JP2003100571A - Electric double layer capacitor - Google Patents

Electric double layer capacitor

Info

Publication number
JP2003100571A
JP2003100571A JP2001294179A JP2001294179A JP2003100571A JP 2003100571 A JP2003100571 A JP 2003100571A JP 2001294179 A JP2001294179 A JP 2001294179A JP 2001294179 A JP2001294179 A JP 2001294179A JP 2003100571 A JP2003100571 A JP 2003100571A
Authority
JP
Japan
Prior art keywords
electric double
layer capacitor
double layer
pressure release
release valve
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.)
Pending
Application number
JP2001294179A
Other languages
Japanese (ja)
Inventor
Hitoshi Nakamura
仁 中村
Michio Okamura
廸夫 岡村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OKUMURA LAB Inc
OKUMURA LABORATORY Inc
Power System Co Ltd
Original Assignee
OKUMURA LAB Inc
OKUMURA LABORATORY Inc
Power System Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by OKUMURA LAB Inc, OKUMURA LABORATORY Inc, Power System Co Ltd filed Critical OKUMURA LAB Inc
Priority to JP2001294179A priority Critical patent/JP2003100571A/en
Publication of JP2003100571A publication Critical patent/JP2003100571A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/13Energy storage using capacitors

Abstract

PROBLEM TO BE SOLVED: To provide an electric double layer capacitor which is sealed with a flexible cladding attached with a pressure releasing valve. SOLUTION: The electric double layer capacitor is sealed with the flexible cladding and connected with the pressure releasing valve having rubber elasticity at the inner surface of the flexible cladding. The pressure releasing valve is provided with an opening which is closed when the difference between the outside and inside pressures is smaller than a given value. The flexible cladding is provided with an opening which communicates with the opening of the pressure releasing valve.

