JP4018880B2

JP4018880B2 - Electric double layer capacitor and manufacturing method thereof

Info

Publication number: JP4018880B2
Application number: JP2001086640A
Authority: JP
Inventors: 英雄小野; 修一荒木
Original assignee: UD Trucks Corp
Current assignee: UD Trucks Corp
Priority date: 2001-03-26
Filing date: 2001-03-26
Publication date: 2007-12-05
Anticipated expiration: 2021-03-26
Also published as: JP2002289486A

Abstract

PROBLEM TO BE SOLVED: To provide an electric double layer capacitor and a reasonable manu facturing method therefor which effectively seals a container without an interfer ence with capacitor electrodes (a pair of terminals). SOLUTION: The capacitor comprises a capacitor body 10 composed of the same number of positive and negative electrodes alternately laminated with separators inserted between them, and a container 11 which houses the capacitor body 10 together with an electrolyte and is sealed. Like poles of leads 13 of a positive electrode and negative electrode are collected to form laminate parts bonded to a pair of terminals 14 fixed to the inner surface of the container 11.

Description

【０００１】
【発明の属する技術分野】
この発明は、キャパシタ（電気二重層キャパシタ）およびその製造方法に関する。
【０００２】
【従来の技術】
近年、各種の蓄電装置（電気自動車の駆動電源など）として、急速充電が可能で充放電サイクル寿命の長い、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は、同数の正極体と負極体をこれらの間にセパレータを介在させて交互に積層して構成される。これらの積層体は電解液に浸され、容器（ケース）に収容される（特開２０００−２００７３８号、参照）。なお、特開平１１−１８６１０２号，特開平１１−２８３８７１号において、電気二重層キャパシタの関連技術が開示される。
【０００４】
【発明が解決しようとする課題】
図６は、電気二重層キャパシタの一例を説明するものであり、１はキャパシタ本体（図示せず）を電解液と共に収容する容器、２は容器１の外部へ引き出される１対の端子板（キャパシタ電極）であり、各端子板２ａ，２ｂは容器１の内部でそれぞれ対応する極性のリード部の重層部に接合される。
【０００５】
キャパシタ本体において、正極体および負極体の集電極は、アルミ箔で形成され、その片面に活性炭電極（分極性電極）が構成される。これら集電極にリード部が形成され、これらの同極どうしを集める重層部に端子板２が接合されるのである。端子板２との接合には、良好な電導性を確保しつつ、アルミ箔のリード部に損傷を与えないよう、超音波溶接・スポット溶接などが用いられる。
【０００６】
容器１の内部は、キャパシタ本体を納めて電解液に浸し、余分な電解液を抜き取りながら真空状態に密封される。製品としての電気二重層キャパシタＡは、電動車両の駆動電源に適用する場合、数多くを直並列に接続（たとえば、直列接続においては、端子板２ａ，２ｂの異極どうしを順次に接合）して所要容量の組電池に構成される。
【０００７】
このような電気二重層キャパシタにおいては、１対の端子板２ａ，２ｂが外部へ引き出されるため、容器１の密封性を確保するのが難しい。その密封手段としては、容器１を樹脂フィルムから作り、熱シールを施すことが考えられる。しかし、樹脂フィルムの熱シールは、端子板２との確実な融合性が得られず、密閉度の安定性に欠ける。また、端子板２のエッヂ（角部）に樹脂層が傷められ、亀裂も生じやすい。
【０００８】
この発明は、このような課題に着目してなされたものであり、１対の端子部に干渉されず、容器の密封が有効に処理可能な電気二重層キャパシタおよびその合理的な製造方法の提供を目的とする。
【０００９】
【課題を解決するための手段】
