Partially flexible photovoltaic laminar product and manufacturing method thereof

Abstract

A method for making a partially flexible photovoltaic laminar product (1), comprising the steps of a) providing a substantially horizontal work (2); b) depositing on the surface (2) a first flexible base layer (3) made of fabric coated with a first polymer material; c) depositing on the first base layer (3) a second coupling substrate (5); d) depositing on the coupling substrate (5) at least one third photovoltaic layer (6) provided with at least one cell made of material with photovoltaic effect and electrical junctions wherein the opposite surfaces (6A, 6B) of the at least one third photovoltaic layer (6) are provided with respective coatings (7A, 7B) made of ethylene-vinyl acetate (EVA); e) depositing on the at least one third photovoltaic layer (6) at least one fourth protection layer (12) made of a second polymer material so as to obtain a sandwich structure (13); f) inserting the structure (13) into a treatment chamber (14) and g) maintaining in the chamber (14) controlled thermal (T) and barometric conditions (P) for a predetermined time (t) to carry out the thermoplastic melting and polymerisation of the layers (3, 5, 7A, 7B, 12) maintaining the at least one cell made of material with photovoltaic effect and the junctions unchanged. The coupling layer (5) is single and it is made of at least one first elastomeric material.

Description

PARTIALLY FLEXIBLE PHOTOVOLTAIC LAMINAR PRODUCT AND MANUFACTURING METHOD THEREOFDESCRIPTIONField of the invention

[0001] The present invention generally relates to the technical field of photovoltaic laminar products and it particularly relates to a method for making a partially flexible photovoltaic laminar product.

[0002] The invention also relates to a partially flexible photovoltaic laminar product.Background art

[0003] Photovoltaic devices adapted to directly convert light energy into electricity by using a surface layer made of semiconductor material have been known long since.

[0004] These photovoltaic devices are generally divided into two different types having a semiconductor material based on crystalline silicon or amorphous silicon respectively.

[0005] The use of crystalline silicon allows to obtain rigid photovoltaic modules applicable to the flat surfaces of a building, while the use of amorphous silicon allows to obtain thin and flexible photovoltaic films applicable to the non-flat surfaces present on the roofing systems of spaces and compartments.

[0006] Generally, there are provided one or more surface layers adapted to coat the semiconductor material in order to allow it to be used on different types of roofing and to protect them from bad weather while maintaining their characteristics intact over time.

[0007] However, the coupling of the semiconductor material to flexible surfaces is carried out by using specific binding agents and it provides for particularly long manufacturing times.

[0008] In order to at least partially overcome such drawbacks, there have been developed methods for making photovoltaic laminar products, which provide for joining a plurality of hot-welded flexible photovoltaic films.

[0009] Document WO2011 / 095304 discloses a flexible photovoltaic laminar product adapted to obtain a roll-up roof comprising a series of photovoltaic films each enclosed in a series of flexible strips made of plastic material.

[0010] The strips are made of ethylene tetrafluoroethylene (ETFE) and each of them is joined to the subsequent strip by means of ultrasonic welding to obtain a continuous surface cover.

[0011] A first drawback of such solution lies in the fact that the manufacturing method is laborious and difficult, with the resulting increase in manufacturing times and costs.

[0012] A further drawback of such solution lies in the fact that the cover has a series of opaque strips interspersed with a series of inactive spaces and devoid of semiconductor material, with the resulting decrease in the active surface and therefore in the total amount of energy collected and converted .

[0013] Another drawback of such solution lies in the fact that the presence of non-active spaces makes the roofing surface semi-transparent and not fully shading.

[0014] A further drawback of such solution lies in the fact that there arises the need to use a dedicated system for obtaining the photovoltaic roofing laminar product.

[0015] In order to at least partially overcome such drawbacks, there have been developed methods for making a flexible photovoltaic laminar product by directly coupling a photovoltaic cell on a flexible base layer made of coated fabric.

[0016] Document EP2773826 discloses a method for coupling at least one photovoltaic cell to a coated fabric by interposing a pressure-sensitive adhesive layer.

