Photovoltaic module

Abstract

The utility model discloses a photovoltaic module, and relates to the field of photovoltaic technology, the photovoltaic module comprises a battery layer and a first packaging adhesive film layer which are sequentially stacked from bottom to top, the battery layer comprises a plurality of solar cells which are electrically connected, and the first surfaces of the solar cells face the first packaging adhesive film layer; on the first surface, the solar cell piece comprises a first grid line extending in the first direction, and the first grid line is provided with a plurality of first welding spots distributed at intervals; the first welding strip is positioned between the first packaging adhesive film layer and the first surface of the solar cell and is welded on the first grid line through a first welding spot; the photovoltaic module further comprises a first anti-oxidation coating located on the side, away from the first face, of the first welding strip, and the projection of the first anti-oxidation coating on the first face at least covers the projection of the first welding spot on the first face. According to the invention, the oxidation and erosion effects of water vapor on the photovoltaic module can be reduced as much as possible, and the oxidation resistance of the photovoltaic module is improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and more specifically, to a photovoltaic module. Background Art

[0002] Photovoltaic modules are mainly composed of solar cells, back panels, glass, encapsulation films, junction boxes, frames, etc. They can convert solar energy into electrical energy. They have the advantages of efficient use of solar energy, environmental protection and pollution-free, and low maintenance costs, and are widely used in many fields.

[0003] However, due to the complex operating environment, during actual use, photovoltaic modules may be affected by factors such as oxygen, temperature, light, relative humidity, and external impact, resulting in a decrease in the life and performance of photovoltaic modules, or even failure of photovoltaic modules. For example, as the bonding material between the glass, solar cells and cover plates in photovoltaic modules, the encapsulation film mainly protects the solar cells from oxidation and water vapor intrusion. However, during actual use, since the soldering tape welded on the surface of the solar cell has a certain thickness, some of the soldering tapes may directly penetrate the film after lamination, causing water vapor to continuously enter from the punctured position of the film, and then diffuse to the entire solar cell, causing oxidation and corrosion to the solar cell, electrical connectors, etc., resulting in a significant attenuation of the performance of the photovoltaic module, and in severe cases, it will lead to its failure. Utility Model Content

[0004] In view of this, the present application provides a photovoltaic module for minimizing the oxidation and corrosion effects of water vapor on the photovoltaic module and improving the oxidation resistance of the photovoltaic module.

[0005] In a first aspect, the present application provides a photovoltaic module, the photovoltaic module comprising a battery layer and a first encapsulation film layer stacked in sequence from bottom to top, the battery layer comprising a plurality of electrically connected solar cells, the photovoltaic module further comprising a welding ribbon, and two adjacent solar cells are electrically connected through the welding ribbon;

[0006] The solar cell has a first surface and a second surface opposite to each other, the first surface of the solar cell faces the first encapsulation film layer; on the first surface, the solar cell comprises a first grid line extending along a first direction, and the first grid line has a plurality of first welding points distributed at intervals;

[0007] The welding strip includes a first welding strip extending along a first direction, the first welding strip is located between the first packaging film layer and the first surface of the solar cell sheet, and the first welding strip is welded to the first grid line through a first welding point;

[0008] The photovoltaic assembly further includes a first anti-oxidation coating located on a side of the first welding strip away from the first surface, and a projection of the first anti-oxidation coating on the first surface at least covers a projection of the first welding point on the first surface.

[0009] Optionally, where:

[0010] The projection of the first anti-oxidation coating on the first surface covers the projection of the first grid line on the first surface.

[0011] Optionally, where:

[0012] Along the second direction, the projection width of the first anti-oxidation coating on the first surface at least covers the projection width of the first grid line on the first surface. The second direction is perpendicular to the first direction, and the plane formed by the first direction and the second direction is parallel to the first surface.

[0013] Optionally, where:

[0014] Along the first direction, a projection length of the first anti-oxidation coating on the first surface at least covers a projection length of the first grid line on the first surface.

[0015] Optionally, where:

[0016] In the third direction, the first anti-oxidation coating has a thickness D1, 0<D1≤5μm; the third direction is perpendicular to the first surface.

[0017] Optionally, where:

[0018] The photovoltaic module further includes a second encapsulation film layer located on a side of the battery layer away from the first encapsulation film layer, and the second side of the solar cell sheet faces the second encapsulation film layer;

[0019] On the second surface, the solar cell sheet includes a second grid line extending along the first direction, and the second grid line has a plurality of second welding points distributed at intervals;

[0020] The welding strip also includes a second welding strip extending along the first direction, the second welding strip is located between the second packaging film layer and the second surface of the solar cell sheet, and the second welding strip is welded to the second grid line through a second welding point;

[0021] The photovoltaic assembly also includes a second anti-oxidation coating located on a side of the second welding strip away from the second surface, and a projection of the second anti-oxidation coating on the second surface covers a projection of the second welding point on the second surface.

