JPH0513271A - Electric double layer capacitor - Google Patents
Electric double layer capacitorInfo
- Publication number
- JPH0513271A JPH0513271A JP18523191A JP18523191A JPH0513271A JP H0513271 A JPH0513271 A JP H0513271A JP 18523191 A JP18523191 A JP 18523191A JP 18523191 A JP18523191 A JP 18523191A JP H0513271 A JPH0513271 A JP H0513271A
- Authority
- JP
- Japan
- Prior art keywords
- electric double
- double layer
- layer capacitor
- embossing
- capacitor
- 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
- Y02E60/13—Energy storage using capacitors
Landscapes
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は電気二重層コンデンサに
関し、特に電気二重層コンデンサの外装構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric double layer capacitor, and more particularly to an exterior structure for an electric double layer capacitor.
【0002】[0002]
【従来の技術】従来の電気二重層コンデンサの構造を図
3に示す。同図において、(a)は側面図、(b)はそ
のD−D線断面図である。この電気二重層コンデンサ
は、電荷保持機能を有する電気二重層コンデンサ素子
(以下、素子と称する)1と、その両側に配された一対
のリード付電極板20a,20bとで構成される。素子
1は図4に断面構造を示す様に複数個の基本セル2を積
層している。この基本セル2は円筒形の絶縁性ゴム3を
多孔性セパレータ4で上下に仕切り、この絶縁性ゴム3
の内部の空間に粉末活性炭と稀硫酸を混練して作った活
性炭ペースト電極5を充填し、更にその上下を導電性プ
ラスチックフィルム6で封止している。なお、多孔性セ
パレータ4は、イオン透過性で且つ非電子伝導性のもの
である。このようにして得た基本セル2の耐電圧は、稀
硫酸の電気分解電圧によって決まり、約1.2Vと低いの
で使用電圧に応じて必要枚数を積層して素子1を構成す
る。2. Description of the Related Art The structure of a conventional electric double layer capacitor is shown in FIG. In the same figure, (a) is a side view and (b) is a DD line sectional view thereof. This electric double layer capacitor is composed of an electric double layer capacitor element (hereinafter referred to as an element) 1 having a charge holding function, and a pair of leaded electrode plates 20a and 20b arranged on both sides thereof. The element 1 is formed by stacking a plurality of basic cells 2 as shown in the sectional structure of FIG. In this basic cell 2, a cylindrical insulating rubber 3 is divided into upper and lower parts by a porous separator 4, and the insulating rubber 3
The space inside is filled with an activated carbon paste electrode 5 made by kneading powdered activated carbon and dilute sulfuric acid, and the upper and lower sides thereof are sealed with a conductive plastic film 6. The porous separator 4 is ion-permeable and non-electroconductive. The withstand voltage of the basic cell 2 thus obtained is determined by the electrolysis voltage of dilute sulfuric acid and is as low as about 1.2 V. Therefore, the required number of layers is laminated according to the operating voltage to form the element 1.
【0003】このような電気二重層コンデンサの素子に
おいては、基本セル2内部の活性炭粒子間の接触抵抗
や、積層構造を採るために生ずる基本セル2相互間の接
触抵抗などからなる内部抵抗が存在する。この内部抵抗
の大きさは、図5に一例を示す様に素子1の上下から加
えられる圧力が大きいと小さくなるという特性を持つの
で電気二重層コンデンサ全体としての内部抵抗を小さく
抑え維持するためには、素子1に相当の圧力を加える必
要がある。この圧力の大きさは、内部抵抗の大きさや素
子の耐圧力性などを考慮して決めるが通常は数10kg/cm2
程度である。In the element of such an electric double layer capacitor, there is an internal resistance such as a contact resistance between the activated carbon particles inside the basic cell 2 and a contact resistance between the basic cells 2 caused by adopting the laminated structure. To do. The magnitude of this internal resistance has a characteristic that it decreases as the pressure applied from above and below the element 1 increases, as shown in an example in FIG. 5, so in order to keep the internal resistance of the electric double layer capacitor as a whole small and maintain it. Needs to apply a considerable pressure to the element 1. The magnitude of this pressure is determined in consideration of the magnitude of internal resistance and pressure resistance of the element, but normally it is several tens of kg / cm 2
It is a degree.
【0004】このため、素子1に必要な圧力の条件を維
持し、かつコンデンサとして動作させるために、図3に
示したように、素子1の両側にリード付電極板20a,
20bを配置し、これらをモールド金型の中に入れ、加
圧ピンにより各電極板20a,20bの外側から素子1
に圧力を印加した状態でモールド成形してモールド樹脂
7を成形させた構造がとられている。尚、加圧ピン穴8
は樹脂7が固まった後に加圧ピンを抜くために生じる穴
である。Therefore, in order to maintain the pressure condition necessary for the element 1 and to operate as a capacitor, as shown in FIG.
