CN118263585A - Heat transfer suppressing sheet and battery pack - Google Patents
Heat transfer suppressing sheet and battery pack Download PDFInfo
- Publication number
- CN118263585A CN118263585A CN202311813843.9A CN202311813843A CN118263585A CN 118263585 A CN118263585 A CN 118263585A CN 202311813843 A CN202311813843 A CN 202311813843A CN 118263585 A CN118263585 A CN 118263585A
- Authority
- CN
- China
- Prior art keywords
- heat transfer
- heat
- resin film
- particles
- inorganic
- 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
Links
- 238000012546 transfer Methods 0.000 title claims abstract description 123
- 229920005989 resin Polymers 0.000 claims abstract description 108
- 239000011347 resin Substances 0.000 claims abstract description 108
- 239000012212 insulator Substances 0.000 claims abstract description 99
- 239000010954 inorganic particle Substances 0.000 claims abstract description 83
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 21
- 238000009413 insulation Methods 0.000 claims abstract description 16
- 239000000835 fiber Substances 0.000 claims description 66
- 239000012784 inorganic fiber Substances 0.000 claims description 33
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- 239000004743 Polypropylene Substances 0.000 claims description 8
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- 229920000573 polyethylene Polymers 0.000 claims description 8
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 8
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- 229920001155 polypropylene Polymers 0.000 claims description 8
- 229920002223 polystyrene Polymers 0.000 claims description 8
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 7
- 239000011146 organic particle Substances 0.000 claims description 5
- 238000003475 lamination Methods 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 abstract description 35
- 239000002245 particle Substances 0.000 description 69
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 62
- 239000002105 nanoparticle Substances 0.000 description 30
- 238000002844 melting Methods 0.000 description 29
- 230000008018 melting Effects 0.000 description 29
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- 230000000694 effects Effects 0.000 description 27
- 239000012943 hotmelt Substances 0.000 description 27
- 239000000377 silicon dioxide Substances 0.000 description 26
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 17
- 239000011164 primary particle Substances 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 14
- 229910044991 metal oxide Inorganic materials 0.000 description 9
- 150000004706 metal oxides Chemical class 0.000 description 9
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 8
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 8
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 7
- 239000003063 flame retardant Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000001629 suppression Effects 0.000 description 7
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- 238000004519 manufacturing process Methods 0.000 description 6
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- 238000005979 thermal decomposition reaction Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
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- 238000004806 packaging method and process Methods 0.000 description 5
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- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 239000004965 Silica aerogel Substances 0.000 description 3
- 239000004964 aerogel Substances 0.000 description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 3
- 229910002113 barium titanate Inorganic materials 0.000 description 3
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
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- 238000007789 sealing Methods 0.000 description 3
- 229920002725 thermoplastic elastomer Polymers 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- 239000010455 vermiculite Substances 0.000 description 3
- 229910052902 vermiculite Inorganic materials 0.000 description 3
- 235000019354 vermiculite Nutrition 0.000 description 3
- IVORCBKUUYGUOL-UHFFFAOYSA-N 1-ethynyl-2,4-dimethoxybenzene Chemical compound COC1=CC=C(C#C)C(OC)=C1 IVORCBKUUYGUOL-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical class O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- DNUARHPNFXVKEI-UHFFFAOYSA-K gallium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Ga+3] DNUARHPNFXVKEI-UHFFFAOYSA-K 0.000 description 2
- 150000004677 hydrates Chemical class 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000010445 mica Substances 0.000 description 2
- 229910052618 mica group Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
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- 239000004814 polyurethane Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
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- 229920003051 synthetic elastomer Polymers 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 2
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 2
- 229940007718 zinc hydroxide Drugs 0.000 description 2
- 229920002748 Basalt fiber Polymers 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 239000004697 Polyetherimide Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229920000800 acrylic rubber Polymers 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 239000010428 baryte Substances 0.000 description 1
- 229910052601 baryte Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
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- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- FSBVERYRVPGNGG-UHFFFAOYSA-N dimagnesium dioxido-bis[[oxido(oxo)silyl]oxy]silane hydrate Chemical compound O.[Mg+2].[Mg+2].[O-][Si](=O)O[Si]([O-])([O-])O[Si]([O-])=O FSBVERYRVPGNGG-UHFFFAOYSA-N 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910021513 gallium hydroxide Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
- HDMKAUUMGFGBRJ-UHFFFAOYSA-N iron;dihydrate Chemical compound O.O.[Fe] HDMKAUUMGFGBRJ-UHFFFAOYSA-N 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- IPJKJLXEVHOKSE-UHFFFAOYSA-L manganese dihydroxide Chemical compound [OH-].[OH-].[Mn+2] IPJKJLXEVHOKSE-UHFFFAOYSA-L 0.000 description 1
- PMQJYWORJJEMQC-UHFFFAOYSA-N manganese;dihydrate Chemical compound O.O.[Mn] PMQJYWORJJEMQC-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920001601 polyetherimide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- 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
- 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
- H01M50/291—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 their shape
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
- Thermal Insulation (AREA)
- Battery Mounting, Suspending (AREA)
- Laminated Bodies (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The present invention provides a heat transfer inhibiting sheet and a battery pack, wherein the heat transfer inhibiting sheet can inhibit powder removal and maintain excellent heat insulation. The heat transfer inhibiting sheet (10) comprises: a heat insulator (11) comprising inorganic particles; a resin film (12) which encloses the heat insulator (11) and has a plurality of first holes (14); and a cover (13) which is laminated on the resin film (12) and covers at least a part of the plurality of first holes (14).
Description
Technical Field
The present invention relates to a heat transfer suppressing sheet and a battery pack having the same.
Background
In recent years, development of electric vehicles, hybrid vehicles, and the like driven by electric motors has been actively conducted from the viewpoint of environmental protection. In such an electric vehicle, a hybrid vehicle, or the like, a battery pack including a plurality of battery cells connected in series or in parallel for use as a power source of a driving electric motor is mounted.
The battery unit mainly uses a lithium ion secondary battery which realizes high capacity and high output compared with a lead storage battery, a nickel-hydrogen battery and the like. In addition, when a battery cell rapidly increases in temperature due to an internal short circuit or overcharge of the battery, and then continues to generate heat, the heat from the battery cell in which the thermal runaway occurs propagates to other adjacent battery cells, which may cause thermal runaway of other battery cells.
As a method for suppressing the propagation of heat from the battery cells in which the thermal runaway described above has occurred, a method of interposing a heat insulating sheet between the battery cells is generally performed.
In addition, when a heat insulating sheet is produced by dry molding using inorganic particles such as dry silica or silica aerogel as a material of a heat insulating material, the inorganic particles may be separated (hereinafter also referred to as "powder separation") due to pressure, impact, or the like.
For example, patent document 1 discloses a thermal runaway battery cell shield having a fibrous matrix containing inorganic fibers, a nonwoven fibrous heat insulator of thermally insulating inorganic particles and a binder, and an organic sealing layer sealing the heat insulator. In addition, one or more vent holes are formed in the organic sealing layer so that the gas enclosed inside is discharged to the outside when heated to a high temperature.
Prior art literature
Patent literature
Patent document 1: international publication No. 2022/024776
Disclosure of Invention
Problems to be solved by the invention
However, in the battery cell thermal runaway shield described in patent document 1, a vent hole is formed to allow the gas enclosed inside to be discharged, and when the battery is used, moisture easily enters the inside through the vent hole. Specifically, the temperature of the interior of the battery case accommodating the battery cells and the like is likely to change, and therefore, if the heat insulating sheet is disposed in a high-temperature and high-humidity atmosphere, moisture may enter the interior through the vent hole, and the heat insulating property may be lowered.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a heat transfer suppressing sheet capable of suppressing powder removal and maintaining excellent heat insulation properties, and a battery pack including the heat transfer suppressing sheet.
