WO2015041116A1 - 蓄電デバイス - Google Patents
蓄電デバイス Download PDFInfo
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- WO2015041116A1 WO2015041116A1 PCT/JP2014/073928 JP2014073928W WO2015041116A1 WO 2015041116 A1 WO2015041116 A1 WO 2015041116A1 JP 2014073928 W JP2014073928 W JP 2014073928W WO 2015041116 A1 WO2015041116 A1 WO 2015041116A1
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- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0568—Liquid materials characterised by the solutes
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M50/102—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
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- 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
- H01M50/1535—Lids or covers characterised by their shape adapted for specific cells, e.g. electrochemical cells operating at high temperature
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- 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
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
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- 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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- 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
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
- H01M50/466—U-shaped, bag-shaped or folded
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- 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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to an electricity storage device, and more particularly, to an improvement in a sealing structure of a case that houses an electricity storage element.
- This application is filed with Japanese Application No. 2013-193565 filed on September 18, 2013, Japanese Application No. 2013-197132 filed on September 24, 2013, and Japanese Application No. 2013-210482 filed on October 7, 2013. Claiming the priority based on the issue, and using all the contents described in the Japanese application.
- the electricity storage device includes a first electrode, a second electrode, an electrode group having a separator interposed therebetween, and an electrolyte.
- Each electrode includes a current collector (electrode core material) and an active material layer carried on the current collector.
- the open end of the case is sealed by a sealing plate.
- a sealing board is attached to the opening edge part of a case by laser welding, for example (refer patent document 1).
- the sealing plate In the case of a sealing structure in which the sealing plate is attached by welding to the opening end of the case, the sealing plate is not placed on the opening end, but inside the opening end of the case 14A as shown in FIG.
- the inner surface of the opening end and the peripheral edge of the sealing plate are laser welded in a state where the sealing plate 16A is fitted.
- the laser beam can be irradiated from a direction perpendicular to the outer surface of the sealing plate.
- the peripheral edge of the sealing plate can be welded to the open end of the case over the entire circumference only by moving either the case or the laser head two-dimensionally without any change in posture. . Therefore, the open end of the case can be easily sealed.
- power storage devices are based on mass production.
- a product constituted by a case and a sealing plate that do not reach the required accuracy.
- capacitance fall) of a foreign material mixing may appear after a certain period of time. In such a case, it is also difficult to find through inspection that foreign matter has entered the case at the time of sealing.
- One aspect of the present invention is an electrode group including a first electrode, a second electrode, and a separator that electrically insulates the first electrode and the second electrode; Electrolyte, A bottom-closed case having an open edge that accommodates the electrode group and the electrolyte; and A sealing plate having a first main surface facing the outside of the case and a second main surface facing the inside of the case, and sealing the opening end of the case;
- the first electrode includes a sheet-like first current collector and a first active material carried on the first current collector,
- the second electrode includes a sheet-like second current collector and a second active material carried on the second current collector,
- the first electrode and the second electrode are stacked with the separator sandwiched between the first electrode and the second electrode,
- the sealing plate has a peripheral portion that fits into the opening end portion of the case, and has a first inclined surface that forms an acute angle ⁇ 1 with the first main surface at least at a part of the peripheral portion.
- the opening end portion of the case has a second
- Electrolyte A bottomed case having an open end, which accommodates the electrode group and the electrolyte; A first main surface facing the outer side of the case and a second main surface facing the inner side of the case; and a peripheral edge that fits into the opening end of the case; and at least a part of the peripheral edge And a sealing plate having a first slope that forms an acute angle ⁇ 1 with the first main surface and sealing the opening end of the case,
- the first electrode includes a sheet-like first current collector and a first active material carried on the first current collector
- the second electrode includes a sheet-like second current collector and a second active material carried on the second current collector,
- the first electrode and the second electrode are stacked with the separator sandwiched between the first electrode and the second electrode, Having a sealing structure in which the sealing plate is attached to the opening end of the case by welding; The open end of the
- the electrical storage device which has desired performance can be manufactured more stably.
- An electricity storage device includes an electrode group including a first electrode, a second electrode, a separator that electrically insulates the first electrode and the second electrode, an electrolyte, an electrode group, and an electrolyte. And a bottomed case having an open end portion and a sealing plate for sealing the open end portion.
- the sealing plate has a first main surface 16b (see FIG. 8) facing the outside of the case and a second main surface 16c facing the inside of the case in a state where the opening end of the case is sealed.
- the first electrode includes a sheet-like first current collector and a first active material supported on the first current collector.
- the second electrode includes a sheet-like second current collector and a second active material carried on the second current collector.
- the first electrode and the second electrode are stacked with a separator sandwiched between the first electrode and the second electrode.
- the first electrodes and the second electrodes are alternately stacked with a separator sandwiched between the first electrode and the second electrode.
- the sealing plate has a peripheral edge fitted to the opening end of the case, and has a first inclined surface 16a that forms an acute angle ⁇ 1 with the first main surface at least at a part of the peripheral edge. (See FIG. 8).
- the first main surface 16b of the sealing plate is referred to as the outer surface of the sealing plate
- the second main surface of the sealing plate is referred to as the inner surface of the sealing plate.
- the open end of the case has a second slope 14a that comes into contact with the first slope.
- “contact” is a state in which the first slope and the second slope are in plane contact.
- the peripheral part of a sealing board and the opening edge part of a case are welded by the 1st slope and the 2nd slope.
- an angle (acute angle) formed by the outer peripheral surface 14b of the case side wall and the second slope is defined as ⁇ 2.
- ⁇ 2 (90 ⁇ 1) (degrees).
- the influence of dimensional errors can be mitigated by welding the peripheral edge portion of the sealing plate 16 and the upper end portion, for example, of the opening end portion of the case 14 with the inclined surfaces being brought into contact with each other. Further, by welding the slopes, a welded portion having a depth larger than that of a normal welded portion (see FIG. 9) can be formed.
- the depth of the welded portion is L12, but in the case of FIG. 8, the depth of the welded portion is longer than L12.
- angle (theta) 1 is preferably set to an angle within a range of 5 to 85 degrees.
- angle (theta) 1 can be set to an optimal angle within said range according to the thickness of a sealing board, or the thickness of a case.
- a more preferable range of the angle ⁇ 1 is 10 to 45 degrees.
- the angle ⁇ 1 is set to an angle in the range of 5 to 85 degrees, for example, it becomes easy to weld the peripheral edge of the sealing plate and the open end of the case. That is, if the angle ⁇ 1 is within the above range, as shown in FIG. 8, the laser beam is irradiated in a direction perpendicular to the outer surface of the sealing plate, so that the peripheral edge of the sealing plate and the opening end of the case The part can be welded. As a result, as in the case shown in FIG. 9, only the case or the laser head is moved two-dimensionally without any change in posture, and the peripheral edge of the sealing plate is moved around the entire circumference. It can be welded to the open end of. When irradiating laser light obliquely upward or in a direction perpendicular to the outer surface of the case (right side in FIG. 8), it is necessary to rotate either the case or the laser head or change their posture. Yes, position control becomes difficult.
- the thickness L11 of the portion of the case side wall adjacent to the second inclined surface 14a can be set to 0.1 to 3 mm, for example.
- the thickness L11 may coincide with the average thickness of the entire case, or only the thickness L11 of the portion adjacent to the second slope may be set to a thickness within the above range.
- the thickness L12 of the sealing plate adjacent to the first inclined surface 16a can be set to 0.1 to 4 mm, for example.
- the thickness L12 may also coincide with the average thickness of the entire sealing plate, or only the thickness L12 of the portion adjacent to the first slope 16a may be set to a thickness within the above range. .
- the first current collector preferably includes the first metal porous body.
- the first electrode is a positive electrode of a lithium ion capacitor or a non-aqueous electrolyte secondary battery, it is preferable to use a porous metal body containing aluminum as the first current collector. If the first electrode is a negative electrode of a lithium ion capacitor or a nonaqueous electrolyte secondary battery, it is preferable to use a metal porous body containing copper as the first current collector.
- a metal porous body having a high porosity having communication holes as a current collector.
- the metal porous body is manufactured, for example, by forming a metal layer on the surface of a foamed resin skeleton having communication holes such as foamed urethane, thermally decomposing the foamed resin, and further reducing the metal.
- the second current collector can also contain a second metal porous body.
- Each of the plurality of second current collectors can be provided with a tab-like second connection portion for electrically connecting to another adjacent second current collector.
- These second connection portions can be arranged so as to overlap in the stacking direction of the electrode group with the sheet-like second conductive spacer interposed therebetween, and can be fastened together by the second fastening member. it can.
- the first metal porous body and the second metal porous body only need to have a pore structure such that the surface area on which the active material is to be supported (hereinafter also referred to as an effective surface area) is larger than a simple metal foil or the like.
- an effective surface area the surface area on which the active material is to be supported
- Celmet registered trademark of Sumitomo Electric Industries, Ltd.
- aluminum cermet registered trademark of Sumitomo Electric Industries, Ltd.
- a metal porous body having a three-dimensional network shape and a hollow skeleton is most preferable because the effective surface area per unit volume can be remarkably increased.
