JP3632054B2 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
JP3632054B2
JP3632054B2 JP12508397A JP12508397A JP3632054B2 JP 3632054 B2 JP3632054 B2 JP 3632054B2 JP 12508397 A JP12508397 A JP 12508397A JP 12508397 A JP12508397 A JP 12508397A JP 3632054 B2 JP3632054 B2 JP 3632054B2
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Prior art keywords
secondary battery
lead terminal
external electrode
electrode lead
power generation
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JPH10302738A (en
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洋之 家地
利幸 大澤
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Ricoh Co Ltd
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Ricoh Co 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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  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、２次電池に関する。
【０００２】
【従来の技術】
近年のエレクトロニクス分野の発展はめざましく、電子機器の小型化、軽量化、高性能化の要求が著しい。電子機器の心臓と言われる小型２次電池には、単位体積当たりまたは単位重量当たりのエネルギー密度が大きく且つ長寿命の電池の開発が望まれている。これらの小型２次電池は、増々発展する携帯電話、小型ＯＡ機器、小型通信機などに対する用途展開が期待されている。
従来、ハンディタイプのビデオカメラやコードレス電話や携帯電話等の電子機器等には電源供給用の種々形式の１次電池或いは２次電池が搭載されている。充電して繰り返して利用可能な２次電池をこれら電子機器等に搭載する場合には電子機器等或いは充電器等への脱着を容易にするために単数或いは複数の２次電池等を１つのケースに納めた電池装置が使用されている。この電池装置は樹脂材料などからなるおおむね直方体状に形成される電池容器と電池容器内に収納される単数或いは複数の充電放電可能な陽極、陰極及び電解質からなる２次電池発電要素により構成されている。この２次電池発電要素は、図１に示すように、正極板１１と負極板１２とをセパレータ１３で袋詰めして交互に重ね合わせることによって形成される。そして、この正極板１１と負極板１２とを袋状のセパレータ１３からなる積層体を概ね長方体のバッテリーケースに挿入して電解液を注入するかまたはポリマー電解質を正極板１１と負極板１２の間に形成することによって２次電池本体を形成する。電流の取り出しは正極板に続く正極端子１１ａ、及び負極板に続く負極端子１２ｂによりおこなう。
従来、薄型電池はその厚みを極力薄くするために扁平な発電要素を金属箔と熱融着性樹脂フィルムのラミネートフィルム（外装フィルム）で液密、気密に外装している。とくに有機電解質を用いた発電要素の場合には外気中の水分が電池要素内への浸入や電解液が外に漏洩により性能劣化が大きいことが指摘されており、この問題を解決するために数々の提案がなされている。たとえば図２、図３、図４は、それぞれ負極側のラミネートフィルムと正極板のラミネートフィルムとの発電要素の周縁部外方のアイオノマー樹脂フィルム７同士の接合部をインパルスシーラー等の熱融着装置で加熱し、熱融着することで封止し、さらにその外側を熱硬化性樹脂９によって被覆するもの（特開昭６０−４９５６８）、電極リード体４、５の封止部分にあらかじめアイオノマー樹脂６を被覆するもの（特開昭６０−６５４４２）、電池内部を減圧状態に出来るようにした構造にするもの（特開昭６０−１１７５４２）が知られている。
