WO2017098995A1 - Dispositif électrochimique et procédé de sa fabrication - Google Patents

Dispositif électrochimique et procédé de sa fabrication Download PDF

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Publication number
WO2017098995A1
WO2017098995A1 PCT/JP2016/085799 JP2016085799W WO2017098995A1 WO 2017098995 A1 WO2017098995 A1 WO 2017098995A1 JP 2016085799 W JP2016085799 W JP 2016085799W WO 2017098995 A1 WO2017098995 A1 WO 2017098995A1
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WIPO (PCT)
Prior art keywords
electrochemical device
flexible film
flexible
overlap
flexible films
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PCT/JP2016/085799
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English (en)
Japanese (ja)
Inventor
斉藤　守
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Ｎｅｃエナジーデバイス株式会社
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Priority to JP2017555034A priority Critical patent/JPWO2017098995A1/ja
Publication of WO2017098995A1 publication Critical patent/WO2017098995A1/fr

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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
    • H01G11/80—Gaskets; Sealings
    • 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
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M50/14—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors
    • H01M50/141—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors for protecting against humidity
    • 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
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • 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 an electrochemical device and a manufacturing method thereof.
  • 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.
  • a power storage element in which two types of electrodes (a positive electrode and a negative electrode) are superimposed via a separator is housed in an outer container, and each electrode of the power storage element serves as an electrode terminal. This electrode terminal is connected to the outside of the outer container.
  • Patent Documents 1 to 6 disclose secondary batteries (film-covered secondary batteries) having an exterior container made of such a flexible film.
  • the electricity storage element When forming an exterior container that is in close contact with the electricity storage element, the electricity storage element is covered with a flexible film from above and below its main surface (flat surface), and the flexible films that overlap on the outside of the outer peripheral edge of the electricity storage element It is sealed by bonding.
  • the flexible film which comprises an exterior container is a laminate film in which the resin layer was formed on both surfaces of metal foil, and the resin layer located inside consists of heat-fusible resin. The flexible films are superposed so that the inner resin layers made of the heat-fusible resin are in contact with each other, and are joined to each other by being heated and heat-sealed.
  • the electricity storage element and the electrolyte are accommodated in the exterior container.
  • the flexible films are joined to each other at a position as close as possible to the outer peripheral edge of the power storage element.
  • the electrolytic solution intervenes between the flexible films to be overlapped. If the joint between the flexible films is located away from the outer peripheral edge of the electricity storage element, a space that can hold the electrolyte between the joint between the flexible films and the outer peripheral edge of the electricity storage element Therefore, it is possible to prevent the electrolytic solution from being interposed between the flexible films to be overlapped.
  • the electrolytic solution protrudes outside the electrode laminate. There is no space for holding the electrolyte, and there is a high possibility that the electrolytic solution is interposed between the flexible films to be stacked. Since the portion where the electrolytic solution intervenes between the flexible films to be overlaid is in an unsealed state, if the area of the portion where the electrolytic solution intervenes is large, the reliability of sealing of the outer container is impaired, There is a risk that leakage of the electrolyte from the inside of the outer container or intrusion of water vapor or the like from the outside of the outer container may occur.
  • Patent Document 1 discloses a configuration in which a secondary battery outer container (encapsulation bag) is doubled. However, in the configuration, the energy density and volume efficiency per unit volume of the secondary battery are deteriorated.
  • Patent Document 2 discloses a configuration in which the area of the joint is increased by folding the overlapped flexible film to increase the sealing reliability of the outer container. However, in that configuration, an unnecessarily large flexible film is used, which hinders material savings and manufacturing cost reduction.
  • Patent Document 3 discloses a configuration in which a sealing auxiliary member that covers a joint portion between overlapped flexible films is added.
  • a sealing auxiliary member that covers a joint portion between overlapped flexible films is added.
  • the number of parts and man-hours increase, and the manufacturing cost increases.
  • Patent Document 4 there is a method of extruding an electrolyte solution interposed between flexible films to be overlapped by heat sealing while sequentially applying pressure from the center side of the secondary battery toward the outside. It is disclosed. However, at the same time as the electrolyte is pushed out by heat sealing, the heat-fusible resin that forms the resin layer inside the flexible film softens and moves outward from the center side of the secondary battery. It is done. As a result, in the portion where the flexible films are overlapped with each other, near the center of the secondary battery, a portion with a small (thin) inner resin layer (heat-fusible resin) is generated. End up.
