JP2007265879A - Film-armored electric device and electric device assembly - Google Patents

Film-armored electric device and electric device assembly Download PDF

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JP2007265879A
JP2007265879A JP2006091174A JP2006091174A JP2007265879A JP 2007265879 A JP2007265879 A JP 2007265879A JP 2006091174 A JP2006091174 A JP 2006091174A JP 2006091174 A JP2006091174 A JP 2006091174A JP 2007265879 A JP2007265879 A JP 2007265879A
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film
battery
sealing
exterior
clad
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JP5202815B2 (en
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Takaaki Fujitani
貴昭 藤谷
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Subaru Corp
NEC Lamilion Energy Ltd
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NEC Lamilion Energy Ltd
Fuji Heavy 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

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a film-armored device and the like wherein an odorous component sealed in a packaging body formed of an armoring film is hardly emitted to the outside. <P>SOLUTION: This film-armored battery 20 is structured such that a battery element 22 is stored along with an electrolyte in a packaging body formed of armoring films 24A and 24B having flexibility. The peripheral parts of the armoring films 24A and 24B are thermally welded to each other, and the parts thereof are formed into a sealing part 23. A sealing tape 30 having a gas barrier property is arranged on the sealing part 23 to cover the end surfaces thereof. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、電気的エネルギーを貯留および出力するための電気デバイス要素を、可撓性を有する外装フィルムで封止したフィルム外装電気デバイス（例えば電池またはキャパシタ等）に関し、さらには、それが集合した電気デバイス集合体（例えば組電池等）に関する。   The present invention relates to a film-clad electrical device (for example, a battery or a capacitor) in which an electrical device element for storing and outputting electrical energy is sealed with a flexible packaging film. The present invention relates to an electric device assembly (for example, an assembled battery).

近年、モータを駆動源とする電気自動車や、モータとエンジンの両方を駆動源とするハイブリットカーが実用に供されており、この種の自動車の電源としてフィルム外装電池の開発が進められている。フィルム外装電池は、ラミネートフィルムなどの可撓性を有する外装フィルムで構成された包装体のなかに、電圧を生じさせるための電池要素（積層体）が電解液と共に収容される構成となっている。   In recent years, electric vehicles using a motor as a driving source and hybrid cars using both a motor and an engine as driving sources have been put into practical use, and development of a film-clad battery as a power source for this type of vehicle has been promoted. The film-clad battery has a configuration in which a battery element (laminated body) for generating a voltage is accommodated together with an electrolytic solution in a packaging body constituted by a flexible exterior film such as a laminate film. .

外装フィルムからなる包装体は、互いに対向する２枚の外装フィルムの周縁部同士を熱融着することにより、袋状に形成されたものである。ここで「熱融着する」とは、一方の外装フィルムのシール層（樹脂層）と、他方の外装フィルムのシール層（樹脂層）とを溶融させて接合することである。   The package made of the exterior film is formed into a bag shape by heat-sealing the peripheral portions of the two exterior films facing each other. Here, “to heat-seal” means to melt and bond the seal layer (resin layer) of one exterior film and the seal layer (resin layer) of the other exterior film.

一般に、フィルム外装電池に用いられるラミネートフィルムは、例えば金属層として形成されガスバリア性を備えるバリア層を含んでいる。したがって、ラミネートフィルムを透過して、水分等が電池内部に侵入したり、あるいは逆に、内部の電解液が漏れたりすることはほとんどない。これに対して、外装フィルム同士を熱融着した封止部では、そのようなバリア層は設けられておらず、樹脂部材のみが存在した状態となっているため、この封止部を通じて（特に、この封止部の密閉性が損なわれている場合）、例えば水分などが電池内部に侵入するおそれもあった。   In general, a laminate film used for a film-clad battery includes a barrier layer that is formed, for example, as a metal layer and has gas barrier properties. Therefore, the laminated film hardly permeates moisture or the like into the battery or conversely leaks the electrolyte inside. On the other hand, in the sealing part in which the exterior films are heat-sealed, such a barrier layer is not provided, and only the resin member is present. In the case where the sealing property of the sealing portion is impaired), for example, moisture may enter the battery.

