阅读说明：本技术 一种双面电池网格背板玻璃组件及其制备方法 (Double-sided battery grid backboard glass assembly and preparation method thereof ) 是由 赵卫东 费春燕 赵雅 詹建松 侯明浩 于 2021-07-28 设计创作，主要内容包括：本发明公开了一种双面电池网格背板玻璃组件,具体涉及光伏组件技术领域,双面电池组件包括依次层叠的正面封装玻璃层、EVA胶膜层、电池片层、POE胶膜层和网格背板玻璃层,所述网格背板玻璃层的向光面上设置有釉层,所述电池片层与EVA胶膜层和POE胶膜层接触的表面均设置有减反射膜。本发明EVA胶膜层采用乙烯-醋酸乙烯酯共聚物为原料,添加有改性亚磷酸酯抗氧剂,亚磷酸酯抗氧剂改性后提高了抗水解能力和稳定性,亚磷酸酯抗氧剂用于EVA胶膜层时不仅能够提高耐候性能,而且透光率较好,使得光伏组件的功率提高；釉层具有较高的反射率,可以充分利用串间距空白区域,增加光学二次反射,使得两侧电池串能够接受更多光线辐射量,增加光伏组件的功率。(The invention discloses a double-sided battery grid backboard glass assembly, and particularly relates to the technical field of photovoltaic assemblies. The EVA adhesive film layer adopts the ethylene-vinyl acetate copolymer as a raw material, the modified phosphite antioxidant is added, the hydrolysis resistance and the stability are improved after the phosphite antioxidant is modified, and when the phosphite antioxidant is used for the EVA adhesive film layer, the weather resistance can be improved, the light transmittance is good, so that the power of a photovoltaic module is improved; the glaze layer has higher reflectivity, can make full use of the blank area between strings, and increases optical secondary reflection, so that the battery strings on two sides can receive more light radiation quantity, and the power of the photovoltaic module is increased.)

1. The utility model provides a two-sided battery net backplate glass unit which characterized in that: two-sided battery pack is including positive encapsulation glass layer (1), EVA glued membrane layer (2), battery piece layer (3), POE glued membrane layer (4) and net backplate glass layer (5) that stack gradually, be provided with glaze layer (6) on the smooth surface of net backplate glass layer (5), battery piece layer (3) all are provided with antireflection coating (7) with the surface of EVA glued membrane layer (2) and POE glued membrane layer (4) contact.

2. The double-sided battery grid backplane glass assembly of claim 1, wherein: the EVA adhesive film layer (2) comprises the following raw materials in parts by weight: 60-90 parts of ethylene-vinyl acetate copolymer, 5-10 parts of polyolefin elastomer, 0.5-2.5 parts of modified phosphite ester antioxidant, 0.1-1 part of light stabilizer, 0.2-0.8 part of fluorescent whitening agent and 3-6 parts of first cross-linking agent; the POE adhesive film layer (4) comprises the following raw materials in parts by weight: 75-90 parts of graft modification POE resin, 0.5-3 parts of anti-aging auxiliary agent, 0.5-1.5 parts of coupling agent, 1-3 parts of second cross-linking agent, 0.1-0.6 part of ultraviolet absorbent and 0.1-0.6 part of antioxidant.

3. The double-sided battery grid backplane glass assembly of claim 1, wherein: the EVA adhesive film layer (2) comprises the following raw materials in parts by weight: 70-80 parts of ethylene-vinyl acetate copolymer, 7-9 parts of polyolefin elastomer, 1-2 parts of modified phosphite ester antioxidant, 0.4-0.6 part of light stabilizer, 0.4-0.6 part of fluorescent whitening agent and 4-5 parts of first cross-linking agent; the POE adhesive film layer (4) comprises the following raw materials in parts by weight: 80-85 parts of graft modification POE resin, 1.5-2 parts of anti-aging auxiliary agent, 0.8-1.2 parts of coupling agent, 2-3 parts of second cross-linking agent, 0.2-0.4 part of ultraviolet absorbent and 0.2-0.4 part of antioxidant.

