Photovoltaic module, film covering equipment and film covering method thereof

Abstract

The invention relates to the field of photovoltaic technology, and provides a photovoltaic module, a film coating device and a film coating method thereof, and the photovoltaic module comprises at least one group of adjacent first battery piece and second battery piece; the first welding strip extends along a set direction, is positioned on the surfaces of the first battery piece and the second battery piece and on a gap between the first battery piece and the second battery piece, and is used for connecting the first battery piece and the second battery piece; the first thin film covers the surface of the first battery piece and part of the first welding strip, and the edge of the first thin film at least exceeds the edge of the first battery piece on one side close to the second battery piece; the second thin film covers the surface of the second battery piece and part of the first welding strip, and the edge of the second thin film at least exceeds the edge of the second battery piece on the side close to the first battery piece. According to the photovoltaic module, the edge of each film exceeds the edge of the battery piece, so that the gaps between the battery pieces are covered by the films, the solder strip is prevented from displacement or deformation, and the reliability of the photovoltaic module is improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic component, a coating device and a coating method thereof. Background Art

[0002] Photovoltaic modules are devices that connect photovoltaic cells through welding ribbons and package them into photovoltaic arrays to achieve the output of photovoltaic system electricity. Specifically, the preparation process of photovoltaic modules can usually include the following steps: first, the welding ribbon is connected to the main grid on the cell to connect multiple cells to form a cell module, and then a film, a cover plate, etc. are stacked on the cell module to form a laminate, and then the laminate is placed under high temperature and high pressure conditions for a lamination process to form a photovoltaic module.

[0003] Currently, the most common way to connect the soldering ribbon to the main grid line on the solar cell is welding, but the welding method is prone to cold welding or broken grid, which causes the current transmission path between the solar cells to be blocked or even disconnected, thereby affecting the conductive performance of the photovoltaic module and causing insufficient reliability of the photovoltaic module. Summary of the invention

[0004] The main purpose of the present application is to provide a photovoltaic module, a coating device and a coating method thereof, so as to solve the problem of insufficient reliability of photovoltaic modules existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a photovoltaic module is provided, which includes: a plurality of battery cells, the plurality of battery cells are arranged at intervals along a set direction, and the set direction is perpendicular to the thickness direction of the battery cells; the plurality of battery cells include at least one group of adjacent first battery cells and second battery cells; a first welding strip, the first welding strip extends along the set direction, the first welding strip is located on the surface of the first battery cell and the second battery cell and on the interval between the first battery cell and the second battery cell, and the first welding strip is used to connect the first battery cell and the second battery cell; a first film, covering the surface of the first battery cell and a portion of the first welding strip, and the edge of the first film at least exceeds the edge of the first battery cell on the side close to the second battery cell; a second film, covering the surface of the second battery cell and a portion of the first welding strip, and the edge of the second film at least exceeds the edge of the second battery cell on the side close to the first battery cell.

[0006] Optionally, the adjacent edges of the first film and the second film are connected, or partial regions of the first film and the second film overlap with each other to form an overlapping portion.

[0007] Optionally, the photovoltaic module also includes a second welding strip, which extends along the set direction, and the interval between two adjacent second welding strips exposes the interval between the first battery cell and the second battery cell; the overlapping portion covers the end of the second welding strip located on the surface of the first battery cell, and / or the overlapping portion covers the end of the second welding strip located on the surface of the second battery cell.

[0008] Optionally, part of the overlapping portion is located in the interval between the first battery cell and the second battery cell.

[0009] Optionally, the width of the overlapping portion in the set direction is 0.5 mm to 3 mm.

[0010] Optionally, a distance between an edge of the first film close to the second battery cell and an edge of the first battery cell close to the second battery cell in the set direction is less than or equal to 5 mm.

[0011] Optionally, a distance between an edge of the second film close to the first battery cell and an edge of the second battery cell close to the first battery cell in the set direction is less than or equal to 5 mm.

[0012] According to the second aspect of the present application, a coating device is provided, which is used to prepare any one of the photovoltaic modules in the first aspect, and the coating device includes: a supporting platform for placing the multiple battery cells; multiple coating assemblies, the multiple coating assemblies are arranged along a set direction, each of the coating assemblies includes a coating body and two coating branches, and the two coating branches are respectively located on opposite sides of the coating body; multiple driving devices, each of the driving devices is connected to one of the coating branches, and the driving devices are used to drive the coating branches to move closer to or away from the coating body; a clamping device, located between adjacent coating assemblies, for laying welding strips, and the movement direction of the clamping device is different from the movement direction of the coating branches.

