WO2019088195A1 - Feuille d'isolation thermique pour bloc-batterie et bloc-batterie - Google Patents

Feuille d'isolation thermique pour bloc-batterie et bloc-batterie Download PDF

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Publication number
WO2019088195A1
WO2019088195A1 PCT/JP2018/040577 JP2018040577W WO2019088195A1 WO 2019088195 A1 WO2019088195 A1 WO 2019088195A1 JP 2018040577 W JP2018040577 W JP 2018040577W WO 2019088195 A1 WO2019088195 A1 WO 2019088195A1
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Prior art keywords
heat
inorganic
heat insulation
layer
heat insulating
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PCT/JP2018/040577
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English (en)
Japanese (ja)
Inventor
直己 高橋
清成 畑中
寿 安藤
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イビデン株式会社
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—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
    • 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
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • 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
    • 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
    • H01M10/6595—Means for temperature control structurally associated with the cells by chemical reactions other than electrochemical reactions of the cells, e.g. catalytic heaters or burners
    • 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, for example, a heat insulating sheet for a battery pack, which is suitably used for a battery pack serving as a power source of an electric motor for driving an electric vehicle or a hybrid vehicle.
  • This battery cell mainly uses a lithium ion secondary battery capable of high capacity and high output compared to lead storage battery and nickel hydrogen battery etc., but due to internal short circuit and overcharge of the battery etc.
  • thermal runaway occurs in one battery cell, the propagation of heat to the other adjacent battery cells may cause thermal runaway of the other battery cells.
  • Patent Document 1 describes a power storage device including one or more power storage elements, which is one of the one or more power storage elements.
  • a first plate and a second plate disposed laterally of the first storage element, the first plate and the second plate being disposed such that the surfaces of the first plate and the second plate face each other;
  • a low thermal conductive layer for example, an air layer
  • the first storage element is formed.
  • the radiation heat from the first storage element or the radiation heat toward the first storage element is blocked by the two plate members, and the heat transfer from one of the two plate members to the other is suppressed by the low heat conduction layer. Achieve effective insulation between the object and other objects It is disclosed that it is.
  • Patent Document 1 Although it is possible to suppress the radiation heat from a certain storage element or the radiation heat toward a certain storage element and the heat transfer between the two plate members by the low heat conduction layer, it becomes a heat source When the amount of heat generated from each storage element is large, it can not always be said that the heat insulation effect is sufficient.
  • the present invention has been made in view of such circumstances, and in forming a battery pack in which a plurality of battery cells are connected in series or in parallel, the propagation of heat between the battery cells is effectively suppressed. It is an object of the present invention to provide a heat insulating sheet for a battery pack that can be
  • the gist of the heat insulating sheet for a battery assembly is a set in which a plurality of battery cells are disposed via a heat insulating sheet and the plurality of battery cells are connected in series or in parallel.
  • a heat insulating sheet for use in a battery comprising: a heat insulating layer comprising at least inorganic fibers or inorganic powder; and an endothermic layer formed on both surfaces of the heat insulating layer and comprising at least inorganic hydrate.
  • the heat insulation layer has lower thermal conductivity than the heat absorption layer.
  • the inorganic powder has a refractive index ratio (relative refractive index) to light of a wavelength of 1 ⁇ m or more at 1.25 or more.
  • the inorganic powder contains TiO 2 powder or SiO 2 powder.
  • the inorganic powder is scale-like particles having anisotropy in thermal conductivity, and the plane direction of the scale-like particles is perpendicular to the thickness direction of the heat insulation sheet. It is oriented in the direction.
  • the inorganic hydrate is at least one of aluminum hydroxide and magnesium hydroxide.
  • the inorganic fibers are at least one of silica-alumina fibers, alumina fibers, silica fibers, rock wool, Alkaline Earth Silicate (AES) fibers and glass fibers. It is.
  • the gist of an assembled battery according to one aspect of the present invention is characterized in that a plurality of battery cells are disposed via the above-described heat insulating sheet for battery assembly, and the plurality of battery cells are connected in series or in parallel. I assume.
