JP2014212142A - Power storage device - Google Patents
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- JP2014212142A JP2014212142A JP2013086167A JP2013086167A JP2014212142A JP 2014212142 A JP2014212142 A JP 2014212142A JP 2013086167 A JP2013086167 A JP 2013086167A JP 2013086167 A JP2013086167 A JP 2013086167A JP 2014212142 A JP2014212142 A JP 2014212142A
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- 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
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- 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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Abstract
Description
本発明は、ガス抜き弁を設けた蓄電デバイスに関する。 The present invention relates to an electricity storage device provided with a gas vent valve.
従来、コンデンサ等の蓄電デバイスの内部で水素等のガスが発生し、その内部圧力が上昇した場合に備え、コンデンサの封口板に防爆弁を設置したものがある。コンデンサにおいては、長期間の使用や使用環境等により、コンデンサ素子に含浸された電解液が化学反応を起こして外装ケース内にガスが発生することがある。このガスは、主に水分が分解されることによる水素ガスや、電解液が高温になって気化されることによるガスであり、このガスにより外装ケースの内圧が上昇すると、外装ケースが破損することがある。そのため、コンデンサ内部が一定の圧力となった場合にこの防爆弁を破裂させ、内部のガスをこの防爆弁より外部に放出することで、コンデンサ自体の破裂を防ぐようにしたものがある（例えば、特許文献１参照）。 2. Description of the Related Art Conventionally, there is a type in which an explosion-proof valve is provided on a sealing plate of a capacitor in preparation for a case where a gas such as hydrogen is generated inside a power storage device such as a capacitor and the internal pressure rises. In a capacitor, the electrolytic solution impregnated in the capacitor element may cause a chemical reaction due to long-term use or usage environment, and gas may be generated in the outer case. This gas is mainly hydrogen gas due to the decomposition of moisture or gas due to evaporation of the electrolyte solution at a high temperature. If the internal pressure of the outer case increases due to this gas, the outer case will be damaged. There is. For this reason, when the pressure inside the capacitor reaches a certain level, the explosion-proof valve is ruptured, and the internal gas is discharged from the explosion-proof valve to prevent the capacitor itself from bursting (for example, Patent Document 1).
また、コンデンサの内圧上昇時に弁を破裂させてコンデンサを開放する防爆弁を設置したコンデンサにおいて、この防爆弁の動作を極力遅らせコンデンサを長寿命化させる手段として、防爆弁とは別に、例えばシリコンゴム等のガス透過性の薄膜ゴムからなるガス抜き弁を封口板に設置し、内圧上昇を抑えるものもある（例えば、特許文献２参照）。 In addition to the explosion-proof valve, a capacitor equipped with an explosion-proof valve that opens the capacitor by rupturing the valve when the internal pressure of the capacitor rises can be used as a means to extend the life of the capacitor by delaying the operation of the explosion-proof valve as much as possible. Some have a gas venting valve made of a gas permeable thin film rubber or the like installed on a sealing plate to suppress an increase in internal pressure (for example, see Patent Document 2).
ところで、閉塞されたコンデンサの内部に収納したコンデンサ素子に含浸された電解液が、コンデンサの使用環境によっては高温により気化して、外装ケースを封口する封口板の内表面に水滴として付着する場合がある。また、コンデンサの長寿命化を図るために、外装ケース内に所定量の電解液を封入することがある。その外装ケースに封入した電解液が、コンデンサの内部を流動して封口板の内表面に水滴として付着する場合がある。この電解液の水滴が封口板の内表面を伝って有底筒状のガス抜き弁の内部に浸入してガス抜き弁のガス透過部である底部に滞留したり、貫通孔に浸入した電解液が滞留した状態でガス抜き弁に付着する。 By the way, the electrolytic solution impregnated in the capacitor element housed inside the closed capacitor may vaporize due to high temperature depending on the usage environment of the capacitor, and may adhere as water droplets to the inner surface of the sealing plate that seals the outer case. is there. In addition, in order to extend the life of the capacitor, a predetermined amount of electrolyte may be sealed in the outer case. The electrolytic solution sealed in the outer case may flow inside the capacitor and adhere as water droplets to the inner surface of the sealing plate. Electrolyte that water droplets of this electrolytic solution travels along the inner surface of the sealing plate and enters the inside of the bottomed cylindrical gas vent valve and stays at the bottom of the gas permeable portion of the gas vent valve or enters the through hole. Adheres to the degassing valve in a state where it remains.