[0013] According to the third aspect of the present application, a method for coating a photovoltaic module is provided, and the method for coating a photovoltaic module is implemented using the coating equipment described in the second aspect, and the method for coating a photovoltaic module includes: arranging the multiple battery cells on the support platform at intervals along the set direction; controlling the movement of the clamping device to lay welding strips on the multiple battery cells; controlling the coating assembly to take a film; controlling the coating body to place the film to cover the battery cells and the welding strips on the surface of the battery cells; controlling the coating branch to place the film to cover the film on the intervals between the battery cells.

[0014] Optionally, controlling the film-coating branch to place the film includes: controlling the film-coating branch on one side of the film-coating body to move away from the film-coating body and place the film; controlling the film-coating branch on the other side of the film-coating body to move away from the film-coating body and place the film.

[0015] The beneficial effects of this application are as follows:

[0016] The photovoltaic module includes: a plurality of cells, the plurality of cells are arranged at intervals along a set direction, and the set direction is perpendicular to the thickness direction of the cells; the plurality of cells include at least one group of adjacent first cells and second cells; a first welding strip, the first welding strip extends along the set direction, the first welding strip is located on the surface of the first cell and the second cell and on the interval between the first cell and the second cell, and the first welding strip is used to connect the first cell and the second cell; a first film, covering the surface of the first cell and part of the first welding strip, and the edge of the first film at least exceeds the edge of the first cell on the side close to the second cell; a second film, covering the surface of the second cell and part of the first welding strip, and the edge of the second film at least exceeds the edge of the second cell on the side close to the first cell. In the present application, through the design of the first film and the second film, it is ensured that each film can at least completely cover the welding strip located on the surface of its corresponding cell, and at least cover part of the welding strip located on the interval between adjacent cells, and the film can be used to fix the welding strip on the surface of the cell to prevent the welding strip from displacement or deformation, which is conducive to improving the reliability of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 A schematic diagram of the structure of a photovoltaic module provided according to an embodiment of the present application;

[0019] Figure 2 A schematic diagram of a partial structure of a photovoltaic module provided according to an embodiment of the present application;

[0020] Figure 3 A schematic diagram of a partial structure of another photovoltaic module provided according to an embodiment of the present application;

[0021] Figure 4 A schematic diagram of a partial structure of another photovoltaic module provided according to an embodiment of the present application;

[0022] Figure 5 A schematic diagram of a partial structure of another photovoltaic module provided according to an embodiment of the present application;

[0023] Figure 6 According to the embodiment of the present application, Figure 4 Schematic diagram of the cross-sectional structure along the AA' direction;

[0024] Figure 7 According to the embodiment of the present application, Figure 5 Schematic diagram of the cross-sectional structure in the BB' direction;

[0025] Figure 8 A schematic structural diagram of a film coating device provided according to an embodiment of the present application;

[0026] Fig. 9 A schematic diagram of a coating branch in a first state according to an embodiment of the present application;

[0027] Fig.10 A schematic diagram of a coating branch in a second state according to an embodiment of the present application;

[0028] Fig.11 A flowchart of a photovoltaic module coating method provided according to an embodiment of the present application;

[0029] Fig.12 It is a schematic structural diagram of two adjacent laminating components in the laminating device provided according to an embodiment of the present application.

[0030] The above drawings include the following reference numerals:

[0031] 10. Battery cell; 20. Welding strip; D1. First direction; 11. First battery cell; 12. Second battery cell; 21. First welding strip; 22. Second welding strip; 30. Film; 31. First film; 32. Second film; 40. Overlapping portion; 51. Carrying platform; 52. Coating assembly; F1. First coating assembly; F2. Second coating assembly; 521. Coating body; F11. First coating body; F21. Second coating body; 522. Coating branch; F12. First coating branch; F22. Second coating branch; 53. Driving device; 54. Clamping device; D2. Second direction; D3. Third direction. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be intermediate elements. Moreover, in the specification and claims, when it is described that an element is "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.

