WO2021161812A1 - 二次電池 - Google Patents

二次電池 Download PDF

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Publication number
WO2021161812A1
WO2021161812A1 PCT/JP2021/003272 JP2021003272W WO2021161812A1 WO 2021161812 A1 WO2021161812 A1 WO 2021161812A1 JP 2021003272 W JP2021003272 W JP 2021003272W WO 2021161812 A1 WO2021161812 A1 WO 2021161812A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery
secondary battery
terminal
positive electrode
negative electrode
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/JP2021/003272
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
泰地 葛本
吉一 堀越
雅之 影山
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
Original Assignee
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 CN202180014137.0A priority Critical patent/CN115104216A/zh
Priority to CN202410165367.2A priority patent/CN117977126A/zh
Priority to EP21753076.5A priority patent/EP4086995A4/en
Priority to JP2022500320A priority patent/JPWO2021161812A1/ja
Publication of WO2021161812A1 publication Critical patent/WO2021161812A1/ja
Priority to US17/884,098 priority patent/US20220384919A1/en
Anticipated expiration legal-status Critical
Priority to JP2024018712A priority patent/JP2024036693A/ja
Ceased legal-status Critical Current

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Classifications

    • 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
    • H01M50/552—Terminals characterised by their shape
    • H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • 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
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
    • 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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/153—Lids or covers characterised by their shape for button or coin 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • 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
    • H01M50/181—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for button or coin 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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

