JP5668735B2 - Secondary battery - Google Patents

Secondary battery Download PDF

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JP5668735B2
JP5668735B2 JP2012210598A JP2012210598A JP5668735B2 JP 5668735 B2 JP5668735 B2 JP 5668735B2 JP 2012210598 A JP2012210598 A JP 2012210598A JP 2012210598 A JP2012210598 A JP 2012210598A JP 5668735 B2 JP5668735 B2 JP 5668735B2
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negative electrode
welding
current collector
resistance welding
heat
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JP2013041836A (en
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健二 南坂
健二 南坂
恭朋 谷口
恭朋 谷口
山内　康弘
康弘 山内
能間　俊之
俊之 能間
健次 稲垣
健次 稲垣
吉田　賢司
賢司 吉田
卓 近藤
近藤　　卓
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Sanyo Electric Co Ltd
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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
    • 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

Description

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

環境保護運動の高まりを背景として二酸化炭素ガス等の排出規制が強化されており、自動車業界ではガソリン、ディーゼル油、天然ガス等の化石燃料を使用する自動車だけでなく、電気自動車（ＥＶ）やハイブリッド電気自動車（ＨＥＶ）の開発が活発に行われている。加えて、近年の化石燃料の価格の急激な高騰はこれらのＥＶやＨＥＶの開発を進める追い風となっている。   Emission regulations such as carbon dioxide gas have been strengthened against the backdrop of the increasing environmental protection movement. In the automobile industry, not only automobiles that use fossil fuels such as gasoline, diesel oil, and natural gas, but also electric vehicles (EV) and hybrid vehicles. Electric vehicles (HEV) are being actively developed. In addition, the rapid rise in fossil fuel prices in recent years is a tailwind for the development of these EVs and HEVs.

このようなＥＶ、ＨＥＶ用電池としては、一般にニッケル−水素二次電池やリチウムイ
オン二次電池が使用されているが、環境対応だけでなく、自動車としての基本性能、すなわち、走りの能力の高度化も要求されるようになってきている。そのため、単に電池容量を大きくすることのみならず、自動車の加速性能や登坂性能に大きな影響を及ぼすために電池出力を大きくすることも必要である。ところが、高出力の放電を行うと電池に大電流が流れるため、発電要素の芯体と集電体との間の接触抵抗による発熱が大きくなる。したがって、ＥＶ、ＨＥＶ用電池は、大型で、大容量であるだけでなく、大電流を取り出せることが必要とされることから、電池内部の電力損失を防止して発熱を低下させるために、これらの発電要素の芯体と集電体との間の溶接不良を防止して内部抵抗を低下させることについても種々の改良が行われてきている。 As such EV and HEV batteries, nickel-hydrogen secondary batteries and lithium ion secondary batteries are generally used, but they are not only environmentally friendly but also have basic performance as an automobile, that is, high driving ability. There is also a need to make it easier. Therefore, it is necessary not only to increase the battery capacity but also to increase the battery output in order to greatly affect the acceleration performance and climbing performance of the automobile. However, when a high output discharge is performed, a large current flows through the battery, so that heat generation due to contact resistance between the core of the power generation element and the current collector increases. Therefore, since the batteries for EV and HEV are not only large and large in capacity, but also need to be able to take out a large current, in order to prevent power loss inside the battery and reduce heat generation, Various improvements have also been made to reduce internal resistance by preventing poor welding between the core of the power generation element and the current collector.

発電要素の芯体と集電体を電気的に接合する方法としては、機械的なカシメ、溶接等の方法があるが、高出力が要求される電池の集電方法としては融接である溶接が適している。また、リチウムイオン二次電池の負極側電極体材料としては、低抵抗化を実現するため銅ないし銅合金が使用されるが、銅ないし銅合金はその特性として、電気抵抗が小さく、熱伝導率が大きいため、溶接するためには非常に大きなエネルギーが必要となる。   As a method of electrically joining the core of the power generation element and the current collector, there are methods such as mechanical caulking and welding, but a current collecting method for batteries that require high output is fusion welding. Is suitable. In addition, as a negative electrode side electrode body material of a lithium ion secondary battery, copper or a copper alloy is used in order to realize a low resistance. However, copper or a copper alloy has low electrical resistance and thermal conductivity as its characteristics. Therefore, very large energy is required for welding.

このような発電要素の芯体と集電体との間の溶接方法としては、従来から以下の方法が知られている。
（１）レーザ溶接法（下記特許文献１参照）
（２）超音波溶接法（下記特許文献２参照）
（３）抵抗溶接法（下記特許文献３参照） As a welding method between the core of the power generation element and the current collector, the following methods are conventionally known.
(1) Laser welding method (see Patent Document 1 below)
(2) Ultrasonic welding method (see Patent Document 2 below)
(3) Resistance welding method (see Patent Document 3 below)

レーザ溶接法においては、被溶接材料である銅ないし銅合金は金属溶接用に広く使用されているＹＡＧ（イットリウム−アルミニウム−ガーネット）レーザ光に対する反射率が約９０％と高いため、高エネルギーのレーザ光が必要である。また、銅ないし銅合金をレーザ溶接すると、表面状態の影響により溶接性が大きく変わること、及び、他材質のレーザ溶接の場合と同様に、スパッタの発生が不可避であるという問題点が存在する。   In laser welding, copper or copper alloy, which is a material to be welded, has a high reflectivity of about 90% with respect to YAG (yttrium-aluminum-garnet) laser light, which is widely used for metal welding. I need light. In addition, when laser welding copper or copper alloy, there is a problem that weldability is greatly changed due to the influence of the surface state, and spattering is unavoidable as in the case of laser welding of other materials.

超音波溶接においても、被溶接材料である銅ないし銅合金の熱伝導率が大きいことから、大きなエネルギーが必要となり、また、溶接時の超音波振動によって負極活物質の脱落が生じる。そのため、下記特許文献２に開示されている発明では、超音波溶接時に発電要素である電極体を圧縮し、脱落した負極活物質が発電要素である電極体内に浸入しないようにしている。   Also in ultrasonic welding, since the thermal conductivity of copper or a copper alloy, which is a material to be welded, is large, a large amount of energy is required, and the negative electrode active material falls off due to ultrasonic vibration during welding. Therefore, in the invention disclosed in Patent Document 2 below, the electrode body that is a power generation element is compressed during ultrasonic welding so that the dropped negative electrode active material does not enter the electrode body that is the power generation element.

更に、抵抗溶接においては、被溶接材料である銅ないし銅合金の電気抵抗が小さいこと及び熱伝導率が大きいことから、短時間に大電流の投入が必要であること、溶接時に集電体と同材質である電極棒と集電体との融接が発生することがあること、溶接部以外での融解やスパークの発生が生じるという問題点が存在している。   Furthermore, in resistance welding, since the electrical resistance of copper or a copper alloy, which is a material to be welded, is small and the thermal conductivity is large, it is necessary to input a large current in a short time. There are problems that fusion welding between the electrode rod made of the same material and the current collector may occur, and melting and sparking occur outside the welded portion.

特開２００１−１６０３８７号公報JP 2001-160387 A 特開２００７−０５３００２号公報JP 2007-053002 A 特開２００６−３１０２５４号公報JP 2006-310254 A 特開２００２−００８７０８号公報JP 2002-008708 A

上述のように３種類の溶接方法には一長一短があるが、生産性及び経済性を考慮すると、従来から金属間の溶接法として広く使用されている抵抗溶接法を採用することが望まし
い。しかしながら、特に両端にそれぞれ正極芯体及び負極芯体の露出部を有するＥＶ、ＨＥＶ用の密閉電池の電極体（上記特許文献４参照）における銅ないし銅合金からなる芯体に対して銅製の集電体を抵抗溶接するには、電極体の積層数が多いため、確実に溶接させるためには多大な溶接エネルギーを必要とする。 As described above, the three types of welding methods have advantages and disadvantages. However, in view of productivity and economy, it is desirable to employ a resistance welding method that has been widely used as a welding method between metals. However, in particular, in the case of an electrode body of a sealed battery for EV and HEV having exposed portions of the positive electrode core body and the negative electrode core body at both ends (see Patent Document 4 above), a copper collection is used for the core body made of copper or copper alloy. In order to resistance-weld an electric body, a large number of electrode bodies are stacked, so that a large amount of welding energy is required for reliable welding.

本発明は、芯体露出部に集電体が抵抗溶接により接続された二次電池を提供することを目的とする。   An object of the present invention is to provide a secondary battery in which a current collector is connected to a core exposed portion by resistance welding.

上記目的を達成するため、本発明の二次電池は、正極板と負極板とをセパレータを介して巻回した偏平状の巻回電極体と、前記巻回電極体の一端側に設けられた正極芯体露出部に接続された正極集電体と、前記巻回電極体の他端側に設けられた負極芯体露出部に接続された負極集電体と、を有し、前記正極集電体及び前記負極集電体の少なくとも一方は、前記正極芯体露出部又は前記負極芯体露出部と抵抗溶接により接続される第１領域を有し、該第１領域の端部のうち前記巻回電極体の巻回軸方向中央側には折れ曲がり部が形成されている。   In order to achieve the above object, a secondary battery of the present invention is provided on a flat wound electrode body in which a positive electrode plate and a negative electrode plate are wound via a separator, and on one end side of the wound electrode body. A positive electrode current collector connected to the positive electrode core exposed portion; and a negative electrode current collector connected to a negative electrode core exposed portion provided on the other end side of the wound electrode body. At least one of the electric current collector and the negative electrode current collector has a first region connected by resistance welding to the positive electrode core exposed portion or the negative electrode core exposed portion, and of the end portions of the first region, A bent portion is formed on the center side in the winding axis direction of the wound electrode body.

本発明の二次電池においては、正極集電体及び負極集電体の少なくとも一方は、正極芯体露出部又は負極芯体露出部と抵抗溶接により接続される第１領域を有し、該第１領域の端部のうち前記巻回電極体の巻回軸方向中央側には折れ曲がり部が形成されている。 In the secondary battery of the present invention, at least one of the positive electrode current collector and the negative electrode current collector has a first region connected to the positive electrode core exposed part or the negative electrode core exposed part by resistance welding, A bent portion is formed on the center side in the winding axis direction of the wound electrode body in the end portion of one region .

また、本発明の二次電池においては、前記正極集電体及び前記負極集電体の少なくとも一方と抵抗溶接部分の周囲の前記正極芯体露出部又は前記負極芯体露出部との間には、絶縁シール材が配置されていることが好ましい。   Further, in the secondary battery of the present invention, between at least one of the positive electrode current collector and the negative electrode current collector and the positive electrode core exposed portion or the negative electrode core exposed portion around the resistance welding portion. It is preferable that an insulating sealing material is disposed.

巻回電極体の積層数が多くなると、確実に溶接させるためには多大な溶接エネルギーを与える必要があるため、抵抗溶接時にスパッタされたチリの発生が増加する。しかしながら、係る態様の二次電池によれば、抵抗溶接部分の周囲の正極芯体露出部及び負極芯体露出部と正極集電体及び負極集電体との間には絶縁シール材が配置されているので、抵抗溶接時に発生したチリは抵抗溶接部の周囲の絶縁シール材中に捕獲されるため、外部に飛散することがない。従って、係る態様の二次電池によれば、内部短絡の発生が少なく、信頼性の高い二次電池が得られる。また、抵抗溶接部分の周囲の正極芯体露出部及び負極芯体露出部と正極集電体及び負極集電体との一方の間に絶縁シール材が配置された場合であっても、抵抗溶接時に発生したチリは抵抗溶接部の周囲の絶縁シール材中に捕獲されるため、電極体の内部ないし外部に飛散するチリを少なくする効果が得られる。   When the number of the wound electrode bodies is increased, it is necessary to give a large amount of welding energy in order to surely weld, so that the generation of dust sputtered during resistance welding increases. However, according to the secondary battery of this aspect, the insulating seal material is disposed between the positive electrode core exposed portion and the negative electrode core exposed portion around the resistance welding portion and the positive electrode current collector and the negative electrode current collector. Therefore, dust generated during resistance welding is trapped in the insulating sealing material around the resistance welded portion, so that it does not scatter outside. Therefore, according to the secondary battery of this aspect, a secondary battery with high internal reliability and less reliability is obtained. Further, even if an insulating sealant is disposed between the positive electrode core exposed portion and the negative electrode core exposed portion around the resistance welded portion and the positive electrode current collector and the negative electrode current collector, resistance welding is performed. Since dust generated sometimes is trapped in the insulating sealing material around the resistance welded portion, the effect of reducing dust scattered inside or outside the electrode body can be obtained.

