) after cutting. The battery cell 10 has no fine grids 11 and electrode structures on the front side, and the positive and negative fine grids 11 are distributed alternately on the back side of the battery cell 10. In addition, in the embodiment of the present application, the number of the first fine grids 111 and the second fine grids 112, the size ranges of each, and the spacing between adjacent fine grids 11 are not limited. It is only necessary that the fine grids 11 can be covered or partially covered by the welding strip 20 to meet different needs.

[0052] For example, the first fine grid 111 can be the positive electrode, and the second fine grid 112 can be the negative electrode. Of course, in other embodiments, the opposite can be true, that is, the first fine grid 111 can be the negative electrode, and the second fine grid 112 can be the positive electrode, which is not limited here. The alternating distribution of the first fine grid 111 and the second fine grid 112 and their precise connection to the welding ribbon 20 enable more efficient current collection and transmission, reducing electrical losses in the fine grid 11.

[0053] It is understood that the “first” and “second” in the first solar cell 101 and the second solar cell 102 are relative concepts, which means that the two solar cells 100 are different. Figure 1 In the example, the battery cell 10 on the left is marked as the first battery cell 101 , and the battery cell 10 on the right is marked as the second battery cell 102 .

[0054] In some optional embodiments, the soldering ribbon 20 is in the form of an elongated strip, and the width of the soldering ribbon 20 is smaller than the spacing between the first fine grid 111 and the second fine grid 112. In this way, when the soldering ribbon 20 is disposed on the cell 10, the problem of a short circuit caused by a soldering ribbon 20 simultaneously crossing over two fine grids 11 of a cell 10 is avoided.

[0055] Specifically, the width of the soldering ribbon 20 is smaller than the spacing between the first fine grid 111 and the second fine grid 112, ensuring that when the soldering ribbon 20 is arranged, it does not simultaneously cross over and connect two adjacent fine grids 11. By controlling the width of the soldering ribbon 20, a soldering ribbon 20 is prevented from simultaneously crossing over two fine grids 11 of a cell 10, thereby preventing short circuits.

[0056] Furthermore, in the process of preparing the battery string 200, the welding ribbon 20 can cover the fine grids 11 of multiple battery cells 10 on the same straight line at one time along the third direction, thereby improving welding efficiency, reducing welding steps and time, and being suitable for large-scale production. The design of the welding ribbon 20 being attached to the fine grid 11 after being tilted at a certain angle facilitates the operation of automated equipment and improves the accuracy and consistency of production. Then, the predetermined positions of different battery cells 10 are cut off by laser cutting or other methods to form the battery string 200. In this way, the first doped layer 123 and the second doped layer 124 can conduct current to the welding ribbon 20 through the first fine grid 111 and the second fine grid 112, so that the current can be further conducted to the busbar through the welding ribbon 20.

[0057] In some embodiments, the spacing between the first fine grid 111 and the second fine grid 112 can be flexibly adjusted based on actual needs. The first fine grid 111 and the second fine grid 112 can be arranged with equal spacing, which ensures uniform current distribution and improves the overall efficiency of the battery assembly 300. Alternatively, an unequal spacing arrangement can optimize the current conduction path for specific application scenarios, reducing issues such as localized overheating or excessive resistance. A combination of partially equal spacing and partially unequal spacing can combine the advantages of both, allowing for flexible adjustment based on specific needs to optimize the performance of the battery assembly 300.

[0058] Furthermore, in some embodiments, the center distance between two adjacent fine grids 11 is equal; the center distance between two adjacent fine grids 11 is equal to the center distance between two adjacent welding ribbons 20. After the fine grids 11 are evenly distributed on the back of the cell 10, the welding ribbons 20 can also be evenly distributed on the back of the cell 10, with the center distance between adjacent welding ribbons 20 equal to the center distance between adjacent fine grids 11. This allows the welding ribbons 20 to be precisely aligned with the fine grids 11, ensuring that each fine grid 11 can effectively connect to the welding ribbon 20.

[0059] In the embodiments of this application, "equal center distances" means "the distance between the structural centers of two adjacent structures is equal to the distance between the structural centers of another two adjacent structures." In terms of manufacturing process, "equal" can mean an allowable error ratio between 0.9 and 1.1. That is, when the rated center distance is 1, the maximum error distance can be 1.1 times the rated distance, and the minimum error distance can be 0.9 times the rated distance.

[0060] Furthermore, in some embodiments, multiple soldering ribbons 20 are arranged in parallel; the first fine grid 111, the second fine grid 112, the first doped layer 123, and the second doped layer 124 are all arranged in parallel. In this way, multiple soldering ribbons 20 are arranged in parallel on the back side of the cell 10 and are evenly distributed in a direction perpendicular to the third direction, ensuring consistent spacing between the soldering ribbons 20 and forming a regular layout. Furthermore, the soldering ribbons 20 can be arranged corresponding to the fine grids 11 or doped layers.

