CN113725312A - Photovoltaic module and method for producing photovoltaic module - Google Patents
Photovoltaic module and method for producing photovoltaic module Download PDFInfo
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- CN113725312A CN113725312A CN202110950631.XA CN202110950631A CN113725312A CN 113725312 A CN113725312 A CN 113725312A CN 202110950631 A CN202110950631 A CN 202110950631A CN 113725312 A CN113725312 A CN 113725312A
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- battery
- photovoltaic module
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- conductive
- transparent adhesive
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Images
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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
-
- 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
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022433—Particular geometry of the grid contacts
-
- 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
- H01L31/0508—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 the interconnection means having a particular shape
-
- 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
-
- 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
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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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
- Manufacturing & Machinery (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a photovoltaic module and a manufacturing method of the photovoltaic module. The photovoltaic module includes: a plurality of battery pieces, the battery piece includes: the battery comprises a battery body, a first electrode and a second electrode, wherein the first surface and the second surface are oppositely arranged; a plurality of grid lines arranged on the first surface of the battery body at intervals and extending along a first direction; and an electrode member disposed on the second surface of the battery body; the conductive connecting piece is connected with the grid lines of one of the battery pieces and the electrode elements of the adjacent battery pieces so as to electrically connect the two adjacent battery pieces, and extends along a second direction which is intersected with the first direction; and the transparent bonding piece is arranged on the first surface of the battery body so as to bond the conductive connecting piece to the battery body of the battery piece.
Description
Technical Field
The present invention relates to a photovoltaic module and a method of manufacturing the photovoltaic module.
Background
The photovoltaic module is formed by connecting a plurality of battery pieces in series. Grid lines are arranged on the battery piece to guide the photo-generated current inside the battery piece to the outside. Grid lines on a conventional battery sheet include thin grid lines for collecting electrons on the surface of the battery to form a current, and main grid lines for collecting the current on the thin grid lines. The photovoltaic module is mainly formed by connecting a plurality of battery pieces in series through a conductive connecting piece (such as a welding strip), and particularly, the conductive connecting piece is used for realizing the series connection of the plurality of battery pieces by welding main grid lines on adjacent battery pieces.
The main grid lines in the prior art are mostly formed by printing silver paste slurry, the preparation cost is high, the shading area of the main grid lines is large, and the photoelectric conversion efficiency of the cell is reduced. Moreover, when forming a photovoltaic module, the conductive connecting piece has high positioning requirements, otherwise the conductive connecting piece is easy to shift in the welding process, so that the formed photovoltaic module product has defects. Moreover, in general, the welding strength of the conductive connecting piece and the grid line is not large, poor contact is easy to occur, and the reliability of the photovoltaic module is affected.
Therefore, the technical problems to be solved in the art are to reduce the manufacturing cost of the photovoltaic module, improve the photoelectric conversion efficiency of the photovoltaic module, and improve the connection reliability between the conductive connecting piece and the grid line in the photovoltaic module.
Disclosure of Invention
The invention aims to provide a novel photovoltaic module, which is used for reducing the preparation cost of the photovoltaic module, improving the photoelectric conversion efficiency of the photovoltaic module and improving the connection reliability of a conductive connecting piece and a grid line in the photovoltaic module.
The invention discloses a photovoltaic module, comprising: a plurality of battery slices, the battery slices comprising: the battery comprises a battery body, a first electrode and a second electrode, wherein the first surface and the second surface are oppositely arranged; a plurality of gate lines disposed on the first surface of the battery body at intervals and extending in a first direction; and an electrode element disposed on the second surface of the battery body; at least one conductive connecting member connecting the plurality of gate lines of one of the plurality of battery pieces and the electrode elements of the adjacent battery piece to electrically connect the two adjacent battery pieces, the at least one conductive connecting member extending in a second direction, the second direction intersecting the first direction; and the transparent bonding piece is arranged on the first surface of the battery body so as to bond the conductive connecting piece to the battery body of the battery piece.
In one or more embodiments, the transparent adhesive is an insulator.
In one or more embodiments, the transparent adhesive member is located between two adjacent grid lines on the first surface.
In one or more embodiments, the conductive connector includes a first portion connected to the plurality of gate lines and a second portion connected to the electrode element, and a cross-section of the first portion is different from a cross-section of the second portion.
In one or more embodiments, the conductive connector includes a first portion connected to the plurality of gate lines and a second portion connected to the electrode element, and a cross-section of the first portion is the same as a cross-section of the second portion.
In one or more embodiments, the conductive connector includes a first portion connected to the plurality of gate lines and a second portion connected to the electrode element, the first portion having a cross-section of a circular shape or a triangular shape, and the second portion having a cross-section of a flat shape, a circular shape, or a triangular shape.
In one or more embodiments, the conductive connection member further includes a third portion transitionally connected between the first portion and the second portion and disposed between two adjacent battery pieces.
In one or more embodiments, the conductive connection member further includes a third portion, which is flat, connected between the first portion and the second portion, and disposed between two adjacent battery pieces.
In one or more embodiments, the photovoltaic module further includes a positioning member located on the cell body to position the transparent adhesive member.
In one or more embodiments, the photovoltaic module further includes a solder pad, and the conductive connector is connected to the gate line through the solder pad.
In one or more embodiments, the material of the bonding pad and the grid line comprises a metal filler and a resin matrix, and the content of the metal filler in the bonding pad is lower than that of the metal filler in the grid line.
In one or more embodiments, the conductive connector includes a core material and an outer coating, wherein the outer coating has a melting point temperature T1 that satisfies: t1 is more than or equal to 130 ℃ and less than or equal to 200 ℃.
In one or more embodiments, the transparent adhesive member is made of a thermosetting adhesive, and the curing temperature T2 of the thermosetting adhesive satisfies: t1 is not less than T2 is not less than 200 ℃.
In one or more embodiments, the transparent adhesive member is made of a hot-melt adhesive having a melting temperature T3 satisfying: t3 is less than or equal to T1.
In one or more embodiments, the transparent adhesive member is made of a light-curable adhesive.
In one or more embodiments, the height of the transparent adhesive member is less than or equal to the height of the gate line.
In one or more embodiments, the first surface is configured as a light receiving surface of the battery sheet.
In one or more embodiments, the at least one conductive connector is connected to the plurality of gate lines by soldering.
In one or more embodiments, the electrode member is a plurality of grid lines disposed on the second surface of the battery body at intervals from each other and extending in the first direction.
