Electric line connection for establishing electric contact

Abstract

The invention relates to an electric line connection (10) with a cross-sectional transition region (11) between a flat ribbon cable (1) and a cable (2), in particular a round cable, wherein - the cross-sectional transition region (11) is equipped with an electric connection between the conductor path (1.1) of the flat ribbon cable (1) and the conductor (2.1) of the cable (2), and - the cross-sectional transition region (11) has an encapsulation (12) for electric insulation. A first sealing element (1.3) is provided on the flat ribbon cable (1), and a second sealing element (2.3) is provided on the cable (2). The first sealing element (1.3) is an adhesive tape (4) which is adhesive on both sides and is arranged on two surfaces of the flat ribbon cable (1) lying opposite each other, and the second sealing element (2.3) has one, two, or more sealing lips (2.4).

Description

[0001] Electrical cable connection for electrical contact

[0002] The invention relates to an electrical line connection with a cross-sectional transition region as well as a substrate with a functional element and a composite pane with at least one such line connection.

[0003] In laminated glass panels, which comprise at least two rigid panes and an intermediate layer connecting them, as well as electrical components, such connection points typically comprise a transition from a flat ribbon cable to a cable. The components incorporated into a laminated glass panel can include heating components, antenna elements, and flatly installed functional elements that can be electrically connected via so-called bus bars. Laminated glass panels equipped in this way are used in automobiles as windshields, rear windows, and side windows, as well as in the construction industry.

[0004] Functional elements with electrically controllable optical properties are used in the industrial production of laminated glass, for example, roof glass. The functional element is embedded in the laminated glass. During the production of the laminated glass, the functional element is cut out of a multilayer film in the desired size and shape and inserted between the films of the intermediate layer. Typical intermediate layers are polyvinyl butyral films, which, in addition to their adhesive properties, offer high toughness and high acoustic damping. The intermediate layer prevents the laminated glass from disintegrating in the event of damage. The laminated glass merely cracks but remains dimensionally stable.

[0005] Such composite panels contain a functional element, typically an active layer sandwiched between two surface electrodes. The optical properties of the active layer can be modified by applying a voltage to the surface electrodes. One example of this is electrochromic functional elements. Another example is SPD (suspended particle device) or PDLC (polymer dispersed liquid crystal) functional elements. The transmission of visible light through electrochromic or SPD / PDLC functional elements can be controlled by applying a voltage to the surface electrodes.

[0006] SPD and PDLC functional elements are commercially available as multilayer films. The surface electrodes required for applying a voltage are arranged between two PET carrier films. The surface electrodes can be electrically connected to a control module (ECU) via ribbon cables outside the composite pane. The control module is designed to apply the electrical voltage between the surface electrodes.

[0007] To lead a flexible cable connection as an external connection from the interior of the composite pane, flat cables are usually used. These consist of at least a thin carrier substrate and a metallic conductor track (conductor strip). An additional cover layer can be provided so that the flat ribbon cable forms a three-layer laminate. The flat ribbon cables are soldered to connection surfaces close to the edge of the composite pane and are led outwards only over this edge, where they are connected to a round cable a short distance from the edge. The junction between the two cables is embedded in an encapsulation made of insulating material. Since moisture penetration into the encapsulation cannot be avoided, faults at the junction can occur as a result of sealing errors.

[0008] EP 1 058 349 A1 discloses a structure for connecting an electrical cable to a flat cable. Both the cable and the flat cable each comprise an elastic sealing material at their end portions. When the two cables are overmolded in the region of the connecting portion, the elastic sealing materials adhere to the outer surface of the respective cable through compression.

[0009] GB 2 539 834 A describes an electrical connection that electrically connects a flat cable and a cable, the electrical connection comprising a first seal, an optional second seal, and a sheath. The sheath encloses at least the first seal and the electrical contact.

[0010] WO 2013 / 178727 A1 relates to an electrical connector comprising an electrical cable surrounded by an insulating sheath and a housing arranged on a section of the electrical cable. A seal arranged on the electrical cable seals around the insulating sheath.

[0011] The object of the present invention is to provide an improved electrical cable connection that ensures a secure and permanently watertight seal at the cross-sectional transition. This object of the present invention is achieved by an electrical cable connection according to independent claim 1. Preferred embodiments of the invention are set out in the subclaims.

[0012] The invention comprises an electrical line connection with a cross-sectional transition region from a ribbon cable to a cable, in particular a round cable, wherein the ribbon cable comprises at least one electrical conductor track and a cover film for electrically insulating the conductor track. The cable further comprises an electrical conductor. In the cross-sectional transition region, an electrical connection is provided between the conductor track of the ribbon cable and the conductor of the cable. The cross-sectional transition region has encapsulation for electrical insulation. A first sealant is provided on the ribbon cable and a second sealant is provided on the cable. When the encapsulation is applied to the line connection, the first sealant is pressed firmly against the ribbon cable and the second sealant is pressed firmly against the cable, in particular a round cable, so that a seal is created around the respective cable.Such an arrangement of the sealing means (seals) ensures that the penetration of water into the encapsulation is prevented by a capillary effect.

