Pouch film, pouch cell, cell laminate, method for manufacturing pouch film, and method for manufacturing pouch cell

Abstract

The present invention relates to a pouch cell and a method for manufacturing the same, which can efficiently discharge gas from inside the pouch to the outside of the pouch, so as to delay or prevent the occurrence of a venting phenomenon of the pouch due to internal gas generated during the charging or discharging process of the pouch cell. The pouch cell according to the present invention includes an electrode assembly and a pouch in which the electrode assembly is disposed, and the pouch may include a first layer and a second layer through which gas is permeable, and a barrier layer disposed between the first layer and the second layer, with a plurality of holes formed therein so as to allow gas to pass through.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0074464 filed on June 9, 2023, and all the contents disclosed in the literature of the Korean patent application are incorporated herein by reference in their entirety.

[0002] The present invention relates to a pouch cell and a method for manufacturing the same, and more particularly, to a secondary battery pouch cell capable of charging and discharging, a pouch film used for manufacturing the pouch cell, a cell stack in which a plurality of pouch cells are stacked, a method for manufacturing the pouch film, and a method for manufacturing the pouch cell.

Background Art

[0003] In recent years, due to the depletion of fossil fuels, the price of energy sources has increased, and the concern about environmental pollution has amplified. The need for environmentally friendly alternative energy sources has become an essential and indispensable factor for future life. Therefore, research on various power generation technologies such as solar power, wind power, and tidal power has continued, and there has also been a great deal of interest in power storage devices such as batteries for more efficiently using the electrical energy thus produced.

[0004] Furthermore, as the technology development and demand for electronic mobile devices and electric vehicles using batteries increase, the demand for batteries as an energy source has rapidly increased. Along with this, many studies have been conducted on batteries that can meet various needs.

[0005] Batteries for storing electrical energy can generally be divided into primary batteries and secondary batteries. Primary batteries are disposable consumable batteries, while secondary batteries are rechargeable batteries manufactured using materials in which the oxidation and reduction processes between current and substances can be repeated. That is, when a reduction reaction is performed on the material by current, the power source is charged, and when an oxidation reaction is performed on the material, the power source discharges, and electricity is generated while such charging and discharging are repeated.

[0006] Rechargeable batteries can be classified into cylindrical cells, pouch cells, and prismatic cells, depending on their form. Of these, pouch cells can be manufactured by housing an electrode assembly, in which a positive electrode, negative electrode, separator, etc., are stacked inside a pouch, and the outside of the pouch is sealed.

[0007] On the other hand, the pouch of a pouch cell can contain an electrolyte along with the electrode assembly. Here, remaining water in the electrolyte and water that has seeped in from the outside react with the lithium salt inside the pouch of the pouch cell to generate HF (hydrogen fluoride), and gases such as carbon dioxide, carbon monoxide, ethylene, and methane may be generated due to the decomposition of the electrolyte. In addition, hydrogen and HF may be further generated depending on the material of the positive electrode contained in the electrode assembly of the pouch cell, and overheating may occur due to overcharging and internal short circuits during the charging and discharging process. Consequently, a large amount of gas may be generated inside the pouch. Such gases can increase the pressure inside the pouch, and this increased pressure can cause swelling, where the pouch expands, or venting, where a part of the pouch ruptures.

[0008] Conventional pouch cells experienced pressure increases due to internal gases, which damaged the seal in the sealed area. Furthermore, this reduced seal led to a problem where the pouch would vent due to the pressure.

[0009] Since pouch cells that experience venting cannot function as secondary batteries, there is a need for pouch cells that include a configuration that allows gas inside the pouch to be discharged to the outside of the pouch in order to prevent or delay the occurrence of venting. [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] The object of the present invention is to provide a pouch cell and a method for manufacturing the same that can efficiently discharge gas from inside the pouch to the outside of the pouch, so as to delay or prevent the venting phenomenon of the pouch from occurring due to internal gas generated during the charging or discharging process of the pouch cell. [Means for solving the problem]

[0011] The pouch cell according to the present invention includes an electrode assembly and a pouch in which the electrode assembly is disposed, the pouch including a first layer and a second layer through which a gas can pass, and a barrier layer disposed between the first layer and the second layer and having a plurality of holes formed therein to allow the gas to pass through.