第１の発明は、電気二重層キャパシタにおいて、同数の正極体と負極体をこれらの間にセパレータを介在させて交互に積層して構成されるキャパシタ本体と、１対の端子部と共にキャパシタ本体を納めて真空状態に密封される容器と、を備えてなり、容器は、真空状態に密封されるとその内部に位置する端子部の外形が表面に浮き出る程度の柔軟性を備える材質から作られ、各端子部は、容器の内面に接着するコマ部と、その側方へ張り出すシート部とからなり、シート部に対応するリード部の重層部を接合する一方、コマ部に外部端子との接合用の上下に貫通する穴を形成され、真空状態に密封した容器の表面に外形が浮き出る端子部の穴を利用して容器を貫通する締着手段によりコマ部と外部端子との間を接合可能に構成したことを特徴とする
【００１０】
第２の発明は、電気二重層キャパシタにおいて、同数の正極体と負極体をこれらの間にセパレータを介在させて交互に積層して構成されるキャパシタ本体と、１対の端子部と共にキャパシタ本体を納めて真空状態に密封される容器と、を備えてなり、容器は真空状態に密封されるとその内部に位置する端子部の外形が表面に浮き出る程度の柔軟性を備える材質から作られ、各端子部は、コマ部に外部端子との接合用上下に貫通する穴が形成され、真空状態に密封した容器の表面に外形が浮き出る端子部の穴を利用して容器を貫通する締着手段によりリード部の重層部とこれに重なるコマ部との間およびコマ部と外部端子との間を接合したことを特徴とする。
【００１１】
第３の発明は、第１の発明または第２の発明に係る電気二重層キャパシタにおいて、容器は、アルミラミネートから作られ、締着手段の貫通により生じる穴の絶縁シールを備えたことを特徴とする。
第４の発明は、第２の発明に係る電気二重層キャパシタにおいて、容器を貫通する締着手段として、リベットまたはビスを用いたことを特徴とする。
【００１２】
第５の発明は、同数の正極体と負極体をこれらの間にセパレータを介在させて交互に積層して構成されるキャパシタ本体と、１対の端子部と共にキャパシタ本体を納めて真空状態に密封される容器と、を備える電気二重層キャパシタの製造方法において、コマ部とその側方へ張り出すシート部とコマ部の中央に外部端子との接合用の上下に貫通する穴とから構成される端子部を作成する工程と、１対の端子部と共にキャパシタ本体を納めるための容器を真空状態に密封されるとその内部に位置する端子部の外形が表面に浮き出る程度の柔軟性を備える材質から作成する工程と、集電極をリード部と一体に型抜きする工程と、所定数の集電極のリード部を集めてこれら同極どうしの重層部に対応する端子部のシート部を接合する工程と、正極の集電極と負極の集電極との間に分極性電極およびセパレータを組み付けてキャパシタ本体を構成する工程と、１対の端子部と共にキャパシタ本体を容器に納めて各コマ部の穴の開口面を容器の内面に接着する工程と、キャパシタ本体を電解液に浸す工程と、余分な電解液を抜き取りながら容器の内部を真空状態に密封する工程と、を備えたことを特徴とする。
【００１３】
第６の発明は、同数の正極体と負極体をこれらの間にセパレータを介在させて交互に積層して構成されるキャパシタ本体と、１対の端子部と共にキャパシタ本体を納めて真空状態に密封される容器と、を備える電気二重層キャパシタの製造方法において、コマ部とその中央に外部端子との接合用の上下に貫通する穴とから構成される端子部を作成する工程と、１対の端子部と共にキャパシタ本体を納めるための容器を真空状態に密封されるとその内部に位置する端子部の外形が表面に浮き出る程度の柔軟性を備える材質から作成する工程と、同数の正極体と負極体をこれらの間にセパレータを介在させて交互に積層してキャパシタ本体を構成する工程と、１対の端子部と共にキャパシタ本体を容器に納めて端子部の穴の開口面を対応するリード部の重層部に重ねる工程と、キャパシタ本体を電解液に浸す工程と、余分な電解液を抜き取りながら容器の内部を真空状態に密封する工程と、密封後の容器の表面に外形が浮き出る端子部の穴を利用して容器を貫通する締着手段によりリード部の重層部とこれに重なるコマ部との間およびコマ部と外部端子との間を接合する工程と、を備えたことを特徴とする。
【００１４】
【発明の効果】
第１の発明または第２の発明においては、１対の端子部は、容器にキャパシタ本体と共に納め、容器の内面に固着される。そのため、これら端子部は、容器の外部へ引き出されるもの（図６、参照）と異なり、容器の密封を妨げるようなことがなく、容器の安定した良好な密閉度を容易に確保できる。また、１対の端子部は、容器の内部に組み付けられるが、容器が柔軟性を備えるので、真空引きにより、容器の表面に外形が浮き出るため、端子部の穴を利用して締着手段により外部端子との接合を簡単かつ能率よく処理できる。
【００１５】
第３の発明においては、アルミラミネートは、その積層構造にアルミ層が含まれるが、容器内部の各端子部と外部端子との接合が絶縁シールで保護され、アルミラミネートへの漏電を防止できる。
【００１６】
第４の発明においては、各端子部と外部端子との接合は、リベットまたはビスにより、簡単かつ能率よく処理され、大容量の組電池を廉価に構成できる。
【００１７】
第５の発明または第６の発明においては、容器の密閉度が高く、品質の安定した電気二重層キャパシタを能率よく大量生産することが可能となり、信頼性および耐久性の高い電気二重層キャパシタを廉価に供給できる。
【００１８】
第６の発明においては、コマ部と各リード部の重層部との接合，コマ部と外部端子との接合、が同時に図れるばかりでなく、第５の発明に較べると、コマ部がシート部を備えないので、容器の容積を大きくすることなく、電気二重層キャパシタの容量を大きく設定可能となる。
【００１９】
【発明の実施の形態】
図１，図２において、１０は同数の正極体と負極体をこれらの間にセパレータを介在させて交互に積層して構成されるキャパシタ本体であり、容器１１（一部のみ図示）に電解液と共に収容して密封される。