Means for solving the problems
The above object of the present invention is achieved by the following configuration of [1] of the heat transfer control sheet.
[1] A heat transfer suppressing sheet, characterized in that,
The heat transfer inhibiting sheet has:
a thermal insulation comprising inorganic particles;
a resin film that encloses the heat insulator and has a plurality of first holes; and
And a cover member laminated on the resin film and covering at least a part of the plurality of first holes.
Further, preferred embodiments of the present invention related to the heat transfer suppressing sheet relate to the following [2] to [10].
[2] The heat transfer control sheet according to item [1], wherein the inner region enclosed by the resin film communicates with at least a part of the outer region of the heat transfer control sheet.
[3] The heat transfer suppressing sheet of [1] or [2], wherein the resin film comprises at least one resin selected from the group consisting of polyethylene, polypropylene, polystyrene, polyethylene terephthalate and vinyl chloride.
[4] The heat transfer control sheet according to any one of [1] to [3], wherein the cover comprises at least one resin selected from the group consisting of polyethylene, polypropylene, polystyrene, polyethylene terephthalate and vinyl chloride.
[5] The heat transfer control sheet according to any one of [1] to [4], wherein the resin film comprises: a main surface side portion located on a main surface side of the heat insulator perpendicular to a thickness direction; and an end face side portion covering an end face side of the heat insulator, the end face side being substantially parallel to a thickness direction,
The first hole is formed at least on the side of the main surface,
The cover is laminated on at least a part of the main surface side portion.
[6] The heat transfer control sheet according to any one of [1] to [5], wherein the cover member is bonded to the resin film.
[7] The heat transfer control sheet according to any one of [1] to [6], wherein the cover member has a plurality of second holes, and the heat insulating material and the resin film are enclosed inside,
At least a part of the plurality of second holes is arranged at a position offset from the plurality of first holes when viewed in the lamination direction of the resin film and the cover.
[8] The heat transfer control sheet according to any one of [1] to [7], wherein the heat transfer control sheet further comprises an elastic sheet laminated on the heat insulator,
A laminate formed by laminating the heat insulating material and the elastic sheet is enclosed in the resin film.
[9] The heat transfer control sheet according to any one of [1] to [8], wherein the heat insulating material has a thermal conductivity of less than 1W/mK.
[10] The heat transfer control sheet according to any one of [1] to [9], wherein the heat insulating material further comprises at least one selected from the group consisting of inorganic fibers, organic fibers and organic particles.
The above object of the present invention is achieved by the following configuration of [11] of the battery pack.
[11] A battery pack having a plurality of battery cells connected in series or in parallel and a heat transfer suppressing sheet according to any one of [1] to [10 ].
Effects of the invention
The heat transfer suppressing sheet of the present invention has a heat insulating material containing inorganic particles and a resin film that encloses the heat insulating material, and therefore can obtain an excellent heat insulating effect and suppress powder removal. Further, since at least a part of the hole formed in the resin film is covered with the cover, it is possible to suppress penetration of moisture existing outside the heat transfer suppressing sheet into the region of the heat insulator, and to suppress a decrease in heat insulating property.
According to the battery pack of the present invention, since the heat transfer suppressing sheet having excellent heat insulating properties and a powder removal suppressing effect as described above and suppressing the penetration of moisture is provided, thermal runaway of the battery cells and expansion of flame to the outside of the battery case in the battery pack can be suppressed while maintaining excellent heat insulating properties.
Drawings
Fig. 1A and 1B show a heat transfer control sheet according to a first embodiment of the present invention, wherein fig. 1A is a perspective view and fig. 1B is a sectional view taken along line I-I thereof.
Fig. 2 is a cross-sectional view schematically showing a battery pack to which the heat transfer suppression sheet of the first embodiment is applied.
Fig. 3A and 3B show a heat transfer control sheet according to a second embodiment of the present invention, wherein fig. 3A is a plan view and fig. 3B is a cross-sectional view taken along line II-II.
Description of the reference numerals
10. 40: A heat transfer inhibiting sheet;
11a: a main surface;
11b, 11c: an end face;
11: a heat insulating member;
12a, 23a: a main surface side portion;
12b, 12c: an end face side portion;
12: a resin film;
13. 23: a cover;
14: a first hole;
15: a second hole;
16: a fusion joint;
17: a gap portion;
20a, 20b, 20c: a battery unit;
30: a battery case;
100: and (5) assembling a battery.
Detailed Description
The present inventors have found that in a heat transfer control sheet comprising a heat insulator and a resin film that encloses the heat insulator, it is effective to solve the problem that a plurality of holes are formed in the resin film on the main surface side of the heat insulator and at least a part of the holes is covered with a cover.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments described below, and can be arbitrarily modified and implemented without departing from the scope of the present invention.
[1. Heat transfer inhibiting sheet ]
< First embodiment >
Fig. 1A and 1B show a heat transfer control sheet according to a first embodiment of the present invention, wherein fig. 1A is a perspective view and fig. 1B is a sectional view taken along line I-I thereof. Fig. 2 is a cross-sectional view schematically showing a battery pack to which the heat transfer suppression sheet according to the first embodiment is applied.
The heat transfer suppression sheet 10 of the first embodiment includes: a heat insulator 11 containing inorganic particles, a resin film 12 that encloses the heat insulator 11, and a cover 13 laminated on the resin film 12. The heat insulator 11 has a pair of main surfaces 11a perpendicular to the thickness direction thereof and two opposite end surfaces 11b, 11c substantially parallel to the thickness direction.
The resin film 12 has a main surface side portion 12a located on the main surface 11a side of the heat insulator 11 and end surface side portions 12b, 12c covering the end surfaces 11b, 11c side, and the resin film 12 covers the entire surface of the heat insulator 11. In the present embodiment, the resin film 12 that shrinks due to heat is used, and the resin film 12 is heat-shrunk (shrink-wrapped) to bring the resin film 12 into close contact with the surface of the heat insulator 11. In this case, a plurality of first holes 14 are formed in the main surface side portion 12a of the resin film 12 in order to discharge the air in the inner region of the resin film 12 to the outside. In addition, the resin films 12 are welded to each other at the end face side portions 12b, 12c, thereby forming the welded portion 16.
A cover 13 is laminated on the outer surface of the main surface side portion 12a of the resin film 12, and the cover 13 and the resin film 12 are bonded together by an adhesive. Thereby, at least a portion of the first hole 14 is covered by the cover 13.
The structure of the heat transfer control sheet 10 configured as described above when applied to a battery pack will be described below with reference to fig. 2. As shown in fig. 2, the heat transfer suppression sheet 10 of the present embodiment is used for a battery pack, for example. The battery pack 100 includes a battery case 30 and a plurality of battery cells 20a, 20b, and 20c accommodated in the battery case 30. The heat transfer suppressing sheet 10 is interposed between the battery cells 20a and 20b and between the battery cells 20b and 20c. The plurality of battery cells 20a, 20b, 20c are connected in series or in parallel by bus bars or the like, not shown.
The battery cells 20a, 20b, and 20c are preferably lithium ion secondary batteries, for example, but are not particularly limited thereto, and can be applied to other secondary batteries.
In the first embodiment configured as described above, the heat insulator 11 is enclosed by the resin film 12, so that it is possible to prevent particles and the like from falling off when the heat transfer suppression sheet 10 is assembled to the battery pack 100 or when the battery pack 100 is used. Further, since the heat insulator 11 contains inorganic particles and has high heat insulating properties, it is possible to suppress heat transfer from the battery cell in which thermal runaway occurs to the adjacent battery cell.
