JP5095931B2 - Capacitor - Google Patents
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- JP5095931B2 JP5095931B2 JP2005263938A JP2005263938A JP5095931B2 JP 5095931 B2 JP5095931 B2 JP 5095931B2 JP 2005263938 A JP2005263938 A JP 2005263938A JP 2005263938 A JP2005263938 A JP 2005263938A JP 5095931 B2 JP5095931 B2 JP 5095931B2
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- 239000003990 capacitor Substances 0.000 title claims description 117
- 229920005989 resin Polymers 0.000 claims description 79
- 239000011347 resin Substances 0.000 claims description 79
- 239000005001 laminate film Substances 0.000 claims description 63
- 230000002093 peripheral effect Effects 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 230000004927 fusion Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 239000004793 Polystyrene Substances 0.000 claims description 4
- 229920005672 polyolefin resin Polymers 0.000 claims description 4
- 229920002223 polystyrene Polymers 0.000 claims description 4
- 229920001083 polybutene Polymers 0.000 claims description 2
- 239000011888 foil Substances 0.000 description 28
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 238000003466 welding Methods 0.000 description 7
- -1 polypropylene Polymers 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- 239000000758 substrate Substances 0.000 description 3
- 230000004931 aggregating effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 229920006015 heat resistant resin Polymers 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
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
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- Sealing Battery Cases Or Jackets (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Description
本発明は、コンデンサに関し、特にラミネートフィルムによる外装を施したコンデンサであって、コンデンサ内部のガスを外部へ放出可能な圧力弁構造を備えたコンデンサに関する。 The present invention relates to a capacitor, and more particularly, to a capacitor having a laminated film and having a pressure valve structure capable of releasing gas inside the capacitor to the outside.
従来、ラミネートフィルムで外装したコンデンサとしては、電解コンデンサ、電気２重層コンデンサなどがあり、小形・薄型化されたコンデンサとしては、金属フィルムとこの両面にラミネートした合成樹脂フィルムとからなる複合フィルム（以下ラミネートフィルムと称す）からなる外装体でコンデンサ素子１を覆うとともに、外装体の周縁部を熱融着して密封し、かつコンデンサ素子より導出した引き出しリード３を外装体の熱融着部で挟持して外部に取り出したコンデンサが実用化されるようになってきた。
このようなコンデンサでは、外装体となるラミネートフィルムは、金属ケースに比べて機械的強度が低く、コンデンサ内部にガスが発生し、このガス圧によりラミネートフィルムの一部が破損して、内部ガスとともに電解液がコンデンサ外部に飛散して周囲の各種電子部品を損傷する恐れがあった。
Conventionally, there are electrolytic capacitors, electric double-layer capacitors, etc., as capacitors externally covered with a laminate film, and as compact and thin capacitors, a composite film comprising a metal film and a synthetic resin film laminated on both sides (hereinafter referred to as a composite film) The capacitor element 1 is covered with an exterior body made of a laminate film), the periphery of the exterior body is heat-sealed and sealed, and the lead 3 led out from the capacitor element is sandwiched between the heat-sealed portions of the exterior body As a result, capacitors taken out to the outside have come into practical use.
In such a capacitor, the laminate film as the exterior body has a lower mechanical strength than the metal case, and gas is generated inside the capacitor. This gas pressure causes a part of the laminate film to be damaged, together with the internal gas. There was a risk that the electrolyte would splash outside the capacitor and damage various electronic components.
そこで、熱融着したラミネートフィルムの周縁部の一部に狭い封止部を設け、コンデンサ内部に発生したガスの圧力により、弱点部となるこの狭い封止部が開放されて、内部に充満したガスが放出され、爆発を未然に防ぐ構造が提案されている（特許文献１）。 Therefore, a narrow sealing part is provided in a part of the peripheral part of the heat-sealed laminate film, and the narrow sealing part which becomes a weak point part is opened by the pressure of the gas generated inside the capacitor, and the inside is filled. A structure has been proposed in which gas is released and explosion is prevented (Patent Document 1).
しかしながら、ラミネートフィルムによって外装されたコンデンサは、ラミネートフィルムの機械的強度が低いため、コンデンサの内部にガスが発生すると膨れやすい傾向にあり、コンデンサが大きく膨らみ、周囲の電子部品などと接触してラミネートフィルムが損傷し、この損傷部から内部ガスとともに電解液が外部に放出されてしまう問題や、ラミネートフィルムの膨れによって基板と外部端子との接続部に機械的ストレスが加わり接続部が損傷するなどの可能性があり、ラミネートフィルムによって外装されたコンデンサにおいては、内部ガス圧が低い状態でも内部ガスを外部に放出する圧力弁が求められている。
しかしながら特許文献１に記載のコンデンサでは、コンデンサの内部ガス圧が低い状態でも開放させるためには、狭い封止部を更に狭くしなければならず、この更に狭くした封止部の寸法を制御することは難しく、コンデンサによって、圧力弁となる狭い封止部の動作圧にバラツキがでるなどの問題があった。
However, capacitors covered with a laminate film tend to swell when gas is generated inside the capacitor because of the low mechanical strength of the laminate film, and the capacitor swells greatly and comes into contact with surrounding electronic components and laminates. The film may be damaged, and the electrolyte may be discharged to the outside along with the internal gas from the damaged part, and the connecting part may be damaged due to mechanical stress applied to the connecting part between the substrate and the external terminal due to the swelling of the laminate film. There is a possibility, and in a capacitor covered with a laminate film, there is a demand for a pressure valve that releases the internal gas to the outside even when the internal gas pressure is low.