In one or more embodiments, the transparent adhesive member is further disposed on the second surface of the battery body to adhere the conductive connection member connected to the electrode member to the second surface of the battery body.
In one or more embodiments, the battery pieces are connected in a stitch welding mode.
In one or more embodiments, the second direction is perpendicular to the first direction.
The invention also discloses a manufacturing method of the photovoltaic module, which comprises the following steps: providing a plurality of battery slices, wherein the battery slices comprise: the battery comprises a battery body, a first electrode and a second electrode, wherein the first surface and the second surface are oppositely arranged; a plurality of gate lines disposed on the first surface of the battery body at intervals and extending in a first direction; and an electrode element disposed on the second surface of the battery body; forming a transparent adhesive member on a first surface of one of the plurality of battery pieces; providing at least one conductive connecting member, welding a first part of the at least one conductive connecting member to the plurality of grid lines of one of the plurality of battery pieces and adhering to the transparent adhesive member; connecting a second portion of the at least one conductive connection member to the electrode element on the second surface of an adjacent cell piece of the one of the plurality of cell pieces, wherein the at least one conductive connection member extends in a second direction that intersects the first direction.
In one or more embodiments, the step of forming the transparent adhesive member includes: spraying a thermosetting adhesive on the first surface of the battery piece; and heating the thermosetting adhesive at a temperature higher than the melting point of the outer coating of the conductive connector after the conductive connector is adhered to the hot-melt adhesive to be cured into the transparent adhesive.
In one or more embodiments, the step of forming the transparent adhesive member includes: spraying a hot-melt adhesive on the first surface of the battery piece; and solidifying the hot melt adhesive into the transparent adhesive member by cooling after adhering the conductive connecting member to the hot melt adhesive.
In one or more embodiments, the step of forming the transparent adhesive member includes: spraying a photo-curing adhesive on the first surface of the battery piece; and after the conductive connecting piece is adhered to the light-curing type adhesive, the light-curing type adhesive is cured into the transparent adhesive piece by irradiating ultraviolet light.
In one or more embodiments, before forming the transparent adhesive member, further comprising: and forming a positioning member on the battery body to determine the position of forming the transparent adhesive member.
In one or more embodiments, before providing the at least one conductive connection, further comprising: and forming a welding pad on the grid line so that the conductive connecting piece is welded to the grid line through the welding pad.
In one or more embodiments, the second direction is perpendicular to the first direction.
The technical scheme provided by the invention at least has the following beneficial effects:
according to the invention, only the thin grid lines are formed on the cell, so that the use of silver paste is reduced, the preparation cost is reduced, the specific structure is simplified, meanwhile, the shading area on the cell is effectively reduced, and the photoelectric conversion efficiency is improved. According to the photovoltaic module, the transparent bonding piece arranged on the cell body is used for fixedly connecting the conductive connecting piece to the cell, so that the conductive connecting piece is prevented from deviating or falling off in the manufacturing process, the connection reliability between the conductive connecting piece and the cell body in the photovoltaic module is improved, and meanwhile, the transparent bonding piece has high light transmittance, so that the shading area is reduced and the photoelectric conversion efficiency is improved under the condition that the conductive connecting piece is effectively positioned. The transparent bonding member can be an insulating transparent bonding member, namely, the transparent bonding member does not contain conductive particles, so that the bonding effect of the transparent bonding member can be prevented from being influenced by the conductive particles, the transmittance of the transparent bonding member can be effectively increased, and the cost is further reduced.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings of the present invention will be briefly introduced below, and the drawings in the following description relate to some embodiments only and do not limit the present invention.
FIG. 1 shows a top view of a monolithic cell used in forming a photovoltaic module according to a first embodiment of the present invention;
fig. 2 shows a top view of the connection of a cell sheet and an electrically conductive connection member in a photovoltaic module according to a first embodiment of the present invention;
FIG. 3 is an enlarged schematic view of the dashed box portion of FIG. 2;
fig. 4 shows a top view of two cells connected in series in a photovoltaic module according to a first embodiment of the invention;
fig. 5 shows a side view of two cell sheets connected in series in a photovoltaic module according to a first embodiment of the invention;
fig. 6 shows a side view of three cells connected in series in a photovoltaic module according to a first embodiment of the invention;
fig. 7 shows a top view of a cell sheet in a photovoltaic module according to a second embodiment of the present invention;
fig. 8 shows a side view of two cell sheets connected in series in a photovoltaic module according to a second embodiment of the present invention;
fig. 9 shows a side view of three cells connected in series in a photovoltaic module according to a second embodiment of the invention;
fig. 10 shows a top view of a cell sheet in a photovoltaic module according to a third embodiment of the present invention.
List of reference numerals
10 photovoltaic module
11 cell slice
110 cell body
111 grid line
112 positioning piece
113 bonding pad
12 conductive connecting piece
121 first part
122 second part
123 third part
13 transparent adhesive member
S1 first surface
S2 second surface
D1 first direction
D2 second direction
P1 weld location
P2 bond site
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
The invention discloses a photovoltaic module, comprising: a plurality of battery pieces, the battery piece includes: the battery comprises a battery body, a first electrode and a second electrode, wherein the first surface and the second surface are oppositely arranged; a plurality of grid lines arranged on the first surface of the battery body at intervals and extending along a first direction; and an electrode member disposed on the second surface of the battery body; the conductive connecting piece is connected with the grid lines of one of the battery pieces and the electrode elements of the adjacent battery pieces so as to electrically connect the two adjacent battery pieces, and extends along a second direction which is intersected with the first direction; and the transparent bonding piece is arranged on the first surface of the battery body so as to bond the conductive connecting piece to the battery body of the battery piece.
The transparent bonding piece is adopted to fixedly connect the conductive connecting piece to the cell piece, so that the conductive connecting piece is prevented from deviating or falling off in the manufacturing process, the connection reliability between the conductive connecting piece and the cell body in the photovoltaic module is improved, and meanwhile, the transparent bonding piece has high light transmittance, so that the shading area can be reduced and the photoelectric conversion efficiency can be improved under the condition of ensuring the effective positioning of the conductive connecting piece. The transparent bonding member can be an insulating transparent bonding member, namely, the transparent bonding member does not contain conductive particles, so that the bonding effect of the transparent bonding member can be prevented from being influenced by the conductive particles, the transmittance of the transparent bonding member can be effectively increased, and the cost is further reduced.