Further, according to the first embodiment, since the first hole 14 of the resin film 12 is covered with the cover 13, even when the temperature inside the battery case changes to a high humidity atmosphere, the heat insulator 11 can be prevented from absorbing moisture. Therefore, the heat insulating property of the heat insulator 11 can be suppressed from being lowered.
In the first embodiment, the cover 13 and the resin film 12 are bonded together by an adhesive, but when the surface of the resin film 12 is not completely smooth, a gap 17 may be formed between the cover 13 and the resin film 12. When the heat insulator 11 is covered with the shrink-wrap resin film 12, a first hole, not shown, may be formed in the end face side 12c of the resin film 12 depending on the manufacturing method. In this case, the structure is as follows: the inner region enclosed in the resin film 12 communicates with the outer region of the heat transfer suppressing sheet 10 at least partially through the first holes 14 and the gap 17, or through the first holes 14, or the like. As a result, when the heat transfer control sheet 10 is heated to a high temperature due to the temperature rise of the battery cells 20a, 20b, and 20c, the internal gas can be discharged to the outside.
On the other hand, in the first embodiment, the cover 13 is completely in close contact with the resin film 12 without any gap, and when no further hole is formed in the end face side portion 12c of the resin film 12, the penetration of moisture in the battery case 30 into the heat transfer suppressing sheet 10 can be completely prevented.
In the present embodiment, the cover 13 having the same size as the main surface side portion 12a is disposed on the main surface side portion 12a of the resin film 12 by adhesion, but the position and size of the cover 13 are not limited thereto. For example, the cover 13 having a smaller size than the main surface side 12a may be bonded to at least a partial region of the main surface side 12a of the resin film 12. However, if there is a step between the resin film 12 and the cover 13, the contact surfaces with the battery cells 20a, 20b, and 20c may have uneven shapes, which may affect the battery performance. Therefore, it is preferable that the cover 13 has substantially the same size as the main surface side portion 12a, or that the cover 13 having a larger size than the main surface side portion 12a is arranged so that at least the entire surface of the main surface side portion 12a of the resin film 12 can be covered with the cover 13.
The cover 13 may be disposed between the heat insulator 11 and the resin film 12. The cover 13 may be disposed so as to surround the pair of main surface side portions 12a and the pair of end surface side portions 12c of the resin film 12, whereby all of the first holes 14 in the resin film 12 can be covered with the cover 13. The cover 13 may be disposed between the heat insulator 11 and the resin film 12. However, in order to obtain a sufficient effect of suppressing the penetration of water into the inner region enclosed in the resin film 12, the cover 13 is preferably disposed so as to cover the outer surface of the resin film 12.
< Second embodiment >
Fig. 3A and 3B show a heat transfer control sheet according to a second embodiment of the present invention, wherein fig. 3A is a plan view and fig. 3B is a cross-sectional view taken along line II-II. In the second embodiment shown in fig. 3A and 3B, the same reference numerals are given to the same components as those of the first embodiment shown in fig. 1A and 1B, and detailed description thereof is omitted or simplified. In fig. 3A and 3B, the welded portion 16 shown in fig. 1A and 1B is omitted. Next, a case will be described in which the heat transfer suppression sheet according to the second embodiment is applied to the battery pack 100 shown in fig. 2.
As shown in fig. 3A and 3B, in the heat transfer control sheet 40 of the second embodiment, the main surface 11a and the end surfaces 11B, 11c of the heat insulator 11 are covered with the resin film 12 by shrink packaging. The main surface side portion 12a and the end surface side portions 12b and 12c of the resin film 12 are covered with the cover member 23 by shrink-wrapping. A plurality of second holes 15 are formed in the main surface side portion 23a of the cover 23 to discharge the air inside to the outside at the time of shrink-wrapping of the cover 23. In addition, at least a part of the plurality of second holes 15 is arranged at a position offset from the plurality of first holes 14 when viewed in the lamination direction of the resin film 12 and the cover 13, that is, in the plan view shown in fig. 3A.
In the second embodiment thus constituted, the heat insulator 11 is also covered with the resin film 12, so that powder falling off can be suppressed. Further, since the first hole 14 and the second hole 15 are formed at positions offset from each other, the first hole 14 of the resin film 12 is covered with the cover 23, and thus the surface of the heat insulator 11 is not exposed. Therefore, the penetration of moisture into the region of the heat insulator 11 can be suppressed, and the decrease in heat insulating properties can be suppressed.
In the second embodiment, the cover 13 is not completely bonded to the resin film 12, and the cover 13 is made of a film that shrinks by heat, so that the cover 13 is brought into close contact with the resin film 12 by heat shrinkage. Therefore, a minute gap portion 17 is provided between the resin film 12 and the cover 13, and the region where the heat insulator 11 enclosed by the resin film 12 is located communicates with the outer region of the heat transfer suppressing sheet 40 through the first hole 14, the gap portion 17, and the second hole 15. Therefore, when the heat transfer inhibiting sheet 40 is heated to a high temperature due to the temperature rise of the battery cells 20a, 20b, 20c, the gas in the inner region enclosed in the resin film 12 can be discharged to the outside.
< Third embodiment >
In the first and second embodiments described above, only the heat insulator 11 is enclosed in the resin film 12, whereas in the third embodiment, a laminate of the heat insulator 11 and the elastic sheet is enclosed in the resin film 12. In the third embodiment having the elastic sheet having such a structure, the heat insulator 11 is replaced with a laminate in fig. 1A and 1B to 3A and 3B, and therefore, the description can be made in the same manner as in the first and second embodiments, and therefore, the detailed drawings are omitted. When the elastic sheets are laminated on the heat insulator 11, the heat insulator may be disposed between the pair of elastic sheets, or the elastic sheets may be disposed between the pair of heat insulators.
In this way, when the laminate having the elastic sheet is wrapped inside the resin film 12, the resin film 12 can suppress the occurrence of misalignment between the heat insulator and the elastic sheet. The elastic piece has a predetermined elasticity, and when the heat transfer suppressing piece is pressed by the expansion of the battery cell, the elastic piece is deformed by an appropriate amount, so that the reaction force to the battery cell can be suppressed. Therefore, the degradation of the battery performance due to repeated pressing and relaxation of the battery cells can be suppressed.
In the first to third embodiments, the resin film 12 is formed into a shape that covers the surface of the heat insulator 11 or the laminate by shrink packaging using heat shrinkage, but the present invention is not limited to shrink packaging. For example, after the surface of the heat insulator 11 (laminate) is packed with the resin films 12, the stacked resin films 12 may be bonded to each other by heat or an adhesive. Even in such a structure, if the first holes are not formed in the resin film 12, air may remain in the inner region after bonding, and therefore, it is preferable to form the first holes 14 in the resin film 12, and the structure of the present invention can be used favorably.
Next, material examples constituting the heat transfer control sheet according to the first to third embodiments will be described in detail.
[ Resin film ]
As a material constituting the resin film 12, at least one resin selected from polyethylene, polypropylene, polystyrene, vinyl chloride, nylon, acrylic, epoxy, polyurethane, polyetheretherketone, polyetherimide, polyethylene terephthalate, polyphenylene sulfide, polycarbonate, and aramid may be selected.
As in the first to third embodiments, when the entire surface of the heat insulator 11 or the laminate including the heat insulator 11 and the elastic sheet is covered with the resin film 12, shrink packaging is preferably used. Therefore, it is more preferable to use the resin film 12 having a material suitable for shrink packaging. Examples of such materials include polyethylene, polypropylene, polystyrene, polyethylene terephthalate, and vinyl chloride.
