Packaging adhesive film for HJT battery, preparation method of packaging adhesive film and photovoltaic module

Abstract

The invention belongs to the technical field of solar cells, and particularly relates to a packaging adhesive film for an HJT cell, a preparation method of the packaging adhesive film and a photovoltaic module. The packaging adhesive film for the HJT battery, provided by the invention, is prepared from the following components in parts by mass: 30 to 80 parts of POE (Polyolefin Elastomer) resin, 20 to 50 parts of polyolefin resin, 0.1 to 0.8 part of assistant crosslinking agent, 0.2 to 1 part of silane coupling agent, 0.05 to 0.4 part of light stabilizer and 0.01 to 0.2 part of antioxidant. According to the packaging adhesive film disclosed by the invention, the PEO resin and the polyolefin resin are used together, and the characteristics of the PEO resin and the polyolefin resin are integrated, so that the prepared packaging adhesive film has better adhesive force with a battery and has better light transmission.

Description

Technical Field

[0001] The invention belongs to the technical field of solar cells, and in particular relates to a packaging adhesive film for HJT cells, a preparation method thereof, and a photovoltaic module. Background Art

[0002] With the rapid development of solar photovoltaic power generation technology and applications, photovoltaic power generation has become one of the important renewable energy sources. Currently, the most popular photovoltaic industry is PERC battery, and in the future TOPCon and heterojunction batteries will become the mainstream trend. The average conversion efficiency of TOPCon mass production is > 23%, and heterojunction cells have a higher conversion efficiency, which is the cornerstone of the photovoltaic industry's move towards higher battery efficiency.

[0003] During use, solar photovoltaic cells are easily affected by natural factors such as heat, light, oxygen, and moisture, which may lead to a decrease in photoelectric conversion efficiency or even failure. As an important component of photovoltaic modules, the main function of encapsulation film is to protect solar cells and tightly bond the cells to glass, backplane and other materials into a whole. Encapsulation materials play a role in bonding and protection in the module. More and more cells are used in photovoltaic modules, and the performance of various cells is different, and the demand for encapsulation film is also different; for example, P-type cells require films with high PID resistance; heterojunction cells with round welding strips require films with non-slip surfaces; CIGS cells are afraid of heat and require low-temperature lamination. As the requirements for encapsulation films become higher and higher, encapsulation films with different properties have attracted widespread attention.

[0004] HJT cells have the characteristics of simple structure, low process temperature, good passivation effect, high open circuit voltage, and excellent temperature characteristics. However, the current HJT technology is compatible with the next generation of more efficient battery technology. There are obstacles such as high equipment investment and poor adhesion between the ITO layer on the surface of HJT and the film, which hinder its rapid development. Therefore, with the continuous development of heterojunction cells, the high adhesion performance of the encapsulation film and the stringent requirements for ensuring the high reliability of HJT components make the development of HJT battery-specific encapsulation film increasingly important. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention provides a packaging film for HJT batteries, which uses PEO resin and polyolefin resin together, and combines the characteristics of both, so that the prepared packaging film has better adhesion with the battery and better light transmittance.

[0006] The packaging film for the HJT battery of the embodiment of the present invention includes: 30-80 parts of POE resin, 20-50 parts of polyolefin resin, 0.1-0.8 parts of cross-linking agent, 0.2-1 parts of silane coupling agent, 0.05-0.4 parts of light stabilizer, and 0.01-0.2 parts of antioxidant, calculated by mass.

[0007] The advantages and technical effects brought by the packaging film for HJT batteries in the embodiments of the present invention are that PEO resin and polyolefin resin are used together, their respective characteristics are combined, and the content is limited within a suitable range, so that the prepared packaging film has better adhesion to the battery and better light transmittance.

[0008] In some embodiments, the antioxidant includes at least one of butylated hydroxytoluene, tert-butylhydroquinone, phenyl o-hydroxybenzoate, 2,4-dihydroxybenzophenone, and 2-(2-hydroxy-5-methylphenyl)benzotriazole.

