WO2012029852A1 - Cylindrical secondary battery - Google Patents

Cylindrical secondary battery Download PDF

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Publication number
WO2012029852A1
WO2012029852A1 PCT/JP2011/069773 JP2011069773W WO2012029852A1 WO 2012029852 A1 WO2012029852 A1 WO 2012029852A1 JP 2011069773 W JP2011069773 W JP 2011069773W WO 2012029852 A1 WO2012029852 A1 WO 2012029852A1
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WO
WIPO (PCT)
Prior art keywords
sealing body
lead plate
groove
secondary battery
cylindrical secondary
Prior art date
Application number
PCT/JP2011/069773
Other languages
French (fr)
Japanese (ja)
Inventor
翔太 池田
岡本　拓也
悦幸 鳥坪
藤澤　千浩
Original Assignee
三洋電機株式会社
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Publication date
Application filed by 三洋電機株式会社 filed Critical 三洋電機株式会社
Publication of WO2012029852A1 publication Critical patent/WO2012029852A1/en

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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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • 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
    • H01M10/0422—Cells or battery with cylindrical casing
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/317—Re-sealable arrangements
    • H01M50/325—Re-sealable arrangements comprising deformable valve members, e.g. elastic or flexible valve 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention includes a battery case having an opening that also serves as a terminal of one electrode, a sealing body that also serves as a terminal of the other electrode that seals the opening, and at least a battery case that is built in the battery case and the sealing body. More particularly, the present invention relates to a current collecting structure in which a current collecting lead plate led out from one of the positive and negative electrodes is welded to the lower surface of a sealing body.
  • alkaline storage batteries such as nickel-cadmium storage batteries and nickel-hydride storage batteries interpose a separator between a positive electrode plate and a negative electrode plate and wind them in a spiral shape to form a power generation element.
  • the sealing body After being housed in the case and welding the positive electrode current collector lead plate at one location on the lower surface of the sealing body, the sealing body is sealed by attaching an insulating gasket to the opening of the battery case.
  • the current collector lead plate and the sealing body are welded to form the first welded portion, and then the opening of the battery case is sealed with the sealing body.
  • a current is passed through the positive and negative electrode external terminals of the battery while a part of the unwelded part is in contact with the lower surface of the sealing body, whereby the unwelded portion of the current collector lead plate and the lower surface of the sealing body are welded.
  • Patent Document 1 A method for forming a welded portion has been proposed (Patent Document 1).
  • Patent Document 1 forms the second welded portion by flowing a current through the positive and negative external terminals of the battery, the contact portion between the unwelded portion of the current collecting lead plate and the lower surface of the sealing body When current from the positive and negative electrode external terminals of the battery flows in a state in which the battery is not sufficiently in contact, the welding area of the second welded portion is reduced, resulting in a problem that the welding strength is significantly reduced.
  • Patent Document 2 A method of welding the protrusion and the lower surface of the sealing body has been proposed (FIGS. 4 to 6) (Patent Document 2). According to this method, when a current is supplied to the positive and negative external terminals of the battery, the current density flowing through the protrusions increases, and the generation of Joule heat increases at the protrusions. Thereby, the welding area of the said projection part and a sealing body lower surface welding part increases, and welding strength improves.
  • the method of Patent Document 2 has a problem that the welding area between the protruding portion of the current collecting lead plate and the lower surface of the sealing body is small and the welding strength is not sufficient. Further, in the method of Patent Document 2, when the tip of the protrusion of the current collecting lead is welded to the protrusion on the lower surface of the sealing body, it is difficult to position the tip of the protrusion on the protrusion. If it is placed off, there is a problem that proper welding is not performed.
  • the current collector lead plate there is a need for a method that can increase the welding area between the protrusions of the sealing member and the lower surface of the sealing body, increase the welding strength, and accurately weld the protrusions of the current collector lead plate to the lower surface of the sealing body at a predetermined position.
  • the cylindrical secondary battery of the present invention is a cylindrical type secondary battery that welds the contact portion between the protrusion formed on the current collector lead plate and the lower surface of the sealing body by passing an electric current through the positive and negative external terminals of the battery.
  • a groove is formed on a lower surface of the sealing body on a concentric circle centered on the center of the sealing body, and the width of the groove decreases from the opening to the deepest portion.
  • the tip of the protrusion formed on the lead plate is fitted into the groove on the lower surface of the sealing body and welded to the lower surface of the sealing body.
  • the groove portion on the lower surface of the sealing body of the present invention has a bottom region in which the shape of the outer peripheral portion of the cross section substantially coincides with the shape of the outer peripheral portion of the cross section of the tip of the projection of the current collecting lead plate at the deepest portion and the vicinity thereof. And the tip of the projection of the current collecting lead plate is welded to the bottom region.
  • the shape of the groove portion on the lower surface of the sealing body and the outer peripheral portion of the cross section of the protrusion of the current collecting lead plate are both curved, and the radius of curvature of the surface of the groove portion on the lower surface of the sealing body is the current collector. It is characterized by being larger than the radius of curvature of the surface of the protrusion of the lead plate.
  • the width of the groove portion on the lower surface of the sealing body decreases from the opening portion of the groove portion to the deepest portion. Therefore, the width of the opening portion of the groove portion is formed on the current collecting lead plate. It can be made larger than the diameter of the protruding portion.
  • the protrusion formed on the positive electrode current collector lead plate and the lower surface of the sealing body are welded to each other. Even if the tip slightly deviates from the predetermined welding position on the lower surface of the sealing body, when the sealing body is lowered toward the outer can bottom by the pressing of the sealing body and the outer can bottom by the welding electrode during welding, Since the tip is drawn into the deepest part of the groove, the tip of the projection is brought into surface contact with the groove or a plurality of points with high precision and is welded to a predetermined position on the lower surface of the sealing body with high precision. Moreover, since the groove part is formed on the concentric circle centering on the center of the lower surface of a sealing body, it is not necessary to position with respect to rotation in the axial direction of a sealing body.
  • the welding area when the current is applied to the positive and negative external terminals of the battery to weld the protrusions formed on the positive electrode current collector lead plate and the lower surface of the sealing body increases, The welding strength with the lower surface of the sealing body and the high rate discharge characteristics of the battery are improved.