  • This technology is related to secondary batteries.
  • This secondary battery includes an electrolytic solution together with a positive electrode and a negative electrode.
  • the configuration of the secondary battery in order to suppress an increase in the contact resistance between the current collector and the terminal while suppressing a decrease in the space efficiency inside the battery, the current collector is penetrated through the lid of the battery case.
  • the terminal is provided so as to be inserted into the insertion hole provided in the above, and the packing is interposed in a part of the joint portion between the current collector and the terminal (see, for example, Patent Document 1).
  • the thickness of the outer can is partially smaller than the thickness of the electrode body (see, for example, Patent Document 2).
  • This technology was made in view of these problems, and its purpose is to provide a secondary battery that can achieve both an increase in energy density and an improvement in manufacturing stability.
  • the secondary battery of one embodiment of the present technology is provided on a battery element including a positive electrode and a negative electrode, a device member for accommodating the battery element inside, a lid member welded to the device member, and the lid member. It is provided with a welded electrode terminal.
  • the lid member has a recess formed by bending the lid member so as to partially project toward the inside of the instrument member, and the electrode terminal is arranged inside the recess.
  • the battery element is housed inside the instrument member, and the lid member is welded to the instrument member. Further, a recessed portion is formed by bending the lid member so as to partially project toward the inside of the instrument member, and an electrode terminal is arranged inside the recessed portion. Therefore, it is possible to achieve both an increase in energy density and an improvement in manufacturing stability.
  • the effect of the present technology is not necessarily limited to the effect described here, and may be any effect of a series of effects related to the present technology described later.
  • FIG. 2 It is a perspective view which shows the structure of the secondary battery in one Embodiment of this technique. It is sectional drawing which enlarges and shows the structure of the secondary battery shown in FIG. It is a perspective view which shows the structure of the battery element shown in FIG. It is sectional drawing which shows the structure of the electrode terminal shown in FIG. 2 in an enlarged manner. It is a perspective view which shows the structure of the battery can used in the manufacturing process of a secondary battery. It is sectional drawing which shows the structure of the secondary battery of the comparative example. It is sectional drawing which shows the structure of the secondary battery of the modification 2. FIG. It is sectional drawing which shows the structure of the secondary battery of the modification 5. It is sectional drawing which shows the structure of the secondary battery of the modification 6.
  • the battery structure of this secondary battery is not particularly limited.
  • the secondary battery described here is a secondary battery having a flat and columnar three-dimensional shape, and more specifically, a secondary battery having a battery structure called a so-called coin type or button type. ..
  • this secondary battery has a pair of bottoms facing each other and a side wall portion located between the pair of bottoms, and the secondary battery has a height higher than the outer diameter. It's getting smaller.
  • the "outer diameter” is the diameter of each of the pair of bottoms, and the "height" is the distance from one bottom to the other.
  • the charging / discharging principle of the secondary battery is not particularly limited.
  • a secondary battery in which the battery capacity can be obtained by using the storage and release of the electrode reactant will be described.
  • This secondary battery includes an electrolytic solution together with a positive electrode and a negative electrode, and in the secondary battery, in order to prevent an electrode reactant from being unintentionally deposited on the surface of the negative electrode during charging, the negative electrode
  • the charge capacity is larger than the discharge capacity of the positive electrode. That is, the electrochemical capacity per unit area of the negative electrode is set to be larger than the electrochemical capacity per unit area of the positive electrode.
  • the type of electrode reactant is not particularly limited, but specifically, it is a light metal such as an alkali metal and an alkaline earth metal.
  • Alkali metals include lithium, sodium and potassium, and alkaline earth metals include beryllium, magnesium and calcium.
  • a secondary battery whose battery capacity can be obtained by utilizing the storage and release of lithium is a so-called lithium ion secondary battery.
  • lithium ion secondary battery lithium is occluded and released in an ionic state.
  • FIG. 1 shows the perspective configuration of the secondary battery
  • FIG. 2 shows an enlarged cross-sectional configuration of the secondary battery shown in FIG.
  • FIG. 3 shows the perspective configuration of the battery element 20 shown in FIG. 1
  • FIG. 4 shows an enlarged cross-sectional configuration of the electrode terminal 30 shown in FIG.
  • FIG. 2 in order to simplify the illustrated contents, each of the positive electrode 21, the negative electrode 22, the separator 23, the positive electrode lead 51, and the negative electrode lead 52, which will be described later, is shown linearly.
  • the upper direction in FIG. 2 will be described as the upper side of the secondary battery, and the lower direction in FIG. 2 will be described as the lower side of the secondary battery.
  • this secondary battery is a button-type secondary battery, as shown in FIGS. 1 and 2, it has a three-dimensional shape in which the height H is smaller than the outer diameter D, that is, a flat and columnar three-dimensional shape.
  • the three-dimensional shape of the secondary battery is flat and cylindrical.
  • the ratio (D / H) of the outer diameter D to the height H is larger than 1 and preferably 25 or less.
  • the thickness of the insulating tape is also included in the height H.
  • the ring-shaped insulating tape is arranged on the upper surface of the secondary battery in a region excluding the recessed portion 12P described later.
  • the secondary battery includes a battery can 10, a battery element 20, an electrode terminal 30, a gasket 40, a positive electrode lead 51, and a negative electrode lead 52.
  • the battery can 10 is a hollow storage member that houses the battery element 20.
  • the battery can 10 has a flat and columnar three-dimensional shape according to the three-dimensional shape of the secondary battery which is flat and columnar. Therefore, the battery can 10 has a pair of bottom portions M1 and M2 facing each other and a side wall portion M3 located between the bottom portions M1 and M2.
  • the side wall portion M3 is connected to the bottom portion M1 at the upper end portion and is connected to the bottom portion M2 at the lower end portion.
  • the planar shapes of the bottom portions M1 and M2 are circular, and the surface of the side wall portion M3 is a convex curved surface.
  • the battery can 10 includes a vessel portion 11 and a lid portion 12, and the lid portion 12 is welded to the vessel portion 11. As a result, the vessel portion 11 is sealed by the lid portion 12.
  • the device portion 11 is a device member that houses the battery element 20 inside, and is a flat and columnar member in which the upper end portion is open and the lower end portion is closed.
  • the device portion 11 has an opening 11K for accommodating the battery element 20 as described later in a state before being sealed by the lid portion 12 (see FIG. 5).
  • the lid portion 12 is a substantially disk-shaped lid member that seals the vessel portion 11, and is welded to the vessel portion 11.
  • the lid portion 12 is welded to the instrument portion 11 on the side of the battery element 20 facing the non-element space 20S described later. As a result, the opening 11K provided in the vessel 11 is shielded by the lid 12.
  • the lid portion 12 is partially recessed because it is bent so as to partially protrude toward the inside of the vessel portion 11. That is, a part of the lid portion 12 is bent so as to form a step toward the center of the lid portion 12.
  • the lid portion 12 has a recessed portion 12P, and also has an upper surface 12F which is a first outer end surface around the recessed portion 12P.
  • the recessed portion 12P is formed by bending the lid portion 12 so as to partially project toward the inside of the vessel portion 11.
  • the upper surface 12F is an outer end surface (surface) of the lid portion 12 around the recessed portion 12P.
  • the lid portion 12 is bent twice in order to form the recessed portion 12P.
  • the lid portion 12 is formed with a one-step step, so that the lid portion 12 has a recessed portion 12P recessed in one step.
  • the shape of the recessed portion 12P that is, the shape defined by the outer edge of the recessed portion 12P when the secondary battery is viewed from above is not particularly limited.
  • the shape of the recessed portion 12P is circular. Since the inner diameter and depth of the recessed portion 12P are not particularly limited, they can be arbitrarily set.
  • the lid portion 12 has a through hole 12K on the surface of the lid portion 12 (the bottom surface of the recessed portion 12P) inside the recessed portion 12P, more specifically, the recessed portion 12P.
  • the through hole 12K is arranged at a position facing the non-element space 20S.
  • the "position facing the non-element space 20S" means a position overlapping the non-element space 20S.
  • the through hole 12K is a hole used for attaching the electrode terminal 30 to the lid portion 12, and has an inner diameter ID.
  • the relationship between the outer diameter 12OD of the lid portion 12 and the inner diameter 12ID of the recessed portion 12P is not particularly limited.
  • the "outer diameter 12OD of the lid portion 12" is the so-called maximum outer diameter
  • the "inner diameter 12ID of the recessed portion 12P” is the so-called maximum inner diameter.
  • the battery can 10 is a welded can in which two members (the vessel portion 11 and the lid portion 12) are welded to each other.
  • the battery can 10 after welding the lid portion 12 to the vessel portion 11 is a single member as a whole, that is, a member that cannot be separated into two members (the vessel portion 11 and the lid portion 12) after the fact. be.
  • the battery can 10 which is a welded can does not have a portion where the two or more members overlap each other and does not have a portion where the two or more members overlap each other.
  • This "does not have a folded portion” means that a part of the battery can 10 is not processed so as to fold each other.
  • two or more members do not have overlapping portions means that the battery can 10 is physically one member after the completion of the secondary battery, so that the battery can 10 is ex post facto. It means that it cannot be separated into two or more members. That is, the battery can 10 is not in a state in which the two or more members are combined with each other so that the battery can 10 can be separated into two or more members after the fact.
  • the battery can 10 which is a welding can is a can different from the crimp can formed by caulking, and is a so-called crimp press can.
  • the "element space volume” is the volume (effective volume) of the internal space of the battery can 10 that can be used to house the battery element 20.
  • the battery can 10 (instrument portion 11 and lid portion 12) has conductivity.
  • the battery can 10 since the battery can 10 is connected to the negative electrode 22 described later in the battery element 20, it functions as a negative electrode terminal.
  • the secondary battery does not have to have a negative electrode terminal separately from the battery can 10, so that the element space volume does not decrease due to the presence of the negative electrode terminal.
  • the element space volume increases, so that the energy density per unit volume of the secondary battery increases.
  • the battery can 10 (instrument portion 11 and lid portion 12) contains any one or more of conductive materials such as a metal material and an alloy material.
  • the battery can 10 contains any one or more of iron, copper, nickel, stainless steel, iron alloy, copper alloy, nickel alloy, and the like in order to function as a negative electrode terminal.
  • the type of stainless steel is not particularly limited, but specific examples thereof include SUS304 and SUS316.
  • the forming material of the vessel portion 11 and the forming material of the lid portion 12 may be the same as each other or may be different from each other.
  • the battery can 10 (cover portion 12) is insulated from the electrode terminal 30 that functions as the positive electrode terminal via the gasket 40, as will be described later. This is because contact (short circuit) between the battery can 10 (negative electrode terminal) and the electrode terminal 30 (positive electrode terminal) is prevented.
  • the battery element 20 is an element that promotes a charge / discharge reaction, and includes a positive electrode 21, a negative electrode 22, a separator 23, and an electrolytic solution that is a liquid electrolyte. .. However, in each of FIGS. 2 and 3, the illustration of the electrolytic solution is omitted.
  • the battery element 20 has a three-dimensional shape similar to the three-dimensional shape of the battery can 10.
  • a so-called dead space battery
  • the gap between the can 10 and the battery element 20 is less likely to occur, so that the internal space of the battery can 10 is effectively used.
  • the element space volume increases, so that the energy density per unit volume of the secondary battery increases.
  • the battery element 20 has a flat and columnar three-dimensional shape according to the three-dimensional shape of the battery can 10 which is flat and columnar.
  • the battery element 20 has an upper end portion 20T.
  • the upper end portion 20T is an end portion of the battery element 20 located closer to the lid portion 12 than the vessel portion 11, and more specifically, an upper end portion of the battery element 20.
  • the positive electrode 21 and the negative electrode 22 are wound while facing each other. More specifically, the positive electrode 21 and the negative electrode 22 are laminated with each other via the separator 23, and are wound in a state of being laminated with each other via the separator 23. Therefore, the battery element 20 is a wound electrode body including a positive electrode 21 and a negative electrode 22 wound via a separator 23.
