Gas sensor for lithium battery fault detection

Abstract

The utility model discloses a gas sensor for lithium battery fault detection, which comprises a gas sensitive matrix composed of a plurality of gas sensitive elements and a detection cylinder used for bearing the gas sensitive matrix, the detection cylinder is communicated with a gas inlet pipe for transmitting gas to be detected, the periphery of the detection cylinder is provided with gas outlet holes, and the gas outlet holes are communicated with the gas sensitive elements. A gas inlet cylinder communicated with the gas inlet pipe is arranged at the center of the detection cylinder, gas inlet holes are formed in the periphery of the gas inlet cylinder, a plurality of partition plates for separating the gas sensitive elements are arranged between the periphery of the detection cylinder and the periphery of the gas inlet cylinder, one gas sensitive element corresponds to one gas inlet hole and one gas outlet hole, and the gas inlet holes and the gas outlet holes are arranged at intervals of the partition plates; therefore, the plurality of gas sensitive elements are contacted with the to-be-detected gas with the same component content. The problems that in the prior art, gas needing to be detected makes contact with a plurality of gas sensitive elements of a gas sensitive matrix in sequence along the linear direction, the content of some special gas in the gas needing to be detected is continuously reduced along the linear direction, and then the response duration of the subsequent gas sensitive elements is affected are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery safety monitoring technical field, concretely relates to a gas sensor for lithium battery fault detection. BACKGROUND

[0002] The leakage of lithium ion battery electrolyte not only can cause great damage to the environment, but also can cause fire, explosion and other extremely dangerous accidents, so safety monitoring needs to be carried out on lithium battery monomer to realize timely early warning in the failure initial stage, thereby significantly reducing the possibility of accidents. The most effective and rapid way for safety monitoring of lithium battery monomer is the monitoring realized by continuous use of gas detection.

[0003] The mainstream gas detection means includes nuclear magnetic resonance spectrum, gas chromatography mass spectrometry, ion mobility spectrum, electrochemical method and gas sensitive sensor method. Compared with other detection methods, the gas sensitive sensor has the advantages of small volume, low energy consumption, low cost, simple operation and real-time detection. The principle of the gas sensitive sensor is that the gas sensitive element of the gas sensitive sensor adsorbs some special gases in the gas to change the resistance value of itself, so as to realize sensing of the change of the electric signal. The gas sensitive element in the gas sensitive sensor not only adsorbs the gas that has an influence on the resistance of itself, but also adsorbs a small amount of other gases, thereby affecting the sensitivity of the gas sensitive sensor. Therefore, in order to improve the sensitivity of the gas sensitive sensor, the gas sensitive elements made of different gas sensitive materials are often used to form a gas sensitive matrix to detect a plurality of special gases in the gas to be detected, and the change of the resistance value is comprehensively calculated by the calculation module to realize low-error sensing, thereby realizing sensitive monitoring of the running state of the lithium battery monomer.

[0004] The gas sensitive elements of the existing gas sensitive matrix are mostly arranged in a closed detection cylinder. When detecting the special gas in the gas to be detected, the gas to be detected mostly passes through the detection cylinder in a linear manner, and then sequentially contacts a plurality of gas sensitive elements to realize detection of the special gas. The gas sensitive element in the gas to be detected is first contacted, and in addition to the gas with high selectivity that is adsorbed, a certain amount of other special gases are also adsorbed, thereby reducing the content of a certain special gas in the gas to be detected, i.e. reducing the special gas that can be contacted and adsorbed by the subsequent gas sensitive element when the subsequent gas sensitive element contacts the gas to be detected, thereby prolonging the response time of the subsequent gas sensitive element, and further affecting the sensitivity of the gas sensitive matrix. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the problem that in the prior art, the gas to be detected sequentially contacts a plurality of gas sensitive elements of the gas sensitive matrix along a line, thereby continuously reducing the content of some special gases in the gas to be detected along the line, and further affecting the response time of the subsequent gas sensitive element, and provides a gas sensor for lithium battery fault detection.

