Sealing device and method for pouch-type battery case, and method for manufacturing pouch-type secondary battery using the same

Abstract

The present invention relates to a sealing device and a sealing method for a pouch-type battery case, and more particularly to a sealing device and a sealing method for a pouch-type battery case, in which an electrode assembly is built into a battery case consisting of a first case and a second case, and the sealing device and the sealing method include a non-contact heating member that is located above or below a sealing portion where the first case and the second case are overlapped, and that heats the sealing portion to a certain temperature so that the sealing portion is thermally sealed.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0085018 filed June 30, 2023, and Korean Patent Application No. 10-2024-0050041 filed April 15, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a sealing device and method for a pouch-type battery case, and more particularly to a sealing device and method for a pouch-type battery case including a support die and a non-contact heating member for heating the sealing portion of the pouch-type battery case. [Background technology]

[0003] As the need to provide solutions to environmental pollution problems becomes urgent, industrial interest in reducing greenhouse gas emissions is increasing. Therefore, much research is being conducted on lithium secondary batteries, a type of environmentally friendly energy, as an alternative to fossil fuels.

[0004] Depending on the type of exterior material, lithium secondary batteries are classified into pouch-type secondary batteries made of laminated sheets, cylindrical secondary batteries made of metal materials, and prismatic secondary batteries. Pouch-type secondary batteries have the advantages of being easily deformable, easy to manufacture, and low manufacturing costs.

[0005] A pouch-type secondary battery includes an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive and negative electrodes, housed inside a pouch-type battery case made of a laminate sheet. A positive electrode lead and a negative electrode lead are connected to the positive electrode tab and the negative electrode tab, respectively, and then extend to be exposed to the outside of the pouch-type battery case.

[0006] The pouch-type battery case is composed of a first case and a second case that house an electrode assembly inside. The first and second cases have 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.

[0007] The first case and the second case are arranged so that their respective internal resin layers face each other, and the positive electrode lead and the negative electrode lead are arranged so as to penetrate the outer peripheries of the first case and the second case, and the outer peripheries are heat-sealed to form a sealing portion.

[0008] In order to increase the sealing strength between the positive and negative electrode leads and the pouch-type battery case, lead films may be attached to the upper and lower surfaces of the positive and negative electrode leads, respectively.

[0009] FIG. 1 is a front view illustrating the sealing process of a conventional pouch-type battery case.

[0010] Referring to FIG. 1, the pouch-type battery cell houses an electrode assembly 20 inside a battery case 10, and the battery case 10 includes a first case 11 that houses the electrode assembly 20, and a second case 12 that is disposed on the upper surface of the first case 11 and is heat-sealed to the first case 11.

[0011] Here, the first case 11 and the second case 12 are made 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.

[0012] A positive electrode lead 21 connected to the positive electrode tab of the electrode assembly 20 penetrates the outer periphery of the battery case 10 and protrudes to the outside with lead films 23 attached to the upper and lower surfaces.

[0013] To form a sealing portion of the 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 with 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 melt and are thermally fused together to form a sealing portion.

[0014] Here, in order to prevent a decrease in the sealing strength around the outer periphery of the battery case 10 due to a difference in thickness between the positive electrode lead 21 and the lead film 23, a first recess 31a may be formed in the first sealing tool 31 and a second recess 32a may be formed in the second sealing tool 32 to correspond to the thicknesses of the positive electrode lead 21 and the lead film 23.

[0015] 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 tightly attached to each other, resulting in a gap, which may allow the electrolyte to leak through the gap.

[0016] Furthermore, if foreign matter is burned onto the sealing tool 30, not only may the battery case be damaged by the foreign matter during the pressing process, but deviations in sealing temperature may also occur in the area of ​​the pressing surface of the sealing tool 30 where the foreign matter is attached.

[0017] In order to prevent the problems that arise when using a contact sealing tool that directly presses the battery case, Patent Document 1 discloses a process of forming a sealing portion by irradiating infrared rays onto the outer surface of the electrode assembly housing portion, which is the area to be sealed.

