WO2023063222A1 - 二次電池 - Google Patents

二次電池 Download PDF

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Publication number
WO2023063222A1
WO2023063222A1 PCT/JP2022/037490 JP2022037490W WO2023063222A1 WO 2023063222 A1 WO2023063222 A1 WO 2023063222A1 JP 2022037490 W JP2022037490 W JP 2022037490W WO 2023063222 A1 WO2023063222 A1 WO 2023063222A1
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WO
WIPO (PCT)
Prior art keywords
secondary battery
positive electrode
negative electrode
insulating film
battery
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/JP2022/037490
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English (en)
French (fr)
Japanese (ja)
Inventor
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 JP2023554470A priority Critical patent/JP7754185B2/ja
Priority to CN202280068574.5A priority patent/CN118104063A/zh
Publication of WO2023063222A1 publication Critical patent/WO2023063222A1/ja
Priority to US18/427,492 priority patent/US20240356162A1/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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/179—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside the 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
    • H01M50/545—Terminals formed by the casing of the 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
    • H01M50/548—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
    • H01M50/547—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
    • 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
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular 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
    • H01M50/552—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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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

  • This technology relates to secondary batteries.
  • This secondary battery has battery elements (a positive electrode, a negative electrode, and an electrolyte) inside an exterior member, and various studies have been made on the configuration of the secondary battery.
  • the electrode body is housed inside the exterior case, and a flat electrode terminal member is arranged outside the case body via a seal member (see, for example, Patent Document 1).
  • An electrode body is housed inside an exterior body, and the exterior body has a laminate structure including a resin layer and a metal layer (see Patent Document 2, for example).
  • a power generation element is housed inside a battery case sealed with a sealing plate, and an electrode terminal is provided on the sealing plate via an insulator (see, for example, Patent Document 3).
  • a secondary battery includes a conductive exterior member having a through hole, an electrode terminal arranged outside the exterior member and shielding the through hole, and the exterior member and the electrode terminal. It comprises an insulating sealing member disposed therebetween, a battery element housed inside the exterior member, and an insulating member disposed between the exterior member and the battery element.
  • the exterior member includes a recessed portion provided with a through hole, and the exterior member is bent inwardly at the recessed portion.
  • the recessed portion has a facing surface facing the battery element, and the insulating member covers the facing surface and is fixed to the facing surface.
  • a battery element is housed inside a conductive exterior member having a through hole, and electrode terminals arranged outside the exterior member shield the through hole.
  • An insulating sealing member is arranged between the exterior member and the electrode terminal, a recess having a through hole is provided in the exterior member, and the insulating member covers the facing surface of the recess. Since it is covered and fixed to the opposing surface, it is possible to achieve both excellent capacity characteristics and excellent operational stability.
  • FIG. 2 is an enlarged cross-sectional view showing the configuration of the secondary battery shown in FIG. 1;
  • FIG. 3 is an enlarged sectional view showing the configuration of the battery element shown in FIG. 2;
  • FIG. 3 is a plan view showing the configuration of the main part of the secondary battery shown in FIG. 2;
  • FIG. 4 is a cross-sectional view for explaining the operation of the secondary battery; It is a perspective view for explaining a manufacturing process of a secondary battery.
  • 2 is an enlarged cross-sectional view showing the configuration of a secondary battery of Comparative Example 1.
  • FIG. 3 is a cross-sectional view showing an enlarged configuration of a secondary battery of Comparative Example 2.
  • FIG. 1 is an enlarged cross-sectional view showing the configuration of the secondary battery shown in FIG. 1
  • FIG. 3 is an enlarged sectional view showing the configuration of the battery element shown in FIG. 2
  • FIG. 3 is a plan view showing the configuration of the main part of the secondary battery shown in FIG. 2
  • FIG. 4 is a
  • FIG. 11 is a cross-sectional view showing an enlarged configuration of a secondary battery of Comparative Example 3.
  • FIG. FIG. 11 is a cross-sectional view showing an enlarged configuration of a secondary battery of Comparative Example 4;
  • 11 is a plan view showing the configuration of the main part of the secondary battery shown in FIG. 10;
  • FIG. FIG. 11 is a cross-sectional view showing an enlarged configuration of a secondary battery of Modification 1 (No. 1); 13 is a plan view showing the configuration of the main part of the secondary battery shown in FIG. 12;
  • FIG. 10 is an enlarged cross-sectional view showing the configuration of a secondary battery of modification 1 (part 2);
  • 15 is a plan view showing the configuration of the main part of the secondary battery shown in FIG. 14;
  • FIG. 11 is a cross-sectional view showing an enlarged configuration of a secondary battery of Modification 2;
  • FIG. 11 is a cross-sectional view showing an enlarged configuration of a secondary battery of Modification 3;
  • the secondary battery described here is a so-called coin-type or button-type secondary battery.
  • this secondary battery includes a pair of bottom portions facing each other and side wall portions connected to the pair of bottom portions, respectively. Also, the secondary battery has an outer diameter and a height, and the height is smaller than the outer diameter.
  • the “outer diameter” is the diameter (maximum diameter) of each of the pair of bottoms, and the “height” is the distance (maximum distance) from one bottom to the other.
  • the charging and discharging principle of the secondary battery is not particularly limited, the case where the battery capacity is obtained by utilizing the absorption and release of the electrode reactant will be described below.
  • This secondary battery includes an electrolyte together with a positive electrode and a negative electrode, and the charge capacity of the negative electrode 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. This is to prevent electrode reactants from depositing on the surface of the negative electrode during charging.
  • the type of electrode reactant is not particularly limited, but specifically light metals such as alkali metals and alkaline earth metals.
  • alkali metals are lithium, sodium and potassium
  • alkaline earth metals are beryllium, magnesium and calcium.
  • lithium ion secondary battery A secondary battery whose battery capacity is obtained by utilizing the absorption and release of lithium is a so-called lithium ion secondary battery.
  • lithium ion secondary battery lithium is intercalated and deintercalated in an ionic state.
  • FIG. 1 shows a perspective configuration of a secondary battery.
  • FIG. 2 shows an enlarged cross-sectional configuration of the secondary battery shown in FIG.
  • FIG. 3 shows an enlarged cross-sectional configuration of the battery element 40 shown in FIG.
  • FIG. 4 shows a planar configuration of main parts of the secondary battery shown in FIG.
  • the upper side in FIG. 2 is the upper side of the secondary battery
  • the lower side in FIG. 2 is the lower side of the secondary battery
  • the positive electrode 41, the negative electrode 42, the separator 43, the positive electrode lead 51, and the negative electrode lead 52 are shown linearly in order to simplify the illustration.
