WO2022144398A1 - Élément photovoltaïque avec au moins une cellule photovoltaïque et au moins une barre omnibus repliée - Google Patents

Élément photovoltaïque avec au moins une cellule photovoltaïque et au moins une barre omnibus repliée Download PDF

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Publication number
WO2022144398A1
WO2022144398A1 PCT/EP2021/087799 EP2021087799W WO2022144398A1 WO 2022144398 A1 WO2022144398 A1 WO 2022144398A1 EP 2021087799 W EP2021087799 W EP 2021087799W WO 2022144398 A1 WO2022144398 A1 WO 2022144398A1
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WO
WIPO (PCT)
Prior art keywords
photovoltaic
folded
busbar
electrode
layer system
Prior art date
Application number
PCT/EP2021/087799
Other languages
German (de)
English (en)
Inventor
Michael Meissner
Susanne Müller
Assaad ZAWIT
Original Assignee
Heliatek Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heliatek Gmbh filed Critical Heliatek Gmbh
Priority to EP21847517.6A priority Critical patent/EP4272258A1/fr
Publication of WO2022144398A1 publication Critical patent/WO2022144398A1/fr

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Classifications

    • 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
    • H01L31/02—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

Definitions

  • Photovoltaic element having at least one photovoltaic cell and at least one folded busbar
  • the invention relates to a photovoltaic element with at least one photovoltaic cell and at least one folded busbar which is electrically conductively contacted at the front electrode and/or the rear electrode, the at least one folded busbar being designed as a U-shaped profile.
  • Optoelectronics consists of the fields of optics and semiconductor electronics. In particular, it includes systems and processes that enable the conversion of electronically generated energies into light emissions or convert light emissions into energy.
  • Optoelectronic components in particular organic photovoltaic elements (OPVs) and organic light-emitting diodes (organic light-emitting diodes, OLED), generate electrical energy or convert electrical energy into light emissions, which must be led out of or into the photovoltaic element for use in the further course.
  • OLED organic light-emitting diodes
  • busbars also known as busbars, are used, which have to meet the requirements of a flexible photovoltaic element.
  • Busbars represent a point in an optoelectronic component at which the converted energy is bundled and forwarded in the form of electrical currents.
  • busbars are known which are attached to the front or to the rear of the photovoltaic elements.
  • the dimensions of the cross-section of a busbar depend on the amperage to be transmitted.
  • the busbars must be particularly flat.
  • Photovoltaic elements are usually provided with a barrier layer or encapsulated to protect against external influences, in particular to protect them mechanically and against environmental influences, for example moisture or oxygen.
  • the busbars are located under the barrier layer. In order to lead out electrical energy generated by photovoltaic elements through the barrier layer, the busbars located within the barrier layer must be electrically conductively contacted through the barrier layer.
  • the current dissipation of photovoltaic elements can be done by means of two busbars that are attached to the edge of a back electrode.
  • the electrical current is led out of the photovoltaic element by means of an electrically conductive contact, and is passed on to a junction box.
  • the electrically conductive contact leads from the busbars to the junction box through openings in a protective layer of the photovoltaic element.
  • the openings in the protective layer are susceptible to moisture and atmospheric oxygen penetrating the photovoltaic element, in particular to the busbars, the electrodes and the layer system, and thereby lead to degradation and a reduction in the service life of the photovoltaic element.
  • a disadvantage of the prior art is that local contacting of the busbars shortens the service life of the contacting, and mechanical stress or temperature fluctuations more easily leads to breakage of the contacting. Furthermore, the busbars are arranged horizontally on the layer system, with no protection of the layer system on the sides, i.e. vertically on the layer system, from external Influences, in particular moisture and / or oxygen, is guaranteed.
  • the invention is therefore based on the object of providing a photovoltaic element with at least one photovoltaic cell and with at least one busbar, the disadvantages mentioned not occurring, and in particular providing electrically conductive contacting with improved protection of the layer system of the photovoltaic element from external influences becomes .
  • a photovoltaic element with at least one photovoltaic cell with a layer system with a front electrode, a rear electrode and at least one photoactive layer, the at least one photoactive layer being arranged between the front electrode and the rear electrode, and at least one folded busbar , which is electrically conductively contacted at the front electrode and/or the rear electrode.
