Gas analysis device

Abstract

The present invention relates to a gas analysis device, and an object of the present invention is to provide a gas analysis device capable of analyzing secondary battery generated gas generated in a secondary battery in real time with high resolution. The gas analysis device includes a diffusion chamber unit, a plurality of gas analysis units, an injector unit, and a control unit, wherein the injector unit selectively injects secondary battery generated gas into one of the plurality of gas analysis units.

Description

Technical Field

[0001] This application claims priority based on Korean Patent Application No. 10-2021-0150545, filed on November 4, 2021, the entire disclosure of which is incorporated herein by reference.

[0002] This disclosure relates to a gas analysis device, and specifically to a gas analysis device capable of real-time analysis of secondary battery-generated gases produced in a secondary battery at high resolution. Background Technology

[0003] Typically, a secondary battery is a battery that can be reused through a process of discharging and recharging in the reverse direction, converting chemical energy into electrical energy. Types of secondary batteries include nickel-cadmium (Ni-Cd) batteries, nickel-metal hydride (Ni-MH) batteries, lithium metal batteries, lithium-ion (Li-ion) batteries, and lithium-ion polymer batteries. Among these, lithium-ion secondary batteries, with their high energy density and voltage, long cycle life, and low self-discharge rate, have been commercialized and are widely used.

[0004] Depending on the reaction within the lithium secondary battery, various types of gases can be produced as a secondary battery, such as hydrogen, oxygen, nitrogen, carbon monoxide, carbon dioxide, and C. n H 2n-2 (n=2~5), C n H 2n (n=2~5), C n H 2n+2 (n=1~5) Hydrocarbons and other organic gases.

[0005] Furthermore, lithium secondary batteries degrade due to the generation of large amounts of gas from the electrolyte as it decomposes during repeated charging and discharging processes. This degradation varies depending on the battery's design and usage. Therefore, it is essential to infer the battery degradation mechanism by analyzing the gas generated during the battery development process.

[0006] Therefore, accurate analysis of gases generated by secondary batteries is crucial. Specifically, information on the composition and content of gases generated by secondary batteries is useful in battery material development, battery manufacturing process optimization, and the identification of battery failure causes. For this reason, developing techniques for analyzing gases generated by secondary batteries is important.

[0007] Analysis of the gas generated in the secondary battery can be performed by transferring the gas generated in the secondary battery to a gas detector, such as GC-MS (gas chromatography-mass spectrometry), GC-TCD (gas chromatography-thermal conductivity detector), or GC-FID (gas chromatography-flame ionization detector).

[0008] For example, in the operation of a mass spectrometer (MS) as a detector, GC-MS can use a column including a stationary phase to separate each gas species with a time difference and inject it into the detector, thereby solving the problem that each compound decomposes and the molecular weight and mass value of the compounds do not match, and in the case of some gas species, the characteristic mass values ​​overlap.

[0009] Therefore, when analyzing the gas generated in a secondary battery in real time, the temporal resolution of the measurement data is determined by the time required for gas separation and analysis in the gas detector. Typically, the time required for gas separation and analysis in the gas detector is several minutes to tens of minutes, thus limiting high-resolution analysis. Summary of the Invention

[0010] Technical Purpose

[0011] This disclosure relates to a gas analysis device, and specifically to a gas analysis device capable of real-time analysis of secondary battery-generated gases produced in a secondary battery at high resolution.

[0012] The technical problems to be solved by this disclosure are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art based on the following description.

[0013] Technical solution

[0014] The gas analysis apparatus described in this disclosure may include:

[0015] A diffusion chamber unit is provided with a gas diffusion space, in which a secondary battery is housed;

[0016] Multiple gas analysis units are provided for receiving and analyzing secondary battery generated gas from the gas diffusion space of the diffusion chamber unit.

