Photovoltaic module and method of manufacturing the same

Abstract

The application relates to the photovoltaic technology field and provides a photovoltaic module and a manufacturing method thereof, which can at least improve the reliability of the photovoltaic module. The photovoltaic module comprises the following: a first fine grid and a second fine grid on a cell piece; a first conductive part located on the first fine grid and a second conductive part located on the second fine grid; a first conductive piece and a second conductive piece extending along a second direction, the first conductive piece is located on the first conductive part, the second conductive piece is located on the second conductive part, the first conductive piece is electrically connected with the first fine grid through the first conductive part, and the second conductive piece is electrically connected with the second fine grid through the second conductive part, wherein, along a first direction, the width of the first conductive piece is greater than the width of the first conductive part, and the width of the second conductive piece is greater than the width of the second conductive part; and a supporting adhesive film located on both sides of the first conductive part and the second conductive part along the first direction and between the first conductive piece and the cell piece and between the second conductive piece and the cell piece.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to a photovoltaic module and its manufacturing method. Background Technology

[0002] Currently, with the gradual depletion of fossil fuels, solar cells are becoming increasingly widely used as a new energy alternative. A solar cell is a device that converts solar energy into electrical energy. Solar cells utilize the photovoltaic principle to generate charge carriers, and then use electrodes (grid lines) to extract these carriers, thus facilitating the efficient use of electrical energy.

[0003] IBC (Interdigitated Back Contact) cells refer to a type of solar cell structure in which the positive and negative electrodes are arranged in an interdigitated manner on the back side of the cell. The back junction refers to the pn junction being located on the back side of the cell.

[0004] IBC cells are among the most efficient photovoltaic cells currently available. These cells use monocrystalline silicon as their substrate, p The n-junction and electrodes are located on the back of the cell, with no electrodes on the front to block light, resulting in very high short-circuit current and conversion efficiency. However, the fabrication of IBC photovoltaic modules suffers from relatively low reliability. Summary of the Invention

[0005] This application provides a photovoltaic module and a method for manufacturing the same, which at least helps to improve the reliability of the photovoltaic module.

[0006] This application provides a photovoltaic module, comprising: a solar cell, the solar cell including a first surface and a second surface disposed opposite to each other, the first surface having a first grid and a second grid with different polarities, the first grid and the second grid both extending along a first direction and alternately arranged along a second direction; a first conductive portion and a second conductive portion, the first conductive portion being located on the side of the first grid away from the solar cell, and the second conductive portion being located on the side of the second grid away from the solar cell; a first conductive sheet and a second conductive sheet extending along the second direction, the first conductive sheet being located on the side of the first conductive portion away from the first grid, and the second conductive sheet being located on the side of the second conductive portion away from the second grid, the first conductive sheet being electrically connected to the first grid through the first conductive portion, and the second conductive sheet being electrically connected to the second grid through the second conductive portion, wherein, along the first direction, the width of the first conductive sheet is greater than the width of the first conductive portion, and the width of the second conductive sheet is greater than the width of the second conductive portion; a supporting film, the supporting film being located on both sides of the first conductive portion along the first direction and between the first conductive sheet and the solar cell, and the supporting film also being located on both sides of the second conductive portion along the first direction and between the second conductive sheet and the solar cell.

[0007] Optionally, the melting point of the first conductive part is lower than the melting point of the first conductive sheet; and / or, the melting point of the second conductive part is lower than the melting point of the second conductive sheet.

[0008] Optionally, the material of the first conductive part includes tin, tin-zinc alloy, tin-bismuth alloy, or tin-indium alloy; the material of the second conductive part includes tin, tin-zinc alloy, tin-bismuth alloy, or tin-indium alloy.

[0009] Optionally, the material of the first conductive sheet may include copper, nickel, gold, or silver; the material of the second conductive sheet may include copper, nickel, gold, or silver.

[0010] Optionally, the width of the first conductive sheet along the first direction is W1, and the thickness of the first conductive sheet along the direction perpendicular to the first surface is D1, where W1 and D1 satisfy: 15≤W1 / D1≤300; the width of the second conductive sheet along the first direction is W2, and the thickness of the second conductive sheet along the direction perpendicular to the first surface is D2, where W2 and D2 satisfy: 15≤W2 / D2≤300.

[0011] Optionally, W1 is 2mm~15mm; W2 is 2mm~15mm; D1 is 0.05mm~0.13mm; D2 is 0.05mm~0.13mm.

[0012] Optionally, the first conductive portion extends along the second direction, and / or the second conductive portion extends along the second direction.

[0013] Optionally, it further includes: a first main grid and a second main grid extending along a second direction, the first main grid and the second main grid being alternately arranged along a first direction, each first main grid being electrically connected to a plurality of first fine grids arranged along the second direction, and each second main grid being electrically connected to a plurality of second fine grids arranged along the second direction; the first main grid includes a first body portion and a first welding portion, the width of the first welding portion being greater than the width of the first body portion along the first direction, and a first conductive portion being located on the side of the first welding portion away from the solar cell; the second main grid includes a second body portion and a second welding portion, the width of the second welding portion being greater than the width of the second body portion along the first direction, and a second conductive portion being located on the side of the second welding portion away from the solar cell.

[0014] Optionally, the spacing between adjacent first conductive sheets and second conductive sheets along the first direction is the first spacing, and the spacing between adjacent first fine gates and second fine gates along the second direction is the second spacing, wherein the first spacing is smaller than the second spacing.

[0015] Optionally, the first spacing is 0.2mm to 1mm.

[0016] Optionally, the first conductive sheet includes a first extension at its first end along the second direction, the first extension extending along the first direction, and the first extensions of adjacent first conductive sheets are connected to each other along the first direction; the second conductive sheet includes a second extension at its second end along the second direction, the second extension extending along the first direction, and the second extensions of adjacent second conductive sheets are connected to each other along the first direction.

[0017] Optionally, a first extension on one battery cell is connected to a second extension on another battery cell.

[0018] Optionally, a first conductive sheet on a battery cell is interconnected with a second conductive sheet on another battery cell adjacent to it on one side along the second direction, and the second conductive sheet on the battery cell is interconnected with a first conductive sheet on another battery cell adjacent to it on the other side along the second direction.

