JP5590391B2 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
JP5590391B2
JP5590391B2 JP2010167995A JP2010167995A JP5590391B2 JP 5590391 B2 JP5590391 B2 JP 5590391B2 JP 2010167995 A JP2010167995 A JP 2010167995A JP 2010167995 A JP2010167995 A JP 2010167995A JP 5590391 B2 JP5590391 B2 JP 5590391B2
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Prior art keywords
terminal
lid
positive electrode
secondary battery
thin flat
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JP2010167995A
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JP2012028246A5 (en
JP2012028246A (en
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欣也 青田
利郎 藤田
英幸 柴沼
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Hitachi Astemo Ltd
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Hitachi Automotive Systems Ltd
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Priority to JP2010167995A priority Critical patent/JP5590391B2/en
Priority to PCT/JP2011/053971 priority patent/WO2012014510A1/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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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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)
  • Sealing Battery Cases Or Jackets (AREA)

Description

本発明は、リチウム二次電池などの二次電池に関する。   The present invention relates to a secondary battery such as a lithium secondary battery.

近年、ハイブリッド自動車や電気自動車等の動力源として大容量（Ｗｈ）のリチウム二次電池が開発されており、その中でもエネルギー密度（Ｗｈ／ｋｇ）の高い角形のリチウム二次電池が注目されている。   2. Description of the Related Art In recent years, large capacity (Wh) lithium secondary batteries have been developed as power sources for hybrid vehicles, electric vehicles, etc. Among them, prismatic lithium secondary batteries with high energy density (Wh / kg) are attracting attention. .

角形のリチウム二次電池においては、正極活物質を塗布した正極箔、負極活物質を塗布した負極箔およびそれぞれを絶縁するためのセパレータを捲回した扁平形状の捲回群を缶に収納し、蓋に設けられ外部に露出した正極端子および負極端子と捲回群とを電気的に接続する。さらに、缶と蓋を封止溶接し、蓋に設けられた注液口から電解液を注液し、注液栓を挿入してレーザ溶接により封止溶接することで二次電池を作製する。   In a rectangular lithium secondary battery, a positive foil coated with a positive electrode active material, a negative electrode foil coated with a negative electrode active material and a flat wound group in which a separator for insulating each is wound is housed in a can, A positive electrode terminal and a negative electrode terminal which are provided on the lid and are exposed to the outside are electrically connected to the wound group. Further, the can and the lid are sealed and welded, the electrolytic solution is injected from a liquid injection port provided in the lid, a liquid injection stopper is inserted, and sealing welding is performed by laser welding to produce a secondary battery.

特許文献１記載の密封電池では、円筒形状の接続端子が、絶縁部材、蓋、ガスケット、集電板のそれぞれに形成された開口部に挿入され、接続端子の中心軸より外周側に広げて、それぞれの部材をかしめることにより固定し、かしめ部の最外周すべてに薄肉部を設けて、薄肉部と集電板とをレーザ溶接する方法が示されている。   In the sealed battery described in Patent Document 1, the cylindrical connection terminal is inserted into the opening formed in each of the insulating member, the lid, the gasket, and the current collector plate, and spreads from the central axis of the connection terminal to the outer peripheral side. A method is shown in which each member is fixed by caulking, a thin part is provided on the outermost periphery of the caulking part, and the thin part and the current collector plate are laser-welded.

特開２００９−８７６９３号公報JP 2009-87693 A

特許文献１の密封電池は、かしめによりそれぞれの部材を固定しており、かしめ部の周縁部は、レーザ溶接の品質を確保するために、薄肉化される。このため、かしめ強度、すなわちそれぞれの部材を固定する強度が低下するおそれがあった。   In the sealed battery of Patent Document 1, each member is fixed by caulking, and the peripheral portion of the caulking portion is thinned to ensure the quality of laser welding. For this reason, there is a possibility that the caulking strength, that is, the strength for fixing each member may be lowered.

請求項１の発明による二次電池は、電力を充放電する捲回群と、開口部を有し、前記捲回群が収納される缶と、前記缶の開口部に溶接されて、前記開口部を封止する蓋と、前記捲回群に電気的に接続され、かつ前記蓋を貫通して、前記蓋の外側に突出する正極接続端子および負極接続端子と、前記蓋の外側で、前記正極接続端子および前記負極接続端子に、それぞれ接続された正極外部端子および負極外部端子と、前記正極外部端子および前記負極外部端子を前記蓋に対して電気的に絶縁する絶縁部材と、前記正極接続端子および前記負極接続端子と、前記蓋との隙間をシールするガスケットとを備え、前記正極接続端子および前記負極接続端子には、前記蓋の外側で拡径されたかしめ部が形成され、前記正極外部端子および前記負極外部端子のそれぞれには、前記蓋に沿って、前記かしめ部が接続される部分と、バスバーが接続されるバスバー接続部とが並んで設けられ、前記かしめ部の周縁部には、レーザスポット溶接可能な薄肉平坦部が局所的に形成され、前記正極接続端子のかしめ部における前記薄肉平坦部は、前記正極外部端子のバスバー接続部の対向側にのみ形成され、前記負極接続端子のかしめ部における前記薄肉平坦部は、前記負極外部端子のバスバー接続部の対向側にのみ形成され、前記薄肉平坦部がレーザスポット溶接されていることを特徴とする。 The secondary battery according to the invention of claim 1 includes a wound group for charging / discharging electric power, an opening, a can in which the wound group is stored, and an opening of the can that is welded to the opening. A lid that seals the portion, a positive electrode connection terminal and a negative electrode connection terminal that are electrically connected to the winding group and project outside the lid through the lid, and outside the lid, A positive external terminal and a negative external terminal connected to the positive connection terminal and the negative connection terminal, respectively, an insulating member that electrically insulates the positive external terminal and the negative external terminal from the lid, and the positive connection A terminal and the negative electrode connection terminal, and a gasket that seals a gap between the lid and the positive electrode connection terminal and the negative electrode connection terminal are formed with a caulked portion whose diameter is increased outside the lid, and the positive electrode External terminal and negative electrode external end Each of said along the lid, the portion in which the caulked portion is connected, the bus bar is provided alongside the bus bar connecting portion to be connected, a peripheral portion of the caulking portion is capable laser spot welding A thin flat portion is locally formed, and the thin flat portion in the caulking portion of the positive electrode connection terminal is formed only on the opposite side of the bus bar connection portion of the positive electrode external terminal, and the thin wall in the caulking portion of the negative electrode connection terminal. The flat portion is formed only on the opposite side of the bus bar connecting portion of the negative external terminal, and the thin flat portion is laser spot welded.

