WO2019069659A1 - Batterie secondaire - Google Patents

Batterie secondaire Download PDF

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Publication number
WO2019069659A1
WO2019069659A1 PCT/JP2018/034136 JP2018034136W WO2019069659A1 WO 2019069659 A1 WO2019069659 A1 WO 2019069659A1 JP 2018034136 W JP2018034136 W JP 2018034136W WO 2019069659 A1 WO2019069659 A1 WO 2019069659A1
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WO
WIPO (PCT)
Prior art keywords
anvil
horn
area
secondary battery
current collector
Prior art date
Application number
PCT/JP2018/034136
Other languages
English (en)
Japanese (ja)
Inventor
山本　祐輝
伸行 堀
飯塚　佳士
裕史 山中
哲徳 多幡
Original Assignee
日立オートモティブシステムズ株式会社
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Application filed by 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Priority to JP2019546608A priority Critical patent/JP6868704B2/ja
Publication of WO2019069659A1 publication Critical patent/WO2019069659A1/fr

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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a secondary battery.
  • Patent Document 1 A secondary battery in which a wound electrode body and a current collector terminal are joined by ultrasonic welding and a method for manufacturing the same are known (see Patent Document 1 below).
  • the invention described in Patent Document 1 provides a highly reliable secondary battery excellent in bonding strength in which the current collector laminate portion is sufficiently joined and the current collector terminal is hardly peeled off from the current collector laminate portion. (See the same document, paragraph 0006, etc.).
  • Patent Document 1 discloses a secondary battery having the following features.
  • the number of weld recesses formed on the surface side of the current-collector laminate by ultrasonic welding is relatively smaller than the number of weld recesses formed on the surface of the current collector terminal, and the current-collector laminate
  • the depression of the weld recess formed on the front surface side of the is formed deeper than the depression of the weld recess formed on the front surface side of the current collecting terminal (see the same document, claim 1, etc.).
  • the welding concave portion is firmly bitten into the current-collector laminated portion to form a depression, so adjacent layers are firmly joined even in the inner layer portion of the current-collector laminated portion.
  • the number of weld recesses formed on the surface side of the current collector terminal is larger than the number of weld recesses formed on the surface side of the current collector laminate, the number of the current collector terminals is large. It is welded at a point and joined to the current collector laminate.
  • the current collecting terminal is disposed on an anvil having a convex portion in ultrasonic welding of the current collector laminate portion of the wound electrode body and the current collecting terminal, that is, ultrasonic metal bonding.
  • the current collector laminate portion of the wound electrode body is disposed thereon, and the horn having the convex portion is disposed thereon. Then, the horn is pressed against the current collector laminated portion, and the convex portion of the horn is inserted into the current collector laminated portion, and the horn is ultrasonically vibrated in a state where the convex portion of the anvil is inserted into the current collector terminal.
  • the area where the anvil has a projection, ie, the projection area of the anvil, is wider than the area where the horn has a projection, ie, the projection area of the horn. Therefore, in the current collector terminal and the current collector laminated portion, the portion held between the convex region of the anvil and the convex region of the horn, and the convex region of the anvil on one side, and the horn on the other side It will have the part where a convex part area
  • the collector terminal and the current-collector laminated portion form an oxide film on the bonding interface at a portion sandwiched between the convex portion area of the anvil and the convex portion area of the horn.
  • the dirt is removed and the grains are close together until the interatomic distance is reached.
  • a strong attractive force acts between the members to form a metallurgical bond, and the current collector terminal and the current collector laminate portion are joined.
  • the convex portion region of the anvil is disposed on one side of the current collecting terminal and the current collector laminated portion, and the convex portion region of the horn is not disposed on the other side.
  • the convex part of the anvil in contact with the current collection terminal vibrates with respect to the current collection terminal. Due to this vibration, the current collecting terminal is scraped by the convex portion of the anvil to generate foreign matter such as fine metal powder, and this foreign matter may be mixed inside the wound electrode body to form a short circuit path.
  • the present invention provides a secondary battery capable of suppressing the generation of foreign matter due to ultrasonic bonding between a wound electrode group and a current collector plate, and a method of manufacturing the same.
  • the secondary battery of the present invention includes a wound electrode group formed by winding an electrode having a foil exposed portion, a current collector plate joined to the flat foil portion which is bundled in a flat shape, and the current collector plate connected to the current collector plate.
  • the current collector plate has an anvil mark area in which a plurality of concave anvil marks are formed by pressing the convex part of the anvil at the time of ultrasonic bonding to the foil exposed part, and the horn mark area and the In at least one direction along the anvil mark area, the positions of both ends of the anvil mark area coincide with the positions of both ends of the horn mark area, or are located inside the positions of both ends of the horn mark area. It is characterized by
  • a horn mark area and an anvil convex area in at least one direction along the anvil mark area are formed. Both end portions face the region where the convex portion of the horn is formed, with the foil exposed portion and the current collector plate interposed therebetween.
  • the convex part of the anvil is formed with respect to the current collector plate in the part where the area where the convex part of the horn is formed is not opposed to the flatly bundled foil exposed part in the one direction.
  • the regions do not face each other.
  • the secondary battery can be prevented from being scraped by the convex portion of the anvil, and the secondary battery can suppress generation of foreign matter due to ultrasonic bonding between the wound electrode group and the current collector. And a method of manufacturing the same.
  • FIG. 1 is a perspective view showing an example of a secondary battery according to Embodiment 1.
  • FIG. FIG. 2 is an exploded perspective view of the secondary battery shown in FIG. The disassembled perspective view which developed a part of wound electrode group shown in FIG. The perspective view which shows the relationship between a horn mark area
  • the side view which shows the formation process of a horn mark area
  • FIG. 7 is a side view illustrating the method of manufacturing the secondary battery according to the second embodiment.
  • FIG. 7 is an enlarged plan view of an anvil mark area of a secondary battery according to a second embodiment.
  • FIG. 7 is an enlarged plan view of an anvil mark area of a secondary battery according to a third embodiment.
  • FIG. 16 is a plan view of the anvil convex portion region in the method of manufacturing the secondary battery according to the fourth embodiment.
  • region shown in FIG. The side view explaining the conventional ultrasonic bonding process.
  • FIG. 1 is a perspective view showing an example of a secondary battery 100 according to Embodiment 1 of the present invention.
  • FIG. 2 is an exploded perspective view of secondary battery 100 shown in FIG.
  • the secondary battery 100 of the present embodiment is, for example, a prismatic lithium ion secondary battery used as a power source of an electric vehicle or the like.