[0036] As introduced in the background technology, the problem of insufficient reliability of photovoltaic modules in the coating method in the prior art exists. To solve the above problem, the embodiments of the present application provide a photovoltaic module, and a coating device and a coating method that can be used to prepare the photovoltaic module.

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] Figure 1 Schematic diagram of the structure of a photovoltaic module provided according to an embodiment of the present application. Figure 1 As shown, the photovoltaic module includes a plurality of cells 10, and the plurality of cells 10 can be arranged at intervals along a first direction D1, and each two adjacent cells 10 can be connected by a welding strip 20 to form a component connected in series, thereby forming a circuit capable of generating sufficient voltage and current.

[0039] In practical applications, the cell 10 is a cell without a main grid, and may be one of a Tunnel Oxide Passivated Contact (TOPCon) cell or a Back Contact (BC) cell. Multiple cells 10 in a photovoltaic module may also be arranged along one or more set directions, which are perpendicular to the thickness direction of the cell 10. Adjacent cells 10 may be connected by welding strips 20 to form circuits including but not limited to series connection, parallel connection, or a mixture of series and parallel connection. It is understandable that the type, arrangement, and connection of the cell 10 in the photovoltaic module may be selected according to actual needs, and the embodiments of the present application are not limited thereto.

[0040] Figure 2 A schematic diagram of the partial structure of a photovoltaic module provided according to an embodiment of the present application.

[0041] like Figure 2 As shown, a group of adjacent cells 10 includes a first cell 11 and a second cell 12. The plurality of cells in the photovoltaic module include at least one group as shown in FIG. Figure 2 The first battery cell 11 and the second battery cell 12 shown in the figure may be optionally as follows: Figure 1 Among any two adjacent solar cells 10 in the photovoltaic module shown, one is used as a first solar cell 11 and the other is used as a second solar cell 12 .

[0042] The first battery cell 11 and the second battery cell 12 are connected by a first welding ribbon 21 . The first welding ribbon 21 extends along a set direction (eg, a first direction D1 ) and is located on surfaces of the first battery cell 11 and the second battery cell 12 and on a gap between the first battery cell 11 and the second battery cell 12 .

[0043] The battery cell and the welding strip 20 are covered with a film to protect them. The film can be an ethylene vinyl acetate copolymer (EVA) film, a polyolefin elastomer (Polyolefin Elastomer) film, a polyvinyl butyral (PVB) film, a thermoplastic polyurethane (TPU) film, a silicone film or other polymer film, which is not limited here. Among them, the first film 31 covers the surface of the first battery cell 11 and part of the first welding strip 21, and the edge of the first film 31 exceeds the edge of the first battery cell 11 at least on the side close to the second battery cell 12, and the second film 32 covers the surface of the second battery cell 12 and part of the first welding strip 21, and the edge of the second film 32 exceeds the edge of the second battery cell 12 at least on the side close to the first battery cell 11.

[0044] In the embodiment of the present application, the first film 31 and the second film 32 are designed so that the edge of each film exceeds the edge of the cell it covers. This exceeding design ensures that each film can at least completely cover the welding strip on the surface of the corresponding cell, and at least partially cover the welding strip located in the interval between adjacent cells. After covering the film, the film can be heated to increase the viscosity of the film, so that the welding strip can be fixed to the surface of the cell by the film to prevent the welding strip from displacement or deformation, which is beneficial to improve the reliability of the photovoltaic module. In addition, the film can also protect the cell and welding strip it covers, and can effectively prevent erosion by environmental factors such as moisture and oxygen, thereby further improving the reliability of the photovoltaic module and extending its service life.

[0045] It is worth mentioning that the melting point of the film is lower than that of the soldering tape. Therefore, the temperature required to melt the film is lower. Heating will only melt the film without affecting the shape or position of the soldering tape. Therefore, during the process of heating the film to bond the soldering tape, the soldering tape can remain fixed in the pre-placed position.

[0046] In addition, the design of coating each cell separately allows local adjustments to the component during the production process, such as replacing specific cells or solder strips, without repackaging the entire component, reducing material waste and process complexity, lowering production and maintenance costs, while improving production and maintenance efficiency.

