WO2022091934A1 - 円筒形電池用ガスケット、これを用いた円筒形電池の製造方法及び円筒形電池 - Google Patents

円筒形電池用ガスケット、これを用いた円筒形電池の製造方法及び円筒形電池 Download PDF

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Publication number
WO2022091934A1
WO2022091934A1 PCT/JP2021/038932 JP2021038932W WO2022091934A1 WO 2022091934 A1 WO2022091934 A1 WO 2022091934A1 JP 2021038932 W JP2021038932 W JP 2021038932W WO 2022091934 A1 WO2022091934 A1 WO 2022091934A1
Authority
WO
WIPO (PCT)
Prior art keywords
gasket
sealing body
cylindrical battery
inclined portion
cylindrical
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/JP2021/038932
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
良太 沖本
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to US18/032,606 priority Critical patent/US20230395909A1/en
Priority to JP2022559072A priority patent/JP7783188B2/ja
Priority to CN202180070721.8A priority patent/CN116406485B/zh
Publication of WO2022091934A1 publication Critical patent/WO2022091934A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/061—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with positioning means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/062—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces characterised by the geometry of the seat
    • 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
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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 gasket for a cylindrical battery, a method for manufacturing a cylindrical battery using the gasket, and a cylindrical battery.
  • the cylindrical battery is provided with a bottomed cylindrical outer can, a sealing body that closes the opening of the outer can, and a gasket that is interposed between the outer can and the sealing body.
  • the edge of the opening is bent inward in the outer can, and a caulked portion is formed in which the sealing body is fixed to the outer can via a gasket.
  • the sealing body may be used in a state of being attached to a gasket.
  • a protrusion is generally provided on the inside of the gasket so as to cover the flange portion of the sealing body.
  • Patent Document 1 discloses a gasket provided with a protrusion.
  • the protrusion rides on the flange of the sealing body and is pushed out radially inward, the protrusion is pulled by the protrusion and the portion other than the protrusion of the gasket flows inward in the radial direction of the sealing body.
  • the thickness of the portion of the gasket that comes into contact with the sealing body becomes thin, and a gap may be created between the gasket and the outer can. If a gap is created between the gasket and the outer can, the electrolyte inside the battery may seep out when the gasket repeatedly expands and contracts due to changes in ambient temperature.
  • An object of the present disclosure is a gasket for a cylindrical battery having a high airtightness in which a gap between the gasket and the outer can is unlikely to occur when forming a caulked portion, a method for manufacturing a cylindrical battery using the gasket, and a cylindrical battery. Is to provide.
  • the cylindrical battery gasket according to the present disclosure includes a cylindrical tubular portion and an annular portion extending radially inward from one end of the cylindrical portion in the axial direction, and the tubular portion has a cylindrical portion. , It has a protrusion that protrudes inward in the radial direction between both ends in the axial direction, and the protrusion is a first inclined portion located on the annular portion side and a cylindrical portion rather than the first inclined portion. It has a second inclined portion located on the other end side in the axial direction of the above, and the first inclined portion is the ceiling of the flange portion of the sealing body when the sealing body is arranged on the annular portion. It is formed at a position that does not exceed the surface.
  • the method for manufacturing a cylindrical battery using the gasket according to the present disclosure includes a step of attaching the gasket to the sealing body so that the sealing body is arranged on the annular portion, and an opening in a bottomed cylindrical outer can.
  • the step of placing the gasket on the grooved part formed by the side surface of the vicinity protruding inward, and the edge of the opening of the outer can are bent inward and caulked so that the gasket is compressed by the outer can and the sealing body. Includes steps to form the part.
  • the cylindrical battery having a gasket according to the present disclosure includes a bottomed cylindrical outer can and a sealing body arranged on the annular portion of the gasket, and the sealing body is caulked and fixed to the outer can via the gasket. Has been done.
  • the gasket according to the present disclosure it is possible to realize a highly airtight cylindrical battery in which a gap between the gasket and the outer can is unlikely to occur.
  • the cylindrical battery of the present disclosure may be a primary battery or a secondary battery. Further, the battery may be a battery using an aqueous electrolyte, or may be a battery using a non-aqueous electrolyte.
  • a cylindrical battery using a non-aqueous electrolyte for example, a lithium ion battery
  • the cylindrical battery of the present disclosure is not limited thereto.
  • FIG. 1 is a cross-sectional view of a cylindrical battery 10 which is an example of an embodiment.
