JP2002008629A - Electro chemical device - Google Patents
Electro chemical deviceInfo
- Publication number
- JP2002008629A JP2002008629A JP2000181676A JP2000181676A JP2002008629A JP 2002008629 A JP2002008629 A JP 2002008629A JP 2000181676 A JP2000181676 A JP 2000181676A JP 2000181676 A JP2000181676 A JP 2000181676A JP 2002008629 A JP2002008629 A JP 2002008629A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- outer bag
- electrochemical device
- bag
- external
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ポリマーリチウム
二次電池、電気二重層キャパシタ等の電気化学デバイス
及びその製造方法に関し、特に、内部の出ガスに対する
安全機構を有する電気化学デバイスに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrochemical device such as a polymer lithium secondary battery and an electric double layer capacitor and a method for manufacturing the same, and more particularly to an electrochemical device having a safety mechanism against internal gas emission.
【０００２】[0002]
【従来の技術】携帯用電子機器の普及に伴い、軽量、小
型でなおかつ長時間の連続駆動が可能な二次電池等の電
気化学デバイスが求められている。従来の二次電池は金
属の外装缶を使用していたが、リチウムポリマー電池に
代表されるように、外装袋に薄くて軽いフィルムを用い
ることによって電池重量を減らし、設計の自由度を増大
させることが可能となった。2. Description of the Related Art With the spread of portable electronic devices, there has been a demand for electrochemical devices such as secondary batteries which are lightweight and small and which can be driven continuously for a long time. Conventional secondary batteries use metal outer cans, but as represented by lithium polymer batteries, use thin and light films for outer bags to reduce battery weight and increase design flexibility. It became possible.
【０００３】外装袋に使用されているフィルムは、主に
数種の樹脂でアルミ箔をコーティングしたアルミラミネ
ートフィルムである。このアルミラミネートフィルムは
軽量であり、今までの金属の外装缶を用いた電池よりも
薄く、軽くすることが可能となった。[0003] The film used for the outer bag is an aluminum laminated film in which an aluminum foil is mainly coated with several kinds of resins. This aluminum laminated film is light in weight, and can be made thinner and lighter than a battery using a conventional metal outer can.
【０００４】従来、このようなフィルムを外装袋に用い
た電池に何らかの異常が生じた場合、使用する電解質の
種類にもよるが、ガスが発生したり、最悪の場合発火に
至ることがある。例えば、充電器は所定の時間や電圧に
達すると充電を停止するように設定されているが、何ら
かの理由で充電が停止しなかった場合、電池の容量を超
え過充電となる。さらに過充電状態が進むと電解質が分
解してガスが発生して外装袋が膨らみ、その後袋が破裂
したり、発火する。Conventionally, when any abnormality occurs in a battery using such a film as an outer bag, depending on the type of electrolyte used, gas may be generated or, in the worst case, ignition may occur. For example, the charger is set to stop charging when a predetermined time or voltage is reached, but if charging is not stopped for any reason, the battery exceeds the capacity of the battery and is overcharged. When the overcharge state further progresses, the electrolyte is decomposed, gas is generated, and the outer bag expands, and then the bag bursts or ignites.
【０００５】このような事態を避けるために、通常、電
池には保護回路が設けられている。この保護回路は、通
常、所定の電圧に達すると電流を流さないような機能を
有している場合が多い。[0005] To avoid such a situation, a battery is usually provided with a protection circuit. Usually, this protection circuit often has a function of preventing a current from flowing when a predetermined voltage is reached.
【０００６】また、ガスが発生して外装袋が膨らんだ場
合、破裂をさけるために外装袋にガスを逃がす機構を付
加する事もある。これは外装袋内部の圧力が上がると外
装袋の所定の場所からガスを逃がすことによってさらな
る袋の膨張を防ぎ、また、ガスを逃がすことにより内部
温度を下げて電池の熱暴走を防止する効果がある。When gas is generated and the outer bag is inflated, a mechanism for releasing gas may be added to the outer bag in order to prevent rupture. This has the effect of preventing gas from escaping further by allowing gas to escape from a predetermined location in the outer bag when the pressure inside the outer bag rises, and lowering the internal temperature by releasing gas to prevent thermal runaway of the battery. is there.
【０００７】しかし、上記保護回路を設けるとすると、
それだけ部品を余計に必要とし、小型、軽量化が重要な
要素である携帯機器の要求にそぐわない。また、保護回
路を設けたとしても、何らかの理由で保護回路が動作し
ない可能性があり、その場合にも安全性を確保する必要
がある。また、ガスを逃がす機構を付加する場合、ガス
が抜けた後も充電が続くため、依然として発火の危険性
が残る。However, if the above protection circuit is provided,
This requires extra parts and does not meet the demand for portable devices, where miniaturization and weight reduction are important factors. Further, even if the protection circuit is provided, the protection circuit may not operate for some reason. In such a case, it is necessary to ensure safety. In addition, in the case where a mechanism for releasing gas is added, charging continues even after gas is released, so that there is still a risk of ignition.
【０００８】[0008]
【発明が解決しようとする課題】本発明の目的は、柔軟
性のあるフィルムを外装袋に用いた二次電池などの電気
化学デバイスにおいて、保護回路を有することなく、ガ
スが発生するような異常時に電流が流れないようにする
安全機構を提供することである。SUMMARY OF THE INVENTION It is an object of the present invention to provide an electrochemical device such as a secondary battery using a flexible film for an outer bag, which does not have a protection circuit and which generates gas. It is to provide a safety mechanism that prevents current from flowing at times.
【０００９】[0009]
【課題を解決するための手段】このような目的は、下記
の本発明により解決される。 （１） 柔軟性を有する外装袋と、この外装袋内に封入
される電気化学素子とを有する電気化学デバイスであっ
て、 前記電気化学素子は、内部電極と、この内部電極と電気
的に接続され外装袋外に導出されている外部電極とを有
し、 前記外装袋の内部空間の膨張による応力を検出して少な
くとも前記内部電極と外部電極とのいずれかの電気的接
続を遮断する電流遮断手段を有する電気化学デバイス。 （２） 前記電流遮断手段は、内部電極と外部電極との
機械的接続を前記応力により破壊する上記（１）の電気
化学デバイス。 （３） 前記内部電極と外部電極とは、前記外装袋の内
部空間の膨張による応力が、それぞれの接続を破壊する
ように外装袋と接続されている上記（１）または（２）
の電気化学デバイス。 （４） 内部電極の一部が引っ張り強度Ａで外装袋と接
着され、外部電極の一部が引っ張り強度Ｂで外装袋と接
着されており、内部電極と外部電極とが引っ張り強度Ｃ
接続されているとき、Ａ＞ＣかつＢ＞Ｃである上記
（１）〜（３）のいずれかの電気化学デバイス。 （５） リチウム二次電池である上記（１）〜（４）の
いずれかの電気化学デバイス。This and other objects are attained by the present invention described below. (1) An electrochemical device having a flexible outer bag and an electrochemical element sealed in the outer bag, wherein the electrochemical element is electrically connected to an internal electrode and the internal electrode. And an external electrode led out of the outer bag, and a current interrupter for detecting a stress caused by expansion of an inner space of the outer bag and interrupting at least one of the internal electrode and the external electrode. An electrochemical device having means. (2) The electrochemical device according to (1), wherein the current interrupting means breaks a mechanical connection between the internal electrode and the external electrode by the stress. (3) The above-mentioned (1) or (2), wherein the internal electrode and the external electrode are connected to the outer bag such that stress caused by expansion of the inner space of the outer bag breaks each connection.