  • the secondary battery 100 includes, for example, a battery case 10, a wound electrode group 30 accommodated in the battery case 10, a current collector plate 40 connected to the wound electrode group 30, and the current collector plate 40. And an external terminal 20 connected to the wound electrode group 30.
  • the secondary battery 100 of the present embodiment mainly has the following configuration.
  • the wound electrode group 30 has a horn mark region 36R in which a plurality of concave horn marks 36 are formed in the foil exposed portions 31c and 32c, and the current collector plate 40 has a plurality of concave anvil marks 43 formed therein. It has an anvil mark area 43R (see FIG. 6, FIG. 7).
  • the positions of both ends of the anvil mark area 43R coincide with the positions of both ends of the horn mark area 36R in at least one direction along the horn mark area 36R and the anvil mark area 43R, or both ends of the horn mark area 36R Located inside the position of the part.
  • each part of the secondary battery 100 of the present embodiment will be described in detail.
  • the XYZ rectangular coordinate system in which the width direction of the flat rectangular secondary battery 100 is the X direction, the thickness direction is the Y direction, and the height direction is the Z direction is used.
  • the configuration may be described.
  • the directions of top, bottom, left, and right are convenient directions for describing the configuration of each part of the secondary battery 100 based on the drawings, and are not limited to the vertical direction or the horizontal direction.
  • Battery container 10 is, for example, a metal container having a flat rectangular box shape, and has a pair of wide side surfaces 10 w having a relatively large area, narrow side surfaces 10 n having a relatively small area, and an elongated rectangular upper surface It has 10t and bottom 10b.
  • Battery container 10 has, for example, a bottomed rectangular cylindrical battery can 11 whose upper portion is opened, and an elongated rectangular flat battery lid 12 for sealing an opening 11 a of the upper portion of the battery can 11. .
  • the battery case 10 has the wound electrode group 30 inserted therein through the opening 11 a of the battery can 11, and the battery cover 12 is welded over the entire circumference of the opening 11 a of the battery can 11 by laser welding, for example. Are sealed by the battery lid 12.
  • the battery cover 12 has through holes 12 a through which a part of the external terminal 20 is inserted at both end portions in the longitudinal direction which is the width direction (X direction) of the secondary battery 100.
  • the battery cover 12 has a gas discharge valve 15 at the central portion in the longitudinal direction.
  • the gas discharge valve 15 is, for example, a portion in which a part of the battery lid 12 is pressed and thinned to form a slit, and is provided integrally with the battery lid 12.
  • the gas discharge valve 15 is cleaved when the internal pressure of the battery container 10 rises to a predetermined pressure, and the gas inside the battery container 10 is discharged to reduce the internal pressure of the battery container 10, thereby reducing the secondary battery 100.
  • the battery cover 12 has, for example, a liquid injection hole 16 between the through hole 12 a and the gas discharge valve 15.
  • the liquid injection hole 16 is provided for injecting an electrolytic solution into the inside of the battery lid 12, and after the injection of the electrolytic solution, the liquid injection hole 16 is sealed by joining the liquid injection valve 17 by laser welding, for example.
  • a non-aqueous electrolytic solution in which a lithium salt such as lithium hexafluorophosphate (LiPF 6 ) is dissolved in a carbonate-based organic solvent such as ethylene carbonate is used as the electrolytic solution injected into the battery container 10 can do.
  • FIG. 3 is an exploded perspective view showing a state in which a part of wound electrode group 30 housed inside battery container 10 of secondary battery 100 shown in FIG. 2 is expanded.
  • the wound electrode group 30 includes, for example, electrodes 31 and 32 and separators 33 and 34 which are insulators for insulating between the electrodes 31 and 32, and the electrodes 31 and 32 and the separators 33 and 34 are alternately stacked. It has a configuration that has been wound up. More specifically, wound electrode group 30 includes, for example, positive electrode 31, separator 33, negative electrode 32, and separator 34, and these are stacked and wound. In the wound electrode group 30, the electrodes wound on the innermost circumference and the outermost circumference are the negative electrode 32, and separators 33 and 34 are further wound on the outer circumference of the negative electrode 32 wound on the outermost circumference. .
  • the negative electrode 32 is a negative electrode metal foil 32a which is a negative electrode current collector, a negative electrode mixture layer 32b formed on both the front and back sides, and a foil exposure where the negative electrode metal foil 32a is exposed from the negative electrode mixture layer 32b. And a portion 32c.
  • the foil exposed portion 32 c of the negative electrode 32 is provided in the width direction (X direction) of the elongated strip-like negative electrode 32, that is, on one side in the direction of the winding axis 30 A of the wound electrode group 30.
  • Negative electrode metal foil 32a is, for example, a copper foil having a thickness of about 10 ⁇ m. That is, in the secondary battery 100 of the present embodiment, the foil exposed portion 32c of the negative electrode 32 is made of, for example, a copper foil.
  • the negative electrode mixture layer 32b is formed, for example, by applying a slurry-like negative electrode mixture on both surfaces of the negative electrode metal foil 32a except for the foil exposed portion 32c, and drying and pressing the applied negative electrode mixture. It is done. Thereafter, the negative electrode metal foil 32a on which the negative electrode mixture layer 32b is formed is cut as appropriate, whereby the negative electrode 32 can be manufactured.
  • the thickness of the negative electrode mixture layer 32b not including the negative electrode metal foil 32a is, for example, about 70 ⁇ m.
  • PVDF polyvinylidene fluoride
  • NMP N-methyl pyrrolidone
  • the negative electrode active material contained in the negative electrode mixture layer 32b is not limited to the above-mentioned amorphous carbon.
  • a negative electrode active material natural graphite capable of inserting and desorbing lithium ions, various artificial graphite materials, carbonaceous materials such as coke, compounds such as Si and Sn (for example, SiO, TiSi 2 etc.), or These composite materials may be used.
  • the particle shape of the negative electrode active material is not particularly limited, and may be, for example, scaly, spherical, fibrous, or massive.
  • the positive electrode 31 is a positive electrode metal foil 31a which is a positive electrode current collector, a positive electrode mixture layer 31b formed on both front and back surfaces thereof, and a foil exposed where the positive electrode metal foil 31a is exposed from the positive electrode mixture layer 31b. And a portion 31c.
  • the foil exposed portion 31 c of the positive electrode 31 is opposite to the foil exposed portion 32 c of the negative electrode 32 in the width direction (X direction) of the long strip-shaped positive electrode 31, that is, in the winding axis 30 A direction of the wound electrode group 30.
