A battery thermal runaway gas detection method, device, equipment, medium and product

Abstract

The present application discloses a battery thermal runaway gas detection method, device, equipment, medium and product, which relates to the field of battery testing technology. The method includes: when the battery is placed in a pressure tank, obtaining the current pressure value of the pressure tank; based on the current pressure value, controlling the first sampling solenoid valve to open, and controlling the first air pump to deliver gas to the first gas tank, the second gas tank or the third gas tank respectively; detecting the gas in the first gas tank, the second gas tank and the third gas tank respectively, and obtaining a first detection result; based on the current pressure value, controlling the second sampling solenoid valve to open, and controlling the second air pump to deliver gas to the continuous gas analysis device, and obtaining a second detection result; based on the first detection result and the second detection result, obtaining the composition and concentration changes of the gas at different stages. The present application can improve the accuracy of battery thermal runaway gas detection.

Description

Technical Field

[0001] The present application relates to the field of battery testing technology, and in particular to a battery thermal runaway gas detection method, device, equipment, medium and product. Background Art

[0002] Thermal runaway refers to an overheating phenomenon in which a chain of exothermic reactions occurs inside the battery, causing the battery temperature to rise sharply, and is mainly manifested as smoking, burning and explosion. In electric vehicles and other application scenarios using large-capacity lithium batteries, the battery will release a certain amount of gas before the battery thermal runaway occurs. If these gases can be identified in a timely and effective manner, the losses can be reduced. Therefore, it is very important to accurately analyze the gases generated during the battery thermal runaway process.

[0003] At present, when studying battery thermal runaway, the battery is usually placed in a sealed pressure vessel for battery thermal runaway testing. After the test, a gas collection bag is used to collect the gas, and finally the gas in the gas collection bag is analyzed for components. However, the above detection method cannot continuously detect the changes in components during the battery gas production process. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the related art, the purpose of the present application is to provide a battery thermal runaway gas detection method, device, equipment, medium and product, which can continuously detect the composition changes during the battery gas production process.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a battery thermal runaway gas detection method, the battery thermal runaway gas detection method comprising: when the battery is placed in a pressure tank, monitoring the pressure in the pressure tank, and obtaining the current pressure value of the pressure tank collected by the pressure sensor; wherein the pressure tank is respectively connected to a first air pump and a second air pump, a first sampling solenoid valve is provided on a connecting pipe between the first air pump and the pressure tank, and the first air pump is respectively connected to a first gas storage tank, a second gas storage tank and a third gas storage tank; a second sampling solenoid valve is provided on a connecting pipe between the second air pump and the pressure tank, the second air pump is connected to a continuous gas analysis device, and the continuous gas analysis device is connected to the pressure tank through a pipeline; The first sampling solenoid valve is controlled to open based on the current pressure value, and the first air pump is controlled to deliver gas to the first gas tank, the second gas tank or the third gas tank respectively; the first gas tank, the second gas tank or the third gas tank is used to store gas at different stages of thermal runaway of the battery; the gas in the first gas tank, the second gas tank and the third gas tank is detected respectively to obtain a first detection result; based on the current pressure value, the second sampling solenoid valve is controlled to open, and the second air pump is controlled to deliver gas to the continuous gas analysis device to obtain a second detection result; based on the first detection result and the second detection result, the composition and concentration changes of the gas at different stages are obtained.

[0007] Optionally, a first solenoid valve is provided on the connecting pipe between the first air pump and the first gas tank, and a second solenoid valve is provided on the connecting pipe between the first air pump and the second gas tank; a third solenoid valve is provided on the connecting pipe between the second air pump and the first gas tank; the controlling the first sampling solenoid valve to open based on the current pressure value, and controlling the first air pump to deliver gas to the first gas tank, the second gas tank or the third gas tank respectively, comprises: when the current pressure value is greater than or equal to a first preset value, controlling the first sampling solenoid valve and the first solenoid valve to open, and controlling the first air pump to deliver gas to the first gas tank; when the current pressure value is greater than or equal to the second preset value, controlling the first sampling solenoid valve and the second solenoid valve to open, and controlling the first air pump to deliver gas to the second gas tank; when the current pressure value is greater than or equal to the third preset value, controlling the first sampling solenoid valve and the third solenoid valve to open, and controlling the first air pump to deliver gas to the third gas tank.

[0008] Optionally, after controlling the first air pump to deliver gas to the first gas storage tank, the method further includes: if the first air pump extracts gas to a preset gas volume value, controlling the first sampling solenoid valve, the first air pump and the first solenoid valve to close; after controlling the first air pump to deliver gas to the second gas storage tank, the method further includes: if the first air pump extracts gas to a preset gas volume value, controlling the first sampling solenoid valve, the first air pump and the second solenoid valve to close; after controlling the first air pump to deliver gas to the third gas storage tank, the method further includes: if the first air pump extracts gas to a preset gas volume value, controlling the first sampling solenoid valve, the first air pump and the third solenoid valve to close.

