WO2018199604A1 - Élément isolant, procédé de fabrication d'un élément isolant, et procédé de fabrication d'une batterie cylindrique comprenant un élément isolant - Google Patents

Élément isolant, procédé de fabrication d'un élément isolant, et procédé de fabrication d'une batterie cylindrique comprenant un élément isolant Download PDF

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Publication number
WO2018199604A1
WO2018199604A1 PCT/KR2018/004761 KR2018004761W WO2018199604A1 WO 2018199604 A1 WO2018199604 A1 WO 2018199604A1 KR 2018004761 W KR2018004761 W KR 2018004761W WO 2018199604 A1 WO2018199604 A1 WO 2018199604A1
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WIPO (PCT)
Prior art keywords
insulating member
binder
substrate
glass fiber
filled
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PCT/KR2018/004761
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English (en)
Korean (ko)
Inventor
신항수
김도균
정상석
이병국
이병구
김찬배
Original Assignee
주식회사 엘지화학
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Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to JP2019526518A priority Critical patent/JP6879491B2/ja
Priority to CN201880005811.7A priority patent/CN110168793B/zh
Priority to EP18791914.7A priority patent/EP3618159B1/fr
Priority to US16/490,254 priority patent/US20200013998A1/en
Priority claimed from KR1020180047588A external-priority patent/KR102172059B1/ko
Publication of WO2018199604A1 publication Critical patent/WO2018199604A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

Definitions

  • the present invention relates to an insulating member, a method for manufacturing the insulating member, and a method for manufacturing a cylindrical battery including the insulating member.
  • the present invention includes an insulating plate substrate made of a glass fiber material made of a network structure and a binder applied to the insulating plate substrate.
  • Secondary batteries that can be charged and discharged are widely used as energy sources for mobile devices. Secondary batteries are also attracting attention as power sources such as electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (Plug-In HEVs), which are proposed as alternatives to gasoline and diesel vehicles. In addition, it can be applied to various fields such as power tools, electric bicycles, E-scooters, electric golf carts, or power storage systems that require high power. Do.
  • EVs electric vehicles
  • HEVs hybrid electric vehicles
  • Plug-In HEVs plug-in hybrid electric vehicles
  • the battery is classified into a cylindrical or square battery that is embedded in a cylindrical or rectangular metal can, and a pouch type battery in which an electrode assembly is embedded in a pouch type case of an aluminum laminate sheet, of which a cylindrical battery is used.
  • a cylindrical or rectangular metal can a pouch type battery in which an electrode assembly is embedded in a pouch type case of an aluminum laminate sheet, of which a cylindrical battery is used.
  • the electrode assembly embedded in the battery case is a power generator capable of charging and discharging composed of a laminated structure of a cathode, a separator, and a cathode, and has a jelly-roll type wound between a long sheet-type anode and an anode coated with an active material through a separator, A plurality of positive and negative electrodes of size are classified into a stack type in which a plurality of positive and negative electrodes are sequentially stacked in a state where a separator is interposed. Jelly-roll type electrode assembly has the advantages of easy manufacturing and high energy density per weight.
  • FIG. 1 is a vertical cross-sectional view of a conventional cylindrical battery upper end portion is schematically shown.
  • the cylindrical battery 10 includes the electrode assembly 11 in a cylindrical can 13 with an insulating member 12 mounted on an upper end of a jelly-roll type (wound) electrode assembly 11.
  • the cap assembly 14 having electrode terminals (for example, positive electrode terminals; not shown) is formed at the open top of the cylindrical can 13. It is produced by sealing it.
  • the insulating member 12 is a plate-shaped member made of a material having electrical insulation such as polyethylene terephthalate (PET), and is positioned between the electrode assembly 11 and the cap assembly 14, and the cap assembly 14 and the cylindrical can. It serves to prevent the occurrence of short circuit due to the contact of (13).
  • PET polyethylene terephthalate
  • the insulating member made of PET melts or shrinks.
  • the deformed PET does not properly wrap the electrode assembly 11, causing a short circuit due to the contact of the cap assembly and the cylindrical can.