[0022] Optionally, where:

[0023] The projection of the second anti-oxidation coating on the second surface covers the projection of the second grid line on the second surface.

[0024] Optionally, where:

[0025] Along the second direction, the projection width of the second anti-oxidation coating on the second surface at least covers the projection width of the second grid line on the second surface. The second direction is perpendicular to the first direction, and the plane formed by the first direction and the second direction is parallel to the second surface.

[0026] Optionally, where:

[0027] Along the first direction, the projection length of the second anti-oxidation coating on the second surface at least covers the projection length of the second grid line on the second surface.

[0028] Optionally, where:

[0029] In the third direction, the second anti-oxidation coating has a thickness D2, 0<D2≤5μm; the third direction is perpendicular to the second surface.

[0030] Compared with the prior art, the photovoltaic module provided by the present application achieves at least the following beneficial effects:

[0031] In the actual production process, since the surface of the solar cell needs to be welded with welding ribbons, and the welding ribbons themselves have a certain thickness, after lamination, the individual first welding ribbons welded on the first surface of the solar cell may directly penetrate the first packaging film layer, causing water vapor to enter continuously. And compared with other positions, the risk of puncturing the film at the first welding point is greater. Based on this, the present application applies a first anti-oxidation coating on the side of the first welding ribbon away from the first surface, and the first anti-oxidation coating at least covers the surface of the first welding point to ensure that the first welding point is not exposed outside the first anti-oxidation coating, and reduces the oxidation and erosion of the first welding point by water vapor as much as possible, thereby reducing the oxidation and erosion of the entire photovoltaic module by water vapor, and improving the oxidation resistance of the photovoltaic module; at the same time, the first anti-oxidation coating is only coated on the side of the first welding ribbon away from the first surface of the solar cell, and will not affect the welding performance of the first welding ribbon.

[0032] Of course, any product implementing this application does not necessarily need to achieve all of the technical effects described above at the same time.

[0033] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0035] Figure 1 Shown is a schematic diagram of a side structure of a photovoltaic module provided in an embodiment of the present application;

[0036] Figure 2 The figure shows a connection diagram between the first surface of the solar cell provided in the embodiment of the present application and the first welding strip or a connection diagram between the second surface and the second welding strip;

[0037] Figure 3Shown is a perspective schematic diagram of a first surface of a solar cell coated with a first anti-oxidation coating or a perspective schematic diagram of a second surface of a solar cell coated with a second anti-oxidation coating provided in an embodiment of the present application;

[0038] Figure 4 Shown Figure 1 A partial enlarged view of

[0039] Figure 5 Another schematic diagram of the side structure of a photovoltaic module provided in an embodiment of the present application is shown;

[0040] Figure 6 Shown Figure 5 A partial enlarged view of . DETAILED DESCRIPTION

[0041] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0042] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0043] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0044] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0045] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0046] With the continuous consumption of traditional energy and its increasingly serious negative impact on the environment, the development and utilization of solar energy as a pollution-free renewable energy has attracted widespread attention from all countries and has developed rapidly.

[0047] Photovoltaic modules are mainly composed of solar cells, back panels, glass, packaging films, junction boxes, frames, etc. They can convert solar energy into electrical energy. They have the advantages of efficient use of solar energy, environmental protection and pollution-free, and low maintenance costs. They have been widely used in many fields.

[0048] However, due to the complex operating environment, during actual use, photovoltaic modules may be affected by factors such as oxygen, temperature, light, relative humidity, and external impact, resulting in a decrease in the life and performance of photovoltaic modules, or even failure of photovoltaic modules. For example, as the bonding material between the glass, solar cells and cover plates in photovoltaic modules, the encapsulation film mainly protects the solar cells from oxidation and water vapor intrusion. However, during actual use, since the soldering tape welded on the surface of the solar cell has a certain thickness, some of the soldering tapes may directly penetrate the film after lamination, causing water vapor to continuously enter from the punctured position of the film, and then diffuse to the entire solar cell, causing oxidation and corrosion to the solar cell, electrical connectors, etc., resulting in a significant attenuation of the performance of the photovoltaic module, and in severe cases, it will lead to its failure.

