All-black double-glass photovoltaic module

Abstract

The utility model relates to the photovoltaic field, and discloses an all-black double-glass photovoltaic module which comprises an adhesive film gasket, a back glass substrate, a back packaging layer, a battery piece layer, a front packaging layer and a front glass substrate, the battery piece layer comprises a welding strip, a plurality of battery strings, a bus bar for connecting the plurality of battery strings and a black shielding strip; the black shielding strip is positioned on the surface, facing the front glass substrate, of the bus bar; the adhesive film gaskets are located between the front glass substrate and the back glass substrate, are located in the plane where the battery piece layer is located, and are distributed around the four edges of the battery piece layer. The black shielding strip is arranged, the bus bar does not need to be coated with black pigment, the problems of paint peeling, whitening, photovoltaic module pollution and the like caused by bending of the bus bar are solved, and meanwhile the color uniformity of the photovoltaic module is guaranteed. The adhesive film gasket arranged around the all-black double-glass photovoltaic module can increase the weight of an adhesive film in the all-black double-glass photovoltaic module, so that the problem that bubbles are easy to appear is solved.

Description

Technical Field

[0001] The present application relates to the photovoltaic field, and in particular to an all-black double-glass photovoltaic module. Background Art

[0002] In order to meet the application needs of photovoltaic modules in buildings, all-black photovoltaic modules came into being. At present, in all-black photovoltaic modules, black pigment is coated on the surface of the busbar to achieve full black, but there are also some problems. For example, first, the busbar coated with black pigment cannot be bent. After bending, the busbar coated with black pigment will have problems such as paint falling off and whitening, resulting in uneven color; second, the fallen black pigment exists in the photovoltaic module, causing black foreign matter to pollute the photovoltaic module. In addition, all-black photovoltaic modules are generally single-glass modules. Since the weight of the film applied on the front and back of the double-glass module is relatively low, bubbles are prone to appear.

[0003] Therefore, how to solve the above technical problems should be the focus of technical personnel in this field. Summary of the invention

[0004] The purpose of the present application is to provide a fully black double-glass photovoltaic module to obtain a double-glass module with a fully black effect, while improving the problem of bubbles that are prone to occur due to the low grammage of the film.

[0005] In order to solve the above technical problems, the present application provides a full black double-glass photovoltaic module, comprising:

[0006] Adhesive film gasket, back glass substrate, back encapsulation layer, battery cell layer, front encapsulation layer and front glass substrate stacked in sequence;

[0007] The battery sheet layer includes a welding strip, a plurality of battery strings, a bus bar connecting the plurality of battery strings, and a black shielding bar, wherein the black shielding bar is located on a surface of the bus bar facing the front glass substrate;

[0008] The adhesive film gasket is located between the front glass substrate and the back glass substrate, and the adhesive film gasket is located within the plane where the battery layer is located, and is distributed around the four edges of the battery layer.

[0009] Optionally, the adhesive film gasket, the back side encapsulation layer, and the front side encapsulation layer are an integrated structure.

[0010] Optionally, the adhesive film gasket, the back side packaging layer, and the front side packaging layer are separated structures.

[0011] Optionally, the thickness of the adhesive film gasket is greater than or equal to a target thickness, where the target thickness is the thickness of the back encapsulation layer and the thickness of the front encapsulation layer.

[0012] Optionally, when the thickness of the adhesive film gasket is greater than the target thickness, the thickness of the adhesive film gasket increases sequentially in a direction away from the battery layer.

[0013] Optionally, the black shielding strip includes an adhesive layer, a support layer and a black coating layer stacked in sequence from bottom to top.

[0014] Optionally, the black coating includes a black insulating organic coating or a black pigment layer.

[0015] Optionally, the black shielding strip is connected to the bus bar by welding or bonding.

[0016] Optionally, the battery string includes a plurality of battery cells, and the battery cells are busbar-less battery cells.

[0017] Optionally, the back side encapsulation layer is a black encapsulation layer or a transparent encapsulation layer.

[0018] Optionally, also include:

[0019] A flexible insulating layer is provided between the bus bar and the black shielding strip.

