WO2022270042A1 - 電池の製造方法 - Google Patents
電池の製造方法 Download PDFInfo
- Publication number
- WO2022270042A1 WO2022270042A1 PCT/JP2022/011262 JP2022011262W WO2022270042A1 WO 2022270042 A1 WO2022270042 A1 WO 2022270042A1 JP 2022011262 W JP2022011262 W JP 2022011262W WO 2022270042 A1 WO2022270042 A1 WO 2022270042A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cutting
- battery
- laminate
- electrode layer
- negative electrode
- Prior art date
Links
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 238000005520 cutting process Methods 0.000 claims abstract description 195
- 239000007784 solid electrolyte Substances 0.000 claims abstract description 62
- 230000003746 surface roughness Effects 0.000 claims abstract description 43
- 238000010008 shearing Methods 0.000 claims description 10
- 238000003475 lamination Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 26
- 238000011156 evaluation Methods 0.000 description 12
- 238000001035 drying Methods 0.000 description 9
- 239000002131 composite material Substances 0.000 description 8
- 229910003480 inorganic solid Inorganic materials 0.000 description 8
- 239000007774 positive electrode material Substances 0.000 description 7
- 238000007665 sagging Methods 0.000 description 7
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- 238000010248 power generation Methods 0.000 description 6
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- 239000007773 negative electrode material Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
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- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000002001 electrolyte material Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- -1 lithium-nickel-cobalt-aluminum Chemical compound 0.000 description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000002203 sulfidic glass Substances 0.000 description 3
- 239000008096 xylene Substances 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 239000006230 acetylene black Substances 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000002134 carbon nanofiber Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000003273 ketjen black Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000005279 LLTO - Lithium Lanthanum Titanium Oxide Substances 0.000 description 1
- 229910018091 Li 2 S Inorganic materials 0.000 description 1
- 229910018111 Li 2 S-B 2 S 3 Inorganic materials 0.000 description 1
- 229910018127 Li 2 S-GeS 2 Inorganic materials 0.000 description 1
- 229910018133 Li 2 S-SiS 2 Inorganic materials 0.000 description 1
- 229910018119 Li 3 PO 4 Inorganic materials 0.000 description 1
- 229910009178 Li1.3Al0.3Ti1.7(PO4)3 Inorganic materials 0.000 description 1
- 229910002984 Li7La3Zr2O12 Inorganic materials 0.000 description 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 1
- 229910010252 TiO3 Inorganic materials 0.000 description 1
- NXPZICSHDHGMGT-UHFFFAOYSA-N [Co].[Mn].[Li] Chemical compound [Co].[Mn].[Li] NXPZICSHDHGMGT-UHFFFAOYSA-N 0.000 description 1
- PFYQFCKUASLJLL-UHFFFAOYSA-N [Co].[Ni].[Li] Chemical compound [Co].[Ni].[Li] PFYQFCKUASLJLL-UHFFFAOYSA-N 0.000 description 1
- SOXUFMZTHZXOGC-UHFFFAOYSA-N [Li].[Mn].[Co].[Ni] Chemical compound [Li].[Mn].[Co].[Ni] SOXUFMZTHZXOGC-UHFFFAOYSA-N 0.000 description 1
- ZYXUQEDFWHDILZ-UHFFFAOYSA-N [Ni].[Mn].[Li] Chemical compound [Ni].[Mn].[Li] ZYXUQEDFWHDILZ-UHFFFAOYSA-N 0.000 description 1
- FDLZQPXZHIFURF-UHFFFAOYSA-N [O-2].[Ti+4].[Li+] Chemical compound [O-2].[Ti+4].[Li+] FDLZQPXZHIFURF-UHFFFAOYSA-N 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 229910002804 graphite Inorganic materials 0.000 description 1
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- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910000664 lithium aluminum titanium phosphates (LATP) Inorganic materials 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- GLNWILHOFOBOFD-UHFFFAOYSA-N lithium sulfide Chemical compound [Li+].[Li+].[S-2] GLNWILHOFOBOFD-UHFFFAOYSA-N 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
- CYQAYERJWZKYML-UHFFFAOYSA-N phosphorus pentasulfide Chemical compound S1P(S2)(=S)SP3(=S)SP1(=S)SP2(=S)S3 CYQAYERJWZKYML-UHFFFAOYSA-N 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D11/00—Combinations of several similar cutting apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/08—Means for treating work or cutting member to facilitate cutting
- B26D7/086—Means for treating work or cutting member to facilitate cutting by vibrating, e.g. ultrasonically
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
-
- 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
-
- 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
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
- H01M10/0562—Solid materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0065—Solid electrolytes
- H01M2300/0068—Solid electrolytes inorganic
-
- 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
Definitions
- the present disclosure relates to a method for manufacturing a battery.
- Patent Document 1 a unit battery is laminated by laminating a positive electrode current collector layer, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode current collector layer in this order. is disclosed.
- Patent Literature 2 discloses a battery manufacturing method in which the voltage is measured after the end of a battery cell is cut, and the end of the battery cell is cut again when the voltage gradually decreases.
- Patent Document 2 does not disclose a cutting method that can suppress the occurrence of burrs and sagging on the cut surface.
- the present disclosure aims to solve the above problems, and aims to provide a method for manufacturing a battery that can achieve both high capacity density and high reliability of the battery.
- a method for manufacturing a battery according to an aspect of the present disclosure includes a laminate including at least one battery cell having a positive electrode layer, a negative electrode layer, and a solid electrolyte layer positioned between the positive electrode layer and the negative electrode layer.
- the surface roughness of one cut surface is Rz1, Rz1 ⁇ W ⁇ 5Rz1 is satisfied.
- both high capacity density and high reliability of the battery can be achieved.
- FIG. 1A is a cross-sectional view showing a cross-sectional configuration of a battery according to Embodiment 1.
- FIG. 1B is a top view of the battery according to Embodiment 1.
- FIG. 2A is a cross-sectional view showing a cross-sectional configuration of a laminate according to Embodiment 1.
- FIG. 2B is a top view of the laminate according to Embodiment 1.
- FIG. 3 is a cross-sectional view for explaining the method for manufacturing the battery according to Embodiment 1.
- FIG. FIG. 4 is a top view for explaining another example of the second direction in the second cutting step.
- FIG. 5 is a cross-sectional view showing a cross-sectional configuration of a laminate according to Embodiment 2.
- FIG. FIG. 6 is a cross-sectional view showing a cross-sectional configuration of another laminate according to Embodiment 2.
