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WO2025204998A1 - Matériau d'isolation thermique pour bloc-batterie, et bloc-batterie - Google Patents

Matériau d'isolation thermique pour bloc-batterie, et bloc-batterie

Info

Publication number
WO2025204998A1
WO2025204998A1 PCT/JP2025/009630 JP2025009630W WO2025204998A1 WO 2025204998 A1 WO2025204998 A1 WO 2025204998A1 JP 2025009630 W JP2025009630 W JP 2025009630W WO 2025204998 A1 WO2025204998 A1 WO 2025204998A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery pack
layered inorganic
sheet
fiber
insulating material
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.)
Pending
Application number
PCT/JP2025/009630
Other languages
English (en)
Japanese (ja)
Inventor
暁典 東條
佑帆 古嶋
寿 安藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ibiden Co Ltd
Original Assignee
Ibiden Co Ltd
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 Ibiden Co Ltd filed Critical Ibiden Co Ltd
Publication of WO2025204998A1 publication Critical patent/WO2025204998A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
    • F16L59/021—Shape or form of insulating materials, with or without coverings integral with the insulating materials comprising a single piece or sleeve, e.g. split sleeves; consisting of two half sleeves; comprising more than two segments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F16L59/07—Arrangements using an air layer or vacuum the air layer being enclosed by one or more layers of insulation
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/651—Means for temperature control structurally associated with the cells characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
    • 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 an insulating material for a battery pack and a battery pack using the insulating material for a battery pack.
  • Battery packs used in electric vehicles, hybrid vehicles, etc. are made up of multiple battery cells.
  • Battery cells may go into a thermal runaway state due to an internal short circuit or overcharging caused by external factors, which can cause the battery cell to overheat or catch fire.
  • the heat and flames that are generated in this way can spread to the surrounding area, potentially inducing thermal runaway in adjacent battery cells and causing serious damage.
  • battery packs are equipped with various safety components to prevent personal injury from thermal runaway in battery cells, such as partition members that suppress heat transmission between battery cells, and protective members that are placed between the battery cells and the battery case to suppress heat transmission and the release of flames outside the battery pack.
  • Patent Document 1 discloses a safety component that combines two mica layers with an aerogel layer filled in a sealed bag, with the two mica layers facing each other on the outside of the sealed bag.
  • Patent Document 2 also discloses a fire-resistant material for batteries that includes a mica layer and a foam coating.
  • the inventors conducted extensive research to provide a thin-walled insulating material that offers excellent thermal insulation. As a result, they discovered a thin-walled insulating material for battery packs that also offers excellent thermal insulation.
  • the insulating material for a battery pack of the present invention is an insulating material for a battery pack including a layered inorganic sheet formed by laminating layered inorganic paper, and is characterized in that there are gaps between at least the layered inorganic paper sheets, the gaps having a size in the thickness direction of 10 ⁇ m or more and 100 ⁇ m or less.
  • the insulating material for a battery pack of the present invention is thin, it exhibits excellent insulating properties because the layered inorganic material sheet has fine voids between the layers of layered inorganic material paper, which inhibits heat propagation.
  • the insulating material for a battery pack of the present invention is further characterized in that the layered inorganic paper has voids with a size of 1 ⁇ m or more and 50 ⁇ m or less in the thickness direction.
  • the insulating material for a battery pack of the present invention further has fine voids within the layered inorganic paper, which further suppresses the propagation of heat in the layered inorganic sheet, thereby providing even more excellent insulating effects.
  • the average void occupancy is preferably 5% or more and 70% or less in a 1 mm x 1 mm section of the cross section of the layered inorganic material sheet.
  • the void occupancy is within the above range, the strength of the layered inorganic material sheet can be maintained while improving the heat insulating properties.
  • the average size of the voids between the layered inorganic paper sheets is larger than the average size of the voids within the layered inorganic paper sheets.
  • the difference in the average size of the voids in the thickness direction between the layered inorganic paper and within the layered inorganic paper creates a graded heat insulating effect.
  • the layered inorganic paper preferably contains at least one silicate mineral selected from the group consisting of vermiculite, montmorillonite, beidellite, nontronite, saponite, hectorite, stevensite, and mica.
  • the layered inorganic material is the silicate mineral
  • the insulating material for a battery pack of the present invention exhibits excellent heat insulating properties, and the layered inorganic material sheet is likely to expand when heated.
  • the layered inorganic paper more preferably contains mica, since mica has excellent insulating properties and fire resistance.
