JP5673749B2 - Tab leads and batteries - Google Patents

Tab leads and batteries Download PDF

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JP5673749B2
JP5673749B2 JP2013151369A JP2013151369A JP5673749B2 JP 5673749 B2 JP5673749 B2 JP 5673749B2 JP 2013151369 A JP2013151369 A JP 2013151369A JP 2013151369 A JP2013151369 A JP 2013151369A JP 5673749 B2 JP5673749 B2 JP 5673749B2
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tab lead
aluminum foil
electrode plate
enclosure
insulating resin
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JP2014038838A (en
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暁彦 田口
暁彦 田口
田中　浩介
浩介 田中
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Sumitomo Electric Industries Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Materials Engineering (AREA)

Description

本発明は、電池から電気を取り出す端子として用いられるアルミニウム箔からなるタブリードおよび該タブリードを用いた電池に関する。   The present invention relates to a tab lead made of an aluminum foil used as a terminal for taking out electricity from a battery, and a battery using the tab lead.

アルミニウム箔からなるタブリードは、例えば、リチウムイオン電池やリチウムイオンキャパシタ等の電池の正極側のリード部材として使用されている。このタブリードは、例えば、特許文献１，２に開示されるように、アルミニウム箔からなる長方形状の平形導体の中央部分の両面を絶縁樹脂フィルムで覆い、この絶縁樹脂フィルム部分を電池の封入体で密封封止して、電気を外部に取り出すようにしている。   Tab leads made of aluminum foil are used as a lead member on the positive electrode side of batteries such as lithium ion batteries and lithium ion capacitors. For example, as disclosed in Patent Documents 1 and 2, this tab lead covers both sides of a central portion of a rectangular flat conductor made of aluminum foil with an insulating resin film, and this insulating resin film portion is covered with a battery enclosure. It is hermetically sealed to take out electricity.

特開２００１−１０２０１６号公報Japanese Patent Laid-Open No. 2001-102016 特開２０１１−１８１３００号公報JP 2011-181300 A

上記の電池にアルミニウム箔からなるタブリードを取り付けた状態で衝撃（落下等）が加わると、タブリードの電池内の部分でアルミニウム箔が破断することがある。
本発明は、上記の実状に鑑みてなされたもので、上記のような衝撃により破断の生じにくいアルミニウム箔からなるタブリードとこれを用いた電池の提供を目的とする。 When an impact (dropping or the like) is applied to the battery with a tab lead made of aluminum foil attached thereto, the aluminum foil may break at a portion of the tab lead in the battery.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tab lead made of an aluminum foil which is not easily broken by the impact as described above, and a battery using the tab lead.

本発明によるタブリードは、耐電解液性を付与する表面処理が施されたアルミニウム箔からなる長方形状の平形導体の両面から、該平形導体の縦方向の両端側が露出され幅方向の両端の一部を覆って外方にはみ出るように、絶縁樹脂フィルムが貼り合わされたタブリードであって、上記絶縁樹脂フィルムを貼った後の上記のアルミニウム箔の抗張力が、８５Ｎ／ｍｍ２以上であることを特徴とする。また、上記絶縁樹脂フィルムを貼った後の上記のアルミニウム箔は、破断伸びが１５％以上で、鉄が従来より多い１.２〜１.７重量％が含まれていることが好ましい。なお、アルミニウム箔の厚さが０.０５ｍｍ〜０.５ｍｍであることが好ましい。 The tab lead according to the present invention is formed by exposing both ends of the flat conductor in the vertical direction from both sides of a rectangular flat conductor made of an aluminum foil that has been subjected to a surface treatment that imparts electrolyte resistance. A tab lead to which an insulating resin film is bonded so as to protrude outwardly, and the tensile strength of the aluminum foil after the insulating resin film is bonded is 85 N / mm 2 or more. To do. Moreover, it is preferable that said aluminum foil after sticking the said insulating resin film is 1.2 to 1.7 weight% whose breaking elongation is 15% or more and iron is more than before. In addition, it is preferable that the thickness of aluminum foil is 0.05 mm-0.5 mm.