[0020] The present application provides an all-black double-glass photovoltaic module, comprising: a film gasket, a back glass substrate, a back packaging layer, a battery layer, a front packaging layer and a front glass substrate stacked in sequence; the battery layer comprises a welding strip, a plurality of battery strings, a bus bar connecting the plurality of battery strings and a black shielding strip, the black shielding strip is located on the surface of the bus bar facing the front glass substrate; the film gasket is located between the front glass substrate and the back glass substrate, and the film gasket is located within the plane where the battery layer is located, and is distributed around the four edges of the battery layer.

[0021] It can be seen that the all-black double-glass photovoltaic module in this application is provided with a black shielding strip on the surface of the bus bar facing the front glass substrate, and the bus bar does not need to be coated with black pigment, thereby avoiding problems such as paint peeling, whitening, and pollution of the photovoltaic module when the bus bar is bent, while ensuring the color uniformity of the photovoltaic module. In addition, in the all-black double-glass photovoltaic module of this application, a film gasket is also provided around the all-black double-glass photovoltaic module, which can increase the weight of the film in the all-black double-glass photovoltaic module, thereby improving the problem of bubbles in the all-black double-glass photovoltaic module due to the low gram weight of the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic cross-sectional view of a fully black double-glass photovoltaic module provided in an embodiment of the present application Figure 1 ;

[0024] Figure 2 A top view of an all-black double-glass photovoltaic module provided in an embodiment of the present application;

[0025] Figure 3 A schematic diagram of a busbar-free solar cell provided in an embodiment of the present application;

[0026] Figure 4 A schematic cross-sectional view of a black shielding strip provided in an embodiment of the present application;

[0027] Figure 5 A schematic cross-sectional view of a fully black double-glass photovoltaic module provided in an embodiment of the present application Figure 2 ;

[0028] In the figure, 1. front glass substrate, 2. front encapsulation layer, 3. black shielding strip, 4. bus bar, 5. back encapsulation layer, 6. back glass substrate, 7. film gasket, 8. battery cell, 9. flexible insulation layer, 31. black coating, 32. support layer, 33. adhesion layer, 81. fine grid line. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] As mentioned in the background technology section, in current all-black photovoltaic modules, black pigment is applied on the surface of the busbar to achieve full blackness. If the busbar is bent, there will be problems such as uneven color and fallen black pigment contaminating the module. In addition, since the weight of the film applied on the front and back of the double-glass module is relatively low, bubbles are prone to appear.

[0032] In view of this, this application provides a full black double glass photovoltaic module, please refer to Figure 1 to Figure 2 ,include:

[0033] Adhesive film gasket 7, back glass substrate 6, back encapsulation layer 5, battery layer, front encapsulation layer 2 and front glass substrate 1 stacked in sequence;

[0034] The battery layer includes a welding strip, a plurality of battery strings, a bus bar 4 connecting the plurality of battery strings, and a black shielding strip 3, wherein the black shielding strip 3 is located on the surface of the bus bar 4 facing the front glass substrate 1;

[0035] The adhesive film gasket 7 is located between the front glass substrate 1 and the back glass substrate 6 , and the adhesive film gasket 7 is located within the plane where the battery layer is located, and is distributed around the four edges of the battery layer.

[0036] The back glass substrate 6 may be a tempered glass substrate to enhance the mechanical properties and impact resistance of the all-black double-glass photovoltaic module, thereby extending the service life of the all-black double-glass photovoltaic module.

[0037] It should be noted that the color of the back encapsulation layer 5 of the all-black double-glass photovoltaic module is not limited in this application and can be set according to needs and usage scenarios. For example, the back encapsulation layer 5 is a black encapsulation layer or a transparent encapsulation layer.

[0038] The front glass substrate 1, the cell layer and the back glass substrate 6 are bonded together during the lamination process by the front encapsulation layer 2 and the back encapsulation layer 5. The front encapsulation layer 2 and the back encapsulation layer 5 include but are not limited to POE ((Poly (ethylene-1-octene), ethylene-butylene copolymer)) encapsulation layer and EVA (ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer) encapsulation layer.

