Apparatus and method for sealing pouch type battery case

Abstract

The present invention relates to an apparatus and a method for sealing a pouch type battery case and, more specifically, to an apparatus and a method for sealing a pouch type battery case in which an electrode assembly is embedded in a battery case composed of a first case and a second case, and which comprises a non-contact heating member which is positioned above or below a sealing portion where the first case and the second case overlap, and heats the sealing portion to a predetermined temperature so that the sealing portion can be thermally fused.

Description

Sealing device and sealing method for pouch-type battery case

[0001] This application claims the benefit of priority to Korean Patent Application No. 2023-0085018, filed June 30, 2023, and Korean Patent Application No. 2024-0050041, filed April 15, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a sealing device and a sealing method for a pouch-type battery case. Specifically, the present invention relates to a sealing device and a sealing method for a pouch-type battery case, which includes a support die and a non-contact heating member for heating a sealing portion of the pouch-type battery case.

[0003]

[0004] As the need to address environmental pollution becomes more urgent, industry is increasingly interested in reducing greenhouse gas emissions. Consequently, extensive research is being conducted on lithium secondary batteries, a type of eco-friendly energy source, as an alternative to fossil fuels.

[0005] Lithium secondary batteries are classified into pouch-type secondary batteries made of laminated sheets, cylindrical secondary batteries made of metal materials, and square secondary batteries depending on the type of outer packaging material. Pouch-type secondary batteries have the advantages of being easy to change shape, easy to manufacture, and having low manufacturing costs.

[0006] A pouch-type secondary battery comprises an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, housed within a pouch-type battery case made of a laminated sheet. At this time, a positive electrode lead and a negative electrode lead are connected to each of the positive electrode tabs and negative electrode tabs constituting the positive electrode and the negative electrode, and then extended so as to be exposed to the outside of the pouch-type battery case.

[0007] Meanwhile, the pouch-type battery case is composed of a first case and a second case that accommodate an electrode assembly therein. The first case and the second case are made of a laminate structure including an outer resin layer that protects the electrode assembly from the outside, a metal layer for blocking air and moisture, and an inner resin layer for heat-sealing.

[0008] The first case and the second case are arranged so that their respective inner resin layers face each other, and the positive and negative leads are arranged so that they penetrate the outer periphery of the first case and the second case, and the outer periphery is heat-welded to form a sealing portion.

[0009] In order to increase the sealing force between the positive and negative electrode leads and the pouch-type battery case, a lead film may be attached to the upper and lower surfaces of each of the positive and negative electrode leads.

[0010] Figure 1 is a front view illustrating the process of sealing a conventional pouch-type battery case.

[0011] Referring to FIG. 1, a pouch-type battery cell accommodates an electrode assembly (20) inside a battery case (10), and the battery case (10) includes a first case (11) that accommodates the electrode assembly (20), and a second case (12) that is placed on the upper surface of the first case (11) and is heat-fused to the first case (11).

[0012] At this time, the first case (11) and the second case (12) are composed of a laminate sheet including an outer resin layer that protects the electrode assembly (20) from the outside, a metal layer for blocking air and moisture, and an inner resin layer for heat-sealing.

[0013] The positive electrode lead (21) combined with the positive electrode tab of the electrode assembly (20) protrudes outward by penetrating the outer periphery of the battery case (10) with the lead film (23) attached to the upper and lower surfaces.

[0014] In order to form a sealing portion of a battery case (10), the outer periphery of the battery case (10) is placed between a pair of sealing tools (30) consisting of a first sealing tool (31) and a second sealing tool (32). Then, when the outer periphery of the battery case (10) is pressed by the first sealing tool (31) and the second sealing tool (32) heated to a certain temperature, the inner resin layers of the first case (11) and the second case (12) are melted and thermally bonded to each other to form a sealing portion.