  • the cylindrical battery 10 includes a wound electrode body 14, a non-aqueous electrolyte, and an outer can 16 containing the electrode body 14 and the non-aqueous electrolyte.
  • the electrode body 14 has a positive electrode 11, a negative electrode 12, and a separator 13, and has a wound structure in which the positive electrode 11 and the negative electrode 12 are spirally wound via the separator 13.
  • the outer can 16 is a bottomed cylindrical metal container having an opening on one side in the axial direction, and the opening of the outer can 16 is closed by a sealing body 17.
  • the battery sealing body 17 side is on the top and the bottom side of the outer can 16 is on the bottom.
  • the positive electrode 11, the negative electrode 12, and the separator 13 constituting the electrode body 14 are all strip-shaped long bodies, and are alternately laminated in the radial direction of the electrode body 14 by being wound in a spiral shape.
  • the negative electrode 12 is formed to have a size one size larger than that of the positive electrode 11 in order to prevent the precipitation of lithium. That is, the negative electrode 12 is formed longer than the positive electrode 11 in the longitudinal direction and the width direction (short direction).
  • the two separators 13 are formed at least one size larger than the positive electrode 11, and are arranged so as to sandwich the positive electrode 11, for example.
  • the electrode body 14 includes a positive electrode lead 20 connected to the positive electrode 11 by welding or the like, and a negative electrode lead 21 connected to the negative electrode 12 by welding or the like.
  • Insulating plates 18 and 19 are arranged above and below the electrode body 14, respectively.
  • the positive electrode lead 20 extends to the sealing body 17 side through the through hole of the insulating plate 18, and the negative electrode lead 21 extends to the bottom side of the outer can 16 through the outside of the insulating plate 19.
  • the positive electrode lead 20 is connected to the lower surface of the internal terminal plate 23 of the sealing body 17 by welding or the like, and the cap 27, which is the top plate of the sealing body 17 electrically connected to the internal terminal plate 23, serves as the positive electrode terminal.
  • the negative electrode lead 21 is connected to the inner surface of the bottom of the outer can 16 by welding or the like, and the outer can 16 serves as a negative electrode terminal.
  • a gasket 28 is provided between the outer can 16 and the sealing body 17 to ensure the airtightness inside the battery.
  • the outer can 16 is formed with a grooved portion 22 that supports the sealing body 17, with a part of the side surface protruding inward.
  • the grooved portion 22 is preferably formed in an annular shape along the circumferential direction of the outer can 16, and the sealing body 17 is supported on the upper surface thereof via the gasket 28.
  • the sealing body 17 is fixed to the upper part of the outer can 16 by the grooved portion 22 and the opening end portion of the outer can 16 crimped against the sealing body 17.
  • the sealing body 17 has a structure in which an internal terminal plate 23, a lower valve body 24, an insulating member 25, an upper valve body 26, and a cap 27 are laminated in this order from the electrode body 14 side.
  • Each member constituting the sealing body 17 has, for example, a disk shape or a ring shape, and each member except the insulating member 25 is electrically connected to each other.
  • the lower valve body 24 and the upper valve body 26 are connected at the central portion of each, and an insulating member 25 is interposed between the peripheral portions of each.
  • FIGS. 2 to 4. are cross-sectional views.
  • FIG. 2 shows a state in which the sealing body 17 to which the gasket 28 is attached is supported by the grooved portion 22 of the outer can 16, and is a state before the caulking portion 42 (see FIG. 4) is formed.
  • the gasket 28 is in contact with the sealing body 17 at the annular portion 30 and the protruding portion 31, which will be described later, in a state of being attached to the sealing body 17.
  • the gasket 28 can be attached to the sealing body 17 so that the sealing body 17 is arranged on the annular portion 30. It is also possible to insert the sealing body 17 into the gasket 28 after arranging the gasket 28 on the grooved portion 22, and attach the gasket 28 to the sealing body 17. That is, in the method for manufacturing a cylindrical battery of the present disclosure, the order of attaching the gasket 28 to the sealing body 17 and the step of arranging the gasket 28 on the groove 22 can be exchanged with each other.
  • the gasket 28 includes a cylindrical tubular portion 29 and an annular portion 30 extending radially inward from one end of the tubular portion 29 in the axial direction.
  • the tubular portion 29 has an inner peripheral surface 34 extending in the axial direction on the inner peripheral side and an outer peripheral surface 35 extending in the axial direction on the outer peripheral side. Further, the tubular portion 29 is provided with a protrusion 31 that projects inward in the radial direction between both ends in the axial direction.
