WO2019164371A1 - Joint d'étanchéité pour batterie secondaire et batterie secondaire le comprenant - Google Patents

Joint d'étanchéité pour batterie secondaire et batterie secondaire le comprenant Download PDF

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Publication number
WO2019164371A1
WO2019164371A1 PCT/KR2019/002287 KR2019002287W WO2019164371A1 WO 2019164371 A1 WO2019164371 A1 WO 2019164371A1 KR 2019002287 W KR2019002287 W KR 2019002287W WO 2019164371 A1 WO2019164371 A1 WO 2019164371A1
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WIPO (PCT)
Prior art keywords
group
carbon atoms
gasket
secondary battery
rust
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PCT/KR2019/002287
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English (en)
Korean (ko)
Inventor
이병구
김도균
정상석
신항수
김찬배
Original Assignee
주식회사 엘지화학
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Publication date
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to JP2020529598A priority Critical patent/JP7020631B2/ja
Priority to CN201980006279.5A priority patent/CN111448682B/zh
Priority to US16/954,791 priority patent/US11631915B2/en
Priority to EP19757420.5A priority patent/EP3709384A4/fr
Priority claimed from KR1020190021676A external-priority patent/KR102270122B1/ko
Publication of WO2019164371A1 publication Critical patent/WO2019164371A1/fr

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    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • 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
    • H01M50/147—Lids or covers
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/197—Sealing members 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a secondary battery gasket and a secondary battery comprising the same.
  • a secondary battery means a battery that can be charged and discharged, unlike a primary battery that cannot be charged, and is widely used for a power source of an electronic device such as a mobile phone, a notebook computer, a camcorder, or an electric vehicle.
  • the lithium secondary battery has an operating voltage of 3.6 V, and has a capacity of about three times that of a nickel-cadmium battery or a nickel-hydrogen battery, which is widely used as a power source for electronic equipment, and has a high energy density per unit weight. Is rapidly increasing.
  • Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as positive electrode active materials and negative electrode active materials, respectively.
  • the lithium secondary battery may be classified into a square battery, a cylindrical battery, and a pouch type battery.
  • the lithium ion secondary battery includes an electrode assembly in which an anode, a separator, and an anode are sequentially disposed, and an exterior member that seals and houses the electrode assembly together with the electrolyte solution.
  • the packaging material has a can formed with an open end and a cap assembly sealingly coupled to the open end of the can.
  • a gasket is interposed between the can and the cap assembly to seal the battery.
  • the gasket of the battery polymer resin layers such as polypropylene have been used.
  • rust occurs in a crimping part of a battery, for example, a trimming part in which Fe is exposed in a high temperature and high humidity atmosphere, and there is a need for improvement.
  • One problem to be solved by the present invention is to minimize the occurrence of rust in the crimping portion of the battery in a high temperature, high humidity atmosphere, and to provide a secondary battery gasket and secondary battery with improved sealing characteristics.
  • a base resin and a rust inhibitor wherein the base resin comprises polybutylene terephthalate, the rust preventive agent comprises a rust-preventing material and a polymer resin, the base resin and the polymer resin
  • the rust preventing material is provided with a gasket for a secondary battery comprising at least one of the compounds of the following formula 1-1 and formula 1-2.
  • R 1 is selected from the group consisting of a linear alkyl group having 8 to 20 carbon atoms, a branched alkyl group having 8 to 20 carbon atoms, an alkenyl group having 8 to 20 carbon atoms, alkynyl group having 8 to 20 carbon atoms, and an aryl group having 8 to 18 carbon atoms. Which one,
  • R 2 is a linear alkylene group having 8 to 20 carbon atoms, a branched alkylene group having 8 to 20 carbon atoms, an alkenylene group having 8 to 20 carbon atoms, an alkenylene group having 8 to 20 carbon atoms, and an arylene group having 8 to 18 carbon atoms. Any one selected from the group consisting of,
  • a 1 and A 2 are each independently any one selected from the group consisting of a carboxyl group, an amino group, a nitro group, a hydroxyl group, and a fluorine group.
