Gas removal device for battery cells

Abstract

The gas removal device of a battery cell according to an embodiment of the present invention may include: a gas suction part that provides a negative pressure; a first tubular member connected to the gas suction part and having at least one suction port formed in the radial direction; a second tubular member connected to the gas suction part and configured to be combinable with the first tubular member; and a hemispherical cover respectively combined with the first tubular member and the second tubular member, the hemispherical cover including a first cover combined with the first tubular member and a second cover combined with the second tubular member, the first cover and the second cover being arranged such that when the first tubular member and the second tubular member are combined, the openings of the first cover and the second cover face each other, and the suction port is provided between the first cover and the second cover.

Description

Technical Field

[0001] The present invention relates to a gas removal device for a battery cell. Background Art

[0002] Unlike primary batteries, secondary batteries such as battery cells can be charged and discharged, and thus can be applied to various fields such as digital cameras, mobile phones, laptop computers, and hybrid vehicles. Secondary batteries may include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-hydrogen batteries, and lithium secondary batteries, etc.

[0003] Generally, a secondary battery is formed by stacking a cathode, a separator, and an anode. In addition, materials for the secondary battery are selected considering battery life, charge / discharge capacity, temperature characteristics, and stability, etc.

[0004] According to the material of the housing that houses the electrode assembly, secondary batteries are classified into pouch-type secondary batteries and can-type secondary batteries, etc. A pouch-type secondary battery houses the electrode assembly in a pouch made of a flexible polymer material with an unfixed shape. And, a can-type secondary battery houses the electrode assembly in a housing made of materials such as metal or plastic with a fixed shape.

[0005] The pouch that is the housing of the pouch-type secondary battery is made of an outer packaging material with a flexible material.

[0006] For a pouch-type secondary battery, a process of removing gas formed in the internal space of the pouch during the manufacturing process (degassing) is performed.

[0007] In the prior art, gas is removed after the battery cell is set in a separately manufactured chamber, but this method has a problem that the productivity of the product is very low.

[0008] Therefore, a gas removal device that can improve productivity is needed. Summary of the Invention

[0009] (1) Technical Problem to be Solved

[0010] An object of the present invention is to provide a gas removal device for a battery cell that can improve productivity.

[0011] (2) Technical Solution

[0012] The gas removal device of a battery cell according to an embodiment of the present invention may include: a gas suction part that provides negative pressure; a first tubular member connected to the gas suction part and having at least one suction port formed radially; a second tubular member connected to the gas suction part and configured to be combinable with the first tubular member; and a hemispherical cover respectively combined with the first tubular member and the second tubular member, the hemispherical cover including a first cover combined with the first tubular member and a second cover combined with the second tubular member, the first cover and the second cover being arranged such that when the first tubular member and the second tubular member are combined, the openings of the first cover and the second cover face each other, and the suction port is provided between the first cover and the second cover.

[0013] In this embodiment, the end of the first tubular member may be formed sharply.

[0014] In this embodiment, the first tubular member penetrates the gas chamber and is combined with the second tubular member, and the hemispherical cover may be closely attached to the exterior material forming the gas chamber to isolate the internal space of the gas chamber from the external space of the gas chamber.

[0015] In this embodiment, when the first tubular member penetrates the gas chamber and is combined with the second tubular member, the suction port may be provided inside the gas chamber.

[0016] In this embodiment, the hemispherical cover may be arranged such that the plane provided with the opening is orthogonal to the length direction of the first tubular member or the second tubular member.

[0017] In this embodiment, the gas removal device of the battery cell may further include a close - fitting plate attached to the opening of the hemispherical cover.

[0018] In this embodiment, the gas removal device of the battery cell may further include a suction pipe that connects the first tubular member and the second tubular member to the gas suction part respectively.

[0019] In this embodiment, the first tubular member may be formed such that the outer diameter of its end is equal to or less than the inner diameter of the end of the second tubular member.

[0020] In this embodiment, the end of the first tubular member may be inserted into the inside of the second tubular member and combined with the second tubular member.

[0021] In this embodiment, when the second tubular member is combined with the first tubular member, the internal space of the second tubular member may be connected to the internal space of the first tubular member.

[0022] In this embodiment, the end of the second tubular member may be disposed within the second cap.

[0023] (III) Advantageous Effects

[0024] Since the gas removal device according to an embodiment of the present invention does not require placing the gas chamber within the chamber as in the prior art, the equipment for removing gas can be minimized. Additionally, since the process of disposing the gas chamber within the chamber can be omitted, the processing time is also shortened.