  • FIG. 1 is a cross-sectional view schematically showing a configuration of a heat insulation sheet for a battery assembly according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view schematically showing a configuration of a heat insulating sheet for battery assembly according to another embodiment of the present invention.
  • FIG. 3 is sectional drawing which shows typically the structure of the assembled battery which applied the heat insulation sheet for assembled batteries which concerns on one Embodiment of this invention.
  • FIG. 4 is a graph in which the temperature change of the adjacent battery cell surface is plotted against the elapsed time when the heat insulation sheets of Examples 1 to 3 and Comparative Examples 1 to 6 are heated by a heater.
  • the present inventors provide a heat insulating sheet for a battery pack capable of effectively suppressing the propagation of heat between battery cells even when the amount of heat generated from each storage element serving as a heat source is large. In order to do so, we have conducted intensive studies.
  • a heat insulating sheet comprising a heat insulating layer comprising at least inorganic fibers or inorganic powder as an intermediate layer, and a heat absorbing layer comprising at least inorganic hydrate formed on both surfaces thereof is disposed in a battery assembly It has been found that the above problems can be solved by interposing between the battery cells.
  • the inorganic hydrate in the endothermic layer which is the outer layer when the inorganic hydrate in the endothermic layer which is the outer layer is heated by the heat generated in a certain battery cell, the inorganic hydrate absorbs the heat and releases the water.
  • the heat absorption effect of the battery cell can be effectively reduced by this heat absorption action.
  • the reduced heat can effectively suppress the propagation of heat between the battery cells by the heat insulating layer which is the intermediate layer, even if the amount of heat generated from the battery cells is large. , Sufficient insulation effect can be obtained.
  • thermal runaway occurs in one battery cell, it is possible to effectively suppress the propagation of heat to other adjacent battery cells, thereby suppressing the occurrence of thermal runaway in the other battery cells. Can.
  • the thickness of the heat insulating layer is extreme unlike that using only the heat insulating layer to suppress heat transfer. There is no need to thicken. For this reason, it is possible to reduce the thickness of the whole heat insulating sheet (for example, 5 mm or less), and as a result, it is possible to improve the volumetric energy density of the assembled battery while securing the safety of the assembled battery. Become.
  • FIG. 1 is a cross-sectional view schematically showing a configuration of a heat insulation sheet for a battery assembly according to an embodiment of the present invention.
  • the heat insulating sheet 10 for a battery assembly according to the present embodiment has a heat insulating layer 12 containing at least inorganic fibers or inorganic powder as an intermediate layer, and a double layer in which the heat absorbing layer 14 made of at least inorganic hydrate is formed on both surfaces thereof. It consists of (laminated structure).
  • the heat insulating layer 12 is made of at least an inorganic fiber or an inorganic powder, and suppresses the transfer of heat generated in one battery cell to another adjacent battery cell. Also, the thermal conductivity of the heat insulating layer 12 is lower than the thermal conductivity of the endothermic layer 14.
  • the endothermic layer 14 is made of at least an inorganic hydrate, and when the inorganic hydrate in the endothermic layer is heated by the heat generated by a battery cell, the inorganic hydrate absorbs the heat and releases moisture. . This heat absorption action reduces the calorific value of the battery cell.
  • the heat insulating layer 12 having low thermal conductivity is provided as the intermediate layer, and the heat absorption layer 14 is disposed on both surfaces of the intermediate layer as the outer layer thereof, thereby reducing the amount of heat generated in the battery cell.
  • the heat insulating layer 12 can suppress the propagation of heat, and can effectively suppress the propagation of heat to other adjacent battery cells.
  • the heat insulation sheet 10 for a battery pack As a specific usage of the heat insulation sheet 10 for a battery pack, as shown in FIG. 3, a plurality of battery cells 20 are disposed via the heat insulation sheet 10 for a battery pack, and the plurality of battery cells 20 are in series.
  • the battery assembly 30 is configured to be stored in the battery case 30 in a state of being connected in parallel (the connected state is not shown).
  • the lithium ion secondary battery is used suitably, for example as the battery cell 20, it is not specifically limited to this.
