Gas collection device and gas analyzer using the same

Abstract

The present invention relates to a gas collection device, and provides a gas collection device for real-time collection of gases generated inside a cylindrical secondary battery, and a gas analyzer using the same.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application Nos. 10-2023-0158770 and 10-2023-0158776 filed on November 16, 2023, and all contents disclosed in the Korean patent applications are included as part of this specification.

[0002] The present invention relates to a gas collection device, and more particularly, to a gas collection device capable of collecting gases generated inside a secondary battery in real time and a gas analysis device using the same.

Background Art

[0003] A secondary battery is a battery that can be repeatedly used through a discharge process of converting chemical energy into electrical energy and a charging process of converting electrical energy into chemical energy. As its types, nickel-cadmium (Ni-Cd) batteries, nickel-metal hydride (Ni-MH) batteries, lithium metal batteries, lithium-ion (Li-ion) batteries, and lithium-ion polymer batteries are generally known. Among these secondary batteries, lithium secondary batteries having high energy density, voltage, long cycle life, and low self-discharge rate have been commercialized and widely used.

[0004] Inside a lithium secondary battery, various gases such as hydrogen, oxygen, nitrogen, carbon monoxide, carbon dioxide, hydrocarbons represented by C n H 2n-2 (n = 2 to 5), C n H 2n (n = 2 to 5), C n H 2n+2 (n = 1 to 5), and other organic gas species are generated.

[0005] Furthermore, lithium-ion secondary batteries generate a large amount of gas during the decomposition and degradation of the electrolyte due to repeated charging and discharging cycles. This process manifests itself in various ways depending on the battery's design and usage. Therefore, analyzing the gases generated inside the battery and inferring the battery's degradation mechanism is an essential step in the battery development process.

[0006] Therefore, it is extremely important to collect and accurately analyze the gases generated within secondary batteries. Information on the composition and content of various gases generated during the charging and discharging of lithium secondary batteries is useful in the development of battery materials, optimization of battery manufacturing processes, and identification of the causes of battery failures. For this purpose, the development of technologies for collecting gases generated inside secondary batteries is crucial.

[0007] One method for analyzing the gases generated inside a secondary battery involves the following process.

[0008] To collect the target gas generated from inside the secondary battery, perforations are made in the battery case. The secondary battery with the perforations is placed in a sealed gas diffusion space. After waiting for a certain period of time, the target gas is diffused into the gas diffusion space. The target gas diffused into the gas diffusion space is sampled into a separate sampling container or transmitted to a gas analyzer (e.g., GC-MS) for gas analysis.

[0009] In the aforementioned process, the method of placing the entire secondary battery in the "gas diffusion space" makes it difficult to apply separate analytical conditions (temperature, shock, vibration, etc.) to the secondary battery during the analysis process, and requires a volume of the gas diffusion space that is significantly larger than the secondary battery, resulting in the analyte gas being diluted more than necessary.

[0010] To improve this, one method involves attaching a gas collection device to the surface of the secondary battery case where perforations have been made to collect the target gas. However, even with this method, bending and other deformations occur in the secondary battery case during the perforation process, making it difficult to expect perfect airtightness and limiting the scope of long-term analysis.

[0011] Therefore, a gas collection or analysis device that addresses the aforementioned problems is needed. [Overview of the project] [Problems that the invention aims to solve]

[0012] The objective of the present invention is to provide a gas collection device for real-time collection of gases generated inside a secondary battery.

[0013] Another object of the present invention is to provide a gas analyzer for real-time analysis of gases generated inside a secondary battery while applying various conditions to the secondary battery. The technical problems that the present invention aims to solve are not limited to the technical problems described above, 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]

[0014] The gas collection device of the present invention is for collecting gas from a battery and includes a lower jig portion having a battery through-hole formed at both ends open; a closed-loop sealing portion located above the lower jig portion; and an upper jig portion having a battery insertion groove and a gas diffusion space, and being connected to the lower jig portion with the sealing portion in between.