[0009] Optionally, the first gas tank, the second gas tank and the third gas tank are respectively connected to a gas chromatograph-mass spectrometer; and the gas in the first gas tank, the second gas tank and the third gas tank is respectively detected to obtain a first detection result, including: using the gas chromatograph-mass spectrometer to detect the gas in the first gas tank to obtain a first-stage detection result; using the gas chromatograph-mass spectrometer to detect the gas in the second gas tank to obtain a second-stage detection result; using the gas chromatograph-mass spectrometer to detect the gas in the third gas tank to obtain a third-stage detection result.

[0010] Optionally, the gas composition in the first detection result includes carbon dioxide, carbon monoxide, hydrogen and hydrocarbon categories; the second detection result includes gas composition and gasified electrolyte, and the gas composition includes carbon dioxide, carbon monoxide, hydrogen and hydrocarbon categories.

[0011] Optionally, the method also includes: monitoring the current temperature in the pressure tank to obtain the current temperature of the pressure tank; controlling the first sampling solenoid valve to open based on the current pressure value and the current temperature, and controlling the first air pump to deliver gas to the first gas storage tank, the second gas storage tank or the third gas storage tank respectively; the first gas storage tank, the second gas storage tank or the third gas storage tank is used to store gases at different stages of battery thermal runaway; controlling the second sampling solenoid valve to open based on the current pressure value and the current temperature, and controlling the second air pump to deliver gas to the continuous gas analysis device to obtain a second detection result.

[0012] In a second aspect, the present application provides a battery thermal runaway gas detection device, the battery thermal runaway gas detection device comprising: an acquisition module, used to monitor the pressure in the pressure tank when the battery is placed in the pressure tank, and obtain the current pressure value of the pressure tank collected by the pressure sensor; wherein the pressure tank is respectively connected to a first air pump and a second air pump, a first sampling solenoid valve is provided on the connecting pipe between the first air pump and the pressure tank, and the first air pump is respectively connected to a first gas storage tank, a second gas storage tank and a third gas storage tank; a second sampling solenoid valve is provided on the connecting pipe between the second air pump and the pressure tank, the second air pump is connected to a continuous gas analysis device, and the continuous gas analysis device is connected to the pressure tank through a pipeline a pressure tank connected; a control module, used to control the first sampling solenoid valve to open based on the current pressure value, and control the first air pump to deliver gas to the first gas tank, the second gas tank or the third gas tank respectively; a first detection module, used to detect the gas in the first gas tank, the second gas tank and the third gas tank respectively, to obtain a first detection result; a control detection module, used to control the second sampling solenoid valve to open based on the current pressure value, and control the second air pump to deliver gas to the continuous gas analysis device to obtain a second detection result; a second detection module, used to obtain the composition and concentration changes of the gas at different stages based on the first detection result and the second detection result.

[0013] In a third aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any one of the above-described battery thermal runaway gas detection methods.

[0014] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the above-mentioned battery thermal runaway gas detection methods.

[0015] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of any one of the above-mentioned battery thermal runaway gas detection methods.

[0016] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0017] The present application provides a battery thermal runaway gas detection method, device, equipment, medium and product. On the one hand, the gases at different stages can be stored respectively through the mutually independent first gas storage tank, second gas storage tank and third gas storage tank. By detecting the gases at different stages respectively, the composition and concentration of the gases at different stages can be obtained. The gas released by the battery thermal runaway can be detected in real time by a continuous gas analysis device, and the changes in gas composition during the battery gas production process can be obtained. The gas composition and concentration changes at different stages in the battery gas production process can be obtained through the first detection result and the second detection result. On the other hand, after the detection is completed, the second air pump transports the gas back to the pressure tank. Such a setting can not only detect the gas composition and concentration changes in the pressure tank in real time without affecting the gas volume in the pressure tank; but also can achieve real-time detection of the gas without affecting the gas composition and concentration detection at different stages, thereby effectively ensuring the accuracy of the first detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is an application environment diagram of a battery thermal runaway gas detection method in one embodiment of the present application;

[0020] Figure 2 A schematic diagram of a flow chart of a battery thermal runaway gas detection method provided in one embodiment of the present application;

[0021] Figure 3 A schematic diagram of functional modules of a battery thermal runaway gas detection device provided in one embodiment of the present application;