しかしながら、従来技術により融着を確実に行ったとしても、図５（ａ）のＡ−Ａ′の断面である図５（ｂ）が示すように、電極リード体５とラミネートフィルム６の界面に凹凸が出来るために接着部から発電要素への水分の侵入を完全に防ぐことは困難であった。また、封止した外側を熱硬化性樹脂によって被覆した場合には電池の重量、体積ともに増加するので単位重量、単位体積当たりのエネルギー容量が低下してしまうという欠点があった。したがって、外気中の水分の発電要素への侵入や電解液の外気へ漏洩による性能劣化しまうために実質的に重負荷特性、低温特性、サイクル特性等が悪くなって電池性能を悪化させるという不具合があった。
【０００３】
【発明が解決しようとする課題】
本発明の課題は、電極リード体をラミネートフィルムで接着する際に、電極リード体とラミネートフィルム界面に凹凸ができないようにし、外気中の水分が電池内に浸入したり電解液が外に漏洩することを防止できる電池を提供することにある。
【０００４】
【課題を解決するための手段】
本発明によれば、正極板と負極板とがセパレータおよび電解質層を介して交互に対向して重ねられている２次電池発電要素から構成される２次電池において、少なくとも一対の金属箔と熱融着性樹脂フィルムからなるラミネートフィルムにより二次電池発電要素包み被う際に、を熱融着樹脂フィルム側を２次電池発電要素側にし、２次電池発電要素の周縁部外方の熱融着樹脂フィルムの接合部を熱融着させることにより封止し、正極板と負極板に続く、該正極板及び該負極板の幅と略同一幅の外部電極リード端子を、該リード端子のみを露出させる切取線を設けたラミネートフィルムにより包み被うことを特徴とする２次電池が提供される。
【０００５】
【発明の実施の形態】
本発明による電池装置を図面により詳細に説明する。図８は本発明の正極板と負極板の構造を示している。正極板１１にアルミニウム箔３１を超音波溶接により接続し、正極板の間には負極板１２にニッケル箔３２をスポット溶接したものを挟んだ構造を示している。図９は図８のＡ−Ａ´の断面図である。正極板１１はたとえば厚さ２０ミクロンのアルミニウム箔よりなる集電体２１の両面にリチウムと遷移金属の複合酸化物たとえばＬｉＶ2Ｏ5やＬｉＣｏＯ2を正極活物質２２として塗布したもので、長さが略１００ｍｍ、巾が略４５ｍｍである。セパレータ１３は、たとえば２５ミクロン厚の多孔性ポリエチレンフィルやポリプロピレンフィルム等を袋状にした形態である。袋詰めは２枚の正極板１１よりもやや大きなセパレータで正極板１１を挟んで正極板の中心線に対して軸対称になる位置で、４隅は融着させている。負極板１２は、たとえば厚さ１０ミクロンの銅箔集電体２３の両面にリチウムをドープ、脱ドープ可能なカーボン、たとえばグラファイト構造を有する炭素や軟黒鉛化炭素材料等の炭素を負極活物質２４として塗布したものである。その長さは略１００ｍｍ、巾が略４５ｍｍである。セパレータ１３は、たとえば２５ミクロン厚の多孔性ポリエチレンフィルムやポリプロピレンフィルム等を袋状にした形態である。正極板１１、セパレータ１３、負極板１２の間には電解質層２５が形成されている。アルミニウム箔よりなる集電体２１にはアルミニウム箔３１が超音波溶接され、超音波溶接部３３が形成されている。銅箔集電体２３にはニッケル箔３２がスポット溶接部３４されスポット溶接部３４が形成される。この２次電池発電要素には正極の金属リード体としてのアルミニウム箔３１、及び負極の金属リード体としてのニッケル箔３２がアイオノマー樹脂（熱融着樹脂フィルム）からなるラミネートフィルムにより熱融着されている。図６は本発明の２次電池の使用前の外装である。２次電池発電要素はラミネートフィルム４１により包まれている。正極、負極に続く外部リード端子部の直上には、材質は特に規定されないが、ポリエチレン、エチレン重合体等からなるフィルムの製剥離用切り取り案内フィルム（剥離用切り取り案内テープ）４２が設けられており、その端部にラミネートフィルムの取出し部が設けられている切り取り案内テープ（切り取りを案内するためのテープ）の形状は外部リード端子よりも小さな形状でラミネートフィルムには剥離のために切取線４３が設けられている。図７は、切り取り案内テープ４２をラミネートフィルムの切り取り線４３にしたがって、ラミネートフィルムから切り取った後の切取口４４の状態を示している。図１０は、図７のＣ−Ｃ´断面を示す図である。この図では切取口４４が、２次電池発電要素を包むラミネートフィルム４１の少なくとも対向する同一辺上（２次電池発電要素の両端に存在する外部電極リード端子部の同一片面側：図１０では上面側）に設けられている。