[0018] Patent Document 1 heats the area to be sealed in a non-contact manner, thereby preventing poor sealing due to the difference in the thickness of the electrode lead and the step of the sealing tool. However, it has a new problem in that it is difficult to adjust the heating area, and heat may be applied to areas other than the area to be sealed. [Prior art documents] [Patent documents]

[0019] [Patent Document 1] Korean Patent Registration No. 10-1216423 Summary of the Invention [Problem to be solved by the invention]

[0020] The present invention has been made to solve the above problems, and aims to provide a sealing device and sealing method for a pouch-type battery case that can selectively heat the sealing portion of the pouch-type battery case to seal it in a contactless manner.

[0021] Another object of the present invention is to provide a sealing device and method for a pouch-type battery case that can easily adjust the heating position and heating area to accommodate changes in the width of the sealing part of the pouch-type battery case. [Means for solving the problem]

[0022] To achieve this object, the pouch-type battery case sealing device of the present invention includes a battery case (10) consisting of a first case (11) and a second case (12) with an electrode assembly (20) built in, and a non-contact heating member (200) located above or below the sealing portion (S) where the first case (11) and the second case (12) overlap, for heating the sealing portion (S) to a certain temperature so that the sealing portion (S) is thermally sealed.

[0023] The heating member (200) includes a heater (210) having a certain length and a cover (220) surrounding the heater (210), and the cover (220) may include a first cover (221) surrounding the longitudinal side, width side, and side opposite to the direction in which the sealing portion S is arranged of the heater (210), and a second cover (222) extending downward by a certain length from the longitudinal side of the first cover (221).

[0024] The heating members (200) may be located above and below the sealing portion (S).

[0025] The second cover (222) may be made of a material that can be deformed inward or outward.

[0026] The first cover 221 and the second cover 222 may be made of a material selected from the group consisting of a vitreous insulating material, a mineral insulating material, a metallic insulating material, and a carbonaceous insulating material.

[0027] The first cover (221) and the second cover (222) may have a heat-reflecting coating layer on their inner surfaces.

[0028] The first cover (221) and the second cover (222) may be connected via a rotating member (223).

[0029] The pivot member may be a hinge shaft.

[0030] The second cover (222) can be separated from the first cover (221) and moved along the width direction of the first cover (221).

[0031] The first cover (221) may include a first flange (221a) extending in the width direction of the first cover (221) at an edge in the longitudinal direction.

[0032] The second cover (222) may include a second flange (222a) at its upper longitudinal edge, extending in the width direction of the first cover (221).

[0033] The sealing device for the pouch-type battery case may further include a temperature sensor (300) for measuring the temperature of the sealing portion (S), and the temperature sensor (300) may be located inside the cover (220) and facing the sealing portion (S).

[0034] The method for sealing a pouch-type battery case according to the present invention includes a first step of incorporating an electrode assembly (20) into a battery case (10) consisting of a first case (11) and a second case (12) and determining the position of a sealing portion (S) where the first case (11) and the second case (12) overlap; a second step of adjusting the output of a non-contact heating member (200) so that heat reaches at least one of the first and second sides of the sealing portion (S); and a third step of measuring whether the sealing portion (S) has reached a set temperature.

[0035] The method may further include a step of ensuring a set temperature of the third step prior to the first step.

[0036] In the second step, the output of the non-contact heating member (200) can be adjusted so that heat reaches the first and second surfaces of the sealing portion (S).

[0037] The second step may further include adjusting an area of ​​the first surface or the second surface that heat reaches.

[0038] The temperature measured in the third step may be the temperature of the first or second surface of the sealing part, to which the heat of the heating member directly reaches.

[0039] Furthermore, the present invention can also be provided in the form of various combinations of means for solving the above problems. [Effects of the Invention]

[0040] As described above, according to the sealing device and sealing method for a pouch-type battery case of the present invention, the sealing portion of the pouch-type battery case is heated in a non-contact manner, and heat is transferred in a concentrated manner centered on a set area, thereby minimizing product defects that may occur due to poor sealing of the sealing portion or sealing of areas other than the sealing portion.

[0041] In addition, according to the sealing device and sealing method for a pouch-type battery case of the present invention, the outer shape of the cover that constitutes the heating member can be deformed, so that various types of battery cases with different sealing portion positions and areas can be used. [Brief explanation of the drawings]

[0042] [Figure 1] 1 is a front view illustrating a sealing process for a conventional pouch-type battery case.

