JP4609432B2 - Lead terminal for power storage device with fuse and non-aqueous electrolyte power storage device - Google Patents

Lead terminal for power storage device with fuse and non-aqueous electrolyte power storage device Download PDF

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JP4609432B2
JP4609432B2 JP2007010142A JP2007010142A JP4609432B2 JP 4609432 B2 JP4609432 B2 JP 4609432B2 JP 2007010142 A JP2007010142 A JP 2007010142A JP 2007010142 A JP2007010142 A JP 2007010142A JP 4609432 B2 JP4609432 B2 JP 4609432B2
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storage device
fuse
lead terminal
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JP2008177084A (en
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浩介 田中
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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

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Description

本発明は、ヒューズ付き蓄電デバイス用リード端子、及びそれを備えた非水電解質蓄電デバイスに関する。   The present invention relates to a lead terminal for an electricity storage device with a fuse and a nonaqueous electrolyte electricity storage device including the lead terminal.

従来からリチウムイオン２次電池等の非水電解質電池が、様々な電子機器の電源として用いられている。例えば、特許文献１には、正極、負極、電解液が軽量、薄肉の袋に収納され、正極と負極のリード線をそれぞれ外部に取り出す構造を有する非水電解質電池が開示されている。また、特許文献２，３には、非水電解質電池における電極と外部との接続に用いられるリード線について開示されている。   Conventionally, nonaqueous electrolyte batteries such as lithium ion secondary batteries have been used as power sources for various electronic devices. For example, Patent Document 1 discloses a nonaqueous electrolyte battery having a structure in which a positive electrode, a negative electrode, and an electrolytic solution are housed in a lightweight, thin bag and lead wires of the positive electrode and the negative electrode are respectively taken out to the outside. Patent Documents 2 and 3 disclose lead wires used for connection between an electrode and the outside in a nonaqueous electrolyte battery.

従来の非水電解質電池は、過充電・過放電や内部短絡などの異常が発生した際に、熱暴走を起こし、最悪のケースでは発火に至る恐れがある。この問題に対処するために、電池を搭載した電子機器内の回路分岐毎に保護回路を設けたり、電池そのものに安全機構を設けることがなされている。   Conventional non-aqueous electrolyte batteries may cause thermal runaway when abnormalities such as overcharge / overdischarge and internal short circuit occur, and may cause fire in the worst case. In order to cope with this problem, a protection circuit is provided for each circuit branch in an electronic device equipped with a battery, or a safety mechanism is provided on the battery itself.

電池の安全機構の一例として、金属リード片の間に橋渡したヒューズ素子（可溶体）を絶縁フィルムで被覆する技術が開示されている（例えば、特許文献４を参照）。しかしながら、絶縁フィルムによっては、ヒューズ素子の溶断時には金属が非常に高温となり絶縁フィルムが熱収縮してしまう可能性がある。また、熱収縮が生じると溶断されたヒューズ素子同士が再び短絡してしまう可能性もある。   As an example of a battery safety mechanism, a technique is disclosed in which a fuse element (soluble body) bridged between metal lead pieces is covered with an insulating film (see, for example, Patent Document 4). However, depending on the insulating film, when the fuse element is melted, the metal becomes very hot and the insulating film may be thermally contracted. Further, when thermal contraction occurs, the blown fuse elements may be short-circuited again.

このような熱収縮を防止するために、補強部材を入れる技術も開示されている（例えば、特許文献５を参照）。
特開平９−２６５９７４号公報 特開平９−２８３１０１号公報 特開２００６−２５２８０２号公報 意匠登録第１０５７５９６号公報 特開平１１−６７１９０号公報 In order to prevent such heat shrinkage, a technique for inserting a reinforcing member is also disclosed (see, for example, Patent Document 5).
JP-A-9-265974 JP-A-9-283101 JP 2006-252802 A Design Registration No. 1057596 JP-A-11-67190

上述のごとく、従来のリード端子は、被覆樹脂が溶断時の熱で熱収縮してしまうため、溶断後に再短絡してしまう恐れがあり、一方で、それを防ぐために特許文献５のごとく補強部材を入れると、部品点数が増え、構造が複雑となる。また、電池の安全機構として低融点金属のヒューズ素子を用いた場合には、電池の組立工程において外装ケースの熱シール時に溶断してしまう恐れもある。   As described above, the conventional lead terminal is thermally contracted by the heat at the time of fusing, and thus may be short-circuited again after fusing. On the other hand, in order to prevent this, the reinforcing member is as in Patent Document 5. If it is inserted, the number of parts increases and the structure becomes complicated. Further, when a low-melting-point metal fuse element is used as a battery safety mechanism, the battery may be blown when the outer case is heat sealed in the battery assembly process.