4. The double-sided battery grid backplane glass assembly of claim 1, wherein: the EVA adhesive film layer (2) comprises the following raw materials in parts by weight: 75 parts of ethylene-vinyl acetate copolymer, 8 parts of polyolefin elastomer, 1.5 parts of modified phosphite ester antioxidant, 0.5 part of light stabilizer, 0.5 part of fluorescent whitening agent and 4.5 parts of first cross-linking agent; the POE adhesive film layer (4) comprises the following raw materials in parts by weight: 82 parts of graft modification POE resin, 1.8 parts of anti-aging auxiliary agent, 1 part of coupling agent, 2.5 parts of second cross-linking agent, 0.3 part of ultraviolet absorbent and 0.3 part of antioxidant.

5. The double-sided battery grid backplane glass assembly of claim 1, wherein: the light stabilizer is sebacic acid bis-2, 2,6, 6-tetramethyl piperidinol ester or N, N-bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 6-hexanediamine; the fluorescent whitening agent is 2, 5-bis (5-tert-butyl-2-benzoxazolyl) thiophene; the first cross-linking agent is a mixture of ethoxylated trimethylolpropane triacrylate and ethoxylated trimethylolpropane, and the anti-aging auxiliary agent is one of 2,2,6, 6-tetramethyl-4-piperidine stearate, salicylic acid or 2-hydroxy-4-n-octoxy benzophenone; the coupling agent is a silane coupling agent; the second cross-linking agent is a mixture of tert-butyl peroxy-2-ethyl hexyl carbonate and triallyl isocyanurate; the ultraviolet absorbent is 2-hydroxy-4-n-octoxy benzophenone, and the antioxidant is 6-tertiary butyl-4-methylphenol or bis (3, 5-tertiary butyl-4-hydroxyphenyl) thioether.

6. The double-sided battery grid backplane glass assembly of claim 5, wherein: the light reflection rate of the glaze layer (6) is 85-95%, and the weight ratio of the ethoxylated trimethylolpropane triacrylate to the ethoxylated trimethylolpropane in the first cross-linking agent is (3-5): 1, the weight ratio of tert-butyl peroxy-2-ethyl hexyl carbonate to triallyl isocyanurate in the second crosslinking agent is (2-4): 1, the grafting modification POE resin is maleic anhydride grafting modification POE resin.

7. The method for preparing a double-sided battery grid backplane glass assembly according to any one of claims 1 to 6, wherein: the preparation method comprises the following specific steps:

the method comprises the following steps: preparing an EVA adhesive film layer, placing weighed phosphite ester antioxidant into a reaction container for ultrasonic treatment, heating to 70-90 ℃, adding isooctanol, an organic amine compound, polycarbodiimide and a silane coupling agent into the reaction container, stirring for reaction for 30-50min, then keeping the temperature and standing for 2-4h, then filtering, concentrating, crystallizing and drying the filtrate to obtain modified phosphite ester antioxidant, uniformly mixing the modified phosphite ester antioxidant, an ethylene-vinyl acetate copolymer, a polyolefin elastomer, the modified phosphite ester antioxidant, a light stabilizer, a fluorescent whitening agent and a first cross-linking agent, placing the mixture into a double-screw extruder, heating and melting to extrude a film, and pressing, cooling and shaping by a compression roller to obtain the EVA adhesive film;

step two: preparing a POE adhesive film layer, namely uniformly stirring and mixing the weighed graft modified POE resin, the anti-aging auxiliary agent, the coupling agent, the second cross-linking agent, the ultraviolet absorbent and the antioxidant in parts by weight, putting the mixture into a double-screw extruder, heating and melting to extrude a film shape, and pressing the film by a compression roller, cooling and shaping the film, and rolling the film to obtain the POE adhesive film;

step three: welding the selected battery pieces by using welding strips to form a battery piece layer, then laying a front packaging glass layer, an EVA (ethylene vinyl acetate) adhesive film layer, the battery piece layer, a POE (polyolefin elastomer) adhesive film layer and a grid backboard glass layer in sequence, carrying out lamination treatment after laying, and assembling and packaging by using a frame to obtain the double-sided battery grid backboard glass assembly after lamination treatment.

