High-reflection integrally-formed back plate for single-glass assembly and preparation method of high-reflection integrally-formed back plate

Abstract

The invention belongs to the technical field of photovoltaic backboards, and particularly relates to a high-reflection integrally-formed backboard for a single-glass assembly and a preparation method thereof.The preparation method comprises the following steps that S1, a PET film base material is provided, plasma surface treatment is conducted, then polyurethane coating is coated on the two sides to form an outer-layer weather-proof fluorine coating and an inner-layer functional coating respectively, and the outer-layer weather-proof fluorine coating and the inner-layer functional coating are formed; a CPC backboard base material is obtained; s2, white high-reflection EVA granules are fused and plasticized, a white EVA adhesive film is obtained through extrusion of a hanger type T-shaped flat die head, then the white EVA adhesive film is compounded with the inner functional coating of the CPC backboard base material, and a firm complex without a definite physical interface is obtained through rolling; s3, cooling the composite body through at least two stages of cooling rollers to obtain a coiled material; and S4, the coiled material is irradiated, and the high-reflection integrally-formed backboard is obtained.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic backsheet technology, specifically relating to a high-reflectivity integrated backsheet for single-glass modules and its preparation method. Background Technology

[0002] With the widespread adoption of high-efficiency cells such as PERC, TOPCon, and HJT, improving module power and reliability has become the core of photovoltaic technology development. Single-glass modules are widely used in PERC and BC cells due to their lightweight and cost advantages. To improve power, the industry commonly adopts a solution of using a white high-reflectivity EVA film on the back of the cell string. The structure is as follows: glass—encapsulating film—cell string—encapsulating film—backsheet. This solution uses separate backsheets and encapsulating films, raising concerns about interface reliability. The white EVA and CPC backsheet are only physically bonded during lamination through a single heating and pressurization process. The interfacial bonding strength is weaker than chemical bonding or molecular chain fusion, representing a major potential risk point for module delamination. Furthermore, the added step of material preparation before module lamination (white EVA cutting and laying) affects production efficiency and poses a risk of module defects due to misalignment, wrinkles, or contamination.

[0003] While there are unibody backplates in the industry, their product design introduces two new weak interfaces: the backplate / functional layer and the functional interface / reflective layer interface. Under the stress of harsh environments such as long-term damp heat and thermal cycling, the bonding failure of any interface will lead to overall delamination, and the risk to system reliability has not been fundamentally eliminated.

[0004] Therefore, overcoming the defect of weak bonding between the backsheet and the encapsulant film in existing photovoltaic modules is a technical problem that urgently needs to be solved in this field.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0006] This disclosure provides at least one embodiment of a high-reflectivity integrally molded backplate for single-glass modules and a method for preparing the same.

[0007] In a first aspect, embodiments of this disclosure provide a method for preparing a high-reflectivity integrally molded backsheet for a single-glass module, comprising the following steps: S1, providing a PET film substrate, performing plasma surface treatment, and then coating both sides with polyurethane coating to form an outer weather-resistant fluorine coating and an inner functional coating, respectively, to obtain a CPC backsheet substrate; S2, melting and plasticizing white high-reflectivity EVA granules, extruding them through a coat hanger-type T-die to obtain a white EVA film, and then combining it with the inner functional coating of the CPC backsheet substrate, and rolling to obtain a robust composite without a clear physical interface; S3, cooling the composite through at least two stages of cooling rollers to obtain a roll material; S4, irradiating the roll material to obtain a high-reflectivity integrally molded backsheet.

[0008] In one optional embodiment, the outer weather-resistant fluorine coating and the inner functional coating in S1 are cured by gradient temperature increase, which includes a first stage of 80-150°C, a second stage of 160-180°C, and a third stage of 60-120°C.

[0009] In one optional embodiment, the corona power of the plasma surface treatment is 2 to 6 kW;

[0010] The polyurethane coating is applied using either gravure coating or slot extrusion coating.

[0011] In an optional embodiment, the white high-reflectivity EVA granules in S2 comprise, by weight, the following components: 100 parts ethylene-vinyl acetate copolymer, 0.5-5 parts crosslinking agent, 0.3-5 parts co-crosslinking agent, 0.1-3 parts antioxidant, 0.1-3 parts light stabilizer, 0.1-3 parts coupling agent, and 5-30 parts white filler; wherein the crosslinking agent comprises any one of dicumyl peroxide and tert-butyl peroxide-2-ethylhexyl carbonate; the co-crosslinking agent comprises any one of triallyl isocyanurate and trimethylolpropane triacrylate; the antioxidant comprises any one of hindered phenols and phosphites; the light stabilizer comprises hindered amine light stabilizers; the coupling agent comprises any one of γ-methacryloyloxypropyltrimethoxysilane and vinyltrimethoxysilane; and the white filler comprises titanium dioxide.

