WO2016072438A1 - Cellule plate et élément d'assemblage de celle-ci - Google Patents

Cellule plate et élément d'assemblage de celle-ci Download PDF

Info

Publication number
WO2016072438A1
WO2016072438A1 PCT/JP2015/081117 JP2015081117W WO2016072438A1 WO 2016072438 A1 WO2016072438 A1 WO 2016072438A1 JP 2015081117 W JP2015081117 W JP 2015081117W WO 2016072438 A1 WO2016072438 A1 WO 2016072438A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealing
peripheral wall
gasket
flat battery
sealed
Prior art date
Application number
PCT/JP2015/081117
Other languages
English (en)
Japanese (ja)
Inventor
慎也 小松
Original Assignee
日立マクセル株式会社
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 日立マクセル株式会社 filed Critical 日立マクセル株式会社
Priority to JP2016557788A priority Critical patent/JP6726622B2/ja
Publication of WO2016072438A1 publication Critical patent/WO2016072438A1/fr

Links

Images

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
    • H01M50/186—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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a flat battery and a member for assembling the battery.
  • an outer can is provided with a bottomed cylindrical outer can and a sealing can disposed inside the outer can so as to maintain airtightness inside the battery and to ensure electrical insulation between the outer can and the sealing can.
  • Japanese Patent Application Laid-Open No. 2012-190758 discloses a flat battery in which a resin gasket is arranged between a sealing can and a sealing can.
  • Japanese Patent Application Laid-Open No. 2012-190758 includes an outer can, a sealing can, and a gasket integrally formed on a peripheral wall portion of the sealing can, and the gasket has a gasket tip portion that functions as a seal between the sealing can and the outer can And a gasket outer portion that presses the gasket tip against the bottom of the outer can when the outer can is fitted to the sealing can, and the opening end of the peripheral wall portion of the outer can is fitted to the outer gasket portion.
  • a flat battery is disclosed in which a protrusion is provided at a position.
  • the protruding portion is formed such that the side surface located on the base end side of the sealing can is located inside the sealing can from the outer surface of the enlarged diameter portion of the sealing can. Has been. Therefore, when the opening end of the peripheral wall portion of the outer can is caulked against the stepped portion of the sealing can, the force pressing the protruding portion is transmitted to the gasket tip through the gasket outer portion, and the gasket tip is transferred to the outer can. Can be pressed more strongly against the bottom of the.
  • a part of the gasket outer portion formed to cover the outer surface of the stepped portion of the sealing can (hereinafter referred to as the following) X portion)) exists.
  • This portion X is in direct contact with the protruding portion of the outer side of the gasket and directly applies the pressing force applied to the protruding portion of the outer side of the gasket when the open end of the peripheral wall of the outer can is caulked to the stepped portion of the sealing can. It has become a part to receive.
  • the flat battery disclosed in Japanese Patent Application Laid-Open No. 2012-190758 has a structure in which the protruding portion of the gasket outer portion does not directly contact the outer surface of the step portion of the sealed can due to the presence of the X portion. For this reason, a part of the pressing force applied to the protruding portion on the outer side of the gasket is absorbed and dispersed in the X portion, and all of the pressing force is not sufficiently transmitted to the step portion of the sealing can. As a result, the pressing force of the gasket tip against the bottom of the outer can is reduced, and there is a problem that the airtightness inside the battery is lowered.
  • An object of the present invention is to provide a flat battery in which the airtightness inside the battery is further improved by enhancing the sealing performance of the gasket.
  • Another object of the present invention is to provide a member for assembling a flat battery in which the airtightness inside the battery is further improved by enhancing the sealing performance of the gasket.
  • the flat battery is a flat battery that is provided with an outer can, a sealing can, and a gasket, and the opening end of the peripheral wall of the outer can is caulked and sealed.
  • the outer can has a cylindrical peripheral wall.
  • the sealing can is arranged inside the peripheral wall of the outer can and has a cylindrical peripheral wall that is smaller than the outer diameter of the outer can.
  • the gasket is disposed between the peripheral wall of the outer can and the peripheral wall of the sealing can.
  • the peripheral wall of the sealing can includes a base end portion on the bottom side, an enlarged diameter portion on the opening end side formed larger than the outer diameter of the base end portion, and a step portion between the base end portion and the enlarged diameter portion. And have.
  • the gasket covers the outer surface of the enlarged portion of the sealed can, and is disposed between the outer cylindrical portion in contact with the stepped portion of the sealed can, the enlarged portion of the sealed can, and the bottom of the outer can, and the outer can And a projecting portion in contact with the bottom portion.
  • a rising portion that protrudes from the sealing can side in the radial direction of the sealing can is formed on the outer can side of the portion of the outer cylinder portion that contacts the stepped portion of the sealing can.
  • the assembly member for the flat battery is an assembly member for the flat battery, and includes a sealing can and a gasket.
  • the sealing can has a cylindrical peripheral wall.
  • the gasket has a substantially cylindrical shape integrated with the sealing can.
  • the peripheral wall of the sealing can includes a base end portion on the bottom side, an enlarged diameter portion on the opening end side formed larger than the outer diameter of the base end portion, and a step portion between the base end portion and the enlarged diameter portion.
  • the gasket includes an outer cylindrical portion that covers the outer surface of the enlarged diameter portion of the sealed can, and an outer cylindrical portion that contacts the stepped portion of the sealed can, and a projecting portion that is connected to the outer cylindrical portion and covers the opening end of the enlarged diameter portion.
  • a rising portion is formed that protrudes in the cylinder axis direction of the sealing can from the sealing can side.
  • the width A of the rising portion is smaller than the width B of the outer cylinder portion that covers the outer surface of the enlarged diameter portion.