  • the layered inorganic paper preferably has a thickness of 0.05 mm or more and 0.2 mm or less.
  • the thickness of the layered inorganic paper is within the above range, it is easy to achieve both thinness and heat insulation properties for the heat insulating material for a battery pack of the present invention.
  • the layered inorganic material sheet preferably has a thickness of 0.2 mm or more and 2.0 mm or less.
  • the thickness of the layered inorganic material sheet is within the above range, it is easy to achieve both thinness and heat insulation properties for the heat insulating material for a battery pack of the present invention.
  • the heat insulating material for a battery pack of the present invention preferably further comprises a heat insulating sheet laminated on the layered inorganic material sheet. If the battery pack insulating material of the present invention further contains an insulating sheet, it can compensate for the lack of insulating properties and thermal shock resistance to ejected material from battery cells in a thermal runaway state that are insufficient with the layered inorganic material sheet alone.
  • the heat insulating sheet preferably has a thickness of 0.5 mm or more and 5.0 mm or less. When the thickness of the heat insulating sheet is within the above range, it is easy to achieve both thinness and heat insulating properties for the heat insulating material for a battery pack of the present invention.
  • the heat insulating sheet preferably contains at least one material selected from the group consisting of silica nanoparticles, titania, alumina fiber, carbon fiber, mica, basalt fiber, soluble fiber, refractory ceramic fiber, glass fiber, aerogel composite material, microporous particles, hollow silica particles, thermally expandable inorganic materials, aerogel, silica, zirconia, zircon, barium titanate, zinc oxide, alumina, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, zinc hydroxide, iron hydroxide, manganese hydroxide, zirconium hydroxide, gallium hydroxide, cellulose fiber, fiber containing SiO2 , silica fiber, mullite fiber, alumina fiber, alumina silicate fiber, ceramic fiber, rock wool, alkaline earth silicate fiber, zirconia fiber, and mineral fiber.
  • the heat insulating material for a battery pack of the present invention preferably has an air layer between the layered inorganic material sheet and the heat insulating sheet. This is because the presence of an air layer between the layered inorganic material sheet and the heat insulating sheet improves the heat insulating performance of the heat insulating material for a battery pack of the present invention.
  • the battery pack of the present invention includes the insulating material for a battery pack of the present invention.
  • the battery pack of the present invention has excellent fire resistance and insulating properties.
  • the present invention it is possible to provide a thin insulating material for a battery pack that has excellent insulating properties. Furthermore, according to the present invention, it is possible to provide a battery pack including a battery pack insulating material having excellent thinness and heat insulating properties.
  • FIG. 1 is a schematic cross-sectional view showing an example of the insulating material for a battery pack of the present invention.
  • FIG. 2 is an enlarged photograph showing an example of the insulating material for a battery pack of the present invention.
  • FIG. 3A is a perspective view schematically showing an example of a battery pack of the present invention.
  • FIG. 3B is a cross-sectional view taken along line AA in FIG. 3A.
  • FIG. 3C is an exploded view of the battery pack shown in FIG. 3A.
  • FIG. 4 is a schematic cross-sectional view showing a heated surface and a non-heated surface in a simulation of heat insulation.
  • FIG. 5 is a graph showing the temperature difference between the heated surface and the unheated surface of the heat insulating material for Comparative Example 1 and Examples 1 to 4 at different thicknesses before heating.
  • FIG. 1 is a schematic cross-sectional view showing an example of the insulating material for a battery pack of the present invention.
  • the battery pack insulating material 40 shown in Figure 1 has an insulating sheet 41 laminated on a layered inorganic material sheet 42.
  • the layered inorganic material sheet 42 has a plurality of layered inorganic material papers 43 laminated thereon.
  • three sheets of layered inorganic material papers 43 are laminated.
  • the layered inorganic material papers 43 include voids 45a, 45b inside the layered inorganic material papers and between the layered inorganic material papers.
  • the number of sheets of layered inorganic paper 43 to be stacked is not particularly limited, but is preferably in the range of 2 to 20 sheets, more preferably 3 to 10 sheets.
  • the voids 45a and 45b can be formed by gasifying the hydroxyl groups and alkyl groups contained in the resin contained in the layered inorganic paper 43 through heating, but the layered inorganic paper 43 may also contain compounds (not shown) derived from the above resin.
  • the battery pack heat insulating material 40 may have a layered inorganic material sheet 42 laminated on the heat insulating sheet 41. That is, the heat insulating sheet 41 may be sandwiched between two layered inorganic material sheets 42 in the thickness direction.
  • the heat insulating material for a battery pack of the present invention does not necessarily need to include a heat insulating sheet.