[0015] At this time, in order to prevent the sealing force of the outer periphery of the battery case (10) from being reduced due to the difference in thickness between the positive lead (21) and the lead film (23), a first recessed portion (31a) may be formed in the first sealing tool (31) and a second recessed portion (32a) may be formed in the second sealing tool (32) to correspond to the thickness of the positive lead (21) and the lead film (23).

[0016] However, if the step of the first recessed portion (31a) and the step of the second recessed portion (32a) do not exactly match the thickness of the positive electrode lead (21) and the lead film (23), the first case (11) and the second case (12) may not be securely attached, resulting in a gap, and the electrolyte may leak through this gap.

[0017] In addition, if a foreign substance adheres to the sealing tool (30), not only may the battery case be damaged by the foreign substance during the pressurizing process, but a sealing temperature deviation may also occur in the part of the pressurizing surface of the sealing tool (30) where the foreign substance adheres.

[0018] In order to prevent problems when using a contact sealing tool that directly pressurizes the battery case, Patent Document 1 discloses a process of forming a sealing portion by irradiating infrared rays to the sealing portion, which is the outer surface of the electrode assembly receiving portion.

[0019] Patent Document 1 can prevent sealing failures caused by differences in the step of the sealing tool and the thickness of the electrode lead by heating the area to be sealed in a non-contact manner, but has a new problem in that heat may be applied to areas other than the area to be sealed because it is not easy to control the heating area.

[0020]

[0021] (Prior art literature)

[0022] (Patent Document 1) Korean Patent Publication No. 10-1216423

[0023]

[0024] The present invention is intended to solve the above-mentioned problem, and it is an object of the present invention to provide a sealing device and a sealing method for a pouch-type battery case that can seal in a non-contact manner by selectively heating the sealing portion of the pouch-type battery case.

[0025] In addition, the present invention aims to provide a sealing device and a sealing method for a pouch-type battery case, which can easily adjust the heating position and heating area to correspond to changes in the width of the sealing portion of the pouch-type battery case.

[0026]

[0027] To achieve this purpose, a sealing device for a pouch-type battery case according to the present invention may include an electrode assembly (20) built into a battery case (10) composed of a first case (11) and a second case (12), and a non-contact heating member (200) positioned above or below a sealing portion (S) where the first case (11) and the second case (12) overlap each other to heat the sealing portion (S) to a certain temperature so that the sealing portion (S) can be thermally fused.

[0028] The above heating member (200) includes a heater (210) having a predetermined length, and a cover (220) that surrounds the heater (210), wherein the cover (220) may include a first cover (221) that surrounds the longitudinal side of the heater (210), the widthwise side, and the side opposite to the direction in which the sealing portion (S) is arranged, and a second cover (222) that extends downward by a predetermined length from the longitudinal side of the first cover (221).

[0029] The above heating member (200) can be positioned above and below the sealing portion (S), respectively.

[0030] The above second cover (222) may be made of a material that can be deformed inward or outward.

[0031] The above first cover (221) and second cover (222) may be made of a material selected from the group consisting of glass insulation, mineral insulation, metallic insulation, and carbon insulation.

[0032] A heat-reflective coating layer may be provided on the inner surface of the first cover (221) and the second cover (222).

[0033] The above first cover (221) and the above second cover (222) can be connected by a rotating member (223).

[0034] The above rotating member may be a hinge axis.

[0035] The second cover (222) is separated from the first cover (221) and can move along the width direction of the first cover (221).

[0036] A first flange (221a) extending in the width direction of the first cover (221) may be provided on the longitudinal edge of the first cover (221).

[0037] A second flange (222a) extending in the width direction of the first cover (221) may be provided on the longitudinal upper edge of the second cover (222).

[0038] It further includes a temperature sensor (300) for measuring the temperature of the sealing portion (S), and the temperature sensor (300) is located inside the cover (220), but can be arranged to face the sealing portion (S).

[0039] A method for sealing a pouch-type battery case according to the present invention may include a first step of determining a position of a sealing portion (S) in which an electrode assembly (20) is built into a battery case (10) composed of a first case (11) and a second case (12), where the first case (11) and the second case (12) overlap, a second step of controlling the output of a non-contact heating member (200) so that heat can reach at least one of a first surface and a second surface of the sealing portion (S), and a third step of measuring whether the sealing portion (S) has reached a set temperature.

