EP3416456B1 - Dispositif de chauffage électrique et élément de chauffage ptc pour un tel dispositif de chauffage électrique - Google Patents

Dispositif de chauffage électrique et élément de chauffage ptc pour un tel dispositif de chauffage électrique Download PDF

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Publication number
EP3416456B1
EP3416456B1 EP18177252.6A EP18177252A EP3416456B1 EP 3416456 B1 EP3416456 B1 EP 3416456B1 EP 18177252 A EP18177252 A EP 18177252A EP 3416456 B1 EP3416456 B1 EP 3416456B1
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EP
European Patent Office
Prior art keywords
housing
ptc
heating element
elements
contact
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EP18177252.6A
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German (de)
English (en)
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EP3416456A1 (fr
Inventor
Patrick Kachelhoffer
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Eberspaecher Catem GmbH and Co KG
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Eberspaecher Catem GmbH and Co KG
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/24—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor being self-supporting
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/016—Heaters using particular connecting means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/02—Heaters using heating elements having a positive temperature coefficient
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/022—Heaters specially adapted for heating gaseous material
    • H05B2203/023—Heaters of the type used for electrically heating the air blown in a vehicle compartment by the vehicle heating system

Definitions

  • the present invention relates to an electrical heating device with at least one PTC heating element arranged in a circulation chamber with a heating element housing which adds at least one PTC element and contact sheets that energize the PTC element as a structural unit and is surmounted by contact tongues electrically connected to the contact sheets, and with a partition that separates the circulation chamber from a connection chamber in which the contact tongues of the PTC heating element protruding through the partition are exposed and are electrically connected.
  • Such an electrical heating device is for example from EP 2 607 121 A1 known.
  • a plurality of PTC elements are accommodated in a positioning frame forming the heating element housing, which PTC elements are in contact on opposite main side surfaces with a contact sheet which is latched to the positioning frame.
  • the heating element housing is surmounted by connecting pieces which are integrally formed on the heating element housing and over which sealing sleeves made of Teflon with a labyrinth seal provided on the outer peripheral surface are pulled.
  • insulating layers are applied, which are formed from a plastic film.
  • EP 1 253 808 A1 or. EP 1 395 098 A1 similar PTC heating elements are known.
  • at least one side of the contact sheet and the insulating layer is overmolded during the manufacture of the heating element housing, so that only the PTC elements are inserted into the opening of the frame-shaped heating element housing and covered on the opposite side with the contact sheet and insulation.
  • the present invention aims to provide a PTC element, in particular for the motor vehicle industry.
  • PTC heating elements are increasingly being used. These must be inexpensive to manufacture and as light as possible.
  • a good heat extraction of the heat generated by the PTC element is desired, since the PTC elements have self-regulating properties and are only operated with poor efficiency can, if the heat generated by the PTC element is only insufficiently dissipated.
  • EP 2 440 004 A1 discloses an electrical heating device for heating a liquid medium.
  • a heating element housing is also disclosed, which as such consists of EP 1 921 896 A1 is known and in the electric heater according to EP 2 440 004 A1 is installed.
  • JP H09 82503 A known heating device viewed, which has a two-part outer housing with a ceramic housing shell element and a ceramic housing cover, in which housing a holding part is received, which is positioned at the end of a contact plate and is U-shaped for receiving an elastic foam that positions the other contact plate on the edge and biased against the PTC element.
  • the housing cover is locked to the housing shell element. In another exemplary embodiment, the housing cover is screwed to the housing shell element.
  • the CN 2,867,540 Y discloses a PTC heating element with a rectangular housing made of porcelain with receiving compartments for PTC elements, which rest between contact plates, one of which is formed with spring tongues.
  • the contact plates each form extended contact tongues for electrical connection beyond the actual contact areas, which are passed through slots in a cover 4.
  • the present invention relates in particular to an electrical heating device for a motor vehicle and a PTC heating element of such an electrical heating device.
  • Such components have always been designed to be weight-optimized. Furthermore, due to the high number of units in the motor vehicle industry, it must be ensured that it can be manufactured economically.