  • the positive electrode metal foil 31a is, for example, an aluminum foil having a thickness of about 20 ⁇ m. That is, in the secondary battery 100 of the present embodiment, the foil exposed portion 31c of the positive electrode 31 is made of, for example, aluminum foil.
  • the positive electrode mixture layer 31b is formed, for example, by applying a slurry-like positive electrode mixture on both surfaces of the positive electrode metal foil 31a except for the foil exposed portion 31c, and drying and pressing the coated positive electrode mixture. It is done. Thereafter, the positive electrode 31 can be manufactured by appropriately cutting the positive electrode metal foil 31a on which the positive electrode mixture layer 31b is formed.
  • the thickness of positive electrode mixture layer 31 b not including positive electrode metal foil 31 a is, for example, about 90 ⁇ m.
  • the slurry of the positive electrode mixture is, for example, 10 parts by weight of scaly graphite as a conductive material and 100 parts by weight of lithium manganese oxide (chemical formula LiMn 2 O 4 ) which is a positive electrode active material, and a binder. 10 parts by weight of PVDF may be added, and further, NMP may be added as a dispersion solvent and kneaded.
  • the positive electrode active material contained in the positive electrode mixture layer 31 b is not limited to the above-mentioned lithium manganate.
  • the positive electrode active material another lithium manganate having a spinel crystal structure, or a lithium manganese composite oxide partially substituted or doped with a metal element can be used.
  • lithium cobalt oxide having a layered crystal structure, lithium titanate, or a lithium-metal composite oxide in which a part is substituted or doped with a metal element may be used as the positive electrode active material.
  • the binder used for negative mix and positive mix is not limited to PVDF.
  • the binder for example, polytetrafluoroethylene (PTFE), polyethylene, polystyrene, polybutadiene, butyl rubber, nitrile rubber, styrene butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, vinyl fluoride, Polymers such as vinylidene fluoride, fluorinated propylene, chloroprene fluoride, acrylic resins and mixtures thereof can be used.
  • PTFE polytetrafluoroethylene
  • polyethylene polystyrene
  • polybutadiene butyl rubber
  • nitrile rubber styrene butadiene rubber
  • polysulfide rubber nitrocellulose
  • cyanoethyl cellulose various latexes
  • acrylonitrile vinyl fluoride
  • Polymers such as vinylidene
  • the wound electrode group 30 may have an axial core for stacking and winding the negative electrode 32, the separator 33, the positive electrode 31, and the separator 34.
  • the shaft core for example, one obtained by winding a resin sheet having a bending rigidity higher than that of the positive electrode metal foil 31a, the negative electrode metal foil 32a, and the separators 33 and 34 can be used.
  • the dimension of the negative electrode mixture layer 32b in the direction of the winding axis 30A (X direction) is larger than the dimension of the positive electrode mixture layer 31b, and the positive electrode mixture layer 31b must be the negative electrode mixture layer 32b.
  • foil exposed portion 31c of positive electrode 31 and foil exposed portion 32c of negative electrode 32 are respectively wound at one end and the other end in the direction of winding axis 30A (X direction) as shown in FIG. It is rolled and laminated, and is flatly bundled as shown in FIG. 2 and joined by welding, for example.
  • the dimensions of the separators 33 and 34 are larger than the dimensions of the negative electrode mixture layer 32b.
  • the end portions of the separators 33 and 34 are disposed at positions inside the winding axis 30A direction (X direction) with respect to the end portions of the foil exposed portions 31c and 32c of the positive electrode 31 and the negative electrode 32. There is no hindrance to bundling and welding the foil exposed portions 31 c and 32 c of the positive electrode 31 and the negative electrode 32.
  • the current collector plate 40 is a plate-like member bent into a predetermined shape, and is connected to the wound electrode group 30.
  • the current collector plate 40 includes a positive electrode current collector plate 40 P connected to the positive electrode 31, and a negative electrode current collector plate 40 N connected to the negative electrode 32.
  • the material of positive electrode current collector plate 40P is, for example, aluminum or an aluminum alloy.
  • the material of the negative electrode current collector 40N is, for example, copper or a copper alloy.
  • the current collector plate 40 is bent at the side end of the rectangular plate-like base 41 disposed opposite to the lower surface of the battery lid 12 and at the side end of the base 41 so that the battery case 10 is extended along the wide side 10w of the battery case 10. And a connection end 42 extending toward the bottom surface 10b of the The base 41 of the current collector plate 40 has a through hole 41 a for connecting the external terminal 20.
  • the connection end 42 of the current collector plate 40 is joined to the flat exposed foil portions 31 c and 32 c of the wound electrode group 30.
  • the positive electrode current collector plate 40P is bonded to the foil exposed portion 31c of the positive electrode 31 which is flatly bundled at one side in the direction of the winding axis 30A (X direction) of the wound electrode group 30 by ultrasonic bonding.
  • the negative electrode current collector plate 40N is bonded to the foil exposed portion 32c of the negative electrode 32 flatly bundled on the other side in the direction of the winding axis 30A (X direction) of the wound electrode group 30 by ultrasonic bonding.
  • both the bonding of the positive electrode current collector plate 40P and the foil exposed portion 31c of the positive electrode 31 and the bonding of the negative electrode collector plate 40N and the foil exposed portion 32c of the negative electrode 32 are ultrasonic waves. Although it is joining, at least one of these joining should just be ultrasonic bonding.
  • FIG. 4 is a perspective view showing the relationship between a horn mark area 36R formed by ultrasonic bonding and an anvil mark area 43R.
  • FIG. 5 is a side view showing the process of forming the horn mark area 36R and the anvil mark area 43R.
  • FIG. 6 is an enlarged plan view of the horn mark area 36R.
  • FIG. 7 is an enlarged plan view of the anvil mark area 43R.
  • illustration of the current collection board 40 is abbreviate
  • the secondary battery 100 of the present embodiment is characterized mainly by the following configuration.
  • the wound electrode group 30 has a horn mark region 36R in which a plurality of concave horn marks 36 are formed in the foil exposed portions 31c and 32c.
  • the current collector plate 40 has an anvil mark area 43R in which a plurality of concave anvil marks 43 are formed.
  • the positions of both ends of the anvil mark area 43R coincide with the positions of both ends of the horn mark area 36R in at least one direction (Z direction) along the horn mark area 36R and the anvil mark area 43R, or a horn mark It is located inside the position of the both ends of field 36R.
  • the horn H used for ultrasonic bonding is a laminated portion 35 in which the foil exposed portions 31c and 32c of the electrodes 31 and 32 are wound and laminated flat.