[0039] Each cell string in the cell layer includes a plurality of cells 8. The number of cells 8 in each cell string is not limited in this embodiment and is determined according to the size of the cell 8 and the size of the all-black double-glass photovoltaic module.

[0040] As an implementation method, the battery cell 8 is a busbar-free battery cell, such as Figure 3As shown, the main grid line is cancelled on the battery cell 8, and only a fine grid line 81 is provided, which visually solves the visual graying and whitish problems caused by the screen problem, and further improves the black effect of the component. Among them, the fine grid line 81 is used for diversion to ensure the efficiency of the battery cell 8 and the power of the all-black double-glass photovoltaic component. The types of main grid-free cells include but are not limited to TOPCon cells (Tunnel Oxide Passivated Contact solar cell), PERC cells (Passivated Emitter and Rear Cell), HJT cells (Hereto-junction with Intrinsic Thin-layer, intrinsic thin film heterojunction cells), and XBC cells (back contact photovoltaic cells). There are two ways to prepare samples of main grid-free battery cells, one is to use the battery surface coating process, and the other is to use UV glue to glue the battery to conduct.

[0041] As another possible implementation, the battery cell 8 may also be a battery cell 8 including a main grid.

[0042] Two adjacent battery cells 8 in each battery string are connected in series by a welding ribbon to form a battery string. The welding ribbon can be a silver welding ribbon or a black welding ribbon, including a low-temperature welding ribbon, a conventional welding ribbon, and welding ribbons with different composition ratios.

[0043] The black solder strip is a solder strip with a black conductive layer coated on the surface. The use of the black solder strip in the all-black double-glass photovoltaic module of this embodiment can further ensure the all-black effect of the photovoltaic module.

[0044] The bus bar 4 may be a conventional silver tin-copper bus bar 4 . Since the black shielding bar 3 is located on the surface of the bus bar 4 facing the front glass substrate 1 , the color of the bus bar 4 may not be black.

[0045] The function of the black shielding strip 3 is to shield the bus bar 4. The width of the black shielding strip 3 can be equal to the width of the bus bar 4 or slightly larger than the width of the bus bar 4 to ensure the shielding effect on the bus bar 4 and achieve a full black effect of the photovoltaic module.

[0046] The width of the black shielding strip 3 may be in the range of 4 mm to 8 mm, and the thickness may be in the range of 0.1 mm to 1 mm.

[0047] The black shielding strip 3 and the bus bar 4 can be connected by welding or bonding.

[0048] The front glass substrate 1 may be a tempered glass substrate to enhance the mechanical properties and impact resistance of the all-black double-glass photovoltaic module, thereby extending the service life of the all-black double-glass photovoltaic module.

[0049] The front glass substrate 1 may be a colorless glass substrate, or may be a transmittance glass that matches the reflection range of the nitride layer located on the front side of the cell 8 .

[0050] The color of the film gasket 7 can be transparent. The film gasket 7 is arranged around the all-black double-glass photovoltaic module. There is no battery cell 8 in the area where the film gasket 7 is located, and the thickness of the film gasket 7 is greater than the thickness of the front encapsulation layer 2 and the back encapsulation layer 5. The function is to increase the amount of film used around the all-black double-glass photovoltaic module.

[0051] It should be noted that the present application does not limit the thickness of the adhesive film gasket 7. For example, the thickness of the adhesive film gasket 7 can be less than, greater than, or equal to a target thickness, where the target thickness is the thickness of the back encapsulation layer 5 and the thickness of the front encapsulation layer 2.

[0052] When the thickness of the film gasket 7 is equal to the thickness of the back encapsulation layer 5 and the thickness of the front encapsulation layer 2, it can improve the problem of bubbles in the all-black double-glass photovoltaic module due to the low weight of the film and facilitate simple material unification.

[0053] When the thickness of the film gasket 7 is greater than the thickness of the back encapsulation layer 5 and the thickness of the front encapsulation layer 2, the risk of bubbles appearing in the all-black double-glass photovoltaic module is lower and the thickness of the module edge is more uniform.