Electrochemical device. (4) A part of the internal electrode is adhered to the outer bag with a tensile strength of A, and a part of the external electrode is adhered to the outer bag with a tensile strength of B. The internal electrode and the external electrode have a tensile strength of C.
The electrochemical device according to any one of the above (1) to (3), wherein A> C and B> C when connected. (5) The electrochemical device according to any one of the above (1) to (4), which is a lithium secondary battery.
【００１０】[0010]
【作用】本発明者は、検討を重ねた結果、電気化学デバ
イス素体の内部電極と接続され、外装袋外に導出する外
部電極に着目し、この外部電極と、内部電極との接続を
遮断することにより、過充電等による事故を防止するこ
ととした。As a result of repeated studies, the present inventor focused on an external electrode connected to the internal electrode of the electrochemical device body and led out of the outer bag, and cut off the connection between the external electrode and the internal electrode. By doing so, it was decided to prevent accidents due to overcharging and the like.
【００１１】そして、過充電状態、ないし異常状態を検
出し、外部電極と内部電極との接続を解除する手段とし
て、過充電状態、ないし異常状態で生じる出ガスによ
り、内部空間が膨張し、この膨張圧力が外装袋に加えら
れることを利用することとした。As means for detecting an overcharged state or an abnormal state and disconnecting the external electrode from the internal electrode, the internal space expands due to outgas generated in the overcharged state or the abnormal state. The fact that inflation pressure is applied to the outer bag is used.
【００１２】すなわち、内部電極と外部電極とを、外装
袋が膨らんだ状態のときに引っ張られ、接続が解除され
るような力が加えられる外装袋の位置に固定する。そし
て、外装袋が出ガスで膨らむと、内部電極と外部電極と
の機械的接続が膨張による応力により引き剥がされ、結
果として電気的接続が遮断される。That is, the internal electrode and the external electrode are fixed at the position of the outer bag to which a force is applied so that the inner bag and the outer electrode are pulled when the outer bag is inflated and the connection is released. Then, when the outer bag is inflated by outgassing, the mechanical connection between the internal electrode and the external electrode is peeled off by the stress caused by the expansion, and as a result, the electrical connection is cut off.
【００１３】[0013]
【発明の実施の形態】本発明の電気化学デバイスは、柔
軟性を有する外装袋と、この外装袋内に封入される電気
化学素子とを有する電気化学デバイスであって、前記電
気化学素子は、内部電極と、この内部電極と電気的に接
続され外装袋外に導出されている外部電極とを有し、前
記外装袋の内部空間の膨張による応力を検出して少なく
とも前記内部電極と外部電極とのいずれかの電気的接続
を遮断する電流遮断手段を有するものである。BEST MODE FOR CARRYING OUT THE INVENTION The electrochemical device of the present invention is an electrochemical device having a flexible outer bag and an electrochemical element sealed in the outer bag, wherein the electrochemical element comprises: An internal electrode, having an external electrode that is electrically connected to the internal electrode and is led out of the outer bag, detects stress caused by expansion of the internal space of the outer bag, and detects at least the internal electrode and the outer electrode. And current interrupting means for interrupting any of the electrical connections.
【００１４】また、好ましくは前記電流遮断手段は、内
部電極と外部電極との機械的接続を前記応力により破壊
するものであり、前記外装袋の内部空間の膨張による応
力が、それぞれの接続を破壊するように外装袋と接続さ
れているものである。Preferably, the current interrupting means breaks a mechanical connection between an internal electrode and an external electrode by the stress, and a stress caused by expansion of an internal space of the outer bag breaks each connection. It is connected to the outer bag so that
【００１５】すなわち、内部電極の一部が引っ張り強度
Ａで外装袋と接着され、外部電極の一部が引っ張り強度
Ｂで外装袋と接着されており、内部電極と外部電極とが
引っ張り強度Ｃ接続されているとき、Ａ＞ＣかつＢ＞Ｃ
であり、好ましくはＡおよびＢ＞２Ｃ、特にＡおよびＢ
＞５Ｃである。That is, a part of the internal electrode is adhered to the outer bag with a tensile strength of A, and a part of the external electrode is adhered to the outer bag with a tensile strength of B. The internal electrode and the external electrode are connected by a tensile strength of C. A> C and B> C
And preferably A and B> 2C, especially A and B
> 5C.
【００１６】内部電極と、外部電極とをそれぞれ引っ張
り強度ＡおよびＢで外装袋と接着するには、通常用いら
れている接着剤を用いればよい。具体的には、外部電極
を外装袋の封入部で封止するための接着剤などが適して
いる。より具体的には、例えばカルボン酸等の酸変性ポ
リエチレン、酸変性ポリプロピレン、エポキシ樹脂、変
性イソシアネート等を例示できる。In order to bond the inner electrode and the outer electrode to the outer bag at tensile strengths A and B, a commonly used adhesive may be used. Specifically, an adhesive or the like for sealing the external electrode with the sealing portion of the outer bag is suitable. More specifically, examples thereof include acid-modified polyethylene such as carboxylic acid, acid-modified polypropylene, epoxy resin, and modified isocyanate.
【００１７】内部電極と、外部電極とが外装袋と接続さ
れる引っ張り強度としては、上記関係を満たすものであ
れば特に限定されるものではないが、例えば、単位面積
当たり２０〜１００gｆ／mm2 、特に３０〜６５gf／mm2
程度である。The tensile strength at which the inner electrode and the outer electrode are connected to the outer package is not particularly limited as long as the above relationship is satisfied. For example, 20 to 100 gf / mm 2 per unit area Especially 30 to 65 gf / mm 2
It is about.
