Corrosion-resistant POE packaging adhesive film for TOPCon battery assembly and preparation method of corrosion-resistant POE packaging adhesive film

Abstract

The invention belongs to the technical field of photovoltaic packaging materials, and particularly relates to a corrosion-resistant POE packaging adhesive film for a TOPCon battery assembly and a preparation method of the corrosion-resistant POE packaging adhesive film, and the corrosion-resistant POE packaging adhesive film is prepared from the following raw materials in parts by mass: 100 parts of photovoltaic POE resin, 0.01-3 parts of an initiator, 0.01-3 parts of an assistant crosslinker, 0.01-3 parts of a silane coupling agent, 0.001-0.5 part of an antioxidant, 0.001-0.5 part of a light stabilizer and 0.1-0.5 part of a corrosion-resistant additive. Wherein the corrosion-resistant auxiliary agent is liquid potassium lactate; according to the corrosion-resistant POE packaging adhesive film for the TOPCon battery assembly and the preparation method of the corrosion-resistant POE packaging adhesive film, the problem of grid line corrosion of the assembly in a high-temperature and high-humidity environment is improved by adding the liquid potassium lactate, and meanwhile, the problems that traditional solid powder is not uniformly distributed and the light transmittance of the adhesive film is reduced after agglomeration are solved by the liquid corrosion-resistant additive; more importantly, the liquid corrosion-resistant auxiliary agent can be directly mixed and extruded with resin colloidal particles, further modification and granulation are not needed, and the production process is simplified.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic packaging materials, and specifically relates to a corrosion-resistant POE packaging film for a TOPCon battery assembly and a preparation method thereof. Background Art

[0002] Compared with P-type PERC cells, N-type TOPCon cells have gradually become the mainstream choice in the market due to their higher conversion efficiency, lower temperature coefficient and low attenuation characteristics. Many photovoltaic companies are accelerating the layout of N-type TOPCon technology and plan to further expand production capacity in the next few years. According to the forecast of third-party agency InfoLink, the market share of TOPCon cells will reach 65% in 2024. Photovoltaic encapsulation film plays a vital role in the encapsulation of photovoltaic modules. Its main function is to protect the battery cells and bond them to the glass and backplane to form a photovoltaic module that can output direct current. Different types of photovoltaic films have their own unique performance characteristics and application scenarios. For example, transparent EVA film is widely used in conventional photovoltaic module encapsulation due to its high transparency and good adhesion, but due to the fact that EVA film is prone to hydrolysis in the light and heat environment, it produces acetic acid, which corrodes the battery cells and welding strips, resulting in power attenuation. POE film is particularly suitable for the encapsulation of N-type TOPCon battery modules due to its excellent molecular stability and sealing and waterproof properties.

[0003] Although POE has excellent water-blocking and packaging properties, in actual use, due to the limitations of the POE synthesis process, there are often a small amount of metal ion residues in the synthetic product. In addition, the reaction of the additives will also release some acidic substances. In the presence of water, these impurities form an electrolyte solution. The metal parts of photovoltaic modules and battery cells, such as bus bars, grid lines, and welding strips, will be corroded, thereby causing the power of the photovoltaic modules to attenuate.

[0004] In order to solve the corrosion problem of battery cells, the film end is generally added with alkaline metal oxides, metal hydroxides and porous adsorbents to neutralize and adsorb acidic substances and metal ions in the film system through chemical or physical effects. However, these metal oxides are small solid particles with inherent defects of uneven distribution, and their high surface energy will cause agglomeration.

[0005] Therefore, how to provide an anti-corrosion additive that can be evenly distributed is a technical problem that needs to be solved urgently in this field.

[0006] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0007] The embodiments of the present disclosure at least provide a corrosion-resistant POE packaging film for a TOPCon battery assembly and a preparation method thereof.