[0025] Furthermore, as the gas within the gas chamber is removed, the external pressure of the hemispherical cap becomes greater than the internal pressure of the hemispherical cap. Thus, the hemispherical cap of this embodiment adheres tightly to the exterior material as the gas is removed. Accordingly, during the gas removal process, it is possible to prevent external air from flowing into the gas chamber side due to a gap forming between the exterior material and the hemispherical cap.

[0026] In addition, since the suction port remains within the gas chamber until the end of gas removal, even if the size of the gas chamber becomes very small as the gas is removed, the gas within the gas chamber can be effectively removed through the suction port located within the gas chamber and the hemispherical cap.

[0027] Moreover, since the suction port is formed in the radial direction of the through member, even if the volume of the gas chamber decreases, the suction port will not be blocked, thereby enabling effective gas removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a perspective view schematically showing a battery cell according to an embodiment of the present invention.

[0029] Figure 2 is a view schematically showing the state before removing the gas chamber during the manufacturing Figure 1 of the battery cell.

[0030] Figure 3 is a view schematically showing a gas removal device according to an embodiment of the present invention.

[0031] Figures 4 to 7 is a view for explaining the operation of the gas removal device according to this embodiment.

[0032] DESCRIPTION OF REFERENCE NUMERALS

[0033] 10: Battery cell

[0034] 100: Gas removal device

[0035] 110: Gas suction part

[0036] 120: Suction pipe

[0037] 130: Penetrating component

[0038] 140: First tubular component

[0039] 150: Second tubular component

[0040] 147, 157: Hemispherical cover

[0041] 170: Adjacent plate Detailed implementation mode

[0042] Before describing the present invention in detail, the terms or words used in the following description of this specification and claims should not be construed as limited to the general meaning or dictionary meaning, but should be construed as meanings consistent with the technical idea of the present invention based on the principle that the inventor can appropriately define the concept of the term to best illustrate his own invention. Therefore, it should be understood that the embodiments described in this specification and the structures shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all the technical ideas of the present invention. At the time of filing this application, there may be various equivalents and modified examples that can replace them.

[0043] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. At this time, in the drawings, the same components are denoted by the same reference numerals as much as possible. In addition, detailed descriptions of known functions and structures that may obscure the subject matter of the present invention are omitted. For the same reason, some components in the drawings are enlarged, omitted or schematically shown, and the dimensions of each component do not exactly reflect the actual dimensions.

[0044] For example, in this specification, expressions such as upper side, upper part, lower side, lower part, side surface, etc. are described based on the illustrations in the drawings, and if the direction of the object changes, they may be represented in different ways.

[0045] Figure 1 is a perspective view schematically showing a battery cell according to an embodiment of the present invention.

[0046] Refer to Figure 1 , the battery cell 10 may be configured in a form in which an electrode assembly (not shown) is accommodated in the bag 11.

[0047] The electrode assembly has a plurality of electrode plates and electrode connectors and is accommodated in the bag 11. Here, the electrode plates are composed of a cathode plate and an anode plate, and the electrode assembly may be configured in such a form that the cathode plate and the anode plate are stacked so that wide surfaces face each other and there is a separator between the cathode plate and the anode plate.

[0048] The cathode plate and the anode plate are formed in a structure where an active material slurry is coated on a current collector, and generally, the slurry can be formed by stirring in a state where granular active materials, auxiliary conductors, binders, plasticizers, and other solvents are added.

[0049] In addition, in the electrode assembly, a plurality of cathode plates and a plurality of anode plates are stacked in the vertical direction. At this time, each of the plurality of cathode plates and the plurality of anode plates may be provided with an electrode joint, and the same polarities may be in contact with each other and connected to the same electrode lead 15.

[0050] In this embodiment, two electrode leads 15 are provided to face in opposite directions to each other.

[0051] The bag 11 may be formed in a container shape to provide an internal space for accommodating the electrode assembly and an electrolyte (not shown). At this time, a part of the electrode lead 15 of the electrode assembly may be exposed to the outside of the bag 11.

[0052] The bag 11 may be divided into a sealing part 202 and a housing part 204.

[0053] The housing part 204 is formed in a container shape to provide a rectangular internal space. The electrode assembly and the electrolyte may be accommodated in the internal space of the housing part 204.

