Photovoltaic cell string, photovoltaic cell panel and photovoltaic cell module

Abstract

A photovoltaic cell string, a photovoltaic cell panel and a photovoltaic cell module, which are applied to the field of photovoltaic cell preparation. The cell string comprises: a plurality of cells, welding strips, which are arranged on first surfaces and second surfaces of the cells, and protective films, which are arranged on outer sides of the welding strips, wherein there is an overlapping region between adjacent cells among the plurality of cells; and the protective films located on preset cell surfaces of the adjacent cells extend to the overlapping region, such that by using the protective films, the stress generated between the cells and the welding strips in the overlapping region is reduced; the preset cell surfaces are the surfaces of the sides of the adjacent cells where the cells are stacked on each other; and the adjacent cells form an electrical connection by means of the welding strips located on the preset cell surfaces. In the present application, the protective films located on the preset surfaces of the cells in the adjacent cells extend to the overlapping region, such that the stress generated between the cells and the welding strip can be reduced.

Description

Photovoltaic cell string, photovoltaic cell panel and photovoltaic cell assembly

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on December 4, 2023, with application number CN202311642056.2 and invention name “A photovoltaic cell string, photovoltaic cell panel and photovoltaic cell assembly”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of photovoltaic cell preparation, and in particular to a photovoltaic cell string, a photovoltaic cell panel, a photovoltaic cell assembly, and a method for preparing a photovoltaic cell string. Background Art

[0003] Photovoltaic modules are composed of multiple photovoltaic cells interconnected to form a battery string. Multiple battery strings are connected in series and parallel and then packaged to form a power generation module. Usually, there is a certain distance between adjacent cells and adjacent battery strings in a photovoltaic module, which will cause power loss.

[0004] During the photovoltaic cell string formation process, the interconnected soldering of cells requires instant cooling. The sudden temperature change can generate stress between the cells and the ribbons. Therefore, existing technologies typically employ ribbon shaping and segmented ribbons to flatten the ribbons between adjacent cells to reduce stress between them. Alternatively, PET (polyethylene terephthalate) backing strips are used between cells to prevent excessive pressure between the ribbons and the cells. However, ribbon shaping and segmented ribbons are not compatible with thin ribbons, and the segmented ribbon configuration and the use of PET backing strips are difficult to process, resulting in increased costs.

[0005] Summary of the Invention

[0006] In view of this, the purpose of the present application is to provide a photovoltaic cell string, a photovoltaic cell panel, a photovoltaic cell module and a method for preparing a photovoltaic cell string, which solves the problem in the prior art that stress is generated between the cell and the welding ribbon due to rapid temperature changes during welding at the cell interconnection point, reduces the non-power generation area, and solves the problem that hidden cracks in the cell due to excessive pressure between the cell and the welding ribbon during lamination in the overlapping area of ​​the negative spacing component, further improves the power generation efficiency of the component packaging, and at the same time reduces the processing difficulty of component manufacturing, facilitating continuous production.

[0007] To solve the above technical problems, the present application provides a photovoltaic cell string, comprising:

[0008] A plurality of battery cells, solder strips disposed on the first and second surfaces of the battery cells, and a protective film disposed on the outer sides of the solder strips;

[0009] There is an overlapping area between adjacent battery cells in the plurality of battery cells;

[0010] The protective films on the predetermined surfaces of the adjacent cells extend to the overlapping region, so as to reduce the stress generated between the cells and the welding ribbons in the overlapping region by using the protective films; the predetermined surfaces of the cells are the surfaces on one side of the adjacent cells where the cells are stacked;

[0011] The adjacent battery cells are electrically connected using welding strips located on predetermined surfaces of the battery cells.

[0012] Optionally, the protective film of one of the adjacent battery cells located on the predetermined surface of the battery cell extends to the overlapping area.

[0013] Optionally, the protective films of two of the adjacent battery cells located on the predetermined surfaces of the battery cells extend to the overlapping area respectively.

[0014] Optionally, the protective film is a protective film with an intact surface.

[0015] Optionally, the first surface and the second surface of each battery cell are respectively provided with an independent protective film.

[0016] Optionally, the protective film is a polymer film.

[0017] Optionally, the polymer film has a thickness of 50 microns to 150 microns.

[0018] Optionally, the length of the overlapping area between adjacent battery cells is 0.2 mm to 5 mm.

[0019] Optionally, there is a gap area between the edge of the protective film and the edge of the battery cell, so that a predetermined surface portion of the battery cell is exposed.

[0020] Optionally, the gap area is located at opposite edges of the adjacent battery cells.

[0021] Optionally, the width of the gap area is 0.5 mm to 10 mm.

[0022] The present application also provides a photovoltaic panel, comprising:

[0023] A plurality of photovoltaic cell strings as described above;

[0024] A plurality of photovoltaic cell strings are laid and connected to form a photovoltaic cell panel.

[0025] Optionally, there is a cell string overlap region between adjacent cell strings in the plurality of photovoltaic cell strings;

[0026] At least one protective film located on a preset surface of the battery strings in the adjacent battery strings extends to the overlapping area of ​​the battery strings; the preset surface of the battery strings is a side surface where corresponding battery cells in the adjacent battery strings are stacked.

[0027] Optionally, the length of the overlapping area of ​​the battery strings is less than 5 mm.

[0028] The present application also provides another photovoltaic panel, comprising:

[0029] A plurality of photovoltaic cell strings as described above;

[0030] A plurality of photovoltaic cell strings are laid and connected to form a photovoltaic cell panel; there are cell string overlapping areas between adjacent cell strings in the plurality of photovoltaic cell strings;

[0031] The protective film on the preset surface of each battery string in the adjacent battery strings extends to the overlapping area of ​​the battery strings; the preset surface of the battery strings is a side surface where the corresponding battery cells in the adjacent battery strings are stacked on each other.

[0032] The present application also provides a photovoltaic cell assembly, comprising:

[0033] A first panel, a first adhesive film layer, a second panel, a second adhesive film layer, and the photovoltaic cell panel as described above;

[0034] The first adhesive film layer and the second adhesive film layer are respectively arranged on both sides of the photovoltaic cell panel, and the photovoltaic cell panel is sealed in the first adhesive film layer and the second adhesive film layer;

[0035] The first panel is arranged on the outside of the first adhesive film layer, and the second panel is arranged on the outside of the second adhesive film layer.