[0049] In order to solve the above technical problems, the present application proposes a photovoltaic module, which is used to reduce the oxidation and corrosion effects of water vapor on the photovoltaic module as much as possible and improve the oxidation resistance of the photovoltaic module.

[0050] The following is a detailed description with reference to the accompanying drawings and specific embodiments.

[0051] Figure 1 Shown is a schematic diagram of a side structure of a photovoltaic module provided in an embodiment of the present application; Figure 2 The figure shows a connection diagram between the first surface of the solar cell provided in the embodiment of the present application and the first welding strip or a connection diagram between the second surface and the second welding strip; Figure 3 The diagram shows a perspective view of the first side of a solar cell coated with a first anti-oxidation coating or a perspective view of the second side of a solar cell coated with a second anti-oxidation coating provided in the embodiments of the present application. It should be noted that all the drawings provided in the embodiments of the present application are simplified schematic diagrams and do not represent actual sizes and proportions.

[0052] like Figure 1 to Figure 3 As shown, an embodiment of the present application provides a photovoltaic module, the photovoltaic module includes a battery layer 20 and a first encapsulation film layer 10 stacked in sequence from bottom to top, the battery layer 20 includes a plurality of electrically connected solar cells 21, and the photovoltaic module also includes a welding ribbon, and two adjacent solar cells 21 are electrically connected through the welding ribbon;

[0053] The solar cell 21 has a first surface and a second surface opposite to each other, and the first surface of the solar cell 21 faces the first encapsulation film layer 10; on the first surface, the solar cell 21 includes a first grid line 211 extending along a first direction, and the first grid line 211 has a plurality of first welding points 212 distributed at intervals;

[0054] The welding strip includes a first welding strip 22 extending along a first direction, the first welding strip 22 is located between the first encapsulation film layer 10 and the first surface of the solar cell 21, and the first welding strip 22 is welded to the first grid line 211 through a first welding point 212;

[0055] The photovoltaic module further includes a first anti-oxidation coating 30 located on a side of the first welding strip 22 away from the first surface, and a projection of the first anti-oxidation coating 30 on the first surface at least covers a projection of the first welding point 212 on the first surface.

[0056] When implementing it, Figure 1 to Figure 3 As shown, the first welding strip 22 is first welded to the first grid line 211 , and after welding, the first anti-oxidation coating 30 is coated on the side of the first welding strip 22 away from the first surface of the solar cell 21 , and the first anti-oxidation coating 30 needs to at least cover the first welding point 212 .

[0057] Through the composition structure and specific implementation process of the above photovoltaic modules, it can be seen that Figure 1 to Figure 3 As shown, in the photovoltaic module, the first encapsulation film layer 10 can cover the battery layer 20 from the position where the first side of the solar cell 21 is located, so as to protect the battery layer 20, prevent water vapor from entering and the solar cell 21 from being oxidized. However, in the actual production process, since the surface of the solar cell 21 needs to be welded with a welding strip to achieve the function of connecting two adjacent solar cells 21, and the welding strip itself has a certain thickness, after lamination, the individual first welding strips 22 welded on the first side of the solar cell 21 may directly penetrate the first encapsulation film layer 10, causing water vapor to enter continuously. The first side of the solar cell 21 also has a first grid line 211, and the first welding strip 22 is welded to the first grid line 211 through the first welding point 212, thereby achieving the function of collecting and transmitting carriers. Therefore, compared with other positions, the risk of puncturing the film at the first welding point 212 is greater. Based on this, in the embodiment of the present application, a first anti-oxidation coating 30 is coated on the side of the first welding strip 22 away from the first surface, and the coated first anti-oxidation coating 30 at least covers the surface of the first welding point 212, ensuring that the first welding point 212 is not exposed outside the first anti-oxidation coating 30, so that when the first welding point 212 pierces the first packaging film layer 10 after lamination, the first anti-oxidation coating 30 is exposed first, thereby reducing the oxidation and erosion of the first welding point 212 by water vapor as much as possible, thereby reducing the oxidation and erosion of the entire photovoltaic module by water vapor, and improving the oxidation resistance of the photovoltaic module; at the same time, the first anti-oxidation coating 30 is only coated on the side of the first welding strip 22 away from the first surface of the solar cell 21, and will not affect the welding performance of the first welding strip 22 and the bonding force between the first welding strip 22 and the first grid line 211.

