Solar cell and photovoltaic module

Abstract

The application discloses a solar cell, which is provided with a plurality of fine grids arranged along a first direction and extending along a second direction; wherein the solar cell is further provided with a first connecting area located at at least one edge of the solar cell in the first direction, and a plurality of first reinforcing structures arranged along the second direction are arranged in the first connecting area; the first reinforcing structure comprises a plurality of first reinforcing portions arranged along the first direction, and the plurality of first reinforcing portions are respectively arranged on the fine grids; the width of the first reinforcing portion is W1, the width of the fine grid is W2, W1>W2 is satisfied, and the first direction is perpendicular to the second direction. Compared with the prior art, the reliability of the photovoltaic module is improved.

Description

Technical Field

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

[0002] Solar cells are devices that convert solar energy into electrical energy. They have the advantages of being clean and pollution-free, and have been widely used in the power generation industry.

[0003] Currently, in order to improve the connection strength between the solder ribbon and the solar cell, the main grid on the solar cell generally has a higher silver content than the fine grid, which increases the manufacturing cost of photovoltaic modules. In order to reduce the manufacturing cost of photovoltaic modules, a gridless design or a design that retains only a part of the main grid is generally adopted. However, due to the low connection strength between the edge of the solar cell and the solder ribbon, such a solar cell structure is prone to detachment from the edge of the solar cell and the solder ribbon when the solar cell is subjected to external forces during transportation, lamination and other processes, which affects the reliability of the photovoltaic module. Utility Model Content

[0004] This application provides a solar cell and a photovoltaic module that can solve the problem that the edge of the solar cell is prone to detachment from the solder strip, which leads to a decrease in the reliability of the photovoltaic module.

[0005] In a first aspect, embodiments of this application provide a solar cell, on which a plurality of fine grids arranged along a first direction and extending along a second direction are disposed; wherein, the solar cell is further provided with a first connection region, the first connection region being located at least one edge of the solar cell in the first direction, and a plurality of first reinforcing structures arranged along the second direction are disposed within the first connection region, the first reinforcing structures including a plurality of first reinforcing parts arranged along the first direction, the plurality of first reinforcing parts being respectively disposed on the fine grids, the width of the first reinforcing parts being W1, the width of the fine grids being W2, satisfying W1>W2, and the first direction being perpendicular to the second direction.

[0006] In the above technical solution, by setting a first reinforcing part on the fine grid in the first connection area and limiting the width of the first reinforcing part to be greater than the width of the fine grid, the number of connection points between the solder ribbon and the solar cell and the connection area between the solder ribbon and the solar cell can be increased when connecting the solder ribbon to the edge of the solar cell. This improves the connection strength between the solder ribbon and the edge of the solar cell, thereby reducing the probability of the edge of the solar cell falling off from the solder ribbon when the solar cell is subjected to external forces during transportation, lamination, etc., and thus improving the reliability of the photovoltaic module.

[0007] In some embodiments, in a projection plane perpendicular to a third direction, the orthographic projection area of ​​each of the plurality of first reinforcing portions increases sequentially along a first direction toward the edge of the solar cell, and the third direction is perpendicular to the surface of the solar cell.

[0008] In the above technical solution, by setting multiple first reinforcing parts with projected areas that increase sequentially along the first direction and toward the edge of the solar cell, the connection strength requirements between the solder strip and the solar cell can be met, and the raw materials (such as silver paste) for preparing the first reinforcing parts can be saved.

[0009] In some embodiments, along a third direction, the solar cell includes a front side and a back side disposed opposite to each other, a first connection region includes a first connection region a disposed on the front side, and a plurality of first reinforcing structures arranged along a second direction are disposed in the first connection region a; and the first connection region includes a first connection region b disposed on the back side, and a plurality of first reinforcing structures arranged along a second direction are disposed in the first connection region b, the third direction being perpendicular to the surface of the solar cell.

[0010] In the above technical solution, by setting a first connection area a on the front side of the solar cell, and setting a first reinforcing structure in the first connection area a, and setting a first connection area b on the back side of the solar cell, and setting a first reinforcing structure in the first connection area b, the first reinforcing structure can be set on both the front and back sides of the solar cell, thus satisfying the requirement of solder strip series connection.

[0011] In some embodiments, the first reinforcing structure in the first connection region a includes N first reinforcing parts, and the first reinforcing structure in the first connection region b includes M first reinforcing parts, satisfying N < M.

[0012] In the above technical solution, by setting N < M, the number of first reinforcing parts in the first reinforcing structure in the first connecting area a on the front side is less than the number of first reinforcing parts in the first reinforcing structure in the first connecting area b on the back side. This results in the number of connection points between the back side of the solar cell and the solder strip being greater than the number of connection points between the front side of the solar cell and the solder strip. Consequently, the connection strength between the corresponding area on the back side of the solar cell and the solder strip is greater than the connection strength between the corresponding area on the front side of the solar cell and the solder strip, thus satisfying the stress requirements between the back side of the solar cell and the solder strip.

[0013] In some embodiments, the silver content of the first reinforcing portion is greater than the silver content of the fine gate.

[0014] In the above technical solution, by setting the silver content of the first reinforcing part to be greater than that of the fine grid, since silver is a metal with good electrical conductivity, increasing the silver content in the first reinforcing part can reduce the resistance of the first reinforcing part, thereby improving the current transmission efficiency of the first reinforcing part. At the same time, since silver particles melt and form a dense conductive network when sintered at high temperature, increasing the silver content in the first reinforcing part can make the metal structure formed after high-temperature sintering of the first reinforcing part more continuous and have higher mechanical strength when the solder strip is welded to the first reinforcing part.

[0015] In some embodiments, the solar cell is further provided with a second connection region arranged along a first direction. The second connection region is located in the middle of the solar cell. A plurality of second reinforcing structures arranged along a second direction are provided in the second connection region. The plurality of second reinforcing structures correspond one-to-one with a plurality of first reinforcing structures. The second reinforcing structure includes a second reinforcing part arranged along a plurality of first directions. The plurality of second reinforcing parts are respectively disposed on a fine grid. The width of the second reinforcing part is W3 and the width of the fine grid is W2, satisfying W3 > W2.

[0016] In the above technical solution, by setting a second connection area at the center of the solar cell, and setting a second reinforcing structure composed of second reinforcing parts within the second connection area, the solder ribbon can be directly welded to the second reinforcing parts when connecting to the second connection area of ​​the solar cell. The addition of the second reinforcing parts effectively increases the number of connection points between the solder ribbon and the second connection area. Furthermore, by setting the width of the second reinforcing parts to be greater than the width of the fine grid, the connection area between the solder ribbon and the second reinforcing parts is increased when welding the solder ribbon to the second reinforcing parts. Therefore, by increasing the number of connection points and the connection area, the connection strength between the solder ribbon and the second connection area of ​​the solar cell is improved. Through the combined action of the first and second reinforcing parts, the connection strength between the solder ribbon and the solar cell is further enhanced.

[0017] In some embodiments, the silver content of the second reinforcing portion is greater than the silver content of the fine gate.

[0018] In the above technical solution, by setting the silver content of the second reinforcing part to be greater than the silver content of the fine grid, since silver is a metal with good conductivity, increasing the silver content in the second reinforcing part can reduce the resistance of the second reinforcing part, thereby improving the current transmission efficiency of the second reinforcing part. At the same time, since silver particles melt and form a dense conductive network when sintered at high temperature, increasing the silver content in the second reinforcing part can make the metal structure formed after high-temperature sintering of the second reinforcing part more continuous and have higher mechanical strength when the solder strip is welded to the second reinforcing part.