  • the shape of the outer peripheral portion of the cross section substantially coincides with the shape of the outer peripheral portion of the cross section of the tip of the current collecting lead plate protrusion, and the protrusion of the current collecting lead plate If the tip is welded to the bottom region of the groove, the contact area between the tip of the current collector lead plate protrusion and the groove increases, the welding strength between the current collector lead plate protrusion and the lower surface of the sealing body, and the high rate discharge of the battery. The characteristics are further improved.
  • the shape of the groove and the outer peripheral portion of the cross section of the protrusion are both curved, and the polarity radius of the surface of the groove is larger than the radius of curvature of the surface of the protrusion.
  • the protrusions are more likely to be attracted by the grooves on the lower surface of the sealing body and the fitting accuracy is improved, and the welding strength between the protrusions of the current collecting lead plate and the lower surface of the sealing body and the high rate discharge characteristics of the battery are further improved.
  • FIG. 1 is a perspective view schematically showing a cylindrical secondary battery of the present invention. It is a schematic diagram which shows the welding state of the sealing body lower surface and current collection lead board of the cylindrical secondary battery of this invention. It is sectional drawing which shows typically the state which the projection part of the current collection lead board and the groove part of a sealing body lower surface of a cylindrical secondary battery of this invention fit.
  • FIG. 5 is a schematic view showing a welding method used for manufacturing the cylindrical secondary battery of the present invention, and a projection formed on the positive electrode current collector lead plate and a seal by flowing current through the positive and negative external terminals of the battery. A method of welding the lower surface of the body is shown.
  • FIG. 1 It is a schematic diagram which shows the welding state of the sealing body lower surface of a conventional cylindrical secondary battery, and a current collection lead plate. It is sectional drawing which shows typically the state which the projection part of a current collection lead plate, and the sealing body lower surface of a conventional cylindrical secondary battery contact.
  • the cylindrical secondary battery electrode body 4 is formed by winding a positive electrode plate 1 and a negative electrode plate 2 in a spiral shape with a separator 3 interposed therebetween.
  • the positive electrode plate 1 is a sintered nickel positive electrode manufactured by forming a nickel sintered porous body on the surface of a punching metal and then filling the sintered porous body with an active material mainly composed of nickel hydroxide by a chemical impregnation method. It is a board.
  • the positive electrode plate 1 is resistance-welded to a positive electrode current collector 7 having a punched disc-shaped main body 70 and a current collector lead plate (strip-shaped tab) 71, And electrically connected to the positive terminal 13.
  • the negative electrode plate 2 is a sintered cadmium negative electrode plate manufactured by filling the sintered porous body with an active material mainly composed of cadmium hydroxide by a chemical impregnation method, and is a porous disk made of Ni-plated Fe.
  • the negative electrode current collector 5 is connected to the concave portion 621 of the bottom 62 of the cylindrical outer can 6 that also serves as a negative electrode terminal.
  • the separator 3 is made of, for example, nylon or polypropylene, and is used for holding the electrolyte well and electrically insulating the positive electrode plate 1 and the negative electrode plate 2.
  • the positive electrode current collector 7 and the negative electrode current collector 5 are made of a member having excellent conductivity, for example, a nickel-plated metal plate.
  • the positive electrode current collector 7 is set such that the length of the current collecting lead plate 71 is shorter than the diameter of the main body 70. This is not only for the purpose of shortening the current path of the current collecting lead plate 71, but also for enabling efficient resistance welding (so-called direct welding method) with the sealing body 12 mounted on the tab 71 during manufacture. It is a thing.
  • the current collecting lead plate 71 is inserted through the insulating ring 8.
  • the insulating ring 8 is disposed so as to cover the upper end of the electrode body 4.
  • the periphery thereof is surrounded by the insulating gasket 11.
  • the sealing body 12 is provided with an opening (gas vent hole) 14 in the center, and a dish-like positive electrode terminal 13 is mounted so as to cover the opening.
  • valve plate 9 and the coil spring 10 are sequentially placed from the bottom to the top.
  • the valve plate 9 acts as a safety valve by being pressed around the central opening 14 by the elastic force of the coil spring 10.
  • An elastomer such as rubber may be used in place of the valve plate 9 and the coil spring 10.
  • a hemispherical protrusion 20 is formed on the surface of the protrusion of the current collector lead and the groove lower surface of the sealing body that contacts the lower surface of the sealing body near the tip of the current collector lead plate 71 (FIG. 2).
  • the method for forming the protrusion 20 is not particularly limited, but it is preferable in terms of manufacturability to form the current collector lead plate 71 by pressing.
  • a ring-shaped groove 40 is formed on a concentric circle centering on the center of the sealing body (FIG. 2).
  • the groove portion 40 need not be formed over the entire circumference of the concentric circle centered on the center of the sealing body, but is preferably formed over the entire circumference of the concentric circle centered on the center of the sealing body.
  • the method for forming the groove 40 is not particularly limited, but it is preferable in terms of manufacturability to form the groove plate 40 by pressing the lower surface of the sealing plate.
  • the groove portion 40 on the lower surface of the sealing body has a width that decreases from the deepest portion 41 to the opening portion 42, and the outer peripheral portion of the cross section is substantially V-shaped or U-shaped (FIG. 3).
  • welding is performed when the protruding portion 20 formed on the positive electrode current collecting lead plate 71 and the lower surface of the sealing body are welded.
  • the sealing body 12 is lowered in the direction of the outer can bottom portion 62 so that the protruding portion 20 of the current collecting lead plate 71 is drawn into the groove portion 40 on the lower surface of the sealing body.
  • tip of the projection part 20 carries out a surface contact or multiple point contact with the groove part 40 with sufficient precision.
  • the groove part 40 is formed on the concentric circle centering on the sealing body lower surface center, it is not necessary to position with respect to rotation to the axial direction of a sealing body. As described above, the contact area between the tip of the protruding portion 20 of the current collecting lead plate and the groove 40 is increased, and the welding strength between the protruding portion 20 of the current collecting lead plate and the lower surface of the sealing body and the high rate discharge characteristics of the battery are improved.
  • the groove portion 40 has a bottom region 43 in which the shape of the outer peripheral portion of the cross section substantially coincides with the shape of the outer peripheral portion of the tip of the projection of the current collecting lead plate at the deepest portion 41 and in the vicinity thereof.
  • the tip of the projection 20 of the current collector lead plate is in close contact with the deepest portion of the groove and the vicinity thereof, so that the welding area increases, and the projection of the current collector lead plate and the lower surface of the sealing body The welding strength and the high-rate discharge characteristics of the battery are further improved.