[0017] Furthermore, the method provides for obtaining a seam or a thermal welding along an inactive and perimeter area of the photovoltaic cell in order to obtain a layer of air between the module and the base layer.

[0018] However, this type of adhesion or anchoring has a reduced half-life and requires frequent maintenance or replacement.

[0019] A further drawback common to the solutions described above lies in the fact that the various surfaces do not adhere completely but by partial coupling along the periphery of the photovoltaic module, which therefore is not completely integrated with the base layer.

[0020] Document IT20183834 discloses a method for making a flexible photovoltaic laminar product.Technical problem

[0021] In the light of the prior art, the technical problem addressed by the present invention is to integrate at least one cell made of material with photovoltaic effect in a base layer in a homogeneous and durable manner.Summary of the invention

[0022] The object of the present invention is to solve the aforementioned problem by providing a method for making an at least partially flexible photovoltaic laminar product which is highly efficient and cost-effective.

[0023] A particular object of the present invention is to provide a method of the type described above that allows to obtain a unitary photovoltaic laminar product.

[0024] A further particular object of the present invention is to provide is to provide a method of the type described above that allows to full integrate a photovoltaic module in flexible base layer.

[0025] Another object of the invention is to provide a method of the type described above that is easy to use and that can be carried out through existing systems and prior art technologies.

[0026] A further object of the present invention is to provide a method of the type described above that allows to obtain an at least partially flexible photovoltaic laminar product with durable half-life over time.

[0027] The objects mentioned above and others which will be more apparent hereinafter are achieved by a method for making a flexible laminar product, according to claim 1 , comprising the following steps: a) providing a substantially horizontal work surface; b) depositing on the work surface a first flexible base layer made of fabric coated with a first polymer material; c) depositing on the first base layer a second coupling substrate; d) depositingon the second coupling substrate at least one third photovoltaic layer provided with at least one cell made of material with photovoltaic effect and with electrical junctions, wherein the opposite surfaces of the at least one third photovoltaic layer are provided with respective ethylene-vinyl acetate (EVA) coatings and a step e) of depositing on at least one third photovoltaic layer at least one fourth protection layer in a second polymer material so as to obtain a sandwich structure.

[0028] There are further provided the steps f) of inserting the sandwich structure in a treatment chamber and g) maintaining in the chamber controlled thermal and barometric conditions for a predetermined period of time to carry out the thermoplastic melting and the polymerisation of the first layer of the second substrate, of the coatings and of the fourth layer while maintaining said cell made of material with photovoltaic effect and said junctions intact.

[0029] According to a peculiar aspect of the invention, the coupling layer is single and is obtained using at least one first elastomeric material.

[0030] This sequence of operating steps allows to obtain a unitary flexible photovoltaic laminar product in which the cells are fully integrated in the base layer in a homogeneous and durable manner.

[0031] Furthermore, there is provided a step h) of lateral trimming to obtain an edge seam provided with joining means for joining to a structure to which the laminar product is applied or at least one further laminar product.

[0032] The method therefore allows to obtain a flexible photovoltaic laminar product that resists to delamination and it is highly flexible and resistant to mechanical stresses.

[0033] The invention also relates to a partially flexible photovoltaic laminar product, according to claim 12.

[0034] Advantageous embodiments of the invention are attained according to the dependent claims.Brief description of the drawings

[0035] Further characteristics and advantages of the invention will be more apparent in the light of the detailed description of a preferred but not exclusive embodiment of a method for making a partially flexible photovoltaic laminarproduct like the one mentioned above, shown by way of non-limiting example with reference to the drawings below, wherein:FIG. 1 is a block flow diagram of the method for making a partially flexible photovoltaic laminar product subject of the invention;FIG. 2 schematically shows an exploded cross-sectional view of the layers that form the laminar product and a cross-sectional view thereof;FIGS. 3 is a schematic view of the partially flexible photovoltaic laminar product subject of the invention.Detailed description of a preferred embodiment

[0036] With particular reference to the figures mentioned above, there is shown a method for making a partially flexible photovoltaic laminar product 1 that can be used for providing non-flat and flexible covers.