  • the height h of the rising portion and the width t on the inner side of the rising portion of the outer cylinder portion satisfy h> t.
  • FIG. 1 It is sectional drawing which shows schematic structure of the flat battery by embodiment of this invention. It is a partial expanded sectional view which expands and shows the structure of the electrode body in a flat battery in a cross section. It is a partial expanded sectional view which expands and shows the step part vicinity of a sealing can. It is a figure which shows a mode when molding a gasket in a sealing can. It is an expanded sectional view which expands and shows a gasket. It is sectional drawing in the state before and behind crimping the surrounding wall of a sealing can on the surrounding wall of an exterior can.
  • a flat battery 1 mainly includes an outer can 10, a sealing can 20, a gasket 30, and an electrode body 40.
  • the flat battery 1 is arranged on the inner side of the outer can 10 having a cylindrical peripheral wall and the outer wall of the outer can 10, and from the outer diameter of the outer can 10.
  • the sealed can 20 having a small cylindrical peripheral wall, the gasket 30 disposed between the outer can 10 and the sealed can 20, and the space formed between the outer can 10 and the sealed can 20 are accommodated.
  • An electrode body 40 is provided.
  • FIG. 1 shows a state in which the opening end of the peripheral wall 12 of the outer can 10 is caulked to the peripheral wall 22 of the sealing can 20.
  • the flat battery 1 is formed into a flat coin shape by combining the outer can 10 and the sealing can 20 together.
  • a nonaqueous electrolytic solution (not shown) is also enclosed.
  • the outer can 10 is a positive electrode can and the sealed can 20 is a negative electrode can.
  • the outer can 10 is made of a metal material such as stainless steel and is formed into a bottomed cylindrical shape by press molding.
  • the outer can 10 includes a circular bottom portion 11 and a cylindrical peripheral wall 12 formed continuously with the bottom portion 11 on the outer periphery thereof.
  • the bottom portion 11 includes a circular bottom portion 11 a on which the electrode body 40 is disposed, and a cylindrical bottom portion 11 b in a step portion formed on the outer peripheral side of the bottom portion 11 a.
  • the peripheral wall 12 extends in the vertical direction (the same direction as the one-dot chain line P in FIG. 1) from the outer peripheral end of the bottom portion 11 b in a longitudinal sectional view.
  • the symbol P in FIG. 1 indicates the cylinder axis of the outer can 10 and the sealing can 20. That is, the peripheral wall 12 extends upward in the cylinder axis P of the outer can 10.
  • the sealing can 20 is made of a metal material such as stainless steel like the outer can 10 and is formed into a bottomed cylindrical shape by press molding.
  • the sealing can 20 includes a substantially cylindrical peripheral wall 22 having an outer shape smaller than the peripheral wall 12 of the outer can 10 and a circular flat portion 21 that closes one of the openings.
  • the peripheral wall 22 extends downward from the outer peripheral end of the flat portion 21 and is formed as a straight can that does not have a folded portion at the distal end portion of the peripheral wall 22.
  • the peripheral wall 22 of the sealing can 20 has a base end portion 22a, an enlarged diameter portion 22b, and a step portion 22c.
  • the base end portion 22 a extends downward from the outer peripheral end of the flat portion 21.
  • the enlarged diameter portion 22 b is formed larger than the outer diameter of the base end portion 22 a and has a shape that widens the open end of the peripheral wall 22 in a step shape.
  • the step portion 22c has a shape that widens the opening end of the peripheral wall 22 in a step shape.
  • the base end portion 22a extends from the step portion 22c and extends to the opposite side of the bottom portion 11b of the outer can 10.
  • the step portion 22c is disposed between the base end portion 22a and the enlarged diameter portion 22b, and is connected to the proximal end portion 22a and the enlarged diameter portion 22b.
  • the gasket 30 is substantially cylindrical and is disposed between the peripheral wall 12 of the outer can 10 and the peripheral wall 22 of the sealing can 20. Ensure insulation.
  • the gasket 30 covers the inner surface and the outer surface of the peripheral wall 22 of the sealing can 20, is in contact with the inner surface of the peripheral wall 12 of the outer can 10, and protrudes downward from the opening end of the peripheral wall 22 to the cylindrical axis P of the sealing can 20. And touches the bottom 11b of the outer can 10.
  • the gasket 30 is made of polypropylene (PP).
  • PP polypropylene
  • the material of the gasket 30 is not limited to polypropylene, and may be a resin composition containing an olefin elastomer in polyphenylene sulfide (PPS), polytetrafluoroethylene (PFA), a polyamide resin, or the like.
  • the electrode body 40 includes a plurality of positive electrodes 41 and a plurality of negative electrodes 46.
  • the electrode body 40 is formed by alternately stacking a plurality of positive electrodes 41 and a plurality of negative electrodes 46 in a space formed between the bottom portion 11 a of the outer can 10 and the flat portion 21 of the sealing can 20.
  • the electrode body 40 has a substantially cylindrical shape as a whole as such a laminated structure.
  • the electrode body 40 is configured by arranging a plurality of positive electrodes 41 and a plurality of negative electrodes 46 so that the polarities located at both ends in the direction of the cylinder axis P are all negative electrodes. That is, the negative electrodes 46 are respectively disposed at both ends of the electrode body 40.
  • the plurality of positive electrodes 41 have a substantially disk shape. As shown in FIG. 2, each of the plurality of positive electrodes 41 has a positive electrode active material layer 42 containing a positive electrode active material such as lithium cobaltate disposed on both surfaces of a positive electrode current collector 43 made of a metal foil such as aluminum. Is. As shown in FIG. 2, the plurality of positive electrodes 41 are respectively accommodated in a plurality of separators 44 having a bag shape.
  • the separator 44 is a bag-like member formed in a circular shape in plan view, and is formed in a size that can accommodate the substantially disc-shaped positive electrode 41.
  • the separator 44 is made of a polyethylene material having excellent insulating properties.
  • the separator 44 is made of a microporous thin film. Thereby, lithium ions can pass through the separator 44.