  • the shape of the outer peripheral portion of the cross section of the groove portion 40 on the lower surface of the sealing body and the projection portion 20 of the current collector lead plate 71 is both curved, and the radius of curvature of the surface of the groove portion 40 on the lower surface of the sealing body is If the radius of curvature of the surface of the projection of the electric lead plate 71 is larger than that of the surface of the projection (FIG. 3C), the tip of the projection 20 of the current collector lead plate 71 is in close contact with the deepest portion of the groove and the vicinity thereof.
  • the leading end of the projection 20 of the current collector lead plate is easily drawn into the groove 40 on the lower surface of the sealing body and positioning accuracy is improved, so that the welding area is increased and the projection portion of the current collector lead plate and the sealing body are increased.
  • the welding strength with the lower surface and the high rate discharge characteristics of the battery are further improved.
  • the positive electrode plate 1 and the negative electrode plate 2 having the above-described configuration formed in a predetermined size are wound through a separator 3 to produce an electrode body 4.
  • the electrode body 4 and the negative electrode current collector 5 are housed in an outer can 6, and a predetermined electrolytic solution is injected into the outer can 6.
  • an insulating ring 8 is inserted into the positive electrode current collector 7 and accommodated so as to be placed on the electrode body 4. At this time, the tip of the current collecting lead plate 71 is placed on the insulating ring 8.
  • the sealing body 12 is fitted into the opening of the outer can 6. Thereafter, the welding electrodes W1 and W2 are arranged to be pressed against the sealing body 12 and the outer can bottom 62 from the vertical direction of the battery (see FIG. 4A), and direct resistance welding is performed. At this time, due to the pressing of the sealing body 12 and the outer can bottom 62 by the welding electrodes W1 and W2, the sealing body 12 descends in the direction of the outer can bottom 62, and the protrusion 20 of the current collector lead plate 71 is a groove on the lower surface of the sealing body. 40 so as to be drawn in. After that, caulking sealing is performed around the sealing body 12 to seal the inside of the battery (FIG. 4B). Thus, a sealed battery is completed.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention provides a cylindrical secondary battery in which the contact portion between the bottom surface of a seal (12) and a projection (20) formed on a collector lead plate (71) is welded by feeding an electric current to the external terminals of the positive and negative electrodes of the battery, wherein a groove (40) is formed in the bottom surface of the seal in a concentric circle drawn about the center of the seal, the width of the groove (40) decreases in the direction from an opening (42) to the deepest part (41), and the distal end of the projection (20) formed on the collector lead plate (71) is fitted into the groove (40) in the bottom surface of the seal and is welded to the bottom surface of the seal.

Description

円筒型二次電池Cylindrical secondary battery
本発明は、一方極の端子を兼ねる開口部を備えた電池ケースと、この開口部を密封する他方極の端子を兼ねる封口体と、これら電池ケースおよび封口体よりなる電池容器内に組み込まれる少なくとも正・負極からなる発電要素とを備えたアルカリ蓄電池に関するものであり、特に、正・負極の一方から導出した集電リード板を封口体の下面に溶接する集電構造に関するものである。 The present invention includes a battery case having an opening that also serves as a terminal of one electrode, a sealing body that also serves as a terminal of the other electrode that seals the opening, and at least a battery case that is built in the battery case and the sealing body. More particularly, the present invention relates to a current collecting structure in which a current collecting lead plate led out from one of the positive and negative electrodes is welded to the lower surface of a sealing body.
一般に、ニッケル－カドミウム蓄電池、ニッケル－水素化物蓄電池などのアルカリ蓄電池は、正極板及び負極板の間にセパレータを介在させ、これらを渦巻状に巻回して発電要素を形成し、この発電要素を金属製電池ケースに収納して正極の集電リード板を封口体下面の一個所で溶接した後、電池ケースの開口部に絶縁ガスケットを介在させて封口体を装着することにより密閉している。 In general, alkaline storage batteries such as nickel-cadmium storage batteries and nickel-hydride storage batteries interpose a separator between a positive electrode plate and a negative electrode plate and wind them in a spiral shape to form a power generation element. After being housed in the case and welding the positive electrode current collector lead plate at one location on the lower surface of the sealing body, the sealing body is sealed by attaching an insulating gasket to the opening of the battery case.
ところで、電動工具、電気自転車および電動バイク等の電源として、このようなアルカリ蓄電池を使用する用途がある。これらの用途においては、使用時に電源である電池にも振動が加わるため、振動によって集電リード板が封口体から外れないような耐振動性が必要である。また、これらの用途では、大電流での放電が要求されるので、内部抵抗を低減する必要がある。 By the way, there exists a use which uses such an alkaline storage battery as power supplies, such as an electric tool, an electric bicycle, and an electric motorcycle. In these applications, since vibration is also applied to the battery as a power source during use, vibration resistance is required so that the current collecting lead plate is not detached from the sealing body due to vibration. In these applications, since discharge with a large current is required, it is necessary to reduce the internal resistance.
この要求を満足するため、例えば、集電リード板と封口体とを溶接して第１の溶接部を形成した後、電池ケースの開口部を封口体で封口し、次いで、集電リード板の未溶接部分の一部を封口体下面に接触させた状態で電池の正・負極外部端子に電流を流すことにより、集電リード板の未溶接部と封口体下面とを溶接して第２の溶接部を形成する方法が提案されている（特許文献１）。この方法によると、集電リード板の未溶接部と封口体下面との溶接個所が増えるので、振動によって集電リード板が封口体からはずれる可能性が低くなり、また、封口体下面から電極体までの集電経路が短くなり、内部抵抗が低減される。 In order to satisfy this requirement, for example, the current collector lead plate and the sealing body are welded to form the first welded portion, and then the opening of the battery case is sealed with the sealing body. A current is passed through the positive and negative electrode external terminals of the battery while a part of the unwelded part is in contact with the lower surface of the sealing body, whereby the unwelded portion of the current collector lead plate and the lower surface of the sealing body are welded. A method for forming a welded portion has been proposed (Patent Document 1). According to this method, since the number of welded portions between the unwelded portion of the current collector lead plate and the lower surface of the sealing body is increased, the possibility that the current collector lead plate is detached from the sealing body due to vibration is reduced, and the electrode body from the lower surface of the sealing body is reduced. The current collection path is shortened, and the internal resistance is reduced.
