Sandwich panel and building envelope thereof

Abstract

The invention relates to a sandwich panel comprising a photovoltaic active area positioned on the outer sheet and whose electrical connectors are positioned in a first cavity positioned within the insulation material and adjacent to either one of the sides of the insulation material or the inner sheet so that the electrical connectors can be accessed from the first cavity.

Description

[0001] Sandwich panel and building envelope thereof

[0002]

[0001] The present invention relates to a sandwich panel intended for the construction of building envelopes, and more particularly intended for the construction of building roofs, walls, facades and claddings, without being limited thereto. In particular, the invention relates to a building integrated photovoltaic (BIPV) sandwich panel.

[0003]

[0002] Building envelopes are known to be made of sandwich panels comprising an inner sheet, an outer sheet and an insulation material sandwiched between the inner sheet and the outer sheet. Both sheets are usually made of metal and the insulation material is usually polyurethane (PUR) foam, polyisocyanurate (PIR) foam or mineral wool.

[0004]

[0003] It is known from WO2012 / 120489 to laminate together the different layers of a photovoltaic solar collector unit, on a sandwich panel, via pressure exerted by a roll and by heat supplied by a temperature chamber as illustrated in figure 8 of this patent. During this process, the films surrounding the solar cells fuse and embed them in the collector unit. Nevertheless, the temperatures reached during the lamination of the photovoltaic solar collector unit on a sandwich panel damage the insulation material of the sandwich panel, jeopardizing the adhesion between the insulation materials and the metallic sheets.

[0005]

[0004] Meanwhile, improvements in the way the photovoltaic function is integrated in the sandwich panel should neither jeopardize the manufacturing process of sandwich panels in existing production facilities nor impair other functions of the sandwich panel.

[0006]

[0005] The aim of the present invention is therefore to remedy the drawbacks of the prior art by providing a building integrated photovoltaic sandwich panel with improved photovoltaic integration while keeping the process for manufacturing sandwich panels substantially unchanged.

[0007]

[0006] For this purpose, a first subject of the present invention consists of a sandwich panel, for building envelope, comprising an inner sheet, an outer sheet and an insulation material sandwiched between the inner sheet and the outer sheet, the insulation material having a first longitudinal side, a second longitudinal side, an upper transverse side and a lower transverse side, the outer sheet comprising:

[0008] - a first longitudinal outer flange,

[0009] - an outer central part extending from the first longitudinal outer flange, including: o either a first perforation through which a first electrical conductor and a second electrical conductor run, o or a first perforation through which a first electrical conductor runs and a second perforation through which a second electrical conductor runs,

[0010] - a first photovoltaic active area positioned on the outer central part and electrically connected to the first electrical conductor and to the second electrical conductor,

[0011] - a second longitudinal outer flange extending from the outer central part, the first longitudinal outer flange and the second longitudinal outer flange having shapes that allow the overlapping of one on the other, the backside of the outer sheet comprising:

[0012] - a first cable connecting the first electrical conductor to a first electrical connector positioned in a first cavity,

[0013] - a second cable connecting the second electrical conductor to a second electrical connector positioned in the first cavity, the first electrical connector and the second electrical connector being corresponding male and female connectors, the first cavity being positioned within the insulation material and adjacent to either one of the sides of the insulation material or the inner sheet so that the electrical connectors can be accessed from the first cavity.

[0014]

[0007] The first subject of the invention may also have the optional features listed below, considered individually or in combination: - the outer sheet further comprises an upper transverse outer edge bordering an upper overlap area,

[0015] - the outer sheet further comprises a lower transverse outer edge extending beyond the lower transverse side of the insulation material to form a lower overlap area, the upper overlap area and the lower overlap area having shapes that allow the overlapping of the lower overlap area on the upper overlap area,

[0016] - the electrical conductors are conductive ribbons,

[0017] - the first photovoltaic active area substantially covers the first perforation, and the second perforation if any,

[0018] - a first junction box connects the first electrical conductor to the first cable,

[0019] - a second junction box connects the second electrical conductor to the second cable,

[0020] - the first cavity is open along one of the sides of the insulation material and / or along the inner sheet,

[0021] - the first cavity is open along one of the transverse sides of the insulation material through a cut in the insulation material and / or through a cut in a cap covering the insulation material and / or through a cut in a wall of the first cavity,

[0022] - the first cavity is open along the inner sheet through a first hole in the inner sheet,

[0023] - the inner sheet comprises a first groove extending from the first cavity to the upper transverse side of the insulation material,

[0024] - the first cavity is delimited by a casing embedded in the insulation material,

[0025] - the first cavity prevents the first electrical connector and the second electrical connector from being trapped in the insulation material,

[0026] - the casing is made of a foamed material,

[0027] - the casing comprises an inlet for cable insertion and an outlet for accessing the first electrical connector and the second electrical connector, - the first cavity has a wall in the plane of one of the sides of the insulation material,

[0028] - the first cavity is in contact with the inner sheet,

[0029] - the first cavity comprises a portion of the first cable and a portion of the second cable,

[0030] - the portion of the first cable and the portion of the second cable are folded in the first cavity,

[0031] - the inner sheet comprises: o An inner central part substantially lying in a plane P, o A first longitudinal inner flange extending inwards from a first longitudinal extremity of the inner central part and forming an inner edge rabbet in the insulation material along its first longitudinal side, o A second longitudinal inner flange extending from a second longitudinal extremity of the inner central part by projecting from the second longitudinal side of the insulation material and forming an inner tongue extending in parallel to plane P and outwards, the inner edge rabbet and the inner tongue having shapes that allow their interlocking,

[0032] - the outer central part further includes: o either a third perforation through which a third electrical conductor and a fourth electrical conductor run, o or a third perforation through which a third electrical conductor runs and a fourth perforation through which a fourth electrical conductor runs,

[0033] - the outer sheet further comprises a second photovoltaic active area positioned on the outer central part and electrically connected to the third electrical conductor and to the fourth electrical conductor,

[0034] - the second photovoltaic active area substantially covers the third perforation, and the fourth perforation if any,

[0035] - the second electrical conductor is connected to the second electrical connector positioned in the first cavity, through consecutively: o a linking cable connecting the second electrical conductor to the third electrical conductor, o the second photovoltaic active area, o the second cable connecting the fourth electrical conductor to the second electrical connector,

[0036] - the backside of the outer sheet further comprises: o a third cable connecting the third electrical conductor to a third electrical connector positioned in either the first cavity or a second cavity, o a fourth cable connecting the fourth electrical conductor to a fourth electrical connector positioned in the same cavity as the third electrical connector, the third electrical connector and fourth electrical connector being corresponding male and female connectors,

[0037] - a third junction box connects the third electrical conductor to the third cable,

[0038] - a fourth junction box connects the fourth electrical conductor to the fourth cable,

[0039] - the first photovoltaic active area and the second photovoltaic active area extend in the longitudinal axis parallel to each other,

[0040] - the third electrical connector and the fourth electrical connector are corresponding male and female connectors,

[0041] - a non-conductive grommet is inserted in the first perforation,

[0042] - a non-conductive grommet is inserted in the second perforation,

[0043] - the non-conductive grommet comprises an opening for the passing of an electrical conductor, an upper part larger than the perforation and a lower part narrower than the perforation and a plurality of crenellations,

[0044] - The outer central part of the outer sheet further comprises by-pass perforations.

[0045]

[0008] A second subject of the invention consists of a sandwich panel, for building envelope, comprising an inner sheet, an outer sheet and an insulation material sandwiched between the inner sheet and the outer sheet, the insulation material having a first longitudinal side, a second longitudinal side, an upper transverse side and a lower transverse side, the outer sheet comprising:

[0046] - a first longitudinal outer flange,

[0047] - an outer central part extending from the first longitudinal outer flange, including: o either a first perforation through which a first electrical conductor and a second electrical conductor run, o or a first perforation through which a first electrical conductor runs and a second perforation through which a second electrical conductor runs,

[0048] - a first photovoltaic active area positioned on the outer central part and electrically connected to the first electrical conductor and to the second electrical conductor,

[0049] - a second longitudinal outer flange extending from the outer central part, the first longitudinal outer flange and the second longitudinal outer flange having shapes that allow the overlapping of one on the other, the backside of the outer sheet comprising:

[0050] - a first cable connected to the first electrical conductor and running through at least a first cavity and either a cut in one of the sides of the insulation material or a first hole in the inner sheet, up to a first electrical connector,

[0051] - a second cable connected to the second electrical conductor and running through at least the first cavity and either the cut in on of the sides of the insulation material or the first hole in the inner sheet, up to a second electrical connector, the first electrical connector and the second electrical connector being corresponding male and female connectors, the first cavity being positioned within the insulation material and adjacent to either one of the sides of the insulation material or the inner sheet.

[0009] A third subject of the invention consists of a process for manufacturing a sandwich panel according to the invention, comprising:

[0052] - Providing an outer sheet comprising: o an outer central part including:

[0053] ■ either a first perforation through which a first electrical conductor and a second electrical conductor run,

[0054] ■ or a first perforation through which a first electrical conductor runs and a second perforation through which a second electrical conductor runs, o a first photovoltaic active area positioned on the outer central part and electrically connected to the first electrical conductor and to the second electrical conductor, the backside of the outer sheet comprising:

[0055] ■ a first cable connecting the first electrical conductor to a first electrical connector positioned in a first cavity,

[0056] ■ a second cable connecting the second electrical conductor to a second electrical connector positioned in the first cavity, the first electrical connector and the second electrical connector being corresponding male and female connectors, the first cavity being positioned on the backside of the outer sheet,

[0057] - Providing an inner sheet,

[0058] - Putting insulation in place,

[0059] - Maintaining the inner sheet at a given distance from the outer sheet.

[0060]

[0010] The third subject of the invention may also have the optional features listed below, considered individually or in combination:

[0061] - the first cavity is attached to the backside of the outer sheet,

[0062] - the inner sheet is provided cut to size and shaped, - the outer sheet and the inner sheet are positioned in a mold at the given distance from each other,

[0063] - a reaction mix is injected in the mold between the inner sheet and the outer sheet so that the reaction mix reacts, expands to fill the gap between the inner sheet and the outer sheet and forms the insulation material,

[0064] - the inner sheet is provided in the form of an inner strip entering a double-belt conveyor of a manufacturing line,

[0065] - the outer sheet is part of a continuous feeding of the manufacturing line in outer sheets,

[0066] - a reaction mix is applied to the backside of the outer sheet or to the backside of the inner strip so that the reaction mix reacts, expands in the double-belt conveyor to fill the gap between the inner strip and the outer sheet and forms the insulation material,

[0067] - it further comprises opening the first cavity to give access to the first electrical connector and to the second electrical connector,

[0068] - it further comprises, before providing the outer sheet, preparing the outer sheet according to the following steps: o the outer sheet is cut to length from a strip, o the first perforation is done in the outer central part, o the first photovoltaic active area is positioned on the outer central part, o the backside of the outer sheet is equipped with the first cable, the first electrical connector, the second cable, the second electrical connector and the first cavity,

[0069] - the outer sheet is shaped after lamination of the first photovoltaic active area,

[0070] - the first photovoltaic active area is laminated on the outer central part.

[0071]

[0011] A fourth subject of the invention consists of a process for the assembling of a building envelope on a building structure, comprising: - (i) providing a first and a second sandwich panel according to the invention,

[0072] - (ii) fastening the first sandwich panel to the building structure,

[0073] - (iii) positioning the second sandwich panel so that: o either one of the longitudinal sides of its insulation material is adjacent to one of the longitudinal sides of the insulation material of the first sandwich panel, o or one of the transverse sides of its insulation material is adjacent to one of the transverse sides of the insulation material of the first sandwich panel, and fastening the second sandwich panel to the building structure,

[0074] - (iv) connecting one of the electrical connectors of the first sandwich panel to one of the electrical connectors of the second sandwich panel.

[0075]

[0012] As it is apparent, the invention is based on the recourse to traditional methods for manufacturing sandwich panels, the semi-continuous method or the discontinuous method, where the laying of the insulation material is one of the last steps of the method, if not the last one. These traditional methods are substantially unchanged so that both standard sandwich panels and BIPV sandwich panels can be manufactured with the same existing line or press. Accordingly, the photovoltaic active area is positioned on the outer sheet alone, before the outer sheet is provided for the making of the sandwich panel. In particular, electrical conductors connected to the photovoltaic active area run through the outer sheet before lamination in such a way that the flatness of the lamination is not compromised. Also, except the photovoltaic active area itself, there is no protruding part on the upper side of the outer sheet so that the laying of the insulation material in existing production facilities is not compromised. Also, the sandwich panel is prewired before the insulation is put in place in such a way that the cables needed to electrically connect adjacent panels are within the boundaries of the sandwich panel. In particular, the cables needed to electrically connect adjacent panels are reserved in a cavity that gets embedded in the insulation material and which can be opened afterwards to access, and possibly extract, the cables and connect the panels. Also, as the sandwich panel is prewired before the insulation is put in place, the sandwich panel does not comprise any hole made, at once, in the outer sheet, the insulation material and the inner sheet. This improves the watertightness of the sandwich panel. Similarly, the cavity is not open along the outer sheet, i.e is closed along the outer sheet.

[0076]

[0013] Other characteristics and advantages of the invention will be described in greater detail in the following description.

