WO2021200737A1 - 封口体および電池 - Google Patents

封口体および電池 Download PDF

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Publication number
WO2021200737A1
WO2021200737A1 PCT/JP2021/013076 JP2021013076W WO2021200737A1 WO 2021200737 A1 WO2021200737 A1 WO 2021200737A1 JP 2021013076 W JP2021013076 W JP 2021013076W WO 2021200737 A1 WO2021200737 A1 WO 2021200737A1
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WO
WIPO (PCT)
Prior art keywords
sealing
sealing plate
terminal member
sealing body
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/JP2021/013076
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English (en)
French (fr)
Japanese (ja)
Inventor
坂本　真一
下司　真也
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.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management 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 Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to US17/906,620 priority Critical patent/US12512542B2/en
Priority to JP2022512155A priority patent/JP7678526B2/ja
Priority to EP21781070.4A priority patent/EP4131588A4/en
Priority to CN202180013624.5A priority patent/CN115088117B/zh
Publication of WO2021200737A1 publication Critical patent/WO2021200737A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/191—Inorganic material
    • 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
    • H01M50/147—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
    • H01M50/155—Lids or covers characterised by the material
    • H01M50/157—Inorganic material
    • H01M50/159—Metals
    • 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
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • 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
    • H01M50/562—Terminals characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to a battery including an electrode body and a battery can for accommodating the electrode body.
  • the battery usually has a battery can and an electrode body housed in the battery can.
  • the battery can has an opening edge, and the opening of the opening edge is sealed by a sealing body.
  • a metal dish-shaped lid case, a thin plate-shaped safety valve, and a metal lid cap are stacked in order from the inside to the outside of the battery can. It has.
  • a sealing lid is crimped to the open end of the battery can via an insulating gasket to seal the battery can.
  • Patent Document 1 since the lid case, the safety valve, and the laminated body in which the lid cap is overlapped are crimped in a state of being sandwiched between the open ends of the battery cans via an insulating gasket, the height of the crimped portion in the battery is high. Will be higher. Therefore, the energy density of the battery may decrease.
  • One aspect of the present disclosure includes a sealing plate made of a first metal and a terminal member made of a second metal different from the first metal and held by the sealing plate. It has a fixing portion to which the terminal member is fixed, an annular peripheral edge portion located on the peripheral edge, and a thin-walled portion formed between the fixing portion and the peripheral edge portion, and the fixing portion is the sealing portion.
  • the present invention relates to a sealing body having a protrusion protruding from the outer surface of the plate, and the protrusion is bent inward so that a part of the terminal member is sandwiched between the fixed portion and the protrusion. ..
  • a case having a tube, a bottom that closes one end of the tube, and an opening edge that is continuous with the other end of the tube, and housed in the tube.
  • the present invention relates to a battery, comprising an electrode body and the sealing body, the sealing body being fixed to the opening edge so as to seal the opening of the opening edge.
  • the present disclosure it is possible to prevent the peripheral edge portion of the sealing body from becoming a laminated body. Therefore, even when the terminal member is provided, it is possible to suppress an increase in the height of the crimped portion in the battery, and the energy density can be easily increased.
  • FIG. 1 is a cross-sectional view of a main part showing an enlarged engagement portion between a protrusion of a sealing plate and a flange portion of a terminal member.
  • the sealing body according to the present embodiment has a sealing plate composed of a first metal and a terminal member composed of a second metal different from the first metal and held by the sealing plate.
  • the sealing plate has a fixing portion to which the terminal member is fixed, an annular peripheral edge portion located on the peripheral edge, and a thin-walled portion formed between the fixing portion and the peripheral edge portion.
  • the fixing portion has a protrusion protruding from the outer surface of the sealing plate. The protrusion is bent inward so that a part of the terminal member is sandwiched between the fixed portion and the protrusion.
  • the sealing body is used in the battery to seal the opening of the case that houses the electrode body.
  • the sealing plate is electrically connected to one electrode (for example, a positive electrode) of the electrode body.
  • the sealing plate is also electrically connected to a current collecting member such as an external lead wire, and an electrical connection between one electrode of the electrode body and the external lead wire is established via the sealing plate. Will be done.
