CN111426660A - Preparation method of gas detection sensor and lithium ion battery gas detection system - Google Patents
Preparation method of gas detection sensor and lithium ion battery gas detection system Download PDFInfo
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application relates to a preparation method of a gas detection sensor and a lithium ion battery gas detection system. The preparation method of the gas detection sensor comprises the step of depositing gold nanoparticles on the surfaces of the microspheres to prepare the gold-coated microsphere substrate. Various nanopowders are prepared using different gas responsive materials. Uniformly coating one nano powder on a gold-coated microsphere substrate to form a plurality of gas-responsive microspheres. And sequentially implanting the multiple gas response microspheres into the hollow tubular optical fiber to complete the preparation of the gas detection sensor. This application can prepare multiple gas response microballon in an optic fibre to detect multiple gas signal data, simple structure, preparation convenience can be according to the pile size increase and decrease sensing head, possess the practicality.
Description
Technical Field
The application relates to the field of sensor preparation, in particular to a preparation method of a gas detection sensor and a lithium ion battery gas detection system.
Background
Due to the advantages of low cost, high performance, high power, green environment and the like, the lithium ion battery becomes a typical representative of a novel energy source and is widely applied to the fields of 3C digital products, mobile power supplies, electric tools and the like. In these years, due to the aggravation of environmental pollution and the guidance of national policies, the demand of the electric vehicle market mainly for electric vehicles on lithium ion batteries is continuously increased, and in the process of developing high-power lithium ion battery systems, safety issues are paid enough attention and further solutions are urgently needed.
The temperature change of the battery system is determined by two factors, namely heat generation and heat dissipation. The generation of heat in lithium ion batteries can be caused by thermal decomposition and reactions between battery materials; the heat of the battery system is reduced, the high-temperature resistance of the system is improved, and the battery system is safe. Compared with small portable equipment such as a mobile phone, the capacity of a notebook battery is generally smaller than 2Ah, the capacity of a power type lithium ion battery adopted by an electric automobile is generally larger than 10Ah, the local temperature is usually higher than 55 ℃ when the power type lithium ion battery works normally, the internal temperature can reach more than 300 ℃, and under the conditions of high temperature or high-rate charge and discharge, a series of side reactions are caused by the heat release of a high-energy electrode and the temperature rise of a combustible organic solvent, and finally thermal runaway and battery combustion or explosion are caused. Besides thermal runaway caused by chemical reaction factors of the lithium ion battery, safety accidents caused by thermal instability of the lithium ion battery can also be caused by short circuit caused by human factors such as overheating, overcharging and mechanical impact. A large number of researches show that before a lithium ion battery is in a fire, an energy storage system can generate a large number of dangerous gas molecules, and the health state of the lithium ion battery can be predicted by detecting the specific dangerous molecules, so that the fire risk can be predicted, and therefore, the research and development of monitoring sensors capable of detecting the dangerous molecules and the dangerous factors of various lithium ion batteries simultaneously have important practical significance.
Disclosure of Invention
Based on the above, the application provides a preparation method of a gas detection sensor and a lithium ion battery gas detection system, so as to solve the technical problems of battery heating, inflation pressure increase and fire prediction in the lithium battery technology.
A method of making a gas detection sensor, comprising:
depositing gold nanoparticles on the surface of the microsphere to prepare a gold-coated microsphere substrate;
preparing a plurality of nano-powder materials by using different gas response materials;
uniformly coating one nano powder on a gold-coated microsphere substrate to form a plurality of gas response microspheres;
and sequentially implanting the multiple gas response microspheres into the hollow tubular optical fiber to complete the preparation of the gas detection sensor.
In one embodiment, the step of depositing gold nanoparticles on the surface of the microspheres comprises:
and depositing the gold nanoparticles on the surfaces of the microspheres by stirring and cleaning.
In one embodiment, the step of agitating comprises:
and placing the gold nanoparticles and the microspheres in a centrifuge tube, shaking the centrifuge tube for 20 to 30 hours, and centrifuging to obtain the gold-coated microsphere substrate.
In one embodiment, the step of obtaining the gold nanoparticles comprises:
and adding triple distilled water into tetrachloroalloy acid solution, dripping trisodium citrate solution under the conditions of stirring and heating, and cooling to obtain the gold nanoparticles.
In one embodiment, the step of preparing the nano powder using the gas responsive material includes:
doping nano cuprous chloride into the gas response material, dispersing by using an acetic acid solution, and calcining to prepare the nano powder;
by replacing different gas responsive materials, a variety of different nanopowders were prepared.
