Apparatus for sealing pouch battery cell with easy position alignment and method for sealing pouch battery cell using same

Abstract

The present invention relates to an apparatus for sealing a pouch battery cell with easy position alignment and a method for sealing a pouch battery cell using same and, more specifically, to an apparatus for sealing a pouch battery cell with easy position alignment and a method for sealing a pouch battery cell using same, the apparatus comprising: a seating jig on which a pouch battery cell is seated, the pouch battery cell being provided with an insulating film and an electrode lead positioned at a sealing part of a pouch case; a punch unit for forming guide holes in each of the sealing part, the electrode lead, and the insulating film; and a pair of sealing tools for sealing the sealing part, wherein the sealing tools have guide protrusions formed on surfaces facing the sealing part.

Description

Easy-to-align pouch battery cell sealing device and pouch battery cell sealing method using the same

[0001] This application claims the benefit of priority to Korean Patent Application No. 2024-0044455, filed April 2, 2024, and Korean Patent Application No. 2024-0143639, filed October 21, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a pouch battery cell sealing device with easy alignment and a pouch battery cell sealing method using the same, and more particularly, to a pouch battery cell sealing device with easy alignment and a pouch battery cell sealing method using the same, which can prevent occurrence of sealing position defects such as displacement of electrode leads and insulating films located in a sealing portion of a pouch battery cell from the correct position during sealing.

[0003] Recently, due to the development of alternative energy sources to address air pollution and energy depletion caused by the use of fossil fuels, demand for secondary batteries that can store generated electric energy is increasing.

[0004] Secondary batteries, the energy source for various electronic devices indispensable in modern society, are seeing increased capacity requirements due to the increasing use and complexity of mobile devices and the development of electric vehicles. To meet user demand, small devices are equipped with multiple battery cells. However, automobiles and other devices utilize battery modules, which electrically connect multiple battery cells, or battery packs comprising multiple such modules.

[0005] Meanwhile, in the pouch battery cell manufacturing process, the electrode assembly is housed in a pouch case, an electrolyte is injected, and the edge of the pouch case is heated and pressurized to form a sealing portion. At this time, the sealing portion may include an electrode lead, one end of which is connected to the electrode tab of the electrode assembly and the other end of which protrudes outward from the pouch case, and an insulating film positioned between the sealing portion and the electrode lead.

[0006] Fig. 1 is a side view showing a battery case sealing device according to the prior art. As shown in Fig. 1, the battery case sealing device (10) according to the prior art is configured to include a primary sealing unit (11) that seals by applying pressure and temperature, a secondary sealing unit (12), and a transport unit (13) that transports the battery case.

[0007] These primary sealing units (11) and secondary sealing units (12) apply pressure and temperature to the edge of the battery case being transported by the transport unit (13) to seal and form a sealing portion.

[0008] At this time, the sealing portion may have an electrode lead that can electrically connect the electrode assembly and an external device, and an insulating film to maintain an insulating state between the battery case and the electrode lead.

[0009] These electrode leads and insulating films may be in the correct position when placed in the sealing section, but there is a problem in that their position may be displaced during the sealing process, which may result in poor sealing position.

[0010] (Prior art literature)

[0011] (Patent Document 1) Korean Patent Publication No. 2023-0094176

[0012] In order to solve the above problems, the present invention provides a pouch battery cell sealing device and a pouch battery cell sealing method using the same, which can prevent occurrence of sealing position errors by aligning the positions of electrode leads and insulating films located in a sealing portion when sealing a pouch case and simultaneously performing sealing while being fixed in the aligned positions.

[0013] In order to achieve the above purpose, a pouch battery cell sealing device according to the present invention comprises a mounting jig (100) on which a pouch battery cell (C) having an electrode lead and an insulating film positioned in a sealing portion of a pouch case is mounted, a punch portion (200) forming a guide hole (H) in each of the sealing portion, the electrode lead, and the insulating film, and a pair of sealing tools (300) for sealing the sealing portion, wherein the sealing tool (300) is characterized in that a guide protrusion (310) is formed on a surface facing the sealing portion.

[0014] In addition, in the pouch battery cell sealing device according to the present invention, the punch part (200) is characterized in that it forms two or more guide holes (H).

[0015] In addition, in the pouch battery cell sealing device according to the present invention, the guide holes (H) formed in each of the sealing portion, the electrode lead, and the insulating film are characterized in that they are formed at the same position along a vertical extension line.