[0012] In one optional embodiment, the white high-reflectivity EVA granules are melt-plasticized at a temperature of 80–100°C, extruded at a temperature of 50–60°C, and extruded with a basis weight of 150–400 g / m³. 2 .

[0013] In one optional embodiment, the white EVA film in S2 is laminated with the CPC backing substrate within 3 seconds of contact with air after extrusion; the rolling temperature is 60-100°C and the rolling pressure is 0.2MPa-0.8MPa.

[0014] In one optional embodiment, the cooling roller cooling in S3 includes primary cooling and secondary cooling; the temperature of the primary cooling is 40-60°C, for preliminary shaping and cooling; the temperature of the secondary cooling is 15-30°C, for final cooling and shaping.

[0015] In one optional embodiment, the irradiation in S4 adopts a full penetration mode, the irradiation dose is 3-5 KGy, and the linear velocity is 5-25 m / min; and after irradiation, the interlayer peel force between the white EVA film of the high-reflectivity integrally molded backing plate and the backing plate is ≥2 N / cm, and the pre-crosslinking degree is 20%-60%.

[0016] Secondly, this disclosure also provides a high-reflectivity integrally molded backsheet for a single-glass module, comprising a white EVA film, an inner functional coating, a PET film substrate, and an outer weather-resistant fluorine coating stacked sequentially.

[0017] Thirdly, this disclosure also provides a single-glass module that uses the high-reflectivity integrally molded backsheet as described above.

[0018] The beneficial effects of this invention are that the high-reflectivity integrated backsheet for single-glass modules and its preparation method simultaneously complete the production of the CPC backsheet and the lamination of the white high-reflectivity EVA layer on a continuous production line, achieving integrated "coating-filming-lamination" and exhibiting high process integration. Furthermore, compared to integrated backsheets produced by co-extrusion film deposition, this innovative process fuses the high-reflectivity layer and the high-performance backsheet substrate into a composite during the material manufacturing stage, fundamentally eliminating the risk of delamination between the backsheet and the high-reflectivity layer, and significantly improving the long-term reliability of the module. It also achieves optimal optical coupling between the high-reflectivity layer and the backsheet substrate, maximizing light reflection efficiency and increasing module power output.

[0019] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a high-reflectivity integrally molded backplate provided in an embodiment of this disclosure.

[0023] In the picture:

[0024] 1. White EVA film; 2. Inner functional coating; 3. PET film substrate; 4. Outer weather-resistant fluorine coating. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0027] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0028] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] This disclosure provides a method for preparing a high-reflectivity integrally molded backsheet for a single-glass module, comprising the following steps: S1, providing a PET film substrate, performing plasma surface treatment, and then coating both sides with polyurethane coating to form an outer weather-resistant fluorine coating and an inner functional coating, respectively, to obtain a CPC backsheet substrate; S2, melting and plasticizing white high-reflectivity EVA granules, extruding them through a coat hanger-type T-die to obtain a white EVA film, and then combining it with the inner functional coating of the CPC backsheet substrate, and rolling to obtain a strong composite without a clear physical interface; S3, cooling the composite through at least two stages of cooling rollers to obtain a roll material; S4, irradiating the roll material to obtain a high-reflectivity integrally molded backsheet.

[0032] In some embodiments, specifically, the outer weather-resistant fluorine coating and the inner functional coating in S1 are cured by gradient temperature rise. The gradient temperature rise curing includes a first stage of 80-150℃, a second stage of 160-180℃, and a third stage of 60-120℃. The oven has a total of 12-15 sections, which can be divided into three sections: the first section has 1-5 sections, the second section has 6-11 sections, and the third section has 12-15 sections, which can be adjusted by the user.

[0033] In some embodiments, specifically, the corona power of the plasma surface treatment is 2 to 6 kW; the coating process of the polyurethane coating is microgravure coating or slot extrusion coating.