  • configurations are also preferred which enable the heat generated in the PTC element to be dissipated as effectively and symmetrically as possible.
  • the present invention is based on the problem of specifying a PTC heating element and an electrical heating device with at least one PTC heating element which allow good heat extraction and are reduced in weight.
  • the first aspect of the present invention proposes a PTC heating element having the features of claim 1.
  • This PTC heating element has a heating element housing which is formed from a housing element and a housing counter element.
  • the heating element housing is formed from these two housing elements alone.
  • the two housing elements usually lie directly against one another. They enclose the PTC element in a sealed manner between them. This means that the two housing elements preferably lie directly against one another and form a sealed interior in which at least the PTC element and the conductor tracks electrically connected to the PTC element are accommodated.
  • the tightness is such that no moisture and also no ambient air gets into the interior of the heating element housing.
  • the heating element housing adds the housing element and the housing counter-element in a structural unit.
  • the heating element housing is usually formed exclusively from the housing element and the housing mating element, which form and enclose the sealed interior.
  • Other structural elements are usually not part of the heating element housing. In particular, there is usually no elastic seal between the both housing elements. Rather, these are joined directly to one another, for example welded or glued. When gluing, the two housing elements are joined with the interposition of an adhesive film which is only applied slightly in the joining area between the two housing elements. So the heating element housing not only encloses the components, but also connects the conductor tracks and the at least one PTC element directly or indirectly to one another.
  • the heating element also inserts the contact tongues, which are connected to the conductor tracks in an electrically conductive manner, so that the conductor tracks can be energized with different polarity via the externally exposed contact tongues.
  • the housing is usually only penetrated by the contact tongues, which penetrate the housing in a sealed manner.
  • the PTC element is sealed in with the conductor tracks solely by the two ceramic housing elements.
  • at least one of the housing elements is preferably designed in the shape of a shell, i.e. forms a recess over which the edges of the housing element protrude and is designed to accommodate the at least one PTC element.
  • the other housing element can be plate-shaped and sealingly connected to the shell-shaped housing element. Both housing elements can equally well be designed in the shape of a shell. For manufacturing reasons, a solution is preferred in which the two housing elements are designed identically and are connected to one another.
  • the two housing elements can be connected by gluing.
  • the adhesive has a relatively poor thermal conductivity compared to ceramic, the adhesive connection for sealing and sealing the two housing elements with one another should lie outside the heat conduction path, which is formed by opposing main side surfaces of the PTC element and penetrates the ceramic housing elements adjacent to it.
  • the main side surfaces of the PTC element are to be understood as those side surfaces which have the largest areal extension. It is assumed that the PTC element has two mutually parallel and opposite main side surfaces that are connected to one another by an annular peripheral surface or polygonal, ie triangular, square or polygonal side edges. The side edges usually extend at right angles to the main side surfaces.
  • the main side surfaces can be provided with a metallization against which the contact tongues rest.
  • the metallization is on the ceramic PTC element vapor-deposited or sputtered.
  • the housing elements form the outer surface, regularly the sole outer surface of the housing element.
  • the medium can be air.
  • the PTC heating element is used in an air heater.
  • the medium can also be a liquid that flows around the heating element housing.
  • the housing element and / or the housing mating element preferably rests at least partially directly on the PTC element.
  • the main side surfaces of the PTC elements are preferably placed solely against the contacting ends of the contact tongues.
  • This connection is preferably an elastic connection in which the current is introduced against the PTC element with a contact spring which is formed as a spring tongue in one piece on a sheet metal strip forming the contact tongue and is applied against the PTC element with elastic pretension.
  • the remaining surface portion of the main side surfaces of the PTC elements is covered directly by the housing element or housing mating element.
  • any configuration in which the ceramic material of the housing element is in contact with the PTC element without any other structural component is understood as a direct contact.
  • This can be provided with a metallization by vapor deposition or the like. This metallization on the surface of the PTC element is assigned to the PTC element itself.
  • An adhesive layer is preferably provided between the housing element and the PTC element.
  • This adhesive layer serves, for example, to compensate for roughness of the PTC element and prevents air inclusions between the surface of the PTC element and the mating surface of the housing element, which can also be due to a certain roughness of the ceramic housing elements.
