Pouch film laminate, pouch-type battery case, and pouch-type secondary battery

Abstract

The present invention relates to a pouch film laminate including an insulating auxiliary layer, a gas barrier layer, and a sealant layer sequentially laminated, wherein the insulating auxiliary layer includes a stretched auxiliary layer and a plurality of island portions disposed on the stretched auxiliary layer, and the island portions include an insulating material.

Description

Pouch film laminate, pouch-type battery case, and pouch-type secondary battery

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0192945 filed on December 20, 2024, the entire contents of which are incorporated herein.

[0003]

[0004] Technology field

[0005] The present invention relates to a pouch film laminate, a pouch-type battery case, and a pouch-type secondary battery.

[0006]

[0007] Secondary batteries are used not only in small products such as digital cameras, P-DVDs, MP3 players, mobile phones, PDAs, portable game devices, power tools, and E-bikes, but also in large products requiring high output such as electric vehicles and hybrid vehicles, as well as in power storage devices that store surplus power or new and renewable energy and backup power storage devices.

[0008] Typically, a secondary battery is manufactured by applying an electrode active material slurry to a positive electrode current collector and a negative electrode current collector to produce a positive electrode and a negative electrode, and then stacking them on both sides of a separator to form an electrode assembly of a predetermined shape, and then housing the electrode assembly in a battery case and sealing it after injecting an electrolyte.

[0009] Secondary batteries are classified into pouch type and can type depending on the material of the case housing the electrode assembly. The pouch type houses the electrode assembly in a pouch made of a flexible polymer material. The can type, on the other hand, houses the electrode assembly in a case made of materials such as metal or plastic.

[0010] A pouch-type battery case is manufactured by performing press processing on a flexible pouch film laminate to form a cup portion. Then, once the cup portion is formed, an electrode assembly is housed in the receiving space of the cup portion and a sealing portion is sealed to manufacture a secondary battery.

[0011] Among these press processes, drawing forming is performed by inserting a pouch film into a press machine and applying pressure to the pouch film laminate with a punch to stretch the pouch film laminate. The pouch film laminate is generally formed of multiple layers in which a polymer film, such as polyethylene terephthalate, is laminated on one side of a metal gas barrier layer, and a sealant layer is laminated on the other side.

[0012] Meanwhile, as the demand for high-capacity batteries, such as those for electric vehicles or ESS batteries, has recently increased, there is a growing demand for battery cases capable of accommodating more electrode assemblies. Accordingly, a two-cup molding method is being attempted to increase the volume of the cup portion by increasing the molding depth of the pouch-type battery case or by molding the cup portion in the upper case and the lower case separately.

[0013] In the manufacture of conventional pouch film laminates, a polyethylene terephthalate (PET) film is placed on the outermost layer of the pouch film laminate to prevent corrosion caused by the external environment and maintain insulation. However, the polyethylene terephthalate film has a thick thickness, which lowers energy density, and due to its low elongation at break, there is a problem that the maximum forming depth is reduced when forming a pouch case.

[0014] To solve the above problem, a method was proposed to apply a thin coating layer containing an insulating material, rather than a polyethylene terephthalate film, to the outermost layer of the pouch film laminate; however, similar to the case of laminating polyethylene terephthalate films, problems such as low energy density and reduced maximum forming depth during pouch case molding still exist.

[0015] Therefore, there is a need for a pouch film laminate that can increase energy density and prevent the problem of reduced maximum molding depth during pouch case molding while maintaining insulation.

[0016]

[0017] One objective of the present invention is to solve the above-mentioned problems by arranging an insulating auxiliary layer, comprising an extension auxiliary layer and a plurality of island portions disposed on the extension auxiliary layer, on the outermost layer of the pouch film laminate, and including an insulating material in the island portions, thereby providing a pouch film laminate that has excellent energy density, excellent maximum molding depth, and can maintain insulation.

[0018]

[0019] In addition, another objective of the present invention is to solve the above-mentioned problems by providing a pouch-type battery case manufactured by drawing molding a pouch film laminate according to the present invention and a pouch-type secondary battery including the same.

[0020]

[0021] However, the problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below.

[0022]

[0023] [1] The present invention provides a pouch film laminate comprising a sequentially laminated insulating auxiliary layer, a gas barrier layer, and a sealant layer, wherein the insulating auxiliary layer comprises a stretching auxiliary layer and a plurality of island portions disposed on the stretching auxiliary layer, and the island portions comprise an insulating material.

[0024] [2] In the above [1], the insulating auxiliary layer may have a thickness of 5 μm to 100 μm.

[0025] [3] In the invention [1] or [2], the insulating auxiliary layer may have a break elongation of 50% to 350%.

[0026] [4] In at least one of [1] to [3], the stretching auxiliary layer may have a thickness of 5 μm to 100 μm.

[0027] [5] In at least one of [1] to [4], the stretching auxiliary layer may include nylon.

[0028] [6] In at least one of [1] to [5], the plurality of island portions may be spaced apart and arranged independently.

[0029] [7] In at least one of [1] to [6] above, the island portion has a maximum height (T I ) may be 100㎛ or less.

[0030] [8] In at least one of [1] to [7], the insulating material may comprise one or more selected from the group consisting of polypropylene (PP), SBR (Styrene Butadiene Rubber), NBR (Nitrile-butadiene rubber), urethane rubber, VMQ (silicone rubber), polyvinyl chloride, polyethylene (PE), polyurethane (PU) resin, epoxy resin, glass fiber and asbestos.

[0031] [9] In at least one of [1] to [8], the gas barrier layer may have a thickness of 20 μm to 150 μm.

[0032]

[0010] In at least one of [1] to [9], the sealant layer may have a thickness of 30 μm to 130 μm.

[0033]

[0011] In at least one of [1] to

[0010] , the pouch film laminate may have a thickness of 120 μm to 300 μm.

[0034]

[0012] In at least one of [1] to

[0011] , the present invention may further include an adhesive layer between the gas barrier layer and the insulating auxiliary layer.

[0035]

[0013] The present invention provides a pouch-type battery case manufactured by drawing molding at least one of the pouch film laminates [1] to

[0012] .

[0036]

[0014] The present invention provides a pouch-type secondary battery comprising the pouch-type battery case of

[0013] .

[0037]

[0038] The pouch film laminate according to the present invention comprises a stretching auxiliary layer on the outermost layer and a plurality of island portions disposed on the stretching auxiliary layer, wherein the island portions comprise an insulating material. Due to the above characteristics, high energy density can be achieved, and excellent moldability can be realized by having an island portion shape rather than a film or coating shape, while maintaining insulation.