[0034] In some embodiments, specifically, the white high-reflectivity EVA granules in S2 comprise the following components by mass parts: 100 parts of ethylene-vinyl acetate copolymer, 0.5-5 parts of crosslinking agent, 0.3-5 parts of co-crosslinking agent, 0.1-3 parts of antioxidant, 0.1-3 parts of light stabilizer, 0.1-3 parts of coupling agent, and 5-30 parts of white filler; wherein, the crosslinking agent comprises any one of dicumyl peroxide and tert-butyl peroxide-2-ethylhexyl carbonate; the co-crosslinking agent comprises any one of triallyl isocyanurate and trimethylolpropane triacrylate; the antioxidant comprises any one of hindered phenols and phosphites; the light stabilizer comprises hindered amine light stabilizers; the coupling agent comprises any one of γ-methacryloyloxypropyltrimethoxysilane and vinyltrimethoxysilane; and the white filler comprises titanium dioxide.

[0035] Specifically, the inner functional coating is not limited to ordinary adhesive coatings, but can be replaced with coatings with specific functions, such as coatings containing UV absorbers, anti-hydrolysis agents or thermally conductive fillers, to give the final backsheet additional UV resistance, moisture resistance or heat dissipation properties.

[0036] Specifically, the white EVA film is not limited to a pure EVA system. It can be a blend of EVA and POE (EPE), or a white film with POE as the matrix, in order to further improve the product's anti-PID performance and weather resistance.

[0037] In some embodiments, specifically, the white high-reflectivity EVA granules are melt-plasticized at a temperature of 80–100°C, extruded at a temperature of 50–60°C, and extruded at a basis weight of 150–400 g / m³. 2 .

[0038] In some embodiments, specifically, the white EVA film in S2 is composited with the CPC backing substrate within 3 seconds of contact with air after extrusion. The molten white EVA diffuses, entangles, and bonds with the inner functional coating of the CPC backing at the molecular chain level, forming a strong composite without a clear physical interface. The rolling temperature is 60-100°C, and the rolling pressure is 0.2MPa-0.8MPa.

[0039] In some embodiments, specifically, the cooling roller cooling in S3 includes primary cooling and secondary cooling; the temperature of the primary cooling is 40-60°C, for preliminary shaping and cooling; the temperature of the secondary cooling is 15-30°C, for final cooling and shaping.

[0040] In some embodiments, specifically, the irradiation in S4 adopts a full penetration mode, the irradiation dose is 3-5 KGy, and the linear velocity is 5-25 m / min; and after irradiation, the interlayer peel force between the white EVA film of the high-reflectivity integrally molded backing plate and the backing plate is ≥2 N / cm, and the pre-crosslinking degree is 20%-60%.

[0041] Please see Figure 1 ,like Figure 1 As shown, this disclosure also provides a high-reflectivity integrally molded backsheet for a single-glass module, comprising a white EVA film, an inner functional coating, a PET film substrate, and an outer weather-resistant fluorine coating stacked sequentially.

[0042] This disclosure also provides a single-glass module that uses the high-reflectivity integrally molded backsheet as described above.

[0043] Example 1

[0044] This embodiment provides a method for preparing a high-reflection integrally molded backsheet for a single-glass module, the specific steps of which are as follows:

[0045] Substrate preparation: PET film with a thickness of 288μm is selected as the substrate and its double sides are subjected to online plasma treatment to make its surface strength reach more than 30dy / cm.

[0046] CPC coating:

[0047] On one side of the treated PET, a polyurethane coating is applied using a microgravure coating method, with a wet film thickness of 25μm. Then, it enters a three-stage gradient curing oven with temperatures set at 80℃, 90℃, 100℃, 120℃, 140℃, 160℃, 180℃, 180℃, 180℃, 150℃, 130℃, 110℃, 90℃, and 60℃, respectively, for a total curing time of 180 seconds, forming an outer weather-resistant layer (C1).

[0048] On the other side of the PET, a polyurethane functional coating is coated with a wet film thickness of 20μm. Then, it enters a three-stage gradient curing oven with temperatures set at 80℃, 90℃, 100℃, 120℃, 140℃, 160℃, 180℃, 180℃, 180℃, 150℃, 130℃, 110℃, 90℃, and 60℃, respectively, for a total curing time of 160 seconds, forming an inner functional coating (C2) to obtain the CPC backsheet substrate.

[0049] White high-reflectivity EVA coating composite:

[0050] The CPC backsheet substrate is unwound at a speed of 10 meters per minute, with its functional coating (C2) facing upwards.

[0051] The pre-mixed white high-reflectivity EVA granules (VA content 28%, melt index 25g / 10min, titanium dioxide content 22wt%) are fed into a single screw extruder.