[0017] A gas discharge pipe is connected to the diffusion chamber unit to discharge the gas generated by the secondary battery in the gas diffusion space;

[0018] Multiple gas injection pipes, each of which is respectively connected to a corresponding gas analysis unit in the multiple gas analysis units;

[0019] An injector unit is configured to selectively connect the gas discharge pipe to one of the plurality of gas injection pipes to inject the gas generated by the secondary battery in the gas diffusion space into one of the plurality of gas analysis units.

[0020] Carrier gas supply unit, the carrier gas supply unit being used to supply carrier gas to the gas diffusion space; and

[0021] A control unit, which is used to control the injector unit.

[0022] Beneficial effects

[0023] The gas analysis apparatus described in this disclosure is capable of high-resolution analysis over time while performing real-time analysis of gases generated by secondary batteries, and can accurately analyze the behavior of secondary batteries as they change under test conditions such as temperature conditions and charging / discharging behavior conditions.

[0024] The gas analysis apparatus described in this disclosure can perform real-time and high-resolution analysis of variable secondary battery driving environments and conditions, and can develop battery materials, optimize battery manufacturing processes, and identify the causes of battery failures by simulating actual secondary battery driving conditions. Attached Figure Description

[0025] Figure 1 This is a conceptual diagram illustrating the gas analysis apparatus described in this disclosure.

[0026] Figure 2 This is a graph showing the time resolution used for analysis in the gas analysis apparatus of this disclosure.

[0027] Figure 3 This is a conceptual diagram illustrating gas flow in a diffusion chamber unit.

[0028] Figure 4 This is a conceptual diagram showing the injector unit.

[0029] Figure 5 This is a block diagram showing the gas analysis unit.

[0030] Figure 6 This is a block diagram illustrating another embodiment of the gas analysis unit. Detailed Implementation

[0031] A gas analysis device disclosed herein may include:

[0032] A diffusion chamber unit is provided with a gas diffusion space, in which a secondary battery is housed;

[0033] Multiple gas analysis units are provided for receiving and analyzing secondary battery generated gas from the gas diffusion space of the diffusion chamber unit.

[0034] A gas discharge pipe is connected to the diffusion chamber unit to discharge the gas generated by the secondary battery in the gas diffusion space;

[0035] Multiple gas injection pipes, each of which is respectively connected to a corresponding gas analysis unit in the multiple gas analysis units;

[0036] An injector unit is configured to selectively connect the gas discharge pipe to one of the plurality of gas injection pipes to inject the gas generated by the secondary battery in the gas diffusion space into one of the plurality of gas analysis units.

[0037] Carrier gas supply unit, the carrier gas supply unit being used to supply carrier gas to the gas diffusion space; and

[0038] A control unit, which is used to control the injector unit.

[0039] In the gas analysis apparatus described in this disclosure, a mass flow controller (MFC) may be disposed in the carrier gas supply flow path connecting the carrier gas supply unit and the diffusion chamber unit.

[0040] In the gas analysis device described in this disclosure, the diffusion chamber unit may include: an inlet through which the carrier gas is injected into the gas diffusion space; and an outlet through which the gas generated by the secondary battery in the gas diffusion space is discharged, wherein, in the inner wall of the diffusion chamber unit forming the gas diffusion space, the outlet of the inlet and the inlet of the outlet may be located on two inner walls facing each other.

[0041] In the gas analysis device described in this disclosure, the diffusion chamber unit may be provided with a carrier gas dispersion space, the carrier gas supply flow path is connected to the carrier gas dispersion space, multiple inlets may be provided, and the inlets of the multiple inlets may be connected to the carrier gas dispersion space.

[0042] In the gas analysis device of this disclosure, the secondary battery can be placed between the exit ports of the plurality of inlets and the inlet of the outlet, and the exit ports of the plurality of inlets can face one side of the secondary battery.

[0043] In the gas analysis apparatus of this disclosure, the injector unit may be a multi-position valve.

[0044] In the gas analysis device of this disclosure, the control unit can receive analysis unit status information from each of the plurality of gas analysis units, and the control unit can control the injector unit based on the analysis unit status information.

[0045] In the gas analysis device of this disclosure, the control unit may include a timer, and the control unit may control the injector unit for a predetermined time period.

