JP5277702B2 - Electrical parts, non-aqueous electrolyte batteries, and lead wires and enclosures used for them - Google Patents

Electrical parts, non-aqueous electrolyte batteries, and lead wires and enclosures used for them Download PDF

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JP5277702B2
JP5277702B2 JP2008110118A JP2008110118A JP5277702B2 JP 5277702 B2 JP5277702 B2 JP 5277702B2 JP 2008110118 A JP2008110118 A JP 2008110118A JP 2008110118 A JP2008110118 A JP 2008110118A JP 5277702 B2 JP5277702 B2 JP 5277702B2
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resin layer
insulating resin
lead conductor
enclosure
layer
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JP2009259739A (en
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豊 福田
圭太郎 宮澤
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Sumitomo Electric Industries Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E60/10Energy storage using batteries

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Description

本発明は、小型電子機器の電源等として用いられる電気部品及び非水電解質電池、並びにこれらを構成する部材であるリード線及び封入容器に関するものである。   The present invention relates to an electrical component and a nonaqueous electrolyte battery used as a power source of a small electronic device, and a lead wire and a sealed container which are members constituting these.

電子機器の小型化、軽量化に伴って、これらの機器に使用される電池などの電気部品についても小型化、軽量化が求められている。このため、例えば、袋体を封入容器として用い、その内部に非水電解質、正極、及び負極を封入してなる非水電解質電池が採用されている。   As electronic devices become smaller and lighter, electric components such as batteries used in these devices are also required to be smaller and lighter. For this reason, for example, a nonaqueous electrolyte battery in which a bag body is used as an enclosure and a nonaqueous electrolyte, a positive electrode, and a negative electrode are enclosed therein is employed.

封入容器には、電解液やガスの透過、外部からの水分の浸入を防止する性質が求められる。このため、アルミニウム箔などの金属層を樹脂で被覆したラミネートフィルムが封入容器の材料として用いられ、2枚のラミネートフィルムの端部を熱融着して封入容器を形成する。   The sealed container is required to have a property of preventing permeation of electrolyte and gas and intrusion of moisture from the outside. For this reason, a laminate film in which a metal layer such as an aluminum foil is coated with a resin is used as a material for the enclosure, and the ends of the two laminate films are heat-sealed to form an enclosure.

封入容器の内部には非水電解質、正極板、負極板、及び正負の極板間のセパレータ等を封入し、一端は開口部とする。さらに正極板、負極板にその一端が接続されたリード導体を封入容器の内部から外部へ延びるように配置して、最後に開口部をヒートシール(熱融着)することで封入容器の開口部を閉じると共に、封入容器とリード導体とを熱融着して開口部を封止する(この、最後に接着される部分をシール部と呼ぶ)。   A non-aqueous electrolyte, a positive electrode plate, a negative electrode plate, a separator between positive and negative electrode plates, and the like are enclosed in the enclosure, and one end is an opening. Furthermore, the lead conductor, one end of which is connected to the positive electrode plate and the negative electrode plate, is arranged so as to extend from the inside of the enclosing container to the outside, and finally the opening of the enclosing container is heat-sealed (heat fusion) And the sealed container and the lead conductor are heat-sealed to seal the opening (this last bonded portion is called a seal portion).

このとき、封入容器の金属層とリード導体との間には、熱融着層を介して接着される。この熱融着層はあらかじめリード導体のシール部に対応する部分に設けておくか、又は封入容器のシール部に対応する部分に設けておくことで封入容器の金属層とリード導体との間に介在させる。熱融着層には、金属層とリード導体との短絡を発生させることなく、接着性、シール性(密封性)を維持できるという特性が求められる。   At this time, the metal layer of the enclosure and the lead conductor are bonded via a heat-sealing layer. This heat-sealing layer is provided in advance in a portion corresponding to the seal portion of the lead conductor, or provided in a portion corresponding to the seal portion of the enclosure, so that the space between the metal layer of the enclosure and the lead conductor is provided. Intervene. The heat-fusible layer is required to have a characteristic that the adhesiveness and the sealing property (sealing property) can be maintained without causing a short circuit between the metal layer and the lead conductor.

特許文献1には、このような非水電解質電池に用いる電池用封入袋及びリード線が開示されている。リード導体の導体直上にのみマレイン酸変性ポリオレフィン層を設けることでシール部の密封性を高めることができると記載されている。
また特許文献2には、電池のリード線用フィルムとして、耐熱性基材フィルムの両面に押出ラミネート法による樹脂層を形成した多層フィルムからなることを特徴とするリード専用フィルムが開示されている。耐熱性基材フィルムが存在することで、熱融着時にリード線と袋体(封入容器)の金属層とがショートすることを防ぐことができる。
特許第3562129号公報 特開2002−245985号公報
Patent Document 1 discloses a battery encapsulating bag and a lead wire used in such a nonaqueous electrolyte battery. It is described that the sealing property of the seal portion can be improved by providing the maleic acid-modified polyolefin layer only directly on the conductor of the lead conductor.
Patent Document 2 discloses a lead-only film comprising a multilayer film in which a resin layer is formed on both surfaces of a heat-resistant base film by extrusion lamination as a battery lead film. The presence of the heat-resistant base film can prevent a short circuit between the lead wire and the metal layer of the bag body (enclosure container) during heat fusion.
Japanese Patent No. 3562129 Japanese Patent Laid-Open No. 2002-245985

