JP4961673B2 - Method for producing tab lead for non-aqueous electrolyte battery - Google Patents

Method for producing tab lead for non-aqueous electrolyte battery Download PDF

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JP4961673B2
JP4961673B2 JP2005063814A JP2005063814A JP4961673B2 JP 4961673 B2 JP4961673 B2 JP 4961673B2 JP 2005063814 A JP2005063814 A JP 2005063814A JP 2005063814 A JP2005063814 A JP 2005063814A JP 4961673 B2 JP4961673 B2 JP 4961673B2
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tab lead
resin sheet
insulating resin
lead
outer case
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JP2006252802A (en
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浩介 田中
昭伸 千葉
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Sumitomo Electric Industries 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、正極板、負極板及び電解液をラミネートフィルムからなる外装ケースに収納してなる非水電解質電池用タブリードの製造方法に関する。 The present invention relates to a method for producing a tab lead for a nonaqueous electrolyte battery in which a positive electrode plate, a negative electrode plate, and an electrolytic solution are housed in an outer case made of a laminate film.

電子機器の小型化と共に電源としての電池の小型化、軽量化が求められている。また、高エネルギー密度化、高エネルギー効率化に対する要求もあり、このような要求を満たすものとして、リチウムイオン電池などの非水電解質電池への期待が高まっている。図３は、従来の非水電解質電池（例えば、特許文献１参照）の一例を示す図である。図中、１は外装ケース、２は積層電極群、３は正極リード、４は負極リード、５は樹脂シート、６はシール部を示す。   Along with downsizing of electronic devices, downsizing and lightening of a battery as a power source are required. In addition, there are also demands for higher energy density and higher energy efficiency, and expectations for non-aqueous electrolyte batteries such as lithium ion batteries are increasing to meet such demands. FIG. 3 is a diagram illustrating an example of a conventional nonaqueous electrolyte battery (see, for example, Patent Document 1). In the figure, 1 is an exterior case, 2 is a laminated electrode group, 3 is a positive electrode lead, 4 is a negative electrode lead, 5 is a resin sheet, and 6 is a seal portion.

非水電解質電池は、正極板、負極板をセパレータを介して積層した積層電極群２と電解液を、例えば、金属箔を含むラミネートシートからなる袋状の外装ケース１に収納し、正負の電極板に接続した正極リード３、負極リード４をシール部６から密封状態で外部に取り出して構成される。外装ケース１のラミネートシートは、アルミ、銅、ステンレス等の金属からなる金属箔の両面を樹脂フィルムに貼り合わせて形成される。   The nonaqueous electrolyte battery includes a laminated electrode group 2 in which a positive electrode plate and a negative electrode plate are laminated via a separator and an electrolytic solution, for example, in a bag-like outer case 1 made of a laminate sheet containing a metal foil, and positive and negative electrodes. The positive electrode lead 3 and the negative electrode lead 4 connected to the plate are taken out from the seal portion 6 in a sealed state. The laminate sheet of the outer case 1 is formed by bonding both surfaces of a metal foil made of a metal such as aluminum, copper, and stainless steel to a resin film.

外装ケース１は、例えば、矩形状に裁断された２枚のラミネートフィルムの周辺のシール部６を、熱溶着によりシールすることにより外装ケース１内が密封される。正極リード３、負極リード４は、外装ケース１のシール部６からの取出し部分に、樹脂シート５が予め熱溶着によって接合されている。この樹脂シート５により、外装ケース１のラミネートシートに対してシール性の低下を防止している。   The exterior case 1 is sealed in the exterior case 1 by sealing, for example, the sealing portion 6 around the two laminated films cut into a rectangular shape by thermal welding. The positive electrode lead 3 and the negative electrode lead 4 have a resin sheet 5 bonded in advance to a portion taken out from the seal portion 6 of the outer case 1 by heat welding. The resin sheet 5 prevents a decrease in sealing performance with respect to the laminate sheet of the outer case 1.