本発明によれば、良好な溶接品質と、高いかしめ強度を得ることができる。   According to the present invention, good weld quality and high caulking strength can be obtained.

本発明による二次電池の第１実施形態における捲回群を示す分解斜視図。1 is an exploded perspective view showing a winding group in a first embodiment of a secondary battery according to the present invention. 図１の捲回群を組み付けた蓋組立体を示す斜視図。The perspective view which shows the lid | cover assembly which assembled | attached the winding group of FIG. 図２の蓋組立体を組み付けた二次電池を示す斜視図。The perspective view which shows the secondary battery which assembled | attached the cover assembly of FIG. 図２の蓋組立体のための蓋・端子組立体の組立て前の状態を示す部分分解斜視図。The partial exploded perspective view which shows the state before the assembly of the lid | cover and terminal assembly for the lid | cover assembly of FIG. 図４の蓋・端子組立体の部品組み付け後、かしめ工程前の状態を示す縦断面図。The longitudinal cross-sectional view which shows the state before the crimping process after components assembly | attachment of the lid | cover and terminal assembly of FIG. 図５の蓋・端子組立体の１回目のかしめ工程を示す縦断面図。FIG. 6 is a longitudinal sectional view showing a first caulking step of the lid / terminal assembly of FIG. 5. 図６の蓋・端子組立体の２回目のかしめ工程を示す縦断面図。FIG. 7 is a longitudinal sectional view showing a second caulking step of the lid / terminal assembly of FIG. 6. 図７の蓋・端子組立体の３回目のかしめ工程を示す縦断面図。FIG. 8 is a longitudinal sectional view showing a third caulking step of the lid / terminal assembly of FIG. 7. 図８の蓋・端子組立体のかしめ工程後の状態を示す斜視図。The perspective view which shows the state after the crimping process of the lid | cover and terminal assembly of FIG. 図８の蓋・端子組立体に溶接工程を実施した状態を示す斜視図。The perspective view which shows the state which implemented the welding process to the lid | cover and terminal assembly of FIG. 図１０の縦断面図。The longitudinal cross-sectional view of FIG. 図１０の溶接工程後の蓋・端子組立体を示す斜視図。The perspective view which shows the lid | cover and terminal assembly after the welding process of FIG. 本発明による二次電池の第２実施形態における蓋・端子組立体を示す斜視図。The perspective view which shows the lid | cover and terminal assembly in 2nd Embodiment of the secondary battery by this invention. 本発明による二次電池の第３実施形態における蓋・端子組立体を示す斜視図。The perspective view which shows the lid | cover and terminal assembly in 3rd Embodiment of the secondary battery by this invention. 本発明による二次電池の第４実施形態における、蓋・端子組立体の３回目のかしめ工程後の状態を示す斜視図。The perspective view which shows the state after the 3rd crimping process of the lid | cover and terminal assembly in 4th Embodiment of the secondary battery by this invention. 図１５の蓋・端子組立体における溶接工程後の状態を示す斜視図。The perspective view which shows the state after the welding process in the lid | cover and terminal assembly of FIG.

本発明による二次電池の実施形態を図面を参照して説明する。   An embodiment of a secondary battery according to the present invention will be described with reference to the drawings.

［第１実施形態］
［全体構成］
図３に示すように、二次電池１００は、缶３３に蓋組立体３５を挿入した後に、缶３３を密封して構成される。蓋組立体３５は、図2に示すように、蓋・端子組立体２００に捲回群６を組み付けたもので、蓋・端子組立体２００は、図１２に示すように、蓋１１に、正負極外部端子１３、３２および正負極集電板１４、３１を装着したものである。蓋１１には、注液口１１ｂが設けられ、缶３３の密封後、注液口１１ｂから缶３３内に電解液（図示省略）が注入され、その後、注液口１１ｂには注液栓３４が封止溶接される。 [First Embodiment]
[overall structure]
As shown in FIG. 3, the secondary battery 100 is configured by sealing the can 33 after inserting the lid assembly 35 into the can 33. As shown in FIG. 2, the lid assembly 35 is obtained by assembling the winding group 6 to the lid / terminal assembly 200. The lid / terminal assembly 200 is attached to the lid 11 as shown in FIG. The negative external terminals 13 and 32 and the positive and negative current collecting plates 14 and 31 are mounted. The lid 11 is provided with a liquid injection port 11b. After sealing the can 33, an electrolyte (not shown) is injected into the can 33 from the liquid injection port 11b. Are sealed and welded.

