EP3251141B1 - Élément de sécurité pyrotechnique - Google Patents

Élément de sécurité pyrotechnique Download PDF

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Publication number
EP3251141B1
EP3251141B1 EP16702335.7A EP16702335A EP3251141B1 EP 3251141 B1 EP3251141 B1 EP 3251141B1 EP 16702335 A EP16702335 A EP 16702335A EP 3251141 B1 EP3251141 B1 EP 3251141B1
Authority
EP
European Patent Office
Prior art keywords
conductor
safety element
pyrotechnic
housing
triggering
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.)
Not-in-force
Application number
EP16702335.7A
Other languages
German (de)
English (en)
Other versions
EP3251141A1 (fr
Inventor
Martin Burger
Peter Steiner
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.)
Leoni Bordnetz Systeme GmbH
Original Assignee
Leoni Bordnetz Systeme 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 Leoni Bordnetz Systeme GmbH filed Critical Leoni Bordnetz Systeme GmbH
Publication of EP3251141A1 publication Critical patent/EP3251141A1/fr
Application granted granted Critical
Publication of EP3251141B1 publication Critical patent/EP3251141B1/fr
Not-in-force 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
    • H01H39/006—Opening by severing a conductor
    • 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 invention relates to a pyrotechnic securing element, in particular for the motor vehicle sector, comprising a conductor, a pyrotechnic unit with a pyrotechnic propellant charge, a separating body for cutting through the conductor and a housing.
  • fuses are typically integrated into the current paths, which melt or melt when an overcurrent occurs and thereby disconnect the corresponding current path or the corresponding current paths from the energy supply.
  • pyrotechnic fuse elements are used in the automotive field, which do not serve to avoid overcurrents, but by an ignition signal, ie an active control, triggered when a predetermined condition, the so-called trigger condition is met.
  • a pyrotechnic safety element also known as a pyrotechnic safety switch, pyrotechnic switch or pyrotechnic separator, is a type of emergency stop switch of stop category 0 (EN ISO 13850: 2008 pt. 4.1.4 and EN 60204-1: 2006 clause 9.2 .2), which can be triggered manually in principle and / or automatically controlled under the predetermined trigger condition and thereby triggered.
  • a corresponding pyrotechnic fuse element is constructed according to a known principle and includes a pyrotechnic propellant, which is connected by an electrical ignition signal, for example, a sensor signal of a connected Sensor is ignited and as a result a separator body, means a wedge or a bolt accelerated, so that this mechanically cuts an electrical conductor.
  • an electrical ignition signal for example, a sensor signal of a connected Sensor is ignited and as a result a separator body, means a wedge or a bolt accelerated, so that this mechanically cuts an electrical conductor.
  • pyrotechnic security elements are usually used as a so-called battery disconnect switch which disconnects the battery or the accumulator of the motor vehicle from the rest of the electrical system of the motor vehicle in the event of a traffic accident and thus virtually isolated. This prevents that accidentally exposed and / or damaged electrical cable connections or exposed and / or damaged electronic components pose a risk, especially for rescue workers, so for example. Ignite leaking oil or gasoline.
  • EP-A-1710871 discloses a fuse element according to the preamble of claim 1.
  • the object of the invention is to provide an advantageously designed pyrotechnic securing element.
  • a corresponding pyrotechnic securing element is designed in particular for the motor vehicle sector and comprises a conductor, a pyrotechnic unit, a separating body and a housing.
  • the conductor is formed by two separate conductor sections, which are connected to one another at a connection point and are separated again in the case of release by the separating body at the connection point.
  • connection is designed such that the forces to be applied for a separation are significantly lower than the forces which are to be applied in order to cut through a solid conductor.
  • a pyrotechnic fuse element preferably has a pyrotechnic unit that converts a reduced amount of energy when triggered.
