A low-weight battery encapsulation film and a photovoltaic cell module with the encapsulation film.

Abstract

This application relates to the technical field of photovoltaic cell encapsulation materials, specifically disclosing a low-weight cell encapsulation film and a photovoltaic cell module with the film. The low-weight cell encapsulation film includes a POE layer and an EVA layer, wherein the basis weight of the low-weight cell encapsulation film is ≤360g / m², and the basis weight of the POE layer is ≥60g / m²; a photovoltaic cell module includes the aforementioned low-weight cell encapsulation film. The low-weight cell encapsulation film of this application has the advantages of low film basis weight, meeting the lightweight requirements of photovoltaic modules while reducing the generation of air bubbles; furthermore, the photovoltaic cell module of this application has the advantages of meeting the requirements of lightweight modules and being bubble-free.

Description

Technical Field

[0001] This application relates to the technical field of photovoltaic cell encapsulation materials, and more specifically, it relates to a low-weight cell encapsulation film and a photovoltaic cell module with the film. Background Technology

[0002] Solar photovoltaic modules encapsulate the cell array in a double-layer glass plate or between a glass plate and a backsheet using an encapsulating film. With the development of lightweight products, the overall thickness of photovoltaic cell modules is becoming thinner and lighter, which also puts higher demands on the lightweight encapsulating film.

[0003] There is currently a photovoltaic cell module that includes EVA film.

[0004] Regarding the aforementioned related technologies, the inventors discovered that the encapsulant film basis weight of photovoltaic cell modules in these technologies is approximately 450-560 g / m³. 2 The encapsulant film has a large basis weight, which cannot meet the needs of the module. After reducing the basis weight of the encapsulant film, there are air bubbles between the encapsulant film and the glass plate or back sheet. Therefore, the development of a low basis weight photovoltaic cell encapsulant film that does not produce air bubbles has broad application prospects. Summary of the Invention

[0005] In order to reduce the basis weight of the encapsulant film while reducing the phenomenon of bubble formation, this application provides a low basis weight battery encapsulant film and a photovoltaic cell module with the encapsulant film.

[0006] In a first aspect, this application provides a low-weight battery encapsulation film, employing the following technical solution: A low-basis-weight battery encapsulation film includes a POE layer and an EVA layer, wherein the basis weight of the low-basis-weight battery encapsulation film is ≤ 360 g / m³. 2 And the basis weight of the POE layer is ≥60g / m³ 2 .

[0007] By adopting the above technical solution, a POE layer, which is lighter than the EVA layer, is used in conjunction with the EVA layer to reduce the overall weight of the encapsulant film. The adhesive strength of the encapsulant film prepared in this application is tested, and its adhesive strength with the glass plate is 121-130 N / cm, which meets the current requirements for photovoltaic module encapsulant films. Moreover, there is no delamination or bubbles. This shows that the encapsulant film prepared in this application can meet the requirements of lightweight modules while reducing the generation of bubbles, and has a lower encapsulant film weight.

[0008] Preferably, the POE layer contains grafted POE resin.

[0009] By employing the above technical solutions, small molecule additives are often added to the POE layer to improve its adhesive strength, crosslinking degree, and other properties. However, these additives have poor compatibility in the non-polar POE layer and tend to migrate outwards, reducing the interlayer bonding force between the POE layer and the EVA layer.

[0010] When grafted POE resin is used, the compatibility of the additives within the POE layer is improved by grafting the additives onto the POE chain, thereby reducing the amount of additive migration and facilitating higher crosslinking during lamination. At the same time, a three-dimensional and more stable crosslinked structure is formed, which improves the mechanical properties of the POE layer and enhances the interlayer bonding force between the POE layer and the EVA layer.

[0011] The adhesive film prepared in this application was subjected to performance tests. Its adhesion strength to the glass plate increased to 134 / cm, and it showed no delamination or bubbles, indicating that the adhesive film prepared in this application has better adhesion strength. No adhesive film residue was found on the glass plate, indicating good interlayer bonding between the POE layer and the EVA layer. Furthermore, the damp heat yellowing index decreased by 8.8%, indicating better resistance to damp heat aging in the POE layer, better mechanical properties of the adhesive film, and no delamination or bubbles.

[0012] Preferably, the grafting material of the grafted POE resin is a mixture of one or more of acrylate monomers, unsaturated acid monomers, acrylamide monomers, and silane compounds.