  • the inner resin layer heat-fusible resin
  • the sealing reliability of the outer container is impaired. That is, in the method of extruding the electrolyte solution to the outside by heat sealing as in Patent Document 4, even if the electrolyte solution can be prevented from intervening at the joint between the overlapped flexible films, the inner resin layer By reducing the thickness of the (heat-fusible resin), the sealing reliability is impaired. Furthermore, the inner resin layer (heat-fusible resin) becomes too thin, and the metal foil (for example, aluminum) may be exposed and electrically short-circuited with the positive electrode or the negative electrode.
  • the metal foil for example, aluminum
  • the metal foil for example, aluminum
  • the electrode for example, the negative electrode
  • the inner resin layer (heat-fusible resin) of the overlapped flexible film is prevented from being thinned, and intrusion of water vapor or the like from the outside of the outer container is prevented.
  • a configuration is proposed. Specifically, the inner resin layer (heat-bonding resin) is thickly formed at a portion near the center of the secondary battery where the flexible films are overlapped, and the inner portion is partially The resin layer (heat-fusible resin) is prevented from becoming thin.
  • the present invention has been made in view of these problems, and an object of the present invention is to provide an electrochemical device having a high energy density and volumetric efficiency and a high reliability for sealing an outer container, and a method for producing the same.
  • a feature of the present invention is an electrochemical device having an electricity storage element in which two types of electrodes overlap with each other through a separator, and an exterior container made of a flexible film containing the electricity storage element and an electrolyte solution.
  • At least a part of the container is formed with a storage portion for holding the electrolytic solution.
  • an electrochemical device having high energy density and volumetric efficiency and high reliability for sealing an outer container can be obtained.
  • 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 a plan view schematically showing an enlarged main part of a flexible film constituting an outer container of the secondary battery shown in FIGS. 1a and 1b.
  • FIG. 2 is a cross-sectional view schematically showing an enlarged main part of a flexible film constituting an outer container of the secondary battery shown in FIGS. 1a and 1b. It is a top view which shows 1 process of the manufacturing method of the electrochemical device of this invention. It is a top view which shows the subsequent process of the manufacturing method shown in FIG. It is a top view which shows 1 process of the modification of the manufacturing method of the electrochemical device of this invention. It is a top view which shows the subsequent process of the manufacturing method shown in FIG.
  • FIG. 10 is a plan view showing a subsequent step in the manufacturing method shown in FIGS.
  • FIG. 11 is a plan view showing a subsequent step in the manufacturing method shown in FIGS. 8 to 10.
  • FIG. 1a and 1b schematically show a film-covered secondary battery 1 which is an embodiment of the electrochemical device of the present invention.
  • FIG. 1a is a plan view of the main surface (flat surface) of the secondary battery 1 viewed from vertically above
  • FIG. 1b is a cross-sectional view taken along line AA of FIG. 1a.
  • FIG. 2 is an enlarged cross-sectional view of the main part 2 of the positive electrode
  • FIG. 3 is an enlarged cross-sectional view of the main part of the negative electrode 3.
  • 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 alternately overlapped via a separator 4. ing.
  • the electrode laminate 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 a positive electrode terminal 7 is connected to the positive electrode 2 of the electrode laminate 17, and one end of a 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.
  • the electrolyte solution 5 is shown by omitting a part of each layer constituting the electrode laminate 17 (a layer located in an intermediate portion in the thickness direction).
  • 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).
  • electrode tabs positive electrode tab and negative electrode tab
  • FIG. 1b uncollected current collectors of the same type of electrode are superposed on each other to form an aggregate. That is, as shown in FIG. 4, 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 an aggregate portion, and this aggregate portion is a metal piece.
  • the support tab 13 is sandwiched between the positive electrode terminal 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 portion of the negative electrode terminal 8 to form a collective portion, and this collective portion is connected to the metal piece (support tab) 13 and 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 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.
  • the electrode laminate 17 is covered with the flexible film 6 from above and below the main surface (flat surface), and the flexible films 6 that overlap on the outer periphery of the electrode laminate 17 are overlapped. Are joined and sealed. As a result, an outer container 14 that houses the electrode laminate 17 and the electrolyte 5 is formed.
