WO2018021550A1 - Pack de film de batterie et son procédé de fabrication - Google Patents

Pack de film de batterie et son procédé de fabrication Download PDF

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Publication number
WO2018021550A1
WO2018021550A1 PCT/JP2017/027516 JP2017027516W WO2018021550A1 WO 2018021550 A1 WO2018021550 A1 WO 2018021550A1 JP 2017027516 W JP2017027516 W JP 2017027516W WO 2018021550 A1 WO2018021550 A1 WO 2018021550A1
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Prior art keywords
negative electrode
positive electrode
film
mixture layer
electrode terminal
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PCT/JP2017/027516
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English (en)
Japanese (ja)
Inventor
舞子 松村
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Ｎｅｃエナジーデバイス株式会社
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Priority to JP2018530433A priority Critical patent/JP6888196B2/ja
Publication of WO2018021550A1 publication Critical patent/WO2018021550A1/fr

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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
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0568—Liquid materials characterised by the solutes
    • 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
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/02—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • 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 film-clad battery using a film-clad material as an exterior case and a method for manufacturing the same.
  • the lithium ion secondary battery is a battery that can increase the energy density among chargeable and dischargeable secondary batteries, and is widely used from small electronic devices such as notebook computers and mobile phones to large-sized ones such as electric vehicles.
  • Typical shapes of lithium ion secondary batteries are cylindrical, rectangular, and film exterior types.
  • the film exterior type is selected as a high-energy application because it uses a laminate film, which is a flexible film, as an exterior case, so it has very good heat dissipation compared to others, and it is lightweight and has freedom of shape. Opportunities are increasing.
  • the film-clad battery is inferior in binding force for fixing the main part of the battery by the outer case as compared with the cylindrical battery or the square battery, the influence on the main part of the battery from the outside is great. Therefore, the main part of the battery moves inside the battery due to a large vibration or impact that cannot be ignored, and the battery functions as a short circuit between the positive electrode current collector and the negative electrode current collector inside the battery. This may lead to smoke and fire.
  • Patent Document 1 discloses a secondary battery in which a solidified polymer solution is filled between an inner surface of a battery case and an electrode assembly in the space inside the battery case. This describes that safety can be improved.
  • Patent Document 2 discloses a battery in which at least a part of a bundled positive electrode terminal and negative electrode terminal inside the battery is covered with an insulating material. Thus, it is described that a short circuit at the terminal portion can be prevented.
  • Patent Document 3 discloses a film-clad battery in which a thermoplastic resin is filled integrally with a heat-sealed portion of the film-shaped packaging material between the film-shaped packaging material and the battery element. Thus, it is described that the battery element can be prevented from moving inside the film-like exterior material by impact and vibration to damage the exterior material or damage the terminal.
  • Patent Document 4 discloses a flat battery in which an adhesive resin is filled from the end face of the electrode group into the space of the seal portion of the outer case, and each lead is covered with the adhesive resin. Accordingly, it is described that the movement of the electrode group due to a drop impact or vibration can be prevented, and a flat battery excellent in deformation of the outer case and short-circuit prevention can be provided.
  • the AC balance (Anion-Cation balance) is broken by the filled resin, so that Li is deposited, causing an internal short circuit.
  • the resin to be filled is an ion permeable resin, there is a problem that the performance of high output discharge is deteriorated if the concentration is high.
  • such a high concentration ion permeable resin impedes the delivery of Li ions, and has a problem that Li precipitation occurs due to durability deterioration, and an internal short circuit occurs.
  • the present invention solves the problem that the AC balance is lost when a resin is filled inside the cell, and also when the resin to be filled is ion permeable, the performance of high power discharge is deteriorated and Li precipitation is caused by charge concentration.
  • the problem is to solve this problem.
  • an object of the present invention is to provide a film-clad battery having durability against vibration and impact and having a good AC balance.
  • the present invention has been completed by finding that there is a great correlation in the positional relationship between the barrier portion formed inside the case and the positive electrode, negative electrode, and separator.