[0046] The gas analysis device of this disclosure may further include a plurality of gas sampling units, each of which is disposed in each of the plurality of gas injection pipes to quantify the amount of gas generated by the secondary battery injected into each of the plurality of gas analysis units.

[0047] In the gas analysis device disclosed herein, the diffusion chamber unit may be equipped with a temperature sensor or a pressure sensor, and the control unit may control the injector unit based on the measured value of the temperature sensor or the measured value of the pressure sensor.

[0048] In the gas analysis device of this disclosure, each of the plurality of gas sampling units may be provided with a gas sampling space for quantifying the amount of gas generated by the secondary battery. The volume of the gas sampling space may be formed differently for each of the plurality of gas sampling units, and the control unit may select the gas injection pipe connected to the gas discharge pipe by taking into account the measured value of the temperature sensor, the measured value of the pressure sensor and the volume of the gas sampling space.

[0049] In the gas analysis device of this disclosure, each of the plurality of gas analysis units may be provided with at least two types of columns for decomposing the gas generated by the secondary battery.

[0050] Example

[0051] In the following, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. In this process, the dimensions or shapes of components shown in the drawings may be exaggerated for clarity and convenience. Furthermore, specifically defined terminology may vary depending on the intent or practice of the user and operator, taking into account the construction and operation of this disclosure. The definitions of these terms should be based on the entire contents of this specification.

[0052] In the description of this disclosure, it should be noted that the directions or positional relationships indicated by the terms “center,” “top,” “bottom,” “left,” “right,” “vertical,” “horizontal,” “inner,” “outer,” “one side,” “the other side,” etc., are based on the directions or positional relationships shown in the accompanying drawings or the directions or positional relationships that are typically placed when using the products of this disclosure, and are intended only for the purpose of explaining and briefly describing this disclosure, and are not to be construed as limiting this disclosure, as they do not imply or mean that the illustrated device or element should necessarily be constructed or operated in a particular orientation.

[0053] Figure 1 This is a conceptual diagram illustrating the gas analysis apparatus described in this disclosure. Figure 2 This is a graph showing the time resolution used for analysis in the gas analysis apparatus of this disclosure. Figure 3 This is a conceptual diagram illustrating the gas flow in the diffusion chamber unit 300. Figure 4 This is a conceptual diagram showing the injector unit 600. Figure 5 This is a block diagram showing the gas analysis unit 700. Figure 6 This is a block diagram illustrating another embodiment of the gas analysis unit 700.

[0054] In the following text, see references Figures 1 to 6 The gas analysis apparatus described herein will be described in detail below.

[0055] The gas analysis device described in this disclosure is capable of high-resolution analysis over time when analyzing the gas generated by the secondary battery in real time, and can accurately analyze the behavior of the secondary battery 11 as it changes according to test conditions such as temperature conditions and charging / discharging behavior conditions.

[0056] like Figure 1 As shown, the gas analysis apparatus described in this disclosure may include:

[0057] A diffusion chamber unit 300 is provided with a gas diffusion space 310, in which the secondary battery 11 is housed;

[0058] Multiple gas analysis units 700 are provided for receiving and analyzing secondary battery generated gas produced by the secondary battery 11 from the gas diffusion space 310 of the diffusion chamber unit 300.

[0059] A gas discharge pipe 400 is connected to the diffusion chamber unit 300 to discharge the secondary battery-generated gas in the gas diffusion space 310;

[0060] Multiple gas injection pipes 500, each of the gas injection pipes being respectively disposed in a corresponding gas analysis unit among the multiple gas analysis units 700;

[0061] Injector unit 600, the injector unit is used to selectively connect the gas discharge pipe 400 to one of the plurality of gas injection pipes 500 to inject the secondary battery generated gas in the gas diffusion space 310 into one of the plurality of gas analysis units 700.

[0062] Carrier gas supply unit 100, the carrier gas supply unit being used to supply carrier gas to the gas diffusion space 310; and

[0063] Control unit 800, which is used to control the injector unit 600.