However, in the capacitor described in Patent Document 1, in order to open even when the internal gas pressure of the capacitor is low, the narrow sealing portion must be further narrowed, and the size of the narrower sealing portion is controlled. This is difficult, and there is a problem that the operating pressure of the narrow sealing portion that becomes a pressure valve varies depending on the capacitor.
そこで、本発明は、ラミネートフィルムによって外装されたコンデンサにおいて、低い内部圧力であっても確実に動作する信頼性の高い圧力弁を備えたコンデンサを実現することを目的としている。 Accordingly, an object of the present invention is to realize a capacitor having a highly reliable pressure valve that operates reliably even at a low internal pressure in a capacitor covered with a laminate film.
そこで、上記の課題を解決した本発明のコンデンサは、
コンデンサ素子より導出された陽極端子及び陰極端子を有し、前記コンデンサ素子を金属層と該金属層の両面に絶縁樹脂層を備えたラミネートフィルムで、前記陽極端子及び陰極端子が外側に延出するように収納するとともに、該ラミネートフィルムの外周部を熱融着して封止したコンデンサであって、
前記熱融着された外周部の一部のラミネートフィルム間に、凝集剥離性を有する樹脂フィルムが熱融着により介在されたことを特徴としている。
これによると、凝集剥離性を有する樹脂フィルムは、ラミネートフィルムの界面と強固に熱融着されているため、コンデンサ内部におけるガス発生などによりコンデンサの内圧が上昇した際に、樹脂フィルム自体が凝集剥離し、コンデンサ内部のガスが外部に放出される。従って、この樹脂フィルム自体の凝集剥離強度を変えたり、樹脂フィルムの介在面積を変えたりすることで、圧力弁となる樹脂フィルムを凝集剥離させるコンデンサの内部圧力を所望の圧力に設定することが可能となり、コンデンサの内部圧力が低い状態であっても確実に動作させることができる。
Therefore, the capacitor of the present invention that has solved the above problems is
A laminated film having an anode terminal and a cathode terminal derived from a capacitor element, the capacitor element being a metal film and an insulating resin layer on both surfaces of the metal layer, and the anode terminal and the cathode terminal extending outward. And a capacitor in which the outer peripheral portion of the laminate film is heat-sealed and sealed,
It is characterized in that a resin film having a cohesive peel property is interposed by heat fusion between some laminated films of the heat-sealed outer peripheral portion.
According to this, since the resin film with cohesive peelability is firmly heat-sealed with the interface of the laminate film, when the internal pressure of the capacitor rises due to gas generation inside the capacitor, the resin film itself is cohesive peeled Then, the gas inside the capacitor is released to the outside. Therefore, by changing the cohesive peel strength of the resin film itself or by changing the intervening area of the resin film, it is possible to set the internal pressure of the capacitor that coheses and peels the resin film that becomes the pressure valve to a desired pressure Therefore, even if the internal pressure of the capacitor is low, it can be operated reliably.
また、前記樹脂フィルムは、オレフィン系樹脂と、ポリスチレン又はポリブデンとの混合樹脂フィルムであることを特徴としている。
これによると、オレフィン系樹脂に混合されたポリスチレン又はポリブデンによって凝集剥離性を高めることができる。
The resin film is a mixed resin film of an olefin resin and polystyrene or polybuden.
According to this, the cohesive peelability can be enhanced by polystyrene or polybudene mixed in the olefin resin.
また、前記樹脂フィルム介在領域の凝集剥離強度は、ラミネートフィルムの熱融着部の強度に対し、１０〜２８％に相当することを特徴としている。
これによると、コンデンサ内部の圧力が低い状態でも、確実に動作し、信頼性の高いコンデンサを提供できる。
Further, the cohesive peel strength of the resin film intervening region corresponds to 10 to 28% relative to the strength of the heat-sealed portion of the laminate film.
According to this, even if the pressure inside the capacitor is low, it can operate reliably and provide a highly reliable capacitor.
また、前記樹脂フィルムは、ラミネートフィルムより外側に延出するように介在されたことを特徴としている。
これによると、前記樹脂フィルムの有無を目視することができ、未挿入品の見分けが容易である。
Further, the resin film is characterized by being interposed so as to extend outward from the laminate film.
According to this, the presence or absence of the resin film can be visually observed, and the uninserted product can be easily distinguished.