【００２０】
正極体および負極体は、所定数に重層するアルミ箔を型抜き加工することにより、同形同大に形成される。各アルミ箔の矩形平面の両側に活性炭電極（分極性電極）が構成され、これらのそれぞれに帯状のリード部１３が矩形平面の１辺の片側に寄せて一体に備えられる。
【００２１】
容器１１は、所定の要件を備える材質（この例においては、アルミラミネート）から袋状に構成され、その内面の所定位置に１対の端子部１４ａ，１４ｂが固着される。
【００２２】
端子部１４は、コマ部１５とその側方へ張り出す板部１６（シート部）とからなり、シート部１６の先端側に各集電極のリード部１３ａ，１３ｂの同極どうしを集める重層部が接合される。この場合、コマ部１５およびシート部１６（図３（ａ）、参照）は、アルミで形成され、コマ部１５の中央に外部端子との接合用の穴１７（上下に貫通する）が形成される。
【００２３】
各リード部１３ａ，１３ｂの重層部と対応する各端子部のシート部１６との接合は、良好な電導性に確保しつつ、アルミ箔のリード部に損傷を与えないよう、超音波溶接・スポット溶接などが用いられる。
【００２４】
容器の材質要件としては、▲１▼電解液の外部への滲出を防止できる、▲２▼電解液に溶解しない、▲３▼外気（水分や酸素）の侵入を防止できる（高い密閉性を備える）、▲４▼真空状態に密封されると、その内部に配置の端子部の外形が表面に浮き出る程度の柔軟性を備える、ことが挙げられる。これらの要件を満たせるなら、必ずしもアルミラミネートに限定されるものではない。
【００２５】
製品としての電気二重層キャパシタＢは、電動自動車の駆動電源に適用する場合、数多くを直並列に接続して所要容量の組電池に構成される。その際、容器１１内部の端子部１４において、コマ部１５にその穴１７を利用して外部から容器１１を貫通する締着手段（リベットやビスなど）により外部端子が接合される。
【００２６】
アルミラミネートは、その積層構造にアルミ層が含まれるので、アルミラミネートへの漏電を防止するため、容器１１内部の各端子部１４と外部端子との接合より生じる穴の絶縁シールが備えられる。
【００２７】
このような電気二重層キャパシタＢにおいては、容器１１に１対の端子部１４がキャパシタ本体１０と共に納められ、容器１１の内面に固着するため、容器１１の外部へ端子板２を引き出される場合（図６、参照）に較べると、容器１１の密封を妨げるようなことがなく、容器１１の安定した良好な密閉度を容易に確保できる。
【００２８】
１対の端子部１４は、容器１１の内部に組み付けられるが、容器１１が柔軟性を備えるので、真空引きにより、容器１１の外形に浮き出るため、その位置が目視で確認可能となり、外部端子との接合が容易に処理できる。各端子部１４と外部端子との接合は、締着手段にリベットまたはビスを用いることにより、簡単かつ能率よく処理され、大容量の組電池を廉価に構成できる。
【００２９】
図３は電気二重層キャパシタＢの製造過程を説明するものであり、（ａ）において、所定数に重層するアルミ箔から、集電極をリード部１３と一体の型抜きする。ついで、これら集電極のリード部１３ａ，１３ｂを集めてこれら同極どうしの重層部に端子部１４のシート部１６を接合する。それから、正極の集電極と負極の集電極との間に分極性電極およびセパレータを組み付けてキャパシタ本体１０を構成するのである。
【００３０】
その後、１対の端子部１４ａ，１４ｂと共にキャパシタ本体１０を袋状（１辺が開口する）の容器１１に納め、位置決めが済むと、各端子部１４を容器１１の内面に接着する。なお、各コマ部１５の穴１７周辺に予め接着剤１８を塗布しておくと良い。キャパシタ本体１０は、電解液に浸されるが、この処理は容器１１に納める前に行うようにしても良い。
【００３１】
それから、（ｂ）において、余分な電解液を抜き取りながら、容器１１の内部を真空状態に密封する。袋（容器１１）の開口は、真空引きのパイプ１９を挿入した状態でその部位を除く大部分を熱シールで密閉する。真空引きにより、袋１１は大気圧で圧縮され、キャパシタ本体１０（正極体とセパレータと負極体との積層体）が圧着され、積層間の位置ずれ等も抑えられる。この真空吸引が終了したら、吸引パイプ１９を抜き取りながら、その部位を熱シールで密閉する。
【００３２】
このような製造過程に基づいて、容器１１の密閉度が高く、品質の安定した電気二重層キャパシタＢを能率よく大量生産することが可能となり、信頼性および耐久性の高い電気二重層キャパシタＢを廉価に供給できる。
【００３３】
図４，図５は、別の実施形態を表すものであり、各リードの重層部と外部電極との接続の合理化および容器容積の有効利用を図るため、各端子部のシート部（図１〜図３の１６）が削減される。各端子部２０は、穴２２付きのコマ部２１（電極カラーと称する）のみとなり、容器１１の内部において、キャパシタ本体１０と共に納められ、各リード１３の重層部に重ねられる。そして、電極カラー２０は、容器１１を真空状態に密封することにより、大気圧に圧縮される容器１１に抑えられ、各リード１３（１３ａ，１３ｂ）の重層部に重なる状態に固定される。
【００３４】
この状態において、容器１１の表面（電極カラー２０の外形が浮き出る部分）に外部端子２３が当てられ、アルミリベット２５により、電極カラー２０と各リード部１３の重層部，電極カラー２０と外部電極２３、がそれぞれ容器１１に共締めされるのである。２４は容器１１とアルミリベット２５との間に介装される絶縁カラーであり、アルミラミネート（袋１１）への漏電を防止する機能も果たす。
【００３５】