[0054] The sealing part 202 is a part that seals the edge of the housing part 204 by joining a part of the bag 11. Therefore, the sealing part 202 may be formed in a flange shape extending outward from the housing part 204 formed in a container shape, and thus the sealing part 202 may be provided along the periphery of the housing part 204.

[0055] The bag 11 may be joined by a heat fusion method, but is not limited thereto.

[0056] In addition, in this embodiment, the sealing part 202 may be divided into a first sealing part 2021 provided with the electrode lead 15 and a second sealing part 2022 not provided with the electrode lead 15.

[0057] In this embodiment, the bag 11 is formed by molding a single external material. More specifically, after molding one or two storage parts in one outer packaging material, the bag 11 may be completed by folding the outer packaging material so that the storage parts form a space (i.e., the housing part).

[0058] In this embodiment, the accommodating part 204 can be formed as a rectangle. Additionally, a sealing part 202 formed by joining an exterior material can be provided around the accommodating part 204. However, as described above, it is not necessary to form the sealing part 202 on the surface where the exterior material is folded. Therefore, in this embodiment, the sealing part 202 is formed around the accommodating part 204, is provided only on three surfaces of the accommodating part 204, and may not be provided on any one of the surfaces around the accommodating part ( Figure 3 the lower surface in

[0059] In this embodiment, since the electrode leads 15 are arranged to face opposite directions to each other, the two electrode leads 15 can be provided on the sealing parts 202 formed on different sides. Therefore, the sealing part 202 of this embodiment can be composed of two first sealing parts 2021 provided with the electrode leads 15 and one second sealing part 2022 not provided with the electrode leads 15.

[0060] The battery cell 10 constructed as described above can be a battery capable of charging and discharging. Specifically, it can be a lithium-ion (Li-ion) battery or a nickel-metal hydride (Ni-MH) battery.

[0061] Figure 2 is a diagram schematically showing the state before removing the gas chamber during the process of manufacturing Figure 1 the battery cell.

[0062] During the manufacturing process of the above-mentioned pouch-type battery cell 10, as Figure 2 shown, the accommodating part 204 provided with the electrode assembly and the gas chamber 208 for collecting the gas generated from the accommodating part 204 can be provided inside the pouch 11 serving as the exterior material. Here, the gas chamber 208 is a space for accommodating the gas generated during the manufacturing process of the battery cell 10, and can be a part that is finally removed after all the gas is removed.

[0063] Therefore, a gas passage part 209 for moving the gas in the accommodating part 204 to the gas chamber 208 can be provided between the accommodating part 204 and the gas chamber 208.

[0064] When the gas generated in the accommodating part 204 moves to the gas chamber 208, the gas in the gas chamber 208 can be removed using the gas removal device 100 according to this embodiment.

[0065] Figure 3 is a diagram schematically showing the gas removal device according to an embodiment of the present invention.

[0066] Referring to Figure 3, the gas removal device 100 according to this embodiment may include a gas suction part 110, a suction pipe 120, and a through member 130. The gas suction part 110 can provide negative pressure to suck the gas inside the suction pipe 120 and the through member 130. Therefore, the gas suction part 110 can use various devices as long as they can suck gas and keep the inside of the suction pipe 120 at negative pressure.

[0067] One end of the suction pipe 120 may be connected to the gas suction part 110, and the other end may be connected to the through member 130. Therefore, the suction pipe 120 can be formed in various shapes as long as it can transfer the gas sucked from the through member 130 to the gas suction part 110 without leakage.

[0068] In this embodiment, the suction pipe 120 may include a first pipe 120a connected to the first tubular member 140 and a second pipe 120b connected to the second tubular member 150.

[0069] The through member 130 may be coupled to the end of the suction pipe 120 and inserted into the gas chamber 208 to suck the gas inside the gas chamber 208.

[0070] For this purpose, the through member 130 may include a first tubular member 140 and a second tubular member 150 that are coupled to each other.

[0071] Both the first tubular member 140 and the second tubular member 150 may have a tubular body with an empty interior. Additionally, in this embodiment, at least a part of the first tubular member 140 may be inserted into the second tubular member 150.

[0072] For this purpose, the first tubular member 140 may be formed such that the outer diameter of its end is equal to or smaller than the inner diameter of the end of the second tubular member 150. However, it is not limited thereto and can be variously deformed. For example, it can be configured such that the second tubular member 150 is inserted into the interior of the first tubular member 140, or configured such that the ends of the first tubular member 140 and the second tubular member 150 are joined to each other.