[0043] [Figure 2] 1 is a perspective view of a device for sealing a pouch-type battery case according to a first embodiment of the present invention;

[0044] [Figure 3] FIG. 3 is an enlarged cross-sectional view of a part of FIG. 2.

[0045] [Figure 4] FIG. 10 is a perspective view of a device for sealing a pouch-type battery case according to a second embodiment of the present invention.

[0046] [Figure 5] FIG. 5 is an enlarged cross-sectional view of a part of FIG.

[0047] [Figure 6] 10A and 10B are a perspective view and a front view, respectively, of a pouch-type battery case sealing device according to a second embodiment of the present invention.

[0048] [Figure 7] FIG. 10 is a perspective view of a device for sealing a pouch-type battery case according to a third embodiment of the present invention.

[0049] [Figure 8] FIG. 8 is an enlarged cross-sectional view of a part of FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0050] Hereinafter, with reference to the accompanying drawings, a detailed description will be given of an embodiment of the present invention that will enable a person skilled in the art to easily carry out the present invention. However, in describing the operation principle of the preferred embodiment of the present invention in detail, detailed description of related well-known functions or configurations will be omitted if it is determined that such detailed description may unnecessarily obscure the gist of the present invention.

[0051] Throughout the drawings, the same reference numerals are used for parts having similar functions and actions. Throughout the specification, when a part is said to be connected to another part, this includes not only a direct connection but also an indirect connection via another element therebetween. Furthermore, unless otherwise specified, "including a certain element" does not mean that other elements are excluded, but that other elements may also be included.

[0052] Descriptions that limit or further embody elements are applicable to all inventions unless otherwise limited, and are not limited to descriptions of particular inventions.

[0053] Furthermore, throughout the description of the present invention and the claims, the singular includes the plural unless otherwise stated.

[0054] Throughout the description and claims, "or" includes "and" unless otherwise stated. Thus, "comprising A or B" means the three cases of including A, including B, or including both A and B.

[0055] The invention will now be explained with reference to the drawings and in conjunction with detailed embodiments.

[0056] FIG. 2 is a perspective view of a pouch-type battery case sealing device according to a first embodiment of the present invention, and FIG. 3 is an enlarged cross-sectional view of a portion of FIG.

[0057] Referring to FIGS. 2 and 3, the pouch-type battery case sealing device according to the first embodiment includes a support die 100, a heating member 200, and a temperature sensor 300.

[0058] First, the support die 100 is configured to support a battery cell, and the battery cell has an electrode assembly 20 housed in a battery case 10 composed of a first case 11 and a second case 12. 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, the electrode assembly may be a unidirectional electrode assembly in which the positive electrode lead 21 and the negative electrode lead 22 protrude in the same direction.

[0059] The pouch-type battery case 10 is made 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.

[0060] The outer resin layer is required to have excellent tensile strength and weather resistance relative to its thickness, and may be made of, for example, one or more materials selected from the group consisting of oriented nylon, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), etc. The metal layer may be made of various metal materials capable of preventing air, moisture, etc. from entering the battery, and may be made of aluminum or an aluminum alloy. The inner resin layer provides a hermetic seal by being thermally sealed together with the electrode assembly when heat and pressure are applied, and may be made of, for example, one or more materials selected from the group consisting of polyolefin resin, CPP (non-oriented polypropylene), etc.

[0061] Lead films 23 are positioned on the upper, lower, and side surfaces of the positive electrode lead 21 and the negative electrode lead 22, respectively, and the positive electrode lead 21 and the negative electrode lead 22 with the lead films 23 attached are disposed between the first case 11 and the second case 12. A sealing portion S is formed at least on a portion of the outer periphery where the first case 11 and the second case 12 overlap, and the battery case 10 with the sealing portion S formed where the first case 11 and the second case 12 overlap is placed on the support die 100.

[0062] The heating member 200 is located above or below the sealing portion S and heats the sealing portion S to a certain temperature, thereby melting and thermally sealing the internal resin layers of the first case 11 and the second case 12. Here, it is preferable that the heating member 200 is a non-contact type heating member 200 that does not come into direct contact with the sealing portion S.

[0063] As shown in the drawing, the heating member 200 may be located on both the upper and lower sides of the sealing portion S, but this is only an example, and the heating member 200 may be located on either the upper or lower side of the sealing portion S and transfer heat to the upper or lower side of the sealing portion S to seal the sealing portion S.