  • an electrode assembly including an anode and a cathode; A can including a top opening; A cap assembly formed on an upper circumferential surface of the can and coupled to the can by a crimping portion formed by bending a portion of the upper opening inwardly; And a secondary battery gasket, wherein the secondary battery gasket is provided with a secondary battery interposed between the can and the cap assembly.
  • the gasket for a secondary battery includes a specific anti-rust material, and the anti-rust material is vaporized and adsorbed to an exposed portion of Fe at a crimping portion, particularly at an upper opening of a can, so that Fe is in direct contact with water and oxygen. Can be prevented. Accordingly, it is possible to minimize the occurrence of rust in the crimping portion of the battery in a high temperature, high humidity atmosphere.
  • the present invention can improve the heat resistance and sealing properties of the gasket using a polybutylene terephthalate (PBT) as the base resin.
  • PBT polybutylene terephthalate
  • the specific rust preventive material is injected together with polybutylene terephthalate having a high injection temperature, wherein the specific rust preventive material does not collapse the structure even at the high injection temperature, so that the rust preventive material of the rust preventive material in the final manufactured gasket Properties can be maintained.
  • the specific rust-preventing material is dispersed in a small size at the level of omstrong and is present in the gasket, the voids generated in the gasket during vaporization are formed to a negligible level.
  • the gasket of the present invention can be maintained in sealing properties as compared with the case of using conventional antirust materials dispersed in a large size of micro ( ⁇ m) level and present in the gasket.
  • FIG. 1 is a cross-sectional view illustrating one surface of a secondary battery in which a gasket for a secondary battery according to an embodiment of the present invention is introduced.
  • FIG. 2 is a cross-sectional view illustrating a secondary battery in which a gasket for a secondary battery is introduced in an embodiment of the present invention.
  • FIG 3 is a cross-sectional view illustrating a secondary battery in which a gasket for a secondary battery according to another embodiment of the present invention is introduced.
  • the terms “comprise”, “comprise” or “have” are intended to indicate that there is a feature, number, step, component, or combination thereof, that is, one or more other features, It should be understood that it does not exclude in advance the possibility of the presence or addition of numbers, steps, components, or combinations thereof.
  • a gasket for a secondary battery includes a base resin and a rust preventive agent
  • the base resin includes a polybutylene terephthalate
  • the rust preventive agent includes a rust preventive substance and a polymer resin
  • the base resin and the The polymer resin is different
  • the rust preventive substance includes at least one of the compounds of the following Formulas 1-1 and 1-2.
  • R 1 is selected from the group consisting of a linear alkyl group having 8 to 20 carbon atoms, a branched alkyl group having 8 to 20 carbon atoms, an alkenyl group having 8 to 20 carbon atoms, alkynyl group having 8 to 20 carbon atoms, and an aryl group having 8 to 18 carbon atoms. Which one,
  • R 2 is a linear alkylene group having 8 to 20 carbon atoms, a branched alkylene group having 8 to 20 carbon atoms, an alkenylene group having 8 to 20 carbon atoms, an alkenylene group having 8 to 20 carbon atoms, and an arylene group having 8 to 18 carbon atoms. Any one selected from the group consisting of,
  • a 1 and A 2 are each independently any one selected from the group consisting of a carboxyl group, an amino group, a nitro group, a hydroxyl group, and a fluorine group.
  • the rust inhibitor may be a vaporizable rust inhibitor (VCI; Volatile Corrosion Inbibitor).
  • VCI Volatile Corrosion Inbibitor
  • the rust preventive agent may be vaporized and adsorbed to a trimming part in which Fe is exposed at a crimping part, particularly at the top opening of the can, thereby preventing Fe from directly contacting water and oxygen.
  • the rust inhibitor may be present dispersed in a molecular unit in the base resin of the gasket.
  • the rust preventive material may include at least one of the compounds of Formulas 1-1 and 1-2.
