JP5006603B2 - Nonaqueous electrolyte secondary battery - Google Patents

Nonaqueous electrolyte secondary battery Download PDF

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JP5006603B2
JP5006603B2 JP2006241624A JP2006241624A JP5006603B2 JP 5006603 B2 JP5006603 B2 JP 5006603B2 JP 2006241624 A JP2006241624 A JP 2006241624A JP 2006241624 A JP2006241624 A JP 2006241624A JP 5006603 B2 JP5006603 B2 JP 5006603B2
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electrode group
conductive member
electrode
secondary battery
electrolyte secondary
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JP2008066075A (en
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雅嗣 荒井
欣也 青田
康介 井上
賢治 中井
英行 長谷川
雄一 北原
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Hitachi Ltd
Vehicle Energy Japan Inc
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    • 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
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    • 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
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    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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Description

本発明は、非水電解質二次電池の電極群と導電部材の接続構造に係わり、特に、電気自動車等に用いられる高出力、高密度の非水電解質二次電池の電極群と前記電極群との電気的な導通を図る導電部材の形状及び溶着構造に関する。   The present invention relates to a connection structure between an electrode group of a non-aqueous electrolyte secondary battery and a conductive member, and in particular, an electrode group of a high-power, high-density non-aqueous electrolyte secondary battery used in an electric vehicle or the like, and the electrode group. The present invention relates to a shape and a welding structure of a conductive member that achieves electrical conduction.

現在のハイブリッド自動車等に搭載されている二次電池は、ニッケル水素電池が主流であるが、今後は高出力で高密度のリチウムイオン電池（非水電解質二次電池）が普及すると予測されている。そのため、非水電解質二次電池には、高密度化及びハイブリッド自動車等の普及に伴い電気抵抗の低減、小型・軽量化のみならず、量産性向上も重要な課題となっている。   Nickel metal hydride batteries are the mainstream of secondary batteries installed in current hybrid vehicles, but it is predicted that high-power, high-density lithium-ion batteries (non-aqueous electrolyte secondary batteries) will become popular in the future. . Therefore, non-aqueous electrolyte secondary batteries are not only reduced in electrical resistance, reduced in size and weight, but also improved in mass productivity as density increases and the spread of hybrid vehicles become important issues.

リチウムイオン電池は、活性物質が塗布された帯状の正極（数〜数十ミクロンの厚さ）と負極間に樹脂製のセパレータを挟んで渦巻き状に巻かれた電極群とこれらが浸される電解液、前記電極群と電気的に導通した導電部材、さらに外部への導通を図る部材、収納用の電池ケースから構成される。電極群と導電部材との電気的な接続構造は、負極及び正極の端部に設けられたタブと呼ばれる耳状の部材を収束して、その収束部と導電部材とを溶接（溶着）する構造が一般的である。なお、電極群と導電部材とは、電池内の電気抵抗を低減するために、渦巻き状に巻かれた電極群の中心部から外周部の全ての箇所で電気的に接続する必要がある。   Lithium-ion batteries have a strip-shaped positive electrode (thickness of several to several tens of microns) coated with an active substance and an electrode group wound in a spiral shape with a resin separator between the negative electrode and an electrolysis in which these are immersed. It is composed of a liquid, a conductive member that is electrically connected to the electrode group, a member that is electrically connected to the outside, and a battery case for storage. The electrical connection structure between the electrode group and the conductive member is a structure in which an ear-shaped member called a tab provided at the ends of the negative electrode and the positive electrode is converged and the converging portion and the conductive member are welded (welded). Is common. In addition, in order to reduce the electrical resistance in a battery, it is necessary to electrically connect an electrode group and an electrically-conductive member in all the locations from the center part of the electrode group wound in the shape of a spiral.

このような電極群と導電部材との接続構造としては、たとえば、特許文献１に示すように、電極群の一部を収束し、収束した電極群の断面形状と同じ断面形状を有する導電部材を用いて、レーザ溶接で溶着する事例が既に提案されている。また、正極及び負極の端部に、円弧状に突出した形状の電流取出部を形成し、その電流取出部に導電部材（たとえば、リード線）を溶着する構造が、例えば、特許文献２に開示されている。さらに、電極群と導電部材の接続における従来技術として、正・負極板をセパレータで巻回した発電要素の上下端面に導電端縁を突出させ、集電体を端面に当接し溶接することが、例えば、特許文献３に提案されている。
特許第３７０２３０８号 特開平１１−７３９９５号 特開平７−１４５６９号公報 As such a connection structure between the electrode group and the conductive member, for example, as shown in Patent Document 1, a part of the electrode group is converged, and a conductive member having the same cross-sectional shape as that of the converged electrode group is used. There have already been proposed examples of welding using laser welding. Further, for example, Patent Document 2 discloses a structure in which a current extraction portion having a shape protruding in an arc shape is formed at the ends of the positive electrode and the negative electrode, and a conductive member (for example, a lead wire) is welded to the current extraction portion. Has been. Furthermore, as a prior art in the connection of the electrode group and the conductive member, the conductive edge is projected on the upper and lower end surfaces of the power generation element in which the positive and negative electrode plates are wound with the separator, and the current collector is in contact with the end surface and welded. For example, it is proposed in Patent Document 3.
Japanese Patent No. 3702308 JP-A-11-73959 JP-A-7-14569

