WO2011086904A1 - リチウムイオン二次電池およびその製造方法 - Google Patents
リチウムイオン二次電池およびその製造方法 Download PDFInfo
- Publication number
- WO2011086904A1 WO2011086904A1 PCT/JP2011/000102 JP2011000102W WO2011086904A1 WO 2011086904 A1 WO2011086904 A1 WO 2011086904A1 JP 2011000102 W JP2011000102 W JP 2011000102W WO 2011086904 A1 WO2011086904 A1 WO 2011086904A1
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- WIPO (PCT)
- Prior art keywords
- electrode plate
- positive electrode
- plate group
- elastic member
- negative electrode
- Prior art date
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 title claims description 13
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Images
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
- H01M10/05—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
- 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
-
- 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
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
Definitions
- the present invention relates to a lithium ion secondary battery having a flat shape and a manufacturing method thereof.
- a so-called winding structure in which an electrode plate group formed by combining a positive electrode plate, a negative electrode plate and a separator is wound in a spiral shape is known.
- lithium ion secondary batteries using electrode plates wound in a flat shape are in great demand in the field of mobile devices and the like.
- the winding end portion of the electrode plate group is usually fixed with an adhesive (typically, an adhesive tape).
- the phenomenon that the electrode plate group expands with charging is known to those skilled in the field of lithium ion secondary batteries.
- the positive electrode plate expands in volume by dedoping lithium ions from the positive electrode active material
- the negative electrode plate expands in volume by doping lithium ions into the negative electrode active material.
- the winding end portion is fixed with the adhesive, expansion of the electrode plate group in the outward direction is limited. Therefore, a relatively large stress is generated in the electrode plate group, and the electrode plate group may be deformed so as to release this stress.
- the electrode group may be bent like a formation. Deformation of the electrode plate group is often accompanied by an increase in battery thickness.
- Japanese Patent Application Laid-Open No. 2006-302801 describes a technique for fixing the winding end portion using an adhesive body in which a crease portion is provided only on a base material where no adhesive is present. ing.
- the pressure-sensitive adhesive body described in this document the slack of the electrode plate group is allowed due to the extension of the crease portion, so that a space capable of absorbing the expansion of the electrode plate group is secured even after the electrode plate group is wound. Thereby, the increase in the thickness of the battery accompanying charging can be suppressed.
- an object of the present invention is to provide a further improvement technique for suppressing an increase in the thickness of a battery accompanying charging.
- a lithium ion secondary battery having a flat shape, An electrode plate group including a positive electrode plate, a negative electrode plate and a separator, and wound in a flat shape; An elastic member having porosity, which is incorporated in the corner portion of the electrode plate group in the winding direction inside the outermost peripheral portion of the electrode plate group;
- a lithium ion secondary battery comprising:
- the present invention provides: A method of manufacturing a lithium ion secondary battery having a flat shape, Preparing a positive electrode plate, a separator and a negative electrode plate; Forming the electrode plate group by combining the positive electrode plate, the separator and the negative electrode plate, and winding the electrode plate group; In a stage prior to the end of the winding step, so that an elastic member having porosity is incorporated in the corner portion of the electrode plate group in the winding direction inside the outermost peripheral part of the electrode plate group, Disposing the elastic member on the positive electrode plate, the negative electrode plate or the separator; Fixing the winding end of the electrode plate group; A method for producing a lithium ion secondary battery is provided.
- the porous elastic member is incorporated in the corner portion of the electrode plate group in the winding direction inside the outermost peripheral part (outermost part) of the electrode plate group.
- the porous elastic member receives a load from the electrode plate group and reduces its volume.
- the elastic member allows the electrode plate group to expand.
- expansion of the electrode plate group in the in-plane direction (direction perpendicular to the thickness direction) of the battery is allowed. As a result, an increase in the thickness of the battery accompanying charging can be effectively suppressed, and the initial thickness of the battery can be reduced.
- the “initial thickness of the battery” means the thickness of the battery in a state where it is initially charged after assembly.
- the perspective view of the lithium ion secondary battery concerning one Embodiment of this invention Partial sectional view of the electrode plate group used in the lithium ion secondary battery shown in FIG. Cross-sectional view of the outermost periphery of the electrode plate group The top view which shows the position which should arrange
- position an elastic member Sectional view of another electrode plate group incorporating an elastic member substantially in one circle
- the lithium ion secondary battery 10 of this embodiment includes a battery case 11 and an electrode plate group 30 accommodated in the battery case 11.
- the battery 10 has a flat and square shape.
- the electrode plate group 30 also has a flat and square shape.
- a positive electrode lead 33 and a negative electrode lead 34 are attached to the electrode plate group 30.
- the leads 33 and 34 are respectively taken out from the battery case 11.
- the electrode plate group 30 is formed by combining the positive electrode plate 14, the negative electrode plate 18 and the separator 15.
- the positive electrode plate 14 includes a positive electrode current collector 12 and a positive electrode active material layer 13 provided on both surfaces of the positive electrode current collector 12.
- the negative electrode plate 18 includes a negative electrode current collector 16 and negative electrode active material layers 17 provided on both surfaces of the negative electrode current collector 16.
- the separator 15 is disposed between the positive electrode plate 14 and the negative electrode plate 18.
- a plurality of separators 15 typically two are used.
