Photovoltaic module packaging film, preparation method thereof and photovoltaic module

Abstract

The invention relates to a photovoltaic module packaging film, a preparation method thereof and a photovoltaic module. The photovoltaic module packaging film comprises a base film layer, a color grid layer and a transparent ink layer which are sequentially stacked. The photovoltaic module packaging film is prepared by arranging the colored grid layer and the transparent ink layer on the base film layer, and the thermal shrinkage rate of the photovoltaic module packaging film can be reduced, so that the probability that the photovoltaic module packaging film is wrinkled in the photovoltaic module packaging and laminating process is reduced, and the production yield and the appearance effect of the colored photovoltaic module are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solar energy, in particular to a photovoltaic module encapsulating film, a preparation method thereof and a photovoltaic module. BACKGROUND

[0002] With the rise of the consumer-level portable photovoltaic market, consumers have increasingly high requirements for the color value of photovoltaic modules, and increasingly high demands for portability, easy storage and folding, and color diversity. Generally, photovoltaic modules do not have color characteristics and are generally blue or black. In addition, the front film material of portable photovoltaic modules is generally one of ethylene-tetrafluoroethylene copolymer (ETFE) film, polyvinylidene fluoride (PVDF) film or polyvinyl fluoride (PVF) film. Due to the existence of mechanical tension in the production and manufacturing process, these materials have a certain thermal shrinkage, which can easily cause wrinkles during the module encapsulation process, thereby increasing the cost of poor encapsulation.

[0003] Therefore, it is necessary to develop a photovoltaic module encapsulating film that can be prepared in different colors and is not prone to wrinkles during the encapsulation lamination process. SUMMARY

[0004] To solve the above technical problems, the present application provides a photovoltaic module encapsulating film, a preparation method thereof and a photovoltaic module. The photovoltaic module encapsulating film can be prepared in different colors and is not prone to wrinkles during the encapsulation lamination process. The photovoltaic module prepared by encapsulation has high production yield, good appearance effect and high power.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a photovoltaic module encapsulating film, which comprises a base film layer, a color grid layer and a transparent ink layer arranged in sequence.

[0007] The present application prepares a photovoltaic module encapsulating film by arranging a color grid layer and a transparent ink layer on the base film layer, which can reduce the thermal shrinkage of the photovoltaic module encapsulating film, thereby reducing the probability of wrinkles of the photovoltaic module encapsulating film during the encapsulation lamination process of the photovoltaic module, and improving the production yield and appearance effect of the color photovoltaic module.

[0008] Preferably, the base film layer comprises a base film.

[0009] Preferably, the base film comprises any one or a combination of at least two of polyvinylidene fluoride film, ethylene-tetrafluoroethylene copolymer film or polyvinyl fluoride film, and is further preferably polyvinylidene fluoride film.

[0010] Preferably, the thickness of the base film is 20-50 μm (such as 25 μm, 30 μm, 35 μm, 40 μm or 45 μm, etc.), and is further preferably 20-35 μm.

[0011] Preferably, the surface dyne value of the base film is ≥38 dyn / cm (e.g. 40 dyn / cm, 42 dyn / cm, 44 dyn / cm, 46 dyn / cm, 48 dyn / cm or 50 dyn / cm, etc.).

[0012] In the present application, the surface dyne value of the base film can be ≥38 dyn / cm by means of corona or plasma treatment.

[0013] Preferably, the color grid layer comprises a color grid.

[0014] Preferably, the shape of the grid unit of the color grid comprises any one or a combination of at least two of a circle, a triangle, a rhombus or a hexagon.

[0015] Illustratively, the rhombus comprises a square.

[0016] Preferably, the frame of the grid unit is a color developing area, and the area between the frames is a light transmitting area.

[0017] Preferably, the area ratio of the light transmitting area in the color grid is 50% to 70% (e.g. 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66% or 68%, etc.).

[0018] In the present application, the area ratio of the light transmitting area is preferably 50% to 70%. If the area ratio of the light transmitting area is too small, the grid is denser, the light shielding is increased, the light transmission rate is too low, which can be <80%, resulting in a large power loss of the photovoltaic module, which can be >20%, the power generation efficiency experience is poor; if the area ratio of the light transmitting area is too large, the area between the frames of the grid is large, the appearance effect and color covering effect are poor, and it is difficult to achieve a beautiful and consistent effect.

[0019] Preferably, the thickness of the color grid is 5 to 10 μm, e.g. 6 μm, 7 μm, 8 μm or 9 μm, etc.

[0020] Preferably, the frame of the grid unit is made of color ink.

[0021] Preferably, the color ink comprises the following components by weight parts: acrylate prepolymer 45-60 parts (e.g. 47 parts, 49 parts, 51 parts, 53 parts, 55 parts, 57 parts, or 59 parts, etc.), reactive diluent 15-20 parts (e.g. 15.5 parts, 16 parts, 16.5 parts, 17 parts, 17.5 parts, 18 parts, 18.5 parts, 19 parts, or 19.5 parts, etc.), photoinitiator A 10-15 parts (e.g. 10.5 parts, 11 parts, 11.5 parts, 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts, or 14.5 parts, etc.), leveling agent 0.5-1 parts (e.g. 0.55 parts, 0.6 parts, 0.65 parts, 0.7 parts, 0.75 parts, 0.8 parts, 0.85 parts, 0.9 parts, or 0.95 parts, etc.), and pigment 5-15 parts (e.g. 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, or 14 parts, etc.).

