CN220306259U - Battery piece and photovoltaic module - Google Patents
Battery piece and photovoltaic module Download PDFInfo
- Publication number
- CN220306259U CN220306259U CN202321742101.7U CN202321742101U CN220306259U CN 220306259 U CN220306259 U CN 220306259U CN 202321742101 U CN202321742101 U CN 202321742101U CN 220306259 U CN220306259 U CN 220306259U
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- protective layer
- adhesive
- battery
- battery piece
- receiving surface
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- 230000001070 adhesive effect Effects 0.000 claims description 80
- 239000000463 material Substances 0.000 claims description 63
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 23
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The utility model discloses a battery piece and a photovoltaic module, which belong to the technical field of solar cells, wherein the battery piece is a back contact solar battery piece; the light receiving surface of the battery piece is sequentially provided with an adhesive layer and a protective layer; the light transmittance of the protective layer is greater than the light transmittance threshold; the heat-resistant temperature of the protective layer is greater than or equal to a heat-resistant temperature threshold; the first surface of the protective layer is adhered to the first surface of the adhesive layer, the second surface of the adhesive layer is adhered to the light-receiving surface of the battery piece, and the protective layer meets the light transmittance requirement and does not need to be removed because the light-receiving surface of the battery piece is covered by the protective layer, so that the scratch of the light-receiving surface of the battery piece caused by stacking and transporting the battery piece can be prevented, and isolation paper does not need to be placed between two adjacent battery pieces, the failure rate of a production line is reduced, and the problem that the isolation paper is brought into the production line to cause failure in the prior art is solved.
Description
Technical Field
The utility model belongs to the technical field of solar cells, and particularly relates to a battery piece and a photovoltaic module.
Background
In the production process of photovoltaic modules, a battery sheet is required.
In the prior art, the cell is a back contact (Interdigitated Back Contact, IBC) solar cell.
The back contact solar cell is provided with a light receiving surface and a backlight surface, wherein the light receiving surface is the surface of the back contact solar cell for absorbing sunlight, namely the front surface of the back contact solar cell; the back surface is the back surface of the back contact solar cell, and the electrodes of the back contact solar cell are all arranged on the back surface.
However, in practical production, the inventors found that there are at least the following problems in the prior art: in order to prevent the light receiving surfaces of the battery pieces from being scratched due to stacking and transportation of the battery pieces in the production process of the photovoltaic module, the release paper is placed between two adjacent battery pieces, however, the release paper is difficult to take out, and the release paper is often brought into a production line to cause faults.
Disclosure of Invention
The utility model provides a battery piece and a photovoltaic module, which at least solve the problem that in the prior art, in order to prevent a light receiving surface of the battery piece from being scratched caused by stacking and transporting the battery pieces, isolation paper is placed between two adjacent battery pieces, so that the isolation paper is brought into a production line to cause faults.
In order to solve the technical problems, the utility model is realized as follows:
in a first aspect, the utility model provides a battery piece, wherein the battery piece is a back contact solar battery piece; the light receiving surface of the battery piece is sequentially provided with an adhesive layer and a protective layer; the light transmittance of the protective layer is larger than a light transmittance threshold; the heat-resistant temperature of the protective layer is greater than or equal to a heat-resistant temperature threshold;
the first surface of the protective layer is adhered with the first surface of the adhesive layer, the second surface of the adhesive layer
The surface is adhered to the light-receiving surface of the battery piece.
Optionally, at least one surface of the protective layer is a frosted surface.
Optionally, the first surface and the second surface of the protective layer are frosted surfaces.
Optionally, the roughness of the first side of the protective layer ranges from 0.4 mm to 1.0 mm; and/or the roughness of the second side of the protective layer is in the range of 0.4 mm to 1.0 mm.
Optionally, the protective layer covers the whole light receiving surface of the battery piece.
Optionally, the adhesive layer includes a plurality of adhesive portions, and the adhesive portions are uniformly or unevenly distributed in all or part of the area of the light receiving surface.
Optionally, the adhesive layer covers the whole light receiving surface of the battery piece.
Optionally, the thickness of the protective layer ranges from 30 micrometers to 60 micrometers.
Optionally, the thickness of the adhesive layer ranges from 5 micrometers to 10 micrometers.
Optionally, the light transmittance threshold is 95%, and/or the heat resistant temperature threshold is 160 ℃, further preferably 200 ℃.
