Multi-layer heat insulation buffer piece for solar cell panel

Abstract

The utility model discloses a multi-layer heat insulation buffer member used for a solar cell panel, comprising an MPP foam layer, one side of the MPP foam layer is provided with a first cotton paper double-sided adhesive layer, one side of the first cotton paper double-sided adhesive layer far away from the MPP foam layer is provided with a heat insulation layer, one side of the heat insulation layer far away from the first cotton paper double-sided adhesive layer is provided with a second cotton paper double-sided adhesive layer, and the second cotton paper double-sided adhesive layer is provided with a third cotton paper double-sided adhesive layer. The multi-layer heat insulation buffer material effectively combines the buffer performance of the MPP foam, the heat insulation performance of the aerogel and the silver-plated polyimide film and the bonding stability of the cotton paper double-faced adhesive tape, and all-around protection on the solar cell panel is achieved. The multi-layer heat insulation buffer material has the advantages that the heat insulation performance of the MPP foam, the heat insulation performance of the aerogel and the silver-plated polyimide film and the bonding stability of the cotton paper double-faced adhesive tape are effectively combined;

Description

Technical Field

[0001] This utility model relates to the field of heat insulation and buffering materials, and in particular to a multi-layer heat insulation and buffering component for solar panels. Background Technology

[0002] Solar panels suffer from heat accumulation and efficiency degradation under high-temperature environments. Traditional insulation materials such as single-layer foam or ordinary tape cannot simultaneously meet the requirements of heat insulation, cushioning, and weather resistance. While existing PE foam double-sided adhesive offers some cushioning, its temperature resistance is insufficient (typically only up to 120℃) and it lacks reflective insulation functionality. Silver-based reflective films, when used alone, are prone to delamination due to mechanical vibration, resulting in poor adhesion stability to the backsheet of the solar panel. Furthermore, the closed-cell ratio and thermal conductivity of commonly available foam tapes (such as those with EVA or PE substrates) are not optimized for solar cell thermal management, making them prone to aging and failure under long-term high-temperature conditions.

[0003] Therefore, there is an urgent need to develop a heat insulation and buffering material that combines heat insulation and long-term weather resistance, to be applied to solar panels to solve the problem of heat accumulation, improve their working efficiency, and extend their service life. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a multi-layer heat insulation buffer for solar panels that meets the requirements of heat insulation, buffering, and high temperature resistance.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a multi-layer heat insulation buffer for solar panels, including an MPP foam layer, a first cotton paper double-sided adhesive layer disposed on one side of the MPP foam layer, a heat insulation layer disposed on the side of the first cotton paper double-sided adhesive layer away from the MPP foam layer, a second cotton paper double-sided adhesive layer disposed on the side of the heat insulation layer away from the first cotton paper double-sided adhesive layer, and a protective layer disposed on the side of the second cotton paper double-sided adhesive layer away from the heat insulation layer.

[0006] Furthermore, the MPP foam layer is flame-retardant MPP foam.

[0007] Furthermore, the thickness of the MPP foam ranges from 0.05 to 5 mm.

[0008] Furthermore, both the first and second cotton paper double-sided adhesive layers include a cotton paper layer, and both sides of the cotton paper layer are provided with a high-temperature resistant acrylic adhesive layer.

[0009] Furthermore, the thickness of the first and second cotton paper double-sided adhesive layers ranges from 0.03 to 0.15 mm.

[0010] Furthermore, the heat insulation layer includes an aerogel layer and a silver-plated polyimide film covering both sides of the aerogel layer.

[0011] Furthermore, the total thickness of the heat insulation layer is 0.05~3mm, and the thickness of the silver-plated polyimide film is 12~25um, wherein the silver plating thickness of the silver-plated polyimide film is 50-100nm.

[0012] Furthermore, the protective layer is a polyester film with a thickness ranging from 0.025 mm to 0.075 mm.

[0013] Furthermore, a graphite layer and / or a metal layer are provided between the second cotton paper double-sided adhesive layer and the protective layer.