[0022] In the present application, the color ink has a fast curing speed, for example, the curing can be completed in 1-3 seconds, a high crosslinking density, a hardness of 4H, and good weather resistance and heat resistance.

[0023] Preferably, the number average molecular weight of the acrylate prepolymer is 2000-5000, for example, 2500, 3000, 3500, 4000, or 4500, etc.

[0024] Illustratively, the acrylate prepolymer comprises polyurethane acrylate (PUA), which is commercially available from Shenzhen Youyang Technology Co., Ltd., and the model number is T-7006.

[0025] Preferably, the reactive diluent comprises a multifunctional acrylate monomer.

[0026] Preferably, the multifunctional acrylate monomer comprises trimethylolpropane triacrylate (TMPTA) and / or dipentaerythritol hexaacrylate (DPHA).

[0027] Preferably, the photoinitiator A comprises a free radical type photoinitiator.

[0028] Preferably, the free radical type photoinitiator comprises 1-hydroxycyclohexyl phenyl ketone and / or 2-hydroxy-2-methyl-1-phenyl-1-propanone (photoinitiator 1173).

[0029] Preferably, the leveling agent comprises a silicone-based leveling agent.

[0030] In the present application, the leveling agent in the color ink is preferably a silicone leveling agent, which can improve the leveling property, prevent the generation of shrinkage holes, make the film surface flat, increase the gloss of the color ink printing, greatly reduce the surface tension of the color ink, and improve the spreading property of the color ink on the base film surface. Exemplarily, the silicone leveling agent includes leveling agent BYK-333.

[0031] Preferably, the pigment includes a pearlescent pigment.

[0032] Preferably, the particle size of the pearlescent pigment is 10-45 μm, such as 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, or 40 μm, etc.

[0033] Exemplarily, the pigment includes any one or a combination of at least two of Kuncai KS1111 silver white, Kuncai Wavemaster T20-23 star blue, Kuncai KC4418 crystal red, Kuncai KC4435 greenish blue, or Kuncai KC4405 autumn chrysanthemum yellow, which are purchased from Xiamen Kuncai Pigment Co., Ltd. By selecting pigments of different colors, color inks of different colors can be prepared.

[0034] In the present application, in order to facilitate coating printing, the pattern and color of the color grid can be set on a computer using Adobe Illustrator or Photoshop professional software, the file resolution range is set to 150-300 DPI, and the color mode is selected as CMKY mode. CMYK is a printing color mode based on ink mixing, which is formed by superimposing cyan (Cyan), magenta (Magenta), yellow (Yellow), and black (Black) colors. Exemplarily, the pigment in the cyan color ink can be selected as Kuncai Wavemaster T20-23 star blue, the pigment in the magenta color ink can be selected as Kuncai KC4418 crystal red, the pigment in the yellow color ink can be selected as Kuncai KC4405 autumn chrysanthemum yellow, and the pigment in the black color ink can be selected as Kuncai KS1111 silver white.

[0035] Preferably, the transparent ink layer is made of transparent ink.

[0036] Preferably, the transparent ink includes the following components by weight fraction: carbon-carbon double bond-containing resin 50-60 parts (such as 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, or 59 parts, etc.), acrylate monomer 15-30 parts (such as 17 parts, 19 parts, 21 parts, 23 parts, 25 parts, or 27 parts, etc.), and photoinitiator B 10-15 parts (such as 10.5 parts, 11 parts, 11.5 parts, 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts, or 14.5 parts, etc.).

[0037] Preferably, the resin containing carbon-carbon double bonds includes resins containing carbon-carbon double bonds with a functionality of 2 to 6 (e.g., 3, 4, or 5).

[0038] Preferably, the resin containing carbon-carbon double bonds includes any one or a combination of at least two of polyester acrylate resin, epoxy acrylate resin, or polyurethane acrylate resin.

[0039] Preferably, the acrylate monomers include any one or a combination of at least two of 1,6-hexanediol diacrylate (HDDA), dipropylene glycol diacrylate (DPGDA), or tripropylene glycol diacrylate (TPGDA).

[0040] Preferably, the photoinitiator B comprises a free radical photoinitiator and / or a cationic photoinitiator.

[0041] Preferably, the photoinitiator B comprises any one or a combination of at least two of benzoin, benzoin ether, or benzoin diether.

[0042] In this invention, the transparent ink has a fast curing speed and can be cured in 1 to 5 seconds under a UV lamp (wavelength of 200~400 nm) to form a hard film layer.

[0043] Preferably, the thickness of the transparent ink layer is greater than or equal to the thickness of the colored grid.

[0044] Preferably, the thickness of the transparent ink layer is 10~30 μm (e.g., 12 μm, 14 μm, 16 μm, 18 μm, 20 μm, 22 μm, 24 μm, 26 μm or 28 μm, etc.), and more preferably 15~20 μm.

[0045] In this invention, the thickness of the transparent ink layer is preferably 15-20 μm. This ensures good coverage of the colored grid, protecting the grid layer and reducing the risk of pitting after lamination, thus minimizing the risk of pitting lift and delamination during reliability testing. The thickness of the transparent ink layer includes the thickness of the portion embedded within the colored grid and the thickness of the portion outside the grid. If the transparent ink layer is too thin, the coverage of the colored grid layer will be incomplete, resulting in poor protection. If the transparent ink layer is too thick, problems such as excessively long UV curing time or poor curing effect may occur.