  • the separator 44 is formed by wrapping the positive electrode 41 with a single sheet of a rectangular microporous thin film and bonding the sheet material to the overlapping portion by thermal welding or the like.
  • the positive electrode current collector 43 of the positive electrode 41 is integrally connected to a conductive positive electrode lead 51 that extends toward the right side with respect to the cylinder axis P, as shown in FIGS.
  • the positive electrode lead 51 is partially covered with a separator 44 in the vicinity where it is connected to the positive electrode current collector 43.
  • Each of the plurality of positive electrode leads 51 is exposed to the outside of the separator 44 from a position connected to the positive electrode current collector 43 as shown in FIG.
  • a positive electrode current collector 43 without the positive electrode active material layer 42 is disposed between the insulating sheet 49 and the bottom 11a of the outer can 10. That is, the positive electrode current collector 43 is in electrical contact with the bottom 11 a of the outer can 10.
  • the plurality of negative electrodes 46 have a substantially disk shape. As shown in FIG. 2, each of the negative electrodes 46 has a negative electrode active material layer 47 containing a negative electrode active material such as graphite disposed on both surfaces of a negative electrode current collector 48 made of a metal foil such as copper.
  • the negative electrode active material layer 47 is disposed only on one side of the negative electrode current collector 48 that is positioned to face the positive electrode 41.
  • the negative electrode active material layer 47 is arranged only on one side of the negative electrode current collector 48. That is, the negative electrode 46 arranged on the outer can 10 side is, as shown in FIG. 2, the upper surface of the insulating sheet 49 positioned above the positive electrode 41 (positive electrode current collector 43) arranged on the bottom 11 a of the outer can 10. On the other hand, the negative electrode active material layer 47 is not arranged, and the negative electrode current collector 48 is arranged in such a manner that it directly contacts.
  • the negative electrode active material layer 47 is disposed only on one surface of the negative electrode current collector 48 for the negative electrode 46 disposed on the sealing can 20 side. That is, the negative electrode 46 disposed on the sealing can 20 side is disposed in such a manner that the negative electrode current collector 48 directly contacts the flat portion 21 of the sealing can 20 as shown in FIG.
  • the negative electrode current collector 48 is integrally connected to a conductive negative electrode lead 52 extending toward the left side with respect to the cylinder axis P, as shown in FIGS. 1 and 2.
  • each of the negative electrode leads 52 converges at a position on the left side with respect to the cylinder axis P from a position connected to the negative electrode current collector 48 of the negative electrode 46.
  • the tip ends of the plurality of positive electrode leads 51 are overlapped in the thickness direction and connected by ultrasonic welding or the like. Accordingly, the plurality of positive electrodes 41 are electrically connected to each other via the plurality of positive electrode leads 51, and each positive electrode 41 and the outer can 10 are electrically connected.
  • the plurality of negative electrode leads 52 are also stacked in the thickness direction in a state where the plurality of positive electrodes 41 and the negative electrodes 46 are stacked, and are connected to each other by ultrasonic welding or the like. Accordingly, the plurality of negative electrodes 46 are electrically connected to each other via the plurality of negative electrode leads 52, and the respective negative electrodes 46 and the sealing can 20 are electrically connected.
  • the gasket 30 is disposed between the outer cylindrical portion 31 and the inner cylindrical portion 32 that cover the peripheral wall 22 of the sealing can 20, and the peripheral wall 22 of the sealing can 20 and the bottom portion 11 b of the outer can 10. And a protruding portion 33 in contact with the bottom portion 11b of the outer can 10.
  • the outer cylinder portion 31 covers the outer surface of the peripheral wall 22 of the sealing can 20, contacts the base end portion 22 a and the step portion 22 c of the sealing can 22, and protrudes to the outside from the opening end of the peripheral wall 12 of the outer can 10. Further, the outer cylinder portion 31 is connected to the protruding portion 33 in the vicinity of the opening end of the peripheral wall 22 of the sealing can 20.
  • the outer cylinder part 31 covers the outer surface from the base end part 22a which comprises the surrounding wall 22 of the sealing can 20 to the opening end of the enlarged diameter part 22b, and the surrounding wall 12 of the exterior can 10 and the sealing can The space between the 20 peripheral walls 22 is maintained in a sealed state.
  • the outer cylinder portion 31 extends in the radial direction of the sealing can 20 from the base end portion 22 a to a portion extending from the peripheral wall 22 of the sealing can 20 to the peripheral wall 12 side of the outer can 10.
  • a boundary L More specifically, as shown in FIG. 3, the boundary portion L represents a contact portion between a portion of the outer cylinder portion 31 that covers the outer surface of the enlarged diameter portion 22 b and the curved portion 31 a.
  • the outer cylinder part 31 is provided with the curved part 31a.
  • the curved portion 31 a is in contact with the outer surface from the base end portion 22 a constituting the peripheral wall 22 of the sealing can 20 to the stepped portion 22 c, and the base end portion 22 a of the sealing can 20.
  • the space formed between the step part 22c and the curved part in the opening end side of the surrounding wall 12 of the armored can 10 is sealed.
  • the flat battery 1 is maintained in a state in which the space between the peripheral wall 12 of the outer can 10 and the peripheral wall 22 of the sealing can 20 is totally sealed, the sealing performance of the gasket 30 is increased. The airtightness inside the battery is further improved.
  • the end portion of the curved portion 31 a of the outer cylinder portion 31 protrudes to the outside from the open end of the peripheral wall 12 of the outer can 10. More specifically, as shown in FIG. 3, the bending portion 31 a is sandwiched between the base end portion 22 a of the sealing can 20 and the opening end of the peripheral wall 12 of the outer can 10. In particular, the distal end portion of the curved portion 31 a is in a state of protruding outward from between the opening end of the peripheral wall 12 of the outer can 10 and the base end portion 22 a of the sealing can 20.
