Catalyst body, electrically heated catalyst and motor vehicle with a catalyst

Abstract

A catalyst body for an electrically heated catalyst has an electrical contacting assembly, which is arranged on the catalyst body and comprises an electrical conductor embedded in the catalyst body and extending in a longitudinal direction of the catalyst body and at least up to one end face of the catalyst body.

Claims

1. A catalyst body for an electrically heated catalyst comprising: at least one electrical contacting assembly comprising an electrical conductor embedded in the catalyst body and extending in a longitudinal direction of the catalyst body and at least up to one end face of the catalyst body, and wherein the electrical conductor runs along a shell surface of the catalyst body or with a distance of less than 10 mm to the shell surface.

2. The catalyst body of claim 1 wherein the electrical conductor protrudes beyond at least one end face of the catalyst body.

3. The catalyst body of claim 1 wherein at least one groove extends in the longitudinal direction in the catalyst body, wherein the electrical conductor is arranged at least partly in the at least one groove.

4. The catalyst body of claim 3 wherein the at least one electrical contacting assembly comprises a surface electrode, wherein the surface electrode at least partly covers the at least one groove.

5. The catalyst body of claim 3 wherein the electrical conductor is adhered in the at least one groove.

6. The catalyst body of claim 1 wherein at least one channel is provided in the catalyst body, wherein the electrical conductor is arranged in the at least one channel.

7. The catalyst body of claim 1 wherein the electrical conductor is elongate.

8. An electrically heated catalyst with the catalyst body as defined in claim 1 and a housing at least circumferentially surrounding the catalyst body, wherein the electrically heated catalyst is electrically contacted on the end face via the at least one electrical contacting assembly.

9. The electrically heated catalyst as defined in claim 8 wherein the catalyst body is surrounded by an insulating mat.

10. A motor vehicle with the electrically heated catalyst as defined in claim 8.

11. A catalyst body for an electrically heated catalyst with at least one electrical contacting assembly, which comprises: an electrical conductor embedded in the catalyst body and extending in a longitudinal direction of the catalyst body and at least up to one end face of the catalyst body, wherein at least one groove extends in the longitudinal direction in the catalyst body, wherein the electrical conductor is arranged at least partly in the at least one groove, wherein the at least one groove is an elongated recess in a shell surface of the catalyst body.

12. A catalyst body for an electrically heated catalyst with at least one electrical contacting assembly, which comprises: an electrical conductor embedded in the catalyst body and extending in a longitudinal direction of the catalyst body and at least up to one end face of the catalyst body, wherein at least one groove extends in the longitudinal direction in the catalyst body, wherein the electrical conductor is arranged at least partly in the at least one groove, and a surface electrode being arranged on the catalyst body, wherein the surface electrode at least partly covers the at least one groove.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages and features of the invention emerge from the following description and the following drawings, to which reference is made. In the drawings there are shown in:

(2) FIGS. 1a and 1b schematically show a catalyst body according to a first embodiment of the invention in a top view and a side view,

(3) FIGS. 2a and 2b schematically show a catalyst body according to a further embodiment of the invention in a top view and a side view,

(4) FIG. 3 shows a catalyst body with a surface electrode, and

(5) FIG. 4 schematically shows an electrically heated catalyst according to the invention.

DETAILED DESCRIPTION

(6) FIGS. 1a and 1b schematically show a catalyst body 12 according to the invention in a top view and a side view, wherein the side view is represented shortened for the sake of simplicity.

(7) The catalyst body 12 is, for example, a honeycomb body, in particular made of ceramic or of metal.

(8) Two contacting assemblies 18, which are offset relative to each other by 180, are provided on a shell surface of the catalyst body 12.

(9) A contacting assembly 18 comprises in each case a surface electrode 20 and an electrical conductor 22.

(10) The electrical conductor 22 is not inherently stable, which means that the conductor 22 does not have any support function.

(11) The surface electrode 20 is arranged directly on the shell surface of the catalyst body 12. In the embodiment example shown, the surface electrode 20 is formed by an electrode paste, for example by a silver paste.

(12) The electrical conductors 22 are embedded in the catalyst body 12 and extend in the longitudinal direction of the catalyst body 12 at least up to the end face of the catalyst body 12. As is shown in FIG. 1b, the electrical conductors 22 can extend beyond an end face 24 of the catalyst body 12.

(13) The electrical conductors 22 are formed elongate, for example rod-shaped or as a wire.

(14) In order to embed the electrical conductors 22 in the catalyst body 12, two grooves 26 extend in the catalyst body 12 in the longitudinal direction of the catalyst body 12. The grooves 26 are arranged offset relative to each other by 180, precisely like the contacting assemblies 18.

(15) An electrical conductor 22 is arranged in each groove 26, namely completely or almost completely inside the groove 26, in such a way that the electrical conductor 22 does not protrude or only minimally protrudes beyond an outer surface of the catalyst body 12.

(16) In order to secure the electrical conductors 22 reliably in the groove 26, the electrical conductors 22 can in each case be adhered in a groove 26, in particular with an electrically conductive adhesive.

(17) Alternatively, the electrical conductors 22 can be secured in the groove 26 by the electrode paste. This is achieved, among other things, in that the surface electrode 20 at least partly covers the groove 26.

(18) FIGS. 2a and 2b illustrate a further embodiment of a catalyst body 12 according to the invention in a top view and a side view.

(19) According to this embodiment, the catalyst body 12 has no groove 26, unlike the previously described embodiment.

(20) In the embodiment represented in FIGS. 2a and 2b, several channels 28 are provided in the catalyst body 12, in particular circumferentially closed channels 28. Exhaust gas flows through these channels 28 during operation of an electrically heated catalyst 10.

(21) In the embodiment example shown, several of these channels 28 are occupied by electrical conductors 22. The electrical conductors 22 extend at least up to the end face 24 of the catalyst body 12, in particular beyond the end face 24, for the purpose of the electrical contacting.

(22) Such a catalyst body 12 can be particularly cost-effective.

(23) The embodiments described in connection with FIGS. 1 and 2 can also be combined with each other.

(24) FIG. 3 shows a catalyst body 12 in which, instead of the surface electrode 20 made of an electrode paste illustrated in FIG. 1, a surface electrode 20 made of a metal plate 38 is illustrated. The metal plate 38 is, for example, adhered to the catalyst body 12. According to a further embodiment, such a surface electrode 20 can be used instead of the surface electrode 20 shown in FIG. 1.

(25) The catalyst bodies 12 shown in FIGS. 1 and 2 can likewise be used in an electrically heated catalyst 10 according to the invention.

(26) Such a catalyst 10 according to the invention with a catalyst body 12 according to FIG. 1 is illustrated in FIG. 4.

(27) The catalyst body 12 is wrapped in an insulating mat 14 and pressed into a housing 16.

(28) Although an embodiment of this invention has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this disclosure. For that reason, the following claims should be studied to determine the true scope and content of this disclosure.