[0064] In order to analyze the secondary battery generated gas produced by the secondary battery 11 in real time, under long-term continuous conditions or environments, the secondary battery generated gas in the diffusion chamber unit 300 is delivered to the gas analysis unit 700 at specific time intervals.

[0065] exist Figure 2 In the diagram, chart A represents the timeline, and chart B shows the gas analysis results output from the plurality of gas analysis units 700. For example... Figure 2 As shown, the time period Ta for high-resolution analysis of the behavior of the secondary battery 11 over time is typically shorter than the time Tb required for a single analysis by a gas analysis unit 700. The gas analysis apparatus described in this disclosure can provide multiple gas analysis units 700 to analyze the continuous condition of the secondary battery 11 over a short time period.

[0066] The carrier gas supply unit 100 can supply carrier gas to deliver the gas generated by the secondary battery in the gas diffusion space 310 of the diffusion chamber unit 300 to the gas analysis unit 700. The carrier gas can be an inert gas, such as helium. The carrier gas supply unit 100 can be a cylinder, bottle, or tank in which the carrier gas is stored.

[0067] The carrier gas supply unit 100 and the diffusion chamber unit 300 can be connected to a carrier gas supply flow path 200. The carrier gas supply flow path 200 can be a pipe or tube through which gas can flow. The carrier gas supplied from the carrier gas supply unit 100 via the carrier gas supply flow path 200 can be supplied to the gas diffusion space 310 of the diffusion chamber unit 300.

[0068] A mass flow controller (MFC) 210 can be installed in the carrier gas supply flow path 200 connecting the carrier gas supply unit 100 and the diffusion chamber unit 300. The gas supplied from the diffusion chamber unit 300 to the gas analysis unit 700 can be a mixture of carrier gas and secondary battery-generated gas. Therefore, it is necessary to know the exact amount of carrier gas injected into the gas diffusion space 310 in order to calculate the amount of secondary battery-generated gas produced by the secondary battery 11 using the analysis results output from the gas analysis unit 700. For this purpose, the carrier gas supply flow path 200 can be equipped with a mass flow controller 210 to weigh or control the amount of carrier gas injected into the gas diffusion space 310.

[0069] like Figure 3 As shown, the diffusion chamber unit 300 may include an inlet 330 and an outlet 340. Carrier gas is injected into the gas diffusion space 310 through the inlet 330, and the gas generated by the secondary battery in the gas diffusion space 310 is discharged through the outlet 340.

[0070] Within the diffusion chamber unit 300, a gas diffusion space 310 may be provided to house the secondary battery 11. In the inner wall of the diffusion chamber unit 300 forming the gas diffusion space 310, the outlet 330's exit 332 and the outlet 340's inlet 341 may be located on two inner walls facing each other. In other words, the outlet 330's exit 332 is formed on one inner wall forming the gas diffusion space 310, and the outlet 340's inlet 341 may be formed on the other inner wall forming the gas diffusion space 310.

[0071] Carrier gas can be introduced into inlet 331 of inlet 330, and the carrier gas can be supplied to gas diffusion space 310 through outlet 332 of inlet 330. The carrier gas and the secondary battery-generated gas in gas diffusion space 310 are discharged to inlet 341 of outlet 340, and outlet 342 of outlet 340 is connected to gas discharge pipe 400, so that the carrier gas and secondary battery-generated gas through outlet 340 can be delivered to gas analysis unit 700.

[0072] The diffusion chamber unit 300 may be provided with a carrier gas dispersion space 320, the carrier gas supply flow path 200 is connected to the carrier gas dispersion space 320, and multiple inlets 330 may be provided, and the inlets 331 of the multiple inlets 330 may be connected to the carrier gas dispersion space 320.

[0073] In other words, within the diffusion chamber unit 300, the gas diffusion space 310 and the carrier gas dispersion space 320 are configured to be separate from each other, and the two spaces can be connected through multiple inlets 330. Specifically, the inlet 331 of the inlet 330 can be located in the carrier gas dispersion space 320, and the outlet 332 of the inlet 330 can be located in the gas diffusion space 310. A carrier gas supply path 200 can be connected to the carrier gas dispersion space 320, such that carrier gas supplied from the carrier gas supply unit 100 can be supplied to the gas diffusion space 310 through the carrier gas dispersion space 320.

