Heterojunction photovoltaic module capable of improving water blocking performance

Abstract

The utility model discloses a heterojunction photovoltaic assembly capable of improving water resistance performance, which belongs to the technical field of photovoltaic devices and comprises a battery panel and an aluminum frame, the peripheral edge of the battery panel is sealed by an aluminum foil adhesive tape, and the aluminum frame is adhered to the sealed edge of the aluminum foil adhesive tape through high-water-resistance silica gel; the battery panel comprises front tempered glass, a light conversion film EVA, a plurality of heterojunction half-piece main-grid-free battery strings, high-transmittance EVA and back tempered glass which are sequentially arranged in a laminated mode, and after all layers of assemblies are laminated, aluminum foil adhesive tape is adopted for edge sealing treatment; the drainage holes are evenly formed in the side edge of the aluminum frame at set intervals. According to the utility model, the periphery of the battery panel is sealed by using the aluminum foil adhesive tape, and the battery panel and the aluminum frame are bonded by using the high-water-resistance silica gel, so that water vapor can be well prevented from permeating into the battery panel, and the sealing effect and the weather resistance of the photovoltaic module are improved; the drain holes are formed in the edge of the aluminum frame, so that water vapor accumulated between the battery panel and the aluminum frame can be prevented from permeating the battery panel.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic device technology, specifically relating to a heterojunction photovoltaic module with improved water-blocking performance. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Solar cells can convert light energy into electrical energy, but solar cells cannot be used directly. They need to be encapsulated to ensure their environmental tolerance and to have certain mechanical properties. This encapsulated device is called a photovoltaic module.

[0004] Currently, ordinary EVA (ethylene-vinyl acetate copolymer) is commonly used in the production process of heterojunction photovoltaic modules. The sealing and protection of the edges have a significant impact on the performance and lifespan of photovoltaic modules. Photovoltaic modules operating outdoors for extended periods are susceptible to moisture penetration, leading to hydrolysis of the encapsulating film and electro-induced degradation of the photovoltaic module, thus affecting its lifespan. Utility Model Content

[0005] To address the aforementioned issues, this invention provides a heterojunction photovoltaic module with improved water-blocking performance, which enhances the edge sealing and water-blocking properties of the battery panel while preventing moisture accumulation between the battery panel and the aluminum frame.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A heterojunction photovoltaic module with improved water resistance includes a battery panel and an aluminum frame. The four edges of the battery panel are sealed with aluminum foil tape, and the aluminum frame is bonded to the aluminum foil tape sealing the four edges of the battery panel with high water resistance silicone.

[0008] The battery panel includes a front tempered glass, a light-converting film EVA, multiple heterojunction half-cell gridless battery strings, high-transparency EVA, and a back tempered glass stacked in sequence. After each layer of components in the battery panel is laminated, aluminum foil tape is used for edge sealing.

[0009] A junction box is provided on the back of the battery panel;

[0010] The aluminum frame is provided with grounding holes, drainage holes and mounting holes; the drainage holes are evenly arranged on the aluminum frame at a set interval.

[0011] Preferably, the heterojunction half-cell gridless solar cell string uses heterojunction half-cell double-sided gridless solar cells, which are electrically interconnected with the solar cells and fine grid lines by low-temperature photovoltaic welding to form a series structure.

[0012] Preferably, the positive and negative terminals of the plurality of heterojunction half-cell gridless battery strings are arranged and then welded to the solder strips at the beginning and end of the battery strings through busbars to form series and parallel circuits.

[0013] Preferably, a junction box is provided on the back of the battery panel; the junction box is a three-part junction box, which includes a left junction box, a middle junction box and a right junction box, each including a box body, a box cover and modular photovoltaic elements installed in the corresponding box body.

[0014] Preferably, the junction box is bonded to the back of the battery panel using high water-resistant silicone.

[0015] Preferably, the drainage holes are located at the four corners of the photovoltaic module.

[0016] Preferably, the grounding hole is located at one end of the photovoltaic module, and the grounding wire is led out from the aluminum frame through the grounding hole.

[0017] Preferably, the size and location of the mounting holes are determined according to the photovoltaic module's design and the specific structure of the photovoltaic mounting bracket.