  • the flexible film 6 is a laminate film in which resin layers 6b and 6c are provided on both surfaces of a metal foil 6a serving as a base material, and at least the inner resin layer 6b is made of a heat-melting material such as a modified polyolefin. Made of adhesive resin.
  • the accommodating part 15 which can accommodate a small amount of electrolyte 5 is formed in a part of the flexible film 6 which overlaps and is joined by heat fusion in this way. That is, as shown in FIGS. 5a and 5b, in a part of the outer peripheral edge of the outer container 14, a plurality of small dents are formed in a portion to be a joint of the flexible film 6, and these dents are formed.
  • Each is a container 15 for the electrolytic solution 5.
  • the joints are shown hatched in FIGS. 5a and 6-11. However, in FIGS. 1b to 4b, the cross section is shown by hatching.
  • the function of the accommodating part 15 provided in the part used as the junction part of the flexible film 6 is demonstrated in detail. If there is a sufficient gap between the portion where the flexible films 6 overlap each other and the outer peripheral edge of the electrode laminate 17, the gap accommodates the electrolytic solution 5 protruding from the electrode laminate 17. Therefore, the electrolytic solution 5 does not enter the portion where the flexible films 6 overlap each other. However, in order to reduce the size of the secondary battery 1 and improve the energy density and volume efficiency, the portions where the flexible films 6 overlap each other and the outer peripheral edge of the electrode laminate 17 are as close as possible. There is not enough space between them to accommodate the electrolytic solution 5. Therefore, the electrolytic solution 5 is likely to enter the portion where the flexible films 6 overlap each other.
  • the accommodating portion 15 that holds the electrolytic solution 5 protruding from the electrode laminate 17 is a portion where the flexible films 6 overlap each other. It is formed in advance. Thereby, the shape, area, and pitch of the part which the electrolyte solution 5 occupies in the part where the flexible films 6 overlap can be controlled. That is, a plurality of small areas are formed in the joint portion between the flexible films 6 by reducing the size of each of the recessed storage portions 15 formed in advance and increasing the interval between the adjacent storage portions 15. The non-joint portions are made to be scattered.
  • the reliability of sealing is lowered, and the large-area non-joined portion causes leakage of the electrolyte solution 5 or the outside. This may cause the intrusion of water vapor.
  • small areas of non-joined portions are interspersed with a certain large interval, so that leakage of the electrolyte solution 5 and entry of external water vapor can be suppressed.
  • the size and pitch of the accommodating portion 15 to be formed in advance are set so that the non-joined portion has a size and a pitch that do not cause leakage of the electrolyte solution 5 or entry of external water vapor. Thereby, it is possible to prevent the electrolytic solution 5 protruding from the electrode laminate 17 from impairing the sealing reliability of the outer container 14.
  • the electrolytic solution 5 is not interposed at all at the portion where the flexible films 6 overlap each other, but the sealing reliability is not impaired even if the electrolytic solution 5 is interposed.
  • the size and position of the portion where the electrolytic solution 5 is interposed are controlled.
  • the size of each accommodating portion 15, that is, the size of each portion where the electrolytic solution 5 is interposed has a maximum diameter (for example, d1) of 2 mm or less, and its planar shape is circular or similar to a circle
  • the minimum spacing (for example, d2) between the adjacent accommodating portions 15 (portions where the electrolytic solution 5 is interposed) is 1 mm or more.
  • the plurality of accommodating portions 15 are arranged so that the dimension (L1-L2-L3) minus L3), that is, the substantial width of the joint portion is 2 mm (minimum width) or more.
  • the resin layer 6b inside the flexible film 6 does not become too thin. Therefore, there is no electrical short circuit or damage to the flexible film 6 due to alloying and powdering by the chemical reaction of the metal foil 6a. And since it is not necessary to consider the sealing reliability fall by interposition of the electrolyte solution 5, the junction part of the flexible films 6 is made to adjoin to the outer periphery part of the electrode laminated body 17, and the secondary battery 1 of FIG. The planar shape can be reduced, and the energy density and volume efficiency can be improved.
  • the accommodating part 15 located in the part which the flexible films 6 overlap does not need to be formed over the perimeter of the exterior container 14.