[0019] This application also provides a method for manufacturing a photovoltaic module, comprising: providing a solar cell, the solar cell including a first side and a second side disposed opposite to each other, the first side having a first grid and a second grid with different polarities, the first grid and the second grid both extending along a first direction and alternately arranged along a second direction; forming a first conductive portion and a second conductive portion, the first conductive portion being located on the side of the first grid away from the solar cell, and the second conductive portion being located on the side of the second grid away from the solar cell; and laying a support film, the support film being located on both sides of the first conductive portion along the first direction, and also on both sides of the second conductive portion along the first direction. On one side; a first conductive sheet and a second conductive sheet extending along a second direction are laid, the first conductive sheet being located on the side of the first conductive portion away from the first fine grid, and the second conductive sheet being located on the side of the second conductive portion away from the second fine grid. Along the first direction, the width of the first conductive sheet is greater than the width of the first conductive portion, and the width of the second conductive sheet is greater than the width of the second conductive portion. A supporting adhesive film is located between the first conductive sheet and the battery cell and between the second conductive sheet and the battery cell. A lamination process is performed so that the first conductive sheet is electrically connected to the first fine grid through the first conductive portion, and the second conductive sheet is electrically connected to the second fine grid through the second conductive portion.

[0020] Optionally, before lamination, the thickness of the first conductive portion is greater than the thickness of the supporting adhesive film in the direction perpendicular to the first surface, and / or the thickness of the second conductive portion is greater than the thickness of the supporting adhesive film.

[0021] Optionally, before lamination, the distance C1 between the support film and the first conductive part is greater than 0 along the first direction, and / or the distance C2 between the support film and the second conductive part is greater than 0.

[0022] Optionally, C1 is 0.05mm~0.5mm; C2 is 0.05mm~0.5mm.

[0023] Optionally, after laying the first conductive sheet and the second conductive sheet, the method further includes laying a first adhesive film on the side of the first conductive sheet and the second conductive sheet away from the battery cell; wherein, before lamination, the pre-crosslinking degree of the supporting adhesive film is greater than the pre-crosslinking degree of the first adhesive film.

[0024] Optionally, before lamination, the pre-crosslinking degree of the support film is 5% to 30%; and the pre-crosslinking degree of the first film is 0% to 20%.

[0025] The technical solution provided in this application has at least the following advantages:

[0026] In the photovoltaic module provided in this application, the first and second fine grids on the first surface of the cell are arranged in an interdigitated pattern. The first and second fine grids with different polarities are located on the same side surface of the cell, so that there is no grid line obstruction on the second surface, which is beneficial to improving the short-circuit current and conversion efficiency of the cell.

[0027] The first conductive sheet is electrically connected to the first fine grid via a first conductive portion, and the second conductive sheet is electrically connected to the second fine grid via a second conductive portion. The first and second conductive sheets are used to collect the current from the first and second fine grids, respectively. Along the first direction, the width of the first conductive sheet is greater than the width of the first conductive portion, and the width of the second conductive sheet is greater than the width of the second conductive portion. This allows both the first and second conductive sheets to have a large width and a relatively thin thickness. Conventional solutions typically use solder ribbons on the fine grids of the solar cell to collect current. However, due to the large thickness of the solder ribbons, the height difference between the ribbons and the solar cell can be excessive. During the lamination process, uneven filling of the adhesive film can lead to air bubbles. Furthermore, the large thickness of the solder ribbons can increase the risk of uneven stress on the solar cell, potentially causing fragmentation. The first and second conductive sheets have a large width and a thin thickness. This allows for a reduction in the total thickness of both the first and second conductive sheets and their respective conductive portions while maintaining low resistivity. Consequently, the height difference between the surface of the first conductive sheet furthest from the battery cell and the first surface is reduced, as is the height difference between the surface of the second conductive sheet furthest from the battery cell and the first surface. During the lamination process, this avoids problems such as uneven film filling or fragmentation caused by excessive height differences between the first and / or second conductive sheets and the first surface.

[0028] Supporting films are further provided on both sides of the first conductive portion along the first direction and on both sides of the second conductive portion along the first direction. These supporting films are disposed between the first conductive sheet and the battery cell, and between the second conductive sheet and the battery cell. During lamination, the supporting films provide support for the first and second conductive sheets, ensuring balanced stress on the battery cell where the first and second conductive sheets are located compared to where they are not, thus preventing fragmentation due to uneven local stress. Furthermore, the molten supporting films fill the gaps between the first and second conductive sheets and the battery cell, preventing air bubbles from forming between them. Attached Figure Description

[0029] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this application or in the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A top view of a photovoltaic module provided for implementation of this application;

[0031] Figure 2 A top view of another photovoltaic module provided for implementation of this application;

[0032] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure along the AA1 direction;

[0033] Figure 4 for Figure 2 A schematic diagram of the cross-sectional structure along the BB1 ​​direction;

[0034] Figure 5 for Figure 3 The diagram shows the structure of a photovoltaic module after lamination.

[0035] Figure 6 for Figure 4 The diagram shows the structure of a photovoltaic module after lamination.

[0036] Figure 7 This is a top view of multiple solar cells connected in a photovoltaic module according to an embodiment of the present application;

[0037] Figure 8This is a top view of multiple solar cells connected in another photovoltaic module provided in an embodiment of this application;

[0038] Figure 9 A top view of multiple solar cells connected in another photovoltaic module provided in this application embodiment;

[0039] Figure 10 for Figure 1 The photovoltaic module shown is a top view with the first and second conductive sheets hidden.

[0040] Figure 11 for Figure 2 The photovoltaic module shown is a top view with the first and second conductive sheets hidden.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100. Battery cell; 101. First side; 102. Second side; 111. First conductive part; 112. Second conductive part; 121. First conductive sheet; 122. Second conductive sheet; 130. Supporting film; 131. First grid; 132. Second grid; 141. First extension; 142. Second extension; 151. First main grid; 152. Second main grid; 161. First main body; 162. Second main body; 171. First welding part; 172. Second welding part; 181. First film; 182. Second film; 191. First cover plate; 192. Second cover plate. Detailed Implementation

[0043] As is known from the background technology, there is a problem of low reliability in the process of manufacturing photovoltaic modules with IBC cells.

[0044] In IBC (In-line Contact) photovoltaic modules, multiple back-contact cells undergo stringing, lamination, and encapsulation to form a back-contact photovoltaic module. However, during the stringing process, stress on the solder ribbons can cause warping of the cell string, leading to microcracks and fragmentation, which severely affects the reliability of the back-contact cell string.

[0045] Conventional back-contact photovoltaic (PV) modules primarily connect solar cells via solder ribbons. This design presents several challenges: traditional high-temperature soldering processes can lead to cell warping, and with thicker solder ribbons, cell breakage can occur during lamination, impacting the module's reliability. Furthermore, PV module manufacturing presents difficulties in layout and complex soldering processes, resulting in a cumbersome and costly process.

[0046] Therefore, developing a back-contact photovoltaic module that can improve the power and reliability of photovoltaic modules has become the focus and challenge of current research.