[0022] Figure 4 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] The battery thermal runaway gas detection method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown, the application environment includes a pressure tank 1, a first gas tank 2, a second gas tank 3, a third gas tank 4, a first air pump and a gas chromatograph-mass spectrometer 5. A first sampling hole is provided on the pressure tank, the first sampling hole is connected to the first gas pump, and a first sampling solenoid valve 6 is provided on the connecting pipe between the first sampling hole and the first gas pump, the first air pump is respectively connected to the first gas tank 2, the second gas tank 3, and the third gas tank 4, and a first solenoid valve 7 is provided on the pipeline connecting the first air pump and the first gas tank 2, a second solenoid valve 8 is provided on the pipeline connecting the first air pump and the second gas tank, and a third solenoid valve 9 is provided on the pipeline connecting the first air pump and the third gas tank; and the first gas tank 2, the second gas tank 3, and the third gas tank 4 are respectively connected to the gas chromatograph-mass spectrometer 5. During the test, a battery is placed in the pressure tank 1 to provide a closed environment for the battery to experience thermal runaway. A pressure sensor is provided in the pressure tank 1 to control the opening / closing of the first sampling solenoid valve 6 and the opening / closing of the first solenoid valve, the second solenoid valve or the third solenoid valve according to the data value collected by the pressure sensor. After the first sampling solenoid valve 6 is opened, the first air pump is started to extract gas from the pressure tank, and the extracted gas is transported to the first gas storage tank 2, the second gas storage tank 3 or the third gas storage tank 4. Then, the gas in the first gas storage tank 2, the second gas storage tank 3 and the third gas storage tank 4 is detected by a gas chromatograph-mass spectrometer 5 to obtain a first detection result.

[0026] In addition, the pressure tank 1 is also provided with a second sampling hole and a return sampling hole, the second sampling hole is connected to a second air pump, and a second sampling solenoid valve 10 is provided on the connecting pipe between the second sampling hole and the second air pump; the second air pump is connected to a continuous gas analysis device 11, and the continuous gas analysis device 11 is connected to the return sampling hole through a pipeline. During the test, while the first sampling solenoid valve 6 is opened and closed, the second sampling solenoid valve 10 is opened and closed, and the second air pump is turned on to guide the gas in the pressure tank 1 to the continuous gas analysis device 11 through the pipeline. The continuous gas analysis device 11 performs real-time detection of the composition and concentration of the gas to obtain a second detection result. After the detection is completed, the gas is reintroduced into the pressure tank 1 through the pipeline.

[0027] On the one hand, the gases at different stages can be stored separately by the mutually independent first gas tank, the second gas tank and the third gas tank, and the composition and concentration of the gases at different stages can be obtained by detecting the gases at different stages respectively; the gases released by thermal runaway of the battery can be detected in real time by the continuous gas analysis device, and the changes in gas composition during the gas production process of the battery can be obtained; the changes in gas composition and concentration at different stages in the gas production process of the battery can be obtained through the first detection result and the second detection result; on the other hand, after the detection is completed, the second air pump transports the gas back to the pressure tank, so as to obtain real-time changes in the composition and concentration of the gas without affecting the volume of the gas in the pressure tank.

[0028] In an exemplary embodiment, Figure 2 As shown, a battery thermal runaway gas detection method is provided, which is executed by a computer device, specifically, it can be executed by a computer device such as a terminal or a server alone, or it can be executed by a terminal and a server together, wherein the terminal can be but not limited to various desktop computers, laptops, smart phones, tablet computers, Internet of Things devices and portable wearable devices, and the Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart car-mounted devices, etc. Portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. The server can be implemented by an independent server or a server cluster composed of multiple servers, and can also be a cloud server.

[0029] In the embodiment of the present application, Figure 1 In the application scenario shown, the battery thermal runaway gas detection method is described, including the following steps S210 to S250. Among them:

[0030] Step S210, when the battery is placed in the pressure tank, the pressure in the pressure tank is monitored to obtain the current pressure value of the pressure tank collected by the pressure sensor.

[0031] In the example embodiment, the pressure tank is respectively connected to the first air pump and the second air pump, a first sampling solenoid valve is arranged on the connecting pipe between the first air pump and the pressure tank, the first air pump is respectively connected to the first gas storage tank, the second gas storage tank and the third gas storage tank; a second sampling solenoid valve is arranged on the connecting pipe between the second air pump and the pressure tank, the second air pump is connected to a continuous gas analysis device, and the continuous gas analysis device is connected to the pressure tank through a pipeline.

[0032] It should be noted that, in the embodiment of the present application, a first air pump is used to create a low-pressure environment on one side of the first gas tank, the second gas tank, and the third gas tank, and the gas in the pressure tank is stored in the first gas tank, the second gas tank, and the third gas tank in stages; a second air pump is used to create a low-pressure environment at the second sampling hole and the return hole of the pressure tank, so that the gas in the pressure tank returns to the pressure tank after passing through the continuous gas analysis device.

[0033] Step S220, based on the current pressure value, controls the first sampling solenoid valve to open, and controls the first air pump to deliver gas to the first gas tank, the second gas tank or the third gas tank respectively; the first gas tank, the second gas tank or the third gas tank is used to store gas at different stages of battery thermal runaway.