8. The method for preparing a double-sided battery grid backplane glass assembly of claim 7, wherein: in the first step, the isooctanol, the organic amine compound, the polycarbodiimide and the silane coupling agent are respectively added in the amount of (10-15%), (8-15%), (5-8%) and (0.5-1.5%) of the total amount of the phosphite ester antioxidant.

9. The method for preparing a double-sided battery grid backplane glass assembly of claim 7, wherein: and selecting battery pieces with qualified appearance and same color and efficiency for welding when selecting the battery pieces in the third step.

10. The method for preparing a double-sided battery grid backplane glass assembly of claim 7, wherein: and (3) packaging in the third step to obtain the double-sided battery grid backboard glass assembly, and testing the electrical property, the weather resistance and the PID resistance.

Technical Field

The invention relates to the technical field of battery components, in particular to a double-sided battery grid backboard glass component and a preparation method thereof.

Background

The conventional photovoltaic module can only receive solar rays to generate electricity on the front side, and the double-sided photovoltaic module can effectively utilize the received rays to generate electricity on the back side besides the front side due to a special battery structure and a transparent back plate material, wherein the rays comprise ground reflected light, scattered light in the atmosphere, dust reflected light in the air, surrounding building reflected light and the like. The double-sided power generation characteristic of the double-sided photovoltaic module generally enables the double-sided photovoltaic module to generate more electric energy than the conventional photovoltaic module; nowadays, by means of advanced cell technology, the back surface of the solar cell does not need to be processed by an aluminum back surface field, and performance loss is avoided, which creates conditions for a double-sided cell. Under the condition that the unit installed capacity is the same, the generated energy of the double-sided photovoltaic system far exceeds that of a single-sided system. The measurement results show that the former has a higher power generation amount than the latter by 10% to 30% at the same unit installed capacity. Due to the ever-increasing demand for photovoltaic systems in desert and other areas where solar radiation intensity and ground reflectivity are very high, double-sided power generation solutions are becoming more and more popular.

The back of the double-sided photovoltaic module can generate electricity by utilizing reflected light from the ground and the like, the higher the reflectivity of the ground is, the stronger the light received by the back of the battery is, and the better the electricity generation effect is. Common ground reflectivities are: 15-25% of grassland, 25-35% of concrete and 55-75% of wet snow. The application of the double-sided photovoltaic module on the grassland can improve the power generation by 8-10 percent, and the maximum power generation can be improved by 30 percent on the snowfield. The main purpose is to generate more electric quantity in unit area, improve the generating efficiency, reduce cost and improve efficiency.

The existing double-sided photovoltaic module has insufficient back light utilization rate and effect, the weather resistance of the photovoltaic module is insufficient in the using process, and the power of an encapsulation adhesive film layer in the photovoltaic module is easy to attenuate under a high-temperature and high-humidity environment, so that the efficiency of the photovoltaic module is influenced.

Disclosure of Invention

In order to overcome the above defects in the prior art, embodiments of the present invention provide a double-sided battery grid backplane glass assembly and a method for manufacturing the same, and the problems to be solved by the present invention are: how to improve two-sided photovoltaic module's efficiency, improve photovoltaic module's weatherability.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a two-sided battery net backplate glass unit, two-sided battery unit is including positive encapsulation glass layer, EVA glued membrane layer, battery piece layer, POE glued membrane layer and the net backplate glass layer that stacks gradually, be provided with the glaze layer on the plain noodles of net backplate glass layer, battery piece layer all is provided with antireflection coating with the surface of EVA glued membrane layer and POE glued membrane layer contact.

In a preferred embodiment, the EVA film layer comprises the following raw materials in parts by weight: 60-90 parts of ethylene-vinyl acetate copolymer, 5-10 parts of polyolefin elastomer, 0.5-2.5 parts of modified phosphite ester antioxidant, 0.1-1 part of light stabilizer, 0.2-0.8 part of fluorescent whitening agent and 3-6 parts of first cross-linking agent; the POE adhesive film layer comprises the following raw materials in parts by weight: 75-90 parts of graft modification POE resin, 0.5-3 parts of anti-aging auxiliary agent, 0.5-1.5 parts of coupling agent, 1-3 parts of second cross-linking agent, 0.1-0.6 part of ultraviolet absorbent and 0.1-0.6 part of antioxidant.