  • FIG. 3 only part of the battery element 40 is shown.
  • FIG. 4 shows the lid 12 and the insulating film 60 as viewed from below, and the outer edge and inner edge (winding center space 40K) of the battery element 40 are indicated by dashed lines. .
  • the secondary battery described here is a button-type secondary battery having an outer diameter D and a height H, as shown in FIGS.
  • This secondary battery 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 (columnar), and the ratio D/H of the outer diameter D to the height H is greater than one.
  • the outer diameter D is 3 mm to 30 mm and the height H is 0.5 mm to 70 mm.
  • the ratio D/H is preferably 25 or less.
  • the secondary battery includes an outer can 10, an external terminal 20, a gasket 30, a battery element 40, a positive electrode lead 51, a negative electrode lead 52, and an insulating film 60 .
  • the exterior can 10 is a hollow exterior member that houses the battery element 40 and the like, and has a through hole 10K.
  • the outer can 10 has a three-dimensional shape similar to the three-dimensional shape of the secondary battery, that is, it has a flat and columnar (cylindrical) three-dimensional shape.
  • the outer can 10 has an upper bottom portion M1 and a lower bottom portion M2 facing each other, and a side wall portion M3.
  • the side wall portion M3 is arranged between the upper base portion M1 and the lower base portion M2, and is connected to the upper base portion M1 and the lower base portion M2, respectively. Since the three-dimensional shape of the outer can 10 is flat and columnar as described above, the planar shape of each of the upper bottom portion M1 and the lower bottom portion M2 is circular, and the surface of the side wall portion M3 faces outward. It is a convex curved surface.
  • the inner diameter of the through-hole 10K may be the same as the inner diameter of the winding central space 40K, which will be described later, or may differ from the inner diameter of the winding central space 40K.
  • FIG. 2 shows a case where the inner diameter of the through hole 10K is larger than the inner diameter of the winding center space 40K.
  • the outer can 10 includes a recessed portion 10U, and a through hole 10K is provided in the recessed portion 10U. At this recessed portion 10U, the outer can 10 is bent so as to be depressed toward the inside, so that a part of the outer can 10 is bent so as to form a downward step.
  • the recessed portion 10U has a facing surface 10UM that faces the battery element 40.
  • the facing surface 10UM is the bottom surface of the lid portion 12, that is, the bottom surface of the portion of the lid portion 12 that is closest to the battery element 40 (recess portion 10U).
  • the hollow portion 10U does not exist in the through hole 10K, the area where the through hole 10K exists is excluded from the facing surface 10UM.
  • the shape of the recessed portion 10U that is, the shape defined by the outer edge of the recessed portion 10U when the secondary battery is viewed from above is not particularly limited.
  • the shape of the recessed portion 10U is circular.
  • the inner diameter and depth of the recessed portion 10U are not particularly limited, they can be set arbitrarily.
  • the outer can 10 includes a storage portion 11 and a lid portion 12, and the storage portion 11 and the lid portion 12 are joined together. Specifically, since the storage portion 11 and the lid portion 12 are welded together, the storage portion 11 is sealed by the lid portion 12 .
  • the housing portion 11 is a substantially cylindrical member (lower bottom portion M2 and side wall portion M3) for housing the battery element 40 and the like therein.
  • the storage portion 11 has a structure in which the lower bottom portion M2 and the side wall portion M3 are integrated with each other. Since the housing portion 11 has a hollow structure with an open upper end and a closed lower end, it has an opening 11K at its upper end.
  • the lid portion 12 is a substantially disc-shaped member (upper bottom portion M1) that closes the opening portion 11K, and includes a recess portion 10U provided with a through hole 10K.
  • the through hole 10K is used as a connection path for electrically connecting the battery element 40 and the external terminal 20 to each other, as will be described later.
  • the lid portion 12 is already joined to the housing portion 11 as described above, so that the opening portion 11K is closed by the lid portion 12 . Therefore, even if the external appearance of the secondary battery is observed, it is conceivable that it cannot be confirmed after the fact whether or not the storage portion 11 has the opening portion 11K.
  • the surface of the outer can 10 more specifically, Ideally, there should be a weld mark left on the boundary between the storage portion 11 and the lid portion 12 . Therefore, based on the presence or absence of welding marks, it can be confirmed after the fact whether the storage portion 11 has the opening portion 11K.
  • the outer can 10 is a can in which two members (the storage portion 11 and the lid portion 12) that are physically separated from each other are joined to each other, a so-called joined can. More specifically, the outer can 10 in which the storage portion 11 and the lid portion 12 are welded together is a so-called welded can. As a result, since the outer can 10 after bonding is physically one member as a whole, it cannot be separated into two members (the storage portion 11 and the lid portion 12) afterwards.
  • the outer can 10, which is a bonded can, is a so-called crimpless can, which is different from a crimped can formed using caulking. This is because the volumetric energy density increases because the element space volume increases inside the outer can 10 .
  • This “element space volume” is the volume (effective volume) of the internal space of the outer can 10 that can be used to house the battery element 40 .
  • the outer can 10 which is a joint can, does not have a portion where two or more members overlap each other, and does not have a portion where two or more members overlap each other.
  • Does not have a portion folded over means that the outer can 10 is not processed (bent) so that a part of the outer can 10 is folded over. Further, “not having a portion where two or more members overlap each other” means that the outer can 10 is physically one member after the completion of the secondary battery. It literally means that it cannot be separated into two or more members. That is, the state of the outer can 10 in the secondary battery after completion is not a state in which two or more members are combined while overlapping each other so that they can be separated later.
  • each of the storage portion 11 and the lid portion 12 has conductivity.
  • the outer can 10 is connected to the battery element 40 (negative electrode 42 to be described later) through the negative electrode lead 52 , and thus is electrically connected to the negative electrode 42 . Therefore, the outer can 10 functions as an external connection terminal for the negative electrode 42 . Since the secondary battery does not need to be provided with an external connection terminal for the negative electrode 42 separately from the outer can 10, the decrease in the element space volume due to the presence of the external connection terminal for the negative electrode 42 is suppressed. is. As a result, the element space volume increases, so the volumetric energy density increases.
  • the outer can 10 contains one or more of conductive materials such as metal materials and alloy materials, and specific examples of the conductive materials include iron, copper, nickel, , stainless steel, iron alloys, copper alloys and nickel alloys.
  • conductive materials such as metal materials and alloy materials
  • specific examples of the conductive materials include iron, copper, nickel, , stainless steel, iron alloys, copper alloys and nickel alloys.
  • the type of stainless steel is not particularly limited, but specific examples include SUS304 and SUS316.
  • the material for forming the storage portion 11 and the material for forming the lid portion 12 may be the same as or different from each other.
