Classifications

• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
  • H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
  • H10F19/90—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers
  • H10F19/902—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers for series or parallel connection of photovoltaic cells
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
  • H10F71/00—Manufacture or treatment of devices covered by this subclass
• • 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

Definitions

• the present invention relates to an assembly for a photovoltaic module forming a chain of photovoltaic cells. It also concerns a photovoltaic module as well as the manufacture of photovoltaic assemblies.
• the photovoltaic modules comprise several photovoltaic cells interconnected between them to form an assembly also called photovoltaic chain.
• the interconnection of cells is a major issue because it defines the electrical energy production characteristics of the modules, particularly in terms of electrical power.
• a large photovoltaic cell can generate significant electrical resistances and it is preferable to use several cells having smaller dimensions in order to limit the electrical resistances to provide the electrical power. as important as possible.
• cells thus cut are interconnected by brazing using tin-based alloys as filler metal. Soldering consists of assembling two metal parts using a liquid filler metal at a melting temperature lower than that of the parts. In particular, the parts do not participate by fusion in the assembly. But such manufacture requires a large amount of tin, which makes the manufacturing process very expensive.
• EP 2 793 275 discloses an interconnection between two photovoltaic cells using an electrically conductive glue positioned along the conductive tracks of the cells.
• the conductive tracks also called “busbars” in English, are electrically conductive elements placed in contact with the cell substrate and connected to electrodes usually called “collection fingers” whose role is to collect the photo-generated charge carriers by the cell to produce an electric current.
• the conductive tracks extend along the cell.
• photovoltaic cells can comprise one to five conductive tracks.
• the interconnection of two cells consists of positioning a conductive wire along the conductive tracks of the cells then performing a solder between the electrically conductive glue and a coating previously placed on the conductive wires.
• the glue includes silver particles to be electrically compatible with the coating of the conductive wires.
• Swedish patent application SE 1930 374 discloses a process for interconnecting photovoltaic cells in which a first continuous strip carrying conductive wires positioned on the upper faces of the cells and a second continuous strip also carrying conductive wires positioned on the faces are used. lower cells.
• the electrical interconnection between the conductive wires is carried out in the inter-cell spaces where the conductive wires of the first band are brought into contact with the conductive wires of the second band.
• bringing the conductive wires into contact is delicate because they must be aligned with each other to be correctly connected.
• this method uses a large quantity of materials to produce the two continuous strips. In fact, the length of the strips used must be greater than the sum of the lengths of the photovoltaic cells.
• EP 3 165 361 discloses a method of interconnection between bifacial photovoltaic cells using an adhesive polymer sheet comprising conducting wires. This process is usually referred to by the trademark SmartWire Connection TechnologyTM (SWCT).
• SWCT SmartWire Connection TechnologyTM
• the polymer sheet is discontinuous, and comprises upper portions intended to be placed in contact with the upper faces of certain cells and lower portions intended to be placed in contact with the lower faces of other cells. Between two portions of sheets, the conducting wires are free.
• This method has the disadvantage of inducing a relatively high cost, particularly in terms of the materials used.
• An object of the present invention is therefore to propose a solution for interconnecting photovoltaic cells while limiting the drawbacks mentioned above.
• an assembly for a photovoltaic module comprising at least two photovoltaic cells and several interconnection elements for electrically connecting the two photovoltaic cells together, for each of the two photovoltaic cells each interconnection element extending along a main direction and covering the photovoltaic cell over an overlap length L3 measured along the main direction.
• the assembly also comprises several adhesive elements, each adhesive element having a width Y, measured in the main direction, such that Y ⁇ 0.5*L3.
• Each adhesive element is electrically conductive and each adhesive element is in contact with a single interconnecting element.
• each interconnecting element is in contact with only an adhesive element extending in said at least one half of the photovoltaic cell, so as to mechanically couple the element of interconnection with the photovoltaic cell.
• an assembly whose interconnection elements are held in position efficiently using a minimum amount of material.
• the set is simple to make and is particularly suitable for making a photovoltaic module that can include several sets.
• a photovoltaic module comprising at least one assembly as defined above.
• the assembly is encapsulated in a transparent material.
• a solar power plant comprising a plurality of photovoltaic modules as defined above.