Optionally, the material of the protective layer comprises one of polyethylene terephthalate material and photosensitive adhesive material, and when the material of the protective layer is photosensitive adhesive material, the protective layer is formed by the cured photosensitive adhesive material; the bonding layer is made of ethylene vinyl acetate copolymer material.
In a second aspect, the utility model provides a photovoltaic module comprising the cell according to the first aspect.
In the utility model, the cell is a back contact solar cell; the light receiving surface of the battery piece is sequentially provided with an adhesive layer and a protective layer; the light transmittance of the protective layer is greater than the light transmittance threshold; the heat-resistant temperature of the protective layer is greater than or equal to a heat-resistant temperature threshold; the first surface of the protective layer is adhered to the first surface of the adhesive layer, the second surface of the adhesive layer is adhered to the light-receiving surface of the battery piece, and the protective layer covers the light-receiving surface of the battery piece, so that the scratch of the light-receiving surface of the battery piece caused by stacking and transportation of the battery piece can be prevented, and isolation paper is not required to be placed between two adjacent battery pieces, thereby reducing the failure rate of a production line, and solving the problem that in the prior art, in order to prevent the scratch of the light-receiving surface of the battery piece caused by stacking and transportation of the battery piece, the isolation paper is placed between the two adjacent battery pieces, so that the isolation paper is brought into the production line to cause failure; in addition, in the lamination process of the photovoltaic module, the protective layer, the adhesive layer and the glass are fused to form a complete interface, so that the light transmittance requirement is met, the protective layer is not required to be removed, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic side view of a portion of a battery sheet according to an embodiment of the present utility model;
fig. 2 is a schematic view of a battery sheet according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a photovoltaic module according to an embodiment of the present utility model.
Reference numerals:
10-battery pieces; 11-a protective layer; 111-a first side of the protective layer; 112-a second side of the protective layer; 12-an adhesive layer; 121-a first side of the adhesive layer; 122-a second side of the adhesive layer; 13-a light receiving surface; 14-a backlight surface; 15-electrodes; 21-a glass layer; 22-a first glue layer; 23-a second glue layer; 24-backboard; 25-an outer frame; 26-junction box.
Detailed Description
Referring to fig. 1, a battery piece 10 according to an embodiment of the present utility model is a back contact solar battery piece 10; the light receiving surface 13 of the battery piece 10 is provided with an adhesive layer 12 and a protective layer 11 in sequence; the light transmittance of the protective layer 11 is greater than the light transmittance threshold; the heat-resistant temperature of the protective layer 11 is greater than or equal to a heat-resistant temperature threshold; the first surface 111 of the protective layer 11 is bonded to the first surface 121 of the adhesive layer 12, and the second surface 122 of the adhesive layer 12 is bonded to the light receiving surface 13 of the battery sheet 10.
It should be noted that, referring to fig. 3, the photovoltaic module (solar module) using the back contact solar cell sheet includes, in order from front to back, a glass layer 21, a first adhesive layer 22, a series group of the cell sheet 10, a second adhesive layer 23, a back plate 24, and an outer frame 25, wherein the glass layer 21 is generally tempered glass, and the tempered glass has good light transmittance and high hardness, can adapt to a larger day and night temperature difference and severe weather environment, and is used for covering the cell sheet 10 to protect the cell sheet 10; the materials of the first adhesive layer 22 and the second adhesive layer 23 are generally EVA (Ethylene Vinyl Acetate Copolymer ) materials, the first adhesive layer 22 is used for bonding the battery piece 10 and the glass together, and the second adhesive layer 23 is used for bonding the battery piece 10 and the back plate 24 together; the series group of the battery pieces 10 comprises a plurality of battery pieces 10, wherein the battery pieces 10 are back contact solar battery pieces, are core components of a photovoltaic module and are used for solar power generation; the back plate 24 is generally a TPT back plate 24, the TPT back plate 24 is the back plate 24 formed by three layers of films of PVF (polyvinyl-fluoride) -PET (polyethylene glycol terephthalate, polyester film)) -PVF, and the back plate 24 has the functions of sealing, insulating, waterproof and ageing-resistant, and can protect the battery cells 10, so that the service life of the photovoltaic module is prolonged; the outer frame 25 is generally an aluminum alloy outer frame 25, and the aluminum alloy outer frame 25 has good strength and corrosion resistance and can play a role in supporting and protecting the battery cells 10.