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、電気二重層キャパ
シタに関するものであり、特に可撓性の外装材によって
封口した復帰可能な圧力開放弁を設けた電気二重層キャ
パシタに関するものである。 【0002】 【従来の技術】電気二重層キャパシタは、分極性電極と
電解液との界面に形成される電気二重層容量を利用した
キャパシタであり、誘電体を介在させて電極を配置した
キャパシタに比べてはるかに容量が大きなことを特徴と
しており、電気二重層キャパシタは、電力貯蔵手段にお
ける有力な手段として開発が進められている。電気二重
層キャパシタには、電解液として水系溶媒を用いたもの
と、非水系溶媒を用いたものが知られている。水系溶媒
を用いたものは、水の電気分解が起こる電圧以上の電圧
を印加することはできないが、非水溶媒電解液を用いた
ものは、水系溶媒を用いた場合に比べて高い電圧で使用
することができるという特徴を有している。 【0003】キャパシタに蓄積される電気エネルギー
は、1/2CV2 で表されるように、電圧を高くするこ
とにより電気エネルギーの貯蔵の効率が大きくなると言
う特徴を有している。したがって、非水溶媒を用いた電
解液を使用した電気二重層キャパシタは、電力貯蔵等の
エネルギー貯蔵の用途に適したものであるということが
できる。 【0004】非水溶媒電解液を用いた電気二重層キャパ
シタは、電解液中に大気中の水分が浸入すると電解液の
電気分解電圧が低下したり、あるいは非水溶媒電解液が
分解するという問題点があった。そこで、非水溶媒電解
液を用いた電気二重層キャパシタにおいては、電気二重
層キャパシタ中に大気中の水分が浸入することがないよ
うに収納容器を封口して密閉したものが用いられてい
る。非水溶媒電解液を用いた電気二重層キャパシタの単
体の動作電圧は水系電解液を用いたものに比べて高いも
のの、各種の機器を動作させるためには不充分であるた
めに、電気二重層キャパシタの単体の多数個を直列に接
続して動作電圧を高めることが行われている。 【0005】一方、自動車等の移動体の駆動用電源に利
用する場合には静電容量等の電気的特性と共に、質量が
小さく、質量あたりのエネルギー密度が大きなことが極
めて重要となる。このため、移動体の電源用に用いる場
合には、金属缶を外装材としたものに代えて、質量が小
さな合成樹脂製フィルムをアルミニウム箔等と積層した
可撓性外装材を用いた電気二重層キャパシタが好ましい
ものと考えられている。 【0006】また、電気二重層キャパシタにおいては、
二次電池のように物質の化学的な変化を伴わないために
電極の劣化等が小さいものの、電解液等の使用材料の分
解、材料中に吸着されていた水分の脱着等によって内部
の圧力が高まることがあった。リチウムイオン電池等の
非水電解液二次電池における気体の発生による内部の圧
力の増加の場合には、化学変化が進み電池としての機能
が失われ、回復不可能となることが一般的である。した
がって、これらの電池に設ける圧力開放弁は、薄肉部が
開裂あるいは破断する復帰不可能なものが用いられてい
た。 【0007】一方、電気二重層キャパシタにおいては、
圧力開放弁の作動に伴い電解液が失われた場合であって
も電解液が所定の量以下に低下しない限り、その後も引
き続き利用することが可能であるという特徴を有してお
り、電気二重層キャパシタにおいて、復帰可能な圧力開
放弁を装着することは極めて有効な手段である。復帰可
能な圧力開放弁としては、ばねの反発力を用いたもの等
が数多く知られているが、合成樹脂フィルムのような可
撓性の部材を用いた電気二重層キャパシタにおいて、可
撓性の外装材への装着が容易な小型の回復可能な圧力開
放弁はなかった。本発明者らは、圧力開放弁を有する可
撓性の外装材を有する電気二重層キャパシタを特願20
01−80180として提案しているが、圧力開放弁を
構成する各部材の状態によっては、電解液中から支持電
解質等が漏れ出て析出物が圧力開放弁の外側に付着する
ことがあった。 【0008】 【発明が解決しようとする課題】本発明は、非水溶媒電
解液を用いた電気二重層キャパシタにおいて、可撓性の
外装材に対して復帰可能な圧力開放弁を取り付けること
を可能とし、性能を長期に維持することが可能な電気二
重層キャパシタを提供することを課題とするものであ
る。 【0009】 【課題を解決するための手段】本発明の課題は、可撓性
の外装材によって封口した電気二重層キャパシタにおい
て、可撓性の外装材の内面に自己封鎖性通路を形成した
圧力開放弁を有し、可撓性の外装材には、圧力開放弁に
設けた自己閉鎖性通路と連通する開口が形成された電気
二重層キャパシタによって解決することができる。圧力
開放弁に設けた自己閉鎖性通路は、通路の両側の圧力差
が所定の大きさよりも小さい場合には、通路が連通しな
い前記の電気二重層キャパシタである。圧力開放弁がゴ
ム弾性を有する部材からなる前記の電気二重層キャパシ
タである。また、可撓性の外装材の内面には熱融着性合
成樹脂層が形成されており、ゴム弾性を有する圧力開放
弁が熱融着されている前記の電気二重層キャパシタであ
る。圧力開放弁がゴム弾性を有する部材の表面に熱融着
性合成樹脂層が形成されたものである前記の電気二重層
キャパシタである。ゴム弾性を有する部材がエチレンプ
ロピレン共重合体、エチレンプロピレンジエン共重合体
である前記の電気二重層キャパシタである。 【0010】また、可撓性の外装材によって封口した電
気二重層キャパシタの製造方法において、内面にゴム弾
性を有する部材を熱融着によって接合した後に、ゴム弾
性を有する部材の両側の圧力差が所定の大きさ以下の場
合には両側の間の連通が遮断される開孔を可撓性の外装
材を含めて圧力開放弁を形成した後に、可撓性の外装材
によって電気二重層キャパシタ要素を電解液注液口を除
いて封口し、可撓性の外装材に形成された圧力開放口を
一時的に封止材によって封止した状態で減圧して内部の
気体を除去した後に、電解液を注液した後に電解液を注
液口を封口し、圧力開放口の封止材を除去した電気二重
層キャパシタの製造方法である。 【0011】 【発明の実施の形態】本発明は、非水溶媒電解液を用い
た可撓性の外装材によって封口した電気二重層キャパシ
タにおいて、電気二重層キャパシタ内部の圧力を復帰可
能な圧力開放弁を用いて開放した後には、再度電気二重
層キャパシタを使用することが可能であり、また定常状
態では、大きな圧力で密閉しなくとも比較的小さな密着
力によって水分等の浸入を防止することができ、電気二
重層キャパシタの性能を維持することが可能であること
を見出し本発明を想到したものである。 【0012】そして、ゴム弾性を有する材料を用い、先
端が鋭利な工具によって開孔を形成するのみで、ゴム弾
性を有する部材の両側の圧力差が所定の大きさよりも小
さい場合には両側の連通が遮断され、圧力差が所定の大
きさ以上の場合には連通孔が形成されて内部の圧力の開
放が可能な圧力開放弁を設けることによって品質の優れ
た電気二重層キャパシタが得られることを見いだしたも
のである。 【0013】以下に、図面を参照して本発明を説明す
る。図1は、本発明の電気二重層キャパシタを説明する
図であり、一部を切り欠いた斜視図である。本発明の電
気二重層キャパシタ1は、非水溶媒電解液を用いたもの
であり、キャパシタ要素2は可撓性の外装材3によって
封口されており、可撓性の外装材3の内側には、ゴム弾
性を有する物質からなる圧力開放弁4が接合されてい
る。圧力開放弁4には、表裏の圧力差が所定の大きさよ
りも小さい場合に連通路を遮断される自己閉鎖性通路9
が設けられており、可撓性の外装材に設けた開孔と連通
している。そして、電気二重層キャパシタ内部の圧力が
所定の圧力以上に増加した場合には、圧力開放弁4が作
動して内部圧力を開放することができ、内部圧力の開放
の後には再度電気二重層キャパシタとして使用可能であ
るという特徴を有している。 【0014】圧力開放弁には、表裏の圧力差が所定の大
きさよりも小さい場合に連通路を遮断する自己閉鎖性通
路を有したものであるので、通常状態では、圧力開放弁
は遮断された状態であって、電気二重層キャパシタ内部
から電解液が漏出したり、電解液中の支持塩が析出する
おそれがない特性の優れた電気二重層キャパシタを提供
することができる。 【0015】図2は、本発明の電気二重層キャパシタの
圧力開放弁を説明する図である。図2(A)は、可撓性
部材へ取り付けた圧力開放弁を説明する断面図である。
また、図2(B)、図2(C)は、圧力開放弁の開孔の
形状を説明する平面図である。また図2(D)は、他の
形態の圧力開放弁を説明する断面図である。図2(A)
に示すように、圧力開放弁4は可撓性の外装材3に熱融
着されている。可撓性の外装材3は、中心部にアルミニ
ウム箔等の金属箔6を有し、電気二重層キャパシタの外
面側には、ポリエチレンテレフタレート等の外面層7を
有しており、電気二重層キャパシタの内面側には、熱融
着性を有するポリエチレン、ポリプロピレン等の易接合
層8を有している。そして、易接合層には圧力開放弁4
を熱融着によって接合される。圧力開放弁4は、ゴム弾
性を有する物質によって形成されており、圧力開放弁に
設けた開孔5は、内外の圧力差が所定の大きさよりも小
さい場合には、自己閉鎖性通路9は、ゴム弾性によって
遮断されて閉じられる。したがって、内部の圧力差が所
定の値よりも小さい場合には、自己閉鎖性通路9が閉じ
られているので、電気二重層キャパシタの内部の封口が
保持される。 【0016】図2(B)に示すように、本発明の圧力開
閉弁4に設ける開孔5は、断面が円形状の鋭利な器具を
突き刺すことによって形成したものであっても、図2
(C)に示すように、先端部が尖ったナイフ状の鋭利な
器具によって形成したものであっても良い。しかしなが
ら、部材の一部を実質的に除去するような器具によって
開孔を形成した場合には、圧力開放弁の両面の圧力差が
生じていない場合の封止特性が悪化するので好ましくな
い。 【0017】本発明の圧力開放弁としては、ゴム弾性を
有する部材を図2(A)に示すように、可撓性部材の内
面に設けた易接合層に直接熱融着することによって接合
可能であるが、図2(D)に示すように、圧力開放弁4
は、ゴム弾性部材10と、可撓性部材の易接合層との接
合特性が良好な易接合性部材11とをあらかじめ積層一
体化して製造した複合材であっても良い。これによっ
て、可撓性部材の易接合層との接合性が大きくないゴム
弾性部材を用いることができる。また、圧力開放弁の形
状は、装着個所に応じて任意の形状のものを用いること
ができるが、円盤状、矩形上のものを挙げることができ
る。 【0018】本発明の圧力開放弁に用いることができる
ゴム弾性部材としては、ゴム弾性によって自己閉鎖性通
路を形成することができ、非水電解液に対して安定なエ
チレンプロピレン共重合体(EPT)、エチレンプロピ
レンジエン共重合体(EPDM)等のオレフィン系の合
成ゴム、シリコーンゴム、フッ素ゴム等を挙げることが
できる。オレフィン系の合成ゴムは、可撓性の外装材の
易接合層として用いられているポリエチレン層との熱融
着特性が良好であるので好ましい。また、圧力開放弁の
ゴム弾性体としては、厚さが0.8mm〜2mmの部材
を用いることによって、大気圧下での密閉性を安定に保
持することができる。 【0019】図3は、本発明の電気二重層キャパシタの
製造工程を説明する図である。図3(A)に平面図を示
すように、可撓性の外装材3の所定の個所に圧力開放弁
用のゴム弾性部材10を熱融着する。次いで、図3
(B)に断面図を示すように、ゴム弾性部材10の面か
ら、断面が円形状の先端が鋭利な穿孔工具12によっ
て、穿孔工具12の先端が可撓性外装材の表面にまで貫
通するまで穿孔して圧力開放弁4を作製する。 【0020】次いで、図3(C)に部分斜視図を示すよ
うに、以上のようにして作製した圧力開放弁を設けた可
撓性の外装材によって電気二重層キャパシタ要素を被覆
して、電解液注液口13を除いて封口し、電気二重層キ
ャパシタの外面に形成された開孔5を粘着性テープ等の
