WO2022220304A1 - バッテリーハウジング - Google Patents

バッテリーハウジング Download PDF

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Publication number
WO2022220304A1
WO2022220304A1 PCT/JP2022/018081 JP2022018081W WO2022220304A1 WO 2022220304 A1 WO2022220304 A1 WO 2022220304A1 JP 2022018081 W JP2022018081 W JP 2022018081W WO 2022220304 A1 WO2022220304 A1 WO 2022220304A1
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WIPO (PCT)
Prior art keywords
fiber
battery housing
fibers
high heat
battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/018081
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English (en)
French (fr)
Japanese (ja)
Inventor
晃啓 矢野
英之 志楽
一憲 河原
信暁 ▲高▼田
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Mitsubishi Chemical Corp
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Mitsubishi Chemical Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Chemical Corp filed Critical Mitsubishi Chemical Corp
Priority to EP22788227.1A priority Critical patent/EP4324875B1/en
Priority to JP2023514691A priority patent/JPWO2022220304A1/ja
Priority to US18/286,676 priority patent/US20240194993A1/en
Priority to CN202280027193.2A priority patent/CN117157813A/zh
Publication of WO2022220304A1 publication Critical patent/WO2022220304A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
    • C08J5/043—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with glass fibres
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/229—Composite material consisting of a mixture of organic and inorganic materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/047—Reinforcing macromolecular compounds with loose or coherent fibrous material with mixed fibrous material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/10—Reinforcing macromolecular compounds with loose or coherent fibrous material characterised by the additives used in the polymer mixture
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
    • C08J5/247—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using fibres of at least two types
    • 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
    • H01M50/121—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
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/202—Casings or frames around the primary casing of a single cell or a single battery
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/222—Inorganic 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/227—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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/231—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H01M50/293—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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

Definitions

  • the present invention relates to battery housings.
  • Patent Document 1 a carbon fiber reinforced polypropylene resin composition obtained by blending 8 to 70 parts by weight of carbon fiber and 0.6 to 37.5 parts by weight of a flame retardant with respect to 100 parts by weight of polypropylene resin
  • a battery case for a vehicle has been proposed, which is formed by molding an article, and is characterized in that the carbon fiber in the molded article has a weight average fiber length of 0.5 mm or more and less than 3 mm.
  • the present invention is a fiber-reinforced resin product that can delay the spread of fire to automobile interior parts when thermal runaway of the battery occurs and flames occur, and has excellent flame-shielding properties.
  • An object of the present invention is to provide a battery housing.
  • a battery housing using a fiber reinforced resin containing at least inorganic fibers having a melting temperature or a burnout temperature exceeding 1000 ° C. in an air atmosphere is the above-mentioned battery housing.
  • the problem can be solved, and have completed the present invention based on these findings. That is, the present invention provides the following [1] to [12].
  • a battery housing made of a fiber-reinforced resin which includes a high heat-resistant fiber A having a melting temperature or a burn-out temperature of more than 1000 ° C. in an air atmosphere, and a melting temperature or a burn-out temperature higher than that of the high heat-resistant fiber A.
  • the high heat-resistant fibers A have an average fiber diameter of 3 to 25 ⁇ m and an average fiber length of 5 mm or more.
  • An electric mobility comprising the structure according to any one of [9] to [11] above.
  • a battery housing that can delay the spread of fire to automobile interior members when thermal runaway occurs in the battery and flames are generated, and that has superior flame-shielding properties.
  • FIG. 1 is a schematic diagram showing a stampable sheet of Example 1.
  • FIG. 1 is a schematic diagram showing a stampable sheet of Example 1.
  • FIG. 1 is a conceptual diagram showing a structure such as a battery including a battery housing.
  • a structure 10 such as a battery includes, for example, a battery module 11 that is an assembly of battery cells (battery units), a battery pack 12 that is an assembly of battery modules, and a battery housing for housing battery members such as the battery pack. 13.
  • the battery housing of the present invention is made of a fiber-reinforced resin, and the fibers include a high heat-resistant fiber A having a melting temperature or a burn-out temperature of more than 1000°C in an air atmosphere, and a lower melting temperature or a burn-out temperature than the high heat-resistant fiber A. It is characterized by including an inorganic fiber B (hereinafter sometimes simply referred to as "inorganic fiber B").