- the electrode plate group 30 is impregnated with a non-aqueous electrolyte.
- the electrode plate group 30 is wound in a spiral shape.
- a porous elastic member 21 is incorporated in the corner portion 31 of the electrode plate group 30 in the winding direction inside the outermost peripheral part of the wound electrode plate group 30.
- the elastic member 21 plays a role of absorbing expansion of the electrode plate group 30 accompanying charging.
- the outermost peripheral portion of the electrode plate group 30 includes a winding end portion 32 as a terminal portion.
- the winding end portion 32 is composed of the positive electrode current collector 12 and is fixed to the positive electrode current collector 12 itself with an adhesive tape 19 (adhesive body).
- the “corner portion 31” is an arc-shaped portion of the wound electrode plate group 30.
- the “winding direction” is a direction parallel to the longitudinal direction of the electrode plate group 30 in an unwound state and orthogonal to the thickness direction of the battery 10.
- the elastic member 21 is also possible to incorporate the elastic member 21 in a portion other than the corner portion 31 as in a modification example described later. However, if the elastic member 21 is incorporated only in the corner portion 31 as in this embodiment, an increase in the thickness of the electrode plate group 30 due to the elastic member 21 itself can be avoided. Even if the elastic member 21 is incorporated only in the corner portion 31, the effect of suppressing the increase in the thickness of the battery 10 due to charging can be sufficiently obtained.
- the electrode plate group 30 has two corner portions 31 in the winding direction.
- the elastic member 21 is incorporated in each of the two corner portions 31.
- the effect of suppressing deformation of the electrode plate group 30 can be obtained uniformly in the in-plane direction of the battery 10.
- the improvement of the effect which suppresses the increase in the thickness of the battery 10 can also be anticipated.
- the elastic member 21 is incorporated only in one corner portion 31, the effect of suppressing the increase in thickness can be obtained to some extent.
- the outermost peripheral portion of the electrode plate group 30 is composed of only the positive electrode current collector 12. That is, the positive electrode active material layer 13 is not provided on the positive electrode current collector 12 constituting the outermost peripheral portion.
- the winding end portion 32 is also composed of only the positive electrode current collector 12.
- the elastic member 21 is disposed only on the positive electrode current collector 12 in the positive electrode plate 14. Specifically, the elastic member 21 is formed between the portion of the positive electrode current collector 12 that constitutes the outermost peripheral portion and the portion of the positive electrode current collector 12 that is located on the inner side of the outer periphery when viewed from the outermost peripheral portion. Is arranged.
- a positive electrode active material layer 13 is provided only on one side of the positive electrode current collector 12 located on one inner side as viewed from the outermost peripheral part. Thus, if the elastic member 21 is disposed in a region where the positive electrode active material layer 13 is not provided, it is possible to avoid the generation of an active material that does not contribute to power generation.
- the outermost peripheral portion of the electrode plate group 30 is configured with only the negative electrode current collector 16 by reversing the positional relationship between the positive electrode plate 14 and the negative electrode plate 18.
- the elastic member 21 is disposed between the portion of the negative electrode current collector 16 constituting the outermost peripheral portion and the portion of the negative electrode current collector 16 positioned on the inner side of the outer periphery when viewed from the outermost peripheral portion. Can be arranged.
- the portion composed of only the positive electrode current collector 12 is formed about one round. However, even if the portion constituted only by the positive electrode current collector 12 or the negative electrode current collector 16 is formed more than one round, the portion is included in the concept of the “outermost peripheral portion”. In other words, in the “outermost peripheral portion”, the positive electrode active material layer and the negative electrode active material layer do not face each other.
- the elastic member 21 When the elastic member 21 is disposed in the portion of the positive electrode current collector 12 where the positive electrode active material layer 13 is not provided, the following effects are obtained. First, the dimension of the electrode plate group 30 can be reduced by not providing the positive electrode active material layer 13. Furthermore, the elastic member 21 can be easily attached to the surface of the portion of the positive electrode current collector 12 where the positive electrode active material layer 13 is not provided with an adhesive, an adhesive tape, or the like. Such an effect can be similarly obtained when the outermost peripheral portion is constituted only by the negative electrode current collector 16.
- the present inventor conducted the following preliminary experiment.
- a spacer (first spacer) having a thickness of 45 ⁇ m and a width of 10 mm was prepared.
- an 8-fold electrode group was produced by a method described later with reference to FIG.
- the first spacers were inserted into the corner portions at every number of turns. That is, a total of 16 first spacers were used.
- the first spacer was extracted from the electrode plate group. Thereby, the electrode group which the space derived from the 1st spacer was formed in the corner part of all winding frequency was obtained.
- the obtained electrode plate group was accommodated in a battery case.
- a spacer (second spacer) having a thickness of 360 ⁇ m and a width of 10 mm was prepared.
- an 8-fold electrode group was produced by a method described later with reference to FIG.
- the second spacers were respectively inserted into the two corner portions inside the outermost peripheral portion.
- the second spacer was extracted from the electrode plate group.
- an electrode plate group in which spaces derived from the second spacers were formed at the two corner portions inside the outermost peripheral portion was obtained.
- the obtained electrode plate group was accommodated in a battery case.
