EP4092688A1 - Conduite électrique et procédé de fabrication de la conduite électrique - Google Patents

Conduite électrique et procédé de fabrication de la conduite électrique Download PDF

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Publication number
EP4092688A1
EP4092688A1 EP21305648.4A EP21305648A EP4092688A1 EP 4092688 A1 EP4092688 A1 EP 4092688A1 EP 21305648 A EP21305648 A EP 21305648A EP 4092688 A1 EP4092688 A1 EP 4092688A1
Authority
EP
European Patent Office
Prior art keywords
electrically conductive
hose
conductive fluid
electrical
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP21305648.4A
Other languages
German (de)
English (en)
Inventor
Michael FENEIS
Helmut Steinberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nexans SA
Original Assignee
Nexans SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nexans SA filed Critical Nexans SA
Priority to EP21305648.4A priority Critical patent/EP4092688A1/fr
Publication of EP4092688A1 publication Critical patent/EP4092688A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0009—Details relating to the conductive cores
    • H01B7/0027—Liquid conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
    • H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
    • H01R11/12—End pieces terminating in an eye, hook, or fork

Definitions

  • the invention relates to an electrical line, in particular a flexible electrical line. Furthermore, the invention relates to a method for producing an electrical line according to the invention and a system for carrying out the method.
  • Aluminum conductors are increasingly being used as a replacement for copper conductors, particularly for reasons of weight and cost.
  • the main areas of use for such conductors are, for example, automotive and aircraft technology.
  • the lower electrical conductivity of aluminum compared to copper is irrelevant for most applications.
  • aluminum conductors are much more difficult to contact than copper conductors, for example, because aluminum conductors are surrounded by an oxide layer that is a very poor electrical conductor.
  • Aluminum cables are used, for example, as busbars or stranded conductors.
  • a conductor rail has a solid aluminum conductor, with which the contacting problem mentioned can be mastered comparatively easily.
  • the disturbing oxide layer can be avoided by a galvanic coating of copper at the contact points of the busbar.
  • busbars have the disadvantage that they are essentially rigid structures that are not suitable for every installation situation, particularly in vehicle construction, where installation space is generally very limited. Another major limitation is that busbars cannot be used to connect components or assemblies that move relative to each other. For example, a connection with a conductor rail to a wheel hub motor of an electric vehicle is not conceivable.
  • a method is known in which a pot-shaped contact piece is pushed onto a stranded conductor.
  • the contact piece is equipped with different connection elements.
  • the contact piece is produced as a one-piece component by deep-drawing and is bonded to the conductor by friction stir welding.
  • the present invention has the object of creating an electrical line in order to overcome or at least improve one or more of the problems mentioned at the outset.
  • an electrical line which comprises a flexible hose, at the ends of which electrical contact pieces are arranged and which is filled with an electrically conductive fluid which establishes an electrical connection between the contact pieces.
  • fluid designates a gaseous, liquid or powdered solid material. These materials have the property that a tube filled with them remains flexible transversely to its longitudinal extension and thus represents a flexible, elongate structure.
  • Metal powder for example made of copper, aluminum and their alloys, is particularly suitable as the electrically conductive fluid. Mixtures of powder from different materials can also be realized for certain applications. In addition to metal powder, non-metallic materials that have high electrical conductivity, such as graphene, can also be used.
  • An advantage of the line according to the invention is that it is flexible, without causing the problems with regard to the contacting of the conductor that are known, for example, from aluminum stranded conductors.
  • the electrically conductive fluid in the flexible hose is under an overpressure.
  • the overpressure ensures that there is good electrical contact between the particles of an electrically conductive powder and between the particles and contact pieces of the cable.
  • the electrical contact produced in this way is not impaired by oxide layers or the like.
  • the electrically conductive fluid is a gaseous or liquid material.
  • excess pressure can have a beneficial effect on electrical conductivity.
  • the hose is designed to be pressure-resistant as a high-pressure hose and withstands pressures in the range from 10 to 1000 bar, in particular pressures in the range from 100 to 600 bar.
  • Such hoses are used, for example, in construction machines and are commercially available. This circumstance has a favorable effect on the production costs of the line.
  • the hose is expediently closed with closure parts which enclose the electrically conductive fluid in the hose.
  • a gas-tight and pressure-resistant closure of the hose is of great importance in order to guarantee the electrical properties of the cable over a longer service life.
  • the closure parts advantageously compress the electrically conductive fluid in the tube in order to generate an overpressure. If the locking parts take on several functional tasks at the same time, it simplifies the structure of the line.
  • the electrically conductive fluid can be compressed in the tube.
  • the electrically conductive powder is compacted after the tube has been filled with an electrically conductive powder and before the tube is closed at its second end.
  • Compaction can be achieved, for example, by mechanically vibrating the tube to compact the powder enclosed in the tube.
  • the hose is filled in an inert gas atmosphere.
  • the protective gas atmosphere prevents oxidation of the electrically conductive fluid used, which has an unfavorable effect on the electrical conductivity.
  • FIG 1 shows an exemplary embodiment of an electrical line 100 according to the invention.
  • the line 100 has an electrically conductive powder 220 ( Figure 2C ) filled pressure-resistant high-pressure hose 101.
  • the ends 102,103 of the high-pressure hose 101 are closed with contact pieces 104,105.
  • the line 100 can be connected to corresponding connections (not shown) of electrical units such as a generator or motor and a battery.
  • the electrically conductive powder is under pressure in the high-pressure hose 101 and is compressed in such a way that the powder forms a conductor with a diameter of, for example, 5-20 mm in transverse direction is flexible, ie bendable.
  • the electrical properties of the conductor in the high-pressure hose 101 are comparable to a solid conductor made of the same material as the electrically conductive powder.