- a nonwoven fabric, a punching metal, an expanded metal, etc. can be used as a 1st metal porous body and a 2nd metal porous body.
- Nonwoven fabric, cermet, and aluminum cermet are three-dimensional porous bodies, and punching metal and expanded metal are two-dimensional porous bodies.
- the metal porous body as described above has a large surface area, it can support a large amount of active material and can easily hold an electrolyte, and thus is considered suitable as an electrode for an electricity storage device.
- it is necessary to connect the current collectors of the same polarity in parallel.
- the electrode group 100 as shown in FIG. 12 is configured by alternately laminating a plurality of sheet-like positive electrodes 112 and a plurality of sheet-like negative electrodes 114 with a separator interposed therebetween.
- Each current collector is provided with a tab-shaped connecting portion 116.
- electrodes having the same polarity are electrically connected to each other by joining a plurality of connection portions 116 to each other.
- the connection part 116 is formed integrally with the main body of the current collector from the viewpoint of reducing the number of parts and the number of manufacturing steps. That is, the connection part 116 is the same material as the current collector.
- connection part integrally formed with the main body of the current collector is joined or fastened to another adjacent connection part by a fastening member with a conductive spacer interposed therebetween, for example.
- a rivet can be used as the fastening member.
- the connecting portions with a fastening member such as a rivet the structure and properties of the metal porous body are not greatly changed as in the case of joining by welding, and the durability is lowered. Can be prevented.
- a mechanical joining method using a fastening member such as a rivet it is possible to obtain joint strength several times that of a metallurgical joining method such as welding.
- first fastening member or second fastening member is not limited to a rivet, and may be any member or instrument that can mechanically join or fasten each connecting portion. It can be used as a fastening member. However, as will be described later, it is most preferable to use a rivet as such a fastening member.
- a through-hole through which the fastening member is passed is provided in the connecting portion, the fastening member is inserted into the through-hole, and the tip of the fastening member is crushed and engaged with the side surface of the connecting portion.
- the through-hole can be easily formed into a shape close to a perfect circle, for example, and the accuracy of the shape can be easily inspected. Therefore, it is possible to easily obtain desired durability by suppressing excessive concentration of stress. It is also possible to prevent shipment of defective products having poor durability.
- connection resistance between electrodes can be made small.
- a metal porous body having a certain thickness for example, 0.1 to 10 mm
- a certain thickness for example, 0.1 to 10 mm
- the interval between the connection portions of the plurality of electrodes having the same polarity is, for example, 1 mm or more.
- the connecting portions are directly joined by the fastening member, the deformation amount of each connecting portion 116 increases as shown in FIG. As a result, durability may be reduced.
- by arranging a conductive spacer between the connection portions of the plurality of electrodes it is possible to suppress deformation when adjacent connection portions are joined together. Thereby, durability of an electrode group can be improved.
- the first fastening member preferably contains the same type of metal element as the first current collector. Thereby, the erosion by the electrolyte etc. of a 1st fastening member can be suppressed. Therefore, the durability of the electrode group can be improved.
- the first electrode is a positive electrode of a lithium ion capacitor or a lithium ion battery
- the first current collector contains aluminum or an aluminum alloy and the first fastening member also contains aluminum or an aluminum alloy.
- the second fastening member also preferably contains the same type of metal as the second current collector. Thereby, the erosion by the electrolyte etc. of a 2nd fastening member can be suppressed. Therefore, the durability of the electrode group can be improved.
- the second electrode is a negative electrode of a lithium ion capacitor or a lithium ion battery
- the second current collector contains copper or a copper alloy and the second fastening member also contains copper or a copper alloy.
- the conductive spacer (the first conductive spacer or the second conductive spacer) may be formed from a material having sufficient conductivity and sufficient rigidity and toughness as the spacer. However, the conductive spacer preferably has a cushioning property (stress relaxation effect). At this time, the adhesiveness between the conductive spacer and each connection portion can be improved by applying an appropriate fastening pressure to the spacer between adjacent connection portions. Thereby, the connection resistance between electrodes can be made small.
- the conductive spacer preferably includes a metal porous body (third metal porous body or fourth metal porous body). Therefore, the same material as that used for the first metal porous body or the second metal porous body can be used for the third metal porous body or the fourth metal porous body. Furthermore, the metal foam (refer patent document 1) which added the foaming agent to the molten metal and was made to foam can also be used for a 3rd metal porous body or a 4th metal porous body. Metal foam is not suitable for use as a current collector because it has a high proportion of closed pores. However, a metal foam having many closed pores is useful as a spacer for obtaining cushioning properties.
- the compression ratio (minimum thickness after fastening by the fastening member / average thickness before fastening) between the connecting portions is preferably 1/10 to 9/10. More preferably, it is 10 to 7/10.
- the stress generated in the conductive spacer between the connecting portions is preferably 0.01 to 1 MPa on average, and more preferably 0.1 to 0.3 MPa.
- the conductive spacer (the first conductive spacer or the second conductive spacer) preferably has a chamfered portion at a corner corresponding to at least one of the sides in contact with the connecting portion.
- the radius of curvature R1 (see FIGS. 3A and 3B) of the chamfered portion is preferably 1 to 10 mm, for example, and more preferably 3 to 7 mm.
- stress may concentrate on a part of the connection portion.
- the stress applied to the connecting portion is dispersed. Thereby, durability of a connection part improves and durability of an electrical storage device also improves.
- a fastening member for fastening each connection portion to each other
- a rivet is preferable
- a dish rivet countersunk-head rivet
- a dish rivet it is possible to prevent the head (a large-diameter portion at one end in the axial direction) from protruding from the surface of the connection portion or the spacer when the connection portions are fastened together.
- a countersink hole or countersink having a shape corresponding to the shape of the head of the dish rivet is provided in the connection part or the spacer.
- bolts and nuts can be used as fastening members.
- the size of the fastening member can be easily reduced by using rivets.
- “loosening” may occur.
- a rivet is used, “loosening” does not occur. Therefore, a desired fastening state can be maintained for a long time.
- the rivet can easily reduce the size of the head.
- the fastening member is not limited to a shaft-shaped member.
- a clip-shaped member elastic member
- a plurality of connecting portions can be fastened to each other with clip-like fastening members so as to sandwich the laminated body of connecting portions from the outside.
- a clip-like fastening member can be used as an electrode lead, the number of members can be reduced.
- Examples of power storage devices include capacitors (capacitors) such as lithium ion capacitors and electric double layer capacitors, and nonaqueous electrolyte secondary batteries such as lithium ion batteries and sodium ion batteries.
- capacitors such as lithium ion capacitors and electric double layer capacitors
- nonaqueous electrolyte secondary batteries such as lithium ion batteries and sodium ion batteries.
- a packaging container or a metal can formed of a laminate film can be used.
- the electrolyte includes a salt of lithium ions and anions
- one of the first active material and the second active material is a first material that occludes and releases lithium ions
- the other is a second material (positive electrode active material) that adsorbs and desorbs anions.
- the first substance occludes and releases lithium ions by a Faraday reaction.
- the first material is, for example, a carbon material such as graphite, or an alloy-based active material such as Si, SiO, Sn, or SnO.
- the second substance adsorbs and desorbs anions by a non-Faraday reaction.
- the second substance is, for example, a carbon substance such as activated carbon or carbon nanotube.
- the second substance (positive electrode active material) may be a material that causes a Faraday reaction. Examples of such a material include metal oxides such as manganese oxide, ruthenium oxide, and nickel oxide, and conductive polymers such as polyacene, polyaniline, polythiol, and polythiophene.
- a capacitor in which a Faraday reaction occurs in both the first material and the second material is called a redox capacitor.
- the electrolyte includes a salt of an organic cation and an anion
- one of the first active material and the second active material is a third material that adsorbs and desorbs the organic cation.
- the other material includes a fourth material that adsorbs and desorbs anions.
- the third substance and the fourth substance both adsorb and desorb organic cations or anions by non-Faraday reaction.
- the third substance and the fourth substance are, for example, carbon substances such as activated carbon and carbon nanotubes.
- the electrolyte includes a salt of an alkali metal ion and an anion, and the first active material and the second active material both occlude and release alkali metal ions. Containing substances that That is, the Faraday reaction occurs in each of the first active material and the second active material.
- FIG. 1 the external appearance of the electrical storage device which concerns on this embodiment is shown with a perspective view.
- FIG. 2 is a partial cross-sectional view showing the internal structure when the electricity storage device is viewed from the front.
- 3A and 3B are cross-sectional views taken along lines IIIA and IIIB in FIG. 2, respectively.
- the power storage device 10 in the illustrated example is, for example, a lithium ion capacitor, and includes an electrode group 12, a case 14 that houses the electrode group 12 together with an electrolyte (not shown), and a sealing plate 16 that seals the opening end of the case 14. It has.
- the case 14 is square.
- the power storage device according to one embodiment of the present invention can be most suitably applied to a rectangular case as shown in the illustrated example.
- the electrode group 12 includes a plurality of sheet-like first electrodes 18 and a plurality of sheet-like second electrodes 20.
