EP3618089A2 - Sectionneur de courant pyrotechnique - Google Patents

Sectionneur de courant pyrotechnique Download PDF

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Publication number
EP3618089A2
EP3618089A2 EP19194918.9A EP19194918A EP3618089A2 EP 3618089 A2 EP3618089 A2 EP 3618089A2 EP 19194918 A EP19194918 A EP 19194918A EP 3618089 A2 EP3618089 A2 EP 3618089A2
Authority
EP
European Patent Office
Prior art keywords
signal line
conductor
current isolator
housing
igniter
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.)
Granted
Application number
EP19194918.9A
Other languages
German (de)
English (en)
Other versions
EP3618089A3 (fr
EP3618089B1 (fr
Inventor
Karoline Steinschütz
Markus Marker
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.)
Hirtenberger Automotive Safety GmbH
Original Assignee
Hirtenberger Automotive Safety GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hirtenberger Automotive Safety GmbH filed Critical Hirtenberger Automotive Safety GmbH
Publication of EP3618089A2 publication Critical patent/EP3618089A2/fr
Publication of EP3618089A3 publication Critical patent/EP3618089A3/fr
Application granted granted Critical
Publication of EP3618089B1 publication Critical patent/EP3618089B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H39/00—Switching devices actuated by an explosion produced within the device and initiated by an electric current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H39/00—Switching devices actuated by an explosion produced within the device and initiated by an electric current
    • H01H39/006—Opening by severing a conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0066—Auxiliary contact devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H39/00—Switching devices actuated by an explosion produced within the device and initiated by an electric current
    • H01H2039/008—Switching devices actuated by an explosion produced within the device and initiated by an electric current using the switch for a battery cutoff

