CN114597277A - Photovoltaic module and preparation method thereof - Google Patents
Photovoltaic module and preparation method thereof Download PDFInfo
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- CN114597277A CN114597277A CN202210111527.6A CN202210111527A CN114597277A CN 114597277 A CN114597277 A CN 114597277A CN 202210111527 A CN202210111527 A CN 202210111527A CN 114597277 A CN114597277 A CN 114597277A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
- H01L31/0512—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module made of a particular material or composition of materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1876—Particular processes or apparatus for batch treatment of the devices
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- 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
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Abstract
The embodiment of the application discloses a photovoltaic module and a preparation method of the photovoltaic module, wherein the photovoltaic module comprises: at least two battery pieces; a conductor; the conductor is connected to the battery pieces through the fixing layer, so that two adjacent battery pieces are connected in series, and the melting point of one side, facing the battery pieces, of the fixing layer is 60-120 ℃. In the preparation process of the photovoltaic module, the conductor piece can be bonded on the cell piece in a mode of melting the fixing layer, the welding process in the traditional technology is replaced, series connection of the cell pieces can be realized under the temperature condition of 60-120 ℃, the temperature of circuit interconnection of the cell pieces is greatly reduced, the photovoltaic module can be protected, the damage of the cell pieces of the photovoltaic module due to overhigh welding temperature is avoided, and the service life and the performance of the photovoltaic module are improved.
Description
Technical Field
The embodiment of the application relates to the technical field of photovoltaics, in particular to a photovoltaic module and a preparation method of the photovoltaic module.
Background
Photovoltaic cell needs to establish ties a plurality of battery pieces and forms the battery cluster among the prior art to play the effect of converging, mostly with conductor direct welding in the prior art in the battery piece, welding temperature need be above 150 ℃, can probably harm the performance that the battery piece influences the battery piece, especially when using the lamp that welds of infrared heating, the lamp that welds can heat up fast, can reach or exceed the rete damage temperature of heterojunction battery very easily in the twinkling of an eye.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the invention provides a photovoltaic module.
In a second aspect, the invention provides a method of making a photovoltaic module.
In view of this, according to a first aspect of the embodiments of the present application, there is provided a photovoltaic module, including:
at least two battery pieces;
a conductor;
the conductor is connected to the battery pieces through the fixing layer, so that two adjacent battery pieces are connected in series, and the melting point of one side, facing the battery pieces, of the fixing layer is 60-120 ℃.
In one possible embodiment, the material for preparing the fixing layer includes:
the base material comprises at least one of polyester resin, polyethylene octene co-elastomer, ethylene-vinyl acetate and polyolefin thermoplastic elastomer.
In a possible embodiment, the material for preparing the fixing layer further comprises:
a crosslinking agent for performing a crosslinking reaction with the substrate after the substrate is melted.
In a possible embodiment, each of the battery pieces includes a first face and a second face which are oppositely arranged, and the conductor is connected to the first face of one of the two adjacent battery pieces and the second face of the other of the two adjacent battery pieces through the fixing layer.
In one possible embodiment, the fixing layer includes:
the first fixing layer is used for being connected to the first surfaces of at least two battery pieces;
the second fixing layer is used for being connected to the second surfaces of the at least two battery pieces;
wherein the first and second fixing layers have a light transmittance of 70% or more.
In one possible embodiment, the conductor member includes:
a weld band body;
and the hot melting layer is coated on the welding strip body and is made of a material with the melting point of 50-500 ℃.
In one possible embodiment, the photovoltaic module further comprises:
and at least two bus bars, which are connected with the conductor pieces at the end part of the battery string in series to form the battery string, are arranged at the end part of the battery string and are connected with the conductor pieces on the battery pieces at the end part of the battery string.
In one possible embodiment, the photovoltaic module further comprises:
and the adhesive layer is arranged between the conductor and the fixing layer and/or between the adhesive layer and the battery piece.
In one possible embodiment, the fixing layer includes:
the adhesive layer has a melting point of 60-120 ℃;
the isolating layer is connected to the bonding layer, and the melting point of the isolating layer is greater than or equal to 150 ℃.
In one possible embodiment, the fixing layer further comprises:
a plurality of organic layers disposed between the adhesive layer and the barrier layer.
According to a second aspect of the embodiments of the present application, there is provided a method for manufacturing a photovoltaic module, the method for manufacturing a photovoltaic module according to any one of the above-mentioned technical solutions, the method including:
providing a battery piece, and preheating the battery piece for the first time;
connecting the conductor to two adjacent battery pieces through the fixing layer to obtain a battery string;
and carrying out secondary preheating on the battery string in a pressing state.