[0073] The end of the first tubular member 140 may be formed in a sharp shape so that the first tubular member 140 can be more easily inserted into the second tubular member 150.

[0074] The first tubular member 140 may include at least one suction port 142.

[0075] The suction port 142 is formed on the side of the first tubular member 140 and is formed in the form of a through hole along the radial direction of the first tubular member 140. Therefore, the internal space of the first tubular member 140 can be connected to the outside through the suction port 142.

[0076] A plurality of suction inlets 142 may be provided along the outer peripheral surface of the first tubular member 140.

[0077] The suction inlet 142 may be inserted and provided in the gas chamber 208 and serve as an inlet for the inhaled gas. Therefore, the suction inlet 142 may be formed to have a size smaller than the thickness of the gas chamber 208 so that the suction inlet 142 can be completely inserted into the interior of the gas chamber 208.

[0078] When the suction inlet is provided at the end of the first tubular member 140, when the volume of the gas chamber 208 shrinks during the process of removing the gas in the gas chamber 208, the suction inlet may be blocked by the exterior material, making it difficult to smoothly remove the gas.

[0079] However, as in this embodiment, when the suction inlet 142 is formed in the radial direction of the through member 130, even if the volume of the gas chamber 208 shrinks, it is difficult for the exterior material to block the suction inlet 142, so the gas can be effectively removed.

[0080] When the first tubular member 140 is completely coupled to the second tubular member 150, the suction inlet 142 may not be inserted into the interior of the second tubular member 150 and may be located outside the second tubular member 150. Therefore, even when the first tubular member 140 is coupled to the second tubular member 150, gas can be continuously inhaled.

[0081] In addition, the through member 130 according to this embodiment may include hemispherical caps 147, 157.

[0082] The hemispherical caps 147, 157 may include a first cap 147 provided on the first tubular member 140 and a second cap 157 provided on the second tubular member 150. The first cap 147 and the second cap 157 may be arranged such that their openings face each other when the first tubular member 140 and the second tubular member 150 are coupled.

[0083] In addition, when the first tubular member 140 and the second tubular member 150 are completely coupled and the openings of the first cap 147 and the second cap 157 are arranged very close to each other, the two hemispherical caps 147, 157 may form a sphere as a whole.

[0084] When the through member 130 is inserted and provided in the gas chamber 208, the openings of the hemispherical caps 147, 157 may be closely attached to the outer surface of the gas chamber 208. Therefore, since the internal space of the gas chamber 208 is completely isolated from the external environment by the hemispherical caps 147, 157, the gas located inside the gas chamber 208 and inside the hemispherical caps 147, 157 can only be removed through the suction inlet 142.

[0085] For this reason, the hemispherical caps 147 and 157 can be arranged such that the plane provided with the opening is orthogonal to the longitudinal direction of the first tubular member 140 or the second tubular member 150.

[0086] In addition, in the present embodiment, the first tubular member 140 and the second tubular member 150 are provided at the center of the opening of the hemispherical caps 147 and 157, but the configuration of the present invention is not limited thereto.

[0087] The pressure of the hemispherical shape is not concentrated at a specific position but is evenly distributed as a whole. Therefore, when the caps 147 and 157 are configured in a hemispherical shape as in the present embodiment, even if the pressure inside the gas chamber 208 decreases, deformation or damage of the hemispherical caps 147 and 157 due to pressure changes can be suppressed.

[0088] In the present embodiment, since the first tubular member 140 is configured to penetrate the gas chamber 208, a specific portion protrudes from the first cap 147. The distance between the end of the protruding first tubular member 140 and the first cap 147 can be formed to be longer than the thickness of the gas chamber 208.

[0089] On the other hand, when the opening of the first cap 147 and the suction port 142 are provided on the same plane, due to the thickness of the exterior material, the suction port 142 cannot entirely enter the inside of the gas chamber 208. Therefore, in the present embodiment, the suction port 142 can be arranged at a distance from the plane provided with the opening of the first cap 147. More specifically, the suction port 142 can be spaced from the plane formed by the opening of the first cap 147 toward the end side of the first tubular member 140 by a distance greater than or equal to the thickness of the exterior material.

[0090] In addition, in the present embodiment, the end of the second tubular member 150 is not inserted into the inside of the gas chamber 208. Therefore, the end of the second tubular member 150 can be arranged on the same plane as the opening of the second cap 157 or in the internal space of the second cap 157 such that the opening of the second cap 157 can be firmly attached to the outer surface of the gas chamber 208.