  • the at least one folded busbar is designed as a U-shaped profile, with edges of one side of the at least one photovoltaic cell being arranged on an inside of the U-shaped profile of the at least one folded busbar, so that the U-shaped profile covers the edges of one side which encloses at least one photovoltaic cell.
  • the at least one busbar can therefore preferably be connected to the layer system or a barrier layer arranged thereon can be arranged such that one side of the at least one photovoltaic cell in the vertical extension of the layer system and the edges of the side are enclosed by the folded busbar.
  • the inner area of the U-shaped profile is arranged in the entire longitudinal direction of one side of the vertical extension of the layer system.
  • the photovoltaic element can have a CIS, CIGS, GaAs or Si cell, a Perovs kit cell or organic cells, ie an organic photovoltaic element (OPV), a so-called organic solar cell.
  • An organic photovoltaic element is understood to mean in particular a photovoltaic element with at least one organic photoactive layer, in particular a polymeric organic photovoltaic element or an organic photovoltaic element based on small molecules. While polymers are characterized by the fact that they cannot be vaporized and can therefore only be applied from solutions, small molecules are usually vaporizable and can either be applied as a solution like polymers, but also by means of evaporation technology, in particular by evaporation from a vacuum. More preferably, the photovoltaic element is a flexible organic small molecule photovoltaic element.
  • the photoactive layer of the layer system comprises small molecules which can be evaporated in a vacuum. In a preferred embodiment, at least the photoactive layer of the layer system is vapor-deposited in a vacuum.
  • Small molecules are understood to mean, in particular, non-polymeric organic molecules with monodisperse molar masses between 100 and 2000 g/mol, which are present in the solid phase under normal pressure (air pressure of the atmosphere surrounding us) and at room temperature.
  • the small molecules are photoactive, photoactive meaning that the molecules change their charge state and/or their polarization state when exposed to light.
  • the at least one photovoltaic cell is a single, tandem or multiple cell. Tandem and multiple cells consist of at least two cells which are arranged one above the other between the electrodes, with each cell having at least one photoactive layer.
  • the photovoltaic element is preferably made up of several photovoltaic cells.
  • the plurality of photovoltaic cells can be arranged and/or interconnected in different ways in the photovoltaic element; in particular, the photovoltaic cells are interconnected in series and/or in parallel.
  • a front side of a photovoltaic element correspondingly also a front protective layer, a front barrier layer, a front electrode and a front leg, is understood to mean a side of the photovoltaic element intended to face sunlight.
  • a rear side of a photovoltaic element correspondingly also a rear protective layer, a rear barrier layer, a rear electrode and a rear leg, is understood to mean a side of the photovoltaic element that is intended to face away from sunlight.
  • the photovoltaic element is a flexible photovoltaic element.
  • a flexible photovoltaic element is understood to mean, in particular, a photovoltaic element that can be bent and/or stretched in a specific area.
  • the photovoltaic element is provided with a protective layer and/or encapsulated with a protective layer in order to minimize degradation due to external influences, in particular moisture and atmospheric oxygen.
  • a protective layer there is in particular a layer to prevent the permeability of external influences, in particular atmospheric oxygen and/or moisture, and/or a layer to increase the mechanical resistance, in particular scratch resistance, and/or a filter layer, preferably a layer with a UV Filters, got it.
  • a side of the at least one photovoltaic cell that is not protected by a folded busbar is protected by a barrier layer, preferably an overlapping barrier layer with a specific diffusion length.
  • the U-shaped profile of the at least one folded busbar is formed from a side element with a front leg arranged horizontally to the layer system on one side of the side element and a rear leg arranged horizontally to the layer system on an opposite side of the side element is, the two legs running at a distance from one another horizontally in the same direction, with a connection area of the front leg and/or the rear leg preferably being angled or curved relative to the side element, and/or the side element being vertical to the layer system, i.e in the vertical extension of the layer system, planar or curved.
  • a busbar a so-called busbar, is understood in particular to mean an arrangement which is electrically conductively connected for electrical contacting as a central distributor of electrical energy to incoming and outgoing lines, preferably with at least one electrode and/or at least one counter-electrode.
  • the busbar is designed in particular as a planar strip, strip, plate or as a metal layer.
  • the folded busbar has a layer thickness of 10 ⁇ m to 500 ⁇ m to , preferably from 100 ⁇ m to 500 ⁇ m, preferably from 10 ⁇ m to 200 ⁇ m, preferably from 10 ⁇ m to 100 ⁇ m, preferably from 10 ⁇ m to 50 ⁇ m, or preferably from 20 ⁇ m to 40 ⁇ m.