It should be noted that the cell body is a part of the cell that can receive light and convert light energy into electric energy, and the invention is not limited to the specific structure of the cell body. In one embodiment, the cell body may be a single-sided power generating cell body including a front surface antireflection film, an n-type doped emission layer, a p-type silicon layer, and an aluminum layer, which may receive light from one side of the front surface antireflection film and convert light energy into electric energy. In another embodiment, the cell body may be a double-sided power generating cell body including a front surface antireflection film, a boron doped emission layer, an n-type silicon layer, a phosphorus doped back field layer, and a back surface antireflection film, which may receive light from a side of the front surface antireflection film and a side of the back surface antireflection film and convert light energy into electric energy.
In order that the invention may be more clearly understood, embodiments of the invention are described in detail below with reference to the accompanying drawings.
Fig. 1-6 depict a first embodiment of the present invention, wherein fig. 1 shows a top view of an entire cell sheet in a photovoltaic module; FIG. 2 shows a top view of the connection of a cell and a conductive connector in a photovoltaic module; FIG. 3 is an enlarged schematic view of a dashed box portion of the cell shown in FIG. 2; fig. 4 shows a top view of two cells connected in series in a photovoltaic module; fig. 5 shows a side view of two cells connected in series in a photovoltaic module; fig. 6 shows a side view of three cells connected in series in a photovoltaic module.
Referring to fig. 1 to 6, a photovoltaic module 10 includes a plurality of cells 11, a conductive connecting member 12 and a transparent adhesive member 13. As shown in fig. 1, the battery cell 11 includes a battery body 110 and grid lines 111 (the "grid lines 111" in the embodiment of the present invention are thin grid lines or minor grid lines in the prior art, rather than main grid lines). The battery body 110 includes a first surface S1 and a second surface S2 which are oppositely disposed, and a plurality of gate lines 111 are disposed on the first surface S1 and the second surface S2 of the battery body 110 at intervals from each other and extend in a first direction D1. The gate line 111 has good conductive performance and may be made of a conductive paste including a metal filler and a resin matrix, wherein the metal filler may include at least one of silver particles, nickel-coated carbon particles, silver-coated nickel particles, silver-coated carbon particles, silver-coated aluminum particles, and silver-coated copper particles.
The battery cell 11 shown in fig. 1 is a one-piece battery cell, however, the present invention is not limited thereto, and for example, the battery cell 11 may be an 1/2 battery cell, a 1/3 battery cell, a 1/4 battery cell, or the like, depending on actual requirements.
The transparent adhesive 13 is disposed on the first surface S1 and the second surface S2 of the battery body 110, and is used for adhering the conductive connecting member 12 to the battery body 110. Wherein the transparent adhesive 13 is transparent to visible light, for example, the transmittance to visible light with wavelength in the range of 390-780nm is greater than 70%, preferably greater than 80% or greater than 90%, so as to effectively reduce the light shielding area and increase the light utilization rate. Preferably, the transparent adhesive member 13 is an insulating member, i.e., does not contain conductive particles therein, whereby the decrease of the adhesive effect due to the presence of the conductive particles can be prevented, and the transmittance of the transparent adhesive can be effectively increased and the manufacturing cost can be reduced. The transparent adhesive member 13 is selectively located between two adjacent gate lines 111 on the first surface S1, and a size of the transparent adhesive member 13 in the second direction D2 is smaller than a distance between two adjacent gate lines 111, that is, the transparent adhesive member 13 does not contact any gate line 111, so as to avoid affecting conductivity of the gate lines 111.
The transparent adhesive member 13 may be made of a thermosetting adhesive, a hot-melt adhesive, or a photo-curing adhesive. The thermosetting adhesive is cured by a chemical reaction when heated to a certain temperature, and the change is irreversible. The material of the thermosetting adhesive can comprise a reactive diluent and a prepolymer, wherein the reactive diluent can be at least one of hydroxyethyl acrylate and isoborneol acrylate; the prepolymer can be at least one of epoxy acrylate, polyurethane acrylate and organic silica gel. Preferably, the curing temperature T2 of the thermosetting adhesive satisfies: t1 ≦ T2 ≦ 200 deg.C, where T1 is the melting point temperature of the exterior coating of the conductive connection member 12 (described later).
The hot melt type adhesive melts, reacts, or is cross-linked at a high temperature, and solidifies after cooling. The hot melt adhesive may be a reactive or cross-linked hot melt adhesive. For example, the hot melt adhesive may be: contains the prepolymer of polyurethane, polyethylene-polyvinyl acetate or ethylene-octylene copolymer. Preferably, the melting temperature T3 of the hot melt adhesive satisfies: t3 ≦ T1, where T1 is the melting point temperature of the exterior coating of the conductive connection 12.
The light-cured adhesive is an adhesive cured under the irradiation of ultraviolet light, and the material of the light-cured adhesive comprises a photosensitizer, a reactive diluent and a prepolymer, wherein the photosensitizer can be at least one of benzoin ether and benzophenone; the active diluent can be at least one of hydroxyethyl acrylate and isobornyl acrylate; the prepolymer can be at least one of epoxy acrylate, polyurethane acrylate and organic silica gel.
The conductive connection member 12 connects two adjacent battery cells 11 in series as shown in fig. 5 and 6. At least one conductive connecting member 12 is provided, and at least one conductive connecting member 12 is connected to the plurality of gate lines 111 by soldering, and the plurality of conductive connecting members 12 are mainly used for explanation in the present invention, as shown in fig. 4. The conductive connector 12 extends along a second direction D2, the second direction D2 intersecting the first direction D1. Preferably, the second direction D2 is perpendicular to the first direction D1. The conductive connector 12 includes a first portion 121 and a second portion 122. The first portion 121 of the conductive connecting member 12 crosses and is welded to the plurality of grid lines 111 on the first surface S1 of the battery piece 11, and the first portion 121 is fixedly bonded to the battery body 110 through the transparent bonding member 13, as shown in fig. 3, for details, the welding position P1 between the conductive connecting member 12 and each grid line 111 and the bonding position P2 between the transparent bonding member 13 and the conductive connecting member 12 are shown. The second portion 122 of the conductive connecting member 12 is connected to the plurality of grid lines 111 of the second surface S2 of another cell piece 11 (e.g., the cell piece at the left side of fig. 5 or the middle of fig. 6) by welding, and the second portion 122 is fixedly bonded to the cell body 110 of another cell piece 11 via the transparent bonding member 13. The height of the transparent adhesive 13 is less than or equal to the height of the gate line 111, so as to avoid the defect of large welding stress between the conductive connecting piece 12 and the gate line 111 caused by the large height to support the conductive connecting piece 12. The conductive connecting piece 12 is positioned on the cell body 11 through the gluing effect of the transparent gluing piece 13, so that the defects that the conductive connecting piece is difficult to position and easy to separate in the prior art are overcome, and the reliability of the photovoltaic module is effectively improved.