[0037] These covers may comprise tensile structures, covers for airsupported sheds, tarpaulin for trucks, sun shields and other similar movable or stationary covers.

[0038] In a preferred embodiment of the invention, the method comprises a step a) of providing a substantially horizontal work surface 2, which will be described in greater detail below, and a step b) of depositing on the work surface 2 a first flexible base layer 3 made of fabric coated with a first polymer material.

[0039] The first coating polymer material may be selected from the group comprising polyvinyl chloride (PVC), plasticised polyvinyl chloride, thermoplastic polyurethane (TPU), acrylic resins, silicone elastomers, polytetrafluoroethylene (PTFE) polymers and ethylene tetrafluoroethylene (ETFE).

[0040] Furthermore, the first base layer 3 may be obtained starting from a textile support made of high tenacity polyester or acrylic fibres or glass fibres or aramid fibres. This textile support may be subsequently coated or obtained by calandering.

[0041] As shown in FIGS. 1 and 2, the method comprises a step c) of depositing on the first base layer 3 a second coupling substrate 5 and a step d) of depositing on the second coupling substrate 5 at least one thirdphotovoltaic layer 6 provided with at least one cell made material with of photovoltaic effect and electrical junctions.

[0042] The cells of the at least one third photovoltaic layer 6 may have a power comprised between 5.5Wp and 6.3Wp and dimensions comprised between 150x150mm and 170x170mm.

[0043] Suitably, the material with photovoltaic effect with which the cells are made is selected from the group comprising monocrystalline silicon, polycrystalline silicon, amorphous silicon, gallium arsenide, gallium phosphide, indium phosphide, cadmium telluride, copper indium gallium selenide (CIGS), tin sulphide, zinc sulphide, organic perovskite, inorganic perovskite, photovoltaic polymers, dye-sensitized solar cells (DSSC) and quantic points.

[0044] Preferably, the photovoltaic cells are made of monocrystalline silicon, polycrystalline silicon, organic perovskite or inorganic perovskite.

[0045] Furthermore, the opposite surfaces 6A, 6B of the at least one third photovoltaic layer 6 are provided with respective coatings 7A, 7B made of a third polymer material adapted to stabilise the structure thereof, insulating the photovoltaic layer 6 and the electrical junctions from the air.

[0046] As shown in FIG. 2, the coatings 7A, 7B are adapted to respectively cover the upper surface 6A of the at least one third photovoltaic layer 6 in which the photovoltaic cells are present and the lower surface 6B in which the electrical junctions are present.

[0047] The third polymer material of the coatings 7A, 7B comprises ethylene-vinyl acetate (EVA) or a similar polymer having a low coefficient of permeability to water vapour.

[0048] Preferably, the coatings 7A, 7B may have a thickness comprised between 400pm and 650pm.

[0049] The step c) of depositing the second coupling substrate 5 has the function of making compatible in terms of adhesion the surface of the first base layer 3 with the at least one third photovoltaic layer 6.

[0050] According to a peculiar aspect of the invention, the second coupling substrate 5 is single and it is made of at least one first elastomeric material.

[0051] Such elastomeric material may be selected from a series of elastomeric materials having both high adhesion physical characteristics between the first base layer 3 and the coating 7B present on the lower surface 6B of the at least one third photovoltaic layer 6 and chemical characteristics adapted to avoid the oxidation of the electrical junctions.

[0052] The elastomeric polymers of the second coupling substrate 5 may be selected from the group comprising thermoplastic polyurethanes (TPO or TPU) or similar elastomeric polymers.

[0053] Preferably, the second coupling substrate 5 may have a thickness comprised between 380pm and 630pm.

[0054] It is clear that the second coupling substrate 5 has the characteristic of adhering to both layers with which it is placed in contact so as to create a bridge between materials which would not be directly compatible with each other in terms of adhesion.

[0055] In a per se known manner, the at least one third photovoltaic layer 6 may comprise a plurality of thin photovoltaic cells electrically interconnected with each other in series and parallel by means of a film made of metal material.