  • the layer system is laser-structured so that the rear electrode and/or the front electrode can be electrically conductively contacted with the first busbar and the second busbar from a side of the photovoltaic element intended to be remote from the sun.
  • This enables in particular the electrically conductive contacting of different potentials on one level of the photovoltaic element, in particular on a level horizontal to the extension of the layer system via the first busbar and the second busbar.
  • two potentials can be tapped off in particular in one plane, in particular a potential of the front electrode and a potential of the rear electrode.
  • Different potentials of the at least one photovoltaic cell are preferably separated from one another during the laser structuring.
  • either the front leg or the back leg of the first folded busbar grabs the potential of the front electrode, preferably the front electrode, and/or the potential of the back electrode, preferably the back electrode, and the front leg or the back leg of the second folded busbar from the potential of the other electrode electrically conductive.
  • the photovoltaic element according to the invention with at least one photovoltaic cell and at least one folded busbar has advantages compared to the prior art.
  • a barrier against atmospheric oxygen and moisture is advantageously formed on one side of the photovoltaic element with a folded busbar, in particular in the vertical extension of the layer system.
  • Advantageously will improves the diffusion tightness on the sides vertical to the layer system.
  • less photoactive area of the photovoltaic element is covered, with improved efficiency of the photovoltaic element being obtained.
  • the photovoltaic elements advantageously have a constant current-carrying capacity.
  • the stability of the busbar is advantageously increased, with the waviness of the busbar being reduced in particular.
  • the proportion of the inactive photoactive surface is reduced and the efficiency of the photovoltaic element is thus increased.
  • on one side with a folded busbar there is no need for barriers projecting beyond the at least one photovoltaic cell, ie wide lateral diffusion zones, since edges of the photovoltaic element are surrounded by the folded busbar.
  • lateral diffusion areas of the photovoltaic element are protected by means of the folded busbar.
  • the barrier layer in particular the front barrier layer and/or the rear barrier layer, has a layer thickness of from 10 ⁇ m to 400 ⁇ m, preferably from 100 ⁇ m to 400 ⁇ m, preferably from 10 ⁇ m to 100 ⁇ m, preferably from 10 ⁇ m to 50 pm, or preferably from 20 pm to 40 pm.
  • the photovoltaic element has at least one barrier layer, preferably a front barrier layer on a front side of the photovoltaic element and a rear barrier layer on a rear side of the photovoltaic element, preferably an encapsulation, the rear barrier layer on the intended side facing away from the sun photovoltaic element and the front barrier layer arranged on the intended sun-facing side of the photovoltaic element wherein the barrier layer is a UV barrier layer, an anti-reflection layer, a layer against moisture and/or oxygen, and/or a mechanical barrier layer, wherein preferably the at least one folded busbar is arranged under the at least one barrier layer.
  • the barrier layer is a UV barrier layer, an anti-reflection layer, a layer against moisture and/or oxygen, and/or a mechanical barrier layer, wherein preferably the at least one folded busbar is arranged under the at least one barrier layer.
  • a barrier layer is in particular a layer to prevent the permeability of external influences, in particular atmospheric oxygen and/or moisture, a barrier layer to increase the mechanical resistance, in particular scratch resistance, an anti-reflection layer, and/or a filter layer, preferably a layer with a UV filter, understood.
  • the at least one barrier layer is formed from a film, in particular a light-transmitting film.
  • the at least one barrier layer is made of ethylene tetrafluoroethylene (ETFE), ethylene vinyl acetate (EVA), polyacrylate (PA), polycarbonate (PC), polyethylene (PE), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), Polypropylene (PP), or thermoplastic polyurethane (TPU) formed.
  • ETFE ethylene tetrafluoroethylene
  • EVA ethylene vinyl acetate
  • PA polyacrylate
  • PC polycarbonate
  • PE polyethylene
  • PEN polyethylene naphthalate
  • PET polyethylene terephthalate
  • PMMA polymethyl methacrylate
  • PP Polypropylene
  • TPU thermoplastic polyurethane
  • the photovoltaic element has at least one barrier layer on the front side and at least one barrier layer. In a preferred embodiment, at least one of the at least one barrier layer on the front side is bonded to one of the at least one barrier layer on the back side.
  • a front side of a photovoltaic element is understood to mean in particular a side of the photovoltaic element that is intended to face the sun. Accordingly, a rear side of a photovoltaic element is understood to mean, in particular, a side of the photovoltaic element that is intended to face away from the sun.
  • a longitudinal direction is understood to mean, in particular, an extension of the photovoltaic element in its longest extension horizontal to the extension of the layer system.