[0019] In some embodiments, along the second direction, the two sides of the solar cell are respectively a first edge and a second edge. A first main grid is provided on a first reinforcing structure near the first edge and a first main grid is provided on a first reinforcing structure near the second edge. The first main grid extends continuously along the first direction. The first main grid is connected to a fine grid, and no first main grid is provided between the first main grids.

[0020] In the above technical solution, first main grids are respectively provided on the first reinforcing structure near the first edge and the first reinforcing structure near the second edge, and the first main grids extend along the first direction. The first main grids are respectively connected to the fine grids, which increases the connection area between the solder ribbon and the first edge and the second edge, thereby further improving the connection strength between the solder ribbon and the edge of the solar cell. This reduces the probability of the solder ribbon detaching from the first edge and the second edge of the solar cell when adjacent solar cells rotate relative to each other. At the same time, by not providing a first main grid between the two first main grids, the use of raw materials (such as silver paste) for preparing the first main grids is reduced.

[0021] In some embodiments, the two ends of the first main grid are respectively connected to the first reinforcing portion of the first reinforcing structure at the end furthest from the edge of the solar cell.

[0022] In the above technical solution, by connecting the two ends of the first main grid to the first reinforcing part respectively, the connection between the first main grid and the solar cell is made more reliable, and the connection strength between the solder strip and the edge of the solar cell is further improved, thereby further reducing the probability that the solder strip will fall off from the first edge and the second edge of the solar cell respectively when the adjacent solar cells rotate relative to each other.

[0023] In some embodiments, along the second direction, a second main grid is further disposed between the first main grids, and the second main grids correspond one-to-one with the first reinforcing structure. The second main grid includes a plurality of second main grids a disposed at intervals along the first direction.

[0024] In the above technical solution, by setting a second main grid consisting of a second main grid a between the first main grids, the connection area between the solder ribbon and other areas of the solar cell can be increased through the second main grid, thereby further improving the connection strength between the solder ribbon and other areas of the solar cell, while reducing the use of raw materials (such as silver paste) for preparing the second main grid.

[0025] In some embodiments, the solar cell is provided with a first main grid and a second main grid arranged alternately along a second direction. The first main grid and the second main grid correspond one-to-one with the first reinforcing structure. The first main grid extends along the first direction and is connected to the fine grid. The second main grid includes a plurality of second main grids a arranged at intervals along the first direction.

[0026] In the above technical solution, by alternately setting the first main grid and the second main grid, the connection area between the solder ribbon and the corresponding area of ​​the solar cell can be effectively increased, thereby further improving the connection strength between the solder ribbon and the corresponding area of ​​the solar cell. At the same time, setting the second main grid to be composed of the second main grid a can further reduce the use of raw materials (such as silver paste) for preparing the second main grid while ensuring strength.

[0027] In some embodiments, a first main grid is provided on the solar cell along a second direction, the first main grid extends along a first direction, the first main grid is connected to a fine grid, and at least one first reinforcing structure is spaced between two adjacent first main grids, and the first main grid corresponds one-to-one with the first reinforcing structure.

[0028] In the above technical solution, by arranging the first main grids sequentially along the second direction on the solar cell, with at least one first reinforcing structure between two adjacent first main grids, the solar cell forms an alternating structure of first main grids and gridless grids along the second direction. The first main grids can effectively increase the connection area between the solder ribbon and the corresponding area of ​​the solar cell, thereby further improving the connection strength between the solder ribbon and the corresponding area of ​​the solar cell. At the same time, the gridless design can further reduce the use of raw materials (such as silver paste) for preparing the first main grids while ensuring strength.

[0029] In some embodiments, a plurality of harpoon structures arranged along a second direction are further provided in the first connection area. The plurality of harpoon structures correspond one-to-one with a plurality of first reinforcing structures. The harpoon structures are used to collect the current of the fine grid. The harpoon structure includes a first connecting line and a second connecting line arranged along the second direction. Both the first connecting line and the second connecting line extend from the inner side of the solar cell to the edge of the solar cell. There is a first region between the first connecting line and the second connecting line. At least part of the fine grid passes through the first region. The first reinforcing structure is located in the first region.

[0030] In the above technical solution, a harpoon structure composed of a first connecting line and a second connecting line is set in the first connection area located at the edge of the solar cell. The current on the fine grid is led out through the harpoon structure and thus the current transmission effect in the edge area of ​​the solar cell is improved.

[0031] Secondly, embodiments of this application provide a solar cell including any one of the embodiments of the first aspect, wherein multiple solar cells are arranged and connected in series along a first direction.

[0032] In some embodiments, the system further includes a solder strip comprising a first segment and a second segment, the second segment being flat and connecting the first connection area of ​​the preceding solar cell and the first connection area of ​​the following solar cell in series.

[0033] In the above technical solution, by setting the solder strip to include a first segment and a second segment, and setting the second segment, which connects the first connection area of ​​the previous cell and the first connection area of ​​the next cell in adjacent solar cells, to be flat, the thickness of the second segment can be effectively reduced, thereby reducing the thickness of the edge of the solar cell. This reduces the probability of local stress concentration at the edge of the solar cell, which in turn leads to microcracks at the edge of the solar cell, thereby improving the reliability of the photovoltaic module.

[0034] In some embodiments, the solar cell is further provided with a third connection region arranged along a first direction. The third connection region is located in the middle of the solar cell. The third connection region is provided with a plurality of first adhesive dots arranged along a second direction. The plurality of first adhesive dots correspond one-to-one with a plurality of first reinforcing structures. The first adhesive dots bond the solder ribbon to the solar cell. The first adhesive dots include a plurality of first adhesive dots arranged along the first direction.

[0035] In the above technical solution, by setting multiple first adhesive dots on the solar cell along the second direction, each corresponding to a first reinforcing structure, and the first adhesive dot structure including multiple first adhesive dots arranged along the first direction, the solder ribbon can be bonded to the solar cell due to the adhesive properties of the first adhesive dots. This provides additional adhesive bonding force between the solder ribbon and the corresponding area of ​​the solar cell, thereby improving the connection stability between the solder ribbon and the corresponding area of ​​the solar cell, reducing phenomena such as solder ribbon misalignment and desoldering, and thus improving the reliability of the photovoltaic module.

[0036] In some embodiments, along the first direction, the width of the first adhesive dot is D1, and the minimum distance between adjacent fine grids in the fine grid is D2, satisfying D1 < D2.

[0037] In the above technical solution, by setting D1 < D2, the first adhesive dot is located between two adjacent fine grids, so that the first adhesive dot can be in complete contact with the surface of the solar cell, thereby improving the bonding force between the first adhesive dot and the solar cell and further improving the reinforcement effect of the first adhesive dot on the solder ribbon.

[0038] In some embodiments, along the first direction, the maximum distance between adjacent first adhesive dots is D3, which satisfies D3 < 30 mm.

[0039] In the above technical solution, by setting D3 < 30mm, the tension applied to the solder ribbon between adjacent first adhesive dots can be effectively guaranteed, reducing the probability of the solder ribbon moving when the adhesive film melts and flows, thereby improving the reliability of the photovoltaic module.

[0040] In some embodiments, along the first direction, a second adhesive dot is further provided between adjacent first reinforcing portions in the first reinforcing structure.