In the present embodiment, the first portion 121 and the second portion 122 of the conductive connecting member 12 are different in cross section. The cross section of the first portion 121 may be circular to improve the utilization rate of light when the first surface S1 is a light receiving surface, because the contact surface between the first portion 121 with the grid line 111 is small, light is prevented from being blocked to the maximum extent, and light is reflected to the battery body 11. Of course, the cross section of the first portion 121 may also be polygonal or other irregular shapes, such as a triangle, as long as the contact surface with the gate line 111 is small and the oblique incident light can be utilized. The cross section of the second portion 122 of the conductive connecting member 12 may be flat, for example, rectangular or any shape having a larger contact surface with the gate line 111 and a smaller thickness, so as to increase the welding area, improve the welding strength, improve the reliability of the connection effect of the conductive connecting member 12, and reduce the overall thickness of the photovoltaic module. For example, the ratio of the length to the thickness of the cross section of the flat conductive connector 12 is greater than 2: 1, or greater than 3: 1 or greater than 5: 1.
preferably, the conductive connection member 12 of the present invention may further include a third portion 123 transitionally connected between the first portion 121 and the second portion 122, and disposed between two adjacent cells 11, so as to avoid the defect of excessive stress caused by abrupt change of the cross section, and reduce the probability of cracks and splinters during the manufacturing process of the photovoltaic module. Here, the third portion 123 being "transitionally connected" between the first portion 121 and the second portion 122 means that the third portion 123 is connected between the first portion 121 and the second portion 122, and the cross-sectional shape of the third portion 123 transits from the cross-sectional shape of the first portion 121 to the cross-sectional shape of the second portion 122. As shown in fig. 5 and 6, two adjacent battery plates are stitch-welded, and in detail, two adjacent battery plates 11 have an overlapping region at the third portion 123 of the conductive connecting member 12, and the length of the overlapping region in the second direction D2 is preferably between 0 and 1mm, so that two adjacent battery plates 11 can be connected without a seam and the arrangement density thereof is increased.
The conductive connecting member 12 is preferably a low melting point solder strip to save energy consumption and avoid damage to the battery plate due to too high welding temperature. The conductive connector 12 includes a core material and an outer coating, wherein the core material may be copper with a purity of greater than 99.9%; the exterior coating may include one or more of tin, bismuth, lead, silver, antimony, indium, and cadmium, such as an alloy made of different proportions of different ones of tin, bismuth, lead, silver, antimony, indium, and cadmium, such as Sn43Pb43Bi14 (i.e., about 43%, 14% by mass of Sn, Pb, and Bi, respectively, in the alloy composition), Sn60Bi38Ag2 (i.e., about 60%, 38%, 2% by mass of Sn, Bi, and Ag, respectively, in the alloy composition), and so forth. Preferably, the melting point temperature T1 of the external coating satisfies: t1 is more than or equal to 130 ℃ and less than or equal to 200 ℃.
Fig. 5 of the present embodiment shows the series connection of two cells in the photovoltaic module, and fig. 6 shows the series connection of three cells in the photovoltaic module, although the photovoltaic module of the present invention may also include more cells, and the connection relationship is as above. Of course, the photovoltaic module also has a package portion, a panel, a back plate, a junction box, a frame and other components, but these are not the main points of the present invention and are well known to those skilled in the art, and therefore, they are not described herein again.
The photovoltaic module 10 of the present invention includes: a plurality of battery pieces 11, a conductive connecting member 12 and a transparent adhesive member 13. The battery piece 11 includes a battery body 110 and a plurality of grid lines 111, the grid lines 111 are disposed on the first surface S1 and the second surface S2 of the battery body 110 at intervals, and extend along a first direction D1; the conductive connectors 12 are connected to the plurality of grid lines 111 on different surfaces of two adjacent battery cells at intervals and extend along a second direction D2, the second direction D2 intersects the first direction D1, and preferably, the second direction D2 is perpendicular to the first direction D1; the transparent adhesive 13 is disposed on the first surface S1 and the second surface S2 of the battery body 110 to adhere the conductive connecting member 12 to the battery body 110.
Compared with the prior art, the photovoltaic module of the first embodiment of the invention has at least the following advantages: firstly, because the grid lines 111 are formed only on the cell pieces 11 and the main grid is not formed, the usage amount of silver paste is reduced, the preparation cost is reduced, the specific structure is simplified, about 1% -5% of the shading area on the cell pieces 11 is reduced, and the photoelectric conversion efficiency is improved. Secondly, the transparent bonding member 13 is used for positioning the conductive connecting member 12 on the cell 11, so that the conductive connecting member 12 can be prevented from shifting or falling off in the manufacturing process, the reliability of the photovoltaic module is improved, and meanwhile, the transparent bonding member 13 has high light transmittance, so that light cannot be shielded, and the photoelectric conversion efficiency is reduced. Thirdly, the transparent adhesive member 13 used in the present invention is an insulating transparent adhesive member, i.e. it does not contain conductive particles, thereby preventing the conductive particles from affecting the adhesive effect thereof, and effectively increasing the transmittance of the transparent adhesive member and further reducing the cost. Fourthly, the conductive connecting piece is the low-melting-point welding strip, so that the conductive connecting piece and the grid line can be directly connected by low-temperature welding, energy consumption is saved, resistance is reduced, current transmission efficiency is improved, meanwhile, damage of welding temperature to the battery piece is avoided, and reliability of the photovoltaic module is improved. Fifth, the invention adopts the first part (the cross section is circular) of the conductive connecting piece to connect with the first surface of the battery piece, and adopts the second part (the cross section is flat) of the conductive connection to connect with the second surface of another battery piece, thereby not only increasing the light utilization rate of the first surface, but also improving the welding strength of the second surface.