[0039]

[0040] The drawings attached to this specification illustrate preferred embodiments of the present invention and serve to help to better understand the technical concept of the present invention together with the description of the invention above; therefore, the present invention is not to be interpreted as being limited only to the matters described in such drawings. Meanwhile, the shape, size, scale, or ratio of elements in the drawings included in this specification may be exaggerated to emphasize a clearer explanation.

[0041] FIG. 1 is a cross-sectional view of a pouch film laminate according to one embodiment of the present invention.

[0042] FIG. 2 is a cross-sectional view of a pouch film laminate according to one embodiment of the present invention.

[0043] FIG. 3 is a cross-sectional view of a pouch film laminate according to one embodiment of the present invention.

[0044] FIG. 4 is a cross-sectional view of a pouch film laminate according to one embodiment of the present invention.

[0045] FIG. 5 is a plan view of a pouch film laminate according to one embodiment of the present invention.

[0046] FIG. 6 is a perspective view of a pouch film laminate according to one embodiment of the present invention.

[0047] FIG. 7 is a cross-sectional view of a pouch film laminate according to one embodiment of the present invention.

[0048] FIG. 8 is a diagram illustrating a pouch film laminate in which an insulating layer is disposed in the form of a film on a stretching auxiliary layer, unlike the present invention.

[0049] FIG. 9 is an exploded assembly diagram of a secondary battery according to one embodiment of the present invention.

[0050]

[0051]

[0052] The present invention will be described more preferably below.

[0053] Terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0054] The terms used in this invention are used merely to describe exemplary embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise.

[0055] In the present invention, terms such as “comprising,” “having,” or “having” are intended to specify the existence of the implemented features, numbers, steps, components, or combinations thereof, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, components, or combinations thereof.

[0056] In the present invention, the MD direction (Machine Direction) refers to the length direction of the pouch film laminate, and the TD direction (Transverse Direction) refers to the width direction of the pouch film laminate.

[0057]

[0058] As a result of repeated research to improve the insulation, energy density, and maximum molding depth of a pouch-type secondary battery, the inventors discovered that if the outermost layer of a pouch film laminate includes an extension auxiliary layer and a plurality of island portions disposed on the extension auxiliary layer, and the island portions include an insulating material, the insulation of the pouch-type secondary battery can be maintained while improving the energy density and maximum molding depth, and thus completed the present invention.

[0059]

[0060] The present invention will be described in a preferred manner below.

[0061]

[0062] The pouch film laminate, pouch-type battery case, and pouch-type secondary battery according to the present invention comprise at least one of the configurations disclosed below, and may comprise any combination of technically feasible configurations among the configurations below.

[0063]

[0064] Pouch film laminate (1)

[0065] FIGS. 1 to 3 are a cross-sectional view, a plan view, and a perspective view of a pouch film laminate (1) according to an embodiment of the present invention. Hereinafter, each configuration of the pouch film laminate (1) of the present invention will be described in more detail with reference to FIGS. 1 to 3.

[0066]

[0067] A pouch film laminate (1) according to the present invention comprises a sequentially laminated insulating auxiliary layer (10), a gas barrier layer (20), and a sealant layer (30), wherein the insulating auxiliary layer (10) comprises a stretching auxiliary layer (12) and a plurality of island portions (11) disposed on the stretching auxiliary layer (12), and the island portions (11) comprise an insulating material.

[0068]

[0069] In the conventional manufacturing of pouch film laminates, a polyethylene terephthalate (PET) film is placed on the outermost layer of the pouch film laminate to prevent corrosion caused by the external environment and to maintain insulation. However, the polyethylene terephthalate film has a lower elongation at break compared to the polypropylene (PP) film, which is mainly used as a sealant layer, and the nylon film, which is mainly used as a stretching aid layer. Consequently, during the drawing molding of the pouch film laminate, cracks occur in the polyethylene terephthalate film before the polypropylene film or nylon film, or delamination occurs with the stretching aid layer. This results in a reduced maximum molding depth and causes insulation failure.

[0070] To solve the above problem, a method was proposed to thinly apply a coating layer containing an insulating material, rather than a polyethylene terephthalate film, to the outermost layer of the pouch film laminate. However, as with the case of laminating a polyethylene terephthalate film, cracks may form in the coating layer or delamination may occur with the extension auxiliary layer, resulting in a reduced maximum molding depth and problems such as poor insulation and poor appearance.

[0071] Accordingly, to solve the above-mentioned problem, the present invention comprises an insulating auxiliary layer comprising a stretching auxiliary layer and a plurality of island portions disposed on the stretching auxiliary layer on the outermost layer of a pouch film, and intends to include an insulating material in the island portions.

[0072] As shown in FIG. 1, the island portions (11) placed on the stretching auxiliary layer (12) can be spaced apart from each other, unlike the polyethylene terephthalate film or the insulating coating layer (13) having a continuous shape shown in FIG. 8. Therefore, when drawing molding a pouch film laminate including a polyethylene terephthalate film or an insulating coating layer having a continuous shape, problems such as cracking due to stretching or delamination with the stretching auxiliary layer occur. However, since the island portions (11) according to the present invention can be spaced apart from each other, cracking does not occur in the island portions (11), and delamination with the stretching auxiliary layer (12) is prevented, thereby enabling the realization of an excellent maximum molding depth.

[0073] In addition, the island portion can form a spacing distance between other pouch film laminates, and since it includes an insulating material, it can maintain insulation. Furthermore, since the island portion can be formed on the stretching auxiliary layer without an adhesive, it can achieve superior energy density.

[0074]

[0075] Below, each component is explained in more detail.

[0076]

[0077] (1) Insulating auxiliary layer (10)

[0078] An insulating auxiliary layer according to the present invention will be described in more detail with reference to FIGS. 1 to 3.

[0079] The insulating auxiliary layer (10) according to the present invention comprises a stretching auxiliary layer (12) and a plurality of island portions (11) disposed on the stretching auxiliary layer (12), and the island portions (11) comprise an insulating material.

[0080]

[0081] The above insulating auxiliary layer (10) is placed on the outermost layer of the battery case to protect the electrode assembly from external impact and to electrically insulate it, and can assist in the stretching of the pouch film laminate (1) so that it does not easily break when the pouch film laminate (1) is stretched.

[0082]

[0083] According to one embodiment of the present invention, the insulating auxiliary layer (10) may have a thickness of 5 μm to 100 μm, preferably 10 μm to 70 μm, and more preferably 20 μm to 50 μm. The thickness of the insulating auxiliary layer is the thickness of the stretching auxiliary layer (12) and the maximum height (T) of the plurality of island portions (11) disposed on the stretching auxiliary layer (12). I It can be calculated as the sum of ). If the above range is satisfied, excellent insulation can be achieved while realizing excellent maximum forming depth and energy density.

