EP3059742A1 - Thermistance ptc - Google Patents

Thermistance ptc Download PDF

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Publication number
EP3059742A1
EP3059742A1 EP16155721.0A EP16155721A EP3059742A1 EP 3059742 A1 EP3059742 A1 EP 3059742A1 EP 16155721 A EP16155721 A EP 16155721A EP 3059742 A1 EP3059742 A1 EP 3059742A1
Authority
EP
European Patent Office
Prior art keywords
ptc thermistor
thermistor element
ptc
heat radiating
heat
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Withdrawn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
EP16155721.0A
Other languages
German (de)
English (en)
Inventor
Ghiani Franco
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.)
Mahle International GmbH
Original Assignee
Mahle International 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 Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP3059742A1 publication Critical patent/EP3059742A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/08—Cooling, heating or ventilating arrangements
    • H01C1/084—Cooling, heating or ventilating arrangements using self-cooling, e.g. fins, heat sinks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
    • H01C1/1406—Terminals or electrodes formed on resistive elements having positive temperature coefficient
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
    • H01C1/144—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors the terminals or tapping points being welded or soldered
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient

Definitions

  • the present invention relates to a PTC thermistor having a PTC thermistor element with a ceramic plate and two opposite major surfaces according to the preamble of claim 1.
  • the invention also relates to a heating device of an air conditioning system of a motor vehicle with such a PTC thermistor.
  • a generic PTC thermistor is known with a PTC thermistor element which is essentially made of a ceramic plate and having a pair of opposite electrodes on the two major surfaces of the PTC thermistor element.
  • heat radiating fins are provided, which are made of metal sheets and connected by a plurality of vertices with the associated, opposite electrodes by soldering. This is intended to achieve improved heating performance due to the improved heat transfer between the PTC thermistor element and the heat radiating elements.
  • heat radiating elements are connected, for example, to heat transfer with electrodes of a PTC thermistor element located on the outside of main surfaces, for example soldered.
  • bonding of the heat radiating elements with the electrodes arranged on the main surfaces of the PTC thermistor element can also take place.
  • a disadvantage of the PTC thermistors known from the prior art is their comparatively complex production, since, for example, first the electrodes are applied to the opposing main surfaces of the PTC thermistor element and then to these in turn the heat radiating element must be glued or soldered. However, the electrodes resting on the main surfaces not only produce an increased installation effort, but also an increased weight and increased costs.
  • the present invention therefore deals with the problem of providing for a PTC thermistor of the generic type an improved or at least one alternative embodiment which overcomes in particular the disadvantages known from the prior art.
  • the present invention is based on the general idea of soldering corresponding heat radiating elements directly onto a main surface of a PTC thermistor element and omitting the electrodes previously provided on the main surface.
  • the PTC thermistor according to the invention in this case has a PTC thermistor element with a ceramic plate with the two opposite major surfaces described above. According to the invention, at least one heat-radiating element is now arranged on at least one of these main surfaces and at the same time is soldered directly onto the main surface of the PTC thermistor element.
  • a PTC thermistor can be created with a significantly reduced installation effort, which is thereby not only less expensive to produce, but also has a lower weight in comparison to known from the prior art PTC thermistors. Due to the direct soldering of the heat radiating elements on the main surface and an optimal heat transfer of the PTC thermistor element can be carried out on the heat radiating elements, without first a still disposed therebetween electrode would have to be heated.
  • the soldering of the heat radiating elements with the associated main surfaces of the PTC thermistor element takes place exclusively by soft soldering at a temperature which is in any case below a harmful for the PTC thermistor elements temperature.
  • a harmless for the PTC thermistor temperature is, for example, at 260 ° C, so that for the solder material, a tin alloy can be used, for example, already melts from about 200 ° C and thus allows a solder joint whose soldering temperature no negative impact on the PTC thermistor element has.
  • the operating temperature in particular the maximum temperature of the PTC thermistor elements during operation, below the melting temperature of the solder material used, so that the solder joint during operation of the PTC thermistor can be solved under any circumstances.
  • the PTC thermistor element and / or the at least one heat-radiating element is / are solder-plated.
  • solder plating not only facilitates the production of the solder joint, for example in a soldering oven, but also allows for a solder-plated PTC thermistor element to provide a surface optimized for heat conduction on the two opposing major surfaces.