[0015] In one example, a cylindrical battery is inserted into the battery through-hole of the lower jig portion by sliding, and the battery is able to rotate freely within the lower jig portion.

[0016] In one embodiment, the lower jig portion is cylindrical in shape and extends vertically, the battery through-hole penetrates the lower jig portion vertically, and the vertical length of the lower jig portion is shorter than the vertical length of the battery to be analyzed.

[0017] According to one embodiment, the battery insertion groove is formed on the surface of the upper jig portion that is in contact with the sealing portion, and the battery insertion groove is cylindrical in shape extending in the vertical direction and includes a first section having a first inner diameter and a second section having a second inner diameter, the first inner diameter and the second inner diameter are each larger than the outer diameter of the battery, and the first inner diameter is larger than the second inner diameter.

[0018] In one embodiment, the sealing portion is ring-shaped with a predetermined thickness, the size of the first inner diameter is greater than the sum of the outer diameter of the battery to be analyzed and the thickness of the sealing portion, the length of the second inner diameter is less than the sum of the outer diameter of the battery to be analyzed and the thickness of the sealing portion, and the sealing portion is in close contact with the step formed at the boundary between the first section and the second section.

[0019] In one embodiment, screw threads are formed on the inner circumferential surface of the first section of the battery insertion groove and on the outer circumferential surface of the lower jig portion, and the lower jig portion is screwed into the battery insertion groove.

[0020] According to one example, the gas diffusion space is formed in the upper part of the second section of the battery insertion groove.

[0021] In one example, the gas diffusion space is disk-shaped, and the diameter of the gas diffusion space is smaller than the diameter of the battery being analyzed.

[0022] According to an embodiment, the upper jig part further includes an arc-shaped auxiliary diffusion space having a predetermined width and separated from the gas diffusion space, centered on the center of the gas diffusion space. The gas diffusion space and the auxiliary diffusion space communicate with each other through a plurality of carrier gas injection holes, and include a gas transmission flow path connected to the gas diffusion space and a carrier gas supply flow path connected to the auxiliary diffusion space.

[0023] According to an embodiment, the central angle of the arc formed by the auxiliary diffusion space is 90° to 270°.

[0024] The gas analyzer according to the present invention includes: a gas collection device as described above; a carrier gas supply unit that supplies a carrier gas to the gas diffusion space of the gas collection device through a carrier gas supply flow path; a mass flow control unit that controls the flow rate of the carrier gas; and a gas analysis unit that analyzes the gas transmitted from the gas diffusion space through the gas transmission flow path.

[0025] According to an embodiment, when a battery is inserted into the battery through hole of the lower jig part, it may further include a conditioning unit coupled to the lower end of the exposed battery.

[0026] According to an embodiment, the conditioning unit includes a charging / discharging unit that charges or discharges the battery.

[0027] According to an embodiment, the conditioning unit further includes one or more selected from a vibration unit, a striking unit, a heater unit, a cooling unit, a pressurizing unit, and a negative pressure unit.

[0028] According to an embodiment, the gas transmission flow path is provided with a manifold unit, the gas analysis unit is connected to the manifold unit, and may further include a vacuum pump unit connected to the manifold unit and a pressure measurement unit connected to the manifold unit.

Effects of the Invention

[0029] The gas collection device of the present invention can collect gases generated inside a secondary battery in real time.

[0030] The gas collection device of the present invention eliminates the problem of leakage due to bending of the perforated surface by forming a seal on the side surface of the secondary battery that is not the perforated surface.

[0031] The gas collection device of the present invention can efficiently transfer the target gas by arranging the transported gas to flow radially from the perforated hole of the secondary battery.

