WO2017090391A1 - 電気化学デバイス - Google Patents
電気化学デバイス Download PDFInfo
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- WO2017090391A1 WO2017090391A1 PCT/JP2016/082515 JP2016082515W WO2017090391A1 WO 2017090391 A1 WO2017090391 A1 WO 2017090391A1 JP 2016082515 W JP2016082515 W JP 2016082515W WO 2017090391 A1 WO2017090391 A1 WO 2017090391A1
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- support tab
- electrochemical device
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- electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/74—Terminals, e.g. extensions of current collectors
- H01G11/76—Terminals, e.g. extensions of current collectors specially adapted for integration in multiple or stacked hybrid or EDL capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
- H01G11/72—Current collectors specially adapted for integration in multiple or stacked hybrid or EDL capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
- H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
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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
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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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 of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
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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 of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/121—Organic material
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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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
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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
- H01M50/531—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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/562—Terminals characterised by the material
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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 of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
- H01M50/126—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure comprising three or more layers
- H01M50/129—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic material
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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
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
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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
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
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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
- 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 an electrochemical device.
- Secondary batteries which are examples of electrochemical devices, are used in various fields such as power supplies for portable electronic devices such as mobile phones and smartphones, digital cameras, and notebook personal computers, and power supplies for vehicles and households (power storage facilities). Demand is growing.
- lithium ion secondary batteries which are examples of non-aqueous electrolyte secondary batteries that can be repeatedly charged and discharged, are energy storage devices that are indispensable for daily life because of their high energy density, light weight, and excellent charge / discharge cycle characteristics. It has become.
- an electrode laminate composed of two types of electrodes (a positive electrode and a negative electrode) alternately laminated via separators is housed in an outer container, and an electrode of the electrode laminate is obtained. Is connected to an electrode terminal (electrode lead), and this electrode terminal extends to the outside of the outer container.
- a flexible container made of a flexible film having a high degree of freedom of shape has been adopted as an outer case of a non-aqueous electrolyte secondary battery instead of a metal can having a low degree of freedom of shape.
- a general flexible film is a laminate film in which resin layers are laminated on both sides of a metal foil.
- An exterior container made of a flexible film can be in close contact with the outer surface of the electrode laminate with almost no gap, and it is possible to improve the energy density per unit volume and improve the volume efficiency by reducing the thickness.
- Patent Documents 1 and 2 disclose secondary batteries (film-covered batteries) having an exterior container made of such a flexible film.
- a support tab (protective lead) is arranged on the electrode tab in a state where a part of the electrode (electrode tab) is overlaid on the electrode terminal (electrode lead). . And in a state where the electrode tab is sandwiched between the support tab and the electrode terminal, they are joined together. Providing the support tab improves the reliability of the connection between the electrode tab and the electrode terminal, and can prevent damage during joining.
- the outer container made of a flexible film is inferior in strength to the outer container made of a metal can. That is, the flexible film is easily damaged. If the flexible film is damaged, there is a possibility that an electrical short circuit inside the electrochemical device or leakage of the electrolytic solution may occur.
- the support tab used in Patent Document 2 is thinner than the electrode terminal, and tends to warp when a member such as a horn or anvil is pressed against it. And the support tab in the curved state may damage the flexible film constituting the exterior container from the inside.
- the present invention has been made in view of these problems, and an object thereof is to provide an electrochemical device that has good energy density and volumetric efficiency and has a low risk of damage to a flexible film constituting an exterior container. To do.
- a feature of the present invention is that it has a power storage element in which two types of electrodes overlap with each other through a separator, and an outer container made of a flexible film that stores the power storage element and an electrolyte solution.
- each of two types of electrodes has one end part of an outer container.
- An electrode terminal that is overlapped with the uncoated part of the electrode inside and the other end extends to the outside of the outer container, and a support tab that sandwiches the uncoated part together with one end of the electrode terminal inside the outer container are provided.
- the uncoated portion, the electrode terminal, and the support tab are joined to each other at an overlapping position, and the support tab has a planar shape that does not include a corner portion of at least 90 degrees or less.
