JPH07169453A - Battery - Google Patents

Abstract

PURPOSE:To provide a battery satisfying market requirements, Which is lightweight, small, thin, high capacity, long life, and low cost by arranging a nonporous current collector on the outside and using a resin film covered with a metal layer as a current collector of each electrode on the inside. CONSTITUTION:A battery element comprising an internal positive current collector 5 made of a resin film 7 with a metal coating layer 6 in which a positive active material 8 is held, a separator 9, and an internal negative current collector 15 made of a resin film 13 with a metal coating layer 14 in which a negative active material 16 is held is arranged between a flat plate positive current collector 20 also serving as a nonporous outer jacket and a negative current collector 23 also serving as a nonporous outer jacket. At least parts of edges of the metal coating layers 6, 14 are electrically connected to the inner surfaces of the outer jackets 20, 23 of the same polarity. The peripheries of the outer jackets 20, 23 are sealed with a sealing material 21 also serving as an electric insulator to airtightly seal a battery.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、エレクトロニクス機
器、電気自動車、玩具、アクセサリ−、表示器具、非常
用電源、携帯用機器などの分野に使用される電池に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery used in the fields of electronic equipment, electric vehicles, toys, accessories, display devices, emergency power supplies, portable equipment and the like.

【０００２】[0002]

【従来の技術】従来の電池は図７の斜視図に示されるよ
うに、正極集電体１の一部に突起状の端子部１’が設け
られ、同様に負極集電体２にも同様な突起状の端子部
２’が設けられている。これらの集電体の内側周縁域に
電気的絶縁体を兼ねる封口材として窓枠状の接着材３が
配置されている。電池４はそれらの集電体の間に正極活
物質、セパレ−タ、負極活物質などを配置し、接着材３
により密閉されている。このような電池４の電池容量を
大きくする場合には、電池面積を大きくしたり、活物質
の厚さを厚くしたり、電池４を積層し並列接続したりす
るなどしていた。外部で端子部同士を接続していた場合
には電池全体の大きさが大きくなる問題があった。しか
しながら、市場においては軽量、小型、薄型、大容量、
高寿命、低価格、高保存性能、信頼性が高いなどの要求
があり、これらすべての要求を満足する電池は得られて
いない。また今後、情報通信網、情報処理システム、携
帯用機器などが発達する上で益々上記特性を有する電池
の要求が期待される。しかしながら市場からの要望の大
きい、例えば図６に示す薄形のリチウム電池では大容
量、低価格を達成することが難しい。2. Description of the Related Art In a conventional battery, as shown in a perspective view of FIG. 7, a positive electrode current collector 1 is provided with a projecting terminal portion 1 ', and similarly, a negative electrode current collector 2 is also provided. The protrusion-shaped terminal portion 2'is provided. A window frame-shaped adhesive material 3 is disposed as a sealing material that also serves as an electrical insulator in the inner peripheral region of these current collectors. In the battery 4, a positive electrode active material, a separator, a negative electrode active material, etc. are arranged between the current collectors, and the adhesive 3
It is sealed by. In order to increase the battery capacity of such a battery 4, the battery area is increased, the thickness of the active material is increased, or the batteries 4 are stacked and connected in parallel. If the terminals are connected to each other externally, there is a problem that the size of the entire battery becomes large. However, in the market, lightweight, small, thin, large capacity,
There are demands for long life, low price, high storage performance, high reliability, etc., and batteries satisfying all these demands have not been obtained. Further, in the future, with the development of information communication networks, information processing systems, portable devices, and the like, demands for batteries having the above characteristics are expected more and more. However, it is difficult to achieve a large capacity and a low price with a thin lithium battery shown in FIG. 6, which is greatly demanded by the market.

【０００３】[0003]

【発明が解決しようとする課題】本発明は上記問題点に
鑑みてなされたものであって、その目的とするところは
市場要求に合致する軽量、小型、薄型、大容量、高寿
命、低価格などの要求を満たす電池を提供することにあ
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to achieve light weight, small size, thin shape, large capacity, long life, and low price that meet the market demand. To provide batteries that meet such requirements.

【０００４】[0004]