しかしながら、特許文献１の方法は、電池の正・負極外部端子に電流を流すことにより、第２の溶接部を形成するので、集電リード板の未溶接部と封口体下面との接触部分とが十分に接触しない状態で電池の正・負極外部端子からの電流が流れると、第２の溶接部の溶接面積が減少し、溶接強度が著しく低下するという問題が生じる。 However, since the method of Patent Document 1 forms the second welded portion by flowing a current through the positive and negative external terminals of the battery, the contact portion between the unwelded portion of the current collecting lead plate and the lower surface of the sealing body When current from the positive and negative electrode external terminals of the battery flows in a state in which the battery is not sufficiently in contact, the welding area of the second welded portion is reduced, resulting in a problem that the welding strength is significantly reduced.
この問題に対処するため、例えば、正極集電リード板に複数の突起部を形成し、当該突起部を封口体下面に接触させながら、電池の正・負極外部端子に電流を流すことによって、当該突起部と封口体下面を溶接する方法が提案されている（図４～６）（特許文献２）。
この方法によれば、電池の正・負極外部端子に電流を流す際に、突起部に流れる電流密度が増加して、突起部でジュール熱の発生が大きくなる。これにより、当該突起部と封口体下面溶接部の溶接面積が増加し、溶接強度が向上する。 In order to cope with this problem, for example, by forming a plurality of protrusions on the positive electrode current collector lead plate and bringing the protrusions into contact with the lower surface of the sealing body, a current is passed through the positive and negative electrode external terminals of the battery. A method of welding the protrusion and the lower surface of the sealing body has been proposed (FIGS. 4 to 6) (Patent Document 2).
According to this method, when a current is supplied to the positive and negative external terminals of the battery, the current density flowing through the protrusions increases, and the generation of Joule heat increases at the protrusions. Thereby, the welding area of the said projection part and a sealing body lower surface welding part increases, and welding strength improves.
しかしながら、特許文献２の方法は、集電リード板の突起部と封口体下面との溶接面積が小さく、溶接強度が十分でないという問題がある。また、特許文献２の方法は、集電リードの突起の先端を封口体下面の突出部に溶接する場合には、突起の先端が突出部に位置決めするのが難しく、突起の先端が突出部から外れて配置されると、適切な溶接がされないという問題がある。 However, the method of Patent Document 2 has a problem that the welding area between the protruding portion of the current collecting lead plate and the lower surface of the sealing body is small and the welding strength is not sufficient. Further, in the method of Patent Document 2, when the tip of the protrusion of the current collecting lead is welded to the protrusion on the lower surface of the sealing body, it is difficult to position the tip of the protrusion on the protrusion. If it is placed off, there is a problem that proper welding is not performed.
特開平10-72943号公報Japanese Patent Laid-Open No. 10-72943 特開平10-261397号公報Japanese Patent Laid-Open No. 10-261397
以上のように、電池の正・負極外部端子に電流を流すことによって、正極集電リード板に形成された突起部と封口体下面とを溶接する円筒型二次電池においては、集電リード板の突起部を封口体下面との溶接面積を大きくし、溶接強度を高めるとともに、集電リード板の突起部を封口体下面と所定の位置に精度よく溶接できる方法が求められている。 As described above, in the cylindrical secondary battery in which the projection formed on the positive electrode current collector lead plate and the lower surface of the sealing body are welded by flowing current to the positive and negative external terminals of the battery, the current collector lead plate There is a need for a method that can increase the welding area between the protrusions of the sealing member and the lower surface of the sealing body, increase the welding strength, and accurately weld the protrusions of the current collector lead plate to the lower surface of the sealing body at a predetermined position.
そこで、本発明の円筒型二次電池は、電池の正・負極外部端子に電流を流すことによって、集電リード板に形成された突起部と封口体下面との接触部分を溶接する円筒型二次電池であって、前記封口体下面には、封口体中央を中心とする同心円上に溝部が形成されており、前記溝部は、開口部から最深部にかけて幅が減少しており、前記集電リード板に形成された突起部の先端が、前記封口体下面の溝部に嵌合して封口体下面に溶接されていることを特徴とする。 Therefore, the cylindrical secondary battery of the present invention is a cylindrical type secondary battery that welds the contact portion between the protrusion formed on the current collector lead plate and the lower surface of the sealing body by passing an electric current through the positive and negative external terminals of the battery. In the secondary battery, a groove is formed on a lower surface of the sealing body on a concentric circle centered on the center of the sealing body, and the width of the groove decreases from the opening to the deepest portion. The tip of the protrusion formed on the lead plate is fitted into the groove on the lower surface of the sealing body and welded to the lower surface of the sealing body.
また本発明の、前記封口体下面の溝部は、最深部及びその近傍に、断面の外周部分の形状が前記集電リード板の突起の先端の断面の外周部分の形状と略一致する底部領域を有するとともに、前記集電リード板の突起の先端が前記底部領域に溶接されていることを特徴としている。 Further, the groove portion on the lower surface of the sealing body of the present invention has a bottom region in which the shape of the outer peripheral portion of the cross section substantially coincides with the shape of the outer peripheral portion of the cross section of the tip of the projection of the current collecting lead plate at the deepest portion and the vicinity thereof. And the tip of the projection of the current collecting lead plate is welded to the bottom region.
さらに、前記封口体下面の溝部と前記集電リード板の突起の断面の外周部分の形状は、いずれも曲線状であって、前記封口体下面の溝部の表面の極率半径が、前記集電リード板の突起の表面の極率半径より大きくなっていることを特徴としている。 Further, the shape of the groove portion on the lower surface of the sealing body and the outer peripheral portion of the cross section of the protrusion of the current collecting lead plate are both curved, and the radius of curvature of the surface of the groove portion on the lower surface of the sealing body is the current collector. It is characterized by being larger than the radius of curvature of the surface of the protrusion of the lead plate.
本発明の円筒型二次電池によれば、封口体下面の溝部の幅は、溝部の開口部から最深部にかけて減少しているので、溝部の開口部の幅は、集電リード板に形成された突起部の直径より大きくすることができる。 According to the cylindrical secondary battery of the present invention, the width of the groove portion on the lower surface of the sealing body decreases from the opening portion of the groove portion to the deepest portion. Therefore, the width of the opening portion of the groove portion is formed on the current collecting lead plate. It can be made larger than the diameter of the protruding portion.