[0041] In the above technical solution, by providing a second adhesive dot between adjacent first reinforcing parts, the connection between the solder ribbon and the edge of the solar cell can be further strengthened through the combined action of the second adhesive dot and the first reinforcing part. Attached Figure Description

[0042] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 Structural diagrams of solar cells provided in some embodiments of this application;

[0044] Figure 2 Structural diagrams of solar cells provided in other embodiments of this application;

[0045] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0046] Figure 4 Structural diagrams of solar cells provided in some embodiments of this application;

[0047] Figure 5 This is a structural diagram of the front side of a solar cell provided in some embodiments of this application;

[0048] Figure 6 This application provides structural diagrams of the back side of a solar cell according to some embodiments;

[0049] Figure 7 Structural diagrams of solar cells provided for some embodiments of this application (showing a second reinforcing structure);

[0050] Figure 8 for Figure 7 A magnified view of a portion of point B in the middle;

[0051] Figure 9A structural diagram of a solar cell provided for some embodiments of this application (showing a first main grid);

[0052] Figure 10 Structural diagrams of solar cells provided for some embodiments of this application (showing a first main grid and a second main grid);

[0053] Figure 11 Structural diagrams of solar cells provided for other embodiments of this application (showing a first main grid and a second main grid);

[0054] Figure 12 A structural diagram of a solar cell provided for other embodiments of this application (showing a first main grid);

[0055] Figure 13 Structural diagram of a solar cell provided for other embodiments of this application (showing a harpoon structure).

[0056] Figure 14 The diagram shows the structure of a photovoltaic module provided in some embodiments of this application.

[0057] Figure 15 A structural diagram of a solar cell provided for some embodiments of this application (showing the structure of the first adhesive dot);

[0058] Figure 16 for Figure 15 A magnified view of a portion of point C in the middle;

[0059] Figure 17 A structural diagram of a solar cell provided for some embodiments of this application (showing a second adhesive dot);

[0060] icon:

[0061] 1000-Photovoltaic Modules

[0062] 100 - Solar cell, 110 - Previous cell, 120 - Next cell;

[0063] 101-Front side, 102-Back side, 103-First edge, 104-Second edge, 11-Fine grid, 12-First connecting area, 121-First connecting area a, 122-First connecting area b, 13-First reinforcing structure, 131-First reinforcing part, 131a-First reinforcing part a, 131b-First reinforcing part b, 131c-First reinforcing part c, 14-Second reinforcing structure, 141-Second reinforcing part, 15-Second connecting area, 16-First main grid, 17-Second main grid, 171-Second main grid a, 18-Harpoon structure, 181-First connecting line, 182-Second connecting line, 183-First area, 19-Third connecting area, 20-First glue dot structure, 201-First glue dot, 21-Second glue dot;

[0064] 200 - Welding strip, 210 - First section, 220 - Second section;

[0065] X - First direction, Y - Second direction, Z - Third direction. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0068] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication 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.

[0070] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0071] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0072] Solar cells are devices that convert solar energy into electrical energy. They have the advantages of being clean and pollution-free, and have been widely used in the power generation industry.

[0073] Currently, in order to improve the connection strength between the solder ribbon and the solar cell, the main grid on the solar cell generally has a higher silver content than the fine grid, which increases the manufacturing cost of photovoltaic modules. In order to reduce the manufacturing cost of photovoltaic modules, a gridless design or a design that retains only a part of the main grid is generally adopted. However, due to the low connection strength between the edge of the solar cell and the solder ribbon, such a solar cell structure is prone to detachment from the edge of the solar cell and the solder ribbon when the solar cell is subjected to external forces during transportation, lamination and other processes, which affects the reliability of the photovoltaic module.

[0074] Based on the above considerations, in order to solve the problem that the edge of the solar cell is prone to detachment from the solder strip, which leads to a decrease in the reliability of the photovoltaic module, this application provides a solar cell, characterized in that the solar cell is provided with a plurality of fine grids arranged along a first direction and extending along a second direction; wherein, the solar cell is also provided with a first connection area, the first connection area is located at at least one edge of the solar cell in the first direction, the first connection area is provided with a plurality of first reinforcing structures arranged along the second direction, the first reinforcing structure includes a plurality of first reinforcing parts arranged along the first direction, the plurality of first reinforcing parts are respectively disposed on the fine grids, the width of the first reinforcing part is W1, the width of the fine grid is W2, satisfying W1>W2, and the first direction is perpendicular to the second direction.

[0075] In this type of solar cell, a first connection area is located at the edge of the solar cell, and a first reinforcing structure arranged along a second direction is provided within the first connection area. This first reinforcing structure includes a first reinforcing portion disposed on a fine grid. This allows the solder ribbon to be directly welded to the first reinforcing portion when connecting to the edge of the solar cell. The inclusion of the first reinforcing portion effectively increases the number of connection points between the solder ribbon and the edge of the solar cell. Furthermore, by setting W1 > W2, the first reinforcing portion has a larger size, thus increasing the connection area between the solder ribbon and the first reinforcing portion when welding them. Therefore, by increasing the number of connection points and the connection area, the connection strength between the solder ribbon and the edge of the solar cell is improved, thereby reducing the probability of detachment between the edge of the solar cell and the solder ribbon when the solar cell is subjected to external forces during transportation, lamination, etc., thus improving the reliability of the photovoltaic module.

[0076] Please refer to Figures 1-3 , Figure 1 Structural diagrams of solar cells provided in some embodiments of this application; Figure 2 Structural diagrams of solar cells provided in other embodiments of this application; Figure 3 for Figure 2 A partially enlarged schematic diagram at point A. This application provides a solar cell 100, which has multiple fine grids 11 arranged along a first direction X and extending along a second direction Y. The solar cell 100 also has a first connection region 12 located at at least one edge of the solar cell 100 in the first direction X. The first connection region 12 contains multiple first reinforcing structures 13 arranged along the second direction Y. Each first reinforcing structure 13 includes multiple first reinforcing portions 131 arranged along the first direction X. The multiple first reinforcing portions 131 are respectively disposed on the fine grids 11. The width of each first reinforcing portion 131 is W1, and the width of each fine grid 11 is W2, satisfying W1 > W2. The first direction X is perpendicular to the second direction Y.

[0077] The types of solar cells 100 can include emitter-back passivated cells (PERC), tunnel oxide passivated contact cells (TOPCon), intrinsic thin-film heterojunction cells (HJT), interdig-type back contact cells (IBC), perovskite cells, etc.

[0078] The multiple fine grids 11 arranged along the first direction X can be arranged at equal intervals or at unequal intervals.

[0079] The first connection area 12 can be one, and the first connection area 12 can be located at one edge of the solar cell 100 in the first direction X. The first connection area 12 can also be two, and the two first connection areas 12 can be located at two edges of the solar cell 100 in the first direction X, respectively.

[0080] The first reinforcing part 131 can be a PAD point, which can be a metal electrode designed at a specific location on the surface of the solar cell 100. It plays an important role in connecting the solar cell 100 to the conductive element. These points are typically used to connect electrodes and wires, as well as to connect other photovoltaic modules 1000, such as connecting multiple cells in series to form a battery pack, or connecting multiple battery packs in parallel to form a photovoltaic module 1000. The first reinforcing part 131 can also be a solder point, which can be one or more of solder paste points, silver paste points, copper paste points, and silver-copper points.

[0081] In the projection plane perpendicular to the third direction Z, the orthographic projection of the first reinforcing part 131 can be rectangular or circular, wherein the third direction Z can be perpendicular to the surface of the solar cell 100.

[0082] In an embodiment where the orthographic projection of the first reinforcing part 131 is rectangular, the width of the first reinforcing part 131 can be the dimension of the first reinforcing part along the first direction X, and the width of the fine gate 11 can be the dimension of the fine gate 11 along the first direction X.

