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WO2018190016A1 - Laminated secondary battery - Google Patents

Laminated secondary battery Download PDF

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Publication number
WO2018190016A1
WO2018190016A1 PCT/JP2018/007519 JP2018007519W WO2018190016A1 WO 2018190016 A1 WO2018190016 A1 WO 2018190016A1 JP 2018007519 W JP2018007519 W JP 2018007519W WO 2018190016 A1 WO2018190016 A1 WO 2018190016A1
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WO
WIPO (PCT)
Prior art keywords
electrode
secondary battery
terminal
electrode terminal
tab
Prior art date
Application number
PCT/JP2018/007519
Other languages
French (fr)
Japanese (ja)
Inventor
竜治 河野
繁貴 坪内
Original Assignee
株式会社日立製作所
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Filing date
Publication date
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Publication of WO2018190016A1 publication Critical patent/WO2018190016A1/en

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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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a stacked secondary battery.
  • Patent Document 1 discloses that the current collecting terminal 15 includes a first piece 151 substantially parallel to the positive and negative plates in the stacked electrode body 10, and the positive and negative plates in the stacked electrode body 10. It is bent so as to have a second piece 152 that is substantially parallel to the stacking direction, and is formed into a side view shape (L shape) to form a penetrating portion 15P that extends from the first piece 151 to the second piece 152.
  • the current collecting lead 11 is joined to the second piece 152 of the current collecting terminal 15 at the second welding point D12, and the current collecting lead 11 stacked at the first welding point D11 in the region where the through portion 15P is formed. The effect of joining together is disclosed.
  • the distance X1 of the positive electrode current collector 16 with respect to the virtual reference line F1 passing through the center of the electrode assembly 5 and the negative electrode current collector 20 The distance Y1 is varied.
  • the distance X1 is a distance between the first virtual center line F2 passing through the center of the positive electrode current collector 16 in the width direction W2 and the virtual reference line F1.
  • the distance Y1 is a distance between the second virtual center line F3 passing through the center of the negative electrode current collector 20 in the width direction W3 and the virtual reference line F1.
  • the positive electrode current collector 16 is arranged closer to the virtual reference line F1 than the negative electrode current collector 20 by making the distance X1 shorter than the distance Y1.
  • Patent Document 1 since the joint surface between the current collecting terminal 15 and the exterior body extends in a direction perpendicular to the stacking direction of the stacked electrode body 10, space is wasted in the secondary battery. Moreover, in patent document 2, since the external terminal 7, the external terminal 8, and the battery case 3 are sealed by the surfaces perpendicular to the stacking direction of the electrodes by the insulating ring 9a, the space in the secondary battery is reduced. Waste is occurring. An object of this invention is to reduce the waste of the space in a secondary battery.
  • An electrode body configured by laminating electrodes, an electrode tab electrically connected to the electrode body, an electrode terminal electrically connected to the electrode tab, an exterior body that houses the electrode body and the electrode terminal, The electrode tab and the electrode terminal are bent, the electrode tab and the electrode terminal are connected with each other extending in the laminating direction, and the electrode terminal and the exterior body are the electrode tab and the connection surface of the electrode terminal in the electrode terminal.
  • a stacked secondary battery that is sealed on the opposite surface with the surfaces extending in the stacking direction.
  • 1 is a stacked secondary battery according to an embodiment of the present invention. It is a manufacturing process of the laminated type secondary battery which concerns on one Embodiment of this invention. It is a manufacturing process of the laminated type secondary battery which concerns on one Embodiment of this invention. It is a manufacturing process of the laminated type secondary battery which concerns on one Embodiment of this invention. It is a manufacturing process of the laminated type secondary battery which concerns on one Embodiment of this invention. It is a manufacturing process of the laminated type secondary battery which concerns on one Embodiment of this invention. 1 is a stacked secondary battery according to an embodiment of the present invention.
  • a lithium ion secondary battery will be described as an example of a stacked secondary battery.
  • the technical idea of the present invention is not only a lithium ion secondary battery but also a sodium ion secondary battery, a magnesium ion secondary battery.
  • the present invention can also be applied to batteries, aluminum ion secondary batteries, and the like.
  • FIG. 1 is a schematic view of a stacked secondary battery according to an embodiment of the present invention.
  • the stacked secondary battery 1000 includes a positive electrode 100, a negative electrode 200, a positive electrode tab 130, a negative electrode tab 230, a positive electrode terminal 150, a negative electrode terminal 250, a separator 300, a sealant 500, a bending insulating member 600, and an exterior body 700.
  • a direction in which the positive electrode 100, the negative electrode 200, and the separator 300 are stacked is a stacking direction
  • a vertical direction in the stacking direction is an in-plane direction.
  • the positive electrode 100 or the negative electrode 200 is an electrode
  • the positive electrode mixture layer 110 or the negative electrode mixture layer 210 is an electrode mixture layer
  • the positive electrode current collector 120 or the negative electrode current collector 220 is an electrode current collector
  • the tab 230 may be referred to as an electrode tab
  • the positive electrode terminal 150 or the negative electrode terminal 250 may be referred to as an electrode terminal.
  • the positive electrode 100, the separator 300, and the negative electrode 200 are laminated
  • the stacked secondary battery 1000 is configured by stacking a plurality of electrode bodies 400. By connecting the positive electrode tabs 130 to each other and the negative electrode tab 230, an electrical parallel connection is configured in the stacked secondary battery 1000.
  • An electrical series connection may be configured in the stacked secondary battery 1000. In that case, an electrical series connection is configured in the plurality of electrode bodies 400, and one positive electrode tab 130 and one negative electrode tab 230 extend from the in-plane direction from the uppermost and lowermost stages of the electrode body 400, respectively.
  • the positive electrode 100 includes a positive electrode mixture layer 110 and a positive electrode current collector 120.
  • a positive electrode mixture layer 110 is formed on both surfaces of the positive electrode current collector 120.
  • the positive electrode mixture layer 110 contains at least a positive electrode active material capable of inserting and extracting Li.
  • the positive electrode active material include LiCo-based oxides, LiNi-based composite oxides, LiMn-based composite oxides, Li-Co-Ni-Mn composite oxides, LiFeP-based oxides, and the like.
  • a conductive material responsible for electronic conductivity in the positive electrode mixture layer 110, a binder that ensures adhesion between the materials in the positive electrode mixture layer 110, and further in the positive electrode mixture layer 110 A solid electrolyte for ensuring ionic conductivity may be included.
  • a material contained in the positive electrode mixture layer 110 is dissolved in a solvent to form a slurry, which is applied onto the positive electrode current collector 120.
  • the coating method is not particularly limited, and for example, a conventional method such as a doctor blade method, a dipping method, or a spray method can be used. Thereafter, the positive electrode mixture layer 110 is formed through a drying process for removing the solvent and a pressing process for ensuring the electron conductivity and ion conductivity in the positive electrode mixture layer 110.
  • the positive electrode current collector 120 is electrically connected to the positive electrode tab 130.
  • the positive electrode tab 130 is led out of the electrode body 400.
  • the positive electrode mixture layer 110 is not formed on the positive electrode tab 130.
  • the positive electrode mixture layer 110 may be formed on the positive electrode tab 130 as long as the battery performance is not adversely affected.
  • the positive electrode tab 130 is bent by the bending insulating member 600, and the bent positive electrode tab 130 extends in the stacking direction. The folded portion of the bent positive electrode tab 130 is in contact with the exterior body 700. Thereby, the size of the stacked secondary battery 1000 can be made compact.
  • an aluminum foil, an aluminum perforated foil having a hole diameter of 0.1 to 10 mm, an expanded metal, an aluminum foam plate, or the like is used.
  • the material stainless steel, titanium, or the like can be applied in addition to aluminum.
  • the thicknesses of the positive electrode current collector 120 and the positive electrode tab 130 are preferably 10 nm to 1 mm. From the viewpoint of achieving both the energy density of the stacked secondary battery 1000 and the mechanical strength of the electrode, about 1 to 100 ⁇ m is desirable.
  • Negative electrode 200 It has a negative electrode 200, a negative electrode mixture layer 210, and a negative electrode current collector 220. Negative electrode mixture layers 210 are formed on both surfaces of the negative electrode current collector 220.