[0012] The pouch includes a cup portion in which the electrode assembly is housed and a terrace portion disposed on the periphery of the cup portion, and the holes in the barrier layer can be formed in the terrace portion.

[0013] The terrace portion includes a sealing portion that is sealed by a sealant, and the hole in the barrier layer can be formed between the cup portion and the sealing portion.

[0014] The pouch includes a cup portion having one surface on which the electrode assembly is placed and a peripheral surface connected to the periphery of the one surface, and the holes in the barrier layer can be formed on the peripheral surface.

[0015] The aforementioned plurality of holes can be arranged so as to be spaced apart from each other.

[0016] The pouch may further include a nylon layer disposed between the barrier layer and the second layer, which is provided with a nylon-based resin.

[0017] The pouch cell according to the present invention includes an electrode assembly and a pouch in which the electrode assembly is disposed, wherein the pouch may be provided with a permeable layer containing a polymer and through which gases can pass, and a barrier layer containing a metal and having a plurality of holes formed therein to allow gases to pass through.

[0018] The pouch film according to the present invention includes a first layer and a second layer through which gas can pass, and a barrier layer disposed between the first layer and the second layer, wherein a plurality of holes can be formed in the barrier layer so as to allow gas to pass through.

[0019] The cell laminate according to the present invention comprises a plurality of pouch cells, each including an electrode assembly and a pouch in which the electrode assembly is disposed, wherein the pouch includes a first and second layer through which gas is permeable, and a barrier layer disposed between the first and second layers, with a plurality of holes formed therein to allow gas to pass through, the plurality of holes may be formed on surfaces other than those in contact with other adjacent pouch cells.

[0020] The method for manufacturing a pouch film according to the present invention is used in the manufacture of a pouch cell and includes the steps of: forming a plurality of holes in a metal film containing metal so that gas can pass through; placing the metal film on one surface of a first film containing a polyolefin resin; placing a second film on one surface of the metal film; and laminating the first film, the metal film, and the second film.

[0021] The second film may include a nylon film containing a nylon-based resin and disposed on one surface of the metal film, and an outer film containing an insulating material and disposed on one surface of the nylon film.

[0022] The method for manufacturing a pouch cell according to the present invention includes a step of forming a plurality of holes in a first region of a metal film containing metal so that gas can pass through, a step of disposing the metal film on one surface of a first film containing a polyolefin resin, a step of disposing a second film on one surface of the metal film, a step of laminating the first film, the metal film, and the second film to manufacture a pouch film, a step of forming a second region separated from the first region in the pouch film to form a portion for accommodating an electrode assembly, a step of disposing the electrode assembly in the formed portion of the pouch film, and a step of sealing the pouch film so as to be sealed.

Advantages of the Invention

[0023] According to a preferred embodiment of the present invention, gas inside the pouch generated during the charging or discharging process of the pouch cell can be efficiently discharged to the outside.

[0024] Thereby, the occurrence of the bending phenomenon of the pouch due to the gas inside the pouch can be delayed or prevented, and the safety of the pouch cell can be improved.

[0025] In addition, since the gas discharged in a state where a plurality of pouch cells are stacked does not go toward adjacent pouch cells, the gas can be efficiently discharged.

[0026] In addition, since the holes formed in the barrier layer for discharging gas do not affect the bonding relationship of other configurations, it is possible to prevent the bonding force between the configurations forming the pouch cell from being weakened.

[0027] In addition, since holes are formed in the barrier layer during the manufacture of the pouch film, an additional step of bonding gas discharge components is unnecessary, and the efficiency of the manufacturing process of the pouch cell can be improved.

[0028] The effects of the present invention are not limited to the content exemplified above, and various other effects are included in this specification.

Brief Description of the Drawings

[0029] [Figure 1] It is a perspective view schematically showing a pouch cell according to Embodiment 1 of the present invention. [Figure 2] It is a cross-sectional view schematically showing a cross-section taken along A-A' of FIG. 1 of the present invention. [Figure 3] It is a plan view schematically showing a barrier layer of a pouch according to Embodiment 1 of the present invention. [Figure 4] It is a perspective view schematically showing a pouch cell according to Embodiment 2 of the present invention. [Figure 5] It is a cross-sectional view schematically showing a cross-section taken along A-A' of FIG. 4 of the present invention. [Figure 6] It is a plan view schematically showing a cell laminate in a form in which a plurality of pouch cells according to Embodiment 2 of the present invention are stacked. [Figure 7] It is a flowchart schematically showing a method for manufacturing a pouch cell according to Embodiment 3 of the present invention.