In a preferred embodiment, the EVA film layer comprises the following raw materials in parts by weight: 70-80 parts of ethylene-vinyl acetate copolymer, 7-9 parts of polyolefin elastomer, 1-2 parts of modified phosphite ester antioxidant, 0.4-0.6 part of light stabilizer, 0.4-0.6 part of fluorescent whitening agent and 4-5 parts of first cross-linking agent; the POE adhesive film layer comprises the following raw materials in parts by weight: 80-85 parts of graft modification POE resin, 1.5-2 parts of anti-aging auxiliary agent, 0.8-1.2 parts of coupling agent, 2-3 parts of second cross-linking agent, 0.2-0.4 part of ultraviolet absorbent and 0.2-0.4 part of antioxidant.

In a preferred embodiment, the EVA film layer comprises the following raw materials in parts by weight: 75 parts of ethylene-vinyl acetate copolymer, 8 parts of polyolefin elastomer, 1.5 parts of modified phosphite ester antioxidant, 0.5 part of light stabilizer, 0.5 part of fluorescent whitening agent and 4.5 parts of first cross-linking agent; the POE adhesive film layer comprises the following raw materials in parts by weight: 82 parts of graft modification POE resin, 1.8 parts of anti-aging auxiliary agent, 1 part of coupling agent, 2.5 parts of second cross-linking agent, 0.3 part of ultraviolet absorbent and 0.3 part of antioxidant.

In a preferred embodiment, the light stabilizer is bis-2, 2,6, 6-tetramethylpiperidinol sebacate or N, N, -bis (2,2,6, 6-tetramethyl-4-piperidinyl) -1, 6-hexanediamine; the fluorescent whitening agent is 2, 5-bis (5-tert-butyl-2-benzoxazolyl) thiophene; the first cross-linking agent is a mixture of ethoxylated trimethylolpropane triacrylate and ethoxylated trimethylolpropane, and the anti-aging auxiliary agent is one of 2,2,6, 6-tetramethyl-4-piperidine stearate, salicylic acid or 2-hydroxy-4-n-octoxy benzophenone; the coupling agent is a silane coupling agent; the second cross-linking agent is a mixture of tert-butyl peroxy-2-ethyl hexyl carbonate and triallyl isocyanurate; the ultraviolet absorbent is 2-hydroxy-4-n-octoxy benzophenone, and the antioxidant is 6-tertiary butyl-4-methylphenol or bis (3, 5-tertiary butyl-4-hydroxyphenyl) thioether.

In a preferred embodiment, the glazing layer has a light reflectance of 85 to 95%, and the weight ratio of ethoxylated trimethylolpropane triacrylate to ethoxylated trimethylolpropane in the first crosslinker is (3 to 5): 1, the weight ratio of tert-butyl peroxy-2-ethyl hexyl carbonate to triallyl isocyanurate in the second crosslinking agent is (2-4): 1, the grafting modification POE resin is maleic anhydride grafting modification POE resin.

The invention also provides a preparation method of the double-sided battery grid backboard glass component, which comprises the following specific preparation steps:

the method comprises the following steps: preparing an EVA adhesive film layer, placing weighed phosphite ester antioxidant into a reaction container for ultrasonic treatment, heating to 70-90 ℃, adding isooctanol, an organic amine compound, polycarbodiimide and a silane coupling agent into the reaction container, stirring for reaction for 30-50min, then keeping the temperature and standing for 2-4h, then filtering, concentrating, crystallizing and drying the filtrate to obtain modified phosphite ester antioxidant, uniformly mixing the modified phosphite ester antioxidant, an ethylene-vinyl acetate copolymer, a polyolefin elastomer, the modified phosphite ester antioxidant, a light stabilizer, a fluorescent whitening agent and a first cross-linking agent, placing the mixture into a double-screw extruder, heating and melting to extrude a film, and pressing, cooling and shaping by a compression roller to obtain the EVA adhesive film;