Fig. 7-9 depict a second embodiment of the present invention. Wherein fig. 7 shows a top view of the cell sheet of this second embodiment; fig. 8 shows a side view of two cell sheets in series in a photovoltaic module of a second embodiment; fig. 9 shows a side view of three cell sheets connected in series in the photovoltaic module of the second embodiment.
In the description of the second embodiment of the present invention, only the details different from the first embodiment are described, the related details identical to those of the first embodiment are not repeated herein, and for the same components, the same reference numerals as those of the first embodiment are used in the second embodiment.
The second embodiment of the present invention differs from the first embodiment as follows: first, referring to fig. 7, the battery piece 11 of the second embodiment includes a positioning member 112 in addition to the battery body 110 and the grid lines 111. The positioning element 112 is disposed on the battery body 110 and between the two grid lines 111, and is not in contact with the grid lines 111, and is mainly used for positioning the position of the transparent adhesive 13, in other words, the positioning element 12 is used for standardizing the adhesion range of the transparent adhesive 13. Specifically, the positioning member 112 has a marking function so as to determine the position where the transparent adhesive member 13 is formed. The positioning member 112 may be a circle, a square, a rectangle, or any other shape, and the positioning member 112 may be a solid pattern or a frame pattern, which is not limited in the present invention as long as the transparent adhesive member 13 can be positioned. Second, referring to fig. 8 and 9, the cross sections of the first portion 121 and the second portion 122 of the conductive connecting member 12 of the second embodiment are the same. The cross-sections may be circular to improve optical utilization on the first and second surfaces S1 and S2 of the battery body 110. Of course, the cross-section of the first and second portions 121 and 121 may be polygonal or irregular, as long as the contact surface with the gate line 111 is small and the obliquely incident light can be utilized. In addition, the third portion 123 of the conductive connecting member 12 may be flat to reduce the probability of cracks and splinters during the manufacturing process of the photovoltaic module, and the axis of the first portion 121 and the axis of the second portion 122 are vertically displaced to reduce the overall thickness of the photovoltaic module.
Compared with the prior art, the photovoltaic module of the second embodiment of the invention has the following advantages in addition to some of the advantages of the first embodiment: in the embodiment, the positioning piece is arranged on the battery body, so that the transparent bonding piece can be accurately positioned, and the influence on the electric conductivity of the grid line due to contact is avoided; furthermore, the present invention effectively increases the light utilization efficiency by providing the first and second portions of the conductive connecting member having the same cross section (e.g., circular shape). And through the design of the third part of the conductive connecting piece, the probability of hidden cracks and splinters of the photovoltaic module in the manufacturing process can be effectively reduced, and meanwhile, the overall thickness of the photovoltaic module is also reduced.
Fig. 10 depicts a third embodiment of the invention showing a top view of a cell sheet. In the description of the third embodiment of the present invention, only the details different from the first embodiment are described, the related details identical to those of the first embodiment are not repeated herein, and the same reference numerals as those of the first embodiment are used for the same components in the third embodiment.
The third embodiment of the present invention differs from the first embodiment as follows: first, referring to fig. 10, the battery piece 11 of the third embodiment includes a bonding pad 113 in addition to the battery body 110, the grid lines 111 and the transparent adhesive 13 (not shown, the structure and position of which are described in detail in the first embodiment). The pad 113 may be selectively disposed on the gate line 111, and the width of the pad 113 in the second direction D2 is greater than or equal to the width of the gate line 111 in the second direction D2, so as to increase the bonding area with the conductive connection 12. For the gate line 111 provided with the pad 113, the conductive connector 12 is connected to the gate line 111 by welding with the pad 113; for the gate line 111 without the pad 113, the conductive connector 111 is directly soldered to the gate line 111. The welding performance of the welding pad 113 can be better than that of the grid line 111 to enhance the welding strength of the conductive connecting piece 12 and the grid line 111, the welding pad 113 can be made of conductive paste, and the conductive paste comprises metal filler and a resin matrix, wherein the metal filler comprises at least one of silver particles, organic silica gel, nickel particles, nickel-coated carbon particles, silver-coated nickel particles, silver-coated carbon particles, silver-coated aluminum particles and silver-coated copper particles. The resin matrix in the conductive paste used for the bonding pad 113 may be different from the resin matrix in the conductive paste used for the gate line 111, wherein the resin matrix used for the bonding pad 113 is emphasized to have stronger adhesion, for example, stronger adhesion with a transparent conductive oxide on the surface of the battery. Specifically, the soldering pad 113 can adjust its solderability (i.e., the content of the metal filler in the soldering pad 113 is higher than that of the metal filler in the gate line 111) by adjusting the content (e.g., mass percentage) of the metal filler in the conductive paste, so that the solderability of the soldering pad 113 is better than that of the gate line 11. In addition, the material of the pad 113 may also be the same as that of the gate line 111, and the greater width of the pad 113 increases the welding strength between the gate line 111 and the conductive connection member 12. Second, the third embodiment can adopt the conductive connecting member 12 of the second embodiment, and the specific structure thereof is as that of the second embodiment, which is not described herein again.
Compared with the prior art, the photovoltaic module of the third embodiment of the present invention has some advantages of the first and second embodiments, and further has the following advantages: the design that this embodiment set up the weld pad on the grid line can improve the welding strength of electrically conductive connecting piece and grid line effectively, promotes photovoltaic module's reliability.
Of course, the present invention is not limited to the above three embodiments, and new embodiments can be formed by splitting and recombining, which are all within the protection scope of the present invention.
In the above embodiments disclosed in the present invention, the battery pieces are all double-sided battery pieces, that is, the battery pieces receive light from the first surface and the second surface and convert the light energy into electric energy. However, the present invention is not limited thereto, for example, the battery piece may be a single-sided battery piece, that is, the battery piece receives light only from the first surface and converts the light into electric energy, wherein the first surface S1 is configured as the light receiving surface of the battery piece 11, and in this case, since the light receiving area of the second surface does not need to be considered, other electrode elements which are more favorable for collecting electrons on the surface of the battery can be used instead of the grid lines on the second surface, but the other structures are the same as those of the double-sided battery piece.
When the electrode elements on the second surface of the single-sided cell are arranged as grids, the cell can be used as a double-sided cell. At this time, the electrode member is a plurality of grid lines which are disposed on the second surface of the battery body at intervals, extend in the first direction, are disposed on the second surface of the battery body at intervals, and extend in the first direction. In this embodiment, a transparent adhesive member is further disposed on the second surface of the battery body to adhere the conductive connecting member for connecting the electrode members to the second surface of the battery body.
