Solar cell module and photovoltaic system

Abstract

The invention provides a solar cell module and a photovoltaic system. According to the solar cell module, a plurality of solar cells in each cell string are connected in series through a first welding strip; the plurality of solar cells in each cell string comprise edge cells and central cells; the first insulating film is arranged on one side, far away from the solar cell, of the first welding strip, and covers at least partial area of the first welding strip of the central cell and at least partial area of the first welding strip of the edge cell; the first insulating film on the edge battery does not cover the preset grid line; the second insulating film of the film-covered confluence assembly is arranged on the first surface of the edge battery, the second welding strip of the film-covered confluence assembly is connected with the grid line exposed on the edge battery, and the second insulating film covers at least partial area of the first welding strip and at least partial area of the second welding strip on the surface of the edge battery. The welding strip can be prevented from being misplaced or moved, and the reliability of the solar cell module is improved.

Description

Technical Field

[0001] This invention relates to the field of solar energy technology, and more particularly to a solar cell module and photovoltaic system. Background Technology

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

[0003] Solar cell modules are composed of several cells connected in series and parallel. The cells are connected in series and parallel by solder ribbons. In the existing technology, the solder ribbons of solar cell modules are prone to misalignment or movement, which affects the reliability of the module. Summary of the Invention

[0004] This invention provides a solar cell module and photovoltaic system to better avoid solder ribbon misalignment or movement, thereby improving the reliability of the solar cell module.

[0005] According to one aspect of the present invention, a solar cell module is provided, comprising:

[0006] Several battery strings, a first insulating film, and a coated busbar assembly;

[0007] Each battery string includes multiple solar cells and multiple first solder strips. The multiple solar cells in each battery string are arranged sequentially along a first direction. The first solder strips are disposed on the first surface of the solar cells, and the multiple solar cells in each battery string are connected in series through the first solder strips.

[0008] Each of the battery strings comprises multiple solar cells including edge cells and a central cell disposed between the edge cells; a first insulating film is disposed on the side of the first solder strip away from the solar cells, the first insulating film covering at least a portion of the first solder strip of the central cell and at least a portion of the first solder strip of the edge cells; the first insulating film on the edge cells does not cover a preset grid line, the preset grid line being a grid line on the edge cell that is not connected to the first solder strip;

[0009] The membrane-coated busbar assembly includes a busbar, multiple second solder strips, and a second insulating film; the multiple second solder strips are connected to the busbar, and the second insulating film is fixedly connected to the multiple second solder strips;

[0010] The second insulating film of the coated busbar assembly is disposed on the first surface of the edge cell. The second solder strip of the coated busbar assembly is electrically connected to a preset grid line. The second insulating film is disposed on the second solder strip and the side of the first insulating film away from the edge cell. The second insulating film covers at least a portion of the first solder strip and at least a portion of the second solder strip on the surface of the edge cell.

[0011] Optionally, the first insulating film disposed on the surface of the edge battery includes a plurality of strip portions spaced apart along the second direction, each strip portion being disposed on a first solder strip surface;

[0012] Along the second direction, the width of the strip portion is greater than the width of the first solder strip; wherein the second direction is perpendicular to the first direction.

[0013] Optionally, along the second direction, the width of the strip portion is greater than or equal to 0.5L and less than or equal to 1.5L; where L is the spacing between adjacent grid lines of different polarities on the edge battery along the second direction.

[0014] Optionally, along the second direction, the spacing between adjacent strips may be equal or unequal.

[0015] Optionally, the first insulating film on the surface of the edge battery and the first insulating film on the surface of the central battery adjacent to the edge battery are interconnected.

[0016] Optionally, in the coated busbar assembly, multiple second solder strips are disposed on the same side of the busbar; the busbar is disposed on the central battery adjacent to the edge battery, and on the side of the first insulating film of the central battery away from the central battery;

[0017] A third insulating film is disposed between the busbar and the first insulating film, and the third insulating film extends from the central battery where the busbar is located to the first surface of the edge battery adjacent to the busbar.

[0018] Optionally, the thickness of the third insulating film is greater than the thickness of the first insulating film.

[0019] Optionally, the thickness of the third insulating film is greater than or equal to 100 micrometers and less than or equal to 250 micrometers;

[0020] The thickness of the first insulating film is greater than or equal to 60 micrometers and less than or equal to 100 micrometers.

[0021] Optionally, the first insulating films of adjacent central batteries are disconnected from each other, or the first insulating films of at least partially adjacent central batteries along the first direction are an integral structure.

