JP3998428B2

JP3998428B2 - Electric double layer capacitor

Info

Publication number: JP3998428B2
Application number: JP2001090044A
Authority: JP
Inventors: 英雄小野; 修一荒木
Original assignee: UD Trucks Corp
Current assignee: UD Trucks Corp
Priority date: 2001-03-27
Filing date: 2001-03-27
Publication date: 2007-10-24
Anticipated expiration: 2021-03-27
Also published as: JP2002289488A

Abstract

PROBLEM TO BE SOLVED: To ensure good assembling workability and good productivity. SOLUTION: A long cell sheet base 10 is composed of polarizable electrodes 13, 14 laminated both sides of a separator 12, and collector electrodes 15, 16 laminated on the outer sides of the polarizable electrodes 13, 14. The sheet base 10 is alternately folded in different directions every specified length to form a laminate cell 17. One collector 20 is made to contact with the collector electrode 15 on the outer layer of each folded part 18 at one end of the laminate cell 17, and another collector 21 is made to contact with the collector electrode 16 on the outer layer of each folded part 18 at the other end of the cell 17, thus conductively connecting the electrodes to the collectors.

Description

【０００１】
【発明の属する技術分野】
この発明は、電気二重層キャパシタ（電気二重層コンデンサ）に関する。
【０００２】
【従来の技術】
近年、各種の蓄電装置（電動自動車の駆動電源等）として、急速充電が可能で充放電サイクル寿命が長い、電気二重層キャパシタの適用技術が注目される。
【０００３】
電気二重層キャパシタとして、セパレータ、分極性電極、集電極、分極性電極、セパレータからなる一組の構造部品を、一定数積み重ねてセルを構成するものがある。
【０００４】
また、長尺のセパレータを所定長毎に異なる方向に交互に折り返して、それぞれの間に電極板を挟み込み、セルを構成するものがある（特開平１０−１２５５５９号、特開平７−９４３７４号参照）。
【０００５】
【発明が解決しようとする課題】
しかしながら、このような従来の電気二重層キャパシタにあっては、それぞれの集電極あるいは電極板をキャパシタの端子に接続するため、それぞれの集電極にリード部を設け、これらのリード部を束ねて端子板に溶着する、あるいはそれぞれの電極板より集電部材を引き出し、これらの集電部材を結束して端子に接続する構成となっていたため、製作性が悪く、コストアップを招いていた。また、セルの組付作業性も悪かった。
【０００６】
この発明は、このような問題点を解決した電気二重層キャパシタを提供することを目的としている。
【０００７】
【課題を解決するための手段】
第１の発明は、セパレータの両側に分極性電極、両分極性電極の外側に集電極を積層して形成した長尺のセルシート基材を、所定長毎に異なる方向に交互に折り返して積層セルを構成すると共に、積層セルの一側の各折り返し部における外層部位の集電極に一方の集電体を接触させることで導通させ、他側の各折り返し部における外層部位の集電極に他方の集電体を接触させることで導通させてなり、前記積層セルならびに各集電体を収容するケースと、前記ケースの開口部内縁に嵌められる嵌合部に、内側に屈曲させた加圧固定部を形成させた蓋を設け、前記ケースの前記開口部内縁に前記蓋が嵌められ、前記ケースの開口端と前記蓋の嵌合上端部とが溶接され、前記蓋を介して前記積層セルに積層方向に所定の面圧を加える。
【０００８】
第２の発明は、第１の発明において、前記積層セルならびに各集電体を収容するケースを設け、前記積層セルはケース内において前記セルシート基材を所定長毎に異なる方向に交互に折り返して構成される。
【０００９】
第３の発明は、第１の発明において、前記積層セルならびに各集電体を収容するケースを設け、各集電体はそれぞれケース内の対向する側面部分に配設される。
【００１０】
第４の発明は、第１の発明において、前記加圧固定部を塑性伸張して、前記積層セルに積層方向に面圧を加える加圧機構を設ける。
【００１１】
【発明の効果】
第１、第２の発明によれば、積層セルの構成を容易に行え、良好な組付性、製作性を確保することができ、コスト低減を十分に図れる。
【００１２】
第３の発明によれば、各折り返し部における外層部位の集電極に集電体を簡単に接触、導通させることができ、一層良好な組付性、製作性を確保することができる。
【００１３】
第１、４の発明によれば、セルの各層内部を均一に密着でき、電気二重層キャパシタの良好な性能を維持できると共に、安定した品質を確保することができる。
【００１４】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
【００１５】
図１、図２において、１０はセルシート基材を、１１は筺型のキャパシタケースを示す。
【００１６】
セルシート基材１０は、セパレータ１２の両側に分極性電極（活性炭電極）１３，１４を、両分極性電極１３，１４の外側に集電極１５、１６を積層して形成されると共に、所定の長さのものが用いられる。
【００１７】
ケース１１は、アルミ材等から所定の大きさに形成され、内面が絶縁シート３０で覆われる。
【００１８】
そして、このケース１１内に、セルシート基材１０が、セパレータ１２、分極性電極１３，１４に電解液を含浸させて、所定長さ毎に異なる方向に交互に折り返して収容され、積層セル１７が構成される。
【００１９】
この場合、セルシート基材１０は、折り返し部１８、１９がケース１１内のそれぞれ対向する側面（絶縁シート３０面）に当接する所定長さにて、折り返される。また、折り返し部１８、１９を含めず、最下層および最上層の長さは各層と同一の長さとなるように形成される。
【００２０】
そして、積層セル１７の一側の各折り返し部１８と、各折り返し部１８が当接するケース１１内の一側面（絶縁シート３０面）との間に集電体２０が差し込まれ、配置される。
【００２１】
また、積層セル１７の他側の各折り返し部１９と、各折り返し部１９が当接するケース１１内の他側面（絶縁シート３０面）との間に集電体２１が差し込まれ、配置される。
【００２２】
この場合、予め集電体２０，２１をケース１１内のそれぞれ該当する側面に配設しておき、その後、ケース１１内にセルシート基材１０を前述のように折り返して収容して、積層セル１７を構成するようにしても良い。
【００２３】
これにより、積層セル１７の一側の各折り返し部１８における外層部位の集電極１５が集電体２０と接触、導通され、他側の各折り返し部１９における外層部位の集電極１６が集電体２１と接触、導通される。
【００２４】
集電体２０，２１の上端部には、キャパシタの端子２２，２３が形成され、これらの端子２２，２３はケース１１の上蓋２４に設けられた端子孔２５，２６に挿通される。
【００２５】
ケース１１の上蓋２４は、ケース１１の開口部内縁に嵌められる嵌合部に、内側に屈曲させた加圧固定部２７（加圧機構）が形成される。
【００２６】