20b are arranged, these are put in a molding die, and the element 1 is applied from the outside of each electrode plate 20a, 20b by a pressing pin.
The mold resin 7 is molded by molding under pressure. In addition, pressure pin hole 8
Is a hole formed for removing the pressure pin after the resin 7 hardens.
【0005】ここで、前記リード付電極板20a,20
bは、素子1の外径より小さい径のエンボス21が施し
てある。これは、前記した素子1においては、素子1の
中心部分に充填した活性炭ペースト電極5が剛体に近い
固さを有しているため、リード付電極板20a,20b
で素子1を両側から押圧すると、活性炭ペースト電極5
部分で圧力が支えられてしまい、周辺部分の絶縁ゴム3
へ充分に圧力が印加され難くなる。この結果、絶縁性ゴ
ム3と導電性プラスチックフィルム6の接着面の接着が
不十分となり、或いは絶縁性ゴム3の組織に微欠陥や弱
い部分が存在した場合には各種寿命試験などで容易に活
性炭ペースト電極5の水分が抜け出して電気二重層コン
デンサの機能を低下させ、或いはコンデンサの内部抵抗
が異常に高くなると言う所謂ドライアップ現象により信
頼性を低下させてしまうおそれが生じる。この対策とし
て、リード付電極板20a,20bにエンボス21を施
すことで、絶縁性ゴム3と導電性プラスチックフィルム
6に対して効果的に圧力を印加することが可能となる。
これは実願平 2-89257号に開示されている。Here, the leaded electrode plates 20a, 20
An embossment 21 having a diameter smaller than the outer diameter of the element 1 is applied to b. This is because in the element 1 described above, the activated carbon paste electrode 5 filled in the central portion of the element 1 has a hardness close to that of a rigid body, and therefore the leaded electrode plates 20a, 20b.
When pressing the element 1 from both sides with, activated carbon paste electrode 5
Since the pressure is supported by the part, the insulating rubber 3 around
It becomes difficult to apply sufficient pressure to the. As a result, when the insulating rubber 3 and the conductive plastic film 6 are not sufficiently adhered to each other, or when the insulating rubber 3 has fine defects or weak portions, the activated carbon can be easily subjected to various life tests. There is a possibility that reliability may be deteriorated due to a so-called dry-up phenomenon in which moisture of the paste electrode 5 escapes and the function of the electric double layer capacitor is deteriorated, or the internal resistance of the capacitor is abnormally increased. As a countermeasure against this, by applying the embossing 21 to the leaded electrode plates 20a and 20b, it becomes possible to effectively apply pressure to the insulating rubber 3 and the conductive plastic film 6.
This is disclosed in Japanese Utility Model Application No. 2-89257.
【0006】[0006]
【発明が解決しようとする課題】この従来の電気二重層
コンデンサでは、リード付電極板20a,20bに設け
たエンボス21は素子1の外側に若干凹設したのに過ぎ
ず、しかもその他の面は平面状態に形成されているた
め、コンデンサをモールド成形する際に、図3に示すよ
うにリード付電極板20a,20bと素子1との間に半
径方向のずれが生じ易くなる。このように両者の間にず
れが生じると、エンボス21の凹凸の段部に絶縁ゴム3
が当接されてしまい、圧力が効果的にかからなくなり信
頼性が低下されるという問題が生じる。また、ずれ量が
大きい場合はモールド成形の際に、素子1の一部が樹脂
7から露出し、或いは孔状のボイドが生じて外観不良が
生じるという問題もある。本発明の目的は、リード付電
極板と素子との位置ずれを防止し、信頼性を改善し、か
つ外観を改善した電気二重層コンデンサを提供すること
にある。In this conventional electric double layer capacitor, the embossments 21 provided on the leaded electrode plates 20a and 20b are merely slightly recessed on the outside of the element 1, and the other surfaces are not provided. Since it is formed in a flat state, when the capacitor is molded, a radial deviation easily occurs between the leaded electrode plates 20a and 20b and the element 1 as shown in FIG. If there is a gap between the two in this way, the insulating rubber 3
Are abutted against each other, pressure is not effectively applied, and reliability deteriorates. In addition, when the amount of deviation is large, there is a problem that part of the element 1 is exposed from the resin 7 or a void in the shape of a hole is generated during molding, resulting in poor appearance. An object of the present invention is to provide an electric double layer capacitor in which positional deviation between an electrode plate with leads and an element is prevented, reliability is improved, and appearance is improved.