これによると、電極カラー２０と各リード部１３の重層部との接合，電極カラー２０と外部端子２３との接合、がアルミリベット２５で同時に図れるばかりでなく、端子部２０がシート部（張り出し部分）を備えないので、その分の空間を有効利用（つまり、キャパシタ本体１０の積層面積が大きく取れるので、容器の容積を大きくすることなく、電気二重層キャパシタＢの容量を大きく設定）可能となる。もちろん、アルミリベット２５の代わりにアルミビスを電極カラー２０の穴２２に螺合するようにしても良い。
【図面の簡単な説明】
【図１】この発明の実施形態を表す一部省略の断面構成図である。
【図２】同じくＸ−Ｘ方向の断面構成図である。
【図３】同じく製造過程の説明図である。
【図４】別の実施形態を表す一部省略の断面構成図である。
【図５】同じく要部の断面構成図である。
【図６】背景技術の説明図である。
【符号の説明】
１０キャパシタ本体
１１容器
１３（１３ａ，１３ｂ）リード部
１４（１４ａ，１４ｂ）端子部
１５コマ部
１６シート部
１８接着剤
１９吸引パイプ
２０電極カラー（端子部）
２３外部端子
２４絶縁シール
２５アルミリベット[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a capacitor (electric double layer capacitor) and a method for manufacturing the same.
[0002]
[Prior art]
2. Description of the Related Art In recent years, as various power storage devices (such as drive power sources for electric vehicles), attention has been focused on application technologies of electric double layer capacitors that can be rapidly charged and have a long charge / discharge cycle life.
[0003]
An electric double layer capacitor is configured by alternately laminating the same number of positive and negative electrode bodies with separators interposed therebetween. These laminates are immersed in an electrolytic solution and accommodated in a container (case) (see Japanese Patent Application Laid-Open No. 2000-200388). In Japanese Patent Application Laid-Open Nos. 11-186102 and 11-283871, related techniques for electric double layer capacitors are disclosed.
[0004]
[Problems to be solved by the invention]
FIG. 6 illustrates an example of an electric double layer capacitor. Reference numeral 1 denotes a container for storing a capacitor body (not shown) together with an electrolytic solution, and 2 denotes a pair of terminal plates (capacitors) drawn out of the container 1. The terminal plates 2a and 2b are joined to the multilayer portions of the corresponding lead portions in the container 1 respectively.
[0005]
In the capacitor body, the positive and negative electrode collectors are formed of aluminum foil, and an activated carbon electrode (polarizable electrode) is formed on one surface thereof. Lead portions are formed on these collector electrodes, and the terminal plate 2 is joined to the multi-layer portion that collects the same polarities. For joining to the terminal plate 2, ultrasonic welding, spot welding, or the like is used so as not to damage the lead portion of the aluminum foil while ensuring good electrical conductivity.