  • Patent Document 1 relates to an insulating member of a secondary battery, the insulators mounted on the top surface and the bottom surface of the jelly roll are fastened to each other through the central hollow of the jelly roll in the manufacturing process of the battery to form an integral structure, the insulator The fastening portion of these is disclosed an insulating member comprising polypropylene positioned on the upper insulator or the lower insulator.
  • Patent Document 2 relates to an insulating member for a secondary battery, a polymer member having a plate-like insulating member mounted on the top of the jelly roll inside the cylindrical battery case having fine pores that pass through the electrolyte but do not pass foreign matter larger than 100 ⁇ m size or An insulating member comprising short fibers of a polymer composite is disclosed.
  • Cylindrical batteries are becoming more widely used than previously expected, and are also used in equipment that prioritizes stability of automobiles. In addition, they have excellent stability at high temperatures and provide excellent insulation in electrode assemblies and cap assemblies. Development of the member is needed.
  • the present invention is to solve the above problems, and an object of the present invention is to provide an insulating member having excellent stability and insulation at high temperature, as well as excellent storage and workability, a manufacturing method of the insulating member and a cylindrical battery manufacturing method including the same.
  • Insulation member of the present invention for solving the above problems, the substrate made of a plate-like network structure having a plurality of glass fiber strands intersecting the gap; And a binder for coating the outer surface of the glass fiber strands.
  • the binder is preferably a silicone compound or a urethane compound.
  • the binder is preferably filled in the void portion of the substrate, and more preferably, the thickness of the binder layer filled in the void portion is relatively thicker than the thickness of the substrate.
  • the binder filled in the voids of the substrate and the binder for coating the outer surface of the glass fiber strands may be made of the same material, and if necessary, a binder filled in the voids of the substrate and The binder for coating the outer surface of the glass fiber strands may be made of different materials from each other.
  • the manufacturing method of the insulating member according to the present invention the first step of preparing a base material consisting of a plate-shaped network structure having a void by crossing a plurality of glass fiber strands in a lattice shape, by spraying a binder on the substrate glass fiber strands And a second step of coating the outer surface, a third step of drying and curing the substrate sprayed with the binder, and a fourth step of cutting the predetermined shape to complete the insulating member.
  • the manufacturing method of the insulating member according to the present invention the first step of preparing a substrate consisting of a plate-shaped network structure having a void by crossing a plurality of glass fiber strands in a lattice shape, filling the binder in the void portion of the substrate A second step, a third step of drying and curing the substrate filled with the binder, and a fourth step of cutting the predetermined shape to complete the insulating member.
  • the binder is preferably a silicone compound or a urethane compound.
  • the manufacturing method of the insulating member the first step of preparing a base material consisting of a plate-shaped network structure having a void by crossing a plurality of glass fiber strands in a lattice shape, by spraying a binder on the substrate glass fiber strands A second step of coating the outer surface, a third step of drying and curing the substrate sprayed with the binder, a fourth step of filling the binder in the void portion of the substrate, and a fifth step of drying and curing the substrate filled with the binder And a sixth step of cutting the predetermined shape to complete the insulating member, wherein the binder for coating the outer surface of the glass fiber strand and the binder filled in the gap portion of the substrate are different from each other.
  • the binder for coating the outer surface of the glass fiber strands is a silicon-based compound
  • the binder filled in the pores of the base material is preferably a urethane-based compound
  • the cutting may be carried out by the punching process.
  • the method of manufacturing a cylindrical battery according to the present invention includes the steps of preparing an insulating member, cutting the insulating member in a circular shape, storing an electrode assembly in a cylindrical can inner space, and seating the insulating member on the electrode assembly. And coupling the cap assembly to the insulating member, and sealing the cap assembly.
  • the present invention includes a cylindrical can, an electrode assembly accommodated in the cylindrical can inner space, an insulating member positioned above the electrode assembly, a cap assembly located above the insulating member, wherein the insulating member is a plurality of glass fibers
  • the cylindrical secondary battery characterized in that the silicon-based compound is filled in the substrate formed in the form of a plate-shaped network structure having the pores intersecting the strands.
  • FIG. 1 is a vertical cross-sectional view of an upper end of a cylindrical battery according to the prior art.
  • FIG. 2 is a flowchart illustrating a method of manufacturing an insulating member according to a first embodiment of the present invention.