  • the heat insulation layer 12 contains at least an inorganic fiber or an inorganic powder. That is, as a constituent material of the heat insulation layer 12, any one of inorganic fibers and inorganic powders may be included, and by including any one of these, it is possible to exhibit the effect as a heat insulation material. it can. However, by containing both the inorganic fiber and the inorganic powder, the inorganic powder can divide continuous voids in the structure formed by the intertwining of the inorganic fiber, so that the convective heat transfer in the heat insulating layer 12 is effectively made. It becomes possible to reduce and it can exhibit the heat insulation effect more effectively.
  • the inorganic fibers include silica-alumina fibers, alumina fibers, silica fibers, rock wool, alkali earth silicate fibers, glass fibers, zirconia fibers and potassium titanate whisker fibers. These inorganic fibers are preferable in terms of heat resistance, strength, and availability.
  • the inorganic fibers may be used alone or in combination of two or more.
  • silica-alumina fibers, alumina fibers, silica fibers, rock wool, alkali earth silicate fibers and glass fibers are preferable.
  • the cross-sectional shape of the inorganic fiber is not particularly limited, and examples thereof include a circular cross-section, a flat cross-section, a hollow cross-section, a polygonal cross-section, and a core-sheath cross-section.
  • a modified cross-section fiber having a hollow cross section, a flat cross section or a polygonal cross section can be suitably used because the heat insulation property is slightly improved.
  • the preferable lower limit of the average fiber length of the above-mentioned inorganic fiber is 0.1 mm, and the more preferable lower limit is 0.5 mm.
  • the preferable upper limit of the average fiber length of the said inorganic fiber is 50 mm, and a more preferable upper limit is 10 mm. If the average fiber length of the inorganic fibers is less than 0.1 mm, entanglement of the inorganic fibers is unlikely to occur, and the mechanical strength of the resulting heat insulating layer 12 may be reduced.
  • the inorganic fibers can not be tightly intertwined, or only a single inorganic fiber is curled up, which makes it easy to form continuous voids, so it has thermal insulation. It may cause a decline.
  • the preferable lower limit of the average fiber diameter of the inorganic fiber is 1 ⁇ m, the more preferable lower limit is 2 ⁇ m, and the still more preferable lower limit is 3 ⁇ m.
  • the preferable upper limit of the average fiber diameter of the said inorganic fiber is 10 micrometers, and a more preferable upper limit is 7 micrometers. If the average fiber diameter of the inorganic fiber is less than 1 ⁇ m, the mechanical strength of the inorganic fiber itself may be reduced. Further, from the viewpoint of the influence on the health of the human body, it is preferable that the average fiber diameter of the inorganic fiber is 3 ⁇ m or more.
  • the average fiber diameter of the above-mentioned inorganic fiber is larger than 10 ⁇ m, solid heat transfer with the inorganic fiber as a medium may increase to cause a decrease in heat insulation, and the formability of the heat insulation layer 12 may be deteriorated. There is.
  • examples of the inorganic powder include TiO 2 powder, SiO 2 powder, BaTiO 3 powder, PbS powder, ZrO 2 powder, SiC powder, NaF powder and LiF powder. These inorganic powders may be used alone or in combination of two or more.
  • preferred combinations are a combination of TiO 2 powder and SiO 2 powder, a combination of TiO 2 powder and BaTiO 3 powder, a combination of SiO 2 powder and BaTiO 3 powder, or And combinations of TiO 2 powder, SiO 2 powder and BaTiO 3 powder.
  • the TiO 2 powder has a high refractive index to infrared rays, and has an effect of improving the heat insulation in a high temperature range.
  • SiO 2 powder has a low solid thermal conductivity, and it is easy to form fine voids with fine particles, so that it has an effect of suppressing the convection and improving the heat insulation in a low temperature range. Therefore, the combination of TiO 2 powder and SiO 2 powder can be expected to provide heat insulation in a wide temperature range from a low temperature range to a high temperature range, and a combination of these is particularly preferable.
  • the plane direction of the scale-like particles 16 is the thickness direction of the heat insulation sheet 10 for the assembled battery. It is preferable to orient in a direction perpendicular to (that is, in the thickness direction of the heat insulating layer 12).