[0061] In the embodiments of the present application, the doping types of the first doping layer 123 and the second doping layer 124 are not limited. For example, the first doping layer 123 is a P-type doping layer and the second doping layer 124 is an N-type doping layer. Alternatively, the first doping layer 123 is an N-type doping layer and the second doping layer 124 is a P-type doping layer, as long as the polarities of the two are opposite to meet different needs. In some embodiments, the first doping layer 123 can be a P-type polysilicon layer, a P-type amorphous silicon layer, a P-type microcrystalline silicon layer, or an N-type polysilicon layer, an N-type amorphous silicon layer, or an N-type microcrystalline silicon layer, and the specific details are not limited here. Similarly, the second doping layer 124 can be a P-type polysilicon layer, a P-type amorphous silicon layer, a P-type microcrystalline silicon layer, or an N-type polysilicon layer, an N-type amorphous silicon layer, or an N-type microcrystalline silicon layer, and the specific details are not limited here, as long as the polarities of the two are opposite. When the first doping layer 123 is a P-type doping layer and the second doping layer 124 is an N-type doping layer, the first fine gate 111 corresponding to the first doping layer 123 is a P-type fine gate 11 and the second fine gate 112 corresponding to the second doping layer 124 is an N-type fine gate 11.

[0062] In some embodiments, P-type doping refers to doping with Group III elements, including boron, aluminum, gallium, indium, thallium, and other elements; N-type doping refers to doping with Group V elements, including nitrogen, phosphorus, arsenic, antimony, bismuth, and other elements, which are not specifically limited here. In addition, in some embodiments, the first doping layer 123 and the second doping layer 124 can also be composite doping, for example, the N-type doping also includes a small amount of P-type doping elements. The content of the N-type doping element in the second doping layer 124 is higher than 20% of the content of the P-type doping element to ensure that the polarity is opposite to that of the first doping layer 123.

[0063] Example 2

[0064] See also Figure 1 and Figure 2In some optional embodiments, the battery cell 10 includes a first battery cell 101 and a second battery cell 102, the first fine grid 111 of the first battery cell 101 and the second fine grid 112 of the second battery cell 102 are arranged in a one-to-one correspondence, and the welding ribbon 20 includes a first welding ribbon 21 and a second welding ribbon 22, the first welding ribbon 21 connects the first fine grid 111 and the first conductive connection structure 131 of the first battery cell 101 and the second fine grid 112 and the second conductive connection structure 132 of the second battery cell 102, and the second welding ribbon 22 connects the first fine grid 111 and the first conductive connection structure 131 of the second battery cell 102 and the to-be-connected component (not shown in the figure).

[0065] In this way, the first fine grid 111 of the first cell 101 and the second fine grid 112 of the second cell 102 correspond one-to-one along the same straight line; at the same time, the second fine grid 112 of the first cell 101 and the first fine grid 111 of the second cell 102 correspond one-to-one along the same straight line, so that the first welding ribbon 21 can connect the first cell 101 and the second cell 102 in series. The second welding ribbon 22 can connect the first fine grid 111 of the second cell 102 to other components to be connected, thereby realizing the series connection of multiple cell 10 to form a cell string 200.

[0066] Specifically, the first and second directions can be perpendicular. In this case, the cell 10 can be rectangular to maximize the area of ​​the cell 10. The solder ribbon 20 is disposed on at least two cell cells 10 in the third direction, electrically connecting the first fine grid 111 of each cell 10 to the second fine grid 112 of the adjacent second cell cell 102. The first solder ribbon 21 connects the first fine grid 111 of the first cell cell 101 to the second fine grid 112 of the second cell cell 102, the second solder ribbon 22 connects the first fine grid 111 of the second cell cell 102 to the second fine grid 112 of another first cell cell 101, and so on. The first and second solder ribbons 21, 22 are alternately distributed in the second direction to connect the heterogeneously doped layers of adjacent cell cells 10 to form a cell string 200.

[0067] Furthermore, the angle between the first and third directions is acute. By angling the solder ribbon 20 at an acute angle to the doped layer, the contact area between the solder ribbon 20 and the cell 10 is significantly increased, thereby improving the electrical contact area between the solder ribbon 20 and the doped layer and enhancing electrical conductivity. Furthermore, the tilted design of the solder ribbon 20 effectively alleviates stress concentration, ensuring the stability of the connection between the solder ribbon 20 and the cell 10 and reducing connection failures due to mechanical stress or temperature fluctuations. The secure connection between the solder ribbon 20 and the doped layer ensures a stable electrical connection between the cell 10, improving reliability and service life.

[0068] Furthermore, the two first conductive connection structures 131 can be respectively arranged at the two ends of the first fine grid 111, and the two second conductive connection structures 132 can be respectively arranged at the two ends of the second fine grid 112. In this way, when the welding ribbon 20 is set on the battery string 200, the welding ribbon 20 can be stably connected to the conductive connection structures 13 at both ends of the fine grid 11, so as to improve the connection stability between the welding ribbon 20 and the fine grid 11 and optimize the current collection and conduction efficiency.

[0069] It is understood that the battery string 200 may include two battery cells 10 connected in series, or three battery cells 10 connected in series, or any other greater number of battery cells 10. The specific number of battery cells 10 to be connected in series can be determined based on actual usage. In addition, in the embodiment of the present application, there is no limitation on the size and type of the battery cells 10. The specifications and sizes of adjacent battery cells 10 can be the same or different to meet different needs.