また、コンデンサの取り付け状態としてガス抜き弁が側方または斜めに傾斜するようにしてコンデンサを横向きに取り付けた場合、前述のように外装ケースの内壁に水滴となって付着した電解液や、外装ケース内に封入した電解液が、ガス抜き弁が配置する部分に溜まり、ガス抜き弁の筒状内部や封口板の貫通孔に浸入し、滞留し易くなる。 In addition, when the capacitor is mounted sideways with the degassing valve tilted sideways or diagonally as the capacitor mounted state, the electrolyte solution adhered to the inner wall of the outer case as described above, or the outer case The electrolyte sealed inside accumulates in the portion where the gas vent valve is arranged, and enters the cylindrical interior of the gas vent valve or the through hole of the sealing plate, and is liable to stay.
電解液が透過性ゴムに付着した状態が継続するとガス透過機能を阻害し、コンデンサの内部圧力が上昇してガス抜き弁が破裂し易くなるため、ガス抜き弁の開放によりコンデンサの寿命が短くなるという問題がある。 If the state where the electrolytic solution adheres to the permeable rubber continues, the gas permeation function is hindered, and the internal pressure of the capacitor rises and the degassing valve is likely to burst. There is a problem.
また、コンデンサの大型化に伴いコンデンサ内部のガス発生量も増加する傾向にある。そのため、大量のガスを放出する必要が生じている。この場合、既存のガス抜き弁のガス透過量では不十分なため、ガス抜き弁の厚みや大きさを変更する必要性があるが、ガス抜き弁を大きくするには封口板の設置可能面積に制約があることから限界がある。 In addition, the amount of gas generated inside the capacitor tends to increase as the size of the capacitor increases. Therefore, it is necessary to release a large amount of gas. In this case, the gas permeation amount of the existing gas vent valve is insufficient, so it is necessary to change the thickness and size of the gas vent valve. There are limitations due to limitations.
本発明は、このような問題点に着目してなされたもので、ガス抜き弁のガス透過部に電解液等の水分が付着し、ガス透過機能を阻害してしまうことなく、また、ガス抜き弁の大きさを変更することなく、ガス透過量を増加させ、長寿命化を達成できるとともに優れた蓄電特性を維持できるガス抜き弁を設けた蓄電デバイスを提供することを目的とする。 The present invention has been made paying attention to such a problem, and moisture such as an electrolytic solution adheres to the gas permeation part of the gas vent valve, and the gas permeation function is not hindered. It is an object of the present invention to provide an electricity storage device provided with a gas vent valve that can increase the gas permeation amount without changing the size of the valve, achieve a long life, and maintain excellent electricity storage characteristics.
前記課題を解決するために、本発明の蓄電デバイスは、
蓄電素子と、前記蓄電素子を収納する有底筒状の外装ケースと、前記外装ケースの開口部を封止する封口体とを有する蓄電デバイスであって、
前記封口板の貫通孔に、ガス透過性のガス抜き弁が設けられ、
前記ガス抜き弁が、筒状の外筒と、内筒と、前記内筒を塞ぐ第一の閉塞部と、前記外筒と前記内筒の間を塞ぐ第二の閉塞部とを備え、
第一の閉塞部は第二の閉塞部より前記蓄電素子側に配置されており、
前記外筒と前記内筒の間に前記蓄電素子側に開放された凹部が形成されていることを特徴としている。
この特徴によれば、ガス透過に寄与する内筒の第一の閉塞部と内筒の側壁部に電解液等の水分が付着しても、第一の閉塞部もしくは側壁部のいずれかの面は重力の働く方向と水平方向（配置状態に対して垂直方向）となる。このため、該面に付着した水分は、外装ケース内に落下するので、ガス透過機能が阻害されることなく、ガス透過量が減少することがない。
In order to solve the above problems, the electricity storage device of the present invention is:
An electrical storage device having an electrical storage element, a bottomed cylindrical outer case that houses the electrical storage element, and a sealing body that seals an opening of the outer case,
A gas permeable degassing valve is provided in the through hole of the sealing plate,
The gas vent valve includes a cylindrical outer cylinder, an inner cylinder, a first closing part that closes the inner cylinder, and a second closing part that closes the space between the outer cylinder and the inner cylinder,
The first closing part is arranged on the power storage element side from the second closing part,
A recess opened to the power storage element side is formed between the outer cylinder and the inner cylinder.