[0083] In this embodiment, by setting the first connection area 12 at the edge of the solar cell 100, and setting the first reinforcing mechanism arranged along the second direction Y in the first connection area 12, the first reinforcing structure 13 includes a first reinforcing part 131 set on the fine grid 11. In this way, when the solder ribbon 200 is connected to the edge of the solar cell 100, the solder ribbon 200 can be directly welded to the first reinforcing part 131. The setting of the first reinforcing part 131 effectively increases the number of connection points between the solder ribbon 200 and the edge of the solar cell 100. At the same time, by setting W1 > W2, the first reinforcing part 131 has a larger size, which increases the connection area between the solder ribbon 200 and the first reinforcing part 131 when the solder ribbon 200 is welded to the first reinforcing part 131. Therefore, by increasing the number of connection points and the connection area, the connection strength between the solder ribbon 200 and the edge of the solar cell 100 is improved, thereby reducing the probability of the edge of the solar cell 100 falling off from the solder ribbon 200 when the solar cell 100 is subjected to external forces during transportation, lamination and other processes, thereby improving the reliability of the photovoltaic module 1000.

[0084] In some embodiments, please refer to Figure 4 , Figure 4 This is a structural diagram of a solar cell provided in some embodiments of this application. In a projection plane perpendicular to the third direction Z, the projected area of ​​each of the plurality of first reinforcing parts 131 increases sequentially along the first direction X toward the edge of the solar cell 100, wherein the third direction Z is perpendicular to the surface of the solar cell 100.

[0085] In this embodiment, the closer the first connection area 12 is to the edge of the solar cell 100 along the first direction X, the greater the required connection strength between the solder ribbon 200 and the solar cell 100. The increase in the area of ​​the first reinforcing part 131 increases the contact area between the solder ribbon 200 and the first reinforcing part 131 when they are welded, thereby increasing the connection area between the solder ribbon 200 and the first reinforcing part 131 and thus increasing the connection strength between them. At the same time, the reduction in the area of ​​the first reinforcing part 131 reduces the amount of raw materials (e.g., silver paste) used to prepare the first reinforcing part 131. Therefore, by setting multiple first reinforcing parts 131 with their projected areas increasing sequentially along the first direction X toward the edge of the solar cell 100, the connection strength requirements between the solder ribbon 200 and the solar cell 100 can be met, and the raw materials (e.g., silver paste) used to prepare the first reinforcing part 131 can be saved.

[0086] In some embodiments, please continue to refer to Figure 4 The first reinforcing part 131 includes a first reinforcing part a131 a, a first reinforcing part b131 b and a first reinforcing part c131 c. In the projection plane perpendicular to the third direction Z, the orthographic projection area of ​​the first reinforcing part a131 a is S1, the orthographic projection area of ​​the first reinforcing part b131 b is S2 and the orthographic projection area of ​​the first reinforcing part c131 c is S3, satisfying S1 < S2 < S3.

[0087] In the projection plane perpendicular to the third direction Z, the orthographic projection of the first reinforcing part a131 a can be a rectangle or a circle, the orthographic projection of the first reinforcing part b131 b can be a rectangle or a circle, and the orthographic projection of the first reinforcing part c131 c can be a rectangle or a circle.

[0088] In embodiments where the orthographic projection of the first reinforcing part a131a is rectangular, the orthographic projection of the first reinforcing part b131b is rectangular, and the orthographic projection of the first reinforcing part c131c is rectangular, the width of the first reinforcing part a131a along the first direction X is W. a The width of the first reinforcing part b131 b is W.b The width of the first reinforcing part c131 is W. c Along the second direction Y, the length of the first reinforcing part a131 a is L. a The length of the first reinforcing part b131 b is L. b The length of the first reinforcing part c131 is L. c The orthographic projection area S1 of the first reinforcing part a131 can be S1 = W a ×L a The projected area S2 of the first reinforcing part b131 can be S2 = W b ×L b The orthographic projection area S3 of the first reinforcing part c131 can be S3 = W c ×L c .

[0089] In this embodiment, by setting S1 < S2 < S3, the projected areas of the first reinforcing part a131 a, the first reinforcing part b131 b, and the first reinforcing part c131 c increase sequentially along the first direction X toward the edge of the solar cell 100, thereby satisfying the connection strength requirements between the solder ribbon 200 and the solar cell 100, and saving the raw materials for preparing the first reinforcing part 131.

[0090] In some embodiments, please refer to Figure 5 and Figure 6 , Figure 5 This is a structural diagram of the front side of a solar cell provided in some embodiments of this application; Figure 6 This is a structural diagram of the back side of a solar cell provided in some embodiments of this application. Along the third direction Z, the solar cell 100 includes a front side 101 and a back side 102 disposed opposite to each other. The first connection region 12 includes a first connection region a121 disposed on the front side 101, and a plurality of first reinforcing structures 13 arranged along the second direction Y are disposed within the first connection region a121; and the first connection region 12 includes a first connection region b122 disposed on the back side 102, and a plurality of first reinforcing structures 13 arranged along the second direction Y are disposed within the first connection region b122. The third direction Z is perpendicular to the surface of the solar cell 100.

[0091] The first connecting region a121 can be one, and the first connecting region a121 can be located at one edge of the front 101 in the first direction X. The first connecting region a121 can also be two, and the two first connecting regions a121 can be located at two edges of the front 101 in the first direction X, respectively.

[0092] The first connecting region b122 can be one, and the first connecting region b122 can be located at one edge of the back surface 102 in the first direction X. The first connecting region b122 can also be two, and the two first connecting regions b122 can be located at two edges of the back surface 102 in the first direction X, respectively.

[0093] In this embodiment, when the solar cells 100 are connected in series, the solder ribbon 200 between adjacent solar cells 100 is connected from the front 101 of one solar cell 100 to the back 102 of another solar cell 100, and then from the back 102 of another solar cell 100 to the front 101 of the next solar cell 100. Therefore, by setting a first connection area a121 on the front 101 of the solar cell 100, and setting a first reinforcing structure 13 in the first connection area a121, and setting a first connection area b122 on the back 102 of the solar cell 100, and setting a first reinforcing structure 13 in the first connection area b122, the requirement of the solder ribbon 200 being connected in series can be met.

[0094] In some embodiments, please continue to refer to Figure 5 and Figure 6 The first reinforcing structure 13 in the first connecting region a121 includes N first reinforcing parts 131, and the first reinforcing structure 13 in the first connecting region b122 includes M first reinforcing parts 131, satisfying N < M.

[0095] In this embodiment, during the transportation and assembly process of the battery strings in the photovoltaic module 1000, the suction cup adsorbs the back side 102 of the solar cell 100, causing the external force between the back side 102 of the solar cell 100 and the solder ribbon 200 to be greater than the external force between the front side 101 of the solar cell 100 and the solder ribbon 200. Therefore, by setting N < M, the number of first reinforcing parts 131 in the first reinforcing structure 13 in the first connecting area a121 of the front side 101 is less than the number of first reinforcing parts 131 in the first connecting area b122 of the back side 102. The number of first reinforcing parts 131 in the reinforcing structure 13 is increased, thereby making the number of connection points between the back side 102 of the solar cell 100 and the solder ribbon 200 greater than the number of connection points between the front side 101 of the solar cell 100 and the solder ribbon 200. This makes the connection strength between the corresponding area of ​​the back side 102 of the solar cell 100 and the solder ribbon 200 greater than the connection strength between the corresponding area of ​​the front side 101 of the solar cell 100 and the solder ribbon 200, thus meeting the stress requirements between the back side 102 of the solar cell 100 and the solder ribbon 200.

[0096] In some embodiments, the silver content of the first reinforcing portion 131 is greater than the silver content of the fine gate 11.