[0008] In the first aspect, the embodiments of the present disclosure provide a corrosion-resistant POE encapsulation film for a TOPCon battery module, comprising: the following raw materials, measured by mass: 100 parts of photovoltaic-grade POE resin, 0.01-3 parts of initiator, 0.01-3 parts of cross-linking agent, 0.01-3 parts of silane coupling agent, 0.001-0.5 parts of antioxidant, 0.001-0.5 parts of light stabilizer, and 0.1-0.5 parts of corrosion-resistant additive; wherein the corrosion-resistant additive is liquid potassium lactate.

[0009] In an optional embodiment, the purity of the potassium lactate is not less than 76%, the potassium content is not less than 23%, and the density is 1.41-1.46 g / mL.

[0010] In an optional embodiment, the photovoltaic grade POE resin has a melt flow rate of 1-25 g / 10 min and a volume resistivity of ≥1.0×10 15 , the melting temperature is 50-100℃.

[0011] In an optional embodiment, the initiator is any one or more of tert-butyl peroxy isopropyl carbonate, tert-amyl peroxy (2-ethylhexyl) carbonate, diisopropyl peroxide, di-tert-butyl peroxide diisopropyl benzene, and 2,5-dimethyl-2,5-bis (tert-butylperoxy) hexane.

[0012] In an optional embodiment, the auxiliary cross-linking agent is any one or more combinations of triallyl isocyanurate, trimethylolpropane trimethacrylate, propoxylated glycerol triacrylate, ethoxylated trimethylolpropane trimethacrylate, glycerol trihydroxypropyl ether triacrylate, trimethylolpropane diallyl ether, triallyl cyanurate, 1,6-hexanediol diacrylate, N,N'-methylenebisacrylamide, acryloylmorpholine, propoxylated (2) neopentyl glycol diacrylate, trivinylmethoxysilane, trivinylethoxysilane, allyl triethoxysilane, tetramethyltetravinylcyclotetrasiloxane, pentaerythritol triacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, propoxylated pentaerythritol tetraacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, and ethoxylated glycerol triacrylate.

[0013] In an optional embodiment, the silane coupling agent is any one or more combinations of n-propyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriperoxide tert-butylsilane, and vinyltriacetoxysilane.

[0014] In an optional embodiment, the antioxidant is any one or more combinations of bis(4-octylphenol) diphosphate, pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxy)phenylpropionate, 2,6-di-tert-butyl-p-cresol, 4,4'-thiobis(3-methyl-6-tert-butylphenol), dilaurothiodipropionate, and tris(2,4-di-tert-butylphenyl)phosphite.

[0015] In an optional embodiment, the light stabilizer is a combination of any one or more of bis-2,2,6,6-tetramethylpiperidinol ester, 3,5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester, bis(2,2,6,6-tetramethylpiperidinyl)sebacate, tris(1,2,2,6,6-pentamethyl-4-piperidinyl)phosphite, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl)sebacate, and bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate.

[0016] In the second aspect, the embodiments of the present disclosure also provide a method for preparing the corrosion-resistant POE packaging film for TOPCon battery modules as described above, comprising the following steps: step S1, mixing the initiator, the cross-linking agent, the silane coupling agent, the antioxidant, the light stabilizer, the corrosion-resistant additive and the photovoltaic-grade POE resin in respective proportions, and pouring them into a single-screw extrusion casting machine; step S2, the corrosion-resistant POE packaging film for TOPCon battery modules can be obtained through the processes of melt extrusion, film casting, embossing, cooling, pulling and winding.

[0017] In a third aspect, the embodiments of the present disclosure further provide a TOPCon battery assembly, which uses the corrosion-resistant POE packaging film for the TOPCon battery assembly as described above.

[0018] The beneficial effect of the present invention is that the corrosion-resistant POE encapsulation film for TOPCon battery components and the preparation method thereof improve the grid line corrosion problem of the component in a high temperature and high humidity environment by adding liquid potassium lactate. At the same time, the liquid corrosion-resistant additive also overcomes the problem of uneven distribution of traditional solid powder and the decrease in film transmittance after agglomeration. More importantly, the liquid corrosion-resistant additive can be directly mixed with the resin particles and extruded without further modification and granulation, thereby simplifying the production process.