上記のような非水電解質電池はケースに収納することが多いが、その際、リード線をシール部分で折り曲げて使用する。このときシール部の絶縁層として特許文献2に記載のような多層フィルムを用いると、折り曲げ部分が固くなり、組み立て時に折り曲げにくいという問題がある。また折り曲げ後の復元力(スプリングバック)も小さくする必要がある。しかし、このために絶縁層の厚みを薄くするとシール部分の機械的強度や、接着性、密封性が低下する可能性がある。   The non-aqueous electrolyte battery as described above is often housed in a case. At that time, the lead wire is bent at the seal portion and used. At this time, when a multilayer film as described in Patent Document 2 is used as the insulating layer of the seal portion, there is a problem that the bent portion becomes hard and is difficult to bend at the time of assembly. It is also necessary to reduce the restoring force (springback) after bending. However, if the thickness of the insulating layer is reduced for this purpose, the mechanical strength, adhesiveness, and sealing performance of the seal portion may be reduced.

本発明はこのような問題に鑑み、十分な機械的強度、接着性、密封性を保ちつつ、シール部分の柔軟性を上げ、折り曲げ時に必要な力を減らすことのできる絶縁樹脂材料とその使用形態を提供することを課題とする。   In view of such a problem, the present invention provides an insulating resin material capable of increasing the flexibility of the seal portion and reducing the force required for bending while maintaining sufficient mechanical strength, adhesiveness, and sealability, and a use form thereof. It is an issue to provide.

本発明は、金属層を有する封入容器と、前記封入容器の内部から外部に延びるリード導体とを有し、前記封入容器と前記リード導体とがシール部で熱融着されている電気部品であって、前記シール部の少なくとも一部において、前記金属層と前記リード導体との間に、引張弾性率が350MPa以下である絶縁樹脂層を有し、前記絶縁樹脂層が、ポリオレフィン系樹脂と、不飽和結合を持つエラストマーとを90:10〜10:90の割合で含有するとともに、前記絶縁樹脂層の少なくとも一部が、電離放射線の照射により架橋されていることを特徴とする電気部品である。 The present invention is an electrical component having a sealed container having a metal layer and a lead conductor extending from the inside of the sealed container to the outside, wherein the sealed container and the lead conductor are heat-sealed at a seal portion. In addition, at least a part of the seal portion has an insulating resin layer having a tensile elastic modulus of 350 MPa or less between the metal layer and the lead conductor, and the insulating resin layer includes a polyolefin resin and a non- conductive resin layer. The electrical component includes an elastomer having a saturated bond in a ratio of 90:10 to 10:90 , and at least a part of the insulating resin layer is crosslinked by irradiation with ionizing radiation .

引張弾性率が350MPa以下である絶縁樹脂層を使用することにより絶縁樹脂層が柔軟となり、折り曲げやすく、またスプリングバックも起こりにくくなる。   By using an insulating resin layer having a tensile elastic modulus of 350 MPa or less, the insulating resin layer becomes flexible, is easy to bend, and does not easily spring back.

絶縁樹脂層は、ポリオレフィン系樹脂と、エラストマーとを90:10〜10:90の割合で含有する。 Insulating resin layer, and a polyolefin resin, an elastomer 90: 10 to 10: you a proportion of 90.

ポリオレフィン系樹脂と、エラストマーとを特定の割合で含有する絶縁樹脂層を使用することで、折り曲げ加工時に必要とされる力や折り曲げ加工後の復元力を大幅に低減できるのみならず、折曲げ加工後時間が経過しても接着性、密封性を維持することができる電気部品が得られる。   By using an insulating resin layer containing polyolefin resin and elastomer in a specific ratio, not only can the force required during bending and the restoring force after bending be greatly reduced, but bending can also be performed. An electrical component that can maintain adhesiveness and hermeticity even after the passage of time is obtained.

また、エラストマーは、不飽和結合を持つ。不飽和結合を持つことにより絶縁樹脂層の架橋性を高めることができる。 Further, the elastomer one lifting unsaturated bond. By having an unsaturated bond, the crosslinkability of the insulating resin layer can be enhanced.

絶縁樹脂層の少なくとも一部は、電離放射線の照射により架橋されていることが好ましい。絶縁樹脂層が架橋されることでシール部の耐熱性を向上することができ、金属層とリード導体との短絡を防止することができる。そのため高温で使用した場合でもシール部の接着性、密封性を維持することができる。 At least a portion of the insulating resin layer, it is not preferable that the crosslinked by irradiation with ionizing radiation. By cross-linking the insulating resin layer, the heat resistance of the seal portion can be improved, and a short circuit between the metal layer and the lead conductor can be prevented. Therefore, even when used at a high temperature, the adhesiveness and sealability of the seal portion can be maintained.