また、本発明による電池は、正極板と負極板とをセパレータを介して積層した積層電極群と電解液を、金属箔を含む多層フィルムからなる封入体に収納した電池であって、上記のタブリードを正極板または負極板に接続して封入体から取り出し、上記のタブリードが封入体と接する箇所が密閉されていることを特徴とする。   A battery according to the present invention is a battery in which a laminated electrode group in which a positive electrode plate and a negative electrode plate are laminated via a separator and an electrolytic solution are housed in an enclosure made of a multilayer film including a metal foil, and the tab lead described above. Is connected to the positive electrode plate or the negative electrode plate and taken out from the enclosure, and the portion where the tab lead contacts the enclosure is sealed.

本発明によれば、衝撃により破断の生じにくいアルミニウム箔からなるタブリードとこれを用いた電池を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the tab lead which consists of aluminum foil which cannot be easily broken by an impact, and a battery using the same can be provided.

本発明によるタブリードの使用形態の一例を示す図である。It is a figure which shows an example of the usage condition of the tab lead by this invention. 本発明によるタブリードの構造の概略を説明する図である。It is a figure explaining the outline of the structure of the tab lead by this invention.

図１，２により、本発明によるタブリードの概略とその使用形態を説明する。図１（Ａ）は、非水電解質電池の外観を示す図、図１（Ｂ）はタブリードの封着状態を示す図、図２はタブリードの一例を示す図である。図中、１は非水電解質電池、２は封入体、２ａは最内層フィルム、２ｂは金属箔層、２ｃは最外層フィルム、３は正極側のタブリード、３’は負極側のタブリード、４は平形導体、５は絶縁樹脂フィルム、６はシール部、７は電極板リードを示す。   1 and 2, the outline of the tab lead according to the present invention and its usage will be described. FIG. 1A is a diagram showing an external appearance of a nonaqueous electrolyte battery, FIG. 1B is a diagram showing a sealed state of tab leads, and FIG. 2 is a diagram showing an example of tab leads. In the figure, 1 is a nonaqueous electrolyte battery, 2 is an enclosure, 2a is an innermost layer film, 2b is a metal foil layer, 2c is an outermost layer film, 3 is a tab lead on the positive electrode side, 3 'is a tab lead on the negative electrode side, A flat conductor, 5 is an insulating resin film, 6 is a seal portion, and 7 is an electrode plate lead.

非水電解質電池１は、正極板と負極板とをセパレータを介して積層した積層電極群（図示省略）と電解液を、金属箔を含む多層フィルムからなる封入体２に収納し、図１（Ａ）に示すように、正極板に接続したタブリード３、負極板に接続したタブリード３’を、絶縁樹脂フィルム５を介して封入体２のシール部６から密封封止した状態で取り出して構成される。封入体２に用いる多層フィルムは、後述するように、少なくとも金属箔の両面に樹脂フィルムを貼り合わせて形成される。   The nonaqueous electrolyte battery 1 accommodates a laminated electrode group (not shown) in which a positive electrode plate and a negative electrode plate are laminated via a separator, and an electrolytic solution in an enclosure 2 made of a multilayer film including a metal foil. As shown in A), the tab lead 3 connected to the positive electrode plate and the tab lead 3 'connected to the negative electrode plate are taken out in a state of being hermetically sealed from the seal portion 6 of the enclosure 2 via the insulating resin film 5. The The multilayer film used for the enclosure 2 is formed by bonding resin films on at least both surfaces of the metal foil, as will be described later.

封入体２は、非水電解質電池１の外装ケースとなるもので、例えば、矩形状の２枚の多層フィルム周辺のシール部６を、熱溶着によりシールすることにより密封される。タブリード３，３’には、絶縁樹脂フィルム５が予め熱溶着により接合されている。この絶縁樹脂フィルム５と封入体２の多層フィルムとが熱融着されてタブリード３，３’と多層フィルムとが密封される。   The enclosure 2 serves as an outer case of the non-aqueous electrolyte battery 1 and is sealed by, for example, sealing the sealing portions 6 around the two rectangular multilayer films by heat welding. An insulating resin film 5 is previously bonded to the tab leads 3 and 3 'by heat welding. The insulating resin film 5 and the multilayer film of the enclosure 2 are heat-sealed to seal the tab leads 3, 3 'and the multilayer film.