- the energy density and volumetric efficiency are good by using an exterior container made of a flexible film, and the risk of damaging the flexible film constituting the exterior container is small and reliable.
- a highly electrochemical device can be provided.
- FIG. 2 is a top view showing the basic structure of the secondary battery which is one Embodiment of the electrochemical device of this invention. It is the sectional view on the AA line of FIG.
- FIG. 2 is an enlarged cross-sectional view showing a main part of a positive electrode of the secondary battery shown in FIGS. 1a and 1b.
- FIG. 2 is an enlarged cross-sectional view showing a main part of a negative electrode of the secondary battery shown in FIGS. 1a and 1b.
- FIG. 2 is an enlarged plan view showing a support tab of the secondary battery shown in FIGS. 1a and 1b.
- FIG. 2 is a side view showing a step for connecting an electrode tab and an electrode terminal of the secondary battery shown in FIGS. 1a and 1b.
- FIG. 6 is a side view showing a step following FIG. 5.
- FIG. 7 is a plan view illustrating a process following the process in FIG. 6.
- FIG. 6 is an enlarged plan view showing a modification of the support tab of the secondary battery shown in FIGS. 1a and 1b.
- FIG. 7 is an enlarged plan view showing another modification of the support tab of the secondary battery shown in FIGS. 1a and 1b.
- FIG. 1a and 1b schematically show a film-covered secondary battery which is an embodiment of the electrochemical device of the present invention.
- FIG. 1a is a plan view seen from above perpendicular to the main surface (flat surface) of the secondary battery
- FIG. 1b is a sectional view taken along line AA of FIG. 1a.
- FIG. 2 is an enlarged cross-sectional view of the main part of the positive electrode
- FIG. 3 is an enlarged cross-sectional view of the main part of the negative electrode.
- the film-covered secondary battery 1 of the present invention includes an electrode laminate (electric storage element) 17 in which two types of electrodes, that is, a positive electrode (positive electrode sheet) 2 and a negative electrode (negative electrode sheet) 3 are overlapped with a separator 4 interposed therebetween. .
- the electricity storage element 17 is housed in an outer container 14 made of a flexible film (laminate film) 6 together with the electrolytic solution 5.
- One end of the positive electrode terminal 7 is connected to the positive electrode 2 of the power storage element 17, and one end of the negative electrode terminal 8 is connected to the negative electrode 3.
- the other end portion of the positive electrode terminal 7 and the other end portion of the negative electrode terminal 8 are each drawn out of the exterior container 14 made of the flexible film 6.
- each layer constituting the power storage element 17 a part of each layer constituting the power storage element 17 (a layer located at an intermediate portion in the thickness direction) is omitted from the illustration, and the electrolytic solution 5 is shown.
- the positive electrode 2, the negative electrode 3, the separator 4, and the flexible film 6 are illustrated so as not to be in contact with each other. .
- the positive electrode 2 includes a positive electrode current collector (positive electrode current collector) 9, and a positive electrode active material layer (positive electrode active material layer) 10 applied to the positive electrode current collector 9. including.
- the front and back surfaces of the positive electrode current collector 9 have a coated portion where the positive electrode active material layer 10 is formed and an uncoated portion where the positive electrode active material layer 10 is not formed.
- the negative electrode 3 includes a negative electrode current collector (negative electrode current collector) 11 and a negative electrode active material layer (negative electrode active material layer) 12 applied to the negative electrode current collector 11.
- the negative electrode current collector 11 has a coated portion and a non-coated portion on the front and back surfaces.
- the uncoated portions (current collectors 9 and 11) of the positive electrode 2 and the negative electrode 3 are used as electrode tabs (positive electrode tab and negative electrode tab) for connection with electrode terminals (positive electrode terminal 7 and negative electrode terminal 8).