In one possible embodiment of the method according to the invention,
the temperature of the primary preheating is 80-120 ℃;
the temperature of the secondary preheating is 80 ℃ to 160 ℃.
Compared with the prior art, the invention at least comprises the following beneficial effects: the photovoltaic module that this application embodiment provided has included two at least battery pieces, conductor and fixed layer, the conductor passes through the fixed layer and connects in two adjacent battery pieces, in order to realize the series connection of two adjacent battery pieces, photovoltaic module's confluence has been realized, the fixed layer is 60 ℃ to 120 towards the melting point of one side of battery piece, make can bond the conductor on the battery piece through the mode of melting the fixed layer in photovoltaic module's preparation process, replace the welding process among the conventional art, can realize the series connection of battery piece under the temperature condition of 60 ℃ to 120 ℃, greatly reduced the interconnected temperature of battery piece circuit, can play protection photovoltaic module, avoid photovoltaic module's battery piece to damage because of welding temperature is too high, photovoltaic module's life and performance have been improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic block diagram of a photovoltaic module according to one embodiment provided herein;
FIG. 2 is a schematic block diagram of a conductor of a photovoltaic module according to one embodiment provided herein;
FIG. 3 is a schematic block diagram of a photovoltaic module anchoring layer according to one embodiment provided herein;
FIG. 4 is a schematic block diagram of a photovoltaic module anchor layer according to another embodiment provided herein;
fig. 5 is a schematic step flow diagram of a method of making a photovoltaic module according to another embodiment provided herein.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 and fig. 4 is:
100 battery pieces, 200 conductors, 300 fixed layers;
201 solder strip body, 202 hot melt layer, 211 metal column, 212 metal layer, 301 first fixed layer, 302 second fixed layer, 303 adhesion layer, 304 isolation layer, 305 organic layer.
Detailed Description
In order to better understand the technical solutions described above, the technical solutions of the embodiments of the present application are described in detail below with reference to the drawings and the specific embodiments, and it should be understood that the specific features of the embodiments and the embodiments of the present application are detailed descriptions of the technical solutions of the embodiments of the present application, and are not limitations of the technical solutions of the present application, and the technical features of the embodiments and the embodiments of the present application may be combined with each other without conflict.
As shown in fig. 1, according to a first aspect of embodiments of the present application, there is provided a photovoltaic module, including: at least two battery pieces 100; a conductor 200; the fixing layer 300, the conductor 200 is connected to the battery pieces 100 through the fixing layer 300, so that two adjacent battery pieces 100 are connected in series, and the melting point of the fixing layer 300 facing to one side of the battery pieces 100 is 60 ℃ to 120 ℃.
The photovoltaic module provided by the embodiment of the application comprises at least two battery pieces 100, a conductor 200 and a fixing layer 300, wherein the conductor 200 is connected to the two adjacent battery pieces 100 through the fixing layer 300 to realize the series connection of the two adjacent battery pieces 100 and realize the confluence of the photovoltaic module, and the melting point of one side, facing the battery pieces 100, of the fixing layer 300 is 60-120 ℃, so that the conductor 200 can be adhered to the battery pieces 100 in the preparation process of the photovoltaic module in a mode of melting the fixing layer 300, the welding process in the traditional technology is replaced, the series connection of the battery pieces 100 can be realized under the temperature condition of 60-120 ℃, the temperature of circuit interconnection of the battery pieces 100 is greatly reduced, the photovoltaic module can be protected, the damage of the battery pieces 100 of the photovoltaic module due to overhigh welding temperature is avoided, and the service life and the performance of the photovoltaic module are improved.
It can be understood that the fixed layer 300 can be a multilayer structure, the fixed layer 300 can include a connection layer and a substrate layer, the melting point of the connection layer is 60 ℃ to 120 ℃, the connection layer is connected to the substrate layer, the connection layer is used for melting to connect the conductor 200 to the battery piece 100, and the mechanical strength of the fixed layer 300 can be improved through the setting of the substrate layer, the wear-resisting property of the fixed layer 300 is ensured, and when the conductor 200 is attached to the battery piece 100 at the fixed layer 300, the fixed layer 300 can take into account the effect of auxiliary protection.
