WO2020175777A1 - 이차전지용 외장재 및 그 외장재를 포함하는 이차전지 - Google Patents

이차전지용 외장재 및 그 외장재를 포함하는 이차전지 Download PDF

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Publication number
WO2020175777A1
WO2020175777A1 PCT/KR2019/017572 KR2019017572W WO2020175777A1 WO 2020175777 A1 WO2020175777 A1 WO 2020175777A1 KR 2019017572 W KR2019017572 W KR 2019017572W WO 2020175777 A1 WO2020175777 A1 WO 2020175777A1
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Prior art keywords
layer
metal
secondary battery
metal part
exterior material
Prior art date
Application number
PCT/KR2019/017572
Other languages
English (en)
French (fr)
Inventor
정범영
Original Assignee
주식회사 엘지화학
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Filing date
Publication date
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN201980018092.7A priority Critical patent/CN111867826B/zh
Priority to JP2020546109A priority patent/JP7048843B2/ja
Priority to US16/982,834 priority patent/US20210057682A1/en
Priority to EP19917286.7A priority patent/EP3753729A4/en
Publication of WO2020175777A1 publication Critical patent/WO2020175777A1/ko

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/027—Thermal properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/03—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers with respect to the orientation of features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H01M50/143—Fireproof; Explosion-proof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/206—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/302—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/10—Batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

Definitions

  • secondary battery including exterior materials for secondary batteries and exterior materials
  • the present invention relates to exterior materials for secondary batteries and secondary batteries including exterior materials.
  • a secondary battery including an exterior material for secondary batteries and other exterior materials that have a structure capable of solving the ignition problem of the secondary battery while improving corrosion resistance to the electrolyte.
  • Secondary batteries capable of repetitive heavy charging and discharging can be classified into cylindrical secondary batteries, square secondary batteries, pouch-type secondary batteries, etc., depending on their structure or manufacturing method.
  • Double-pouch-type secondary batteries are in the form of sheets. It is common to have a structure in which an electrode assembly having a structure in which electrodes and separators are alternately arranged in the pouch exterior material of the pouch has a structure.
  • the pouch-type secondary battery is widely used because the process required for manufacturing is relatively simple and the manufacturing cost is low.
  • a sheet-shaped pouch is composed of a plurality of layers made of different materials.
  • the pouch generally includes an aluminum layer, but the inner surface of the aluminum layer is penetrated by an electrolyte solution and moisture.
  • An insulating layer is provided to prevent the aluminum layer from being electrically connected to the positive or negative electrode, thereby preventing the aluminum layer from becoming polar.
  • Corrosion causes cracks in the aluminum layer, causing damage to the pouch.
  • the problem to be solved by this invention is in the process of using the secondary battery. This is to minimize the problem of damage to the exterior material that may occur due to the reaction between the electrolyte and the exterior material.
  • the problem to be solved by the present invention is to minimize the problem of damage to the aluminum layer that may occur when the aluminum layer becomes polar due to damage to the insulating layer.
  • a flame retardant material may be mixed in the first adhesive portion.
  • the first metal part or the second metal part may be made of a clad material.
  • the flame-retardant material may include at least one of a phosphorus compound, a nitrogen compound, a halogen compound, an antimony compound, a molybdenum compound, a zinc borate compound, and a metal hydroxide.
  • An insulating portion having an insulating property; And a second adhesive portion provided between the first metal portion and the insulating portion, each of which is adhered to the first metal portion and the insulating portion; may further include.
  • the first metal part includes, a first layer containing a first material; and a second layer containing a second material, wherein the first layer is provided closer to the inner space than the second layer And, the thermal conductivity of the first layer may be greater than the thermal conductivity of the second layer.
  • the second metal part includes a third layer including a third material; and a fourth layer including a fourth material, wherein the third layer is provided closer to the inner space than the fourth layer And, the thermal conductivity of the third layer may be greater than the thermal conductivity of the fourth layer.
  • the first material may contain copper, and the second material may contain aluminum.
  • the third material may contain copper, and the fourth material may contain aluminum.
  • the first adhesive portion and the second adhesive portion are made of PPa (acid modified polypropylene).
  • the insulating portion may include CPP (cast polypropylene).
  • 0-nylon (oriented nylon) may be included, and the second outer surface may include PET (polyethylene tereph lalate).
  • the secondary battery comprising an exterior material for the secondary battery receiving the electrode assembly WO 2020/175777 PCT/KR2019/017572 is provided.
  • Figure 1 is an enlarged view of the layered structure of an exterior material for a secondary battery according to the present invention
  • FIG. 2 is a cross-sectional view showing an enlarged layered structure of a first metal part in the exterior material for a secondary battery according to the present invention.