本発明は、上述のごとき実情に鑑みてなされたものであり、部品点数を増やすことなく、ヒューズ部が溶断しても、溶断後に絶縁フィルムが変形し溶断部が再短絡することのないヒューズ付き蓄電デバイス用リード端子を提供すること、並びにそれを備えた非水電解質蓄電デバイスを提供することを目的とする。   The present invention has been made in view of the above-described circumstances, and with a fuse that does not increase the number of parts, and even if the fuse part is melted, the insulating film is deformed after the melting and the melted part is not short-circuited again. An object of the present invention is to provide a lead terminal for an electricity storage device, and to provide a nonaqueous electrolyte electricity storage device including the lead terminal.

本発明による蓄電デバイス用リード端子は、第一リード部、第二リード部、第一リード部と第二リード部の間を橋渡しするヒューズ部と、第一リード部の一部及び第二リード部の一部と共にヒューズ部を被覆する樹脂フィルムとを有する帯状の蓄電デバイス用リード端子であって、このリード端子における樹脂フィルムに覆われた領域は、このリード端子の幅方向で見て、第一リード部からなる第一領域と、第二リード部からなる第二領域と、第一リード部と第二リード部とからなる中間領域と、を含むことを特徴としたものである。   A lead terminal for an electricity storage device according to the present invention includes a first lead part, a second lead part, a fuse part that bridges between the first lead part and the second lead part, a part of the first lead part, and a second lead part A belt-shaped lead terminal for an electricity storage device having a resin film covering the fuse portion together with a part of the lead terminal, and the region covered with the resin film in the lead terminal is first viewed in the width direction of the lead terminal. It includes a first region composed of a lead portion, a second region composed of a second lead portion, and an intermediate region composed of a first lead portion and a second lead portion.

本発明による非水電解質蓄電デバイスは、上述の蓄電デバイス用リード端子を備え、正極、負極、電解質が外包体に収納された非水電解質蓄電デバイスであって、このリード端子は、正極及び／又は負極に接続され、外包体の外に少なくとも第一リード部の非被覆部分又は第二リード部の非被覆部分を出した状態で、外包体の封入口に樹脂フィルム部分でシールされ取り付けられていることを特徴としたものである。   A non-aqueous electrolyte electricity storage device according to the present invention is a non-aqueous electrolyte electricity storage device that includes the above-described lead terminal for an electricity storage device, and includes a positive electrode, a negative electrode, and an electrolyte contained in an outer package. It is connected to the negative electrode, and is sealed and attached to the encapsulating port of the outer packaging body with a resin film portion with at least the uncovered portion of the first lead portion or the uncovered portion of the second lead portion outside the outer packaging body. It is characterized by that.

本発明の蓄電デバイス用リード端子によれば、部品点数を増やすことなく、ヒューズ部が溶断しても、溶断後に絶縁フィルムが変形し溶断部が再短絡することがなくなる。また、本発明の非水電解質蓄電デバイスによれば、このリード端子を取り付けることで、ヒューズ部が溶断しても、溶断後に絶縁フィルムが変形し溶断部が再短絡することがなくなる。   According to the lead terminal for an electricity storage device of the present invention, even if the fuse part is melted without increasing the number of parts, the insulating film is not deformed after the melting and the melted part is not short-circuited again. Moreover, according to the nonaqueous electrolyte electricity storage device of the present invention, by attaching this lead terminal, even if the fuse part is melted, the insulating film is not deformed after the melting and the melted part is not short-circuited again.

図１は、本発明の一実施形態に係る非水電解質蓄電デバイスの構成例を示す斜視図で、図中、１は非水電解質蓄電デバイスの一例としての非水電解質電池である。なお、蓄電デバイスとしては、電池に限ったものではなく、コンデンサのように電荷を蓄えるものであれば適用できる。非水電解質電池１は、電解質、積層電極群２、正極リード３、負極リード４、樹脂フィルム（樹脂シート）５，６、並びに外包体としての外装ケース７を備える。   FIG. 1 is a perspective view showing a configuration example of a nonaqueous electrolyte electricity storage device according to an embodiment of the present invention. In the figure, 1 is a nonaqueous electrolyte battery as an example of a nonaqueous electrolyte electricity storage device. In addition, as an electrical storage device, it is not restricted to a battery, It is applicable if it can store an electric charge like a capacitor | condenser. The nonaqueous electrolyte battery 1 includes an electrolyte, a laminated electrode group 2, a positive electrode lead 3, a negative electrode lead 4, resin films (resin sheets) 5 and 6, and an outer case 7 as an outer package.