According to this feature, even if moisture such as an electrolyte adheres to the first closed portion of the inner cylinder that contributes to gas permeation and the side wall portion of the inner cylinder, either surface of the first closed portion or the side wall portion Is the direction of gravity and the horizontal direction (the direction perpendicular to the arrangement). For this reason, since the water | moisture content adhering to this surface falls in an exterior case, a gas permeation | transmission quantity is not reduced, without inhibiting a gas permeation | transmission function.
また、ガス抜き弁に形成された内筒の第一の閉塞部と内筒の側壁部がガス透過部として外装ケース内に表出する。ガス抜き弁の透過量は、ガスが透過する部位の面積と厚みに依存する。ガス抜き弁の側壁部からもガスを透過させることができるので、ガスが透過する面積を増加させることができる。そのため、所望のガスの透過量を調節することが可能となる。 Moreover, the 1st obstruction | occlusion part of the inner cylinder formed in the gas vent valve and the side wall part of the inner cylinder are exposed in the exterior case as a gas permeable part. The permeation amount of the gas vent valve depends on the area and thickness of the portion through which the gas permeates. Since gas can be permeated also from the side wall portion of the gas vent valve, the area through which the gas permeates can be increased. Therefore, it becomes possible to adjust the permeation amount of a desired gas.
さらに、凹部によって外筒の内側面と内筒の側壁部との間に空間が形成されている。このことにより、ガスが発生して内圧が上昇したとき、内圧により外筒の内側面は該空間から封口板の貫通孔の側面に向かって押し付けられる。そのため、ガス抜き弁と封口体の密着性が向上するとともに、固定力も維持される。 Furthermore, a space is formed between the inner side surface of the outer cylinder and the side wall portion of the inner cylinder by the recess. As a result, when gas is generated and the internal pressure rises, the internal surface of the outer cylinder is pressed from the space toward the side surface of the through hole of the sealing plate. Therefore, the adhesion between the gas vent valve and the sealing body is improved and the fixing force is also maintained.
本発明の蓄電デバイスは、前記第一の閉塞部が封口板の表面より突出して形成されていることを特徴としている。
この特徴によれば、第一の閉塞部が封口体の表面から突出する。そのため、ガス透過部となるガス抜き弁の第一の閉塞部が凹部の中に配置されない構造となる。このため、凹部に電解液等の水分が溜まった場合においても、ガス抜き弁の第一の閉塞部に水分が滞留し難い構造となる。結果として、ガス抜き弁のガス透過機能を設計通りに維持することができ、蓄電デバイスの長寿命化を達成できる。
The electricity storage device of the present invention is characterized in that the first closing portion is formed so as to protrude from the surface of the sealing plate.
According to this feature, the first closing portion protrudes from the surface of the sealing body. Therefore, it becomes a structure where the 1st obstruction | occlusion part of the degassing valve used as a gas permeation | transmission part is not arrange | positioned in a recessed part. For this reason, even when water such as an electrolytic solution accumulates in the concave portion, the structure is such that moisture does not easily stay in the first closed portion of the gas vent valve. As a result, the gas permeation function of the gas vent valve can be maintained as designed, and the life of the electricity storage device can be extended.
本発明の蓄電デバイスは、前記内筒と前記外筒とを連結する連結部が形成されていることを特徴としている。
この特徴によれば、内圧が上昇したときに、内筒の側壁部が内側へ押圧されることによる内筒の変形を連結部によって防ぐことができる。そのため、内筒が変形して、筒部が縮小して、ガスの放出経路が塞がることを防ぐことができ、蓄電デバイスの長寿命化を達成できる。
The electricity storage device of the present invention is characterized in that a connecting portion for connecting the inner cylinder and the outer cylinder is formed.
According to this feature, when the internal pressure rises, the inner cylinder can be prevented from being deformed by the connecting portion being pressed inwardly by the side wall of the inner cylinder. Therefore, it is possible to prevent the inner cylinder from being deformed, the cylinder portion from being reduced, and the gas discharge path from being blocked, and the life of the electricity storage device can be increased.