[0013] According to the invention, the first sealant is a double-sided adhesive tape arranged on two opposite surfaces of the ribbon cable, wherein the first sealant can particularly preferably be provided around the ribbon cable. The adhesion provided by the adhesive tape advantageously supports the adhesion of the encapsulation to the ribbon cable, so that the connection between the encapsulation and the ribbon cable is very tight and stable. In particular, the adhesive tape can be an acrylic adhesive tape. In addition, the adhesive tape can be transparent. The material thickness of the adhesive tape can be from 25 μm to 2 mm, preferably from 100 μm to 150 μm, particularly preferably from 130 μm [micrometers].

[0014] The encapsulation can completely or partially cover the first sealant and the second sealant. Complete encapsulation of the sealant effectively seals off the passage of particles and water, preventing them from penetrating the encapsulation and damaging the pipe connection.

[0015] The second sealing means can have a ring shape, wherein the second sealing means flush surrounds the cable, in particular as a round cable, i.e., the second sealing means is provided all around the cable. The second sealing means can be attached and molded to the cable during production. The second sealing means can be mounted on the cable before the encapsulation is manufactured. The second sealing means can be formed as a collar portion on the cable.

[0016] The second sealant has one, two, or more sealing lips. The circumferential sealing lips extend along a radially outward-facing portion of the second sealant. The one or more sealing lips can increase the water resistance of the electrical cable connection. The two or more sealing lips can be arranged one behind the other in the direction of extension of the cable and spaced apart from one another. The two or more sealing lips can have outer edges running parallel to one another. Additionally, the second sealant can have a wave-shaped surface in sections on its surface facing the cable. The second sealant can contain silicone, polyvinyl chloride, or thermoplastic elastomers.

[0017] In a further embodiment of the electrical connection according to the invention, the conductor track of the ribbon cable can be electrically connected to the conductor of the cable via a soldered connection. Alternatively, the electrical connection can be established via an adhesive connection using an electrically conductive adhesive. The electrically conductive adhesive contains at least one electrically conductive material, preferably a metallic material, for example silver, gold, or aluminum. It is also possible for the electrically conductive adhesive to contain a non-metallic electrical material, for example graphite or carbon. The at least one electrically conductive material is incorporated into an electrically non-conductive adhesive matrix, for example epoxy resin. The at least one electrically conductive material is contained in the adhesive in such a quantity that a desired current-carrying capacity is achieved.Preferably, the at least one electrically conductive material is contained in the adhesive with a mass fraction of at least 70%.

[0018] The ribbon cable comprises at least one electrical conductor applied to the cover film as a carrier substrate made of plastic, which can also be covered with the cover film. The cover layer forms an insulating sheath that encloses the electrical conductor. The cover film preferably contains or consists of polyimide (PI) or polyester, particularly preferably polyethylene terephthalate (PET) or polyethylene naphthalate (PEN). The cover film can also consist of an electrically insulating lacquer, preferably a polymer lacquer. The cover film can also contain or consist of thermoplastics and elastomers such as polyamide, polyoxymethylene, polybutylene terephthalate, or ethylene propylene diene rubber. Alternatively, encapsulating materials such as acrylate or epoxy resin systems can be used as the cover film. Such cover films are cost-effective and simplify the manufacturing process.

[0019] The particularly flexible and / or bendable ribbon cable is used for electrical connection to an electrical component or a surface electrode. The ribbon cable is a flat body with two opposite sides, which can be made either flat or curved. In the flat (i.e. non-curved) state, the ribbon cable is arranged in one plane. The ribbon cable is generally elongated and has two ends along its direction of extension. The ribbon cable can also be provided with a plurality of, in particular parallel, electrical conductor tracks. The ribbon cable can preferably have up to 32, particularly preferably 8 to 10, conductor tracks. The conductor tracks are arranged in a common plane. Each conductor track can have a rectangular cross-section.A ribbon cable is an elongated electrical component with multiple electrical conductors, whose width is significantly greater than its thickness. The ribbon cable is so thin (i.e., its thickness is so small) that it is flexible and bendable. Its width can range from 0.1 mm to 100 mm.

[0020] Furthermore, the ribbon cable comprises at least two connection areas with contact points of the conductor tracks at two ends of the ribbon cable opposite each other in the direction of extension. The two connection areas of the ribbon cable serve to electrically contact the conductor tracks. For this purpose, the cover foil, i.e., carrier layer and / or insulation layer, is absent or removed at least at the contact points, so that the conductor tracks are accessible.