  • the gasket 30 is hermetically sealed, including between the base end portion 22 a of the sealing can 20 and the opening end of the peripheral wall 12 of the outer can 10, and therefore, between the peripheral wall 12 of the outer can 10 and the peripheral wall 22 of the sealing can 20.
  • the sealing property in the space can be further improved.
  • the bending portion 31a is sandwiched between the base end portion 22a of the sealing can 20 and the opening end of the peripheral wall 12 of the outer can 10, and the end portion of the bending portion 31a protrudes to the outside, the sealing can The contact between the base end portion 22a of the 20 and the opening end of the peripheral wall 12 of the outer can 10 can be prevented, and the electrically insulated state between the outer can 10 and the sealing can 20 can be maintained.
  • the inner cylinder part 32 covers the inner surface of the peripheral wall 22 of the sealing can 20. More specifically, as shown in FIG. 1, the inner cylindrical portion 32 extends from the inner surface of the step portion 22 c of the peripheral wall 22 to the opening end of the peripheral wall 22 of the sealing can 20, and the inner surface of the peripheral wall 22 of the sealing can 20. Is formed in a substantially cylindrical shape. The inner peripheral surface of the inner cylinder portion 32 is formed so as to be substantially flush with the inner peripheral surface of the base end portion 22 a of the peripheral wall 22. The inner cylinder part 32 is connected to the protruding part 33 in the vicinity of the opening end of the peripheral wall 22 of the sealing can 20.
  • the protruding portion 33 is in contact with the bottom 11b of the outer can 10.
  • the peripheral wall 12 of the outer can 10 is caulked to the peripheral wall 22 of the sealing can 20, the distal end portion of the projecting portion 33 is pressed against the bottom 11 b of the outer can 10, and the peripheral wall 12 of the outer can 10 and the peripheral wall 22 of the sealing can 20 The space between is sealed.
  • the inner cylinder portion 32 and the protruding portion 33 are sandwiched between the step portion 22c of the sealing can 20 and the bottom portion 11b of the outer can 10 by the pressing force applied to the peripheral wall 12 of the outer can 10 when caulking. And as shown in FIG. 1, since the inner cylinder part 32 and the protrusion part 33 are pressed more strongly with respect to the bottom part 11b of the exterior can 10, the inner surface becomes concave shape toward the surrounding wall 12 of the exterior can 10. ing. For this reason, the space between the projecting portion 33 and the bottom portion 11b of the outer can 10 is more sealed.
  • the flat battery 1 according to the embodiment of the present invention is obtained through the following manufacturing process.
  • the outer can 10 and the sealed can 20 are manufactured by press molding.
  • the electrode body 40 is formed by alternately laminating a plurality of plate-like positive electrodes 41 and a plurality of plate-like negative electrodes 46 covered with the separators 44 in the thickness direction. Since the electrode body 40 is manufactured by a method similar to the conventional method, the detailed manufacturing method will not be described.
  • a fixed mold 61, a movable mold 62, and a piston movable mold 63 having a ring-shaped cross section are arranged outside the sealing can 20, and the pins 64 are placed inside the sealing can 20.
  • a molding die for molding the gasket 30, that is, a space 60 for forming the gasket 30 is formed around the peripheral wall 22 of the sealing can 20 by the molding dies 61, 62, 63 and the pins 64.
  • the fixed mold 61 has an inlet (not shown) for injecting a resin material into the space 60 from the outside.
  • the molten resin material is injected into the space 60 from the injection port, and the space 60 is filled with the resin material.
  • the movable mold 62 is removed. Then, by moving the piston movable mold 63 in the axial direction of the pin 64 (in the direction of the white arrow in FIG. 4), the sealing can 20 in which the gasket 30 is molded is detached from the pin 64 and the fixed mold 61.
  • the fixed mold 61 is formed in a tapered shape such that the inner diameter gradually increases toward the step portion 22c of the peripheral wall 22 of the sealing can 20 at a portion where the outer peripheral surface of the cylindrical gasket 30 is formed. With this shape, the sealing can 20 can be easily detached from the fixed mold 61 when the gasket 30 is pushed by the piston movable mold 63.
  • the movable mold 62 includes a convex portion 62a and a concave portion 62b as shown in FIG.
  • the convex part 62a is in contact with the base end part 22a and the step part 22c of the sealing can 20 during molding.
  • the concave portion 62b is formed at a position adjacent to the outside of the convex portion 62a, and is a portion where a resin material melted from the injection port is buried as a part of the space 60.
  • the outer surface of the stepped portion 22 c and the outer surface of the base end portion 22 a are not covered with the gasket 30 and exposed to the outside by the convex portion 62 a as shown in FIG. 5. It has become. Note that the outer surface of the stepped portion 22c may be in a state that is not covered by the gasket 30 at all.
  • the gasket 30 after molding rises above the step 22 c of the sealing can 20 as a part of the outer cylinder portion 31 at the position of the concave portion 62 b of the movable mold 62.
  • a rising portion Z is formed.
  • the outer surface of the rising portion Z is connected to the outer surface of the outer cylinder portion 31 other than the rising portion Z.
  • the rising portion Z is formed so that the lateral width (dimension A) is smaller than the lateral width (dimension B) of the portion covering the enlarged diameter portion 22 b of the sealing can 20.
  • the height of the rising portion Z is h and the width on the inner side of the rising portion Z of the outer cylinder portion 31 is t
  • the height h and the width t satisfy h> t.
  • the height h and the dimension A satisfy h> A.
  • the sealing performance of the gasket is improved, and the airtightness inside the battery can be improved.
  • the rising portion Z of the gasket 30 is in contact with at least a part of the base end portion 22a of the peripheral wall 22 of the sealing can 20. Good. This is because the space between the peripheral wall 12 of the outer can 10 and the peripheral wall 22 of the sealing can 20 is sealed by such a configuration, and the airtightness inside the battery can be improved.
  • the electrode body 40 is disposed in the outer can 10 together with the insulating sheet 49 and the like, and a non-aqueous electrolyte is injected.
  • the nonaqueous electrolytic solution can be obtained, for example, by dissolving LiPF 6 in a solvent obtained by mixing ethylene carbonate and methyl ethyl carbonate.