【００１８】内部電極と、外部電極とを引張強度Ｃで接
続するための手段としては、接着、溶接、ハンダ付け等
一般に金属同士を接続するために用いられている手段を
用いることができる。これらのなかでも超音波溶接が、
接着応力を容易に調節することができるため好ましい。
超音波溶接で接着応力を調節するには、超音波出力、溶
接時間、溶接時に加える圧力のいずれか１つ、あるいは
これらを複合的に調節することにより調節することがで
きる。As means for connecting the internal electrode and the external electrode with a tensile strength C, means generally used for connecting metals, such as bonding, welding, and soldering, can be used. Among these, ultrasonic welding,
This is preferable because the adhesive stress can be easily adjusted.
In order to adjust the adhesive stress by ultrasonic welding, it can be adjusted by adjusting any one of ultrasonic output, welding time, pressure applied during welding, or a combination of these.
【００１９】内部電極と、外部電極とが接続される引っ
張り強度としては、上記関係を満たすものであれば特に
限定されるものではないが、例えば、単位面積当たり３
〜３０gf／mm2 、特に６〜１３gf／mm2 程度である。The tensile strength at which the internal electrode and the external electrode are connected is not particularly limited as long as the above relationship is satisfied.
-30 gf / mm 2 , especially about 6-13 gf / mm 2 .
【００２０】なお、外装袋が膨張するときに得られる応
力は、通常、２０〜１００gf／mm2程度である。The stress obtained when the outer bag expands is usually about 20 to 100 gf / mm 2 .
【００２１】次に、本発明の電気化学デバイスについ
て、図面を参照しながら説明する。図１は、本発明の電
気化学デバイスの概略の構造を示す一部断面図である。
図２は、図１において、外装袋２が出ガスにより膨張し
た状態を示している。Next, the electrochemical device of the present invention will be described with reference to the drawings. FIG. 1 is a partial sectional view showing a schematic structure of the electrochemical device of the present invention.
FIG. 2 shows a state in which the outer bag 2 is inflated by outgassing in FIG.
【００２２】図１に示す電気化学デバイスは、正極４、
電解質５、負極６が積層された電気化学素子を、外装袋
２の中に封入した構造となっている。このとき、電気化
学素子の外部電極（導出端子）３を外部に突き出した状
態で収納し、外装袋２の開口した端面を外部電極３を挟
んで熱融着で封口してシール部７を形成して構成されて
いる。電気化学デバイスは、電気化学素子を外装袋２内
に密封すると共に、シール部７から外部電極３が外部に
突き出した構造を有する。このとき、外装袋２の内部
は、実質的にガスが抜かれ、外装袋２は電気化学素子に
密着するようにして密封している。なお、図１，２は、
電気化学素子と外装袋の外部電極付近の一部を示してい
る。The electrochemical device shown in FIG.
The electrochemical device in which the electrolyte 5 and the negative electrode 6 are laminated is sealed in the outer bag 2. At this time, the external electrode (lead-out terminal) 3 of the electrochemical element is housed in a state of protruding outside, and the opened end face of the outer package 2 is sealed by heat fusion with the external electrode 3 interposed therebetween to form a seal portion 7. It is configured. The electrochemical device has a structure in which the electrochemical element is sealed in the outer bag 2 and the external electrodes 3 protrude from the sealing portion 7 to the outside. At this time, the interior of the outer bag 2 is substantially evacuated of gas, and the outer bag 2 is tightly sealed to the electrochemical element. 1 and 2
The electrochemical element and a part of the outer bag near the external electrode are shown.
【００２３】図示例では、外部電極３は、外装袋２の上
部側に接着剤８で接着固定され、内部電極（正極）４
は、外装袋２の下部側に接着剤９で接着固定されてい
る。また、外部電極３と内部電極（正極）４とは、接着
部１１で接続されている。In the illustrated example, the external electrode 3 is bonded and fixed to the upper side of the outer bag 2 with an adhesive 8, and the internal electrode (positive electrode) 4
Is bonded and fixed to the lower side of the outer bag 2 with an adhesive 9. Further, the external electrode 3 and the internal electrode (positive electrode) 4 are connected by an adhesive portion 11.
【００２４】いま過充電などの何らかの異常状態によ
り、出ガスが生じ、外装袋２内が膨張すると、外装袋２
は図示例で上下方向にも膨らもうとするので、外部電極
３と内部電極（正極）４とは、接着部１１において引き
剥がされるような応力を受ける。そして、さらに出ガス
による膨張が進むと、図２に示すように、ついに外部電
極３と内部電極（正極）４との接着応力Ｃより、膨張に
よる応力が勝り、接着部１１での接続（接着）が破壊さ
れ（引き剥がされ）て両者の接続は遮断される。この場
合、接続が破壊されるのは正極側でも負極側でも、その
両者であってもよく、少なくともいずれかの接続が遮断
されれば電流は流れず、安全が確保される。When gas is generated due to some abnormal condition such as overcharging and the inside of the outer bag 2 expands, the outer bag 2
In the illustrated example, the outer electrode 3 and the inner electrode (positive electrode) 4 are subjected to stress such that the outer electrode 3 and the inner electrode (positive electrode) 4 are peeled off at the bonding portion 11. When the expansion due to the outgassing further proceeds, as shown in FIG. 2, the stress due to the expansion finally exceeds the bonding stress C between the external electrode 3 and the internal electrode (positive electrode) 4, and the connection (bonding) at the bonding portion 11 ) Is destroyed (peeled off) and the connection between them is cut off. In this case, the connection may be destroyed on either the positive electrode side or the negative electrode side, or on both sides. If at least one of the connections is interrupted, no current flows and safety is ensured.
【００２５】このとき、外部電極３と内部電極（正極）
４との接着応力Ｃより、外部電極３と内部電極４とが、
外装袋２に接着剤８，９で接着固定されている応力Ａ，
Ｂが勝っているので、接着部１１での接着破壊が優先し
て生じる。また、外装袋２がある程度膨らんだ状態で一
気に接着破壊が生じるので、図示例のように破壊と同時
に外部電極３と内部電極４とは一気に引き剥がされ、完
全に電気的接続は遮断される。そして、その後も膨らん
だ状態は維持されているので、接続が回復することはな
い。At this time, the external electrode 3 and the internal electrode (positive electrode)
4, the external electrode 3 and the internal electrode 4
The stress A, which is bonded and fixed to the outer bag 2 with the adhesives 8 and 9,
Since B is superior, adhesive breakage at the bonding portion 11 occurs preferentially. Further, since the adhesive failure occurs at a stretch when the outer bag 2 is expanded to some extent, the external electrode 3 and the internal electrode 4 are peeled off at a stretch at the same time as the breakdown as shown in the illustrated example, and the electrical connection is completely cut off. Since the expanded state is maintained thereafter, the connection is not restored.