  • the negative electrode mixture layer 210 contains at least a positive electrode active material capable of inserting and extracting Li.
  • the negative electrode active material include carbon-based materials such as natural graphite, soft carbon, and amorphous carbon, Si metal, Si alloy, lithium titanate, and lithium metal.
  • a conductive material responsible for electronic conductivity in the negative electrode mixture layer 210, a binder that ensures adhesion between the materials in the negative electrode mixture layer 210, and further in the negative electrode mixture layer 210 A solid electrolyte for ensuring ionic conductivity may be included.
  • the material contained in the negative electrode mixture layer 210 is dissolved in a solvent to form a slurry, which is applied onto the negative electrode current collector 220.
  • the coating method is not particularly limited, and for example, a conventional method such as a doctor blade method, a dipping method, or a spray method can be used. Thereafter, the negative electrode mixture layer 210 is formed through a drying process for removing the solvent and a pressing process for ensuring the electron conductivity and ion conductivity in the negative electrode mixture layer 210.
  • the configurations of the negative electrode current collector 220 and the negative electrode tab 230 are substantially the same as the configurations of the positive electrode current collector 120 and the positive electrode tab 130.
  • the negative electrode tab 230 is also led out of the electrode body 400, but the directions led out in the in-plane directions of the positive electrode tab 130 and the negative electrode tab 230 are opposite.
  • the negative electrode current collector 220 and the negative electrode tab 230 copper foil, copper perforated foil having a hole diameter of 0.1 to 10 mm, expanded metal, foamed copper plate, etc. are used. Is also applicable.
  • the thickness of the negative electrode current collector 220 and the negative electrode tab 230 is preferably 10 nm to 1 mm. From the viewpoint of achieving both the energy density of the stacked secondary battery 1000 and the mechanical strength of the electrode, about 1 to 100 ⁇ m is desirable.
  • the separator 300 is formed between the positive electrode 100 and the negative electrode 200, and allows lithium ions to pass therethrough when the stacked secondary battery 1000 is a lithium ion secondary battery, thereby preventing a short circuit between the positive electrode 100 and the negative electrode 200.
  • a material constituting the separator 300 a microporous film, a solid electrolyte, or the like can be used.
  • the microporous film polyolefin such as polyethylene or polypropylene, glass fiber, or the like can be used.
  • the electrolyte solution is injected into the multilayer secondary battery 1000 by injecting the electrolyte solution into the multilayer secondary battery 1000 from a vacant side of the outer package 700 or a liquid injection hole. Is filled.
  • the electrolytic solution includes, for example, a solvent and a lithium salt, and serves as a medium for transmitting lithium ions between the positive electrode 100 and the negative electrode 200.
  • ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), propylene carbonate, butylene carbonate, ⁇ -butyrolactone, phosphate triester, trimethoxymethane, dioxolane, diethyl ether, sulfolane, etc. as the solvent. Can do. These materials may be used alone or in combination.
  • lithium salt LiPF 6, LiBF 4, LiClO 4, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF 6, LiSbF 6, lithium bis oxalate borate (LiBOB), lithium imide salt (e.g., lithium bis (Fluorosulfonyl) imide, LiFSI) and the like can be preferably used. These lithium salts may be used alone or in combination.
  • the solid electrolyte Li 10 Ge 2 PS 12, Li 2 S-P 2 S 5 sulfide such as oxide-based, such as Li-La-Zr-O, the organic polymer Ya an ion liquid or ambient temperature molten salt
  • a semi-solid electrolyte supported on inorganic particles or the like, a gel electrolyte using a polymer gel as an electrolyte, or the like can be used.
  • the solid electrolyte serves as a medium for transmitting lithium ions between the positive electrode 100 and the negative electrode 200, and thus the above-described electrolytic solution is basically unnecessary. Can be configured in series. However, as long as an electrical short circuit in the multilayer secondary battery 1000 can be prevented, an electrolyte may be added to the multilayer secondary battery 1000 even when a solid electrolyte is used as the separator 300.
  • the separator 300 may be formed as a sheet between the positive electrode 100 and the negative electrode 200, or may be formed by coating on the electrode mixture layer. In FIG. 1, the separator 300 is formed on both surfaces of the electrode mixture layer. However, if the separator 300 is formed between the positive electrode 100 and the negative electrode 200, the separator 300 is formed on one surface of the electrode mixture layer. Also good.
  • the thickness of the separator 300 is several nanometers to several millimeters from the viewpoint of ensuring the energy density of the stacked secondary battery 1000, ensuring electronic insulation, and the like.
  • the electrode terminals include electrode terminal intermediate recesses (positive terminal intermediate recess 151, negative terminal intermediate recess 251), electrode terminal end recesses (positive terminal end recess 152, negative terminal end recess 252), electrode terminal protrusions (positive terminal). And a negative electrode terminal protrusion 253).
  • the electrode terminal is fixed to the exterior body 700 through the sealant 500 and is electrically connected to the electrode tab.
  • the electrode terminal is formed with an electrode terminal protrusion that protrudes from the exterior body 700 in the in-plane direction.
  • the protruding portion of the electrode terminal is connected to a bus bar (not shown), and the bus bar electrically connects a plurality of stacked secondary batteries 1000.
  • An electrode terminal intermediate recess is provided at an intermediate portion of the electrode terminals in the stacking direction, and the electrode terminal intermediate recess serves as a junction between the electrode terminal and the electrode tab. At the junction point, the electrode tab and the electrode terminal are connected by surfaces extending in the stacking direction.
  • the electrode terminal intermediate recess is formed above the sealant 500 in the stacking direction so that the electrode tab and the electrode terminal can be joined.
  • the electrode terminal intermediate recess in the intermediate part of the electrode terminal, the electrode terminal and the electrode tab can be easily joined.
  • a convex portion is formed on the side of the electrode terminal intermediate concave portion where the electrode body 400 is formed.
  • the electrode terminal and the electrode tab are partially joined.
  • the electrode terminal end recess is provided at the end of the electrode terminal in the stacking direction, and the sealant 500 is formed in the electrode terminal end recess.
  • the electrode terminal end concave portion By providing the electrode terminal end concave portion, the electrode terminal protruding portion can be exposed from the exterior body 700, and by simply contacting each electrode terminal protruding portion of the plurality of stacked secondary batteries 1000 in the in-plane direction, A plurality of stacked secondary batteries 1000 can be electrically connected.
  • the metal of the electrode terminal can be a metal such as aluminum, copper, nickel or stainless steel.
  • the sealant 500 is disposed between the electrode terminal end recess and the bent portion of the exterior body 700 to insulate the electrode terminal and the exterior body 700.
  • the sealant agent 500 seals and seals the interface between the surface of the electrode terminal opposite to the connection surface between the electrode terminal and the electrode tab and the inner surface of the outer periphery of the bent portion 700.
  • the length of the sealant 500 in the stacking direction is formed larger than the bent portion of the exterior body 700.
  • the sealant 500 is formed in a ring shape so as to surround the electrode terminal.
  • Sealant agent 500 is formed of an insulating material such as resin.
  • ⁇ Bending insulation member 600> In the in-plane direction, the bending insulating members 600 disposed on both sides of the electrode body 400 are integrally formed. The bending insulating member 600 is formed to bend the electrode tabs in the stacking direction, and is formed between the electrode tabs bent in the in-plane direction.
  • the lower end of the folding insulating member 600 in the stacking direction is in contact with the folded portion of the folded positive electrode tab 130.
  • the upper end portion of the bending insulating member 600 in the stacking direction is in contact with the exterior body 700.
  • the bending insulating member 600 is made of an insulating resin material such as polypropylene (PP) or polybutylene terephthalate (PBT).
  • PP polypropylene
  • PBT polybutylene terephthalate
  • the exterior body 700 houses the electrode, the separator 300, the electrode tab, the electrode terminal, the sealant 500, and the insulating member 600 for bending.
  • an opening is formed in the exterior body 700 so that the electrode terminals are exposed on the surface of the exterior body 700 where the electrode terminals are formed.