  • a transverse direction is understood to mean, in particular, an expansion of the photovoltaic element transverse to the longitudinal direction, horizontal to the expansion of the layer system.
  • a horizontal extension to the layer system is understood to mean in particular an extension in a plane or parallel to a plane, in particular a layer, of the layer system.
  • the horizontal extension of the layer system preferably runs in the longitudinal direction and/or in the transverse direction of the layer system.
  • the layers of the layer system are preferably arranged parallel to one another horizontally to the extent of the layer system.
  • a vertical extension to the layer system is understood in connection with the present invention to mean in particular an extension at the level of the layer system, ie an extension along the layers of the layer system arranged one above the other.
  • the at least one photovoltaic cell is laser-structured, so that the front electrode and/or the rear electrode can be electrically conductively contacted from one side of the photovoltaic element by means of the front leg or the rear leg of the at least one folded busbar. preferably from the side of the photovoltaic element that is intended to be remote from the sun.
  • the front electrode is preferably connected to the back electrode in such a way that the potential of the front electrode can be tapped off at the back electrode.
  • several photovoltaic cells are arranged next to one another and connected in series by means of laser structuring. Each photovoltaic cell preferably has a back electrode and a front electrode. The serial connection is preferably carried out by electrically connecting the front electrode of one photovoltaic cell to the rear electrode of the next photovoltaic cell.
  • the layer system is arranged vertically on the side element, and the front leg relative to the layer system is arranged horizontally to the front electrode and the rear leg is arranged horizontally to the back electrode of the layer system, and/or the folded busbar over the entire extension is in the longitudinal direction of one side of the at least one photovoltaic cell, and/or the at least one folded busbar is arranged on a photovoltaic cell or on photovoltaic cells connected in parallel to one another.
  • At least one barrier layer is arranged between the at least one folded busbar and the front electrode and/or between the at least one folded busbar and the rear electrode, the at least one folded busbar being connected to the front electrode and/or is in electrically conductive contact with the rear electrode by means of a second electrically conductive contact element, and/or between the front leg and the front electrode and/or the rear leg and the rear electrode, at least in one area, an electrically conductive connecting material, preferably an adhesive layer, is arranged.
  • An electrically conductive contact element is, in particular, a cohesive, electrically conductive contact between the folded busbar and the rear electrode and / or understood the front electrode.
  • the electrical contact element is a round contact surface to the front electrode and/or the rear electrode, preferably with a diameter of 4 mm to 14 mm, preferably 4 mm to 10 mm, or preferably 6 mm to 10 mm , or is designed as an elongate contact surface, in particular a slot, the elongate contact surface being formed at least largely over the extent of the folded busbar in the longitudinal direction.
  • the rear leg of the at least one folded busbar is formed at least largely over the entire rear side of the photovoltaic element.
  • the photovoltaic element has two folded busbars, with a first folded busbar making electrically conductive contact with the front electrode and a second folded busbar making electrically conductive contact with the rear electrode, with the folded busbars making electrically conductive contact with two different potentials, in particular tap, preferably both on the front or both on the back of the at least one photovoltaic cell, and / or the first folded busbar and the second folded busbar are arranged on opposite sides in the longitudinal direction of the at least one photovoltaic cell.
  • the first folded busbar is arranged on the rear electrode and/or the second folded busbar on the front electrode, the first folded busbar being assigned a first potential and the second folded busbar being assigned a second potential.
  • the folded busbar has a layer thickness of 20 ⁇ m to 100 ⁇ m, preferably 20 ⁇ m to 50 ⁇ m, and/or the front leg has a width horizontal to the layer system of 2 to 20 mm, preferably 2 to 10 mm, and the rear leg has a Width horizontal to the layer system of preferably 2 to 20 mm, or preferably at least 10 mm.
  • the photovoltaic element has at least one protective layer, preferably a front protective layer on a front side of the photovoltaic element and a rear protective layer on a rear side of the photovoltaic element, preferably an encapsulation.
  • the protective layer is opened at certain points. In this case, short circuits between electrically conductive connection points must be prevented and an adequate barrier function at the contact holes must also be ensured.