  • the outer can 10 is preferably a so-called metal can. This is because the deformation of the outer can 10 is suppressed because the rigidity of the outer can 10 is improved.
  • This metal can is a can containing one or more of the metal materials and alloy materials described above.
  • the lid portion 12 is insulated via a gasket 30 from the external terminal 20 functioning as an external connection terminal for the positive electrode 41, as will be described later. This is because contact (short circuit) between the outer can 10 (terminal for external connection of the negative electrode 42) and the external terminal 20 (terminal for external connection of the positive electrode 41) is prevented.
  • the external terminal 20 is an electrode terminal connected to an electronic device when the secondary battery is mounted on the electronic device, as shown in FIGS.
  • the external terminal 20 is arranged outside the outer can 10 and shields the through hole 10K.
  • the external terminal 20 is supported by the outer can 10 via a gasket 30 . More specifically, the external terminal 20 is thermally welded to the lid portion 12 via a gasket 30, as will be described later. Thereby, the external terminal 20 is fixed to the lid portion 12 via the gasket 30 while being insulated from the lid portion 12 via the gasket 30 .
  • the external terminal 20 is electrically connected to the positive electrode 41 because it is connected to the battery element 40 (positive electrode 41 ) through the positive electrode lead 51 . Thereby, the external terminal 20 functions as an external connection terminal for the positive electrode 41 .
  • the secondary battery is connected to the electronic device via the external terminal 20 (terminal for external connection of the positive electrode 41) and the outer can 10 (terminal for external connection of the negative electrode 42). becomes operable using a secondary battery as a power source.
  • the external terminal 20 is a substantially plate-shaped member.
  • the three-dimensional shape of the external terminal 20 is not particularly limited, it is specifically a flat plate shape.
  • a part or the whole of the external terminal 20 is arranged inside the recess 10U.
  • the entire external terminal 20 is arranged inside the recess 10U, that is, inside the space surrounded by the recess 10U.
  • the external terminal 20 is housed inside the recessed portion 10U so as not to protrude outward (upward) from the recessed portion 10U.
  • the reason why the outer can 10 includes the recessed portion 10U and the external terminal 20 is accommodated inside the recessed portion 10U is that the volumetric energy density increases, thereby increasing the battery capacity.
  • the external terminal 20 when the external terminal 20 is not housed inside the recessed portion 10U, a portion of the external terminal 20 protrudes outside the recessed portion 10U.
  • the volume of the battery element 40 housed inside the outer can 10 (the facing area of the positive electrode 41 and the negative electrode 42) does not change, while the external terminal 20 protrudes outside the recess 10U.
  • the height H increases as much as the This reduces the volumetric energy density and thus the battery capacity.
  • the external terminal 20 when the external terminal 20 is accommodated inside the recessed portion 10U, the external terminal 20 does not protrude outside the recessed portion 10U. In this case, the volume of the battery element 40 housed inside the outer can 10 does not change, and the height H does not increase. This increases the volumetric energy density, thereby increasing the battery capacity.
  • the external terminal 20 Since the outer diameter of the external terminal 20 is smaller than the inner diameter of the recessed portion 10U, the external terminal 20 is separated from the lid portion 12 at its periphery. Thereby, the gasket 30 is arranged in at least part of the space between the lid portion 12 and the external terminal 20 inside the recess portion 10U. The lid portion 12 and the external terminal 20 are arranged at locations where they can come into contact with each other.
  • the external terminal 20 includes one or more of conductive materials such as metal materials and alloy materials, and specific examples of the conductive materials are aluminum and aluminum alloys.
  • the external terminal 20 may contain a clad material.
  • This clad material includes an aluminum layer and a nickel layer in order from the side closer to the gasket 30, and the aluminum layer and the nickel layer are roll-bonded to each other.
  • the clad material may contain a nickel alloy layer instead of the nickel layer.
  • the clad material includes an aluminum layer, a stainless steel (SUS) layer, and a nickel layer in order from the side closest to the gasket 30, and the aluminum layer, the stainless steel layer, and the nickel layer may be roll-bonded to each other.
  • SUS stainless steel
  • the external terminal 20 functions as an external connection terminal for the positive electrode 41, and also functions as a release valve for releasing the internal pressure of the outer can 10 when the internal pressure rises excessively, as will be described later.
  • the cause of this increase in internal pressure is the generation of gas due to the decomposition reaction of the electrolyte during charging and discharging, and the cause of promoting the decomposition reaction of the electrolyte is internal short circuit of the secondary battery, secondary battery heating and discharge of a secondary battery due to high current conditions.
  • the gasket 30 is an insulating sealing member arranged between the outer can 10 and the external terminal 20, as shown in FIG.
  • the gasket 30 is arranged between the lid portion 12 and the external terminal 20, and has a through hole 30K at a location overlapping with the through hole 10K. Thereby, the gasket 30 is arranged so as not to block the through hole 10K.
  • the external terminal 20 is connected to the lid portion via the gasket 30 as described above. 12 is heat-sealed.
  • the type of polymer compound is not particularly limited, but specific examples include polypropylene and polyethylene.
  • the installation area of the gasket 30 is not particularly limited, and can be set arbitrarily.
  • the gasket 30 is arranged between the upper surface of the lid portion 12 and the lower surface of the external terminal 20 inside the recess portion 10U.
  • the installation area of the gasket 30 may extend to an area outside the area between the upper surface of the lid portion 12 and the lower surface of the external terminal 20 .
  • the inner diameter of the through-hole 30K may be the same as the inner diameter of the through-hole 10K, or may be different from the inner diameter of the through-hole 10K.
  • FIG. 2 shows a case where the inner diameter of the through-hole 30K and the inner diameter of the through-hole 10K are the same.
  • the battery element 40 is a power generation element that advances charge/discharge reactions, and is housed inside the outer can 10. As shown in FIG.
  • the battery element 40 includes a positive electrode 41 as a first electrode, a negative electrode 42 as a second electrode, a separator 43, and an electrolytic solution (not shown) as a liquid electrolyte.
  • the battery element 40 is a so-called wound electrode body
  • the element structure of the battery element 40 is a so-called wound type.
  • the positive electrode 41 and the negative electrode 42 are laminated with the separator 43 interposed therebetween, and the positive electrode 41, the negative electrode 42 and the separator 43 are wound.
  • the positive electrode 41 and the negative electrode 42 are wound while facing each other with the separator 43 interposed therebetween, so that the battery element 40 has a winding center space 40K as a winding core.
  • the winding direction (horizontal direction) of the positive electrode 41, the negative electrode 42, and the separator 43 ) intersects the penetration direction of the through hole 10K.