- the elastic member 21 it is most convenient to incorporate the elastic member 21 inside the outermost peripheral portion. This is because if the elastic member 21 is disposed in the portion where the active material layers 13 and 17 are provided inside the electrode plate group 30, the active material in the portion covered with the elastic member 21 is wasted. A portion where the active material layers 13 and 17 are not provided may be formed inside the electrode plate group 30, but each step for forming the active material layers 13 and 17 on the current collectors 12 and 16 is performed. Can be complicated. In addition, the capacity of the battery may be reduced.
- the elastic member 21 can be made of a porous material.
- the expansion of the electrode plate group 30 can be absorbed by the change in the shape and volume of the elastic member 21 itself.
- a material such as mere rubber does not have porosity, and hardly undergoes a change in volume even when subjected to a load. Therefore, as a material of the elastic member 21 in the present invention, The utility value is low.
- the elastic member 21 preferably has insulating properties, and can typically be made of a resin material.
- the elastic member 21 can be made of at least one material selected from the group consisting of polyethylene, polypropylene, and polyurethane. These materials are preferable because they do not dissolve in a general electrolyte solution of a lithium ion secondary battery and do not affect the characteristics of the battery.
- the elastic member 21 can be comprised with the foam of the said material. Foams of the above materials undergo a change in shape and volume when subjected to a load. That is, the properties required for the elastic member 21 are satisfied. Both open cell foams and closed cell foams can be used.
- the “elasticity” required for the elastic member 21 does not necessarily mean rubber elasticity, but means elasticity in a range in which expansion of the electrode plate group 30 can be allowed by change in shape and volume.
- a material that causes a volume change of 10% or more when a pressure of 10 MPa is applied at room temperature can be used for the elastic member 21.
- the elastic member 21 has a property that it can be easily restored to its original shape after being deformed, the elastic member 21 can be sandwiched and transported in the process of manufacturing the battery 10.
- the dimension of the elastic member 21 is not particularly limited, and should be appropriately adjusted according to the design of the electrode plate group 30 into which the elastic member 21 is to be incorporated.
- the dimension W 1 of the elastic member 21 is, for example, the dimension W 2 or more of the positive electrode current collector 12 and the dimension W of the separator 15. Can be adjusted to 3 or less. That is, with respect to the width direction WD, the elastic member 21 is provided in a range that crosses the positive electrode current collector 12. In this way, the expansion of the electrode plate group 30 in the in-plane direction of the battery 10 can be uniformly absorbed.
- the elastic member 21 has a predetermined length L 1 with respect to the longitudinal direction LD of the electrode plate group 30.
- the predetermined length L 1 is adjusted within a range in which the thickness of the battery 10 is not increased by the elastic member 21 when the elastic member 21 is incorporated only in the corner portion 31.
- the shape of the elastic member 21 is not particularly limited, and various shapes such as a plate shape, a square bar shape, and a round bar shape can be employed.
- the elastic member 21 may be previously formed in a shape along the corner portion 31, for example, a shape having a crescent-shaped cross section.
- the end of the separator 15 is interrupted immediately before the corner portion 31, but may extend to the corner portion 31. That is, there is a possibility that part or all of the elastic member 21 can be constituted by the end portion of the separator 15.
- the elastic member 21 is configured by a member different from the separator 15. In this case, the elastic member 21 has a thickness that clearly exceeds the thickness of the separator 15. The thickness of the elastic member 21 is specified by the dimension of the elastic member 21 in the thickness direction of the electrode plate group 30 in a state where the electrode plate group 30 is unwound.
- the elastic member 21 as described above is incorporated in the electrode plate group 30.
- the elastic member 21 can absorb the volume expansion of the positive electrode plate 14 due to dedoping of lithium ions from the positive electrode active material and the volume expansion of the negative electrode plate 18 due to doping of lithium ions into the negative electrode active material due to self-contraction. Since the expansion of the electrode plate group 30 accompanying the volume expansion of the electrode plate is allowed during charging, deformation of the electrode plate group 30 can be suppressed and an increase in the thickness of the battery 10 can also be suppressed.
- the positive electrode current collector 12 is made of a metal foil, typically an aluminum foil.
- the metal foil may be subjected to lath processing or etching treatment.
- the positive electrode active material layer 13 includes a positive electrode active material, a binder, and a conductive agent.
- the thickness of the positive electrode plate 14 is in a range where sufficient flexibility can be secured, for example, in the range of 50 to 200 ⁇ m.
- the positive electrode active material is not particularly limited as long as it is a material that can occlude and release lithium ions.
- a lithium-containing transition metal compound can be used.
- the lithium-containing transition metal compound include composite metal oxides of lithium and at least one metal selected from the group consisting of cobalt, manganese, nickel, chromium, iron, and vanadium.
- the composite metal oxide containing lithium include LiCoO 2 , LiMnO 2 , LiNiO 2 , LiCo x Ni (1-x) O 2 (0 ⁇ x ⁇ 1), LiCrO 2 , ⁇ LiFeO 2, and LiVO 2 .
- fluorine resin acrylic rubber, modified acrylic rubber, styrene-butadiene rubber, acrylic resin, vinyl resin, or the like can be used. These binders may be used alone or in combination of two or more. Moreover, you may use the copolymer of 2 or more types of monomers used for resin enumerated above as a binder.
- the binder containing fluorine include polyvinylidene fluoride, a copolymer of vinylidene fluoride and propylene hexafluoride, and polytetrafluoroethylene.