[0021] The electrical conductor tracks are arranged next to one another and / or one above the other, at least in sections. In a further advantageous embodiment of the invention, at least two electrical conductor tracks are arranged one above the other in at least two, preferably in exactly two or exactly three or exactly four, planes. Here, “one above the other” means with respect to the plane of extension of the ribbon cable, i.e. with respect to the plane spanned by the two larger dimensions of the ribbon cable. Advantageously, at least two conductor tracks are arranged congruently in the projection orthogonal to the plane of extension. Alternatively, the conductor track can also be larger in one plane and essentially partially or completely occupy the plane within the ribbon cable, preferably minus an insulating edge region. This increases the current-carrying capacity of this conductor track.Each electrical conductor track can be electrically contacted at two contact points spaced apart along the conductor track. The contact points are areas of the conductor tracks where electrical contact is possible. In the simplest design, these are accessible areas of the electrical conductor tracks. It may be necessary and useful to provide a separate cable connection for each pole, so that each conductor track of the ribbon cable is dedicated to connecting to a conductor of a cable.

[0022] The conductor tracks are applied using a printing process. Alternatively, the electrical conductor tracks are prefabricated as metal strips made of metal foil and laminated on both sides with a plastic material. In both cases, the electrical conductor tracks are mechanically stabilized and embedded in an insulating cover made of a cover foil, thus providing electrical insulation from the external environment.

[0023] The metal foil may contain or consist of copper foil, aluminum foil, stainless steel foil, tin foil, gold foil, or silver foil. The metal foil may also contain or consist of alloys containing the aforementioned metals. The metal foil may advantageously be partially or completely tinned. This is particularly advantageous for achieving good solderability while simultaneously providing corrosion protection.

[0024] In an advantageous embodiment of the ribbon cable according to the invention, the at least one conductor track has a thickness of 35 pm to 100 pm, preferably 50 pm to 70 pm. The conductor track or the plurality of conductor tracks each contain, for example, a thin copper, silver, tin or gold foil. The foils can additionally be coated, for example silver-plated, gold-plated or tin-plated. The thickness of the foils is, for example, 35 pm, 50 pm, 75 pm or 100 pm. According to one embodiment, the electrical conductor tracks have a width of 0.05 mm to 40 mm, preferably 1 mm to 22 mm and in particular 2 mm to 5 mm. Such widths are particularly suitable for achieving sufficient current-carrying capacity in conjunction with the above-mentioned thicknesses.

[0025] Such flexible ribbon cables have a connection area (contact points) at both ends, each of which has at least one recess in the cover foil.

[0026] In a further preferred embodiment of the electrical cable connection according to the invention, the encapsulation comprises a plastic as the insulating material. The encapsulation can consist of a suitably strong plastic, for example polyimide (PI) or PA66 in combination with glass fibers. The encapsulation can be produced, for example, by injection molding, wherein the encapsulation is designed as a rectangular or round housing. Preferably, the encapsulation essentially has the shape of a circular disk with a projection at the exit area of ​​the round cable. Because the edge of the encapsulation facing the ribbon cable is rounded, a straight bend can be avoided.

[0027] The cable, in particular a round cable, has a connecting element, in particular a socket or plug, at its end facing away from the encapsulation. In addition to an electrically conductive conductor (inner conductor or also called core, wire or core), the cable can comprise an insulating, preferably polymeric cable sheath, wherein the insulating cable sheath is preferably removed in the end region of the cable in order to enable an electrically conductive connection between the conductor of the (round) cable and the ribbon cable or the connecting element. The electrically conductive conductor of the round cable can contain, for example, copper, aluminum and / or silver or alloys or mixtures thereof. The round cable preferably has a round or oval cross-section, which is, for example, 0.3 mm 2 up to 6 mm 2 amounts.

[0028] The invention also comprises a substrate with a functional element comprising the electrical line connection according to the invention.

[0029] The invention further relates to a composite pane comprising the substrate according to the invention. The substrate is formed as a first pane, wherein the composite pane has a second pane and two intermediate layers between the first pane and the second pane. The functional element is arranged between the two intermediate layers, wherein the ribbon cable is electrically connected at one end to a surface electrode of the functional element.

[0030] The laminated pane comprises a first pane and a second pane, which are preferably made of glass, particularly preferably of soda-lime glass, as is common for window panes. However, the panes can also be made of other types of glass, such as quartz glass, borosilicate glass, or aluminosilicate glass, or of rigid, clear plastics, such as polycarbonate or polymethyl methacrylate. The panes can be clear, tinted, or colored. If the laminated pane is used as a windshield, it should have sufficient light transmission in the central viewing area, preferably at least 70% in the main viewing area A according to ECE-R43. The first pane and the second pane can also be referred to as the outer and inner panes.