【課題を解決するための手段】本発明は上記目的を達成
するもので、相対する平板状で非孔質性の外装体を兼ね
る正極集電体と負極集電体の間に、正極活物質を保持し
た金属被覆層を有する樹脂フィルムからなる正極集電体
（以下、内部正極集電体という。）、セパレ−タ、負極
活物質を保持した金属被覆層を有する樹脂フィルムから
なる負極集電体（以下、内部負極集電体という。）など
からなる電池要素を配置すると共に、該金属被覆層の少
なくとも端部の一部を同極の外装体の内面に電気的に接
続し、且つ外装体の周縁域を電気絶縁を兼ねる封口材、
例えば接着材により封止し気密密閉したこと、前記電池
要素が帯状に形成され、折り畳まれて前記外装体内に収
納されていること、前記金属被覆層が多孔質であるこ
と、前記内部集電体の内面に一定パタ−ンで活物質を配
置すること 前記電池要素の少なくとも折り曲げ部分に
電気絶縁材、例えば接着剤、各種ゴム系有機物質、フィ
ラ−含有有機物質などを配置すること、前記折り曲げ回
数が偶数回であること、前記金属被覆層が接着、印刷、
蒸着、メッキなどにより被覆されたものであって、厚さ
が約３０μ以下であること、前記金属被覆層が一定パタ
−ンに形成されていること、前記金属被覆層の一部に過
電流が流れる場合に溶断する部分（以下、ヒュ−ズ部と
いう。）を設けたこと、前記電気的接続が導電性材料に
よる接合により行われること、前記折り曲げ部分にあら
かじめ折り目、例えばスリット、ミシン目など、又は活
物質を配置せず薄くすること、前記パタ−ンとパタ−ン
の間に折り曲げ域を設けたこと、前記導電性材料が導電
性微粉末と樹脂の混合物であること、前記電池内部が減
圧状態であること及び前記内部正極集電体の樹脂フィル
ムと内部負極集電体の樹脂フィルムを互いに接着したこ
となどを特徴とし、これらにより上述の問題点を解決す
るものである。Means for Solving the Problems The present invention achieves the above-mentioned object. A positive electrode active material is provided between opposing positive electrode current collectors and negative electrode current collectors, which also serve as non-porous outer casings. A positive electrode current collector (hereinafter referred to as an internal positive electrode current collector) made of a resin film having a metal coating layer holding a separator, a separator, and a negative electrode current collector made of a resin film having a metal coating layer holding a negative electrode active material. A battery element including a body (hereinafter, referred to as an internal negative electrode current collector) is arranged, and at least a part of an end portion of the metal coating layer is electrically connected to the inner surface of the outer casing of the same polarity, and the outer casing is formed. Sealing material that also serves as electrical insulation in the peripheral area of the body,
For example, the battery element is hermetically sealed with an adhesive, the battery element is formed in a strip shape, folded and housed in the outer package, the metal coating layer is porous, the internal current collector Arranging the active material in a constant pattern on the inner surface of the battery element, arranging an electric insulating material, for example, an adhesive, various rubber-based organic substances, filler-containing organic substances, etc. in at least the bent portion of the battery element, Is an even number of times, the metal coating layer is adhered, printed,
It is coated by vapor deposition, plating, etc., and has a thickness of about 30 μm or less, the metal coating layer is formed in a certain pattern, and an overcurrent is caused in a part of the metal coating layer. A portion that melts when flowing (hereinafter referred to as a fuse portion) is provided, that the electrical connection is performed by joining with a conductive material, and a fold line, such as a slit or a perforation line, is previously formed in the bent portion. Alternatively, thinning without disposing an active material, providing a bending region between the patterns, that the conductive material is a mixture of conductive fine powder and resin, the inside of the battery is The present invention is characterized in that it is in a reduced pressure state and that the resin film of the internal positive electrode current collector and the resin film of the internal negative electrode current collector are adhered to each other, thereby solving the above-mentioned problems.

【０００５】[0005]

【作用】本発明は前記目的を達成するもので、低価格、
高品質・性能、製造の簡易化を計ることができる。すな
わち請求項１により外側に非孔質な集電体を設けること
で外装を兼ねた気密性の高い（保存性能が高まる。即ち
水分の透過による電池構成材料の変質が防止される。）
電池容器が形成でき、外側面を端子部とすることがで
き、端子の取り出しが容易となる。さらに、内部の各極
の集電体に金属被覆層を設けた樹脂フィルムを使用する
ことで、薄く且つ安価な材料が使用でき電池の厚さを薄
くできる（連続して移動させ、巻き取り巻きだしても、
途中で切断することがない。）とともに電池全体のコス
トを低減できる。さらに電解質による腐食による電池外
部への漏出が防止できる。The present invention achieves the above-mentioned object, and is low cost,
High quality / performance and simplification of manufacturing can be achieved. That is, by providing a non-porous current collector on the outside according to claim 1, high airtightness that also serves as an exterior is enhanced (preservation performance is improved, that is, deterioration of the battery constituent material due to moisture permeation is prevented).
A battery container can be formed, and the outer surface can be used as a terminal portion, so that the terminal can be taken out easily. Furthermore, by using a resin film with a metal coating layer on the current collector of each electrode inside, thin and inexpensive materials can be used and the battery thickness can be reduced (continuously moving and winding and unwinding). Even
Never cut off on the way. In addition, the cost of the entire battery can be reduced. Furthermore, leakage to the outside of the battery due to corrosion by the electrolyte can be prevented.

【０００６】請求項２により電池容量及び取り出し電流
値を大きくしようとすれば、総電極面積を大きくし電極
の折り曲げ数を増やすだけで良い。また帯状にすること
で電池要素が一連の集電体面上で形成でき、生産性及び
ワ−クの移動が容易となる。請求項３により均一で非孔
質にしなくても集電効率を低下させることはなく安価な
材料が利用できる。請求項４によりパタ−ン間を折り曲
げ部分とすることで、集電体面と活物質との界面歪みに
よる影響がなくなり、活物質の脱落及び剥離が防止でき
る。In order to increase the battery capacity and the extraction current value according to the second aspect, it is sufficient to increase the total electrode area and increase the number of electrode bends. Further, by forming the belt-like shape, the battery element can be formed on a series of current collector surfaces, which facilitates productivity and movement of the work. According to the third aspect, it is possible to use an inexpensive material that does not reduce the current collecting efficiency even if the material is uniform and non-porous. By forming bent portions between the patterns according to the fourth aspect, the influence of the interface strain between the current collector surface and the active material is eliminated, and the active material can be prevented from falling off and peeling.