• each interconnection element is intended to electrically connect the two photovoltaic cells together and extends, for each photovoltaic cell, along a main direction by covering the photovoltaic cell over an overlap length L3 measured along the main direction.
• each adhesive element has a width Y, measured along the main direction, such that Y ⁇ 0.5*L3.
• Each adhesive element is electrically conductive.
• Contacting includes:
• each interconnection element so as to bring them into contact, for at least one half of a photovoltaic cell, each interconnect element with only one adhesive element extending into said at least one half, so as to mechanically couple the interconnect element with the photovoltaic cell.
• a photovoltaic module comprising:
• FIG. 1 schematically represents an embodiment of an assembly for a photovoltaic module according to the invention
• Figure 2 schematically shows a sectional view of the assembly shown in Figure 1;
• Figures 3 to 8 schematically represent other embodiments of an assembly for a photovoltaic module.
• the width Y of the at least one adhesive element can be ⁇ 0.1*L3, preferably Y ⁇ 0.05*L3, preferably Y ⁇ 0.01*L3.
• the lap length is the length of the cell.
• each interconnection element can be maintained in two dots or a single dot. This helps maintain good alignment of the interconnecting elements.
• each interconnection element can be in contact with only two disjoint adhesive elements.
• two consecutive disjoint adhesive elements of the same photovoltaic cell in contact with the same interconnection element can be separated by a distance E5-6, such that E5-6 ⁇ 0.5*L3, E5-6 being measured parallel to the main direction.
• each interconnection element is secured to the cell by two points that are sufficiently distant to ensure that its position and its alignment are properly maintained over the entire cell.
• At least one adhesive element has the shape of a stud.
• At least one adhesive element has a shape having a width
• Y being measured along the main direction, preferably 0.9*Y ⁇ L ⁇ 1.1*Y.
• the assembly may comprise first adhesive elements extending in a first half of a photovoltaic cell and second adhesive elements extending in the second half of the photovoltaic cell.
• the adhesive elements extend in a first region comprised in the first half of the photovoltaic cell, the first region having a width, measured in the main direction, less than or equal to 0.1*L3, preferably less than or equal to 0.05*L3, preferably less than or equal to 0.01*L3.
• each photovoltaic cell can comprise a substrate and an electrically conductive structure in contact with a first part of a face of the substrate and each interconnection element, and in which the at least one adhesive element is in contact with a second part of the face of the substrate, the second part being devoid of an electrically conductive structure.
• the interconnection element is retained on the substrate only by the at least one adhesive element, at least before the soldering of the interconnection element to the electrical structure. So the element interconnection does not rest on a polymer sheet attached to the substrate.
• the process for manufacturing the assembly may comprise, simultaneously with, or after, the contacting of each interconnection element with at least one adhesive element, a step of polymerization of each adhesive element to couple mechanically each interconnection element with the photovoltaic cell.
• the method may comprise, preferably after the polymerization step, at least one lamination step carried out so as to produce an electrical connection between the interconnection elements and an electrically conductive structure of each photovoltaic cell.
• each photovoltaic cell can comprise a substrate and an electrically conductive structure in contact with the substrate, the electrically conductive structure comprising collection fingers configured to collect the charge carriers photo-generated by the substrate of the photovoltaic cell , the method comprising, preferably after the polymerization step, a lamination step so as to electrically connect each interconnection element with the electrically conductive structure of each photovoltaic cell, preferably during the lamination step, the method comprising supplying heat to the photovoltaic cells so as to solder each interconnection element to the electrically conductive structure of each photovoltaic cell.
• FIG. 1 there is shown an assembly 1 for photovoltaic module 30.
• Assembly 1 comprises at least two photovoltaic cells 2, 20 and at least one interconnection element 3.
• the photovoltaic cells 2, 20 are electrically interconnected between them via the interconnection elements 3, and the assembly 1 is also called “photovoltaic chain”.
• a photovoltaic module 30 comprises a set of photovoltaic cells 2, 20 interconnected to each other to produce a current.
• the photovoltaic cells 2, 20 are electrically connected together and encapsulated in a stack of materials of the polymer and/or glass type. The stack protects the cells 2, 20 while retaining the photoelectric conversion function of the cells 2, 20.