  • a folding part is provided at an end in the stacking direction of the exterior body 700, and the folding part is formed so as to be in contact with the sealant agent 500.
  • the electrode terminal and the exterior body 700 are sealed with surfaces extending in the stacking direction on the surface of the electrode terminal opposite to the electrode tab and the connection surface of the electrode terminal.
  • the exterior body 700 is formed in a tube shape, and it is desirable that the exterior body 700 has corrosion resistance to an electrolyte such as aluminum, SUS, or nickel-plated steel whose surface is insulated.
  • the exterior body 700 is preferably made of a material having excellent processability such as bending and drawing.
  • the exterior body 700 may be a heat-shrinkable tube made of an annular resin material, and may be contracted in a state where a member housed in the exterior body 700 such as the electrode body 400 is covered.
  • FIG. 2 shows a manufacturing process of the laminated secondary battery according to the embodiment of the present invention.
  • negative electrodes 200 on which separators 300 are formed and positive electrodes 100 on which separators 300 are formed are alternately stacked on a substrate 2000.
  • the electrode tab extends in the in-plane direction.
  • FIG. 3 shows a manufacturing process of the laminated secondary battery according to the embodiment of the present invention.
  • the electrode tabs are bundled by pushing the insulating member 600 for bending into the electrode tabs in the stacking direction.
  • the electrode tab has a portion bundled in the stacking direction on the side where the electrode body 400 of the bending insulating member 600 is formed and a portion bundled in the in-plane direction below the bending insulating member 600.
  • FIG. 4 shows a manufacturing process of the laminated secondary battery according to the embodiment of the present invention.
  • an electrode tab and an electrode terminal are joined, for example by ultrasonic welding.
  • Any part of the electrode tab extending in the in-plane direction may be a junction point between the electrode tab and the electrode terminal, but the portion where all the electrode tabs in the laminated secondary battery 1000 are bundled in the in-plane direction is It is desirable to be a junction point between the electrode tab and the electrode terminal.
  • a sealant 500 for sealing the electrode body 400 is formed on the electrode terminal at the lower part in the stacking direction.
  • FIG. 5 shows a manufacturing process of the laminated secondary battery according to the embodiment of the present invention.
  • the electrode tab to which the electrode terminals are joined is bent in the stacking direction. Thereby, an electrode tab and an electrode terminal will be electrically connected by the surfaces extended
  • the bent electrode tab may be brought into contact with the bending insulating member 600, or a space may be provided within a range that does not impair the performance of the stacked secondary battery 1000.
  • FIG. 6 shows a manufacturing process of the laminated secondary battery according to the embodiment of the present invention.
  • the electrode body 400 is sealed by the exterior body 700 and the electrode terminal by bending the end portion of the exterior body 700 and bonding the bent portion of the exterior body 700 and the sealant 500.
  • the sealant 500 ensures the insulation between the exterior body 700 and the electrode terminals.
  • the exterior body 700 and the electrode terminal are sealed with the surfaces extending in the stacking direction on the surface of the electrode terminal opposite to the junction point between the electrode terminal and the electrode tab.
  • FIG. 7 is a schematic view of a stacked secondary battery according to an embodiment of the present invention.
  • the multilayer secondary battery 1000 of FIG. 7 has a configuration without the folding insulating member 600 compared to the multilayer secondary battery 1000 of FIG. 1, in other words, a space is provided in the in-plane direction of the folded electrode tab. ing.
  • the configuration without the folding insulating member 600 is achieved by removing the folding insulating member 600 in the stacking direction after the step of FIG. With such a configuration, the stacked secondary battery 1000 can be reduced in weight.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

A laminated secondary battery (1000) has an electrode body (400) formed by laminating electrodes (100, 200), electrode tabs (130, 230) electrically connected to the electrode body, electrode terminals (150, 250) electrically connected to the electrode tabs, and an exterior body (700) for housing the electrode body and the electrode terminals, wherein: the electrode tabs are bent; the electrode tabs and the electrode terminals are connected to each other through the surfaces thereof extending in the lamination direction; and the electrode terminals and the exterior body are sealed to each other through the surfaces thereof extending in the lamination direction on the surface of the electrode terminals opposite to the connection surfaces of the electrode tabs and the electrode terminals.

Description

積層型二次電池Multilayer secondary battery
　本発明は、積層型二次電池に関する。 The present invention relates to a stacked secondary battery.
　積層型二次電池に関する技術として、特許文献１には、集電端子１５を、積層電極体１０における正負極板と実質的に平行な第１片１５１と、積層電極体１０における正負極板の積層方向と実質的に平行な第２片１５２とを有するように折り曲げて側面視鉤形状（Ｌ形状）に成形し、第１片１５１から第２片１５２にかけて拡がる貫通部１５Ｐを形成する。集電リード１１を、集電端子１５の第２片１５２に第２溶接点Ｄ１２で接合するとともに、貫通部１５Ｐが形成された領域内の第１溶接点Ｄ１１で、積層された集電リード１１同士を接合する、旨が開示されている。また、特許文献２には、電極組立体５を層方向から正面視した場合に、電極組立体５の中央を通る仮想基準線Ｆ１に対する正極集電部１６の距離Ｘ１と負極集電部２０の距離Ｙ１を異ならせる。距離Ｘ１は、正極集電部１６の幅方向Ｗ２の中央を通る第１仮想中央線Ｆ２と仮想基準線Ｆ１の距離である。距離Ｙ１は、負極集電部２０の幅方向Ｗ３の中央を通る第２仮想中央線Ｆ３と仮想基準線Ｆ１の距離である。そして、距離Ｘ１を、距離Ｙ１に比して短くすることにより、正極集電部１６は、負極集電部２０よりも仮想基準線Ｆ１寄りに配置される、旨が開示されている。 As a technique related to the stacked secondary battery, Patent Document 1 discloses that the current collecting terminal 15 includes a first piece 151 substantially parallel to the positive and negative plates in the stacked electrode body 10, and the positive and negative plates in the stacked electrode body 10. It is bent so as to have a second piece 152 that is substantially parallel to the stacking direction, and is formed into a side view shape (L shape) to form a penetrating portion 15P that extends from the first piece 151 to the second piece 152. The current collecting lead 11 is joined to the second piece 152 of the current collecting terminal 15 at the second welding point D12, and the current collecting lead 11 stacked at the first welding point D11 in the region where the through portion 15P is formed. The effect of joining together is disclosed. Further, in Patent Document 2, when the electrode assembly 5 is viewed from the front in the layer direction, the distance X1 of the positive electrode current collector 16 with respect to the virtual reference line F1 passing through the center of the electrode assembly 5 and the negative electrode current collector 20 The distance Y1 is varied. The distance X1 is a distance between the first virtual center line F2 passing through the center of the positive electrode current collector 16 in the width direction W2 and the virtual reference line F1. The distance Y1 is a distance between the second virtual center line F3 passing through the center of the negative electrode current collector 20 in the width direction W3 and the virtual reference line F1. And it is disclosed that the positive electrode current collector 16 is arranged closer to the virtual reference line F1 than the negative electrode current collector 20 by making the distance X1 shorter than the distance Y1.
特開２０１４－１０２８７５号公報JP 2014-102875 A 特開２０１３－２０６６０８号公報JP 2013-206608 A
　特許文献１では、集電端子１５と外装体との接合面が積層電極体１０の積層方向に対する垂直方向に延伸しているので、二次電池内でのスペースの無駄が発生している。また、特許文献２では、絶縁リング９ａにより外部端子７および外部端子８と電槽缶３とが電極の積層方向に対する垂直方向の面同士でシールされているため、二次電池内でのスペースの無駄が発生している。本発明は、二次電池内でのスペースの無駄を低減することを目的とする。 In Patent Document 1, since the joint surface between the current collecting terminal 15 and the exterior body extends in a direction perpendicular to the stacking direction of the stacked electrode body 10, space is wasted in the secondary battery. Moreover, in patent document 2, since the external terminal 7, the external terminal 8, and the battery case 3 are sealed by the surfaces perpendicular to the stacking direction of the electrodes by the insulating ring 9a, the space in the secondary battery is reduced. Waste is occurring. An object of this invention is to reduce the waste of the space in a secondary battery.