図１Ａは実施例に係る密閉電池としての角形電池の内部構造を示す正面図で あり、図１Ｂは図１ＡのＩＢ−ＩＢ線に沿った断面図である。FIG. 1A is a front view showing the internal structure of a prismatic battery as a sealed battery according to an embodiment, and FIG. 1B is a cross-sectional view taken along line IB-IB in FIG. 1A. 実施例の角形電池の図１ＡにおけるＩＩ−ＩＩ線に沿った拡大断面図である。It is an expanded sectional view in alignment with the II-II line in FIG. 1A of the square battery of an Example. 図２のＩＩＩ部分の拡大分解断面図である。FIG. 3 is an enlarged exploded cross-sectional view of a portion III in FIG. 2. 実施例の抵抗溶接部の剥離面の拡大写真である。It is an enlarged photograph of the peeling surface of the resistance welding part of an Example. 絶縁シール材としての熱溶着性樹脂からなるテープが軟化した状態を示す図 ２に対応する拡大断面図である。It is an expanded sectional view corresponding to FIG. 2 which shows the state which the tape which consists of heat welding resin as an insulating sealing material softened. 変更例２の角形電池の図３に対応する拡大断面図である。It is an expanded sectional view corresponding to FIG. 3 of the square battery of the example 2 of a change. 平面視における絶縁シール材、表面が平らな凸部及び突起との配置関係を示 す図である。It is a figure which shows the arrangement | positioning relationship with the insulating sealing material in a planar view, the convex part with the flat surface, and protrusion. 変更例３の角形電池の図２に対応する拡大断面図である。It is an expanded sectional view corresponding to FIG. 2 of the square battery of the example 3 of a change. 図８のＩＸ部分の拡大断面図である。It is an expanded sectional view of the IX part of FIG. 変更例４を示す図２に対応する拡大断面図である。It is an expanded sectional view corresponding to Drawing 2 showing example 4 of a change.

以下、実施例について図面を参照して本発明の最良の実施形態を説明する。ただし、以下に示す実施例は、本発明の技術思想を具体化するための密閉電池としての角形非水電解質二次電池の製造方法を例示するものであって、本発明をこの角形非水電解質二次電池の製造方法に特定することを意図するものではなく、特許請求の範囲に含まれるその他の実施形態のものも等しく適応し得るものである。   Embodiments of the present invention will be described below with reference to the drawings. However, the examples shown below exemplify a method for manufacturing a rectangular non-aqueous electrolyte secondary battery as a sealed battery for embodying the technical idea of the present invention. The present invention is not limited to this rectangular non-aqueous electrolyte. It is not intended to be specific to a method of manufacturing a secondary battery, and other embodiments within the scope of the claims are equally applicable.

なお、図１Ａは実施例の密閉電池としての角形電池の内部構造を示す正面図であり、図１Ｂは図１ＡのＩＢ−ＩＢ線に沿った断面図である。図２は実施例の角形電池の図１ＡにおけるＩＩ−ＩＩ線に沿った拡大断面図である。図３は図２のＩＩＩ部分の拡大分解断面図である。図４は実施例の抵抗溶接部の剥離面の拡大写真である。図５は絶縁シール材としての熱溶着性樹脂からなるテープが軟化した状態を示す図２に対応する拡大断面図である。図６は実施例を変更した変更例２の角形電池の図３に対応する拡大断面図である。図７は平面視における絶縁シール材、表面が平らな凸部及び突起との配置関係を示す図である。図８は実施例を変更した変更例３の角形電池の図２に対応する拡大断面図である。図９は図８のＩＸ部分の拡大断面図である。図１０は実施例を変更した変更例４を示す図２に対応する拡大断面図である。   1A is a front view showing an internal structure of a prismatic battery as a sealed battery of the embodiment, and FIG. 1B is a cross-sectional view taken along line IB-IB in FIG. 1A. FIG. 2 is an enlarged cross-sectional view taken along the line II-II in FIG. 1A of the prismatic battery of the example. FIG. 3 is an enlarged exploded cross-sectional view of a portion III in FIG. FIG. 4 is an enlarged photograph of the peeling surface of the resistance welded part of the example. FIG. 5 is an enlarged cross-sectional view corresponding to FIG. 2 showing a state in which a tape made of a heat-welding resin as an insulating sealing material is softened. FIG. 6 is an enlarged cross-sectional view corresponding to FIG. 3 of the prismatic battery of the second modification obtained by changing the embodiment. FIG. 7 is a diagram showing an arrangement relationship between the insulating sealing material, the convex portion having a flat surface, and the protrusion in a plan view. FIG. 8 is an enlarged cross-sectional view corresponding to FIG. 2 of the prismatic battery of the third modification obtained by changing the embodiment. FIG. 9 is an enlarged cross-sectional view of a portion IX in FIG. FIG. 10 is an enlarged cross-sectional view corresponding to FIG.

最初に実施例に係る密閉電池としての角形非水電解質二次電池を図１Ａ及び図１Ｂを用いて説明する。この角形非水電解質二次電池１０は、正極極板（図示せず）と負極極板（図示せず）とがセパレータ（図示せず）を介して巻回された偏平状の巻回電極体１１を、角形の電池外装缶１２の内部に収容し、封口板１３によって電池外装缶１２を密閉したものである。   First, a prismatic nonaqueous electrolyte secondary battery as a sealed battery according to an example will be described with reference to FIGS. 1A and 1B. This rectangular nonaqueous electrolyte secondary battery 10 includes a flat wound electrode body in which a positive electrode plate (not shown) and a negative electrode plate (not shown) are wound via a separator (not shown). 11 is accommodated in a rectangular battery outer can 12 and the battery outer can 12 is sealed with a sealing plate 13.

この偏平状の巻回電極体１１は、巻回軸方向の両端部に正極合剤、負極合剤を塗布しない正極芯体露出部１４、負極芯体露出部１５を備えている。正極芯体露出部１４は正極集電体１６を介して正極端子１７に接続され、負極芯体露出部１５は負極集電体１８１を介して負極端子１９に接続されている。正極端子１７、負極端子１９はそれぞれ絶縁部材２０、２１を介して封口板１３に固定されている。 The flat wound electrode body 11 includes a positive electrode core exposed portion 14 and a negative electrode core exposed portion 15 that do not apply a positive electrode mixture and a negative electrode mixture to both ends in the winding axis direction. Positive electrode substrate exposed portion 14 is connected via a positive electrode collector 16 to positive terminal 17, negative electrode substrate exposed portion 15 is connected to the negative terminal 19 via a negative electrode collector 18 1. The positive terminal 17 and the negative terminal 19 are fixed to the sealing plate 13 via insulating members 20 and 21, respectively.

この角形の非水電解質二次電池は、偏平状の巻回電極体１１を電池外装缶１２内に挿入した後、封口板１３を電池外装缶１２の開口部にレーザ溶接し、その後電解液注液孔（図示せず）から非水電解液を注液して、この電解液注液孔を密閉することにより作製される。なお、電解液としては、例えばエチレンカーボネートとジエチルカーボネートを体積比で３：７となるように混合した溶媒に対し、ＬｉＰＦ６を１モル／Ｌとなるように溶解した非水電解液を使用し得る。 In this rectangular nonaqueous electrolyte secondary battery, after the flat wound electrode body 11 is inserted into the battery outer can 12, the sealing plate 13 is laser welded to the opening of the battery outer can 12, and then an electrolyte solution is injected. It is produced by injecting a non-aqueous electrolyte from a liquid hole (not shown) and sealing the electrolyte injection hole. As the electrolytic solution, for example, a non-aqueous electrolytic solution in which LiPF 6 is dissolved at 1 mol / L in a solvent in which ethylene carbonate and diethyl carbonate are mixed at a volume ratio of 3: 7 is used. obtain.

次に、実施例に係る偏平状の巻回電極体１１の具体的製造方法について説明する。
［正極板の作製］
正極板は次のようにして作製した。まず、正極活物質としてのコバルト酸リチウム（ＬｉＣｏＯ２）粉末９４質量％と、導電剤としてのアセチレンブラックあるいはグラファイト等の炭素系粉末３質量％と、ポリビニリデンフルオライド（ＰＶｄＦ）よりなる結着剤３質量％とを混合し、得られた混合物にＮ−メチル−２−ピロリドン（ＮＭＰ）からなる有機溶剤を加えて混練して正極活物質合剤スラリーを調製した。次いで、アルミニウム箔（例えば、厚さが２０μｍのもの）からなる正極芯体を用意し、上述のようにして作製した正極活物質合剤スラリーを正極芯体の両面に、均一に塗布して正極活物質合剤層を塗布した。この際、正極活物質合剤層の一方側には、正極活物質合剤スラリーの塗布されていない所定幅（ここでは１２ｍｍとした）の非塗布部（正極芯体露出部）が正極芯体の端縁
に沿って形成されるように塗布した。この後、正極活物質合剤層を形成した正極芯体を乾燥機中を通過させて、スラリー作製時に必要であったＮＭＰを除去して乾燥させた。乾燥後に、ロールプレス機により厚さが０．０６ｍｍとなるまで圧延して正極板を作製した。このようにして作製した正極板を幅が１００ｍｍとなる短冊状に切り出し、幅が１０ｍｍの帯状のアルミニウムからなる正極芯体露出部を設けた正極板を得た。 Next, a specific method for manufacturing the flat wound electrode body 11 according to the embodiment will be described.
[Production of positive electrode plate]
The positive electrode plate was produced as follows. First, a binder comprising 94% by mass of lithium cobaltate (LiCoO 2 ) powder as a positive electrode active material, 3% by mass of carbon-based powder such as acetylene black or graphite as a conductive agent, and polyvinylidene fluoride (PVdF). 3% by mass was mixed, and an organic solvent composed of N-methyl-2-pyrrolidone (NMP) was added to the obtained mixture and kneaded to prepare a positive electrode active material mixture slurry. Next, a positive electrode core body made of aluminum foil (for example, having a thickness of 20 μm) is prepared, and the positive electrode active material mixture slurry prepared as described above is uniformly applied to both surfaces of the positive electrode core body. An active material mixture layer was applied. At this time, on one side of the positive electrode active material mixture layer, a non-coated portion (positive electrode exposed portion) having a predetermined width (12 mm in this case) where the positive electrode active material mixture slurry is not applied is a positive electrode core body. It was apply | coated so that it might form along the edge of this. Thereafter, the positive electrode core body on which the positive electrode active material mixture layer was formed was passed through a drier to remove NMP necessary for slurry preparation and dry. After drying, a positive electrode plate was produced by rolling with a roll press machine until the thickness became 0.06 mm. The positive electrode plate thus produced was cut into a strip shape having a width of 100 mm to obtain a positive electrode plate provided with a positive electrode core exposed portion made of strip-shaped aluminum having a width of 10 mm.