• the photovoltaic module 30 can be of the HET type, that is to say comprising heterojunction photovoltaic cells and especially based on silicon.
• a cell based silicon and heterojunction type is a cell comprising a crystalline silicon substrate and at least one hydrogenated amorphous silicon layer.
• a photovoltaic cell 2, 20 converts part of the light radiation into electrical energy.
• the photovoltaic cell 2, 20 comprises a substrate 10, a first electrically conductive structure 11 on a first face 12 of the substrate 10 and a second electrically conductive structure 14 on a second face 13 of the substrate 10, opposite to the first face. 12.
• Substrate 10 is capable of producing electrons when it receives light radiation.
• a substrate a film, a layer, “based” on a material, we mean a substrate, a film, a layer comprising this material only or this material and possibly other materials, for example doping elements.
• the substrate 10 comprises, for example, silicon.
• the first structure 11 forms a first group of electrodes of a first polarity
• the second structure 14 forms a second group of one or more electrodes of a second polarity.
• the first and second electrically conductive structures 11, 14 are intended to create an electric field for the movement of electrons within the substrate 10.
• the first electrically conductive structure 11 has the role of collecting the electrons photo-generated by the substrate 10
• the second electrically conductive structure 14 has the role of collecting the current produced by the movement of the electrons.
• the first electrically conductive structure 11 comprises a plurality of electrically conductive lines 15, usually made of metal. These lines are often referred to as collection fingers or metallization fingers. They are configured to collect the electrons produced by the substrate 10. In order to conduct a current between two interconnected cells, these conductive lines 15 are intended to be brought into contact with the interconnection elements 3 connecting two cells 2, 20.
• This connection conductive lines 15 with the interconnection elements 3 can be either direct or via conductive tracks 60 to 62, also called “BusBars” in English, which will be described later in more detail.
• the lines of metal forming the collection fingers 15 have a width of the order of 40 micrometers, the width being measured in a direction perpendicular to the length of the line.
• the second structure 14 can also comprise a plurality of collection fingers 16, in particular the same number of collection fingers as the first structure 12, and the photovoltaic cell is said to be bifacial. If the first and second faces 12, 13 of the substrate 10 are intended to receive light radiation to photo-generate an electric current on each of these faces, the cell is described as bifacial.
• the second structure 14 usually comprises a metal plate entirely covering the second face 13 of the substrate 10.
• the first face 12 is intended to receive the light radiation while the second face 13 is preferably intended to reflect the radiation by direction of the substrate 10.
• a photovoltaic cell 2, 20 has a main face, called the front face, corresponding to the first face 12 of the substrate 10, and an opposite secondary face, called the rear face, corresponding to the second face 13 of the substrate 10.
• the shape of the first and second faces 12, 13 can be varied: rectangular or square, with or without chamfer, circular etc.
• the photovoltaic cell 2, 20 has the general shape of a parallelepiped, that is to say it has six parallel faces two by two.
• the photovoltaic 2, 20 has a main edge 4 extending along a longitudinal direction A and a secondary edge 40 extending along a secondary direction B.
• the length of a cell 2, 20 is referenced by L2.
• the length of the main edge 4 corresponds to the length of the cell 2, 20.
• the main edge 4 extends longitudinally in the longitudinal direction A and the secondary edge 40 extends longitudinally in the secondary direction B.
• the collection fingers 15, 16 of the first and second electrically conductive structures 11, 14 extend along the secondary edge 40, that is to say they extend longitudinally along the secondary direction B.
• the collecting fingers 15, 16 are parallel to the secondary edge 40. More particularly, the collecting fingers 15, 16 are spaced apart from each other by a distance D.
• the collection fingers 15, 16 can be regularly spaced, ie the distances D between two collection fingers are identical.
• the interconnection elements 3 are intended to interconnect two photovoltaic cells 2, 20 with each other.
• the interconnection elements 3 have the role of transporting a current, in particular from the electrons produced by the substrate 10 of the photovoltaic cell 2, 20.
• An interconnection element 3 can be a wire or a ribbon.
• a wire has a generally cylindrical shape and has a length strictly greater than its width, on the contrary, a strip has a generally parallelepipedal shape and also has a length strictly greater than its width.