[0019] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 EL images of the monolithic assembly PCT after different time periods of the examples and comparative examples provided in the embodiments of the present disclosure. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like 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. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0025] Herein, example 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 modifying 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.

[0026] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. The terms "comprise", "include" and "have" are inclusive, and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude 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 interpreted as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0027] The patent "POE encapsulation film for photovoltaic modules, its preparation method and photovoltaic modules" with publication number CN 117467366 A includes the following raw materials: 70-95 parts of POE base resin, 2-25 parts of POE resin processing particles, 0.02-3 parts of cross-linking agent, 0.02-3 parts of auxiliary cross-linking agent, 0.02-2 parts of silane coupling agent, 0.01-2 parts of anti-PID additive, 0.005-2 parts of antioxidant and 0.005-2 parts of light stabilizer; the POE resin processing particles are granulated by 1-20 parts by mass of POE second resin and 0.1-5 parts by mass of low acid additives, wherein the low acid additives are aluminum hydroxide, magnesium hydroxide and calcium hydroxide, aluminum oxide, zinc oxide, magnesium oxide, hydrotalcite, etc. The addition of these corrosion-resistant additives can effectively improve the corrosion problem of the components, but even so, there are still some technical problems.

[0028] First, traditional corrosion-resistant additives are mainly nano-scale solid powders, whose high surface energy makes them easy to agglomerate, and then disperse unevenly in the film, resulting in unstable corrosion resistance of the film and a decrease in the light transmittance of the film.

[0029] Secondly, in order to increase the dispersibility of the solid corrosion-resistant additive, further surface modification treatment is required, which undoubtedly increases the cost.

[0030] The defects existing in the above solutions are the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure for the above problems below should be the contributions made by the inventor to the present disclosure during the disclosure process.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0033] The disclosed embodiment provides a corrosion-resistant POE encapsulation film for a TOPCon battery assembly, comprising: the following raw materials, measured by mass: 100 parts of photovoltaic-grade POE resin, 0.01-3 parts of initiator, 0.01-3 parts of cross-linking agent, 0.01-3 parts of silane coupling agent, 0.001-0.5 parts of antioxidant, 0.001-0.5 parts of light stabilizer, 0.1-0.5 parts of corrosion-resistant additive; wherein the corrosion-resistant additive is liquid potassium lactate.

[0034] Specifically, the liquid corrosion-resistant additive may achieve better corrosion resistance by compounding with other corrosion-resistant additives. The present invention only illustrates the corrosion resistance effect of using the liquid corrosion-resistant additive alone. The compounding with other corrosion-resistant additives is also within the protection scope of the present patent.

[0035] In some embodiments, specifically, the purity of the potassium lactate is not less than 76%, the potassium content is not less than 23%, and the density is 1.41-1.46 g / mL.

[0036] Specifically, the lactate ion coordinates with the metal through an oxygen atom of the carboxylic acid group and an oxygen atom of the hydroxyl group through chelation to form a lactate complex; at the same time, lactic acid itself is a weak acid, and the lactate ion will absorb some hydrogen ions and act as an acid absorber. The combination of these two effects further reduces the corrosion caused by metal ions and hydrogen ions during the wet heat aging process of the component.

[0037] In some embodiments, specifically, the melt flow rate of the photovoltaic-grade POE resin is 1-25 g / 10 min, and the volume resistivity is ≥1.0×10 15 , the melting temperature is 50-100℃.

[0038] In some embodiments, specifically, the initiator is any one or more of tert-butyl peroxy isopropyl carbonate, tert-amyl peroxy (2-ethylhexyl) carbonate, diisopropylbenzene peroxide, di-tert-butyl peroxide diisopropylbenzene, and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.