[0052] Key process parameters: Extruder barrel temperatures are set as follows: Zone 1 70℃, Zone 2 70℃, Zone 3 75℃, Zone 4 80℃, Zone 5 90℃, Zone 6 90℃, Zone 7 90℃, Zone 8 90℃, Zone 9 90℃. T-die temperature is set to 90℃. The temperature of the extruded molten EVA film is approximately 85℃.

[0053] Online hot-press lamination: Within 2 seconds of extrusion, the molten EVA film is guided to the surface of the C2 layer of the CPC backing plate traveling below, and immediately passed through a pair of heated metal rollers. The upper roller temperature is 85℃, the lower roller temperature is 80℃, and the linear pressure is 50N / cm.

[0054] Cooling and shaping: The composite material is sequentially cooled through two sets of cooling rollers. The surface temperature of the first cooling roller is controlled at 50℃, and the surface temperature of the second cooling roller is controlled at 20℃.

[0055] Post-processing: After cooling and shaping, the product undergoes online thickness measurement and appearance inspection, followed by slitting and winding to obtain the finished high-reflectivity one-piece molded back panel. The thickness of the white EVA layer was measured to be 200μm.

[0056] Performance testing:

[0057] Initial peel strength (between white EVA layer and CPC backing substrate): tested according to GB / T 2790 standard, the strength is 128 N / cm.

[0058] Peel strength after damp heat aging: The sample was aged in a constant temperature and humidity chamber (DH) at 85℃ / 85% relative humidity for 1000 hours. After removal, the peel strength was tested and found to be 115 N / cm, with a strength retention rate of 89.8%.

[0059] Module reliability: Single-glass modules made using this backsheet passed the DH1000 and TC600 tests in the IEC 61215 series, and the EL images showed no delamination or bubble defects.

[0060] Example 2

[0061] The difference between this embodiment and Embodiment 1 is that the process parameters of the coating composite section are adjusted to demonstrate the tolerance of the process window and the optimization effect.

[0062] Process parameter adjustment:

[0063] The extruder die temperature was increased to 95°C.

[0064] The temperature of the upper roll of the composite roll is increased to 95℃, and the linear pressure is increased to 65N / cm.

[0065] The temperature of the first cooling roller is adjusted to 45℃.

[0066] Performance testing:

[0067] Initial peel strength: increased to 135 N / cm.

[0068] Peel strength after DH1000: 122 N / cm, with a strength retention rate of 90.4%.

[0069] The components undergo the same reliability testing, without stratification.

[0070] Comparative Example 1

[0071] This comparative example uses the industry-standard "two-step method" to prepare functionally similar high-reflectivity backsheets in order to compare differences in interface reliability.

[0072] Preparation method:

[0073] The same CPC backplane substrate as in Example 1 was used.

[0074] Step 1: Apply a layer of special adhesive (acrylate-based) with a thickness of about 10μm to the functional coating (C2) of the CPC backsheet using a coating process, and then cure it to form an independent adhesive layer.

[0075] Step 2: The white high-reflectivity EVA film with a thickness of 200μm, which was prepared in advance by casting method (the formula is the same as in the example), is pressed onto the CPC backing plate with the adhesive layer at 120°C and 40N / cm using a thermal laminating machine.

[0076] Performance testing:

[0077] Initial peel strength: 85 N / cm. The interface failure mode was interfacial delamination between the white EVA film and the adhesive layer.

[0078] Peel strength after damp heat aging (DH1000): drops sharply to 38 N / cm, with a strength retention rate of only 44.7%. Observation of the cross-section reveals obvious and complete interface separation.

[0079] Component reliability: After testing with TC400 (400 thermal cycles), the EL image of the component made using this backsheet showed local dark spots at the corners, indicating that delamination had begun between the backsheet and the EVA reflective layer, resulting in poor contact.

[0080] Comparison of experimental data and conclusions

[0081]

[0082]

[0083] Specifically, this invention overcomes the shortcomings of insufficient bonding strength at the backplate / functional layer and functional interface / reflective layer interfaces by preparing a robust composite without a clear physical interface during the material manufacturing stage.

[0084] Specifically, in existing technologies, products with composite fluorine films on the air surface are compared to this invention, which reduces the number of steps by using only a coating process without a composite process. Existing technologies have strict requirements for backplane surface treatment, requiring high-energy corona treatment or flame treatment. It is difficult to maintain the consistency of such treatment effects, and the treated surface has a time-dependent effect, posing a challenge to continuous and stable production and resulting in a narrow process window. This invention also overcomes the above-mentioned defects.