[0006]
The inside of the container 1 is sealed in a vacuum state while accommodating the capacitor body and immersing it in the electrolyte, and removing the excess electrolyte. When the electric double layer capacitor A as a product is applied to a drive power source of an electric vehicle, many are connected in series and parallel (for example, in the case of series connection, the different polarities of the terminal plates 2a and 2b are sequentially joined). The battery pack is configured to have the required capacity.
[0007]
In such an electric double layer capacitor, since the pair of terminal plates 2a and 2b are drawn out to the outside, it is difficult to ensure the sealing performance of the container 1. As the sealing means, it can be considered that the container 1 is made of a resin film and heat-sealed. However, the heat sealing of the resin film does not provide reliable fusion with the terminal plate 2 and lacks stability of the sealing degree. Further, the resin layer is damaged at the edge (corner portion) of the terminal board 2 and cracks are likely to occur.
[0008]
The present invention has been made paying attention to such a problem, and provides an electric double layer capacitor capable of effectively treating the sealing of a container without interfering with a pair of terminal portions, and a rational manufacturing method thereof With the goal.
[0009]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided an electric double layer capacitor having a capacitor body formed by alternately laminating the same number of positive and negative electrode bodies with separators interposed therebetween, and a capacitor body together with a pair of terminal portions. A container that is sealed and sealed in a vacuum state, and the container is made of a material that is flexible so that the outer shape of the terminal portion located inside when the container is sealed in a vacuum state, each terminal unit includes a frame portion which adheres to the inner surface of the container consists of a sheet portion projecting to the side, while joining the multilayer portion of the lead portion corresponding to the seat portion, the junction between the external terminal to the frame portion It is formed a hole through the top and bottom of the use, bondable between the frame portion and the external terminal by fastening means passing through the container by utilizing the hole of the terminal part stand out outer shape to the surface of the sealed containers to a vacuum Characterized by the configuration To [0010]
According to a second aspect of the present invention, in the electric double layer capacitor, the same number of positive electrode bodies and negative electrode bodies are laminated alternately with a separator interposed therebetween, and the capacitor main body together with a pair of terminal portions. A container that is sealed and sealed in a vacuum state, and the container is made of a material having flexibility such that the outer shape of the terminal portion located inside when the container is sealed in a vacuum state. The terminal part is formed by a fastening means that penetrates the container using a hole in the terminal part that has an outer shape that emerges from the surface of the container that is sealed in a vacuum state. characterized in that joined to and between the frame portion and the external terminals of the multilayer portion and a frame portion that overlaps to the lead portion.
[0011]
According to a third invention, in the electric double layer capacitor according to the first or second invention, the container is made of an aluminum laminate and includes an insulating seal for a hole generated by penetration of the fastening means. To do.
According to a fourth invention, in the electric double layer capacitor according to the second invention, rivets or screws are used as fastening means penetrating the container .
[0012]
According to a fifth aspect of the present invention, a capacitor body configured by alternately stacking the same number of positive and negative electrode bodies with separators interposed therebetween, and a capacitor body together with a pair of terminal portions are sealed in a vacuum state. a container and method of manufacturing the electric double layer capacitor comprising a being composed of a hole penetrating the center of the seat and the frame portion projecting into the frame section and its sides in the vertical for joining the external terminal From the material which has the flexibility to the extent that the outer shape of the terminal part located inside the process of creating the terminal part and the container for housing the capacitor body together with the pair of terminal parts is sealed in a vacuum state. A step of creating, a step of die-cutting the collector electrode integrally with the lead portion, a step of collecting the lead portions of a predetermined number of collector electrodes, and joining the sheet portions of the terminal portions corresponding to the multilayer portions of the same polarity The positive electrode The step of assembling a polarizable electrode and a separator between the electrode and the negative electrode collecting electrode to form a capacitor body, and the capacitor body together with a pair of terminal portions in the container, and the opening surface of the hole in each of the top portions of the container It is characterized by comprising a step of adhering to the inner surface, a step of immersing the capacitor main body in an electrolytic solution, and a step of sealing the inside of the container in a vacuum state while removing excess electrolytic solution.