[0039] In some embodiments, specifically, the auxiliary cross-linking agent is any one or more combinations of triallyl isocyanurate, trimethylolpropane trimethacrylate, propoxylated glycerol triacrylate, ethoxylated trimethylolpropane trimethacrylate, glycerol trihydroxypropyl ether triacrylate, trimethylolpropane diallyl ether, triallyl cyanurate, 1,6-hexanediol diacrylate, N,N'-methylenebisacrylamide, acryloylmorpholine, propoxylated (2) neopentyl glycol diacrylate, trivinylmethoxysilane, trivinylethoxysilane, allyl triethoxysilane, tetramethyltetravinylcyclotetrasiloxane, pentaerythritol triacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, propoxylated pentaerythritol tetraacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, and ethoxylated glycerol triacrylate.

[0040] In some embodiments, specifically, the silane coupling agent is any one or more combinations of n-propyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltert-butyltriperoxide silane, and vinyltriacetoxysilane.

[0041] In some embodiments, specifically, the antioxidant is any one or more combinations of bis(4-octylphenol) diphosphate, pentaerythritol tetra(3,5-di-tert-butyl-4-hydroxy)phenylpropionate, 2,6-di-tert-butyl-p-cresol, 4,4'-thiobis(3-methyl-6-tert-butylphenol), dilaurylthiodipropionate, and tris(2,4-di-tert-butylphenyl)phosphite.

[0042] In some embodiments, specifically, the light stabilizer is a combination of any one or more of bis-2,2,6,6-tetramethylpiperidinol ester, 3,5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester, bis(2,2,6,6-tetramethylpiperidinyl)sebacate, tris(1,2,2,6,6-pentamethyl-4-piperidinyl)phosphite, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl)sebacate, and bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate.

[0043] The disclosed embodiment also provides a method for preparing the corrosion-resistant POE packaging film for TOPCon battery modules as described above, comprising the following steps: step S1, mixing the initiator, the cross-linking agent, the silane coupling agent, the antioxidant, the light stabilizer, the corrosion-resistant additive and the photovoltaic-grade POE resin in respective proportions and pouring them into a single-screw extrusion casting machine; step S2, obtaining the corrosion-resistant POE packaging film for TOPCon battery modules through the processes of melt extrusion, film casting, embossing, cooling, pulling and winding.

[0044] In some embodiments, it should be noted that, in order to facilitate processing and production, the liquid corrosion-resistant additive in this solution can also be first extruded with the resin to prepare a corrosion-resistant masterbatch, and then added to the matrix resin for extrusion and casting into a film. The method of using the corrosion-resistant masterbatch is also within the protection scope of the patent of this invention.

[0045] The disclosed embodiment also provides a TOPCon battery assembly, which uses the corrosion-resistant POE packaging film for the TOPCon battery assembly as described above.

[0046] The liquid anti-corrosion additive used in this embodiment is purchased directly from a specialized manufacturer.

[0047] Example 1

[0048] In this embodiment, in parts by mass, 100 parts of POE resin, 0.5 parts of tert-amyl peroxy (2-ethylhexyl) carbonate, 0.4 parts of tert-butyl peroxy carbonate-2-ethylhexyl ester, 0.5 parts of triallyl isocyanurate, 0.45 parts of propyl trimethoxysilane, 0.3 parts of tetramethyltetravinylcyclotetrasiloxane, 0.05 parts of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 0.1 parts of bis-2,2,6,6-tetramethylpiperidinol sebacate, and 0.15 parts of liquid potassium lactate are mixed evenly, and then subjected to the processes of pre-mixing, melt extrusion, film casting, cooling, slitting and winding to obtain a photovoltaic film sample.

[0049] Example 2

[0050] In this embodiment, in parts by mass, 100 parts of POE resin, 0.5 parts of tert-amyl peroxy (2-ethylhexyl) carbonate, 0.4 parts of tert-butyl peroxy carbonate-2-ethylhexyl ester, 0.5 parts of triallyl isocyanurate, 0.45 parts of propyl trimethoxysilane, 0.3 parts of tetramethyltetravinylcyclotetrasiloxane, 0.05 parts of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 0.1 parts of bis-2,2,6,6-tetramethylpiperidinol sebacate, and 0.3 parts of liquid potassium lactate are mixed evenly, and then subjected to the processes of pre-mixing, melt extrusion, film casting, cooling, slitting and winding to obtain a photovoltaic film sample.