  • the outer can 10 and the sealing can 20 in which the gasket 30 is molded are combined to obtain the state shown in the upper diagram of FIG. From this state, as shown in the lower diagram of FIG. 6, the open end of the peripheral wall 12 of the outer can 10 is caulked in a direction toward the peripheral wall 22 of the sealing can 20.
  • the outer cylindrical portion 31 of the gasket 30 has a rising portion Z in a stage before the peripheral wall 12 of the outer can 10 is caulked to the peripheral wall 22 of the sealing can 20.
  • the rising portion Z is formed such that the width dimension (dimension A shown in FIG. 5) is smaller than the width dimension (dimension B shown in FIG. 5) of the portion covering the outer surface of the enlarged diameter portion 22b of the sealed can 20 and the outer can. 10 is extended to the opposite side to the bottom 11b.
  • the rising portion Z is bent toward the peripheral wall 22 of the sealing can 20 while the peripheral wall 12 of the outer can 10 is bent.
  • the rising portion Z is a curved portion 31 a that is not covered by the gasket 30 and exposed to the outside, and the proximal end portion 22 a of the sealing can 20. It contacts the outer surface of the step 22c.
  • the pressing force applied to the peripheral wall 12 of the outer can 10 is not absorbed by the other portions of the gasket 30, but is directly transmitted to the stepped portion 22 c of the sealing can 20 via the rising portion Z. Press down.
  • the peripheral wall 22 of the sealing can 20 is pushed down in the direction of the bottom 11 b of the outer can 10, whereby the protruding portion 33 of the gasket 30 is pressed against the bottom 11 b of the outer can 10.
  • the lateral width of the rising portion Z (dimension A shown in FIG. 5) is an outer portion located between the peripheral wall 12 of the outer can 10 and the enlarged diameter portion 22 b of the sealed can 20. It is formed so as to be smaller than the lateral width of the cylindrical portion 31 (dimension B shown in FIG. 5).
  • the boundary portion L representing the contact portion between the curved portion 31 a and the portion covering the outer surface of the enlarged diameter portion 22 b in the outer cylindrical portion 31 is in the radial direction of the sealing can 20.
  • the base end portion 22a extends from the outer surface of the enlarged diameter portion 22b of the sealing can 20 to a portion extending to the peripheral wall 12 side of the outer can 10.
  • the rising portion Z of the gasket 30 comes into contact with the proximal end portion 22 a of the sealing can 20, and the sealing can 20 Is pushed in the direction of the bottom 11b of the outer can 10.
  • the protruding portion 33 of the gasket 30 is strongly pressed against the bottom portion 11b of the outer can 10 and the sealing performance of the gasket 30 is enhanced. Therefore, the airtightness inside the battery can be further improved.
  • Dimension C1 and C2 shown in FIG. 6 indicate the distance between the bottom 11b of the outer can 10 and the opening end of the peripheral wall 22 of the sealing can 20.
  • the dimension C2 is smaller than the dimension C1 before and after the peripheral wall 12 of the outer can 10 is caulked to the peripheral wall 22 of the sealing can 20. That is, by caulking the peripheral wall 12 of the outer can 10 to the peripheral wall 22 of the sealing can 20, the distance between the bottom portion 11 b of the outer can 10 and the opening end of the peripheral wall 22 of the sealing can 20 is reduced, and the protruding portion of the gasket 30. 33 is strongly pressed against the bottom 11b of the outer can 10.
  • the pressing force applied to the peripheral wall 12 of the outer can 10 also propagates to the inner cylinder portion 32 that is in contact with the inner surface of the step portion 22c of the sealing can 20.
  • the inner cylinder part 32 and the protrusion part 33 of the gasket 30 become concave toward the peripheral wall 12 of the outer can 10 as shown in the lower diagram of FIG. 6.
  • the outer cylinder portion 31 has a terminal portion protruding outward from the opening end of the peripheral wall 12 of the outer can 10.
  • the distal end portion of the curved portion 31a of the outer cylindrical portion 31 is the open end of the peripheral wall 12 of the outer can 10 in a state of being sandwiched between the base end portion 22a of the sealing can 20 and the open end of the peripheral wall 12 of the outer can 10.
  • the base end portion 22a of the sealing can 20 project outside.
  • the open end of the peripheral wall 12 of the outer can 10 is caulked to the peripheral wall 22 of the sealing can 20, and the flat battery 1 combining the outer can 10 and the sealing can 20 is completed as shown in the lower diagram of FIG. 6. .
  • the sealing can 20 in which the gasket 30 is molded on the peripheral wall 22 constitutes “a member for assembling a flat battery” according to the embodiment of the present invention.
  • a flat battery 1 has an outer can 10 having a cylindrical peripheral wall 12 and a cylindrical battery that is disposed inside the peripheral wall 12 of the outer can 10 and is smaller than the outer diameter of the outer can 10.
  • a sealing can 20 having a peripheral wall 22 and a gasket 30 disposed between the peripheral wall 12 of the outer can 10 and the peripheral wall 22 of the sealing can 20 are provided.
  • the peripheral wall 22 of the sealing can 20 includes a step portion 22c that widens its open end in a step shape.
  • the gasket 30 covers the outer surface of the peripheral wall 22 of the sealing can 20, and is disposed between the outer cylinder portion 31 that contacts the step portion 22 c of the sealing can 20, and the peripheral wall 22 of the sealing can 20 and the bottom portion 11 b of the outer can 10.
  • the outer cylindrical portion 31 includes a boundary portion L that extends from the base end portion 22 a to a portion that extends from the peripheral wall 22 of the sealing can 20 toward the peripheral wall 12 in the radial direction of the sealing can 20.
  • the gasket 30 includes an inner cylinder portion 32 that covers the inner surface of the peripheral wall 22 of the sealing can 20.
  • the inner cylindrical portion 32 extends from the protruding portion 33 and contacts the inner surface of the step portion 22 c of the sealing can 20.
  • the inner cylindrical portion 32 and the protruding portion 33 are directed toward the peripheral wall 12 of the outer can 10. It is concave.
  • outer cylinder portion 31 has a terminal portion protruding outward from the open end of the peripheral wall 12 of the outer can 10.
