Gas Analyzers

Abstract

The present invention relates to a gas analyzer, and provides a gas analyzer capable of analyzing a gas generated from a secondary battery in real time with high resolution.

Description

[Technical field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0150545 filed on November 4, 2021, and all contents disclosed in the documents of the Korean Patent Application are incorporated herein by reference.

[0002] The present invention relates to a gas analyzer, and more particularly to a gas analyzer capable of analyzing gas generated from a secondary battery in real time with high resolution. [Background technology]

[0003] In general, secondary batteries are batteries that can be used repeatedly through a discharging process that converts chemical energy into electrical energy and a charging process in the opposite direction, and there are various types of secondary batteries, such as 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 secondary batteries, lithium secondary batteries, which have high energy density and voltage, long cycle life, and low self-discharge rate, have been commercialized and are widely used.

[0004] The reaction inside the lithium secondary battery produces 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 Various types of gases, such as hydrocarbons (n=1 to 5) and other organic gases, are generated as secondary cell generated gases.

[0005] In addition, lithium secondary batteries degrade as a large amount of secondary battery gas is generated due to electrolyte decomposition as a result of repeated charging and discharging, and this behavior varies depending on the design and usage of the battery. Therefore, it is essential in the battery development process to analyze the secondary battery gas and infer the degradation mechanism of the battery.

[0006] Therefore, it is very important to accurately analyze the gas evolved from secondary batteries. Specifically, information on the composition and content of the gas evolved from secondary batteries is useful for developing battery materials, optimizing the battery manufacturing process, and identifying the cause of battery defects. For this reason, it is important to develop technology to analyze the gas evolved from secondary batteries.

[0007] The analysis of the gas generated from the secondary battery is carried out by transmitting 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 GC-MS, in order to solve the problem that the molecular weight and mass value of a compound do not match when each compound is decomposed by using a mass spectrometer (MS) as a detector, and that characteristic mass values ​​overlap in the case of some gas species, a column containing a stationary phase is used to separate each gas species at a time lag and inject it into the detector.

[0009] Therefore, when analyzing the gas generated in the secondary battery in real time, the time resolution of the measurement data is determined by the time required for gas separation and analysis in the gas detector. Generally, the time required for gas separation and analysis in the gas detector is several minutes to several tens of minutes, which limits the high-resolution analysis. Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention relates to a gas analyzer, and has an object to provide a gas analyzer capable of analyzing a gas generated from a secondary battery in real time with high resolution.

[0011] The technical problems that the present invention aims to solve are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0012] The gas analysis device of the present invention includes a diffusion chamber unit having a gas diffusion space in which a secondary battery is housed; a plurality of gas analysis units that analyze the secondary battery generated gas transmitted from the secondary battery from the gas diffusion space of the diffusion chamber unit; a gas exhaust pipe connected to the diffusion chamber unit and exhausting the secondary battery generated gas in the gas diffusion space; a plurality of gas injection pipes respectively provided in the plurality of gas analysis units; an injector unit that selectively connects the gas exhaust pipe to one of the plurality of gas injection pipes and injects the secondary battery generated gas in the gas diffusion space into one of the plurality of gas analysis units; a carrier gas supply unit that supplies a carrier gas to the gas diffusion space; and a control unit that controls the injector unit. Effect of the Invention

[0013] The gas analyzer of the present invention is capable of high-resolution analysis with respect to time when analyzing gas generated by a secondary battery in real time, and is capable of precisely analyzing the behavior of the secondary battery due to changes in experimental conditions such as temperature and charge / discharge behavior.

[0014] The gas analyzer of the present invention is capable of real-time, high-resolution analysis of the variable operating environment and conditions of a secondary battery, and can replicate the operating conditions of an actual secondary battery to develop battery materials, optimize the battery manufacturing process, and identify the causes of battery defects. [Brief description of the drawings]