  • the glue has at least better heat conduction than air. Even though the adhesive layer fills any roughness, it also applies that in such a configuration the housing element or housing mating element rests directly on the PTC element.
  • the housing element or housing mating element and / or the PTC element can have a roughness, the tips of which penetrate the adhesive layer and bear directly on the respective other element.
  • the adhesive is usually supplied volumetrically between a main side surface and the assigned housing element or housing counter element, so that only an amount of adhesive that fills the roughness is supplied, which is dimensioned in such a way that, despite the given roughness, any free spaces between the ceramic housing element and the PTC element are evened out, while the peaks of the roughness continue directly against the ceramic housing element or housing counter-element issue.
  • Epoxy adhesive for example from Polytec with the product name EP 655, is preferably used as the adhesive.
  • the preferred gluing of the PTC element and / or conductor track to the housing element or the housing mating element has the further advantage that during the manufacture of the PTC element according to the invention, the adhesive ensures prepositioning and preassembly.
  • the adhesive can be a highly thermally conductive adhesive. It can be provided with a filler that conducts heat well. It does not necessarily have to be electrically insulating. Pre-positioned in this way, the housing element and the housing counter-element are usually then sealed at the edge, as will be described below.
  • the housing elements are usually produced by means of sintering. Accordingly, the housing elements are contoured with mutually associated joining surfaces.
  • one of the housing elements can be designed in the shape of a shell.
  • Such a housing element can, for example, form a groove or the like that runs around partially or completely and accommodates an edge of the other housing element protruding beyond the contact surface for the PTC element.
  • This groove can be filled with an adhesive, into which the edge is immersed, in order to join the housing element and the housing counter-element and to seal them against one another.
  • the adhesive should be a permanently elastic adhesive so that the desired sealing effect is not lost even if the PTC heating element is used for a long time.
  • the housing element is joined to the housing counter element by means of laser welding.
  • This can be between the housing element and the Counter-housing element a welding aid can be provided, which is melted in the course of the laser welding in order to connect and seal both parts with one another.
  • the housing elements are, however, preferably connected to one another by ceramic laser welding.
  • the weld seam is produced by local melting or partial melting of the ceramic material of at least one of the two housing elements.
  • the weld seam brings about at least one joining and permanent opposing of the two housing elements.
  • the weld seam formed from the ceramic material also preferably seals the two housing elements against one another, so that the receiving space for the PTC element and the conductor tracks are sealed by the ceramic weld seam.
  • a glass paste can also be introduced between the ceramic housing elements, which is melted during laser welding.
  • Such a configuration can be welded tightly at reduced welding temperatures of approximately 600 °.
  • the ceramic material forming the housing element is melted, much higher temperatures of at least 1000 ° C. are required at the phase boundary between the housing element and the housing mating element.
  • the product ESL 4026 or the product ESL 4031-B from ESL Electroscience, King of Prussia, Pennsylvania, USA, for example, can be used as the glass paste.
  • At least one of the housing elements is provided with a flange through which the contact tongues protrude.
  • At least one contact tongue is produced as a contact tongue element separate from the conductor track and inserted into an opening recessed on the flange.
  • the contact tongue element is electrically connected to the associated conductor track, preferably via an elastic spring tongue, which is formed from the material forming the contact tongue element by punching and bending and is in electrically conductive contact with the conductor track.
  • the contact tongues or contact tongue elements can be glued into the flange. If the flange is made from a material other than ceramic, the two housing elements are in sealing contact with the flange. For this purpose, the flange can have a sealing collar over which the housing element or elements overlap.
  • one of the housing elements has a flange which is penetrated by the contact tongues or contact tongue elements and rests in a sealed manner against the other housing element.
  • the aforementioned flange is through one of the housing elements formed itself and is then molded from ceramic.
  • the electrical heating device proposed with the independent aspect of the present invention is defined in claim 8. It has the PTC heating element according to the invention as the PTC heating element. This protrudes through the partition wall at least with the contact tongues and is otherwise preferably inserted in a sealing manner into the partition wall so that fluid contained in the circulation chamber and to be heated cannot get into the connection chamber.