しかしながら、上記特許文献１，２に開示されているように、負極及び正極の端部にタブを設けて、前記タブを収束して導電部材と溶接する構造では、タブの加工及びタブの収束に時間を要し、その結果量産性を向上することが難しかった。また、タブの加工の際に切り取った部材は、廃棄材料となるため材料に無駄が生じやすかった。さらに、タブ加工に伴うコンタミにより、渦巻き状に巻いている電極群内で接触不良を引き起こすことが懸念されていた。さらに、上記特許文献１，２に示した構造では、電極群を収束する工程や収束部材に見合った断面形状を有する導電部材を製作する必要があり、製造工程が増えることになる。   However, as disclosed in Patent Documents 1 and 2, in the structure in which tabs are provided at the ends of the negative electrode and the positive electrode and the tabs are converged and welded to the conductive member, the tabs are processed and the tabs are converged. It took time, and as a result, it was difficult to improve mass productivity. In addition, since the member cut out when the tab is processed becomes a waste material, the material is likely to be wasted. Furthermore, there has been a concern that contamination due to tab processing may cause poor contact in a spirally wound electrode group. Furthermore, in the structures shown in Patent Documents 1 and 2, it is necessary to manufacture a conductive member having a cross-sectional shape corresponding to the step of converging the electrode group and the converging member, which increases the number of manufacturing steps.

また、上記特許文献３に開示された正負極板における上下端面の導電端縁と集電端子との接続は、集電端子が櫛歯とスリットからなる複雑な構造を前提にしており、製造工程の複雑化、増加という課題が生じる。   In addition, the connection between the conductive end edges of the upper and lower end surfaces and the current collecting terminal in the positive and negative electrode plates disclosed in Patent Document 3 is based on a complicated structure in which the current collecting terminal is composed of comb teeth and slits. The problem of increased complexity and increase arises.

本発明の目的は、生産性に優れ、かつ電気抵抗が低い電極群と導電部材とを接続する接続構造、及び量産性、信頼性に優れた導電部材の構造を提案することにある。   An object of the present invention is to propose a connection structure for connecting an electrode group having excellent productivity and low electrical resistance to a conductive member, and a structure of a conductive member excellent in mass productivity and reliability.

前記課題を解決するために、本発明は主として次のような構成を採用する。
箔状の正極と負極の間にセパレータを挟みこんで巻回された電極群と、前記電極群の幅方向の端部と電気的導通を図る導電部材と、を備えた非水電解質二次電池において、
前記導電部材は、前記巻回電極群の中央部から外周部の端部に当接する放射形状の複数の足部が形成され、前記足部は、放射形状の先端部がその中央部よりも前記巻回電極群の端部寄りになるように傾斜した構造であり、前記導電部材の足部と前記電極群の端部とが溶着され、前記電極群の幅方向端部は、前記導電部材の足部に対向する部分で、電極群中央部側に折れ曲がって当接している非水電解質二次電池。 In order to solve the above problems, the present invention mainly adopts the following configuration.
A non-aqueous electrolyte secondary battery comprising: an electrode group wound with a separator sandwiched between a foil-like positive electrode and a negative electrode; and a conductive member that is electrically connected to an end in the width direction of the electrode group In
The conductive member is formed with a plurality of radial feet abutting from a central portion of the wound electrode group to an end portion of the outer peripheral portion, and the distal end portion of the radial portion is more than the central portion thereof. It is a structure inclined so that it may become near the edge part of a winding electrode group, the foot part of the said electroconductive member and the edge part of the said electrode group are welded, and the width direction edge part of the said electrode group is the said electroconductive member A non-aqueous electrolyte secondary battery that is bent and in contact with the center of the electrode group at a portion facing the leg portion of the electrode .

また、前記非水電解質二次電池において、前記導電部材の足部の断面は、丸型、Ｖ型または矩形状の断面である非水電解質二次電池。 Further, in the non-aqueous electrolyte secondary battery, the cross section of the foot portion of the conductive member is a round, V-shaped or rectangular cross section .

本発明によれば、電極群に導電部材との電気的な接続を図るための電流取り出し部の加工を施す必要がなく、生産性が飛躍的に向上する。また、電極群端部の剛性による反力を最小とした状態で、導電部材を溶着することが可能となり、電極群と導電部材との安定した接続構造を提供することができる。   According to the present invention, it is not necessary to process the current extraction portion for electrically connecting the electrode group to the conductive member, and the productivity is dramatically improved. Further, the conductive member can be welded in a state where the reaction force due to the rigidity of the electrode group end is minimized, and a stable connection structure between the electrode group and the conductive member can be provided.

また、電極群と導電部材とは安定した接続をしているので、電池内の電気抵抗を格段に減少することができ、電池の放電容量を増大することができる。さらに、電極群の端部が平面であるので、電極群と導電部材との接続部（溶着部）を小さくすることができ、体積効率を高めることができる。   Further, since the electrode group and the conductive member are stably connected, the electric resistance in the battery can be significantly reduced, and the discharge capacity of the battery can be increased. Furthermore, since the end portion of the electrode group is a flat surface, the connection portion (welded portion) between the electrode group and the conductive member can be reduced, and the volume efficiency can be increased.