また、前記樹脂フィルムは、ラミネートフィルムの外周部のうち、陽極端子及び陰極端子の近傍に配置されたことを特徴としている。
これによると、陽極端子及び陰極端子によってその導出付近の熱融着部は、他の熱融着部分に比べて強度が高く、輸送時などに外部からの機械的ストレスによって折り曲げられるなどがなく、この陽極端子及び陰極端子の近傍に配置された樹脂フィルムへ機械的ストレスが加わることを低減できる。
Further, the resin film is characterized in that it is disposed in the vicinity of the anode terminal and the cathode terminal in the outer peripheral portion of the laminate film.
According to this, the heat fusion part in the vicinity of its lead-out by the anode terminal and the cathode terminal is higher in strength than other heat fusion parts, and it is not bent by mechanical stress from outside during transportation, It can reduce that mechanical stress is added to the resin film arrange | positioned in the vicinity of this anode terminal and a cathode terminal.
また、本発明のコンデンサの製造方法は、
コンデンサ素子より導出された陽極端子及び陰極端子を有し、前記コンデンサ素子を金属層と該金属層の両面に絶縁樹脂層を備えたラミネートフィルムで、前記陽極端子及び陰極端子が外側に延出するように収納するとともに、該ラミネートフィルムの外周部を熱融着して封止するコンデンサの製造方法であって、
前記熱融着するラミネートフィルムの外周部に凝集剥離性を有する樹脂フィルムを配置し、ラミネートフィルムの外周部の熱融着と同時に前記樹脂フィルムを熱融着してラミネートフィルム間に介在させたことを特徴としている。
これによると、所定の圧力に対して、低い圧力であっても確実に動作させることができるとともに、ラミネートフィルムの熱融着状態に左右されることなく、常に一定の圧力で動作させる圧力弁となる凝集剥離性を有する樹脂フィルムを所望の場所に容易に且つ確実に形成できる。
In addition, the method for manufacturing the capacitor of the present invention includes:
A laminated film having an anode terminal and a cathode terminal derived from a capacitor element, the capacitor element being a metal film and an insulating resin layer on both surfaces of the metal layer, and the anode terminal and the cathode terminal extending outward. And a capacitor manufacturing method in which the outer peripheral portion of the laminate film is heat-sealed and sealed,
A resin film having a cohesive peel property is arranged on the outer peripheral portion of the laminate film to be heat-sealed, and the resin film is heat-sealed at the same time as the outer peripheral portion of the laminate film and interposed between the laminate films. It is characterized by.
According to this, a pressure valve that can be reliably operated even at a low pressure with respect to a predetermined pressure, and is always operated at a constant pressure without being influenced by the heat-sealed state of the laminate film, The resin film having cohesive peelability can be easily and reliably formed at a desired location.
本発明によれば、ラミネートフィルムによって外装されたコンデンサにおいて、低い内部圧力であっても確実に動作し、且つその動作圧力もコンデンサ毎にバラツキの少ない信頼性の高いコンデンサを実現できる。 According to the present invention, it is possible to realize a highly reliable capacitor that operates reliably even at a low internal pressure in a capacitor covered with a laminate film and that has a small variation in operating pressure among capacitors.
本発明に係るラミネートフィルムで外装したコンデンサを実施するための最良の形態を実施例に基づいて以下に説明する。 BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out a capacitor covered with a laminate film according to the present invention will be described below based on examples.
本発明の実施例を図面に基づいて説明すると、先ず図１は、実施例における電解コンデンサを示す分解斜視図であり、図２は、電解コンデンサの製造工程を示す側断面図である。なお、本実施例では、コンデンサとして電解コンデンサを例示する。 An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is an exploded perspective view showing an electrolytic capacitor in the embodiment, and FIG. 2 is a side sectional view showing a manufacturing process of the electrolytic capacitor. In this embodiment, an electrolytic capacitor is exemplified as the capacitor.
図１の符号１は、本発明の適用された電解コンデンサであり、この電解コンデンサ１は、コンデンサ素子２と陰極端子及び陽極端子とラミネートフィルム４とを有している。コンデンサ素子２は、陽極箔及び陰極箔で構成される電極箔５が、セパレータを挟んで交互に積層されて形成されており、陽極箔及び陰極箔の各々に設けられたタブ部６と外方に突出する外部端子３が接続された陽極端子及び陰極端子がコンデンサ素子より導出されている。 Reference numeral 1 in FIG. 1 denotes an electrolytic capacitor to which the present invention is applied. The electrolytic capacitor 1 includes a capacitor element 2, a cathode terminal, an anode terminal, and a laminate film 4. The capacitor element 2 is formed by alternately laminating electrode foils 5 composed of an anode foil and a cathode foil, with a separator interposed therebetween, and a tab portion 6 provided on each of the anode foil and the cathode foil and an outer side. The anode terminal and the cathode terminal to which the external terminal 3 protruding from the terminal is connected are derived from the capacitor element.