  • the outer diameter of the tubular portion 29 is smaller than the inner diameter of the outer can 16, and the inner diameter is larger than the outer diameter of the sealing body 17.
  • the size of the tubular portion 29 is not limited to this.
  • the inner diameter of the tubular portion 29 may be formed to be the same as or slightly smaller than the outer diameter of the sealing body 17.
  • the gasket 28 is attached to the sealing body 17 so as to push the tubular portion 29 apart.
  • the outer diameter of the tubular portion 29 is formed to be approximately the same as the inner diameter of the opening of the outer can 16, and can be inserted into the grooved portion 22 from the opening of the outer can 16. May be formed in.
  • the annular portion 30 extends radially inward of the outer can 16 and is supported by the grooved portion 22.
  • the tip of the annular portion 30 extends radially inward from the grooved portion 22.
  • the protrusion 31 has a first inclined portion 32 located on the lower side (the ring portion 30 side) and a second inclined portion 33 located on the upper side (opposite side of the annular portion 30) on the inner peripheral surface 34. And have. Further, the protrusion 31 may have a flat portion 36 along the axial direction of the tubular portion 29 between the first inclined portion 32 and the second inclined portion 33.
  • the sealing body 17 has a top surface 39 and a side surface 41 on the flange portion, and a corner portion 40 having an R shape is interposed between the top surface 39 and the side surface 41 of the flange portion.
  • the shapes shown in the drawings are merely examples. Further, the corner portion 40 may be linear.
  • the gasket 28 is attached so that the annular portion 30 abuts on the bottom of the sealing body 17 and the protrusion 31 abuts on the corner portion 40.
  • the first inclined portion 32 is located below the top surface 39 of the flange portion of the sealing body 17 when the gasket 28 is attached to the sealing body 17 so that the sealing body 17 is arranged on the annular portion 30. It is formed like this.
  • the first inclined portion 32 is located below the top surface 39 of the flange portion of the sealing body 17, so that when the caulking portion 42 is formed, the protrusion 31 is the top surface 39 of the flange portion of the sealing body 17. It is less likely that a gap will be formed between the gasket 28 and the sealing body 17.
  • the length between the first inclined portion 32 and the annular portion 30 on the inner peripheral surface 34 of the gasket 28 is the length of the side surface 41 of the sealing body 17 (the bottom surface and the corner portion 40 of the sealing body 17). It is formed shorter than the length between).
  • the first inclined portion 32 is formed so as to be located below the top surface 39 of the flange portion of the sealing body 17. As a result, when the gasket 28 is attached to the sealing body 17, the first inclined portion 32 comes into contact with the corner portion 40 without exceeding the top surface 39 of the flange portion. This makes it possible to prevent the sealing body 17 from coming off the gasket 28 before the caulking portion 42 is formed.
  • the flat portion 36 exists between the first inclined portion 32 and the second inclined portion 33 by the length L along the axial direction of the tubular portion 29. Providing the flat portion 36 also has the effect of making it difficult for the portion of the gasket 28 that comes into contact with the corner portion 40 to flow toward the top surface 39 of the flange portion of the sealing body 17 when the caulking portion 42 is formed. However, in the present disclosure, the flat portion 36 is not essential.
  • the angle ⁇ 1 formed by the portion of the inner peripheral surface 34 of the first inclined portion 32 and the tubular portion 29 adjacent to the first inclined portion 32 (hereinafter referred to as the angle ⁇ 1 of the first inclined portion 32).
  • the angle ⁇ 1 of the first inclined portion 32 By increasing the size), the amount of gap between the gasket 28 and the outer can 16 when forming the caulked portion 42 can be reduced.
  • the reason for this is that the first inclined portion 32 abuts on the corner portion 40 of the sealing body 17 to form the caulking portion 42, and the portion abutting on the corner portion 40 of the gasket 28 is the portion of the sealing body 17. This is because it has the effect of preventing the flange portion from riding on the top surface 39.
  • the angle ⁇ 1 of the first inclined portion 32 is formed to be 130 ° or more.
  • the upper limit of the angle ⁇ 1 of the first inclined portion 32 is set from the viewpoint of preventing the sealing body 17 from coming off.
  • the angle ⁇ 1 of the first inclined portion 32 is 175 ° or less, when the gasket 28 is attached to the sealing body 17, the first inclined portion 32 comes into contact with the corner portion 40 of the sealing body 17 to prevent it from coming off. It is possible. Therefore, by forming the angle ⁇ 1 of the first inclined portion in the range of 130 ° or more and 175 ° or less, the gap amount of the caulked portion 42 can be reduced as compared with the case of the conventional gasket.