タブリード３，３’は、薄い導体箔を長方形状にカットして平形導体４とし、この平形導体の封入体２からの取り出し部分に絶縁樹脂フィルム５を貼り付けて構成される。絶縁樹脂フィルム５は、平形導体４の両面に位置を合わせて貼り合わされる。この絶縁樹脂フィルム５は、長方形状の平形導体４の長さ（縦方向）より短く、平形導体４の幅（横方向）より広いものが用いられる。   The tab leads 3 and 3 ′ are formed by cutting a thin conductor foil into a rectangular shape to form a flat conductor 4, and attaching an insulating resin film 5 to a portion where the flat conductor is taken out from the enclosure 2. The insulating resin film 5 is bonded to both sides of the flat conductor 4 so as to be aligned. The insulating resin film 5 is shorter than the length (vertical direction) of the rectangular flat conductor 4 and wider than the width (lateral direction) of the flat conductor 4.

なお、非水電解質電池１として、携帯電話、ノートパソコン、携帯音楽プレーヤ等の機器に搭載される小型のものと、電気自動車用のバッテリー等の大型のものがある。タブリードの平形導体４は、上記の電池の形状や容量により異なるが、厚さが０.０５ｍｍ〜０.５ｍｍ、好ましくは０．０８ｍｍ〜０．５ｍｍ、長さ（縦方向）が２０ｍｍ〜８０ｍｍ、幅（横方向）が２ｍｍ〜９０ｍｍで、縦方向の長さより横幅の方が大きい場合もある。絶縁樹脂フィルム５は、長さ（縦方向）が３ｍｍ〜１０ｍｍ、横幅は平形導体４の幅より数ｍｍ大きいものが用いられる。   The nonaqueous electrolyte battery 1 includes a small battery mounted on a device such as a mobile phone, a notebook computer, and a portable music player, and a large battery such as a battery for an electric vehicle. The flat conductor 4 of the tab lead varies depending on the shape and capacity of the battery, but has a thickness of 0.05 mm to 0.5 mm, preferably 0.08 mm to 0.5 mm, and a length (vertical direction) of 20 mm to 80 mm. The width (horizontal direction) is 2 mm to 90 mm, and the horizontal width may be larger than the length in the vertical direction. The insulating resin film 5 has a length (longitudinal direction) of 3 mm to 10 mm and a width that is several mm larger than the width of the flat conductor 4.

絶縁樹脂フィルム５は、図１（Ｂ）および図２に示すように、タブリード３，３’の平形導体４の両面に、接着または溶着する内側層５ａと封入体２と融着される外側層５ｂの２層で形成することができる。内側層５ａは、予め加熱溶融により平形導体４に密着させて、導体界面における良好な密封封止を形成しておく。外側層５ｂは、内側層５ａの融点より高い融点のものが用いられ、平形導体４との密封封止時には溶融が生じないようにして形状を保持する。そして、封入体２とのシール時に、外側層５ｂと封入体２と融着させることで、封入体２内の金属箔２ｂと平形導体４が電気的に短絡しないようにすることができる。   As shown in FIG. 1B and FIG. 2, the insulating resin film 5 has an inner layer 5 a that adheres or welds to both sides of the flat conductor 4 of the tab leads 3, 3 ′ and an outer layer that is fused to the encapsulant 2. It can be formed with two layers of 5b. The inner layer 5a is brought into close contact with the flat conductor 4 by heating and melting in advance to form a good hermetic seal at the conductor interface. The outer layer 5b has a melting point higher than that of the inner layer 5a. The outer layer 5b retains its shape so as not to melt when sealed with the flat conductor 4. And when sealing with the enclosure 2, the outer layer 5 b and the enclosure 2 are fused to prevent the metal foil 2 b and the flat conductor 4 in the enclosure 2 from being electrically short-circuited.