このタブ部６は、アルミニウムからなる帯状部材をステッチ、冷間圧接、超音波溶接、レーザ溶接、摩擦攪拌溶接などの手段により陽極箔及び陰極箔にそれぞれ接続されたものや、陽極箔及び陰極箔の一部を突出させてタブ部とすることもできる。本実施例では、陽極箔のタブ部６は、冷間圧接にて接続されたアルミニウムからなる帯状部材を用い、陰極箔のタブ部６は、陰極箔の一部を突出させたものを用いている。 The tab portion 6 is formed by connecting a strip-shaped member made of aluminum to the anode foil and the cathode foil by means of stitching, cold welding, ultrasonic welding, laser welding, friction stir welding, or the like. It is also possible to project a part of the tab to form a tab portion. In this embodiment, the tab portion 6 of the anode foil uses a strip-like member made of aluminum connected by cold welding, and the tab portion 6 of the cathode foil uses a portion in which a part of the cathode foil is projected. Yes.
図１に示すように、コンデンサ素子２のタブ部６は、陽極箔から突出されたタブ部６と陰極箔から突出されたタブ部６とが各々束ねられており、各々のタブ部６の先端部には、外部端子３が接続されるようになっている。この２つの外部端子３は、中間部がポリプロピレンなどの絶縁樹脂層７で囲繞され、この絶縁樹脂層７によって２つの外部端子３が互いに連結されている。以下、本実施例において、タブ部６に接続される外部端子３の端部を内端部８、他方側を先端部９と称する。 As shown in FIG. 1, the tab portion 6 of the capacitor element 2 is formed by bundling a tab portion 6 protruding from the anode foil and a tab portion 6 protruding from the cathode foil, and the tip of each tab portion 6. The external terminal 3 is connected to the part. The two external terminals 3 are surrounded by an insulating resin layer 7 such as polypropylene, and the two external terminals 3 are connected to each other by the insulating resin layer 7. Hereinafter, in this embodiment, the end portion of the external terminal 3 connected to the tab portion 6 is referred to as an inner end portion 8, and the other side is referred to as a distal end portion 9.
このコンデンサ素子２は、ラミネートフィルム４によって包み込んで収納され、重ね合わされたラミネートフィルムの外周部を熱融着して密封状に外装されるようになっている。コンデンサ素子２を外装する際には、１枚のラミネートフィルム４がコンデンサ素子２を挟み込むように折り曲げられ、ラミネートフィルム４のエンボス部にコンデンサ素子が収納されるとともに、重ね合わされたラミネートフィルム４の外周部を熱融着させるようになっている。 The capacitor element 2 is wrapped and accommodated by a laminate film 4, and the outer peripheral portion of the laminated laminate film is heat-sealed to be hermetically sealed. When the capacitor element 2 is packaged, one laminate film 4 is bent so as to sandwich the capacitor element 2, and the capacitor element is stored in the embossed portion of the laminate film 4, and the outer periphery of the laminated laminate film 4 is overlapped The parts are heat-sealed.
更に詳述すると、ラミネートフィルム４は、耐熱性樹脂やアルミ箔や熱融着性樹脂によって複数の層が形成されており、外側の層には耐熱性樹脂が配置され、中心の層にはアルミ箔が配置され、内側の層には熱融着性樹脂の層が配置されている。本実施例では、外側の層にはナイロンを用い、中心の層にはアルミ箔が配置され、内側の層には、ポリプロピレンが配置されている。そして、ラミネートフィルム４を折り曲げ、一部に外部端子３の中間部に設けられた絶縁樹脂層７を挟むように熱融着性樹脂の層同士を当接させて重ね、この重ねた部位に熱を加えると、熱融着性樹脂同士が融けて熱融着され、コンデンサ素子２をラミネートフィルム４の内部に密封できるようになっている。 More specifically, the laminate film 4 has a plurality of layers formed of heat-resistant resin, aluminum foil, or heat-sealable resin, heat-resistant resin is disposed on the outer layer, and aluminum is disposed on the center layer. A foil is disposed, and a layer of heat-fusible resin is disposed on the inner layer. In this embodiment, nylon is used for the outer layer, aluminum foil is arranged for the center layer, and polypropylene is arranged for the inner layer. Then, the laminate film 4 is bent, and the layers of the heat-fusible resin are brought into contact with each other so as to sandwich the insulating resin layer 7 provided at the intermediate portion of the external terminal 3 in part, and heat is applied to the overlapped portion. Is added, the heat-fusible resin is melted and heat-sealed, so that the capacitor element 2 can be sealed inside the laminate film 4.
このラミネートフィルム４の重ねられて熱融着される外周部の一部には、凝集剥離性を有する樹脂フィルム１０が配置され、熱融着によりラミネートフィルム間に介在される。本実施例では、外部端子３の中間部に形成された絶縁樹脂層７を２枚の樹脂フィルム１０、１０’によって挟むように介在することで、陽極端子及び陰極端子の近傍に配置される。なお、この樹脂フィルム１０は、ラミネートフィルムより外側に延出するようにしてもよい。 A resin film 10 having a cohesive peel property is disposed on a part of the outer peripheral portion where the laminate film 4 is overlapped and heat-sealed, and is interposed between the laminate films by heat-sealing. In the present embodiment, the insulating resin layer 7 formed in the intermediate portion of the external terminal 3 is interposed between the two resin films 10 and 10 ′ so as to be disposed in the vicinity of the anode terminal and the cathode terminal. The resin film 10 may extend outward from the laminate film.