[0097] The silver content of the first reinforcing part 131 can be the silver content in the silver paste used to prepare the first reinforcing part 131.

[0098] The silver content of the fine grid 11 can be the silver content in the silver paste used to prepare the fine grid 11.

[0099] In this embodiment, by setting the silver content of the first reinforcing part 131 to be greater than the silver content of the fine grid 11, since silver is a metal with good electrical conductivity, increasing the silver content in the first reinforcing part 131 can reduce the resistance of the first reinforcing part 131, thereby improving the current transmission efficiency of the first reinforcing part 131. At the same time, since silver particles melt and form a dense conductive network when sintered at high temperature, increasing the silver content in the first reinforcing part 131 can make the metal structure formed after high-temperature sintering of the first reinforcing part 131 more continuous and have higher mechanical strength when the solder ribbon 200 is welded to the first reinforcing part 131.

[0100] In some embodiments, please refer to Figure 7 and Figure 8 , Figure 7 Structural diagrams of solar cells provided for some embodiments of this application (showing a second reinforcing structure); Figure 8 for Figure 7 A partially enlarged schematic diagram at point B. The solar cell 100 also has a second connection region 15 arranged along the first direction X. The second connection region 15 is located in the middle of the solar cell 100. Multiple second reinforcing structures 14 arranged along the second direction Y are disposed within the second connection region 15. Each of the multiple second reinforcing structures 14 corresponds one-to-one with a multiple of the first reinforcing structures 13. Each second reinforcing structure 14 includes a second reinforcing part 141 arranged along the multiple first directions X. The multiple second reinforcing parts 141 are respectively disposed on the fine grid 11. The width of the second reinforcing part 141 is W3, and the width of the fine grid 11 is W2, satisfying W3 > W2.

[0101] In an embodiment where there are two first connection regions 12, and the two first connection regions 12 are respectively located at two edges of the solar cell 100 in the first direction X, the second connection region 15 may be located between the two first connection regions 12 along the first direction X.

[0102] The multiple second reinforcing structures 14 correspond one-to-one with the multiple first reinforcing structures 13. Each group of second reinforcing structures 14 in the second reinforcing structures 14 is set to correspond one-to-one with each group of first reinforcing structures 13 in the first reinforcing structures 13. Each group of second reinforcing structures 14 and each group of first reinforcing structures 13 are located in the first direction X.

[0103] The second reinforcing part 141 can be a PAD point, which can be a metal electrode designed at a specific location on the surface of the solar cell 100. It plays an important role in connecting the solar cell 100 to the conductive element. These points are typically used to connect electrodes and wires, as well as to connect other photovoltaic modules 1000, such as connecting multiple cells in series to form a battery pack, or connecting multiple battery packs in parallel to form a photovoltaic module 1000. The second reinforcing part 141 can also be a solder point, which can be one or more of solder paste points, silver paste points, copper paste points, and silver-copper points.

[0104] In the projection plane perpendicular to the third direction Z, the orthographic projection of the second reinforcing part 141 can be rectangular or circular, wherein the third direction Z can be perpendicular to the surface of the solar cell 100.

[0105] In an embodiment where the orthographic projection of the second reinforcing portion 141 is rectangular, the width of the second reinforcing portion 141 can be the dimension of the second reinforcing portion along the first direction X, and the width of the fine gate 11 can be the dimension of the fine gate 11 along the first direction X.

[0106] In this embodiment, a second connection region 15 is provided at the center of the solar cell 100, and a second reinforcing structure 14 composed of second reinforcing parts 141 is provided within the second connection region 15. This allows the solder ribbon 200 to be directly soldered to the second reinforcing part 141 when connecting to the second connection region 15 of the solar cell 100. The provision of the second reinforcing part 141 effectively increases the number of connection points between the solder ribbon 200 and the second connection region 15. Furthermore, by making the width of the second reinforcing part 141 greater than the width of the fine grid 11, the connection area between the solder ribbon 200 and the second reinforcing part 141 is increased when soldering the solder ribbon 200 to the second reinforcing part 141. Therefore, the increased number of connection points and the increased connection area improve the connection strength between the solder ribbon 200 and the second connection region 15 of the solar cell 100. The combined action of the first reinforcing part 131 and the second reinforcing part 141 further enhances the connection strength between the solder ribbon 200 and the solar cell 100.

[0107] In some embodiments, the silver content of the second reinforcing portion 141 is greater than the silver content of the fine gate 11.

[0108] The silver content of the second reinforcing part 141 can be the silver content in the silver paste used to prepare the second reinforcing part 141.

[0109] The silver content of the fine grid 11 can be the silver content in the silver paste used to prepare the fine grid 11.

[0110] In this embodiment, by setting the silver content of the second reinforcing part 141 to be greater than the silver content of the fine grid 11, since silver is a metal with good electrical conductivity, increasing the silver content in the second reinforcing part 141 can reduce the resistance of the second reinforcing part 141, thereby improving the current transmission efficiency of the second reinforcing part 141. At the same time, since silver particles melt and form a dense conductive network when sintered at high temperature, increasing the silver content in the second reinforcing part 141 can make the metal structure formed after high-temperature sintering of the second reinforcing part 141 more continuous and have higher mechanical strength when the solder ribbon 200 is welded to the second reinforcing part 141.

[0111] In some embodiments, please refer to Figure 9 , Figure 9 This is a structural diagram of a solar cell provided in some embodiments of this application (showing a first main grid). Along the second direction Y, the two sides of the solar cell 100 are a first edge 103 and a second edge 104, respectively. A first main grid 16 is provided on a first reinforcing structure 13 near the first edge 103 and on a first reinforcing structure 13 near the second edge 104. The first main grid 16 extends continuously along the first direction X. The first main grid 16 is connected to the fine grid 11 respectively, and no first main grid 16 is provided between the first main grids 16.

[0112] Both ends of the first main grid 16 can be connected to the first reinforcing structure 13 corresponding to the first main grid 16, and both ends of the first main grid 16 can also be not connected to the first reinforcing structure 13 corresponding to the first main grid 16. The first main grid 16 can also be connected to all the first reinforcing parts 131 in the first reinforcing structure 13 in the first edge 103, and the first main grid 16 can also be connected to all the first reinforcing parts 131 in the first reinforcing structure 13 in the second edge 104.

[0113] In this embodiment, after the solar cells 100 are assembled into a battery string, during the transportation process, two adjacent solar cells 100 may rotate relative to the central axis of the solar cells 100. At this time, the torsional force on the solder ribbons 200 on the first edge 103 and the second edge 104 of the solar cells 100 is the greatest. Therefore, by setting the first main grid 16 on the first reinforcing structure 13 near the first edge 103 and the first reinforcing structure 13 near the second edge 104 respectively, and setting the first main grid 16 to extend along the first direction X, the first main grid 16 is connected to the fine grid 11 respectively, so that the first main grid 16 can increase the connection area between the solder ribbons 200 and the first edge 103 and the second edge 104 respectively, thereby further improving the connection strength between the solder ribbons 200 and the edge of the solar cells 100, thereby reducing the probability of the solder ribbons 200 falling off from the first edge 103 and the second edge 104 of the solar cells 100 when the adjacent solar cells 100 rotate relative to each other. At the same time, by not setting the first main gate 16 between the two first main gates 16, the use of raw materials (such as silver paste) for preparing the first main gate 16 is reduced.

[0114] In some embodiments, please continue to refer to Figure 9 The two ends of the first main grid 16 are respectively connected to the first connecting portion of the first reinforcing structure 13 at the end away from the edge of the solar cell 100.