- carbon materials such as acetylene black, graphite, and carbon fiber can be used. These carbon materials may be used alone or in combination of two or more.
- a copper foil or a copper alloy foil can be suitably used, but is not limited thereto.
- the foil include rolled foil and electrolytic foil.
- the shape of the foil is not particularly limited, and may be a perforated foil, an expanded material, a lath material, or the like.
- the electrolytic copper foil which performed the roughening process previously, and the rolled copper foil which performed the roughening process can also be used.
- the negative electrode active material layer 17 includes a negative electrode active material as a main component (a component that is contained most in a mass ratio), and includes a binder and / or a conductive agent as optional components.
- the thickness of the negative electrode plate 18 is in a range where sufficient flexibility can be ensured, for example, in the range of 50 to 210 ⁇ m.
- the negative electrode active material examples include a material capable of reversibly inserting and extracting lithium ions, for example, a material containing graphite having a graphite type crystal structure.
- examples of such materials include natural graphite, spherical or fibrous artificial graphite, non-graphitizable carbon (hard carbon), and graphitizable carbon (soft carbon).
- silicon, tin, an alloy of silicon and tin, an oxide such as silicon oxide or tin oxide, or a nitride such as silicon nitride can be suitably used for obtaining a high energy density.
- the same material as the positive electrode active material layer 13 can be used for the negative electrode active material layer 17.
- the separator 15 examples include polyolefin microporous membranes such as polyethylene microporous membranes and polypropylene microporous membranes. These can be used in a single layer, and a laminate of two or more can also be used. For example, what laminated
- the separator 15 has a thickness in the range of 8 to 30 ⁇ m, for example.
- the electrolytic solution can be prepared by dissolving the electrolyte in a non-aqueous solvent.
- the non-aqueous solvent include ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, ⁇ -butyrolactone, 1,2-dimethoxyethane, 1,2-dichloroethane, 1,3-dimethoxypropane, and 4-methyl.
- -2-pentanone 1,4-dioxane, acetonitrile, propionitrile, butyronitrile, valeronitrile, benzonitrile, sulfolane, 3-methyl-sulfolane, tetrahydrofuran, 2-methyltetrahydrofuran, dimethyl sulfoxide, dimethylformamide, trimethyl phosphate, And triethyl phosphate can be used.
- These non-aqueous solvents can be used alone or as a mixed solvent of two or more.
- a lithium salt having a strong electron withdrawing property can be used.
- LiPF 6 , LiBF 4 , LiClO 4 , LiAsF 6 , LiCF 3 SO 3 , LiN (SO 2 CF 3 ) 2 , LiN (SO 2 C 2 F 5 ) 2 , and LiC (SO 2 CF 3 ) 3 etc. are mentioned.
- These electrolytes may be used alone or in combination of two or more. These electrolytes are dissolved in a non-aqueous solvent at a concentration in the range of 0.5 to 1.8 mol / liter, for example.
- the material of the adhesive tape 19 is not particularly limited as long as it does not dissolve or decompose in the non-aqueous electrolyte.
- Examples of the pressure-sensitive adhesive for the pressure-sensitive adhesive tape 19 include those obtained by partially crosslinking a copolymer of an alkyl acrylate monomer such as butyl acrylate and a monomer such as hydroxyethyl acrylate.
- Examples of the base material of the adhesive tape 19 include non-stretched or stretched films made of a resin such as polyethylene terephthalate, polyphenylene sulfide, polypropylene, polystyrene, polycarbonate, and polymethyl methacrylate.
- a so-called laminate packaging material in which a metal foil such as an aluminum foil is laminated with a resin such as polyethylene terephthalate can be used.
- the laminate wrapping material is advantageous for reducing the weight and thickness of the battery, but has flexibility, and thus is easily affected by deformation of the electrode plate group 30. Therefore, if the present invention is applied to a lithium ion secondary battery using a laminate packaging material, a higher effect can be obtained.
- the electrode plate group 30 may be accommodated in a battery case 41 made of a hard material instead of the laminate packaging material.
- a battery case 41 made of a hard material instead of the laminate packaging material.
- an aluminum alloy containing a trace amount of metal such as manganese or copper or a steel plate plated with nickel can be suitably used as the material of the battery case 41.
- the battery case 41 includes a bottomed case main body 42 that is open at the upper end, and a sealing plate 43 that closes the opening of the case main body 42.
- a negative electrode lead is electrically connected to the polar terminal of the sealing plate 43
- a positive electrode lead is electrically connected to the polar terminal of the case body 42 (or the portion excluding the negative electrode terminal of the sealing plate 43).
- a non-aqueous electrolyte is injected into the battery case 41 from a liquid injection hole (not shown) provided in the sealing plate 43. Thereafter, a liquid injection stopper (not shown) is attached to the liquid injection hole and sealed by laser welding.
- the positive electrode plate 14 can be produced by applying a positive electrode mixture to the belt-like positive electrode current collector 12, drying and rolling.
- the positive electrode mixture can be prepared by mixing a positive electrode active material, a binder, and a conductive agent with an appropriate dispersion medium.
- the positive electrode active material layer 13 can be formed by applying the positive electrode mixture on one or both surfaces of the positive electrode current collector 12, drying and rolling.