[0046] In a second aspect, the present invention provides a method for preparing a photovoltaic module encapsulation film as described in the first aspect, the method comprising the following steps: printing colored ink on a base film layer to form a colored grid layer, and then printing transparent ink on the colored grid layer to form a transparent ink layer, thereby obtaining the photovoltaic module encapsulation film.

[0047] In this invention, both the transparent ink and the colored ink are photocurable inks, and the colored grid layer and the transparent ink layer are made using photocurable ink printing technology, which results in high color saturation, fast curing speed, and high production efficiency.

[0048] Thirdly, the present invention provides a photovoltaic module, the photovoltaic module comprising a front film, a first encapsulating film, a front encapsulation plate, a second encapsulating film, a battery string, a third encapsulating film, a rear encapsulation plate, a fourth encapsulating film and a rear film stacked sequentially; the front film and the rear film each independently comprise the photovoltaic module encapsulation film as described in the first aspect.

[0049] Preferably, the photovoltaic module includes a portable photovoltaic module.

[0050] In this invention, the photovoltaic module encapsulation film of the front and rear films can have either a base film layer side as the light-incident surface or a transparent ink layer side as the light-incident surface. When the base film layer side is the light-incident surface, the transparent ink layer side is in contact with the encapsulation film, which can prevent the encapsulation film from contacting the colored grid layer during the melting process, thus preventing the colored grid layer pattern from becoming blurred or the color from being distorted. When the transparent ink layer side is the light-incident surface, the transparent ink layer can prevent the colored grid layer from directly contacting the outside world, avoiding scratches and peeling off of the colored grid layer pattern, and reducing aging and discoloration due to sun exposure.

[0051] Preferably, the thickness of the first encapsulating film and the fourth encapsulating film are each independently 0.3~0.7 mm, for example 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm or 0.65 mm.

[0052] Preferably, the thickness of the second encapsulating film and the third encapsulating film are each independently 0.5~0.7 mm, for example 0.52 mm, 0.54 mm, 0.56 mm, 0.58 mm, 0.6 mm, 0.62 mm, 0.64 mm, 0.66 mm or 0.68 mm, etc.

[0053] Preferably, the thickness of each of the front packaging plates is independently 0.3~0.5 mm, for example 0.32 mm, 0.34 mm, 0.36 mm, 0.38 mm, 0.40 mm, 0.42 mm, 0.44 mm, 0.46 mm or 0.48 mm.

[0054] Preferably, the first encapsulating film and the fourth encapsulating film each independently comprise any one or a combination of at least two of EVA film, POE film, or EPE co-extruded film (EVA / POE / EVA co-extruded film).

[0055] Preferably, the second encapsulating film and the third encapsulating film each independently comprise a POE film.

[0056] Preferably, the front and rear packaging plates each independently comprise a PET film and / or a CPC film.

[0057] Preferably, the battery string comprises XBC batteries.

[0058] Preferably, the battery string includes battery cells, which are made of 1 / 2 slices, 1 / 4 slices or 1 / 6 slices, and are welded into a battery string, which is connected to the entire photovoltaic module through a busbar.

[0059] Compared with the prior art, the present invention has at least the following beneficial effects:

[0060] This invention creates a photovoltaic module encapsulation film by setting a colored grid layer and a transparent ink layer on a base film layer. This reduces the thermal shrinkage rate of the photovoltaic module encapsulation film, thereby reducing the probability of wrinkles generated during the photovoltaic module encapsulation lamination process and improving the production yield and appearance of the photovoltaic module. The photovoltaic module encapsulation film has a MD thermal shrinkage rate ≤2%, a TD thermal shrinkage rate ≤2%, and a light transmittance loss ≤12%. By setting the colored grid layer, the photovoltaic module encapsulation film can achieve a vibrant color appearance while ensuring that the power loss of the photovoltaic module is ≤20%, and preferably, the power loss of the photovoltaic module is ≤10%. Attached Figure Description

[0061] Figure 1 This is a schematic diagram of the cross-sectional structure of the photovoltaic module encapsulation film provided in Example 1;

[0062] Among them, 1-base film layer, 2-colored mesh layer, 3-transparent ink layer;

[0063] Figure 2 This is a schematic diagram of the structure of the colored grid in Example 1;

[0064] Among them, 4 is the color rendering area, and 5 is the light-transmitting area;

[0065] Figure 3 A schematic diagram showing the effect of the colors set for the CMKY values ​​in Examples 1-13 and Comparative Example 2;

[0066] Figure 4 This is a schematic diagram of the pattern effect of the front film of the portable photovoltaic module in Example 4. Detailed Implementation

[0067] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0068] Unless otherwise specified, the materials and equipment involved in the following detailed embodiments are all conventional materials and equipment in the art and will not affect the technical effects of the present invention.

[0069] Example 1

[0070] This embodiment provides a photovoltaic module encapsulation film, its preparation method, and a portable photovoltaic module, such as... Figure 1 As shown, the photovoltaic module encapsulation film includes a base film layer 1, a colored grid layer 2, and a transparent ink layer 3 stacked sequentially.

[0071] The method for preparing the photovoltaic module encapsulation film includes the following steps:

[0072] (1) Colored Grid Design: Use Adobe Illustrator professional software on a computer to complete the setting of the colored grid pattern and colors. The grid cells of the colored grid are square with a side length of 1 mm, such as... Figure 2 As shown, the border of the colored grid is the color display area 4, which accounts for 45% of the area. The area between the borders is the light transmission area 5, which accounts for 55% of the area. The CMKY value is set to 0,0,0,10.