  • FIG 3 is an enlarged cross-sectional view showing a layered structure of a second metal part in an exterior material for a secondary battery according to the present invention.
  • FIG. 4 is a cross-sectional view showing an initial appearance when a first metal part and an electrolyte meet and react in the exterior material for a secondary battery according to the present invention.
  • FIG. 5 is a cross-sectional view showing a later appearance when the first metal part and the electrolyte reacted with each other in the exterior material for a secondary battery according to the present invention.
  • FIG. 1 is an enlarged view of the layered structure of an exterior material for a secondary battery according to the present invention
  • the exterior material 10 may be a sheet-like exterior material having a thin thickness.
  • the exterior material 10 includes an interior space.
  • the inner space may be a space in which an electrode assembly composed of an electrode and a separator is accommodated.
  • the exterior material 10 according to the present invention may be an exterior material used for a pouch-type secondary battery.
  • the exterior material 10 may include a first metal part 100 and a second metal part 200 spaced apart from the first metal part 100.
  • a first adhesive portion 300 may be provided, each of which is adhered to the metal portion 200.
  • the first adhesive portion 300 may include acid modified polypropylene (PPa).
  • PPa It can mean a material having a structure in which maleic acid is grafted to polypropylene.
  • an interior space can be formed in the exterior material (10).
  • the metal part 100 may be provided adjacent to the inner space than the second metal part 200.
  • the exterior material 10 according to the present invention is provided by being spaced apart from the first metal part 100 in the direction of the interior space of the exterior material 10, but the insulation part 400 having electrical insulation, and the first metal part 100 )
  • the insulating portion 400 may further include a second adhesive portion 500 provided between the first adhesive portion 300.
  • the second adhesive portion 500 includes the first metal portion 100 and the insulating portion ( 400) may be a configuration to prevent relative movement of the liver. Therefore, the second bonding portion 500 may be bonded to each of the first metal portion 100 and the insulating portion 400.
  • the second bonding portion 500 is also PPa (acid modified polypropylene).
  • the insulating portion 400 may include cast polypropylene (CPP). Alternatively, the insulating portion 400 may be made of all types.
  • the exterior material 10 includes a first outer surface part 600 laminated on the outer surface of the second metal part 200, and a first outer surface part 600. It may further include a second outer surface portion 700 laminated on the outer surface of the second metal portion and the term'outer surface of the second metal portion and the outer surface of the first outer surface portion' refers to both surfaces of the second metal portion and the first outer surface portion (Fig. 1). It can be seen as meaning the inner space formed in the upper and lower surfaces) and the invisible surface (the upper surface based on Fig. 1).
  • the first outer surface 600 is 0-nylon (oriented nylon (oriented nylon)).
  • the second outer surface portion 700 may include PET (polyethylene terephthalate).
  • the first outer surface portion 600 may be formed of O-nylon, and the second outer surface portion 700 may be It can be done with PET.
  • the thermal conductivity of the first metal part 100 is
  • the thickness of the first metal part 100 and the thickness of the second metal part 200 may be the same. Further, the thickness of the first metal part 100 and the second metal part 200 May be selected according to the elongation of the first metal part 100 and the second metal part 200, and the depth at which the cup is formed in the process of forming a cup on the exterior material by pressing a portion of the exterior material.
  • a potential may be formed in the metal part inside the exterior material during the operation of the secondary battery.
  • a potential may be formed in the metal part by electrically connecting the metal part inside the exterior material with the electrode assembly.
  • the metal part in the exterior material 10 is divided into a first metal part 100 and a second metal part 200, and the first metal part 100 and the second metal part 200 are separated from each other. Therefore, when a crack occurs in the insulating portion 400, even if a crack occurs in the first metal portion 100 that first meets with the electrolyte, the crack can be prevented from spreading to the second metal portion 200. Accordingly, according to the present invention, it is possible to prevent the crack from spreading to the entire area of the metal part of the exterior material 10, so that damage to the exterior material 10 can be minimized. That is, according to the present invention, as shown in FIG.
  • the temperature inside the secondary battery may increase due to overcharging, an internal short circuit, or continuous use for a long time.
  • heat dissipation needs to occur more rapidly in the area adjacent to the electrode assembly where heat is generated. This is because if the heat dissipation does not occur rapidly in the area adjacent to the electrode assembly, the temperature of the electrode assembly continues to rise, causing a problem such as explosion of the secondary battery.
  • the thermal conductivity of the first metal portion 100 provided in the region is larger than that of the second metal portion 200 provided in a region relatively far from the electrode assembly, heat can be released more rapidly in the region adjacent to the electrode assembly. Therefore, it is possible to solve the safety problem of the secondary battery that may occur when the temperature of the electrode assembly continues to rise.
  • the first bonding portion 300 of the exterior material 10 may include a flame retardant material.