It can be understood that the fixing layer 300 may also be of a single-layer structure, so as to facilitate the production and processing of the fixing layer 300, when the conductor 200 is attached to the battery piece 100 by the fixing layer 300 of the single-layer structure, the fixing layer 300 of the single-layer structure may also play a certain auxiliary protection role, so as to avoid the contact between the conductor 200 and the outside air, reduce the probability that the conductor 200 is worn, and improve the service life.
It is understood that, in order to secure the power generation performance of the photovoltaic module, the light transmittance of the fixing layer 300 needs to be greater than or equal to 70%.
It is understood that the side of the fixing layer 300 facing the battery cell 100 has a melting point of 60 to 120 ℃. The fixing layer 300 is arranged to fix the battery piece 100 and isolate the battery piece 100, so that the wear of the battery piece 100 can be reduced.
According to the photovoltaic module provided by the embodiment of the application, through the arrangement of the fixing layer 300, on one hand, the connection between the conductor 200 and the cell 100 is more reliable, the conductor 200 can be prevented from being separated from the cell 100, a gap between the conductor 200 and the cell 100 can be prevented, and the power generation efficiency of the photovoltaic module is ensured; on the other hand, the traditional welding process is replaced, a welding pad is not required to be arranged, the cost is saved, the process is simplified, meanwhile, the shading area caused by the fixation of the conductor 200 can be reduced, the optical loss of the photovoltaic module is favorably reduced, and the power generation efficiency of the photovoltaic module can be improved; on the other hand, the conductor 200 is fixed on the cell 100 by melting the fixing band, and the conductor 200 does not need to be fixed by welding equipment, so that the wire diameter of the conductor 200 is further reduced, the shading area of the conductor 200 can be further reduced, and the power generation efficiency of the photovoltaic module is improved.
In some examples, the material from which the fixing layer 300 is made includes: the base material comprises at least one of polyester resin, polyethylene octene co-elastomer, ethylene-vinyl acetate and polyolefin thermoplastic elastomer.
The base material for preparing the fixing layer 300 comprises at least one of nylon resin, polyethylene octene co-elastomer, ethylene-vinyl acetate and polyolefin thermoplastic elastomer, so that the fixing layer 300 has excellent hydrophobicity and light transmittance, the shading performance of the photovoltaic module can be prevented from being increased due to the introduction of the fixing layer 300, the optical loss of the photovoltaic module can be further reduced, and the power generation efficiency of the photovoltaic module can be guaranteed.
In some examples, the material from which the fixed layer 300 is made further includes: and the crosslinking agent is used for carrying out crosslinking reaction with the base material after the base material is melted.
The material for preparing the fixing layer 300 further comprises a cross-linking agent, and through the arrangement of the cross-linking agent, after the fixing layer 300 reaches the melting point, the base material of the fixing layer 300 is melted, and the melted base material can be cross-linked with the cross-linking agent, so that the chemical property of the solidified layer after re-solidification can be more stable, the solidified layer can not be changed in chemical property under the condition of 150 ℃ to 300 ℃, particularly, the melting point of the solidified layer after re-solidification can be increased, the melting point of the solidified layer after re-solidification can reach 150 ℃ to 300 ℃, and the fixing layer 300 can be prevented from being separated from the photovoltaic module in the using process.
As shown in fig. 1, in some examples, each of the battery sheets 100 includes first and second faces disposed opposite to each other, and the conductor member 200 is connected to the first face of one of the adjacent two battery sheets 100 and the second face of the other of the adjacent two battery sheets 100 through the fixing layer 300.
Each battery piece 100 comprises a first surface and a second surface, one of the first surface and the second surface is a positive electrode, the other one is a negative electrode, the conductor member 200 is connected to the first surface of one of the two adjacent battery pieces 100 through the fixing layer 300, and the two adjacent battery pieces 100 can be connected in series through the fixing layer 300 being connected to the second surface of the other one of the two adjacent battery pieces 100, so that the battery string is formed conveniently.
In some examples, the battery sheet 100 includes: a battery body; the grid lines are arranged on the battery body at intervals in a first direction; wherein, a plurality of conductor parts 200 are arranged on each cell 100, the plurality of conductor parts 200 are connected to the grid lines and/or the cell body, and the plurality of conductor parts 200 are arranged at intervals in a second direction, and the second direction intersects with the first direction.
Each cell 100 comprises a cell body and a plurality of grid lines, the cell body can convert solar energy into electric energy, the current generated on the cell body can be collected through the arrangement of the grid lines, and the current on the cell body can be better collected through the arrangement of the grid lines.