また、この正極リード３及び負極リード４の取出し部の樹脂シート５は、例えば、特許文献２に開示のように、外装ケース１（封入袋）の金属箔と電気的短絡が生じないようにして密封状態で取出される。このため、樹脂シート５（絶縁体）は、低融点の内側絶縁層とこれよりは融点が高く外装ケース１のシール部６のヒートシール温度では溶融しない外側絶縁層の２層で形成している。   Further, the resin sheet 5 at the take-out portion of the positive electrode lead 3 and the negative electrode lead 4 is made not to cause an electrical short circuit with the metal foil of the outer case 1 (encapsulated bag) as disclosed in, for example, Patent Document 2. Removed in a sealed state. For this reason, the resin sheet 5 (insulator) is formed of two layers of an inner insulating layer having a low melting point and an outer insulating layer that has a higher melting point than that and does not melt at the heat seal temperature of the seal portion 6 of the outer case 1. .

この特許文献２では、正負極リードの取出し部分に、予め内側絶縁層を加熱溶融して密封接着させた後、外装ケース１のシール部６に挟み込まれる。この後、外装ケース１の周辺のシール部６をヒートシールで封止するが、外側絶縁層はこのヒートシール時の温度では、溶融されない材料で形成されている。このため、正負極リード３，４の金属と外装ケース１の金属箔とが電気的に短絡しないとされている。
特開２０００−２８５９０４号公報 特許３５０５９０５号公報 In Patent Document 2, the inner insulating layer is heated and melted and sealed in advance at the lead-out portion of the positive and negative electrode leads, and then sandwiched between the seal portions 6 of the outer case 1. Thereafter, the sealing portion 6 around the outer case 1 is sealed by heat sealing, and the outer insulating layer is formed of a material that is not melted at the temperature at the time of heat sealing. For this reason, the metal of the positive and negative electrode leads 3 and 4 and the metal foil of the outer case 1 are not electrically short-circuited.
JP 2000-285904 A Japanese Patent No. 3505905

図４は、上述の特許文献１及び２に開示の正負極リードの引出し状態を簡略的に示したものである。タブリード７は、上述の正負極リード３，４に相当するもので、外装ケース１のシール部６で封着されて取出される部分に、絶縁樹脂シート８が接着又は融着により設けられる。この絶縁樹脂シート８は、上述の樹脂シート５に相当するもので、タブリード７の金属面に接着又は溶着する内側層８ａと外装ケース１と融着される外側層８ｂからなるものとする。通常、正常なタブリード７の封着は、図４（Ａ）及び図４（Ｃ）の左側に位置するタブリードで示すように、絶縁樹脂シート８の上端が外装ケース１の上縁から外側に僅かにはみ出るような状態で封着される。   FIG. 4 shows a simplified drawing of the positive and negative electrode leads disclosed in Patent Documents 1 and 2 described above. The tab lead 7 corresponds to the above-described positive and negative electrode leads 3, 4, and an insulating resin sheet 8 is provided by adhesion or fusion at a portion sealed and taken out by the seal portion 6 of the outer case 1. The insulating resin sheet 8 corresponds to the above-described resin sheet 5 and is composed of an inner layer 8 a that is bonded or welded to the metal surface of the tab lead 7 and an outer layer 8 b that is fused to the outer case 1. Normally, the normal tab lead 7 is sealed with the upper end of the insulating resin sheet 8 slightly outward from the upper edge of the outer case 1 as shown by the tab lead located on the left side of FIGS. 4 (A) and 4 (C). Sealed in a protruding state.

しかし、図４（Ｂ）及び図４（Ｃ）の右側に位置するタブリードで示すように、タブリード７の封着位置の検出精度が悪く、絶縁樹脂シート８の上端が外装ケース１の上縁から内側に入り込むような封着状態となることがある。この場合、点線領域Ｓで示すような部分で絶縁樹脂シート８が欠如して、外装ケース１内の金属箔とタブリード７とが電気的に短絡を生じる恐れがある。   However, as indicated by the tab lead located on the right side of FIGS. 4B and 4C, the detection accuracy of the sealing position of the tab lead 7 is poor, and the upper end of the insulating resin sheet 8 extends from the upper edge of the exterior case 1. It may be in a sealed state that enters inside. In this case, there is a possibility that the insulating resin sheet 8 is lacking at a portion as indicated by the dotted line region S, and the metal foil in the outer case 1 and the tab lead 7 are electrically short-circuited.