  • each conductor section is further formed by a conductor strip or sheet metal strip and, for example, made of copper, for example CU-ETP, a copper alloy, aluminum or an aluminum alloy.
  • connection of the two conductor sections is preferably application-dependent, ie. also in dependence of the material used for the conductor sections, wherein the connection is in any case designed such that the forces to be applied for the separation are specified as accurately and appropriately as possible.
  • connection is designed such that it is ensured that after triggering of the pyrotechnic securing element not only the connection between the two conductor sections is broken, but the two conductor sections are also sufficiently far apart spatially separated, so that neither due to contact nor as a result Rollover current flows over the two conductor sections.
  • the two conductor sections are preferably formed as sheet metal strips, wherein the ends rest on each other, so that they overlap and in the Touch the end area or overlap area flat. In this way it is ensured that the contact resistance between the two conductor sections is relatively small, as long as the connection between the two conductor sections is intact.
  • connection of the two conductor sections by means of clinching also called clinching, this being suitably used as sheet metal strip conductor sections are used.
  • clinching also called clinching
  • These are then advantageously arranged for the process of clinching, such that one end of one conductor strip rests on one end of the other conductor strip so that the respective ends overlap, and it is precisely in this region in which the two ends overlap that occurs Connection of the two conductor strips by clinching.
  • the two correspondingly arranged conductor sections are typically arranged between a so-called die and a die, and the connection between the conductor sections is then produced by moving the die and the die toward one another.
  • the stamp is, for example, cylindrically shaped and the die has a cylindrical recess with dimensions enlarged relative to the punch, so that the cylindrical shape of the punch can be driven at least partially into the cylindrical recess of the die during clinching and between the cylindrical shape of the punch and the cylindrical Deepening of the die still enough space for material of the two conductor sections is given.
  • the metal strips or conductor strips have a sheet thickness or plate thickness between 0.4 mm and 1.2 mm and when the conductor cross section is greater than 10 mm 2 .
  • the separating body has, for example, a wedge shape
  • the two conductor sections are formed as sheet metal strips, which rest on each other in the region of the junction, it is expedient to specify for the separator in the event of triggering a movement such that it is driven between the two superimposed conductor sections and thereby separates the two conductor sections spatially from each other .
  • the separator it is advantageous if that end of the conductor section to which the separating body moves in the event of a trigger, bent away from the other conductor section, so to speak, is bent, so that the separator forced in the case of release under the weg- or bent end of the corresponding conductor section and driven between the two conductor sections.
  • the separating body is wedge-shaped in this case, the connection between the two conductor sections is separated in the case of release, in that the separating body lifts or shears off a conductor section from the other conductor section.
  • two strip-shaped conductor sections are then aligned along a common axis and arranged so that they adjoin one another in a longitudinal direction.
  • the separating body moves in the case of release in the longitudinal direction to separate the two conductor sections from each other.
  • one end of the one conductor strip lies on one end of the other conductor strip on, so that the two ends overlap partially and lie flat on each other.
  • a wedge-shaped separating body On one of the two strip-shaped conductor sections then in particular a wedge-shaped separating body is positioned, which in case of release, for example, slidably along the corresponding conductor section in the direction of the connection point, ie in the direction of the area in which the two ends of the two conductor sections rest on one another, moves or rather, it is driven in the appropriate direction.