[0013] By adopting the above technical solution, the additives include acrylate monomers, unsaturated acid monomers, acrylamide monomers, and silane compounds that can participate in the crosslinking reaction of POE resin, which improves the interlayer bonding force between the POE layer and the EVA layer, and the prepared film is free of delamination and bubbles.

[0014] Preferably, the POE layer comprises an olefin polymer containing double bonds.

[0015] By adopting the above technical solution, the adhesive film prepared in this application was subjected to performance testing. Its adhesion strength to the glass plate was further improved to 138 N / cm, and the damp heat yellowing index was further reduced by 0.24, indicating that the adhesive film has high adhesion strength and good resistance to damp heat aging. This may be because, on the one hand, olefin polymers can be used as fillers to improve the mechanical properties of the POE layer; on the other hand, the density of crosslinking points in the POE layer is increased, forming a denser three-dimensional mesh-like crosslinking structure, which improves the degree of crosslinking of the POE layer. Furthermore, the prepared adhesive film is free of delamination and bubbles.

[0016] Preferably, at least one side of the POE layer is provided with an EVA layer.

[0017] By adopting the above technical solution, the EVA layer has good adhesive strength and plays an adhesive role, ensuring the adhesive strength between the film and the glass plate and the battery array.

[0018] Preferably, an EVA layer is provided on one side of the POE layer.

[0019] More preferably, the POE layer has an EVA layer on the side facing the battery array.

[0020] By adopting the above technical solution, the bonding strength between the POE layer and the battery array is improved, and the occurrence of separation between the battery array and the adhesive film is reduced.

[0021] Preferably, an EVA layer is provided on both sides of the POE layer.

[0022] By adopting the above technical solution, the POE layer is bonded to the glass plate and the battery array through the EVA layers on both sides, respectively.

[0023] Secondly, this application provides a photovoltaic cell module, which adopts the following technical solution: A photovoltaic cell module comprising the low-weight cell encapsulation film as described in any one of claims 1-8.

[0024] By adopting the above technical solution and using the aforementioned encapsulating film in photovoltaic cell modules, the total basis weight of the encapsulating film is ≤360g / m³. 2 This allows the battery assembly to have a lower basis weight, meeting the requirements for lightweight battery assembly, while ensuring that the film is free of delamination and bubbles. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the embodiments. Unless otherwise specified below, all raw materials used in the various embodiments of this application are commercially available: The EVA resin manufacturer is Sirbon Petrochemical, model V2825; The POE resin manufacturer is LG of South Korea, model number LF675; Silane coupling agent, manufactured by Shandong Huanzheng Chemical Co., Ltd., model KH-550; Methyl methacrylate, manufactured by Aite (Shandong) New Materials Co., Ltd., with a purity of 99%; Vinylsilane oligomer VP10, manufactured by Guangzhou Longkai Chemical Co., Ltd., model KH-VP10; EPDM, manufactured by Exxon Corporation of the United States, model M1705.

[0026] Performance testing The low-weight battery encapsulation films prepared in the examples and comparative examples were tested as follows.

[0027] Test 1: Adhesive strength test between adhesive film and glass plate: The test was conducted according to GB / T 2790-1995 "Test method for peel strength of adhesives at 180°".

[0028] Test 2: Visual inspection (first visual inspection), check for air bubbles between the adhesive film and the glass plate.

[0029] Test 3: Damp heat aging resistance test: The test was conducted according to the provisions of IEC 61215-2:2016 "Test contents for terrestrial photovoltaic modules" 4.13. The test process is as follows: a) Place all samples in a high temperature and high humidity aging test chamber. Test conditions: temperature 85℃±2℃, relative humidity 85%±5%; b) Test time: 1000h; c) After the test, take out the sample and let it recover in an open environment at 23℃±5℃ and relative humidity less than 75% for 2h to 4h. Then, perform a visual inspection (second visual inspection) to ensure that there are no appearance defects such as delamination. d) The yellowness index YI of the laminated specimens before and after the test shall be measured according to ASTM E313-2010. At least 3 points shall be measured for each specimen. The yellowness index YI of the specimen shall be the average value of the measured points. The difference between the yellowness index YI after aging and the yellowness index YI before aging shall be recorded, which is the damp heat yellowing index ΔYI.