特許文献１には、この問題に鑑み、フィルム同士を熱融着した封止部に防水性のキャップ部材を取り付けるようにした構成が開示されている。
特開２００４−７９４３４号公報 In view of this problem, Patent Document 1 discloses a configuration in which a waterproof cap member is attached to a sealing portion in which films are heat-sealed.
JP 2004-79434 A

ところで、フィルム外装電池の包装体内に収容される電解液には、臭気成分であるジエチルカーボネート（DEC）等の成分が含まれていることもある。しかしながら、従来のフィルム外装電池の構成では、この臭気成分が、フィルム同士の封止部を透過して外部に放散されることがあった。特許文献１の構成のように、防水性のキャップ部材が封止部に取り付けられていたとしても、臭気成分は樹脂材料であるこのキャップ部材を透過するものと考えられる。   By the way, components such as diethyl carbonate (DEC), which is an odor component, may be contained in the electrolyte solution contained in the package of the film-clad battery. However, in the configuration of the conventional film-clad battery, this odor component may be transmitted to the outside through the sealing portion between the films. Even if a waterproof cap member is attached to the sealing portion as in the configuration of Patent Document 1, the odor component is considered to pass through the cap member, which is a resin material.

このような臭気成分の放散は、フィルム外装電池一個当たりにしてみれば非常に微量であるかもしれないが、組電池の場合、数十個程度の電池が使われることもあり、臭気成分の放散による問題はより顕在化する。   Such odor component emission may be very small if per film-covered battery, but in the case of an assembled battery, about several tens of batteries may be used, and odor component emission. The problem due to becomes more obvious.

以上、「電池」を例に挙げて本発明の課題について説明してきたが、上記のような課題は電池に限って生じるものではない。例えば、キャパシタとして構成されたものであったとしても、包装体の内部に臭気成分が収容されていれば、それがフィルム同士の封止部（接合部）を通じて放散される可能性があるためである。   As described above, the problem of the present invention has been described by taking the “battery” as an example, but the above-described problem is not limited to the battery. For example, even if it is configured as a capacitor, if an odor component is contained inside the package, it may be dissipated through the sealing part (joint part) between the films. is there.

本発明は上記のような問題点に鑑みてなされたものであり、その目的は、外装フィルムで構成された包装体内に封入された臭気成分が外部に放散されにくいフィルム外装電気デバイスおよびそれが集合した集合体を提供することにある。   The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a film-covered electrical device in which an odor component enclosed in a package composed of a package film is difficult to dissipate to the outside, and an assembly thereof. Is to provide an aggregate.

上記課題を解決するため、本発明のフィルム外装電気デバイスは、可撓性を有する外装フィルム同士がその周縁部で互いに接合されることによって形成された密閉空間内に、電気的エネルギーを貯留および出力するための電気デバイス要素が電解液と共に封入されたフィルム外装電気デバイスにおいて、前記外装フィルム同士が接合された封止部の端面を覆うように、ガスバリア性を備えた気密手段が前記周縁部の少なくとも一部に設けられていることを特徴とする。   In order to solve the above-mentioned problems, the film-covered electrical device of the present invention stores and outputs electrical energy in a sealed space formed by joining flexible exterior films to each other at their peripheral portions. In the film-clad electrical device in which the electrical device element for encapsulating with the electrolytic solution is provided, an airtight means having a gas barrier property is provided at least at the peripheral part so as to cover an end surface of the sealing part where the exterior films are joined to each other. It is provided in a part.