[0115] In this embodiment, by connecting the two ends of the first main grid 16 to the first reinforcing part 131 respectively, the connection between the first main grid 16 and the solar cell 100 is made more reliable, which further improves the connection strength between the solder ribbon 200 and the edge of the solar cell 100, thereby further reducing the probability that the solder ribbon 200 will fall off from the first edge 103 and the second edge 104 of the solar cell 100 when the adjacent solar cells 100 rotate relative to each other.

[0116] In some embodiments, please refer to Figure 10 , Figure 10 The diagram shows the structure of a solar cell provided in some embodiments of this application (showing a first main grid and a second main grid). Along the second direction Y, a second main grid 17 is further disposed between the first main grids 16, and the second main grids 17 correspond one-to-one with the first reinforcing structure 13. The second main grid 17 includes a plurality of second main grids a171 disposed at intervals along the first direction X.

[0117] The multiple second main gates 17 are respectively associated with the multiple first reinforcing structures 13. Each group of second main gates 17 is respectively associated with each group of first reinforcing structures 13. Each group of second main gates 17 and each group of first reinforcing structures 13 are located in the first direction X.

[0118] Both ends of the second main gate 17 can be connected to the first reinforcing structure 13 corresponding to the second main gate 17, and both ends of the second main gate 17 can also be not connected to the first reinforcing structure 13 corresponding to the second main gate 17.

[0119] In an embodiment where the two ends of the second main gate 17 can be connected to the first reinforcing structure 13 corresponding to the second main gate 17, the two ends of the second main gate 17 are respectively connected to the first reinforcing part 131 near the end of the second main gate 17 in the first reinforcing structure 13.

[0120] In this embodiment, by providing a second main grid 17 composed of a second main grid a171 between the first main grids 16, the connection area between the solder ribbon 200 and other areas of the solar cell 100 can be increased by the second main grid 17, thereby further improving the connection strength between the solder ribbon 200 and other areas of the solar cell 100, while reducing the use of raw materials (such as silver paste) for preparing the second main grid 17.

[0121] In some embodiments, please refer to Figure 11 , Figure 11 The following is a structural diagram of a solar cell provided in some other embodiments of this application (showing a first main grid and a second main grid). The solar cell 100 is provided with a first main grid 16 and a second main grid 17 alternately arranged along the second direction Y. The first main grid 16 and the second main grid 17 correspond one-to-one with the first reinforcing structure 13. The first main grid 16 extends along the first direction X and is connected to the fine grid 11. The second main grid 17 includes a plurality of second main grids a171 spaced apart along the first direction X.

[0122] The multiple first main gates 16 are respectively associated with the multiple first reinforcing structures 13. Each group of first main gates 16 in the first main gates 16 is respectively associated with each group of first reinforcing structures 13 in the first reinforcing structures 13. Each group of first main gates 16 and each group of first reinforcing structures 13 are located in the first direction X.

[0123] Both ends of the first main gate 16 can be connected to the first reinforcing structure 13 corresponding to the first main gate 16, and both ends of the first main gate 16 can also be not connected to the first reinforcing structure 13 corresponding to the first main gate 16.

[0124] In an embodiment where the two ends of the first main gate 16 are respectively connected to the first reinforcing structure 13 corresponding to the first main gate 16, the two ends of the first main gate 16 are respectively connected to the first reinforcing part 131 near the end of the first main gate 16 in the first reinforcing structure 13.

[0125] The multiple second main gates 17 are respectively associated with the multiple first reinforcing structures 13. Each group of second main gates 17 is respectively associated with each group of first reinforcing structures 13. Each group of second main gates 17 and each group of first reinforcing structures 13 are located in the first direction X.

[0126] Both ends of the second main grid 17 can be connected to the first reinforcing structure 13 corresponding to the second main grid 17, and both ends of the second main grid 17 can also be connected to the first reinforcing rib structure not corresponding to the second main grid 17.

[0127] In an embodiment where the two ends of the second main gate 17 are respectively connected to the first reinforcing structure 13 corresponding to the second main gate 17, the two ends of the second main gate 17 are respectively connected to the first reinforcing part 131 near the end of the second main gate 17 in the first reinforcing structure 13.

[0128] In this embodiment, by alternately setting the first main grid 16 and the second main grid 17, the connection area between the solder ribbon 200 and the corresponding area of ​​the solar cell 100 can be effectively increased, thereby further improving the connection strength between the solder ribbon 200 and the corresponding area of ​​the solar cell 100. At the same time, setting the second main grid 17 to be composed of the second main grid a171 can further reduce the use of raw materials (such as silver paste) for preparing the second main grid 17 while ensuring strength.

[0129] In some embodiments, please refer to Figure 12 , Figure 12 The following is a structural diagram of a solar cell provided in some other embodiments of this application (showing a first main grid). The solar cell 100 is provided with first main grids 16 arranged sequentially along the second direction Y. The first main grids 16 extend along the first direction X. The first main grids 16 are respectively connected to the fine grids 11. At least one first reinforcing structure 13 is spaced between two adjacent first main grids 16. The first main grids 16 correspond one-to-one with the first reinforcing structure 13.

[0130] The multiple first main gates 16 are respectively associated with the multiple first reinforcing structures 13. Each group of first main gates 16 in the first main gates 16 is respectively associated with each group of first reinforcing structures 13 in the first reinforcing structures 13. Each group of first main gates 16 and each group of first reinforcing structures 13 are located in the first direction X.

[0131] Both ends of the first main gate 16 can be connected to the first reinforcing structure 13 corresponding to the first main gate 16, and both ends of the first main gate 16 can also be not connected to the first reinforcing structure 13 corresponding to the first main gate 16.

[0132] In an embodiment where the two ends of the first main gate 16 are respectively connected to the first reinforcing structure 13 corresponding to the first main gate 16, the two ends of the first main gate 16 are respectively connected to the first reinforcing part 131 near the end of the first main gate 16 in the first reinforcing structure 13.

[0133] In this embodiment, by arranging the first main grids 16 sequentially along the second direction Y on the solar cell 100, with at least one first reinforcing structure 13 between adjacent first main grids 16, the solar cell 100 forms an alternating structure of first main grids 16 and gridless structure along the second direction Y. The first main grids 16 can effectively increase the connection area between the solder ribbon 200 and the corresponding area of ​​the solar cell 100, thereby further improving the connection strength between the solder ribbon 200 and the corresponding area of ​​the solar cell 100. At the same time, the gridless design can further reduce the use of raw materials (such as silver paste) for preparing the first main grids 16 while ensuring strength.

[0134] In some embodiments, please refer to Figure 13 , Figure 13 The diagram shows the structure of a solar cell provided in other embodiments of this application (showing a harpoon structure). A plurality of harpoon structures 18 arranged along the second direction Y are further provided within the first connection region 12. Each of the harpoon structures 18 corresponds one-to-one with a plurality of the first reinforcing structures 13. The harpoon structures 18 are used to collect the current from the fine grid 11. Each harpoon structure 18 includes a first connecting line 181 and a second connecting line 182 arranged along the second direction Y. Both the first connecting line 181 and the second connecting line 182 extend from the inner side of the solar cell 100 towards the edge of the solar cell 100. A first region 183 exists between the first connecting line 181 and the second connecting line 182. At least a portion of the fine grid 11 passes through the first region 183, and the first reinforcing structure 13 is located within the first region 183.

[0135] The orientation of the first connecting line 181 and the orientation of the second connecting line 182 can be parallel to each other, so that the first connecting line 181 and the second connecting line 182 can form a "U" shape. The orientation of the first connecting line 181 and the orientation of the second connecting line 182 can also intersect, so that the first connecting line 181 and the second connecting line 182 can form a "V" shape.