  • the sealing plate and the external lead wire are joined by welding, for example.
  • the first metal constituting the sealing plate for example, aluminum or an aluminum alloy can be preferably used because it is lightweight and has excellent corrosion resistance.
  • the sealing plate containing aluminum is not easy to weld to a current collecting member made of a metal other than aluminum, and it is difficult to form a good bond by welding. Therefore, there is a demand that the current collector member and the sealing body be connected to each other with a metal material that can be easily welded (for example, a material containing iron).
  • Patent Document 1 it is also possible to adopt the configuration of Patent Document 1 and use an iron lid cap to superimpose the lid case, the safety valve, and the lid cap and seal them by caulking.
  • the opening edge is crimped to the laminated member to seal it, the height (thickness) of the crimped portion is required, and when the battery is to be maintained at a constant height, the height of the crimped portion is required. This limits the height of the electrode body.
  • the height of the electrode body is maintained, the height of the battery becomes high. Therefore, it is difficult to realize a battery having a high energy density.
  • the sealing plate and the terminal member are made of different materials, a good electrical connection can be maintained between the sealing plate and the terminal member.
  • the electrical connection with the current collecting member can be made via the terminal member fixed to the sealing plate.
  • the material of the terminal member any material that can be easily connected to the current collector member may be used, and a material containing iron may be used.
  • the current collector has a function of electrically connecting a plurality of batteries to each other, or a function of connecting the batteries to an external electronic device or electronic circuit.
  • the current collecting member may be a lead wire or a metal plate having welded portions at both ends.
  • the opening of the case can be sealed by, for example, crimping the opening edge to the sealing plate via a gasket, the height of the crimped portion does not increase due to the terminal member. Therefore, a battery having a high energy density can be easily realized.
  • the peripheral edge portion of the sealing body is a laminated body of members
  • the interface between the members of the caulked portion which can be a passage for gas and moisture, is compared with the configuration in which the peripheral edge portion is a laminated body of members. The number of is reduced. Therefore, the reliability of sealing as a battery is improved.
  • the sealing plate has a fixing portion, and the fixing portion is provided with a protrusion protruding from the outer surface of the sealing plate.
  • the protrusions are planted from the outer surface of the sealing plate and then bend and extend inward (that is, toward the inner circumference of the cylinder in the battery after sealing), and are between the fixing portion and the protrusions. A part of the end of the terminal member is sandwiched. As a result, the terminal member and the sealing plate are engaged and electrically connected, and the terminal member is fixed to the sealing plate. Further, the protrusion is bent in a direction away from the thin portion of the sealing plate and is engaged with the terminal member. Therefore, when the protrusion is bent, it is possible to prevent a part of the fixed portion from escaping to the thin-walled portion side and fluctuating the thickness of the thin-walled portion.
  • the protrusion is bent by applying a force to the protrusion using, for example, a mold. At this time, a force in the bending direction is also applied to the portion of the protrusion located on the root side of the bending position. Along with this, the root portion may be deformed and the thickness of the sealing plate on the bending direction side may fluctuate. Therefore, if there is a thin-walled portion on the bending direction side from the planting position of the protrusion, the thickness of the thin-walled portion may fluctuate. On the other hand, by bending the protrusion in the direction away from the thin portion, it is possible to suppress the thickness of the thin portion from being biased.
  • the fixing portion is a portion of the sealing plate that is expected to come into contact with the terminal member and a region in the vicinity thereof. It is also a region that is thicker than the thin-walled portion and has a thin-walled portion formed around it.
  • the protrusion may be formed in an annular shape (or cylindrical shape) at the fixed portion, or may be provided intermittently in the circumferential direction.
  • the terminal member has, for example, a top plate portion, a side wall portion that bends and extends from the peripheral edge of the top plate portion toward the sealing plate, and a flange portion.
  • the flange portion is connected to the side wall portion and extends outward in a plane direction parallel to, for example, the top plate portion. Since the terminal member has a side wall portion and a flange portion, it is possible to suppress the transfer of heat energy generated when the terminal member is welded to the current collector member in the top plate portion to the inside of the battery.
  • the side wall portion may be bent and extended over the entire circumference of the top plate portion. In this case, the terminal member may have a cap shape.