[0036] The present application also provides a method for preparing a photovoltaic cell string, comprising:

[0037] Grasping the back protective film by negative pressure adsorption, placing the back protective film on the surface of the supporting platform, and fixing the back protective film by negative pressure adsorption;

[0038] placing backside solder strips and battery cells in sequence along a preset direction so that adjacent battery cells among the plurality of battery cells form an overlapping area;

[0039] The front side welding ribbon and the front side protective film are sequentially placed along the preset direction to form a photovoltaic cell string to be laminated; in adjacent cells of the photovoltaic cell string to be laminated, the protective films located on the preset surface of the cell extend to the overlapping area, and the preset surface of the cell is the surface of the side where the cell cells of the adjacent cell strings are stacked on each other;

[0040] The protective film is subjected to a heating and pre-pressing process to obtain the photovoltaic cell string.

[0041] Optionally, after the protective film is subjected to a heating and pre-pressing process to obtain the photovoltaic cell string, the method further includes:

[0042] Protective adhesive film layers are respectively provided on both sides of the photovoltaic cell string, and a lamination process is performed to weld and fix the backside welding strip and the frontside welding strip to the grid lines on the surface of the cell.

[0043] The "back side" and "front side" described in this application are relative to the surface of the carrier platform in production and manufacturing, and have nothing to do with the light-receiving surface or the backlight surface of the solar cell and the module. It can be seen that the photovoltaic cell string provided by this application includes a plurality of cells, welding strips arranged on the first and second surfaces of the cell, and a protective film arranged on the outside of the welding strip. There are overlapping areas between adjacent cells in the plurality of cells. The protective films located on the preset surfaces of the cells in the adjacent cells extend to the overlapping area, so as to utilize the protective film to reduce the stress generated between the cells and the welding strips in the overlapping area. The preset surface of the cell is the surface of one side of the adjacent cells where the cells are stacked on each other. The adjacent cells are electrically connected using the welding strips located on the preset surfaces of the cells. This application reduces the area of ​​the non-power generation area inside the module and reduces the stress generated between the cell and the welding strip by extending the protective films located on the preset surfaces of the cells in the adjacent cells to the overlapping area. At the same time, it can reduce the difficulty of preparing the photovoltaic cell string, reduce the preparation cost, and thus improve the preparation efficiency of the photovoltaic cell string.

[0044] In addition, the present application also provides a photovoltaic cell panel and a photovoltaic cell assembly, which also have the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0046] FIG1 is a schematic structural diagram of a photovoltaic cell string provided in an embodiment of the present application;

[0047] FIG2 is a schematic diagram of a top view of a photovoltaic cell string provided in an embodiment of the present application;

[0048] FIG3 is a schematic structural diagram of a busbar-free cell in a photovoltaic cell string provided by an embodiment of the present application;

[0049] FIG4 is a schematic cross-sectional view of interconnected cells in a photovoltaic cell string according to an embodiment of the present application;

[0050] FIG5 is a schematic structural diagram of another photovoltaic cell string provided in an embodiment of the present application;

[0051] FIG6 is a schematic structural diagram of a photovoltaic cell panel provided in an embodiment of the present application;

[0052] FIG7 is a schematic structural diagram of a photovoltaic cell assembly provided in an embodiment of the present application;

[0053] FIG8 is a flow chart of a method for preparing a photovoltaic cell string provided in an embodiment of the present application;

[0054] In FIG1 to FIG7, the reference numerals are described as follows: 10-cell, 11-cell fine grid line, 12-cell edge blank area, 13-overlapping area;

[0055] 20-welding strip;

[0056] 30-protective film;

[0057] 40-first panel;

[0058] 50-first adhesive film layer;

[0059] 60-second panel;

[0060] 70- second adhesive film layer;

[0061] 80-gap area. DETAILED DESCRIPTION

[0062] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0063] Example 1

[0064] Please refer to Figure 1, which is a schematic diagram of the structure of a photovoltaic cell string provided in an embodiment of the present application. The cell string may include:

[0065] A plurality of battery cells 10, solder strips 20 disposed on the first and second surfaces of the battery cells 10, and a protective film 30 disposed on the outside of the solder strips 20;

[0066] There is an overlapping area between adjacent battery cells 10 in the plurality of battery cells 10;

[0067] The protective film 30 located on the predetermined surface of the cell 10 in adjacent cells 10 extends to the overlapping area, so that the protective film 30 reduces the stress generated between the cell 10 and the solder ribbon 20 in the overlapping area; the predetermined surface of the cell is the surface of one side of the adjacent cells 10 where the cells 10 are stacked on each other;

[0068] Adjacent cells 10 are electrically connected using welding strips 20 located on predetermined surfaces of the cells.

[0069] It should be noted that in this embodiment, a plurality of welding ribbons 20 may be provided on both sides of the plurality of battery cells 10, and a protective film 30 may be provided on the outer side of the plurality of welding ribbons 20, so as to use the protective film 30 to fix the welding ribbons 20 to the surface of the battery cell 10. In this embodiment, in order to reduce the inter-cell spacing between adjacent battery cells 10, the edge areas of the adjacent battery cells 10 connected in series to form a battery string are stacked on each other to form the above-mentioned overlapping area, and the protective film 30 is extended to the above-mentioned overlapping area. This embodiment does not limit the specific structure of the protective film 30 extending into the overlapping area, as long as it can reduce the stress generated between the battery cell 10 and the welding ribbon 20 in the overlapping area. For example, the protective film 30 of one battery cell located on the preset surface of the battery cell between adjacent battery cells 10 may extend to the above-mentioned overlapping area, or the protective films 30 of two battery cells located on the preset surface of the battery cell between adjacent battery cells 10 may extend to the above-mentioned overlapping area respectively. In this embodiment, the welding strips 20 located on the preset surface between adjacent battery cells 10 are interconnected, so that the negative electrode of the battery cell 10 on one side of the adjacent battery cells 10 is connected to the positive electrode of the battery cell 10 on the other side, thereby realizing the series connection of the adjacent battery cells 10. Furthermore, the above-mentioned protective film can be a protective film with a complete surface, or in order to reduce the preparation cost, a protective film with a hollow structure on the surface can also be selected, but in order to ensure the convenience of preparation, the hollow structure provided on the surface of the protective film can be made not to affect the negative pressure adsorption and grasping of the protective film. In this embodiment, the welding strip 20 can be composed of a conductive core and a surface coating, wherein the surface coating melts at the component lamination temperature. The structure of the photovoltaic cell string in this embodiment can refer to Figure 2, which is a schematic diagram of the top view structure of a photovoltaic cell string provided in an embodiment of the present application, wherein the blank area 12 at the edge of the cell is a non-power generation area, that is, the area reduced by overlapping in this application. FIG2 takes the overlapping of three solar cells 10 as an example, including the three solar cells placed as shown in FIG2 (a), (b), and (c), which are connected in series through welding ribbons 20 to form a solar cell string, wherein the cell fine grid lines 11 are the collectors in the solar cells 10, used to collect the photocurrent on the surface of the solar cell. The protective film 30 can be a polymer film covering the surface of the single solar cell 10 for adhering the welding ribbons 20, and adjacent solar cells 10 are stacked on each other. Preferably, each solar cell 10 can be covered with a corresponding polymer film, and the polymer film isolates the adjacent solar cells 10 in the stacking area.