タブリード３，３’は、平形導体４の縦方向の両端を除く部分（中間部分）に、絶縁樹脂フィルム５をその幅方向の両端から外方に多少はみ出るようにして貼り合わせて覆い、平形導体４の上端部４ａと下端部４ｂとを露出させて構成される。そして、上端部４ａは、封入体２から外側に露出され外部装置等への接続端子とされ、下端部４ｂは、封入体２内で電池の電極板リード７との接続部とされる。   The tab leads 3 and 3 ′ cover the flat conductor 4 except for both ends in the vertical direction (intermediate portion) by covering the insulating resin film 5 so as to slightly protrude outward from both ends in the width direction. 4, the upper end 4a and the lower end 4b are exposed. The upper end portion 4a is exposed to the outside from the enclosure 2 and serves as a connection terminal to an external device or the like, and the lower end portion 4b is a connection portion with the electrode plate lead 7 of the battery in the enclosure 2.

封入体２を形成する多層フィルムは、少なくとも３層の積層体からなり、その最内層フィルム２ａは、電解液で溶解されずシール部６から電解液が漏出するのを防止するのに適したものとしてポリオレフィン樹脂（例：無水マレイン酸変性低密度ポリエチレンまたはポリプロピレン）が用いられる。金属箔層２ｂは、アルミニウム、銅、ステンレス等の金属箔が用いられ、電解液に対する密封性を高めている。最外層フィルム２ｃは、薄い金属箔層２ｂを保護するためのもので、ポリエチレンテレフタレート（ＰＥＴ）等で形成されている。   The multilayer film forming the encapsulant 2 is composed of a laminate of at least three layers, and the innermost layer film 2a is suitable for preventing the electrolyte from leaking from the seal portion 6 without being dissolved by the electrolyte. A polyolefin resin (eg, maleic anhydride-modified low density polyethylene or polypropylene) is used. The metal foil layer 2b is made of a metal foil such as aluminum, copper, or stainless steel, and enhances the sealing performance against the electrolytic solution. The outermost layer film 2c is for protecting the thin metal foil layer 2b, and is formed of polyethylene terephthalate (PET) or the like.

正極側のタブリード３の平形導体４は、高い電位がかかるため高電位で電解液に溶解しない金属材で、アルミニウムから形成される。なお、負極側のタブリード３’の平形導体４には、通常、銅またはニッケル、またはこれらの合金またはアルミニウムが用いられる。   The flat conductor 4 of the tab lead 3 on the positive electrode side is made of aluminum, which is a metal material that does not dissolve in the electrolytic solution at a high potential because a high potential is applied. The flat conductor 4 of the tab lead 3 ′ on the negative electrode side is usually made of copper or nickel, or an alloy or aluminum thereof.

アルミニウム箔からなるタブリード３は、絶縁樹脂フィルム５で封入体２に封止固定され、下端部４ｂが封入体２内の電極板リード７に溶接等で接続固定されて電池内に組み付けられる。この状態で、電池が落下等により衝撃を受けると、封入体２による封止固定部分と電極板リード７との接続固定部分との間で、平形導体４に引張応力が生じて下端部４ｂで破断することがある。   The tab lead 3 made of aluminum foil is sealed and fixed to the encapsulant 2 with an insulating resin film 5, and the lower end portion 4b is connected and fixed to the electrode plate lead 7 in the encapsulant 2 by welding or the like and assembled in the battery. In this state, when the battery receives an impact due to dropping or the like, a tensile stress is generated in the flat conductor 4 between the sealing and fixing portion of the encapsulant 2 and the connection and fixing portion of the electrode plate lead 7, and the lower end portion 4b. May break.