また、タブリード７は、例えば、図５に示すような方法で連続的に作製される。この例は、図５（Ａ）に示すように、タブリード用の帯状金属シート９の長手方向に沿って、両面に所定の間隔で絶縁樹脂シート８が接着又は溶着され、ラインＬで順次切断することにより、図５（Ｂ）〜（Ｄ）に示すようなタブリード７が作製される。切断ラインＬは、絶縁樹脂シート８の中心ラインＭに沿って基準位置を検出し切断されるが、切断機による位置のバラツキがある。また、切断後のタブリード７を外装ケース１のシール部６に封入する際に、タブリード７の切断部分を基準に位置決めを行なうとタブリード７の歪みや巻きぐせの影響でさらにバラツキが発生する。   Further, the tab lead 7 is continuously manufactured by a method as shown in FIG. 5, for example. In this example, as shown in FIG. 5A, the insulating resin sheets 8 are bonded or welded to both surfaces at predetermined intervals along the longitudinal direction of the strip-shaped metal sheet 9 for tab leads, and are sequentially cut along a line L. Thus, the tab lead 7 as shown in FIGS. 5B to 5D is manufactured. The cutting line L is cut by detecting the reference position along the center line M of the insulating resin sheet 8, but there is a variation in position due to the cutting machine. Further, when the tab lead 7 after cutting is enclosed in the seal portion 6 of the outer case 1, if the positioning is performed with reference to the cut portion of the tab lead 7, the tab lead 7 is further distorted due to distortion or winding.

そこで、位置決め精度を高めるために、タブリード７の両側縁から多少突き出る絶縁樹脂シート８のマージン部８ｃ（耳部分）を用いる方法が考えられる。しかし、絶縁樹脂シート８のマージン部８ｃは、図５（Ｂ）に示すように熱収縮したようなマージン部であったり、図５（Ｃ）に示すように変形が生じたようなマージン部であったり、また、図５（Ｄ）に示すような接着樹脂が流れ出した状態のマージン部であったりする。このため、マージン部８ｃをタブリード７の位置決めに利用することは現実的でない。そこで、従来は、位置決めのバラツキを考慮して、シール部６の幅に対して絶縁樹脂シート８の幅を大きくしている。しかし、絶縁樹脂シート８の幅を大きくすると、タブリード７が長くなり電池内部に余分なスペースを必要とし、小型化の妨げとなる。   Therefore, in order to increase the positioning accuracy, a method of using a margin portion 8c (ear portion) of the insulating resin sheet 8 protruding slightly from both side edges of the tab lead 7 can be considered. However, the margin portion 8c of the insulating resin sheet 8 is a margin portion that is thermally contracted as shown in FIG. 5B, or a margin portion that is deformed as shown in FIG. 5C. Or a margin portion where the adhesive resin flows out as shown in FIG. For this reason, it is not realistic to use the margin portion 8 c for positioning the tab lead 7. Therefore, conventionally, the width of the insulating resin sheet 8 is made larger than the width of the seal portion 6 in consideration of variations in positioning. However, if the width of the insulating resin sheet 8 is increased, the tab lead 7 becomes longer, requiring an extra space inside the battery, which hinders downsizing.

本発明は、上述した実状に鑑みてなされたもので、タブリードの外装ケースへの封着に際して、タブリードの位置決めを正確に行なうことができる非水電解質電池用タブリードの製造方法の提供を課題とする。 The present invention has been made in view of the actual shape described above, and issues upon sealing to the outer casing of the tab leads, to provide a method for producing the interconnector for a non-aqueous electrolyte battery can be positioned in the tab lead exactly To do.

