Sealing device of photovoltaic module

Abstract

The utility model discloses a sealing device of a photovoltaic module, which relates to the technical field of photovoltaic battery power generation and comprises a first substrate, and a first layer of packaging adhesive film, a battery string group and a second layer of packaging adhesive film are sequentially arranged at the upper end of the first substrate. The peripheral edges of the first-layer packaging adhesive film, the battery string group and the second-layer packaging adhesive film are sealing tapes, and the bonding layers of the sealing tapes are located at the bottoms of the sealing tapes and located above the first-layer substrate; packaging adhesive tapes, namely a first adhesive tape and a second adhesive tape, are arranged on the left side of the sealing tape; wherein the first adhesive tape is located above the first substrate, and the second adhesive tape is located above the first adhesive tape; and the topmost layer is the second layer of substrate. When the assembly is laminated and packaged, the packaging adhesive film of the assembly is in a three-dimensional network structure through a cross-linking reaction of a linear molecular structure, and along with the rise of the lamination packaging temperature, the sealing tape is melted to be in a high-fluidity and high-adhesion molten state and can be well fused into the three-dimensional network structure to form good compactness.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cell power generation, in particular to a sealing device for a photovoltaic component. Background Art

[0002] With the development of photovoltaic technology, the power and conversion efficiency of photovoltaic cells are getting higher and higher. Since high-power and high-conversion-efficiency cells are more sensitive to environmental factors such as water vapor, especially the current TOPCon and HJT battery processes have increasingly higher requirements for the water vapor packaging of components, high-sealing device packaging methods are very important now and in the future.

[0003] Currently, mainstream manufacturers generally use butyl rubber for packaging. Although butyl rubber has a very low water vapor permeability, its adhesive properties are poor and its compatibility with the packaging materials of photovoltaic modules is poor. During the 20-30-year service life of photovoltaic modules, there is a risk of delamination between butyl rubber and the photovoltaic substrate, which can easily cause water vapor to penetrate into the module from the interlayer of the packaging material. Utility Model Content

[0004] The purpose of this utility model is to provide a sealing device for a photovoltaic module to solve the problem that the poor sealing of the current photovoltaic module leads to water vapor penetration and module failure. Through this utility model, the photovoltaic module can achieve a lower water vapor transmission rate, reduce the water vapor from entering the module through the periphery and corroding the photovoltaic cells, extend the reliability of the photovoltaic cells, and thus bring more power generation gain. In order to solve the above technical problems, the utility model provides a sealing device for a photovoltaic module, specifically:

[0005] A sealing device for a photovoltaic module includes a first substrate, which is the bottom layer. The upper end of the first substrate is sequentially provided with a first layer of packaging film, a battery string group, and a second layer of packaging film; the edges of the first layer of packaging film, the battery string group, and the second layer of packaging film are sealed with a sealing tape, and the adhesive layer of the sealing tape is located at the bottom of the sealing tape and above the first layer of the substrate; the left side of the sealing tape is provided with a packaging adhesive tape, namely a first adhesive tape and a second adhesive tape; wherein the first adhesive tape is located above the first substrate, and the second adhesive tape is located above the first adhesive tape; and the topmost layer is the second layer of the substrate.

[0006] Furthermore, when the components are laminated and packaged, the packaging films of the components, i.e. the first layer of packaging film and the second layer of packaging film, are cross-linked by linear molecular structures to form a three-dimensional network structure. As the temperature of the laminated packaging increases, the sealing tape melts and is in a molten state with high fluidity and high adhesion, which can be well integrated into the three-dimensional network structure to form good density; at the same time, when the components are operated outdoors at high temperature, the sealing tape is in a molten and highly adhesive state under the action of high temperature, thereby preventing water vapor from penetrating from between the material layers into the interior of the component.

[0007] Furthermore, the first substrate and the second substrate are made of tempered or semi-tempered photovoltaic glass with zero water transmittance and high light transmittance, with a thickness of 1.6 to 3.2 mm and a light transmittance setting range of 92 to 94%.