[0034] In an example embodiment, the first gas pump is connected to the first gas tank, the second gas tank and the third gas tank, the first gas tank is used to store the gas of the first stage of battery thermal runaway, the second gas tank is used to store the gas of the second stage of battery thermal runaway, and the third gas tank is used to store the gas of the third stage of battery thermal runaway. The first stage is air pressure, the second stage is air pressure, and the third stage is air pressure.

[0035] In a specific embodiment, a first solenoid valve is provided on the connecting pipe between the first air pump and the first gas tank, and a second solenoid valve is provided on the connecting pipe between the first air pump and the second gas tank; a third solenoid valve is provided on the connecting pipe between the second air pump and the first gas tank; the above-mentioned step S220 includes: when the current pressure value is greater than or equal to the first preset value, controlling the first sampling solenoid valve and the first solenoid valve to open, and controlling the first air pump to deliver gas to the first gas tank; when the current pressure value is greater than or equal to the second preset value, controlling the first sampling solenoid valve and the second solenoid valve to open, and controlling the first air pump to deliver gas to the second gas tank; when the current pressure value is greater than or equal to the third preset value, controlling the first sampling solenoid valve and the third solenoid valve to open, and controlling the first air pump to deliver gas to the third gas tank.

[0036] Furthermore, after controlling the first air pump to deliver gas to the first gas storage tank, the method further includes:

[0037] If the gas pumped by the first gas pump reaches a preset gas volume value, the first sampling solenoid valve, the first gas pump and the first solenoid valve are controlled to be closed. And,

[0038] After controlling the first air pump to deliver gas to the second air storage tank, the method further includes:

[0039] If the gas pumped by the first gas pump reaches a preset gas volume value, the first sampling solenoid valve, the first gas pump and the second solenoid valve are controlled to be closed. And,

[0040] After controlling the first air pump to deliver gas to the third air storage tank, the method further includes:

[0041] If the gas extracted by the first gas pump reaches a preset gas volume value, the first sampling solenoid valve, the first gas pump and the third solenoid valve are controlled to be closed.

[0042] As can be understood from the above embodiments, in the initial stage of thermal runaway, as the temperature gradually rises, gas begins to be generated slowly. At this time, the gas concentration is low and the pressure value of the pressure tank is small, but it has begun to accumulate. The first sampling solenoid valve and the first solenoid valve are opened, and the first air pump is controlled to be turned on to store the generated gas in the first gas storage tank. When the gas volume in the first gas storage tank reaches a preset gas volume value (for example, 1L), the gas extraction is stopped and the first sampling solenoid valve and the first solenoid valve are closed. In the middle stage of thermal runaway, the gas generation rate increases sharply, causing the internal pressure of the battery to rise rapidly; at this time, the concentration of CO, CO2 and other organic gases increases significantly, and the pressure value of the pressure tank rises, for example, by 0.5Kpa. The first sampling solenoid valve and the second solenoid valve are opened, and the first air pump is controlled to store the generated gas in the second gas storage tank. When the gas volume in the second gas storage tank reaches a preset gas volume value (for example, 1L), the gas extraction is stopped and the first sampling solenoid valve and the second solenoid valve are closed. During the rapid heat release stage, the internal pressure of the pressure tank is too high and the battery shell may rupture, causing oxygen to enter and mix with the combustible gas inside the battery, thereby causing combustion. At this stage, the electrolyte is almost completely consumed, and the first sampling solenoid valve and the third solenoid valve are opened, and the first air pump is controlled to store the generated gas in the third gas storage tank. When the gas volume in the second gas storage tank reaches a preset gas volume value (for example, 1L), the gas extraction is stopped and the first sampling solenoid valve and the third solenoid valve are closed.

[0043] It should be noted that in the example of the present application, the first gas storage tank, the second gas storage tank and the third gas storage tank can be independently provided, or a gas storage tank can be provided, and the gas storage tank has three mutually unconnected cavities, namely, cavity 1#, cavity 2# and cavity 3#. The pressure tank introduces gas into cavity 1#, cavity 2# and cavity 3# respectively through the opening and closing of the first solenoid valve, the second solenoid valve and the third solenoid valve.

[0044] And, in the embodiment of the present application, the first preset value is the reference pressure value at the initial stage of thermal runaway, and the reference pressure value is set according to the volume of the pressure tank and the temperature and pressure value of the gas generated at the initial stage of thermal runaway, which is subject to the actual application and is not specifically limited in the embodiment of the present application. The second preset threshold is 0.5Kpa added to the quasi-base pressure value, and the third preset value is 0.5Kpa added to the second preset threshold. The increase in the above pressure values ​​can also be adjusted according to the actual application, and the embodiment of the present application is only for example.

[0045] Step S230, detecting the gases in the first gas storage tank, the second gas storage tank, and the third gas storage tank respectively to obtain a first detection result.