[0054] As an implementation method, when the thickness of the adhesive film gasket is greater than the target thickness, the thickness of the adhesive film gasket 7 increases in the direction away from the cell layer, that is, the closer the adhesive film gasket 7 is to the edge of the all-black double-glass photovoltaic module, the thicker the thickness. However, the present application does not limit this, and the adhesive film gasket 7 can also be a gasket of equal thickness, that is, the thickness of the adhesive film gasket 7 is uniform everywhere.

[0055] In this embodiment, the type of the adhesive film gasket 7 is not limited and can be selected by the user. For example, the adhesive film gasket 7 can be a POE gasket or an EVA gasket.

[0056] It should be noted that the connection relationship between the first adhesive film gasket 7 and the back encapsulation layer 5 and the front encapsulation layer 2 in the present application is not limited and can be set as required. Two different connection relationships are introduced below.

[0057] As an implementation method, the adhesive film gasket 7 is an integrated structure with the back encapsulation layer 5 and the front encapsulation layer 2. That is, the adhesive film gasket 7 is connected with the back encapsulation layer 5 and the front encapsulation layer 2. At this time, the integrated structure of the back encapsulation layer 5 and the adhesive film gasket 7 presents a structure that is thin in the middle and thick around the edges; the integrated structure of the front encapsulation layer 2 and the adhesive film gasket 7 presents a structure that is thin in the middle and thick around the edges.

[0058] As another possible implementation method, the adhesive film gasket 7 is a separate structure from the back encapsulation layer 5 and the front encapsulation layer 2. That is, the adhesive film gasket 7 is independent, and there is no connection between the adhesive film gasket 7 and the back encapsulation layer 5 and the front encapsulation layer 2. At this time, the adhesive film gasket 7 is laid around the all-black double-glass photovoltaic module by mechanical placement.

[0059] The all-black double-glass photovoltaic module in this embodiment is provided with a black shielding strip 3 on the surface of the bus bar 4 facing the front glass substrate 1, and the bus bar 4 does not need to be coated with black pigment, thereby avoiding problems such as paint peeling, whitening, and contamination of the photovoltaic module when the bus bar 4 is bent, while ensuring the color uniformity of the photovoltaic module. In addition, in the all-black double-glass photovoltaic module of this application, a film gasket 7 is also provided around the all-black double-glass photovoltaic module, which can increase the weight of the film in the all-black double-glass photovoltaic module, thereby improving the problem of bubbles in the all-black double-glass photovoltaic module due to the low gram weight of the film.

[0060] Based on the above embodiments, in one embodiment of the present application, the all-black double-glass photovoltaic module includes:

[0061] Adhesive film gasket 7, back glass substrate 6, back encapsulation layer 5, battery layer, front encapsulation layer 2 and front glass substrate 1 stacked in sequence;

[0062] The battery layer includes a welding strip, a plurality of battery strings, a bus bar 4 connecting the plurality of battery strings, and a black shielding strip 3, wherein the black shielding strip 3 is located on the surface of the bus bar 4 facing the front glass substrate 1;

[0063] The adhesive film gasket 7 is located between the front glass substrate 1 and the back glass substrate 6 , and the adhesive film gasket 7 is located within the plane where the battery layer is located, and is distributed around the four edges of the battery layer.

[0064] The black shielding strip 3 includes an adhesive layer 33, a support layer 32 and a black coating layer 31 stacked in sequence from bottom to top. Figure 4 shown.

[0065] The material of the adhesive layer 33 can be a film or other material with greater friction. The adhesive layer 33 contacts the bus bar 4 to prevent the black shielding strip 3 and the bus bar 4 from slipping during lamination, exposing the bus bar 4 and preventing the photovoltaic module from achieving a completely black effect.

[0066] The support layer 32 provides mechanical strength for the black shielding strip 3 , and the material of the support layer 32 may be PET (Polyethylene terephthalate) or the like.

[0067] The black coating 31 includes but is not limited to a black insulating organic coating or a black pigment layer. The thickness of the black coating 31 may range from 0.01 mm to 0.1 mm.

[0068] Please refer to Figure 5 Based on any of the above embodiments, in one embodiment of the present application, the all-black double-glass photovoltaic module may further include:

[0069] A flexible insulating layer 9 is provided between the bus bar 4 and the black shielding bar 3 .