- uncollected current collectors of the same type of electrode are superposed on each other to form an aggregate. That is, the positive electrode tabs of the positive electrode 2 (the positive electrode current collector 9 of the uncoated portion) are gathered together on one end portion of the positive electrode terminal 7 to form a collective portion, and this collective portion is a metal piece (support tab) 13 and the positive electrode It is sandwiched between the terminals 7 and all of them are connected to each other by ultrasonic welding or the like at a position where they overlap each other.
- the negative electrode tabs of the negative electrode 3 are gathered together on one end part of the negative electrode terminal 8 to form a collective part. It is sandwiched between the negative electrode terminal 8 and all of them are connected to each other by ultrasonic welding or the like at a position where they overlap each other.
- the other end of the positive electrode terminal 7 and the other end of the negative electrode terminal 8 extend to the outside of the outer container 14 made of the flexible film 6.
- the support tab 13 shown in FIG. 4 prevents damage to the electrode tabs (current collectors 9 and 11) and improves the reliability of the connection between the electrode tab and the electrode terminals (the positive electrode terminal 7 and the negative electrode terminal 8). It is desirable to be thin, strong and resistant to the electrolyte 5.
- the support tab 13 has a thickness of about 60 ⁇ m to 150 ⁇ m, for example, and has a planar shape that does not have a corner of at least 90 degrees or less, preferably a portion where two straight sides intersect at one point (corner) Has a planar shape that does not exist at all.
- a support tab 13 having a shape in which four rectangular corner portions 13a are rounded (rounded rectangular shape) is used.
- the radius of curvature of the rounded portion is 1.0 to 2.0 mm.
- Preferred materials for forming the support tab 13 include aluminum, nickel, copper, stainless steel (SUS), and the like.
- the outer dimension of the coating part (negative electrode active material layer 12) of the negative electrode 3 is larger than the outer dimension of the coating part (positive electrode active material layer 10) of the positive electrode 2 and smaller than or equal to the outer dimension of the separator 4.
- examples of the active material constituting the positive electrode active material layer 10 include LiCoO 2 , LiNiO 2 , LiMn 2 O 2 , Li 2 MO 3 —LiMO 2 , LiNi 1/3 Co 1/3.
- Layered oxide materials such as Mn 1/3 O 2 , spinel materials such as LiMn 2 O 4 , olivine materials such as LiMPO 4 , fluoride olivine materials such as Li 2 MPO 4 F and Li 2 MSiO 4 F
- examples thereof include vanadium oxide materials such as materials and V 2 O 5 .
- a part of elements constituting these active materials may be substituted with other elements, and Li may have an excessive composition.
- One or a mixture of two or more of these active materials can be used.
- carbon materials such as graphite, amorphous carbon, diamond-like carbon, fullerene, carbon nanotube, and carbon nanohorn, lithium metal materials, alloy materials such as silicon and tin, An oxide material such as Nb 2 O 5 or TiO 2 or a composite thereof can be used.
- the active material mixture constituting the positive electrode active material layer 10 and the negative electrode active material layer 12 is obtained by appropriately adding a binder, a conductive auxiliary agent, or the like to each of the active materials described above.
- a conductive support agent 1 type in carbon black, carbon fiber, or graphite can be used, or a combination of 2 or more types can be used.
- the binder polyvinylidene fluoride, polytetrafluoroethylene, carboxymethylcellulose, modified acrylonitrile rubber particles, and the like can be used.
- the positive electrode current collector 9 aluminum, stainless steel, nickel, titanium, or an alloy thereof can be used, and aluminum is particularly preferable.
- the negative electrode current collector 11 copper, stainless steel, nickel, titanium, or an alloy thereof can be used.
- Examples of the electrolytic solution 5 include cyclic carbonates such as ethylene carbonate, propylene carbonate, vinylene carbonate, butylene carbonate, ethyl methyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), and the like.
- cyclic carbonates such as ethylene carbonate, propylene carbonate, vinylene carbonate, butylene carbonate, ethyl methyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), and the like.
- One or more organic solvents such as chain carbonates, aliphatic carboxylic acid esters, ⁇ -lactones such as ⁇ -butyrolactone, chain ethers, cyclic ethers, etc. Mixtures can be used.