[0047] Specifically, the above-mentioned repairs may be performed during the production process of photovoltaic modules. By testing the battery module formed by connecting multiple battery cells through welding ribbons, if a battery cell or welding ribbon is found to be defective, the film covering the defective battery cell or welding ribbon can be removed. When the film is removed, all the welding ribbons on the surface of the battery cell will be removed. At this time, it is necessary to lay the welding ribbon on the surface of the battery cell again and then coat the film. After all the battery cells are coated and tested to obtain the result that the electrical connection of the product is normal, the process of heating the film is carried out to avoid the film from being bonded to the surface of the battery cell when there is a defect in the battery cell or welding ribbon, thereby reducing unnecessary processes and reducing the difficulty of repair.

[0048] After the film is heated, the welding tape can be bonded to the surface of the battery cell so that the welding tape overlaps the grid line on the surface of the battery cell. In the high temperature and high pressure environment of the subsequent lamination process, the welding tape will melt, thereby welding the grid line overlapped with it. The embodiment of the present application fixes the welding tape position by first covering the film, and then uses the high temperature environment in the lamination process to achieve welding of the welding tape and the battery cell. There is no need to weld the welding tape to the battery cell first, but the welding process is compatible with the lamination process and completed at one time, which is conducive to reducing the process difficulty and improving production efficiency.

[0049] Figure 3It is a schematic diagram of the partial structure of another photovoltaic assembly provided according to an embodiment of the present application.

[0050] like Figure 3 As shown, the adjacent edges of the first film 31 and the second film 32 can be connected, that is, the spacing between the adjacent edges of the first film 31 and the second film 32 is 0, then the first film 31 and the second film 32 can completely cover the first welding strip 21 located at the interval between the first battery cell 11 and the second battery cell 12, and the welding strip located at the gap between adjacent battery cells is also fully covered, and the welding strip is further pressed to the battery cell, so that the welding strip and the battery cell are tightly combined to avoid subsequent poor welding between the two. In addition, more comprehensive protection can be achieved at the interval between adjacent battery cells to prevent environmental factors such as water vapor and oxygen from eroding the battery cell, which is beneficial to improving the overall reliability and service life of the module. The directly connected film edges can also more evenly distribute the stress generated by temperature changes inside the module, reduce the internal damage of the module caused by stress concentration, and further improve the reliability of the photovoltaic module. In addition, the edges of adjacent films are connected, which makes it easier to operate when repairing a single battery cell without affecting the surrounding film structure, reducing the difficulty of repair and potential damage to other components in the module, and improving the efficiency and success rate of module repair. By precisely controlling the connection of the film edges, the amount of film material used can be reduced, the packaging cost can be reduced, and the packaging effect can be ensured not to be affected. At the same time, obvious splicing marks can be avoided, and the appearance quality of photovoltaic modules can be improved.

[0051] Figure 4 It is a schematic diagram of the partial structure of another photovoltaic assembly provided according to an embodiment of the present application.

[0052] like Figure 4 As shown, partial areas of the first film 31 and the second film 32 can overlap with each other to form an overlapping portion 40. The overlapping portion 40 can increase the contact area and bonding strength between the first film 31 and the second film 32, thereby effectively blocking the intrusion of environmental factors such as moisture and oxygen, improving the sealing performance of the component, and reducing the risk of corrosion and failure inside the component. In addition, the overlapping portion 40 is formed by the overlapping of two layers of film, which is thicker than a single layer of film and can provide better protection and enhance the ability of the component to resist impact and wear. The overlapping portion 40 covers the portion of the first welding strip 21 located at the interval between the battery cells, which can prevent the first welding strip 21 in this portion from shifting or warping. Therefore, the existence of the overlapping portion 40 is beneficial to improving the reliability of the photovoltaic module.

[0053] Figure 5 It is a schematic diagram of the partial structure of another photovoltaic assembly provided according to an embodiment of the present application.

[0054] like Figure 5As shown, the photovoltaic module also includes a second welding strip 22, which extends along a set direction (first direction D1), and the interval between two adjacent second welding strips 22 exposes the interval between the first battery cell 11 and the second battery cell 12. The overlapping portion 40 can cover the end of the second welding strip 22 located on the surface of the first battery cell 11, or the overlapping portion 40 can cover the end of the second welding strip 22 located on the surface of the second battery cell 12, or the overlapping portion 40 can simultaneously cover the end of the second welding strip 22 located on the surface of the first battery cell 11 and the end of the second welding strip 22 located on the surface of the second battery cell 12.