  • the number of turns of each of the positive electrode 21, the negative electrode 22, and the separator 23 is not particularly limited and can be set arbitrarily.
  • the battery element 20 has a non-element space 20S inside, and the non-element space 20S is a space communicated with the outside of the battery element 20.
  • the non-element space 20S is a surplus space that does not contribute to the charge / discharge reaction because the positive electrode 21 and the negative electrode 22 which are the constituent elements of the battery element 20 do not exist.
  • the non-element space 20K is the winding center space 20K.
  • the non-element space 20S which is the winding center space 20K, extends in the direction intersecting the winding direction of the positive electrode 21 and the negative electrode 22, that is, in the vertical direction in FIG. 2, and the battery element extends in that direction. It penetrates 20.
  • the height of the positive electrode 21 is smaller than the height of the separator 23. This is because a short circuit between the battery can 10 that functions as the negative electrode terminal and the positive electrode 21 is prevented.
  • the height of the negative electrode 22 is not particularly limited, but is preferably larger than the height of the positive electrode 21. This is because a short circuit between the positive electrode 21 and the negative electrode 22 due to the precipitation of lithium during charging / discharging is prevented.
  • the relationship between the height of the negative electrode 22 and the height of the separator 23 is not particularly limited and can be set arbitrarily.
  • the "height" described here is a dimension in the vertical direction in FIG.
  • the positive electrode 21 includes a positive electrode current collector and a positive electrode active material layer (not shown).
  • the positive electrode active material layer may be provided on both sides of the positive electrode current collector, or may be provided on only one side of the positive electrode current collector.
  • the material for forming the positive electrode current collector is the same as the material for forming the electrode terminal 30 described later. However, the material for forming the positive electrode current collector and the material for forming the electrode terminal 30 may be the same or different from each other.
  • the positive electrode active material layer contains a positive electrode active material that can occlude and release lithium, and the positive electrode active material contains any one or more of lithium-containing compounds such as a lithium-containing transition metal compound. I'm out.
  • the lithium-containing transition metal compound is an oxide, a phosphoric acid compound, a silicic acid compound, a boric acid compound or the like containing lithium and one or more kinds of transition metal elements as constituent elements.
  • the positive electrode active material layer may further contain a positive electrode binder, a positive electrode conductive agent, and the like.
  • the negative electrode 22 includes a negative electrode current collector and a negative electrode active material layer (not shown).
  • the negative electrode active material layer may be provided on both sides of the negative electrode current collector, or may be provided on only one side of the negative electrode current collector.
  • the material for forming the negative electrode current collector is the same as the material for forming the battery can 10 described above. However, the material for forming the negative electrode current collector and the material for forming the battery can 10 may be the same or different from each other.
  • the negative electrode active material layer contains a negative electrode active material that can occlude and release lithium, and the negative electrode active material contains any one or more of carbon materials and metal-based materials.
  • the carbon material is graphite or the like.
  • the metal-based material is a material containing one or more of metal elements and metalloid elements capable of forming an alloy with lithium as constituent elements, and specifically comprises silicon, tin, and the like. It is contained as an element.
  • the metal-based material may be a simple substance, an alloy, a compound, a mixture of two or more kinds thereof, or a material containing two or more kinds of phases thereof.
  • the negative electrode active material layer may further contain a negative electrode binder, a negative electrode conductive agent, and the like.
  • the separator 23 is an insulating porous film interposed between the positive electrode 21 and the negative electrode 22, and allows lithium ions to pass through while preventing a short circuit between the positive electrode 21 and the negative electrode 22.
  • the separator 23 contains any one or more of the polymer compounds such as polyethylene.
  • the electrolytic solution is impregnated in each of the positive electrode 21, the negative electrode 22, and the separator 23, and contains a solvent and an electrolyte salt.
  • the solvent contains any one or more of non-aqueous solvents (organic solvents) such as carbonic acid ester compounds, carboxylic acid ester compounds and lactone compounds.
  • the electrolyte salt contains any one or more of light metal salts such as lithium salt.
  • FIG. 3 also shows the winding body 120 used for manufacturing the battery element 20 in the secondary battery manufacturing process described later.
  • the wound body 120 has the same configuration as the battery element 20 which is the wound electrode body, except that the positive electrode 21, the negative electrode 22, and the separator 23 are not impregnated with the electrolytic solution. ..
  • the electrode terminal 30 is an external connection terminal connected to the electronic device when the secondary battery is mounted on the electronic device, and is provided on the lid portion 12. ..
  • the electrode terminal 30 is connected to the positive electrode 21 (positive electrode current collector) of the battery element 20, it functions as a positive electrode terminal.
  • the secondary battery is connected to the electronic device via the electrode terminal 30 (positive electrode terminal) and the battery can 10 (negative electrode terminal), so that the electronic device uses the secondary battery as a power source. It can be operated by using it.
  • the electrode terminal 30 contains any one or more of conductive materials such as a metal material and an alloy material.
  • the electrode terminal 30 includes any one or more of aluminum, an aluminum alloy, stainless steel, and the like in order to function as a positive electrode terminal.
  • the electrode terminal 30 has a lower end portion 30T.
  • the lower end portion 30T is an end portion of the electrode terminal 30 located closer to the instrument portion 11 than the lid portion 12, and more specifically, a lower end portion of the electrode terminal 30.
  • the electrode terminal 30 is arranged inside the recessed portion 12P provided in the lid portion 12.
  • the electrode terminal 30 has an upper surface 30F which is a second outer end surface exposed from the recessed portion 12P.
  • the upper surface 30F is an outer end surface (surface) of the lid portion 12 exposed from the inside of the recessed portion 12P.
  • the electrode terminal 30 does not protrude from the lid portion 12 in a state of being arranged inside the recessed portion 12P. More specifically, in the protruding direction of the lid portion 12, that is, in the direction in which the lid portion 12 partially protrudes toward the inside of the instrument portion 11 (downward direction), the position of the upper surface 30F of the electrode terminal 30 is the lid portion. It coincides with the position of the upper surface 12F of 12, or is located in the protruding direction (lower side) from the upper surface 12F. This is because when the height H of the secondary battery is constant, the element space volume increases as compared with the case where the electrode terminal 30 protrudes from the lid portion 12.
  • the electrode terminal 30 is also arranged at a position facing the non-element space 20S. That is, since the electrode terminal 30 is located at a position overlapping the non-element space 20S, the electrode terminal 30 is arranged inside the region R overlapping the non-element space 20S.
  • a part of the electrode terminal 30 is located inside the battery can 10, and more specifically, it is located inside the non-element space 20S. Therefore, the lower end portion 30T of the electrode terminal 30 is located inside the battery can 10 than the upper end portion 20T of the battery element 20, that is, is located below the upper end portion 20T.
  • the electrode terminal 30 includes the terminal portions 30A, 30B, and 30C as shown in FIG.
  • the terminal portion 30A is a columnar first terminal portion inserted through the through hole 12K, and has an outer diameter OD (ODA) smaller than the inner diameter ID of the through hole 12K.
  • the terminal portion 30B is a columnar second terminal portion arranged outside the battery can 10, more specifically, inside the recessed portion 12P.
  • the terminal portion 30B is connected to the upper end portion of the terminal portion 30A and has an outer diameter OD (ODB) larger than the inner diameter ID of the through hole 12K.
  • the terminal portion 30C is a columnar third terminal portion arranged inside the battery can 10.
  • the terminal portion 30C is connected to the lower end portion of the terminal portion 30A and has an outer diameter OD (ODC) larger than the inner diameter ID of the through hole 12K.
  • the outer diameters ODB and ODC may be the same or different from each other. Here, the outer diameters ODB and ODC are the same as each other.
  • the electrode terminal 30 has a substantially columnar three-dimensional shape in which the outer diameter OD is reduced in the middle. Since the outer diameter ODB of the terminal portion 30B is larger than the inner diameter ID of the through hole 12K, it is difficult for the terminal portion 30B to pass through the through hole 12K, and the outer diameter ODC of the terminal portion 30C is larger than the inner diameter ID of the through hole 12K. This is because the terminal portion 30C is so large that it is difficult for the terminal portion 30C to pass through the through hole 12K. Further, the electrode terminal 30 is fixed to the battery can 10 by utilizing the pressing force of the terminal portion 30B on the battery can 10 and the pressing force of the terminal portion 30C on the battery can 10. This makes it difficult for the electrode terminal 30 to fall off from the battery can 10.
  • the gasket 40 is an insulating member arranged between the lid portion 12 and the electrode terminal 30, and insulates the electrode terminal 30 from the lid portion 12. As a result, the electrode terminal 30 is fixed to the lid portion 12 via the gasket 40.
  • the gasket 40 contains any one or more of insulating materials such as polypropylene and polyethylene.
  • the installation range of the gasket 40 is not particularly limited.
  • the gasket 40 is arranged along the entire side wall of the electrode terminal 30, it is arranged from the inside of the recessed portion 12P to the inside of the battery can 10.
  • the positive electrode lead 51 is a connection wiring connected to the positive electrode 21 and the electrode terminal 30, and contains the same material as the material for forming the electrode terminal 30.
  • the material for forming the positive electrode lead 51 and the material for forming the electrode terminal 30 may be the same or different from each other.
  • the positive electrode lead 51 is arranged inside the non-element space 20S in order to connect the positive electrode 21 and the electrode terminal 30 to each other.
  • the positive electrode lead 51 one end is connected to the positive electrode 21 (positive electrode current collector) and the other end is connected to the electrode terminal 30. This is because the element space volume is hardly reduced due to the presence of the positive electrode lead 51, so that the element space volume is increased.
  • the positive electrode 21 since the positive electrode active material layer is not provided on the positive electrode current collector at each of the inner end and the outer end of the winding, the positive electrode current collector is exposed. That is, the positive electrode 21 has a foil winding structure in which only the positive electrode current collector is wound at each of the inner end and the outer end.
  • the connection position of the positive electrode lead 51 with respect to the positive electrode 21 is not particularly limited, but specifically, the positive electrode lead 51 is connected to the outer end of the positive electrode 21 (positive electrode current collector).
  • the negative electrode lead 52 is connected to the negative electrode 22 and the battery can 10 (instrument portion 11), and contains the same material as the material for forming the battery can 10.
  • the material for forming the negative electrode lead 52 and the material for forming the battery can 10 may be the same or different from each other.
  • the negative electrode 22 since the negative electrode active material layer is not provided on the negative electrode current collector at each of the inner end and the outer end of the winding, the negative electrode current collector is exposed. That is, the negative electrode 22 has a foil winding structure in which only the negative electrode current collector is wound at each of the inner end and the outer end.
  • the connection position of the negative electrode lead 52 with respect to the negative electrode 22 is not particularly limited, but specifically, the negative electrode lead 52 is connected to the winding inner end (negative electrode current collector) of the negative electrode 22.
  • the secondary battery may further include any one or more of the other components (not shown).
  • the secondary battery is equipped with a safety valve mechanism.
  • This safety valve mechanism disconnects the electrical connection between the battery can 10 and the battery element 20 when the internal pressure of the battery can 10 exceeds a certain level due to an internal short circuit, external heating, or the like.
  • the installation position of the safety valve mechanism is not particularly limited, but the safety valve mechanism is provided in any one of the bottom portions M1 and M2, and preferably is provided in the bottom portion M2 in which the electrode terminal 30 is not provided.
  • the secondary battery is provided with an insulator between the battery can 10 and the battery element 20.