このような構造であると、電池の正・負極外部端子に電流を流すことによって、正極集電リード板に形成された突起部と封口体下面とを溶接する、集電リード板の突起部の先端が、封口体下面の所定の溶接位置から多少ずれたとしても、溶接時の溶接電極による封口体と外装缶底部の押圧によって封口体が外装缶底部に向けて降下する際に、突起部の先端が溝部の最深部に誘い込まれるので、突起部の先端が溝部に精度よく面接触又は複数点接触するとともに、封口体下面の所定の位置に精度良く溶接される。また、溝部は、封口体下面中央を中心とする同心円上に形成されているので、封口体の軸方向に回転に対し、位置決めをする必要が無い。 With such a structure, by passing a current to the positive and negative external terminals of the battery, the protrusion formed on the positive electrode current collector lead plate and the lower surface of the sealing body are welded to each other. Even if the tip slightly deviates from the predetermined welding position on the lower surface of the sealing body, when the sealing body is lowered toward the outer can bottom by the pressing of the sealing body and the outer can bottom by the welding electrode during welding, Since the tip is drawn into the deepest part of the groove, the tip of the projection is brought into surface contact with the groove or a plurality of points with high precision and is welded to a predetermined position on the lower surface of the sealing body with high precision. Moreover, since the groove part is formed on the concentric circle centering on the center of the lower surface of a sealing body, it is not necessary to position with respect to rotation in the axial direction of a sealing body.
以上により、電池の正・負極外部端子に電流を流して正極集電リード板に形成された突起部と封口体下面の溶接を行う際の溶接面積が増加し、集電リード板の突起部と封口体下面との溶接強度及び電池のハイレート放電特性が向上する。 As a result, the welding area when the current is applied to the positive and negative external terminals of the battery to weld the protrusions formed on the positive electrode current collector lead plate and the lower surface of the sealing body increases, The welding strength with the lower surface of the sealing body and the high rate discharge characteristics of the battery are improved.
また、集電体リード板に形成された突起部と封口下面の溝部に制度よく溶接されることから、集電体部から溶接部までの距離が安定化され、その部分に生じる抵抗が定められ、ハイレート放電特性のバラツキを軽減させることができる。 Also, since the projections formed on the current collector lead plate and the groove on the bottom surface of the seal are systematically welded, the distance from the current collector to the weld is stabilized, and the resistance generated at that part is determined. , Variations in high-rate discharge characteristics can be reduced.
特に、溝の最深部及びその近傍に、断面の外周部分の形状が集電リード板の突起の先端の断面の外周部分の形状と略一致する底部領域を有するとともに、集電リード板の突起の先端が溝の底部領域に溶接されていると、集電リード板の突起先端と溝部との接触面積が増加し、集電リード板の突起部と封口体下面との溶接強度及び電池のハイレート放電特性がさらに向上する。 In particular, at the deepest part of the groove and in the vicinity thereof, there is a bottom region in which the shape of the outer peripheral portion of the cross section substantially coincides with the shape of the outer peripheral portion of the cross section of the tip of the current collecting lead plate protrusion, and the protrusion of the current collecting lead plate If the tip is welded to the bottom region of the groove, the contact area between the tip of the current collector lead plate protrusion and the groove increases, the welding strength between the current collector lead plate protrusion and the lower surface of the sealing body, and the high rate discharge of the battery. The characteristics are further improved.
また、溝部と前記突起の断面の外周部分の形状は、いずれも曲線状であって、溝部の表面の極率半径が、突起の表面の極率半径より大きくなっていると、集電リード板の突起が封口体下面の溝部により誘い込まれやすくなって嵌合精度が向上するとともに、集電リード板の突起部と封口体下面との溶接強度及び電池のハイレート放電特性が一層向上する。 In addition, the shape of the groove and the outer peripheral portion of the cross section of the protrusion are both curved, and the polarity radius of the surface of the groove is larger than the radius of curvature of the surface of the protrusion. The protrusions are more likely to be attracted by the grooves on the lower surface of the sealing body and the fitting accuracy is improved, and the welding strength between the protrusions of the current collecting lead plate and the lower surface of the sealing body and the high rate discharge characteristics of the battery are further improved.
本発明の円筒型二次電池を模式的に示す斜視図である。1 is a perspective view schematically showing a cylindrical secondary battery of the present invention. 本発明の円筒型二次電池の封口体下面と集電リード板の溶接状態を示す模式図である。It is a schematic diagram which shows the welding state of the sealing body lower surface and current collection lead board of the cylindrical secondary battery of this invention. 本発明の円筒型二次電池の、集電リード板の突起部と封口体下面の溝部が嵌合する状態を模式的に示す断面図である。It is sectional drawing which shows typically the state which the projection part of the current collection lead board and the groove part of a sealing body lower surface of a cylindrical secondary battery of this invention fit. 本発明の円筒型二次電池の製造に使用する溶接方法を示す概略図であって、電池の正・負極外部端子に電流を流すことによって、正極集電リード板に形成された突起部と封体下面とを溶接する方法を示している。FIG. 5 is a schematic view showing a welding method used for manufacturing the cylindrical secondary battery of the present invention, and a projection formed on the positive electrode current collector lead plate and a seal by flowing current through the positive and negative external terminals of the battery. A method of welding the lower surface of the body is shown. 従来の円筒型二次電池の封口体下面と集電リード板の溶接状態を示す模式図である。It is a schematic diagram which shows the welding state of the sealing body lower surface of a conventional cylindrical secondary battery, and a current collection lead plate. 従来の円筒型二次電池の、集電リード板の突起部と封口体下面が接触する状態を模式的に示す断面図である。It is sectional drawing which shows typically the state which the projection part of a current collection lead plate, and the sealing body lower surface of a conventional cylindrical secondary battery contact.
また以下に、本発明の円筒型二次電池の一実施の形態を図１～６に基づいて説明する。この場合、円筒型二次電池としてニッケルカドミウム蓄電池を用いた場合について説明するが、本発明はこれに限定されるものでなく、その要旨を変更しない範囲で適宜変更して実施することができる。 In the following, an embodiment of the cylindrical secondary battery of the present invention will be described with reference to FIGS. In this case, a case where a nickel cadmium storage battery is used as the cylindrical secondary battery will be described. However, the present invention is not limited to this, and can be implemented with appropriate modifications without departing from the scope of the invention.