  • R 1 is selected from the group consisting of a linear alkyl group having 8 to 20 carbon atoms, a branched alkyl group having 8 to 20 carbon atoms, an alkenyl group having 8 to 20 carbon atoms, alkynyl group having 8 to 20 carbon atoms, and an aryl group having 8 to 18 carbon atoms. Which one,
  • R 2 is a linear alkylene group having 8 to 20 carbon atoms, a branched alkylene group having 8 to 20 carbon atoms, an alkenylene group having 8 to 20 carbon atoms, an alkenylene group having 8 to 20 carbon atoms, and an arylene group having 8 to 18 carbon atoms. Any one selected from the group consisting of,
  • a 1 and A 2 are each independently any one selected from the group consisting of a carboxyl group, an amino group, a nitro group, a hydroxyl group, and a fluorine group.
  • a 1 and / or A 2 are electrically and / or chemically adsorbed to the crimped portion, in particular the Fe exposed portion at the top opening of the can, R 1 and / or R 2 may form a hydrophobic layer to prevent Fe from coming in direct contact with water and oxygen. Through this, it is possible to minimize the occurrence of rust in the crimping portion of the battery even under high temperature, high humidity conditions.
  • the gasket for a secondary battery of the present invention is manufactured through the method of injecting the base resin and the rust preventive agent containing polybutylene terephthalate at high temperature.
  • the injection temperature of the polybutylene terephthalate is a high temperature of 280 °C level, the anti-rust material used in the present invention does not collapse the structure even at the injection temperature. Therefore, the antirust effect by the antirust material can be maintained even in the finally manufactured gasket.
  • the rust preventive material may include at least one of the following Formulas 1-3 and 1-4.
  • a 1 is the same as A 1 of Formulas 1-1 and 1-2,
  • Q may be 3 to 6.
  • the rust preventive materials of Equation 1-3 and Equation 1-4 may exhibit the rust preventive effect described above, and do not deform the structure at the injection temperature of the base resin including polybutylene terephthalate. In addition, it is possible to minimize the deterioration of the sealing properties of the gasket for the following reasons.
  • materials such as NaNO 2 and NaNO 3 which are used as rust preventive materials, are dispersed and present in a large unit at a micro ( ⁇ m) level in the resin, so that when the materials are vaporized, large voids are generated in the resin constituting the gasket. .
  • the sealing property of the gasket may be degraded, thereby degrading battery performance.
  • the rust preventive materials of Equation 1-3 and Equation 1-4 are dispersed in a small size at the Omstrong level and present in the gasket, the voids generated in the gasket during vaporization are formed to a negligible level. . Therefore, the fall of the sealing characteristic which a gasket has can be minimized.
  • the rust preventing material may include at least one selected from the group consisting of decanoic acid, lauric acid, and myristic acid.
  • the above-described rust-preventing effect can be exhibited, and the structure is not deformed at the injection temperature of the base resin including polybutylene terephthalate.
  • the deterioration of the sealing property of the gasket can be minimized.
  • the polymer resin may be mixed with the rust preventive material to serve to disperse the rust preventive material in the base resin.
  • the polymer resin may be different from the base resin for smooth dispersion of the rust preventing material in the base resin.
  • the polymer resin is polyethylene (PE); And ethylene derived units, propylene derived units, butylene terephthalate derived units, ethylene terephthalate derived units, and methyl acrylate derived units. Copolymers comprising two or more derived units; It may include at least one of. Specifically, the above materials may be mixed and used.
  • the polymer resin is preferable in that it is easy to mix with the rust-preventing material and easy to mix with polybutylene terephthalate. In addition, the antirust property of the gasket can be further improved.
  • the polymer resin may be a copolymer including an ethylene-derived unit and a methyl acrylate-derived unit in consideration of a manufacturing process and mixing with the base resin.
  • the weight ratio of the polymer resin and the rust preventing material may be 99: 1 to 80:20, specifically 99: 1 to 85:15, and more specifically 99: 1 to 90:10. If the above range is satisfied, the rust preventive effect may be more effective.