  • the insulating material for a battery pack of the present invention preferably has voids in the layered inorganic paper with a size in the thickness direction of 1 ⁇ m or more and 50 ⁇ m or less, more preferably 2 ⁇ m or more and 20 ⁇ m or less.
  • the gaps formed between and within the layered inorganic paper are referred to as "voids.”
  • the shape of the voids is not particularly limited, but it is preferable that they are not of uniform size or shape but are sparse. Varying the size and shape of the voids is preferable because it complicates heat transfer and improves the heat insulating performance of the layered inorganic sheet.
  • the aspect ratio of the voids in the cross section of the layered inorganic material sheet is preferably 2 or more in the width/thickness direction. More preferably, it is 3 or more.
  • the cross section of the layered inorganic material sheet is a cross section cut along the thickness direction.
  • the aspect ratio of the voids is the average value calculated from the maximum dimensions in the width and thickness directions for any 10 voids when the cross section of the layered inorganic material sheet is exposed. Since the voids are present inside the layered inorganic material paper or between the layers of layered inorganic material paper, many of them have a wide shape in the width direction.
  • the layered inorganic paper is not particularly limited as long as it contains a layered inorganic material that has excellent fire resistance and insulation properties, but it preferably contains at least one silicate mineral selected from the group consisting of vermiculite, montmorillonite, beidellite, nontronite, saponite, hectorite, stevensite, and mica. It is even more preferable for the layered inorganic paper to contain mica. Mica has excellent insulation and fire resistance, making it ideal for use as an insulating material for battery packs. Muscovite and phlogopite are particularly preferred mica.
  • the method for manufacturing a battery pack insulation material having an air layer between the layered inorganic material sheet and the insulating sheet there are no particular limitations on the method for manufacturing a battery pack insulation material having an air layer between the layered inorganic material sheet and the insulating sheet.
  • the layered inorganic material paper laminate and the insulating sheet are bonded together with an organic adhesive, and heated at 500°C or higher for 5 minutes or more.
  • the layered inorganic material sheet and the insulating sheet can also be bonded together with an organic adhesive and heated, but using a layered inorganic material paper laminate is more efficient as it allows the resin within and between the layered inorganic material papers, and the organic adhesive between the layered inorganic material paper laminate and the insulating sheet, to be gasified simultaneously.
  • organic adhesive used is one that contains a material that generates gas when heated. When the adhesive contains such a material, gas is generated between the laminate of layered inorganic paper or the layered inorganic sheet and the heat insulating sheet when heated, creating an air layer between the laminate of layered inorganic paper or the layered inorganic sheet and the heat insulating sheet, improving the heat insulating performance.
  • the material that generates gas when heated is, for example, an organic material having a hydroxy group or an aldehyde group, and more specifically, polyamide-based organic materials, nylon-based organic materials, and the like.
  • the organic adhesive contains a polyamide-based organic material or a nylon-based organic material, it undergoes thermal decomposition upon heating, and water vapor and carbon dioxide are easily released from the adhesive due to hydroxyl groups and aldehyde groups, making it easier for an air layer to form between the layered inorganic material sheet and the heat insulating sheet, and therefore it is preferably used.
  • the battery pack of the present invention includes the insulating material for a battery pack of the present invention.
  • the housing portion 31 houses the module 20.
  • a battery pack heat insulating material 40 is provided between the module 20 and the case 30 .
  • the battery pack insulating material 40 has a heat insulating sheet 41 laminated on a layered inorganic material sheet 42.
  • the heat insulating sheet 41 is provided so as to contact the module 20.
  • the battery pack insulating material 40 may also be provided so that the layered inorganic material sheet 42 is in contact with the module 20.
  • the battery pack insulating material 40 may also be provided so as to contact the case 30.
  • the battery cell 21 stores electric power and is preferably a rechargeable secondary battery, such as a lithium ion battery, a nickel-metal hydride battery, or a sodium ion battery.
  • 3B and 3C has a rectangular parallelepiped shape.
  • the battery cells may have a three-dimensional shape other than a rectangular parallelepiped shape (for example, a cube or an irregular shape).
  • the bus bar 20b is a flat, electrically conductive metal member, and may be made of, for example, copper, a copper alloy, stainless steel (SUS), or aluminum.
  • the bus bar 20b may be fixed to the terminal 23 by any fixing means (for example, screwing, welding, etc.).
  • Materials that can be used to make the case 30 include steel and aluminum.
  • Stainless steel (SUS) is preferred as a steel material.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • General Physics & Mathematics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Algebra (AREA)
  • Physics & Mathematics (AREA)
  • Battery Mounting, Suspending (AREA)
  • Thermal Insulation (AREA)
  • Secondary Cells (AREA)