[0047] This application provides a photovoltaic module and its manufacturing method. In the photovoltaic module, the solar cells are back-contact cells. A first conductive sheet is electrically connected to a first fine grid via a first conductive portion, and a second conductive sheet is electrically connected to a second fine grid via a second conductive portion. The first and second conductive sheets are used to collect current from the first and second fine grids, respectively. Both the first and second conductive sheets can have a large width and a thin thickness. While ensuring low resistivity of both the first and second conductive sheets, the total thickness of the first conductive sheet and the first conductive portion, as well as the total thickness of the second conductive sheet and the second conductive portion, is reduced. This reduces the height difference between the surface of the first conductive sheet furthest from the solar cell and the first surface, and also reduces the height difference between the surface of the second conductive sheet furthest from the solar cell and the first surface. During the lamination process, this avoids problems such as uneven film filling or fragmentation caused by excessive height differences between the first and / or second conductive sheets and the first surface. During the lamination process, the supporting film supports the first and second conductive sheets, ensuring that the positions on the battery cell with the first and second conductive sheets are evenly stressed compared to the positions without them, thus preventing the battery cell from breaking due to uneven stress in certain areas.

[0048] In the description of the embodiments of this application, the technical terms "first", "second", etc. are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0049] In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0050] In this document, the term "embodiment" means that a specific 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 throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0051] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the method may also include step (c), indicating that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0052] In the description of the embodiments 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 three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0053] In the description of the embodiments of this application, technical terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0054] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0055] In the accompanying drawings corresponding to the embodiments of this application, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component on another component or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0056] In the description of the embodiments of this application, when a component "includes" another component, it does not exclude other components unless otherwise stated, and other components may be further included. Unless otherwise stated, the terms "include" and "comprise" as used in this application are open-ended or closed-ended. For example, "include" and "comprise" may mean that other components not listed may also be included, or only the listed components may be included.

[0057] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments, the term "component" is also intended to include the plural form unless the context clearly indicates otherwise.

[0058] The embodiments of this application will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this application to facilitate a better understanding of the application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0059] exist Figure 1 and Figure 2 For ease of explanation, the first conductive sheet 121, the second conductive sheet 122, and the supporting adhesive film 130 are all in a semi-transparent state. Figures 1 to 4 The photovoltaic module shown has not yet undergone lamination processing; therefore, there are gaps between the first conductive part 111 and the second conductive part 112 and the supporting adhesive film 130. Figure 5 for Figure 3 The diagram shows the structure of a photovoltaic module after lamination. Figure 6 for Figure 4 The diagram shown is a structural schematic of a photovoltaic module after lamination. After lamination, there are no gaps between the first conductive part 111 and the second conductive part 112 and the supporting adhesive film 130.

[0060] refer to Figures 1 to 6 According to some embodiments of this application, one aspect of this application provides a photovoltaic module, including: a solar cell 100, a first conductive part 111, a second conductive part 112, a first conductive sheet 121, a second conductive sheet 122, and a support film 130.

[0061] The battery cell 100 includes a first surface 101 and a second surface 102 disposed opposite to each other. The first surface 101 has a first grid 131 and a second grid 132 with different polarities. Both the first grid 131 and the second grid 132 extend along a first direction X, and are alternately arranged along a second direction Y. The first surface 101 is the backlight surface, and the second surface 102 is the light-receiving surface. The first grid 131 is either a positive grid or a negative grid, and the second grid 132 is either a positive grid or a negative grid.

[0062] The first conductive part 111 is located on the side of the first fine grid 131 away from the battery cell 100, and the second conductive part 112 is located on the side of the second fine grid 132 away from the battery cell 100.

[0063] Both the first conductive sheet 121 and the second conductive sheet 122 extend along the second direction Y. The first conductive sheet 121 is located on the side of the first conductive portion 111 away from the first fine gate 131, and the second conductive sheet 122 is located on the side of the second conductive portion 112 away from the second fine gate 132. The first conductive sheet 121 is electrically connected to the first fine gate 131 through the first conductive portion 111, and the second conductive sheet 122 is electrically connected to the second fine gate 132 through the second conductive portion 112. Specifically, along the first direction X, the width of the first conductive sheet 121 is greater than the width of the first conductive portion 111, and the width of the second conductive sheet 122 is greater than the width of the second conductive portion 112.

[0064] The support film 130 is located on both sides of the first conductive portion 111 along the first direction X and between the first conductive sheet 121 and the battery sheet 100. The support film 130 is also located on both sides of the second conductive portion 112 along the first direction X and between the second conductive sheet 122 and the battery sheet 100.

[0065] In the photovoltaic module provided in this application embodiment, the first surface 101 of the cell 100 has a first grid 131 and a second grid 132. The first grid 131 and the second grid 132 both extend along the first direction X, and the first grid 131 and the second grid 132 are alternately arranged along the second direction Y, thus forming an interdigitated arrangement. The first grid 131 and the second grid 132 with different polarities are located on the same side surface of the cell 100, so that the second surface 102 is not blocked by grid lines, which is beneficial to improving the short-circuit current and conversion efficiency of the cell 100.

[0066] The first conductive sheet 121 is electrically connected to the first fine grid 131 via the first conductive portion 111, and the second conductive sheet 122 is electrically connected to the second fine grid 132 via the second conductive portion 112. The first conductive sheet 121 and the second conductive sheet 122 are used to collect the current from the first fine grid 131 and the second fine grid 132, respectively. Along the first direction X, the width of the first conductive sheet 121 is greater than the width of the first conductive portion 111, and the width of the second conductive sheet 122 is greater than the width of the second conductive portion 112. Thus, both the first conductive sheet 121 and the second conductive sheet 122 can have a large width and a thin thickness. Conventional solutions typically use solder ribbons on the fine grid of the solar cell to collect current. However, due to the large thickness of the solder ribbons, the height difference between the solder ribbons and the solar cell can be too large. During the covering and lamination process, the adhesive film is prone to uneven filling and air bubbles. Furthermore, the large thickness of the solder ribbons can also increase the risk of uneven stress on the solar cell, leading to fragmentation. The first conductive sheet 121 and the second conductive sheet 122 have a large width and a thin thickness. This allows for a reduction in the total thickness of the first conductive sheet 121 and the first conductive portion 111, as well as the total thickness of the second conductive sheet 122 and the second conductive portion 112, while maintaining low resistivity. This reduces the height difference between the surface of the first conductive sheet 121 furthest from the battery cell 100 and the first surface 101, and also reduces the height difference between the surface of the second conductive sheet 122 furthest from the battery cell 100 and the first surface 101. During the lamination process, this avoids problems such as uneven film filling or fragmentation caused by excessive height differences between the first conductive sheet 121 and / or the second conductive sheet 122 and the first surface 101.