[0018] Compared with the prior art, the advantages and positive effects of this utility model are:

[0019] This invention uses aluminum foil tape with extremely low water vapor permeability to seal the edges of the battery panel, and uses high water-resistant silicone to bond the battery panel to the aluminum frame. This effectively prevents water vapor from penetrating into the battery panel, improving the sealing effect and weather resistance of the photovoltaic module. At the same time, drainage holes are set at the edge of the aluminum frame to prevent water vapor accumulated between the battery panel and the aluminum frame from penetrating the battery panel. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0021] Figure 1 This is a cross-sectional schematic diagram of a photovoltaic module according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the battery panel structure of the photovoltaic module according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a half-cell gridless solar cell structure of a photovoltaic module according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the aluminum foil tape sealing edge of the photovoltaic module according to an embodiment of the present invention;

[0025] Figure 5 This is a front structural diagram of a photovoltaic module according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the back structure of a photovoltaic module according to an embodiment of the present invention;

[0027] In the diagram: 1. Front tempered glass; 2. Light-converting EVA film; 3. Heterojunction half-cell gridless battery string; 3-1. Busbar; 4. High-transparency EVA; 5. Back tempered glass; 6. Aluminum foil tape; 7. Aluminum frame; 8. High water-resistant silicone; 9. Grounding hole; 10. Drain hole; 11. Mounting hole; 12. Junction box. Detailed Implementation

[0028] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0029] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses a heterojunction photovoltaic module with improved water-blocking performance, such as... Figure 1 , Figure 5 As shown, it includes a battery panel and an aluminum frame 7. The four edges of the battery panel are sealed with aluminum foil tape 6, and the aluminum frame 7 is bonded to the aluminum foil tape 6 on the four edges of the battery panel with high water-resistant silicone 8.

[0030] Six aluminum foil tapes with extremely low water vapor permeability are used to seal the edges of the battery panel before framing. At the same time, high water-resistant silicone is used to bond the battery panel to the aluminum frame. This effectively prevents water vapor from penetrating into the battery panel, improving the sealing effect and weather resistance of the photovoltaic module.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the battery panel consists of a front tempered glass 1, a light-converting film EVA 2, multiple heterojunction half-cell gridless battery strings 3, a busbar 3-1, a high-transparency EVA 4, and a back tempered glass 5, which are stacked in sequence. After each layer of components in the battery panel is laminated, the edges of the battery panel are sealed with aluminum foil tape 6. The heterojunction half-cell gridless battery strings use heterojunction half-cell double-sided gridless battery cells.

[0032] In this embodiment, the surface of the tempered glass on the front is provided with an anti-reflective film, which is an inorganic silica film with excellent chemical stability and good weather resistance, thereby increasing the weather resistance and mechanical properties of the photovoltaic module; EVA is an ethylene-vinyl acetate copolymer; the light-converting film EVA is EVA with added ultraviolet absorbers and light-converting powder, which can convert ultraviolet light into light that can be directly absorbed by the photovoltaic cell; high-transmittance EVA has high light transmittance, high cross-linking degree, and excellent weather resistance; and it has good adhesion to tempered glass.

[0033] In this embodiment, the heterojunction half-cell gridless solar cell string 3 uses heterojunction half-cell double-sided gridless solar cells, which are electrically interconnected with the solar cells and fine grid lines by low-temperature photovoltaic welding to form a series structure.

[0034] The positive and negative terminals of multiple heterojunction half-cell gridless battery strings are arranged and then welded to the solder strips at the beginning and end of the battery strings through busbars to form series and parallel circuits.

[0035] Photovoltaic solder ribbon refers to a material consisting of a copper strip of a certain size coated with a uniformly thick layer of tin-based solder. Photovoltaic solder ribbon includes room-temperature solder ribbon and low-temperature solder ribbon. Low-temperature solder ribbon is made from an alloy material with a melting point below 450℃, based on room-temperature solder ribbon. It typically contains metals such as aluminum, copper, nickel, and zinc, and also includes a certain proportion of welding aids, such as activators, rheology modifiers, and thickeners. These components can rapidly melt at low temperatures and bond with the substrate being welded, forming a strong weld joint.

[0036] like Figure 1 , Figure 6 As shown, a junction box 12 is provided on the back of the battery panel. In this embodiment, the junction box is a three-part junction box, which includes a left junction box, a middle junction box, and a right junction box. Each of the three junction boxes includes a box body, a box cover, and modular photovoltaic elements installed in the corresponding box body. The junction box 12 is bonded to the back of the battery panel with high water-resistant silicone.