  • the scaly particles 16 made of inorganic powder have anisotropy in thermal conductivity, and the thermal conductivity of the scaly particles in the surface direction is very high compared to the thermal conductivity in the direction perpendicular to the surface direction. Excellent.
  • the heat propagation in the thickness direction of the heat insulation sheet 10 for the assembled battery is made more effective by orienting the surface direction of the scaly particles in the direction perpendicular to the thickness direction of the heat insulation sheet 10 for the assembled battery. Can be suppressed. Therefore, as shown in FIG. 3, when the battery assembly thermal insulation sheet 10 is interposed between a plurality of battery cells 20, the heat transfer from one battery cell 20 to another battery cell 20 is more effective. It is possible to Furthermore, by having the above configuration, the flexibility of the battery pack thermal insulation sheet 10 can be further enhanced.
  • a preferable upper limit is 50 mass% with respect to the total weight of the material which comprises the heat insulation layer 12
  • a further preferable upper limit is 40% by mass.
  • the preferable minimum of the compounding quantity of the said inorganic fiber is 5 mass%, and a still more preferable minimum is 10 mass%. If the compounding amount is less than 5% by mass, the reinforcing effect by the inorganic fibers can not be obtained, and the handleability and mechanical strength of the heat insulating layer 12 may be reduced, and a good formability may not be obtained.
  • the compounding amount exceeds 50% by mass, many continuous voids exist in the structure in which the inorganic fibers constituting the heat insulating layer 12 are intertwined, and convective heat transfer, molecular heat transfer and radiation heat transfer increase. Heat insulation properties may deteriorate.
  • a preferable upper limit is 95 mass% with respect to the total weight of the material which comprises the heat insulation layer 12
  • a further preferable upper limit is 90% by mass.
  • the preferable minimum of the compounding quantity of the said inorganic powder is 50 mass%, and a still more preferable minimum is 60 mass%.
  • the preferable lower limit of the average particle diameter of the inorganic powder is 0.5 ⁇ m, and the more preferable lower limit is 1 ⁇ m.
  • the preferable upper limit of the average particle diameter of the inorganic powder is 20 ⁇ m, and the more preferable upper limit is 10 ⁇ m. If the average particle diameter of the inorganic powder is less than 0.5 ⁇ m, not only the production of the heat insulating layer 12 becomes difficult, but also the radiation heat scattering becomes insufficient, and the thermal conductivity of the heat insulating layer 12 increases (that is, the heat insulating property) May decrease).
  • the air gaps formed in the heat insulating layer 12 become extremely large, so convective heat transfer and molecular heat transfer increase, and also in this case the thermal conductivity increases Resulting in.
  • the shape of the inorganic powder is not particularly limited as long as the average particle diameter is in the above range, and any shape such as a sphere, an ellipsoid, a polyhedron, or a shape or profile having irregularities or protrusions on the surface The shape of is mentioned.
  • the ratio of the refractive index to light with a wavelength of 1 ⁇ m or more is 1.25 or more.
  • the inorganic powder has a very important role as a scattering material of radiant heat, and the radiant heat can be scattered more effectively as the refractive index is larger.
  • the relative refractive index is extremely important for the suppression of phonon conduction, and the larger the value, the better the suppression effect.
  • materials capable of suppressing phonon conduction generally, substances having lattice defects in crystals or substances having complex structures are known.
  • the aforementioned TiO 2 , SiO 2 , and BaTiO 3 tend to have lattice defects and have a complex structure, and therefore are considered to be effective not only for radiation heat scattering but also phonon scattering.
  • an inorganic powder having a reflectance of 70% or more to light having a wavelength of 10 ⁇ m or more can be suitably used.
  • the light having a wavelength of 10 ⁇ m or more is light in the so-called infrared to far infrared wavelength region, and the radiation heat transfer can be more effectively reduced by the reflectance to light in this wavelength region being 70% or more.
  • the solid thermal conductivity of the inorganic powder is preferably 20 W / m ⁇ K or less at room temperature.