• the interconnection element 3 comprises copper.
• the interconnection elements 3 are positioned in contact with the cells 2, 20, in particular the interconnection elements 3 are positioned so that they extend along a main direction D3 and cover at least one photovoltaic cell 2, 20, preferably each photovoltaic cell 2, 20, over an overlap length L3 measured along the main direction D3.
• the main direction D3 can be oriented along the main edge 4 of the cell 2, 20.
• the main direction D3 can be parallel to the longitudinal direction A. If the interconnection element 3 completely covers the cell 2, 20, then the overlap length L3 corresponds to the dimension of the cell 2, 20 measured along the main direction D3. If cell 2, 20 has a square shape, and the main direction D3 runs parallel to one side of the square, then L3 is equal to the length of one side of the square.
• the interconnection elements 3 are positioned in contact with at least one of the first and second electrically conductive structures 11, 14 of each cell 2, 20.
• two cells 2, 20 in series by positioning the interconnection elements 3 in contact with the first electrically conductive structure of a first photovoltaic cell 2 of and in contact with the second electrically conductive structure 14 of a second photovoltaic cell 20.
• two cells 2, 20 can be interconnected in parallel by positioning the interconnection elements 3 in contact with the first electrically conductive structure of the first photovoltaic cell 2 and in contact with the first electrically conductive structure 11 of the second photovoltaic cell 20.
• the width of the interconnection elements 3 is greater than the width of the collection fingers 15, 16.
• the interconnection elements 3 extend along the main direction D3 and the width of the interconnection elements is measured perpendicular to this main direction D3.
• the collection fingers 15, 16 extend in an additional direction and the width of the interconnection elements is measured perpendicular to this additional direction.
• the main direction D3 and the additional direction are inclined with an angle ⁇ comprised between -25° and +25°, preferably between -5° and +5°.
• ⁇ 0°.
• the collection fingers 15, 16 extend parallel to the interconnection elements 3.
• conductive tracks 60 to 62 are preferably provided, also designated by the English term “busbar”, which extend in a direction substantially perpendicular to the collection fingers 15, 16 and to the interconnection elements 3.
• an assembly 1 comprising eight interconnection elements 3.
• the interconnection elements 3 are parallel to each other.
• the interconnection elements 3 are regularly spaced between them, that is to say they are separated by the same distance.
• the assembly 1 comprises at least one adhesive element 5, 6 in contact with the interconnection element(s) 3. More particularly, a adhesive element 5, 6 has a width Y, measured along the main direction D3, such that Y ⁇ 0.5*L3. In other words, the width Y of an adhesive element 5, 6 is less than half the lap length L3. For example, the width Y extends along the main edge 4 of the cell 2, 20.
• the width Y is less than half of the main edge 4 of the cell 2, 20, the length of the main edge 4 being measured along the main direction D3.
• a surface of adhesive material smaller than the surface of a photovoltaic cell 2, 20 is used.
• the quantity of adhesive material is therefore limited while allowing the interconnection elements 3 to be maintained.
• Y ⁇ 0.1*L3 preferably Y ⁇ 0.05*L3, preferably Y ⁇ 0.01*L3.
• These ratios make it possible to further limit the quantity of material used for the mechanical attachment of the interconnection elements 3. If the adhesive element 5, 6 is not transparent, the shading that it induces is then reduced. Furthermore, if the adhesive element 5, 6 is not electrically conductive and it is positioned on the electrical structure 11, then the fact that it occupies a restricted surface makes it possible to limit the non-conductive surface between this electrical structure 11 and the interconnection element 3.
• the adhesive element 5, 6 is composed of a polymer capable of hardening when it is subjected to heat or ultraviolet radiation.
• the polymer can be acrylate, epoxy or silicone based.
• the heat used to harden the adhesive element 5, 6 has a temperature less than or equal to 200°C, for example between 100°C and 200°C, preferably between 120°C and 140°C.
• the ultraviolet radiation to harden the adhesive element 5, 6 has a wavelength between 100 and 400 nm.
• the adhesive element 5, 6 hardens, it is also said to polymerize, it fixes the element interconnection element 3 to the photovoltaic cell 2, 20. In other words, the adhesive element 5, 6 mechanically couples the interconnection element 3 to the cell 2, 20.