Definitions

  • the present invention relates to a pyrotechnic current isolator which has a housing with an igniter which, in order to separate a conductor, pressurizes a separating piston which is displaceable in the housing, a signal line also being interrupted when triggered.
  • Electric and hybrid vehicles BEV and hybrid vehicles are currently seen as a possible solution, with the greatest growth predicted for the latter.
  • the advantage of hybrid vehicles is that a motor / generator element is used for the frequent starting and braking processes, which has a high degree of efficiency when starting and returns the energy to the energy storage when braking.
  • This electricity storage which is small compared to a fully electric vehicle, nevertheless has a very high short-circuit current, which must be reliably switched off in the event of damage.
  • Autokowski uses a magnet in the separating piston for this, which triggers an external magnetic switch.
  • a signal cable is provided in Autoliv's PSS3, which is to be cut in addition to the conductor during the disconnection process.
  • a top plate is provided, which provides a guide for the signal line. Cutting the signal cable is used to prove that the conductor has been cut.
  • the piston has a protruding nose for the signal cable, under which the signal cable is arranged. The signal cable is fixed in the top plate on both sides of the nose.
  • a loop can be attached to the housing with significantly less manufacturing effort. However, with a normal piston - even if it has a nose - there is a risk that the loop will be pressed into the small gap between the piston and the housing and will not be severed. As a result of the pin of the separating piston engaging in the loop, however, this is reliably prevented.
  • the separating device is preferably designed such that the signal line is only cut after the conductor has been separated. In this way it is impossible that "conductor separated" is incorrectly signaled.
  • the piston After severing the conductor and severing the signal line, the piston preferably serves as insulation for both the interrupted conductor and the interrupted signal cable. In this way it is impossible for the signal line to bridge the separation point of the conductor.
  • the signal line has sufficient mechanical stability, i.e. is sufficiently thick, it is often sufficient if the separating piston is only fixed in position by the pin engaging in the loop. Otherwise, it is preferred for fixing the position that the separating piston is positioned relative to the conductor by at least one web.
  • the housing is composed of an upper part and a lower part, the igniter being molded around with the upper part, as is the case with WO 2017/066816 A is known.
  • the electrical connection of the ignition circuit of the current isolator can take place, for example, as a pin type or lead wire variant.
  • the lead of the igniter is also overmolded.
  • the signal line can be formed in one piece.
  • the signal line can be overmolded with the lower part. In this way, the assembly is possible without any problems, because when the lower part is placed on the upper part in which the piston is located, the loop wraps around the piston pin. However, a common plug for the igniter, which is in the upper part, and the signal line, which is in the lower part, is then not possible.
  • the signal line is overmolded with the upper part, the loop emerging from the separating surface to the lower part and being guided between the upper part and lower part to the separating piston.
  • the assembly can be carried out in such a way that the signal line first emerges from the upper part parallel to the direction of movement of the piston, then the piston is inserted, whereupon the loop is bent by 90 ° onto the trend surface between the upper part and lower part and thereby around the pin of the Piston comes to rest. Then the lower part can be attached.
  • a favorable further training is that with this Embodiment the signal line and the igniter have a common connector for connection. This ensures a more economical manufacturing process and is made possible, among other things, by the fact that no additional top plate is required as with PSS3 from Autoliv. It is particularly favorable if the plug is part of the housing.
  • both the signal line and the ignition line emerge from the housing parallel to the conductor level. This is favorable for a space-saving installation and can be used both when the signal line is overmolded in the upper part and when it is overmolded in the lower part.
  • the signal line can have many cross-sectional shapes, but a rectangular cross-section is preferably used. This means that the signal line around the pin comes to rest flat.
  • Fig. 1 a current isolator according to the invention in section
  • Fig. 2 a variant thereof with a different braking of the separating piston
  • Fig. 3 a current isolator with integrated signal line, which is also disconnected when the pyrotechnic switch is triggered, in a section that compared to 1 and 2 is rotated by 90 °
  • Fig. 4 the isolating piston of the current isolator from Fig. 3 in perspective view.
  • a current isolator 1 has a conductor 2 with conductor sections 3a, 3b, the conductor 2 being able to be fixed in the housing through holes 4a, 4b.
  • the housing consists of an upper part 5 and a lower part 6. In the upper part there is an igniter 7 and a separating piston 8 with a groove 9 which contains an O-ring 10.
  • the conductor 2 has two predetermined breaking points 11a, 11b in the interior of the housing, which delimit a central section 12. If this section 12 is separated from the conductor 2, it is also called a circuit board. So far the design corresponds to the existing concepts.
  • circuit board In order to prevent the separated circuit board from coming into contact again, it is necessary for the circuit board to be held in place in the lower part 6 after the current isolator 1 has been triggered.
  • These structural elements can, for example, have a knob-like design.
  • the separating piston 8 preferably has a concave cutting surface, which enables a clean separation of the conductor 2.
  • the conductor 2 has a larger width outside the housing than at the separation points.
  • the upper part 5 and the lower part 6 are held together by screws 13a, 13b, which lead through the conductor 2 and thus not only fix the conductor 2 and hold the housing halves together, but also reinforce them. This means that additional metallic reinforcements can be omitted.
  • insulation 14a, 14b can prevent contact between the screws 13a, 13b and the conductor sections 3a, 3b. This insulation can be part of the upper or lower part 5 or 6 or an independent part.
  • the screws 13a, 13b are particularly preferably inserted from the side remote from the igniter, as a result of which the heads 15a, 15b of the screws 13a, 13b become a structural reinforcement of the lower part 6. As a result, the circuit board 12 punched out by the separating piston 8 during the separating process can be securely caught.
  • the collecting chamber 16 for the circuit board 12 is conical, so that when the circuit board 12 (and possibly the separating piston 8) is braked, a bending moment is generated on the screws 13a, 13b and these serve as structural reinforcement. This bending moment causes the screws to be pressed against the plastic in the transverse direction, which increases their axial holding force. In this design, the screws 13a, 13b can also be inserted from the igniter side.
  • Screws with a plastic thread are preferred as screws. Compared to metric screws, these have a large pitch, significantly more material between the threads and one largely characterized axial loading of the carrier material. Screws with pull-out forces of at least 500 N are particularly preferred.
  • the screws can be equipped with a safeguard against automatic loosening (for example in the event of vibration), for example by serrations or ribs on the screw head.
  • the screws on the head can have a contour for transmitting the screwing-in and tightening torque, which becomes ineffective when a defined torque is reached, for example by tearing off part of the head. This effectively prevents disassembly.
  • a seal 17 is provided, this is particularly preferably sprayed onto the conductor 2 and consists of conventional sealing materials, for example EPDM or TPE with approximately 70 Shore, the fixing of the conductor sections 3a also helps here , 3b during and after the separation process by the screws 13a, 13b to ensure tightness.
  • Fig. 2 A further design is shown in which the separating piston 8 is designed as a stepped piston and the position of the predetermined breaking points 11a, 11b and the diameter of the collecting chamber 16 are adapted to the smaller diameter 19 remote from the igniter.
  • the smaller diameter 19 remote from the igniter separates the central section 12 of the conductor 2 from the conductor 2 when the igniter 7 is activated, the conductor sections 3a, 3b subsequently serving to limit the distance for the separating piston 8 and therefore the fixing of the conductor ends by the screws is particularly cheap.
  • the step of the piston is oblique (frustoconical), forces act on the conductor sections 3a, 3b in their longitudinal direction, as a result of which the screws are again pressed laterally against the plastic.
  • a current isolator 1 of the type described above can also be equipped with an additional isolating device for a signal line 18, as shown in FIG Fig. 3 is shown.
  • This additional separating device generally becomes effective only after the conductor 2 has been separated in order to document the separation process and to initiate any subsequent steps.
  • a separating piston 8 according to the invention in combination with the signal line 18 is shown in Fig. 4 shown.
  • the separating piston 8 has a predetermined orientation to the conductor 2, which is ensured in the exemplary embodiment by tabs 16a, 16b.
  • the signal line 18 has two ends 19a, 19b and a separating area 20.
  • a pin 21 of the separating piston 8 engages in the separating area 20 of the signal line 18.
  • the igniter 7 is ignited, the separating piston 8 separates the central section 12 of the conductor 2, and the pin 21 of the separating piston 8 tears through the signal line 18.
  • the geometry of the separation area of the signal line 18 and the pin 21 is designed such that the conductor 2 is disconnected first and then the signal line 18 is separated.
  • An embossed signal line 18 provides a more precise definition of the tear point.
  • the separating piston 8 ensures the insulation between the conductor 2 and the signal line 18 before, during and after the separation process.
  • the assembly is particularly advantageous in that the conductor loop of the signal line 18 protrudes downward from the upper part 5 after the encapsulation, the separating piston 8 with the O-ring 10 is inserted and the conductor loop of the signal line 18 on the interface between the upper part 5 and the lower part 6 and over the pin 21 of the separating piston 8 is bent, after which the lower part 6 is placed and screwed on.
  • the signal line can be made in one piece.
  • the signal line is a wire or a strand, which preferably has no insulation in the separation area and is also injected into the housing.
  • the igniter 7 and the ignition line are also injected in the upper part, it is particularly advantageous if the signal line 18 is also injected in the housing, specifically in the lower part 6.
  • the cables of the ignition line leave the upper part 5 parallel to the conductor level
  • the cables of the signal line 18 leave the lower part 6 also parallel to the conductor level, particularly preferably the ignition line and the signal line exit in the same direction.
  • a connector can also be attached here.
  • the watertightness of this system can be achieved by a sealing ring - as shown above - mostly in combination with a (four-pin) waterproof connector or two (two-pin) waterproof connectors.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Air Bags (AREA)
  • Automotive Seat Belt Assembly (AREA)
EP19194918.9A 2018-09-02 2019-09-02 Sectionneur de courant pyrotechnique Active EP3618089B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA50748/2018A AT521345B1 (de) 2018-09-02 2018-09-02 Pyrotechnischer Stromtrenner