[0006] The utility model discloses a technical scheme that is adopted to solve the above technical problems, which is a gas sensor for lithium battery fault detection, comprising a gas-sensitive matrix composed of multiple gas-sensitive elements and a detection cylinder for bearing the gas-sensitive matrix, a gas inlet pipe for transmitting the gas to be detected is communicated with the detection cylinder, a gas outlet hole is arranged on the outer periphery of the detection cylinder, a gas inlet cylinder is arranged at the center of the detection cylinder and communicated with the gas inlet pipe, a gas inlet hole is arranged on the outer periphery of the gas inlet cylinder, multiple partition plates for separating the gas-sensitive elements are arranged between the outer periphery of the detection cylinder and the outer periphery of the gas inlet cylinder, and one gas-sensitive element corresponds to one gas inlet hole and one gas outlet hole, and the multiple gas inlet holes and the multiple gas outlet holes are separated by the partition plates to allow the multiple gas-sensitive elements to contact the gas to be detected with the same composition content.

[0007] As a further optimization of the utility model, the gas-sensitive element is made of four different materials.

[0008] As a further optimization of the utility model, one of the gas-sensitive elements is made of tin oxide as a substrate and loaded with metal cobalt or palladium, one of the gas-sensitive elements is made of tin oxide as a substrate and loaded with metal indium or platinum, one of the gas-sensitive elements is made of tungsten trioxide as a substrate and loaded with metal nickel, and one of the gas-sensitive elements is made of tungsten trioxide as a substrate and loaded with metal palladium.

[0009] As a further optimization of the utility model, a positioning groove is arranged in the gas inlet cylinder, and an adsorption plate covering the gas inlet hole is clamped in the positioning groove.

[0010] As a further optimization of the utility model, the detection cylinder is composed of a lower cylinder and an upper cylinder connected by threads, the gas-sensitive element and the gas inlet cylinder are arranged on the lower cylinder, and the upper cylinder is sealingly clamped with the gas inlet cylinder at the center.

[0011] As a further optimization of the utility model, the gas inlet cylinder is threadedly connected with the gas inlet pipe through the detection cylinder.

[0012] As a further optimization of the utility model, a protrusion is arranged in the gas inlet cylinder, the protrusion is conical, and the inclined outer periphery of the protrusion corresponds to the gas outlet hole.

[0013] As a further optimization of the utility model, the gas outlet hole is communicated with an exhaust cylinder fixedly connected with the detection cylinder, and the exhaust cylinder is threadedly connected with a gas outlet pipe.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model discloses a separation board is set up to separate the gas sensitive element of gas sensitive matrix, and makes a gas sensitive element correspond to an air inlet hole and air outlet hole, to make the gas sensitive element of gas sensitive matrix contact the gas of the same gas component content that needs to be detected simultaneously, and further avoid the linear contact gas sensitive matrix of the gas that needs to be detected, because the gas sensitive unit of the front gas sensitive matrix adsorbs a certain amount of special gas, and the sensitivity of the subsequent gas sensitive element is influenced.

[0016] Further, the air inlet hole is arranged at the center of the detection cylinder, and the air outlet hole is arranged at the outer periphery of the detection cylinder, so as to guide the flow direction of the gas to be detected, so that the gas to be detected fully passes through the outer periphery of the gas sensitive element, and the gas sensitive element is kept in full contact with the gas to be detected. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the first cross-sectional structure schematic diagram of the utility model;

[0018] Figure 2 It is the second cross-sectional structure schematic diagram of the utility model;

[0019] Marked in the drawing: 1, exhaust cylinder; 2, detection cylinder; 201, lower cylinder; 202, upper cylinder; 3, separation board; 4, air outlet hole; 5, gas sensitive element; 6, air inlet cylinder; 601, protrusion; 602, adsorption plate; 603, positioning groove; 7, air inlet hole; 8, air inlet pipe; 9, air outlet pipe. DETAILED DESCRIPTION

[0020] In order to better understand the utility model, the content of the utility model is further illustrated below in combination with examples, but the content of the utility model is not limited to the following examples.