• the adhesive element 5, 6 is transparent to visible light so as to limit a shading effect on the photovoltaic cell 2, 20 which could reduce its current production.
• visible light electromagnetic radiation whose wavelength is between 400 and 700 nm.
• transparent to visible light means an adhesive element 5, 6 which makes it possible to transmit at least 70% of a flux of visible light.
• the adhesive element 5, 6 can have an absorption coefficient strictly less than 100 rrr 1 over a wavelength range between 300 and 1200 nm.
• the width Y of an adhesive element 5, 6 is greater than or equal to that of an interconnection element 3.
• the width of an interconnection element 3 is between 200 and 300 micrometers , for example 250 micrometers. This makes it easier to position the interconnection element 3 on the adhesive element 5, 6.
• the width Y of an adhesive element 5, 6 is less than a quarter of the length of the main edge 4 of the photovoltaic cell 2, 20.
• the width Y of an adhesive element 5, 6 is less than 10 % of the length of the main edge 4.
• the width Y of an adhesive element 5, 6 is less than or equal to the distance D separating two collection fingers.
• the width Y of an adhesive element 5, 6 is less than or equal to twice the distance D separating two collection fingers.
• each photovoltaic cell comprises several separate adhesive elements 5, 6.
• Each adhesive element 5, 6 is in contact with only some of the interconnecting elements 3.
• an adhesive element 5, 6 is in contact with only one interconnection element 3.
• Adhesive elements 5, 6 have been shown having the general shape of a pad (also referred to as "pad" in English).
• the stud can for example have a circular shape or a polygonal shape.
• the stud may have a square or rectangular shape, for example a shape whose width Y is between 0.7* its length L and 1.3* its length L. Preferably 0.9*Y ⁇ L ⁇ 1.1 *Y.
• Y L.
• the length L of an adhesive element 5, 6 being measured in a direction perpendicular to the main direction D3.
• each adhesive element 5, 6 is in contact with several interconnection elements 3. Such is for example the case of the embodiments illustrated in FIG. 1, 2 and 5 to 9.
• the adhesive elements 5, 6 have the shape of a strip having a width Y extending along the main edge 4 of the photovoltaic cell 2, and a length L greater than its width Y.
• the strip shape makes it possible to maintain sufficient tension on the interconnection elements 3 in order to maintain a good alignment of the interconnection elements 3, that is to say to align the elements of interconnection 3 along the main direction D3, for example along the longitudinal direction A.
• the tension exerted on the interconnection elements 3 advantageously makes it possible to keep them in contact with the first and second electrically conductive structures 11, 14.
• the element adhesive 5, 6 is electrically insulating, that is to say not electrically conductive. In other words, the adhesive element 5, 6 can be devoid of metal particles.
• the adhesive element 5, 6 when the adhesive element 5, 6 has the shape of a pad, it is in contact with a single interconnection element 3. In this case, the adhesive element 5, 6 may or may not be electrically conductive. Alternatively, when the adhesive element 5, 6 has the shape of a strip to be in contact with at least two interconnection elements 3, it is electrically insulating so as not to create a short circuit between two interconnection elements 3 .
• the length L of an adhesive element 5, 6 extends along the secondary edge 40 of the cell 2, 20.
• the length L of an adhesive element 5, 6 extends perpendicular to the main direction D3.
• the secondary direction B can be perpendicular to the longitudinal direction A and the length L of an adhesive element 5, 6 extends perpendicular to the main edge 4 of the photovoltaic cell 2, 20.
• the length L of an adhesive element 5, 6 can extend perpendicularly to the interconnection elements 3.
• the length L of an adhesive element 5, 6 can also extend parallel to the secondary edge 40 of the photovoltaic cell 2, 20 .
• assembly 1 may comprise several interconnection elements 3.
• assembly 1 comprises one adhesive element 5 per interconnection element 3, that is to say that each adhesive element 5 is in contact with a single interconnection element 3.
• the assembly 1 comprises adhesive elements 5 respectively in contact with the interconnection elements 3.
• assembly 1 comprises several interconnection elements 3, first adhesive elements 5 respectively in contact with the interconnection elements 3 and second adhesive elements 6 respectively in contact with the interconnection elements 3.
