JP2011216402A - Square secondary battery - Google Patents

Square secondary battery Download PDF

Info

Publication number
JP2011216402A
JP2011216402A JP2010085116A JP2010085116A JP2011216402A JP 2011216402 A JP2011216402 A JP 2011216402A JP 2010085116 A JP2010085116 A JP 2010085116A JP 2010085116 A JP2010085116 A JP 2010085116A JP 2011216402 A JP2011216402 A JP 2011216402A
Authority
JP
Japan
Prior art keywords
positive
negative electrode
secondary battery
power generation
battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2010085116A
Other languages
Japanese (ja)
Inventor
Koichi Kajiwara
浩一 梶原
Hideyuki Shibanuma
英幸 柴沼
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vehicle Energy Japan Inc
Original Assignee
Hitachi Vehicle Energy Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Vehicle Energy Ltd filed Critical Hitachi Vehicle Energy Ltd
Priority to JP2010085116A priority Critical patent/JP2011216402A/en
Publication of JP2011216402A publication Critical patent/JP2011216402A/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Landscapes

  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

PROBLEM TO BE SOLVED: To reduce electric resistance from a collector to an external output terminal.SOLUTION: Mounting parts 61, 51 extended up to the vicinity of a narrow-side surface 14N of a battery can 14 are provided along an inner surface of a battery lid 3 on cathode and anode collectors 6 and 5, respectively. Cathode and anode output parts 8 and 7 are fitted to the mounting parts 61, 51 respectively. Connection parts 62, 52 are fitted to the cathode and anode collectors 6 and 5, respectively, and are connected to non-coated parts 122A and 124A of cathode and anode terminals 122 and 124. Since the cathode and anode output parts 8 and 7 corresponding to conventional cathode and anode outer terminals are integrally formed with the cathode and anode electrode collectors 6 and 5, no such contact resistance exists as in a prior art, and so, electric resistance is low.

Description

本発明は、角形二次電池に関する。   The present invention relates to a prismatic secondary battery.

特許文献１には、深絞り法により開口部の短辺の寸法より深さ寸法を大きく形成した金属製の電池缶に、絶縁ケースを介して発電要素群を収容した角形二次電池が開示されている。電池缶の開口部は、電池蓋をレーザービーム溶接により固着して封止されている。電池缶内には注液口から電解液が注入されており、注液口はレーザービーム溶接により封止されている。電池缶内に注液口から電解液が注入された後に、注液口はレーザービーム溶接により気密封止されている。   Patent Document 1 discloses a prismatic secondary battery in which a power generation element group is accommodated in a metal battery can having a depth dimension larger than a dimension of a short side of an opening by a deep drawing method via an insulating case. ing. The opening of the battery can is sealed by fixing the battery lid by laser beam welding. An electrolytic solution is injected into the battery can from the injection port, and the injection port is sealed by laser beam welding. After the electrolytic solution is injected into the battery can from the injection port, the injection port is hermetically sealed by laser beam welding.

そして、発電要素群においては、正負極箔に正負極合剤をそれぞれ塗布した正負極板が、セパレータを介して捲回または積層されており、正負極板には、正負極合剤の未塗工部がそれぞれ形成されている。未塗工部には、正負極集電体が超音波溶接により接合されている。電池蓋には、正負極集電体に接続された正負極外部端子が設けられている。   In the power generation element group, positive and negative electrode plates each coated with a positive and negative electrode mixture on positive and negative electrode foils are wound or laminated via a separator, and the positive and negative electrode plates are not coated with a positive and negative electrode mixture. Each engineering part is formed. A positive and negative electrode current collector is joined to the uncoated portion by ultrasonic welding. The battery lid is provided with positive and negative external terminals connected to the positive and negative current collectors.

正負極外部端子は、シール部材を介して電池蓋に取り付けられ、電池蓋と正負極外部端子とは電気的に絶縁されるとともに、電池蓋と正負極外部端子との間の封水性が確保される。シール部材であるガスケットは圧縮して使用され、圧縮後の形状と位置はネジ締結もしくは、かしめによって保持されている。   The positive and negative external terminals are attached to the battery lid via a sealing member, and the battery lid and the positive and negative external terminals are electrically insulated, and a water seal between the battery lid and the positive and negative external terminals is ensured. The A gasket as a seal member is used after being compressed, and the shape and position after compression are held by screw fastening or caulking.

特許３６９１２６８Patent 3691268

特許文献１記載の角形二次電池は、正負極集電体と正負極外部端子とはレーザービーム溶接により接合されるが、正負極集電体と正負極外部端子との接合界面には接合抵抗（接触抵抗）が発生し、電気抵抗が大きくなる。   In the prismatic secondary battery described in Patent Document 1, the positive and negative electrode current collectors and the positive and negative electrode external terminals are joined by laser beam welding, but the junction resistance between the positive and negative electrode current collectors and the positive and negative electrode external terminals is a junction resistance. (Contact resistance) occurs, and the electrical resistance increases.