[0013]
According to a sixth aspect of the present invention, a capacitor body configured by alternately laminating the same number of positive and negative electrode bodies with separators interposed therebetween, and a capacitor body together with a pair of terminal portions are sealed in a vacuum state. in the electric double layer capacitor manufacturing method comprising a container, a is a step of creating a terminal portion composed of a hole penetrating vertically for joining the frame portion and the external terminal in the center, a pair of a step of the containers to pay capacitor body with the terminal portion is sealed in a vacuum state outer terminal portion located inside is made from a material having a flexibility enough to stand out on the surface, the same number of positive electrode and the negative electrode A process of forming a capacitor body by alternately laminating a body with separators interposed therebetween, and a capacitor body together with a pair of terminal portions placed in a container, and the opening surface of the hole of the terminal portion corresponding to the corresponding lead A step of superimposing the capacitor body in the electrolytic solution, a step of sealing the inside of the container in a vacuum state while removing excess electrolytic solution, and a terminal portion whose outer shape is exposed on the surface of the sealed container And a step of joining between the multi-layered portion of the lead portion and the top portion overlapping the lead portion and between the top portion and the external terminal by a fastening means that penetrates the container using the holes of To do.
[0014]
【The invention's effect】
In the first invention or the second invention, the pair of terminal portions are housed in the container together with the capacitor body, and are fixed to the inner surface of the container. For this reason, unlike those drawn out of the container (see FIG. 6), these terminal portions do not hinder the sealing of the container and can easily ensure a stable and good sealing degree of the container. In addition, the pair of terminal portions are assembled inside the container, but since the container has flexibility, the outer shape is raised on the surface of the container by evacuation. Bonding with external terminals can be processed easily and efficiently.
[0015]
In the third invention, the aluminum laminate includes an aluminum layer in the laminated structure, but the junction between each terminal portion inside the container and the external terminal is protected by an insulating seal, and leakage to the aluminum laminate can be prevented .
[0016]
In the fourth invention, the joining of each terminal portion and the external terminal is easily and efficiently processed by rivets or screws, and a large-capacity assembled battery can be constructed at low cost .
[0017]
In the fifth invention or the sixth invention , it is possible to efficiently mass-produce an electric double layer capacitor having a high sealing degree and a stable quality, and an electric double layer capacitor having high reliability and durability is provided. It can be supplied at a low price.
[0018]
In the sixth invention, not only the joining of the top part and the multilayer part of each lead part and the joining of the top part and the external terminal can be achieved at the same time, but the top part has a sheet part as compared with the fifth invention. Since it is not provided, the capacity of the electric double layer capacitor can be set large without increasing the volume of the container .
[0019]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2, reference numeral 10 denotes a capacitor body which is formed by alternately laminating the same number of positive and negative electrode bodies with separators interposed therebetween, and an electrolytic solution is provided in a container 11 (only a part of which is shown). And housed and sealed.
[0020]
The positive electrode body and the negative electrode body are formed in the same shape and size by die-cutting an aluminum foil layered in a predetermined number. Activated carbon electrodes (polarizable electrodes) are formed on both sides of a rectangular plane of each aluminum foil, and a strip-like lead portion 13 is integrally provided on each side of the aluminum foil so as to be close to one side of the rectangular plane.
[0021]
The container 11 is formed into a bag shape from a material having predetermined requirements (in this example, aluminum laminate), and a pair of terminal portions 14a and 14b are fixed to predetermined positions on the inner surface thereof.
[0022]
The terminal portion 14 includes a top portion 15 and a plate portion 16 (sheet portion) projecting to the side thereof, and a multi-layer portion that collects the same polarity of the lead portions 13a and 13b of each collector electrode on the leading end side of the sheet portion 16. Are joined. In this case, the top part 15 and the sheet part 16 (see FIG. 3A) are made of aluminum, and a hole 17 (through vertically) is formed at the center of the top part 15 for connection to an external terminal. The
[0023]
Ultrasonic welding / spotting is performed so that the multilayered portions of the lead portions 13a and 13b and the corresponding sheet portions 16 of the terminal portions are bonded to each other while ensuring good electrical conductivity and not damaging the lead portions of the aluminum foil. Welding or the like is used.
[0024]
The material requirements for the container are as follows: (1) The electrolyte can be prevented from exuding to the outside, (2) The electrolyte cannot be dissolved, (3) The outside air (moisture and oxygen) can be prevented from entering (highly sealed) ), (4) When sealed in a vacuum state, the outer shape of the terminal portion disposed therein is provided with flexibility to the extent that it floats on the surface. As long as these requirements can be satisfied, it is not necessarily limited to aluminum laminate.
[0025]
When the electric double layer capacitor B as a product is applied to a drive power source of an electric automobile, a large number of the electric double layer capacitors B are connected in series and parallel to form an assembled battery having a required capacity. At that time, in the terminal portion 14 inside the container 11, the external terminal is joined to the top portion 15 by using fastening holes (rivets, screws, etc.) that penetrate the container 11 from the outside using the holes 17.