  • This insulator contains any one or more of an insulating film, an insulating sheet, and the like, and prevents a short circuit between the battery can 10 and the battery element 20 (positive electrode 21). Since the installation range of the insulator is not particularly limited, it can be set arbitrarily.
  • the battery can 10 is provided with a liquid injection hole and an opening valve.
  • the liquid injection hole is used for injecting the electrolytic solution into the battery can 10 and then sealed.
  • the opening valve opens when the internal pressure of the battery can 10 reaches a certain level or higher due to an internal short circuit, external heating, or the like, so that the internal pressure is released.
  • the installation positions of the liquid injection hole and the open valve are not particularly limited, but are either one of the bottoms M1 and M2, and the electrode terminal 30 is preferably provided, as in the installation position of the safety valve mechanism described above. There is no bottom M2.
  • FIG. 5 shows a perspective configuration of the battery can 10 used in the manufacturing process of the secondary battery, and corresponds to FIG. However, in FIG. 5, since the lid portion 12 has not been welded to the vessel portion 11, the vessel portion 11 and the lid portion 12 are separated from each other. In the following, FIGS. 1 to 4 already described will be referred to from time to time.
  • the winding body 120 described above is used to manufacture the battery element 20. Further, in order to assemble the battery can 10, the container portion 11 and the lid portion 12 separated from each other are used.
  • the vessel portion 11 is a member in which the bottom portion M2 and the side wall portion M3 are integrated with each other, and has an opening portion 11K as described above.
  • An electrode terminal 30 is attached to the lid portion 12 in advance via a gasket 40. Since the bottom portion M2 and the side wall portion M3 are separated from each other, the instrument portion 11 may be prepared by welding the side wall portion M3 to the bottom portion M2.
  • a secondary battery When manufacturing a secondary battery, first, a slurry in which a positive electrode active material or the like is dispersed or dissolved in a solvent such as an organic solvent is prepared, and then the slurry is applied to a positive electrode current collector to obtain a positive electrode. Form an active material layer. As a result, the positive electrode 21 including the positive electrode current collector and the positive electrode active material layer is produced.
  • a slurry is prepared by the same procedure except that a negative electrode active material or the like is used instead of the positive electrode active material or the like, and then the slurry is applied to the negative electrode current collector to form a negative electrode active material layer. do.
  • the negative electrode 22 including the negative electrode current collector and the negative electrode active material layer is produced.
  • an electrolyte salt is added to the solvent.
  • the electrolyte salt is dispersed or melted in the solvent, so that an electrolytic solution is prepared.
  • the positive electrode 21 and the negative electrode 22 are laminated with each other via the separator 23, and then the positive electrode 21, the negative electrode 22 and the separator 23 are wound to produce a winding body 120 having a winding center space of 20K. ..
  • the winding body 120 is housed from the opening 11K to the inside of the instrument part 11.
  • one end of the negative electrode lead 52 is connected to the winding body 120 (the negative electrode current collector of the negative electrode 22) by using a welding method or the like, and the other end of the negative electrode lead 52 is connected to the instrument portion 11.
  • the welding method is any one or more than one of a laser welding method and a resistance welding method. The details regarding the welding method described here will be the same thereafter.
  • the lid portion 12 to which the electrode terminal 30 is attached via the gasket 40 in advance is placed on the instrument portion 11 so as to shield the opening 11K, and then the lid portion 12 is welded to the instrument portion 11. do.
  • the outer peripheral portion of the lid portion 12 is welded to one end of the vessel portion 11 around the opening 11K.
  • one end of the positive electrode lead 51 is connected to the winding body 120 (the positive electrode current collector of the positive electrode 21) by using a welding method or the like, and the other end of the positive electrode lead 51 is connected to the electrode terminal 30.
  • the battery can 10 is assembled using the vessel portion 11 and the lid portion 12, and the winding body 120 is enclosed inside the battery can 10. Will be done.
  • the liquid injection hole is sealed.
  • the winding center space 20K which is the non-element space 20S
  • the winding body 120 positive electrode 21, negative electrode 22 and separator 23
  • the battery element 20 which is a wound electrode body having a non-element space 20S (winding center space 20K) is produced. Will be done. Therefore, since the battery element 20 is enclosed inside the battery can 10, the secondary battery is completed.
  • the battery element 20 is housed inside the vessel portion 11, and the lid portion 12 is welded to the vessel portion 11. Further, the recessed portion 12P is formed by bending the lid portion 12 so as to partially project toward the inside of the vessel portion 11, and the electrode terminal 30 is arranged inside the recessed portion 12P. Therefore, for the reasons described below, it is possible to achieve both an increase in energy density and an improvement in manufacturing stability.
  • FIG. 6 shows the cross-sectional configuration of the secondary battery of the comparative example, and corresponds to FIG.
  • the secondary battery of this comparative example has a configuration corresponding to the configuration of the secondary battery disclosed in Patent Document 1 (Japanese Unexamined Patent Publication No. 2014-096374) described above.
  • the secondary battery of the comparative example has a battery can 110 (instrument unit 111) instead of the battery can 10 (instrument unit 11 and lid portion 12), the electrode terminal 30 and the gasket 40. And a lid 112), an electrode terminal 130 and a gasket 140, and a new insulator 150 and a current collector 160.
  • the maximum thickness (thickness) of the battery can 110 (instrument 111 and lid 112) is the same as the maximum thickness of the battery can 10 (instrument 11 and lid 12), the battery cans 10, 110 The thickness of each of them is constant. Further, since the dimensions of the secondary battery of the comparative example (outer diameter D and height H) are the same as the dimensions of the secondary battery of the present embodiment (outer diameter D and height H), the outer diameter D and the height H are the same. The height H is constant.
  • the battery can 110 includes a device portion 111 having an opening 111K and a lid portion 112 having a through hole 112K and a recessed portion 112P.
  • the configuration of the instrument unit 111 is the same as that of the instrument unit 11 except that it contains the same material as the material for forming the electrode terminal 30 in order to function as the positive electrode terminal.
  • the lid portion 112 contains the same material as the material for forming the battery can 10 in order to function as a negative electrode terminal, and the recessed portion 112P is formed by partially reducing the thickness of the lid portion 112. It has the same configuration as the lid portion 12, except that the lid portion 12 has a configuration similar to that of the lid portion 12. That is, in the lid portion 112, the recessed portion 112P is formed by partially reducing the thickness of the lid portion 112 without bending the lid portion 112 so as to partially project.
  • the electrode terminal 130 is arranged inside the recessed portion 112P via a gasket 140, and includes the terminal portions 130A, 130B, 130C corresponding to the terminal portions 30A, 30B, 30C.
  • the terminal portion 130A is inserted through the through hole 112K.
  • the terminal portion 130B is arranged inside the recessed portion 112P so as to protrude from the lid portion 112.
  • the terminal portion 130C is arranged inside the battery can 110 (instrument portion 111). However, the outer diameter of the terminal portion 130B is larger than the outer diameter of the terminal portion 130C.
  • the current collector 160 is provided on the back surface of the lid portion 112 (the surface on the side facing the instrument portion 111) via the insulator 150.
  • the battery can 110 (instrument unit 111) that functions as the positive electrode terminal is connected to the battery element 20 (positive electrode 21) via the positive electrode lead 51, and the electrode terminal 130 that functions as the negative electrode terminal is the negative electrode lead. It is connected to the battery element 20 (negative electrode 22) via 52.
  • the thickness of the lid portion 112 is partially thinned in order to form the recessed portion 112P for arranging the electrode terminal 130.
  • the maximum thickness of the battery can 110 is constant, the maximum thickness of the battery can 110 is originally sufficiently thin in order to provide the recessed portion 112P in the lid portion 112. Then, the thickness of the lid portion 112 must be partially significantly reduced. However, in the portion where the thickness is partially thinned, the physical strength is lower than that in the portion where the thickness is not partially thinned, so that the lid portion 112 is easily deformed in response to an external force. It will be easier. As a result, when the lid portion 112 is pressed against the vessel portion 111 when the lid portion 112 is welded to the vessel portion 111, the lid portion 112 is caused by an external force (force that presses the lid portion 112). Since it is easily deformed, it becomes difficult for the lid portion 112 to be welded to the vessel portion 111.
  • the central portion of the lid portion 112 tends to bend so as to approach the instrument portion 111, and the outer peripheral portion of the lid portion 112 tends to bend so as to move away from the instrument portion 111.
  • the lid portion 112 since a gap is likely to be generated between the instrument portion 111 and the lid portion 112, it becomes difficult for the lid portion 112 to be sufficiently welded to the instrument portion 111.
  • a welding defect of the lid portion 112 to the vessel portion 111 is likely to occur, so that the manufacturing yield is likely to decrease.
  • the insulator 150 and the current collector 160 are interposed between the lid portion 112 and the battery element 20.
  • the height H is constant as described above, in order to accommodate the battery element 20 as much as the insulator 150 and the current collector 160 are present inside the battery can 110.
  • the volume of the internal space of the available battery can 110 is reduced.
  • the electrode terminal 130 projects from the lid portion 112
  • the volume of the internal space of the battery can 110 that can be used for accommodating the battery element 20 is reduced, so that the volume of the internal space is reduced. Is reduced more.
  • the element space volume is significantly reduced, so that the heights of the positive electrode 21 and the negative electrode 22 in the battery element 20 are reduced. Therefore, since the facing area between the positive electrode and the negative electrode is reduced, the energy density per unit volume of the secondary battery is reduced.
  • the manufacturing yield tends to decrease due to poor welding, and the energy density per unit volume also decreases due to the decrease in the element space volume. Therefore, the energy density It is difficult to achieve both an increase in production stability and an improvement in manufacturing stability.
  • the thickness of the lid portion 12 is partially thin in order to form the recessed portion 12P for arranging the electrode terminal 30.
  • the lid portion 12 is bent so as to partially protrude.
  • the thickness of the lid portion 12 is maintained at the maximum thickness in the entire lid portion 12.
  • the physical strength of the entire lid portion 12 is maintained, so that the lid portion 12 is less likely to be deformed in response to an external force. Therefore, when the lid portion 12 is welded to the vessel portion 11, even if the lid portion 12 is pressed against the vessel portion 11, the lid portion 12 is less likely to be deformed due to an external force (force for pressing the lid portion 12). Therefore, the lid portion 12 is easily welded to the vessel portion 11.
  • the entire lid portion 12 is less likely to bend in response to an external force, a gap is less likely to be generated between the vessel portion 11 and the outer peripheral portion of the lid portion 12, so that the vessel is less likely to be generated.
  • the lid portion 12 is sufficiently easily welded to the portion 11. In this case, especially in a portion where the lid portion 12 is partially bent, the lid portion 12 is significantly bent even if it receives an external force due to the improvement in the physical resistance of the lid portion 12 to an external force. Since it becomes difficult, the above-mentioned gap is hardly generated. As a result, in the manufacturing process of the secondary battery (when the lid portion 12 is welded to the vessel portion 11), poor welding of the lid portion 12 to the vessel portion 11 is less likely to occur, so that the manufacturing yield is less likely to decrease.
  • the insulator 150 and the current collector 160 are not interposed between the lid portion 12 and the battery element 20.
  • the volume of the internal space of the battery can 10 that can be used to house the battery element 20 increases by the amount that the insulator 150 and the current collector 160 do not exist inside the battery can 10. ..
  • the element space volume increases, so that the heights of the positive electrode 21 and the negative electrode 22 in the battery element 20 increase. Therefore, since the facing area between the positive electrode and the negative electrode increases, the energy density per unit volume of the secondary battery increases.
  • the manufacturing yield is less likely to decrease and the energy density per unit volume increases, so that it is possible to achieve both an increase in energy density and an improvement in manufacturing stability. can.
  • the battery can 10 since the lid portion 12 is welded to the vessel portion 11, the battery can 10 is a welding can (clean press can). Therefore, since the element space volume increases as compared with the crimp can, the energy density per unit volume can be increased also from this viewpoint. Further, as the element space volume increases, the amount of the electrolytic solution that can be stored inside the battery can 10, that is, the amount of the electrolytic solution held by the battery element 20 increases, so that the charge / discharge reaction can be sufficiently performed. It can also proceed stably.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2014-096374