  • FIG. 3 is a flowchart illustrating a manufacturing method of an insulating member according to a second exemplary embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an insulating member manufactured according to the manufacturing method of the first or second embodiment of the present invention.
  • FIG. 5 is a flowchart illustrating a manufacturing method of an insulating member according to a third exemplary embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating a manufacturing method of an insulating member according to a fourth exemplary embodiment of the present invention.
  • FIG. 7 is a schematic view of an insulating member manufactured according to the manufacturing method of the third or fourth embodiment of the present invention.
  • FIG. 8 is a flowchart illustrating a manufacturing method of an insulating member according to a fifth exemplary embodiment of the present invention.
  • FIG. 9 is a schematic view of an insulating member manufactured according to the manufacturing method of the fifth embodiment of the present invention.
  • FIG. 10 is a schematic view of an insulating member manufactured according to a modified embodiment of the fifth embodiment.
  • Figure 11 (a) is an insulating member manufactured according to the third embodiment, (b) is a photograph of the comparison of the fine debris particles generated during the processing of the insulating member prepared according to the prior art.
  • FIG. 13 is a conceptual diagram illustrating a modified state of the insulating member when the insulating member manufactured according to the second or fourth exemplary embodiment of the present invention absorbs an electrolyte solution.
  • FIG. 14 is a conceptual view illustrating a modified state of the insulating member when the insulating member manufactured according to the fifth embodiment of the present invention absorbs electrolyte.
  • 15 is a conceptual diagram illustrating a modified state of an insulating member when an insulating member manufactured according to a modified example of the fifth exemplary embodiment of the present invention absorbs an electrolyte solution.
  • the insulating member according to the present invention is a substrate in the form of a network structure in which a plurality of glass fiber strands are crossed to form voids, and the outer surface of the glass fiber strands is coated, filled in the voids, or the upper surface of the substrate. It comprises a binder to form a thin film on the lower surface.
  • Substrate consisting of the network structure in the present invention is composed of a plurality of glass fiber strands having a very high melting point (glass transition temperature), as well as abnormal temperature due to short-circuit or external shock, as well as temperature increase accompanying continuous charge and discharge Even if the temperature of the battery increases rapidly due to use, no melting or shrinkage of the insulating member occurs due to high temperature, thereby preventing contact between the electrode assembly and the cap assembly, and as a result, insulation inside the battery even at a high temperature. Can be secured.
  • glass transition temperature glass transition temperature
  • glass fiber is a material in which glass is drawn like a fiber and is also called fiber glass.
  • Glass fibers are made of silica, limestone, borax, etc. as raw materials, and are divided into A-glass, C-glass, E-glass, and S-glass according to their formulation.
  • A-glass is a high-alkali glass with high chemical resistance but poor electrical properties
  • E-glass has strong electrical insulation properties
  • S-glass has high tensile strength.
  • C-glass is used where special resistance to chemicals is required.
  • all of these A-glass, C-glass, E-glass, and S-glass can be used, and preferably, C-glass having excellent chemical resistance or E-glass having excellent electrical insulation.
  • the glass fiber as described above has a melting point of 500 ° C to 1,500 ° C, more preferably 500 ° C to 1,200 ° C. If the melting point is less than 500 °C, it is vulnerable to high temperature caused by the continuous charging and discharging of the battery, so that the insulation inside the battery cannot be secured due to the melting of the insulating member.On the contrary, if it exceeds 1,500 °C, the amount of energy required for the glass fiber manufacturing process This increase results in poor processability and ultimately leads to an increase in unit cost, so that the melting point of the glass fiber is preferably in the above range.
  • the binder for coating the glass fiber strands, filling the voids, or forming a thin film may be selected from the group consisting of silicone resins, epoxy resins, and urethane resins, but Preference is given to resins and / or urethane resins.
  • a phenol resin and glass fiber have been used as an insulating member for preventing insulation between the electrode assembly and the cap assembly to secure insulation. That is, when the phenolic resin is impregnated with glass fibers, the strength of the insulating member is increased to have the property of not bending or folding, thereby preventing the electrode assembly from being deformed.
  • the insulating member is manufactured by impregnating the glass fiber into the phenolic resin as described above, the hardness of the insulating member is excessively increased and becomes too stiff so that it is difficult to wind and store it in a roll shape, and in particular, a cutting step of cutting to a desired size Because of the large number of fine debris of the insulating member in the short circuit due to the contamination of the electrode assembly inside the battery cell and the damage of the separator in the electrode due to these problems has been pointed out as a continuous problem.