  • a separator A positive electrode terminal electrically connected to the positive electrode current collector;
  • a negative electrode terminal electrically connected to the negative electrode current collector;
  • Electrolyte A film exterior battery including a film exterior case, The positive electrode terminal and the negative electrode terminal are drawn in the same direction from one side of the film outer case, The positive electrode and the negative electrode are laminated so that the positive electrode mixture layer and the negative electrode mixture layer face each other with the separator interposed therebetween, The area of the opposing surface of the negative electrode mixture layer is larger than the area of the opposing surface of the positive electrode mixture layer, the outer periphery of the negative electrode mixture layer is located outside the outer periphery of the positive electrode active material layer,
  • the positive electrode terminal and the negative electrode terminal of the film outer case are filled with a solid barrier portion from
  • a method for producing the above film-clad battery A step of covering a main part including a positive electrode, a negative electrode, and a separator with a film exterior material, and forming a film exterior case by sealing at least a side from which the positive electrode terminal and the negative electrode terminal are drawn out of the outer periphery of the film exterior material; , Holding the film outer case with the side from which the positive electrode terminal and the negative electrode terminal are drawn facing downward, and injecting a liquid precursor serving as a barrier portion from the portion where the outer periphery of the film outer case is not sealed And a process of Solidifying the liquid precursor to form a barrier portion; Sealing the unsealed portion of the film outer case, In the step of injecting the liquid precursor, The positive electrode terminal and the negative electrode terminal are drawn from the inner surface of the end of the film outer case on one side to at least the outer peripheral end of the negative electrode mixture layer facing the inner surface of the end, and the outer periphery of the positive electrode
  • a positive electrode terminal and a negative electrode terminal are connected to a main part of a battery having a structure in which a positive electrode and a negative electrode are laminated via a separator, and this main part is a laminate film or the like. It is accommodated in an exterior case made of a film exterior material having flexibility. In that case, each electrode terminal is accommodated so as to lead out, and the terminal lead-out portion around the film exterior material is sealed. In a space including a portion where each electrode terminal is connected to the electrode inside the film exterior case, a specific portion is provided with a barrier portion filled with a resin or a solid electrolyte.
  • This barrier part can be formed as follows. First, the battery main part described above is covered with a film exterior material, and a pre-injection film exterior battery obtained by sealing three sides of both sides adjacent to the side where each electrode terminal is led out is formed. This is held with the side from which the positive terminal and the negative terminal are derived facing downward. Next, with the injection nozzle, a liquid barrier portion precursor (for example, a monomer or a pre-crosslinking polymer electrolyte solution) is applied to the negative electrode coating end and the positive electrode from the gap between the side of the main part of the battery and the inner surface of the battery container from the upper side. Injecting between coating ends, the injected barrier portion precursor is solidified to form a barrier portion, and then an electrolytic solution is injected.
  • a liquid barrier portion precursor for example, a monomer or a pre-crosslinking polymer electrolyte solution
  • the positive electrode terminal inside the film exterior case In a space including a portion where the negative electrode terminal and the negative electrode terminal are respectively connected to the electrode, a specific portion is filled with a resin or a solid electrolyte to form a barrier portion, and by integrating the film outer case and the main part of the battery, It is possible to prevent the movement of the main part of the battery when subjected to vibration / impact and suppress the deviation of the AC balance, and as a result, it is possible to provide a highly reliable film-clad battery.
  • the barrier portion is selected from the group consisting of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-trichloroethylene copolymer, polyacrylonitrile, polymethyl methacrylate, styrene-butadiene rubber (SBR), and carboxymethyl cellulose (CMC). It can be composed of at least one kind.
  • FIG. 1 shows the appearance of an example of a film-clad battery according to an embodiment of the present invention.
  • the film-clad battery according to the embodiment of the present invention can have the same appearance as a general film-clad battery.
  • the main part 20 (indicated by the dotted line of the outer edge) of the battery in which the positive electrode and the negative electrode are arranged via a separator is accommodated.
  • a positive electrode terminal 34 and a negative electrode terminal 44 are connected to the main part 20, and the positive electrode terminal 34 and the negative electrode terminal 44 are drawn from the film outer case 10.
