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JP2001044081A - Electric double-layer capacitor and manufacture thereof - Google Patents

Electric double-layer capacitor and manufacture thereof

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Publication number
JP2001044081A
JP2001044081AJP21446999AJP21446999AJP2001044081AJP 2001044081 AJP2001044081 AJP 2001044081AJP 21446999 AJP21446999 AJP 21446999AJP 21446999 AJP21446999 AJP 21446999AJP 2001044081 AJP2001044081 AJP 2001044081A
Authority
JP
Japan
Prior art keywords
activated carbon
electrolyte
electric double
layer capacitor
electrode
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
JP21446999A
Other languages
Japanese (ja)
Inventor
Toshihisa Nagasawa
寿久 長沢
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.)
NEC Toppan Circuit Solutions Toyama Inc
Original Assignee
NEC Toppan Circuit Solutions Toyama Inc
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 NEC Toppan Circuit Solutions Toyama IncfiledCriticalNEC Toppan Circuit Solutions Toyama Inc
Priority to JP21446999ApriorityCriticalpatent/JP2001044081A/en
Publication of JP2001044081ApublicationCriticalpatent/JP2001044081A/en
Pendinglegal-statusCriticalCurrent

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Abstract

PROBLEM TO BE SOLVED: To provide an electric double-layer capacitor and its manufacturing method, that improves the reliability of electric characteristics and initial characteristics, can prevent increase in internal resistance and decrease of capacitance, and can reduce time required for manufacturing. SOLUTION: The electric double-layer capacitor is equipped with activated carbon electrodes 1 and 2 of a pair of thin films where an electrolyte is impregnated, a separator 3 that is sandwiched between the inner surfaces of the activated carbon electrodes 1 and 2, and collectors 4 and 5 that collect the charge of the activated carbon electrodes 1 and 2. A groove 7 for retaining the electrolyte is formed in the activated carbon electrodes 1 and 2 and has capacity for retaining the electrolyte with the amount of dry-up presumed at use.

Description

Translated fromJapanese
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、電気二重層コンデ
ンサ及びその製造方法に関し、特に、分極性電極として
活性炭電極を用いた電気二重層コンデンサ及びその製造
方法に関する。
The present invention relates to an electric double layer capacitor and a method of manufacturing the same, and more particularly, to an electric double layer capacitor using an activated carbon electrode as a polarizable electrode and a method of manufacturing the same.

【0002】[0002]

【従来の技術】近年、電気二重層により電荷を蓄積する
電気二重層原理を利用した電気二重層コンデンサが開発
され製品化されている。電気二重層コンデンサは、例え
ば電子装置のメモリ用バックアップ電源などの用途に広
く用いられている。
2. Description of the Related Art In recent years, electric double layer capacitors utilizing the electric double layer principle of accumulating electric charges by the electric double layer have been developed and commercialized. Electric double layer capacitors are widely used for applications such as backup power supplies for memories of electronic devices.

【0003】図3(A)は、従来の電気二重層コンデン
サを示す断面図、(B)は(A)のIII−III線平面一部
断面図である。
FIG. 3A is a sectional view showing a conventional electric double-layer capacitor, and FIG. 3B is a partial sectional view taken along the line III-III of FIG.

【0004】図3(A)及び(B)に示すように、従来
の電気二重層コンデンサは、電解液を含浸した第1及び
第2の活性炭電極50、51と、第1及び第2の活性炭
電極50、51の内面の間に挟まれた多孔性のセパレー
タ52と、第1及び第2の活性炭電極50、51の外面
にそれぞれ設けられ、活性炭電極50、51の電荷を集
電する第1及び第2の集電体53、54と、第1及び第
2の活性炭電極50、51、セパレータ52、第1及び
第2の集電体53、54の外周を取り囲むガスケット5
5と、を有する。
As shown in FIGS. 3A and 3B, a conventional electric double layer capacitor comprises first and second activated carbon electrodes 50 and 51 impregnated with an electrolyte and first and second activated carbon electrodes. A porous separator 52 sandwiched between the inner surfaces of the electrodes 50 and 51 and a first separator provided on the outer surfaces of the first and second activated carbon electrodes 50 and 51, respectively, for collecting the electric charges of the activated carbon electrodes 50 and 51. And the second current collectors 53 and 54, the first and second activated carbon electrodes 50 and 51, the separator 52, and the gasket 5 surrounding the outer circumferences of the first and second current collectors 53 and 54.
And 5.

【0005】従来の電気二重層コンデンサによれば、分
極性電極となる活性炭電極50、51の電荷が集電体5
3、54に集電されてコンデンサとして機能する。ま
た、上述した基本セルを複数個接続して、静電容量を増
加させ、所望の電圧を得るように構成される(以下、こ
の技術を従来例1という)。
According to the conventional electric double layer capacitor, the electric charge of the activated carbon electrodes 50 and 51 serving as polarizable electrodes is transferred to the current collector 5.
The current is collected at 3, 54 and functions as a capacitor. Also, a plurality of the basic cells described above are connected to increase the capacitance and obtain a desired voltage (hereinafter, this technique is referred to as Conventional Example 1).