[0055] The overlapping portion 40 covers the end of the second welding strip 22, and the film covering the end of the second welding strip 22 can have a greater thickness to press the end of the second welding strip 22 to the battery cell, thereby improving the connection strength between the end of the second welding strip 22 and the battery cell, ensuring the long-term stability of the electrical connection between the two, reducing the risk of short circuit or poor contact, and improving the reliability of the component.

[0056] Figure 6 According to the embodiment of the present application, Figure 4 Schematic diagram of the cross-sectional structure along the AA' direction; Figure 7 According to the embodiment of the present application, Figure 5 Schematic diagram of the cross-sectional structure along the BB' direction.

[0057] like Figure 6 and Figure 7 As shown, the partial overlapping portion 40 can be located in the gap between the first cell 11 and the second cell 12. Specifically, the overlapping portion 40 can be melted into the gap between adjacent cells at high temperature during the subsequent preparation process of the photovoltaic module, for example, during the lamination process. At the same time, the first welding ribbon 21 can be pressed into the gap between the first cell 11 and the second cell 12. The portion of the first welding ribbon 21 located on the surface of the first cell 11 and the second cell 12 can fit more closely with the surface of the cell, and the overlapping portion 40 can extend to the side of the cell, thereby effectively sealing the cell and the welding ribbon to form a continuous protective layer, significantly increasing the protection range, forming a more closed environment, providing all-round protection for the cell, and helping to further improve the reliability of the photovoltaic module.

[0058] The width of the overlapping portion 40 is designed based on the spacing of the cells in a conventional photovoltaic module. For example, the spacing between two adjacent cells in a photovoltaic module can generally be 0.6 mm to 0.8 mm. In some embodiments of the present application, the width of the overlapping portion 40 in the set direction (first direction D1) is 1.8 mm to 2 mm. Setting the width of the overlapping portion 40 within the above range can meet the requirements for the adhesion of the film, and any value in the range of values ​​of the width of the overlapping portion 40 is greater than any value in the range of values ​​of the spacing between adjacent cells. Setting the width of the overlapping portion 40 within the above range can ensure that the spacing between the cells can be fully covered by the overlapping portion 40, thereby improving the reliability of the package.

[0059] Optionally, the width of the overlapping portion 40 in a set direction (first direction D1) can be 0.5mm~3mm. This is because the spacing between adjacent solar cells may be different in different products. By selecting the value of the overlapping portion 40 within the above range, it can prevent the film from excessively exceeding the edge of the cell it covers and extending to the adjacent cell (for example, the first film 31 extends excessively to the second cell 12, or the second film 32 extends excessively to the first cell 11) while ensuring that the overlapping portion 40 covers the spacing between the cells. This can avoid the phenomenon of excessive local film thickness and improve the consistency of the surface of the photovoltaic module.

[0060] It is understandable that the spacing between adjacent battery cells, the width of the film beyond the edge of the battery cell it covers, and the width of the overlapping portion formed by the overlapping of the exceeding film can all be designed according to product requirements, and the embodiments of the present application are not limited thereto.

[0061] In some embodiments of the present application, the distance between the edge of the first film 31 on the side close to the second battery cell 12 and the edge of the first battery cell 11 on the side close to the second battery cell 12 in a set direction (first direction D1) is less than or equal to 5 mm, that is, the width of the first film 31 exceeding the first battery cell 11 is less than or equal to 5 mm. By setting the width of the first film 31 exceeding the first battery cell 11 within the above range, the amount of the first film 31 is controlled while ensuring that the first film 31 can completely cover the gap between the first battery cell 11 and the second battery cell 12, and that at least a portion of the first film 31 can enter the gap between the first battery cell 11 and the second battery cell 12 in a subsequent process, thereby avoiding material waste and controlling production costs.

[0062] Similarly, in some embodiments of the present application, the distance between the edge of the second film 32 on the side close to the first battery cell 11 and the edge of the second battery cell 12 on the side close to the first battery cell 11 in the set direction (first direction D1) is less than or equal to 5 mm. That is, the width of the second film 32 beyond the second battery cell 12 is less than or equal to 5 mm. By setting the width of the second film 32 beyond the second battery cell 12 within the above range, it can be ensured that the second film 32 can completely cover the gap between the first battery cell 11 and the second battery cell 12, and that at least part of the second film 32 can enter the gap between the first battery cell 11 and the second battery cell 12 in the subsequent process, thereby controlling the amount of the second film 32, thereby avoiding material waste and controlling production costs.