[0040] Before the first step, a step of securing the set temperature of the third step may be further included.

[0041] A sealing method for a pouch-type battery case, characterized in that in the second step, the output of a non-contact heating member (200) is adjusted so that heat can reach the first and second surfaces of the sealing portion (S).

[0042] The second step may further include a step of controlling the area on which heat reaches the first or second surface.

[0043] The temperature measured in the third step may be the temperature of the first or second surface of the sealing portion to which the heat of the heating element directly reaches.

[0044] The present invention can also be provided in a form in which various means for solving the above problem are combined.

[0045]

[0046] As described above, according to the sealing device and sealing method of the pouch-type battery case of the present invention, the sealing portion of the pouch-type battery case is heated in a non-contact manner while the heat is concentrated and transferred to the center of a set area, so that product defects that may be caused by poor sealing of the sealing portion or sealing of a portion other than the sealing portion can be minimized.

[0047] In addition, according to the sealing device and sealing method of the pouch-type battery case of the present invention, since the outer shape of the cover constituting the heating member can be changed, various types of battery cases having different sealing portion locations or areas can also be used.

[0048]

[0049] Figure 1 is a front view illustrating the process of sealing a conventional pouch-type battery case.

[0050] FIG. 2 is a perspective view of a device for sealing a pouch-shaped battery case according to the first embodiment of the present invention.

[0051] Figure 3 is an enlarged cross-sectional view of a portion of Figure 2.

[0052] FIG. 4 is a perspective view of a device for sealing a pouch-shaped battery case according to a second embodiment of the present invention.

[0053] Figure 5 is an enlarged cross-sectional view of a portion of Figure 4.

[0054] FIG. 6 is a perspective view (a) and a front view (b) of a pouch-type battery case sealing device according to a second embodiment of the present invention.

[0055] Fig. 7 is a perspective view of a device for sealing a pouch-type battery case according to a third embodiment of the present invention.

[0056] Figure 8 is an enlarged cross-sectional view of a portion of Figure 7.

[0057]

[0058] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail, so that those skilled in the art can easily implement the present invention. When describing the operating principles of the embodiments of the present invention in detail, detailed descriptions of known functions or components will be omitted if they are deemed to unnecessarily obscure the gist of the present invention.

[0059] Parts with similar functions and actions are designated by the same drawing reference numerals throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only direct connections but also indirect connections with other elements intervening. Furthermore, inclusion of a component does not exclude other components unless otherwise specifically stated, but rather implies the inclusion of additional components.

[0060] The description that concretizes or adds to the components may be applied to all inventions unless there is a special limitation, and is not limited to the description of a specific invention.

[0061] Throughout the description and claims of the invention herein, the singular includes the plural unless otherwise stated.

[0062] Throughout the description and claims of the present invention, the term "or" includes "and" unless otherwise stated. Therefore, "comprising A or B" means all three cases of including A, including B, or including A and B.

[0063] The present invention is described in detail with examples according to the drawings.

[0064] FIG. 2 is a perspective view of a device for sealing a pouch-shaped battery case according to a first embodiment of the present invention, and FIG. 3 is an enlarged cross-sectional view of a portion of FIG. 2.

[0065] Referring to FIGS. 2 and 3, the pouch-type battery case sealing device according to the first embodiment is configured to include a support die (100), a heating member (200), and a temperature sensor (300).

[0066] First, the support die (100) is configured to support a battery cell, and the battery cell has an electrode assembly (20) built into a battery case (10) composed of a first case (11) and a second case (12), and the electrode assembly (20) includes a bidirectional electrode assembly in which a positive electrode lead (21) and a negative electrode lead (22) protrude in opposite directions. Alternatively, it may be a unidirectional electrode assembly in which a positive electrode lead (21) and a negative electrode lead (22) protrude in the same direction.