本発明には、金属層を有する封入容器、前記封入容器の内部から外部に延びるリード導体、並びに前記封入容器の内部に封入された非水電解質及び前記封入容器の内部に封入され、前記リード導体の端部に接続される電極を有し、前記封入容器と前記リード導体とがシール部で熱融着されている非水電解質電池であって、前記シール部の少なくとも一部において、前記金属層と前記リード導体との間に、引張弾性率が350MPa以下である絶縁樹脂層を有し、前記絶縁樹脂層が、ポリオレフィン系樹脂と、不飽和結合を持つエラストマーとを90:10〜10:90の割合で含有するとともに、前記絶縁樹脂層の少なくとも一部が、電離放射線の照射により架橋されていることを特徴とする非水電解質電池が含まれる。 The present invention includes an enclosure having a metal layer, a lead conductor extending from the inside of the enclosure, the nonaqueous electrolyte enclosed in the enclosure, and the lead conductor enclosed in the enclosure. A non-aqueous electrolyte battery having an electrode connected to an end of the sealing member, wherein the sealed container and the lead conductor are heat-sealed at a seal portion, wherein the metal layer is formed on at least a part of the seal portion. And an insulating resin layer having a tensile modulus of 350 MPa or less between the lead conductor and the lead conductor, and the insulating resin layer comprises a polyolefin-based resin and an elastomer having an unsaturated bond in a range of 90:10 to 10:90. And a nonaqueous electrolyte battery characterized in that at least a part of the insulating resin layer is crosslinked by irradiation with ionizing radiation .

このような構成の非水電解質電池は、リード線及び封入容器を折り曲げる際の加工に要する力を低減することができ、さらに使用状態で時間が経過しても接着性、密封性を維持することができる。   The non-aqueous electrolyte battery having such a configuration can reduce the force required for processing when bending the lead wire and the enclosing container, and can maintain adhesiveness and sealing performance even if time passes in use. Can do.

また本発明には、本発明の電気部品又は非水電解質電池に用いられるリード線であって、リード導体と、前記リード導体の前記シール部に対応する部分の少なくとも一部を被覆する絶縁樹脂層を有し、前記絶縁樹脂層の引張弾性率が350MPa以下であり、前記絶縁樹脂層が、ポリオレフィン系樹脂と、不飽和結合を持つエラストマーとを90:10〜10:90の割合で含有するとともに、前記絶縁樹脂層の少なくとも一部が、電離放射線の照射により架橋されていることを特徴とするリード線が含まれる。 The present invention also provides a lead wire used in the electrical component or non-aqueous electrolyte battery of the present invention, wherein the lead conductor and an insulating resin layer covering at least a part of the portion corresponding to the seal portion of the lead conductor. have the have a tensile modulus of the insulating resin layer is 350MPa or less, the insulating resin layer, and a polyolefin resin, an elastomer having unsaturated bonds 90: 10 to 10: with a proportion of 90 The lead wire is characterized in that at least a part of the insulating resin layer is crosslinked by irradiation with ionizing radiation .

リード導体のシール部に対応する部分とは、リード導体と封入容器(金属層)とが接着する部分である。この部分に対応するリード導体の片面、又は両面を絶縁樹脂層で被覆し、該絶縁樹脂層の引張弾性率を350MPa以下とすることで、シール部の加工時の折り曲げ力と折曲げ加工後の復元力を低減できる。   The portion corresponding to the seal portion of the lead conductor is a portion where the lead conductor and the enclosure (metal layer) are bonded. One side or both sides of the lead conductor corresponding to this part are covered with an insulating resin layer, and the tensile elastic modulus of the insulating resin layer is 350 MPa or less, so that the bending force at the time of processing the seal portion and Restoring power can be reduced.

さらに本発明には、本発明の電気部品、又は非水電解質電池に用いられる封入容器であって、金属層と、前記金属層の前記シール部に対応する部分の少なくとも一部を被覆する絶縁樹脂層とを有し、前記絶縁樹脂層の引張弾性率が350MPa以下であり、前記絶縁樹脂層が、ポリオレフィン系樹脂と、不飽和結合を持つエラストマーとを90:10〜10:90の割合で含有するとともに、前記絶縁樹脂層の少なくとも一部が、電離放射線の照射により架橋されていることを特徴とする封入容器が含まれる。 Further, according to the present invention, there is provided an encapsulating container used for the electrical component of the present invention or the non-aqueous electrolyte battery, wherein the insulating layer covers at least a part of the metal layer and the portion corresponding to the seal portion of the metal layer. and a layer, wherein the insulation is a tensile elastic modulus of the resin layer is 350MPa or less, the insulating resin layer, and a polyolefin resin, an elastomer having unsaturated bonds 90: 10 to 10: in a proportion of 90 In addition, a sealed container is included in which at least a part of the insulating resin layer is crosslinked by irradiation with ionizing radiation .