［負極板の作製］
負極板は次のようにして作製した。まず、負極活物質としての天然黒鉛粉末９８質量％と、結着剤としてのカルボキシメチルセルロース（ＣＭＣ）及びスチレン−ブタジエンゴム（ＳＢＲ）をそれぞれ１質量％ずつ混合し、水を加えて混練して負極活物質合剤スラリーを調製した。次いで、銅箔（例えば、厚さが１２μｍのもの）からなる負極芯体を用意し、上述のようにして作製した負極活物質合剤スラリーを負極芯体の両面に均一に塗布して、負極活物質合剤層を形成した。この場合、負極活物質合剤層の一方の側には、負極活物質合剤スラリーの塗布されていない所定幅（ここでは１０ｍｍとした）の非塗布部（負極芯体露出部）が負極芯体の端縁に沿って形成されるように塗布した。この後、負極活物質合剤層を形成した負極芯体を乾燥機中を通過させて乾燥させた。乾燥後に、ロールプレス機により厚さが０．０５ｍｍとなるまで圧延して負極板を作製した。このようにして作製した負極板を幅が１１０ｍｍとなる短冊状に切り出し、幅が８ｍｍの帯状の負極芯体露出部を設けた負極板を得た。 [Production of negative electrode plate]
The negative electrode plate was produced as follows. First, 98% by mass of natural graphite powder as a negative electrode active material and 1% by mass of carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) as a binder are mixed, and water is added to knead to prepare a negative electrode. An active material mixture slurry was prepared. Next, a negative electrode core made of copper foil (for example, having a thickness of 12 μm) is prepared, and the negative electrode active material mixture slurry prepared as described above is uniformly applied to both surfaces of the negative electrode core to form a negative electrode An active material mixture layer was formed. In this case, on one side of the negative electrode active material mixture layer, a non-coated portion (negative electrode core exposed portion) having a predetermined width (here, 10 mm) where the negative electrode active material mixture slurry is not applied is a negative electrode core. It was applied to form along the edge of the body. Thereafter, the negative electrode core body on which the negative electrode active material mixture layer was formed was passed through a dryer and dried. After drying, it was rolled by a roll press machine until the thickness became 0.05 mm to produce a negative electrode plate. The negative electrode plate thus produced was cut into a strip shape having a width of 110 mm to obtain a negative electrode plate provided with a strip-shaped negative electrode core exposed portion having a width of 8 mm.

［巻き取り電極体の作製］
上述のようにして得られた正極板の正極芯体露出部と負極板の負極芯体露出部とがそれぞれ対向する電極の活物質合剤層と重ならないようにずらして、ポリエチレン製の多孔質セパレータ（厚さが０．０２２ｍｍで、幅が１００ｍｍのもの）を介して巻回し、両側にそれぞれ複数のアルミニウム箔からなる正極芯体露出部１４と、銅箔からなる負極芯体露出部１５が形成された実施例で使用する偏平状の巻回電極体１１を作製した。 [Production of winding electrode body]
The porous body made of polyethylene is shifted so that the positive electrode core exposed part of the positive electrode plate obtained as described above and the negative electrode core exposed part of the negative electrode plate do not overlap the active material mixture layer of the opposing electrode, respectively. Winding through a separator (having a thickness of 0.022 mm and a width of 100 mm), a positive electrode core exposed portion 14 made of a plurality of aluminum foils and a negative electrode core exposed portion 15 made of a copper foil are respectively provided on both sides. The flat wound electrode body 11 used in the formed example was produced.

［集電体の抵抗溶接］
このようにして作製された偏平状の巻回電極体１１の正極芯体露出部１４にアルミニウム製の正極集電体１６及び正極集電体受け部品（図示せず）を抵抗溶接によって取り付け、同じく負極芯体露出部１５に銅製の負極集電体１８１及び負極集電体受け部品１８３を抵抗溶接によって取り付けるが、以下においては、負極芯体露出部１５に銅製の負極集電体１８１及び負極集電体受け部品１８３を抵抗溶接によって取り付ける場合について説明する。 [Resistance welding of current collector]
An aluminum positive electrode current collector 16 and a positive electrode current collector receiving part (not shown) are attached to the positive electrode core body exposed portion 14 of the flat wound electrode body 11 produced in this way by resistance welding. receiving the negative electrode collector 18 1 and the negative electrode current collector made of copper on the negative electrode substrate exposed portion 15 mounting the component 18 3 by resistance welding, but in the following, the negative electrode current collector made of copper on the negative electrode substrate exposed portion 15 18 1 and it will be described for attaching the negative electrode collector receiving part 18 3 by resistance welding.

実施例の角形非水電解質二次電池１０においては、負極集電体１８１として中央部にプロジェクションとして作用する突起（高さｈ＝０．８ｍｍ、基部の直径Ｗ＝２ｍｍ）１８２が形成されたものを用いた。また、絶縁シール材としては、熱溶着性樹脂製テープ２３ａ（厚さＬ＝０．１ｍｍ）に中央部に開口２３１（直径Ａ＝６ｍｍの円状）を形成して用いた。なお、ここで使用した熱溶着性樹脂製テープ２３ａはポリオレフィン系熱溶着性樹脂槽を含む多層フィルムからなるものである。 In prismatic nonaqueous electrolyte secondary battery 10 of the embodiment, the projection acting as a projection in the central portion as a negative electrode collector 18 1 (height h = 0.8 mm, the diameter W = 2 mm of the base) 18 2 is formed Used. As the insulating sealing material, an opening 23 1 (circular shape with a diameter A = 6 mm) was formed in the center of a heat-welding resin tape 23a (thickness L = 0.1 mm). The heat-welding resin tape 23a used here is a multilayer film including a polyolefin-based heat-welding resin tank.

まず、銅製の負極芯体露出部１５を束ね、その上下に、それぞれ熱溶着性樹脂製テープ２３ａに形成された開口２３１の中心が一致するように、熱溶着性樹脂製テープ２３ａを載置し、その下側から銅製の負極集電体１８１の突起１８２が下側の熱溶着性樹脂製テープ２３ａの開口２３１の中心に一致するように配置し、同じく上側の熱溶着性樹脂製テープ２３ａの開口２３１を塞ぐように負極集電体受け部品１８３を配置した。次いで、負極集電体１８１及び負極集電体受け部品１８３を挟むように上下から抵抗溶接装置（図示せず）の銅製の電極棒２４１及び２４２を当接し、両方の電極棒２４１及び２４２を互いに
押圧してわずかに短絡した状態としてから、両電極棒２４１及び２４２の間に短時間予め実験的に定めた最適溶接電流（例えば４ｋＡ）を流して抵抗溶接を行った。 First, bundled copper negative electrode substrate exposed section 15, placed above and below, so that each center of the heat-fusible resin tape 23a in the formed opening 23 1 is coincident, the thermal adhesiveness resin tape 23a The protrusion 18 2 of the copper negative electrode current collector 18 1 is arranged so as to coincide with the center of the opening 23 1 of the lower heat-welding resin tape 23a from the lower side, and the upper heat-welding resin is also formed. the negative electrode collector receiving part 18 3 so as to close the opening 23 1 of manufacturing tape 23a was placed. Then, the negative electrode collector 18 1 and the negative electrode collector receiving part 18 3 resistance welding system from above and below so as to sandwich the (not shown) copper of the electrode rod 24 1 and 24 2 the contact of both of the electrode rod 24 1 and 24 2 are pressed against each other to be slightly short-circuited, and then resistance welding is performed by passing an optimum welding current (for example, 4 kA) predetermined experimentally between the electrode rods 24 1 and 24 2 for a short time. It was.

この上下の銅製の負極集電体１８１及び負極集電体受け部品１８３を引っ張り試験機によって剥離するまでの強度を測定したところ、１９．６Ｎ（２０ｋｇｆ）であった。また、この剥離面の拡大写真は図４に示したとおりである。図４から明らかなように、抵抗溶接によりスパッタされた銅のチリ２５が熱溶着性樹脂製テープ２３ａ内に捕獲されていることが認められる。 The measured intensity until detached by the upper and lower copper anode current collector 18 1 and the negative electrode collector receiving part 18 3 to a tensile tester was 19.6 N (20 kgf). Moreover, the enlarged photograph of this peeling surface is as having shown in FIG. As is apparent from FIG. 4, it is recognized that copper dust 25 sputtered by resistance welding is captured in the heat-welding resin tape 23a.

なお、熱溶着性樹脂製テープ２３ａとしては、熱溶着性樹脂の溶着温度が７０〜１５０℃程度であり、溶解温度は２００℃以上のものであれば適宜に選択して使用し得るが、更に非水電解質等に対する耐薬品性を備えているものが望ましい。熱溶着性樹脂としては、ゴム系シール材、酸変性ポリプロピレン、ポリオレフィン系熱溶着性樹脂等を使用し得る。   The heat-welding resin tape 23a can be appropriately selected and used as long as the heat-welding resin has a welding temperature of about 70 to 150 ° C. and the melting temperature is 200 ° C. or higher. Those having chemical resistance against non-aqueous electrolytes are desirable. As the heat-welding resin, rubber-based sealing materials, acid-modified polypropylene, polyolefin-based heat-welding resins, and the like can be used.

また、熱溶着性樹脂製テープ２３ａの厚さＬは、突起１８２の高さｈの０．１〜１倍とであることが好ましい。熱溶着性樹脂製テープ２３ａの厚さＬが突起１８２の高さｈの０．１倍未満であると実質的に熱溶着性樹脂製テープ２３ａがない場合と同様になり、スパッタチリが外部へ飛散するのを抑止することができなくなるために内部短絡が増加する。また、熱溶着性樹脂製テープ２３ａの厚さＬが突起１８２の高さｈの１倍を超えると、突起１８２を負極芯体の露出部１５と直接接触させるためには、過剰の圧力が必要となるため好ましくない。 The thickness L of the heat-fusible resin tape 23a is preferably in between 0.1 to 1 times the height h of the projection 18 2. The thickness L of the heat-fusible resin tape 23a becomes as if there were no substantial thermal adhesiveness resin tape 23a is less than 0.1 times the height h of the projection 18 2, Supattachiri is outside Since it becomes impossible to suppress scattering, internal short circuit increases. If the thickness L of the heat-fusible resin tape 23a is more than 1 times the height h of the projection 18 2, for contacting the projection 18 2 directly exposed portions 15 of the negative electrode substrate is excess pressure Is not preferable because it is necessary.

また、熱溶着性樹脂製テープ２３ａの中央部の開口２３１の幅Ａは前記突起１８２の幅Ｗの１〜５倍であることが好ましい。熱溶着性樹脂製テープ２３ａの中央の開口２３１の幅Ｗが突起１８２の幅Ｗの１倍未満であると、熱溶着性樹脂製テープ２３ａが突起１８２の先端部を部分的に覆うことがあるため、抵抗溶接時に溶接部に熱溶着性樹脂製テープ２３ａが残留しやすくなり、爆発的に燃焼を起こしたり、溶接部の強度の低下及び信頼性の低下が生じる。また、熱溶着性樹脂製テープ２３ａの中央部の開口２３１の幅Ａが突起１８２の幅Ｗの５倍を超えると、実質的に熱溶着性樹脂製テープ２３ａがない場合と同様になり、スパッタチリが外部へ飛散するのを抑止することができなくなるために内部短絡が増加する。 Further, it is preferable that the width A of the opening 23 1 in the central portion of the heat-fusible resin tape 23a is 1 to 5 times the width W of the projection 18 2. When the central opening 23 1 in the width W of the heat-fusible resin tape 23a is less than 1 times the width W of the projection 18 2, the heat-fusible resin tape 23a is partially cover the distal end portion of the projection 18 2 As a result, the heat-weldable resin tape 23a tends to remain in the weld during resistance welding, causing explosive combustion, and reducing the strength and reliability of the weld. Further, if the width A of the opening 23 1 in the central portion of the heat-fusible resin tape 23a is greater than 5 times the width W of the projection 18 2, it becomes substantially the same manner as if no thermal adhesiveness resin tape 23a is Since it becomes impossible to suppress spatter dust from being scattered to the outside, the internal short circuit is increased.

［変更例１］
実施例で使用した熱溶着性樹脂製テープを使用しない以外は実施例の場合と同様にして抵抗溶接を行った。なお、変更例１の場合の予め実験的に定めた最適溶接電流は５．７ｋＡである。この抵抗溶接後の巻回電極体１１側の銅製の負極芯体露出部１５の間には僅かにスパッタされた銅のチリの存在が認められた。また、抵抗溶接後の変更例１の上下の集電体を引っ張り試験機によって剥離するまでの強度を測定したところ、１９．６Ｎ（２０ｋｇｆ）であった。 [Modification 1]
Resistance welding was performed in the same manner as in the example except that the heat-welding resin tape used in the example was not used. Note that the optimum welding current experimentally determined in the case of the first modification is 5.7 kA. Slightly sputtered copper dust was observed between the copper negative electrode core exposed portions 15 on the side of the wound electrode body 11 after resistance welding. Moreover, it was 19.6 N (20 kgf) when the intensity | strength until the upper and lower collectors of the modified example 1 after resistance welding were peeled with the tension tester was measured.