- lithium salts can be dissolved in these organic solvents.
- the separator 4 is mainly composed of a resin porous film, woven fabric, non-woven fabric, etc., and as its resin component, for example, polyolefin resin such as polypropylene and polyethylene, polyester resin, acrylic resin, styrene resin, nylon resin, aramid resin (aromatic resin) Polyamide resin), polyimide resin, or the like can be used.
- a polyolefin-based microporous membrane is preferable because of its excellent ion permeability and performance of physically separating the positive electrode and the negative electrode.
- the inorganic particles include insulating oxides, nitrides, sulfides, carbides, etc. Among them, it is preferable that TiO 2 or Al 2 O 3 is included.
- the exterior container 14 is a lightweight exterior case made of the flexible film 6.
- An example of the flexible film 6 is a laminate film in which resin layers are provided on both surfaces of a metal foil serving as a base material.
- a metal layer having a barrier property for preventing leakage of the electrolytic solution 5 or entry of moisture from the outside can be selected, and aluminum, stainless steel, or the like can be used.
- At least one surface of the metal foil is provided with a heat-fusible resin layer such as a modified polyolefin.
- the exterior container 14 is formed by making the heat-fusible resin layers of the flexible film 6 face each other and heat-sealing the periphery of the portion that houses the electricity storage element 17.
- a resin layer such as a nylon film, a polyethylene terephthalate film, or a polyester film can be provided on the surface of the metal foil opposite to the surface on which the heat-fusible resin layer is formed, as the outer container surface.
- the positive electrode terminal 7 can be made of aluminum or an aluminum alloy
- the negative electrode terminal 8 can be made of copper, a copper alloy, nickel plated on these, nickel, or the like.
- the other end side of each terminal 7, 8 is drawn out of the outer container 14.
- a heat-sealable resin (sealing material) can be provided in advance at locations corresponding to the portions of the terminals 7 and 8 that are thermally welded to the outer peripheral portion of the outer container 14.
- any of the positive electrode active material layer 10 and the negative electrode active material layer 12 for example, inevitable inclination, unevenness, roundness, etc. of each layer due to manufacturing variations and layer forming ability may occur.
- the electrodes 2 and 3 for the secondary battery are manufactured.
- the positive electrode active material layers 10 are respectively formed on both surfaces of the positive electrode current collector 9.
- the end of the coated part (positive electrode active material layer 10) at the boundary with the uncoated part may be substantially perpendicular to the positive electrode current collector 9, and the center of the positive electrode active material layer 10 may be It may be in the form of a slope or step where the thickness is reduced compared to the part.
- negative electrode active material layers 12 are formed on both surfaces of the negative electrode current collector 11, respectively.
- the end portion of the negative electrode active material layer 12 may stand substantially perpendicular to the negative electrode current collector 11 and is thicker than the central portion of the negative electrode active material layer 12. It may be sloped or stepped to reduce the height.
- the positive electrode 2 and the negative electrode 3 thus formed are alternately stacked via the separator 4, and the positive electrode terminal 7 and the negative electrode terminal 8 are connected.
- the connection process of the positive terminal 7 and the negative terminal 8 will be described in detail.
- the positive electrode tabs (positive electrode current collectors 9) of a plurality of positive electrodes 2 are closely overlapped on one end of the positive electrode terminal 7, and a metal piece (support tab) 13 is further stacked thereon. Deploy. These are joined together.
- joining by ultrasonic welding is often employed.
- the horn 15 and the anvil 19 are pressed against the positive electrode terminal 7 and the support tab 13 sandwiching the plurality of positive electrode tabs, respectively, and subjected to ultrasonic welding by applying vibration while applying pressure.
- the thickness of the positive electrode current collector 9 constituting the positive electrode tab is as small as about several ⁇ m to 20 ⁇ m, if ultrasonic welding is performed in a state where the positive electrode current collector 9 is in direct contact with or close to the horn 15 or the anvil 19, When the positive electrode current collector 9 is peeled off from the horn 15 or the anvil 19, it may stick to the horn 15 or the anvil 19.