  • FIG. 1 In a general manufacturing method of the secondary battery 1, the overlapping flexible films 6 are joined to each other in a portion except for a part of the outer periphery of the outer container 14 containing the electrode laminate 17, and only a part is opened. In this state, the electrolytic solution 5 is injected using the opening portion as the inlet portion 16 (see FIG. 6). Thereafter, the injection port portion 16 is sealed so that the electrolyte solution 5 does not leak.
  • the electrolytic solution 5 is formed in the sealing portion, that is, the joint portion where the flexible films overlap each other. Does not enter, and the sealing reliability is high.
  • the injection port portion 16 is sealed after the electrolytic solution 5 is injected, there is a possibility that the electrolytic solution 5 is present in a portion where the flexible films 6 overlap each other.
  • the electrolytic solution 5 jumps and enters the overlapping portion of the flexible films 6. Therefore, it is very effective to form the accommodating portion 15 as described above in the inlet portion 16 for injecting the electrolytic solution 5 and the portion to be joined after the other portion. . It is not always necessary to form the accommodating portion 15 in other portions.
  • 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.
  • 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 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, and the flexible film 6 is a laminate film in which resin layers 6 b and 6 c are provided on both surfaces of a metal foil 6 a serving as a base material.
  • a metal foil 6a a metal foil having a barrier property for preventing leakage of the electrolytic solution 5 and entry of moisture from the outside can be selected, and aluminum, stainless steel, or the like can be used.
  • a heat-fusible resin layer 6b such as a modified polyolefin is provided.
  • the exterior container 14 is formed by making the heat-fusible resin layers 6 b 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 6c such as a nylon film, a polyethylene terephthalate film, or a polyester film may be provided on the surface of the metal foil 6a opposite to the surface on which the heat-fusible resin layer 6b is formed as the surface of the outer container 14. it can.
  • 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 18) 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 casing 14.
  • the support tab 13 prevents damage to the electrode tabs (current collectors 9 and 11) and improves the reliability of connection between the electrode tabs and the electrode terminals (the positive electrode terminal 7 and the negative electrode terminal 8). And having resistance to the electrolytic solution 5 is desirable.
  • Preferred materials for forming the support tab 13 include aluminum, nickel, copper, stainless steel (SUS), and the like.
  • 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.
  • connection process of the positive terminal 7 and the negative terminal 8 will be described in detail.
  • positive electrode tabs (positive electrode current collectors 9) of a plurality of positive electrodes 2 are closely overlapped on one end of positive electrode terminal 7, and metal piece (support tab) 13 is further stacked thereon. Deploy. These are joined together.
  • joining by ultrasonic welding is often employed. That is, ultrasonic welding is performed by applying vibration while pressing and pressing a horn and an anvil (not shown) to the positive terminal 7 and the support tab 13 sandwiching the plurality of positive tabs.
  • the negative electrode 3 similarly to the positive electrode 2 shown in FIG. 4, an assembly 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, and ultrasonic waves Weld.
  • 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 electrode.
  • the laminated body 17 is covered with the flexible film 6 from above and below its main surface (flat surface). Then, on the outside of the outer peripheral edge of the electrode laminate 17 in plan view, pressure and heat are applied to the portion where the flexible films 6 overlap with each other except for a part, The heat-fusible resins constituting the resin layer 6b are bonded together by heat-sealing.
  • the positive electrode terminal 7 and the negative electrode terminal 8 are fixed to the outer peripheral portion of the flexible film 6 via a sealing material (sealant) 18 provided in advance.
  • a portion where pressure and heat are not applied among portions where the flexible films 6 overlap with each other remains as an opening portion (injection port portion 16) that remains unbonded.
  • the inlet portion 16 is formed on a part of any one of the sides of the outer container 14 excluding the side where the positive electrode terminal 7 is arranged and the side where the negative electrode terminal 8 is arranged. .
  • a part of the side located above the drawing is left as a non-joined opening (injection port portion 16).
  • the accommodating part 15 is formed in the part used as the inlet part 16 of the flexible film 6.
  • FIG. 6 to 11 for the sake of convenience, one flexible film 6 covering the electrode laminate 17 is omitted, and the electrode laminate 17 and the accommodating portion 15 are exposed.
  • the electrolytic solution 5 is injected into the exterior container 14 from the injection port portion 16. Since all sides other than the inlet portion 16 are already sealed, the injected electrolyte 5 does not leak. Moreover, the electrolyte solution 5 does not permeate into a portion where the flexible films 6 overlap each other on the side that is already sealed.