【0006】また、実開平5−62026号公報には、
板状に加圧成形された活性炭電極にその表面から裏面に
達するスリットを線状パターンに形成した電気二重層コ
ンデンサが開示されている(以下、この技術を従来例2
という)。
Further, Japanese Utility Model Laid-Open No. 5-62026 discloses that
There has been disclosed an electric double layer capacitor in which a slit extending from the front surface to the back surface is formed in a linear pattern in a plate-shaped pressure-formed activated carbon electrode (hereinafter, this technology is referred to as Conventional Example 2).
).

【0007】また、特開平6−7539号公報には、活
性炭粉末を焼結して集電体との接触面を有する電極体を
形成し、その電極体に電解液を含浸させ、電極体を接触
面に垂直に分割して複数個の小型焼結体に形成するとと
もに、その小型焼結体の相互間隙に活性体粉末と電解液
とによるペースト状の混練物を充填した電気二重層コン
デンサが開示されている(以下、この技術を従来例3と
いう)。
Japanese Patent Application Laid-Open No. 6-7539 discloses that an electrode body having a contact surface with a current collector is formed by sintering activated carbon powder, and the electrode body is impregnated with an electrolytic solution. An electric double-layer capacitor that is divided vertically into the contact surface and formed into a plurality of small sintered bodies, and the interstices between the small sintered bodies are filled with a paste-like kneaded material of an active material powder and an electrolytic solution. The technology is disclosed (hereinafter, this technology is referred to as Conventional Example 3).

【0008】さらに、特開平7−48464号公報に
は、電荷を集電する集電体を有し、電解液が含浸されて
分極性電極となる活性炭粉末の焼結体からなる多孔性の
電極体を、電解質を含浸させたセパレータを介して対峙
させ、集電体面上において、複数個の多孔性の小型分極
性電極をそれぞれ互いに非接触で分離して配置した電気
二重層コンデンサが開示されている(以下、この技術を
従来例4という)。
Further, Japanese Patent Application Laid-Open No. 7-48464 discloses a porous electrode having a current collector for collecting electric charges, and comprising a sintered body of activated carbon powder which is impregnated with an electrolyte and becomes a polarizable electrode. An electric double layer capacitor is disclosed in which a body is opposed to each other via a separator impregnated with an electrolyte, and a plurality of porous small polarizable electrodes are separately arranged in a non-contact manner on a current collector surface. (Hereinafter, this technique is referred to as Conventional Example 4).

【0009】[0009]

【発明が解決しようとする課題】従来例1では、基本セ
ルの活性炭電極を薄膜化した場合、電解液のドライアッ
プがしやすくなるため、製品性能に悪影響を及ぼし、電
気特性の信頼性を低下させる。また、活性炭電極に対す
る電解液量の割合が少ないので、初期特性も悪い。ま
た、多量の電解液を保持しようとすると、コンデンサ全
体が大型化してしまう。さらに、電圧印加時に活性炭電
極からCO2などのガスが発生するため、内圧上昇によ
る内部抵抗の増加や静電容量の低下を引き起こすという
問題がある。そのため、封入工程の前に電圧を印加して
予めガスを発生させておく必要があり、製造時間が長く
なる。
In the prior art 1, when the activated carbon electrode of the basic cell is thinned, it is easy to dry up the electrolyte, which adversely affects the product performance and lowers the reliability of the electrical characteristics. Let it. Further, since the ratio of the amount of the electrolyte to the activated carbon electrode is small, the initial characteristics are poor. Also, if an attempt is made to hold a large amount of electrolyte, the entire capacitor will be large. Furthermore, since a gas such as CO2 is generated from the activated carbon electrode when a voltage is applied, there is a problem that an increase in internal pressure causes an increase in internal resistance and a decrease in capacitance. Therefore, it is necessary to apply a voltage to generate gas in advance before the encapsulation step, and the production time becomes longer.

【0010】従来例2では、活性体電極にスリットを形
成し、そのスリットに電解液を十分しみこませて、所望
の静電容量を得る点については開示されているが、スリ
ット内にどの程度の量の電解液を保持するのかという点
については何ら開示されていない。
The prior art 2 discloses that a slit is formed in the activator electrode and the electrolyte is sufficiently impregnated into the slit to obtain a desired capacitance. No disclosure is made as to whether an amount of electrolyte is to be retained.