  • the rust preventive agent may be in the form of pellets. Specifically, the rust preventive agent may be in the form of pellets formed through the pelletization process after mixing the polymer resin and the rust preventive material. Through this, the rust preventive agent can be smoothly dispersed in the base resin. If only the rust preventing material is mixed with the base resin in a non-pellet form (i.e., without a polymer resin), the rust preventing function is sharply degraded because the rust preventing material is not smoothly dispersed in the base resin.
  • the base resin may include polybutylene terephthalate (PBT), and specifically, may be polybutylene terephthalate. Since the polybutylene terephthalate has high heat resistance and low oxygen and moisture permeability, it is more preferable as the base resin of the gasket. Specifically, when polypropylene having a low melting point of about 160 ° C. is used as the base resin, the polypropylene melts when a short circuit between the positive electrode and the negative electrode occurs, thereby causing a problem of deterioration of battery stability. On the other hand, in the case of polybutylene terephthalate has a high melting point of about 230 °C level, the gasket is maintained to ensure the stability of the battery.
  • PBT polybutylene terephthalate
  • the base resin is polybutylene terephthalate
  • the antirust material included in the anticorrosive for the gasket when used, there are advantages as follows.
  • the polybutylene terephthalate is degraded by weakening the C ⁇ O bonds contained in the polybutylene terephthalate, thereby deteriorating the physical properties of the gasket. Specifically, the ductility of the polybutylene terephthalate is lowered, and cracks are likely to occur in the gasket due to external force.
  • the rust preventive material of the present invention can minimize the weakening of the C ⁇ O bonds contained in the polybutylene terephthalate or have no influence on the bonds, so that the physical properties of the gasket can be maintained.
  • the polybutylene terephthalate has a high injection temperature of 280 °C, the anti-rust material of the present invention injected with the polybutylene terephthalate does not collapse the structure even at the high temperature, so that the final gasket Antirust properties can be maintained.
  • the weight ratio of the polybutylene terephthalate and the rust preventive agent may be 98: 2 to 85:15, specifically 98: 2 to 90:10, and more specifically 93: 7 to 90:10. When the above range is satisfied, the above-described antirust effect can be further improved.
  • a secondary battery includes an electrode assembly including a positive electrode and a negative electrode; A can including a top opening; A cap assembly formed on an upper circumferential surface of the can and coupled to the can by a crimping portion formed by bending a portion of the upper opening inwardly; A secondary battery gasket may be included, and the secondary battery gasket may be interposed between the can and the cap assembly.
  • the gasket for secondary batteries is the same as the gasket for secondary batteries of the above-mentioned embodiment, description is abbreviate
  • the secondary battery may have a cylindrical shape, a square shape, or the like, and specifically, may have a cylindrical shape.
  • the top opening of the can may also be circular.
  • the secondary battery 100 includes a can 20 for accommodating the electrode assembly 10 together with an electrolyte, a cap assembly 30 sealingly coupled to an open end of the can 20, A gasket 40 interposed between the cylindrical can 20 and the cap assembly 30.
  • the gasket 40 is the same as the gasket for the secondary battery of the above-described embodiment.
  • the material of the can 20 is not particularly limited, and may be formed of at least one of stainless steel, steel, aluminum, or an equivalent thereof.
  • the can 20 uses a metal component because it has to be conductive, and this metal component may be vulnerable to corrosion due to moisture contact from the outside.
  • the can 20 may include a layer made of Fe and a layer made of Ni which prevents the layer made of Fe from corrosion.
  • the can 20 may be cylindrical, rectangular, or the like, and specifically, may be cylindrical.
  • the open end of the can 20 may include a trimming portion 21a, and the trimming portion 21a may expose the Fe component of the can. Specifically, in the final product state, the trimming portion 21a can be seen to be included in the crimping portion 21.
  • the cap assembly 30 may include a top cap that seals the open end of the can 20, and a safety vent 36.
  • One surface of the safety vent 36 may be in contact with all of the side surface, the upper surface and the lower surface of the top cap, and the other surface may be bent and disposed to contact the inner surface of the gasket 40.
  • the safety vent 36 may be electrically connected to the electrode assembly 10.