[0077]

[0014] The invention will be better understood by reading the following description, which is provided purely for purposes of explanation and is in no way intended to be restrictive, with reference to:

[0078] - Figure 1 , which is a perspective view of the sandwich panel according to the invention,

[0079] - Figure 2, which is a perspective view of the sandwich panel according to the invention,

[0080] - Figure 3, which is a perspective view of the sandwich panel according to the invention,

[0081] - Figure 4, which is a perspective view of the sandwich panel according to the invention,

[0082] - Figure 5, which is a cross-section of the sandwich panel according to a first embodiment of the invention,

[0083] - Figure 6, which is a cross-section of the sandwich panel according to a second embodiment of the invention,

[0084] - Figure 7, which is a cross-section of the sandwich panel according to a third embodiment of the invention,

[0085] - Figure 8, which is a perspective view of the sandwich panel according to the invention,

[0086] - Figure 9, which is a view of the upper side of the outer sheet of the sandwich panel according to the embodiment of Figure 8,

[0087] - Figure 10, which is a view of the backside of the outer sheet of the sandwich panel according to the embodiment of Figure 8, - Figure 11 , which is a perspective view of the sandwich panel according to a first embodiment of the wiring,

[0088] - Figure 12, which is a view of the upper side of the outer sheet of the sandwich panel according to the variant of Figure 11 ,

[0089] - Figure 13, which is a view of the backside of the outer sheet of the sandwich panel according to the variant of Figure 11 ,

[0090] - Figure 14, which is a perspective view of the sandwich panel according to a second embodiment of the wiring,

[0091] - Figure 15, which is a view of the upper side of the outer sheet of the sandwich panel according to the variant of Figure 14,

[0092] - Figure 16, which is a view of the backside of the outer sheet of the sandwich panel according to the variant of Figure 14,

[0093] - Figure 17, which is a view of the grommet of the sandwich panel according to the invention,

[0094] - Figure 18, which is a cross-section of the sandwich panel according to a first embodiment of the cavity positioning,

[0095] - Figure 19, which is a perspective view of the upper part of the sandwich panel according to a first embodiment of the cavity positioning,

[0096] - Figure 20, which is a perspective view of the upper part of the sandwich panel according to a first embodiment of the cavity positioning,

[0097] - Figure 21 , which is a perspective view of the upper part of the sandwich panel according to a first embodiment of the cavity positioning,

[0098] - Figure 22, which is a cross-section of the sandwich panel according to a third embodiment of the cavity positioning,

[0099] - Figure 23, which is a perspective view of the upper part of the sandwich panel according to a third embodiment of the cavity positioning,

[0100] - Figure 24, which is a cross-section of the sandwich panel according to a fifth embodiment of the cavity positioning, - Figure 25, which is a perspective view of the upper part of the sandwich panel according to a fifth embodiment of the cavity positioning,

[0101] - Figure 26, which is a perspective view of the upper part of the sandwich panel according to a fifth embodiment of the cavity positioning,

[0102] - Figure 27, which is a perspective view of the assembling of two sandwich panels according to the invention on a building structure.

[0103]

[0015] It should be noted that the terms “inwards” and “outwards” as used in this application refer to the positions and orientations of the different constituent elements of the panel in relation to the position of the insulation material. Consequently, if an element extends inwards, it extends in the direction of the insulation material. Similarly, if the element extends outwards, it extends in the opposite direction of the insulation material.

[0104]

[0016] It should also be noted that, to ease the description, the panels will be described in relation to their usual position on a building roof. Consequently, the terms “inner” and “outer” as used in this application refer to this usual position. Accordingly, the outer sheet is facing the outside and the inner sheet is facing the inside of the building. Accordingly, the inner flange refers to the flange of the inner sheet and the outer flange refers to the flange of the outer sheet. Similarly, spatially relative terms such as “above”, “below”, “lower”, “upper”... as used in this application refer to the positions and orientations of the different constituent elements of the sandwich panel when the latter is positioned on a roof. Accordingly, “below” does not mean “underneath”.

[0105]

[0017] Throughout the text, a photovoltaic active area is understood to mean a stack of a plurality of layers which comprises a layer:

[0106] - capable of converting solar energy into electricity and

[0107] - protected from the outside by insulating layers.

[0108]

[0018] Such stacks usually comprise a foil of insulating material called backsheet, a first layer of encapsulation material, solar cells connected via ribbons and busbars, a second layer of encapsulation material and a transparent foil of insulation material called frontsheet. The solar cells are usually themselves composed of several layers among which a substrate, a back-electrode, a p-n junction (which is capable of converting solar energy into electricity) and a front electrode. The solar cells can notably be waferbased crystalline silicon cells or thin-film cells. The solar cells can be grouped into modules. The photovoltaic active area can comprise bypass diodes, generally placed every 18-24 cells, which prevent the destructive effects of hot-spot heating when a cell or module becomes shaded or faulty. Each photovoltaic active area has a first polarity and a second polarity, for connection to other photovoltaic active areas or to the grid. More preferably, each photovoltaic active area does not have more than a single pair of a first polarity and a second polarity. When two or more photovoltaic active areas are positioned next to each other, they can have their own backsheet and frontsheet or they can share one single backsheet and / or one single frontsheet.

[0109]

[0019] Throughout the text, a sheet is understood to mean an element that has a flat shape, i.e. , its thickness is low compared to its other dimensions. Generally speaking, its thickness is 500 to 4000 times lower than its width. The sheet may be made of a single material or a composite assembly. In the latter case, the sheet is a stack of a plurality of layers of the same material or different materials. The material in question may be, among others, a metallic material or a polymer. Steel, aluminum, copper and zinc may be cited as nonrestricting examples of metallic materials. The sheet is preferably a metallic sheet. It is preferably made of previously galvanized and pre-coated steel to protect it against corrosion. The inner sheet and the outer sheet are examples of sheets.

[0110]

[0020] In the context of the invention, the sheet will preferably have been previously formed with the aid of any known forming method, including, by way of non-restricting examples, bending, forming, stamping and molding. In particular, the U-shaped bend described later on is an element of the panel whose manufacturing process is not limited to bending.

[0111]

[0021] This forming can lead among other things to the formation of longitudinal flanges, ribs, stiffeners, grooves, mortises, tenons, tongues, edge rabbets on the surface of the sheet. Throughout the text, a rib is understood to mean a protrusion formed on the surface of the sheet. The rib may have a trapezoidal shape or a rectangular, corrugated, sinusoidal or even omega shape, for example. It includes a top central part and two lateral wings. A stiffener is a rib of limited height, generally 10 to 30 times lower than a rib. Ribs or stiffeners are generally placed in parallel to the longitudinal edges of the sheet notably to render the sheet more rigid and are then defined as longitudinal ribs or longitudinal stiffeners. Throughout the text, a groove is understood to mean a recess formed on the surface of the panel. The groove can have shapes similar to the ones offered for ribs.

[0112]

[0022] With reference to Figures 1 to 4, the sandwich panel 1 according to the invention first comprises an insulation material 2 sandwiched between an inner sheet 3 and an outer sheet 4. The insulation material is delimited by a first longitudinal side 5, a second longitudinal side 6, an upper transverse side 7 and a lower transverse side 8. The inner sheet substantially lies down flat in a plane P.

[0113]

[0023] The insulation material 2 can be any material providing some insulation to the sandwich panel 1. It can be, by way of non-restricting examples, polyurethane foam, polyisocyanurate foam, phenolic foam, mineral wool, wood wool and their mixtures. It is preferably a foamed insulation material.

[0114]

[0024] Some of the sides of the insulation material, in particular the longitudinal sides, can comprise an edge band 9 covering the insulation material. The edge band runs along the given side. The edge band notably prevents the insulation foam from expanding beyond the sandwich panel during manufacturing and prevents the equipment from being soiled by the foam. The edge band can be made of, by way of non-restricting examples, foamed plastic, plastic film, kraft paper, cardboard.

[0115]

[0025] Some of the sides, in particular the transverse sides, can comprise a cap 10 covering the insulation material. The cap substantially closes the gap between the inner sheet 3 and an outer sheet 4. Such caps are usually used in the discontinuous manufacturing methods to prevent the insulation foam from expanding beyond the sandwich panel during manufacturing. They can be made of, by way of non-restricting examples, foamed plastic, plastic film, kraft paper, cardboard.

[0116]

[0026] With reference to Figures 2, 4 and 5 to 7, the outer sheet 2 is a sheet of rectangular shape comprising a first longitudinal outer edge 11 , a second longitudinal outer edge 12, an upper transverse outer edge 13 and a lower transverse outer edge 14. A first longitudinal outer flange 15 runs along the first longitudinal outer edge 11 and a second longitudinal outer flange 16 runs along the second longitudinal outer edge 12. The first longitudinal outer flange 15 and the second longitudinal outer flange 16 are connected by an outer central part 17. Preferably, the latter substantially lies down flat in a plane parallel to plane P.

[0117]

[0027] The sandwich panel is designed so that:

[0118] - the first longitudinal outer flange 15 of a first sandwich panel can overlap the second longitudinal outer flange 16 of a second sandwich panel laterally adjacent and so that the second longitudinal outer flange of the first sandwich panel can be overlapped by the first longitudinal outer flange of a third sandwich panel laterally adjacent, or

[0119] - the first longitudinal outer flange 15 of a first sandwich panel can be overlapped by the second longitudinal outer flange 16 of a second sandwich panel laterally adjacent and the second longitudinal outer flange of the first sandwich panel can overlap the first longitudinal outer flange of a third sandwich panel laterally adjacent.

[0120]

[0028] Consequently, according to a first embodiment of the outer sheet illustrated on Figures 1 to 5, the first longitudinal outer flange 15 of the outer sheet comprises a first longitudinal rib 18, as defined above, projecting from the first longitudinal side 5 of the insulation material. By “projecting”, it is meant that the first longitudinal outer flange extends beyond the first longitudinal side of the insulation material, in particular beyond the plane of the first longitudinal side. In the example illustrated, the first longitudinal rib 18 has a trapezoidal shape with a top central part 19 and two lateral wings 20. As the first longitudinal rib 18 projects from the insulation material, its underside is thus not covered with the insulation material. The first longitudinal rib 18 can thus overlap the second longitudinal outer flange 16 of a sandwich panel laterally adjacent without discontinuities in the insulation material.

[0121]

[0029] Accordingly, the second longitudinal outer flange 16 of the outer sheet comprises a second longitudinal rib 21 , the first longitudinal rib 18 and the second longitudinal rib 21 having shapes that allow the overlapping of the first longitudinal rib on the second longitudinal rib. In the example illustrated, the second longitudinal rib 21 has a trapezoidal shape, with a top central part 19 and two lateral wings 20, with substantially the same shape as the first longitudinal rib 18. It provides an efficient watertightness. The underside of the second longitudinal rib is preferably fully covered with the insulation material. It further improves the thermal insulation of the assembly.

[0122]

[0030] Similarly, the sandwich panel can be designed so that the lower part of a first sandwich panel can partially overlap the upper part of a second sandwich panel positioned lower along the roof slope and so that the upper part of the first sandwich panel can be partially overlapped by the lower part of a third sandwich panel positioned higher along the roof slope.

[0123]

[0031] Consequently, the lower transverse outer edge 14 of the outer sheet can extend beyond the lower transverse side 8 of the insulation material. The corresponding projection, i.e. the portion of the outer sheet extending from its lower transverse outer edge 14 to the lower transverse side 8 of the insulation material, is defined as the lower overlap area 22. As its underside is not covered with the insulation material, the lower overlap area of one sandwich panel can cover the upper part of a lower adjacent sandwich panel. The upper part of the sandwich panel that can be covered by the lower overlap area is defined as the upper overlap area 23. It is bordered by the upper transverse outer edge 13 and its height (taken parallel to the longitudinal edge of the outer sheet) is de facto substantially identical to the distance between the lower transverse outer edge 14 of the outer sheet and the lower transverse side 8 of the insulation material (i.e. the height of the lower overlap area) since sandwich panels are assembled without discontinuities in the insulation material. The height of the upper overlap area and lower overlap area is generally comprised between 150 and 500mm, depending notably on the roof pitch.

[0124]

[0032] The lower overlap area 22 and the upper overlap area 23 have shapes that allow the overlapping of the lower overlap area on the upper overlap area. This means that, apart from the portions of the first longitudinal rib 18 and second longitudinal rib 21 that are present in the upper and lower overlap areas, the lower overlap area 22 and the upper overlap area 23 do not comprise shaped areas that prevent the overlapping. Such areas might be for example, a groove in the lower overlap area that does not match a groove in the upper overlap area. Preferably, apart from the portions of the first longitudinal rib 18 and second longitudinal rib 21 that are present in the upper and lower overlap areas, the lower overlap area 22 and the upper overlap area 23 are preferably flat.

[0125]

[0033] According to a second embodiment of the outer sheet illustrated on Figure 6, the first longitudinal outer flange 15 of the outer sheet comprises an outer mortise 102, extending inwards. In the example illustrated, the outer mortise is in the form of a U-shaped bend extending substantially in parallel to the outer central part 17. In particular, the outer mortise comprises two branches substantially parallel and linked by a U-turn. More preferably, the two parallel branches have substantially the same length. Other designs of outer mortise are possible. It can notably have a V-shape with two branches converging towards a U-turn. It can also have a L-shape with a branch and a seat.

[0126]

[0034] According to a variant of the second embodiment, the first longitudinal outer flange 15 comprises a first outer riser 104 extending between the first longitudinal extremity of the outer central part and the outer mortise, as illustrated on Figure 6. The first outer riser can extend substantially perpendicular to the outer central part, i.e. perpendicular to plane P, or can be inclined towards the outer mortise, or can be inclined towards the outer central part.