[0046] In a specific embodiment, the first gas storage tank, the second gas storage tank and the third gas storage tank are respectively connected to a gas chromatograph-mass spectrometer. The above step S230 includes: using the gas chromatograph-mass spectrometer to detect the gas in the first gas storage tank to obtain the first stage detection result; using the gas chromatograph-mass spectrometer to detect the gas in the second gas storage tank to obtain the second stage detection result; using the gas chromatograph-mass spectrometer to detect the gas in the third gas storage tank to obtain the third stage detection result.

[0047] It can be understood that the gas compositions in the first stage test results, the second stage test results and the third stage test results all include carbon dioxide, carbon monoxide, hydrogen and hydrocarbons; wherein, the gas composition and concentration in the first gas storage tank are detected by gas chromatography-mass spectrometry to obtain the gas composition and concentration generated in the initial stage of thermal runaway; the gas composition and concentration in the second gas storage tank are detected by gas chromatography-mass spectrometry to obtain the gas composition and concentration generated in the middle stage of thermal runaway; the gas composition and concentration in the third gas storage tank are detected by gas chromatography-mass spectrometry to obtain the gas composition and concentration generated in the rapid heat release stage.

[0048] Step S240, based on the current pressure value, the second sampling solenoid valve is controlled to open, and the second air pump is controlled to deliver gas to the continuous gas analysis device to obtain a second detection result.

[0049] In an exemplary embodiment, the first detection result includes carbon dioxide, carbon monoxide, hydrogen, and hydrocarbons. The second detection result includes gas composition and gasified electrolyte, the gas composition including carbon dioxide, carbon monoxide, hydrogen, and hydrocarbons.

[0050] The principle of the continuous gas analysis device is based on the near-infrared spectrum selective absorption characteristics of different gas molecules, and uses the relationship between gas concentration and absorption intensity (Lambert-Beer Law) to identify gas components and determine their concentrations. It is an optical sensor mainly composed of infrared light source, optical path, infrared detector, circuit and software algorithm. For example, paramagnetic sensor or electrochemical oxygen sensor is used to detect the concentration of carbon dioxide and carbon monoxide; thermal conductivity difference or electrochemical method is used to detect the concentration of hydrogen; flame ionization detector (FID) is used to detect the concentration of hydrocarbons in the gas.

[0051] Paramagnetic sensors are used to detect the concentration of carbon dioxide and carbon monoxide in the gas. Specifically, the paramagnetic sensor is composed of a pair of symmetrical dumbbell balls suspended in a non-uniform magnetic field. When the surrounding gas contains oxygen, the oxygen strongly acted upon by the magnetic field will push the dumbbell balls to deflect. That is, when oxygen molecules are exposed to an external magnetic field, they will exhibit strong paramagnetism, which means that they will be attracted to the magnetic field and will also generate a small additional magnetic field. The direction of this additional magnetic field is the same as that of the external magnetic field, and the paramagnetism of oxygen is significantly greater than that of conventional gases. Therefore, the characteristic that oxygen molecules are attracted to strong magnetic fields can be used to detect the amount of oxygen.

[0052] The electrochemical oxygen sensor is composed of a highly active oxygen electrode and a metal electrode immersed in an acidic colloidal electrolyte. The oxygen molecules in the gas diffuse into the oxygen electrode through the polymer film for electrochemical reaction, and the current generated is proportional to the number of oxygen molecules diffused to the oxygen electrode. In other words, the higher the concentration of oxygen molecules in the gas, the more oxygen molecules participate in the reaction per unit time, and the greater the current generated.

[0053] Hydrogen is detected by using thermal conductivity differences or electrochemical methods. For example, the concentration of H2 can be analyzed by measuring the change in thermal conductivity of the mixed gas. Specifically, the difference in thermal conductivity is usually converted into a change in resistance through a circuit, and the change in thermal conductivity of the mixed gas is converted into a change in the resistance of the thermistor that can be easily and accurately measured. That is, the change in thermal conductivity of the mixed gas can be obtained by measuring the resistance of the thermistor, and thus the concentration of the measured hydrogen gas can be analyzed.

[0054] The flame ionization detector (FID) uses the flame generated by the combustion of hydrogen and air as energy. When organic compounds enter the flame burning with hydrogen and oxygen, chemical ionization occurs at high temperature. Ionization produces ions that are several orders of magnitude higher than the base current. Under the directional action of the high-voltage electric field, an ion flow is formed. The weak ion flow is amplified by high resistance and becomes an electrical signal that is proportional to the amount of organic compounds entering the flame. Therefore, CH organic matter can be quantitatively analyzed according to the size of the signal.