外装ケース７としては、例えばラミネートシートを袋状にして用いるとよい。こ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に樹脂フィルムを貼り合わせるなどして、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ため、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。   As the outer case 7, for example, a laminate sheet may be used in a bag shape. This laminate sheet is formed, for example, as a laminate of 3 to 5 layers by bonding resin films on both sides of a metal foil made of metal such as aluminum, copper, and stainless steel. The innermost layer film is formed of, for example, an acid-modified polyolefin (eg, maleic anhydride-modified low-density polyethylene) in order to prevent 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７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など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 accommodated in the outer case 7 include organic solvents such as propylene carbonate, ethylene carbonate, diethyl carbonate, dimethyl carbonate, 1,2-dimethoxyethane, and tetrahydrodofuran, LiClO 4 , LiBF 4 , LiPF 6 , and LiAsF. A nonaqueous electrolytic solution in which 6 or the like is dissolved, a lithium ion conductive solid electrolyte, or the like is used.

積層電極群２は、正極板、負極板をセパレータを介して積層したものである。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。また、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などで形成される。   The laminated electrode group 2 is obtained by laminating a positive electrode plate and a negative electrode plate via a separator. 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 is formed of a polyolefin-based porous film that retains electrical insulation and also retains ionic conductivity.

正極リード３、負極リード４は、少なくとも一方がヒューズ付きの帯状導体であり、それぞれ正の電極板、負の電極板にスポット溶接や超音波溶接等により接続される。正極リード３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、負極リード４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難く、リチウムと合金が形成され難く、且つ、高電位で溶解され難いように、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。   At least one of the positive electrode lead 3 and the negative electrode lead 4 is a belt-like conductor with a fuse, and is connected to the positive electrode plate and the negative electrode plate, respectively, by spot welding or ultrasonic welding. Since the positive electrode lead 3 has a positive high potential, the positive electrode lead 3 is preferably formed 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 electrolytic solution. The negative electrode lead 4 is negatively charged so that lithium is deposited by overcharge and the potential becomes high by overdischarge. Therefore, the negative electrode lead 4 is hardly corroded by lithium, hardly forms an alloy with lithium, and is not easily dissolved at high potential. It is preferable that the electrode conductor is formed of the same copper, nickel, or an alloy thereof.

樹脂フィルム５，６は、それぞれ正極リード３、負極リード４に予め熱溶着や接着などによって接合される。なお、正極リード３及び負極リード４の少なくともいずれか一方の形状や樹脂フィルム５，６の被覆領域などについては、本発明の主たる特徴部分であり詳細に後述する。樹脂フィルム５，６でそれぞれ被覆された正極リード３、負極リード４は、外装ケース７のシール部８に挟み込まれ熱シールされて封止される。   The resin films 5 and 6 are bonded to the positive electrode lead 3 and the negative electrode lead 4 in advance by heat welding or adhesion, respectively. Note that the shape of at least one of the positive electrode lead 3 and the negative electrode lead 4 and the covering region of the resin films 5 and 6 are the main features of the present invention and will be described in detail later. The positive electrode lead 3 and the negative electrode lead 4 respectively coated with the resin films 5 and 6 are sandwiched between the seal portions 8 of the outer case 7 and heat sealed to be sealed.

樹脂フィルム５，６の接合位置は、外装ケース７のシール部８からの取出し部分に相当する位置とする。また、樹脂フィルム５，６は、外装ケース７（ラミネートシートの金属箔）と電気的短絡が生じないようにして密封状態で引き出しておく。このため、樹脂フィルム５，６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７のシール部８の熱シール温度では溶融しない外側絶縁層の２層で形成することが好ましい。   The joining position of the resin films 5 and 6 is set to a position corresponding to a part taken out from the seal portion 8 of the outer case 7. The resin films 5 and 6 are drawn out in a sealed state so as not to cause an electrical short circuit with the outer case 7 (metal foil of the laminate sheet). For this reason, the resin films 5 and 6 are preferably 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 and does not melt at the heat sealing temperature of the seal portion 8 of the outer case 7. .

この内側絶縁層には、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、正極リード３及び負極リード４の金属面に熱溶着される。一方、外側絶縁層には、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７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８は１５０℃程度で熱シールされることとなるが、例示した外側絶縁層は、この熱シール温度で溶融されることはない。従って、このような外側絶縁層を採用することで、正極リード３及び負極リード４の取り出し部分において、外装ケース７の金属箔との電気的絶縁を確保することができる。   For this inner insulating layer, 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 surfaces of the positive electrode lead 3 and the negative electrode lead 4. On the other hand, for the outer insulating layer, for example, a crosslinked polyolefin resin, preferably a crosslinked low density polyethylene, ethylene-vinyl alcohol polymer, or polypropylene is used. When the innermost layer film of the outer case 7 is formed of acid-modified low-density polyethylene, the seal portion 8 is heat-sealed at about 150 ° C., but the illustrated outer insulating layer is melted at this heat-sealing temperature. It will never be done. Therefore, by adopting such an outer insulating layer, electrical insulation from the metal foil of the outer case 7 can be ensured at the portion where the positive electrode lead 3 and the negative electrode lead 4 are taken out.