[0009] In some embodiments, the auxiliary cross-linking agent includes at least one of triallyl isocyanurate, triallyl isocyanurate, triallyl cyanurate, pentaerythritol triacrylate, and trimethylolpropane triacrylate.

[0010] In some embodiments, the silane coupling agent includes at least one of vinyltrimethoxysilane, vinyltriethoxysilane, γ-aminopropyltriethoxysilane, 3-isocyanatepropyltriethoxysilane, 3-glycidyloxypropyltriethoxysilane, or 3-(2,3-epoxypropyloxy)propyltrimethoxysilane.

[0011] In some embodiments, the light stabilizer includes at least one of succinic acid, bis-2,2,6,6-tetramethylpiperidinol sebacate, hindered amines, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, tris(2,4-di-tert-butylphenyl) phosphite, and 2,2,6,6-tetramethyl-4-piperidinyl ester.

[0012] In some embodiments, the packaging film for the HJT battery includes: 40 to 70 parts of POE resin; 30 to 40 parts of polyolefin resin; 0.2 to 0.6 parts of a cross-linking agent; 0.5 to 0.8 parts of a silane coupling agent; 0.1 to 0.3 parts of a light stabilizer; and 0.05 to 0.1 parts of an antioxidant, calculated in parts by mass.

[0013] In some embodiments, the packaging film for the HJT battery includes: 45-60 parts of POE resin, 34-38 parts of polyolefin resin, 0.3-0.5 parts of cross-linking agent, 0.6-0.7 parts of silane coupling agent, 0.1-0.2 parts of light stabilizer, and 0.06-0.08 parts of antioxidant, calculated by mass.

[0014] In some embodiments, the packaging film has a thickness of 0.1 to 1.5 mm.

[0015] The embodiment of the present invention also provides a method for preparing a packaging film for a HJT battery, comprising the following steps:

[0016] (1) uniformly mixing POE resin, polyolefin resin, co-crosslinking agent, silane coupling agent, light stabilizer and antioxidant by weight, and melt-extruding through an extruder;

[0017] (2) adding the material obtained in step (1) into a casting machine for melting and casting to form a packaging film.

[0018] The embodiment of the present invention further provides a photovoltaic cell assembly, comprising the above-mentioned packaging film for HJT cells or the packaging film for HJT cells prepared by the above-mentioned preparation method. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below. The embodiments are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0020] The packaging film for the HJT battery of the embodiment of the present invention includes: 30-80 parts of POE resin, 20-50 parts of polyolefin resin, 0.1-0.8 parts of cross-linking agent, 0.2-1 parts of silane coupling agent, 0.05-0.4 parts of light stabilizer, and 0.01-0.2 parts of antioxidant, calculated by mass.

[0021] The packaging film for the HJT battery in the embodiment of the present invention uses PEO resin and polyolefin resin together, combines their respective characteristics, and limits the content within a suitable range, so that the prepared packaging film has better adhesion to the battery and better light transmittance.

[0022] In some embodiments, preferably, the antioxidant includes at least one of butylated hydroxytoluene, tert-butylhydroquinone, phenyl o-hydroxybenzoate, 2,4-dihydroxybenzophenone, and 2-(2-hydroxy-5-methylphenyl)benzotriazole.

[0023] In some embodiments, preferably, the auxiliary cross-linking agent includes at least one of triallyl isocyanurate, triallyl isocyanurate, triallyl cyanurate, pentaerythritol triacrylate, and trimethylolpropane triacrylate.

[0024] In some embodiments, preferably, the silane coupling agent includes at least one of vinyltrimethoxysilane, vinyltriethoxysilane, γ-aminopropyltriethoxysilane, 3-isocyanatepropyltriethoxysilane, 3-glycidyloxypropyltriethoxysilane or 3-(2,3-epoxypropyloxy)propyltrimethoxysilane.

[0025] In some embodiments, preferably, the light stabilizer includes at least one of succinic acid, bis-2,2,6,6-tetramethylpiperidinol sebacate, hindered amines, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, tris(2,4-di-tert-butylphenyl) phosphite, and 2,2,6,6-tetramethyl-4-piperidinyl ester.