金属層のシール部に対応する部分とは、リード導体と封入容器(金属層)とが接着する部分である。封入容器は一般に、金属層と、金属層の全面を被覆する樹脂層とからなるラミネートフィルムから形成されるが、このシール部に対応する部分の樹脂層の上に該絶縁樹脂層を設けても良いし、樹脂層の全部又は一部を上記の絶縁樹脂層に置き換えても良い。   The portion corresponding to the seal portion of the metal layer is a portion where the lead conductor and the enclosure (metal layer) are bonded. The enclosure is generally formed of a laminate film composed of a metal layer and a resin layer covering the entire surface of the metal layer, but the insulating resin layer may be provided on the resin layer corresponding to the seal portion. Alternatively, all or part of the resin layer may be replaced with the insulating resin layer.

本発明によれば、シール部分の柔軟性を上げ、折り曲げ時に必要な力を減らすことのできる電気部品、非水電解質電池、及びそれらに用いるリード線、封入容器を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the electrical component which can raise the softness | flexibility of a seal | sticker part and can reduce the force required at the time of a bending, a nonaqueous electrolyte battery, the lead wire used for them, and an enclosure can be provided.

本発明の絶縁樹脂層の材料として用いるポリオレフィン系樹脂としては、ポリエチレン、ポリプロピレン、アイオノマー樹脂、変性ポリオレフィン等が例示され、金属との接着性の点から接着性ポリオレフィン樹脂が好ましく使用される。なお、接着性ポリオレフィン樹脂とは、マレイン酸、アクリル酸、メタクリル酸、無水マレイン酸等のカルボン酸や、エポキシ等で変性されて接着性の官能基を持つポリオレフィン樹脂をいう。特に、無水マレイン酸変性ポリオレフィン樹脂は金属との接着性、シール性に優れているので好ましい。これらのポリオレフィン系樹脂は熱可塑性樹脂であり、ヒートシール時に加熱により溶融して封入容器の金属層とリード導体とを接着させる。   Examples of the polyolefin resin used as the material for the insulating resin layer of the present invention include polyethylene, polypropylene, ionomer resin, modified polyolefin, and the like, and an adhesive polyolefin resin is preferably used from the viewpoint of adhesion to metal. The adhesive polyolefin resin refers to a polyolefin resin having an adhesive functional group modified with carboxylic acid such as maleic acid, acrylic acid, methacrylic acid or maleic anhydride, or epoxy. In particular, maleic anhydride-modified polyolefin resin is preferable because it is excellent in adhesion to metal and sealability. These polyolefin-based resins are thermoplastic resins, and are melted by heating at the time of heat sealing to bond the metal layer of the enclosing container and the lead conductor.

本発明の絶縁樹脂層の材料として用いるエラストマーとしては、ポリブタジエン、EPDM、EPM、アクリルゴム、熱可塑性エラストマー等が例示され、水添スチレン・ブタジエンゴム、1,2−ポリブタジエン等が好ましく使用できる。エラストマーの種類を適宜選択することで絶縁樹脂層の弾性率をコントロールできる。   Examples of the elastomer used as the material for the insulating resin layer of the present invention include polybutadiene, EPDM, EPM, acrylic rubber, thermoplastic elastomer, and the like. Hydrogenated styrene / butadiene rubber, 1,2-polybutadiene, and the like can be preferably used. The elastic modulus of the insulating resin layer can be controlled by appropriately selecting the type of elastomer.

本発明の絶縁樹脂層は、上記のポリオレフィン系樹脂とエラストマーとを90:10〜10:90の割合で含有することが好ましい。エラストマーの含有量が上記の割合よりも少ないと絶縁樹脂層の引張弾性率を350MPa以下にすることが難しい。またエラストマーの含有量が上記の割合よりも多くなるとヒートシール時に絶縁樹脂層の流れ出し量が多くなり、金属層とリード導体の短絡が生じやすくなる。また、耐熱性や耐外傷性が低下し十分な耐久性が得られない。さらに好ましいポリオレフィン系樹脂とポリオレフィン系エラストマーとの混合比は、80:20〜20:80である。   The insulating resin layer of the present invention preferably contains the above polyolefin resin and elastomer in a ratio of 90:10 to 10:90. When the content of the elastomer is less than the above ratio, it is difficult to make the tensile elastic modulus of the insulating resin layer 350 MPa or less. If the elastomer content exceeds the above ratio, the amount of the insulating resin layer that flows out during heat sealing increases, and the metal layer and the lead conductor are likely to be short-circuited. In addition, heat resistance and trauma resistance are reduced, and sufficient durability cannot be obtained. A more preferable mixing ratio between the polyolefin resin and the polyolefin elastomer is 80:20 to 20:80.

本発明の絶縁樹脂層には、必要に応じて酸化防止剤、難燃剤、紫外線吸収剤、光安定剤、熱安定剤、滑剤、着色剤等の各種添加剤を混合することができる。また本発明の趣旨を損ねない程度において他の樹脂を混合しても良い。これらの材料をオープンロール、加圧ニーダー、単軸混合機、2軸混合機等の既知の混合装置を用いて混合し、押出成形等によってフィルム状の絶縁樹脂層を作製する。   In the insulating resin layer of the present invention, various additives such as an antioxidant, a flame retardant, an ultraviolet absorber, a light stabilizer, a heat stabilizer, a lubricant, and a colorant can be mixed as necessary. Moreover, you may mix other resin in the grade which does not impair the meaning of this invention. These materials are mixed using a known mixing apparatus such as an open roll, a pressure kneader, a single-screw mixer, or a twin-screw mixer, and a film-like insulating resin layer is produced by extrusion molding or the like.