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2015-130317
  • the lid portion 12 is less likely to be deformed according to the external force. .. Therefore, the lid portion 12 is more easily welded to the vessel portion 11, and a higher effect can be obtained.
  • the position of the upper surface 30F of the electrode terminal 30 coincides with the position of the upper surface 12F of the lid portion 12, or if it is located in the protruding direction from the position of the upper surface 12F, the position thereof. Since the element space volume increases as compared with the case where the electrode terminal 30 protrudes from the lid portion 12, a higher effect can be obtained.
  • the battery element 20 has the non-element space 20S inside and the lid portion 12 is welded to the instrument portion 11 on the side facing the non-element space 20S, the energy density per unit volume is further increased. Therefore, a higher effect can be obtained.
  • the non-element space 20S is the winding center space. It will be 20K.
  • the battery element 20 since the winding center space 20K originally possessed by the battery element 20 which is the winding electrode body is used as the non-element space 20S, the battery element 20 separately has the non-element space 20S. You don't have to. Therefore, the battery element 20 having the non-element space 20S is easily and stably realized, and the element space volume is not reduced due to the new formation of the non-element space 20S, so that a higher effect can be obtained. Obtainable.
  • the element space volume does not decrease even if the positive electrode lead 51 is used, so that a higher effect can be obtained. Obtainable.
  • the space required for arranging the positive electrode lead 51 between the battery can 10 and the battery element 20 can be minimized, there is also a gap between the battery can 10 and the battery element 20. Minimal. Therefore, since the element space volume is hardly reduced, a higher effect can be obtained from this viewpoint as well.
  • the electrode terminal 30 includes the terminal portion 30A having a small outer diameter (ODA) and the terminal portions 30B and 30C having a large outer diameter (ODB, ODC), the electrode terminal 30 is less likely to fall off from the battery can 10. Therefore, while the element space volume is guaranteed, the stable charge / discharge operation of the secondary battery is also guaranteed, so that a higher effect can be obtained.
  • ODA small outer diameter
  • ODC large outer diameter
  • the battery can 10 functions as a negative electrode terminal, so that the secondary battery is a negative electrode. It is not necessary to provide a separate terminal. Therefore, since the element space volume does not decrease due to the presence of the negative electrode terminal, a higher effect can be obtained.
  • the gasket 40 is arranged between the battery can 10 (lid portion 12) and the electrode terminal 30, the electrode terminal 30 and the battery can 10 even when the battery can 10 functions as a negative electrode terminal. Short circuit with is prevented. Therefore, even if the battery can 10 is used as the negative electrode terminal, stable charge / discharge operation of the secondary battery is ensured, so that a higher effect can be obtained.
  • the secondary battery is flat and columnar, that is, if the secondary battery is a small secondary battery such as a button type, the energy density per unit volume even in a small secondary battery having a large restriction in terms of size. Is sufficiently increased, a higher effect can be obtained.
  • the positive electrode 21 and the electrode terminal 30 are connected to each other via one positive electrode lead 51.
  • the number of positive electrode leads 51 is not particularly limited, and may be two or more. That is, the positive electrode 21 and the electrode terminal 30 may be connected to each other via two or more positive electrode leads 51.
  • the outer diameter ODB of the terminal portion 30B is outside the terminal portion 30C by expanding the forming range of the recessed portion 12P. It may be larger than the diameter ODC. Even in this case, since the increase in energy density and the improvement in manufacturing stability are compatible with each other, the same effect can be obtained.
  • the exposed area of the electrode terminal 30 increases, so that the secondary battery can be easily connected to the electronic device.
  • the element space volume is hardly reduced.
  • the outer diameter ODB of the terminal portion 30B may be smaller than the outer diameter ODC of the terminal portion 30C. In this case as well, the same effect can be obtained.
  • the electrode terminal 30 includes the terminal portions 30A, 30B, and 30C, and the outer diameter OD of the electrode terminal 30 changes on the way.
  • the three-dimensional shape of the electrode terminal 30 is not particularly limited, it can be arbitrarily changed.
  • the electrode terminal 30 includes only the terminal portions 30A and 30B, does not have to include the terminal portions 30C, and includes only the terminal portions 30A and 30C. , The terminal portion 30B may not be included.
  • the electrode terminal 30 has a substantially uniform outer diameter OD as a whole, the outer diameter OD of the electrode terminal 30 may be substantially constant. Even in these cases, since the increase in energy density and the improvement in manufacturing stability are compatible with each other, the same effect can be obtained.
  • each of the terminal portions 30A, 30B, and 30C has a columnar three-dimensional shape
  • the electrode terminal 30 has a substantially columnar three-dimensional shape as a whole. ..
  • the three-dimensional shapes of the terminal portions 30A, 30B, and 30C are not particularly limited as long as the electrode terminal 30 can function as a positive electrode terminal.
  • each of the terminal portions 30A, 30B, and 30C has another three-dimensional shape such as a polygonal prism
  • the electrode terminal 30 has another three-dimensional shape of substantially polygonal prism as a whole. You may be doing it.
  • the type of the polygonal prism is not particularly limited, but is a triangular prism, a quadrangular prism, a pentagonal prism, or the like.
  • the three-dimensional shape of the terminal portion 30A may be the same as the three-dimensional shape of the terminal portion 30B, or may be different from the three-dimensional shape of the terminal portion 30B.
  • the relationship between the three-dimensional shapes of the terminal portions 30A and 30B described here is the same for the three-dimensional shapes of the terminal portions 30A and 30C, and also for the three-dimensional shapes of the terminal portions 30B and 30C. The same is true.
  • the lid portion 12 since the lid portion 12 is bent twice to form a one-step step on the lid portion 12, the lid portion 12 has a recessed portion 12P recessed in one step.
  • the number of times the lid portion 12 is bent and the number of steps of the recessed portion 12P are not particularly limited.
  • the lid portion 12 since the lid portion 12 is bent four times to form a two-step step on the lid portion 12, the lid portion 12 is formed. It may have a recessed portion 12P recessed in two stages.
  • the recessed portion 12P has a first-stage lower-stage recessed portion 12P1 having a through hole 12K and a second-stage upper-stage recessed portion 12P2.
  • the electrode terminal 30 includes the lower terminal 31 and the upper terminal 32, so that the recess 12P has the lower recess 12P1 and the upper recess 12P2.
  • the lower terminal 31 has a configuration similar to that of the electrode terminal 30 shown in FIGS. 2 and 4, that is, has a substantially cylindrical three-dimensional shape including the terminal portions 30A, 30B, and 30C. ..
  • the upper terminal 32 has a disk-shaped three-dimensional shape, and has an outer diameter larger than the maximum outer diameter of the lower terminal 31.
  • the upper terminal 32 is partially recessed at a portion corresponding to the lower recessed portion 12P1 because it is bent twice toward the lower terminal 31. As a result, since a step is formed in the upper terminal 32, the upper terminal 32 has a recessed portion 32P and a through hole 32K in the recessed portion 32P.
  • the upper terminal 32 is arranged inside the recessed portion 12P (lower recessed portion 12P1 and upper recessed portion 12P2) via the gasket 40 so that the through hole 32K overlaps with the through hole 12K.
  • the lower terminal 31 is connected to the upper terminal 32 because it is arranged inside the recessed portion 12P (lower recessed portion 12P1 and upper recessed portion 12P2) so that the terminal portion 30A is inserted into the through holes 12K and 32K. ing.
  • the terminal portion 30B is arranged inside the recessed portion 32P so that the terminal portion 30B does not protrude from the upper terminal 32.
  • the electrode terminal 30 is partially recessed as a whole.
  • the forming material of the lower terminal 31 and the forming material of the upper terminal 32 may be the same or different from each other.
  • the same effect can be obtained.
  • the electrode terminal 30 is used by using the upper terminal 32 having an outer diameter larger than the maximum outer diameter of the lower terminal 31. Since the exposed area of the battery is increased, the secondary battery can be easily connected to the electronic device as in the case shown in FIG.
  • the electrode terminal 30 has a substantially columnar three-dimensional shape including the terminal portions 30A, 30B, and 30C and the outer diameter OD changes in the middle.
  • the three-dimensional shape of the electrode terminal 30 is not particularly limited as long as it can function as a positive electrode terminal, and therefore, other three-dimensional shapes that do not include the terminal portions 30A, 30B, and 30C may be used.
  • the electrode terminal 30 may have a disk shape.
  • the disk-shaped electrode terminal 30 is arranged inside the recessed portion 12P via a gasket 40, and is connected to the battery element 20 (positive electrode 21) via a positive electrode lead 51.
  • the electrode terminal 30 is separated from the lid portion 12 in the periphery.
  • the gasket 40 is arranged only in a part of the region between the electrode terminal 30 and the lid portion 12, and more specifically, if the gasket 40 is not present, the electrode terminal 30 and the lid portion 12 are arranged. It is arranged only in the area where the 12 can come into contact with each other.
  • the electrode terminal 30 is formed of a clad material containing an aluminum layer and a nickel layer in this order from the side closest to the gasket 40.
  • the aluminum layer and the nickel layer are rolled and joined to each other.
  • the secondary battery includes a battery element 20 which is a wound electrode body, and in the battery element 20, a positive electrode 21 and a negative electrode 22 are wound via a separator 23.
  • the secondary battery uses a battery element 60 which is a laminated electrode body instead of the battery element 20 which is a wound electrode body. You may have it.
  • the battery element 60 includes a positive electrode 61, a negative electrode 62, and a separator 63 corresponding to the positive electrode 21, the negative electrode 22, and the separator 23.
  • the positive electrode 61 and the negative electrode 62 are alternately laminated via the separator 63. Has been done.
  • the battery element 60 is provided with a through hole 60K that penetrates all of the positive electrode 61, the negative electrode 62, and the separator 63 in the stacking direction, the non-element space 60S that the battery element 60 has is a through hole. It is 60K.
  • the battery element 60 which is a laminated electrode body, is formed by laminating a positive electrode 61, a negative electrode 62, and a separator 63, each having a through hole 60K, on each other to prepare a laminated body, and then impregnating the laminated body with an electrolytic solution. , Except for manufacturing the battery element 60, the battery element 20 is manufactured by the same procedure as the manufacturing procedure of the battery element 20 which is a wound electrode body.
  • a through hole 60K is used as the non-element space 60S, but a partial through hole that penetrates the positive electrode 61, the negative electrode 62, and the separator 63 halfway in the stacking direction. May be used as the non-element space 60S by providing the battery element 60 with a partial through hole.
  • the positive electrode lead 51 is physically separated from the positive electrode current collector, it may be separated from the positive electrode current collector, or it may be physically connected to the positive electrode current collector. It may be integrated with the positive electrode current collector. In the latter case, the metal leaf punching process is used in the manufacturing process of the positive electrode 21. Specifically, after forming a positive electrode active material layer on the positive electrode current collector, the positive electrode current collector is punched out so that the positive electrode lead 51 and the positive electrode current collector have a shape integrated with each other. A positive electrode 21 including a positive electrode current collector integrated with the positive electrode lead 51 can be manufactured. In this case, the positive electrode lead 51 becomes a part of the positive electrode current collector. Even in this case, since the increase in energy density and the improvement in manufacturing stability are compatible with each other, the same effect can be obtained.
  • the positive electrode 21 does not have a foil winding structure, so that the positive electrode active material layer is provided on the entire positive electrode current collector. That is, the positive electrode current collector may not be exposed at each of the winding inner end and the winding outer end of the positive electrode 21.
  • the modification 8 described here is also applicable to the negative electrode lead 52 and the negative electrode current collector. That is, the negative electrode lead 52 may be separated from the negative electrode current collector, or may be integrated with the negative electrode current collector. Of course, when the negative electrode lead 52 is integrated with the negative electrode current collector, the negative electrode 22 does not have a foil winding structure, so even if the negative electrode active material layer is provided on the entire negative electrode current collector. good.