In addition, the photovoltaic module further comprises a junction box 26 arranged on the aluminum alloy outer frame 25, and the junction box 26 protects the power generation system of the whole battery piece 10 and plays a role in sealing and waterproofing the outgoing line of the photovoltaic module. In addition, when a short circuit occurs in the battery cell 10, the junction box 26 automatically opens the series group of the short-circuited battery cell 10.
The production process for the photovoltaic module using the back contact solar cell sheet comprises the following steps: (1) Battery testing, i.e., classifying the battery cells 10 by testing the magnitude of the output parameters (current and voltage) of the battery cells 10 to combine battery cells 10 having consistent or similar performance; (2) Transporting, namely, after stacking the battery pieces 10, transporting the battery pieces to a subsequent production line of the photovoltaic module; (3) Printing the back green paste and the gray paste, namely, performing the back green paste and the gray paste printing on the electrode 15 of the backlight surface 14 of the battery piece 10; (4) Back series welding, namely, a plurality of battery pieces 10 are welded together in series to form a series group of battery pieces 10; (5) Laminating, namely sequentially laying a glass layer 21, a first adhesive layer 22, a series group of battery pieces 10, a second adhesive layer 23 and a back plate 24; (6) Laminating, namely placing the laid glass layer 21, the first adhesive layer 22, the series group of the battery pieces 10, the second adhesive layer 23 and the back plate 24 into a laminating machine, pumping out air in the assembly through vacuumizing, heating to enable the first adhesive layer 22 and the second adhesive layer 23 to be melted, bonding the glass layer 21, the series group of the battery pieces 10 and the back plate 24 together to form an initial photovoltaic assembly, and finally cooling and taking out the initial photovoltaic assembly, wherein the protective layer 11 of the battery pieces 10, the first adhesive layer 22 and the glass layer 21 are fused into an interface, thereby meeting the light transmittance requirement, eliminating the protective layer and improving the production efficiency; (7) Testing the photovoltaic module, namely mainly testing the power of the photovoltaic module; (8) assembling, namely, mounting the outer frame 25, connecting the junction box 26, and the like.
From the aspect of the material types of the battery pieces, the battery piece 10 provided by the embodiment of the utility model is a monocrystalline silicon solar battery piece, and the photoelectric conversion efficiency of the monocrystalline silicon solar battery piece can reach 28.7%; in addition, the cell 10 provided by the embodiment of the utility model can also be a heterojunction solar cell, and the photoelectric conversion efficiency of the heterojunction solar cell can reach 29.4%.
Referring to fig. 2, the battery piece 10 provided in the embodiment of the present utility model further includes a backlight surface 14, an electrode 15 is disposed on the backlight surface 14, and the types of the electrode 15 include a positive electrode and a negative electrode.
In the embodiment of the utility model, as the light receiving surface 13 of the battery piece 10 is covered with the protective layer 11, the scratch of the light receiving surface 13 of the battery piece 10 caused by stacking and transporting the battery pieces 10 can be prevented, and no isolation paper is required to be placed between two adjacent battery pieces 10, so that the failure rate of a production line is reduced, and the problem that in the prior art, in order to prevent the scratch of the light receiving surface 13 of the battery piece 10 caused by stacking and transporting the battery pieces 10, isolation paper is placed between the two adjacent battery pieces 10, so that the isolation paper is brought into the production line to cause failure is solved; in addition, in the lamination process of the photovoltaic module, the protective layer, the adhesive layer and the glass are fused to form a complete interface, so that the light transmittance requirement is met, the protective layer is not required to be removed, and the production efficiency is improved.
Specifically, in some embodiments, the adhesive layer 12 is an adhesive, such as an adhesive of EVA material; the protective layer 11 is a film, and there is no bubble in the protective layer 11.
The adhesive of the EVA material is EVA composite adhesive, which is one of the glues, and the main components of the EVA composite adhesive are thermoplastic styrene-butadiene rubber, rosin modified resin, petroleum resin and solvent, so that the EVA composite adhesive has good bonding effect, long aging time, no need of water treatment, one-time gluing, more convenient use and higher production efficiency. The cured product bonded by the EVA composite adhesive has super flexibility, can bear severe beating and falling, is not easy to peel off, and has good buffering property; the EVA composite adhesive has small smell and meets the environmental protection standard and the health standard. In addition, the EVA composite adhesive has high strength, high transparency and high initial adhesion.