  • the heating device can otherwise according to EP 2 440 004 A1 , EP 1 872 986 A1 or EP 2 607 121 A1 be trained.
  • a printed circuit board with which the preferably several PTC heating elements are grouped into heating circuits, if necessary, and electrically connected to a power supply, possibly with the interposition of a controller for the power current.
  • the solution according to the invention offers the advantage that the heating element housing is formed by ceramic housing elements. These have good thermal conductivity. Incidentally, ceramic material has a relatively low density. The heat conduction path between the PTC element and the outside of the heating element housing is shortened and usually goes solely from the PTC element, possibly through the conductor track and through the associated housing element. With the good thermal conductivity of ceramic, a good heat extraction of the heat generated by the PTC element is guaranteed.
  • the conductor track does not necessarily have to rest in an electrically conductive manner on a main side surface of the PTC element in whole or in part. Rather, electrical contact via the end face of the PTC element is also conceivable. In this case, the heat can be extracted directly via the main side surface, bypassing the conductor track.
  • the PTC heating element 2 shown in the figures has a single PTC element 4, which is received in a shell-shaped housing element 6, which forms a flange 8 which can be inserted sealingly in a recess of a partition (not shown) of an electrical heating device.
  • the flange 8 forms two holding openings 9 extending parallel to the main side surface of the PTC element 4.
  • the flange 8 projects beyond a shell of the housing element 6, identified by reference numeral 10, on both sides and delimits this shell 10 on the front side.
  • the PTC element 4 is inserted into the shell 10.
  • the PTC element 4 has a somewhat greater height than the shell 10. The shell 10 is thus slightly protruded by the PTC element.
  • the housing element 6 can be covered with a counter housing element 12, which is in the Figures 1 and 2 is shown separately from the housing element 6 and the PTC element 4.
  • the housing element 6 as well as the housing element 12 each form a contact tongue receiving chamber 14 in which one of the contact tongues identified by reference numeral 16 can be introduced (cf. Fig. 3 ).
  • the contour of an outer edge of the mating housing element 12 is followed by a contact surface 17 formed by the housing element 6 for the outer edge. This contact surface 17 is partially formed by the flange 8 (cf. Fig. 1 ).
  • the current is introduced into the PTC element 4 via a metallization provided on the outer surface of the PTC element 4, applied to the ceramic material of the PTC element 4 by means of PVC or CVD, which forms a conductor track 18.
  • the conductor track 18 is accordingly provided in one piece with the PTC element 4.
  • an adhesive for example an epoxy adhesive, is usually provided, the roughness on the surface of the PTC element 4 and / or on the inner surface of the housing element 6 or the housing mating element 12 so that the housing elements 6, 12 bear directly on the PTC element 4 over their entire surface.
  • each contact tongue 16 is formed from a separate contact tongue element 20.
  • the contact tongue element 20 has the long sides of the contact tongue 16 protruding cams 22, which are formed by cutting free the sheet metal material of the contact tongue elements 20 and as stops for the contact of the contact tongue element 20 serve against the outer surface of the flange 8.
  • a contact spring 24 is formed by cutting and bending. This contact spring 24 projects beyond the plane of the sheet metal material forming the contact tongue element 20 in the direction of the PTC element 4 (cf. Fig. 3 ).
  • the housing elements 6, 12 are first produced from a ceramic material by pressing and sintering.
  • the flange 8 is formed in one piece on the housing element 6.
  • the housing element 6 is then equipped with the PTC element 4, which for this purpose is inserted into the shell 10, the adhesive having previously been applied to the PTC element 4 and / or the housing element 6.
  • the housing counter element 12 is placed on the housing element 6.
  • adhesive is first applied between the PTC element 4 and the housing counter element 12.
  • the glue first hardens.
  • the housing elements 6, 12 are pressed from the outside against the PTC element 4 in order to fill the given cavities with adhesive due to the roughness at the phase boundary between the PTC element and the housing elements 6, 12 and thus the thermal conductivity of the PTC element 4 in the direction of the housing elements 6, 12 at least over the main side surfaces of the PTC element 4.