  • the first bonding portion 300 may contain flame retardant properties. Materials may be mixed. Therefore, according to the present invention, even if a fire occurs inside the secondary battery, the fire can be prevented from spreading to the outside of the secondary battery by the flame-retardant material mixed in the first adhesive part 300.
  • Flame retardant material It may include at least one of a phosphorus compound, a nitrogen compound, a halogen compound, an antimony compound, a molybdenum compound, a zinc borate compound, and a metal hydroxide.
  • the principle of suppressing combustion by consuming energy (ii) the principle of forming a protective film after condensing a combustible material into a solid or gas so that it cannot come into contact with the flammable material, and (iii) a extinguishing action by generating a non-combustible gas during combustion.
  • Examples include principles, (iv) the principle of inhibiting radical absorption reactions in the radical chain reaction in combustion reactions.
  • the (ii) principle can be carried out by a phosphorus compound, the (iii) principle can be carried out by a metal hydroxide or an antimony compound, and the (iv) principle can be carried out by a halogen-based compound.
  • the first metal part 100 of the exterior material 10 may be made of a single metal, but according to another embodiment of the present invention, unlike the first metal part 100, the first metal part 100 is made of different materials. It can also consist of multiple layers.
  • Figure 2 is a cross-sectional view showing an enlarged layered structure of the first metal part in the exterior material for a secondary battery according to the present invention.
  • the first metal portion 100 may include a first layer 110 and a second layer 120.
  • Second layer 120 When compared to ), the first floor (no) may be a floor provided relatively adjacent to the inner space of the exterior material (10). At this time, the thermal conductivity of the first layer (no) may be greater than the thermal conductivity of the second layer (120).
  • FIG 3 is an enlarged cross-sectional view showing a layered structure of a second metal part in an exterior material for a secondary battery according to the present invention.
  • the metal part 200 may also have a layered structure, that is, the second metal part 200 may include a third layer (2W) and a fourth layer 220.
  • the third The layer 210 may be a layer provided relatively adjacent to the inner space of the exterior material 10. At this time, the thermal conductivity of the third layer 2W may be greater than that of the fourth layer 220.
  • the first layer 110 of the first metal portion 100 may contain a first material, and the second
  • Layer 120 may contain a second material. Further, the third layer 210 of the second metal portion 200 may contain a third material, and the fourth layer 220 may contain a fourth material. 2020/175777 1»(:1 ⁇ 1 ⁇ 2019/017572
  • the thermal conductivity of the first layer (0) may be greater than the thermal conductivity of the second layer (120), and the thermal conductivity of the third layer (210) may be greater than that of the fourth layer (220).
  • the thermal conductivity of the first material may be greater than that of the second material, and the thermal conductivity of the third material may be greater than that of the fourth material.
  • the first and third substances may contain copper
  • the second and fourth substances may contain aluminum
  • the first and third substances may be made of copper
  • the second material and the fourth material may be made of aluminum
  • Copper has about 1.5 times higher thermal conductivity than aluminum. Therefore, compared to the second layer (120), compared to the first layer (0) and the fourth layer (220) provided adjacent to the electrode assembly. As a result, when the third layer (0) adjacent to the electrode assembly contains or is made of copper, the heat inside the secondary battery can be released to the outside more quickly.
  • the first metal part 100 or the second metal part 200 may be made of a clad (( ⁇ (1) material.
  • This clad is a material that can show the advantages of each metal by joining two or more metals, and the joining between two or more metals in the clad can be made by rolling ( « can be made by blank.
  • the first layer of the first metal part (100) (0) ) And the second layer 120 are made of copper and aluminum, respectively, the first metal part 100 made of a clad material can be manufactured due to the bonding by rolling between copper and aluminum.
  • the second metal part 200 can be manufactured.
  • the third layer (0) and the fourth layer (220) of a) are copper and aluminum, respectively, a second metal part 200 made of a clad material may be manufactured due to the bonding by rolling between copper and aluminum. The same can be applied when the fourth layer is made of other metals.
  • the secondary battery according to the present invention may include an electrode assembly having a structure in which an electrode and a separator are alternately disposed, and an exterior material for a secondary battery receiving the electrode assembly.
  • the description of the exterior material for secondary batteries is replaced with the above.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

이차전지용 외장재 및 이차전지가 개시된다. 본 발명의 일 측면에 따르면, 내부 공간이 형성된 이차전지용 외장재로서, 제1 금속부, 및 상기 제1 금속부와 이격되어 있는 제2 금속부를 포함하되, 상기 제1 금속부는 상기 제2 금속부보다 상기 내부 공간에 인접하게 구비되고, 상기 제1 금속부의 열전도율은 상기 제2 금속부의 열전도율보다 큰 이차전지용 외장재가 제공된다.