絶縁樹脂層は、加速電子線やγ線などの電離放射線の照射によって架橋して使用することもできる。樹脂を架橋することで耐熱性を高めることができ、使用時の温度が上がった場合の接着力の低下や、リード導体と金属層との短絡を防止することができる。生産性向上の観点から、電離放射線の照射による架橋を行うことが好ましい。   The insulating resin layer can be used after being crosslinked by irradiation with ionizing radiation such as an accelerated electron beam or γ-ray. By cross-linking the resin, the heat resistance can be increased, and a decrease in adhesive strength when the temperature during use is increased and a short circuit between the lead conductor and the metal layer can be prevented. From the viewpoint of improving productivity, it is preferable to perform crosslinking by irradiation with ionizing radiation.

次に本発明の電気部品の構造について図を用いて説明する。図1はリチウム電池などの非水電解質電池の一実施形態を模式的に表す正面図であり、図2は図1のA−A’部における部分断面図である。この非水電解質電池1は、略長方形の封入容器2と、封入容器2の内部から外部に延びるリード導体3を有している。   Next, the structure of the electrical component of the present invention will be described with reference to the drawings. FIG. 1 is a front view schematically showing an embodiment of a nonaqueous electrolyte battery such as a lithium battery, and FIG. 2 is a partial cross-sectional view taken along the line A-A ′ of FIG. 1. This nonaqueous electrolyte battery 1 has a substantially rectangular enclosure 2 and a lead conductor 3 extending from the inside of the enclosure 2 to the outside.

このような電機部品をケースに収納する場合、リード導体3を折り曲げて使用する。リード導体の折り曲げ位置は、リード導体と絶縁層が重なった部分(図1のB)とするか、リード導体と絶縁層、封入容器が重なった部分(図1のC)とする。   When such an electrical component is stored in a case, the lead conductor 3 is bent and used. The bending position of the lead conductor is a portion where the lead conductor and the insulating layer overlap (B in FIG. 1), or a portion where the lead conductor, the insulating layer and the enclosing container overlap (C in FIG. 1).

封入容器2は、図2に示されるように、金属層5と、金属層5を被覆する樹脂層6,7とからなる3層のラミネートフィルム8からなる。金属層5はアルミニウム箔などの金属から形成される。封入容器の外側に位置する樹脂層6としては6,6−ナイロン、6−ナイロンなどのポリアミド樹脂や、ポリエステル樹脂、ポリイミド樹脂等を用いることができる。また封入容器2の内部に位置する樹脂層7には、非水電解質に溶解せず、また加熱して溶融する絶縁性樹脂を用いることが好ましく、ポリオレフィン系樹脂、酸変性ポリオレフィン系樹脂が例示され、金属との接着性の観点から酸変性ポリオレフィン樹脂が好ましい。また後述するように、樹脂層7としてポリオレフィン系樹脂と、エラストマーと90:10〜10:90の割合で含有する絶縁樹脂層を用いても良い。封入容器2は、2枚のラミネートフィルム8を重ね合わせて、リード導体が貫通する辺以外の3辺をヒートシールして作製する。封入容器の外周部では、2つの金属層5は樹脂層7を介して接着される。   As shown in FIG. 2, the enclosure 2 includes a three-layer laminate film 8 including a metal layer 5 and resin layers 6 and 7 covering the metal layer 5. The metal layer 5 is formed from a metal such as an aluminum foil. As the resin layer 6 positioned outside the enclosure, polyamide resin such as 6,6-nylon and 6-nylon, polyester resin, polyimide resin, or the like can be used. In addition, it is preferable to use an insulating resin that does not dissolve in the non-aqueous electrolyte and melts when heated, for the resin layer 7 located inside the enclosure 2, and examples thereof include polyolefin resins and acid-modified polyolefin resins. From the viewpoint of adhesion to metal, an acid-modified polyolefin resin is preferred. As will be described later, an insulating resin layer containing a polyolefin resin and an elastomer in a ratio of 90:10 to 10:90 may be used as the resin layer 7. The enclosure 2 is produced by superposing two laminated films 8 and heat-sealing three sides other than the side through which the lead conductor passes. At the outer peripheral portion of the enclosure, the two metal layers 5 are bonded via the resin layer 7.

シール部9において、リード導体3は、絶縁樹脂層4を介して封入容器(ラミネートフィルム8)と接着(熱融着)される。樹脂層7として、ポリオレフィン系樹脂と、エラストマーと90:10〜10:90の割合で含有する絶縁樹脂層を用いた場合には絶縁樹脂層4を省略しても良い。   In the seal portion 9, the lead conductor 3 is bonded (heat-sealed) to the sealed container (laminate film 8) via the insulating resin layer 4. As the resin layer 7, the insulating resin layer 4 may be omitted when an insulating resin layer containing a polyolefin resin and an elastomer in a ratio of 90:10 to 10:90 is used.