[0073] (2) Prepare colored inks:

[0074] Colored ink C: 50 parts by weight of acrylate prepolymer (polyurethane acrylate, model T-7006, purchased from Shenzhen Youyang Technology Co., Ltd.), 18 parts by weight of reactive diluent (trimethylolpropane triacrylate), 12 parts by weight of photoinitiator A (1-hydroxycyclohexylphenyl ketone), 0.8 parts by weight of leveling agent (leveling agent BYK-333), and 8 parts by weight of pigment (Kuncai Wavemaster T20-23 Starry Sky Blue) are mixed to obtain colored ink C.

[0075] Color ink M: 50 parts by weight of acrylate prepolymer (polyurethane acrylate, model T-7006, purchased from Shenzhen Youyang Technology Co., Ltd.), 18 parts by weight of reactive diluent (trimethylolpropane triacrylate), 12 parts by weight of photoinitiator A (1-hydroxycyclohexylphenyl ketone), 0.8 parts by weight of leveling agent (leveling agent BYK-333) and 8 parts by weight of pigment (Kuncai KC4418 crystal red) are mixed to obtain color ink M.

[0076] Color ink K: 50 parts by weight of acrylate prepolymer (polyurethane acrylate, model T-7006, purchased from Shenzhen Youyang Technology Co., Ltd.), 18 parts by weight of reactive diluent (trimethylolpropane triacrylate), 12 parts by weight of photoinitiator A (1-hydroxycyclohexylphenyl ketone), 0.8 parts by weight of leveling agent (leveling agent BYK-333) and 8 parts by weight of pigment (Kuncai KC4405 chrysanthemum yellow) are mixed to obtain color ink K.

[0077] Colored ink Y: 50 parts by weight of acrylate prepolymer (polyurethane acrylate, model T-7006, purchased from Shenzhen Youyang Technology Co., Ltd.), 18 parts by weight of reactive diluent (trimethylolpropane triacrylate), 12 parts by weight of photoinitiator A (1-hydroxycyclohexylphenyl ketone), 0.8 parts by weight of leveling agent (leveling agent BYK-333), and 8 parts by weight of pigment (Kuncai KS1111 silver white) are mixed to obtain colored ink Y.

[0078] (3) Prepare transparent ink:

[0079] The transparent ink comprises the following components by weight: 55 parts of a resin containing carbon-carbon double bonds (polyester acrylic resin, model CR94131, manufactured by Guangdong Haohui New Materials Co., Ltd.), 25 parts of an acrylate monomer (1,6-hexanediol diacrylate, model MR1201-TF, manufactured by Guangdong Haohui New Materials Co., Ltd.), and 13 parts of photoinitiator B (model 8266, manufactured by Guangdong Haohui New Materials Co., Ltd.).

[0080] (4) Select a PVDF film with a thickness of 30 μm and a width of 600 mm, and subject the PVDF film to corona treatment so that its surface dyn value is 38 dyn / cm;

[0081] A UV printer containing color inks C, M, K and Y prepared in step (2) was used to print a color grid on the surface of a corona-treated PVDF film according to the color grid design in step (1). The UV (wavelength 365 nm) lamp was used to irradiate for 3 seconds to complete the photocuring. The thickness of the printed color grid was 8 μm.

[0082] Then, a UV printer with the transparent ink prepared in step (3) was used to print on the colored grid. The UV (wavelength 365 nm) lamp was used to irradiate for 5 seconds to complete the photocuring, forming a transparent ink layer with a thickness of 20 μm, and thus a photovoltaic module encapsulation film was prepared.

[0083] The portable photovoltaic module includes a front film, a first encapsulating film, a front encapsulation plate, a second encapsulating film, a battery string, a third encapsulating film, a rear encapsulation plate, a fourth encapsulating film, and a rear film, which are stacked sequentially. The front film and the rear film are both encapsulation films for the photovoltaic module. One side of the base film layer in the front film contacts the first encapsulating film, and one side of the base film layer in the rear film contacts the fourth encapsulating film. The first, second, third, and fourth encapsulating films are all 0.5 mm thick POE films. The front encapsulation plate is a PET film. The rear encapsulation plate is a CPC film. The battery string includes XBC batteries. The battery string is formed by welding together 1 / 2 sliced ​​battery cells and is connected to the entire portable photovoltaic module via busbars.

[0084] Example 2

[0085] This embodiment provides a photovoltaic module encapsulation film, its preparation method, and a portable photovoltaic module. The photovoltaic module encapsulation film includes a base film layer, a colored grid layer, and a transparent ink layer stacked sequentially.

[0086] The method for preparing the photovoltaic module encapsulation film includes the following steps:

[0087] (1) Color grid design: Use Adobe Illustrator professional software on the computer to complete the color grid pattern and color settings. The grid cell of the color grid is square with a side length of 2 mm. The border of the color grid is the color display area, and the area of ​​the color display area accounts for 40%. The area between the borders is the light transmission area, and the area of ​​the light transmission area accounts for 60%. The CMKY value is set to 0,0,0,10.

[0088] (2) Prepare colored inks:

[0089] Colored Ink C: 45 parts by weight of acrylate prepolymer (polyurethane acrylate, model T-7006, purchased from Shenzhen Youyang Technology Co., Ltd.), 20 parts by weight of reactive diluent (trimethylolpropane triacrylate), 10 parts by weight of photoinitiator A (1-hydroxycyclohexylphenyl ketone), 0.5 parts by weight of leveling agent (leveling agent BYK-333), and 5 parts by weight of pigment (Kuncai Wavemaster T20-23 Starry Sky Blue) are mixed to obtain colored ink C.