本発明による角形二次電池は、正極板、負極板、および前記正負極板を絶縁するセパレータを積層してなる発電要素群と、前記発電要素群が収納された容器外装と、前記発電要素群で発電した電力を正負極外部出力部を経由して外部に出力する正負極集電体とを備え、前記正負極集電体のそれぞれの一端には、前記発電要素群と接続される発電要素接続部が形成され、他端には、前記正負極出力部が形成されていることを特徴とする。   The prismatic secondary battery according to the present invention includes a power generation element group formed by laminating a positive electrode plate, a negative electrode plate, and a separator that insulates the positive and negative electrode plates, a container exterior housing the power generation element group, and the power generation element group. A positive and negative electrode current collector that outputs the electric power generated at the outside via a positive and negative electrode external output unit, and at one end of each of the positive and negative electrode current collectors, a power generation element connected to the power generation element group A connecting portion is formed, and the positive and negative output portions are formed at the other end.

本発明によれば、発電要素群と接続される接続部から外部出力部への電流経路の電気抵抗を低減することができる。   ADVANTAGE OF THE INVENTION According to this invention, the electrical resistance of the current path from the connection part connected with an electric power generation element group to an external output part can be reduced.

本発明による角形二次電池示す外観斜視図。1 is an external perspective view showing a prismatic secondary battery according to the present invention. 図１の角形二次電池の分解斜視図。The disassembled perspective view of the square secondary battery of FIG. 図１の角形二次電池の捲回型発電要素群を示す外観斜視図。The external appearance perspective view which shows the winding type electric power generation element group of the square secondary battery of FIG. 図１の角形二次電池の負極出力部の周辺部材を拡大して示す縦断面図。The longitudinal cross-sectional view which expands and shows the peripheral member of the negative electrode output part of the square secondary battery of FIG. 図１の正負極集電体の組み立て方法を示す分解断面図。FIG. 2 is an exploded cross-sectional view illustrating a method for assembling the positive and negative electrode current collectors of FIG. 1. 本発明による角形二次電池の第２実施形態を示す断面図。Sectional drawing which shows 2nd Embodiment of the square secondary battery by this invention. 本発明による角形二次電池の第３実施形態を示す断面図。Sectional drawing which shows 3rd Embodiment of the square secondary battery by this invention.

次に、本発明による角形二次電池をリチウムイオン電池に適用した実施形態を、図面を参照して説明する。   Next, an embodiment in which a rectangular secondary battery according to the present invention is applied to a lithium ion battery will be described with reference to the drawings.

−第１実施形態−
[角形電池の構成]
図１および図２に示すように、角形二次電池は、一面が開口した直方体状の電池缶１４内に絶縁ケース１３を介して捲回型発電要素群１２０を収納し、電池缶１４の開口部１４Ａを電池蓋３によって封止している。電池缶４と電池蓋３によって容器外装が構成される。電池蓋３には、内側から正極出力部８および負極出力部７が突設され、正極出力部８および負極出力部７は、容器外装の外側から抜け止めワッシャ１０により抜け止されている。正負極出力部８および７は、容器外装の表面に設けられた正負極外部端子である。正負極外部端子８および７は、捲回型発電要素群１２０で発電した電力を外部に出力し、外部で発電した電力を捲回型発電要素群１２０に充電するための端子であり、後述する正負極集電体６および５に一体的に形成されている。 -First embodiment-
[Configuration of square battery]
As shown in FIGS. 1 and 2, the rectangular secondary battery includes a wound type power generation element group 120 accommodated in a rectangular battery can 14 having an opening on one side via an insulating case 13. The part 14 </ b> A is sealed with the battery lid 3. The battery can 4 and the battery lid 3 constitute a container exterior. The battery lid 3 is provided with a positive electrode output portion 8 and a negative electrode output portion 7 projecting from the inside, and the positive electrode output portion 8 and the negative electrode output portion 7 are prevented from being detached from the outside of the container exterior by a retaining washer 10. The positive and negative output parts 8 and 7 are positive and negative external terminals provided on the surface of the container exterior. The positive and negative external terminals 8 and 7 are terminals for outputting the power generated by the wound power generation element group 120 to the outside and charging the wound power generation element group 120 with the power generated outside. The positive and negative electrode current collectors 6 and 5 are integrally formed.

電池缶１４は金属製であり、深絞り法により開口部の短辺の寸法より深さ寸法が大きく形成されている。電池缶１４は、有底直方体容器の面積の大きな幅広側面１４Ｗと、面積の小さい幅狭側面１４Ｎと、容器底面である底面１４Ｂとで形成された扁平容器であり、上面に開口部１４Ａを有する。電池蓋３は、レーザービーム溶接法により電池缶１４の開口部１４Ａに固着されている。電池蓋３には注液口（図示省略）が設けられ、注液口から電池缶１４内に電解液が注入された後に、注液口はレーザービーム溶接により封止される。   The battery can 14 is made of metal and has a depth dimension larger than the dimension of the short side of the opening by a deep drawing method. The battery can 14 is a flat container formed by a wide side surface 14W having a large area of a bottomed rectangular parallelepiped container, a narrow side surface 14N having a small area, and a bottom surface 14B which is a bottom surface of the container, and has an opening 14A on the upper surface. . The battery lid 3 is fixed to the opening 14A of the battery can 14 by a laser beam welding method. The battery lid 3 is provided with a liquid injection port (not shown). After the electrolyte is injected into the battery can 14 from the liquid injection port, the liquid injection port is sealed by laser beam welding.