絶縁樹脂層4は、予めリード導体3のシール部に対応する部分を被覆するように設けても良い。このような構造のものをリード線と定義する。図3はリード線の概略断面図である。リード線には絶縁樹脂層4以外の熱可塑性樹脂層をさらに設けても良い。   The insulating resin layer 4 may be provided in advance so as to cover a portion corresponding to the seal portion of the lead conductor 3. Such a structure is defined as a lead wire. FIG. 3 is a schematic cross-sectional view of a lead wire. A thermoplastic resin layer other than the insulating resin layer 4 may be further provided on the lead wire.

また絶縁樹脂層4を、予め封入容器側に設けても良い。この場合、ラミネートフィルム8の少なくともシール部に対応する部分を絶縁樹脂層4で被覆する。このような封入容器としては、樹脂層7の内部に絶縁樹脂層4を設けた形態(図4)や、絶縁樹脂層7の全部を絶縁樹脂層4に置き換えた形態(図5)、及び絶縁樹脂層7の一部(シール部に対応する部分)を絶縁樹脂層4に置き換えた形態等(図6)が例示される。またリード導体と封入容器とをシール(熱融着)する際に、絶縁樹脂層をリード導体と封入容器の間に挟み込んでも良い。   Moreover, you may provide the insulating resin layer 4 in the enclosure container side previously. In this case, at least a portion of the laminate film 8 corresponding to the seal portion is covered with the insulating resin layer 4. As such a sealed container, a form in which the insulating resin layer 4 is provided inside the resin layer 7 (FIG. 4), a form in which the entire insulating resin layer 7 is replaced with the insulating resin layer 4 (FIG. 5), and insulation The form etc. (FIG. 6) which substituted a part of resin layer 7 (part corresponding to a seal | sticker part) with the insulating resin layer 4 are illustrated. Further, when sealing (heat-sealing) the lead conductor and the enclosure, an insulating resin layer may be sandwiched between the lead conductor and the enclosure.

リード導体3としてはアルミニウム、ニッケル、銅、ニッケルめっきされた銅などの金属が使用される。リチウム電池の場合は正極にはアルミニウム、負極にはニッケルが用いられることが多い。   As the lead conductor 3, a metal such as aluminum, nickel, copper, nickel-plated copper or the like is used. In the case of a lithium battery, aluminum is often used for the positive electrode and nickel is often used for the negative electrode.

非水電解質電池の内部には、更に、リード導体の端部に接続された正極または負極集電体10、11、及び非水電解質(図示せず)、並びにセパレータ12、正極または負極活物質13、14が封入される。   Inside the non-aqueous electrolyte battery, there are further the positive or negative electrode current collectors 10 and 11 connected to the end of the lead conductor, the non-aqueous electrolyte (not shown), the separator 12, the positive or negative electrode active material 13. , 14 are enclosed.

この実施形態においては、リチウム電池を例に説明したが、本発明の電気部品及び非水電解質電池はこの形状に限られない。   In this embodiment, the lithium battery has been described as an example, but the electric component and the nonaqueous electrolyte battery of the present invention are not limited to this shape.

また、本発明の電気部品は、非水電解質電池にかぎらず、電解コンデンサやコイル、抵抗器、半導体など広く一般に薄型の外装とリード線を必要とする電気部品の構成要素とする事が出来る。   Moreover, the electrical component of the present invention is not limited to non-aqueous electrolyte batteries, and can be used as a component of electrical components that require a generally thin exterior and lead wires, such as electrolytic capacitors, coils, resistors, and semiconductors.

次に発明を実施するための最良の形態を実施例により説明する。実施例は本発明の範囲を限定するものではない。   Next, the best mode for carrying out the invention will be described by way of examples. The examples are not intended to limit the scope of the invention.

(実施例1〜5、比較例1、2)
(絶縁樹脂層の弾性率評価)
表1に示す配合で変性ポリオレフィン樹脂とエラストマーとを混合し、厚さ100μmの絶縁樹脂層を作製した。得られた絶縁樹脂層から幅10mm、長さ200mmのサンプルを作製し、標線間距離100mm、引っ張り速度1mm/分で引張試験を行い、引張弾性率を測定した。なお試験温度は25℃である。結果を表1に示す。
(Examples 1 to 5, Comparative Examples 1 and 2)
(Evaluation of elastic modulus of insulating resin layer)
A modified polyolefin resin and an elastomer were mixed with the formulation shown in Table 1 to produce an insulating resin layer having a thickness of 100 μm. A sample having a width of 10 mm and a length of 200 mm was prepared from the obtained insulating resin layer, a tensile test was performed at a distance between marked lines of 100 mm and a pulling speed of 1 mm / min, and a tensile elastic modulus was measured. The test temperature is 25 ° C. The results are shown in Table 1.