本発明は、特に、上記のアルミニウム箔導体を用いたタブリード３を、従来のものより抗張力を高め、かつ破断伸びを大きくしたことを特徴としている。
本発明のタブリードに使用されるアルミニウム箔は、それ自体の抗張力が９０Ｎ／ｍｍ２以上である。抵張力が大きいほど良いが、現実的には１１０Ｎ／ｍｍ２以上あれば十分である。アルミニウム箔自体の破断伸びは３０％以上である。破断伸びは大きいほど良いが、現実的には５０％あれば十分である。
アルミニウム箔に絶縁フィルムを貼るときにはアルミニウム箔に熱が加えられるので、絶縁フィルムを貼った後のアルミニウム箔の抗張力と破断伸びは、アルミニウム箔自体の抗張力と破断伸びよりも小さくなる。絶縁フィルムを貼った後のアルミニウム箔の抗張力は８５Ｎ／ｍｍ２以上あればよい。現実的には、例えば、絶縁フィルムを貼った後のアルミニウム箔の抗張力は１１０Ｎ／ｍｍ２あれば好ましい。絶縁フィルムを貼った後のアルミニウム箔の破断伸びは１５％以上あればよい。現実的には、例えば、絶縁フィルムを貼った後のアルミニウム箔の破断伸びは４０％あれば好ましい。 The present invention is particularly characterized in that the tab lead 3 using the above aluminum foil conductor has higher tensile strength and larger elongation at break than the conventional one.
The aluminum foil used for the tab lead of the present invention has a tensile strength of 90 N / mm 2 or more. A higher resistance is better, but in reality, 110 N / mm 2 or more is sufficient. The breaking elongation of the aluminum foil itself is 30% or more. The larger the elongation at break, the better, but in reality 50% is sufficient.
Since heat is applied to the aluminum foil when the insulating film is applied to the aluminum foil, the tensile strength and breaking elongation of the aluminum foil after the insulating film is applied are smaller than the tensile strength and breaking elongation of the aluminum foil itself. The tensile strength of the aluminum foil after the insulating film is pasted may be 85 N / mm 2 or more. Actually, for example, it is preferable that the tensile strength of the aluminum foil after the insulating film is applied is 110 N / mm 2 . The breaking elongation of the aluminum foil after pasting the insulating film may be 15% or more. Actually, for example, the elongation at break of the aluminum foil after the insulating film is pasted is preferably 40%.

本発明においては、例えば、アルミニウム箔に含まれる鉄の含有量を、従来の０.７重量％以下より多い１.２〜１.７重量％とした。厚さ０．１ｍｍのアルミニウム箔の抗張力、破断伸びを表１に示す。アルミニウム箔の抗張力を従来（比較例１）の７５Ｎ／ｍｍ２から９０Ｎ／ｍｍ２〜１００Ｎ／ｍｍ２に高めることができた。また、破断伸びは、従来（比較例１）の２５％から３０％〜４０％に高めることができた。このアルミニウム箔に絶縁フィルムを貼り付けたタブリードを電池に組み込んで落下試験（５０００回；試験方法 落下高さ１ｍ、床の材質堅木）を行うと、実施例１，２のタブリードの破断はしないが、従来例（比較例１）では破断する。
厚さ０．０５ｍｍのアルミニウム箔を平形導体４として絶縁樹脂フィルム５を貼り付けたタブリード３とした状態で平型導体４の抗張力、破断伸びを測定した。表２にその値を示す。抗張力は、従来の７０Ｎ／ｍｍ２から８５〜９０Ｎ／ｍｍ２と高めることができた。破断伸びは、従来の１０％から１５〜２０％に高めることができた。上記と同様に落下試験をすると、実施例３、４のタブリードは破断しないが、従来例（比較例２）では破断する。
このように、本発明によれば、５０００回の落下試験（１ｍの高さから落下）でもタブリードに破断が生じず、タブリードの破断強度を向上させられることが確認できた。このため、本発明によれば、衝撃により破断の生じにくいアルミニウム箔からなるタブリードとこれを用いた電池を提供することができる。 In the present invention, for example, the content of iron contained in the aluminum foil is set to 1.2 to 1.7% by weight, which is higher than the conventional 0.7% by weight or less. Table 1 shows the tensile strength and elongation at break of an aluminum foil having a thickness of 0.1 mm. It was able to increase the tensile strength of the aluminum foil from 75N / mm 2 of conventional (Comparative Example 1) 90N / mm 2 ~100N / mm 2 . In addition, the elongation at break could be increased from 25% in the prior art (Comparative Example 1) to 30% to 40%. When the tab lead with the insulating film attached to the aluminum foil is incorporated in the battery and subjected to a drop test (5000 times; test method, drop height 1 m, floor material hardwood), the tab leads of Examples 1 and 2 are not broken. However, the conventional example (Comparative Example 1) breaks.
With the aluminum foil having a thickness of 0.05 mm as the flat conductor 4 and the tab lead 3 with the insulating resin film 5 attached, the tensile strength and breaking elongation of the flat conductor 4 were measured. Table 2 shows the values. Tensile strength could be increased from conventional 70N / mm 2 and 85~90N / mm 2. The elongation at break could be increased from the conventional 10% to 15-20%. When the drop test is performed in the same manner as described above, the tab leads of Examples 3 and 4 are not broken, but are broken in the conventional example (Comparative Example 2).
Thus, according to the present invention, it was confirmed that the tab lead was not broken even after 5000 times of drop test (dropped from a height of 1 m), and the breaking strength of the tab lead could be improved. For this reason, according to the present invention, it is possible to provide a tab lead made of an aluminum foil which is not easily broken by an impact, and a battery using the tab lead.