  • the electrode assembly has an advantage in that a short risk due to contamination or damage to the separator in the electrode can be largely prevented. In addition, it is possible to ensure excellent insulation and excellent adhesion to glass fiber strands.
  • the resin mainly contains silicone
  • the resin is not particularly limited and may be, for example, silicone rubber.
  • the content of the silicone resin according to the present invention is 10 to 50 parts by weight, preferably 20 to 40 parts by weight, more preferably 25 to 35 parts by weight based on 100 parts by weight of the network structure substrate.
  • the content of the silicone resin is less than 10 parts by weight, not only a lot of fine debris is generated during the punching process, but also the holding force and adhesion of the glass fiber strands are drastically lowered. Since it becomes thick, it is preferable to use the content of silicone resin in the said range.
  • a urethane resin can also be used as said binder.
  • urethane resin When urethane resin is applied and dried as an insulating member on a substrate made of a network structure in which glass fiber strands are crossed, the urethane resin absorbs electrolyte and expands to a predetermined volume. It is larger than size. Due to the increased volume, it is deformed or expands in a vertical direction while forming a pleat on the side, and the deformed structure can securely space the space between the electrode assembly and the cap assembly, thereby providing more insulation. .
  • a method of manufacturing a cylindrical battery using the insulating member prepared as described above may include: cutting the insulating member into a circular shape, accommodating the electrode assembly in a cylindrical can inner space, and seating the insulating member on the electrode assembly. And coupling the cap assembly to the insulating member, and sealing the cap assembly.
  • the battery of the present invention is not particularly limited in kind, for example, lithium ion (Li-ion) battery, lithium polymer (Li-polymer) battery having advantages such as high energy density, discharge voltage, output stability, Or a lithium battery such as a lithium-ion polymer battery.
  • lithium ion (Li-ion) battery lithium polymer (Li-polymer) battery having advantages such as high energy density, discharge voltage, output stability,
  • a lithium battery such as a lithium-ion polymer battery.
  • a lithium battery is composed of a positive electrode, a negative electrode, a separator, and a lithium salt-containing nonaqueous electrolyte.
  • the positive electrode is manufactured by, for example, applying a mixture of a positive electrode active material, a conductive material, and a binder on a positive electrode current collector and / or an extension current collector, and then drying the composition, and optionally adding a filler to the mixture. do.
  • the positive electrode current collector and / or the extension current collector is generally made to a thickness of 3 to 500 micrometers.
  • the positive electrode current collector and the extension current collector are not particularly limited as long as they have high conductivity without causing chemical change in the battery.
  • stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum Surface treated with carbon, nickel, titanium, silver or the like on the surface of the stainless steel may be used.
  • the positive electrode current collector and the extension current collector may form fine irregularities on the surface thereof to increase adhesion of the positive electrode active material, and may be in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.
  • the conductive material is typically added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material.
  • a conductive material is not particularly limited as long as it has conductivity without causing chemical change in the battery, and examples thereof include graphite such as natural graphite and artificial graphite; Carbon blacks such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder and nickel powder; Conductive whiskeys such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.
  • the binder is a component that assists the bonding of the active material and the conductive material to the current collector, and is generally added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material.
  • binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.
  • the filler is optionally used as a component for inhibiting expansion of the positive electrode, and is not particularly limited as long as it is a fibrous material without causing chemical change in the battery.
  • the filler include olefin polymers such as polyethylene and polypropylene; Fibrous materials, such as glass fiber and carbon fiber, are used.
  • the negative electrode is manufactured by coating and drying a negative electrode active material on a negative electrode current collector and / or an extension current collector, and optionally, the components as described above may be further included if necessary.
  • the negative electrode current collector and / or the extension current collector is generally made to a thickness of 3 to 500 micrometers.
  • Such a negative electrode current collector and / or an extension current collector is not particularly limited as long as it has conductivity without causing chemical change in the battery.
  • copper, stainless steel, aluminum, nickel, titanium, calcined carbon, Surface treated with carbon, nickel, titanium, silver, or the like on the surface of copper or stainless steel, aluminum-cadmium alloy, and the like can be used.