- FIG. FIG. 7 is a cross-sectional view for explaining a method for manufacturing a battery according to Embod
- a method for manufacturing a battery according to an aspect of the present disclosure includes a laminate including at least one battery cell having a positive electrode layer, a negative electrode layer, and a solid electrolyte layer positioned between the positive electrode layer and the negative electrode layer.
- the surface roughness of one cut surface is Rz1, Rz1 ⁇ W ⁇ 5Rz1 is satisfied.
- the method for manufacturing a battery according to this aspect can achieve both high capacity density and high reliability of the battery.
- the W may be three times or less the thickness of the laminate.
- the flatness of the second cut surface can be improved, the occurrence of burrs and sagging can be suppressed, and the quality of the second cut surface can be improved.
- first cutting step and the second cutting step may be performed continuously as a series of steps.
- the laminate can be cut continuously without intervening other processes, so productivity can be improved.
- first direction in which cutting of the laminate proceeds at the first cutting position and a first direction in which cutting of the laminate proceeds at the second cutting position
- the two directions may be different.
- the second direction may be a direction perpendicular to the first direction.
- the laminate can be cut by changing the cutting direction between the first cutting step and the second cutting step, so that the laminate can be cut by adjusting the direction according to the quality of the cut surface, ease of cutting, and the like.
- the second direction may be a direction perpendicular to the stacking direction of the stack.
- the burrs or the like are formed so as to extend perpendicularly to the stacking direction of the laminate. Therefore, the occurrence of short circuits is suppressed, and the reliability of the manufactured battery can be improved.
- the at least one battery cell may be a plurality of battery cells, and the plurality of battery cells may be stacked.
- the laminate may be cut by shearing.
- the laminate can be cut simply by shearing the laminate with a knife, and deterioration of the battery cells is less likely to occur, so the productivity and effective volume of the battery can be improved.
- the laminate may be cut with an ultrasonic cutter.
- the surface roughness of the second cut surface may be equal to or less than the thickness of the solid electrolyte layer. Further, for example, the second cut surface may be flat.
- the surface roughness of the second cut surface is equal to or less than the thickness of the solid electrolyte layer, even if convex portions are formed on one of the positive electrode layer and the negative electrode layer on the second cut surface, deformation or the like may occur. Since the convex portion does not reach the other side, it is possible to effectively suppress the occurrence of a short circuit.
- each figure is a schematic diagram and is not necessarily strictly illustrated. Therefore, for example, scales and the like do not necessarily match in each drawing. Moreover, in each figure, substantially the same configurations are denoted by the same reference numerals, and overlapping descriptions are omitted or simplified.
- the x-axis, y-axis and z-axis indicate three axes of a three-dimensional orthogonal coordinate system.
- the x-axis and the y-axis respectively coincide with the directions parallel to the first side of the rectangle and the second side orthogonal to the first side.
- the z-axis coincides with the lamination direction of each layer of the laminate and battery.
- the "stacking direction” corresponds to the direction normal to the main surfaces of the current collector and the active material layer.
- plane view means when viewed from a direction perpendicular to the main surface of the battery or laminate. It should be noted that when “a plane view of a certain plane” is described, such as “a plan view of a cut surface”, it means that the “certain plane” is viewed from the front.
- the terms “upper” and “lower” do not refer to the upward direction (vertically upward) and the downward direction (vertically downward) in absolute spatial recognition, but are based on the stacking order in the stacking structure. It is used as a term defined by a relative positional relationship. Also, the terms “above” and “below” are used only when two components are spaced apart from each other and there is another component between them, as well as when two components are spaced apart from each other. It also applies when two components are in contact with each other and are placed in close contact with each other. In the following description, the negative side of the z-axis is called “lower” or “lower”, and the positive side of the z-axis is called “upper” or “upper”.
- FIG. 1A is a cross-sectional view showing the cross-sectional configuration of battery 1 according to the present embodiment.
- FIG. 1B is a top view of battery 1 according to the present embodiment. Note that FIG. 1A shows a cross section along line Ia-Ia in FIG. 1B.
- battery 1 As shown in FIGS. 1A and 1B, battery 1 according to the present embodiment has positive electrode layer 11, negative electrode layer 12, and solid electrolyte layer 13 positioned between positive electrode layer 11 and negative electrode layer 12.
- a battery cell 10 a positive electrode current collector 14 , and a negative electrode current collector 15 are provided.
- the battery 1 is, for example, an all-solid battery.
- the plan view shape of the battery 1 is, for example, a rectangle.
- the shape of the battery 1 is, for example, a flat rectangular parallelepiped.
- flat means that the thickness (that is, the length in the z-axis direction) is shorter than each side (that is, each length in the x-axis direction and the y-axis direction) or the maximum width of the main surface.
- the plan view shape of the battery 1 may be a square, a parallelogram, a rhombus, or any other quadrangle, or a hexagon, octagon, or any other polygon.
- the shape of the battery 1 is, for example, a rectangular parallelepiped shape, but may be another shape such as a cubic shape, a truncated square pyramid shape, or a polygonal columnar shape.
- the thickness of each layer is exaggerated in order to make the layer structure of the battery 1 easier to understand.
- positive electrode current collector 14 positive electrode layer 11, solid electrolyte layer 13, negative electrode layer 12, and negative electrode current collector 15 have the same shape and size, and their contours match. ing.
- the battery 1 has parallel principal surfaces 16 and 17 facing each other with the battery cell 10 interposed therebetween, and four side surfaces connecting the principal surfaces 16 and 17 .
- Main surface 16 is the top surface of battery 1 .
- Main surface 17 is the bottom surface of battery 1 .
- Each of the four side surfaces extends vertically from each side of the main surface 17 toward the main surface 16, for example.
- the four sides of the battery 1 are, for example, two pairs of sides parallel to each other.
- One pair of side surfaces of the two pairs of side surfaces are the second cut surfaces 120 and 120a formed in the second cutting step, which will be described later.
- At least one of the side surfaces of the battery 1 may be the second cut surface.
- all side surfaces of the battery 1 may be the second cut surface.
- the battery cell 10 is positioned between the positive electrode current collector 14 and the negative electrode current collector 15 .
- the battery 1 includes one battery cell 10, the number of battery cells 10 is not limited to one, and may be two or more.
- the battery according to the present embodiment may be a stacked battery in which a plurality of battery cells 10 are stacked with at least one of positive electrode current collector 14 and negative electrode current collector 15 interposed therebetween.
- the battery 1 is manufactured by cutting the end of a laminate 1a, which will be described later.
- the stacking configuration of the battery 1 is the same as the stacking configuration of the laminate 1a. Details of each layer of the battery 1 will be described later as an explanation of the laminate 1a.
- a tab or lead which is an electrode taken out to the outside, may be connected to at least one of the positive electrode current collector 14 and the negative electrode current collector 15 .