Modes for Carrying Out the Invention

[0030] Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement it. However, the present invention can be realized in various different forms and is not limited or restricted by the following embodiments.

[0031] To clearly explain the present invention, detailed descriptions of parts not related to the explanation or related known technologies that may obscure the gist of the present invention are omitted. In this specification, when attaching reference numerals to the components of each drawing, the same or similar reference numerals are given to the same or similar components throughout the specification.

[0032] Furthermore, the terms and words used in this specification and in the claims should not be interpreted in a manner limited to their ordinary or dictionary meanings, but rather should be interpreted in a manner consistent with the technical idea of ​​the present invention, in accordance with the principle that inventors may define the concepts of terms as appropriate to best describe their invention.

[0033] Embodiment 1 Figure 1 is a schematic perspective view illustrating a pouch cell 10 according to Embodiment 1 of the present invention, and Figure 2 is a schematic cross-sectional view illustrating a cross section cut along line A-A' in Figure 1 of the present invention.

[0034] The pouch cell 10 described in the present invention may mean a rechargeable and dischargeable secondary battery. Specifically, it may mean a secondary battery in which an electrode assembly 100 including a negative electrode, a positive electrode, and a separator is placed inside a pouch 200, and the pouch 200 encloses the electrode assembly 100. More specifically, the pouch cell 10 may mean a secondary battery in which an electrode assembly 100 including a negative electrode, a positive electrode, and a separator is housed inside a pouch 200 together with an electrolyte. However, the pouch cell 10 described in Embodiment 1 of the present invention is merely an example, and the invention is applicable to other pouch cells, such as those in which both ends are sealed with caps and the periphery is surrounded by a pouch.

[0035] The electrode assembly 100 may have a configuration in which the negative electrode, positive electrode, and separator are stacked or in a wound jelly roll configuration, and the pouch 200 may contain the electrode assembly 100. Specifically, the pouch 200 may include a cup portion molded to accommodate the electrode assembly 100 and the electrolyte inside.

[0036] Referring to Figure 1, the electrode leads 300 can be arranged in a manner that they are electrically connected to the electrode assembly 100 and protrude outside the pouch 200. The electrode leads 300 protruding outside the pouch 200 allow the pouch cell 10 to provide electrical energy to the outside. Therefore, the electrode leads 300 can be conductors.

[0037] The lead film can cover the electrode lead 300 so that the pouch 200 and the electrode lead 300 are insulated from each other. Specifically, the lead film can be placed on both sides of the electrode lead 300 to cover it. The lead film can be configured in pairs and placed on each side of the electrode lead 300.

[0038] On the other hand, to insulate the pouch 200 from the electrode lead 300, the lead film may contain an insulating material. The electrode lead 300 may, but is not necessarily limited to, a substantially rectangular parallelepiped shape.

[0039] As the pouch cell 10 undergoes repeated charging and discharging, gas is generated, which can increase the pressure inside the pouch 200. If the pressure inside the pouch 200 increases too much, phenomena such as venting may occur, and the pouch cell 10 may lose its function.

[0040] In this regard, the pouch cell 10 according to Embodiment 1 of the present invention can have holes 2021 formed in a part of the layers constituting the pouch 200 in order to efficiently discharge gas. That is, the pouch 200 can be composed of multiple layers. Here, among the multiple layers constituting the pouch 200, the layer in which the holes 2021 are formed allows gas to move through the holes 2021, while the other layers allow gas to move by permeation. Therefore, gas generated inside the pouch 200 can be discharged to the outside of the pouch 200 by the internal pressure.

[0041] Referring to Figure 2, the pouch 200 according to Embodiment 1 of the present invention may include a first layer 201, a barrier layer 202, and a second layer 204. That is, a pouch film including the first layer 201, the barrier layer 202, and the second layer 204 can be formed to produce the pouch 200. The first layer 201 and the second layer 204 of the pouch 200 are permeable to gas, and the barrier layer 202 can be placed between the first layer 201 and the second layer 204. Here, a plurality of holes 2021 through which gas can pass can be formed in the barrier layer 202 of the pouch 200. Since the barrier layer 202 is a layer that is difficult for gas to permeate, gas can pass through the barrier layer 202 through the holes 2021 formed in the barrier layer 202.