[0016] In addition, in the pouch battery cell sealing device according to the present invention, the guide protrusion (310) is characterized in that it is formed at a position corresponding to the guide hole (H).

[0017] In addition, in the pouch battery cell sealing device according to the present invention, the guide protrusions (310) are characterized in that the same number as the guide holes (H) is formed.

[0018] In addition, in the pouch battery cell sealing device according to the present invention, the guide protrusion (310) is characterized in that the horizontal cross-sectional shape is the same shape as the guide hole (H).

[0019] In addition, in the pouch battery cell sealing device according to the present invention, the guide protrusion (310) is characterized in that its unit area decreases as it gets closer to the guide hole (H).

[0020] In addition, in the pouch battery cell sealing device according to the present invention, the sealing tool (300) is characterized in that a receiving portion (320) capable of receiving the guide protrusion (310) is formed, and an elastic member (330) having elasticity is provided in the receiving portion (320).

[0021] In addition, in the pouch battery cell sealing device according to the present invention, the elastic member (330) is characterized in that it is a spring.

[0022] In addition, in the pouch battery cell sealing device according to the present invention, the height of the guide protrusion (310) is characterized in that it is at least half the height of the sum of the heights of the guide holes (H) formed in each of the sealing portion, the electrode lead, and the insulating film.

[0023] In addition, a pouch battery cell sealing method according to the present invention includes a step of forming a guide hole in each of a sealing portion, an electrode lead, and an insulating film of a pouch battery cell, and a step of sealing the sealing portion using a pair of sealing tools, wherein in the step of sealing the sealing portion using the pair of sealing tools, a guide protrusion formed on the sealing tool is inserted into the guide hole.

[0024] In addition, in the pouch battery cell sealing method according to the present invention, it is characterized in that, prior to the step of sealing the sealing part using the pair of sealing tools, the position of the sealing tool is adjusted so that the guide protrusion is at the same position along the vertical extension line as the guide hole.

[0025] In addition, a pouch battery cell according to the present invention includes an electrode assembly, a pouch case that accommodates the electrode assembly and has a sealing portion extending a certain length from an edge, an electrode lead having one side connected to an electrode tab of the electrode assembly and the other side protruding outward from the pouch case, and an insulating film provided between the sealing portion and the electrode lead, characterized in that a guide hole (H) is formed in each of the sealing portion, the electrode lead, and the insulating film.

[0026] In addition, in the pouch battery cell according to the present invention, the guide holes (H) formed in each of the sealing portion, the electrode lead, and the insulating film are characterized in that they are formed at the same position along a vertical extension line.

[0027] In addition, in the pouch battery cell according to the present invention, it is characterized in that two or more guide holes (H) are formed.

[0028] As described above, the pouch battery cell sealing device and pouch battery cell sealing method using the same, which are easy to align according to the present invention, have an advantage in that a guide protrusion is formed on the sealing tool, and when the sealing part is pressed against the sealing part, the guide protrusion is inserted into a guide hole formed in the sealing part, so that the positions of the sealing part, the electrode lead, and the insulating film are aligned in the correct positions.

[0029] In addition, according to the pouch battery cell sealing device and pouch battery cell sealing method using the same according to the present invention, there is an advantage in that the guide protrusion can be prevented from being damaged due to close contact between the sealing tools, since an elastic member connected to the guide protrusion is provided.

[0030] Fig. 1 is a side view showing a battery case sealing device according to the prior art.

[0031] Fig. 2 is a perspective view showing a pouch battery cell sealing device according to a preferred first embodiment of the present invention.

[0032] FIG. 3 is a perspective view showing a part of a sealing tool in a pouch battery cell sealing device according to a preferred first embodiment of the present invention.

[0033] Fig. 4 is a cross-sectional view showing a sealing tool in a pouch battery cell sealing device according to a preferred first embodiment of the present invention.

[0034] Fig. 5 is a cross-sectional view showing a sealing tool in a pouch battery cell sealing device according to a second preferred embodiment of the present invention.

[0035] 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. However, when describing the operating principles of preferred embodiments of the present invention in detail, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the gist of the present invention, such detailed descriptions will be omitted.

[0036] Additionally, the same drawing reference numerals are used for parts with similar functions and actions 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 specifically stated otherwise, but rather implies the inclusion of additional components.

[0037] Hereinafter, a pouch battery cell sealing device with easy position alignment according to the present invention and a pouch battery cell sealing method using the same will be described with reference to the attached drawings.