【００２６】電気化学素子は、例えば図３に示すよう
に、アルミニウム箔や銅箔等の金属箔等で構成される正
負両極の電極４、６と高分子固体電解質５とが交互に積
層された構造を有する。正負両極の電極４，６には、そ
れぞれ外部電極（導出端子）３が接続されている（図中
負極側は省略している）。外部電極３は、アルミニウ
ム、銅、ニッケル、ステンレス等の金属箔で構成され
る。外部電極３は、接着剤７で覆われる領域のシール部
を有する。In the electrochemical device, as shown in FIG. 3, for example, positive and negative bipolar electrodes 4 and 6 composed of a metal foil such as an aluminum foil or a copper foil and a solid polymer electrolyte 5 are alternately laminated. Having a structure. External electrodes (lead-out terminals) 3 are connected to the positive and negative electrodes 4 and 6, respectively (the negative electrode side is omitted in the figure). The external electrode 3 is made of a metal foil such as aluminum, copper, nickel, and stainless steel. The external electrode 3 has a seal portion in a region covered with the adhesive 7.
【００２７】外装袋２は、例えばアルミニウム等の金属
層の両面に、熱接着性樹脂層としてのポリプロピレン、
ポリエチレン等のポリオレフィン樹脂層や耐熱性のポリ
エステル樹脂層が積層されたラミネートフィルムから構
成されている。外装袋２は、予め２枚のラミネートフィ
ルムをそれらの３辺の端面の熱接着性樹脂層相互を熱接
着して第１のシール部を形成し、１辺が開口した袋状に
形成される。あるいは、一枚のラミネートフィルムを折
り返して両辺の端面を熱接着してシール部を形成して袋
状としてもよい。The outer bag 2 is made of, for example, polypropylene as a heat-adhesive resin layer on both sides of a metal layer such as aluminum.
It is composed of a laminated film in which a polyolefin resin layer such as polyethylene or a heat-resistant polyester resin layer is laminated. The outer bag 2 is formed in a bag shape with one side opened by previously bonding two laminated films to each other by thermally bonding the thermo-adhesive resin layers on the end surfaces of the three sides to each other. . Alternatively, a single laminated film may be folded back and the both end faces may be thermally bonded to form a seal portion to form a bag.
【００２８】本発明の電気化学デバイスの第２のシール
部では、図１に示すように、外部電極３が外装袋２を構
成するラミネートフィルムで挟まれており、外部電極３
とラミネートフィルムの熱接着性樹脂層との間には、外
部電極３上に直接積層された金属−樹脂間接着剤７を有
する。In the second sealing portion of the electrochemical device according to the present invention, as shown in FIG. 1, the external electrode 3 is sandwiched by the laminate film forming the outer bag 2 and the external electrode 3
A metal-resin adhesive 7 directly laminated on the external electrode 3 is provided between the metal film and the heat-adhesive resin layer of the laminate film.
【００２９】金属−樹脂間接着剤７としては、例えばカ
ルボン酸等の酸変性ポリエチレン、酸変性ポリプロピレ
ン、エポキシ樹脂、変性イソシアネート等を例示でき
る。金属−樹脂間接着剤は、金属とポリオレフィン樹脂
との間に介在してこれらの密着性を良好にするためのも
のであるから、導出端子３のシール部を覆う程度の大き
さで十分である。Examples of the metal-resin adhesive 7 include acid-modified polyethylene such as carboxylic acid, acid-modified polypropylene, epoxy resin, and modified isocyanate. Since the metal-resin adhesive is provided between the metal and the polyolefin resin to improve the adhesion between them, it is sufficient that the adhesive covers the sealing portion of the lead-out terminal 3. .
【００３０】なお、外装袋を構成するラミネートフィル
ムとしては、ラミネートフィルムを構成する金属箔と導
出端子間の絶縁を確保するため、内層側から熱接着性樹
脂層／ポリエステル樹脂層／金属箔／ポリエステル樹脂
層の積層構造を有するラミネートフィルムを用いること
が好ましい。このようなラミネートフィルムを用いるこ
とにより、熱接着時に高融点のポリエステル樹脂層が溶
けずに残るため、導出端子と外装袋の金属箔との離間距
離を確保し、絶縁を確実にすることができる。そのた
め、ラミネートフィルムのポリエステル樹脂層の厚さ
は、５〜１００μｍ程度とすることが好ましい。In order to ensure insulation between the metal foil forming the laminate film and the lead-out terminal, the laminate film forming the outer package is formed from the inner layer side with a heat-adhesive resin layer / polyester resin layer / metal foil / polyester. It is preferable to use a laminate film having a laminated structure of resin layers. By using such a laminated film, the high melting point polyester resin layer remains without melting at the time of thermal bonding, so that a separation distance between the lead terminal and the metal foil of the outer package can be ensured, and insulation can be ensured. . Therefore, the thickness of the polyester resin layer of the laminate film is preferably about 5 to 100 μm.
【００３１】本発明の電気化学デバイスに用いられる電
気化学素子は、図１，２に示すような積層構造の二次電
池に限定されるものではなく、図３〜５に示すような巻
回された二次電池、あるいはこれらと同様な構造を有す
るキャパシタなどを用いることができる。The electrochemical element used in the electrochemical device of the present invention is not limited to a secondary battery having a laminated structure as shown in FIGS. 1 and 2, but is wound as shown in FIGS. A secondary battery, a capacitor having a similar structure to these, or the like can be used.
【００３２】図４において、図示例の二次電池２１は、
負極２３と正極２５と、これらの間に挟まれた電解質２
４とを巻回した構造を有している。そして、正極２５の
端部には巻止め用テープ２７を有し、巻回された状態を
維持している。負極２３、正極２５には、それぞれ外部
電極（導出端子）２２，２３を有する。In FIG. 4, a secondary battery 21 in the illustrated example is
Negative electrode 23 and positive electrode 25, and electrolyte 2 sandwiched between them
4 is wound. The end of the positive electrode 25 is provided with a tape 27 for stopping and maintains the wound state. The negative electrode 23 and the positive electrode 25 have external electrodes (lead-out terminals) 22, 23, respectively.
【００３３】このような二次電池２１は、図５に示すよ
うに外装袋２２内に封入される。そして、内部電極（正
極）２５を含む二次電池２１は、接着剤２９で外装袋２
２の下部に接着され、外部電極２３は、接着剤２８で外
装袋の上部に接着されている。Such a secondary battery 21 is sealed in an outer bag 22 as shown in FIG. Then, the secondary battery 21 including the internal electrode (positive electrode) 25 is bonded to the outer bag 2 with the adhesive 29.