[0084]

[0085] According to one embodiment of the present invention, the insulating auxiliary layer (10) may have a breaking elongation of 50% to 350%, preferably 100% to 300%, and more preferably 150% to 250%. The insulating auxiliary layer has a characteristic in that it includes a plurality of island portions arranged at a spaced distance on the stretching auxiliary layer, so that it can exhibit an excellent breaking elongation similar to the stretching auxiliary layer while maintaining insulation from the height of the island portions and the insulating material included in the island portions. Therefore, when satisfying the above range, an excellent maximum molding depth can be achieved while maintaining insulation.

[0086]

[0087] Hereinafter, the stretching auxiliary layer (12) included in the insulating auxiliary layer (10) and the plurality of island portions (11) disposed on the stretching auxiliary layer (12) are described more preferably.

[0088]

[0089] 1) Extended auxiliary layer (12)

[0090] The above stretching auxiliary layer (12) is included in the insulating auxiliary layer (10) and can perform the role of assisting in the stretching of the pouch film laminate (1).

[0091]

[0092] According to one embodiment of the present invention, the thickness of the stretching auxiliary layer (12) may be 5㎛ to 100㎛, preferably 5㎛ or more, 7㎛ or more, 9㎛ or more, 11㎛ or more, 13㎛ or more, or 15㎛ or more, 100㎛ or less, 80㎛ or less, 60㎛ or less, 50㎛ or less, or 40㎛ or less, and more preferably 15㎛ to 40㎛. When satisfying the above range, excellent moldability of the pouch film laminate can be secured, while preventing a decrease in the energy density relative to volume of the secondary battery due to the excessive thickness of the pouch film laminate.

[0093]

[0094] According to one embodiment of the present invention, the stretching auxiliary layer (12) may include nylon, preferably may include a nylon film, more preferably may include a nylon film selected from the group consisting of nylon 6,6, nylon MXD6 (polyxylylene adipamide), nylon 4, nylon 6, nylon 4,6, and nylon 4,10, and more preferably may include a nylon film including nylon 6. When the above conditions are satisfied, it is desirable in that it can have excellent tensile strength and elongation and excellent chemical resistance.

[0095]

[0096] According to one embodiment of the present invention, the stretching aid layer (12) may include metal oxide particles. The metal oxide particles can remove moisture within the stretching aid layer (12) by reacting with moisture introduced into the stretching aid layer (12) and becoming hydroxylated. The metal oxide particles may include at least four types selected from the group consisting of CaO, MnO, SrO, MgO, and ZnO. Preferably, the metal oxide particles may include at least one of CaO and MgO, which are advantageous for hydroxylation with moisture.

[0097]

[0098] According to one embodiment of the present invention, the stretching aid layer (12) may further include an additive. By including an additive in the stretching aid layer (12), the physical properties of the stretching aid layer (12) can be changed. For example, as an additive for controlling the tensile strength of the stretching aid layer (12), at least one of carbon fiber, glass fiber, and aramid fiber may be added.

[0099]

[0100] 2) Ireland Department (11)

[0101] The above island portion (11) is arranged in a plurality on the above extension auxiliary layer (12), and the island portion (11) includes an insulating material.

[0102] The above island portion (11) is placed on the outermost layer of the pouch film laminate (1) and, when manufactured into a pouch-type secondary battery, can serve to provide insulation while forming a spacing distance between other secondary batteries.

[0103] In addition, as shown in FIG. 8, the insulating layer (13) or polyethylene terephthalate film, which is typically included in the outermost layer of a pouch film laminate, has weak adhesive properties, so after forming an adhesive layer (112), the insulating layer (13) or polyethylene terephthalate film is placed on the adhesive layer (112), which has the disadvantage of increasing the thickness of the pouch film laminate and reducing the energy density. However, the island portion (11) according to the present invention can be formed on the stretching auxiliary layer (12) without an adhesive layer, so it has the characteristic of having excellent energy density.

[0104]

[0105] According to one embodiment of the present invention, the island portion (11) may have a shape that allows it to be spaced apart from other island portions (11), and there are no restrictions on the shape thereof; however, preferably, the plurality of island portions (11) may each independently have one or more shapes among a hemisphere shape and a spherical cap shape. When the above conditions are satisfied, excellent formability, energy density, and processability can be achieved.

[0106]

[0107] According to one embodiment of the present invention, the arrangement of the plurality of island portions (11) is not particularly limited, but a shape that can create a spacing distance between pouch-type secondary batteries manufactured from the pouch film laminate is preferred. For example, the plurality of island portions (11) may each be independently spaced apart. Preferably, the plurality of island portions (11) may be spaced apart with respect to the TD direction of the pouch film laminate (1), and the plurality of island portions (11) may be spaced apart with respect to the MD direction of the pouch film laminate (1).

[0108] Meanwhile, the spacing distance formed by the above-mentioned spaced arrangement does not need to be the same for the multiple island sections (11).

[0109]

[0110] According to one embodiment of the present invention, the plurality of island portions (11) may each be independently spaced apart from one another by 100% to 10000% of the length of the island portion (11), and preferably spaced apart by 100% to 5000%. The length of the island portion (11) may refer to the diameter of a circle equal to the area formed by the contact between the stretching auxiliary layer (12) and the island portion (11), and the spacing distance may refer to the shortest length line connecting the centers of the areas formed by the contact between the stretching auxiliary layer (12) and the island portion (11), excluding the length included in the area. Satisfying the above range may be desirable in terms of achieving excellent molding depth while maintaining insulation.

[0111]

[0112] According to one embodiment of the present invention, the plurality of island portions (11) may be two or more. Preferably, the plurality of island portions (11) may be two or more based on the TD direction of the pouch film laminate (1), and the plurality of island portions (11) may be two or more based on the MD direction of the pouch film laminate (1).

[0113]

[0114] According to one embodiment of the present invention, the plurality of island portions (11) may be arranged independently spaced apart in the TD direction and MD direction of the pouch film laminate (1).

[0115]

[0116] According to one embodiment of the present invention, as shown in FIGS. 4 to 6, the plurality of island portions (11) may be arranged on the stretching auxiliary layer (12) so as to be independently spaced apart in the TD direction and MD direction, respectively, of the pouch film laminate (1). Additionally, for example, the plurality of island portions (11) may be formed on the stretching auxiliary layer (12) as a plurality of dot arrays. When the above conditions are satisfied, it is desirable in that excellent processability can be achieved, excellent moldability and energy density can be realized, and insulation can be maintained.