[0038] FIG. 2 is a perspective view showing a pouch battery cell sealing device according to a preferred first embodiment of the present invention, FIG. 3 is a perspective view showing a part of a sealing tool in a pouch battery cell sealing device according to a preferred first embodiment of the present invention, and FIG. 4 is a cross-sectional view showing a sealing tool in a pouch battery cell sealing device according to a preferred first embodiment of the present invention.

[0039] Referring to FIGS. 2 to 4, a pouch battery cell sealing device according to a preferred first embodiment of the present invention is configured to include a mounting jig (100), a punch portion (200), and a sealing tool (300).

[0040] First, the fixing jig (100) is for fixing a pouch battery cell (C) for sealing, and may be a worktable with a flat upper surface. As long as it can support the fixed pouch battery cell (C) and perform the sealing process, there are no particular limitations.

[0041] Here, the pouch battery cell (C) is configured to include an electrode assembly, a pouch case for storing the electrode assembly, an electrode lead having one side connected to the electrode tab of the electrode assembly and the other side protruding outside the pouch case, and an insulating film positioned between the sealing portion of the pouch case and the electrode lead.

[0042] The electrode assembly is a structure in which positive and negative electrodes are alternately laminated multiple times with a separator in between, and a pair of electrode leads consisting of a positive lead and a negative lead are electrically connected to the positive tab and the negative tab and then exposed to the outside of the pouch case.

[0043] The positive electrode is manufactured by applying a positive electrode mixture containing a positive electrode active material onto a positive electrode current collector and then drying the mixture. The positive electrode mixture may optionally further include a binder, a conductive agent, a filler, etc., as needed.

[0044] The positive electrode current collector can generally have a thickness of 3 to 500 ㎛. The positive electrode current collector is not particularly limited as long as it has high conductivity and does not cause chemical changes in the battery. For example, stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel surface-treated with carbon, nickel, titanium, silver, etc. can be used. In addition, the positive electrode current collector can form fine unevenness on the surface to increase the adhesiveness of the positive electrode active material, and various forms such as a film, sheet, foil, net, porous body, foam, or non-woven fabric can be used.

[0045] The cathode active material may be a layered compound such as lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), or a compound substituted with one or more transition metals; chemical formula Li. 1+x Mn 2-x Lithium manganese oxides such as O4 (where x is 0 to 0.33), LiMnO3, LiMn2O3, LiMnO2; lithium copper oxide (Li2CuO2); vanadium oxides such as LiV3O8, V2O5, Cu2V2O7; chemical formula LiNi 1-x M x Ni-site type lithium nickel oxide represented by O2 (where M = Co, Mn, Al, Cu, Fe, Mg, B or Ga and x = 0.01 to 0.3); chemical formula LiMn 2-x M x Lithium manganese composite oxides represented by O2 (wherein, M = Co, Ni, Fe, Cr, Zn or Ta, and x = 0.01 to 0.1) or Li2Mn3MO8 (wherein, M = Fe, Co, Ni, Cu or Zn); LiMn2O4 in which a portion of the Li in the chemical formula is replaced by an alkaline earth metal ion; disulfide compounds; Fe2(MoO4)3, etc., but are not limited thereto.

[0046] The negative electrode is manufactured by applying a negative electrode mixture containing a negative electrode active material onto a negative electrode current collector and then drying the mixture. The negative electrode mixture may include components such as a conductive agent, a binder, and a filler, as needed.

[0047] The negative electrode current collector is generally made with a thickness of 3 to 500 ㎛. The negative electrode current collector is not particularly limited as long as it has high conductivity and does not cause chemical changes in the battery. For example, copper, stainless steel, aluminum, nickel, titanium, calcined carbon, copper or stainless steel surface-treated with carbon, nickel, titanium, silver, etc., aluminum-cadmium alloy, etc. can be used. In addition, like the positive electrode current collector, the bonding strength of the negative electrode active material can be strengthened by forming fine unevenness on the surface, and it can be used in various forms such as a film, sheet, foil, net, porous body, foam, non-woven fabric, etc.

[0048] The separator prevents short circuits between the aforementioned negative and positive electrodes and allows only the movement of lithium ions, and an insulating thin film with high ion permeability and mechanical strength is used. The pore diameter of the separator is generally 0.01 to 10 ㎛, and the thickness is generally 5 to 300 ㎛. The material of the separator is preferably one selected from among polyethylene, polypropylene, a polyethylene / polypropylene double layer, a polyethylene / polypropylene / polyethylene triple layer, a polypropylene / polyethylene / polypropylene triple layer, and organic fiber filter paper, but is not limited thereto.