[0030] Experiment 4: After testing according to Experiment 1, conduct a visual inspection (third visual inspection) to observe whether there is residual adhesive film on the glass plate on the POE layer side after the adhesive film separates from the glass plate. If there is residue, it indicates that the interlayer bonding force between the EVA layer and the POE layer is insufficient; if there is no residue, it indicates that the interlayer bonding force between the EVA layer and the POE layer is high.

[0031] Experiment 5: Detect the defect rate of the products. After production, observe whether there are air bubbles between the adhesive film and the solar panel. The presence of air bubbles indicates a defect. Record the number of defective products and calculate the proportion of defective products to the total number of inspected products. This is the defect rate. The lower the defect rate, the less likely the prepared adhesive film is to produce air bubbles. Example

[0032] Example 1 A low-weight battery encapsulation film is prepared by the following steps: S1. Mix 100 kg of POE resin, 1 kg of 1,1-di-tert-butylperoxide-3,3,5-trimethylcyclohexane, 1.5 kg of triallyl isocyanate, 0.5 kg of 2,2-thiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.1 kg of bis-2,2,6,6-tetramethylpiperidinol sebacate, and 0.1 kg of 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole to obtain mixture A; S2. Mix 100 kg of EVA resin, 1 kg of 1,1-di-tert-pentylcyclohexane peroxide, 1 kg of triallyl cyanurate, 0.5 kg of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester, 0.1 kg of bis-2,2,6,6-tetramethylpiperidinol sebacate and 0.1 kg of 2-hydroxy-4-n-octyloxybenzophenone to obtain mixture B; S3. Add mixture A and mixture B into their respective hoppers, and melt co-extrude them at 80°C at an extrusion speed of 20 m / min. Cast and cool to form a film. The film structure consists of a POE layer and an EVA layer, with a total film basis weight of 360 g / m³. 2 The basis weight of the POE layer is 60 g / m². 2 The EVA layer has a basis weight of 300g / m³. 2 .

[0033] Examples 2-5 A low-weight battery encapsulation film differs from Example 1 in that the EVA layer has a different basis weight, as shown in Table 1.

[0034] Examples 6-10 A battery encapsulation film differs from Example 1 in that the basis weight of the EVA layer and the basis weight of the POE layer are different, as shown in Table 1.

[0035] Comparative Example 1 A battery encapsulation film differs from Example 1 in that the basis weight of the EVA layer is different, the basis weight of the POE layer is different, and the total basis weight of the film is greater than 360 g / m³. 2 The details are shown in Table 1.

[0036] Comparative Example 2 A battery encapsulation film differs from Example 1 in that the basis weight of the EVA layer and the basis weight of the POE layer are different, as shown in Table 1.

[0037] The encapsulating films prepared in Examples 1-10 and Comparative Examples 1-2 were subjected to performance tests, and the test results are shown in Table 1: Table 1 Performance test results of Examples 1-10 and Comparative Examples 1-2 The difference between Examples 2-5 and Example 1 is that the basis weight of the EVA layer is less than 300 g / m³. 2 ; The difference between Examples 6-10 and Example 1 is that the basis weight of the POE layer is greater than 60 g / m². 2 ; The difference between Comparative Example 1 and Example 1 is that the total basis weight of the film is 500 g / m³. 2 The total basis weight of the film in Example 1 is 360 g / m³. 2 ; The difference between Comparative Example 2 and Example 1 is that the EVA layer basis weight is greater than 300 g / m³. 2 POE layer basis weight less than 60g / m 2 .

[0038] As shown in Table 1, in Examples 1-10 of this application, by controlling the basis weight of the EVA layer and POE layer within an appropriate range, the basis weight of the resulting film is ≤360g / m³. 2 The bonding strength reaches 121-130 N / cm, meeting the usage requirements, and there are no bubbles or delamination, with a defect rate of only 0.4-0.5%. This shows that the encapsulant film of this application can meet the requirements of lightweight photovoltaic modules while reducing the occurrence of bubble problems, and has a low total weight of encapsulant film.

[0039] The preferred basis weights of each layer in the film preparation are as follows: POE layer basis weight is 160 g / m². 2 The EVA layer has a basis weight of 200g / m³. 2 .

[0040] Compared to Example 1, Comparative Example 2 used materials with a weight of less than 60 g / m³. 2 The POE layer, although the total basis weight of the film reaches 360g / m² 2 The film weight is the same as that in Example 1, but its adhesive strength is only 112 N / cm, which is lower than 130 N / cm in Example 1. Moreover, the defect rate of the film is as high as 5%, indicating that there are many films with air bubble problems, which cannot meet the needs of the components well.