[0117]

[0118]

[0119] According to one embodiment of the present invention, the plurality of island portions (11) may each be independently spaced apart from each other by 100% to 10000% of the length of the island portion (11) with respect to the MD direction of the pouch film laminate (1), and preferably spaced apart by 100% to 5000%. The length of the island portion (11) may mean the diameter of a circle equal to the area formed by the contact between the stretching auxiliary layer (12) and the island portion (11). The length of the island portion (11) may mean the diameter of a circle equal to the area formed by the contact between the stretching auxiliary layer (12) and the island portion (11), and the spacing distance may mean the amount obtained by subtracting the length included in the area from the shortest length line connecting the centers of the areas formed by the contact between the stretching auxiliary layer (12) and the island portion (11). If the above range is satisfied, it may be desirable in that it can achieve excellent molding depth while maintaining insulation.

[0120]

[0121]

[0122] According to one embodiment of the present invention, the island portion (11) has a maximum height (T IThe thickness may be 100㎛ or less, preferably 0.1㎛ to 100㎛, and more preferably 3㎛ to 50㎛. When the above range is satisfied, it may be desirable in that it can achieve excellent insulation by sufficiently forming a spacing distance between secondary batteries when manufacturing a pouch-type secondary battery, while also achieving an excellent maximum molding depth when stretching the pouch film laminate.

[0123]

[0124] According to one embodiment of the present invention, the insulating material may include one or more selected from the group consisting of polypropylene (PP), SBR (Styrene Butadiene Rubber), NBR (Nitrile-butadiene rubber), urethane rubber, VMQ (silicone rubber), polyvinyl chloride, polyethylene (PE), polyurethane (PU) resin, epoxy resin, glass fiber, and asbestos, and preferably may include one or more selected from the group consisting of polypropylene (PP) and NBR (Nitrile-butadiene rubber). When the above conditions are satisfied, excellent processability and excellent insulating properties may be achieved.

[0125]

[0126] (2) Gas barrier layer

[0127] The gas barrier layer (20) is laminated between the insulating auxiliary layer (10) and the sealant layer (30) to secure the mechanical strength of the pouch, block the entry and exit of gas or moisture from outside the secondary battery, and prevent leakage of electrolyte from inside the pouch-type battery case.

[0128] The thickness of the gas barrier layer (20) may be 20㎛ to 150㎛, preferably 25㎛ to 140㎛, more preferably 25㎛ to 100㎛, even more preferably 30㎛ to 90㎛, and even more preferably 35㎛ to 85㎛. When the above range is satisfied, the moldability of the gas barrier layer is improved, so that when drawing molding the pouch film laminate, the depth of the cup portion can be formed deeply, and accordingly, the volume of the receiving portion increases, so that more electrode assemblies can be laminated in the electrode assembly housed inside, and the energy efficiency relative to volume can be increased. In addition, the manufacturing cost can not be significantly increased, the thickness of the sealant layer can not be reduced, the overall thickness of the pouch can not be significantly increased, and the sealing durability can not be reduced. Furthermore, the remaining amount of the gas barrier layer after pouch molding is appropriate, so the robustness of the pouch can be improved.

[0129] The gas barrier layer (20) may be formed of metal. For example, the gas barrier layer may be a metal thin film comprising one or more metals selected from the group consisting of aluminum (Al), copper (Cu), stainless steel (SUS), nickel (Ni), titanium (Ti), and invar, but is not limited thereto.

[0130] According to one embodiment of the present invention, the gas barrier layer (20) may be formed from an aluminum alloy thin film. When the gas barrier layer (20) is formed using an aluminum alloy thin film, it is possible to secure mechanical strength of a predetermined level or higher, while also ensuring light weight, complementing electrochemical properties of the electrode assembly and electrolyte, and heat dissipation. The aluminum alloy thin film may contain elements other than aluminum (Al). For example, the aluminum alloy thin film may contain one or more selected from the group consisting of iron (Fe), copper (Cu), chromium (Cr), manganese (Mn), nickel (Ni), magnesium (Mg), silicon (Si), and zinc (Zn).

[0131] In another example, the gas barrier layer (20) may be formed from a stainless steel thin film. Preferably, the gas barrier layer (20) may be manufactured by forming and / or processing a stainless steel thin film. The gas barrier layer (20) formed from stainless steel has relatively low thermal conductivity, which is effective in preventing or delaying heat diffusion to other cells during thermal runaway, and has relatively high toughness, which can suppress the occurrence of cracks in the pouch during use of the pouch-type battery. The stainless steel may include one or more elements other than iron (Fe), selected from the group consisting of copper (Cu), chromium (Cr), manganese (Mn), nickel (Ni), magnesium (Mg), silicon (Si), and zinc (Zn).

[0132]

[0133] (3) Sealant layer

[0134] The sealant layer (30) is intended to completely seal the inside of the pouch-type battery case by mutually thermally bonding at the sealing portion when the pouch-type battery case, which accommodates an electrode assembly on the inside, is sealed. To this end, the sealant layer (30) may be formed of a material having excellent thermal bonding strength.

[0135] The sealant layer (30) may be formed from a material having insulating, corrosion-resistant, and sealing properties. Preferably, since the sealant layer (30) comes into direct contact with the electrode assembly and / or electrolyte inside the pouch-type battery case, it may be formed from a material having insulating and corrosion-resistant properties. Additionally, since the sealant layer (30) must completely seal the inside of the pouch-type battery case to block material transfer between the inside and outside, it may be formed from a material having high sealing properties (e.g., excellent thermal sealing strength). To ensure these insulating, corrosion-resistant, and sealing properties, the sealant layer (30) may be formed from a polymer material.

[0136] The sealant layer (30) may be composed of one or more materials selected from the group consisting of polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acrylic polymer, polyacrylonitrile, polyimide, polyamide, cellulose, aramid, nylon, polyester, polyparaphenylenebenzobisoxazole, polyarylate, Teflon, and glass fiber, and preferably may be composed of a polyolefin resin such as polypropylene (PP) and / or polyethylene (PE). In this case, the polypropylene may be composed of cast polypropylene (CPP), acid modified polypropylene (PPA), polypropylene-ethylene copolymer and / or polypropylene-butylene-ethylene terpolymer.

[0137] The thickness of the sealant layer (30) may be 30㎛ to 130㎛, preferably 50㎛ to 120㎛, and more preferably 70㎛ to 100㎛. When the thickness of the sealant layer satisfies the above range, it has the effect of securing the sealing strength of the sealing portion while also securing the moldability of the pouch film laminate.