[0056] As shown in FIGS. 1 and 3, the at least one third photovoltaic layer 6 may be subjected to a step i) of coupling a plurality of laminar strips 10 made of conductive flexible material of the at least one third photovoltaic layer 6 adapted to connect the junctions to a junction box 11 for connecting one or more photovoltaic cells of the third photovoltaic layer 6.

[0057] The method for making an at least partially flexible photovoltaic laminar product 1 comprises a step e) of depositing on the at least one third photovoltaic layer 6 at least one fourth protection layer 12 made of a second polymer material so as to obtain a sandwich structure 13, shown in FIG. 2.

[0058] In a preferred embodiment of the invention, the fourth protection layer 12 may comprise fluorinated polymers such as polytetrafluoroethylene (PTFE) or ethylene tetrafluoroethylene (ETFE).

[0059] Preferably, the fourth protection layer 12 may have a thickness comprised between 350pm and 600pm.

[0060] Suitably, the deposition steps b), c), d) and e) may be fully obtained on the work surface 2, which may comprise an upper surface 2A subjected to suction so as to retain the sandwich structure 13 during the deposition of the superimposed layers.

[0061] Furthermore, the work surface 2 may be inserted into a cleanroom, not shown in the figures, suitably sized to prevent the deposition of unwanted dust or pollutant materials between the layers of the sandwich structure 13.

[0062] In particular, in order to facilitate the implementation of steps b), c), d) and e), the deposition of each layer on the work surface 2 may be obtained automatically and by tensioning the first 3, second 5, at least one third 6 and fourth layer 12.

[0063] In this manner, the presence of a depression on the upper surface 2A of the work surface 2 combined with the tensioning of the layers will allow to obtain a sandwich structure 13 within a particularly short period of time, as better specified below.

[0064] As shown in FIGS. 1 and 2, the method comprises a step f) of inserting the sandwich structure 13 into a treatment chamber 14 and a step g) of maintaining controlled thermal T and barometric conditions P in the chamber 14 for a predetermined period of time t to carry out the thermoplastic melting and the polymerisation of the first 3, second 5 and fourth layer 12 and of the coatings 7A, 7B maintaining the at least one cell made of material with photovoltaic effect and the electrical junctions unchanged.

[0065] Advantageously, the step g) of maintaining controlled thermal T and barometric conditions P will allow to mutually couple the layers eliminating any air inclusions between the various layers and form a unitary flexible photovoltaic laminar product 1.

[0066] In particular, the controlled thermal T and barometric conditions P provide for maintaining in the treatment chamber 14 respectively a substantially uniform temperature T comprised between 140°C and 165°C and a degree of vacuum P variable with time and comprised between 0.3 bar and 1 bar for a predetermined total treatment time t comprised between 900s and 1200s.

[0067] Specifically, the treatment in the chamber 14 is carried out gradually through a succession of steps better described below.

[0068] Initially, upon inserting the sandwich structure 13 into the treatment chamber 14, there occurs a first increase in temperature simultaneously with the application of the vacuum.

[0069] Subsequently, the temperature is maintained stable while the vacuum in the chamber 14 continues to increase.

[0070] Subsequently, the temperature is increased again until it reaches a preset value, and the vacuum is also constantly increased until it reaches a preset value.

[0071] Once the temperature and vacuum have been stabilised, the sandwich structure 13 is maintained under this condition for a pre-established time until the components have been fully molten and polymerised in order to couple the layers together, eliminating any air inclusions, and obtain a unitary flexible photovoltaic laminar product 1.

[0072] Obviously, at the end of the cycle, temperature and pressure will be returned to standard values in order to extract the unitary flexible photovoltaic laminar product 1 from the treatment chamber 14.

[0073] Experimentally, it has been shown that by maintaining in the treatment chamber 14 a temperature T close to 150°C, and barometric conditions P of maximum 1 bar for a total treatment time t preferably of 1100s the at least one third photovoltaic layer 6 and the unitary product 1 meet the requirements laid down in the IEC 61215:2021 and IEC 61730:2016 standards.