2 and the external electrode 23 is bonded to the upper part of the outer bag with an adhesive 28.
【００３４】そして、図６に示すように、上記同様に何
らかの異常により外装袋２２が膨らむと、外部電極２３
と、内部電極２５との接続部３１が破壊され、両者は一
気に引き剥がされる。As shown in FIG. 6, when the outer bag 22 expands due to some abnormality as described above, the external electrode 23
Then, the connection portion 31 with the internal electrode 25 is broken, and the two are separated at a stretch.
【００３５】本発明の電気化学デバイスは、次のような
リチウム二次電池、電気二重層キャパシタとして用いる
ことができる。The electrochemical device of the present invention can be used as a lithium secondary battery or an electric double layer capacitor as described below.
【００３６】＜リチウム二次電池＞本発明のリチウム二
次電池の構造は特に限定されないが、通常、正極、負極
及び高分子固体電解質から構成され、積層型電池や角型
電池等に適用される。<Lithium Secondary Battery> Although the structure of the lithium secondary battery of the present invention is not particularly limited, it is usually composed of a positive electrode, a negative electrode, and a solid polymer electrolyte, and is applied to a stacked battery, a prismatic battery, and the like. .
【００３７】また、高分子固体電解質と組み合わせる電
極は、リチウム二次電池の電極として公知のものの中か
ら適宜選択して使用すればよく、好ましくは電極活物質
とゲル電解質、必要により導電助剤との組成物を用い
る。The electrode to be combined with the solid polymer electrolyte may be appropriately selected from those known as electrodes for a lithium secondary battery, and is preferably used as an electrode active material and a gel electrolyte. Is used.
【００３８】負極には、炭素材料、リチウム金属、リチ
ウム合金あるいは酸化物材料のような負極活物質を用
い、正極には、リチウムイオンがインターカレート・デ
インターカレート可能な酸化物または炭素材料のような
正極活物質を用いることが好ましい。このような電極を
用いることにより、良好な特性のリチウム二次電池を得
ることができる。For the negative electrode, a negative electrode active material such as a carbon material, lithium metal, lithium alloy or oxide material is used. For the positive electrode, an oxide or carbon material capable of intercalating / deintercalating lithium ions is used. It is preferable to use such a positive electrode active material as described above. By using such an electrode, a lithium secondary battery having excellent characteristics can be obtained.
【００３９】電極活物質として用いる炭素材料は、例え
ば、メソカーボンマイクロビーズ（ＭＣＭＢ）、天然あ
るいは人造の黒鉛、樹脂焼成炭素材料、カーボンブラッ
ク、炭素繊維などから適宜選択すればよい。これらは粉
末として用いられる。中でも黒鉛が好ましく、その平均
粒子径は１〜３０μm 、特に５〜２５μm であることが
好ましい。平均粒子径が小さすぎると、充放電サイクル
寿命が短くなり、また、容量のばらつき（個体差）が大
きくなる傾向にある。平均粒子径が大きすぎると、容量
のばらつきが著しく大きくなり、平均容量が小さくなっ
てしまう。平均粒子径が大きい場合に容量のばらつきが
生じるのは、黒鉛と集電体との接触や黒鉛同士の接触に
ばらつきが生じるためと考えられる。The carbon material used as the electrode active material may be appropriately selected from, for example, mesocarbon microbeads (MCMB), natural or artificial graphite, resin fired carbon material, carbon black, carbon fiber and the like. These are used as powders. Above all, graphite is preferred, and its average particle size is preferably 1 to 30 μm, particularly preferably 5 to 25 μm. If the average particle size is too small, the charge / discharge cycle life tends to be short and the variation in capacity (individual difference) tends to be large. If the average particle size is too large, the dispersion of the capacity becomes extremely large, and the average capacity becomes small. It is considered that the capacity variation occurs when the average particle size is large because the contact between the graphite and the current collector and the contact between the graphites vary.
【００４０】リチウムイオンがインターカレート・デイ
ンターカレート可能な酸化物としては、リチウムを含む
複合酸化物が好ましく、例えば、ＬｉＣｏＯ2、ＬｉＭ
ｎ2Ｏ 4、ＬｉＮｉＯ2、ＬｉＶ2Ｏ4などが挙げられる。
これらの酸化物の粉末の平均粒子径は１〜４０μm 程度
であることが好ましい。Lithium ion is intercalated day
Intercalatable oxides include lithium
Complex oxides are preferred, for example, LiCoOTwo, LiM
nTwoO Four, LiNiOTwo, LiVTwoOFourAnd the like.
The average particle size of these oxide powders is about 1 to 40 μm.
It is preferred that
【００４１】電極には、必要により導電助剤が添加され
る。導電助剤としては、好ましくは黒鉛、カーボンブラ
ック、炭素繊維、ニッケル、アルミニウム、銅、銀等の
金属が挙げられ、特に黒鉛、カーボンブラックが好まし
い。If necessary, a conductive additive is added to the electrode. Preferred examples of the conductive auxiliary agent include metals such as graphite, carbon black, carbon fiber, nickel, aluminum, copper, and silver. Particularly, graphite and carbon black are preferable.
【００４２】電極組成は、正極では、重量比で、活物
質：導電助剤：ゲル電解質＝３０〜９０：３〜１０：１
０〜７０の範囲が好ましく、負極では、重量比で、活物
質：導電助剤：ゲル電解質＝３０〜９０：０〜１０：１
０〜７０の範囲が好ましい。ゲル電解質は、特に限定さ
れず、通常用いられているものを用いればよい。また、
ゲル電解質を含まない電極も好適に用いられる。この場
合、バインダとしてはフッ素樹脂、フッ素ゴム等を用い
ることができ、バインダの量は３〜３０質量％程度とす
る。The electrode composition of the positive electrode is as follows: active material: conductive auxiliary agent: gel electrolyte = 30 to 90: 3 to 10: 1 by weight.
The range of 0 to 70 is preferable. In the negative electrode, active material: conductive auxiliary agent: gel electrolyte = 30 to 90: 0 to 10: 1 by weight ratio.
A range from 0 to 70 is preferred. The gel electrolyte is not particularly limited, and a commonly used gel electrolyte may be used. Also,
An electrode containing no gel electrolyte is also preferably used. In this case, a fluororesin, a fluororubber, or the like can be used as the binder, and the amount of the binder is about 3 to 30% by mass.
【００４３】電極の製造は、まず、活物質と必要に応じ
て導電助剤を、ゲル電解質溶液またはバインダ溶液に分
散し、塗布液を調製する。In the production of an electrode, first, an active material and, if necessary, a conductive auxiliary are dispersed in a gel electrolyte solution or a binder solution to prepare a coating solution.