[0015] [Figure 1] 1 is a conceptual diagram showing a gas analyzer of the present invention. [Diagram 2] 4 is a graph illustrating the time resolution of analysis by the gas analyzer of the present invention. [Diagram 3] FIG. 2 is a conceptual diagram showing the gas flow in the diffusion chamber unit. [Figure 4] FIG. 2 is a conceptual diagram showing an injector unit. [Diagram 5] FIG. 2 is a block diagram showing a gas analysis unit. [Figure 6] FIG. 13 is a block diagram showing another embodiment of the gas analysis unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The gas analysis device of the present invention includes a diffusion chamber unit having a gas diffusion space in which a secondary battery is housed; a plurality of gas analysis units that analyze the secondary battery generated gas transmitted from the secondary battery from the gas diffusion space of the diffusion chamber unit; a gas exhaust pipe connected to the diffusion chamber unit and exhausting the secondary battery generated gas in the gas diffusion space; a plurality of gas injection pipes respectively provided in the plurality of gas analysis units; an injector unit that selectively connects the gas exhaust pipe to one of the plurality of gas injection pipes and injects the secondary battery generated gas in the gas diffusion space into one of the plurality of gas analysis units; a carrier gas supply unit that supplies a carrier gas to the gas diffusion space; and a control unit that controls the injector unit.

[0017] A mass flow controller (MFC) is provided in a carrier gas supply flow path connecting the carrier gas supply unit and the diffusion chamber unit of the gas analyzer of the present invention.

[0018] The diffusion chamber unit of the gas analysis device of the present invention includes an inlet through which the carrier gas is injected into the gas diffusion space and an outlet through which the secondary battery generated gas is discharged from the gas diffusion space, and the outlet of the inlet and the inlet of the outlet are located on each of two inner walls of the diffusion chamber unit that face each other and form the gas diffusion space.

[0019] The diffusion chamber unit of the gas analysis device of the present invention is provided with a carrier gas dispersion space to which the carrier gas supply flow path is connected, and the injection ports are provided in multiple numbers, with the inlets of the multiple injection ports being connected to the carrier gas dispersion space.

[0020] In the gas analyzer of the present invention, the secondary battery is disposed between the outlets of the multiple inlets and the inlet of the exhaust port, and the outlets of the multiple inlets face one side of the secondary battery.

[0021] In the gas analyzer of the present invention, the injector unit is also a multi-position valve.

[0022] The control unit of the gas analyzer of the present invention 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 analysis unit status information.

[0023] The control unit of the gas analyzer of the present invention includes a timer, and the control unit controls the injector unit at regular time intervals.

[0024] The gas analysis device of the present invention further includes a plurality of gas sampling units provided in the plurality of gas injection pipes, respectively, for quantifying the amount of the secondary-cell generated gas injected into each of the plurality of gas analysis units.

[0025] The diffusion chamber unit of the gas analyzer of the present invention is provided with a temperature sensor or a pressure sensor, and the control unit controls the injector unit based on the measurement value of the temperature sensor or the measurement value of the pressure sensor.

[0026] Each of the plurality of gas sampling units of the gas analyzer of the present invention 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, and the control unit selects a gas injection pipe to be connected to the gas exhaust pipe in consideration of the measurement value of the temperature sensor, the measurement value of the pressure sensor, and the volume of the gas sampling space.

[0027] In the gas analyzer of the present invention, each of the plurality of gas analysis units is provided with two or more types of columns for decomposing the gas generated by the secondary battery.

[0028] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this process, the size and shape of components shown in the drawings may be exaggerated for clarity and convenience of explanation. Furthermore, terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or practice of a user or operator. The definition of such terms should be based on the overall content of this specification.

[0029] In describing the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "one side," "other side," and the like are based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships typically arranged when the product of the present invention is used, and are merely for the purpose of describing and briefly explaining the present invention, and do not present or imply that the displayed devices or elements must necessarily have a specific orientation, be configured or operated in a specific orientation, and should not be understood as limiting the present invention.

[0030] FIG. 1 is a conceptual diagram showing a gas analyzer of the present invention. FIG. 2 is a graph illustrating the time resolution of analysis by the gas analyzer of the present invention. FIG. 3 is a conceptual diagram showing the flow of gas in a diffusion chamber unit 300. FIG. 4 is a conceptual diagram showing an injector unit 600. FIG. 5 is a block diagram showing a gas analysis unit 700. FIG. 6 is a block diagram showing another embodiment of the gas analysis unit 700.

[0031] The gas analyzer of the present invention will be described in detail below with reference to FIGS.