  • the PTC thermistor element is solder-plated exclusively in a central region of its main surfaces, in which it is in direct contact with the heat-radiating elements. In this way, in particular, an undesirable current flow or current passage at the longitudinal ends of the PTC thermistor elements can be prevented, wherein the PTC thermistor elements are usually electrically contacting at their longitudinal ends connected to a power source or a control device.
  • the at least one heat-radiating element is designed as a corrugated fin and moreover has gills.
  • gills allow the passage of air, the formation of turbulence, which improve the heat transfer and thus the heating of the medium to be heated.
  • Such gills can be produced efficiently, for example, in simple punching processes, wherein the heat radiating element may have, for example, a wave-shaped, in particular meander-shaped or even zig-zag-shaped contour and is soldered at each adjacent vertex to a major surface of an associated PTC thermistor element.
  • the PTC thermistor element at opposite longitudinal ends of a contact device for electrically contacting each of an electrode and / or for holding in a heat exchanger.
  • the contact device thus fulfills two functions simultaneously, namely once the electrical contacting of the PTC thermistor element, for example, with a power source and on the other hand fixing it in a corresponding frame, which is for example part of a heat exchanger.
  • these contact devices can be designed such that they can be connected to one another, in particular can be inserted into one another, whereby series-connected PTC thermistor elements can be produced.
  • a contact device of a PTC thermistor element as a male part and the second contact device are formed as a female part.
  • the contact device is connected via a clamping connection or a clip connection with the PTC thermistor element.
  • a clamp or clip connection facilitates the installation of the contact device on the PTC thermistor element and also allows by the use of a variety of Contacting a respective adaptation to different frame or heat exchanger.
  • the present invention is further based on the general idea of equipping an automotive air conditioning system with such a PTC thermistor and thereby reducing the disadvantages known from the prior art, such as high assembly costs and high weight.
  • a PTC thermistor 1 has at least one PTC thermistor element 2 with a ceramic plate 3 and two opposing main surfaces 4 and 5 (PTC - Positive Temperature Coefficient).
  • at least one heat-radiating element 6, which is soldered directly to the main surface 4, 5 of the PTC thermistor element 2 is now arranged on at least one main surface 4, 5. Due to the direct soldering of the heat radiating elements 6 to the main surface 4, 5, a previously arranged on the respective main surface 4, 5 electrode can be omitted, which not only brings additional weight, but also a higher assembly costs and thus higher costs.
  • An electrical contacting of the PTC thermistor element 2 takes place via electrodes 7, which either run within the PTC thermistor element 2 or are connected to the same at a narrow edge, that is to say at a narrow longitudinal side thereof.
  • the PTC thermistor element 2 and / or the at least one heat radiating element 6 are / is solder-plated, with the entire main surfaces 4, 5 of the PTC thermistor element 2 being solder-plated, or else only an area 8, in particular, a middle region 8, in which a direct contact with the heat radiating elements 6, in particular their vertices, is given.
  • the at least one heat radiating element 6 can, as in the Fig. 1 to 6 is shown, for example, be designed as a corrugated fin and in addition gills 9 (see. Fig. 2 ) for improved heat transfer, in particular by generating turbulence, have.
  • a contact device 12 (see in particular the Fig. 7 to 10 ) be provided.
  • Such contact means 12 are also in the Fig. 1 and 2 are shown and preferably designed such that they each have a male part and a female part and are thereby connectable to each other, whereby a series of individual PTC thermistor elements 2 is possible.
  • the contact device 12 usually have an electrically conductive part 13 and an insulated part 14, wherein the electrically conductive part 13 has an electrical contacting region 15, via which it is electrically conductively connected to the PTC thermistor element 2 or an electrode 7 the same is connected.
  • the electrically conductive contact region 15 may be formed either as a contact point, as shown in the FIGS. 7 and 10 is shown, or as a parked nose 16, as shown in the 8 and 9 is shown.
  • a connection between the PTC thermistor element 2 and the contact device 12 takes place for example, by a simple sliding, that is a clamp or clip connection.
  • the PTC thermistor 1 In general, with the PTC thermistor 1 according to the invention, a clearer, more cost-effective and, moreover, weight-optimized production can be achieved, since the electrodes previously arranged flat on the main surfaces 4, 5 are now omitted. In addition, an improved heating power can be achieved because the PTC thermistor element 2 emits the heat generated directly to the heat radiating elements 6 and not only need to heat an arranged between the PTC thermistor 2 and the heat radiating element 6 electrode.
  • the maximum operating temperature of such a PTC thermistor 1 is about 170 ° C, that is well below the soldering temperature of soldering the heat radiating elements 6, the main surface 4, 5 of the PTC thermistor element 2 required soldering temperature of about 200 to 230 ° C. Since the PTC thermistor elements 2 withstand temperatures of up to 260 ° C without complaint, the soldering without any impact on the life of the PTC thermistor elements 2 can be done.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
EP16155721.0A 2015-02-20 2016-02-15 Thermistance ptc Withdrawn EP3059742A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015203114.4A DE102015203114A1 (de) 2015-02-20 2015-02-20 PTC-Thermistor