[0058] In some examples, the solar cells provided in the embodiments of the present application can be any type of solar cells currently available, including but not limited to crystalline silicon cells, perovskite cells, dye-sensitized solar cells, quantum dot-sensitized solar cells, organic solar cells, stacked solar cells, etc., among which crystalline silicon cells include but are not limited to PERC cells, TopCon cells, HJT cells, IBC cells, etc., which are only used as examples here and are not specifically limited.

[0059] The first direction is Figure 2 and Figure 3 As shown in direction A in .

[0060] As a possible implementation, Figure 1 to Figure 3 As shown, the projection of the first anti-oxidation coating 30 on the first surface covers the projection of the first gate line 211 on the first surface.

[0061] like Figure 1 to Figure 3 As shown, in an actual environment, the first water vapor that invades may spread around the punctured point of the first packaging film layer 10 to the entire first grid line 211, causing the first grid line 211 to be oxidized and fail by the water vapor, affecting the collection and transmission of carriers, thereby affecting the photoelectric conversion efficiency of the solar cell 21. Therefore, when applying the first anti-oxidation coating 30, the first anti-oxidation coating 30 can cover the entire first grid line 211 to reduce the oxidation and erosion of the entire first grid line 211 by water vapor as much as possible, thereby further reducing the oxidation and erosion of the entire photovoltaic module by water vapor, and further improving the oxidation resistance of the photovoltaic module.

[0062] In some examples, such as Figure 1 to Figure 3 As shown, along the second direction, the projection width of the first anti-oxidation coating 30 on the first surface at least covers the projection width of the first gate line 211 on the first surface, the second direction is perpendicular to the first direction, and the plane formed by the first direction and the second direction is parallel to the first surface.

[0063] like Figure 1 to Figure 3 As shown, in order to minimize the oxidation and failure of the first grid line 211 caused by the intrusion of water vapor, when applying the first anti-oxidation coating 30, the first anti-oxidation coating 30 can be made to at least completely cover the first grid line 211 in the second direction, thereby preventing water vapor from intruding from all sides of the first grid line 211 as much as possible, thereby improving the oxidation resistance of the first grid line 211 and reducing the further spread of water vapor, thereby further reducing the oxidation and corrosion effects of water vapor on the entire photovoltaic module, and further improving the oxidation resistance of the photovoltaic module.

[0064] Furthermore, since the first welding strip is generally welded to the first grid line on the first surface of the solar cell, and after the first welding strip is welded, the width of the first welding strip in the second direction is generally greater than or equal to the width of the first grid line, when the first anti-oxidation coating is actually applied, the width of the first welding strip in the second direction can be used as a basis, so that the applied first anti-oxidation coating can completely cover the first welding strip in the second direction, so as to achieve the purpose of the first anti-oxidation coating completely covering the first grid line in the second direction, and minimize the intrusion of water vapor from all sides of the first welding strip, causing the first grid line to be oxidized and corroded by water vapor. If the first welding strip is offset during welding, causing the first welding strip to partially cover the first gate line in the second direction, the first anti-oxidation coating can be applied based on the combination of the width of the first welding strip and the exposed portion of the first gate line in the second direction; if the first welding strip is offset too much, causing part of the first welding strip to be completely exposed, the first anti-oxidation coating can be directly applied based on the width of the first gate line in the second direction as a reference, ultimately achieving the purpose of the applied first anti-oxidation coating completely covering the first gate line in the second direction, thereby minimizing the infiltration of water vapor from all sides of the first gate line to oxidize or corrode the first gate line.

[0065] The second direction is Figure 2 and Figure 3 As shown in direction B.

[0066] In some examples, such as Figure 1 to Figure 3 As shown, along the first direction, the projection length of the first anti-oxidation coating 30 on the first surface at least covers the projection length of the first gate line 211 on the first surface.

[0067] like Figure 1 to Figure 3 As shown, in order to minimize the oxidation and failure of the first grid line 211 caused by the intrusion of water vapor, when applying the first anti-oxidation coating 30, the first anti-oxidation coating 30 can be made to at least completely cover the first grid line 211 in the first direction, thereby preventing water vapor from intruding from all sides of the first grid line 211 as much as possible, thereby improving the oxidation resistance of the first grid line 211 and reducing the further spread of water vapor, thereby further reducing the oxidation and corrosion effects of water vapor on the entire photovoltaic module, and further improving the oxidation resistance of the photovoltaic module.