  • the fibers in the fiber-reinforced resin according to the present invention may be organic fibers or inorganic fibers, but inorganic fibers are preferable from the viewpoint of heat resistance.
  • These inorganic fibers may be used singly or in combination of two or more.
  • the present invention is characterized in that the fiber includes a high heat-resistant fiber A having a melting temperature or a burn-out temperature exceeding 1000° C. in an air atmosphere.
  • highly heat-resistant fibers include alumina fibers, potassium titanate fibers, silica-alumina fibers, alkaline earth silicate fibers (biologically soluble), basalt fibers, etc.
  • alumina fibers are particularly preferred.
  • High heat-resistant fibers can be used singly or in combination of two or more.
  • the fibers include inorganic fibers B having a lower melting temperature or burnout temperature than the high heat-resistant fibers A. By containing two or more kinds of fibers having different melting temperatures or burnout temperatures in the atmosphere, the high heat-resistant fibers A can be prevented from breaking, and functional deterioration of the high heat-resistant fibers A can be prevented.
  • the content of the high heat resistant fiber A is preferably 1 part by mass or more, more preferably 3 parts by mass or more, and even more preferably 5 parts by mass or more with respect to 100 parts by mass of the fiber reinforced resin.
  • the upper limit is preferably 20 parts by mass or less, more preferably 15 parts by mass or less, and even more preferably 10 parts by mass or less. When it is at least the above lower limit, sufficient flame-shielding properties and rigidity can be obtained, and when it is at most the above upper limit, workability is ensured.
  • the fiber of the present invention must contain the high heat resistant fiber A as described above, and must contain the inorganic fiber B having a lower melting temperature or burnout temperature than the high heat resistant fiber A.
  • the inorganic fibers B are preferably glass fibers, and the fibers in the present invention particularly preferably include alumina fibers and glass fibers.
  • the mass ratio (inorganic fiber B/high heat resistant fiber A) to high heat resistant fiber A is more than 1 to 8 and preferably in the range of 2 to 6.
  • the high heat-resistant fiber A such as alumina fiber and the inorganic fiber B such as glass fiber may be contained in the fiber reinforced resin, and the mat of high heat-resistant fiber A such as alumina fiber and glass fiber described in detail later A sheet-like product obtained by laminating a mat of inorganic fibers B such as B and impregnating the mat with a resin may also be used.
  • the fibers used in the present invention may be used in combination with a sizing agent or surface treatment agent.
  • a sizing agent or surface treatment agent include compounds having functional groups such as epoxy compounds, silane compounds and titanate compounds.
  • the fibers of the present invention contain high heat-resistant fibers A and inorganic fibers B, and the average fiber diameter of at least one type of fiber is preferably 3 to 25 ⁇ m, and the average fiber length is preferably 5 mm or more. .
  • the average fiber diameter and average fiber length of the highly heat resistant fibers A are preferably within the above ranges.
  • the average fiber length of the inorganic fibers B is preferably longer than the average fiber length of the high heat resistant fibers A.
  • the fiber diameter can be measured using an optical microscope or the like, and the average fiber diameter can be obtained by, for example, randomly measuring the fiber diameters of 10 fibers and calculating the average value.
  • the fiber length can be measured using a ruler, vernier caliper, or the like from an image magnified with a microscope or the like, if necessary. It can be obtained by calculating the value.
  • the fiber content in the fiber-reinforced resin of the present invention is preferably 3 to 60% by mass.
  • the fiber content is 3% by mass or more, the strength, rigidity, and impact resistance of the battery housing can be ensured.
  • the content is 60% by mass or less, the battery housing can be easily manufactured and processed.
  • the specific gravity becomes light, and there is an advantage that the weight reduction effect as a metal substitute is large.
  • the content of fibers in the fiber-reinforced resin is more preferably 10 to 50% by mass, and even more preferably 30 to 45% by mass.
  • the term "fiber" as used herein includes the high heat-resistant fiber A and the inorganic fiber B described above.
  • the resin constituting the fiber-reinforced resin of the present invention is not particularly limited, but may be a thermoplastic resin.
  • the thermoplastic resin is not particularly limited, and includes polyolefin resins such as polyethylene and polypropylene, polyvinyl chloride, polystyrene, polyvinyl acetate, polyurethane, and the like. Among these resins, polyolefin resins are preferable, and polypropylene-based resins are particularly preferable, from the viewpoint of resin physical properties, versatility, cost, and the like.