  • the top plate portion corresponds to the lid portion of the cap
  • the side wall portion corresponds to the side wall portion of the cap.
  • the side wall portion may be arranged intermittently in the circumferential direction from the top plate portion.
  • the terminal member may be a disk having no side wall portion or flange portion. In this case, the protrusion bends toward the peripheral edge of the terminal member which is a disk.
  • the flange portion extends from the end of the side wall portion on the sealing plate side in the direction away from the top plate portion (that is, the outer peripheral direction of the cylinder portion in the battery after sealing).
  • the flange portion may project in a direction away from the top plate portion over the entire circumference of the end portion of the side wall portion, or may protrude in a direction away from the top plate portion in a part of the entire circumference of the end portion of the side wall portion. You may.
  • the flange portion may be bent from the end portion of the side wall portion and extend from the top plate portion, or may be erected on the outer peripheral surface of the side wall portion.
  • the flange portion may be plate-shaped, and may be a columnar or conical protrusion, particularly when the flange portion is partially provided instead of the entire circumference of the side wall portion.
  • a concave portion having a stepped shape or a slope may be formed on the outer peripheral edge of the flange portion, and a part of the protruding portion bent toward the terminal member may be accommodated in the concave portion. With this configuration, the connection space between the terminal member and the protrusion can be reduced.
  • the end faces of the flange portions connected to the main surfaces located at both ends in the thickness direction are inclined, and the protrusions are bent so as to be inclined along the inclination of the end faces. You may. With this configuration, the end face of the flange portion and the protrusion can be electrically connected.
  • the flange portion is sandwiched between the protrusion of the sealing plate and the outer surface of the sealing plate facing the protrusion, and is fixed in close contact with the sealing plate by pressing. Further, a welding joint may be formed between the protrusion and the flange so that the adhesion is strong.
  • the joining by welding may be a joining by laser welding. Laser welding may be performed by irradiating a laser from the outer surface of the protrusion and performing through welding. In this case, if the thickness of the flange portion is thinner than the thickness of the side wall portion, through welding can be easily performed.
  • the protrusion and the flange portion may be simply joined by welding. ..
  • a battery with high energy density can be realized by using the above-mentioned sealing body.
  • the battery according to the present embodiment has a cylinder, a bottom that closes one end of the cylinder, and a case having a continuous opening edge at the other end of the cylinder, and an electrode body housed in the cylinder. And the above-mentioned sealing body.
  • the sealing body is fixed to the opening edge so as to seal the opening of the opening edge.
  • the direction from the sealing body to the electrode body is the downward direction
  • the direction from the electrode body to the sealing body is the upward direction.
  • the direction parallel to the axis of the cylinder toward the opening edge is the upward direction.
  • the length in the vertical direction may be referred to as a height.
  • the opening of the case can be sealed, for example, by arranging a gasket on the peripheral edge of the sealing plate and crimping the opening edge to the peripheral edge of the sealing plate via the gasket.
  • a gasket on the peripheral edge of the sealing plate and crimping the opening edge to the peripheral edge of the sealing plate via the gasket.
  • an annular groove is formed on the outer peripheral surface of the cylinder so that the inner peripheral surface of the cylinder protrudes inward of the cylinder, and the opening edge is bent on the opening side of the groove.
  • the opening edge can be bent so that the gasket and the sealing plate are sandwiched between the opening edge and the groove to seal between the sealing body and the opening edge.
  • the space between the sealing body and the opening edge can be sealed by sandwiching the sealing body including the gasket between the groove and the opening edge.
  • the terminal member since the terminal member is not used for the sealing, the height of the electrode body is not limited by the terminal member, and it does not hinder the realization of a battery having a high energy density.
  • FIG. 1 is a schematic vertical cross-sectional view of a main part of the battery 10 provided with the sealing body 130 according to the present embodiment.
  • the battery 10 has a cylindrical shape, and includes a cylindrical bottomed case 110, a cylindrical electrode body 120 housed in a can, and a sealing body 130 that seals the opening of the case 110.
  • the case 110 has a tubular portion 111 that houses the electrode body 120, a bottom portion 112 that closes one end of the tubular portion 111, and an opening edge portion 113 that is continuous with the other end of the tubular portion 111.