この凝集剥離性を有する樹脂フィルム１０は、ポリエチレン、ポリプロピレンなどのオレフィン系樹脂に、ポリスチレン又はポリブデンを混合した樹脂フィルム１０からなり、さらに、ラミネートフィルム４の内側の層の樹脂及び絶縁樹脂層７にポリプロピレンを用いているため、密着性を高めるため、前記樹脂フィルム１０に更にポリプロピレンを混合した樹脂フィルム１０を用いている。 The resin film 10 having a cohesive peelability is composed of a resin film 10 in which polystyrene or polybutene is mixed with an olefin resin such as polyethylene or polypropylene, and the resin and insulating resin layer 7 on the inner side of the laminate film 4 are further formed. Since polypropylene is used, a resin film 10 in which polypropylene is further mixed with the resin film 10 is used in order to improve adhesion.
この凝集剥離性を有する樹脂フィルム１０は、ラミネートフィルム４の内側の層及び絶縁樹脂層７と熱融着により強固に密封され、コンデンサ内部にガス発生した際には、強度が低い弱点部となる樹脂フィルム１０自体が凝集剥離され、コンデンサ内部と外部が貫通して内部ガスが放出されることになる。
従って、この樹脂フィルム１０自体の凝集剥離強度を変えたり、樹脂フィルム１０の介在面積を変えたりすることで、圧力弁となる樹脂フィルム１０を凝集剥離させるコンデンサの内部圧力を所望の圧力に設定することが可能となり、コンデンサの内部圧力が低い状態であっても確実に動作させることができる。
The resin film 10 having a cohesive peelability is tightly sealed by heat fusion with the inner layer of the laminate film 4 and the insulating resin layer 7, and when gas is generated inside the capacitor, it becomes a weak spot with low strength. The resin film 10 itself is agglomerated and peeled off, and the inside and outside of the capacitor pass through to release the internal gas.
Therefore, the internal pressure of the capacitor for aggregating and peeling the resin film 10 serving as a pressure valve is set to a desired pressure by changing the cohesive peel strength of the resin film 10 itself or changing the intervening area of the resin film 10. Therefore, even if the internal pressure of the capacitor is low, it can be reliably operated.
また、前記樹脂フィルム１０の凝集剥離強度は、ラミネートフィルム４の熱融着部の強度に対し、１０〜２８％に相当させるように設定することで、コンデンサ内部の圧力が低い状態でも、確実に動作し、信頼性の高いコンデンサを提供できる。 Further, the cohesive peel strength of the resin film 10 is set so as to correspond to 10 to 28% of the strength of the heat-sealed portion of the laminate film 4, so that even when the pressure inside the capacitor is low, it is ensured. It can operate and provide a highly reliable capacitor.
次に、電解コンデンサ１の製造工程について詳述すると、先ず図２（ａ）に示すように、電極箔５を積層させ、各々の電極箔５に取り付けられたタブ部６を重ね合わせる。このとき重ね合わせたタブ部６は、積層された電極箔５の上面側か下面側のいずれか一方側と面一になるように束ねられる。尚、本実施例では、積層された電極箔５の下面側と面一になるようにタブ部６を寄せて束ねている。 Next, the manufacturing process of the electrolytic capacitor 1 will be described in detail. First, as shown in FIG. 2A, the electrode foils 5 are laminated, and the tab portions 6 attached to the respective electrode foils 5 are overlapped. At this time, the overlapped tab portions 6 are bundled so as to be flush with either the upper surface side or the lower surface side of the stacked electrode foils 5. In this embodiment, the tab portions 6 are bundled together so as to be flush with the lower surface side of the laminated electrode foils 5.
図２（ｂ）に示すように、外部端子３の内端部８を束ねられたタブ部６に下方側から当接させ、この当接部を冷間圧接によって上下方向から押圧してタブ部６と外部端子３の内端部８を接続固定する。なお、この冷間圧接時には、束ねられたタブ部６の下方側を基台（図示せず）に載せ、束ねられたタブ部６の上方側に接続用の接続チップを配して接続を行っている。このように、接続用の接続チップを束ねられたタブ部６の上方側に配置することで、接続時に変形量が大きくバリが生じやすい接続ポイントが前記タブ部６の上方側に形成され、後述する外部端子及びタブ部をＬ字状に折り曲げた際には、接続ポイントはコンデンサ素子側に配置されるため、接続ポイントのバリによるラミネートフィルムの損傷及びこれによる短絡などの不具合が防止される。そして、図２（ｃ）に示すように、タブ部６における圧接部位よりも先端側のタブ部６を切断し、タブ部６の先端部及び外部端子３の内端部８が、Ｌ字形状になるように折り曲げる。このとき外部端子３の先端部９は、積層された電極箔５の下面側と面一になる。 As shown in FIG. 2B, the inner end portion 8 of the external terminal 3 is brought into contact with the bundled tab portion 6 from the lower side, and the contact portion is pressed from above and below by cold pressure welding to thereby form the tab portion. 6 and the inner end 8 of the external terminal 3 are connected and fixed. During this cold welding, the lower side of the bundled tab portions 6 is placed on a base (not shown), and a connection chip for connection is arranged on the upper side of the bundled tab portions 6 for connection. ing. As described above, by arranging the connection chip for connection above the bundled tab portion 6, a connection point having a large deformation amount and easily generating burr at the time of connection is formed on the upper side of the tab portion 6, which will be described later. When the external terminal and the tab portion to be bent are bent in an L-shape, the connection point is arranged on the capacitor element side, so that problems such as damage to the laminate film due to burrs at the connection point and short circuit due to this are prevented. Then, as shown in FIG. 2 (c), the tab portion 6 on the tip side of the pressure contact portion in the tab portion 6 is cut, and the tip portion of the tab portion 6 and the inner end portion 8 of the external terminal 3 are L-shaped. Bend it so that At this time, the tip 9 of the external terminal 3 is flush with the lower surface of the laminated electrode foil 5.