  • the cap assembly 30 having a shape in which the safety vent 36 is bent to surround the top cap may have a contact surface between the safety vent 36 and the top cap to form at least one connection part. Is formed.
  • welding used in the present invention is used as a concept that includes not only welding in a literal sense such as laser welding, ultrasonic welding, resistance welding, but also a fastening method such as soldering. Welding may be performed in the process of assembling the cap assembly 30 itself, or may be performed even when the cap assembly 30 is installed in the can 20.
  • the safety vent 36 serves to cut off a current or exhaust gas when the pressure inside the battery rises, and is preferably made of metal.
  • the thickness of the safety vent 36 may vary depending on the material, structure, and the like, and the thickness of the safety vent 36 is not particularly limited as long as the safety vent 36 may burst while generating a high pressure inside the battery, and may be, for example, 0.2 to 0.6 mm. .
  • the thickness of the top cap portion in contact with the safety vent 36 is not particularly limited as long as it can protect various components of the cap assembly 30 from pressure applied from the outside, for example, 0.3 To 0.5 mm. If the thickness of the top cap is too thin, it is difficult to exert mechanical rigidity. On the contrary, if the thickness of the top cap is too thick, the capacity of the battery may be reduced by increasing the size and weight.
  • the gasket 40 may be formed in a cylindrical shape, each end of which is open at both ends as a whole, may vary depending on the shape of the top opening of the can, specifically, may be a cylindrical shape.
  • One side end facing the inner surface of the can 20 is preferably a structure bent at an angle, specifically at a right angle toward the center so as to be placed in the opening of the can 20, that is, the crimping portion 21.
  • the other end of the gasket 40 is first straight and is oriented in the axial direction of the gasket 40, and is bent at an angle toward the center during the pressing process with the can 20 so that the inner and outer circumferential surfaces of the gasket 40 are cap assemblies ( The top cap of 30 and the inner side of the can 20 are folded in close contact.
  • the crimping portion 21 is formed at the top of the can so that the cap assembly 30 can be mounted at the open end of the can. More specifically, the crimping portion 21 forms an indentation inward by beading the upper end of the can 20, mounts the gasket 40 at the open end, and top cap, PTC element, safety vent 36. It is formed by inserting the outer circumferential surface of and then bending the upper end of the can inward. As a result, the gasket 40 positioned on the inner side of the crimping portion 21 is enclosed, and the cap assembly 30 is mounted by performing a crimping and pressing process.
  • the crimping portion 21 has a structure in which an end portion is bent inward so that the cap assembly 30 can be stably mounted on an open upper end of the can 20 in a state where the gasket 40 is interposed therebetween.
  • the side wall of the crimping portion 21 is formed perpendicular to the side of the battery.
  • the electrode assembly 10 may include a positive electrode and a negative electrode. Referring to FIG. 2, the electrode assembly 10 is interposed between two electrode plates 11 having different polarities and having a wide plate shape in a roll form, and the electrode plates 11 to mutually insulate the electrode plates 11. Or a separator 12 disposed on the left side or the right side of any one electrode plate 11. In this case, the electrode plates 11 spaced apart from each other by the separator 12 may be a cathode and an anode.
  • the electrode assembly 10 is preferably a structure wound in a so-called 'Jelly Roll' shape. Of course, a positive electrode plate and a negative electrode plate of a predetermined standard may be stacked in the separator 12.
  • the electrolyte is to move lithium ions generated by the electrochemical reaction of the electrode plate 11 during charging and discharging of the secondary battery 100.
  • the electrolyte may be a polymer using a non-aqueous organic electrolyte or a polymer electrolyte which is a mixture of lithium salts and high purity organic solvents, but the type of electrolyte is not a problem.
  • a center pin (not shown) may be inserted into the center of the can 20 to prevent the electrode assembly 10 wound in a jelly roll form from being loosened and to serve as a gas passageway inside the secondary battery 100. It may be.
  • An upper portion of the can 20, that is, an upper portion of the upper portion of the electrode assembly 10 may be provided with a beading portion 24 which is bent from outside to the inside to prevent the up and down flow of the electrode assembly 10.