  • the at least one protective layer is formed from a film, in particular a light-transmitting film.
  • the at least one protective layer is made of ethylene tetrafluoroethylene (ETFE), ethylene vinyl acetate (EVA), polyacrylate (PA), polycarbonate (PC), polyethylene (PE), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), Polypropylene (PP) or thermoplastic polyurethane (TPU).
  • ETFE ethylene tetrafluoroethylene
  • EVA ethylene vinyl acetate
  • PA polyacrylate
  • PC polycarbonate
  • PE polyethylene
  • PEN polyethylene naphthalate
  • PET polyethylene terephthalate
  • PMMA polymethyl methacrylate
  • PP polypropylene
  • TPU thermoplastic polyurethane
  • the at least one folded busbar is designed in one piece or in two parts, with the side element being divided vertically to the layer system into a front element and a rear element, with the front element and the rear element being electrically conductive are connected to one another, an electrically conductive connecting material preferably being arranged between the front element and the rear element.
  • the at least one folded busbar is electrically insulated on the surface facing away from the layer system, and/or the at least one folded busbar has a passivation, preferably made of a metal oxide, on the surface facing away from the layer system.
  • a surface facing away from the layer system is understood as meaning a surface lying on the outside.
  • the first folded busbar and/or the second folded busbar are electrically conductively connected or can be connected to a junction box for connecting the photovoltaic element.
  • a junction box is understood to mean, in particular, an element for connecting the photovoltaic element to an electrical circuit.
  • the junction box is used in particular for electrically conductive contacting of a rear electrode and/or a front electrode, or a first busbar and/or a second busbar to an electrical circuit.
  • the junction box is arranged on the intended sun-facing side of the photovoltaic element.
  • the junction box is arranged on the side of the photovoltaic element that is intended to be remote from the sun.
  • the at least one folded busbar is formed as a metal layer made of at least one metal or an alloy thereof, preferably copper and tin.
  • the photovoltaic element consists of at least two photovoltaic elements Cells are formed, preferably from a large number of photovoltaic cells, the at least two photovoltaic cells being connected to one another in series and/or in parallel.
  • Fig. 1 shows a schematic representation of an exemplary embodiment of a plurality of photovoltaic cells of a photovoltaic element with a laser-structured layer system
  • Fig. 2 shows a schematic representation of an exemplary embodiment of a photovoltaic element with a folded busbar in a side view
  • Fig. 3 shows a schematic representation of an embodiment of a photovoltaic element with a folded busbar and a protective layer in a side view
  • Fig. 4 shows a schematic representation of an embodiment of a photovoltaic element with a folded busbar and a protective layer in a side view
  • Fig. 5 shows a schematic representation of an embodiment of a photovoltaic element with two folded busbars in a side view.
  • Fig. 1 shows a schematic representation of an exemplary embodiment of a plurality of photovoltaic cells 3 of a photovoltaic element 1 with a laser-structured layer system 11 .
  • Fig. 1 shows several photovoltaic cells 3 with a laser-structured layer system 9, the photovoltaic cells 3 being connected to one another in series.
  • the layer system 11 is arranged on a substrate (not shown), with several photovoltaic cells 3 being arranged next to one another.
  • the layer system 11 each comprises a front electrode 5, a back electrode 7 and a layer system 9 with at least one photoactive layer.
  • the layer system 9 can have, for example, two semiconducting and/or organic transport layers and between them a semiconducting and/or organic absorber layer.
  • the layer system 9 is set up in such a way that it generates an output voltage between the electrodes 5 , 7 when irradiated with optical radiation.
  • the structuring of the layer system 11 each has a PI type, a P2 type and a P3 type.
  • the rear electrode 7 and the front electrode 5 are connected to one another in an ohmic manner, and a number of photovoltaic cells 3 are also connected to one another in series.
  • the arrows indicate the current flow.
  • FIG. 2 shows a schematic representation of an exemplary embodiment of a photovoltaic element 1 with a folded busbar 13 in a side view. Elements that are the same and have the same function are provided with the same reference symbols, so that reference is made to the previous description.
  • the photovoltaic element 1 has at least one photovoltaic cell 3 with a layer system 11 with a front electrode 5 , a rear electrode 7 and at least one photoactive layer 9 , wherein the at least one photoactive layer 9 is arranged between the front electrode 5 and the rear electrode 7 , and at least one folded busbar 13, which is electrically conductively contacted at the front electrode 5 and/or the rear electrode 7.