[0070] In the embodiments of this application, the specific arrangement of adjacent cells 10 is not limited to meet different needs. In one embodiment, the edges of two adjacent cells 10 are at least partially stacked together; in another embodiment, the two adjacent cells 10 can be spaced apart. The spacing between two adjacent cells 10 is within an appropriate range to avoid the limited operating space and welding difficulties caused by too small a spacing, and to avoid the waste of component space and increased costs caused by too large a spacing.

[0071] For example, in one example, the first fine grid 111 of the first cell 101 and the second fine grid 112 of the second cell 102 correspond one-to-one along the same straight line. In this case, the first welding ribbon 21 is used to connect the first fine grid 111 of the first cell 101 and the second fine grid 112 of the second cell 102. In this case, the first conductive connection structure 131 can be provided at an end of the first fine grid 111 away from the second cell 102, and the second conductive connection structure 132 can be provided at an end of the second fine grid 112 away from the first cell 101. In this way, the first welding ribbon 21 can be electrically connected to the first fine grid 111 and the second fine grid 112, and is electrically connected to the first welding ribbon 21 through the two conductive connection structures 13, thereby stably connecting the first welding ribbon 21 to the first fine grid of the first cell 101 and the second fine grid of the second cell 102.

[0072] In another example, the first welding strip 21 is used to connect the first fine grid 111 of the first battery cell 101 and the second fine grid 112 of the second battery cell 102. At this time, the first conductive connection structure 131 can be set at an end of the first fine grid 111 away from the second battery cell 102, and the second conductive connection structure 132 can be set at an end of the second fine grid 112 close to the first battery cell 101.

[0073] In another example, the first welding ribbon 21 is used to connect the first fine grid 111 of the first battery cell 101 and the second fine grid 112 of the second battery cell 102. At this time, the first conductive connection structure 131 can be set at an end of the first fine grid 111 close to the second battery cell 102, and the second conductive connection structure 132 can be set at an end of the second fine grid 112 away from the first battery cell 101.

[0074] In another example, the first welding ribbon 21 is used to connect the first fine grid 111 of the first battery cell 101 and the second fine grid 112 of the second battery cell 102. At this time, the first conductive connection structure 131 can be set at an end of the first fine grid 111 close to the second battery cell 102, and the second conductive connection structure 132 can be set at an end of the second fine grid 112 close to the first battery cell 101.

[0075] Example 3

[0076] See also Figure 1 and Figure 2 In some optional embodiments, the component to be connected is the second fine grid 112 or bus bar of another adjacent first battery cell 101 .

[0077] In this way, the second cell 102 and another adjacent first cell 101 can be connected together through the second welding ribbon 22 , and the second cell 102 and an adjacent bus bar can also be connected together through the second welding ribbon 22 , thereby forming a cell string 200 .

[0078] For example, the component to be connected may be the second fine grid 112 of another adjacent first cell 101. During the manufacturing process, a welding ribbon 20 can be simultaneously placed on the fine grids 11 of multiple cells 10 in the same straight line, and then disconnected at a predetermined location to ensure that the welding ribbon 20 can connect the first fine grid 111 and the second fine grid 112 of adjacent cells 10. For example, the first welding ribbon 21 can connect the first fine grid 111 of a first cell 10 and the second fine grid 112 of a second cell 10, and then disconnected at the end of the second fine grid 112 of the second cell 10 away from the first cell 10. Similarly, the second welding ribbon 22 can connect the first fine grid 111 of the second cell 10 and the second fine grid 112 of another first cell 10, and then disconnected at the end of the second fine grid 112 of another first cell 10 away from the second cell 10. In this way, a continuous cell string 200 can be formed.

[0079] In another example, the part to be connected may be a bus structure (not shown in the figure), which may be connected to a welding ribbon 20 of the same polarity to form a loop with the battery string 200 to conduct the current. The second welding ribbon 22 at the end of the battery string 200 may be connected to only the fine grid 11 on one battery cell 10 and extend relative to the battery cell 10 to connect to the bus structure to wait for the connection part. In the embodiment of the present application, the form of the bus structure is not limited to meet different needs. For example, the bus structure may be a conductive material such as a wire, a bus bar, or a conductive tape.

[0080] Example 4

[0081] See also Figure 1 、 Figure 2 and Figure 3 In some optional embodiments, in the second direction, the spacing between adjacent first conductive connection structures 131 and second conductive connection structures 132 is 50 μm-400 μm. For example, in the second direction, the spacing between adjacent first conductive connection structures 131 and second conductive connection structures 132 may be 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, or 400 μm.

[0082] In this way, the spacing between the first conductive connection structure 131 and the second conductive connection structure 132 is set within this range. On the one hand, it can avoid the short circuit caused by the first conductive connection structure 131 and the second conductive connection structure 132 being too close. On the other hand, it can increase the contact connection area of ​​the conductive connection structure 13, thereby improving the connection effect with the soldering strip 20.