本発明による非水電解質電池用タブリードの製造方法は、正極板、負極板及び電解液を、金属箔を含むラミネートフィルムからなる外装ケースに収納してなる非水電解質電池用で、外装ケースのシール部に封着される取出し部分を絶縁樹脂シールで覆ったタブリードの製造方法であって、タブリード金属に絶縁樹脂シートを熱溶着した後に、絶縁樹脂シートの上縁を基準にして、絶縁樹脂シートのマージン部またはタブリード金属にタブリードを封着するための位置決め用の切り欠きを形成することを特徴とする。 The method for producing a tab lead for a non-aqueous electrolyte battery according to the present invention is for a non-aqueous electrolyte battery in which a positive electrode plate, a negative electrode plate, and an electrolytic solution are housed in an outer case made of a laminate film containing a metal foil. A method of manufacturing a tab lead in which a take-out portion sealed with a part is covered with an insulating resin seal, and the insulating resin sheet is thermally welded to the tab lead metal, and then the upper edge of the insulating resin sheet is used as a reference. A notch for positioning for sealing the tab lead is formed in the margin portion or the tab lead metal .

本発明によれば、タブリードの外装ケースからの取出し部の一部に位置決め用の切り欠きを設けるだけの簡単な構成で、外装ケースに対してタブリードを正確に位置決めして封着でき、良好なシール性と電気絶縁性を確保し、絶縁樹脂シートの幅を大きくとる必要が無くなるため小型化を可能にすることができる。   According to the present invention, the tab lead can be accurately positioned and sealed with respect to the exterior case with a simple configuration in which a notch for positioning is provided in a part of the tab lead taken out from the exterior case. Since sealing properties and electrical insulation properties are secured and it is not necessary to increase the width of the insulating resin sheet, it is possible to reduce the size.

図により本発明の実施の形態を説明する。図１（Ａ）は、本発明の製造方法により製造される非水電解質電池用タブリードの概略を示す図、図１（Ｂ）は、同タブリードを用いた非水電解質電池の概略を示す図である。図中、１は外装ケース、６はシール部、７はタブリード、８は絶縁樹脂シート、８ｃはマージン部、１０は切り欠きを示す。 Embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a diagram showing an outline of a tab lead for a nonaqueous electrolyte battery produced by the production method of the present invention, and FIG. 1B is a diagram showing an outline of a nonaqueous electrolyte battery using the tab lead. is there. In the figure, 1 is an exterior case, 6 is a seal portion, 7 is a tab lead, 8 is an insulating resin sheet, 8c is a margin portion, and 10 is a notch.

本発明の製造方法により製造されるタブリード７は、図３で非水電解質電池の正極及び負極リードとして説明したのと同様な形状と使用形態を有している。また、上記のタブリード７を用いた非水電解質電池も、図３で説明したのと同様な構成で、正極板、負極板をセパレータを介して積層した積層電極群と電解液を、例えば、金属箔を含むラミネートシートからなる袋状の外装ケース１に収納し、正負の電極板に接続したタブリード７をシール部６で封着して密封状態で外部に取出す構成である。 The tab lead 7 manufactured by the manufacturing method of the present invention has the same shape and usage as described as the positive electrode and negative electrode lead of the nonaqueous electrolyte battery in FIG. Further, the non-aqueous electrolyte battery using the tab lead 7 has the same configuration as that described with reference to FIG. 3, and a laminated electrode group obtained by laminating a positive electrode plate and a negative electrode plate with a separator interposed therebetween and an electrolytic solution, for example, a metal The tab lead 7 is housed in a bag-like outer case 1 made of a laminate sheet containing foil, and is connected to positive and negative electrode plates. The tab lead 7 is sealed with a seal portion 6 and taken out outside in a sealed state.

外装ケース１のラミネートシートは、アルミ、銅、ステンレス等の金属からなる金属箔を含んで例えば、３〜５層の積層体で形成される。その最内層フィルムは、電解液で溶解されずシール部分から電解液が漏出するのを防止するものとして、例えば、酸変性ポリオレフィン（例：無水マレイン酸変性低密度ポリエチレン）で形成される。最外層フィルムは、内側の金属箔を外傷から保護するためにポリエチレンテレフタレート（略称ＰＥＴ）等で形成される。   The laminate sheet of the exterior case 1 includes a metal foil made of a metal such as aluminum, copper, and stainless steel, and is formed of, for example, a 3 to 5 layered product. The innermost layer film is formed of, for example, an acid-modified polyolefin (for example, maleic anhydride-modified low-density polyethylene) as a solution that prevents the electrolyte from leaking from the seal portion without being dissolved by the electrolyte. The outermost layer film is formed of polyethylene terephthalate (abbreviated as PET) or the like in order to protect the inner metal foil from damage.