[0070] Accordingly, the present embodiment does not limit the specific material of the protective film 30, as long as the protective film 30 is arranged in the overlapping area and can reduce the stress generated by the adjacent cells 10 and the soldering ribbon 20 in the overlapping area. The present embodiment does not limit the specific thickness of the protective film 30, which can be adjusted according to actual conditions, for example, it can be adjusted according to simulation experiments. The present embodiment also does not limit the specific length of the protective film 30 extending into the overlapping area, for example, it can cover the entire overlapping area. Accordingly, the present embodiment does not limit the specific length of the overlapping area formed, as long as it does not block the light receiving area of ​​the cell 10. In this embodiment, the cell 10 can preferably be a busbarless cell. Please refer to Figure 3 for details. Figure 3 is a schematic structural diagram of a busbarless cell in a photovoltaic cell string provided in an embodiment of the present application, including a cell fine grid line 11. Preferably, it is a double-sided cell such as an HJT cell (HJT cell is a heterojunction cell) or a TOPCon (tunneling oxide passivation contact) cell. The cell 10 is preferably rectangular, less preferably square, and the soldering ribbon 20 can be a copper strip coated with SnBiAg (tin-bismuth-silver) coating.

[0071] Furthermore, the interconnection structure of adjacent cells in this embodiment can be referred to Figure 4, which is a schematic cross-sectional view of interconnected cells in a photovoltaic cell string provided by an embodiment of the present application. It can be seen that adjacent cells can include multiple interconnected solder strips.

[0072] Furthermore, in order to ensure the fixation of the battery cell during the preparation process, a gap area 80 may be provided between the edge of the protective film 30 and the edge of the battery cell 10 so that a predetermined surface portion of the battery cell is exposed.

[0073] In this embodiment, a gap region 80 is formed between the edge of the cell 10 and the edge of the protective film 30 , so that the cell 10 can be adsorbed and fixed by the bottom supporting platform through the gap region 80 during the preparation process, thereby improving the preparation efficiency.

[0074] Furthermore, in order to improve the stability of the adsorption of the battery cells, the gap area 80 may be located at the edges of adjacent battery cells that are opposite to each other.

[0075] In this embodiment, the gap region 80 is provided between the adjacent battery cells at the edges facing each other, so as to facilitate more stable adsorption and fixation of the battery cells.

[0076] Furthermore, in order to ensure that the gap area 80 does not affect other components of the battery cell, the width of the gap area 80 can be 0.5 mm to 10 mm.

[0077] The photovoltaic cell string provided by the embodiment of the present application includes a plurality of cells 10, welding ribbons 20 disposed on the first and second surfaces of the cell 10, and a protective film 30 disposed on the outside of the welding ribbon 20. There is an overlapping region between adjacent cells 10 in the plurality of cells 10. The protective film 30 located on the predetermined surface of the cell 10 in the adjacent cells 10 extends into the overlapping region, so that the protective film 30 can reduce the stress generated between the cell 10 and the welding ribbon 20 in the overlapping region. The predetermined surface of the cell is the side surface of the adjacent cells 10 on which the cell 10 is stacked. The adjacent cells 10 are electrically connected using the welding ribbon 20 located on the predetermined surface of the cell. By extending the protective film 30 located on the predetermined surface of the cell 10 in the adjacent cells 10 to the overlapping region, the present application not only reduces the area of ​​the non-power generation area within the component, but also reduces the stress generated between the cell 10 and the welding ribbon 20. At the same time, it can reduce the difficulty and cost of preparing the photovoltaic cell string, thereby improving the preparation efficiency of the photovoltaic cell string. In addition, the gap area 80 formed by the edge of the battery cell and the edge of the protective film in the embodiment of the present application allows the battery cell to be adsorbed and fixed by the bottom supporting platform through the gap area 80 during manufacturing. The gap area 80 is located at the edges of adjacent battery cells that are opposite to each other, which facilitates more stable adsorption and fixation of the battery cell.

[0078] Example 2

[0079] The photovoltaic cell string provided in this embodiment may include the following structure:

[0080] A plurality of battery cells, welding strips arranged on the first and second surfaces of the battery cells, and a protective film arranged on the outside of the welding strips;

[0081] There are overlapping areas between adjacent battery cells in multiple battery cells;

[0082] The protective film of one of the adjacent cells is located on a predetermined surface of the cell, extending to the overlapping area so as to reduce the stress generated between the cell and the soldering ribbon in the overlapping area by the protective film; the predetermined surface of the cell is the surface of one side of the adjacent cells where the cells are stacked on each other;

[0083] Adjacent cells are electrically connected using welding strips located on predetermined surfaces of the cells.

[0084] It should be noted that in this embodiment, among the adjacent solar cells, a protective film located on a preset surface of the solar cell is selected and extended to the overlapping area. This can reduce the stress generated by the adjacent solar cells and the welding strips in the overlapping area, while reducing the preparation cost, ensuring the preparation thickness of the component, and improving the preparation efficiency of the photovoltaic cell string.

[0085] A photovoltaic cell string provided by an embodiment of the present application includes a plurality of cells, solder strips disposed on first and second surfaces of the cells, and a protective film disposed on the outside of the solder strips. Adjacent cells in the plurality of cells have overlapping regions. A protective film on a predetermined surface of one of the adjacent cells extends into the overlapping region, thereby reducing stress generated between the cells and the solder strips in the overlapping region using the protective film. The predetermined surface of the cell is a surface on which the cells of the adjacent cells are stacked. The adjacent cells are electrically connected using the solder strips on the predetermined surface of the cell. By extending the protective films on the predetermined surfaces of the adjacent cells into the overlapping region, the present application can reduce stress generated between the cells and the solder strips, while also reducing the difficulty of preparing the photovoltaic cell string. Selecting a protective film on the predetermined surface of one cell and extending it into the overlapping region reduces the area of ​​the non-power-generating region within the module, reduces stress generated between the adjacent cells and the solder strips in the overlapping region, and reduces manufacturing costs while ensuring module thickness and improving the efficiency of preparing the photovoltaic cell string.

