WO2015125487A1 - 蓄電素子及び蓄電素子の製造方法 - Google Patents
蓄電素子及び蓄電素子の製造方法 Download PDFInfo
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- WO2015125487A1 WO2015125487A1 PCT/JP2015/000825 JP2015000825W WO2015125487A1 WO 2015125487 A1 WO2015125487 A1 WO 2015125487A1 JP 2015000825 W JP2015000825 W JP 2015000825W WO 2015125487 A1 WO2015125487 A1 WO 2015125487A1
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- Prior art keywords
- packing
- plate
- current collector
- positive electrode
- space
- Prior art date
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- 238000003860 storage Methods 0.000 title claims abstract description 91
- 230000005611 electricity Effects 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 238000012856 packing Methods 0.000 claims description 420
- 238000000034 method Methods 0.000 claims description 31
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000012986 modification Methods 0.000 description 106
- 230000004048 modification Effects 0.000 description 106
- 238000005336 cracking Methods 0.000 description 15
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- 229910052751 metal Inorganic materials 0.000 description 5
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 239000004734 Polyphenylene sulfide Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 239000007773 negative electrode material Substances 0.000 description 4
- 229920000069 polyphenylene sulfide Polymers 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 239000007774 positive electrode material Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000008151 electrolyte solution Substances 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 239000011255 nonaqueous electrolyte Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
- H01G11/80—Gaskets; Sealings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/74—Terminals, e.g. extensions of current collectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
- H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
-
- 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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- 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
- H01M50/147—Lids or covers
-
- 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
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
-
- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
-
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
- 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
- Y02E60/13—Energy storage using capacitors
Definitions
- the present invention relates to an electricity storage device including an electrode terminal, a current collector electrically connected to the electrode terminal, and a container for housing the current collector, and a method for manufacturing the electricity storage device.
- an electric vehicle As a global environmental issue, the shift from gasoline cars to electric cars is becoming important. For this reason, development of an electric vehicle using a power storage element such as a lithium ion secondary battery as a power source is being promoted. And in such an electrical storage element, generally it is provided with the electrode terminal, the electrical power collector electrically connected to an electrode terminal, and the container which accommodates an electrical power collector, and an electrode terminal is provided in a container. The current collector is fixed.
- the conventional power storage element has a problem in that when the electrode terminal and the current collector are fixed to the container, the packing may be broken and damaged, so that the sealing property and the insulating property may not be secured.
- the present invention has been made to solve the above-described problem, and an electricity storage device and an electricity storage device capable of suppressing damage such as cracking of a packing disposed between a container and an electrode terminal or a current collector It aims at providing the manufacturing method of.
- a power storage device includes a container having a plate-like portion having an outer surface and an inner surface and having a hole formed therein, and an outer surface of the plate-like portion.
- An electrode terminal having a terminal main body portion, a current collector disposed on an inner surface of the plate-like portion, and an outer side of the terminal main-body portion and the plate-like portion when viewed in a normal direction of the plate-like portion.
- a fixing portion having a caulking portion in contact with the current collector, and the cylindrical portion includes an inner surface of the plate-like portion and the first portion.
- An extending portion extending from the contact surface with the packing toward the caulking portion, and the extending portion has an outer diameter at a tip closest to the caulking portion when viewed in the normal direction of the plate-like portion. It differs from the outer diameter of the base portion opposite to the tip portion, or is adjacent to the space formed between the second packing.
- a method for manufacturing a power storage device includes a container having a plate-like portion having an outer surface and an inner surface and having a hole, and a terminal disposed on the outer surface of the plate-like portion.
- An electrode terminal having a main body part, a current collector disposed on the inner surface of the plate-like part, and the terminal main body part and an outer surface of the plate-like part when viewed in the normal direction of the plate-like part
- a first packing having at least a portion thereof disposed between the first packing having a cylindrical portion inserted into the hole, and the plate-like portion as viewed in the normal direction of the plate-like portion
- a second packing at least a part of which is disposed between the inner surface of the current collector and the current collector, wherein the extending part of the cylindrical part is formed of the plate-like part.
- the electricity storage device and the manufacturing method thereof in the present invention it is possible to suppress damage such as cracking of the packing disposed between the container and the electrode terminal or the current collector.
- FIG. 1 is a perspective view schematically showing the external appearance of the energy storage device according to the embodiment of the present invention.
- FIG. 2 is a perspective view showing each component included in the power storage element by separating the main body of the container of the power storage element according to the embodiment of the present invention.
- FIG. 3 is a cross-sectional view showing a configuration in which the positive electrode terminal and the negative electrode terminal according to the embodiment of the present invention are fixed to the lid together with the positive electrode current collector and the negative electrode current collector.
- FIG. 4 is an exploded view showing each component when the configuration around the positive electrode terminal of the energy storage device according to the embodiment of the present invention is disassembled.
- FIG. 5 is a diagram showing the configuration of the first packing according to the embodiment of the present invention.
- FIG. 6 is a diagram showing the configuration of the second packing according to the embodiment of the present invention.
- FIG. 7 is a cross-sectional view illustrating a configuration in which the positive electrode terminal according to the embodiment of the present invention is fixed to the lid together with the positive electrode current collector.
- FIG. 8 is a cross-sectional view showing a configuration before the positive electrode terminal according to the embodiment of the present invention is fixed to the lid together with the positive electrode current collector.
- FIG. 9 is a cross-sectional view showing a process in which the positive terminal according to the embodiment of the present invention is fixed to the lid together with the positive current collector.
- FIG. 10 is a cross-sectional view showing a process in which the positive electrode terminal according to the first modification of the embodiment of the present invention is fixed to the lid together with the positive electrode current collector.
- FIG. 11 is a cross-sectional view illustrating a process in which the positive electrode terminal according to the second modification of the embodiment of the present invention is fixed to the lid together with the positive electrode current collector.
- FIG. 12 is a cross-sectional view illustrating a process in which the positive electrode terminal according to the third modification of the embodiment of the present invention is fixed to the lid together with the positive electrode current collector.
- FIG. 13 is sectional drawing which shows the process in which the positive electrode terminal which concerns on the modification 4 of embodiment of this invention is fixed to a cover body with a positive electrode electrical power collector.
- FIG. 14 is a cross-sectional view illustrating a process in which the positive electrode terminal according to the fifth modification of the embodiment of the present invention is fixed to the lid together with the positive electrode current collector.
- FIG. 15 is a cross-sectional view showing a configuration in which the positive electrode terminal according to Modification 6 of the embodiment of the present invention is fixed to the lid together with the positive electrode current collector.
- FIG. 16 is a diagram showing a configuration of the second packing according to the sixth modification of the embodiment of the present invention.
- FIG. 17 is a cross-sectional view showing a configuration in which a positive electrode terminal according to Modification 7 of the embodiment of the present invention is fixed to a lid together with a positive electrode current collector.
- FIG. 18 is a cross-sectional view showing a configuration in which the positive electrode terminal according to Modification 8 of the embodiment of the present invention is fixed to the lid together with the positive electrode current collector.
- FIG. 19 is a cross-sectional view illustrating a configuration in which a positive electrode terminal according to Modification 9 of the embodiment of the present invention is fixed to a lid together with a positive electrode current collector.
- FIG. 20 is a cross-sectional view illustrating a configuration in which the positive electrode terminal according to Modification 10 of the embodiment of the present invention is fixed to the lid together with the positive electrode current collector.
- FIG. 21 is a cross-sectional view showing a configuration in which the positive electrode terminal according to the eleventh modification of the embodiment of the present invention is fixed to the lid together with the positive electrode current collector.
- FIG. 22 is a cross-sectional view showing a configuration in which the positive electrode terminal according to Modification 12 of the embodiment of the present invention is fixed to the lid together with the positive electrode current collector.
- the present invention has been made to solve the above-described problem, and an electricity storage device and an electricity storage device capable of suppressing damage such as cracking of a packing disposed between a container and an electrode terminal or a current collector It aims at providing the manufacturing method of.
- a power storage device includes a container having a plate-like portion having an outer surface and an inner surface and having a hole formed therein, and an outer surface of the plate-like portion.
- An electrode terminal having a terminal main body portion, a current collector disposed on an inner surface of the plate-like portion, and an outer side of the terminal main-body portion and the plate-like portion when viewed in a normal direction of the plate-like portion.
- a fixing portion having a caulking portion in contact with the current collector, and the cylindrical portion includes an inner surface of the plate-like portion and the first portion.
- An extending portion extending from the contact surface with the packing toward the caulking portion, and the extending portion has an outer diameter at a tip closest to the caulking portion when viewed in the normal direction of the plate-like portion. It differs from the outer diameter of the base portion opposite to the tip portion, or is adjacent to the space formed between the second packing.
- the cylindrical part of the first packing has an extending part extending from the contact surface between the container and the second packing toward the caulking part, and the extending part is a tip part on the caulking part side.
- the outer diameter is different from the outer diameter of the root portion, or is adjacent to the space between the second packing.
- a power storage device includes a container having a plate-like portion having an outer surface and an inner surface and having a hole, and an outer portion of the plate-like portion.
- An electrode terminal having a terminal body portion disposed on the surface, a current collector disposed on an inner surface of the plate-like portion, and the terminal body portion and the plate-like shape when viewed in the normal direction of the plate-like portion.
- a first packing at least a part of which is disposed between the outer surface of the plate portion and the normal direction of the plate portion, and at least between the inner surface of the plate portion and the current collector.
- a second packing in which a part thereof is disposed the second packing having a cylindrical portion inserted into the hole portion, a column portion inserted into the cylindrical portion, and an end portion of the column portion And a fixing portion having a caulking portion that is formed and in contact with the terminal main body portion, and the cylindrical portion is provided outside the plate-like portion.