[0031] The first pane, the second pane and / or the intermediate layer may have further suitable coatings known per se, for example anti-reflective coatings, non-stick coatings, anti-scratch coatings, photocatalytic coatings or sun protection coatings or low-E coatings.

[0032] The thickness of the first pane and the second pane can vary widely and thus be adapted to the requirements of the individual case. The first pane and the second pane advantageously have standard thicknesses of 0.7 mm to 25 mm, preferably from 1.4 mm to 2.5 mm for vehicle glass and preferably from 4 mm to 25 mm for furniture, appliances and buildings, in particular for electric radiators. The size of the panes can vary widely and depends on the size of the application according to the invention. The first and second panes have areas of 200 cm, which are common in vehicle construction and architecture, for example. 2 up to 20 m 2on.

[0033] The functional element has electrically controllable optical properties and comprises a first carrier film, a first surface electrode, an active layer, a second surface electrode, and a second carrier film arranged one above the other. According to one embodiment of the composite pane according to the invention, the functional element is a so-called PDLC (Polymer Dispersed Liquid Crystal) functional element.

[0034] The active layer has variable optical properties that can be controlled by an electrical voltage applied to the active layer. For the purposes of the invention, electrically controllable optical properties are understood to mean those properties that can be continuously controlled, but equally those that can be switched between two or more discrete states. The optical properties relate in particular to light transmission and / or scattering behavior.

[0035] The first and second carrier films are, in particular, polymeric or thermoplastic films. The carrier films, in particular, contain or consist of a thermoplastic material. The thermoplastic material can be a thermoplastic polymer or a mixture of two or more thermoplastic polymers. In addition to the thermoplastic material, the carrier film can also contain additives, such as plasticizers. The thermoplastic material of the carrier films is preferably polyethylene terephthalate (PET), as is common for commercially available functional elements.

[0036] The thermoplastic material of the carrier film can also contain or consist of blends of PET with other thermoplastic polymers and / or PET copolymers. The thermoplastic material of the carrier film can also contain or consist of, for example, PU, ​​polypropylene, polycarbonate, polymethyl methacrylate, polyacrylate, polyvinyl chloride, polyacetate resin, fluorinated ethylene propylene, polyvinyl fluoride, and / or ethylene tetrafluoroethylene. The thickness of each carrier film is preferably in the range of 0.03 mm to 0.4 mm, more preferably 0.04 mm to 0.2 mm.

[0037] The surface electrodes of the functional element comprise an electrically conductive coating on the carrier foil. The side of the carrier foil with the electrically conductive coating forming the surface electrode then faces the active layer.

[0038] In a further advantageous embodiment, the functional element can be divided into segments by insulation lines. The insulation lines are incorporated, in particular, into the surface electrodes, so that the segments of the surface electrode are electrically insulated from one another. The individual segments can be connected independently of one another via a connection area and the flat conductor to an external voltage source, so that they can be controlled separately during operation. A segment of the functional element has two connection areas. Each connection area has a contact. This allows, for example, different areas of the functional element, e.g., as a sun visor, to be switched independently.

[0039] In a further preferred embodiment, the functional element is a PNLC or SPD functional element. In SPD functional elements, the active layer contains suspended particles, whereby the absorption of light by the active layer can be varied by applying a voltage to the surface electrodes. PNLC functional elements (PNLC = polymer network liquid crystal) contain an active layer in which the liquid crystals are embedded in a polymer network, with the functionality otherwise being analogous to that of PDLC functional elements.

[0040] The surface electrodes are designed to be electrically connected to an external voltage source. Contacting the surface electrodes is preferably achieved by (ultrasonic) soldering, crimping, or gluing. For this purpose, a conductive material, in particular a paste, or a solder contact is applied to at least one of the surface electrodes. The paste contains silver or a silver-containing alloy. The conductive material is connected to the surface electrodes as so-called bus bars, for example, strips of electrically conductive material or electrically conductive prints. The surface electrodes can each be electrically contacted by means of a bus bar.

[0041] In an alternative embodiment of the bus bars, thin and narrow metal foil strips or metal wires are used, which preferably contain copper and / or aluminum; in particular, copper foil strips with a thickness of approximately 50 μm are used. The width of the copper foil strips is preferably 1 mm to 10 mm. During further processing of the functional element, the metal foil strips or metal wires are applied to the surface electrode in a composite of thermoplastic layers. In the subsequent autoclave process, a secure electrical contact between the bus bars and the coating is achieved through the action of heat and pressure. The electrical contact between the surface electrode and the bus bar can alternatively be established by soldering or gluing with an electrically conductive adhesive.