- the first electrode 18 and the second electrode 20 are alternately stacked with a sheet-like separator 21 interposed therebetween.
- the first electrode 18 includes a first current collector 22 and a first active material.
- the second electrode 20 includes a second current collector 24 and a second active material.
- One of the first electrode 18 and the second electrode 20 is a positive electrode, and the other is a negative electrode.
- the positive electrode includes a positive electrode current collector and a positive electrode active material.
- the negative electrode includes a negative electrode current collector and a negative electrode active material. Therefore, one of the first current collector 22 and the second current collector 24 is a positive electrode current collector, and the other is a negative electrode current collector.
- the first electrode 18 is shown as a positive electrode and the second electrode 20 is shown as a negative electrode in order to facilitate understanding of the invention. That is, the first current collector 22 is a positive electrode current collector, and the second current collector 24 is a negative electrode current collector. In FIGS. 3A and 3B, it is difficult to distinguish between the electrode and the current collector, and therefore, the electrode and the current collector are indicated by the same element.
- the first current collector 22 (positive electrode current collector) includes a first metal porous body
- the second current collector 24 (negative electrode current collector) includes a second metal porous body.
- the first metal is preferably aluminum or an aluminum alloy
- the second metal is preferably copper or a copper alloy.
- the thickness of the positive electrode current collector is preferably 0.1 to 10 mm.
- the thickness of the negative electrode current collector is also preferably 0.1 to 10 mm.
- the first current collector 22 (positive electrode current collector) has a large porosity (for example, 90% or more), has continuous pores, and contains almost no closed pores. Registered trademark) is particularly preferred.
- the second current collector 24 (negative electrode current collector) is particularly preferably a copper or nickel cermet (registered trademark of Sumitomo Electric Industries, Ltd.) for the same reason. Celmet or aluminum cermet will be described in detail later.
- the first current collector 22 has a tab-shaped first connection portion 26.
- the second current collector 24 can be provided with a tab-shaped second connection portion 28.
- Each connection part is preferably made of the same material as the main body of the current collector and formed integrally with the main body.
- a first conductive spacer 30 is disposed between the first connection portions 26 of the plurality of first current collectors 22.
- the second conductive spacer 32 can be disposed between the second connection portions 28 of the plurality of second current collectors 24.
- the ratio of the projected area of the first connection portion 26 (the area when viewed from the direction perpendicular to the main surface of the first current collector) to the projected area of the entire first current collector 22 is 0. 1 to 10%.
- the projected area of the first connection portion 26 or the length of the boundary line between the main body of the first current collector and the first connection portion can be determined according to the capacity of the power storage device.
- the boundary line is, for example, a straight line coaxial with the side of the first current collector provided with the first connection portion.
- the shape of the first connection portion 26 is not particularly limited, but may be a square having rounded corners.
- the first conductive spacer 30 can be formed of a plate-like member including a conductor (for example, a metal or a carbon material). However, it is preferable to form the first conductive spacer 30 from a metal porous body (third metal porous body) in order to improve the adhesion with the first connection portion 26, and in particular, the same as the first current collector 22. It is preferably formed from a material (for example, aluminum cermet). Similarly, the second conductive spacer can also be formed of a plate-like member including a conductor (for example, a metal or a carbon material). The second conductive spacer 32 is also preferably formed from a metal porous body (fourth metal porous body), and particularly preferably formed from the same material as the second current collector 24 (for example, copper cermet).
- the separator 21 is preferably formed in a bag shape so as to accommodate the first electrode 18 (positive electrode).
- the bag of the separator 21 can be formed, for example, by folding the rectangular separator 21 along the longitudinal center line 21c and gluing the edges 21b other than the opening end.
- the bag-shaped separator 21 can be provided with an open end 21a for projecting the connecting portion to the outside. Thereby, it is possible to prevent an internal short circuit from occurring when the positive electrode active material falls off from the first current collector 22.
- the first connecting portion 26 of the first electrode 18 can be provided with a through hole 36 for inserting a first fastening member 34 that is, for example, a rivet.
- a first fastening member 34 that is, for example, a rivet.
- An appropriate number of through holes 36 can be provided.
- the first connection portion 26 is formed on one side of the side of the first current collector 22 where the first connection portion 26 is formed.
- the first conductive spacer 30 can also be provided with a through hole 37 for inserting the first fastening member 34 at a position overlapping the through hole 36 of the first connection portion 26.
- FIG. 5 is a front view of the second electrode 20 when viewed from the same direction as the first electrode 18 shown in FIG.
- the second connection portion 28 of the second electrode 20 can be provided with a through hole 36 for inserting the second fastening member 38 that is a rivet.
- the second conductive spacer 32 can also be provided with a through hole 37 for inserting the second fastening member 38 at a position overlapping the through hole 36 of the second connecting portion 28.
- the second connection portion 28 is formed near the other side of the side where the second connection portion 28 of the second current collector 24 is formed.
- the outer shape of the main body of the second electrode 20 is formed to be approximately the same size as the outer shape of the bag-shaped separator 21. That is, the outer shape of the negative electrode is made larger than the outer shape of the positive electrode. Thereby, the whole positive electrode can be made to oppose a negative electrode through a separator.
- first fastening member 34 is formed of the same conductive material as that of the first current collector 22 in terms of obtaining high corrosion resistance.
- second fastening member 38 is preferably formed of the same conductive material as that of the second current collector 24.
- first connection portions 26 of the plurality of first electrodes 18 are arranged so as to overlap in the stacking direction of the electrode group 12, their through holes 36 are also arranged in a straight line.
- the first conductive spacers 30 are also arranged so that the through holes 37 are aligned with the corresponding through holes 36.
- the sealing plate 16 has a first external terminal 40 electrically connected to the plurality of first electrodes 18 and a second external terminal 42 electrically connected to the plurality of second electrodes 20.
- a safety valve 44 is provided at the center of the sealing plate 16, and a liquid stopper 48 that closes the liquid injection hole 46 is attached at a position near the first external terminal 40 (see FIG. 6).
- FIG. 6A is an enlarged view showing a connection structure between the first electrode and the first external terminal (first terminal plate).
- FIG. 6B is an enlarged view showing a connection structure between the second electrode and the second external terminal (second terminal plate).
- the first external terminal 40 is formed near one end of a first terminal plate 50 made of, for example, a rectangular plate-shaped conductor.
- a through hole is formed in the sealing plate 16, and a through hole 54 is also formed near the other end of the first terminal plate 50 so as to correspond to the through hole.
- the first terminal plate 50 is fixed to the sealing plate 16 by a third fastening member (first rivet) 52 inserted through the through hole 54.
- the first terminal plate 50 and the third fastening member 52 are electrically insulated from the sealing plate 16 by a plate-like gasket 58 and a ring-like gasket 60 each having a through hole through which the third fastening member 52 is inserted.
- the plate-shaped gasket 58 and the ring-shaped gasket 60 constitute a first gasket.
- the first lead 62 for electrically connecting the first electrode 18 and the first external terminal 40 is joined to the end of the third fastening member 52 inside the case 14 (see FIG. 3A).
- the second electrode 20 and the second external terminal 42 are electrically connected by the second lead 64 (see FIG. 3B).
- the second external terminal 42 is formed near one end of the second terminal plate 50A made of, for example, a rectangular plate-shaped conductor.
- a through hole is formed in the sealing plate 16, and a through hole 54A is also formed near the other end of the second terminal plate 50A so as to correspond to this.
- the second terminal plate 50A is fixed to the sealing plate 16 by a fourth fastening member (second rivet) 80 inserted through the through hole 54A.
- the second terminal plate 50A and the fourth fastening member 80 are electrically insulated from the sealing plate 16 by a plate-like gasket 58A having a through-hole through which the fourth fastening member 80 is inserted and a ring-like gasket 60A.
- the plate-shaped gasket 58A and the ring-shaped gasket 60A constitute a second gasket.
- the second lead 64 for electrically connecting the second electrode 20 and the second external terminal 42 is joined to the end of the fourth fastening member 80 inside the case 14 (see FIG. 3B).
- the thickness of the second lead is the same as that of the first lead.
- FIG. 7 shows an example of the first lead 62 by a front view (a), a top view (b), and a side view (c). Since the configuration of the second lead 64 is the same as that of the first lead 62, illustration and description thereof are omitted.
- the first lead 62 in the illustrated example is a member having an L-shaped cross section, and has a plate-like first portion 62a and a second portion 62b that are perpendicular to each other.
- the first portion 62 a is a portion arranged in parallel with the sealing plate 16, and has a joining region 62 c for joining the third fastening member 52 at the center thereof.
- a fitting hole 62d into which a convex portion formed on the inner peripheral edge of the case 14 of the first lead 62 is fitted is formed inside the joining region 62c.
- the third fastening member 52 before deformation and the joining region 62c of the first lead 62 are joined by welding, for example.
- the first connection member 70 including the third fastening member 52 and the first lead 62 before being deformed and for connecting the first electrode 18 and the first external terminal 40 is formed.