- a extending portion extending from the contact surface between the surface and the first packing toward the caulking portion, and the extending portion is a tip portion closest to the caulking portion when viewed in the normal direction of the plate-like portion Is different from the outer diameter of the base portion opposite to the tip portion, or is adjacent to the space formed between the first packing.
- the cylindrical part of the second packing has an extending part extending from the contact surface between the container and the first packing toward the caulking part, and the extending part is a tip part on the caulking part side.
- the outer diameter is different from the outer diameter of the root portion or adjacent to the space between the first packing.
- extension portion may have an outer diameter of the tip portion larger than an outer diameter of the root portion when viewed in the normal direction of the plate-like portion.
- the end portion on the caulking portion side of the column portion is expanded outward.
- the outer diameter of the tip part of the extension part has a shape larger than the outer diameter of the root part, the spread of the end part of the fixed part can be absorbed, so that the packing is broken and damaged. Can be suppressed.
- At least one of the extension part and the second packing has a thin part thinner than the other part, and the space is formed at a position adjacent to the thin part. It may be.
- the space is formed adjacent to at least one thin part of the extension part and the second packing, even if the packing is strongly pressed by caulking, the escape place of the packing can be secured. It can. Thereby, it can suppress that a packing arrange
- an opening into which the cylindrical portion is inserted may be formed in the second packing, and an inner peripheral surface of the opening may partially form the space.
- the space which becomes the escape place when the packing is strongly pressed can be formed on the inner peripheral surface of the opening of the second packing, the space can be easily formed.
- cylindrical portion may be formed separately from the first packing.
- a method for manufacturing a power storage device includes a container having a plate-like portion having an outer surface and an inner surface and having a hole, and the plate-like portion.
- An electrode terminal having a terminal body portion disposed on the outer surface of the plate, a current collector disposed on an inner surface of the plate-shaped portion, and the terminal body portion and the A first packing at least part of which is disposed between the outer surface of the plate-like portion, the first packing having a cylindrical portion inserted into the hole, and a normal direction of the plate-like portion
- a method of manufacturing an electricity storage device comprising a second packing at least a part of which is disposed between the inner surface of the plate-like portion and the current collector, and extending the cylindrical portion The part protrudes from the contact surface between the inner surface of the plate-like part and the second packing toward the caulking part.
- an electrical storage element is manufactured by arrange
- the first packing and the second packing may be arranged so that the space is defined by at least the second packing and the current collector.
- the first packing and the second packing are arranged so that the space is widened from the plate-like part side to the current collector side when viewed in the normal direction of the plate-like part. You may decide.
- the first packing and the second packing are arranged so that the space is widened from the plate-like portion side to the current collector side, the spread of the end portion of the fixed portion can be further absorbed. It is possible to further suppress damage such as cracking.
- a method for manufacturing a power storage device includes a container having a plate-like portion having an outer surface and an inner surface and having a hole, and the plate-like shape.
- An electrode terminal having a terminal body portion disposed on the outer surface of the portion, a current collector disposed on the inner surface of the plate-shaped portion, and the terminal body portion as viewed in the normal direction of the plate-shaped portion;
- a first packing at least a part of which is disposed between the outer surface of the plate-like part, and the inner surface of the plate-like part and the current collector as viewed in the normal direction of the plate-like part
- a second packing having at least a part thereof disposed between the second packing and the second packing having a cylindrical portion inserted into the hole.
- the protruding portion protrudes from the contact surface between the outer surface of the plate-like portion and the first packing toward the caulking portion.
- the first portion is defined such that a space is defined by at least any two of the extension portion, the first packing, the terminal main body portion, the inner surface of the plate-like portion, and the pillar portion. Arrangement step of arranging the packing and the second packing, and inserting the column portion of the fixed portion into the cylindrical portion and caulking the end portion of the fixed portion, thereby forming a caulked portion that contacts the terminal main body portion A caulking process.
- the first packing and the second packing may be arranged so that the space is defined by at least the first packing and the terminal main body.
- the first packing and the second packing are arranged so that the space is widened from the plate-like part side to the terminal body part side when viewed in the normal direction of the plate-like part. You may decide to do it.
- FIG. 1 is a perspective view schematically showing an external appearance of a power storage device 10 according to an embodiment of the present invention.
- FIG. 2 is a perspective view showing each component included in power storage element 10 by separating main body 111 of container 100 of power storage element 10 according to the embodiment of the present invention.
- the Z-axis direction is shown as the vertical direction, and the Z-axis direction will be described below as the vertical direction. However, depending on the usage, the Z-axis direction may not be the vertical direction.
- the axial direction is not limited to the vertical direction. The same applies to the following drawings.
- the electricity storage element 10 is a secondary battery that can charge and discharge electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery.
- the electrical storage element 10 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it.
- the electricity storage device 10 includes a container 100, a positive electrode terminal 200, and a negative electrode terminal 300.
- a positive electrode current collector 120, a negative electrode current collector 130, and an electrode body 140 are accommodated inside the container 100.
- a liquid such as an electrolytic solution (nonaqueous electrolytic solution) is sealed inside the container 100 of the electricity storage element 10, the liquid is not shown.
- an electrolytic solution nonaqueous electrolytic solution
- the container 100 includes a main body 111 having a rectangular cylindrical shape and a bottom, and a lid 110 that is a plate-like member that closes the opening of the main body 111.
- the container 100 can be sealed by welding the lid 110 and the main body 111 after the positive electrode current collector 120, the negative electrode current collector 130, the electrode body 140, and the like are accommodated therein. It has become a thing.
- the material of the lid 110 and the main body 111 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, aluminum alloy, iron, plated steel plate, for example.
- the electrode body 140 includes a positive electrode, a negative electrode, and a separator, and is a member that can store electricity.
- a positive electrode active material layer is formed on a positive electrode base material foil which is a long strip-shaped metal foil made of aluminum or an aluminum alloy.
- the negative electrode is obtained by forming a negative electrode active material layer on a negative electrode substrate foil, which is a long strip-shaped metal foil made of copper, a copper alloy, or the like.
- the separator is a microporous sheet made of resin.
- the positive electrode active material used for the positive electrode active material layer or the negative electrode active material used for the negative electrode active material layer may be a known material as long as it is a positive electrode active material or a negative electrode active material capable of occluding and releasing lithium ions. Can be used.
- the electrode body 140 is formed by winding a layered arrangement so that a separator is sandwiched between the negative electrode and the positive electrode, and is electrically connected to the positive electrode current collector 120 and the negative electrode current collector 130.
- a separator is sandwiched between the negative electrode and the positive electrode, and is electrically connected to the positive electrode current collector 120 and the negative electrode current collector 130.
- the ellipse shape was shown as a shape of the electrode body 140, circular shape or elliptical shape may be sufficient.
- the shape of the electrode body 140 is not limited to the wound type, and may be a laminated type in which flat plate plates are laminated.
- the positive electrode terminal 200 is an electrode terminal electrically connected to the positive electrode of the electrode body 140
- the negative electrode terminal 300 is an electrode terminal electrically connected to the negative electrode of the electrode body 140.
- the positive electrode terminal 200 and the negative electrode terminal 300 lead the electricity stored in the electrode body 140 to the external space of the power storage element 10, and in order to store the electricity in the electrode body 140, It is a conductive electrode terminal for introducing.
- the positive electrode terminal 200 and the negative electrode terminal 300 are attached to the lid body 110 disposed above the electrode body 140. Specifically, the positive electrode terminal 200 is fixed to the lid 110 together with the positive electrode current collector 120 by caulking with a rivet or the like. Similarly, the negative electrode terminal 300 is fixed to the lid 110 together with the negative electrode current collector 130 by caulking with a rivet. A detailed configuration in which the positive electrode terminal 200 and the negative electrode terminal 300 are fixed to the lid 110 together with the positive electrode current collector 120 and the negative electrode current collector 130 will be described later.
- the positive electrode current collector 120 is disposed between the positive electrode of the electrode body 140 and the side wall of the main body 111 of the container 100, and has electrical conductivity and rigidity that are electrically connected to the positive electrode terminal 200 and the positive electrode of the electrode body 140. It is a member provided.
- the positive electrode current collector 120 is formed of aluminum, an aluminum alloy, or the like, like the positive electrode base material foil of the electrode body 140.
- the negative electrode current collector 130 is disposed between the negative electrode of the electrode body 140 and the side wall of the main body 111 of the container 100, and has electrical conductivity and rigidity electrically connected to the negative electrode terminal 300 and the negative electrode of the electrode body 140. It is a member provided.
- the negative electrode current collector 130 is formed of copper, a copper alloy, or the like, like the negative electrode base material foil of the electrode body 140.
- FIG. 3 is a cross-sectional view illustrating a configuration in which the positive electrode terminal 200 and the negative electrode terminal 300 according to the embodiment of the present invention are fixed to the lid body 110 together with the positive electrode current collector 120 and the negative electrode current collector 130.
- FIG. 2 shows a configuration around the positive electrode terminal 200 and the negative electrode terminal 300 when the electricity storage device 10 shown in FIG. 2 is cut along a plane parallel to the XZ plane including the III-III line. It is sectional drawing.
- the power storage element 10 further includes a first packing 220 and a second packing 230 on the positive electrode terminal 200 and positive electrode current collector 120 side, and the positive electrode terminal 200 includes a terminal body. It has a part 201 and a fixed part 210.
- the negative electrode terminal 300 and the negative electrode current collector 130 side further include a first packing 320 and a second packing 330, and the negative electrode terminal 300 includes a terminal main body portion 301, a fixing portion 310, and the like. have.