In addition, the invention also discloses a manufacturing method of the photovoltaic module, which comprises the following steps: providing a plurality of battery pieces, wherein the battery pieces comprise: the battery comprises a battery body, a first electrode and a second electrode, wherein the first surface and the second surface are oppositely arranged; a plurality of grid lines arranged on the first surface of the battery body at intervals and extending along a first direction; and an electrode member disposed on the second surface of the battery body; forming a transparent adhesive member on a first surface of one of the plurality of battery pieces; providing at least one conductive connecting piece, welding a first part of the at least one conductive connecting piece to a plurality of grid lines of one of the plurality of battery pieces and adhering the first part to a transparent adhesive piece; and connecting a second portion of the at least one conductive connection member to the electrode element on the second surface of an adjacent one of the plurality of cells, wherein the at least one conductive connection member extends in a second direction that intersects the first direction.
The above-described manufacturing method can be used, for example, to form the photovoltaic modules according to the above-described first, second, and third embodiments.
As an example, the manufacturing method of the photovoltaic module according to the above-described first embodiment is as follows. Referring to fig. 1, a battery piece 11 is provided, which includes a battery body 110 and thin grid lines 111. The battery body 110 includes a first surface S1 and a second surface S2 that are oppositely disposed, and the gate lines 111 may be disposed on the first surface S1 and the second surface S2 of the battery body 110 by a printing process while being spaced apart from each other and extend in the first direction D1. Then, according to actual requirements, the battery piece 11 is laser cut into 1/2 battery pieces (as shown in fig. 2), 1/3 battery pieces or other battery pieces of any size, although the laser cutting may not be performed.
Then, a transparent adhesive is sprayed on the first surface S1 of the cell body 110 to form the transparent adhesive member 13, and the transparent adhesive is selectively sprayed between two adjacent grid lines 111. The transparent adhesive can be a thermosetting adhesive, a hot-melt adhesive or a light-curing adhesive, and the specific materials are as above.
After the transparent adhesive is sprayed, two adjacent cells 11 are connected in series using a conductive connection member 12, as shown in fig. 5. Specifically, the first portion 121 of the conductive connection member 12 is arranged on the first surface S1 of the battery cell 11, and crosses and contacts the plurality of grid lines 111 and contacts the transparent adhesive (arranged as shown in fig. 2), so that the first portion 121 of the conductive connection member 12 is positioned at a specific position by the adhesive action of the transparent adhesive before soldering. Then, the first portions 121 of the plurality of conductive connectors 12 are soldered to the plurality of grid lines 111 on the first surface S1 at one time, the conductive connectors 12 are soldered to the grid lines 111 at soldering positions P1 as shown in fig. 3, and the transparent adhesive 13 adheres the conductive connectors 12 to the battery body 110 at adhering positions P2. Subsequently, in the same manner as described above, a transparent adhesive is sprayed on the cell body 110 of the other cell piece 11 (particularly, on the second surface S2), and the second portion 122 of the conductive connection member 12 is arranged on the second surface S2 and contacts the plurality of grid lines 111 and the transparent adhesive, so that the second portion 122 of the conductive connection member 12 is positioned at a specific position by the adhesive action of the transparent adhesive before soldering. And the second portions 122 of the plurality of conductive connectors 12 are soldered to the plurality of gate lines 111 on the first surface S2 at one time, in the same details as the soldering details of the first portion 121 described above.
It should be noted that, when the transparent adhesive is a thermosetting adhesive, the step of forming the transparent adhesive member 13 includes: spraying a thermosetting adhesive on the first surface S1 of the battery piece 11; and after the conductive connecting member 12 is adhered to the hot melt type adhesive, the hot melt type adhesive is heated with a temperature higher than the melting point of the outer coating of the conductive connecting member 12 to be cured into the transparent adhesive member 13. In one embodiment, the curing temperature T2 of the thermosetting adhesive satisfies: t1 is more than or equal to T2 is more than or equal to 200 ℃, so that the conductive connecting piece 12 is welded on the grid line 111 while the thermosetting adhesive is cured. Preferably, T1 may be substantially 150 ℃, and T2 may be substantially the same as T1, so that the conductive connecting member 12 is soldered to the grid lines 111 and the conductive connecting member 12 is fixed to the battery body 110 at a soldering temperature of 150 ± 5 ℃, thereby completing the connection between the conductive connecting member 12 and the battery piece 11.
When the transparent adhesive is a hot-melt type adhesive, the step of forming the transparent adhesive member 13 includes: spraying hot-melt adhesive on the first surface S1 of the battery piece 11; and solidifying the hot melt adhesive into the transparent adhesive member 13 by cooling after the conductive connecting member 12 is adhered to the hot melt adhesive. In one embodiment, the melting temperature T3 of the hot melt adhesive satisfies: t3 is less than or equal to T1, so that the hot melt adhesive is in a molten state when the conductive connecting piece 12 is welded, the conductive connecting piece 12 is positioned by utilizing the adhesive property of the hot melt adhesive, and the hot melt adhesive is solidified along with the reduction of the temperature after the welding is finished.
When the transparent adhesive is a photo-curable adhesive, the step of forming the transparent adhesive member 13 includes: spraying a photo-curing adhesive on the first surface S1 of the battery piece 11; and after the conductive connector 12 is bonded to the photo-curable adhesive, the photo-curable adhesive is cured into the transparent adhesive 13 by irradiating ultraviolet light.
Of course, the invention is not limited to spraying the transparent adhesive on the battery body, and the transparent adhesive may be directly sprayed on the conductive connecting member, and then the conductive connecting member is adhered to the battery body and welded on each grid line.
This completes the series connection of two cells in the photovoltaic module, as shown in fig. 5. If it is desired to continue to connect more cells 11, the series connection can be performed by the same manufacturing method as described above, for example, spraying an adhesive on the first surface S1 of the other cell 11, welding the first portion 121 of the other conductive connecting member 12 (as shown in fig. 4), welding the second portion 122 of the conductive connecting member 12 to the second surface S2 of the third cell 11 (as shown in the left side of fig. 6), and so on, so as to form a series connection of three or more cells in the photovoltaic module. Of course, the photovoltaic module also needs to be packaged and formed with other processes, but the process is not the focus of the present invention and is well known to those skilled in the art, and thus, the description thereof is omitted.