  • the at least one folded busbar 13 is designed as a U-shaped profile, with edges 15 on one side of the at least one photovoltaic cell 3 being arranged on an inside of the U-shaped profile of the at least one folded busbar 13, so that the U-shaped profile Edges 15 of one side of the at least one photovoltaic cell 3 encloses.
  • a barrier against atmospheric oxygen and moisture is formed on one side with a folded busbar 13 of the photovoltaic element 1 , in particular in the vertical extension of the layer system 11 .
  • the diffusion tightness on the sides vertical to the layer system 11 is advantageously improved.
  • the stability of the busbar 13 is increased, with a waviness of the busbar 13 being reduced in particular.
  • the U-shaped profile of the at least one folded busbar 13 consists of a side element 17 with a front leg 19 arranged horizontally to the layer system 11 on one side of the side element 17 and a front leg 19 that is horizontal to the layer system 11 on an opposite side of the side element 17 arranged rear leg 21, the two legs 19, 21 running horizontally at a distance from one another in the same direction, with a connection area of the front leg 19 and/or the rear leg 21 preferably being angled or curved relative to the side element 17, and/or the side element 17 is designed to be planar or curved vertically to the layer system 11 .
  • the at least one photovoltaic cell 3 is laser-structured, so that the front electrode 5 and/or the rear electrode 7 can be electrically connected from one side of the photovoltaic element 1 by means of the front leg 19 or the rear leg 21 of the at least one folded busbar 13 can be contacted in a conductive manner, preferably from the side of the photovoltaic element 1 which is intended to be remote from the sun.
  • the electrically conductive contacting of different potentials on a plane of the photovoltaic element 1 in particular a plane horizontal to the extent of the layer system 9 , is possible.
  • this is Layer system 11 is arranged vertically on the side element 17, and the front leg 19 relative to the layer system 11 is arranged horizontally to the front electrode 5 and the rear leg 21 is arranged horizontally to the back electrode 7 of the layer system 11, and/or the busbar 13 is folded over the entire Extension in the longitudinal direction of one side of the at least one photovoltaic cell, and/or the at least one folded busbar 13 is arranged on a photovoltaic cell 3 or on photovoltaic cells 3 connected in parallel to one another.
  • At least one barrier layer 23/25 is arranged between the at least one folded busbar 13 and the front electrode 5 and/or between the at least one folded busbar 13 and the rear electrode 7, with the at least one folded busbar 13 being protected by a first electrically conductive contact element 27 with the front electrode 5 and/or by means of a second electrically conductive contact element 27 with the rear electrode 7, and/or between the front leg 19 and the front electrode 5 and/or the rear leg 21 and the rear electrode 7
  • An electrically conductive connecting material 29 preferably an adhesive layer, is arranged at least in one area.
  • the folded busbar 13 has a layer thickness of 20 ⁇ m to 100 ⁇ m, preferably 20 ⁇ m to 50 ⁇ m, and/or the front leg 19 has a width horizontally to the layer system 11 of 2 to 20 mm. preferably from 2 to 10 mm, and the rear leg 21 has a width horizontal to the layer system, preferably from 2 to 20 mm, or preferably at least 10 mm.
  • the at least one folded busbar 13 is attached to the layer system 11 electrically insulated from the surface facing away, and/or the at least one folded busbar 13 has a passivation on the surface facing away from the layer system 11, preferably made of a metal oxide.
  • first folded busbar 13 and/or the second folded busbar 13 are electrically conductively connected or can be connected to a junction box for connecting the photovoltaic element 1 .
  • FIG. 2 shows a photovoltaic element 1 with a folded busbar 12 in one embodiment.
  • An electrically conductive contact element 27 for electrically conductive contacting of the folded busbar 13 with the rear electrode 7 is formed on the folded busbar 13 .
  • the layer system 11 with the front electrode 5, the back electrode 7, and the photoactive layer 9 are laser-structured.
  • the rear electrode 7 and/or the front electrode 5 make electrically conductive contact with the folded busbar 13 from a side of the photovoltaic element 1 that is intended to be remote from the sun.
  • the electrically conductive contact element 27 runs through the barrier layer 25 and has a contact surface to the back electrode 7 at the end remote from the busbar 13 , the diameter of the contact surface being 10 mm, for example.
  • the folded busbar can be used for production on one side of the layer system 11 or are applied to a barrier layer 23, 25 arranged there, preferably fastened with a connecting material 29, and from this side to the opposite side of the layer system or the opposite barrier layer 23, 25 are bent, preferably fixed there with a connecting material 29 (see FIGS. 3 and 4), the connecting material 29 being electrically conductive in the area of the electrically conductive contact element 27 is .
  • Fig. 3 shows a schematic representation of an embodiment of a photovoltaic element 1 with a folded busbar 13 and a protective layer 31 in a side view. Elements that are the same and have the same function are provided with the same reference symbols, so that reference is made to the previous description.