- a solvent capable of dissolving the binder is appropriate.
- organic solvents such as N-methyl-2-pyrrolidone, N, N-dimethylformamide, tetrahydrofuran, dimethylacetamide, dimethyl sulfoxide, hexamethylsulfuramide, tetramethylurea, acetone, and methyl ethyl ketone are preferably used. It can. These organic solvents may be used alone or in combination of two or more. Further, water or warm water may be used as a dispersion medium as long as the binder can be dissolved.
- additives such as a dispersant, a surfactant, and a stabilizer may be added to the positive electrode mixture as necessary.
- a thickener such as ethylene-vinyl alcohol copolymer, carboxymethyl cellulose, and methyl cellulose may be added to the positive electrode mixture.
- the method for applying the positive electrode mixture to the positive electrode current collector 12 is not particularly limited. For example, it can be easily applied using a slit die coater, reverse roll coater, lip coater, blade coater, knife coater, gravure coater, dip coater, or the like.
- the method for drying the applied positive electrode mixture is not particularly limited, and either natural drying or heat drying can be employed. In consideration of productivity, for example, a method of drying at an ambient temperature of 70 to 200 ° C. for 10 minutes to 5 hours can be recommended.
- Rolling can be performed using a roll press. Rolling may be performed several times so that the positive electrode active material layer 13 having a predetermined thickness is formed, or rolling may be performed while changing the pressure.
- the negative electrode plate 18 can also be produced by applying a negative electrode mixture on the strip-shaped negative electrode current collector 16, drying and rolling.
- the negative electrode mixture can be prepared by mixing the negative electrode active material with an appropriate dispersion medium.
- the negative electrode active material layer 17 can be formed by applying, drying and rolling the negative electrode mixture on one side or both sides of the negative electrode current collector 16.
- the negative electrode mixture may contain additives such as a binder, a conductive agent, and a thickener as necessary.
- the negative electrode active material layer 17 can be formed by depositing these high capacity materials on the negative electrode current collector 16 by a vacuum process.
- vacuum processes such as vapor deposition, sputtering, and CVD (Chemical Vapor Deposition Method) can be employed.
- the vapor deposition method is desirable from the viewpoint of efficiently forming the negative electrode active material layer 17.
- the vapor deposition method either electron beam vapor deposition or resistance heating vapor deposition can be employed.
- oxides and / or nitrides of high capacity materials oxides and / or nitrides can be used as evaporation materials.
- reactive vapor deposition may be performed by supplying oxygen gas, nitrogen gas, or an ionized or radicalized version of these gases to the upper side of the evaporation source while evaporating the high-capacity material.
- a portion composed only of the positive electrode current collector 12 remains in the portion of the positive electrode plate 14 that should constitute the outermost peripheral portion of the electrode plate group 30.
- a portion composed only of the negative electrode current collector 16 is left in the portion of the negative electrode plate 18 that is to constitute the winding start portion of the electrode plate group 30 in order to attach the negative electrode lead 34.
- the positive electrode plate 14 and the negative electrode plate 18 produced by the above method are each subjected to the next step while being wound around a supply roll.
- the separator 15 is also cut into a desired width in advance and is subjected to the next step while being wound around a supply roll.
- step S2 a step of forming the electrode plate group 30 by combining the positive electrode plate 14, the separator 15 and the negative electrode plate 18 is performed (step S2). Specifically, as shown in FIG. 7, the positive electrode plate 14, the separator 15, and the negative electrode plate 18 are fed out from the supply rolls 44 to 47 toward the bonding roll 48. In the laminating roll 48, the positive electrode plate 14, the separator 15, and the negative electrode plate 18 are bonded together to form an unrolled electrode plate group 30. In order to obtain the wound electrode plate group 30 having the structure shown in FIG. 3, the positive electrode plate 14, the separator 15, and the negative electrode plate 18 are each cut to a predetermined length immediately before the bonding roll 48. Sufficient tension is applied to the positive electrode plate 14, the separator 15, and the negative electrode plate 18 so as not to cause so-called winding deviation.
- step S3 a step of winding the electrode plate group 30 is performed. Specifically, as shown in FIG. 7, the electrode plate group 30 is wound around the winding core 36.
- the elastic member 21 is disposed on the positive electrode current collector 12 while performing the winding process (step S4). That is, the process of arrange
- the winding core 36 and the transport roller 49 and the actuator for driving the laminating roll 48 and the like are temporarily stopped.
- the component supply machine 37 holds the elastic member 21 in advance. While checking the position of the positive electrode current collector 12 with a detector such as a CCD (Charge-Coupled Device) camera, the elastic member 21 is transferred from the component feeder 37 onto the positive electrode current collector 12.
- the elastic member 21 can be attached to the positive electrode current collector 12 using an adhesive tape, an adhesive, or the like.
- the step of winding the electrode plate group 30 and the step of arranging the elastic member 21 are alternately performed so that the elastic member 21 is incorporated in both corner portions 31 of the wound electrode plate group 30.
- positions the elastic member 21 on the positive electrode electrical power collector 12 is not limited to the example shown in FIG.
- the step of arranging the elastic member 21 can be performed between the step of preparing the positive electrode plate 14, the separator 15, and the negative electrode plate 18 and the step of winding the electrode plate group 30.