封口部材14によって一時的に封口を行う。そして、電
解液注液口13から内部の気体を排気した後に、非水電
解液を注液し、更に電解液注液口を封口した後に、封口
部材14を取り去って電気二重層キャパシタを作製す
る。 【0021】 【発明の効果】本発明は、可撓性の外装材を用いて封口
した電気二重層キャパシタにおいて、大幅な質量の増加
を伴うことなく、平常時の密閉性が優れた圧力開放弁を
装着したので、使用時に内部圧力が増大した場合にも安
全に内部圧力を開放することが可能な電気二重層キャパ
シタを得ることができる。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric double-layer capacitor, and more particularly to an electric double-layer capacitor provided with a resettable pressure relief valve sealed with a flexible outer material. It relates to a double layer capacitor. 2. Description of the Related Art An electric double layer capacitor is a capacitor utilizing an electric double layer capacitance formed at an interface between a polarizable electrode and an electrolytic solution. The electric double layer capacitor is characterized by having a much larger capacity than that of the electric double layer capacitor, and is being developed as a promising power storage means. As an electric double layer capacitor, those using an aqueous solvent as an electrolyte and those using a non-aqueous solvent are known. An aqueous solvent cannot apply a voltage higher than the voltage at which water electrolysis occurs, but a non-aqueous electrolyte uses a higher voltage than an aqueous solvent. It has the feature that it can be done. [0003] Electrical energy stored in the capacitor, 1 / 2CV as represented by 2, has a feature called the efficiency of the storage of electrical energy by increasing the voltage increases. Therefore, it can be said that an electric double layer capacitor using an electrolytic solution using a non-aqueous solvent is suitable for use in energy storage such as power storage. An electric double layer capacitor using a non-aqueous solvent electrolyte has a problem that when moisture in the air enters the electrolyte, the electrolysis voltage of the electrolyte decreases or the non-aqueous solvent electrolyte is decomposed. There was a point. Therefore, in an electric double-layer capacitor using a non-aqueous solvent electrolyte, a storage container is closed and sealed so that moisture in the atmosphere does not enter the electric double-layer capacitor. Although the operating voltage of an electric double layer capacitor using a non-aqueous solvent electrolyte is higher than that using an aqueous electrolyte, the electric double layer capacitor is insufficient to operate various devices. 2. Description of the Related Art A large number of single capacitors are connected in series to increase operating voltage. On the other hand, when used as a power supply for driving a moving body such as an automobile, it is extremely important that the mass is small and the energy density per mass is large, in addition to the electrical characteristics such as capacitance. For this reason, when used for a power source of a moving body, instead of using a metal can as an exterior material, an electric device using a flexible exterior material in which a small-weight synthetic resin film is laminated with aluminum foil or the like is used. Multilayer capacitors are considered preferred. In an electric double layer capacitor,
Unlike secondary batteries, the deterioration of the electrodes is small because they do not involve a chemical change in the material.However, the internal pressure increases due to the decomposition of the materials used, such as the electrolyte, and the desorption of moisture adsorbed in the materials. There was a growing. In the case of an increase in internal pressure due to generation of gas in a non-aqueous electrolyte secondary battery such as a lithium ion battery, it is common that chemical change proceeds and the function as a battery is lost, making it impossible to recover. . Therefore, a non-returnable pressure release valve provided in these batteries has been used in which the thin-walled portion is broken or broken. On the other hand, in an electric double layer capacitor,
Even if the electrolyte is lost due to the operation of the pressure release valve, the electrolyte can be continuously used as long as the electrolyte does not drop below a predetermined amount. In a multilayer capacitor, mounting a pressure release valve that can be returned is an extremely effective means. There are many known resettable pressure relief valves that use a spring repulsion force. However, in an electric double layer capacitor using a flexible member such as a synthetic resin film, a flexible There was no small, recoverable pressure relief valve that was easy to attach to the cladding. The present inventors have disclosed an electric double layer capacitor having a flexible sheathing material having a pressure release valve in Japanese Patent Application No.