[発電要素電極群]
図３に示すように、捲回型発電要素群１２０は、正負極箔ＡＦおよびＣＦに正負極活物質合剤１２３および１２５をそれぞれ塗布した正負極板１２２および１２４をセパレータ１２１を介して捲回して断面長円状に形成したものである。正負極板１２２および１２４には、正負極活物質合剤１２３および１２５が塗布されずに正負極箔ＡＦ,ＣＦが露出した未塗工部１２２Ａおよび１２４Ａがそれぞれ正負極接続部として形成されている。未塗工部１２２Ａおよび１２４Ａは、捲回型発電要素群１２０の幅方向の両端部に配置され、それぞれ、電池缶１４の両狭側面１４Ｎに沿って延在している。 [Power generation element electrode group]
As shown in FIG. 3, the wound-type power generation element group 120 winds positive and negative electrode plates 122 and 124 each having positive and negative electrode active materials 123 and 125 applied to positive and negative electrode foils AF and CF through a separator 121. The cross section is formed in an oval shape. On the positive and negative electrode plates 122 and 124, uncoated portions 122A and 124A in which the positive and negative electrode foils AF and CF are exposed without the application of the positive and negative electrode active material mixtures 123 and 125 are formed as positive and negative electrode connecting portions, respectively. . The uncoated portions 122A and 124A are disposed at both ends in the width direction of the wound power generation element group 120 and extend along both narrow side surfaces 14N of the battery can 14 respectively.

正負極箔ＡＦおよびＣＦとしては、それぞれアルミニウム、銅が用いられ、活物質合剤としては、例えば、正極としてコバルト酸リチウム、負極としてグラファイトが用いられる。そして、正負極集電体６および５は、正負極箔ＡＦおよびＣＦと同一材料によって形成される。   As the positive and negative electrode foils AF and CF, aluminum and copper are used, respectively. As the active material mixture, for example, lithium cobaltate as a positive electrode and graphite as a negative electrode are used. The positive and negative electrode current collectors 6 and 5 are formed of the same material as the positive and negative electrode foils AF and CF.

正負極板１２２および１２４の未塗工部１２２Ａおよび１２４Ａには、正極集電体６および負極集電体５がそれぞれ接続されている。正負極出力部８および７は正負極集電体６および５にそれぞれ一体的に設けられている。   The positive electrode current collector 6 and the negative electrode current collector 5 are connected to uncoated portions 122A and 124A of the positive and negative electrode plates 122 and 124, respectively. The positive and negative electrode output portions 8 and 7 are provided integrally with the positive and negative electrode current collectors 6 and 5, respectively.

[集電体]
図２および図４に示すように、正負極集電体６および５は略Ｌ字形状に形成され、電池蓋３に固定されている。 [Current collector]
As shown in FIGS. 2 and 4, the positive and negative electrode current collectors 6 and 5 are formed in an approximately L shape and are fixed to the battery lid 3.

正負極集電体６および５は、それぞれアルミニウム板および銅板のプレス加工によって一体的に形成されている。正負極集電体６および５は、電池蓋３の内面に沿って、電池缶１４の幅狭側面１４Ｎ内面近傍にまで延びる装着部６１および５１を備えている。正負極出力部８および７は、それぞれ装着部６１および５１に突設されている。平板である装着部６１および５１からプレス加工により形成された円筒の頂面が正負極出力部８および７であり、円筒頂面にバスバーなどの外部接続板が溶接される。   The positive and negative electrode current collectors 6 and 5 are integrally formed by pressing an aluminum plate and a copper plate, respectively. The positive and negative electrode current collectors 6 and 5 include mounting portions 61 and 51 that extend along the inner surface of the battery lid 3 to the vicinity of the inner surface of the narrow side surface 14N of the battery can 14. The positive and negative electrode output parts 8 and 7 are projected from the mounting parts 61 and 51, respectively. The top surfaces of the cylinder formed by pressing from the mounting portions 61 and 51 which are flat plates are the positive and negative electrode output portions 8 and 7, and an external connection plate such as a bus bar is welded to the top surface of the cylinder.

正負極集電体６および５は、装着部６１および５１の端部から略直角方向に電池缶１４の幅狭側面１４Ｎに沿って底面に延びる接続部６２および５２を備えている。接続部６２および５２は、負極板１２４の未塗工部１２２Ａおよび１２４Ａにそれぞれ沿って延設されている。接続部６２および５２には、正負極板１２２および１２４の未塗工部１２２Ａおよび１２４Ａと対向配置される正負極発電要素接続部６３および５３が設けられている。正負極発電要素接続部６３および５３は、幅狭側面１４Ｎに並行に延設されている接続部６２および５２から、幅広側面１４Ｗに沿って容器中央部に直角に折り曲げられて形成されている。正負極発電要素接続部６３および５３は未塗工部１２２Ａおよび１２４Ａに超音波溶接にて接合されている。   The positive and negative electrode current collectors 6 and 5 include connection portions 62 and 52 that extend from the end portions of the mounting portions 61 and 51 to the bottom surface along the narrow side surface 14N of the battery can 14 in a substantially right-angle direction. Connection portions 62 and 52 extend along uncoated portions 122A and 124A of negative electrode plate 124, respectively. The connecting parts 62 and 52 are provided with positive and negative power generating element connecting parts 63 and 53 arranged to face the uncoated parts 122A and 124A of the positive and negative plates 122 and 124, respectively. The positive and negative power generating element connecting portions 63 and 53 are formed by being bent at right angles to the center of the container along the wide side surface 14W from the connecting portions 62 and 52 extending in parallel with the narrow side surface 14N. The positive and negative power generating element connecting portions 63 and 53 are joined to the uncoated portions 122A and 124A by ultrasonic welding.