なお、実施例及び変更例１の実験状態及び測定結果を纏めると、下記表１に示したとおりとなる。

In addition, it is as having shown in the following Table 1 when the experimental state and measurement result of an Example and the modification 1 are put together.

表１の記載から明らかなように、実施例の場合の最適抵抗溶接電流値は変更例１の場合の約７０％となっているが、引っ張り試験結果は同等となっている。このような結果が得られた理由は、実施例では抵抗溶接時に電流が流れる範囲が熱溶着性樹脂製テープ２３ａの開口２３１によって狭い範囲に制限されているのに対し、変更例１では上下の集電体及び集電体受け部品が銅製の負極芯体露出部と接触する面積が広いため、抵抗溶接に直接関連しない無効電流が大きくなったためと推測される。 As is clear from the description in Table 1, the optimum resistance welding current value in the case of the example is about 70% in the case of the modified example 1, but the tensile test result is the same. The reason for this result may be because, while the range in which current flows during the resistance welding in the embodiment is limited to a narrow range by the opening 23 1 of the heat-fusible resin tape 23a, vertical in Modification 1 This is probably because the reactive current that is not directly related to resistance welding has increased because the current collector and the current collector receiving part have a large area in contact with the negative electrode core exposed portion made of copper.

したがって、抵抗溶接する部分の周囲に熱溶着性樹脂製テープ２３ａが存在する状態で抵抗溶接すると、スパッタされた金属のチリが熱溶着性樹脂製テープ２３ａの内部に捕獲されるため、スパッタされた金属のチリが外部に飛散することが少なくなることが理解できる。   Therefore, when resistance welding is performed in a state where the heat-welding resin tape 23a exists around the portion to be resistance-welded, sputtered metal dust is captured inside the heat-welding resin tape 23a, and thus sputtered. It can be understood that metal dust is less scattered to the outside.

なお、上記実施例では負極芯体露出部１５、負極集電体１８１及び負極集電体受け部品１８３ともに銅製の場合について説明したが、銅は電極の芯体として常用されている金属の内、最も熱伝導率が高い金属であるため、他の金属の場合に本発明を適用するとよりスパッタされた金属のチリが外部に飛散することが少なくなる。したがって、本発明によれば、密閉電池の種類によらず、内部短絡の発生が少なく、信頼性の高い密閉電池が得られることが分かる。 Incidentally, the metal negative electrode substrate exposed portion 15 in the above embodiment, the description has been given of the both the anode current collector 18 1 and the negative electrode collector receiving part 18 3 copper, copper that are commonly used as the core of the electrode Among them, since the metal has the highest thermal conductivity, when the present invention is applied to other metals, the spattered metal dust is less likely to be scattered outside. Therefore, according to the present invention, it can be seen that a highly reliable sealed battery with few internal short-circuits can be obtained regardless of the type of sealed battery.

［変更例２］
実施例の角形非水電解質二次電池１０においては、図２及び図３に示したように、負極集電体１８１として中央部に突起１８２が形成されたものを用い、熱溶着性樹脂製テープ２３ａに中央部に開口２３１を形成して用いて抵抗溶接した例を示した。しかしながら、特に連続的に抵抗溶接を続けると、電極棒２４１及び２４２が熱くなっているため、抵抗溶接時に電流を流す前に熱溶着性樹脂製テープ２３ａ自体が軟化することがある。このような状態で抵抗溶接を行うと、抵抗溶接時には負極集電体１８１及び負極集電体受け部品１８３を両側から電極棒２４１及び２４２によって互いに押圧しながら抵抗溶接が行われるため、図５に示したように熱溶着性樹脂製テープ２３ａ自体が溶接部側へはみ出してしまうことがある。この状態で抵抗溶接用電流を流すと場合によっては熱溶着性樹脂が爆発的に燃焼してしまう。 [Modification 2]
In prismatic nonaqueous electrolyte secondary battery 10 of the embodiment, as shown in FIGS. 2 and 3, with those projections 18 2 is formed in the central portion as a negative electrode collector 18 1, thermal welding resin It shows an example of resistance welding using the manufactured tape 23a to form an opening 23 1 in the center. However, especially when resistance welding is continued continuously, the electrode rods 24 1 and 24 2 are heated, and thus the heat-welding resin tape 23a itself may be softened before a current is passed during resistance welding. Doing resistance welding in such a state, the resistance welding is performed while pressing each other at the time of resistance welding the negative electrode collector 18 1 and the negative electrode collector receiving part 18 3 from both sides by electrode rods 24 1 and 24 2 As shown in FIG. 5, the heat-weldable resin tape 23a itself may protrude to the welded portion side. If a resistance welding current is passed in this state, the heat-welding resin may explode in some cases.

そこで、実施例を変更した変更例２の角形電池の抵抗溶接部として、図６及び図７に示したように、負極集電体受け部品１８３の負極集電体１８１の突起１８２に対向する側に、突起１８２に向かって高さＨの表面が平坦な凸部１８４を形成し、この表面が平坦な凸部１８４の表面にまで軟化した熱溶着性樹脂製テープ２３ａがはみ出てこないようにすることによって、抵抗溶接時の熱溶着性樹脂製テープ２３ａの爆発的な燃焼を抑止するようにした。なお、図６及び図７においては図２及び図３に示した構成と同一の部分には同一の参照符号を付与してその詳細な説明は省略する。 Therefore, the resistance welds prismatic battery of the second modification which changed the embodiment, as shown in FIGS. 6 and 7, the projection 18 2 of the negative electrode collector 18 1 of the negative electrode current collector receiving part 18 3 on opposite sides, projections 18 2 toward the surface of the height H to form a flat convex portion 18 4, the heat-fusible resin tape 23a softened to the this surface flat surfaces of the projections 18 4 By preventing it from protruding, explosive combustion of the heat-welding resin tape 23a during resistance welding was suppressed. 6 and 7, the same reference numerals are given to the same parts as those shown in FIGS. 2 and 3, and the detailed description thereof is omitted.

この場合、熱溶着性樹脂製テープ２３ａの厚さをＬとすると、表面が平坦な凸部１８４の高さＨは、Ｌ≦Ｈ＜（３／２）Ｌとすることが好ましい。すなわち、表面が平坦な凸部１８４の高さＨを、熱溶着性樹脂製テープ２３ａの厚さＬと同じかそれよりも高くし、表面が平坦な凸部１８４の表面を熱溶着性樹脂製テープ２３ａよりも突き出させるようにすると、軟化した熱溶着性樹脂製テープ２３ａが表面が平坦な凸部１８４の表面にまではみ出るようなことがなくなる。また、表面が平坦な凸部１８４の高さＨが熱溶着性樹脂製テープ２３ａの厚さＬの（３／２）未満であると、熱溶着性樹脂製テープ２３ａによる抵抗溶接時のスパッタされたチリの捕集効果が良好となる。なお、プロジェクションとして作用する突起１８２の高さｈと熱溶着性樹脂製テープ２３ａの厚さＬとの間の関係及び突起
１８２の基部の幅Ｗと熱溶着性樹脂製テープ２３ａの中央の開口２３１の幅Ａとの間の関係は、実施例において示したものと同様に設定すればよい。 In this case, when the thickness of the heat-fusible resin tape 23a is L, the height H of the surface flat protrusions 18 4, it is preferable that the L ≦ H <(3/2) L . That is, the height H of the surface flat protrusions 18 4, equal to or higher than the thickness L of the heat-fusible resin tape 23a, the surface of the heat-fusible surface of a flat convex portion 18 4 If so also protrude from the resin tape 23a, softened thermally fusible resin tape 23a is the surface that is eliminated as protrude to the surface of a flat convex portion 18 4. Further, when the surface height H of the flat convex portion 18 4 is less than (3/2) of the thickness L of the heat-fusible resin tape 23a, sputtering during resistance welding by thermal adhesiveness resin tape 23a The collected effect of dust is improved. Incidentally, the central projection 18 2 of height h and the heat-fusible resin width W of the relationship and the protrusion 18 2 of the base between the thickness L of the tape 23a and the heat-fusible resin tape 23a which acts as a projection relationship between the width a of the opening 23 1 may be set in the same manner as shown in the examples.

なお、表面が平坦な凸部１８４の形状は平面視で円形状とすると、作製し易く、また熱溶着性樹脂製テープ２３ａの開口２３１との間の位置決めを行いやすくなる。この表面が平坦な凸部１８４の径をＤとし、突起１８２の基部の径をＷとし、熱溶着性樹脂製テープ２３ａの開口２３１の径をＡとした場合、Ｗ＜Ｄ＜Ａとすることが好ましい。この場合の表面が平坦な凸部１８４、突起１８２及び熱溶着性樹脂製テープ２３ａの開口２３１の平面視における配置関係は、図７に示したとおりとなる。 The shape of the surface flat protrusions 18 4 When a circular shape in plan view, easy to prepare, also tends to perform positioning between the opening 23 1 of the heat-fusible resin tape 23a. This surface diameter of flat protrusions 18 4 is D, if the diameter of the base of the projection 18 2 is W, the diameter of the opening 23 1 of the heat-fusible resin tape 23a was A, W <D <A It is preferable that In this case, the arrangement relationship in plan view of the projections 18 4 , the projections 18 2, and the openings 23 1 of the heat-welding resin tape 23a with flat surfaces is as shown in FIG.

このように、変更例２の角形電池の抵抗溶接部の構成を採用すると、抵抗溶接時に熱溶着性樹脂が突起１８２と表面が平坦な凸部１８４との間に入り込むことがなくなるので、熱溶着性樹脂が爆発的に燃焼することを抑止することができる。 Thus, when employing the configuration of the resistance welding of the prismatic battery of the second modification, the heat-fusible resin projections 18 2 and the surface during the resistance welding is eliminated that enters between the flat convex portion 18 4, It is possible to prevent the heat welding resin from burning explosively.

［変更例３］
実施例及び変更例２では、絶縁シール材として熱溶着性樹脂製テープ２３ａを用いた例を示したが、糊材付き絶縁テープも使用可能である。絶縁シール材としてこの糊材付き絶縁テープ２３ｂを使用し実施例を変更した変更例３の角形電池の抵抗溶接部の構成を図８〜図１０を用いて説明する。なお、図８〜図１０においては図６及び図７に示した構成と同一の部分には同一の参照符号を付与してその詳細な説明は省略する。 [Modification 3]
In the example and the modified example 2, the example in which the heat-welding resin tape 23a is used as the insulating sealing material is shown, but an insulating tape with a paste material can also be used. The structure of the resistance welding part of the square battery of the modification 3 which changed the Example using this insulating tape 23b with a paste material as an insulating sealing material is demonstrated using FIGS. 8-10. 8 to 10, the same parts as those shown in FIGS. 6 and 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

変更例３の抵抗溶接部が変更例２の抵抗溶接部と構成が相違している点は、変更例２では絶縁シール材として熱溶着性樹脂製テープ２３ａを用いているのに対し、変更例３では糊材付き絶縁テープ２３ｂを用いた点でのみであり、その他の構成は実質的に同一である。この糊材付き絶縁テープ２３ｂとしては、ポリイミドテープ、ポリプロピレンテープ、ポリフェニレンサルファイドテープ等からなる絶縁テープ２３ｃの一面に糊材２３ｄが塗布されているものを使用し得る。ここでは、この糊材付き絶縁テープ２３ｂの総厚さｔ＝０．１ｍｍ、糊材２３ｄの厚さａ＝０．０３ｍｍとし、表面が平らな凸部の高さＨ＝０．１０ｍｍのものを使用したが、表面が平らな凸部の高さＨをａ＜Ｈ＜（３／２）ｔの関係を満たすように設定することが好ましい。すなわち、糊材２３ｄは軟質であるために変形し易いため、抵抗溶接時に電極棒２４１及び２４２で圧力をかけた際に絶縁テープ２３ｃからはみ出し易い。しかしながら、ａ＜Ｈの関係にあると、糊材２３ｄの厚さａは表面が平らな凸部１８４の高さＨよりも低いため、抵抗溶接時に糊材が表面が平らな凸部を覆うことがなくなる。また、Ｈ＜（３／２）ｔの関係にあると、抵抗溶接時のスパッタされたチリの捕集効果が良好となる。 The difference between the resistance welded portion of the modified example 3 and the resistance welded portion of the modified example 2 is that the modified example 2 uses the heat-weldable resin tape 23a as the insulating seal material, but the modified example No. 3 is only in that the insulating tape 23b with glue material is used, and other configurations are substantially the same. As the insulating tape 23b with glue material, one having a glue material 23d coated on one surface of an insulating tape 23c made of polyimide tape, polypropylene tape, polyphenylene sulfide tape or the like can be used. Here, the total thickness t of this insulating tape 23b with glue material is set to 0.1 mm, the thickness a of the glue material 23d is set to 0.03 mm, and the height H of the convex portion having a flat surface is H = 0.10 mm. Although used, it is preferable to set the height H of the convex portion having a flat surface so as to satisfy the relationship of a <H <(3/2) t. That glue material 23d is liable to be deformed because it is soft, easily protrude from the insulating tape 23c when pressured by the electrode rod 24 1 and 24 2 at the time of resistance welding. However, when the relation of a <H, the thickness a of the glue material 23d has low than the height H of the flat convex portion 18 4 surface, glue material surface covers the flat convex portion during resistance welding Nothing will happen. Moreover, when it is in the relationship of H <(3/2) t, the collection effect of the sputtered dust at the time of resistance welding will become favorable.