  • the current collector plate 40 is joined by ultrasonic bonding, the current collector plate 40 is pressed against the laminated portion 35 of the foil exposed portions 31 c and 32 c.
  • the plurality of convex portions h provided in the horn H bite into the laminated portion 35 of the foil exposed portions 31c and 32c, and the plurality of concave horn marks 36 corresponding to the convex portions h of the horn H are foil exposed It forms in the lamination
  • the convex portion h of the horn H has, for example, a convex shape of a quadrangular pyramid
  • the horn mark 36 has, for example, a concave shape of a quadrangular pyramid corresponding to the convex portion h of the horn H.
  • the horn mark area 36R is an area in which a plurality of concave horn marks 36 are formed in the foil exposed portions 31c and 32c. More specifically, the horn mark area 36R is an area in which a plurality of concave horn marks 36 are formed in the laminated portion 35 of the foil exposed portions 31c and 32c of the wound electrode group 30.
  • a total of twelve rectangular horn marks 36 in the width direction (X direction) of the secondary battery 100 and six in total in the height direction (Z direction) of the secondary battery 100 are rectangular.
  • positioning of the convex part h of the horn H and the horn mark 36 are an example, and are not specifically limited.
  • the outer edge of horn mark region 36R is the outer side of horn mark 36 disposed at one end and the other end in the width direction (X direction). Match the outer edge of the.
  • the outer edge of horn mark region 36R coincides with the outer edge of horn mark 36 arranged at one end and the other end in the height direction (Z direction). ing.
  • the anvil A used for ultrasonic bonding joins the laminated portion 35 of the foil exposed portions 31 c and 32 c of the wound electrode group 30 and the current collector plate 40 by ultrasonic bonding. Is pressed against the current collector plate 40. Thereby, the plurality of convex portions a provided on the anvil A bite into the current collector plate 40, and the plurality of concave anvil marks 43 corresponding to the convex portions a of the anvil A are connected end portions of the current collector plate 40. 42 are formed.
  • the convex portion a of the anvil A has, for example, a convex shape of a quadrangular pyramid
  • the anvil mark 43 has, for example, a concave shape of a quadrangular pyramid corresponding to the convex portion a of the anvil A.
  • the anvil mark area 43 ⁇ / b> R is an area in which a plurality of concave anvil marks 43 are formed in the current collector plate 40. More specifically, in the anvil mark area 43R, a plurality of concave anvil marks 43 are formed at the connection end 42 of the current collector plate 40 connected to the laminated portion 35 of the foil exposed portions 31c and 32c of the wound electrode group 30. Area. In the example shown in FIG.
  • a rectangular anvil mark 43 has two patterns in the width direction (X direction) of the secondary battery 100 and five patterns in total in the height direction (Z direction) of the secondary battery 100 A total of 12 patterns of three in the width direction (X direction) of the secondary battery 100 and four patterns in the height direction (Z direction) of the secondary battery 100 are the height direction of the secondary battery 100 (Z direction ) Are alternately arranged. Thereby, a total of 22 anvil marks 43 are arranged in a zigzag in the rectangular anvil mark area 43R.
  • positioning of the convex part h of the horn H and the horn mark 36 are an example, and are not specifically limited.
  • the outer edge of the anvil mark region 43R is outside the anvil mark 43 disposed at one end and the other end in the width direction (X direction). Match the outer edge of the.
  • the outer edge of anvil mark region 43R coincides with the outer edge of anvil mark 43 disposed at one end and the other end in the height direction (Z direction). ing.
  • the positions of both ends of the anvil mark area 43R are the positions of both ends of the horn mark area 36R in at least one direction along the horn mark area 36R and the anvil mark area 43R. It coincides with the position or is located inside the positions of both ends of the horn mark area 36R.
  • at least one direction along the horn mark region 36R and the anvil mark region 43R is the height direction (Z direction) of the secondary battery 100.
  • the positions of both ends of the anvil mark area 43R are located inside the positions of both ends of the horn mark area 36R.
  • the positions of both ends of the anvil mark area 43R may be coincident with the positions of both ends of the horn mark area 36R.
  • the dimension La of the anvil trace region 43R is equal to or less than the dimension Lh of the horn trace region 36R.
  • one end of the anvil trace region 43R is overlapped with one end of the horn trace region 36R or located between both ends of the horn trace region 36R, and the other end of the anvil trace region 43R is It overlaps with the other end of the horn mark area 36R or is located between both ends of the horn mark area 36R.
  • positions of both ends of the anvil mark area 43R in another direction (X direction) which intersects the one direction (Z direction) and follows the horn mark area 36R and the anvil mark area 43R. Are located outside the positions of both ends of the horn mark area 36R.
  • the dimension Wa of the anvil mark area 43R is larger than the dimension Wh of the horn mark area 36R.
  • region 36R is more than the area of anvil mark area
  • the horn mark 36 is larger than the anvil mark 43.
  • the opening area, the depth, and the volume of the horn mark 36 are larger than the opening area, the depth, and the volume of the anvil mark 43.
  • the density of the plurality of horn marks 36 is lower than the density of the plurality of anvil marks 43. That is, the density of the plurality of anvil marks 43 is higher than the density of the plurality of horn marks 36.
  • the foil exposed portions 31c and 32c of the electrodes 31 and 32 in which the horn marks 36 are formed are thinner and more flexible and flexible than the current collector plate 40 before winding.
  • the current collector plate 40 has a rigidity higher than that of the laminated portion 35 of the foil exposed portions 31 c and 32 c which are wound and bundled flat.
  • the positive electrode metal foil 31a is, for example, an aluminum foil having a thickness of about several tens of ⁇ m.
  • Negative electrode metal foil 32a is, for example, a copper foil having a thickness of about several ⁇ m to about several tens of ⁇ m.
  • the positive electrode current collector plate 40P is, for example, a plate of aluminum or aluminum alloy having a thickness of about 0.5 mm to several mm.
  • the negative electrode current collector 40N is, for example, a copper or copper alloy plate having a thickness of about 0.5 mm to several mm.
  • the electrodes 31 and 32 of the wound electrode group 30 include the negative electrode 32, and the current collector 40 includes the negative current collector 40N connected to the foil exposed portion 32c of the negative electrode 32. It is.
  • the area of the horn mark area 36R of the foil exposed portion 32c of the negative electrode 32 may be equal to or larger than the area of the anvil mark area 43R of the negative electrode current collector 40N.