[0138]

[0139] Meanwhile, the sealant layer (30) according to the present invention may have a single-layer structure made of any one material, and preferably may have a single-layer structure made of polypropylene (PP). Alternatively, the sealant layer (30) may have a composite-layer structure formed by two or more materials forming layers. Preferably, the sealant layer (30) may include a first sealant layer and a second sealant layer. In this case, the first sealant layer may be a layer disposed adjacent to the gas barrier layer, and the second sealant layer may be a layer disposed on the first sealant layer. The first sealant layer and the second sealant layer may each be made of materials with different materials and / or physical properties. An interface may exist between the first sealant layer and the second sealant layer. This means that the first sealant layer and the second sealant layer are different layers and may be formed separately.

[0140] It is particularly preferable that the first sealant layer be made of acid-modified polypropylene (PPa) to ensure long-term adhesion performance between the gas barrier layer and the first sealant layer. Here, the acid-modified polypropylene may be maleic anhydride polypropylene (MAH PP).

[0141] The second sealant layer may be formed from a material having insulating, corrosion-resistant, and sealing properties. Preferably, since the second sealant layer is in direct contact with the electrode assembly (260 in FIG. 9) and / or the electrolyte inside the receiving space (224 in FIG. 9), it may be formed from a material having insulating and corrosion-resistant properties. Additionally, since the second sealant layer must completely seal the inside of the battery case to block material transfer between the inside and outside, it may be formed from a material having high sealing properties. To ensure such insulating, corrosion-resistant, and sealing properties, the second sealant layer may be composed of one or more materials selected from the group consisting of polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acrylic polymer, polyacrylonitrile, polyimide, polyamide, cellulose, aramid, nylon, polyester, polyparaphenylenebenzobisoxazole, polyarylate, Teflon, and glass fiber. Preferably, the second sealant layer may be composed of a polyolefin resin such as polypropylene (PP) and / or polyethylene (PE). In this case, the polypropylene may consist of unoriented polypropylene, acid-modified polypropylene, a polypropylene-ethylene copolymer, and / or a polypropylene-butylene-ethylene terpolymer. Here, the acid-modified polypropylene may be maleic anhydride polypropylene (MAH PP). More preferably, the second sealant layer may include unoriented polypropylene (cast polypropylene, CPP) which has heat sealing properties and high tensile strength.

[0142]

[0143] The pouch film laminate of the present invention described above can be manufactured through a method for manufacturing a pouch film laminate known in the art. For example, the pouch film laminate of the present invention can be manufactured by a method of attaching an insulating auxiliary layer (10) to the upper surface of a gas barrier layer (20) through an adhesive and forming a sealant layer (30) on the lower surface of the gas barrier layer (20) through co-extrusion or an adhesive layer, or by a method such as dry lamination or sandwich lamination. However, the method for manufacturing the pouch film laminate is not limited thereto.

[0144]

[0145] According to one embodiment of the present invention, the pouch film laminate may have a thickness of 120 μm to 300 μm, preferably 130 μm to 280 μm, and more preferably 140 μm to 250 μm. When the thickness of the pouch film laminate satisfies the above range, the molding depth can be increased while minimizing the reduction in the battery receiving space and the decrease in sealing durability caused by the increase in the thickness of the pouch laminate.

[0146]

[0147] An embodiment of the present invention will be described with reference to FIG. 7.

[0148] According to one embodiment of the present invention, the pouch film laminate (1) may further include an adhesive layer (111) between the gas barrier layer (20) and the insulating auxiliary layer (10). For example, the adhesive layer (111) may include a polypropylene-based resin, but is not limited thereto. When the above conditions are satisfied, delamination between the insulating auxiliary layer (10) and the gas barrier layer (20) can be prevented, and excellent moldability can be achieved.

[0149]

[0150] Pouch-type secondary battery

[0151] Next, a pouch-type secondary battery according to the present invention will be described.

[0152] FIG. 9 is an exploded assembly diagram of a pouch-type secondary battery (200) according to the present invention. As shown in FIG. 9, the pouch-type secondary battery (200) of the present invention may include a pouch-type battery case (210), an electrode assembly (260), an electrode lead (280), an insulating part (290), and an electrolyte (not shown).

[0153]

[0154] Hereinafter, each configuration of the pouch-type secondary battery according to the present invention will be described in more detail with reference to FIG. 9.

[0155]

[0156] (1) Pouch-type battery case

[0157] The pouch-type battery case (210) can be manufactured by drawing molding the pouch film laminate of the present invention described above. The pouch-type battery case (210) can accommodate an electrode assembly (260) inside. Since the detailed configuration and physical properties of the pouch film laminate are the same as described above, a detailed description is omitted.

[0158] The pouch film laminate can be drawn and stretched by means of a punch or the like to manufacture a pouch-type battery case (210). As a result, the pouch-type battery case (210) may include a cup portion (222) and a receiving portion (224). The receiving portion (224) is a place for accommodating an electrode assembly and may refer to a receiving space formed in the shape of a pocket inside the cup portion (222) as the cup portion (222) is formed.

[0159]

[0160] According to one embodiment of the present invention, a pouch-type battery case (210) may include a first case (220) and a second case (230) as shown in FIG. 9. The first case (220) includes a receiving portion (224) capable of receiving an electrode assembly (260), and the second case (230) may cover the receiving portion (224) from above so that the electrode assembly (260) does not escape to the outside of the battery case (210). The first case (220) and the second case (230) may be manufactured with one side connected to the other as shown in FIG. 5, but are not limited thereto and may be manufactured in various ways, such as being separated from each other and manufactured separately.

[0161]

[0162] According to another embodiment of the present invention, when forming cup portions in a pouch film laminate, two symmetrical cup portions (222, 232) can be drawn and formed adjacent to each other in a single pouch film laminate. In this case, cup portions (222, 232) can be formed in the first case (220) and the second case (230) respectively, as shown in FIG. 9. After receiving an electrode assembly (260) in a receiving portion (224) provided in the cup portion (222) of the first case (220), a bridge portion (240) formed between the two cup portions (222, 232) can be folded so that the two cup portions (222, 232) face each other. In this case, the cup portion (232) of the second case (230) can receive the electrode assembly (260) from above. Accordingly, since two cup portions (222, 232) accommodate one electrode assembly (260), an electrode assembly (260) with a thicker thickness than when there is only one cup portion (222) can be accommodated. Additionally, since one corner of the secondary battery (200) is formed by folding the pouch-type battery case (210), the number of corners to be sealed can be reduced when performing a sealing process later. Accordingly, the processing speed of the pouch-type secondary battery (200) can be improved and the number of sealing processes can be reduced.