[0014] The beneficial effects of this utility model are:

[0015] 1. This multi-layer thermal insulation and buffer material effectively combines the buffering performance of MPP foam, the thermal insulation performance of aerogel and silver-plated polyimide film, and the adhesive stability of cotton paper double-sided adhesive, achieving all-round protection for solar panels.

[0016] 2. By using flame-retardant MPP foam, the overall flame-retardant performance of the material is improved, enhancing safety.

[0017] 3. The thickness of each layer of material is reasonably designed, which not only ensures the heat insulation and buffering effect, but also ensures that the material is lightweight and portable, making it easy to install and use on solar panels.

[0018] 4. The addition of graphite or metal layers further enhances the thermal conductivity and electromagnetic shielding capabilities of the material, which helps to improve the working efficiency and stability of solar panels. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a multilayer heat insulation buffer for a solar panel according to an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the double-sided adhesive layer of cotton paper in a multilayer heat insulation buffer for solar panels according to an embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the structure of a multilayer heat insulation buffer for a solar panel, which is another embodiment.

[0022] The layers in the diagram are labeled as follows: MPP foam layer 1, first cotton paper double-sided adhesive layer 2, cotton paper layer 21, high-temperature resistant acrylic adhesive layer 22, heat insulation layer 3, second cotton paper double-sided adhesive layer 4, graphite layer 41, metal layer 42, and protective layer 5. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, an embodiment of this application discloses a multilayer heat insulation buffer for solar panels, including an MPP foam layer 1, a first cotton paper double-sided adhesive layer 2 disposed on one side of the MPP foam layer 1, a heat insulation layer 3 disposed on the side of the first cotton paper double-sided adhesive layer 2 away from the MPP foam layer 1, a second cotton paper double-sided adhesive layer 4 disposed on the side of the heat insulation layer 3 away from the first cotton paper double-sided adhesive layer 2, and a protective layer 5 disposed on the side of the second cotton paper double-sided adhesive layer 4 away from the heat insulation layer 3.

[0025] Specifically, through a roll forming process, the first cotton paper double-sided adhesive layer 2 and the second cotton paper double-sided adhesive layer 4 are first laminated onto the surface of the heat insulation layer 3, and then the MPP foam layer 1 is laminated onto the first cotton paper double-sided adhesive layer 2. The roll forming pressure is 0.5~1.2MPa, and the rolls are preheated at 45℃ for 30 minutes before roll forming, thereby ensuring a stronger bond between the multi-layer composite structures.

[0026] In this structure, the heat insulation layer 3 is laminated and bonded to the MPP foam layer 1 to form an alternating buffer heat insulation layer. This allows the tape to absorb mechanical vibration energy and prevent the propagation of microcracks in the battery cells. Furthermore, the MPP foam, which simultaneously provides buffering, heat insulation, and long-term aging resistance, is bonded to the heat insulation layer 3 with double-sided cotton paper adhesive to form an alternating buffer heat insulation layer. This disperses the heat conduction path, inhibits the longitudinal transfer of heat to the battery cells, and improves overall thermal management efficiency. At the same time, this structure has a low overall density, meeting lightweight requirements and mitigating the pressure of thermal expansion and contraction.

[0027] In this embodiment, the MPP foam layer 1 is flame-retardant MPP foam.

[0028] Specifically, the aforementioned MPP foam can be replaced with silicone foam or CR rubber foam, but flame-retardant MPP foam is preferred. Flame-retardant MPP foam has excellent flame-retardant and high-temperature resistance properties. This flame-retardant MPP foam is available for purchase. The flame-retardant MPP foam selected in this application meets the UL94V0 flame-retardant rating and has a temperature resistance of -40~300℃, making it suitable for outdoor extreme temperature difference environments. Furthermore, under humid heat conditions of 85℃ / 85%RH, its performance degradation rate is less than 10%. In addition, this flame-retardant MPP foam has a microporous foamed closed-cell structure with a pore size of <50μm and a thermal conductivity of <0.04W / (m·K), which can effectively block heat transfer and suppress heat accumulation in the high-temperature environment of the solar panel.