[0083] Specifically, setting the spacing between the first conductive connection structure 131 and the second conductive connection structure 132 within this range can, on the one hand, effectively avoid the risk of short circuits caused by the proximity of two adjacent conductive connection structures 13, thereby ensuring the safety and reliability of the solar cell 100. On the other hand, such a spacing range can provide sufficient space to increase the contact area between the conductive connection structure 13 and the soldering ribbon 20. The increased contact area not only improves the current conduction efficiency, but also significantly improves the connection between the soldering ribbon 20 and the conductive connection structure 13, further enhancing the overall performance and durability of the cell 10. In this way, by precisely controlling the spacing between the first conductive connection structure 131 and the second conductive connection structure 132, the safety and reliability of the cell 10 can be ensured while optimizing electrical performance.

[0084] Example 5

[0085] See also Figure 1 and Figure 5In some optional embodiments, the battery cell 10 includes a middle region 14 and four edge regions 15 surrounding the middle region 14;

[0086] The area of ​​the conductive connection structure 13 located in the edge region 15 is larger than the area of ​​the conductive connection structure 13 in the middle region 14 .

[0087] In this way, the area of ​​the conductive connection structure 13 located at the edge of the battery cell 10 is larger, which is beneficial to the connection of the welding ribbon 20 and ensures the connection stability of the battery string 200.

[0088] Specifically, the conductive connection structure 13 can be located at the ends of the fine grid 11 or in the middle of the fine grid 11. The conductive connection structure 13 at the edge of the cell 10 has a larger area, which increases the contact area between the soldering ribbon 20 and the fine grid 11, effectively reducing the resistance at the connection and ensuring reliable current conduction. Meanwhile, the conductive connection structure 13 in the middle has a smaller area, saving material while not affecting overall electrical performance.

[0089] Example 6

[0090] See also Figure 1 and Figure 5 In some optional embodiments, the edge region 15 includes a first edge region 151 and a second edge region 152 along the first direction, and the edge region 15 further includes a third edge region 153 and a fourth edge region 154 along the second direction. The overlapping area of ​​the first edge region 151, the third edge region 153, and the fourth edge region 154 is a first overlapping area 155, and the overlapping area of ​​the second edge region 152, the third edge region 153, and the fourth edge region 154 is a second overlapping area 156.

[0091] The area of ​​the conductive connection structure 13 located in the first overlapping region 155 and the second overlapping region 156 is larger than the area of ​​the conductive connection structure 13 in the non-overlapping region in the edge region 15 .

[0092] In this way, the area of ​​the conductive connection structure 13 located in the first overlapping area 155 and the second overlapping area 156 is larger than the area of ​​the conductive connection structure 13 in the non-overlapping area in the edge area 15. That is to say, the area of ​​the conductive connection structure 13 in the four corners of the battery cell 10 is larger and has better connection capability.

[0093] Specifically, the battery cell 10 is rectangular in shape, facilitating large-scale production and arrangement, and improving space utilization. The area of ​​the conductive connection structure 13 located in the first overlapping region 155 and the second overlapping region 156 is larger than the area of ​​the conductive connection structure 13 in the non-overlapping region of the edge region 15. In other words, the conductive connection structure 13 in the first overlapping region 155 and the second overlapping region 156 has a larger area, which facilitates connection with the soldering ribbon 20. The soldering ribbon 20 can evenly cover the fine grid 11, effectively preventing disconnection between the soldering ribbon 20 and the fine grid 11 and improving connection reliability. In addition, the soldering ribbon 20 is tilted relative to the edge of the battery cell 10, allowing for flexible adjustment of the contact position between the soldering ribbon 20 and the fine grid 11 to accommodate battery cells 10 of different types and sizes. The tilted soldering ribbon 20 can effectively disperse mechanical stress, reduce solder joint damage caused by stress concentration, and extend the service life of the battery assembly 300.

[0094] Furthermore, the area of ​​the conductive connection structure 13 located in the first overlapping region 155 and the second overlapping region 156 is larger than the area of ​​the conductive connection structure 13 in the non-overlapping region in the edge region 15. At the same time, the area of ​​the conductive connection structure 13 in the edge region 15 is larger than the area of ​​the conductive connection structure 13 in the middle region 14. This not only enhances the connection capability of the soldering ribbon 20 in these key positions, but also further improves the overall connection stability of the battery cell 10. The increase in the area of ​​the conductive connection structure 13 means that the soldering ribbon 20 has a larger contact surface in the overlapping area, reducing the contact resistance and ensuring the efficiency and stability of current transmission. In contrast, the area of ​​the conductive connection structure 13 in the non-overlapping portion of the edge region 15 is relatively small, saving material while not affecting the overall performance. Therefore, this area-differentiated design strengthens the connection effect of the corners of the battery cell 10 and provides a guarantee for the long-term stable operation of the battery string 200.

[0095] Example 7

[0096] See also Figure 1 and Figure 5 In some optional embodiments, the conductive connection structure 13 further includes a plurality of third conductive connection structures 133 and a plurality of fourth conductive connection structures 134;

[0097] The third conductive connection structure 133 is provided at any position in the middle of the first fine gate 111;

[0098] The fourth conductive connection structure 134 is disposed at any position in the middle of the second fine gate 112 .