外装ケース１内に収容される電解質としては、プロピレンカーボネート、エチレンカーボネート、ジエチルカーボネート、ジメチルカーボネート、１，２−ジメトキシエタン、テトラヒドロドフランなどの有機溶媒に、ＬｉＣｌＯ４、ＬｉＢＦ４、ＬｉＰＦ６、ＬｉＡｓＦ６等を溶解させた非水電解液や、リチウムイオン伝導性の固体電解質などが用いられる。 Examples of the electrolyte housed in the outer case 1 include organic solvents such as propylene carbonate, ethylene carbonate, diethyl carbonate, dimethyl carbonate, 1,2-dimethoxyethane, and tetrahydrodofuran, LiClO 4 , LiBF 4 , LiPF 6 , LiAsF. A nonaqueous electrolytic solution in which 6 or the like is dissolved, a lithium ion conductive solid electrolyte, or the like is used.

正負の電極板は、セパレータを挟んで対峙する集電体と呼ばれる金属箔又はエキスパンドメタル等の金属基材上に活性物質層を形成した構造を有している。正極板の金属基材には、例えば、アルミの電極導電体が用いられ、負極板の金属基材には、銅又はニッケルからなる電極導電体が用いられる。正負の電極板の間に配されるセパレータは、電気的絶縁性を保持し、且つ、イオン伝導性を保持するポリオレフィン系の多孔膜で形成される。   The positive and negative electrode plates have a structure in which an active material layer is formed on a metal base material such as a metal foil or an expanded metal called a current collector facing each other with a separator interposed therebetween. For example, an aluminum electrode conductor is used for the metal substrate of the positive electrode plate, and an electrode conductor made of copper or nickel is used for the metal substrate of the negative electrode plate. The separator disposed between the positive and negative electrode plates is formed of a polyolefin-based porous film that retains electrical insulation and ion conductivity.

タブリード７は、その内端を正負の電極板に一体に形成されている接続片に、スポット溶接や超音波溶接等により接続される。正電極に接続されるタブリード７は、正の高電位となるので電解液との接触により溶解が生じないように、正極板の電極導電体と同じアルミ、或いはこれらの合金で形成されているのが好ましい。また、負電極に接続されるタブリード７は、過充電でリチウムが析出し過放電で電位が高くなることから、リチウムに腐食されにくく、リチウムと合金が形成されにくく、且つ、高電位で溶解されにくいように、負電極の電極導電体と同じ銅又はニッケル或いはこれらの合金で形成されているのが好ましい。   The tab lead 7 is connected to a connecting piece whose inner end is integrally formed with positive and negative electrode plates by spot welding, ultrasonic welding or the like. The tab lead 7 connected to the positive electrode is made of the same aluminum as the electrode conductor of the positive electrode plate or an alloy thereof so as not to be dissolved by contact with the electrolyte because it has a positive high potential. Is preferred. Further, the tab lead 7 connected to the negative electrode is liable to be corroded by lithium, to form an alloy with lithium, and to be dissolved at a high potential because lithium is deposited by overcharge and the potential becomes high by overdischarge. In order to make it difficult, it is preferable that the negative electrode electrode conductor is formed of the same copper, nickel, or an alloy thereof.