[0022] According to another aspect of the present invention, a photovoltaic system is provided, including the solar cell module described in any embodiment of the present invention.

[0023] This invention, through the provision of a first insulating film on the surfaces of the central and edge cells, with the first insulating film on the edge cells not covering the grid lines not connected to the first solder ribbon, achieves fixation of the first solder ribbon on the surfaces of the central and edge cells, preventing the first solder ribbon from detaching or moving. Furthermore, the coated busbar assembly of this invention integrates the busbar, the second solder ribbon, and the second insulating film into a single component. After the coated busbar assembly is placed on the surface of the edge cells, it simultaneously achieves the connection between the second solder ribbon and the edge cells, as well as the fixation of the second and first solder ribbons by the second insulating film. The second insulating film can also fix the second solder ribbon before the coated busbar assembly is placed on the edge cells, thus fixing the gap between the second solder ribbons and their shape, reducing the alignment difficulty when placing the second solder ribbon on the edge cells, and improving the alignment accuracy between the second solder ribbon and the grid lines. Therefore, this invention can better prevent solder ribbon misalignment or movement, improving the reliability of the solar cell module.

[0024] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a solar cell module with a first insulating film provided in an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of a solar cell module provided in an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of a battery string provided in an embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of a battery string after a first insulating film has been applied, provided by an embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of a membrane-coated busbar assembly provided in an embodiment of the present invention.

[0031] Figure 6 This is a schematic diagram of another membrane-coated busbar assembly provided in an embodiment of the present invention.

[0032] Figure 7 This is a schematic diagram of another membrane-coated busbar assembly provided in an embodiment of the present invention.

[0033] Figure 8 This is a schematic diagram of a solar cell module with a partially coated busbar assembly provided in an embodiment of the present invention.

[0034] Figure 9 This is a schematic diagram of a first component.

[0035] Figure 10 This is a schematic diagram of a second component.

[0036] Figure 11 This is a schematic diagram of yet another type of second component.

[0037] Figure 12 This is a schematic diagram of a third component. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] This invention provides a solar cell module. Figure 1 This is a schematic diagram of a solar cell module with a first insulating film provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of a solar cell module provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of a battery string provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of a battery string after the first insulating film has been applied, according to an embodiment of the present invention. Figure 5 This is a schematic diagram of a membrane-coated busbar assembly provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of another membrane-coated busbar assembly provided in an embodiment of the present invention. Figure 7 This is a schematic diagram of another membrane-coated busbar assembly provided in an embodiment of the present invention, with reference to... Figures 1-7 The solar cell module includes:

[0041] A plurality of battery strings 10, a first insulating film 20, and a film-coated busbar assembly 40;

[0042] Each battery string 10 includes multiple solar cells 11 and multiple first solder ribbons 12. The multiple solar cells 11 in each battery string 10 are arranged sequentially along the first direction X. The first solder ribbons 12 are disposed on the first surface of the solar cells 11, and the multiple solar cells 11 in each battery string 10 are connected in series through the first solder ribbons 12.

[0043] Each battery string 10 contains multiple solar cells 11, including edge cells 111 and central cells 112 disposed between the edge cells 111; a first insulating film 20 is disposed on the side of the first solder strip 12 away from the solar cells 11, and the first insulating film 20 covers at least a portion of the first solder strip 12 of the central cell 111 and at least a portion of the first solder strip 12 of the edge cells 112; the first insulating film 20 on the edge cells 111 does not cover the preset grid lines, which are the grid lines 103 on the edge cells that are not connected to the first solder strip 12;

[0044] The membrane-coated busbar assembly 40 includes a busbar 41, multiple second welding strips 42, and a second insulating film 43; the multiple second welding strips 42 are connected to the busbar 41, and the second insulating film 43 is fixedly connected to the multiple second welding strips 42;

[0045] The second insulating film 43 of the coated busbar assembly 40 is disposed on the first surface of the edge battery 111. The second solder strip 42 of the coated busbar assembly 40 is electrically connected to the preset grid line. The second insulating film 43 is disposed on the side of the second solder strip 42 and the first insulating film 20 away from the edge battery 111. The second insulating film 43 covers at least a portion of the first solder strip 12 and at least a portion of the second solder strip 42 on the surface of the edge battery 111.