Figure 0005673749
Figure 0005673749

Figure 0005673749
Figure 0005673749

１…非水電解質電池、２…封入体、２ａ…最内層フィルム、２ｂ…金属箔層、２ｃ…最外層フィルム、３…正極側のタブリード、３’…負極側のタブリード、４…平形導体、５…絶縁樹脂フィルム、６…シール部、７…電極板リード。 DESCRIPTION OF SYMBOLS 1 ... Nonaqueous electrolyte battery, 2 ... Inclusion body, 2a ... Innermost layer film, 2b ... Metal foil layer, 2c ... Outermost layer film, 3 ... Tab lead on the positive electrode side, 3 '... Tab lead on the negative electrode side, 4 ... Flat conductor, 5 ... insulating resin film, 6 ... seal part, 7 ... electrode plate lead.

Claims (6)

耐電解液性を付与する表面処理が施されたアルミニウム箔からなる長方形状の平形導体の両面から、該平形導体の縦方向の両端側が露出され幅方向の両端の一部を覆って外方にはみ出るように、絶縁樹脂フィルムが貼り合わされたタブリードであって、
前記絶縁樹脂フィルムを貼った後の前記アルミニウム箔の抗張力が、８５Ｎ／ｍｍ２以上であり、
前記アルミニウム箔は、鉄が１.２〜１.７重量％含まれていることを特徴とするタブリード。 From both sides of a rectangular flat conductor made of aluminum foil that has been subjected to a surface treatment that imparts electrolyte resistance, both ends in the vertical direction of the flat conductor are exposed and partially covered at both ends in the width direction. It is a tab lead with an insulating resin film bonded so as to protrude,
The tensile strength of the aluminum foil after applying the insulating resin film, Ri 85N / mm 2 or more der,
The aluminum foil contains 1.2 to 1.7% by weight of iron and is a tab lead. 前記絶縁樹脂フィルムを貼った後の前記アルミニウム箔の破断伸びが、１５％以上であることを特徴とする請求項１に記載のタブリード。   The tab lead according to claim 1, wherein the elongation at break of the aluminum foil after the insulating resin film is pasted is 15% or more. 前記アルミニウム箔の抗張力が、９０Ｎ／ｍｍ２以上であることを特徴とする請求項１または２に記載のタブリード。 The tab lead according to claim 1 or 2, wherein the tensile strength of the aluminum foil is 90 N / mm 2 or more. 前記アルミニウム箔の破断伸びが、３０％以上であることを特徴とする請求項１から３のいずれか一項に記載のタブリード。   The tab lead according to any one of claims 1 to 3, wherein the breaking elongation of the aluminum foil is 30% or more. 前記アルミニウム箔の厚さが０.０５ｍｍ〜０.５ｍｍであることを特徴とする請求項１から４のいずれか一項に記載のタブリード。The tab lead according to any one of claims 1 to 4, wherein the aluminum foil has a thickness of 0.05 mm to 0.5 mm. 正極板と負極板とをセパレータを介して積層した積層電極群と電解液を、金属箔を含む多層フィルムからなる封入体に収納した電池であって、A battery in which a laminated electrode group obtained by laminating a positive electrode plate and a negative electrode plate via a separator and an electrolytic solution are housed in an enclosure made of a multilayer film containing a metal foil,
請求項１から５のいずれか一項に記載のタブリードを前記正極板または前記負極板に接続して前記封入体から取り出し、前記タブリードが前記封入体と接する箇所が密閉されていることを特徴とする電池。  The tab lead according to any one of claims 1 to 5, wherein the tab lead is connected to the positive electrode plate or the negative electrode plate and taken out from the enclosure, and a portion where the tab lead contacts the enclosure is sealed. Battery to play.
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