[0163]

[0164] The pouch-type battery case (210) can be sealed while accommodating the electrode assembly (260) so that a part of the electrode lead (280), which will be described later, i.e., the terminal part, is exposed. Preferably, the electrode lead (280) is connected to the electrode tab (270) of the electrode assembly (260), and an insulating part (290) is formed on a part of the electrode lead (280). Then, the electrode assembly (260) is accommodated in the receiving part (224) provided in the cup part (222) of the first case (220), and the second case (230) can cover the receiving part (224) from above. Subsequently, an electrolyte is injected into the interior of the receiving part (224), and the sealing part (250) formed on the edges of the first case (220) and the second case (230) can be sealed.

[0165] The sealing portion (250) can perform the function of sealing the receiving portion (224). Preferably, the sealing portion (250) can seal the receiving portion (224) by being formed along the edge of the receiving portion (224). The temperature at which the sealing portion (250) is sealed may be 180°C to 250°C, preferably 200°C to 250°C, and more preferably 210°C to 240°C. When the sealing temperature satisfies the above numerical range, the pouch-type battery case (210) can secure sufficient sealing strength by thermal bonding.

[0166]

[0167] (2) Electrode assembly

[0168] The electrode assembly (260) can be inserted into a pouch-type battery case (210) and sealed by the pouch-type battery case (210) after the electrolyte is injected.

[0169] The electrode assembly (260) may be formed by sequentially stacking an anode, a separator, and a cathode. Preferably, the electrode assembly (260) may include two types of electrodes, an anode and a cathode, and a separator interposed between the electrodes to insulate them from one another.

[0170] The positive and negative electrodes may each have a structure in which an active material slurry is coated onto an electrode current collector in the form of a metal foil or metal mesh containing aluminum and copper. The slurry can typically be formed by stirring granular active material, an auxiliary conductor, a binder, and a conductive material with added solvent. The solvent can be removed in a subsequent process.

[0171] An electrode assembly (260) can be manufactured in a predetermined shape by applying a slurry, which is a mixture of an electrode active material and a binder and / or a conductive material, to an anode current collector and a cathode current collector to manufacture an anode and a cathode, and stacking them on both sides of a separator. The types of electrode assemblies (260) may include stack type, jelly roll type, stack and folding type, etc., but are not limited thereto.

[0172] The electrode assembly (260) may include an electrode tab (270).

[0173] The electrode tab (270) is connected to the positive and negative electrodes of the electrode assembly (260), respectively, and protrudes outward from the electrode assembly (260), serving as a path for electrons to move between the inside and outside of the electrode assembly (260). The electrode current collector included in the electrode assembly (260) may be composed of a portion coated with an electrode active material and a terminal portion not coated with an electrode active material, i.e., a non-coated portion. The electrode tab (270) may be formed by cutting the non-coated portion or by connecting a separate conductive member to the non-coated portion using ultrasonic welding or the like. As shown in FIG. 9, the electrode tab (270) may protrude in different directions from the electrode assembly (260), but is not limited thereto and may be formed to protrude in various directions, such as protruding in parallel from one side in the same direction.

[0174]

[0175] (3) Electrode lead

[0176] The electrode lead (280) can supply electricity to the outside of the secondary battery (200). The electrode lead (280) can be connected to the electrode tab (270) of the electrode assembly (260) by spot welding or the like.

[0177] The electrode lead (280) is connected to the electrode assembly (260) and can protrude outside the pouch-type battery case (210) via the sealing portion (250). Preferably, one end of the electrode lead (280) is connected to the electrode assembly (260), specifically the electrode tab (270), and the other end of the electrode lead (280) can protrude outside the pouch-type battery case (210).

[0178] The electrode lead (280) may include a positive lead (282) that has one end connected to a positive tab (272) and extends in the direction in which the positive tab (272) protrudes, and a negative lead (284) that has one end connected to a negative tab (271) and extends in the direction in which the negative tab (271) protrudes. Both the positive lead (282) and the negative lead (284) may have their other ends protruding to the outside of the battery case (210). Thus, electricity generated inside the electrode assembly (260) can be supplied to the outside. Additionally, since the positive tab (272) and the negative tab (271) are formed to protrude in various directions, the positive lead (282) and the negative lead (284) may also extend in various directions. The positive lead (282) and the negative lead (284) may have different materials. That is, the positive lead (282) is made of the same aluminum (Al) material as the positive current collector, and the negative lead (284) may be made of the same copper (Cu) material as the negative current collector or a copper material coated with nickel (Ni). A portion of the electrode lead (280) protruding outside the battery case (210) can be a terminal portion and electrically connected to an external terminal.

[0179]

[0180] (4) Insulating part

[0181] The insulating part (290) prevents electricity generated from the electrode assembly (260) from flowing to the battery case (210) through the electrode lead (280) and can maintain the sealing of the battery case (210). To this end, the insulating part (290) may be formed of a non-conductive insulating material that does not conduct electricity well. Generally, the insulating part (290) is often made of insulating tape or film that is easy to attach to the electrode lead (280) and has a relatively thin thickness, but is not limited thereto, and any material capable of insulating the electrode lead (280) may be used.

[0182] The insulating portion (290) may be positioned to surround the outer surface of the electrode lead (280). Preferably, at least a portion of the electrode lead (280) may be surrounded by the insulating portion (290). In this case, the insulating portion (290) may be positioned between the electrode lead (280) and the pouch-type battery case (210). The insulating portion (290) may be located in a sealing portion (250) where the first case (220) and the second case (230) of the pouch-type battery case (210) are heat-fused, and the electrode lead (280) may be bonded to the battery case (210).

[0183]

[0184] (5) Electrolyte

[0185] The pouch-type secondary battery (200) according to the present invention may further include an electrolyte (not shown) injected into the inside of the pouch-type battery case (210). The electrolyte is intended to move lithium ions generated by the electrochemical reaction of the electrodes during charging / discharging of the secondary battery (200), and may include a non-aqueous organic electrolyte, which is a mixture of a lithium salt and an organic solvent, or a polymer using a polymer electrolyte. Furthermore, the electrolyte may include a sulfide-based, oxide-based, or polymer-based solid electrolyte, and such a solid electrolyte may have flexibility that allows it to be easily deformed by an external force.

[0186]

[0187] The present invention is described more preferably below through specific embodiments. However, the following embodiments are merely examples to aid in understanding the invention and do not limit the scope of the invention. It is obvious to those skilled in the art that various changes and modifications are possible within the scope and spirit of this description, and it is natural that such variations and modifications fall within the scope of the appended claims.