このように、非水電解質電池１は、積層電極群２と電解質を外装ケース７に収納し、正極板に接続した正極リード３及び負極板に接続した負極リード４を樹脂フィルム５，６で被覆したものを、シール部８から外部に取り出した状態でシール部８にて熱シールし、これにより内部を密封状態にして構成される。   As described above, the nonaqueous electrolyte battery 1 has the laminated electrode group 2 and the electrolyte accommodated in the outer case 7, and the positive electrode lead 3 connected to the positive electrode plate and the negative electrode lead 4 connected to the negative electrode plate are covered with the resin films 5 and 6. The product is heat-sealed at the seal portion 8 in a state where it is taken out from the seal portion 8, and the inside is thereby sealed.

図２は、図１のデバイスに使用されるリード端子の構成例を示す上面図で、リード端子の形状や被覆領域の例を説明するための図である。図２は、本発明の一実施形態に係るヒューズ付きリード端子の構成例を示す上面図でもある。以下、正極リード３のみが本発明に係るヒューズ付きリード端子であり、負極リード４側はヒューズ部１０を備えない矩形の帯状導体である場合についてのみ説明する。   FIG. 2 is a top view showing a configuration example of a lead terminal used in the device of FIG. 1, and is a diagram for explaining an example of the shape of the lead terminal and a covering region. FIG. 2 is also a top view illustrating a configuration example of a lead terminal with a fuse according to an embodiment of the present invention. Hereinafter, only the case where the positive electrode lead 3 is a lead terminal with a fuse according to the present invention and the negative electrode lead 4 side is a rectangular strip conductor without the fuse portion 10 will be described.

図２（Ａ）〜（Ｃ）でそれぞれ例示する帯状のリード端子は、図１の非水電解質電池１における樹脂フィルム５で被覆後の正極リード３に相当するものである。図２（Ａ）で例示する正極リード３は、第一リード部１１ａ、第二リード部１２ａ、及び第一リード部１１ａと第二リード部１２ａの間を橋渡しするヒューズ部１０を備える。   2A to 2C respectively correspond to the positive electrode lead 3 after being covered with the resin film 5 in the nonaqueous electrolyte battery 1 of FIG. The positive lead 3 illustrated in FIG. 2A includes a first lead portion 11a, a second lead portion 12a, and a fuse portion 10 that bridges between the first lead portion 11a and the second lead portion 12a.

ヒューズ部１０は、（１）第一リード部１１ａ及び第二リード部１２ａに対して部分的に断面積を小さくする、（２）第一リード部１１ａと第二リード部１２ａとは異種金属とし、それらを接合しその部分の抵抗値を高くする、（３）融点の低い金属を接合する、などによってそのヒューズ機能を果たすように構成すればよい。特に上記（１），（２）のように、ヒューズ部１０は過電流によって溶断することが好ましい。ヒューズ部１０を電流溶断とすることで、外装ケース７の熱シール時など電池組立時の熱による溶断を防止することができる。   The fuse portion 10 is (1) partially reduced in cross-sectional area with respect to the first lead portion 11a and the second lead portion 12a. (2) The first lead portion 11a and the second lead portion 12a are made of different metals. The fuse function may be achieved by joining them to increase the resistance value of the portion, (3) joining a metal having a low melting point, or the like. In particular, as in the above (1) and (2), the fuse portion 10 is preferably blown by overcurrent. By setting the fuse portion 10 to current blowing, it is possible to prevent the fuse case 10 from being melted by heat during battery assembly, such as when the outer case 7 is heat sealed.