  • the sealing can 20 has a base end portion 22a extending from the step portion 22c and extending to the opposite side of the bottom portion 11b of the outer can 10. Further, before the peripheral wall 12 of the outer can 10 is caulked to the peripheral wall 22 of the sealing can 20, the outer cylinder portion 31 is formed with a width dimension smaller than the width dimension of the portion covering the outer surface of the peripheral wall 22 of the sealing can 20. And it has the standing part Z extended on the opposite side to the bottom part 11b of the armored can 10, and at least one part of the outer surface of the step part 22c and the outer surface of the base end part 22a are exposed.
  • the rising portion Z is not covered with the gasket 30 and is exposed to the outside, and the proximal end portion 22 a of the sealing can 20 is exposed. And in contact with the outer surface of the step 22c. For this reason, the pressing force applied to the peripheral wall 12 of the outer can 10 is not absorbed by the other portions of the gasket 30 and is directly transmitted to the step portion 22c of the sealing can 20 via the rising portion Z. Press down. Thereby, the sealing performance of the gasket 30 increases and the airtightness inside the battery can be further improved.
  • the electrode body 40 is set as the structure which laminated
  • the outer can 10 is a positive electrode can and the sealed can 20 is a negative electrode can.
  • the sealed can 20 may be a positive electrode can and the outer can 10 may be a negative electrode can.
  • the said embodiment it was set as the structure provided with the bottom part 11a which arrange
  • the circular bottom portion 11 without the step portion may be formed, and the electrode body 40 and the gasket 30 may be disposed on the same surface of the bottom portion 11.
  • the outer can 10 and the sealing can 20 are each formed in a bottomed cylindrical shape, and the flat battery 1 is formed in a coin shape.
  • the present invention is not limited thereto, and the flat battery is formed in a polygonal column shape or the like. The shape may be other than a cylindrical shape.
  • the flat battery is a flat battery that is provided with an outer can, a sealing can, and a gasket, and the opening end of the peripheral wall of the outer can is caulked and sealed.
  • the outer can has a cylindrical peripheral wall.
  • the sealing can is arranged inside the peripheral wall of the outer can and has a cylindrical peripheral wall that is smaller than the outer diameter of the outer can.
  • the gasket is disposed between the peripheral wall of the outer can and the peripheral wall of the sealing can.
  • the peripheral wall of the sealing can includes a base end portion on the bottom side, an enlarged diameter portion on the opening end side formed larger than the outer diameter of the base end portion, and a step portion between the base end portion and the enlarged diameter portion. And have.
  • the gasket covers the outer surface of the enlarged portion of the sealed can, and is disposed between the outer cylindrical portion in contact with the stepped portion of the sealed can, the enlarged portion of the sealed can, and the bottom of the outer can, and the outer can And a projecting portion in contact with the bottom portion.
  • a rising portion that protrudes from the sealing can side in the radial direction of the sealing can is formed on the outer can side of the portion of the outer cylinder portion that contacts the stepped portion of the sealing can.
  • the gasket in a state in which the peripheral wall of the outer can is crimped to the peripheral wall of the sealed can, the gasket contacts the stepped portion of the sealed can and pushes the stepped portion of the sealed can toward the bottom of the outer can.
  • the protruding portion of the gasket is strongly pressed against the bottom of the outer can, and the sealing performance of the gasket is enhanced. Therefore, the airtightness inside the battery can be further improved.
  • the gasket further includes an inner cylinder portion covering the inner surface of the enlarged diameter portion of the sealing can.
  • the inner cylinder portion extends from the protruding portion and contacts the inner surface of the step portion of the sealing can.
  • the open end of the peripheral wall of the outer can is caulked so that the inner cylinder portion and the projecting portion are concave toward the peripheral wall of the outer can.
  • the space between the outer can and the sealing can can be more tightly pressed against the bottom of the outer can.
  • the end portion of the rising portion of the outer cylinder portion protrudes to the outside from the opening end of the peripheral wall of the outer can.
  • the assembly member for the flat battery is an assembly member for the flat battery, and includes a sealing can and a gasket.
  • the sealing can has a cylindrical peripheral wall.
  • the gasket has a substantially cylindrical shape integrated with the sealing can.
  • the peripheral wall of the sealing can includes a base end portion on the bottom side, an enlarged diameter portion on the opening end side formed larger than the outer diameter of the base end portion, and a step portion between the base end portion and the enlarged diameter portion.
  • the gasket includes an outer cylindrical portion that covers the outer surface of the enlarged diameter portion of the sealed can, and an outer cylindrical portion that contacts the stepped portion of the sealed can, and a projecting portion that is connected to the outer cylindrical portion and covers the opening end of the enlarged diameter portion.
  • a rising portion is formed that protrudes in the cylinder axis direction of the sealing can from the sealing can side.
  • the width A of the rising portion is smaller than the width B of the outer cylinder portion that covers the outer surface of the enlarged diameter portion.
  • the height h of the rising portion and the width t on the inner side of the rising portion of the outer cylinder portion satisfy h> t.
  • the sealing performance of the gasket is enhanced, and the airtightness inside the battery can be further improved.
  • the gasket further includes an inner cylinder portion covering the inner surface of the enlarged diameter portion of the sealing can. And an inner cylinder part is extended from a projecting part and contact
  • the peripheral wall of the sealed can is pressed against the bottom of the outer can so that the inner cylindrical portion of the gasket is concave in the direction of the peripheral wall of the outer can.
  • the space between the outer can and the sealed can can be further sealed.
  • the sealing performance of the gasket is enhanced, and the airtightness inside the battery can be further improved.
  • the present invention can be industrially used as a flat battery and an assembly member thereof in which the airtightness inside the battery is further improved by enhancing the sealing performance of the gasket.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