  • the battery element 40 Since the battery element 40 has a three-dimensional shape similar to that of the outer can 10, it has a flat and cylindrical three-dimensional shape. Compared to the case where the battery element 40 has a three-dimensional shape different from the three-dimensional shape of the outer can 10, when the battery element 40 is accommodated inside the outer can 10, dead space (the outer can 10 and the battery element 40), the internal space of the outer can 10 is effectively utilized. As a result, the element space volume increases, so the volumetric energy density increases.
  • the positive electrode 41 includes a positive electrode current collector 41A and a positive electrode active material layer 41B, as shown in FIGS.
  • the positive electrode current collector 41A is a conductive support that supports the positive electrode active material layer 41B, and has a pair of surfaces on which the positive electrode active material layer 41B is provided.
  • the positive electrode current collector 41A contains a conductive material such as a metal material, and a specific example of the conductive material is aluminum.
  • the positive electrode active material layer 41B is provided on both sides of the positive electrode current collector 41A and contains one or more of positive electrode active materials capable of intercalating and deintercalating lithium.
  • the positive electrode active material layer 41B may be provided only on one side of the positive electrode current collector 41A on the side where the positive electrode 41 faces the negative electrode 42 .
  • the positive electrode active material layer 41B may further contain one or more of a positive electrode binder, a positive electrode conductive agent, and the like.
  • a method for forming the positive electrode active material layer 41B is not particularly limited, but a specific example is a coating method.
  • the positive electrode active material contains a lithium-containing compound. This is because a high energy density can be obtained.
  • This lithium-containing compound is a compound containing lithium as a constituent element, and more specifically, a compound containing lithium and one or more transition metal elements as constituent elements.
  • the lithium-containing compound may further contain one or more of other elements (elements other than lithium and transition metal elements).
  • the type of lithium-containing compound is not particularly limited, but specific examples include oxides, phosphoric acid compounds, silicic acid compounds and boric acid compounds. Specific examples of oxides include LiNiO 2 , LiCoO 2 and LiMn 2 O 4 . Specific examples of phosphoric acid compounds include LiFePO4 and LiMnPO4 .
  • the positive electrode binder contains one or more of synthetic rubber and polymer compounds.
  • a specific example of the synthetic rubber is styrene-butadiene rubber, and a specific example of the polymer compound is polyvinylidene fluoride.
  • the positive electrode conductive agent contains one or more of conductive materials such as carbon materials, and specific examples of the conductive materials include graphite, carbon black, acetylene black, and ketjen black. be.
  • the conductive material may be a metal material, a polymer compound, or the like.
  • the negative electrode 42 includes a negative electrode current collector 42A and a negative electrode active material layer 42B, as shown in FIGS.
  • the negative electrode current collector 42A is a conductive support that supports the negative electrode active material layer 42B, and has a pair of surfaces on which the negative electrode active material layer 42B is provided.
  • the negative electrode current collector 42A contains a conductive material such as a metal material, and a specific example of the conductive material is copper.
  • the negative electrode active material layer 42B is provided on both sides of the negative electrode current collector 42A, and contains one or more of negative electrode active materials capable of intercalating and deintercalating lithium.
  • the negative electrode active material layer 42B may be provided only on one side of the negative electrode current collector 42A on the side where the negative electrode 42 faces the positive electrode 41 .
  • the negative electrode active material layer 42B may further contain one or more of a negative electrode binder, a negative electrode conductor, and the like. The details of the negative electrode binder and the negative electrode electrical conductor are the same as the details of the positive electrode binder and the positive electrode electrical conductor.
  • the method of forming the negative electrode active material layer 42B is not particularly limited, but specifically, any one of a coating method, a vapor phase method, a liquid phase method, a thermal spraying method, a firing method (sintering method), and the like, or Two or more types.
  • the negative electrode active material contains one or more of a carbon material, a metal-based material, and the like. This is because a high energy density can be obtained.
  • carbon materials include graphitizable carbon, non-graphitizable carbon and graphite (natural graphite and artificial graphite).
  • a metallic material is a material containing as constituent elements one or more of metallic elements and semi-metallic elements capable of forming an alloy with lithium. , silicon and tin.
  • the metallic material may be a single substance, an alloy, a compound, a mixture of two or more thereof, or a material containing two or more phases thereof.
  • Specific examples of metallic materials include TiSi 2 and SiO x (0 ⁇ x ⁇ 2 or 0.2 ⁇ x ⁇ 1.4).
  • the separator 43 is an insulating porous film interposed between the positive electrode 41 and the negative electrode 42, as shown in FIGS. Allows lithium ions to pass through.
  • This separator 43 contains a polymer compound such as polyethylene.
  • the electrolyte is impregnated in each of the positive electrode 41, the negative electrode 42 and the separator 43, and contains a solvent and an electrolyte salt.
  • the solvent contains one or more of non-aqueous solvents (organic solvents), and the electrolytic solution containing the non-aqueous solvent is a so-called non-aqueous electrolytic solution.
  • the non-aqueous solvents are esters, ethers, and the like, and more specifically, carbonate compounds, carboxylic acid ester compounds, lactone compounds, and the like.
  • the carbonate compounds include cyclic carbonates and chain carbonates.
  • Specific examples of the cyclic carbonate include ethylene carbonate and propylene carbonate
  • specific examples of the chain carbonate include dimethyl carbonate, diethyl carbonate and ethylmethyl carbonate.
  • the carboxylic acid ester compound is a chain carboxylic acid ester or the like.
  • chain carboxylic acid esters include methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, propyl propionate, ethyl trimethylacetate, methyl butyrate and ethyl butyrate.
  • Lactone-based compounds include lactones. Specific examples of lactones include ⁇ -butyrolactone and ⁇ -valerolactone.
  • the ethers may be 1,2-dimethoxyethane, tetrahydrofuran, 1,3-dioxolane, 1,4-dioxane, etc., in addition to the lactone compounds described above.
  • Electrolyte salts are light metal salts such as lithium salts.
  • Specific examples of lithium salts include lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), lithium trifluoromethanesulfonate (LiCF 3 SO 3 ), lithium bis(fluorosulfonyl)imide (LiN ( FSO2 ) 2 ), bis(trifluoromethanesulfonyl )imidolithium (LiN(CF3SO2)2), lithium tris(trifluoromethanesulfonyl)methide (LiC(CF3SO2)3 ) , bis ( oxalato )boron lithium oxide (LiB( C2O4 ) 2 ) and lithium difluoro( oxalato )borate (LiB( C2O4 ) F2 ).
  • LiPF 6 lithium hexafluorophosphate
  • LiBF 4 lithium
  • the content of the electrolyte salt is not particularly limited, but specifically, it is 0.3 mol/kg to 3.0 mol/kg with respect to the solvent. This is because high ionic conductivity can be obtained.