  • an inorganic powder whose solid thermal conductivity at room temperature is larger than 20 W / m ⁇ K is used as a raw material, solid heat transfer becomes dominant in the heat insulating layer 12, and the thermal conductivity increases (the thermal insulation property decreases). There is a risk of
  • the inorganic fiber refers to an inorganic material having an aspect ratio of 3 or more.
  • the inorganic powder refers to an inorganic material having an aspect ratio of less than 3.
  • the aspect ratio means the ratio (b / a) of the major axis b to the minor axis a of the substance.
  • the heat insulation layer 12 may contain an inorganic binder for the purpose of maintaining the strength at high temperature.
  • examples of the inorganic binder include colloidal silica, synthetic mica, montmorillonite and the like.
  • the above inorganic binders may be used alone or in combination of two or more.
  • This inorganic binder can be used as needed in the range of 1 to 10% by mass with respect to the total weight of the constituent materials of the heat insulation layer 12.
  • it can be used, for example, mixing in a raw material, or impregnating to the obtained heat insulating material.
  • an organic elastic material may be used as a constituent material of the heat insulating layer 12 as needed.
  • This organic elastic material is useful in providing flexibility to the heat insulating layer 12, and for example, synthetic rubber latex binders such as natural rubber emulsion, acrylonitrile butadiene rubber (NBR), styrene butadiene rubber (SBR), etc. are suitably used. It can be used.
  • synthetic rubber latex binders such as natural rubber emulsion, acrylonitrile butadiene rubber (NBR), styrene butadiene rubber (SBR), etc.
  • NBR acrylonitrile butadiene rubber
  • SBR styrene butadiene rubber
  • the compounding amount of the organic elastic material is preferably in the range of 0 to 5% by mass with respect to the total weight of the constituent materials of the heat insulation layer 12.
  • the organic elastic material burns away when used in a high temperature range of 700 ° C. or more when the compounding amount exceeds 5% by mass, and the voids significantly increase, so the heat insulation may be deteriorated. There is.
  • the thickness of the heat insulation layer 12 is not particularly limited, but is preferably in the range of 0.1 to 4.0 mm. When the thickness of the thermal insulation layer 12 is less than 0.1 mm, sufficient mechanical strength can not be imparted to the thermal insulation layer 12. On the other hand, when the thickness of the heat insulation layer 12 exceeds 4.0 mm, there is a possibility that the volume energy density of the assembled battery may be lowered.
  • the inorganic powder constituting the heat insulation layer 12 does not easily escape to the outside of the heat insulation layer 12, but for the purpose of preventing the escape of the inorganic powder, part or all of the heat insulation layer 12 is densified as needed. May be In the heat insulation layer 12 of the present embodiment, the inorganic powder constituting the heat insulation layer 12 is included in the structure in which the inorganic fibers are intertwined, and therefore does not easily escape from the inorganic fibers to the outside. However, depending on the use environment, strong impact may be applied to the heat insulation layer 12 and the inorganic powder may escape into the air, so the structure of the inorganic fiber in the portion including the inorganic powder is densified, The inorganic powder may be prevented from escaping.
  • a method of densifying the heat insulating layer 12 for example, there is a method of heating so as to melt only the surface in the entangled structure of inorganic fibers, or a method of covering the surface of the heat insulating layer 12 with a heat resistant film etc.
  • the method is not particularly limited as long as the powder does not escape.
  • the bulk density of the heat insulating layer 12 is not particularly limited, but is preferably in the range of 0.1 to 1.0 g / cm 3 .
  • the bulk density can be obtained as a value obtained by dividing the mass by the apparent volume (see JIS A 0202_2213). If the bulk density is less than 0.1 g / cm 3 , convective heat transfer and molecular heat transfer will increase, while if the bulk density exceeds 1.0 g / cm 3 , the heat transfer will increase due to the increase of solid heat transfer. In either case, the thermal insulation will be reduced.
  • the endothermic layer contains at least anhydrous hydrate.
  • the anhydrous hydrate include aluminum hydroxide (Al (OH) 3 ), magnesium hydroxide (Mg (OH) 2 ), dawsonite (NaAl (OH)) and the like. These inorganic hydrates may be used alone or in combination of two or more. Among the above-mentioned inorganic hydrates, aluminum hydroxide or magnesium hydroxide is particularly preferable from the viewpoint of good endothermic properties.