(Thickness of resin film)
If the thickness of the resin film 12 exceeds 1mm, it is difficult to follow the shape of the heat insulator 11, and cracks or fractures may occur in the resin film 12. Therefore, the thickness of the resin film 12 is preferably 1mm or less, more preferably 0.1mm or less, and still more preferably 0.05mm or less.
On the other hand, the lower limit of the thickness of the resin film 12 is not particularly limited, but is preferably 0.005mm or more, more preferably 0.01mm or more, in order to obtain a desired strength.
< Other materials contained in resin film >
Further, since the resin film 12 is required to have resistance against the battery cells 20a, 20b, and 20c which are heated, it is preferable to have flame retardancy, and specifically, it is preferable to include an inorganic substance or a flame retardant material. Examples of the other materials contained in the resin film 12 include talc, calcium carbonate, aluminum hydroxide, titanium oxide, vermiculite, zeolite, synthetic silica, zirconia, zircon, barium titanate, zinc oxide, and alumina, and examples of the flame retardant include bromine flame retardant, chlorine flame retardant, phosphorus flame retardant, boron flame retardant, silicone flame retardant, and nitrogen-containing compound.
[ Covering piece ]
The material constituting the covers 13 and 23 is the same as the resin film 12, but a material composed of the same material as the resin film 12 may be used, or a material composed of different materials may be used. As shown in fig. 3A and 3B, when the cover member 23 is adhered to the surface of the resin film 12 by shrink-wrapping, a material suitable for the shrink-wrapping is preferably contained as the cover member 23.
[ Elastic sheet ]
As described in the third embodiment, when the laminate of the elastic sheet and the heat insulator 11 is enclosed by the resin film 12, a known elastic sheet can be used as the elastic sheet. Specifically, a sheet formed of rubber or thermoplastic elastomer having elasticity that flexibly deforms with respect to the deformation of the battery cells 20a, 20b, 20c can be used.
The rubber may be any of synthetic rubber and natural rubber, and examples of the synthetic rubber include styrene butadiene rubber, chloroprene rubber, isoprene rubber, butyl rubber, ethylene propylene rubber, nitrile rubber, silicone rubber, fluoro rubber, acrylic rubber, urethane rubber, polysulfide rubber, epichlorohydrin rubber, and foaming organic silicone.
Examples of the thermoplastic elastomer include polystyrene-based, polyolefin-based, vinyl chloride-based, polyurethane-based, polyester-based, polyamide-based, and polybutadiene-based thermoplastic elastomers. In addition, the elastomer may be either porous or non-porous. In the case of the porous elastomer, the bubble structure may be either of an independent bubble type and a connected bubble type.
(Size of elastic sheet)
The thickness of the elastic sheet is not particularly limited, but is preferably 1mm to 10mm in order to effectively obtain the effect on the elastic sheet.
[ Heat insulator ]
The heat insulator 11 used in the heat transfer control sheet of the present embodiment is not particularly limited as long as it has a heat insulating effect. The thermal conductivity is preferably less than 1 (W/m·k), more preferably less than 0.5 (W/m·k), and even more preferably less than 0.2 (W/m·k). The thermal conductivity of the heat insulator is more preferably less than 0.1 (W/m·k), still more preferably less than 0.05 (W/m·k), and particularly preferably less than 0.02 (W/m·k).
The thermal conductivity of the heat insulator can be measured according to "test method for thermal conductivity of refractory" described in JIS R2251.
(Size of heat insulating member)
When the heat insulator 11 and the elastic sheet are laminated, the size of the main surface 11a of the heat insulator 11 and the size of the main surface of the elastic sheet perpendicular to the thickness direction are preferably substantially the same, but are not particularly limited.
The heat insulator 11 contains inorganic particles, and as other components, for example, a heat insulator containing at least 1 kind selected from inorganic fibers, organic fibers, and organic particles can be used. Specific examples of each are shown below.
< Inorganic particles >
As the inorganic particles, a single inorganic particle may be used, or two or more inorganic particles may be used in combination. As the kind of the inorganic particles, particles composed of at least one inorganic material selected from the group consisting of oxide particles, carbide particles, nitride particles and inorganic hydrate particles are preferably used, and oxide particles are more preferably used, from the viewpoint of heat transfer inhibition effect. The shape is not particularly limited, and at least one selected from the group consisting of nanoparticles, hollow particles and porous particles is preferably contained, and specifically, inorganic hollow spheres such as silica nanoparticles, metal oxide particles, microporous particles, hollow silica particles, particles formed of a thermally expandable inorganic material, particles formed of an aqueous porous body, and the like may also be used.
When the average secondary particle diameter of the inorganic particles is 0.01 μm or more, the inorganic particles can be easily obtained, and an increase in production cost can be suppressed. When the thickness is 200 μm or less, a desired heat insulating effect can be obtained. Therefore, the average secondary particle diameter of the inorganic particles is preferably 0.01 μm or more and 200 μm or less, more preferably 0.05 μm or more and 100 μm or less.
Further, if two or more kinds of inorganic particles having different heat transfer inhibition effects are used in combination, the heat generating element can be cooled in multiple stages, and the heat absorbing effect can be exhibited in a wider temperature range. Specifically, it is preferable to mix large-diameter particles and small-diameter particles. For example, in the case of using nanoparticles as one kind of inorganic particles, it is preferable to include inorganic particles composed of a metal oxide as the other kind of inorganic particles. Hereinafter, the inorganic particles will be described in more detail with respect to the small-diameter inorganic particles as the first inorganic particles and the large-diameter inorganic particles as the second inorganic particles.
< First inorganic particles >
(Oxide particles)
Since the oxide particles have a high refractive index and have a strong effect of diffuse reflection of light, if the oxide particles are used as the first inorganic particles, radiation heat transfer can be suppressed particularly in a high temperature region such as abnormal heat generation. As the oxide particles, at least one particle selected from silica, titania, zirconia, zircon, barium titanate, zinc oxide, and aluminum oxide can be used. That is, among the above oxide particles that can be used as inorganic particles, only one kind of oxide particles may be used, or two or more kinds of oxide particles may be used. In particular, silica is a component having high heat insulation, and titania is a component having a higher refractive index than other metal oxides, and has a high effect of shielding radiant heat by diffuse reflection of light in a high temperature region of 500 ℃ or higher, so that silica and titania are most preferably used as oxide particles.
( Average primary particle diameter of oxide particles: 0.001 μm or more and 50 μm or less )
Since the particle size of the oxide particles may affect the effect of reflecting radiant heat, if the average primary particle size is limited to a predetermined range, higher heat insulation properties can be obtained.
That is, when the average primary particle diameter of the oxide particles is 0.001 μm or more, the wavelength of light contributing to heating is sufficiently larger, and light is efficiently diffusely reflected, so that radiation heat transfer of heat in the heat transfer suppression sheet is suppressed in a high temperature region of 500 ℃ or more, and heat insulation properties can be further improved.
On the other hand, when the average primary particle diameter of the oxide particles is 50 μm or less, the number of contact points between the particles does not increase even when the particles are compressed, and it is difficult to form a path for conducting heat transfer, so that the influence on the heat insulating property in a normal temperature region where conducting heat transfer is dominant can be reduced in particular.
In the present invention, the average primary particle diameter can be obtained by observing the particles with a microscope and comparing the particles with a standard scale to obtain an average value of any 10 particles.