[0055] It should be noted that the continuous gas analysis device is kept open when the battery is tested; the gas in the pressure tank is extracted by a second air pump and then passed into the continuous gas analysis device, and the gas enters the pressure tank again after passing through the continuous gas analysis device. This arrangement can not only perform real-time detection of the gas composition and concentration changes in the pressure tank without affecting the volume of the gas in the pressure tank; but also can achieve real-time detection of the gas without affecting the gas composition and concentration detection at different stages, thereby effectively ensuring the accuracy of the first detection result.

[0056] Step S250, based on the first detection result and the second detection result, obtain the composition and concentration changes of the gas at different stages.

[0057] In an example embodiment, based on the first detection result and the second detection result, the gas types are identified as to which gases are specifically produced, such as CO, CO2, H2, CH4, etc.; the specific concentration of each gas is measured; and the changing trend of the concentration of each gas over time is recorded, thereby depicting the trajectory of the development of thermal runaway.

[0058] In other embodiments, the current temperature in the pressure tank is monitored to obtain the current temperature of the pressure tank; based on the current pressure value and the current temperature, the first sampling solenoid valve is controlled to open, and the first air pump is controlled to deliver gas to the first gas tank, the second gas tank or the third gas tank respectively; the first gas tank, the second gas tank or the third gas tank is used to store gases at different stages of thermal runaway of the battery; based on the current pressure value and the current temperature, the second sampling solenoid valve is controlled to open, and the second air pump is controlled to deliver gas to the continuous gas analysis device to obtain a second detection result.

[0059] By implementing the above-mentioned steps S210 to S250, on the one hand, the gases at different stages can be stored respectively through the mutually independent first gas storage tank, the second gas storage tank, and the third gas storage tank, and by detecting the gases at different stages respectively, the composition and concentration of the gases at different stages can be obtained; the gases released by thermal runaway of the battery can be detected in real time by a continuous gas analysis device, and the changes in gas composition during the gas production process of the battery can be obtained; the changes in gas composition and concentration at different stages in the gas production process of the battery can be obtained through the first detection result and the second detection result; on the other hand, after the detection is completed, the second air pump transports the gas back to the pressure tank. Such a setting can not only perform real-time detection of the gas composition and concentration changes in the pressure tank without affecting the gas volume in the pressure tank; but also can achieve real-time detection of the gas without affecting the gas composition and concentration detection at different stages, thereby effectively ensuring the accuracy of the first detection result.

[0060] Based on the same inventive concept, the embodiment of the present application also provides a battery thermal runaway gas detection device for implementing the battery thermal runaway gas detection method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more battery thermal runaway gas detection device embodiments provided below can refer to the limitations of the battery thermal runaway gas detection method above, and will not be repeated here.

[0061] In an exemplary embodiment, Figure 3As shown, a battery thermal runaway gas detection device is provided, and the battery thermal runaway gas detection device 300 includes: an acquisition module 310, a control module 320, a first detection module 330, a control detection module 340, and a second detection module 350;

[0062] The acquisition module 310 is used to monitor the pressure in the pressure tank when the battery is placed in the pressure tank, and obtain the current pressure value of the pressure tank collected by the pressure sensor; wherein the pressure tank is connected to the first air pump and the second air pump respectively, and a first sampling solenoid valve is provided on the connecting pipe between the first air pump and the pressure tank, and the first air pump is connected to the first gas storage tank, the second gas storage tank and the third gas storage tank respectively; a second sampling solenoid valve is provided on the connecting pipe between the second air pump and the pressure tank, and the second air pump is connected to the continuous gas analysis device, and the continuous gas analysis device is connected to the pressure tank through a pipeline;

[0063] The control module 320 is used to control the first sampling solenoid valve to open based on the current pressure value, and control the first air pump to deliver gas to the first gas storage tank, the second gas storage tank or the third gas storage tank respectively;

[0064] The first detection module 330 is used to detect the gas in the first gas storage tank, the second gas storage tank, and the third gas storage tank respectively to obtain a first detection result;

[0065] The control detection module 340 is used to control the second sampling solenoid valve to open based on the current pressure value, and control the second air pump to deliver gas to the continuous gas analysis device to obtain a second detection result;

[0066] The second detection module 350 is used to obtain the composition and concentration changes of the gas at different stages based on the first detection result and the second detection result.

[0067] As an optional embodiment, a first solenoid valve is provided on the connecting pipe between the first air pump and the first gas tank, and a second solenoid valve is provided on the connecting pipe between the first air pump and the second gas tank; a third solenoid valve is provided on the connecting pipe between the second air pump and the first gas tank; the above-mentioned control module 320 is also specifically used to, when the current pressure value is greater than or equal to the first preset value, control the first sampling solenoid valve and the first solenoid valve to open, and control the first air pump to deliver gas to the first gas tank; when the current pressure value is greater than or equal to the second preset value, control the first sampling solenoid valve and the second solenoid valve to open, and control the first air pump to deliver gas to the second gas tank; when the current pressure value is greater than or equal to the third preset value, control the first sampling solenoid valve and the third solenoid valve to open, and control the first air pump to deliver gas to the third gas tank.