本発明の実施形態に係る非水電解質二次電池について、図１〜図８を参照しながら以下詳細に説明する。図１は本発明の実施形態に係る非水電解質二次電池における電極群と導電部材を含む斜視図である。図２は本実施形態に係る非水電解質二次電池における電極群と導電部材の溶着状態を示す断面図である。図３は本実施形態に係る非水電解質二次電池における電極群と導電部材の接触状態を示す断面図である。   A nonaqueous electrolyte secondary battery according to an embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a perspective view including an electrode group and a conductive member in a nonaqueous electrolyte secondary battery according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a welded state of the electrode group and the conductive member in the nonaqueous electrolyte secondary battery according to the present embodiment. FIG. 3 is a cross-sectional view showing a contact state between the electrode group and the conductive member in the nonaqueous electrolyte secondary battery according to the present embodiment.

また、図４は本実施形態に係る非水電解質二次電池における巻回された電極群の変形状況を説明する見取図である。図５は本実施形態に係る非水電解質二次電池における導電部材の一の構成例を示す図である。図６は本実施形態に係る非水電解質二次電池における導電部材の他の構成例を示す図である。図７は本実施形態に係る非水電解質二次電池における導電部材の別の構成例を示す図である。図８は本実施形態に係る非水電解質二次電池における導電部材の種々の断面形状を示す図である。   FIG. 4 is a sketch for explaining the deformation state of the wound electrode group in the nonaqueous electrolyte secondary battery according to this embodiment. FIG. 5 is a view showing one configuration example of a conductive member in the nonaqueous electrolyte secondary battery according to the present embodiment. FIG. 6 is a diagram showing another configuration example of the conductive member in the nonaqueous electrolyte secondary battery according to the present embodiment. FIG. 7 is a diagram showing another configuration example of the conductive member in the nonaqueous electrolyte secondary battery according to the present embodiment. FIG. 8 is a diagram showing various cross-sectional shapes of the conductive member in the nonaqueous electrolyte secondary battery according to the present embodiment.

本発明の実施形態に係る非水電解質二次電池としてリチウムイオン電池を例として取り上げて、本発明の実施形態について以下説明する。   The embodiment of the present invention will be described below by taking a lithium ion battery as an example of the non-aqueous electrolyte secondary battery according to the embodiment of the present invention.

まずはじめに、本実施形態に係る非水電解質二次電池の一例としてのリチウムイオン電池に関する動作原理について簡単に説明する。正極及び負極は金属製の箔（例えば、正極はアルミニウム、負極は銅）に電極材料（活性物質）が塗布された構造を有し、正極はＬｉＣｏＯ２やＬｉＭｎ２Ｏ４、負極はＣからなり、これらの正極と負極はＬｉイオンを含んだ有機電解液に浸されている。 First, an operation principle regarding a lithium ion battery as an example of the nonaqueous electrolyte secondary battery according to the present embodiment will be briefly described. The positive electrode and the negative electrode have a structure in which an electrode material (active substance) is applied to a metal foil (for example, the positive electrode is aluminum and the negative electrode is copper), the positive electrode is made of LiCoO 2 or LiMn 2 O 4 , and the negative electrode is made of C. These positive electrodes and negative electrodes are immersed in an organic electrolyte containing Li ions.

正極及び負極に用いられている活性物質は、Ｌｉイオンの受け渡しが可能な特性を有しており、Ｌｉイオンが結晶中の原子間に出入りすることで、電池として動作する。   The active substance used for the positive electrode and the negative electrode has a characteristic capable of delivering Li ions, and operates as a battery when Li ions enter and exit between atoms in the crystal.

図１に本実施形態に係る非水電解質二次電池の一例としてリチウムイオン電池の斜視図を示し、リチウムイオン電池の正極側を示したものである。リチウムイオン電池は、正極１及び負極２の間にセパレータ３ａ，３ｂを挟み込んで巻かれた電極群４と、電極群４の端部と電気的に導通するために溶着された導電部材５と、蓋６と、電池容器７と、絶縁を兼ねたパッキン８と、から構成される。   FIG. 1 shows a perspective view of a lithium ion battery as an example of the nonaqueous electrolyte secondary battery according to the present embodiment, and shows a positive electrode side of the lithium ion battery. The lithium ion battery includes an electrode group 4 wound with the separators 3a and 3b sandwiched between the positive electrode 1 and the negative electrode 2, a conductive member 5 welded to be electrically connected to an end of the electrode group 4, It is comprised from the lid | cover 6, the battery container 7, and the packing 8 which served as insulation.

