Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
  • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
  • G01N27/403—Cells and electrode assemblies
  • G01N27/406—Cells and probes with solid electrolytes
  • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
  • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
  • G01N27/403—Cells and electrode assemblies
  • G01N27/406—Cells and probes with solid electrolytes
  • G01N27/4062—Electrical connectors associated therewith
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
  • H01R4/62—Connections between conductors of different materials; Connections between or with aluminium or steel-core aluminium conductors
  • H01R4/625—Soldered or welded connections
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
  • H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections

Definitions

• the invention relates to an electrical contacting of a sensor element and a method for its production according to the preamble of claims 1 and 8.
• Planar sensor elements for determining the oxygen content in exhaust gases from internal combustion engines require contacting to tap the sensor signal and to supply a heater voltage on the surface.
• the contacts Due to the use of the sensor element in exhaust systems of internal combustion engines, the contacts are exposed to temperatures up to approx. 700 ° C. The contacts must ensure a secure electrical and mechanical connection in this high-temperature range and enable simple and safe handling during production.
• the invention with the characterizing features of the main claim has the advantage that a secure electrical and mechanical connection can be established
• Withstands temperature ranges of at least 700 ° C.
• the contacting is easy to handle in terms of production technology.
• the measures listed in the subclaims represent advantageous developments and improvements of the contacting according to the invention.
• a particularly simple production-related handling of the contact parts is possible if the contact parts are taped to the connection contacts during soldering or welding, that is to say that the individual contact parts are fastened by means of a Metal strip are connected to each other and are separated from the metal strip after soldering or welding.
• a particularly secure connection is created by diffusion welding or diffusion soldering.
• FIGS. 5a to 5d show a manufacturing process Establishing the contact according to FIGS. 2 and 3.
• An electrochemical oxygen sensor 10 is inserted into an exhaust pipe 11 and has a metallic housing part 12 on the measuring gas side and a metallic housing part 13 on the connection side, which together form a housing 14.
• a planar sensor element 16 with a section 17 on the measuring gas side and a section 18 on the connection side is arranged in the housing 14.
• the measuring gas-side housing part 12 is, for example, a tubular element which is open on both sides and in which two shaped ceramic parts 33 and a sealing element 34 made of, for example, steatite powder hold the sensor element 16 gas-tight.
• the sensor element 16 is surrounded on the measuring gas side by a double-walled protective tube 26 with gas openings 27 for the gas inlet and / or gas outlet.
• connection-side housing part 13 is also tubular and has a sealing flange 19. At the measurement gas end, the connection-side housing part 13 is welded gas-tight to the measurement gas side housing part 12 by means of a circumferential weld seam. At the opposite end remote from measuring gas, a tapering section 36 with an opening 37 is embodied on the housing part 13. For example, a metallic jacket tube 38 is welded into the opening 37. In the casing tube 38 are
• Connection cable 40 each with an electrical conductor 41 and a conductor insulation 42 out.
• the conductors 41 of the connecting cables 40 are connected to contact parts 50 (FIG. 2).
• An opening 15 is provided in the exhaust pipe 11, into which a cylindrical connecting piece 21 is welded in a gas-tight manner.
• the connector 21 has an annular surface 22 on which the sealing flange 19 rests.
• a union nut 23 is screwed onto the sealing flange 19 acts and presses it onto the annular surface 22 of the connector 21.
• FIGS. 2 and 3 A first exemplary embodiment of the contact parts 50 is shown in FIGS. 2 and 3.
• the sensor element 16 has on the connection-side section 18 formed on the surface contact points 52 for electrodes, not shown, integrated in the sensor element 16 and for a resistance heater, also not shown and also integrated in the sensor element 16.