このような構成によれば、封止部の端面にガスバリア性の気密手段が設けられていることから、内部の臭気成分が、封止部を通じて外部に放散されることが防止される。「気密手段」としては、ガスバリア性を備えた気密層と接着層とを少なくとも含む封止テープであってもよい。また、封止部端面にガスバリア性を備えた薄膜（例えば金属膜など）が形成されていてもよく、このような構成によっても、臭気成分の放散が防止される。封止テープなどの追加の部材を利用しない例として、例えば、外装フィルムの一方の側縁が、他方の前記外装フィルムの側縁を覆い込むように折り返されていてもよい。   According to such a configuration, since the gas barrier airtight means is provided on the end face of the sealing portion, the internal odor component is prevented from being diffused to the outside through the sealing portion. The “airtight means” may be a sealing tape including at least an airtight layer having a gas barrier property and an adhesive layer. Further, a thin film (for example, a metal film) having a gas barrier property may be formed on the end face of the sealing portion, and the odor component is prevented from being diffused by such a configuration. As an example in which an additional member such as a sealing tape is not used, for example, one side edge of the exterior film may be folded back so as to cover the other side edge of the exterior film.

上述したように本発明によれば、封止部端部にガスバリア性の気密手段が設けられていることから、フィルム外装電気デバイス内部からの臭気成分の放散を防止することが可能となる。このようなフィルム外装電気デバイスは、例えば組電池など、多数のデバイスが同時に使用されるような場合に特に有利である。   As described above, according to the present invention, since the gas barrier airtight means is provided at the end of the sealing portion, it is possible to prevent odor components from being diffused from the inside of the film-covered electrical device. Such a film-clad electrical device is particularly advantageous when a large number of devices such as a battery pack are used simultaneously.

以下、図面を参照し、本発明の実施の形態について詳しく述べる。なお、以下の説明ではフィルム外装電池を本発明のフィルム外装電気デバイスの一例として説明するが、本発明は電池に限らずキャパシタ等として構成されたものであってもよい。
（第１の実施形態）
図１は、本発明の一実施形態のフィルム外装電池の全体構成を示す斜視図である。図２は図１のフィルム外装電池の上面図であり、図３は図１のA−A切断線における断面の一部を拡大して示す拡大断面図である。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, a film-clad battery is described as an example of a film-clad electrical device of the present invention, but the present invention is not limited to a battery and may be configured as a capacitor or the like.
(First embodiment)
FIG. 1 is a perspective view showing the overall configuration of a film-clad battery according to an embodiment of the present invention. 2 is a top view of the film-clad battery of FIG. 1, and FIG. 3 is an enlarged cross-sectional view showing a part of the cross section taken along the line AA of FIG.

図１、図２に示すように、本実施形態のフィルム外装電池２０は、可撓性を有する外装フィルム２４と、外装フィルムにより形成された密閉空間内に電解液とともに収容される電池要素２２とを有している。   As shown in FIGS. 1 and 2, the film-clad battery 20 of the present embodiment includes a flexible exterior film 24, and a battery element 22 that is housed together with an electrolyte in a sealed space formed by the exterior film. have.

電池要素２２は、例えば、この種のフィルム外装電池として一般に用いられるリチウムイオン二次電池等であり、電解液と共に封止されることによって所定の起電力を出力するものである。電池要素２２は、詳細には図示しないが、正極用および負極用の金属箔がセパレータを介して交互に積層されたものであり、その厚さは例えば数ｍｍから十数ｍｍ程度である。本実施形態では電池要素２２は、長方形の輪郭形状を有しており、その各短辺からは、引出し電極として、正極用の電極タブ２５ａと負極用の電極タブ２５ｂとが引き出されている。   The battery element 22 is, for example, a lithium ion secondary battery or the like generally used as this type of film-clad battery, and outputs a predetermined electromotive force by being sealed together with an electrolytic solution. Although not shown in detail, the battery element 22 is formed by alternately laminating positive and negative electrode metal foils via separators, and has a thickness of, for example, about several mm to several tens of mm. In the present embodiment, the battery element 22 has a rectangular outline shape, and from each short side, a positive electrode tab 25a and a negative electrode tab 25b are drawn out as lead electrodes.