- the first packings 220 and 320 are packings disposed between the electrode terminals and the container 100. That is, the first packings 220 and 320 are, as viewed in the normal direction (Z-axis direction) of the lid body 110, the terminal main body portions 201 and 301 and the outer surface 110a of the lid body 110 (the surface on the plus side of the Z-axis direction). It is a packing in which at least a part thereof is disposed between the two. Specifically, the first packing 220 is disposed between the positive electrode terminal 200 and the lid body 110 of the container 100, and the first packing 320 is disposed between the negative electrode terminal 300 and the lid body 110.
- the first packings 220 and 320 are preferably formed of an insulating member, for example, a resin such as polyphenylene sulfide (PPS) or polypropylene (PP).
- the second packings 230 and 330 are packings disposed between the current collector and the container 100. That is, the second packings 230 and 330 are packings in which at least a part thereof is disposed between the inner surface 110b of the lid 110 and the current collector when viewed in the normal direction of the lid 110. Specifically, the second packing 230 is disposed between the terminal-side connecting portion 121 of the positive electrode current collector 120 and the lid 110 of the container 100, and the second packing 330 is disposed on the terminal side of the negative electrode current collector 130. It is disposed between the connection part 131 and the lid 110.
- the second packings 230 and 330 are preferably formed of an insulating member, for example, a resin such as polyphenylene sulfide (PPS) or polypropylene (PP).
- the positive electrode current collector 120 is disposed on the inner surface 110 b (the surface on the negative side in the Z-axis direction) of the lid 110, and has a plate-like terminal side connection part 121 connected to the positive electrode terminal 200, and an electrode body. 140 has an electrode body connecting portion 122 which is two long legs joined to one end of 140.
- the negative electrode current collector 130 is disposed on the inner surface 110b (the surface on the negative side in the Z-axis direction) of the lid 110, and includes a flat terminal-side connection part 131 connected to the negative electrode terminal 300, an electrode It has the electrode body connection part 132 which is two elongate legs joined to the other end of the body 140.
- Terminal body parts 201 and 301 are body parts of electrode terminals arranged on the outer surface 110a of the lid 110 of the container 100.
- the terminal main body portion 201 is a main body portion of the positive electrode terminal 200, and is disposed on the outer side (above, the Z axis direction plus side) of the lid 110 of the container 100.
- the terminal main body 301 is a main body portion of the negative electrode terminal 300 and is disposed on the outer side (above, the Z axis direction plus side) of the lid 110.
- the terminal body parts 201 and 301 are formed of a conductive member such as metal.
- the fixing portions 210 and 310 are portions for fixing the terminal main body portions 201 and 301 and the current collector to the container 100. Specifically, the fixing part 210 fixes the terminal main body part 201 and the terminal side connection part 121 of the positive electrode current collector 120 to the lid body 110 of the container 100. The fixing unit 310 fixes the terminal body 301 and the terminal-side connection part 131 of the negative electrode current collector 130 to the lid 110.
- the fixing portions 210 and 310 are formed of a conductive member such as a metal.
- the fixing portions 210 and 310 are rivets (hollow rivets).
- the fixing portions 210 and 310 are hollow as long as they can fix the terminal body portions 201 and 301 and the current collector to the container 100. It is not limited to rivets or solid rivets.
- the fixing units 210 and 310 may have a configuration in which the fixing is performed by bolting or screwing, a configuration in which the fixing is performed by welding, or the like.
- terminal body 201 and the fixing part 210 may be formed integrally.
- terminal main body portion 301 and the fixing portion 310 may be integrally formed. That is, the positive electrode terminal 200 may be formed as one member, and the negative electrode terminal 300 may be formed as one member.
- FIG. 4 is an exploded view showing each component when the configuration around the positive electrode terminal 200 of the electricity storage device 10 according to the embodiment of the present invention is disassembled.
- (a) of the figure is a cross-sectional view (figure of each component before assembly) when the components around the positive electrode terminal 200 shown in FIG. 3 are separated.
- (B) of FIG. 6 is a plan view when the respective constituent elements are viewed from above (Z-axis direction plus side).
- the fixing portion 210 is a cylindrical member having a hollow lower portion (portion on the minus side in the Z-axis direction). Specifically, the fixing portion 210 has an upper surface portion 211 and a column portion 212, and a space 213 is formed inside the column portion 212.
- the upper surface portion 211 is a disk-shaped portion and is fitted into a concave portion 202 of the terminal main body portion 201 described later.
- the column part 212 is a columnar part (lower part is cylindrical) protruding downward from the upper surface part 211 (minus side in the Z-axis direction).
- the terminal body 201 is a rectangular and flat plate-like member, and has a concave portion 202 and a terminal opening 203 that are circular when viewed from above. That is, the terminal opening 203 is a through-hole having a circular cross section formed in the terminal main body portion 201, and the concave portion 202 is a concave shape formed around the terminal opening 203 so as to surround the terminal opening 203. It is a part (dent) of.
- the cross-sectional shape of the terminal opening 203 is not limited to a circular shape, and may be an elliptical shape or a rectangular shape.
- the terminal opening 203 is not limited to a through-hole, and is a semicircular shape. Alternatively, it may be a notch cut into a rectangular shape.
- the first packing 220 is a rectangular and flat member in which an opening is formed. Below, the structure of the 1st packing 220 is demonstrated in detail.
- FIG. 5 is a diagram showing a configuration of the first packing 220 according to the embodiment of the present invention. Specifically, (a) of the figure is a cross-sectional view (the figure before assembly) of the first packing 220 shown in FIG. 4, and (b) of the figure shows the first packing 220 upward. It is a top view at the time of seeing from (Z-axis direction plus side).
- the first packing 220 includes a flat plate portion 221, a projecting portion 222 protruding upward from the flat plate portion 221 (Z-axis direction plus side), and downward from the flat plate portion 221 (Z-axis direction negative side). And a cylindrical portion 223 protruding in the direction.
- the flat plate portion 221 is a rectangular and flat plate portion, and is disposed between the terminal main body portion 201 of the positive electrode terminal 200 and the terminal side connection portion 121 of the positive electrode current collector 120.
- the protruding portion 222 is an annular portion protruding upward from the outer edge of the flat plate portion 221, and has a square tube shape. Further, the first packing 220 is formed with a recess surrounded by the protrusion 222, and the terminal body 201 of the positive electrode terminal 200 is disposed in the recess.
- the flat plate portion 221 has an opening having a circular cross section, and the tubular portion 223 is an annular portion protruding downward from the edge of the opening, and has a cylindrical shape. Yes.
- the cylindrical portion 223 is disposed outside (around) the fixing portion 210 of the positive electrode terminal 200 and inside the opening of the container 100. In other words, the column portion 212 of the fixing portion 210 is inserted into the cylindrical portion 223, and the cylindrical portion 223 is inserted into the lid hole portion 112 of the lid 110 described later.
- a through-hole is formed in the first packing 220 by the cylindrical portion 223, and a recess is formed around the through-hole by the protruding portion 222.
- the cross-sectional shape of the opening part of the flat plate part 221 is not limited to a circular shape, and may be an elliptical shape or a rectangular shape. That is, the cylindrical part 223 is not limited to a cylindrical shape, and may be an elliptical cylindrical shape or a rectangular cylindrical shape.
- first connection portion 224 as an extending portion extending toward a caulking portion 214 described later is disposed at the tip portion of the cylindrical portion 223.
- the first connection part 224 is a part connected to the second packing 230. Details of the first connection portion 224 will be described later.
- the lid body 110 is a rectangular and flat plate portion, and has a lid body hole portion 112 having a circular cross section. That is, the lid body 110 has an outer surface 110a (a surface on the plus side in the Z-axis direction) and an inner surface 110b (a surface on the minus side in the Z-axis direction), and a plate in which the lid hole portion 112 that is a through hole is formed. It is a shape part. Further, the column part 212 of the fixing part 210 of the positive electrode terminal 200 and the cylindrical part 223 of the first packing 220 are inserted into the lid hole part 112.
- the cross-sectional shape of the lid hole portion 112 is not limited to a circular shape, and may be an elliptical shape or a rectangular shape.
- the lid hole portion 112 is not limited to a through-hole, It may be a notch cut into a circular shape or a rectangular shape.
- the second packing 230 is a rectangular and flat member in which an opening is formed. Below, the structure of the 2nd packing 230 is demonstrated in detail.
- FIG. 6 is a diagram showing a configuration of the second packing 230 according to the embodiment of the present invention. Specifically, (a) in the figure is a cross-sectional view (the figure before assembly) of the second packing 230 shown in FIG. 4, and (b) in the figure shows the second packing 230 upward. It is a top view at the time of seeing from (Z-axis direction plus side).
- the second packing 230 has a rectangular and flat plate portion 231 and a second connection portion 232 disposed inside the flat plate portion 231.
- the second connection part 232 is a part connected to the first connection part 224 of the first packing 220 and has a through hole 235.
- the through hole 235 is a circular hole portion in which the fixing portion 210 of the positive electrode terminal 200 is disposed inward. That is, the column part 212 of the fixing part 210 is inserted into the through hole 235.
- the second connection portion 232 has a cylindrical shape at the top, and the inner diameter gradually increases downward from the lower end (end on the negative side in the Z-axis direction) of the cylindrical shape. That is, the second connection part 232 has an inclined surface whose inner surface gradually expands downward.
- the through hole 235 is an opening having an upper part in a columnar shape and a central part and a lower part having a truncated cone shape. In other words, the second connection portion 232 has a thin portion that gradually becomes thinner toward the through hole 235.
- the cross-sectional shape of the through hole 235 is not limited to a circular shape, and may be an elliptical shape, a rectangular shape, or the like.
- the positive electrode current collector 120 has the terminal-side connection portion 121 and the two electrode body connection portions 122 as described above, and the current collector opening portion 123 is formed in the terminal-side connection portion 121.
- the current collector opening 123 is a through hole having a circular cross section, and the column portion 212 of the fixing portion 210 of the positive electrode terminal 200 is inserted therein.