(Nanoparticles)
In the present invention, nanoparticles mean particles of nanoscale having a mean primary particle diameter of less than 1 μm which are spherical or nearly spherical. Since the nanoparticles have a low density, conduction heat transfer is suppressed, and if the nanoparticles are used as the first inorganic particles, finer voids are dispersed, so that excellent heat insulation properties can be obtained in which convection heat transfer is suppressed. Therefore, it is preferable to use nanoparticles in view of suppressing heat conduction between adjacent nanoparticles when the battery is used in a normal temperature region.
Further, if nanoparticles having a small average primary particle diameter are used as the oxide particles, even when the heat transfer suppressing sheet is compressed due to expansion associated with thermal runaway of the battery cells and the density of the inside increases, the increase in conduction heat transfer of the heat transfer suppressing sheet can be suppressed. The reason for this is considered that the nanoparticles are likely to form fine voids between particles due to repulsive force generated by static electricity, and the volume density is low, so that the particles are filled so as to have cushioning properties.
In the case of using nanoparticles as the first inorganic particles, the material is not particularly limited as long as the definition of the nanoparticles is satisfied. For example, since silica nanoparticles are a material having high heat insulation properties and the contact points between particles are small, the amount of heat conducted by silica nanoparticles is smaller than in the case of using silica particles having a large particle diameter. Further, since the bulk density of the silica nanoparticles obtained in general is about 0.1 (g/cm 3), for example, even when the battery cells disposed on both sides of the heat transfer inhibitor are thermally expanded and a large compressive stress is applied to the heat transfer inhibitor, the size (area) and the number of contact points between the silica nanoparticles do not significantly increase, and heat insulation can be maintained. Therefore, as the nanoparticles, silica nanoparticles are preferably used. Examples of silica nanoparticles include wet silica, dry silica, and aerogel, and silica nanoparticles particularly preferred in the present embodiment are described below.
In general, particles of wet silica are agglomerated, whereas dry silica can disperse the particles. In the temperature range of 90 ℃ or less, heat conduction is mainly conduction heat conduction, and therefore, the dry silica in which particles are dispersed can obtain excellent heat insulating performance as compared with wet silica.
The heat transfer control sheet of the present embodiment is preferably manufactured by processing a mixture containing a material into a sheet shape by a dry method. Therefore, as the inorganic particles, dry silica, silica aerogel, or the like having low thermal conductivity is preferably used.
( Average primary particle diameter of nanoparticles: 1nm to 100nm )
When the average primary particle diameter of the nanoparticles is limited to a predetermined range, higher heat insulation properties can be obtained.
That is, when the average primary particle diameter of the nanoparticles is 1nm or more and 100nm or less, in particular, in a temperature range of less than 500 ℃, the convective heat transfer and the conductive heat transfer of heat in the heat transfer inhibition sheet can be inhibited, and the heat insulation can be further improved. In addition, even when compressive stress is applied, the contact points between the void portions remaining between the nanoparticles and the plurality of particles can suppress conduction heat transfer, and the heat insulating property of the heat transfer suppressing sheet can be maintained.
The average primary particle diameter of the nanoparticles is more preferably 2nm or more, and still more preferably 3nm or more. On the other hand, the average primary particle diameter of the nanoparticles is more preferably 50nm or less, and still more preferably 10nm or less.
(Inorganic hydrate particles)
When the inorganic hydrate particles receive heat from the heat generating element and reach a temperature equal to or higher than the thermal decomposition start temperature, thermal decomposition occurs, and crystal water contained in the inorganic hydrate particles is released to lower the temperature of the heat generating element and its surroundings, and a so-called "endothermic effect" is exhibited. In addition, the porous body is formed by discharging crystal water, and the porous body exhibits a heat insulating effect through numerous air holes.
Specific examples of the inorganic hydrate include aluminum hydroxide (Al (OH) 3), magnesium hydroxide (Mg (OH) 2), calcium hydroxide (Ca (OH) 2), zinc hydroxide (Zn (OH) 2), iron hydroxide (Fe (OH) 2), manganese hydroxide (Mn (OH) 2), zirconium hydroxide (Zr (OH) 2), gallium hydroxide (Ga (OH) 3), and the like.
For example, aluminum hydroxide has about 35% of crystal water, and undergoes thermal decomposition to release crystal water, as shown in the following formula, and exhibits a heat absorbing effect. The crystal water is released to form alumina (Al 2O3) as a porous body, and the porous body functions as a heat insulator.
2Al(OH)3→Al2O3+3H2O
As described above, the heat transfer suppressing sheet 10 is preferably interposed between the battery cells, but in the battery cells in which thermal runaway occurs, the temperature rapidly rises to a temperature exceeding 200 ℃, and the temperature continues to rise to around 700 ℃. Therefore, the inorganic particles contained in the heat insulator are preferably composed of inorganic hydrate having a thermal decomposition start temperature of 200 ℃ or higher.
Regarding the above-listed thermal decomposition start temperatures of the inorganic hydrates, aluminum hydroxide is about 200 ℃, magnesium hydroxide is about 330 ℃, calcium hydroxide is about 580 ℃, zinc hydroxide is about 200 ℃, iron hydroxide is about 350 ℃, manganese hydroxide is about 300 ℃, zirconium hydroxide is about 300 ℃, gallium hydroxide is about 300 ℃, and all of them substantially overlap the temperature range in which rapid temperature rise of the battery cells in which thermal runaway occurs, and thus it can be said that the inorganic hydrates are preferable because the temperature rise can be effectively suppressed.
( Average secondary particle diameter of inorganic hydrate particles: 0.01 μm or more and 200 μm or less )
In addition, in the case of using inorganic hydrate particles as the first inorganic particles, if the average particle diameter thereof is too large, it takes a certain amount of time until the first inorganic particles (inorganic hydrate) located near the center of the heat insulator reach their thermal decomposition temperature, and therefore the first inorganic particles near the center of the heat insulator may not be completely thermally decomposed. Therefore, the average secondary particle diameter of the inorganic hydrate particles is preferably 0.01 μm or more and 200 μm or less, more preferably 0.05 μm or more and 100 μm or less.
(Particles made of thermally-expansive inorganic Material)
Examples of the thermally expandable inorganic material include vermiculite, bentonite, mica, and perlite.
(Particles comprising an aqueous porous body)
Specific examples of the aqueous porous material include zeolite, kaolinite, montmorillonite, acid clay, diatomaceous earth, wet silica, dry silica, aerogel, mica, and vermiculite.
(Inorganic hollow sphere)
The heat insulator used in the present invention may contain inorganic hollow spheres as the first inorganic particles.
When the inorganic hollow spheres are contained, the convective heat transfer or the conductive heat transfer of heat in the heat insulator can be suppressed in a temperature range lower than 500 ℃, and the heat insulating property of the heat insulator can be further improved.
As the inorganic hollow spheres, at least one selected from the group consisting of white sand hollow spheres, silica hollow spheres, fly ash hollow spheres, barite hollow spheres, and glass hollow spheres can be used.
( Content of inorganic hollow spheres: 60 mass% or less relative to the total mass of the heat insulating material )
The content of the inorganic hollow spheres is preferably 60 mass% or less relative to the total mass of the heat insulator.
( Average particle diameter of inorganic hollow spheres: 1 μm or more and 100 μm or less )
The average particle diameter of the inorganic hollow spheres is preferably 1 μm or more and 100 μm or less.
< Second inorganic particles >
In the case where two kinds of inorganic particles are contained in the heat transfer controlling sheet 10, the second inorganic particles are not particularly limited as long as the material, particle diameter, and the like are different from those of the first inorganic particles. As the second inorganic particles, inorganic hollow spheres such as oxide particles, carbide particles, nitride particles, inorganic hydrate particles, silica nanoparticles, metal oxide particles, microporous particles, hollow silica particles, particles composed of a thermally expandable inorganic material, particles composed of an aqueous porous body, or the like can be used, and their details are as described above.