電極タブ２５ａ、２５ｂはいずれも、厚さが例えば３００μｍ程度のシート状の金属薄板で構成されている。電極タブ２５ａ（正極用）の材質はアルミニウム又はアルミニウム合金等であり、電極タブ２５ｂ（負極用）の材質は銅又は合金等である。電極タブ２５ａの一端側は、電池要素２２の正極用の金属箔に電気的接続され、他端側は包装体の外部に延出している。同様にして電極タブ２５ｂも、その一端側が電池要素の負極用の金属箔に電気的接続され、他端側が外部に延出している。   Each of the electrode tabs 25a and 25b is formed of a sheet-like metal thin plate having a thickness of about 300 μm, for example. The material of the electrode tab 25a (for positive electrode) is aluminum or aluminum alloy, and the material of the electrode tab 25b (for negative electrode) is copper or alloy. One end side of the electrode tab 25a is electrically connected to the metal foil for the positive electrode of the battery element 22, and the other end side extends to the outside of the package. Similarly, one end side of the electrode tab 25b is electrically connected to the metal foil for the negative electrode of the battery element, and the other end side extends to the outside.

外装フィルム２４は、電池要素２２の輪郭形状に合わせて、その輪郭が長方形となっている。外装フィルム２４としては、図３に示すように、電池要素２２の図示上面側に配されたフィルム２４Ａと、図示下面側に配されたフィルム２４Ｂとの２枚が用いられている（以下、これらを区別することなく単に「外装フィルム２４」ともいう）。外装フィルム２４自体は、従来一般的なものを利用可能であり、本実施形態では中間層であるバリア層２６の両面に、熱融着性を備えたシール層２７と、絶縁性を備えた保護層２８とがそれぞれ積層された構成となっている。バリア層２６は金属薄膜として構成可能であり、保護層２５は例えばポリアミド系合成繊維等で構成可能である。   The outer film 24 has a rectangular outline in accordance with the outline shape of the battery element 22. As the exterior film 24, as shown in FIG. 3, two sheets of a film 24A disposed on the illustrated upper surface side of the battery element 22 and a film 24B disposed on the illustrated lower surface side are used (hereinafter referred to as these films). Are simply referred to as “exterior film 24” without distinction). As the exterior film 24 itself, a conventional one can be used, and in this embodiment, a sealing layer 27 having heat-fusibility and a protection having insulating properties are provided on both surfaces of the barrier layer 26 which is an intermediate layer. Each of the layers 28 is laminated. The barrier layer 26 can be configured as a metal thin film, and the protective layer 25 can be configured from, for example, a polyamide-based synthetic fiber.

本実施形態では、外装フィルム２４Ａ、２４Ｂの周縁部の全体にわたって封止部２３が形成されており（図２参照）、封止部２３では、一方の外装フィルム２４Ａのシール層２７と、他方の外装フィルム２４Ｂのシール層２７とが、熱融着により一体化した状態となっている（図３参照）。なお、「封止部２３」は、基本的にはこのようにシール層２７同士を接合した部位を意図するが、電極タブ２５ａ、２５ｂが挟み込まれた部位も含むものとする。   In this embodiment, the sealing part 23 is formed over the whole peripheral part of exterior film 24A, 24B (refer FIG. 2), and in the sealing part 23, the sealing layer 27 of one exterior film 24A and the other The sealing layer 27 of the exterior film 24B is in an integrated state by thermal fusion (see FIG. 3). The “sealing portion 23” basically intends a portion where the sealing layers 27 are joined together as described above, but also includes a portion where the electrode tabs 25a and 25b are sandwiched.