- the cross-sectional shape of the current collector opening 123 is not limited to a circular shape, and may be an elliptical shape or a rectangular shape.
- the current collector opening 123 is not limited to a through hole. Alternatively, it may be a semicircular or rectangular cutout.
- FIG. 7 is a cross-sectional view showing a configuration in which the positive electrode terminal 200 according to the embodiment of the present invention is fixed to the lid 110 together with the positive electrode current collector 120.
- FIG. 3 is an enlarged cross-sectional view showing an enlarged configuration around the positive electrode terminal 200 shown in FIG.
- the fixing part 210 of the positive electrode terminal 200 has a first packing 220 and a second packing 230 arranged between the terminal body 201 of the positive electrode terminal 200 and the positive electrode current collector 120, and the terminal
- the terminal main body 201 and the positive electrode current collector 120 are fixed to the container 100 by sandwiching the main body 201 and the positive electrode current collector 120.
- the terminal main body portion 201 and the positive electrode current collector 120 are caulked by, for example, rivets as the fixing portion 210 in a state where the first packing 220 and the second packing 230 are sandwiched, and are attached to the lid 110 of the container 100. It is fixed. Note that the fixing portion 210 is pressed by caulking so that the lower end portion of the column portion 212 spreads outward, so that the caulking portion 214 is formed.
- the caulking portion 214 is disposed at an end portion of the fixed portion 210 on the positive electrode current collector 120 side (Z-axis direction negative side). That is, the caulking portion 214 is a portion formed by caulking the end portion of the fixing portion 210 on the positive electrode current collector 120 side, that is, a portion formed at the end portion of the column portion 212 and in contact with the positive electrode current collector 120. It is. Specifically, the caulking portion 214 is an annular portion that protrudes from the terminal-side connection portion 121 of the positive electrode current collector 120 toward the inside of the container 100 and protrudes radially outward from the column portion 212. is there. In addition, the space 213 of the fixing portion 210 is formed so as to expand toward the caulking portion 214 side.
- a second packing 230 is disposed between the caulking portion 214 and the lid body 110. That is, the second packing 230 is a packing disposed on the caulking portion 214 side, and the first packing 220 is a packing disposed on the side opposite to the caulking portion 214.
- the cylindrical portion 223 of the first packing 220 is disposed outside the column portion 212 and protrudes toward the caulking portion 214 from the surface 236 of the second packing 230 on the lid 110 side.
- the cylindrical portion 223 is disposed so as to protrude until the first connection portion 224 contacts the terminal side connection portion 121 of the positive electrode current collector 120. That is, the first connection part 224 is an extension part extending from the contact surface between the inner surface 110 b of the lid body 110 and the second packing 230 toward the caulking part 214.
- the 1st connection part 224 will be arrange
- the boundary 226 between the first connection part 224 and the second connection part 232 is formed by the contact between the first connection part 224 and the second connection part 232.
- the boundary 226 has a shape like a side surface of a substantially truncated cone that widens from the lid 110 side toward the caulking portion 214 side.
- the cylindrical portion 223 has a distance from the column portion 212 at the boundary 226 with the second packing 230 such that the end on the lid 110 side (end P1 in the figure) and the end on the caulking portion 214 side (the same) It is formed differently from the end portion P2) in the figure.
- the distance between the end portion P2 on the caulking portion 214 side and the column portion 212 at the boundary 226 is the end portion P1 on the lid 110 side and the column portion 212.
- the first connecting portion 224 as the extending portion of the tubular portion 223 is seen in the normal direction (Z-axis direction) of the lid body 110 and has an outer diameter (first diameter) closest to the caulking portion 214.
- the distance between the central axis of the connection portion 224 and the end portion P2 is different from the outer diameter of the base portion opposite to the tip portion (distance between the central axis and the end portion P1). That is, in the first connection portion 224, the outer diameter of the tip portion is larger than the outer diameter of the root portion when viewed in the normal direction of the lid 110.
- FIG. 8 is a cross-sectional view showing a configuration before the positive electrode terminal 200 according to the embodiment of the present invention is fixed to the lid 110 together with the positive electrode current collector 120. Specifically, this figure shows a state before the positive electrode terminal 200 shown in FIG. 7 is fixed to the lid body 110 together with the positive electrode current collector 120, that is, before the caulking portion 214 is formed (caulking). It is sectional drawing which shows the state of before.
- FIG. 9 is a cross-sectional view showing a process in which the positive terminal 200 according to the embodiment of the present invention is fixed to the lid 110 together with the positive current collector 120. Specifically, this figure is a cross-sectional view showing a process (caulking process) in which the caulking part 214 of the fixing part 210 is formed.
- the cylindrical portion 223 of the first packing 220 is arranged outside the column portion 212 of the fixing portion 210 and inside the lid hole portion 112 of the lid 110. . Further, the cylindrical portion 223 protrudes from the surface 236 on the container 100 side of the second packing 230 toward one end side (Z-axis direction negative side) of the fixing portion 210, and the cylindrical portion 223, the second packing 230, It arrange
- the first connection portion 224 of the cylindrical portion 223 protrudes from the contact surface between the inner surface 110b of the lid 110 and the second packing 230 toward the caulking portion 214, and the first connection portion.
- the second packing 230, the positive electrode current collector 120, the inner surface 110b of the lid body 110, and the column part 212, the first packing 220 and the second packing are so defined that at least any two of them are defined.
- 230 is arranged.
- the space 240 is a space defined by the cylindrical portion 223, the second packing 230, and the terminal side connection portion 121 of the positive electrode current collector 120.
- the first packing 220 and the second packing 230 are formed in the shape shown in FIGS. 5 and 6 and arranged.
- the first packing is formed so that the space 240 is defined by at least the second packing 230 and the positive electrode current collector 120 (so that the space 240 is formed closer to the positive electrode current collector 120 than the lid 110).
- 220 and the second packing 230 are arranged.
- the space 240 is formed so as to expand from the lid 110 side to the positive electrode current collector 120 side when viewed in the normal direction of the lid 110 (the closer to the positive electrode current collector 120 than the lid 110 is formed.
- the first packing 220 and the second packing 230 are arranged.
- the through-hole 235 formed in the second connection portion 232 of the second packing 230 has a shape that gradually expands downward, the first connection portion 224 of the cylindrical portion 223 is passed through the through-hole 235.
- the space 240 is formed around the first connection part 224 by being disposed inside.
- the column portion 212 of the fixing portion 210 is inserted into the cylindrical portion 223, and one end portion (end portion on the negative side in the Z-axis direction) of the fixing portion 210 is caulked. Then, a caulking portion 214 that is in contact with the positive electrode current collector 120 is formed.
- the first connecting portion 224 has the outer diameter of the tip portion closest to the caulking portion 214 as viewed in the normal direction of the lid 110 and the outer diameter of the root portion opposite to the tip portion. To be different.
- the caulking portion 214 side of the space 213 in the fixing portion 210 is widened by caulking, so that the caulking portion 214 side of the column portion 212 spreads outward, and the cylindrical portion 223 is pressed against the column portion 212 from the inside.
- the airtightness is improved.
- the first connection portion 224 is pressed from the inside, and the first packing 220 and the second packing 230 are also pressed in the axial direction (Z-axis direction) of the column portion 212 by caulking.
- the packing is compressed and the space 240 is closed. Thereby, a boundary 226 between the first packing 220 and the second packing 230 is formed.
- the first connection portion 224 has an outer diameter at the tip portion that is larger than an outer diameter at the root portion. It is formed to be large.
- cylindrical portion 223 of first packing 220 extends from the contact surface between container 100 and second packing 230 toward caulking portion 214. It has the 1st connection part 224 as an extension part, and the 1st connection part 224 is formed so that the outer diameter of the front-end
- the packing is strongly pressed and the space formed between the first packing 220 and the second packing 230 is formed. It can be seen that the first connection portion 224 of the first packing 220 has escaped. Thereby, it is possible to suppress damage such as cracking of the packing disposed between the container 100 and the positive electrode terminal 200 or the positive electrode current collector 120.
- the end portion on the caulking portion 214 side of the column portion 212 has a shape that spreads outward. For this reason, since the outer diameter of the front end portion of the first connection portion 224 has a shape larger than the outer diameter of the root portion, the spread of the end portion of the fixing portion 210 can be absorbed, so that the packing is cracked, etc. Damage can be suppressed.
- the first connecting portion 224 of the first packing 220 is arranged in a state where a space is formed between the first packing 220 and the second packing 230 in the arranging step.
- the electrical storage element 10 is manufactured by caulking the edge part of the fixing
- the first connecting portion 224 of the first packing 220 can be released into the space formed between the first packing 220 and the second packing 230. .
- damage such as cracking of the packing disposed between the container 100 and the positive electrode terminal 200 or the positive electrode current collector 120 can be suppressed.
- the fixing portion 210 when the fixing portion 210 is caulked, the end portion of the column portion 212 on the positive electrode current collector 120 side is spread outward. For this reason, the first packing 220 and the second packing 230 are separated such that the space between them is defined by at least the second packing 230 and the positive electrode current collector 120 (that is, the space is positive electrode current collector 120). Since the expansion of the end portion of the fixing portion 210 can be absorbed, damage such as cracking of the packing can be suppressed.
- the first packing 220 and the second packing 230 are arranged so that the space extends from the lid 110 side to the positive electrode current collector 120 side, the spread of the end portion of the fixed portion 210 can be further absorbed. Therefore, it is possible to further suppress damage such as cracking of the packing.
- the through hole 235 of the second connection portion 232 is formed so that the cross-sectional shape when cut by a plane parallel to the XZ plane is a linear shape, the through hole 235 of the second connection portion 232 is The cross-sectional shape may be a curved shape.