In addition, the nanoparticle has extremely low conduction heat transfer, and can maintain excellent heat insulation even when compressive stress is applied to the heat transfer suppressing sheet. In addition, metal oxide particles such as titanium dioxide have a high effect of shielding radiant heat. Further, if large-diameter inorganic particles and small-diameter inorganic particles are used, the small-diameter inorganic particles enter gaps between the large-diameter inorganic particles, and thus a more compact structure is obtained, and the heat transfer suppressing effect can be improved. Therefore, in the case of using, for example, nanoparticles as the first inorganic particles, it is preferable that particles composed of a metal oxide having a larger diameter than the first inorganic particles be further contained as the second inorganic particles in the heat transfer suppressing sheet.
Examples of the metal oxide include silicon oxide, titanium oxide, aluminum oxide, barium titanate, zinc oxide, zircon, and zirconium oxide. In particular, titanium oxide (titanium dioxide) is a component having a higher refractive index than other metal oxides, and has a high effect of shielding radiant heat by diffuse reflection of light in a high temperature range of 500 ℃ or higher, and thus titanium dioxide is most preferably used.
When at least one particle selected from the group consisting of dry silica particles and silica aerogel is used as the first inorganic particle and at least one particle selected from the group consisting of titanium dioxide, zircon, zirconia, silicon carbide, zinc oxide and alumina is used as the second inorganic particle, the first inorganic particle is preferably 50 mass% or more, more preferably 60 mass% or more, and even more preferably 70 mass% or more, with respect to the total mass of the inorganic particles, in order to obtain excellent heat insulating performance in a temperature range of 90 ℃ or less. The first inorganic particles are preferably 95 mass% or less, more preferably 90 mass% or less, and still more preferably 80 mass% or less, based on the total mass of the inorganic particles.
On the other hand, in order to obtain excellent heat insulating performance in a temperature range exceeding 90 ℃, the second inorganic particles are preferably 5 mass% or more, more preferably 10 mass% or more, and still more preferably 20 mass% or more with respect to the total mass of the inorganic particles. The second inorganic particles are preferably 50 mass% or less, more preferably 40 mass% or less, and still more preferably 30 mass% or less, based on the total mass of the inorganic particles.
(Average primary particle diameter of the second inorganic particles)
In the case where the second inorganic particles made of a metal oxide are contained in the heat transfer suppressing sheet, if the second inorganic particles have an average primary particle diameter of 1 μm or more and 50 μm or less, radiation heat transfer can be effectively suppressed in a high temperature region of 500 ℃ or more. The average primary particle diameter of the second inorganic particles is more preferably 5 μm or more and 30 μm or less, and most preferably 10 μm or less.
(Content of inorganic particles)
In the present embodiment, if the total content of the inorganic particles in the heat insulator is appropriately controlled, the heat insulating property of the heat insulator can be sufficiently ensured.
The total content of the inorganic particles is preferably 60 mass% or more, more preferably 70 mass% or more, relative to the total mass of the heat insulator. In addition, if the total content of the inorganic particles is too large, the content of the organic fibers is relatively reduced, so that the total content of the inorganic particles is preferably 95 mass% or less, more preferably 90 mass% or less, relative to the total mass of the heat insulator, in order to sufficiently obtain the reinforcing effect of the skeleton and the retaining effect of the inorganic particles.
The content of the inorganic particles in the heat insulator can be calculated by, for example, heating the heat insulator at 800 ℃ to decompose the organic components and then measuring the mass of the remaining portion.
< Inorganic fiber >
As the inorganic fibers, a single inorganic fiber may be used, or two or more inorganic fibers may be used in combination. Examples of the inorganic fibers include: ceramic-based fibers such as silica fibers, alumina fibers, aluminum silicate fibers, zirconia fibers, carbon fibers, soluble fibers, refractory ceramic fibers, aerogel composite materials, magnesium silicate fibers, alkaline earth silicate fibers, potassium titanate fibers, silicon carbide fibers, and potassium titanate whisker fibers; glass fibers such as glass fibers, glass wool, and slag wool; natural mineral fibers such as rock wool, basalt fiber, wollastonite and mullite fiber.
These inorganic fibers are preferable in terms of heat resistance, strength, availability, and the like. Among the inorganic fibers, silica-alumina fibers, silica fibers, rock wool, alkaline earth silicate fibers, and glass fibers are particularly preferable from the viewpoint of handleability.
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, a core cross-section, and the like. Among them, a fiber having a special-shaped cross section, which has a hollow cross section, a flat cross section, or a polygonal cross section, is preferably used because of its slightly high heat insulation.
(Average fiber length of inorganic fibers)
The preferable lower limit of the average fiber length of the inorganic fibers is 0.1mm, and the more preferable lower limit is 0.5mm. On the other hand, the preferable upper limit of the average fiber length of the inorganic fibers is 50mm, and the more preferable upper limit is 10mm. If the average fiber length of the inorganic fibers is less than 0.1mm, entanglement of the inorganic fibers is difficult to occur, and there is a possibility that the mechanical strength of the heat insulating material may be lowered. On the other hand, if the thickness exceeds 50mm, the reinforcing effect can be obtained, but the inorganic fibers cannot be tightly entangled with each other or only a single inorganic fiber is curled, which may result in a decrease in heat insulation.
The preferable lower limit of the average fiber diameter of the inorganic fibers is 1. Mu.m, the more preferable lower limit is 2. Mu.m, and the more preferable lower limit is 3. Mu.m. On the other hand, the preferable upper limit of the average fiber diameter of the inorganic fibers is 15 μm, and the more preferable upper limit is 10 μm. When the average fiber diameter of the inorganic fibers is smaller than 1. Mu.m, there is a possibility that the mechanical strength of the inorganic fibers themselves may be lowered. In addition, the average fiber diameter of the inorganic fibers is preferably 3 μm or more from the viewpoint of influence on human health. On the other hand, when the average fiber diameter of the inorganic fibers is larger than 15 μm, solid heat transfer using the inorganic fibers as a medium increases, which may result in a decrease in heat insulation properties and a decrease in moldability and strength of the heat transfer inhibiting sheet.
(Content of inorganic fiber)
In the present embodiment, when the heat insulator contains inorganic fibers, the content of the inorganic fibers is preferably 3 mass% or more and 15 mass% or less with respect to the total mass of the heat insulator.
The content of the inorganic fiber is more preferably 5 mass% or more and 10 mass% or less with respect to the total mass of the heat insulator. By setting the content to such a level, the shape retention, pressing force resistance, wind pressure resistance, and retention ability of the inorganic particles of the inorganic fiber are uniformly exhibited. In addition, by properly controlling the content of the inorganic fibers, the organic fibers and the inorganic fibers are entangled with each other to form a three-dimensional network, and thus the effect of holding the inorganic particles and other compounding materials described later can be further improved.
< Organic fiber >
The organic fiber has an effect of imparting flexibility to the heat insulating member, and by forming a skeleton from the organic fiber, an effect of improving the strength of the heat insulating member is provided. Further, when inorganic particles and other organic fibers are deposited on the surface of the organic fibers, the effect of improving the strength of the sheet and the effect of maintaining the shape can be further improved. When the heat insulator contains an appropriate amount of organic fibers, a plurality of voids are formed in the heat insulator, and when the heat insulator is heated, air and moisture can be released to the outside through the voids.