[0029] Specifically, the flame-retardant MPP foam is made of polypropylene substrate, which is lightweight and high-strength, with a density of 0.03~0.08g / cm³. It can replace traditional heavy materials, thereby reducing the overall structural weight and meeting the lightweight requirements of solar modules.

[0030] Specifically, the flame-retardant MPP foam has a compression resilience of ≥90% and a permanent deformation rate of ≤5%, which can absorb the stress generated by thermal expansion and contraction or mechanical vibration and protect the stability of internal components.

[0031] Specifically, this flame-retardant MPP foam is prepared using supercritical carbon dioxide technology. The production process is green and environmentally friendly, odorless, and leaves no chemical residues, complying with environmental standards such as RoHS and REACH.

[0032] In this embodiment, the thickness of the MPP foam ranges from 0.05 to 5 mm. Specifically, it can be 0.05 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm. The preferred thickness used in this invention is 5 mm.

[0033] In this embodiment, both the first cotton paper double-sided adhesive layer 2 and the second cotton paper double-sided adhesive layer 4 include a cotton paper layer 21, and high-temperature resistant acrylic adhesive layers 22 are provided on both sides of the cotton paper layer 21.

[0034] Specifically, this structure has good temperature resistance. Experiments have shown that the long-term temperature resistance of the cotton paper double-sided adhesive can reach 260℃; the peel force is >2000gf / inch, and the long-term reliability is excellent. In an environment of 85℃ / 85%RH, its adhesive strength decay rate is ≤15%, avoiding adhesive failure due to humid and hot environment; its holding force is >72H without displacement.

[0035] Specifically, the MPP foam layer 1 and the heat insulation layer 3 are bonded and fixed by the first cotton paper double-sided adhesive layer 2. Compared with traditional adhesives for other substrates, this cotton paper double-sided adhesive has the advantages of high adhesion and is not easy to delaminate the heat insulation material layer, ensuring that each layer of material maintains a stable bond under high temperature and vibration environment.

[0036] In this embodiment, the thickness of the first cotton paper double-sided adhesive layer 2 and the second cotton paper double-sided adhesive layer 4 ranges from 0.03 to 0.15 mm, specifically 0.03 mm, 0.05 mm, 0.08 mm, 0.1 mm, and 0.15 mm. The preferred thickness adopted in this invention is 0.1 mm.

[0037] In this embodiment, the heat insulation layer 3 includes an aerogel layer and a silver-plated polyimide film covering both sides of the aerogel layer, i.e.: heat insulation layer = silver-plated polyimide film + aerogel + silver-plated polyimide film. The total thickness of the heat insulation layer 3 is 0.05~3mm, specifically 0.05mm, 0.1mm, 0.2mm, 0.5mm, 1mm, 2mm, 3mm, etc. The preferred thickness used in this invention is 1mm. The thickness of the silver-plated polyimide film is 12~25um, specifically 12um, 17um, 25um, etc., wherein the silver plating thickness of the silver-plated polyimide film is 50-100nm, specifically 50nm, 70nm, 100nm, etc.

[0038] Specifically, experiments showed that the surface roughness Ra of the aforementioned heat insulation layer 3 structure is ≤0.2μm, achieving a reflectivity of ≥97%, effectively blocking heat transfer to the battery cells and reducing the module's operating temperature. Simultaneously, this silver-plated polyimide film covering the aerogel surface effectively prevents powder shedding, making the aerogel structure easy to process and die-cut for use.

[0039] Specifically, since aerogels can withstand temperatures from -40 to 300°C, and their performance degradation rate under humid heat aging (85°C / 85%RH) is less than 10%, delamination or oxidation failure can be avoided, thus ensuring their good thermal insulation properties.