[0064] To explain the heating member 200 in more detail, the heating member 200 includes a heater 210 having a certain length and a cover 220 surrounding the heater 210 .

[0065] Here, the heater 210 may be a bar-shaped infrared heater that heats the insulating metal layer and melts the inner resin layer with the heat conducted from the heater, thereby forming a heat-sealed seal. Of course, the heater is not limited to an infrared heater, and a halogen lamp may also be used.

[0066] The cover 220 may include a first cover 221 that surrounds the longitudinal (z) side, width (x) side, and side opposite to the direction in which the sealing portion S is arranged of the heater 210, and a pair of second covers 222 that extend downward (y) for a certain length from the longitudinal (z) side of the first cover 221.

[0067] Here, the side of the first cover 221 opposite to the direction in which the sealing portion S is arranged may be the upper surface when the heating member 200 is located above the sealing portion S, or the lower surface when the heating member 200 is located below the sealing portion S.

[0068] 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 prevent the heat from being released to the outside of the space formed between the pair of second covers 222 by extending as close as possible to the sealing part S.

[0069] The second cover 222 is a structure extending from the first cover 221, and the first cover 221 and the second cover 222 can be made of the same material or different materials.

[0070] For example, the first cover 221 and the second cover 222 may be made of a material selected from the group consisting of a vitreous insulating material, a mineral insulating material, a metallic insulating material, and a carbonaceous insulating material.

[0071] The vitreous insulating material includes glass wool, which is made primarily from glass-based minerals such as quartz sand, limestone, feldspar, and soda ash, while the mineral insulating material includes asbestos, rock wool, and perlite. Metallic insulating materials include silicate, alumina, and magnesia, while carbonaceous insulating materials can be manufactured by molding carbonaceous fibers and carbon powder.

[0072] Meanwhile, the specifications of the battery cells may change depending on the demands of the consumers, and as a result, the length of the sealing portion S in the width direction (x) may vary.

[0073] In this case, it is preferable that the second cover 222 is made of a material that can deform inward so that the pair of second covers 222 move closer to each other or outward so that they move away from each other, corresponding to the length of the width direction (x) of the sealing portion S.

[0074] Since the first cover 221 and the second cover 222 function to collect the heat generated from the heater 210 toward the sealing portion S, it is preferable that a heat reflective coating layer is further provided on the inner surface of the first cover 221 and the second cover 222. Examples of the heat reflective coating layer include aluminum, silver, copper, and quartz, but are not particularly limited as long as it can perform the same function.

[0075] In addition, since it is preferable that the heater 210 irradiates uniform heat to the entire sealing portion S so that the entire sealing portion S can be sealed uniformly, it is preferable that the length of the heater 210 is equal to or greater than the length of the sealing portion S.

[0076] Next, the temperature sensor 300 is configured to measure the temperature of the sealing portion S.

[0077] The sealing operation can be performed by taking into consideration the heating conditions of the heating member 200, for example, the width of the sealing portion S, which may vary depending on the battery cell specifications, and by determining the optimal heater 210 output, the distance between the heater 210 and the sealing portion S, and the heating time. However, since there may be cases where the heater 210 does not operate normally, it is advisable to measure the temperature of the sealing portion S.

[0078] In detail, the temperature sensor 300 is for measuring whether the temperature of the sealing portion S has risen to a temperature required for thermal sealing, and is located inside the cover 220 of the heating member 200, facing the sealing portion S, to measure the temperature of the sealing portion S. For example, the temperature sensor 300 may be installed inside the first cover 221, and be arranged such that a temperature measuring unit (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.

[0079] For example, although the drawing shows one temperature sensor 300, this is merely an example, and multiple temperature sensors may be provided so as to measure both side edges and the center of the sealing portion S simultaneously.

[0080] FIG. 4 is a perspective view of a pouch-type battery case sealing device according to a second embodiment of the present invention, FIG. 5 is an enlarged cross-sectional view of a portion of FIG. 4, and FIG. 6 is a perspective view (a) and a front view (b) of the pouch-type battery case sealing device according to the second embodiment of the present invention.

[0081] Referring to Figures 4 to 6, the pouch-type battery case sealing device according to the second embodiment is similar to 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 via a rotating member 223.