step two: preparing a POE adhesive film layer, namely uniformly stirring and mixing the weighed graft modified POE resin, the anti-aging auxiliary agent, the coupling agent, the second cross-linking agent, the ultraviolet absorbent and the antioxidant in parts by weight, putting the mixture into a double-screw extruder, heating and melting to extrude a film shape, and pressing the film by a compression roller, cooling and shaping the film, and rolling the film to obtain the POE adhesive film;

step three: welding the selected battery pieces by using welding strips to form a battery piece layer, then laying a front packaging glass layer, an EVA (ethylene vinyl acetate) adhesive film layer, the battery piece layer, a POE (polyolefin elastomer) adhesive film layer and a grid backboard glass layer in sequence, carrying out lamination treatment after laying, and assembling and packaging by using a frame to obtain the double-sided battery grid backboard glass assembly after lamination treatment.

In a preferred embodiment, the isooctanol, the organic amine compound, the polycarbodiimide, and the silane coupling agent are added in amounts of (10-15%), (8-15%), (5-8%) and (0.5-1.5%) respectively, based on the total amount of the phosphite antioxidant in the first step.

In a preferred embodiment, when the battery pieces in the third step are selected, battery pieces with qualified appearance, same color and same efficiency are selected for welding.

In a preferred embodiment, the double-sided battery grid backplane glass assembly obtained by packaging in the third step is subjected to electrical property, weather resistance and PID resistance tests.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the double-sided battery grid backboard glass component prepared by adopting the raw material formula, the EVA adhesive film layer adopts the ethylene-vinyl acetate copolymer as the raw material, and the polyolefin elastomer, the modified phosphite antioxidant, the light stabilizer, the fluorescent whitening agent and the first cross-linking agent are added, so that the weather resistance and the light transmittance of the EVA adhesive film layer can be effectively improved, the hydrolysis resistance and the stability are improved after the phosphite antioxidant is modified, and the phosphite antioxidant can not only improve the weather resistance but also has better light transmittance when being used for the EVA adhesive film layer, so that the power of a photovoltaic component is improved; the POE adhesive film layer is prepared by taking graft modified POE resin as a raw material and adding an anti-aging auxiliary agent, a coupling agent, a second cross-linking agent, an ultraviolet absorbent and an antioxidant, the POE resin has good ultraviolet resistance and mechanical property after being graft modified by maleic anhydride, and the anti-aging auxiliary agent, the ultraviolet absorbent and the antioxidant can enable the POE adhesive film layer to have good weather resistance;

2. the back plate of the double-sided battery assembly adopts the grid back plate glass, the outer side surface of the back plate glass is in a grid shape, the grid lines are provided with the glaze layer, the glaze layer has higher reflectivity, the blank area of the string spacing can be fully utilized, the optical secondary reflection is increased, the battery strings on the two sides can receive more light radiation quantity, and the power of the photovoltaic assembly is increased.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic cross-sectional view of a two-sided battery pack of the present invention;

fig. 2 is a schematic view of a light-facing surface structure of a glass layer of the grid backplane of the present invention.

In the figure: 1 front packaging glass layer, 2EVA adhesive film layer, 3 battery sheet layers, 4POE adhesive film layer, 5 grid backboard glass layer, 6 glaze layer and 7 antireflection film.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

referring to fig. 1-2, the invention provides a double-sided battery grid backboard glass assembly, which comprises a front packaging glass layer 1, an EVA glue film layer 2, a battery sheet layer 3, a POE glue film layer 4 and a grid backboard glass layer 5 which are sequentially stacked, wherein a glaze layer 6 is arranged on a light facing surface of the grid backboard glass layer 5, and antireflection films 7 are arranged on the surfaces of the battery sheet layer 3, which are in contact with the EVA glue film layer 2 and the POE glue film layer 4.

In a preferred embodiment, the EVA film layer 2 comprises the following raw materials in parts by weight: 60 parts of ethylene-vinyl acetate copolymer, 5 parts of polyolefin elastomer, 0.5 part of modified phosphite ester antioxidant, 0.1 part of light stabilizer, 0.2 part of fluorescent whitening agent and 3 parts of first cross-linking agent; the POE adhesive film layer 4 comprises the following raw materials in parts by weight: 75 parts of graft modification POE resin, 0.5 part of anti-aging auxiliary agent, 0.5 part of coupling agent, 1 part of second cross-linking agent, 0.1 part of ultraviolet absorbent and 0.1 part of antioxidant.