[0127]

[0035] According to another variant of the second embodiment, the first longitudinal outer flange 15 comprises a first extension 105 extending inwards between the first longitudinal extremity of the outer central part, or the first outer riser if applicable, and the outer mortise, or the first outer riser or another outer riser if applicable, as illustrated on Figure 6. Preferably, the first extension is substantially flat. Preferably, the first extension extends substantially in parallel to the outer central part 17. It forms with the outer central part a male protrusion 106 designed for and capable of covering the head of a fastener inserted in the second longitudinal outer flange 16 of an adjacent panel.

[0128]

[0036] In accordance with the outer mortise, the second longitudinal outer flange 16 of the outer sheet comprises an outer tenon 103 extending outwards, the outer tenon and the outer mortise having shapes that allow the overlapping of one longitudinal outer flange on the other, i.e. the interlocking of the outer tenon and the outer mortise. In the example illustrated, the outer tenon projects from the second longitudinal side 6 of the insulation material. By “projects”, it is meant that the second longitudinal outer flange 16 extends beyond the second longitudinal side of the insulation material, in particular beyond the plane of the second longitudinal side.

[0129]

[0037] In the example illustrated, the outer tenon is in the form of a U-shaped bend extending substantially in parallel to the outer central part 17. In particular, the outer tenon comprises two branches substantially parallel and linked by a U-turn. More preferably, the two parallel branches have substantially the same length. Other designs of outer tenon are possible. It can notably have a V-shape with two branches converging towards a U-turn. It can also have a L-shape with a branch and a seat.

[0130]

[0038] According to a variant of the second embodiment, the second longitudinal outer flange 16 comprises a second outer riser 107 extending between the second longitudinal extremity of the outer central part and the outer tenon, as illustrated on Figure 6. The second outer riser can extend substantially perpendicular to the outer central part, i.e. perpendicular to plane P, or can be inclined towards the outer tenon, or can be inclined towards the outer central part.

[0131]

[0039] According to another variant of the second embodiment, the second longitudinal outer flange 16 comprises an outer edge rabbet 108 extending inwards between the second longitudinal extremity of the outer central part and the outer tenon, as illustrated on Figure 6. The outer edge rabbet forms a recess in which a fastener head can be accommodated. Preferably, the fastener head can be covered, and thus hidden, by the male protrusion 106 of the first longitudinal outer flange 15 of an adjacent sandwich panel. Accordingly, the shapes of the outer edge rabbet and of the male protrusion are adjusted so that a fastener head can be positioned between them.

[0132]

[0040] Preferably, the outer edge rabbet 108 extends substantially in parallel to the outer central part 17. Preferably, the outer edge rabbet comprises, successively and starting from the second longitudinal extremity of the outer central part, a second outer riser 107, as described above, and a second extension 109. The second outer riser can extend substantially perpendicular to the outer central part or can be inclined towards the second extension. The latter is preferably parallel to plane P to facilitate the screwing of a fastener in this portion of the sandwich panel.

[0133]

[0041] The outer mortise 102 and the outer tenon 103 have shapes that allow the overlapping of one longitudinal outer flange on the other when one sandwich panel is assembled with a sandwich panel laterally adjacent. Preferably, their shapes are substantially complementary and their dimensions are such that:

[0134] - The height of the outer mortise (measured along the vertical axis Z) is superior to the height of the outer tenon,

[0135] - The width of the outer mortise (measured along the transversal axis Y) is superior or equal to the width of the outer tenon.

[0136]

[0042] Such interlocking of the outer mortise and the outer tenon improves the resistance, notably to wind suction, of the envelope made of sandwich panels.

[0137]

[0043] The sandwich panel is divided into an upper half and a lower half. The upper half starts from the upper transverse side 7 of the insulation material (which corresponds to the upper transverse outer edge 13 of the outer sheet) and extends to half the length of the outer sheet (the length being taken parallel to the longitudinal edge of the outer sheet). The upper half of the sandwich panel thus corresponds to the upper half of the outer sheet. The lower half starts from the lower transverse outer edge 14 of the outer sheet and extends to half the length of the outer sheet. The lower half of the sandwich panel thus corresponds to the lower half of the outer sheet.

[0138]

[0044] With reference to Figures 1 and 2, the sandwich panel 1 is a building integrated photovoltaic (BIPV) sandwich panel. Accordingly, it comprises a first photovoltaic active area 24, as defined above, positioned on the outer central part 17 and the components for the electrical connections of the first photovoltaic active area to other sandwich panels or to the grid are integrated in the thickness of the sandwich panel.

[0139]

[0045] In particular, the first photovoltaic active area 24 is directly built on the outer central part of the outer sheet before the sandwich panel is manufactured. In particular, it is laminated on the outer central part of the outer sheet. It strongly improves the watertightness of the sandwich panel.

[0140]

[0046] The first photovoltaic active area 24 is preferably dimensioned so that, on one hand, no part of it is covered by an adjacent sandwich panel when the panels are assembled and, on the other hand, the active surface is maximized. Accordingly, the upper transverse edge of the first photovoltaic active area is positioned preferably as close as possible to the upper transverse outer edge 13 of the outer sheet, or as close as possible to the upper overlap area if applicable, and the lower transverse edge of the first photovoltaic active area is positioned preferably as close as possible to the lower transverse outer edge 14 of the outer sheet. Similarly, in the variant of the invention where there is only one photovoltaic active area, the first longitudinal edge of the first photovoltaic active area is as close as possible to the first longitudinal outer flange 15 and the second longitudinal edge of the first photovoltaic active area is as close as possible to the second longitudinal outer flange 16.

[0141]

[0047] The first photovoltaic active area 24 is electrically connected to a first electrical conductor 25 and to a second electrical conductor 26. In particular, a first polarity of the first photovoltaic active area is connected to the first electrical conductor and a second polarity of the first photovoltaic active area is connected to the second electrical conductor. As the first photovoltaic active area 24 is on the upper side of the outer sheet and the electrical connections are in the thickness of the sandwich panel, the first and second electrical conductors run through the outer sheet. In the variant illustrated on Figure 8, the first electrical conductor 25 and the second electrical conductor 26 are conductive ribbons, also known as conductive busbars. They are part of the first photovoltaic active area. They are preferably directly connected to PV cells of the first photovoltaic active area. They are both running on the surface of the outer sheet and then through the outer sheet. In another variant (not illustrated), the first electrical conductor 25 and the second electrical conductor 26 are intermediate electrical conductors connected to a conductive ribbon of the first photovoltaic active area. The first electrical conductor 25 and the second electrical conductor 26 can notably be embedded in a non-conductive grommet 29 described below. In that case, the conductive ribbons of the first photovoltaic active area can run on the surface of the outer sheet and can be connected to the first electrical conductor 25 and the second electrical conductor 26 that run through the outer sheet.

[0142]

[0048] Consequently, and with reference to Figures 8, 9, 11 , 12, 14 and 15, the outer central part 17 comprises a first perforation 27 through which the first electrical conductor runs. In a first variant, the second electrical conductor also runs through the first perforation. Alternatively, the outer central part 17 further comprises a second perforation 28 through which the second electrical conductor runs. The position of the first perforation, and second perforation if applicable, can depend notably on the positions of the first and second polarities of the photovoltaic active area and on the positions of the electrical connections in the thickness of the sandwich panel. In a variant, the first perforation, respectively the second perforation if applicable, is positioned in the upper half of the sandwich panel, preferably below (i.e. adjacent to) the upper transverse end of the photovoltaic active area or below the upper overlap area if applicable. In another variant, the first perforation, respectively the second perforation if applicable, is positioned in the lower half of the sandwich panel, preferably above (i.e. adjacent to) the lower transverse end of the photovoltaic active area or above the lower overlap area if applicable. Preferably, the first perforation and second perforations are positioned adjacent to one another. More preferably, the first perforation and second perforation are substantially aligned in the longitudinal axis Y.

[0143]

[0049] Preferably, the width of the perforations (i.e. the longest length measured in the X-Y plane) is of the order of magnitude of the diameter of an electrical connector, as described below. In particular, the width is inferior to 3 cm, more preferably inferior to 2 cm. In other words, the perforations are not capable of receiving an electrical connector housing. Such a width further minimizes the negative impact a hole can have on the lamination of the photovoltaic active area on the outer sheet alone and further improves the watertightness of the sandwich panel.

[0144]

[0050] For waterproofing reasons, the first perforation, and the second perforation if applicable, is preferably covered by at least one layer of the first photovoltaic active area. More preferably, the first perforation, and the second perforation if applicable, is covered by the frontsheet. Even more preferably, it is covered by the frontsheet, a layer of encapsulation material and possibly at least partially the backsheet. Also, the first perforation, and the second perforation if applicable, can be substantially below the layer capable of converting solar energy into electricity. By substantially below it is meant here that it can be below this layer even if there are no PV cells strictly above the perforation. The first perforation, and the second perforation if applicable, can also be substantially covered by the first photovoltaic active area. By substantially covered, it is meant here that it is overall below the photovoltaic active area even if the perforation is not strictly covered by all the layers of the photovoltaic active area.

[0145]

[0051] Preferaby, the inward end of the first electrical conductor is adjacent to the first perforation. This inward end can also be substantially plumb with the first perforation. Preferaby, the inward end of the second electrical conductor is adjacent to either the first or second perforation. This inward end can also be substantially plumb with either the first or second perforation.

[0146]

[0052] Having the first electrical conductor and the second electrical conductor going through a perforation is advantageous. As there are no junction boxes or other protruding parts on the upper side of the outer sheet, the step of forming the insulation material in existing production facilities is not compromised. Also, in the case of electrical conductors in the form of conductive ribbons or in the case of electrical conductors integrated in a non- conductive grommet, as they are thin, their ends lying against the backside of the outer sheet during the lamination of the photovoltaic active area have no impact on the flatness of the outer sheet. Accordingly, the lamination of the photovoltaic active area can be efficiently performed on the outer sheet alone, without modifying existing lamination equipment to accommodate parts protruding from the surface of the backside of the outer sheet. Moreover, in the case of electrical conductors in the form of conductive ribbons, the connection of the conductive ribbon to the rest of the electrical circuit is not done between the outer sheet and the photovoltaic active area. Such connection tends to be thick compared to the thickness of the photovoltaic active area and to jeopardize the lamination of the latter.

[0147]

[0053] With reference to Figures 8, 11 , 14, 17, 22 and 24, for electrical safety reasons, and in the case where the outer sheet is made of a conductive material, the first electrical conductor 25, respectively the second electrical conductor 26, is preferably electrically insulated from the edge of the perforation 27 or 28, by a non-conductive grommet 29 inserted in the perforation. Firstly, the non-conductive grommet can comprise an opening 30 for the passing of an electrical conductor. The size of the opening is adapted to the size of the electrical conductor. The non-conductive grommet can further comprise an upper part 31 larger than the perforation. The non- conductive grommet can thus rest on the outer sheet. The upper part can be thin enough to further avoid lamination issues of the photovoltaic active area. The non-conductive grommet can further comprise a lower part 32 narrower than the perforation and comprising a plurality of crenellations 321 . The lower part being narrowed than the perforation, the non-conductive grommet can easily be positioned in the perforation. The crenellations extend the surface distance between the opening 30 and the periphery of the grommet and thus extend the creepage distance between the electrical conductor and the outer sheet. They are preferably concentric. Thanks to the crenellations engraved in the lower part, the electrical conductor emerging from the non-conductive grommet on the backside of the outer sheet is kept at a safe surface distance from the conductive metal. The non-conductive grommet can comprise another opening 30, adjacent to the first one for the passing of a second electrical conductor.

[0148]

[0054] Preferably, the thickness of the grommet is of the order or magnitude of the thickness of the outer sheet (0.5-1 mm). In particular, the grommet is less than 2 mm thick, more preferably less than 1 mm thick. Preferably, the grommet does not protrude substantially below the surface of the backside of the outer sheet, in particular of the backside of the outer central part. In particular, the grommet does not protrude over more than 1 mm below the surface of the backside of the outer sheet. In other words, the surface of the bottom part of the grommet is substantially flush with the surface of the backside of the outer sheet. Thanks to this design, the lamination of the photovoltaic active area can be efficiently performed on the outer sheet alone, without modifying existing lamination equipment to accommodate parts protruding from the surface of the backside of the outer sheet. Furthermore, the grommet has no impact on the flatness of the outer sheet.

[0149]

[0055] Preferably, the width of the grommet (i.e. the longest length measured in the X-Y plane) is of the order or magnitude of the diameter of an electrical connector, as described below. In particular, the width is inferior to 3 cm, more preferably inferior to 2 cm. Such a width further improves the quality of the lamination of the photovoltaic active area on the outer sheet.

[0150]

[0056] Preferably, the first perforation 27 is not traversed by anything other than the first electrical conductor, and the non-conductive grommet if any and a second electrical conductor if any. Preferably, the second perforation 28 is not traversed by anything other than the second electrical conductor, and the non-conductive grommet if any and another electrical conductor if any.

[0151]

[0057] With reference to Figures 8, 9, 11 , 12, 14 and 15, the outer central part 17 of the outer sheet 4 can further comprise by-pass perforations 33. The latter allow the addition of by-pass diodes 34 of the first photovoltaic active area at the backside of the outer sheet. As the by-pass diodes are thicker than the layers of the first photovoltaic active area, inserting them directly in the first photovoltaic active area tends to jeopardize the integrity of the latter. Thanks to the by-pass perforations, conductive ribbons from the first photovoltaic active area can go through the outer sheet, be connected to a by-pass diode and go through the outer sheet again.