[0074] Multiple inlets 330 can be provided, and carrier gas can be injected into the gas diffusion space 310 to be uniformly sprayed onto the front of the secondary battery 11. The gas analysis device of this disclosure operates in real time, and when carrier gas is concentratedly injected into a localized area of ​​the gas diffusion space 310, the carrier gas and the gas generated by the secondary battery are not sufficiently mixed, which may affect the analysis results. To prevent this, multiple inlets 330 can be provided to inject carrier gas into the gas diffusion space 310 at a uniform density.

[0075] Specifically, the secondary battery 11 can be placed between the exit ports 332 of the plurality of inlets 330 and the inlet 341 of the outlet 340, and the exit ports 332 of the plurality of inlets 330 can face one side of the secondary battery 11. Therefore, the carrier gas, such as Figure 3 The flow pattern is shown by the dashed arrow, and the carrier gas can sweep evenly across the secondary battery 11.

[0076] In the gas diffusion space 310 of the diffusion chamber unit 300, a heater (not shown) for heating the secondary battery 11 and a charging and discharging module (not shown) for charging and discharging the secondary battery 11 can be provided.

[0077] The gas discharge pipe 400 and the plurality of gas injection pipes 500 may be pipes or tubes through which gas can flow. The gas discharge pipe 400 and the plurality of gas injection pipes 500 may be connected to the injector unit 600.

[0078] The injector unit 600 can be a multi-position valve.

[0079] like Figure 4As shown, the injector unit 600 includes multiple ports 620 and a switching path 610. Multiple gas injection pipes 500 are respectively connected to the multiple ports, and the switching path 610 is selectively connected to one of the multiple ports 620. One end of the switching flow path 610 can be connected to the gas discharge pipe 400 at the center of a virtual circle. The switching flow path 610 can be a flow path extending in the diametrical direction of the virtual circle and can rotate with the center of the virtual circle as the axis of rotation. Multiple ports 620 connected to the multiple gas injection pipes 500 can be arranged in the arc of the virtual circle. The switching flow path 610 can be selectively connected to one of the multiple ports 620 while rotating, thereby allowing the gas discharge pipe 400 to be selectively connected to one of the multiple gas injection pipes 500.

[0080] The control unit 800 can receive analysis unit status information from each of the plurality of gas analysis units 700, and the control unit 800 can control the injector unit 600 based on the analysis unit status information.

[0081] The analysis unit status information indicates the status of the gas analysis unit 700. For example, the analysis unit status information may indicate whether the gas analysis unit 700 is currently analyzing or in an analysis preparation completion state. The analysis preparation completion state may be a state where analysis can begin immediately when gas generated by the secondary battery is injected. For example, the control unit 800 may control the injector unit 600 such that the gas injection pipe 500 and gas discharge pipe 400 connected to the gas analysis unit 700 are connected in the analysis preparation completion state.

[0082] The control unit 800 may include a timer, and the control unit 800 may control the injector unit 600 at predetermined time intervals. For example, the control unit 800 may control the injector unit 600 at each predetermined time interval, such that the gas injection pipe 500 and the gas discharge pipe 400 connected to the gas analysis unit 700 are connected when the analysis preparation is complete.

[0083] The control unit 800 is a computing device and may be a device that combines hardware and software.

[0084] like Figure 1As shown, the system may further include a plurality of gas sampling units 510, each disposed in each of the plurality of gas injection pipes 500, to quantify the amount of secondary battery-generated gas injected into each of the plurality of gas analysis units 700. The gas sampling unit 510 may be an annular pipe or a tube. The amount of gas generated by the secondary battery can be quantified by the size of the volume of the gas sampling space formed within the gas sampling unit 510.