[0042] However, the layer structure of the pouch 200 described in Embodiment 1 of the present invention is merely an example, and may consist of two layers. For example, the pouch may include a permeable layer made of a polymer such as a polyolefin resin, through which gas can pass, and a barrier layer made of a metal such as stainless steel, through which multiple holes are formed to allow gas to pass. In this case, it can be easily applied to other pouch cells, such as the form in which both ends are sealed with caps and the periphery is surrounded by a pouch.

[0043] The first layer 201 of pouch 200 is made of a polymer and can have heat-sealing properties as the innermost layer of pouch 200. That is, it can partially melt and become adhesive when heated. Therefore, the pouch 200 can be sealed by bonding the opposing first layers 201 together through sealing. As an example, the polymer used to make the first layer 201 of pouch 200 can consist of one or more substances selected from the group consisting of polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acrylic polymers, polyacrylonitrile, polyimide, polyamide, cellulose, aramid, nylon, polyester, poly(p-phenylenebenzobisoxazole), polyarylate, Teflon®, and glass fiber. In particular, polyolefin resins such as polypropylene (PP) or polyethylene (PE) can be used. Polypropylene (PP) has excellent mechanical properties such as tensile strength, rigidity, surface hardness, abrasion resistance, and heat resistance, as well as excellent chemical properties such as corrosion resistance, and can be mainly used to manufacture the first layer 201. Furthermore, it may be composed of unoriented polypropylene (Cated Polypropylene), acid-modified polypropylene, or polypropylene-butylene-ethylene ternary copolymer. Here, acid-modified polypropylene can be MAH PP (Malayic anhydride polypropylene). In addition, the first layer 201 may have a single film structure composed of one of these materials, or a composite film structure formed by two or more materials each forming layers.

[0044] The second layer 204 of pouch 200 is the outermost layer of pouch 200, is made of polymer, and is formed on the outermost surface to protect the pouch cell 10 from friction and impact with the outside. The second layer 204 can also electrically insulate the electrode assembly 100 from the outside. As an example, the polymer used to manufacture the second layer 204 of pouch 200 can be one or more substances selected from the group consisting of polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acrylic polymers, polyacrylonitrile, polyimide, polyamide, cellulose, aramid, nylon, polyester, poly(p-phenylenebenzobisoxazole), polyarylate, Teflon®, and glass fiber. In particular, it is preferable to use a polymer such as polyethylene terephthalate (PET) which has abrasion resistance and heat resistance. The second layer 204 may have a single film structure made of any one of these substances, or a composite film structure formed by two or more substances each forming a layer.

[0045] The barrier layer 202 of pouch 200 may include, but is not limited to, a metal selected from the group consisting of copper (Cu), aluminum (Al), nickel (Ni), iron (Fe), carbon (C), chromium (Cr), manganese (Mn), and alloys containing two or more of these. Preferably, the barrier layer 202 may include a metal selected from aluminum alloys and stainless steel (SUS).

[0046] Figure 3 is a schematic plan view illustrating the barrier layer 202 of the pouch 200 according to Embodiment 1 of the present invention.

[0047] In the barrier layer 202 of the pouch 200 according to Embodiment 1 of the present invention, a plurality of holes 2021 through which gas can move can be formed. Here, the holes 2021 only need to have a shape that facilitates gas movement, and the size, arrangement, and shape of the holes 2021 can vary. For example, the holes 2021 can be circular, and a plurality of holes 2021 can be arranged with a certain interval between them. When the holes 2021 are arranged with a certain interval between them, the movement of gas can be distributed relatively uniformly, enabling efficient gas discharge. In addition, the process of forming the holes 2021 can be simplified, and the efficiency of the manufacturing process can be improved. Referring to Figure 3, a plurality of holes 2021 can be formed with a certain interval between them and in the same pattern.

[0048] More specifically, for example, the portion of the barrier layer 202 in which the hole 2021 is formed can be a rectangle approximately 17 mm wide and 10 mm high. One large hole may be formed in this portion, or several small holes may be formed. Depending on the strength of the pouch 200 and the gas discharge rate, approximately 1 to 24 holes can be formed.