[0070] The flexible insulating layer 9 includes but is not limited to a POE film layer or an EVA film layer.

[0071] The width of the flexible insulating layer 9 may be slightly wider than the black shielding strip 3 , so as to ensure the insulation between the bus bar 4 and the black shielding strip 3 and to provide a buffering effect.

[0072] The following two cases are used as examples to introduce the sample preparation of the all-black double-glass photovoltaic module in this application.

[0073] Example 1: The cell is a TOPCon cell, without a busbar design

[0074] Sample preparation order: battery string welding, front glass substrate laying, front encapsulation layer laying, battery string placement, grabbing and welding, black shielding strip placement, battery string placement after welding, back encapsulation layer laying, back glass substrate laying; welding ribbon diameter range is 0.18mm~0.26mm; black coating thickness range is 0.01~0.1mm; black shielding strip width is 4~8mm, thickness is 0.1~1mm, flexible insulation layer film weight is 200g~500g.

[0075] Example 2: The cell is a TOPCon cell, without a busbar design

[0076] Sample preparation order: battery string welding, front glass substrate laying, front encapsulation layer laying, battery string placement, grabbing and welding, black shielding strip placement, flexible insulation layer laying, battery string placement after welding, back encapsulation layer laying, back glass substrate laying; welding ribbon diameter range is 0.18mm~0.26mm; black coating thickness range is 0.01~0.1mm; black shielding strip width is 4~8mm, thickness is 0.1~1mm, flexible insulation layer film weight is 200g~500g.

[0077] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0078] The above is a detailed introduction to the all-black double-glass photovoltaic module provided by the present application. This article uses specific examples 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 and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A fully black double-glass photovoltaic module, characterized in that: include: Adhesive film gasket, back glass substrate, back encapsulation layer, battery cell layer, front encapsulation layer and front glass substrate stacked in sequence; The battery sheet layer includes a welding strip, a plurality of battery strings, a bus bar connecting the plurality of battery strings, and a black shielding bar, wherein the black shielding bar is located on a surface of the bus bar facing the front glass substrate; The adhesive film gasket is located between the front glass substrate and the back glass substrate, and the adhesive film gasket is located within the plane where the battery layer is located, and is distributed around the four edges of the battery layer.

2. The all-black double-glass photovoltaic module according to claim 1, characterized in that: The adhesive film gasket, the back side packaging layer and the front side packaging layer are an integrated structure.

3. The all-black double-glass photovoltaic module according to claim 1, characterized in that: The adhesive film gasket, the back side packaging layer and the front side packaging layer are separated structures.

4. The all-black double-glass photovoltaic module according to claim 1, characterized in that: The thickness of the adhesive film gasket is greater than or equal to a target thickness, and the target thickness is the thickness of the back encapsulation layer and the thickness of the front encapsulation layer.

5. The all-black double-glass photovoltaic module according to claim 4, characterized in that: When the thickness of the adhesive film gasket is greater than the target thickness, the thickness of the adhesive film gasket increases sequentially in a direction away from the battery sheet layer.

6. The all-black double-glass photovoltaic module according to claim 1, characterized in that: The black shielding strip comprises an adhesive layer, a supporting layer and a black coating layer which are stacked in sequence from bottom to top.

7. The all-black double-glass photovoltaic module according to claim 6, characterized in that: The black coating includes a black insulating organic coating or a black pigment layer.

8. The all-black double-glass photovoltaic module according to claim 1, characterized in that: The black shielding strip is connected to the bus bar by welding or bonding.

9. The all-black double-glass photovoltaic module according to claim 1, characterized in that: The battery string includes a plurality of battery cells, and the battery cells are busbar-free battery cells.

10. The all-black double-glass photovoltaic module according to claim 1, characterized in that: The back side encapsulation layer is a black encapsulation layer or a transparent encapsulation layer.

11. The all-black double-glass photovoltaic module according to any one of claims 1 to 10, characterized in that: Also includes: A flexible insulating layer is provided between the bus bar and the black shielding strip.

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