[0085] In summary, this high-reflection integrated backsheet for single-glass modules and its preparation method simultaneously complete the production of the CPC backsheet and the lamination of the white high-reflection EVA layer on a continuous production line, achieving integrated "coating-filming-lamination" and demonstrating high process integration. Furthermore, compared to integrated backsheets produced by co-extrusion film deposition, this innovative process fuses the high-reflection layer and the high-performance backsheet substrate into a composite during the material manufacturing stage, fundamentally eliminating the risk of delamination between the backsheet and the high-reflection layer, and significantly improving the long-term reliability of the module. It also achieves optimal optical coupling between the high-reflection layer and the backsheet substrate, maximizing light reflection efficiency and increasing module power output.

[0086] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A method for preparing a high-reflectivity integrally molded backsheet for a single-glass module, characterized in that, Includes the following steps: S1, a PET film substrate is provided, which undergoes plasma surface treatment, and then polyurethane coating is applied to both sides to form an outer weather-resistant fluorine coating and an inner functional coating, respectively, to obtain a CPC backsheet substrate. S2, white high-reflectivity EVA granules are melted and plasticized, and extruded through a coat hanger-type T-shaped flat die to obtain a white EVA film, which is then compounded with the inner functional coating of the CPC backing substrate and rolled to obtain a strong composite without a clear physical interface; S3, the composite is cooled by at least two stages of cooling rollers to obtain a roll material; S4, irradiate the roll material to obtain a high-reflectivity one-piece molded back panel.

2. The preparation method according to claim 1, characterized in that, The outer weather-resistant fluorine coating and the inner functional coating in S1 are cured by gradient temperature increase, which includes a first stage of 80-150℃, a second stage of 160-180℃, and a third stage of 60-120℃.

3. The preparation method according to claim 1, characterized in that, The corona power of the plasma surface treatment is 2-6 kW; The polyurethane coating is applied using either gravure coating or slot extrusion coating.

4. The preparation method according to claim 1, characterized in that, The white high-reflectivity EVA granules in S2 comprise the following components by mass parts: The composition includes 100 parts of ethylene-vinyl acetate copolymer, 0.5-5 parts of crosslinking agent, 0.3-5 parts of co-crosslinking agent, 0.1-3 parts of antioxidant, 0.1-3 parts of light stabilizer, 0.1-3 parts of coupling agent, and 5-30 parts of white filler; wherein, The crosslinking agent includes any one of dicumyl peroxide and tert-butyl peroxide-2-ethylhexyl carbonate. The co-crosslinking agent includes any one of triallyl isocyanurate and trimethylolpropane triacrylate; The antioxidants include any one of hindered phenols and phosphites; The light stabilizer includes hindered amine light stabilizers; The coupling agent includes any one of γ-methacryloxypropyltrimethoxysilane and vinyltrimethoxysilane; The white filler includes titanium dioxide.

5. The preparation method according to claim 1, characterized in that, The white, high-reflectivity EVA granules are melt-plasticized at a temperature of 80–100°C, extruded at a temperature of 50–60°C, and extruded with a basis weight of 150–400 g / m³. 2 .

6. The preparation method according to claim 1, characterized in that, The white EVA film in S2 is laminated with the CPC backing substrate within 3 seconds of contact with air after extrusion. The rolling temperature is 60-100℃, and the rolling pressure is 0.2MPa-0.8MPa.

7. The preparation method according to claim 1, characterized in that, The cooling roller cooling in S3 includes primary cooling and secondary cooling; The temperature of the first-stage cooling is 40-60℃, which is used for preliminary shaping and cooling. The secondary cooling temperature is 15–30°C, used for final cooling and shaping.

8. The preparation method according to claim 1, characterized in that, The irradiation in S4 adopts a full penetration mode, with an irradiation dose of 3-15 KGy and a linear velocity of 5-25 m / min; Furthermore, after irradiation, the white EVA film of the high-reflectivity integrally molded backsheet has an interlayer peel force ≥2N / cm with the backsheet, and the pre-crosslinking degree is 20%~60%.

9. A high-reflectivity integrally molded backsheet for single-glass modules, characterized in that, It includes a white EVA film, an inner functional coating, a PET film substrate, and an outer weather-resistant fluorine coating, which are stacked in sequence.

10. A single-glass module, characterized in that, The high-reflectivity one-piece molded backplate as described in claim 9 is used.

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