WO2021112084A1 - 二次電池 - Google Patents

二次電池 Download PDF

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Publication number
WO2021112084A1
WO2021112084A1 PCT/JP2020/044684 JP2020044684W WO2021112084A1 WO 2021112084 A1 WO2021112084 A1 WO 2021112084A1 JP 2020044684 W JP2020044684 W JP 2020044684W WO 2021112084 A1 WO2021112084 A1 WO 2021112084A1
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WO
WIPO (PCT)
Prior art keywords
exterior body
metal plate
secondary battery
insulating material
metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/044684
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English (en)
French (fr)
Japanese (ja)
Inventor
健太 江口
大塚　正博
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to CN202080083536.8A priority Critical patent/CN114747081B/zh
Priority to EP20897103.6A priority patent/EP4071920A4/en
Priority to JP2021562659A priority patent/JP7338701B2/ja
Publication of WO2021112084A1 publication Critical patent/WO2021112084A1/ja
Priority to US17/831,994 priority patent/US20220311108A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • the present invention relates to a secondary battery.
  • the present invention relates to a secondary battery including an electrode assembly composed of an electrode constituent layer including a positive electrode, a negative electrode and a separator.
  • the secondary battery is a so-called storage battery, it can be repeatedly charged and discharged, and is used for various purposes.
  • secondary batteries are used in mobile devices such as mobile phones, smartphones and notebook computers.
  • secondary batteries are used by being connected to external devices where they are equipped with output terminals.
  • the inventor of the present application noticed that there was a problem to be overcome with the conventional secondary battery, and found that it was necessary to take measures for that purpose. Specifically, the inventor of the present application has found that there are the following problems.
  • the secondary battery includes a positive electrode, a negative electrode, an electrode assembly in which an electrode constituent layer including a separator is laminated between them, and an exterior body that encloses the electrode assembly.
  • the exterior body is provided with an output terminal for connecting to an external device, that is, an external output terminal.
  • the external output terminal often has a rivet type configuration, and is provided by caulking a metal rivet member. Since it is "caulked", the metal rivet portion is deformed, and the sealing portion is achieved by pressing the insulating portion.
  • the metal rivet member 80' is deformed so that the body portion 85' is thickened due to "caulking", and the metal is formed through such deformation.
  • the insulating portion 90'located between the body portion 85'of the rivet member 80'and the exterior body 50' is compressed.
  • the region 95'of the insulating portion 90'existing near the edge of the exterior body 50' is greatly compressed. Therefore, if the compressive force associated with "caulking" becomes excessive, the region 95'of the insulating portion 90'may become extremely thin or cut, and there is a concern that the desired sealing force may not be provided. That is, in such a case, it becomes an undesired terminal as an external output terminal of the secondary battery.
  • a main object of the present invention is to provide a secondary battery provided with a more suitable external output terminal.
  • the inventor of the present application tried to solve the above problem by dealing with it in a new direction, instead of dealing with it as an extension of the conventional technology. As a result, the invention of the secondary battery which achieved the above-mentioned main purpose was reached.
  • a secondary battery including an electrode assembly and an exterior body for accommodating the electrode assembly.
  • the exterior body is provided with a metal plate joined via an insulating material, and a secondary battery in which the metal plate serves as an external output terminal is provided.
  • the secondary battery of the present invention is provided with a more suitable external output terminal.
  • the external output terminal is formed by attaching the metal plate to the exterior body via the insulating material, but it is not "caulked". That is, when the metal plate is attached to the exterior body, a force sufficient to deform the metal plate is not applied to the metal plate. Therefore, in the external output terminal according to the present invention, the possibility that the insulating material becomes extremely thin or breaks is reduced while providing a desired sealing force, and a more suitable secondary battery is provided.
  • FIG. 1 is a cross-sectional view schematically showing the configuration of the electrode assembly (FIG. 1 (A): non-winding plane laminated type, FIG. 1 (B): wound type).
  • FIG. 2 is a schematic cross-sectional view showing a configuration of an external output terminal of a secondary battery according to an embodiment of the present invention (FIG. 2 (A): outer arrangement of a metal plate, FIG. 2 (B): metal plate. Inside placement).
  • FIG. 3 is a schematic cross-sectional view of the secondary battery according to the embodiment for explaining the configuration of the exterior body (FIG. 3 (A): outer arrangement of the metal plate, FIG. 3 (B): metal plate. Inside arrangement).
  • FIG. 3 (A) outer arrangement of the metal plate
  • FIG. 3 (B) metal plate. Inside arrangement).
  • FIG. 4 is a schematic cross-sectional view of a secondary battery according to an embodiment for explaining the configuration of the exterior body.
  • FIG. 5 is a schematic cross-sectional view of a secondary battery according to an embodiment of the present invention (FIG. 5 (A): Installation of an external output terminal on a cup-shaped member of a wound electrode assembly / exterior body, FIG. 5 (B): Installation of an external output terminal on a lid-like member of a wound electrode assembly / exterior body).
  • FIG. 6 is a schematic cross-sectional view for explaining the mode of the external output terminal positioned inside the exterior body.
  • FIG. 7 is a schematic cross-sectional view for explaining a modification mode of the external output terminal positioned inside the exterior body.
  • FIG. 8 is a schematic cross-sectional view for explaining the mode of the external output terminal positioned on the outside with respect to the exterior body.
  • FIG. 9 is a schematic cross-sectional view for explaining a modification mode of the external output terminal positioned on the outside with respect to the exterior body.
  • FIG. 10 is a schematic cross-sectional view for explaining the vent function of the external output terminal.
  • FIG. 11 is a schematic cross-sectional view for explaining the “thin-walled aspect of the exterior body”.
  • FIG. 12 is a schematic cross-sectional view for explaining "a mode of a peculiar insulating material configuration”.
  • FIG. 13 is a schematic cross-sectional view for explaining “a specific thickness aspect of the insulating material”.
  • 14 (A) to 14 (C) are schematic cross-sectional views for explaining arrangement variations of external output terminals.
  • 15 (a) to 15 (d) are schematic perspective views for exemplifying and explaining various types of button-type, coin-type, and square-type secondary batteries.
  • 16 (a) to 16 (d) are schematic perspective views for illustrating various shapes (circular, quadrangular, and rectangular) of the metal plate of the external output terminal.
  • FIG. 17 is a schematic cross-sectional view for explaining that a resin layer to be provided for insulation is additionally provided.
  • FIG. 18 is a schematic cross-sectional view for explaining a modification of the present invention.
  • FIG. 19 is a schematic cross-sectional view showing a configuration of a conventional rivet type output terminal (conventional technique).
  • cross-sectional view described directly or indirectly herein is based on a hypothetical cross-section of a secondary battery cut along the stacking direction of the electrode assembly or electrode constituent layers that make up the secondary battery. ing.