また、図２（Ａ）で例示する樹脂フィルム５は、第一リード部１１ａの一部及び第二リード部１２ａの一部と共にヒューズ部１０を被覆する。特に上記（１），（２）でヒューズ部１０を構成した場合、ヒューズ部１０が溶断した際のスパークで発火延焼することを防止するために、樹脂フィルム５は少なくともヒューズ部１０を覆う部分で難燃性であることが好ましい。ここで、樹脂フィルム５を２層構造とする場合には、内側絶縁層だけでなく外側絶縁層も難燃性とすることが好ましい。樹脂フィルム５を難燃性とするためには、水酸化マグネシウム等の各種難燃剤を例示した樹脂に添加するか接着層として用いるなどすればよい。   Moreover, the resin film 5 illustrated in FIG. 2A covers the fuse part 10 together with a part of the first lead part 11a and a part of the second lead part 12a. In particular, when the fuse part 10 is constituted by the above (1) and (2), the resin film 5 is at least a part covering the fuse part 10 in order to prevent ignition and spreading by sparks when the fuse part 10 is blown. It is preferably flame retardant. Here, when the resin film 5 has a two-layer structure, it is preferable that not only the inner insulating layer but also the outer insulating layer be flame retardant. In order to make the resin film 5 flame retardant, various flame retardants such as magnesium hydroxide may be added to the exemplified resin or used as an adhesive layer.

図２（Ａ）に示すように、正極リード３は、樹脂フィルム５に覆われた領域を、このリード端子の幅方向（正極リード３の幅方向）で見て、第一領域Ｉ、第二領域ＩＩ、中間領域Ｍ、及びヒューズ領域Ｈに分類できるような平面形状とする。   As shown in FIG. 2A, the positive electrode lead 3 has a first region I and a second region when the region covered with the resin film 5 is viewed in the width direction of the lead terminal (the width direction of the positive electrode lead 3). The planar shape can be classified into the region II, the intermediate region M, and the fuse region H.

ここで、例えば、第一領域Ｉは幅方向に第一リード部１１ａのみでなり、第二領域ＩＩは幅方向に第二リード部１２ａのみでなり、中間領域Ｍは幅方向に第一リード部１１ａ及び第二リード部１２ａでなる。また、ヒューズ領域Ｈは、幅方向に、ヒューズ部１０および第一リード部１１ａを含む構成とすることができる。なお、中間領域Ｍやヒューズ領域Ｈにおいて、各部の並び順は問わない。   Here, for example, the first region I includes only the first lead portion 11a in the width direction, the second region II includes only the second lead portion 12a in the width direction, and the intermediate region M includes the first lead portion in the width direction. 11a and the second lead portion 12a. The fuse region H can be configured to include the fuse portion 10 and the first lead portion 11a in the width direction. In the intermediate region M and the fuse region H, the arrangement order of each part is not limited.

換言すると、正極リード３における樹脂フィルム５で覆われた部分は、領域Ｉ，ＩＩ，Ｍ，Ｈでなるような平面形状をもっている。より具体的には、図２（Ａ）で例示した平面形状は、第一リード部１１ａが凹形状、第二リード部１２ａが凸形状であり、凹形状の底部分と凸形状の頂点部分との間にヒューズ部１０が橋渡しされている。   In other words, the portion of the positive electrode lead 3 covered with the resin film 5 has a planar shape composed of the regions I, II, M, and H. More specifically, in the planar shape illustrated in FIG. 2A, the first lead portion 11a has a concave shape, the second lead portion 12a has a convex shape, a concave bottom portion, and a convex vertex portion. The fuse portion 10 is bridged between the two.

図２（Ｂ）で例示した第一リード部１１ｂ及び第二リード部１２ｂも図２（Ａ）と同様の平面形状をしており、凹凸の幅方向位置とヒューズ部１０の位置が異なるだけである。但し、この差異により、図２（Ｂ）の例では中間領域Ｍが２箇所存在する。また、図２（Ｃ）で例示した第一リード部１１ｃ及び第二リード部１２ｃは、図２（Ａ），（Ｂ）での凹凸形状に代わり、それぞれＬ字状の平面形状をもつ。第一リード部１１ｃと第二リード部１２ｃとはヒューズ部１０により橋渡しされており、中間領域Ｍは２箇所存在する。   The first lead portion 11b and the second lead portion 12b illustrated in FIG. 2B also have the same planar shape as that in FIG. 2A, and only the width direction position of the unevenness and the position of the fuse portion 10 are different. is there. However, due to this difference, there are two intermediate regions M in the example of FIG. Moreover, the 1st lead part 11c and the 2nd lead part 12c which were illustrated in FIG.2 (C) each have an L-shaped planar shape instead of the uneven | corrugated shape in FIG. 2 (A), (B). The first lead portion 11c and the second lead portion 12c are bridged by the fuse portion 10, and there are two intermediate regions M.