  • the periphery of the film outer case is sealed.
  • FIG. 3 is an enlarged view of the inside of the terminal peripheral portion A (portion surrounded by a broken line) in FIG. 1 (illustrating each component perspectively).
  • the positive electrode 30 is obtained by providing a positive electrode mixture layer 32 made of a positive electrode active material, a conductive additive, a binder and the like on a positive electrode current collector 31.
  • a positive electrode terminal 34 is connected to a portion where the positive electrode mixture layer 32 is not provided and the positive electrode current collector 31 is exposed.
  • the negative electrode 40 has a negative electrode current collector 41 provided with a negative electrode mixture layer 42 made of a negative electrode active material, a conductive additive, a binder, and the like.
  • a negative electrode terminal 44 is connected to a portion where the negative electrode mixture layer 42 is not provided and the negative electrode current collector 41 is exposed.
  • the positive electrode 30 and the negative electrode 40 are laminated via a separator (not shown) to constitute the main part 20 of the battery.
  • the separator has a role of physically separating the positive electrode 30 and the negative electrode 40, has a larger area than the positive electrode and the negative electrode, and faces each other. However, this separator does not cover the exposed portions of the positive electrode current collector and the negative electrode current collector connected to the positive electrode terminal and the negative electrode terminal, respectively (not overlapping in the plane).
  • the negative electrode mixture layer 42 has a role of occluding Li ions from the positive electrode mixture layer 32, the negative electrode mixture layer 42 has a larger area than the positive electrode mixture layer 32. When viewed in a direction perpendicular to the plane, the positive electrode mixture layer 32 is opposed to the negative electrode mixture layer 42 through the separator.
  • the size relationship in the plane of the battery is positive electrode mixture layer 32 ⁇ negative electrode mixture layer 42 ⁇ separator.
  • the coating end of the negative electrode mixture layer is 0.5 to 5 mm from the coating end of the positive electrode mixture layer (D2 and D3 in FIG. 3).
  • the main part 20 of the battery may include a plurality of layers each including a positive electrode, a negative electrode, and a separator, and the positive electrode and the negative electrode may be stacked via the separator.
  • the stacked body has a stack structure as it is. Alternatively, a wound structure may be used.
  • the barrier portion precursor is injected into the terminal peripheral portion A from the container inner lower end D1 of the film outer case to between the negative electrode coating end D2 and the positive electrode coating end D3, and is solidified. It is integrated with the main part and the film outer case.
  • FIG. 2 schematically shows a step of injecting the barrier portion precursor before solidification in the method for manufacturing the film-clad battery 51 according to the embodiment of the present invention.
  • the main part 2 of the battery to which the positive electrode terminal 34 and the negative electrode terminal 44 are connected is accommodated in the film outer case before the liquid barrier portion precursor is injected.
  • the film outer case has one side for injecting the barrier portion precursor and the electrolyte, and the other side is fused.
  • the film outer case can be formed of one or two films.
  • a barrier portion precursor and electrolyte injection portion 60 is opened in a side opposite to the side from which the positive electrode terminal 34 and the negative electrode terminal 44 are led out.
  • the Ferm exterior battery is installed with the injection portion 60 facing upward, and the barrier portion precursor is injected into the injection portion 60 from the injection nozzle B.
  • the barrier part precursor is injected. It is possible to prevent unnecessary adhesion of the barrier portion precursor to the portion 20.
  • the shape including the opening 60 is deformed so as to widen the portion through which the injection nozzle B passes. There is no problem.
  • the injection nozzle can reach between the positive electrode terminal 34 and the negative electrode terminal 44 where the barrier portion precursor is difficult to be injected, and can be reliably filled.
  • the barrier portion (for example, resin or solid electrolyte) is desirably filled as evenly as possible to the region between the negative electrode coating end D2 and the positive electrode coating end D3, and is injected in a liquid state and solidified in a step after the filling. Is desirable.