  • fine concavities and convexities may be formed on the surface to enhance the bonding strength of the negative electrode active material, and may be used in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.
  • carbon such as hardly graphitized carbon and graphite type carbon
  • the separator is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used.
  • the pore diameter of the separator is generally from 0.01 to 10 micrometers, the thickness is generally from 5 to 300 micrometers.
  • olefin polymers such as chemical resistance and hydrophobic polypropylene; Sheets or non-woven fabrics made of glass fibers or polyethylene are used.
  • a solid electrolyte such as a polymer
  • the solid electrolyte may also serve as a separator.
  • the electrolyte may be a lithium salt-containing non-aqueous electrolyte, and consists of a non-aqueous electrolyte and a lithium salt.
  • nonaqueous electrolyte nonaqueous organic solvents, organic solid electrolytes, inorganic solid electrolytes, and the like are used, but not limited thereto.
  • non-aqueous organic solvent examples include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, and gamma Butyl lactone, 1,2-dimethoxy ethane, tetrahydroxy franc, 2-methyl tetrahydrofuran, dimethyl sulfoxide, 1,3-dioxorone, formamide, dimethylformamide, dioxolon , Acetonitrile, nitromethane, methyl formate, methyl acetate, phosphate triester, trimethoxy methane, dioxorone derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbo Aprotic organic solvents such as nate derivatives, tetrahydrofuran derivatives, ethers, methyl pyroionate and ethyl propionate can be
  • organic solid electrolyte examples include polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphate ester polymers, polyedgetion lysine, polyester sulfides, polyvinyl alcohols, polyvinylidene fluorides, Polymers containing ionic dissociating groups and the like can be used.
  • Examples of the inorganic solid electrolyte include Li 3 N, LiI, Li 5 NI 2 , Li 3 N-LiI-LiOH, LiSiO 4 , LiSiO 4 -LiI-LiOH, Li 2 SiS 3 , Li 4 SiO 4 , Nitrides, halides, sulfates and the like of Li, such as Li 4 SiO 4 -LiI-LiOH, Li 3 PO 4 -Li 2 S-SiS 2 , and the like, may be used.
  • the lithium salt is a good material to be dissolved in the non-aqueous electrolyte, for example, LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6, LiSbF 6, LiAlCl 4, CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide have.
  • pyridine triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexaphosphate triamide, Nitrobenzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyrroles, 2-methoxy ethanol, aluminum trichloride and the like may be added.
  • pyridine triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexaphosphate triamide
  • Nitrobenzene derivatives sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyr
  • a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further included, and carbon dioxide gas may be further included to improve high temperature storage characteristics, and FEC (Fluoro-Ethylene) may be further included. Carbonate), PRS (Propene sultone) may be further included.
  • lithium salts such as LiPF 6 , LiClO 4 , LiBF 4 , LiN (SO 2 CF 3 ) 2, and the like, may be prepared by cyclic carbonate of EC or PC, which is a highly dielectric solvent, and DEC, DMC, or EMC, which are low viscosity solvents.
  • Lithium salt-containing non-aqueous electrolytes can be prepared by adding them to a mixed solvent of linear carbonates.
  • the insulating member according to the first embodiment of the present invention comprises the steps of preparing a substrate made of a plate-like network structure having voids by crossing a plurality of glass fiber strands in a lattice shape, and spraying a binder on the substrate to coat the outer surface of the glass fiber strands. And drying the substrate sprayed with the binder, and cutting the substrate into a predetermined shape to complete the insulating member.
  • the insulating member 100 manufactured is coated with a silicone rubber, which is a binder 120, on the surfaces of the plurality of glass strands 110, as shown in FIG. Fine pores having a predetermined size are formed between the glass strands.
  • micropores are formed in the insulating member 100 as described above may contribute to the unexpected explosion of the battery.
  • the secondary battery has a swelling phenomenon in which the case swells due to the generation of gas such as carbon dioxide or carbon monoxide in the battery due to various causes such as repeated charging and discharging, overcharging, or short circuit, but the insulating member 100 of the present invention. It is possible to reduce the risk of explosion because it is equipped with a number of fine pores can be moved to the cap assembly through these pores.
