WO2011027491A1 - 二次電池及び携帯電子機器 - Google Patents
二次電池及び携帯電子機器 Download PDFInfo
- Publication number
- WO2011027491A1 WO2011027491A1 PCT/JP2010/003165 JP2010003165W WO2011027491A1 WO 2011027491 A1 WO2011027491 A1 WO 2011027491A1 JP 2010003165 W JP2010003165 W JP 2010003165W WO 2011027491 A1 WO2011027491 A1 WO 2011027491A1
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- WO
- WIPO (PCT)
- Prior art keywords
- composite sheet
- secondary battery
- laminated composite
- electronic device
- portable electronic
- Prior art date
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- UZKWTJUDCOPSNM-UHFFFAOYSA-N methoxybenzene Substances CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 1
- 229940017219 methyl propionate Drugs 0.000 description 1
- PYLWMHQQBFSUBP-UHFFFAOYSA-N monofluorobenzene Chemical compound FC1=CC=CC=C1 PYLWMHQQBFSUBP-UHFFFAOYSA-N 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- LYGJENNIWJXYER-UHFFFAOYSA-N nitromethane Chemical compound C[N+]([O-])=O LYGJENNIWJXYER-UHFFFAOYSA-N 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000010450 olivine Substances 0.000 description 1
- 229910052609 olivine Inorganic materials 0.000 description 1
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000004023 plastic welding Methods 0.000 description 1
- 229920002627 poly(phosphazenes) Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000005518 polymer electrolyte Substances 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- FVSKHRXBFJPNKK-UHFFFAOYSA-N propionitrile Chemical compound CCC#N FVSKHRXBFJPNKK-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 150000008053 sultones Chemical class 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000006234 thermal black Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- 239000011701 zinc Substances 0.000 description 1
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- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
- H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M50/133—Thickness
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M50/136—Flexibility or foldability
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
- H01M50/145—Primary casings; Jackets or wrappings for protecting against damage caused by external factors for protecting against corrosion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a secondary battery and a portable electronic device, and more particularly to a secondary battery including a power generation element and an exterior material that seals the power generation element, and a portable electronic device using the secondary battery as a power source.
- lithium secondary batteries are lightweight and have high energy density, and thus have been put into practical use as main power sources for portable electronic devices, and technological development for further increase in energy density has been actively conducted.
- a power generation element in which a positive electrode and a negative electrode are filled, wound, or laminated is contained in a container through a separator that electrically insulates an electrode plate and holds an electrolyte solution. Is sealed.
- the measures for increasing the energy density of the secondary battery can be broadly divided into two methods: using a material having a large capacity per volume as the electrode active material, or reducing the volume of parts that do not contribute to the battery reaction.
- Patent Document 1 As a technique for reducing the volume of components that do not contribute to the battery reaction, a technique using a laminate film in which a metal sheet and a resin film are bonded to a battery container (for example, Patent Document 1) has been proposed and put into practical use. . Compared to a case made of a metal plate used as a conventional container, a container using a laminate film can greatly reduce the volume.
- Patent Document 2 a technique for solving this problem, a technique (for example, Patent Document 2) is proposed in which a “shaped habit” for storing a power generation element by embossing is applied to a laminate film.
- Patent Document 3 proposes a technique using a high strength metal such as stainless steel as a metal used for the laminated film.
- Patent Document 4 proposes a technique in which the thickness of the metal layer of the two laminated films to be bonded is changed, the laminated film having a thick metal layer has a concave shape, and the power generation element is disposed inside the concave shape. ing.
- an object of the present invention is to provide a secondary battery that uses a laminate film for a battery container and achieves both high energy density and high strength of the battery itself.
- a secondary battery of the present invention includes a power generation element and an exterior material that seals the power generation element, and the exterior material includes a first metal layer and a first metal layer made of stainless steel.
- a recess which is a storage portion for storing the power generation element is formed, and the first plastic layer of the first laminated composite sheet and the second plastic layer of the second laminated composite sheet are heated. It was set as the structure by which the said electric power generation element was sealed by welding.