[0042] The bus bars are attached to the surface electrodes by removing the carrier foil, one surface electrode, and the active layer, leaving the other surface electrode with its associated carrier foil protruding. This can preferably be done along an edge area of ​​the respective side of the functional element. A bus bar can then be attached to the protruding surface electrode, or the ribbon cable can be directly contacted with the surface electrode. On the opposite side of the respective functional element, another bus bar is attached to the other surface electrode in a similar manner.

[0043] In an advantageous embodiment, the functional element is a PDLC functional element, in particular one that switches at least one region of a glazing unit from a transparent to an opaque state and vice versa. The active layer of a PDLC functional element contains liquid crystals embedded in a polymer matrix. The thickness of the functional element is, for example, between 0.09 mm and 1 mm.

[0044] The invention further extends to a vehicle having the electrical line connection according to the invention.

[0045] The invention further extends to a method for producing the electrical cable connection according to the invention with a cross-sectional transition region, wherein the encapsulation is produced by injection molding. In a first embodiment of the method according to the invention, a plastic in molten form, particularly a viscous liquid, is applied within a mold around the cross-sectional transition region. Then, by applying temperature and pressure in the mold, it is bonded to the ribbon cable and round cable and cured. This provides watertight protection and insulation for the connection between the round cable and ribbon cable.

[0046] Furthermore, the invention extends to the use of the electrical cable connection according to the invention in a vehicle, in particular a motor vehicle, for traffic on land, on water or in the air.

[0047] The invention is explained in more detail below with reference to figures and exemplary embodiments. The figures are schematic representations and not to scale. The figures do not limit the invention in any way.

[0048] They show:

[0049] Figure 1 is a schematic plan view of a composite pane with a line connection according to the invention,

[0050] Figure 2 is a schematic plan view of an embodiment of the line connection according to the invention,

[0051] Figure 3 is a schematic cross-sectional view of a ribbon cable,

[0052] Figure 4 is a cross-sectional view of the line connection according to the invention with a first sealing means and a second sealing means,

[0053] Figures 5A to 5C show an embodiment of the second sealing means, and

[0054] Figure 6 is a schematic side view of the cable connection according to the invention.

[0055] The invention is described in more detail below with reference to the figures. It should be noted that various aspects are described, each of which can be used individually or in combination. This means that any aspect can be used with different embodiments of the invention unless explicitly presented as a mere alternative. Numerical values ​​are generally not to be understood as exact values, but also include a tolerance of + / - 1% to + / - 10%.

[0056] Figure 1 shows a composite pane 100 and a substrate 101 with a line connection 10 according to the invention. The composite pane 100 and the substrate 101 are designed, for example, as glazing units. In this case, the composite pane 100 is designed as a roof pane of a motor vehicle.

[0057] The composite pane 100 comprises the substrate as a first pane 101 and a second pane 102. In the installed position, the first pane 101 serves as the inner pane and the second pane 102 as the outer pane. The inner pane is the pane facing the vehicle interior, while the outer pane faces the vehicle's surroundings. The surface of the outer pane facing the vehicle's surroundings (second pane 102) is referred to as surface I, as is common in vehicle glazing technology, and the surface of the inner pane facing the vehicle interior (first pane 101) is referred to as surface IV. The two panes 101 and 102 are made, for example, of soda-lime glass. The two panes 101 and 102 are firmly bonded to one another by two thermoplastic intermediate layers 103, for example made of polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA), or polyurethane (PU).

[0058] The composite pane 100 is provided with a similarly electrical functional element, which is located between the two panes 101 and 102. The electrical functional element can, for example, be a PDLC functional element, which serves, for example, as electrically adjustable sun or privacy protection. The PDLC functional element is formed by a commercially available PDLC multilayer film, which is embedded in the intermediate layer 103. For this purpose, the intermediate layer 103 comprises, for example, a total of three thermoplastic films (not shown) with a thickness of, for example, 0.38 mm made of PVB, wherein a first thermoplastic film is connected to the first pane 101 and a second thermoplastic film is connected to the second pane 102, and wherein an intermediate thermoplastic frame film has a cutout into which the cut-to-size functional element is precisely inserted.The third thermoplastic film thus forms a kind of mount for the functional element, which is thus completely encapsulated in thermoplastic material and thus protected. The PDLC functional element typically comprises an active layer between two surface electrodes and two carrier films. The active layer contains a polymer matrix with liquid crystals dispersed therein, which align themselves depending on the electrical voltage applied to the surface electrodes, thus allowing the optical properties to be controlled. The surface electrodes can be electrically contacted via bus bars. Electrical connections are required to apply a voltage to the bus bars.