  • the outer surface of the glass fiber strands may be coated, but a known method may be used as a means for forming micropores therebetween.
  • a predetermined pressure may be applied after a predetermined time after spraying the silicone rubber using a spray.
  • By spraying air into the silicone rubber between the relatively weak bonding glass fiber strands may be formed or fine pores.
  • FIG. 3 is a flowchart illustrating a manufacturing method of an insulating member according to a second exemplary embodiment of the present invention.
  • the insulating member according to the second embodiment of the present invention comprises the steps of: preparing a substrate made of a plate-shaped network structure having voids by crossing a plurality of glass fiber strands in a lattice shape, and spraying a urethane resin as a binder on the substrate to Coating the surface, drying the substrate sprayed with the urethane resin, and cutting into a predetermined shape to complete the insulating member.
  • Example 1 the silicone rubber is used as the binder, whereas in Example 2, the same as that of the urethane resin is used, and the finally prepared insulating member 100 is similarly plural as shown in FIG.
  • the urethane resin is coated on the surface of the glass strand 110 as a binder 120, and fine pores having a predetermined size are formed between the glass strands.
  • the insulating member according to the third embodiment of the present invention comprises preparing a substrate made of a plate-shaped network structure having voids by crossing a plurality of glass fiber strands in a lattice shape, and filling the silicon rubber as a binder in the void portion of the substrate. 2, a third step of drying and curing the base material filled with silicone rubber, and a fourth step of cutting the predetermined shape to complete the insulating member, the schematic diagram of the insulating member obtained by such a manufacturing method is shown in FIG. Same as
  • the meaning that the silicon fibers are filled in the pores 130 between the glass fiber strands 110 is not only filled between the pores 130, but also when the film is formed on the upper and / or lower surfaces of the substrate to a predetermined thickness. It includes.
  • the insulating member according to the fourth embodiment includes preparing a substrate made of a plate-shaped network structure having pores by crossing a plurality of glass fiber strands in a lattice shape, and filling a urethane resin as a binder in the pores of the substrate. , Drying the substrate filled with the urethane resin, and cutting into a predetermined shape to complete the insulating member.
  • Example 3 a silicone rubber is used as the binder, whereas in Example 4, the same as that of the urethane resin is used, and the finally prepared insulating member 100 is similarly plural as shown in FIG. Urethane resin is filled between the glass strands 110 as a binder 120.
  • the insulating member according to the fifth embodiment of the present invention comprises preparing a substrate made of a plate-shaped network structure having voids by crossing a plurality of glass fiber strands in a lattice shape, and spraying silicon rubber as a binder on the substrate to form a glass fiber strand. Coating the surface, drying the substrate sprayed with silicone rubber, filling the urethane resin in the void portion of the substrate, drying and curing the substrate filled with the urethane resin, and cutting to a predetermined shape to insulate And completing the member.
  • Schematic diagram of the insulating member manufactured according to the fifth embodiment is as shown in Figure 9, the outer surface of the glass fiber strand 110 is coated with a silicone rubber 121 and the void 130 is filled with a urethane resin.
  • Figure 9 (a) is a case where the urethane resin does not form a coating on the upper and lower surfaces of the substrate
  • Figure 9 (b) is a schematic diagram showing that the urethane resin can form a thin film on the upper and lower surfaces of the substrate.
  • the insulating member according to the fifth embodiment of the present invention has the advantage that the bulk expansion of the urethane resin can be expected at the same time while ensuring the flexibility by the embodiment cone rubber.
  • FIG. 10 is a schematic view of an insulating member manufactured according to a modified embodiment of the fifth embodiment.
  • the diameter of the glass fiber strand 110 is located at the edge is relatively smaller than the glass fiber strand 110 is located in the central portion may have a different thickness.
  • the diameter of the glass fiber strand 110 is the same, but it is also possible to manufacture by varying the amount of the urethane resin 122 is applied to the upper and lower substrates.
  • the tensile strength of the insulating member prepared according to the manufacturing method of Example 3 filled with a silicone rubber on a substrate made of a plate-shaped network structure of glass fiber strands Measured.
  • the insulating member was prepared using the phenol resin instead of silicone rubber for the base material of the plate-shaped network structure of the same glass fiber strand.