The manufacturing method of the second embodiment of the present invention shown in fig. 7 to 9 is substantially the same as that of the first embodiment described above, with the only difference being: in this embodiment, before the transparent adhesive is sprayed, the positioning member 112 is formed on the cell body 110 to determine the position where the transparent adhesive 13 is formed. The positioning element 112 is preferably located between the two gate lines 111 and does not contact the gate lines 111. The positioning member 112 mainly serves as a marking and positioning member for determining the position of the transparent adhesive to be sprayed.
The manufacturing method of the third embodiment of the present invention shown in fig. 10 is substantially the same as the manufacturing method of the first embodiment described above, and the only difference is that: in this embodiment, before the conductive connector 12 is soldered, the pad 113 is selectively formed on the gate line 111, and then the conductive connector 12 is soldered to the pad 113 and the gate line 111, so that the conductive connector 12 is soldered to the gate line 111 through the pad 113. Of course, the bonding pad 113 may be formed on the conductive connecting member 12 first, and then the conductive connecting member 12 and the bonding pad 113 are soldered on the gate line 111.
In the above embodiments disclosed in the present invention, the double-sided cell is used for illustration, but the present invention is not limited thereto, for example, the cell may be a single-sided cell, and the manufacturing method of the photovoltaic module formed by the single-sided cell is substantially the same as the manufacturing method of the above embodiments of the present invention, and is not repeated herein.
In summary, the invention only forms the thin grid lines on the cell, thereby reducing the use of silver paste, reducing the preparation cost, simplifying the specific structure, effectively reducing the shading area on the cell and improving the photoelectric conversion efficiency. In addition, the transparent bonding piece is used for fixedly connecting the conductive connecting piece to the cell piece, so that the deviation or falling of the conductive connecting piece in the manufacturing process is avoided, the connection reliability between the conductive connecting piece and the cell body in the photovoltaic module is improved, and meanwhile, the transparent bonding piece has high light transmittance, so that the shading area can be reduced and the photoelectric conversion efficiency can be improved under the condition that the conductive connecting piece is effectively positioned. The transparent bonding member can be an insulating transparent bonding member, namely, the transparent bonding member does not contain conductive particles, so that the bonding effect of the transparent bonding member can be prevented from being influenced by the conductive particles, the transmittance of the transparent bonding member can be effectively increased, and the cost is further reduced. Moreover, the conductive connecting piece can be a low-melting-point welding strip, so that the conductive connecting piece and the grid line can be directly connected by low-temperature welding, the resistance is reduced, the current transmission efficiency is improved, meanwhile, the damage of the welding temperature to the battery piece is avoided, and the reliability of the photovoltaic module is improved. In addition, the transparent bonding piece can be positioned by utilizing the design of the positioning piece so as to avoid the influence on the electric conductivity of the grid line caused by the contact of the transparent bonding piece with the grid line. The invention can arrange the welding pad on the grid line so as to effectively improve the welding strength of the conductive connecting piece and the grid line.
The invention provides the following technical scheme:
The photovoltaic module according to claim 2 or 1, wherein the transparent adhesive member 13 is an insulating member.
The photovoltaic module according to claim 3 or 1, wherein the transparent adhesive 13 is located between two adjacent grid lines 111 on the first surface S1.
The photovoltaic module of claim 4, wherein the conductive connection 12 comprises a first portion 121 connected to the plurality of gate lines 111 and a second portion 122 connected to the electrode member, and a cross section of the first portion 121 is different from a cross section of the second portion 122.
The photovoltaic module of claim 5, wherein the conductive connection 12 comprises a first portion 121 connected to the plurality of gate lines 111 and a second portion 122 connected to the electrode element, and a cross section of the first portion 121 is the same as a cross section of the second portion 122.
The photovoltaic module according to claim 6 or 1, wherein the conductive connection member 12 includes a first portion 121 connected to the plurality of gate lines 111 and a second portion 122 connected to the electrode member, the first portion 121 has a circular or triangular cross-section, and the second portion 122 has a flat, circular or triangular cross-section.
The photovoltaic module according to claim 7, in any one of claims 4 to 6, wherein the conductive connection member 12 further includes a third portion 123 transitionally connected between the first portion 121 and the second portion 122 and disposed between two adjacent cell pieces 11.
The photovoltaic module according to claim 8 or any one of claims 4 to 6, wherein the conductive connecting member 12 further includes a third portion 123, which is flat, connected between the first portion 121 and the second portion 122, and disposed between two adjacent battery pieces 11.
Technical solution 9, the photovoltaic module according to technical solution 1, further comprising: and a positioning member 112 positioned on the battery body 110 to position the transparent adhesive member 13.
The photovoltaic module of claim 12, wherein the conductive connector 12 comprises a core material and an outer coating, wherein the outer coating has a melting point temperature T1 that satisfies: t1 is more than or equal to 130 ℃ and less than or equal to 200 ℃.
The photovoltaic module according to claim 13 or 12, wherein the transparent adhesive member 13 is made of a thermosetting adhesive, and a curing temperature T2 of the thermosetting adhesive satisfies: t1 is not less than T2 is not less than 200 ℃.
The photovoltaic module according to claim 14 or 12, wherein the transparent adhesive member 13 is made of a hot-melt adhesive, and a melting temperature T3 of the hot-melt adhesive satisfies: t3 is less than or equal to T1.
Technical solution 15, the photovoltaic module according to technical solution 1, wherein the transparent adhesive member 13 is made of a photo-curing adhesive.
The photovoltaic module according to claim 16, in which the height of the transparent adhesive 13 is less than or equal to the height of the gate line 111.
The photovoltaic module according to claim 17 or 1, wherein the first surface S1 is configured as a light receiving surface of the cell sheet 11.
The photovoltaic module of claim 18, wherein the at least one conductive connector 12 is connected to the plurality of grid lines 111 by soldering.
The photovoltaic module according to claim 19 or 1, wherein the electrode element is a plurality of grid lines 111 disposed on the second surface S2 of the cell body 110 at intervals and extending along the first direction D1.
The photovoltaic module according to claim 20 or 19, wherein the transparent adhesive 13 is further disposed on the second surface S2 of the cell body to adhere the conductive connecting member 12 connected to the electrode member to the second surface S2 of the cell body 110.
The photovoltaic module according to claim 21, wherein the adjacent two of the battery pieces 11 are connected by stitch welding.