  • the electrode terminal 30 is connected to the battery element 20 (positive electrode 21) via the positive electrode lead 51, and the battery element 20 (negative electrode 22) is connected to the battery can 10 via the negative electrode lead 52. .. Therefore, the electrode terminal 30 functions as a positive electrode terminal, and the battery can 10 functions as a negative electrode terminal.
  • the electrode terminal 30 is connected to the battery element 20 (negative electrode 22) via the negative electrode lead 52, and the battery element 20 (positive electrode 21) is connected to the positive electrode lead 51. It may be connected to the battery can 10 via. In this case, the electrode terminal 30 functions as a negative electrode terminal, and the battery can 10 functions as a positive electrode terminal.
  • the electrode terminal 30 includes any one or more of iron, copper, nickel, stainless steel, iron alloy, copper alloy, nickel alloy, and the like in order to function as a negative electrode terminal.
  • the battery can 10 contains any one or more of aluminum, aluminum alloy, stainless steel, and the like in order to function as a positive electrode terminal.
  • the battery structure of the secondary battery is a button type.
  • the battery structure of the secondary battery is not particularly limited.
  • the battery structure of the secondary battery may be a cylindrical type.
  • the secondary battery since the ratio (D / H) of the outer diameter D to the height H is smaller than 1, the secondary battery has a columnar three-dimensional shape.
  • This cylindrical secondary battery has a configuration similar to that of the button type secondary battery, except as described below.
  • the cylindrical secondary battery includes a battery can 10 (instrument portion 11, opening 11K, lid portion 12, through hole 12K and recessed portion 12P), and a battery element 20 ( Battery can 210 (container 211, opening 211K) corresponding to positive electrode 21, negative electrode 22, separator 23 and non-element space 20S (winding center space 20K), electrode terminal 30, gasket 40, positive electrode lead 51 and negative electrode lead 52 , Lid portion 212, through hole 212K and recessed portion 212P), battery element 220 (positive electrode 221, negative electrode 222, separator 223 and non-element space 220S (winding center space 220K)), electrode terminal 230, gasket 240, positive electrode lead 251 And a negative electrode lead 252.
  • Battery can 210 container 211, opening 211K
  • electrode terminal 30 Lid portion 212, through hole 212K and recessed portion 212P
  • battery element 220 positive electrode
  • cylindrical secondary battery is newly provided with a pair of insulating plates 261,262 and a sealant 270.
  • the configuration of the battery can 210 (instrument portion 211 and lid portion 212) includes the battery can 10 (instrument portion 11 and lid portion 11) except that the ratio of the outer diameter to the height H (D / H) is different as described above. It is the same as the configuration of 12). That is, the lid portion 212 is welded to the vessel portion 211 and has a recessed portion 212P. As a result, the electrode terminal 230 is arranged inside the recessed portion 212P via the gasket 240.
  • each of the positive electrode 221 and the negative electrode 222 and the separator 223 is impregnated with an electrolytic solution, and the structure of the electrolytic solution is as described above.
  • the positive electrode lead 251 is connected to the positive electrode 221 not on the side far from the lid portion 212 but on the side close to the lid portion 212, and is also connected to the electrode terminal 230 via the through hole 212K provided in the lid portion 212. ing.
  • the method of routing the positive electrode lead 251 between the positive electrode 221 and the electrode terminal 230 is not particularly limited.
  • the positive electrode lead 251 is bent between the positive electrode 221 and the electrode terminal 230, and more specifically, the positive electrode lead 251 is folded back once or more in the middle between the positive electrode 221 and the electrode terminal 230.
  • FIG. 13 shows a case where the positive electrode lead 251 is folded back only once.
  • the insulating plates 261,262 are arranged so as to sandwich the battery element 220 in the height direction, they face each other via the battery element 220.
  • Each of the insulating plates 261,262 contains any one or more of the insulating materials such as polyimide.
  • the insulating plate 261 has a through hole 261K at a position overlapping a part or the whole of the winding center space 220K.
  • FIG. 13 shows a case where the inner diameter of the through hole 261K is larger than the inner diameter of the winding center space 220K and the through hole 261K overlaps the entire winding center space 220K.
  • the sealant 270 is a member that protects the periphery of the positive electrode lead 251 and is a so-called protective tape.
  • the sealant 270 has a tubular structure that covers the periphery of the positive electrode lead 251 and contains any one or more of insulating polymer compounds such as polypropylene, polyethylene terephthalate, and polyimide. I'm out.
  • the positive electrode lead 251 is insulated from the battery can 210 (lid portion 212) and the battery element 220 (negative electrode 222) via the sealant 270.
  • the coverage range of the positive electrode lead 251 with the sealant 270 is not particularly limited and can be set arbitrarily.
  • the battery element 220 is housed inside the instrument portion 211, and the lid portion 212 is welded to the instrument portion 211. Therefore, since the electrode terminal 230 is arranged inside the recessed portion 212P, both the increase in energy density and the improvement in manufacturing stability are achieved for the same reason as described for the button-type secondary battery described above. be able to.
  • the cylindrical secondary battery has an increased internal volume of the battery can 210 as compared with the button type secondary battery.
  • the element space volume is further increased, so that the volume energy density is further increased. Therefore, since the battery capacity is further increased, the battery capacity characteristics can be further improved.
  • the element space volume increases by the amount that the special mechanism and the element become unnecessary for the same reason as in the case described with respect to the battery can 10 described above. Therefore, also from this viewpoint, the energy density per volume is further increased, so that the battery capacity can be further improved.
  • the electrode terminal 230 when the electrode terminal 230 is arranged inside the recessed portion 212P via the gasket 240, the electrode terminal 230 is placed when the internal pressure of the battery can 210 rises excessively. Since it functions as an open valve for releasing the internal pressure, the safety of the secondary battery can be improved. In this case, in particular, as described above, the electrode terminal 230 functions stably as an open valve even if the battery capacity increases, so that the safety of the secondary battery is ensured.
  • the through hole 212K is shielded by the electrode terminal 230.
  • the battery can 210 is sealed, the battery element 220 is enclosed inside the battery can 210.
  • the lid portion 212 is separated from the instrument portion 211 before the electrode terminal 230 is separated from the lid portion 212, that is, the secondary battery bursts unintentionally. It is preferable that the fixing strength of the electrode terminal 230 with respect to the lid portion 212 is smaller than the welding strength of the lid portion 212 with respect to the vessel portion 211 in order to prevent this from occurring.
  • the factors that increase the internal pressure mentioned above are the generation of gas due to the decomposition reaction of the electrolytic solution during charging and discharging, and the factors that promote the decomposition reaction of the electrolytic solution are the internal short circuit of the secondary battery and the secondary. Such as heating the battery and discharging the secondary battery under high current conditions.
  • the positive electrode lead 251 is folded back once or more between the positive electrode 221 and the electrode terminal 230, a margin regarding the length of the positive electrode lead 251 is generated.
  • the electrode terminal 230 is difficult to be separated from the lid portion 212 due to being unintentionally pulled by the positive electrode lead 251.
  • the electrode terminal 230 can easily function as an open valve.
  • the inner diameter of the through hole 212K, the inner diameter of the recessed portion 212P, and the inner diameter of the winding center space 220K are not particularly limited and can be set arbitrarily.
  • FIG. 13 shows a case where the inner diameter of the recessed portion 212P is larger than the inner diameter of the through hole 212K and the inner diameter of the through hole 212K is larger than the inner diameter of the winding center space 220K.
  • the inner diameter (maximum inner diameter) of the through hole 212K is larger than the inner diameter (maximum inner diameter) of the winding center space 220K. This is because the exposed area of the electrode terminal 230 in the through hole 212K increases. As a result, when the internal pressure of the battery can 210 rises excessively, the electrode terminal 230 is likely to be pushed outward in the through hole 212K according to the internal pressure, so that the electrode terminal 230 can easily function as an open valve. Become. Further, since the connection area of the positive electrode lead 251 to the electrode terminal 230 increases, the electrical connection state between the electrode terminal 230 and the positive electrode lead 251 can be easily secured.
  • the effect based on the internal pressure release function described here with reference to FIG. 13 can be similarly obtained in FIG. That is, even in the case shown in FIG. 9, the electrode terminal 30 is arranged inside the recessed portion 12P via the gasket 40, and the electrode terminal 30 functions as an open valve in response to an excessive increase in internal pressure. , The safety of the secondary battery can be improved.
  • buttons secondary batteries A button-type secondary battery was manufactured by the following procedure.
  • the positive electrode 21 including the positive electrode current collector and the positive electrode active material layer was produced.
  • the ratio is the ratio of the inner diameter 12ID of the recessed portion 12P to the outer diameter 12OD of the lid portion 12.
  • a winding body 120 having a central space of 20K was produced.
  • the winding body 120 was housed from the opening 11K to the inside of the vessel 11.
  • one end of the copper negative electrode lead 52 was laser welded to the battery element 20 (the negative electrode current collector of the negative electrode 22), and the other end of the negative electrode lead 52 was laser welded to the instrument portion 11.
  • the lid portion 12 was placed on the vessel portion 11 so as to shield the opening portion 11K.
  • one end of the aluminum positive electrode lead 51 was laser welded to the battery element 20 (the positive electrode current collector of the positive electrode 21), and the other end of the positive electrode lead 51 was laser welded to the electrode terminal 30.
  • the vessel portion 11 is pressed against the vessel portion 11.
  • the lid portion 12 was laser welded. As a result, since the lid portion 12 was joined to the vessel portion 11, the battery can 10 was assembled, and the winding body 120 was enclosed inside the battery can 10.
  • the liquid injection hole was sealed.
  • the winding body 120 positive electrode 21, negative electrode 22 and separator 23
  • the battery element 20 having the non-element space 20S (winding center space 20K) was produced. Therefore, since the battery element 20 is enclosed inside the battery can 10, the secondary battery is assembled.
  • 0.1C is a current value that can completely discharge the battery capacity (theoretical capacity) in 10 hours
  • 0.05C is a current value that can completely discharge the battery capacity in 20 hours.
  • An aluminum battery can 110 (instrument part 111 and lid part 112) was prepared.
  • the thickness (mm) of the lid portion 112 was changed.
  • the minimum thickness of the lid portion 112 that is, the thickness of the portion where the lid portion 112 is partially thinned to form the recessed portion 112P, is 1 / of the thickness of the lid portion 112 shown in Table 1. It was set to 3. In this recessed portion 112P, since the lid portion 112 is not bent so as to partially project toward the inside of the vessel portion 111, Table 1 does not show the recessed diameter (mm) with respect to the recessed portion 112P.
  • the element space volume (mm 3 ) was logically (mathematical) calculated based on each dimension of the secondary battery including the thickness of the lid portion 12.
  • the influence of the volume of the non-element space 20S (winding center space 20K) on the element space volume is not considered. That is, for convenience, the volume of the non-element space 20S is also included in the element space volume.
  • the "non-defective number" is the number of secondary batteries in which the lid portion 12 is sufficiently joined to the vessel portion 11.
  • the capacity characteristics (element space volume) and manufacturing stability (non-defective rate) of the secondary battery of the comparative example were also evaluated in the same manner.
  • the recessed portion 112P is formed by partially reducing the thickness of the lid portion 112 (Experimental Examples 1-8 to 1-14), a sufficient non-defective rate cannot be obtained. rice field. In this case, in particular, as the thickness of the lid portion 112 became thinner, the non-defective rate gradually decreased.
  • the battery element 20 is housed inside the vessel 11, the lid 12 is welded to the vessel 11, and the lid 12 is the vessel 11.
  • the recessed portion 12P is formed by bending so as to partially protrude toward the inside, and the electrode terminal 30 is arranged inside the recessed portion 12P, the element space volume is increased while the non-defective product rate is guaranteed. Increased. Therefore, it became possible to stably manufacture the secondary battery according to the guarantee of the non-defective product rate, and the energy density per unit volume of the secondary battery increased according to the increase in the element space volume. We were able to achieve both improved stability.
  • liquid electrolyte electrolyte solution
  • gel-like electrolyte electrolyte layer
  • solid electrolyte solid electrolyte
  • the electrode reactant is not particularly limited. Specifically, as described above, the electrode reactant may be another alkali metal such as sodium and potassium, or an alkaline earth metal such as beryllium, magnesium and calcium. In addition, the electrode reactant may be another light metal such as aluminum.