  • polypropylene resin examples include propylene homopolymers and propylene- ⁇ -olefin copolymers.
  • the propylene- ⁇ -olefin copolymer may be either a random copolymer or a block copolymer.
  • the content of the thermoplastic resin in the battery housing of the present invention is preferably 20-80% by mass.
  • the content of the thermoplastic resin is 20% by mass or more, the moldability is sufficient, and the molding of the battery housing becomes easy.
  • the content of the thermoplastic resin in the battery housing is preferably 35-70% by mass, more preferably 40-60% by mass.
  • colorants such as pigments, light stabilizers such as hindered amines, UV absorbers such as benzotriazole, nucleating agents such as sorbitol, antioxidants such as phenols and phosphorus, and nonionic Antistatic agents such as surfactants, neutralizers such as inorganic compounds, antibacterial/antifungal agents such as thiazoles, flame retardants such as halogen compounds, plasticizers, dispersants such as organic metal salts, fatty acid amides, etc.
  • UV absorbers such as benzotriazole
  • nucleating agents such as sorbitol
  • antioxidants such as phenols and phosphorus
  • nonionic Antistatic agents such as surfactants, neutralizers such as inorganic compounds, antibacterial/antifungal agents such as thiazoles, flame retardants such as halogen compounds, plasticizers, dispersants such as organic metal salts, fatty acid amides, etc.
  • nonionic Antistatic agents such as surfactants, neutralizers such as in
  • Lubricants metal deactivators such as nitrogen compounds, polyolefin resins other than the polypropylene resins, thermoplastic resins such as polyamide resins and polyester resins, elastomers (rubber components) such as olefin elastomers and styrene elastomers, etc. can be done. These optional additive components may be used in combination of two or more.
  • inorganic or organic pigments are used to impart or improve the colored appearance, appearance, texture, commercial value, weather resistance, durability, etc. of the polypropylene resin composition and its molded product. It is valid.
  • specific examples of inorganic pigments include carbon black such as furnace carbon and ketjen carbon; titanium oxide; iron oxide (red iron oxide, etc.); chromic acid (chrome, etc.); molybdic acid;
  • organic pigments include sparingly soluble azo lakes, soluble azo lakes, insoluble azo chelates; condensable azo chelates; azo pigments such as other azo chelates; phthalocyanine pigments such as phthalocyanine blue and phthalocyanine green; threne-based pigments such as thioindigo; dye lakes; quinacridone-based; dioxazine-based;
  • aluminum flakes and pearl pigments can be incorporated to give a metallic tone or a pearly tone.
  • a dye can also be contained.
  • Hindered amine compounds, benzotriazole-based, benzophenone-based, and salicylate-based light stabilizers and UV absorbers are effective in imparting and improving the weather resistance and durability of polypropylene resin compositions and their moldings. , is effective in further improving weather discoloration resistance.
  • hindered amine compounds include condensation products of dimethyl succinate and 1-(2-hydroxyethyl)-4-hydroxy-2,2,6,6-tetramethylpiperidine; poly[[6-(1, 1,3,3-tetramethylbutyl)imino-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidyl)imino]hexamethylene[(2 , 2,6,6-tetramethyl-4-piperidyl)imino]]; tetrakis(2,2,6,6-tetramethyl-4-piperidyl) 1,2,3,4-butanetetracarboxylate; tetrakis( 1,2,2,6,6-pentamethyl-4-piperidyl) 1,2,3,4-butane tetracarboxylate; bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate; bis -2,2,6,6-tetramethyl-4-piperidyl)
  • salicylates examples include 4-t-butylphenyl salicylate; 2,4-di-t-butylphenyl 3′,5′-di-t -Butyl-4'-hydroxybenzoate and the like.
  • the method of using the light stabilizer and the ultraviolet absorber in combination is preferable because it has a large effect of improving weather resistance, durability, weather discoloration resistance, and the like.
  • antioxidants for example, phenol-based, phosphorus-based, and sulfur-based antioxidants provide and improve heat resistance stability, processing stability, heat aging resistance, etc. of polypropylene resin compositions and molded articles thereof.
  • effective for As antistatic agents for example, nonionic and cationic antistatic agents are effective in imparting and improving antistatic properties to polypropylene resin compositions and molded articles thereof.