[0068] Furthermore, when viewed along the first direction, the projection of the first welding strip on the first surface of the solar cell may not completely cover the projection of the first grid line on the first surface of the solar cell. For example, part of the first welding strip may not be welded from the end of the first grid line when welding. Therefore, the coating length of the first anti-oxidation coating in the first direction is still based on the length of the first grid line in the first direction. If the first welding strip welded on the first surface of the solar cell can completely cover the first grid line in the first direction, it is difficult to determine the specific length of the covered first grid line. When applying the first anti-oxidation coating, the first welding strip can be completely covered in the first direction to minimize the intrusion of water vapor from all sides of the first welding strip, causing the first grid line to be oxidized and corroded by water vapor.

[0069] Figure 4 Shown Figure 1 A partial enlarged view of .

[0070] As a possible implementation, Figure 4 As shown, in the third direction, the first anti-oxidation coating 30 has a thickness D1, 0<D1≤5μm; the third direction is perpendicular to the first surface.

[0071] Based on this, Figure 4 As shown, the first anti-oxidation coating 30 with a thickness range of 0 to 5 μm can play a sufficient role in resisting water vapor erosion and anti-oxidation, further reducing the oxidation and erosion of the first grid line 211 by water vapor, improving the anti-oxidation property of the first grid line 211, thereby further reducing the oxidation and erosion of the entire photovoltaic module by water vapor, and further improving the anti-oxidation property of the photovoltaic module. In addition, compared with the conventional thickness of the first welding strip 22, the first anti-oxidation coating 30 is at most 5 μm thick, and the effect on the thickness of the photovoltaic module can be ignored. If the thickness of the first anti-oxidation coating 30 is too thick, it is easy to cause hidden cracks in the solar cell 21 during lamination.

[0072] In some examples, in the third direction, the thickness D1 of the first anti-oxidation coating can be any range or any value between 0 and 5 μm; illustratively, in the third direction, the value range of the thickness D1 of the first anti-oxidation coating can be 0<D1≤4.5μm, 0.5μm<D1≤5μm or 1μm<D1≤4μm, etc.; for example, in the third direction, the thickness D1 of the first anti-oxidation coating can be 0.05μm, 0.5μm, 1μm, 2μm, 3μm, 4μm, 4.5μm or 5μm, etc., which are only examples here and are not specifically limited.

[0073] Figure 5 Shown is another side structural schematic diagram of a photovoltaic module provided in an embodiment of the present application.

[0074] As a possible implementation, Figure 2-Figure 3 and Figure 5 As shown, the photovoltaic module further includes a second encapsulation film layer 40 located on the side of the cell layer 20 away from the first encapsulation film layer 10, and the second surface of the solar cell 21 faces the second encapsulation film layer 40;

[0075] On the second surface, the solar cell 21 includes a second grid line 213 extending along the first direction, and the second grid line 213 has a plurality of second welding points 214 distributed at intervals;

[0076] The welding strip also includes a second welding strip 23 extending along the first direction, the second welding strip 23 is located between the second encapsulation film layer 40 and the second surface of the solar cell 21, and the second welding strip 23 is welded to the second grid line 213 through a second welding point 214;

[0077] The photovoltaic module further includes a second anti-oxidation coating 31 located on the side of the second welding strip 23 away from the second surface, and the projection of the second anti-oxidation coating 31 on the second surface covers the projection of the second welding point 214 on the second surface.

[0078] Based on this, Figure 2-Figure 3 and Figure 5As shown, in the photovoltaic module, the second encapsulation film layer 40 can be covered on the battery layer 20 from the position where the second side of the solar cell 21 is located, so as to protect the battery layer 20, prevent water vapor from entering and the solar cell 21 from being oxidized. In the actual production process, the second side of the solar cell 21 needs to be welded with a second welding strip 23 to achieve the effect of connecting two adjacent solar cells 21. The second welding strip 23 itself has a certain thickness. After lamination, the individual second welding strips 23 welded on the second side of the solar cell 21 may directly penetrate the second encapsulation film layer 40, causing water vapor to enter continuously. The second side of the solar cell 21 also has a second grid line 213, and the second welding strip 23 is welded to the second grid line 213 through a second welding point 214, thereby realizing the collection and transmission of carriers. Therefore, compared with other positions, the risk of piercing the second encapsulation film layer 40 at the second welding point 214 is greater. Based on this, in the embodiment of the present application, a second anti-oxidation coating 31 is coated on the side of the second welding strip 23 away from the second surface, and the coated second anti-oxidation coating 31 at least covers the surface of the second welding point 214, ensuring that the second welding point 214 is not exposed outside the second anti-oxidation coating 31, so that when the second welding point 214 pierces the second packaging film layer 40 after lamination, the second anti-oxidation coating 31 is exposed first, thereby reducing the oxidation and erosion of the second welding point 214 by water vapor as much as possible, thereby reducing the oxidation and erosion of the entire photovoltaic module by water vapor, and improving the oxidation resistance of the photovoltaic module; at the same time, the second anti-oxidation coating 31 is only coated on the side of the second welding strip 23 away from the second surface of the solar cell 21, and will not affect the welding performance of the second welding strip 23, and the bonding force between the second welding strip 23 and the second grid line 213.