【0007】[0007]
【課題を解決するための手段】本発明の電気二重層コン
デンサは、少なくとも一方のリード付電極板に素子の外
形よりも若干大きなエンボスを形成し、このエンボスに
より素子とリード付電極板の位置決めを行うように構成
する。又、エンボスとしてリード付電極板の周縁に形成
される段差は、素子を構成する基本セルの厚さよりも小
さい寸法とし、かつテーパ状に形成することが好まし
い。In the electric double layer capacitor of the present invention, at least one of the leaded electrode plates is formed with an emboss which is slightly larger than the outer shape of the device, and this embossing positions the device and the leaded electrode plate. Configure to do. Further, it is preferable that the step formed on the periphery of the electrode plate with lead as an emboss has a size smaller than the thickness of the basic cell forming the element and is formed in a tapered shape.
【0008】[0008]
【作用】本発明によれば、エンボスによって素子とリー
ド付電極板との位置ずれが防止され、素子に対して好適
に圧力を印加して信頼性を改善させ、かつ位置ずれが原
因とされる外観不良を防止する。According to the present invention, the embossing prevents the displacement of the element and the leaded electrode plate, the pressure is suitably applied to the element to improve the reliability, and the displacement is the cause. Prevents appearance defects.
【0009】[0009]
【実施例】次に、本発明について図面を参照して説明す
る。図1は本発明のコンデンサを示し、(a)は正面
図、(b)はA−A線断面図である。又、図2はそのリ
ード付電極板を示し、(a)は正面図、(b)及び
(c)はそのB−B線、C−C線断面図である。図1に
おいて、コンデンサは素子1と、一対のリード付電極板
10(10a,10b)で構成され、これらリード付電
極板10により素子1は所要の圧力で挟持されるととも
に、モールド樹脂7で一体に成形される。尚、素子1は
図5に示した従来の電気二重層コンデンサ素子1と同じ
構造である。又、8は加圧ピン穴である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 shows a capacitor of the present invention, (a) is a front view, and (b) is a sectional view taken along the line AA. 2 shows the electrode plate with leads, (a) is a front view, and (b) and (c) are cross-sectional views taken along the line BB and CC. In FIG. 1, the capacitor is composed of an element 1 and a pair of leaded electrode plates 10 (10a, 10b). The leaded electrode plate 10 sandwiches the element 1 at a required pressure and is integrated with a molding resin 7. Is molded into. The element 1 has the same structure as the conventional electric double layer capacitor element 1 shown in FIG. Reference numeral 8 is a pressure pin hole.
【0010】前記リード付電極板10は、図2に示すよ
うに、中心部に素子1の外径よりも小径の第1のエンボ
ス11を形成するとともに、その外側には第1のエンボ
ス11と同心で素子1の外径より少し大きい第2のエン
ボス12を形成している。この第2のエンボス12を構
成するために周縁部に形成される段差13は、素子1が
圧力で縮んだ状態での基本セル2の厚みより小さくし、
かつテーパー状に形成している。即ち、基本セル2を積
層している素子1の側面には各基本セル2の導電性プラ
スチックフィルム6が出ており、第2のエンボス12の
段差13が基本セル2の圧縮時の厚みより大きい場合
は、基本セル2の導電性プラスチックフィルム6が接触
し、接触した基本セル2はショート状態となってコンデ
ンサとして機能せず見かけ上積層枚数を減らす結果とな
ってしまうため、このようなショートが起こらないよう
に段差13を設計している。又、素子1が圧縮された時
に素子外径が大きくなる方向に変化するので、その際の
接触回避のために段差13をテーパー状にしている。As shown in FIG. 2, the leaded electrode plate 10 has a first embossment 11 having a diameter smaller than the outer diameter of the element 1 at the center thereof, and a first embossment 11 on the outside thereof. The second embossing 12 is concentrically formed and is slightly larger than the outer diameter of the element 1. The step 13 formed on the peripheral edge portion to form the second emboss 12 is made smaller than the thickness of the basic cell 2 when the element 1 is compressed by pressure,
Moreover, it is formed in a tapered shape. That is, the conductive plastic film 6 of each basic cell 2 is exposed on the side surface of the element 1 in which the basic cells 2 are laminated, and the step 13 of the second emboss 12 is larger than the thickness of the basic cell 2 when compressed. In this case, the conductive plastic film 6 of the basic cell 2 comes into contact with each other, and the contacted basic cell 2 is in a short-circuited state and does not function as a capacitor, resulting in an apparent reduction in the number of laminated layers. The step 13 is designed so as not to occur. Further, when the element 1 is compressed, the outer diameter of the element changes so as to increase, so that the step 13 is tapered to avoid contact at that time.