  • the barrier portion precursor in the injection of the barrier portion precursor, it is only necessary that the barrier portion precursor stays and solidifies at the portion where the barrier portion is formed, and it is preferable that the sides from which the positive electrode terminal 34 and the negative electrode terminal 44 are led are sealed. It is also possible to inject the barrier portion precursor by inserting the injection nozzle B from a portion where the positive electrode terminal 34 and the negative electrode terminal 44 are directed downward and the sealing is not performed on the adjacent side.
  • the barrier portion precursor is injected to a position where it does not reach the coating end D3.
  • the injection amount of the barrier portion precursor can be controlled by a liquid level sensor or the like.
  • the coating edge of the mixture layer (active material layer) applied to the current collector may be peeled off during the manufacturing process, preventing the coating layer (active material layer) from peeling off.
  • an insulating tape such as a resin tape may be attached to the coating end.
  • the barrier portion is filled up to the portion where the insulating tape is attached unless the barrier portion contacts the coating end. Is possible.
  • the positive electrode is fixed to the barrier portion in a larger area, and the fixing strength is increased.
  • a part of the positive electrode current collector and a part of the negative electrode current collector are connected to the positive electrode terminal and the negative electrode terminal, respectively, and the positive electrode conductive protection is connected to each of these connection parts.
  • a plate and a negative electrode protective plate may be further provided.
  • a part of the positive electrode current collector may be connected to be sandwiched between the positive electrode terminal and the positive electrode conductive protection plate, and a part of the negative electrode current collector may be connected to be sandwiched between the negative electrode terminal and the negative electrode conductive protection plate.
  • connection marks and burrs may occur in the bonded portion, and it is common to cover the bonded portion with a resin tape or the like, but in the embodiment of the present invention, the barrier portion (for example, the resin) is filled including the joint, so that the resin tape attached to the joint can be omitted.
  • the barrier portion For example, the resin
  • the viscosity of the barrier portion precursor is 20 cP or less (20 mPa ⁇ s or less).
  • the barrier portion precursor may be solidified by taking appropriate measures such as heating, applying a voltage, and administering a solidification initiator depending on the resin material to be used. This viscosity can be measured in a 25 ° C. environment using a vibration type viscometer (product name: VM-100A) manufactured by SEKONIC.
  • a predetermined amount of electrolytic solution is injected and the injection portion 60 is sealed to complete the film-clad battery.
  • the description has been largely omitted except the step of injecting the barrier portion precursor, techniques and processes generally used for film-clad batteries can be applied as long as the injection of the barrier portion precursor is not hindered.
  • the film-clad battery according to the embodiment of the present invention can have the following configuration, and a material used for a general film-clad battery can be appropriately selected and used.
  • the positive electrode includes a positive electrode active material and, if necessary, a positive electrode mixture layer containing a conductive additive, a binder, and the like on a positive electrode current collector.
  • Li composite oxide capable of occluding and releasing can be used, and two or more of these may be mixed and used.
  • the positive electrode mixture layer may contain a conductive additive or a binder.
  • a conductive assistant conductive materials used for ordinary electrodes such as carbon black, ketjen black, acetylene black, natural graphite, artificial graphite, and carbon fiber can be used.
  • a vinylidene fluoride polymer can be used as the binder.
  • the positive electrode current collector aluminum, stainless steel, or an alloy thereof can be used.
  • the shape include foil, flat plate, and mesh.
  • an aluminum foil can be suitably used.
  • the negative electrode includes a negative electrode mixture layer including a negative electrode active material and, if necessary, a binder, a conductive auxiliary agent, and the like on a current collector.
  • the negative electrode active material a material capable of occluding and releasing lithium, such as lithium metal, carbon material, and Si-based material, can be used.
  • the carbon material include graphite and amorphous carbon that can occlude and release lithium.
  • Si-based material Si, SiO 2 , SiO x (0 ⁇ x ⁇ 2), Si-containing composite material, or the like can be used. A composite containing two or more of these materials may be used.
  • the negative electrode mixture layer may contain a conductive aid and a binder as necessary.
  • a conductive support agent and a binder the thing similar to what can be used for the positive mix layer mentioned above can be used.