In the embodiment of the utility model, the bonding layer of the EVA composite adhesive can enable the bonding between the protective layer and the light receiving surface of the battery piece to be firmer.
The first surface 121 and the second surface of the adhesive layer 12 are both planar, and the second surface 122 of the adhesive layer 12 has the same shape as the first surface 121 of the adhesive layer 12; the first surface 111 and the second surface 112 of the protective layer 11 are both planar, and the shape of the first surface 111 of the protective layer 11 is the same as the shape of the second surface 112 of the protective layer 11.
Optionally, in some embodiments, at least one surface of the protective layer 11 is frosted.
In the embodiment of the utility model, at least one surface of the protective layer 11 is a frosted surface, and the interface formed by the contact of the frosted surface and other surfaces reduces the degree of specular reflection generated by light and improves the light transmittance.
Optionally, in some embodiments, the first surface 111 and the second surface of the protective layer 11 are frosted surfaces.
In the embodiment of the utility model, since the first surface 111 of the protective layer 11 is adhered to the first surface 121 of the adhesive layer 12, and the first surface 111 of the protective layer 11 is a frosted surface, the interface formed by the first surface 111 of the protective layer 11 and the first surface 121 of the adhesive layer 12 reduces the degree of specular reflection generated by light and improves the light transmittance; in the lamination process of the photovoltaic module production process, a first adhesive layer 22 of an adhesive of EVA material is provided on the protective layer 11 of the battery sheet 10 to bond the battery sheet 10 with the glass plate. Since the second surface 112 of the protective layer 11 contacts the first adhesive layer 22 and the second surface 112 of the protective layer 11 is a frosted surface, the interface formed by the contact between the second surface 112 of the protective layer 11 and the first adhesive layer 22 reduces the degree of specular reflection generated by light and improves the light transmittance.
The entire area of the first surface 111 of the protective layer 11 is a frosted surface; the entire area of the second face 112 of the protective layer 11 is frosted.
Optionally, in some embodiments, the roughness of the first face 111 of the protective layer 11 ranges from 0.4 mm to 1.0 mm; and/or the roughness of the second face 112 of the protective layer 11 is in the range of 0.4 mm to 1.0 mm.
In the embodiment of the utility model, the roughness of the first surface 111 of the protective layer 11 ranges from 0.4 mm to 1.0 mm, so that the interface formed by the first surface 111 of the protective layer 11 and the first surface 121 of the adhesive layer 12 can reduce the degree of specular reflection generated by light and improve the light transmittance; in the lamination process of the photovoltaic module production process, a first adhesive layer 22 of an adhesive of EVA material is provided on the protective layer 11 of the battery sheet 10 to bond the battery sheet 10 with the glass plate. In the lamination process of the photovoltaic module, the second surface 112 is filled up by the liquid EVA in contact with the second surface 112, so that the protective layer 11 forms a complete interface with the first adhesive layer 22 of EVA and the glass layer 21, and the contact surface with the first adhesive layer of EVA in the lamination process of the photovoltaic module can be increased due to the frosted surface of the second surface 112 of the protective layer 11, so that the protective layer and the glass are adhered more tightly.
Specifically, in some embodiments, the roughness of the first face 111 of the protective layer 11 may be 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, etc.; the roughness of the second face 112 of the protective layer 11 may be 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, etc.
Optionally, in some embodiments, the protective layer 11 covers the entire light-receiving surface 13 of the battery sheet 10.
In the embodiment of the utility model, since the protection layer 11 covers the whole light receiving surface 13 of the battery piece 10, the whole light receiving surface 13 of the battery piece 10 can be protected, and the possibility of scratching the light receiving surface 13 of the battery piece 10 caused by stacking and transporting the battery piece 10 is reduced.
The shape of the second surface 112 of the protective layer 11 is the same as the shape of the light receiving surface 13 of the battery sheet 10, so that the protective layer 11 covers the entire light receiving surface 13 of the battery sheet 10.
Optionally, in some embodiments, the adhesive layer 12 includes a plurality of adhesive portions, and the adhesive portions are uniformly or unevenly distributed in all or part of the area of the light receiving surface 13.
In the embodiment of the present utility model, since the adhesive layer 12 includes a plurality of adhesive portions, the adhesive portions are uniformly distributed in all or part of the area of the light receiving surface 13, so that balance of adhesive force between the protective layer 11 and the light receiving surface 13 can be ensured, and further, adhesion tightness between the protective layer 11 and the light receiving surface 13 is improved.