[0008] Furthermore, the first layer of encapsulation film and the second layer of encapsulation film are made of the same material or different materials.

[0009] Furthermore, the sealing tape is made of thermoplastic material. The function of the sealing tape is to increase the density of the packaging film during the component lamination process and to better block the lamination penetration of water vapor when the component is in a molten state when operating outdoors at high temperature. The sealing tape is made of EVA / POE or other thermoplastic material with a melting temperature of 60-100°C and is solid at room temperature (25°C). The shape is square, rectangular, circular or other shapes. The thickness of the sealing tape is 1-2 mm thicker than the two layers of packaging film, or the thickness can be set according to the thickness of the packaging film.

[0010] Furthermore, the thickness of the adhesive layer of the sealing tape is 0.01 to 0.05 mm; the separation membrane of the sealing tape has the function of providing a quick separation effect and can provide a quick separation effect when bonding, including PET material, with a thickness range of 0.1 to 0.3 mm.

[0011] Furthermore, the packaging adhesive tape includes a thermosetting adhesive film of EVA / EPE / POE for photovoltaic use; the thickness and material combination of the packaging adhesive tape are consistent with those of the first layer of packaging film and the second layer of packaging film.

[0012] The working principle and production method of the utility model are as follows:

[0013] When the components are laminated and packaged, the packaging films of the components, namely the first and second layers of packaging films, undergo a cross-linking reaction from linear molecular structures to form a three-dimensional network structure. As the lamination packaging temperature increases, the sealing tape melts into a molten state with high fluidity and high adhesion, and can be well integrated into the three-dimensional network structure to form a good density. At the same time, when the components are operated outdoors at high temperatures, the sealing tape is in a molten and highly adhesive state under the action of the high temperature, preventing water vapor from penetrating from the material layers into the interior of the component, further improving the sealing of the component. The specific steps of the method are:

[0014] Step 1: Laying the first substrate;

[0015] Step 2: Laying a first layer of encapsulation film; Laying the first layer of encapsulation film horizontally and centered on the surface of the first substrate. The function of the first layer of encapsulation film is to provide high light transmittance and adhesion. The first layer of encapsulation film is a thermosetting EVA / EPE / POE film for photovoltaics, with a thickness of 0.4-0.6 mm and a light transmittance setting range of 91-93%;

[0016] Step 3: Laying out photovoltaic cell strings; placing the photovoltaic cell strings connected in series or in parallel horizontally and centrally on the surface of the first layer of encapsulation film. The photovoltaic cell strings provide the main power generation for the photovoltaic module. The cells include PERC, TOPCon, and HJT photovoltaic cells, and can also be used to encapsulate other photovoltaic cells. The size of the first layer of encapsulation film is 3 to 5 mm larger than the photovoltaic cell strings.

[0017] Step 4: Laying the second layer of encapsulation film: Lay the second layer of encapsulation film horizontally and centered on the photovoltaic cell string. The size of the second layer of encapsulation film is consistent with that of the first layer of encapsulation film, and the four sides are aligned with the first layer of encapsulation film. The second layer of encapsulation film is used to provide adhesion. The second layer of encapsulation film is a thermosetting film including EVA / EPE / POE for photovoltaic use, with a thickness of 0.4-0.6 mm and a transmittance setting range of 91-93%.

[0018] Step 5: Pressing and pre-fixing the sealing tape: Tear off the separation film with the sealing tape adhesive layer on one side of the sealing tape, and press and pre-fix the sealing tape on the packaging film, respectively. The two layers of packaging film are 10-15 mm away from the first substrate. The sealing tape is adhered to the edges of the two layers of packaging film. The sealing tape is adhered to the first substrate, that is, on the surface of the first substrate around the edges of the first and second layers of packaging film, with the outer edges 10-15 mm away from the outer edge of the glass. The sealing tape serves to block the infiltration of water vapor.