However, depending on the state of each member constituting the pressure relief valve, the supporting electrolyte and the like may leak out of the electrolyte and deposits may adhere to the outside of the pressure relief valve. SUMMARY OF THE INVENTION The present invention enables an electric double layer capacitor using a non-aqueous solvent electrolyte to be provided with a pressure-releasing valve that can be returned to a flexible exterior material. It is an object of the present invention to provide an electric double layer capacitor capable of maintaining performance for a long time. SUMMARY OF THE INVENTION An object of the present invention is to provide a double-layer capacitor sealed with a flexible exterior material, which has a self-sealing passage formed on the inner surface of the flexible exterior material. The problem can be solved by an electric double-layer capacitor having an opening valve and having an opening formed in the flexible sheathing material and communicating with a self-closing passage provided in the pressure relief valve. The self-closing passage provided in the pressure release valve is the electric double layer capacitor in which the passage does not communicate when the pressure difference between the two sides of the passage is smaller than a predetermined value. The pressure release valve is the above-mentioned electric double layer capacitor made of a member having rubber elasticity. The electric double-layer capacitor has a heat-sealable synthetic resin layer formed on the inner surface of a flexible exterior material, and a heat-releasing pressure release valve having rubber elasticity. The electric double layer capacitor according to the above, wherein the pressure release valve is formed by forming a heat-fusible synthetic resin layer on a surface of a member having rubber elasticity. The above electric double layer capacitor, wherein the member having rubber elasticity is an ethylene propylene copolymer or an ethylene propylene diene copolymer. Further, in the method for manufacturing an electric double layer capacitor sealed with a flexible exterior material, after a member having rubber elasticity is bonded to the inner surface by heat fusion, a pressure difference between both sides of the member having rubber elasticity is reduced. In the case of a predetermined size or less, an opening for interrupting communication between both sides is formed with a pressure release valve including a flexible exterior material, and then an electric double layer capacitor element is provided by the flexible exterior material. After removing the internal gas by removing the electrolyte injection port and closing the pressure release port formed in the flexible exterior material with the temporary sealing with a sealing material to remove the internal gas, This is a method for manufacturing an electric double layer capacitor in which an electrolyte solution injection port is sealed after a liquid is injected, and a sealing material at a pressure release port is removed. DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure release capable of restoring the internal pressure of an electric double layer capacitor in an electric double layer capacitor sealed with a flexible exterior material using a non-aqueous solvent electrolyte. After opening using the valve, it is possible to use the electric double layer capacitor again, and in the steady state, it is possible to prevent infiltration of moisture etc. by a relatively small adhesion force without sealing with a large pressure. The present invention has been found that it is possible to maintain the performance of the electric double layer capacitor, and the present invention has been conceived. When a material having rubber elasticity is used and only a hole is formed by a tool having a sharp tip, when the pressure difference between both sides of the member having rubber elasticity is smaller than a predetermined value, communication between both sides is made. Is cut off, and when the pressure difference is equal to or larger than a predetermined value, a communication hole is formed and a pressure release valve capable of releasing the internal pressure is provided, so that an electric double layer capacitor having excellent quality can be obtained. That is what I found. The present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating an electric double layer capacitor of the present invention, and is a perspective view with a part cut away. The electric double layer capacitor 1 of the present invention uses a non-aqueous solvent electrolyte, and the capacitor element 2 is sealed by a flexible exterior material 3. And a pressure release valve 4 made of a material having rubber elasticity. The pressure release valve 4 has a self-closing passage 9 that shuts off the communication passage when the pressure difference between the front and back is smaller than a predetermined value.
Is provided and communicates with the opening provided in the flexible exterior material. Then, when the pressure inside the electric double layer capacitor increases to a predetermined pressure or more, the pressure release valve 4 is operated to release the internal pressure, and after the internal pressure is released, the electric double layer capacitor is again activated. It has the feature that it can be used as. Since the pressure release valve has a self-closing passage which shuts off the communication path when the pressure difference between the front and back is smaller than a predetermined value, the pressure release valve is normally shut off. In this state, it is possible to provide an electric double layer capacitor having excellent characteristics in which the electrolyte does not leak from the inside of the electric double layer capacitor and the supporting salt in the electrolyte does not precipitate. FIG. 2 is a view for explaining a pressure release valve of the electric double layer capacitor of the present invention. FIG. 2A is a cross-sectional view illustrating a pressure release valve attached to a flexible member.