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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)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
PCT/JP2021/003272 2020-02-12 2021-01-29 二次電池 Ceased WO2021161812A1 (ja)

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CN202180014137.0A CN115104216A (zh) 2020-02-12 2021-01-29 二次电池
CN202410165367.2A CN117977126A (zh) 2020-02-12 2021-01-29 二次电池
EP21753076.5A EP4086995A4 (en) 2020-02-12 2021-01-29 SECONDARY BATTERY
JP2022500320A JPWO2021161812A1 (https=) 2020-02-12 2021-01-29
US17/884,098 US20220384919A1 (en) 2020-02-12 2022-08-09 Secondary battery
JP2024018712A JP2024036693A (ja) 2020-02-12 2024-02-09 二次電池

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113764790A (zh) * 2021-10-08 2021-12-07 深圳市聚和源科技有限公司 盖合组件及电池
JPWO2023063222A1 (https=) * 2021-10-11 2023-04-20
JP2024505532A (ja) * 2021-10-22 2024-02-06 エルジー エナジー ソリューション リミテッド 円筒形バッテリー、それを含むバッテリーパック及び自動車
JP2025055828A (ja) * 2023-09-27 2025-04-08 トヨタ自動車株式会社 蓄電セル

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110880563B (zh) * 2019-10-10 2021-12-14 宁德新能源科技有限公司 电池壳体组件及具有所述电池壳体组件的电池
WO2022010249A1 (ko) * 2020-07-10 2022-01-13 삼성에스디아이 주식회사 이차 전지