[0063] Based on the same concept, a coating device is also provided according to an embodiment of the present application, and the coating device can be used to prepare the above-mentioned photovoltaic module. Figure 8 Schematic diagram of the structure of a coating device provided according to an embodiment of the present application. Figure 8 As shown, the laminating device may include a carrier 51, a laminating assembly 52, a driving device 53 and a clamping device 54. The specific configuration of the laminating device is as follows:

[0064] The carrier 51 is used to place multiple battery cells. It can be designed in a flat surface to facilitate the flattening and positioning of the battery cells. Its surface can be smooth to reduce friction and avoid damaging the battery cells. The surface of the carrier 51 can have a limiting structure to facilitate arranging multiple battery cells in a set direction (such as the first direction D1) and control the distance between each two adjacent battery cells to a set value, thereby achieving process standardization.

[0065] The plurality of film coating components 52 are arranged along a set direction, which may be the same as the arrangement direction of the plurality of battery cells, for example, the first direction D1, so as to align the battery cells for the film coating process. Figure 8 As shown, in order to achieve slice coating, the coating assembly 52 can be set one by one corresponding to the battery cells. In order to improve the accuracy of the film covering position, the coating assembly 52 can be set directly above the corresponding battery cell. When performing the coating process, the coating assembly 52 can be controlled to move along the second direction D2 to approach the battery cell so that the film contacts the corresponding battery cell.

[0066] Each film covering component 52 includes a film covering body 521 and two film covering branches 522, and the two film covering branches 522 are respectively located on opposite sides of the film covering body 521. It can be understood that the opposite sides of the film covering body 521 are the two sides of the film covering component 52 in the above-mentioned set direction (for example, the first direction D1). The film covering component 52 can be taken by adsorption. Specifically, the film covering body 521 is used to adsorb the part of the film to be covered on the surface of the battery cell, and the film covering branch 522 is used to adsorb the part of the film to be set in the area beyond the battery cell, including the part of the film to be covered at the battery cell interval and the part to be covered on the surface of the adjacent battery cell.

[0067] The driving device 53 can be a relatively small cylinder or motor, etc., so as to be arranged in the interval between adjacent film-coating bodies 521 and avoid affecting other parts of the film-coating device. Among the multiple driving devices 53 of the film-coating device, each driving device 53 is connected to a film-coating branch 522, and the driving device 53 is used to drive the film-coating branch 522 to approach or move away from the film-coating body 521, so that the film-coating branch 522 is in the first state or the second state, wherein, Fig. 9 FIG. 5 is a schematic diagram of a coating branch 522 in a first state according to an embodiment of the present application. The first state is a state in which the coating branch 522 is away from the coating body 521. Fig.10 This is a schematic diagram of a coating branch 522 in a second state according to an embodiment of the present application. The second state is a state where the coating branch 522 is close to the coating body 521 .

[0068] Specifically, the movement of the coating branch 522 may include but is not limited to the following situations: before removing the film, the driving device 53 controls the coating branch 522 to move away from the coating body 521 so that the coating branch 522 is in the first state, so that the film 30 can be adsorbed on the surface of the coating branch 522 with adsorption function when removing the film; before covering the film 30 on the surface of the battery cell through the coating body 521, the driving device 53 controls the coating branch 522 to move close to the coating body 521 so that the coating branch 522 is in the second state, so as to avoid interfering with the coating body 521 covering the film 30 on the surface of the battery cell; when the film 30 is set in an area beyond the corresponding battery cell through the coating branch 522, the driving device 53 controls the coating branch 522 to move away from the coating body 521 so that the coating branch 522 is in the first state, and then puts down the film 30 adsorbed on the coating branch 522.

[0069] The clamping device 54 is located between adjacent film components 52 and can be used to lay the welding ribbon 20. The movement direction of the clamping device 54 is different from the movement direction of the film branch 522. For example, the clamping device 54 can be moved along the direction of the film branch 522. Figure 8The third direction D3 shown moves to enter the gap between the adjacent film components 52. It is understandable that, since the clamping device 54 and the film branch 522 are located between the adjacent film bodies 521 during operation, when the clamping device 54 moves to lay the welding ribbon 20, the film branch 522 can be in the second state, thereby providing space for the movement of the clamping device 54 and avoiding interference between the movement of the clamping device 54 and the film branch 522.