Ｂは発電要素である。図１１は、切取口４４が、２次電池発電要素を包むラミネートフィルム４１の対向する両側辺上に設けたられた（切取口４４が、２次電池発電要素の両端に存在する外部電極リード端子部の両面側：図１１では上面側及び下面側に設けられた）ものである。Ｂは発電要素である。図１２は、切取口４４が、２次電池発電要素を包むラミネートフィルム４１の片側辺上に正極外部電極リード端子３１と負極外部電極リード端子３０が対向して設けられた（ラミネートフィルムの切取線が、正極外部電極リード端子側及び負極外部電極リード端子側の両面側：図１２では上面側及び下面側に設けられた）ものである。図１３は、切取口４４が、２次電池発電要素を包むラミネートフィルム４１の少なくとも片側の同一面上に設けられた（ラミネートフィルムの切取線が、正極外部電極リード端子及び負極外部電極リード端子と同じ面側：図１３では上面側に設けられた）ものである。図１４は、切取口４４が、２次電池発電要素を包むラミネートフィルム４１の両側の面上に対向して設けられた（ラミネートフィルムの切取線が、正極外部電極リード端子及び負極外部電極リード端子の異なる面側：図１４では上面側及び下面側に設けられた）ものである。
【０００６】
【発明の効果】
本発明は、正極板と負極板とがセパレータおよび電解質を介して交互に対向して重ねられて成る２次電池において、少なくとも一対のアルミニウム箔と熱融着性樹脂フィルムからなるラミネートフィルムにより包み被う際に熱融着樹脂フィルムを２次電池発電要素側（内側）にし、電池発電要素の周縁部外方の熱融着樹脂フィルム同士を熱融着して封止し、正極の金属リード体がアルミニウム箔、負極の金属リード体がニッケル箔であり、これらに続く外部電極リード端子がラミネートフィルムで包み被われるようにしたので、電極リード体とラミネートフィルム界面に凹凸が生ずることを無くすことが出来る。その結果接着部から電池の内部の発電要素側への水分の侵入及び電解液の漏洩を防ぐことが出来る。
【図面の簡単な説明】
【図１】従来の扁平型薄型電池の発電要素を示す斜視図
【図２】従来の薄型電池を示す図
【図３】従来の薄型電池を示す図
【図４】従来の薄型電池を示す図
【図５】従来の扁平型薄型電池の外部リード部を示す図
【図６】本発明の使用前の電池を示す斜視図
【図７】本発明の使用時の電池を示す斜視図
【図８】本発明の発電要素を示す図
【図９】本発明の発電要素の断面図
【図１０】本発明の具体例を示す図
【図１１】本発明の具体例を示す図
【図１２】本発明の具体例を示す図
【図１３】本発明の具体例を示す図
【図１４】本発明の具体例を示す図
【符号の説明】
４ 電極リード体
５ 電極リード体
６ アイオノマー樹脂
７ アイオノマー樹脂
１１ 正極板
１１ａ 正極板リード板
１２ 負極板
１２ａ 負極板リード板
１３ セパレータ
２１ 集電体
２２ 正極活物質
２３ 集電体
２４ 負極活物質
２５ 電解質層
３１ アルミニウム箔
３２ ニッケル箔
３３ 超音波溶接部
３４ スポット溶接部
４１ ラミネートフィルム
４２ 剥離用切り取り案内テープ
４３ 切取線
４４ 切取口[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a secondary battery.
[0002]
[Prior art]
The development of the electronics field in recent years is remarkable, and the demand for downsizing, weight reduction, and high performance of electronic devices is remarkable. Development of a battery having a large energy density per unit volume or unit weight and a long life is desired for a small secondary battery called the heart of an electronic device. These small secondary batteries are expected to be used for mobile phones, small OA devices, small communication devices, and the like that are increasingly developed.