[0067] The pouch-type battery case (10) is composed of a laminate sheet including an outer resin layer that protects the battery cell from the outside, a metal layer for blocking air and moisture, and an inner resin layer for heat-sealing.

[0068] Here, the outer resin layer requires excellent tensile strength and weather resistance relative to its thickness, and may include, for example, one or more selected from the group consisting of stretched nylon, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), etc. The metal layer may use various metal materials that can function to prevent air, moisture, etc. from entering the inside of the battery, and may preferably be made of aluminum or an aluminum alloy. In addition, the inner resin layer serves to provide sealing properties by being heat-sealed to each other by heat and pressure applied while the electrode assembly is embedded, and may preferably include one or more selected from the group consisting of a polyolefin-based resin, CPP (non-stretched polypropylene), etc.

[0069] A lead film (23) is positioned on each of the upper, lower, and side surfaces of the positive lead (21) and the negative lead (22), and the positive lead (21) and the negative lead (22) with the lead film (23) attached thereto are placed between the first case (11) and the second case (12). A sealing portion (S) is formed at least in a portion of the outer periphery where the first case (11) and the second case (12) overlap, so that the battery case (10) in which the sealing portion (S) where the first case (11) and the second case (12) overlap is formed is mounted on the support die (100).

[0070] The heating member (200) is positioned above or below the sealing member (S) and heats the sealing member (S) to a certain temperature, thereby melting and thermally bonding the internal resin layers of the first case (11) and the second case (12). Here, it is preferable that the heating member (200) be a non-contact heating member (200) that does not directly contact the sealing member (S).

[0071] The heating member (200) may be positioned at the upper and lower portions of the sealing portion (S) as shown in the drawing, but this is merely an example, and may be positioned at either the upper or lower portion of the sealing portion (S) to transmit heat to the upper portion of the sealing portion (S) or the lower portion of the sealing portion (S) to seal the sealing portion (S).

[0072] More specifically, the heating member (200) includes a heater (210) having a certain length, and a cover (220) that surrounds the heater (210).

[0073] Here, the heater (210) may be a bar-shaped infrared heater, and the blocking metal layer is heated, and the heat conducted therefrom melts the inner resin layer, thereby forming a heat-sealed sealing portion. Of course, it is not limited to an infrared heater, and a halogen lamp may also be used.

[0074] The cover (220) may include a first cover (221) that covers the longitudinal (z) side of the heater (210), the widthwise (x) side, and the side opposite to the direction in which the sealing portion (S) is arranged, and a pair of second covers (222) that extend downward (y) a certain distance from the longitudinal (z) side of the first cover (221).

[0075] Here, the side opposite to the direction in which the sealing portion (S) of the first cover (221) is arranged may be the upper surface when the heating member (200) is positioned above the sealing portion (S), and may be the lower surface when the heating member (200) is positioned below the sealing portion (S).

[0076] The first cover (221) and the second cover (222) can prevent the heat transferred from the heater (210) from being dispersed to unnecessary parts, and in particular, the second cover (222) can be extended to be as close as possible to the sealing portion (S), thereby blocking the heat from being released outside the space formed between the pair of second covers (222).

[0077] The second cover (222) is a structure extending from the first cover (221), and the first cover (221) and the second cover (222) may be made of the same material or may be made of different materials.

[0078] For example, the first cover (221) and the second cover (222) may be made of a material selected from the group consisting of a glass insulating material, a mineral insulating material, a metallic insulating material, and a carbon insulating material.

[0079] The above glass-based insulation material includes glass wool, which is mainly made of glass-based minerals such as silica, limestone, feldspar, and soda ash. The mineral insulation material may include asbestos, rock wool, and perlite. In addition, the metallic insulation material includes siliceous, alumina, and magnesia materials, and the carbon-based insulation material may be manufactured by molding carbon fibers and carbon powder.

[0080] Meanwhile, the specifications of the battery cell may vary depending on the needs of the user, and as a result, the width direction (x) length of the sealing portion (S) may vary.