  • the layer system 11 with the front electrode 5, the back electrode 7, and the photoactive layer 9 are laser-structured.
  • the rear electrode 7 and/or the front electrode 5 make electrically conductive contact with the folded busbar 13 from a side of the photovoltaic element 1 that is intended to be remote from the sun.
  • the electrically conductive contact element 27 runs through the barrier layer 25 and has a contact surface to the back electrode 7 at the end remote from the busbar 13 , the diameter of the contact surface being 10 mm.
  • the photovoltaic element 1 has a protective layer 31 , an adhesive layer 33 preferably being arranged between the protective layer 31 and the layer system 11 .
  • the photovoltaic element 1 is formed from a plurality of photovoltaic cells 3 which are connected to one another in series and/or in parallel by means of laser structuring.
  • the photovoltaic element 1 is a flexible photovoltaic element 1 .
  • the photovoltaic element 1 has at least one protective layer 31, preferably a front protective layer 31 on a front side of the photovoltaic element 1 and a rear protective layer 31 on a rear side of the photovoltaic element 1, preferably an encapsulation.
  • Fig. 4 shows a schematic representation of a Embodiment of a photovoltaic element 1 with a folded busbar 13 and a protective layer 31 in a side view. Elements that are the same and have the same function are provided with the same reference symbols, so that reference is made to the previous description.
  • the layer system 11 with the front electrode 5, the back electrode 7, and the photoactive layer 9 are laser-structured.
  • the rear electrode 7 and/or the front electrode 5 make electrically conductive contact with the folded busbar 13 from a side of the photovoltaic element 1 that is intended to be remote from the sun.
  • the electrically conductive contact element 27 runs through the barrier layer 25 and has a contact surface to the back electrode 7 at the end remote from the busbar 13 , the diameter of the contact surface being 10 mm in this exemplary embodiment.
  • the photovoltaic element 1 is formed from a plurality of photovoltaic cells 3 which are connected to one another in series and/or in parallel by means of laser structuring.
  • the at least one folded busbar 13 can be designed in one piece or, as in this exemplary embodiment, in two parts, with the side element 17 being divided vertically to the layer system 11 into a front element 35 and a rear element 37, with the front element 35 and the rear element 37 are connected to one another in an electrically conductive manner, with an electrically conductive connecting material 39 preferably being arranged between the front element 35 and the rear element 37 .
  • FIG. 5 shows a schematic representation of an exemplary embodiment of a photovoltaic element 1 with a folded busbar 13 in a side view. Elements that are the same and have the same function are provided with the same reference symbols, so that the previous description applies in this respect is referenced.
  • the layer system 11 with the front electrode 5, the back electrode 7, and the photoactive layer 9 are laser-structured.
  • the rear electrode 7 and/or the front electrode 5 make electrically conductive contact with the folded busbar 13 from a side of the photovoltaic element 1 that is intended to be remote from the sun.
  • the electrically conductive contact element 27 runs through the barrier layer 25 and has a contact surface to the back electrode 7 at the end remote from the busbar 13 , the diameter of the contact surface being 10 mm.
  • the photovoltaic element 1 is formed from a plurality of photovoltaic cells 3 which are connected to one another in series by means of laser structuring.
  • the photovoltaic element 1 has two folded busbars 13, with a first folded busbar 13 making electrically conductive contact with the front electrode 5 and a second folded busbar 13 making electrically conductive contact with the rear electrode 7, with the folded busbars 13 having two different potentials electrically conductive contact, preferably both on the front or both on the back of the at least one photovoltaic cell 3 , and/or the first folded busbar 13 and the second folded busbar 13 are arranged on opposite sides in the longitudinal direction of the at least one photovoltaic cell 3 .
  • two folded busbars 13 are arranged on opposite sides in the horizontal extension of the photovoltaic element 1 .
  • a first folded busbar is electrically conductively contacted with a front electrode 5 and a second folded busbar with a rear electrode 7, the first folded busbar 13 being assigned a first potential and the second busbar 13 is associated with a second potential.
  • the folded busbars 13 and the front electrodes 5 and 5 respectively. the back electrodes 7 are each electrically conductively connected to one another with an electrically conductive contact element 29 .
  • the folded busbars 13 of the photovoltaic element 1 are led to a junction box (not shown).
  • a junction box not shown
  • the folded busbars 13 it is also conceivable for the folded busbars 13 to be electrically conductively connected to a junction box through a protective layer 31 .