[0082] Therefore, only the configurations that are different from the pouch-type battery case sealing device according to the first embodiment will be described below.

[0083] The first cover 221 and the second cover 222 are connected to each other via the pivot member 223, so that the pair of second covers 222 can be deformed to tilt inward toward each other or outward away from each other. Of course, once the second cover 222 is deformed, it is clear that it should maintain the deformed state unless an external force is applied.

[0084] Here, the rotating member 223 may be a hinge shaft, but is not limited thereto as long as the first cover 221 and the second cover 222 can rotate relative to each other.

[0085] When the first cover 221 and the second cover 222 are connected to each other by the rotating member 223 as described above, it is easier to adjust the supply direction and arrival position of the heat generated from the heater 210. Furthermore, since the second cover 222 can be replaced with one having a different height, the distance between the heater 210 and the sealing part S can also be adjusted.

[0086] FIG. 7 is a perspective view of a pouch-type battery case sealing device according to a third embodiment of the present invention, and FIG. 8 is an enlarged cross-sectional view of a portion of FIG.

[0087] Referring to Figures 7 and 8, the pouch-type battery case sealing device according to the third embodiment is similar to the pouch-type battery case sealing device according to the first embodiment except for the configuration of the cover 220.

[0088] Therefore, only the configurations that are different from the pouch-type battery case sealing device according to the first embodiment will be described below.

[0089] When the heating member 200 is located above the sealing portion S, the second cover 222 is located below the first cover 221. Here, 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 located below the sealing portion S, the second cover 222 is located above the first cover 221, and they can be configured in the same manner.

[0090] In the following, a case where the heating member 200 is positioned above the sealing portion S will be described, and a case where the heating member 200 is positioned below the sealing portion S will be omitted.

[0091] In detail, the second cover 222 has the shape of a roughly rectangular plate extending vertically downward from both longitudinal edges of the first cover 221, and one side is connected to a transport member 224, such as a sub-motor, for moving the second cover 222.

[0092] Therefore, the distance between the pair of second covers 222 can be increased or decreased by operating the transfer member 224 in response to the control signal.

[0093] In particular, when a first flange 221a extending in the width direction of the first cover 221 is provided at one or both longitudinal edge ends of the first cover 221, or a second flange 222a extending in the width direction of the first cover 221 is provided at one or both longitudinal edge ends of the second cover 222, or when both the first flange 221a and the second flange 222a are provided, these first flange 221a and second flange 222a can prevent heat from being released to the outside.

[0094] Here, the first cover 221 may be made of a material selected from the group consisting of the above-mentioned vitreous insulating material, mineral insulating material, metallic insulating material, and carbonaceous insulating material.

[0095] According to the third embodiment of the present invention having the above-mentioned configuration, the position of the second cover 222 is adjusted using the transfer member 224, which allows for more precise position adjustment, and as a result, only the designated area of ​​the sealing portion can be heated.

[0096] The present invention provides a sealing method for a pouch-type battery case. Specifically, the method includes a first step of incorporating an electrode assembly 20 into a battery case 10 consisting of a first case 11 and a second case 12, and determining the position of a sealing portion S where the first case 11 and the second case 12 overlap, a second step of adjusting the output of a non-contact heating member 200 so that heat reaches at least one of the first and second surfaces of the sealing portion S, and a third step of measuring whether the sealing portion S has reached a set temperature.

[0097] Specifically, the first step is to arrange the first case 11 and the second case 12 so that the outer periphery of the first case 11 faces the outer periphery of the second case 12, and to determine the position and width of the sealing portion S to be formed in the first case 11 and the second case 12.

[0098] In the second step, the output of the non-contact heating member 200 can be adjusted so that heat can reach the first surface and / or the second surface of the sealing portion S.

[0099] In addition, it is preferable to further perform a step of adjusting the area where heat reaches the first and / or second surfaces of the sealing part S in the second step. For example, by deforming or rotating a pair of second covers 222 or one second cover 222 constituting the heating member 200, it is possible to prevent unnecessary areas from being heated.

[0100] In the third step, the temperature of the first surface and / or the second surface of the sealing part, to which the heat of the heating member 200 directly reaches, is measured.