  • Specimens for the test were prepared by cutting 2cm wide and 8.5cm long, and measured the tensile strength under the conditions of the measurement speed 100mm / min using a UTM (Universal Testing Machine).
  • the tensile strength of the insulating member prepared according to the present invention is 81.8N / mm 2 It is easy to bend and can be stored in the form of rolls, while using the phenol resin of Comparative Example 1 It can be seen that one insulating member cannot be bent and stored in roll form because it has a remarkably high tensile strength which cannot be measured.
  • Comparative Example 2 an insulating member using a phenol resin instead of silicone rubber was cut to the substrate of the same glass fiber strand plate-like network structure.
  • Figure 11 (a) is an insulating member produced according to the present invention
  • (b) is a comparison picture results by the fine debris particles generated when cutting the insulating member prepared according to the comparative example.
  • the insulating member of the present invention has no fine debris particles observed, whereas the insulating member of Comparative Example 2 shows that a large amount of fine debris particles are generated. It can be expected that the constituting structures have a high risk of contamination.
  • the TGA of the insulating member prepared according to the manufacturing method of Example 3, in which a silicone rubber was filled in a substrate made of a plate-shaped network structure of glass fiber strands was analyzed.
  • TGA was also analyzed together with an insulating member using a phenol resin instead of silicone rubber for the substrate of the same glass fiber strand as the comparative example 3-1, and an insulating plate substrate made of polyethylenetelephtalate (PET) as the comparative example 3-2.
  • PET polyethylenetelephtalate
  • the insulation member according to the present invention has a mass loss of 13.4% as a result of TGA analysis, but the insulation member of Comparative Example 3-1 in which phenol resin is applied without silicone rubber is applied It can be seen that 40.5%, which is three times more than the insulating member, and Comparative Example 3-2, which is a PET insulating plate substrate, are completely burned.
  • the urethane resin included in the insulating member has a property of expanding when it meets the electrolyte
  • the urethane resin is larger than the size corresponding to the horizontal cross section of the cylindrical can housing.
  • the wrinkles may be deformed by the enlarged area, and the deformed structure may further space the space between the electrode assembly and the cap assembly, thereby further securing insulation.
  • the insulating member may meet the electrolyte and may extend in the range of 100% to 150% of the existing length.
  • the insulating member may be partially contracted at a high temperature. If the length of the insulating member exceeds 150% of the existing length, it may not be accommodated in the space between the electrode assembly and the cap assembly due to the excessive length of the insulating member. As a result, the insulating member may be twisted or broken by the shear force, so it is preferable to extend the range.
  • the silicone rubber contained in the insulating member does not expand even when it meets the electrolyte, but the urethane resin expands in the vertical direction of the cylindrical can housing because the urethane resin has the property of expanding when it meets the electrolyte.
  • the increased volume allows the space between the electrode assembly and the cap assembly to be spaced apart from each other to ensure insulation, and also has the advantage of excellent storage and processability due to the flexibility of the silicone resin.
  • the urethane resin is filled in the pores, and the thickness of the insulating member is different (see the modified example of Example 5 and FIG. 10). Similar to 5, the outer shape may be changed to the center of the portion where the urethane resin in contact with the electrolyte is located.
  • the silicone rubber included in the insulating member does not expand even when it meets the electrolyte, but the urethane resin expands in the vertical direction of the cylindrical can housing because the urethane resin has the property of expanding when it meets the electrolyte.
  • the thickness of the center portion is relatively thicker than the edge, the space portion expands between the large electrode assembly and the cap assembly, thereby improving impact resistance.
  • an insulating member made of glass fiber having a high melting point is included, and thus, even when the temperature of the battery is increased, no melting or shrinkage of the insulating member occurs due to the high temperature, so that the insulating property is stable even at a high temperature. Can be secured
  • the insulating member coated with a silicon-containing binder can be wound and rolled in a roll state because the hardness thereof does not increase, and dust blowing does not occur during cutting, thereby minimizing the formation of impurities in the manufacturing step. can do.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)

Abstract

La présente invention concerne un élément isolant, un procédé de fabrication d'un élément isolant, et un procédé de fabrication d'une batterie cylindrique comprenant un élément isolant. Plus particulièrement, la présente invention concerne un élément isolant, un procédé de fabrication d'un élément isolant, et un procédé de fabrication d'une batterie cylindrique comprenant un élément isolant, l'élément isolant étant caractérisé en ce qu'il comprend : un substrat comprenant de multiples brins de fibre de verre se croisant les uns les autres de telle sorte que le substrat est conçu sous la forme d'une structure maillée en forme de plaque comportant des parties poreuses ; et un liant dont sont revêtues les surfaces externes des brins de fibre de verre.