[0046] The solar cell 11 can be a back-contact solar cell, and the solar cell 11 can include a substrate and a first doped layer, a second doped layer, a first grid line, and a second grid line disposed on one side of the substrate. A cell string 10 can include multiple solar cells 11, and a first solder ribbon 12 is connected to the first grid line or the second grid line of the solar cell 11 to realize the series connection of multiple solar cells 11 in the cell string 10. Two solar cells 11 located at the two edges along the first direction X in a cell string 10 are edge cells 111, and the solar cells 11 other than the edge cells 111 are central cells 112. A second solder ribbon 42 is used to connect the edge cells 111 to the busbar 41. The solar cell module can include multiple cell strings 10, and the multiple cell strings 10 are connected in series and / or in parallel. For example, some cell strings 10 adjacent along the second direction Y are connected in series through a coated busbar assembly 40, and some cell strings 10 adjacent along the first direction X are connected in parallel through a coated busbar assembly 40.

[0047] The first insulating film 20 covers at least a portion of the first surface of the central battery 112, thereby fixing the first solder ribbon 12. For example, the first insulating film 20 can cover the first surface of the central battery 112, specifically the portion of the first solder ribbon 12 located on the first surface. Multiple solar cells 11 can be arranged sequentially along the first direction X, and the first solder ribbon 12 can be placed on the surface of each solar cell 11. After placing the first solder ribbon 12, the first insulating film 20 is placed on the surface of the first solder ribbon 12 of the central battery 112. A certain pressure is applied to the first insulating film 20, and it is heated to fix the first insulating film 20 to the first surface of the solar cell 11.

[0048] The first insulating film 20 also covers at least a portion of the first solder strip 12 of the edge battery 111. Exemplarily, the insulating film 20 on the surface of the edge battery 111 includes a plurality of strips 21, each strip 21 located on the surface of a first solder strip 12, and each strip 21 covering at least a portion of the corresponding first solder strip 12. The first insulating film 20 does not cover the preset grid lines, that is, the first insulating film 20 does not cover the grid lines 103 on the surface of the edge battery 111 that are not connected to the first solder strip 12. The edge battery 111 may have grid lines of two polarities; one polarity of grid line 103 is connected to the first solder strip 12, and the other polarity of grid line 103 is exposed and connected to the coated busbar assembly 40. The first insulating film 20 on the surface of the edge battery 111 may be connected to the first insulating film 20 on the surface of the adjacent central battery 112. The first solder strip 12 is fixed by covering the surface of the central battery 112 and the surface of the edge battery 111 with the first insulating film 20, thus preventing the first solder strip 12 from shifting.

[0049] The second insulating film 43 of the coated busbar assembly 40 is disposed on the first surface of the edge battery 111. The second solder strip 42 of the coated busbar assembly 40 is connected to a preset grid line (i.e., a grid line 103 on the edge battery 111 that is not connected to the first solder strip 12). The second insulating film 43 of the coated busbar assembly 40 covers at least a portion of the second solder strip 42 and at least a portion of the first solder strip 12. For example, the second insulating film 43 may cover the first surface of the edge battery 111, the portion of the first insulating film 20 and the second solder strip 42 located on the first surface, and the portion of the first solder strip 12 and the second solder strip 42 located on the first surface. Pressure and heat may be applied to a portion or the entire second insulating film 43 to fix the second insulating film 43 to the edge battery 111, thereby fixing the first solder strip 12 and the second solder strip 42 on the surface of the edge battery 111.

[0050] In this embodiment of the invention, a first insulating film 20 is provided on the surfaces of the central battery 112 and the edge battery 111. The first insulating film 20 on the edge battery 111 does not cover the grid lines 103 that are not connected to the first solder strip 12, thereby fixing the first solder strip 12 on the surfaces of the central battery 112 and the edge battery 111 and preventing the first solder strip 12 from falling off or moving. In addition, the film-coated busbar assembly 40 of this embodiment integrates the busbar 41, the second solder strip 42 and the second insulating film 43 into a single component, and the film-coated busbar assembly 40 is disposed at the edge. After the second solder ribbon 42 is placed on the surface of the edge cell 111, it can simultaneously connect the second solder ribbon 42 to the edge cell 111 and fix the second solder ribbon 42 and the first solder ribbon 41 with the second insulating film 43. The second insulating film 42 can also fix the second solder ribbon 42 before the coated busbar assembly 40 is placed on the edge cell 111, thus fixing the gap between the second solder ribbons 42 and their shape. This reduces the alignment difficulty when placing the second solder ribbon 42 onto the edge cell 111 and improves the alignment accuracy between the second solder ribbon 42 and the grid lines. Therefore, this embodiment of the invention can better avoid solder ribbon misalignment or movement, improving the reliability of the solar cell module.