[0081] In this case, it is preferable that the second cover (222) be made of a material that can be deformed in an inward direction where the pair of second covers (222) come closer or in an outward direction where they move away from each other so that the second cover (222) can correspond to the width direction (x) of the sealing portion (S).

[0082] Since the first cover (221) and the second cover (222) above perform the function of gathering the heat generated from the heater (210) toward the sealing portion (S), it is preferable that a heat-reflective coating layer be additionally provided on the inner surface of the first cover (221) and the second cover (222). Examples of the heat-reflective coating layer include materials such as aluminum, silver, copper, and quartz, but there are no particular limitations as long as it can perform the same function.

[0083] In addition, it is desirable for the heater (210) to irradiate uniform heat to the entire sealing portion (S) so that the entire sealing portion (S) can be uniformly sealed, and it is desirable for the length of the heater (210) to be longer than the length of the sealing portion (S).

[0084] Continuing, the temperature sensor (300) is configured to measure the temperature of the sealing portion (S).

[0085] It is possible to perform the sealing operation by considering the heating conditions of the heating member (200), for example, the width of the sealing portion (S) that may vary depending on the battery cell specifications, the optimal heater (210) output, the distance between the heater (210) and the sealing portion (S), and the heating time. However, it is recommended to measure the temperature of the sealing portion (S) because there may be cases where the heater (210) does not operate properly.

[0086] In detail, the temperature sensor (300) is positioned on the inside of the cover (220) of the heating member (200) to measure whether the temperature of the sealing portion (S) has risen to a temperature required for thermal fusion, and is arranged toward the sealing portion (S) to measure the temperature of the sealing portion (S). For example, the temperature sensor (300) may be installed on the inside of the first cover (221), and may be arranged such that the temperature measuring portion (not shown) faces the sealing portion (S) to measure the temperature of the sealing portion (S). Here, the temperature sensor (300) may be a non-contact thermometer, for example, a non-contact infrared thermometer.

[0087] Although the drawing shows that there is only one temperature sensor (300), this is only an example, and multiple sensors may be provided so that the edges and the center of both sides of the sealing portion (S) can be measured simultaneously.

[0088]

[0089] FIG. 4 is a perspective view of a device for sealing a pouch-type battery case according to a second embodiment of the present invention, FIG. 5 is an enlarged cross-sectional view of a part of FIG. 4, and FIG. 6 is a perspective view (a) and a front view (b) of a pouch-type battery case sealing device according to a second embodiment of the present invention.

[0090] Referring to FIGS. 4 to 6, the pouch-type battery case sealing device according to the second embodiment is the same as the pouch-type battery case sealing device according to the first embodiment, except that the first cover (221) and the second cover (222) are connected by a rotating member (223).

[0091] Therefore, in the following, only the configurations different from the pouch-type battery case sealing device according to the first embodiment will be described.

[0092] The first cover (221) and the second cover (222) are connected to each other by a rotation member (223), so that the pair of second covers (222) can be deformed to incline inwardly toward each other or incline outwardly away from each other. Of course, it is self-evident that the second cover (222) should be able to remain in the deformed state if no external force is applied when it is deformed.

[0093] Here, the above-mentioned rotating member (223) may be a hinge axis, but is not limited thereto as long as the first cover (221) and the second cover (222) can rotate with each other.

[0094] As described above, when the first cover (221) and the second cover (222) are connected to each other by the rotating member (223), it is much easier to control the supply direction and arrival location of the heat generated from the heater (210). In addition, since the second cover (222) can be replaced with a second cover (222) of different heights, it is also possible to control the distance between the heater (210) and the sealing portion (S).

[0095] FIG. 7 is a perspective view of a device for sealing a pouch-shaped battery case according to a third embodiment of the present invention, and FIG. 8 is an enlarged cross-sectional view of a portion of FIG. 7.

[0096] Referring to FIGS. 7 and 8, the pouch-type battery case sealing device according to the third embodiment is identical to the pouch-type battery case sealing device according to the first embodiment except for the configuration of the cover (220).