[0049] On the other hand, the pouch 200 according to Embodiment 1 of the present invention may further include a nylon layer 203. The nylon layer 203 can be positioned between the barrier layer 202 and the second layer 204 and may contain a nylon-based resin. By including the nylon layer 203 containing a nylon-based resin, the pouch 200 can have improved moldability due to its excellent stretchability.

[0050] The pouch 200 of the pouch cell 10 according to Embodiment 1 of the present invention may include a cup portion 210 and a terrace portion 220. Specifically, the electrode assembly 100 is housed in the cup portion 210, and the terrace portion 220 can be arranged on the periphery of the cup portion 210. Here, a hole 2021 can be formed in the terrace portion 220. That is, the hole 2021 can be formed in a portion separated from the portion where the electrode assembly 100 is located. When a hole 2021 is formed in the terrace portion 220, the gas attempting to move to the outside of the pouch 200 is subjected to relatively little interference from the electrode assembly 100, and the gas can be efficiently discharged to the outside of the pouch 200.

[0051] More specifically, the hole 2021 can be formed between the cup portion 210 and the sealing portion 230. In this regard, the terrace portion 220 may include the sealing portion 230. Here, the sealing portion may mean the portion of the terrace portion 220 that is sealed by the sealing. That is, the sealing portion may mean the portion of the pouch 200 that is sealed by heat and pressure. When the hole 2021 is formed in the sealing portion 230, the sealing portion 230 can be in a form in which opposing surfaces of the pouch 200 are bonded together by the sealing. Therefore, there may be a relative lack of space on the path for gas inside the pouch 200 to move to the outside of the pouch 200. In the pouch cell 10 according to Embodiment 1 of the present invention, since the hole 2021 is formed in the terrace portion 220 other than the sealing portion 230, gas can be efficiently discharged to the outside of the pouch 200.

[0052] On the other hand, the cup portion 210 of the pouch 200 can be formed by molding a pouch film composed of multiple layers. The pouch film can be pressed using a molding apparatus including a punch and die to form a concave cup portion 210 in which the electrode assembly 100 is positioned. Here, the area around the unformed cup portion 210 can become a terrace portion 220.

[0053] In the pouch cell 10 according to Embodiment 1 of the present invention, the path by which gas is discharged to the outside of the pouch 200 is as follows: Repeated charging and discharging generates gas inside the pouch 200, and as the gas increases, the internal pressure and concentration of the pouch 200 increase. Here, the gas permeates through the first layer 201 and moves through holes 2021 formed in the barrier layer 202. Subsequently, the gas can permeate through the nylon layer 203 and the second layer 204 and be discharged to the outside of the pouch 200.

[0054] In the pouch cell 10 according to Embodiment 1 of the present invention, the pouch 200 can efficiently discharge gas from inside the pouch 200 to the outside of the pouch 200 through holes 2021 formed in the barrier layer 202. Furthermore, no additional components are required, improving the efficiency of the manufacturing process. It can be manufactured with the same external shape as a conventional pouch cell 10 and can be applied similarly to conventional frames, etc.

[0055] The pouch cell 10 according to Embodiment 1 of the present invention can efficiently discharge gas from inside the pouch 200 to the outside. Therefore, this can delay or prevent venting and other issues from occurring, and improve the stability of the pouch cell 10.

[0056] Embodiment 2 Figure 4 is a schematic perspective view illustrating a pouch cell 10' according to Embodiment 2 of the present invention, and Figure 5 is a schematic cross-sectional view illustrating a cross section cut along line A-A' in Figure 4 of the present invention.

[0057] Hereinafter, a detailed explanation of the configuration of the pouch cell 10 according to Embodiment 1 of the present invention will be omitted, and the differences will be explained in detail.

[0058] The pouch cell 10' according to Embodiment 2 of the present invention may have a different position in which the hole 2021 is formed compared to the pouch cell 10 according to Embodiment 1 of the present invention.

[0059] Referring to Figures 4 and 5, the pouch 200' of the pouch cell 10' according to Embodiment 2 of the present invention may include a cup portion 210' and a terrace portion 220'. Here, the cup portion 210' of the pouch 200' may include a peripheral surface 212 below one surface 211. Specifically, one surface 211 of the cup portion 210' may be the surface on which the electrode assembly 100 is placed, and the peripheral surface 212 may be the surface connected to the periphery of the one surface 211. If one surface 211 of the cup portion 210' has a substantially rectangular cross-section, the peripheral surface 212 may include four surfaces.