次に、本実施形態に係るリチウムイオン電池の製造方法について説明する。正極１は厚さ２０μｍのアルミニウム箔、負極２は厚さ１０μｍの銅箔からなり、これらの表面には電極材料が塗布されている。本実施形態では、正極１には約粒径１０μｍのＬｉＭｎ２Ｏ４の粉末に、粒径数μｍの炭素粉末と結着剤のポリフッ化ビニリデンを溶媒に分散させたものを塗布し、一方、負極には粒径２０μｍの炭素粒子と結着剤を溶媒に分散させた混合物を塗布した。塗布法はローラを用いた転写法とし、正極１及び負極２の幅方向（図示する方向）の片側に未塗布部（図示する部位）を形成するように帯状に塗布した。なお、上述した活性物質はこれに限るものではない。 Next, a method for manufacturing a lithium ion battery according to this embodiment will be described. The positive electrode 1 is made of an aluminum foil having a thickness of 20 μm, and the negative electrode 2 is made of a copper foil having a thickness of 10 μm, and an electrode material is applied to these surfaces. In this embodiment, the positive electrode 1 is coated with a LiMn 2 O 4 powder having a particle size of about 10 μm and a carbon powder having a particle size of several μm and a binder polyvinylidene fluoride dispersed in a solvent, A mixture in which carbon particles having a particle diameter of 20 μm and a binder were dispersed in a solvent was applied to the negative electrode. The application method was a transfer method using a roller, and was applied in a strip shape so as to form an uncoated portion (portion shown) on one side of the positive electrode 1 and the negative electrode 2 in the width direction (shown direction). In addition, the active substance mentioned above is not restricted to this.

塗布後は乾燥処理を施し、正極１及び負極２を、塗布部の幅が約９０ｍｍになるように一端を切断した。次に、厚さ２５μｍのポリエチレン製微多孔薄膜であるセパレータ３ａ，３ｂを介して、正極１、セパレータ３ａ、負極２、セパレータ３ｂが積層した状態で渦巻き状に巻いて電極群４を製造した。ここで、電極群４の一方の端部は、正極１の活性物質の未塗布部（図示する部位であってセパレータから突出している突出部）、もう一方の端部は負極の活性物質の未塗布部が飛び出すように捲回した（不図示）。この未塗布部（突出部又は端部）が導電部材５との電気的な接続部となる。   After the application, a drying process was performed, and one end of each of the positive electrode 1 and the negative electrode 2 was cut so that the width of the application portion was about 90 mm. Next, the electrode group 4 was manufactured by spirally winding the positive electrode 1, the separator 3 a, the negative electrode 2, and the separator 3 b through the separators 3 a and 3 b that are polyethylene microporous thin films having a thickness of 25 μm. Here, one end of the electrode group 4 is an uncoated portion of the active material of the positive electrode 1 (a protruding portion protruding from the separator as shown), and the other end is an uncoated portion of the active material of the negative electrode. Winding was performed so that the application part jumped out (not shown). This uncoated portion (projecting portion or end portion) serves as an electrical connection portion with the conductive member 5.

次に、未塗布部（突出部又は端部、以下突出部と称する）の電極群４の端縁（先端部分）に導電部材５を押し当て、レーザ溶接法で溶着した（図２を参照）。その後は、電極群４と導電部材５を金属製の円筒状電池容器７内に収納し、電池容器７に電解液を注入後、電池容器７の内周部にパッキン８を設置し、蓋９をかしめて締結した。最後に、蓋９の中心部に設けた孔９から突き出た導電部材５の中央部の周囲をレーザ溶接した。なお、負極側の構造は図示していないが、ほぼ同様な形状を有している。   Next, the conductive member 5 was pressed against the edge (tip portion) of the electrode group 4 of the uncoated portion (protruding portion or end portion, hereinafter referred to as the protruding portion) and welded by laser welding (see FIG. 2). . Thereafter, the electrode group 4 and the conductive member 5 are accommodated in a metal cylindrical battery container 7, an electrolyte is injected into the battery container 7, a packing 8 is installed on the inner periphery of the battery container 7, and a lid 9 We conclude by caulking. Finally, the periphery of the central portion of the conductive member 5 protruding from the hole 9 provided in the central portion of the lid 9 was laser-welded. The structure on the negative electrode side is not shown, but has a substantially similar shape.

次に、本実施形態に係る非水電解質二次電池における導電部材の形状と作用について説明する。図２に渦巻き状に巻かれた電極群４と導電部材５の溶着部の断面を示す。図２は電極群４の断面を模式的に示したもので、セパレータは図示していない。図２に示すように、電極群４の端縁（電極群の突出部の先端部分）はほぼ平面であり（図２の（１）に示すように、正極１の先端部分は、電極群４の巻回軸の内周側から外周側に亘って当該軸に直交する平面に揃って位置している）、その電極群の先端部分の平面形状に対して導電部材５の傾斜した足部５ａ（図１の図示例では８本の足部）をＬ１の方向に押しつけると（図２の（２）を参照）、電極群４の突出部（未塗装部）にはＬ２の方向、すなわち巻回電極群４の中心側へすべるように電極群４の突出部が折り曲がるようになる。   Next, the shape and action of the conductive member in the nonaqueous electrolyte secondary battery according to this embodiment will be described. FIG. 2 shows a cross section of the welded portion between the electrode group 4 and the conductive member 5 wound in a spiral. FIG. 2 schematically shows a cross section of the electrode group 4, and the separator is not shown. As shown in FIG. 2, the edge of the electrode group 4 (the tip portion of the protruding portion of the electrode group) is substantially flat (as shown in (1) of FIG. 2), the tip portion of the positive electrode 1 is the electrode group 4. The conductive member 5 is inclined with respect to the planar shape of the tip end portion of the electrode group. When the eight legs in the example shown in FIG. 1 are pressed in the direction L1 (see (2) in FIG. 2), the protruding part (unpainted part) of the electrode group 4 is in the direction L2, ie, the winding. The protruding portion of the electrode group 4 is bent so as to slide toward the center side of the rotating electrode group 4.