[0051] Based on the above embodiments, optionally, the first insulating film 20 disposed on the surface of the edge battery 111 includes a plurality of strip portions 21 disposed at intervals along the second direction Y, and each strip portion 21 is disposed on the surface of a first solder strip 12.

[0052] Along the second direction Y, the width D of the strip 21 is greater than the width of the first solder strip 12; wherein the second direction Y is perpendicular to the first direction X.

[0053] Specifically, each strip 21 is correspondingly disposed on the surface of a first solder strip 12, and the strip 21 serves to fix the first solder strip 12. By setting the width D of the strip 21 along the second direction Y to be greater than the width of the first solder strip 12, the strip 21 extends from the surface of the first solder strip 12 to the first surface of the edge battery 111 along the second direction Y. The strip 21 can cover at least part of the edge of the first solder strip 12, thereby better fixing the first solder strip 12.

[0054] It should be noted that the reference Figure 4 When the number of solar cells included in a battery string 10 is even, the first solder strips covered by the strip portions 21 on the surfaces of the two edge cells 111 at both ends of the battery string 10 have the same polarity, and the coverage positions of the strip portions 21 on the surfaces of the edge cells 111 at both ends of the battery string 10 are the same. For example, when each first solder strip surface is provided with a strip portion 21, the strip portions 21 on the surfaces of the two edge cells 111 at both ends of the battery string 10 can be symmetrically arranged with respect to the symmetry line of the battery string 10, wherein the symmetry line of the battery string 10 extends along the second direction Y.

[0055] When the number of solar cells included in a battery string 10 is odd, the polarity of the first solder strips covering the strip portions 21 of the two edge cells 111 at both ends of the battery string 10 is different, and the positions of the strip portions 21 on the surface of the edge cells 111 at both ends of the battery string 10 are different. For example, the two edge cells 111 at both ends of the battery string 10 are the first cell and the second cell, respectively. The odd-numbered grid lines and even-numbered grid lines on the surfaces of the first cell and the second cell have different polarities, with all odd-numbered grid lines having the first polarity and all even-numbered grid lines having the second polarity. The first solder strip on the surface of the first cell connects to the odd-numbered grid lines, and the first solder strip on the surface of the second cell connects to the even-numbered grid lines. The strip portions on the surfaces of both the first cell and the second cell are provided on the surface of the first solder strip.

[0056] Based on the above embodiments, optionally, along the second direction Y, the width D of the strip portion 21 is greater than or equal to 0.5L and less than or equal to 1.5L; wherein, L is the spacing between adjacent grid lines 103 of different polarities on the edge battery 111 along the second direction Y.

[0057] In some embodiments, the surface of the solar cell 11 includes grid lines of two polarities, which are arranged alternately. For a solar cell with a main grid, the grid line 103 in this embodiment is the main grid connected to the solder ribbon in the solar cell 11. For a solar cell without a main grid, in one case, the extension direction of the solder ribbon is perpendicular to the extension direction of the grid line 103, and one solder ribbon is welded to multiple grid lines 103 through a connection structure on each grid line 103, which can be a pad on the grid line 103; in another case, the extension direction of the solder ribbon is parallel to the extension direction of the grid line 103, and one solder ribbon is welded to one grid line 103.

[0058] If the width D of the strip portion 21 is too small, it cannot effectively fix the first solder strip 12 on the surface of the edge battery 111. If the width D of the strip portion 21 is too large, it may cover the grid line 103 that is not connected to the first solder strip 12 when there is a positional deviation, causing the second solder strip 42 to be unable to connect to the grid line 103, resulting in current not being collected and affecting battery efficiency. By setting the width D of the strip portion 21 to be greater than or equal to 0.5L and less than or equal to 1.5L, while ensuring that the first insulating film 20 can effectively fix the first solder strip 12, it can avoid the strip portion 21 covering the grid line 103 that is not connected to the first solder strip 12 when there is a positional deviation, thus preventing the second solder strip 42 from being unable to connect to the grid line 103, resulting in current not being collected and affecting battery efficiency.

[0059] Based on the above embodiments, optionally, the spacing between adjacent strip portions 21 along the second direction Y is equal or unequal.

[0060] Specifically, the spacing of the strip portions 21 can be set according to the spacing between adjacent grid lines 103 of different polarities along the second direction Y on the edge battery 111 and the width D of the strip portions 21. When the spacing between adjacent grid lines 103 of different polarities is equal, the spacing between adjacent strip portions 21 is equal. When the spacing between adjacent grid lines 103 of different polarities is unequal, the spacing between adjacent strip portions 21 is unequal.