【0011】従来例3では、電極を小電極化することに
より外部応力を緩和し、小電極の間隙に充填したペース
トにより静電容量を増大させる点については開示されて
いるが、スリット内にどの程度の量の電解液を保持する
のかという点については何ら開示されていない。なお、
ペースト状電極の電解液比率を大にすると、小電極の電
解液の含浸が不要である旨記載されているが、小電極と
ペースト状電極の体積比率及び両電極の空孔率を勘案す
ると、浸透性の差により電解液が移動するだけでこの効
果を見込むのは困難である。
The prior art 3 discloses that the electrodes are reduced in size to relieve external stress and increase the capacitance by the paste filled in the gaps between the small electrodes. There is no disclosure as to whether a moderate amount of electrolyte is retained. In addition,
It is described that if the electrolyte ratio of the paste electrode is increased, it is not necessary to impregnate the electrolyte solution of the small electrode, but in view of the volume ratio of the small electrode and the paste electrode and the porosity of both electrodes, It is difficult to anticipate this effect only by the movement of the electrolyte due to the difference in permeability.

【0012】従来例4では、従来例3における小電極相
互の間隙に充填してあるペースト電極を除いた構造が開
示されているだけであり、スリット内にどの程度の量の
電解液を保持するのかという点については何ら開示され
ていない。
The prior art 4 only discloses a structure in which the paste electrode filled in the gap between the small electrodes in the conventional example 3 is removed, and how much amount of the electrolyte is held in the slit. Nothing is disclosed about this.

【0013】なお、従来例2〜4の電気二重層コンデン
サの電極の厚さは数ミリ〜数百ミリと考えられるが、本
願発明のように厚さが数十ミクロン〜数百ミクロンとい
う非常に薄膜の電極を用いる点についても何ら開示され
ていない。
The thickness of the electrodes of the electric double layer capacitors of the conventional examples 2 to 4 is considered to be several millimeters to several hundreds of millimeters. There is no disclosure of using a thin-film electrode.

【0014】本発明は、上記課題を解決するためになさ
れたものであり、電気特性の信頼性を向上させ、初期特
性を向上させ、内部抵抗の増加や静電容量の低下を防止
することができ、製造時間を短縮できる電気二重層コン
デンサ及びその製造方法を提供することを目的とする。
The present invention has been made to solve the above problems, and it is an object of the present invention to improve the reliability of electric characteristics, improve initial characteristics, and prevent an increase in internal resistance and a decrease in capacitance. It is an object of the present invention to provide an electric double layer capacitor capable of reducing the manufacturing time and a method for manufacturing the same.

【0015】[0015]

【課題を解決するための手段】本発明は、電解液を含浸
した一対の薄膜の活性炭電極と、前記活性炭電極の内面
の間に挟まれたセパレータと、前記活性炭電極の外面に
それぞれ設けられ、活性炭電極の電荷を集電する集電体
と、を有する電気二重層コンデンサにおいて、前記活性
炭電極に電解液を保持する電解液保持用溝が形成され、
前記電解液保持用溝は、使用時に想定されるドライアッ
プ分の量の電解液を保持できる容積を有する、ことを特
徴とするものである。
The present invention provides a pair of thin-film activated carbon electrodes impregnated with an electrolytic solution, a separator sandwiched between inner surfaces of the activated carbon electrodes, and an outer surface of the activated carbon electrodes, respectively. A current collector for collecting the charge of the activated carbon electrode, and an electric double layer capacitor having an electrolytic solution holding groove for holding an electrolyte in the activated carbon electrode,
The electrolyte retaining groove has a volume capable of retaining an amount of electrolyte expected to dry up when used.

【0016】前記活性炭電極は複数の電極体で構成さ
れ、前記電極体間の隙間によって前記電解液保持用溝が
形成されているのが好ましい。
It is preferable that the activated carbon electrode is composed of a plurality of electrode bodies, and the electrolytic solution holding groove is formed by a gap between the electrode bodies.

【0017】前記活性炭電極の厚さは、数十ミクロン〜
数百ミクロンであるのが好ましい。
The thickness of the activated carbon electrode is several tens of microns.
Preferably it is several hundred microns.

【0018】前記電解液保持用溝は、電圧印加時に前記
活性炭電極から発生するガスの逃げ場となるように形成
されているのが好ましい。
It is preferable that the electrolyte retaining groove is formed so as to serve as an escape for gas generated from the activated carbon electrode when a voltage is applied.

【0019】本発明の電気二重層コンデンサの製造方法
は、薄膜の活性炭電極を構成する複数の電極体を所定の
隙間をもって集電体の一方の面に設ける工程と、前記活
性炭電極に含浸される分の量に、使用時に想定されるド
ライアップ分の量を加えた電解液を、前記活性炭電極、
及び前記隙間によって形成される電解液保持用溝に注入
する工程と、セパレータを介して前記活性炭電極を内側
にして一対の集電体を貼り合わせる工程と、前記活性炭
電極、集電体及びセパレータの外周部を封止する工程
と、を有することを特徴とするものである。
According to the method of manufacturing an electric double layer capacitor of the present invention, a step of providing a plurality of electrode bodies constituting a thin-film activated carbon electrode on one surface of a current collector with a predetermined gap, and impregnating the activated carbon electrode The amount of the electrolyte solution added to the amount of the dry-up amount assumed at the time of use, the activated carbon electrode,
And a step of injecting into the electrolytic solution holding groove formed by the gap, a step of bonding a pair of current collectors with the activated carbon electrode inside through a separator, and a step of bonding the activated carbon electrode, the current collector and the separator. Sealing the outer peripheral portion.