[0059] The composite pane 100 further comprises a ribbon cable 1. The bus bars of the functional element are electrically connected to the ribbon cable 1. A secure electrically conductive connection is preferably achieved by soldering the connection.

[0060] The functional element is a PDLC functional element that acts as an adjustable sun or privacy screen. The driver or another vehicle occupant can operate the PDLC functional element, for example, via a touch control, depending on the position of the sun.

[0061] It is understood that the ribbon cable 1 can be adapted to the specific circumstances of the actual application and can, for example, extend over two, three, or four levels. Alternatively, or in combination, more or fewer conductor tracks per level can be arranged next to each other.

[0062] As illustrated in the schematic inset of Figure 1, the ribbon cable 1 is partially laminated with its first end .4 into the composite disc 100 and led out of the composite disc 2 between the two discs 101 and 102.

[0063] In Figure 1, the ribbon cable 1 is routed around the side surface of the first disk 101 and arranged on the surface IV of the first disk 101. For this purpose, the first disk 101 can have a recess in the exit area 29, for example, through a ground area (not shown here).

[0064] The ribbon cable 1 has a first connection region 1.5 and a second connection region 1.8, wherein, along a direction of extension of the ribbon cable 1, the first connection region 1.5 is located at the first end 1.4 and the second connection region 1.8 is located at a second end 1.7 of the ribbon cable 1. The ribbon cable 1 has at least one connection electrode in the first connection region 1.5 for electrically (e.g., galvanically) contacting the functional element. The second connection region 1.8 is located within an encapsulation 12 into which at least one end of a cable, in particular a (round) cable 2, is inserted. The line connection 10 according to the invention with the cross-sectional transition region 11 can be manufactured simply and cost-effectively and allows space-saving, flexibly usable, and permanently stable electrical contacting of a functional element arranged in a composite pane 100.

[0065] Figure 2 shows a plan view of a further embodiment of the cable connection 10 according to the invention. Four cable connections 10 arranged in parallel are shown. Each electrical cable connection 10 comprises a ribbon cable 1, which has a conductor track 1.1 and a cover film 1.2 for insulating the conductor track 1.1.

[0066] At its two ends 1.4 and 1.7, which are opposite in the direction of extension, each ribbon cable 1 has a first connection area 1.5 and a second connection area 1.8. The connection areas 1.5 and 1.8 of the ribbon cable 1 serve to electrically contact the conductor tracks 1.1. The second connection area 1.8 is located within the encapsulation 12, into which one end of the round cable 2 is inserted.

[0067] The encapsulation 12 consists, for example, of a solid plastic, such as polyamide (PA) and / or polyimide (PI), PBT, PA611, PA12, PA6, or PA66 in combination with glass fibers (up to 50%). The encapsulation 12 serves to insulate and mechanically protect the electrical contact (e.g., soldering) between the ribbon cable 1 and the round cable 2. The encapsulation 12 can be manufactured, for example, by injection molding or 3D printing.

[0068] The cover film 1.2 is at least partially removed at the contact points, allowing access to the conductor tracks 1.1. The cover film 1.2 has a recess. This can be achieved, for example, by a window technique during production or by subsequent removal of the cover film 1.2, for example, by laser ablation.

[0069] The cross-sectional transition area 11 comprises an electrical connection between the conductor track 1.1 of the ribbon cable 1 and the conductor 2.1 of the round cable 2. The cross-sectional transition area 11 has the encapsulation 12.

[0070] The round cable 2 comprises an electrically conductive conductor 2.1 and an insulating, polymeric cable sheath. The insulating cable sheath is removed at the end of the cable to enable an electrically conductive connection between the conductor 2.1 of the cable 2 and the conductor track 1.1. The electrically conductive conductor 2.1 of the cable 2 contains copper. The cable 2 has a round cross-section, with a cross-sectional area of, for example, 5 mm 2 amounts.

[0071] The round cable 2 can, in principle, be any connecting cable known to those skilled in the art for making electrical contact with a functional element and suitable for being connected to a connecting element (also called a crimp contact) by crimping or clamping. The conductor 2.1 (also referred to as the core or core) of the round cable 2 is stripped at its end facing the ribbon cable 1 and firmly connected to the conductor track 1.1 via a solder connection 5. At the end of the round cable 2 facing away from the ribbon cable 1, a connecting element, for example a plug or socket 17, can be arranged for further electrical connection, for example to on-board electronics.

[0072] Figure 3 shows a schematic cross-sectional view of a configuration of the ribbon cable 1. The conductor tracks 1.1 are evenly spaced from one another and each have a rectangular cross-section. The conductor tracks 1.1 are enclosed in an insulating sleeve consisting of a cover foil 1.2. The cover foil 1.2 is glued to the conductor track 1.1.