In one embodiment, the gold-coated microsphere substrate has a diameter of 100 microns to 500 microns.
In one embodiment, the step of uniformly coating the nanopowder on the gold-coated microsphere substrate comprises:
and ball-milling the nano powder for 1 to 5 hours, and preparing the nano powder into slurry by using dimethyl sulfoxide.
A lithium ion battery gas detection system, comprising:
a gas detection sensor manufactured by the method of manufacturing a gas detection sensor according to any one of the above embodiments, the gas detection sensor being fixed on an outer surface of a battery by a winding method or a straight-laid method parallel to a central axis of the battery, or the gas detection sensor being implanted inside the battery, the gas detection sensor being configured to detect gas information of the battery; and
and the data acquisition module is connected with the gas detection sensor and used for analyzing and early warning the gas information and judging the fault position.
In one embodiment, the gas detection sensor is fixed to the outer surface of the battery by means of adhesion or welding.
In one embodiment, the gas detection sensor is one or more of a gas pressure sensor, a gas concentration sensor, or a gas composition sensor.
The preparation method of the gas detection sensor comprises the step of depositing gold nanoparticles on the surfaces of the microspheres to prepare the gold-coated microsphere substrate. Various nanopowders are prepared using different gas responsive materials. Uniformly coating one nano powder on a gold-coated microsphere substrate to form a plurality of gas-responsive microspheres. And sequentially implanting the multiple gas response microspheres into the hollow tubular optical fiber to complete the preparation of the gas detection sensor. This application can prepare multiple gas response microballon in an optic fibre to detect multiple gas signal data, simple structure, preparation convenience can be according to the pile size increase and decrease sensing head, possess the practicality.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for fabricating a gas detection sensor according to one embodiment of the present application;
FIG. 2 is a topographical view of the surface of a microsphere prior to coating with a nanopowder as provided by one embodiment of the present application;
FIG. 3 is a topographical view of the surface of a nanopowder coated microsphere provided by one embodiment of the present application;
FIG. 4 is a block diagram of a gas detection sensor under an electron microscope provided in accordance with one embodiment of the present application;
FIG. 5 is a graph of a gas response of a gas detection sensor provided in accordance with an embodiment of the present application;
fig. 6 is a schematic structural diagram of a gas detection system of a lithium ion battery according to an embodiment of the present disclosure;
FIG. 7 is a hazardous gas pressure detection diagram of a lithium ion battery gas detection system provided in accordance with an embodiment of the present application;
FIG. 8 is a signal detection diagram of different sites in the positioning of a hazardous gas according to one embodiment of the present application;
fig. 9 is a carbon monoxide concentration detection curve provided in an embodiment of the present application.
Description of the main element reference numerals
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, one embodiment of the present application provides a method for manufacturing a gas detection sensor. The preparation method of the gas detection sensor comprises the following steps:
s10, gold nano particles are deposited on the surfaces of the microspheres to prepare the gold-coated microsphere substrate.
In step S10, the material of the microsphere may be polyethylene. The gold nanoparticles are in a colloidal state at room temperature. In one optional embodiment, the step of obtaining the gold nanoparticles may be adding triple distilled water into a tetrachloroalloy acid solution, dropping a trisodium citrate solution while stirring and heating, and cooling to obtain the gold nanoparticles.
Illustratively, the gold nanoparticles were obtained by adding 1 ml of 1% (w/v) solution of HAuCl4 (tetrachloroauric acid) to 40 ml of triple distilled water, boiling with heating while stirring, then adding 1.5 ml of 1% (w/v) solution of trisodium citrate dropwise without stirring, boiling the resulting mixture for another 15 minutes, and then cooling the gold nanocolloid at room temperature. It is understood that the ratio of the tetrachloroalloy acid, the triple distilled water and the trisodium citrate solution can be flexibly adjusted according to the respective concentration values, as long as the gold nano-colloid can be obtained at room temperature.
In one alternative embodiment, the step of depositing gold nanoparticles on the surface of the microsphere may be:
and depositing the gold nanoparticles on the surfaces of the microspheres by stirring and cleaning. Optionally, the stirring step includes placing the gold nanoparticles and the microspheres in a centrifuge tube, shaking the centrifuge tube for 20 to 30 hours, and centrifuging to obtain the gold-coated microsphere substrate.