- the storage part is preferably formed by drawing.
- the first laminated composite sheet has a third plastic layer that covers the first metal layer
- the second laminated composite sheet has a fourth plastic layer that covers the second metal layer.
- it is.
- a first portable electronic device of the present invention is equipped with the above-described secondary battery, and the secondary battery is disposed so that a surface covered with the second laminated composite sheet faces a substrate of the portable electronic device. It was set as the structure.
- a second portable electronic device includes the above-described secondary battery, and a surface of the secondary battery covered with the first laminated composite sheet is exposed or covered with a cover. It was set as the structure.
- two types of laminated composite sheets having different strengths are used to form the recesses in the second laminated composite sheet having low strength to seal the power generation element.
- the volume of the exterior packaging material can be reduced, and the energy density can be increased.
- the metal mainly composed of aluminum includes an alloy containing 95% or more of aluminum and a composite metal in which another metal having a thickness of 1/10 or less of aluminum is laminated on the surface of aluminum.
- substrate of a portable electronic device is a circuit board with which the electronic component which is a component of a portable electronic device is mounted.
- FIG. 1 is a schematic cross-sectional view of the lithium secondary battery according to the first embodiment.
- the lithium secondary battery in this embodiment includes a power generation element 1 configured by winding or stacking a negative electrode facing a positive electrode with a porous separator interposed therebetween. It comprises.
- the power generation element 1 and an electrolyte (not shown) having lithium ion conductivity are accommodated in a container made of an exterior material made of a laminated composite sheet.
- the exterior material includes a first laminated composite sheet 2 having a first metal layer and a first plastic layer, and a second metal layer and a second plastic layer having a strength lower than that of the first metal layer.
- the second laminated composite sheet 3 is further formed with a recess, which is a housing portion for housing the power generating element 1, by pressing or drawing.
- the first laminated composite sheet 2 and the second laminated composite sheet 3 are bonded by plastic welding of plastic layers.
- FIG. 2 is a cross-sectional view of the laminated composite sheet in the present embodiment. Since the first laminated composite sheet 2 and the second laminated composite sheet 3 have the same structure, they will be described together.
- the laminated composite sheet includes a metal layer 4a serving as a base material and a plastic layer as an adhesive layer 4b (a first plastic layer of the first laminated composite sheet and a second plastic layer of the second laminated composite sheet). And a protective layer 4c (corresponding to the third plastic layer of the first laminated composite sheet and the fourth plastic layer of the second laminated composite sheet).
- An adhesive layer 4b and a protective layer 4c are laminated on both surfaces of the metal layer 4a.
- the minimum configuration of the laminated composite sheet is a two-layer configuration of the metal layer 4a and the adhesive layer 4b, and the protective layer 4c may not be provided.
- the metal layer 4a is a component that ensures the mechanical strength of the laminated composite sheet. Although the first metal layer and the second metal layer have different strengths, the strength of the metal layer 4a can be changed by changing the material, changing the layer thickness, applying heat treatment, or the like.
- the strength here is represented by the value of the product YT of the Young's modulus Y and the thickness T of the metal layer.
- the product YT is 5 (kgf / mm) or more and 20 (kgf / mm) or less. Preferably there is. On the other hand, it is preferable that YT is 2 (kgf / mm) or more and 4 (kgf / mm) or less as a metal layer with low strength.
- the material of the low-strength metal layer aluminum, aluminum alloy, magnesium alloy, titanium or the like is preferable, and as the material of the high-strength metal layer, stainless steel (austenite, martensite, ferrite) steel, nickel, iron or the like is preferable. .
- the adhesive layer 4b is for heat-sealing the laminated composite sheets
- the protective layer 4c is for improving flexibility and insulation or corrosion resistance of the metal layer 4a.
- the metal layer 4a and the adhesive layer 4b, and the metal layer 4a and the protective layer 4c are integrated by heat welding or adhesion using an adhesive.