ここで、導電部材５をＬ１の方向に押しつけると導電部材５の足部５ａ（電極群の巻回軸の中心から放射状に延びた複数の足形状のものであって、電極群先端部分の面に対して傾斜しているもの）が電極群４の先端部分の平面に対して傾斜しているので、電極群４にはわずかであるが、Ｌ２の方向へ折り曲がる力が作用している。その結果、電極群４の突出部は折り曲がり、電極群４と導電部材５は図２の（２）に示した形状のように接触する。なお、図２の（２）では、足部５ａは傾斜しているが、Ｌ１方向の押し付けによって足部５ａが結果的にほぼ平面になっても本実施形態の技術思想の範囲内である。   Here, when the conductive member 5 is pressed in the direction of L1, the foot portion 5a of the conductive member 5 (a plurality of foot-shaped members extending radially from the center of the winding axis of the electrode group, Is inclined with respect to the plane of the tip portion of the electrode group 4, a slight bending force acts on the electrode group 4 in the direction of L 2. As a result, the protruding portion of the electrode group 4 is bent, and the electrode group 4 and the conductive member 5 are in contact with each other as shown in FIG. In FIG. 2 (2), the foot 5a is inclined, but even if the foot 5a becomes substantially flat as a result of pressing in the L1 direction, it is within the scope of the technical idea of this embodiment.

図３に導電部材５と電極群４との接触状態を示す。図３の（１）に示すように導電部材５が電極群４と垂直に接触する場合（導電部材の足が傾斜していない場合）は、電極群４の端部は座屈するような形状で接触するが、一方、図３の（２）に示すように、導電部材５の足部５ａが傾斜している場合には、中心側へすべるように電極群４が折り曲がる。   FIG. 3 shows a contact state between the conductive member 5 and the electrode group 4. As shown in (1) of FIG. 3, when the conductive member 5 is in perpendicular contact with the electrode group 4 (when the legs of the conductive member are not inclined), the end of the electrode group 4 is shaped to buckle. On the other hand, as shown in (2) of FIG. 3, when the foot portion 5a of the conductive member 5 is inclined, the electrode group 4 is bent so as to slide toward the center.

ここで、電極群４の突出部は、図３の（３）に示すように予めコの字型に折り曲げた形状としても良い。この場合には図示するように電極群の突出部が変形して導電部材の足部５ａと当接状態となる。さらには、電極群４の突出部は、予め折り曲がりやすいように中心側に変形させておいても良い。なお、本実施形態では、３ｋＷのレーザ溶接機を用いて電極群４と導電部材５とを溶着した。溶着後の溶接状態を破壊検査及び断面観察により実施した結果、電極群４と導電部材５は良好に溶着していた。   Here, the protruding portion of the electrode group 4 may have a shape that is previously bent into a U shape as shown in FIG. In this case, as shown in the figure, the protruding portion of the electrode group is deformed to come into contact with the foot portion 5a of the conductive member. Furthermore, the protruding portion of the electrode group 4 may be deformed in advance toward the center so as to be easily bent. In this embodiment, the electrode group 4 and the conductive member 5 are welded using a 3 kW laser welding machine. As a result of carrying out the welding state after welding by destructive inspection and cross-sectional observation, the electrode group 4 and the conductive member 5 were well welded.

次に、本実施形態の導電部材５の作用について説明する。図４に電極群４の変形の様相を示す。図示するように、電極群４は巻回された状態であるため、電極群の先端部分（図示例では上方側の先端部分）は、外周側には変形しにくいが内周側には容易に変形しやすい属性をもっている（電極群の先端部分が中心方向には倒れ込み易い）。また、電極群４の先端部分の全周面を内周側に変形することは難しく、先端部分面内の一部分のみであれば容易に変形することができる。すなわち、導電部材５に導電用の傾斜した足部５ａを設けることで、確実に且つ容易に電極群４と導電部材５とを接触させることができる。なお、足部５ａを傾斜させない水平構造として電極群の先端部分面の鉛直方向からと押し付けると電極群の先端部分は変形し難い。   Next, the operation of the conductive member 5 of this embodiment will be described. FIG. 4 shows how the electrode group 4 is deformed. As shown in the drawing, since the electrode group 4 is in a wound state, the tip portion of the electrode group (the tip portion on the upper side in the illustrated example) is not easily deformed on the outer peripheral side, but easily on the inner peripheral side. It has an attribute that easily deforms (the tip of the electrode group tends to fall in the center direction). In addition, it is difficult to deform the entire peripheral surface of the tip portion of the electrode group 4 to the inner peripheral side, and it can be easily deformed if only a part in the tip portion surface. That is, by providing the conductive member 5 with the inclined legs 5a for conduction, the electrode group 4 and the conductive member 5 can be brought into contact with each other reliably and easily. In addition, if it presses from the perpendicular direction of the front-end | tip part surface of an electrode group as a horizontal structure which does not incline the leg part 5a, the front-end | tip part of an electrode group will be hard to deform | transform.