[0090] Color ink M: 45 parts by weight of acrylate prepolymer (polyurethane acrylate, model T-7006, purchased from Shenzhen Youyang Technology Co., Ltd.), 20 parts by weight of reactive diluent (trimethylolpropane triacrylate), 10 parts by weight of photoinitiator A (1-hydroxycyclohexylphenyl ketone), 0.5 parts by weight of leveling agent (leveling agent BYK-333), and 5 parts by weight of pigment (Kuncai KC4418 crystal red) are mixed to obtain color ink M.

[0091] Color ink K: 45 parts by weight of acrylate prepolymer (polyurethane acrylate, model T-7006, purchased from Shenzhen Youyang Technology Co., Ltd.), 20 parts by weight of reactive diluent (trimethylolpropane triacrylate), 10 parts by weight of photoinitiator A (1-hydroxycyclohexylphenyl ketone), 0.5 parts by weight of leveling agent (leveling agent BYK-333), and 5 parts by weight of pigment (Kuncai KC4405 chrysanthemum yellow) are mixed to obtain color ink K.

[0092] Colored ink Y: 45 parts by weight of acrylate prepolymer (polyurethane acrylate, model T-7006, purchased from Shenzhen Youyang Technology Co., Ltd.), 20 parts by weight of reactive diluent (trimethylolpropane triacrylate), 10 parts by weight of photoinitiator A (1-hydroxycyclohexylphenyl ketone), 0.5 parts by weight of leveling agent (leveling agent BYK-333), and 5 parts by weight of pigment (Kuncai KS1111 silver white) are mixed to obtain colored ink Y.

[0093] (3) Prepare transparent ink:

[0094] The transparent ink comprises the following components by weight: 60 parts of a resin containing carbon-carbon double bonds (polyester acrylic resin, model CR94131, manufactured by Guangdong Haohui New Materials Co., Ltd.), 15 parts of an acrylate monomer (1,6-hexanediol diacrylate, model MR1201-TF, manufactured by Guangdong Haohui New Materials Co., Ltd.), and 10 parts of photoinitiator B (model 8266, manufactured by Guangdong Haohui New Materials Co., Ltd.).

[0095] (4) Select a PVDF film with a thickness of 25 μm and a width of 600 mm, and subject the PVDF film to corona treatment so that its surface dyn value is 38 dyn / cm;

[0096] A UV printer containing color inks C, M, K and Y prepared in step (2) was used to print a color grid on the surface of a corona-treated PVDF film according to the color grid design in step (1). The UV (wavelength 365 nm) lamp was used to irradiate for 3 seconds to complete the photocuring. The thickness of the printed color grid was 5 μm.

[0097] Then, a UV printer with the transparent ink prepared in step (3) is used to print on the colored grid. The UV (wavelength 365 nm) lamp is used to irradiate for 5 seconds to complete the photocuring, forming a transparent ink layer with a thickness of 10 μm, and thus a photovoltaic module encapsulation film is prepared.

[0098] The portable photovoltaic module includes a front film, a first encapsulating film, a front encapsulation plate, a second encapsulating film, a battery string, a third encapsulating film, a rear encapsulation plate, a fourth encapsulating film, and a rear film, which are stacked sequentially. The front film and the rear film are both encapsulation films for the photovoltaic module. One side of the base film layer in the front film contacts the first encapsulating film, and one side of the base film layer in the rear film contacts the fourth encapsulating film. The first, second, third, and fourth encapsulating films are all 0.5 mm thick POE films. The front encapsulation plate is a PET film. The rear encapsulation plate is a CPC film. The battery string includes XBC batteries. The battery string is formed by welding together 1 / 2 sliced ​​battery cells and is connected to the entire portable photovoltaic module via busbars.

[0099] Example 3

[0100] This embodiment provides a photovoltaic module encapsulation film, its preparation method, and a portable photovoltaic module. The photovoltaic module encapsulation film includes a base film layer, a colored grid layer, and a transparent ink layer stacked sequentially.

[0101] The method for preparing the photovoltaic module encapsulation film includes the following steps:

[0102] (1) Color grid design: Use Adobe Illustrator professional software on the computer to complete the color grid pattern and color settings. The grid cell of the color grid is square with a side length of 5 mm. The border of the color grid is the color display area, and the area of ​​the color display area accounts for 30%. The area between the borders is the light transmission area, and the area of ​​the light transmission area accounts for 70%. The CMKY value is set to 0,0,0,10.

[0103] (2) Prepare colored inks:

[0104] Colored Ink C: 60 parts by weight of acrylate prepolymer (polyurethane acrylate, model T-7006, purchased from Shenzhen Youyang Technology Co., Ltd.), 15 parts by weight of reactive diluent (dipentaerythritol hexaacrylate), 15 parts by weight of photoinitiator A (2-hydroxy-2-methyl-1-phenyl-1-propanone), 1 part by weight of leveling agent (leveling agent BYK-333), and 10 parts by weight of pigment (KunCai Wavemaster T20-23 Starry Sky Blue) are mixed to obtain colored ink C.

[0105] Colored ink M: 60 parts by weight of acrylate prepolymer (polyurethane acrylate, model T-7006, purchased from Shenzhen Youyang Technology Co., Ltd.), 15 parts by weight of reactive diluent (dipentaerythritol hexaacrylate), 15 parts by weight of photoinitiator A (2-hydroxy-2-methyl-1-phenyl-1-propanone), 1 part by weight of leveling agent (leveling agent BYK-333), and 10 parts by weight of pigment (Kuncai KC4418 crystal red) are mixed to obtain colored ink M.