タブリード７の取出し部分を覆って外装ケース１に封着され、且つ電気絶縁を形成する絶縁樹脂シート８は、図４で説明したように、接着層としての内側層８ａと絶縁層としての外側層８ｂの２層で形成するのが好ましい。そして、内側層８ａは、比較的溶融温度が低い樹脂材料で形成され、タブリード７の金属面に密封状に接着させる。この内側層８ａには、例えば、熱可塑性ポリオレフィン樹脂等、好ましくは低密度ポリエチレン或いは酸変性低密度ポリエチレンが用いられ、タブリード７の金属面に熱溶着される。   As described with reference to FIG. 4, the insulating resin sheet 8 that covers the lead-out portion of the tab lead 7 and is sealed to the outer case 1 and that forms electrical insulation includes the inner layer 8 a as an adhesive layer and the outer layer as an insulating layer. It is preferable to form with two layers of 8b. The inner layer 8a is formed of a resin material having a relatively low melting temperature, and is adhered to the metal surface of the tab lead 7 in a sealing manner. For this inner layer 8 a, for example, a thermoplastic polyolefin resin or the like, preferably low-density polyethylene or acid-modified low-density polyethylene is used, and is thermally welded to the metal surface of the tab lead 7.

外側層８ｂは、外装ケース１のヒートシール温度では溶融しない樹脂材料で形成され、外装ケース１に融着してタブリード７を密封状態で引き出す。この外側層８ｂには、例えば、架橋ポリオレフィン樹脂、好ましくは架橋された低密度ポリエチレン或いはエチレン−ビニルアルコール重合体、ポリプロピレンが用いられる。外装ケース１の最内層フィルムが酸変性低密度ポリエチレンで形成されている場合、シール部６は１１０℃程度でヒートシールされるが、このヒートシール温度では外側層８ｂは溶融されず、タブリード７の取り出し部分において、外装ケース１の金属箔との電気的絶縁を確保することができる。   The outer layer 8b is formed of a resin material that does not melt at the heat seal temperature of the outer case 1, and is fused to the outer case 1 to pull out the tab lead 7 in a sealed state. For the outer layer 8b, for example, a cross-linked polyolefin resin, preferably a cross-linked low density polyethylene, an ethylene-vinyl alcohol polymer, or polypropylene is used. When the innermost layer film of the outer case 1 is formed of acid-modified low-density polyethylene, the seal portion 6 is heat-sealed at about 110 ° C., but the outer layer 8b is not melted at this heat-sealing temperature, and the tab lead 7 In the take-out portion, electrical insulation from the metal foil of the outer case 1 can be ensured.

上述する構成で、外装ケース１のシール部６にタブリード７を、図４（Ａ）で説明したような正常な位置で密封接着（封着）することにより、良好な絶縁特性と長寿命を維持することが可能となる。しかし、図４（Ｂ）で説明したように、絶縁樹脂シート８の封着位置がずれることにより、電気的短絡の恐れが生じ、また、密封状態も不完全となりやすい。したがって、本発明では、タブリード７の絶縁樹脂シート８を含む外装ケース１からの取出し部分に、位置決め用の切り欠き１０を設けている。   With the configuration described above, the tab lead 7 is hermetically bonded (sealed) to the seal portion 6 of the outer case 1 at the normal position as described with reference to FIG. It becomes possible to do. However, as described with reference to FIG. 4B, the sealing position of the insulating resin sheet 8 is shifted, which may cause an electrical short circuit, and the sealed state tends to be incomplete. Therefore, in the present invention, the notch 10 for positioning is provided at a portion where the tab lead 7 is taken out from the outer case 1 including the insulating resin sheet 8.

図２は、本発明による位置決め用の切り欠きについて説明する図である。図２（Ａ）は従来の切り欠きを有しない例を示す図、図２（Ｂ）〜図２（Ｄ）は、位置決め用の切り欠きの各種の形成例を示す図である。図中の符号は、図１及び図５で使用したのと同じ符号を用いることにより説明を省略する。   FIG. 2 is a diagram for explaining a positioning notch according to the present invention. FIG. 2A is a view showing an example having no conventional notch, and FIGS. 2B to 2D are views showing various examples of forming a notch for positioning. The reference numerals in the figure are the same as those used in FIGS.