  • the positive electrode lead 51 is a wiring member for electrically connecting the positive electrode 41 to the external terminal 20, as shown in FIG.
  • the positive electrode lead 51 is connected to the external terminal 20 via the through hole 10K and is also connected to the positive current collector 41A of the positive electrode 41. are electrically connected to each other.
  • the positive electrode lead 51 is connected to the positive electrode 41 on the side closer to the lid portion 12 , it is connected to the upper end portion of the positive electrode 41 .
  • the secondary battery has one positive electrode lead 51 , it may have two or more positive electrode leads 51 . This is because the electrical resistance of the battery element 40 decreases as the number of the positive electrode leads 51 increases.
  • the details of the material forming the positive electrode lead 51 are the same as the details of the material forming the positive electrode current collector 41A. However, the material for forming the positive electrode lead 51 and the material for forming the positive electrode current collector 41A may be the same as or different from each other.
  • the positive electrode lead 51 is physically separated from the positive electrode current collector 41A, it is a separate member from the positive electrode current collector 41A. However, since the positive electrode lead 51 is physically continuous with the positive electrode current collector 41A, it may be a member integrated with the positive electrode current collector 41A.
  • the negative electrode lead 52 is a member for electrically connecting the negative electrode 42 to the outer can 10, as shown in FIG.
  • the negative electrode lead 52 is connected to the housing portion 11 (lower bottom portion M2) and to the negative electrode current collector 42A of the negative electrode 42. properly connected.
  • the negative electrode lead 52 is connected to the negative electrode 42 on the far side from the lid portion 12 , so it is connected to the lower end portion of the negative electrode 42 .
  • the secondary battery has one negative electrode lead 52 , it may have two or more negative electrode leads 52 . This is because the electrical resistance of the battery element 40 decreases as the number of the negative electrode leads 52 increases.
  • the details of the material forming the negative electrode lead 52 are the same as the details of the material forming the negative electrode current collector 42A. However, the material for forming the negative electrode lead 52 and the material for forming the negative electrode current collector 42A may be the same as or different from each other.
  • the negative electrode lead 52 is physically separated from the negative electrode current collector 42A, it is a separate member from the negative electrode current collector 42A. However, since the negative electrode lead 52 is physically continuous with the negative electrode current collector 42A, it may be a member integrated with the negative electrode current collector 42A.
  • the insulating film 60 is an insulating member arranged between the outer can 10 and the battery element 40, as shown in FIGS.
  • the insulating film 60 is arranged between the lid portion 12 and the battery element 40, and has a through hole 60K at a location overlapping with the through hole 10K. Thereby, the insulating film 60 is arranged so as not to block the through hole 10K.
  • the inner diameter of the through-hole 60K may be the same as the inner diameter of the through-hole 10K, or may be different from the inner diameter of the through-hole 10K.
  • FIG. 2 shows a case where the inner diameter of the through hole 60K and the inner diameter of the through hole 10K are the same.
  • the insulating film 60 covers the facing surface 10UM and is fixed to the facing surface 10UM. In FIG. 4, the insulating film 60 is shaded in order to make the installation range of the insulating film 60 easy to understand.
  • the secondary battery is provided with an insulating film 60, and the insulating film 60 covers the opposing surface 10UM and is fixed to the opposing surface 10UM in a part (a recess) of the exterior can 10 (lid portion 12). This is because even if the portion 10U) protrudes toward the battery element 40, the occurrence of a short circuit is prevented.
  • the insulating film 60 may be damaged when the secondary battery is subjected to vibration, impact, or the like. Since the positions are likely to shift, the positive electrode 41 and the outer can 10 may come into contact with each other at a part of the facing surface 10UM. As a result, as described above, a short circuit is more likely to occur, making it difficult for the secondary battery to operate stably.
  • the insulating film 60 exists between the battery element 40 and the outer can 10, and the insulating film 60 covers the facing surface 10UM and is fixed to the facing surface 10UM, , the positive electrode 41 and the outer can 10 are less likely to come into contact with each other over the entire facing surface 10UM, and the position of the insulating film 60 is less likely to shift even if the secondary battery receives vibrations and impacts. As a result, a short circuit is less likely to occur, so that the secondary battery can operate stably.
  • the electrolytic solution is injected into the storage portion 11 that stores the wound body 40Z.
  • the insulating film 60 does not get in the way when it is closed. This also provides an advantage in that the wound body 40Z is easily impregnated with the electrolytic solution (see FIG. 6). The details of the reasons explained here will be described later.
  • the insulating film 60 contains one or more of insulating materials such as insulating polymer compounds, and a specific example of the insulating material is polyimide.
  • the insulating film 60 may be a non-adhesive member that does not include an adhesive layer, or an adhesive member (so-called adhesive tape) that includes an adhesive layer (not shown). Since the non-adhesive insulating film 60 is adhered to the opposing surface 10UM via an adhesive, it is fixed to the opposing surface 10UM. Since the insulating film 60 having adhesiveness is adhered to the opposing surface 10UM via the adhesive layer, it is fixed to the opposing surface 10UM.
  • the insulating film 60 is fixed to the facing surface 10UM, the insulating film 60 is arranged between the lid portion 12 and the positive electrode lead 51, and the positive electrode lead 51 is arranged between the insulating film 60 and the battery element 40. part of is placed.
  • the secondary battery may further include one or more of other components (not shown).
  • the other component is the sealant.
  • This sealant is an insulating covering member covering the surface of the positive electrode lead 51, and the positive electrode lead 51 is insulated from the outer can 10 and the negative electrode 42 via the sealant.
  • the sealant contains one or more of insulating materials such as insulating polymer compounds, and a specific example of the insulating material is polyimide.
  • the other insulating film is an insulating member arranged between the storage portion 11 (lower bottom portion M2) and the battery element 40, and the material for forming the other insulating film is the same as the material for forming the insulating film 60. be.
  • FIG. 5 shows a cross-sectional configuration corresponding to FIG. 2 in order to explain the operation of the secondary battery. The operation during charging and discharging will be described below, and then the operation when an abnormality occurs will be described.
  • the external terminal 20 is arranged outside the lid portion 12 and fixed to the lid portion 12 via the gasket 30 .
  • the exterior can 10 is sealed by the external terminals 20 in a normal state, and the battery element 40 is sealed inside the exterior can 10 .
  • FIG. 5 shows a case where the external terminal 20 is partially separated from the lid portion 12 .
  • the housing portion 11 is joined to the lid portion 12, whereas the external terminals 20 are fixed to the lid portion 12 via the gasket 30.