なお、プロジェクションとして作用する突起１８２の高さｈと糊材付き絶縁テープ２３ｂの総厚さｔとの間の関係及び突起１８２の基部の幅Ｗと糊材付き絶縁テープ２３ｂの中央の開口２３１の幅Ａとの間の関係は、実施例において示したものと同様に、糊材付き絶縁テープ２３ｂの総厚さｔは、突起１８２の高さｈの０．１〜１倍とであることが好ましく、また、糊材付き絶縁テープ２３ｂの中央部の開口２３１の幅Ａは前記突起１８２の幅Ｗの１〜５倍であることが好ましい。 Incidentally, the central aperture of the projection 18 2 of height h and paste material with insulation width W of the relationship and the protrusion 18 2 of the base between the total thickness t of the tape 23b and adhesive material-attached insulating tape 23b which acts as a projection relationship between the 23 first width a, similar to those shown in the examples, the total thickness t of the adhesive material-attached insulating tape 23b comprises a 0.1 to 1 times the height h of the projection 18 2 is preferably, also, it is preferable that the width a of the opening 23 1 in the central portion of the adhesive material-attached insulating tape 23b 1 to 5 times the width W of the projection 18 2.

また、変更例３の角型電池の抵抗溶接部としては、変更例２の抵抗溶接部の場合と同様に、負極集電体受け部品１８３の負極集電体１８１の突起１８２に対向する側に突起１８２に向かって高さＨの表面が平坦な凸部１８４を有するものを用いた例を示したが、この表面が平坦な凸部１８４は必ずしも必要な構成ではない。しかしながら、糊材付き絶縁テープ２３ｂを用いた場合に表面が平坦な凸部１８４が形成されていないと、図１０に示したように、抵抗溶接時に電極棒２４１及び２４２で圧力をかけた際に糊材２３ｄが絶縁テープ２３ｃから抵抗溶接部側にはみ出し易い。そのため、安全性を確保するためには表面
が平坦な凸部１８４を設けた方がよい。 The counter as a resistance welding portion of the square cell of Modification 3, as in the case of the resistance welding of the second modification, the projections 18 2 of the negative electrode collector 18 1 of the negative electrode current collector receiving part 18 3 the height H surface toward the projection 18 2 on the side is an example of using a material having a flat convex portion 18 4, but 4 this surface flat protrusion 18 is not always required configuration. However, if the surface in the case of using the adhesive material-attached insulating tape 23b is not formed flat protrusions 18 4, as shown in FIG. 10, applying pressure during resistance welding electrode rods 24 1 and 24 2 When this occurs, the glue material 23d tends to protrude from the insulating tape 23c to the resistance welded portion side. Therefore, in order to ensure the safety better surface provided with a flat protrusion 18 4.

上述した実施例及び変更例２、３において、プロジェクションとして設けた負極集電体１８１の突起１８２は先端部の断面積が根本の断面積よりも小さくなった形状であるが、プロジェクションの形状はこれに限定されない。また、上述した変更例２及び変更例３においては、負極集電体受け部品１８３の負極集電体１８１の突起１８２に対向する側に突起１８２に向かって高さＨの表面が平坦な凸部１８４を有するものを用いた例を示したが、負極集電体１８１及び負極集電体受け部品１８３の両方に、プロジェクションを設けた場合も変更例２及び変更例３と同様の効果が得られる。 In the above-described embodiment and modification examples 2 and 3, the projection 18 2 of the negative electrode current collector 18 1 provided as a projection has a shape in which the cross-sectional area of the tip is smaller than the cross-sectional area of the root. Is not limited to this. In the second modification and variations 3 described above, the negative electrode collector receiving part 18 3 of the negative electrode collector 18 1 of the protrusion 18 height H surface toward the projection 18 2 to 2 side opposing the Although an example of using a material having a flat convex portion 18 4, both of the negative electrode collector 18 1 and the negative electrode collector receiving part 18 3, also changes the case of providing the projection example 2 and modification 3 The same effect can be obtained.

上述した実施例及び変更例２、３においては、角形外装缶を用いた例について説明したが、外装缶形状は特に限定されず、円筒形の外装缶を用いても適用可能である。しかしながら、電池を組み込む機器のスペース効率を考慮すると、角形形状の外装缶を用いることが好ましい。また、上述した実施例及び変更例２、３においては、偏平状の巻回電極体を用いる例について説明したが、例えば、平板状の正・負極板をセパレータを介して積層した電極体などを適用できることは明らかである。   In the above-described Examples and Modifications 2 and 3, the example using the rectangular outer can is described, but the shape of the outer can is not particularly limited, and the present invention can also be applied using a cylindrical outer can. However, in consideration of the space efficiency of the device in which the battery is incorporated, it is preferable to use a rectangular outer can. Moreover, in the above-mentioned Example and the modification examples 2 and 3, although the example using a flat wound electrode body was demonstrated, the electrode body etc. which laminated | stacked the plate-shaped positive / negative electrode through the separator were mentioned, for example. It is clear that it can be applied.

負極電極体１８１及び負極芯体露出部１５の構成の詳細について、さらに説明する。図２に示したように、負極集電体１８１は、負極芯体露出部１５と抵抗溶接により接続される第１領域を備えている。この第１領域の端部のうち偏平状の巻回電極体１１の巻回軸方向に対してこの巻回電極体１１の中央側（図２において左側）には折れ曲がり部が形成されている。また、本実施形態においては、第１領域の反対側の端部（図２において右側）にも折れ曲がり部が形成されている。 Details of the structure of an anode electrode body 18 1 and the negative electrode substrate exposed portion 15 will be further described. As shown in FIG. 2, the negative electrode collector 18 1 includes a first region connected by resistance welding and the negative electrode substrate exposed portion 15. A bent portion is formed on the center side (left side in FIG. 2) of the winding electrode body 11 with respect to the winding axis direction of the flat winding electrode body 11 in the end portion of the first region. In the present embodiment, a bent portion is also formed at the end portion on the opposite side of the first region (the right side in FIG. 2).

図１Ａ及び図１Ｂに示したように、負極集電体１８１は、第１領域と、第２領域と、第３領域と、第４領域とを有する。 As shown in FIGS. 1A and 1B, the anode current collector 18 1 has a first region, a second region, a third region and a fourth region.

第１領域は、この負極集電体１８１の一端側（負極芯体露出部１５側）に位置する板状の領域である。 The first region is a plate-like region located on the anode current collector 18 1 at one end (negative electrode substrate exposed portion 15 side).

第２領域は、第１領域と反対の端部側（負極端子１９側）に位置し、偏平状の巻回電極体１１の巻回軸方向（図１Ａにおいて左右方向）に延びる領域である。第２領域は、封口板１３と平行になるように配置されている。   The second region is a region that is located on the opposite end side (negative electrode terminal 19 side) from the first region and extends in the winding axis direction (left and right direction in FIG. 1A) of the flat wound electrode body 11. The second region is arranged so as to be parallel to the sealing plate 13.

第３領域は、第２領域から偏平状の巻回電極体１１の長径方向に延びる領域である。第３領域は、電池外装缶１２の側壁のうち偏平状の巻回電極体１１の巻回軸と平行なものに対して第１領域よりも近くに位置し、この側壁と平行となるように配置されている。第３領域は、第１領域と第２領域との間で、第１領域と同一平面上とならない位置にある。第４領域は、第１領域と第３領域とを繋ぐ領域である。   The third region is a region extending in the major axis direction of the flat wound electrode body 11 from the second region. The third region is located closer to the first region with respect to the side wall of the battery outer can 12 that is parallel to the winding axis of the flat wound electrode body 11, and is parallel to the side wall. Has been placed. The third region is at a position that is not on the same plane as the first region between the first region and the second region. The fourth region is a region connecting the first region and the third region.

図１Ｂに示したように、負極芯体露出部１５は、偏平の短径方向（図１Ｂにおいて左右方向）の幅が狭くなるように束ねられた幅狭部と、偏平の長径方向（図１Ｂにおいて上下方向）に対してこの幅狭部の両側に形成され幅狭部よりも幅が広い幅広部とを有する。負極芯体露出部１５は、幅狭部において負極集電体１８１の第１領域と抵抗溶接されている。 As shown in FIG. 1B, the negative electrode core exposed portion 15 includes a narrow portion bundled so that a width in a flat minor axis direction (left and right direction in FIG. 1B) is narrowed, and a flat major axis direction (FIG. 1B). And a wide portion formed on both sides of the narrow portion and wider than the narrow portion. Negative electrode substrate exposed portion 15 is resistance-welded to the negative electrode current collector 18 of the first region in the narrow section.

負極側を用いて説明した上述の構成を正極側にも適用するようにしてもよいし、負極側及び正極側いずれか一方に適用するようにしてもよいことは明らかである。例えば、上述した負極集電体１８１の構成を正極集電体１６に適用するようにしてもよいし、いずれか一方に適用するようにしてもよい。また、上述した負極芯体露出部１５の構成を正極芯体
露出部１４に適用するようにしてもよいし、いずれか一方に適用するようにしてもよい。 It is obvious that the above-described configuration described using the negative electrode side may be applied to the positive electrode side, or may be applied to either the negative electrode side or the positive electrode side. For example, it may be applied to structures of the anode current collector 18 1 described above to the positive electrode collector 16, may be applied to either one. Further, the configuration of the negative electrode core exposed portion 15 described above may be applied to the positive electrode core exposed portion 14 or may be applied to one of them.

以下、他の実施形態について説明する。他の実施形態に係る二次電池は、両端にそれぞれ正極芯体及び負極芯体が露出した密閉電池用の電極体と、少なくとも一方の前記芯体の両側に抵抗溶接された集電体を備える密閉電池において、前記抵抗溶接部分の周囲の前記芯体と集電体の間には絶縁シール材が配置されている。   Hereinafter, other embodiments will be described. A secondary battery according to another embodiment includes an electrode body for a sealed battery in which a positive electrode core and a negative electrode core are exposed at both ends, and a current collector that is resistance-welded on both sides of at least one of the core bodies. In the sealed battery, an insulating sealing material is disposed between the core body and the current collector around the resistance welding portion.