[0074] These particular pressure and temperature values for the predetermined time t allow the thermoplastic melting of the first 3, second 5 and fourth layer 12 and coatings 7A, 7B of the at least one third photovoltaic layer 6 and the stable coupling of the first 3 and of the fourth 12 layer to the at least one third photovoltaic layer 6.

[0075] In this manner, the method according to the invention allows to produce a unitary photovoltaic laminar product 1 with characteristics of resistance to mechanical stresses typical of flexible covers.

[0076] As shown in FIG. 2, during the step g) of maintaining controlled thermal T and barometric conditions P there may be provided the positioning on the sandwich structure 13 of a plate having a lower face 15B designed to come into contact with a predetermined, with the fourth protection layer 12.

[0077] The lower face 15B may comprise a plurality of uniformly distributed recesses for providing on the fourth protection layer 12 corresponding lenticular faces, not shown in the figures.

[0078] The lenticular faces may increase the electrical efficiency of at least one third photovoltaic layer 6 during full operation, while at the same time achieving a substantially rough surface to reduce surface tension and facilitate the cleaning of the unitary photovoltaic laminar product 1.

[0079] In an alternative embodiment, not shown in the figures, the fourth protection layer 12 may comprise a clear varnish based on nanostructures deposited by coating or calandering and adapted to facilitate the cleaning of the unitary flexible photovoltaic laminar product 1.

[0080] Lastly, the base layer 3 may be subjected to a step h) of lateral trimming to obtain an edge seam 16, by way of example measuring 80mm, provided with joining means for joining to a structure on which there is applied the laminar product 1 or at least a further laminar product 1 of the same type.

[0081] Such joining means may be selected from the group comprising welding or seaming of a folded or extruded profile.

[0082] Furthermore, the edge seam 16 allows to obtain a protection member of the base layer 3, increasing the half-life of the sandwich structure 13 and avoiding the use of a step for lacquering the base layer 3.

[0083] According to a further aspect of the invention, there is provided a partially flexible photovoltaic laminar product 1 which can be obtained by the method described above.

[0084] Therefore, the flexible laminar product 1 according to the invention comprises a first flexible base layer 3 made of fabric coated with a first polymer material, a second coupling substrate 5 that is single and which is made of a first elastomeric material, at least one third photovoltaic layer 6 provided with at least one cell made of material with photovoltaic effect and electricaljunctions wherein the opposite surfaces 6A, 6B of the at least one third photovoltaic layer 6 are provided with respective coatings 7A, 7B made of ethylene-vinyl acetate (EVA) and at least one fourth protection layer 12.

[0085] Furthermore, the first base layer 3 has an edge seam 16 provided with joining means for joining to a structure on which there is applied the laminar product 1 or to at least one further laminar product 1.

[0086] As shown in FIG. 2, each of the layers may have respective predetermined dimensions and the first base layer 3 may be larger in size than the layers superimposed thereon.

[0087] Suitably, the fourth protection layer 12 may be larger than the second 5 and the at least one third layer 6 so as to almost fully cover the first base layer 3 and create a frame 17 around at least one third photovoltaic layer 6 adapted to house the junction box 11 , as schematically shown in FIG. 3.

[0088] In this manner, the frame 17 will allow the ventilation of junction box 11 and the photovoltaic cells during its use within the unitary photovoltaic laminar product 1 and the cooling of the latter during irradiation and operation at full capacity.

[0089] In addition, a variety of flexible plastic strips covering junction boxes 11 may be coupled by hot-welding or radio-frequency welding along the frame 17.

[0090] Therefore, the frame 17 allows the coupling of laminar product 1 with other photovoltaic laminar products of the same type.

[0091] Obviously, the frame 17 may also be used to join the laminar product 1 to a structure on which it is applied, as described above.

[0092] Alternatively, the method according to the invention may provide for that the deposition steps b) and c) are adapted to provide a first sandwich and that the deposition steps d) and e) are adapted to obtain a second sandwich.