[0136] The first connecting line 181 and the second connecting line 182 can be spaced apart along the second direction Y, and the first region 183 can be located between the first connecting line 181 and the second connecting line 182.

[0137] At least a portion of the fine grid 11 passing through the first region 183 can be either all the fine grid 11 located at the edge of the solar cell 100 passing through the first region 183, or a portion of the fine grid 11 located at the edge of the solar cell 100 passing through the first region 183.

[0138] In this embodiment, since the fine grid 11 on the edge of the solar cell 100 may break during the printing process, thus affecting the current transmission effect in the edge region of the cell, a harpoon structure 18 composed of a first connecting line 181 and a second connecting line 182 is provided in the first connection area 12 located at the edge of the solar cell 100. The harpoon structure 18 is connected to the fine grid 11 to draw out the current on the fine grid 11, thereby improving the current transmission effect in the edge region of the cell.

[0139] In some embodiments, please refer to Figure 14 , Figure 14 This is a schematic diagram of the structure of a photovoltaic module provided in some embodiments of this application. Embodiments of this application provide a photovoltaic module 1000, including solar cells 100 provided in any of the above embodiments, wherein a plurality of solar cells 100 are arranged along the first direction X and connected in series.

[0140] In some embodiments, please continue to refer to Figure 14 It also includes a solder strip 200, which includes a first segment 210 and a second segment 220. The second segment 220 is flat and connects the first connection area 12 of the preceding solar cell 110 and the first connection area 12 of the following solar cell 120 in adjacent solar cells 100 in series.

[0141] When the welding strip 200 is formed, a wire with a uniform cross-section (here, the cross-section refers to the surface cut along its thickness direction) is used. The wire is cut to a specified length, which is adapted to the length of the welding strip 200. A part of the wire is flattened to form a flat second segment 220, while the rest of the wire retains its original shape, which is the first segment 210.

[0142] The second segment 220 is set in a flat shape, meaning that the thickness of the second segment 220 along the third direction Z is less than the thickness of the first segment 210 along the third direction Z.

[0143] In this embodiment, by setting the solder strip 200 to include a first segment 210 and a second segment 220, and setting the second segment 220, which connects the first connection area 12 of the preceding solar cell 110 and the first connection area 12 of the following solar cell 120 in adjacent solar cells 100 in a series configuration, the thickness of the second segment 220 can be effectively reduced, thereby reducing the thickness of the edge of the solar cell 100. This reduces the probability of local stress concentration at the edge of the solar cell 100, which in turn leads to microcracks at the edge of the solar cell 100, thereby improving the reliability of the photovoltaic module 1000.

[0144] In some embodiments, please continue to refer to Figure 14 Along the third direction Z, the thickness of the first segment 210 is T1, and the thickness of the second segment 220 is T2, satisfying 0.3 < T2 / T1 < 0.8, and the third direction Z is perpendicular to the surface of the solar cell.

[0145] T2 / T1 can be a point value of any one of 0.33, 0.35, 0.38, 0.4, 0.43, 0.45, 0.48, 0.5, 0.53, 0.55, 0.58, 0.6, 0.63, 0.65, 0.68, 0.7, 0.73, 0.75, 0.78, or a range between any two.

[0146] In this embodiment, when the ratio is less than 0.3, the thickness reduction during the flattening process of the solder strip 200 increases, thereby increasing the work hardening degree of the solder strip 200 and increasing its brittleness. This increased brittleness makes the solder strip 200 more prone to breakage during welding bending, thus affecting the reliability of the photovoltaic module 1000. Conversely, when the ratio is greater than 0.8, the thickness reduction during the flattening process of the solder strip 200 is insufficient, resulting in insufficient thickness reduction at the edge of the solar cell 100. This increases the probability of localized stress concentration at the edge of the solar cell 100, leading to microcracks and affecting the reliability of the photovoltaic module 1000. Therefore, by setting 0.3 < T2 / T1 < 0.8, the reliability of the photovoltaic module 1000 can be improved.

[0147] In some embodiments, please continue to refer to Figure 14 Along the third direction Z, the thickness of the second segment 220 is T2, which satisfies T2≤0.08mm.

[0148] T2 can be 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, or 0.08mm.

[0149] In this embodiment, by setting T2≤0.08mm, the thickness of the second segment 220 is further reduced, thereby further reducing the thickness of the edge of the solar cell 100, and further reducing the probability of local stress concentration at the edge of the cell, which may lead to microcracks at the edge of the cell, thereby further improving the reliability of the photovoltaic module 1000.

[0150] In some embodiments, please refer to Figure 15 , Figure 15 The diagram shows the structure of a solar cell provided in some embodiments of this application (showing the first adhesive dot structure). The solar cell 100 also has a third connection region 19 arranged along the first direction X. The third connection region 19 is located in the middle of the solar cell 100. Multiple first adhesive dot structures 20 arranged along the second direction Y are disposed within the third connection region 19. Each of the multiple first adhesive dot structures 20 corresponds one-to-one with a multiple of the first reinforcing structures 13. The first adhesive dot structures 20 bond the solder ribbon 200 to the solar cell 100. Each first adhesive dot structure 20 includes multiple first adhesive dots 201 arranged along the first direction X.

[0151] In an embodiment where there are two first connection regions 12, and the two first connection regions 12 are respectively located at two edges of the solar cell 100 in the first direction X, the third connection region 19 may be located between the two first connection regions 12 along the first direction X.

[0152] The multiple first adhesive dot structures 20 are respectively associated with multiple first reinforcing structures 13. Each group of first adhesive dot structures 20 is respectively associated with each group of first reinforcing structures 13. Each group of first adhesive dot structures 20 and each group of first reinforcing structures 13 are located in the first direction X.

[0153] The first adhesive droplet 201 can be formed by applying photosensitive adhesive to the surface of the solar cell 100 using a dispensing device and then curing it. The photosensitive adhesive can be a UV adhesive (ultraviolet curable adhesive), a visible light curable adhesive, or a near-infrared light curable adhesive, etc.

[0154] In the projection plane perpendicular to the third direction Z, the orthographic projection of the first glue point 201 can be circular or elliptical.

[0155] In this embodiment, by setting multiple first adhesive dot structures 20 corresponding one-to-one with the first reinforcing structure 13 along the second direction Y on the solar cell 100, the first adhesive dot structure 20 includes multiple first adhesive dots 201 arranged along the first direction X. Due to the adhesive characteristics of the first adhesive dots 201, the solder ribbon 200 can be bonded to the solar cell 100, providing additional adhesive bonding force between the solder ribbon 200 and the corresponding area of ​​the solar cell 100, thereby improving the connection stability between the solder ribbon 200 and the corresponding area of ​​the solar cell 100, reducing phenomena such as solder ribbon 200 shifting or desoldering, and thus improving the reliability of the photovoltaic module 1000.

[0156] In some embodiments, please refer to Figure 16 , Figure 16 for Figure 15 A partially enlarged schematic diagram at point C. Along the first direction X, the width of the first adhesive dot 201 is D1, and the minimum distance between adjacent fine grids 11 is D2, satisfying D1 < D2.

[0157] In this embodiment, by setting D1 < D2, the first adhesive dot 201 is located between two adjacent fine grids 11, so that the first adhesive dot 201 can be in complete contact with the surface of the solar cell 100, thereby improving the bonding force between the first adhesive dot 201 and the solar cell 100, and further improving the reinforcement effect of the first adhesive dot 201 on the solder ribbon 200.