  • the opening of the opening edge 113 is closed by the sealing body 130.
  • the sealing body 130 has a sealing plate 131 and a gasket 133 arranged on the peripheral edge 131B of the sealing plate 131.
  • the sealing plate 131 may have a disk shape and has an explosion-proof function.
  • the sealing plate 131 is provided in the central region, and includes a thick-walled fixing portion 131A and a peripheral portion 131B and a thin-walled portion 131C that exerts an explosion-proof function in order to secure structural strength.
  • the thin-walled portion 131C is provided in the region between the peripheral edge portion 131B and the fixing portion 131A.
  • the peripheral edge portion 131B and the thin-walled portion 131C are formed in an annular shape so as to surround the fixing portion 131A, for example.
  • the sealing body 130 further includes a terminal member 135.
  • the terminal member 135 engages with the sealing plate 131 at the fixing portion 131A and is held by the sealing plate 131.
  • the terminal member 135 has, for example, a cap shape having a top plate portion 135A and a side wall portion 135B that bends and extends from the peripheral edge of the top plate portion 135A toward the sealing plate 131.
  • the flange portion 135C bends from the end portion of the side wall portion 135B on the sealing plate 131 side toward the outer circumference of the tubular portion 111 and extends away from the top plate portion 135A.
  • the fixing portion 131A is provided with a protruding portion 131D protruding from the outer surface of the sealing plate 131.
  • the protrusion 131D bends in the inner peripheral direction of the cylinder 111 and engages with the flange 135C of the terminal member 135.
  • the protrusion 131D and the flange 135C may be formed over the entire circumference of the side wall 135B, or may be formed intermittently at a part of the circumference of the side wall 135B.
  • the sealing plate 131 is made of the first metal.
  • the first metal may be, for example, a metal containing aluminum.
  • the metal containing aluminum may be, for example, metallic aluminum or an aluminum alloy.
  • the terminal member 135 is made of a second metal different from the first metal constituting the sealing plate 131.
  • the second metal may be, for example, a metal containing at least one of iron and nickel.
  • the metal containing iron may be, for example, iron or an iron alloy.
  • As the iron alloy stainless steel may be used.
  • As the second metal iron or an iron alloy plated with nickel or the like may be used.
  • a welded joint may be formed at the engaging portion between the protrusion 131D and the flange 135C.
  • Welding may be performed by, for example, irradiating the outer surface of the protrusion 131D covering the flange portion 135C with a laser beam from the side of the top plate portion 135A to perform penetration welding.
  • Welding may be performed at one location on the periphery of the side wall portion 135B, or may be performed at a plurality of locations.
  • FIG. 2 is an enlarged cross-sectional view showing the engaging portion between the sealing plate 131 and the terminal member 135 in FIG. 1.
  • a welding mark 170 is formed by through welding between the protrusion 131D and the flange 135C.
  • the welding mark 170 can be formed to a depth exceeding the outer surface of the sealing plate 131 (fixing portion 131A) that penetrates the flange portion 135C and faces the protrusion 131D across the flange portion 135C.
  • the thickness D 2 of the flange portion 135C may be thinner than the thickness D 1 of the side wall portion 135B in order to facilitate the formation of a joint by welding to a depth penetrating the flange portion 135C.
  • the sealing plate 131 is also in contact with the terminal plate 160 on the inner surface (the surface on the side facing the electrode body 120) of the fixing portion 131A.
  • the terminal plate 160 has a central region 160A, a peripheral edge portion 160B, and a thin-walled portion 160C provided between the central region 160A and the peripheral edge portion 160B.
  • the central region 160A of the terminal plate 160 is in contact with the fixing portion 131A of the sealing plate 131.
  • the central region 160A of the terminal plate 160 and the fixing portion 131A of the sealing plate 131 may be welded.
  • the peripheral edge portion 160B of the terminal plate 160 is connected to the end portion of the internal lead 122 led out from the positive electrode or the negative electrode constituting the electrode body 120.
  • the sealing plate 131 (and the terminal member 135) has one terminal function.
  • An insulating member 150 is interposed between the peripheral edge portion 160B of the terminal plate 160 and the fixing portion 131A of the sealing plate 131.