- the positive electrode current collector 9 in one outermost layer of the power storage element 17 is not attached to the anvil 19 because it contacts the anvil 19 via the relatively thick positive electrode terminal 7. However, if the other outermost positive electrode current collector 9 directly contacts the horn 15, it may stick to the horn 15 and be damaged.
- the support tab 13 (having a thickness of about 60 ⁇ m to 150 ⁇ m) thicker than the positive electrode current collector 9 (having a thickness of about several ⁇ m to 20 ⁇ m) is connected to the positive electrode current collector 9 and the horn 15. It is arranged between. From such circumstances, the planar shape of the support tab 13 is such that the horn 15 does not protrude outside the support tab 13 and directly contact the positive electrode current collector 9 even if a slight positional deviation occurs. It must be larger than the planar shape of the abutting portion. As a result, there are unwelded portions that are not ultrasonically welded around the joint portion 16 (three locations in the example shown in FIG. 7) by ultrasonic welding of the support tab 13.
- the support tab 13 has a planar shape including a corner portion (a portion where two straight sides meet at one point), the support tab 13 is lifted, so that the corner portion is flexible film 6.
- the flexible film 6 may be damaged.
- the support tab 13 has a sharp corner of 90 degrees or less, there is a high possibility that the corner contacts the flexible film 6 and is damaged.
- an electrical short circuit may occur between the positive electrode 2 or the negative electrode 3 of the electricity storage element 17.
- the damage of the flexible film 6 is large, the electrolyte solution 5 accommodated in the exterior container 14 may leak outside.
- the support tab 13 of the present invention has a planar shape in which the corner portion 13a is rounded without a corner portion (a portion where two straight sides intersect at one point), the shape of the support tab 13 is deformed. Even if a part of the film floats and comes into contact with the flexible film 6, the risk of damaging the flexible film 6 is small. Therefore, the electrical short circuit mentioned above and the production
- the positive electrode terminal 7 Since the positive terminal 7 with which the anvil 19 abuts is thicker and stronger than the support tab 13, the warping deformation is small and the risk of damaging the flexible film 6 is small.
- the positive electrode terminal 7 has a planar shape in which there is no corner at the end close to the power storage element 17 (a shape in which the corner 7 a at the end close to the power storage element 17 is rounded). It is preferable that the flexible film 6 is prevented from being damaged. Further, a protective insulating tape (not shown) may be affixed on the support tab 13.
- the above description relates to the case where the anvil 19 is brought into contact with the positive electrode terminal 7 and the horn 15 is disposed on the opposite side to perform ultrasonic welding.
- the horn 15 and the anvil 19 can be replaced with each other.
- the horn 15 described above may be read as the anvil 19 and the anvil 19 may be read as the horn 15.
- the aggregated portion in which a plurality of uncoated portions (negative electrode current collectors) 11 are stacked is sandwiched between the support tab 13 and the negative electrode terminal 8.
- the support tab 13 has a planar shape in which there is no corner (a portion where two straight sides intersect at one point), and the risk of damaging the flexible film 6 is small. The possibility of causing problems such as an electrical short circuit and leakage of the electrolyte 5 is small.
- the negative electrode terminal 8 is formed in a planar shape having no corners at the end portion close to the power storage element 17 (a shape in which the corner portion at the end close to the power storage element 17 is rounded), and is flexible. Damage to the conductive film 6 is more reliably prevented. Further, a protective insulating tape (not shown) may be affixed on the support tab 13.
- the positive electrode terminal 7 is connected to the uncoated part (positive electrode current collector 9) of the positive electrode 2 and the negative electrode terminal 8 is connected to the uncoated part (negative electrode current collector 11) of the negative electrode 3 to complete the storage.
- the element 17 is accommodated together with the electrolytic solution 5 in an exterior container made of the flexible film 6. Then, the positive electrode terminal 7 and the negative electrode terminal 8 extending to the outside of the outer container 14 are flexible via a sealing material (sealant) 18 (not shown in FIGS. 5 and 6) provided in advance on the electrode terminals 7 and 8.