The first surface 121 of the adhesive layer 12 includes a plurality of first surfaces of adhesive portions; the second face 122 of the adhesive layer 12 includes a plurality of second faces of adhesive portions.
Specifically, in some embodiments, the shape of each bond may be the same or different, and the bond may be rectangular, circular, triangular, or other shape; the number of the bonding portions may be 1, 2, 3, 4, or the like.
For example, in the case where the light receiving surface 13 of the battery sheet 10 is rectangular, the adhesive layer 12 may include 1 rectangular adhesive portion, the adhesive portion is located in a central region of the light receiving surface 13, that is, a geometric center of a second surface of the adhesive portion coincides with a geometric center of the light receiving surface 13, and each side of the second surface of the adhesive portion is parallel to a corresponding side of the light receiving surface 13; the adhesive layer 12 may include 2 identical adhesive parts having a rectangular shape, and the 2 adhesive parts are symmetrically distributed with respect to the center line of the light receiving surface 13; the adhesive layer 12 may include 3 identical adhesive parts having a rectangular shape, wherein 2 adhesive parts are symmetrically distributed with respect to the center line of the light receiving surface 13, the geometric center of the second surface of the other 1 adhesive part coincides with the geometric center of the light receiving surface 13, and one side of the second surface of the other 1 adhesive part is parallel to the center line of the light receiving surface 13; the adhesive layer 12 may include 4 identical adhesive portions having a rectangular shape, and the 4 adhesive portions are located at four corner regions of the light receiving surface 13, respectively.
In other embodiments, the adhesive layer 12 includes n×m adhesive portions, where N is the number of adhesive portions in a first direction of the array and M is the number of adhesive portions in a second direction of the array, and the angle between the first direction and the second direction is 90 degrees, and the adhesive portions are uniformly distributed on the light receiving surface 13 of the battery piece 10 in an array. The shape of each bond may be the same, and the bond may be rectangular, circular, triangular, or other shape.
For example, in the case where the light receiving surface 13 of the battery sheet 10 is rectangular, the adhesive layer 12 includes 20×30 circular adhesive parts, that is, 20×30 circular adhesive parts are arranged in a uniform array on the light receiving surface 13, 20 adhesive parts are arranged in each row of the array in the direction along the first side of the light receiving surface 13, 30 adhesive parts are arranged in each column of the array in the direction along the second side of the light receiving surface 13, and the angle between the first direction and the second direction is 90 degrees.
When the second surface 122 of the adhesive layer 12 (i.e., the plane formed by the second surfaces of all the adhesive portions) has the same shape as the light-receiving surface 13 of the battery cell 10, the adhesive portions are uniformly distributed over the entire area of the light-receiving surface 13; when the area of the second surface 122 of the adhesive layer 12 (i.e., the plane formed by the second surfaces of all the adhesive portions) is smaller than the area of the light-receiving surface 13 of the battery sheet 10, the adhesive portions are uniformly distributed in a partial region of the light-receiving surface 13.
Optionally, in some embodiments, the adhesive layer 12 covers the entire light-receiving surface 13 of the battery sheet 10.
When the adhesive layer 12 covers the entire light receiving surface 13 of the battery sheet 10, the shape of the first surface 111 of the protective layer 11 is the same as the shape of the first surface 121 of the adhesive layer 12.
In the embodiment of the utility model, since the bonding layer 12 covers the whole light receiving surface 13 of the battery piece 10, the bonding between the whole first surface of the protective layer 11 and the whole light receiving surface 13 of the battery piece 10 can be ensured, the bonding firmness between the first surface 111 of the protective layer 11 and the light receiving surface 13 of the battery piece 10 is improved, and meanwhile, the appearance and the texture of the light receiving surface 13 of the battery piece 10 are uniform, and the aesthetic property is improved.
Optionally, in some embodiments, the thickness of the protective layer 11 ranges from 30 micrometers to 60 micrometers.
In the embodiment of the utility model, the thickness of the protective layer 11 ranges from 30 micrometers to 60 micrometers, so that the protective layer 11 is thinned, and the requirement of thinning the battery piece 10 is met.