【0011】この構成のリード付電極板を用いてコンデ
ンサをモールド成形する際には、従来と同様に、一方の
リード付電極板10aの上に素子1を載せ、更にその上
に他方リード付電極板10bを被せたものをモールド金
型にセットしているが、このとき、一方のリード付電極
板10aに設けられた第2のエンボス12によって素子
1の位置ずれは第2のエンボス12内に納められ、更に
素子1に対する他方のリード付電極板10bの位置ずれ
も第2のエンボス12内に納められる。したがって、各
リード付電極板10a,10bと素子1との位置ずれが
確実に防止でき、両者の位置ずれが原因とされていた信
頼性の低下を改善し、かつ素子の露出は樹脂回り不足に
よるボイドの発生を防止して外観不良を改善することが
可能となる。因に、従来のコンデンサにおける不良製品
の発生率は3%程度であったが、本発明により0%とす
ることができた。When a capacitor is molded using the electrode plate with leads having this structure, the element 1 is placed on one of the electrode plates with lead 10a, and the electrode with the other lead is placed thereon, as in the conventional case. The one covered with the plate 10b is set in a molding die, and at this time, the second emboss 12 provided on one of the leaded electrode plates 10a prevents the element 1 from being displaced within the second emboss 12. Further, the positional deviation of the other leaded electrode plate 10 b with respect to the element 1 is also stored in the second emboss 12. Therefore, the positional deviation between the leaded electrode plates 10a and 10b and the element 1 can be surely prevented, the decrease in reliability, which has been caused by the positional deviation between the two, is improved, and the element is exposed due to insufficient resin around. It is possible to prevent the occurrence of voids and improve the appearance defect. Incidentally, the generation rate of defective products in the conventional capacitor was about 3%, but could be set to 0% by the present invention.
【0012】ここで、本実施例においては、一方のリー
ド付電極板10aに素子1を載せ、この上に他方リード
付電極板10bを被せると言うアセンブリ操作をモール
ド金型外で実施しているために、両方のリード付電極板
に夫々第2のエンボス12を設けているが、モールド金
型内でアセンブリを行う際には、上側のリード付電極板
10bを被せる際の位置ずれは少ないため、下側のリー
ド付電極板10aにのみ本発明による第2のエンボス1
2を設けるようにしてもよい。尚、本発明では素子1が
円柱状であることから、第1及び第2のエンボス11,
12円形としたが素子形状によっては四角形その他の形
状に変えても本発明の効果が及ぶことは勿論である。Here, in this embodiment, the assembly operation of placing the element 1 on one of the leaded electrode plates 10a and covering the other leaded electrode plate 10b on the other is performed outside the molding die. For this reason, the second embossing 12 is provided on both of the leaded electrode plates. However, when assembling in the molding die, there is little displacement when the upper leaded electrode plate 10b is covered. , The second embossing 1 according to the present invention only on the lower electrode plate 10a with leads.
Two may be provided. In the present invention, since the element 1 has a cylindrical shape, the first and second embossments 11,
Although the shape is 12 circles, it goes without saying that the effect of the present invention can be achieved by changing the shape of the element to a quadrangle or another shape depending on the shape of the element.
【0013】[0013]
【発明の効果】以上説明したように本発明は、リード付
電極板に素子外径より少し大きめで素子の位置決めを行
う第2のエンボスを設けているので、リード付電極板と
素子との位置ずれを無くすことができる。これにより、
素子の絶縁性ゴムを効果的に加圧してコンデンサの信頼
性を改善するとともに、素子露出や樹脂回り不足等によ
る外観不良を防止することができる効果がある。As described above, according to the present invention, the electrode plate with lead is provided with the second embossing for positioning the device slightly larger than the outer diameter of the device. The gap can be eliminated. This allows
The insulating rubber of the element is effectively pressed to improve the reliability of the capacitor, and at the same time, it is possible to prevent the defective appearance due to the element exposure or insufficient resin around.
【図1】本発明の電気二重層コンデンサの一実施例を示
し、(a)は正面図、(b)はそのA−A線断面図であ
る。FIG. 1 shows an embodiment of an electric double layer capacitor of the present invention, (a) is a front view and (b) is a sectional view taken along the line AA.
【図2】図1のコンデンサで使用するリード付電極板を
示し、(a)は正面図、(b)はそのB−B線断面図、
(c)はそのC−C線断面図である。2 shows an electrode plate with leads used in the capacitor of FIG. 1, (a) is a front view, (b) is a sectional view taken along line BB thereof, FIG.