[0032] The gas analyzer of the present invention is capable of high-resolution analysis with respect to time when analyzing gas generated by a secondary battery in real time, and is capable of precisely analyzing the behavior of the secondary battery 11 due to changes in experimental conditions such as temperature and charge / discharge behavior.

[0033] As shown in FIG. 1, the gas analyzer of the present invention includes a diffusion chamber unit 300 having a gas diffusion space 310 in which a secondary battery 11 is housed; a plurality of gas analysis units 700 for analyzing the secondary battery generated gas transmitted from the gas diffusion space 310 of the diffusion chamber unit 300; a gas exhaust pipe 400 connected to the diffusion chamber unit 300 and discharging the secondary battery generated gas in the gas diffusion space 310; a plurality of gas injection pipes 500 respectively provided in the plurality of gas analysis units 700; an injector unit 600 for selectively connecting the gas exhaust pipe 400 to one of the plurality of gas injection pipes 500 and injecting the secondary battery generated gas in the gas diffusion space 310 into one of the plurality of gas analysis units 700; a carrier gas supply unit 100 for supplying a carrier gas to the gas diffusion space 310; and a control unit 800 for controlling the injector unit 600.

[0034] Analyzing the secondary battery generated gas in the secondary battery 11 in real time involves transmitting the secondary battery generated gas in the diffusion chamber unit 300 to the gas analysis unit 700 for analysis at specific time periods under continuous conditions or environments over a long period of time.

[0035] In Fig. 2, graph A indicates the time axis, and graph B indicates the gas analysis results output from a plurality of gas analysis units 700. As shown in Fig. 2, the time period Ta for high-resolution analysis of the behavior of secondary battery 11 over time is generally shorter than the time Tb required for one analysis by one gas analysis unit 700. The gas analysis device of the present invention is provided with a plurality of gas analysis units 700, and is capable of analyzing the continuous status of secondary battery 11 in a short time period.

[0036] The carrier gas supply unit 100 is for supplying a carrier gas to the diffusion chamber unit 300 for carrying the secondary battery generated gas located in the gas diffusion space 310 of the diffusion chamber unit 300 to the gas analysis unit 700. The carrier gas is an inert gas such as helium. The carrier gas supply unit 100 is a cylinder, a gas tank, or the like in which the carrier gas is stored.

[0037] The carrier gas supply unit 100 and the diffusion chamber unit 300 are connected to a carrier gas supply passage 200. The carrier gas supply passage 200 is a pipe or a tube through which a gas flows. The carrier gas supplied from the carrier gas supply unit 100 through the carrier gas supply passage 200 may be supplied to a gas diffusion space 310 of the diffusion chamber unit 300.

[0038] A mass flow controller (MFC) 210 is provided in the carrier gas supply passage 200 connecting the carrier gas supply unit 100 and the diffusion chamber unit 300. The type of gas transferred from the diffusion chamber unit 300 to the gas analysis unit 700 is a mixture of the carrier gas and the secondary battery generated gas. Therefore, only when the exact amount of the carrier gas injected into the gas diffusion space 310 is known, the amount of the secondary battery generated gas actually generated in the secondary battery 11 can be calculated through the analysis result output from the gas analysis unit 700. For this purpose, the carrier gas supply passage 200 may be provided with a mass flow controller 210 for metering or controlling the amount of the carrier gas injected into the gas diffusion space 310.

[0039] As shown in FIG. 3, the diffusion chamber unit 300 includes an inlet 330 through which the carrier gas is injected into the gas diffusion space 310, and an outlet 340 through which the secondary battery generated gas is discharged from the gas diffusion space 310.

[0040] A gas diffusion space 310 in which a secondary battery 11 is accommodated is provided inside the diffusion chamber unit 300, and the outlet 332 of the inlet 330 and the inlet 341 of the outlet 340 are located on two opposing inner walls of the diffusion chamber unit 300 that form the gas diffusion space 310. That is, the outlet 332 of the inlet 330 may be formed on one inner wall that forms the gas diffusion space 310, and the inlet 341 of the outlet 340 may be formed on the other inner wall that forms the gas diffusion space 310.