本発明の蓄電デバイスは、内筒の開口部がガス透過性を有する栓で封口されていることを特徴としている。
この特徴によれば、内筒の開口部を塞ぐことで、内筒の内部に水が溜まることを防ぐことができる。内筒の内部に水が溜まらないので、ガスの排出経路が確保され、ガスの透過性を維持できる。また、ガスを放出して外装ケース内の内圧が低下すると、内筒を通して外圧がガス抜き弁の第一の閉塞部に加わり、貫通孔からガス抜き弁が離脱するおそれがある。しかし、栓を配置して内筒の開口部を塞ぐことで、内筒を通してガス抜き弁の第一の閉塞部に加わる外圧を防ぎ、ガス抜き弁の固定力を維持できる。
The electricity storage device of the present invention is characterized in that the opening of the inner cylinder is sealed with a gas-permeable plug.
According to this feature, it is possible to prevent water from accumulating inside the inner cylinder by closing the opening of the inner cylinder. Since water does not accumulate inside the inner cylinder, a gas discharge path is secured and the gas permeability can be maintained. Further, when the gas is discharged and the internal pressure in the exterior case decreases, the external pressure is applied to the first closed portion of the gas vent valve through the inner cylinder, and the gas vent valve may be detached from the through hole. However, by disposing the stopper and closing the opening of the inner cylinder, the external pressure applied to the first closing part of the gas vent valve through the inner cylinder can be prevented, and the fixing force of the gas vent valve can be maintained.
本発明の蓄電デバイスは、前記内筒の内側に貫通孔もしくは切り欠き部を設けた管状部を備えた固定部材が配置されていることを特徴としている。
この特徴によれば、固定部材により第二の閉塞部を介して外筒を封口体の貫通孔に押し付けることできる。このことによって、ガス抜き弁と封口体の密着性を維持できるとともに、ガス抜き弁の封口体との固定性が向上する。また、固定部材を内筒に配置することで、外装ケースの内圧により内筒が内側に向かって圧力が加わっても該固定部材により、内筒の変形を防ぐことも可能となる。さらに、管状部に貫通孔や切り欠き部を設けることで、ガス抜き弁のガス透過経路が形成される。この貫通孔や切り欠き部の大きさや数を適宜変更することで、ガス透過量を調節することが可能となる。
The electricity storage device according to the present invention is characterized in that a fixing member having a tubular portion provided with a through hole or a notch is disposed inside the inner tube.
According to this feature, the outer cylinder can be pressed against the through hole of the sealing body via the second closing portion by the fixing member. Thus, the adhesion between the gas vent valve and the sealing body can be maintained, and the fixing property of the gas vent valve with the sealing body is improved. Further, by disposing the fixing member on the inner cylinder, it is possible to prevent the inner cylinder from being deformed by the fixing member even when the inner cylinder is pressurized inward by the internal pressure of the exterior case. Furthermore, the gas permeation | transmission path | route of a gas vent valve is formed by providing a through-hole and a notch part in a tubular part. The gas permeation amount can be adjusted by appropriately changing the size and number of the through-holes and notches.
本発明に係るガス抜き弁を設けた蓄電デバイスの一例として電気二重層コンデンサ１（以下、コンデンサ１）を実施するための形態を実施例に基づいて以下に説明する。 The form for implementing the electric double layer capacitor | condenser 1 (henceforth a capacitor | condenser 1) as an example of the electrical storage device which provided the gas vent valve which concerns on this invention is demonstrated below based on an Example.
本発明に係るガス抜き弁を設けたコンデンサ１につき、図１から図３を参照して説明する。図１に示されるように、コンデンサ１は、蓄電素子であるコンデンサ素子２と、このコンデンサ素子２および電解液を収納する外装ケース３と、この外装ケース３の開口部を封止する封口板４とこの封口板４に設けられたガス抜き弁９から主としてなる。 A capacitor 1 provided with a gas vent valve according to the present invention will be described with reference to FIGS. As shown in FIG. 1, a capacitor 1 includes a capacitor element 2 that is a power storage element, an exterior case 3 that stores the capacitor element 2 and an electrolytic solution, and a sealing plate 4 that seals an opening of the exterior case 3. And a gas vent valve 9 provided on the sealing plate 4.