Conventionally, various types of primary batteries or secondary batteries for power supply are mounted on handheld video cameras, electronic devices such as cordless phones and mobile phones. When a secondary battery that can be repeatedly charged and used is mounted on these electronic devices, etc., one or more secondary batteries are placed in one case in order to facilitate attachment / detachment to / from the electronic device or charger. The battery device stored in is used. This battery device is composed of a battery container made of a resin material or the like and formed into a substantially rectangular parallelepiped shape, and a secondary battery power generation element made up of one or a plurality of chargeable / dischargeable anodes, cathodes and electrolytes housed in the battery container. Yes. As shown in FIG. 1, the secondary battery power generation element is formed by packing positive electrode plates 11 and negative electrode plates 12 with a separator 13 and alternately superposing them. Then, the positive electrode plate 11 and the negative electrode plate 12 are laminated with a bag-like separator 13 in a substantially rectangular battery case and an electrolyte is injected, or a polymer electrolyte is added to the positive electrode plate 11 and the negative electrode plate 12. A secondary battery body is formed by forming between the two. The current is taken out by the positive electrode terminal 11a following the positive electrode plate and the negative electrode terminal 12b following the negative electrode plate.
Conventionally, in order to reduce the thickness of a thin battery as much as possible, a flat power generating element is liquid-tight and air-tightly covered with a laminate film (exterior film) of a metal foil and a heat-fusible resin film. In particular, in the case of power generation elements using organic electrolytes, it has been pointed out that moisture in the outside air has entered the battery element and leakage of electrolyte solution has caused significant performance degradation. Proposals have been made. For example, FIG. 2, FIG. 3 and FIG. 4 show a heat-sealing device such as an impulse sealer for joining the joints between the ionomer resin films 7 on the outer periphery of the power generation element of the laminate film on the negative electrode side and the laminate film on the positive electrode plate, respectively. The resin is sealed by heating and heat-sealing, and the outer side thereof is covered with a thermosetting resin 9 (Japanese Patent Laid-Open No. 60-49568), and the ionomer resin is previously applied to the sealing portions of the electrode lead bodies 4 and 5 6 is known (Japanese Patent Laid-Open No. 60-65442), and a structure in which the inside of the battery can be decompressed (Japanese Patent Laid-Open No. 60-117542) is known.
However, even if the fusion is reliably performed by the conventional technique, as shown in FIG. 5B, which is a cross section taken along the line AA ′ of FIG. 5A, the interface between the electrode lead body 5 and the laminate film 6 is shown. Due to the unevenness, it was difficult to completely prevent moisture from entering the power generation element from the bonded portion. In addition, when the sealed outer side is covered with a thermosetting resin, both the weight and volume of the battery increase, so that there is a disadvantage that the energy capacity per unit weight and unit volume is lowered. Therefore, since the performance deteriorates due to the intrusion of moisture in the outside air into the power generation element and the leakage of the electrolyte to the outside air, there is a problem that the heavy load characteristics, the low temperature characteristics, the cycle characteristics, etc. are substantially deteriorated and the battery performance is deteriorated. there were.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to prevent unevenness at the interface between the electrode lead body and the laminate film when bonding the electrode lead body with a laminate film, so that moisture in the outside air enters the battery or the electrolyte leaks outside. The object is to provide a battery that can prevent this.