【０００７】請求項５により折り畳んだ場合の角部での
内部正極集電体内面と内部負極集電体内面の電気的短絡
が防止される。また電気絶縁材として接着剤などを塗布
することで折り畳み形状が保持できる。さらに２液性の
樹脂に無機物などのフィラ−を充填しておくことで折り
曲げた場合の隙間が確保でき、短絡が防止できる。また
ゴム系有機物質、例えばシリコンゴムなどを使用すれば
熱を加える必要もなく取り扱いが容易となる以外に空隙
に浸透し電気的短絡及び気密性が高まる。さらに請求項
１１を加味するとミシン目などから浸透した電気絶縁材
が電池内部の空隙を少なく且つ前記接着材の内側に二重
の隔壁を設けることとなり密封性を高める。電気絶縁材
の配置についてはあらかじめ所定の形状に打ち抜かれた
フィルムを配置するか、液状の電気絶縁材料を塗布する
ことで達成できる。According to the fifth aspect, an electric short circuit between the inner positive electrode current collector inner surface and the inner negative electrode current collector inner surface at the corner portion when folded is prevented. Further, the folded shape can be maintained by applying an adhesive or the like as an electric insulating material. Furthermore, by filling the two-liquid resin with a filler such as an inorganic substance, it is possible to secure a gap when folded and prevent a short circuit. Further, if a rubber-based organic material such as silicon rubber is used, it is not necessary to apply heat and the handling becomes easy. In addition, it penetrates into the voids to increase electrical short circuit and airtightness. Further, when the eleventh aspect is taken into consideration, the electric insulating material penetrating from perforations and the like reduces the voids inside the battery and provides a double partition wall inside the adhesive material to improve the sealing performance. The electric insulating material can be arranged by arranging a film punched into a predetermined shape in advance or by applying a liquid electric insulating material.

【０００８】請求項６により折り曲げ回数を偶数回にす
ることで上下面にそれぞれの極の集電体面を備えること
ができ、外装体との電気的接続が容易となる。請求項７
により請求項３を容易に具体化できる。即ち金属箔など
の接着については薄くて安価な金属箔鋼種、例えばアル
ミニウムでは非孔質性を必要としない場合など価格は半
減する。さらに金属被覆層の厚さが３０μ以上、例えば
銅箔の場合の価格は約１．５倍以上となる。また厚くな
れば折り曲げ部に皺が発生し、該皺部分が短絡を起こす
場合がある。最適な厚さとしては４００Å〜２０μであ
る。According to the sixth aspect, by setting the number of times of bending to an even number, the upper and lower surfaces can be provided with current collector surfaces of the respective poles, which facilitates electrical connection with the outer package. Claim 7
Thus, claim 3 can be easily embodied. That is, for the adhesion of metal foil or the like, the price is halved when the thin and inexpensive metal foil steel type such as aluminum does not require non-porous property. Further, the thickness of the metal coating layer is 30 μm or more, and the price in the case of copper foil is about 1.5 times or more. Further, if it becomes thicker, wrinkles may occur at the bent portion, and the wrinkles may cause a short circuit. The optimum thickness is 400Å to 20μ.

【０００９】請求項８によりパタ−ンとパタ−ンの間を
折り曲げ部分とすることで、対極の金属被覆層との電気
的な短絡が防止できる。また請求項４の作用効果を具体
化し助長する。請求項９により万が一電池に異常な大電
流が流れた場合、電池内部で電気回路を遮断し機器への
影響を防止する。即ち機器側に防止回路を設ける必要が
ない。このようなヒュ−ズ部は請求項８により形成でき
る。According to the eighth aspect, by forming a bent portion between the patterns, it is possible to prevent an electrical short circuit with the metal coating layer of the counter electrode. Further, the operation and effect of claim 4 is embodied and promoted. According to the ninth aspect, in the unlikely event that an abnormally large current flows through the battery, the electric circuit is cut off inside the battery to prevent the device from being affected. That is, there is no need to provide a protection circuit on the device side. Such a fuse portion can be formed according to claim 8.

【００１０】請求項１０により外装体内面と内部集電体
との電気的接続が容易となる。即ち、電池要素を形成し
折り畳んだ後に外装体内面又は内部集電体面に塗布し、
外装体内に電池要素を配置し、周縁域を接着材で熱接着
するだけで外装体と内部集電体との電気的接続が完了す
る。請求項１１により折り曲げる箇所の位置決めが確定
し折り畳む際に折り曲げ部以外の部分の変形がなくな
り、活物質の脱落や変形がなく内部短絡の危険性がなく
なる。またミシン目などでは請求項５で説明した効果を
もたらす。According to the tenth aspect, the electrical connection between the inner surface of the outer package and the inner current collector is facilitated. That is, after the battery element is formed and folded, it is applied to the inner surface of the outer package or the surface of the inner current collector,
The electrical connection between the exterior body and the internal current collector is completed simply by disposing the battery element in the exterior body and thermally bonding the peripheral area with an adhesive. According to the eleventh aspect, the position of the bending portion is determined, and when folding, the deformation of the portion other than the bending portion is eliminated, and the active material does not drop out or deform and the risk of internal short circuit is eliminated. In addition, the perforation and the like bring about the effect described in claim 5.

【００１１】請求項１２により活物質層の折り曲げがな
く、剥離及び脱落が防止され内部短絡がなくなる。請求
項１３により請求項１０の工程が連続的に行うことがで
きると共に、薄く塗布できたり重ね合わせ後に広く延び
るため接続による厚さ増加が低減できる。且つ広い面積
で接合できるため抵抗増加が防止できる。請求項１４に
より接着材と外装体を接着する際に、減圧状態下又は加
熱状態下に電池を配置することで、密閉後、電池内部を
減圧状態に保持できる。減圧状態にすることで電池の厚
さが所定厚さに保持できると共に、外装体と内部集電体
との電気的接続が強くなる。また電池要素内での接触度
が高まり、内部抵抗が低減され放電及び又は充電特性が
高まる。According to the twelfth aspect, the active material layer is not bent, peeling and dropping are prevented, and an internal short circuit is eliminated. According to the thirteenth aspect, the process of the tenth aspect can be continuously performed, and since the thin coating can be performed or the widened after the superposition, the increase in the thickness due to the connection can be reduced. In addition, since the bonding can be performed in a wide area, the increase in resistance can be prevented. According to the fourteenth aspect, by arranging the battery under a depressurized state or under a heated state when adhering the adhesive and the outer package, the inside of the battery can be kept in a depressurized state after sealing. By reducing the pressure, the battery can be kept at a predetermined thickness and the electrical connection between the outer package and the internal current collector is strengthened. In addition, the degree of contact within the battery element is increased, the internal resistance is reduced, and the discharge and / or charge characteristics are improved.