[0079] In some examples, such as Figure 2-Figure 3 and Figure 5 As shown, the projection of the second anti-oxidation coating 31 on the second surface covers the projection of the second gate line 213 on the second surface.

[0080] like Figure 2-Figure 3 and Figure 5 As shown, in an actual environment, the water vapor that first invades may spread around the punctured point of the second packaging film layer 40 to the entire second grid line 213, causing the second grid line 213 to be oxidized and fail by the water vapor, affecting the collection and transmission of carriers, thereby affecting the photoelectric conversion efficiency of the solar cell 21. Therefore, when applying the second anti-oxidation coating 31, the second anti-oxidation coating 31 can cover the entire second grid line 213 to reduce the oxidation and erosion of the entire second grid line 213 by water vapor as much as possible, thereby further reducing the oxidation and erosion of the entire photovoltaic module by water vapor, and further improving the oxidation resistance of the photovoltaic module.

[0081] In some examples, such as Figure 2-Figure 3 and Figure 5 As shown, along the second direction, the projection width of the second anti-oxidation coating 31 on the second surface at least covers the projection width of the second gate line 213 on the second surface, the second direction is perpendicular to the first direction, and the plane formed by the first direction and the second direction is parallel to the second surface.

[0082] like Figure 2-Figure 3 and Figure 5 As shown, in order to minimize the oxidation and failure of the second grid line 213 caused by the intrusion of water vapor, when applying the second anti-oxidation coating 31, the second anti-oxidation coating 31 can be made to at least completely cover the second grid line 213 in the second direction, thereby preventing water vapor from intruding from all sides of the second grid line 213 as much as possible, thereby improving the oxidation resistance of the second grid line 213 and reducing the further spread of water vapor, thereby further reducing the oxidation and corrosion effects of water vapor on the entire photovoltaic module, and further improving the oxidation resistance of the photovoltaic module.

[0083] Furthermore, since the second welding strip is generally welded to the second grid line on the second surface of the solar cell, and after the second welding strip is welded, the width of the second welding strip in the second direction is generally greater than or equal to the width of the second grid line, when the second anti-oxidation coating is actually applied, the width of the second welding strip in the second direction can be used as a basis, so that the applied second anti-oxidation coating can completely cover the second welding strip in the second direction, so as to achieve the purpose of the second anti-oxidation coating completely covering the second grid line in the second direction, and minimize the intrusion of water vapor from all sides of the second welding strip, causing the second grid line to be oxidized and corroded by water vapor. If the second welding strip is offset during welding, causing the second welding strip to partially cover the second grid line in the second direction, the second anti-oxidation coating can be applied based on the combination of the width of the second welding strip and the exposed portion of the second grid line in the second direction; if the second welding strip is offset too much, causing part of the second welding strip to be completely exposed, the second anti-oxidation coating can be directly applied based on the width of the second grid line in the second direction as a reference, ultimately achieving the purpose of the applied second anti-oxidation coating completely covering the second grid line in the second direction, thereby minimizing the infiltration of water vapor from all sides of the second grid line to oxidize or corrode the second grid line.

[0084] In some examples, such as Figure 2-Figure 3 and Figure 5 As shown, along the first direction, the projection length of the second anti-oxidation coating 31 on the second surface at least covers the projection length of the second gate line 213 on the second surface.

[0085] like Figure 2-Figure 3 and Figure 5As shown, in order to minimize the oxidation and failure of the second grid line 213 caused by the intrusion of water vapor, when the second anti-oxidation coating 31 is applied, the second anti-oxidation coating 31 can be made to at least completely cover the second grid line 213 in the first direction, thereby preventing water vapor from intruding from all sides of the second grid line 213 as much as possible, thereby improving the oxidation resistance of the second grid line 213 and reducing the further spread of water vapor, thereby further reducing the oxidation and corrosion effects of water vapor on the entire photovoltaic module, and further improving the oxidation resistance of the photovoltaic module.