次に、ラミネートフィルム４における外部端子３の絶縁樹脂層７が配置される領域に、樹脂フィルム１０、１０’を配置し、図２（ｄ）に示すように、コンデンサ素子２をラミネートフィルム４で挟み込むように覆い、外部端子３の絶縁樹脂層７を前記樹脂フィルム１０にて挟み、外部端子３の先端部９を、ラミネートフィルム４から突出させて配置する。ラミネートフィルム４の重ねられた部位の所定範囲Ｄを上下方向から熱を加えならながら押圧して熱融着させる。なお、前記樹脂フィルム１０、１０’は、ラミネートフィルムに熱融着などにより位置ずれしないように予め仮固定してもよい。 Next, resin films 10 and 10 ′ are arranged in a region where the insulating resin layer 7 of the external terminal 3 is arranged in the laminate film 4, and the capacitor element 2 is made of the laminate film 4 as shown in FIG. The insulating resin layer 7 of the external terminal 3 is sandwiched between the resin films 10 and the tip 9 of the external terminal 3 is disposed so as to protrude from the laminate film 4. The predetermined range D of the overlapped portion of the laminate film 4 is pressed and thermally fused while applying heat from above and below. The resin films 10 and 10 'may be temporarily fixed to the laminate film so as not to be misaligned by heat fusion or the like.
図２（ｄ）に示すように、所定範囲Ｄには、外部端子３を囲繞する絶縁樹脂層７に加えて、樹脂フィルム１０、１０’が配置され、下面側の樹脂フィルム１０は、所定範囲Ｄよりも幅広になるように、内部側と外部側に延在され、そのため、外部端子３の内端部８の折れ曲がった根本部及び内部タブ６の折れ曲がった根本部分が前記樹脂フィルム１０で覆われるようになり、また、上面側の樹脂フィルム１０’もコンデンサ素子側に延在することで、外部端子３の内端部８と内部タブ６との接続部が覆われるようになり、ラミネートフィルム４の熱融着性樹脂が熱融着時に融けて、アルミ箔がラミネートフィルム４の内部側に露出しても、アルミ箔が外部端子３の内端部８、内部タブ６や外部端子３の内端部８と内部タブ６との接続部と触れて短絡することが避けられる。また上面側の樹脂フィルム１０’は、さらに切断された先端側のタブ部６の切断部を覆うように延在されているため、切断部のバリなどが生じた場合であってもラミネートフィルム４は前記樹脂フィルム１０’により保護される。 As shown in FIG. 2D, in the predetermined range D, in addition to the insulating resin layer 7 surrounding the external terminal 3, resin films 10 and 10 ′ are arranged, and the resin film 10 on the lower surface side has a predetermined range. It extends to the inner side and the outer side so as to be wider than D. Therefore, the bent root portion of the inner end 8 of the external terminal 3 and the bent root portion of the inner tab 6 are covered with the resin film 10. Further, the resin film 10 ′ on the upper surface side also extends toward the capacitor element side, so that the connection portion between the inner end 8 of the external terminal 3 and the internal tab 6 is covered, and the laminate film 4, even if the aluminum foil is exposed to the inner side of the laminate film 4, the aluminum foil is exposed to the inner end portion 8 of the external terminal 3, the internal tab 6, and the external terminal 3. Touching the connection between the inner end 8 and the inner tab 6 It is avoided to be short-circuited. Further, since the resin film 10 ′ on the upper surface side is extended so as to cover the cut portion of the tab portion 6 on the front end side that has been further cut, the laminate film 4 can be used even when burrs or the like of the cut portion occur. Is protected by the resin film 10 '.
この様に、熱融着されたラミネートフィルム４の外周部の一部に凝集剥離性を有する樹脂フィルム１０を介在させることで、所定の圧力に対して、低い圧力であっても確実に動作させることができるとともに、ラミネートフィルムの熱融着状態に左右されることなく、常に一定の圧力で動作させる圧力弁機能となる凝集剥離性を有する樹脂フィルム１０を所望の場所に容易に且つ確実に形成できる。 In this manner, by interposing the resin film 10 having a cohesive peel property on a part of the outer peripheral portion of the heat-sealed laminate film 4, the operation is surely performed even at a low pressure with respect to a predetermined pressure. In addition, the resin film 10 having a cohesive peel property that is a pressure valve function that always operates at a constant pressure can be easily and surely formed at a desired location without being influenced by the heat-sealed state of the laminate film. it can.