[0060] In the pouch 200' of the pouch cell 10' according to Embodiment 2 of the present invention, the holes 2021 of the barrier layer 202 can be formed on the peripheral surface 212 of the cup portion 210'. Referring to Figure 5, the distance between the peripheral surface 212 of the cup portion 210' and the electrode assembly 100 can be even longer than the distance between one surface 211 of the cup portion 210' and the electrode assembly 100. Therefore, when the holes 2021 are formed on the peripheral surface 212 of the cup portion 210', the gas attempting to move to the outside of the pouch 200' is subjected to relatively little interference from the electrode assembly 100, and the gas can be efficiently discharged to the outside of the pouch 200'.

[0061] Figure 6 is a schematic plan view illustrating a cell laminate in which multiple pouch cells 10' according to Embodiment 2 of the present invention are stacked.

[0062] When a large amount of electrical energy is required, multiple pouch cells 10' can be assembled to form a battery module. In this case, a cell stack, in which multiple pouch cells 10' are stacked, can be arranged inside the battery module. In this case, gas can be discharged from each of the multiple pouch cells 10' according to Embodiment 2 of the present invention.

[0063] Referring to Figure 6, in a cell laminate in which multiple pouch cells 10' are stacked according to Embodiment 2 of the present invention, the multiple holes 2021 formed in one pouch cell 10' can be formed on surfaces other than those that come into contact with adjacent pouch cells 10'. That is, the peripheral surface 212 of the cup portion 210' in which the multiple holes 2021 are formed in the pouch cell 10' can be a surface that does not come into contact with adjacent pouch cells 10'.

[0064] When multiple holes 2021 are formed on one surface 211 of the cup portion 210', there is a risk that the gas discharge performance may be reduced by adjacent pouch cells 10' when gas inside the pouch 200' is discharged. However, in the cell laminate in which multiple pouch cells 10' are stacked according to Embodiment 2 of the present invention, when gas inside the pouch 200' of each pouch cell 10' is discharged, it is subjected to relatively little interference from other pouch cells 10', and the gas can be efficiently discharged to the outside of the pouch 200'.

[0065] The pouch cell 10' according to Embodiment 2 of the present invention can efficiently discharge gas from inside the pouch 200' to the outside, even when applied to a battery module.

[0066] Embodiment 3 Figure 7 is a flowchart illustrating a schematic method for manufacturing pouch cells according to Embodiment 3 of the present invention.

[0067] A method for manufacturing a pouch cell according to Embodiment 3 of the present invention may include the step of manufacturing a pouch film. First, it may include the step (S1) of forming a plurality of holes 2021 in a metal film containing metal. Specifically, the method for manufacturing a pouch cell may include the step (S1) of forming a plurality of holes 2021 so that gas can pass through a first region of the metal film. Here, the plurality of holes 2021 can be formed in a portion of the metal film.

[0068] Subsequently, a step (S2) can be performed in which a metal film is placed on one surface of the first film. Here, the first film may contain a polyolefin resin. A second film can be placed on one surface of the metal film placed on one surface of the first film. That is, a step (S3) can be performed in which the second film is placed on one surface of the metal film. Thus, one surface of the metal film can be in contact with the second film, and the other surface of the metal film can be in contact with the first film.

[0069] Subsequently, a step (S4) can be performed in which the first film, the metal film, and the second film are laminated to produce a pouch film. Here, lamination may mean a process of bonding using heat and pressure.

[0070] After the pouch film is manufactured, a step (S5) can be performed in which a second region is formed in the pouch film to form a portion in which the electrode assembly 100 is housed. Here, the second region can be separated from the first region in which the multiple holes 2021 are formed. Therefore, the portion formed in the pouch film can be a portion in which no holes 2021 are formed. The first region in the pouch film in which the holes 2021 are formed and the second region in which they are formed are different parts from each other, and the holes 2021 can be unaffected by the molding of the pouch film.

[0071] After the pouch film is formed, a step (S6) can be performed in which the electrode assembly 100 is placed on the formed portion of the pouch film. Subsequently, a step (S7) can be performed in which the pouch film is sealed. Here, the pouch film can be sealed by sealing with heat and pressure.