  • the mechanical properties of the line 100 in particular its bending flexibility, generally correspond to a stranded conductor with wires made of copper or aluminum.
  • the mechanical properties in particular the tensile strength, are essentially determined by the high-pressure hose 101, which represents a sheathing of the electrical conductor.
  • the tensile strength of a stranded line is determined by the conductor wires or individual lines of the stranded line. This means that in the case of a stranded cable, the mechanical properties are essentially determined by the electrical conductor or conductors.
  • the end 102 of the high-pressure hose 101 is shown in a cross-sectional view.
  • the high-pressure hose 101 has an inner layer 201 made of oil- and water-resistant synthetic rubber (nitrile rubber, NBR), which is surrounded by an insert 202 made of high-strength steel wire mesh.
  • the insert 202 reinforces the high-pressure hose 101 in order to make it resistant to internal pressure and external mechanical stress.
  • Surrounding the liner 202 is an outer layer 203 made of an abrasion, oil, ozone and weather resistant rubber.
  • a cylindrical nipple 204 is inserted into the end 102 of the high-pressure hose 101 .
  • the nipple 204 is inserted so far into the high-pressure hose 101 that a small gap S1 remains between a peripheral projection 206 formed on the nipple and the front end of the high-pressure hose 101 .
  • the nipple 204 has a section 207 whose outside diameter is larger than the section of the nipple 204 that is inserted into the high-pressure hose.
  • An annular groove 208 is cut into the section 207, into which a retaining ring 209 with a protruding internal lug 211 is inserted.
  • a cylindrical Press mount 213 encloses the nipple 204 and the high-pressure hose 101.
  • Two circumferential webs 214, 215 lying on the inside of the press mount 213 overlap the projection 206 of the nipple 204 and create a positive connection between the press mount 213 and the nipple 204.
  • the press fitting 213 has internal ribs 217 which are pressed into the outer layer 203 and the insert 202 of the high-pressure hose 101 and produce a non-positive and positive connection between the press fitting 213 and the high-pressure hose 101 .
  • the press fitting 213 ensures a mechanically stable and pressure-resistant connection between the high-pressure hose 101 and the nipple 204.
  • the nipple 204 has a through hole 218 which is provided with an internal thread 219.
  • Figure 2A is the electrically conductive powder 220 ( Figure 2C ) omitted for clarity.
  • Figure 2B shows a threaded bolt 221 with an external thread 222.
  • a contact shoe 223 is formed at one end of the threaded bolt 221.
  • the contact shoe 223 is an example of any contact piece adapted to the respective application.
  • the threaded bolt 221 is used to close the high-pressure hose 101 at its ends 102,103.
  • the threaded bolt 221 combines a closure part, which closes the hose 101, and a contact piece.
  • the contact shoe 223 forms the contact piece.
  • other locking parts are used, such as plain bolts that are pressed into the nipple 204 with a swivel nut or the like.
  • closure parts are provided which provide a mechanical connection in order to be connected to different contact pieces.
  • the mechanical connection between the closure part and the contact piece can be established, for example, via a screw connection.
  • Figure 2C shows the end 102 of the high-pressure hose 101 with a threaded bolt 221 screwed in.
  • the high-pressure hose 101 is filled with an electrically conductive powder.
  • the electrically conductive powder 220 is, for example, powdered metal, in particular copper or aluminum and their alloys, and forms the electrically conductive fluid.
  • the filling process of the high-pressure hose 101 preferably takes place under an oxygen-free protective gas atmosphere in order to avoid surface oxidation of the grains of the electrically conductive powder 220, in particular the metal powder.
  • the metal powder is therefore only removed from storage containers for the filling process under an inert gas atmosphere. This procedure is particularly necessary for aluminum and aluminum alloys for the reasons mentioned above.
  • Figure 2C the electrically conductive powder 220 is shown schematically. In reality, the grains of the electrically conductive powder 220 are close to each other so that electrically conductive contacts are formed between the grains of the electrically conductive powder 220 .
  • the threaded bolt 221 protrudes beyond the section of the nipple 204 that is inserted into the high-pressure hose 101 and into the high-pressure hose 101 .
  • figure 3 shows a schematic flow diagram for a method for producing the electrical line.
  • a hydraulic high-pressure hose is cut to a length desired for the electrical line 100.
  • a first end of the high-pressure hose is closed with a first closure part.
  • the high-pressure hose is filled with an electrically conductive fluid.
  • the high-pressure hose 101 is made to vibrate in a step S4 before the hose 101 is closed with the second closure part.
  • the powder settles as a result of the vibration and the set pressure with which the powder is compressed does not change during the service life of the electrical line 100 or only to an extent that does not impair the function of the electrical line 100 .
  • Step S4 is not necessary when using a liquid or gaseous fluid and is therefore an optional step in the manufacturing process. Step S4 is in figure 3 therefore shown dashed.
  • step S5 the hose is closed at its second end. Simultaneously with the closing of the high-pressure hose at its second end, the electrically conductive fluid located in the high-pressure hose is compressed in a step S6 until a desired final pressure is reached. If the closure parts already have a contact piece, the method ends at this point. at Closure parts that do not include a contact piece, the next step S7 is to attach a contact piece to the first or second closure part. Step S7 does not necessarily take place and is therefore in figure 3 also shown in dashed lines.
  • FIG. 1 schematically shows a system for producing a line 100 according to the invention.
  • a chamber 401 which is filled with protective gas such as argon, carbon dioxide or nitrogen.
  • a line 100 which is still open on one side, is held in a holding device 402 .
  • a predetermined quantity of metal powder is filled from a storage container 403 into the high-pressure hose 101 of the line 100 , which is still open at the end at the top, using a funnel 404 .
  • the funnel 404 is so deep in the open end 103 of the hose 101 that the metal powder cannot contaminate the thread of the nipple 204 at the open end 103 of the high-pressure hose 101.
  • a robot 405 then threads a threaded bolt 221 into the open end 102 of the hose 101 to complete the line.
  • the robot 405 tightens the threaded bolt with a predetermined torque to create a predetermined pressure within the conduit 100 .
  • the system is designed such that storage locations for raw material and finished lines 100 are provided within chamber 401 so that the protective gas atmosphere has to be broken as rarely as possible in order to remove raw material and finished lines 100 from chamber 401.