- the battery 1 may be laminated with an exterior body, or the battery 1 may be resin-sealed.
- at least a part of the second cut surfaces 120 and 120a may be covered with an insulating member to protect the cut surfaces.
- the insulating member a material having at least electrical insulation is used, and a material having impact resistance, heat resistance, flexibility and gas barrier properties may be used.
- polymers such as epoxy resins, acrylic resins, methacrylic resins, aramid resins, polyimide resins, or inorganic adhesive materials can be used.
- the manufacturing method of the battery 1 according to the present embodiment includes, for example, a laminate forming process, a first cutting process, and a second cutting process.
- FIG. 2A is a cross-sectional view showing the cross-sectional structure of the laminate 1a according to this embodiment.
- FIG. 2B is a top view of the laminate 1a according to this embodiment. It should be noted that FIG. 2A represents a cross section along line IIa-IIa of FIG. 2B. In addition, in FIG. 2B, the plan view shape of the battery cell 10 is indicated by broken lines.
- laminate 1a In the layered body forming process, the layered body 1a is formed. As shown in FIGS. 2A and 2B, laminate 1a according to the present embodiment includes positive electrode layer 11, negative electrode layer 12, and solid electrolyte layer 13 positioned between positive electrode layer 11 and negative electrode layer 12. A battery cell 10 having a positive electrode current collector 14 and a negative electrode current collector 15 are provided.
- the laminate 1a has parallel main surfaces 16a and 17a facing each other with the battery cell 10 interposed therebetween.
- the main surface 16a is the uppermost surface of the laminate 1a.
- the main surface 17a is the bottom surface of the laminate 1a.
- the positive electrode layer 11 is located between the positive electrode current collector 14 and the solid electrolyte layer 13 .
- the positive electrode layer 11 is arranged in contact with the main surface of the positive electrode current collector 14 on the negative electrode layer 12 side. Note that another layer such as a conductive bonding layer may be provided between the positive electrode layer 11 and the positive electrode current collector 14 .
- the positive electrode layer 11 contains a positive electrode material such as a positive electrode active material.
- a positive electrode material such as a positive electrode active material.
- Various materials capable of extracting and inserting metal ions such as lithium ions or magnesium ions can be used as the material of the positive electrode active material.
- the positive electrode active material in the case of a material that can desorb and insert lithium ions, examples include lithium cobaltate composite oxide (LCO), lithium nickelate composite oxide (LNO), lithium manganate composite oxide (LMO), ), lithium-manganese-nickel composite oxide (LMNO), lithium-manganese-cobalt composite oxide (LMCO), lithium-nickel-cobalt composite oxide (LNCO), lithium-nickel-manganese-cobalt composite oxide (LNMCO ), and lithium-nickel-cobalt-aluminum composite oxide (LNCAO).
- LCO lithium cobaltate composite oxide
- LNO lithium nickelate composite oxide
- LMO lithium manganate composite oxide
- the material contained in the positive electrode layer 11 may include, for example, a solid electrolyte such as an inorganic solid electrolyte.
- a solid electrolyte such as an inorganic solid electrolyte.
- a sulfide solid electrolyte for example, a mixture of lithium sulfide (Li 2 S) and phosphorus pentasulfide (P 2 S 5 ) can be used.
- a sulfide solid electrolyte such as Li 2 S—SiS 2 , Li 2 S—B 2 S 3 or Li 2 S—GeS 2 may be used.
- a sulfide to which at least one of 3 N, LiCl, LiBr, Li 3 PO 4 and Li 4 SiO 4 is added may be used.
- oxide solid electrolyte for example, Li7La3Zr2O12 ( LLZ ), Li1.3Al0.3Ti1.7 ( PO4 ) 3 ( LATP ) or (La,Li) TiO3 ( LLTO) and the like are used.
- the surface of the positive electrode active material may be covered with a solid electrolyte.
- the material contained in the positive electrode layer 11 includes at least one of a conductive material such as acetylene black, Ketjenblack (registered trademark), and carbon nanofiber, and a binding binder such as polyvinylidene fluoride. It may be
- the positive electrode layer 11 is produced by applying a paste-like paint in which the material contained in the positive electrode layer 11 is kneaded together with a solvent onto the main surface of the positive electrode current collector 14 and drying it.
- the positive electrode layer 11 coated onto the positive electrode current collector 14, also called a positive electrode plate may be pressed after drying.
- the thickness of the positive electrode layer 11 is, for example, 5 ⁇ m or more and 300 ⁇ m or less, but is not limited thereto.
- the negative electrode layer 12 is located between the negative electrode current collector 15 and the solid electrolyte layer 13 .
- the negative electrode layer 12 is arranged in contact with the main surface of the negative electrode current collector 15 on the positive electrode layer 11 side. Moreover, the negative electrode layer 12 is arranged to face the positive electrode layer 11 . Note that another layer such as a conductive bonding layer may be provided between the negative electrode layer 12 and the negative electrode current collector 15 .
- the negative electrode layer 12 contains, for example, a negative electrode active material as an electrode material.
- a negative electrode active material as an electrode material.
- Various materials capable of extracting and inserting ions such as lithium ions or magnesium ions may be used as materials for the negative electrode active material.
- the negative electrode active material contained in the negative electrode layer 12 in the case of a material capable of withdrawing and inserting lithium ions, examples include single substances such as graphite, metallic lithium, and silicon, mixtures thereof, and lithium-titanium oxide ( LTO) can be used.
- a solid electrolyte such as an inorganic solid electrolyte may be used.
- the inorganic solid electrolyte for example, the inorganic solid electrolytes exemplified as the material contained in the positive electrode layer 11 can be used.
- the material contained in the negative electrode layer 12 may include at least one of a conductive material such as acetylene black, ketjen black, and carbon nanofiber, and a binding binder such as polyvinylidene fluoride. good.
- the negative electrode layer 12 is produced by applying a paste-like paint in which the material contained in the negative electrode layer 12 is kneaded together with a solvent onto the main surface of the negative electrode current collector 15 and drying it.
- the negative electrode layer 12 coated onto the negative current collector 15, also called a negative electrode plate may be pressed after drying.
- the thickness of the negative electrode layer 12 is, for example, 5 ⁇ m or more and 300 ⁇ m or less, but is not limited thereto.
- the positive electrode layer 11 is in contact with the main surface of the positive electrode current collector 14 .
- the positive electrode current collector 14 may include a current collector layer, which is a layer containing a conductive material and provided in a portion in contact with the positive electrode layer 11 .
- the negative electrode layer 12 is in contact with the main surface of the negative electrode current collector 15 .