[0026]
Since the aluminum laminate includes an aluminum layer, the aluminum laminate is provided with an insulating seal for a hole formed by joining each terminal portion 14 inside the container 11 and an external terminal in order to prevent electric leakage to the aluminum laminate.
[0027]
In such an electric double layer capacitor B, a pair of terminal portions 14 are housed in the container 11 together with the capacitor body 10 and are fixed to the inner surface of the container 11, so that the terminal plate 2 is pulled out of the container 11 ( Compared to FIG. 6), it is possible to easily ensure a stable and good sealing degree of the container 11 without hindering the sealing of the container 11.
[0028]
The pair of terminal portions 14 are assembled inside the container 11. However, since the container 11 has flexibility, the container 11 is raised to the outer shape of the container 11 by evacuation, so that its position can be visually confirmed. Can be easily processed. The joining of each terminal portion 14 and the external terminal is easily and efficiently processed by using rivets or screws as fastening means, and a large capacity assembled battery can be constructed at low cost.
[0029]
FIG. 3 illustrates a manufacturing process of the electric double layer capacitor B. In FIG. 3A, the collector electrode and the lead part 13 are die-cut from an aluminum foil layered in a predetermined number. Next, the lead portions 13a and 13b of these collector electrodes are collected, and the sheet portion 16 of the terminal portion 14 is joined to the multilayer portion of the same polarity. Then, the capacitor body 10 is configured by assembling a polarizable electrode and a separator between the positive collector and the negative collector.
[0030]
Thereafter, the capacitor main body 10 together with the pair of terminal portions 14a and 14b is placed in a bag-like (opened on one side) container 11, and after positioning, the terminal portions 14 are bonded to the inner surface of the container 11. Note that an adhesive 18 may be applied in advance around the hole 17 of each frame portion 15. The capacitor body 10 is immersed in the electrolytic solution, but this treatment may be performed before being placed in the container 11.
[0031]
Then, in (b), the inside of the container 11 is sealed in a vacuum state while removing excess electrolyte. Most of the opening of the bag (container 11) is sealed with a heat seal except the portion with the evacuated pipe 19 inserted. By vacuuming, the bag 11 is compressed at atmospheric pressure, the capacitor body 10 (laminated body of the positive electrode body, the separator, and the negative electrode body) is pressure-bonded, and misalignment between the laminated layers is also suppressed. When this vacuum suction is completed, the part is sealed with a heat seal while removing the suction pipe 19.
[0032]
Based on such a manufacturing process, it becomes possible to efficiently mass-produce the electric double layer capacitor B having a high degree of sealing of the container 11 and stable in quality, and the electric double layer capacitor B having high reliability and durability can be obtained. It can be supplied at a low price.
[0033]
4 and 5 show another embodiment. In order to rationalize the connection between the multilayer portion of each lead and the external electrode and to effectively use the container volume, the sheet portion (FIGS. 16) in FIG. 3 is reduced. Each terminal portion 20 is only a top portion 21 (referred to as an electrode collar) with a hole 22, and is housed together with the capacitor body 10 inside the container 11, and overlapped with the multilayer portion of each lead 13. The electrode collar 20 is held in the container 11 that is compressed to atmospheric pressure by sealing the container 11 in a vacuum state, and is fixed in a state where it overlaps the multilayer portion of each lead 13 (13a, 13b).
[0034]
In this state, the external terminal 23 is applied to the surface of the container 11 (the part where the outer shape of the electrode collar 20 is raised), and the aluminum collar rivets 25 are used to overlap the electrode collar 20 and the lead portions 13, the electrode collar 20 and the external electrode 23. Are fastened together with the container 11. Reference numeral 24 denotes an insulating collar interposed between the container 11 and the aluminum rivet 25, and also functions to prevent electric leakage to the aluminum laminate (bag 11).
[0035]
According to this, not only the joining of the electrode collar 20 and the multilayer portion of each lead part 13 and the joining of the electrode collar 20 and the external terminal 23 can be achieved simultaneously with the aluminum rivet 25, but the terminal part 20 is also formed of a sheet part (an overhang part). ) Is effectively used (that is, the laminated area of the capacitor body 10 can be increased, so that the capacity of the electric double layer capacitor B can be set large without increasing the volume of the container). . Of course, instead of the aluminum rivet 25, an aluminum screw may be screwed into the hole 22 of the electrode collar 20.
[Brief description of the drawings]
FIG. 1 is a partially omitted cross-sectional configuration diagram showing an embodiment of the present invention.
FIG. 2 is a cross-sectional configuration diagram in the XX direction.
FIG. 3 is also an explanatory diagram of the manufacturing process.
FIG. 4 is a partially omitted cross-sectional configuration diagram showing another embodiment.