電極群４の先端部分の面精度は、電極群４を製造する装置制約上、完全な平面に形成することができない。それゆえ、電極群４の先端部分表面は、０．１〜０．５ｍｍ程度の凹凸を有している。一方、電極群４として形成した後の先端部分は巻いているため、軸方向の剛性が強く、加圧しても変形しにくい。すなわち、平面を有する導電部材（たとえば、円板）を電極群４の端部に鉛直方向から押しつけても、導電部材５と電極群４とを密着させることができない（先端部分表面の凹凸のため）。たとえば、５〜１０ｋｇ程度の荷重で押しつけても完全に導電部材と電極群とを密着させることができないことを確認している。そのため、導電部材５と電極群４とを接触していない状態で溶着しても、導電部材５と電極群４にはクリアランスが生じているので、溶接不良が生じてしまう。   The surface accuracy of the tip portion of the electrode group 4 cannot be formed on a perfect plane due to the restrictions on the apparatus for manufacturing the electrode group 4. Therefore, the tip portion surface of the electrode group 4 has irregularities of about 0.1 to 0.5 mm. On the other hand, since the tip portion formed as the electrode group 4 is wound, the rigidity in the axial direction is strong, and it is difficult to be deformed even when pressed. That is, even if a conductive member (for example, a disk) having a flat surface is pressed against the end of the electrode group 4 from the vertical direction, the conductive member 5 and the electrode group 4 cannot be brought into close contact (because of the unevenness of the tip portion surface). ). For example, it has been confirmed that the conductive member and the electrode group cannot be brought into close contact with each other even when pressed with a load of about 5 to 10 kg. Therefore, even if welding is performed in a state where the conductive member 5 and the electrode group 4 are not in contact with each other, there is a clearance between the conductive member 5 and the electrode group 4, resulting in poor welding.

そこで、本実施形態に示したように、導電部材５に放射状に傾斜した足部５ａを設け、足部５ａと電極群４との先端部分を接触させると、電極群４は巻いているため外周側には変形しにくいが、内周側には容易に変形するので、良好に電極群４と導電部材５が接触することが可能となる。すなわち、導電部材５の足部５ａが傾斜していない場合は、導電部材５と電極群４は、クリアランスが生じる場合があり、さらに接触していても線で接触しているため溶接不良が生じやすい。一方、導電部材５の足部５ａが傾斜している場合は、導電部材５と電極群４は面で接触するので、安定した溶接が可能となる。   Therefore, as shown in the present embodiment, when the conductive member 5 is provided with the radially inclined foot portions 5a and the tip portions of the foot portions 5a and the electrode group 4 are brought into contact with each other, the electrode group 4 is wound. The electrode group 4 and the conductive member 5 can be satisfactorily brought into contact with each other because the electrode group 4 is easily deformed on the inner peripheral side. That is, when the foot part 5a of the conductive member 5 is not inclined, there may be a clearance between the conductive member 5 and the electrode group 4, and even if they are in contact with each other, they are in contact with each other, resulting in poor welding. Cheap. On the other hand, when the foot 5a of the conductive member 5 is inclined, the conductive member 5 and the electrode group 4 are in contact with each other, so that stable welding is possible.

次に、導電部材５の形状と材質について説明する。導電部材５は、正極１及び負極２の材質と溶接性や電気抵抗の点から、同一な材質であることが好ましい。たとえば、正極１の場合は電気抵抗の低い高純度のアルミニウムが好ましい。また、負極２に用いる導電部材の場合は、銅であることが好ましいが、この場合はレーザの反射率が大きいので、表面にニッケルめっきやニッケルと銅のクラッド材を用いて導電部材５を加工すると良い。また、導電部材５の足部５ａの断面形状は、円形に限らず、たとえば、図５に示すように平板をＶ型に折り曲げた形状としても良い。図５に示した構成例は、厚さ０．５ｍｍの純アルミニウムを成形したものである。   Next, the shape and material of the conductive member 5 will be described. The conductive member 5 is preferably made of the same material as the positive electrode 1 and the negative electrode 2 in terms of weldability and electric resistance. For example, in the case of the positive electrode 1, high-purity aluminum having a low electric resistance is preferable. Further, in the case of the conductive member used for the negative electrode 2, copper is preferable, but in this case, since the reflectance of the laser is large, the conductive member 5 is processed using nickel plating or a clad material of nickel and copper on the surface. Good. Further, the cross-sectional shape of the foot 5a of the conductive member 5 is not limited to a circle, and for example, a flat plate may be bent into a V shape as shown in FIG. The configuration example shown in FIG. 5 is obtained by molding pure aluminum having a thickness of 0.5 mm.

さらには、図６に示すように、導電部材５の足部５ａは針金のような形状でも良い。この場合は、電極群４と針金部の接触部には適度な厚さの箔１０（例えば０．１〜０．３ｍｍ）を設けて同時に溶着させても良い。さらに、図７に示すような形状でも良い。図７に示す導電部材５は、電極群４と接触する足部５ａが傾斜しており、図１と同様な効果を有している。図７で、足部５ａを互いに連結する環状部材は足部の強度補強用であり、円形の孔は電解液の注入孔である。また、図８に導電部材５の足部断面の形状の一例を示す。導電部材５の足部５ａは、電極群４の端部表面と接触しやすいように丸型、Ｖ型及び矩形状の断面をとしても良い。   Furthermore, as shown in FIG. 6, the foot part 5a of the conductive member 5 may have a wire-like shape. In this case, a foil 10 (for example, 0.1 to 0.3 mm) having an appropriate thickness may be provided at the contact portion between the electrode group 4 and the wire portion and welded simultaneously. Furthermore, a shape as shown in FIG. The conductive member 5 shown in FIG. 7 has the same effect as that of FIG. 1 because the foot part 5a in contact with the electrode group 4 is inclined. In FIG. 7, the annular member that connects the foot portions 5a to each other is for reinforcing the strength of the foot portions, and the circular hole is an injection hole for electrolyte. FIG. 8 shows an example of the shape of the foot cross section of the conductive member 5. The foot 5a of the conductive member 5 may have a round, V-shaped, or rectangular cross section so that it can easily come into contact with the end surface of the electrode group 4.