[0152]

[0058] The by-pass perforations are preferably regularly positioned along the longitudinal direction of the first photovoltaic active area. They are preferably positioned as far as possible from the edges of the frontsheet of the photovoltaic active area, in the transverse direction, to prevent water leaks.

[0153]

[0059] Preferably, the width of the by-pass perforations (i.e. the longest length measured in the X-Y plane) is of the order of magnitude of the diameter of an electrical connector, as described below. In particular, the width is inferior to 3 cm, more preferably inferior to 2 cm. In other words, the by-pass perforations are not capable of receiving an electrical connector housing. Such a width further minimizes the negative impact a hole can have on the lam ination of the photovoltaic active area on the outer sheet alone and further improves the watertightness of the sandwich panel.

[0154]

[0060] In the case where the outer sheet is made of a conductive material, non-conductive grommets 29 are preferably inserted in the by-pass perforations to insulate the conductive ribbons from the by-pass perforations. These grommets have the same features as the ones described above except in that they comprise two openings: one for the conductive ribbon coming from the first photovoltaic active area and one for the conductive ribbon going back to the first photovoltaic active area.

[0155]

[0061] According to one variant of the invention illustrated on Figures 1 , 2, 11 -16, 20 and 21 , the sandwich panel 1 comprises a second photovoltaic active area 35 positioned on the outer central part 17. The second photovoltaic active area 35 is positioned beside the first photovoltaic active area 24. Preferably, the first photovoltaic active area and the second photovoltaic active area extend in the longitudinal axis parallel to each other. The outer sheet can comprise a third longitudinal rib positioned between the first photovoltaic active area and the second photovoltaic active area.

[0156]

[0062] The second photovoltaic active area 35 is electrically connected to a third electrical conductor 36 and to a fourth electrical conductor 37. Accordingly, the outer central part 17 can comprise a third perforation 38 through which the third electrical conductor runs. In a first variant, the fourth electrical conductor also runs through the third perforation. Alternatively, the outer central part 17 further comprises a fourth perforation 39 through which the fourth electrical conductor runs. The features and variants detailed in relation to the first photovoltaic active area and the corresponding features of the outer sheet apply here. Alternatively, the third electrical conductor and the fourth electrical conductor can run through the first perforation 27 or through the second perforation 28, if applicable. For the sake of clarity, the expression “third perforation” does not preclude the absence of a second perforation in the central outer part.

[0157]

[0063] As mentioned above in relation to the first photovoltaic active area 24, the first electrical conductor 25 and the second electrical conductor 26 go through the outer sheet 4. On the backside of the outer sheet, the first electrical conductor 25 is electrically connected, directly or indirectly, to a first cable 42 and the second electrical conductor 26 is electrically connected, directly or indirectly, to a second cable 43. The way the electrical connections are done is not limited. It can be done by welding. The first cable and second cable are preferably insulated. The first cable and second cable can comprise a sleeve, in at least one portion.

[0158]

[0064] For electrical safety reasons, and to facilitate the integration of the photovoltaic function in the sandwich panel, the first electrical conductor and the second electrical conductor are preferably insulated from the insulation material 2. In the variant illustrated on Figures 10, 13, 16, 22 and 24, the first electrical conductor is preferably connected to the first cable in a first junction box 40 and the second electrical conductor is preferably connected to the second cable in a second junction box 41 . A junction box is an electrical enclosure in which electrical wiring connections are safely made. The first junction box 40 and the second junction box 41 are part of the backside of the outer sheet 4. Both junction boxes preferably comprise a casing. The casing preferably comprises a conductor opening or ribbon opening and a cable opening. In a variant, the junction box 40, 41 comprises a non- conductive grommet 29, as described above. In another variant (not illustrated), the first and second electrical conductors are connected to respectively the first and second cables in the same junction box.

[0159]

[0065] The first junction box 40, respectively the second junction box 41 if applicable, is preferably positioned in contact with the backside of the outer sheet, substantially plumb with the first perforation 27, respectively second perforation 28, so that there is no gap between the outer sheet and the junction boxes. The junction boxes can be attached to the backside of the outer sheet, for example by gluing.

[0160]

[0066] Thanks to this configuration, the connection of the electrical conductors on the backside of the outer sheet does not jeopardize the integrity and quality of the first photovoltaic active area. Moreover, the junction box(es) can further improve the watertightness at the level of the perforations.

[0161]

[0067] The first cable 42 and second cable 43 run through the insulation material until they enter a first cavity 44.

[0162]

[0068] The portion of the cable running through the insulation can comprise a sleeve. By Tun through the insulation material”, it is meant that the cable, possibly comprising a sleeve, is closely surrounded by the insulation material. It is the result of the laying of the insulation after the cable has been positioned.

[0163]

[0069] Each cable, possibly comprising a sleeve, is preferably substantially embedded in the insulation material between the first cavity and its respective electrical conductor, or respective junction box if applicable. In other words, this portion of the cable is irremovable. The substantial embedment of this portion of cables in the insulation material is the result of the foaming of the insulation material around the cable or the result of the attachment of the cable to the insulation material, for example by gluing, when the insulation is laid. This substantial embedment facilitates the process for manufacturing the sandwich panel since no specific step has to be performed to isolate this portion of the cables from the insulation material before the latter is put in place.

[0164]

[0070] With reference to figure 18, in the first cavity 44, each cable is connected to an electrical connector. The first cable is connected to a first electrical connector 46 and the second cable is connected to a second electrical connector 47. The first electrical connector and second electrical connector are corresponding male and female connectors. The first electrical connector can be the male connector and the second electrical connector the female connector or vice versa.

[0165]

[0071] These electrical connectors allow the electrical connection of the first photovoltaic active area to other photovoltaic active areas and / or to the grid. In particular, one polarity of the first photovoltaic active area can be connected to one polarity of a first photovoltaic active area of a second sandwich panel positioned adjacent to one side of insulation material of the first sandwich panel, by connecting, directly or indirectly, the first electrical connector 46 of the sandwich panel to the second electrical connector 47 of the second sandwich panel. Similarly, the other polarity of the first photovoltaic active area can be connected to one polarity of a first photovoltaic active area of a third sandwich panel positioned adjacent to another side of insulation material of the first sandwich panel, by connecting, directly or indirectly, the second electrical connector 47 of the sandwich panel to the first electrical connector 46 of the third sandwich panel. Alternatively, the first electrical connector 46 or the second electrical connector 47 of the sandwich panel can be connected to the grid. The role and features of the cavity will be detailed later on.

[0166]

[0072] With reference to Figures 11 to 13, according to the variant of the invention in which the sandwich panel 1 comprises a second photovoltaic active area 35 positioned on the outer central part 17 and according to a first embodiment of the wiring, the backside of the outer sheet 4 comprises a third cable 50 connected to the third electrical conductor 36 and a fourth cable 51 connected to the fourth electrical conductor 37. In the variant illustrated, the third cable 50 is connected to the third electrical conductor 36 in a third junction box 48 and the fourth cable 51 is connected to the fourth electrical conductor 37 in a fourth junction box 49. The features and variants detailed in relation to the first and second junction boxes apply here. Alternatively, the third and fourth cables are connected to respectively the third electrical conductor and the fourth electrical conductor in the same junction box, which can possibly be the first junction box 40.

[0167]

[0073] In this first embodiment of the wiring, the third cable 50 and the fourth cable 51 run through the insulation material until they both enter the first cavity 44 along the first and second cables, as illustrated on Figure 20, or both enter a second cavity 45, as illustrated on Figures 13 and 21. Each cable, possibly comprising a sleeve, is preferably substantially embedded in the insulation material between its respective cavity and its respective electrical conductor, or respective junction box if applicable. The cable is preferably insulated for that purpose. In their cavity, each of the third and fourth cables is connected to an electrical connector. The third cable is connected to a third electrical connector 52 and the fourth cable is connected to a fourth electrical connector 53. The third electrical connector and fourth electrical connector are corresponding male and female connectors. The third electrical connector can be the male connector and the fourth electrical connector the female connector or vice versa.

[0168]

[0074] These electrical connectors allow the electrical connection of the second photovoltaic active area to other photovoltaic active areas and / or to the grid. In particular, one polarity of the second photovoltaic active area can be connected to one polarity of a photovoltaic active area of a second sandwich panel positioned adjacent to one side of insulation material of the first sandwich panel by connecting, directly or indirectly, the fourth electrical connector 53 of the sandwich panel to the first electrical connector 46 of the second sandwich panel. Similarly, the other polarity of the second photovoltaic active area can be connected to one polarity of the first photovoltaic area by connecting, directly or indirectly, the third electrical connector 52 to the second electrical connector 47. Alternatively, the other polarity of the second photovoltaic active area can be connected to one polarity of a photovoltaic active area of a third sandwich panel adjacent to another side of insulation material of the first sandwich panel by connecting, directly or indirectly, the third electrical connector 53 of the sandwich panel to the second electrical connector 47 or fourth electrical connector 53 of the third sandwich panel. Alternatively, the third electrical connector 52 or the fourth electrical connector 53 of the sandwich panel can be connected to the grid.

[0169]

[0075] According to a second embodiment of the wiring illustrated on Figures 14 to 16, the wiring differs from the first embodiment in that the backside of the outer sheet 4 comprises a linking cable 113 connecting the third electrical conductor 36 of the second photovoltaic active area 35 to the second electrical conductor 26 of the first photovoltaic active area 24, while the fourth electrical conductor 37 of the second photovoltaic active area is connected to the second electrical connector 47 through the second cable 43 described above. In other words, in this variant, the second electrical conductor 26 is connected to the second electrical connector 47 positioned in the first cavity 44, through consecutively:

[0170] - a linking cable 113 connecting the second electrical conductor 26 of the first photovoltaic active area 24 to the third electrical conductor 36 of the second photovoltaic active area 35,

[0171] - the second photovoltaic active area 35,

[0172] - the second cable 43 connecting the fourth electrical conductor 37 of the second photovoltaic active area 35 to the second electrical connector 47.

[0173] The second cable 43 indirectly connects the second electrical conductor 26 to the second electrical connector 47 positioned in the first cavity 44.

[0174]

[0076] In this variant, the linking cable 113 can be connected to the second electrical conductor 26 in the second junction box 41 and to the third electrical conductor 36 in a third junction box 48 and the second cable 43 can be connected to the fourth electrical conductor 37 in a fourth junction box 49. The features and variants detailed in relation to the first and second junction boxes apply here. Alternatively, the linking cable 113 can be connected to the second electrical conductor 26 and to the third electrical conductor 36 in a second junction box 41 and the second cable 43 can be connected to the fourth electrical conductor 37 in the first junction box 40.

[0175]

[0077] In this variant, in the first cavity 44, the first cable is connected to a first electrical connector 46 and the second cable is connected to a second electrical connector 47, as in the case where there is only one photovoltaic active area and as illustrated in Figure 18.

[0078] As mentioned above in relation to the electrical connectors, the sandwich panel comprises a first cavity 44 and possibly a second cavity 45. By “cavity”, it is meant a hollow space within the insulation material. This hollow space is dimensioned so that it can accommodate a first electrical connector and a portion of a first cable, and a second electrical connector and a portion of a second cable.

[0176]

[0079] For the sake of clarity, the sandwich panel does not comprise a second cavity in the other half of the sandwich panel compared to the first cavity. In particular, the sandwich panel does not comprise a second cavity designed for, and capable of, accommodating the second electrical connector separately from the first electrical connector. The sandwich panel does not comprise a second cavity in which the second electrical connector is positioned or through which the second cable runs.

[0177]

[0080] The cavity can be a substantially rectangular parallelepiped. It can extend in the longitudinal direction or in the transverse direction. The cavity preferably comprises a casing embedded in the insulation material. By “embedded”, it is meant that the casing is fixed firmly into the insulation material and intricately linked to it. This embedment is the result of the foaming of the insulation material around the casing or the result of the attachment of the casing to the insulation material, for example by gluing, when the insulation is laid. The cavity can be fully delimited by the casing. Alternatively, it can be delimited in part by the casing and in part by other components of the sandwich panel, such as, for example, the edge band 9, the cap 10, the outer sheet 4, the inner sheet 3.

[0178]

[0081] The material used for the casing is not limited. It can be, for example, plastic, a foamed material, mineral wool, wood wool. In the case of the insulation material formed by expansion of a reaction mix, the material is preferably selected so that the cavity is not significantly shrunk during the expansion of the reaction mix.

[0179]

[0082] The cavity is positioned within the insulation material. By that expression, it is meant that no single part of the cavity, and in particular no single part of its casing is outside the limits of the insulation material. In particular, no single part of the cavity protrudes from either the first longitudinal side 5 or the second longitudinal side 6, or the upper transverse side 7 or the lower transverse side 8 of the insulation material. With this configuration, the sandwich panel can be produced as a standard sandwich panel in existing production facilities.

[0180]

[0083] With reference to Figures 18, 22 and 24, the first cavity 44 comprises the first electrical connector 46 and a portion of the first cable 42. Preferably, this portion of the first cable is long enough so that the first electrical connector can be extracted from the cavity. More preferably, this portion of the first cable is folded in the first cavity. This folding eases the extraction. The first cavity 44 further comprises the second electrical connector 47 and a portion of the second cable 43. This portion is preferably folded in the first cavity. In the variant of the invention in which the sandwich panel 1 comprises a second photovoltaic active area 35 and a second cavity 45, the latter comprises the third electrical connector 52 and a portion of the third cable 50. Preferably, this portion of the third cable is long enough so that the third electrical connector can be extracted from the second cavity. More preferably, this portion of the third cable is folded in the second cavity. The second cavity 45 further comprises the fourth electrical connector 53 and a portion of the fourth cable 51. This portion is preferably folded in the second cavity. Alternatively, the first cavity comprises the third electrical connector 52 and a portion of the third cable 50 and the fourth electrical connector 53 and a portion of the fourth cable 51 , as described above.