[0041] A carrier gas is inputted to an inlet 331 of the inlet 330, and the carrier gas may be supplied to the gas diffusion space 310 through an outlet 332 of the inlet 330. The carrier gas and secondary battery generated gas in the gas diffusion space 310 are discharged through an inlet 341 of the outlet 340, and an outlet 342 of the outlet 340 is connected to a gas exhaust pipe 400, so that the carrier gas and secondary battery generated gas passing through the outlet 340 may be delivered to a gas analysis unit 700.

[0042] The diffusion chamber unit 300 is provided with a carrier gas dispersion space 320 to which the carrier gas supply passage 200 is connected, and the injection ports 330 are provided in plurality, and the inlets 331 of the injection ports 330 are connected to the carrier gas dispersion space 320.

[0043] That is, a gas diffusion space 310 and a carrier gas dispersion space 320, which are separate spaces, are provided inside the diffusion chamber unit 300, and the two spaces are connected through a plurality of inlets 330. Specifically, an inlet 331 of the inlet 330 may be located in the carrier gas dispersion space 320, and an outlet 332 of the inlet 330 may be located in the gas diffusion space 310. The carrier gas supply passage 200 is connected to the carrier gas dispersion space 320, and the carrier gas supplied from the carrier gas supply unit 100 may be supplied to the gas diffusion space 310 via the carrier gas dispersion space 320.

[0044] A plurality of injection ports 330 are provided, and the carrier gas is injected into the gas diffusion space 310 so as to be uniformly sprayed over the entire surface of the secondary battery 11. The gas analysis device of the present invention is performed in real time, and if the carrier gas is injected intensively into a local area in the gas diffusion space 310, the carrier gas and the gas generated by the secondary battery may not be mixed sufficiently, which may affect the analysis results. To prevent this, a plurality of injection ports 330 may be provided to inject the carrier gas into the gas diffusion space 310 at a uniform density.

[0045] Specifically, the secondary battery 11 is disposed between the outlet 332 of the plurality of inlets 330 and the inlet 341 of the outlet 340, and the outlet 332 of the plurality of inlets 330 faces one side of the secondary battery 11. Therefore, the carrier gas flows as indicated by the dotted arrow in FIG. 3, and the carrier gas can uniformly cover the secondary battery 11.

[0046] In the gas diffusion space 310 of the diffusion chamber unit 300, a heater (not shown) for heating the secondary battery 11, a charge / discharge module (not shown) for charging / discharging the secondary battery 11, and the like may be provided.

[0047] The gas exhaust pipe 400 and the gas injection pipes 500 are pipes or tubes through which gas flows. The gas exhaust pipe 400 and the gas injection pipes 500 are connected to an injector unit 600.

[0048] The injector unit 600 is also a multi-way valve.

[0049] 4, the injector unit 600 may include a plurality of ports 620 to which the plurality of gas injection pipes 500 are respectively connected, and a switching channel 610 selectively connected to one of the plurality of ports 620. The switching channel 610 has one end connected to the gas exhaust pipe 400 at the center of an imaginary circle. The switching channel 610 is a channel that extends in the diameter direction of the imaginary circle and is rotatable around the center of the imaginary circle as a rotation axis. A plurality of ports 620 to which the plurality of gas injection pipes 500 are respectively connected are arranged on an arc of the imaginary circle. The switching channel 610 is selectively connected to one of the plurality of ports 620 while rotating, and thus the gas exhaust pipe 400 is selectively connected to one of the plurality of gas injection pipes 500.

[0050] The control unit 800 receives analysis unit status information from each of the plurality of gas analysis units 700, and controls the injector unit 600 based on the analysis unit status information.

[0051] The analysis unit status information is information indicating the status of the gas analysis unit 700, for example, information indicating whether the gas analysis unit 700 is performing analysis or is in a state where analysis is ready. The analysis is ready in a state where analysis can be started immediately if the secondary battery generated gas is injected. For example, the control unit 800 can control the injector unit 600 so that the gas injection pipe 500 connected to the gas analysis unit 700 in the analysis is ready and the gas exhaust pipe 400 are connected to each other.