そして、ケース１１の開口部内縁に上蓋２４が嵌められ、ケース１１の開口端部と上蓋２４の嵌合上端部とが溶接されると共に、この後、図示しない油圧機等によって上蓋２４に所定の押圧力が加えられる。
【００２７】
これにより、上蓋２４の加圧固定部２７が塑性伸張され、上蓋２４を介して、積層セル１７に積層方向に所定の面圧が加えられた状態で保持される。
【００２８】
なお、予め積層セル１７の最上層、集電体２０，２１の上端部、上蓋２４の内面の各間には絶縁が施される。
【００２９】
このように、セパレータ１２の両側に分極性電極１３，１４、両分極性電極１３，１４の外側に集電極１５，１６を積層して形成した長尺のセルシート基材１０を、所定長毎に異なる方向に交互に折り返して積層セル１７を構成すると共に、積層セル１７の一側の各折り返し部１８における外層部位の集電極１５に集電体２０を接触させることで導通させ、他側の各折り返し部１９における外層部位の集電極１６に集電体２１を接触させることで導通させる構成としたので、積層セル１７の構成を容易に行え、従来のように各集電極にリード部を設けたり、集電部材を引き出す必要がなく、良好な組付性、製作性を確保することができ、コスト低減を十分に図れる。
【００３０】
また、集電体２０，２１をそれぞれケース１１内の対向する側面部分に配設するので、各折り返し部１８，１９における外層部位の集電極１５，１６に集電体２０，２１を簡単に接触、導通させることができ、一層良好な組付性、製作性を確保することができる。
【００３１】
また、ケース１１（上蓋２４）に、積層セル１７に積層方向に所定の面圧を加えると共に、その面圧を保持する加圧固定部２７を設けたので、セル１７の各層内部を均一に密着でき、キャパシタの良好な性能を維持できると共に、安定した品質を確保することができる。
【図面の簡単な説明】
【図１】実施の形態を示す断面図である。
【図２】部分断面図である。
【符号の説明】
１０はセルシート基材
１１ケース
１２セパレータ
１３，１４分極性電極
１５，１６集電極
１７積層セル
１８，１９折り返し部
２０，２１集電体
２２，２３端子
２４上蓋
２７加圧固定部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric double layer capacitor (electric double layer capacitor).
[0002]
[Prior art]
2. Description of the Related Art In recent years, as various power storage devices (such as a drive power source for an electric vehicle), attention has been focused on an application technology of an electric double layer capacitor that can be rapidly charged and has a long charge / discharge cycle life.
[0003]
Some electric double layer capacitors constitute a cell by stacking a certain number of a set of structural parts including a separator, a polarizable electrode, a collector electrode, a polarizable electrode, and a separator.
[0004]
Also, there are some which constitute a cell by alternately folding long separators in different directions for each predetermined length and sandwiching an electrode plate between them (see Japanese Patent Laid-Open Nos. 10-125559 and 7-94374). ).
[0005]
[Problems to be solved by the invention]
However, in such a conventional electric double layer capacitor, in order to connect each collector electrode or electrode plate to the terminal of the capacitor, each collector electrode is provided with a lead portion, and these lead portions are bundled to form a terminal. Since the current collecting members are welded to the plates or the current collecting members are pulled out from the respective electrode plates, and these current collecting members are bound and connected to the terminals, the manufacturability is poor and the cost is increased. The cell assembly workability was also poor.
[0006]
An object of the present invention is to provide an electric double layer capacitor that solves such problems.
[0007]
[Means for Solving the Problems]
In the first invention, a long cell sheet substrate formed by laminating a polarizable electrode on both sides of a separator and a collector electrode on the outer side of both polarizable electrodes is alternately folded and laminated in different directions for each predetermined length. In addition to constituting the cell, one collector is brought into contact with the collector electrode of the outer layer portion in each folded portion on one side of the stacked cell, and the other collector electrode in the outer layer portion in each folded portion on the other side A current-carrying current collector is brought into contact with each other, a case accommodating each of the stacked cells and each current collector, and a pressure fixing portion bent inward into a fitting portion fitted to an inner edge of the opening of the case The lid is fitted to the inner edge of the opening of the case, the opening end of the case and the fitting upper end of the lid are welded, and stacked on the stacked cell via the lid Apply a predetermined surface pressure in the direction .