[0032] The gas analyzer of the present invention can analyze the gas generated inside a cylindrical secondary battery in real time while applying various conditions to the secondary battery. [Brief explanation of the drawing]

[0033] [Figure 1] This is a perspective view showing a gas collection device as an example. [Figure 2] This is a cross-sectional view along line A-A' in Figure 1. [Figure 3] This diagram shows the upper jig section based on an actual example. [Figure 4] This is a cross-sectional view along line B-B' in Figure 1. [Figure 5] This figure shows a gas analyzer based on one example. [Figure 6] This is a block diagram illustrating a gas analyzer in a schematic manner, based on another concrete example. [Modes for carrying out the invention]

[0034] The embodiments of the present invention will be described in detail below with reference to the attached drawings. In the process, the size and shape of the 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 change depending on the intent or convention of the user or operator. The definitions of such terms should be based on the overall content of this specification.

[0035] In describing the present invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," "outside," "one side," and "other side" are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships in which the product of the present invention is typically arranged during use. They are merely for the purpose of describing and briefly explaining the present invention, and do not imply or suggest that the displayed device or element must necessarily be configured or operated in a specific direction, and should not be understood as limiting the present invention.

[0036] Figure 1 is a perspective view showing a gas collection device 10 according to one embodiment. Figure 2 is a cross-sectional view taken along line A-A' in Figure 1. Figure 3 is a conceptual diagram showing the upper jig section 100. Figure 4 is a cross-sectional view taken along line B-B' in Figure 1. Figure 5 shows a gas analyzer according to one embodiment. Figure 6 is a block diagram showing a gas analyzer according to another embodiment.

[0037] The gas collection device 10 and gas analyzer 20 of the present invention will be described in detail below with reference to Figures 1 to 6.

[0038] The gas collection device 10 of the present invention collects gases generated inside a secondary battery. Specifically, using a secondary battery as the battery to be analyzed 11, the device collects gases generated inside the secondary battery (negative electrode, positive electrode, electrolyte, etc.) in real time while applying physical conditions such as temperature changes, including charging and discharging, to the secondary battery.

[0039] In the gas collection device 10 of the present invention, the battery 11 to be analyzed is a cylindrical secondary battery. A cylindrical secondary battery consists of stacked negative electrodes, positive electrodes, and a separation membrane arranged in a jelly roll and housed in a cylindrical case made of a rigid material. The positive electrode tab and negative electrode tab, which electrically connect the positive electrode and negative electrode to the outside, can both be located at one end of the secondary battery. That is, one end of the secondary battery is the electrode side where the positive electrode tab and negative electrode tab are located, and the other end of the secondary battery is the non-electrode side where there are no positive electrode tab and negative electrode tab.

[0040] For gas collection, a hole may be formed by drilling a hole in the non-polar side using a pointed tool. In this process, the surface of the non-polar side may form an irregular curved surface as it is crushed while the hole is being formed. Therefore, if a seal is formed directly on the non-polar side, there is a risk of leakage due to the irregular curved surface.

[0041] The gas collection device 10 of the present invention collects gas by covering the non-electrode side, but by forming a seal on the side of the battery, the seal can be stably formed and maintained for a long time. Furthermore, since the gas collection device 10 of the present invention can collect gas with a part of the battery 11 to be analyzed, including the electrode side, open to the outside, various conditions such as heating, cooling, shock, and vibration, including charging and discharging, can be applied to the battery 11 to be analyzed during gas collection.

[0042] In Figures 1 to 5, the z-axis direction is the vertical direction. In the cylindrical coordinate system shown in Figure 1, the r-direction is the first direction. In Figures 1 to 5, the x-axis direction is perpendicular to the vertical direction. In Figures 1 to 5, the y-axis direction is perpendicular to both the vertical and x-axis directions.

[0043] The battery 11 to be analyzed can be coupled to the gas collection device 10 with the electrode side facing downwards, the non-electrode side facing upwards, and its longitudinal direction parallel to the vertical direction.