  • Cylindrical battery 100 may further include an auxiliary gasket 42.
  • the auxiliary gasket 42 is configured to surround the outer circumferential surface of the current blocking device 38 as a gasket for the current blocking device 38.
  • the auxiliary gasket 42 contacts the upper and side portions at the outer circumferential surface of the current blocking element 38 to support the upper and side portions of the current blocking element 38.
  • the auxiliary gasket 42 serves to electrically insulate the current blocking device 38 and the safety vent 36 from each other, except for a portion where the protruding portion of the safety vent 36 contacts with the current blocking element 38. Do it.
  • the cap assembly 30 may include a top cap disposed to seal the open end of the can 20 and contact the protrusion of the gasket 40, and a PTC element disposed to contact the top cap.
  • Positive temperature coefficient 34 and one surface may include a safety vent 36 disposed in contact with the PTC element 34 and with a portion of the other surface in contact with the gasket 40.
  • the PTC element 34 serves to block the current by greatly increasing the battery resistance when the temperature inside the battery increases, and the thickness of the PTC element 34 may also vary depending on the material and structure, for example, 0.2 mm. To 0.4 mm. When the thickness of the PTC element 34 is greater than 0.4 mm, the internal resistance may increase, and the size of the battery may be increased to reduce the capacity of the battery compared to the same standard. On the contrary, when the thickness of the PTC element 34 is thinner than 0.2 mm, it is difficult to exert a desired current interruption effect at a high temperature and can be destroyed even by a weak external impact. Accordingly, the thickness of the PTC element 34 may be appropriately determined within the above thickness range in consideration of these points in combination.
  • the thickness of the top cap portion in contact with the PTC element 34 is not particularly limited as long as it can protect various components of the cap assembly 30 from the pressure applied from the outside, for example, 0.3 to 0.5 May be mm. If the thickness of the top cap is too thin, it is difficult to exert mechanical rigidity. On the contrary, if the thickness of the top cap is too thick, the capacity of the battery may be reduced by increasing the size and weight.
  • the secondary battery including the top cap, the PTC element 34, and the cap assembly 30 having the safety vent may be used as a power source for a mobile phone or a notebook, which stably provides a constant output.
  • the present invention can provide a battery pack comprising a plurality of lithium secondary batteries prepared by the above embodiment by electrically connecting, the battery pack is a power tool (Electric Tool, Electric Vehicle, EV), hybrid Medium to large in one or more devices selected from the group consisting of electric vehicles, electric trucks, electric commercial vehicles, or power storage systems, including electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs).
  • the battery pack may be used as a device power source.
  • a copolymer comprising an ethylene-derived unit and a methyl acrylate-derived unit and lauric acid were mixed at 100 ° C. in a weight ratio of 95: 5, and then pelletized to prepare a rust inhibitor in the form of a pellet.
  • 240 g of the rust preventive agent and 3,000 g of polybutylene terephthalate were mixed and then injected at a temperature of 280 ° C. to prepare a gasket.
  • the can consisted of an inner layer of Fe and a Ni layer disposed on both sides of the inner layer. After placing a gasket in the top opening of the can, the cap assembly was placed in contact with the inner circumferential surface of the gasket, and then a crimping portion was formed. Through this, a battery including the gasket was manufactured.
  • a copolymer comprising an ethylene-derived unit and a methyl acrylate-derived unit and lauric acid were mixed at 100 ° C. in a weight ratio of 95: 5, and then pelletized to prepare a rust inhibitor in the form of a pellet.
  • 150 g of the rust inhibitor and 3,000 g of polybutylene terephthalate were mixed, and then injected at a temperature of 280 ° C. to prepare a gasket.
  • the can consisted of an inner layer of Fe and a Ni layer disposed on both sides of the inner layer. After placing a gasket in the top opening of the can, the cap assembly was placed in contact with the inner circumferential surface of the gasket, and then a crimping portion was formed. Through this, a battery including the gasket was manufactured.