- the said structure and effect are the same also about the negative electrode terminal 300 side.
- the configuration and effects are the same for the negative electrode terminal 300 side.
- Modification 1 of the above embodiment will be described.
- the through-hole of the second packing has a shape that gradually widens upward.
- FIG. 10 is a cross-sectional view illustrating a process in which the positive electrode terminal 200 according to the first modification of the embodiment of the present invention is fixed to the lid 110 together with the positive electrode current collector 120. Specifically, FIG. 9 corresponds to FIG.
- the power storage element in the present modification includes a second packing 230 a instead of the second packing 230 included in the power storage element 10 in the above embodiment.
- the second packing 230a has a second connection portion 232a instead of the second connection portion 232 included in the second packing 230 in the above embodiment.
- the lower part of the second connection part 232a has a cylindrical shape, and the inner diameter gradually increases upward from the upper end of the cylindrical shape (the end on the Z axis direction plus side). That is, the second connection part 232a has a through hole that gradually widens upward. In other words, the second connection portion 232a has a thin portion that gradually becomes thinner toward the through hole.
- the cross-sectional shape of the through hole is not limited to a circular shape, and may be an elliptical shape or a rectangular shape.
- a space 240a is formed around the first connection portion 224 by disposing the first connection portion 224 of the cylindrical portion 223 in the through hole of the second connection portion 232a.
- the space 240a is a space defined by the cylindrical portion 223, the second packing 230a, and the inner surface 110b of the lid 110, and the first connection portion 224, the second packing 230a, and the positive electrode collection. It is defined by at least any two of the electric body 120, the inner surface 110 b of the lid body 110, and the column part 212.
- the first packing 220 and the second packing 230a are compressed by caulking and the space 240a is closed, so that the first packing 220 and the second packing 230a are sealed.
- a boundary 226a therebetween is formed.
- the space 240a is formed on the lid 110 side of the second connection portion 232a, the distance between the end on the lid 110 side and the column portion 212 at the boundary 226a is the same as the end on the caulking portion 214 side.
- the boundary 226a is formed so as to be larger than the distance from the column portion 212. That is, the first connection part 224 is formed such that the outer diameter of the root part is larger than the outer diameter of the tip part.
- the through hole of the second connection part 232a is formed so that the cross-sectional shape when cut by a plane parallel to the XZ plane is a linear shape, but the through hole of the second connection part 232a
- the shape may be a curved shape.
- FIG. 11 is a cross-sectional view illustrating a process in which the positive electrode terminal 200 according to the second modification of the embodiment of the present invention is fixed to the lid body 110 together with the positive electrode current collector 120. Specifically, FIG. 9 corresponds to FIG.
- the power storage element in the present modification example includes a first packing 220 b and a second packing 230 instead of the first packing 220 and the second packing 230 included in the power storage element 10 in the above embodiment.
- Two packings 230b are provided.
- the first packing 220b has a first connection part 224b of the cylindrical part 223b instead of the first connection part 224 of the cylindrical part 223 of the first packing 220 in the above embodiment.
- the second packing 230b has a second connection portion 232b instead of the second connection portion 232 included in the second packing 230 in the above embodiment.
- the first connecting portion 224b has a cylindrical shape at the top, and the outer surface gradually narrows downward from the lower end (end on the negative side in the Z-axis direction) of the cylindrical shape.
- the first connection part 224b has a thin part that gradually becomes thinner toward the lower end.
- the cross-sectional shape of the outer surface of the first connection portion 224b is not limited to a circular shape, and may be an elliptical shape, a rectangular shape, or the like.
- the second connection portion 232b has a cylindrical through hole.
- a space 240b is formed around the first connection portion 224b by arranging the first connection portion 224b in the through hole of the second connection portion 232b.
- the space 240b is a space defined by the cylindrical portion 223b, the second packing 230b, and the terminal side connection portion 121 of the positive electrode current collector 120.
- the first packing 220b and the second packing 230b are compressed by caulking, and the space 240b is closed, so that the first packing 220b and the second packing 230b are closed.
- a boundary 226b is formed therebetween.
- the space 240b is formed on the caulking portion 214 side of the first connection portion 224b, the distance between the end portion on the lid 110 side and the column portion 212 at the boundary 226b is the distance from the end portion on the caulking portion 214 side.
- the boundary 226b is formed so as to be larger than the distance to the column part 212. That is, the first connection part 224b is formed so that the outer diameter of the root part is larger than the outer diameter of the tip part.
- the outer surface of the first connection portion 224b is formed so that the cross-sectional shape when cut by a plane parallel to the XZ plane is a linear shape, but the outer surface of the first connection portion 224b has the cross-sectional shape. It may be formed in a curved shape.
- first connection part 224b may have a configuration that is upside down from the above modification.
- first connection portion 224b may have a cylindrical shape at the lower portion and a shape in which the outer surface gradually narrows upward from the upper end of the cylindrical shape.
- Modification 3 of the above embodiment will be described.
- a recess is formed in the lower part of the second connection part of the second packing.
- FIG. 12 is a cross-sectional view illustrating a process in which the positive electrode terminal 200 according to the third modification of the embodiment of the present invention is fixed to the lid body 110 together with the positive electrode current collector 120. Specifically, FIG. 9 corresponds to FIG.
- the power storage element in the present modification includes a second packing 230c instead of the second packing 230 included in the power storage element 10 in the above embodiment.
- the second packing 230c has a second connection portion 232c instead of the second connection portion 232 included in the second packing 230 in the above embodiment.
- the second connection part 232c has a cylindrical through-hole, and an annular recess is formed in the lower part (the surface on the negative side in the Z-axis direction) so as to surround the through-hole.
- the second connection portion 232c has a thin portion around the through hole.
- the cross-sectional shape of the recess is not limited to a rectangular shape, and may be a triangular shape or an arc shape.
- the space 240c is a space defined by the second packing 230c and the terminal-side connecting portion 121 of the positive electrode current collector 120.
- the first packing 220 and the second packing 230c are compressed by caulking, and the space 240c is closed, so that the first packing 220 and the second packing 230c are closed.
- a boundary 226c therebetween is formed.
- the space 240c is formed on the caulking portion 214 side of the second connection portion 232c, the distance between the end portion on the caulking portion 214 side and the column portion 212 at the boundary 226c is the distance from the end portion on the lid body 110 side.
- the boundary 226c is formed so as to be larger than the distance from the column part 212. That is, the first connection portion 224 is formed so that the outer diameter of the tip portion is larger than the outer diameter of the root portion.
- the second connecting portion 232c may have an annular recess formed in the upper portion (the surface on the plus side in the Z-axis direction).
- Modification 4 of the above embodiment will be described.
- a concave portion in which the inner surface of the first connection portion of the first packing is recessed is formed.
- FIG. 13 is a cross-sectional view showing a process in which the positive electrode terminal 200 according to the fourth modification of the embodiment of the present invention is fixed to the lid 110 together with the positive electrode current collector 120. Specifically, FIG. 9 corresponds to FIG.
- the power storage element in the present modification example includes a first packing 220 d and a second packing 230 instead of the first packing 220 and the second packing 230 included in the power storage element 10 in the above embodiment.
- Two packings 230d are provided.
- the first packing 220d has a first connection part 224d of the cylindrical part 223d instead of the first connection part 224 of the cylindrical part 223 of the first packing 220 in the above embodiment.
- the second packing 230d has a second connection portion 232d instead of the second connection portion 232 included in the second packing 230 in the above embodiment.
- the first connection part 224d has a concave part in which the inner surface of the lower part is recessed stepwise. In other words, the first connection part 224d has a thin part formed by expanding the inner surface at the tip part.
- the second connection portion 232d has a cylindrical through hole, is arranged so as to cover the periphery of the column portion 212, and has a concave portion whose upper surface is recessed stepwise around the through hole. Have. In other words, the second connection part 232d has a thin part formed around the pillar part 212.
- a space 240d is formed around the column portion 212 by disposing the first connection portion 224d on the upper surface of the thin portion of the second connection portion 232d.
- the space 240d is a space defined by the cylindrical portion 223d, the second packing 230d, and the column portion 212.
- the first packing 220d and the second packing 230d are compressed by caulking, and the space 240d is closed, so that the first packing 220d and the second packing 230d are closed.
- a boundary 226d therebetween is formed.
- the space 240d is formed closer to the lid body 110 than the caulking portion 214, the distance between the end portion on the caulking portion 214 side and the column portion 212 at the boundary 226d is the distance between the end portion on the lid body 110 side and the column portion.
- the boundary 226d is formed so as to be larger than the distance to the portion 212. That is, the first connection portion 224d is formed so that the outer diameter of the tip portion is larger than the outer diameter of the root portion.
- the outer edges of the concave portions of the first connection portion 224d and the second connection portion 232d are formed so that the cross-sectional shape when cut along a plane parallel to the XZ plane is a linear shape. It does not matter if it is formed to be.
- first connection part 224d may have a recess in which the outer surface of the lower part is recessed stepwise. That is, the first connection part 224d may have a thin part formed by reducing the outer diameter of the outer surface at the tip part.
- FIG. 14 is a cross-sectional view illustrating a process in which the positive terminal 200 according to the fifth modification of the embodiment of the present invention is fixed to the lid 110 together with the positive current collector 120. Specifically, FIG. 9 corresponds to FIG.
- the power storage element in this modification has a second packing 230e instead of the second packing 230 included in the power storage element 10 in the above embodiment.
- the second packing 230e has a second connection portion 232e instead of the second connection portion 232 included in the second packing 230 in the above embodiment.