[0086] Furthermore, when viewed along the first direction, the projection of the second welding strip on the second surface of the solar cell may not completely cover the projection of the second grid line on the second surface of the solar cell. For example, when welding, part of the second welding strip may not be welded from the end of the second grid line. Therefore, the coating length of the second anti-oxidation coating in the first direction is still based on the length of the second grid line in the first direction. If the second welding strip welded on the second surface of the solar cell can completely cover the second grid line in the first direction, it is difficult to determine the specific length of the covered second grid line. When applying the second anti-oxidation coating, the second welding strip can be completely covered in the first direction to minimize the intrusion of water vapor from all sides of the second welding strip, causing the second grid line to be oxidized and corroded by water vapor.

[0087] Figure 6 Shown Figure 5 A partial enlarged view of .

[0088] In some examples, such as Figure 6 As shown, in the third direction, the second anti-oxidation coating 31 has a thickness D2, 0<D2≤5μm; the third direction is perpendicular to the second surface.

[0089] Based on this, Figure 6 As shown, the second anti-oxidation coating 31 with a thickness range of 0 to 5 μm can play a sufficient role in resisting water vapor erosion and anti-oxidation, further reducing the oxidation and erosion of the second grid line 213 by water vapor, improving the anti-oxidation property of the second grid line 213, thereby further reducing the oxidation and erosion of the entire photovoltaic module by water vapor, and further improving the anti-oxidation property of the photovoltaic module. In addition, compared with the conventional thickness of the second welding strip 23, the second anti-oxidation coating 31 is at most 5 μm thick, and the effect on the thickness of the photovoltaic module can be ignored. If the thickness of the second anti-oxidation coating 31 is too thick, it is easy to cause hidden cracks in the solar cell 21 during lamination.

[0090] In some examples, in the third direction, the thickness D2 of the second anti-oxidation coating can be any range or value between 0 and 5 μm; illustratively, in the third direction, the value range of the thickness D2 of the second anti-oxidation coating can be 0<D2≤4.5μm, 0.5μm<D2≤5μm or 1μm<D2≤4μm, etc.; for example, in the third direction, the thickness D2 of the second anti-oxidation coating can be 0.05μm, 0.5μm, 1μm, 2μm, 3μm, 4μm, 4.5μm or 5μm, etc., which are only examples here and are not specifically limited.

[0091] In some examples, the first side of the solar cell may be the light-receiving side and the second side may be the backlight side, or the first side of the solar cell may be the backlight side and the second side may be the light-receiving side. This is only an example and is not specifically limited.

[0092] In some examples, such as Figure 2 and Figure 3 As shown, the first grid lines 211 on the first surface of the solar cell 21 may be main grid lines on the first surface, and the second grid lines 213 on the second surface of the solar cell 21 may be main grid lines on the second surface.

[0093] Exemplarily, the first anti-oxidation coating can be selected from any one or more combinations of existing anti-oxidation materials. For example, the first anti-oxidation coating is an anti-oxidation material such as fluorocarbon coating or graphite, or it can be a combination of fluorocarbon coating and graphite material. Correspondingly, the second anti-oxidation coating can also be selected from any one or more combinations of existing anti-oxidation materials. For example, the second anti-oxidation coating can be an anti-oxidation material such as fluorocarbon coating or graphite, or it can be a combination of fluorocarbon coating and graphite material. This is only an example and is not specifically limited.

[0094] In some examples, such as Figure 1 and Figures 4 to 6 As shown, the photovoltaic module also includes a cover plate 50, which is used to cover the surface of the first encapsulation film layer 10 away from the battery layer 20, and the surface of the second encapsulation film layer 40 away from the battery layer 20. Exemplarily, the cover plate 50 can be a glass cover plate, a plastic cover plate, or the like with a light-transmitting function. Furthermore, the surface of the cover plate 50 covering the first encapsulation film layer 10 facing the first encapsulation film layer 10 can be a concave-convex surface, thereby increasing the utilization rate of the incident light; the surface of the cover plate 50 covering the second encapsulation film layer 40 facing the second encapsulation film layer 40 can be a concave-convex surface, thereby increasing the utilization rate of the incident light.

[0095] Further, the first encapsulation film layer can be any one or more of organic encapsulation films such as ethylene-vinyl acetate copolymer (EVA) film, polyethylene octene co-elastomer (POE) film, polyvinyl butyral resin (PVB) or polyethylene terephthalate (PET) film, and the second encapsulation film layer can also be any one or more of organic encapsulation films such as ethylene-vinyl acetate copolymer (EVA) film, polyethylene octene co-elastomer (POE) film, polyvinyl butyral resin (PVB) or polyethylene terephthalate (PET) film. The materials of the first encapsulation film layer and the second encapsulation film layer can be the same or different, which is only an example here and is not specifically limited.