[0041] Example 11 A low-weight battery encapsulation film, the preparation method of which is as follows: S1. Mix 100 kg of grafted POE resin, 2 kg of 2-ethylhexyl carbonate tert-butyl peroxide, 2 kg of triallyl cyanurate, 0.6 kg of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.2 kg of 2,4,6-trichloro-1,3,5-triazine and 0.2 kg of 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole to obtain mixture C; The grafted POE resin is obtained by mixing POE resin, acrylate monomers and dicumyl peroxide in a weight ratio of 100:2:3, wherein the acrylate monomers are methyl methacrylate.

[0042] S2. Same as step S2 in Example 1, to obtain mixture B; S3. Mixture C and mixture B are co-extruded at 100℃ at an extrusion speed of 20m / min, then cast and cooled to form a film. The film structure is a POE layer / EVA layer, and the total basis weight of the film is 360g / m³. 2 The basis weight of the POE layer is 60 g / m². 2 The EVA layer has a basis weight of 300g / m³. 2 .

[0043] The performance of the encapsulating films prepared in Examples 1 and 11 was tested, and the results are shown in Table 2. Table 2 Performance test results of Examples 1 and 11 As shown in Table 2, in Example 11, due to the use of an equal amount of grafted POE resin instead of POE resin, the adhesion strength between the film and the glass plate was 134 N / cm, which was higher than the adhesion strength of 130 N / cm in Example 1. The damp heat yellowing index in Example 11 was 1.76, which was lower than that in Example 1. This indicates that the adhesive film prepared in Example 11 has sufficient adhesion strength to meet the application requirements and exhibits good resistance to yellowing. The absence of residue on the glass plate indicates improved interlayer bonding between the POE layer and the EVA layer. Furthermore, the defect rate decreased from 0.4% to 0.2%, reducing the occurrence of air bubbles in the adhesive film. The prepared adhesive film was free of delamination and air bubbles.

[0044] Example 12 A low-weight battery encapsulation film differs from Example 11 in that the POE layer is used differently, with an equal amount of silane compounds replacing methyl methacrylate. Among them, the silane compound is vinylsilane oligomer VP10.

[0045] Example 13 A low-weight battery encapsulation film differs from Example 11 in that the POE layer is used differently, with an equal amount of a mixture of methacrylate and vinyl silane oligomer VP10 used instead of methyl methacrylate. In this mixture, methacrylate and vinyl silane oligomer VP10 are mixed in a weight ratio of 1:1.

[0046] Example 14 A low-weight battery encapsulation film, the preparation method of which is as follows: S1. Mix 100 kg of grafted POE resin, 50 kg of olefin polymer containing double bonds, 2 kg of ethyl 3,3-di(tert-butylperoxy)butyrate, 2 kg of triallyl cyanurate, 0.6 kg of octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 0.2 kg of bis(1,2,2,6,6-pentamethyl-4-piperidine) sebacate and 0.2 kg of 2-hydroxy-4-n-octyloxybenzophenone to obtain mixture D; The grafted POE resin is obtained by mixing POE resin, acrylate and dicumyl peroxide in a weight ratio of 100:2:3, and the acrylate is methyl methacrylate. EPDM is an olefin polymer containing double bonds; S2 is the same as step S2 in Example 11, resulting in mixture B; S3. Mixtures D and B are co-extruded at 100℃ at an extrusion speed of 20m / min, then cast and cooled to form a film. The film structure is a POE layer / EVA layer, and the total basis weight of the film is 360g / m³. 2 The basis weight of the POE layer is 60 g / m². 2 The EVA layer has a basis weight of 300g / m³. 2 .

[0047] The encapsulating films prepared in Examples 12-14 were subjected to performance tests, and the test results are shown in Table 3.

[0048] Table 3 Performance test results of Examples 11-14 As shown in Table 3, the adhesive films prepared in Examples 11-13 exhibited minimal differences in adhesion strength and damp-heat yellowing index with the glass plate. Furthermore, all films showed no obvious delamination or bubbles, and no residue remained on the glass plate. This indicates that when the grafting material for the POE resin is an acrylate monomer, a silane compound, or a mixture of acrylate and silane compounds, the adhesive film exhibits better aging resistance, exhibiting no delamination or bubbles.