  • a preferable upper limit is 90 mass% with respect to the total weight of the material which comprises the endothermic layer 14, and a still more preferable upper limit is 80 mass%.
  • the preferable minimum of the compounding quantity of the said inorganic powder is 30 mass%, and a still more preferable minimum is 50 mass%. If this compounding amount is less than 30% by mass, there is a possibility that good endothermic characteristics can not be obtained. On the other hand, if the compounding amount exceeds 90% by mass, there is a possibility that the heat absorption layer can not be formed.
  • the heat absorption layer 14 may contain inorganic fibers or pulp fibers for the purpose of improving the strength at the time of molding.
  • inorganic fiber the thing similar to the inorganic fiber used for the heat insulation layer 12 demonstrated above can be used.
  • These inorganic fibers and pulp fibers can be used as needed in the range of 10 to 70% by mass with respect to the total weight of the materials constituting the endothermic layer 14.
  • An organic binder may be used as a material of the endothermic layer 14 if necessary.
  • This organic binder is useful for the purpose of improving the strength at the time of molding, and for example, a polymer flocculant or an acrylic emulsion can be suitably used.
  • the compounding amount of the organic binder can be used as needed in the range of 0.5 to 5.0% by mass with respect to the total weight of the materials constituting the endothermic layer 14.
  • the thickness of the heat absorption layer 14 is not particularly limited, but is preferably in the range of 0.1 to 4.0 mm. When the thickness of the endothermic layer 14 is less than 0.1 mm, sufficient mechanical strength can not be imparted to the endothermic layer 14. On the other hand, when the thickness of the heat absorption layer 14 exceeds 4.0 mm, there is a possibility that the formation of the heat absorption layer 14 itself becomes difficult.
  • the heat insulating layer 12 is manufactured by molding a material composed of at least inorganic fibers or inorganic powder by a dry molding method or a wet molding method. Below, the manufacturing method in the case of obtaining the heat insulation layer 12 by each shaping
  • inorganic fibers and inorganic powders and, if necessary, an inorganic binder and an organic elastic material are charged into a mixer such as a V-type mixer at a predetermined ratio. After thoroughly mixing the materials introduced into the mixer, the mixture is introduced into a predetermined mold and pressed to obtain the heat insulating layer 12. At the time of pressing, heating may be performed as needed.
  • the pressing pressure is preferably in the range of 0.98 to 9.80 MPa.
  • the heat insulation layer 12 obtained as a press pressure is less than 0.98 Mpa, there exists a possibility that it may collapse without being able to maintain intensity.
  • the pressing pressure exceeds 9.80 MPa, the processability is lowered due to excessive compression, and the bulk density is further increased, so that the solid heat transfer may be increased and the heat insulation may be lowered.
  • the slurry containing the above aggregates is introduced into a predetermined mold to obtain the heat insulating layer 12 which is wetted. By drying the obtained heat insulation layer 12, the target heat insulation layer 12 is obtained.
  • the heat insulating layer 12 can be obtained by either a dry molding method or a wet molding method, but it is preferable to use the wet molding method in terms of the ease of integral molding and the mechanical strength.
  • the endothermic layer 14 is manufactured by molding a material composed of at least an inorganic hydrate by a dry molding method or a wet molding method. About the detailed conditions of the manufacturing method of an endothermic layer, it is the same as that of the manufacturing method of the said heat insulation layer except changing an inorganic fiber and inorganic powder into an inorganic hydrate.
  • Example 1 As inorganic powder, 50% by mass of TiO 2 powder (average particle diameter: 8 ⁇ m) and 50% by mass of SiO 2 powder (average particle diameter: 15 nm) were added and thoroughly mixed. The above mixture was molded into a mold to obtain a heat insulating layer (heat insulating sheet) having a thickness of 1 mm, and then the heat insulating layer was dried at 110 ° C. for 8 hours.
  • TiO 2 powder average particle diameter: 8 ⁇ m
  • SiO 2 powder average particle diameter: 15 nm
  • the heat insulation sheet for assembled batteries was obtained.