  • the angle ⁇ 1 of the first inclined portion 32 in the range of 150 ° or more and 170 ° or less.
  • the second inclined portion 33 is formed above the first inclined portion 32 (if a flat portion 36 is provided, the second inclined portion 33 is further above the flat portion 36).
  • the angle ⁇ 2 formed by the portion of the inner peripheral surface 34 of the second inclined portion 33 and the tubular portion 29 adjacent to the second inclined portion 33 is, for example, 150 °.
  • the first inclined portion 32 and the second inclined portion 33 do not have to be formed on a flat surface, but may be formed on a curved surface.
  • the angle ⁇ 1 of the first inclined portion 32 is the end on the root side of the inner peripheral surface 34 of the first inclined portion 32 and the other end on the inner diameter side of the first inclined portion 32. It is defined as the angle formed by the connected straight line and the inner peripheral surface 34, which is larger than 90 °.
  • the angle ⁇ 2 of the second inclined portion 33 is also defined in the same manner.
  • the first inclined portion 32 is located below the top surface 39 of the flange portion of the sealing body 17 before the caulking portion 42 is formed.
  • the protrusion 31 is less likely to ride on the top surface 39 of the flange portion of the sealing body 17, and is less likely to be pushed out inward in the radial direction of the sealing body 17.
  • the flat portion 36 when the caulking portion 42 is formed, the first inclined portion 32 and the flat portion 36 come into contact with each other along the corner portion 40 of the sealing body 17. As a result, the protrusion 31 is less likely to be pushed inward in the radial direction of the sealing body 17.
  • the gasket 28 of the present embodiment has an effect that a gap is unlikely to occur between the gasket 28 and the outer can 16 when the caulked portion 42 is formed, as shown in FIG.
  • the protrusion 31 abuts on the corner portion 40 of the sealing body 17 and the protrusion 31 It is pushed up from the corner 40 toward the outer can 16 by the thickness. This has the effect of further suppressing the generation of gaps.
  • the gasket 28 of the present embodiment it is possible to realize a highly airtight cylindrical battery 10 in which a gap between the outer can 16 and the gasket 28 is unlikely to occur.
  • the method for manufacturing the cylindrical battery 10 using the gasket 28 of the present embodiment described above is as follows. First, the gasket 28 is attached to the sealing body 17 so that the sealing body 17 is arranged on the annular portion 30. At this time, the first inclined portion 32 is arranged at a position not exceeding the top surface 39 of the flange portion of the sealing body 17. Secondly, in the bottomed cylindrical outer can 16, the sealing body 17 having the gasket 28 mounted is arranged on the grooved portion 22 formed by the side surface in the vicinity of the opening projecting inward. Third, the edge of the opening of the outer can 16 is bent inward to form the caulked portion 42 so that the gasket 28 is compressed by the outer can 16 and the sealing body 17. From the above, the cylindrical battery 10 is manufactured.
  • a gap between the outer can and the gasket is less likely to occur in the crimped portion. Therefore, it is possible to manufacture a cylindrical battery having a high degree of airtightness.
  • LiNi 0.8 Co 0.15 Al 0.05 O 2 was used as the positive electrode active material.
  • a positive electrode mixture slurry was prepared by mixing 100 parts by mass of a positive electrode active material, 1.7 parts by mass of polyvinylidene fluoride as a binder, and 2.5 parts by mass of acetylene black as a conductive agent with a dispersion medium.
  • the positive electrode mixture slurry is applied to both sides of a positive electrode current collector made of aluminum foil except for the connection portion of the positive electrode tab, dried, and then the coating film is compressed to a predetermined thickness to obtain a positive electrode plate. Obtained.
  • This positive electrode plate was cut to a predetermined size, and an Al positive electrode tab was connected to the exposed portion of the current collector by ultrasonic welding.
  • Graphite was used as the negative electrode active material. 100 parts by mass of the negative electrode active material, 0.6 parts by mass of polyvinylidene fluoride as a binder, parts by mass of carboxymethyl cellulose as a thickener, and an appropriate amount of water are stirred by a double-arm kneader and the negative electrode is used. A mixture slurry was prepared. This negative electrode mixture slurry is applied to both sides of a negative electrode current collector made of copper foil except for the connection portion of the negative electrode tab, dried, and then the coating film is compressed to a predetermined thickness to form a negative electrode plate. Obtained. This negative electrode plate was cut to a predetermined size, and a negative electrode tab made of a Ni—Cu—Ni clad material was connected to the exposed portion of the current collector by ultrasonic welding.