- the outer peripheral portions of the flexible film 6 are thermally welded to each other, thereby The packaged outer container 14 is sealed to complete the secondary battery 1 shown in FIGS. 1a and 1b.
- the support tab 13 when the support tab 13, the uncoated portion (current collectors 9, 11), and the electrode terminals 7, 8 are joined, the support tab 13 is partially deformed so as to be lifted.
- the four corner portions 13a of the support tab 13 are not corner portions where two straight sides intersect at one point, but are rounded shapes, so that the flexible film 6 resulting from deformation of the support tab 13 is used. Damage is suppressed.
- an electrical short circuit between the metal foil of the inner layer of the flexible film 6 and the electrodes 2 and 3 and the generation of an alloy associated therewith are suppressed, and the performance degradation as the battery and the fluid (electrolyte solution) from the exterior container 14 are suppressed.
- the risk of leakage in 5) can be reduced.
- a protective lead (support tab) shown in FIG. 1 of Patent Document 2 may be rounded from the end in the thickness direction toward the center. Conceivable.
- the support tab is thin (for example, the thickness is about 60 ⁇ m to 150 ⁇ m)
- the work of rounding from the end in the thickness direction toward the center is very difficult and almost impossible.
- the change in shape is very small compared to the case where rounding is not performed, and it has a great effect. Cannot be expected.
- the support tab 13 of the present invention is thin (thickness is about 60 ⁇ m to 150 ⁇ m) so that it can be firmly joined to the electrode tab and the electrode terminal by ultrasonic welding or the like.
- the process of rounding in a planar shape is very simple. In the present invention, forming the support tab 13 in a planar shape that does not include a corner portion of at least 90 degrees or less is much easier to work than rounding from the end in the thickness direction toward the center.
- the support tab 13 of the present invention has a planar shape that does not include at least 90 degrees of corners, the work of rounding from the end in the thickness direction toward the center is not required. Also, the effect of preventing damage to the flexible film 6 is obtained, and the workability is very good.
- the support tab 13 of the present invention has a corner portion (a portion where two straight sides meet at one point) of at least 90 degrees, in other words, a sharp point. What is necessary is just to have the planar shape which does not contain the part (pointed part).
- the modification of the support tab 13 is not limited to a substantially square shape as shown in FIGS. 4 and 7, but as shown in FIG. 8a, two parallel straight line ends are connected to each other by an arc, or FIG. 8b. Those having an elliptical planar shape as shown in FIG.
- an electrode stack in which a plurality of positive electrodes 2 and a plurality of negative electrodes 3 are alternately and repeatedly stacked via separators 4 is used as the electricity storage element 17.
- a wound body in which one long positive electrode 2 and one long negative electrode 3 are wound in a state of being overlapped via a separator 4 can be used as the electricity storage element 17.
- the present invention is particularly useful for lithium ion secondary batteries, but is also effective when applied to secondary batteries other than lithium ion batteries and electrochemical devices other than batteries such as capacitors (capacitors).