  • the adhesive hardens when the pressure is maintained.
  • the housing elements 6, 12 are then connected to one another at the edges by means of ceramic laser welding. Before this, the joining area between the two housing elements 6, 12 can be coated all around with a paste, for example a glass paste. Ceramic laser welding can either be used to melt the material forming the housing elements 6, 12 at the phase boundary between the two housing elements 6, 12 in order to connect the two housing elements 6, 12 to one another in a sealing manner. As an alternative or in addition, the glass paste can also be melted on by laser welding in order to seal the housing elements around the edges.
  • the housing mating element 12 has a web 26 on its edge, which is continuously formed around the circumference of the housing mating element 12.
  • the web 26 engages in a U-shaped groove 28 which is formed on the edge of the housing element 6.
  • the glass paste can be filled in in order to achieve the best possible sealing of the PTC element 4 between the housing elements 6, 12.
  • the PTC element 4 is sealed in between the housing element 6 and the housing counter element 12 with respect to the environment. Only holding openings 9 formed on the flange 8 communicate with the interior of the heating element housing 30 formed by the housing element 6 and the counter-housing element 12.
  • the two contact tongue elements 20 are now inserted through these holding openings 9 and fitted until the respective contact springs 24 are electrically conductive with the metallized outside of the PTC element 6 are connected in that the contact springs 24 rest elastically against the main side surfaces of the PTC element 6.
  • the flange 8 When this PTC heating element is arranged in an electrical heating device, the flange 8 is usually inserted in a sealing manner in a recess in a partition wall which has a circulation chamber into which the PTC element with the corresponding housing elements 6, 12 protrudes from a connection chamber for the electrical connection the contact tongue elements 20 separates.
  • the housing elements 6, 12 can be exposed in the circulation chamber and a liquid medium to be heated flows against them, as is the case, for example, from EP 2 440 004 A1 is known.
  • corrugated rib elements as heat-emitting elements on both sides against the main side surfaces of the housing elements 6, 12 and to insert a heating rod formed in this way into a usually frame-shaped housing for heating the air.

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  • Resistance Heating (AREA)

Claims (11)

  1. Elément de chauffage CTP (2) pour un dispositif de chauffage électrique, comportant un boîtier d'élément de chauffage (28) qui relie au moins un élément CTP (4) et des languettes de contact (16) qui excitent l'élément CTP (4), pour le raccordement électrique de pistes conductrices (18)reliées électriquement à l'élément CTP (4) en tant qu'unité structurelle,
    et comprenant un élément de logement (6) formé d'une céramique et un contre-élément de logement (12) formé d'une céramique,
    caractérisé en ce que
    les deux éléments du boîtier (6, 12) sont en contact étanche l'un avec l'autre et enferment l'élément CTP (4) entre eux de manière étanche et sont dépassés par les languettes de contact (16).
  2. Elément de chauffage PCT selon la revendication 1, caractérisé en ce que l'élément de logement (6) et le contre-élément de logement (12) s'appuient directement l'un contre l'autre pour former un intérieur étanche destiné à recevoir l'élément PTC (4).
  3. Elément de chauffage CTP selon les revendications 1 ou 2, caractérisé en ce qu'au moins l'un de l'élément de logement (6) et du contre-élément de logement (12) est en forme de coque et le logement de l'élément de chauffage (28) est conçu seul comme le logement entourant de manière étanche l'élément CTP (4) et en ce que l'élément de logement (6) et le contre-élément de logement (12) sont directement en butée contre les surfaces latérales principales opposées de l'élément CTP (4) qui évacuent la chaleur.
  4. Elément de chauffage PCT selon les revendications 1 ou 2, caractérisé en ce que l'élément de logement (6) et/ou l'élément d'accouplement de logement (12) s'appuie au moins partiellement directement sur l'élément PTC (4).
  5. Elément de chauffage PTC selon les revendications 1, 2 ou 4, caractérisé en ce qu'au moins un des éléments du boîtier (6, 12) est en forme de coquille.