[0061] Based on the above embodiments, optionally, the first insulating film 20 on the surface of the edge battery 111 and the first insulating film 20 on the surface of the central battery 112 adjacent to the edge battery 111 are connected to each other.

[0062] Specifically, such as Figure 4 As shown, the multiple strip sections 21 are integrally formed with the first insulating film 20 located on the surface of the central battery 112. This arrangement makes the positions of the multiple strip sections 21 relatively fixed, reducing the difficulty of placing the first insulating film 20 on the edge batteries 111 and improving the accuracy of the film coating position of the strip sections 21.

[0063] Based on the above embodiments, optionally, in the coated busbar assembly 40, multiple second welding strips 42 are disposed on the same side of the busbar 41; the busbar 41 is disposed on the central battery 112 adjacent to the edge battery 111, and is disposed on the side of the first insulating film 20 of the central battery 112 away from the central battery 112.

[0064] A third insulating film 30 is provided between the busbar 41 and the first insulating film 20, and the third insulating film 30 extends from the central battery 112 where the busbar 41 is located to the first surface of the edge battery 111 adjacent to the busbar 41.

[0065] For details, please refer to Figure 1 After a first insulating film 20 is provided on the central battery 112 of the battery string 10, a third insulating film 30 is provided on the surface of the first insulating film 20 of the central battery 112 where the busbar 41 needs to be installed. (Reference) Figure 2 The coated busbar assembly 40 is disposed on the surface of the edge battery 111, so that the second solder strip 42 of the coated busbar assembly 40 is connected to the grid line of the edge battery 111, and the second insulating film 42 of the coated busbar assembly 40 is fixedly connected to the edge battery 111.

[0066] refer to Figure 2 , Figures 5-7 Multiple second solder strips 42 are disposed on the same side of the busbar 41 and connected to the busbar 41. That is, multiple second solder strips 42 extend along the first direction X, and the busbar 41 extends along the second direction Y. Along the first direction X, the second solder strips 42 are disposed on the same side of the busbar 41. This arrangement allows the busbar 41 to be disposed on the surface of the central battery 112 adjacent to the edge battery 111 after the coated busbar assembly 40 is disposed on the surface of the edge battery 111. This allows the second solder strips 42 to be fully connected to the exposed grid lines 103 on the edge battery 111. This avoids the situation where the grid lines 103 located below the busbar 41 cannot be connected to the second solder strips 42 when the busbar 41 is disposed on the surface of the edge battery 111, which would result in some current not being collected or affecting the current collection efficiency.

[0067] For example, in a gridless solar cell, when the extension direction of the solder ribbon is perpendicular to the extension direction of the grid line 103, and a solder ribbon is welded to multiple grid lines 103 through the connection structure on each grid line 103, if the busbar 41 is located on the surface of the edge cell 111, the connection structure located below the busbar 41 cannot be connected to the second solder ribbon 42, resulting in the current of the grid line connected to the connection structure not being collected.

[0068] Furthermore, the third insulating film 30 extends from the central battery 112 where the busbar 41 is located to the first surface of the edge battery 111 adjacent to the busbar 41. That is, the third insulating film 30 covers a designated area on the central battery 112 where the busbar 41 is located, the gap between the central battery 112 and the edge battery 112, and at least a portion of the first surface of the edge battery 111 adjacent to the central battery 112. The busbar 41 is located within the designated area, and the designated area includes a first edge and a second edge opposite each other along a first direction. The second edge is located at the edge of the central battery 112 adjacent to the edge battery 111, and the first edge is located on the side of the busbar 41 away from the edge battery. This arrangement ensures that the second solder strip 42 is insulated from the heterogeneous grid lines of the central battery 112 where the busbar 41 is located, preventing short circuits.

[0069] The following is a brief description of the entire manufacturing process of the battery assembly:

[0070] 1. Arrange solar cells into strings.

[0071] 2. Place the first solder strip on the second preset grid line area of ​​the preset battery, apply the first insulating film, and pre-fix it by heating. The second preset grid line is the grid line that needs to be connected to the first solder strip.

[0072] 3. Lay the coated battery string (the battery string after the first insulating film is applied) on the front panel and the front adhesive film assembly according to the preset layout, and at the same time fix the coated battery string by hot stamping according to the preset hot stamping area, so that the solar cell is fixed to the front adhesive film.

[0073] 4. Lay the third insulating film in the preset area of ​​the arranged battery components.