【００１２】請求項１５により各パタ−ン部分同士での
電気的短絡が防止できる。特に周縁部及び折り曲げ部で
の位置ずれ及び上下の関係にある集電体面との接触が防
止できる。樹脂フィルム上に周縁部に活物質が介在しな
い部分を設けることで短絡が防止できる。According to the fifteenth aspect, an electrical short circuit between the pattern portions can be prevented. In particular, it is possible to prevent the positional deviation at the peripheral portion and the bent portion and the contact with the current collector surface in the vertical relationship. A short circuit can be prevented by providing a peripheral portion of the resin film on which the active material does not intervene.

【００１３】[0013]

【実施例】【Example】

（実施例１）以下、本発明を図面に従って説明する。図
１は本発明に係わる電池要素を構成する帯状（但し、連
続で加工された一連のものから所定長さ、幅に裁断され
た後の形状を示す。即ち、該形状は多数のものが一定パ
タ−ンで形成され、所定の箇所で裁断され、個々の電池
要素として使用される。）の内部正極集電体５（金属被
覆層６として厚さ約０．００１ｍｍのアルミニウム蒸着
層を、樹脂フィルム７として厚さ約０．０１ｍｍのポリ
プロピレンフィルム上にパタ−ン形成した。なおこのパ
タ−ン形成は蒸着後、レ−ザ−などで不要名部分を除去
してもよい。）の斜視図を示す。周縁部には組立後に短
絡防止及び樹脂フィルム７同士の接着のための領域を設
けている。図２の断面図は図１の内部正極集電体５の金
属被覆層６面上に正極活物質８及びセパレ−タ９を配置
した後のＡ−Ａ’部の断面状態を示す。金属被覆層６上
に正極活物質８を印刷した後、セパレ−タ９として高分
子固体電解質を該正極活物質８の配置面積より僅かに大
きい面積で、ヒュ−ズ部１１の一部を包含するように印
刷されている。端子部１０は後工程で外装体との電気的
接続の際に利用される。また後工程で折り曲げられる部
分１２に電気絶縁材としての接着剤１２’が塗布されて
いるが、樹脂フィルム同士を接着する場合は省略しても
良い。上記正極活物質８及びセパレ−タ９を硬化させる
必要が有る場合は電子線照射、熱処理、紫外線照射など
がある。熱以外の場合は樹脂部分をマスキングした方が
樹脂の劣化が防止できる。(Embodiment 1) The present invention will be described below with reference to the drawings. FIG. 1 shows a band-like shape (however, a series of continuously processed ones after being cut into a predetermined length and a width, which constitute a battery element according to the present invention. The inner positive electrode current collector 5 (used as an individual battery element) formed of a pattern, cut at predetermined places, and used as a metal coating layer 6 is an aluminum vapor-deposited layer having a thickness of about 0.001 mm. A pattern was formed on a polypropylene film having a thickness of about 0.01 mm as the film 7. This pattern formation may be carried out by vapor deposition to remove unnecessary portions with a laser or the like). Indicates. A region for preventing a short circuit and for adhering the resin films 7 to each other is provided on the peripheral portion after assembly. The cross-sectional view of FIG. 2 shows a cross-sectional state of the AA ′ portion after the positive electrode active material 8 and the separator 9 are arranged on the surface of the metal coating layer 6 of the internal positive electrode current collector 5 of FIG. After the positive electrode active material 8 is printed on the metal coating layer 6, a solid polymer electrolyte is used as a separator 9 in an area slightly larger than the arrangement area of the positive electrode active material 8 and a part of the fuse part 11 is included. Is printed to do so. The terminal portion 10 is used in a later step when electrically connecting to the outer package. Further, the adhesive 12 'as an electric insulating material is applied to the portion 12 that can be bent in the subsequent step, but it may be omitted when the resin films are adhered to each other. When it is necessary to cure the positive electrode active material 8 and the separator 9, electron beam irradiation, heat treatment, ultraviolet irradiation, etc. may be used. In cases other than heat, masking the resin portion can prevent the deterioration of the resin.

【００１４】次に図３の斜視図に示すような内部負極集
電体１５を該内部正極集電体５とほぼ同様に、樹脂フィ
ルム１３上に金属被覆層１４として厚さ約０．００１ｍ
ｍの銅蒸着層をパタ−ン形成した。負極活物質１６は該
金属被覆層１４上に印刷（固形物の場合は転写）され、
その上に該負極活物質１６を包含するようにセパレ−タ
１７を印刷した。なお、該セパレ−タ１７は正極側に配
置されている場合、省略しても良い。An internal negative electrode current collector 15 as shown in the perspective view of FIG. 3 is formed on the resin film 13 as a metal coating layer 14 in a thickness of about 0.001 m in the same manner as the internal positive electrode current collector 5.
m copper vapor-deposited layer was formed by patterning. The negative electrode active material 16 is printed (transferred in the case of a solid) on the metal coating layer 14,
A separator 17 was printed so as to include the negative electrode active material 16. The separator 17 may be omitted if it is arranged on the positive electrode side.