正負極外部端子１３、３２には、貫通孔１３ｂ、３２ｂが設けられ、貫通孔１３ｂ、３２ｂに挿通されたボルト（図示省略）によって、正負極外部端子１３、３２はバスバー（図示省略）に接続される。蓋１１は、その周縁部が缶３３に溶接され、これによって缶３が封止される。   The positive and negative external terminals 13 and 32 are provided with through holes 13b and 32b, and the positive and negative external terminals 13 and 32 are connected to a bus bar (not shown) by bolts (not shown) inserted through the through holes 13b and 32b. Is done. The peripheral edge of the lid 11 is welded to the can 33, whereby the can 3 is sealed.

［蓋組立体］
図２に示すように、蓋組立体３５は、蓋・端子組立体２００と、蓋・端子組立体２００における正負極集電板１４、３１に接続された捲回群６とで構成されている。正負極集電板１４、３１は、捲回群６の両端に露出する正負極箔１、３に溶接されている。 [Lid assembly]
As shown in FIG. 2, the lid assembly 35 includes a lid / terminal assembly 200 and a wound group 6 connected to the positive and negative current collector plates 14, 31 in the lid / terminal assembly 200. . The positive and negative current collector plates 14 and 31 are welded to the positive and negative electrode foils 1 and 3 exposed at both ends of the wound group 6.

正負極集電板１４、３１には、溶接部２０において、正負極接続端子１５、１６がそれぞれ溶接され、正負極接続端子１５、１６は、内側から蓋１１を貫通して、外部に突出している。正負極接続端子１５、１６には、蓋１１の外面で、正負極外部端子１３、３２が取りつけられている。蓋・端子組立体２００、特に、正負極集電板１４、３１および正負極外部端子１３、３２の蓋１１への取りつけ方法の詳細は後述する。   The positive and negative electrode current collector plates 14 and 31 are welded with positive and negative electrode connection terminals 15 and 16, respectively, in the welded portion 20, and the positive and negative electrode connection terminals 15 and 16 project from the inside through the lid 11 and project outside. Yes. Positive and negative electrode external terminals 13 and 32 are attached to the positive and negative electrode connection terminals 15 and 16 on the outer surface of the lid 11. Details of the method of attaching the lid / terminal assembly 200, in particular, the positive and negative current collecting plates 14 and 31, and the positive and negative external terminals 13 and 32 to the lid 11 will be described later.

［捲回群］
図１に示すように、捲回群６は、セパレータ５を挟んで正極箔１と負極箔３とを扁平形状に捲回して構成されている。正極箔１は厚さ３０μｍのアルミニウムであり、負極箔３は厚さ１５μｍの銅である。また、セパレータ５は多孔質のポリエチレン樹脂である。正極箔１の両面には正極活物質２が塗布されており、負極箔３の両面には負極活物質４が塗布されている。捲回群６の正極活物質２と負極活物質４との間で電力を充放電する。 [Turn-up group]
As shown in FIG. 1, the wound group 6 is configured by winding the positive foil 1 and the negative foil 3 in a flat shape with the separator 5 interposed therebetween. The positive foil 1 is 30 μm thick aluminum, and the negative foil 3 is 15 μm thick copper. The separator 5 is a porous polyethylene resin. A positive electrode active material 2 is applied to both surfaces of the positive electrode foil 1, and a negative electrode active material 4 is applied to both surfaces of the negative electrode foil 3. Electric power is charged and discharged between the positive electrode active material 2 and the negative electrode active material 4 of the wound group 6.

［蓋・端子組立体］
図２〜図１２を参照して蓋・端子組立体２００について詳細に説明する。
とくに図１２に示すように、蓋・端子組立体２００は、蓋１１と、正負極集電板１４、３１と、正負極接続端子１５、１６と、ガスケット１０と、絶縁部材１２と、正負極外部端子１３、３２とを備え、後述する工程で一体化されている。正負極集電板１４、３１は、捲回群６の軸方向両端部の側面形状に沿って折曲された金属板であり、正負極箔１、３の材質と同じ、アルミニウム、銅よりなる。 [Lid and terminal assembly]
The lid / terminal assembly 200 will be described in detail with reference to FIGS.
In particular, as shown in FIG. 12, the lid / terminal assembly 200 includes a lid 11, positive and negative current collector plates 14 and 31, positive and negative electrode connection terminals 15 and 16, a gasket 10, an insulating member 12, and positive and negative electrodes. External terminals 13 and 32 are provided, and are integrated in a process described later. The positive and negative current collector plates 14 and 31 are metal plates that are bent along the side surface shape of both end portions in the axial direction of the wound group 6, and are made of the same material as the positive and negative electrode foils 1 and 3, and are made of aluminum and copper. .