[0101] That is, the temperature sensor 300 is disposed inside the cover 220 of the heating member 200 disposed above and / or below the sealing part S. The temperature of the sealing part S measured in the third step is the temperature of the first surface and / or second surface to which the heat of the heating member 200 where the temperature sensor 300 is disposed reaches.

[0102] Meanwhile, prior to the first step, it is preferable to determine in advance the heat sealing conditions of the sealing portion S, such as the output of the heater 210 constituting the heating member 200, the heating time, and the temperature of the first and / or second surfaces of the sealing portion S.

[0103] Those skilled in the art will be able to make various applications and modifications within the scope of the present invention based on the above content. [Explanation of symbols]

[0104] 10 Battery case

[0105] 11 Case 1 12 Case 2

[0106] 20 Electrode assembly

[0107] 21 Positive lead 22 Negative lead

[0108] 23 Lead Film

[0109] 30 Sealing Tools

[0110] 31 First sealing tool 31a First depression

[0111] 32 Second sealing tool 32a Second depression

[0112] 100 Support Die

[0113] 110 Through hole

[0114] 200 Heating materials

[0115] 210 Heater

[0116] 220 Cover

[0117] 221 First Cover 221a First flange

[0118] 222 Second Cover 222a Second flange

[0119] 223 Rotating member 224 Transfer member

[0120] 300 Temperature Sensor

[0121] S sealing part

Claims

1. A pouch-type battery case sealing device, comprising: a battery case including a first case and a second case, an electrode assembly built therein; and a non-contact heating member located above or below a sealing portion where the first case and the second case are overlapped, for heating the sealing portion to a predetermined temperature so that the sealing portion is thermally sealed.

2. The heating member includes a heater having a certain length and a cover surrounding the heater, 2. The pouch-type battery case sealing device according to claim 1, wherein the cover includes a first cover that surrounds the longitudinal side, the width side, and the side opposite to the direction in which the sealing portion is disposed of the heater, and a second cover that extends downward a certain length from the longitudinal side of the first cover.

3. The pouch-type battery case sealing device according to claim 2 , wherein the heating members are respectively located above and below the sealing portion.

4. The pouch-type battery case sealing device according to claim 2 , wherein the second cover is made of a material that can be deformed inward or outward.

5. 3. The pouch-type battery case sealing device according to claim 2, wherein the first cover and the second cover are made of a material selected from the group consisting of a vitreous insulating material, a mineral insulating material, a metallic insulating material, and a carbonaceous insulating material.

6. The pouch-type battery case sealing device according to claim 5 , wherein the first cover and the second cover have an inner surface provided with a heat-reflecting coating layer.

7. The pouch-type battery case sealing device according to claim 2 , wherein the first cover and the second cover are connected via a rotating member.

8. 8. The pouch-type battery case sealing device according to claim 7, wherein the rotating member is a hinge shaft.

9. The sealing device for a pouch-type battery case according to claim 2 , wherein the second cover is separated from the first cover and can move along a width direction of the first cover.

10. 10. The pouch-type battery case sealing device according to claim 9, wherein a first flange is provided at a longitudinal edge of the first cover and extends in a width direction of the first cover.

11. 10. The pouch-type battery case sealing device according to claim 9, wherein the second cover is provided at an upper edge in the longitudinal direction with a second flange extending in the width direction of the first cover.

12. Further comprising a temperature sensor for measuring the temperature of the sealing portion; The pouch-type battery case sealing device according to claim 2 , wherein the temperature sensor is located inside the cover and faces the sealing portion.

13. a first step of incorporating an electrode assembly into a battery case including a first case and a second case, and determining a position of a sealing portion where the first case and the second case overlap; a second step of adjusting the output of the non-contact heating member so that heat reaches at least one of the first and second surfaces of the sealing portion; a third step of measuring whether the sealing part has reached a set temperature.

14. The method of claim 13 , further comprising the step of ensuring a set temperature for the third step prior to the first step.

15. The method of claim 14, wherein in the second step, an output of a non-contact heating member is adjusted so that heat reaches the first and second surfaces of the sealing portion.

16. The method of claim 14 , wherein the second step further comprises adjusting an area of ​​the first surface or the second surface of the sealing part that is exposed to heat.

17. 17. The method of claim 16, wherein the temperature measured in the third step is the temperature of the first or second surface of the sealing part that is directly exposed to heat from a heating member.

Images