他の実施形態に係る二次電池は、両端にそれぞれ複数枚の正極芯体及び負極芯体が露出した密閉電池用の電極体と、少なくとも一方の前記複数枚の芯体の両側に抵抗溶接された集電体及び集電体受け部品を備えている。このような二次電池では、通常、電極体の積層数が多いので、確実に溶接させるためには多大な溶接エネルギーを与える必要があるため、抵抗溶接時にスパッタされたチリの発生が増加する。しかしながら、他の実施形態に係る二次電池においては、抵抗溶接部分の周囲の前記芯体と集電体及び集電体受け部品の間には絶縁シール材が配置されて・BR>「るので、抵抗溶接時に発生したチリは抵抗溶接部の周囲の絶縁シール材中に捕獲されるため、外部に飛散することがない。従って、内部短絡の発生が少なく、信頼性の高い密閉電池が得られる。また、抵抗溶接部分の周囲の芯体と集電体及び集電体受け部品の一方の間に絶縁シール材が配置された場合であっても、抵抗溶接時に発生したチリは抵抗溶接部の周囲の絶縁シール材中に捕獲されるため、電極体の内部ないし外部に飛散するチリを少なくする効果が得られる。   A secondary battery according to another embodiment is resistance-welded to both sides of an electrode body for a sealed battery in which a plurality of positive electrode core bodies and negative electrode core bodies are exposed at both ends, and at least one of the plurality of core bodies. Current collectors and current collector receiving parts. In such a secondary battery, since there are usually a large number of electrode bodies stacked, it is necessary to give a large amount of welding energy in order to ensure welding, so that the generation of dust sputtered during resistance welding increases. However, in the secondary battery according to another embodiment, an insulating sealant is disposed between the core around the resistance welded portion, the current collector, and the current collector receiving part. Since dust generated during resistance welding is trapped in the insulating sealing material around the resistance weld, it does not scatter to the outside, thus producing a highly reliable sealed battery with less occurrence of internal short circuit. In addition, even when an insulating sealing material is placed between the core around the resistance welded part and one of the current collector and the current collector receiving part, dust generated during resistance welding is not generated in the resistance welded part. Since it is captured in the surrounding insulating sealing material, the effect of reducing dust scattered inside or outside the electrode body can be obtained.

なお、他の実施形態に係る二次電池における芯体及び集電体は、両者とも同じ金属からなっていても、それぞれ異なる金属からなる場合であってもよく、また、正極芯体に対しても負極芯体に対しても等しく適用し得る。更に、他の実施形態に係る二次電池は、両端にそれぞれ正極芯体及び負極芯体が露出した密閉電池用の電極体と、少なくとも一方の前記芯体に対して両側から対向配置されているとともに抵抗溶接された集電体及び集電体受け部品を備えているものであれば、電極体が巻回形のものであっても積層形のものであってもよく、更に、非水電解質二次電池であっても水性電解質二次電池であってもよい。   Note that the core and the current collector in the secondary battery according to other embodiments may be made of the same metal or different metals, respectively, and Are equally applicable to the negative electrode core. Furthermore, the secondary battery according to another embodiment is disposed so as to be opposed to at least one of the core bodies from both sides with an electrode body for a sealed battery in which the positive electrode core body and the negative electrode core body are exposed at both ends, respectively. In addition, the electrode body may be a wound type or a laminated type as long as it has a resistance welded current collector and a current collector receiving part, and a non-aqueous electrolyte. It may be a secondary battery or an aqueous electrolyte secondary battery.

また、他の実施形態に係る二次電池においては、前記絶縁シール材は熱溶着性樹脂からなるテープ又は糊材付き絶縁テープであることが好ましい。   Moreover, in the secondary battery which concerns on other embodiment, it is preferable that the said insulating sealing material is a tape which consists of heat welding resin, or an insulating tape with a paste material.

係る態様の二次電池によれば、抵抗溶接時に発生するスパッタされた高温のチリは、固体の熱溶着性樹脂からなるテープ又は糊材付き絶縁テープを部分的に溶融することによって熱を奪われ、急速に冷却されて温度が下がるので、容易に固体の熱溶着性樹脂からなるテープ又は糊材付き絶縁テープ中に捕獲される。なお、抵抗溶接時には、電流を流す時間は短く、しかも、電流が流れる範囲は狭いので、熱溶着性樹脂からなるテープ又は糊材付き絶縁テープの全てが同時に溶融することは少ない。そのため、抵抗溶接時に発生したスパッタされたチリは熱溶着性樹脂からなるテープ又は糊材付き絶縁テープから飛散して電極体の内部へ入り込むことが少なくなるので、より内部短絡の発生が少なく、信頼性の高い密閉電池が得られる。なお、熱溶着性樹脂は、溶着温度が７０〜１５０℃程度であり、溶解温度は２００℃以上のものが望ましく、更には電解液等に対する耐薬品性を備えていることが望ましい。   According to the secondary battery of this aspect, the sputtered high-temperature dust generated during resistance welding is deprived of heat by partially melting a tape made of a solid heat-weldable resin or an insulating tape with a paste material. Since it cools rapidly and falls in temperature, it is easily trapped in a tape made of a solid heat-weldable resin or an insulating tape with glue. In resistance welding, since the current flow time is short and the current flow range is narrow, it is unlikely that all of the tape made of the heat-welding resin or the insulating tape with the adhesive material will melt at the same time. Therefore, the sputtered dust generated during resistance welding is less likely to scatter from the tape made of heat-welding resin or the insulating tape with adhesive, and enter the inside of the electrode body. A highly sealed battery is obtained. The heat-welding resin has a welding temperature of about 70 to 150 ° C., a melting temperature of 200 ° C. or higher is desirable, and it is desirable to have chemical resistance against an electrolytic solution and the like.

また、他の実施形態に係る二次電池においては、前記集電体及び集電体受け部品は前記抵抗溶接部分の少なくとも一方側に他方側に向かって突出する突起が設けられているものを用いて抵抗溶接されたものであることが好ましい。   Moreover, in the secondary battery according to another embodiment, the current collector and the current collector receiving part are provided with a protrusion protruding toward the other side on at least one side of the resistance welding portion. It is preferable that they are resistance welded.

この突起は、一般には「プロジェクション」とも称されているものであり、先端部の断面積が根本の断面積よりも小さくなっていることが好ましい。抵抗溶接時にこの突起の先端部分に電流が集中するので、抵抗溶接に使用されない無効電流が減少し、芯体、集電体
及び集電体受け部品等の電気抵抗が低くかつ熱伝導率が高くても効率よく強固に抵抗溶接を行うことができる。したがって、係る態様の二次電池によれば、上記効果を奏しながらも、より溶接部の信頼性が高い密閉電池が得られる。 This protrusion is generally called “projection”, and it is preferable that the cross-sectional area of the tip portion is smaller than the cross-sectional area of the root. Since current concentrates on the tip of this protrusion during resistance welding, reactive current not used for resistance welding is reduced, and the electrical resistance of the core, current collector and current collector receiving parts is low and the thermal conductivity is high. However, resistance welding can be performed efficiently and firmly. Therefore, according to the secondary battery of the aspect, a sealed battery with higher reliability of the welded portion can be obtained while exhibiting the above effects.

また、他の実施形態に係る二次電池においては、前記集電体及び集電体受け部品は、前記抵抗溶接部分の一方側に他方側に向かって突出する前記突起が設けられ、前記集電体及び集電体受け部品の他方側に前記突起と対向する部分に表面が平らな凸部が形成されているものを用いて抵抗溶接されたものであることが好ましい。   Moreover, in the secondary battery according to another embodiment, the current collector and the current collector receiving component are provided with the protrusion protruding toward the other side on one side of the resistance welding portion, and the current collector It is preferable that the other side of the body and the current collector receiving part is resistance welded using a part having a flat surface on the part facing the protrusion.

抵抗溶接時には、集電体及び集電体受け部品を両側から電極棒によって互いに押圧しながら抵抗溶接が行われるため、溶接部周囲に配置された絶縁シール材の熱溶着性樹脂自体ないし糊材が溶接部へはみ出してしまうことがある。このように熱溶着性樹脂自体ないし糊材が抵抗溶接部にはみ出した状態で抵抗溶接を行うと熱溶着性樹脂自体ないし糊材が爆発的に燃焼してしまうことがある。しかしながら、前記集電体及び集電体受け部品の他方側には前記突起と対向する部分に表面が平らな凸部を形成すると、抵抗溶接時に熱溶着性樹脂ないし糊材がはみ出ることがあっても、このはみ出た熱溶着性樹脂ないし糊材が前記突起の表面及び表面が平らな凸部の表面に達することがないため、安全かつ効率よく、強固な抵抗溶接部を有する密閉電池が得られる。   At the time of resistance welding, resistance welding is performed while pressing the current collector and current collector receiving parts from both sides with the electrode rods, so that the heat sealing resin itself or the paste material of the insulating sealing material arranged around the welded portion It may stick out to the weld. As described above, when resistance welding is performed in a state where the heat-welding resin itself or the glue material protrudes from the resistance welding portion, the heat-welding resin itself or the glue material may explosively burn. However, if a convex part with a flat surface is formed on the other side of the current collector and current collector receiving part, the heat-welding resin or paste may protrude during resistance welding. However, since the protruding heat-welding resin or paste material does not reach the surface of the protrusion and the surface of the convex portion with a flat surface, a sealed battery having a strong resistance welded portion can be obtained safely and efficiently. .

また、他の実施形態に係る二次電池においては、前記表面が平らな凸部の形状は平面視で円形状であり、前記表面が平らな凸部の径は前記突起の径よりも大きいものを用いて抵抗溶接されたものであることが好ましい。   Further, in the secondary battery according to another embodiment, the shape of the convex portion having a flat surface is a circular shape in plan view, and the diameter of the convex portion having a flat surface is larger than the diameter of the projection. It is preferable that it is resistance-welded using.

係る態様の二次電池によれば、集電体及び集電体受け部品の配置位置にずれがあっても、表面が平らな凸部と突起の先端とが対向配置された状態を維持できるため、上記本発明の効果を奏しながらも、より溶接部の信頼性が高い密閉電池が得られる。   According to the secondary battery of this aspect, even when the current collector and the current collector receiving component are misaligned, the state where the convex portion having a flat surface and the tip of the protrusion are arranged to face each other can be maintained. The sealed battery with higher reliability of the welded portion can be obtained while exhibiting the effects of the present invention.

また、他の実施形態に係る二次電池においては、前記抵抗溶接された芯体、集電体及び集電体受け部品が共に銅又は銅合金からなるものとすることができる。   In a secondary battery according to another embodiment, the resistance-welded core, current collector, and current collector receiving part may be made of copper or a copper alloy.

銅又は銅合金は、常用されている導電性金属のうち最も電気抵抗が低くかつ熱伝導率が低いものであるので、抵抗溶接時には大電流を流す必要があるため、スパッタされるチリの発生も多くなる。しかしながら、他の実施形態に係る二次電池によれば、これらの大量に発生したスパッタされたチリも抵抗溶接部の周囲の絶縁シール材中に捕獲することができるので、上記の効果を良好に奏することができる。   Since copper or copper alloy has the lowest electrical resistance and low thermal conductivity among the commonly used conductive metals, it is necessary to pass a large current at the time of resistance welding. Become more. However, according to the secondary battery according to another embodiment, the sputtered dust generated in a large amount can be captured in the insulating sealing material around the resistance welded portion, so that the above effect can be improved. Can play.

更に、他の実施形態に係る二次電池の製造方法は以下の（１）〜（３）の工程を含むことを特徴とする。
（１）両端にそれぞれ複数枚の正極芯体及び負極芯体の露出部を有する密閉電池用の電極体を形成する工程、
（２）少なくとも一方の前記芯体の露出部と集電体及び集電体受け部品の少なくとも一方の間に中央部に開口が形成された絶縁シール材が配置されるようにして、前記少なくとも一方の前記芯体の露出部の溶接箇所の両面にそれぞれ前記集電体及び前記集電体受け部品を当接する工程、
（３）前記集電体及び集電体受け部品の間に電流を流して抵抗溶接する工程。
また、係る態様の密閉電池の製造方法においては、前記（２）の工程において、少なくとも一方の前記芯体の露出部の溶接箇所の両面に、中央部に開口が形成された絶縁シール材を介して、それぞれ集電体及び集電体受け部品を当接するようにしてもよい。 Furthermore, the method for manufacturing a secondary battery according to another embodiment includes the following steps (1) to (3).
(1) A step of forming an electrode body for a sealed battery having exposed portions of a plurality of positive electrode cores and negative electrode cores at both ends,
(2) An insulating sealing material having an opening formed in a central portion is disposed between at least one of the exposed portion of the core body and at least one of the current collector and the current collector receiving component, and the at least one A step of abutting the current collector and the current collector receiving part respectively on both surfaces of the welded portion of the exposed portion of the core;
(3) A step of resistance welding by passing a current between the current collector and the current collector receiving part.
In the method for manufacturing a sealed battery according to this aspect, in the step (2), an insulating sealing material having openings at the center is formed on both surfaces of the welded portion of the exposed portion of at least one of the cores. Then, the current collector and the current collector receiving part may be brought into contact with each other.