- the elastic member 21 can be disposed on the positive electrode current collector 12 on the transport path between the supply roll 47 and the bonding roll 48.
- the elastic member 21 can be disposed on the negative electrode current collector 16.
- a method of arranging the elastic member 21 on the separator 15 is also conceivable.
- the elastic member 21 is incorporated into at least one corner portion 31 of the electrode plate group 30 in the winding direction inside the outermost peripheral portion of the wound electrode plate group 30 from the end of the winding process.
- the elastic member 21 can be disposed on the positive electrode plate 14, the negative electrode plate 18 or the separator 15.
- step S5 When the elastic member 21 has been disposed on the positive electrode current collector 12, the winding core 36, the transport roller 49, and the like are rotated again to wind the electrode plate group 30 to the end (step S5).
- the winding end portion 32 is fixed with the adhesive tape 19 (step S6).
- the electrode plate group 30 is pressed so as to have a predetermined thickness (step S7). Thereby, a flat shape is given to the electrode plate group 30.
- the electrode plate group 30 is accommodated in the battery case 11 (or 41) (step S8). After injecting the electrolyte into the battery case 11, the battery case 11 is sealed (steps S9 and S10). Thereby, the battery 10 having the electrode plate group 30 in which the elastic member 21 is incorporated in the corner portion 31 is obtained. Note that press working can be omitted.
- Winding deviation is a phenomenon in which the positions of the positive electrode plate, the negative electrode plate, and the separator deviate from the designed positions. The occurrence of “winding deviation” causes a decrease in yield and productivity.
- some jig is attached to the electrode plate group during the winding process.
- a method of inserting the can also be considered.
- such a method is not practical considering that the speed of winding the electrode group is very fast.
- it is difficult to insert a jig into the electrode plate group during the winding process unless the winding speed is significantly reduced.
- the problem of an increase in thickness is less likely to occur than in the case of a flat electrode plate group. This is because a cylindrical electrode plate group is less likely to deform than a flat electrode plate group due to self-binding. However, this does not prevent application of the present invention to a cylindrical lithium ion secondary battery.
- the elastic member 21 described in the embodiment may extend to a position overlapping the terminal end of the positive electrode active material layer 13. According to such a structure, the following effects can be obtained.
- the negative electrode active material layer is generally wider than the positive electrode active material layer in plan view.
- an insulating tape such as polyphenylene sulfide is provided between the positive electrode plate and the separator so as to cover the positive electrode active material layer at the end of the positive electrode active material layer, or It arrange
- This insulating tape is different from the elastic member 21 in the present invention.
- the elastic member 21 in the present invention and the insulating tape in the conventional lithium ion secondary battery are configured as one member, the number of parts can be reduced and the number of processes may be reduced.
- the elastic member 21 ⁇ / b> A extends to a position overlapping the terminal end 13 e of the positive electrode active material layer 13 with respect to the longitudinal direction LD of the electrode plate group 30.
- the elastic member 21A is sandwiched between the positive electrode active material layer 13 and the separator 15 at a position overlapping the terminal end 13e. If the thickness of the elastic member 21A is appropriately adjusted with respect to the longitudinal direction LD, the thin portion of the elastic member 21A can be held between the positive electrode active material layer 13 and the separator 15 without difficulty.
- the elastic member 21 ⁇ / b> A may be sandwiched between the negative electrode active material layer 17 and the separator 15.
- insulation between the positive electrode current collector 12 and the negative electrode active material layer 17 can be reliably ensured, and a defect in the vicinity of the terminal end 13e of the positive electrode active material layer 13, for example, due to lithium deposition A short circuit can be reliably prevented.
- the increase in the number of parts by providing the elastic member 21A additionally can also be avoided.
- the elastic member 21 may be incorporated not only in the corner portion 31 but also in a flat portion of the electrode plate group 30.
- an elastic member 21 having a length corresponding to one turn of the electrode plate group 30 is incorporated inside the outermost peripheral portion of the electrode plate group 30.
- Example 1 A positive electrode mixture was obtained by mixing 100 parts by weight of LiCoO 2 , 2 parts by weight of acetylene black, 3 parts by weight of polyvinylidene fluoride, and an appropriate amount of N-methyl-2-pyrrolidone. This positive electrode mixture was applied on a positive electrode current collector made of a strip-shaped aluminum foil having a thickness of 15 ⁇ m. The positive electrode mixture was not applied to the portion of the positive electrode current collector that should constitute the outermost peripheral portion of the electrode plate group. The applied positive electrode mixture was dried at 110 ° C. for 5 minutes and then rolled three times.
- An aluminum positive electrode lead was fixed to the positive electrode current collector by spot welding.
- an insulating adhesive made of polypropylene was attached to the positive electrode current collector so as to sandwich the positive electrode lead. In this way, a positive electrode plate having a width of 35 mm, a length of 460 mm, and a thickness of 0.14 mm was prepared.
- a nickel negative electrode lead was fixed to the negative electrode current collector by spot welding.
- an insulating adhesive made of polypropylene was attached to the negative electrode current collector so as to sandwich the negative electrode lead. In this way, a negative electrode plate having a width of 36 mm, a length of 450 mm, and a thickness of 0.14 mm was prepared.
- a positive electrode plate and a negative electrode plate were combined through a separator to form an electrode plate group, and the electrode plate group was wound.