  • a copolymer comprising ethylene derived units and methyl acrylate derived units and decanoic acid were mixed at 100 ° C. in a weight ratio of 95: 5, and then pelletized to prepare a rust preventive agent in pellet form.
  • 240 g of the rust preventive agent and 3,000 g of polybutylene terephthalate were mixed and then injected at a temperature of 280 ° C. to prepare a gasket.
  • the can consisted of an inner layer of Fe and a Ni layer disposed on both sides of the inner layer. After placing a gasket in the top opening of the can, the cap assembly was placed in contact with the inner circumferential surface of the gasket, and then a crimping portion was formed. Through this, a battery including the gasket was manufactured.
  • Polybutylene terephthalate was injected at 280 ° C to prepare a gasket.
  • the can consisted of an inner layer of Fe and a Ni layer disposed on both sides of the inner layer. After placing a gasket in the top opening of the can, the cap assembly was placed in contact with the inner circumferential surface of the gasket, and then a crimping portion was formed. Through this, a battery including the gasket was manufactured.
  • Polyethylene and NaNO 2 were mixed at 140 ° C. in a weight ratio of 70:30, and then pelletized to prepare a rust preventive agent in pellet form.
  • 240 g of the rust preventive agent and 3,000 g of polybutylene terephthalate were mixed and then injected at a temperature of 280 ° C. to prepare a gasket.
  • the can consisted of an inner layer of Fe and a Ni layer disposed on both sides of the inner layer. After placing a gasket in the top opening of the can, the cap assembly was placed in contact with the inner circumferential surface of the gasket, and then a crimping portion was formed. Through this, a battery including the gasket was manufactured.
  • a copolymer comprising an ethylene-derived unit and a methyl acrylate-derived unit and lauric acid were mixed at 100 ° C. in a weight ratio of 95: 5, and then pelletized to prepare a rust inhibitor in the form of a pellet.
  • 240 g of the rust inhibitor and 3,000 g of poly-tetrafluoroethylene (PFA) were mixed and then injected at a temperature of 380 ° C. to prepare a gasket.
  • the can consisted of an inner layer of Fe and a Ni layer disposed on both sides of the inner layer. After placing a gasket in the top opening of the can, the cap assembly was placed in contact with the inner circumferential surface of the gasket, and then a crimping portion was formed. Through this, a battery including the gasket was manufactured.
  • the can consisted of an inner layer of Fe and a Ni layer disposed on both sides of the inner layer. After placing a gasket in the top opening of the can, the cap assembly was placed in contact with the inner circumferential surface of the gasket, and then a crimping portion was formed. Through this, a battery including the gasket was manufactured.
  • the percentage of the area where corrosion occurred based on the area of the trimming part of the upper outer circumferential surface of the can is expressed in%. Corrosion occurred at 3 points over 50%, 2 points over 10% and below 50%, 1 point below 10%, and 0 points without corrosion. After scoring the 30 cells in this way, the average value of the scores were converted to 10 out of 10 points (mean value x (10/3)) to evaluate the antirust function by the final score derived. On the other hand, the extent to which corrosion occurred was visually confirmed with a microscope.
  • Example 1 Each of the batteries of Example 1 and Comparative Examples 1 to 4 was stored at 72 ° C. at SOC 100% for 40 days.
  • the cell weights before and after storage were evaluated and shown in Table 2 below.