[0097] Therefore, in the following, only the configurations different from the pouch-type battery case sealing device according to the first embodiment will be described.

[0098] When the heating member (200) is positioned above the sealing portion (S), the second cover (222) is positioned below the first cover (221), and at this time, it is preferable that the first cover (221) and the second cover (222) are separated so that the second cover (222) can move in the width direction of the first cover (221). When the heating member (200) is positioned below the sealing portion (S), the second cover (222) is positioned above the first cover (221), and can be provided in the same manner.

[0099] Below, the case where the heating member (200) is located above the sealing part (S) will be described, and the case where the heating member (200) is located below the sealing part (S) will be omitted.

[0100] In detail, the second cover (222) is a roughly square plate shape extending vertically downward from both sides of the longitudinal edge of the first cover (221), and a moving member (224) for moving the second cover (222), for example, a sub-motor, is connected to one side.

[0101] Accordingly, the gap between the pair of second covers (222) can be widened or narrowed by operating the transfer member (224) by the control signal.

[0102] In particular, when a first flange (221a) extending in the width direction of the first cover (221) is provided on one or both longitudinal edges of the first cover (221), or a second flange (222a) extending in the width direction of the first cover (221) is provided on one or both longitudinal upper edges of the second cover (222), or when the first flange (221a) and the second flange (222a) are provided at the same time, heat can be blocked from being released to the outside by the first flange (221a) and the second flange (222a).

[0103] Here, the first cover (221) may be a material selected from the group consisting of the aforementioned glass insulation material, mineral insulation material, metallic insulation material, and carbon insulation material.

[0104] According to the third embodiment of the present invention having the above configuration, since the position of the second cover (222) is adjusted using the transfer member (224), more precise position adjustment is possible, and as a result, only the set portion of the sealing portion can be heated.

[0105] The present invention provides a method for sealing a pouch-type battery case, and specifically, the method may include a first step of determining a position of a sealing portion (S) where the first case (11) and the second case (12) overlap each other, an electrode assembly (20) built into the battery case (10) composed of a first case (11) and a second case (12), a second step of controlling the output of a non-contact heating member (200) so that heat can reach at least one of a first surface and a second surface of the sealing portion (S), and a third step of measuring whether the sealing portion (S) has reached a set temperature.

[0106] Specifically, the first step is a step of arranging the first case (11) and the second case (12) so that the outer peripheries of the first case (11) and the second case (12) face each other, and determining the position and width of the sealing portion (S) to be formed in the first case (11) and the second case (12).

[0107] In the second step, the output of the non-contact heating element (200) can be adjusted so that heat can reach the first side and / or the second side of the sealing portion (S).

[0108] Additionally, in the second step, it is preferable to additionally perform a step of controlling the area where heat reaches the first side and / or the second side of the sealing portion (S). For example, by deforming or rotating a pair of second covers (222) constituting the heating member (200), or one second cover (222), it is possible to prevent unnecessary parts from being heated.

[0109] In the third step, the temperature of the first surface and / or the second surface of the sealing portion, to which the heat of the heating element (200) directly reaches, is measured.

[0110] That is, the temperature sensor (300) is placed inside the cover (220) of the heating member (200) that is placed above and / or below the sealing member (S), and the temperature of the sealing member (S) measured in the third step is the temperature of the first surface and / or the second surface to which the heat of the heating member (200) on which the temperature sensor (300) is placed reaches.

[0111] Meanwhile, it is preferable to secure in advance the heat fusion conditions of the sealing portion (S) prior to the first step, such as the output of the heater (210) constituting the heating member (200), the heating time, and the temperature of the first side and / or the second side of the sealing portion (S).