　上記課題を解決するための本発明の特徴は、例えば以下の通りである。 The features of the present invention for solving the above problems are as follows, for example.
　電極が積層されて構成された電極体と、電極体に電気的に接続された電極タブと、電極タブに電気的に接続された電極端子と、電極体および電極端子を収納する外装体と、を有し、電極タブは折り曲げられており、電極タブおよび電極端子は、積層方向に延伸する面同士で接続され、電極端子および外装体は、電極端子における電極タブおよび電極端子の接続面とは反対側の面で、積層方向に延伸する面同士でシールされる積層型二次電池。 An electrode body configured by laminating electrodes, an electrode tab electrically connected to the electrode body, an electrode terminal electrically connected to the electrode tab, an exterior body that houses the electrode body and the electrode terminal, The electrode tab and the electrode terminal are bent, the electrode tab and the electrode terminal are connected with each other extending in the laminating direction, and the electrode terminal and the exterior body are the electrode tab and the connection surface of the electrode terminal in the electrode terminal. A stacked secondary battery that is sealed on the opposite surface with the surfaces extending in the stacking direction.
　本発明により、二次電池内でのスペースの無駄を低減できる。上記した以外の課題、構成及び効果は以下の実施形態の説明により明らかにされる。 According to the present invention, the waste of space in the secondary battery can be reduced. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.
本発明の一実施形態に係る積層型二次電池である。1 is a stacked secondary battery according to an embodiment of the present invention. 本発明の一実施形態に係る積層型二次電池の製造工程である。It is a manufacturing process of the laminated type secondary battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係る積層型二次電池の製造工程である。It is a manufacturing process of the laminated type secondary battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係る積層型二次電池の製造工程である。It is a manufacturing process of the laminated type secondary battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係る積層型二次電池の製造工程である。It is a manufacturing process of the laminated type secondary battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係る積層型二次電池の製造工程である。It is a manufacturing process of the laminated type secondary battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係る積層型二次電池である。1 is a stacked secondary battery according to an embodiment of the present invention.
　以下、図面等を用いて、本発明の実施形態について説明する。以下の説明は本発明の内容の具体例を示すものであり、本発明がこれらの説明に限定されるものではなく、本明細書に開示される技術的思想の範囲内において当業者による様々な変更および修正が可能である。また、本発明を説明するための全図において、同一の機能を有するものは、同一の符号を付け、その繰り返しの説明は省略する場合がある。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description shows specific examples of the contents of the present invention, and the present invention is not limited to these descriptions. Various modifications by those skilled in the art are within the scope of the technical idea disclosed in this specification. Changes and modifications are possible. In all the drawings for explaining the present invention, components having the same function are denoted by the same reference numerals, and repeated description thereof may be omitted.
　本明細書では、積層型二次電池としてリチウムイオン二次電池を例にして説明するが、本発明の技術的思想は、リチウムイオン二次電池の他、ナトリウムイオン二次電池、マグネシウムイオン二次電池、アルミニウムイオン二次電池などに対しても適用することができる。 In this specification, a lithium ion secondary battery will be described as an example of a stacked secondary battery. However, the technical idea of the present invention is not only a lithium ion secondary battery but also a sodium ion secondary battery, a magnesium ion secondary battery. The present invention can also be applied to batteries, aluminum ion secondary batteries, and the like.
　図１は、本発明の一実施形態に係る積層型二次電池の模式図である。積層型二次電池１０００は、正極１００、負極２００、正極タブ１３０、負極タブ２３０、正極端子１５０、負極端子２５０、セパレータ３００、シーラント剤５００、折り曲げ用絶縁部材６００、外装体７００を有する。図１のように、正極１００、負極２００、セパレータ３００が積層されている方向を積層方向、積層方向の垂面方向を面内方向、とする。 FIG. 1 is a schematic view of a stacked secondary battery according to an embodiment of the present invention. The stacked secondary battery 1000 includes a positive electrode 100, a negative electrode 200, a positive electrode tab 130, a negative electrode tab 230, a positive electrode terminal 150, a negative electrode terminal 250, a separator 300, a sealant 500, a bending insulating member 600, and an exterior body 700. As shown in FIG. 1, a direction in which the positive electrode 100, the negative electrode 200, and the separator 300 are stacked is a stacking direction, and a vertical direction in the stacking direction is an in-plane direction.
　以下では、正極１００または負極２００を電極、正極合剤層１１０または負極合剤層２１０を電極合剤層、正極集電体１２０または負極集電体２２０を電極集電体、正極タブ１３０または負極タブ２３０を電極タブ、正極端子１５０または負極端子２５０を電極端子、と称する場合がある。 Hereinafter, the positive electrode 100 or the negative electrode 200 is an electrode, the positive electrode mixture layer 110 or the negative electrode mixture layer 210 is an electrode mixture layer, the positive electrode current collector 120 or the negative electrode current collector 220 is an electrode current collector, the positive electrode tab 130 or the negative electrode The tab 230 may be referred to as an electrode tab, and the positive electrode terminal 150 or the negative electrode terminal 250 may be referred to as an electrode terminal.
　正極１００、セパレータ３００、負極２００が積層されて電極体４００が構成される。積層型二次電池１０００は、複数の電極体４００が積層されて構成される。正極タブ１３０同士および負極タブ２３０が接続されることで、積層型二次電池１０００中で電気的な並列接続が構成される。積層型二次電池１０００中で電気的な直列接続を構成させてもよい。その場合、複数の電極体４００内で電気的な直列接続が構成され、電極体４００の最上段および最下段からそれぞれ一つの正極タブ１３０および負極タブ２３０が面内方向から延伸することになる。 The positive electrode 100, the separator 300, and the negative electrode 200 are laminated | stacked and the electrode body 400 is comprised. The stacked secondary battery 1000 is configured by stacking a plurality of electrode bodies 400. By connecting the positive electrode tabs 130 to each other and the negative electrode tab 230, an electrical parallel connection is configured in the stacked secondary battery 1000. An electrical series connection may be configured in the stacked secondary battery 1000. In that case, an electrical series connection is configured in the plurality of electrode bodies 400, and one positive electrode tab 130 and one negative electrode tab 230 extend from the in-plane direction from the uppermost and lowermost stages of the electrode body 400, respectively.
　＜正極１００＞
　正極１００は、正極合剤層１１０および正極集電体１２０を有する。正極集電体１２０の両面に正極合剤層１１０が形成されている。 <Positive electrode 100>
The positive electrode 100 includes a positive electrode mixture layer 110 and a positive electrode current collector 120. A positive electrode mixture layer 110 is formed on both surfaces of the positive electrode current collector 120.
　＜正極合剤層１１０＞
　正極合剤層１１０には、少なくともＬｉの吸蔵・放出が可能な正極活物質が含まれている。正極活物質としては、ＬｉＣｏ系酸化物、ＬｉＮｉ系複合酸化物、ＬｉＭｎ系複合酸化物、Ｌｉ－Ｃｏ－Ｎｉ－Ｍｎ複合酸化物、ＬｉＦｅＰ系酸化物などが上げられる。正極合剤層１１０中に、正極合剤層１１０内の電子伝導性を担う導電材や、正極合剤層１１０内の材料間の密着性を確保するバインダ、さらには正極合剤層１１０内のイオン伝導性を確保するための固体電解質を含めてもよい。 <Positive electrode mixture layer 110>
The positive electrode mixture layer 110 contains at least a positive electrode active material capable of inserting and extracting Li. Examples of the positive electrode active material include LiCo-based oxides, LiNi-based composite oxides, LiMn-based composite oxides, Li-Co-Ni-Mn composite oxides, LiFeP-based oxides, and the like. In the positive electrode mixture layer 110, a conductive material responsible for electronic conductivity in the positive electrode mixture layer 110, a binder that ensures adhesion between the materials in the positive electrode mixture layer 110, and further in the positive electrode mixture layer 110 A solid electrolyte for ensuring ionic conductivity may be included.