係る態様の二次電池の製造方法によれば、抵抗溶接時には絶縁シール材の中央部に設け
られた開口を介して電流が流れる。そのため、抵抗溶接時に絶縁性テープに設けられた開口部分に電流が集中するため、溶接に関与しない無効電流が減少し、効率よく強固に抵抗溶接を行うことができる。しかも、抵抗溶接部分の周囲は絶縁性テープで囲まれているから、抵抗溶接時に発生したスパッタチリは抵抗溶接部の周囲の絶縁シール材中に捕獲されるため、外部に飛散することがない。従って、係る態様の二次電池の製造方法によれば、内部短絡の発生が少なく、信頼性の高い密閉電池が得られる。 According to the method for manufacturing a secondary battery of this aspect, current flows through the opening provided in the central portion of the insulating seal material during resistance welding. For this reason, current concentrates on the opening provided in the insulating tape during resistance welding, so that reactive current not involved in welding is reduced and resistance welding can be performed efficiently and firmly. Moreover, since the periphery of the resistance welding portion is surrounded by the insulating tape, the spatter generated during the resistance welding is trapped in the insulating sealing material around the resistance welding portion, so that it is not scattered outside. Therefore, according to the manufacturing method of the secondary battery of the aspect, a highly reliable sealed battery with less occurrence of internal short-circuit can be obtained.

また、他の実施形態に係る二次電池の製造方法においては、前記絶縁シール材は熱溶着性樹脂からなるテープ又は糊材付き絶縁テープであることが好ましい。   Moreover, in the manufacturing method of the secondary battery which concerns on other embodiment, it is preferable that the said insulating sealing material is a tape which consists of heat welding resin, or an insulating tape with a paste material.

係る態様の二次電池の製造方法によれば、容易に絶縁シール材を所定の抵抗溶接位置の周囲に配置することができるようになる。加えて、抵抗溶接時に発生するスパッタされた高温のチリは、固体の熱溶着性樹脂ないし絶縁テープを部分的に溶融することによって熱を奪われ、急速に冷却されて温度が下がるので、容易に固体の熱溶着性樹脂ないし絶縁テープ中に捕獲される。なお、抵抗溶接時には、電流を流す時間は短く、しかも、電流が流れる範囲は狭いので、固体の熱溶着性樹脂ないし絶縁テープの全てが同時に溶融することは少ない。そのため、抗溶接時に発生したスパッタされたチリは固体の熱溶着性樹脂ないし絶縁テープを飛び出して電極体の内部へ入り込むことが少なくなるので、より内部短絡の発生が少なく、信頼性の高い密閉電池が得られる。   According to the method for manufacturing a secondary battery of this aspect, the insulating sealing material can be easily disposed around a predetermined resistance welding position. In addition, high-temperature sputtered dust generated during resistance welding is easily deprived of heat by partially melting a solid heat-weldable resin or insulating tape, and rapidly cools and drops in temperature. Captured in solid heat-weldable resin or insulating tape. During resistance welding, the current flow time is short and the current flow range is narrow, so that the solid heat-weldable resin or insulating tape is unlikely to melt at the same time. Therefore, spattered dust generated during anti-welding is less likely to jump out of the solid heat-weldable resin or insulating tape and enter the electrode body, resulting in fewer internal short circuits and a highly reliable sealed battery. Is obtained.

なお、熱溶着性樹脂は、溶着温度が７０〜１５０℃程度であり、溶解温度は２００℃以上のものが望ましく、更には電解質等に対する耐薬品性を備えていることが望ましい。熱溶着性樹脂としては、ゴム系シール材、酸変性ポリプロピレン、ポリオレフィン系熱溶着性樹脂等を使用し得る。更に、糊材付き絶縁テープとしては、ポリイミドテープ、ポリプロピレンテープ、ポリフェニレンサルファイドテープ等を使用することができ、また、絶縁性熱溶着製樹脂層を有する複層構造のものであってもよい。   The heat-welding resin has a welding temperature of about 70 to 150 ° C., a melting temperature of 200 ° C. or higher is desirable, and it is desirable to have chemical resistance against an electrolyte or the like. As the heat-welding resin, rubber-based sealing materials, acid-modified polypropylene, polyolefin-based heat-welding resins, and the like can be used. Furthermore, polyimide tape, polypropylene tape, polyphenylene sulfide tape, or the like can be used as the insulating tape with paste, and it may have a multilayer structure having an insulating heat-welded resin layer.

また、他の実施形態に係る二次電池の製造方法においては、前記（２）の工程において、前記両側の集電体及び集電体受け部品の前記抵抗溶接部分の少なくとも一方側には他方側に向かって突出する突起が形成されたものを使用し、前記突起が前記絶縁シール材の中央部の開口に位置するように前記芯体の溶接箇所に当接することが好ましい。   Further, in the method for manufacturing a secondary battery according to another embodiment, in the step (2), at least one side of the resistance welding portion of the current collector on both sides and the current collector receiving part is on the other side. It is preferable to use the one formed with a protrusion protruding toward the center, and abut the welded portion of the core body so that the protrusion is located at the opening of the central portion of the insulating sealing material.

この突起は、一般には「プロジェクション」とも称されているものであり、先端部の断面積が根本の断面積よりも小さくなっていることが好ましい。抵抗溶接時にこの突起の先端部分に電流が集中するので、抵抗溶接に使用されない無効電流が減少し、芯体、集電体及び集電体受け部品等の電気抵抗が低くかつ熱伝導率が高くても効率よく強固に抵抗溶接を行うことができるようになる。加えて、この突起は絶縁シール材の中央部の開口に位置するように配置されているから、抵抗溶接前の絶縁シール材の位置ずれによる溶接部へのはみ出しを予防することができるため、抵抗溶接時に溶接部へはみ出した絶縁シール材の爆発的な燃焼をなくすことができる。従って、係る態様の二次電池の製造方法によれば、溶接部の信頼性が高い密閉電池を製造することができる。   This protrusion is generally called “projection”, and it is preferable that the cross-sectional area of the tip portion is smaller than the cross-sectional area of the root. Since current concentrates on the tip of this protrusion during resistance welding, reactive current not used for resistance welding is reduced, and the electrical resistance of the core, current collector and current collector receiving parts is low and the thermal conductivity is high. However, resistance welding can be performed efficiently and firmly. In addition, since this protrusion is arranged so as to be located at the opening of the central portion of the insulating seal material, it can prevent the protrusion to the welded portion due to the displacement of the insulating seal material before resistance welding. Explosive combustion of the insulating seal material that protrudes into the weld during welding can be eliminated. Therefore, according to the manufacturing method of the secondary battery of the aspect which concerns, the sealed battery with high reliability of a welding part can be manufactured.

また、他の実施形態に係る二次電池の製造方法においては、前記絶縁シール材の厚さは前記突起の高さの０．１〜１倍であることが好ましい。前記絶縁シール材の厚さは前記突起の高さの２／３〜１倍であることがさらに好ましい。   Moreover, in the manufacturing method of the secondary battery which concerns on other embodiment, it is preferable that the thickness of the said insulating sealing material is 0.1 to 1 time the height of the said protrusion. More preferably, the thickness of the insulating sealing material is 2/3 to 1 times the height of the protrusion.

絶縁性テープの厚さが突起の高さの０．１倍未満であると実質的に絶縁シール材がない場合と同様になり、スパッタチリが外部へ飛散するのを抑止することができなくなるために内部短絡が増加するので、好ましくない。絶縁性テープの厚さが突起の高さの２／３倍以上であるとスパッタチリの捕集効果が良好となる。また、絶縁シール材の厚さが突起の
高さの１倍を超えると、突起を芯体と直接接触させるためには、過剰の圧力が必要となるため好ましくない。 If the thickness of the insulating tape is less than 0.1 times the height of the protrusion, it will be substantially the same as when there is no insulating sealing material, and it will not be possible to prevent spatter from scattering to the outside. Since internal short circuit increases, it is not preferable. When the thickness of the insulating tape is 2/3 or more of the height of the protrusion, the effect of collecting spatter dust becomes good. In addition, if the thickness of the insulating seal material exceeds 1 times the height of the protrusion, it is not preferable because excessive pressure is required to bring the protrusion into direct contact with the core.

また、他の実施形態に係る二次電池の製造方法においては、前記絶縁シール材の中央部の開口の幅は前記突起の幅の１〜５倍であることが好ましい。   Moreover, in the manufacturing method of the secondary battery which concerns on other embodiment, it is preferable that the width | variety of the opening of the center part of the said insulating sealing material is 1 to 5 times the width | variety of the said protrusion.

絶縁シール材の中央の開口の幅が突起の幅の１倍未満であると、絶縁シール材が突起の先端部を部分的に覆うことがあるため、抵抗溶接時に溶接部に絶縁シール材が残留しやすくなり、爆発的に燃焼を起こしたり、溶接部の強度の低下及び信頼性の低下が生じるために好ましくない。また、絶縁シール材の中央部の開口の幅が突起の幅の５倍を超えると、実質的に絶縁テープがない場合と同様になり、スパッタチリが外部へ飛散するのを抑止することができなくなるために内部短絡が増加するので好ましくない。なお、本発明における絶縁性テープの中央の開口の幅ないし突起の幅は、これらの形状が円形状であれば直径を表し、これらの形状が方形状であれば最長対角間距離を示す。   If the width of the central opening of the insulating seal material is less than 1 times the width of the protrusion, the insulating seal material may partially cover the tip of the protrusion, so that the insulating seal material remains in the weld during resistance welding. This is not preferable because it tends to be explosive and burns explosively, and the weld strength decreases and the reliability decreases. Further, if the width of the opening of the central portion of the insulating seal material exceeds 5 times the width of the protrusion, it becomes substantially the same as when there is no insulating tape, and it is impossible to prevent spatter dust from scattering to the outside. Therefore, an internal short circuit increases, which is not preferable. In addition, the width | variety of the opening or protrusion of the center of the insulating tape in this invention represents a diameter if these shapes are circular, and shows the longest diagonal distance if these shapes are square.

また、他の実施形態に係る二次電池の製造方法においては、前記（２）の工程において、前記集電体及び集電体受け部品の前記抵抗溶接部分の一方側には他方側に向かって突出する前記突起が設けられ、前記集電体及び集電体受け部品の他方側には前記突起と対向する部分に表面が平らな凸部が形成されたものを使用し、前記表面が平らな凸部及び突起が絶縁シール材の中央部の開口に位置して互いに対向するよう前記芯体の溶接箇所に当接することが好ましい。   Moreover, in the manufacturing method of the secondary battery which concerns on other embodiment, in the process of said (2), toward the other side in one side of the said resistance welding part of the said electrical power collector and electrical power collector receiving components Protruding projections are provided, and the other side of the current collector and the current collector receiving part is formed with a convex portion having a flat surface at a portion facing the projection, and the surface is flat. It is preferable that the convex portion and the protrusion are in contact with the welded portion of the core body so that the convex portion and the protrusion are located in the opening of the central portion of the insulating sealing material and face each other.

係る態様の二次電池の製造方法によれば、抵抗溶接時に、絶縁シール材の熱溶着性樹脂ないし糊材がはみ出ても前記表面が平らな凸部及び突起の表面までには達せず、しかも抵抗溶接時の電流は前記突起の先端と表面が平らな凸部の表面の一部に集中して流れるため、この熱溶着性樹脂ないし糊材が爆発的に燃焼することがなくなる。しかも、この表面が平らな凸部が絶縁シール材の位置決めにもなるため、容易に抵抗溶接前の絶縁シール材の位置ずれによる溶接部へのはみ出しを予防することができ、抵抗溶接時に溶接部へはみ出した絶縁シール材の爆発的な燃焼をなくすことができる。従って、係る態様の二次電池の製造方法によれば、安全にかつ強固に抵抗溶接を行うことができるようになると共に、生産性を大きく向上させることができ、効率よく溶接部の信頼性が高い密閉電池を製造することができる。   According to the method for manufacturing a secondary battery of this aspect, even when the heat-welding resin or paste material of the insulating seal material protrudes during resistance welding, the surface does not reach the surface of the flat protrusions and protrusions. Since the current during resistance welding is concentrated on the tip of the protrusion and part of the surface of the convex portion with a flat surface, the heat-welding resin or paste material will not explode. In addition, since the convex portion having a flat surface also serves as the positioning of the insulating sealing material, it is possible to easily prevent the protruding portion of the insulating sealing material from protruding due to the displacement of the insulating sealing material before resistance welding. Explosive combustion of the insulating sealing material that protrudes can be eliminated. Therefore, according to the method of manufacturing a secondary battery of this aspect, resistance welding can be performed safely and firmly, productivity can be greatly improved, and the reliability of the welded portion can be efficiently improved. A high sealed battery can be manufactured.