The first direction that sets up of grid line sets up the crossing setting of direction with the second of conductor 200, and the grid line uses with the combination of conductor 200, can collect the electric current that produces on the battery body longitude and latitude direction for the collection of electric current is more swift and comprehensive, can improve photovoltaic module's generating efficiency.
In some examples, the second direction may be perpendicular to the first direction, which may better collect the current generated on the battery body.
In some examples, the line diameter of the grid line can be 10 μm to 100 μm, and the arrangement of the line diameter of the grid line is thinner, so that the shading area of the grid line can be reduced, the optical loss of the photovoltaic module can be reduced, and the power generation efficiency of the photovoltaic module can be improved.
In some examples, the number of the conductors 200 provided per cell 100 is 9 to 30.
The number of the conductors 200 arranged on each cell piece 100 is 9 to 30, so that a plurality of conductors 200 can be arranged on each cell piece 100 along the second direction, current can be better collected through the arrangement of the plurality of conductors 200, and the power generation efficiency of the photovoltaic module can be further improved.
In some examples, the photovoltaic module further comprises: and a bus bar, at least two of the battery pieces 100 being connected in series by the conductor members 200 to form a battery string, the bus bar being provided at an end of the battery string, the bus bar being connected to the conductor members 200 on the battery pieces 100 at the end of the battery string.
At least two battery pieces 100 are connected in series through the conductor 200 to form a battery string, and bus bars arranged at the ends of the battery string are the positive electrode and the negative electrode of the battery string, so that current generated by the battery string can be transmitted.
As shown in fig. 1, in some examples, the fixed layer 300 includes: the first fixing layer 301, the first fixing layer 301 is used for connecting to the first surfaces of at least two battery pieces 100; a second fixing layer 302, wherein the second fixing layer 302 is used for being connected to the second surfaces of the at least two battery pieces 100; wherein the light transmittance of the first and second pinned layers 301 and 302 is greater than or equal to 70%.
The fixing layer 300 comprises a first fixing layer 301 and a second fixing layer 302, the first fixing layer 301 can be attached to the first surfaces of the plurality of battery pieces 100, and the second fixing layer 302 can be attached to the second surfaces of the plurality of battery pieces 100, so that the fixing layer 300 can be mounted conveniently, and the conductor 200 can be connected with the battery pieces 100 conveniently.
The light transmittance of the first fixing layer 301 and the second fixing layer 302 is greater than or equal to 70%, and the power generation performance of the photovoltaic module can be guaranteed.
As shown in fig. 2, in some examples, conductor 200 includes: a solder strip body 201; the hot melting layer 202 is coated on the welding strip body 201, and the hot melting layer 202 is made of a material with the melting point of 50-500 ℃.
The solder strip that this application embodiment provided has included solder strip body 201 and the hot melt layer 202 of cladding on solder strip body 201, wherein the melting point of hot melt layer 202 is 50 ℃ to 500 ℃, in the solder strip use that this application embodiment provided, can set up the solder strip on the battery piece that is used for preparing photovoltaic module, then heat the solder strip, the temperature that makes the solder strip is greater than the melting point temperature of hot melt layer 202, the hot melt layer 202 on the solder strip can melt, then reduce temperature, make the hot melt layer 202 after the melting solidify once more, the solder strip can laminate on the battery piece, it can realize the series connection of a plurality of battery pieces to repeat two adjacent battery pieces of above-mentioned step connection.
According to the welding strip provided by the embodiment of the application, in the use process of the welding strip, the hot melt layer 202 is melted, and then the welding strip body 201 is connected to the cell piece through re-solidification of the hot melt layer 202, so that on one hand, the connection between the welding strip and the cell piece is more reliable, the welding strip can be prevented from being separated from the cell piece, a gap between the welding strip and the cell piece can be prevented, and the power generation efficiency of a photovoltaic module is ensured; on the other hand, the traditional welding process is replaced, a welding pad is not required to be arranged, the cost is saved, the process is simplified, meanwhile, the shading area caused by fixing of the welding strip can be reduced, the optical loss of the photovoltaic module is favorably reduced, and the power generation efficiency of the photovoltaic module can be improved; on the other hand, the solder strip is fixed on the cell piece in a mode of melting the hot melt layer 202, the solder strip does not need to be fixed through welding equipment, the wire diameter of the solder strip is favorably further reduced, the shading area of the solder strip can be further reduced, and the power generation efficiency of the photovoltaic module is improved.