  • the negative electrode current collector copper, stainless steel, or an alloy thereof can be used.
  • Electrolytic solution for example, one in which a lithium salt is dissolved in one or two or more non-aqueous solvents can be used.
  • Non-aqueous solvents include cyclic carbonates such as ethylene carbonate (EC), propylene carbonate (PC), vinylene carbonate (VC), butylene carbonate (BC); ethyl methyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), chain carbonates such as dipropyl carbonate (DPC); aliphatic carboxylic acid esters; ⁇ -lactones such as ⁇ -butyrolactone; chain ethers; one of organic solvents such as cyclic ethers A seed, or a mixture of two or more can be used. Lithium salts can be dissolved in these organic solvents.
  • lithium salt dissolved in the nonaqueous solvent is not particularly limited, for example LiPF 6, LiAsF 6, LiAlCl 4 , LiClO 4, LiBF 4, LiSbF 6, LiCF 3 SO 3, LiCF 3 CO 2, Li (CF 3 SO 2 ) 2 , LiN (CF 3 SO 2 ) 2 , and lithium bisoxalatoborate are included. These lithium salts can be used individually by 1 type or in combination of 2 or more types. Moreover, a polymer component may be included as a non-aqueous electrolyte. The concentration of the lithium salt can be set in the range of 0.8 to 1.2 mol / L, and preferably 0.9 to 1.1 mol / L.
  • a resin porous film, a woven fabric, a non-woven fabric, or the like can be mainly used.
  • a resin material constituting the separator for example, a polyolefin resin such as polypropylene or polyethylene, a polyester resin, an acrylic resin, a styrene resin, a polyamide resin, a polyimide resin, or a nylon resin 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 separator may be formed with a layer containing inorganic particles, and examples of the inorganic particles include insulating oxides, nitrides, sulfides, and carbides. Among them, it is preferable to contain TiO 2 or Al 2 O 3 .
  • the film outer case can be formed using a flexible laminate film in which a resin layer is provided on the front and back surfaces of a metal layer serving as a base material.
  • a metal layer having a barrier property such as prevention of leakage of the electrolytic solution or entry of moisture from the outside can be selected, and aluminum, stainless steel, or the like can be used.
  • a heat-fusible resin layer such as a modified polyolefin is provided.
  • a film outer case can be formed by causing the heat-fusible resin layers of the flexible film to face each other and heat-sealing the periphery of the portion that houses the main part (electrode laminate) of the battery.
  • a resin layer such as polyamide or polyester can be provided on the surface (exterior surface) side opposite to the surface on which the heat-fusible resin layer is formed.
  • the planar shape of the outer case is preferably a square or a rectangle.
  • the thickness of an exterior case changes according to the magnitude
  • Example 1 Preparation of positive electrode> Ni, Co and Mn-containing Li composite oxide having a layered crystal structure as a positive electrode active material: 92% by mass, carbon black: 5% by mass as a conductive additive, PVDF (polyvinylidene fluoride): 3% as a binder % was added to NMP (N-methylpyrrolidone) as a solvent and kneaded to prepare a positive electrode slurry.
  • the positive electrode slurry was intermittently applied on both sides of an aluminum foil having a thickness of 15 ⁇ m as a positive electrode current collector, dried, and subjected to a roll press.
  • CMC carboxymethylcellulose
  • carbon black 0.3% by mass as a conductive additive
  • SBR styrene-butadiene rubber
  • the obtained positive electrode and negative electrode were laminated via a separator so that the positive electrode had 21 layers and the negative electrode had 22 layers, and the stacked 21 layers of the positive electrode connection portion and 22 layers of the negative electrode connection portion were respectively connected to the positive electrode terminal and the negative electrode.
  • the main part of the battery was obtained by ultrasonic bonding with the terminal.