１．円筒型二次電池
電極体４は、正極板１と負極板２とをセパレータ３を介して渦巻き状に巻回されてなる。正極板１は、パンチングメタルの表面にニッケル焼結多孔体を形成した後、化学含浸法により水酸化ニッケルを主体とする活物質を前記焼結多孔体内に充填して製造した焼結式ニッケル正極板である。当該正極板１は、パンチング加工された円盤状の本体部７０と集電リード板（短冊状のタブ）７１を持つ正極集電体７に対して抵抗溶接されており、上記封口体１２を介して、正極端子１３に電気的に接続されている。 1. The cylindrical secondary battery electrode body 4 is formed by winding a positive electrode plate 1 and a negative electrode plate 2 in a spiral shape with a separator 3 interposed therebetween. The positive electrode plate 1 is a sintered nickel positive electrode manufactured by forming a nickel sintered porous body on the surface of a punching metal and then filling the sintered porous body with an active material mainly composed of nickel hydroxide by a chemical impregnation method. It is a board. The positive electrode plate 1 is resistance-welded to a positive electrode current collector 7 having a punched disc-shaped main body 70 and a current collector lead plate (strip-shaped tab) 71, And electrically connected to the positive terminal 13.
負極板２は、同様に化学含浸法により水酸化カドミウムを主体とする活物質を前記焼結多孔体内に充填して製造した焼結式カドミウム負極板であり、ＮｉメッキしたＦｅからなる多孔性円盤状の負極集電体５によって、負極端子を兼ねる円筒型外装缶６の底部６２の凹部６２１に接続されている。 Similarly, the negative electrode plate 2 is a sintered cadmium negative electrode plate manufactured by filling the sintered porous body with an active material mainly composed of cadmium hydroxide by a chemical impregnation method, and is a porous disk made of Ni-plated Fe. The negative electrode current collector 5 is connected to the concave portion 621 of the bottom 62 of the cylindrical outer can 6 that also serves as a negative electrode terminal.
セパレータ３は、例えばナイロンやポリプロピレン製のものであって、電解液を良好に保持し、かつ正極板１および負極板２とを電気的に絶縁するために用いる。 The separator 3 is made of, for example, nylon or polypropylene, and is used for holding the electrolyte well and electrically insulating the positive electrode plate 1 and the negative electrode plate 2.
上記正極集電体７、負極集電体５は、導電性に優れる部材、例えばニッケルメッキした金属板から構成される。このうち正極集電体７は、集電リード板７１の長さが本体部７０の直径よりも短くなるように設定されている。これは、集電リード板７１の電流路を短縮する目的のほか、製造時に当該タブ７１に対して封口体１２を載置した状態で効率よく抵抗溶接（いわゆるダイレクト溶接法）が行えるようにされたものである。 The positive electrode current collector 7 and the negative electrode current collector 5 are made of a member having excellent conductivity, for example, a nickel-plated metal plate. Among these, the positive electrode current collector 7 is set such that the length of the current collecting lead plate 71 is shorter than the diameter of the main body 70. This is not only for the purpose of shortening the current path of the current collecting lead plate 71, but also for enabling efficient resistance welding (so-called direct welding method) with the sealing body 12 mounted on the tab 71 during manufacture. It is a thing.
なお集電リード板７１は、絶縁リング８に挿通されている。そして当該絶縁リング８が電極体４の上方端部を覆うように配置される。外装缶６上端の開口部に配される封口体１２では、その周囲が絶縁ガスケット１１によって囲まれている。封口体１２には中央に開口部（ガス抜き孔）１４が設けられ、これを覆うように皿状の正極端子１３が装着される。 The current collecting lead plate 71 is inserted through the insulating ring 8. The insulating ring 8 is disposed so as to cover the upper end of the electrode body 4. In the sealing body 12 arranged in the opening at the upper end of the outer can 6, the periphery thereof is surrounded by the insulating gasket 11. The sealing body 12 is provided with an opening (gas vent hole) 14 in the center, and a dish-like positive electrode terminal 13 is mounted so as to cover the opening.
封口体１２と正極端子１３の内部空間には、下から上に向かって弁板９、コイルスプリング１０が順次載置される。このうち、弁板９はコイルスプリング１０の弾性力によって上記中央開口部１４の周囲に押圧されることで、安全弁として作用するようになっている。なお、弁板９、コイルスプリング１０の代わりにゴム等のエラストマーを用いてもよい。 In the internal space of the sealing body 12 and the positive electrode terminal 13, the valve plate 9 and the coil spring 10 are sequentially placed from the bottom to the top. Among these, the valve plate 9 acts as a safety valve by being pressed around the central opening 14 by the elastic force of the coil spring 10. An elastomer such as rubber may be used in place of the valve plate 9 and the coil spring 10.
２．集電リードの突起部及び封口体下面の溝部
集電リード板７１の先端付近の封口体下面に当接する面には、半球形の突起部２０が形成されている（図２）。突起部２０を形成する方法は特に限定されないが、集電リード板７１をプレス加工することにより形成するのが製造性の面で好ましい。 2. A hemispherical protrusion 20 is formed on the surface of the protrusion of the current collector lead and the groove lower surface of the sealing body that contacts the lower surface of the sealing body near the tip of the current collector lead plate 71 (FIG. 2). The method for forming the protrusion 20 is not particularly limited, but it is preferable in terms of manufacturability to form the current collector lead plate 71 by pressing.
一方、封口体下面の膨出部の表面には、リング状の溝部４０が封口体中央を中心とする同心円上に形成されている（図２）。溝部４０は、封口体中心を中心とする同心円の全周にわたって形成する必要はないが、位置決めを容易にするためには、封口体中心を中心とする同心円の全周にわたって形成するのが好ましい。溝部４０を形成する方法は特に限定されないが、封口板下面をプレス加工することにより形成するのが製造性の面で好ましい。 On the other hand, on the surface of the bulging portion on the lower surface of the sealing body, a ring-shaped groove 40 is formed on a concentric circle centering on the center of the sealing body (FIG. 2). The groove portion 40 need not be formed over the entire circumference of the concentric circle centered on the center of the sealing body, but is preferably formed over the entire circumference of the concentric circle centered on the center of the sealing body. The method for forming the groove 40 is not particularly limited, but it is preferable in terms of manufacturability to form the groove plate 40 by pressing the lower surface of the sealing plate.