More preferably, the melting point of the material used to make the hot melt layer 202 may be between 200 ℃ and 500 ℃.
It can be understood that, the solder strip provided by the embodiment of the application does not need to form a bonding pad on the battery piece in the process of connecting the solder strip to the battery piece, and the temperature of the solder strip in the installation process is between 50 ℃ and 500 ℃, so that compared with the traditional technology, the solder strip can avoid the damage of the battery piece caused by high temperature or the bonding pad, can ensure the integrity of the battery piece, and is favorable for further improving the power generation efficiency of the photovoltaic module.
It can be understood that, in order to ensure that the solder ribbon can function as a series cell, the solder ribbon body 201 needs to be made of a conductor material, and the lower the resistivity of the solder ribbon body 201, the higher the power generation efficiency of the photovoltaic module.
It can be understood that, the welding strip that this application embodiment provided, hot melt layer 202 cladding have set up hot melt layer 202 for the week side that welds and take body 201 promptly on welding the body 201, in welding the area use, weld the area and can fix on the battery piece through arbitrary angle for the installation of welding the area makes the series connection of a plurality of battery pieces more convenient, has reduced the technology degree of difficulty.
It is understood that the specific shape of the thermal melting layer 202 is not limited in this application, for example, the cross section of the thermal melting layer 202 may be circular, directional, or any irregular geometric figure.
In some examples, the hot melt layer 202 is made of an organic material having a melting point of 50 ℃ to 500 ℃.
The material for preparing the hot melt layer 202 can be an organic material, and through the selection of the organic material, in the preparation process of the solder strip, the solder strip body 201 only needs to penetrate through the organic material in the molten state, a layer of the organic material in the molten state can be hung on the solder strip body 201, and the hot melt layer 202 can be formed on the solder strip body 201 after the organic material in the molten state is cooled and solidified, so that the organic material is convenient to melt, the chemical property after melting is stable, and the preparation of the solder strip is convenient.
Meanwhile, the hot melt layer 202 is prepared from the organic material, so that on the first hand, the hot melt layer 202 is ensured to have good hydrophobicity, the photovoltaic module can be prevented from being infected by water vapor, and the welding strip is prevented from being separated from the battery piece due to the water vapor; in the second aspect, the good viscosity of the hot-melt layer 202 is ensured, and the battery piece can be better bonded after the hot-melt layer 202 is melted.
In some examples, the organic material includes: at least one of polyethylene octene co-elastomer, ethylene-vinyl acetate and polyolefin thermoplastic elastomer and a cross-linking agent.
The organic material for preparing the hot melt layer 202 can comprise at least one of polyethylene octene co-elastomer, ethylene-vinyl acetate and polyolefin thermoplastic elastomer, and the preparation of the solder strip is facilitated, the hydrophobicity and the viscosity of the hot melt layer 202 are ensured, and meanwhile, the light transmittance of the hot melt layer 202 can be improved, so that the hot melt layer 202 is close to a transparent state, the light shielding property of the solder strip can be greatly reduced, the optical loss of a photovoltaic module can be further reduced, and the power generation efficiency of the photovoltaic module is improved.
The material for preparing the hot melt layer 202 comprises a cross-linking agent, when the ambient temperature of the welding strip is higher than the melting point of the hot melt layer 202, the cross-linking agent can be cross-linked with at least one material of polyethylene octene co-elastomer, ethylene-vinyl acetate and polyolefin thermoplastic elastomer, so that the chemical property of the hot melt layer 202 can be stabilized, the melting point of the hot melt layer 202 can be further increased, the hot melt layer 202 is heated again, the hot melt layer 202 can be melted by breaking through the new melting point of the hot melt layer 202, and then the temperature is reduced to solidify the hot melt layer 202, so that the welding strip can be installed.
In some examples, the solder strip body 201 is cylindrical, and the solder strip body includes: a metal pillar 211; a metal layer 212 coated on the metal pillar 211, and a hot melt layer 202 coated on the metal layer 212; the material used for preparing the metal pillar 211 is different from the material used for preparing the metal layer 212, and the material used for preparing the metal layer 212 includes tin.
The solder strip body 201 is columnar, and the hot melt layer 202 cladding is on the solder strip body 201 for the solder strip becomes the column, can make the solder strip possess good refraction effect, can make photovoltaic module higher to the availability factor of light energy.