[0068] As an optional embodiment, the above-mentioned control module 320 is also specifically used to control the first sampling solenoid valve, the first air pump and the first solenoid valve to be closed if the gas extracted by the first air pump reaches a preset gas volume value; if the gas extracted by the first air pump reaches a preset gas volume value, the first sampling solenoid valve, the first air pump and the second solenoid valve are controlled to be closed; if the gas extracted by the first air pump reaches a preset gas volume value, the first sampling solenoid valve, the first air pump and the third solenoid valve are controlled to be closed.

[0069] As an optional implementation, the first gas tank, the second gas tank and the third gas tank are respectively connected to a gas chromatograph-mass spectrometer; the first detection module 330 is specifically used to detect the gas in the first gas tank using the gas chromatograph-mass spectrometer to obtain the first stage detection result; to detect the gas in the second gas tank using the gas chromatograph-mass spectrometer to obtain the second stage detection result; to detect the gas in the third gas tank using the gas chromatograph-mass spectrometer to obtain the third stage detection result.

[0070] As an optional embodiment, the composition of the gas in the above-mentioned first detection result includes carbon dioxide, carbon monoxide, hydrogen and hydrocarbon categories; the second detection result includes the gas composition and the gasified electrolyte, and the gas composition includes carbon dioxide, carbon monoxide, hydrogen and hydrocarbon categories.

[0071] As an optional implementation, the battery thermal runaway gas detection device 300 is also specifically used to monitor the current temperature in the pressure tank to obtain the current temperature of the pressure tank; control the first sampling solenoid valve to open based on the current pressure value and the current temperature, and control the first air pump to deliver gas to the first gas tank, the second gas tank or the third gas tank respectively; the first gas tank, the second gas tank or the third gas tank is used to store gases at different stages of battery thermal runaway; control the second sampling solenoid valve to open based on the current pressure value and the current temperature, and control the second air pump to deliver gas to the continuous gas analysis device to obtain a second detection result.

[0072] Among them, by implementing this embodiment, on the one hand, the gases at different stages can be stored respectively through the mutually independent first gas tank, the second gas tank, and the third gas tank, and by detecting the gases at different stages respectively, the composition and concentration of the gases at different stages can be obtained; the gas released by the thermal runaway of the battery can be detected in real time by the continuous gas analysis device, and the changes in gas composition during the gas production process of the battery can be obtained; the changes in gas composition and concentration at different stages in the gas production process of the battery can be obtained through the first detection result and the second detection result; on the other hand, after the detection is completed, the second air pump transports the gas back to the pressure tank. Such a setting can not only perform real-time detection of the gas composition and concentration changes in the pressure tank without affecting the gas volume in the pressure tank; but also can achieve real-time detection of the gas without affecting the gas composition and concentration detection at different stages, and can effectively ensure the accuracy of the first detection result.

[0073] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store battery thermal runaway gas detection data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a battery thermal runaway gas detection method is implemented.

[0074] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0075] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0076] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0077] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0078] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0079] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0080] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0081] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A battery thermal runaway gas detection method, characterized in that: The battery thermal runaway gas detection method comprises: When the battery is placed in the pressure tank, the pressure in the pressure tank is monitored to obtain the current pressure value of the pressure tank collected by the pressure sensor; wherein the pressure tank is respectively connected to a first air pump and a second air pump, a first sampling solenoid valve is provided on a connecting pipe between the first air pump and the pressure tank, and the first air pump is respectively connected to a first gas storage tank, a second gas storage tank and a third gas storage tank; a second sampling solenoid valve is provided on a connecting pipe between the second air pump and the pressure tank, the second air pump is connected to a continuous gas analysis device, and the continuous gas analysis device is connected to the pressure tank through a pipeline; Based on the current pressure value, the first sampling solenoid valve is controlled to open, and the first air pump is controlled to deliver gas to the first gas storage tank, the second gas storage tank or the third gas storage tank respectively; the first gas storage tank, the second gas storage tank or the third gas storage tank is used to store gas at different stages of thermal runaway of the battery; Respectively testing the gas in the first gas storage tank, the second gas storage tank, and the third gas storage tank to obtain a first testing result; Based on the current pressure value, the second sampling solenoid valve is controlled to open, and the second air pump is controlled to deliver gas to the continuous gas analysis device to obtain a second detection result; Based on the first detection result and the second detection result, the composition and concentration changes of the gas at different stages are obtained.