【００４４】そして、この電極塗布液を集電体に塗布す
る。塗布する手段は特に限定されず、集電体の材質や形
状などに応じて適宜決定すればよい。一般に、メタルマ
スク印刷法、静電塗装法、ディップコート法、スプレー
コート法、ロールコート法、ドクターブレード法、グラ
ビアコート法、スクリーン印刷法等が使用されている。
その後、必要に応じて、平板プレス、カレンダーロール
等により圧延処理を行う。Then, this electrode coating solution is applied to a current collector. The means for applying is not particularly limited, and may be determined as appropriate according to the material and shape of the current collector. Generally, a metal mask printing method, an electrostatic coating method, a dip coating method, a spray coating method, a roll coating method, a doctor blade method, a gravure coating method, a screen printing method, and the like are used.
Thereafter, if necessary, a rolling treatment is performed by a flat plate press, a calender roll, or the like.
【００４５】集電体は、電池の使用するデバイスの形状
やケース内への集電体の配置方法などに応じて、適宜通
常の集電体から選択すればよい。一般に、正極にはアル
ミニウム等が、負極には銅、ニッケル等が使用される。
なお、集電体は金属箔、金属メッシュなどが、通常、使
用される。金属箔よりも金属メッシュの方が電極との接
触抵抗が小さくなるが、金属箔でも十分小さな接触抵抗
が得られる。The current collector may be appropriately selected from ordinary current collectors according to the shape of the device used by the battery, the method of disposing the current collector in the case, and the like. Generally, aluminum or the like is used for the positive electrode, and copper, nickel, or the like is used for the negative electrode.
Note that a metal foil, a metal mesh, or the like is generally used as the current collector. Although the metal mesh has lower contact resistance with the electrode than the metal foil, a sufficiently low contact resistance can be obtained even with the metal foil.
【００４６】そして、溶媒を蒸発させ、電極を作製す
る。塗布厚は、５０〜４００μm 程度とすることが好ま
しい。Then, the solvent is evaporated to produce an electrode. The coating thickness is preferably about 50 to 400 μm.
【００４７】高分子膜は、例えば、ＰＥＯ（ポリエチレ
ンオキシド））系、ＰＡＮ（ポリアクリロニトリル）
系、ＰＶＤＦ（ポリフッ化ビニリデン）系等の高分子微
多孔膜を用いることができる。The polymer film is made of, for example, PEO (polyethylene oxide), PAN (polyacrylonitrile)
And a polymer microporous membrane such as PVDF (polyvinylidene fluoride).
【００４８】このような正極、高分子膜、負極をこの順
に積層し、圧着して電池素体とする。The positive electrode, the polymer film, and the negative electrode are laminated in this order, and pressed to form a battery body.
【００４９】高分子膜に含浸させる電解液は一般に電解
質塩と溶媒よりなる。電解質塩としては、例えば、Ｌｉ
ＢＦ4 、ＬｉＰＦ6 、ＬｉＡｓＦ6 、ＬｉＳＯ3 Ｃ
Ｆ3 、ＬｉＣｌＯ4 、ＬｉＮ（ＳＯ2 ＣＦ3 ）2 等のリ
チウム塩が適用できる。The electrolyte for impregnating the polymer membrane generally comprises an electrolyte salt and a solvent. As the electrolyte salt, for example, Li
BF 4 , LiPF 6 , LiAsF 6 , LiSO 3 C
Lithium salts such as F 3 , LiClO 4 , and LiN (SO 2 CF 3 ) 2 can be used.
【００５０】電解液の溶媒としては、前述の高分子固体
電解質、電解質塩との相溶性が良好なものであれば特に
制限はされないが、リチウム電池等では高い動作電圧で
も分解の起こらない極性有機溶媒、例えば、エチレンカ
ーボネート（略称ＥＣ）、プロピレンカーボネート（略
称ＰＣ）、ブチレンカーボネート、ジメチルカーボネー
ト（略称ＤＭＣ）、ジエチルカーボネート、エチルメチ
ルカーボネート等のカーボネート類、テトラヒドロフラ
ン（ＴＨＦ）、２−メチルテトラヒドロフラン等の環式
エーテル、１，３−ジオキソラン、４−メチルジオキソ
ラン等の環式エーテル、γ−ブチロラクトン等のラクト
ン、スルホラン等が好適に用いられる。３−メチルスル
ホラン、ジメトキシエタン、ジエトキシエタン、エトキ
シメトキシエタン、エチルジグライム等を用いてもよ
い。The solvent of the electrolytic solution is not particularly limited as long as it has good compatibility with the above-mentioned solid polymer electrolyte and electrolyte salt, but in a lithium battery or the like, a polar organic solvent which does not decompose even at a high operating voltage. Solvents, for example, carbonates such as ethylene carbonate (abbreviation EC), propylene carbonate (abbreviation PC), butylene carbonate, dimethyl carbonate (abbreviation DMC), diethyl carbonate and ethyl methyl carbonate, tetrahydrofuran (THF), 2-methyltetrahydrofuran and the like A cyclic ether, a cyclic ether such as 1,3-dioxolan, 4-methyldioxolan, a lactone such as γ-butyrolactone, a sulfolane, and the like are preferably used. 3-Methylsulfolane, dimethoxyethane, diethoxyethane, ethoxymethoxyethane, ethyldiglyme and the like may be used.
【００５１】溶媒と電解質塩とで電解液を構成すると考
えた場合の電解質塩の濃度は、好ましくは０．３〜５mo
l/lである。通常、１mol/l辺りで最も高いイオン伝導性
を示す。When it is considered that the electrolyte is composed of the solvent and the electrolyte salt, the concentration of the electrolyte salt is preferably 0.3 to 5 mol.
l / l. Usually, it exhibits the highest ionic conductivity at around 1 mol / l.
【００５２】このような電解液に微多孔性の高分子膜を
浸漬すると、高分子膜が電解液を吸収してゲル化し、高
分子固体電解質となる。When a microporous polymer film is immersed in such an electrolytic solution, the polymer film absorbs the electrolytic solution and gels to form a solid polymer electrolyte.
【００５３】高分子固体電解質の組成を共重合体／電解
液で示した場合、膜の強度、イオン伝導度の点から、電
解液の比率は４０〜９０質量％が好ましい。When the composition of the solid polymer electrolyte is represented by copolymer / electrolyte, the ratio of the electrolyte is preferably 40 to 90% by mass in view of the strength of the membrane and the ionic conductivity.