  • the direction of "thickness” as described directly or indirectly herein is based on the stacking direction of the electrode materials that make up the secondary battery.
  • the direction of "thickness” corresponds to the plate thickness direction of such a secondary battery.
  • planar view is based on a sketch of an object viewed from above or below along the direction of such thickness.
  • the vertical direction and the “horizontal direction” used directly or indirectly in the present specification correspond to the vertical direction and the horizontal direction in the figure, respectively. Unless otherwise specified, the same sign or symbol shall indicate the same member or part or the same meaning. In one preferred embodiment, it can be considered that the vertical downward direction (that is, the direction in which gravity acts) corresponds to the "downward direction” and the opposite direction corresponds to the "upward direction”.
  • Secondary battery refers to a battery that can be repeatedly charged and discharged. Therefore, the secondary battery according to the present invention is not excessively bound by its name, and may include, for example, a power storage device.
  • the secondary battery according to the present invention includes an electrode assembly in which electrode constituent layers including a positive electrode, a negative electrode and a separator are laminated.
  • FIG. 1 illustrates the electrode assembly 10.
  • the positive electrode 1 and the negative electrode 2 are stacked with each other via a separator 3 to form an electrode constituent layer 5, and at least one or more of the electrode constituent layers 5 are laminated to form an electrode assembly 10. ing.
  • such an electrode assembly is enclosed in an exterior body together with an electrolyte (for example, a non-aqueous electrolyte).
  • the structure of the electrode assembly is not necessarily limited to the planar laminated structure (see FIG.
  • the electrode unit (electrode constituent layer) including the positive electrode, the negative electrode, and the separator arranged between the positive electrode and the negative electrode. ) May be wound in a roll shape (see FIG. 1B). That is, as shown in FIG. 1A, for example, the electrode assembly 10 may have a structure in which the electrode constituent layers 5 are laminated so as to be stacked on each other. Alternatively, the electrode assembly 10 may have a wound structure in which the electrode constituent layer 5 extending in a strip shape for a relatively long time is wound in a roll shape, for example, as shown in FIG. 1 (B). Further, for example, the electrode assembly may have a so-called stack-and-folding structure in which a positive electrode, a separator and a negative electrode are laminated on a long film and then folded.
  • the positive electrode is composed of at least a positive electrode material layer and a positive electrode current collector.
  • a positive electrode material layer is provided on at least one surface of the positive electrode current collector, and the positive electrode material layer contains a positive electrode active material as an electrode active material.
  • each of the plurality of positive electrodes in the electrode assembly may have positive electrode material layers provided on both sides of the positive electrode current collector, or positive electrode material layers may be provided on only one side of the positive electrode current collector. It may be the one that exists.
  • the negative electrode is composed of at least a negative electrode material layer and a negative electrode current collector.
  • a negative electrode material layer is provided on at least one surface of the negative electrode current collector, and the negative electrode material layer contains a negative electrode active material as an electrode active material.
  • each of the plurality of negative electrodes in the electrode assembly may have negative electrode material layers provided on both sides of the negative electrode current collector, or negative electrode material layers may be provided on only one side of the negative electrode current collector. It may be the one that exists.
  • the electrode active materials contained in the positive electrode and the negative electrode are substances that are directly involved in the transfer of electrons in the secondary battery, and are the main substances of the positive and negative electrodes that are responsible for charge / discharge, that is, the battery reaction. is there. More specifically, ions are brought to the electrolyte due to the "positive electrode active material contained in the positive electrode material layer" and the "negative electrode active material contained in the negative electrode material layer", and such ions are transferred between the positive electrode and the negative electrode. The electrons are transferred and charged / discharged.
  • the positive electrode material layer and the negative electrode material layer may be particularly layers capable of occluding and releasing lithium ions.
  • the secondary battery according to the present invention may be a non-aqueous electrolyte secondary battery in which lithium ions move between the positive electrode and the negative electrode via the non-aqueous electrolyte to charge and discharge the battery.
  • the secondary battery according to the present invention corresponds to a so-called "lithium ion battery", and the positive electrode and the negative electrode have layers capable of occluding and discharging lithium ions.
  • a binder may be contained in the positive electrode material layer for more sufficient contact between particles and shape retention.
  • a conductive auxiliary agent may be contained in the positive electrode material layer in order to facilitate the transfer of electrons that promote the battery reaction.
  • the negative electrode active material of the negative electrode material layer is composed of, for example, granules
  • a binder may be contained for more sufficient contact between the particles and shape retention, and electron transfer that promotes the battery reaction.
  • a conductive auxiliary agent may be contained in the negative electrode material layer in order to facilitate the above.
  • the positive electrode material layer and the negative electrode material layer can also be referred to as a "positive electrode mixture layer" and a "negative electrode mixture layer", respectively, because of the form in which a plurality of components are contained.
  • the positive electrode active material may be a substance that contributes to the occlusion and release of lithium ions.
  • the positive electrode active material may be, for example, a lithium-containing composite oxide.
  • the positive electrode active material may be a lithium transition metal composite oxide containing lithium and at least one transition metal selected from the group consisting of cobalt, nickel, manganese and iron. That is, in the positive electrode material layer of the secondary battery according to the present invention, such a lithium transition metal composite oxide is preferably contained as the positive electrode active material.
  • the positive electrode active material may be lithium cobalt oxide, lithium nickel oxide, lithium manganate, lithium iron phosphate, or a part of the transition metal thereof replaced with another metal.
  • Such a positive electrode active material may be contained as a single species, but may be contained in combination of two or more species.
  • the binder that can be contained in the positive electrode material layer is not particularly limited, but is limited to polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene copolymer and polytetrafluoroethylene. At least one species selected from the group consisting of the above can be mentioned.
  • the conductive auxiliary agent that can be contained in the positive electrode material layer is not particularly limited, but is limited to carbon black such as thermal black, furnace black, channel black, ketjen black and acetylene black, graphite, carbon nanotubes, and vapor phase growth. At least one selected from carbon fibers such as carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives can be mentioned.
  • the thickness dimension of the positive electrode material layer is not particularly limited, but may be 1 ⁇ m or more and 300 ⁇ m or less, for example, 5 ⁇ m or more and 200 ⁇ m or less.
  • the thickness dimension of the positive electrode material layer is the thickness inside the secondary battery, and the average value of the measured values at any 10 points may be adopted.
  • the negative electrode active material may be a substance that contributes to the occlusion and release of lithium ions. From this point of view, the negative electrode active material may be, for example, various carbon materials, oxides, and / or lithium alloys.
  • Examples of various carbon materials for the negative electrode active material include graphite (natural graphite, artificial graphite), hard carbon, soft carbon, and diamond-like carbon.