Illustratively, the specific process of depositing gold nanoparticles on the surface of the microspheres is to put 5ml of gold nanoparticles into a 10ml centrifuge tube, add 0.025g of polystyrene beads (surface grafted-NH 2 ends), shake the tube for about 24 hours, centrifuge to obtain gold-plated polystyrene beads, and then wash the gold-plated polystyrene beads several times with water and ethanol in sequence until there are no gold nanoparticles in the washing solution. And then drying the gold-plated polystyrene beads at room temperature to obtain the gold-coated microsphere substrate.
In one embodiment, the gold-coated microsphere substrate has a diameter of 100 microns to 500 microns. Fig. 2 is a schematic diagram of the surface of the microspheres before being coated with the nanopowder.
And S20, preparing a plurality of nano-powders by using different gas response materials.
In step S20, the gas responsive material includes a porous holding material and a fluorescent material. The porous containment material is for contacting a characteristic gas. The fluorescent material is arranged in the porous containing material and is used for generating action with the characteristic gas.
In one embodiment, the step of preparing the nano powder by using the gas responsive material may be to dope nano cuprous chloride into the gas responsive material, disperse the nano cuprous chloride with an acetic acid solution, and then calcine the nano powder. By replacing different gas responsive materials, a variety of different nanopowders were prepared. Different gas responsive materials may act on different characteristic gases, resulting in a change in the characteristics of the generated fluorescence.
Illustratively, the specific process for preparing the nano powder by using the gas response material comprises the steps of preparing nano powder by using a nano porous ceramic material, doping 1-12% of nano cuprous chloride into the nano powder, dispersing by using 5-9% of acetic acid solution, and calcining to prepare the nano powder.
In one embodiment, the pores of the porous containment material are through-pores and are evenly distributed on the outer wall of the porous containment material. The porous containment material may be a nanoporous ceramic material. The gas responsive material may also be a nanoporous quartz material and a nanoporous glass material, giving the porous containment material insulating properties. The characteristic gas enters through the pores of the porous holding material and reacts with the fluorescent material, so that the generated fluorescent characteristic is changed. After the fluorescence with changed characteristics is collected by the data acquisition module, the condition of damage and the like of the insulating material can be judged by performing parameter analysis on the collected fluorescence.
The fluorescent material is prepared by mixing organic and inorganic fluorescent materials. It is understood that the fluorescent material may use a high molecular polymer fluorescent material. The fluorescent material has characteristic gas sensitivity, so that non-electric quantity detection on characteristic gas can be realized, and the fluorescent material has the characteristic of electromagnetic insensitivity. It is to be understood that the present application is not limited to the fluorescent material, as long as it can be ensured that when the characteristic gas is generated, the fluorescent material is in sufficient contact with the characteristic gas, and the generated characteristic change can be detected. In one embodiment, the fluorescent material is a fluorescent material particle. The diameter of the fluorescent material particles is larger than that of the holes.
S30, uniformly coating one nano powder on a gold-coated microsphere substrate to form a plurality of gas response microspheres.
In step S30, in one embodiment, the step of uniformly coating the nano-powder on the gold-coated microsphere substrate comprises ball milling the nano-powder for 1 to 5 hours, and then slurrying the nano-powder with dimethyl sulfoxide.
Illustratively, the step of uniformly coating the nanopowder on the gold-coated microsphere substrate specifically comprises ball milling the nanopowder for 2 hours. Different gas responsive microspheres can be prepared by coating different nanopowders on each gold-coated microsphere substrate. The structure of the gas responsive microspheres is shown in figure 3.
S40, sequentially implanting the multiple gas response microspheres into the hollow tubular optical fiber to complete the preparation of the gas detection sensor.
In step S40, the optical fiber may be a single-core optical fiber. By adopting the single-core optical fiber, the excitation laser and the generated fluorescence in the visible light wave band can be ensured to be effectively coupled into the optical fiber. The optical fiber can be used for low-loss, high-speed and long-distance transmission, so that high fluorescence efficiency is realized, and a high signal-to-noise ratio is obtained. The optical fiber has the advantages of small volume, light weight, high reliability and the like.
Before the plurality of gas-responsive microspheres are sequentially implanted into the hollow tubular optical fiber, the plurality of gas-responsive microspheres may be immersed in deionized water having a pH of 7.0 to remove loose nanoparticles and dried. And (3) sequentially implanting the multiple gas response microspheres into the hollow tubular optical fiber, and then sealing the hollow tube. It will be appreciated that a number of gas responsive microspheres may be implanted for gas detection calibration purposes. The structure of the prepared gas detection sensor under an electron microscope is shown in fig. 4. Fig. 5 is a gas response curve diagram of the gas detection sensor according to an embodiment of the present application, and it can be seen from fig. 5 that the gas detection sensor has high detection reliability, is insensitive to electromagnetic interference, has strong anti-interference capability, and can implement long-term online monitoring.