[0093] According to this alternative, before the insertion step f) there are provided a step j) of laminating the second sandwich with controlled thermal T and barometric conditions P for a predetermined time t, a subsequent step k) of trimming the perimeter edge of the second laminated sandwich and a stepI) of coupling the first sandwich with the second laminated and trimmed sandwich.

[0094] The method according to the invention allows to obtain an at least partially flexible photovoltaic laminar product 1 having a particularly small specific weight and with a photovoltaic active surface perfectly integrated with a base layer 3, preferably made of PVC.

[0095] Furthermore, the photovoltaic laminar product 1 obtained using the method resists delamination and it is highly flexible and resistant to mechanical stresses.

[0096] As a matter of fact, according to experimental tests, it was found that the flexible photovoltaic laminar product produced using the method subject of the invention has a higher degree of adhesion of the layers between 25N / cm and 35N / cm.

[0097] In the light of the above, it is clear that the method for making a flexible photovoltaic laminar product and the corresponding flexible laminar product achieve the pre-established objects and in particular they allow to obtain a unitary flexible photovoltaic laminar product in which a thin photovoltaic film is fully integrated with a base layer in a simple and cost- effective manner.

[0098] Although the method and the product have been described with particular reference to the attached figures, the reference numerals used in the description and in the claims are meant for improving the intelligibility of the invention and do not limit the claimed scope of protection in any manner whatsoever.

[0099] Throughout the description, reference to “an embodiment” or “the embodiment” or “some embodiments” indicate that a particular characteristic, structure or element described is comprised in at least one embodiment of the object of the present invention.

[0100] Furthermore, the particular characteristics, structures or elements may be combined in any appropriate fashion in one or more embodiments.Industrial applicability

[0101] The present invention can be applied at industrial level because it can be manufactured on industrial scale by industries belonging to the photovoltaic laminar products manufacturing industry.

Claims

CLAIMS1. A method of making a partially flexible photovoltaic laminar product (1), comprising the following steps: a) providing a substantially horizontal work surface (2); b) depositing on said work surface (2) a first flexible base layer (3) made of fabric coated with a first polymer material; c) depositing on said first base layer (3) a second coupling substrate (5); d) depositing on said second coupling substrate (5) at least one third photovoltaic layer (6) provided with at least one cell made of material with photovoltaic effect and with electrical junctions, the opposite surfaces (6A, 6B) of said at least one third photovoltaic layer (6) being provided with respective coatings (7A, 7B) made of ethylene-vinyl acetate (EVA); e) depositing on said at least one third photovoltaic layer (6) at least one fourth protection layer (12) made of a second polymer material so as to obtain a sandwich structure (13); f) inserting said sandwich structure (13) into a treatment chamber (14); g) maintaining thermal (T) and barometric conditions (P) in said chamber (14) controlled for a predetermined time (t) to carry out the thermoplastic melting and polymerisation of said first layer (3), of said second substrate (5), of said coatings (7A, 7B) and of said fourth layer (12) maintaining said at least one cell made of material with photovoltaic effect and said junctions unchanged; characterised in that said coupling layer (5) is single and it is made of at least one first elastomeric material, and in that said first base layer (3) is subjected to a step h) of lateral trimming to obtain an edge seam (16) provided with joining means for joining to a structure on which there is applied said laminar product (1) or to at least one further laminar product (1).

2. Method as claimed in claim 1 , characterised in that said joining means are selected from the group comprising welding or seam of a folded or extruded section and they form a protection member of said base layer (3) adapted to increase the half-life of said sandwich structure (13) avoiding a step of lacquering said base layer (3).

3. Method as claimed in claim 1 , characterised in that said controlled thermal conditions (T) provide for maintaining a substantially even temperature comprised between 140°C e 165°C and preferably close to 150°C in said treatment chamber (14).

4. Method as claimed in claim 1 , characterised in that said controlled barometric conditions (P) provide for maintaining a degree of vacuum that is variable with time and comprised between 0.3 bar and 1 bar in said treatment chamber (14).