- the adhesion between the laminated composite sheets is performed by laminating the adhesive layers 4b of the two laminated composite sheets and performing press welding while applying heat.
- the resin used for the adhesive layer 4b polypropylene, polyethylene and the like are preferable.
- a resin having a melting point higher than that of the resin of the adhesive layer 4b is preferable so as not to melt at the time of adhesion between the laminated composite sheets.
- nylon 6, nylon 610, nylon 66, polyamide, polyimide and the like are preferable.
- the thickness of the adhesive layer 4b is preferably about 20 ⁇ m to 100 ⁇ m. If it is less than 20 ⁇ m, the adhesive force between the laminated composite sheets becomes insufficient, the sealing ability becomes insufficient, and problems such as leakage of the electrolytic solution and intrusion of moisture into the power generation element 1 occur. On the other hand, when the thickness exceeds 100 ⁇ m, the exterior material becomes thick, and the energy density of the battery becomes low.
- the strength of the battery is maintained by the first laminated composite sheet 2, and the volume of the battery can be kept small by forming the second laminated composite sheet 3 with good workability by drawing. It is possible to improve both the energy density and the impact resistance of the battery.
- the strength is increased by increasing the thickness of the metal layer, the thickness of the battery increases, which is not preferable from the viewpoint of improving the energy density.
- the second metal layer of the second laminated composite sheet 3 is preferably made of a metal mainly composed of aluminum.
- Aluminum is highly flexible and easy to stretch. Therefore, it is easy to form the storage portion by processing, and it is possible to store a battery having a large volume. Moreover, since aluminum has a small density and light weight, the energy density per weight of the battery can be increased.
- the first metal layer of the first laminated composite sheet 2 is preferably made of stainless steel.
- Stainless steel has high rigidity and high strength even when the thickness is small. Therefore, even if an impact or drop occurs on the battery, the internal power generation element can be prevented from being damaged, and high safety can be ensured.
- This embodiment exhibits a particularly great effect when applied to a lithium secondary battery having high output and high energy density.
- the second laminated composite sheet forms a power generation element storage portion by performing pressing (particularly drawing), and can be processed in a short time.
- a high-strength processed product is obtained with little damage caused by heat.
- Drawing processing can stably perform processing of the same shape as compared to other press processing such as overhang processing.
- the positive electrode, the negative electrode, the separator, and the electrolyte are not limited to the materials and configurations described below.
- the positive electrode includes a positive electrode current collector and a positive electrode active material layer.
- the positive electrode active material layer includes a positive electrode active material as an essential component, and includes a conductive material, a binder, and the like as optional components.
- the positive electrode active material is an olivine type lithium phosphate represented by a general formula: LiMPO 4 (M is at least one selected from the group consisting of V, Fe, Ni and Mn), and a general formula: Li 2 MPO.
- lithium fluorophosphate represented by 4 F (M is at least one selected from the group consisting of V, Fe, Ni and Mn).
- conductive materials natural graphite and artificial graphite graphite, acetylene black, ketjen black, channel black, furnace black, lamp black, thermal black and other carbon blacks, conductive fibers such as carbon fibers and metal fibers, Metal powders such as carbon fluoride and aluminum, conductive whiskers such as zinc oxide and potassium titanate, conductive metal oxides such as titanium oxide, and organic conductive materials such as phenylene derivatives can be used. Only one type of conductive material may be used alone, or two or more types may be used in combination.
- binder examples include polyvinylidene fluoride (PVDF), polytetrafluoroethylene, polyethylene, polypropylene, aramid resin, polyamide, polyimide, polyamideimide, polyacrylonitrile, polyacrylic acid, polyacrylic acid methyl ester, and polyacrylic acid.
- PVDF polyvinylidene fluoride
- aramid resin polyamide, polyimide, polyamideimide, polyacrylonitrile, polyacrylic acid, polyacrylic acid methyl ester, and polyacrylic acid.