[0181]

[0084] In order to ease the insertion of the cables in the cavity, the casing of the cavity preferably comprises an inlet for cable insertion. The casing can also comprise an outlet for accessing the electrical connectors. Alternatively, the electrical connectors can be accessed by cutting the casing of the cavity.

[0182]

[0085] The first purpose of the cavity is to prevent the electrical connectors of the photovoltaic active area(s) from being trapped in the insulation material during the manufacturing process of the sandwich panel. The second purpose is to permit an easy access to the electrical connectors during the assembling of sandwich panels and, in particular, during the electrical connection of the photovoltaic active areas of adjacent panels. Accordingly, the cavity is positioned adjacent to either one of the sides 5, 6, 7, 8 of the insulation material or the inner sheet so that it can:

[0183] - give access to the electrical connectors, possibly after being opened,

[0184] - allow the connectors to be extracted from the cavity if the portion of the cable present in the cavity is long enough to do so.

[0185]

[0086] According to a first embodiment of the cavity positioning illustrated on Figures 10, 13, 16, 18, 19, 20 and 21 , the first cavity 44 is positioned adjacent to the upper transverse side 7 of the insulation material. This way, when a sandwich panel is positioned on a building structure by interlocking the second longitudinal outer flange 16 of an adjacent panel with the first longitudinal outer flange 15 of the sandwich panel, the upper transverse side of the insulation material remains accessible to the operator, for example at the roof ridge or on a side of the fagade. The latter can thus easily open the cavity, if it has not been done at a previous step, and access the connectors to connect them to the electrical connectors of adjacent sandwich panels or to the grid. Preferably, the first cavity is positioned less than 1 cm from the upper transverse side, more preferably less than 0.5 cm. In particular, the casing of the first cavity is positioned adjacent to the upper transverse side. More particularly, a wall of the casing is positioned adjacent to the upper transverse side. It can be a plain wall or a wall comprising an outlet for accessing the electrical connectors. This wall can be in the plane of the upper transverse side. In that case, this wall and, if applicable, the outlet for accessing the electrical connectors are not in contact with the insulation material. The first cavity, in particular its casing, can be adjacent to the cap 10.

[0186]

[0087] In this embodiment, the first cavity can be open along the upper transverse side 7 of the insulation material, possibly through a cut in the insulation material and / or through a cut in the cap 10 and / or through a cut in the casing of the cavity.

[0187]

[0088] According to a second embodiment of the cavity positioning (not illustrated), the first cavity 44 is positioned adjacent to the lower transverse side 8 of the insulation material. This way, when a sandwich panel is positioned on a building structure by interlocking the second longitudinal outer flange 16 of an adjacent panel with the first longitudinal outer flange 15 of the sandwich panel, the lower transverse side of the insulation material remains accessible to the operator, for example at the roof gutter or on a side of the fagade. The latter can thus easily open the cavity, if it has not been done at a previous step, and access the connectors to connect them to the electrical connectors of adjacent sandwich panels or to the grid. Preferably, the first cavity is positioned less than 1 cm from the lower transverse side, more preferably less than 0.5 cm. In particular, the casing of the first cavity is positioned adjacent to the lower transverse side. More particularly, a wall of the casing is positioned adjacent to the lower transverse side. It can be a plain wall or a wall comprising an outlet for accessing the electrical connectors. This wall can be in the plane of the lower transverse side. In that case, this wall and, if applicable, the outlet for accessing the electrical connectors are not in contact with the insulation material. The first cavity, in particular its casing, can be adjacent to the cap 10.

[0188]

[0089] In this embodiment, the first cavity can be open along the lower transverse side 8 of the insulation material, possibly through a cut in the insulation material and / or through a cut in the cap 10 and / or through a cut in the casing of the cavity.

[0189]

[0090] According to a third embodiment of the cavity positioning illustrated on Figures 22 and 23, the first cavity 44 is positioned adjacent to the second longitudinal side 6 of the insulation material. Preferably, the first cavity is positioned less than 1 cm from the second longitudinal side, more preferably less than 0.5 cm. In particular, the casing of the first cavity is positioned adjacent to the second longitudinal side. More particularly, a wall of the casing is positioned adjacent to the second longitudinal side. It can be a plain wall or a wall comprising an outlet for accessing the electrical connectors. This wall can be in the plane of the second longitudinal side. In that case, this wall and, if applicable, the outlet for accessing the electrical connectors are not in contact with the insulation material. The first cavity, in particular its casing, can be adjacent to the edge band 9.

[0091] In this embodiment, the first cavity can be open along the second longitudinal side 6 of the insulation material, possibly through a cut in the insulation material and / or through a cut in the edge band 9 and / or through a cut in the casing of the cavity.

[0190]

[0092] In this embodiment, when the electrical connectors with a portion of cable are extracted from the first cavity or when additional cables are connected to the electrical connectors, the cables should not prevent the sandwich panels from being assembled contiguously. Consequently, the second longitudinal side of the insulation material can comprise a first cutout 54 extending from the first cavity to the closest transverse side 7, 8, so that the cables can run in the first cutout. This way, when a sandwich panel is positioned on a building structure by interlocking the second longitudinal outer flange 16 of an adjacent panel with the first longitudinal outer flange 15 of the sandwich panel, the second longitudinal side of the insulation material remains accessible to the operator. The latter can thus easily open the cavity, if it has not been done at a previous step, and access the cables to run them in the first cutout, before the second longitudinal outer flange is interlocked with the first longitudinal outer flange 15 of an adjacent sandwich panel.

[0191]

[0093] According to a fourth embodiment of the cavity positioning (not illustrated), the first cavity 44 is positioned adjacent to the first longitudinal side 5 of the insulation material. Preferably, the first cavity is positioned less than 1 cm from the first longitudinal side, more preferably less than 0.5 cm. In particular, the casing of the first cavity is positioned adjacent to the first longitudinal side. More particularly, a wall of the casing is positioned adjacent to the first longitudinal side. It can be a plain wall or a wall comprising an outlet for accessing the electrical connectors. This wall can be in the plane of the second longitudinal side. In that case, this wall and, if applicable, the outlet for accessing the electrical connectors are not in contact with the insulation material. The first cavity, in particular its casing, can be adjacent to the edge band 9.

[0192]

[0094] In this embodiment, the first cavity can be open along the first longitudinal side 5 of the insulation material, possibly through a cut in the insulation material and / or through a cut in the edge band 9 and / or through a cut in the casing of the cavity.

[0193]

[0095] In this embodiment, when the electrical connectors with a portion of cable are extracted from the first cavity or when additional cables are connected to the electrical connectors, the cables should not prevent the sandwich panels from being assembled contiguously. Consequently, the first longitudinal side of the insulation material can comprise a first cutout 54 extending from the first cavity to the closest transverse side 7, 8, so that the cables can run in the first cutout. This way, when a sandwich panel is positioned on a building structure by interlocking the first longitudinal outer flange 15 of an adjacent panel with the second longitudinal outer flange 16 of the sandwich panel, the first longitudinal side of the insulation material remains accessible to the operator. The latter can thus easily open the cavity, if it has not been done at a previous step, and access the cables to run them in the first cutout, before the first longitudinal outer flange is interlocked with the second longitudinal outer flange 16 of an adjacent sandwich panel.

[0194]

[0096] According to a fifth embodiment of the cavity positioning illustrated on Figures 24, 25 and 26, the first cavity 44 is positioned adjacent to the inner sheet 3, in particular to the backside of the inner sheet. This way, when a sandwich panel is positioned on a building structure, the cables can be accessed from the inner sheet and the electrical connections can be done from the inside of the building. Preferably, the first cavity is positioned less than 1 cm from the inner sheet, more preferably less than 0.5 cm. In particular, the casing of the first cavity is positioned adjacent to the inner sheet. More particularly, a wall of the casing is positioned adjacent to the inner sheet. It can be a plain wall or a wall comprising an outlet for accessing the electrical connectors. This wall can be in contact with the inner sheet. Preferably, the first cavity is positioned along the longitudinal axis X of the sandwich panel between the first perforation and the closest transverse side 7, 8 of the insulation material. This position facilitates the access to the cables from the transverse side. Alternatively, the first cavity can be positioned adjacent to the first and / or second junction box or even plumb with the junction box. According to a variant of the invention, the junction box(es) is inside the first cavity, by being for example integrated in the cavity casing. It eases the installation of the electrical components on the backside of the outer sheet since the junction box(es) and the cavity can be installed at once. The first and second cables and the first and second electrical connectors can even be pre-installed in the first cavity, before the latter is positioned on the backside of the outer sheet.

[0195]

[0097] In this embodiment, the first cavity 44 adjacent to the inner sheet 3 can be open along the inner sheet 3, for example with a first hole 55 in the inner sheet, possibly through a cut in the insulation material and / or through a cut in the casing of the cavity.

[0196]

[0098] For all five embodiments of the cavity positioning, in the variant of the invention in which the sandwich panel 1 comprises a second photovoltaic active area 35 and a second cavity 45, the latter is positioned adjacent to either one of the sides 5, 6, 7, 8 of the insulation material or the inner sheet, as detailed in the five above-described embodiments of the position of the first cavity. In particular, the first cavity and the second cavity are positioned the same way, as illustrated on Figures 21 and 26. In the case of the third and fourth embodiments of the cavity positioning, the first cutout 54 in the longitudinal side can be adapted for running all the cables. In the case of the fifth embodiment of the cavity positioning, the second cavity adjacent to the inner sheet can be open along the inner sheet, for example with a second hole 57.

[0197]

[0099] With reference to Figures 3 to 7, the sandwich panel 1 further comprises an inner sheet 3. It is a sheet of substantially rectangular shape, comprising a first longitudinal inner edge 61 , a second longitudinal inner edge 62, an upper transverse inner edge 63, a lower transverse inner edge 64.

[0198]

[0100] As illustrated on Figures 5, 6 and 7, a first longitudinal inner flange 65 runs along the first longitudinal inner edge 61 and a second longitudinal inner flange 66 runs along the second longitudinal inner edge 62. The first longitudinal inner flange 65 and the second longitudinal inner flange 66 are connected by an inner central part 67. The latter has a first longitudinal extremity 83 and a second longitudinal extremity 84.

[0101] According to a first embodiment of the inner central part illustrated on Figure 6, the later substantially lies down flat in plane P. According to a second embodiment of the inner central part illustrated on Figures 5 and 7, the inner central part comprises longitudinal stiffeners to increase the stiffness of the metallic sheet.

[0199]

[0102] According to a third embodiment of the inner central part, the inner central part 67 is shaped to allow the routing of cables along the inner sheet, in particular the routing of a part of the first cable 42 with the first electrical connector 46 and a part of the second cable 43 with the second electrical connector 47 and, if applicable, of a part of the third cable 50 with the third electrical connector 52 and a part of the fourth cable 51 with the fourth electrical connector 53. For that reason, the inner central part can comprise a groove. The groove has preferably a trapezoidal shape with a top central part and two lateral wings. This shape facilitates the profiling of the inner sheet.

[0200]

[0103] The groove is dimensioned so that portions of the cables with electrical connectors can be routed in the groove. In particular, the height (taken along the Z axis) of the groove is superior or equal to the diameter of the electrical connector. More particularly, the width (taken along the Y axis) of the groove is superior or equal to the diameter of the electrical connector. Even more particularly, the width of the groove is superior or equal to two times the diameter of the electrical connector. In one variant, the height (taken along the Z axis) of the lateral wings of the groove is superior or equal to the diameter of the electrical connector. In another variant, the width (taken along the Y axis) of the top central part 86 of the groove is superior or equal to the diameter of the electrical connector.

[0201]

[0104] In a first variant of this embodiment illustrated on Figures 25 and 26, the inner central part comprises a first groove 59 extending at least from the first hole 55 in the inner central part to the closest transverse side 7, 8 of the insulation material. If applicable, the inner central part comprises a second groove 60 extending at least from the second hole 57 in the inner central part to the closest transverse side 7, 8 of the insulation material.

[0105] In a second variant (not illustrated), the inner central part comprises a longitudinal groove extending from the upper transverse inner edge 63 to the lower transverse inner edge 64 of the inner sheet, i.e. from the upper transverse side 7 to the lower transverse side 8 of the insulation material. The first hole 55, and the second hole 57 if applicable, is positioned in the longitudinal groove, preferably on a lateral wing of the longitudinal groove.

[0202]

[0106] In a third variant (not illustrated), the inner central part comprises a transverse groove extending from the first longitudinal inner edge 61 to the second longitudinal inner edge 62 of the inner sheet, i.e. from the first longitudinal side 5 to the second longitudinal side 6 of the insulation material. The first hole 55, and the second hole 57 if applicable, is positioned in the transverse groove, preferably on a lateral wing of the transverse groove.