以上説明したように、本発明の実施形態に係る非水電解質二次電池は、次のような構成と機能を備えていることを特徴とするものである。すなわち、活性物質の塗布された箔状の正極と負極間に樹脂製のセパレータを挟みこんで巻かれた電極群と、前記電極群の端部表面と電気的な導通を図る導電部材を有する非水電解質二次電池おいて、前記導電部材には、電極群の端部表面の中心から外周方向に向かって接触する複数の足部が放射状に設けられ、かつ前記足部と電極群の端部表面で溶着している。また、前記電極群の足部は、中心部に比べ外周部が低くなるように傾斜し、さらに、前記電極群の足部の断面は、電極群の端部表面と接触しやすいように丸型、Ｖ型及び矩形状等の断面を有している。これにより、電極群と導電部材は良好に接触することができ、低抵抗で高信頼な接続構造を提供できる。また、導電部材との溶着以前における前記電極群の端部はほぼ平面としている。これにより、渦巻き状に巻いた電極群に導電部材との接続用の加工を施す必要がない。   As described above, the nonaqueous electrolyte secondary battery according to the embodiment of the present invention is characterized by having the following configuration and function. That is, a non-conductive electrode having an electrode group wound with a resin separator sandwiched between a foil-like positive electrode and a negative electrode coated with an active substance, and a conductive member for electrically connecting the end surface of the electrode group In the water electrolyte secondary battery, the conductive member is provided with a plurality of feet radially contacting the outer peripheral direction from the center of the end surface of the electrode group, and the foot and the end of the electrode group Welded on the surface. Further, the foot portion of the electrode group is inclined so that the outer peripheral portion is lower than the center portion, and the cross section of the foot portion of the electrode group is round so as to be easily in contact with the end surface of the electrode group. It has a V-shaped and rectangular cross section. As a result, the electrode group and the conductive member can be in good contact with each other, and a connection structure with low resistance and high reliability can be provided. Further, the end portion of the electrode group before welding with the conductive member is substantially flat. Thereby, it is not necessary to perform the process for a connection with an electrically-conductive member to the electrode group wound by the spiral shape.

また、活性物質が塗布された箔状の正極と負極間にセパレータを挟みこんで巻かれた電極群と、前記電極群の端部表面と電気的な導通を図る導電部材を有する非水電解質二次電池おいて、前記電極群の端部はほぼ平面であり、前記平面部に導電部材を溶着している。また、前記電極群と導電部材との溶着部は、電極群の端部の一部が折り曲がり、かつ外周側より中心側が高くなる状態で折り曲がった状態で溶着している。これにより、電極群端部の剛性による反力を最小とした状態で、導電部材を溶着することが可能となり、電極群に導電部材との接続用の加工を施す必要がない。   In addition, the non-aqueous electrolyte has an electrode group wound with a separator sandwiched between a foil-like positive electrode and a negative electrode coated with an active substance, and a conductive member that is electrically connected to an end surface of the electrode group. In the secondary battery, the end portion of the electrode group is substantially flat, and a conductive member is welded to the flat portion. Further, the welded portion between the electrode group and the conductive member is welded in a state where a part of the end portion of the electrode group is bent and the center side is higher than the outer peripheral side. Accordingly, the conductive member can be welded in a state where the reaction force due to the rigidity of the electrode group end portion is minimized, and it is not necessary to perform processing for connection with the conductive member on the electrode group.

以上のように、本発明の実施形態における電極群と導電部材を採用すると、従来のような電極群に導通用タブの形成や導電を図るための特別な加工を施す必要がないので、電極群の量産性が向上し、さらには導通用タブの形成に伴うコンタミ発生等がなく、電極群の加工歩留まりが飛躍的に向上する。また、電極群と導電部材が小さな力で良好に接触することができるので、溶接不良を低減でき、良好な性能を得ることができる。   As described above, when the electrode group and the conductive member in the embodiment of the present invention are employed, it is not necessary to perform special processing for forming a conduction tab or conducting the electrode in the conventional electrode group. In addition, there is no contamination due to the formation of the conductive tab, and the processing yield of the electrode group is dramatically improved. Moreover, since an electrode group and a conductive member can be satisfactorily contacted with a small force, poor welding can be reduced and good performance can be obtained.