Specifically, in some embodiments, the thickness of the protective layer 11 may be 30 microns, 35 microns, 40 microns, 45 microns, 50 microns, 55 microns, 60 microns, etc.
Alternatively, in some embodiments, the adhesive layer 12 has a thickness in the range of 5 microns to 10 microns.
In the embodiment of the utility model, the thickness of the adhesive layer 12 ranges from 5 micrometers to 10 micrometers, so that the adhesive layer 12 is thinned, and the requirement of thinning the battery piece 10 is met.
Specifically, in some embodiments, the thickness of the adhesive layer 12 may be 5 microns, 6 microns, 7 microns, 8 microns, 9 microns, 10 microns.
Optionally, in some embodiments, the light transmittance threshold is 95%.
In the embodiment of the utility model, the light transmittance of the protective layer 11 is greater than the light transmittance threshold, and the light transmittance threshold is 95%, that is, the light transmittance of the protective layer 11 is greater than 95%, so that the protective layer 11 has good light transmittance, and the requirement of the battery piece 10 on good light transmittance is met.
Specifically, in some embodiments, the light transmittance of the protective layer 11 may be 96%, 97%, 98%, 99%, or the like.
Optionally, in some embodiments, the material of the protective layer 11 includes one of polyethylene terephthalate material and photosensitive adhesive material; and/or the bonding layer is an ethylene vinyl acetate copolymer material.
Optionally, in some embodiments, the heat resistant temperature threshold is 160 ℃.
Since the protective layer formed of a material having a low melting point (for example, EVA has a melting point of 60-110 ℃) is easily melted during the production process of the photovoltaic module, the battery sheet is stuck to the production equipment, and the normal production of the photovoltaic module is affected. In the embodiment of the utility model, the heat-resistant temperature of the protective layer 11 is greater than the heat-resistant temperature threshold, namely, the heat-resistant temperature of the protective layer 11 (namely, the melting point of the protective layer 11) is greater than the heat-resistant temperature threshold (160 ℃), so that the protective layer 11 has good heat stability, does not melt in the production process of the photovoltaic module, and ensures the normal production of the photovoltaic module.
Specifically, in some embodiments, the heat resistant temperature of the protective layer 11 may be 250 ℃ (e.g., the melting point of the protective layer of PET material is in the range of 250 ℃ to 255 ℃) or the like.
Optionally, in some embodiments, the material of the protective layer 11 includes one of polyethylene terephthalate material and photosensitive adhesive material, where the material of the protective layer is photosensitive adhesive material, the protective layer is a protective layer formed by cured photosensitive adhesive material; and/or the bonding layer is an ethylene vinyl acetate copolymer material.
In the embodiment of the present utility model, the material of the protective layer 11 includes one of a polyethylene terephthalate (polyethylene glycol terephthalate, PET) material and a photosensitive adhesive (UV adhesive, UV, ultraviolet) material, the heat-resistant temperature of the polyethylene terephthalate material is in the range of 250 ℃ to 255 ℃ (e.g. 255 ℃), the heat-resistant temperature of the photosensitive adhesive material is 160 ℃, and the heat-resistant temperatures of the two materials are both greater than or equal to 160 ℃, so that the problem that the protective layer is easily melted in the production process of the photovoltaic module, resulting in that the battery sheet is stuck on the production equipment, and the normal production of the photovoltaic module is affected can be avoided; the light transmittance of the two materials is more than 95 percent, the reliability is more than 25 years, and the performance requirements of the light transmittance and the reliability of the battery piece 10 can be met; in addition, the protective layer 11 may be made of other materials with light transmittance of more than 95%, heat-resistant temperature of more than or equal to 160 ℃ and reliability of more than 25 years; the bonding layer is made of ethylene vinyl acetate copolymer material, so that the bonding between the protective layer and the light receiving surface of the battery piece is firmer.
The polyethylene terephthalate material is a milky white or pale yellow polymer, and has a smooth and glossy surface. The polyethylene terephthalate material has excellent physical and mechanical properties in a wider temperature range, excellent electrical insulation, better electrical property even under high temperature and high frequency, good creep resistance, fatigue resistance, friction resistance, dimensional stability, organic solvent resistance and weather resistance, the processability and physical properties of the polyethylene terephthalate material can be improved by reinforcing, filling, blending and other methods, the glass fiber reinforcing effect is obvious, the rigidity, heat resistance, chemical resistance, electrical property and weather resistance of the polyethylene terephthalate material can be improved, and the flame retardance and self-extinguishing property of the polyethylene terephthalate material can be improved by adding the flame retardant and the flame retardant dripping agent.