通常、外装ケースからの取出し部分に予め接着される絶縁樹脂シート８は、図５で説明したようにタブリード７の側縁７ａからはみ出るマージン部８ｃを有している。このマージン部８ｃは、タブリード７の側縁７ａを完全に封着するのに必要な部分である。図２（Ａ）のように、このマージン部８ｃを含む外装ケースからの取出し部分に何の加工も施さない場合は、図４又は図５で説明したように、絶縁樹脂シート８の位置決めを精度よく行なうことができない。   Usually, the insulating resin sheet 8 that is bonded in advance to a portion taken out from the outer case has a margin portion 8c that protrudes from the side edge 7a of the tab lead 7 as described with reference to FIG. The margin portion 8c is a portion necessary for completely sealing the side edge 7a of the tab lead 7. As shown in FIG. 2A, when no processing is performed on the part taken out from the outer case including the margin portion 8c, the insulating resin sheet 8 is accurately positioned as described with reference to FIG. I can't do it well.

本発明では、例えば、図２（Ｂ）に示したように、マージン部８ｃに外装ケース１への封着の位置決め用の切り欠き１０を設ける。この切り欠き１０は、外装ケース１の外側又は内側（電池の外側又は内側）の何れの側に形成してもよい。マージン部８ｃ自体は、図５（Ｂ）〜図５（Ｄ）で説明したように、位置決めに用いることは適当でないが、例えば、絶縁樹脂シート８の上縁を基準にしてマージン部８ｃに切り欠き１０を正確に形成することはできる。この切り欠き１０を基準にして、外装ケース１のシール部６に対する絶縁樹脂シート８の位置関係を定めることにより、正常で品質が一定した封着を行なうことができる。   In the present invention, for example, as shown in FIG. 2B, a notch 10 for positioning the sealing to the outer case 1 is provided in the margin portion 8c. The notch 10 may be formed on either the outer side or the inner side (the outer side or the inner side of the battery) of the outer case 1. The margin portion 8c itself is not suitable for use in positioning as described with reference to FIGS. 5B to 5D. For example, the margin portion 8c is cut into the margin portion 8c using the upper edge of the insulating resin sheet 8 as a reference. The notch 10 can be accurately formed. By defining the positional relationship of the insulating resin sheet 8 with respect to the seal portion 6 of the outer case 1 with the notch 10 as a reference, normal and constant quality sealing can be performed.

図２（Ｃ）及び図２（Ｄ）は、マージン部８ｃの外方へのはみ出し量が少ないような場合に、タブリード７の金属部の側縁７ａに切り欠き１０を形成する例を示したものである。図２（Ｃ）は、切り欠き１０は、タブリード７の金属部のみに形成され、絶縁樹脂シート８には達しない程度で形成する例である。図２（Ｄ）は、タブリード７の金属部から絶縁樹脂シートにまで達するように、切り欠き１０が形成された例である。図２（Ｄ）の場合は、図２（Ｃ）の場合より、切り欠き１０の長さを大きく取ることができるので、位置決めの精度を高めることができる。また、図２（Ｃ）及び図２（Ｄ）の何れの場合も、切り欠き１０をＬ字状にタブリード７の側縁７ａに沿って端部まで切り欠く以外に、切り欠き１０’で示すようにコ字状に切り欠くようにしてもよい。   2C and 2D show an example in which the notch 10 is formed in the side edge 7a of the metal portion of the tab lead 7 when the margin 8c protrudes outward little. Is. FIG. 2C shows an example in which the notch 10 is formed only in the metal portion of the tab lead 7 and does not reach the insulating resin sheet 8. FIG. 2D shows an example in which the notch 10 is formed so as to reach the insulating resin sheet from the metal portion of the tab lead 7. In the case of FIG. 2 (D), since the length of the notch 10 can be made larger than in the case of FIG. 2 (C), the positioning accuracy can be increased. 2C and 2D, the notch 10 is indicated by a notch 10 ′ in addition to notching the notch 10 to the end along the side edge 7a of the tab lead 7 in an L shape. As shown in FIG.