[0086] Example 3

[0087] Please refer to Figure 5, which is a schematic diagram of the structure of another photovoltaic cell string provided in an embodiment of the present application. The cell string may include:

[0088] A plurality of battery cells 10, solder strips 20 disposed on the first and second surfaces of the battery cells 10, and a protective film 30 disposed on the outside of the solder strips 20;

[0089] There is an overlapping area between adjacent battery cells 10 in the plurality of battery cells 10;

[0090] The protective films 30 of two of the adjacent cells 10 located on the predetermined cell surface extend to the overlapping area, so that the protective films 30 can reduce the stress generated between the cell 10 and the solder ribbon 20 in the overlapping area; the predetermined cell surface is the surface of one side of the adjacent cells 10 where the cell 10 is stacked on each other;

[0091] Adjacent cells 10 are electrically connected using welding strips 20 located on predetermined surfaces of the cells.

[0092] In this embodiment, by extending the protective film 30 of two adjacent cells 10 located on the preset surface of the cell to the overlapping area, the contact between the welding ribbon 20 and the cell 10 can be further blocked, further improving the anti-hidden cracking effect of the photovoltaic cell string. This embodiment does not limit the specific structure of the protective film 30 of two adjacent cells 10 located on the preset surface of the cell to the overlapping area, as long as it can block the contact between the welding ribbon 20 and the cell 10 in the overlapping area. Furthermore, in this embodiment, the thickness of the protective film 30 can be 40 to 120 microns, the diameter of the welding ribbon 20 can be 0.17 to 0.27 mm, and the size of the protective film extending to the overlapping area can deviate by 0.2 mm from the size of the overlapping area.

[0093] Furthermore, in order to ensure the production efficiency of the photovoltaic cell string, the protective film 30 may be a protective film 30 with an intact surface.

[0094] In this embodiment, the protective film 30 is set to a protective film 30 with a complete surface. When preparing a photovoltaic cell string, the protective film 30 can be adsorbed by negative pressure to install and prepare the photovoltaic cell string, thereby improving the degree of automation of the preparation and ensuring the efficiency of preparing the cell string.

[0095] A photovoltaic cell string provided by an embodiment of the present application includes a plurality of cell cells 10, welding strips 20 arranged on the first surface and the second surface of the cell cells 10, and a protective film 30 arranged on the outside of the welding strips 20. There are overlapping areas between adjacent cell cells 10 in the plurality of cell cells 10. The protective films 30 located on the preset surfaces of two cell cells 10 in adjacent cell cells 10 extend to the overlapping areas respectively, so as to utilize the protective films 30 to reduce the stress generated between the cell cells 10 and the welding strips 20 in the overlapping areas. The preset surface of the cell cell is the side surface of the adjacent cell cells 10 where the cell cells 10 are stacked on each other, and the adjacent cell cells 10 are electrically connected using the welding strips 20 located on the preset surface of the cell cell. The present application extends the protective film 30 located on the preset surface of the adjacent cells 10 to the overlapping area, which not only reduces the non-power-generating area inside the component but also reduces the stress generated between the cell 10 and the welding ribbon 20. At the same time, it can reduce the difficulty of preparing the photovoltaic cell string and reduce the preparation cost, thereby improving the preparation efficiency of the photovoltaic cell string. By extending the protective film 30 on the preset surface of the two cells in the adjacent cells 10 to the overlapping area, it not only reduces the non-power-generating area inside the component but also further blocks the contact between the welding ribbon 20 and the cell 10, further improving the anti-hidden crack effect of the photovoltaic cell string. In addition, the embodiment of the present application sets the protective film 30 as a protective film 30 with a complete surface, and can use negative pressure to adsorb the protective film 30, thereby improving the degree of automation of the preparation and ensuring the efficiency of preparing the cell string.

[0096] Example 4

[0097] The photovoltaic cell string provided in this embodiment may include the following structure:

[0098] A plurality of battery cells, welding strips arranged on the first and second surfaces of the battery cells, and a protective film arranged on the outside of the welding strips;

[0099] There are overlapping areas between adjacent battery cells in multiple battery cells;

[0100] The protective films on the predetermined surfaces of the adjacent cells extend to the overlapping area, so as to reduce the stress between the cells and the soldering ribbons in the overlapping area by using the protective films; the predetermined surface of the cells is the surface on the side where the cells of the adjacent cells are stacked;

[0101] Adjacent cells are electrically connected using solder strips located on predetermined surfaces of the cells;

[0102] An independent protective film is respectively provided on the first surface and the second surface of each battery cell.

[0103] It should be noted that in this embodiment, the protective films on the first and second surfaces of each battery cell are set as independent protective films to avoid bending of the protective films and reduce the complexity of preparation. At the same time, the protective films are modularly set so that one side surface of each battery cell corresponds to an independent protective film, which reduces the difficulty of aligning the protective films during installation and improves preparation efficiency.

[0104] The photovoltaic cell string provided by the embodiment of the present application includes a plurality of cells, welding strips disposed on the first and second surfaces of the cells, and a protective film disposed on the outside of the welding strips. There is an overlapping region between adjacent cells in the plurality of cells. The protective films located on the preset surfaces of the cells in the adjacent cells extend to the overlapping region so as to reduce the stress generated between the cells and the welding strips in the overlapping region by using the protective film. The preset surface of the cell is the side surface of the adjacent cells where the cells are stacked and in contact. The adjacent cells are electrically connected using the welding strips located on the preset surfaces of the cells. The first and second surfaces of each cell are respectively provided with an independent protective film. By extending the protective films located on the preset surfaces of the cells in the adjacent cells to the overlapping region, the present application reduces the non-power generation area within the component and reduces the stress generated between the cells and the welding strips. At the same time, it reduces the difficulty and cost of preparing the photovoltaic cell string, thereby improving the preparation efficiency of the photovoltaic cell string. By providing the protective films on the first and second surfaces of each cell as independent protective films, bending of the protective films is avoided, reducing the complexity of preparation.