[0091] In addition, the adhering plate 170 can be attached to the surface in contact with the gas chamber 208 at the opening of the hemispherical caps 147 and 157. The adhering plate 170 has an elastic restoring force like rubber and can be formed of a material capable of sealing between the hemispherical caps 147 and 157 and the bag 11.

[0092] Therefore, the adhering plate 170 can increase the sealing force between the internal space of the hemispherical caps 147 and 157 and the bag 11 forming the gas chamber 208. Thus, the outflow or inflow of gas or air between the hemispherical caps 147 and 157 and the bag 11 can be blocked.

[0093] Next, the operation of the gas removal device 100 according to the present embodiment will be described.

[0094] Figures 4 to 6 It is a diagram for explaining the operation of the gas removal device according to the present embodiment.

[0095] First, as Figure 4 shown, when the gas chamber 208 is filled with gas, the first tubular member 140 is inserted into the gas chamber 208.

[0096] As described above, since the end of the first tubular member 140 is formed sharply, the first tubular member 140 can easily cut the outer packaging material and be inserted into the interior of the gas chamber 208.

[0097] In this step, the first tubular member 140 completely penetrates the gas chamber 208, so the end of the first tubular member 140 can penetrate the gas chamber 208 to be disposed outside the gas chamber 208.

[0098] Subsequently, as Figure 5 shown, the end of the first tubular member 140 is inserted into the interior of the second tubular member 150, and the first tubular member 140 and the second tubular member 150 are joined. Thus, the internal space of the second tubular member 150 can be connected to the internal space of the first tubular member 140.

[0099] The hemispherical caps 147, 157 can contact the outer surface of the gas chamber 208, and the first tubular member 140 and the second tubular member 150 can be joined until the hemispherical caps 147, 157 are pressed tightly against the bag 11.

[0100] Therefore, the suction port 142 of the first tubular member 140 is disposed inside the gas chamber 208, and the internal space of the gas chamber 208 can be isolated from the outside through the hemispherical caps 147, 157.

[0101] In this process, the first tubular member 140 and the second tubular member 150 can be pressed against each other with a predetermined force. Here, the predetermined force refers to a force at a level that can maintain the pressing force between the bag 11 and the hemispherical caps 147, 157.

[0102] Subsequently, the gas inside the gas chamber 208 is inhaled through the gas suction unit 110. With the driving of the gas suction unit 110, a negative pressure is generated in the suction pipe 120. Therefore, the gas located inside the gas chamber 208 can be inhaled into the suction unit 110 through the suction port 142 and the suction pipe 120.

[0103] During this process, the gas or air provided within the hemispherical covers 147, 157 can also move inside the gas chamber 208 through the first tubular member 140 and through the holes formed in the bag 11 of the gas chamber 208, that is, the gap between the bag 11 and the first tubular member 140, and is then sucked in through the suction port 142.

[0104] On the other hand, as Figure 6 and Figure 7 shown, as the gas within the gas chamber 208 is removed, the gap between the exterior materials forming the gas chamber 208 can be reduced. However, as described above, since the first tubular member 140 and the second tubular member 150 are pressed against each other with a predetermined force, when the gap between the exterior materials is reduced, the gap between the first cover 147 and the second cover 157 is also reduced. Therefore, the close contact force between the bag 11 and the hemispherical covers 147, 157 can be continuously maintained.

[0105] In addition, since the external pressure of the hemispherical covers 147, 157 becomes greater than the internal pressure of the hemispherical covers 147, 157 as the gas within the gas chamber 208 is removed, the hemispherical covers 147, 157 of the present embodiment can be closely attached to the exterior materials due to the pressure difference as the gas is removed. Therefore, during the process of removing the gas, it is possible to prevent external air from flowing into the gas chamber 208 side due to the formation of a gap between the exterior materials and the hemispherical covers 147, 157.

[0106] Furthermore, as Figure 7 shown, the suction port 142 is located within the gas chamber 208 until the end when removing the gas. In addition, since the suction port 142 is formed in the radial direction of the through member 130, even if the volume of the gas chamber 208 is reduced, the suction port 142 will not be blocked by the exterior materials. Therefore, even when the size of the gas chamber 208 becomes very small as the gas is removed, the gas within the gas chamber 208 can be effectively removed through the suction port 142 located within the gas chamber 208 and the hemispherical covers 147, 157.