【００１５】次に上記内部正極集電体５と内部負極集電
体１５を各パタ−ン部分が合致するように重ね合わせ、
樹脂フィルムの周縁部を熱接着し電池要素とした。なお
正極側のヒュ−ズ部１１と負極側のヒュ−ズ１８は重ね
合わせた時に接触しないように位置をずらしている。ま
た該ヒュ−ズ部はどちらか一方の内部集電体に設けるだ
けでも良い。さらにパタ−ンについてもどちらか一方の
内部集電体に設けるだけでも良い。Next, the internal positive electrode current collector 5 and the internal negative electrode current collector 15 are superposed so that the respective pattern parts coincide with each other,
The periphery of the resin film was heat-bonded to form a battery element. The fuse portion 11 on the positive electrode side and the fuse portion 18 on the negative electrode side are displaced from each other so as not to come into contact with each other when they are superposed. Further, the fuse portion may be provided only on one of the internal current collectors. Further, the pattern may be provided only on one of the internal current collectors.

【００１６】このような電池要素を折り曲げ部分１２で
折り畳み、図４に示す断面図のような構造にした。なお
図４では、多数折りの場合には図解が複雑になるため２
回折りの場合を示す。ここで、正極側の端子部１０と負
極側の端子部１９がはみ出すように重ね合わされてい
る。なお図４内の空隙は寸法を拡大しているために生じ
たものであって、実際はほとんどない状態である。Such a battery element was folded at the bent portion 12 to form a structure as shown in the sectional view of FIG. In addition, in FIG. 4, since the illustration becomes complicated in the case of multi-folding,
The case of folding is shown. Here, the terminal portion 10 on the positive electrode side and the terminal portion 19 on the negative electrode side are overlapped so as to protrude. It should be noted that the voids in FIG. 4 are generated because the dimensions are enlarged, and in reality, there are almost no voids.

【００１７】次に正極集電体２０として非孔質のステン
レス箔（厚さは約２０μ）の周縁部に封口材２１として
変成ポリプロピレンからなる枠状に成形された接着材
（厚さが厚い場合は熱接着の際に厚さ変形しないように
芯材を設けても良い。なお芯材を耐ガス透過性及び耐水
分透過性の材料を用いることで、厚きしても電池内部に
ガス及び水分が侵入せず電池要素が劣化しない。また芯
材だけにする場合は封口幅を約１ｍｍ以上にする必要が
ある。１ｍｍ以下では長期保存又は使用中に封口材を通
して水分が侵入し電池特性が低下する。）を約１４０℃
〜約１９０℃の温度で、約０．１秒間、クリアランスを
一定に保持した状態で加圧接着した。次に該正極集電体
２０の封口材２１の枠内に上記電池要素を装填した。な
お装填に先立ち電池要素の端子部１０及び１９の表面に
導電性材料２２として銀の微粉末を含有した樹脂を塗布
している。Next, a non-porous stainless steel foil (having a thickness of about 20 μm) serving as the positive electrode current collector 20 is provided around the periphery with a frame-shaped adhesive material made of modified polypropylene as the sealing material 21 (when the thickness is large, A core material may be provided so that the thickness of the core material is not deformed during heat bonding.By using a material having gas permeation resistance and moisture permeation resistance as the core material, even if the core material is thick, gas and The battery element does not deteriorate because water does not intrude.In addition, when only the core material is used, the sealing width needs to be about 1 mm or more. About 140 ℃
The pressure-bonding was performed at a temperature of about 190 ° C. for about 0.1 seconds while keeping the clearance constant. Next, the battery element was loaded in the frame of the sealing material 21 of the positive electrode current collector 20. Prior to loading, a resin containing silver fine powder as a conductive material 22 is applied to the surfaces of the terminal portions 10 and 19 of the battery element.

【００１８】図５は電池要素を収納した電池の断面図を
示す。電池要素を配置した正極集電体２０の封口材２１
上に負極集電体２３（材質、厚さは正極集電体２０と同
じである。）を配置し、電池要素面に対向する正極集電
体２０及び負極集電体２３の面を熱が加わらない（温度
は１００℃以下が好ましい。）ように加圧（スポンジ状
のシリコンゴムで行うと良い。なお加圧は電池要素の端
子部１０及び１９とそれぞれの集電体内面との接合を薄
くて且つ完全なものとすると共に、電池内部のガスを排
出するものである。）しながら負極集電体２３の周縁部
（封口材２１に相当する領域）を正極集電体２０を接着
したと同様な条件で接着した。なおこの際、正極集電体
２０と封口材２１との接着部への熱影響を抑制するため
加熱面は負極集電体２３側のみとした。封口材２１の枠
内側域に位置する集電体面は図５に示されるように僅か
にへこんでいる。このへこみは電池内部が減圧状態にあ
ることを示している。接着に際してはあらかじめ一部を
残して外装体と接着材を接着し、次に減圧下で残った部
分を接着しても良い。FIG. 5 shows a sectional view of a battery containing a battery element. Sealing material 21 for positive electrode current collector 20 in which battery elements are arranged
A negative electrode current collector 23 (the material and thickness of which is the same as that of the positive electrode current collector 20) is arranged on the upper surface of the negative electrode current collector 20. It is preferable to apply pressure (using sponge-like silicon rubber) so that it is not applied (temperature is preferably 100 ° C. or lower). The pressure is applied to the terminals 10 and 19 of the battery element and the inner surface of each current collector. The cathode current collector 20 is adhered to the peripheral portion of the negative electrode current collector 23 (a region corresponding to the sealing material 21) while making the gas thin and complete and discharging the gas inside the battery. Bonded under the same conditions as. At this time, the heating surface was only on the side of the negative electrode current collector 23 in order to suppress the thermal influence on the bonding portion between the positive electrode current collector 20 and the sealing material 21. The current collector surface located inside the frame of the sealing material 21 is slightly dented as shown in FIG. This dent indicates that the inside of the battery is in a reduced pressure state. At the time of adhesion, the exterior body and the adhesive may be adhered to each other while leaving a part thereof, and then the remaining part may be adhered under reduced pressure.