Photosensitive adhesives, also known as UV adhesives, ultraviolet adhesives, shadowless adhesives, are an adhesive material that must be cured by ultraviolet radiation. The photosensitive adhesive curing principle is that a photoinitiator in the UV curing material generates active free radicals or cations after absorbing ultraviolet light under the irradiation of ultraviolet light to initiate the chemical reaction of monomer polymerization and crosslinking, so that the adhesive is converted from a liquid state to a solid state within a few seconds. The photosensitive adhesive has high environmental protection, no pollution to the environment and low flammability; the curing speed of the photosensitive adhesive is very high, and the curing can be completed in several seconds to tens of seconds by using different power UV curing equipment, so that the photosensitive adhesive is very suitable for an automatic production line, and the production efficiency is improved; the photosensitive adhesive has high bonding strength, and can be used for temperature, solvent and moisture sensitive materials.
In the embodiment of the utility model, the bonding strength of the photosensitive adhesive is high, so that the bonding between the protective layer of the photosensitive adhesive material and the bonding layer is firmer, the bonding between the protective layer of the photosensitive adhesive material and the light-receiving surface of the battery piece is firmer, and the protective layer of the photosensitive adhesive material is more difficult to fall off from the light-receiving surface of the battery piece.
Under the irradiation of ultraviolet rays (for example, the irradiation time is 2 seconds), the photosensitive adhesive is solidified, and the solidified photosensitive adhesive forms a protective layer of photosensitive adhesive material.
In actual production, an adhesive of an EVA material is sprayed on a thin film (protective layer 11) of a polyethylene terephthalate material or a photosensitive adhesive material under high temperature and high pressure, heated under a preset temperature (a preset temperature range of 90 ℃ to 120 ℃) based on a heating time (a heating time range of 1 to 3 seconds), an adhesive layer 12 is formed, and then the protective layer 11 with the adhesive layer 12 is placed on a light receiving surface 13 of a back contact solar cell and pressed based on a pressing pressure (a pressing pressure range of 30 newtons to 50 newtons), so that the protective layer 11 with the adhesive layer 12 is adhered on the light receiving surface 13 of the back contact solar cell through the adhesive layer 12, to obtain the cell 10 provided by the embodiment of the utility model.
Preferably, in some embodiments, the heat resistant temperature threshold is 200 ℃.
It should be noted that, under the condition that the heat-resistant temperature threshold is 200 ∈r, the material of the protective layer 11 may be a polyethylene terephthalate material, the heat-resistant temperature of the polyethylene terephthalate material is in the range of 250 ℃ to 255 ℃ (for example, 255 ℃), and the heat-resistant temperature of the polyethylene terephthalate material is greater than or equal to the heat-resistant temperature threshold (200 ℃), so that the problem that the protective layer is easily melted in the production process of the photovoltaic module, resulting in that the battery piece is stuck on the production equipment, and the normal production of the photovoltaic module is affected can be avoided; the protective layer 11 may be made of other materials having a heat resistant temperature equal to or higher than the heat resistant temperature threshold (200 ℃).
Referring to fig. 3, a photovoltaic module according to an embodiment of the present utility model includes the foregoing battery sheet 10.
In this embodiment of the application, the photovoltaic module includes, in order from front to back, the glass layer 21, the first adhesive layer 22, the series group of the battery pieces 10, the second adhesive layer 23, the back plate 24, and the outer frame 25, and since the battery pieces form a complete interface with the first adhesive layer and the glass layer, the requirement of light transmittance is satisfied, the protective layer is not required to be removed, and the production efficiency is improved. The battery piece 10 provided by the utility model is a back contact solar battery piece; the light receiving surface 13 of the battery piece 10 is provided with an adhesive layer 12 and a protective layer 11 in sequence; the light transmittance of the protective layer 11 is greater than the light transmittance threshold; the first surface 111 of the protective layer 11 is adhered to the first surface 121 of the adhesive layer 12, the second surface 122 of the adhesive layer 12 is adhered to the light receiving surface 13 of the battery piece 10, and as the light receiving surface 13 of the battery piece 10 is covered with the protective layer 11, the scratch of the light receiving surface 13 of the battery piece 10 caused by stacking and transportation of the battery pieces 10 can be prevented, and no release paper is required to be placed between two adjacent battery pieces 10, so that the failure rate of a production line is reduced, and the problem that in the prior art, in order to prevent the light receiving surface 13 of the battery piece 10 from being scratched caused by stacking and transportation of the battery pieces 10, release paper is placed between the two adjacent battery pieces 10, and the release paper is brought into the production line to cause failure is solved.