- Ethyl ester polyacrylic acid hexyl ester, polymethacrylic acid, polymethacrylic acid methyl ester, polymethacrylic acid ethyl ester, polymethacrylic acid hexyl ester, polyvinyl acetate, polyvinyl pyrrolidone, polyether, polyether sulfone, hexafluoropolypropylene, Styrene butadiene rubber, carboxymethyl cellulose and the like can be used.
- a copolymer containing the material may be used.
- a binder may be used individually by 1 type and may be used in combination of 2 or more type.
- the positive electrode current collector is not particularly limited, and examples thereof include aluminum (Al), carbon, and conductive resin.
- the positive electrode current collector may be surface-treated with carbon or the like.
- the negative electrode includes a negative electrode current collector and a negative electrode active material layer.
- the negative electrode active material layer includes a negative electrode active material as an essential component and a binder or the like as an optional component.
- the negative electrode active material include carbon materials (for example, various natural graphites and artificial graphite), substances containing Si (Si simple substance, Si alloy, SiO x (0 ⁇ x ⁇ 2), etc.), substances containing Sn (Sn simple substance, Sn alloy, SnO, etc.), lithium metal, etc. can be used.
- Lithium metal includes lithium alloys containing Al, Zn, Mg and the like in addition to lithium alone.
- a negative electrode active material may be used individually by 1 type, and may be used in combination of 2 or more type.
- the binder for the negative electrode is not particularly limited.
- the same binder as that exemplified as the positive electrode binder can be used.
- the current collector for the negative electrode is not particularly limited, and examples thereof include metal foils such as stainless steel, nickel, copper, and titanium, and carbon and conductive resin thin films.
- the negative electrode current collector may be surface-treated with carbon, nickel, titanium, or the like.
- non-aqueous electrolyte examples include a liquid non-aqueous electrolyte containing a non-aqueous solvent and a solute dissolved in the non-aqueous solvent, and a polymer electrolyte containing a liquid non-aqueous electrolyte and a polymer compound.
- the solute is not particularly limited, and may be appropriately selected in consideration of, for example, a redox potential.
- Preferred solutes include, for example, LiPF 6 , LiBF 4 , LiClO 4 , LiAlCl 4 , LiSbF 6 , LiSCN, LiCF 3 SO 3 , LiNCF 3 CO 2 , LiAsF 6 , LiB 10 Cl 10 , lower aliphatic lithium carboxylate, LiF , LiCl, LiBr, LiI, chloroborane lithium, bis (1,2-benzenediolate (2-)-O, O ') lithium borate, bis (2,3-naphthalenedioleate (2-)-O, O ′) lithium borate, bis (2,2′-biphenyldiolate (2-)-O, O ′) lithium borate, bis (5-fluoro-2-olate-1-benzenesulfonic acid-O, O ') Borates such as lithium borate, LiN (CF
- the non-aqueous solvent is not particularly limited.
- the non-aqueous electrolyte may contain an additive.
- the additive is not particularly limited.
- An additive may be used individually by 1 type and may be used in combination of 2 or more type.
- the non-aqueous electrolyte may be a solid electrolyte containing a polymer material, or may be a gel electrolyte containing a non-aqueous solvent.
- the polymer material include polyethylene oxide, polypropylene oxide, polyphosphazene, polyaziridine, polyethylene sulfide, polyvinyl alcohol, polyvinylidene fluoride, and polyhexafluoropropylene.
- a gel-like non-aqueous electrolyte When using a gel-like non-aqueous electrolyte, a gel-like non-aqueous electrolyte may be disposed between the positive electrode and the negative electrode instead of the separator. Alternatively, the gel-like nonaqueous electrolyte may be disposed adjacent to the separator 3.
- An inorganic material such as 2 S—SiS 2 or a phosphorus sulfide compound may be used as the solid electrolyte.
- the separator examples include a nonwoven fabric containing at least one selected from the group consisting of polyethylene, polypropylene, aramid resin, amideimide, polyphenylene sulfide, and polyimide, and a microporous film.