[0051] Comparative Example 1

[0052] In this comparative example, by mass, 100 parts of POE resin, 0.5 parts of tert-amyl peroxy (2-ethylhexyl) carbonate, 0.4 parts of tert-butyl peroxy carbonate-2-ethylhexyl ester, 0.5 parts of triallyl isocyanurate, 0.45 parts of propyl trimethoxysilane, 0.3 parts of tetramethyl tetravinyl cyclotetrasiloxane, 0.05 parts of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 0.1 parts of sebacic acid bis-2,2,6,6-tetramethyl piperidinol ester, after the above materials are mixed evenly, pre-mixed, melt extruded, cast film, cooled, slit and rolled, the photovoltaic film sample is prepared. The difference between this comparative example and the embodiment is that no corrosion-resistant additive is added.

[0053] Comparative Example 2

[0054] In this comparative example, by mass, 10 parts of POE resin and 0.2 parts of nano-MgO powder were first mixed evenly, poured into a twin-screw extruder, and prepared at 160-220°C to obtain a corrosion-resistant masterbatch for standby use. 90 parts of POE resin, 0.5 parts of tert-amyl peroxy (2-ethylhexyl) carbonate, 0.4 parts of tert-butyl peroxy carbonate-2-ethylhexyl ester, 0.5 parts of triallyl isocyanurate, 0.45 parts of propyl trimethoxysilane, 0.3 parts of tetramethyl tetravinyl cyclotetrasiloxane, 0.05 parts of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 0.1 parts of bis-2,2,6,6-tetramethylpiperidinol sebacate, and 10 parts of corrosion-resistant masterbatch were mixed evenly, and then subjected to premixing, melt extrusion, cast film, cooling, slitting, and winding to obtain a photovoltaic film sample. The difference between this comparative example and the embodiment is that the corrosion-resistant additive is solid nano-MgO.

[0055] Performance Testing

[0056] The encapsulation films obtained through the above-mentioned embodiments and comparative examples are applied to the encapsulation of solar cell modules, and the evaluation results are listed in the following Table 1.

[0057] Table 1 Light transmittance test data of examples and comparative examples

[0058]

[0059] See also Figure 1 ,like Figure 1 As shown, the experimental results are as follows:

[0060] 1. In Comparative Example 1, no corrosion-resistant additive was added. After PCT 48h, the cell exhibited serious grid line corrosion (darkened part of EL image) that spread from the periphery to the center. However, in Examples 1 and 2, to which liquid corrosion-resistant additives were added, the grid line corrosion was significantly reduced compared with Comparative Example 1. At the same time, the light transmittance of the Example and Comparative Example 1 was compared, and it can be seen that the difference in light transmittance was not large, indicating that the addition of liquid corrosion-resistant additives did not reduce the light transmittance of the film.

[0061] 2. Example Compared with Comparative Example 2, although the solid corrosion-resistant additive (nano-MgO used in this comparative example) can also play a corrosion-resistant effect, its light transmittance decreases.

[0062] In summary, the corrosion-resistant POE encapsulation film for TOPCon battery components and its preparation method improve the grid line corrosion problem of the component in high temperature and high humidity environment by adding liquid potassium lactate. At the same time, the liquid corrosion-resistant additive also overcomes the problem of uneven distribution of traditional solid powder and the decrease in film transmittance after agglomeration. More importantly, the liquid corrosion-resistant additive can be directly mixed with the resin particles and extruded without further modification and granulation, which simplifies the production process.