- a porous elastic member was incorporated into the two corners of the electrode plate group. The winding end was fixed with an adhesive tape. As a result, an electrode plate group having the structure described with reference to FIG. 3 was obtained.
- a polyethylene microporous film having a thickness of 16 ⁇ m was used as a separator.
- a porous elastic member a polyethylene foam cut into a square bar shape with dimensions of 1 mm x 1 mm x 36 mm (Fujigamika Kogyo Co., Ltd., special polyethylene foam (30 times foamed, closed cell), thickness 1 mm) is used. It was.
- An adhesive (acrylic adhesive) was used to attach the elastic member to the positive electrode current collector.
- a tape having a base material made of polyphenylene sulfide having a thickness of 20 ⁇ m and a pressure-sensitive adhesive layer made of butyl acrylate having a thickness of 5 ⁇ m was used.
- the obtained electrode plate group was accommodated in a battery case made of a laminate packaging material.
- a laminate packaging material a 100 ⁇ m-thick aluminum foil having both sides bonded with a 10 ⁇ m-thick polypropylene film was used.
- the electrode plate group was vacuum dried at a temperature of 85 ° C. for 2 hours. After the completion of drying, the amount of water contained in the electrode plate group was measured with a Karl Fischer moisture meter. It was confirmed that the moisture content of the electrode plate group was 100 ppm or less.
- LiPF 6 as an electrolyte was dissolved in a mixed solvent containing ethyl carbonate and ethyl methyl carbonate in a volume ratio of 1: 2 at a concentration of 1.0 mol / liter. Thereby, a non-aqueous electrolyte was obtained. A non-aqueous electrolyte was poured into the battery case, and the battery case was sealed by heat welding. In this manner, a prismatic lithium ion secondary battery having a battery capacity (design value) of 800 mAh was obtained.
- Example 1 A square lithium ion secondary battery was manufactured in the same manner as in Example 1 except that the elastic member was not incorporated.
- Example 2 A square lithium ion secondary battery was manufactured in the same manner as in Example 1 except that an adhesive tape having a structure shown in FIG. 10 was used as an adhesive tape for fixing the winding end.
- the pressure-sensitive adhesive tape 50 shown in FIG. 10 includes a base material 51 and pressure-sensitive adhesive layers 52 provided at both ends of the base material 51. According to the adhesive tape 50, the expansion of the electrode plate group is allowed by the extension of the fold portion 53. That is, the second comparative example is an example in which the fourth embodiment of Japanese Patent Laid-Open No. 2006-302801 is reproduced.
- the battery is charged with a constant current of 800 mA (1.0 CmA) until the battery voltage reaches 4.2 V, and further, the constant voltage until the current decays to 40 mA (0.05 CmA). Charged with. It took about 2 hours to charge. After charging, the thickness of the flat portion of the battery was measured at 9 points using a thickness gauge, and the average value of the 9 points was determined as “the initial thickness of the battery”. The results are shown in Table 1.
- Example 1 shows good results for all the batteries. That is, in Example 1, variation in the obtained effect was small. According to Example 1, since the expansion
- the present invention is useful for a flat lithium ion secondary battery, particularly a thin lithium ion secondary battery as a power source for small electronic devices.
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Abstract
Description
扁平な形状を有するリチウムイオン二次電池であって、