FIGS. 2B and 2C are plan views illustrating the shape of the opening of the pressure release valve. FIG. 2D is a cross-sectional view illustrating another form of the pressure release valve. FIG. 2 (A)
As shown in FIG. 2, the pressure release valve 4 is heat-sealed to the flexible exterior material 3. The flexible exterior material 3 has a metal foil 6 such as an aluminum foil at the center and an outer layer 7 such as polyethylene terephthalate on the outer surface side of the electric double layer capacitor. Has an easily bonding layer 8 of heat-fusible polyethylene, polypropylene or the like. And the pressure relief valve 4
Are joined by heat fusion. The pressure release valve 4 is formed of a material having rubber elasticity. When the pressure difference between the inside and the outside is smaller than a predetermined size, the opening 5 provided in the pressure release valve has a self-closing passage 9. It is closed and closed by rubber elasticity. Therefore, when the internal pressure difference is smaller than a predetermined value, the self-closing passage 9 is closed, and the internal sealing of the electric double layer capacitor is maintained. As shown in FIG. 2B, the opening 5 provided in the pressure on-off valve 4 of the present invention can be formed by piercing a sharp instrument having a circular cross section.
As shown in (C), it may be formed by a knife-like sharp instrument with a sharp tip. However, it is not preferable that the opening is formed by an instrument that substantially removes a part of the member, since the sealing characteristics when no pressure difference is generated between both surfaces of the pressure release valve deteriorate. As the pressure release valve of the present invention, as shown in FIG. 2 (A), a member having rubber elasticity can be joined by directly heat-sealing it to an easy joining layer provided on the inner surface of the flexible member. However, as shown in FIG.
May be a composite material manufactured by previously laminating and integrating the rubber elastic member 10 and the easy-joining member 11 having good joining characteristics with the easy-joining layer of the flexible member. This makes it possible to use a rubber elastic member that does not have a large bonding property between the flexible member and the easy bonding layer. The pressure relief valve may have any shape depending on the mounting location, and examples thereof include a disk shape and a rectangular shape. As the rubber elastic member that can be used in the pressure release valve of the present invention, a self-closing passage can be formed by rubber elasticity, and an ethylene propylene copolymer (EPT) that is stable against a nonaqueous electrolyte. ), Olefin-based synthetic rubbers such as ethylene propylene diene copolymer (EPDM), silicone rubber, fluorine rubber and the like. Olefin-based synthetic rubber is preferable because it has good heat-sealing properties with a polyethylene layer used as an easy bonding layer of a flexible exterior material. Further, by using a member having a thickness of 0.8 mm to 2 mm as the rubber elastic body of the pressure release valve, the hermeticity under the atmospheric pressure can be stably maintained. FIG. 3 is a view for explaining a manufacturing process of the electric double layer capacitor of the present invention. As shown in the plan view of FIG. 3A, a rubber elastic member 10 for a pressure release valve is heat-sealed to a predetermined portion of the flexible exterior material 3. Then, FIG.
As shown in the cross-sectional view of FIG. 2B, the tip of the drilling tool 12 penetrates from the surface of the rubber elastic member 10 to the surface of the flexible exterior material by the drilling tool 12 having a circular section and a sharp tip. The pressure release valve 4 is manufactured by piercing until the pressure is released. Next, as shown in a partial perspective view of FIG. 3 (C), the electric double layer capacitor element is covered with a flexible exterior material provided with a pressure release valve manufactured as described above, The opening except for the liquid injection port 13 is sealed, and the opening 5 formed on the outer surface of the electric double layer capacitor is temporarily sealed with a sealing member 14 such as an adhesive tape. After exhausting the internal gas from the electrolyte injection port 13, a non-aqueous electrolyte is injected, and after further closing the electrolyte injection port, the sealing member 14 is removed to produce an electric double layer capacitor. . According to the present invention, there is provided a pressure release valve which is excellent in airtightness in a normal state without a large increase in mass in an electric double layer capacitor sealed with a flexible exterior material. Is mounted, an electric double layer capacitor capable of safely releasing the internal pressure even when the internal pressure increases during use can be obtained.