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60129067U (ja) * 1984-02-07 1985-08-29 日立マクセル株式会社 薄形密閉電池
JPS60147070U (ja) * 1984-03-08 1985-09-30 三洋電機株式会社 密閉型電池
JPH0254162U (https=) * 1988-10-13 1990-04-19
JP2002231216A (ja) * 2001-02-02 2002-08-16 Sanyo Electric Co Ltd 集電リード、これを用いた蓄電池およびその製造方法
JP2004095268A (ja) * 2002-08-30 2004-03-25 Sony Corp 非水電解質二次電池
JP2014096374A (ja) 2013-12-13 2014-05-22 Gs Yuasa Corp 電池
JP2015130317A (ja) 2013-12-04 2015-07-16 日立マクセル株式会社 非水電解質二次電池
CN204596910U (zh) * 2015-04-27 2015-08-26 深圳金山电池有限公司 一种纽扣型锂离子二次电池
CN208797048U (zh) * 2018-09-30 2019-04-26 广东微电新能源有限公司 用于电子设备的电池

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4946016Y1 (https=) * 1968-09-30 1974-12-17
JPS57203462U (https=) * 1981-06-19 1982-12-24
JP6048080B2 (ja) * 2011-11-29 2016-12-21 株式会社Ｇｓユアサ 蓄電素子
KR102306448B1 (ko) * 2016-09-06 2021-09-28 삼성에스디아이 주식회사 이차전지
WO2018100853A1 (ja) * 2016-11-30 2018-06-07 パナソニックＩｐマネジメント株式会社 円筒形電池
CN110459705A (zh) * 2019-09-05 2019-11-15 重庆市紫建电子有限公司 一种提升径向空间利用率的纽扣电池

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60129067U (ja) * 1984-02-07 1985-08-29 日立マクセル株式会社 薄形密閉電池
JPS60147070U (ja) * 1984-03-08 1985-09-30 三洋電機株式会社 密閉型電池
JPH0254162U (https=) * 1988-10-13 1990-04-19
JP2002231216A (ja) * 2001-02-02 2002-08-16 Sanyo Electric Co Ltd 集電リード、これを用いた蓄電池およびその製造方法
JP2004095268A (ja) * 2002-08-30 2004-03-25 Sony Corp 非水電解質二次電池
JP2015130317A (ja) 2013-12-04 2015-07-16 日立マクセル株式会社 非水電解質二次電池
JP2014096374A (ja) 2013-12-13 2014-05-22 Gs Yuasa Corp 電池
CN204596910U (zh) * 2015-04-27 2015-08-26 深圳金山电池有限公司 一种纽扣型锂离子二次电池
CN208797048U (zh) * 2018-09-30 2019-04-26 广东微电新能源有限公司 用于电子设备的电池

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4086995A4

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113764790A (zh) * 2021-10-08 2021-12-07 深圳市聚和源科技有限公司 盖合组件及电池
JPWO2023063222A1 (https=) * 2021-10-11 2023-04-20
WO2023063222A1 (ja) * 2021-10-11 2023-04-20 株式会社村田製作所 二次電池
JP7754185B2 (ja) 2021-10-11 2025-10-15 株式会社村田製作所 二次電池
JP2024505532A (ja) * 2021-10-22 2024-02-06 エルジー エナジー ソリューション リミテッド 円筒形バッテリー、それを含むバッテリーパック及び自動車
JP7709535B2 (ja) 2021-10-22 2025-07-16 エルジー エナジー ソリューション リミテッド 円筒形バッテリー、それを含むバッテリーパック及び自動車
JP2025055828A (ja) * 2023-09-27 2025-04-08 トヨタ自動車株式会社 蓄電セル

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CN115104216A (zh) 2022-09-23
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US20220384919A1 (en) 2022-12-01
JPWO2021161812A1 (https=) 2021-08-19
CN117977126A (zh) 2024-05-03

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