封口体下面の溝部４０は、最深部４１から開口部４２にかけて先細るように幅が減少しており、断面の外周部分が略Ｖ字又は略Ｕ字状となっている（図３）。集電リードの突起部２０及び封口体下面の溝部４０がこのような構造を有していると、正極集電リード板７１に形成された突起部２０と封口体下面を溶接する際に、溶接電極による封口体１２と外装缶底部６２の押圧によって、封口体１２が外装缶底部６２の方向に降下し、集電リード板７１の突起部２０が封口体下面の溝部４０に誘い込まれるようにして嵌合する。これにより、突起部２０の先端が溝部４０に精度よく面接触又は複数点接触する。また、溝部４０は、封口体下面中央を中心とする同心円上に形成されているので、封口体の軸方向に回転に対し、位置決めをする必要が無い。
以上より、集電リード板の突起部２０の先端と溝部４０との接触面積が増加し、集電リード板の突起部２０と封口体下面との溶接強度及び電池のハイレート放電特性が向上する。 The groove portion 40 on the lower surface of the sealing body has a width that decreases from the deepest portion 41 to the opening portion 42, and the outer peripheral portion of the cross section is substantially V-shaped or U-shaped (FIG. 3). When the protruding portion 20 of the current collecting lead and the groove portion 40 on the lower surface of the sealing body have such a structure, welding is performed when the protruding portion 20 formed on the positive electrode current collecting lead plate 71 and the lower surface of the sealing body are welded. By pressing the sealing body 12 and the outer can bottom portion 62 by the electrodes, the sealing body 12 is lowered in the direction of the outer can bottom portion 62 so that the protruding portion 20 of the current collecting lead plate 71 is drawn into the groove portion 40 on the lower surface of the sealing body. And fit. Thereby, the front-end | tip of the projection part 20 carries out a surface contact or multiple point contact with the groove part 40 with sufficient precision. Moreover, since the groove part 40 is formed on the concentric circle centering on the sealing body lower surface center, it is not necessary to position with respect to rotation to the axial direction of a sealing body.
As described above, the contact area between the tip of the protruding portion 20 of the current collecting lead plate and the groove 40 is increased, and the welding strength between the protruding portion 20 of the current collecting lead plate and the lower surface of the sealing body and the high rate discharge characteristics of the battery are improved.
ここで、溝部４０が、最深部４１及びその近傍に断面の外周部分の形状が前記集電リード板の突起の先端の断面の外周部分の形状と略一致する底部領域４３を有するようにしていると（図３（ｂ））、集電リード板の突起部２０の先端が溝部の最深部及びその近傍と密着するので、溶接面積が増加し、集電リード板の突起部と封口体下面との溶接強度及び電池のハイレート放電特性がさらに向上する。 Here, the groove portion 40 has a bottom region 43 in which the shape of the outer peripheral portion of the cross section substantially coincides with the shape of the outer peripheral portion of the tip of the projection of the current collecting lead plate at the deepest portion 41 and in the vicinity thereof. (FIG. 3B), the tip of the projection 20 of the current collector lead plate is in close contact with the deepest portion of the groove and the vicinity thereof, so that the welding area increases, and the projection of the current collector lead plate and the lower surface of the sealing body The welding strength and the high-rate discharge characteristics of the battery are further improved.
また、封口体下面の溝部４０と集電リード板７１の突起部２０の断面の外周部分の形状が、いずれも曲線状であって、封口体下面の溝部４０の表面の極率半径が、集電リード板７１の突起の表面の極率半径より大きくなっているようにすると（図３（ｃ））、集電リード板７１の突起部２０の先端が溝部の最深部及びその近傍と密着するだけでなく、集電リード板の突起２０の先端が封口体下面の溝部４０に誘い込まれやすくなって位置決め精度が向上するので、溶接面積が増加し、集電リード板の突起部と封口体下面との溶接強度及び電池のハイレート放電特性が一層向上する。 Further, the shape of the outer peripheral portion of the cross section of the groove portion 40 on the lower surface of the sealing body and the projection portion 20 of the current collector lead plate 71 is both curved, and the radius of curvature of the surface of the groove portion 40 on the lower surface of the sealing body is If the radius of curvature of the surface of the projection of the electric lead plate 71 is larger than that of the surface of the projection (FIG. 3C), the tip of the projection 20 of the current collector lead plate 71 is in close contact with the deepest portion of the groove and the vicinity thereof. In addition, the leading end of the projection 20 of the current collector lead plate is easily drawn into the groove 40 on the lower surface of the sealing body and positioning accuracy is improved, so that the welding area is increased and the projection portion of the current collector lead plate and the sealing body are increased. The welding strength with the lower surface and the high rate discharge characteristics of the battery are further improved.
一方、封口体下面に溝部を有していないと（図５～６）、溶接電極による封口体１２と外装缶底部６２の押圧によって、封口体１２が外装缶底部６２の方向に降下する際に、集電リード板７１の突起部２０が封口体下面上を横滑りし、封口体下面の所定の位置（例えば、突出部）に溶接されないという不具合が発生する。 On the other hand, if there is no groove on the bottom surface of the sealing body (FIGS. 5 to 6), when the sealing body 12 descends in the direction of the outer can bottom 62 due to the pressing of the sealing body 12 and the outer can bottom 62 by the welding electrode. The problem is that the protruding portion 20 of the current collecting lead plate 71 slides on the lower surface of the sealing body and is not welded to a predetermined position (for example, a protruding portion) on the lower surface of the sealing body.
３．円筒型二次電池の製造方法
　所定のサイズに形成した上記構成の正極板１、負極板２を、セパレータ３を介して巻き回し、電極体４を作製する。この電極体４と、負極集電体５とを外装缶６に収納し、当該外装缶６に所定の電解液を注液する。一方、正極集電体７には絶縁リング８を挿通し、これを電極体４の上に載置するように収納する。このとき集電リード板７１の先端は、絶縁リング８に載置される。 3. Method for Producing Cylindrical Secondary Battery The positive electrode plate 1 and the negative electrode plate 2 having the above-described configuration formed in a predetermined size are wound through a separator 3 to produce an electrode body 4. The electrode body 4 and the negative electrode current collector 5 are housed in an outer can 6, and a predetermined electrolytic solution is injected into the outer can 6. On the other hand, an insulating ring 8 is inserted into the positive electrode current collector 7 and accommodated so as to be placed on the electrode body 4. At this time, the tip of the current collecting lead plate 71 is placed on the insulating ring 8.