  • olefinic elastomers examples include ethylene/propylene copolymer elastomer (EPR), ethylene/butene copolymer elastomer (EBR), ethylene/hexene copolymer elastomer (EHR), ethylene/octene copolymer elastomer (EOR ) and other ethylene/ ⁇ -olefin copolymer elastomers; Examples thereof include original copolymer elastomers, styrene/butadiene/styrene triblock copolymer elastomers (SBS), and the like.
  • EPR ethylene/propylene copolymer elastomer
  • EBR ethylene/butene copolymer elastomer
  • EHR ethylene/hexene copolymer elastomer
  • EOR ethylene/octene copolymer
  • SBS styrene/butadiene/sty
  • styrene-based elastomers examples include styrene/isoprene/styrene triblock copolymer elastomer (SIS), styrene-ethylene/butylene copolymer elastomer (SEB), and styrene-ethylene/propylene copolymer elastomer (SEP).
  • SIS styrene/isoprene/styrene triblock copolymer elastomer
  • SEB styrene-ethylene/butylene copolymer elastomer
  • SEP styrene-ethylene/propylene copolymer elastomer
  • styrene-ethylene-butylene-styrene copolymer elastomer SEBS
  • SEBC styrene-ethylene-butylene-ethylene copolymer elastomer
  • HBR hydrogenated styrene-butadiene elastomer
  • SEPS styrene-ethylene-propylene-styrene copolymer
  • SEEPS styrene-butadiene/butylene-styrene copolymer
  • SBBS partially hydrogenated styrene-isoprene-styrene copolymer elastomer , partially hydrogenated styrene-isoprene-butadiene-styrene copolymer elastomers, and hydrogenated
  • the polypropylene-based resin composition of the present invention and its molded article can be imparted with appropriate flexibility. It is preferable from the viewpoint that it is easy to apply and tends to have excellent impact resistance.
  • the thickness of the battery housing of the present invention is not particularly limited, but is preferably 0.5 mm or more, more preferably 1.0 mm or more, and even more preferably 2.0 mm or more. When it is at least the above lower limit, it is preferable from the points of formability, mechanical strength, and flame-shielding properties. Also, the thickness of the battery housing is preferably 10 mm or less, more preferably 8 mm or less, and particularly preferably 6 mm or less. It is preferable that the thickness is equal to or less than the above upper limit, because it is easy to adapt to the size of the space in which it is installed, and from the viewpoint of weight reduction and moldability.
  • ⁇ Manufacturing method of battery housing> Various methods can be used as the method for manufacturing the battery housing of the present invention, but press molding is preferable from the viewpoint of productivity.
  • press molding it is preferable to prepare a stampable sheet made of the fiber-reinforced resin of the present invention, stack a plurality of sheets, and press mold. It is preferable that the stampable sheet containing the highly heat-resistant fibers is sandwiched between other stampable sheets from both sides so that the highly heat-resistant fibers can easily flow over the entire sheet.
  • stampable sheet containing the highly heat-resistant fibers is sandwiched between other stampable sheets from both sides so that the highly heat-resistant fibers can easily flow over the entire sheet.
  • stampable sheet containing the highly heat-resistant fibers it is preferable to stack them in the center as much as possible.
  • the stampable sheet is preferably produced by impregnating a fiber mat with a thermoplastic resin composition.
  • a method of impregnation a method of applying the thermoplastic resin composition to a fiber mat such as an inorganic fiber mat, a method of preparing a sheet of the thermoplastic resin composition, laminating the sheet on the fiber mat, heating and melting.
  • a method of impregnating with from the viewpoint of surface smoothness of the stampable sheet, a method of laminating a thermoplastic resin sheet on a fiber mat and heating and melting is preferred. In particular, it can be obtained by laminating a fiber mat between two thermoplastic resin sheets, then heating and pressurizing the laminate, and then cooling and solidifying it.
  • the thermoplastic resin composition contains a thermoplastic resin, optional additives, and the like, excluding the fibers.
  • a manufacturing method a conventionally known method can be used, and the composition can be manufactured by blending, mixing, and melt-kneading the above components.
  • Mixing is performed using a mixer such as a tumbler, V blender, ribbon blender, etc.
  • Melt kneading is performed using equipment such as a single screw extruder, a twin screw extruder, a Banbury mixer, a roll mixer, a Brabender plastograph, a kneader, etc. , melt-kneaded and granulated.