• the contact points 52 consist, for example, of a sintered platinum cermet with at least 95% platinum. In the present exemplary embodiment according to FIGS. 2 and 3, four contact points 52 are present, two contact points 52 being present on each side of the sensor element 16.
• the four contact points 52 are each contacted with a contact part 50.
• the contact parts 50 each have a sensor element-side section 55 and a connection-side section 56 and an arc-shaped intermediate piece 57 arranged between them.
• the electrical conductors 41 of the connecting cables 40 are welded to the connection-side section 56.
• the arcuate intermediate piece 57 serves to compensate for thermal and / or mechanical expansions and movements.
• the contact parts 50 consist for example of nickel or a nickel alloy.
• connection-side sections 56 are positioned in accordance with the arrangement of the sensor element-side sections 55, two connection-side sections 56 lying opposite each other.
• the contact parts 50 each have a layer 60 at least on the surface connected to the contact point 52.
• the layer 60 consists of silver, gold, copper or palladium or of an alloy of these metals or of a palladium-nickel alloy.
• the layer thickness of layer 60 is 1 to 50 ⁇ m.
• the layer 60 consists of gold and is electrodeposited, the layer thickness being 1 to 2 ⁇ m.
• FIG. 4 A second exemplary embodiment for realizing the contact parts 50 is shown in FIG. 4.
• two contact parts 50 are also contacted opposite each other with the contact points 52 of the sensor element 16.
• the connection-side sections 56 lie flush with one another here.
• the arrangement of the contact parts 50 according to Figure 4 is chosen so that the positive connection of the electrode and the positive connection of the heating element are not next to each other.
• the integral connection is expediently produced by means of diffusion welding or diffusion soldering. But it is also conceivable that the cohesive
• the layer 60 is a temperature-resistant solder, which is applied for example by plating.
• FIG. 5a shows the sensor element 16 with contact points 52 arranged on the connection-side section 18.
• the contact parts 50 are combined into contact part pairs 65 and connected with a metal band 66, as a result of which a taped supply of the contact parts 50 to the joint is possible.
• the sections 55 of a pair of contact elements 65 on the sensor element side are brought onto the contact points 52 of the sensor element 16 according to FIG. 5c. In this position, the contact parts 50 are integrally connected to the contact points 52.
• the contact part pair 65 is removed from the metal strip 66 on one
• Separation point 67 separated.
• the sensor element 16 is initially only contacted on one side with contact parts 50.
• the contact points 52 on the opposite side of the sensor element 16 are subsequently connected to contact parts 50 in the same way.
• a further possibility of manufacturing the contacting in terms of production technology is that the contact parts 50 are connected to one another in the preassembled state and are formed into at least one pair of contact parts lying opposite one another in such a way that they are able to receive the sensor element with pretension.
• the contact parts 50 prefabricated in this way are pushed onto the sensor element 16, whereby due to the spring action
• Contact parts 50 are pressed onto the contact points 52. This makes it possible to lock the contact parts 50 on the sensor element 16 for the joining method to be carried out.
• the sensor element 60 contacted with contact parts 50 is finally inserted into the measuring gas-side housing part 12 and contacted in the thus installed state with the connecting cables.

Landscapes

• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Health & Medical Sciences (AREA)
• Physics & Mathematics (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Molecular Biology (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• General Physics & Mathematics (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Measuring Oxygen Concentration In Cells (AREA)
• Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7806109

Family Applications (1)

Country Status (6)

Families Citing this family (27)

Family Cites Families (19)

• 1996
  • 1996-09-19 DE DE19638208A patent/DE19638208C2/de not_active Expired - Fee Related
• 1997
  • 1997-06-09 US US09/077,070 patent/US6231348B1/en not_active Expired - Fee Related
  • 1997-06-09 CZ CZ981531A patent/CZ153198A3/cs unknown
  • 1997-06-09 WO PCT/DE1997/001216 patent/WO1998012549A1/de not_active Application Discontinuation
  • 1997-06-09 EP EP97930324A patent/EP0861435A1/de not_active Withdrawn
  • 1997-06-09 JP JP10514125A patent/JP2000500876A/ja active Pending

Non-Patent Citations (1)

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