[0049] Meanwhile, the negative current collector and the positive current collector are composed of a portion coated with a slurry containing an active material and a non-coated portion where the slurry is not coated. The non-coated portion is formed by cutting the portion or connecting a separate conductive member to the non-coated portion by ultrasonic welding, etc. to form an electrode tab, and these electrode tabs are gathered to form a tab bundle.

[0050] The pouch case can be formed with a pocket portion capable of accommodating an electrode assembly and an edge portion extended to a certain length on one side of the pocket portion using a laminate sheet composed of an inner covering layer, a metal layer, and an outer covering layer.

[0051] Since the inner covering layer is in direct contact with the electrode assembly, it must have insulation and electrolytic resistance, and in order to seal it from the outside, the sealing area where the inner layers are thermally bonded must have excellent thermal bonding strength.

[0052] Materials for such inner covering layers may be selected from, but are not limited to, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, which have excellent chemical resistance and good sealing properties, polyurethane resins, and polyimide resins, and polypropylene, which has excellent mechanical properties such as tensile strength, rigidity, surface hardness, and impact strength, and excellent chemical resistance, is most preferable.

[0053] The metal layer in contact with the inner covering layer serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside, and a preferred material for this metal layer is an aluminum film that is lightweight and has excellent formability.

[0054] And, an outer covering layer is provided on the other side of the metal layer, and this outer covering layer can use a heat-resistant polymer with excellent tensile strength, moisture permeability, and air permeability to protect the electrode assembly while ensuring heat resistance and chemical resistance. For example, nylon or polyethylene terephthalate can be used, but is not limited thereto.

[0055] And a pair of electrode leads, each consisting of a positive lead and a negative lead, are typically connected to the aforementioned electrode tab bundle, more specifically, the positive tab bundle and the negative tab bundle, by welding or the like, and then protrude outside the pouch case.

[0056] The insulating film is positioned on the upper and lower surfaces of the electrode leads overlapping the heat-sealed pouch case sealing portion, and is configured to prevent electricity generated from the electrode assembly from flowing to the pouch case through the electrode leads and further maintain the sealing of the pouch case.

[0057] Here, it is preferable that the insulating film be a non-conductive material that does not conduct electricity well, and generally, an insulating tape that is easy to attach to the electrode lead and has a relatively thin thickness can be used.

[0058] Specifically, the insulating film may be one or two or more materials selected from the group consisting of polyimide (PI), polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polyvinyl chloride (PVC), high density polyethylene (HDPE), and epoxy resin, and is thermally bonded to the inner resin layer of the pouch case through heat and pressure.

[0059] Here, a guide hole (H) can be formed in each of the sealing portion, electrode lead, and insulating film of the pouch battery cell by the punch portion (200) described later.

[0060] At this time, the guide holes (H) formed in each of the sealing portion, the electrode lead, and the insulating film may be formed in the same position along the vertical extension line.

[0061] Additionally, two or more guide holes (H) can be formed.

[0062] Next, the punch section (200) is used to form a guide hole (H) in the sealing section, electrode lead, and insulating film of the pouch case. For example, it is formed in a cylindrical shape and pressurizes and cuts a set position to form a guide hole (H).

[0063] The punch section (200) can be provided in the same number as the guide holes (H) to be formed.

[0064] At this time, the punch section (200) can move in the horizontal and vertical directions, and if the number of guide holes (H) to be formed is less than that provided, the punch section (200) can be moved after forming the guide holes (H) on one side to form the guide holes (H) on the other side.

[0065] Here, two or more guide holes (H) are formed in the area where the sealing portion, electrode lead, and insulating film overlap. This is because, if there is only one guide hole (H), positional deviation, such as rotation based on one guide hole (H), may occur during subsequent position alignment.

[0066] In addition, the guide holes (H) formed in each of the sealing portion, electrode lead, and insulating film are formed at the same position along the vertical extension line, so that they can be aligned at a predetermined position when aligned.

[0067] The sealing tool (300) is used to seal by applying heat and pressure to the sealing portion located at the edge of the pouch case, and can be formed as a pair, each provided at the upper and lower portions of the sealing portion to be sealed.

[0068] A guide protrusion (310) having a certain height is formed on at least one of a pair of sealing tools (300).