  • the positive electrode mixture layer 32, the negative electrode mixture layer 42, and the separator were laminated so that a region of ⁇ 2 mm (a circular region having a radius of 2 mm centered on the center of the plane) overlapped from the center of the plane. That is, the positional relationship between the coating end of the positive electrode mixture layer and the coating end of the negative electrode mixture layer is such that the positive electrode terminal and the negative electrode terminal in the laminated cross section (cross section perpendicular to the plane and along the long side) of the main part of the battery
  • the coating end of the negative electrode mixture layer protrudes within the range of 0.6 to 4.6 mm (corresponding to the distance between D2 and D3 in FIG. 3) from the coating end of the positive electrode mixture layer.
  • the protrusion protruded 3.2 mm.
  • the main part 20 of the battery is covered with two aluminum laminate films so that the positive electrode terminal 34 and the negative electrode terminal 44 of the main part 20 of the battery manufactured as described above can be pulled out from one end of the aluminum laminate film.
  • Three sides of the side from which the terminal 44 was drawn out and the sides on both sides were thermally welded to obtain a pre-injection film-clad battery.
  • the distance from the inner end (lower end inside the container) D1 formed by heat-welding the film exterior material on the side from which the positive electrode terminal 34 and the negative electrode terminal 44 are drawn to the negative electrode coating end D2 is 3.5 mm.
  • the distance between the inner end and the main part of the battery was adjusted to 2 mm.
  • the pre-injection film-covered battery 51 was installed so that the side from which the positive electrode terminal 34 and the negative electrode terminal 44 were drawn was directed downward and the injection part 60 was opened upward.
  • the injection nozzle B was inserted from the injection part 60 of the pre-injection film-clad battery 51. At that time, the injection nozzle B was inserted into the gap between the case inner end of the side and the main part 20 of the battery. Subsequently, a liquid acrylic monomer (a mixture containing ethyl acrylate and an acrylate ester having an oxetane ring) in an amount reaching the position between the negative electrode coating end D2 and the positive electrode coating end D3 is injected, and the lower end inside the case is injected. Injection was performed from D1 to a height of 4.0 mm (see FIG. 3). Thereafter, the acrylic monomer was solidified (cured) by being left in a dry atmosphere for 12 hours or more at 45 ° C.
  • a liquid acrylic monomer a mixture containing ethyl acrylate and an acrylate ester having an oxetane ring
  • Example 1 A film-clad battery was produced in the same manner as in Example 1 except that the amount of acrylic monomer injected was set to an amount that did not reach the negative electrode coating end D2.
  • Example 2 A film-sheathed battery was produced in the same manner as in Example 1 except that the amount of acrylic monomer injected was higher than the positive electrode coating end D3 and the amount was set so as to reach the main part 20 of the battery. .
  • the film-clad battery of the example is superior to the film-clad battery of the comparative example in that the AC balance is not lost and in terms of blocking contact between the positive electrode tab (positive electrode terminal) and the negative electrode. Recognize.
  • the resin filling position is “less than D2,” there is a problem in terms of blocking contact between the positive electrode tab (positive electrode terminal) and the negative electrode. That is, since the laminate (main part) is not fixed in the exterior case, it is considered that the laminate has moved during vibration and an internal short circuit has occurred.
  • Example 2 A film-clad battery was produced in the same procedure as in Example 1 except for the following.
  • the injection nozzle B was inserted from the injection part 60 of the pre-injection film-clad battery 51. At that time, the injection nozzle B was inserted into the gap between the case inner end of the side and the main part 20 of the battery. Subsequently, an amount of the polymer electrolyte-containing solution reaching the position between the negative electrode coating end D2 and the positive electrode coating end D3 was poured, and poured from the lower end D1 inside the case to a height of 4.0 mm.
  • a polymer electrolyte an acrylic polymer containing an ethyl acrylate unit and an acrylate unit having an oxetane ring was used. Thereafter, the polymer electrolyte was crosslinked by leaving it in a dry atmosphere for 12 hours or more at 45 ° C.
  • a vibration test was performed using the produced film-clad battery.
  • the conditions of the vibration test are as follows. The battery was fully charged, (7 Hz ⁇ 200 Hz ⁇ 7 Hz) / 1 time was swept for 15 minutes, and the test was repeated 9 times in 3 directions perpendicular to each other for a total of 9 hours. After the vibration test, the presence or absence of a short circuit due to contact between the positive electrode tab (positive electrode terminal) and the negative electrode was confirmed (no short circuit: ⁇ , with short circuit: x).