図１に示すように、外装ケース３は、例えばアルミニウムなどの金属板を有底筒状に成形されたものであり、内部に収納するコンデンサ素子２の形状に合わせ、円形、楕円形、長円形、あるいは矩形に成形される。コンデンサ素子２は、陽極側及び陰極側の電極箔がセパレータを介して積層または捲回された構造となっており、円形、楕円形、長円形、あるいは矩形に形成される。コンデンサ素子２の端部からは、引出部６が導出され、封口板４に一体成形された外部端子５と接続されている。 As shown in FIG. 1, the outer case 3 is formed by, for example, a metal plate such as aluminum in a bottomed cylindrical shape, and is circular, elliptical, or oval according to the shape of the capacitor element 2 housed inside. Alternatively, it is molded into a rectangle. The capacitor element 2 has a structure in which anode-side and cathode-side electrode foils are laminated or wound via a separator, and is formed in a circle, an ellipse, an oval, or a rectangle. A lead-out portion 6 is led out from the end portion of the capacitor element 2 and connected to an external terminal 5 integrally formed with the sealing plate 4.
コンデンサ素子２は、詳細は特に図示しないが、分極性電極を有する集電体を、セパレータを介在させて対極させ複数層積層させたものである。分極性電極は、活性炭シートからなる２枚の分極性電極をアルミニウム箔からなる集電体を挟んで対極させた構造のものである。 Although not specifically shown in detail, the capacitor element 2 is formed by laminating a plurality of layers by collecting current collectors having polarizable electrodes with a separator interposed therebetween. The polarizable electrode has a structure in which two polarizable electrodes made of an activated carbon sheet are opposed to each other with a current collector made of an aluminum foil interposed therebetween.
図１に示されるように、封口板４は、外装ケース３の開口部に合致する形状に樹脂材などの気密性を有する材料によって成形されており、開口部の形状に応じて円形板等の形状を成し、外装ケース３の開口部を加締めことで密封状に封止している。この封口板４には、外部端子５がインサート成形されるとともに、ガス抜き弁９が設けられている。 As shown in FIG. 1, the sealing plate 4 is formed of an airtight material such as a resin material in a shape that matches the opening of the outer case 3, and a circular plate or the like is formed according to the shape of the opening. The shape is formed, and the opening of the outer case 3 is sealed by sealing. The sealing plate 4 is provided with an external terminal 5 by insert molding and a gas vent valve 9.
封口板４は、硬質絶縁体であり、たとえば、硬質合成樹脂板で形成されている。封口板４には、封口板４を貫通する貫通孔７が形成されている。つまり、貫通孔７によって、外装ケース３の内部で発生したガスの外部への放出経路が形成されている。 The sealing plate 4 is a hard insulator, and is formed of, for example, a hard synthetic resin plate. The sealing plate 4 is formed with a through hole 7 that penetrates the sealing plate 4. That is, the through-hole 7 forms a discharge path for the gas generated inside the outer case 3 to the outside.
図２に示されるように、本実施例のガス抜き弁９は、シリコン等の弾性ゴムから一体成型され、封口板４のコンデンサ素子２側から貫通孔７に密封状に嵌合される。このガス抜き弁９は、筒胴を成す外筒１０と、外筒１０の内側に形成された内筒１１と、内筒１１を塞ぐ第一の閉塞部１３と、外筒１０と内筒１１を連結する第二の閉塞部１６と、内筒１１と外筒１０と第二の閉塞部１６によって環状に形成された凹部（以下、環状凹部１７）と、外筒１０の開口端に形成された鍔部１５と、から主として構成されている。ガス抜き弁９の第一の閉塞部１３には、その中心部分に周囲の第一の閉塞部１３より薄い薄肉部１４が形成されており、この薄肉部１４によって、ガス透過性が高まる。また、コンデンサ１の内部圧力が急激に上昇した場合においては、第一の閉塞部１３の薄肉部１４が破裂することで、内部圧力を開放し、コンデンサ１の破裂を防止する。 As shown in FIG. 2, the gas vent valve 9 of the present embodiment is integrally molded from an elastic rubber such as silicon and is fitted into the through hole 7 in a sealing manner from the capacitor element 2 side of the sealing plate 4. The gas vent valve 9 includes an outer cylinder 10 that forms a cylinder body, an inner cylinder 11 that is formed inside the outer cylinder 10, a first closing portion 13 that closes the inner cylinder 11, and the outer cylinder 10 and the inner cylinder 11. Are formed at the opening end of the outer cylinder 10, a second recess 16 that connects the inner cylinder 11, the outer cylinder 10, and a recess (hereinafter referred to as an annular recess 17) formed in an annular shape by the second closure 16. It is mainly comprised from the collar part 15. The first closing part 13 of the gas vent valve 9 is formed with a thin part 14 thinner than the surrounding first closing part 13 at the center part, and the gas permeability is enhanced by the thin part 14. In addition, when the internal pressure of the capacitor 1 suddenly increases, the thin portion 14 of the first closing portion 13 is ruptured to release the internal pressure and prevent the capacitor 1 from being ruptured.