リード端子に図２（Ａ）〜（Ｃ）で例示したような構造をもたせることで、ヒューズ部１０が溶断しても絶縁フィルムが変形し溶断部が再短絡しないような非水電解質電池１への取り付けが可能となる。実際、ヒューズ部１０の周りにリード部１１ｂ，１２ｂがあり、樹脂フィルム５がリード部１１ｂ，１２ｂ共にヒューズ部１０をラミネートする。ヒューズ部１０が溶断して樹脂フィルム５が熱せられても、周りのリード部１１ｂ，１２ｂと樹脂フィルム５が密着していて、そこの部分で変形が抑えられる。故に、樹脂フィルム５が変形することはなく溶断部の再短絡の恐れもない。   By providing the lead terminal with the structure illustrated in FIGS. 2A to 2C, the non-aqueous electrolyte battery 1 is formed such that even if the fuse portion 10 is melted, the insulating film is deformed and the melted portion is not short-circuited again. Can be attached. Actually, there are lead portions 11b and 12b around the fuse portion 10, and the resin film 5 laminates the fuse portion 10 together with the lead portions 11b and 12b. Even if the fuse portion 10 is melted and the resin film 5 is heated, the surrounding lead portions 11b and 12b and the resin film 5 are in close contact with each other, and deformation is suppressed at that portion. Therefore, the resin film 5 is not deformed and there is no fear of a re-short circuit of the fusing part.

図３は、図１のデバイスにおける図２のリード端子の取り付け位置を説明するための断面図である。図３（Ａ），（Ｃ）は、それぞれ別の取り付け位置の例を示し、図３（Ｂ）は図３（Ａ）のＢ−Ｂ方向断面図で、図３（Ｄ）は図３（Ｃ）のＤ−Ｄ方向断面図である。ここで、リード端子の取り付け位置についても、樹脂フィルム５が被覆された正極リード３についてのみ説明する。   3 is a cross-sectional view for explaining the mounting position of the lead terminal of FIG. 2 in the device of FIG. 3 (A) and 3 (C) show examples of different mounting positions, FIG. 3 (B) is a cross-sectional view in the BB direction of FIG. 3 (A), and FIG. 3 (D) is FIG. It is a DD direction sectional view of C). Here, only the positive electrode lead 3 covered with the resin film 5 will be described with respect to the mounting position of the lead terminal.

図３（Ａ），（Ｃ）で例示する取り付け位置（シール位置）は、いずれも正極リード３の一部が、外装ケース７における封入口（シール部８）の外に出された状態となっている。正極リード３においてシール部８の外に出た領域は、少なくとも非被覆領域を含めばよく、好ましくは被覆領域も含むとよい。   The attachment positions (seal positions) illustrated in FIGS. 3A and 3C are in a state where a part of the positive electrode lead 3 is put out of the sealing port (seal part 8) in the outer case 7. ing. The region of the positive electrode lead 3 that protrudes outside the seal portion 8 may include at least an uncovered region, and preferably includes a covered region.

図３（Ａ），（Ｃ）で例示したように、正極リード３が、シール部８にシールされ取り付けられている部分には、第二領域の全幅の部分に含まれる。これにより、電解液のしみ出しが生じ難い。正極リード３の全幅を含む部分では、樹脂フィルム５を含めたリード材の厚さが均一になり包材との密着性がよいからである。また、シール部８が正極リード３の中間領域Ｍの一部をシールすることで、シール部８によって第一リードと第二リード部とがシールされて固定されることになる。従って、ヒューズ部１０が切れた場合も両リード部がシール部８で固定されるので、一方のリード部が脱落することがない。   As illustrated in FIGS. 3A and 3C, the portion where the positive electrode lead 3 is sealed and attached to the seal portion 8 is included in the full width portion of the second region. Thereby, exudation of the electrolytic solution hardly occurs. This is because the thickness of the lead material including the resin film 5 is uniform in the portion including the entire width of the positive electrode lead 3 and the adhesiveness with the packaging material is good. Further, since the seal portion 8 seals a part of the intermediate region M of the positive electrode lead 3, the first lead and the second lead portion are sealed and fixed by the seal portion 8. Therefore, even when the fuse portion 10 is blown, both lead portions are fixed by the seal portion 8, so that one lead portion does not fall off.