FIG. 5 is a cross-sectional configuration diagram of the main part of the same.
FIG. 6 is an explanatory diagram of background art.
[Explanation of symbols]
10 Capacitor body 11 Container 13 (13a, 13b) Lead part 14 (14a, 14b) Terminal part 15 Frame part 16 Sheet part 18 Adhesive 19 Suction pipe 20 Electrode collar (terminal part)
23 External terminal 24 Insulation seal 25 Aluminum rivet

Claims

A capacitor body configured by alternately laminating the same number of positive and negative electrode bodies with separators interposed therebetween, and a container sealed with a capacitor body together with a pair of terminal portions and sealed in a vacuum state. piece with it, the container, when sealed in a vacuum state outer terminal portions located therein are made of a material having flexibility enough to stand out on the surface, the terminal portion, which adheres to the inner surface of the container Part and a sheet part projecting to the side, and the multi-layer part of the lead part corresponding to the sheet part is joined, while the top part is formed with a hole penetrating vertically for joining with the external terminal, and vacuum An electric double layer capacitor characterized in that it can be joined between a top part and an external terminal by fastening means penetrating the container using a hole of a terminal part whose outer shape floats on the surface of the container sealed in a state .

A capacitor body configured by alternately laminating the same number of positive and negative electrode bodies with separators interposed therebetween, and a container sealed with a capacitor body together with a pair of terminal portions and sealed in a vacuum state. When the container is sealed in a vacuum state, it is made of a material that is flexible so that the outer shape of the terminal part located inside the container is raised on the surface. Each terminal part is joined to an external terminal on the top part. a hole penetrating in use vertically formed, and the multilayer portion of the lead and the frame portion overlapping thereby fastening means passing through the container by utilizing the hole of the terminal part stand out outer shape to the surface of the sealed containers to a vacuum And an electrical double layer capacitor characterized in that the top part and the external part are joined.

The electric double layer capacitor according to claim 1 or 2, wherein the container is made of an aluminum laminate and includes an insulating seal for a hole generated by penetration of the fastening means.

3. The electric double layer capacitor according to claim 2, wherein rivets or screws are used as fastening means penetrating the container.

A capacitor body configured by alternately laminating the same number of positive and negative electrode bodies with separators interposed therebetween, and a container sealed with a capacitor body together with a pair of terminal portions and sealed in a vacuum state. a step of creating in the method of manufacturing an electric double layer capacitor, a terminal portion composed of a hole penetrating vertically for joining the external terminal in the center of the seat portion and the frame portion projecting into the frame section and its side comprising Forming a container for housing the capacitor body together with a pair of terminal parts from a material having flexibility that allows the outer shape of the terminal part located inside to be exposed to the surface when the container is sealed in a vacuum state; A step of die-cutting the electrode integrally with the lead portion, a step of collecting the lead portions of a predetermined number of collector electrodes and joining the sheet portions of the terminal portions corresponding to the multilayer portions of the same polarity, and a collector electrode of the positive electrode Negative A step of constructing a capacitor body by assembling a polarizable electrode and a separator between the electrodes, and a step of placing the capacitor body together with a pair of terminal portions in a container and bonding the opening surfaces of the holes of the top portions to the inner surface of the container And a step of immersing the capacitor body in the electrolytic solution, and a step of sealing the inside of the container in a vacuum state while removing the excess electrolytic solution.

A capacitor body configured by alternately laminating the same number of positive and negative electrode bodies with separators interposed therebetween, and a container sealed with a capacitor body together with a pair of terminal portions and sealed in a vacuum state. in the method for manufacturing an electric double layer capacitor comprising the steps of creating a terminal portion composed of a hole penetrating vertically for joining the frame portion and the external terminal to the center, the capacitor body with the terminal portions of the pair Once sealed container for paid to the vacuum state and steps of the outer shape of the terminal portions located therein is made from a material having a flexibility enough to stand out on the surface, the same number of positive electrode and negative electrode body between them A process of forming a capacitor body by alternately laminating with separators interposed therebetween, and a capacitor body together with a pair of terminal portions in a container, and the opening surface of the hole of the terminal portion on the corresponding layered portion of the lead portion A process of immersing the capacitor body in the electrolyte, a process of sealing the inside of the container to a vacuum while removing the excess electrolyte, and a hole in the terminal part where the outer shape is exposed on the surface of the sealed container characterized by comprising the step of bonding and between the frame portion and the external terminals of the multilayer portion of the lead and the frame portion overlapping thereto, a by fastening means penetrating the vessel Te electric double layer capacitor Manufacturing method.