【００１９】（実施例２）樹脂フィルム２４上に図６の
如く繰り返しパタ−ンで金属被覆層２５（例えば、正極
ではアルミニウム、負極では銅など）を厚さ１μ程度に
形成し（パタ−ン状にはレ−ザ−により不要部分を除去
するか、又はパタ−ン状のマスキング材をを配置して形
成する。）た後、その上にそれぞれの活物質を配置又は
印刷した。該内部集電体の長さ方向の一端に端子部２６
を連続で形成し、さらに該端子部と各金属被覆層のパタ
−ン部とは幅を１ｍｍ以下としたヒュ−ズ部２７を形成
している。このような構成の各内部集電体を正極と負極
で端子部２６が反対方向になるように且つ樹脂フィルム
２４の正極側のＢ域と負極側のＣ域及び正極側のＣ域と
負極側のＢ域が対応するように位置をずらして重ね合わ
せた。なお重ね合わせた後に樹脂フィルム２４部分（特
にパタ−ンの外側部分域）を熱接着してもよい。該電池
要素の端子部を一体で接合（例えば、半田などで溶着す
る。）した。次にこのように組み立てられた電池要素
（特に図示していない。）を図５に示すように外装体内
に収納し、電池を作製した。各端子部との接続に際して
対向する外装体との接触部分に電気絶縁フィルムを配置
した。なおこの場合、外装体は金属箔（例えばステンレ
ス箔、アルミニウム箔など）を熱接着性樹脂フィルムで
３層構成にしたものを使用し、上記各端子部に相当する
部分の熱接着性樹脂フィルム内側層部分をレ−ザ−など
で除去し該端子部との電気的接続を行う（この場合は外
側の熱接着性樹脂フィルム面も外部端子部分として一部
除去する必要がある。）か、又は該端子部に外部端子リ
−ドを配置し電池外部に端子部が取り出せるようにして
外装体と接着材２１を接着しても良い。Example 2 A metal coating layer 25 (for example, aluminum for the positive electrode and copper for the negative electrode) is repeatedly formed on the resin film 24 as shown in FIG. 6 to a thickness of about 1 μm (pattern). After removing unnecessary portions with a laser, or arranging and forming a pattern-shaped masking material, each active material was arranged or printed on the mask. The terminal portion 26 is provided at one end in the length direction of the internal current collector.
Are continuously formed, and a fuse portion 27 having a width of 1 mm or less is formed between the terminal portion and the pattern portion of each metal coating layer. Each of the internal current collectors having such a configuration is arranged such that the positive electrode and the negative electrode have the terminal portions 26 in opposite directions, and the B region on the positive electrode side and the C region on the negative electrode side and the C region on the positive electrode side and the negative electrode side of the resin film 24. The positions were shifted so that the B areas of the two correspond to each other and they were overlapped. It should be noted that the resin film 24 portion (particularly the outer area of the pattern) may be heat-bonded after they are superposed. The terminal portions of the battery element were integrally joined (for example, welded with solder or the like). Next, the battery element (not shown) assembled in this manner was housed in an outer package as shown in FIG. 5 to prepare a battery. An electrical insulating film was arranged at the contact portion with the facing exterior body at the time of connection with each terminal portion. In this case, as the outer package, a metal foil (for example, a stainless steel foil, an aluminum foil, etc.) having a three-layer structure of a heat-adhesive resin film is used, and the inside of the heat-adhesive resin film at the portion corresponding to each terminal portion is used. The layer portion is removed by a laser or the like to electrically connect to the terminal portion (in this case, the outer heat-adhesive resin film surface must be partially removed as the external terminal portion), or An external terminal lead may be arranged on the terminal portion so that the terminal portion can be taken out of the battery and the outer casing and the adhesive material 21 may be bonded.