[0188]

[0189] Examples and Comparative Examples

[0190] Example 1: Preparation of a pouch film laminate

[0191] A nylon film with a thickness of 15 μm is prepared as a stretching auxiliary layer, and an island portion (maximum height (T)) comprising an insulating material (polypropylene (PP) and NBR (Nitrile-butadiene rubber) as shown in FIG. 4 is prepared on the stretching auxiliary layer. I An insulating auxiliary layer was prepared by forming a thickness of 50㎛).

[0192] After that, the above insulating auxiliary layer, an aluminum alloy thin film with a thickness of 40 μm as a gas barrier layer, and a polypropylene (PP) with a thickness of 80 μm as a sealant layer were sequentially laminated to manufacture a pouch film laminate in which an island portion / an extended auxiliary layer / a gas barrier layer / a sealant layer were sequentially laminated.

[0193]

[0194] Example 2: Preparation of a pouch film laminate

[0195] A pouch film laminate was manufactured in the same manner as in Example 1, except that a nylon film with a thickness of 25 μm was used as the stretching auxiliary layer and an aluminum alloy thin film with a thickness of 60 μm was used as the gas barrier layer.

[0196]

[0197] Example 3: Preparation of a pouch film laminate

[0198] A pouch film laminate was manufactured in the same manner as in Example 1, except that a nylon film with a thickness of 25 μm was used as the stretching auxiliary layer and an aluminum alloy thin film with a thickness of 80 μm was used as the gas barrier layer.

[0199]

[0200] Comparative Example 1: Preparation of a pouch film laminate

[0201] An insulating auxiliary layer was prepared by preparing a nylon film with a thickness of 15 μm as an extended auxiliary layer and laminating a polyethylene terephthalate (PET) film with a thickness of 12 μm on the extended auxiliary layer.

[0202] Subsequently, the above insulating auxiliary layer, an aluminum alloy thin film with a thickness of 40 μm as a gas barrier layer, and a polypropylene (PP) with a thickness of 80 μm as a sealant layer were sequentially laminated to produce a pouch film laminate in which a polyethylene terephthalate film / an extended auxiliary layer / a gas barrier layer / a sealant layer were sequentially laminated.

[0203]

[0204] Comparative Example 2: Preparation of a pouch film laminate

[0205] A pouch film laminate was manufactured in the same manner as Comparative Example 1, except that a nylon film with a thickness of 25 μm was used as the stretching auxiliary layer and an aluminum alloy thin film with a thickness of 60 μm was used as the gas barrier layer.

[0206]

[0207] Comparative Example 3: Preparation of a pouch film laminate

[0208] A pouch film laminate was manufactured in the same manner as Comparative Example 1, except that a nylon film with a thickness of 25 μm was used as the stretching auxiliary layer and an aluminum alloy thin film with a thickness of 80 μm was used as the gas barrier layer.

[0209]

[0210] Comparative Example 4: Preparation of a pouch film laminate

[0211] An insulating auxiliary layer was prepared by preparing a nylon film with a thickness of 15 μm as an extended auxiliary layer, applying a coating solution containing polypropylene (PP) and NBR (Nitrile-butadiene rubber) onto the extended auxiliary layer, and then drying to form an insulating layer with a thickness of 5 μm.

[0212] After that, the above insulating auxiliary layer, an aluminum alloy thin film with a thickness of 40 μm as a gas barrier layer, and a polypropylene (PP) with a thickness of 80 μm as a sealant layer were sequentially laminated to manufacture a pouch film laminate in which the insulating layer / stretching auxiliary layer / gas barrier layer / sealant layer were sequentially laminated.

[0213]

[0214] Comparative Example 5: Preparation of a pouch film laminate

[0215] A pouch film laminate was manufactured in the same manner as Comparative Example 4, except that a nylon film with a thickness of 25 μm was used as the stretching auxiliary layer and an insulating layer with a thickness of 10 μm was formed to prepare an insulating auxiliary layer, and an aluminum alloy thin film with a thickness of 60 μm was used as the gas barrier layer.

[0216]

[0217] Comparative Example 6: Preparation of a pouch film laminate

[0218] A pouch film laminate was manufactured in the same manner as Comparative Example 4, except that a nylon film with a thickness of 25 μm was used as the stretching auxiliary layer and an insulating layer with a thickness of 10 μm was formed to prepare an insulating auxiliary layer, and an aluminum alloy thin film with a thickness of 80 μm was used as the gas barrier layer.

[0219]

[0220] The above examples and comparative examples are summarized and shown in Table 1 below.

[0221] Insulating auxiliary layer, gas barrier layer, sealant layer, stretched auxiliary layer, upper stretched auxiliary layer, shape, material thickness, or maximum height (T I) (㎛) Thickness (㎛) Thickness (㎛) Thickness (㎛) Example 1 Ireland PP, NBR 50 154080 Example 2 Ireland PP, NBR 50 256080 Example 3 Ireland PP, NBR 50 258080 Comparative Example 1 Film PET 12154080 Comparative Example 2 Film PET 12256080 Comparative Example 3 Film PET 12258080 Comparative Example 4 Coated PP, NBR 5154080 Comparative Example 5 Coated PP, NBR 10256080 Comparative Example 6 Coated PP, NBR 10258080

[0222] Experimental Example 1: Measurement of Breaking Elongation of Insulating Auxiliary Layer

[0223] The elongation at break of each insulating auxiliary layer prepared in Examples 1 to 3 and Comparative Examples 1 to 6 was measured.

[0224] Specifically, the insulating auxiliary layers prepared in Examples 1 to 3 and Comparative Examples 1 to 6 were cut to a size of 15 mm (TD direction) × 150 mm (MD direction), and the elongation at break was measured using a tester (UTM equipment from ZwickRoell). After measuring the length at the time of break, the elongation at break was calculated for each sample by multiplying (length at the time of break - length of initial sample) / (length of initial sample) by 100. At this time, measurements were taken 10 times at a tensile speed of 80 mm / min, and the results were expressed as the average.

[0225] The measured elongation at break is shown in Table 2 below.

[0226]

[0227] Elongation at Break (%) Example 1 140 Example 2 145 Example 3 145 Comparative Example 170 Comparative Example 270 Comparative Example 370 Comparative Example 4 120 Comparative Example 5 130 Comparative Example 6 130

[0228] Referring to Table 2 above, it can be seen that in the case of Examples 1 to 3, the elongation at break of the insulating auxiliary layer is superior compared to Comparative Examples 1 to 6.