【図面の簡単な説明】 【図1】図1は、本発明の電気二重層キャパシタを説明
する図であり、一部を切り欠いた斜視図である。 【図2】図2は、本発明の電気二重層キャパシタの圧力
開放弁を説明する図である。 【図3】図3は、本発明の電気二重層キャパシタの製造
工程を説明する図である。 【符号の説明】 1…電気二重層キャパシタ、2…キャパシタ要素、3…
可撓性の外装材、4…圧力開放弁、5…開孔、6…金属
箔、7…外面層、8…易接合層、9…自己閉鎖性通路、
10…ゴム弾性部材、11…易接合性部材、12…穿孔
工具、13…電解液注液口、14…封口部材
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining an electric double layer capacitor of the present invention, and is a perspective view with a part cut away. FIG. 2 is a diagram illustrating a pressure release valve of the electric double layer capacitor of the present invention. FIG. 3 is a diagram illustrating a manufacturing process of the electric double layer capacitor of the present invention. [Description of Signs] 1 ... electric double layer capacitor, 2 ... capacitor element, 3 ...
Flexible exterior material, 4 ... pressure release valve, 5 ... opening, 6 ... metal foil, 7 ... outer surface layer, 8 ... easy joining layer, 9 ... self-closing passage,
DESCRIPTION OF SYMBOLS 10 ... Rubber elastic member, 11 ... Easy joining member, 12 ... Drilling tool, 13 ... Electrolyte injection port, 14 ... Sealing member