- the upper part of the second connection part 232e has a cylindrical shape, and its inner diameter increases downward from the lower end (end on the negative side in the Z-axis direction) of the cylindrical shape (than the second connection part 232 in the above embodiment). It has a large and wide shape. With this configuration, a large space 240 e is formed around the first connection portion 224. In this modification, the space 240e is a space defined by the cylindrical portion 223, the second packing 230e, and the terminal side connection portion 121 of the positive electrode current collector 120.
- the boundary 226e between the 1st packing 220 and the 2nd packing 230e is formed similarly to the said embodiment.
- the boundary 226e is formed such that the distance between the end portion on the caulking portion 214 side and the column portion 212 is larger than the distance between the end portion on the lid 110 side and the column portion 212. That is, the first connection portion 224 is formed so that the outer diameter of the tip portion is larger than the outer diameter of the root portion.
- the space 240e is a large space before caulking, it is not blocked by caulking, and a small space remains even after caulking. That is, the first connection part 224 as an extension part of the cylindrical part 223 is adjacent to the space 240e formed between the second packing 230e. In other words, the cylindrical part 223 is formed so that the boundary 226 with the second packing 230e is adjacent to the space 240e.
- the same effect as in the above embodiment can be obtained.
- the first connecting portion 224 is formed so as to be adjacent to the space between the second packing 230, even if the packing is strongly pressed by caulking, it is possible to ensure a place for the packing to escape. Thereby, it is possible to suppress damage such as cracking of the packing.
- the first packing the first connecting portion as the extending portion
- the second packing has a thin portion that is thinner than the other portions, and is adjacent to the thin portion.
- a space is formed at the position to be.
- FIG. 15 is a cross-sectional view showing a configuration in which the positive electrode terminal 200 according to the sixth modification of the embodiment of the present invention is fixed to the lid 110 together with the positive electrode current collector 120. Specifically, this figure corresponds to FIG.
- FIG. 16 is a diagram showing a configuration of a second packing 230f according to Modification 6 of the embodiment of the present invention. Specifically, (a) in the figure is a cross-sectional view (the figure before assembly) of the second packing 230f, and (b) in the figure shows the second packing 230f above (Z axis direction plus side). It is a top view at the time of seeing from.
- the power storage element in the present modification has a second packing 230 f instead of the second packing 230 included in the power storage element 10 in the above embodiment.
- the first packing 220 in this modification has a slightly shorter length of the cylindrical portion 223 than the first packing 220 in the above embodiment, but the other configurations are the same, and thus the same.
- the detailed description is abbreviate
- the second packing 230f has a rectangular and flat plate portion 231f and a second connection portion 232f arranged inside the flat plate portion 231f.
- the 2nd connection part 232f is a site
- the through hole 235f is a circular opening in which the fixing portion 210 of the positive electrode terminal 200 is disposed inward. That is, the column portion 212 of the fixed portion 210 is inserted into the through hole 235f.
- the thin part 233f is a site
- the second connection portion 232f has a configuration in which the annular (doughnut-shaped) thin portion 233f is formed around the through-hole 235f, and thus the recess 234f having a circular cross section is formed around the through-hole 235f. It has become.
- the first connection portion 224 of the cylindrical portion 223 of the first packing 220 is disposed in the recess 234f.
- the cross-sectional shape of the through hole 235f is not limited to a circular shape, and may be an elliptical shape or a rectangular shape.
- the cross-sectional shape of the recess 234f is not limited to a circular shape, and may be an elliptical shape or a rectangular shape.
- the thin part 233f is formed in the 2nd connection part 232f in this Embodiment, you may form in the 1st connection part 224.
- the thin portion 233f is disposed between the container 100 and the positive electrode current collector 120, and a space 240f is formed at a position adjacent to the thin portion 233f.
- the space 240f is disposed adjacent to the first connection portion 224 and the second connection portion 232f, and is disposed around (outside) the fixed portion 210.
- the space 240f is disposed adjacent to the first connection portion 224, which is the tip of the cylindrical portion 223, and the inner surface of the opening formed in the second connection portion 232f (the inner surface of the recess 234f). ). That is, the space 240f is disposed adjacent to the outer surface of the first connection portion 224 and the inner surface of the opening of the second connection portion 232f so as to be sandwiched between the first connection portion 224 and the second connection portion 232f. Yes.
- the space 240f is disposed adjacent to the lower surface of the lid 110 and the upper surface of the thin portion 233f so as to be sandwiched between the lid 110 and the thin portion 233f. That is, the space 240f is a space surrounded by the outer surface of the first connection portion 224, the inner surface of the opening portion of the second connection portion 232f, the lower surface of the lid 110, and the upper surface of the thin portion 233f.
- the opening part in which the cylindrical part 223 is inserted is formed in the second packing 230f, and the inner peripheral surface of the opening part partially forms the space.
- the cylindrical portion 223 is disposed so as to protrude from the surface 236f on the lid 110 side of the second packing 230f toward the caulking portion 214, and the boundary 226f with the second packing 230f is adjacent to the space 240f. Is formed. That is, the first connection part 224 is inserted into the recess 234f formed by the thin part 233f, contacts the thin part 233f, and a space 240f is formed around the first connection part 224.
- the space 240f is a space defined by the cylindrical portion 223, the second packing 230f, and the inner surface 110b of the lid 110.
- a relief portion 225 is formed at the tip of the first connection portion 224 of the first packing 220. That is, when the terminal main body portion 201 and the positive electrode current collector 120 are caulked by the fixing portion 210, the first packing 220 and the second packing 230f are pressed, and the first connection portion 224 of the first packing 220 or A part of the second connection portion 232f of the second packing 230f may escape into the space 240f.
- the escape portion 225 is a portion formed by the first connection portion 224 of the first packing 220 escaping into the space 240f.
- the escape portion 225 is disposed between the lid 110 and the thin portion 233f of the second packing 230f. That is, the first packing 220 is arranged so that the lid 110 is sandwiched between the flat plate portion 221 and the escape portion 225.
- the escape portion 225 in the first connection portion 224 of the first packing 220, it is difficult for the first packing 220 to come off from the lid 110, and the airtightness can be improved.
- a relief portion 225 may be formed, but in the following modified examples 7 to 12, the relief portion 225 is omitted for the sake of simplicity of explanation. It will be illustrated and described.
- the electricity storage device can also be manufactured by the same method as in the above embodiment. That is, as an arranging step, the first connection portion 224 of the cylindrical portion 223 protrudes from the contact surface between the inner surface 110b of the lid 110 and the second packing 230f toward the caulking portion 214, and the first connection portion 224 is formed.
- the first packing 220 and the second packing 230f are arranged so that a space 240f is formed between the first packing 220f and the second packing 230f.
- the column portion 212 of the fixing portion 210 is inserted into the cylindrical portion 223, and one end portion (end portion on the negative side in the Z-axis direction) of the fixing portion 210 is caulked, A caulking portion 214 that contacts is formed.
- the cylindrical portion 223 is formed so that the boundary 226f is adjacent to the space 240f. That is, the first connection part 224 is formed so as to be adjacent to the space 240f formed between the second packing 230f.
- the first packing 220 between the positive electrode terminal 200 and the container 100, and the first packing 220 between the positive electrode current collector 120 and the container 100 At least one of the connecting portions with the two packings 230f (second connecting portion 232f in the present embodiment) has a thin portion 233f, and a space 240f is formed adjacent to the thin portion 233f. For this reason, the space 240f is formed adjacent to the thin-walled portion 233f of the connection portion, so that the packing can be prevented by caulking by rivets when the positive electrode terminal 200 and the positive electrode current collector 120 are fixed to the container 100. Even if it is strongly pressed, it is possible to secure a place of escape for the connecting portion. Thereby, it is possible to suppress damage such as cracking of the packing disposed between the container 100 and the positive electrode terminal 200 or the positive electrode current collector 120.
- a space 240f is arranged adjacent to the first connection part 224 of the first packing 220 and the second connection part 232f of the second packing 230f.
- a space 240f serving as a refuge when the packing is strongly pressed can be formed by the wall surface (outer peripheral surface) of the first connection portion 224 and the wall surface of the second connection portion 232f (inner peripheral surface of the opening).
- the space 240f can be easily formed.
- a space 240f is arranged adjacent to the inner surface of the opening formed in the second connection portion 232f. That is, since the space 240f serving as a refuge when the packing is strongly pressed can be formed on the inner surface of the opening, the space 240f can be easily formed.
- the thin-walled portion 233f of the packing is disposed between the container 100 and the positive electrode current collector 120, the thin-walled portion 233f can be connected to the burr and the positive electrode current collector even when burrs are left in the container 100 during processing. By being sandwiched between the body 120, the container 100 and the positive electrode current collector 120 can be prevented from being short-circuited.
- the first packing 220 and the second packing 230f are arranged between the terminal main body 201 and the positive electrode current collector 120, and the terminal main body 201 and the positive electrode current collector 120 are fixed to the fixing unit 210.
- the space 240f is arranged around the fixed portion 210. That is, the first packing 220 and the second packing 230f are pressed when the terminal main body 201 and the positive electrode current collector 120 are sandwiched by the fixing portion 210, but a space 240f is formed around the fixing portion 210.
- the escape place of the connection part when the said packing is pressed can be ensured. Thereby, it is possible to suppress damage such as cracking of the packing disposed between the container 100 and the positive electrode terminal 200 or the positive electrode current collector 120.
- the first packing 220 has a cylindrical portion 223 outside the fixed portion 210 and inside the opening of the container 100, and a space 240 f is arranged adjacent to the tip of the cylindrical portion 223. ing. Thereby, the escape place of the cylindrical part 223 when the 1st packing 220 is pressed can be ensured, and it can suppress that the said packing cracks and damages.