また、タブリード７は、絶縁樹脂シート８により表面を密封封止されているとしても、外部から水分が浸入し、内部の電解液との反応によりフッ化水素酸が発生し、その表面は長期にわたって徐々にフッ化水素酸により腐食され、絶縁樹脂シート８との密封形態が破壊され、液漏れの原因となると共に特性が低下することがある。このため、タブリード７には、その金属表面に化成処理を施したり、メッキ処理を施したものが使用されることがある。このようにタブリードの金属表面が処理されている場合、図２（Ｃ）及び図２（Ｄ）の例では、切り欠き１０の形成によりタブリードの側縁部７ａに金属素肌が露出することになるので、切り欠き１０は、外装ケース１の外側になるように設けるのが好ましい。この結果、切り欠きによってタブリードの腐食防止の処理が除去されてしまっても、特に問題は生じない。   Further, even if the surface of the tab lead 7 is hermetically sealed with the insulating resin sheet 8, moisture enters from the outside, and hydrofluoric acid is generated by reaction with the internal electrolyte, and the surface is kept for a long time. It is gradually corroded by hydrofluoric acid, and the sealed form with the insulating resin sheet 8 is destroyed, which may cause liquid leakage and deteriorate characteristics. For this reason, the tab lead 7 may be formed by subjecting its metal surface to chemical conversion treatment or plating treatment. When the metal surface of the tab lead is thus treated, in the example of FIGS. 2C and 2D, the metal skin is exposed to the side edge portion 7a of the tab lead by forming the notch 10. Therefore, the notch 10 is preferably provided so as to be outside the outer case 1. As a result, there is no particular problem even if the tab lead corrosion prevention treatment is removed by the notch.

本発明によるタブリードと非水電解質電池の概略を示す図である。It is a figure which shows the outline of the tab lead and nonaqueous electrolyte battery by this invention. 本発明によるタブリードの形成例を説明する図である。It is a figure explaining the example of formation of the tab lead by this invention. 従来技術を説明する図である。It is a figure explaining a prior art. 従来技術における問題点を説明する図である。It is a figure explaining the problem in a prior art. 従来技術における他の問題点を説明する図である。It is a figure explaining the other problem in a prior art.

符号の説明Explanation of symbols

１…外装ケース、２…積層電極群、３…正極リード、４…負極リード、５…樹脂シート、６…シール部、７…タブリード、８…絶縁樹脂シート、８ａ…内側層、８ｂ…外側層、８ｃ…マージン部、９…帯状金属シート、１０，１０’…切り欠き。 DESCRIPTION OF SYMBOLS 1 ... Exterior case, 2 ... Laminated electrode group, 3 ... Positive electrode lead, 4 ... Negative electrode lead, 5 ... Resin sheet, 6 ... Seal part, 7 ... Tab lead, 8 ... Insulating resin sheet, 8a ... Inner layer, 8b ... Outer layer , 8c ... margin portion, 9 ... strip-shaped metal sheet, 10, 10 '... notches.

Claims (1)

正極板、負極板及び電解液を、金属箔を含むラミネートフィルムからなる外装ケースに収納してなる非水電解質電池用で、外装ケースのシール部に封着される取出し部分を絶縁樹脂シートで覆ったタブリードの製造方法であって、
タブリード金属に前記絶縁樹脂シートを熱溶着した後に、前記絶縁樹脂シートの上縁を基準にして、前記絶縁樹脂シートのマージン部または前記タブリード金属にタブリードを封着するための位置決め用の切り欠きを形成することを特徴とする非水電解質電池用タブリードの製造方法。 The positive electrode plate, a negative electrode plate and electrolyte, in a non-aqueous electrolyte battery comprising housed in an exterior case made of a laminate film including a metal foil, a take-out portion to be sealed to the sealing portion of the case with an insulating resin sheet A method of manufacturing a covered tab lead,
After thermally welding the insulating resin sheet to the tab lead metal, a positioning notch for sealing the tab lead to the margin portion of the insulating resin sheet or the tab lead metal with reference to the upper edge of the insulating resin sheet A method for producing a tab lead for a nonaqueous electrolyte battery, characterized by comprising :
JP2005063814A 2005-03-08 2005-03-08 Method for producing tab lead for non-aqueous electrolyte battery Expired - Fee Related JP4961673B2 (en)

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