[0105] Example 5

[0106] The photovoltaic cell string provided in this embodiment may include the following structure:

[0107] A plurality of battery cells, welding strips arranged on the first and second surfaces of the battery cells, and a protective film arranged on the outside of the welding strips;

[0108] There are overlapping areas between adjacent battery cells in multiple battery cells;

[0109] The protective films on the predetermined surfaces of the adjacent cells extend to the overlapping area, so as to reduce the stress between the cells and the soldering ribbons in the overlapping area by using the protective films; the predetermined surface of the cells is the surface on the side of the adjacent cells where the cells are stacked and in contact;

[0110] Adjacent cells are electrically connected using solder strips located on predetermined surfaces of the cells;

[0111] The protective film is a polymer film.

[0112] It should be noted that in this embodiment, by setting the protective film as a polymer film, the stress-reducing effect of the protective film can be guaranteed. The polymer film is easy to process and shape, and the production cost is low, further improving the production efficiency. The polymer film can be made of POE (polyethylene octene elastomer) material. When the polymer film is heated to approximately 140°C, the polymer film and the battery cell are bonded.

[0113] Furthermore, in order to ensure the effect of the polymer film on reducing stress, the thickness of the polymer film can be 50 microns to 150 microns.

[0114] It should be noted that in this embodiment, the thickness of the polymer film is set to 50 microns to 150 microns, so that the polymer film can effectively reduce the stress caused by the sudden temperature drop between adjacent cells and welding strips in the overlapping area, thereby improving the quality rate of the photovoltaic cell string.

[0115] The photovoltaic cell string provided by the embodiment of the present application includes a plurality of cells, welding strips arranged on the first and second surfaces of the cells, and a protective film arranged on the outside of the welding strips. There is an overlapping area between adjacent cells in the plurality of cells. The protective film located on the preset surface of the cells in the adjacent cells extends to the overlapping area, so as to utilize the protective film to reduce the stress generated between the cells and the welding strips in the overlapping area. The preset surface of the cells is the surface of one side of the adjacent cells where the cells are stacked and in contact. The adjacent cells are electrically connected using the welding strips located on the preset surface of the cells. The protective film is a polymer film. The present application reduces the non-power generation area inside the component and reduces the stress generated between the cells and the welding strips by extending the protective film located on the preset surface of the cells in the adjacent cells to the overlapping area. At the same time, it can reduce the difficulty and cost of preparing the photovoltaic cell string, thereby improving the preparation efficiency of the photovoltaic cell string. By configuring the protective film as a polymer film, the stress reduction effect of the protective film can be ensured and the convenience of processing the protective film can be improved. In addition, the embodiment of the present application sets the thickness of the polymer film to 50 microns to 150 microns, which effectively reduces the stress generated between adjacent battery cells and welding ribbons in the overlapping area, and improves the quality rate of photovoltaic cell strings.

[0116] Example 6

[0117] The photovoltaic cell string provided in this embodiment may include the following structure:

[0118] A plurality of battery cells, welding strips arranged on the first and second surfaces of the battery cells, and a protective film arranged on the outside of the welding strips;

[0119] There are overlapping areas between adjacent battery cells in multiple battery cells;

[0120] The protective films on the predetermined surfaces of the adjacent cells extend to the overlapping area, so as to reduce the stress between the cells and the soldering ribbons in the overlapping area by using the protective films; the predetermined surface of the cells is the surface on the side of the adjacent cells where the cells are stacked and in contact;

[0121] Adjacent cells are electrically connected using solder strips located on predetermined surfaces of the cells;

[0122] The length of the overlapping area between adjacent battery cells is 0.2 mm to 5 mm.

[0123] In this embodiment, the length of the overlapping area of ​​adjacent battery cells is set to 0.2 mm to 5 mm, which can reduce the gap between adjacent battery cells and improve the light collection efficiency while ensuring that the light collection area of ​​the battery cell is not blocked.

[0124] The photovoltaic cell string provided by the embodiment of the present application includes a plurality of cells, solder strips disposed on first and second surfaces of the cells, and a protective film disposed on the outer side of the solder strips. There is an overlapping region between adjacent cells in the plurality of cells. The protective film located on the predetermined surface of the cells in the adjacent cells extends into the overlapping region, so that the protective film can reduce the stress generated between the cells and the solder strips in the overlapping region. The predetermined surface of the cells is the side surface of the adjacent cells where the cells are stacked and in contact. The adjacent cells are electrically connected using the solder strips located on the predetermined surface of the cells. The length of the overlapping region of the adjacent cells is 0.2 mm to 5 mm. By extending the protective film located on the predetermined surface of the cells in the adjacent cells into the overlapping region, the present application reduces the non-power generation area within the module and reduces the stress generated between the cells and the solder strips. At the same time, it can reduce the difficulty and cost of manufacturing the photovoltaic cell string, thereby improving the manufacturing efficiency of the photovoltaic cell string. The length of the overlapping region of the adjacent cells is set to 0.2 mm to 5 mm. While ensuring that the light collection area of ​​the cells is not blocked, the gap between adjacent cells is reduced, thereby improving the light collection efficiency.

[0125] To make the embodiments of the present application easier to understand, the photovoltaic cell string may specifically include the following structures:

[0126] A plurality of battery cells, welding strips arranged on the first and second surfaces of the battery cells, and a protective film arranged on the outside of the welding strips; the protective film has a complete surface;

[0127] There are overlapping areas between adjacent battery cells in multiple battery cells;

[0128] The protective films on the predetermined surfaces of the two adjacent cells extend to the overlapping area, so as to reduce the stress between the cell and the soldering ribbon in the overlapping area by using the protective films; the predetermined surface of the cell is the surface on the side of the adjacent cells where the cells are stacked and in contact;

[0129] Adjacent cells are electrically connected using solder strips located on predetermined surfaces of the cells;

[0130] The first surface and the second surface of each cell are respectively provided with an independent protective film; the protective film is a polymer film; the thickness of the polymer film is 50 microns to 150 microns;

[0131] The length of the overlapping area of ​​adjacent battery cells is 0.2 mm to 5 mm;

[0132] A gap area 80 is provided between the edge of the protective film on the predetermined surface of the cell and the edge of the cell, so that the predetermined surface of the cell is partially exposed, so that the cell can be adsorbed and fixed by the bottom support platform through the gap area 80 during manufacturing;

[0133] Furthermore, the gap area 80 is located at the edges of the adjacent battery cells that are opposite to each other; preferably, the edge of the protective film on the back side of the battery cell and the edge of the battery cell are staggered to form a gap area 80, and the gap area 80 is located below the overlapping area of ​​the adjacent battery cells. The width of the gap area 80 is between 0.5 mm and 10 mm, which facilitates the supporting platform to more stably adsorb and fix the battery cells.