[0069] The guide protrusion (310) is inserted into the guide hole (H) when the pouch case is pressed against it to align the positions of the sealing portion, electrode lead, and insulating film formed in the guide hole (H). It is formed at a position corresponding to the guide hole (H), and the same number as the guide hole (H) is formed.

[0070] Since the guide protrusion (310) is inserted into the guide hole (H) as described above, its horizontal cross-sectional shape may be the same as the horizontal cross-sectional shape of the guide hole (H).

[0071] In addition, the guide protrusion (310) may have a unit area that is the same as the upper part of the guide hole (H), and may have a shape in which the unit area decreases from the upper part to the lower part closer to the guide hole (H), which is to facilitate insertion of the guide protrusion (310) into the guide hole (H).

[0072] At this time, it is preferable that the height of the guide protrusion (310) be formed to be more than half of the sum of the heights of the guide holes (H) formed in each of the sealing portion, the electrode lead, and the insulating film. This is because, if the height of the guide protrusion (310) exceeds the sum of the heights of the guide holes (H), the sealing tool (300) may not be in close contact with the sealing portion by the guide protrusion (310), resulting in a sealing defect, and if it is less than half of the sum of the heights of the guide holes (H), the height of the guide protrusion (310) may be insufficient, resulting in a misalignment of the guide holes (H).

[0073] Fig. 5 is a cross-sectional view showing a sealing tool in a pouch battery cell sealing device according to a second preferred embodiment of the present invention.

[0074] Referring to FIG. 5, the pouch battery cell sealing device according to the second preferred embodiment of the present invention is identical to the pouch battery cell sealing device according to the first embodiment described in FIGS. 2 to 4, except that the sealing tool (300) is further provided with a receiving portion (320) and an elastic member (330), and therefore, a description of the same configuration will be omitted.

[0075] In a pouch battery cell sealing device according to the second embodiment of the present invention, a sealing tool (300) is configured to include a guide protrusion (310), a receiving portion (320), and an elastic member (330).

[0076] The guide protrusion (310) is provided to protrude at a certain height from the surface of the sealing tool (300) that is in close contact with the sealing portion of the pouch case.

[0077] The receiving portion (320) may be a space that can receive a part of the guide protrusion (310) and may be shaped to be recessed inward to a certain depth on the surface that is in close contact with the sealing portion of the sealing tool (300).

[0078] Since the receiving portion (320) receives the guide protrusion (310) as described above, the horizontal cross-sectional shape is formed to be identical to the horizontal cross-sectional shape of the guide protrusion (310).

[0079] The elastic member (330) is provided within the receiving portion (320) and is made of an elastic material capable of contraction and relaxation.

[0080] When a pair of sealing tools (300) are pressed closer than the height of the guide protrusion (310) to seal the sealing portion, the elastic member (330) contracts while a portion of the guide protrusion (310) is received inside the receiving portion (320), and when the pair of sealing tools (300) are separated after sealing is performed, the elastic member (330) relaxes to return the guide protrusion (310) to its original position.

[0081] Such elastic member (330) can prevent damage due to pressure applied to the guide protrusion (310) when a pair of sealing tools (300) are in close contact with each other beyond the standard through contraction and relaxation.

[0082] The elastic member (330) may be a spring that is easy to contract and relax, and may be rubber or silicone, etc., filled in the receiving portion (320). However, the material is not limited thereto as long as it can prevent the guide protrusion (310) from being damaged by pressure applied due to the operation of the sealing tool (300).

[0083] A pouch battery cell sealing method using a pouch battery cell sealing device according to a preferred embodiment of the present invention comprises a first step of mounting a pouch battery cell on a mounting jig, a second step of forming guide holes in each of a sealing portion, an electrode lead, and an insulating film of the pouch battery cell, and a third step of sealing the sealing portion using a pair of sealing tools.

[0084] First, the first step of mounting a pouch battery cell on a mounting jig is to mount the pouch battery cell on the upper surface of the mounting jig to seal the edge of the pouch case.

[0085] At this time, the pouch battery cell is installed so that a portion of the vertical extension protrudes from the upper surface of the installation jig, and more specifically, the sealing portion where the sealing is performed is installed so that the portion protrudes horizontally from the upper surface of the installation jig.

[0086] The mounting position of these pouch battery cells is to prevent the punch part from penetrating the sealing part and protruding to the lower part of the sealing part during the process of forming a guide hole in the sealing part and colliding with the mounting jig, and to ensure that the sealing tool is in close contact with the lower surface of the sealing part to perform sealing.