　正極合剤層１１０を作製する方法として、正極合剤層１１０に含まれる材料を溶媒に溶かしてスラリー化し、それを正極集電体１２０上に塗工する。塗工方法に特段の限定はなく、例えば、ドクターブレード法、ディッピング法、スプレー法などの従前の方法を利用できる。その後、溶媒を除去するための乾燥、正極合剤層１１０内の電子伝導性、イオン伝導性を確保するためのプレス工程を経て、正極合剤層１１０が形成される。 As a method for producing the positive electrode mixture layer 110, a material contained in the positive electrode mixture layer 110 is dissolved in a solvent to form a slurry, which is applied onto the positive electrode current collector 120. The coating method is not particularly limited, and for example, a conventional method such as a doctor blade method, a dipping method, or a spray method can be used. Thereafter, the positive electrode mixture layer 110 is formed through a drying process for removing the solvent and a pressing process for ensuring the electron conductivity and ion conductivity in the positive electrode mixture layer 110.
　＜正極集電体１２０、正極タブ１３０＞
　正極集電体１２０は正極タブ１３０と電気的に接続されている。正極タブ１３０は電極体４００の外部に導出されている。図１において、正極タブ１３０には正極合剤層１１０が形成されていない。ただし、電池性能に悪影響を与えない範囲で正極タブ１３０に正極合剤層１１０を形成してもよい。正極タブ１３０は折り曲げ用絶縁部材６００によって折り曲げられており、折り曲げられた正極タブ１３０は積層方向に延伸している。折り曲げられた正極タブ１３０の折り返し部は外装体７００に接している。これにより、積層型二次電池１０００の大きさをコンパクトにできる。 <Positive electrode current collector 120, positive electrode tab 130>
The positive electrode current collector 120 is electrically connected to the positive electrode tab 130. The positive electrode tab 130 is led out of the electrode body 400. In FIG. 1, the positive electrode mixture layer 110 is not formed on the positive electrode tab 130. However, the positive electrode mixture layer 110 may be formed on the positive electrode tab 130 as long as the battery performance is not adversely affected. The positive electrode tab 130 is bent by the bending insulating member 600, and the bent positive electrode tab 130 extends in the stacking direction. The folded portion of the bent positive electrode tab 130 is in contact with the exterior body 700. Thereby, the size of the stacked secondary battery 1000 can be made compact.
　正極集電体１２０および正極タブ１３０には、アルミニウム箔や孔径０．１～１０ｍｍのアルミニウム製穿孔箔、エキスパンドメタル、発泡アルミニウム板などが用いられる。材質は、アルミニウムの他に、ステンレス、チタンなども適用できる。正極集電体１２０および正極タブ１３０の厚さは、好ましくは１０ｎｍ～１ｍｍである。積層型二次電池１０００のエネルギー密度と電極の機械強度両立の観点から１～１００μｍ程度が望ましい。 For the positive electrode current collector 120 and the positive electrode tab 130, an aluminum foil, an aluminum perforated foil having a hole diameter of 0.1 to 10 mm, an expanded metal, an aluminum foam plate, or the like is used. As the material, stainless steel, titanium, or the like can be applied in addition to aluminum. The thicknesses of the positive electrode current collector 120 and the positive electrode tab 130 are preferably 10 nm to 1 mm. From the viewpoint of achieving both the energy density of the stacked secondary battery 1000 and the mechanical strength of the electrode, about 1 to 100 μm is desirable.
　＜負極２００＞
　負極２００、負極合剤層２１０および負極集電体２２０を有する。負極集電体２２０の両面に負極合剤層２１０が形成されている。 <Negative electrode 200>
It has a negative electrode 200, a negative electrode mixture layer 210, and a negative electrode current collector 220. Negative electrode mixture layers 210 are formed on both surfaces of the negative electrode current collector 220.
　＜負極合剤層２１０＞
　負極合剤層２１０には、少なくともＬｉの吸蔵・放出が可能な正極活物質が含まれている。負極活物質としては、天然黒鉛、ソフトカーボン、非晶質炭素などの炭素系材料、Ｓｉ金属やＳｉ合金、チタン酸リチウム、リチウム金属などが上げられる。負極合剤層２１０中に、負極合剤層２１０内の電子伝導性を担う導電材や、負極合剤層２１０内の材料間の密着性を確保するバインダ、さらには負極合剤層２１０内のイオン伝導性を確保するための固体電解質を含めてもよい。 <Negative electrode mixture layer 210>
The negative electrode mixture layer 210 contains at least a positive electrode active material capable of inserting and extracting Li. Examples of the negative electrode active material include carbon-based materials such as natural graphite, soft carbon, and amorphous carbon, Si metal, Si alloy, lithium titanate, and lithium metal. In the negative electrode mixture layer 210, a conductive material responsible for electronic conductivity in the negative electrode mixture layer 210, a binder that ensures adhesion between the materials in the negative electrode mixture layer 210, and further in the negative electrode mixture layer 210 A solid electrolyte for ensuring ionic conductivity may be included.
　負極合剤層２１０を作製する方法として、負極合剤層２１０に含まれる材料を溶媒に溶かしてスラリー化し、それを負極集電体２２０上に塗工する。塗工方法に特段の限定はなく、例えば、ドクターブレード法、ディッピング法、スプレー法などの従前の方法を利用できる。その後、溶媒を除去するための乾燥、負極合剤層２１０内の電子伝導性、イオン伝導性を確保するためのプレス工程を経て、負極合剤層２１０が形成する。 As a method for producing the negative electrode mixture layer 210, the material contained in the negative electrode mixture layer 210 is dissolved in a solvent to form a slurry, which is applied onto the negative electrode current collector 220. The coating method is not particularly limited, and for example, a conventional method such as a doctor blade method, a dipping method, or a spray method can be used. Thereafter, the negative electrode mixture layer 210 is formed through a drying process for removing the solvent and a pressing process for ensuring the electron conductivity and ion conductivity in the negative electrode mixture layer 210.
　＜負極集電体２２０、負極タブ２３０＞
　負極集電体２２０および負極タブ２３０の構成は、概ね正極集電体１２０および正極タブ１３０の構成と同様である。正極タブ１３０と同様に負極タブ２３０も電極体４００の外部に導出されているが、正極タブ１３０および負極タブ２３０の面内方向において導出されている方向は、反対になっている。 <Negative electrode current collector 220, negative electrode tab 230>
The configurations of the negative electrode current collector 220 and the negative electrode tab 230 are substantially the same as the configurations of the positive electrode current collector 120 and the positive electrode tab 130. Similarly to the positive electrode tab 130, the negative electrode tab 230 is also led out of the electrode body 400, but the directions led out in the in-plane directions of the positive electrode tab 130 and the negative electrode tab 230 are opposite.
　負極集電体２２０および負極タブ２３０には、銅箔や孔径０．１～１０ｍｍの銅製穿孔箔、エキスパンドメタル、発泡銅板などが用いられ、材質は、銅の他に、ステンレス、チタン、ニッケルなども適用できる。負極集電体２２０および負極タブ２３０の厚さは、好ましくは１０ｎｍ～１ｍｍである。積層型二次電池１０００のエネルギー密度と電極の機械強度両立の観点から１～１００μｍ程度が望ましい。 For the negative electrode current collector 220 and the negative electrode tab 230, copper foil, copper perforated foil having a hole diameter of 0.1 to 10 mm, expanded metal, foamed copper plate, etc. are used. Is also applicable. The thickness of the negative electrode current collector 220 and the negative electrode tab 230 is preferably 10 nm to 1 mm. From the viewpoint of achieving both the energy density of the stacked secondary battery 1000 and the mechanical strength of the electrode, about 1 to 100 μm is desirable.
　＜セパレータ３００＞
　セパレータ３００は、正極１００と負極２００との間に形成され、積層型二次電池１０００がリチウムイオン二次電池の場合リチウムイオンを透過させ、正極１００と負極２００の短絡を防止する。セパレータ３００を構成する材料として、微多孔膜や固体電解質等を利用できる。 <Separator 300>
The separator 300 is formed between the positive electrode 100 and the negative electrode 200, and allows lithium ions to pass therethrough when the stacked secondary battery 1000 is a lithium ion secondary battery, thereby preventing a short circuit between the positive electrode 100 and the negative electrode 200. As a material constituting the separator 300, a microporous film, a solid electrolyte, or the like can be used.