[0134] A photovoltaic cell panel provided in an embodiment of the present application is introduced below. The photovoltaic cell panel described below and the photovoltaic cell string described above can be referenced to each other.

[0135] Please refer to FIG6 , which is a schematic structural diagram of a photovoltaic cell panel provided in an embodiment of the present application, which may include: a plurality of photovoltaic cell strings as described above;

[0136] Multiple photovoltaic cell strings are laid and connected to form a photovoltaic cell panel.

[0137] It should be noted that in this embodiment, the above-mentioned multiple photovoltaic cell strings are laid out and connected to form a photovoltaic cell panel. This embodiment does not limit the specific connection method of the multiple photovoltaic cell strings. For example, multiple cell strings can be connected in parallel, or multiple cell strings can be connected in series, which can be set according to the actual working scenario. Among them, Figure 6 takes two groups of photovoltaic cell strings stacked on each other to form a photovoltaic cell panel as an example, including two groups of cell strings placed as shown in (d) and (e) in Figure 6, and the overlapping area 13 is the overlapping area formed by the overlap between adjacent cell strings, and the adjacent cell strings are isolated at the overlapping area 13 by the protective film 30.

[0138] Furthermore, in order to further reduce the gap between adjacent solar cells 10, there may be a solar cell string overlap region 13 between adjacent solar cell strings in the above-mentioned plurality of photovoltaic solar cell strings;

[0139] At least one protective film 30 located on a predetermined surface of the battery string in adjacent battery strings extends to the battery string overlapping region 13 ; the predetermined surface of the battery string is a side surface where corresponding battery cells 10 in adjacent battery strings are stacked.

[0140] It should be noted that in this embodiment, by extending the protective film 30 located on the predetermined surface of adjacent cell strings to the cell string overlap region 13, the stress generated between the adjacent cell strings and the welding ribbon 20 in the cell string overlap region 13 can be reduced, thereby improving the structural stability of the photovoltaic panel. This embodiment does not limit the number of protective films 30 in adjacent cell strings that extend to the cell string overlap region 13. For example, the protective film 30 located on the predetermined surface of one cell string in the adjacent cell strings can be extended to the cell string overlap region 13, or the protective films 30 located on the predetermined surface of two cell strings in the adjacent cell strings can be extended to the cell string overlap region 13 respectively.

[0141] Furthermore, in order to prevent the light receiving areas of the corresponding battery strings between adjacent battery strings from being blocked, the length of the overlapping area of ​​the battery strings may be less than 5 mm.

[0142] It should be noted that, in this embodiment, the length of the overlapping area of ​​the battery strings is set to be less than 5 mm, so as to avoid blocking of the light receiving area by adjacent battery strings.

[0143] The photovoltaic panel provided by the embodiment of the present application includes multiple photovoltaic cell strings as described in the above-mentioned embodiment, and the multiple photovoltaic cell strings are laid out and connected to form a photovoltaic panel; the above-mentioned photovoltaic cell string includes multiple cell pieces 10, welding strips 20 arranged on the first surface and the second surface of the cell piece 10, and a protective film 30 arranged on the outside of the welding strip 20. There is an overlapping area 13 between adjacent cell pieces 10 in the multiple cell pieces 10, and the protective film 30 located on the preset surface of the cell piece 10 in the adjacent cell pieces 10 extends to the overlapping area 13, so as to utilize the protective film 30 to reduce the stress generated between the cell piece 10 and the welding strip 20 in the overlapping area 13. The preset surface of the cell piece is the side surface of the adjacent cell pieces 10 where the cell pieces 10 overlap, and the adjacent cell pieces 10 are electrically connected using the welding strip 20 located on the preset surface of the cell piece 10. In this embodiment, the welding ribbons 20 located on both sides of the predetermined surface between adjacent cells 10 in multiple photovoltaic cell strings are interconnected, so that the negative electrode of the cell 10 on one side of the adjacent cells 10 is connected to the positive electrode of the cell 10 on the other side, thereby achieving a series connection of the adjacent cells 10. In addition, by extending the protective film 30 located on the predetermined surface of the adjacent cell strings to the cell string overlap region 13, the embodiment of the present application not only reduces the non-power generation area within the module, but also reduces the stress generated between the adjacent cell strings and the welding ribbons 20 in the cell string overlap region 13, thereby improving the structural stability of the photovoltaic panel. The length of the cell string overlap region is set to less than 5 mm, which can prevent the adjacent cell strings from blocking the light receiving area.

[0144] Another photovoltaic cell panel provided in an embodiment of the present application is introduced below. The photovoltaic cell panel described below and the photovoltaic cell string described above can refer to each other.

[0145] The photovoltaic panel provided in the embodiments of the present application may include:

[0146] A plurality of photovoltaic cell strings as described above;

[0147] Multiple photovoltaic cell strings are laid and connected to form a photovoltaic cell panel; there are cell string overlap areas between adjacent cell strings in the multiple photovoltaic cell strings;

[0148] The protective film on the preset surface of each battery string in adjacent battery strings extends to the overlapping area of ​​the battery strings; the preset surface of the battery string is the side surface where the corresponding battery cells in the adjacent battery strings are stacked on each other.

[0149] In this embodiment, by extending the protective film on the preset surface of each cell in the adjacent cell strings to the overlapping area of ​​the cell strings, the risk of hidden cracks in the formed photovoltaic panel can be further reduced, and the quality rate of the photovoltaic panel can be improved.

[0150] The photovoltaic panel provided by the embodiments of the present application includes a plurality of photovoltaic cell strings as described above, the plurality of photovoltaic cell strings being laid out and connected to form a photovoltaic panel. Adjacent photovoltaic cell strings within the plurality of photovoltaic cell strings have overlapping regions, and the protective film on the predetermined surface of each cell string within the adjacent cell strings extends into the overlapping region. The predetermined surface of the cell string is the side surface where the corresponding cells in the adjacent cell strings are stacked and in contact. In the embodiments of the present application, the quality rate of the photovoltaic panel is further improved by extending the protective film on the predetermined surface of each cell in the adjacent cell strings to the overlapping region.