より具体的に説明すると、図３（Ａ）で例示する取り付け位置は、シール部８に中間領域Ｍの一部だけでなく第二領域ＩＩの一部もかかるようになっている。この構造では、シール部８での断面形状は図３（Ｂ）のように完全にシールがなされ外装ケース７の封止性を損なわない構造であるため、外装ケース７内の電解液中の成分が外部に漏れる心配がない。これに対し、図３（Ｃ）で例示する取り付け位置は、シール部８に第二領域ＩＩの一部がかかるようになっていない。このため、シール部８での断面形状は図３（Ｄ）のように、第一リード部１１ａ及び第二リード部１２ａが無い部分は樹脂フィルム５が凹み、その上から包材をシールすると、その凹み部分１３が完全にシールできず空間として残ってしまう恐れがある。凹み部分１３で生じる隙間によって、外装ケース７内部の電解液中の成分が外部にしみ出てくる恐れがある。   More specifically, the attachment position exemplified in FIG. 3A is such that not only a part of the intermediate area M but also a part of the second area II is applied to the seal portion 8. In this structure, since the cross-sectional shape at the seal portion 8 is a structure that is completely sealed as shown in FIG. 3B and does not impair the sealing performance of the outer case 7, the components in the electrolyte in the outer case 7 There is no worry of leaking outside. On the other hand, in the attachment position illustrated in FIG. 3C, a part of the second region II is not applied to the seal portion 8. For this reason, as shown in FIG. 3D, the cross-sectional shape at the seal portion 8 is the portion where the first lead portion 11a and the second lead portion 12a are absent, and the resin film 5 is recessed, and the packaging material is sealed from above, There is a possibility that the recessed portion 13 cannot be completely sealed and remains as a space. Due to the gap generated in the recessed portion 13, the components in the electrolyte inside the outer case 7 may ooze out to the outside.

また、正極リード３は、図３（Ａ），（Ｃ）で示したように、外装ケース７の外にヒューズ領域Ｈ（ヒューズ部１０）を出した状態で、封入口であるシール部８にシールされ取り付けられていることが好ましい。特に、ヒューズ部１０を低融点物質（例えば半田）で構成した場合、シール部８にヒューズ部１０がかかる位置で取り付けると、外装ケース７の熱シールの熱で低融点物質が溶ける恐れがあるが、ヒューズ部１０を外に出して取り付けることでその恐れがなくなる。さらに、この構成により、ヒューズ部１０が切れたときに、万一、熱によりその部分の樹脂フィルム５が変形しても、電解液のしみ出しには影響せずに済む。   Further, as shown in FIGS. 3A and 3C, the positive electrode lead 3 is attached to the seal portion 8 which is an enclosing port in a state where the fuse region H (fuse portion 10) is exposed outside the outer case 7. Preferably it is sealed and attached. In particular, when the fuse portion 10 is made of a low melting point material (for example, solder), if the fuse portion 10 is attached to the seal portion 8 at a position where the fuse portion 10 is applied, the low melting point material may be melted by the heat of the heat seal of the outer case 7. The fear is eliminated by attaching the fuse part 10 outside. Further, with this configuration, when the fuse portion 10 is blown, even if the resin film 5 in that portion is deformed by heat, the exudation of the electrolytic solution is not affected.

以上、本発明に係る蓄電デバイス用リード端子について、非水電解質蓄電デバイスに設けた例を挙げて説明したが、このリード端子は、他のデバイスのリードとしても取り付け可能である。本発明のリード端子は、取り付け対象のデバイスが外包体を熱シールする必要があるものに特に有益となるが、デバイスの取り付け位置において少なくとも第一リード部の一部及び第二リード部の一部を押さえるような取り付け構造をもっていれば有益となる。   As described above, the lead terminal for the electricity storage device according to the present invention has been described with reference to the example provided in the nonaqueous electrolyte electricity storage device. However, the lead terminal can be attached as a lead of another device. The lead terminal of the present invention is particularly useful for a device to be attached that needs to heat-seal the outer package, but at least a part of the first lead part and a part of the second lead part at the device attachment position. It is beneficial to have a mounting structure that holds

本発明の一実施形態に係る非水電解質蓄電デバイスの構成例を示す斜視図である。It is a perspective view which shows the structural example of the nonaqueous electrolyte electrical storage device which concerns on one Embodiment of this invention. 図１のデバイスに使用されるリード端子の構成例を示す上面図である。It is a top view which shows the structural example of the lead terminal used for the device of FIG. 図１のデバイスにおける図２のリード端子の取り付け位置を説明するための断面図である。FIG. 3 is a cross-sectional view for explaining a mounting position of the lead terminal of FIG. 2 in the device of FIG. 1.

符号の説明Explanation of symbols

１…非水電解質電池、２…積層電極群、３…正極リード、４…負極リード、５，６…絶縁フィルム（樹脂フィルム）、７…外装ケース、８…シール部、１０…ヒューズ部、１１ａ，１１ｂ，１１ｃ…第一リード部、１２ａ，１２ｂ，１２ｃ…第二リード部、１３…凹み部分。 DESCRIPTION OF SYMBOLS 1 ... Nonaqueous electrolyte battery, 2 ... Laminated electrode group, 3 ... Positive electrode lead, 4 ... Negative electrode lead, 5, 6 ... Insulating film (resin film), 7 ... Outer case, 8 ... Seal part, 10 ... Fuse part, 11a , 11b, 11c ... first lead part, 12a, 12b, 12c ... second lead part, 13 ... recessed part.