As the material of the organic fiber in the heat insulator, a single-component organic fiber such as cellulose fiber may be used, but a binder fiber having a core-sheath structure is preferably used. The binder fiber of the core-sheath structure has a core portion extending in the longitudinal direction of the fiber and a sheath portion formed so as to cover the outer peripheral surface of the core portion. In this case, the core portion is made of a first organic material, the sheath portion is made of a second organic material, and the melting point of the first organic material is higher than that of the second organic material.
(First organic Material)
In the present embodiment, when the binder fiber having a core-sheath structure is used, the first organic material constituting the core is not particularly limited as long as the melting point is higher than the melting point of the second organic material which is the sheath portion present on the outer peripheral surface of the core. The first organic material may be at least one selected from polyethylene terephthalate, polypropylene and nylon.
(Second organic Material)
The second organic material is not particularly limited as long as the melting point is lower than that of the first organic material constituting the organic fiber. The second organic material may be at least one selected from polyethylene terephthalate, polyethylene, polypropylene, and nylon.
The melting point of the second organic material is preferably 90 ℃ or higher, more preferably 100 ℃ or higher. The melting point of the second organic material is preferably 150 ℃ or lower, more preferably 130 ℃ or lower.
(Content of organic fiber)
If the content of the organic fiber in the heat insulator is properly controlled, the reinforcing effect of the skeleton can be sufficiently obtained.
The content of the organic fiber is preferably 5 mass% or more, more preferably 10 mass% or more, relative to the total mass of the heat insulator. In addition, if the content of the organic fiber is too large, the content of the inorganic particles is relatively reduced, so that the content of the organic fiber is preferably 25 mass% or less, more preferably 20 mass% or less, with respect to the total mass of the heat insulator in order to obtain a desired heat insulating performance.
(Fiber length of organic fiber)
The fiber length of the organic fiber is not particularly limited, but from the viewpoint of securing moldability and processability, the average fiber length of the organic fiber is preferably 10mm or less.
On the other hand, the average fiber length of the organic fibers is preferably 0.5mm or more from the viewpoint of ensuring the compressive strength of the heat transfer control sheet by making the organic fibers function as a skeleton.
< Organic particles >
As the organic particles, hollow polystyrene particles or the like can be used.
< Other compounding materials >
(Hot melt powder)
The heat transfer controlling sheet may contain a hot melt powder in addition to the binder fibers and the inorganic particles. The hot-melt powder contains, for example, a third organic material different from the first organic material and the second organic material, and is a powder having a property of melting by heating. The mixture is heated while containing the hot-melt powder, and the hot-melt powder is melted and then solidified in a state containing surrounding inorganic particles when cooled. Therefore, the falling-off of the inorganic particles of the heat insulator can be further suppressed.
As the hot-melt powder, there may be mentioned hot-melt powders having various melting points, and a hot-melt powder having an appropriate melting point may be selected in consideration of the melting points of the core portion and the sheath portion of the binder fiber to be used. In the case of using the binder fiber having the core-sheath structure as the organic fiber, if the third organic material as a component constituting the hot-melt powder has a lower melting point than the first organic material constituting the organic fiber, the heating temperature for melting the sheath portion and the hot-melt powder while leaving the core portion can be set. For example, if the melting point of the hot-melt powder is equal to or lower than the melting point of the sheath portion, the heating temperature at the time of production is set between the melting point of the core portion and the melting point of the sheath portion, so that the heating temperature can be set more easily.
On the other hand, the type of the hot-melt powder to be used may be selected so that the melting point of the hot-melt powder is between the melting point of the core portion and the melting point of the sheath portion. When a hot-melt powder having such a melting point is used, the organic fibers (core) and the hot-melt powder existing in the gaps between the molten sheath and the inorganic particles around the organic fibers (core) solidify first when the sheath and the hot-melt powder are melted and cooled to solidify. As a result, the position of the organic fiber can be fixed, and then the melted sheath portion is welded to the organic fiber, so that a three-dimensional skeleton is easily formed. Therefore, the strength of the entire sheet can be further improved.
If the melting point of the third organic material constituting the hot-melt powder is sufficiently lower than the melting point of the first organic material constituting the core portion, the setting margin of the heating temperature in the heating step can be enlarged, and the temperature setting for obtaining a desired structure can be more easily performed. For example, the melting point of the first organic material is preferably 60 ℃ or higher, more preferably 70 ℃ or higher, and still more preferably 80 ℃ or higher than the melting point of the third organic material.
The melting point of the hot-melt powder (third organic material) is preferably 80 ℃ or higher, more preferably 90 ℃ or higher. The melting point of the hot-melt powder (third organic material) is preferably 180 ℃ or lower, more preferably 150 ℃ or lower. Examples of the component constituting the hot melt powder include polyethylene, polyester, polyamide, ethylene vinyl acetate, and the like.
(Content of Hot melt powder)
When the hot melt powder is contained in the material of the heat insulator in order to suppress the falling of the inorganic particles, the effect of suppressing the falling of the powder can be obtained even if the content thereof is small. Therefore, the content of the hot melt powder is preferably 0.5 mass% or more, more preferably 1 mass% or more, relative to the total mass of the material of the heat insulator.
On the other hand, if the content of the hot-melt powder is increased, the content of the inorganic particles and the like is relatively reduced, so that the content of the hot-melt powder is preferably 5 mass% or less, more preferably 4 mass% or less, relative to the total mass of the material of the heat insulator in order to obtain a desired heat insulating performance.
In the case of a material containing a hot-melt powder as a heat insulator, the heating temperature in the heating step is preferably set to be 10 ℃ or higher, more preferably 20 ℃ or higher, than the higher one of the melting point of the second organic material constituting the sheath portion and the melting point of the third organic material constituting the hot-melt powder. On the other hand, the heating temperature is preferably set to 10 ℃ or higher, more preferably 20 ℃ or higher, lower than the melting point of the first organic material constituting the core. By setting the heating temperature as described above, a strong skeleton can be formed, the strength of the sheet can be further improved, and the inorganic particles can be prevented from falling off.
The heat insulator may contain other binding materials, colorants, and the like as needed. These are useful for the purpose of reinforcing the heat insulator, improving the moldability, and the like, and the total amount is preferably 10 mass% or less relative to the total mass of the heat insulator.
Next, a method for manufacturing the heat transfer control sheet according to the present embodiment will be described.
[ 2] Method for producing Heat transfer suppressing sheet ]
The heat transfer control sheet 10 according to the first embodiment can be manufactured by, for example, the following method.
First, the heat insulator 11 containing inorganic particles is placed on a planar film having first holes 14, and then the film is folded, and the upper surface of the heat insulator 11 is covered with the film. Next, the film on the lower surface of the heat insulator 11 and the film on the upper surface are bonded by heating while pressing around the heat insulator 11. The bonded portion in this step is the welded portion 16 shown in fig. 1A and 1B. Then, the film around the heat insulator 11 is shrunk by heating, thereby forming a resin film 12 that is in close contact with the main surface 11a and the end surfaces 11b and 11c of the heat insulator 11. The first holes 14 may be formed at any timing before the film is shrunk, and a plurality of holes for discharging the air contained therein to the outside may be formed in any region in the film.
Thereafter, the cover 13 is laminated on the main surface side 12a of the resin film 12, and the resin film 12 and the cover 13 are bonded together with an adhesive or the like. When an adhesive tape is used as the cover 13, the cover 13 may be attached only to the main surface side 12a of the resin film 12. Thus, the heat transfer suppressing sheet 10 can be obtained.
The heat transfer control sheet 40 according to the second embodiment can be manufactured by, for example, the following method.