[0151] The photovoltaic cell assembly provided in the embodiments of the present application is introduced below. The photovoltaic cell assembly described below and the photovoltaic cell panel described above can be referenced to each other.

[0152] Please refer to FIG7 , which is a schematic diagram of the structure of a photovoltaic cell assembly provided in an embodiment of the present application, which may include:

[0153] A first panel 40, a first adhesive film layer 50, a second panel 60, a second adhesive film layer 70, and the photovoltaic cell panel as described above;

[0154] The first adhesive film layer 50 and the second adhesive film layer 70 are respectively disposed on both sides of the photovoltaic cell panel, and the photovoltaic cell panel is sealed within the first adhesive film layer 50 and the second adhesive film layer 70;

[0155] The first panel 40 is disposed on the outer side of the first adhesive film layer 50 , and the second panel 60 is disposed on the outer side of the second adhesive film layer 70 .

[0156] It should be noted that in this embodiment, a film layer is provided on the outside of the photovoltaic cell panel to encapsulate the photovoltaic cell panel, thereby improving the airtightness of the package. In this embodiment, the first film layer 50 and the second film layer 70 can be formed from transparent polymer materials such as EVA, POE, co-extruded EPE, PVB, or organic silicone. Furthermore, the film layer can be made of POE and EVA. In this embodiment, after the above-mentioned photovoltaic cell assembly is laid, the photovoltaic cell assembly can be laminated. The lamination temperature is higher than the melting point of the low-temperature solder layer. After lamination, electrical interconnection is formed between the cell panels.

[0157] The photovoltaic cell assembly provided by the embodiment of the present application includes a first panel 40, a first adhesive film layer 50, a second panel 60, a second adhesive film layer 70, and a photovoltaic cell panel as described above, wherein the first adhesive film layer 50 and the second adhesive film layer 70 are respectively arranged on both sides of the photovoltaic cell panel, and the photovoltaic cell panel is sealed within the first adhesive film layer 50 and the second adhesive film layer 70, the first panel 40 is arranged on the outside of the first adhesive film layer 50, and the second panel 60 is arranged on the outside of the second adhesive film layer 70; the photovoltaic cell panel includes a plurality of photovoltaic cell strings, and the plurality of photovoltaic cell strings are laid out in conductors to form a photovoltaic cell panel; the above A photovoltaic cell string includes a plurality of cells, a plurality of welding strips arranged on the first and second surfaces of the plurality of cells, and a protective film arranged on the outside of the plurality of welding strips. Adjacent cells in the plurality of cells are overlapped and connected so that the overlapping areas of the adjacent cells form an overlapping area. The protective films located on the preset surfaces of the cells in the adjacent cells extend to the overlapping area so as to utilize the protective film to reduce the stress generated between the cells and the welding strips in the overlapping area. The preset surface is a side surface of the cells in the adjacent cells where the cells are overlapped. The welding strips located on the preset surfaces of the cells in the adjacent cells are connected so that the adjacent cells are connected in series. The protective film of the present application can pre-fix the welding strips and the main grid-free cells, and the fluidity of the protective film is lower than that of the outer packaging film layer, so as to avoid the deviation of the welding strips and reduce the cold solder joints. In addition, by extending the protective film located on the preset surfaces of the cells in the adjacent cells to the overlapping area, the stress generated between the cells and the welding strips can be reduced. At the same time, the difficulty of preparing the photovoltaic cell string can be reduced, the preparation cost can be reduced, and the preparation efficiency of the photovoltaic cell string can be improved.

[0158] The following is an introduction to a method for preparing a photovoltaic cell string provided in an embodiment of the present application. The method for preparing a photovoltaic cell string described below and the photovoltaic cell string described above can be referenced to each other.

[0159] Please refer to FIG8 , which is a flow chart of a method for preparing a photovoltaic cell string according to an embodiment of the present application, which may include:

[0160] S101: Grab the back protective film by negative pressure adsorption, place the back protective film on the surface of the carrier platform, and fix the back protective film by negative pressure adsorption.

[0161] In this embodiment, negative pressure adsorption is used to grab the back protective film to transfer the back protective film to the surface of the carrier platform, and negative pressure adsorption is used to fix the back protective film on the surface of the carrier platform for subsequent alignment and installation, thereby ensuring the degree of automation of preparation and improving preparation efficiency.

[0162] S102: placing backside solder strips and battery cells in sequence along a preset direction so that adjacent battery cells in the plurality of battery cells form overlapping areas.

[0163] In this embodiment, a plurality of adjacent battery cells are overlapped and connected to form an overlapping area, thereby reducing the area of ​​the non-power generation area in the battery cell.

[0164] S103: placing the front side welding strip and the front side protective film in sequence along a preset direction to form a photovoltaic cell string to be pressed; in adjacent cells of the photovoltaic cell string to be pressed, the protective film located on the preset surface of the cell extends to the overlapping area, and the preset surface of the cell is the side surface of the adjacent cell where the cell are stacked on each other.

[0165] The protective film located on the preset surface of the battery cell is extended to the overlapping area, reducing the risk of hidden cracks in the battery cell in the overlapping area.

[0166] S104: The protective film is heated and pre-pressed to obtain a photovoltaic cell string.

[0167] By heating and pre-pressing the protective film, the stability of the photovoltaic cell string structure is ensured, avoiding the displacement of the internal structure in the subsequent preparation process.

[0168] Furthermore, in order to ensure the airtightness of the photovoltaic cell string structure, after the protective film is heated and pre-pressed to obtain the photovoltaic cell string, the following steps may be further included:

[0169] A protective film layer is provided on both sides of the photovoltaic cell string and laminated to ensure that the backside welding strip and the frontside welding strip are welded and fixed to the grid lines on the surface of the cell.

[0170] It should be noted that in this embodiment, a protective film layer is provided on both sides of the photovoltaic cell string, and the protective film layer is laminated, which can weld and fix the back side welding strip and the front side welding strip to the grid line on the surface of the cell at the lamination temperature, further ensuring the stability of the structure.