[0099] In this way, the conductive connection structure 13 located in the first overlapping region 155 and the second overlapping region 156 can extend in length and width along the first and second directions, thereby increasing its own area and ensuring a stable connection with the soldering ribbon 20. The third conductive connection structure 133 and the fourth conductive connection structure 134 can assist the first conductive connection structure 131 and the second conductive connection structure 132 in connecting to the soldering ribbon 20, thereby ensuring a stable connection with the soldering ribbon 20.

[0100] Specifically, by adding the conductive connection structures 13 in these intermediate regions 14, the conductive connection structures 13 located in the first overlap region 155 and the second overlap region 156 can further extend their length and width along the first and second directions, thereby increasing the contact area and connection strength with the soldering ribbon 20. This not only helps ensure a stable electrical connection between the soldering ribbon 20 and the conductive connection structures 13, but also effectively disperses and alleviates stress concentration that may occur at the edges and intermediate regions 14 of the cell 10.

[0101] Furthermore, when multiple conductive connection structures 13 are arranged in the first overlapping area 155 and the second overlapping area 156, the area of ​​the conductive connection structure 13 closest to the edge of the battery cell 10 among the multiple conductive connection structures 13 is the largest, and the area of ​​the conductive connection structure 13 closer to the middle area 14 is smaller.

[0102] Of course, it should be noted that it is only necessary to limit the area of ​​the conductive connection structure 13 to be larger the closer it is to the edge of the battery cell 10, and there is no need to limit the degree of change of the conductive connection structure 13 in the first direction or the second direction. It is possible to only change the length of the conductive connection structure 13 along the first direction to achieve the adjustment area, so as to meet different needs.

[0103] Example 8

[0104] See also Figures 3 to 5 In some optional embodiments, the width D of the conductive connection structure 13 along the second direction satisfies the following relationship: 0<D≤(P+2S);

[0105] Wherein, P is the width of the soldering strip 20 along the second direction, and S is the distance between two adjacent soldering strips 20 along the second direction.

[0106] Thus, in such an embodiment, the conductive connection structures 13 can be arranged at intervals along the second direction at the ends of the first fine grid 111 or the second fine grid 112. That is, on a single cell 10, the first conductive connection structures 131 can be arranged only on the first fine grid 111, without being arranged on the second fine grid 112; or, on a single cell 10, the second conductive connection structures 132 can be arranged only on the second fine grid 112, without being arranged on the first fine grid 111. This ensures stable connection while reducing the material usage of the conductive connection structures 13.

[0107] For example, a first conductive connection structure 131 can be set on the first fine grid 111 of the first battery cell 101, and at the same time, a first conductive connection structure 131 can be set on the first fine grid 111 of the adjacent second battery cell 102. In this way, when the first welding strip 21 and the second welding strip 22 are alternately arranged and connected to the battery cell 10, it can be ensured that at least one conductive connection structure 13 is connected to the welding strip 20, thereby ensuring that all battery cells 10 in the entire battery string 200 are stably connected to the welding strip 20.

[0108] In one example, the first conductive connection structure 131 is provided on the first fine grid 111 of the cell 10, while the conductive connection structure 13 is not provided on the second fine grid 112. In another example, the second conductive connection structure 132 is provided on the second fine grid 112 of the cell 10, while the conductive connection structure 13 is not provided on the first fine grid 111. This ensures that the width D of the conductive connection structure 13 along the second direction satisfies the following relationship: 0<D≤(P+2S).

[0109] Embodiment 9

[0110] See also Figures 3 to 5 In some optional embodiments, the width D of the conductive connection structure 13 along the second direction satisfies the following relationship: 0<D≤(P+S);

[0111] Wherein, P is the width of the soldering strip 20 along the second direction, and S is the distance between two adjacent soldering strips 20 along the second direction.

[0112] Thus, in such an embodiment, the conductive connection structure 13 needs to be provided at both the end of the first fine grid 111 and the end of the second fine grid 112 , so as to ensure a stable connection between each soldering strip 20 and the fine grid 11 .

[0113] Specifically, in such an embodiment, the soldering strip 20 can cover or partially cover the conductive connection structure 13 to ensure that within a limited width range, the soldering strip 20 can be in contact and connected with at least part of the area of ​​the conductive connection structure 13, thereby ensuring that the electrical connection between the soldering strip 20 and the fine grid 11 is stable.

[0114] In one example, a first conductive connection structure 131 is disposed on the first fine grid 111 of the cell 10, and a second conductive connection structure 132 is disposed on the second fine grid 112, so that a width D of the conductive connection structure 13 along the second direction satisfies the following relationship: 0<D≤(P+S).

[0115] Example 10

[0116] See also Figures 1 to 3 In some optional embodiments, the angle α between the first direction and the third direction satisfies the following relationship: 0<tanα≤P / L;

[0117] Wherein, L is the total length of the farthest ends of the first battery cell 10 and the last battery cell 10 in the battery string 200 along the first direction, and P is the width of the welding ribbon 20 along the second direction.