　次に封口体１２を外装缶６の開口部に嵌合する。その後電池の上下方向から、封口体１２と外装缶底部６２に溶接電極Ｗ１、Ｗ２を押圧させるように配置し（図４（ａ）を参照）、ダイレクト抵抗溶接を行う。このとき、溶接電極Ｗ１、Ｗ２による封口体１２と外装缶底部６２の押圧によって、封口体１２が外装缶底部６２の方向に降下し、集電リード板７１の突起部２０が封口体下面の溝部４０に誘い込まれるようにして嵌合する。その後は封口体１２周囲についてカシメ封口を行い、電池内部を封止する（図４（ｂ）。　これによって、密閉型電池が完成する。 Next, the sealing body 12 is fitted into the opening of the outer can 6. Thereafter, the welding electrodes W1 and W2 are arranged to be pressed against the sealing body 12 and the outer can bottom 62 from the vertical direction of the battery (see FIG. 4A), and direct resistance welding is performed. At this time, due to the pressing of the sealing body 12 and the outer can bottom 62 by the welding electrodes W1 and W2, the sealing body 12 descends in the direction of the outer can bottom 62, and the protrusion 20 of the current collector lead plate 71 is a groove on the lower surface of the sealing body. 40 so as to be drawn in. After that, caulking sealing is performed around the sealing body 12 to seal the inside of the battery (FIG. 4B). Thus, a sealed battery is completed.
１ 　　正極板
　２ 　　負極板
　３ 　　セパレータ
　４ 　　電極体
　５ 　　負極集電体
　６ 　　外装缶
　７ 　　正極集電体
　８ 　　絶縁リング（ 防振リング或いは正極ワッシャー）
　１ ２ 　　封口体
　６ ２ 　　外装缶底部
　６ ３ 　　くびれ部
　７ ０ 　　本体部
　７ １ 　　タブ DESCRIPTION OF SYMBOLS 1 Positive electrode plate 2 Negative electrode plate 3 Separator 4 Electrode body 5 Negative electrode collector 6 Outer can 7 Positive electrode collector 8 Insulating ring (Anti-vibration ring or positive washer)
1 2 Sealing body 6 2 Exterior can bottom 6 3 Constriction 7 0 Main body 7 1 Tab

Claims (3)

  1. 電池の正・負極外部端子に電流を流すことによって、集電リード板に形成された突起部と封口体下面との接触部分を溶接する円筒型二次電池であって、
    前記封口体下面には、封口体中央を中心とする同心円上に溝部が形成されており、
    前記溝部は、開口部から最深部にかけて幅が減少しており、
    前記集電リード板に形成された突起部の先端が、前記封口体下面の溝部に嵌合して封口体下面に溶接されていることを特徴とすることを特徴とする円筒型二次電池。     A cylindrical secondary battery that welds the contact portion between the protrusion formed on the current collector lead plate and the lower surface of the sealing body by flowing current to the positive and negative external terminals of the battery,
    On the lower surface of the sealing body, a groove is formed on a concentric circle centering on the center of the sealing body,
    The groove has a width that decreases from the opening to the deepest part,
    A cylindrical secondary battery characterized in that a tip of a projection formed on the current collector lead plate is fitted into a groove on the lower surface of the sealing body and welded to the lower surface of the sealing body.
  2. 　前記封口体下面の溝部は、最深部及びその近傍に、断面の外周部分の形状が前記集電リード板の突起の先端の断面の外周部分の形状と略一致する底部領域を有するとともに、
    前記集電リード板の突起の先端が前記底部領域に溶接されていることを特徴とする請求項１に記載の円筒型二次電池。     The groove portion on the lower surface of the sealing body has a bottom region in which the shape of the outer peripheral portion of the cross section substantially coincides with the shape of the outer peripheral portion of the cross section of the tip of the protrusion of the current collecting lead plate at the deepest portion and the vicinity thereof.
    2. The cylindrical secondary battery according to claim 1, wherein a tip of a protrusion of the current collecting lead plate is welded to the bottom region.
  3. 　前記封口体下面の溝部と前記集電リード板の突起の断面の外周部分の形状は、いずれも曲線状であって、前記封口体下面の溝部の表面の極率半径が、前記集電リード板の突起の表面の極率半径より大きくなっていることを特徴とする請求項１～２に記載の円筒型二次電池。 The shape of the groove on the lower surface of the sealing body and the outer peripheral portion of the cross section of the projection of the current collecting lead plate are both curved, and the radius of curvature of the surface of the groove on the lower surface of the sealing body is the current collecting lead plate. 3. The cylindrical secondary battery according to claim 1, wherein the cylindrical secondary battery is larger than the radius of curvature of the surface of the protrusion.
PCT/JP2011/069773 2010-08-31 2011-08-31 Cylindrical secondary battery WO2012029852A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10261397A (en) * 1997-03-17 1998-09-29 Sanyo Electric Co Ltd Manufacture of storage battery
JP2000106165A (en) * 1998-09-28 2000-04-11 Japan Storage Battery Co Ltd Cylindrical battery
JP2005268072A (en) * 2004-03-19 2005-09-29 Sanyo Electric Co Ltd Battery and manufacturing method thereof
JP2006324180A (en) * 2005-05-20 2006-11-30 Matsushita Electric Ind Co Ltd Storage battery and its manufacturing method
JP2007122942A (en) * 2005-10-26 2007-05-17 Matsushita Electric Ind Co Ltd Storage battery
JP2010135304A (en) * 2008-10-31 2010-06-17 Sanyo Electric Co Ltd Cylindrical secondary battery

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10261397A (en) * 1997-03-17 1998-09-29 Sanyo Electric Co Ltd Manufacture of storage battery
JP2000106165A (en) * 1998-09-28 2000-04-11 Japan Storage Battery Co Ltd Cylindrical battery
JP2005268072A (en) * 2004-03-19 2005-09-29 Sanyo Electric Co Ltd Battery and manufacturing method thereof
JP2006324180A (en) * 2005-05-20 2006-11-30 Matsushita Electric Ind Co Ltd Storage battery and its manufacturing method
JP2007122942A (en) * 2005-10-26 2007-05-17 Matsushita Electric Ind Co Ltd Storage battery
JP2010135304A (en) * 2008-10-31 2010-06-17 Sanyo Electric Co Ltd Cylindrical secondary battery

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