[0087] The second step of forming guide holes in each of the sealing portion, electrode lead, and insulating film of the pouch battery cell is a step of forming guide holes in the sealing portion, electrode lead, and insulating film using a punch portion.

[0088] Here, before the third step, a process of adjusting the position of the sealing tool by moving the sealing tool so that the guide protrusion of the sealing tool is in the same position along the vertical extension line as the guide hole formed in the second step can be further performed.

[0089] The third step of sealing the sealing part using a pair of sealing tools is the step of sealing by applying heat and pressure to the sealing part located at the edge of the pouch case using a pair of sealing tools.

[0090] When the sealing tool is in close contact with the sealing portion, the guide protrusions provided on the sealing tool are inserted into guide holes formed in each of the sealing portion, electrode lead, and insulating film, so that sealing is performed while the positions of the sealing portion, electrode lead, and insulating film are aligned.

[0091] In addition, the present invention may be a battery cell manufactured by the aforementioned pouch battery cell sealing method, and may be a battery module, battery pack, or device including the battery cell.

[0092] Anyone with ordinary skill in the art 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.

[0093] (Explanation of symbols)

[0094] 100: Settling jig

[0095] 200: Punch Department

[0096] 300: Sealing tool

[0097] 310: Guide protrusion

[0098] 320: Reception area

[0099] 330: Elastic member

[0100] C: Pouch battery cell

[0101] H: Guide Hall

Claims

1. A mounting jig in which a pouch battery cell equipped with an electrode lead and an insulating film located in the sealing portion of the pouch case is mounted; A punch portion forming a guide hole in each of the sealing portion, the electrode lead, and the insulating film; A pair of sealing tools for sealing the above sealing part; including: A pouch battery cell sealing device characterized in that the sealing tool has a guide protrusion formed on a surface facing the sealing portion.

2. In paragraph 1, A pouch battery cell sealing device characterized in that the punch portion forms two or more guide holes.

3. In paragraph 2, A pouch battery cell sealing device, characterized in that the guide holes formed in each of the sealing portion, the electrode lead, and the insulating film are formed at the same position along a vertical extension line.

4. In paragraph 1, A pouch battery cell sealing device characterized in that the above guide protrusion is formed at a position corresponding to the above guide hole.

5. In paragraph 2, A pouch battery cell sealing device characterized in that the above guide protrusions are formed in the same number as the above guide holes.

6. In paragraph 1, A pouch battery cell sealing device, characterized in that the guide protrusion has a horizontal cross-sectional shape identical to that of the guide hole.

7. In paragraph 6, A pouch battery cell sealing device characterized in that the guide protrusion has a shape in which the unit area decreases as it gets closer to the guide hole.

8. In paragraph 1, The above sealing tool has a receiving portion formed to accommodate the above guide protrusion, A pouch battery cell sealing device characterized in that the above-mentioned receiving portion is provided with an elastic member having elasticity.

9. In paragraph 8, A pouch battery cell sealing device characterized in that the elastic member is a spring.

10. In paragraph 1, A pouch battery cell sealing device, characterized in that the height of the guide protrusion is at least half the sum of the heights of the guide holes formed in each of the sealing portion, the electrode lead, and the insulating film.

11. A step of forming guide holes in each of the sealing portion, electrode lead, and insulating film of the pouch battery cell; and A step of sealing the sealing part using a pair of sealing tools; including; A pouch battery cell sealing method characterized in that, in the step of sealing the sealing part using the pair of sealing tools, a guide protrusion formed on the sealing tool is inserted into the guide hole.

12. In paragraph 11, A pouch battery cell sealing method characterized in that, prior to the step of sealing the sealing part using the pair of sealing tools, the position of the sealing tool is adjusted so that the guide protrusion is at the same position along the vertical extension line as the guide hole.

13. Electrode assembly: A pouch case for storing the above electrode assembly and having a sealing portion extending a certain length from the edge; An electrode lead having one end connected to the electrode tab of the electrode assembly and the other end protruding outward from the pouch case; and Including an insulating film provided between the sealing portion and the electrode lead; A pouch battery cell characterized in that a guide hole is formed in each of the sealing portion, the electrode lead, and the insulating film.

14. In paragraph 13, A pouch battery cell characterized in that the guide holes formed in each of the sealing portion, the electrode lead, and the insulating film are formed at the same position along a vertical extension line.

15. In paragraph 14, A pouch battery cell characterized in that two or more guide holes are formed.

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