L'invention concerne une cellule plate (1) qui est pourvue : d'une boîte extérieure (10) ayant une paroi périphérique tubulaire ; d'une boîte d'étanchéité (20) agencée à l'intérieur de la paroi périphérique (12) de la boîte extérieure (10), l'a boîte d'étanchéité (20) ayant une paroi périphérique tubulaire (22) de diamètre extérieur plus petit que celui de la boîte extérieure (10) ; et d'un joint d'étanchéité (30) disposé entre la paroi périphérique (12) de la boîte extérieure (10) et la paroi périphérique (22) de la boîte d'étanchéité (20). La paroi périphérique (22) de la boîte d'étanchéité (20) comprend une partie étagée (22c) ayant une extrémité ouverte qui s'élargit de manière étagée. Le joint d'étanchéité (30) est pourvu d'une partie de tube externe (31) qui recouvre la surface extérieure de la paroi périphérique (22) de la boîte d'étanchéité (20) et est contiguë à la partie étagée (22c) de la paroi périphérique (22) de la boîte d'étanchéité (20), et d'une partie en saillie (33) qui est disposée entre la paroi périphérique (22) de la boîte d'étanchéité (20) et une partie inférieure (11b) de la boîte extérieure (10) et est contiguë à la partie inférieure (11b) de la boîte extérieure (10). La partie de tube externe (31) comprend une partie de limite (L) qui s'étend, dans la direction radiale de la boîte d'étanchéité (20), depuis une partie d'extrémité de base (22a) jusqu'à une partie qui s'étend davantage du côté paroi périphérique (12) de la boîte extérieure (10) que la paroi périphérique (22) de la boîte d'étanchéité (20).
PCT/JP2015/081117 2014-11-06 2015-11-05 Cellule plate et élément d'assemblage de celle-ci WO2016072438A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016557788A JP6726622B2 (ja) 2014-11-06 2015-11-05 扁平形電池およびその組み立て用部材