　微多孔膜として、ポリエチレンやポリプロピレンといったポリオレフィンやガラス繊維などを利用できる。セパレータ３００に微多孔膜が用いられる場合、外装体７００の空いている１辺や注液孔から積層型二次電池１０００に電解液を注入することで、積層型二次電池１０００中に電解液が充填される。 As the microporous film, polyolefin such as polyethylene or polypropylene, glass fiber, or the like can be used. When a microporous film is used for the separator 300, the electrolyte solution is injected into the multilayer secondary battery 1000 by injecting the electrolyte solution into the multilayer secondary battery 1000 from a vacant side of the outer package 700 or a liquid injection hole. Is filled.
　電解液は、例えば溶媒及びリチウム塩を有し、正極１００と負極２００の間でリチウムイオンの伝達させる媒体となる。溶媒として、エチレンカーボネート（ＥＣ）、ジメチルカーボネート（ＤＭＣ）、ジエチルカーボネート（ＤＥＣ）、プロピレンカーボネート、ブチレンカーボネート、γ－ブチロラクトン、リン酸トリエステル、トリメトキシメタン、ジオキソラン、ジエチルエーテル、スルホラン等を用いることができる。こられの材料を単独または複数組み合わせて使用してもよい。リチウム塩としては、例えば、ＬｉＰＦ６、ＬｉＢＦ４、ＬｉＣｌＯ４、ＬｉＣＦ３ＳＯ３、ＬｉＣＦ３ＣＯ２、ＬｉＡｓＦ６、ＬｉＳｂＦ６、リチウムビスオキサレートボラート（ＬｉＢＯＢ）、リチウムイミド塩（例えば、リチウムビス（フルオロスルホニル）イミド、ＬｉＦＳＩ）等を好ましく用いることができる。これらのリチウム塩を単独または複数組み合わせて使用してもよい。 The electrolytic solution includes, for example, a solvent and a lithium salt, and serves as a medium for transmitting lithium ions between the positive electrode 100 and the negative electrode 200. Use ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), propylene carbonate, butylene carbonate, γ-butyrolactone, phosphate triester, trimethoxymethane, dioxolane, diethyl ether, sulfolane, etc. as the solvent. Can do. These materials may be used alone or in combination. Examples of the lithium salt, LiPF 6, LiBF 4, LiClO 4, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF 6, LiSbF 6, lithium bis oxalate borate (LiBOB), lithium imide salt (e.g., lithium bis (Fluorosulfonyl) imide, LiFSI) and the like can be preferably used. These lithium salts may be used alone or in combination.
　固体電解質として、Ｌｉ１０Ｇｅ２ＰＳ１２、Ｌｉ２Ｓ－Ｐ２Ｓ５などの硫化物系、Ｌｉ－Ｌａ－Ｚｒ－Ｏなどの酸化物系、イオン液体や常温溶融塩などを有機高分子や無機粒子などに担持させた半固体電解質、高分子ゲルを電解質としたゲル電解質等を利用できる。セパレータ３００として固体電解質を用いた場合、固体電解質が正極１００と負極２００の間にリチウムイオンの伝達させる媒体となるため上記の電解液は基本不要となるため、積層型二次電池１０００中で電気的な直列接続を構成できる。ただし、積層型二次電池１０００中での電気的な短絡を防止できるのであれば、セパレータ３００として固体電解質を用いた場合でも積層型二次電池１０００中に電解液を添加してもよい。 As the solid electrolyte, Li 10 Ge 2 PS 12, Li 2 S-P 2 S 5 sulfide such as oxide-based, such as Li-La-Zr-O, the organic polymer Ya an ion liquid or ambient temperature molten salt A semi-solid electrolyte supported on inorganic particles or the like, a gel electrolyte using a polymer gel as an electrolyte, or the like can be used. When a solid electrolyte is used as the separator 300, the solid electrolyte serves as a medium for transmitting lithium ions between the positive electrode 100 and the negative electrode 200, and thus the above-described electrolytic solution is basically unnecessary. Can be configured in series. However, as long as an electrical short circuit in the multilayer secondary battery 1000 can be prevented, an electrolyte may be added to the multilayer secondary battery 1000 even when a solid electrolyte is used as the separator 300.
　セパレータ３００は、シートとして正極１００と負極２００との間に形成してもよいし、電極合剤層の上に塗布により形成してもよい。図１では、電極合剤層の両面にセパレータ３００が形成されているが、正極１００と負極２００との間にセパレータ３００が形成されば、電極合剤層の片面にセパレータ３００が形成されていてもよい。セパレータ３００の厚さは積層型二次電池１０００のエネルギー密度、電子絶縁性の確保等の観点から数ｎｍ～数ｍｍのサイズとなる。 The separator 300 may be formed as a sheet between the positive electrode 100 and the negative electrode 200, or may be formed by coating on the electrode mixture layer. In FIG. 1, the separator 300 is formed on both surfaces of the electrode mixture layer. However, if the separator 300 is formed between the positive electrode 100 and the negative electrode 200, the separator 300 is formed on one surface of the electrode mixture layer. Also good. The thickness of the separator 300 is several nanometers to several millimeters from the viewpoint of ensuring the energy density of the stacked secondary battery 1000, ensuring electronic insulation, and the like.
　＜電極端子＞
　電極端子は、電極端子中間凹部（正極端子中間凹部１５１、負極端子中間凹部２５１）、電極端子端部凹部（正極端子端部凹部１５２、負極端子端部凹部２５２）、電極端子突出部（正極端子突出部１５３、負極端子突出部２５３）を有する。 <Electrode terminal>
The electrode terminals include electrode terminal intermediate recesses (positive terminal intermediate recess 151, negative terminal intermediate recess 251), electrode terminal end recesses (positive terminal end recess 152, negative terminal end recess 252), electrode terminal protrusions (positive terminal). And a negative electrode terminal protrusion 253).
　電極端子は、外装体７００にシーラント剤５００を介して固定され、電極タブと電気的に接続されている。電極端子は面内方向において外装体７００より突出する電極端子突出部が形成されている。電極端子の突出部は図示省略するバスバーに接続され、バスバーは複数の積層型二次電池１０００を電気的に接続する。 
　積層方向における電極端子の中間部には電極端子中間凹部が設けられており、電極端子中間凹部が電極端子および電極タブの接合点になっている。接合点において、電極タブおよび電極端子は、積層方向に延伸する面同士で接続されている。電極端子中間凹部は、電極タブおよび電極端子が接合できるように、積層方向においてシーラント剤５００より上部に形成されている。電極端子の中間部に電極端子中間凹部を設けることにより、電極端子および電極タブの接合を容易にしている。面内方向において、電極端子中間凹部の電極体４００が形成されている側には凸部が形成されている。換言すれば、積層方向において、電極端子および電極タブで接していない箇所があり、電極端子および電極タブは部分的に接合されている。これにより、積層方向において電極端子および電極タブが全面で接している場合に比べて、電極端子および電極タブの接合で発生した熱が電極端子全体に分散されるのを抑制している。 The electrode terminal is fixed to the exterior body 700 through the sealant 500 and is electrically connected to the electrode tab. The electrode terminal is formed with an electrode terminal protrusion that protrudes from the exterior body 700 in the in-plane direction. The protruding portion of the electrode terminal is connected to a bus bar (not shown), and the bus bar electrically connects a plurality of stacked secondary batteries 1000.
An electrode terminal intermediate recess is provided at an intermediate portion of the electrode terminals in the stacking direction, and the electrode terminal intermediate recess serves as a junction between the electrode terminal and the electrode tab. At the junction point, the electrode tab and the electrode terminal are connected by surfaces extending in the stacking direction. The electrode terminal intermediate recess is formed above the sealant 500 in the stacking direction so that the electrode tab and the electrode terminal can be joined. By providing the electrode terminal intermediate recess in the intermediate part of the electrode terminal, the electrode terminal and the electrode tab can be easily joined. In the in-plane direction, a convex portion is formed on the side of the electrode terminal intermediate concave portion where the electrode body 400 is formed. In other words, in the stacking direction, there is a portion that is not in contact with the electrode terminal and the electrode tab, and the electrode terminal and the electrode tab are partially joined. Thereby, compared with the case where the electrode terminal and the electrode tab are in contact with the entire surface in the stacking direction, the heat generated by joining the electrode terminal and the electrode tab is suppressed from being dispersed throughout the electrode terminal.