[0049] Furthermore, the effects of unsaturated acid monomers and acrylamide monomers are analogous to those of acrylate monomers, silane compounds, and mixtures of acrylate monomers and silane compounds. This indicates that when the grafting material for grafted POE resin is a mixture of one or more of acrylate monomers, unsaturated acid monomers, acrylamide monomers, and silane compounds, the film can exhibit better aging resistance, with no delamination or bubbles.

[0050] The reason for this may be that grafting acrylate monomers, unsaturated acid monomers, acrylamide monomers, and silane compounds onto the POE resin reduces the amount of additives migrating out of the POE layer and improves the interlayer bonding between the POE layer and the EVA layer.

[0051] The difference between Example 14 and Example 11 is that EPDM is also included in step S1. As shown in Table 3, compared with Example 11, the adhesion strength between the adhesive film and the glass plate in Example 14 is increased to 138 N / cm, the damp heat yellowing index is reduced by 0.24, the prepared adhesive film is free of delamination and bubbles, there is no residue on the glass plate, and the defect rate is reduced from 0.2% to 0.1%.

[0052] This indicates that by using olefin copolymers containing double bonds, the prepared POE layer has higher adhesive strength and better aging resistance. The reason for this may be that olefin polymers containing double bonds can act as fillers to enhance the mechanical properties of the POE layer, and can also increase the crosslinking density of the POE layer, forming a denser three-dimensional network crosslinking structure, which further reduces the occurrence of air bubbles between the adhesive film and the glass plate.

[0053] Example 15 A low-basis-weight battery encapsulation film differs from Example 14 in that: EVA layers are provided on both sides of the POE layer, and the basis weight of the EVA layer on each side is different, wherein the basis weight of the EVA layer on each side is 110 g / m³. 2 .

[0054] Performance tests were conducted on Examples 12 and 15, and the results are shown in Table 4.

[0055] Table 4 Performance test results of Examples 12 and 15 The difference between Example 15 and Example 12 is that the POE layer is placed between the two EVA layers.

[0056] Compared to Example 12, although the adhesive strength between the adhesive film and the glass plate was slightly reduced and the damp heat yellowing index was slightly increased, and the adhesive film had no delamination or bubbles, the adhesive film prepared in Example 15 was still a low-weight encapsulation adhesive film with good resistance to damp heat aging, no delamination, and no bubbles compared to the adhesive film in Comparative Example 1.

[0057] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A low-weight battery encapsulation film, characterized in that, The following steps were used to prepare the following mixture: S1, 100 kg of POE resin, 1 kg of 1,1-di-tert-butylperoxide-3,3,5-trimethylcyclohexane, 1.5 kg of triallyl isocyanate, 0.5 kg of 2,2-thiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and 0.1 kg of sebacic acid bis-2,2,6,6- Tetramethylpiperidinol ester and 0.1 kg of 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole were mixed to obtain mixture A; S2. Mix 100 kg of EVA resin, 1 kg of 1,1-di-tert-pentylcyclohexane peroxide, 1 kg of triallyl cyanurate, 0.5 kg of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester, 0.1 kg of bis-2,2,6,6-tetramethylpiperidinol sebacate and 0.1 kg of 2-hydroxy-4-n-octyloxybenzophenone to obtain mixture B; S3. Add mixture A and mixture B into their respective hoppers, and melt co-extrude at 80°C at an extrusion speed of 20 m / min. Cast and cool to form a film. The film structure consists of a POE layer and an EVA layer, with a total basis weight of 360 g / m³. 2 The basis weight of the POE layer is 60 g / m². 2 The EVA layer has a basis weight of 300g / m³. 2 .

2. A low-weight battery encapsulation film, characterized in that, The following steps were taken to prepare the mixture: S1, 100 kg of POE resin, 1 kg of 1,1-di-tert-butylperoxide-3,3,5-trimethylcyclohexane, 1.5 kg of triallyl isocyanate, 0.5 kg of 2,2-thiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.1 kg of bis-2,2,6,6-tetramethylpiperidinol sebacate and 0.1 kg of 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole were mixed to obtain mixture A; S2. Mix 100 kg of EVA resin, 1 kg of 1,1-di-tert-pentylcyclohexane peroxide, 1 kg of triallyl cyanurate, 0.5 kg of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester, 0.1 kg of bis-2,2,6,6-tetramethylpiperidinol sebacate and 0.1 kg of 2-hydroxy-4-n-octyloxybenzophenone to obtain mixture B; S3. Mixture A and mixture B are respectively put into the corresponding material buckets, melt co-extruded at 80°C, the extrusion speed is 20m / min, cast and cooled to form a film, the film structure is POE layer and EVA layer; The basis weight of the POE layer is 60 g / m³. 2 The EVA layer has a basis weight of 270 g / m³. 2 Or 200g / m 2 Or 150g / m 2 Or 90g / m 2 .