[0004]
[Means for Solving the Problems]
According to the present invention, in a secondary battery composed of a secondary battery power generation element in which a positive electrode plate and a negative electrode plate are alternately stacked opposite to each other via a separator and an electrolyte layer , at least a pair of metal foil and heat When the secondary battery power generation element is covered with a laminate film made of a fusible resin film, the heat fusion resin film side is set to the secondary battery power generation element side, and heat fusion outside the peripheral portion of the secondary battery power generation element is performed. Sealing is performed by heat-sealing the bonding portion of the resin film, and the external electrode lead terminal having the same width as the positive electrode plate and the negative electrode plate is connected to the positive electrode plate and the negative electrode plate , and only the lead terminal is connected. A secondary battery is provided which is covered with a laminate film provided with a cut line to be exposed .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The battery device according to the present invention will be described in detail with reference to the drawings. FIG. 8 shows the structure of the positive electrode plate and the negative electrode plate of the present invention. A structure is shown in which an aluminum foil 31 is connected to the positive electrode plate 11 by ultrasonic welding, and a nickel plate 32 is spot-welded to the negative electrode plate 12 between the positive electrode plates. FIG. 9 is a cross-sectional view taken along the line AA ′ of FIG. The positive electrode plate 11 is obtained by applying a composite oxide of lithium and transition metal such as LiV 2 O 5 or LiCoO 2 as the positive electrode active material 22 on both surfaces of a current collector 21 made of an aluminum foil having a thickness of 20 microns, for example. Is approximately 100 mm and the width is approximately 45 mm. The separator 13 has a bag-like form made of, for example, a 25-micron-thick porous polyethylene film or polypropylene film. In the bagging, the four corners are fused at positions that are axisymmetric with respect to the center line of the positive electrode plate with the positive electrode plate 11 sandwiched between separators slightly larger than the two positive electrode plates 11. The negative electrode plate 12 is made of, for example, carbon that can be doped and dedoped with lithium on both sides of a copper foil current collector 23 having a thickness of 10 microns, such as carbon having a graphite structure or carbon such as a soft graphitized carbon material. As applied. The length is about 100 mm and the width is about 45 mm. Separator 13 is in the form of a bag made of, for example, a 25-micron thick porous polyethylene film or polypropylene film. An electrolyte layer 25 is formed between the positive electrode plate 11, the separator 13, and the negative electrode plate 12. An aluminum foil 31 is ultrasonically welded to the current collector 21 made of aluminum foil, and an ultrasonic weld 33 is formed. Nickel foil 32 is spot welded on the copper foil current collector 23 to form a spot weld 34. In this secondary battery power generation element, an aluminum foil 31 as a positive metal lead body and a nickel foil 32 as a negative metal lead body are heat-sealed by a laminate film made of an ionomer resin (heat-fusion resin film). Yes. FIG. 6 is an exterior before the secondary battery of the present invention is used. The secondary battery power generation element is wrapped with a laminate film 41. Although the material is not particularly defined immediately above the external lead terminal portion following the positive electrode and the negative electrode, there is provided a film peeling guide film (peeling tape for peeling) 42 made of polyethylene, ethylene polymer or the like. The cut-out guide tape (tape for guiding cut-out) provided with a laminate film take-out portion at its end is smaller than the external lead terminal, and the laminate film is provided with a cut-out line 43 for peeling. It has been. FIG. 7 shows the state of the cut-out opening 44 after the cut-out guide tape 42 has been cut out from the laminate film according to the cut-out line 43 of the laminate film. FIG. 10 is a view showing a cross section taken along the line CC ′ of FIG. In this figure, the cut-out opening 44 is on at least the same side of the laminate film 41 that encloses the secondary battery power generation element ( on the same side of the external electrode lead terminal portions existing at both ends of the secondary battery power generation element: the upper surface in FIG. 10). Side) . B is a power generation element. FIG. 11 shows that the cutouts 44 are provided on opposite sides of the laminate film 41 that encloses the secondary battery power generation element (the cutouts 44 are external electrode lead terminals that exist at both ends of the secondary battery power generation element. Both sides of the part: provided on the upper surface side and the lower surface side in FIG. B is a power generation element. In FIG. 12, the cutout port 44 is provided with the positive electrode external electrode lead terminal 31 and the negative electrode external electrode lead terminal 30 facing each other on one side of the laminate film 41 that wraps the secondary battery power generation element (the cut line of the laminate film is , Both sides of the positive external electrode lead terminal side and the negative external electrode lead terminal side: provided on the upper surface side and the lower surface side in FIG. In FIG. 13, the cutout opening 44 is provided on the same surface of at least one side of the laminate film 41 that encloses the secondary battery power generation element (the cutout line of the laminate film is the same as that of the positive external electrode lead terminal and the negative external electrode lead terminal). Surface side: provided on the upper surface side in FIG. In FIG. 14, the cut-out opening 44 is provided on both surfaces of the laminate film 41 that encloses the secondary battery power generation element (the cut-out line of the laminate film is connected to the positive external electrode lead terminal and the negative external electrode lead terminal). Different surface side: provided on the upper surface side and the lower surface side in FIG.