  • the separating body For reliable guidance of the separating body, it is preferably mounted in a slidable manner with a guide element on the one conductor section.
  • the guide element is designed in particular as a guide strip arranged, for example, laterally on the conductor section, or comprises at least one such guide rail.
  • the two conductor sections are secured together so that they form an angular shape and are accordingly not arranged along a common axis.
  • a separating body made of plastic for example of polyoxymethylene (POM) is preferably used.
  • the housing is preferably made of a plastic, in which case, for example, polyamide (PA) or polybutylene terephthalate (PBT) is used.
  • the housing is advantageously kept simple, in particular, to keep the final assembly, so the composition of the prefabricated items to the pyrotechnic fuse element, simple.
  • the housing is constructed of exactly two housing parts, namely a side wall and a housing base, in which a housing shell and a housing cover are connected to one another via a hinge, in particular a film hinge.
  • Those housing base which typically surrounds most of the remaining components of the pyrotechnic securing element in the final assembled state, is more preferably closed during the final assembly and in particular hermetically sealed, for example by welding the housing shell and the housing cover together, for example on the side opposite the film hinge. This ensures that the generated in the case of release by means of the pyrotechnic propellant charge of the pyrotechnic fuse element pressure can be used substantially completely to accelerate the separator and can not escape the quasi unused out of the case.
  • a holding element is preferably formed on at least one conductor section, which is designed for example as a material recess, on which the housing is locked in the final assembled state by positive locking.
  • the final assembly should be kept as simple as possible and in addition to the conductor sections also a signal line through the housing is led to the outside, via which an ignition signal in the case of triggering the pyrotechnic propellant charge of the pyrotechnic unit is transmitted, is according to a further advantageous Embodiment of the pyrotechnic fuse element, the pyrotechnic unit, molded with plastic, and in particular such that just this Kunststoffumspritzung forms the side wall of the housing.
  • the plastic extrusion coating is, for example, annular and, in the final assembled state, preferably connected by positive engagement with the housing base or fastened to the housing base. In the simplest case, this is formed on the housing base of a groove which is positioned with closed housing base on the housing base inside and is preferably configured as a circumferential groove.
  • the pyrotechnic propellant charge of the pyrotechnic unit is preferably adapted to the reduced requirements and accordingly made smaller and weaker. In particular, this makes it possible to realize a total of a relatively compact pyrotechnic securing element and also for this reason, a pyrotechnic securing element presented here is also used and installed in so-called fuse boxes.
  • Corresponding pyrotechnic security elements are thus not only intended to isolate the installed batteries or accumulators in a motor vehicle when triggered, ie in particular in the case of a traffic accident, and from disconnect other electrical system, but also to isolate individual modules or electrical systems in the case of triggering within the rest of the electrical system, which is particularly advantageous if, for example, energy buffers are integrated into the electrical system, so for example, capacitors, could be triggered by their discharge also accident consequential.
  • FIG. 1 An example described below and in Fig. 1 shown in a perspective view pyrotechnic fuse element 2 has a first conductor section 4 and a second conductor section 6, which are connected to one another at a junction 8.
  • the first conductor section 4 is part of a not fully illustrated with power distribution plate or a bus bar, which is or which is installed in a so-called fuse box of a motor vehicle. In this case, it forms a connecting arm of the distributor plate and thus serves either as an input current path or as an output current path, which is connected via the distributor plate to other connection arms and thus to other current paths of the electrical system of the motor vehicle.