(導体接着力測定方法)
上記で得られた絶縁樹脂層と、リード導体(厚さ0.1mm、幅5mm、長さ50mmのアルミニウム板)とを200℃で3秒プレスして接着させ、リード線を作製した。リード導体と絶縁樹脂層との接着力を180°剥離試験(引張速度100mm/分、絶縁樹脂層を剥離)で測定し、導体接着力とした。結果を表1に示す。
(Measurement method of conductor adhesion)
The insulating resin layer obtained above and the lead conductor (aluminum plate having a thickness of 0.1 mm, a width of 5 mm, and a length of 50 mm) were pressed and bonded at 200 ° C. for 3 seconds to produce a lead wire. The adhesive force between the lead conductor and the insulating resin layer was measured by a 180 ° peel test (tensile speed of 100 mm / min, and the insulating resin layer was peeled off) to obtain the conductor adhesive force. The results are shown in Table 1.

(比較例3)
絶縁樹脂層として、変性ポリオレフィン樹脂(厚み30μm)/ポリエチレンテレフタレートフィルム(厚み25μm)/変性ポリオレフィン樹脂(厚み30μm)の3層を重ね合わせた多層フィルムを使用し、実施例1〜5、比較例1、2と同様に弾性率と導体接着力を測定した。なお、ここで使用した変性ポリオレフィン樹脂は、実施例1〜5で使用した変性ポリオレフィン樹脂と同じものである。
(Comparative Example 3)
As the insulating resin layer, a multilayer film in which three layers of modified polyolefin resin (thickness 30 μm) / polyethylene terephthalate film (thickness 25 μm) / modified polyolefin resin (thickness 30 μm) are used is used. 2 and the elastic modulus and the conductor adhesive force were measured. The modified polyolefin resin used here is the same as the modified polyolefin resin used in Examples 1 to 5.

Figure 0005277702
Figure 0005277702

(脚注)
(*1)無水マレイン酸変性ポリプロピレン(密度0.89g/cm、MFR2.82g/10min、融点140℃)
(*2)シンジオタクチック1,2−ポリブタジエン(JSR(株)製、RB830)
(*3)水添スチレンブタジエンラバー(JSR(株)製、DYNARON(登録商標)1320P)
(footnote)
(* 1) Maleic anhydride-modified polypropylene (density 0.89 g / cm 3 , MFR 2.82 g / 10 min, melting point 140 ° C.)
(* 2) Syndiotactic 1,2-polybutadiene (manufactured by JSR Corporation, RB830)
(* 3) Hydrogenated styrene butadiene rubber (manufactured by JSR Corporation, DYNARON (registered trademark) 1320P)

実施例1〜5では、弾性率、導体接着力ともに良好であり、この絶縁樹脂層を使用した電気部品ではリード導体の折り曲げ力を低減できる。これに対しエラストマーを含有しない比較例1では、弾性率が450MPaと大きく、リード導体の折り曲げ部分が固くなる。多層フィルムを使用した比較例3では、弾性率が920MPaと、更に高くなっている。またポリオレフィン系エラストマーのみを使用した比較例2では、弾性率は良好であるが導体接着力が小さく、十分な接着力を確保できない。   In Examples 1 to 5, both the elastic modulus and the conductor adhesive force are good, and the bending force of the lead conductor can be reduced in an electrical component using this insulating resin layer. On the other hand, in Comparative Example 1 containing no elastomer, the elastic modulus is as large as 450 MPa, and the bent portion of the lead conductor becomes hard. In Comparative Example 3 using the multilayer film, the elastic modulus is further increased to 920 MPa. In Comparative Example 2 using only the polyolefin-based elastomer, the elastic modulus is good, but the conductor adhesive force is small, and sufficient adhesive force cannot be secured.

これらの結果より、本実施形態の絶縁樹脂層を使用したリード線、封入容器及びこれらを用いた電気部品、非水電解質電池は、リード導体の折り曲げ力を低減できると共に、十分な接着力を有することがわかる。   From these results, the lead wire using the insulating resin layer of the present embodiment, the encapsulated container, the electrical component using these, and the nonaqueous electrolyte battery can reduce the bending force of the lead conductor and have sufficient adhesive strength. I understand that.

本発明の一実施形態に係る非水電解質電池の正面図である。It is a front view of the nonaqueous electrolyte battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係る非水電解質電池の部分断面図である。It is a fragmentary sectional view of the nonaqueous electrolyte battery concerning one embodiment of the present invention. 本発明の一実施形態に係るリード線の部分断面図である。It is a fragmentary sectional view of the lead wire concerning one embodiment of the present invention. 本発明の一実施形態に係る封入容器の部分断面図である。It is a fragmentary sectional view of the enclosure container concerning one embodiment of the present invention. 本発明の一実施形態に係る封入容器の部分断面図である。It is a fragmentary sectional view of the enclosure container concerning one embodiment of the present invention. 本発明の一実施形態に係る封入容器の部分断面図である。It is a fragmentary sectional view of the enclosure container concerning one embodiment of the present invention.