(C) is the CC sectional view taken on the line.
【図3】従来の電気二重コンデンサを示し、(a)は正
面図、(b)はそのD−D線断面図である。3A and 3B show a conventional electric double capacitor, in which FIG. 3A is a front view and FIG.
【図4】素子の内部構造を示す一部の断面図である。FIG. 4 is a partial cross-sectional view showing the internal structure of the element.
【図5】素子の内部抵抗の圧力依存性を示す図である。FIG. 5 is a diagram showing pressure dependence of internal resistance of an element.
1 素子 2 基本セル 3 絶縁性ゴム 4 多孔性セパレータ 5 活性炭ペースト電極 6 導電性プラスチックフィルム 7 モールド樹脂 10(10a,10b) リード付電極板 11 第1のエンボス 12 第2のエンボス 13 段差 1 element 2 basic cells 3 Insulating rubber 4 Porous separator 5 Activated carbon paste electrode 6 Conductive plastic film 7 Mold resin 10 (10a, 10b) Leaded electrode plate 11 First Emboss 12 Second Emboss 13 steps
Claims (2)
ド付電極板により所定の圧力で挟持させ、かつこれらを
樹脂成形した電気二重層コンデンサにおいて、少なくと
も一方のリード付電極板に電気二重層コンデンサ素子の
外形よりも若干大きなエンボスを形成し、このエンボス
により前記電気二重層コンデンサ素子とリード付電極板
の位置決めを行うように構成したことを特徴とする電気
二重層コンデンサ。1. An electric double layer capacitor in which an electric double layer capacitor element is sandwiched between a pair of electrode plates with leads at a predetermined pressure, and these are resin-molded. At least one electrode plate with leads has an electric double layer capacitor element. An electric double layer capacitor having an embossing slightly larger than the outer shape of the electric double layer capacitor and positioning the electric double layer capacitor element and the electrode plate with lead by this embossing.
縁に形成される段差は、電気二重層コンデンサ素子を構
成する基本セルの厚さよりも小さい寸法とし、かつテー
パ状に形成してなる請求項1の電気二重層コンデンサ。2. The step formed on the periphery of the leaded electrode plate forming the emboss has a size smaller than the thickness of the basic cell forming the electric double layer capacitor element, and is formed in a tapered shape. 1. Electric double layer capacitor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3185231A JP2674904B2 (en) | 1991-06-29 | 1991-06-29 | Electric double layer capacitor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3185231A JP2674904B2 (en) | 1991-06-29 | 1991-06-29 | Electric double layer capacitor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0513271A true JPH0513271A (en) | 1993-01-22 |
JP2674904B2 JP2674904B2 (en) | 1997-11-12 |
Family
ID=16167174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3185231A Expired - Lifetime JP2674904B2 (en) | 1991-06-29 | 1991-06-29 | Electric double layer capacitor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2674904B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006286804A (en) * | 2005-03-31 | 2006-10-19 | Nec Tokin Corp | Lead terminal for electric double layer capacitor |
JP2006324333A (en) * | 2005-05-17 | 2006-11-30 | Honda Motor Co Ltd | Electrochemical element |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59154013A (en) * | 1983-02-22 | 1984-09-03 | 日本電気株式会社 | Electric double layer condenser and method of producing same |
JPS59193298A (en) * | 1983-04-07 | 1984-11-01 | ヘキスト・アクチエンゲゼルシヤフト | Manufacture of plate-like, sheet-like or strip-like materialfrom aluminum or aluminum alloy |
-
1991
- 1991-06-29 JP JP3185231A patent/JP2674904B2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59154013A (en) * | 1983-02-22 | 1984-09-03 | 日本電気株式会社 | Electric double layer condenser and method of producing same |
JPS59193298A (en) * | 1983-04-07 | 1984-11-01 | ヘキスト・アクチエンゲゼルシヤフト | Manufacture of plate-like, sheet-like or strip-like materialfrom aluminum or aluminum alloy |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006286804A (en) * | 2005-03-31 | 2006-10-19 | Nec Tokin Corp | Lead terminal for electric double layer capacitor |
JP4602142B2 (en) * | 2005-03-31 | 2010-12-22 | Necトーキン株式会社 | Lead terminal for electric double layer capacitor |
JP2006324333A (en) * | 2005-05-17 | 2006-11-30 | Honda Motor Co Ltd | Electrochemical element |
JP4658683B2 (en) * | 2005-05-17 | 2011-03-23 | 本田技研工業株式会社 | Electrochemical element |
Also Published As
Publication number | Publication date |
---|---|
JP2674904B2 (en) | 1997-11-12 |
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