  • Fig. 2 shows, the two strip-shaped conductor sections 4,6 are arranged along a common connecting axis 10, in such a way that one end 12 of the second conductor section 6 rests on one end 12 of the first conductor section 4, so that the two ends 12 overlap and in Touch surface of joint 8 flat.
  • a clinching 14 is formed for the mechanical connection of the two conductor sections 4,6, which is produced in the context of a clinching process by means of a cylindrical punch and a die.
  • the wedge-shaped front of the separating body 16 reaches the end 12 of the second conductor section 6, which has a kind of bent tab 20 in the end region facing away from the first conductor section 4 and together with this an angular attack 22 for wedge-shaped front of the separator 16 forms.
  • the separating body 16 is securely driven under the second conductor section 6 and thus between the two conductor sections 4,6.
  • the separating body 16 peels off the end 12 of the second conductor section 6, as it were, from the first conductor section 4 and thus eliminates the mechanical connection between the two conductor sections 4, 6.
  • the wedge-shaped front of the separating body 16 has a plurality of geometric partial shapes, which differ from each other in terms of their function.
  • two main wedges 24 are arranged on the sides, which break the connection between the two conductor sections 4, 6 and are guided past the penetration joint 14 or rather at the position of the clinching joint 14 in the course of the movement of the separation body 16.
  • a substantially flatter designed auxiliary wedge 26 is positioned downstream of the main wedges 24 and serves primarily to separate the two conductor sections 4,6 after dissolving the compound, in particular in the region of the clinching 14 spatially separated and separated to keep.
  • this ignition signal is generated in an airbag control unit of the motor vehicle, not shown, and fed via a signal line 30 and plug contacts to the pyrotechnic unit 28 in the pyrotechnic unit 28.
  • the ignition signal is generated, which ignites the pyrotechnic propellant charge in the pyrotechnic unit 28.
  • Fig. 1 shows the pyrotechnic fuse element 2 further comprises a housing 32 which is fixed in the final assembled state by means of four notches 34 on the interconnected conductor sections 4,6 and includes the connection point 8 together with the separating body 16 and the pyrotechnic propellant charge.
  • the housing 32 is designed in two parts and consists of a housing base 36, which in Fig. 5 is shown, and a side wall 38 which is formed by a plastic extrusion on the pyrotechnic unit 28.
  • housing wall 38 is quasi as a sealing ring in a groove on the inside of the housing base 36, so that in this way the side wall 38 is positively connected to the housing base 36.
  • the housing base 36 in turn has a housing shell 40 and a housing cover 42, which are connected to each other as part shapes of the housing base 36 via a film hinge 44.
  • the housing shell 40 is then placed over the interconnected conductor sections together with the separator and the pyrotechnic unit 28, at least up to the side wall 38, and then the housing cover 42 is closed and welded on the film hinge 44 opposite side.
  • Fig. 5 It can be seen that the housing 32 forms together with the conductor sections 4,6 lateral receptacles 46 for the guide rails 18 of the separating body 16, which in the case of triggering a very precise guidance of the separating body 16 in the manner of a rail guide condition.
  • the in Fig. 3 recognizable sealing ring 48 is not intended to contribute to the leadership of the separator 16, but primarily to use the triggering case generated by the pyrotechnic propellant charge increase in the area behind the separator 16 as completely as possible to accelerate the separator 16 and preferably not about any Let openings or gaps escape unused.
  • Fig. 6 is still an alternative embodiment of the connection between the two conductor sections 4,6 shown schematically.
  • the conductor sections 4,6 are bent or angled in the end region and the separating body 16 is driven perpendicular to the connecting axis between the two end regions of the two conductor sections 4,6.