[0073] The ribbon cable 1 can comprise several conductor tracks 1.1. The conductor tracks 1.1 are then arranged side by side and / or one above the other. The electrical conductor tracks 1.1 consist, for example, of a thin copper, silver, tin, or gold foil. The foils can be additionally coated, for example, silver-plated, gold-plated, or tin-plated. The thickness of the foils is, for example, 35 μm, 50 μm, 75 μm, or 100 μm.

[0074] A polyimide film, preferably black or yellow polyimide films (e.g., PI-MTB / MBC), with a thickness of 25 μm, is particularly suitable for the cover film 1.2. Alternatively, polymer films made of PEN, preferably white PEN, with a thickness of 25 μm, can be used.

[0075] Adhesive layers between the first cover film 1.2 and the electrical conductor track 1.1 can contain or consist of epoxy adhesives or thermoplastic adhesives, for example. Typical thicknesses of the adhesive films are from 25 μm to 35 μm. The adhesives can be transparent or colored, for example, black.

[0076] Figure 4 shows an embodiment of the cable connection 10 according to the invention with a first sealing means 1.3 and a second sealing means 2.3. The electrical cable connection 10 according to the invention comprises a cross-sectional transition region 11 from the ribbon cable 1 according to the invention to a round cable 2 comprising at least one electrical conductor 2.1. The ribbon cable 1 comprises the conductor track 1.1 and the cover film 1.2. The cover film 1.2 has a recess so that the conductor track 1.1 can be contacted with the conductor 2.1 of the round cable 2.

[0077] The cross-sectional transition region 11 comprises the electrical connection between the conductor track 1.1 of the ribbon cable 1 and the conductor 2.1 of the round cable 2. The cross-sectional transition region 11 comprises the encapsulation 12. The encapsulation 12 has a circular cross-section with a projection at the exit area of ​​the round cable 2.

[0078] The first sealant 1.3 is provided on the ribbon cable 1, and the second sealant 2.3 is provided on the round cable 2. When the encapsulation 12 is applied to the cable connection 10, the first sealant 1.3 is pressed firmly against the ribbon cable 1, and the second sealant 2.3 is pressed firmly against the round cable 2, creating a seal around the respective cable. This arrangement of the sealants 1.3 and 2.3 (seals) ensures that water penetration into the encapsulation 12 is prevented by capillary action.

[0079] The first sealant 1.3 is a double-sided adhesive tape arranged on two opposite surfaces of the ribbon cable 1. The first sealant 1.3 is applied around the ribbon cable 1. The adhesion provided by the adhesive tape advantageously supports the adhesion of the encapsulation 12 to the ribbon cable 1, so that the connection between the encapsulation 12 and the ribbon cable 1 is very tight and stable. In particular, the adhesive tape can be an acrylic adhesive tape. In addition, the adhesive tape can be transparent. The material thickness of the adhesive tape can be from 25 μm to 2 mm, preferably from 100 μm to 150 μm, particularly preferably 130 μm.

[0080] The encapsulation 12 can cover the first sealing means 1.3 and the second sealing means 2.4 completely or only partially.

[0081] The round cable 2 comprises an electrically conductive conductor 2.1 as well as an insulating, polymeric cable sheath. The insulating cable sheath is removed at the end of the cable to enable an electrically conductive connection between the conductor 2.1 of the round cable 2 and the conductor track 1.1. The electrically conductive conductor 2.1 of the round cable 2 contains copper. The round cable 2 has a round cross-section, the cross-sectional area of ​​which is, for example, 5 mm 2 amounts.

[0082] Figures 5A to 5C show an embodiment of the second sealing means 2.3. The second sealing means 2.3 has a ring shape. The second sealing means 2.3 encloses the round cable 2 flush, i.e., the second sealing means 2.3 is arranged all around the round cable 2 (Figure 4). The second sealing means 2.3 can be attached and molded to the round cable 2 during production. The second sealing means 2.3 can be mounted on the round cable before the encapsulation 12 is manufactured. As shown in Figure 4, the second sealing means 2.3 is formed as a collar section on the round cable 2.

[0083] The second sealing means 2.3 shown in Figure 5A has three sealing lips 2.4. Alternatively, the second sealing means 2.3 can have one, two, or four sealing lips 2.4. The circumferential sealing lips 2.4 extend along a radially outward-facing section of the second sealing means 2.3. The three sealing lips 2.4 can achieve greater water resistance of the electrical cable connection. In addition, the second sealing means 2.3 can have a wave-shaped surface in sections on its surface facing the round cable 2. As shown in Figure 5B, the three sealing lips 2.4 are arranged one behind the other in the direction of extension of the round cable 2 and are spaced apart from one another. The three sealing lips 2.4 have outer edges that run parallel to one another. Figure 5C shows a perspective top view of the second sealing means 2.3. The second sealing means can contain silicone, polyvinyl chloride, or thermoplastic elastomers.