[0019] Step 6: Laying the encapsulating adhesive tape: Cut two layers of encapsulating adhesive tape, one on top and one on the bottom, to the same width as the sealing tape to the edge of the glass. Lay the first and second layers of adhesive tape around the edges of the glass. Laying the encapsulating adhesive tape serves to adhere and seal the first and second substrates, while preventing the sealing tape from flowing out of the glass.

[0020] Step 7: Laying the second substrate: The second substrate is laid on the uppermost layer. The second substrate serves as a protective layer. The second substrate is made of 0 water-permeable and highly transparent tempered or semi-tempered photovoltaic glass with a thickness of 1.6 to 3.2 mm.

[0021] Step 8: After the laying is completed, a sealing device of the photovoltaic module is completed through lamination and assembly processes to prepare the sealing device of the photovoltaic module.

[0022] Compared with the existing solutions, the beneficial effects of the present invention are:

[0023] 1. Compared to conventional modules and module packaging methods, this utility model uses a low melt index sealing tape. During the lamination process, the molten state can fully fill the gaps in the three-dimensional network structure of the packaging film, greatly increasing the density of the packaging film and reducing the water vapor transmission rate. At the same time, when the module is operated outdoors at high temperatures, the sealing tape is in a molten state, effectively blocking water vapor from penetrating from the material layers into the module. This can significantly extend the service life of the module, thereby generating greater power generation benefits.

[0024] 2. The sealing tape uses the same base material as the packaging film, which has better bonding performance. Compared with butyl rubber, which has the risk of delamination, the sealing tape of this utility model has better reliability. At the same time, on the process side, the process stability and matching of the same base material are better, and compared with other methods, the component packaging yield is higher.

[0025] 3. The sealing tape base material is made of thermoplastic sealing material, which is solid at room temperature, making it easier and more convenient to operate. The pressure-sensitive adhesive surface is provided with a release film. During the bonding and pre-fixing process, this method has higher separation and bonding efficiency than other sealing methods using butyl adhesive.

[0026] 4. The sealing tape of this method can be the same transparent color as the packaging film, or other colors (red or yellow, etc.) can be selected to make the appearance design of the component more diverse and more beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of a sealing device prepared by a sealing device of a photovoltaic module according to the present invention;

[0028] Figure 2 A schematic plan view of a sealing device prepared by a sealing device for a photovoltaic module according to the present invention;

[0029] 1-second substrate, 2-second packaging film layer, 3-photovoltaic cell string, 4-first packaging film layer, 5-sealing tape, 6-sealing tape adhesive layer, 7-second adhesive tape, 8-first adhesive tape, 9-first substrate. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and effect of the present invention more clear and explicit, the following examples are given to further illustrate the present invention in detail. It should be noted that the specific implementation described here is only used to explain the present invention and is not intended to limit the present invention.

[0031] This utility model proposes a sealing device for photovoltaic modules. Its sealing principle is that when the modules are laminated and packaged, the module's encapsulating film undergoes a cross-linking reaction from its linear molecular structure to form a three-dimensional network structure. As the lamination and packaging temperature rises, the sealing tape melts into a molten state with high fluidity and adhesion, allowing it to be well integrated into the three-dimensional network structure, achieving excellent density. Furthermore, when the modules are operated outdoors at high temperatures, the sealing tape remains molten and highly adherent due to the high temperature, preventing moisture from penetrating the module interior through the interlayers, further improving the module's sealing performance.

[0032] The utility model proposes a sealing device for a photovoltaic module. Figures 1-2 As shown, the device includes a first substrate 9, which is the bottom layer. The upper end of the first substrate 9 is sequentially provided with a first layer of packaging film 4, a battery string group 3, and a second layer of packaging film 2; the edges of the first layer of packaging film 4, the battery string group 3, and the second layer of packaging film 2 are sealed with a sealing tape 5, and the adhesive layer 6 of the sealing tape is located at the bottom of the sealing tape 5 and above the first layer of substrate 9; the left side of the sealing tape is the packaging adhesive tape, namely the first adhesive tape 8 and the second adhesive tape 7; wherein the first adhesive tape 8 is located above the first substrate 9, and the second adhesive tape 7 is located above the first adhesive tape 8); the top layer is the second layer of substrate 1.