[0026] In some embodiments, preferably, the packaging film for the HJT battery includes: 40-70 parts of POE resin; 30-40 parts of polyolefin resin; 0.2-0.6 parts of cross-linking agent; 0.5-0.8 parts of silane coupling agent; 0.1-0.3 parts of light stabilizer; 0.05-0.1 parts of antioxidant, calculated by mass. Further preferably, the packaging film for the HJT battery includes: 45-60 parts of POE resin; 34-38 parts of polyolefin resin; 0.3-0.5 parts of cross-linking agent; 0.6-0.7 parts of silane coupling agent; 0.1-0.2 parts of light stabilizer; 0.06-0.08 parts of antioxidant, calculated by mass.

[0027] In some embodiments, preferably, the packaging film has a thickness of 0.1-1.5 mm, such as 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.

[0028] The embodiment of the present invention also provides a method for preparing a packaging film for a HJT battery, comprising the following steps:

[0029] (1) uniformly mixing POE resin, polyolefin resin, co-crosslinking agent, silane coupling agent, light stabilizer and antioxidant by weight, and melt-extruding through an extruder;

[0030] (2) adding the material obtained in step (1) into a casting machine for melting and casting to form a packaging film.

[0031] The embodiment of the present invention further provides a photovoltaic cell assembly, comprising the above-mentioned packaging film for HJT cells or the packaging film for HJT cells prepared by the above-mentioned preparation method.

[0032] The technical solution of the present invention is described in detail below in conjunction with specific embodiments.

[0033] Example 1

[0034] (1) POE resin, polyolefin resin, triallyl isocyanurate, vinyl triethoxysilane, bis-2,2,6,6-tetramethylpiperidinol sebacate and tert-butylhydroquinone are uniformly mixed by weight, and melt-extruded through an extruder;

[0035] (2) adding the material obtained in step (1) into a casting machine for melting and casting to form a packaging film.

[0036] The packaging film prepared in this embodiment includes: 58.52 parts of POE resin, 40 parts of polyolefin resin, 0.3 parts of triallyl isocyanurate, 1 part of vinyl triethoxysilane, 0.08 parts of bis-2,2,6,6-tetramethylpiperidinol sebacate, and 0.1 parts of tert-butylhydroquinone. Calculated by mass, the thickness of the packaging film is 0.8 mm.

[0037] Example 2

[0038] The preparation method of this embodiment is the same as that of Example 1, except that the prepared packaging film includes: 60 parts of POE resin, 38.73 parts of polyolefin resin, 0.4 parts of trimethylolpropane triacrylate, 0.7 parts of vinyl triethoxysilane, 0.1 parts of tris(2,4-di-tert-butylphenyl) phosphite, and 0.07 parts of phenyl o-hydroxybenzoate. The thickness of the packaging film is 0.5 mm, calculated by mass.

[0039] Example 3

[0040] The preparation method of this embodiment is the same as that of Example 1, except that the prepared packaging film includes: 70 parts of POE resin, 29.13 parts of polyolefin resin, 0.2 parts of trimethylolpropane triacrylate, 0.5 parts of vinyltrimethoxysilane, 0.1 parts of 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, and 0.07 parts of tert-butylhydroquinone. The thickness of the packaging film is 1.3 mm, calculated by mass.

[0041] Comparative Example 1

[0042] The preparation method of this comparative example is the same as that of Example 1, except that the prepared encapsulation film includes: 25 parts of POE resin, 73.53 parts of polyolefin resin, 0.5 parts of triallyl isocyanurate, 0.7 parts of vinyl triethoxysilane, 0.2 parts of bis-2,2,6,6-tetramethylpiperidinol sebacate, and 0.07 parts of tert-butylhydroquinone. The thickness of the encapsulation film is 1.3 mm, calculated by mass.