  • horn mark region 36R and anvil mark region 43R have dimensions Lh along one direction (Z direction), dimensions Wh in a direction (X direction) in which La crosses in one direction. It is bigger than Wa. More specifically, in the example shown in FIG. 6 and FIG. 7, the secondary battery 100 in which the horn mark region 36R has a dimension Lh along the height direction (Z direction) of the secondary battery 100 intersects the height direction. It is larger than the dimension Wh of 100 in the width direction (X direction). Similarly, in the anvil mark region 43R, the dimension La along the height direction (Z direction) of the secondary battery 100 is smaller than the dimension Wa in the width direction (X direction) of the secondary battery 100 intersecting in the height direction. It is getting bigger. That is, in the horn mark region 36R and the anvil mark region 43R, the height direction (Z direction) of the secondary battery 100 is the longitudinal direction, and the width direction (X direction) of the secondary battery 100 is the lateral direction. .
  • the current collector plate 40 joined by ultrasonic bonding to the stacked portion 35 in which the foil exposed portions 31c and 32c of the wound electrode group 30 are wound and stacked flat is shown in FIG.
  • the battery cover 12 is fixed to the plate-like insulating member 14 and is electrically connected to the external terminal 20.
  • the electrodes 31 and 32 constituting the wound electrode group 30 are electrically connected to the external terminal 20 through the current collector plate 40.
  • the external terminal 20 includes a positive electrode external terminal 20P and a negative electrode external terminal 20N.
  • the material of positive electrode external terminal 20P is, for example, aluminum or an aluminum alloy.
  • the material of negative electrode external terminal 20N is, for example, copper or a copper alloy.
  • the external terminal 20 has, for example, a joint portion 21 joined to the bus bar, and a connection portion 22 connected to the current collector plate 40.
  • the joint portion 21 has a rectangular block shape having a substantially rectangular parallelepiped shape, and is disposed on the battery lid 12 via the gasket 13 having electrical insulation.
  • the connection portion 22 is a cylindrical or cylindrical portion extending in the direction of penetrating the battery lid 12 from the bottom surface of the bonding portion 21 facing the battery lid 12.
  • connection portion 22 of the external terminal 20 is inserted through the through hole 13a of the gasket 13, the through hole 12a of the battery lid 12, the through hole 14a of the insulating member 14, and the through hole 41a of the base 41 of the current collector plate 40. It is plastically deformed and crimped so as to expand the diameter at the lower surface of the base 41 of the current collector plate 40.
  • the external terminal 20 and the current collector plate 40 are electrically connected to each other, and fixed to the battery lid 12 in an electrically insulated state via the gasket 13 and the insulating member 14.
  • the material of the gasket 13 and the insulating member 14 is, for example, a resin having electrical insulation, such as polybutylene terephthalate, polyphenylene sulfide, or perfluoroalkoxy fluorine resin.
  • the current collector plate 40 is joined to the laminated portion 35 in which the foil exposed portions 31 c and 32 c are wound and flatly laminated, and the battery is interposed via the current collector plate 40.
  • an insulating sheet 50 made of an electrically insulating resin and inserted into the battery can 11 from the opening 11 a of the battery can 11.
  • Insulating sheet 50 is made of, for example, a sheet or a plurality of film members made of synthetic resin such as polypropylene.
  • the insulating sheet 50 has a size and a shape that can cover the whole of the wound electrode group 30 to which the current collector plate 40 is joined together with the current collector plate 40.
  • the wound electrode group 30 is wound in a flat shape, and is provided between semi-cylindrical curved portions 30 b provided at both ends in the height direction of the battery container 10 and the curved portions 30 b. And a flat portion 30a.
  • the wound electrode group 30 is inserted into the battery can 11 from one curved portion 30b so that the direction of the wound shaft 30A is along the width direction (X direction) of the secondary battery 100, and the other curved portion 30b is a battery It is arranged to face the lid 12. Thereafter, as described above, the battery lid 12 is joined over the entire circumference of the opening 11 a of the battery can 11 to form the battery container 10, and the electrolytic solution is injected into the battery container 10 through the liquid injection hole 16.
  • the liquid injection valve 17 is joined to the liquid hole 16 and sealed.
  • the secondary battery 100 is charged by supplying power to the electrodes 31 and 32 of the wound electrode group 30 through the external terminal 20 and the current collector plate 40, and the electrode 31 of the wound electrode group 30. , 32 through the current collector plate 40 and the external terminal 20 can supply power to the outside.
  • the method of manufacturing the secondary battery of the present embodiment is characterized by having an ultrasonic bonding step shown in FIGS. 4 and 5.
  • the other processes of the manufacturing method of the secondary battery of this embodiment since a well-known process can be employ
  • a wound electrode group 30 in which the electrodes 31 and 32 having the foil exposed portions 31c and 32c are wound is joined to the foil exposed portions 31c and 32c bundled flat.
  • This is a method of manufacturing a secondary battery 100 including a current collector 40 and an external terminal 20 connected to the current collector 40.
  • the stacked portion 35 of the flat exposed foil exposed portions 31c and 32c and the current collector plate 40 are sandwiched between the horn H and the anvil A, and the horn H is It includes an ultrasonic bonding step of sonic vibration bonding.
  • the horn H has a horn convex portion region HR in which the convex portion h pressed against the foil exposed portions 31c and 32c in the ultrasonic bonding step is formed.
  • the anvil A has the anvil convex part area
  • Horn convex region HR and anvil convex region AR respectively have the same area and shape as, for example, horn mark region 36R and anvil mark region 43R shown in FIGS. 6 and 7. That is, the whole of the horn convex region HR and the anvil convex region AR respectively oppose the horn mark region 36R and the anvil mark region 43R.
  • FIG. 13 is a side view corresponding to FIG. 5 for explaining an ultrasonic bonding step in a conventional method of manufacturing a secondary battery.
  • the ultrasonic bonding step in the conventional method of manufacturing a secondary battery in the height direction (Z direction) of the secondary battery along the horn convex region HR and the anvil convex region AR, both end portions of the anvil convex region AR The position is located outside the positions of both ends of the horn convex region HR. Therefore, in the laminated portion 35 of the current collector plate 40 and the foil exposed portions 31c and 32c, the anvil convex portion area AR is disposed on one side with the portion held between the anvil convex portion area AR and the horn convex portion area HR. , And a portion where the horn protrusion region HR is not disposed on the opposite side.
  • the laminated portion 35 of the current collector plate 40 and the foil exposed portions 31c, 32c is the anvil convex portion area AR and the horn It joins in the part clamped between convex part area
  • the anvil convex region AR is disposed to face the current collector plate 40, and to face the laminated portion 35 of the foil exposed portions 31c and 32c on the opposite side.