  • graphite has high electron conductivity and excellent adhesion to a negative electrode current collector.
  • Examples of the oxide of the negative electrode active material include at least one selected from the group consisting of silicon oxide, tin oxide, indium oxide, zinc oxide, lithium oxide and the like.
  • the lithium alloy of the negative electrode active material may be any metal that can be alloyed with lithium, for example, Al, Si, Pb, Sn, In, Bi, Ag, Ba, Ca, Hg, Pd, Pt, Te, Zn, It may be a binary, ternary or higher alloy of a metal such as La and lithium.
  • Such an oxide may be amorphous as its structural form. This is because deterioration due to non-uniformity such as grain boundaries or defects is less likely to occur.
  • the binder that can be contained in the negative electrode material layer is not particularly limited, but is at least one selected from the group consisting of styrene-butadiene rubber, polyacrylic acid, polyvinylidene fluoride, polyimide-based resin, and polyamide-imide-based resin. Can be mentioned.
  • the conductive auxiliary agent that can be contained in the negative electrode material layer is not particularly limited, but is limited to carbon black such as thermal black, furnace black, channel black, ketjen black and acetylene black, graphite, carbon nanotubes, and vapor phase growth. At least one selected from carbon fibers such as carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives can be mentioned.
  • the negative electrode material layer may contain a component derived from a thickener component (for example, carboxylmethyl cellulose) used at the time of manufacturing the battery.
  • the thickness dimension of the negative electrode material layer is not particularly limited, but may be 1 ⁇ m or more and 300 ⁇ m or less, for example, 5 ⁇ m or more and 200 ⁇ m or less.
  • the thickness dimension of the negative electrode material layer is the thickness inside the secondary battery, and the average value of the measured values at any 10 points may be adopted.
  • the positive electrode current collector and the negative electrode current collector used for the positive electrode and the negative electrode are members that contribute to collecting and supplying electrons generated by the electrode active material due to the battery reaction.
  • Such an electrode current collector may be a sheet-shaped metal member. Further, such an electrode current collector may have a perforated or perforated form.
  • the current collector may be a metal leaf, a punching metal, a net, an expanded metal, or the like.
  • the positive electrode current collector used for the positive electrode is preferably one made of a metal foil containing at least one selected from the group consisting of aluminum, stainless steel, nickel and the like, and may be, for example, an aluminum foil.
  • the negative electrode current collector used for the negative electrode is preferably one made of a metal foil containing at least one selected from the group consisting of copper, stainless steel, nickel and the like, and may be, for example, a copper foil.
  • the thickness dimensions of the positive electrode current collector and the negative electrode current collector are not particularly limited, but may be 1 ⁇ m or more and 100 ⁇ m or less, for example, 10 ⁇ m or more and 70 ⁇ m or less.
  • the thickness dimension of the positive electrode current collector and the negative electrode current collector is the thickness inside the secondary battery, and the average value of the measured values at any 10 points may be adopted.
  • the separator used for the positive electrode and the negative electrode is a member provided from the viewpoint of preventing a short circuit due to contact between the positive and negative electrodes and retaining the electrolyte.
  • the separator is a member through which ions pass while preventing electronic contact between the positive electrode and the negative electrode.
  • the separator is a porous or microporous insulating member, which may have a film morphology due to its small thickness.
  • a microporous polyolefin membrane may be used as the separator.
  • the microporous membrane used as the separator may contain, for example, only polyethylene (PE) or polypropylene (PP) as the polyolefin.
  • the separator may be a laminate composed of a "microporous membrane made of PE" and a "microporous membrane made of PP".
  • the surface of the separator may be covered with an inorganic particle coat layer and / or an adhesive layer or the like.
  • the surface of the separator may have adhesiveness.
  • the separator should not be particularly bound by its name, and may be a solid electrolyte, a gel-like electrolyte, and / or an insulating inorganic particle having the same function.
  • the thickness dimension of the separator is not particularly limited, but may be 1 ⁇ m or more and 100 ⁇ m or less, for example, 2 ⁇ m or more and 20 ⁇ m or less.
  • the thickness dimension of the separator is the thickness inside the secondary battery (particularly the thickness between the positive electrode and the negative electrode), and the average value of the measured values at any 10 points may be adopted.
  • an electrode assembly composed of an electrode constituent layer including a positive electrode, a negative electrode and a separator may be enclosed in an outer body together with an electrolyte.
  • the electrolyte can assist in the movement of metal ions released from the electrodes (positive electrode and / or negative electrode).
  • the electrolyte may be an "non-aqueous" electrolyte such as an organic electrolyte and an organic solvent, or it may be a "water-based" electrolyte containing water.
  • the electrolyte is preferably an "non-aqueous" electrolyte containing an organic electrolyte, an organic solvent, and the like. That is, it is preferable that the electrolyte is a non-aqueous electrolyte.
  • the electrolyte there will be metal ions emitted from the electrodes (positive electrode and / or negative electrode), and therefore the electrolyte will assist in the movement of the metal ions in the battery reaction.
  • the electrolyte may be in the form of a liquid or a gel.
  • a non-aqueous electrolyte is an electrolyte containing a solvent and a solute.
  • the specific solvent for the non-aqueous electrolyte may contain at least carbonate.
  • Such carbonates may be cyclic carbonates and / or chain carbonates.
  • the cyclic carbonates include at least one selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC) and vinylene carbonate (VC). be able to.
  • the chain carbonates include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC) and dipropyl carbonate (DPC).
  • non-aqueous electrolyte a combination of cyclic carbonates and chain carbonates may be used as the non-aqueous electrolyte, and for example, a mixture of ethylene carbonate and diethyl carbonate may be used.
  • a specific non-aqueous electrolyte solute for example, a Li salt such as LiPF 6 and / or LiBF 4 may be used.
  • the exterior body of the secondary battery is a member capable of accommodating or wrapping the electrode assembly in which the electrode constituent layers including the positive electrode, the negative electrode and the separator are laminated.
  • the exterior body may be a metal exterior body having a non-laminated structure.
  • the secondary battery of the present invention is characterized by the configuration of its external output terminal. That is, it is characterized in the configuration of the output terminal used for connection with an external device in the secondary battery. Specifically, the exterior body is provided with a metal plate joined via an insulating material, and the metal plate serves as an external output terminal.
  • the external output terminal 60 is composed of at least a metal plate 62 and an insulating material 64.
  • the exterior body 50 is provided with an opening 55, and a metal plate 62 is arranged on the surface of the exterior body located around the opening 55 via an insulating material 64.