[0040] Meanwhile, aerogel is renowned for its lightweight nature, with a density ≤1.2g / cm³, making it an outstanding material with the lowest thermal conductivity in the insulation industry, reaching as low as 0.01W / (mK). Furthermore, aerogel possesses multiple excellent properties, including fire resistance, hydrophobicity, and environmental friendliness. It effectively insulates heat, providing highly efficient thermal insulation protection for solar panels and thus extending their service life.

[0041] Therefore, this heat insulation layer 3 can effectively reduce the operating temperature of the battery cell by 10-15℃ through the dual mechanisms of reflection and heat insulation, thereby reducing the photoelectric efficiency degradation caused by high temperature.

[0042] In this embodiment, the protective layer 5 is a polyester film with a thickness ranging from 0.025mm to 0.075mm. Specifically, it can be 0.025mm, 0.05mm, 0.075mm, etc., with a preferred thickness of 0.05mm.

[0043] Specifically, the protective layer 5 can protect the adhesive surface of the second cotton paper double-sided adhesive layer 4 from moisture erosion and dirt contamination, thereby affecting its performance.

[0044] In this embodiment, a graphite layer 41 and / or a metal layer 42 are further provided between the second cotton paper double-sided adhesive layer 4 and the protective layer 5.

[0045] Specifically, the aforementioned metal layer can be a copper foil layer, an aluminum foil layer, etc.

[0046] Specifically, the graphite layer 41 or metal layer 42 added in this structure can play a role in heat dissipation and heat conduction, thereby reducing the temperature of the battery, improving the working efficiency of the battery cell, and extending its service life.

[0047] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-layer heat insulation buffer for solar panels, characterized in that: The device includes an MPP foam layer (1), a first cotton paper double-sided adhesive layer (2) on one side of the MPP foam layer (1), a heat insulation layer (3) on the side of the first cotton paper double-sided adhesive layer (2) away from the MPP foam layer (1), a second cotton paper double-sided adhesive layer (4) on the side of the heat insulation layer (3) away from the first cotton paper double-sided adhesive layer (2), and a protective layer (5) on the side of the second cotton paper double-sided adhesive layer (4) away from the heat insulation layer (3).

2. The multi-layer heat insulation buffer for solar panels as described in claim 1, characterized in that: The MPP foam layer (1) is flame-retardant MPP foam.

3. The multi-layer heat insulation buffer for solar panels as described in claim 1, characterized in that: The thickness of the MPP foam ranges from 0.05 to 5 mm.

4. The multi-layer heat insulation buffer for solar panels as described in claim 1, characterized in that: Both the first cotton paper double-sided adhesive layer (2) and the second cotton paper double-sided adhesive layer (4) include a cotton paper layer (21), and both sides of the cotton paper layer (21) are provided with a high-temperature resistant acrylic adhesive layer (22).

5. The multilayer heat insulation buffer for solar panels as described in claim 1, characterized in that: The thickness range of the first cotton paper double-sided adhesive layer (2) and the second cotton paper double-sided adhesive layer (4) is 0.03~0.15mm.

6. The multilayer heat insulation buffer for solar panels as described in claim 1, characterized in that: The heat insulation layer (3) includes an aerogel layer and a silver-plated polyimide film covering both sides of the aerogel layer.

7. The multilayer heat insulation buffer for solar panels as described in claim 6, characterized in that: The total thickness of the heat insulation layer (3) is 0.05~3mm, and the thickness of the silver-plated polyimide film is 12~25um, wherein the silver plating thickness of the silver-plated polyimide film is 50-100nm.

8. The multilayer heat insulation buffer for solar panels as described in claim 1, characterized in that: The protective layer (5) is a polyester film with a thickness ranging from 0.025 mm to 0.075 mm.

9. The multilayer heat insulation buffer for solar panels as described in claim 4, characterized in that: A graphite layer (41) and / or a metal layer (42) are also provided between the second cotton paper double-sided adhesive layer (4) and the protective layer (5).

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