[0106] Colored ink K: 60 parts by weight of acrylate prepolymer (polyurethane acrylate, model T-7006, purchased from Shenzhen Youyang Technology Co., Ltd.), 15 parts by weight of reactive diluent (dipentaerythritol hexaacrylate), 15 parts by weight of photoinitiator A (2-hydroxy-2-methyl-1-phenyl-1-propanone), 1 part by weight of leveling agent (leveling agent BYK-333), and 10 parts by weight of pigment (Kuncai KC4405 chrysanthemum yellow) are mixed to obtain colored ink K.

[0107] Colored ink Y: 60 parts by weight of acrylate prepolymer (polyurethane acrylate, model T-7006, purchased from Shenzhen Youyang Technology Co., Ltd.), 15 parts by weight of reactive diluent (dipentaerythritol hexaacrylate), 15 parts by weight of photoinitiator A (2-hydroxy-2-methyl-1-phenyl-1-propanone), 1 part by weight of leveling agent (leveling agent BYK-333), and 10 parts by weight of pigment (Kuncai KS1111 silver white) are mixed to obtain colored ink Y.

[0108] (3) Prepare transparent ink:

[0109] The transparent ink comprises the following components by weight: 50 parts of a resin containing carbon-carbon double bonds (polyester acrylic resin, model CR94131, manufactured by Guangdong Haohui New Materials Co., Ltd.), 30 parts of an acrylate monomer (1,6-hexanediol diacrylate, model MR1201-TF, manufactured by Guangdong Haohui New Materials Co., Ltd.), and 15 parts of photoinitiator B (model 8266, manufactured by Guangdong Haohui New Materials Co., Ltd.).

[0110] (4) Select a PVDF film with a thickness of 45 μm and a width of 600 mm, and subject the PVDF film to corona treatment so that its surface dyn value is 38 dyn / cm;

[0111] A UV printer containing color inks C, M, K and Y prepared in step (2) was used to print a color grid on the surface of a corona-treated PVDF film according to the color grid design in step (1). The UV (wavelength 365 nm) lamp was used to irradiate for 3 seconds to complete the photocuring. The thickness of the printed color grid was 10 μm.

[0112] Then, a UV printer with the transparent ink prepared in step (3) is used to print on the colored grid. The UV (wavelength 365 nm) lamp is used to irradiate for 5 seconds to complete the photocuring, forming a transparent ink layer with a thickness of 30 μm, thus preparing the photovoltaic module encapsulation film.

[0113] The portable photovoltaic module includes a front film, a first encapsulating film, a front encapsulation plate, a second encapsulating film, a battery string, a third encapsulating film, a rear encapsulation plate, a fourth encapsulating film, and a rear film, which are stacked sequentially. The front film and the rear film are both encapsulation films for the photovoltaic module. One side of the base film layer in the front film contacts the first encapsulating film, and one side of the base film layer in the rear film contacts the fourth encapsulating film. The first, second, third, and fourth encapsulating films are all 0.5 mm thick POE films. The front encapsulation plate is a PET film. The rear encapsulation plate is a CPC film. The battery string includes XBC batteries. The battery string is formed by welding together 1 / 2 sliced ​​battery cells and is connected to the entire portable photovoltaic module via busbars.

[0114] Example 4

[0115] This embodiment provides a photovoltaic module encapsulation film, its preparation method, and a portable photovoltaic module. The difference between this embodiment and Embodiment 1 is that the CMKY value is set to 0,100,100,0, while other conditions are the same as in Embodiment 1.

[0116] Example 5

[0117] This embodiment provides a photovoltaic module encapsulation film, its preparation method, and a portable photovoltaic module. The difference between this embodiment and Embodiment 1 is that the CMKY value is set to 0, 55, 50, 0, while other conditions are the same as in Embodiment 1.

[0118] Example 6

[0119] This embodiment provides a photovoltaic module encapsulation film, its preparation method, and a portable photovoltaic module. The difference between this embodiment and Embodiment 1 is that the CMKY value is set to 0, 25, 40, 0, while other conditions are the same as in Embodiment 1.

[0120] Example 7

[0121] This embodiment provides a photovoltaic module encapsulation film, its preparation method, and a portable photovoltaic module. The difference between this embodiment and Embodiment 1 is that the CMKY value is set to 0,0,0,35, while other conditions are the same as in Embodiment 1.

[0122] Example 8

[0123] This embodiment provides a photovoltaic module encapsulation film, its preparation method, and a portable photovoltaic module. The difference between this embodiment and Embodiment 1 is that the CMKY value is set to 85,50,0,0, while other conditions are the same as in Embodiment 1.

[0124] Example 9

[0125] This embodiment provides a photovoltaic module encapsulation film, its preparation method, and a portable photovoltaic module. The difference between this embodiment and Embodiment 1 is that the CMKY value is set to 35,0,60,0, while other conditions are the same as in Embodiment 1.

[0126] Example 10

[0127] This embodiment provides a photovoltaic module encapsulation film, its preparation method, and a portable photovoltaic module. The difference between this embodiment and Embodiment 1 is that the area ratio of the light-transmitting area is adjusted to 50%, while other conditions are the same as in Embodiment 1.

[0128] Example 11

[0129] This embodiment provides a photovoltaic module encapsulation film, its preparation method, and a portable photovoltaic module. The difference between this embodiment and Embodiment 1 is that the area ratio of the light-transmitting area is adjusted to 40%, while other conditions are the same as in Embodiment 1.