【0020】前記活性炭電極の厚さは、数十ミクロン〜
数百ミクロンであるのが好ましい。
The activated carbon electrode has a thickness of several tens of microns.
Preferably it is several hundred microns.

【0021】本発明によれば、薄膜の活性炭電極に、使
用時に想定されるドライアップ分の電解液を保持できる
容積を有する電解液保持用溝を形成しているので、電解
液のドライアップにより製品性能に影響がでるのを防止
することができる。
According to the present invention, since the thin film activated carbon electrode is formed with the electrolyte holding groove having a volume capable of holding the electrolyte solution that is expected to be used at the time of use, the electrolyte can be dried up. It is possible to prevent the product performance from being affected.

【0022】[0022]

【発明の実施の形態】以下、本発明の実施の形態を図面
を参照しながら説明する。図1(A)は、本発明の実施
の形態に係る電気二重層コンデンサを示す断面図、
(B)は(A)のI−I線平面一部断面図である。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a sectional view showing an electric double layer capacitor according to an embodiment of the present invention,
(B) is a partial cross-sectional view taken along the line II in (A).

【0023】図1(A)及び(B)に示すように、本発
明の実施の形態に係る電気二重層コンデンサは、電解液
を含浸した第1及び第2の活性炭電極1、2と、第1及
び第2の活性炭電極1、2の内面の間に挟まれた多孔性
のセパレータ3と、第1及び第2の活性炭電極1、2の
外面にそれぞれ設けられ、活性炭電極1、2の電荷を集
電する第1及び第2の集電体4、5と、第1及び第2の
活性炭電極1、2、セパレータ3、第1及び第2の集電
体4、5の外周を取り囲むガスケット6と、を有し、活
性炭電極1.2には、電解液を保持する電解液保持用溝
7が形成されている。
As shown in FIGS. 1A and 1B, an electric double layer capacitor according to an embodiment of the present invention includes first and second activated carbon electrodes 1 and 2 impregnated with an electrolyte. The porous separator 3 sandwiched between the inner surfaces of the first and second activated carbon electrodes 1 and 2 and the outer surface of the first and second activated carbon electrodes 1 and 2 are provided respectively. First and second current collectors 4 and 5 for collecting current, and first and second activated carbon electrodes 1 and 2, separator 3 and gasket surrounding the outer periphery of first and second current collectors 4 and 5 6, and an electrolytic solution holding groove 7 for holding an electrolytic solution is formed in the activated carbon electrode 1.2.

【0024】活性炭電極1,2は、厚さ40〜100μ
m程度の薄膜状に形成されており、複数(図1では9
個)の小型の電極体1a,2aから構成されている。各
電極体1a,2aは、一辺が8mm程度の正方形の形状
に形成され、集電体1,2の内面に格子状に配置されて
いる。このように活性炭電極1,2を小電極化すること
により、外部応力を緩和することができる。
The activated carbon electrodes 1 and 2 have a thickness of 40 to 100 μm.
m and a plurality of thin films (9 in FIG. 1).
) Small electrode bodies 1a and 2a. Each of the electrode bodies 1a and 2a is formed in a square shape with a side of about 8 mm, and is arranged in a grid on the inner surfaces of the current collectors 1 and 2. By reducing the size of the activated carbon electrodes 1 and 2 as described above, external stress can be reduced.

【0025】電解液保持用溝7は、電極体1a,2a間
の隙間によって形成され、その幅は、0.3mm〜0.
5mm程度である。電解液保持用溝7は、使用時に想定
されるドライアップ分の電解液を保持できる容積を有す
るように、その溝数、幅の寸法などが決定される。ま
た、電解液保持用溝7は、電圧印加時に活性炭電極から
発生するCO2などのガスの逃げ場となるように形成さ
れている。
The electrolyte retaining groove 7 is formed by a gap between the electrode bodies 1a and 2a, and has a width of 0.3 mm to 0.2 mm.
It is about 5 mm. The number and width of the groove 7 are determined so that the electrolyte holding groove 7 has a volume capable of holding a dry-up amount of the electrolyte expected when used. Further, the electrolyte holding groove 7 is formed so as to serve as an escape for gas such as CO2 generated from the activated carbon electrode when a voltage is applied.

【0026】次に、本発明の電気二重層コンデンサの製
造方法を説明する。
Next, a method for manufacturing the electric double layer capacitor of the present invention will be described.