[0203]

[0107] According to a first embodiment of the longitudinal inner flanges illustrated on Figures 5 and 7, in cross-section perpendicular to the longitudinal axis X, the first longitudinal inner flange 65 extends inwards from the first longitudinal extremity of the inner central part 67 and forms an inner edge rabbet 68 in the insulation material along the first longitudinal side 5 of the insulation material. Preferably, the inner edge rabbet comprises, successively and starting from the first longitudinal extremity of the inner central part, a first inner riser 69 and a top portion 70. The first inner riser is preferably substantially flat. It can comprise a longitudinal embossing for the easy clipping of a capping. It preferably extends substantially perpendicular to the inner central part, i.e. perpendicular to plane P, or can be inclined towards the top portion. The latter can be parallel to plane P or slightly inclined towards the inner central part to facilitate the interlocking of two adjacent panels.

[0204]

[0108] Preferably the first longitudinal inner flange 65 further comprises a first inner stiffener 71 extending from the inner edge rabbet 68, in particular from the top portion 70. According to one variant of the invention, the first inner stiffener extends substantially perpendicularly to the inner central part along the first longitudinal side 5 of the insulation material. It improves the sealing between two panels.

[0109] The first longitudinal inner flange 65 is preferably on the same longitudinal side of the insulation material as the first longitudinal rib of the outer sheet, which projects from the longitudinal side of the insulation material, as illustrated on Figure 5. It facilitates the lateral assembling of two adjacent panels. More preferably, the first longitudinal inner edge 61 is substantially plumb with the first longitudinal extremity of the outer central part 17 of the outer sheet 4. In other words, the inner edge rabbet 68 is positioned underneath the outer central part 17 of the outer sheet 4.

[0205]

[0110] According to a first variant of the first embodiment illustrated on Figure 5, the second longitudinal inner flange 66 extends from the second longitudinal extremity 84 of the inner central part 67 and comprises a second inner riser 72 extending inwards from this second longitudinal extremity 84. The second inner riser is preferably substantially flat. It can comprise a longitudinal embossing for the easy clipping of a capping. It preferably extends substantially perpendicular to plane P.

[0206]

[0111] The second longitudinal inner flange 66 further comprises a bearing area, extending from the second inner riser 72, in the form of an inner indent 81 extending substantially parallel to plane P and inwards.

[0207]

[0112] Preferably, the inner indent 81 is in the form of a substantially flat ledge projecting from the portion of the second longitudinal side 6 of the insulation material situated between the inner sheet and the outer sheet. In other words, the second longitudinal side of the insulation preferably comprises a substantially vertical portion positioned between the outer sheet and the inner sheet, then a ledge projecting from this portion and covered by the inner indent 81 , and then a substantially vertical portion covered by the second inner riser 72.

[0208]

[0113] Preferably the second longitudinal inner flange 66 comprises a second inner stiffener 77 extending from the inner indent 81 . According to one variant of the invention, the second inner stiffener extends substantially perpendicularly to the inner central part 67 along the second longitudinal side 6 of the insulation material. It improves the sealing between two panels.

[0209]

[0114] According to a second variant of the first embodiment illustrated on Figure 7, the second longitudinal inner flange 66 differs from the first variant in that the bearing area, extending from the second inner riser 72, is in the form of an inner tongue 73 extending substantially parallel to plane P and outwards.

[0210]

[0115] Preferably, the inner tongue 73 projects from the second longitudinal side 6 of the insulation material. In other words, the inner tongue extends beyond the second longitudinal side of the insulation material. Preferably, the inner tongue is in the form of a U-shaped bend comprising a lower branch 74 and an upper branch 75 linked by a U-turn 76. More preferably, the branches 74 and 75 are parallel. More preferably, the radius of the U-turn is such that the space in-between the branches is filled with insulation material 2 which helps stiffening the inner tongue. According to another variant, the radius of the U-turn is such that the two branches are in contact with each other.

[0211]

[0116] Preferably the second longitudinal inner flange 66 comprises a second inner stiffener 77 extending from the inner tongue 73, in particular from the upper branch 75. According to one variant of the invention, the second inner stiffener extends substantially perpendicularly to the inner central part 67 along the second longitudinal side 6 of the insulation material. It improves the sealing between two panels.

[0212]

[0117] In both variants, the first longitudinal inner flange 65 and the second longitudinal inner flange 66 have shapes that allow the overlapping of one on the other, i.e. their interlocking, when one sandwich panel is assembled with a sandwich panel laterally adjacent. Preferably, their shapes are substantially complementary and their dimensions are such that:

[0213] - The height of the inner edge rabbet (measured along the vertical axis Z) is superior to the height of the second inner riser,

[0214] - The width of the inner edge rabbet (measured along the transversal axis Y) is superior or equal to the width of the bearing area (inner tongue 73 or inner indent 81 ).

[0215]

[0118] In particular, the first longitudinal inner flange 65 and the second longitudinal inner flange 66 can have shapes that allow them to form a technical recess when two sandwich panel laterally adjacent are assembled. In particular, it is formed when the second longitudinal outer flange 16 of a first sandwich panel is interlocked with the first longitudinal outer flange 15 of a second sandwich panel laterally adjacent.

[0216]

[0119] The second inner riser 72 of the first sandwich panel and the inner edge rabbet 68 of the second sandwich panel form the technical recess. In particular, the technical recess is delimited by the second inner riser 72 of the first sandwich panel, the inner edge rabbet 68, at least in part, of the second sandwich panel and the plane P. More particularly, in the case of an inner tongue 73, the technical recess is delimited by the plane P and, as for the first sandwich panel, by the second inner riser 72 and the lower branch 74 of the inner tongue and, as for the second sandwich panel, by the part of the top portion 70 not covered by the inner tongue and the first inner riser 69. More particularly, in the case of an inner indent 81 , the technical recess is delimited by the plane P and, as for the first sandwich panel, by the second inner riser 72 and, as for the second sandwich panel, by the first inner riser 69 and the part of the top portion 70 not covering the inner indent 81 .

[0217]

[0120] As the technical recess is open to the inside of the building, it can be used to route cables, in particular to route a part of the first cable 42 with the first electrical connector 46 and a part of the second cable 43 with the second electrical connector 47 and, if applicable, a part of the third cable 50 with the third electrical connector 52 and a part of the fourth cable 51 with the fourth electrical connector 53. It can also be used to fix equipment, such as lightning. The technical recess can also be closed with a decorative capping and / or a fireproof capping.

[0218]

[0121] Such overlapping of the inner edge rabbet and the bearing area improves the watertightness, airtightness and mechanical resistance of the envelope made of sandwich panels.

[0219]

[0122] In a second embodiment of the longitudinal inner flanges illustrated on Figure 6, in cross-section perpendicular to the longitudinal axis X, the first longitudinal inner flange 65 comprises an inner mortise 110 extending inwards. In the example illustrated, the inner mortise is in the form of a U- shaped bend extending substantially in parallel to plane P. In particular, the inner mortise comprises two branches substantially parallel and linked by a U-turn. More preferably, the two branches have substantially the same length. Other designs of inner mortise are possible. It can notably have a V- shape with two branches converging towards a U-turn. It can also have a L- shape with a branch and a seat.

[0220]

[0123] The first longitudinal inner flange 65 can comprise a first inner riser 69 extending between the first longitudinal extremity 83 of the inner central part and the inner mortise. The first inner riser can extend substantially perpendicular to the inner central part, i.e. perpendicular to plane P, or can be inclined towards the inner mortise.

[0221]

[0124] Preferably the first longitudinal inner flange 65 further comprises a first inner stiffener 71 extending from the inner mortise. According to one variant of the invention, the first inner stiffener extends substantially perpendicularly to the inner central part along the first longitudinal side 5 of the insulation material. It improves the sealing between two panels.

[0222]

[0125] The inner mortise 110 is preferably on the same longitudinal side of the insulation material as the outer mortise 102 of the outer sheet, as illustrated on Figure 6. It facilitates the lateral assembling of two adjacent panels. More preferably, the inner mortise is substantially plumb with the outer mortise.

[0223]

[0126] In accordance with the inner mortise, the second longitudinal inner flange 66 of the inner sheet comprises an inner tenon 111 extending outwards, the inner tenon and the inner mortise having shapes that allow the overlapping of one longitudinal inner flange on the other, i.e. the interlocking of the inner tenon and the inner mortise. In the example illustrated, the inner tenon projects from the second longitudinal side 6 of the insulation material. By “projects”, it is meant that the second longitudinal inner flange extends beyond the second longitudinal side of the insulation material, in particular beyond the plane of the second longitudinal side.

[0224]

[0127] In the example illustrated, the inner tenon 111 is in the form of a U- shaped bend extending substantially in parallel to the inner central part 67. In particular, the inner tenon comprises two branches substantially parallel and linked by a U-turn. More preferably, the two parallel branches have substantially the same length. Other designs of inner tenon are possible. It can notably have a V-shape with two branches converging towards a U-turn. It can also have a L-shape with a branch and a seat.

[0225]

[0128] The second longitudinal inner flange 66 can comprise a second inner riser 72 extending between the second longitudinal extremity 84 of the inner central part and the inner tenon. The second inner riser can extend substantially perpendicular to the inner central part, i.e. perpendicular to plane P, or can be inclined towards the inner tenon, or can be inclined towards the inner central part.

[0226]

[0129] Preferably the second longitudinal inner flange 66 comprises a second inner stiffener 77 extending from the inner tenon 111. According to one variant of the invention, the second inner stiffener extends substantially perpendicularly to the inner central part 67 along the second longitudinal side 6 of the insulation material. It improves the sealing between two panels.

[0227]

[0130] The inner mortise 110 and the inner tenon 111 have shapes that allow their interlocking when one sandwich panel is assembled with a sandwich panel laterally adjacent. Preferably, their shapes are substantially complementary and their dimensions are such that:

[0228] - The height of the inner mortise (measured along the vertical axis Z) is superior to the height of the inner tenon,

[0229] - The width of the inner mortise (measured along the transversal axis Y) is superior or equal to the width of the inner tenon.

[0230]

[0131] Such interlocking of the inner mortise and the inner tenon improves the resistance, notably to wind suction, of the envelope made of sandwich panels.

[0231]

[0132] In all three embodiments of the longitudinal inner flanges described above, the shapes of the first longitudinal inner flange 65 and second longitudinal inner flange 66 can be inverted.

[0232]

[0133] The embodiments of the longitudinal inner flanges and the embodiments of the inner central part can be combined. Any combination of an embodiment of the longitudinal inner flanges and an embodiment of the inner central part can be combined with any embodiment of the outer sheet.

[0134] From a manufacturing process perspective, there are mainly three ways of producing sandwich panels.

[0233]

[0135] The first way is a discontinuous process in which the inner sheet and the outer sheet are first cut to size and shaped (or vice versa). In a first variant, they are then maintained in a mold at a given distance from each other and the gap between them is filled with a reaction mix that expands to form the insulation material. In a second variant, one of the sheets is positioned in a mold and covered by the insulation material, preferably in the form of slabs, also known as batts or lamellas. A layer of adhesive is applied between the sheet and the slabs of insulation material and another layer of adhesive is applied on the insulation material. Then the second sheet is positioned on the insulation material and the stack is pressed and heated to cure the adhesive.

[0234]

[0136] The second way is a continuous process in which an inner facing and an outer facing are provided in the form of coils. The coils are wound off and the strips go, one above the other, through profiling stations where they are shaped. In a first variant, a reaction mix is then applied to the inside face of the lower strip or to the inside face of the upper strip and the two strips enter a double-belt conveyor. The latter comprises two continuous conveyor belts aligned one above the other, running parallel to one another and capable of absorbing or applying a certain amount of pressure to maintain the gap between the two strips. The gap between the two belts is adjustable, allowing the thickness of the panels to be adjusted. In the double-belt conveyor, the reaction mix expands and fills the gap between the two strips to form the insulation material. A side wall prevents lateral escape of the foam. Different panel designs and operating modes require an appropriate side seal in each case. The side wall can be in the form of an accompanying side sealing chain made of blocks. After the composite formed from the two strips and the insulation material has left the double-belt conveyor, the composite is cut to the desired length to obtain sandwich panels. In a second variant, a layer of adhesive is applied to the inside face of the lower strip and slabs of insulation material are positioned. Another layer of adhesive is applied on the insulation material or on the inside face of the upper strip. In the double-belt conveyor, the strips are pressed and the adhesive is cured. The other features of the first variant apply to the second variant.

[0235]

[0137] The third way is a semi-continuous process. It differs from the continuous process in that only the inner facing is supplied in the form of a coil and enters the double-belt conveyor as a strip, in this case as the inner strip, preferably as the higher strip on the manufacturing line. The outer facing is in the form of sheets cut to size and shaped (or vice versa) at a previous step. The outer sheets are fed continuously, with no gaps, in the manufacturing line, preferably in place of the lower strip. Then, in the first variant, the reaction mix is applied to the inside face of the outer sheets or to the inside face of the upper strip and the inner strip and the outer sheets enter the double-belt conveyor. In the conveyor, the reaction mix reacts and expands to fill the gap between the inner strip and the outer sheets and thus forms the insulation material. In the second variant, the layers of adhesive are applied and the slabs of insulation material are positioned on the outer sheets and, then, the inner strip and the outer sheets enter the double-belt conveyor where they are pressed. At the exit of the conveyor, the inner strip and the insulation material are cut depending on the length of the outer sheets to obtain sandwich panels.

[0236]

[0138] The manufacture of the sandwich panel according to the invention will be described in relation to the discontinuous process and the semi- continuous process but the person skilled in the art can easily adapt other manufacturing methods of sandwich panels to manufacture the sandwich panel according to the invention.

[0237]

[0139] At a first stage, the outer sheet 4 is prepared.