[0008]
According to a second invention, in the first invention, a case is provided in which the stacked cell and each current collector are accommodated, and the stacked cell alternately folds the cell sheet substrate in a different direction for each predetermined length in the case. Configured.
[0009]
According to a third invention, in the first invention, a case is provided in which the stacked cell and each current collector are accommodated, and each current collector is disposed on an opposing side surface portion in the case.
[0010]
According to a fourth invention, in the first invention , there is provided a pressurizing mechanism that plastically stretches the pressurizing and fixing portion and applies a surface pressure to the stacked cell in the stacking direction.
[0011]
【The invention's effect】
According to the first and second inventions, the configuration of the stacked cell can be easily performed, good assemblability and manufacturability can be ensured, and the cost can be sufficiently reduced.
[0012]
According to the third aspect of the present invention, the current collector can be easily brought into contact with and connected to the collector electrode at the outer layer portion in each folded portion, and better assembly and manufacturability can be ensured.
[0013]
According to the first and fourth inventions , the inside of each layer of the cell can be uniformly adhered, the good performance of the electric double layer capacitor can be maintained, and stable quality can be ensured.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
1 and 2, reference numeral 10 denotes a cell sheet substrate, and 11 denotes a saddle type capacitor case.
[0016]
The cell sheet substrate 10 is formed by laminating polarizable electrodes (activated carbon electrodes) 13 and 14 on both sides of the separator 12, and collecting electrodes 15 and 16 on the outer sides of the polarizable electrodes 13 and 14. The length is used.
[0017]
The case 11 is formed in a predetermined size from an aluminum material or the like, and the inner surface is covered with an insulating sheet 30.
[0018]
And in this case 11, the cell sheet base material 10 impregnates the separator 12 and the polarizable electrodes 13 and 14 with the electrolytic solution, and is folded back and accommodated alternately in different directions for each predetermined length. Is configured.
[0019]
In this case, the cell sheet substrate 10 is folded back at a predetermined length where the folded portions 18 and 19 abut on the opposing side surfaces (insulating sheet 30 surface) in the case 11. In addition, the lowermost layer and the uppermost layer are formed to have the same length as each layer without including the folded portions 18 and 19.
[0020]
Then, the current collector 20 is inserted and arranged between each folded portion 18 on one side of the stacked cell 17 and one side surface (insulating sheet 30 surface) in the case 11 with which each folded portion 18 abuts.
[0021]
In addition, the current collector 21 is inserted and arranged between each folded portion 19 on the other side of the stacked cell 17 and the other side surface (insulating sheet 30 surface) in the case 11 with which each folded portion 19 abuts.
[0022]
In this case, the current collectors 20 and 21 are previously disposed on the corresponding side surfaces in the case 11, and then the cell sheet base material 10 is folded back and accommodated in the case 11 as described above. 17 may be configured.
[0023]