───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡村 廸夫 神奈川県横浜市南区南太田2−19−6   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Okamura Dio             2-19-6 Minamiota, Minami-ku, Yokohama, Kanagawa

Claims (1)

【特許請求の範囲】 【請求項1】 可撓性の外装材によって封口した電気二
重層キャパシタにおいて、可撓性の外装材の内面に自己
封鎖性通路を形成した圧力開放弁を有し、可撓性の外装
材には、圧力開放弁に設けた自己閉鎖性通路と連通する
開口が形成されたことを特徴とする電気二重層キャパシ
タ。
Claims: 1. An electric double layer capacitor sealed with a flexible exterior material, comprising a pressure relief valve having a self-sealing passage formed on an inner surface of the flexible exterior material. An electric double layer capacitor, wherein an opening communicating with a self-closing passage provided in a pressure release valve is formed in a flexible exterior material.
JP2001294179A 2001-09-26 2001-09-26 Electric double layer capacitor Pending JP2003100571A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001294179A JP2003100571A (en) 2001-09-26 2001-09-26 Electric double layer capacitor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001294179A JP2003100571A (en) 2001-09-26 2001-09-26 Electric double layer capacitor

Publications (1)

Publication Number Publication Date
JP2003100571A true JP2003100571A (en) 2003-04-04

Family

ID=19115829

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001294179A Pending JP2003100571A (en) 2001-09-26 2001-09-26 Electric double layer capacitor

Country Status (1)