[0044] As shown in Figures 1 and 2, the gas collection device 10 of the present invention includes: a lower jig portion 200 surrounding the side surface of the battery 11 to be analyzed; a closed-loop sealing portion 300 located above the lower jig portion into which the battery 11 is inserted; an upper jig portion 100 covering the upper end of the battery 11 and connected to the lower jig portion 200 with the sealing portion 300 in between; a transport gas supply channel 410 for supplying transport gas to a gas diffusion space 120 provided inside the upper jig portion 100; and a gas transfer channel 510 for transferring the gas from the gas diffusion space 120 to a gas collection container or gas analyzer.

[0045] The gas diffusion space 120 consists of gas diffusion grooves on the surface of the upper jig portion 100 facing the battery 11.

[0046] A battery through-hole 210 is formed in the lower jig portion 200, and the battery 11 to be analyzed is inserted into the battery through-hole 210. The outer surface of the battery 11 slides against the inner surface of the battery through-hole 210, allowing the battery 11 to rotate freely relative to the lower jig portion 200.

[0047] The lower jig portion 200 is cylindrical in shape and extends vertically, and the battery through-hole 210 may be formed to penetrate the lower jig portion 200 vertically, leaving both ends of the lower jig portion 200 open. The vertical length of the lower jig portion 200 is shorter than the vertical length of the battery 11. More specifically, the vertical length of the lower jig portion 200 is even shorter than the vertical length of the battery 11 minus the depth of the battery insertion groove 110. Therefore, the electrode side of the battery 11 to be analyzed is completely exposed to the outside, and various conditions can be applied to the battery 11 to be analyzed while gas is being collected.

[0048] Steps are formed along the circumferential direction on the outer surface of the lower jig portion 200, and the upper outer diameter of the lower jig portion 200 may be smaller than the lower outer diameter. The inner diameter of the lower jig portion 200 is formed to be approximately similar to the outer diameter of the battery 11 under analysis, but may be sized to generate almost no friction when rotating freely.

[0049] A threaded wire may be formed on the upper part of the outer surface of the lower jig portion 200, and vertically extending wrinkles may be formed on the lower part. The user can rotate the lower jig portion 200 while gripping it to screw it onto the upper jig portion 100.

[0050] As shown in Figure 4, a battery insertion groove 110 into which a portion of the battery 11 is inserted may be formed on the bottom surface of the upper jig portion 100. The battery insertion groove 110 is cylindrical in shape and extends in the vertical direction, with a first inner diameter 111d formed from the bottom entrance to the first section 111, and a second inner diameter 112d formed from the first section 111 to the second section 112. The first inner diameter 111d and the second inner diameter 112d are larger than the outer diameter of the battery 11, and the first inner diameter 111d is larger than the second inner diameter 112d.

[0051] The sealing portion 300 is ring-shaped, and for example, the sealing portion 300 is an O-ring. The sealing portion 300 has a predetermined thickness in the first direction (r-direction in a cylindrical coordinate system). When this is set to a sealing thickness of 300t, the size of the first inner diameter 111d is greater than the sum of the outer diameter of the battery 11 under analysis and the sealing thickness 300t, and the size of the second inner diameter 112d is smaller than the sum of the outer diameter of the battery 11 and the sealing thickness 300t.

[0052] The material of the sealing portion 300 is a chemically resistant elastic material containing one or more of the following: silicone rubber, nitrile rubber, butadiene rubber, fluororubber, and ethylene propylene diene monomer rubber. The diameter (inner or outer diameter) of the sealing portion 300 is smaller than the outer diameter of the battery 11 when it is not installed on the battery 11, but when installed on the battery 11 to be analyzed, the elastic material stretches and adheres completely to the side surface of the battery 11. It is desirable that the material of the sealing portion 300 has a high coefficient of friction with the material of the case of the battery 11 to be analyzed in order to prevent the battery 11 from detaching from the gas collection device 10 during gas collection. The sealing thickness 300t is the length in the first direction when the sealing portion 300 is installed on the battery 11 and stretched. The sealing portion 300 adheres tightly to the ring-shaped step formed at the boundary between the first section 111 and the second section 112.