PCT/KR2018/004761 2017-04-27 2018-04-24 Élément isolant, procédé de fabrication d'un élément isolant, et procédé de fabrication d'une batterie cylindrique comprenant un élément isolant WO2018199604A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2019526518A JP6879491B2 (ja) 2017-04-27 2018-04-24 絶縁部材、絶縁部材の製造方法及び前記絶縁部材を含む円筒形電池の製造方法
CN201880005811.7A CN110168793B (zh) 2017-04-27 2018-04-24 绝缘构件、制造该绝缘构件的方法以及制造包括该绝缘构件的圆柱形电池的方法
EP18791914.7A EP3618159B1 (fr) 2017-04-27 2018-04-24 Élément isolant, procédé de fabrication d'un élément isolant, et procédé de fabrication d'une batterie cylindrique comprenant un élément isolant
US16/490,254 US20200013998A1 (en) 2017-04-27 2018-04-24 Insulation Member, Method of Manufacturing the Insulation Member, and Method of Manufacturing Cylindrical Battery Comprising the Insulation Member

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20170054247 2017-04-27
KR10-2017-0054247 2017-04-27
KR10-2018-0047588 2018-04-24
KR1020180047588A KR102172059B1 (ko) 2017-04-27 2018-04-24 절연 부재, 절연 부재의 제조방법 및 상기 절연 부재를 포함하는 원통형 전지의 제조방법

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113169420A (zh) * 2018-11-28 2021-07-23 卡尔·弗罗伊登伯格公司 电化学的蓄能单元
US20210280336A1 (en) * 2018-07-26 2021-09-09 3M Innovative Properties Company Flame resistant materials for electric vehicle battery applications

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Publication number Priority date Publication date Assignee Title
JPH11144529A (ja) * 1997-11-05 1999-05-28 Marusei Kk 絶縁シ−ト
JP2002088626A (ja) * 2000-09-20 2002-03-27 Shin Kobe Electric Mach Co Ltd 積層板用ガラス繊維不織布及びコンポジット積層板
KR100719729B1 (ko) * 2005-12-29 2007-05-17 삼성에스디아이 주식회사 리튬 이차전지
JP2008027635A (ja) * 2006-07-19 2008-02-07 Matsushita Electric Ind Co Ltd 電気化学素子
KR101154882B1 (ko) 2007-05-11 2012-06-18 주식회사 엘지화학 전지의 안전성을 향상시키는 절연부재를 포함하고 있는이차전지
KR20130004075A (ko) 2011-06-30 2013-01-09 주식회사 엘지화학 미세 기공들이 형성된 절연부재를 포함하는 이차전지

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Publication number Priority date Publication date Assignee Title
JPH11144529A (ja) * 1997-11-05 1999-05-28 Marusei Kk 絶縁シ−ト
JP2002088626A (ja) * 2000-09-20 2002-03-27 Shin Kobe Electric Mach Co Ltd 積層板用ガラス繊維不織布及びコンポジット積層板
KR100719729B1 (ko) * 2005-12-29 2007-05-17 삼성에스디아이 주식회사 리튬 이차전지
JP2008027635A (ja) * 2006-07-19 2008-02-07 Matsushita Electric Ind Co Ltd 電気化学素子
KR101154882B1 (ko) 2007-05-11 2012-06-18 주식회사 엘지화학 전지의 안전성을 향상시키는 절연부재를 포함하고 있는이차전지
KR20130004075A (ko) 2011-06-30 2013-01-09 주식회사 엘지화학 미세 기공들이 형성된 절연부재를 포함하는 이차전지

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210280336A1 (en) * 2018-07-26 2021-09-09 3M Innovative Properties Company Flame resistant materials for electric vehicle battery applications
CN113169420A (zh) * 2018-11-28 2021-07-23 卡尔·弗罗伊登伯格公司 电化学的蓄能单元

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