Claims (7)

第一リード部、第二リード部、及び該第一リード部と該第二リード部の間を橋渡しするヒューズ部と、前記第一リード部の一部及び前記第二リード部の一部と共に前記ヒューズ部を被覆する樹脂フィルムとを備えた帯状の蓄電デバイス用リード端子であって、
当該リード端子における前記樹脂フィルムに覆われた領域は、当該リード端子の幅方向で見て、
前記第一リード部からなる第一領域と、
前記第二リード部からなる第二領域と、
前記第一リード部と前記第二リード部とからなる中間領域と、
を含むことを特徴とする蓄電デバイス用リード端子。 The first lead part, the second lead part, the fuse part bridging between the first lead part and the second lead part, the part of the first lead part and the part of the second lead part, A belt-shaped lead terminal for an electricity storage device provided with a resin film covering the fuse part,
The region covered with the resin film in the lead terminal is seen in the width direction of the lead terminal,
A first region comprising the first lead portion;
A second region comprising the second lead portion;
An intermediate region comprising the first lead portion and the second lead portion;
The lead terminal for electrical storage devices characterized by including. 前記ヒューズ部は、前記第一リード部及び前記第二リード部に対して断面積を小さくすることで過電流によって溶断する部位であることを特徴とする請求項１に記載の蓄電デバイス用リード端子。   The lead terminal for an electricity storage device according to claim 1, wherein the fuse part is a part that is melted by an overcurrent by reducing a cross-sectional area with respect to the first lead part and the second lead part. . 前記第一リード部と前記第二リード部とは異種金属とし、前記ヒューズ部は、前記第一リード部と前記第二リード部との接続部分の接続抵抗を高くすることで、過電流によって溶断する部位であることを特徴とする請求項１に記載の蓄電デバイス用リード端子。   The first lead portion and the second lead portion are made of different metals, and the fuse portion is blown by overcurrent by increasing the connection resistance of the connection portion between the first lead portion and the second lead portion. The lead terminal for an electricity storage device according to claim 1, wherein the lead terminal is a part to be operated. 前記樹脂フィルムは、少なくとも前記ヒューズ部を覆う部分で難燃性の樹脂でなることを特徴とする請求項１乃至３のいずれか１項に記載の蓄電デバイス用リード端子。   The lead terminal for an electricity storage device according to any one of claims 1 to 3, wherein the resin film is made of a flame-retardant resin at least at a portion covering the fuse portion. 請求項１乃至４のいずれか１項に記載の蓄電デバイス用リード端子を備え、正極、負極、電解質が外包体に収納された非水電解質蓄電デバイスであって、前記リード端子は、前記正極及び／又は前記負極に接続され、前記外包体の外に少なくとも前記第一リード部の非被覆部分又は前記第二リード部の非被覆部分を出した状態で、前記外包体の封入口に樹脂フィルム部分でシールされ取り付けられていることを特徴とする非水電解質蓄電デバイス。   A nonaqueous electrolyte electricity storage device comprising the lead terminal for an electricity storage device according to any one of claims 1 to 4, wherein a positive electrode, a negative electrode, and an electrolyte are housed in an outer package, wherein the lead terminal includes the positive electrode and the positive electrode A resin film portion connected to the negative electrode and in a state where at least an uncoated portion of the first lead portion or an uncoated portion of the second lead portion is exposed outside the outer envelope body A non-aqueous electrolyte electricity storage device, which is sealed with and attached. 前記リード端子は、前記外包体の封入口に前記第一領域の一部又は前記第二領域の一部を少なくとも含む領域でシールされ取り付けられていることを特徴とする請求項５に記載の非水電解質蓄電デバイス。   The non-lead according to claim 5, wherein the lead terminal is sealed and attached to a sealing port of the outer package in a region including at least a part of the first region or a part of the second region. Water electrolyte storage device. 前記リード端子は、前記外包体の外に前記ヒューズ部を出した状態で、前記封入口にシールされ取り付けられていることを特徴とする請求項５又は６に記載の非水電解質蓄電デバイス。   7. The nonaqueous electrolyte electricity storage device according to claim 5, wherein the lead terminal is sealed and attached to the enclosing port in a state where the fuse portion is exposed outside the outer package.
JP2007010142A 2007-01-19 2007-01-19 Lead terminal for power storage device with fuse and non-aqueous electrolyte power storage device Expired - Fee Related JP4609432B2 (en)

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