[0021] As Figure 2 Shown, a kind of gas sensor for lithium battery fault detection, and prior art same is, including four gas sensitive elements 5 in the detection cylinder 2 of being equipped with, four gas sensitive elements 5 form gas sensitive matrix, air inlet hole 7 and air outlet hole 4 are set to detection cylinder 2, air inlet hole 7 is communicated with air inlet pipe 8, air outlet hole 4 is communicated with air outlet pipe 9, air inlet pipe 8 transports the gas in lithium battery monomer after passing through air inlet hole 7 and sends into detection cylinder 2, i.e. the gas to be detected is sent into detection cylinder 2, and air inlet pipe 8 also heats the gas to be detected in the process of conveying the gas to be detected, to supply gas sensitive matrix to detect special gas in the gas to be detected, to realize the detection to lithium battery monomer state, air outlet pipe 9 is input to lithium battery monomer inside after the gas to be detected of detection, to keep the air pressure balance of lithium battery monomer inside, simultaneously realize the continuous detection to lithium battery monomer.

[0022] As Figure 1 And Figure 2As shown, unlike the prior art, the four gas sensing elements 5 are isolated by the partition plate 3 provided in the detection cylinder 2, and one gas sensing element 5 is provided corresponding to one gas inlet hole 7 and one gas outlet hole 4. The four gas outlet holes 4 are opened on the outer periphery of the detection cylinder 2, and the four gas inlet holes 7 are uniformly opened on the outer periphery of the gas inlet cylinder 6. The outer periphery of the gas inlet cylinder 6 is provided at the center of the detection cylinder 2 and is fixedly connected with the partition plate 3, so that the gas to be detected can simultaneously contact the four gas sensing elements 5 with the same composition content.

[0023] A positioning groove 603 is provided on the inner wall of the bottom of the gas inlet cylinder 6 corresponding to the gas inlet hole 7, and four adsorption plates 602 are provided in the four positioning grooves 603. The four adsorption plates 602 correspond to the four gas inlet holes 7, respectively, to adsorb the gas in the gas to be detected except dimethyl carbonate, methyl ethyl carbonate, carbon monoxide and carbon dioxide, so as to reduce the influence of the gas other than dimethyl carbonate, methyl ethyl carbonate, carbon monoxide and carbon dioxide in the gas to be detected on the gas sensing matrix, thereby improving the detection response time and stability of the four gas sensing elements 5.

[0024] Specifically, the adsorption plate 602 can be made of ZIF-8 material for adsorbing CH4 or H2, or other adsorption materials, as long as it can reduce the gas in the gas to be detected except dimethyl carbonate, methyl ethyl carbonate, carbon monoxide and carbon dioxide, so as to relatively reduce the influence of the gas other than dimethyl carbonate, methyl ethyl carbonate, carbon monoxide and carbon dioxide on the gas sensing matrix.

[0025] The four gas sensing elements 5 are respectively made of the following materials: one, tin oxide as the substrate loaded with metal cobalt or palladium; two, tin oxide as the substrate loaded with metal indium or platinum; three, tungsten trioxide as the substrate loaded with metal nickel; four, tungsten trioxide as the substrate loaded with metal palladium. The gas sensing matrix composed of the above materials has good performance and can stably detect the special gas in the gas to be detected, i.e. dimethyl carbonate, methyl ethyl carbonate, carbon monoxide and carbon dioxide, which are the most content-enhanced volatile gases when lithium battery leaks, so as to improve the detection stability and response time of the operating state of the lithium battery monomer. For details, see Zhu Chaoqi. Gas Sensing Detection and Machine Learning Recognition Method of Lithium Battery Fault Indicator Gas[D]. Huazhong University of Science and Technology, 2023. DOI:10.27157 / d.cnki.ghzku.2023.001319.

[0026] The detection cylinder 2 is composed of the upper cylinder 202 and the lower cylinder 201 which are threadedly connected, the inner wall of the center of the upper cylinder 202 is provided with a circular hole which is sealingly connected with the upper end of the air inlet pipe 8, the outer periphery of the lower cylinder 201 is fixedly connected with the air outlet pipe 9, the inside of the lower cylinder 201 is provided with the partition plate 3, the four gas sensitive elements 5, the air inlet pipe 8 and the air outlet hole 4.