以下、正極側の構成について説明する。
図４、５に示されるように、正極集電板１４と正極接続端子１５は予め溶接部２０にて一体化されている。蓋１１には、正極接続端子１５を挿通する貫通孔１１ａが穿設されている。正極接続端子１５は、貫通孔１１ａに挿入されて蓋１１の外側に突出する軸部１５ａと、軸部よりも大径の頭部１５ｆとを有する。正極接続端子１５は、軸部１５ａにガスケット１０を嵌装した状態で貫通孔１１ａに挿入され、蓋・端子組立体２００が製作された後、ガスケット１０は頭部１５ｆによって蓋１１の内面に圧接される。すなわち、ガスケット１０には貫通孔１０ａが穿設され、正極接続端子１５の軸部１５ａは貫通孔１０ａに挿入され、蓋１１の下面側から軸部１５ａが蓋１１の貫通孔１１ａを貫通している。貫通後は、ガスケット１０に頭部１５ｆが圧接され、正極接続端子１５と蓋１１の隙間がシールされる。 Hereinafter, the configuration on the positive electrode side will be described.
As shown in FIGS. 4 and 5, the positive electrode current collector plate 14 and the positive electrode connection terminal 15 are integrated in advance by a weld 20. The lid 11 has a through hole 11a through which the positive electrode connection terminal 15 is inserted. The positive electrode connection terminal 15 has a shaft portion 15a that is inserted into the through hole 11a and protrudes to the outside of the lid 11, and a head portion 15f having a larger diameter than the shaft portion. The positive electrode connection terminal 15 is inserted into the through hole 11a with the gasket 10 fitted to the shaft portion 15a, and after the lid / terminal assembly 200 is manufactured, the gasket 10 is pressed against the inner surface of the lid 11 by the head 15f. Is done. That is, a through hole 10 a is formed in the gasket 10, the shaft portion 15 a of the positive electrode connection terminal 15 is inserted into the through hole 10 a, and the shaft portion 15 a penetrates the through hole 11 a of the lid 11 from the lower surface side of the lid 11. Yes. After the penetration, the head portion 15f is pressed into contact with the gasket 10, and the gap between the positive electrode connection terminal 15 and the lid 11 is sealed.

図４、５に示されるように、正極接続端子１５の軸部１５ａには、蓋１１の外側で、絶縁部材１２を介して正負極外部端子１３が嵌装され、その後、軸部１５ａには、かしめ工程および溶接工程が施される。これによって、正極接続端子１５の軸部１５ａは、蓋１１に対して電気的に絶縁されつつ、正極外部端子１３に電気的に接続される。   As shown in FIGS. 4 and 5, the shaft portion 15a of the positive electrode connection terminal 15 is fitted with the positive and negative electrode external terminals 13 through the insulating member 12 outside the lid 11, and then the shaft portion 15a has the shaft portion 15a. A caulking process and a welding process are performed. As a result, the shaft portion 15 a of the positive electrode connection terminal 15 is electrically connected to the positive electrode external terminal 13 while being electrically insulated from the lid 11.

［かしめ工程］
蓋・端子組立体２００の３段階のかしめ工程を、正極側を例にとり、詳述する。 [Caulking process]
The three-step caulking process of the lid / terminal assembly 200 will be described in detail by taking the positive electrode side as an example.

［１回目のかしめ工程］
図５に示すように、軸部１５ａの先端部は筒状部１５ｂとされ、先端に向かって開口する有底穴１５ｇが形成されている。
図６に示すように、３段階のうちの１回目のかしめ工程では、平面的な金型２１で頭部１５ｆが支持された状態で、有底穴１５ｇに先端円錐形状の金型２２が圧入される。これにより、筒状部１５ｂが押し拡げられる。こうして、正極集電板１４、ガスケット１０、正極外部端子１３、絶縁部材１２が蓋１１に対して仮止めされる。 [First caulking process]
As shown in FIG. 5, the tip portion of the shaft portion 15a is a cylindrical portion 15b, and a bottomed hole 15g that opens toward the tip is formed.
As shown in FIG. 6, in the first caulking process among the three stages, the tip-shaped conical mold 22 is press-fitted into the bottomed hole 15g with the head 15f supported by the planar mold 21. Is done. Thereby, the cylindrical part 15b is expanded. Thus, the positive electrode current collector plate 14, the gasket 10, the positive electrode external terminal 13, and the insulating member 12 are temporarily fixed to the lid 11.

［２回目のかしめ工程］
図７に示すように、２回目のかしめ工程では、平面的な金型２３で頭部１５ｆが支持された状態で、筒状部１５ｂに、先端に環状溝２４ａが形成された金型２４が押圧される。このとき、環状溝２４ａ内で筒状部１５ｂが略円盤状に押し拡げられ、拡径されることによって、略円盤状のかしめ部１５ｄが形成される。これによって、正極集電板１４、ガスケット１０、正極外部端子１３、絶縁部材１２が蓋１１に対して締め付け固定され、一体化される。 [Second caulking process]
As shown in FIG. 7, in the second caulking step, the mold 24 having the annular groove 24a formed at the tip is formed in the cylindrical portion 15b with the head 15f supported by the planar mold 23. Pressed. At this time, the cylindrical portion 15b is pushed and expanded in a substantially disk shape within the annular groove 24a, and the diameter thereof is expanded, thereby forming a substantially disk-shaped caulking portion 15d. As a result, the positive electrode current collector plate 14, the gasket 10, the positive electrode external terminal 13, and the insulating member 12 are fastened and fixed to the lid 11 and integrated.

［３回目のかしめ工程］
図８に示すように、３回目のかしめ工程では、平面的な金型２５で頭部１５ｆが支持された状態で、かしめ部１５ｄの周縁に、金型２４を圧接する。金型２４は、先端に複数（例えば、円周方向に均等に４個）の円形の突起部２６ａが形成されており、かしめ部１５ｄの周縁部に、突起部２６ａによる円形の圧痕（薄肉平坦部）１５ｅが等間隔に４つ形成される。 [The third caulking process]
As shown in FIG. 8, in the third caulking step, the die 24 is pressed against the periphery of the caulking portion 15d while the head 15f is supported by the flat die 25. The mold 24 has a plurality of (for example, four in the circumferential direction) circular protrusions 26a formed at the tip, and a circular indentation (thin flat surface) formed by the protrusions 26a on the peripheral edge of the caulking part 15d. Part) 15e are formed at equal intervals.