[0053] Screw threads are formed on the inner circumferential surface of the first section 111 of the battery insertion groove 110 and on the outer circumferential surface of the lower jig portion 200, and the upper end of the lower jig portion 200 is inserted into the battery insertion groove 110 and screwed in. As described above, the upper jig portion 100 and the lower jig portion 200 can be screwed together by rotating the lower jig portion 200 while the upper jig portion 100 is fixed.

[0054] As shown in Figure 3, a gas diffusion space 120 can be formed in the upper region of the battery insertion groove 110, that is, in the upper region of the second section.

[0055] The shape of the gas diffusion space 120 is disc-shaped, and the diameter 120d of the gas diffusion space 120 may be smaller than the diameter of the battery 11.

[0056] As shown in Figure 3, an arc-shaped auxiliary diffusion space 130 may be provided inside the upper jig portion 100, with an inner diameter 130d centered on the gas diffusion space 120 and larger than the diameter 120d of the gas diffusion space 120. Furthermore, the gas diffusion space 120 and the auxiliary diffusion space 130 are connected by a plurality of transport gas injection holes 131.

[0057] The gas transmission channel 510 is connected to the gas diffusion space 120, and the transported gas supply channel 410 is connected to the auxiliary diffusion space 130.

[0058] The central angle of the arc formed by the auxiliary diffusion space 130 is between 90° and 270°. Multiple transport gas injection holes 131 are formed and arranged at uniform intervals (angles) from one another. This allows the transport gas to be dispersed and injected radially, resulting in efficient gas transfer. However, if the central angle is excessively large, it may obstruct discharge into the gas transfer channel 510, and if the central angle is excessively small, it may obstruct uniform gas diffusion in the gas diffusion space 120.

[0059] The gas analyzer 20 using the gas collection device 10 described above includes a transport gas supply unit 400 that supplies transport gas to the gas diffusion space 120 of the gas collection device 10 through a transport gas supply channel 410; a mass flow rate control unit 600 that controls the flow rate of the transport gas; and a gas analyzer 500 that analyzes the gas transmitted from the gas diffusion space 120 through a gas transmission channel 510.

[0060] Figure 5 illustrates an example of a gas analyzer 20 using the gas collection device 10 according to the present invention.

[0061] The gas analyzer 20 in Figure 5 may include: a gas collection device 10 coupled to the upper end of the battery 11 to be analyzed; a condition-setting unit 900 coupled to the lower end of the battery 11 to be analyzed; a transport gas supply unit 400 that supplies transport gas to a gas diffusion space formed inside the gas collection device 10; a transport gas supply channel 410 that transmits the transport gas supplied by the transport gas supply unit 400 to the gas diffusion space; a mass flow rate control unit 600 provided in the transport gas supply channel 410 to control the amount of transport gas supplied to the gas diffusion space; a gas analyzer 500 that analyzes the target gas transmitted from the gas diffusion space; and a gas transmission channel 510 that transmits the target gas in the gas diffusion space to the gas analyzer 500.

[0062] The condition-setting unit 900 includes a charge / discharge unit for charging or discharging the battery 11 to be analyzed.

[0063] The gas analyzer 20 is equipped with a charge / discharge unit capable of charging or discharging a battery, allowing it to transmit gases generated under various charging (discharging) conditions while changing the State of Charge (SOC) of the battery 11 to be analyzed to the gas analysis unit 500 in real time.

[0064] The condition-setting unit 900 further includes, together with the charging / discharging unit, one or more of the following: a vibration unit, a striking unit, a heater unit, a cooling unit, a pressurizing unit, and a negative pressure unit.

[0065] The vibrating unit vibrates the battery 11 to be analyzed at a fixed time interval. For example, the vibrating unit is a device that can transmit sound waves or ultrasonic waves to the battery 11.

[0066] The striking part is capable of applying a physical impact to the battery 11 being analyzed. For example, the striking part causes a rigid body to collide with the battery 11 in an instant.