  • the metal plate 62 is attached to the exterior body 50 via the insulating material 64, preferably due to the bondability of the insulating material 64. It can be said that the metal plate 62 is joined to the exterior body 50 via the insulating material 64 in the peripheral region of the opening 55 provided in the exterior body 50.
  • a tab extending from the electrode assembly is connected to the metal plate. More specifically, as shown in FIG. 3, a tab 70 extending from the electrode assembly is attached to a metal plate 62 provided in the opening 55. That is, the conductive tab 70 of either the positive electrode or the negative electrode extending from the electrode assembly is connected to the inner surface of the metal plate 62 of the exterior body 50. In particular, when the metal plate 62 is positioned outside the exterior body 50 as shown in FIG. 3A, the tab 70 is attached to the metal plate 62 via the opening 55 of the exterior body 50.
  • the tab 70 may consist of an electrode current collector of the electrode assembly. That is, the tab 70 may be formed of a portion of the electrode current collector in which no electrode material is provided. Alternatively, the tab 70 may be a current collecting lead provided in the electrode assembly (particularly, the electrode). Such current collecting leads are conductive and may have thin-walled and / or long-walled forms, for example made of metal. Such conductive tabs are flexible and may be provided in a flexed and / or bent form to contribute to the venting mechanism described below.
  • the insulating material 64 may be provided along the peripheral edge of the opening 55 on the surface of the exterior body. In order to provide more suitable insulation, the insulating material 64 may be provided so as to extend to a region outside the metal plate 62. That is, for example, as shown in FIGS. 2 (A) and 2 (B), the insulating material 64 may be provided on the exterior body 50 so as to protrude outward from the metal plate 62. Similarly, in order to provide more suitable insulation, the insulating material 64 may be provided more inside than the edge of the opening 55 of the exterior body 50. That is, for example, as shown in FIGS. 2A and 2B, the insulating material 64 extends inward so as to exceed the edge portion 55a forming the opening 55 in the exterior body 50. Often, therefore, a portion of the insulating material 64 may extend over the region of the opening 55.
  • the metal plate 62 may have a shape that follows the exterior body.
  • the metal plate 62 is configured in parallel in the horizontal direction in the drawing so as to follow the shape of the exterior body 50. That is, in a cross-sectional view as shown, the metal plate 62 and the surface of the exterior body 50 on which the metal plate 62 is provided may have an arrangement relationship or form parallel to each other.
  • the insulating material may also be formed in a shape that conforms to the exterior body.
  • the insulating material 64 is configured in parallel in the horizontal direction in the drawing so as to follow the shape of the exterior body 50. That is, in a cross-sectional view as shown, the insulating material 64 and the surface of the exterior body 50 on which the insulating material 64 is provided may have an arrangement relationship or form parallel to each other.
  • the external output terminal in the present invention requires a small space for sealing, and therefore can contribute to the miniaturization of the battery and the improvement of the energy density.
  • the external output terminal in the present invention does not include a so-called "caulking" configuration (hereinafter, such a terminal configuration that does not include caulking is also referred to as a "non-caulking configuration"). That is, when the metal plate is attached to the exterior body via the insulating material, a large force that deforms the metal plate is not applied. Therefore, the possibility that the insulating material becomes extremely thin or breaks while providing a desired sealing force is reduced. That is, in the external output terminal in the present invention, inconvenient events such as impairing the desired insulation are suppressed.
  • the metal plate in the present invention is a non-caulked metal plate. Further, because of such a non-caulked metal plate, for example, the metal plate extends on the same plane in a cross-sectional view. In short, the metal plate of the external output terminal does not have a bent shape as a whole, but has a flat plate shape. As shown in FIGS. 2A and 2B, the cross-sectional view shape of the metal plate 62 forming the external output terminal is, for example, a rectangular shape. Such a metal plate has not been subjected to a history of pressure deformation, and is likely to provide longer-term stability from the viewpoint of material. That is, it tends to be an external output terminal suitable for long-term use of the secondary battery.
  • the material of the metal plate is not particularly limited, and may be at least one selected from the group consisting of, for example, aluminum, nickel, stainless steel (SUS), and copper.
  • the metal plate may have a plurality of layers made of different metal materials.
  • the plan-view shape of the metal plate is not particularly limited, and may be, for example, a circle or a rectangle including a quadrangle.
  • the surface of the metal plate may be appropriately surface-treated.
  • “stainless steel” in this specification refers to stainless steel specified in "JIS G0203 steel terminology", for example, and may be chromium or an alloy steel containing chromium and nickel.
  • the insulating material may extend on the same plane, for example, in a cross-sectional view. That is, the cross-sectional shape of the insulating material at the external output terminal may not be a bent shape, but may be, for example, a rectangular shape. As shown in FIGS. 2A and 2B, the thickness of the insulating material 64 may be substantially constant. It can be said that such an insulating material is an insulating material in which the action of pressure deformation is further reduced when the external output terminal is installed.
  • the material of the insulating material 64 is not particularly limited as long as it exhibits "insulating property" and "bonding property".
  • the insulating material 64 may include a resin material.
  • the insulating material 64 may be made of a thermoplastic resin.
  • the insulating material may be composed of polyethylene and / or a polyolefin such as polypropylene, which is merely a specific example.
  • the insulating material 64 may have a film form. That is, the insulating material 64 may have a film form, that is, a thin form.
  • the insulating material 64 may be provided by using a film-shaped insulating material precursor having a form close to the final shape.
  • the exterior body 50 is preferably a metal exterior body.
  • the metal exterior body as the exterior body 50 may have a two-part configuration of a cup-shaped member 52 and a lid-shaped member 54.
  • the "cup-shaped member” in the present specification is formed by having a side surface portion corresponding to a body portion and a main surface portion (for example, a bottom portion) continuous thereto, and a hollow portion is formed inside. It means a member.
  • the term "lid-like member” means a member provided to cover such a cup-shaped member.
  • the lid-shaped member may be, for example, a single member (typically a flat plate-shaped member) extending in the same plane.
  • the lid-shaped member and the cup-shaped member may be combined so that the outer edge portion of the lid-shaped member and the upper end portion of the side surface portion of the cup-shaped member are aligned with each other.
  • the metal exterior body has a non-laminated structure. That is, preferably, the exterior body does not have a laminated structure as a whole. Therefore, in the present invention, the metal exterior body is not, for example, a laminated member of a metal sheet / fusion layer / protective layer. It can be said that the metal outer body in the present invention is different from the outer body of a soft case type battery corresponding to a pouch made of a so-called laminated film.
  • the metal exterior has a structure composed of a single metal member.
  • the metal exterior may be a single member made of a metal such as stainless steel (SUS) or aluminum.