[0171] The method for preparing a photovoltaic cell string provided by the embodiment of the present application includes grabbing the back protective film by negative pressure adsorption, placing the back protective film on the surface of the supporting platform, and fixing the back protective film by negative pressure adsorption, placing the back welding strip and the cell in sequence along a preset direction so that adjacent cell slices in a plurality of cell slices form an overlapping area, placing the front welding strip and the front protective film in sequence along a preset direction to form a photovoltaic cell string to be pressed; in adjacent cell slices of the photovoltaic cell string to be pressed, the protective film located on the preset surface of the cell extends to the overlapping area, and the preset surface of the cell is the side surface of the adjacent cell slices where the cell slices are stacked on each other, and the protective film is heated and pre-pressed to obtain a photovoltaic cell string. The present application extends the protective film located on the preset surface of the adjacent battery cells to the overlapping area, which not only reduces the area of ​​the non-power generation area inside the component, but also reduces the stress generated between the battery cells and the welding ribbon. At the same time, it can reduce the difficulty of preparing photovoltaic cell strings, reduce the preparation cost, and thus improve the preparation efficiency of photovoltaic cell strings. The present application uses an adsorption and grasping method to grasp the protective film on the back side (the back side refers to the side close to the conveyor belt) and places it on the surface of the preset position of the conveyor belt. The conveyor belt adsorbs the protective film and conveys it, and then aligns it with the preset position to place the back side welding ribbon and battery cells, front side welding ribbon and front side protective film in turn. The manufacturing method has simple adsorption, grasping and alignment, which can improve manufacturing efficiency and yield.

[0172] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. Reference can be made to the descriptions of the identical or similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and the relevant parts can be referred to the descriptions of the methods.

[0173] Finally, it should be noted that, in this document, relationships such as first and second, etc., are used solely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0174] The above is a detailed introduction to a photovoltaic cell string, photovoltaic cell panel, photovoltaic cell assembly and photovoltaic cell string preparation method provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A photovoltaic cell string, characterized in that: include: A plurality of battery cells, welding strips disposed on the first surface and the second surface of the battery cells, and a protective film disposed on the outer side of the welding strips; There are overlapping areas between adjacent battery cells in the plurality of battery cells; The protective film located on the preset surface of the battery cell in the adjacent battery cells extends to the overlapping area, so as to reduce the stress generated between the battery cell and the welding strip in the overlapping area by using the protective film; the preset surface of the battery cell is a side surface of the adjacent battery cells where the battery cells are stacked on each other; The adjacent battery cells are electrically connected using welding strips located on predetermined surfaces of the battery cells.

2. The photovoltaic cell string according to claim 1, characterized in that: The protective film of one of the adjacent battery cells is located on the predetermined surface of the battery cell and extends to the overlapping area.

3. The photovoltaic cell string according to claim 1, characterized in that: The protective films of two of the adjacent battery cells located on the preset surfaces of the battery cells extend to the overlapping areas respectively.

4. The photovoltaic cell string according to claim 1, characterized in that: The protective film is a protective film with a complete surface.

5. The photovoltaic cell string according to claim 1, characterized in that: The first surface and the second surface of each battery cell are respectively provided with an independent protective film.

6. The photovoltaic cell string according to claim 1, characterized in that: The protective film is a polymer film.

7. The photovoltaic cell string according to claim 6, characterized in that: The thickness of the polymer film is 50 micrometers to 150 micrometers.

8. The photovoltaic cell string according to claim 1, characterized in that: The length of the overlapping area of ​​adjacent battery cells is 0.2 mm to 5 mm.

9. The photovoltaic cell string according to claim 1, characterized in that: There is a gap area between the edge of the protective film and the edge of the battery cell, so that the predetermined surface of the battery cell is partially exposed.

10. The photovoltaic cell string according to claim 9, characterized in that: The gap area is located at the edges of the adjacent battery cells that are opposite to each other.

11. The photovoltaic cell string according to claim 10, characterized in that: The width of the gap area is 0.5 mm to 10 mm.

12. A photovoltaic panel, characterized in that: include: A plurality of photovoltaic cell strings according to any one of claims 1 to 11; A plurality of photovoltaic cell strings are laid and connected to form a photovoltaic cell panel.

13. The photovoltaic cell panel according to claim 12, characterized in that: There is a cell string overlap area between adjacent cell strings in the plurality of photovoltaic cell strings; At least one protective film located on a preset surface of the battery string in the adjacent battery strings extends to the overlapping area of ​​the battery strings; the preset surface of the battery string is a side surface where corresponding battery cells in the adjacent battery strings are stacked on each other.

14. The photovoltaic cell panel according to claim 13, characterized in that: The length of the overlapping area of ​​the battery strings is less than 5 mm.

15. A photovoltaic panel, characterized in that: include: A plurality of photovoltaic cell strings according to any one of claims 1 to 11; A plurality of photovoltaic cell strings are laid and connected to form a photovoltaic cell panel; There is a cell string overlap area between adjacent cell strings in the plurality of photovoltaic cell strings; The protective film on the preset surface of each battery string in the adjacent battery strings extends to the overlapping area of ​​the battery strings; the preset surface of the battery string is a side surface where the corresponding battery cells in the adjacent battery strings are stacked on each other.

16. A photovoltaic cell assembly, characterized in that: include: A first panel, a first adhesive film layer, a second panel, a second adhesive film layer, and a photovoltaic cell panel according to any one of claims 12 to 14 or claim 15; The first adhesive film layer and the second adhesive film layer are respectively arranged on both sides of the photovoltaic cell panel, and the photovoltaic cell panel is sealed in the first adhesive film layer and the second adhesive film layer; The first panel is arranged on the outer side of the first adhesive film layer, and the second panel is arranged on the outer side of the second adhesive film layer.

17. A method for preparing a photovoltaic cell string, characterized in that: include: Grasping the back protective film by negative pressure adsorption, placing the back protective film on the surface of the carrier platform, and fixing the back protective film by negative pressure adsorption; Placing the backside welding strips and the battery cells in sequence along a preset direction so that adjacent battery cells among the plurality of battery cells form an overlapping area; The front side welding strip and the front side protective film are sequentially placed along the preset direction to form a photovoltaic cell string to be pressed together; in the adjacent cells of the photovoltaic cell string to be pressed together, the protective film located on the preset surface of the cell extends to the overlapping area, and the preset surface of the cell is the surface of one side of the adjacent cell where the cells are stacked on each other; The protective film is subjected to a heating and pre-pressing treatment to obtain the photovoltaic cell string.

18. The method for preparing a photovoltaic cell string according to claim 17, characterized in that: After the protective film is subjected to a heating and pre-pressing process to obtain the photovoltaic cell string, the method further comprises: Protective adhesive film layers are respectively arranged on both sides of the photovoltaic cell string, and a lamination process is performed to weld and fix the back side welding strip and the front side welding strip to the grid lines on the surface of the cell sheet.

Images