[0070] Based on the same concept, a method for coating a photovoltaic module is also provided according to an embodiment of the present application. The method for coating a photovoltaic module can be implemented using the above-mentioned coating equipment. Fig.11 Flow chart of a photovoltaic module coating method provided according to an embodiment of the present application, such as Fig.11 As shown, the photovoltaic module coating method includes the following steps:

[0071] Step S1 , arranging a plurality of battery cells at intervals along a set direction on a carrier 51 . Exemplarily, the set direction is a first direction D1 , and the position of the battery cells on the carrier 51 can be limited by a limiting structure on the carrier 51 .

[0072] Step S2, control the clamping device 54 to move, so as to lay the welding ribbon 20 on multiple battery cells. Exemplarily, after the clamping device 54 clamps the welding ribbon 20, it moves along the third direction D3 to the interval of the film covering component 52. At this time, the film covering branches 522 in the film covering component 52 are all in the second state, and space is reserved for the movement of the clamping device 54. Then the clamping device 54 places the welding ribbon 20 on the battery cell, and then moves out of the interval of the film covering component 52 along the third direction D3. In order to adapt to welding ribbons 20 of different widths and lengths, the opening and closing degree and height of the clamping device 54 can be adjusted to ensure stable clamping and placement of the welding ribbon 20.

[0073] Step S3, control the film laminating component 52 to take the film. Exemplarily, step S3 may specifically include controlling the film laminating component 52 to move to a set position (i.e., a position where the film is placed) along the third direction D3 or other directions perpendicular to the second direction D2, and taking the film in coordination with the movement in the second direction D2. The film laminating component 52 may fix the film on its surface by adsorption, and when adsorbing the film, the driving device 53 may be used to control the film laminating branch 522 to be in the first state.

[0074] Step S4, control the film covering body 521 to place the film so as to cover the film on the battery cell and the welding strip 20 located on the surface of the battery cell. Specifically, the following steps may be included between steps S3 and S4: Step S314, use the driving device 53 to control the film covering branch 522 to be close to the film covering body 521 in the same film covering component 52 and be in the second state; Step S324, move the film covering component 52 in the opposite direction of the moving direction when taking the film to just above the battery cell. Step S4 may specifically include: controlling the film covering component 52 to move in the second direction D2 so that the part of the film adsorbed on the film covering body 521 contacts the battery cell, so that the film covering body 521 can place the part of the film on the battery cell. In step S4, the film covering branch 522 maintains the second state.

[0075] Step S5: Control the film covering branch 522 to place the film so as to cover the film on the intervals between the battery cells. Fig.12 Schematic diagram of the structure of two adjacent laminating components in the laminating device provided according to an embodiment of the present application, such as Fig.12 The two membrane components shown can be Figure 8 For ease of description, any two adjacent laminating components 52 in the laminating device shown in FIG. Fig.12 The two film covering components in the embodiment are respectively referred to as the first film covering component F1 and the second film covering component F2. The first film covering component F1 includes a first film covering body F11 and film covering branches respectively located on two opposite sides of the first film covering body F11. In the embodiment of the present application, the film covering branch located on the side of the first film covering body F11 close to the second film covering component F2 is referred to as the first film covering branch F12; the second film covering component F2 includes a second film covering body F21 and film covering branches respectively located on two opposite sides of the second film covering body F21. In the embodiment of the present application, the film covering branch located on the side of the second film covering body F21 close to the first film covering component F1 is referred to as the second film covering branch F22. The first film covering branch F12 and the second film covering branch F22 are adjacent.

[0076] In some embodiments of the present application, each film covering branch 522 in each film covering component 52 can be controlled to be away from the film covering body 521 at the same time to place the film, so as to Fig.12 For example, the film branches on both sides of the first film body F11 are controlled to be away from the first film body F11 at the same time, and the film branches on both sides of the second film body F21 are controlled to be away from the second film body F21 at the same time, and then the film is placed. Figure 2 or Figure 3 As shown in the assembly, there is no interference between adjacent coating assemblies 52 .