Description

명세서
발명의명칭:이차전지용외장재및그외장재를포함하는 이차전지
기술분야
[1] 과려츰워과의상호이용
四 본출원은 2019년 2월 27일자한국특허출원제 10-2019-0023122호에기초한 우선권의이익을주장하며,해당한국특허출원의문헌에개시된모든내용은본 명세서의일부로서포함된다.
[3] 기숨분야
[4] 본발명은이차전지용외장재및그외장재를포함하는이차전지에관한
것으로,보다상세하게는,전해액에대한내부식성이향상되면서도이차전지의 발화문제를해결할수있는구조를갖는이차전지용외장재및그외장재를 포함하는이차전지에관한것이다.
배경기술
[5] 반복적인중전및방전이가능한이차전지 (secondary battery)는그구조또는 제조방법에따라원통형이차전지,각형이차전지,파우치형이차전지등으로 구분될수있다.이중,파우치형이차전지는시트형태의파우치외장재내에 전극과분리막이교대로배치된구조를갖는전극조립체가수용된구조를갖는 것이일반적이다.특히,파우치형이차전지는제조에필요한공정이비교적 간단하고제조비용이낮아널리사용되고있다.
[6] 한편,종래기술에따르면시트형태의파우치는서로다른물질로이루어진 복수의층으로구성된다.특히,파우치는알루미늄층을포함하는것이 일반적인데,알루미늄층의내측면에는전해액과수분의침투를방지하기위한 절연층이구비된다.이러한절연층은알루미늄층이양극또는음극과 전기적으로연결되지않도록함으로써평상시에알루미늄층이극성을띠지 않도록하는역할을수행한다.
[7] 그러나,종래기술에따르면이차전지의제조또는사용과정에서절연층이 손상되는경우손상된름사이로전해액과수분등이알루미늄층으로침투하게 되어알루미늄층이손상되는문제가발생하였다.특히 ,리튬이차전지에서 절연층이손상되는경우전해액이알루미늄층으로침투하는과정에서전해액 내의리튬이온이알루미늄층과반응하여알루미늄층이산화또는
부식됨으로써알루미늄층에균열이발생하게되어,파우치의손상이발생하는 문제점이 있었다.
발명의상세한설명
기술적과제
[8] 따라서 ,본발명이해결하고자하는과제는,이차전지의사용과정에서 전해액과외장재간의반응에의해발생할수있는외장재의손상문제를 최소화하는것이다.
[9] 특히 ,본발명이해결하고자하는과제는,절연층의손상으로알루미늄층이 극성을띠게되는경우발생할수있는알루미늄층의손상문제를최소화하는 것이다.
과제해결수단
[1이 상기목적을달성하기위한본발명의일측면에따르면,내부공간이형성된 이차전지용외장재로서 ,제 1금속부;상기제 1금속부와이격되어 있는제 2 금속부;및상기제 1금속부와상기제 2금속부사이에구비되고,상기제 1 금속부와상기제 2금속부에각각접착되는제 1접착부;를포함하고,상기제 1 금속부는상기제 2금속부보다상기내부공간에인접하게구비되고,상기제 1 금속부의열전도율은상기제 2금속부의열전도율보다큰이차전지용외장재가 제공된다.
[11] 상기제 1접착부에는난연성물질이혼합되어 있을수있다.
[12] 상기제 1금속부또는제 2금속부는클래드 (clad)재질로이루어질수있다.
[13] 상기난연성물질은인계화합물,질소계화합물,할로겐계화합물,안티몬계 화합물,몰리브덴계화합물,붕산아연계화합물및금속수산화물중하나 이상을포함할수있다.
[14] 상기제 1금속부로부터상기내부공간방향으로이격되어구비되고전기
절연성을갖는절연부;및상기제 1금속부와상기절연부사이에구비되고,상기 제 1금속부와상기절연부에각각접착되는제 2접착부;를더포함할수있다.
[15] 상기제 1금속부는,제 1물질을포함하는제 1층;및제 2물질을포함하는제 2 층;을포함하고,상기제 1층은상기제 2층보다상기내부공간과인접하게 구비되고,상기제 1층의열전도율은상기제 2층의열전도율보다클수있다.
[16] 상기제 2금속부는,제 3물질을포함하는제 3층;및제 4물질을포함하는제 4 층;을포함하고,상기제 3층은상기제 4층보다상기내부공간과인접하게 구비되고,상기제 3층의열전도율은상기제 4층의열전도율보다클수있다.
[17] 상기제 1물질은구리를포함하고,상기제 2물질은알루미늄을포함할수있다.
[18] 상기제 3물질은구리를포함하고,상기제 4물질은알루미늄을포함할수있다.
[19] 상기제 1접착부및상기제 2접착부는 PPa( acid modified polypropylene)를
포함할수있고,상기절연부는 CPP(cast polypropylene)를포함할수있다.