正極板、負極板およびセパレータを含み、扁平な形状に巻かれた極板群と、
前記極板群の最外周部分の内側であって巻き方向に関する前記極板群のコーナー部分に組み込まれた、多孔性を有する弾性部材と、
を備えた、リチウムイオン二次電池を提供する。
扁平な形状を有するリチウムイオン二次電池を製造する方法であって、
正極板、セパレータおよび負極板を準備する工程と、
前記正極板、前記セパレータおよび前記負極板を組み合わせて極板群を形成するとともに、前記極板群を巻く工程と、
前記極板群の最外周部分の内側であって巻き方向に関する前記極板群のコーナー部分に、多孔性を有する弾性部材が組み込まれるように、前記巻き工程の終了時点よりも前の段階で、前記弾性部材を前記正極板、前記負極板または前記セパレータの上に配置する工程と、
前記極板群の巻き終わり部を固定する工程と、
を含む、リチウムイオン二次電池の製造方法を提供する。
実施形態で説明した弾性部材21は、正極活物質層13の終端に重なる位置まで延びていてもよい。そのような構造によると、次のような効果が得られる。当業者に知られているように、負極活物質層は、一般に、平面視で、正極活物質層よりも広い。また、リチウムイオン二次電池の安全性を高めるために、従来から、ポリフェニレンサルファイド等の絶縁テープを正極活物質層の終端において、正極活物質層を覆うように正極板とセパレータとの間、または負極活物質層を覆うように負極板とセパレータとの間に配置している。この絶縁テープは、本発明における弾性部材21とは異なるものである。しかし、本発明における弾性部材21と、従来のリチウムイオン二次電池における絶縁テープとを一つの部材で構成すれば、部品点数を削減できるとともに、工程数も削減できる可能性がある。
LiCoO2を100重量部、アセチレンブラックを2重量部、ポリフッ化ビニリデンを3重量部、および適量のN-メチル-2-ピロリドンを混合して正極合剤を得た。この正極合剤を、厚さ15μmの帯状のアルミニウム箔でできた正極集電体上に塗布した。極板群の最外周部分を構成するべき正極集電体の部分には正極合剤を塗布しなかった。塗布した正極合剤を110℃で5分間乾燥させた後、3回圧延を行った。
弾性部材を組み込まなかった点を除き、実施例1と同じ方法で角型リチウムイオン二次電池を製造した。
巻き終わり部を固定するための粘着テープとして、図10に示す構造を有するものを用いた点を除き、実施例1と同じ方法で角型リチウムイオン二次電池を製造した。図10に示す粘着テープ50は、基材51と、基材51の両端に設けられた粘着剤層52とで構成されている。粘着テープ50によると、折り目部53が伸びることによって極板群の膨張が許容される。すなわち、本比較例2は、特開2006-302801号公報の実施例4を再現した例である。
実施例1、比較例1および比較例2の電池を3個ずつ製造し、各電池の初期厚さを以下の方法で測定した。なお、組み立て直後の各電池は、設計値として、4.9mmの厚さを有していた。
Claims (11)
- 扁平な形状を有するリチウムイオン二次電池であって、
正極板、負極板およびセパレータを含み、扁平な形状に巻かれた極板群と、
前記極板群の最外周部分の内側であって巻き方向に関する前記極板群のコーナー部分に組み込まれた、多孔性を有する弾性部材と、
を備えた、リチウムイオン二次電池。 - 前記弾性部材が前記コーナー部分だけに組み込まれている、請求項1に記載のリチウムイオン二次電池。
- 前記極板群が前記巻き方向に関して2つの前記コーナー部分を有し、
2つの前記コーナー部分のそれぞれに前記弾性部材が組み込まれている、請求項1に記載のリチウムイオン二次電池。 - 前記正極板が、正極活物質層および正極集電体を含み、
前記負極板が、負極活物質層および負極集電体を含み、
前記極板群の最外周部分を構成している前記正極集電体または前記負極集電体の上に前記正極活物質層または前記負極活物質層が設けられていない、請求項1に記載のリチウムイオン二次電池。 - 前記弾性部材は、ポリエチレン、ポリプロピレンおよびポリウレタンからなる群より選ばれる少なくとも1つの材料でできている、請求項1に記載のリチウムイオン二次電池。
- 前記弾性部材が前記材料の発泡体で構成されている、請求項5に記載のリチウムイオン二次電池。
- 扁平な形状を有するリチウムイオン二次電池を製造する方法であって、
正極板、セパレータおよび負極板を準備する工程と、
前記正極板、前記セパレータおよび前記負極板を組み合わせて極板群を形成するとともに、前記極板群を巻く工程と、
前記極板群の最外周部分の内側であって巻き方向に関する前記極板群のコーナー部分に、多孔性を有する弾性部材が組み込まれるように、前記巻き工程の終了時点よりも前の段階で、前記弾性部材を前記正極板、前記負極板または前記セパレータの上に配置する工程と、
前記極板群の巻き終わり部を固定する工程と、
を含む、リチウムイオン二次電池の製造方法。 - 前記弾性部材を前記コーナー部分だけに組み込む、請求項7に記載のリチウムイオン二次電池の製造方法。
- 前記巻き方向に関して前記極板群が2つの前記コーナー部分を有し、
2つの前記コーナー部分のそれぞれに前記弾性部材を組み込む、請求項7に記載のリチウムイオン二次電池の製造方法。 - 前記正極板が、正極活物質層および正極集電体を含み、
前記負極板が、負極活物質層および負極集電体を含み、
前記極板群の最外周部分を構成している前記正極集電体または前記負極集電体の上に前記正極活物質層または前記負極活物質層が設けられておらず、
前記弾性部材を配置する工程において、前記正極板における前記正極集電体だけの部分または前記負極板における前記負極集電体だけの部分に、前記弾性部材を配置する、請求項7に記載のリチウムイオン二次電池の製造方法。 - 前記準備工程と前記巻き工程との間、または前記巻き工程の途中に、前記弾性部材を配置する工程を実施する、請求項7に記載のリチウムイオン二次電池の製造方法。
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JP2011525341A JP4898975B2 (ja) | 2010-01-13 | 2011-01-12 | リチウムイオン二次電池およびその製造方法 |
CN201180001081.1A CN102318127B (zh) | 2010-01-13 | 2011-01-12 | 锂离子二次电池及其制造方法 |
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WO2013047426A1 (ja) * | 2011-09-28 | 2013-04-04 | 住友ベークライト株式会社 | リチウムイオン二次電池の製造方法 |
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JP2015092460A (ja) * | 2013-10-01 | 2015-05-14 | 株式会社Gsユアサ | 蓄電素子及び蓄電装置 |
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JP5775330B2 (ja) * | 2011-03-02 | 2015-09-09 | 住友電気工業株式会社 | 溶融塩電池 |
US9324981B2 (en) * | 2012-01-20 | 2016-04-26 | GM Global Technology Operations LLC | Cell frame for extended range electric vehicle battery module |
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JP2014127242A (ja) * | 2012-12-25 | 2014-07-07 | Hitachi Maxell Ltd | リチウム二次電池 |
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JP7263340B2 (ja) | 2018-06-07 | 2023-04-24 | 三洋電機株式会社 | 非水電解質二次電池 |
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