In this example, gold nanoparticles were deposited on the surface of the microspheres to prepare gold-coated microsphere substrates. Various nanopowders are prepared using different gas responsive materials. Uniformly coating one nano powder on a gold-coated microsphere substrate to form a plurality of gas-responsive microspheres. And sequentially implanting the multiple gas response microspheres into the hollow tubular optical fiber to complete the preparation of the gas detection sensor. This application can prepare multiple gas response microballon in an optic fibre to detect multiple gas signal data, simple structure, preparation convenience can be according to the pile size increase and decrease sensing head, possess the practicality.
Referring to fig. 6, an embodiment of the present application provides a gas detection system for a lithium ion battery. The lithium ion battery gas detection system includes a gas detection sensor 110 and a data acquisition module 120.
The gas detection sensor 110 is manufactured by the method of manufacturing a gas detection sensor according to any one of the above embodiments, the gas detection sensor 110 is fixed on the outer surface of the battery by a winding method or a straight-lay method parallel to the central axis of the battery, or the gas detection sensor 110 is implanted inside the battery, and the gas detection sensor 110 is used for detecting gas information of the battery.
The data acquisition module 120 is connected to the gas detection sensor 110, and is configured to analyze and pre-warn the gas information, and determine a fault location. In one embodiment, the gas detection sensor 110 is one or more of a gas pressure sensor, a gas concentration sensor, or a gas composition sensor.
It is understood that the gas detection sensor 110 includes a plurality of gas responsive microspheres. Each gas response microsphere is a sensor probe. Each gas-responsive microsphere includes a gold-coated microsphere substrate and a nanopowder coated on the gold-coated microsphere substrate. The gold-coated microsphere substrate can improve the raman scattering signal of the nanopowder, thereby improving the detection stability of the gas detection sensor 110. The nano-powder includes a porous receiving material and a fluorescent material. The porous containment material is for contacting a characteristic gas. The fluorescent material is arranged in the porous containing material and is used for generating action with the characteristic gas.
The working principle of the gas detection sensor 110 is as follows: the excitation laser is transmitted through the optical fiber and then enters the fluorescent material, so that fluorescence is excited. The fluorescence returns to the optical fiber after being reflected and is output by the optical fiber in a conduction way. In one embodiment, the fluorescent material is filled in the porous containing material, and the characteristic gas can enter through the small holes on the side wall of the porous containing material to react with the fluorescent material to change the fluorescent characteristic of the fluorescent material. Thus, sensing of characteristic gas parameters can be achieved by analyzing the fluorescence of the conducted output of the optical fiber.
The gas detection sensor 110 may be used for lithium ion battery signature gas detection in harsh electromagnetic environments. The gas detection sensor 110 can perform multi-factor monitoring on fire hazard key indexes of the electronic energy storage device based on the gas sensitivity characteristic of the fluorescent material so as to improve the predictability and the safety of the energy storage device. In power energy storage lithium ion battery system, the prefabricated cabin type energy storage system is generally adopted, the system is in a closed state for a long time, dangerous gas molecules can be gathered, and the concentration rises rapidly, so that the detection can be realized. All parts of the gas detection sensor 110 are made of high-insulation materials, and a signal carrier of the gas detection sensor 110 is light. Therefore, the gas detection sensor 110 can detect partial discharge of a non-electric quantity, and has high reliability without affecting the object to be measured. The gas detection sensor 110 is insensitive to electromagnetic interference, has strong anti-interference capability and can realize long-term online monitoring. In addition, the gas detection sensor 110 also has the advantages of small volume, high sensitivity, high practicability, convenience in installation and the like. In addition, the gas detection sensor 110 can increase or decrease the sensor probe according to the size of the galvanic pile, has practicability, and can be widely applied to power energy storage and other energy storage devices.
The data acquisition module 120 may include a data acquisition unit and a data analysis unit. As shown in fig. 6. The data acquisition unit may include a filter and a spectrometer. The spectrometer is used for fluorescence detection and acquiring collected data. The data analysis unit carries out visual mapping on the acquired data through processing software, sets an early warning threshold value according to different battery characteristics and monitoring factors, sets a program, and activates sound alarm or displays alarm when the threshold value is exceeded. For monitoring stress generated by thermal runaway inside the energy storage device, the internal pressure increasing sites are monitored, signals are collected in real time, and the signals are analyzed and early warned, so that the fault position is judged.