In a preferred embodiment, the light stabilizer is bis-2, 2,6, 6-tetramethylpiperidinol sebacate or N, N, -bis (2,2,6, 6-tetramethyl-4-piperidinyl) -1, 6-hexanediamine; the fluorescent whitening agent is 2, 5-bis (5-tert-butyl-2-benzoxazolyl) thiophene; the first cross-linking agent is a mixture of ethoxylated trimethylolpropane triacrylate and ethoxylated trimethylolpropane, and the anti-aging auxiliary agent is one of 2,2,6, 6-tetramethyl-4-piperidine stearate, salicylic acid or 2-hydroxy-4-n-octoxy benzophenone; the coupling agent is a silane coupling agent; the second cross-linking agent is a mixture of tert-butyl peroxy-2-ethyl hexyl carbonate and triallyl isocyanurate; the ultraviolet absorbent is 2-hydroxy-4-n-octoxy benzophenone, and the antioxidant is 6-tertiary butyl-4-methylphenol or bis (3, 5-tertiary butyl-4-hydroxyphenyl) thioether.

In a preferred embodiment, the glazing layer 6 has an optical reflectance of 85 to 95%, and the weight ratio of ethoxylated trimethylolpropane triacrylate to ethoxylated trimethylolpropane in the first crosslinker is 4: 1, the weight ratio of tert-butyl peroxy-2-ethyl hexanoate carbonate to triallyl isocyanurate in the second crosslinking agent is 3: 1, the grafting modification POE resin is maleic anhydride grafting modification POE resin.

The invention also provides a preparation method of the double-sided battery grid backboard glass component, which comprises the following specific preparation steps:

the method comprises the following steps: preparing an EVA adhesive film layer, placing weighed phosphite ester antioxidant into a reaction container for ultrasonic treatment, heating to 80 ℃, adding isooctanol, an organic amine compound, polycarbodiimide and a silane coupling agent into the reaction container, stirring for reaction for 40min, then keeping the temperature and standing for 3h, then filtering, concentrating, crystallizing and drying the filtrate to obtain a modified phosphite ester antioxidant, uniformly mixing the modified phosphite ester antioxidant, an ethylene-vinyl acetate copolymer, a polyolefin elastomer, the modified phosphite ester antioxidant, a light stabilizer, a fluorescent whitening agent and a first cross-linking agent, placing the mixture into a double-screw extruder, heating and melting to extrude a film, and pressing, cooling and shaping the film by a compression roller to obtain the EVA adhesive film;

step two: preparing a POE adhesive film layer, namely uniformly stirring and mixing the weighed graft modified POE resin, the anti-aging auxiliary agent, the coupling agent, the second cross-linking agent, the ultraviolet absorbent and the antioxidant in parts by weight, putting the mixture into a double-screw extruder, heating and melting to extrude a film shape, and pressing the film by a compression roller, cooling and shaping the film, and rolling the film to obtain the POE adhesive film;

step three: welding the selected battery pieces by using welding strips to form a battery piece layer, then laying a front packaging glass layer, an EVA (ethylene vinyl acetate) adhesive film layer, the battery piece layer, a POE (polyolefin elastomer) adhesive film layer and a grid backboard glass layer in sequence, carrying out lamination treatment after laying, and assembling and packaging by using a frame to obtain the double-sided battery grid backboard glass assembly after lamination treatment.

In a preferred embodiment, the amounts of isooctanol, organic amine compound, polycarbodiimide, and silane coupling agent added in the first step are 13%, 9%, 7%, and 1%, respectively, based on the total amount of phosphite antioxidant.

In a preferred embodiment, when the battery pieces in the third step are selected, battery pieces with qualified appearance, same color and same efficiency are selected for welding.

In a preferred embodiment, the double-sided battery grid backplane glass assembly obtained by packaging in the third step is subjected to electrical property, weather resistance and PID resistance tests.