Weld and take body 201 to include metal column 211 and metal level 212, it is bilayer structure to weld and take body 201, and inlayer and outer material are different, a material for preparing metal level 212 has included tin, after hot melt layer 202 melts, it can be preferential to contact with the battery piece to be located to weld and take body 201 outer metal level 212, then hot melt layer 202 melts once more and can fix on the battery piece with welding and take body 201, select through tin material, can make the combination effect of metal level 212 and battery piece better, the passivation effect is better, can avoid metal level 212 wearing and tearing or destroy the battery piece, do benefit to and reduce the holistic resistivity of battery body.
The metal column 211 and the metal layer 212 are made of different materials, the metal layer 212 can be made of a material with a better bonding effect with the cell, the metal column 211 is located inside the solder strip body 201, and the metal column 211 cannot be in direct contact with the cell, so that the metal column 211 can be made of a material with lower resistivity, and power loss of the photovoltaic module in the current collection process is reduced.
In some examples, the material from which the metal posts 211 are made includes at least one of copper, silver, and gold.
The material for preparing the metal column 211 can comprise at least one of copper, silver and gold, and the resistivity of the metal column 211 can be reduced through the selection of the material, so that the power loss of the photovoltaic module in the current collection process is reduced, and the power generation efficiency of the photovoltaic module is improved.
In some examples, the metal posts 211 are 100 to 350 microns in diameter; the thickness of the metal layer 212 is 5 to 20 micrometers; the thickness of the hot melt layer 202 is 10 to 3000 micrometers.
The diameter of the metal column 211 is 100 micrometers to 350 micrometers, so that the metal column 211 occupies most of the volume of the solder strip, and the metal column 211 is made of a material with low resistivity, so that the overall resistivity of the solder strip is favorably reduced, and the mechanical strength of the solder strip can be improved.
The thickness of the metal layer 212 is 5 micrometers to 20 micrometers, and the metal layer 212 plays a role in better contacting with a battery piece, so that the thickness of the metal layer 212 is lower than the wire diameter of the metal column 211, on one hand, the preparation of the metal layer 212 is facilitated, a layer of molten metal can be wrapped on the metal column 211 only by enabling the metal column 211 to penetrate through molten metal tin in the preparation process, and the metal layer 212 can be formed after the metal tin is solidified; on the other hand, the cost of the welding strip is reduced.
The thickness of the hot melt layer 202 is 10-3000 microns, and the thickness of the hot melt layer 202 is reduced as much as possible while the solder strip can be firmly fixed on the battery body through the selection of the thickness range, so that the preparation of the hot melt layer 202 is facilitated, and the cost of the solder strip is reduced.
Preferably, the thickness of the hot melt layer 202 is 10 to 1000 micrometers.
It can be understood that the wire diameter of the solder strip is between 115 micrometers and 400 micrometers through the determination of the wire diameter of the metal column 211 and the determination of the thicknesses of the metal layer 212 and the hot melt layer 202, so that the wire diameter of the solder strip is greatly reduced, the light shielding performance of the solder strip is reduced, the optical loss of a photovoltaic module is favorably reduced, and the power generation efficiency of the photovoltaic module can be improved.
In some examples, the number of the thermal melting layers 202 is multiple, the multiple thermal melting layers 202 are coated on the solder strip body 201 at intervals, and the solder strip body 201 between two adjacent thermal melting layers 202 is in an exposed state.
The number of the hot melt layers 202 can be multiple, and multiple hot melt layers 202 can be arranged on the solder strip body 201 at intervals, that is, the hot melt layers 202 can be discontinuous, so that the use of the material of the hot melt layers 202 can be reduced, and the hot melt layers 202 are formed only in the area where the solder strip needs to be fixed, which is beneficial to reducing the cost of the solder strip.
In some examples, the photovoltaic module further comprises: and a bus bar, at least two of the battery pieces 100 being connected in series by the conductor members 200 to form a battery string, the bus bar being provided at an end of the battery string, the bus bar being connected to the conductor members 200 on the battery pieces 100 at the end of the battery string.
At least two battery strings can be connected in parallel through the bus bar to form a battery piece 100 array, and the current output by the battery piece 100 array is utilized, so that the conversion from solar energy to electric energy can be completed.
In some examples, the photovoltaic module further comprises: and an adhesive layer disposed between the conductor member 200 and the fixing layer 300 and/or between the adhesive layer and the battery sheet 100.
The photovoltaic module may further include an adhesive layer such that there is an adhesive relationship between the conductor 200 and the fixing layer 300 and/or the cell sheet 100.