[負極出力部]
正負極集電体６および５は左右対称の勝手違い形状であるが、その構成要素は同一であり、図４を参照して負極集電板５、とくに負極出力部７について説明する。 [Negative electrode output section]
Although the positive and negative electrode current collectors 6 and 5 are symmetrical and different in shape, the components are the same, and the negative electrode current collector plate 5, particularly the negative electrode output unit 7, will be described with reference to FIG. 4.

負極出力部７は、装着部５１の表面から突出する大径円筒部５４と、大径円筒部５４の先端部から電池缶１４の外方向に突出する小径円筒部５５とを備えている。小径円筒部５５の先端部には、後述するかしめ加工によって抜け止めフランジ５６が形成され、抜け止めフランジ５６は、抜け止めワッシャ１０の外側端面に当接している。これによって、抜け止めワッシャ１０は、負極出力部７が電池缶１４内側方向へ抜けることを阻止している。   The negative electrode output unit 7 includes a large-diameter cylindrical portion 54 that protrudes from the surface of the mounting portion 51, and a small-diameter cylindrical portion 55 that protrudes outward from the tip of the large-diameter cylindrical portion 54. A retaining flange 56 is formed at the tip of the small diameter cylindrical portion 55 by caulking, which will be described later. The retaining flange 56 is in contact with the outer end surface of the retaining washer 10. As a result, the retaining washer 10 prevents the negative electrode output portion 7 from coming out inward of the battery can 14.

段付円筒形状の負極出力部７は、電池蓋３の開口部４を貫通して電池容器の外へ突出してる。周縁に抜け止めフランジ５６が形成された円筒頂面５７は負極出力部７、すなわち外部接続端子として機能し、図示しないバスバーが溶接される。   The stepped cylindrical negative electrode output section 7 penetrates the opening 4 of the battery lid 3 and protrudes out of the battery container. A cylindrical top surface 57 with a retaining flange 56 formed on the periphery functions as the negative electrode output portion 7, that is, an external connection terminal, and a bus bar (not shown) is welded.

電池蓋３の開口部４には、略円板状のガスケット９が嵌装されている。ガスケット９は、電池蓋３と装着部５１との間に介在する環状部９１と、環状部９１の内周に連続して、負極出力部７の外周と貫通孔４の内周との間に介在する円筒部９２と、円筒部９２の外側端部で外周方向に拡がるフランジ部９３とを備えている。負極出力部７の大径円筒部５４は、ガスケット９の円筒部９２の内周に挿入され、小径円筒部５５には抜け止めワッシャ１０が嵌装されている。   A substantially disc-shaped gasket 9 is fitted into the opening 4 of the battery lid 3. The gasket 9 is formed between the annular portion 91 interposed between the battery lid 3 and the mounting portion 51, and the inner periphery of the annular portion 91 between the outer periphery of the negative electrode output portion 7 and the inner periphery of the through hole 4. An intervening cylindrical portion 92 and a flange portion 93 extending in the outer peripheral direction at the outer end portion of the cylindrical portion 92 are provided. The large diameter cylindrical portion 54 of the negative electrode output portion 7 is inserted into the inner periphery of the cylindrical portion 92 of the gasket 9, and the retaining washer 10 is fitted to the small diameter cylindrical portion 55.

ガスケット９は、負極集電体５と電池蓋３との間の封水性能を確保するが、さらに、負極集電体５と電池蓋３とを電気的に絶縁する。   The gasket 9 ensures sealing performance between the negative electrode current collector 5 and the battery cover 3, but further electrically insulates the negative electrode current collector 5 and the battery cover 3.

第1実施形態の角形電池の製造方法を説明する。
組立に先だって、電池容器１４，電池蓋３，集電体５，６、発電要素群１２０などの部品を製作しておく。したがって、本発明による角形二次電池の製造方法は、少なくとも電池容器製造工程と、電池蓋製造工程と、集電体製造工程と、発電要素群製造工程とを含む。 A method for manufacturing the prismatic battery according to the first embodiment will be described.
Prior to assembly, parts such as the battery container 14, the battery lid 3, the current collectors 5 and 6, and the power generation element group 120 are manufactured. Therefore, the method for manufacturing a rectangular secondary battery according to the present invention includes at least a battery container manufacturing process, a battery lid manufacturing process, a current collector manufacturing process, and a power generation element group manufacturing process.

[集電体固着工程]
電池蓋３に正負極集電体6および５を固着する。図５を参照して、負極集電体５を電池蓋３に固着する工程を説明する。 [Current collector fixing process]
Positive and negative electrode current collectors 6 and 5 are fixed to the battery lid 3. With reference to FIG. 5, the process of adhering the negative electrode current collector 5 to the battery lid 3 will be described.

（ａ）電池蓋３の開口部４にガスケット９を嵌装する。
（ｂ）電池蓋３の内面側から、負極集電体５の円筒部５４，５５を、貫通孔４に装着したガスケット９から電池蓋３の外面側に貫通させる。
（ｃ）抜け止めワッシャ１０を小径円筒部５５に嵌装し、円筒部５５を上下から挟み込んでかしめ加工を行い、抜け止めフランジ部５６を抜け止めワッシャ１０にかしめる。 (A) A gasket 9 is fitted into the opening 4 of the battery lid 3.
(B) From the inner surface side of the battery lid 3, the cylindrical portions 54 and 55 of the negative electrode current collector 5 are penetrated from the gasket 9 attached to the through hole 4 to the outer surface side of the battery lid 3.
(C) The retaining washer 10 is fitted into the small-diameter cylindrical portion 55, and the cylindrical portion 55 is sandwiched from above and below to perform caulking, and the retaining flange portion 56 is caulked to the retaining washer 10.