[0118] In this way, the inclination angle of the welding ribbon 20 can be obtained according to the length of the battery string 200, and the angle can be adjusted for battery strings 200 of different lengths and types so that a welding ribbon 20 can first completely cover the doping layer on the same straight line of multiple battery cells 10. In this way, the process preparation can be facilitated. After the welding ribbon 20 connects multiple battery cells 10 in series, it is selectively cut by laser to form a battery string 200 in groups of two. This method can effectively ensure the uniform coverage of the welding ribbon 20 in the entire battery string 200, while facilitating the subsequent processing and assembly of the battery cells 10. By optimizing the angle and coverage method of the welding ribbon 20, production efficiency can be improved and the electrical performance and manufacturing quality of the battery cells 10 can be ensured.

[0119] Specifically, the inclination angle α of the solder ribbon 20 can be determined based on the total length L of the cell string 200. This angle can be adjusted for cell strings 200 of different lengths and types, allowing a single solder ribbon 20 to completely cover the doped layers along the same straight line across multiple cells 10. This design not only improves the coverage efficiency of the solder ribbon 20 but also simplifies the manufacturing process.

[0120] Furthermore, the inclination angle of the welding ribbon 20 is flexibly adjusted according to the length of the battery string 200 and the spacing width between the fine grids 11 to adapt to the specific needs of different battery strings 200, ensuring that the welding ribbon 20 can completely cover the fine grids 11. Then, by accurately calculating the angle α, the welding ribbon 20 can extend in a straight line when covering the doping layer, thereby improving the efficiency and consistency of welding. One weld can completely cover the fine grids 11 of multiple battery cells 10 on the process production line, simplifying the welding process, reducing the welding steps, and improving production efficiency. After the welding ribbon 20 connects multiple battery cells 10 in series, it is selectively sheared by laser to form a battery string 200 in groups of two. This method is efficient and accurate, reducing the complexity of the production process.

[0121] For example, a cell string 200 may include nine cells 10 evenly distributed along a first direction, where L is the distance between the farthest ends of the nine cells 10. The inclination angle α is calculated based on this length and the width of the doped layer in the second direction, allowing the solder ribbon 20 to be tilted at an angle of α.

[0122] In the embodiment of the present application, the angle range between the first direction and the third direction is not limited to meet different requirements. In this way, it can be adjusted according to the length of different battery strings 200 and the width of the doping layer in the second direction.

[0123] In the embodiment of the present application, the center distance between two adjacent welding strips 20 is not limited to meet different requirements. For example, the center distance between two adjacent welding strips 20 can be greater than or equal to 100 μm, preferably, the center distance between two adjacent welding strips 20 can be 300 μm.

[0124] Example 11

[0125] See also Figure 1 and Figure 2 In some optional embodiments, the conductive connection structure 13 is circular, rectangular or triangular.

[0126] In this way, the conductive connection structure 13 can be any one of a circle, a rectangle and a triangle, or can be a mixture of multiple shapes to meet different connection requirements.

[0127] Specifically, by flexibly utilizing these geometric shapes, different connection requirements can be better adapted to improve the overall performance of the solar cell 100. This not only improves the connection stability of the solar cell 100, but also provides more options for the manufacturing process, further enhancing the adaptability and reliability of the product.

[0128] Example 12

[0129] See also Figures 1 to 3 In some optional embodiments, in the second direction, the width of the soldering strip 20 is greater than or equal to the width of the fine grid 11; or

[0130] In the second direction, the width of the solder strip 20 is smaller than the width of the fine grid 11 .

[0131] In this way, the width of the welding strip 20 can be larger or smaller than the fine grid 11 and can be adjusted to meet different needs.

[0132] Specifically, when the width of the welding ribbon 20 is greater than or equal to the width of the fine grid 11, it can ensure that the welding ribbon 20 completely covers the width of the fine grid 11, providing a larger contact surface, thereby enhancing the electrical connection between the welding ribbon 20 and the fine grid 11. This setting helps to improve the connection strength and stability of the welding ribbon 20 and ensure efficient conduction of current. When the width of the welding ribbon 20 is less than the width of the fine grid 11, the width of the welding ribbon 20 is smaller, which can reduce the use of materials while still achieving effective current conduction. This flexible width adjustment capability enables the welding ribbon 20 to meet the design and manufacturing requirements of different battery cells 10. Regardless of whether the width of the welding ribbon 20 is selected to be greater than or less than the width of the fine grid 11, it is possible to optimize production costs and processes while ensuring electrical performance.

[0133] Example 13

[0134] See also Figure 6 The battery assembly 300 provided in the embodiment of the present application includes the solar cell 100 of any one of the above embodiments.