本実施例のガス抜き弁９について詳述すると、外筒１０の内側に内筒１１が形成されている。内筒１１の一方端は、第一の閉塞部１３によって、塞がれている。外筒１０の一方端の内側面と内筒１１の開放部は第二の閉塞部１６によって連結され、第二の閉塞部１６によって、内筒１１の開放部と外筒１０の内側面との空間が塞がれている。つまり、ガス抜き弁９の一方端は、第二の閉塞部１６と内筒１１によって塞がれており、第一の閉塞部１３と第二の閉塞部１６により貫通孔７が塞がれた構造となっている。 The gas vent valve 9 of this embodiment will be described in detail. An inner cylinder 11 is formed inside the outer cylinder 10. One end of the inner cylinder 11 is closed by a first closing portion 13. The inner surface of one end of the outer cylinder 10 and the open part of the inner cylinder 11 are connected by a second closing part 16, and the opening part of the inner cylinder 11 and the inner side surface of the outer cylinder 10 are connected by the second closing part 16. The space is blocked. That is, one end of the gas vent valve 9 is blocked by the second blocking portion 16 and the inner cylinder 11, and the through hole 7 is blocked by the first blocking portion 13 and the second blocking portion 16. It has a structure.
外筒１０の内側面と内筒１１の側壁部１２の間には空間が形成されており、該空間は、一方を第二の閉塞部１６よって塞がれ、もう一方はコンデンサ素子２側に開放された溝状になっており、内筒１１の周囲を取り囲むように形成された環状凹部１７を形成している。環状凹部１７には、内筒１１の側壁部１２と外筒１０の内側面を連結する連結部１８が等間隔に４つ形成されている。 A space is formed between the inner side surface of the outer cylinder 10 and the side wall portion 12 of the inner cylinder 11. One of the spaces is closed by the second closing portion 16, and the other is on the capacitor element 2 side. An open groove shape is formed, and an annular recess 17 is formed so as to surround the periphery of the inner cylinder 11. Four connecting portions 18 that connect the side wall portion 12 of the inner cylinder 11 and the inner side surface of the outer cylinder 10 are formed in the annular recess 17 at equal intervals.
内筒１１の第一の閉塞部１３は、コンデンサ素子２側に配置されるように形成されている。また、第一の閉塞部１３は第二の閉塞部１６よりもコンデンサ素子２側の位置に形成されている。 The first closing portion 13 of the inner cylinder 11 is formed so as to be disposed on the capacitor element 2 side. The first closing portion 13 is formed at a position closer to the capacitor element 2 than the second closing portion 16.
図３は、ガス抜き弁９を封口板４に取り付けた状態を示している。外筒１０の外周径は貫通孔７の直径と同等以上の大きさであり、嵌合することにより、ガス抜き弁９が貫通孔７内に固定されている。鍔部１５は、ガス抜き弁９を封口板４の貫通孔７に嵌合する際に、封口板４の表面に当接し、ガス抜き弁９が貫通孔７内に必要以上に挿入されないように係止するストッパーの働きをする。内筒１１の第一の閉塞部１３は、封口板４の表面から突出している。このように、内筒１１の第一の閉塞部１３は、環状凹部１７内に配置されない構造であるため、電解液等の水分が環状凹部１７に滞留した場合であっても、ガス透過部である第一の閉塞部１３や側壁部１２に電解液が継続的に付着することがない。このため、電解液等の水分によってガス透過機能が阻害されることを防止できる。 FIG. 3 shows a state in which the gas vent valve 9 is attached to the sealing plate 4. The outer diameter of the outer cylinder 10 is equal to or larger than the diameter of the through hole 7, and the gas vent valve 9 is fixed in the through hole 7 by fitting. When fitting the gas vent valve 9 into the through hole 7 of the sealing plate 4, the flange 15 contacts the surface of the sealing plate 4 so that the gas vent valve 9 is not inserted into the through hole 7 more than necessary. Acts as a stopper to lock. The first closing portion 13 of the inner cylinder 11 protrudes from the surface of the sealing plate 4. As described above, since the first closing portion 13 of the inner cylinder 11 has a structure that is not disposed in the annular recess 17, even if moisture such as an electrolyte stays in the annular recess 17, The electrolyte does not continuously adhere to the first closed portion 13 or the side wall portion 12. For this reason, it can prevent that a gas permeation function is inhibited by moisture, such as electrolyte solution.