【0027】まず、活性炭、カ−ボン、バインダ−、可
塑剤などを一定の割合で混合、攪拌した後、スクリ−ン
成膜などの方法を用いて、集電体4,5に厚さ40〜1
00μm程度の薄膜状の活性炭電極1,2を形成する。
活性炭電極1,2を形成するときは、一辺が8mm程度
の正方形の形状の電極体1a,2aを、0.3〜0.5
mmの隙間を持って格子状に配置する。電極体1a,2
a間の隙間によって電解液保持用溝7が形成される。
First, activated carbon, carbon, a binder, a plasticizer and the like are mixed and stirred at a fixed ratio, and then the current collectors 4 and 5 are coated with a thickness of 40 by a method such as screen film formation. ~ 1
Activated carbon electrodes 1 and 2 in the form of a thin film of about 00 μm are formed.
When forming the activated carbon electrodes 1 and 2, the electrode bodies 1 a and 2 a having a square shape with a side of about 8 mm are connected to 0.3 to 0.5
They are arranged in a grid with a gap of mm. Electrode body 1a, 2
The gap 7a forms an electrolyte holding groove 7.

【0028】次いで、活性炭電極1,2を熱硬化させた
後、活性炭電極1,2の含浸量及び電解液保持用溝7の
容積に相当する量を合計した量の電解液をマイクロピペ
ットなどを用いて、活性炭電極1,2及び電解液保持用
溝7に注入する。
Next, after the activated carbon electrodes 1 and 2 are heat-cured, the amount of the electrolytic solution obtained by adding the amount of impregnation of the activated carbon electrodes 1 and 2 and the volume corresponding to the volume of the electrolyte retaining groove 7 is added to a micropipette or the like. Then, it is injected into the activated carbon electrodes 1 and 2 and the electrolyte retaining groove 7.

【0029】次いで、セパレ−タ3、ガスケット6、及
び対向する活性炭電極1,2及び電解液保持用溝7が形
成済みの集電体4,5を減圧下で貼り合わせる。
Next, the separator 3, the gasket 6, and the current collectors 4, 5 on which the opposed activated carbon electrodes 1, 2 and the electrolyte retaining groove 7 have been formed are bonded together under reduced pressure.

【0030】最後に、外周部を熱融着などの手段を用い
て封止すれば、本発明の電気二重層コンデンサが完成す
る。
Finally, if the outer peripheral portion is sealed by means such as heat fusion, the electric double layer capacitor of the present invention is completed.

【0031】本発明によれば、薄膜の活性炭電極1,2
に、使用時に想定されるドライアップ分の電解液を保持
できる容積を有する電解液保持用溝7を形成しているの
で、電解液のドライアップにより製品性能に影響がでる
のを防止することができ、電気特性の信頼性を向上させ
ることができ、かつ、活性炭電極1,2に対する電解液
量の割合が多くなり、初期特性を向上させることができ
る。
According to the present invention, the thin-film activated carbon electrodes 1 and 2
In addition, since the electrolyte holding groove 7 having a volume capable of holding the electrolyte for dry-up expected during use is formed, it is possible to prevent the product performance from being affected by the electrolyte dry-up. Thus, the reliability of the electric characteristics can be improved, and the ratio of the amount of the electrolyte to the activated carbon electrodes 1 and 2 can be increased, thereby improving the initial characteristics.

【0032】また、電解液保持用溝7は、電圧印加時に
活性炭電極1,2から発生するCO2などのガスの逃げ
場となるように形成されているので、内圧上昇による内
部抵抗の増加や静電容量の低下を防止することができ
る。特に、厚さが数十ミクロン〜数百ミクロンという非
常に薄膜の活性炭電極1,2を用いた場合には、薄膜の
ためにガス発生量は微少であり、電解液保持用溝7でも
ガスの逃げ場として十分に機能する。
Further, the electrolyte retaining groove 7 is used when the voltage is applied.
CO generated from activated carbon electrodes 1 and 2TwoEscape of gas as
Is formed so that the internal pressure rises
It is possible to prevent an increase in electrical resistance and a decrease in capacitance.
You. In particular, non-thicknesses of tens to hundreds of microns
When the thin-film activated carbon electrodes 1 and 2 are always used,
Therefore, the amount of gas generated is very small.
Works well as a gas escape.

【0033】さらに、電解液保持用溝7が発生ガスの逃
げ場として機能するので、封入工程の前に電圧を印加し
て予めガスを発生させておく必要がなくなり、製造時間
を短縮できる。
Further, since the electrolytic solution holding groove 7 functions as a refuge for the generated gas, it is not necessary to apply a voltage to generate the gas in advance before the encapsulation step, thereby shortening the manufacturing time.

【0034】本発明は、上記実施の形態に限定されるこ
とはなく、特許請求の範囲に記載された技術的事項の範
囲内において、種々の変更が可能である。
The present invention is not limited to the above embodiment, and various changes can be made within the scope of the technical matters described in the claims.

