JPWO2015146078A1 - 円筒形密閉電池及び電池パック - Google Patents
円筒形密閉電池及び電池パック Download PDFInfo
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- 238000007789 sealing Methods 0.000 claims abstract description 37
- 239000003792 electrolyte Substances 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- 229910000838 Al alloy Inorganic materials 0.000 claims description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 239000007774 positive electrode material Substances 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- RSNHXDVSISOZOB-UHFFFAOYSA-N lithium nickel Chemical compound [Li].[Ni] RSNHXDVSISOZOB-UHFFFAOYSA-N 0.000 claims 1
- 239000011255 nonaqueous electrolyte Substances 0.000 abstract description 56
- 239000007789 gas Substances 0.000 description 30
- 230000000052 comparative effect Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 230000002159 abnormal effect Effects 0.000 description 9
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- 238000003466 welding Methods 0.000 description 8
- -1 polyethylene Polymers 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 239000002033 PVDF binder Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 3
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 3
- 239000012768 molten material Substances 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 238000009783 overcharge test Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 229910013870 LiPF 6 Inorganic materials 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000007606 doctor blade method Methods 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 229910021469 graphitizable carbon Inorganic materials 0.000 description 2
- 229920006015 heat resistant resin Polymers 0.000 description 2
- 239000003779 heat-resistant material Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002905 metal composite material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- ZZXUZKXVROWEIF-UHFFFAOYSA-N 1,2-butylene carbonate Chemical compound CCC1COC(=O)O1 ZZXUZKXVROWEIF-UHFFFAOYSA-N 0.000 description 1
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- 229910013063 LiBF 4 Inorganic materials 0.000 description 1
- 229910013684 LiClO 4 Inorganic materials 0.000 description 1
