# US 2014/0190827 A1 · Gas sensor element and gas sensor

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- Number: US 2014/0190827 A1
- Document ID: US20140190827A1
- Status: Published application
- Kind: A1
- Application number: 14/147,135
- Filed: 2014-01-03
- Published: 2014-07-10
- Earliest claimed: 2013-01-08
- Assignees: Ngk Spark Plug Co., Ltd.
- Applicants: Ngk Spark Plug Co., Ltd.
- Inventors: Kentaro KAMADA; Masaki NAKAGAWA; Koji SHIOTANI
- Web page: https://patentgrep.com/patent/US20140190827A1

## CPC

- G01N 27/4071: {using sensor elements of laminated structure}
- G01M 15/104: {using oxygen or lambda-sensors (testing catalytic converters F01N3/18, F01N11/007)}
- G01N 27/4072: {characterized by the diffusion barrier}
- G01N 27/4077: {Means for protecting the electrolyte or the electrodes}
- G01N 27/4078: {Means for sealing the sensor element in a housing}
- G01N 33/0037: {NOx}
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

## Abstract

A gas sensor element which has water-permeable electrodes, and water-impermeable leads connected to the electrodes A first electrode (133) has a space exposure portion (133b) exposed to internal space (160) of a gas sensor element (10) which communicates with an ambient atmosphere. A first lead (137) is connected to the first electrode (133). The first electrode (133) includes a first connection portion (133d) which is disposed at a position not exposed to the internal space (160) and connected to the first lead (137), and which is a portion of the first electrode (133) located most distant from the internal space (160). The entire first connection portion (133d) is located in a region A1 which extends from the internal space (160) over a distance of 1.0 mm or less. Also enclosed is a gas sensor including the gas sensor element.

## Claims

### Claim 1

A gas sensor element configured as a laminate of platelike solid electrolyte bodies, comprising
electrodes provided on front sides or back sides of the solid electrolyte bodies and leads provided on the front sides or the back sides of the solid electrolyte bodies and connected to the electrodes, respectively, wherein
the electrodes include a water-permeable first electrode having a space exposure portion exposed to an internal space of the gas sensor element, the internal space communicating with an ambient atmosphere of the gas sensor element;
the leads include a water-impermeable first lead connected to the first electrode;
the first electrode includes a first connection portion which is disposed at a position not exposed to the internal space and connected to the first lead, and which is a portion of the first electrode located most distant from the internal space; and
the entire first connection portion is located in a region which extends from the internal space over a distance of 1.0 mm or less.

### Claim 2 (depends on 1)

The gas sensor element as claimed in claim 1, further comprising a first insulation layer formed on the front side or the back side of the solid electrolyte body, wherein
the first lead and a portion of the first electrode are formed on the first insulation layer;
the space exposure portion of the first electrode has an electrolyte body contact portion which is in contact with the solid electrolyte body through a through hole extending through the first insulation layer in a laminating direction of the solid electrolyte body; and
the first connection portion of the first electrode is connected to the first lead on the first insulation layer.

### Claim 3 (depends on 1)

The gas sensor element as claimed in claim 1, wherein
the electrodes include a water-permeable second electrode having a porous body contact portion in contact with a porous body having gas permeability and water permeability and exposed to the ambient atmosphere of the gas sensor element;
the leads include a water-impermeable second lead connected to the second electrode;
the second electrode includes a second connection portion which is connected to the second lead at a position located away from the porous body with respect to a planar direction orthogonal to the laminating direction of the solid electrolyte body and which is a portion of the second electrode disposed most distant from the porous body; and
the entire second connection portion is located in a region which extends from the porous body over a distance of 1.0 mm or less.

### Claim 4 (depends on 3)

The gas sensor element as claimed in claim 3, wherein
the gas sensor element has a second insulation layer formed on the front side or the back side of the solid electrolyte body;
the second lead and a portion of the second electrode are formed on the second insulation layer;
the porous body contact portion of the second electrode has an electrolyte body contact portion which is in contact with the solid electrolyte body through a through hole extending through the second insulation layer in the laminating direction; and
the second connection portion of the second electrode is connected to the second lead on the second insulation layer.

### Claim 5

A gas sensor element configured as a laminate of platelike solid electrolyte bodies, comprising
electrodes provided on front sides or back sides of the solid electrolyte bodies and leads provided on the front sides or the back sides of the solid electrolyte bodies and connected to the electrodes, respectively, wherein
the electrodes include a water-permeable third electrode disposed within an internal space of the gas sensor element, the internal space communicating with an ambient atmosphere of the gas sensor element;
the leads include a water-impermeable third lead connected to the third electrode;
the gas sensor element has a third insulation layer formed on the front side or the back side of the solid electrolyte body;
the third lead and a portion of the third electrode are formed on the third insulation layer; and
the third electrode has
an electrolyte body contact portion which is in contact with the solid electrolyte body through a through hole extending through the third insulation layer in a laminating direction of the solid electrolyte body and
a third connection portion connected to the third lead on the third insulation layer within the internal space.

### Claim 6 (depends on 5)

The gas sensor element as claimed in claim 5, wherein
the electrodes include a water-permeable fourth electrode which is in contact with a porous body having gas permeability and water permeability and exposed to an ambient atmosphere of the gas sensor element and which is disposed at such a position that the entirety thereof faces the porous body with respect to the laminating direction of the solid electrolyte body;
the leads include a water-impermeable fourth lead connected to the fourth electrode;
the gas sensor element has a fourth insulation layer formed on the front side or the back side of the solid electrolyte body;
the fourth lead and a portion of the fourth electrode are formed on the fourth insulation layer; and
the fourth electrode has
an electrolyte body contact portion which is in contact with the solid electrolyte body through a through hole extending through the fourth insulation layer in the laminating direction and
a fourth connection portion connected to the fourth lead on the fourth insulation layer at such a position as to face the porous body with respect to the laminating direction.

### Claim 7 (depends on 1)

The gas sensor element as claimed in claim 1, wherein
the gas sensor element detects a concentration of NOx contained in a gas to be measured, and
an electric current flows through the first lead or the third lead according to NOx concentration.

### Claim 8 (depends on 1)

A gas sensor comprising the gas sensor element as claimed in claim 1.

### Claim 9 (depends on 5)

The gas sensor element as claimed in claim 5, wherein
the gas sensor element detects a concentration of NOx contained in a gas to be measured, and
an electric current flows through the first lead or the third lead according to NOx concentration.

### Claim 10 (depends on 5)

A gas sensor comprising the gas sensor element as claimed in claim 5.