Example 2:

different from the embodiment 1, the invention provides a double-sided battery grid backboard glass assembly, and the EVA adhesive film layer 2 comprises the following raw materials in parts by weight: 75 parts of ethylene-vinyl acetate copolymer, 8 parts of polyolefin elastomer, 1.5 parts of modified phosphite ester antioxidant, 0.5 part of light stabilizer, 0.5 part of fluorescent whitening agent and 4.5 parts of first cross-linking agent; the POE adhesive film layer 4 comprises the following raw materials in parts by weight: 82 parts of graft modification POE resin, 1.8 parts of anti-aging auxiliary agent, 1 part of coupling agent, 2.5 parts of second cross-linking agent, 0.3 part of ultraviolet absorbent and 0.3 part of antioxidant.

Example 3:

different from the embodiments 1-2, the invention provides a double-sided battery grid backboard glass assembly, wherein the EVA adhesive film layer comprises the following raw materials in parts by weight: 90 parts of ethylene-vinyl acetate copolymer, 10 parts of polyolefin elastomer, 2.5 parts of modified phosphite ester antioxidant, 1 part of light stabilizer, 0.8 part of fluorescent whitening agent and 6 parts of first cross-linking agent; the POE adhesive film layer comprises the following raw materials in parts by weight: 90 parts of graft modification POE resin, 3 parts of anti-aging auxiliary agent, 1.5 parts of coupling agent, 3 parts of second cross-linking agent, 0.6 part of ultraviolet absorbent and 0.6 part of antioxidant.

Example 4:

the invention provides a double-sided battery grid backboard glass assembly which comprises a front packaging glass layer 1, an EVA (ethylene vinyl acetate) adhesive film layer 2, a battery sheet layer 3, a POE (polyolefin elastomer) adhesive film layer 4 and a grid backboard glass layer 5 which are sequentially stacked, wherein a glaze layer 6 is arranged on a light facing surface of the grid backboard glass layer 5, and antireflection films 7 are arranged on the surfaces of the battery sheet layer 3, which are in contact with the EVA adhesive film layer 2 and the POE adhesive film layer 4.

In a preferred embodiment, the EVA film layer 2 comprises the following raw materials in parts by weight: 60 parts of ethylene-vinyl acetate copolymer, 5 parts of polyolefin elastomer, 0.5 part of phosphite antioxidant, 0.1 part of light stabilizer, 0.2 part of fluorescent whitening agent and 3 parts of first cross-linking agent; the POE adhesive film layer 4 comprises the following raw materials in parts by weight: 75 parts of graft modification POE resin, 0.5 part of anti-aging auxiliary agent, 0.5 part of coupling agent, 1 part of second cross-linking agent, 0.1 part of ultraviolet absorbent and 0.1 part of antioxidant.

In a preferred embodiment, the light stabilizer is bis-2, 2,6, 6-tetramethylpiperidinol sebacate or N, N, -bis (2,2,6, 6-tetramethyl-4-piperidinyl) -1, 6-hexanediamine; the fluorescent whitening agent is 2, 5-bis (5-tert-butyl-2-benzoxazolyl) thiophene; the first cross-linking agent is a mixture of ethoxylated trimethylolpropane triacrylate and ethoxylated trimethylolpropane, and the anti-aging auxiliary agent is one of 2,2,6, 6-tetramethyl-4-piperidine stearate, salicylic acid or 2-hydroxy-4-n-octoxy benzophenone; the coupling agent is a silane coupling agent; the second cross-linking agent is a mixture of tert-butyl peroxy-2-ethyl hexyl carbonate and triallyl isocyanurate; the ultraviolet absorbent is 2-hydroxy-4-n-octoxy benzophenone, and the antioxidant is 6-tertiary butyl-4-methylphenol or bis (3, 5-tertiary butyl-4-hydroxyphenyl) thioether.

In a preferred embodiment, the glazing layer 6 has an optical reflectance of 85 to 95%, and the weight ratio of ethoxylated trimethylolpropane triacrylate to ethoxylated trimethylolpropane in the first crosslinker is 4: 1, the weight ratio of tert-butyl peroxy-2-ethyl hexanoate carbonate to triallyl isocyanurate in the second crosslinking agent is 3: 1, the grafting modification POE resin is maleic anhydride grafting modification POE resin.