[0135] In the solar cell 100 and the battery assembly 300 of the embodiment of the present application, the solar cell 100 includes a battery string 200, a plurality of fine grids 11, a conductive connection structure 13 and a plurality of welding strips 20, the battery string 200 includes a plurality of battery cells 10, the plurality of battery cells 10 are distributed along a first direction, a plurality of fine grids 11 are arranged on the battery cells 10, the fine grids 11 include a plurality of first fine grids 111 and a plurality of second fine grids 112, the first fine grids 111 and the second fine grids 112 extend along the first direction and are alternately arranged along the second direction, the first fine grids 111 and the second fine grids 112 have opposite polarities, the conductive connection structure 13 is arranged on the battery cell 10, the conductive connection structure 13 includes a first conductive connection structure 131 and a second conductive connection structure 132, the first conductive connection structure 131 is arranged on the first fine grid The ends of the first and second fine grids 111 and / or the second conductive connection structures 132 are disposed at the ends of the second fine grids 112. Several solder ribbons 20 are disposed on the cell 10. The solder ribbons 20 extend along the third direction and are spaced apart along the second direction. The solder ribbons 20 cover or partially cover the first and second fine grids 111, 112, and are electrically connected to the first and second fine grids 111, 112. At least one solder ribbon 20 covers or partially covers the first fine grid 111 and the first conductive connection structures 131, and is electrically connected to the first fine grid 111 and the first conductive connection structures 131. At least one solder ribbon 20 covers or partially covers the second fine grid 112 and the second conductive connection structures 132, and is electrically connected to the second fine grid 112 and the second conductive connection structures 132. The angle between the first and third directions is acute. Thus, by tilting the solder ribbons 20 at an acute angle to the fine grids 11, the connection strength between the solder ribbons 20 and the fine grids 11 is increased, ensuring a stable connection. At the same time, providing the conductive connection structure 13 can further increase the contact area with the soldering ribbon 20 , thereby alleviating the problem of stress concentration and ensuring a stable connection between the soldering ribbon 20 and the battery cell 10 .

[0136] It is understood that in such an embodiment, the battery assembly 300 may further include a frame, a backplane, photovoltaic glass, and an adhesive film. The adhesive film may be filled between the front and back surfaces of the battery cell 10 and between the photovoltaic glass and adjacent battery cells 10. As a filler, it may be a transparent colloid with good light transmittance and aging resistance. For example, the adhesive film may be EVA film or POE film. The specific selection can be based on actual conditions and is not limited here.

[0137] Photovoltaic glass can cover the adhesive film on the front of the cell 10. The photovoltaic glass can be ultra-clear glass, which has high light transmittance, high transparency, and excellent physical, mechanical, and optical properties. For example, ultra-clear glass can have a light transmittance of over 92%, protecting the cell 10 while minimizing the impact on the efficiency of the cell 10. The adhesive film can also bond the photovoltaic glass and cell 10 together, providing sealing, insulation, and waterproofing of the cell 10.

[0138] The backsheet can be attached to the film on the back of the cell 10. The backsheet can protect and support the cell 10 and has reliable insulation, water resistance, and aging resistance. There are multiple options for the backsheet, which can generally be tempered glass, organic glass, aluminum alloy TPT composite film, etc. The specific configuration can be based on the specific situation and is not limited here. The entire structure consisting of the backsheet, cell 10, film, and photovoltaic glass can be set on a frame. The frame serves as the main external support structure of the entire battery assembly 300 and can provide stable support and installation for the battery assembly 300. For example, the battery assembly 300 can be installed in the desired location via the frame.

[0139] Example 14

[0140] See also Figure 7 The photovoltaic system 400 provided in the embodiment of the present application includes the battery assembly 300 of the above embodiment.

[0141] In the solar cell 100, the battery assembly 300, and the photovoltaic system 400 of the embodiment of the present application, the solar cell 100 includes a battery string 200, a plurality of fine grids 11, a conductive connection structure 13, and a plurality of welding ribbons 20. The battery string 200 includes a plurality of battery cells 10, and the plurality of battery cells 10 are distributed along a first direction. The plurality of fine grids 11 are arranged on the battery cells 10. The fine grids 11 include a plurality of first fine grids 111 and a plurality of second fine grids 112. The first fine grids 111 and the second fine grids 112 extend along the first direction and are alternately arranged along the second direction. The first fine grids 111 and the second fine grids 112 have opposite polarities. The conductive connection structure 13 is arranged on the battery cell 10. The conductive connection structure 13 includes a first conductive connection structure 131 and a second conductive connection structure 132. The first conductive connection structure 131 is arranged on the battery cell 10. The ends of the first fine grid 111 and / or the second conductive connection structure 132 are disposed at the ends of the second fine grid 112. Several solder ribbons 20 are disposed on the cell 10. The solder ribbons 20 extend along the third direction and are spaced apart along the second direction. The solder ribbons 20 cover or partially cover the first fine grid 111 and the second fine grid 112 and are electrically connected to the first fine grid 111 and the second fine grid 112. At least one solder ribbon 20 covers or partially covers the first fine grid 111 and the first conductive connection structure 131 and is electrically connected to the first fine grid 111 and the first conductive connection structure 131. At least one solder ribbon 20 covers or partially covers the second fine grid 112 and the second conductive connection structure 132 and is electrically connected to the second fine grid 112 and the second conductive connection structure 132. The angle between the first direction and the third direction is acute. Thus, by tilting the solder ribbons 20 at an acute angle to the fine grid 11, the connection strength between the solder ribbons 20 and the fine grid 11 is increased, ensuring a stable connection. At the same time, providing the conductive connection structure 13 can further increase the contact area with the soldering ribbon 20 , thereby alleviating the problem of stress concentration and ensuring a stable connection between the soldering ribbon 20 and the battery cell 10 .