  • Example 2 After molding an alumina-silica fiber (AF: Alumina Fiber) as an inorganic fiber by molding to obtain a heat insulation layer (heat insulation sheet) having a thickness of 1 mm, the heat insulation layer was dried under the condition of 110 ° C. ⁇ 8 hours.
  • AF Alumina Fiber
  • the heat insulation sheet for assembled batteries was obtained.
  • Example 3 60 mass% of alumina-silica fiber (AF) as inorganic fiber, 20 mass% of TiO 2 powder (average particle size: 8 ⁇ m) as inorganic powder, and 20 mass% of SiO 2 powder (average particle size: 15 nm) Mix well.
  • the above mixture was molded into a mold to obtain a heat insulating layer (heat insulating sheet) having a thickness of 1 mm, and then the heat insulating layer was dried at 110 ° C. for 8 hours.
  • the heat insulation sheet for assembled batteries was obtained.
  • Comparative Example 1 Under the same conditions and procedure as in Example 1, a heat insulating layer having a thickness of 2 mm was produced to obtain a heat insulating sheet for a battery pack.
  • the heat insulation sheet for assembled batteries is comprised only with the heat insulation layer in Example 1, and a heat absorption layer does not exist.
  • Comparative Example 2 Under the same conditions and procedure as in Example 2, a heat insulating layer having a thickness of 2 mm was produced to obtain a heat insulating sheet for a battery pack.
  • the heat insulation sheet for assembled batteries is comprised only with the heat insulation layer in Example 2, and a heat absorption layer does not exist.
  • Example 3 Under the same conditions and procedure as in Example 3, a heat insulating layer having a thickness of 2 mm was produced to obtain a heat insulating sheet for a battery pack.
  • the heat insulation sheet for assembled batteries is comprised only with the heat insulation layer in Example 3, and a heat absorption layer does not exist.
  • Comparative Example 4 A sheet of 2 mm in thickness made of alkali earth silicate (AES) fiber was prepared and used as a heat insulating sheet for battery pack.
  • AES alkali earth silicate
  • Comparative Example 5 A thermal insulation sheet for a battery pack was obtained by stacking a 1 mm thick mica sheet and a 1 mm thick alumina-silica fiber (AF) sheet.
  • Comparative Example 6 Under the same conditions and procedure as in Example 1, a heat absorption layer having a thickness of 2 mm was produced to obtain a heat insulating sheet for a battery pack. In Comparative Example 6, only the heat absorption layer in Example 1 constitutes a heat insulating sheet for a battery assembly, and no heat insulating layer is present.
  • a heater was disposed on one side of the heat insulation sheet for a battery pack obtained in each of Examples 1 to 3 and Comparative Examples 1 to 6, and a metal plate simulating a battery cell adjacent to the other side was disposed on the other side. Furthermore, a thermocouple was placed on the metal plate, and the heater temperature was heated to 700 ° C., and the temperature change of the surface of the adjacent battery cell (metal plate) with respect to elapsed time was measured.
  • Example 1 336 ° C.
  • Example 2 349 ° C.
  • Example 3 343 ° C Comparative Example 1: 367 ° C.
  • Comparative example 2 448 ° C.
  • Comparative example 3 427 ° C Comparative Example 4: 478 ° C.
  • Comparative example 5 403 ° C.
  • Comparative Example 6 385 ° C.

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Abstract

L'invention concerne une feuille d'isolation thermique pour un bloc-batterie, la feuille d'isolation thermique étant apte à supprimer efficacement une propagation de chaleur entre des cellules de batterie respectives, lorsqu'un bloc-batterie est configuré dans lequel une pluralité de cellules de batterie sont connectées en série ou en parallèle. Cette feuille d'isolation thermique (10), à travers laquelle une pluralité de cellules de batterie sont disposées et qui est utilisée pour un bloc-batterie configuré en connectant la pluralité de cellules de batterie en série ou en parallèle, comprend : une couche d'isolation thermique (12) composée d'au moins une fibre inorganique ou d'une poudre inorganique ; et des couches d'absorption de chaleur (14) formées sur les deux surfaces de la couche d'isolation thermique (12) et composées d'au moins un hydrate inorganique.