[0074] 5. Weld the second welding strip to the busbar, and at the same time lay the second insulating film to fix the second welding strip, forming a membrane busbar assembly.

[0075] 6. After the third insulating film is applied, apply the film-coated busbar assembly to the battery assembly and fix it with hot stamping to fix the busbar and the third insulating film, and fix the second insulating film and the edge battery.

[0076] 7. After laying the adhesive film and backsheet, the battery assembly to be laminated is obtained.

[0077] 8. Lamination is performed by welding the solder strip and the solar cell to obtain a cell laminate. For example, the lamination temperature can be 145°C-155°C.

[0078] 9. Install the junction box, frame, and solidify to obtain the battery assembly.

[0079] Based on the above embodiments, optionally, the thickness of the third insulating film 30 is greater than the thickness of the first insulating film 20.

[0080] Specifically, a first insulating film 20 and a third insulating film 30 are located between the busbar 41 and the first solder strip 12. The first insulating film 20 serves to fix the first solder strip 12, while the third insulating film 30 mainly serves an insulating function, insulating the busbar 41 and the surface of the first solder strip 12 of the central cell 112. By setting the thickness of the third insulating film 30 to be greater than that of the first insulating film 20, the third insulating film 30 can provide better insulation, thereby improving the reliability of the solar cell module.

[0081] Based on the above embodiments, optionally, the thickness of the third insulating film 30 is greater than or equal to 100 micrometers and less than or equal to 250 micrometers;

[0082] The thickness of the first insulating film 20 is greater than or equal to 60 micrometers and less than or equal to 100 micrometers.

[0083] Specifically, if the thickness of the first insulating film 20 is too small, it will increase the difficulty of lamination and may not provide a good fixing effect. If the thickness of the first insulating film 20 is too large, it will increase the thickness of the entire battery assembly and cause material waste. By setting the thickness of the first insulating film 20 to be greater than or equal to 60 micrometers and less than or equal to 100 micrometers, the lamination difficulty of the first insulating film 20 can be reduced while ensuring that the first insulating film 20 can provide a good fixing effect, and the battery assembly can be kept to a smaller thickness, thus reducing material costs.

[0084] If the thickness of the third insulating film 30 is too small, it cannot provide adequate insulation. If the thickness of the third insulating film 30 is too large, it will cause an excessive height difference when the second solder ribbon 42 extends from the surface of the busbar 41 to the first surface of the edge cell 111, resulting in significant bending of the second solder ribbon 42 and affecting its service life. By setting the thickness of the third insulating film 30 to be greater than or equal to 100 micrometers and less than or equal to 250 micrometers, while ensuring that the third insulating film 30 can provide adequate insulation, the height difference when the second solder ribbon 42 extends from the surface of the busbar 41 to the first surface of the edge cell 111 can be reduced, thus avoiding significant bending of the second solder ribbon 42, extending its service life, and improving the reliability of the solar cell module.

[0085] Based on the above embodiments, optionally, the first insulating film 20 and the second insulating film 43 are made of the same material.

[0086] Specifically, both the first insulating film 20 and the second insulating film 43 serve to fix the welding strip. By using the same material for the first insulating film 20 and the second insulating film 43, costs can be reduced. Furthermore, both films can be coated using the same coating process and fixed using the same fixing process (e.g., they can be heated to the same temperature under the same pressure), which reduces process costs.

[0087] Based on the above embodiments, optionally, the first insulating films 20 of adjacent central batteries 112 are disconnected from each other, or at least some of the first insulating films 20 of adjacent central batteries 112 are an integral structure.

[0088] Specifically, the first insulating film 20 of adjacent central batteries 112 is disconnected from each other, that is, each central battery 111 has its own first insulating film 20. At least some of the first insulating films 20 of adjacent central batteries 112 are integral structures, that is, some of the adjacent central batteries 112 use the same first insulating film 20. For example, two central batteries 11 can use one first insulating film 20, or multiple central batteries 111 can use one first insulating film 20.

[0089] The smaller first insulating film 20 adheres more smoothly to the battery after being applied, and is less prone to bulging. Therefore, the first insulating films 20 of adjacent central batteries 112 are disconnected from each other, which can prevent the first insulating film 20 from bulging and causing the first solder strip 12 to detach from the central battery 112.

[0090] Two or more central batteries 112 use a larger first insulating film 20, which allows two or more central batteries 112 to be coated together, reducing the number of coating times and improving coating efficiency.