[2이 상기제 2금속부의외측표면상에적층되는제 1외면부;및상기제 1외면부의 외측표면상에적층되는제 2외면부;를포함하고,상기제 1외면부는
0-nylon(oriented nylon)을포함하고,상기제 2외면부는 PET (polyethylene tereph比 lalate)를포함할수있다.
[21] 상기목적을달성하기위한본발명의다른측면에따르면,전극조립체;및
상기전극조립체를수용하는상기이차전지용외장재;를포함하는이차전지가 WO 2020/175777 PCT/KR2019/017572 제공된다.
발명의효과
[22] 본발명에따르면,이차전지의사용과정에서전해액과외장재간의반응에 의해발생할수있는외장재의손상문제를최소화할수있다.
[23] 특히,본발명에따르면,절연층의손상으로알루미늄층이극성을띠게되는 경우발생할수있는알루미늄층의손상문제를최소화할수있다.
도면의간단한설명
[24] 도 1은본발명에따른이차전지용외장재의층상구조를확대도시한
단면도이다.
[25] 도 2는본발명에따른이차전지용외장재에서제 1금속부의층상구조를확대 도시한단면도이다.
[26] 도 3은본발명에따른이차전지용외장재에서제 2금속부의층상구조를확대 도시한단면도이다.
[27] 도 4는본발명에따른이차전지용외장재에서제 1금속부와전해액이만나 반응하였을때의초기모습을나타낸단면도이다.
[28] 도 5는본발명에따른이차전지용외장재에서제 1금속부와전해액이만나 반응하였을때의후기모습을나타낸단면도이다.
발명의실시를위한형태
[29] 이하,도면을참고하여본발명에따른이차전지용외장재및이차전지의
구조를설명하도록한다.
[3이
[31] 이차적지용외장재및이차적지
[32] 도 1은본발명에따른이차전지용외장재의층상구조를확대도시한
단면도이다.
[33]
[34] 본발명에따른이차전지용외장재 (10,이하,’외장재’라부르기로한다)는도
1에도시된바와같이서로다른물질로이루어진복수의층을갖는,층상구조를 가질수있다.또한,외장재 (10)는얇은두께를갖는시트형태의외장재일수 있다.또한,외장재 (10)에는내부공간이형성될수있는데,내부공간은전극과 분리막으로구성된전극조립체가수용되는공간일수있다.또한,본발명에 따른외장재 (10)는파우치형이차전지에사용되는외장재일수있다.
[35] 도 1에도시된바와같이외장재 (10)는제 1금속부 (100)및제 1금속부 (100)와 이격되어 있는제 2금속부 (200)를포함할수있다.
[36] 또한,제 1금속부 (100)와제 2금속부 (200)사이에는제 1금속부 (100)와제 2 금속부 (200)간의상대적인움직임이발생하지않도록제 1금속부 (100)와제 2 금속부 (200)에각각접착되는제 1접착부 (300)가구비될수있다.제 1 접착부 (300)는 PPa(acid modified polypropylene)를포함할수있다. PPa는 쓸리프로필렌 (polypropylene)에말레산 (maleic acid)이접목된구조를갖는재질을 의미할수있다.
[37] 전술한바와같이외장재 (10)에는내부공간이형성될수있는데,제 1
금속부 (100)는제 2금속부 (200)보다내부공간에인접하게구비될수있다.
[38] 또한,본발명에따른외장재 (10)는제 1금속부 (100)로부터외장재 (10)의내부 공간방향으로이격되어구비되되전기절연성을갖는절연부 (400),및제 1 금속부 (100)와절연부 (400)사이에구비되는제 2접착부 (500)를더포함할수 있다.제 1접착부 (300)의경우와유사하게,제 2접착부 (500)는제 1금속부 (100)와 절연부 (400)간의상대적인움직임이발생하지않도록하기위한구성일수있다. 따라서 ,제 2접착부 (500)는제 1금속부 (100)와절연부 (400)각각에접착될수 있다.또한,제 1접착부 (300)와유사하게제 2접착부 (500)역시 PPa(acid modified polypropylene)를포함할수있다.또한,절연부 (400)는 CPP(cast polypropylene)를 포함할수있다.또는,절연부 (400)는 모모로이루어질수있다.
[39] 계속해서도 1을참고하면,본발명에따른외장재 (10)는,제 2금속부 (200)의 외측표면상에적층되는제 1외면부 (600),및제 1외면부 (600)의외측표면상에 적층되는제 2외면부 (700)를더포함할수있다.’제 2금속부의외측표면및제 1 외면부의외측표면’이라는것은제 2금속부와제 1외면부의양표면 (도 1을 기준으로상면및하면)중외장재 (10)에형성된내부공간과마주보지않는 표면 (도 1을기준으로상면)을의미하는것으로볼수있다.제 1외면부 (600)는 0-nylon(oriented nylon)을포함할수있고,제 2외면부 (700)는 PET (polyethylene terephthalate)를포함할수있다.또는,제 1외면부 (600)는 O-nylon으로이루어질 수있고,제 2외면부 (700)는 PET로이루어질수있다.