[0107] When all the gas within the gas chamber 208 is removed, the gas passage portion 209 connecting the gas chamber 208 and the accommodating portion 204 is cut off, and then the gas chamber 208 is removed to complete the battery cell 10.

[0108] The gas passage portion 209 can be cut off by joining the exterior materials to each other by methods such as heat welding, but it is not limited thereto.

[0109] In one embodiment, the gas removal device can have a plurality of through members 130. For example, the gas can be removed by simultaneously joining a plurality of through members 130 to one gas chamber 208.

[0110] In addition, in one embodiment, in the gas removal device, the plurality of through members 130 may have different sizes (or diameters). In this case, the through members 130 can be selectively used according to the size of the gas chamber 208.

[0111] Since the gas removal device according to the present embodiment does not require placing the gas chamber 208 inside a chamber as in the prior art, the equipment for removing gas can be minimized. In addition, since the process of disposing the gas chamber 208 inside the chamber or removing the gas chamber 208 from inside the chamber can be omitted, the processing time is also shortened.

[0112] In addition, an air inlet 142 for inhaling gas is provided inside the gas chamber 208, and hemispherical covers 147, 157 are provided outside the gas chamber 208 to block the inflow of external air into the gas chamber 208. Therefore, as the gas in the gas chamber 208 is removed, even if the bags 11 forming the gas chamber 208 approach each other, the remaining gas can be effectively removed.

[0113] Furthermore, due to the use of the hemispherical covers 147, 157, even if the internal pressure of the hemispherical covers 147, 157 decreases, deformation of the hemispherical covers 147, 157 can be prevented, and during the gas removal process, the inflow of external air into the gas chamber 208 due to the separation or detachment of the hemispherical covers 147, 157 from the bags 11 can be prevented.

[0114] The battery cell manufactured using the above gas removal device can be used as a power source for small devices and can also be used as a unit cell for medium and large battery modules.

[0115] In addition, the present invention can provide a battery pack including the above battery module as a power source for medium and large devices. The above medium and large devices may include electric vehicles such as electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs), and power storage devices, etc., but are not limited thereto.

[0116] Although the embodiments of the present invention have been described in detail above, the scope of the rights of the present invention is not limited to the above embodiments, and those of ordinary skill in the art to which the present invention pertains can make various modifications and deformations without departing from the technical idea of the present invention described in the claims.

Claims

1. A gas removal device for a battery cell, comprising: A gas suction part that provides negative pressure; A first tubular member connected to the gas suction part and having at least one suction port formed radially; A second tubular member connected to the gas suction part and configured to be combined with the first tubular member; And A hemispherical cover respectively combined with the first tubular member and the second tubular member, The hemispherical cover includes a first cover combined with the first tubular member and a second cover combined with the second tubular member, The first cover and the second cover are arranged such that when the first tubular member and the second tubular member are combined, the openings of the first cover and the second cover face each other, and the suction port is arranged between the first cover and the second cover, The first tubular member penetrates through the gas chamber and is combined with the second tubular member, When the first tubular member penetrates through the gas chamber and is combined with the second tubular member, the suction port is arranged inside the gas chamber.

2. The gas removal device for a battery cell according to claim 1, wherein, The end of the first tubular member is formed sharply.

3. The gas removal device for a battery cell according to claim 1, wherein, The hemispherical cover is closely attached to the exterior material forming the gas chamber to isolate the internal space of the gas chamber from the external space of the gas chamber.

4. The gas removal device for a battery cell according to claim 1, wherein, The hemispherical cover is arranged such that the plane provided with the opening is orthogonal to the length direction of the first tubular member or the second tubular member.

5. The gas removal device for a battery cell according to claim 1, further comprising: A closely attached plate attached to the opening of the hemispherical cover.

6. The gas removal device for a battery cell according to claim 1, further comprising: A suction pipe connecting the first tubular member and the second tubular member to the gas suction part respectively.

7. The gas removal device for a battery cell according to claim 1, wherein, The first tubular member is formed such that the outer diameter of its end is equal to or smaller than the inner diameter of the end of the second tubular member.

8. The gas removal device for a battery cell according to claim 1, wherein, The end of the first tubular member is inserted into the inside of the second tubular member and combined with the second tubular member.

9. The gas removal device for a battery cell according to claim 1, wherein, When the second tubular member is combined with the first tubular member, the internal space of the second tubular member is connected to the internal space of the first tubular member.

10. The gas removal device for a battery cell according to claim 1, wherein, The end of the second tubular member is arranged inside the second cover.

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