[0084] Figure 6 shows the cable connection 10 according to the invention with a cross-section through the encapsulation 12. The encapsulation 12 is manufactured by injection molding. The encapsulation 12 essentially has the shape of a circular disk with a projection at the exit area of ​​the round cable 2. This shape of the encapsulation 12 encloses the first sealant 1.3 and the second sealant 2.3, creating a highly sealed and durable connection. The first sealant 1.3 and the second sealant 2.3 ensure that the electrical cable connection 10, in particular the encapsulation area, is sealed and watertight. List of reference symbols:

[0085] 1 ribbon cable

[0086] 1.1 Conductor track

[0087] 1.2 Cover film

[0088] 1.3 first sealant

[0089] 1.4 first end

[0090] 1.5 first connection area

[0091] 1.6 first section of the flat cable

[0092] 1.7 second end

[0093] 1.8 second connection area

[0094] 2 round cables

[0095] 2.1 Cable conductor

[0096] 2.3 second sealant

[0097] 2.4 Sealing lip

[0098] 4 adhesive tape

[0099] 5 Solder connection

[0100] 10 Line connection

[0101] 11 Cross-sectional transition area

[0102] 12 Encapsulation

[0103] 17 socket or plug

[0104] 19 protective housings

[0105] 29 Exit point

[0106] 100 composite panes

[0107] 101 first disc (substrate)

[0108] 102 second disc

[0109] 103 Intermediate layer I second surface (outside) of the second pane 102

[0110] IV first surface (inside) of the first disc 101

Claims

Patent claims 1. Electrical cable connection (10) with a cross-sectional transition area (11) from a ribbon cable (1) to a cable (2), in particular a round cable, - wherein the ribbon cable (1) comprises at least one electrical conductor track (1.1) and a cover film (1.2) for electrically insulating the conductor track (1.1), - wherein the cable (2) comprises at least one electrical conductor (2.1), - wherein an electrical connection is provided in the cross-sectional transition area (11) between the conductor track (1.1) of the ribbon cable (1) and the conductor (2.1) of the cable (2), - wherein the cross-sectional transition region (11) has an encapsulation (12) for electrical insulation, and wherein a first sealing means (1.3) is provided on the ribbon cable (1) and a second sealing means (2.3) is provided on the cable (2), wherein the first sealing means (1.3) is a double-sided adhesive tape (4) which is arranged on two opposite surfaces of the ribbon cable (1) and wherein the second sealing means (2.3) has one or more sealing lips (2.4).

2. Electrical cable connection (10) according to claim 1, wherein the adhesive tape (4) is an acrylic adhesive tape.

3. Electrical cable connection (10) according to one of the preceding claims, wherein the adhesive tape (4) is transparent.

4. Electrical line connection (10) according to one of the preceding claims, wherein the first sealing means (1.3) and the second sealing means (2.3) are covered by the encapsulation (12).

5. Electrical cable connection (10) according to one of the preceding claims, wherein the second sealing means (2.3) has a ring shape.

6. Electrical cable connection (10) according to one of the preceding claims, wherein the second sealing means (2.3) contains silicone, polyvinyl chloride or thermoplastic elastomers.

7. Electrical cable connection (10) according to one of the preceding claims, wherein the second sealing means (2.3) is formed as a collar portion on the cable (2).

8. Electrical cable connection (10) according to one of the preceding claims, wherein the conductor track (1.1) of the ribbon cable (1) is electrically connected to the conductor (2.1) of the cable (2) via a solder connection.

9. Electrical line connection (10) according to one of the preceding claims, wherein the encapsulation (12) comprises a plastic as insulating material.

10. Electrical cable connection (10) according to one of the preceding claims, wherein the encapsulation (12) has the shape of a circular disc with a projection at the exit region of the round cable (2).

11. Substrate (101) with a functional element comprising an electrical line connection (10) according to one of the preceding claims.

12. Composite pane (100) comprising the substrate (101) according to claim 11.

13. Composite pane according to claim 12, wherein the substrate (101) is formed as a first pane and the composite pane (100) comprises a second pane (102) and two intermediate layers (103) between the first pane (101) and the second pane (102), wherein a functional element is arranged between the two intermediate layers (103) is arranged and the ribbon cable (1) is electrically conductively connected at the first end (1.4) to a surface electrode of the functional element and is provided with the second end (1.7) via the round cable (2) for connection to a supply voltage of a vehicle.

14. Vehicle comprising an electrical line connection (10) according to one of the preceding claims 1 to 10.

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