[0238]

[0140] In a first step, the outer sheet is cut to length. Optionally, it is cut to length from a strip and then shaped or the strip is first shaped on a profiling line and then cut to length. The shaping step comprises the forming of the first longitudinal outer flange 15 and of the second longitudinal outer flange 16.

[0239]

[0141] In a second step, anterior to or concomitant with or posterior to the first step, a first perforation 27 is done in the outer central part 17. If applicable, a second perforation 28 and / or a third perforation 38 and / or a fourth perforation 39 and / or by-pass perforations 33 are also done in the outer central part. Optionally, non-conductive grommets are positioned in, and possibly attached to, the perforation(s).

[0240]

[0142] In a third step, posterior to the first and second steps, a first photovoltaic active area 24 is positioned on the outer central part and preferably laminated. If applicable, a second photovoltaic active area 35 is also positioned on the outer central part at the same time and preferably laminated. In particular, positioning the photovoltaic active area comprises stacking the different components of the photovoltaic active area. In particular, during the positioning step, a first electrical conductor 25 is inserted in the first perforation and a second electrical conductor 26 is inserted either in the first perforation or in the second perforation. More particularly, non-conductive grommets 29 are inserted in the first perforation and, if applicable, second perforation. If applicable, a third electrical conductor 36 is inserted in either the first or the second or the third perforation and a fourth electrical conductor 37 is inserted in either the first or the second or the third or the fourth perforation. Once the stack has been prepared, it is heated and pressed in a lamination device so that the films surrounding the solar cells fuse and embed the cells. At the end of this step, if the outer sheet has not been previously shaped, it is done so.

[0241]

[0143] When the photovoltaic active area is laminated on the outer sheet, the latter does not comprise any part substantially protruding from the surface of the backside of the outer sheet, in particular from the surface of the backside of the outer central part. In particular, there is no part protruding over more than 2 mm below the surface of the backside of the outer sheet, or below the surface of the backside of the outer central part, more preferably over more than 1 mm. In other words, the surface of the backside of the outer central part, or the surface of the backside of the outer sheet, is substantially flat. Thanks to this design, the lamination of the photovoltaic active area can be efficiently performed on the outer sheet alone, without modifying existing lamination equipment to accommodate parts protruding from the surface of the backside of the outer sheet.

[0144] In a fourth step, posterior to the third step, the outer sheet is positioned upside down and its backside is equipped with a first cable 42, a first electrical connector 46, a second cable 43, a second electrical connector 47 and a first cavity 44, as illustrated on Figures 10, 13 and 16. Optionally, it is also equipped with a first junction box 40, a second junction box 41 and / or bypass diodes. If applicable, it is further equipped with a third cable 50, a third electrical connector 52, a fourth cable 51 and a fourth electrical connector 53 and / or by-pass diodes, as illustrated on Figure 13. Optionally, it is also equipped with a third junction box 48, a fourth junction box 49, a second cavity 45 and / or by-pass diodes. The junction boxes are preferably positioned substantially plumb with the perforations. The electrical conductors are electrically connected to one end of a cable, possibly inside the junction boxes. The other end of the cables is inserted in a cavity and electrically connected to an electrical connector (or vice versa).

[0242]

[0145] The first cavity, and the second cavity if applicable, is positioned on the backside of the outer sheet. The cavity is preferably attached, directly or indirectly, to the backside of the outer sheet.

[0243]

[0146] According to the first embodiment of the cavity positioning, the first cavity, and possibly the second cavity, is positioned along the upper transverse outer edge 13. This way, at the end of the manufacturing process, the cavity is adjacent to the upper transverse side of the insulation material. The cavity, in particular its casing, can be directed attached, for example by gluing, to the backside of the outer sheet or it can be attached to one shim 82 or a plurality of shims, themselves attached to the backside of the outer sheet, as illustrated on Figure 18. With the shim(s), the position along the vertical axis Z of the cavity in the insulation material can be adjusted, depending on the thickness of the insulation material. As an alternative to the attachment to the backside of the outer sheet, in the discontinuous process, the cavity can be attached to a cap 10 prepositioned, previously or concomitantly, along the upper transverse outer edge 13. It facilitates the positioning of the cavity along the cap during the laying of the insulation.

[0244]

[0147] According to the second embodiment of the cavity positioning, the first cavity, and possibly the second cavity, is positioned either along the lower transverse outer edge 14, or adjacent to the lower overlap area 22 if applicable, so that, at the end of the manufacturing process, the cavity is adjacent to the lower transverse side of the insulation material. The features and variants detailed above for the first embodiment of the cavity positioning apply to the second embodiment.

[0245]

[0148] According to the third embodiment of the cavity positioning, the first cavity, and possibly the second cavity, is positioned along the second longitudinal outer flange 16. This way, at the end of the manufacturing process, the cavity is adjacent to the second longitudinal side of the insulation material. The cavity, in particular its casing, can be directed attached, for example by gluing, to the backside of the outer sheet or it can be attached to one shim 82 or a plurality of shims, themselves attached to the backside of the outer sheet, as described above. With the shim(s), the position along the vertical axis Z of the cavity in the insulation material can be adjusted, depending on the thickness of the insulation material. The shim(s) can also facilitate the positioning of the cavity on the second longitudinal outer flange. As an alternative to the attachment to the backside of the outer sheet, in the discontinuous process, the cavity can be attached to an edge band 9 prepositioned, previously or concomitantly, along the second longitudinal outer flange 16. It facilitates the positioning of the cavity along the edge band during the laying of the insulation.

[0246]

[0149] According to the fourth embodiment of the cavity positioning, the first cavity, and possibly the second cavity, is positioned along the first longitudinal outer flange 15. This way, at the end of the manufacturing process, the cavity is adjacent to the first longitudinal side of the insulation material. The features and variants detailed above for the third embodiment of the cavity positioning apply to the fourth embodiment.

[0247]

[0150] According to the fifth embodiment of the cavity positioning, the first cavity, and possibly the second cavity, is positioned on the backside of the outer sheet so that, at the end of the manufacturing process, the cavity is adjacent to the inner sheet. To do so, the first cavity and possibly the second cavity, is preferably positioned on shims 82. The shim thickness (taken along the vertical axis Z) can be adjusted so that the sum of the shim thickness and the cavity thickness equal the thickness of the insulation material of the sandwich panel. Alternatively, the cavity can have the thickness of the insulation material and is directly positioned on, and attached to, the outer sheet.

[0248]

[0151] At a second stage, posterior to the first stage, the outer sheet is provided.

[0249]

[0152] At a third stage, anterior to or concomitant with or posterior to the second stage, the inner sheet is provided. In a first variant corresponding to a discontinuous process, the inner sheet cut to size and possibly shaped is provided. In a second variant corresponding to a semi-continuous process, the inner sheet is provided in the form of a strip, possibly shaped.

[0250]

[0153] At a fourth stage, posterior to the second stage and anterior to or concomitant with or posterior to the third stage, insulation is put in place. It can be put in place in the form of a reaction mix applied on the backside of the outer sheet or injected between the inner and outer sheets or in the form of slabs of insulation material 2 applied on the backside of the outer sheet. In the case of the reaction mix, it expands to form the insulation material 2. The outer sheet is preferably positioned upside down. In that case, if it has not already been positioned upside down at the first stage, it is positioned upside down before the insulation is put in place.

[0251]

[0154] At a fifth stage, posterior to the second stage, concomitant with or posterior to the third stage, and anterior to or concomitant with or posterior to the fourth stage, the inner sheet is maintained at a given distance from the outer sheet. In particular, it is positioned so that, at the end of the manufacturing process, the first cavity, and possibly the second cavity, is either adjacent to one of the sides of the insulation material or adjacent to the inner sheet. The distance between the inner sheet and the outer sheet can be maintained in the mold, in a press or in a double-belt conveyor. The outer sheet is preferably positioned upside down. In that case, if it has not already been positioned upside down at the first stage, it is positioned upside down before the inner sheet is positioned. The given distance corresponds to the set thickness of the sandwich panel.

[0155] The fourth and fifth stages are detailed below in relation to the discontinuous process and semi-continuous process. Overall, during these two stages, insulation is put in place and the inner sheet is maintained at a given distance from the outer sheet, or vice versa.

[0252]

[0156] As for the discontinuous process, in a first variant, the outer sheet and the inner sheet are positioned in a mold at a given distance from each other. The outer sheet is preferably positioned upside down at the bottom of the mold and the inner sheet at the top of the mold. The distance between the inner sheet and the outer sheet can be adjusted with shims. The mold maintains the distance between the inner sheet and the outer sheet. Edge bands 9 are preferably added along the longitudinal sides of the mold between the inner sheet and the outer sheet, unless an edge band has already been positioned at the previous step. In other words, the edge bands are preferably positioned along the first longitudinal inner edge and the second longitudinal inner edge of the inner sheet. Caps are preferably positioned along the transverse sides of the mold, between the inner sheet and the outer sheet, unless a cap has already been positioned at the previous step. In other words, the caps are preferably positioned along the upper transverse inner edge 63 and along the lower transverse inner edge 64 of the inner sheet, between the inner sheet and the outer sheet.

[0253]

[0157] Then, a reaction mix is injected in the mold between the inner sheet and the outer sheet. The reaction mix reacts and expands to fill the gap between the inner sheet and the outer sheet and thus forms the insulation material. The expansion of the reaction mixture can be done in a press or in a conveyor, possibly a double-belt conveyor.

[0254]

[0158] In a second variant of the discontinuous process, the outer sheet is positioned upside down in a mold and slabs of insulation material 2 are positioned on the outer sheet. A layer of adhesive is applied between the outer sheet and the slabs of insulation material and another layer of adhesive is applied on the insulation material. Edge bands 9 and caps 10 can be added as described in relation to the first variant. Then the inner sheet is positioned on the insulation material and maintained at a given distance from the outer sheet. The stack is pressed and heated to cure the adhesive. The pressing and heating can be done in a press or in a conveyor, possibly a double-belt conveyor.

[0255]

[0159] As for the semi-continuous process, the inner sheet enters the doublebelt conveyor as an inner strip, possibly shaped. The inner strip is namely the higher strip on the manufacturing line. The outer sheets are fed continuously, with no gaps, in the manufacturing line. They replace the second strip on the manufacturing line, namely the lower strip. Each outer sheet is thus part of a continuous feeding of the manufacturing line.

[0256]

[0160] In a first variant of the semi-continuous process, the outer sheets are positioned upside down, if not already in that position, and the reaction mix is applied to their backside or to the backside of the inner strip. The inner strip and the outer sheets enter the double-belt conveyor where the distance between them is maintained by the double-belt conveyor. In the latter, the reaction mix reacts, expands and fills the gap between the inner strip and the outer sheet to form the insulation material. Edge bands 9 are preferably positioned along the first longitudinal inner edge and the second longitudinal inner edge of the inner sheet, unless edge bands have already been positioned at the previous step. The edge bands are preferably coils wound off in the form of strips which enter the double-belt conveyor.

[0257]

[0161] In a second variant of the semi-continuous process, the outer sheets are positioned upside down, if not already in that position, and slabs of insulation material 2 are positioned on the outer sheet. A layer of adhesive is applied between the outer sheet and the slabs of insulation material and another layer of adhesive is applied on the insulation material. Then, the inner strip and the outer sheets enter the double-belt conveyor where the distance between them is maintained by the double-belt conveyor. In the latter the stack is pressed and heated to cure the adhesive.

[0258]

[0162] Once the insulation material has been put in place, the sandwich panel manufactured through the discontinuous process can be removed from the mold. As for the semi-continuous process, at the exit of the conveyor, the inner strip and the insulation material are cut depending on the length of the outer sheets to obtain the sandwich panels.

[0163] Once a sandwich panel has been manufactured, the first cavity 44 can be opened to give access to the first electrical connector 46 and to the second electrical connector 47, and possibly to the third electrical connector 52 and to the fourth electrical connector 53. Similarly, and if applicable, the second cavity 45 can be opened to give access to the third electrical connector 52 and to the fourth electrical connector 53. This is illustrated on Figures 19, 20, 21 , 23, 25 and 26.

[0259]

[0164] According to a first variant where the first cavity, and possibly the second cavity, is positioned adjacent to a side of the insulation material, the cavity can be opened by means of a cut in the side. Depending on the nature and position of the cavity, the cut can be done through different materials. The cut can be done in the insulation material. If the cavity comprises a casing having a plain wall adjacent to the side, the cut is done in the insulation material and in the casing. If a plain wall of the casing is in the plane of the side, there is no cut through the insulation material. If the wall of the casing in the plane of the side has already an outlet for accessing the electrical connector(s), there is no cut through the casing. If the side comprises an edge band or a cap, the cut can be done in the edge band or the cap. The cut can be done with any appropriate tool, such as, for example, a cutter, a saw or a chisel.

[0260]

[0165] According to a second variant where the first cavity, and possibly the second cavity, is positioned adjacent to the inner sheet, the cavity can be opened by means of a first hole 55 in the inner sheet, and possibly a second hole 57. In the variant where the inner sheet comprises a groove, the hole is preferably made adjacent to the groove or in the groove. Depending on the nature and position of the cavity, the cut can be done through different materials. If the cavity comprises a casing having a plain wall adjacent to the inner sheet, the cut is done in the inner sheet, in the insulation material and in the casing. If a plain wall of the casing touches the inner sheet, there is no cut through the insulation material. If the wall of the casing touching the inner sheet has already an outlet for accessing the electrical connector(s), there is no cut through the casing. The cut can be done with any appropriate tool, such as, for example, a drill.