　積層方向における電極端子の端部には電極端子端部凹部が設けられており、電極端子端部凹部にシーラント剤５００が形成されている。電極端子端部凹部を設けることにより、電極端子突出部を外装体７００より露出させることができ、面内方向で複数の積層型二次電池１０００のそれぞれの電極端子突出部を接触させるだけで、複数の積層型二次電池１０００を電気的に接続できる。　電極端子の材質として、アルミニウム、銅、ニッケル、ステンレスなどの金属を用いることができる。 The electrode terminal end recess is provided at the end of the electrode terminal in the stacking direction, and the sealant 500 is formed in the electrode terminal end recess. By providing the electrode terminal end concave portion, the electrode terminal protruding portion can be exposed from the exterior body 700, and by simply contacting each electrode terminal protruding portion of the plurality of stacked secondary batteries 1000 in the in-plane direction, A plurality of stacked secondary batteries 1000 can be electrically connected. The metal of the electrode terminal can be a metal such as aluminum, copper, nickel or stainless steel.
　＜シーラント剤５００＞
　シーラント剤５００は、電極端子端部凹部と外装体７００の折り曲げ部との間に配置されており、電極端子および外装体７００を絶縁する。シーラント剤５００によって、電極端子における電極端子と電極タブとの接続面の反対面と外装体７００の折り曲げ部全周内面との界面がシールされ、封止されている。 <Sealant 500>
The sealant 500 is disposed between the electrode terminal end recess and the bent portion of the exterior body 700 to insulate the electrode terminal and the exterior body 700. The sealant agent 500 seals and seals the interface between the surface of the electrode terminal opposite to the connection surface between the electrode terminal and the electrode tab and the inner surface of the outer periphery of the bent portion 700.
　電極端子および外装体７００の絶縁性を確保するために、シーラント剤５００の積層方向における長さは外装体７００の折り曲げ部より大きく形成されている。シーラント剤５００は、電極端子を囲むようにリング状に形成されている。シーラント剤５００は樹脂などの絶縁材料で形成されている。 In order to ensure the insulation between the electrode terminals and the exterior body 700, the length of the sealant 500 in the stacking direction is formed larger than the bent portion of the exterior body 700. The sealant 500 is formed in a ring shape so as to surround the electrode terminal. Sealant agent 500 is formed of an insulating material such as resin.
　＜折り曲げ用絶縁部材６００＞
　面内方向において、電極体４００の両側に配置されている折り曲げ用絶縁部材６００は一体で形成されている。折り曲げ用絶縁部材６００は電極タブを積層方向に折り曲げるために形成されており、面内方向において折り曲られた電極タブの間に形成されている。 <Bending insulation member 600>
In the in-plane direction, the bending insulating members 600 disposed on both sides of the electrode body 400 are integrally formed. The bending insulating member 600 is formed to bend the electrode tabs in the stacking direction, and is formed between the electrode tabs bent in the in-plane direction.
　積層方向における折り曲げ用絶縁部材６００の下端部は折り曲げられた正極タブ１３０の折り返し部に接している。また、積層方向における折り曲げ用絶縁部材６００の上端部は外装体７００に接している。これにより、積層型二次電池１０００の大きさをコンパクトにできる。また、振動などにより電極端子が電極体４００に接触した場合の電極体４００の損傷を抑制できる。さらに、振動などによる電極端子の積層方向の動きを抑制している。 The lower end of the folding insulating member 600 in the stacking direction is in contact with the folded portion of the folded positive electrode tab 130. The upper end portion of the bending insulating member 600 in the stacking direction is in contact with the exterior body 700. Thereby, the size of the stacked secondary battery 1000 can be made compact. Further, damage to the electrode body 400 when the electrode terminal contacts the electrode body 400 due to vibration or the like can be suppressed. Furthermore, the movement of the electrode terminals in the stacking direction due to vibration or the like is suppressed.
　折り曲げ用絶縁部材６００は、ポリプロピレン（ＰＰ）、ポリブチレンテレフタレート（ＰＢＴ）などの絶縁性樹脂材料で構成されている。 The bending insulating member 600 is made of an insulating resin material such as polypropylene (PP) or polybutylene terephthalate (PBT).
　＜外装体７００＞
　外装体７００は、電極、セパレータ３００、電極タブ、電極端子、シーラント剤５００、折り曲げ用絶縁部材６００を収納する。電極端子をバスバーに電気的に接続させるために、外装体７００の電極端子が形成されている面では、電極端子を露出させるように外装体７００には開口部が形成されている。 <Exterior body 700>
The exterior body 700 houses the electrode, the separator 300, the electrode tab, the electrode terminal, the sealant 500, and the insulating member 600 for bending. In order to electrically connect the electrode terminals to the bus bar, an opening is formed in the exterior body 700 so that the electrode terminals are exposed on the surface of the exterior body 700 where the electrode terminals are formed.
　外装体７００の積層方向端部には折り曲げ部が設けられており、折り曲げ部はシーラント剤５００に接するように形成されている。電極端子および外装体７００は、電極端子における電極タブおよび電極端子の接続面とは反対側の面で、積層方向に延伸する面同士でシールされている。 A folding part is provided at an end in the stacking direction of the exterior body 700, and the folding part is formed so as to be in contact with the sealant agent 500. The electrode terminal and the exterior body 700 are sealed with surfaces extending in the stacking direction on the surface of the electrode terminal opposite to the electrode tab and the connection surface of the electrode terminal.
　外装体７００はチューブ（筒）状に形成されており、外装体７００は、少なくとも表面が絶縁処理されたアルミニウム、ＳＵＳ、ニッケルめっき鋼など、電解質に対する耐食性を備えていることが望ましい。外装体７００は、曲げ、絞り等加工性に優れる材料であることが望ましい。外装体７００は、環状の樹脂材質からなる熱収縮チューブとし、電極体４００等の外装体７００に収納される部材を覆った状態で収縮させてもよい。 The exterior body 700 is formed in a tube shape, and it is desirable that the exterior body 700 has corrosion resistance to an electrolyte such as aluminum, SUS, or nickel-plated steel whose surface is insulated. The exterior body 700 is preferably made of a material having excellent processability such as bending and drawing. The exterior body 700 may be a heat-shrinkable tube made of an annular resin material, and may be contracted in a state where a member housed in the exterior body 700 such as the electrode body 400 is covered.
　図２は、本発明の一実施形態に係る積層型二次電池の製造工程である。図２において、基板２０００上にセパレータ３００が形成された負極２００、セパレータ３００が形成された正極１００を交互に積層させる。電極タブは面内方向へ延伸している。 FIG. 2 shows a manufacturing process of the laminated secondary battery according to the embodiment of the present invention. In FIG. 2, negative electrodes 200 on which separators 300 are formed and positive electrodes 100 on which separators 300 are formed are alternately stacked on a substrate 2000. The electrode tab extends in the in-plane direction.
　図３は、本発明の一実施形態に係る積層型二次電池の製造工程である。図３において、電極タブに折り曲げ用絶縁部材６００を積層方向に押し込むことで、電極タブを束ねる。電極タブは、折り曲げ用絶縁部材６００の電極体４００が形成された側に積層方向で束ねられた部分と、折り曲げ用絶縁部材６００の下部に面内方向で束ねられた部分が存在している。 FIG. 3 shows a manufacturing process of the laminated secondary battery according to the embodiment of the present invention. In FIG. 3, the electrode tabs are bundled by pushing the insulating member 600 for bending into the electrode tabs in the stacking direction. The electrode tab has a portion bundled in the stacking direction on the side where the electrode body 400 of the bending insulating member 600 is formed and a portion bundled in the in-plane direction below the bending insulating member 600.