[4이 이때,본발명에따르면,제 1금속부 (100)의열전도율은제 2금속부 (200)의
열전도율보다클수있다.또한,제 1금속부 (100)의두께와제 2금속부 (200)의 두께는서로동일할수있다.또한,제 1금속부 (100)와제 2금속부 (200)의두께는 제 1금속부 (100)와제 2금속부 (200)의연신율,및외장재의일부영역을가압하여 외장재에컵 (cup)을형성하는공정에서컵이형성되는깊이등에맞게선정될수 있다.
[41] 파우치형이차전지에서전해액및수분등이외장재의내부에침투하는것을, 외장재의최내측에구비된절연부가방지하게된다.따라서,외장재내의금속이 전해액등과접촉하는것이방지된다.그러나,외장재의일부영역을가압하여 만입된형상을갖는컵 (cup)을형성하는과정 ,또는이차전지의사용과정에서의 충격등에의해절연부에크랙이발생할수있다.이경우,절연부에형성된크랙 사이로전해액등이침투하게되어외장재내의금속부와전해액이서로만나게 된다.
[42] 특히,리튬이차전지의경우전해액에는리튬이온이존재하고,그와동시에 이차전지의작동과정에서외장재내부의금속부에도전위가형성될수있다. 예를들어, (i)이차전지에서외부로돌출되는전극리드 (미도시)와외장재간의 2020/175777 1»（：1^1{2019/017572 밀봉이과도하게되는경우 , (¾전극리드의형상이변형되는경우,및 ( ) 이차전지내부의전극이한쪽으로쏠림으로써전극이외장재와접촉하는경우, 외장재내부의금속부가전극조립체와전기적으로연결됨으로써금속부에 전위가형성될수있다.
[43] 이때,금속부에형성되는전위가변하면서금속부내부에전해액내의리튬 이온이삽입되었다가탈리되는과정이반복되어금속부에크랙이발생하게 된다.리튬과금속부간의반응에의해금속부의일부영역에발생하였던크랙은 금속부의전영역으로확산하게되어,결과적으로외장재의내구성이급격히 떨어지게된다.
[44] 그러나,본발명에따르면,외장재 (10)내의금속부는제 1금속부 (100)및제 2 금속부 (200)로나뉘고제 1금속부 (100)와제 2금속부 (200)가서로이격될수 있다.따라서,절연부 (400)에크랙이발생하는경우,전해액과먼저만나는제 1 금속부 (100)에크랙이발생하더라도그크랙이제 2금속부 (200)로확산되는것이 방지될수있다.따라서,본발명에따르면크랙이외장재 (10)의금속부의전 영역에확산되는것을방지할수있게되어,외장재 (10)의손상이최소화될수 있다.즉,본발명에따르면,도 4에도시된바와같이본발명에따른이차전지용 외장재에서제 1금속부 (100)와전해액 (¾이만나반응한후초기에제 1 금속부 (100)의일부영역에크랙 ((：)이발생하더라도,그러한크랙 (0은도 5에 도시된바와같이제 1금속부 (100)에만국한되므로,제 1금속부 (100)에형성된 크랙 ( 이제 2금속부 (200)에확산되는것을방지할수있다.
[45] 한편,이차전지의사용과정에서과충전,내부단락또는장시간의연속된사용 등으로인해이차전지내부의온도가상승할수있는데,이경우이차전지 내부의열을외부로신속하게방출할필요가있다.특히,이러한열방출은열이 발생하는전극조립체와인접한영역에서보다신속하게일어날필요가있다. 전극조립체와인접한영역에서열방출이신속하게일어나지못하는경우,전극 조립체의온도가계속상승하게되어이차전지가폭발하는등의문제가발생할 수있기때문이다.
[46] 그러나,본발명에따르면,파우치형이차전지에서전극조립체와인접한
영역에구비된제 1금속부 (100)의열전도율이전극조립체로부터상대적으로먼 영역에구비된제 2금속부 (200)의열전도율보다크기때문에,전극조립체와 인접한영역에서열이보다신속하게방출될수있다.따라서,전극조립체의 온도가계속상승하는경우발생할수있는이차전지의안전성문제를해결할수 있다.