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Sustainable Energy (AREA)
  • Photovoltaic Devices (AREA)

Abstract

L'invention concerne un élément photovoltaïque (1) avec au moins une cellule photovoltaïque (3) et au moins une barre omnibus repliée (13) qui est mise en contact au niveau de l'électrode avant (5) et/ou une électrode arrière (7) de manière électriquement conductrice, l'au moins une barre omnibus repliée (13) se présente sous la forme d'une section profilée en U, et des bords (15) d'un côté de l'au moins une cellule photovoltaïque (3) sont disposés sur la face interne de la section profilée en forme de U de l'au moins une barre omnibus repliée (13).
PCT/EP2021/087799 2020-12-29 2021-12-29 Élément photovoltaïque avec au moins une cellule photovoltaïque et au moins une barre omnibus repliée WO2022144398A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21847517.6A EP4272258A1 (fr) 2020-12-29 2021-12-29 Élément photovoltaïque avec au moins une cellule photovoltaïque et au moins une barre omnibus repliée

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020134996.3A DE102020134996A1 (de) 2020-12-29 2020-12-29 Photovoltaisches Element mit mindestens einer photovoltaischen Zelle und mindestens einer gefalteten Sammelschiene
DE102020134996.3 2020-12-29

Publications (1)

Publication Number Publication Date
WO2022144398A1 true WO2022144398A1 (fr) 2022-07-07

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EP (1) EP4272258A1 (fr)
DE (1) DE102020134996A1 (fr)
WO (1) WO2022144398A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050011551A1 (en) * 2003-07-14 2005-01-20 Simburger Edward J. Thin film solar cell electrical contacts
US20110308562A1 (en) * 2010-06-22 2011-12-22 Miasole Photovoltaic module electrical connectors
US20160233345A1 (en) * 2013-09-17 2016-08-11 Lg Innotek Co., Ltd. Solar battery module
DE102018132147A1 (de) 2017-12-14 2019-06-19 Ford Global Technologies, Llc Verfahren zum bilden einer sammelschiene und gefaltete sammelschiene

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0786627A (ja) 1993-09-17 1995-03-31 Fuji Electric Co Ltd 薄膜太陽電池モジュールおよび薄膜太陽電池モジュールの製造方法
JP6082294B2 (ja) 2013-03-26 2017-02-15 ローム株式会社 有機薄膜太陽電池およびその製造方法、および電子機器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050011551A1 (en) * 2003-07-14 2005-01-20 Simburger Edward J. Thin film solar cell electrical contacts
US20110308562A1 (en) * 2010-06-22 2011-12-22 Miasole Photovoltaic module electrical connectors
US20160233345A1 (en) * 2013-09-17 2016-08-11 Lg Innotek Co., Ltd. Solar battery module
DE102018132147A1 (de) 2017-12-14 2019-06-19 Ford Global Technologies, Llc Verfahren zum bilden einer sammelschiene und gefaltete sammelschiene

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DE102020134996A1 (de) 2022-06-30

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