[0063] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A corrosion-resistant POE encapsulation film for TOPCon battery components, characterized in that: The raw materials are as follows: 100 parts of photovoltaic grade POE resin, 0.01-3 parts of initiator, 0.01-3 parts of cross-linking agent, 0.01-3 parts of silane coupling agent, 0.001-0.5 parts of antioxidant, 0.001-0.5 parts of light stabilizer, 0.1-0.5 parts of corrosion resistance additive; wherein The corrosion-resistant additive is liquid potassium lactate.

2. The corrosion-resistant POE packaging film for TOPCon battery components according to claim 1, characterized in that: The purity of the potassium lactate is not less than 76%, the potassium content is not less than 23%, and the density is 1.41-1.46 g / mL.

3. The corrosion-resistant POE packaging film for TOPCon battery components according to claim 1, characterized in that: The melt flow rate of the photovoltaic grade POE resin is 1-25g / 10min, and the volume resistivity is ≥1.0×10 15 , the melting temperature is 50-100℃.

4. The corrosion-resistant POE packaging film for TOPCon battery components according to claim 1, characterized in that: The initiator is any one or more of tert-butyl isopropyl peroxycarbonate, tert-amyl peroxy (2-ethylhexyl) carbonate, diisopropyl peroxide, di-tert-butyl diisopropyl peroxide, and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.

5. The corrosion-resistant POE packaging film for TOPCon battery components according to claim 1, characterized in that: The auxiliary cross-linking agent is any one or more of triallyl isocyanurate, trimethylolpropane trimethacrylate, propoxylated glycerol triacrylate, ethoxylated trimethylolpropane trimethacrylate, glycerol trihydroxypropyl ether triacrylate, trimethylolpropane diallyl ether, triallyl cyanurate, 1,6-hexanediol diacrylate, N,N'-methylenebisacrylamide, acryloylmorpholine, propoxylated (2) neopentyl glycol diacrylate, trivinylmethoxysilane, trivinylethoxysilane, allyltriethoxysilane, tetramethyltetravinylcyclotetrasiloxane, pentaerythritol triacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, propoxylated pentaerythritol tetraacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, and ethoxylated glycerol triacrylate.

6. The corrosion-resistant POE packaging film for TOPCon battery components according to claim 1, characterized in that: The silane coupling agent is any one or more combinations of n-propyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltert-butyltriperoxidesilane, and vinyltriacetoxysilane.

7. The corrosion-resistant POE packaging film for TOPCon battery components according to claim 1, characterized in that: The antioxidant is any one or more of bis(4-octylphenol) diphosphate, pentaerythritol tetra(3,5-di-tert-butyl-4-hydroxy)phenylpropionate, 2,6-di-tert-butyl-p-cresol, 4,4'-thiobis(3-methyl-6-tert-butylphenol), dilaurothiodipropionate, and tris(2,4-di-tert-butylphenyl)phosphite.

8. The corrosion-resistant POE packaging film for TOPCon battery components according to claim 1, characterized in that: The light stabilizer is any one or more of bis-2,2,6,6-tetramethylpiperidinol ester, 3,5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester, bis(2,2,6,6-tetramethylpiperidinyl)sebacate, tris(1,2,2,6,6-pentamethyl-4-piperidinyl)phosphite, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl)sebacate, and bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate.

9. A method for preparing a corrosion-resistant POE encapsulation film for a TOPCon battery assembly as claimed in any one of claims 1 to 8, characterized in that: The steps include: Step S1, mixing the initiator, the co-crosslinking agent, the silane coupling agent, the antioxidant, the light stabilizer, the corrosion-resistant additive and the photovoltaic-grade POE resin uniformly according to the proportions, and pouring the mixture into a single-screw extruder casting machine; Step S2, the corrosion-resistant POE packaging film for the TOPCon battery assembly can be obtained through the processes of melt extrusion, film casting, embossing, cooling, pulling, and winding.

10. A TOPCon battery assembly, characterized in that: The corrosion-resistant POE packaging film for TOPCon battery components as described in any one of claims 1 to 8 is used.

Images