【0035】本発明の実施の形態では、正方形の電極体
1a,2aを格子状に9個配列しているが、前述したよ
うに、ドライアップ相当分の電解液が電解液保持用溝7
に保持できれば基本的にはどのような形状の活性炭電極
及び電解液保持用溝でもよい。例えば、図2(A)に示
すように、多角形の電極体8の隙間によって電解液保持
用溝7を形成したり、図2(B)に示すように、大きさ
の異なる同心の枠部9の隙間によって電解液保持用溝7
を形成してもよい。また、電解液保持用溝7は、活性炭
電極1,2の表面のみをスリット加工又はリンプル加工
して形成してもよい。
In the embodiment of the present invention, nine square electrode bodies 1a and 2a are arranged in a lattice pattern. However, as described above, the electrolyte corresponding to the dry-up is supplied to the electrolyte holding groove 7a.
Basically, any shape of activated carbon electrode and electrolyte solution holding groove may be used. For example, as shown in FIG. 2A, a groove 7 for holding an electrolyte is formed by a gap between polygonal electrode bodies 8, or as shown in FIG. 2B, concentric frame portions having different sizes. 9 for holding the electrolyte solution.
May be formed. Further, the electrolyte retaining groove 7 may be formed by slitting or rimpling only the surfaces of the activated carbon electrodes 1 and 2.

【0036】[0036]

【実施例】従来の電気二重層コンデンサにおいて、基本
セルの活性炭電極が薄膜である場合、電解液のドライア
ップを完全に防止することは非常に困難であり、図3に
おける従来の基本セルでは、例えば60℃、500時間
の高温放置において、約100μLの電解液が95μL
まで減少し、約5μL相当の電解液がドライアップする
ことが確認されている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS In a conventional electric double layer capacitor, when the activated carbon electrode of the basic cell is a thin film, it is very difficult to completely prevent the electrolyte solution from drying up. For example, at a high temperature of 60 ° C. for 500 hours, about 100 μL of the electrolytic solution is 95 μL.
It has been confirmed that the electrolyte solution of about 5 μL dries up.

【0037】また、上記ドライアップ量はESR(Equ
ivalent Series Resistance:等価直列抵抗)の変化率
と相関関係があり、したがって信頼性を確保するには想
定される電解液ドライアップ量をあらかじめセル内部に
余分に保持させておけばよいことになる。
The above dry-up amount is determined by the ESR (Equ
There is a correlation with the rate of change of equivalent series resistance (equivalent series resistance). Therefore, in order to ensure reliability, it is necessary to keep an assumed amount of electrolyte dry-up in the cell in advance.

【0038】本発明者が行った実験によれば、0.5m
m幅の電解液保持用溝7を4本付加することにより、約
4.9μLすなわち60℃、500時間の電解液ドライ
アップ量を保持できることがわかった。
According to an experiment conducted by the inventor, 0.5 m
It has been found that by adding four electrolyte solution holding grooves 7 having a width of m, it is possible to hold the electrolyte solution dry-up amount of about 4.9 μL, that is, 60 ° C. for 500 hours.

【0039】また、初期状態においては、活性炭電極
1,2量に対する電解液量が電解液保持用溝7の分だけ
多くなるため、活性炭電極1,2間のイオン伝導性が向
上しESRを低減する効果がある。
In the initial state, the amount of the electrolyte with respect to the activated carbon electrodes 1 and 2 is increased by the amount of the electrolyte retaining groove 7, so that the ionic conductivity between the activated carbon electrodes 1 and 2 is improved and the ESR is reduced. Has the effect of doing

【0040】本発明者は、本発明による電気二重層コン
デンサの基本セル(本発明品)と従来の電気二重層コン
デンサの基本セル(従来品)との電気特性の信頼性を評
価・比較する実験を行った。この実験では、温度60℃
で、0.8Vの電圧を印加して、初期時及び500時間
後の本発明品と従来品との抵抗値を測定した。
The present inventors conducted an experiment to evaluate and compare the reliability of the electrical characteristics of the basic cell of the electric double layer capacitor according to the present invention (the present invention) and the basic cell of the conventional electric double layer capacitor (the conventional product). Was done. In this experiment, the temperature was 60 ° C.
Then, a voltage of 0.8 V was applied, and resistance values of the product of the present invention and the conventional product at the initial stage and after 500 hours were measured.

【0041】[0041]

【表1】表1に示すように、本発明品は、従来品に比べESRの
劣化を抑制する効果があることがわかる。これは、前述
したように、60℃ 500時間の高温放置における電
解液のドライアップ量を電解液保持用溝7によりあらか
じめセル内部に保持していたためと考えられる。
[Table 1] As shown in Table 1, it can be seen that the product of the present invention has an effect of suppressing the deterioration of ESR as compared with the conventional product. This is presumably because, as described above, the dry-up amount of the electrolytic solution when left at a high temperature of 60 ° C. for 500 hours was previously held inside the cell by the electrolytic solution holding groove 7.