  • the convex portion a of the anvil A in contact with the current collector plate 40 vibrates with respect to the current collector plate 40 in a portion where the horn convex portion region HR is not disposed. Due to this vibration, the current collector plate 40 is scraped by the convex portion a of the anvil A to generate foreign matter such as fine metal powder, and this foreign matter may enter the wound electrode group 30 to form a short circuit path.
  • the secondary battery when the secondary battery is initially charged in a state in which the generated metallic foreign matter intrudes into the interior of wound electrode group 30, for example, the metallic foreign matter is dissolved and ionized at the dissolution potential of the positive electrode potential.
  • the ions may diffuse through the electrolytic solution, for example, may be deposited at a deposition potential of the negative electrode potential to form a short circuit between the positive electrode and the negative electrode.
  • the secondary battery in which the internal short circuit path is formed by the metallic foreign matter and the positive electrode 31 and the negative electrode 32 are in a short circuit state may cause a problem such as a decrease in battery capacity.
  • the ultrasonic bonding step in the method of manufacturing the secondary battery 100 according to the present embodiment in at least one direction (Z direction) along the horn convex region HR and the anvil convex region AR.
  • the positions of both ends of the anvil convex portion area AR coincide with the positions of both ends of the horn convex portion area HR, or are positioned inside the positions of both ends of the horn convex portion area HR.
  • both ends of the anvil convex region AR in the height direction (Z direction) of the secondary battery 100 along the horn convex region HR and the anvil convex region AR are located inside the position of the both ends of the horn convex part area
  • the position of one end of anvil convex part field AR may be in agreement with the position of one end of horn convex part area HR.
  • the position of the other end of anvil convex part field AR may be in agreement with the position of the other end of horn convex part area HR.
  • the laminated portion 35 of the flatly bundled foil exposed portions 31c and 32c and the current collector plate 40 are sandwiched between the horn H and the anvil A, and the horn H is ultrasonically vibrated.
  • the both ends of the anvil convex part area AR in at least one direction (Z direction) along the horn convex part area HR and the anvil convex part area AR oppose the horn convex part area HR.
  • the anvil convex portion region with respect to the current collector plate 40 is a portion where the horn convex portion region HR does not face the flatly bundled foil exposed portions 31c, 32c. AR will not be opposed.
  • the convex portion h of the horn H is not pressed against the laminated portion 35 of the foil exposed portions 31c and 32c in at least the one direction (Z direction).
  • the protrusion a of the anvil A is prevented from being pressed against the current collector plate 40 and vibrating.
  • the current collector plate 40 is prevented from being scraped by the convex portion a of the anvil A, and generation of foreign matter due to ultrasonic bonding between the wound electrode group 30 and the current collector plate 40 can be suppressed.
  • the method of manufacturing the secondary battery of the present embodiment it is prevented that foreign matter intrudes into the interior of the wound electrode group 30 to form a short circuit path, and the yield of the secondary battery 100 is improved.
  • the horn convex is faced to the laminated portion 35 of the foil exposed portions 31c and 32c on the opposite side. Since the partial region HR is disposed, wear of the convex portion a of the anvil A in contact with the current collector plate 40 can be suppressed, the life of the anvil A can be extended, and the durability of the anvil A can be improved.
  • the secondary battery 100 manufactured by the method of manufacturing the secondary battery of the present embodiment has the above-described configuration. That is, in the foil exposed portions 31c and 32c of the electrodes 31 and 32 of the wound electrode group 30, the convex portion h of the horn H is pressed at the time of ultrasonic bonding to the current collector plate 40 to form a plurality of concave horn marks 36 It has a horn mark area 36R.
  • the current collector plate 40 has an anvil mark region 43R in which a plurality of concave anvil marks 43 are formed by pressing the convex portion a of the anvil A at the time of ultrasonic bonding to the foil exposed portions 31c and 32c.
  • the positions of both ends of the anvil mark area 43R coincide with the positions of both ends of the horn mark area 36R, or It is located inside the position of both ends.
  • the foil exposed portion 31c opposite to the current collector plate 40 at the time of ultrasonic bonding of the current collector plate 40 and the foil exposed portions 31c and 32c In a state where the protrusion h of the horn H is not pressed against the stacked portion 35 of 32 c, the protrusion a of the anvil A is prevented from being pressed against the current collector plate 40 and vibrating. Therefore, it is prevented that the current collection board 40 is shaved by the convex part a of the anvil A, and generation
  • the area of the horn convex portion region HR is equal to or larger than the area of the anvil convex portion AR
  • the area of the horn mark region 36R is equal to or larger than the area of the anvil mark region 43R.
  • region HR can be reduced, and generation
  • the projection h of the horn H is larger than the projection a of the anvil A. That is, the horn marks 36 are larger than the anvil marks 43.
  • the convex portion h of the horn H firmly bites into the laminated portion 35 in which the relatively flexible and flexible foil exposed portions 31c and 32c are laminated, and the laminated portion 35 with respect to the current collector plate 40 It is possible to perform ultrasonic bonding more reliably.
  • the convex portion h of the horn H is surely bited into the relatively high-current collecting plate 40, and the collecting plate 40 is more reliably surmounted relative to the laminated portion 35 of the foil exposed portions 31c and 32c. It becomes possible to perform sonic bonding.
  • the density of the projections h of the horn H is lower than the density of the projections a of the anvil A. That is, the density of the horn marks 36 is lower than the density of the anvil marks 43.
  • the protrusion h of the horn H bites into the laminated portion 35 in which the relatively flexible and flexible foil exposed portions 31c and 32c are laminated, with a relatively high pressure, and is firmly held. can do.
  • the friction of the convex portion a of the anvil A with the relatively high current collecting plate 40 can be increased and held firmly. Therefore, the laminated portion 35 of the foil exposed portions 31c and 32c and the current collector plate 40 can be ultrasonically bonded more reliably.
  • the foil exposed portions 31c, 32c are thinner and more flexible and flexible than the current collector plate 40 in the state before winding, and the current collector plate 40 is wound and flat bundled foil exposed It has higher rigidity than the portions 31c and 32c.
  • the horn H is wound and pressed against the flat bundled foil exposed portions 31c and 32c, and the anvil A is pressed against the current collector plate 40 to collect the foil exposed portions 31c and 32c.
  • the electrode plate 40 can be ultrasonically bonded.
  • the electrodes 31 and 32 of the wound electrode group 30 include the negative electrode 32, and the current collector 40 includes the negative current collector 40N connected to the foil exposed portion 32c of the negative electrode 32.