  • the weight change rate of Table 2 calculated the following formula.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

La présente invention concerne un joint d'étanchéité pour une batterie secondaire comprenant une résine de base et un antirouille, la résine de base comprenant du polybutylène téréphtalate et l'antirouille comprenant un matériau antirouille et une résine polymère, la résine de base et la résine polymère étant différentes l'une de l'autre, et le matériau antirouille comprenant au moins l'un des composés des formules suivantes 1-1 et 1-2. [formule 1-1] A1-R1 [formule 1-2] A1-R2-A2, où R1 est un groupe quelconque choisi dans le groupe constitué par un groupe alkyle linéaire de 8 à 20 atomes de carbone, un groupe alkyle ramifié de 8 à 20 atomes de carbone , un groupe alcényle de 8 à 20 atomes de carbone, un groupe akynyl de 8 à 20 atomes de carbone, et un groupe aryle de 8 à 18 atomes de carbone, R2 est un groupe quelconque choisi dans le groupe constitué par un groupe alkylène linéaire de 8 à 20 atomes de carbone , un groupe alkylène ramifié de 8 à 20 atomes de carbone, un groupe alcénylène de 8 à 20 atomes de carbone, un groupe alcénylènyle de 8 à 20 atomes de carbone, et un groupe arylène de 8 à 18 atomes de carbone, et A1 et A2 sont chacun indépendamment l'un quelconque choisi dans le groupe constitué par un groupe carboxyle, un groupe amino, un groupe nitro, un groupe hydroxy et un groupe fluor.
PCT/KR2019/002287 2018-02-23 2019-02-25 Joint d'étanchéité pour batterie secondaire et batterie secondaire le comprenant WO2019164371A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2020529598A JP7020631B2 (ja) 2018-02-23 2019-02-25 二次電池用のガスケットおよびこれを含む二次電池
CN201980006279.5A CN111448682B (zh) 2018-02-23 2019-02-25 用于二次电池的垫圈和包括该用于二次电池的垫圈的二次电池
US16/954,791 US11631915B2 (en) 2018-02-23 2019-02-25 Gasket for secondary battery, and secondary battery including the same
EP19757420.5A EP3709384A4 (fr) 2018-02-23 2019-02-25 Joint d'étanchéité pour batterie secondaire et batterie secondaire le comprenant

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20180022063 2018-02-23
KR10-2018-0022063 2018-02-23
KR10-2019-0021676 2019-02-25
KR1020190021676A KR102270122B1 (ko) 2018-02-23 2019-02-25 이차전지용 개스킷 및 이를 포함하는 이차 전지

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WO2019164371A1 true WO2019164371A1 (fr) 2019-08-29

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960007699B1 (ko) * 1992-02-14 1996-06-08 빠드리샤 꼬송 카르복실산 기재의부식-억제 조성물 및 그의 부식 방지용 용도
KR20010055181A (ko) * 1999-12-09 2001-07-04 이구택 금속펠렛의 코팅방법
KR20010089813A (ko) * 1999-11-12 2001-10-08 후쿠타니 야스오 방청제
KR100871674B1 (ko) * 2001-03-27 2008-12-05 아르셀러미탈 프랑스 금속 표면의 카르복실화 처리 방법
JP2009197322A (ja) * 2007-12-12 2009-09-03 Excor Korrosionsforschung Gmbh 気相腐食防止剤およびその製造方法
KR20160043724A (ko) * 2014-10-14 2016-04-22 주식회사 엘지화학 실링층을 포함하는 원통형 이차 전지
KR20170004042A (ko) * 2017-01-02 2017-01-10 주식회사 엘지화학 이차전지용 방청 튜브 및 이를 포함하는 이차전지

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960007699B1 (ko) * 1992-02-14 1996-06-08 빠드리샤 꼬송 카르복실산 기재의부식-억제 조성물 및 그의 부식 방지용 용도
KR20010089813A (ko) * 1999-11-12 2001-10-08 후쿠타니 야스오 방청제
KR20010055181A (ko) * 1999-12-09 2001-07-04 이구택 금속펠렛의 코팅방법
KR100871674B1 (ko) * 2001-03-27 2008-12-05 아르셀러미탈 프랑스 금속 표면의 카르복실화 처리 방법
JP2009197322A (ja) * 2007-12-12 2009-09-03 Excor Korrosionsforschung Gmbh 気相腐食防止剤およびその製造方法
KR20160043724A (ko) * 2014-10-14 2016-04-22 주식회사 엘지화학 실링층을 포함하는 원통형 이차 전지
KR20170004042A (ko) * 2017-01-02 2017-01-10 주식회사 엘지화학 이차전지용 방청 튜브 및 이를 포함하는 이차전지

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