【0042】また、同様の理由により、活性炭電極1,
2が含有できる電解液量以上にセル内部に電解液を保持
できるため、活性炭電極1,2間のイオン伝導性が向上
し、初期ESRにおいても低減の効果が現れている。
For the same reason, the activated carbon electrode 1,
Since the electrolytic solution can be held in the cell more than the amount of the electrolytic solution that can contain 2, the ionic conductivity between the activated carbon electrodes 1 and 2 is improved, and the effect of reducing the initial ESR also appears.

【0043】上記効果とは別に活性炭電極1,2を細分
化して成膜するため、膜厚がスキ−ジの印圧や成膜機の
機械精度による影響が受けにくくなり、膜厚精度が向上
する。その結果、表2に示すように、静電容量のバラツ
キも低減する。
In addition to the above-mentioned effects, the activated carbon electrodes 1 and 2 are subdivided to form a film, so that the film thickness is less affected by the printing pressure of the squeegee and the mechanical accuracy of the film forming machine, and the film thickness accuracy is improved. I do. As a result, as shown in Table 2, variation in capacitance is also reduced.

【0044】[0044]

【表2】本発明は、上記実施例に限定されることはなく、特許請
求の範囲に記載された技術的事項の範囲内において、種
々の変更が可能である。
[Table 2] The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the technical matters described in the claims.

【0045】[0045]

【発明の効果】本発明によれば、薄膜の活性炭電極に、
使用時に想定されるドライアップ分の電解液を保持でき
る容積を有する電解液保持用溝を形成しているので、電
解液のドライアップにより製品性能に影響がでるのを防
止することができ、電気特性の信頼性を向上させること
ができ、かつ、活性炭電極に対する電解液量の割合が多
くなり、初期特性を向上させることができる。
According to the present invention, a thin-film activated carbon electrode
Since the electrolyte holding groove has a volume that can hold the electrolyte solution for the dry-up expected during use, it is possible to prevent the dry-up of the electrolyte from affecting the product performance, The reliability of the characteristics can be improved, and the ratio of the amount of the electrolyte solution to the activated carbon electrode increases, so that the initial characteristics can be improved.

【0046】また、電解液保持用溝は、電圧印加時に活
性炭電極から発生するCO2などのガスの逃げ場となる
ように形成されているので、内圧上昇による内部抵抗の
増加や静電容量の低下を防止することができる。特に、
厚さが数十ミクロン〜数百ミクロンという非常に薄膜の
活性炭電極を用いた場合には、薄膜のためにガス発生量
は微少であり、電解液保持用溝でもガスの逃げ場として
十分に機能する。
Further, since the electrolyte retaining groove is formed so as to escape gas such as CO2 generated from the activated carbon electrode when a voltage is applied, the internal resistance increases and the capacitance decreases due to an increase in internal pressure. Can be prevented. In particular,
When a very thin activated carbon electrode with a thickness of several tens of microns to several hundreds of microns is used, the amount of gas generated is very small because of the thin film, and the groove for holding the electrolyte can function sufficiently as a gas escape space. .

【0047】さらに、電解液保持用溝が発生ガスの逃げ
場として機能するので、封入工程の前に電圧を印加して
予めガスを発生させておく必要がなくなり、製造時間を
短縮できる。
Further, since the electrolyte retaining groove functions as an escape for the generated gas, it is not necessary to apply a voltage before the encapsulation step to generate the gas in advance, thereby shortening the manufacturing time.

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

【図1】(A)は、本発明の実施の形態に係る電気二重
層コンデンサを示す断面図、(B)は(A)のI−I線平
面一部断面図である。
FIG. 1A is a cross-sectional view showing an electric double layer capacitor according to an embodiment of the present invention, and FIG. 1B is a partial cross-sectional view taken along a line II in FIG.

【図2】(A)及び(B)は、本発明の他の実施の形態
に係る電気二重層コンデンサを示す平面一部断面図であ
る。
FIGS. 2A and 2B are plan partial cross-sectional views showing an electric double layer capacitor according to another embodiment of the present invention.

【図3】(A)は、従来の電気二重層コンデンサを示す
断面図、(B)は(A)のIII−III線平面一部断面図で
ある。
FIG. 3A is a cross-sectional view showing a conventional electric double layer capacitor, and FIG. 3B is a partial cross-sectional view taken along the line III-III of FIG.

【符号の説明】[Explanation of symbols]

1,2:第1及び第2の活性炭電極1a、2a:電極体 3:セパレータ 4,5:第1及び第2の集電体 6:ガスケット 7:電解液保持用溝 8:電極体 9:枠部 1, 2: first and second activated carbon electrodes 1a, 2a: electrode body 3: separator 4, 5: first and second current collectors 6: gasket 7: electrolyte retaining groove 8: electrode body 9: Frame

Claims (6)