[0130] Example 12

[0131] This embodiment provides a photovoltaic module encapsulation film, its preparation method, and a portable photovoltaic module. The difference between this embodiment and Embodiment 1 is that the resin containing carbon-carbon double bonds (polyester acrylic resin, model CR94131, manufactured by Guangdong Haohui New Material Co., Ltd.) is replaced with the same mass of resin containing carbon-carbon double bonds (epoxy acrylic resin, model CR94271, manufactured by Guangdong Haohui New Material Co., Ltd.), while other conditions are the same as in Embodiment 1.

[0132] Example 13

[0133] This embodiment provides a photovoltaic module encapsulation film, its preparation method, and a portable photovoltaic module. The difference between this embodiment and Embodiment 1 is that the resin containing carbon-carbon double bonds (polyester acrylic resin, model CR94131, manufactured by Guangdong Haohui New Material Co., Ltd.) is replaced with the same mass of resin containing carbon-carbon double bonds (polyurethane acrylic resin, model CR92351, manufactured by Guangdong Haohui New Material Co., Ltd.), while other conditions are the same as in Embodiment 1.

[0134] Comparative Example 1

[0135] This comparative example provides a photovoltaic module encapsulation film and a portable photovoltaic module. The photovoltaic module encapsulation film is a PVDF film with a thickness of 30 μm and a width of 600 mm.

[0136] The portable photovoltaic module includes a front film, a first encapsulating film, a front encapsulation plate, a second encapsulating film, a battery string, a third encapsulating film, a rear encapsulation plate, a fourth encapsulating film, and a rear film stacked sequentially. The front and rear films are both photovoltaic module encapsulation films. The first, second, third, and fourth encapsulating films are all 0.5 mm thick POE films. The front encapsulation plate is a PET film. The rear encapsulation plate is a CPC film. The battery string includes XBC batteries. The battery string is formed by welding together 1 / 2 sliced ​​battery cells and is connected to the entire portable photovoltaic module via busbars.

[0137] Comparative Example 2

[0138] This comparative example provides a photovoltaic module encapsulation film and its preparation method, as well as a portable photovoltaic module. The difference between this example and Example 1 is that the colored grid layer is replaced with a colored film layer.

[0139] Step (1) is adjusted as follows: Use Adobe Illustrator professional software on the computer to complete the color settings, and set the CMKY value to 0,0,0,10;

[0140] Step (4) is adjusted as follows: Select a PVDF film with a thickness of 30 μm and a width of 600 mm, and subject the PVDF film to corona treatment so that its surface dyn value is 38 dyn / cm;

[0141] A UV printer with added colored inks C, M, K and Y obtained in step (2) was used to print on the PVDF film surface after corona treatment according to the color settings in step (1). UV (wavelength 365nm) lamp was used to irradiate for 3 seconds to complete photocuring and form a colored film layer with a thickness of 8 μm.

[0142] Then, a UV printer with the transparent ink obtained in step (3) is used to print on the colored film layer. UV (wavelength 365 nm) lamp is used to irradiate for 5 seconds to complete the photocuring, forming a transparent ink layer with a thickness of 12 μm, and thus a photovoltaic module encapsulation film is prepared.

[0143] Other conditions are the same as in Example 1.

[0144] The following performance tests were conducted on the photovoltaic module encapsulation films provided in Examples 1-13 and Comparative Examples 1-2.

[0145] (1) Heat shrinkage rate: The test was conducted in accordance with the GB / T 12027-2004 test standard. Three parallel samples were tested in each group, and the effective values ​​were recorded and averaged.

[0146] (2) Light transmittance: The test was conducted in accordance with the GB / T 29848-2013 test standard. Three parallel samples were tested in each group, and the effective values ​​were recorded and averaged.

[0147] The percentage reduction in transmittance of the photovoltaic module encapsulation film provided in Examples 1-13 and Comparative Example 2 compared to the transmittance of the PVDF film used therein is denoted as transmittance loss.

[0148] The test results are shown in Table 1.

[0149] The portable photovoltaic modules provided in Examples 1-13 and Comparative Examples 1-2 were tested as follows.

[0150] (1) Power: Tested under the standard test conditions for photovoltaic module performance, the standard test condition is 1000W / m 2 The irradiance, device temperature 25°C, and the spectrum of AM1.5G as defined by the IEC 60904-3 standard.

[0151] (2) Yield: 1,000 portable photovoltaic modules were produced on a trial basis. The appearance of the front film was observed for abnormal phenomena such as wrinkles and dents. The IV surface and EL image were tested, and the production yield was calculated.

[0152] The test results are shown in Table 2.

[0153] Table 1

[0154]

[0155] In Table 1, " / " indicates that the test was not performed.

[0156] Table 2

[0157]

[0158] In Table 2, " / " indicates that the test was not performed.

[0159] According to the test results in Table 1, the photovoltaic module encapsulation films provided in Examples 1-13 have an MD thermal shrinkage rate ≤2%, a TD thermal shrinkage rate ≤2%, and a light transmittance loss ≤12%. They can be prepared in different colors and are not prone to wrinkling during the encapsulation lamination process, with minimal impact on power. The color effects of the CMKY value settings in Examples 1-13 and Comparative Example 2 are as follows: Figure 3 As shown.

[0160] Compared with Example 1, if the area ratio of the light-transmitting area in the colored grid is too low (Example 11), the light transmittance of the photovoltaic module encapsulation film prepared will decrease.