[0052] The control unit 800 includes a timer, and controls the injector unit 600 at a certain time period. For example, the control unit 800 may control the injector unit 600 so that the gas inlet pipe 500 connected to the gas analysis unit 700, which is in a ready-for-analysis state, and the gas outlet pipe 400 are connected to each other at a preset time period.

[0053] The control unit 800 is a computing device, and is a device in which hardware and software are combined.

[0054] 1, the gas sampling unit 510 is provided in each of the gas injection pipes 500 and measures the amount of the secondary battery generated gas injected into each of the gas analysis units 700. The gas sampling unit 510 is a looped pipe or tube. The amount of the secondary battery generated gas is measured according to the volume of a gas sampling space formed inside the gas sampling unit 510.

[0055] The diffusion chamber unit 300 is provided with a temperature sensor 311 and a pressure sensor 312 , and the control unit 800 controls the injector unit 600 based on the measurement value of the temperature sensor 311 or the measurement value of the pressure sensor 312 .

[0056] Specifically, each of the gas sampling units 510 is provided with a gas sampling space for quantifying the amount of gas generated from the secondary battery, and the volume of the gas sampling space is formed differently for each of the gas sampling units 510. The control unit 800 selects the gas injection pipe 500 to be connected to the gas exhaust pipe 400 in consideration of the measurement value of the temperature sensor 311, the measurement value of the pressure sensor 312, and the volume of the gas sampling space. The amount of gas per unit volume (mass, moles, etc.) may vary depending on the temperature and pressure. Therefore, in order to ensure a certain level of detection sensitivity, it is necessary to adjust the amount of gas sampled from the gas sampling unit 510. Therefore, the control unit 800 can control the injector unit 600 so that the gas injection pipe 500 and the gas exhaust pipe 400 of the gas analysis unit 700 connected to the gas sampling unit 510 having a gas sampling space of an appropriate volume depending on the temperature and pressure are connected to each other.

[0057] 5 and 6, the gas analysis unit 700 may include a column 710 for gas chromatography (GC) and a detector 720 for gas detection, such as a mass spectrometry (MS), a thermal conductivity detector (TCD), or a flame ionization detector (FID). The secondary battery generated gas delivered to the gas analysis unit 700 is decomposed while passing through the column 710 and then injected into the detector 720.

[0058] Each of the gas analysis units 700 is provided with two or more types of columns 710 for decomposing the secondary battery generated gas. The types of columns 710 for GC are classified according to the stationary phase packing method, packing material, and specifications. The time required to separate the individual components contained in the secondary battery generated gas may differ depending on the type of column 710, which varies depending on the stationary phase packing method, packing material, and specifications. Therefore, by simultaneously using multiple types of columns 710, the gas analyzer of the present invention can save the time required for GC, and ultimately reduce the time corresponding to Tb shown in FIG. 2, and high-resolution gas analysis is possible even with a smaller number of gas analysis units 700. That is, a plurality of columns 710 are provided, and each column may differ in one or more conditions of the stationary phase packing method, packing material, and specifications. For example, three columns 710 may be provided, and one column 710 may be provided in a packed type, another column 710 in a micro-packed type, and the remaining one in a capillary type. As yet another example, three columns 710 are provided, one column 710 is filled with silica substituted with alkyl groups of various lengths or benzene as a packing material, another column 710 is filled with polyacrylamide as a packing material, and the remaining one is filled with agarose or dextrin as a packing material.

[0059] The stationary phase packing method means a method for decomposing the analyte in the column 710, and includes a packed method, a micro-packed method, a capillary method, and the like.

[0060] The packing material refers to a material packed in the column 710, and may be silica, polyacrylamide, agarose, dextrin, or the like, substituted with alkyl groups of various lengths or benzene.

[0061] The specification refers to the size or shape of the column 710 .

[0062] The various columns 710 may be connected in series as shown in Figure 5, or in parallel as shown in Figure 6. For example, three types of columns 710 may be provided.

[0063] Although the embodiment of the present invention has been described above, it is merely an example, and a person skilled in the art will understand that various modifications and equivalent embodiments are possible. Therefore, the true technical scope of the present invention should be determined by the claims. [Industrial Applicability]

[0064] The gas analyzer of the present invention is capable of high-resolution analysis with respect to time when analyzing gas generated by a secondary battery in real time, and is capable of precisely analyzing the behavior of the secondary battery due to changes in experimental conditions such as temperature and charge / discharge behavior.