  • the area of the horn mark region 36R of the foil exposed portion 32c in the negative electrode 32 may be equal to or larger than the area of the anvil mark region 43R in the negative electrode current collector plate 40N.
  • the negative electrode current collector plate 40N which is relatively low in hardness made of copper or copper alloy and easily generates foreign matter by ultrasonic bonding, generation of foreign matter by ultrasonic bonding is effectively suppressed. it can.
  • the foil exposed portion 32c of the negative electrode 32 is made of copper foil, it has relatively high flexibility and flexibility, but the configuration and manufacturing method of the above-described secondary battery 100 Thus, ultrasonic bonding can be reliably performed on the negative electrode current collector 40N.
  • the dimension along the one direction (Z direction) is larger than the dimension in the direction (X direction) intersecting the one direction.
  • the dimension along the one direction (Z direction) of the horn mark area 36R and the anvil mark area 43R is larger than the dimension in the direction (X direction) intersecting the one direction. Therefore, with respect to the connection terminals of the current collector plate 40 extending along one direction (the Z direction), the laminated portion 35 of the foil exposed portions 31c and 32c of the wound electrode group 30 is more reliably ultrasonicated over a wider range. It can be joined.
  • the current collector plate 40 is prevented from being scraped by the convex portion a of the anvil A, and the wound electrode group 30 and the current collector plate It is possible to suppress the generation of foreign matter due to ultrasonic bonding with 40.
  • foreign matter can be prevented from entering the interior of the wound electrode group 30, formation of a short circuit path can be prevented, and the yield of the secondary battery 100 can be improved.
  • the life of the anvil A can be extended, and the durability of the anvil A can be improved. Therefore, simplification of the manufacturing process of the secondary battery 100, cost reduction, and quality improvement can be realized.
  • FIG. 8 is a side view illustrating the method of manufacturing the secondary battery of the present embodiment.
  • FIG. 9 is an enlarged plan view showing an anvil mark region 43R of the secondary battery of the present embodiment corresponding to FIG. 7 of the secondary battery of the first embodiment.
  • the positions of both ends of the anvil trace region 43R in at least one direction along the horn trace region 36R and the anvil trace region 43R, in the width direction (X direction) of the secondary battery The secondary battery 100 is different from the secondary battery 100 of the first embodiment in that it is located inside the positions of both ends of the horn mark region 36R.
  • the other configuration of the secondary battery of the present embodiment is the same as that of the secondary battery 100 of the first embodiment described above, so the same reference numerals are given to the same parts and the description will be omitted.
  • FIG. 14 is a side view corresponding to FIG. 8 for explaining an ultrasonic bonding step in a conventional method of manufacturing a secondary battery.
  • the positions of both ends of the anvil convex region AR in the width direction (X direction) of the secondary battery along the horn convex region HR and the anvil convex region AR Are located outside the positions of both ends of the horn convex region HR. Therefore, in the laminated portion 35 of the current collector plate 40 and the foil exposed portions 31c and 32c, the anvil convex portion area AR is disposed on one side with the portion held between the anvil convex portion area AR and the horn convex portion area HR. , And a portion where the horn protrusion region HR is not disposed on the opposite side.
  • the laminated portion 35 of the current collector plate 40 and the foil exposed portions 31c, 32c is the anvil convex portion area AR and the horn It joins in the part clamped between convex part area
  • the anvil convex region AR is disposed to face the current collector plate 40, and to face the laminated portion 35 of the foil exposed portions 31c and 32c on the opposite side.
  • the convex portion a of the anvil A in contact with the current collector plate 40 vibrates with respect to the current collector plate 40 in a portion where the horn convex portion region HR is not disposed. Due to this vibration, the current collector plate 40 is scraped by the convex portion a of the anvil A to generate foreign matter such as fine metal powder, and this foreign matter may be mixed in the wound electrode group 30 to form a short circuit path.
  • both ends of the anvil convex portion area AR in at least one direction (X direction) along the horn convex portion area HR and the anvil convex portion area AR are located inside the positions of both ends of the horn convex region HR.
  • the positions of both ends of the anvil convex region AR are It is located inside the position of the both ends of horn convex part field HR.
  • the position of one end of the anvil convex portion area AR may coincide with the position of one end of the horn convex portion region HR.
  • the position of the other end of the anvil convex portion area AR may coincide with the position of the other end of the horn convex portion region HR.
  • the secondary battery of the present embodiment manufactured by the manufacturing method of the present embodiment has an anvil mark in at least one direction (X direction) along the horn mark area 36R and the anvil mark area 43R.
  • the positions of both ends of the region 43R are located at the same positions as the positions of both ends of the horn mark region 36R, or are located inside the positions of both ends of the horn mark region 36R.
  • the same effects as the secondary battery 100 of the first embodiment described above and the method of manufacturing the same can be achieved. That is, the current collector plate 40 is prevented from being scraped by the convex portion a of the anvil A, and generation of foreign matter due to ultrasonic bonding between the wound electrode group 30 and the current collector plate 40 can be suppressed. Therefore, it is possible to prevent foreign matter from entering the inside of the wound electrode group 30, to prevent the formation of a short circuit path, to improve the yield of the secondary battery, and to extend the life of the anvil A. The durability can be improved.
  • FIG. 10 is an enlarged plan view showing the anvil mark region 43R of the secondary battery of the present embodiment corresponding to FIG. 7 of the secondary battery 100 of the first embodiment.
  • the secondary battery of this embodiment has anvil marks in two directions along the horn mark area 36R and the anvil mark area 43R in the width direction (X direction) and the height direction (Z direction) of the secondary cell.
  • the secondary battery 100 is different from the secondary battery 100 according to the first embodiment in that the positions of both ends of the region 43R are located inside the positions of both ends of the horn mark region 36R.
  • the other configuration of the secondary battery of the present embodiment is the same as that of the secondary battery 100 of the first embodiment described above.
  • the positions of both ends of the anvil convex portion area AR coincide with the positions of both ends of the horn convex portion area HR, or are positioned inside the positions of both ends of the horn convex portion area HR. More specifically, in the width direction (X direction) and height direction (Z direction) of the secondary battery, the positions of both ends of the anvil convex portion area AR are the positions of both ends of the horn convex portion area HR, respectively. It is located more inside.