また図２（ｄ）に示すように、コンデンサ素子２のタブ部６と外部端子３とをＬ字状に折り曲げて接続したので、電解コンデンサ１の所定寸法Ｌが短くなるように形成でき、電解コンデンサ１の小形化が図れるようになっている。 Further, as shown in FIG. 2 (d), since the tab portion 6 of the capacitor element 2 and the external terminal 3 are bent and connected in an L shape, the electrolytic capacitor 1 can be formed so that the predetermined dimension L is shortened. The capacitor 1 can be miniaturized.
更に図２（ｄ）に示すように、外部端子３の先端部９が、積層された電極箔５の下面側と面一になっていることで、この電解コンデンサ１の下面を電子部品の基板に当接させたときに、外部端子３の先端部９が基板上の配線に接続し易くなる。そのため電子部品における電解コンデンサ１が占める容積を小さくできるので、電解コンデンサ１が搭載される電子部品の小型化が可能になる。 Further, as shown in FIG. 2 (d), the tip 9 of the external terminal 3 is flush with the bottom surface of the laminated electrode foil 5, so that the bottom surface of the electrolytic capacitor 1 is the substrate of the electronic component. When it is brought into contact with the external terminal 3, the tip 9 of the external terminal 3 is easily connected to the wiring on the substrate. Therefore, since the volume occupied by the electrolytic capacitor 1 in the electronic component can be reduced, the electronic component on which the electrolytic capacitor 1 is mounted can be downsized.
以上、本発明の実施例を図面により説明してきたが、具体的な構成はこれら実施例に限られるものではなく、本発明の要旨を逸脱しない範囲における変更や追加があっても本発明に含まれる。例えば、図３に示すように、凝集性の樹脂フィルム１０は、ラミネートフィルム４の熱融着される外周部のうち、実施例の様にコンデンサの陽極端子及び陰極端子の介在領域ではなく、コンデンサ素子の側面部に配置することもできる。この場合、この凝集剥離性を有する樹脂フィルム１０は、重ねられた各々のラミネートフィルム４の内側の層７と熱融着により強固に密封され、コンデンサ内部にガス発生した際には、強度が低い弱点部となる樹脂フィルム１０自体が凝集剥離され、コンデンサ内部と外部が貫通して内部ガスが放出されることになる。従って、この樹脂フィルム１０自体の凝集剥離強度を変えたり、樹脂フィルム１０の介在面積を変えたりすることで、圧力弁となる樹脂フィルム１０を凝集剥離させるコンデンサの内部圧力を所望の圧力に設定することが可能となり、コンデンサの内部圧力が低い状態であっても確実に動作させることができる。また、前記樹脂フィルム１０は、矩形であったが、これに限らず、三角形、台形、円形、楕円形、長方形にすることもできる。 Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is. For example, as shown in FIG. 3, the cohesive resin film 10 is not a capacitor intervening region between the anode terminal and the cathode terminal of the outer peripheral portion of the laminate film 4 to be heat-sealed, as in the embodiment. It can also be placed on the side of the element. In this case, the resin film 10 having the cohesive peelability is tightly sealed by heat fusion with the inner layer 7 of each laminated film 4 so that the strength is low when gas is generated inside the capacitor. The resin film 10 itself that becomes the weak point portion is agglomerated and peeled off, and the inside and outside of the capacitor pass through to release the internal gas. Therefore, the internal pressure of the capacitor for aggregating and peeling the resin film 10 serving as a pressure valve is set to a desired pressure by changing the cohesive peel strength of the resin film 10 itself or changing the intervening area of the resin film 10. Therefore, even if the internal pressure of the capacitor is low, it can be reliably operated. Moreover, although the said resin film 10 was a rectangle, not only this but a triangle, trapezoid, circle, an ellipse, and a rectangle can also be made.
また、実施例では、コンデンサ素子として、陽極箔と陰極箔をセパレータを介して積層したコンデンサ素子を例示したが、これに限らず陽極箔と陰極箔をセパレータを介して巻回するコンデンサ素子を用いてもよい。また、コンデンサ素子より導出された陰極端子及び陽極端子は、それぞれ外部端子の先端部をコンデンサ素子側に配置して内部タブと接続し、その後Ｌ字状に折り曲げたものを例示したが、これに限らず、外部端子の先端部を、コンデンサ外方に配置して内部タブと接続したものを用いても良い。 Further, in the examples, as the capacitor element, a capacitor element in which an anode foil and a cathode foil are laminated via a separator is illustrated, but the present invention is not limited thereto, and a capacitor element in which the anode foil and the cathode foil are wound via a separator is used. May be. In addition, the cathode terminal and the anode terminal derived from the capacitor element are illustrated by locating the tip of the external terminal on the capacitor element side, connecting to the internal tab, and then bending in an L shape. Not limited to this, the tip of the external terminal disposed outside the capacitor and connected to the internal tab may be used.