- 229910002995 LiNi0.8Co0.15Al0.05O2 Inorganic materials 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 150000005678 chain carbonates Chemical class 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 150000005676 cyclic carbonates Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229910021470 non-graphitizable carbon Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000011076 safety test Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
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- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
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- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
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- 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
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- Gas Exhaust Devices For Batteries (AREA)
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Abstract
Description
有底円筒状の外装缶と、封口体と、正極板及び負極板がセパレータを介して巻回された円筒状巻回電極体と、電解質と、を有し、
前記外装缶の内部に前記円筒状巻回電極体と前記電解質とが配置され、前記外装缶の開口部が絶縁ガスケットを介して前記封口体によりカシメ封口されており、
前記封口体は、薄肉部による易破断部を有する蓋体と、前記蓋体の内部側に配置された絶縁リングと、前記蓋体の内部側に配置された薄肉部による易破断部を有する端子板とからなり、
前記端子板は前記円筒状巻回電極体から導出された集電体と電気的に接続され、
前記蓋体及び前記端子板は前記絶縁リングの開口を経て互いに電気的に接続され、
少なくとも前記蓋体が前記絶縁リングの開口と対向している部分の外部側は、外部に直接露出している、
円筒形密閉電池が提供される。
上記一態様の円筒形密閉電池と前記円筒形密閉電池を保持するホルダを備え、
前記ホルダは、前記蓋体の外周部に対して突出する蓋体変形抑制部を有している、電池パックが提供される。
実施形態1の円筒形密閉電池としての非水電解質二次電池10を図1を用いて説明する。この非水電解質二次電池10は、正極板11と負極板12とがセパレータ13を介して渦巻き状に巻回された円筒状巻回電極体14を備えている。円筒状巻回電極体14は、それぞれ上部絶縁板16及び下部絶縁板17が配置されて、金属製の外装缶15の内部に配置されている。
リチウム・ニッケル・コバルト・アルミニウム複合酸化物(LiNi0.8Co0.15Al0.05O2)からなる正極活物質と、アセチレンブラックからなる導電剤と、ポリビニリデンフルオライド(PVdF)からなる結着剤とを、質量比100:2.5:1.7の割合で秤量し、これらをN−メチル−2−ピロリドンからなる有機溶剤と混合し、正極合剤ペーストを調製した。この正極合剤ペーストを、ドクターブレード法によりアルミニウム箔(厚み:15μm)からなる正極芯体の両面に均一な厚みで塗布した。
易黒鉛化炭素粒子からなる負極活物質と、ポリビニリデンフルオライド(PVdF)からなる結着剤と、カルボキシメチルセルロースからなる増粘剤とを、質量比100:0.6:1の割合で混合し、これらを適量の水と混合し、負極合剤ペーストを調製した。この負極合剤ペーストを、ドクターブレード法により銅箔(厚み:10μm)からなる負極芯体の両面に均一な厚みで塗布した。
上記のようにして作製された正極板11及び負極板12をポリエチレン製微多孔膜からなるセパレータ13によって互いに絶縁された状態で、巻き取り機により巻回し、絶縁性の巻き止めテープを設け、円筒状巻回電極体14を作製した。
エチレンカーボネート(EC)と、ジメチルカーボネート(DMC)と、エチルメチルカーボネート(EMC)とを、を体積比2:2:6の割合(1気圧、25℃と換算した場合における)で混合した非水溶媒に、電解質塩としてのLiPF6を1.0モル/リットルの割合で溶解したものを非水電解液とした。
基材としての鉄鋼板にニッケルメッキを施した。その後、絞り加工により、有底円筒状の外装缶15を作製した。ここで、外装缶15は、封口部の板厚を0.2mm、側壁の板厚を0.25mmとした。また、外装缶15の底面の板厚は、0.3mmとし、C字状の溝を設け、溝の厚みは、0.05mmとした。
蓋体22は、板厚1.0mmのアルミニウム合金をプレス加工することにより作製した。外径を17mmとし、中央に径が9mmの薄肉部からなる易破断部22aを設けるとともに、その中心側に薄肉の段差部22bを形成した。絶縁リング23は、厚み0.8mm、外径14mm、内径10mmのポリプロピレン製であり、射出成形によって作製した。端子板24は、厚み0.5mmのアルミニウム合金をプレス加工することにより作製し、外径を13mmとし、中央に薄肉の段差部24bを形成するとともに、段差部24bの中心側により薄肉の易破断部24aを形成した。蓋体22、絶縁リング23及び端子板24を互いに積層し、蓋体22の段差部22b及び端子板24の段差部24bを互いに面状に接触させるとともに、この面状に接触している箇所の中央部をスポットレーザ溶接することにより接合し、封口体20を作製した。