As a result, the collector electrode 15 in the outer layer portion in each folded portion 18 on one side of the stacked cell 17 is brought into contact with and connected to the current collector 20, and the collector electrode 16 in the outer layer portion in each folded portion 19 on the other side is collected. 21 is contacted and conducted.
[0024]
Capacitor terminals 22 and 23 are formed at the upper ends of the current collectors 20 and 21, and these terminals 22 and 23 are inserted into terminal holes 25 and 26 provided in the upper lid 24 of the case 11.
[0025]
The upper cover 24 of the case 11 is formed with a pressure fixing portion 27 (pressure mechanism) that is bent inward at a fitting portion that is fitted to the inner edge of the opening of the case 11.
[0026]
Then, the upper lid 24 is fitted to the inner edge of the opening of the case 11, and the opening end of the case 11 and the fitting upper end of the upper lid 24 are welded. Thereafter, the upper lid 24 is fixed to the upper lid 24 by a hydraulic machine (not shown). A pressing force is applied.
[0027]
As a result, the pressure fixing portion 27 of the upper lid 24 is plastically stretched and is held via the upper lid 24 in a state where a predetermined surface pressure is applied to the stacked cells 17 in the stacking direction.
[0028]
Insulation is previously provided between the uppermost layer of the stacked cell 17, the upper ends of the current collectors 20 and 21, and the inner surface of the upper lid 24.
[0029]
In this way, the long cell sheet substrate 10 formed by laminating the polarizable electrodes 13 and 14 on both sides of the separator 12 and the collector electrodes 15 and 16 outside the both polarizable electrodes 13 and 14 is provided for each predetermined length. The stacked cells 17 are alternately folded in different directions, and the collector 20 is brought into conduction by bringing the collector 20 into contact with the collector electrode 15 in the outer layer portion of each folded portion 18 on one side of the stacked cell 17. Since the current collector 21 is brought into conduction by bringing the current collector 21 into contact with the collector electrode 16 at the outer layer portion in each folded portion 19, the stacked cell 17 can be easily configured, and a lead portion is provided on each collector electrode as in the conventional case In addition, it is not necessary to pull out the current collecting member, it is possible to ensure good assembling property and manufacturability, and the cost can be sufficiently reduced.
[0030]
Further, since the current collectors 20 and 21 are respectively disposed on opposite side portions in the case 11, the current collectors 20 and 21 are simply brought into contact with the collector electrodes 15 and 16 in the outer layer portions of the folded portions 18 and 19. Therefore, it is possible to ensure electrical connection, and it is possible to secure better assembling properties and manufacturability.
[0031]
In addition, the case 11 (upper lid 24) is provided with a pressure fixing portion 27 that applies a predetermined surface pressure to the stacked cell 17 in the stacking direction and maintains the surface pressure. In addition, the good performance of the capacitor can be maintained, and stable quality can be ensured.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment.
FIG. 2 is a partial cross-sectional view.
[Explanation of symbols]
10 is a cell sheet base material 11 Case 12 Separator 13, 14 Polarization electrode 15, 16 Collector electrode 17 Stacked cell 18, 19 Folded parts 20, 21 Current collector 22, 23 Terminal 24 Upper lid 27 Pressure fixing part