[0077] In other embodiments of the present application, step S5 may include: step S51, controlling the film branch on one side of the film body to move away from the film body and place a film; step S52, controlling the film branch on the other side of the film body to move away from the film body and place a film. Fig.12 For example, first control the first coating branch F12 away from the first coating body F11 and place a film, then control the first coating branch F12 close to the first coating body F11, and then control the second coating branch F22 away from the second coating body F21 and place a film. It should be understood that the motion state of the other coating branch opposite to the first coating branch F12 in the first coating component F1 is consistent with the motion state of the second coating branch F22, and the motion state of the other coating branch opposite to the second coating branch F22 in the second coating component F2 is consistent with the motion state of the first coating branch F12. This method is suitable for forming Figure 4 or Figure 5 The component shown avoids interference between adjacent film coating branches and improves production yield by successively controlling two adjacent film coating branches to place films.

[0078] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module comprises: A plurality of battery cells, wherein the plurality of battery cells are arranged at intervals along a set direction, wherein the set direction is perpendicular to a thickness direction of the battery cells; the plurality of battery cells include at least one group of adjacent first battery cells and second battery cells; a first welding strip, the first welding strip extending along the set direction, the first welding strip being located on the surfaces of the first battery cell and the second battery cell and the interval between the first battery cell and the second battery cell, the first welding strip being used to connect the first battery cell and the second battery cell; a first film covering a surface of the first battery cell and a portion of the first welding strip, wherein an edge of the first film at least on a side close to the second battery cell exceeds an edge of the first battery cell; The second film covers the surface of the second battery cell and a portion of the first welding strip, and the edge of the second film at least on a side close to the first battery cell exceeds the edge of the second battery cell.

2. The photovoltaic module according to claim 1, characterized in that: The adjacent edges of the first film and the second film are connected, or partial regions of the first film and the second film overlap with each other to form an overlapping portion.

3. The photovoltaic module according to claim 2, characterized in that: The photovoltaic module further includes a second welding strip, the second welding strip extends along the set direction, and the interval between two adjacent second welding strips exposes the interval between the first battery cell and the second battery cell; The overlapping portion covers an end portion of the second welding strip located on the surface of the first battery cell, and / or the overlapping portion covers an end portion of the second welding strip located on the surface of the second battery cell.

4. The photovoltaic module according to claim 2, characterized in that: Part of the overlapping portion is located in the interval between the first battery cell and the second battery cell.

5. The photovoltaic module according to any one of claims 2 to 4, characterized in that: The width of the overlapping portion in the set direction is 0.5 mm to 3 mm.

6. The photovoltaic module according to any one of claims 1 to 4, characterized in that: A distance between an edge of the first film close to the second battery cell and an edge of the first battery cell close to the second battery cell in the set direction is less than or equal to 5 mm.

7. The photovoltaic module according to any one of claims 1 to 4, characterized in that: A distance between an edge of the second film close to the first battery cell and an edge of the second battery cell close to the first battery cell in the set direction is less than or equal to 5 mm.

8. A film coating device, characterized in that: The coating device is used to prepare the photovoltaic module according to any one of claims 1 to 7, and the coating device comprises: A carrier platform, used for placing the plurality of battery cells; A plurality of film covering components, wherein the plurality of film covering components are arranged along a set direction, and each of the film covering components comprises a film covering body and two film covering branches, and the two film covering branches are respectively located at two opposite sides of the film covering body; A plurality of driving devices, each of which is connected to one of the laminating branches, and is used to drive the laminating branch to approach or move away from the laminating body; The clamping device is located between adjacent coating components and is used for laying welding strips. The movement direction of the clamping device is different from the movement direction of the coating branches.

9. A method for coating a photovoltaic module, characterized in that: The photovoltaic module coating method is implemented using the coating device according to claim 8, and the photovoltaic module coating method comprises: Arranging the plurality of battery sheets on the carrier at intervals along the set direction; Controlling the movement of the clamping device to lay welding strips on the plurality of battery cells; Controlling the film laminating assembly to take the film; Controlling the film covering body to place the film so as to cover the film onto the battery cell and the welding strip located on the surface of the battery cell; The film covering branch is controlled to place the film so as to cover the film on the intervals between the battery cells.

10. The photovoltaic module coating method according to claim 9, characterized in that: The step of controlling the film-covering branch to place the film comprises: Controlling the film branch on one side of the film body to move away from the film body and place the film; The film branch on the other side of the film body is controlled to be away from the film body and to place the film.

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