  • the fixing strength heat welding strength
  • the fixing strength is smaller than the bonding strength (welding strength) of the lid portion 12 to the storage portion 11 .
  • the external terminal 20 if the internal pressure of the outer can 10 rises excessively, the external terminal 20 separates from the lid portion 12 before the lid portion 12 separates from the storage portion 11 . Since the external terminal 20 functions as a release valve before the outer can 10 bursts, the outer can 10 is prevented from bursting.
  • FIG. 6 shows a perspective configuration corresponding to FIG. 1 in order to explain the manufacturing process of the secondary battery. However, since FIG. 6 shows the state before the lid portion 12 is joined to the storage portion 11 , the lid portion 12 is separated from the storage portion 11 .
  • the positive electrode 41 and the negative electrode 42 are prepared and the electrolytic solution is prepared according to the procedure described below. is assembled, and the secondary battery after assembly is stabilized.
  • FIG. 1 to FIG. 4 already described will be referred to along with FIG.
  • a housing portion 11 and a lid portion 12 that are physically separated from each other are used to form the outer can 10 .
  • the storage portion 11 has the opening portion 11K
  • the lid portion 12 includes the recess portion 10U.
  • the external terminal 20 is heat-sealed to the lid portion 12 via the gasket 30 in advance, and the insulating film 60, which is an adhesive tape, is adhered thereto.
  • a paste-like positive electrode mixture slurry is prepared by putting a positive electrode mixture in which a positive electrode active material, a positive electrode binder, and a positive electrode conductor are mixed together into a solvent.
  • This solvent may be an aqueous solvent or an organic solvent.
  • the cathode active material layer 41B is formed by applying the cathode mixture slurry to both surfaces of the cathode current collector 41A.
  • the cathode active material layer 41B is compression-molded using a roll press or the like. In this case, the positive electrode active material layer 41B may be heated and the compression molding may be repeated multiple times. As a result, the cathode active material layers 41B are formed on both surfaces of the cathode current collector 41A, so that the cathode 41 is produced.
  • a paste-like negative electrode mixture slurry is prepared by putting a negative electrode mixture in which a negative electrode active material, a negative electrode binder, and a negative electrode conductor are mixed together into a solvent.
  • the anode active material layer 42B is formed by applying the anode mixture slurry to both surfaces of the anode current collector 42A.
  • the negative electrode active material layer 42B is compression-molded using a roll press or the like. The details of the compression molding of the negative electrode active material layer 42B are the same as the details of the compression molding of the positive electrode active material layer 41B. As a result, the negative electrode 42 is manufactured because the negative electrode active material layers 42B are formed on both surfaces of the negative electrode current collector 42A.
  • the positive electrode lead 51 is connected to the positive electrode current collector 41A of the positive electrode 41 by welding or the like, and the negative electrode lead 52 is connected to the negative electrode current collector 42A of the negative electrode 42 by welding or the like. to connect.
  • FIG. 6 illustration of each of the positive electrode lead 51 and the negative electrode lead 52 is omitted.
  • the wound body 40Z is stored inside the storage section 11 through the opening 11K.
  • a welding method or the like is used to connect the negative electrode lead 52 to the storage portion 11 .
  • the positive electrode lead 51 is connected to the external terminal 20 via the through hole 10K using a welding method or the like.
  • the electrolytic solution is injected into the storage portion 11 through the opening portion 11K.
  • the wound body 40Z (the positive electrode 41, the negative electrode 42, and the separator 43) is impregnated with the electrolytic solution, so that the battery element 40, which is a wound electrode body, is produced.
  • the electrolyte solution inside the storage portion 11 is less than the case where the insulating film 60 is adhered to the battery element 40 .
  • the insulating film 60 does not get in the way when injecting. As a result, the electrolytic solution is easily injected into the storage portion 11, so that the wound body 40Z is easily impregnated with the electrolytic solution.
  • the electrolytic solution when the electrolytic solution is injected into the inside of the housing portion 11, part of the electrolytic solution is supplied to the inside of the winding central space 40K.
  • the winding central space 40K is used as an impregnation path for the electrolytic solution, so that the electrolytic solution is easily impregnated by the wound body 40Z.
  • the lid portion 12 is joined to the storage portion 11 using a joining method such as welding.
  • a joining method such as welding.
  • the outer can 10 is formed, and the battery element 40 and the like are housed inside the outer can 10, so that the secondary battery is assembled as shown in FIG.
  • the secondary battery after assembly is charged and discharged.
  • Various conditions such as environmental temperature, number of charge/discharge times (number of cycles), and charge/discharge conditions can be arbitrarily set.
  • films are formed on the respective surfaces of the positive electrode 41 and the negative electrode 42 in the battery element 40, so that the state of the secondary battery is electrochemically stabilized.
  • the battery element 40 is housed inside the conductive outer can 10 having the through hole 10K, and the external terminal 20 arranged outside the outer can 10 shields the through hole 10K.
  • An insulating gasket 30 is arranged between the outer can 10 and the external terminal 20 .
  • a recessed portion 10U having a through hole 10K is provided in the outer can 10, and an insulating film 60 between the outer can 10 and the battery element 40 covers and faces the facing surface 10UM of the recessed portion 10U. It is fixed to the surface 10UM. Therefore, for reasons described below, both excellent capacitance characteristics and excellent operational stability can be achieved.
  • FIG. 7 shows the cross-sectional configuration of the secondary battery of Comparative Example 1, and corresponds to FIG.
  • FIG. 8 shows the cross-sectional structure of the secondary battery of Comparative Example 2, and corresponds to FIG.
  • FIG. 9 shows the cross-sectional structure of the secondary battery of Comparative Example 3, and corresponds to FIG. 10 shows the cross-sectional structure of the secondary battery of Comparative Example 4, corresponding to FIG. 2, and
  • FIG. 11 shows the planar structure of the main part of the secondary battery shown in FIG. , corresponding to FIG.
  • the secondary battery of Comparative Example 1 has the same configuration as that of the secondary battery of the present embodiment (FIG. 2), except that the insulating film 60 is not provided. there is
  • Each of the secondary batteries of Comparative Examples 2 and 3 has an insulating film 60 as shown in FIGS. Except for this, it has the same configuration as the configuration of the secondary battery (FIG. 2) of the present embodiment. However, in the secondary battery of Comparative Example 2, the insulating film 60 covers the entire upper end surface 40M of the battery element 40, and the insulating film 60 is provided with an outlet 60Q for leading the positive electrode lead 51. there is In the secondary battery of Comparative Example 3, insulating film 60 covers only a portion of upper end surface 40M.