  • the form of the fibers used in the stampable sheet manufacturing method is not particularly limited, and various forms can be used, but those formed in a mat-like or sheet-like form are preferred. More specifically, in the present invention, it is preferable to use a mat formed of highly heat-resistant fibers typified by alumina fibers (hereinafter referred to as “highly heat-resistant fiber mat”). , a mat formed of glass fiber (hereinafter referred to as “glass fiber mat”) is preferably used.
  • the basis weight (mass per unit area) of the fiber mat is not particularly limited and is appropriately determined according to the application, but is preferably 300 g/m 2 or more, more preferably more than 500 g/m 2 , and more preferably. is greater than 700 g/m 2 , more preferably greater than 900 g/m 2 and particularly preferably greater than 1000 g/m 2 .
  • the basis weight of the fiber mat is not particularly limited, but is preferably 5,000 g/m 2 or less, more preferably 4,500 g/m 2 or less, still more preferably 4,000 g/m 2 or less, and particularly preferably 3,500 g/m 2 . It is below.
  • the thickness of the fiber mat according to the present invention is not particularly limited, it is preferably 4 mm or more, more preferably 5 mm or more, and even more preferably 6 mm or more. Also, the thickness of the fiber mat is preferably 40 mm or less, more preferably 35 mm or less, and particularly preferably 30 mm or less.
  • the basis weight and thickness per unit area of the fiber mat can be adjusted to the above range by adjusting the amount of fiber per unit area when stacking the fiber assembly constituting the fiber mat with a folding device.
  • the fiber mat in the present invention may have a structure in which a plurality of fiber mats are bonded together or a single structure. Preferably.
  • glass fiber mat The forms of the glass fiber mat used in the present invention include felt and blanket processed with short glass fiber, chopped strand mat processed with continuous glass fiber, swirl mat of continuous glass fiber, and unidirectional aligned mat. etc. Among these, a glass fiber mat obtained by needle-punching a swirl mat of continuous glass fiber is particularly preferable because the strength and impact resistance of the stampable sheet are excellent.
  • the highly heat-resistant fiber mat according to the present invention is a mat that is composed of highly heat-resistant fibers and subjected to a needling treatment. Therefore, the mat has needle marks formed by the needling process. That is, when needles with barbs are pulled out and stabbed into the highly heat-resistant fiber assembly by needling treatment, at least part of the fibers are extended substantially in the thickness direction by the needles at the locations where the needles are pulled out and stabbed. . As a result, needle marks are formed on the surface of the highly heat-resistant fiber mat.
  • bundles of highly heat-resistant fibers that are present inside the needling-treated high-heat-resistant fiber mat and are formed substantially in the thickness direction are called warp threads.
  • the warp yarns having a specific diameter and length are defined as the effective warp yarns.
  • all the warp threads protruding from both peeling surfaces (one peeling surface and the other peeling surface) per unit area (50 mm ⁇ 50 mm) have a diameter of 100 ⁇ m or more.
  • a warp yarn having a protruding length of 2 mm or more is defined as an effective warp yarn.
  • the needling process is used to adjust the bulk density, peel strength, surface pressure (surface pressure after high-temperature cycles), and repulsive force durability (surface pressure retention ratio after high-temperature cycles) of the alumina fiber mat by forming warp threads.
  • the effective warp means a warp that exists substantially in the thickness direction inside the high heat-resistant fiber mat and has a diameter and length that can function as a warp.
  • the volume of the effective warp means the volume of the area protruding from the peeling surface. In the present invention, it is preferable to use an alumina fiber mat.
  • thermoplastic resin sheet on the fiber mat In the method of laminating the thermoplastic resin sheet on the fiber mat and heating and melting, appropriate conditions may be selected according to the type of thermoplastic resin. Preferred conditions when polypropylene is used are described below.
  • the heating temperature is preferably 170-300°C. When the heating temperature is 170° C. or higher, the polypropylene resin has sufficient fluidity, the fiber mat can be sufficiently impregnated with the polypropylene composition, and a suitable stampable sheet can be obtained. On the other hand, when the heating temperature is 300° C. or lower, the polypropylene composition does not deteriorate. Further, the applied pressure is preferably 0.1 to 1 MPa.