2. The battery thermal runaway gas detection method according to claim 1, characterized in that: A first solenoid valve is provided on the connecting pipe between the first air pump and the first air tank, a second solenoid valve is provided on the connecting pipe between the first air pump and the second air tank; a third solenoid valve is provided on the connecting pipe between the second air pump and the first air tank; The controlling the first sampling solenoid valve to open based on the current pressure value, and controlling the first air pump to deliver gas to the first air storage tank, the second air storage tank or the third air storage tank respectively, comprises: When the current pressure value is greater than or equal to a first preset value, the first sampling solenoid valve and the first solenoid valve are controlled to open, and the first air pump is controlled to deliver gas to the first air storage tank; When the current pressure value is greater than or equal to a second preset value, the first sampling solenoid valve and the second solenoid valve are controlled to open, and the first air pump is controlled to deliver gas to the second air storage tank; When the current pressure value is greater than or equal to a third preset value, the first sampling solenoid valve and the third solenoid valve are controlled to open, and the first air pump is controlled to deliver gas to the third air storage tank.

3. The battery thermal runaway gas detection method according to claim 2, characterized in that: After controlling the first air pump to deliver gas to the first air storage tank, the method further includes: If the gas pumped by the first gas pump reaches a preset gas volume value, the first sampling solenoid valve, the first gas pump and the first solenoid valve are controlled to be closed; After controlling the first air pump to deliver gas to the second air storage tank, the method further includes: If the gas extracted by the first gas pump reaches the preset gas volume value, the first sampling solenoid valve, the first gas pump and the second solenoid valve are controlled to be closed; After controlling the first air pump to deliver gas to the third gas storage tank, the method further includes: If the gas extracted by the first gas pump reaches the preset gas volume value, the first sampling solenoid valve, the first gas pump and the third solenoid valve are controlled to be closed.

4. The battery thermal runaway gas detection method according to claim 1, characterized in that: The first gas storage tank, the second gas storage tank and the third gas storage tank are respectively connected to a gas chromatograph-mass spectrometer; The method of respectively detecting the gas in the first gas storage tank, the second gas storage tank, and the third gas storage tank to obtain a first detection result includes: Using the gas chromatography-mass spectrometry instrument to detect the gas in the first gas storage tank to obtain a first-stage detection result; Using the gas chromatography-mass spectrometry instrument to detect the gas in the second gas storage tank to obtain a second-stage detection result; The gas in the third gas storage tank is detected by using the gas chromatography-mass spectrometry to obtain the third stage detection result.

5. The battery thermal runaway gas detection method according to any one of claims 1 to 4, characterized in that: The composition of the gas in the first detection result includes carbon dioxide, carbon monoxide, hydrogen and hydrocarbon categories; the second detection result includes gas composition and gasified electrolyte, and the gas composition includes carbon dioxide, carbon monoxide, hydrogen and hydrocarbon categories.

6. The battery thermal runaway gas detection method according to claim 1, characterized in that: The method further comprises: Monitoring the current temperature in the pressure tank to obtain the current temperature of the pressure tank; Based on the current pressure value and the current temperature, the first sampling solenoid valve is controlled to open, and the first air pump is controlled to deliver gas to the first gas storage tank, the second gas storage tank or the third gas storage tank respectively; the first gas storage tank, the second gas storage tank or the third gas storage tank is used to store gas at different stages of thermal runaway of the battery; Based on the current pressure value and the current temperature, the second sampling solenoid valve is controlled to open, and the second air pump is controlled to deliver gas to the continuous gas analysis device to obtain a second detection result.

7. A battery thermal runaway gas detection device, characterized in that: The battery thermal runaway gas detection device comprises: An acquisition module is used to monitor the pressure in the pressure tank when the battery is placed in the pressure tank, and acquire the current pressure value of the pressure tank collected by the pressure sensor; wherein the pressure tank is respectively connected to a first air pump and a second air pump, a first sampling solenoid valve is provided on the connecting pipe between the first air pump and the pressure tank, and the first air pump is respectively connected to a first gas storage tank, a second gas storage tank and a third gas storage tank; a second sampling solenoid valve is provided on the connecting pipe between the second air pump and the pressure tank, the second air pump is connected to a continuous gas analysis device, and the continuous gas analysis device is connected to the pressure tank through a pipeline; a control module, configured to control the first sampling solenoid valve to open based on the current pressure value, and control the first air pump to deliver gas to the first gas storage tank, the second gas storage tank or the third gas storage tank respectively; A first detection module, used to detect the gas in the first gas storage tank, the second gas storage tank, and the third gas storage tank respectively to obtain a first detection result; a control detection module, configured to control the second sampling solenoid valve to open based on the current pressure value, and control the second gas pump to deliver gas to the continuous gas analysis device to obtain a second detection result; The second detection module is used to obtain the composition and concentration changes of the gas at different stages based on the first detection result and the second detection result.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the battery thermal runaway gas detection method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the battery thermal runaway gas detection method described in any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the battery thermal runaway gas detection method described in any one of claims 1 to 6 are implemented.

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