【００５４】＜電気二重層キャパシタ＞本発明の電気二
重層キャパシタの構造は特に限定されないが、通常、一
対の分極性電極が高分子固体電解質を介して配置されて
おり、分極性電極および高分子固体電解質の周辺部には
絶縁性ガスケットが配置されている。このような電気二
重層キャパシタはペーパー型、積層型等と称されるいず
れのものであってもよい。<Electric Double Layer Capacitor> Although the structure of the electric double layer capacitor of the present invention is not particularly limited, usually, a pair of polarizable electrodes is arranged via a polymer solid electrolyte, and the polarizable electrode and the polymer An insulating gasket is arranged around the solid electrolyte. Such an electric double layer capacitor may be any type called a paper type, a laminated type, or the like.
【００５５】分極性電極としては、活性炭、活性炭素繊
維等を導電性活物質とし、これにバインダとしてフッ素
樹脂、フッ素ゴム等を加える。そして、この混合物をシ
ート状電極に形成したものを用いることが好ましい。バ
インダの量は５〜１５質量％程度とする。また、バイン
ダとしてゲル電解質を用いてもよい。As the polarizable electrode, activated carbon, activated carbon fiber, or the like is used as a conductive active material, and a fluororesin, a fluororubber, or the like is added as a binder. Then, it is preferable to use the mixture formed on a sheet-like electrode. The amount of the binder is about 5 to 15% by mass. Further, a gel electrolyte may be used as the binder.
【００５６】分極性電極に用いられる集電体は、白金、
導電性ブチルゴム等の導電性ゴムなどであってよく、ま
たアルミニウム、ニッケル等の金属の溶射によって形成
してもよく、上記電極層の片面に金属メッシュを付設し
てもよい。The current collector used for the polarizable electrode is platinum,
It may be a conductive rubber such as a conductive butyl rubber or the like, may be formed by spraying a metal such as aluminum or nickel, or may be provided with a metal mesh on one surface of the electrode layer.
【００５７】電気二重層キャパシタには、上記のような
分極性電極と高分子固体電解質とを組み合わせる。The electric double layer capacitor is formed by combining the above-mentioned polarizable electrode and a solid polymer electrolyte.
【００５８】高分子膜は、例えば、ＰＥＯ（ポリエチレ
ンオキシド））系、ＰＡＮ（ポリアクリロニトリル）
系、ＰＶＤＦ（ポリフッ化ビニリデン）系等の高分子微
多孔膜を用いることができる。The polymer film is made of, for example, PEO (polyethylene oxide), PAN (polyacrylonitrile)
And a polymer microporous membrane such as PVDF (polyvinylidene fluoride).
【００５９】電解質塩としては、（Ｃ2Ｈ5）4 ＮＢ
Ｆ4 、（Ｃ2Ｈ5）3 ＣＨ3 ＮＢＦ4 、（Ｃ2Ｈ5）4 ＰＢ
Ｆ4 等が挙げられる。As the electrolyte salt, (C 2 H 5 ) 4 NB
F 4 , (C 2 H 5 ) 3 CH 3 NBF 4 , (C 2 H 5 ) 4 PB
F 4, and the like.
【００６０】電解液に用いる非水溶媒は、公知の種々の
ものであってよく、電気化学的に安定な非水溶媒である
プロピレンカーボネート、エチレンカーボネート、γ−
ブチロラクトン、アセトニトリル、ジメチルホルムアミ
ド、１，２−ジメトキシエタン、スルホラン単独または
混合溶媒が好ましい。The non-aqueous solvent used for the electrolytic solution may be various known ones, and propylene carbonate, ethylene carbonate, γ-
Butyrolactone, acetonitrile, dimethylformamide, 1,2-dimethoxyethane, sulfolane alone or a mixed solvent is preferred.
【００６１】このような非水溶媒系の電解質溶液におけ
る電解質の濃度は、０．１〜３mol/lとすればよい。The concentration of the electrolyte in such a non-aqueous solvent-based electrolyte solution may be 0.1 to 3 mol / l.
【００６２】このような電解液に微多孔性の高分子膜を
浸漬すると、高分子膜が電解液を吸収してゲル化し、高
分子固体電解質となる。When a microporous polymer film is immersed in such an electrolytic solution, the polymer film absorbs the electrolytic solution and gels to form a solid polymer electrolyte.
【００６３】高分子固体電解質の組成を共重合体／電解
液で示した場合、膜の強度、イオン伝導度の点から、電
解液の比率は４０〜９０質量％が好ましい。When the composition of the solid polymer electrolyte is represented by copolymer / electrolyte, the ratio of the electrolyte is preferably 40 to 90% by mass in view of the strength of the membrane and the ionic conductivity.
【００６４】絶縁性ガスケットとしては、ポリプロピレ
ン、ブチルゴム等の絶縁体を用いればよい。As the insulating gasket, an insulator such as polypropylene or butyl rubber may be used.
【００６５】[0065]
【実施例】以下、本発明について、更に、実施例により
に説明する。 ＜実施例＞負極とゲル状電解質と正極を交互に積層して
図１に示すような構成の電池を作製した。内部電極であ
る正極集電体４のタブには超音波溶接機を用いて外部電
極であるアルミ箔のリード３を接続した。また、負極集
積体６のタブには電気抵抗溶接機を用いてニッケル箔を
溶接した。このとき正極４のタブとリード３の接続の引
つ張り強度は６．３gf／mm2 であった。EXAMPLES Hereinafter, the present invention will be further described with reference to examples. <Example> A battery having a configuration as shown in FIG. 1 was produced by alternately stacking a negative electrode, a gel electrolyte, and a positive electrode. An aluminum electrode lead 3 as an external electrode was connected to a tab of the positive electrode current collector 4 as an internal electrode using an ultrasonic welding machine. Nickel foil was welded to the tab of the negative electrode assembly 6 using an electric resistance welding machine. At this time, the tensile strength at the connection between the tab of the positive electrode 4 and the lead 3 was 6.3 gf / mm 2 .
【００６６】さらにこれをアルミラミネートフィルムで
形成された外装袋２に入れ、正極４のタブ部とリード３
をアルミラミネートフィルム２にマレイン酸変性ポリプ
ロピレンを用いて接着した。ここで、樹脂によって接着
されたタブ及びリードとアルミラミネートフィルムの引
っ張り強度は共に６３gf／mm2 であった。これを減圧下
で密閉して電池を作成した。Further, this was put in an outer bag 2 formed of an aluminum laminated film, and the tab portion of the positive electrode 4 and the lead 3 were formed.
Was bonded to the aluminum laminate film 2 using maleic acid-modified polypropylene. Here, the tensile strength of the aluminum laminate film and the tab and the lead bonded by the resin were both 63 gf / mm 2 . This was sealed under reduced pressure to produce a battery.