本発明の実施形態に係る非水電解質二次電池における電極群と導電部材を含む斜視図である。1 is a perspective view including an electrode group and a conductive member in a nonaqueous electrolyte secondary battery according to an embodiment of the present invention. 本実施形態に係る非水電解質二次電池における電極群と導電部材の溶着状態を示す断面図である。It is sectional drawing which shows the welding state of the electrode group and electrically conductive member in the nonaqueous electrolyte secondary battery which concerns on this embodiment. 本実施形態に係る非水電解質二次電池における電極群と導電部材の接触状態を示す断面図である。It is sectional drawing which shows the contact state of the electrode group and electrically conductive member in the nonaqueous electrolyte secondary battery which concerns on this embodiment. 本実施形態に係る非水電解質二次電池における巻回された電極群の変形状況を説明する見取図である。It is a sketch explaining the deformation | transformation condition of the wound electrode group in the nonaqueous electrolyte secondary battery which concerns on this embodiment. 本実施形態に係る非水電解質二次電池における導電部材の一の構成例を示す図である。It is a figure which shows one structural example of the electrically-conductive member in the nonaqueous electrolyte secondary battery which concerns on this embodiment. 本実施形態に係る非水電解質二次電池における導電部材の他の構成例を示す図である。It is a figure which shows the other structural example of the electrically-conductive member in the nonaqueous electrolyte secondary battery which concerns on this embodiment. 本実施形態に係る非水電解質二次電池における導電部材の別の構成例を示す図である。It is a figure which shows another structural example of the electrically-conductive member in the nonaqueous electrolyte secondary battery which concerns on this embodiment. 本実施形態に係る非水電解質二次電池における導電部材の種々の断面形状を示す図である。It is a figure which shows the various cross-sectional shapes of the electrically-conductive member in the nonaqueous electrolyte secondary battery which concerns on this embodiment.

符号の説明Explanation of symbols

１ 正極
２ 負極
３ａ，３ｂ セパレータ
４ 電極群
５ 導電部材
５ａ 足部
６ 蓋
７ 電池ケース
８ パッキン DESCRIPTION OF SYMBOLS 1 Positive electrode 2 Negative electrode 3a, 3b Separator 4 Electrode group 5 Conductive member 5a Foot 6 Lid 7 Battery case 8 Packing

Claims (4)

箔状の正極と負極の間にセパレータを挟みこんで巻回された電極群と、前記電極群の幅方向の端部と電気的導通を図る導電部材と、を備えた非水電解質二次電池において、
前記導電部材は、前記巻回電極群の中央部から外周部の端部に当接する放射形状の複数の足部が形成され、
前記足部は、放射形状の先端部がその中央部よりも前記巻回電極群の端部寄りになるように傾斜した構造であり、
前記導電部材の足部と前記電極群の端部とが溶着され、
前記電極群の幅方向端部は、前記導電部材の足部に対向する部分で、電極群中央部側に折れ曲がって当接している
ことを特徴とする非水電解質二次電池。 A non-aqueous electrolyte secondary battery comprising: an electrode group wound with a separator sandwiched between a foil-like positive electrode and a negative electrode; and a conductive member that is electrically connected to an end in the width direction of the electrode group In
The conductive member is formed with a plurality of radially shaped legs that contact the end of the outer periphery from the center of the wound electrode group,
The foot part is a structure that is inclined so that a radial tip part is closer to an end part of the wound electrode group than a center part thereof,
The foot of the conductive member and the end of the electrode group are welded ,
An end portion in the width direction of the electrode group is a portion facing the foot portion of the conductive member, and is bent and brought into contact with the central portion side of the electrode group. The nonaqueous electrolyte secondary battery, 請求項１において、
前記導電部材の足部の断面は、丸型、Ｖ型または矩形状の断面であることを特徴とする非水電解質二次電池。 In claim 1 ,
The non-aqueous electrolyte secondary battery is characterized in that a cross section of a foot portion of the conductive member is a round, V-shaped or rectangular cross section. 請求項１または２において、
前記足部に溶着された部位を除いて、前記電極群の端部はほぼ平面を形成していることを特徴とする非水電解質二次電池。 In claim 1 or 2 ,
A non-aqueous electrolyte secondary battery, wherein an end portion of the electrode group forms a substantially flat surface except for a portion welded to the foot portion. 活性物質の塗布された箔状の正極と負極の間にセパレータを挟み込むとともに正極又は負極の一方を幅方向に突出させて巻回し電極群を形成するステップと、
放射形状の複数の足部を形成した導電部材を前記電極群の突出した端部に押し当てて前記突出した端部を電極群の中央部寄りに折り曲げるステップと、
前記導電部材の足部と前記電極群の端部とを溶着するステップと、
前記電極群と前記導電部材を電池容器に収納して前記電池容器に電解液を注入するステップと、からなり、
前記突出した端部の折り曲げステップにおける導電部材の足部は、放射形状の先端部がその中央部よりも前記巻回電極群の端部寄りになるように傾斜した構造である
ことを特徴とする非水電解質二次電池の製造方法。 A step of sandwiching a separator between a foil-like positive electrode and a negative electrode coated with an active substance and projecting one of the positive electrode and the negative electrode in the width direction to form an electrode group;
Pressing the conductive member formed with a plurality of radially shaped legs against the protruding end of the electrode group and bending the protruding end closer to the center of the electrode group; and
Welding the foot of the conductive member and the end of the electrode group;
Storing the electrode group and the conductive member in a battery container and injecting an electrolyte into the battery container, and
The foot portion of the conductive member in the step of bending the protruding end portion has a structure in which the radial tip portion is inclined so that it is closer to the end portion of the wound electrode group than the center portion thereof. A method for producing a non-aqueous electrolyte secondary battery.
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