図９に示すように、薄肉平坦部１５ｅは、レーザスポット溶接によって必要充分な強度で軸部１５ａが正極外部端子１３に固着されるように、最小限の面積、個数に設定される。したがって、薄肉平坦部１５ｅは局所的、間欠的に形成される。薄肉平坦部１５ｅは、かしめ部１５ｄの周縁部全周には形成されないので、薄肉になっていない部分が残り、かしめ部１５ｄ全体としてのかしめ強度は高い。   As shown in FIG. 9, the thin flat portions 15e are set to a minimum area and number so that the shaft portion 15a is fixed to the positive electrode external terminal 13 with a necessary and sufficient strength by laser spot welding. Therefore, the thin flat portion 15e is locally and intermittently formed. Since the thin flat portion 15e is not formed around the entire periphery of the caulking portion 15d, a portion that is not thin remains and the caulking strength of the entire caulking portion 15d is high.

車載用のリチウム二次電池では、使用中に振動荷重および衝撃荷重が電池に作用する。特に、組電池を構成した際に、正極外部端子１３は隣の単電池とバスバーにより接続されるため、正極外部端子１３のかしめ部１５ｄには大きな荷重が作用する。本実施形態は、かしめ部１５ｄの強度を高めることにより、このような荷重に耐え得る組電池を構成することができる。   In a vehicle-mounted lithium secondary battery, vibration load and impact load act on the battery during use. In particular, when the assembled battery is configured, since the positive electrode external terminal 13 is connected to the adjacent unit cell by the bus bar, a large load acts on the caulking portion 15 d of the positive electrode external terminal 13. In the present embodiment, an assembled battery that can withstand such a load can be configured by increasing the strength of the caulking portion 15d.

［溶接工程］
３段階のかしめ工程を経た蓋・端子組立体２００は、まず、正極側の溶接を行う。
図１０、図１１に示すように、レーザ溶接により、正極接続端子１５と正極外部端子１３とが電気的に接続され、薄肉平坦部１５eに溶接部３０が形成される。前述のとおり、かしめ部１５ｄは充分なかしめ強度を有するので、溶接で溶着強度に配慮する必要はない。 [Welding process]
The lid / terminal assembly 200 that has undergone the three-step caulking process is first welded on the positive electrode side.
As shown in FIGS. 10 and 11, the positive electrode connection terminal 15 and the positive electrode external terminal 13 are electrically connected by laser welding, and a welded portion 30 is formed in the thin flat portion 15e. As described above, since the caulking portion 15d has a sufficient caulking strength, it is not necessary to consider the welding strength by welding.

レーザ溶接は、複数箇所（４カ所）の薄肉平坦部１５eにレーザを照射し、薄肉平坦部１５eと正極外部端子１３とを溶接する。なお、溶接箇所である薄肉平坦部１５eの数量、溶接面積などは二次電池の充放電時の電気的特性に基づき決定される。薄肉平坦部１５eが多ければ、薄肉平坦部１５eと正極外部端子１３との接続抵抗を低減することができる。レーザ溶接は、例えば、ＹＡＧレーザ溶接機を用い、２０Jのパルスエネルギーでスポット溶接する。また、溶接部のみを局部的にプレスするので薄肉平端部１５eと正極外部端子１３との間の隙間がなくなり溶接品質が向上する効果もある。   In the laser welding, a plurality of (four) thin flat portions 15e are irradiated with laser, and the thin flat portions 15e and the positive external terminal 13 are welded. In addition, the quantity of the thin flat part 15e which is a welding location, a welding area, etc. are determined based on the electrical property at the time of charging / discharging of a secondary battery. If there are many thin flat parts 15e, the connection resistance of the thin flat part 15e and the positive electrode external terminal 13 can be reduced. For laser welding, for example, a YAG laser welding machine is used and spot welding is performed with a pulse energy of 20 J. In addition, since only the welded portion is pressed locally, there is no gap between the thin flat end portion 15e and the positive electrode external terminal 13, and the welding quality is improved.

正極側の正極接続端子１５はアルミニウム製であるため、薄肉平坦部１５eはレーザ光に対する反射率が高い。レーザ光の吸収率を高くするためには、薄肉平坦部１５eに対して垂直にレーザ光を入射する必要があり、薄肉平坦部１５eの傾斜を最小とし、できるだけ平坦な面とすることが望ましい。   Since the positive electrode connection terminal 15 on the positive electrode side is made of aluminum, the thin flat portion 15e has a high reflectance with respect to the laser beam. In order to increase the absorption rate of the laser beam, it is necessary to make the laser beam incident on the thin flat portion 15e perpendicularly, and it is desirable to minimize the inclination of the thin flat portion 15e and make the surface as flat as possible.

溶接部３０の近傍には絶縁部材１２が配置されるが、絶縁部材１２は樹脂製で融点が低い。このため、できるだけ少ないエネルギーで溶接を実施し、絶縁部材１２の溶融を防止する必要がある。溶接エネルギーを低減するには、薄肉平坦部１５eをできるだけ薄くすればよい。本実施形態では、薄肉平坦部１５eの厚さを０．３ｍｍとして、良好な結果を得た。   Although the insulating member 12 is disposed in the vicinity of the welded portion 30, the insulating member 12 is made of resin and has a low melting point. For this reason, it is necessary to perform welding with as little energy as possible to prevent the insulating member 12 from melting. In order to reduce the welding energy, the thin flat portion 15e may be made as thin as possible. In the present embodiment, a good result was obtained by setting the thickness of the thin flat portion 15e to 0.3 mm.