[0067] Supporting films 130 are provided on both sides of the first conductive portion 111 along the first direction X and on both sides of the second conductive portion 112 along the first direction X. The supporting films 130 are disposed between the first conductive sheet 121 and the battery cell 100, and between the second conductive sheet 122 and the battery cell 100. During lamination, the supporting films 130 support the first conductive sheet 121 and the second conductive sheet 122, ensuring balanced stress on the battery cell 100 at the locations where the first conductive sheet 121 and the second conductive sheet 122 are provided, thus preventing fragmentation of the battery cell 100 due to uneven local stress. Furthermore, the molten supporting films 130 fill the gaps between the first conductive sheet 121 and the battery cell 100, and between the second conductive sheet 122 and the battery cell 100, preventing air bubbles from forming between them.

[0068] In the accompanying drawings provided in this application, taking a 90° angle between the first direction X and the second direction Y as an example does not constitute a limitation on the angle between the first direction X and the second direction Y. The first direction X and the second direction Y only need to intersect. The intersection of the first direction X and the second direction Y includes: the first direction X and the second direction Y being perpendicular; or, the angle formed by the first direction X and the second direction Y being an obtuse angle; or, the angle formed by the first direction X and the second direction Y being an acute angle. In some examples, the angle between the first direction X and the second direction Y can be 10° to 90°, for example, 10°, 20°, 45°, 55°, 70°, 82°, or 90°. In some specific examples, the angle between the first direction X and the second direction Y can also be 45° to 90°.

[0069] In some embodiments, the solar cell 100 can be a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell, or a multi-component compound solar cell. Specifically, the multi-component compound solar cell can be a cadmium sulfide solar cell, a gallium arsenide solar cell, a copper indium selenide solar cell, or a perovskite solar cell.

[0070] In some embodiments, the solar cell 100 may be an IBC (Interdigitated Back Contact) cell, an HPBC (Hybrid Passivated Back Contact) cell, a TBC cell that combines TOPCon (Tunnel Oxide Passivated Contact) technology and IBC technology, or an HBC cell that combines HJT (Heterojunction Technology) technology and IBC technology. Of course, it may also be other types of back contact cells.

[0071] In some embodiments, the melting point of the first conductive portion 111 is lower than that of the first conductive sheet 121. This allows the first conductive portion 111 to melt first during the welding process, facilitating faster electrical connection between the first conductive sheet 121 and the first fine grid 131. Using a material with a lower melting point for the first conductive portion 111 helps reduce the welding temperature, preventing thermal damage or warping of the battery cell 100. The first conductive sheet 121 can be made of a material with a higher melting point and lower resistivity to improve current transmission efficiency.

[0072] For example, the material of the first conductive portion 111 may include materials with low melting points such as tin, tin-zinc alloy, tin-bismuth alloy, or tin-indium alloy. The material of the first conductive sheet 121 may include materials with low resistivity such as copper, nickel, gold, or silver. In this way, the first conductive portion 111 can be melted by the temperature during the lamination process, thereby enabling the first conductive sheet 121 to achieve electrical connection with the first fine grid 131 without the need for additional high-temperature welding steps. This avoids thermal damage to the battery cell 100 caused by high-temperature welding and also prevents warping of the battery cell 100 after welding.

[0073] Similarly, the melting point of the second conductive part 112 can be lower than that of the second conductive sheet 122. For example, the material of the second conductive part 112 includes materials with low melting points such as tin, tin-zinc alloy, tin-bismuth alloy, or tin-indium alloy. The material of the second conductive sheet 122 includes materials with low resistivity such as copper, nickel, gold, or silver.

[0074] In some embodiments, the material of the first conductive part 111 is the same as the material of the second conductive part 112, which is beneficial for the first conductive part 111 and the second conductive part 112 to be formed in the same process step, thereby improving the manufacturing efficiency of photovoltaic modules.

[0075] In other embodiments, the material of the first conductive portion 111 may be different from the material of the second conductive portion 112.

[0076] In some embodiments, the material of the first conductive sheet 121 and the material of the second conductive sheet 122 can be the same. In this way, the first conductive sheet 121 and the second conductive sheet 122 on different solar cells 100 can be integrally molded, thereby improving the manufacturing efficiency of photovoltaic modules.

[0077] For example, refer to Figure 7 One battery cell 100 (e.g.) Figure 3 The first conductive sheet 121 on the middle battery cell and the other battery cell 100 adjacent to it on one side along the second direction Y (e.g.) Figure 3 The second conductive plates 122 on the battery cell 100 (located on the left side) are interconnected, and the battery cell 100 (as shown in the image) Figure 1 The second conductive sheet 122 on the middle battery cell and the other battery cell 100 adjacent on the other side along the second direction Y (e.g., the middle battery cell) Figure 1 The first conductive sheet 121 on the battery cell located on the right side is connected to each other, so that the first conductive sheet 121 and the second conductive sheet 122 are used to realize the series connection of multiple battery cells 100.

[0078] When the material of the first conductive sheet 121 is the same as that of the second conductive sheet 122, the first conductive sheet 121 and the second conductive sheet 122 on different solar cells 100 can be manufactured in one piece. This not only facilitates the manufacturing of the conductive sheet, but also makes it easier to arrange the solar cells 100 in the photovoltaic module and improves the manufacturing efficiency of the photovoltaic module.

[0079] In other embodiments, the materials of the first conductive sheet 121 and the second conductive sheet 122 may be different. The first conductive sheet 121 and the second conductive sheet 122 may be connected by welding.

[0080] refer to Figure 8 ,by Figure 8 Taking the middle battery cell 100 as an example, on the middle battery cell 100, the first conductive sheet 121 may include a first extension 141 at its first end along the second direction Y. The first extension 141 extends along the first direction X, and the first extensions 141 of adjacent first conductive sheets 121 are interconnected along the first direction X. The second conductive sheet 122 includes a second extension 142 at its second end along the second direction Y. The second extension 142 extends along the first direction X, and the second extensions 142 of adjacent second conductive sheets 122 are interconnected along the first direction X. Thus, for Figure 4 For the battery cell 100 located in the middle, the currents on different first conductive sheets 121 can be connected in parallel through the first extension 141, and the currents on different second conductive sheets 122 can be connected in parallel through the second extension 142, without the need for additional bus bars to achieve current collection.

[0081] Continue to refer to Figure 8 In some embodiments, a battery cell 100 (e.g. Figure 4 The first extension 141 on the middle battery cell and the other battery cell 100 (such as...) Figure 4 The first extension 141 and the second extension 142 on the left-hand solar cell are interconnected. In this way, the first extension 141 and the second extension 142 can be connected to other solar cells 100 or devices to achieve different functions according to circuit requirements, without the need for additional busbars or jumpers, thus improving the flexibility of photovoltaic module circuit layout.