- the separator is impregnated with a liquid non-aqueous electrolyte.
- the inside or surface of the separator may contain a heat-resistant filler such as alumina, magnesia, silica, titania.
- a heat-resistant layer containing the above heat-resistant filler and a binder similar to the binder for the positive electrode and the negative electrode may be formed.
- the heat-resistant layer may be formed on any surface of the positive electrode, the negative electrode, and the separator.
- This embodiment is most effective when applied to a lithium secondary battery having high output and high energy density.
- the secondary battery to which this embodiment can be applied is limited to a lithium ion secondary battery. Absent.
- the same effect can be obtained when applied to an alkaline secondary battery or a lead storage battery.
- FIG. 3 is a cross-sectional view of a portable electronic device using the secondary battery in the present embodiment as a power source.
- the surface of the secondary battery made of the second laminated composite sheet having a lower strength is more portable than the surface made of the first laminated composite sheet.
- the degree of protection against external impact by the component members of the device is large. Specifically, it is protected by being arranged in the portable electronic device so that the surface made of the second laminated composite sheet having a lower strength faces the substrate.
- a general portable electronic device using a secondary battery as a power source includes an operation unit 5, an electronic circuit (including a substrate) 7, a display unit 9, and the like in a device housing 6, and the secondary battery 10 is usually an electronic device. It is housed in the vicinity of the outer shell and is covered with a battery cover 8. Along with the reduction in thickness of portable electronic devices, a thin battery cover 8 is selected, and some of them also serve as a battery exterior material. Accordingly, when an impact is applied to the portable electronic device, a considerable impact is also applied to the secondary battery 10. However, as shown in FIG.
- the surface made of the first laminated composite sheet 2 having high strength faces the outside of the portable electronic device, and the surface made of the second laminated composite sheet 3
- the secondary battery 10 so as to be directed to the inside of the portable electronic device and protected by the substrate of the electronic circuit 7, the impact received from the outside of the portable electronic device is transmitted to the strong first laminated composite sheet 2. Therefore, the influence on the power generation element 1 can be suppressed small.
- the configuration of the portable electronic device of the secondary battery having a lower strength than the surface of the first laminated composite sheet is less than that of the second laminated composite sheet.
- the surface made of the first laminated composite sheet having high strength is exposed or only in the case of the portable electronic device.
- the surface made of the second laminated composite sheet is protected by both the case and the parts in the device, or the surface made of the first laminated composite sheet and the mobile phone facing the surface.