Country Link
JP (1) JP2003100571A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006025306A1 (en) * 2004-08-30 2006-03-09 Nisshinbo Industries, Inc. Closed type capacitor
WO2008047597A1 (en) * 2006-10-16 2008-04-24 Panasonic Corporation Condenser
WO2008099578A1 (en) * 2007-02-14 2008-08-21 Panasonic Corporation Capacitor
WO2008111356A1 (en) * 2007-03-09 2008-09-18 Asahi Rubber Inc. Excessive pressure relief valve, and relief valve unit having the relief valve

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1786007A1 (en) * 2004-08-30 2007-05-16 Nisshinbo Industries, Inc. Closed type capacitor
WO2006025306A1 (en) * 2004-08-30 2006-03-09 Nisshinbo Industries, Inc. Closed type capacitor
EP1786007A4 (en) * 2004-08-30 2008-10-15 Nisshin Spinning Closed type capacitor
KR100963730B1 (en) * 2006-10-16 2010-06-14 파나소닉 주식회사 Condenser
WO2008047597A1 (en) * 2006-10-16 2008-04-24 Panasonic Corporation Condenser
US7916454B2 (en) 2006-10-16 2011-03-29 Panasonic Corporation Capacitor
WO2008099578A1 (en) * 2007-02-14 2008-08-21 Panasonic Corporation Capacitor
US8164882B2 (en) 2007-02-14 2012-04-24 Panasonic Corporation Capacitor
JP5083220B2 (en) * 2007-02-14 2012-11-28 パナソニック株式会社 Capacitor
EP2131416A1 (en) * 2007-03-09 2009-12-09 Asahi Rubber Inc. Excessive pressure relief valve, and relief valve unit having the relief valve
JPWO2008111356A1 (en) * 2007-03-09 2010-06-24 株式会社朝日ラバー Overpressure release valve and release valve unit having the same
WO2008111356A1 (en) * 2007-03-09 2008-09-18 Asahi Rubber Inc. Excessive pressure relief valve, and relief valve unit having the relief valve
EP2131416A4 (en) * 2007-03-09 2011-09-28 Asahi Rubber Inc Excessive pressure relief valve, and relief valve unit having the relief valve
JP5111490B2 (en) * 2007-03-09 2013-01-09 株式会社朝日ラバー Overpressure release valve and release valve unit having the same
US8443840B2 (en) 2007-03-09 2013-05-21 Asahi Rubber Inc. Excessive pressure release valve and release valve unit having the release valve

Similar Documents

Publication Publication Date Title
CN104380514A (en) Manufacturing method and manufacturing device for secondary battery
WO2004010517A1 (en) Film-armored battery and method of manufacturing the battery
JP2006244756A (en) Film outer packaging electric device and film packaging electric device assembly
JP2009187711A (en) Method of manufacturing electrochemical device, and electrochemical device
JP4187870B2 (en) Battery manufacturing method
KR20100124209A (en) Electric storage device
JP2011086760A (en) Energy storage element
JP2005038613A (en) Plate-shaped battery
KR20080019313A (en) Process for preparation of pouch-typed secondary battery having excellent sealing property
KR20140018014A (en) The manufacturing method of pouch type secondary battery
KR101543494B1 (en) Pouch typed battery having an electrolyte injection and/or exhaust hole
JP2010086753A (en) Power storage device
JP2011181388A (en) Electrolytic solution battery and method of manufacturing the same
JP2010049913A (en) Manufacturing method of sealed battery
JP2000173564A (en) Thin battery bag body
KR100879895B1 (en) Secondary Battery Having Improved Sealing Property at Heat-melted Portion of Case
JP2003092132A (en) Battery
JP2003100571A (en) Electric double layer capacitor
JP2001093576A (en) Non-aqueous electrolyte battery and manufacturing method thereof
JP4155217B2 (en) Method for injecting electrolyte in laminated battery
JP2004342520A (en) Manufacturing method of secondary battery
JP5224336B2 (en) Film exterior electrochemical device
WO2003098649A1 (en) Electric double-layer capacitor
KR100890160B1 (en) Secondary Battery Having Improved Sealing Property at Heat-melted Portion of Case
JP4187875B2 (en) Thin battery manufacturing method

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20041105

A711 Notification of change in applicant

Effective date: 20041217

Free format text: JAPANESE INTERMEDIATE CODE: A712

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070425

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20070511

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20070604

A02 Decision of refusal

Effective date: 20080627

Free format text: JAPANESE INTERMEDIATE CODE: A02