• the assembly 1 comprises two adhesive elements 5, 6 per interconnection element 3. that is to say that two adhesive elements 5, 6 are in contact with the same interconnection element 3.
• the assembly 1 comprises several interconnection elements 3 and an adhesive element 5 in contact with several interconnection elements 3. More particularly, the adhesive element 5 has a shape of a strip to be in contact with at least two interconnection elements 3.
• the assembly 1 comprises eight interconnection elements 3 and four adhesive elements 5 in contact, each of two interconnecting elements 3.
• the assembly 1 comprises several interconnecting elements 3 and several adhesive elements 5, 6 in the form of a strip.
• First adhesive elements 5 are in contact with at least two interconnection elements 3 and second adhesive elements 6 are in contact with at least two interconnection elements 3.
• the assembly 1 comprises a single adhesive element 5 in contact with each of the interconnection elements 3.
• the adhesive element 5 has a length L extending along part of the secondary edge 40 of the photovoltaic cell 2.
• the adhesive element 5 may have a length L extending over the entire length of the secondary edge 40.
• the adhesive element 5 has the shape of a strip.
• the first electrically conductive structure 11 of a photovoltaic cell 2, 20 comprises at least one electrically conductive track 60 to 62, also called “Busbar” in English.
• the electrically conductive tracks 60 to 62 extend along the main edge 4 of the cell 2, 20.
• the electrically conductive tracks 60 to 62 have a greater width than those of the collection fingers 15, 16.
• assembly 1 comprises the same number of interconnection elements 3 as of electrically conductive tracks 60 to 62.
• each interconnection element 3 is positioned in contact with an electrically conductive line 60 to 62.
• FIGS 1 and 2 there is shown another embodiment, in which the assembly 1 comprises a first adhesive element 5 in contact with each of the interconnection elements 3 and a second adhesive element 6 in contact with each of the interconnection elements 3.
• the first adhesive element or elements 5 extend in a first half C1 of the photovoltaic cell 2. That is to say that each first adhesive element 5 is located opposite the first half C1 and that the width Y of each first adhesive element 5 is strictly less than half the length of the main edge 4 of the cell 2.
• the second adhesive element(s) 6 extend into the second half C2 of the photovoltaic cell 2. C that is to say that each second adhesive element 6 is located opposite the second half C2 and that the width Y of each second adhesive element 6 is strictly less than half the length of the main edge 4 of the cell 2.
• the photovoltaic cell 2 comprises a part 50 of the first face 12 of the substrate devoid of any electrically conductive structure.
• part 50 is located between secondary edge 40 and a first collection finger 15 of first conductive structure 11.
• first adhesive element(s) 5 are in contact with part 50 which has no electrically conductive structure.
• the use of an electrically insulating adhesive element 5, 6 therefore does not induce any negative impact in terms of electrical conductivity between the conductive structure 11 and the interconnection element 3.
• the interconnection elements 3 are electrically coupled to the first face 12 of the substrate 10 of the first photovoltaic cell 2 of the assembly 1 and to the second face 13 of the substrate 10 of the second photovoltaic cell 20, and the cells 2, 20 of the assembly 1 are interconnected in series.
• the second photovoltaic cell 20 is similar to the first photovoltaic cell 2. That is to say that the photovoltaic cells 2, 20 have, in particular, the same dimensions and the same electrically conductive structures 11, 14.
• the interconnection elements 3 are electrically coupled to the first face 12 of the substrate 10 of the first photovoltaic cell 2 and to the first face 12 of the substrate 10 of the second photovoltaic cell 20, and the cells 2, 20 of the assembly 1 are interconnected in parallel.
• first adhesive elements 5 can be positioned on the first photovoltaic cell 2 and one or more first adhesive elements 5 on the second photovoltaic cell 20 to effectively maintain the elements of interconnection 3 on the respective faces 12, 13 of the cells 2, 20. It is also possible to position first and second adhesive elements 5, 6 on one face 12, 13 of the first photovoltaic cell 2 and first and second adhesive elements 5, 6 on one face 12, 13 of the second photovoltaic cell 20 in order to improve the holding in position of the elements of interconnection 3.