本実施形態の構成の主たる特徴部は、外装フィルム２４の周縁部にガスバリア性を備えた封止テープ３０が設けられている点にある。封止テープ３０は、図３に示すように、内側に接着層３１が形成され、外側にガスバリア性を備えた気密層３２が形成されたものである。気密層３２は金属膜（例としてアルミニウム箔）であることが好ましい。気密層３２を樹脂材料とした場合、内部の臭気成分が当該気密層を透過して外部に放散されるおそれがあるが、金属膜とすれば臭気成分が透過することはない。   The main characteristic part of the configuration of the present embodiment is that a sealing tape 30 having gas barrier properties is provided on the peripheral edge of the exterior film 24. As shown in FIG. 3, the sealing tape 30 has an adhesive layer 31 formed on the inner side and an airtight layer 32 having a gas barrier property formed on the outer side. The hermetic layer 32 is preferably a metal film (for example, an aluminum foil). When the airtight layer 32 is made of a resin material, the internal odor component may pass through the airtight layer and be emitted to the outside, but if it is made of a metal film, the odor component will not permeate.

上記の通り、本実施形態の構成によれば、外装フィルム同士を熱融着した封止部の端面を覆うようにガスバリア性の封止テープ３０が設けられていることから、封止部２３（特にシール層２７同士の接合部分）のガスバリア性が確保される。その結果、電池内部から、臭気成分が封止部を通じて外部に放散することが抑制される。   As described above, according to the configuration of the present embodiment, since the gas barrier sealing tape 30 is provided so as to cover the end surface of the sealing portion obtained by heat-sealing the exterior films, the sealing portion 23 ( In particular, the gas barrier property of the joint portion between the seal layers 27) is ensured. As a result, the odor component is prevented from being diffused from the inside of the battery through the sealing portion.

図１〜図３に示した構成は、外装フィルム２４の周縁部の全体にわたって封止テープ３０が設けられた例であったが、本発明はそれに限らず、封止テープ３０が周縁部の一部にのみ設けられた構成であってもよい。例えば、周縁部４辺のうち、２つの長辺のみにテープ３０が貼り付けられていてもよいし、封止部２３のうち、電極タブ２５ａ、２５ｂが挟み込まれた部位を除く残りの全領域にテープが貼り付けられていてもよい。封止テープ３０には、少なくとも臭気成分を透過させない、という機能が求められる。上記の通り気密層３２に金属材料を選択した場合、封止テープ３０はガスバリア性（気体非透過性）と液体非透過性との両方を備えることなる。したがって、当然ながら、臭気成分だけではなく、水分などの透過も防止することが可能である。   The configuration shown in FIGS. 1 to 3 is an example in which the sealing tape 30 is provided over the entire peripheral edge of the exterior film 24, but the present invention is not limited thereto, and the sealing tape 30 is a part of the peripheral edge. The structure provided only in the part may be sufficient. For example, the tape 30 may be affixed to only two long sides of the four peripheral edges, or the remaining entire area of the sealing portion 23 excluding the portion where the electrode tabs 25a and 25b are sandwiched. A tape may be affixed to. The sealing tape 30 is required to have a function of not allowing at least odor components to pass therethrough. When a metal material is selected for the airtight layer 32 as described above, the sealing tape 30 has both gas barrier properties (gas impermeable properties) and liquid impermeable properties. Therefore, as a matter of course, it is possible to prevent not only the odor component but also the transmission of moisture and the like.

（第２の実施形態）
本発明による作用効果をさらに高めるために、図４に示すように、封止部２３の端面にガスバリア性を備えた薄膜３５が形成されていてもよい。薄膜３５は金属箔膜であってもよく、例えば蒸着法により形成可能である。薄膜３５は端面の全域にわたって（すなわち、図４で言えば、各フィルムのバリア層２６、シール層２７、保護層２８の全てを覆うようにして）形成されていてもよいが、それに限定されるものではない。図４のように、少なくともシール層２７のみを覆うように形成されていてもよい。 (Second Embodiment)
In order to further enhance the operational effects of the present invention, a thin film 35 having a gas barrier property may be formed on the end face of the sealing portion 23 as shown in FIG. The thin film 35 may be a metal foil film, and can be formed by, for example, a vapor deposition method. The thin film 35 may be formed over the entire end face (that is, covering all of the barrier layer 26, the seal layer 27, and the protective layer 28 of each film in FIG. 4), but is not limited thereto. It is not a thing. As shown in FIG. 4, it may be formed so as to cover at least the sealing layer 27 alone.