[0229]

[0230] Experimental Example 2: Evaluation of Pouch Film Laminate Formability (Maximum Forming Depth)

[0231] The moldability (maximum molding depth) of each pouch film laminate according to Examples 1 to 3 and Comparative Examples 1 to 6 was evaluated.

[0232] More specifically, as a method for evaluating the formability of a pouch film laminate, the pouch film laminates were each cut to the same size of 300mm (MD direction) × 400mm (TD direction), and then the forming depth was varied in a battery case forming device having two forming sections of 90mm (MD direction) × 160mm (TD direction) to find the forming depth at which a crack occurs, and then the depth was lowered by 0.5mm from that depth and confirmed to be free of defects after 10 forming cycles, and that depth was measured as the maximum forming depth.

[0233] Here, the punch and forming section of the battery case forming device were filleted at the corners and edges, and the corners of the punch had a curvature of 2 mm and the edges had a curvature of 0.5 mm, while the corners of the forming section had a curvature of 2.0 mm and the edges had a curvature of 1 mm. Also, the clearance between the punch and the forming section was 0.5 mm.

[0234] The maximum forming depth measured above is shown in Tables 3 to 5 below.

[0235]

[0236] Experimental Example 3: Measurement of elongation at break of pouch film laminate

[0237] The elongation at break of each pouch film laminate according to Examples 1 to 3 and Comparative Examples 1 to 6 was measured.

[0238] Specifically, the pouch film laminates prepared in Examples 1 to 3 and Comparative Examples 1 to 6 were cut to a size of 15 mm (TD direction) × 150 mm (MD direction), and the elongation at break was measured using a testing machine (UTM equipment from ZwickRoell). After measuring the length at the time of break, the elongation at break was calculated for each sample by multiplying (length at the time of break - length of initial sample) / (length of initial sample) by 100. At this time, measurements were taken 10 times at a tensile speed of 80 mm / min, and the results were expressed as the average.

[0239]

[0240] Elongation at Break (%) Maximum Forming Depth (mm) Example 1 1008 Comparative Example 1 705.5 Comparative Example 4 857

[0241] Referring to Table 3 above, it can be seen that when the thickness of the gas barrier layer is 40 μm, in the case of Example 1 where the shape of the insulating material placed on the upper part of the stretching auxiliary layer is an island, the elongation at break and maximum forming depth of the pouch film laminate are superior compared to Comparative Examples 1 and 4, where the shape of the upper part of the stretching auxiliary layer is a PET film or an insulating material coating layer.

[0242]

[0243] Elongation at Break (%) Maximum Forming Depth (mm) Example 213011 Comparative Example 2807 Comparative Example 51009

[0244] Referring to Table 4 above, it can be seen that when the thickness of the gas barrier layer is 60 μm, in the case of Example 2 where the shape of the insulating material placed on the upper part of the stretching auxiliary layer is an island, the elongation at break and maximum forming depth of the pouch film laminate are superior compared to Comparative Examples 2 and 5, where the shape of the upper part of the stretching auxiliary layer is a PET film or an insulating material coating layer.

[0245]

[0246] Elongation at Break (%) Maximum Forming Depth (mm) Example 3 140 15 Comparative Example 380 11 Comparative Example 6 110 12

[0247] Referring to Table 5 above, it can be seen that when the thickness of the gas barrier layer is 80 μm, in the case of Example 3 where the shape of the insulating material placed on the upper part of the stretching auxiliary layer is an island, the elongation at break and maximum forming depth of the pouch film laminate are superior compared to Comparative Examples 3 and 6, where the shape of the upper part of the stretching auxiliary layer is a PET film or an insulating material coating layer.

[0248]

[0249] [Explanation of the symbol]

[0250] 1: Pouch film laminate

[0251] 10: Insulating auxiliary layer

[0252] 11: Ireland

[0253] 12: Extended auxiliary layer

[0254] 13: Insulating layer

[0255] 20: Gas barrier layer

[0256] 30: Sealant layer

[0257] 111: Adhesive layer

[0258] 112: Adhesive layer

[0259] 200: Pouch-type secondary battery

[0260] 210: Pouch-type case

[0261] 220: First case

[0262] 222: Cups

[0263] 224: Reception Department

[0264] 230: Second case

[0265] 232: Cups

[0266] 240: Bridge section

[0267] 250: Sealing part

[0268] 260: Electrode assembly

[0269] 270: Electrode tab

[0270] 272: Positive tab

[0271] 274: Cathode tab

[0272] 280: Electrode Lead

[0273] 282: Positive lead

[0274] 284: Cathode Lead

[0275] 290: Insulation part

Claims

1. A pouch film laminate comprising a sequentially laminated insulating auxiliary layer, a gas barrier layer, and a sealant layer, The insulating auxiliary layer comprises an extended auxiliary layer and a plurality of island portions disposed on the extended auxiliary layer, and The above-mentioned island portion is a pouch film laminate comprising an insulating material.

2. In Claim 1, The above insulating auxiliary layer is a pouch film laminate having a thickness of 5㎛ to 100㎛.

3. In Claim 1, The above insulating auxiliary layer is a pouch film laminate having a break elongation of 50% to 350%.

4. In Claim 1, The above-mentioned stretching auxiliary layer is a pouch film laminate having a thickness of 5㎛ to 100㎛.

5. In Claim 1, The above-mentioned stretching auxiliary layer comprises a pouch film laminate including nylon.

6. In Claim 1, A pouch film laminate in which the above plurality of island sections are each independently spaced apart.

7. In Claim 1, The above island section has a maximum height (T I A pouch film laminate having a thickness of 100㎛ or less.

8. In Claim 1, The above insulating material comprises one or more selected from the group consisting of polypropylene (PP), SBR (Styrene Butadiene Rubber), NBR (Nitrile-butadiene rubber), urethane rubber, VMQ (silicone rubber), polyvinyl chloride, polyethylene (PE), polyurethane (PU) resin, epoxy resin, glass fiber, and asbestos, forming a pouch film laminate.

9. In Claim 1, The above gas barrier layer is a pouch film laminate having a thickness of 20㎛ to 150㎛.

10. In Claim 1, The above sealant layer is a pouch film laminate having a thickness of 30㎛ to 130㎛.

11. In Claim 1, The above pouch film laminate is a pouch film laminate having a thickness of 120㎛ to 300㎛.

12. In Claim 1, The above pouch film laminate further comprises an adhesive layer between the gas barrier layer and the insulating auxiliary layer.

13. A pouch-type battery case manufactured by drawing molding the pouch film laminate of Claim 1.

14. A pouch-type secondary battery comprising the pouch-type battery case of claim 13.

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