[0085] The diffusion chamber unit 300 is provided with a temperature sensor 311 and a pressure sensor 312, and the control unit 800 can control the injector unit 600 based on the measured value of the temperature sensor 311 or the measured value of the pressure sensor 312.

[0086] Specifically, each of the plurality of gas sampling units 510 is provided with a gas sampling space for quantifying the amount of gas generated by the secondary battery. The volume of the gas sampling space is formed differently for each of the plurality of gas sampling units 510, and the control unit 800 can select the gas injection pipe 500 connected to the gas discharge pipe 400 by considering the measured values ​​of the temperature sensor 311, the pressure sensor 312, and the volume of the gas sampling space. The amount of gas per unit volume (mass, moles, etc.) can vary depending on temperature and pressure. Therefore, to ensure a specific level of detection sensitivity, it is necessary to adjust the amount of gas sampled in the gas sampling unit 510. Therefore, the control unit 800 can control the injector unit 600 such that the gas sampling unit 510, having a gas sampling space with an appropriate volume according to temperature and pressure, and the gas analysis unit 700 connected to the gas sampling unit 520, are connected to the gas discharge pipe 400 via the gas injection pipe 500.

[0087] like Figure 5 and Figure 6 As shown, the gas analysis unit 700 may include a column 710 for gas chromatography (GC), a mass spectrometer (MS), a thermal conductivity detector (TCD), and a flame ionization detector (FID) as a detector 720 for gas detection. Gases generated by a secondary battery and supplied to the gas analysis unit 700 can be decomposed while passing through the column 710 and then injected into the detector 720.

[0088] Each of the plurality of gas analysis units 700 may have two or more types of columns 710 for decomposing gases generated by secondary batteries. The type of column 710 used for GC can be classified according to the stationary phase filling method, filling material, and specifications. For each type of column 710, depending on the stationary phase filling method, filling material, and specifications, the time required for the separation of individual components included in the secondary battery-generated gases can be varied. Therefore, by using multiple types of columns 710 simultaneously, the gas analysis apparatus of this disclosure can save the time required for GC, and ultimately, by reducing the time required for the separation of individual components in the secondary battery-generated gases. Figure 2 The Tb time indicated in the figure allows for high-resolution gas analysis using a smaller number of gas analysis units 700. In other words, multiple columns 710 can be configured, and each column can have different conditions regarding one or more of the stationary phase packing method, packing material, and specifications. For example, three columns 710 can be configured: one can be packed, another can be micro-packed, and yet another can be capillary. As another example, three columns 710 can be configured: one can be filled with silica or benzene substituted with alkyl groups of various lengths as packing material, another can be filled with polyacrylamide, and yet another can be filled with agarose or dextrin.

[0089] The stationary phase packing method means a method of decomposing the material to be analyzed in the column 710, and may include packing methods, micropacking methods, capillary methods, etc.

[0090] The filling material means the material filled into the column 710, and may include silica or benzene substituted with alkyl groups of various lengths, polyacrylamide, agarose or dextrin.

[0091] The specifications may refer to the size or shape of column 710.

[0092] like Figure 5 As shown, various types of columns 710 can be connected in series, and as... Figure 6 As shown, multiple types of posts 710 can be connected in parallel. For example, the posts 710 can be configured with three types.

[0093] While embodiments according to this disclosure have been described above, these are merely exemplary, and those skilled in the art will understand that various modifications and embodiments based on the equivalent scope are possible. Therefore, the true technical scope of this disclosure should be defined by the following claims.

[0094] <Explanation of Figure Markers>

[0095] 11...Secondary battery 100...Carrier gas supply unit

[0096] 200...Carrier gas supply flow path 210...Mass flow controller

[0097] 300...Diffusion chamber unit 310...Gas diffusion space

[0098] 311...Temperature sensor 312...Pressure sensor

[0099] 320...Carrier gas dispersion space 330...Inlet

[0100] 331...Imported goods entering the country; 332...Imported goods returning to port.