以上の（ａ）〜（ｃ）の３工程により、負極集電体５が電池蓋３に固着される。
なお、正極集電体６も負極集電体５と同様にして電池蓋３に固着される。 The negative electrode current collector 5 is fixed to the battery lid 3 through the above three steps (a) to (c).
The positive electrode current collector 6 is also fixed to the battery lid 3 in the same manner as the negative electrode current collector 5.

[蓋組立体製造工程]
正負極集電体６および５の接続部６３および５３に発電要素群１２０の正極未塗工部１２２Ａと負極未塗工部１２４Ａを超音波溶接する。これにより、電池蓋３，正負極集電体６および５，発電要素群１２０を一体化した蓋組立体が製造される。 [Lid assembly manufacturing process]
The positive electrode uncoated portion 122A and the negative electrode uncoated portion 124A of the power generation element group 120 are ultrasonically welded to the connection portions 63 and 53 of the positive and negative electrode current collectors 6 and 5. Thus, a lid assembly in which the battery lid 3, the positive and negative electrode current collectors 6 and 5, and the power generation element group 120 are integrated is manufactured.

[蓋組立体収容工程]
絶縁ケース１３に入れた蓋組立体を電池容器１４に収納する。
[容器封止工程]
電池容器１４の開口部１４Ａを電池蓋３で塞ぎ、外周部をレーザ溶接することにより、電池容器１４を封止する。
[電解液注液工程]
電池蓋３の図示しない注液口から電解液を注液し、注液口に封止栓をレーザ溶接して注液口を封止する。
以上の各工程を経て図1に示す角形二次電池が製造される。 [Lid assembly housing process]
The lid assembly placed in the insulating case 13 is stored in the battery container 14.
[Container sealing process]
The battery container 14 is sealed by closing the opening 14 </ b> A of the battery container 14 with the battery lid 3 and laser welding the outer periphery.
[Electrolyte injection process]
An electrolyte solution is injected from an injection port (not shown) of the battery lid 3, and a sealing plug is laser welded to the injection port to seal the injection port.
The rectangular secondary battery shown in FIG. 1 is manufactured through the above steps.

以上説明した角形二次電池によれば、次のような作用効果を奏することができる。
（１）正極出力部8と負極出力部７はそれぞれ、正負極集電体６および５に一体形成されている。すなわち、発電要素群１２０と接続される正極接続部６３から正極外部出力部８への電流経路、および発電要素群１２０と接続される負極接続部５３から負極外部出力部７への電流経路のそれぞれを、一つの導電部材８および７で構成した。その結果、上記電流経路の電気抵抗を低減することができる。換言すると、従来のように、互いに溶接されている二つの導電部材を上記電流経路に設けた場合には、２部材間の接触抵抗が発生するが、本発明では一部材としたので、上記電流経路の電気抵抗を低減することができる。 According to the rectangular secondary battery described above, the following operational effects can be achieved.
(1) The positive electrode output portion 8 and the negative electrode output portion 7 are integrally formed with the positive and negative electrode current collectors 6 and 5, respectively. That is, each of the current path from the positive electrode connection part 63 connected to the power generation element group 120 to the positive electrode external output part 8 and the current path from the negative electrode connection part 53 connected to the power generation element group 120 to the negative electrode external output part 7 Was composed of one conductive member 8 and 7. As a result, the electric resistance of the current path can be reduced. In other words, when two conductive members welded to each other are provided in the current path as in the prior art, a contact resistance between the two members is generated. The electrical resistance of the path can be reduced.

（２）正負極出力部８および７を正負極集電体６および５に一体形成したので、部品点数が減少し、製造コストを低減することができる。 (2) Since the positive and negative electrode output portions 8 and 7 are integrally formed with the positive and negative electrode current collectors 6 and 5, the number of parts can be reduced and the manufacturing cost can be reduced.

［第２実施形態］
次に、本発明による角形二次電池の第２実施形態を図６を参照して説明する。なお、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、説明を省略する。第２実施形態は、第１実施形態の構成に加え、電池蓋３の内面にシール用突起３Ｐを形成したものである。 [Second Embodiment]
Next, a second embodiment of the prismatic secondary battery according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same part as 1st Embodiment, or an equivalent part, and description is abbreviate | omitted. In the second embodiment, a sealing projection 3P is formed on the inner surface of the battery lid 3 in addition to the configuration of the first embodiment.

図６に示すように、電池蓋３の内面には、負極集電体５の大径円筒部５４と同心の円環状で、ガスケット９に向かって突出するシール用突起３Ｐが形成されている。シール用突起３Ｐは、ガスケット９に食い込んでおり、電池蓋３とガスケット９との間を緊密にシールしている。   As shown in FIG. 6, a sealing protrusion 3 </ b> P is formed on the inner surface of the battery lid 3, which is concentric with the large-diameter cylindrical portion 54 of the negative electrode current collector 5 and protrudes toward the gasket 9. The sealing projection 3P bites into the gasket 9 and tightly seals between the battery lid 3 and the gasket 9.

正極集電体６も負極集電体５と同様な構成である。   The positive electrode current collector 6 has the same configuration as the negative electrode current collector 5.