Translated fromJapanese
【特許請求の範囲】[Claims]【請求項1】電解液を含浸した一対の薄膜の活性炭電極
と、前記活性炭電極の内面の間に挟まれたセパレータ
と、前記活性炭電極の外面にそれぞれ設けられ、活性炭
電極の電荷を集電する集電体と、を有する電気二重層コ
ンデンサにおいて、 前記活性炭電極に電解液を保持する電解液保持用溝が形
成され、前記電解液保持用溝は、使用時に想定されるド
ライアップ分の量の電解液を保持できる容積を有する、
ことを特徴とする電気二重層コンデンサ。
1. A pair of thin-film activated carbon electrodes impregnated with an electrolyte, a separator sandwiched between inner surfaces of the activated carbon electrodes, and an outer surface of the activated carbon electrodes, respectively, for collecting electric charges of the activated carbon electrodes. And a current collector, comprising: an electrolytic solution holding groove for holding an electrolytic solution in the activated carbon electrode, wherein the electrolytic solution holding groove has a dry-up amount assumed during use. Having a volume that can hold the electrolyte solution,
An electric double-layer capacitor characterized by the above-mentioned.
【請求項2】前記活性炭電極は複数の電極体で構成さ
れ、前記電極体間の隙間によって前記電解液保持用溝が
形成されていることを特徴とする請求項1に記載の電気
二重層コンデンサ。
2. The electric double layer capacitor according to claim 1, wherein said activated carbon electrode is constituted by a plurality of electrode bodies, and said electrolyte retaining groove is formed by a gap between said electrode bodies. .
【請求項3】前記活性炭電極の厚さは、数十ミクロン〜
数百ミクロンであることを特徴とする請求項1又は2に
記載の電気二重層コンデンサ。
3. The activated carbon electrode has a thickness of several tens of microns.
3. The electric double-layer capacitor according to claim 1, wherein the electric double-layer capacitor has a thickness of several hundred microns.
【請求項4】前記電解液保持用溝は、電圧印加時に前記
活性炭電極から発生するガスの逃げ場となるように形成
されていることを特徴とする請求項1乃至3のいずれか
1つの項に記載の電気二重層コンデンサ。
4. The method according to claim 1, wherein the electrolyte retaining groove is formed so as to serve as an escape for gas generated from the activated carbon electrode when a voltage is applied. The electric double-layer capacitor as described.
【請求項5】薄膜の活性炭電極を構成する複数の電極体
を所定の隙間をもって集電体の一方の面に設ける工程
と、 前記活性炭電極に含浸される分の量に、使用時に想定さ
れるドライアップ分の量を加えた電解液を、前記活性炭
電極、及び前記隙間によって形成される電解液保持用溝
に注入する工程と、 セパレータを介して前記活性炭電極を内側にして一対の
集電体を貼り合わせる工程と、 前記活性炭電極、集電体及びセパレータの外周部を封止
する工程と、 を有することを特徴とする電気二重層コンデンサの製造
方法。
5. A step of providing a plurality of electrode bodies constituting a thin-film activated carbon electrode on one surface of a current collector with a predetermined gap, and an amount impregnated in the activated carbon electrode when used. A step of injecting the electrolyte added with the amount of the dry-up into the activated carbon electrode and the electrolyte retaining groove formed by the gap; and a pair of current collectors with the activated carbon electrode inside through a separator. And a step of sealing the outer periphery of the activated carbon electrode, the current collector, and the separator.
【請求項6】前記活性炭電極の厚さは、数十ミクロン〜
数百ミクロンであることを特徴とする請求項5に記載の
電気二重層コンデンサの製造方法。
6. The activated carbon electrode has a thickness of several tens of microns.
The method for manufacturing an electric double layer capacitor according to claim 5, wherein the thickness is several hundred microns.
JP21446999A1999-07-291999-07-29Electric double-layer capacitor and manufacture thereofPendingJP2001044081A (en)

Priority Applications (1)

Application NumberPriority DateFiling DateTitle
JP21446999AJP2001044081A (en)1999-07-291999-07-29Electric double-layer capacitor and manufacture thereof

Applications Claiming Priority (1)

Application NumberPriority DateFiling DateTitle
JP21446999AJP2001044081A (en)1999-07-291999-07-29Electric double-layer capacitor and manufacture thereof

Publications (1)

Publication NumberPublication Date
JP2001044081Atrue JP2001044081A (en)2001-02-16

Family

ID=16656250

Family Applications (1)

Application NumberTitlePriority DateFiling Date
JP21446999APendingJP2001044081A (en)1999-07-291999-07-29Electric double-layer capacitor and manufacture thereof

Country Status (1)

CountryLink
JP (1)JP2001044081A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication numberPriority datePublication dateAssigneeTitle
EP1411533A1 (en)*2002-10-092004-04-21Asahi Glass Company, LimitedElectric double layer capacitor and process for its production

Cited By (2)

* Cited by examiner, † Cited by third party
Publication numberPriority datePublication dateAssigneeTitle
EP1411533A1 (en)*2002-10-092004-04-21Asahi Glass Company, LimitedElectric double layer capacitor and process for its production
US6906911B2 (en)2002-10-092005-06-14Asahi Glass Company, LimitedElectric double layer capacitor and process for its production

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