[0043] Comparative Example 2

[0044] The preparation method of this comparative example is the same as that of Example 1, except that the prepared encapsulation film includes: 85 parts of POE resin, 13.53 parts of polyolefin resin, 0.5 parts of triallyl isocyanurate, 0.7 parts of vinyl triethoxysilane, 0.2 parts of bis-2,2,6,6-tetramethylpiperidinol sebacate, and 0.07 parts of tert-butylhydroquinone. The thickness of the encapsulation film is 1.3 mm, calculated by mass.

[0045] The performance tests were conducted on the encapsulation films prepared in Examples 1 to 3 and Comparative Examples 1 to 2, and the experimental data are shown in Table 1. The peel force and light transmittance test methods refer to GB / T 29848-2013 (National Standard "Ethylene-vinyl acetate copolymer (EVA) film for photovoltaic module encapsulation").

[0046] Table 1

[0047]

[0048] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0049] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A packaging film for HJT battery, characterized in that: include: 30-80 parts of POE resin, 20-50 parts of polyolefin resin, 0.1-0.8 parts of auxiliary cross-linking agent, 0.2-1 parts of silane coupling agent, 0.05-0.4 parts of light stabilizer, 0.01-0.2 parts of antioxidant, calculated by mass.

2. The packaging film for HJT battery according to claim 1, characterized in that: The antioxidant includes at least one of butylated hydroxytoluene, tert-butylhydroquinone, phenyl o-hydroxybenzoate, 2,4-dihydroxybenzophenone, and 2-(2-hydroxy-5-methylphenyl)benzotriazole.

3. The encapsulation film for HJT battery according to claim 1, characterized in that: The auxiliary cross-linking agent includes at least one of triallyl isocyanurate, triallyl isocyanurate, triallyl cyanurate, pentaerythritol triacrylate, and trimethylolpropane triacrylate.

4. The packaging film for HJT battery according to claim 1, characterized in that: The silane coupling agent includes at least one of vinyl trimethoxy silane, vinyl triethoxy silane, γ-aminopropyl triethoxy silane, 3-isocyanate propyl triethoxy silane, 3-glycidyloxypropyl triethoxy silane or 3-(2,3-epoxypropyloxy)propyl trimethoxy silane.

5. The packaging film for HJT battery according to claim 1, characterized in that: The light stabilizer includes at least one of succinic acid, bis-2,2,6,6-tetramethylpiperidinol sebacate, hindered amines, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, tris(2,4-di-tert-butylphenyl) phosphite, and 2,2,6,6-tetramethyl-4-piperidinyl ester.

6. The packaging film for HJT battery according to claim 1, characterized in that: include: 40-70 parts of POE resin, 30-40 parts of polyolefin resin, 0.2-0.6 parts of auxiliary cross-linking agent, 0.5-0.8 parts of silane coupling agent, 0.1-0.3 parts of light stabilizer, 0.05-0.1 parts of antioxidant, calculated by mass parts.

7. The packaging film for HJT battery according to claim 6, characterized in that: include: 45-60 parts of POE resin, 34-38 parts of polyolefin resin, 0.3-0.5 parts of auxiliary cross-linking agent, 0.6-0.7 parts of silane coupling agent, 0.1-0.2 parts of light stabilizer, 0.06-0.08 parts of antioxidant, calculated by mass.

8. The encapsulation film for HJT battery according to any one of claims 1 to 7, characterized in that: The packaging film has a thickness of 0.1 to 1.5 mm.

9. The method for preparing a packaging film for a HJT battery according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) uniformly mixing POE resin, polyolefin resin, co-crosslinking agent, silane coupling agent, light stabilizer and antioxidant by weight, and melt-extruding through an extruder; (2) adding the material obtained in step (1) into a casting machine to melt and cast to form a packaging film.

10. A photovoltaic cell assembly, characterized in that: The invention relates to a packaging adhesive film for a HJT battery comprising the packaging adhesive film for a HJT battery according to any one of claims 1 to 8 or the packaging adhesive film for a HJT battery prepared by the preparation method according to claim 9.

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