3. A low-weight battery encapsulation film, characterized in that, The following steps were taken to prepare the mixture: S1, 100 kg of POE resin, 1 kg of 1,1-di-tert-butylperoxide-3,3,5-trimethylcyclohexane, 1.5 kg of triallyl isocyanate, 0.5 kg of 2,2-thiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.1 kg of bis-2,2,6,6-tetramethylpiperidinol sebacate and 0.1 kg of 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole were mixed to obtain mixture A; S2. Mix 100 kg of EVA resin, 1 kg of 1,1-di-tert-pentylcyclohexane peroxide, 1 kg of triallyl cyanurate, 0.5 kg of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester, 0.1 kg of bis-2,2,6,6-tetramethylpiperidinol sebacate and 0.1 kg of 2-hydroxy-4-n-octyloxybenzophenone to obtain mixture B; S3. Mixture A and mixture B are respectively put into the corresponding material barrels, melt co-extruded at 80°C, the extrusion speed is 20m / min, cast and cooled to form a film, the film structure is POE layer and EVA layer; The EVA layer has a basis weight of 200g / m³. 2 The basis weight of the POE layer is 80 g / m². 2 Or 100g / m 2 Or 120g / m 2 Or 140g / m 2 Or 160g / m 2 .

4. A low-weight battery encapsulation film, characterized in that, Its preparation method is as follows: S1. Mix 100 kg of grafted POE resin, 2 kg of tert-butyl peroxide-2-ethylhexyl carbonate, 2 kg of triallyl cyanurate, 0.6 kg of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.2 kg of 2,4,6-trichloro-1,3,5-triazine and 0.2 kg of 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole to obtain mixture C; The grafted POE resin is obtained by mixing POE resin, acrylate monomers and dicumyl peroxide in a weight ratio of 100:2:3, wherein the acrylate monomers are methyl methacrylate. S2. Mix 100 kg of EVA resin, 1 kg of 1,1-di-tert-pentylcyclohexane peroxide, 1 kg of triallyl cyanurate, 0.5 kg of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester, 0.1 kg of bis-2,2,6,6-tetramethylpiperidinol sebacate and 0.1 kg of 2-hydroxy-4-n-octyloxybenzophenone to obtain mixture B; S3. Mixture C and mixture B are co-extruded at 100℃ at an extrusion speed of 20m / min, then cast and cooled to form a film. The film structure is a POE layer / EVA layer, and the total basis weight of the film is 360g / m³. 2 The basis weight of the POE layer is 60 g / m². 2 The EVA layer has a basis weight of 300g / m³. 2 .

5. A low-weight battery encapsulation film, characterized in that, Its preparation method is as follows: S1. Mix 100 kg of grafted POE resin, 2 kg of 2-ethylhexyl carbonate tert-butyl peroxide, 2 kg of triallyl cyanurate, 0.6 kg of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.2 kg of 2,4,6-trichloro-1,3,5-triazine and 0.2 kg of 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole to obtain mixture C; The grafted POE resin is obtained by mixing POE resin, vinyl silane oligomer VP10 and dicumyl peroxide in a weight ratio of 100:2:

3. S2. Mix 100 kg of EVA resin, 1 kg of 1,1-di-tert-pentylcyclohexane peroxide, 1 kg of triallyl cyanurate, 0.5 kg of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester, 0.1 kg of bis-2,2,6,6-tetramethylpiperidinol sebacate and 0.1 kg of 2-hydroxy-4-n-octyloxybenzophenone to obtain mixture B; S3. Mixture C and mixture B are co-extruded at 100℃ at an extrusion speed of 20m / min, then cast and cooled to form a film. The film structure is a POE layer / EVA layer, and the total basis weight of the film is 360g / m³. 2 The basis weight of the POE layer is 60 g / m². 2 The EVA layer has a basis weight of 300g / m³. 2 .