符号の説明Explanation of symbols

1 非水電解質電池
2 封入容器
3 リード導体
4 絶縁樹脂層
5 金属層
6 樹脂層
7 樹脂層
8 ラミネートフィルム
9 シール部
10 正極集電体
11 負極集電体
12 セパレータ
13 正極活物質
14 負極活物質
DESCRIPTION OF SYMBOLS 1 Nonaqueous electrolyte battery 2 Enclosed container 3 Lead conductor 4 Insulating resin layer 5 Metal layer 6 Resin layer 7 Resin layer 8 Laminate film 9 Sealing part 10 Positive electrode current collector 11 Negative electrode current collector 12 Separator 13 Positive electrode active material 14 Negative electrode active material

Claims (4)

金属層を有する封入容器と、前記封入容器の内部から外部に延びるリード導体とを有し、
前記封入容器と前記リード導体とがシール部で熱融着されている電気部品であって、
前記シール部の少なくとも一部において、前記金属層と前記リード導体との間に、引張弾性率が350MPa以下である絶縁樹脂層を有し、前記絶縁樹脂層が、ポリオレフィン系樹脂と、不飽和結合を持つエラストマーとを90:10〜10:90の割合で含有するとともに、前記絶縁樹脂層の少なくとも一部が、電離放射線の照射により架橋されていることを特徴とする電気部品。
An enclosing container having a metal layer, and a lead conductor extending from the inside of the enclosing container to the outside,
An electrical component in which the sealed container and the lead conductor are heat-sealed at a seal portion,
At least part of the seal portion, between said metal layer and the lead conductor has a tensile insulating resin layer modulus is not more than 350 MPa, the insulating resin layer, and a polyolefin resin, unsaturated bonds And an elastomer having a ratio of 90:10 to 10:90 , and at least a part of the insulating resin layer is crosslinked by irradiation with ionizing radiation .
金属層を有する封入容器、前記封入容器の内部から外部に延びるリード導体、並びに前記封入容器の内部に封入された非水電解質及び前記封入容器の内部に封入され、前記リード導体の端部に接続される電極を有し、前記封入容器と前記リード導体とがシール部で熱融着されている非水電解質電池であって、
前記シール部の少なくとも一部において、前記金属層と前記リード導体との間に、引張弾性率が350MPa以下である絶縁樹脂層を有し、前記絶縁樹脂層が、ポリオレフィン系樹脂と、不飽和結合を持つエラストマーとを90:10〜10:90の割合で含有するとともに、前記絶縁樹脂層の少なくとも一部が、電離放射線の照射により架橋されていることを特徴とする非水電解質電池。
An enclosure having a metal layer, a lead conductor extending from the inside of the enclosure, and a nonaqueous electrolyte enclosed in the enclosure and the inside of the enclosure, and connected to an end of the lead conductor A non-aqueous electrolyte battery in which the sealed container and the lead conductor are heat-sealed at a seal portion,
At least part of the seal portion, between said metal layer and the lead conductor has a tensile insulating resin layer modulus is not more than 350 MPa, the insulating resin layer, and a polyolefin resin, unsaturated bonds A non-aqueous electrolyte battery comprising : an elastomer having a ratio of 90:10 to 10:90 , and at least a part of the insulating resin layer being cross-linked by irradiation with ionizing radiation .
請求項1に記載の電気部品、又は請求項2に記載の非水電解質電池に用いられるリード線であって、
リード導体と、前記リード導体の前記シール部に対応する部分の少なくとも一部を被覆す
る絶縁樹脂層を有し、前記絶縁樹脂層の引張弾性率が350MPa以下であり、前記絶縁樹脂層が、ポリオレフィン系樹脂と、不飽和結合を持つエラストマーとを90:10〜10:90の割合で含有するとともに、前記絶縁樹脂層の少なくとも一部が、電離放射線の照射により架橋されていることを特徴とするリード線。
A lead wire used in the electrical component according to claim 1 or the nonaqueous electrolyte battery according to claim 2,
A lead conductor having an insulating resin layer covering at least a portion of the portion corresponding to the sealing portion of the lead conductor, the tensile modulus of the insulating resin layer is not more than 350 MPa, the insulating resin layer is a polyolefin And an elastomer having an unsaturated bond in a ratio of 90:10 to 10:90 , and at least a part of the insulating resin layer is crosslinked by irradiation with ionizing radiation. Lead.
請求項1に記載の電気部品、又は請求項2に記載の非水電解質電池に用いられる封入容器であって、
金属層と、前記金属層の前記シール部に対応する部分の少なくとも一部を被覆する絶縁樹
脂層とを有し、前記絶縁樹脂層の引張弾性率が350MPa以下であり、前記絶縁樹脂層が、ポリオレフィン系樹脂と、不飽和結合を持つエラストマーとを90:10〜10:90の割合で含有するとともに、前記絶縁樹脂層の少なくとも一部が、電離放射線の照射により架橋されていることを特徴とする封入容器。
A sealed container used for the electrical component according to claim 1 or the nonaqueous electrolyte battery according to claim 2,
And a metal layer, said covering at least a portion of the portion corresponding to the sealing portion of the metal layer and an insulating resin layer, the tensile elastic modulus of the insulating resin layer is not more than 350 MPa, the insulating resin layer is, The polyolefin resin and the elastomer having an unsaturated bond are contained in a ratio of 90:10 to 10:90 , and at least a part of the insulating resin layer is crosslinked by irradiation with ionizing radiation. Enclosed container.
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