[47] 계속해서도 1을참고하면,본발명의다른실시예에따르면,외장재 (10)의제 1 접착부 (300)는난연성물질을포함할수있다.예를들어,제 1접착부 (300)에는 난연성물질이혼합되어 있을수있다.따라서,본발명에따르면,이차전지 내부에화재가발생하더라도제 1접착부 (300)에혼합된난연성물질에의해 그러한화재가이차전지의외부로확산되는것을방지할수있다.난연성물질은 인계화합물,질소계화합물,할로겐계화합물,안티몬계화합물,몰리브덴계 화합물,붕산아연계화합물및금속수산화물중하나이상을포함할수있다.
[48] 난연성물질이난연작용을하는원리는 (i)연소과정에서사용되는열
에너지를소비함으로써연소를억제하는원리 , (ii)가연성물질이기체와 접촉하지못하도록가연성물질을고체나기체로응축시킨후방어막을 형성하는원리, (iii)연소시불연성기체를생성시킴으로써소화작용을하는 원리, (iv)연소반응에서의라디칼연쇄반응 (radical chain reaction)에서라디칼 흡수반응을억제하는원리등을예로들수있다.상기 (i)원리는금속
수산화물에의해,상기 (ii)원리는인계화합물에의해,상기 (iii)원리는금속 수산화물또는안티몬계화합물에의해,상기 (iv)원리는할로겐계화합물에 의해수행될수있다.
[49] 한편,외장재 (10)의제 1금속부 (100)는단일의금속으로이루어질수도있지만, 그와달리본발명의다른실시예에따르면,제 1금속부 (100)는서로다른재질로 이루어진복수의층으로이루어질수도있다.
[5이 도 2는본발명에따른이차전지용외장재에서제 1금속부의층상구조를확대 도시한단면도이다.
[51] 도 2에도시된바와같이본발명의다른실시예에따르면,제 1금속부 (100)는, 제 1층 (110)및제 2층 (120)을포함할수있다.제 2층 (120)과비교하였을때제 1 층 (no)은외장재 (10)의내부공간에상대적으로인접하게구비된층일수있다. 이때,제 1층 (no)의열전도율은제 2층 (120)의열전도율보다클수있다.
[52] 도 3은본발명에따른이차전지용외장재에서제 2금속부의층상구조를확대 도시한단면도이다.
[53] 제 1금속부 (100)의경우와유사하게본발명의다른실시예에따르면,제 2
금속부 (200)역시층상구조를가질수있다.즉,제 2금속부 (200)는제 3층 (2W) 및제 4층 (220)을포함할수있다.제 4층 (220)과비교하였을때제 3층 (210)은 외장재 (10)의내부공간에상대적으로인접하게구비된층일수있다.이때,제 3 층 (2W)의열전도율은제 4층 (220)의열전도율보다클수있다.
[54] 전술한바와같이 ,이차전지내부의온도가상승하는경우,이차전지내부의 열을외부로신속하게방출하기위해서는열이발생하는전극조립체와인접한 영역에서보다신속하게일어날필요가있다.따라서,제 1층 (110)의열전도율이 제 2층 (120)의열전도율보다큰경우,제 2층 (120)에비해상대적으로전극 조립체와인접한제 1층 (1 W)을통해열이외부로신속하게방출될수있다. 마찬가지로,제 3층 (2W)의열전도율이제 4층 (220)의열전도율보다큰경우에도, 제 4층 (220)에비해상대적으로전극조립체와인접한제 3층 (210)을통해열이 외부로신속하게방출될수있다.
[55] 한편,제 1금속부 (100)의제 1층 (110)은제 1물질을포함할수있고,제 2
층 (120)은제 2물질을포함할수있다.또한,제 2금속부 (200)의제 3층 (210)은제 3 물질을포함할수있고,제 4층 (220)은제 4물질을포함할수있다. 2020/175777 1»（：1^1{2019/017572
[56] 이때,전술한바와같이제 1층 ( 0)의열전도율은제 2층 (120)의열전도율보다 클수있고,제 3층 (210)의열전도율은제 4층 (220)의열전도율보다클수 있으므로,제 1물질의열전도율은제 2물질의열전도율보다클수있고,제 3 물질의열전도율은제 4물질의열전도율보다클수있다.
[57] 한편,예를들어,제 1물질및제 3물질은구리를포함할수있고,제 2물질및 제 4물질은알루미늄을포함할수있다.또는,제 1물질및제 3물질은구리로 이루어질수있고,제 2물질및제 4물질은알루미늄으로이루어질수있다.
[58] 구리는알루미늄에비해열전도성이약 1.5배가크다.따라서 ,제 2층 (120)에 비해상대적으로전극조립체에인접하게구비되는제 1층 ( 0)및제 4층 (220)에 비해상대적으로전극조립체에인접하게구비되는제 3층 ( 0)이구리를 포함하거나구리로이루어지는경우이차전지내부의열이보다신속하게 외부로방출될수있다.
[59] 한편,본발명에따른제 1금속부 (100)또는제 2금속부 (200)클래드 ((^(1) 재질로이루어질수있다.