[0091] Figure 8 This is a schematic diagram of a solar cell module with a partially coated busbar assembly provided in an embodiment of the present invention. Figure 9 This is a schematic diagram of a first component. Figure 10 This is a schematic diagram of a second component. Figure 11 This is a schematic diagram of yet another type of second component. Figure 12 This is a schematic diagram of a third component. (Reference) Figures 5-12 Based on the above embodiments, optionally, the membrane-covered manifold assembly 40 includes a first component 401, a second component 402, and a third component 403.

[0092] The solar cell module includes a first edge 101 and a second edge 102 opposite each other along a first direction X.

[0093] The second insulating film 43 of the first component 401 is disposed on the surface of the edge battery 111 at the first edge 401 or the second edge 402. The first component 401 is used to connect two adjacent battery strings 10 along the second direction Y. The second insulating film 43 of the second component 402 and the third component 403 is disposed on the surface of the adjacent edge battery 111 of the adjacent battery strings 10. The second component 402 is used to connect four battery strings 10 arranged in an array along the first direction X and the second direction Y. The third component 403 is used to connect two adjacent battery strings 10 along the first direction X. The first direction X and the second direction Y are perpendicular to each other.

[0094] The second insulating film 43 of the first component 401 includes two first sub-films 431 spaced apart along the second direction Y, each first sub-film 431 covering an edge battery 111. Figure 5 Alternatively, the first component 401 may include only one second insulating film 43, which covers all edge cells connected to the first component 401. Figure 9 );

[0095] The second insulating film 43 of the second component 402 includes two second sub-films 432 spaced apart along the first direction X, each second sub-film 432 covering two adjacent edge cells along the second direction Y. Figure 10 Alternatively, the second insulating film 43 of the second component 402 includes two third sub-films 433 spaced apart along the second direction Y, each third sub-film 433 covering two adjacent edge cells 111 along the first direction X. Figure 11 Alternatively, the second insulating film 43 of the second component 402 includes four fourth sub-films 434 arranged in an array, each fourth sub-film 434 covering an edge cell. Figure 6 Alternatively, the second component 402 may include only one second insulating film 43, which covers all edge cells connected to the second component 402.

[0096] The second insulating film 43 of the third component 403 includes two fifth sub-films 435 spaced apart along the first direction X, each fifth sub-film 435 covering an edge cell 111. Figure 7 Alternatively, the third component 403 may consist of only one second insulating film 43, which covers all edge cells 111 connected to the third component 403. Figure 12 ).

[0097] Specifically, each coated busbar assembly 40 may include a single piece of second insulating film 43, which covers all edge cells 111 connected to the coated busbar assembly 40, such as... Figure 9 and Figure 12As shown, the second insulating film 43 of the first component 401 covers two adjacent edge cells, and the second insulating film 43 of the third component 403 covers two adjacent edge cells. Each coated busbar assembly 40 may include a single piece of second insulating film 43, such that the second insulating film 43 fixes the positions of all the second solder strips 42 of the coated busbar assembly 40, reducing the alignment difficulty when the coated busbar assembly 40 is attached to the edge cells.

[0098] The second insulating film 43 of each membrane busbar assembly 40 can also be divided into several sub-films, each sub-film corresponding to cover an edge battery. This arrangement can avoid the second insulating film 43 being too large, causing bulges when it is attached to the edge battery, which would cause the bulges to cause the second solder strip 42 to shift.

[0099] Optionally, the length of the second solder strip 42 of the first component 401 is less than the length of the second solder strip 42 of the second component 402; and the length of the second solder strip 42 of the first component 401 is less than the length of the second solder strip 42 of the third component 403.

[0100] Specifically, the second solder strip 42 extends along the first direction X, and the length of the second solder strip 42 is the dimension of the second solder strip 42 along the first direction X. The first component 401 is used to connect two adjacent battery strings 10 along the second direction Y. The second solder strip 42 of the first component 401 only needs to connect one edge battery 111 along the first direction X, and the length of the second solder strip 42 of the first component 401 is close to the dimension of one edge battery 111 along the first direction X. The second component 402 and the third component 403 both connect adjacent edge batteries 111 along the first direction X. The second solder strip 42 of the second component 402 and the third component 403 need to connect two edge batteries 111 along the first direction X, and the length of the second solder strip 42 of the second component 402 and the third component 403 is close to the dimension of two edge batteries 111 along the first direction X.

[0101] Based on the above embodiments, optionally, refer to Figure 2 Two adjacent battery strings 10 along the second direction Y are connected in series through a membrane busbar assembly 40, and two adjacent battery strings 10 along the first direction X are connected in parallel through a membrane busbar assembly 40.