第２の実施形態の角形二次電池は、ガスケット９の円筒部９２で容器内部をシールするとともに、環状部９１でもシールしている。したがって、第２実施形態は第１実施形態の効果に加え、正負極出力部８および７と電池蓋３とのシール性能が高いという効果を奏する。   In the prismatic secondary battery of the second embodiment, the inside of the container is sealed by the cylindrical portion 92 of the gasket 9, and the annular portion 91 is also sealed. Therefore, in addition to the effect of the first embodiment, the second embodiment has an effect that the sealing performance between the positive and negative electrode output portions 8 and 7 and the battery lid 3 is high.

［第３実施形態］
次に、本発明による角形二次電池の第３実施形態を図７を参照して説明する。なお、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、説明を省略する。第３実施形態は、第２実施形態で電池蓋３に形成されていたシール用突起３Ｐに代えて、装着部５１にシール用突起５１Ｐを形成したものである。 [Third Embodiment]
Next, a third embodiment of the prismatic secondary battery according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same part as 1st Embodiment, or an equivalent part, and description is abbreviate | omitted. In the third embodiment, instead of the sealing projection 3P formed on the battery lid 3 in the second embodiment, a sealing projection 51P is formed on the mounting portion 51.

図７に示すように、負極集電体５の装着部５１には、大径円筒部５４と同心の円環状で、ガスケット９に向かって突出するシール用突起５１Ｐが形成されている。シール用突起５１Ｐは、ガスケット９に食い込んでおり、装着部５１とガスケット９との間を緊密にシールしている。   As shown in FIG. 7, the mounting portion 51 of the negative electrode current collector 5 is formed with a sealing protrusion 51 </ b> P that is concentric with the large-diameter cylindrical portion 54 and protrudes toward the gasket 9. The sealing projection 51P bites into the gasket 9, and tightly seals between the mounting portion 51 and the gasket 9.

正極集電体６も負極集電体５と同様な構成である。   The positive electrode current collector 6 has the same configuration as the negative electrode current collector 5.

第３の実施形態の角形二次電池は、ガスケット９の円筒部９２で容器内部をシールするとともに、環状部９１でもシールしている。したがって、第２実施形態は第１実施形態の効果に加え、正負極出力部８および７と電池蓋３とのシール性能が高いという効果を奏する。   In the prismatic secondary battery according to the third embodiment, the inside of the container is sealed by the cylindrical portion 92 of the gasket 9 and the annular portion 91 is also sealed. Therefore, in addition to the effect of the first embodiment, the second embodiment has an effect that the sealing performance between the positive and negative electrode output portions 8 and 7 and the battery lid 3 is high.

第３実施形態は第２実施形態と同様の作用効果を奏する。   The third embodiment has the same effects as the second embodiment.

［変形例］
（１）第１実施形態では、発電要素群１２０は捲回型であったが、矩形正負極板と矩形セパレータとを積層してなる発電要素群を用いた角形二次電池にも本発明を適用することができる。 [Modification]
(1) In the first embodiment, the power generation element group 120 is a wound type, but the present invention is also applied to a prismatic secondary battery using a power generation element group in which rectangular positive and negative electrode plates and a rectangular separator are stacked. Can be applied.

（２）第１実施形態では、電池缶１４の幅狭開口部１４Ａを電池蓋３で封止するものであったが、幅広側面１４Ｗに開口部を有し、この開口部を電池蓋で封止し、この電池蓋から正負極外部出力部を突設するようにした電池缶にも本発明を適用できる。この場合、発電要素群は幅広の開口部と対向して配置される。 (2) In the first embodiment, the narrow opening 14A of the battery can 14 is sealed with the battery lid 3, but the wide side surface 14W has an opening, and the opening is sealed with the battery lid. The present invention can also be applied to a battery can that has a positive and negative external output projecting from the battery lid. In this case, the power generation element group is arranged to face the wide opening.

なお、この形式の電池は、幅狭開口部１４Ａを電池蓋３で封止した実施形態の電池に比べると、発電要素群から外部出力端子までの電流経路の長さは短く電気抵抗も小さいが、本発明を適用すれば、さらに電気抵抗を小さくすることができる。   In this type of battery, the length of the current path from the power generation element group to the external output terminal is short and the electrical resistance is small compared to the battery of the embodiment in which the narrow opening 14A is sealed with the battery lid 3. If the present invention is applied, the electrical resistance can be further reduced.

（３）第１実施形態では、正負極出力部８および７に対応して貫通孔４を２個設けているが、より多くの正負極出力部８および７を設けるとともに、これに対応したより多くの貫通孔４を設けることも可能である。 (3) In the first embodiment, two through holes 4 are provided corresponding to the positive and negative output parts 8 and 7, but more positive and negative output parts 8 and 7 are provided, and more Many through holes 4 can be provided.

（４）第１実施形態では、正負極集電体６および５は金属板をプレス加工したものであったが、正負極出力部８および７と一体形成され、かつ発電要素群１２０の正負極板１２２および１２４に電気的に接続されるものであれば、他の任意の形状を採用することができる。 (4) In the first embodiment, the positive and negative electrode current collectors 6 and 5 are formed by pressing a metal plate. However, the positive and negative electrode current collectors 6 and 5 are integrally formed with the positive and negative electrode output portions 8 and 7 and Any other shape can be adopted as long as it is electrically connected to the plates 122 and 124.