[0006]
【The invention's effect】
The present invention relates to a secondary battery in which a positive electrode plate and a negative electrode plate are alternately stacked opposite to each other via a separator and an electrolyte, and is covered with a laminate film composed of at least a pair of aluminum foil and a heat-fusible resin film. In this case, the heat fusion resin film is placed on the side of the secondary battery power generation element (inside), and the heat fusion resin films outside the peripheral edge of the battery power generation element are heat-sealed and sealed, and the metal lead body of the positive electrode Is made of aluminum foil and the metal lead body of the negative electrode is nickel foil, and the subsequent external electrode lead terminals are covered with a laminate film, so that it is possible to eliminate unevenness at the interface between the electrode lead body and the laminate film. I can do it. As a result, it is possible to prevent moisture from entering the power generation element inside the battery and leakage of the electrolyte from the adhesion portion.
[Brief description of the drawings]
1 is a perspective view showing a power generation element of a conventional flat thin battery. FIG. 2 is a view showing a conventional thin battery. FIG. 3 is a view showing a conventional thin battery. FIG. 4 is a view showing a conventional thin battery. FIG. 5 is a view showing an external lead portion of a conventional flat thin battery. FIG. 6 is a perspective view showing a battery before use of the present invention. FIG. 7 is a perspective view showing a battery in use of the present invention. FIG. 9 is a sectional view of the power generating element of the present invention. FIG. 10 is a diagram illustrating a specific example of the present invention. FIG. 11 is a diagram illustrating a specific example of the present invention. FIG. 13 shows a specific example of the present invention. FIG. 14 shows a specific example of the present invention. FIG. 14 shows a specific example of the present invention.
DESCRIPTION OF SYMBOLS 4 Electrode lead body 5 Electrode lead body 6 Ionomer resin 7 Ionomer resin 11 Positive electrode plate 11a Positive electrode plate lead plate 12 Negative electrode plate 12a Negative electrode plate lead plate 13 Separator 21 Current collector 22 Positive electrode active material 23 Current collector 24 Negative electrode active material 25 Electrolyte Layer 31 Aluminum foil 32 Nickel foil 33 Ultrasonic welded part 34 Spot welded part 41 Laminate film 42 Cut-off guide tape 43 Cut-off line 44 Cut-out opening

Claims (10)

正極板と負極板とがセパレータおよび電解質層を介して交互に対向して重ねられている２次電池発電要素から構成される２次電池であって、少なくとも一対の金属箔と熱融着性樹脂フィルムからなるラミネートフィルムにより二次電池発電要素を包み被う際に、熱融着樹脂フィルム側を２次電池発電要素側にして、２次電池発電要素の周縁部外方に位置する熱融着樹脂フィルムの接合部を熱融着させることにより封止し、正極板と負極板に続く、該正極板及び該負極板の幅と略同一幅の外部電極リード端子を、該リード端子のみを露出させる切取線を設けたラミネートフィルムにより包み被うことを特徴とする２次電池。A secondary battery comprising a secondary battery power generation element in which a positive electrode plate and a negative electrode plate are alternately stacked opposite to each other with a separator and an electrolyte layer interposed therebetween, at least a pair of metal foil and a heat-fusible resin When the secondary battery power generation element is wrapped with a laminate film made of a film, the heat fusion resin film side is set to the secondary battery power generation element side, and the heat fusion located outside the peripheral edge of the secondary battery power generation element The resin film joint is sealed by heat-sealing, and the external electrode lead terminal having the same width as that of the positive electrode plate and the negative electrode plate is exposed after the positive electrode plate and the negative electrode plate, and only the lead terminal is exposed. A secondary battery which is covered with a laminate film provided with a cutoff line. 