[0082] For example, refer to Figure 9 In some embodiments, with Figure 9 Taking the middle solar cell 100 as an example, this solar cell 100 (e.g. Figure 5 The first conductive sheet 121 on the middle battery cell and the other battery cell 100 adjacent to it on one side along the second direction Y (e.g.) Figure 5 The second conductive plates 122 on the battery cell 100 (located on the left side) are directly interconnected; and the battery cell 100 (as shown in the image) is directly connected to the second conductive plates 122 on the battery cell 100. Figure 5 The second extension 142 of the second conductive sheet 122 on the middle battery cell, and the other battery cell 100 (such as the one located in the middle of the battery cell) on the other side along the second direction Y, are adjacent to each other. Figure 5 The first extension 141 of the first conductive sheet 121 on the battery cell located on the right side is directly connected.

[0083] The material of the first extension 141 may include materials with low resistivity such as copper, nickel, gold, or silver.

[0084] The material of the second extension 142 may include materials with low resistivity such as copper, nickel, gold, or silver.

[0085] In some embodiments, the material of the first extension 141 is the same as the material of the first conductive sheet 121, so that the first conductive sheet 121 and the first extension 141 can be integrally formed.

[0086] In other embodiments, the material of the first extension 141 may be different from the material of the first conductive sheet 121. The first conductive sheet 121 and the first extension 141 may be connected by welding.

[0087] In some embodiments, the material of the second extension 142 is the same as the material of the second conductive sheet 122, so that the second conductive sheet 122 and the second extension 142 can be integrally formed.

[0088] In other embodiments, the material of the second extension 142 may be different from the material of the second conductive sheet 122. The second conductive sheet 122 and the second extension 142 may be connected by welding.

[0089] In some embodiments, the materials of the first extension 141, the first conductive sheet 121, the second extension 142, and the second conductive sheet 122 are all the same, so that the first extension 141, the first conductive sheet 121, the second extension 142, and the second conductive sheet 122 can be integrally formed.

[0090] In other embodiments, the materials of the first extension 141, the first conductive sheet 121, the second extension 142, and the second conductive sheet 122 may all be different. The first extension 141, the first conductive sheet 121, the second extension 142, and the second conductive sheet 122 may be connected by welding.

[0091] refer to Figure 3 or Figure 4In some embodiments, the width of the first conductive sheet 121 along the first direction X is W1, and the thickness of the first conductive sheet 121 along the direction perpendicular to the first surface 101 is D1, where W1 and D1 satisfy: 15 ≤ W1 / D1 ≤ 300. Thus, the first conductive sheet 121 can be flat, maintaining a large cross-sectional area to ensure high electrical transmission efficiency while reducing the thickness D1 of the first conductive sheet 121. This effectively avoids problems such as uneven film filling or fragmentation during the lamination process caused by excessive thickness of the first conductive sheet 121.

[0092] W1 can be 2mm to 15mm, specifically 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, or 15mm. D1 can be 0.05mm to 0.13mm, specifically 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, or 0.13mm.

[0093] refer to Figure 3 or Figure 4 In some embodiments, the width of the second conductive sheet 122 along the first direction X is W2, and the thickness of the second conductive sheet 122 along the direction perpendicular to the first surface 101 is D2, where W2 and D2 satisfy: 15 ≤ W2 / D2 ≤ 300. Thus, the second conductive sheet 122 can be flat, maintaining a large cross-sectional area to ensure high electrical transmission efficiency while reducing the thickness D2 of the second conductive sheet 122. This effectively avoids problems such as uneven film filling or fragmentation during the lamination process caused by excessive thickness of the second conductive sheet 122.

[0094] W2 can be 2mm to 15mm, specifically 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, or 15mm. D2 can be 0.05mm to 0.13mm, specifically 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, or 0.13mm.

[0095] refer to Figure 10 In some embodiments, the first conductive portion 111 extends along the second direction Y. In this way, the first conductive portion 111 can directly electrically connect the multiple first fine grids 131 arranged along the second direction Y to form a gridless structure, reduce the cost of grid line paste, and at the same time reduce the series resistance and improve the power of photovoltaic modules through a shorter current transmission path.

[0096] Continue to refer to Figure 10 In some embodiments, the second conductive portion 112 extends along the second direction Y. Thus, the second conductive portion 112 can directly electrically connect multiple second fine grids 132 arranged along the second direction Y to form a gridless structure, reducing the cost of grid line paste. Simultaneously, the shorter current transmission path reduces series resistance and increases the power of the photovoltaic module.

[0097] refer to Figure 11 In some embodiments, the photovoltaic module may further include: a first main grid 151 and a second main grid 152 extending along a second direction Y, the first main grid 151 and the second main grid 152 being alternately arranged along a first direction X, each first main grid 151 being electrically connected to a plurality of first fine grids 131 arranged along the second direction Y, and each second main grid 152 being electrically connected to a plurality of second fine grids 132 arranged along the second direction Y. The first main grid 151 includes a first body portion 161 and a first welding portion 171, the width of the first welding portion 171 being greater than the width of the first body portion 161 along the first direction X, and a first conductive portion 111 being located on the side of the first welding portion 171 away from the solar cell. The second main grid 152 includes a second body portion 162 and a second welding portion 172, the width of the second welding portion 172 being greater than the width of the second body portion 162 along the first direction X, and a second conductive portion 112 being located on the side of the second welding portion 172 away from the solar cell 100. Thus, the current on the first fine gate 131 is first collected through the first main gate 151, and then transmitted to the first conductive sheet through the first conductive part 111 on the first welding part 171. The current on the second fine gate 132 is first collected through the second main gate 152, and then transmitted to the second conductive sheet through the second conductive part 112 on the second welding part 172.

[0098] refer to Figure 10 In some embodiments, the support film 130 may be located on both sides of the first conductive portion 111 along the first direction X and on both sides of the second conductive portion 112 along the first direction X. (See reference...) Figure 11 In some embodiments, the support film 130 may be located on both sides of the first conductive portion 111 along the first direction X and on both sides of the second conductive portion 112 along the first direction X, and also on both sides of the first conductive portion 111 along the second direction Y and on both sides of the second conductive portion 112 along the second direction Y.

[0099] refer to Figure 1 or Figure 2In some embodiments, the spacing between adjacent first conductive sheet 121 and second conductive sheet 122 along the first direction X is a first spacing L1, and the spacing between adjacent first fine gate 131 and second fine gate 132 along the second direction Y is a second spacing L2, where the first spacing L1 is smaller than the second spacing L2. Thus, while ensuring no leakage occurs between the first conductive sheet 121 and second conductive sheet 122, the first conductive sheet 121 and second conductive sheet 122 can have a larger width, which is beneficial for relatively increasing the cross-sectional area of ​​the first conductive sheet 121 and second conductive sheet 122 and reducing their resistivity.