- the secondary battery is arranged and protected so that the distance from the case of the electronic device is smaller than the distance between the surface made of the second laminated composite sheet and the case of the portable electronic device facing the surface. It may be.
- the secondary battery according to the present invention has a large energy density and a high strength.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
Description
図1は、第1の実施形態に係るリチウム二次電池の模式的な断面図である。なお図1では見やすいように断面の詳細な構成を省略している。本実施形態におけるリチウム二次電池(以下、「電池」と記す場合がある)は、正極と対向する負極とを、多孔質のセパレータを介して、捲回または積層して構成される発電要素1を具備する。発電要素1とリチウムイオン伝導性を有する電解質(図示せず)は、積層複合シートからなる外装材からなる容器の内部に収容されている。外装材は第1の金属層と第1のプラスチック層とを有する第1の積層複合シート2と、第1の金属層よりも強度の小さな第2の金属層と第2のプラスチック層とを有する第2の積層複合シート3とで構成されており、さらに第2の積層複合シート3には発電要素1を収納する収納部である凹みがプレス、または絞り加工によって形成されている。第1の積層複合シート2と第2の積層複合シート3とは、プラスチック層同士が熱溶着されて接合されている。
図3は本実施形態における二次電池を電源に用いる携帯電子機器の断面図である。
上記の実施形態は本発明の例示であり、本発明はこの例に限定されない。
2 第1の積層複合シート
3 第2の積層複合シート
4a 金属層
4b 接着層
4c 保護層
5 操作部
6 筐体
7 電子回路
8 電池カバー
9 表示部
10 二次電池
Claims (5)
- 発電要素と、該発電要素を封止する外装材とを備えた二次電池であって、
前記外装材は、ステンレス鋼からなる第1の金属層及び第1のプラスチック層を有する第1の積層複合シートと、アルミニウムを主体とする第2の金属層及び第2のプラスチック層を有する第2の積層複合シートとを備え、
前記第2の積層複合シートは、前記発電要素を収納する収納部である凹みが形成されており、
前記第1の積層複合シートの前記第1のプラスチック層と、前記第2の積層複合シートの前記第2のプラスチック層とが熱溶着されて前記発電要素が封止されている、二次電池。 - 前記収納部は絞り加工により形成されている、請求項1に記載されている二次電池。
- 前記第1の積層複合シートは前記第1の金属層を覆う第3のプラスチック層を有し、
前記第2の積層複合シートは前記第2の金属層を覆う第4のプラスチック層を有している、請求項1または2に記載されている二次電池。 - 請求項1から3のいずれか一つに記載されている二次電池を搭載した携帯電子機器であって、
前記二次電池は、前記第2の積層複合シートに覆われた面が前記携帯電子機器の基板と向かい合って配置されている、携帯電子機器。 - 請求項1から3のいずれか一つに記載されている二次電池を搭載した携帯電子機器であって、
前記二次電池のうち、前記第1の積層複合シートに覆われた面は露出している、あるいはカバーに覆われている、携帯電子機器。
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US13/393,781 US20120155001A1 (en) | 2009-09-02 | 2010-05-10 | Secondary battery and portable electronic device |
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JP2009202644A JP2012226826A (ja) | 2009-09-02 | 2009-09-02 | 二次電池及び携帯電子機器 |
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JP (1) | JP2012226826A (ja) |
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CN109873092A (zh) * | 2019-02-26 | 2019-06-11 | 宁德新能源科技有限公司 | 电池单元及电子设备 |
WO2022077867A1 (zh) * | 2020-10-18 | 2022-04-21 | 深圳市聚和源科技有限公司 | 软包电池及其制作方法 |
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JP5772412B2 (ja) * | 2011-09-07 | 2015-09-02 | 凸版印刷株式会社 | リチウムイオン電池外装材、リチウムイオン電池 |
US9341740B1 (en) | 2012-02-13 | 2016-05-17 | See Scan, Inc. | Optical ground tracking apparatus, systems, and methods |
WO2015001803A1 (ja) * | 2013-07-05 | 2015-01-08 | パナソニック株式会社 | 電気化学エネルギー蓄積デバイス |
KR102073192B1 (ko) | 2013-08-07 | 2020-02-04 | 삼성에스디아이 주식회사 | 파우치형 배터리셀 |
KR102082871B1 (ko) | 2013-09-11 | 2020-02-28 | 삼성에스디아이 주식회사 | 전자기기용 배터리 셀 |
EP2899769B1 (en) * | 2013-11-27 | 2019-01-30 | LG Chem, Ltd. | Pouch for secondary battery and secondary battery comprising same |
JP6331482B2 (ja) * | 2014-03-03 | 2018-05-30 | 大日本印刷株式会社 | 電池用包装材料 |
EP2933759A1 (fr) * | 2014-04-18 | 2015-10-21 | Gemalto SA | Procédé de fabrication d'un dispositif à circuit électronique/électrique |
JP6753096B2 (ja) * | 2015-08-04 | 2020-09-09 | 株式会社村田製作所 | 二次電池 |
CN107706326B (zh) * | 2017-08-17 | 2021-03-09 | 深圳天珑无线科技有限公司 | 一种电池保护件及保护方法、电池组件 |
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JP2012226826A (ja) | 2012-11-15 |
KR20120053062A (ko) | 2012-05-24 |
US20120155001A1 (en) | 2012-06-21 |
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