【００６７】この電池を端子間電圧５．０Ｖまで１．０
Ａの一定電流で充電し、その後５．０Ｖに保つように電
流を制御しながら充電を行った。試験開始から約６６分
でガスが発生して外装袋が膨らみ始めたが、その約３０
秒後に正極集電体のタブとリードの接続がはずれて電流
が遮断された。The battery was charged to a terminal voltage of 5.0 V for 1.0 V.
The battery was charged with a constant current of A, and then charged while controlling the current so as to keep the voltage at 5.0 V. About 66 minutes after the start of the test, gas was generated and the outer bag began to expand.
After a few seconds, the connection between the tab of the positive electrode current collector and the lead was disconnected, and the current was interrupted.
【００６８】その後電流が流れない状態で保持され、破
裂、発火は起きなかった。Thereafter, the current was maintained in a state where no current flowed, and no rupture or ignition occurred.
【００６９】＜比較例＞正極集電体のタブとリードをア
ルミラミネートフィルムに接着しないことをのぞいて実
施例と同じ条件で電池を作成し、充電を行った。Comparative Example A battery was prepared and charged under the same conditions as in the example except that the tab and the lead of the positive electrode current collector were not bonded to the aluminum laminate film.
【００７０】試験開始から約６５分でガスが発生して外
装袋が膨らみ始めた。その後電流は流れ続けて試験開始
後７０分で破裂、発火した。About 65 minutes after the start of the test, gas was generated and the outer bag began to expand. Thereafter, the current continued to flow and burst and ignited 70 minutes after the start of the test.
【００７１】[0071]
【発明の効果】以上のように、本発明の電気化学デバイ
スによれば、柔軟性のあるフィルムを外装袋に用いた二
次電池などの電気化学デバイスにおいて、保護保護回路
を有することなく、ガスが発生するような異常時に電流
が流れないようにする安全機構を提供することができ
る。As described above, according to the electrochemical device of the present invention, in an electrochemical device such as a secondary battery in which a flexible film is used for an outer bag, a gas is provided without having a protection circuit. It is possible to provide a safety mechanism for preventing a current from flowing at the time of an abnormality such as the occurrence of an error.
【図１】本発明の電気化学デバイスの構造を示した一部
断面図である。FIG. 1 is a partial cross-sectional view showing a structure of an electrochemical device of the present invention.
【図２】図１の外装袋が膨らんだ状態を示した図であ
る。FIG. 2 is a view showing a state in which an outer bag of FIG. 1 is inflated.
【図３】電気化学素子の構造を示す分解斜視図である。FIG. 3 is an exploded perspective view showing the structure of the electrochemical device.
【図４】本発明の電気化学デバイスの他の構造を示した
斜視図である。FIG. 4 is a perspective view showing another structure of the electrochemical device of the present invention.
【図５】本発明の電気化学デバイスの他の構造を示した
一部断面図である。FIG. 5 is a partial cross-sectional view showing another structure of the electrochemical device of the present invention.
【図６】図５の外装袋が膨らんだ状態を示した図であ
る。FIG. 6 is a view showing a state where the outer bag of FIG. 5 is inflated.
２ 外装袋 ３ 外部電極（導出端子） ４ 正極 ５ 電解質 ６ 負極 ７ 接着剤（シール部） ８，９ 接着剤 １１ 接続部 2 Outer bag 3 External electrode (lead terminal) 4 Positive electrode 5 Electrolyte 6 Negative electrode 7 Adhesive (seal part) 8, 9 Adhesive 11 Connection part
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5H022 AA09 BB12 CC08 CC12 CC16 KK01 5H029 AJ12 AK03 AK06 AK07 AK08 AL03 AL06 AL07 AL08 AL12 AM00 AM03 AM04 AM05 AM07 AM16 BJ04 BJ12 CJ05 DJ02 DJ05 DJ07 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H022 AA09 BB12 CC08 CC12 CC16 KK01 5H029 AJ12 AK03 AK06 AK07 AK08 AL03 AL06 AL07 AL08 AL12 AM00 AM03 AM04 AM05 AM07 AM16 BJ04 BJ12 CJ05 DJ02 DJ05 DJ07
Claims (5)
に封入される電気化学素子とを有する電気化学デバイス
であって、 前記電気化学素子は、内部電極と、この内部電極と電気
的に接続され外装袋外に導出されている外部電極とを有
し、 前記外装袋の内部空間の膨張による応力を検出して少な
くとも前記内部電極と外部電極とのいずれかの電気的接
続を遮断する電流遮断手段を有する電気化学デバイス。1. An electrochemical device comprising: a flexible outer bag; and an electrochemical element sealed in the outer bag, wherein the electrochemical element includes an internal electrode, And an external electrode connected to the external bag and led out of the external bag. Detecting a stress caused by expansion of the internal space of the external bag and interrupting at least one of the internal electrode and the external electrode. An electrochemical device having current interrupting means.
極との機械的接続を前記応力により破壊する請求項１の
電気化学デバイス。2. The electrochemical device according to claim 1, wherein said current interrupting means breaks a mechanical connection between an internal electrode and an external electrode by said stress.
袋の内部空間の膨張による応力が、それぞれの接続を破
壊するように外装袋と接続されている請求項１または２
の電気化学デバイス。3. The outer bag according to claim 1, wherein the inner electrode and the outer electrode are connected to each other so that a stress caused by expansion of an inner space of the outer bag breaks each connection.
Electrochemical device.
袋と接着され、外部電極の一部が引っ張り強度Ｂで外装
袋と接着されており、内部電極と外部電極とが引っ張り
強度Ｃ接続されているとき、Ａ＞ＣかつＢ＞Ｃである請
求項１〜３のいずれかの電気化学デバイス。4. A part of the internal electrode is adhered to the outer bag with a tensile strength of A, and a part of the external electrode is adhered to the outer bag with a tensile strength of B. The internal electrode and the external electrode are connected by a tensile strength of C. The electrochemical device according to any one of claims 1 to 3, wherein A> C and B> C when performed.
いずれかの電気化学デバイス。5. The electrochemical device according to claim 1, which is a lithium secondary battery.
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| JP2000181676A JP4132588B2 (en) | 2000-06-16 | 2000-06-16 | Electrochemical devices |
| US09/809,091 US6653018B2 (en) | 2000-03-17 | 2001-03-16 | Electrochemical device |
| CNB011207558A CN1236507C (en) | 2000-03-17 | 2001-03-16 | Electrochemical device |
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|---|---|---|---|
| JP2000181676A JP4132588B2 (en) | 2000-06-16 | 2000-06-16 | Electrochemical devices |
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| JP2002008629A true JP2002008629A (en) | 2002-01-11 |
| JP4132588B2 JP4132588B2 (en) | 2008-08-13 |
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