  • the secondary battery of Comparative Example 4 as shown in FIGS. 10 and 11, has an insulating film 60 except that the insulating film 60 covers only a part of the facing surface 10UM. , has the same configuration as the configuration of the secondary battery (FIGS. 2 and 4) of the present embodiment. In FIG. 11, the facing surface 10UM is lightly shaded.
  • the insulating film 60 is not interposed between the outer can 10 and the battery element 40, as shown in FIG. In this case, there is no insulating film 60 that hinders the injection of the electrolytic solution from the opening 11K into the storage portion 11 in the manufacturing process of the secondary battery. As a result, the process of injecting the electrolytic solution is not hindered by the insulating film 60, so that the wound body 40Z is easily impregnated with the electrolytic solution. Therefore, since the amount of electrolyte retained by the battery element 40 increases, the battery capacity is ensured.
  • part of the outer can 10 protrudes toward the battery element 40 .
  • the facing surface 10UM approaches the battery element 40
  • the battery element 40 (the positive electrode 41) and the outer can 10 (the external connection terminal of the negative electrode 42) approach each other.
  • contact (short circuit) between the positive electrode 41 and the outer can 10 is likely to occur, making it difficult for the secondary battery to operate stably.
  • the insulating film 60 covers the entire upper end surface 40M, the insulating film 60 becomes a hindrance when injecting the electrolytic solution from the opening 11K into the storage portion 11 in the manufacturing process of the secondary battery. exist. As a result, the process of injecting the electrolytic solution is hindered by the insulating film 60, so that the wound body 40Z is less likely to be impregnated with the electrolytic solution. Therefore, the amount of electrolyte retained by the battery element 40 is reduced, and the battery capacity is also reduced.
  • the secondary battery of Comparative Example 2 is easier to operate stably, but the battery capacity is reduced. Therefore, it is difficult to achieve both excellent capacitance characteristics and excellent operational stability.
  • the insulating film 60 is interposed between the battery element 40 and the outer can 10.
  • the insulating film 60 covers only a portion of the upper end surface 40M.
  • the electrolyte injection process is less likely to be hindered by the insulating film 60, so that the wound body 40Z is more likely to be impregnated with the electrolyte at locations where the insulating film 60 does not exist. Therefore, since the amount of electrolyte retained by the battery element 40 increases, the battery capacity also increases.
  • the wound body 40Z is likely to be impregnated with the electrolytic solution particularly in places where the insulating film 60 does not exist, whereas the electrolytic solution penetrates into the wound body 40Z in places where the insulating film 60 exists. Impregnation becomes difficult. As a result, the battery capacity increases as compared with the secondary battery of Comparative Example 2, but the battery capacity does not increase sufficiently.
  • the insulating film 60 is fixed to the facing surface 10UM.
  • the insulating film 60 does not get in the way when injecting the electrolytic solution into. As a result, for the reason described above, the amount of electrolyte retained by the battery element 40 is increased, so that the battery capacity is ensured.
  • the insulating film 60 is interposed between the battery element 40 and the outer can 10, a short circuit between the positive electrode 41 and the outer can 10 is less likely to occur where the insulating film 60 exists.
  • the insulating film 60 covers only a part of the facing surface 10UM, a short circuit between the positive electrode 41 and the outer can 10 is likely to occur where the insulating film 60 does not exist.
  • the insulating film 60 is fixed to the facing surface 10UM, so the battery capacity is secured for the reason described above. .
  • an insulating film 60 is interposed between the battery element 40 and the outer can 10, and the insulating film 60 covers the entire facing surface 10UM.
  • a short circuit between the positive electrode 41 and the outer can 10 is less likely to occur over the entire facing surface 10UM, so that the secondary battery can operate stably.
  • the battery capacity is ensured, and the secondary battery can be stably operated easily. Therefore, it is possible to achieve both excellent capacitance characteristics and excellent operational stability.
  • the volumetric energy density increases. Therefore, since the battery capacity is further increased, a higher effect can be obtained.
  • the outer can 10 includes the storage portion 11 and the lid portion 12, and the storage portion 11 and the lid portion 12 are joined to each other, the outer can 10, which is a so-called crimpless joining can, can be used for the two-piece construction. Since the secondary battery is constructed, the volumetric energy density is further increased. Therefore, since the capacity characteristics are further improved, a higher effect can be obtained.
  • the external terminal 20 is the external connection terminal of the positive electrode 41.
  • the outer can 10 functions as an external connection terminal for the negative electrode 42 .
  • the secondary battery does not need to be provided with an external connection terminal for the positive electrode 41 and an external connection terminal for the negative electrode 42 separately from the outer can 10 and the external terminal 20, thereby further increasing the volumetric energy density. Therefore, since the capacity characteristics are further improved, a higher effect can be obtained.
  • the outer can 10 has a flat and columnar three-dimensional shape, excellent capacity characteristics and excellent operational stability can be obtained even in a small secondary battery in which the internal pressure of the outer can 10 tends to increase. Therefore, a higher effect can be obtained.
  • the outer can 10 is a metal can, deformation of the outer can 10 is suppressed. Therefore, from the viewpoint of the physical durability of the outer can 10, the secondary battery can operate stably and easily, so that a higher effect can be obtained.
  • the secondary battery is a lithium-ion secondary battery
  • a sufficient battery capacity can be stably obtained by utilizing the absorption and release of lithium, so a higher effect can be obtained.
  • the installation area of the insulating film 60 may extend inward from the facing surface 10UM.
  • the insulating film 60 is arranged so as not to block the through hole 10K in order to secure the connection path of the positive electrode lead 51 to the external terminal 20 .
  • the insulating film 60 is used to secure the battery capacity and facilitates stable operation of the secondary battery, so similar effects can be obtained.
  • the contact between the positive electrode lead 51 and the outer can 10 (lid portion 12) is prevented by using the portion of the insulating film 60 that extends inward, so that a higher effect can be obtained. be able to.
  • the installation area of the insulating film 60 may extend outside the facing surface 10UM. Since the position of the outer edge of the insulating film 60 is not particularly limited, it can be set arbitrarily.
  • the insulating film 60 is used to secure the battery capacity and facilitates stable operation of the secondary battery, so similar effects can be obtained.
  • the positive electrode 41 can be prevented even when the secondary battery is unintentionally deformed due to impact such as when dropped. and the outer can 10 (lid portion 12) are easily prevented from coming into contact with each other, so that a higher effect can be obtained.
  • the insulating film 60 extends too far outside the facing surface 10UM, it may become difficult to stably form the outer can 10 in the manufacturing process of the secondary battery. It should be noted.