[0027] The air inlet cylinder 6 is threadedly connected with the air inlet pipe 8, the outer periphery of the air outlet hole 4 is provided with the air outlet cylinder 1 which is threadedly connected with the air outlet pipe 9, the air outlet cylinder 1 is fixedly connected with the detection cylinder 2, so that the detection cylinder 2 can be conveniently disassembled and assembled by the workers, so as to realize the replacement and maintenance of the gas sensitive elements 5.

[0028] The end of the air inlet cylinder 6 which faces the air outlet pipe 9 is fixedly provided with the conical convex 601, the inclined surface of the convex 601 can assist the detected gas entering the air inlet cylinder 6 to move to the air inlet hole 7, so as to maintain the stability of the detected gas discharged from the air inlet hole 7.

[0029] The specific embodiments of the utility model are described above. It should be understood that the utility model is not limited to the above specific embodiments, and various modifications or changes can be made by those skilled in the art within the scope of claims, which does not affect the essential content of the utility model.

Claims

1. A gas sensor for lithium battery fault detection, comprising a gas sensitive matrix of a plurality of gas sensitive elements (5) and a detection cartridge (2) for carrying the gas sensitive matrix, the detection cartridge (2) being connected with a gas inlet pipe (8) for transmitting a gas to be detected, characterized in that: The detection cylinder (2) is provided with air outlet holes (4) on the outer periphery, and the center of the detection cylinder (2) is provided with an air inlet cylinder (6) in communication with the air inlet pipe (8), the outer periphery of the air inlet cylinder (6) is provided with air inlet holes (7), and a plurality of partition plates (3) for separating the gas sensitive elements (5) are arranged between the outer periphery of the detection cylinder (2) and the outer periphery of the air inlet cylinder (6), and one gas sensitive element (5) corresponds to one air inlet hole (7) and one air outlet hole (4), a plurality of air inlet holes (7) and air outlet holes (4) are arranged with partition plates (3) in between, so that a plurality of gas sensitive elements (5) can contact the same composition content of the gas to be detected.

2. A gas sensor for lithium battery failure detection as claimed in claim 1, wherein: The gas sensitive element (5) is provided with four, and the four gas sensitive elements (5) are made of different materials.

3. A gas sensor for lithium battery failure detection as claimed in claim 2, wherein: One of the gas sensitive elements (5) is made of tin oxide as a substrate and loaded with metal cobalt or palladium, one of the gas sensitive elements (5) is made of tin oxide as a substrate and loaded with metal indium or platinum, one of the gas sensitive elements (5) is made of tungsten trioxide as a substrate and loaded with metal nickel, and one of the gas sensitive elements (5) is made of tungsten trioxide as a substrate and loaded with metal palladium.

4. A gas sensor for lithium battery failure detection as claimed in claim 1, wherein: The air inlet cylinder (6) is provided with a positioning groove (603) inside, and the positioning groove (603) is clamped with an adsorption plate (602) covering the air inlet hole (7).

5. A gas sensor for lithium battery failure detection as claimed in claim 1, wherein: The detection cylinder (2) is composed of a lower cylinder (201) and an upper cylinder (202) connected by threads, the lower cylinder (201) is provided with gas sensitive elements (5) and an air inlet cylinder (6), and the center of the upper cylinder (202) is sealingly clamped with the air inlet cylinder (6).

6. A gas sensor for lithium battery failure detection as claimed in claim 1, wherein: The air inlet cylinder (6) is threaded through the detection cylinder (2) and connected with the air inlet pipe (8).

7. A gas sensor for lithium battery failure detection as claimed in claim 1, wherein: The air inlet cylinder (6) is provided with a protrusion (601) inside, the protrusion (601) is conical, and the inclined outer periphery of the protrusion (601) corresponds to the air outlet hole (4).

8. A gas sensor for lithium battery failure detection as claimed in claim 1, wherein: The air outlet hole (4) is in communication with an exhaust cylinder (1) fixedly connected with the detection cylinder (2), and the exhaust cylinder (1) is threaded with an air outlet pipe (9).

Images