Publications (1)

Publication Number Publication Date
EP3059742A1 true EP3059742A1 (fr) 2016-08-24

Family

ID=55484820

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16155721.0A Withdrawn EP3059742A1 (fr) 2015-02-20 2016-02-15 Thermistance ptc

Country Status (2)

Country Link
EP (1) EP3059742A1 (fr)
DE (1) DE102015203114A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4091267A (en) * 1976-07-19 1978-05-23 Texas Instruments Incorporated Self-regulating electric heater
DE4404345A1 (de) * 1993-02-18 1994-08-25 Valeo Thermique Habitacle Elektrischer Heizradiator, insbesondere für den Fahrgastraum eines Kraftfahrzeuges
DE68917259T2 (de) 1988-11-07 1995-01-05 Ado Electronic Ind Co Ltd Heizvorrichtung mit positivem Temperaturkoeffizienten und Verfahren zur Herstellung davon.
FR2891958A1 (fr) * 2005-10-11 2007-04-13 Schneider Electric Ind Sas Dispositif limiteur de courant, disjoncteur comportant un tel dispositif, et procede limiteur de courant
WO2008061368A1 (fr) * 2006-11-22 2008-05-29 Schukra Of North America, Ltd. Élément chauffant à coefficient de température positif équipé de dissipateurs thermiques
US20140176294A1 (en) * 2012-12-21 2014-06-26 Clark Smith Power resistor with integrated heat spreader

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0320862B1 (fr) * 1987-12-14 1995-02-15 Thermon Manufacturing Company Support pour thermistance chauffante à coefficient de température positif
WO1992006570A1 (fr) * 1990-09-27 1992-04-16 Pct Ceramics Heiz- Und Regeltechnik Gesellschaft M. B. H. Element chauffant electrique auto-regulateur
DE19724734C2 (de) * 1997-06-12 2000-06-29 Behr Gmbh & Co Elektrische Heizeinrichtung, insbesondere für ein Kraftfahrzeug
WO2001028292A2 (fr) * 1999-10-12 2001-04-19 Control Devices, Inc. Reseau auto-regule de generateurs de chaleur a coefficient de temperature positif (ctp)

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4091267A (en) * 1976-07-19 1978-05-23 Texas Instruments Incorporated Self-regulating electric heater
DE68917259T2 (de) 1988-11-07 1995-01-05 Ado Electronic Ind Co Ltd Heizvorrichtung mit positivem Temperaturkoeffizienten und Verfahren zur Herstellung davon.
DE4404345A1 (de) * 1993-02-18 1994-08-25 Valeo Thermique Habitacle Elektrischer Heizradiator, insbesondere für den Fahrgastraum eines Kraftfahrzeuges
FR2891958A1 (fr) * 2005-10-11 2007-04-13 Schneider Electric Ind Sas Dispositif limiteur de courant, disjoncteur comportant un tel dispositif, et procede limiteur de courant
WO2008061368A1 (fr) * 2006-11-22 2008-05-29 Schukra Of North America, Ltd. Élément chauffant à coefficient de température positif équipé de dissipateurs thermiques
US20140176294A1 (en) * 2012-12-21 2014-06-26 Clark Smith Power resistor with integrated heat spreader

Also Published As

Publication number Publication date
DE102015203114A1 (de) 2016-08-25

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