[0072] On the other hand, in the method for manufacturing a pouch cell according to Embodiment 3 of the present invention, the second film may include a nylon film and an outer film. Specifically, the nylon film may contain a nylon-based resin and be arranged on one side of the metal film. The outer film may contain an insulating material and be arranged on one side of the nylon film.

[0073] The method for manufacturing a pouch cell according to Embodiment 3 of the present invention only adds a step of forming holes 2021 in the metal film during the manufacturing process of the pouch film, and does not involve any additional steps to add the structure after the pouch film has been sealed. Therefore, a pouch cell 10 that can discharge gas can be manufactured by a relatively efficient manufacturing process.

[0074] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible by persons with ordinary skill in the art to which the present invention pertains, within the equivalent scope of the technical concept of the present invention and the claims described below. [Explanation of symbols]

[0075] 10, 10' pouch cell 100 electrode assembly 200, 200' pouch 201 1st layer 202 Barrier layer 203 Nylon layer 204 2nd layer 210, 210' cup section 211 One page 212 Peripheral surface 220, 220' Terrace section 230 Sealing section 300 electrode leads 2021 Hall

Claims

1. Electrode assembly and The device includes a pouch in which the electrode assembly is arranged, The aforementioned pouch is The first and second layers through which the gas permeates, A pouch cell comprising a barrier layer disposed between the first layer and the second layer, having a plurality of holes formed therein to allow gas to pass through.

2. The aforementioned pouch is The aforementioned electrode assembly is housed in a cup portion, The cup portion includes a terrace portion arranged around the periphery of the cup portion, The pouch cell according to claim 1, wherein the holes in the barrier layer are formed in the terrace portion.

3. The aforementioned terrace section is Including a sealing portion that is sealed by a sealant, The pouch cell according to claim 2, wherein the hole in the barrier layer is formed between the cup portion and the sealing portion.

4. The aforementioned pouch is The cup portion includes one surface on which the electrode assembly is placed and a peripheral surface connected to the periphery of the one surface, The pouch cell according to claim 1, wherein the holes in the barrier layer are formed on the peripheral surface.

5. The aforementioned multiple halls are The pouch cells according to claim 1, arranged so as to be spaced apart from each other.

6. The aforementioned pouch is The pouch cell according to any one of claims 1 to 5, further comprising a nylon layer disposed between the barrier layer and the second layer and comprising a nylon-based resin.

7. Electrode assembly and The device includes a pouch in which the electrode assembly is arranged, The aforementioned pouch contains: A permeable layer containing polymers and through which gases can pass, A pouch cell comprising a barrier layer containing metal and having multiple holes formed therein to allow gas to pass through.

8. The first and second layers through which the gas permeates, The invention includes a barrier layer disposed between the first layer and the second layer, The barrier layer includes, A pouch film in which multiple holes are formed to allow gas to pass through.

9. A cell laminate comprising a plurality of pouch cells, each including an electrode assembly and a pouch in which the electrode assembly is placed, The aforementioned pouch is The first and second layers through which the gas permeates, The system includes a barrier layer disposed between the first layer and the second layer, having a plurality of holes formed therein so that gas can pass through, The aforementioned plurality of holes are formed on surfaces other than those in contact with other adjacent pouch cells in the cell laminate.

10. A method for manufacturing pouch film used in the production of pouch cells, The steps include forming multiple holes in a metal film containing metal so that gas can pass through, The steps include: placing the metal film on one surface of a first film containing a polyolefin resin; The steps include: placing the second film on one surface of the metal film; A method for manufacturing a pouch film, comprising the step of laminating the first film, the metal film, and the second film.

11. The aforementioned second film is A nylon film containing a nylon-based resin, which is disposed on one surface of the metal film, A method for manufacturing a pouch film according to claim 10, comprising an outer film containing an insulating material and disposed on one surface of the nylon film.

12. The steps include forming a plurality of holes in a first region of a metal film containing metal so that gas can pass through, The steps include: placing the metal film on one surface of a first film containing a polyolefin resin; The steps include: placing the second film on one surface of the metal film; A step of manufacturing a pouch film by laminating the first film, the metal film, and the second film, The steps include forming a second region separated from the first region in the pouch film to form a portion in which the electrode assembly is housed, The steps include: placing the electrode assembly on the molded portion of the pouch film; A method for manufacturing a pouch cell, comprising the step of sealing the pouch film so that it is airtight.

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