  • the insulating member 150 may be formed integrally with the gasket 133.
  • the terminal plate 160 and the insulating member 150 are not essential.
  • the internal lead 122 may be directly connected to the fixed portion 131A.
  • a groove portion 114 having an inner diameter smaller than the inner diameter of the cylinder portion of the opening edge portion 113 and the inner diameter of the cylinder portion 111 is provided. That is, the opening edge portion 113 is continuous with the tubular portion 111 via the groove portion 114.
  • the sealing body 130 is arranged on the upper side of the groove portion 114 (the side away from the electrode body 120), and the opening edge portion 113 is bent so as to sandwich the sealing body 130 (sealing plate 131 and gasket 133) arranged on the groove portion 114. ing. As a result, the gasket 133 is pressed in the vertical direction, and the battery 10 is sealed. The airtightness of the battery 10 is ensured by the repulsive force of the gasket due to the pressing.
  • An internal insulating plate 140 may be arranged below the groove 114 (on the side of the electrode body 120) to prevent contact between the electrode body 120 and the sealing body 130 and the terminal plate 160.
  • the internal insulating plate 140 is provided with a predetermined lead hole 141.
  • the internal lead 122 derived from one of the electrodes constituting the electrode body 120 is connected to the terminal plate 160 through the lead hole 141, and is electrically connected to the sealing body 130.
  • the other electrode (second electrode) constituting the electrode body 120 is electrically connected to the case 110.
  • the sealing plate 131 and the gasket 133 may be integrally molded by, for example, insert molding.
  • the material of the gasket 133 is not particularly limited, and for example, polypropylene (PP), polyphenylene sulfide (PPS), polyethylene (PE), polybutylene terephthalate (PBT), and perfluoroalkoxy alkane (PFA) are examples of materials that can be easily integrally molded. , Polytetrafluoroethylene (PTFE), polyamide (PA) and the like can be used.
  • PP polypropylene
  • PPS polyphenylene sulfide
  • PE polyethylene
  • PBT polybutylene terephthalate
  • PFA perfluoroalkoxy alkane
  • PTFE Polytetrafluoroethylene
  • PA polyamide
  • the above-mentioned current cutoff mechanism does not limit the present invention.
  • the present invention can be applied to both a battery provided with a current cutoff mechanism and a battery not provided with the current cutoff mechanism.
  • the configuration of the current cutoff mechanism is not limited to the above specific example, and any configuration may be adopted.
  • the terminal member 135 has a cap shape, but it does not necessarily have to be a cap shape.
  • the side wall portion 135B may be bent and extended all around the top plate portion 135A, or the side wall portion may not be provided on a part of the circumference of the top plate portion 135A. Since the terminal member 135 is not used for the sealing, even if there is a region where the side wall portion 135B (and the flange portion 135C) is not provided in a part of the circumference of the top plate portion 135A, the airtightness is affected. Do not give.
  • the present invention is not limited to the groove.
  • the terminal member of the present disclosure is not limited to the battery manufactured by the above-mentioned sealing method, and can be preferably used even when the conventional sealing method without a groove is adopted.
  • a sealing method without providing a groove for example, a method of sealing by welding or a method of pressing the side wall portion of the gasket in the radial direction of the opening (direction toward the axis of the tubular portion) via the opening edge portion of the case.
  • a method of sealing by welding or a method of pressing the side wall portion of the gasket in the radial direction of the opening (direction toward the axis of the tubular portion) via the opening edge portion of the case. can be mentioned.
  • the height of the electrode body can be increased by the width (height) of the groove portion, so that the capacity can be further increased.
  • the cylindrical electrode body 120 is a winding type, and is configured by spirally winding a positive electrode and a negative electrode via a separator.
  • An internal lead 122 is connected to one of the positive electrode and the negative electrode.
  • the internal lead 122 is electrically connected to the fixing portion 131A of the sealing plate 131.
  • Another lead wire is connected to the other of the positive electrode and the negative electrode, and the other lead wire is connected to the inner surface of the case 110 by welding or the like.
  • the negative electrode has a band-shaped negative electrode current collector and negative electrode active material layers formed on both sides of the negative electrode current collector.