  • SUS stainless steel
  • the term "single metal member” as used herein means that the exterior body does not have a so-called laminated structure in a broad sense, and in a narrow sense, the exterior body is a member substantially composed of only metal. It means that it is. Therefore, an appropriate surface treatment may be applied to the surface of the metal exterior body as long as the member is substantially composed of only metal. For example, in the cut surface obtained by cutting such a metal exterior body in the thickness direction, a single metal layer can be confirmed except for a portion where surface treatment or the like is performed.
  • the metal exterior can have a relatively thin thickness.
  • the metal exterior body in the present invention may have a thickness dimension of 50 ⁇ m or more and less than 200 ⁇ m, for example, 50 ⁇ m or more and 190 ⁇ m or less, 50 ⁇ m or more and 180 ⁇ m or less, or 50 ⁇ m or more and 170 ⁇ m or less.
  • Such a thin exterior body contributes to miniaturization of the secondary battery and improvement of energy density, but in the present invention, inconvenient events caused by the "thinness" of the exterior body are suppressed. This will be described in detail.
  • the cup-shaped member and the lid-shaped member may be hermetically sealed by joining each other. That is, the cup-shaped member and the lid-shaped member are not crimped, and therefore, the airtight seal by caulking does not have to be performed. As a result, it is easier to obtain a secondary battery that saves space than a secondary battery having an exterior body that is caulked. That is, the non-caulking form of the cup-shaped member and the lid-shaped member preferably contributes to the miniaturization of the secondary battery and the improvement of the energy density.
  • the external output terminal is one of the positive and negative electrodes and the exterior is the other of the positive and negative electrodes.
  • the positive electrode side of the secondary battery is provided only on the metal plate of the external output terminal, while the negative electrode side of the secondary battery can be provided in any region of the exterior body. That is, the external output terminal of the metal plate may be adopted only on the positive electrode side, and the negative electrode side may be externally connected from any place of the metal exterior body. Assuming that the side that outputs using the terminal plate (that is, the metal plate) is the positive electrode, the metal exterior body (that is, the side that forms the metal "can" as a whole) is the negative electrode. Therefore, as a lithium ion battery whose negative electrode area is designed to be larger than that of the positive electrode, the possibility of causing a large short circuit can be reduced even if the electrode comes into contact with the can interior.
  • the present invention can be embodied in various aspects. This will be described below.
  • Such an embodiment is an embodiment in which the external output terminal is positioned inside with respect to the exterior body.
  • the metal plate 62 is positioned inside the exterior body 50.
  • the insulating material 64 is arranged inside the exterior body 50, it can be said that the metal plate 62 is attached to the inside of the exterior body 50 via the insulating material 64.
  • the secondary battery since the metal plate is positioned inside the outer surface level of the exterior body, the secondary battery may have a shape in which the portion of the external output terminal is recessed.
  • the external output terminal When the external output terminal is positioned inside the exterior body, there is no protrusion to the outside of the exterior body compared to the conventional rivet type output terminal, and it is easier to improve the energy density of the battery by that amount. Further, the mode in which the external output terminal is positioned inside the exterior body is suitable when the connection point on the external device side connected to the secondary battery has a convex portion, which contributes to the improvement of the degree of freedom in designing the secondary battery. Can be done.
  • a metal member 67 may be further provided on the outer surface of the metal plate 62. This is because it is more likely that the secondary battery will be easier to connect to an external device.
  • the metal member 67 may be provided directly on the metal plate 62.
  • a tab extending from the electrode assembly may be connected to the metal member 67.
  • the metal member 67 may be thicker than the metal plate 62.
  • the outer surface of the metal member 67 may be substantially at the same level as the outer surface of the exterior body 50.
  • Such an embodiment is an embodiment in which the external output terminal is positioned with respect to the outside of the exterior body.
  • the metal plate 62 is positioned on the outside of the exterior body 50.
  • the insulating material 64 is provided on the outside of the exterior body 50, it can be said that the metal plate 62 is attached to the outside of the exterior body 50 via the insulating material 64.
  • the secondary battery since the metal plate is positioned outside the outer surface level of the exterior body, the secondary battery has a form in which the portion of the external output terminal is raised in a convex shape.
  • the external output terminal When the external output terminal is positioned on the outside of the exterior body, there is no protrusion to the inside of the exterior body as compared with the conventional rivet type output terminal, and the electrode assembly can be provided larger by that amount. That is, it is easy to improve the battery energy density. Further, the mode in which the external output terminal is positioned on the outside of the exterior body is suitable when the connection point on the external device side connected to the secondary battery has a recess, which contributes to the improvement of the degree of freedom in designing the secondary battery. Can be done.
  • a metal member 67 may be further provided on the inner surface of the metal plate 62. This is because it is more likely that the external output terminal will be easier to connect to the internal terminal.
  • the metal member 67 may be provided directly on the metal plate 62.
  • a tab extending from the electrode assembly may be connected to the metal member 67.
  • the metal member 67 may be thicker than the metal plate 62.
  • the inner surface of the metal member 67 may be substantially at the same level as the inner surface of the exterior body 50.
  • the inventor of the present application has made extensive studies from the viewpoint that there is room for improving the safety during use of the secondary battery in which the external output terminal is positioned on the outside. As a result, they have found that the external output terminal is positively used as a vent member, and have obtained a battery having a more suitable vent mechanism (hereinafter, also referred to as "vent function"). Specifically, at the external output terminal located on the outside of the exterior body, the joint portion of the insulating material to the exterior body and / or the metal plate can be peeled off due to the increased internal pressure of the cell of the secondary battery. Good.
  • the metal plate 62 can be opened when the internal pressure of the cell becomes excessively high due to the use of the battery such as charging / discharging (see FIG. 10), and the external output terminal can be used as a degassing mechanism at the time of abnormality. .. That is, in such an embodiment, when the metal plate is joined to the outside of the exterior body via the insulating material, the joint surface of the insulating material is first peeled off when the internal pressure of the cell rises, and the internal pressure can be reduced. ..
  • such a secondary battery has an advantage in that it is not necessary to separately provide a vent as a battery design.
  • the metal plate is not fixed by a member other than the insulating material.
  • the tab 70 for connecting the electrode assembly to the metal plate that is, the conductive tab, preferably one that can follow the opening of the metal plate 62 as shown in FIG.
  • the vent mechanism related to the external output terminal will be described in detail.
  • the force received by the metal plate 62 due to the internal pressure of the cell also increases.
  • the force received by the metal plate 62 is the bonding force between the metal plate 62 and the exterior body 50 (that is, the metal plate via the insulating material 64).
  • the bonding force of the 62 to the exterior body 50) can be exceeded, and at least a part of the metal plate 62 can be detached from the exterior body 50.
  • the metal plate 62 can be displaced so that the lid opens (see FIG. 10).