It can be understood that the adhesive layer may be annularly coated on the conductor 200 to enable the conductor 200 to be better bonded with the battery piece 100 and the fixing layer 300, or may be distributed at intervals in a dotted manner, so that while the bonding strength is ensured, the amount of glue used is reduced to ensure the light transmittance of the photovoltaic module.
As shown in fig. 3 and 4, in some examples, the fixing layer 300 includes: the bonding layer 303, wherein the melting point of the bonding layer 303 is 60-120 ℃; and the isolating layer 304 is connected with the bonding layer 303, and the melting point of the isolating layer 304 is greater than or equal to 150 ℃.
In the technical solution, a structure of the fixing layer 300 is further provided, the fixing layer 300 may be a multilayer structure, that is, the fixing layer 300 may include an adhesive layer 303 and an isolation layer 304 connected to the adhesive layer, where a melting point of the adhesive layer 303 is 60 ℃ to 120 ℃, the fixing layer 300 may be connected to the battery piece 100 through the adhesive layer 303, and the isolation layer 304 does not need to have an adhesive property, and the isolation layer 304 may play a role of isolation, and may protect the battery piece 100 to prevent the battery piece 100 from being worn.
The melting point of the isolation layer 304 is greater than or equal to 150 ℃, so that the fixed layer 300 cannot be damaged due to overhigh temperature of the working environment in the use process of the photovoltaic module, and the service life and the working stability of the photovoltaic module can be greatly improved.
As shown in fig. 4, in some examples, the fixed layer 300 further includes: and a plurality of organic layers 305 disposed between the adhesive layer 303 and the spacer layer 304.
The fixing layer 300 may further include a plurality of organic layers 305 in addition to the adhesive layer 303 and the isolation layer 304, and the fixing layer 300 may have good ductility and stable chemical properties by disposing the plurality of organic layers 305, it is understood that materials between the plurality of organic layers 305 may be different, and such a configuration may further improve the corrosion resistance of the fixing layer 300, and may enable the operation of the photovoltaic module to be more stable.
It can be understood that the light transmittance of the organic layer 305, the adhesive layer 303 and the isolation layer 304 is higher than 80% to ensure the power generation efficiency of the photovoltaic cell.
As shown in fig. 5, according to a second aspect of the embodiments of the present application, there is provided a method for manufacturing a photovoltaic module, the method for manufacturing a photovoltaic module according to any one of the above aspects, the method including:
step 101: providing a battery piece, and preheating the battery piece for one time. Through once preheating the battery piece, can rise the temperature of battery piece, when the fixed bed contacted with the battery piece, the fixed bed can be melted, can make the fixed bed bond in the battery piece more firmly.
Step 102: and connecting the conductor part to two adjacent battery plates through the fixing layer to obtain the battery string. After the battery piece preheats once, the temperature of battery piece can exceed the melting point of fixed layer, then with conductor setting in anticipated mounted position, again with the fixed layer laminating on the battery piece, the fixed layer can melt under the high temperature effect of battery piece, wait to realize after the fixed layer solidifies once more that conductor passes through the fixed layer and is connected with the battery piece. It can be understood that the temperature of the battery piece is adopted in the embodiment of the application to provide for the melting of the fixing layer, so that the fixing layer is more conveniently and accurately mounted compared with the fixing layer which is directly melted; on the other hand, the cross-linking reaction of the fixing layer can be delayed, and the conductor can be firmly connected to the battery piece.
Step 103: and carrying out secondary preheating on the battery string in a pressing state. Carry out the secondary to the battery cluster under the state of exerting pressure and preheat, can make the fixed layer connect in the battery piece more firmly, can guarantee photovoltaic module's joint strength.
The photovoltaic module prepared by the preparation method provided by the embodiment of the application comprises at least two battery pieces, a conductor and a fixed layer, wherein the conductor is connected to the two adjacent battery pieces through the fixed layer to realize the series connection of the two adjacent battery pieces and realize the confluence of the photovoltaic module, and the melting point of one side, facing the battery pieces, of the fixed layer is 60-120 ℃, so that the conductor can be bonded on the battery pieces in a mode of melting the fixed layer in the preparation process of the photovoltaic module, the welding process in the traditional technology is replaced, the series connection of the battery pieces can be realized under the temperature condition of 60-120 ℃, the temperature of the circuit interconnection of the battery pieces is greatly reduced, the photovoltaic module can be protected, the damage of the battery pieces of the photovoltaic module due to overhigh welding temperature is avoided, and the service life and the performance of the photovoltaic module are improved.