  6. Elément de chauffage PTC selon l'une des revendications précédentes, caractérisé en ce que l'élément de logement (6) et/ou le contre-élément de logement (12) repose directement sur l'élément PTC (4) avec interposition d'une couche adhésive.
  7. Elément de chauffage PTC selon l'une des revendications précédentes, caractérisé en ce que les éléments du boîtier (6, 12) sont reliés entre eux par une soudure céramique au laser.
  8. Elément de chauffage CTP selon l'une des revendications précédentes, caractérisé en ce qu'un des éléments de boîtier (6, 12) présente une bride (8) à travers laquelle les languettes de contact (16) font saillie, et en ce qu'au moins une des languettes de contact (16) est formée par un élément de languette de contact (20) séparé des pistes conductrices (18) et est insérée dans une ouverture de maintien (9) découpée sur la bride (8) et est reliée électriquement à la piste conductrice associée.
  9. Elément de chauffage PTC selon l'une des revendications précédentes, caractérisé en ce que l'un des éléments de logement (6) forme une bride (8) à travers laquelle les languettes de contact (16) font saillie et contre laquelle l'autre élément de logement (12) repose de manière étanche.
  10. Dispositif de chauffage électrique avec au moins un élément de chauffage CTP (2) disposé dans une chambre de circulation et avec un boîtier d'élément de chauffage (28) qui relie au moins un élément CTP (4) et des languettes de contact (16) qui alimentent l'élément CTP (4) en énergie, en tant qu'unité structurelle, et est surmonté par les languettes de contact (16) reliées électriquement à l'élément CTP (4), et avec une paroi de séparation qui sépare la chambre de circulation d'une chambre de raccordement dans laquelle les languettes de contact (16) de l'élément de chauffage CTP (2) qui dépassent à travers la paroi de séparation sont exposées et reliées électriquement, caractérisé en ce que
    en ce que l'élément de chauffage PTC (2) est conçu selon l'une des revendications 1 à 7.
  11. Dispositif de chauffage électrique selon la revendication 10, caractérisé en ce que l'élément de chauffage CTP (2) est inséré dans la paroi de séparation de manière étanche.
EP18177252.6A 2017-06-13 2018-06-12 Dispositif de chauffage électrique et élément de chauffage ptc pour un tel dispositif de chauffage électrique Active EP3416456B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017209990.9A DE102017209990A1 (de) 2017-06-13 2017-06-13 Elektrische Heizvorrichtung und PTC-Heizelement für eine solche

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Publication Number Publication Date
EP3416456A1 EP3416456A1 (fr) 2018-12-19
EP3416456B1 true EP3416456B1 (fr) 2020-09-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022205705A1 (de) 2022-06-03 2023-12-14 Mahle International Gmbh Heizeinrichtung zum Heizen eines Fluids

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019204665A1 (de) 2019-03-06 2020-09-10 Eberspächer catem Hermsdorf GmbH & Co. KG PTC-Heizelement und eine elektrische Heizvorrichtung
DE102019204472A1 (de) 2019-03-29 2020-10-01 Eberspächer Catem Gmbh & Co. Kg Wärmeerzeugendes Element und elektrische Heizvorrichtung enthaltend ein solches
DE102019205848A1 (de) 2019-04-24 2020-10-29 Eberspächer Catem Gmbh & Co. Kg PTC-Heizelement und elektrische Heizvorrichtung mit einem solchen PTC-Heizelement und Verfahren zur Herstellung eines PTC-Heizelementes
EP3772867B1 (fr) * 2019-08-06 2023-05-03 Eberspächer catem GmbH & Co. KG Dispositif de chauffage électrique et son procédé de fabrication
DE102019217234A1 (de) * 2019-11-07 2021-05-12 Eberspächer Catem Gmbh & Co. Kg PTC-Heizeinrichtung und elektrische Heizvorrichtung mit einer solchen PTC- Heizeinrichtung und Verfahren zur Herstellung einer elektrischen Heizvorrichtung
DE102020205305B4 (de) 2020-04-27 2022-06-30 Eberspächer Catem Gmbh & Co. Kg PTC-Heizeinrichtung und Verfahren zu deren Herstellung
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