（第３の実施形態）
封止部２３からの臭気成分の放散を抑制するためには、上述したような追加の封止テープ３０を利用する形態の他にも、例えば図５に示すような構成となっていてもよい。図５の構成では、外装フィルムの一方（２４Ｂ）が、他方の外装フィルム２４Ａの側縁を覆い込むように折り返されている。この構成の場合、外装フィルム２４Ｂのバリア層（金属層）が、実質的に、シール層２７同士の接合部を覆うこととなり、この部位からの臭気成分の放散が抑えられる。 (Third embodiment)
In order to suppress the emission of the odor component from the sealing portion 23, the configuration as shown in FIG. 5 may be used in addition to the configuration using the additional sealing tape 30 as described above. . In the configuration of FIG. 5, one of the exterior films (24B) is folded back so as to cover the side edge of the other exterior film 24A. In the case of this configuration, the barrier layer (metal layer) of the exterior film 24B substantially covers the joint between the seal layers 27, and the emission of odor components from this portion is suppressed.

なお、本実施形態の構成と、上記各実施形態の構成とを組み合わせて使用することも可能であり、例えば、折り返されたフィルム２４Ｂの端部のところに図３に示したような封止テープが貼り付けられていてもよい。   It is also possible to use the configuration of this embodiment in combination with the configuration of each of the above embodiments. For example, the sealing tape as shown in FIG. 3 at the end of the folded film 24B. May be affixed.

以上、第１〜第３の実施形態を例に挙げて本発明のフィルム外装電池について説明したが、本発明はそれらに限らず以下に述べるような構成も含む。   As mentioned above, although the film-clad battery of this invention was demonstrated taking the 1st-3rd embodiment as an example, this invention includes not only these but the structure as described below.

図６のフィルム外装電池２１は、封止部２３に安全弁４０が設けられたものである。一般に、この種のフィルム外装電池においては、異常時に包装体内部にガスが発生することがある。このガスによって包装体の不測の部位が破損するといったことを防ぐため、従来、封止部にガス放出用の安全弁を設けることが行われている。このような安全弁４０が設けられている構成では、封止部２３のうち、安全弁４０を除く領域に封止テープ３０が貼り付けられていればよい。   The film-clad battery 21 in FIG. 6 has a sealing part 23 provided with a safety valve 40. In general, in this type of film-clad battery, gas may be generated inside the package during an abnormality. In order to prevent the unexpected part of the package from being damaged by the gas, conventionally, a safety valve for releasing gas has been provided in the sealing portion. In the configuration in which such a safety valve 40 is provided, it is only necessary that the sealing tape 30 is attached to a region of the sealing portion 23 excluding the safety valve 40.

上述したフィルム外装電池は、図７のように集合させることで組電池として利用することができる。図７の構成はあくまで一例であるが、フィルム外装電池２０は樹脂材料からなるセルケース１５によって保持され、そのようなケース付きのフィルム外装電池２０が複数個重ねられている。電池２０同士は、互いの電極タブ２５ａ、２５ｂ同士が接続されることによって電気的に接続される。なお、接続の形態としては何ら限定されるものではなく、直列接続、並列接続、あるいはそれらの併用であってもよい。   The film-clad battery described above can be used as an assembled battery by being assembled as shown in FIG. Although the configuration of FIG. 7 is merely an example, the film-clad battery 20 is held by a cell case 15 made of a resin material, and a plurality of such film-clad batteries 20 with cases are stacked. The batteries 20 are electrically connected by connecting the electrode tabs 25a and 25b to each other. Note that the form of connection is not limited at all, and may be series connection, parallel connection, or a combination thereof.