[0100] The first spacing L1 can be 0.2mm to 1mm, for example, it can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0101] refer to Figures 3 to 6 In some embodiments, the photovoltaic module further includes a first encapsulant film 181, a second encapsulant film 182, a first cover plate 191, and a second cover plate 192. The first encapsulant film 181 is located on the side of the first conductive sheet 121 and the second conductive sheet 122 away from the solar cell 100, and the first cover plate 191 is located on the side of the first encapsulant film 181 away from the solar cell 100; the second encapsulant film 182 is located on the second surface 102 of the solar cell 100, and the second cover plate 192 is located on the side of the second encapsulant film 182 away from the solar cell 100.

[0102] The materials of the first film 181 include organic encapsulation films such as ethylene-vinyl acetate copolymer (EVA) film, polyvinyl octene coelastomer (POE) film, or polyvinyl butyral (PVB) film.

[0103] The second film 182 is made of organic encapsulating films such as ethylene-vinyl acetate copolymer (EVA) film, polyvinyl octene coelastomer (POE) film, or polyvinyl butyral (PVB) film.

[0104] The first cover plate 191 can be a glass cover plate, a plastic cover plate, or other cover plate with light transmission function.

[0105] The second cover plate 192 can be a glass cover plate, a plastic cover plate, or other cover plate with light transmission function.

[0106] In the photovoltaic module provided in this application embodiment, the first surface 101 of the cell 100 has a first grid 131 and a second grid 132. The first grid 131 and the second grid 132 both extend along the first direction X, and the first grid 131 and the second grid 132 are alternately arranged along the second direction Y, thus forming an interdigitated arrangement. The first grid 131 and the second grid 132 with different polarities are located on the same side surface of the cell 100, so that the second surface 102 is not blocked by grid lines, which is beneficial to improving the short-circuit current and conversion efficiency of the cell 100.

[0107] The first conductive sheet 121 is electrically connected to the first fine grid 131 via the first conductive portion 111, and the second conductive sheet 122 is electrically connected to the second fine grid 132 via the second conductive portion 112. The first conductive sheet 121 and the second conductive sheet 122 are used to collect the current from the first fine grid 131 and the second fine grid 132, respectively. Along the first direction X, the width of the first conductive sheet 121 is greater than the width of the first conductive portion 111, and the width of the second conductive sheet 122 is greater than the width of the second conductive portion 112. Thus, both the first conductive sheet 121 and the second conductive sheet 122 can have a large width and a thin thickness. Conventional solutions typically use solder ribbons on the fine grid of the solar cell to collect current. However, due to the large thickness of the solder ribbons, the height difference between the solder ribbons and the solar cell can be too large. During the covering and lamination process, the adhesive film is prone to uneven filling and air bubbles. Furthermore, the large thickness of the solder ribbons can also increase the risk of uneven stress on the solar cell, leading to fragmentation. The first conductive sheet 121 and the second conductive sheet 122 have a large width and a thin thickness. This allows for a reduction in the total thickness of the first conductive sheet 121 and the first conductive portion 111, as well as the total thickness of the second conductive sheet 122 and the second conductive portion 112, while maintaining low resistivity. This reduces the height difference between the surface of the first conductive sheet 121 furthest from the battery cell 100 and the first surface 101, and also reduces the height difference between the surface of the second conductive sheet 122 furthest from the battery cell 100 and the first surface 101. During the lamination process, this avoids problems such as uneven film filling or fragmentation caused by excessive height differences between the first conductive sheet 121 and / or the second conductive sheet 122 and the first surface 101.

[0108] Supporting films 130 are provided on both sides of the first conductive portion 111 along the first direction X and on both sides of the second conductive portion 112 along the first direction X. The supporting films 130 are disposed between the first conductive sheet 121 and the battery cell 100, and between the second conductive sheet 122 and the battery cell 100. During lamination, the supporting films 130 support the first conductive sheet 121 and the second conductive sheet 122, ensuring balanced stress on the battery cell 100 at the locations where the first conductive sheet 121 and the second conductive sheet 122 are provided, thus preventing fragmentation of the battery cell 100 due to uneven local stress. Furthermore, the molten supporting films 130 fill the gaps between the first conductive sheet 121 and the battery cell 100, and between the second conductive sheet 122 and the battery cell 100, preventing air bubbles from forming between them.

[0109] Accordingly, another embodiment of this application also provides a method for manufacturing a photovoltaic module, which can be used to manufacture the photovoltaic module provided in the above embodiments to improve the reliability of the photovoltaic module. The following will describe in detail the method for manufacturing a photovoltaic module provided in another embodiment of this application with reference to the accompanying drawings. For parts that are the same as or corresponding to the previous embodiment, please refer to the corresponding descriptions of the foregoing embodiments; detailed descriptions will not be repeated below.

[0110] According to some embodiments of this application, another aspect of this application also provides a method for manufacturing a photovoltaic module, including:

[0111] refer to Figure 10 and Figure 3 Or refer to Figure 4 and Figure 11 A battery cell 100 is provided, comprising a first surface 101 and a second surface 102 disposed opposite to each other. The first surface 101 has a first grid 131 and a second grid 132 with different polarities. Both the first grid 131 and the second grid 132 extend along a first direction X and are alternately arranged along a second direction Y. A first conductive portion 111 and a second conductive portion 112 are formed, with the first conductive portion 111 located on the side of the first grid 131 away from the battery cell 100, and the second conductive portion 112 located on the side of the second grid 132 away from the battery cell 100. A support film 130 is laid, located on both sides of the first conductive portion 111 along the first direction X, and also on both sides of the second conductive portion 112 along the first direction X.

[0112] refer to Figure 1 and Figure 3 or Figure 2 and Figure 4A first conductive sheet 121 and a second conductive sheet 122 extending along the second direction Y are laid. The first conductive sheet 121 is located on the side of the first conductive portion 111 away from the first fine grid 131, and the second conductive sheet 122 is located on the side of the second conductive portion 112 away from the second fine grid 132. Along the first direction X, the width of the first conductive sheet 121 is greater than the width of the first conductive portion 111, and the width of the second conductive sheet 122 is greater than the width of the second conductive portion 112. A support film 130 is located between the first conductive sheet 121 and the battery cell 100, and between the second conductive sheet 122 and the battery cell 100.

[0113] refer to Figure 5 or Figure 6 The first conductive sheet 121 is electrically connected to the first fine gate 131 through the first conductive part 111, and the second conductive sheet 122 is electrically connected to the second fine gate 132 through the second conductive part 112.