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  • Rigid Pipes And Flexible Pipes (AREA)
EP21305648.4A 2021-05-18 2021-05-18 Conduite électrique et procédé de fabrication de la conduite électrique Withdrawn EP4092688A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21305648.4A EP4092688A1 (fr) 2021-05-18 2021-05-18 Conduite électrique et procédé de fabrication de la conduite électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21305648.4A EP4092688A1 (fr) 2021-05-18 2021-05-18 Conduite électrique et procédé de fabrication de la conduite électrique

Publications (1)

Publication Number Publication Date
EP4092688A1 true EP4092688A1 (fr) 2022-11-23

Family

ID=76325452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21305648.4A Withdrawn EP4092688A1 (fr) 2021-05-18 2021-05-18 Conduite électrique et procédé de fabrication de la conduite électrique

Country Status (1)

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EP (1) EP4092688A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117913614A (zh) * 2024-03-19 2024-04-19 西安誉丰通号科技有限公司 一种铁路钢轨引、连接线的制备方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284562A (en) * 1965-02-08 1966-11-08 Dow Corning Flexible electrical conductor
FR2682805A1 (fr) * 1991-10-18 1993-04-23 Peugeot Cable electrique isole resistant a la flexion.
US20100193243A1 (en) * 2007-09-19 2010-08-05 Ken Hotte Electrical transmission cable
WO2011072286A1 (fr) * 2009-12-11 2011-06-16 Keith Leonard March Fils de dispositif biomédical implantable comprenant des conducteurs liquides
EP2735397A1 (fr) 2012-11-23 2014-05-28 Nexans Procédé de connection électrique d'une pièce de contact à un conducteur électrique et système associé
WO2020135319A1 (fr) * 2018-12-27 2020-07-02 深圳市大可奇科技有限公司 Fil électrique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284562A (en) * 1965-02-08 1966-11-08 Dow Corning Flexible electrical conductor
FR2682805A1 (fr) * 1991-10-18 1993-04-23 Peugeot Cable electrique isole resistant a la flexion.
US20100193243A1 (en) * 2007-09-19 2010-08-05 Ken Hotte Electrical transmission cable
WO2011072286A1 (fr) * 2009-12-11 2011-06-16 Keith Leonard March Fils de dispositif biomédical implantable comprenant des conducteurs liquides
EP2735397A1 (fr) 2012-11-23 2014-05-28 Nexans Procédé de connection électrique d'une pièce de contact à un conducteur électrique et système associé
WO2020135319A1 (fr) * 2018-12-27 2020-07-02 深圳市大可奇科技有限公司 Fil électrique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117913614A (zh) * 2024-03-19 2024-04-19 西安誉丰通号科技有限公司 一种铁路钢轨引、连接线的制备方法
CN117913614B (zh) * 2024-03-19 2024-06-04 西安誉丰通号科技有限公司 一种铁路钢轨引、连接线的制备方法

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