  • the fiber mat When the applied pressure is 0.1 MPa or more, the fiber mat can be sufficiently impregnated with the polypropylene composition, and a suitable stampable sheet can be obtained. On the other hand, if the pressure is 1 MPa or less, the polypropylene composition will flow and burrs will not occur.
  • the cooling temperature is not particularly limited as long as it is below the freezing point of the thermoplastic resin in the polypropylene composition. I have nothing to do. From the above point of view, the cooling temperature is preferably room temperature to 80°C.
  • Methods for obtaining a stampable sheet by heating, pressurizing, and cooling the laminate include a method of press-molding the laminate in a mold equipped with a heating device, and a method of press-molding the laminate in a mold equipped with a heating device.
  • lamination processing in which heat and pressure are applied between two pairs of rollers, and in particular, lamination processing is preferable because it can be continuously produced, resulting in good productivity.
  • the thickness of the stampable sheet of the present invention is usually 1-10 mm, preferably 2-5 mm. When the thickness of the stampable sheet is 1 mm or more, it is easy to manufacture the stampable sheet. Good moldability can be obtained without the need for long preheating.
  • the resin constituting the fiber-reinforced resin of the present invention is not particularly limited, but may be a thermosetting resin.
  • the thermosetting resin is not particularly limited and includes vinyl urethane resin, unsaturated polyester resin, acrylic resin, epoxy resin, phenol resin, melamine resin, furan resin and the like. Moreover, these thermosetting resins can be used alone or in combination of two or more. Among these resins, vinyl urethane resins, epoxy resins, and phenol resins are preferred from the viewpoint of resin physical properties, versatility, cost, and the like.
  • the thermosetting resin and the fiber can be composited and used as a fiber-reinforced composite material.
  • the fiber-reinforced composite material includes a prepreg in which a reinforcing fiber base material containing continuous fibers is impregnated with a thermosetting resin composition, and a sheet molding in which a reinforcing fiber base material containing short fibers is impregnated with a thermosetting resin composition.
  • a compound (SMC) or the like is used. Compression molding of fiber-reinforced composite materials is widely used as a method for producing fiber-reinforced composite material molded articles.
  • the content of the thermosetting resin in the battery housing of the present invention is preferably 20-80% by mass.
  • the content of the thermosetting resin is 20% by mass or more, the moldability is sufficient, and the molding of the battery housing becomes easy.
  • the content of the thermosetting resin in the battery housing is preferably 35 to 70% by mass, more preferably 40 to 60% by mass.
  • thermosetting resin a method for manufacturing the battery housing of the present invention using a thermosetting resin
  • press molding is preferable from the viewpoint of productivity.
  • a compound (SMC) or the like is used.
  • the structure of the invention has a battery housing and a battery cell.
  • the battery housing of the present invention is as described in detail above.
  • a battery is preferable as the structure in the present invention, and the battery is not particularly limited. Examples thereof include secondary batteries such as lithium ion batteries, nickel-hydrogen batteries, lithium-sulfur batteries, nickel-cadmium batteries, nickel-iron batteries, nickel-zinc batteries, sodium-sulfur batteries, lead-acid batteries, and air batteries.
  • the lithium ion battery is preferred, and the battery housing of the present invention is particularly suitable for suppressing thermal runaway of the lithium ion battery. That is, the battery housing of the present invention is preferably a battery housing for lithium ion batteries.
  • the mat layer of the inorganic fibers B is arranged on the battery cell side in the battery housing.
  • the thermal runaway of the battery is suppressed step by step. Specifically, the blast generated at the time of thermal runaway is suppressed by the inorganic fiber B, and the high temperature flame is suppressed by the high heat resistant fiber A. It is advantageous in that it is possible to
  • the electric mobility in the present invention refers to transportation equipment such as vehicles, ships, and airplanes that operate using electricity as an energy source.
  • Vehicles include not only electric vehicles (EV) but also hybrid vehicles.
  • the structure such as a battery having the battery housing and the battery cells of the present invention described above is highly safe and can extend the traveling distance. Very useful. It is particularly useful for electric vehicles.
  • Dispersant ⁇ -olefin/maleic anhydride copolymer manufactured by Mitsubishi Chemical Corporation, Diacalna 30M, weight average molecular weight 7,800. 4.
  • Glass fiber mat A glass fiber mat was used which was needle-punched from a swirl mat (basis weight 880 g/m 2 ) made from roving continuous glass fibers (fiber diameter 23 ⁇ m). 5.