[6이 클래드는두가지이상의금속을접합하여각금속의장점을발휘할수있는 소재로서,클래드에서두가지이상의금속간의접합은압연 («빈 에의해 이루어질수있다.제 1금속부 (100)의제 1층 ( 0)및제 2층 (120)이각각구리와 알루미늄인경우구리와알루미늄간의압연에의한접합으로인해클래드 재질로이루어진제 1금속부 (100)가제조될수있다.이와유사하게,제 2 금속부 (200)의제 3층 ( 0)및제 4층 (220)이각각구리와알루미늄인경우 구리와알루미늄간의압연에의한접합으로인해클래드재질로이루어진제 2 금속부 (200)가제조될수있다.이는제 1내지제 4층이다른금속으로이루어진 경우에도마찬가지로적용될수있다.
[61]
[62] 한편,본발명에따른이차전지는전극과분리막이교대로배치된구조를갖는 전극조립체,및전극조립체를수용하는이차전지용외장재를포함할수있다. 이차전지용외장재에대한설명은전술한내용으로갈음한다.
[63]
[64] 이상에서본발명은비록한정된실시예와도면에의해설명되었으나,본
발명은이것에의해한정되지않으며,본발명이속하는기술분야에서통상의 지식을가진자에의해본발명의기술사상과아래에기재될특허청구범위의 균등범위내에서다양한실시가가능함은물론이다.

Claims

2020/175777 1»（：1/10公019/017572 청구범위
[청구항 1] 내부공간이형성된이차전지용외장재로서 ,
제 1금속부;
상기제 1금속부와이격되어있는제 2금속부;및
상기제 1금속부와상기제 2금속부사이에구비되고,상기제 1금속부와 상기제 2금속부에각각접착되는제 1접착부;를포함하고, 상기제 !금속부는상기제 2금속부보다상기내부공간에인접하게 구비되고,
상기제 금속부의열전도율은상기제 2금속부의열전도율보다큰 이차전지용외장재.
[청구항 2] 청구항 1에서 ,
상기제 1접착부에는난연성물질이혼합되어있는이차전지용외장재.
[청구항 3]
[청구항 4]
Figure imgf000009_0001
상기난연성물질은인계화합물,질소계화합물,할로겐계화합물, 안티몬계화합물,몰리브덴계화합물,붕산아연계화합물및금속 수산화물중하나이상을포함하는이차전지용외장재.
[청구항 5] 청구항 1에서 ,
상기제 1금속부로부터상기내부공간방향으로이격되어구비되고전기 절연성을갖는절연부;및
상기제 1금속부와상기절연부사이에구비되고,상기제 1금속부와상기 절연부에각각접착되는제 2접착부;를더포함하는이차전지용외장재.
[청구항 6] 청구항 1에서 ,
상기제 1금속부는,
제 1물질을포함하는제 1층;및
제 2물질을포함하는제 2증;을포함하고,
상기제 1층은상기제 2층보다상기내부공간과인접하게구비되고, 상기제 1층의열전도율은상기제 2층의열전도율보다큰이차전지용 외장재.
[청구항 7] 청구항 1에서 ,
상기제 2금속부는,
제 3물질을포함하는제 3층;및
제 4물질을포함하는제 4증;을포함하고,
상기제 3층은상기제 4층보다상기내부공간과인접하게구비되고, 상기제 3층의열전도율은상기제 4층의열전도율보다큰이차전지용 WO 2020/175777 PCT/KR2019/017572 외장재.
［청구항 8］ 청구항 6에서 ,
상기제 1물질은구리를포함하고,
상기제 2물질은알루미늄을포함하는이차전지용외장재.
［청구항 9］ 청구항 7에서 ,
상기제 3물질은구리를포함하고,
상기제 4물질은알루미늄을포함하는이차전지용외장재.
［청구항 1이 청구항 5에서,
상기제 1접착부및상기제 2접착부는 PPa( acid modified polypropylene)를 포함하고,
상기절연부는 CPP(cast polypropylene)를포함하는이차전지용외장재. ［청구항 11］ 청구항 1에서,
상기제 2금속부의외측표면상에적층되는제 1외면부;및 상기제 1외면부의외측표면상에적층되는제 2외면부;를포함하고, 상기제 1외면부는 0-nylon(oriented nylon)을포함하고, 상기제 2외면부는 PET (polyethylene tereph比 lalate)를포함하는이차전지용 외장재.
［청구항 12］ 전극조립체;및
상기전극조립체를수용하는청구항 1에따른이차전지용외장재;를 포함하는이차전지.
PCT/KR2019/017572 2019-02-27 2019-12-12 이차전지용 외장재 및 그 외장재를 포함하는 이차전지 WO2020175777A1 (ko)

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