• the deposition step comprises bringing at least one adhesive element 5, 6 into contact with at least one interconnection element 3 so that the conductive element(s) 3, intended to electrically connect the two photovoltaic cells 2, 20 between them, extend over a photovoltaic cell 2, 20 along a main direction D3 covering the cell 2, 20 over an overlapping length L3 measured along the main direction D3, and so that the adhesive element(s) 5, 6 have a width Y, measured along the main direction D3, such that Y ⁇ 0.5*L3.
• the interconnection elements 3 when the interconnection elements 3 are brought into contact with the adhesive elements 5, 6, the interconnection element(s) 3 are placed on the photovoltaic cell, in particular on the first face 12 of the substrate 10 of the photovoltaic cell 2, then the adhesive element(s) 5, 6 are placed in contact with the interconnection elements 3.
• the adhesive elements 5, 6 when brought into contact, are placed on the photovoltaic cell 2, in particular on the first face 12 of the substrate 10 of the photovoltaic cell 2, then the interconnection elements 3 are placed in contact with the adhesive elements 5, 6.
• the adhesive element 5, 6 is deposited on the first face 12 of the cell 2, 20, more particularly on the main face 12 of the substrate and/or on the secondary face 12 of the substrate 10 by screen printing, dispense, c ie a laying of the adhesive element 5, 6 with a longitudinal spreading, or by jet.
• the longitudinal spreading can be carried out along the longitudinal A or secondary direction B.
• 6 has a viscosity, before its polymerization, of between 10 Pa.s and 40 Pa.s.
• the adhesive element 5, 6 has a Young's modulus, after its polymerization, of between 0.1 and 5 GPa at 25°C.
• a polymerization step is carried out to harden the adhesive element 5, 6 and mechanically couple the interconnection element 3 with the cells.
• - heat preferably at a temperature between 100 and 200°C, and even more preferably at a temperature between 120 and 140°C.
• the bringing into contact and the polymerization make it possible to position the interconnection elements 3 in contact with the first electrically conductive structure 11 of the first cell 2 and with the first or second electrically conductive structure 14 of the second photovoltaic cell 20.
• the interconnection element 3 is retained on the substrate 10 only by the at least one adhesive element 5, 6 (at least before the soldering step which will be described below).
• the interconnection element 3 is preferably not held to the substrate by a polymer sheet attached to the substrate 10.
• the interconnection elements 3 include a coating suitable for a soldering step making it possible to electrically couple the interconnection elements 3 with the first and second electrically conductive structures 11, 14 of the photovoltaic cells 2, 20.
• the soldering step consists in heating the assembly 1 to assemble the interconnection elements 3 to the electrically conductive structures 11, 14 by heating the coating to its melting temperature.
• the melting temperature of the coating is lower than that of copper.
• the first and second electrically conductive structures 11, 14 are made from a paste comprising silver
• the coating of the interconnection elements 3 is made from an alloy of bismuth or indium.
• the coating is made from an alloy of tin, bismuth and silver.
• the method preferably comprises, after the polymerization step, a lamination step.
• a lamination step Preferably the heat necessary for the solder is provided during the lamination step.
• the electrical connection is made between the interconnection elements 3 and the electrically conductive structure including collection fingers.
• this lamination step also corresponds to the lamination state during which the various layers of the photovoltaic module are laminated, these various layers comprising the substrate 10 coated with the electrical structures 11, 14, as well as the encapsulation layers of the substrate.
• the process for producing the photovoltaic module does not include an additional lamination step.
• the proposed method therefore has a reduced number of steps while offering high reliability in positioning and maintaining the interconnection elements.
• the method comprises, after the polymerization step, a step of soldering the interconnection elements 3 with one of the electrically conductive structures 11, 14 of each photovoltaic cell 2, 20 of the assembly 1 .

Landscapes

• Photovoltaic Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=80448451

Family Applications (1)

Country Status (3)

Family Cites Families (5)

• 2021
  • 2021-10-15 FR FR2110959A patent/FR3128314A1/fr active Pending
• 2022
  • 2022-10-14 WO PCT/EP2022/078705 patent/WO2023062213A1/fr not_active Ceased
  • 2022-10-14 EP EP22802110.1A patent/EP4416764A1/de active Pending

Also Published As

Similar Documents

Legal Events