[0142] In this embodiment, the photovoltaic system 400 can be applied to photovoltaic power stations, such as ground power stations, rooftop power stations, water-surface power stations, etc., and can also be applied to equipment or devices that use solar energy to generate electricity, such as user solar power supplies, solar street lights, solar cars, solar buildings, etc. Of course, it is understandable that the application scenarios of the photovoltaic system 400 are not limited to this. In other words, the photovoltaic system 400 can be applied to all fields that require solar power generation. Taking the photovoltaic power generation system network as an example, the photovoltaic system 400 may include a photovoltaic array, a junction box, and an inverter. The photovoltaic array can be an array combination of multiple battery assemblies 300. For example, multiple battery assemblies 300 can form multiple photovoltaic arrays. The photovoltaic array is connected to a junction box, which can combine the current generated by the photovoltaic array. The combined current flows through the inverter to convert it into the alternating current required by the mains power grid and then connects to the mains power network to achieve solar power supply.

[0143] Throughout this specification, reference to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present application. In this specification, the illustrative use of the above terms does 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 any one or more embodiments or examples.

[0144] In addition, the above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A solar cell, characterized in that: include: A battery string includes a plurality of battery cells, wherein the plurality of battery cells are distributed along a first direction; a plurality of fine grids disposed on the cell, the fine grids comprising a plurality of first fine grids and a plurality of second fine grids, the first fine grids and the second fine grids extending along the first direction and alternately disposed along the second direction, the first fine grids and the second fine grids having opposite polarities; A conductive connection structure provided on the cell, the conductive connection structure including a first conductive connection structure and a second conductive connection structure, the first conductive connection structure being provided at an end of the first fine grid and / or the second conductive connection structure being provided at an end of the second fine grid; a plurality of welding strips provided on the battery cell, the welding strips extending along the third direction and arranged at intervals along the second direction, the welding strips covering or partially covering the first fine grid and the second fine grid, and being electrically connected to the first fine grid and the second fine grid; There is at least one welding strip covering or partially covering the first fine grid and the first conductive connection structure, and electrically connected to the first fine grid and the first conductive connection structure; there is at least one welding strip covering or partially covering the second fine grid and the second conductive connection structure, and electrically connected to the second fine grid and the second conductive connection structure; Wherein, the angle between the first direction and the third direction is an acute angle.

2. The solar cell according to claim 1, wherein The battery cell includes a first battery cell and a second battery cell, the first fine grid of the first battery cell and the second fine grid of the second battery cell are arranged in a one-to-one correspondence, and the welding ribbon includes a first welding ribbon and a second welding ribbon, the first welding ribbon connects the first fine grid of the first battery cell and the first conductive connection structure and the second fine grid and the second conductive connection structure of the second battery cell, and the second welding ribbon connects the first fine grid and the first conductive connection structure of the second battery cell and the part to be connected.

3. The solar cell according to claim 2, wherein The component to be connected is the second fine grid or bus bar of another adjacent first battery cell.

4. The solar cell according to claim 1, wherein In the second direction, a distance between adjacent first conductive connection structures and second conductive connection structures is 50 μm-400 μm.

5. The solar cell according to claim 1, wherein The battery cell includes a middle area and four edge areas surrounding the middle area; The area of ​​the conductive connection structure located in the edge region is larger than the area of ​​the conductive connection structure in the middle region.

6. The solar cell according to claim 5, characterized in that The edge region includes a first edge region and a second edge region along the first direction, and the edge region also includes a third edge region and a fourth edge region along the second direction, wherein an overlapping area between the first edge region, the third edge region, and the fourth edge region is a first overlapping area, and an overlapping area between the second edge region, the third edge region, and the fourth edge region is a second overlapping area; The area of ​​the conductive connection structure located in the first overlapping region and the second overlapping region is larger than the area of ​​the conductive connection structure in the non-overlapping region in the edge region.

7. The solar cell according to claim 1, wherein The conductive connection structure further includes a plurality of third conductive connection structures and a plurality of fourth conductive connection structures; The third conductive connection structure is arranged at any position in the middle of the first fine grid; The fourth conductive connection structure is arranged at any position in the middle of the second fine grid.

8. The solar cell according to claim 1, wherein The width D of the conductive connection structure along the second direction satisfies the following relationship: 0<D≤(P+2S); Wherein, P is the width of the welding strip along the second direction, and S is the distance between two adjacent welding strips along the second direction.

9. The solar cell according to claim 8, characterized in that The width D of the conductive connection structure along the second direction satisfies the following relationship: 0<D≤(P+S); Wherein, P is the width of the welding strip along the second direction, and S is the distance between two adjacent welding strips along the second direction.

10. The solar cell according to claim 1, wherein The angle α between the first direction and the third direction satisfies the following relationship: 0<tanα≤P / 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 P is the width of the welding ribbon along the second direction.

11. The solar cell according to claim 1, wherein The conductive connection structure is circular, rectangular or triangular.

12. The solar cell according to claim 1, wherein In the second direction, the width of the welding strip is greater than or equal to the width of the fine grid; or In the second direction, the width of the welding strip is smaller than the width of the fine grid.

13. A battery assembly, characterized in that: The solar cell comprises the solar cell according to any one of claims 1 to 12.

14. A photovoltaic system, characterized in that: Comprising the battery assembly as claimed in claim 13.

Images