PCT/JP2018/040577 2017-10-31 2018-10-31 Feuille d'isolation thermique pour bloc-batterie et bloc-batterie WO2019088195A1 (fr)

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JP2020187868A (ja) * 2019-05-10 2020-11-19 イビデン株式会社 熱伝達抑制シート及び組電池
WO2021168026A1 (fr) * 2020-02-18 2021-08-26 Rogers Corporation Feuille multicouche de gestion thermique pour une batterie
CN113540657A (zh) * 2020-04-15 2021-10-22 上海汽车集团股份有限公司 一种高效动力电池热失控冲击防护的方法及装置
WO2021235189A1 (fr) * 2020-05-18 2021-11-25 阿波製紙株式会社 Feuille d'isolation thermique
CN113906619A (zh) * 2019-06-28 2022-01-07 三洋电机株式会社 电源装置和具有该电源装置的电动车辆以及蓄电装置
WO2022024078A1 (fr) * 2020-07-30 2022-02-03 3M Innovative Properties Company Barrière d'emballement thermique d'élément de batterie
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US11489217B2 (en) 2019-01-24 2022-11-01 Tdk Corporation Battery pack
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CN115926228A (zh) * 2022-12-26 2023-04-07 蜂巢能源科技(无锡)有限公司 保护层、其制备方法及锂离子电池
US11735332B2 (en) 2019-08-01 2023-08-22 3M Innovative Properties Company Thermal barrier material for a rechargeable electrical energy storage system

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JP7203870B2 (ja) * 2021-01-18 2023-01-13 イビデン株式会社 組電池用熱伝達抑制シート及び組電池
JP7089076B1 (ja) * 2021-02-01 2022-06-21 イビデン株式会社 組電池及び電池パック
WO2023157781A1 (fr) * 2022-02-15 2023-08-24 井前工業株式会社 Feuille de suppression d'emballement thermique, bloc-batterie l'utilisant, et module de bloc-batterie

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JP2020187868A (ja) * 2019-05-10 2020-11-19 イビデン株式会社 熱伝達抑制シート及び組電池
JP2020187869A (ja) * 2019-05-10 2020-11-19 イビデン株式会社 熱伝達抑制シート及び組電池
JP7332332B2 (ja) 2019-05-10 2023-08-23 イビデン株式会社 熱伝達抑制シート及び組電池
JP7332333B2 (ja) 2019-05-10 2023-08-23 イビデン株式会社 熱伝達抑制シート及び組電池
CN113906619B (zh) * 2019-06-28 2023-07-28 三洋电机株式会社 电源装置和具有该电源装置的电动车辆以及蓄电装置
CN113906619A (zh) * 2019-06-28 2022-01-07 三洋电机株式会社 电源装置和具有该电源装置的电动车辆以及蓄电装置
US11735332B2 (en) 2019-08-01 2023-08-22 3M Innovative Properties Company Thermal barrier material for a rechargeable electrical energy storage system
CN114556669A (zh) * 2019-10-11 2022-05-27 揖斐电株式会社 电池组用绝热片和电池组
WO2021168026A1 (fr) * 2020-02-18 2021-08-26 Rogers Corporation Feuille multicouche de gestion thermique pour une batterie
GB2607232A (en) * 2020-02-18 2022-11-30 Rogers Corp Thermal management multilayer sheet for a battery
CN113540657A (zh) * 2020-04-15 2021-10-22 上海汽车集团股份有限公司 一种高效动力电池热失控冲击防护的方法及装置
WO2021235189A1 (fr) * 2020-05-18 2021-11-25 阿波製紙株式会社 Feuille d'isolation thermique
WO2022024076A1 (fr) * 2020-07-30 2022-02-03 3M Innovative Properties Company Barrière d'emballement thermique d'élément de batterie
WO2022024078A1 (fr) * 2020-07-30 2022-02-03 3M Innovative Properties Company Barrière d'emballement thermique d'élément de batterie
CN115612299A (zh) * 2022-09-09 2023-01-17 东莞市零度导热材料有限公司 一种应用于新能源电池包上的防火隔热垫及其制备方法
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