[0114] In the photovoltaic module manufacturing method provided in this application embodiment, a first fine grid 131 and a second fine grid 132 with different polarities and arranged in an interdigitated pattern are provided on the first surface 101 of the cell 100. Before lamination, a first conductive portion 111 is formed on the first fine grid 131 and a second conductive portion 112 is formed on the second fine grid 132. A support film 130 is laid on both sides of the first conductive portion 111 along the first direction X and on both sides of the second conductive portion 112 along the first direction X. Then, a first conductive sheet 121 and a second conductive sheet 122 are laid on the first conductive portion 111 and the second conductive portion 112, respectively. Finally, the lamination process is used to melt the first conductive portion 111 and the second conductive portion 112, and the first conductive sheet 121 is electrically connected to the first fine grid 131 through the first conductive portion 111, and the second conductive sheet 122 is electrically connected to the second fine grid 132 through the second conductive portion 112. Because the width of the first conductive sheet 121 is greater than the width of the first conductive portion 111, and the width of the second conductive sheet 122 is greater than the width of the second conductive portion 112, both the first conductive sheet 121 and the second conductive sheet 122 can have a large width and a thin thickness. During the lamination process, this avoids the problem of uneven film filling or fragmentation caused by excessive height difference between the first conductive sheet 121 and / or the second conductive sheet 122 and the first surface 101. In addition, due to the supporting effect of the supporting film 130, the positions on the battery cell 100 where the first conductive sheet 121 and the second conductive sheet 122 are provided are subjected to balanced forces with the positions where the first conductive sheet 121 and the second conductive sheet 122 are not provided, thus preventing the battery cell 100 from fragmenting due to uneven local forces. After lamination, the support film 130 melts and fills the gaps between the first conductive sheet 121 and the battery cell 100, as well as the gaps between the second conductive sheet 122 and the battery cell 100, thus avoiding the problem of air bubbles between the first conductive sheet 121 and the battery cell 100, and between the second conductive sheet 122 and the battery cell 100.

[0115] refer to Figure 3 or Figure 4 In some embodiments, before lamination, the thickness H1 of the first conductive portion 111 is greater than the thickness H2 of the supporting adhesive film 130 in the direction perpendicular to the first surface 101. During lamination, the first conductive portion 111 melts, and the first conductive sheet 121 moves towards the first conductive portion 111 under pressure to ensure sufficient welding between the first conductive sheet 121 and the first conductive portion 111. Therefore, after lamination, the thickness of the first conductive portion 111 is slightly reduced. To facilitate sufficient welding between the first conductive portion 111 and the first conductive sheet 121, the height of the first conductive portion 111 before lamination can be higher than the height of the supporting adhesive film 130 to avoid incomplete soldering between the first conductive portion 111 and the first conductive sheet 121.

[0116] Similarly, before lamination, the thickness of the second conductive part 112 can be greater than the thickness of the supporting adhesive film 130.

[0117] refer to Figure 3 or Figure 4 In some embodiments, before lamination, the distance C1 between the support film 130 and the first conductive portion 111 along the first direction X is greater than 0. This avoids the support film 130 melting and directly covering the surface of the first conductive portion 111 during lamination, which would prevent the first conductive portion 111 from forming an electrical connection with the first conductive sheet 121.

[0118] Similarly, before lamination, the distance C2 between the support film 130 and the second conductive part 112 along the first direction X can be greater than 0.

[0119] C1 can be 0.05mm to 0.5mm, for example, it can be 0.05mm, 0.08mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm.

[0120] C2 can be 0.05mm to 0.5mm, for example, it can be 0.05mm, 0.08mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm.

[0121] In some embodiments, C1 may be equal to C2. In other embodiments, C1 may not be equal to C2.

[0122] refer to Figure 11 When the support film 130 is located on both sides of the first conductive portion 111 along the first direction X and on both sides of the second conductive portion 112 along the first direction X, and also on both sides of the first conductive portion 111 along the second direction Y and on both sides of the second conductive portion 112 along the second direction Y, before lamination, the distance between the support film 130 and the first conductive portion 111 along the second direction Y may be greater than 0, and / or the distance between the support film 130 and the second conductive portion 112 may also be greater than 0.

[0123] Before lamination, the distance between the support film 130 and the first conductive part 111 along the second direction Y can be 0.05mm to 0.5mm, for example, it can be 0.05mm, 0.08mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm.

[0124] Before lamination, the distance between the support film 130 and the second conductive part 112 along the second direction Y can be 0.05mm to 0.5mm, for example, it can be 0.05mm, 0.08mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm.

[0125] In some embodiments, reference Figures 3 to 6 Before providing the battery cell 100, the process includes: laying a second adhesive film 182 on a second cover plate 192; and laying the battery cell 100 with its second side 102 facing the second adhesive film 182 on the second adhesive film 182. Then, laying a first conductive portion 111, a second conductive portion 112, a supporting adhesive film 130, a first conductive sheet 121, and a second conductive sheet 122 on the battery cell 100. After laying the first conductive sheet 121 and the second conductive sheet 122, the process includes: laying the first adhesive film 181 on the side of the first conductive sheet 121 and the second conductive sheet 122 away from the battery cell 100, and laying the first cover plate 191 on the side of the first adhesive film 181 away from the battery cell 100, and finally performing a lamination process.

[0126] Prior to lamination, the pre-crosslinking degree of the support film 130 can be greater than that of the first film 181. Thus, during lamination, the fluidity of the support film 130 is less than that of the first film 181. This avoids the support film 130's excessive fluidity preventing the first conductive portion 111 from being covered and thus failing to electrically connect with the first conductive sheet 121, or the second conductive portion 112 from being covered and thus failing to electrically connect with the second conductive sheet 122.

[0127] In some embodiments, the pre-crosslinking degree of the support film 130 before lamination can be 5% to 30%, for example, it can be 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 24%, 26%, 28% or 30%.

[0128] In some embodiments, the pre-crosslinking degree of the first adhesive film 181 before lamination can be 0% to 20%, for example, it can be 0%, 2%, 5%, 8%, 10%, 13%, 15%, 17% or 20%.

[0129] Those skilled in the art will understand that the above embodiments are specific examples of implementing this application, and in practical applications, various changes in form and detail can be made without departing from the spirit and scope of this application. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this application; therefore, the scope of protection of this application should be determined by the scope defined in the claims.