5. Method as claimed in claim 1 , characterised in that said predetermined time (t) is comprised between 900s and 1200s and preferably close to 1100s.

6. Method as claimed in claim 1 , characterised in that said work surface (2) has an upper surface (2A) subjected to suction in order to retain the sandwich structure (13) during the deposition of said superimposed layers and so as to mutually couple said layers eliminating any air inclusions between the various layers and forming a unitary flexible photovoltaic laminar product (1).

7. Method as claimed in claim 1 , characterised in that said first polymer material of said first base layer (3) is selected from the group comprising polyvinyl chloride (PVC), plasticised polyvinyl chloride, thermoplastic polyurethane (TPU), acrylic resins, silicone elastomers, polytetrafluoroethylene (PTFE) polymers, ethylene tetrafluoroethylene (ETFE).

8. Method as claimed in claim 1 , characterised in that there is provided a step i) of coupling a plurality of laminar strips (10) made of conductive flexible material to said at least one third photovoltaic layer (6) to connect said electrical junctions to a junction box (11 ) for connecting one or more cells made of material with photovoltaic effect of said at least one third photovoltaic layer (6).

9. Method as claimed in claim 1 , characterised in that during said step g) of maintaining thermal (T) and barometric conditions (P), there is provided the positioning on said sandwich structure (13) of a plate (15) having a lower face (15B) designed to come into contact with said fourth protection layer (12), saidlower face (15B) having a plurality of evenly distributed recesses adapted to form corresponding lenticular faces on said fourth protection layer (12).

10. Method as claimed in claim 1 , characterised in that said first (3), second (5), at least one third (6) and fourth layer (12) are subjected to tensioning during said steps b), c), d) and e) of deposition on said work surface (2).11 . Method as claimed in claim 1 , characterised in that said deposition steps b) and c) are adapted to obtain a first sandwich and said deposition steps d) and e) are adapted to obtain a second sandwich, before said step f) of insertion there being provided a step j) of laminating said second sandwich with controlled thermal (T) and barometric conditions (P) for a predetermined time (t), a step k) of trimming the peripheral edge of said second laminated sandwich and a step I) of coupling said first sandwich with said second laminated and trimmed sandwich.

12. A partially flexible photovoltaic laminar product (1) obtainable with the method according to one or more of the preceding claims, comprising a first flexible base layer (3) made of fabric coated with a first polymer material, a second coupling substrate (5), at least one third photovoltaic layer (6) provided with at least one cell made of material with photovoltaic effect and electrical junctions wherein the opposite surfaces (6A, 6B) of said at least one third photovoltaic layer (6) are provided with respective coatings (7A, 7B) made of ethylene-vinyl acetate (EVA) and at least one fourth protective layer (12); characterised in that said coupling layer (5) is single and it is made of a first elastomeric material and in that said first base layer (3) has an edge seam (16) provided with joining means for joining to a structure on which there is applied said laminar product (1) or at least one further laminar product (1).

13. Product as claimed in claim 12, characterised in that said joining means comprise a welding or a seam of a folded or extruded section defining a protection member of said base layer (3) adapted to increase the half-life of said sandwich structure (13) avoiding a step of lacquering said base layer (3).

14. Product as claimed in claim 12, characterised in that said material with photovoltaic effect is selected from the group comprising monocrystallinesilicon, polycrystalline silicon, amorphous silicon, gallium arsenide, gallium phosphide, indium phosphide, cadmium telluride, copper indium gallium selenide (CIGS), tin sulphide, zinc sulphide, organic perovskite, inorganic perovskite, photovoltaic polymers, dye-sensitized solar cells (DSSC) and quantic points.

15. Product as claimed in claim 12, characterised in that said first base layer (3) has dimensions greater than those of the other layers superimposed thereon, said at least one fourth layer (12) having dimensions greater than those of said second substrate (5) and at least one third layer (6) so as to almost completely cover said first base layer (3) and create a frame (17) around said at least one third photovoltaic layer (6) to allow the coupling of said laminar product (1) with other photovoltaic laminar products of the same type, or to a structure on which said laminar product (1) is applied.

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