本発明の一実施形態のフィルム外装電池の全体構成を示す斜視図である。It is a perspective view which shows the whole structure of the film-clad battery of one Embodiment of this invention. 図１のフィルム外装電池の上面図である。It is a top view of the film-clad battery of FIG. 図１のA−A切断線における断面の一部を拡大して示す拡大断面図である。It is an expanded sectional view which expands and shows a part of cross section in the AA cut line of FIG. 封止部における気密性を高めるための他の構成例を示す拡大断面図である。It is an expanded sectional view which shows the other structural example for improving the airtightness in a sealing part. 本発明の他の実施形態の構成を示す拡大断面図である。It is an expanded sectional view showing the composition of other embodiments of the present invention. 本発明のフィルム外装電池の他の構成例を示す上面図である。It is a top view which shows the other structural example of the film-clad battery of this invention. 複数のフィルム外装電池で構成された組電池の一例を示す斜視図である。It is a perspective view which shows an example of the assembled battery comprised with the some film exterior battery.

符号の説明Explanation of symbols

２０、２１ フィルム外装電池
２２ 電池要素
２３ 封止部
２４、２４Ａ、２４Ｂ 外装フィルム
２５ａ、２５ｂ 電極タブ
２６ バリア層
２７ シール層
２８ 保護層
３０ 封止テープ
３１ 接着層
３２ 気密層
３５ 薄膜
４０ 安全弁
６０ 組電池 20, 21 Film exterior battery 22 Battery element 23 Sealing portion 24, 24A, 24B Exterior film 25a, 25b Electrode tab 26 Barrier layer 27 Seal layer 28 Protective layer 30 Sealing tape 31 Adhesive layer 32 Airtight layer 35 Thin film 40 Safety valve 60 Set battery

Claims (5)

可撓性を有する外装フィルム同士がその周縁部で互いに接合されることによって形成された密閉空間内に、電気的エネルギーを貯留および出力するための電気デバイス要素が電解液と共に封入されたフィルム外装電気デバイスにおいて、
前記外装フィルム同士が接合された封止部の端面を覆うように、ガスバリア性を備えた気密手段が、前記周縁部の少なくとも一部に設けられていることを特徴とするフィルム外装電気デバイス。 An electric film element in which an electric device element for storing and outputting electric energy is enclosed with an electrolytic solution in a sealed space formed by bonding outer flexible films to each other at the peripheral edge thereof. On the device
A film-clad electrical device, wherein an airtight means having a gas barrier property is provided on at least a part of the peripheral part so as to cover an end face of the sealing part where the exterior films are bonded to each other. 前記気密手段は、ガスバリア性を備えた気密層と接着層とを少なくとも含む封止テープである、請求項１に記載のフィルム外装電気デバイス。   The film-clad electrical device according to claim 1, wherein the airtight means is a sealing tape including at least an airtight layer having a gas barrier property and an adhesive layer. 前記封止部の前記端面に、ガスバリア性を備えた薄膜が形成されている、請求項１または２に記載のフィルム外装電気デバイス。   The film-clad electrical device according to claim 1 or 2, wherein a thin film having gas barrier properties is formed on the end face of the sealing portion. 前記気密手段として、前記外装フィルムの一方の側縁が、他方の前記外装フィルムの側縁を覆い込むように折り返されている、請求項１に記載のフィルム外装電気デバイス。   The film-covered electrical device according to claim 1, wherein as the airtight means, one side edge of the exterior film is folded back so as to cover the other side edge of the exterior film. 請求項１から４のいずれか１項に記載のフィルム外装電池を、少なくとも２つ以上電気的に接続して構成される電気デバイス集合体。   An electric device assembly configured by electrically connecting at least two film-clad batteries according to any one of claims 1 to 4.
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