- a space 240f is disposed adjacent to the outer surface of the first connection portion 224 at the tip of the cylindrical portion 223 of the first packing 220 and the inner surface of the opening of the second connection portion 232f of the second packing 230f. ing. That is, since the space 240f serving as a refuge when the packing is strongly pressed can be formed by the outer surface of the tip of the cylindrical portion 223 of the first packing 220 and the inner surface of the opening of the second packing 230f, The space 240f can be easily formed.
- Modification 7 of the above embodiment will be described.
- a space is formed at a position different from that of Modification 6 described above.
- FIG. 17 is a cross-sectional view showing a configuration in which the positive electrode terminal 200 according to the modified example 7 of the embodiment of the present invention is fixed to the lid body 110 together with the positive electrode current collector 120. Specifically, this figure corresponds to FIG.
- the power storage element in the present modification has a second packing 230 g instead of the second packing 230 f included in the power storage element in Modification 6.
- the second packing 230g has a flat plate portion 231g and a second connection portion 232g, and the second connection portion 232g has a thin portion 233g.
- an opening having an inner diameter larger than the outer diameter of the column part 212 of the fixed part 210 is formed in the second connection part 232g.
- the space 240g is arranged around the fixed portion 210. That is, the space 240g is disposed adjacent to the outer surface of the fixed portion 210 and the inner surface of the opening of the second connection portion 232g.
- the space 240g includes the outer surface of the fixed portion 210, the inner surface of the opening of the second connection portion 232g, the lower surface of the first connection portion 224 of the first packing 220, and the terminal side of the positive electrode current collector 120. It is a space surrounded by the upper surface of the connection part 121.
- FIG. 1 a space 240g is disposed adjacent to the outer surface of the fixed portion 210 and the inner surface of the opening of the second connection portion 232g. That is, the space 240g serving as a refuge when the packing is strongly pressed can be formed by the outer surface of the fixed portion 210 and the inner surface of the opening of the second packing 230g, so that the space 240g can be easily formed. it can.
- FIG. 18 is a cross-sectional view showing a configuration in which the positive electrode terminal 200 according to the modified example 8 of the embodiment of the present invention is fixed to the lid body 110 together with the positive electrode current collector 120. Specifically, this figure corresponds to FIG.
- the power storage element in the present modification includes a first packing 220h and a second packing 230h instead of the first packing 220 and the second packing 230f included in the power storage element in the sixth modification. Yes.
- the 1st packing 220h has the cylindrical part 223h, and the 1st connection part 224h is arrange
- the first connection portion 224h has a thin portion 227h that is thinner than other portions.
- the second packing 230h has a flat plate portion 231h and a second connection portion 232h, and the second connection portion 232h has an opening having an inner diameter larger than the outer diameter of the column portion 212 of the fixed portion 210.
- the part is formed.
- the space 240h is arranged around the fixed portion 210. That is, the space 240h is disposed adjacent to the outer surface of the fixed portion 210 and the inner surface of the opening of the second connection portion 232h.
- the thin part is not formed in the 2nd connection part 232h.
- the space 240h includes the outer surface of the fixed portion 210, the inner surface of the opening portion of the second connection portion 232h, the lower surface of the thin portion 227h of the first connection portion 224h, and the terminal side connection of the positive electrode current collector 120.
- the first connecting portion 224h of the first packing 220h has a thin portion 227h, and a space 240h is formed adjacent to the thin portion 227h.
- the space 240h is formed adjacent to the thin-walled portion 227h of the connection portion, so that the packing can be prevented by caulking by rivets when the positive electrode terminal 200 and the positive electrode current collector 120 are fixed to the container 100. Even if it is strongly pressed, it is possible to secure a place of escape for the connecting portion. Thereby, it is possible to suppress damage such as cracking of the packing disposed between the container 100 and the positive electrode terminal 200 or the positive electrode current collector 120.
- 19 to 21 are cross-sectional views showing a configuration in which the positive terminal 200 according to the modified examples 9 to 11 of the embodiment of the present invention is fixed to the lid 110 together with the positive current collector 120. Specifically, these figures correspond to FIG.
- the electricity storage device in Modification 9 has a first packing 220i and a second packing 230i instead of the first packing 220 and the second packing 230f included in the electricity storage device in Modification 6. is doing.
- the first packing 220i has a cylindrical portion 223i, and a first connection portion 224i is disposed at the tip of the cylindrical portion 223i.
- the first connection portion 224i has a thin portion 227i that is thinner than other portions.
- the second packing 230i has a flat plate portion 231i and a second connection portion 232i, and the second connection portion 232i has a thin portion 233i.
- the 1st connection part 224i and the 2nd connection part 232i are fitting because the thin part 227i and the thin part 233i contact
- an opening (concave portion) having an inner diameter larger than the outer diameter of the first connection portion 224i of the first packing 220i is formed in the second connection portion 232i.
- the space 240i is arranged around the first connection portion 224i. That is, the space 240i is disposed adjacent to the outer surface of the first connection portion 224i and the inner surface of the opening portion of the second connection portion 232i.
- the space 240i includes an outer surface of the first connection portion 224i, an inner surface of the opening portion of the second connection portion 232i, an upper surface of the thin portion 233i of the second connection portion 232i, and a lower surface of the lid 110. It is an enclosed space.
- the first packing 220j has a cylindrical portion 223j, and the first connection portion 224j is disposed at the tip of the cylindrical portion 223j. .
- the first connection portion 224j has a thin portion 227j that is thinner than other portions.
- the second packing 230j has a flat plate portion 231j and a second connection portion 232j, and the second connection portion 232j has a thin portion 233j. And the 1st connection part 224j and the 2nd connection part 232j are fitting.
- the second connection portion 232j is formed with an opening (concave portion) having an inner diameter larger than the outer diameter of the thin portion 227j of the first packing 220j.
- the space 240j is arranged around the thin portion 227j. That is, the space 240j is disposed adjacent to the outer surface of the thin portion 227j and the inner surface of the opening of the second connection portion 232j. Specifically, the space 240j is a space surrounded by the outer surface of the thin portion 227j, the inner surface of the opening of the second connection portion 232j, the upper surface of the thin portion 233j, and the lower surface of the first connection portion 224j. .
- the 1st packing 220k has the cylindrical part 223k, and the 1st connection part 224k is arrange
- the first connection portion 224k has a thin portion 227k that is thinner than other portions.
- an opening (concave portion) having an inner diameter larger than the outer diameter of the column portion 212 of the fixed portion 210 is formed in the first connection portion 224k.
- the second packing 230k has a flat plate portion 231k and a second connection portion 232k, and the second connection portion 232k has a thin portion 233k. And the 1st connection part 224k and the 2nd connection part 232k are fitting.
- a space 240k is arranged around the column portion 212. That is, the space 240k is disposed adjacent to the outer surface of the column portion 212 and the inner surface of the opening formed in the first connection portion 224k (the inner surface of the thin portion 227k of the first connection portion 224k). Specifically, the space 240k is a space surrounded by the outer surface of the pillar portion 212, the inner surface of the thin portion 227k, the lower surface of the first connection portion 224k, and the upper surface of the thin portion 233k of the second connection portion 232k. is there. This modification is different from Modification 4 described above in that the space 240k remains unoccluded even after fixing by caulking.
- both of the connecting portions of the first packing and the second packing have a thin portion, and a space is formed adjacent to the thin portion.
- the space is formed adjacent to the thin portion of the connection portion, so that the packing is strongly pressed by caulking by a rivet when the positive electrode terminal 200 and the positive electrode current collector 120 are fixed to the container 100. Even if it is done, the escape place of the said connection part can be ensured. Thereby, it is possible to suppress damage such as cracking of the packing disposed between the container 100 and the positive electrode terminal 200 or the positive electrode current collector 120.
- a space is arranged adjacent to the inner surface of the opening formed in the first connection portion. That is, since a space serving as a escape place when the packing is strongly pressed can be formed on the inner surface of the opening, the space can be easily formed.
- Modification 12 of the above embodiment will be described.
- the cylindrical portion is arranged separately from the first packing. That is, in the said embodiment and said modification, it was set as the structure divided
- FIG. 22 is a cross-sectional view showing a configuration in which positive electrode terminal 200 according to Modification 12 of the embodiment of the present invention is fixed to lid 110 together with positive electrode current collector 120. Specifically, this figure corresponds to FIG.
- the power storage element in the present modified example is replaced with the first packing 220 l, the second packing 230 l, and the third packing instead of the first packing 220 and the second packing 230 f included in the power storage element in the modified example 6. 250.
- the portion that was the cylindrical portion 223 of the first packing 220 in the modified example 6 is formed as a third packing 250 separately from the first packing 220l.
- the 1st packing 220l has the 1st connection part 228l, and the 1st connection part 228l has the thin part 229l whose thickness is thinner than other parts.
- the second packing 230l has a second connection portion 232l, and the second connection portion 232l has a thin portion 233l that is thinner than other portions.
- the third packing 250 has a cylindrical shape.
- an opening (concave portion) having an inner diameter larger than the outer diameter of the third packing 250 is formed in the first connection portion 228l.
- the space 241 l is disposed around the third packing 250. That is, the space 241l is disposed adjacent to the outer surface of the third packing 250 and the inner surface of the opening of the first connection portion 228l.
- an opening (concave portion) having an inner diameter larger than the outer diameter of the third packing 250 is formed in the second connection portion 232l.
- the space 242 l is arranged around the third packing 250. That is, the space 242l is disposed adjacent to the outer surface of the third packing 250 and the inner surface of the opening of the second connection portion 232l.
- the space 241 l is surrounded by the outer surface of the third packing 250, the inner surface of the opening of the first connection portion 228 l, the lower surface of the thin portion 229 l of the first connection portion 228 l, and the upper surface of the lid 110.
- the space 242l is a space surrounded by the outer surface of the third packing 250, the inner surface of the opening of the second connection portion 232l, the upper surface of the thin portion 233l of the second connection portion 232l, and the lower surface of the lid 110. It is.