[0102] Specifically, along the second direction Y, every two adjacent battery strings 10 are connected in series through a membrane busbar assembly 40, and then connected in parallel through membrane busbar assemblies 40 disposed between adjacent battery strings 10.

[0103] This application also provides a photovoltaic system, including the solar cell module described in the above embodiments.

[0104] Photovoltaic systems can be applied in photovoltaic power plants, such as ground-mounted, rooftop, and floating power plants, as well as in equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it's understandable that the application scenarios of photovoltaic systems are not limited to these; that is, photovoltaic systems can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation network as an example, a photovoltaic system can include photovoltaic arrays, combiner boxes, and inverters. A photovoltaic array can be a combination of multiple battery modules; for example, multiple battery modules can form multiple photovoltaic arrays. The photovoltaic arrays are connected to combiner boxes, which collect the current generated by the photovoltaic arrays. The collected current flows through an inverter and is converted into AC power required by the mains grid before being connected to the mains grid to achieve solar power supply.

[0105] The beneficial effects of the photovoltaic system in this embodiment are equivalent to the beneficial effects of the battery module described above, and will not be repeated here.

[0106] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0107] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A solar cell module, characterized in that, include: Several battery strings, a first insulating film, and a coated busbar assembly; Each battery string includes multiple solar cells and multiple first solder strips. The multiple solar cells in each battery string are arranged sequentially along a first direction. The first solder strips are disposed on the first surface of the solar cells, and the multiple solar cells in each battery string are connected in series through the first solder strips. Each of the battery strings comprises multiple solar cells including edge cells and a central cell disposed between the edge cells; a first insulating film is disposed on the side of the first solder strip away from the solar cells, the first insulating film covering at least a portion of the first solder strip of the central cell and at least a portion of the first solder strip of the edge cells; the first insulating film on the edge cells does not cover a preset grid line, the preset grid line being a grid line on the edge cell that is not connected to the first solder strip; The membrane-coated busbar assembly includes a busbar, multiple second solder strips, and a second insulating film; the multiple second solder strips are connected to the busbar, and the second insulating film is fixedly connected to the multiple second solder strips; The second insulating film of the coated busbar assembly is disposed on the first surface of the edge cell. The second solder strip of the coated busbar assembly is electrically connected to a preset grid line. The second insulating film is disposed on the second solder strip and the side of the first insulating film away from the edge cell. The second insulating film covers at least a portion of the first solder strip and at least a portion of the second solder strip on the surface of the edge cell.

2. The solar cell module according to claim 1, characterized in that: The first insulating film disposed on the surface of the edge battery includes a plurality of strip portions spaced apart along the second direction, each strip portion being disposed on a first solder strip surface; Along the second direction, the width of the strip portion is greater than the width of the first solder strip; wherein the second direction is perpendicular to the first direction.

3. The solar cell module according to claim 2, characterized in that: Along the second direction, the width of the strip portion is greater than or equal to 0.5L and less than or equal to 1.5L; where L is the spacing between adjacent grid lines of different polarities on the edge battery along the second direction.

4. The solar cell module according to claim 2, characterized in that: Along the second direction, the spacing between adjacent strips may be equal or unequal.

5. The solar cell module according to claim 1, characterized in that: The first insulating film on the surface of the edge battery and the first insulating film on the surface of the central battery adjacent to the edge battery are connected to each other.

6. The solar cell module according to claim 1, characterized in that: In the membrane-coated busbar assembly, multiple second solder strips are disposed on the same side of the busbar; the busbar is disposed on the central battery adjacent to the edge battery, and on the side of the first insulating film of the central battery away from the central battery; A third insulating film is disposed between the busbar and the first insulating film, and the third insulating film extends from the central battery where the busbar is located to the first surface of the edge battery adjacent to the busbar.

7. The solar cell module according to claim 6, characterized in that: The thickness of the third insulating film is greater than the thickness of the first insulating film.

8. The solar cell module according to claim 7, characterized in that: The thickness of the third insulating film is greater than or equal to 100 micrometers and less than or equal to 250 micrometers; The thickness of the first insulating film is greater than or equal to 60 micrometers and less than or equal to 100 micrometers.

9. The solar cell module according to claim 1, characterized in that: The first insulating films of adjacent central batteries are disconnected from each other, or the first insulating films of at least some of the central batteries adjacent along the first direction are an integral structure.

10. A photovoltaic system, characterized in that, Includes the solar cell module as described in any one of claims 1-9.

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