- the negative electrode current collector 15 may include a current collector layer, which is a layer containing a conductive material and provided in a portion in contact with the negative electrode layer 12 .
- the positive electrode current collector 14 and the negative electrode current collector 15 are conductive foil-shaped, plate-shaped, or mesh-shaped members, respectively.
- the positive electrode current collector 14 and the negative electrode current collector 15 may each be, for example, a conductive thin film.
- Examples of materials that constitute the positive electrode current collector 14 and the negative electrode current collector 15 include metals such as stainless steel (SUS), aluminum (Al), copper (Cu), and nickel (Ni).
- the positive electrode current collector 14 and the negative electrode current collector 15 may be formed using different materials.
- each of the positive electrode current collector 14 and the negative electrode current collector 15 is, for example, 5 ⁇ m or more and 100 ⁇ m or less, but is not limited to this.
- the solid electrolyte layer 13 is arranged between the positive electrode layer 11 and the negative electrode layer 12 . Solid electrolyte layer 13 is in contact with each of positive electrode layer 11 and negative electrode layer 12 .
- the solid electrolyte layer 13 is a layer containing an electrolyte material. As the electrolyte material, generally known battery electrolytes can be used.
- the thickness of the solid electrolyte layer 13 may be 5 ⁇ m or more and 300 ⁇ m or less, or may be 5 ⁇ m or more and 100 ⁇ m or less.
- the solid electrolyte layer 13 contains a solid electrolyte.
- a solid electrolyte such as an inorganic solid electrolyte can be used.
- the inorganic solid electrolyte the inorganic solid electrolytes exemplified as the material contained in the positive electrode layer 11 can be used.
- the solid electrolyte layer 13 may contain a binding binder such as polyvinylidene fluoride.
- the solid electrolyte layer 13 is produced by applying a paste-like paint in which the material contained in the solid electrolyte layer 13 is kneaded together with a solvent onto the main surface of the positive electrode layer 11 and/or the negative electrode layer 12 and drying the coating.
- the solid electrolyte layer 13 may be produced by applying the paste-like coating material on the release film and drying it.
- the laminate 1a is manufactured by stacking the positive electrode current collector 14, the positive electrode layer 11, the solid electrolyte layer 13, the negative electrode layer 12, and the negative electrode current collector 15 in this order and pressurizing and crimping them.
- a method of pressurization for example, flat press, roll press or isostatic press can be used.
- heating may be performed during pressurization. The heating temperature may be set within a range in which the material of each layer does not undergo a chemical change due to heat.
- the positive electrode layer 11, the negative electrode layer 12, and the solid electrolyte layer 13 are maintained in the form of parallel plates. As a result, it is possible to suppress the occurrence of cracks or collapse due to bending.
- the positive electrode layer 11, the negative electrode layer 12, and the solid electrolyte layer 13 may be combined and smoothly curved.
- the positive electrode layer 11, the negative electrode layer 12, and the solid electrolyte layer 13 are provided on the same side surface, but the present invention is not limited to this.
- the positions of the side surfaces of the positive electrode layer 11, the negative electrode layer 12, and the solid electrolyte layer 13 may be different.
- at least one side surface of the positive electrode layer 11 and the negative electrode layer 12 is covered with the solid electrolyte layer 13 , and the solid electrolyte layer 13 is the positive electrode current collector 14 and the negative electrode current collector 15 . may be in contact with at least one of
- the laminate 1a for example, there is a portion where the positive electrode layer 11 is not provided on the main surface of the positive electrode current collector 14 on the battery cell 10 side.
- the laminate 1a for example, there is a portion where the negative electrode layer 12 is not provided on the main surface of the negative electrode current collector 15 on the battery cell 10 side.
- the solid electrolyte layer 13 may be in contact with at least one of the portion of the positive electrode current collector 14 not provided with the positive electrode layer 11 and the portion of the negative electrode current collector 15 not provided with the negative electrode layer 12 .
- FIG. 3 is a cross-sectional view for explaining the manufacturing method of the battery 1 according to this embodiment.
- the laminate 1a formed in the laminate forming step is cut at first cutting positions 111 and 111a indicated by broken lines in the figure, and the first Cut surfaces 110 and 110a are formed. Thereby, the laminated body 1b shown in FIG. 3(b) is formed.
- the first cut surfaces 110 and 110a are side surfaces connecting the main surface 16b and the main surface 17b of the laminate 1b.
- the laminate 1a is cut at the first cutting position 111 passing through the positive electrode layer 11, the negative electrode layer 12 and the solid electrolyte layer 13 of the battery cell 10.
- the positive electrode current collector 14 and the negative electrode current collector 15 are collectively cut to form a planar first cut surface 110 .
- the first cutting position 111 is a position passing through the two main surfaces 16a and 17a of the laminate 1a.
- the direction in which first cut surface 110 extends is not particularly limited.
- the first cutting plane 110 is, for example, orthogonal to the main surfaces 16a and 17a.
- the first cutting position 111 is not particularly limited.
- the first cutting position 111 may be a position where the end of the laminate 1a is cut, or a position where the laminate 1a is divided into a plurality of laminates.
- the cutting method in the first cutting step for example, shearing with a blade, cutting with an end mill, grinding, laser cutting, or jet cutting can be used, but is not limited to these methods. From the standpoint of improving productivity and effective volume, the cutting method in the first cutting step may be shearing for cutting using a knife or the like.
- first cutting step for example, when the position of the laminate 1a is used as a reference, cutting proceeds along the first direction C10, which is a constant direction, at the first cutting position 111.
- the direction in which cutting progresses is, for example, in the case of shearing using a blade, the direction in which the blade moves relative to the laminate 1a when viewed from above with respect to the first cut surface 110 to be formed.
- the first direction C10 is, for example, a direction orthogonal to the main surfaces 16a and 17a when the first cut surface 110 is viewed in plan, in other words, a direction parallel to the stacking direction of the stack 1a.
- the laminate 1a can be cut along the direction connecting the main surface 16a and the main surface 17a at the shortest distance, so the productivity of the battery 1 is improved.
- the first direction C10 is not particularly limited, and may be a direction that intersects a direction perpendicular to the main surfaces 16a and 17a.
- the laminate 1b formed in the first cutting step is cut into the first cut surface 110 inside the first cut surfaces 110 and 110a. and 110a at distances W and Wa, respectively, to form second cutting planes 120 and 120a, indicated by dashed lines in the figure.
- the battery 1 shown in FIG. 3(c) is formed.
- the laminated body 1b is cut at a second cutting position 121 located inside the first cutting surface 110 by a distance W to obtain a flat surface.
- a second cutting surface 120 having a shape is formed.