[0067] The heater unit supplies heat to the battery 11 to be analyzed. For example, the heater unit may be a coil heater, an infrared heater, an induction heater, or an dielectric heater.

[0068] The cooling unit removes thermal energy from the battery 11 being analyzed. For example, the cooling unit may be a chiller, liquid nitrogen, or the like.

[0069] The pressurizing section applies pressure to the surface of the battery being analyzed.

[0070] The negative pressure area is a vacuum chamber.

[0071] Furthermore, the gas analyzer 20 is equipped with a mass flow rate control unit 600, which allows the concentration of the analyte gas injected into the gas analysis unit 500 to be diluted to an appropriate level.

[0072] The gas analysis unit 500 includes one or more of the following: GC-MS (gas chromatography-mass spectroscopy), GC-PDD (gas chromatography-pulsed discharge detector), GC-TCD (gas chromatography-thermal conductivity detector), GC-FID (gas chromatography-flame ionization detector), FT-IR (Fourier transform infrared spectroscopy), and Raman spectroscopy.

[0073] The gas transmission channel 510 and the transported gas supply channel 410 include pipes, hoses, tubes, etc., for transmitting the gas.

[0074] The transport gas supply unit 400 is a gas cylinder in which inert gas is stored.

[0075] The mass flow control unit 600 is a mass flow controller (MFC). The mass flow control unit 600 can control the injection rate of the transported gas to create a gas concentration optimized for analysis by the gas analysis unit 500 and then transmit the analyte gas to the gas analysis unit 500.

[0076] Figure 6 illustrates the configuration of a gas analyzer according to another embodiment. The gas analyzer shown in Figure 6 includes a gas collection device 10 according to the present invention; a transport gas supply unit 400 connected to the transport gas supply channel 410; a mass flow rate control unit 600 that controls the amount of transport gas supplied to the gas diffusion space through the transport gas supply channel 410; a manifold unit 700 connected to the gas transmission channel 510; a vacuum pump unit 800 connected to the manifold unit 700; a pressure measuring unit 710 connected to the manifold unit 700; and a gas analyzer unit 500 connected to the manifold unit 700.

[0077] The gas analysis unit 500 includes GC-MS instruments, GC-PDD instruments, GC-TCD instruments, GC-FID instruments, and FT-IR instruments, among others.

[0078] The gas transmission channel 510 and the transported gas supply channel 410 include pipes, hoses, tubes, etc., for transmitting the gas.

[0079] The transport gas supply unit 400 is a gas cylinder in which inert gas is stored.

[0080] The manifold unit 700 is a multi-section pipe with internal passages that function as piping and numerous equipment connection ports on the outside.

[0081] The mass flow control unit 600 is a mass flow controller (MFC).

[0082] The vacuum pump unit 800 is selected from, for example, oil rotary pumps, Roots pumps, oil diffusion pumps, turbomolecular pumps, cryopumps, ion pumps, and the like.

[0083] The pressure measuring unit 710 is a pressure gauge.

[0084] Although embodiments of the present invention have been described above, these are merely illustrative, and those skilled in the art will understand that a wide variety of modifications and equivalent embodiments are possible. Therefore, the true scope of technical protection of the present invention must be determined by the claims. [Explanation of symbols]

[0085] 10: Gas collection device 11: Battery to be analyzed 100: Upper jig section 110: Battery insertion groove 111: Section 1 111d: 1st inner diameter 112: Section 2 112d: 2nd inner diameter 120: Gas diffusion space 120d: Diameter of the gas diffusion space 130: Auxiliary Diffusion Space 130d: Inner diameter of auxiliary diffusion space 131: Transport gas injection hole 200: Lower jig section 210: Battery through-hole 300: Sealing section 300t: Thickness of the sealing section 400: Transport gas supply unit 410: Transport gas supply channel 500: Gas Analysis Unit 510: Gas transport channel 600: Mass flow control unit 700: Manifold Unit 710: Pressure measurement unit 800: Vacuum pump unit 900: Conditional Unit

Claims

1. A gas collection device for collecting gases from a battery to be analyzed, A lower jig section with battery through-holes formed at both ends, A closed-loop sealing section located above the aforementioned lower jig section, An upper jig portion is provided with a battery insertion groove and a gas diffusion space, and is connected to the lower jig portion with the sealing portion in between, A gas collection device, including a gas collection device.