上記のようにして作製した円筒状巻回電極体14の上下にポリプロピレン製の上部絶縁板16及び下部絶縁板17を置き、円筒状巻回電極体14を外装缶15内に収容し、負極集電体19と外装缶15の缶底とを抵抗溶接した。この後、塑性加工により、外装缶15に幅1.0mm、深さ1.5mmの円周状の溝入れ部15aを形成し、上記のようにして調製した非水電解液を外装缶15内に注液した。
従来例に対応する比較例の円筒形密閉電池としての非水電解質二次電池30を図2に示した。この非水電解質二次電池30は、端子板31、防爆弁32及びキャップ34を有する従来構造の封口体33を備えること以外は、上記実施形態1の非水電解質二次電池10と同様の構成を備えている。そのため、比較例の非水電解質二次電池30においては、封口体33の構成について詳細に説明することとし、実施形態1の非水電解質二次電池10と同様の構成部分には同一の参照符号を付与してその詳細な説明は省略する。
上記実施形態1に係る非水電解質二次電池10及び比較例に係る非水電解質二次電池30をそれぞれ20個用意し、これらの電池を室温(25℃)雰囲気下、0.5It(1600mA)の定電流で電圧が4.2Vとなるまで充電した。この後、各電池の10個ずつについて、過充電試験及びホットプレート試験を行った。
過充電試験は、1.5It(4800mA)の定電流で充電を継続することにより行った。実施形態1の電池においては易破断部24aが破断することで充電が停止し、比較例の電池においては破砕溝31aが破断することで充電が停止した。結果は全ての電池において、電池の破裂や発火が生じることはなかった。
ホットプレート試験は、200℃に設定したホットプレート上に各電池を配置して加熱することにより行った。この時の封口体の状態又は封口体の外装缶からの離脱の有無及び外装缶側壁の亀裂の発生の有無を目視にて確認した。
実施形態2においては、実施形態1の円筒形密閉電池としての非水電解質二次電池10に対して、ホルダを取り付けて電池パック40としたものである。そこで、実施形態2においては、実施形体1の非水電解質二次電池10部分に対しては、説明に必要な箇所のみ実施形態1と同一の参照符号を付与して説明し、その他の点については詳細な説明は省略する。
13:セパレータ 14:円筒状巻回電極体 15:外装缶
15a:溝入れ部 16:上部絶縁板 17:下部絶縁板
18:正極集電体 19:負極集電体 20:封口体
21:絶縁ガスケット 22:蓋体 22a:易破断部
22b:段差部 23:絶縁リング 23a:開口部
24:端子板 24a:易破断部 24b:段差部
25:溶接スポット 26:センターピン
30:非水電解質二次電池 31:端子板 31a:破砕溝
31b、31d:開口 31c:端子プレート 32:防爆弁
32a:破砕溝 33:封口体 34:キャップ
34a:ガス抜き穴 35:絶縁板 36:溶接スポット
40:電池パック 41:上部ホルダ 41a:第1のリブ
41b:第2のリブ 42:下部ホルダ 42a:リブ
43:開孔 45:正極リード 46:負極リード
Claims (6)
- 有底円筒状の外装缶と、封口体と、正極板及び負極板がセパレータを介して巻回された円筒状巻回電極体と、電解質と、を有し、
前記外装缶の内部に前記円筒状巻回電極体と前記電解質とが配置され、前記外装缶の開口部が絶縁ガスケットを介して前記封口体によりカシメ封口されており、
前記封口体は、薄肉部による易破断部を有する蓋体と、前記蓋体の内部側に配置された絶縁リングと、前記蓋体の内部側に配置された薄肉部による易破断部を有する端子板とからなり、
前記端子板は前記円筒状巻回電極体から導出された集電体と電気的に接続され、
前記蓋体及び前記端子板は前記絶縁リングの開口を経て互いに電気的に接続され、
少なくとも前記蓋体が前記絶縁リングの開口と対向している部分の外部側は、外部に直接露出している、
円筒形密閉電池。 - 前記蓋体及び前記端子板の易破断部は、前記絶縁リングの開口と対向する位置に形成されている、請求項1に記載の円筒形密閉電池。
- 前記蓋体及び前記端子板は、前記絶縁リングの開口と対向する位置で互いに近接するように突出されており、前記絶縁リングの内部で互いに直接電気的に接続されている、請求項1又は2に記載の円筒形密閉電池。
- 前記蓋体はアルミニウム又はアルミニウム合金からなり、前記外装缶はステンレススチール又はニッケルメッキ鉄鋼板からなる、請求項1〜3のいずれかに記載の円筒形密閉電池。
- 前記正極板は、一般式LixNiyM1-yO2(0.95≦x≦1.10、MはCo、Mn、Cr、Fe、Mg、Ti及びAlの少なくとも1種類、0.6≦y≦0.95)で表されるリチウムニッケル複合酸化物からなる正極活物質を含み、
体積エネルギー密度が500Wh/L以上である、
請求項1〜4のいずれかに記載の円筒形密閉電池。 - 請求項1〜5のいずれかに記載の円筒形密閉電池と、前記円筒形密閉電池を保持するホルダを備え、
前記ホルダは、前記蓋体の前記の外周部に突出する蓋体変形抑制部を有する、電池パック。
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