  • the position of one end of the anvil convex portion area AR may coincide with the position of one end of the horn convex portion region HR. Further, in the width direction (X direction) of the secondary battery, the position of the other end of the anvil convex portion area AR may coincide with the position of the other end of the horn convex portion region HR. Further, in the height direction (Z direction) of the secondary battery, the position of one end of the anvil convex portion area AR may coincide with the position of one end of the horn convex portion area HR. Further, in the height direction (Z direction) of the secondary battery, the position of the other end of the anvil convex portion area AR may coincide with the position of the other end of the horn convex portion area HR.
  • the secondary battery of the present embodiment manufactured by the manufacturing method of the present embodiment has two directions (X direction, Z direction) along the horn mark area 36R and the anvil mark area 43R.
  • the positions of both ends of the anvil mark area 43R are located on the inner side of the positions of both ends of the horn mark area 36R or the positions of both ends of the horn mark area 36R.
  • the same effects as the secondary battery 100 of the first embodiment described above and the method of manufacturing the same can be achieved. That is, the current collector plate 40 is prevented from being scraped by the convex portion a of the anvil A, and generation of foreign matter due to ultrasonic bonding between the wound electrode group 30 and the current collector plate 40 can be suppressed. Therefore, it is possible to prevent foreign matter from entering the inside of the wound electrode group 30, to prevent the formation of a short circuit path, to improve the yield of the secondary battery, and to extend the life of the anvil A. The durability can be improved.
  • FIG. 11 is a plan view showing an example of the anvil convex portion area AR of the present embodiment.
  • FIG. 12 is a side view of the anvil convex part area AR shown in FIG.
  • hatching is given to the side surface of the anvil A.
  • the method of manufacturing the secondary battery of the present embodiment is different from the method of manufacturing the secondary battery of the first embodiment in the shape of the convex portion b at the end of the anvil convex portion region AR.
  • the other points of the method of manufacturing the secondary battery of the present embodiment are the same as the method of manufacturing the secondary battery of the first embodiment described above, so the same reference numerals are given to the same parts in the drawings. Omit.
  • the convex portion b at the end of the anvil convex portion region AR is cut halfway from the base end to the distal end of the quadrangular pyramid, and the other convex The protruding height is lower than that of the part a. More specifically, in the example shown in FIG. 11 and FIG. 12, as indicated by the phantom line of the two-dot chain line, the width direction (X direction) and height direction (Z direction) of the secondary battery of the anvil convex portion AR The quadrangular pyramidal convex part arranged at the end of) is assumed.
  • the protrusion of the quadrangular pyramidal shape is a protrusion direction (Y in the width direction (X direction) and the height direction (Z direction) of the secondary battery in the anvil protrusion region AR. Cut between the inner edge and the apex of the proximal end in
  • the protrusion b at the end in the width direction (X direction) and height direction (Z direction) of the secondary battery in the anvil protrusion region AR protrudes more than the protrusion a on the inner side (Y direction) The height at the Thereby, the convex portion b at the end portion in the width direction (X direction) and the height direction (Z direction) of the secondary battery in the anvil convex portion AR is worn by high pressure and vibration at the time of ultrasonic bonding. Chipping is suppressed. Therefore, the durability of the anvil A can be improved and the life of the anvil A can be extended.
  • the present invention can also be applied to a secondary battery using a water-soluble electrolyte, such as a nickel hydrogen battery, a nickel cadmium battery, and a lead storage battery.
  • a water-soluble electrolyte such as a nickel hydrogen battery, a nickel cadmium battery, and a lead storage battery.
  • the present invention is also applicable to capacitors such as lithium ion capacitors.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Secondary Cells (AREA)

Abstract

L'invention concerne : une batterie secondaire pour laquelle la génération de matière étrangère due à la liaison par ultrasons d'un groupe d'électrodes enroulées et d'une plaque collectrice peut être supprimée ; et un procédé de production de la batterie secondaire. Selon la présente invention, des parties d'exposition de feuilles carrément groupées 31c, 32c ont une région de marque de cornet 36R. Une plaque collectrice 40 a une région de marque d'enclume 43R. Dans au moins une direction (direction Z) qui se trouve le long de la région de marque de cornet 36R et de la région de marque d'enclume 43R, les emplacements des deux parties d'extrémité de la région de marque d'enclume 43R coïncident avec les emplacements des deux parties d'extrémité de la région de marque de cornet 36R ou sont davantage à l'intérieur que les emplacements des deux parties d'extrémité de la région de marque de cornet 36R.
PCT/JP2018/034136 2017-10-02 2018-09-14 Batterie secondaire WO2019069659A1 (fr)

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CN111834602A (zh) * 2019-04-23 2020-10-27 丰田自动车株式会社 二次电池的制造方法和二次电池
CN113478087A (zh) * 2021-04-26 2021-10-08 Ns材料有限公司 二次电池用极耳制造方法
WO2023170943A1 (fr) * 2022-03-11 2023-09-14 株式会社 東芝 Batterie et procédé de fabrication de batterie

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JPS56142890U (fr) * 1980-03-21 1981-10-28
JP2001205452A (ja) * 2000-01-24 2001-07-31 Toshiba Corp 超音波溶接装置、超音波溶接方法および密閉電池とその製造方法
JP2014212012A (ja) * 2013-04-18 2014-11-13 トヨタ自動車株式会社 二次電池の製造方法および二次電池
JP2017216148A (ja) * 2016-05-31 2017-12-07 株式会社Ｇｓユアサ 蓄電素子、蓄電装置、及び蓄電素子の製造方法

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JPS56142890U (fr) * 1980-03-21 1981-10-28
JP2001205452A (ja) * 2000-01-24 2001-07-31 Toshiba Corp 超音波溶接装置、超音波溶接方法および密閉電池とその製造方法
JP2014212012A (ja) * 2013-04-18 2014-11-13 トヨタ自動車株式会社 二次電池の製造方法および二次電池
JP2017216148A (ja) * 2016-05-31 2017-12-07 株式会社Ｇｓユアサ 蓄電素子、蓄電装置、及び蓄電素子の製造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111834602A (zh) * 2019-04-23 2020-10-27 丰田自动车株式会社 二次电池的制造方法和二次电池
KR20200124170A (ko) * 2019-04-23 2020-11-02 도요타 지도샤（주） 이차 전지의 제조 방법 및 이차 전지
KR102427682B1 (ko) * 2019-04-23 2022-08-01 도요타 지도샤（주） 이차 전지의 제조 방법 및 이차 전지
CN113478087A (zh) * 2021-04-26 2021-10-08 Ns材料有限公司 二次电池用极耳制造方法
WO2023170943A1 (fr) * 2022-03-11 2023-09-14 株式会社 東芝 Batterie et procédé de fabrication de batterie

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