  • a charge / discharge cycle test 25 ° C., 1 It charge 1 It discharge, upper limit voltage 4.2 V, lower limit voltage 2.5 V was performed.

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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)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Primary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention porte sur un pack de film de batterie qui comprend : une électrode positive dans laquelle une couche de mélange d'électrodes positives contenant un matériau actif d'électrode positive est formée sur un collecteur d'électrode positive ; une électrode négative dans laquelle une couche de mélange d'électrodes négatives contenant un matériau actif d'électrode négative est formée sur un collecteur d'électrode négative ; un séparateur; une borne d'électrode positive et une borne d'électrode négative ; un électrolyte; et un boitier externe du film. Les bornes sont dirigées vers l'extérieur à partir d'un côté du boîtier extérieur du film dans la même direction; l'électrode positive et l'électrode négative sont stratifiées de telle sorte que la couche de mélange d'électrodes positives et la couche de mélange d'électrodes négatives se font face, le séparateur étant intercalé entre elles; la zone de la surface opposée de la couche de mélanges d'électrodes négatives est plus grande que la zone de la surface opposée de la couche de mélange d'électrodes positives; la périphérie externe de la couche de mélange d'électrodes négatives est positionnée à l'extérieur de la périphérie externe de la couche de matériau actif d'électrode positive; l'espace à partir de la surface interne de bord d'un côté du boîtier externe de film, à partir dudit côté, les bornes étant sorties, à au moins la partie de bord périphérique externe de la couche de mélange d'électrode négative faisant face à la surface interne de bord est remplie d'une partie de barrière solide; et cette partie de barrière n'est pas en contact avec la partie périphérique externe de la couche de mélange d'électrodes positives.
PCT/JP2017/027516 2016-07-29 2017-07-28 Pack de film de batterie et son procédé de fabrication WO2018021550A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112970132A (zh) * 2019-07-09 2021-06-15 宁德新能源科技有限公司 阴极片和具有所述阴极片的电极组件

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JP2002042884A (ja) * 2000-07-19 2002-02-08 Mitsubishi Chemicals Corp 平板積層型電池及び平板積層型電池の製造方法
JP2002260736A (ja) * 2000-12-27 2002-09-13 Mitsubishi Chemicals Corp リチウム二次電池
JP2003109557A (ja) * 2001-09-28 2003-04-11 Mitsubishi Electric Corp 非水電解質電池及びその製造方法
JP2005243841A (ja) * 2004-02-25 2005-09-08 Tdk Corp 電気化学デバイス及び電気化学デバイスの製造方法
JP2012209124A (ja) * 2011-03-29 2012-10-25 Fdk Tottori Co Ltd 電気化学素子及びその製造方法、素子製造用の封止金型
JP2012234670A (ja) * 2011-04-28 2012-11-29 Nec Energy Devices Ltd フィルム外装電池およびその製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002042884A (ja) * 2000-07-19 2002-02-08 Mitsubishi Chemicals Corp 平板積層型電池及び平板積層型電池の製造方法
JP2002260736A (ja) * 2000-12-27 2002-09-13 Mitsubishi Chemicals Corp リチウム二次電池
JP2003109557A (ja) * 2001-09-28 2003-04-11 Mitsubishi Electric Corp 非水電解質電池及びその製造方法
JP2005243841A (ja) * 2004-02-25 2005-09-08 Tdk Corp 電気化学デバイス及び電気化学デバイスの製造方法
JP2012209124A (ja) * 2011-03-29 2012-10-25 Fdk Tottori Co Ltd 電気化学素子及びその製造方法、素子製造用の封止金型
JP2012234670A (ja) * 2011-04-28 2012-11-29 Nec Energy Devices Ltd フィルム外装電池およびその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112970132A (zh) * 2019-07-09 2021-06-15 宁德新能源科技有限公司 阴极片和具有所述阴极片的电极组件

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