- Film-coated secondary battery (electrochemical device) 2 Positive electrode (positive electrode sheet) 3 Negative electrode (negative electrode sheet) 4 Separator 5 Electrolyte 6 Flexible film (laminate film) 7 Positive terminal (electrode terminal) 7a, 13a Rounded corner 8 Negative terminal (electrode terminal) 9 Current collector for positive electrode (positive electrode current collector) 10 Active material layer for positive electrode (positive electrode active material layer) 11 Current collector for negative electrode (negative electrode current collector) 12 Active material layer for negative electrode (negative electrode active material layer) 13 Metal piece (support tab) 14 exterior container 15 horn 16 joint 17 power storage element (electrode laminate) 18 Sealant 19 Anvil
Abstract
Description
[二次電池の構成]
図1a,1bは、本発明の電気化学デバイスの一実施形態であるフィルム外装二次電池を模式的に示している。図1aは二次電池の主面(平坦な面)に対して垂直上方から見た平面図であり、図1bは図1aのA-A線断面図である。図2は正極の要部の拡大断面図、図3は負極の要部の拡大断面図である。
二次電池の製造にあたって、まず二次電池用の電極2,3を製造する。具体的には、図2に示すように、正極集電体9の両面に正極活物質層10をそれぞれ形成する。未塗布部との境界部分における塗布部(正極活物質層10)の端部は、正極集電体9に対して実質的に垂直に切り立っていてもよく、また、正極活物質層10の中央部と比べて厚さが低減する斜面状または階段状であってもよい。また、図3に示すように、負極集電体11の両面に負極活物質層12をそれぞれ形成する。負極活物質層12の端部(塗布部の端部)は、負極集電体11に対して実質的に垂直に切り立っていてもよく、また、負極活物質層12の中央部と比べて厚さが低減する斜面状または階段状であってもよい。このようにして形成された正極2と負極3とを、セパレータ4を介して交互に積層し、正極端子7および負極端子8を接続する。
2 正極(正極シート)
3 負極(負極シート)
4 セパレータ
5 電解液
6 可撓性フィルム(ラミネートフィルム)
7 正極端子(電極端子)
7a,13a 丸められたコーナー部
8 負極端子(電極端子)
9 正極用の集電体(正極集電体)
10 正極用の活物質層(正極活物質層)
11 負極用の集電体(負極集電体)
12 負極用の活物質層(負極活物質層)
13 金属片(サポートタブ)
14 外装容器
15 ホーン
16 接合部
17 蓄電要素(電極積層体)
18 封止材(シーラント)
19 アンビル
Claims (8)
- 2種類の電極がセパレータを介して重なり合う蓄電要素と、前記蓄電要素と電解液とを収容する可撓性フィルムからなる外装容器とを有し、前記2種類の電極はいずれも、集電体上に活物質層が形成された塗布部と、前記活物質層が形成されていない未塗布部とを有する、電気化学デバイスであって、
前記2種類の電極の各々に、一端部が前記外装容器の内部で前記電極の前記未塗布部と重ね合わせられ、他端部が前記外装容器の外部に延びている電極端子と、前記外装容器の内部において前記電極端子の前記一端部とともに前記未塗布部を挟み込むサポートタブとがそれぞれ設けられ、前記未塗布部と前記電極端子と前記サポートタブとは互いに重なり合う位置で互いに接合されており、
前記サポートタブは、少なくとも90度以下の角部を含まない平面形状を有している、電気化学デバイス。 - 前記サポートタブは、2つの直線状の辺が1点で交わる部分を含まない平面形状を有している、請求項1に記載の電気化学デバイス。
- 同じ種類の複数の前記電極の前記未塗布部が互いに重ね合わせられて集合部を構成しており、該集合部が、前記電極端子の前記一端部と前記サポートタブとに挟み込まれた状態で、前記集合部と前記電極端子と前記サポートタブとが互いに重なり合う位置で互いに接合されている、請求項1または2に記載の電気化学デバイス。
- 前記サポートタブは、四角形の4つのコーナー部が丸み付けられた平面形状を有している、請求項1から3のいずれか1項に記載の電気化学デバイス。
- 丸み付けられた前記コーナー部の曲率半径は1.0mm~2.0mmである、請求項4に記載の電気化学デバイス。
- 前記サポートタブは、2本の平行な直線の端部がそれぞれ円弧によって互いに接続された平面形状を有している、請求項1から3のいずれか1項に記載の電気化学デバイス。
- 前記サポートタブは、楕円形の平面形状を有している、請求項1から3のいずれか1項に記載の電気化学デバイス。
- 前記電気化学デバイスは二次電池である、請求項1から7のいずれか1項に記載の電気化学デバイス。
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DE102016225252A1 (de) * | 2016-12-16 | 2018-06-21 | Robert Bosch Gmbh | Elektrischer Energiespeicher, insbesondere Batteriezelle, mit Bauraum-optimierter Elektrodenverschaltung |
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