正極側の溶接の完了後、負極側の溶接を行う。
負極側は、正極側と同様、ガスケット１０、蓋１１、絶縁部材１２および負極外部端子３２を負極接続端子１６によりかしめ固定した後、レーザによるスポット溶接で、負極接続端子１６と負極外部端子３２とを溶接する。負極接続端子１６と負極外部端子３２はいずれも銅製であるため、レーザに対する反射率がアルミニウムより低く、例えば、５０Ｊのエネルギーでスポット溶接する。 After completion of the positive electrode side welding, the negative electrode side welding is performed.
On the negative electrode side, the gasket 10, the lid 11, the insulating member 12, and the negative electrode external terminal 32 are caulked and fixed by the negative electrode connection terminal 16, and then the negative electrode connection terminal 16 and the negative electrode external terminal 32 are spot welded by laser. Weld. Since both the negative electrode connection terminal 16 and the negative electrode external terminal 32 are made of copper, the laser reflectivity is lower than that of aluminum, and for example, spot welding is performed with an energy of 50 J.

［第２実施形態］
本発明による二次電池の第２実施形態を図１３を参照して説明する。なお、図中、第１実施形態と同一もしくは相当部分には同一符号を付し、相違点を主に説明する。
第２実施形態の二次電池は、薄肉平坦部の個数を第１実施形態の二次電池よりも少数の３個としたものである。 [Second Embodiment]
A second embodiment of the secondary battery according to the present invention will be described with reference to FIG. In the figure, the same or corresponding parts as those in the first embodiment are designated by the same reference numerals, and the differences will be mainly described.
In the secondary battery of the second embodiment, the number of thin flat portions is three, which is a smaller number than the secondary battery of the first embodiment.

図１３に示すように、第１実施形態の正極接続端子１５と同様に、正極接続端子１７の軸部１７ａに対して、第１実施形態の１回目、２回目のかしめ工程と同様のかしめ工程を実施する。
３回目のかしめ工程では、軸部１７ａに形成されたかしめ部１７ｄに対して、３個の薄肉平坦部１７ｅを形成し、さらに、第１実施形態と同様の溶接工程によって、薄肉平坦部１７eに溶接部３０を形成する。 As shown in FIG. 13, like the positive electrode connection terminal 15 of the first embodiment, the caulking process similar to the first and second caulking processes of the first embodiment is performed on the shaft portion 17a of the positive electrode connection terminal 17. To implement.
In the third caulking step, three thin flat portions 17e are formed on the caulking portion 17d formed on the shaft portion 17a, and further, the thin flat portion 17e is formed by a welding step similar to the first embodiment. A weld 30 is formed.

溶接部３０は、かしめ部１７ｄの円周角１８０度の範囲に、円周角９０度ごとに配列され、溶接部３０の配列範囲は、正極外部端子１３における貫通孔１３ｂに対向している。上述したように、貫通孔１３ｂにはバスバーが接続される。捲回群６が電力を充放電する場合に、電流は正極接続端子１５と正極集電板１４を通るが、このとき、溶接部３０から貫通孔１３ｂに向かう電流パスＣＦが形成される。この電流パスＣＦは、３つの溶接部３０を、かしめ部１７ｄにおける貫通孔１３ｂに対向する側に配列することによって、最短となり、接続抵抗が低減される。   The welded portion 30 is arranged at a circumferential angle of 180 degrees of the caulking portion 17 d at every circumferential angle of 90 degrees, and the arrangement range of the welded portion 30 faces the through hole 13 b in the positive electrode external terminal 13. As described above, the bus bar is connected to the through hole 13b. When the winding group 6 charges and discharges electric power, the current passes through the positive electrode connection terminal 15 and the positive electrode current collector plate 14. At this time, a current path CF from the welded portion 30 toward the through hole 13 b is formed. This current path CF is the shortest and the connection resistance is reduced by arranging the three welds 30 on the side facing the through hole 13b in the caulking part 17d.

なお、溶接部３０の範囲を、より狭い円周角の範囲として、すべての溶接部３０を、貫通孔１３ｂにより近接させれば、電気抵抗はさらに低減される。但し、かしめ部１７ｄの配置の偏りが大きくなり、かしめ強度に関して不利となる可能性がある。   In addition, if the range of the welding part 30 is made into the range of a narrower circumference angle and all the welding parts 30 are brought closer to the through-hole 13b, an electrical resistance will be reduced further. However, the bias of the caulking portion 17d is increased, which may be disadvantageous with respect to the caulking strength.

本実施形態は、第１実施形態の効果に加え、溶接工程の製造コストを低減し得るという効果を奏する。   In addition to the effects of the first embodiment, this embodiment has an effect that the manufacturing cost of the welding process can be reduced.

［第３実施形態］
本発明による二次電池の第３実施形態を図１４を参照して説明する。なお、図中、第１、第２実施形態と同一もしくは相当部分には同一符号を付し、相違点を主に説明する。
第３実施形態は、薄肉平坦部の個数を第１実施形態よりも少数の１個としたものである。 [Third Embodiment]
A third embodiment of the secondary battery according to the present invention will be described with reference to FIG. In the figure, the same or corresponding parts as those in the first and second embodiments are denoted by the same reference numerals, and differences will be mainly described.
In the third embodiment, the number of thin flat portions is one, which is a smaller number than in the first embodiment.