- a distance W is the distance between the first cut surface 110 and the second cut surface 120 to be formed. Since the second cutting plane 120 is formed at the second cutting position 121 , the distance W can also be said to be the distance between the first cutting plane 110 and the second cutting position 121 .
- the second cutting position 121 is a position that does not pass through the first cutting plane 110 .
- the first cutting plane 110 and the second cutting plane 120 (in other words, the second cutting position 121) may be parallel. As a result, the distance between the first cutting plane 110 and the second cutting position 121 becomes constant, so that the quality of the second cutting plane is stabilized and the volume cut in the second cutting process can be reduced.
- the positive electrode layer 11, the negative electrode layer 12, the solid electrolyte layer 13, the positive electrode current collector 14, and the negative electrode current collector, which are all the constituent elements of the laminate 1b, are separated from each other.
- the body 15 is collectively cut to form a second cut surface 120 .
- the second cutting position 121 is a position passing through the two main surfaces 16b and 17b of the laminate 1b.
- the second cutting position 121 is near the first cutting plane 110 .
- the relationship between the surface roughness Rz1 of the first cut surface 110 and the distance W satisfies Rz1 ⁇ W ⁇ 5Rz1 .
- the laminate 1b is cut by setting the second cutting position 121 at a position inside the distance W from the top edge of the first cut surface 110, which satisfies the above relationship. If the distance W is less than or equal to the surface roughness Rz 1 of the first cut surface 110, burrs and the like present on the surface of the first cut surface 110 may not be sufficiently removed.
- the surface roughness Rz1 of the first cut surface 110 is difficult to decrease, and the effects of the present disclosure are difficult to obtain.
- the relationship between the surface roughness Rz1 of the first cut surface 110 and the distance W satisfies, for example, Rz1 ⁇ W ⁇ 5Rz1 at any position.
- surface roughness such as surface roughness Rz 1 is maximum height roughness measured by a measuring method conforming to JIS B0601 2013.
- the relationship between the surface roughness Rz1 of the first cut surface 110 and the distance W may satisfy Rz1 ⁇ W ⁇ 4Rz1 .
- the distance W between the first cut surface 110 and the second cut position 121 may be three times or less the thickness of the laminate 1b, or may be two times or less. Thereby, the surface roughness Rz2 of the second cut surface 120 can be reduced more effectively.
- the second cut surface 120 is orthogonal to, for example, the main surfaces 16b and 17b of the laminate 1b.
- the positions of the end surfaces of the respective layers of the battery 1 exposed at the second cut surface 120 are aligned when viewed from the stacking direction, so that the effective volume of the battery can be increased.
- the side surfaces of the positive electrode layer 11, the negative electrode layer 12, the solid electrolyte layer 13, the positive electrode current collector 14, and the negative electrode current collector 15 of the battery 1 are exposed and flush.
- the side surfaces of the positive electrode layer 11, the negative electrode layer 12, the solid electrolyte layer 13, the positive electrode current collector 14, and the negative electrode current collector 15 on the second cut surface 120 The positions match.
- the cutting method in the second cutting step for example, shearing with a knife, cutting with an end mill, grinding, laser cutting, or jet cutting can be used, but is not limited to these methods.
- the cutting method in the second cutting step may be shearing for cutting using a knife or the like.
- the temperature of the laminate 1b is less likely to rise during cutting, and the battery cell 10 is less likely to deteriorate during cutting.
- the shearing may be cutting using an ultrasonic cutter that cuts by transmitting high-frequency vibration to the cutting edge.
- the second cutting step for example, when the position of the laminate 1b is used as a reference, cutting proceeds along the second direction C20, which is a constant direction, at the second cutting position 121.
- the direction in which cutting progresses is similar to the first direction C10. This is the direction of relative movement.
- the second direction C20 is, for example, a direction orthogonal to the main surfaces 16b and 17b when the second cut surface 120 is viewed from above. Therefore, the second direction C20 is parallel to and the same direction as the first direction C10.
- the laminate 1b can be cut along the direction connecting the main surface 16b and the main surface 17b at the shortest distance, so the productivity of the battery 1 is improved.
- the second direction C20 is not particularly limited, and the first direction C10 and the second direction C20 are not limited to a parallel positional relationship.
- FIG. 4 is a top view for explaining another example of the second direction in the second cutting step.
- the first direction C10 and the second direction C21 are not parallel but different directions.
- the second direction C21 is a direction perpendicular to the first direction C10 and a direction perpendicular to the lamination direction of the laminate 1b (for example, the longitudinal direction of the first cut surface 110). With such first direction C10 and second direction C21, it becomes easy to arrange the first cutting position 111 at an arbitrary position of the laminate 1a in the first cutting step.
- the direction in which the cutting progresses in the second cutting step is perpendicular to the stacking direction of the laminate 1b, even if burrs or the like are generated by cutting, the burrs or the like are formed so as to extend perpendicularly to the stacking direction. Therefore, the occurrence of short circuits between the layers of the laminate 1b is suppressed, and the reliability of the battery 1 can be improved.
- the 1st direction C10 and the 2nd direction C21 are different directions, it does not restrict to the above-mentioned example. Since the first direction C10 and the second direction C21 are different, the direction is adjusted according to the quality of the cut surface, the ease of cutting, etc., in the first cutting step and the second cutting step, and the laminate 1a and the The laminate 1b can be cut.
- the surface roughness Rz2 of the second cut surface 120 may be, for example, greater than 0 and equal to or less than the thickness of the solid electrolyte layer 13 . Since the surface roughness Rz2 of the second cut surface 120 is equal to or less than the thickness of the solid electrolyte layer 13, even if a convex portion is formed on one of the positive electrode layer 11 and the negative electrode layer 12 on the second cut surface 120, Since the convex portion does not reach the other side when deformation or the like occurs, it is possible to effectively suppress the occurrence of a short circuit. Also, the surface roughness Rz2 of the second cut surface 120 may be smaller than the thickness of the solid electrolyte layer 13 .
- the surface roughness Rz2 of the second cut surface 120 may be 30 ⁇ m or less, or may be 20 ⁇ m or less. Also, the second cut surface 120 may be flat. Thereby, the reliability of the battery 1 can be improved.
- "flat" means substantially flat, and means that the surface roughness Rz2 is 10 ⁇ m or less, for example.
- the first cutting step and the second cutting step may be performed continuously as a series of steps. This can improve productivity.
- performing continuously as a series of steps means that, between the first cutting step and the second cutting step, without performing other steps such as processing or measuring the laminate 1a, the first cutting step is performed. It means performing a first cutting step and a second cutting step.