[0101] 340...Exit 341...Entrance to the exit

[0102] 342...export return 400...gas emission pipeline

[0103] 500...Gas injection pipe 510...Gas sampling unit

[0104] 600...Injector unit 610...Switching flow path

[0105] 620...port 700...gas analysis unit

[0106] 710... Column 720... Detector

[0107] 800... control unit

[0108] Industrial application

[0109] The gas analysis apparatus described in this disclosure is capable of high-resolution analysis over time while performing real-time analysis of gases generated by secondary batteries, and can accurately analyze the behavior of secondary batteries as they change according to test conditions such as temperature and charging and discharging behavior.

[0110] The gas analysis apparatus described in this disclosure can perform real-time and high-resolution analysis of variable secondary battery driving environments and conditions, and can develop battery materials, optimize battery manufacturing processes, and identify the causes of battery failures by simulating actual secondary battery driving conditions.

Claims

1. A gas analysis device, comprising: A diffusion chamber unit is provided with a gas diffusion space, in which a secondary battery is housed, and the diffusion chamber unit is provided with a temperature sensor and a pressure sensor. Multiple gas analysis units are provided for receiving and analyzing secondary battery generated gas from the gas diffusion space of the diffusion chamber unit. A gas discharge pipe is connected to the diffusion chamber unit to discharge the gas generated by the secondary battery in the gas diffusion space; Multiple gas injection pipes, each of which is respectively connected to a corresponding gas analysis unit in the multiple gas analysis units; An injector unit is configured to selectively connect the gas discharge pipe to one of the plurality of gas injection pipes to inject the gas generated by the secondary battery in the gas diffusion space into one of the plurality of gas analysis units. A carrier gas supply unit, wherein the carrier gas supply unit is used to supply carrier gas to the gas diffusion space; and A control unit controls the injector unit based on measurements from the temperature sensor or the pressure sensor. The gas analysis device further includes multiple gas sampling units, each of which is disposed in each of the multiple gas injection pipes to quantify the amount of gas generated by the secondary battery injected into each of the multiple gas analysis units. Each gas sampling unit is provided with a gas sampling space for quantifying the amount of gas generated by the secondary battery. For each of the plurality of gas sampling units, the volume of the gas sampling space is formed differently. The control unit selects the gas injection pipe to be connected to the gas discharge pipe by taking into account the measured values ​​of the temperature sensor, the measured values ​​of the pressure sensor, and the volume of the gas sampling space.

2. The gas analysis apparatus according to claim 1, wherein, A mass flow controller (MFC) is provided in the carrier gas supply flow path connecting the carrier gas supply unit and the diffusion chamber unit.

3. The gas analysis apparatus according to claim 2, wherein, The diffusion chamber unit includes: The carrier gas is injected into the gas diffusion space through the inlet; and The gas generated by the secondary battery in the gas diffusion space is discharged from the outlet, and In the diffusion chamber unit, the inlet outlet and the outlet inlet are located on two inner walls facing each other, within the inner wall that forms the gas diffusion space.

4. The gas analysis apparatus according to claim 3, wherein, The diffusion chamber unit is provided with a carrier gas dispersion space, and the carrier gas supply flow path is connected to the carrier gas dispersion space. The imports are configured as multiple, and The inlets of the multiple inlets are connected to the carrier gas dispersion space.

5. The gas analysis apparatus according to claim 4, wherein, The secondary battery is placed between the outlet of the plurality of inlets and the inlet of the outlet, and The exit ports of the plurality of inlets face one side of the secondary battery.

6. The gas analysis apparatus according to claim 1, wherein, The injector unit is a multi-position valve.

7. The gas analysis apparatus according to claim 1, wherein, The control unit receives analysis unit status information from each of the plurality of gas analysis units, and The control unit controls the injector unit based on the status information of the analysis unit.

8. The gas analysis apparatus according to claim 1, wherein, The control unit includes a timer, and The control unit controls the injector unit for a predetermined time period.

9. The gas analysis apparatus according to claim 1, wherein, Each of the plurality of gas analysis units is equipped with at least two types of chromatographic columns for separating the gases generated by the secondary battery.

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