ガス透過部を内筒１１の第一の閉塞部１３と側壁部１２とすることで、ガス抜き弁９を大きくすることなく、ガスの透過面積を大きくすることができ、ガスの透過量を向上させることができる。ガスの透過量は、ガス抜き弁９の厚みとガスが透過する面積によって規定される。本実施例では、環状凹部１７によって、内筒１１の第一の閉塞部１３のみならず、内筒１１の側壁部１２からもガスの透過を可能にし、より多くのガスを透過させることができる。また、側壁部１２の大きさを変更することで、ガス透過量を調節することが可能となり、ガス抜き弁９の大きさを変更することなく、所望のガス透過量を得ることができる。 By making the gas permeation part the first closed part 13 and the side wall part 12 of the inner cylinder 11, the gas permeation area can be increased without increasing the gas vent valve 9, and the gas permeation amount is improved. Can be made. The gas permeation amount is defined by the thickness of the gas vent valve 9 and the area through which the gas permeates. In the present embodiment, the annular recess 17 allows not only the first closing portion 13 of the inner cylinder 11 but also the side wall portion 12 of the inner cylinder 11 to transmit gas and allow more gas to pass therethrough. . Further, by changing the size of the side wall portion 12, it becomes possible to adjust the gas permeation amount, and a desired gas permeation amount can be obtained without changing the size of the gas vent valve 9.
また、本発明では、封口板４から突出した内筒１１の第一の閉塞部１３に加え、側壁部１２からもガスを透過させることができる。このように、ガスの透過面が複数（ガス抜き弁９の第一の閉塞部１３の面と側壁部１２の面）あるため、電解液が付着しにくい面を経由してガスを透過させることができる。つまり、コンデンサ素子２の底面が下になるようにコンデンサ１が使用された場合、内筒１１の側壁部１２は垂直な状態で配置されるため、内筒１１の側壁部１２に付着した電解液は、コンデンサ素子２側に落下する。このため、内筒１１に電解液等の水分が付着しても、少なくとも側壁部１２に付着した電解液等の水分は排水されることとなり、側壁部１２からのガスの透過を維持できる。また、コンデンサ素子２が横向きや封口板４が下向きになるようにコンデンサ１が使用された場合においては、内筒１１の第一の閉塞部１３や側壁部１２が垂直な状態に配置されるため、内筒１１に付着した電解液等の水分は重力の働きにより排水される。このように、内筒１１の第一の閉塞部１３だけではなく、側壁部１２についてもガスを透過させる部位とすることで、コンデンサ１の配置方向を問わず、ガス抜き弁９に付着した電解液等の水分はガス透過に寄与するいずれかの面から排水され、電解液等の水分の付着によるガス透過機能の低下を防ぐ。このように、ガス抜き箇所として、ガス抜き弁９の第一の閉塞部１３に加え、その側壁部１２を活用することで、電解液等の水分がその一方に付着しても、他方が機能するため、ガス抜きの動作を安定させることができ、コンデンサ１の長寿命化を実現できる。 Further, in the present invention, gas can be transmitted through the side wall portion 12 in addition to the first closed portion 13 of the inner cylinder 11 protruding from the sealing plate 4. As described above, since there are a plurality of gas permeation surfaces (the surface of the first closing portion 13 and the surface of the side wall portion 12 of the gas vent valve 9), the gas is permeated through the surface to which the electrolytic solution is difficult to adhere. Can do. That is, when the capacitor 1 is used so that the bottom surface of the capacitor element 2 faces down, the side wall portion 12 of the inner cylinder 11 is arranged in a vertical state, so that the electrolytic solution adhered to the side wall portion 12 of the inner cylinder 11 Falls to the capacitor element 2 side. For this reason, even if moisture such as an electrolytic solution adheres to the inner cylinder 11, at least the moisture such as the electrolytic solution attached to the side wall portion 12 is drained, and gas permeation from the side wall portion 12 can be maintained. Further, when the capacitor 1 is used so that the capacitor element 2 faces sideways and the sealing plate 4 faces downward, the first closed portion 13 and the side wall portion 12 of the inner cylinder 11 are arranged in a vertical state. The water such as the electrolytic solution adhering to the inner cylinder 11 is drained by the action of gravity. Thus, not only the first closed part 13 of the inner cylinder 11 but also the side wall part 12 is a part that allows gas to pass through, so that the electrolysis adhered to the gas vent valve 9 regardless of the arrangement direction of the capacitor 1. Moisture such as liquid is drained from any surface that contributes to gas permeation, and prevents deterioration of gas permeation function due to adhesion of moisture such as electrolyte. Thus, by utilizing the side wall portion 12 in addition to the first closing portion 13 of the gas vent valve 9 as a degassing location, even if moisture such as an electrolytic solution adheres to one side, the other functions. Therefore, the degassing operation can be stabilized and the life of the capacitor 1 can be extended.