In one embodiment, the gas detection sensor 110 is fixed to the outer surface of the battery by means of adhesion or welding.
Optionally, the gas detection sensor 110 is arranged in an axial winding manner, that is, the gas detection sensor 110 is uniformly arranged in a spiral shape along the central axis direction of the battery, and two points of the gas detection sensor 110 are fixed to measure the tensile displacement so as to determine the internal pressure of the battery. The test results are shown in fig. 7.
Optionally, the gas detection sensor 110 is implanted in the battery, and the signal reflection of the gas detection sensor 110 is used to measure the stress change inside the battery, and the stress change conduction is proportional to the distance, so that the approximate thermal runaway position can be measured. The test results are shown in fig. 8.
Referring to fig. 9, the gas detection sensor 110 is arranged in an axial winding manner for the battery, and is used for monitoring the carbon monoxide concentration signal, acquiring the signal in real time, analyzing and predicting the signal, and the carbon monoxide concentration detection curve is shown in fig. 9.
In this embodiment, the gas detection sensor 110 can realize non-electrical partial discharge detection, and has no influence on the object to be detected, and has high reliability. The gas detection sensor 110 is insensitive to electromagnetic interference, has strong anti-interference capability and can realize long-term online monitoring. In addition, the gas detection sensor 110 also has the advantages of small volume, high sensitivity, high practicability, convenience in installation and the like. In addition, the gas detection sensor 110 can increase or decrease the sensor probe according to the size of the galvanic pile, has practicability, and can be widely applied to power energy storage and other energy storage devices.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of making a gas detection sensor, comprising:
depositing gold nanoparticles on the surface of the microsphere to prepare a gold-coated microsphere substrate;
preparing a plurality of nano-powder materials by using different gas response materials;
uniformly coating one nano powder on a gold-coated microsphere substrate to form a plurality of gas response microspheres;
and sequentially implanting the multiple gas response microspheres into the hollow tubular optical fiber to complete the preparation of the gas detection sensor.
2. The method for preparing a gas detection sensor according to claim 1, wherein the step of depositing gold nanoparticles on the surface of the microsphere comprises:
and depositing the gold nanoparticles on the surfaces of the microspheres by stirring and cleaning.
3. The method for manufacturing a gas detection sensor according to claim 2, wherein the step of stirring includes:
and placing the gold nanoparticles and the microspheres in a centrifuge tube, shaking the centrifuge tube for 20 to 30 hours, and centrifuging to obtain the gold-coated microsphere substrate.
4. The method for manufacturing a gas detection sensor according to claim 3, wherein the step of obtaining the gold nanoparticles includes:
and adding triple distilled water into tetrachloroalloy acid solution, dripping trisodium citrate solution under the conditions of stirring and heating, and cooling to obtain the gold nanoparticles.
5. The method of manufacturing a gas detection sensor according to claim 1, wherein the step of preparing the nano powder using the gas responsive material includes:
doping nano cuprous chloride into the gas response material, dispersing by using an acetic acid solution, and calcining to prepare the nano powder;
by replacing different gas responsive materials, a variety of different nanopowders were prepared.
6. The method of claim 1, wherein the gold-coated microsphere substrate has a diameter of 100 to 500 microns.
7. The method of claim 1, wherein the step of uniformly coating the nanopowder onto the gold-coated microsphere substrate is preceded by the step of:
and ball-milling the nano powder for 1 to 5 hours, and preparing the nano powder into slurry by using dimethyl sulfoxide.
8. A gas detection system for a lithium ion battery, comprising:
a gas detection sensor (110) prepared by the method of any one of claims 1 to 7, the gas detection sensor (110) being fixed on an outer surface of a battery by a winding method, a straight-lay method parallel to a central axis of the battery, or the gas detection sensor (110) being implanted inside the battery, the gas detection sensor (110) being for detecting gas information of the battery; and
and the data acquisition module (120) is connected with the gas detection sensor (110) and is used for analyzing and early warning the gas information and judging the fault position.
9. The li-ion battery gas detection system of claim 8, wherein the gas detection sensor (110) is affixed to the outer surface of the battery by means of gluing or welding.
10. The lithium ion battery gas detection system of claim 8, wherein the gas detection sensor (110) is one or more of a gas pressure sensor, a gas concentration sensor, or a gas composition sensor.
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