[0161] Compared with Example 1, if the colored grid layer and transparent ink layer are not provided (Comparative Example 1), the photovoltaic module encapsulation film is transparent, colorless, has a high thermal shrinkage rate, and is prone to wrinkles during the encapsulation lamination process.

[0162] Compared with Example 1, if the colored grid layer is replaced with a colored film layer (Comparative Example 2), the light transmittance of the photovoltaic module encapsulation film prepared is greatly reduced, and the power loss of the portable photovoltaic module is large.

[0163] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A photovoltaic module encapsulation film, characterized in that, The photovoltaic module encapsulation film includes a base film layer, a colored grid layer, and a transparent ink layer stacked sequentially.

2. The photovoltaic module encapsulation film according to claim 1, characterized in that, The base film layer includes a base film; Preferably, the base film comprises any one or a combination of at least two of polyvinylidene fluoride film, ethylene-tetrafluoroethylene copolymer film, or polyvinyl fluoride film; Preferably, the thickness of the base film is 20~50 μm; Preferably, the surface dyne value of the base film is ≥38 dyn / cm.

3. The photovoltaic module encapsulation film according to claim 1 or 2, characterized in that, The colored grid layer includes a colored grid; Preferably, the shape of the grid cells of the colored grid includes any one or a combination of at least two of the following: circles, triangles, rhombuses, or hexagons; Preferably, the border of the grid unit is a color-revealing area, and the area between the borders is a light-transmitting area; Preferably, the area of ​​the light-transmitting zone in the colored grid accounts for 50% to 70%; Preferably, the thickness of the colored grid is 5~10 μm.

4. The photovoltaic module encapsulation film according to claim 3, characterized in that, The borders of the grid cells are made of colored ink; Preferably, the colored ink comprises the following components by weight: 45-60 parts of acrylate prepolymer, 15-20 parts of reactive diluent, 10-15 parts of photoinitiator A, 0.5-1 part of leveling agent, and 5-15 parts of pigment.

5. The photovoltaic module encapsulation film according to claim 4, characterized in that, The number-average molecular weight of the acrylate prepolymer is 2000-5000; Preferably, the acrylate prepolymer comprises polyurethane acrylate; Preferably, the reactive diluent comprises a multifunctional acrylate monomer; Preferably, the multifunctional acrylate monomer comprises trimethylolpropane triacrylate and / or dipentaerythritol hexaacrylate; Preferably, the photoinitiator A comprises a free radical photoinitiator; Preferably, the free radical photoinitiator comprises 1-hydroxycyclohexylphenyl ketone and / or 2-hydroxy-2-methyl-1-phenyl-1-propanone; Preferably, the leveling agent includes an organosilicon leveling agent; Preferably, the pigment includes pearlescent pigment; Preferably, the pearlescent pigment has a particle size of 10~45 μm.

6. The photovoltaic module encapsulation film according to any one of claims 1 to 5, characterized in that, The transparent ink layer is made of transparent ink; Preferably, the transparent ink comprises the following components by weight: 50-60 parts of a resin containing carbon-carbon double bonds, 15-30 parts of an acrylate monomer, and 10-15 parts of photoinitiator B.

7. The photovoltaic module encapsulation film according to claim 6, characterized in that, The carbon-carbon double bond-containing resin includes carbon-carbon double bond-containing resins with 2 to 6 functionalities. Preferably, the resin containing carbon-carbon double bonds includes any one or a combination of at least two of polyester acrylate resin, epoxy acrylate resin, or polyurethane acrylate resin; Preferably, the acrylate monomers include any one or a combination of at least two of 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, or tripropylene glycol diacrylate. Preferably, the photoinitiator B comprises a free radical photoinitiator and / or a cationic photoinitiator; Preferably, the photoinitiator B comprises any one or a combination of at least two of benzoin, benzoin ether, or benzoin diether; Preferably, the thickness of the transparent ink layer is greater than or equal to the thickness of the colored grid. Preferably, the thickness of the transparent ink layer is 10~30 μm, more preferably 15~20 μm.

8. A method for preparing a photovoltaic module encapsulation film as described in any one of claims 1 to 7, characterized in that, The preparation method includes the following steps: printing colored ink on a base film layer to form a colored grid layer, and then printing transparent ink on the colored grid layer to form a transparent ink layer, thereby obtaining the photovoltaic module encapsulation film.

9. A photovoltaic module, characterized in that, The photovoltaic module includes a front film, a first encapsulating film, a front encapsulation plate, a second encapsulating film, a battery string, a third encapsulating film, a rear encapsulation plate, a fourth encapsulating film, and a rear film, which are stacked in sequence. The front film and the rear film each independently comprise the photovoltaic module encapsulation film as described in any one of claims 1 to 7.

10. The photovoltaic module according to claim 9, characterized in that, The thickness of the first encapsulating film and the fourth encapsulating film are each independently 0.3~0.7 mm; Preferably, the thickness of the second encapsulating film and the third encapsulating film are each independently 0.5~0.7 mm; Preferably, the thickness of each of the front packaging plates is independently 0.3~0.5 mm; Preferably, the first encapsulating film and the fourth encapsulating film each independently comprise any one or a combination of at least two of EVA film, POE film, or EPE co-extruded film; Preferably, the second encapsulating film and the third encapsulating film each independently comprise a POE film; Preferably, the front and rear packaging plates each independently comprise a PET film and / or a CPC film; Preferably, the battery string comprises XBC batteries.

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