　図４は、本発明の一実施形態に係る積層型二次電池の製造工程である。図４において、例えば超音波溶接により電極タブと電極端子（電極端子中間凹部）とを接合させる。面内方向に延伸する電極タブのいずれの箇所でも電極タブと電極端子との接合点としてもよいが、積層型二次電池１０００中の全ての電極タブが面内方向で束ねられている部分が、電極タブと電極端子との接合点になることが望ましい。電極端子には電極体４００を封止するためのシーラント剤５００が、積層方向下部に形成されている。 FIG. 4 shows a manufacturing process of the laminated secondary battery according to the embodiment of the present invention. In FIG. 4, an electrode tab and an electrode terminal (electrode terminal intermediate | middle recessed part) are joined, for example by ultrasonic welding. Any part of the electrode tab extending in the in-plane direction may be a junction point between the electrode tab and the electrode terminal, but the portion where all the electrode tabs in the laminated secondary battery 1000 are bundled in the in-plane direction is It is desirable to be a junction point between the electrode tab and the electrode terminal. A sealant 500 for sealing the electrode body 400 is formed on the electrode terminal at the lower part in the stacking direction.
　図５は、本発明の一実施形態に係る積層型二次電池の製造工程である。図５において、電極端子が接合された電極タブを積層方向に折り曲げる。これにより、電極タブと電極端子とが積層方向に延伸する面同士で電気的に接続されることになる。折り曲げられた電極タブは、折り曲げ用絶縁部材６００に接触させてもよいし、積層型二次電池１０００の性能を損なわない範囲で空間を設けてもよい。 FIG. 5 shows a manufacturing process of the laminated secondary battery according to the embodiment of the present invention. In FIG. 5, the electrode tab to which the electrode terminals are joined is bent in the stacking direction. Thereby, an electrode tab and an electrode terminal will be electrically connected by the surfaces extended | stretched in a lamination direction. The bent electrode tab may be brought into contact with the bending insulating member 600, or a space may be provided within a range that does not impair the performance of the stacked secondary battery 1000.
　図６は、本発明の一実施形態に係る積層型二次電池の製造工程である。図６において、外装体７００の端部を折り曲げて、外装体７００の折り曲げ部とシーラント剤５００を接着させることにより、外装体７００と電極端子とで電極体４００を封止させる。シーラント剤５００により外装体７００と電極端子との絶縁性が確保されている。これにより、電極端子における電極端子と電極タブとの接合点とは反対側の面で、外装体７００と電極端子とは積層方向に延伸する面同士でシールされる。 FIG. 6 shows a manufacturing process of the laminated secondary battery according to the embodiment of the present invention. In FIG. 6, the electrode body 400 is sealed by the exterior body 700 and the electrode terminal by bending the end portion of the exterior body 700 and bonding the bent portion of the exterior body 700 and the sealant 500. The sealant 500 ensures the insulation between the exterior body 700 and the electrode terminals. Thereby, the exterior body 700 and the electrode terminal are sealed with the surfaces extending in the stacking direction on the surface of the electrode terminal opposite to the junction point between the electrode terminal and the electrode tab.
　図７は、本発明の一実施形態に係る積層型二次電池の模式図である。図７の積層型二次電池１０００は、図１の積層型二次電池１０００に比べて折り曲げ用絶縁部材６００がない構成、換言すれば、折り曲げられた電極タブの面内方向において空間が設けられている
。折り曲げ用絶縁部材６００がない構成は、図５の工程の後、折り曲げ用絶縁部材６００を積層方向へ取り除くことにより達成される。このような構成により、積層型二次電池１０００を軽量にできる。 FIG. 7 is a schematic view of a stacked secondary battery according to an embodiment of the present invention. The multilayer secondary battery 1000 of FIG. 7 has a configuration without the folding insulating member 600 compared to the multilayer secondary battery 1000 of FIG. 1, in other words, a space is provided in the in-plane direction of the folded electrode tab. ing. The configuration without the folding insulating member 600 is achieved by removing the folding insulating member 600 in the stacking direction after the step of FIG. With such a configuration, the stacked secondary battery 1000 can be reduced in weight.
１００　正極
１１０　正極合剤層
１２０　正極集電体
１３０　正極タブ
１５０　正極端子
１５１　正極端子中間凹部
１５２　正極端子端部凹部
１５３　正極端子突出部
２００　負極
２１０　負極合剤層
２２０　負極集電体
２３０　負極タブ
２５０　負極端子
２５１　負極端子中間凹部
２５２　負極端子端部凹部
２５３　負極端子突出部
３００　セパレータ
４００　電極体
５００　シーラント剤
６００　折り曲げ用絶縁部材
７００　外装体
１０００　積層型二次電池
２０００　基板 100 Positive electrode 110 Positive electrode mixture layer 120 Positive electrode current collector 130 Positive electrode tab 150 Positive electrode terminal 151 Positive electrode terminal intermediate recess 152 Positive electrode terminal end recess 153 Positive electrode terminal protrusion 200 Negative electrode 210 Negative electrode mixture layer 220 Negative electrode current collector 230 Negative electrode tab 250 Negative terminal 251 Negative terminal intermediate recess 252 Negative terminal end recess 253 Negative terminal protrusion 300 Separator 400 Electrode body 500 Sealant agent 600 Bending insulating member 700 Exterior body 1000 Multilayer secondary battery 2000 Substrate

Claims (6)

  1. 　電極が積層されて構成された電極体と、
    　前記電極体に電気的に接続された電極タブと、
    　前記電極タブに電気的に接続された電極端子と、
    　前記電極体および前記電極端子を収納する外装体と、を有し、
    　前記電極タブは折り曲げられており、
    　前記電極タブおよび前記電極端子は、積層方向に延伸する面同士で接続され、
    　前記電極端子および前記外装体は、前記電極端子における前記電極タブおよび前記電極端子の接続面とは反対側の面で、積層方向に延伸する面同士でシールされる積層型二次電池。     An electrode body formed by stacking electrodes;
    An electrode tab electrically connected to the electrode body;
    An electrode terminal electrically connected to the electrode tab;
    An exterior body that houses the electrode body and the electrode terminal,
    The electrode tab is bent;
    The electrode tab and the electrode terminal are connected by surfaces extending in the stacking direction,
    The electrode terminal and the exterior body are stacked secondary batteries that are sealed at surfaces extending in the stacking direction on the surface of the electrode terminal opposite to the connection surface of the electrode tab and the electrode terminal.
  2. 　請求項１の積層型二次電池において、
    　面内方向における折り曲げられた前記電極タブの間に折り曲げ用絶縁部材が形成されている積層型二次電池。     The stacked secondary battery according to claim 1,
    A laminated secondary battery in which a bending insulating member is formed between the electrode tabs bent in an in-plane direction.
  3. 　請求項２の積層型二次電池において、
    　前記折り曲げ用絶縁部材は前記外装体に接している積層型二次電池。     The stacked secondary battery according to claim 2,
    The laminated type secondary battery, wherein the bending insulating member is in contact with the exterior body.
  4. 　請求項２の積層型二次電池において、
    　前記折り曲げ用絶縁部材は折り曲げられた前記電極タブの折り返し部に接している積層型二次電池。     The stacked secondary battery according to claim 2,
    The laminated secondary battery, wherein the folding insulating member is in contact with a folded portion of the folded electrode tab.
  5. 　請求項２の積層型二次電池において、
    　面内方向において、前記電極タブおよび前記電極端子の間に空間が形成され、
    　前記電極タブおよび前記電極端子は、積層方向に延伸する面の一部同士で接続される積層型二次電池。     The stacked secondary battery according to claim 2,
    In the in-plane direction, a space is formed between the electrode tab and the electrode terminal,
    The electrode tab and the electrode terminal are stacked secondary batteries connected by a part of surfaces extending in the stacking direction.
  6. 　請求項１の積層型二次電池において、
    　面内方向における折り曲げられた前記電極タブの間に空間が形成されている積層型二次電池。     The stacked secondary battery according to claim 1,
    A stacked secondary battery in which a space is formed between the electrode tabs bent in an in-plane direction.
PCT/JP2018/007519 2017-04-14 2018-02-28 Laminated secondary battery WO2018190016A1 (en)

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