  • the metal plate 62 By opening the metal plate 62 in this way, excess gas inside the exterior body is released to the outside of the exterior body, and more serious accidents such as an unintended battery explosion can be prevented.
  • the "cell internal pressure” means, in a broad sense, the pressure inside the exterior body of the secondary battery. In a narrow sense, “cell internal pressure” means the internal pressure (particularly the internal pressure when using a battery) of an exterior body provided with an electrode assembly and in an airtight state.
  • the "insulating material” in this embodiment contributes to the venting mechanism as described above, and can be referred to as an insulating material that can be peeled off when the cell internal pressure is abnormal, that is, a peelable insulating material.
  • the tab 70 connected to the metal plate 62 may have "play" so that the metal plate 62 opens more favorably in the vent mechanism. That is, if the length of the tab 70 connected to the metal plate 62 is not sufficient, the existence of the tab itself becomes a resistance to the opening of the metal plate 62, and there is a risk that the metal plate 62 will not open properly in an abnormal situation. ..
  • the length of the tab 70 between the electrode assembly 10 and the metal plate 62 may be relatively long so as not to inconveniently hinder the opening of the metal plate 62 ( In particular, it may be longer than the previous tab length). That is, the tab 15 may have a length that does not exert an excessive tension that hinders the opening of the metal plate 62 between the metal plate 62 and the electrode assembly 10.
  • a tab 70 extending from the electrode assembly 10 is provided on the metal plate 62 with bending.
  • the tab 70 may have a bending shape such that it bends (for example, it has a shape that bends at the end of the tab). You can do it).
  • the tab 70 having such a bending and / or bending form can prevent the opening of the metal plate 62 as a venting mechanism from being inconveniently hindered.
  • the exterior body 50 may be displaced due to the increased internal pressure of the cell so that the metal plate 62 can be opened more preferably. That is, when the cell internal pressure becomes abnormally high, the exterior body 50 may be deformed so as to be distorted or bent, and the metal plate 62 may be easily detached from the exterior body 50. As the exterior body is deformed so as to be distorted or bent in this way, the vent mechanism in which the metal plate 62 is opened becomes more likely to function more preferably.
  • the exterior portion of the exterior body that provides the surface on which the metal plate is arranged may be at least partially displaceable due to the increased internal pressure of the cell. According to the exemplary embodiments shown in FIGS.
  • the exterior portion 56 having the surface on which the metal plate 62 is arranged among the constituent surfaces of the exterior body 50 can be deformed so as to be distorted or bent.
  • the metal plate 62 may be easily detached from the exterior body 50.
  • an opening 55 is provided in the main surface portion 52A of the cup-shaped member 52 of the exterior body 50 and the metal plate 62 is arranged, which is caused by the increased internal pressure of the cell in the main surface portion 52A. It may be displaceable.
  • FIG. 5B when the lid-shaped member 54 of the exterior body 50 is provided with the opening 55 and the metal plate 62 is arranged, the lid-shaped member 54 can be displaced due to the increased internal pressure of the cell. It may be. Since the lid-shaped member 54 forms the "exterior portion 56 that provides the surface on which the metal plate 62 is arranged" by itself, it is easy to provide the lid-shaped member 54 as a displaceable member.
  • Such a mode is a mode in which a part of the exterior body has a thin-walled form. Specifically, among the constituent surfaces of the exterior body, the exterior portion that provides the surface on which the metal plate is arranged has a thin-walled form.
  • the thickness of the exterior portion 56 including the surface on which the metal plate 62 is arranged among the constituent surfaces of the exterior body 50 is smaller than the thickness of the metal plate 62. That is, the thickness of the exterior portion 56 provided with the external output terminal 60 is smaller than the thickness of the metal plate 62.
  • the vent mechanism in which the metal plate 62 opens becomes more suitable for functioning.
  • the exterior portion having the surface on which the metal plate is arranged may have lower rigidity than the metal plate.
  • the metal plate may be relatively stiffer than the exterior portion having the surface on which it is placed. Such a difference in rigidity contributes to the realization of a more suitable vent mechanism.
  • an abnormality such as an excessively high cell internal pressure
  • the metal plate is difficult to deform due to its high rigidity, while the exterior part that constitutes the surface on which the metal plate is placed can be deformed.
  • the joint surface is easily peeled off, and the metal plate 62 is easily opened.
  • the thickness of the exterior portion 56 forming the surface on which the metal plate is arranged may be 170 ⁇ m or less.
  • the thickness of the exterior portion is 170 ⁇ m or less, the exterior body is easily deformed at the time of an abnormality such as an excessively high cell internal pressure, and the metal plate 62 is easily opened as a vent mechanism.
  • the thickness of the exterior portion is larger than 170 ⁇ m (for example, when the thickness is 200 ⁇ m or more), the exterior body cannot be deformed at the time of abnormality, and the intended opening of the metal plate 62 is less likely to occur.
  • the lower limit of the thickness of such a thin exterior portion is not particularly limited, but may be, for example, 50 ⁇ m.
  • the main surface 52A is the thickness of the metal plate 62. May be smaller than.
  • the thickness of the lid-shaped member 54 is larger than the thickness of the metal plate 62. It can be smaller.
  • the lid-like member 54 forms the "exterior portion 56 that provides the surface on which the metal plate 62 is arranged" by itself, it is easy to be provided as a member having a small thickness, and therefore, it is easy to be a member that is easily deformed so as to be distorted or bent. ..
  • the insulating material has a peculiar structure.
  • the insulating material is composed of at least two materials having different melting points from each other.
  • the insulating material may be, for example, a thermoplastic resin, and may have a laminated structure in which a low melting point resin layer having a relatively low melting point and a high melting point resin layer having a relatively high melting point are laminated on each other. ..
  • resin layers having different melting points are provided in the insulating material in this way, not only the manufacturing process of the battery becomes more suitable, but also when the battery is used, it can be more suitable.
  • the metal plate can be bonded to the exterior body at a lower temperature by the low melting point resin layer while ensuring the handling of the insulating material by the high melting point resin layer.
  • the resin layer having a relatively low melting point can be melted due to the rise in the cell temperature. Therefore, when the cell is abnormal, the joint surface of the insulating material is easily peeled off, and the metal plate 62 is more easily opened.
  • the insulating material may have a structure in which two low melting point resin layers are laminated via a high melting point resin layer. That is, as shown in FIG. 12, the insulating material 64 includes a high melting point resin layer 65 having a relatively high melting point and a low melting point resin layer 66 having a relatively low melting point with the high melting point resin layer interposed therebetween. (Ie, for example, the three-layer structure shown in the figure) may have a structure including the above.