（５）第２および第３実施形態では、ガスケット９は、大径円筒部５４の周囲のシールと、電池蓋３と負極集電体５とのシールを兼用することとしたが、各部のシールに別個のシール部材を用いてもよい。 (5) In the second and third embodiments, the gasket 9 is used as a seal around the large-diameter cylindrical portion 54 and a seal between the battery lid 3 and the negative electrode current collector 5. A separate seal member may be used.

以上説明した角形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。したがって、   The prismatic secondary battery described above is an example, and the present invention is not limited to the above-described embodiments and modifications. Therefore,

３：電池蓋
４：貫通穴
５：負極集電体
６：正極集電体
７：負極出力部
８：正極出力部
９：ガスケット
１０：抜け止めワッシャ
１１：電池蓋のシール用突起
１２：極板のシール用突起
１３：絶縁ケース
１４：電池缶
１５：抜け止めフランジ部
２０Ａ：正極板
２０Ｂ：負極板
５１：負極集電体
５３：負極発電要素接続部
６１：正極集電体
６３：正極発電要素接続部
９３ フランジ部
９３ 環状部
９１ 円筒部
１２０：捲回型発電要素群
１２１：セパレータ
１２２：正極板
１２２Ａ、１２４Ａ：未塗工部
１２３：正極側活物質合剤
１２４：負極板
１２５：負極側活物質合剤
3: Battery cover 4: Through hole 5: Negative electrode current collector 6: Positive electrode current collector 7: Negative electrode output unit 8: Positive electrode output unit 9: Gasket 10: Retaining washer 11: Battery cover sealing protrusion 12: Electrode plate Protrusion 13 for sealing: insulating case 14: battery can 15: retaining flange
20A: Positive electrode plate 20B: Negative electrode plate 51: Negative electrode current collector 53: Negative electrode power generation element connection portion 61: Positive electrode current collector 63: Positive electrode power generation element connection portion 93 Flange portion 93 Annular portion 91 Cylindrical portion 120: Winding type power generation element Group 121: Separator 122: Positive electrode plate 122A, 124A: Uncoated portion 123: Positive electrode side active material mixture 124: Negative electrode plate 125: Negative electrode side active material mixture

Claims (6)

正極板、負極板、および前記正負極板を絶縁するセパレータを積層してなる発電要素群と、
前記発電要素群が収納された容器外装と、
前記発電要素群で発電した電力を正負極外部出力部を経由して外部に出力する正負極集電体とを備え、
前記正負極集電体のそれぞれの一端には、前記発電要素群と接続される発電要素接続部が形成され、他端には、前記正負極出力部が形成されていることを特徴とする角形二次電池。 A power generation element group formed by laminating a positive electrode plate, a negative electrode plate, and a separator for insulating the positive and negative electrode plates;
A container exterior housing the power generation element group;
A positive and negative electrode current collector that outputs electric power generated by the power generation element group to the outside via a positive and negative electrode external output unit;
Each of the positive and negative electrode current collectors has a square shape in which a power generation element connection portion connected to the power generation element group is formed at one end and the positive and negative electrode output portion is formed at the other end. Secondary battery. 請求項１記載の角形二次電池において、
前記正負極集電体はそれぞれ、前記正負極出力部が前記容器外装の表面に設けられるように、前記他端に形成した外部出力部が前記容器外装を貫通して配置されていることを特徴とする角形二次電池。 The prismatic secondary battery according to claim 1,
The positive and negative electrode current collectors are characterized in that an external output part formed at the other end is disposed through the container exterior so that the positive and negative output parts are provided on the surface of the container exterior. A square secondary battery. 請求項２記載の角形二次電池において、
前記容器外装は、開口部を有する扁平容器と、前記開口部を封止する電池蓋とを備え、
前記正負極集電体は前記電池蓋を貫通し、他端に形成された前記正負極出力部が前記電池蓋の表面に突設されていることを特徴とする角形二次電池。 The prismatic secondary battery according to claim 2,
The container exterior includes a flat container having an opening, and a battery lid that seals the opening.
The prismatic secondary battery, wherein the positive and negative electrode current collectors penetrate the battery lid, and the positive and negative electrode output portions formed at the other end protrude from the surface of the battery lid. 請求項１乃至３のいずれか１項に記載の角形二次電池において、
前記発電要素群は、正極活物質が塗布された前記正極板と、負極活物質が塗布された前記負極板とがセパレータを介して扁平形状に捲回され、両端部に前記正負極活物質が塗布されていない正負極未塗工部が正負極接続部として設けられており、
前記正負極集電体の前記発電要素接続部が前記正負極未塗工部に溶接されていることを特徴とする角形二次電池。 The prismatic secondary battery according to any one of claims 1 to 3,
In the power generation element group, the positive electrode plate coated with a positive electrode active material and the negative electrode plate coated with a negative electrode active material are wound in a flat shape via a separator, and the positive and negative electrode active materials are formed at both ends. An uncoated positive / negative electrode uncoated part is provided as a positive / negative electrode connection part,
The prismatic secondary battery, wherein the power generating element connecting portion of the positive and negative electrode current collector is welded to the positive and negative electrode uncoated portion. 請求項３に記載の角形二次電池において、
前記電池蓋には貫通孔が穿設され、前記正負極出力部は前記貫通孔を貫通し、前記正負極出力部と前記貫通孔との間をシールするシール部材を設けたことを特徴とする角形二次電池。 The prismatic secondary battery according to claim 3,
The battery cover is provided with a through hole, the positive / negative electrode output portion passes through the through hole, and a sealing member is provided for sealing between the positive / negative electrode output portion and the through hole. Square secondary battery. 請求項５記載の角形二次電池において、
前記シール部材は、前記電池蓋の内面と前記正負極集電体との間にも設けられて容器内部をシールすることを特徴とする角形二次電池。 The prismatic secondary battery according to claim 5,
The prismatic secondary battery, wherein the sealing member is provided between an inner surface of the battery lid and the positive and negative electrode current collectors to seal the inside of the container.
JP2010085116A 2010-04-01 2010-04-01 Square secondary battery Withdrawn JP2011216402A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2010085116A JP2011216402A (en) 2010-04-01 2010-04-01 Square secondary battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2010085116A JP2011216402A (en) 2010-04-01 2010-04-01 Square secondary battery