  • a metal film, a metal foil, or the like is used for the negative electrode current collector.
  • the material of the negative electrode current collector is preferably at least one selected from the group consisting of copper, nickel, titanium and alloys thereof and stainless steel.
  • the thickness of the negative electrode current collector is preferably, for example, 5 to 30 ⁇ m.
  • the negative electrode active material layer contains a negative electrode active material, and if necessary, contains a binder and a conductive agent.
  • the negative electrode active material layer may be a deposited film formed by a vapor phase method (for example, thin film deposition).
  • Examples of the negative electrode active material include Li metals, metals or alloys that electrochemically react with Li, carbon materials (for example, graphite), silicon alloys, silicon oxides, and metal oxides (for example, lithium titanate).
  • the thickness of the negative electrode active material layer is preferably, for example, 1 to 300 ⁇ m.
  • the positive electrode has a band-shaped positive electrode current collector and positive electrode active material layers formed on both sides of the positive electrode current collector.
  • a metal film, a metal foil (stainless steel foil, aluminum foil, or aluminum alloy foil) or the like is used for the positive electrode current collector.
  • the positive electrode active material layer contains a positive electrode active material and a binder, and optionally contains a conductive agent.
  • the positive electrode active material is not particularly limited, but a lithium-containing composite oxide such as LiCoO 2 or LiNiO 2 can be used.
  • the thickness of the positive electrode active material layer is preferably, for example, 1 to 300 ⁇ m.
  • Graphite, carbon black, etc. are used as the conductive agent contained in each active material layer.
  • the amount of the conductive agent is, for example, 0 to 20 parts by mass per 100 parts by mass of the active material.
  • Fluororesin, acrylic resin, rubber particles and the like are used as the binder contained in the active material layer.
  • the amount of the binder is, for example, 0.5 to 15 parts by mass per 100 parts by mass of the active material.
  • separator a resin-made microporous membrane or a non-woven fabric is preferably used.
  • material (resin) of the separator polyolefin, polyamide, polyamideimide and the like are preferable.
  • the thickness of the separator is, for example, 8 to 30 ⁇ m.
  • a non-aqueous solvent in which a lithium salt is dissolved can be used as the electrolyte.
  • the lithium salt include LiClO 4 , LiBF 4 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , and imide salts.
  • the non-aqueous solvent include cyclic carbonates such as propylene carbonate, ethylene carbonate and butylene carbonate, chain carbonates such as diethyl carbonate, ethylmethyl carbonate and dimethyl carbonate, and cyclic carboxylic acid esters such as ⁇ -butyrolactone and ⁇ -valerolactone. And so on.
  • the lithium ion secondary battery has been described above as an example, the present disclosure can be used in a battery that seals a battery can using a sealing body regardless of whether it is a primary battery or a secondary battery.
  • the battery according to the present disclosure can be used for various can-shaped batteries, and is suitable for use as a power source for, for example, portable devices, hybrid vehicles, electric vehicles, electrically assisted bicycles, electric bikes, and the like.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)
PCT/JP2021/013076 2020-03-31 2021-03-26 封口体および電池 Ceased WO2021200737A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US17/906,620 US12512542B2 (en) 2020-03-31 2021-03-26 Sealing body and battery
JP2022512155A JP7678526B2 (ja) 2020-03-31 2021-03-26 封口体および電池
EP21781070.4A EP4131588A4 (en) 2020-03-31 2021-03-26 SEALING BODY AND BATTERY
CN202180013624.5A CN115088117B (zh) 2020-03-31 2021-03-26 封口体以及电池

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-064950 2020-03-31
JP2020064950 2020-03-31

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WO2021200737A1 true WO2021200737A1 (ja) 2021-10-07

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EP (1) EP4131588A4 (https=)
JP (1) JP7678526B2 (https=)
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WO (1) WO2021200737A1 (https=)

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US20230163387A1 (en) 2023-05-25
EP4131588A1 (en) 2023-02-08
CN115088117B (zh) 2024-08-27
JPWO2021200737A1 (https=) 2021-10-07
EP4131588A4 (en) 2024-07-10
US12512542B2 (en) 2025-12-30
JP7678526B2 (ja) 2025-05-16

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