The invention also provides a preparation method of the double-sided battery grid backboard glass component, which comprises the following specific preparation steps:

the method comprises the following steps: preparing an EVA adhesive film layer, namely uniformly mixing a phosphite ester antioxidant, an ethylene-vinyl acetate copolymer, a polyolefin elastomer, a modified phosphite ester antioxidant, a light stabilizer, a fluorescent whitening agent and a first cross-linking agent, placing the mixture in a double-screw extruder, heating and melting to extrude a film, and pressing, cooling and shaping the film by a compression roller and rolling to obtain the EVA adhesive film;

step two: preparing a POE adhesive film layer, namely uniformly stirring and mixing the weighed graft modified POE resin, the anti-aging auxiliary agent, the coupling agent, the second cross-linking agent, the ultraviolet absorbent and the antioxidant in parts by weight, putting the mixture into a double-screw extruder, heating and melting to extrude a film shape, and pressing the film by a compression roller, cooling and shaping the film, and rolling the film to obtain the POE adhesive film;

step three: welding the selected battery pieces by using welding strips to form a battery piece layer, then laying a front packaging glass layer, an EVA (ethylene vinyl acetate) adhesive film layer, the battery piece layer, a POE (polyolefin elastomer) adhesive film layer and a grid backboard glass layer in sequence, carrying out lamination treatment after laying, and assembling and packaging by using a frame to obtain the double-sided battery grid backboard glass assembly after lamination treatment.

In a preferred embodiment, when the battery pieces in the third step are selected, battery pieces with qualified appearance, same color and same efficiency are selected for welding.

In a preferred embodiment, the double-sided battery grid backplane glass assembly obtained by packaging in the third step is subjected to electrical property, weather resistance and PID resistance tests.

The EVA film and the POE film prepared in the above embodiments 1 to 4 are respectively taken as an experimental group 1, an experimental group 2, an experimental group 3, and an experimental group 4, the EVA film and the POE film prepared by using the conventional EVA resin and POE resin are taken as a control group, the uv-aging resistance index and the damp-heat aging resistance index of the selected EVA film and POE film are respectively detected, and the comprehensive conversion rate and the PID resistance of the double-sided photovoltaic module prepared by using the selected EVA film and POE film are tested (the back panel of the double-sided photovoltaic module prepared by using the conventional EVA resin and POE resin is a common glass back panel), and the test results are as shown in table one:

watch 1

As can be seen from the table I, compared with the traditional double-sided optical progenitor cell assembly, the double-sided cell grid backboard glass assembly has higher comprehensive conversion rate and better PID resistance, and the EVA adhesive film and the POE adhesive film used by the invention have better ultraviolet resistance and damp-heat resistance, so that the weather resistance of the double-sided photovoltaic cell assembly is improved, the double-sided cell grid backboard glass assembly prepared by adopting the raw material formula 1 has the advantages that the EVA adhesive film layer adopts the ethylene-vinyl acetate copolymer as the raw material, and is added with the polyolefin elastomer, the modified phosphite antioxidant, the light stabilizer, the fluorescent brightener and the first cross-linking agent, the weather resistance and the light transmittance of the EVA adhesive film layer can be effectively improved, the hydrolysis resistance and the stability are improved after the phosphite antioxidant is modified, the phosphite antioxidant can not only improve the weather resistance, but also has better light transmittance, the power of the photovoltaic module is improved; the POE adhesive film layer is prepared by taking graft modified POE resin as a raw material and adding an anti-aging auxiliary agent, a coupling agent, a second cross-linking agent, an ultraviolet absorbent and an antioxidant, the POE resin has good ultraviolet resistance and mechanical property after being graft modified by maleic anhydride, and the anti-aging auxiliary agent, the ultraviolet absorbent and the antioxidant can enable the POE adhesive film layer to have good weather resistance; the back plate of the double-sided battery component adopts grid back plate glass, the outer side surface of the back plate glass is in a grid shape, the glaze layer is arranged on grid lines, the glaze layer has higher reflectivity, the blank area between strings can be fully utilized, optical secondary reflection is increased, battery strings on two sides can accept more light radiation quantity, and the power of the photovoltaic component is increased.

And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.