[0033] The first substrate 9 and the second substrate 1 in the device of the present invention are made of tempered or semi-tempered photovoltaic glass with a thickness of 1.6 to 3.2 mm and a transmittance setting range of 92 to 94%. The first layer of packaging film 4 and the second layer of packaging film 2 are made of the same material or different materials. The sealing tape 5 is made of a thermoplastic material. The sealing tape 5 is EVA / POE or other thermoplastic material with a melting temperature of 60 to 100°C and is solid at room temperature (25°C). The shape is square, rectangular, circular or other shapes. The thickness of the sealing tape 5 is 1 to 2 mm thicker than the two layers of packaging film, or the thickness is set according to the thickness of the packaging film. The thickness of the adhesive layer of the sealing tape is 0.01 to 0.05 mm. The separation film of the sealing tape 5 includes PET material with a thickness range of 0.1 to 0.3 mm. The packaging adhesive tape includes a thermosetting EVA / EPE / POE film for photovoltaics; the thickness and material of the packaging adhesive tape are consistent with those of the first layer packaging film 4 and the second layer packaging film 2.

[0034] The details of the manufacturing method of a sealing device for a photovoltaic module of the utility model are as follows:

[0035] Step 1: Laying the first substrate 9: The main function of this substrate is to provide light transmission and protection. Usually, tempered or semi-tempered photovoltaic glass with zero water permeability and high light transmittance is used. The thickness is usually 1.6 to 3.2 mm, and the transmittance setting range is 92 to 94%.

[0036] Step 2: Lay the first layer of packaging film 4: Lay the first layer of film horizontally and centrally on the surface of the first substrate 9. The dimensions of the first layer of packaging film 4 are 3 to 5 mm larger than the photovoltaic cell string group 3. The function of this layer of packaging film is to provide high light transmittance and adhesion. It is usually made of, but not limited to, thermosetting films such as EVA / EPE / POE for photovoltaics. The thickness is usually 0.4 to 0.6 mm, and the transmittance is set in the range of 91 to 93%.

[0037] Step 3: Laying photovoltaic cell strings 3: Place the series or parallel cell strings horizontally and centrally on the surface of the first layer of encapsulation film 4. The photovoltaic cell strings 3 mainly provide the main power generation for the photovoltaic module. The cells include but are not limited to PERC, TOPCon, HJT and other photovoltaic cells.

[0038] Step 4: Lay the Second Layer of Encapsulating Film 2: The second layer of encapsulating film 2 is laid horizontally and centered on the photovoltaic cell string 3. The dimensions of the second layer of encapsulating film 2 match those of the first layer of encapsulating film 4, and the edges are aligned with the first layer of encapsulating film 4. The second layer of encapsulating film 2 serves as an adhesive. It is typically made of, but not limited to, thermosetting films such as EVA, EPE, or POE for photovoltaic applications. It typically has a thickness of 0.4 to 0.6 mm and a transmittance range of 91 to 93%. It can be made of the same material as the first layer of film, or a different material.

[0039] Step 5: Press and pre-fix the sealing tape 5: Tear off the separation film with the sealing tape adhesive layer 6 on one side of the sealing tape 5 base material, and press and pre-fix the sealing tape 5 on the packaging film. The two layers of packaging film are 10-15 mm away from the first substrate 9. The sealing tape 5 is adhered to the edges of the two layers of packaging film. The sealing tape 5 is adhered to the first substrate 9, that is, on the surface of the first substrate 9 around the edges of the first and second layers of packaging film 4, 2, with the outer edge 10-15 mm away from the outer edge of the glass. The function of the sealing tape 5 is to block the infiltration of water vapor.

[0040] Sealing tape 5 is made of a thermoplastic material. Its primary function is to increase the density of the encapsulation film during the component lamination process and, when the component is in a molten state during outdoor high-temperature operation, to better block the lamination penetration of water vapor. Materials include, but are not limited to, EVA / POE or other equivalent materials. The melting temperature is typically set at 60-100°C and it is solid at room temperature (25°C). The shape can typically be square or rectangular, but is not limited to circular or other shapes. The thickness can be customized based on the thickness of the encapsulation film and is typically 1-2 mm thicker than the two layers of encapsulation film.