  • Lithium hexafluorophosphate (LiPF 6 ) as an electrolyte is dissolved in a mixed solvent of ethylene carbonate (EC), diethyl carbonate (DEC), and ethylmethyl carbonate (EMC) so as to be 1.0 mol / L, and is non-water.
  • An electrolytic solution was prepared.
  • gasket 43 shown in FIG. 5 was prepared.
  • the sealing body 17 when the sealing body 17 is arranged on the annular portion 30 of the gasket 43, a part of the lower inclined portion of the protrusion 37 is part of the sealing body 17.
  • the protrusion 37 was formed so as to exceed the top surface 39 of the flange portion.
  • the upper and lower inclined portions were directly connected to the protrusion 37 to form the apex 38.
  • a predetermined amount of the prepared non-aqueous electrolytic solution was injected into the outer can containing the electrode body.
  • the positive electrode tab connected to the positive electrode plate is connected to the sealing body by welding, and while folding the positive electrode tab, the sealing body with the gasket is placed on the grooved portion of the outer can, and the edge of the opening of the outer can is placed.
  • a cylindrical battery was manufactured by bending the portion inward to form a caulked portion so that the gasket was compressed by the outer can and the sealing body.
  • the gap amount of the crimped portion of Examples 1 to 4 is clearly smaller than the gap amount of the crimped portion of the comparative example. Therefore, it can be seen that the gasket of the example has an effect of reducing the gap amount of the caulked portion as compared with the gasket of the comparative example. Further, in the gasket of the embodiment, it can be confirmed that the gap amount is reduced by increasing the angle ⁇ 1 of the first inclined portion. It can also be confirmed that the amount of gap is reduced by increasing the length L of the straight line of the flat portion.
  • the gap amount of the caulked portion can be made smaller than that of the gasket of the conventional example.
  • the angle ⁇ 1 of the first inclined portion is 150 ° or more and 170 ° or less.
  • the provision of a flat portion reduces the amount of gap and improves the airtightness. Further, by increasing the length L of the straight line of the flat portion, the amount of gap is reduced and the airtightness is improved.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
PCT/JP2021/038932 2020-10-28 2021-10-21 円筒形電池用ガスケット、これを用いた円筒形電池の製造方法及び円筒形電池 Ceased WO2022091934A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US18/032,606 US20230395909A1 (en) 2020-10-28 2021-10-21 Cylindrical battery gasket, method for producing cylindrical battery using same, and cylindrical battery
JP2022559072A JP7783188B2 (ja) 2020-10-28 2021-10-21 円筒形電池用ガスケット、これを用いた円筒形電池の製造方法及び円筒形電池
CN202180070721.8A CN116406485B (zh) 2020-10-28 2021-10-21 圆筒形电池用衬垫、圆筒形电池以及其制造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020180061 2020-10-28
JP2020-180061 2020-10-28

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WO2022091934A1 true WO2022091934A1 (ja) 2022-05-05

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PCT/JP2021/038932 Ceased WO2022091934A1 (ja) 2020-10-28 2021-10-21 円筒形電池用ガスケット、これを用いた円筒形電池の製造方法及び円筒形電池

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US (1) US20230395909A1 (https=)
JP (1) JP7783188B2 (https=)
CN (1) CN116406485B (https=)
WO (1) WO2022091934A1 (https=)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024053272A1 (ja) * 2022-09-05 2024-03-14 Fdk株式会社 円筒形電池用ガスケットおよび当該ガスケットを備える円筒形電池
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WO2024185394A1 (ja) * 2023-03-08 2024-09-12 パナソニックエナジー株式会社 ガスケット、円筒形電池、及び円筒形電池の製造方法

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JP2024533755A (ja) * 2022-06-02 2024-09-12 エルジー エナジー ソリューション リミテッド 二次電池
JP7750496B2 (ja) 2022-06-02 2025-10-07 エルジー エナジー ソリューション リミテッド 二次電池
WO2024053272A1 (ja) * 2022-09-05 2024-03-14 Fdk株式会社 円筒形電池用ガスケットおよび当該ガスケットを備える円筒形電池
WO2024181422A1 (ja) * 2023-02-28 2024-09-06 パナソニックＩｐマネジメント株式会社 蓄電装置
WO2024185394A1 (ja) * 2023-03-08 2024-09-12 パナソニックエナジー株式会社 ガスケット、円筒形電池、及び円筒形電池の製造方法

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