2. A cylindrical battery is inserted into the battery through-hole of the lower jig portion. The gas collection device according to claim 1, wherein the battery to be analyzed is capable of free rotation within the lower jig portion.

3. The lower jig portion is cylindrical in shape and extends in the vertical direction. The aforementioned battery through-hole penetrates the lower jig portion in the vertical direction. The gas collection device according to claim 2, wherein the vertical length of the lower jig portion is shorter than the vertical length of the battery to be analyzed.

4. The battery insertion groove is formed on the surface of the upper jig portion that is in contact with the sealing portion. The aforementioned battery insertion groove is It is cylindrical in shape, extending in the vertical direction. It includes a first section having a first inner diameter and a second section having a second inner diameter, The first inner diameter and the second inner diameter are larger than the outer diameter of the battery to be analyzed. The gas collection device according to any one of claims 1 to 3, wherein the first inner diameter is larger than the second inner diameter.

5. The sealing portion is ring-shaped with a predetermined thickness, The size of the first inner diameter is greater than the sum of the outer diameter of the battery under analysis and the thickness of the sealing portion. The length of the second inner diameter is smaller than the sum of the outer diameter of the battery under analysis and the thickness of the sealing portion. The gas collection device according to claim 4, wherein the sealing portion is in close contact with the step formed at the boundary between the first section and the second section.

6. Screw threads are formed on the inner circumferential surface of the first section and the outer circumferential surface of the lower jig section. The gas collection device according to claim 4, wherein the lower jig portion is screwed into the battery insertion groove.

7. The gas collection device according to claim 4, wherein the gas diffusion space is formed in the upper region of the second section of the battery insertion groove.

8. The aforementioned gas diffusion space is disk-shaped, The gas collection device according to claim 7, wherein the diameter of the gas diffusion space is smaller than the diameter of the battery to be analyzed.

9. The upper jig portion further comprises an arc-shaped auxiliary diffusion space having a predetermined width, which is spaced apart from the gas diffusion space with the center of the gas diffusion space as its center, The aforementioned gas diffusion space and the aforementioned auxiliary diffusion space are connected by a plurality of transport gas injection holes. The gas collection device according to claim 8, further comprising a gas transfer channel connected to the gas diffusion space and a transport gas supply channel connected to the auxiliary diffusion space.

10. The gas collection device according to claim 9, wherein the magnitude of the central angle of the arc formed by the auxiliary diffusion space is 90° to 270°.

11. A gas collection device according to claim 1, A transport gas supply unit that supplies transport gas to the gas diffusion space of the gas collection device through a transport gas supply channel, A mass flow control unit for controlling the flow rate of the transported gas, A gas analysis unit for analyzing the gas transmitted from the gas diffusion space through the gas transmission channel, A gas analyzer, including a gas analyzer.

12. The gas analyzer according to claim 11, further comprising a condition-setting unit that is coupled to the exposed lower end of a battery when a battery is inserted into the battery through-hole of the lower jig portion.

13. The gas analyzer according to claim 12, wherein the condition-setting unit includes a charge / discharge unit for charging or discharging a battery.

14. The gas analyzer according to claim 13, wherein the condition-applying unit further includes one or more selected from a vibrating section, a striking section, a heater section, a cooling section, a pressurizing section, and a negative pressure section.

15. The aforementioned gas transmission passage is equipped with a manifold unit. The gas analysis apparatus according to claim 11, wherein the gas analysis unit is connected to the manifold unit and further includes a vacuum pump unit connected to the manifold unit and a pressure measuring unit connected to the manifold unit.

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