[0158] In some embodiments, please continue to refer to Figure 16 Along the first direction X, the maximum distance between adjacent first adhesive dots 201 is D3, which satisfies D3 < 30 mm.

[0159] D3 can be 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, or 29mm.

[0160] In this embodiment, when the spacing between adjacent first adhesive dots 201 is too large, the tension applied to the solder ribbon 200 by the two adjacent first adhesive dots 201 is insufficient. This will cause the solder ribbon 200 to move when the adhesive film melts and flows during the encapsulation process, thereby damaging the connection between the solder ribbon 200 and the fine grid 11. Therefore, by setting D3 < 30mm, the tension applied to the solder ribbon 200 between adjacent first adhesive dots 201 can be effectively guaranteed, reducing the probability of the solder ribbon 200 moving when the adhesive film melts and flows, thereby improving the reliability of the photovoltaic module 1000.

[0161] In some embodiments, please refer to Figure 17 , Figure 17This is a structural diagram of a solar cell provided in some embodiments of this application (showing a second adhesive dot). Along the first direction X, a second adhesive dot 21 is also provided between adjacent first reinforcing portions 131 in the first reinforcing structure 13.

[0162] The second adhesive droplet 21 can be formed by applying photosensitive adhesive to the surface of the solar cell 100 using a dispensing device and then curing it. The photosensitive adhesive can be a UV adhesive (ultraviolet curable adhesive), a visible light curable adhesive, or a near-infrared light curable adhesive, etc.

[0163] In the projection plane perpendicular to the third direction Z, the orthographic projection of the second glue point 21 can be circular or elliptical.

[0164] In this embodiment, by providing a second adhesive dot 21 between adjacent first reinforcing portions 131, the connection strength between the solder ribbon 200 and the edge of the solar cell 100 can be further enhanced through the combined action of the second adhesive dot 21 and the first reinforcing portion 131.

[0165] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0166] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A solar cell, characterized in that, The solar cell is provided with multiple fine grids arranged along a first direction and extending along a second direction; The solar cell is further provided with a first connection area, which is located at least one edge of the solar cell in the first direction. The first connection area is provided with a plurality of first reinforcing structures arranged along the second direction. The first reinforcing structure includes a plurality of first reinforcing parts arranged along the first direction. The plurality of first reinforcing parts are respectively disposed on the fine grid. The width of the first reinforcing part is W1, and the width of the fine grid is W2, satisfying W1 > W2. The first direction is perpendicular to the second direction.

2. The solar cell as described in claim 1, characterized in that, In a projection plane perpendicular to a third direction, the projected area of ​​each of the plurality of first reinforcing parts increases sequentially along the first direction toward the edge of the solar cell, wherein the third direction is perpendicular to the surface of the solar cell.

3. The solar cell as described in claim 1, characterized in that, Along a third direction, the solar cell includes a front side and a back side disposed opposite to each other. The first connection area includes a first connection area a, which is disposed on the front side. The first connection area a contains a plurality of first reinforcing structures arranged along the second direction. The first connection area also includes a first connection area b, which is disposed on the back side. The first connection area b contains a plurality of first reinforcing structures arranged along the second direction. The third direction is perpendicular to the surface of the solar cell.

4. The solar cell as described in claim 3, characterized in that, The first reinforcing structure in the first connection region a includes N first reinforcing parts, and the first reinforcing structure in the first connection region b includes M first reinforcing parts, satisfying N < M.

5. The solar cell as described in claim 1, characterized in that, The silver content of the first reinforcing part is greater than the silver content of the fine gate.

6. The solar cell according to any one of claims 1-5, characterized in that, The solar cell is further provided with a second connection area arranged along the first direction. The second connection area is located in the middle of the solar cell. The second connection area is provided with a plurality of second reinforcing structures arranged along the second direction. The plurality of second reinforcing structures correspond one-to-one with the plurality of first reinforcing structures. The second reinforcing structure includes a second reinforcing part arranged along the plurality of first directions. The plurality of second reinforcing parts are respectively disposed on the fine grid. The width of the second reinforcing part is W3, and the width of the fine grid is W2, satisfying W3 > W2.

7. The solar cell as described in claim 6, characterized in that, The silver content of the second reinforcing part is greater than the silver content of the fine gate.

8. The solar cell according to any one of claims 1-5, characterized in that, Along the second direction, the two sides of the solar cell are respectively a first edge and a second edge. A first main grid is provided on a first reinforcing structure near the first edge and a first main grid is provided on a first reinforcing structure near the second edge. The first main grid extends continuously along the first direction. The first main grid is connected to the fine grid respectively, and no first main grid is provided between the first main grids.

9. The solar cell as described in claim 8, characterized in that, The two ends of the first main grid are respectively connected to the first reinforcing part of the first reinforcing structure at the end away from the edge of the solar cell.

10. The solar cell as described in claim 8, characterized in that, Along the second direction, a second main grid is also provided between the first main grids, and the second main grids correspond one-to-one with the first reinforcing structure. The second main grid includes a plurality of second main grids a that are spaced apart along the first direction.

11. The solar cell according to any one of claims 1-5, characterized in that, The solar cell is provided with a first main grid and a second main grid arranged alternately along the second direction. The first main grid and the second main grid correspond one-to-one with the first reinforcing structure. The first main grid extends along the first direction and is connected to the fine grid. The second main grid includes a plurality of second main grids a arranged at intervals along the first direction.

12. The solar cell according to any one of claims 1-5, characterized in that, The solar cell is provided with first main grids arranged sequentially along the second direction. The first main grids extend along the first direction and are respectively connected to the fine grids. There is at least one first reinforcing structure between two adjacent first main grids. The first main grids correspond one-to-one with the first reinforcing structure.

13. The solar cell according to any one of claims 1-5, characterized in that, The first connection area is further provided with a plurality of harpoon structures arranged along the second direction. Each of the plurality of harpoon structures corresponds one-to-one with a plurality of the first reinforcing structures. The harpoon structures are used to collect the current of the fine grid. Each harpoon structure includes a first connecting line and a second connecting line arranged along the second direction. Both the first connecting line and the second connecting line extend from the inner side of the solar cell to the edge of the solar cell. There is a first region between the first connecting line and the second connecting line. At least part of the fine grid passes through the first region. The first reinforcing structure is located within the first region.

14. A photovoltaic module, characterized in that, The solar cell includes any one of the solar cells as claimed in claims 1-13, wherein a plurality of the solar cells are arranged and connected in series along the first direction.

15. The photovoltaic module as described in claim 14, characterized in that, It also includes a solder strip, which comprises a first segment and a second segment. The second segment is flat and connects the first connection area of ​​the preceding solar cell and the first connection area of ​​the following solar cell in series.

16. The photovoltaic module as described in claim 15, characterized in that, The solar cell is further provided with a third connection area arranged along the first direction. The third connection area is located in the middle of the solar cell. The third connection area is provided with a plurality of first adhesive dots arranged along the second direction. The plurality of first adhesive dots correspond one-to-one with a plurality of first reinforcing structures. The first adhesive dots bond the solder ribbon to the solar cell. The first adhesive dots include a plurality of first adhesive dots arranged along the first direction.

17. The photovoltaic module as described in claim 16, characterized in that, Along the first direction, the width of the first glue dot is D1, and the minimum distance between adjacent fine grids in the fine grid is D2, satisfying D1 < D2.

18. The photovoltaic module as described in claim 16, characterized in that, Along the first direction, the maximum distance between adjacent first adhesive dots is D3, which satisfies D3 < 30 mm.

19. The photovoltaic module as described in claim 14, characterized in that, Along the first direction, a second adhesive dot is also provided between adjacent first reinforcing parts in the first reinforcing structure.

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