  • the injection port portion 16 to be joined later is indicated by being hatched differently from the portion joined earlier.
  • the infiltrated electrolytic solution 5 is stored in the hollow housing portion 15 formed in advance. Be contained. That is, the infiltrated electrolytic solution 5 does not spread irregularly and is accommodated in the accommodating portion 15.
  • the size of the portion where the electrolytic solution 5 is interposed and the interval between adjacent portions are stored. It depends on the arrangement pattern of the part 15.
  • the size for example, the maximum diameter d1 is 2 mm or less
  • the interval d2 between adjacent accommodating portions for example, 1 mm or more
  • the portion excluding the accommodating portion 15 substantially joined portion.
  • the accommodating portions 15 are regularly arranged in a matrix, but depending on the amount of the electrolytic solution 5 estimated to possibly protrude from the electrode laminate 17, the accommodating portions The number, arrangement, and the like of 15 can be set as appropriate, and need not be a regular matrix. Further, the shape and size of each accommodating portion 15 may not be uniform. However, as described above, it is preferable to satisfy the conditions of the size of each accommodating portion 15 (maximum diameter is 2 mm or less) and the interval between adjacent accommodating portions (1 mm or more).
  • the accommodating part 15 is provided only in the inlet part 16 sealed at the end, However, It is not limited to such a structure.
  • the accommodating part 15 may be formed also in parts other than the injection port part 16 of the outer periphery part of the flexible film 6, and the accommodating part 15 is formed over the perimeter of the outer periphery part of the flexible film 6. It does not matter.
  • the accommodating portion 15 As a method for forming the accommodating portion 15, a method of forming a depression (dimple) by fitting in a mold when the flexible film 6 is formed, or forming a depression by pressing the flexible film 6 formed in advance. Examples thereof include a method and a method of pressing a punch from above and below the flexible film 6 to form a recess.
  • the accommodating part 15 can also be formed in the flexible film 6 by forming an uneven
  • a metal plate such as a stainless steel plate is attached to the surface of the punch or seal bar in contact with the flexible film 6 through an elastic resin, An uneven portion for forming the housing portion can be formed.
  • [Modification of Manufacturing Method of Secondary Battery] 8 to 11 show modifications of the method for manufacturing the secondary battery 1 of the present invention.
  • this modified example as in Patent Document 6, when gas is generated by carrying out preliminary charging after housing the electrode current collector 17 and the electrolytic solution 5 in the outer container 14, a part of the outer container 14 is removed. After notching and letting gas escape to the outside, the notched part is sealed again.
  • the flexible films 6 on either one of the sides excluding the side on which the positive electrode terminal 7 is arranged and the side on which the negative electrode terminal 8 is arranged are mutually connected. Widely form overlapping parts.
  • an opening portion (Note) is formed in a part of the widely formed overlapping portion among the overlapping portions of the flexible films 6.
  • the inlet portion 16) is left, and all other portions are bonded together by heat fusion.
  • the electrolyte solution 5 is inject
  • the flexible film 6 is cut out along an imaginary cutting line 19 passing through a portion 16 b of the injection port portion 16 close to the non-sealed electrode laminate 17.
  • the cutting line 19 is a virtual line and is not actually formed.
  • the accommodating portion 15 described above is previously formed in this portion 16b (see FIGS. 8 to 10). As a result, the risk of impairing the sealing reliability due to the large area of the portion where the electrolytic solution 5 intervenes in the joint between the overlapping flexible films 6 can be reduced.
  • the notch process is not limited to a process of completely cutting the flexible film 6 along the cutting line 19 as shown in FIG. 10, and is a process of merely cutting a part of the flexible film 6. Also good.
  • the size and position of the portion where the electrolytic solution 5 is interposed can be controlled by forming the accommodating portion 15 at a portion which is not joined at the time of making the cut and is joined after the cut. This is effective in ensuring the reliability of sealing.
  • the sides other than the injection port portion 16 are sealed before the electrolyte solution 5 is injected, so that the electrolyte solution 5 is attached to the joint portion between the overlapping flexible films 6. There is no risk of intervening. Further, since the portion 16a to be sealed after the injection of the electrolyte solution 5 and before the degassing operation is located at a position away from the outer peripheral edge portion of the electrode laminate 17, the electrolyte solution protruding from the electrode laminate 17 is overlapped. The possibility of entering between the conductive films 6 is small.