【００２０】このように作製した電池の保存性能を調査
するため、６０℃、湿度９０％、２０日の保存試験を実
施した。試験後の電池の放電容量を調査したところ、約
１．１％の損失であり、従来の単電池を複数個積層した
場合の約１．３％より僅かであるが改善された。内部集
電体に非孔質でない安価な材料を用いているにも係わら
ずこのような性能を有していることは、電池の封口が二
重になっていることによる。また電池要素を折り畳んだ
場合に折り曲げ部での短絡は認められなかった。また過
電流が流れた場合のヒュ−ズ効果については、約３Ａで
ヒュ−ズ部が溶断した。この値はヒュ−ズ部の幅、厚
さ、材質などを選択することで任意の電流値が選択でき
る。なお電池に異常電流が流れた場合にその部分に位置
するパタ−ン部のみの機能を停止させる場合は実施例２
に示す構成の方が効果的であることが、試験後の電池解
体調査により判明した。従来、電池容量を高めようとす
れば単電池を複数個積層すなどあるが、電気的接続は外
部端子での接続となり積層個数が多くなればなるほど接
続部での電気的特性が低下する。しかし本発明では電気
的接続は１回で行うことができ信頼性が高い。In order to investigate the storage performance of the battery thus manufactured, a storage test was conducted for 20 days at 60 ° C. and 90% humidity. When the discharge capacity of the battery after the test was investigated, it was found that the loss was about 1.1%, which was an improvement of a little less than about 1.3% when a plurality of conventional unit cells were stacked. The reason why the internal current collector has such a performance despite using an inexpensive material that is not non-porous is that the battery has a double sealing. Further, when the battery element was folded, no short circuit was found at the bent portion. Regarding the fuse effect when an overcurrent flows, the fuse portion melts at about 3A. An arbitrary current value can be selected for this value by selecting the width, thickness and material of the fuse portion. It should be noted that, in the case where the function of only the pattern portion located in that portion is stopped when an abnormal current flows in the battery, the second embodiment
It was found by the battery disassembly study after the test that the configuration shown in 1 was more effective. Conventionally, in order to increase the battery capacity, a plurality of unit cells are stacked. However, the electrical connection is made at the external terminal, and the electrical characteristics at the connection portion deteriorate as the number of stacked layers increases. However, in the present invention, the electrical connection can be made once, and the reliability is high.

【００２１】[0021]

【発明の効果】上記の如く作製された本発明の電池はさ
らに次に記載する効果を奏する。 （１）電池要素の並列接続以外に複数個の電池要素をそ
れぞれ接続した後、外装体内に収納することで直列接続
した電圧の高い電池を得ることができる。即ち電池容量
及び電池電圧を任意の値にすることができる。 （２）電池のシ−ルは外装体側でのみ完全とするだけで
すみ生産性が向上する。さらに電池要素側でもシ−ルを
行えば、密閉性が向上する。 （３）単電池の並列接続が省略でき、信頼性が高まると
共に連続したライン上で作製でき生産性が高まる。 （４）極板の折り曲げによる変形、弛みなどが防止で
き、所定の位置でずれることなく正極と負極を重ね合わ
せることができる。 （５）折り曲げ部の活物質の脱落・剥離が防止でき、内
部短絡が防止できると共に電池特性が向上する。 （６）折り曲げ部での電気的短絡が防止できる。 （７）極板面積、折り曲げ回数を任意にすることが容易
にでき、所定の電池厚さ、電池容量の電池が容易に得ら
れる。 （８）ヒュ−ズ部を電池内要素に付加させることで、過
電流による機器への損傷及び事故などが抑制される。 なお本発明においては実施例に示す電池形状に限定され
るものではなく、電池の種類、電池要素の形状、パタ−
ン形状、パタ−ン間の隙間、折り曲げ回数（但し偶数
値）、樹脂フィルムの厚さ・材質、ヒュ−ズ部の形状な
ど特に限定するものではなく、用途に応じて種種変更さ
れるものである。The battery of the present invention manufactured as described above has the following effects. (1) A battery having a high voltage connected in series can be obtained by connecting a plurality of battery elements other than the parallel connection of the battery elements and then storing the battery elements in an outer package. That is, the battery capacity and the battery voltage can be set to arbitrary values. (2) The battery seal only needs to be completed on the exterior body side, improving productivity. Further, if sealing is performed also on the battery element side, the hermeticity is improved. (3) can be parallelized connection is omitted of the cells, increases productivity can be fabricated in a continuous on-line the reliability is enhanced. (4) The electrode plate can be prevented from being deformed and loosened due to bending, and the positive electrode and the negative electrode can be superposed on each other without being displaced at a predetermined position. (5) It is possible to prevent the active material from falling off or peeling off at the bent portion, prevent an internal short circuit, and improve the battery characteristics. (6) An electrical short circuit at the bent portion can be prevented. (7) The electrode plate area and the number of times of bending can be easily made arbitrary, and a battery having a predetermined battery thickness and battery capacity can be easily obtained. (8) By adding the fuse part to the battery internal element, damage to the device and accident due to overcurrent are suppressed. It should be noted that the present invention is not limited to the battery shapes shown in the examples, but may include the type of battery, the shape of the battery element, the pattern.
Shape, gap between patterns, number of times of bending (however, even number), thickness / material of resin film, shape of fuse part, etc. are not particularly limited, and may be changed according to the application. is there.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明に係わる内部正極集電体の斜視図であ
る。FIG. 1 is a perspective view of an internal positive electrode current collector according to the present invention.

【図２】図１のＡ−Ａ’部の断面図である。2 is a cross-sectional view taken along the line A-A 'in FIG.

【図３】本発明に係わる内部負極集電体の斜視図であ
る。FIG. 3 is a perspective view of an internal negative electrode current collector according to the present invention.

【図４】本発明に係わる折り畳んだ状態の電池要素の断
面図である。FIG. 4 is a cross-sectional view of the battery element according to the present invention in a folded state.

【図５】本発明に係わる電池の断面図である。FIG. 5 is a sectional view of a battery according to the present invention.

【図６】本発明の他の実施例による内部集電体の構成の
斜視図である。FIG. 6 is a perspective view of a configuration of an internal current collector according to another embodiment of the present invention.

【図７】従来の電池の斜視図である。FIG. 7 is a perspective view of a conventional battery.