また、実施例では、ラミネートフィルムは、コンデンサ素子２を挟み込むように１枚のラミネートフィルムを折り曲げて外装するものを示したが、これに限らず、２枚のラミネートフィルムにてコンデンサ素子を挟み込むこともできる。また、予め筒状に形成したラミネートフィルムにコンデンサ素子を収納することもできる。また、実施例では、ラミネートフィルムの一方の面にコンデンサ素子を収納するエンボス部が形成されているが、両面に形成しても良いし、またエンボス部を形成しなくても良い。 Further, in the examples, the laminated film has been shown in which one laminated film is folded and packaged so that the capacitor element 2 is sandwiched. However, the present invention is not limited to this, and the capacitor element is sandwiched between two laminated films. You can also. Further, the capacitor element can be accommodated in a laminate film formed in a cylindrical shape in advance. In the embodiment, the embossed portion for accommodating the capacitor element is formed on one surface of the laminate film. However, the embossed portion may be formed on both surfaces or may not be formed.
また、実施例では、コンデンサとして電解コンデンサを例示して説明してきたが、これに限らず、電気２重層コンデンサ、電気化学キャパシタなど、ラミネートフィルムで外装する各種コンデンサ、キャパシタに適用でき、更には、電池にも適用できる。 In the examples, the electrolytic capacitor has been exemplified and described. However, the present invention is not limited to this, and can be applied to various capacitors and capacitors covered with a laminate film, such as an electric double layer capacitor and an electrochemical capacitor. It can also be applied to batteries.
１ 電解コンデンサ
２ コンデンサ素子
３ 外部端子
４ ラミネートフィルム
５ 電極箔
６ タブ部
７ 絶縁樹脂層
８ 内端部
９ 先端部
１０ 樹脂フィルム
DESCRIPTION OF SYMBOLS 1 Electrolytic capacitor 2 Capacitor element 3 External terminal 4 Laminate film 5 Electrode foil 6 Tab part 7 Insulating resin layer 8 Inner end part 9 End part 10 Resin film
Claims (6)
前記熱融着された外周部の一部のラミネートフィルム間に、凝集剥離性を有する樹脂フィルムが熱融着により介在され、
これにより、凝集剥離性を有する樹脂フィルムは、ラミネートフィルムの界面と強固に熱融着されているため、コンデンサ内部におけるガス発生によりコンデンサの内圧が上昇した際に、樹脂フィルム自体が凝集剥離し、コンデンサ内部のガスが外部に放出されるコンデンサ。 A laminated film having an anode terminal and a cathode terminal derived from a capacitor element, the capacitor element being a metal film and an insulating resin layer on both surfaces of the metal layer, and the anode terminal and the cathode terminal extending outward. And a capacitor in which the outer peripheral portion of the laminate film is heat-sealed and sealed,
A resin film having a cohesive peel property is interposed by heat fusion between some of the laminated films on the outer peripheral portion that are heat-sealed ,
As a result, the resin film having a cohesive peel property is firmly heat-sealed with the interface of the laminate film, so when the internal pressure of the capacitor is increased due to gas generation inside the capacitor, the resin film itself is cohesive and peeled, A capacitor in which the gas inside the capacitor is released .
前記熱融着するラミネートフィルムの外周部の一部に凝集剥離性を有する樹脂フィルムを配置し、ラミネートフィルムの外周部の熱融着と同時に前記樹脂フィルムを熱融着してラミネートフィルム間に介在させ、
これにより、凝集剥離性を有する樹脂フィルムは、ラミネートフィルムの界面と強固に熱融着されているため、コンデンサ内部におけるガス発生によりコンデンサの内圧が上昇した際に、樹脂フィルム自体が凝集剥離し、コンデンサ内部のガスが外部に放出されるコンデンサの製造方法。 A laminated film having an anode terminal and a cathode terminal derived from a capacitor element, the capacitor element being a metal film and an insulating resin layer on both surfaces of the metal layer, and the anode terminal and the cathode terminal extending outward. And a capacitor manufacturing method in which the outer peripheral portion of the laminate film is heat-sealed and sealed,
A resin film having a cohesive peel property is arranged on a part of the outer peripheral portion of the laminate film to be heat-sealed, and the resin film is heat-sealed at the same time as the heat-sealing of the outer peripheral portion of the laminate film to be interposed between the laminate films. then,
As a result, the resin film having a cohesive peel property is firmly heat-sealed with the interface of the laminate film, so when the internal pressure of the capacitor is increased due to gas generation inside the capacitor, the resin film itself is cohesive and peeled, A method of manufacturing a capacitor in which the gas inside the capacitor is released to the outside .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005263938A JP5095931B2 (en) | 2005-09-12 | 2005-09-12 | Capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005263938A JP5095931B2 (en) | 2005-09-12 | 2005-09-12 | Capacitor |
Publications (2)
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