Claims

セパレータの両側に分極性電極、両分極性電極の外側に集電極を積層して形成した長尺のセルシート基材を、所定長毎に異なる方向に交互に折り返して積層セルを構成すると共に、
積層セルの一側の各折り返し部における外層部位の集電極に一方の集電体を接触させることで導通させ、他側の各折り返し部における外層部位の集電極に他方の集電体を接触させることで導通させてなり、
前記積層セルならびに各集電体を収容するケースと、前記ケースの開口部内縁に嵌められる嵌合部に、内側に屈曲させた加圧固定部を形成させた蓋を設け、前記ケースの前記開口部内縁に前記蓋が嵌められ、前記ケースの開口端と前記蓋の嵌合上端部とが溶接され、前記蓋を介して前記積層セルに積層方向に所定の面圧を加えることを特徴とする電気二重層キャパシタ。A long cell sheet substrate formed by laminating a polarizable electrode on both sides of a separator and a collector electrode on the outside of both polarizable electrodes is configured to fold back alternately in different directions for each predetermined length, thereby forming a laminated cell.
One collector is brought into contact with the collector electrode at the outer layer portion at each folded portion on one side of the stacked cell, and the other collector is brought into contact with the collector electrode at the outer layer portion at each folded portion on the other side. I made it conductive ,
A case in which the stacked cell and each current collector are accommodated, and a fitting portion that is fitted to an inner edge of the opening of the case is provided with a lid formed with a pressure fixing portion bent inward, and the opening of the case The lid is fitted to the inner edge of the part, the opening end of the case and the fitting upper end of the lid are welded, and a predetermined surface pressure is applied to the stacked cell via the lid in the stacking direction. Electric double layer capacitor.

前記積層セルはケース内において前記セルシート基材を所定長毎に異なる方向に交互に折り返して構成されることを特徴とする請求項１に記載の電気二重層キャパシタ。 2. The electric double layer capacitor according to claim 1, wherein the multilayer cell is configured by alternately folding the cell sheet base material in a different direction for each predetermined length in a case.

各集電体はそれぞれケース内の対向する側面部分に配設されることを特徴とする請求項１に記載の電気二重層キャパシタ。 2. The electric double layer capacitor according to claim 1, wherein each of the current collectors is disposed on a side surface portion facing each other in the case.

前記加圧固定部を塑性伸張して、前記積層セルに積層方向に面圧を加える加圧機構を設けたことを特徴とする請求項１に記載の電気二重層キャパシタ。 2. The electric double layer capacitor according to claim 1 , further comprising: a pressure mechanism that plastically stretches the pressure fixing portion to apply a surface pressure to the stacked cell in a stacking direction.