Landscapes

  • Air Bags (AREA)
  • Fuses (AREA)

Claims (12)

  1. Élément fusible (2) pyrotechnique, notamment pour le secteur de l'automobile, comprenant un conducteur (4, 6), une unité pyrotechnique (28) dotée d'une charge propulsive pyrotechnique, un corps de séparation (16) destiné à sectionner le conducteur (4, 6) ainsi qu'un boîtier (32),
    le conducteur (4, 6) étant formé par deux pièces partielles de conducteur (4, 6) réalisées sous la forme de bandes de tôle (6) qui sont reliées entre elles par façonnage au niveau d'un point de liaison (8) et qui, en cas de déclenchement, sont de nouveau séparées au niveau du point de liaison (8) par le corps de séparation (16),
    caractérisé en ce les pièces de conducteur sont disposées le long d'un axe commun, de sorte qu'elles se raccordent l'une à l'autre dans une direction longitudinale,
    le corps de séparation (16), en cas de déclenchement, se déplaçant dans la direction longitudinale le long de cet axe (10) commun afin de séparer les deux pièces partielles de conducteur (4, 6) l'une de l'autre.
  2. Élément fusible (2) selon la revendication 1, caractérisé en ce qu'une extrémité (12) d'une bande de tôle (6) repose sur une extrémité (12) de l'autre bande de tôle (4), de sorte que les deux extrémités (12) se chevauchent.
  3. Élément fusible (2) selon l'une des revendications 1 à 2, caractérisé en ce que les deux pièces partielles de conducteur (4, 6) sont reliées l'une à l'autre par assemblage par interpénétration (14) .
  4. Élément fusible (2) selon l'une des revendications 2 à 3, caractérisé en ce que les deux bandes de tôle (4, 6) sont reliées l'une à l'autre de telle sorte qu'au moins une extrémité (12) d'une bande de tôle (6) fait saillie au-dessus du point de liaison (8) et forme ainsi une projection (20) au niveau de laquelle est appliqué le corps de séparation (16) en cas de déclenchement.
  5. Élément fusible (2) selon la revendication 4, caractérisé en ce que la projection (20) est relevée de sorte que le corps de séparation (16) est appliqué au-dessous de la projection (12) en cas de déclenchement.
  6. Élément fusible (2) selon l'une des revendications 1 à 5, caractérisé en ce que les deux pièces partielles de conducteur (4, 6) sont fixées l'une contre l'autre de telle sorte qu'elles forment ensemble une forme angulaire.
  7. Élément fusible (2) selon l'une des revendications 1 à 6, caractérisé en ce que le corps de séparation (16) est de configuration cunéiforme et, en cas de déclenchement, sépare la liaison entre les deux pièces partielles de conducteur (4, 6) en ce que celui-ci soulève une pièce partielle de conducteur (6) de l'autre pièce partielle de conducteur (4).
  8. Élément fusible (2) selon l'une des revendications 1 à 7, caractérisé en ce que le corps de séparation (16) est fabriqué en une matière plastique.
  9. Élément fusible (2) selon l'une des revendications 1 à 8, caractérisé en ce que le boîtier (32) possède exactement deux parties de boîtier (36, 38), à savoir une paroi latérale (38) et une base de boîtier (36), avec lequel une coque de boîtier (40) et un couvercle de boîtier (42) sont reliés entre eux, notamment par le biais d'une charnière à film (44).
  10. Élément fusible selon l'une des revendications 1 à 9, caractérisé en ce qu'au moins un évidement de matière (34) servant à la fixation du boîtier (32) est formée au niveau d'au moins une pièce partielle de conducteur (4, 6).
  11. Élément fusible selon la revendication 9 ou 10, caractérisé en ce que l'unité pyrotechnique (28) passe à travers la paroi latérale (38), l'unité pyrotechnique (28) étant surmoulée de matière plastique pour la formation de la paroi latérale (38).
  12. Coffret à fusibles pour un véhicule automobile, comprenant un élément fusible (2) pyrotechnique selon l'une des revendications précédentes.
EP16702335.7A 2015-01-27 2016-01-13 Élément de sécurité pyrotechnique Not-in-force EP3251141B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015201371.5A DE102015201371A1 (de) 2015-01-27 2015-01-27 Pyrotechnisches Sicherungselement
PCT/EP2016/050495 WO2016120062A1 (fr) 2015-01-27 2016-01-13 Élément de sécurité pyrotechnique

Publications (2)

Publication Number Publication Date
EP3251141A1 EP3251141A1 (fr) 2017-12-06
EP3251141B1 true EP3251141B1 (fr) 2018-11-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16702335.7A Not-in-force EP3251141B1 (fr) 2015-01-27 2016-01-13 Élément de sécurité pyrotechnique

Country Status (4)

Country Link
US (1) US10529516B2 (fr)
EP (1) EP3251141B1 (fr)
DE (1) DE102015201371A1 (fr)
WO (1) WO2016120062A1 (fr)

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AT525886B1 (de) 2022-07-05 2023-09-15 Miba Sinter Austria Gmbh Sicherheitsschalter

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Also Published As

Publication number Publication date
DE102015201371A1 (de) 2016-07-28
EP3251141A1 (fr) 2017-12-06
WO2016120062A1 (fr) 2016-08-04
US20170323747A1 (en) 2017-11-09
US10529516B2 (en) 2020-01-07

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