また、他の実施形態に係る二次電池の製造方法においては、前記表面が平らな凸部の形状は平面視で円形状であり、前記表面が平らな凸部の径は前記突起の径よりも大きいことが好ましい。   Further, in the method for manufacturing a secondary battery according to another embodiment, the shape of the convex portion having a flat surface is circular in a plan view, and the diameter of the convex portion having a flat surface is larger than the diameter of the projection. Is also preferably large.

係る態様の二次電池の製造方法によれば、表面が平らの凸部の形成が容易にでき、しかも、集電体及び集電体受け部品の配置位置にずれがあっても表面が平らな凸部と突起の先端とが対向配置された状態を簡単に維持できるため、上記の効果を奏しながらも、より溶接部の信頼性が高い密閉電池を製造することができるようになる。   According to the method of manufacturing a secondary battery of this aspect, it is possible to easily form a convex portion having a flat surface, and even if the arrangement positions of the current collector and the current collector receiving component are misaligned, the surface is flat. Since the state in which the convex portion and the tip of the projection are arranged to face each other can be easily maintained, it is possible to manufacture a sealed battery with higher reliability of the welded portion while achieving the above effects.

また、他の実施形態に係る二次電池の製造方法においては、前記絶縁シール材の厚さは前突起の高さの０．１〜１倍であることが好ましい。前記絶縁シール材の厚さは前記突起の高さの２／３〜１倍であることがさらに好ましい。   Moreover, in the manufacturing method of the secondary battery which concerns on other embodiment, it is preferable that the thickness of the said insulating sealing material is 0.1-1 times the height of a front protrusion. More preferably, the thickness of the insulating sealing material is 2/3 to 1 times the height of the protrusion.

絶縁性テープの厚さが突起の高さの０．１倍未満であると実質的に絶縁シール材がない場合と同様になり、スパッタチリが外部へ飛散するのを抑止することができなくなるために内部短絡が増加するので、好ましくない。絶縁性テープの厚さが突起の高さの２／３倍以上であるとスパッタチリの捕集効果が良好となる。また、絶縁シール材の厚さが突起の
高さの１倍を超えると、突起を芯体と直接接触させるためには、過剰の圧力が必要となるため好ましくない。 If the thickness of the insulating tape is less than 0.1 times the height of the protrusion, it will be substantially the same as when there is no insulating sealing material, and it will not be possible to prevent spatter from scattering to the outside. Since internal short circuit increases, it is not preferable. When the thickness of the insulating tape is 2/3 or more of the height of the protrusion, the effect of collecting spatter dust becomes good. In addition, if the thickness of the insulating seal material exceeds 1 times the height of the protrusion, it is not preferable because excessive pressure is required to bring the protrusion into direct contact with the core.

また、他の実施形態に係る二次電池の製造方法においては、前記絶縁シール材の中央部の開口の幅は前記突起の幅の１〜５倍であることが好ましい。   Moreover, in the manufacturing method of the secondary battery which concerns on other embodiment, it is preferable that the width | variety of the opening of the center part of the said insulating sealing material is 1 to 5 times the width | variety of the said protrusion.

絶縁シール材の中央の開口の幅が突起の幅の１倍未満であると、絶縁シール材が突起の先端部を部分的に覆うことがあるため、抵抗溶接時に溶接部に絶縁シール材が残留しやすくなり、爆発的に燃焼を起こしたり、溶接部の強度の低下及び信頼性の低下が生じるために好ましくない。また、絶縁シール材の幅が突起の幅の５倍を超えると、実質的に絶縁テープがない場合と同様になり、スパッタチリが外部へ飛散するのを抑止することができなくなるために内部短絡が増加するので好ましくない。   If the width of the central opening of the insulating seal material is less than 1 times the width of the protrusion, the insulating seal material may partially cover the tip of the protrusion, so that the insulating seal material remains in the weld during resistance welding. This is not preferable because it tends to be explosive and burns explosively, and the weld strength decreases and the reliability decreases. Also, if the width of the insulating seal material exceeds 5 times the width of the protrusion, it becomes substantially the same as when there is no insulating tape, and it becomes impossible to prevent spatter dust from scattering to the outside. Since it increases, it is not preferable.

また、他の実施形態に係る二次電池の製造方法においては、前記絶縁シール材は熱溶着性樹脂からなるテープであり、前記熱溶着性樹脂からなるテープの厚さをＬとしたとき、前記表面が平らな凸部の高さＨは、Ｌ＜Ｈ＜（３／２）Ｌの範囲にあることが好ましい。   In the method for manufacturing a secondary battery according to another embodiment, the insulating sealing material is a tape made of a heat-welding resin, and when the thickness of the tape made of the heat-welding resin is L, The height H of the convex portion having a flat surface is preferably in the range of L <H <(3/2) L.

絶縁シール材が熱溶着性樹脂からなるテープからなる場合、特に連続的に抵抗溶接を続けると抵抗溶接用電極棒が熱くなるため、抵抗溶接の電流を流す前にこれらの熱溶着性樹脂が軟化して溶接部にはみ出す可能性がある。この場合、Ｌ≦Ｈを満たしていれば表面が平坦な凸部の表面が熱溶着性樹脂製テープよりも突き出た状態となるので、軟化した熱溶着性樹脂製テープが表面が平坦な凸部の表面にまではみ出るようなことがなくなる。また、Ｈ＜（３／２）Ｌを満たしていれば熱溶着性樹脂製テープによる抵抗溶接時のスパッタされたチリの捕集効果が良好となる。従って、熱溶着性樹脂からなるテープの厚さと表面が平らな凸部の高さが上記条件を満たしていれば、抵抗溶接時に熱溶着性樹脂がはみ出しても、この熱溶着性樹脂が表面が平らな凸部の表面にまで達することがなくなるため、抵抗溶接時にこの糊材が爆発的に燃焼することがなくなり、安全にかつ溶接部の信頼性が高い密閉電池を製造することができるようになる。   When the insulation sealing material is made of a tape made of heat-welding resin, the resistance welding electrode rods become hot when resistance welding is continued continuously, so these heat-welding resins soften before the resistance welding current flows. Then, there is a possibility of protruding into the weld. In this case, if L ≦ H is satisfied, the surface of the convex portion having a flat surface protrudes from the heat-welding resin tape, so that the softened heat-welding resin tape has a flat surface. No more sticking out of the surface. Also, if H <(3/2) L is satisfied, the effect of collecting sputtered dust during resistance welding with a heat-welding resin tape is good. Therefore, if the thickness of the tape made of the heat-welding resin and the height of the convex portion with the flat surface satisfy the above conditions, even if the heat-welding resin protrudes during resistance welding, the surface of the heat-welding resin does not Since it does not reach the surface of the flat convex part, this glue material will not explode during resistance welding, so that a sealed battery with high safety and high reliability can be manufactured. Become.

また、他の実施形態に係る二次電池の製造方法においては、前記絶縁シール材は糊材付き絶縁テープであり、前記糊材付き絶縁テープの総厚さをｔ、糊材厚さをａとしたとき、前記表面が平らな凸部の高さＨは、ａ＜Ｈ＜（３／２）ｔの範囲にあることが好ましい。   Moreover, in the manufacturing method of the secondary battery according to another embodiment, the insulating sealing material is an insulating tape with a glue material, the total thickness of the insulating tape with a glue material is t, and the glue material thickness is a. Then, the height H of the convex portion having a flat surface is preferably in the range of a <H <(3/2) t.

糊材は軟質であるために変形し易いため、抵抗溶接時に電極棒で圧力をかけた際に絶縁テープからはみ出し易い。しかしながら、ａ＜Ｈの関係にあると、糊材の厚さａは表面が平らな凸部の高さＨよりも低いため、抵抗溶接時に糊材が表面が平らな凸部を覆うことがなくなる。また、Ｈ＜（３／２）ｔの関係にあると、抵抗溶接時のスパッタされたチリの捕集効果が良好となる。したがって、糊材付き絶縁テープの総厚さと、糊材厚さと、表面が平らな凸部の高さとが上記条件を満たしていれば、安全に、信頼性の高い抵抗溶接部を備えた密閉電池を製造することができるようになる。   Since the paste material is soft and easily deformed, it easily protrudes from the insulating tape when pressure is applied with an electrode rod during resistance welding. However, if a <H, the thickness a of the glue material is lower than the height H of the convex part with the flat surface, so that the adhesive material does not cover the convex part with the flat surface during resistance welding. . Moreover, when it is in the relationship of H <(3/2) t, the collection effect of the sputtered dust at the time of resistance welding will become favorable. Therefore, if the total thickness of the insulating tape with glue, the thickness of the glue, and the height of the convex part with a flat surface satisfy the above conditions, the sealed battery having a resistance welding part that is safe and reliable. Can be manufactured.

１０：角形非水電解質二次電池
１１：偏平状の巻回電極体
１２：電池外装缶
１３：封口板
１４：正極芯体露出部
１５：負極芯体露出部
１６：正極集電体
１７：正極端子
１８１：負極集電体
１８２：突起（プロジェクション）
１８３：負極集電体受け部品
１８４：表面が平らな凸部
１９：負極端子
２０、２１：絶縁部材
２３ａ：熱溶着性樹脂製テープ
２３ｂ：糊材付き絶縁テープ
２３ｃ：絶縁テープ
２３ｄ：糊材
２３１：開口
２４１、２４２：電極棒
２５：スパッタチリ
10: Square nonaqueous electrolyte secondary battery 11: Flat wound electrode body 12: Battery outer can 13: Sealing plate 14: Positive electrode core exposed part 15: Negative electrode core exposed part 16: Positive electrode current collector 17: Positive electrode Terminal 18 1 : Negative electrode current collector 18 2 : Projection (projection)
18 3 : Negative current collector receiving part 18 4 : Convex part with flat surface 19: Negative electrode terminal 20, 21: Insulating member 23a: Heat-welding resin tape 23b: Insulating tape with glue 23c: Insulating tape 23d: Glue Material 23 1 : Opening 24 1 , 24 2 : Electrode rod 25: Sputter dust

Claims (1)

正極板と負極板とをセパレータを介して巻回した偏平状の巻回電極体と、
前記巻回電極体の一端側に設けられた正極芯体露出部に接続された正極集電体と、
前記巻回電極体の他端側に設けられた負極芯体露出部に接続された負極集電体と、
を有し、
前記正極集電体及び前記負極集電体の少なくとも一方は、前記正極芯体露出部又は前記負極芯体露出部と抵抗溶接により接続される板状の第１領域を有し、該第１領域の端部のうち前記巻回電極体の巻回軸方向中央側には折れ曲がり部が形成されており、
前記正極集電体及び前記負極集電体の少なくとも一方と抵抗溶接部分の周囲の前記正極芯体露出部又は前記負極芯体露出部との間には、絶縁シール材が配置されている二次電池。
A flat wound electrode body in which a positive electrode plate and a negative electrode plate are wound through a separator;
A positive electrode current collector connected to a positive electrode core body exposed portion provided on one end side of the wound electrode body;
A negative electrode current collector connected to a negative electrode core exposed portion provided on the other end side of the wound electrode body;
Have
At least one of the positive electrode current collector and the negative electrode current collector has a plate-shaped first region connected to the positive electrode core exposed portion or the negative electrode core exposed portion by resistance welding, and the first region of the winding axis direction central side of the wound electrode body of the ends is bent portion formed us is,
An insulating seal material is disposed between at least one of the positive electrode current collector and the negative electrode current collector and the positive electrode core exposed portion or the negative electrode core exposed portion around the resistance welding portion. battery.
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