6. A low-weight battery encapsulation film, characterized in that, Its preparation method is as follows: S1. Mix 100 kg of grafted POE resin, 2 kg of tert-butyl peroxide-2-ethylhexyl carbonate, 2 kg of triallyl cyanurate, 0.6 kg of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.2 kg of 2,4,6-trichloro-1,3,5-triazine and 0.2 kg of 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole to obtain mixture C; The grafted POE resin is obtained by mixing POE resin, methacrylate and vinyl silane oligomer VP10, and dicumyl peroxide in a weight ratio of 100:2:3; the weight ratio of methacrylate and vinyl silane oligomer VP10 is 1:

1. S2. Mix 100 kg of EVA resin, 1 kg of 1,1-di-tert-pentylcyclohexane peroxide, 1 kg of triallyl cyanurate, 0.5 kg of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester, 0.1 kg of bis-2,2,6,6-tetramethylpiperidinol sebacate and 0.1 kg of 2-hydroxy-4-n-octyloxybenzophenone to obtain mixture B; S3. Mixture C and mixture B are co-extruded at 100℃ at an extrusion speed of 20m / min, then cast and cooled to form a film. The film structure is a POE layer / EVA layer, and the total basis weight of the film is 360g / m³. 2 The basis weight of the POE layer is 60 g / m². 2 The EVA layer has a basis weight of 300g / m³. 2 .

7. A low-weight battery encapsulation film, characterized in that, Its preparation method is as follows: S1. Mix 100 kg of grafted POE resin, 50 kg of olefin polymer containing double bonds, 2 kg of ethyl 3,3-di(tert-butylperoxy)butyrate, 2 kg of triallyl cyanurate, 0.6 kg of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol, 0.2 kg of bis(1,2,2,6,6-pentamethyl-4-piperidine) sebacate and 0.2 kg of 2-hydroxy-4-n-octyloxybenzophenone to obtain mixture D; The grafted POE resin is obtained by mixing POE resin, acrylates and dicumyl peroxide in a weight ratio of 100:2:3, wherein the acrylates are methyl methacrylate; and the olefin polymer containing double bonds is EPDM. S2. Mix 100 kg of EVA resin, 1 kg of 1,1-di-tert-pentylcyclohexane peroxide, 1 kg of triallyl cyanurate, 0.5 kg of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester, 0.1 kg of bis-2,2,6,6-tetramethylpiperidinol sebacate and 0.1 kg of 2-hydroxy-4-n-octyloxybenzophenone to obtain mixture B; S3. Mixture D and mixture B are co-extruded at 100℃ at an extrusion speed of 20m / min, then cast and cooled to form a film. The film structure is a POE layer / EVA layer, and the total basis weight of the film is 360g / m³. 2 The basis weight of the POE layer is 60 g / m². 2 The EVA layer has a basis weight of 300g / m³. 2 .

8. A low-weight battery encapsulation film, characterized in that, Its preparation method is as follows: S1. Mix 100 kg of grafted POE resin, 50 kg of olefin polymer containing double bonds, 2 kg of ethyl 3,3-di(tert-butylperoxy)butyrate, 2 kg of triallyl cyanurate, 0.6 kg of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol, 0.2 kg of bis(1,2,2,6,6-pentamethyl-4-piperidine) sebacate and 0.2 kg of 2-hydroxy-4-n-octyloxybenzophenone to obtain mixture D; The grafted POE resin is obtained by mixing POE resin, acrylates and dicumyl peroxide in a weight ratio of 100:2:3, where the acrylates are methyl methacrylate; and the olefin polymer containing double bonds is EPDM. S2. Mix 100 kg of EVA resin, 1 kg of 1,1-di-tert-pentylcyclohexane peroxide, 1 kg of triallyl cyanurate, 0.5 kg of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester, 0.1 kg of bis-2,2,6,6-tetramethylpiperidinol sebacate and 0.1 kg of 2-hydroxy-4-n-octyloxybenzophenone to obtain mixture B; S3. Co-extrude mixture D and mixture B at 100℃ at an extrusion speed of 20m / min, cast and cooled to form a film. The film structure is EVA layer / POE layer / EVA layer, and the basis weight of the POE layer is 60g / m³. 2 The basis weight of a single-sided EVA layer is 110 g / m³. 2 .

9. A photovoltaic cell module, characterized in that, Includes the low-weight battery encapsulation film according to any one of claims 1-8.

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