【符号の説明】[Explanation of symbols]

１、２０ 正極集電体 ２、２３ 負極集電体 ３、２１ 接着材（封口材） ５ 内部正極集電体 ６、１４、２５ 金属被覆層 ７、１３、２４ 樹脂フィルム ８ 正極活物質 ９ セパレ−タ（高分子固体電解質） １０、１９、２６ 端子部 １１、１８、２７ ヒュ−ズ部 １２ 折り曲げ部 １５ 内部負極集電体 １６ 負極活物質 ２２ 導電性材料 1, 20 Positive electrode current collector 2, 23 Negative electrode current collector 3, 21 Adhesive material (sealing material) 5 Internal positive electrode current collector 6, 14, 25 Metal coating layer 7, 13, 24 Resin film 8 Positive electrode active material 9 Separation -Polymer solid electrolyte 10, 19, 26 Terminal part 11, 18, 27 Fuse part 12 Bent part 15 Internal negative electrode current collector 16 Negative electrode active material 22 Conductive material

───────────────────────────────────────────────────── フロントページの続き (72)発明者 村田 和雄 大阪府高槻市城西町６番６号 株式会社ユ アサコーポレーション内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Murata 6-6 Josaimachi, Takatsuki City, Osaka Prefecture Yuasa Corporation

Claims (15)

【特許請求の範囲】[Claims] 【請求項１】 相対する平板状で非孔質性の外装体を兼
ねる正極集電体と負極集電体の間に、正極活物質を保持
した金属被覆層を有する樹脂フィルムからなる内部正極
集電体、セパレ−タ、負極活物質を保持した金属被覆層
を有する樹脂フィルムからなる内部負極集電体からなる
電池要素を配置すると共に、該金属被覆層の少なくとも
端部の一部を同極の外装体の内面に電気的に接続し、且
つ外装体の周縁域を電気絶縁を兼ねる封口材により封止
し、電池内を気密密閉したことを特徴とする電池。1. An internal positive electrode collector comprising a resin film having a metal coating layer holding a positive electrode active material between opposing positive electrode current collectors and negative electrode current collectors, which also serve as a non-porous outer package. A battery element composed of an internal negative electrode current collector made of a resin film having a metal coating layer holding an electric current collector, a separator, and a negative electrode active material is arranged, and at least a part of an end portion of the metal coating layer has the same polarity. A battery characterized in that it is electrically connected to the inner surface of the outer casing, and the peripheral region of the outer casing is sealed with a sealing material that also serves as electrical insulation, to hermetically seal the inside of the battery. 【請求項２】 前記電池要素が、帯状に形成され、折り
畳まれて前記外装体内に収納されていることを特徴とす
る請求項１記載の電池。2. The battery according to claim 1, wherein the battery element is formed in a strip shape, is folded, and is housed in the exterior body. 【請求項３】 前記金属被覆層が、多孔質であることを
特徴とする請求項１記載の電池。3. The battery according to claim 1, wherein the metal coating layer is porous. 【請求項４】 前記内部正極、負極集電体の内面に一定
パタ−ンで活物質を配置することを特徴とする請求項１
記載の電池。4. The active material is arranged on the inner surfaces of the internal positive electrode and negative electrode current collectors in a constant pattern.
Battery described. 【請求項５】 前記電池要素の少なくとも折り曲げ部分
に電気絶縁材を配置することを特徴とする請求項１記載
の電池。5. The battery according to claim 1, wherein an electric insulating material is disposed on at least a bent portion of the battery element. 【請求項６】 前記折り曲げ回数が、偶数回であること
を特徴とする請求項２記載の電池。6. The battery according to claim 2, wherein the number of times of bending is an even number. 【請求項７】 前記金属被覆層が、接着、印刷、蒸着又
はメッキにより被覆されたものであって、厚さが約３０
μ以下であることを特徴とする請求項１記載の電池。7. The metal coating layer is coated by adhesion, printing, vapor deposition or plating, and has a thickness of about 30.
The battery according to claim 1, wherein the battery is μ or less. 【請求項８】 前記金属被覆層が、一定パタ−ンに形成
されていることを特徴とする請求項１記載の電池。8. The battery according to claim 1, wherein the metal coating layer is formed in a constant pattern. 【請求項９】 前記金属被覆層の一部に過電流が流れる
場合に溶断するヒュ−ズ部を設けたことを特徴とする請
求項１記載の電池。9. The battery according to claim 1, wherein a fuse portion that blows when an overcurrent flows is provided in a part of the metal coating layer. 【請求項１０】 前記電気的接続が、導電性材料による
接合により行われることを特徴とする請求項１記載の電
池。10. The battery according to claim 1, wherein the electrical connection is made by joining with a conductive material. 【請求項１１】 前記折り曲げ部分にあらかじめ折り目
又は活物質を配置せず薄くすることを特徴とする請求項
２又は５記載の電池。11. The battery according to claim 2, wherein the folded portion is thinned without previously disposing a fold line or an active material. 【請求項１２】 前記パタ−ンとパタ−ンの間に折り曲
げ域を設けたことを特徴とする請求項４又は８記載の電
池。12. The battery according to claim 4, wherein a bending region is provided between the patterns. 【請求項１３】 前記導電性材料が、導電性微粉末と樹
脂の混合物であることを特徴とする請求項１０記載の電
池。13. The battery according to claim 10, wherein the conductive material is a mixture of conductive fine powder and a resin. 【請求項１４】 前記電池内部が減圧状態であることを
特徴とする請求項１記載の電池。14. The battery according to claim 1, wherein the inside of the battery is in a reduced pressure state. 【請求項１５】 前記内部正極集電体の樹脂フィルムと
内部負極集電体の樹脂フィルムを互いに接着したことを
特徴とする請求項１記載の電池。15. The battery according to claim 1, wherein the resin film of the internal positive electrode current collector and the resin film of the internal negative electrode current collector are adhered to each other.