Publications (1)

Publication Number Publication Date
JP2011216402A true JP2011216402A (en) 2011-10-27

Family

ID=44945921

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2010085116A Withdrawn JP2011216402A (en) 2010-04-01 2010-04-01 Square secondary battery

Country Status (1)

Country Link
JP (1) JP2011216402A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012109241A (en) * 2010-11-15 2012-06-07 Sb Limotive Co Ltd Secondary battery
WO2013031668A1 (en) * 2011-08-31 2013-03-07 三洋電機株式会社 Rectangular battery
JP2014116317A (en) * 2012-08-29 2014-06-26 Showa Denko Kk Electricity storage device and method for manufacturing the same
US20150214535A1 (en) * 2014-01-28 2015-07-30 Samsung Sdi Co., Ltd. Secondary battery and secondary battery module
JP2015156345A (en) * 2014-02-21 2015-08-27 株式会社豊田自動織機 power storage device
US10818886B1 (en) 2019-05-13 2020-10-27 Contemporary Amperex Technology Co., Limited Secondary battery
WO2021082758A1 (en) * 2019-10-30 2021-05-06 宁德时代新能源科技股份有限公司 Top cover assembly, secondary battery, battery module and device
WO2023193206A1 (en) * 2022-04-07 2023-10-12 宁德时代新能源科技股份有限公司 End cover assembly, battery cell, battery and electric device

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8951663B2 (en) 2010-11-15 2015-02-10 Samsung Sdi Co., Ltd. Secondary battery
JP2012109241A (en) * 2010-11-15 2012-06-07 Sb Limotive Co Ltd Secondary battery
WO2013031668A1 (en) * 2011-08-31 2013-03-07 三洋電機株式会社 Rectangular battery
JPWO2013031668A1 (en) * 2011-08-31 2015-03-23 三洋電機株式会社 Square battery
US9356309B2 (en) 2011-08-31 2016-05-31 Sanyo Electric Co., Ltd. Prismatic battery
JP2014116317A (en) * 2012-08-29 2014-06-26 Showa Denko Kk Electricity storage device and method for manufacturing the same
US9525163B2 (en) * 2014-01-28 2016-12-20 Samsung Sdi Co., Ltd. Secondary battery and secondary battery module
US20150214535A1 (en) * 2014-01-28 2015-07-30 Samsung Sdi Co., Ltd. Secondary battery and secondary battery module
JP2015156345A (en) * 2014-02-21 2015-08-27 株式会社豊田自動織機 power storage device
US10818886B1 (en) 2019-05-13 2020-10-27 Contemporary Amperex Technology Co., Limited Secondary battery
EP3739652A1 (en) * 2019-05-13 2020-11-18 Contemporary Amperex Technology Co., Limited Secondary battery
WO2021082758A1 (en) * 2019-10-30 2021-05-06 宁德时代新能源科技股份有限公司 Top cover assembly, secondary battery, battery module and device
WO2023193206A1 (en) * 2022-04-07 2023-10-12 宁德时代新能源科技股份有限公司 End cover assembly, battery cell, battery and electric device

Similar Documents

Publication Publication Date Title
JP5525904B2 (en) Secondary battery
JP5509111B2 (en) Secondary battery
JP2011216402A (en) Square secondary battery
KR102091880B1 (en) Electric storage device, metal parts and manufacturing of electric storage device
KR101964760B1 (en) Energy storage device and method of producing the same
JP2013020944A (en) Storage element and manufacturing method of the same
KR101683213B1 (en) Rechargeable battery
JP6529806B2 (en) Secondary battery and assembled battery
JP2011527488A (en) Connection structure between electrode tab and cover plate
JP2012009319A (en) Secondary battery and battery pack
KR20160042243A (en) Rechargeable battery and method of manufacturing the same
WO2021153439A1 (en) Power storage device
KR20170098225A (en) Power storage element
KR101072954B1 (en) Rechargeable battery module
JP2011238412A (en) Secondary battery
JP2019053863A (en) Power storage element
JP2015197974A (en) Power storage element and power storage device
KR101658973B1 (en) Pouch type secondary battery and secondary battery module comprising the same
JP6015582B2 (en) Electricity storage element
JP6123544B2 (en) Power storage device and method for manufacturing power storage device
JP4168592B2 (en) Secondary battery and method for manufacturing secondary battery
JP2014167862A (en) Power storage element
JP5452324B2 (en) Prismatic secondary battery
JP6578974B2 (en) Electricity storage element
US9190637B2 (en) Rechargeable battery

Legal Events

Date Code Title Description
A300 Application deemed to be withdrawn because no request for examination was validly filed

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20130604