In summary, the battery sheet 10 provided by the present utility model is a back contact solar battery sheet; the light receiving surface 13 of the battery piece 10 is provided with an adhesive layer 12 and a protective layer 11 in sequence; the light transmittance of the protective layer 11 is greater than the light transmittance threshold; the first surface 111 of the protective layer 11 is adhered to the first surface 121 of the adhesive layer 12, the second surface 122 of the adhesive layer 12 is adhered to the light-receiving surface 13 of the battery piece 10, and as the light-receiving surface 13 of the battery piece 10 is covered with the protective layer 11, the scratch of the light-receiving surface 13 of the battery piece 10 caused by stacking and transportation of the battery pieces 10 can be prevented, and no release paper is required to be placed between two adjacent battery pieces 10, so that the failure rate of a production line is reduced, and the problem that in the prior art, in order to prevent the light-receiving surface 13 of the battery piece 10 from being scratched caused by stacking and transportation of the battery pieces 10, release paper is placed between the two adjacent battery pieces 10, and the release paper is brought into the production line to cause failure is solved; in addition, in the lamination process of the photovoltaic module, the protective layer, the adhesive layer and the glass are fused to form a complete interface, so that the light transmittance requirement is met, the protective layer is not required to be removed, and the production efficiency is improved.
Finally, it is further noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (12)
1. The battery piece is a back contact solar battery piece and is characterized in that an adhesive layer and a protective layer are sequentially arranged on a light receiving surface of the battery piece; the light transmittance of the protective layer is larger than a light transmittance threshold; the heat-resistant temperature of the protective layer is greater than or equal to a heat-resistant temperature threshold;
the first surface of the protective layer is adhered to the first surface of the adhesive layer, and the second surface of the adhesive layer is adhered to the light-receiving surface of the battery piece.
2. The battery of claim 1, wherein at least one side of the protective layer is frosted.
3. The battery cell of claim 2, wherein the first and second sides of the protective layer are frosted.
4. The battery sheet according to claim 3, wherein,
the roughness of the first side of the protective layer ranges from 0.4 mm to 1.0 mm; and/or:
the roughness of the second face of the protective layer ranges from 0.4 mm to 1.0 mm.
5. The battery cell of claim 1, wherein the protective layer covers the entire light-receiving surface of the battery cell.
6. The battery sheet according to claim 1, wherein the adhesive layer includes a plurality of adhesive portions, and the adhesive portions are uniformly or unevenly distributed over all or part of the light receiving surface.
7. The battery cell of claim 1, wherein the adhesive layer covers the entire light-receiving surface of the battery cell.
8. The battery cell of claim 1, wherein the protective layer has a thickness in the range of 30 microns to 60 microns.
9. The battery cell of claim 1, wherein the adhesive layer has a thickness in the range of 5 microns to 10 microns.
10. The battery cell of claim 1, wherein the light transmittance threshold is 95%; and/or the heat resistant temperature threshold is 160 ℃, or the heat resistant temperature threshold is 200 ℃.
11. The battery piece according to claim 1, wherein the material of the protective layer comprises one of polyethylene terephthalate material and photosensitive adhesive material, and when the material of the protective layer is photosensitive adhesive material, the protective layer is formed by the cured photosensitive adhesive material; and/or
The bonding layer is made of ethylene vinyl acetate copolymer material.
12. A photovoltaic module comprising the battery sheet of any one of claims 1 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321742101.7U CN220306259U (en) | 2023-07-04 | 2023-07-04 | Battery piece and photovoltaic module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321742101.7U CN220306259U (en) | 2023-07-04 | 2023-07-04 | Battery piece and photovoltaic module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220306259U true CN220306259U (en) | 2024-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321742101.7U Active CN220306259U (en) | 2023-07-04 | 2023-07-04 | Battery piece and photovoltaic module |
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| Country | Link |
|---|---|
| CN (1) | CN220306259U (en) |
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- 2023-07-04 CN CN202321742101.7U patent/CN220306259U/en active Active
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