Claims

1. A photovoltaic module, characterized in that, include: A battery cell includes a first surface and a second surface disposed opposite to each other. The first surface has a first grid and a second grid with different polarities. The first grid and the second grid both extend along a first direction and are alternately arranged along a second direction. A first conductive portion and a second conductive portion, wherein the first conductive portion is located on the side of the first fine grid away from the battery cell, and the second conductive portion is located on the side of the second fine grid away from the battery cell; A first conductive sheet and a second conductive sheet extending along the second direction, wherein the first conductive sheet is located on the side of the first conductive portion away from the first fine grid, and the second conductive sheet is located on the side of the second conductive portion away from the second fine grid. The first conductive sheet is electrically connected to the first fine grid through the first conductive portion, and the second conductive sheet is electrically connected to the second fine grid through the second conductive portion. In the first direction, the width of the first conductive sheet is greater than the width of the first conductive portion, and the width of the second conductive sheet is greater than the width of the second conductive portion. A supporting adhesive film is located on both sides of the first conductive portion along the first direction and between the first conductive sheet and the battery sheet. The supporting adhesive film is also located on both sides of the second conductive portion along the first direction and between the second conductive sheet and the battery sheet.

2. The photovoltaic module according to claim 1, characterized in that, The melting point of the first conductive part is lower than the melting point of the first conductive sheet; and / or, the melting point of the second conductive part is lower than the melting point of the second conductive sheet.

3. The photovoltaic module according to claim 1 or 2, characterized in that, The material of the first conductive part includes tin, tin-zinc alloy, tin-bismuth alloy, or tin-indium alloy; the material of the second conductive part includes tin, tin-zinc alloy, tin-bismuth alloy, or tin-indium alloy.

4. The photovoltaic module according to claim 3, characterized in that, The first conductive sheet is made of copper, nickel, gold, or silver; the second conductive sheet is made of copper, nickel, gold, or silver.

5. The photovoltaic module according to claim 1, characterized in that, The width of the first conductive sheet along the first direction is W1, and the thickness of the first conductive sheet along the direction perpendicular to the first surface is D1. W1 and D1 satisfy: 15≤W1 / D1≤300; the width of the second conductive sheet along the first direction is W2, and the thickness of the second conductive sheet along the direction perpendicular to the first surface is D2. W2 and D2 satisfy: 15≤W2 / D2≤300.

6. The photovoltaic module according to claim 5, characterized in that, W1 is 2mm~15mm; W2 is 2mm~15mm; D1 is 0.05mm~0.13mm; D2 is 0.05mm~0.13mm.

7. The photovoltaic module according to claim 1, characterized in that, The first conductive portion extends along the second direction, and / or the second conductive portion extends along the second direction.

8. The photovoltaic module according to claim 1, characterized in that, Also includes: A first main gate and a second main gate extending along the second direction, the first main gate and the second main gate being alternately arranged along the first direction, each of the first main gates being electrically connected to a plurality of first fine gates arranged along the second direction, and each of the second main gates being electrically connected to a plurality of second fine gates arranged along the second direction. The first main grid includes a first main body and a first welding part. Along the first direction, the width of the first welding part is greater than the width of the first main body. The first conductive part is located on the side of the first welding part away from the battery cell. The second main grid includes a second main body portion and a second welding portion. Along the first direction, the width of the second welding portion is greater than the width of the second main body portion, and the second conductive portion is located on the side of the second welding portion away from the battery cell.

9. The photovoltaic module according to claim 1, characterized in that, The spacing between adjacent first conductive sheets and second conductive sheets along the first direction is the first spacing, and the spacing between adjacent first fine gates and second fine gates along the second direction is the second spacing, wherein the first spacing is smaller than the second spacing.

10. The photovoltaic module according to claim 9, characterized in that, The first spacing is 0.2mm to 1mm.

11. The photovoltaic module according to claim 1, characterized in that, The first conductive sheet includes a first extension at a first end along the second direction, the first extension extending along the first direction, and the first extensions of adjacent first conductive sheets are connected to each other along the first direction; the second conductive sheet includes a second extension at a second end along the second direction, the second extension extending along the first direction, and the second extensions of adjacent second conductive sheets are connected to each other along the first direction.

12. The photovoltaic module according to claim 11, characterized in that, The first extension on one of the battery cells is connected to the second extension on the other battery cell.

13. The photovoltaic module according to claim 1, characterized in that, The first conductive sheet on one of the battery cells is interconnected with the second conductive sheet on another battery cell adjacent to it on one side along the second direction, and the second conductive sheet on that battery cell is interconnected with the first conductive sheet on another battery cell adjacent to it on the other side along the second direction.

14. A method for manufacturing a photovoltaic module, characterized in that, include: A battery cell is provided, the battery cell including a first side and a second side disposed opposite to each other, the first side having a first grid and a second grid with different polarities, the first grid and the second grid both extending along a first direction and alternately arranged along a second direction; A first conductive portion and a second conductive portion are formed, wherein the first conductive portion is located on the side of the first fine grid away from the solar cell, and the second conductive portion is located on the side of the second fine grid away from the solar cell; A supporting adhesive film is laid, the supporting adhesive film being located on both sides of the first conductive part along the first direction, and also on both sides of the second conductive part along the first direction; A first conductive sheet and a second conductive sheet extending along the second direction are laid. The first conductive sheet is located on the side of the first conductive portion away from the first fine grid, and the second conductive sheet is located on the side of the second conductive portion away from the second fine grid. Along the first direction, the width of the first conductive sheet is greater than the width of the first conductive portion, and the width of the second conductive sheet is greater than the width of the second conductive portion. The supporting adhesive film is located between the first conductive sheet and the battery cell and between the second conductive sheet and the battery cell. A lamination process is performed to electrically connect the first conductive sheet to the first fine gate through the first conductive portion, and to electrically connect the second conductive sheet to the second fine gate through the second conductive portion.

15. The method for manufacturing a photovoltaic module according to claim 14, characterized in that, Before the lamination process is performed, the thickness of the first conductive portion is greater than the thickness of the supporting adhesive film in the direction perpendicular to the first surface, and / or the thickness of the second conductive portion is greater than the thickness of the supporting adhesive film.

16. The method for manufacturing a photovoltaic module according to claim 14, characterized in that, Before the lamination process is performed, the distance C1 between the support film and the first conductive part is greater than 0 along the first direction, and / or the distance C2 between the support film and the second conductive part is greater than 0.

17. The method for manufacturing a photovoltaic module according to claim 16, characterized in that, C1 is 0.05mm~0.5mm; C2 is 0.05mm~0.5mm.

18. The method for manufacturing a photovoltaic module according to claim 14, characterized in that, After laying the first conductive sheet and the second conductive sheet, the method further includes: laying a first adhesive film on the side of the first conductive sheet and the second conductive sheet away from the battery cell; wherein, before lamination, the pre-crosslinking degree of the supporting adhesive film is greater than the pre-crosslinking degree of the first adhesive film.

19. The method for manufacturing a photovoltaic module according to claim 18, characterized in that, Before lamination, the pre-crosslinking degree of the support film is 5%~30%; the pre-crosslinking degree of the first film is 0%~20%.

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