- the laminate 1a may be fixed for cutting, and the second cutting step may be performed while maintaining the fixation after the laminate 1a is cut.
- the first cutting step and the second cutting step may be performed by a cutting device in a continuous production line.
- the second cutting step may be performed within one minute after the first cutting step is finished.
- the battery 1 having the second cut surfaces 120 and 120a as shown in FIG. 3(c) is manufactured.
- the formation of the first cut surface 110 and the second cut surface 120 is mainly described, but the same applies to the first cut surface 110a and the second cut surface 120a, so detailed description is omitted.
- the number of the first cut surface and the number of the second cut surface are two, respectively, but the present invention is not limited to this, and the number of each should be at least one.
- at least one side surface of the battery 1 according to the present embodiment should be the second cut surface. From the viewpoint of further improving capacity density and reliability, all side surfaces of battery 1 may be the second cut surface.
- second cut surface 120 is formed at the first cutting step in which first cut surface 110 is formed and at second cutting position 121 close to first cut surface 110 .
- a second cutting step is performed.
- the ratio of the effective volume, which is the volume that contributes to power generation, in the battery 1 can be improved.
- the relationship between the surface roughness Rz 1 of the first cut surface 110 and the distance W satisfies Rz 1 ⁇ W ⁇ 5Rz 1 , so that burrs and sagging formed in the first cutting step are eliminated.
- Embodiment 2 Next, a method for manufacturing a battery according to Embodiment 2 will be described.
- the second embodiment differs from the first embodiment in the number of battery cells included in the laminate. The differences will be described below, and the description of the common points will be omitted or simplified.
- FIG. 5 is a cross-sectional view showing the cross-sectional configuration of the laminate 2a according to this embodiment.
- the layered body 2a is formed in the layered body forming step, and the layered body 2a is cut in the first cutting step.
- the laminate 2 a has a plurality of battery cells 10 , positive electrode current collectors 14 and negative electrode current collectors 15 .
- the plurality of battery cells 10 are stacked such that adjacent battery cells 10 are electrically connected via current collectors.
- the negative electrode layer 12 is arranged on the upper and lower main surfaces of the negative electrode current collector 15 .
- the plurality of battery cells 10 are stacked so as to be electrically connected in parallel by electrically connecting the same poles of the adjacent battery cells 10 via the current collector. Therefore, the stacking order is reversed between adjacent battery cells 10 .
- Each battery cell 10 is sandwiched between a positive electrode current collector 14 and a negative electrode current collector 15 without interposing other battery cells 10 .
- the negative electrode layer 12 is produced by coating both main surfaces of the negative electrode current collector 15 with a paste-like paint in which the material contained in the negative electrode layer 12 is kneaded together with a solvent and then drying.
- a paste-like paint in which the material contained in the negative electrode layer 12 is kneaded together with a solvent and then drying.
- the negative electrode layer 12 coated onto the negative current collector 15, also called a negative electrode plate may be pressed after drying.
- the solid electrolyte layer 13 and the positive electrode layer 11 are manufactured by the same method as in the first embodiment. Moreover, the laminated body 2a is crimped by a method similar to that of the first embodiment.
- the laminated body 2a may have a structure in which the positions of the negative electrode layer 12 and the positive electrode layer 11 are exchanged.
- the number of the plurality of battery cells 10 is two, the number may be three or more.
- the number of battery cells 10 can be increased by arranging the positive electrode layers 11 on both sides of the positive electrode current collector 14 and stacking the battery cells 10 .
- the plurality of battery cells 10 are laminated so as to be electrically connected in series by electrically connecting different polarities of adjacent battery cells 10 via current collectors.
- the positive electrode layer 11 is arranged on one main surface of at least one of the positive electrode collector 14 or the negative electrode collector 15, and the negative electrode layer 12 is arranged on the other main surface.
- FIG. 6 is a cross-sectional view showing the cross-sectional structure of the laminate 3a according to this embodiment.
- the laminate 3a may be cut in the first cutting step.
- the laminate 3 a includes a plurality of laminates 1 a each having a battery cell 10 and a conductive layer 31 .
- a plurality of laminates 1 a are laminated such that adjacent laminates 1 a are electrically connected via conductive layers 31 .
- the conductive layer 31 is located between adjacent laminates 1a among the plurality of laminates 1a.
- the positive electrode current collector 14 is arranged on one main surface of the conductive layer 31, and the negative electrode current collector 15 is arranged on the other main surface. That is, in the laminate 3a, the different polarities of adjacent battery cells 10 of the plurality of battery cells 10 are electrically connected via the positive electrode current collector 14, the negative electrode current collector 15, and the conductive layer 31. and stacked so as to be electrically connected in series. Therefore, the stacking order of the plurality of stacked bodies 1a is the same.
- the material of the conductive layer 31 is not particularly limited, and for example, a conductive adhesive having electrical conductivity and adhesiveness is used.
- a conductive adhesive for example, a mixture of metal particles and resin, a conductive polymer, or a low melting point metal can be used.
- the laminate 3a may not include the conductive layer 31, and the positive electrode current collector 14 and the negative electrode current collector 15 may be directly joined between the adjacent laminates 1a.
- the laminate 3a is formed by, for example, coating a conductive adhesive as a material for the conductive layer 31 on the positive electrode current collector 14 or the negative electrode current collector 15 of the laminate 1a formed by the above-described method, and laminating two layers. It is produced by bonding bodies 1a together via a conductive adhesive.
- the number of the plurality of laminates 1a is two, but may be three or more. By increasing the number of laminated bodies 1a and conductive layers 31 to be joined, the number of the plurality of laminated bodies 1a in the laminated body 3a can be adjusted.
- the plurality of battery cells 10 are electrically connected to the positive electrode current collector 14 or the negative electrode current collector 15 via the conductive layer 31 so that the same electrodes of the adjacent battery cells 10 are electrically connected to each other. , may be stacked so as to be electrically connected in parallel.
- a laminated battery having a structure in which a plurality of battery cells 10 are laminated is manufactured. can do.
- FIG. 7 is a cross-sectional view for explaining the manufacturing method of the battery according to this embodiment.
- the laminate 2a is cut at first cutting positions 211 and 211a indicated by dashed lines in the figure to form first cut surfaces.
- the cut laminate 2a is further cut at second cutting positions 221 and 221a shown by dashed lines in the drawing inside the first cutting plane to form second cutting planes.
- all of the plurality of battery cells 10 included in the stacked body 2a are collectively cut. It is as explained in.
- a lithium cobalt oxide powder as a positive electrode active material, a lithium sulfide-diphosphorus pentasulfide mixture as a solid electrolyte, and a xylene solvent are mixed to form a slurry, and the slurry is applied to an aluminum foil having a thickness of 12 ⁇ m as a positive electrode current collector.