- the first connection member 70 can be manufactured on a line different from the assembly line of the electricity storage device 10 and can be supplied as one component.
- the second portion 62 b is a portion that is disposed perpendicular to the sealing plate 16, and the first lead 62 is electrically connected to the first electrode 18 mainly by the second portion 62 b coming into contact with the first connection portion 26. Connected.
- the second portion 62b has one or more through holes 62e through which the first fastening member 34 is inserted.
- the first fastening member 34 inserted through the through hole 62e is fixed in a state where the second portion 62b is in contact with the first connecting portion 26. Thereby, the first lead 62 is fixed to the first connection portions 26 of the plurality of first electrodes 18.
- the opening area of the through hole 62e can be set to 0.005 to 4 cm 2 , for example.
- the opening shape is not particularly limited, but can be circular or polygonal (for example, regular hexagon).
- the number of through holes 62e provided in the second portion 62b is not particularly limited, but may be a number in the range of 1 to 10.
- the first lead 62 can be fixed to the first connection portion 26 by inserting the first fastening members 34 one by one into the through hole 62e.
- the first lead 62 preferably has a thickness of 0.1 to 2 mm. Thereby, a certain degree of rigidity can be imparted to the first lead 62.
- the 1st connection part 26 has cushioning properties (deformability). Therefore, the adhesion between the first connection portion 26 and the second portion 62b of the first lead 62 is easily ensured.
- the third fastening member (first rivet) 52 includes a first large-diameter portion 52a disposed inside the sealing plate 16 and through holes of the respective members (sealing plate 16, first terminal plate 50, gaskets 58, 60).
- the first enlarged-diameter portion 52b inserted through the first plate 52 and the first head portion 52c disposed outside the sealing plate 16 are provided.
- the first terminal is obtained by caulking the sealing plate 16, the first terminal plate 50, and the first gasket (gaskets 58, 60) together in a state where the third fastening member 52 is inserted through each of the through holes.
- the plate 50 is fixed on the outer surface of the sealing plate 16.
- the first enlarged diameter portion 52b is enlarged in internal cavity and thereby enlarged in diameter.
- the first head 52c is, for example, kidnapped when the third fastening member 52 is caulked, so that the first terminal plate 50, the sealing plate 16, and the gasket 58, in cooperation with the first large diameter portion 52a. It deform
- the first electrode 18 and the first external terminal 40 are electrically connected by the first connection member 70 having the third fastening member 52. For this reason, each member is crimped in the state which inserted the 3rd fastening member 52 in the through-hole of each member (The sealing board 16, the 1st terminal board 50, the gaskets 58 and 60) (the 1st enlarged diameter part 52b and the 1st
- the first terminal plate 50 can be fixed to the sealing plate 16 in a state where the first terminal plate 50 is electrically insulated from the sealing plate 16 only by deforming the head 52c.
- the 1st electrode 18 and the 1st external terminal 40 can also be electrically connected simultaneously by only performing such one process. Therefore, the first electrode 18 and the first external terminal 40 can be electrically connected and the first external terminal 40 can be installed on the sealing plate 16 by a very simple process. Thereby, manufacture of the electrical storage device 10 can be facilitated and manufacturing time can be shortened.
- the above process is a mechanical joining method similar to that for connecting electrodes having the same polarity. Therefore, in the assembly line of the electricity storage device 10, the electricity storage device 10 can be assembled without using any resistance welding machine. Thereby, an assembly line can also be simplified.
- the fourth fastening member (second rivet) 80 includes a second large-diameter portion 80a disposed inside the sealing plate 16, and through-holes of the respective members (sealing plate 16, second terminal plate 50A, gaskets 58A, 60A). And a second head 80c disposed outside the sealing plate 16. In the state where the fourth fastening member 80 is inserted through each of the through holes, the sealing plate 16, the second terminal plate 50A, and the second gasket (gaskets 58A and 60A) are caulked together to form the second terminal.
- the plate 50 ⁇ / b> A is fixed on the outer surface of the sealing plate 16.
- the second enlarged diameter portion 80b is enlarged in internal cavity and thereby enlarged in diameter.
- the second head portion 80c is, for example, kidnapped so that the second terminal plate 50A, the sealing plate 16, and the gasket 58A, in cooperation with the second large diameter portion 80a. It is deformed so as to sandwich 60A.
- the above effect it is the same as that of having explained about the 1st connecting member.
- FIG. 8 shows an enlarged part of the opening end of the case 14.
- the end portion (peripheral portion) of the sealing plate 16 has an inclined surface 16a (first inclined surface) that forms an acute angle ⁇ 1 with the outer surface 16b of the sealing plate.
- the upper end portion of the side wall of the case 14 forming the opening end portion has an inclined surface 14a (second inclined surface) that forms an acute angle ⁇ 2 with respect to the outer surface 14b of the case 14.
- the peripheral part of the sealing board 16 and the opening edge part of the case 14 are welded by the slopes.
- ⁇ 2 (90 ⁇ 1) (degrees).
- the opening end portion of the case 14 and the peripheral portion of the sealing plate 16 are always welded to the peripheral portion of the sealing plate 16 by the inclined surface 14a and the inclined surface 16a. Both can be welded in a state in which sufficient adhesion is secured.
- a sealing plate 16 having a side end surface (circumferential end surface) perpendicular to the outer surface (or inner surface) is welded to the inner surface of the opening end of the case 14.
- the angle ⁇ 1 is preferably an angle within a range of 5 (degrees) ⁇ ⁇ 1 ⁇ 85 (degrees). More preferably, 10 (degrees) ⁇ ⁇ 1 ⁇ 45.
- the laser is not directed obliquely from the upper side of the case 14 but substantially vertically upward (the method of the outer surface of the sealing plate 16). Both can be welded by irradiation from the (linear direction). It is not easy to accurately irradiate a laser beam to the welded portion from an oblique direction because it is difficult to ensure the accuracy of image recognition and the relative positional accuracy of the case and the sealing plate. On the other hand, if the laser is irradiated from vertically above, the end portion can be easily recognized, so that welding can be easily performed. Further, since the peripheral edge of the sealing plate can be welded to the open end of the case over the entire circumference only by two-dimensional movement of the case or the laser head, the manufacture of the electricity storage device is facilitated.
- the metal porous body preferably has a three-dimensional network shape and a hollow skeleton. Since the skeleton has a cavity inside, the metal porous body is extremely lightweight while having a bulky three-dimensional structure.
- a metal porous body can be formed by plating a resin porous body having continuous voids with the metal constituting the current collector and further decomposing or dissolving the internal resin by heat treatment or the like.
- a three-dimensional network skeleton is formed by the plating process, and the inside of the skeleton can be made hollow by decomposition and dissolution of the resin.
- the resin porous body is not particularly limited as long as it has continuous voids, and a resin foam, a resin nonwoven fabric, or the like can be used. After the heat treatment, components (resin, decomposition product, unreacted monomer, additive contained in the resin, etc.) remaining in the skeleton may be removed by washing or the like.
- the resin constituting the resin porous body examples include thermosetting resins such as thermosetting polyurethane and melamine resin; thermoplastic resins such as olefin resin (polyethylene, polypropylene and the like) and thermoplastic polyurethane.
- thermosetting resins such as thermosetting polyurethane and melamine resin
- thermoplastic resins such as olefin resin (polyethylene, polypropylene and the like)
- thermoplastic polyurethane thermoplastic polyurethane.
- the plating process is not limited as long as a metal layer functioning as a current collector can be formed on the surface of the resin porous body (including the surface in the continuous void).
- a known plating process method such as an electrolytic plating method or a molten salt plating method may be used. Etc. can be adopted.
- Etc. can be adopted.
- a three-dimensional network metal porous body corresponding to the shape of the resin porous body is formed.
- the conductive layer may be formed on the surface of the resin porous body by electroless plating, vapor deposition, sputtering, or by applying a conductive agent.
- the resin porous body is immersed in a dispersion containing the conductive agent. May be formed.
- the resin porous body is removed by heating, so that a cavity is formed inside the skeleton of the metal porous body and becomes hollow.
- the width of the cavity inside the skeleton (the width w f of the cavity in FIG. 10 described later) is an average value, for example, 0.5 to 5 ⁇ m, preferably 1 to 4 ⁇ m or 2 to 3 ⁇ m.
- the resin porous body can be removed by performing a heat treatment while appropriately applying a voltage as necessary.
- the plated porous body may be immersed in a molten salt plating bath, and heat treatment may be performed while applying a voltage.
- the metal porous body has a three-dimensional network structure corresponding to the shape of the resin foam.
- each of the current collectors has a large number of cell-shaped holes, and the cell-shaped holes have continuous voids that are continuous with each other.
- An opening (or window) is formed between adjacent cellular holes. It is preferable that the air holes communicate with each other through this opening.
- the shape of the opening (or window) is not particularly limited, and is, for example, a substantially polygonal shape (such as a substantially triangular shape, a substantially square shape, a substantially pentagonal shape, and / or a substantially hexagonal shape).
- the substantially polygonal shape is used in the meaning including a polygon and a shape similar to the polygon (for example, a shape in which the corners of the polygon are rounded or a shape in which the sides of the polygon are curved).