  • the joint surface between the metal plate 62 and the insulating material 64 and the joint surface between the exterior body 50 and the insulating material 64 form an interface in which the low melting point resin layer is directly involved. Therefore, in an abnormal situation such as when the cell temperature rises excessively, melting of the low melting point resin layer is likely to be directly brought to the interface, peeling of the joint surface is likely to occur, and the metal plate 62 is more preferably opened. It will be easier.
  • the low melting point resin layer has a relatively lower melting point than the high melting point resin layer.
  • the high melting point resin layer has a relatively higher melting point than the low melting point resin layer.
  • the low melting point resin layer may have a melting point lower than the cell temperature T ° C. at the time of abnormality, and the melting point resin layer has the cell temperature T at the time of abnormality. It may have a melting point higher than ° C.
  • the cell temperature T ° C. at the time of abnormality is, for example, about 150 ° C. to 200 ° C.
  • the low melting point resin layer and the high melting point resin layer may be composed of different molecules (for example, different monomer units).
  • the low melting point resin layer and the high melting point resin layer may be based on the same molecule (for example, the same or similar monomer unit).
  • both the low melting point resin layer and the high melting point resin layer may contain the same olefin as a monomer component.
  • the degree of polymerization and the ratio of the non-crystalline portion between the material of the low melting point resin layer and the material of the high melting point resin layer are different. May be different.
  • the same olefin may be, for example, ethylene or propylene.
  • the material of the resin layer tends to have a relatively high melting point.
  • Such adjustment of the degree of polymerization and the degree of crystallinity may be performed by a conventional method, and can be adjusted by changing, for example, the reaction temperature, pressure and / or catalyst in the polymerization reaction.
  • the homopolymer is not limited to the homopolymer, and a copolymer or terpolymer in which both the materials of the low melting point resin layer and the high melting point resin layer contain the same olefin as a monomer unit may be used.
  • the same olefin as the main monomer may be contained, for example, in an amount of 50 mol% or more (based on 100 mol% of all monomers), and a comonomer (the comonomer may or may not be an olefin).
  • the content of the comonomer itself may be the same or the same between the low melting point resin layer and the high melting point resin layer), so that the material of the resin layer tends to have a relatively low melting point.
  • commercially available resin materials having different melting points from each other can be used as the resin materials of the low melting point resin layer and the high melting point resin layer.
  • the insulating material composed of such resin layers having different melting points may have a film form.
  • the insulating material may consist of a multilayer film in which two low melting point resin layers are laminated via a high melting point resin layer.
  • Such an embodiment is an embodiment in which a surface treatment is applied to a surface to be subjected to bonding with an insulating material.
  • a surface treatment is applied to a surface to be subjected to bonding with an insulating material.
  • the joint surface of the exterior body to be joined to the insulating material and / or the joint surface of the metal plate is the surface-treated surface.
  • the surface 50A to be bonded to the insulating material 64 may be at least a surface-treated surface.
  • the surface treatment may be a treatment for improving the bondability, for example, a treatment for joining the exterior body and the insulating material and / or a treatment for increasing the joining strength between the metal plate and the insulating material. More specifically, the joint surface is subjected to cleaning, polishing and / or chemical treatment with chemicals, physical treatment with plasma and / or ultraviolet rays, primer treatment for imparting a metal compound layer, and plating treatment. You may be. That is, the exterior body joint surface and / or the metal plate joint surface is selected from the group consisting of a cleaning-treated surface, a polishing-treated surface, a chemical-treated surface, a plasma-treated surface, an ultraviolet-treated surface, a primer-treated surface, a plating-treated surface, and the like. It may be at least one type of surface. This makes it easier for the vent mechanism to function as intended.
  • the exterior body joint surface and / or the metal plate joint surface is the primer-treated surface.
  • the insulating material and the exterior body may be bonded to each other via the primer-treated surface, or the insulating material and the metal plate may be bonded to each other via the primer-treated surface.
  • the primer treatment method is merely a specific example, but may include a treatment of applying a metal oxide film such as a chromate treatment.
  • Such an embodiment is an embodiment in which the thickness of the insulating material has a specific thickness form. Specifically, the insulating material has a non-uniform thickness.
  • the insulating material 64 may have, for example, a portion sandwiched between the metal plate 62 and the exterior body 50 having a relatively thin shape. That is, the insulating material 64 may have a form in which the thickness is not constant as a whole, but has a thin portion 64a having a relatively small thickness and a thick portion 64b having a relatively large thickness.
  • the metal plate 62 is formed to sink toward the exterior body 50 side, and the thick portion 64b is present on both sides or one side of the thin portion 64a. It may be.
  • a more suitable external output terminal is likely to be provided in terms of airtight sealing.
  • the insulating material in the present invention may be slightly embossed or bent although it is not crimped.
  • the plan view shape of the secondary battery is circular. That is, the secondary battery is a button type or a coin type in terms of outer shape.
  • the circular shape of the secondary battery in plan view means that the shape of the electrode assembly or the exterior body containing the electrode assembly when the electrode assembly is viewed from above or below along the stacking direction of the positive electrode and the negative electrode is substantially circular. It means that.
  • the "circular shape” here is not limited to a perfect circle (that is, simply a “circle” or a “perfect circle”), but is changed from that to a "round shape” as recognized by those skilled in the art. It also includes shapes that can normally be included in. For example, not only a circle / a perfect circle but also the curvature of the arc may be locally different, and further, a shape derived from a circle / a perfect circle such as an ellipse may be used. In a typical example, such a circular battery in a plan view corresponds to a so-called button type or coin type battery.
  • the exterior body of the secondary battery having a substantially circular shape in a plan view does not have a "caulked” form. That is, the caulking configuration is not included in the terminal region of the external connection terminal and / or the joint region between the cup-shaped member and the lid-shaped member of the exterior body.
  • the caulking configuration increases the volume by that amount, but in the embodiment of the present invention, there is no such volume, so that it tends to be a suitable secondary battery in terms of miniaturization and improvement of energy density.
  • the arrangement of the external output terminals 60 in the exterior body 50 can take various forms. Specifically, in FIG. 14A, the external output terminal 60 is arranged on the upper surface / top surface of the exterior body 50, and in FIG. 14B, the external output terminal 60 is arranged on the side surface of the exterior body 50. In FIG. 14C, the external output terminal 60 is arranged on the lower surface / bottom surface of the exterior body 50.
  • the shape of the exterior body 50 in FIG. 14B is a cylinder, the metal plates 62 are joined with a curvature so as to follow the circular shape of the side surface of the exterior body 50.
  • Such variations in the arrangement of the external output terminals can contribute to improving the degree of freedom in designing the secondary battery.
  • the method for forming the external output terminal is not particularly limited, and any method may be used.