- a positive electrode plate having a positive electrode layer was produced by drying after processing.
- the graphite powder as the negative electrode active material, the same solid electrolyte as above, and the xylene solvent are mixed to form a slurry, and the slurry is applied to a stainless steel foil having a thickness of 15 ⁇ m as the negative electrode current collector and then dried to form a negative electrode.
- a negative electrode plate having a layer was prepared.
- the same solid electrolyte and xylene solvent as above were mixed to form a slurry, and the slurry was applied onto the negative electrode layer and then dried to prepare a solid electrolyte layer.
- the positive electrode plate and the negative electrode plate were laminated so as to sandwich the solid electrolyte layer on the negative electrode layer, and pressure was applied under heating conditions of 120° C. to produce a laminate.
- the thickness of the laminate at this time was 150 ⁇ m.
- the thickness of the solid electrolyte layer was 30 ⁇ m.
- the produced laminate was cut with a shear to form a first cut surface.
- the surface roughness Rz1 of the first cut surface was measured using a laser microscope (manufactured by Keyence Corporation).
- the surface roughness Rz1 of the formed first cut surface was 84 ⁇ m.
- the laminate having the first cut surface is cut in a direction perpendicular to the first cut surface, divided into 15 pieces, and 15 about 15 mm squares each having the divided first cut surface are evaluated.
- a laminate for use was obtained.
- Example 1 Next, at a second cutting position 100 ⁇ m inside from the first cutting surface, the laminate for evaluation is cut using an ultrasonic cutter to form a second cutting surface, and the battery in which the second cutting surface is formed got That is, the second cutting step was performed under the condition that the distance W between the first cut surface and the second cut surface to be formed was 100 ⁇ m. The same operation was repeated 3 times using different laminates for evaluation to prepare 3 batteries.
- the surface roughness Rz2 of the second cut surface of the produced battery was measured using a laser microscope (manufactured by Keyence Corporation). Further, whether or not the battery was short-circuited was evaluated by measuring the potential difference between the positive electrode layer and the negative electrode layer of the manufactured battery with a tester.
- Table 1 shows the measurement results of the surface roughness Rz2 of the second cut surface and the short-circuit evaluation results.
- the surface roughness Rz2 of the second cut surface in Table 1 is the average value of three batteries.
- the number of short circuits in Table 1 is the number of batteries confirmed to have short circuits among the three batteries.
- Table 1 also shows the surface roughness Rz 1 of the first cut surface, the distance W, W/Rz 1 , and W/T where T is the thickness of the laminate for evaluation.
- the surface roughness Rz2 of the second cut surface was 9 ⁇ m, and the number of short circuits was zero.
- Example 2 A battery was produced in the same manner as in Example 1, except that the distance W was changed to 200 ⁇ m.
- the surface roughness Rz2 of the second cut surface of the battery produced in the same manner as in Example 1 was measured and the short circuit was evaluated.
- Table 1 shows the measurement results of the surface roughness Rz2 of the second cut surface and the short-circuit evaluation results. As shown in Table 1, in the battery of Example 2 , the surface roughness Rz2 of the second cut surface was 6 ⁇ m, and the number of short circuits was zero.
- Example 3 A battery was produced in the same manner as in Example 1, except that the distance W was changed to 300 ⁇ m.
- the surface roughness Rz2 of the second cut surface of the battery produced in the same manner as in Example 1 was measured and the short circuit was evaluated.
- Table 1 shows the measurement results of the surface roughness Rz2 of the second cut surface and the short-circuit evaluation results. As shown in Table 1, in the battery of Example 3, the surface roughness Rz2 of the second cut surface was 10 ⁇ m, and the number of short circuits was zero.
- Example 4 A battery was produced in the same manner as in Example 1, except that the distance W was changed to 400 ⁇ m.
- the surface roughness Rz2 of the second cut surface of the battery produced in the same manner as in Example 1 was measured and the short circuit was evaluated.
- Table 1 shows the measurement results of the surface roughness Rz2 of the second cut surface and the short-circuit evaluation results. As shown in Table 1, in the battery of Example 4, the surface roughness Rz2 of the second cut surface was 18 ⁇ m, and the number of short circuits was zero.
- Example 1 A battery was produced in the same manner as in Example 1, except that the distance W was changed to 500 ⁇ m. In addition, the surface roughness Rz2 of the second cut surface of the battery produced in the same manner as in Example 1 was measured and the short circuit was evaluated. Table 1 shows the measurement results of the surface roughness Rz2 of the second cut surface and the short-circuit evaluation results. As shown in Table 1, in the battery of Comparative Example 1, the surface roughness Rz2 of the second cut surface was 55 ⁇ m, and the number of short circuits was two.
- the batteries in Examples 1 to 4 in which the second cut surface was formed under the condition that W/Rz 1 was greater than 1 and less than 5, that is, Rz 1 ⁇ W ⁇ 5Rz 1 , were subjected to the second cut. Since the surface roughness Rz2 of the surface was small and was equal to or less than the thickness of the solid electrolyte layer and no short circuit occurred, it was found that high reliability could be achieved. Also, in this case, the distance W is three times or less the thickness T of the laminate for evaluation.
- the surface of the second cut surface Since the roughness Rz2 is 10 ⁇ m or less and the substantially flat second cut surface is formed, it was found that particularly high reliability can be achieved. Also, in this case, the distance W is less than or equal to twice the thickness T of the laminate for evaluation.
- a battery according to the present disclosure can be used, for example, as a battery for electronic equipment, electric appliances, electric vehicles, and the like.