Publications (3)

Publication Number Publication Date
EP3618089A2 true EP3618089A2 (fr) 2020-03-04
EP3618089A3 EP3618089A3 (fr) 2020-03-11
EP3618089B1 EP3618089B1 (fr) 2021-04-14

Family

ID=67840987

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19194918.9A Active EP3618089B1 (fr) 2018-09-02 2019-09-02 Sectionneur de courant pyrotechnique

Country Status (2)

Country Link
EP (1) EP3618089B1 (fr)
AT (1) AT521345B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023124512A1 (de) * 2023-09-12 2025-03-13 Bayerische Motoren Werke Aktiengesellschaft Pyrotechnische Abschalteinrichtung für ein mehradriges Stromkabel eines Hochvoltbordnetzes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004023415A1 (de) 2003-07-29 2005-03-31 Dynamit Nobel Ais Gmbh Automotive Ignition Systems Pyrotechnisch angetriebene Trennvorrichtung zum Trennen von massiven, kompakten Materialien
WO2012025272A1 (fr) 2010-08-27 2012-03-01 Auto-Kabel Managementgesellschaft Mbh Dispositif de séparation électrique et procédé de séparation électrique d'éléments de raccordement à l'aide d'un dispositif de séparation
WO2017066816A1 (fr) 2015-10-19 2017-04-27 Hirtenberger Automotive Safety Gmbh & Co Kg Dispositif de séparation pyrotechnique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10111252A1 (de) * 2001-03-09 2002-09-26 Daimler Chrysler Ag Anordnung zum Schutz von Vebrauchern
DE102010045726B4 (de) * 2010-09-07 2013-01-10 Fele Gmbh & Co. Kg Sicherungsvorrichtung und Verfahren zur Herstellung einer Sicherungsvorrichtung
DE102012013491B3 (de) * 2012-07-09 2013-09-26 Auto-Kabel Managementgesellschaft Mbh Elektrische Trennvorrichtung mit Sensorüberwachung
DE102017207736B3 (de) * 2017-05-08 2018-08-23 Leoni Bordnetz-Systeme Gmbh Pyrotechnischer Schutzschalter und Versorgungsnetz mit einem pyrotechnischen Schutzschalter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004023415A1 (de) 2003-07-29 2005-03-31 Dynamit Nobel Ais Gmbh Automotive Ignition Systems Pyrotechnisch angetriebene Trennvorrichtung zum Trennen von massiven, kompakten Materialien
WO2012025272A1 (fr) 2010-08-27 2012-03-01 Auto-Kabel Managementgesellschaft Mbh Dispositif de séparation électrique et procédé de séparation électrique d'éléments de raccordement à l'aide d'un dispositif de séparation
WO2017066816A1 (fr) 2015-10-19 2017-04-27 Hirtenberger Automotive Safety Gmbh & Co Kg Dispositif de séparation pyrotechnique

Also Published As

Publication number Publication date
AT521345B1 (de) 2020-01-15
EP3618089A3 (fr) 2020-03-11
AT521345A4 (de) 2020-01-15
EP3618089B1 (fr) 2021-04-14

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