[0166] The opening of the cavity (or cavities) can be done right after the manufacturing of the sandwich panels or later on. To limit the operations during installation of the sandwich panels on a building structure and to better control the quality of the cuts, the latter are preferably done at the manufacturing site.

[0261]

[0167] With reference to Figure 23, according to the variant where the cavity is positioned adjacent to a longitudinal side of the insulation material, once a sandwich panel has been manufactured, a first cutout 54 can be done in the longitudinal side of the insulation material. It is preferably done at the same time as the cuts for the opening of the cavity. The cutout can be done with any appropriate tool, such as, for example, a cutter, a chisel, a grooving machine.

[0262]

[0168] With reference to Figures 25 and 26, according to the variant where the cavity is positioned adjacent to the inner sheet, once a sandwich panel has been manufactured, a first groove 59, and possibly a second groove 60, can be done in the inner sheet. It is preferably done at the same time as the holes for the opening of the cavity. The groove can be done with any appropriate tool, such as, for example, a cutter, a chisel, a grooving machine.

[0263]

[0169] Once sandwich panels have been manufactured, they can be shipped to a construction site for assembling of a building envelope on a building structure. With reference to Figure 27, the process for the assembling of the building envelope comprises a first step where a first sandwich panel 1 a is fastened to the building structure. In particular, it is fastened to a purlin 58 or to a post. More particularly, in the example illustrated, the lower half of the first sandwich panel is fastened to a lower purlin 58a and the upper half of the first sandwich panel is fastened to an upper purlin 58b.

[0264]

[0170] In a second step, a second sandwich panel 1 b is positioned on the building structure, adjacent to the first sandwich panel.

[0265]

[0171] In a first variant of this second step, the second sandwich panel 1 b is positioned on the building structure, adjacent to the first sandwich panel so that, one of the longitudinal sides (5, 6) of its insulation material is adjacent to one of the longitudinal sides of the insulation material of the first sandwich panel. In other words, it is positioned so that one of its longitudinal outer flanges (15, 16) interlocks with one of the longitudinal outer flange of the first sandwich panel. In particular, it is positioned so that, either its first longitudinal side 5 is adjacent to the second longitudinal side of the first sandwich panel or its second longitudinal side 6 is adjacent to the first longitudinal side of the first sandwich panel. In other words, it is positioned so that, either its first longitudinal outer flange interlocks with the second longitudinal outer flange of the first sandwich panel or its second longitudinal outer flange interlocks with the first longitudinal outer flange of the first sandwich panel. The second sandwich panel is fastened to the building structure. In particular, it is fastened to a purlin 58 or to a post.

[0266]

[0172] In a second variant of this second step, the second sandwich panel 1 b is positioned on the building structure, adjacent to the first sandwich panel so that, one of the transverse sides (7, 8) of its insulation material is adjacent to one of the transverse sides of the insulation material of the first sandwich panel. In particular, it is positioned so that, either its upper transverse side 6 of insulation material is adjacent to the upper transverse side 6 of the insulation material of the first sandwich panel or its lower transverse side 7 of insulation material is adjacent to the lower transverse side 7 of the insulation material of the first sandwich panel. The second sandwich panel is fastened to the building structure. In particular, it is fastened to a purlin 58 or to a post.

[0267]

[0173] In a third step, the two sandwich panels are electrically connected by connecting one of the electrical connectors of the first sandwich panel to one of the electrical connectors of the second sandwich panel. In particular, one among the first electrical connector 46 and the second electrical connector 47 of the first sandwich panel is connected to the other electrical connector 46 or 47 of the second sandwich panel. In other words, either the first electrical connector 46 of the first sandwich panel is connected to the second electrical connector 47 of the second sandwich panel or the second electrical connector 47 of the first sandwich panel is connected to the first electrical connector 46 of the second sandwich panel.

[0268]

[0174] In the variant of the invention in which the sandwich panel 1 comprises a second photovoltaic active area 35 with a third electrical connector 52 and a fourth electrical connector 53, one among the first electrical connector 46 and the fourth electrical connector 53 of the first sandwich panel is connected to the other electrical connector 46 or 53 of the second sandwich panel. In other words, either the first electrical connector 46 of the first sandwich panel is connected to the fourth electrical connector 53 of the second sandwich panel or the fourth electrical connector 53 of the first sandwich panel is connected to the first electrical connector 46 of the second sandwich panel.

[0269]

[0175] This step can take place right after the fastening of the second sandwich panel. It can also take place once all the sandwich panels of a row, of the envelope side or of the envelope have been positioned and fastened. In this latter case, an electrician does not need to be present on the building structure during installation of the sandwich panels.

[0270]

[0176] According to a first variant, the electrical connector of the first sandwich panel is directly connected to the electrical connector of the second sandwich panel. In that case, the electrical connector of the first sandwich panel is extracted from its cavity. If the cavity has not been opened at a previous step, it is first opened. An electrical connector of the second sandwich panel is also extracted from its cavity. And then the two connectors are connected.

[0271]

[0177] According to a second variant, the electrical connector of the first sandwich panel is indirectly connected to the electrical connector of the second sandwich panel. In that case, the electrical connector of the first sandwich panel is left in its cavity (opened at a previous step) and the electrical connector of the second sandwich panel is left in its cavity (opened at a previous step). The electrical connector of the first sandwich panel is thus connected to the connector of the second sandwich panel with the help of an additional connection cable.

Claims

CLAIMS1 ) Sandwich panel (1 ), for building envelope, comprising an inner sheet (3), an outer sheet (4) and an insulation material (2) sandwiched between the inner sheet and the outer sheet, the insulation material having a first longitudinal side (5), a second longitudinal side (6), an upper transverse side (7) and a lower transverse side (8), the outer sheet comprising:- a first longitudinal outer flange (15),- an outer central part (17) extending from the first longitudinal outer flange, including: o either a first perforation (27) through which a first electrical conductor (25) and a second electrical conductor (26) run, o or a first perforation (27) through which a first electrical conductor (25) runs and a second perforation (28) through which a second electrical conductor (26) runs,- a first photovoltaic active area (24) positioned on the outer central part and electrically connected to the first electrical conductor and to the second electrical conductor,- a second longitudinal outer flange (16) extending from the outer central part, the first longitudinal outer flange and the second longitudinal outer flange having shapes that allow the overlapping of one on the other, the backside of the outer sheet comprising:- a first cable (42) connecting the first electrical conductor to a first electrical connector (46) positioned in a first cavity (44),- a second cable (43) connecting the second electrical conductor to a second electrical connector (47) positioned in the first cavity (44), the first electrical connector and the second electrical connector being corresponding male and female connectors, the first cavity being positioned within the insulation material and adjacent to either one of the sides (5, 6, 7, 8) of the insulation material or the inner sheet so that the electrical connectors can be accessed from the first cavity.2) Sandwich panel according to claim 1 wherein the first cavity (44) is open along one of the sides (5, 6, 7, 8) of the insulation material and / or along the inner sheet (3).3) Sandwich panel according to claim 1 wherein the first cavity (44) is open along one of the transverse sides (7, 8) of the insulation material through a cut in the insulation material and / or through a cut in a cap (10) covering the insulation material and / or through a cut in a wall of the first cavity.4) Sandwich panel according to claim 1 wherein the first cavity (44) is open along the inner sheet (3) through a first hole (55) in the inner sheet.5) Sandwich panel according to any one of the preceding claims wherein the first cavity (44) is delimited by a casing embedded in the insulation material.6) Sandwich panel according to any one of the preceding claims wherein:- the outer central part (17) further includes: o either a third perforation (38) through which a third electrical conductor (36) and a fourth electrical conductor (37) run, o or a third perforation (38) through which a third electrical conductor (36) runs and a fourth perforation (39) through which a fourth electrical conductor (37) runs,- the outer sheet (4) further comprises a second photovoltaic active area (35) positioned on the outer central part and electrically connected to the third electrical conductor and to the fourth electrical conductor, wherein the second electrical conductor (26) is connected to the second electrical connector (47) positioned in the first cavity (44), through consecutively:- a linking cable (113) connecting the second electrical conductor to the third electrical conductor,- the second photovoltaic active area,- the second cable connecting the fourth electrical conductor to the second electrical connector.7) Sandwich panel according to any one of claims 1 to 5 wherein:- the outer central part (17) further includes: o either a third perforation (38) through which a third electrical conductor (36) and a fourth electrical conductor (37) run, o or a third perforation (38) through which a third electrical conductor (36) runs and a fourth perforation (39) through which a fourth electrical conductor (37) runs,- the outer sheet (4) further comprises a second photovoltaic active area (35) positioned on the outer central part and electrically connected to the third electrical conductor and to the fourth electrical conductor,- the backside of the outer sheet further comprises: o a third cable (50) connecting the third electrical conductor to a third electrical connector (52) positioned in either the first cavity (44) or a second cavity (45), o a fourth cable (51 ) connecting the fourth electrical conductor to a fourth electrical connector (53) positioned in the same cavity as the third electrical connector, the third electrical connector and fourth electrical connector being corresponding male and female connectors.8) Sandwich panel (1 ), for building envelope, comprising an inner sheet (3), an outer sheet (4) and an insulation material (2) sandwiched between the inner sheet and the outer sheet, the insulation material having a first longitudinal side (5), a second longitudinal side (6), an upper transverse side (7) and a lower transverse side (8), the outer sheet comprising:- a first longitudinal outer flange (15),- an outer central part (17) extending from the first longitudinal outer flange, including: o either a first perforation (27) through which a first electrical conductor (25) and a second electrical conductor (26) run,o or a first perforation (27) through which a first electrical conductor (25) runs and a second perforation (28) through which a second electrical conductor (26) runs,- a first photovoltaic active area (24) positioned on the outer central part and electrically connected to the first electrical conductor and to the second electrical conductor,- a second longitudinal outer flange (16) extending from the outer central part, the first longitudinal outer flange and the second longitudinal outer flange having shapes that allow the overlapping of one on the other, the backside of the outer sheet comprising:- a first cable (42) connected to the first electrical conductor and running through at least a first cavity (44) and either a cut in one of the sides (5, 6, 7, 8) of the insulation material or a first hole (55) in the inner sheet, up to a first electrical connector (46),- a second cable (43) connected to the second electrical conductor and running through at least the first cavity (44) and either the cut in one of the sides (5, 6, 7, 8) of the insulation material or the first hole (55) in the inner sheet, up to a second electrical connector (47), the first electrical connector and the second electrical connector being corresponding male and female connectors, the first cavity being positioned within the insulation material and adjacent to either one of the sides of the insulation material or the inner sheet.9) A process for manufacturing a sandwich panel (1 ) according to any one of claims 1 to 8, comprising:- Providing an outer sheet (4) comprising: o an outer central part (17) including:■ either a first perforation (27) through which a first electrical conductor (25) and a second electrical conductor (26) run,■ or a first perforation (27) through which a first electrical conductor (25) runs and a second perforation (28) through which a second electrical conductor (26) runs,o a first photovoltaic active area (24) positioned on the outer central part and electrically connected to the first electrical conductor and to the second electrical conductor, the backside of the outer sheet comprising:■ a first cable (42) connecting the first electrical conductor to a first electrical connector (46) positioned in a first cavity (44),■ a second cable (43) connecting the second electrical conductor to a second electrical connector (47) positioned in the first cavity (44), the first electrical connector and the second electrical connector being corresponding male and female connectors, the first cavity being positioned on the backside of the outer sheet,- Providing an inner sheet (3),- Putting insulation in place,- Maintaining the inner sheet at a given distance from the outer sheet. )Process according to claim 9 wherein the inner sheet (3) is provided cut to size and shaped, wherein the outer sheet (4) and the inner sheet are positioned in a mold at the given distance from each other and wherein a reaction mix is injected in the mold between the inner sheet and the outer sheet so that the reaction mix reacts, expands to fill the gap between the inner sheet and the outer sheet and forms the insulation material (2). )Process according to claim 9 wherein the inner sheet (3) is provided in the form of an inner strip entering a double-belt conveyor of a manufacturing line, wherein the outer sheet (4) is part of a continuous feeding of the manufacturing line in outer sheets and wherein a reaction mix is applied to the backside of the outer sheet or to the backside of the inner strip so that the reaction mix reacts, expands in the double-belt conveyor to fill the gap between the inner strip and the outer sheet and forms the insulation material (2).12)Process according to any one of claims 9 to 11 further comprising opening the first cavity (44) to give access to the first electrical connector (46) and to the second electrical connector (47).13) Process according to any one of claims 9 to 12 further comprising, before providing the outer sheet (4), preparing the outer sheet according to the following steps:- the outer sheet is cut to length from a strip,- the first perforation (27) is done in the outer central part (17),- the first photovoltaic active area (24) is positioned on the outer central part,- the backside of the outer sheet is equipped with the first cable (42), the first electrical connector (46), the second cable (43), the second electrical connector (47) and the first cavity (44).14)A process for the assembling of a building envelope on a building structure, comprising:- (i) providing a first and a second sandwich panel (1 ) according to any one of claims 1 to 8,- (ii) fastening the first sandwich panel to the building structure,- (iii) positioning the second sandwich panel so that: o either one of the longitudinal sides (5, 6) of its insulation material is adjacent to one of the longitudinal sides (5, 6) of the insulation material of the first sandwich panel, o or one of the transverse sides (7, 8) of its insulation material is adjacent to one of the transverse sides (7, 8) of the insulation material of the first sandwich panel, and fastening the second sandwich panel to the building structure,- (iv) connecting one of the electrical connectors of the first sandwich panel to one of the electrical connectors of the second sandwich panel.

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