Abstract

La présente invention concerne un matériau d'isolation thermique (40) pour un bloc-batterie, ledit matériau d'isolation thermique étant mince mais présentant cependant d'excellentes propriétés d'isolation thermique. Ce matériau d'isolation thermique (40) pour un bloc-batterie comprend une feuille de matériau inorganique en couches (42) obtenue par stratification de papiers de matériau inorganique en couches (43), ledit matériau d'isolation thermique étant caractérisé en ce qu'il comprend des vides, dont la taille dans le sens de l'épaisseur est de 10 à 100 µm inclus, au moins entre les papiers de matériau inorganique en couches.
PCT/JP2025/009630 2024-03-29 2025-03-13 Matériau d'isolation thermique pour bloc-batterie, et bloc-batterie Pending WO2025204998A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2024-057791 2024-03-29
JP2024057791A JP2025154669A (ja) 2024-03-29 2024-03-29 電池パック用断熱材及び電池パック

Publications (1)

Publication Number Publication Date
WO2025204998A1 true WO2025204998A1 (fr) 2025-10-02

Family

ID=97219994

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2025/009630 Pending WO2025204998A1 (fr) 2024-03-29 2025-03-13 Matériau d'isolation thermique pour bloc-batterie, et bloc-batterie

Country Status (2)

Country Link
JP (1) JP2025154669A (fr)
WO (1) WO2025204998A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109987884A (zh) * 2019-04-12 2019-07-09 固德电材系统（苏州）股份有限公司 一种电池用防火材料及其制备方法和用途
JP2020136100A (ja) * 2019-02-20 2020-08-31 積水化学工業株式会社 耐火シート及びバッテリー
JP2022091057A (ja) * 2020-12-08 2022-06-20 王子ホールディングス株式会社 シート状耐熱材の製造方法および積層体
WO2022154107A1 (fr) * 2021-01-18 2022-07-21 イビデン株式会社 Feuille de suppression de transfert de chaleur pour bloc-batterie, et bloc-batterie
CN219523264U (zh) * 2023-02-28 2023-08-15 湖北平安电工科技股份公司 一种锂电池隔热防火复合板

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020136100A (ja) * 2019-02-20 2020-08-31 積水化学工業株式会社 耐火シート及びバッテリー
CN109987884A (zh) * 2019-04-12 2019-07-09 固德电材系统（苏州）股份有限公司 一种电池用防火材料及其制备方法和用途
JP2022091057A (ja) * 2020-12-08 2022-06-20 王子ホールディングス株式会社 シート状耐熱材の製造方法および積層体
WO2022154107A1 (fr) * 2021-01-18 2022-07-21 イビデン株式会社 Feuille de suppression de transfert de chaleur pour bloc-batterie, et bloc-batterie
CN219523264U (zh) * 2023-02-28 2023-08-15 湖北平安电工科技股份公司 一种锂电池隔热防火复合板

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