- FIG. 1 A schematic diagram of the skeleton of the porous metal body is shown in FIG.
- the porous metal body has a plurality of cellular holes 101 surrounded by a metal skeleton 102, and a substantially polygonal opening (or window) 103 is formed between the adjacent holes 101.
- the openings 103 communicate with each other between the adjacent holes 101, whereby the current collector has a continuous gap.
- the metal skeleton 102 is formed in three dimensions so as to form cellular holes and connect the holes, thereby forming a three-dimensional network structure.
- the metal porous body has a very high porosity and a large specific surface area. That is, a large amount of active material can be attached to a wide area including the surface in the void. In addition, since the contact area between the porous metal body and the active material can be increased and the porosity can be increased while filling a large amount of active material in the voids, the active material can be effectively used.
- conductivity is usually increased by adding a conductive additive.
- the metal porous body as described above as the positive electrode current collector it is easy to ensure high conductivity even if the addition amount of the conductive auxiliary agent is reduced. Therefore, the rate characteristics and energy density (and capacity) of the battery can be increased more effectively.
- the specific surface area (BET specific surface area) of the metal porous body is, for example, 100 to 700 cm 2 / g, preferably 150 to 650 cm 2 / g, more preferably 200 to 600 cm 2 / g.
- the porosity of the metal porous body is, for example, 40 to 99% by volume, preferably 60 to 98% by volume, and more preferably 80 to 98% by volume.
- the average pore diameter in the three-dimensional network structure is, for example, 50 to 1000 ⁇ m, preferably 100 to 900 ⁇ m, and more preferably 350 to 900 ⁇ m.
- the average pore diameter is smaller than the thickness of the metal porous body (or electrode). Note that the skeleton of the metal porous body is deformed by rolling, and the porosity and the average pore diameter are changed.
- the ranges of the porosity and the average pore diameter are the porosity and the average pore diameter of the metal porous body before rolling (before filling the mixture).
- Examples of the metal constituting the positive electrode current collector of the lithium ion capacitor or the nonaqueous electrolyte secondary battery (the metal to be plated) include at least one selected from aluminum, aluminum alloy, nickel, and nickel alloy.
- Examples of the metal (the metal to be plated) constituting the negative electrode current collector of the lithium ion capacitor or the nonaqueous electrolyte secondary battery include at least one selected from copper, copper alloy, nickel, and nickel alloy.
- the same metal (for example, copper, copper alloy) as described above can be used for the electrode current collector of the electric double layer capacitor.
- FIG. 11 is a schematic cross-sectional view showing a state in which the electrode mixture is filled in the voids of the porous metal body of FIG.
- the cell-like pores 101 are filled with the electrode mixture 104 and adhere to the surface of the metal skeleton 102 to form an electrode mixture layer having a thickness w m .
- the internal skeletal 102 of the metal porous body is formed a cavity 102a having a width w f.
- voids remain inside the electrode mixture layer in the cellular holes 101.
- the electrode is formed by rolling the metal porous body in the thickness direction as necessary.
- FIG. 11 shows a state before rolling.
- the skeleton 102 is slightly crushed in the thickness direction, and the voids inside the electrode mixture layer in the pores 101 and the cavities in the skeleton 102 are crushed. Even after the metal porous body is rolled, the gaps inside the electrode mixture layer remain to some extent, thereby increasing the porosity of the electrode.
- the positive electrode or the negative electrode is formed, for example, by filling a gap in the metal porous body obtained as described above with an electrode mixture and, if necessary, compressing the current collector in the thickness direction.
- the electrode mixture includes an active material as an essential component, and may include a conductive additive and / or a binder as an optional component.
- the thickness w m of the mixture layer formed by filling the mixture in the cell-like pores of the current collector is, for example, 10 to 500 ⁇ m, preferably 40 to 250 ⁇ m, more preferably 100 to 200 ⁇ m. is there.
- the thickness w m of the mixture layer is 5 to 40% of the average pore diameter of the cell-like pores so that a void can be secured inside the mixture layer formed in the cell-like pores. Preferably, it is 10 to 30%.
- the positive electrode active material of the nonaqueous electrolyte secondary battery a material that occludes and releases (inserts and desorbs) alkali metal ions can be used.
- Such materials include metal chalcogen compounds (sulfides, oxides, etc.), alkali metal-containing transition metal oxides (lithium-containing transition metal oxides, sodium-containing transition metal oxides), alkali metal-containing transition metal phosphates. (Such as iron phosphate having an olivine structure).
- These positive electrode active materials can be used individually by 1 type or in combination of 2 or more types.
- a material that occludes and releases (inserts and desorbs) alkali metal ions such as lithium ions can be used.
- examples of such materials include carbon materials, spinel type lithium titanium oxide, spinel type sodium titanium oxide, silicon oxide, silicon alloy, tin oxide, and tin alloy.
- Examples of the carbon material include graphite, graphitizable carbon (soft carbon), non-graphitizable carbon (hard carbon), and the like.
- a first carbon material that adsorbs and desorbs anions can be used as the positive electrode active material of the lithium ion capacitor.
- a second carbon material that adsorbs and desorbs organic cations can be used as the active material of one electrode of the electric double layer capacitor, and a third material that adsorbs and desorbs anions as the active material of the other electrode.
- Carbon material can be used.
- the first to third carbon materials include carbon materials such as activated carbon, graphite, graphitizable carbon (soft carbon), and non-graphitizable carbon (hard carbon).
- the type of the conductive auxiliary agent is not particularly limited, and examples thereof include carbon black such as acetylene black and ketjen black; conductive fiber such as carbon fiber and metal fiber; and nanocarbon such as carbon nanotube.
- the amount of the conductive auxiliary agent is not particularly limited, and is, for example, 0.1 to 15 parts by mass, preferably 0.5 to 10 parts by mass per 100 parts by mass of the active material.
- the type of the binder is not particularly limited.
- a fluorine resin such as polyvinylidene fluoride (PVDF) or polytetrafluoroethylene
- a chlorine-containing vinyl resin such as polyvinyl chloride
- a polyolefin resin such as styrene butadiene rubber
- Pyrrolidone polyvinyl alcohol
- cellulose derivatives such as carboxymethyl cellulose (cellulose ether and the like), polysaccharides such as xanthan gum, and the like
- the amount of the binder is not particularly limited, and is, for example, 0.5 to 15 parts by mass, preferably 0.5 to 10 parts by mass, and more preferably 0.7 to 8 parts by mass per 100 parts by mass of the active material.
- the thicknesses of the first electrode 18 and the second electrode 20 are 0.2 mm or more, preferably 0.5 mm or more, and more preferably 0.7 mm or more.
- the thicknesses of the first electrode 18 and the second electrode 20 are 5 mm or less, preferably 4.5 mm or less, more preferably 4 mm or less or 3 mm or less. These lower limit values and upper limit values can be arbitrarily combined.
- the thicknesses of the first electrode 18 and the second electrode 20 may be 0.5 to 4.5 mm or 0.7 to 4 mm.
- the separator 21 has ion permeability and is interposed between the first electrode 18 and the second electrode 20 to prevent short circuit between them.
- the separator 21 has a porous structure and allows ions to pass through by holding an electrolyte in the pores.
- a microporous film, a nonwoven fabric (including paper), or the like can be used.
- polyolefin such as polyethylene and polypropylene
- polyester such as polyethylene terephthalate
- polyamide polyamide
- polyimide polyimide
- cellulose glass fiber and the like
- the thickness of the separator 21 is, for example, about 10 to 100 ⁇ m.
- the electrolyte of the lithium ion capacitor includes a salt of lithium ions and anions (first anions).
- first anion examples include a fluorine-containing acid anion (PF 6 ⁇ , BF 4 ⁇ , etc.), a chlorine-containing acid anion (ClO 4 ⁇ ), a bis (oxalate) borate anion (BC 4 O 8 ⁇ ), a bissulfonylamide anion, Examples thereof include trifluoromethanesulfonate ion (CF 3 SO 3 ⁇ ).
- the electrolyte of the electric double layer capacitor includes a salt of an organic cation and an anion (second anion).
- Organic cations include tetraethylammonium ion (TEA + ), triethylmonomethylammonium ion (TEMA + ), 1-ethyl-3-methylimidazolium ion (EMI + ), N-methyl-N-propylpyrrolidinium ion (MPPY +).
- examples of the second anion include the same as the first anion.
- the electrolyte of the nonaqueous electrolyte secondary battery includes a salt of an alkali metal ion and an anion (third anion).
- the electrolyte of a lithium ion battery includes a salt of lithium ions and anions (third anions).
- the electrolyte of a sodium ion battery contains the salt of a sodium ion and an anion (3rd anion). Examples of the third anion include the same as the first anion.
- the electrolyte may contain a nonionic solvent or water that dissolves the above salt, or may be a molten salt containing the above salt.
- a nonionic solvent for example, organic solvents such as organic carbonates and lactones can be used.
- the electrolyte contains a molten salt, 90% by mass or more of the electrolyte is preferably occupied by a salt (an ionic substance composed of an anion and a cation) from the viewpoint of improving heat resistance.