The photovoltaic module of claim 22, claim 1, wherein the second direction D2 is perpendicular to the first direction D1.
Technical means 23, a method for manufacturing a photovoltaic module, comprising: providing a plurality of battery slices 11, wherein the battery slices 11 comprise: a battery body 110 having a first surface S1 and a second surface S2 disposed opposite to each other; a plurality of gate lines 111 disposed on the first surface D1 of the battery body 110 at intervals and extending in a first direction D1; and an electrode member disposed on the second surface S2 of the battery body 110; forming a transparent adhesive member 13 on the first surface S1 of one of the plurality of battery pieces 11; providing at least one conductive connecting member 12, soldering a first portion 121 of the at least one conductive connecting member 12 to the plurality of grid lines 111 of one of the plurality of battery pieces 11 and adhering to the transparent adhesive member 13; connecting the second portion 122 of the at least one conductive connection member 12 to the electrode element on the second surface S2 of the adjacent cell piece 11 of one of the plurality of cell pieces 11, wherein the at least one conductive connection member 12 extends along a second direction D2, and the second direction D2 intersects the first direction D1.
The method of manufacturing a photovoltaic module according to claim 24 or 23, wherein the step of forming the transparent adhesive member 13 includes: spraying a thermosetting adhesive on the first surface S1 of the battery piece 11; and after the conductive connecting member 12 is adhered to the hot melt type adhesive, heating the thermosetting type adhesive with a temperature higher than the melting point of the outer coating of the conductive connecting member 12 to be cured into the transparent adhesive member 13.
The method of manufacturing a photovoltaic module according to claim 25 or 23, wherein the step of forming the transparent adhesive member 13 includes: spraying hot-melt adhesive on the first surface S1 of the battery piece 11; and solidifying the hot melt adhesive into the transparent adhesive member 13 by cooling after adhering the conductive connecting member 12 to the hot melt adhesive.
The method of manufacturing a photovoltaic module according to claim 26 or 23, wherein the step of forming the transparent adhesive member 13 includes: spraying a light-curable adhesive on the first surface S1 of the battery piece 11; and after the conductive connecting member 12 is bonded to the photo-curable adhesive, curing the photo-curable adhesive into the transparent adhesive member 13 by irradiating ultraviolet light.
The method of manufacturing a photovoltaic module according to claim 27 or 23, wherein before the forming the transparent adhesive member 13, the method further comprises: a spacer 112 is formed on the battery body 110 to determine a position where the transparent adhesive member 13 is formed.
The method of claim 28, as recited in claim 23, wherein before providing the at least one conductive connection 12, the method further comprises: a pad 113 is formed on the gate line 111 such that the conductive connector 12 is soldered to the gate line 111 through the pad 113.
The method of manufacturing a photovoltaic module of claim 29, wherein the second direction D2 is perpendicular to the first direction D1.
Claims (10)
1. A photovoltaic module, comprising:
a plurality of battery slices (11), the battery slices (11) comprising:
a battery body (110) having a first surface (S1) and a second surface (S2) that are oppositely disposed;
a plurality of gate lines (111) disposed on the first surface (S1) of the battery body (110) at intervals from each other and extending in a first direction (D1); and
an electrode element disposed on the second surface (S2) of the battery body (110);
at least one conductive connection member (12), the conductive connection member (12) connecting the plurality of gate lines (111) of one of the plurality of battery pieces (11) and the electrode elements of the adjacent battery piece (11) to electrically connect the two adjacent battery pieces (11), the at least one conductive connection member (12) extending in a second direction (D2), the second direction (D2) intersecting the first direction (D1);
and the transparent adhesive piece (13) is arranged on the first surface (S1) of the cell body (110) so as to adhere the conductive connecting piece (12) to the cell body (110) of the cell piece (11).
2. The photovoltaic module of claim 1, wherein the transparent adhesive member (13) is an insulating member.
3. The photovoltaic module according to claim 1, wherein the transparent adhesive member (13) is positioned between two adjacent grid lines (111) on the first surface (S1).
4. The photovoltaic module of claim 1, wherein the conductive connection (12) comprises a first portion (121) connected to the plurality of grid lines (111) and a second portion (122) connected to the electrode element, the first portion (121) having a cross-section different from the cross-section of the second portion (122).
5. The photovoltaic module of claim 1, wherein the conductive connection (12) comprises a first portion (121) connected to the plurality of grid lines (111) and a second portion (122) connected to the electrode element, the first portion (121) having the same cross-section as the second portion (122).
6. The photovoltaic module of claim 1, wherein the conductive connection (12) comprises a first portion (121) connected to the plurality of grid lines (111) and a second portion (122) connected to the electrode element, the first portion (121) having a circular or triangular cross-section and the second portion (122) having a flat, circular or triangular cross-section.
7. The photovoltaic module according to any of claims 4 to 6, wherein the electrically conductive connection member (12) further comprises a third portion (123) transitionally connected between the first portion (121) and the second portion (122) and arranged between two adjacent cells (11).
8. The photovoltaic module according to any one of claims 4 to 6, wherein the electrically conductive connection member (12) further comprises a third portion (123) which is flat, is connected between the first portion (121) and the second portion (122), and is arranged between two adjacent cells (11).
9. The photovoltaic module of claim 1, further comprising: and the positioning piece (112) is positioned on the battery body (110) so as to position the transparent adhesive piece (13).
10. A method of manufacturing a photovoltaic module, comprising:
providing a plurality of battery slices (11), wherein the battery slices (11) comprise:
a battery body (110) having a first surface (S1) and a second surface (S2) that are oppositely disposed;
a plurality of gate lines (111) disposed on the first surface (D1) of the battery body (110) at intervals from each other and extending in a first direction (D1); and
an electrode element disposed on the second surface (S2) of the battery body (110);
forming a transparent adhesive member (13) on a first surface (S1) of one of the plurality of battery pieces (11);
providing at least one conductive connector (12), soldering a first portion (121) of the at least one conductive connector (12) to the plurality of grid lines (111) of one of the plurality of battery cells (11) and adhering to the transparent adhesive (13);
connecting a second portion (122) of the at least one electrically conductive connection member (12) to an electrode element on a second surface (S2) of an adjacent cell piece (11) of one of the plurality of cell pieces (11), wherein the at least one electrically conductive connection member (12) extends in a second direction (D2), the second direction (D2) intersecting the first direction (D1).
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