[0065] The gas analyzer of the present invention is capable of real-time, high-resolution analysis of the variable operating environment and conditions of a secondary battery, and can replicate the operating conditions of an actual secondary battery to develop battery materials, optimize the battery manufacturing process, and identify the causes of battery defects. [Explanation of symbols]

[0066] 11: Secondary battery 100: Transport gas supply unit 200: Carrier gas supply passage 210: Mass flow controller 300: Diffusion chamber unit 310: Gas diffusion space 311: Temperature sensor 312: Pressure sensor 320: Gas transport space 330: Inlet 331: Inlet of injection port 332: Inlet outlet 340: Outlet 341: Exhaust port entrance 342: Exhaust outlet 400: Gas exhaust pipe 500: Gas injection pipe 510: Gas sampling unit 600: Injector unit 610: Switching channel 620:Port 700: Gas analysis unit 710: Column 720: Detector 800: Control unit

Claims

1. a diffusion chamber unit having a gas diffusion space in which a secondary battery is housed; a plurality of gas analysis units for analyzing the secondary battery generated gas transferred from the gas diffusion space of the diffusion chamber unit; a gas exhaust pipe connected to the diffusion chamber unit and configured to exhaust the secondary battery generated gas from the gas diffusion space; a plurality of gas injection pipes provided in the plurality of gas analysis units, respectively; an injector unit selectively connecting the gas exhaust pipe to one of the plurality of gas injection pipes to inject the secondary battery generated gas in the gas diffusion space into one of the plurality of gas analysis units; a carrier gas supply unit for supplying a carrier gas to the gas diffusion space; a control unit for controlling the injector unit; a plurality of gas sampling units provided in the plurality of gas injection pipes, respectively, for quantifying the amount of the secondary battery generated gas injected into each of the plurality of gas analysis units; Including, Each of the plurality of gas sampling units is provided with a gas sampling space for quantitatively determining an amount of the gas generated by the secondary battery; A gas analyzer, wherein the volume of the gas sampling space is formed differently for each of the plurality of gas sampling units.

2. 2. The gas analyzer of claim 1, wherein a mass flow controller (MFC) is provided in a carrier gas supply passage connecting the carrier gas supply unit and the diffusion chamber unit.

3. The diffusion chamber unit comprises: an inlet through which the carrier gas is injected into the gas diffusion space; an exhaust port through which the secondary battery generated gas in the gas diffusion space is exhausted; 3. The gas analyzer according to claim 2, wherein the outlet of the inlet and the inlet of the exhaust port are located on two inner walls of the diffusion chamber unit that face each other and define the gas diffusion space.

4. The diffusion chamber unit includes a carrier gas diffusion space to which the carrier gas supply passage is connected. The injection port is provided in plurality, 4. The gas analyzer of claim 3, wherein the inlets of a plurality of said inlets are connected to said transport gas dispersion space.

5. the secondary battery is disposed between the outlets of the plurality of inlets and the inlets of the exhaust port; The gas analyzer according to claim 4 , wherein outlets of the plurality of inlets face one side surface of the secondary battery.

6. 2. The gas analyzer of claim 1, wherein the injector unit is a multi-way valve.

7. the control unit receives analysis unit status information from each of the plurality of gas analysis units; The gas analyzer of claim 1 , wherein the control unit controls the injector unit based on the analytical unit status information.

8. the control unit includes a timer; The gas analyzer according to claim 1 , wherein the control unit controls the injector unit at regular time intervals.

9. The diffusion chamber unit is provided with a temperature sensor or a pressure sensor, 9. The gas analyzer according to claim 1, wherein the control unit controls the injector unit based on a measurement value of the temperature sensor or a measurement value of the pressure sensor.

10. The gas analyzer of claim 9, wherein the control unit selects a gas injection pipe to be connected to the gas exhaust pipe taking into account the measurement value of the temperature sensor, the measurement value of the pressure sensor, and the volume of the gas sampling space.

11. The gas analyzer according to claim 1 , wherein each of the plurality of gas analysis units is provided with two or more types of columns for decomposing the gas generated by the secondary battery.

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