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014226384 2014-11-06
JP2014-226384 2014-11-06

Publications (1)

Publication Number Publication Date
WO2016072438A1 true WO2016072438A1 (fr) 2016-05-12

Family

ID=55909162

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/081117 WO2016072438A1 (fr) 2014-11-06 2015-11-05 Cellule plate et élément d'assemblage de celle-ci

Country Status (2)

Country Link
JP (1) JP6726622B2 (fr)
WO (1) WO2016072438A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113871112A (zh) * 2021-09-17 2021-12-31 惠州东铭新能源研究院有限公司 一种电池模组顶部绝缘片生产工艺

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09129198A (ja) * 1995-10-31 1997-05-16 Matsushita Electric Ind Co Ltd 扁平形有機電解質電池
JP2012190758A (ja) * 2011-03-14 2012-10-04 Hitachi Maxell Energy Ltd 扁平形電池
JP2014120449A (ja) * 2012-12-19 2014-06-30 Hitachi Maxell Ltd 扁平形電池

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09129198A (ja) * 1995-10-31 1997-05-16 Matsushita Electric Ind Co Ltd 扁平形有機電解質電池
JP2012190758A (ja) * 2011-03-14 2012-10-04 Hitachi Maxell Energy Ltd 扁平形電池
JP2014120449A (ja) * 2012-12-19 2014-06-30 Hitachi Maxell Ltd 扁平形電池

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113871112A (zh) * 2021-09-17 2021-12-31 惠州东铭新能源研究院有限公司 一种电池模组顶部绝缘片生产工艺
CN113871112B (zh) * 2021-09-17 2023-12-08 惠州东铭新能源材料股份有限公司 一种电池模组顶部绝缘片生产工艺

Also Published As

Publication number Publication date
JP6726622B2 (ja) 2020-07-22
JPWO2016072438A1 (ja) 2017-08-17

Similar Documents

Publication Publication Date Title
US8679672B2 (en) Flat battery
JP6308071B2 (ja) 角形二次電池およびその製造方法
US11757153B2 (en) Cylindrical battery
EP2874200B1 (fr) Batterie plate
WO2021106728A1 (fr) Batterie étanche
WO2016072438A1 (fr) Cellule plate et élément d'assemblage de celle-ci
US11831032B2 (en) Cylindrical battery
CN104335388A (zh) 密闭型电池
US20210119286A1 (en) Cylindrical battery
JP6045830B2 (ja) 扁平形電池
JP5650567B2 (ja) 扁平形電池及び封口缶
JP5486356B2 (ja) 扁平形電池
WO2020137777A1 (fr) Batterie
JP2017212044A (ja) 蓄電素子、及び蓄電素子の製造方法
JP6045799B2 (ja) 扁平形電池
JP5423431B2 (ja) 蓄電モジュールの連結構造及び蓄電モジュールの製造方法
JP5547523B2 (ja) 扁平形電池
JP6286195B2 (ja) 扁平形電池の封口缶、封口缶の製造方法、及び扁平形電池
JP6045848B2 (ja) 扁平形電池
JP7084239B2 (ja) 二次電池
JP5547522B2 (ja) 扁平形電池
JP2018147829A (ja) 蓄電素子及びその製造方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15857054

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2016557788

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15857054

Country of ref document: EP

Kind code of ref document: A1