First, as in the first embodiment, the resin film 12 is formed by shrink-wrapping so as to be in close contact with the main surface 11a and the end surfaces 11b and 11c of the heat insulator 11. Next, using the film for covering material having the second hole 15, the heat insulator 11 and the resin film 12 are wrapped inside by shrink wrapping, and the cover 23 is formed in close contact with the surface of the resin film 12, similarly to the method of forming the resin film 12. At this time, at least a part of the second holes 15 is placed at a position offset from the first holes 14 when viewed in the lamination direction of the resin film 12 and the cover 23. Thereby, the heat transfer suppressing sheet 40 can be obtained.
Further, after the heat insulator 11 and the elastic sheet, not shown, are laminated to form a laminate, the heat transfer suppressing sheet of the third embodiment may be obtained in the same manner as in the first or second embodiment.
[ 3. Battery pack ]
The battery pack according to the embodiment of the present invention includes the heat transfer suppressing sheet described in "1. Heat transfer suppressing sheet" above. That is, as shown in fig. 2, the battery pack 100 includes a plurality of battery cells 20a, 20b, 20c and the heat transfer suppressing sheet 10 described above, for example, and the battery cells 20a, 20b, 20c are connected in series or in parallel. The heat transfer suppressing sheet 10 is interposed between the battery cells 20a and 20b and between the battery cells 20b and 20 c. The battery cells 20a, 20b, 20c and the heat transfer inhibiting sheet 10 are housed in the battery case 30.
In the assembled battery 100 having such a configuration, the heat transfer suppressing sheet 10 incorporating the heat insulator 11 is disposed between the battery cells, so that heat transfer from the battery cells having thermal runaway to the adjacent battery cells can be suppressed. In addition, even when the temperature inside the battery case 30 changes and a high humidity atmosphere is formed, the penetration of moisture outside the heat transfer suppressing sheet 10 into the heat insulator 11 enclosed in the resin film 12 can be suppressed. Therefore, the heat insulating property of the heat insulator 11 can be suppressed from being lowered.
When the inner region enclosed in the resin film 12 communicates with at least a part of the outer region of the heat transfer control sheet 10, the gas in the inner region can be discharged to the outside when the heat transfer control sheet 10 is heated to a high temperature due to the temperature rise of the battery cells 20a, 20b, and 20 c.
Although not shown, the heat transfer suppressing sheet described in "1. Heat transfer suppressing sheet" may be disposed not only between a plurality of battery cells but also between a battery cell and a battery case, for example. In this way, even when the heat transfer suppressing sheet is disposed between the battery cell and the battery case, the effect of suppressing heat transfer to the outside of the battery case can be maintained for a long period of time.
For example, therefore, when the battery pack 100 to which the heat transfer suppressing sheets 10 and 40 are applied is used in an Electric Vehicle (EV) or the like and is disposed under the floor of a passenger, the safety of the passenger can be ensured even if the battery cells fire.
In this case, if the heat transfer suppressing sheets 10, 40 and the like are disposed between the battery cells and the battery case, it is not necessary to newly manufacture a fireproof material or the like, and a safe battery pack can be configured at low cost.
While various embodiments have been described above, the present invention is not limited to such examples. It is apparent to those skilled in the art that various modifications or corrections can be made within the scope described in the application document, and it should be understood that they naturally fall within the technical scope of the present invention. The components in the above embodiments may be arbitrarily combined within a range not departing from the gist of the invention.
The present application is based on japanese patent application (japanese patent application No. 2022-212230) filed on 12/28 of 2022, the content of which is incorporated by reference.
Claims (11)
1. A heat transfer suppressing sheet, characterized in that,
The heat transfer inhibiting sheet has:
a thermal insulation comprising inorganic particles;
a resin film that encloses the heat insulator and has a plurality of first holes; and
And a cover member laminated on the resin film and covering at least a part of the plurality of first holes.
2. The heat transfer inhibiting sheet according to claim 1, wherein,
The inner region enclosed by the resin film communicates at least partially with the outer region of the heat transfer inhibiting sheet.
3. The heat transfer inhibiting sheet according to claim 1, wherein,
The resin film contains at least one resin selected from the group consisting of polyethylene, polypropylene, polystyrene, polyethylene terephthalate, and vinyl chloride.
4. The heat transfer inhibiting sheet according to claim 1, wherein,
The cover includes at least one resin selected from the group consisting of polyethylene, polypropylene, polystyrene, polyethylene terephthalate, and vinyl chloride.
5. The heat transfer inhibiting sheet according to claim 1, wherein,
The resin film has: a main surface side portion located on a main surface side of the heat insulator perpendicular to a thickness direction; and an end face side portion covering an end face side of the heat insulator, the end face side being substantially parallel to a thickness direction,
The first hole is formed at least on the side of the main surface,
The cover is laminated on at least a part of the main surface side portion.
6. The heat transfer inhibiting sheet according to claim 5, wherein,
The cover member is adhered to the resin film.
7. The heat transfer inhibiting sheet according to claim 1, wherein,
The cover has a plurality of second holes, and encloses the heat insulator and the resin film inside,
At least a part of the plurality of second holes is arranged at a position offset from the plurality of first holes when viewed in the lamination direction of the resin film and the cover.
8. The heat transfer inhibiting sheet according to claim 1, wherein,
The heat transfer inhibiting sheet further has an elastic sheet laminated to the heat insulating member,
A laminate formed by laminating the heat insulating material and the elastic sheet is enclosed in the resin film.
9. The heat transfer inhibiting sheet according to claim 1, wherein,
The thermal conductivity of the heat insulating member is less than 1W/mK.
10. The heat transfer inhibiting sheet according to claim 1, wherein,
The heat insulating member further comprises at least one selected from the group consisting of inorganic fibers, organic fibers, and organic particles.
11. A battery pack, characterized in that,
The battery pack has a plurality of battery cells connected in series or in parallel and the heat transfer suppressing sheet according to any one of claims 1 to 10.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022-212230 | 2022-12-28 | ||
| JP2022212230A JP7477591B1 (en) | 2022-12-28 | 2022-12-28 | Heat transfer suppression sheet and battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118263585A true CN118263585A (en) | 2024-06-28 |
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ID=90827147
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311813843.9A Pending CN118263585A (en) | 2022-12-28 | 2023-12-26 | Heat transfer suppressing sheet and battery pack |
| CN202323568923.0U Active CN221783316U (en) | 2022-12-28 | 2023-12-26 | Heat transfer suppressing sheet and battery pack |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323568923.0U Active CN221783316U (en) | 2022-12-28 | 2023-12-26 | Heat transfer suppressing sheet and battery pack |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7477591B1 (en) |
| CN (2) | CN118263585A (en) |
| WO (1) | WO2024143394A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006118636A (en) | 2004-10-22 | 2006-05-11 | Matsushita Electric Ind Co Ltd | Vacuum heat insulating material and refrigerator using the same |
| JP2016114215A (en) | 2014-12-17 | 2016-06-23 | 旭ファイバーグラス株式会社 | Vacuum heat insulation material |
| JP7422739B2 (en) | 2019-03-27 | 2024-01-26 | 三洋電機株式会社 | Power supplies and electric vehicles |
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2022
- 2022-12-28 JP JP2022212230A patent/JP7477591B1/en active Active
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2023
- 2023-12-26 CN CN202311813843.9A patent/CN118263585A/en active Pending
- 2023-12-26 WO PCT/JP2023/046722 patent/WO2024143394A1/en unknown
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| Publication number | Publication date |
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| JP7477591B1 (en) | 2024-05-01 |
| CN221783316U (en) | 2024-09-27 |
| JP2024095154A (en) | 2024-07-10 |
| WO2024143394A1 (en) | 2024-07-04 |
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