- each packing can be made in a simple shape, so that the packing can be easily manufactured.
- the caulking portion 214 is disposed at the end portion of the fixed portion 210 on the positive electrode current collector 120 side (inner side of the container 100). did. However, the caulking portion 214 may be disposed at the end portion of the fixed portion 210 on the positive electrode terminal 200 side (outside of the container 100). That is, in the above-described embodiment and its modification, the first packing and the second packing are vertically inverted (the boundary or / and the space between the first packing and the second packing is the positive electrode terminal 200 and the lid body. 110).
- the first packing is disposed between the terminal body 201 and the outer surface 110a of the lid 110 when viewed in the normal direction of the lid 110.
- the second packing is disposed at least partially between the inner surface 110 b of the lid 110 and the positive electrode current collector 120 when viewed in the normal direction of the lid 110, and is inserted into the lid hole 112. It has a cylindrical part.
- the cylindrical portion has a second connection portion that is an extending portion that extends from the contact surface between the outer surface 110 a of the lid body 110 and the first packing toward the caulking portion 214.
- the second connecting portion has an outer diameter at the tip closest to the caulking portion 214 when viewed in the normal direction of the lid 110 is different from an outer diameter at the base opposite to the tip. Adjacent to the space formed between one packing.
- both the positive electrode current collector 120 side (inner side of the container 100) and the positive electrode terminal 200 side (outer side of the container 100) are caulked.
- the positive electrode terminal 200 side and the negative electrode terminal 300 side decided to have the same structure, said structure is either the positive electrode terminal 200 side or the negative electrode terminal 300 side. You may have only one.
- the positive electrode terminal 200, the negative electrode terminal 300, etc. were attached to the cover body 110 of the container 100, plate-shaped parts other than the cover body 110 which the container 100 has (main body) 111 wall or the like).
- modification examples 1 to 4 may be modified in the modification example 5 described above, or the modification examples 1 to 11 may be modified in the modification example 12 described above.
- the present invention can be applied to power storage elements such as lithium ion secondary batteries.
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Abstract
Description
上記従来の蓄電素子では、容器に電極端子と集電体とを固定する際に、パッキンが割れるなど損傷することで、密閉性や絶縁性を確保できなくなる虞があるという問題がある。つまり、従来の蓄電素子においては、容器に電極端子と集電体とを固定する際に、リベットによるかしめなどにより、パッキンが強く押圧される。そして、このパッキンが強く押圧されることによって、パッキンが割れるなど損傷する場合がある。
まず、蓄電素子10の構成について、説明する。
次に、上記実施の形態の変形例1について、説明する。本変形例は、第二パッキンの貫通孔が、上方へ向けて徐々に広がる形状を有している。
次に、上記実施の形態の変形例2について、説明する。本変形例は、第一パッキンの第一接続部の外面が、下方へ向けて徐々に狭まる形状を有している。
次に、上記実施の形態の変形例3について、説明する。本変形例は、第二パッキンの第二接続部の下部に凹部が形成されている。
次に、上記実施の形態の変形例4について、説明する。本変形例は、第一パッキンの第一接続部の内面が凹んだ凹部が形成されている。
次に、上記実施の形態の変形例5について、説明する。本変形例は、第二パッキンの貫通孔が、下方へ向けて大きく広がる形状を有している。
次に、上記実施の形態の変形例6について、説明する。
次に、上記実施の形態の変形例7について、説明する。本変形例は、上記変形例6とは異なる位置に空間が形成されている。
次に、上記実施の形態の変形例8について、説明する。本変形例は、上記変形例6とは異なり、第一パッキンの第一接続部が薄肉部を有している。
次に、上記実施の形態の変形例9~11について、説明する。本変形例は、上記変形例6とは異なり、第一パッキンの第一接続部及び第二パッキンの第二接続部の双方が薄肉部を有している。
次に、上記実施の形態の変形例12について、説明する。本変形例は、上記変形例6とは異なり、第一パッキンから筒状部が分離して配置されている。つまり、上記実施の形態及び上記の変形例では、第一パッキンと第二パッキンの2つのパッキンに分割して配置されている構成としたが、本変形例では、3つのパッキンに分割して配置される。
100 容器
110 蓋体
110a 外表面
110b 内表面
111 本体
112 蓋体孔部
120 正極集電体
121、131 端子側接続部
122、132 電極体接続部
123 集電体開口部
130 負極集電体
140 電極体
200 正極端子
201、301 端子本体部
202 凹部
203 端子開口部
210、310 固定部
211 上面部
212 柱部
213 空間
214 かしめ部
220、220b、220d、220h、220i、220j、220k、220l、320 第一パッキン
221 平板部
222 突出部
223、223b、223d、223h、223i、223j、223k 筒状部
224、224b、224d、224h、224i、224j、224k、228l 第一接続部
225 逃げ部
226、226a、226b、226c、226d、226e、226f 境界
227h、227i、227j、227k、229l、233f、233g、233i、233j、233k、233l 薄肉部
230、230a、230b、230c、230d、230e、230f、230g、230h、230i、230j、230k、230l、330 第二パッキン
231、231f、231g、231h、231i、231j、231k、231l 平板部
232、232a、232b、232c、232d、232e、232f、232g、232h、232i、232j、232k、232l 第二接続部
234f 凹部
235、235f 貫通孔
236、236f 面
240、240a、240b、240c、240d、240e、240f、240g、240h、240i、240j、240k、241l、242l 空間
250 第三パッキン
300 負極端子
Claims (9)
- 外表面および内表面を有するとともに孔部が形成された板状部を有する容器と、
前記板状部の外表面に配置される端子本体部を有する電極端子と、
前記板状部の内表面に配置される集電体と、
前記板状部の法線方向に見て、前記端子本体部と前記板状部の外表面との間に少なくともその一部が配置される第一パッキンであって、前記孔部に挿入される筒状部を有する第一パッキンと、
前記板状部の法線方向に見て、前記板状部の内表面と前記集電体との間に少なくともその一部が配置される第二パッキンと、
前記筒状部に挿入される柱部と、前記柱部の端部に形成されて前記集電体と接するかしめ部とを有する固定部と、を備え、
前記筒状部は、前記板状部の内表面と前記第二パッキンとの接触面から前記かしめ部に向かって延びる延出部を有し、
前記延出部は、前記板状部の法線方向に見て前記かしめ部に最も近い先端部の外径が前記先端部とは反対の根元部の外径と異なっている、または、前記第二パッキンとの間に形成された空間に隣接している、蓄電素子。 - 外表面および内表面を有するとともに孔部が形成された板状部を有する容器と、
前記板状部の外表面に配置される端子本体部を有する電極端子と、
前記板状部の内表面に配置される集電体と、
前記板状部の法線方向に見て、前記端子本体部と前記板状部の外表面との間に少なくともその一部が配置される第一パッキンと、
前記板状部の法線方向に見て、前記板状部の内表面と前記集電体との間に少なくともその一部が配置される第二パッキンであって、前記孔部に挿入される筒状部を有する第二パッキンと、
前記筒状部に挿入される柱部と、前記柱部の端部に形成されて前記端子本体部と接するかしめ部とを有する固定部と、を備え、
前記筒状部は、前記板状部の外表面と前記第一パッキンとの接触面から前記かしめ部に向かって延びる延出部を有し、
前記延出部は、前記板状部の法線方向に見て前記かしめ部に最も近い先端部の外径が前記先端部とは反対の根元部の外径と異なっている、または、前記第一パッキンとの間に形成された空間に隣接している、蓄電素子。 - 前記延出部は、前記板状部の法線方向に見て前記先端部の外径が、前記根元部の外径より大きい、請求項1または2に記載の蓄電素子。
- 前記延出部および前記第二パッキンの少なくとも一方は、他の部分よりも厚さが薄い薄肉部を有しており、
前記薄肉部に隣接する位置に、前記空間が形成されている
請求項1に記載の蓄電素子。 - 前記第二パッキンに、前記筒状部が挿入される開口部が形成され、前記開口部の内周面が前記空間を部分的に形成している
請求項4に記載の蓄電素子。 - 前記筒状部は、前記第一パッキンと別体に形成されている
請求項1に記載の蓄電素子。 - 外表面および内表面を有するとともに孔部が形成された板状部を有する容器と、前記板状部の外表面に配置される端子本体部を有する電極端子と、前記板状部の内表面に配置される集電体と、前記板状部の法線方向に見て、前記端子本体部と前記板状部の外表面との間に少なくともその一部が配置される第一パッキンであって、前記孔部に挿入される筒状部を有する第一パッキンと、前記板状部の法線方向に見て、前記板状部の内表面と前記集電体との間に少なくともその一部が配置される第二パッキンとを備える蓄電素子の製造方法であって、
前記筒状部の延出部が、前記板状部の内表面と前記第二パッキンとの接触面から前記かしめ部に向かって突出し、かつ、前記延出部と前記第二パッキンと前記集電体と前記板状部の内表面と前記柱部のうちの少なくとも何れか2つによって空間が画定されるように、前記第一パッキン及び前記第二パッキンを配置する配置工程と、
前記固定部の柱部を前記筒状部に挿入し、前記固定部の端部をかしめることで、前記集電体と接するかしめ部を形成するかしめ工程とを含む、蓄電素子の製造方法。 - 前記配置工程では、前記空間が、少なくとも前記第二パッキンと前記集電体とで画定されるように、前記第一パッキン及び前記第二パッキンを配置する、請求項7に記載の蓄電素子の製造方法。
- 前記配置工程では、前記空間が、前記板状部の法線方向に見て、前記板状部側から前記集電体側にかけて広がるように、前記第一パッキン及び前記第二パッキンを配置する、請求項7または8に記載の蓄電素子の製造方法。
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