  • Alumina Fiber Mat A mat (weight per unit area: 900 g/m 2 ) manufactured from commercially available crystalline alumina fibers (“MAFTEC” (registered trademark) manufactured by Mitsubishi Chemical Corporation) was used.
  • Preparation Example 1 (Preparation of polypropylene resin composition) The polypropylene resin, flame retardant, and dispersant are melt-kneaded (230° C.) in the proportions shown in Table 1 to prepare pellets of a polypropylene resin composition (hereinafter referred to as “PP composition 1”). did.
  • Example 1 Description will be made below with reference to FIG.
  • the pellets of the PP composition 1 granulated in Preparation Example 1 are put into an extruder, melted, and then extruded into a sheet shape, and the extruded sheet-like PP (21, 21' and 21' in FIG. 2 '), the glass fiber mat 23 and the alumina fiber mat 22 are laminated by supplying PP as the outermost layer and supplying the glass fiber mat 23 and the alumina fiber mat 22 in between so that the mass ratio of a and b in Table 1 is obtained.
  • the mixture was heated and pressed at 230° C. for 4 minutes while applying a pressure of 0.3 MPa, and then solidified by cooling to obtain a stampable sheet (thickness: 3.8 mm).
  • stampable sheets a and one stampable sheet b obtained above b is sandwiched from both sides by a, far infrared heating furnace (set temperature 270-300 ° C.) for 4 minutes to a material temperature of 210°C. Then, a pressure of 150 kg/cm 2 was applied by a pressing machine equipped with a mold and held for 30 seconds, followed by cooling and solidification to obtain a box-shaped compact (thickness: 3.0 mm).
  • Table 2 shows the results of evaluation by the above method. Note that the stampable sheets a to f, Examples 1 to 3, and Comparative Example 1 were all prepared by adding arbitrary additive components in addition to the components shown in Tables 1 and 2 so that the total was 100% by mass. .
  • Example 2 In the method for producing a stampable sheet of Example 1, the contents of the polypropylene resin, flame retardant, and dispersant in the resin composition were changed as c and d described in Table 1, and d was c from both sides. A molded body (thickness: 3.0 mm) was obtained in the same manner as in Example 1, except that the housing cover was molded with the mass ratio changed as shown in Table 2. Table 2 shows the results of evaluation by the above method.
  • Example 3 In the method for producing a stampable sheet of Example 1, the resin composition did not contain a flame retardant and a dispersant, and the contents of glass fiber and alumina fiber were changed to c and e shown in Table 1, and e A molded body (thickness: 3.0 mm) was obtained in the same manner as in Example 1 except that the mass ratio was changed as shown in Table 2 and the housing cover was molded. . Table 1 shows the results of evaluation by the above method.
  • Comparative example 1 In Example 1, the pellets and chopped carbon fibers were kneaded in the kneader at the ratio f in Table 1, and the obtained compound was used to form a sheet, and the alumina fiber mat was not used. A stampable sheet was obtained in the same manner as in Example 1 except for the above. Thereafter, 3 sheets of f were stacked, the mass ratio was changed as shown in Table 2, and a molded body (thickness: 3.0 mm) was obtained in the same manner as in Example 1 except that the housing cover was molded. Table 2 shows the results of evaluation by the above method.
  • the dispersant ratio is the content (parts by mass) of the dispersant with respect to 100 parts by mass of the flame retardant.
  • the battery housing of the present invention containing highly heat-resistant fibers has excellent flame-shielding properties.
  • the battery housing of the present invention is lightweight because the main component is resin.
  • the battery housing of the present invention has excellent flame-shielding properties, and since resin is the main component, it has excellent workability. Moreover, since it is lightweight, the structure using the battery housing of the present invention is useful for electric mobility.
  • battery module 10 structure (battery) 11 battery module 12 battery pack 13 battery housing 20 stampable sheet 21 polypropylene sheet 21′ polypropylene sheet 21′′ polypropylene sheet 22 glass fiber mat 23 alumina fiber mat

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US18/286,676 US20240194993A1 (en) 2021-04-16 2022-04-18 Battery Housing
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EP4324875B1 (en) 2025-08-27
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EP4324875A1 (en) 2024-02-21
US20240194993A1 (en) 2024-06-13

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