[0096] In summary, the photovoltaic module provided by the present application achieves at least the following beneficial effects:

[0097] In the actual production process, since the surface of the solar cell needs to be welded with welding ribbons, and the welding ribbons themselves have a certain thickness, after lamination, the individual first welding ribbons welded on the first surface of the solar cell may directly penetrate the first packaging film layer, causing water vapor to enter continuously. And compared with other positions, the risk of puncturing the film at the first welding point is greater. Based on this, the present application applies a first anti-oxidation coating on the side of the first welding ribbon away from the first surface, and the first anti-oxidation coating at least covers the surface of the first welding point to ensure that the first welding point is not exposed outside the first anti-oxidation coating, and reduces the oxidation and erosion of the first welding point by water vapor as much as possible, thereby reducing the oxidation and erosion of the entire photovoltaic module by water vapor, and improving the oxidation resistance of the photovoltaic module; at the same time, the first anti-oxidation coating is only coated on the side of the first welding ribbon away from the first surface of the solar cell, and will not affect the welding performance of the first welding ribbon.

[0098] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module comprises a battery layer and a first encapsulation film layer stacked in sequence from bottom to top, the battery layer comprises a plurality of electrically connected solar cells, and the photovoltaic module further comprises a welding ribbon, and two adjacent solar cells are electrically connected via the welding ribbon; The solar cell has a first surface and a second surface opposite to each other, the first surface of the solar cell faces the first encapsulation film layer; on the first surface, the solar cell comprises a first grid line extending along a first direction, and the first grid line has a plurality of first welding points distributed at intervals; The welding strip comprises a first welding strip extending along a first direction, the first welding strip is located between the first encapsulation film layer and the first surface of the solar cell sheet, and the first welding strip is welded to the first grid line through the first welding point; The photovoltaic module further includes a first anti-oxidation coating located on a side of the first welding strip away from the first surface, and a projection of the first anti-oxidation coating on the first surface at least covers a projection of the first welding point on the first surface.

2. The photovoltaic module according to claim 1, characterized in that: The projection of the first anti-oxidation coating on the first surface covers the projection of the first gate line on the first surface.

3. The photovoltaic module according to claim 1, characterized in that: Along the second direction, the projection width of the first anti-oxidation coating on the first surface at least covers the projection width of the first gate line on the first surface, the second direction is perpendicular to the first direction, and the plane formed by the first direction and the second direction is parallel to the first surface.

4. The photovoltaic module according to claim 1, characterized in that: Along the first direction, a projection length of the first anti-oxidation coating on the first surface at least covers a projection length of the first gate line on the first surface.

5. The photovoltaic module according to claim 1, characterized in that: In the third direction, the first anti-oxidation coating has a thickness D1, 0<D1≤5μm; the third direction is perpendicular to the first surface.

6. The photovoltaic module according to claim 1, characterized in that: The photovoltaic module further comprises a second encapsulation film layer located on a side of the cell layer away from the first encapsulation film layer, and the second surface of the solar cell sheet faces the second encapsulation film layer; On the second surface, the solar cell sheet includes a second grid line extending along the first direction, and the second grid line has a plurality of second welding points distributed at intervals; The welding strip further includes a second welding strip extending along the first direction, the second welding strip is located between the second encapsulation film layer and the second surface of the solar cell sheet, and the second welding strip is welded to the second grid line through the second welding point; The photovoltaic module further includes a second anti-oxidation coating located on a side of the second welding strip away from the second surface, and a projection of the second anti-oxidation coating on the second surface covers a projection of the second welding point on the second surface.

7. The photovoltaic module according to claim 6, characterized in that: The projection of the second anti-oxidation coating on the second surface covers the projection of the second grid line on the second surface.

8. The photovoltaic module according to claim 6, characterized in that: Along the second direction, the projection width of the second anti-oxidation coating on the second surface at least covers the projection width of the second gate line on the second surface, the second direction is perpendicular to the first direction, and the plane formed by the first direction and the second direction is parallel to the second surface.

9. The photovoltaic module according to claim 6, characterized in that: Along the first direction, a projection length of the second anti-oxidation coating on the second surface at least covers a projection length of the second gate line on the second surface.

10. The photovoltaic module according to claim 6, characterized in that: In a third direction, the second anti-oxidation coating has a thickness D2, 0<D2≤5μm; and the third direction is perpendicular to the second surface.

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