It can be understood that, the fixed layer can be multilayer structure, and the fixed layer can include articulamentum and substrate layer, and the melting point of articulamentum is 60 ℃ to 120 ℃, and the articulamentum is connected in the substrate layer, and the articulamentum is used for melting in order to connect the conductor in the battery piece, and can improve the mechanical strength of fixed layer through the setting of substrate layer, ensures the wear resistance of fixed layer, when the fixed layer with the conductor laminating in the battery piece for the effect of auxiliary protection can be compromise to the fixed layer.
It can be understood that the fixed layer can also be of a single-layer structure, so that the fixed layer can be produced and processed conveniently, when the conductor is attached to the battery piece on the fixed layer of the single-layer structure, the fixed layer of the single-layer structure can also play a certain auxiliary protection role, the conductor can be prevented from contacting with external air, the probability that the conductor is abraded can be reduced, and the service life can be prolonged.
It is understood that, in order to secure the power generation performance of the photovoltaic module, the light transmittance of the anchor layer needs to be greater than or equal to 70%.
In some examples, the temperature of the primary pre-heating is 80 ℃ to 120 ℃; the temperature of the secondary preheating is 80 ℃ to 160 ℃.
The temperature of primary preheating is 80-120 ℃, so that the temperature of the battery piece is 80-120 ℃, and when the fixing layer is contacted with the battery piece, the fixing layer can be melted by the heat energy of the battery piece to fix the conductor piece. The temperature of the secondary preheating is 80 ℃ to 160 ℃, the temperature of the secondary preheating can be slightly higher than that of the primary preheating, and the curing effect of the fixed layer can be enhanced.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A photovoltaic module, comprising:
at least two battery pieces;
a conductor;
the conductor is connected to the battery pieces through the fixing layer, so that two adjacent battery pieces are connected in series, and the melting point of one side, facing the battery pieces, of the fixing layer is 60-120 ℃.
2. The photovoltaic module of claim 1, wherein the material from which the anchor layer is made comprises:
the base material comprises at least one of polyester resin, polyethylene octene co-elastomer, ethylene-vinyl acetate and polyolefin thermoplastic elastomer.
3. The photovoltaic module of claim 2 wherein the material from which the anchor layer is made further comprises:
a crosslinking agent for performing a crosslinking reaction with the substrate after the substrate is melted.
4. The photovoltaic module of claim 1,
each battery piece comprises a first face and a second face which are arranged oppositely, and the conductor piece is connected with the first face of one of two adjacent battery pieces and the second face of the other of the two adjacent battery pieces through the fixing layer.
5. The photovoltaic module of claim 1, wherein the anchor layer comprises:
the first fixing layer is used for being connected to the first surface of the battery piece;
the second fixing layer is used for being connected to the second surface of the battery piece;
wherein the first and second fixing layers have a light transmittance of 70% or more.
6. The photovoltaic assembly of any of claims 1 to 5, wherein the conductor comprises:
a weld band body;
and the hot melting layer is coated on the welding strip body and is made of a material with the melting point of 50-500 ℃.
7. The photovoltaic module of any one of claims 1 to 5, further comprising:
the bus bar is arranged at the end part of the battery string and is connected with the conductor on the battery sheet at the end part of the battery string;
and the adhesive layer is arranged between the conductor part and the fixing layer and/or between the adhesive layer and the battery piece.
8. The photovoltaic module of claim 1, wherein the anchor layer comprises:
the adhesive layer has a melting point of 60-120 ℃;
the isolating layer is connected to the bonding layer, and the melting point of the isolating layer is greater than or equal to 150 ℃.
9. The photovoltaic module of claim 8, wherein the anchor layer further comprises:
a plurality of organic layers disposed between the adhesive layer and the barrier layer.
10. A method for producing a photovoltaic module, for producing the photovoltaic module according to any one of claims 1 to 9, comprising:
providing a battery piece, and preheating the battery piece for the first time;
connecting the conductor part to two adjacent battery sheets through the fixing layer to obtain a battery string;
and carrying out secondary preheating on the battery string in a pressing state.
11. The production method according to claim 10,
the temperature of the primary preheating is 80-120 ℃;
the temperature of the secondary preheating is 80 ℃ to 160 ℃.
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| CN202210111527.6A CN114597277A (en) | 2022-01-29 | 2022-01-29 | Photovoltaic module and preparation method thereof |
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| CN202210111527.6A CN114597277A (en) | 2022-01-29 | 2022-01-29 | Photovoltaic module and preparation method thereof |
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