- the cation constituting the molten salt is preferably an organic cation.
- organic cations include nitrogen-containing cations; sulfur-containing cations; phosphorus-containing cations.
- anion constituting the molten salt a bissulfonylamide anion is preferable.
- bis (fluorosulfonyl) amide anion ((N (SO 2 F) 2 ⁇ ) (FSA ⁇ : bis (fluorosulfonyl) amideanion)); bis (trifluoromethylsulfonyl) amide anion (N (SO 2 CF 3 ) 2 ⁇ ) (TFSA ⁇ : bis (trifluoromethylsulfonyl) amideanion), (fluorosulfonyl) (trifluoromethylsulfonyl) amide anion (N (SO 2 F) (SO 2 CF 3 ) ⁇ ) (PFSA ⁇ : bis (fluorosulfonyl) (trifluoromethylsulfonyl) amideanion) and the like are preferable.
- nitrogen-containing cations examples include quaternary ammonium cations, pyrrolidinium cations, pyridinium cations, imidazolium cations, and the like.
- Examples of the quaternary ammonium cation include tetramethylammonium cation, ethyltrimethylammonium cation, hexyltrimethylammonium cation, ethyltrimethylammonium cation (TEA + : ethyltrimethylammoniumcation), and methyltriethylammonium cation (TEMA + : methyltriethylammoniumcation). (Tetra C 1-10 alkyl ammonium cation, etc.).
- Examples of the pyrrolidinium cation include 1,1-dimethylpyrrolidinium cation, 1,1-diethylpyrrolidinium cation, 1-ethyl-1-methylpyrrolidinium cation, and 1-methyl-1-propylpyrrolidinium cation.
- MPPY + 1-methyl-1-propylpyrrolidiniumcation
- MBPY + 1-butyl-1-methylpyrrolidiniumcation
- 1-ethyl-1-propylpyrrolidinium cation etc.
- pyridinium cations include 1-alkylpyridinium cations such as 1-methylpyridinium cation, 1-ethylpyridinium cation, and 1-propylpyridinium cation.
- imidazolium cation examples include 1,3-dimethylimidazolium cation, 1-ethyl-3-methylimidazolium cation (EMI + ), 1-methyl-3-propylimidazolium cation, 1 -Butyl-3-methylimidazolium cation (BMI + : 1-buthyl-3-methylimidazoliumcation), 1-ethyl-3-propylimidazolium cation, 1-butyl-3-ethylimidazolium cation and the like.
- EMI + 1,3-dimethylimidazolium cation
- 1-ethyl-3-methylimidazolium cation 1-ethyl-3-methylimidazolium cation
- BMI + 1-buthyl-3-methylimidazoliumcation
- 1-ethyl-3-propylimidazolium cation 1-butyl-3-ethylimidazolium cation and
- sulfur-containing cation examples include tertiary sulfonium cations such as trialkylsulfonium cations such as trimethylsulfonium cation, trihexylsulfonium cation, and dibutylethylsulfonium cation (for example, tri-C 1-10 alkylsulfonium cation). .
- tertiary sulfonium cations such as trialkylsulfonium cations such as trimethylsulfonium cation, trihexylsulfonium cation, and dibutylethylsulfonium cation (for example, tri-C 1-10 alkylsulfonium cation).
- Phosphorus-containing cations include quaternary phosphonium cations, for example, tetraalkylphosphonium cations such as tetramethylphosphonium cation, tetraethylphosphonium cation, tetraoctylphosphonium cation (for example, tetra C 1-10 alkylphosphonium cation); triethyl (methoxymethyl) ) Alkyl (alkoxyalkyl) phosphonium cations such as phosphonium cation, diethylmethyl (methoxymethyl) phosphonium cation, trihexyl (methoxyethyl) phosphonium cation (for example, tri-C 1-10 alkyl (C 1-5 alkoxy C 1-5 alkyl)) Phosphonium cation, etc.).
- tetraalkylphosphonium cations such as tetramethylphosphonium cation, te
- An electrode group having a first electrode, a second electrode, and a separator for electrically insulating the first electrode and the second electrode;
- Electrolyte A bottomed case having an open end, which accommodates the electrode group and the electrolyte;
- a sealing plate having a first main surface facing the outside of the case and a second main surface facing the inside of the case, and sealing the opening end of the case;
- the first electrode includes a sheet-like first current collector and a first active material carried on the first current collector
- the second electrode includes a sheet-like second current collector and a second active material carried on the second current collector,
- the first electrode and the second electrode are stacked with the separator sandwiched between the first electrode and the second electrode
- the sealing plate has a peripheral portion that fits into the opening end portion of the case, and has a first inclined surface that forms an acute angle ⁇ 1 with the first main surface at least at a part of the peripheral portion.
- the opening end portion of the case has a second slope that contacts the first slope
- a first electrode comprising a sheet-like first current collector and a first active material carried on the first current collector;
- a second electrode comprising a sheet-like second current collector and a second active material carried on the second current collector;
- Electrolyte A bottomed case having an open end, which accommodates the electrode group and the electrolyte;
- a sealing plate and a method of manufacturing an electricity storage device comprising: (I) forming a first slope that forms an acute angle ⁇ 1 with the first main surface on at least a part of the peripheral edge of the sealing plate; (Ii) forming a second slope to be in contact with the first slope at the opening end of the case; (Iii) In a state where the first slope and the second slope are in contact with each other, a portion of
- a first electrode comprising a sheet-like first current collector and a first active material carried on the first current collector;
- a second electrode comprising a sheet-like second current collector and a second active material carried on the second current collector;
- a separator for electrically insulating the first electrode and the second electrode;
- Electrolyte A bottomed case having an open end, which accommodates the electrode group and the electrolyte;
- a method of manufacturing an electricity storage device comprising: a first main surface facing the outside of the case; and a second main surface facing the inside of the case; and a sealing plate for sealing the opening end.
- the sealing plate having a peripheral edge portion that fits with an opening end portion of the case and having a first inclined surface that forms an acute angle ⁇ 1 with the first main surface at least at a part of the peripheral edge portion is prepared. And a process of (Ii) preparing the case having a second slope to be brought into contact with the first slope at the opening end; (Iii) In a state where the first slope and the second slope are in contact with each other, a portion of the sealing plate where the first slope is formed is 90 ° ⁇ 5 ° with respect to the first main surface. Irradiating a laser beam from a direction to weld the peripheral edge portion of the sealing plate and the open end portion of the case to each other.
- the present invention can be widely applied to power storage devices such as lithium ion batteries, sodium ion batteries, lithium ion capacitors, and electric double layer capacitors.