[0041] The sealing tape adhesive layer 6 is made of a UV-resistant and aging-resistant pressure-sensitive adhesive layer, which has adhesion properties at room temperature and can play a good bonding pre-fixing role. The thickness is usually set to 0.01 to 0.05 mm;

[0042] Separation layer of the sealing tape: The function of this layer is to provide a quick separation effect, and can provide a quick separation effect when bonding, including but not limited to PET material, with a thickness range of 0.1 to 0.3 mm.

[0043] Step 6: Laying the Encapsulating Adhesive Tape: Cut two layers of encapsulating adhesive tape (6 - sealing tape adhesive layer, 7 - first adhesive tape) to the same width as the sealing tape to the glass edge and lay them around the edges of the glass. This step primarily serves to bond and seal the first and second substrates 9 and 1, while preventing the sealing tape from leaking out of the glass. Thermosetting adhesive films such as EVA, EPE, and POE, typically used for photovoltaic applications, are used, but are not limited to these. The thickness and material should be consistent with those of the first and second encapsulating films 4 and 2.

[0044] Step 7: Laying the second substrate 1: The second substrate 1 mainly serves as a protective layer, and usually adopts 0 water-transmittance and high-transmittance tempered or semi-tempered photovoltaic glass, with a thickness of 1.6 to 3.2 mm.

[0045] Step 8: After laying is completed, a sealing device of the photovoltaic module is completed through lamination, assembly and other processes.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as within the scope of protection of the present invention.

Claims

1. A sealing device for a photovoltaic module, characterized in that: The device comprises a first substrate (9), wherein the first substrate (9) is a bottom layer, and the upper end of the first substrate (9) is sequentially provided with a first layer of packaging film (4), a battery string group (3), and a second layer of packaging film (2); the edges of the first layer of packaging film (4), the battery string group (3), and the second layer of packaging film (2) are sealed with a sealing tape (5), and the adhesive layer (6) of the sealing tape is located at the bottom of the sealing tape (5) and above the first substrate (9); the left side of the sealing tape is a packaging adhesive tape, namely a first adhesive tape (8) and a second adhesive tape (7); wherein the first adhesive tape (8) is located above the first substrate (9), and the second adhesive tape (7) is located above the first adhesive tape (8); and the topmost layer is the second substrate (1).

2. A sealing device for a photovoltaic module according to claim 1, characterized in that: The first substrate (9) and the second substrate (1) are made of tempered or semi-tempered photovoltaic glass with a thickness of 1.6 to 3.2 mm and a light transmittance setting range of 92 to 94%.

3. The sealing device of a photovoltaic module according to claim 1, characterized in that: The first layer of packaging film (4) and the second layer of packaging film (2) are made of the same material or different materials.

4. The sealing device of a photovoltaic module according to claim 1, characterized in that: The sealing tape (5) is made of a thermoplastic material. The sealing tape (5) is EVA / POE or other thermoplastic materials, has a melting temperature of 60-100°C, is solid at room temperature (25°C), and has a square, rectangular, circular or other shape. The thickness of the sealing tape (5) is 1-2 mm thicker than the two layers of packaging films, or the thickness is set according to the thickness of the packaging films.

5. The sealing device of a photovoltaic module according to claim 1, characterized in that: The adhesive layer of the sealing tape has a thickness of 0.01 to 0.05 mm; the separation film of the sealing tape (5) comprises a PET material and has a thickness ranging from 0.1 to 0.3 mm.

6. The sealing device of a photovoltaic module according to claim 1, characterized in that: The packaging adhesive tape comprises a thermosetting adhesive film of EVA / EPE / POE for photovoltaic use; the thickness and material combination of the packaging adhesive tape are consistent with those of the first layer of packaging film (4) and the second layer of packaging film (2).

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