  • the portion 16b that is sealed after the degassing operation and cutting is close to the electrode laminate 17, and the possibility that the electrolytic solution 5 enters between the overlapping flexible films 6 is relatively high. Therefore, even if the electrolytic solution 5 enters the portion 16b, a large-area unsealed portion that impairs the reliability of sealing is not generated, and adjacent non-sealed portions are not too close to each other. Thus, it is very effective to previously form the accommodating portion 15 in this portion and control the position and size of the infiltrated electrolytic solution 5.
  • the electrode stack 17 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 a power storage element.
  • a power storage element in which only one positive electrode 2 and only one negative electrode 3 are overlapped via the separator 4 can also be used.
  • a wound body obtained by winding a single long positive electrode 2 and a single long negative electrode 3 with a separator 4 interposed therebetween can also be used as a power storage element.
  • 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).
  • the present invention has been described with reference to the embodiment.
  • the present invention is not limited to the configuration of the above-described embodiment, and the configuration and details of the present invention are within the scope of the technical idea of the present invention.
  • Various changes that can be understood by those skilled in the art can be made.

Abstract

La présente invention porte sur un dispositif électrochimique qui comprend : un élément de stockage d'électricité (17) dans lequel deux types d'électrodes se chevauchent l'une l'autre avec un séparateur interposé entre ces dernières ; et un récipient externe qui formé de films souples (6) et contient l'élément de stockage d'électricité et une solution d'électrolyte. Le récipient externe est formé par liaison de parties des films souples (6) se chevauchant les uns les autres à l'extérieur de l'élément de stockage d'électricité (17) de telle manière que les films souples (6), qui constituent le contenant externe, recouvrent l'élément de stockage d'électricité (17). Au moins une partie de la partie de chevauchement où les films souples (6) se chevauchent les uns les autres est pourvu de parties de réception (15) dans lesquelles la solution électrolytique est maintenue.
PCT/JP2016/085799 2015-12-09 2016-12-01 Dispositif électrochimique et procédé de sa fabrication WO2017098995A1 (fr)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
JP2020170641A (ja) * 2019-04-03 2020-10-15 積水化学工業株式会社 積層型電池の製造方法
WO2021060412A1 (fr) * 2019-09-25 2021-04-01 積水化学工業株式会社 Élément de stockage d'énergie et procédé de fabrication d'élément de stockage d'énergie
WO2022224385A1 (fr) * 2021-04-21 2022-10-27 京セラ株式会社 Procédé de production d'une cellule électrochimique
US11830672B2 (en) 2016-11-23 2023-11-28 KYOCERA AVX Components Corporation Ultracapacitor for use in a solder reflow process

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JP2001325992A (ja) * 2000-05-15 2001-11-22 Awa Eng Co ラミネートシートを外装ケースとする電池の製造方法
JP2010049913A (ja) * 2008-08-21 2010-03-04 Toyota Motor Corp 密閉型電池の製造方法
WO2012066863A1 (fr) * 2010-11-18 2012-05-24 日産自動車株式会社 Batterie secondaire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001325992A (ja) * 2000-05-15 2001-11-22 Awa Eng Co ラミネートシートを外装ケースとする電池の製造方法
JP2010049913A (ja) * 2008-08-21 2010-03-04 Toyota Motor Corp 密閉型電池の製造方法
WO2012066863A1 (fr) * 2010-11-18 2012-05-24 日産自動車株式会社 Batterie secondaire

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11830672B2 (en) 2016-11-23 2023-11-28 KYOCERA AVX Components Corporation Ultracapacitor for use in a solder reflow process
JP2020170641A (ja) * 2019-04-03 2020-10-15 積水化学工業株式会社 積層型電池の製造方法
WO2021060412A1 (fr) * 2019-09-25 2021-04-01 積水化学工業株式会社 Élément de stockage d'énergie et procédé de fabrication d'élément de stockage d'énergie
JP6876883B1 (ja) * 2019-09-25 2021-05-26 積水化学工業株式会社 蓄電素子及び蓄電素子の製造方法
CN113994502A (zh) * 2019-09-25 2022-01-28 积水化学工业株式会社 蓄电元件以及蓄电元件的制造方法
WO2022224385A1 (fr) * 2021-04-21 2022-10-27 京セラ株式会社 Procédé de production d'une cellule électrochimique

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