図１３に示すように、第１実施形態の正極接続端子１５と同様の、正極接続端子１７の軸部１７ａに対して、第１実施形態の１回目、２回目のかしめ工程と同様のかしめ工程を実施する。
３回目のかしめ工程では、軸部１７ａに形成されたかしめ部１７ｄに対して、１個の薄肉平坦部１７ｅを形成し、さらに、第１実施形態と同様の溶接工程によって、薄肉平坦部１７eに溶接部３０を形成する。 As shown in FIG. 13, the same caulking process as the first caulking process of the first embodiment with respect to the shaft portion 17a of the positive electrode connecting terminal 17 similar to the positive electrode connecting terminal 15 of the first embodiment. To implement.
In the third caulking step, one thin flat portion 17e is formed on the caulking portion 17d formed on the shaft portion 17a, and further, the thin flat portion 17e is formed by a welding step similar to that of the first embodiment. A weld 30 is formed.

溶接部３０は、かしめ部１７ｄにおける貫通孔１３ｂに最も近い位置に配置され、電流パスＣＦは最短である。本実施形態は、第１実施形態の効果に加え、最小限の溶接工程コストにより、電気抵抗を最小化するという効果が得られる。   The welded portion 30 is disposed at a position closest to the through hole 13b in the caulking portion 17d, and the current path CF is the shortest. In addition to the effects of the first embodiment, the present embodiment provides the effect of minimizing electrical resistance with a minimum welding process cost.

［第４実施形態］
本発明による二次電池の第４実施形態を図１５、図１６を参照して説明する。なお、図中、第１、第２実施形態と同一もしくは相当部分には同一符号を付し、相違点を主に説明する。
第４実施形態は、第２実施形態と同様の溶接部配列において、薄肉平坦部の形状を楕円形としたものである。 [Fourth Embodiment]
A fourth embodiment of the secondary battery according to the present invention will be described with reference to FIGS. In the figure, the same or corresponding parts as those in the first and second embodiments are denoted by the same reference numerals, and differences will be mainly described.
In the fourth embodiment, the thin flat portion has an elliptical shape in the same welded portion arrangement as that of the second embodiment.

図１５に示すように、第１実施形態の正極接続端子１５と同様の、正極外部端子１７の軸部１７ａに対して、第１実施形態の１回目、２回目のかしめ工程と同様のかしめ工程を実施する。
３回目のかしめ工程では、軸部１７ａに形成されたかしめ部１７ｄに対して、３個の楕円形の薄肉平坦部１７ｆを形成する。３回目のかしめ工程では、先端に３個の楕円形の突起部２６ａが形成された金型２６（図８参照）を使用する。その後、第１実施形態と同様の溶接工程によって、薄肉平坦部１７ｆに楕円形の溶接部３０を形成する。 As shown in FIG. 15, the same caulking process as the first caulking process of the first embodiment with respect to the shaft portion 17a of the positive electrode external terminal 17 similar to the positive electrode connecting terminal 15 of the first embodiment. To implement.
In the third caulking step, three oval thin flat portions 17f are formed on the caulking portion 17d formed on the shaft portion 17a. In the third caulking step, a mold 26 (see FIG. 8) having three elliptical protrusions 26a formed at the tip is used. Thereafter, an elliptical welded portion 30 is formed on the thin flat portion 17f by the same welding process as in the first embodiment.

溶接部３０を楕円形とすることによって、溶接部３０における溶接面積が増加し、電気抵抗を低減する上で有効である。
本実施形態は、第１実施形態の効果に加え、溶接工程の製造コストを低減でき、かつ電気抵抗が比較的小さいという効果を奏する。 By making the welded portion 30 elliptical, the weld area at the welded portion 30 increases, which is effective in reducing electrical resistance.
In addition to the effects of the first embodiment, this embodiment has the effects that the manufacturing cost of the welding process can be reduced and the electrical resistance is relatively small.

［変形例］
第２、第３実施形態では、溶接部３０の位置を、貫通孔１３ｂに面した側、あるいは近接した位置に配置したが、他の電池との接続手段として、溶接ボルトその他の手段が採用されていた場合には、溶接部３０はこの接続手段に面した側、あるいは近接した位置に配置するのがよい。 [Modification]
In the second and third embodiments, the position of the welded portion 30 is arranged on the side facing the through hole 13b or in a close position, but welding bolts and other means are adopted as means for connecting to other batteries. In such a case, it is preferable to arrange the welded portion 30 on the side facing the connecting means or on a close position.

以上説明した二次電池は一例であり、本発明は上記実施形態や変形例に限定されない。   The secondary battery described above is an example, and the present invention is not limited to the above-described embodiments and modifications.

１：正極箔
２：正極活物質
３：負極箔
４：負極活物質
５：セパレータ
６：捲回群
１０：ガスケット
１０a：貫通孔
１１：蓋
１１a：貫通孔
１１ｂ：注液口
１２：絶縁部材
１２a：貫通孔
１３：正極外部端子
１３a：貫通孔
１３b：貫通孔
１４：正極集電板
１５：正極接続端子
１５a：軸部
１５b：筒状部
１５d：かしめ部
１５e：薄肉平坦部
１５ｆ：頭部
１５ｇ：有底穴
１６：負極接続端子
１７：正極接続端子
１７a：軸部
１７ｄ：かしめ部
１７ｆ：薄肉平坦部
３０：溶接部
２１：金型
２２：金型
２３：金型
２４：金型
２４ａ：環状溝
２５：金型
２６：金型
２６ａ：突起部
３１：負極集電板
３２：負極外部端子
３２ｂ：貫通孔
３３：缶
３４：注液栓
３５：蓋組立体
１００：二次電池
２００：蓋・端子組立体 1: Positive electrode foil 2: Positive electrode active material 3: Negative electrode foil 4: Negative electrode active material 5: Separator 6: Winding group 10: Gasket 10a: Through hole 11: Lid 11a: Through hole 11b: Injection port 12: Insulating member 12a : Through-hole 13: positive electrode external terminal 13a: through-hole 13b: through-hole 14: positive electrode current collector plate 15: positive electrode connection terminal 15a: shaft portion 15b: cylindrical portion 15d: caulking portion 15e: thin flat portion 15f: head portion 15g : Bottomed hole 16: Negative electrode connection terminal 17: Positive electrode connection terminal 17 a: Shaft part 17 d: Caulking part 17 f: Thin flat part 30: Welded part 21: Mold 22: Mold 23: Mold 24: Mold 24 a: Annular Groove 25: Mold 26: Mold 26a: Projection 31: Negative electrode current collector plate 32: Negative electrode external terminal 32b: Through hole 33: Can 34: Injection plug 35: Lid assembly 100: Secondary battery 200: Lid Terminal assembly