[0037] like Figure 6 As shown, the aluminum frame 7 is provided with a grounding hole 9, a drainage hole 10, and a mounting hole 11. The grounding hole 9 is located at one end of the photovoltaic module and is perpendicular to the direction of the battery panel. The grounding wire is led out from the aluminum frame through the grounding hole 9. The drainage holes 10 are evenly arranged on the side of the aluminum frame at a set interval. In this embodiment, the drainage holes 10 can be located at the four corners of the photovoltaic module. This arrangement can directly drain the water vapor between the aluminum frame and the battery panel from the aluminum frame, preventing the water vapor accumulated between the aluminum frame and the battery panel from penetrating the battery panel.

[0038] In this embodiment, the mounting hole 11 is used to connect the photovoltaic module to the photovoltaic mounting bracket. The size and location of the mounting hole 11 can be flexibly determined according to the actual required size of the photovoltaic module and the specific structure and size of the photovoltaic mounting bracket.

[0039] The above photovoltaic module installation method is as follows:

[0040] The following layers are stacked sequentially from top to bottom: back tempered glass 5, high-transparency EVA 4, multiple heterojunction half-cell gridless battery strings 3, light-converting film EVA 2, and front tempered glass 1;

[0041] The heterojunction half-cell gridless solar cell string uses heterojunction half-cell bifacial gridless solar cells, which are welded by low-temperature photovoltaic ribbon to electrically interconnect the ribbon with the solar cells and fine grid lines to form a series structure.

[0042] The positive and negative terminals of multiple heterojunction half-cell gridless battery strings are arranged and then welded to the solder strips at the beginning and end of the battery strings through busbars to form series and parallel circuits.

[0043] After lamination, aluminum foil tape 6 is used to seal the edges of the battery panel.

[0044] Then apply a set amount of high water-resistant silicone 8 to the aluminum frame and assemble the aluminum frame onto the four edges of the battery panel.

[0045] Then, attach the junction box to the back of the tempered glass 5 using high water-resistant silicone 8.

[0046] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A heterojunction photovoltaic module with improved water-blocking performance, characterized in that, Including the battery panel and the aluminum frame, the four edges of the battery panel are sealed with aluminum foil tape, and the aluminum frame is bonded to the aluminum foil tape sealing the four edges of the battery panel with high water-resistant silicone. The battery panel includes a front tempered glass, a light-converting film EVA, multiple heterojunction half-cell gridless battery strings, high-transparency EVA, and a back tempered glass stacked in sequence. After each layer of components in the battery panel is laminated, aluminum foil tape is used for edge sealing. A junction box is provided on the back of the battery panel; The aluminum frame is provided with grounding holes, drainage holes and mounting holes; the drainage holes are evenly arranged on the side of the aluminum frame at a set interval.

2. A heterojunction photovoltaic module with improved water-blocking performance as described in claim 1, characterized in that, The heterojunction half-cell gridless solar cell string uses heterojunction half-cell bifacial gridless solar cells, which are electrically interconnected with the solar cells and fine grid lines by low-temperature photovoltaic welding to form a series structure.

3. A heterojunction photovoltaic module with improved water-blocking performance as described in claim 1, characterized in that, The positive and negative terminals of the multiple heterojunction half-cell gridless battery strings are arranged and then welded to the solder strips at the beginning and end of the battery strings through busbars to form series and parallel circuits.

4. A heterojunction photovoltaic module with improved water-blocking performance as described in claim 1, characterized in that, The junction box is a three-part junction box, which includes a left junction box, a middle junction box and a right junction box. Each part includes a box body, a box cover and modular photovoltaic elements installed in the corresponding box body.

5. A heterojunction photovoltaic module with improved water-blocking performance as described in claim 1, characterized in that, The junction box is bonded to the back of the battery panel using high water-resistant silicone.

6. A heterojunction photovoltaic module with improved water-blocking performance as described in claim 1, characterized in that, The drainage holes are located at the four corners of the photovoltaic module.

7. A heterojunction photovoltaic module with improved water-blocking performance as described in claim 1, characterized in that, The grounding hole is located at one end of the photovoltaic module, and the grounding wire is led out from the aluminum frame through the grounding hole.

8. A heterojunction photovoltaic module with improved water-blocking performance as described in claim 1, characterized in that... The size and location of the mounting holes are determined based on the photovoltaic module's design and the specific structure of the photovoltaic mounting bracket.

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