[0112]

[0113] Anyone with ordinary knowledge in the field to which the present invention pertains will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

[0114] (Explanation of symbols)

[0115] 10: Battery case

[0116] 11: Case 1 12: Case 2

[0117] 20: Electrode assembly

[0118] 21: Positive lead 22: Negative lead

[0119] 23: Lead film

[0120] 30: Sealing tool

[0121] 31: First sealing tool 31a: First depression

[0122] 32: Second sealing tool 32a: Second depression

[0123] 100: Support die

[0124] 110: Penetration

[0125] 200: Heating element

[0126] 210: Heater

[0127] 220: Cover

[0128] 221: First cover 221a: First flange

[0129] 222: Second cover 222a: Second flange

[0130] 223: Rotating member 224: Transfer member

[0131] 300: Temperature sensor

[0132] S: Sealing part

Claims

1. A sealing device for a pouch-type battery case, characterized in that an electrode assembly is built into a battery case composed of a first case and a second case, and a non-contact heating member is positioned above or below a sealing part where the first case and the second case overlap, and heats the sealing part to a certain temperature so that the sealing part can be thermally fused.

2. In paragraph 1, The above heating element includes a heater having a certain length and a cover covering the heater, A sealing device for a pouch-type battery case, characterized in that the cover includes a first cover that covers the longitudinal side of the heater, the widthwise side, and the side opposite to the direction in which the sealing portion is arranged, and a second cover that extends downward by a certain length from the longitudinal side of the first cover.

3. In paragraph 2, A sealing device for a pouch-type battery case, characterized in that the heating member is positioned above and below the sealing portion, respectively.

4. In paragraph 2, A sealing device for a pouch-type battery case, characterized in that the second cover is made of a material that can be deformed inward or outward.

5. In paragraph 2, A sealing device for a pouch-type battery case, characterized in that the first cover and the second cover are made of a material selected from the group consisting of a glass insulating material, a mineral insulating material, a metallic insulating material, and a carbon insulating material.

6. In paragraph 5, A sealing device for a pouch-type battery case, characterized in that the inner surfaces of the first cover and the second cover are provided with a heat-reflective coating layer.

7. In paragraph 2, A sealing device for a pouch-type battery case, characterized in that the first cover and the second cover are connected by a rotating member.

8. In paragraph 7, A sealing device for a pouch-type battery case, characterized in that the above-mentioned rotating member is a hinge axis.

9. In paragraph 2, A sealing device for a pouch-type battery case, characterized in that the second cover is separated from the first cover and is movable along the width direction of the first cover.

10. In paragraph 9, A sealing device for a pouch-shaped battery case, characterized in that a first flange extending in the width direction of the first cover is provided on the longitudinal edge of the first cover.

11. In paragraph 9, A sealing device for a pouch-shaped battery case, characterized in that a second flange extending in the width direction of the first cover is provided on the longitudinal upper edge of the second cover.

12. In paragraph 2, Further comprising a temperature sensor for measuring the temperature of the sealing portion; A sealing device for a pouch-type battery case, characterized in that the temperature sensor is positioned on the inside of the cover and is arranged so as to face the sealing portion.

13. A first step of determining the position of a sealing portion where the first case and the second case overlap, wherein an electrode assembly is built into a battery case composed of a first case and a second case; A second step of controlling the output of the non-contact heating element so that heat can reach at least one of the first and second surfaces of the sealing portion; and A method for sealing a pouch-type battery case, characterized in that it comprises a third step of measuring whether the sealing portion has reached a set temperature.

14. In paragraph 13, A method for sealing a pouch-shaped battery case, characterized in that it further includes a step of securing a set temperature of the third step prior to the first step.

15. In paragraph 14, A method for sealing a pouch-shaped battery case, characterized in that in the second step, the output of a non-contact heating element is adjusted so that heat can reach the first and second surfaces of the sealing portion.

16. In paragraph 14, A sealing method for a pouch-shaped battery case, characterized in that the second step further includes a step of controlling an area where heat reaches the first or second surface of the sealing portion.

17. In paragraph 16, A sealing method for a pouch-type battery case, characterized in that the temperature measured in the third step is the temperature of the first or second surface of the sealing portion to which the heat of the heating element directly reaches.

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