  • a material containing a thermoplastic resin is used as the insulating material
  • an external output terminal is formed by arranging a metal plate around a hole provided in the exterior body via an insulating material and then heat-treating the metal plate. it can. In the heat treatment, the insulating material is once melted, whereby the metal plate can be attached to the exterior body via the insulating material. It is also possible to form an external output terminal by applying a pre-melted insulating material to the exterior body and arranging a metal plate on the coated insulating material.
  • the metal plate and the tab are connected to each other, but they may be connected by, for example, laser welding.
  • the metal block 67 is used (see FIG. 10) and the tab 70 is connected to the metal plate 62 by welding via the metal block 67, the laser welding process can be performed more easily. Further, since the tab 70 is laser-welded via the metal block 67, the penetration can be deepened as compared with the case of direct laser welding to the metal plate 62, and a stronger connection can be easily obtained. Furthermore, it can be expected that the metal block functions as a heat sink during laser welding, and the influence of heat associated with laser welding is less likely to reach the insulating material.
  • the button type / coin type secondary battery was mainly mentioned, but the present invention is not necessarily limited to this.
  • it may be a square secondary battery. That is, as shown in FIGS. 15 (a) to 15 (d), the shape of the secondary battery 100 in a plan view is not limited to a circle, and may have a shape such as a quadrangle or a rectangle.
  • the shape of the external output terminal 60 that is, the shape of the metal plate 62 (particularly the shape in a plan view) is not necessarily limited to a circle, and may have a shape such as a quadrangle or a rectangle (FIGS. 16A to 16A). (D)).
  • the insulating material 64 is provided on the exterior body 50 so as to protrude from the metal plate 62 to the outside (FIGS. 2 (A) and 2 (B)) is mentioned, but the present invention does not necessarily have this. Not limited to.
  • the insulating material 64 may be provided so as to be hidden under the metal plate 62 without protruding outward from the metal plate 62.
  • the insulating material 64 may be provided only substantially the same as or inside the outer edge of the metal plate 62.
  • the structure in which the exterior body is composed of a single metal member has been mainly described, but an additional layer may be partially provided with respect to the single metal member.
  • a resin layer to be provided for insulation may be provided at a portion of the exterior body other than the joint surface with the insulating material. This is because it becomes easier to suppress inconvenient events such as short circuits.
  • the inner side surface 56'of the exterior body portion 56 provided with the opening 55 of the exterior body 50 and the outer surface 56'" of the exterior body portion 56 (particularly, the insulating material 64 is provided.
  • a resin layer (not shown) may be provided on the surface region near the outer peripheral side that is not provided) and / or the end surface 55a forming the exterior body opening. It should be noted that these resin layers are provided partially or locally with respect to the exterior body, and are different from those forming a laminated film as the exterior body.
  • the thickness of the insulating material 64 is relatively large, and is shown to be about the same as the thickness of the metal plate 62.
  • the present invention is not necessarily limited to this.
  • the thickness of the insulating material 64 may be smaller than the thickness of the metal plate 62.
  • the thickness of such an insulating material 64 may be about the same as or smaller than the thickness of the "exterior portion 56 providing the surface on which the metal plate 62 is arranged".
  • the "melting point” in this aspect is mainly in the case of a crystalline resin (the degree of crystallization is 100%). It means the melting point at (including those that are not). It is possible that a non-crystalline resin or a resin with a large proportion of non-crystalline resin does not have a melting point or does not show a clear melting point. In such a case, the "melting point" is used. This aspect may be grasped by reading as "glass transition point".
  • venting mechanism is shown in FIG. 10, the present invention is not necessarily limited to the illustrated form.
  • the tab 70 is attached to the metal plate 62 via the metal member 67, but the tab 70 is directly attached to the metal plate 62 without using the metal member 67. May be good.
  • the secondary battery according to the present invention can be used in various fields where storage is expected.
  • the secondary battery of the present invention is used in the fields of electricity, information, and communication (for example, mobile phones, smartphones, laptop computers and digital cameras, activity meters, arm computers, etc.) in which electrical and electronic devices are used.
  • electrical and electronic devices for example, mobile phones, smartphones, laptop computers and digital cameras, activity meters, arm computers, etc.
  • Electronic paper, wearable devices, etc. electrical / electronic equipment field including small electronic devices such as RFID tags, card-type electronic money, smart watches, etc.
  • home / small industrial applications for example, electric tools, golf Carts, home / nursing / industrial robots), large industrial applications (eg forklifts, elevators, bay port cranes), transportation systems (eg hybrids, electric cars, buses, trains, electric assists) Bicycles, electric motorcycles, etc.), power system applications (for example, various power generation, road conditioners, smart grids, general home-installed power storage systems, etc.), medical applications (medical equipment fields such as earphone hearing aids), pharmaceutical applications It can be used in (fields such as dose management systems), IoT fields, space / deep sea applications (for example, fields such as space probes and submersible research vessels), and the like.
  • fields such as dose management systems
  • IoT fields for example, fields such as space probes and submersible research vessels
  • Electrode assembly 50 Exterior body 50A Surface of exterior body to be joined with insulating material 55 Opening 55a Edge part forming the opening 52 Cup-shaped member 54 Lid-shaped member 56 Exterior part with a surface provided with a metal plate 56'Inner surface of the exterior part with an opening 56''Outer surface of the exterior part with an opening 60 External output terminal 62 Metal plate 62A Insulation material Surface of metal plate to be joined with 64 Insulation material 64a Thin part of insulation material 64b Thick part of insulation material 67 Metal member 70 Tab 100 Secondary battery

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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)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
PCT/JP2020/044684 2019-12-04 2020-12-01 二次電池 Ceased WO2021112084A1 (ja)

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CN202080083536.8A CN114747081B (zh) 2019-12-04 2020-12-01 二次电池
EP20897103.6A EP4071920A4 (en) 2019-12-04 2020-12-01 Secondary battery
JP2021562659A JP7338701B2 (ja) 2019-12-04 2020-12-01 二次電池
US17/831,994 US20220311108A1 (en) 2019-12-04 2022-06-03 Secondary battery

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WO2023050075A1 (zh) * 2021-09-28 2023-04-06 宁德时代新能源科技股份有限公司 电池单体、盖组件、电池、用电装置、方法及设备
JP2024527291A (ja) * 2021-07-29 2024-07-24 チューハイ コスミクス バッテリー カンパニー，リミテッド 電池

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KR20210129998A (ko) * 2020-04-21 2021-10-29 삼성에스디아이 주식회사 이차 전지
KR102927442B1 (ko) * 2020-06-18 2026-02-12 삼성에스디아이 주식회사 이차 전지
KR20220000671A (ko) * 2020-06-26 2022-01-04 삼성에스디아이 주식회사 이차 전지
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CN114747081B (zh) 2025-04-29
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