  • the installation area of the insulating film 60 is excessively expanded outward, when the lid portion 12 is joined to the storage portion 11 , a portion of the insulating film 60 is formed between the storage portion 11 and the lid portion 12 . becomes easier to intervene. As a result, it becomes difficult to join the lid portion 12 to the storage portion 11, and thus it may become difficult to form the outer can 10 in a stable manner.
  • the lid portion 12 can be easily joined to the storage portion 11, so that the outer can 10 can be stably formed.
  • the insulating film 60 is used to secure the battery capacity and facilitates stable operation of the secondary battery, so similar effects can be obtained.
  • the external terminal 20 protrudes outside the recessed portion 10U, the height H increases, resulting in a decrease in volumetric energy density and a decrease in battery capacity.
  • the positive electrode 41 as the first electrode is connected to the external terminal 20 via the positive lead 51
  • the negative electrode 42 as the second electrode is connected to the housing portion 11 via the negative lead 52 .
  • the external terminal 20 functions as an external connection terminal for the positive electrode 41
  • the outer can 10 functions as an external connection terminal for the negative electrode 42 .
  • FIG. 17 which corresponds to FIG. may be connected to the external terminal 20 via the .
  • the outer can 10 may function as an external connection terminal for the positive electrode 41
  • the external terminal 20 may function as an external connection terminal for the negative electrode 42 .
  • the external terminal 20 contains one or more of conductive materials such as a metal material and an alloy material in order to function as a terminal for external connection of the negative electrode 42, and its conductivity is Specific examples of materials include iron, copper, nickel, stainless steel, iron alloys, copper alloys and nickel alloys.
  • conductive materials include aluminum, aluminum alloys and stainless steel.
  • the secondary battery can be connected to the electronic device via the external terminal 20 (the external connection terminal of the negative electrode 42) and the outer can 10 (the external connection terminal of the positive electrode 41). Therefore, the insulating film 60 is used to secure the battery capacity and to facilitate the stable operation of the secondary battery, so that similar effects can be obtained.
  • a separator 43 which is a porous membrane, was used. However, although not specifically illustrated here, instead of the separator 43, a laminated separator including a polymer compound layer may be used.
  • a laminated separator includes a porous membrane having a pair of surfaces and a polymer compound layer provided on one or both sides of the porous membrane. This is because the adhesiveness of the separator to each of the positive electrode 41 and the negative electrode 42 is improved, so that the winding misalignment of the battery element 40 is suppressed. As a result, swelling of the secondary battery is suppressed even if a decomposition reaction of the electrolytic solution occurs.
  • the polymer compound layer contains a polymer compound such as polyvinylidene fluoride. This is because polymer compounds such as polyvinylidene fluoride are excellent in physical strength and electrochemically stable.
  • One or both of the porous film and the polymer compound layer may contain one or more of a plurality of insulating particles. This is because the safety (heat resistance) of the secondary battery is improved because the plurality of insulating particles promote heat dissipation when the secondary battery generates heat.
  • the insulating particles include one or both of inorganic particles and resin particles. Specific examples of inorganic particles are particles such as aluminum oxide, aluminum nitride, boehmite, silicon oxide, titanium oxide, magnesium oxide and zirconium oxide. Specific examples of resin particles are particles of acrylic resins, styrene resins, and the like.
  • the precursor solution is applied to one or both sides of the porous membrane.
  • the porous membrane may be immersed in the precursor solution.
  • a plurality of insulating particles may be added to the precursor solution.
  • the positive electrode 41 and the negative electrode 42 are laminated with the separator 43 and the electrolyte layer interposed therebetween, and the positive electrode 41, the negative electrode 42, the separator 43 and the electrolyte layer are wound.
  • This electrolyte layer is interposed between the positive electrode 41 and the separator 43 and interposed between the negative electrode 42 and the separator 43 .
  • the electrolyte layer may be interposed only between the positive electrode 41 and the separator 43 , or may be interposed only between the negative electrode 42 and the separator 43 .
  • the electrolyte layer contains a polymer compound together with an electrolytic solution, and the electrolytic solution is held by the polymer compound. This is because leakage of the electrolytic solution is prevented.
  • the composition of the electrolytic solution is as described above.
  • Polymer compounds include polyvinylidene fluoride and the like.
  • the element structure of the battery element is a wound type
  • the element structure is not particularly limited, and may be a laminated type or a folded type.
  • the laminate type positive electrodes and negative electrodes are alternately laminated with separators interposed therebetween, and in the multifold type, positive electrodes and negative electrodes are folded in zigzags with separators interposed therebetween.
  • the electrode reactant is lithium has been described, but the electrode reactant is not particularly limited.
  • the electrode reactants may be other alkali metals such as sodium and potassium, or alkaline earth metals such as beryllium, magnesium and calcium, as described above.
  • the electrode reactant may be other light metals 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)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
PCT/JP2022/037490 2021-10-11 2022-10-06 二次電池 Ceased WO2023063222A1 (ja)

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CN202280068574.5A CN118104063A (zh) 2021-10-11 2022-10-06 二次电池
US18/427,492 US20240356162A1 (en) 2021-10-11 2024-01-30 Secondary battery

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EP4632885A1 (en) * 2024-04-09 2025-10-15 Samsung Sdi Co., Ltd. Button cell

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JPH11329407A (ja) * 1998-05-08 1999-11-30 Samsung Display Devices Co Ltd 角形二次電池のキャップアセンブリ
JP2001185100A (ja) * 1999-12-22 2001-07-06 Nec Mobile Energy Kk 密閉型電池
CN211789227U (zh) * 2020-05-12 2020-10-27 路华置富电子(深圳)有限公司 具有新型密封结构的卷绕电芯扣式电池
CN212434725U (zh) * 2020-07-08 2021-01-29 珠海冠宇电池股份有限公司 扣式电池及电子设备
WO2021161812A1 (ja) * 2020-02-12 2021-08-19 株式会社村田製作所 二次電池

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
JPH11329407A (ja) * 1998-05-08 1999-11-30 Samsung Display Devices Co Ltd 角形二次電池のキャップアセンブリ
JP2001185100A (ja) * 1999-12-22 2001-07-06 Nec Mobile Energy Kk 密閉型電池
WO2021161812A1 (ja) * 2020-02-12 2021-08-19 株式会社村田製作所 二次電池
CN211789227U (zh) * 2020-05-12 2020-10-27 路华置富电子(深圳)有限公司 具有新型密封结构的卷绕电芯扣式电池
CN212434725U (zh) * 2020-07-08 2021-01-29 珠海冠宇电池股份有限公司 扣式电池及电子设备

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4632885A1 (en) * 2024-04-09 2025-10-15 Samsung Sdi Co., Ltd. Button cell

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US20240356162A1 (en) 2024-10-24

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