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Abstract
Description
本出願は、2013年9月18日出願の日本出願第2013-193565号、2013年9月24日出願の日本出願第2013-197132号、2013年10月7日出願の日本出願第2013-210482号に基づく優先権を主張し、前記日本出願に記載された全ての記載内容を援用するものである。
電解質と、
前記電極群と前記電解質とを収容する、開口端部を有する有底のケース(a bottom-closed case having an open edge)と、
前記ケースの外側に面する第1主面および前記ケースの内側に面する第2主面を有し、前記ケースの前記開口端部を封口する封口板、とを具備し、
前記第1電極は、シート状の第1集電体と、前記第1集電体に担持された第1活物質とを含んでおり、
前記第2電極は、シート状の第2集電体と、前記第2集電体に担持された第2活物質とを含んでおり、
前記第1電極と、前記第2電極とは、前記第1電極と前記第2電極との間に前記セパレータを挟んだ状態で積層されており、
前記封口板は、前記ケースの前記開口端部に嵌合する周縁部を有し、かつ前記周縁部の少なくとも一部分に、前記第1主面との間に鋭角θ1を成す第1斜面を有しており、
前記ケースの前記開口端部は、前記第1斜面と当接する第2斜面を有しており、
前記封口板の前記周縁部と前記ケースの前記開口端部とが、前記第1斜面と前記第2斜面とで溶接されている、蓄電デバイスを提供する。
電解質と、
前記電極群と前記電解質とを収容する、開口端部を有する有底のケースと、
前記ケースの外側に面する第1主面および前記ケースの内側に面する第2主面を有し、前記ケースの前記開口端部に嵌合する周縁部を有し、前記周縁部の少なくとも一部分に、前記第1主面との間に鋭角θ1を成す第1斜面を有し、かつ前記ケースの前記開口端部を封口する封口板、とを具備し、
前記第1電極は、シート状の第1集電体と、前記第1集電体に担持された第1活物質とを含んでおり、
前記第2電極は、シート状の第2集電体と、前記第2集電体に担持された第2活物質とを含んでおり、
前記第1電極と、前記第2電極とは、前記第1電極と前記第2電極との間に前記セパレータを挟んだ状態で積層されており、
前記封口板を前記ケースの前記開口端部に溶接して取り付けた封口構造を有し、
前記ケースの前記開口端部は、溶接される前、前記第1斜面と当接する第2斜面を有しており、
前記封口構造は、前記第1斜面と前記第2斜面とを当接させた状態で、前記封口板の前記周縁部と前記ケースの前記開口端部とを互いに溶接することで、形成されている、蓄電デバイスを提供する。
本発明の一局面に係る蓄電デバイスは、第1電極と、第2電極と、第1電極と第2電極とを電気的に絶縁するセパレータとを有する電極群と、電解質と、電極群と電解質とを収容する、開口端部を有する有底のケースと、その開口端部を封口する封口板と、を具備する。封口板は、ケースの開口端部を封口した状態でケースの外側に面する第1主面16b(図8参照)およびケースの内側に面する第2主面16cを有する。
また、斜面同士を溶接することで、通常の溶接部(図9参照)よりも奥行きが大きい溶接部を形成することができる。図9の場合には溶接部の奥行きは、L12であるが、図8の場合には、溶接部の奥行きは、L12よりも長くなる。その結果、溶接の際のスパッタなどに起因する異物がケースの内部に侵入するのを防止することができる。これにより、所望の性能を有する蓄電デバイスを、より安定的に製造することができる。
このとき、鋭角θ1は、5~85度の範囲内の角度に設定するのが好ましい。なお、角度θ1は、封口板の厚みや、ケースの厚みに応じて、上記の範囲内で最適な角度に設定することができる。角度θ1のより好ましい範囲は、10~45度である。
各集電体には、タブ状の接続部116が設けられている。図13に示すように、複数の接続部116を互いに接合することで、同極性の電極同士が電気的に接続されている。接続部116は、部品点数および製造工数の削減を図る観点から、集電体の本体と一体的に形成される。つまり、接続部116は、集電体と同じ材質である。
なお、後述するように、そのような締結部材(第1締結部材または第2締結部材)は、リベットに限定されず、各接続部を機械的に接合、ないしは締結し得る部材または器具であれば、それを締結部材として使用することができる。ただし、後述するように、そのような締結部材としては、リベットを使用することが最も好ましい。
軸状の締結部材であれば、接続部に締結部材を通す貫通孔を設け、貫通孔に締結部材を挿通させ、締結部材の先端を押し潰して接続部の側面に係合させてかしめることが考えられる。貫通孔は、例えば真円に近い形状とすることも容易であり、その形状の精度を検査することも容易である。したがって、応力の過度の集中を抑制して、容易に所望の耐久性を得ることができる。また、耐久性に劣る不良品の出荷を防止することもできる。
例えば第1電極がリチウムイオンキャパシタやリチウムイオン電池の正極であれば、第1集電体がアルミニウムまたはアルミニウム合金を含むとともに、第1締結部材もアルミニウムまたはアルミニウム合金を含むことが好ましい。
第2締結部材も、第2集電体と同種の金属を含むことが好ましい。これにより、第2締結部材の電解質などによる浸食を抑えることができる。したがって、電極群の耐久性を向上させることができる。
例えば第2電極がリチウムイオンキャパシタやリチウムイオン電池の負極であれば、第2集電体が銅または銅合金を含むとともに、第2締結部材も銅または銅合金を含むことが好ましい。
以下、図面を参照しながら、本発明の実施形態の詳細について説明する。
図1に、本実施形態に係る蓄電デバイスの外観を斜視図により示す。図2は、その蓄電デバイスを正面から見たときの内部構造を示す一部断面図である。図3Aおよび図3Bは、それぞれ、図2のIIIA線およびIIIB線による矢視断面図である。
図6Bは、第2電極と第2外部端子(第2端子板)との接続構造を示す拡大図である。第1外部端子40は、例えば長方形の板状の導体からなる第1端子板50の一端寄りに形成されている。封口板16には、貫通孔が形成されており、これに対応するように、第1端子板50の他端寄りにも貫通孔54が形成されている。第1端子板50は、貫通孔54に挿通される第3締結部材(第1リベット)52により、封口板16に固定されている。第1端子板50および第3締結部材52は、それぞれ第3締結部材52が挿通される貫通孔を有する板状ガスケット58とリング状ガスケット60により、封口板16と電気的に絶縁されている。板状ガスケット58とリング状ガスケット60とが、第1ガスケットを構成する。
図示例の第1リード62は、横断面がL字形状の部材であり、互いに垂直な、板状の第1部分62aと、第2部分62bとを有している。第1部分62aは、封口板16と平行に配置される部分であり、その中央部に第3締結部材52と接合するための接合領域62cを有している。接合領域62cの内側には、第1リード62のケース14内周縁部に形成された凸部が嵌合する嵌合孔62dが形成されている。変形前の第3締結部材52と、第1リード62の接合領域62cとは、例えば溶接により接合される。これにより、変形前の第3締結部材52と第1リード62とを含み、第1電極18と第1外部端子40とを接続するための第1接続部材70が形成される。第1接続部材70は、蓄電デバイス10の組み立てラインとは別のラインで製造することができ、一部品として供給することができる。
第4締結部材80が、上記の各貫通孔に挿通された状態で、封口板16、第2端子板50Aおよび第2ガスケット(ガスケット58A,60A)を一括してかしめることで、第2端子板50Aが封口板16の外側面で固定される。第2拡径部80bは、第4締結部材80がかしめられたときに、内部の空洞が大きくされ、これにより拡径する。第2頭部80cは、第4締結部材80がかしめられたときに例えば拉げることで、第2大径部80aとの協働により第2端子板50A、封口板16、およびガスケット58A,60Aを間に挟むように変形する。以上の効果については、第1接続部材について説明したのと同様である。
図8に、ケース14の開口端部の一部分を拡大して示す。図示例の封口構造においては、封口板16の端部(周縁部)は、封口板の外側面16bと鋭角θ1を成す斜面16a(第1斜面)を有している。一方、開口端部を形成するケース14の側壁の上端部は、ケース14の外側面14bに対して鋭角θ2を成す斜面14a(第2斜面)を有している。そして、封口板16の周縁部とケース14の開口端部とは、斜面同士で溶接されている。ここで、ケースの外側面と封口板の外側面とが垂直であれば、θ2=(90-θ1)(度)である。
金属多孔体は、三次元網目状で中空の骨格を有することが好ましい。骨格が内部に空洞を有することで、金属多孔体は、嵩高い三次元構造を有しながらも、極めて軽量である。
このような金属多孔体は、連続空隙を有する樹脂製の多孔体を、集電体を構成する金属でメッキ処理し、さらに加熱処理などにより、内部の樹脂を分解または溶解させることにより形成できる。メッキ処理により、三次元網目状の骨格が形成され、樹脂の分解や溶解により、骨格の内部を中空にすることができる。
(付記1)
第1電極と、第2電極と、前記第1電極と前記第2電極とを電気的に絶縁するセパレータとを有する電極群と、
電解質と、
前記電極群と前記電解質とを収容する、開口端部を有する有底のケースと、
前記ケースの外側に面する第1主面および前記ケースの内側に面する第2主面を有し、前記ケースの前記開口端部を封口する封口板と、を具備し、
前記第1電極は、シート状の第1集電体と、前記第1集電体に担持された第1活物質とを含んでおり、
前記第2電極は、シート状の第2集電体と、前記第2集電体に担持された第2活物質とを含んでおり、
前記第1電極と、前記第2電極とは、前記第1電極と前記第2電極との間に前記セパレータを挟んだ状態で積層されており、
前記封口板は、前記ケースの前記開口端部に嵌合する周縁部を有し、かつ前記周縁部の少なくとも一部分に、前記第1主面との間に鋭角θ1を成す第1斜面を有しており、
前記ケースの前記開口端部は、前記第1斜面と当接する第2斜面を有しており、
前記封口板の前記周縁部と前記ケースの前記開口端部とが、前記第1斜面と前記第2斜面とで溶接されている、蓄電デバイス。
シート状の第1集電体と、前記第1集電体に担持された第1活物質とを含む第1電極と、
シート状の第2集電体と、前記第2集電体に担持された第2活物質とを含む第2電極と、
前記第1電極と前記第2電極とを電気的に絶縁するセパレータと、
電解質と、
前記電極群と前記電解質とを収容する、開口端部を有する有底のケースと、
前記ケースの外側に面する第1主面および前記ケースの内側に面する第2主面を有し、前記ケースの開口端部と嵌合する周縁部を有し、かつ前記開口端部を封口する封口板、とを具備する蓄電デバイスを製造する方法であって、
(i)前記封口板の前記周縁部の少なくとも一部分に、前記第1主面との間に鋭角θ1を成す第1斜面を形成する工程と、
(ii)前記ケースの前記開口端部に前記第1斜面と当接すべき第2斜面を形成する工程と、
(iii)前記第1斜面と前記第2斜面とを当接させた状態で、前記封口板の前記第1斜面が形成された部分に、前記第1主面に対して90度±5度の方向からレーザー光を照射して、前記封口板の前記周縁部と前記ケースの前記開口端部とを互いに溶接する工程、とを含む蓄電デバイスの製造方法。
(付記3)
前記角度θ1が、5~85度である、付記2に記載の蓄電デバイスの製造方法。