金属箔がアルミニウム箔であることを特徴とする請求項１に記載の２次電池。The secondary battery according to claim 1, wherein the metal foil is an aluminum foil. 外部電極リード端子の正極がアルミニウム箔、負極がニッケル箔であることを特徴とする請求項１又は２に記載の２次電池。The secondary battery according to claim 1 or 2, wherein the positive electrode of the external electrode lead terminal is an aluminum foil and the negative electrode is a nickel foil. 少なくとも一対の金属箔と熱融着樹脂フィルムを有するラミネートフィルムの熱融着性樹脂フィルムがアイオノマー樹脂であることを特徴とする請求項１から３に記載のいずれかである２次電池。The secondary battery according to any one of claims 1 to 3, wherein the heat-fusible resin film of the laminate film having at least a pair of metal foils and a heat-fusing resin film is an ionomer resin. ラミネートフィルムで包み被われている外部電極リード端子部のラミネートフィルムに切取線を設けたことを特徴とする請求項１〜４に記載のいずれかである２次電池。The secondary battery according to any one of claims 1 to 4, wherein a cut line is provided in the laminate film of the external electrode lead terminal portion that is wrapped with the laminate film. ラミネートフィルムの切取線の真下に、該切取線で囲まれたラミネートフィルムを切り取るための切り取り案内テープを配置したことを特徴とする請求項５に記載の２次電池。6. The secondary battery according to claim 5 , wherein a cut guide tape for cutting the laminate film surrounded by the cut line is disposed immediately below the cut line of the laminate film . 正極外部電極リード端部が２次電池発電要素の一端に存在し、かつ負極外部電極リード端子が２次電池発電要素の他端に存在しており、ラミネートフィルムの切取線が、該正極外部電極リード端子及び該負極外部電極リード端子のそれぞれの同一片面側又は両面側に設けられていることを特徴とする請求項５に記載の２次電池。 The end of the positive electrode external electrode lead exists at one end of the secondary battery power generation element, and the negative electrode external electrode lead terminal exists at the other end of the secondary battery power generation element. The secondary battery according to claim 5, wherein the secondary battery is provided on the same single side or both sides of the terminal and the negative electrode external electrode lead terminal . 正極外部電極リード端子及び負極外部電極リード端子が共に２次電池発電要素の一端に存在しており、ラミネートフィルムの切取線が、該正極外部電極リード端子及び該負極外部電極リード端子のそれぞれの両面側に設けられていることを特徴とする請求項５に記載の２次電池。 Both the positive electrode external electrode lead terminal and the negative electrode external electrode lead terminal are present at one end of the secondary battery power generation element, and the cut line of the laminate film is on both sides of the positive electrode external electrode lead terminal and the negative electrode external electrode lead terminal. The secondary battery according to claim 5, wherein the secondary battery is provided in the battery. 正極外部電極リード端子及び負極外部電極リード端子が共に２次電池発電要素の片面側に存在しており、ラミネートフィルムの切取線が、該正極外部電極リード端子及び該負極外部電極リード端子のそれぞれの同一片面側に設けられていることを特徴とする請求項５に記載の２次電池。 Both the positive external electrode lead terminal and the negative external electrode lead terminal are present on one side of the secondary battery power generation element, and the cut line of the laminate film is the same for each of the positive external electrode lead terminal and the negative external electrode lead terminal. The secondary battery according to claim 5, wherein the secondary battery is provided on one side . 正極外部電極リード端子及び負極外部電極リード端子が２次電池発電要素の異なる面側に存在しており、ラミネートフィルムの切取線が、該正極外部電極リード端子及び該負極外部電極リード端子のそれぞれの両面側に設けられていることを特徴とする請求項５に記載の２次電池。 The positive electrode external electrode lead terminal and the negative electrode external electrode lead terminal are present on different surfaces of the secondary battery power generation element, and the cut line of the laminate film is formed on both surfaces of the positive electrode external electrode lead terminal and the negative electrode external electrode lead terminal. The secondary battery according to claim 5, wherein the secondary battery is provided on a side .
JP12508397A 1997-04-28 1997-04-28 Secondary battery Expired - Fee Related JP3632054B2 (en)

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