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Abstract
Description
本開示の一態様に係る電池の製造方法は、正極層と、負極層と、前記正極層と前記負極層との間に位置する固体電解質層と、を有する少なくとも1つの電池セルを備える積層体を第1切断位置で切断して第1切断面を形成する第1切断工程と、前記第1切断工程で切断された前記積層体を前記第1切断面よりも内側の第2切断位置で切断して第2切断面を形成する第2切断工程と、を含み、前記第2切断工程において、前記第1切断面と形成される前記第2切断面との間の距離をWとし、前記第1切断面の表面粗さをRz1とした場合に、Rz1<W<5Rz1を満たす。
[構成]
まず、実施の形態1に係る電池の構成について、図1Aおよび図1Bを用いて説明する。
次に、本実施の形態に係る電池1の製造方法について、図2A、図2B、図3および図4を用いて説明する。
次に、実施の形態2に係る電池の製造方法について説明する。実施の形態2では、実施の形態1に対し、積層体が有する電池セルの数が異なる。以下、相違点について説明を行い、共通点の説明を省略もしくは簡略化する。
以下、本開示の詳細を、実施例に基づき、具体的に説明する。なお、本開示は、以下の実施例によって何ら限定されるものではない。
正極活物質であるコバルト酸リチウム粉末、固体電解質である硫化リチウム-五硫化二リン混合体およびキシレン溶媒を混合してスラリー化し、正極集電体である厚さ12μmのアルミ箔に当該スラリーを塗工してから乾燥させて正極層を有する正極板を作製した。
次に、第1切断面から100μm内側の第2切断位置で、超音波カッターを用いて評価用積層体を切断することで、第2切断面を形成し、第2切断面が形成された電池を得た。つまり、第1切断面と形成される第2切断面との間の距離Wが100μmである条件で、上述の第2切断工程を実施した。それぞれ別の評価用積層体を用いて同様の操作を3回繰り返し、3個の電池を作製した。
距離Wを200μmに変えた以外は、実施例1と同様の方法で電池を作製した。また、実施例1と同様の方法で作製した電池の第2切断面の表面粗さRz2の測定および短絡の評価を行った。第2切断面の表面粗さRz2の測定結果および短絡の評価結果を表1に示す。表1に示されるように、実施例2における電池では、第2切断面の表面粗さRz2は6μmであり、短絡数は0個であった。
距離Wを300μmに変えた以外は、実施例1と同様の方法で電池を作製した。また、実施例1と同様の方法で作製した電池の第2切断面の表面粗さRz2の測定および短絡の評価を行った。第2切断面の表面粗さRz2の測定結果および短絡の評価結果を表1に示す。表1に示されるように、実施例3における電池では、第2切断面の表面粗さRz2は10μmであり、短絡数は0個であった。
距離Wを400μmに変えた以外は、実施例1と同様の方法で電池を作製した。また、実施例1と同様の方法で作製した電池の第2切断面の表面粗さRz2の測定および短絡の評価を行った。第2切断面の表面粗さRz2の測定結果および短絡の評価結果を表1に示す。表1に示されるように、実施例4における電池では、第2切断面の表面粗さRz2は18μmであり、短絡数は0個であった。
距離Wを500μmに変えた以外は、実施例1と同様の方法で電池を作製した。また、実施例1と同様の方法で作製した電池の第2切断面の表面粗さRz2の測定および短絡の評価を行った。第2切断面の表面粗さRz2の測定結果および短絡の評価結果を表1に示す。表1に示されるように、比較例1における電池では、第2切断面の表面粗さRz2は55μmであり、短絡数は2個であった。
以上のように、W/Rz1が1より大きく5より小さい、つまりRz1<W<5Rz1を満たす条件で第2切断面を形成した実施例1から実施例4における電池は、第2切断面の表面粗さRz2が小さく固体電解質層の厚さ以下であり、短絡も発生していないことから、高い信頼性を実現できることが分かった。また、この場合には、距離Wは、評価用積層体の厚さTの3倍以下である。
以上、本開示に係る電池および電池の製造方法について、実施の形態および実施例に基づいて説明したが、本開示は、これらの実施の形態および実施例に限定されるものではない。本開示の主旨を逸脱しない限り、当業者が思いつく各種変形を実施の形態に施したものや、実施の形態における一部の構成要素を組み合わせて構築される別の形態も、本開示の範囲に含まれる。
1a、1b、2a、3a 積層体
10 電池セル
11 正極層
12 負極層
13 固体電解質層
14 正極集電体
15 負極集電体
16、16a、16b、17、17a、17b 主面
110、110a 第1切断面
111、111a、211、211a 第1切断位置
120、120a 第2切断面
121、121a、221、221a 第2切断位置
31 導電層
C10 第1方向
C20、C21 第2方向
W、Wa 距離
Claims (11)
- 正極層と、負極層と、前記正極層と前記負極層との間に位置する固体電解質層と、を有する少なくとも1つの電池セルを備える積層体を第1切断位置で切断して第1切断面を形成する第1切断工程と、
前記第1切断工程で切断された前記積層体を前記第1切断面よりも内側の第2切断位置で切断して第2切断面を形成する第2切断工程と、を含み、
前記第2切断工程において、前記第1切断面と形成される前記第2切断面との間の距離をWとし、前記第1切断面の表面粗さをRz1とした場合に、Rz1<W<5Rz1を満たす、
電池の製造方法。 - 前記Wは、前記積層体の厚さの3倍以下である、
請求項1に記載の電池の製造方法。 - 前記第1切断工程と前記第2切断工程とは、一連の工程として連続的に実施する、
請求項1または2に記載の電池の製造方法。 - 前記積層体の位置を基準とした場合に、前記第1切断位置において前記積層体の切断が進行する第1方向と、前記第2切断位置において前記積層体の切断が進行する第2方向とは異なる、
請求項1から3のいずれか一項に記載の電池の製造方法。 - 前記第2方向は、前記第1方向に垂直な方向である、
請求項4に記載の電池の製造方法。 - 前記第2方向は、前記積層体の積層方向に垂直な方向である、
請求項4または5に記載の電池の製造方法。 - 前記少なくとも1つの電池セルは、複数の電池セルであり、
前記複数の電池セルは積層されている、
請求項1から6のいずれか一項に記載の電池の製造方法。 - 前記第1切断工程および前記第2切断工程それぞれにおいて、せん断加工により前記積層体を切断する、
請求項1から7のいずれか一項に記載の電池の製造方法。 - 前記第2切断工程において、超音波カッターにより前記積層体を切断する、
請求項1から8のいずれか一項に記載の電池の製造方法。 - 前記第2切断面の表面粗さは、前記固体電解質層の厚さ以下である、
請求項1から9のいずれか一項に記載の電池の製造方法。 - 前記第2切断面は平坦である、
請求項1から10のいずれか一項に記載の電池の製造方法。
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JP2008159539A (ja) * | 2006-12-26 | 2008-07-10 | Toyota Motor Corp | 電極板及び電極板の製造方法、この電極板を用いた電池、この電池を搭載した車両、並びに、この電池を搭載した電池搭載機器 |
JP2015076315A (ja) | 2013-10-10 | 2015-04-20 | トヨタ自動車株式会社 | 全固体電池の製造方法 |
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JP2008159539A (ja) * | 2006-12-26 | 2008-07-10 | Toyota Motor Corp | 電極板及び電極板の製造方法、この電極板を用いた電池、この電池を搭載した車両、並びに、この電池を搭載した電池搭載機器 |
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JP2020013729A (ja) | 2018-07-19 | 2020-01-23 | トヨタ自動車株式会社 | 直列積層型全固体電池の製造方法 |
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