(付記4)
前記ケースの前記第2斜面と隣接する部分の厚みが、0.1~3mmである、付記1に記載の蓄電デバイス。
(付記5)
前記封口板の前記第1斜面と隣接する部分の厚みが、0.1~4mmである、付記1に記載の蓄電デバイス。
(付記6)
前記ケースの前記第2斜面と隣接する部分の厚みが、0.1~3mmである、付記2に記載の蓄電デバイスの製造方法。
(付記7)
前記封口板の前記第1斜面と隣接する部分の厚みが、0.1~4mmである、付記2に記載の蓄電デバイスの製造方法。
シート状の第1集電体と、前記第1集電体に担持された第1活物質とを含む第1電極と、
シート状の第2集電体と、前記第2集電体に担持された第2活物質とを含む第2電極と、
前記第1電極と前記第2電極とを電気的に絶縁するセパレータと、
電解質と、
前記電極群と前記電解質とを収容する、開口端部を有する有底のケースと、
前記ケースの外側に面する第1主面および前記ケースの内側に面する第2主面を有し、前記開口端部を封口する封口板、とを具備する蓄電デバイスを製造する方法であって、
(i)前記ケースの開口端部と嵌合する周縁部を有し、前記周縁部の少なくとも一部分に、前記第1主面との間に鋭角θ1を成す第1斜面を有する前記封口板を準備する工程と、
(ii)前記開口端部に前記第1斜面と当接すべき第2斜面を有する前記ケースを準備する工程と、
(iii)前記第1斜面と前記第2斜面とを当接させた状態で、前記封口板の前記第1斜面が形成された部分に、前記第1主面に対して90度±5度の方向からレーザー光を照射して、前記封口板の前記周縁部と前記ケースの前記開口端部とを互いに溶接する工程、とを含む蓄電デバイスの製造方法。
101 空孔、102 骨格、102a 空洞、103 開口
104 正極合剤
12 電極群、14 ケース、14a,16a 斜面、16 封口板
18 第1電極、20 第2電極
21 セパレータ、21a 開口端部、21b 縁部
22 第1集電体、24 第2集電体
26 第1接続部、28 第2接続部
34 第1締結部材、38 第2締結部材
40 第1外部端子、42 第2外部端子、44 安全弁
50 端子形成部材、50A 第2端子板、52 第3締結部材
58,60 ガスケット
58A,60A (第2)ガスケット
62 第1リード、62A 第2リード、64 第2リード
70 第1接続部材、70A 第2接続部材、80 第4締結部材
90 異物
Claims (6)
- 第1電極と、第2電極と、前記第1電極と前記第2電極とを電気的に絶縁するセパレータとを有する電極群と、
電解質と、
前記電極群と前記電解質とを収容する、開口端部を有する有底のケースと、
前記ケースの外側に面する第1主面および前記ケースの内側に面する第2主面を有し、前記ケースの前記開口端部を封口する封口板、とを具備し、
前記第1電極は、シート状の第1集電体と、前記第1集電体に担持された第1活物質とを含んでおり、
前記第2電極は、シート状の第2集電体と、前記第2集電体に担持された第2活物質とを含んでおり、
前記第1電極と、前記第2電極とは、前記第1電極と前記第2電極との間に前記セパレータを挟んだ状態で積層されており、
前記封口板は、前記ケースの前記開口端部に嵌合する周縁部を有し、かつ前記周縁部の少なくとも一部分に、前記第1主面との間に鋭角θ1を成す第1斜面を有しており、
前記ケースの前記開口端部は、前記第1斜面と当接する第2斜面を有しており、
前記封口板の前記周縁部と前記ケースの前記開口端部とが、前記第1斜面と前記第2斜面とで溶接されている、蓄電デバイス。 - 前記角度θ1が、5度~85度である、請求項1に記載の蓄電デバイス。
- 前記電解質が、リチウムイオンとアニオンとの塩を含み、
前記第1活物質と前記第2活物質の一方が、前記リチウムイオンを吸蔵および放出する第1物質であり、他方が、前記アニオンを吸着および脱離する第2物質である、請求項1または2に記載の蓄電デバイス。 - 前記電解質が、有機カチオンとアニオンとの塩を含み、
前記第1活物質と前記第2活物質の一方が、前記有機カチオンを吸着および脱離する第3物質であり、他方が、前記アニオンを吸着および脱離する第4物質である、請求項1または2に記載の蓄電デバイス。 - 前記電解質が、アルカリ金属イオンとアニオンとの塩を含み、
前記第1活物質および前記第2活物質が、いずれも前記アルカリ金属イオンを吸蔵および放出する物質である、請求項1または2に記載の蓄電デバイス。 - 第1電極と、第2電極と、前記第1電極と前記第2電極とを電気的に絶縁するセパレータとを有する電極群と、
電解質と、
前記電極群と前記電解質とを収容する、開口端部を有する有底のケースと、
前記ケースの外側に面する第1主面および前記ケースの内側に面する第2主面を有し、前記ケースの前記開口端部に嵌合する周縁部を有し、前記周縁部の少なくとも一部分に、前記第1主面との間に鋭角θ1を成す第1斜面を有し、かつ前記ケースの前記開口端部を封口する封口板、とを具備し、
前記第1電極は、シート状の第1集電体と、前記第1集電体に担持された第1活物質とを含んでおり、
前記第2電極は、シート状の第2集電体と、前記第2集電体に担持された第2活物質とを含んでおり、
前記第1電極と、前記第2電極とは、前記第1電極と前記第2電極との間に前記セパレータを挟んだ状態で積層されており、
前記封口板を前記ケースの前記開口端部に溶接して取り付けた封口構造を有し、
前記ケースの前記開口端部は、溶接される前、前記第1斜面と当接する第2斜面を有しており、
前記封口構造は、前記第1斜面と前記第2斜面とを当接させた状態で、前記封口板の前記周縁部と前記ケースの前記開口端部とを互いに溶接することで、形成されている、蓄電デバイス。
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US14/916,887 US20160218329A1 (en) | 2013-09-18 | 2014-09-10 | Electricity storage device |
DE112014004278.1T DE112014004278T5 (de) | 2013-09-18 | 2014-09-10 | Elektrizitätsspeichervorrichtung |
KR1020167005033A KR20160057387A (ko) | 2013-09-18 | 2014-09-10 | 축전 디바이스 |
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JP2013193565A JP2015060714A (ja) | 2013-09-18 | 2013-09-18 | 電極群ならびにこれを用いた蓄電デバイス |
JP2013-193565 | 2013-09-18 | ||
JP2013-197132 | 2013-09-24 | ||
JP2013197132A JP2015065229A (ja) | 2013-09-24 | 2013-09-24 | 蓄電デバイス |
JP2013210482A JP2015076204A (ja) | 2013-10-07 | 2013-10-07 | 蓄電デバイス |
JP2013-210482 | 2013-10-07 |
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KR (1) | KR20160057387A (ja) |
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Citations (5)
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JPH10144268A (ja) * | 1996-11-08 | 1998-05-29 | Mitsubishi Cable Ind Ltd | 密閉型電池の密閉構造 |
JP2004195490A (ja) * | 2002-12-17 | 2004-07-15 | Toyota Motor Corp | 溶接物とその製造方法 |
JP2007235086A (ja) * | 2006-01-31 | 2007-09-13 | Sanyo Electric Co Ltd | 電気二重層キャパシタ |
JP2010027436A (ja) * | 2008-07-22 | 2010-02-04 | Toyota Motor Corp | 密閉型電池およびその製造方法 |
JP2013093208A (ja) * | 2011-10-26 | 2013-05-16 | Toyota Industries Corp | 電池ケース |
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KR100477969B1 (ko) * | 2002-10-25 | 2005-03-23 | 삼성에스디아이 주식회사 | 리튬 전지용 음극 및 이를 포함하는 리튬 전지 |
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2014
- 2014-09-10 DE DE112014004278.1T patent/DE112014004278T5/de not_active Withdrawn
- 2014-09-10 KR KR1020167005033A patent/KR20160057387A/ko not_active Application Discontinuation
- 2014-09-10 US US14/916,887 patent/US20160218329A1/en not_active Abandoned
- 2014-09-10 CN CN201480049863.6A patent/CN105531843A/zh active Pending
- 2014-09-10 WO PCT/JP2014/073928 patent/WO2015041116A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10144268A (ja) * | 1996-11-08 | 1998-05-29 | Mitsubishi Cable Ind Ltd | 密閉型電池の密閉構造 |
JP2004195490A (ja) * | 2002-12-17 | 2004-07-15 | Toyota Motor Corp | 溶接物とその製造方法 |
JP2007235086A (ja) * | 2006-01-31 | 2007-09-13 | Sanyo Electric Co Ltd | 電気二重層キャパシタ |
JP2010027436A (ja) * | 2008-07-22 | 2010-02-04 | Toyota Motor Corp | 密閉型電池およびその製造方法 |
JP2013093208A (ja) * | 2011-10-26 | 2013-05-16 | Toyota Industries Corp | 電池ケース |
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DE112014004278T5 (de) | 2016-06-02 |
US20160218329A1 (en) | 2016-07-28 |
CN105531843A (zh) | 2016-04-27 |
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