Claims (5)

電力を充放電する捲回群と、
開口部を有し、前記捲回群が収納される缶と、
前記缶の開口部に溶接されて、前記開口部を封止する蓋と、
前記捲回群に電気的に接続され、かつ前記蓋を貫通して、前記蓋の外側に突出する正極接続端子および負極接続端子と、
前記蓋の外側で、前記正極接続端子および前記負極接続端子に、それぞれ接続された正極外部端子および負極外部端子と、
前記正極外部端子および前記負極外部端子を前記蓋に対して電気的に絶縁する絶縁部材と、
前記正極接続端子および前記負極接続端子と、前記蓋との隙間をシールするガスケットとを備え、
前記正極接続端子および前記負極接続端子には、前記蓋の外側で拡径されたかしめ部が形成され、
前記正極外部端子および前記負極外部端子のそれぞれには、前記蓋に沿って、前記かしめ部が接続される部分と、バスバーが接続されるバスバー接続部とが並んで設けられ、
前記かしめ部の周縁部には、レーザスポット溶接可能な薄肉平坦部が局所的に形成され、
前記正極接続端子のかしめ部における前記薄肉平坦部は、前記正極外部端子のバスバー接続部の対向側にのみ形成され、
前記負極接続端子のかしめ部における前記薄肉平坦部は、前記負極外部端子のバスバー接続部の対向側にのみ形成され、
前記薄肉平坦部がレーザスポット溶接されていることを特徴とする二次電池。 A winding group for charging and discharging power;
A can having an opening and storing the wound group;
A lid welded to the opening of the can to seal the opening;
A positive connection terminal and a negative connection terminal that are electrically connected to the winding group and penetrate the cover and project outside the cover;
Outside the lid, a positive external terminal and a negative external terminal connected to the positive connection terminal and the negative connection terminal, respectively,
An insulating member that electrically insulates the positive electrode external terminal and the negative electrode external terminal from the lid;
The positive electrode connecting terminal and the negative electrode connecting terminal, and a gasket that seals a gap between the lid,
The positive electrode connection terminal and the negative electrode connection terminal are formed with a caulked portion whose diameter is increased outside the lid,
Each of the positive external terminal and the negative external terminal is provided with a portion along which the caulking portion is connected and a bus bar connecting portion to which a bus bar is connected, along the lid.
A thin flat portion capable of laser spot welding is locally formed on the peripheral edge of the caulking portion,
The thin flat portion in the caulking portion of the positive electrode connection terminal is formed only on the opposite side of the bus bar connection portion of the positive electrode external terminal,
The thin flat portion in the caulking portion of the negative electrode connection terminal is formed only on the opposite side of the bus bar connection portion of the negative electrode external terminal,
A secondary battery, wherein the thin flat portion is laser spot welded. 請求項１に記載の二次電池において、
前記薄肉平坦部は、前記かしめ部の最外周よりも内側に形成されていることを特徴とする二次電池。 The secondary battery according to claim 1,
The secondary battery according to claim 1, wherein the thin flat portion is formed on an inner side of an outermost periphery of the caulking portion . 請求項１または２に記載の二次電池において、
前記正極接続端子のかしめ部には、少なくとも前記正極外部端子のバスバー接続部に最も近い位置に前記薄肉平坦部が配置され、
前記負極接続端子のかしめ部には、少なくとも前記負極外部端子のバスバー接続部に最も近い位置に前記薄肉平坦部が配置されていることを特徴とする二次電池。 The secondary battery according to claim 1 or 2,
In the caulking portion of the positive electrode connecting terminal, the thin flat portion is arranged at a position closest to the bus bar connecting portion of the positive electrode external terminal,
The secondary battery is characterized in that the thin flat portion is disposed at a position closest to the bus bar connecting portion of the negative external terminal at the caulking portion of the negative connecting terminal . 請求項１乃至３のいずれか１項に記載の二次電池において、
前記正極接続端子および前記負極接続端子のかしめ部のそれぞれには、前記薄肉平坦部が複数形成されていることを特徴とする二次電池。 The secondary battery according to any one of claims 1 to 3 ,
A secondary battery in which a plurality of the thin flat portions are formed in each of the caulking portions of the positive electrode connecting terminal and the negative electrode connecting terminal . 請求項１乃至４のいずれか１項に記載の二次電池において、
前記薄肉平坦部は円形または楕円形であることを特徴とする二次電池。 The secondary battery according to any one of claims 1 to 4 ,
The secondary battery according to claim 1, wherein the thin flat portion is circular or elliptical .
JP2010167995A 2010-07-27 2010-07-27 Secondary battery Expired - Fee Related JP5590391B2 (en)

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