外筒１０と内筒１１の間には環状凹部１７が形成されている。内圧が上昇すると、環状凹部１７によって、形成された空間により、内圧が外筒１０の内側面に加わり、図示矢印Ｘのように、外筒１０が封口体の貫通孔７の側面に押圧される。このことにより、密閉性が高められるだけではなく、より強固に封口板４に密着し、固定力を維持できる。 An annular recess 17 is formed between the outer cylinder 10 and the inner cylinder 11. When the internal pressure rises, the internal pressure is applied to the inner side surface of the outer cylinder 10 by the space formed by the annular recess 17, and the outer cylinder 10 is pressed against the side surface of the through hole 7 of the sealing body as shown by the arrow X in the figure. . As a result, not only the sealing performance is improved, but also the sealing plate 4 can be more firmly attached and the fixing force can be maintained.
また、環状凹部１７には、内筒１１の側壁部１２と外筒１０の内側面を連結する連結部１８が形成されている。外装ケース３の内部で発生したガスにより内圧が上昇すると、内筒１１に対して、内筒１１の内側に向かう圧力が生じる。この圧力により、内筒１１が内側に収縮するように変形して、ガス放出経路が塞がることで、ガス透過量に悪影響を及ぼす虞がある。しかしながら、内筒１１の側壁部１２と外筒１０の内側面と連結する連結部１８によって、側壁部１２が内側に変形する状態を防止できる。 The annular recess 17 is formed with a connecting portion 18 that connects the side wall portion 12 of the inner cylinder 11 and the inner surface of the outer cylinder 10. When the internal pressure rises due to the gas generated inside the outer case 3, a pressure toward the inner side of the inner cylinder 11 is generated with respect to the inner cylinder 11. Due to this pressure, the inner cylinder 11 is deformed so as to shrink inward, and the gas discharge path is blocked, which may adversely affect the gas permeation amount. However, the connecting portion 18 connected to the side wall portion 12 of the inner cylinder 11 and the inner side surface of the outer cylinder 10 can prevent the side wall portion 12 from being deformed inward.
この封口板４の外側には、貫通孔７に連通する筒部１９が形成されている。この筒部１９には、有底筒状のゴム製の防湿弁２２が配置される。筒部１９の周囲部には、溝が設けられている。この溝を挟んで立壁部２１が形成されている。この立壁部２１は、筒部１９より高く、筒部１９に被せられた防湿弁２２よりも高く設定されている。これにより、防湿弁２２が立壁部２１により防護される。防湿弁２２は上方から座金２４により押圧された状態で固定される。 A cylindrical portion 19 that communicates with the through hole 7 is formed outside the sealing plate 4. The cylindrical portion 19 is provided with a bottomed cylindrical rubber moisture-proof valve 22. Grooves are provided in the periphery of the cylindrical portion 19. A standing wall portion 21 is formed across the groove. The standing wall portion 21 is set higher than the cylindrical portion 19 and higher than the moisture-proof valve 22 covered on the cylindrical portion 19. Thereby, the moisture-proof valve 22 is protected by the standing wall portion 21. The moisture-proof valve 22 is fixed while being pressed by a washer 24 from above.
外装ケース３の内部にガスが充満し、ガス抜き弁９を通してガスが貫通孔７に流れ、貫通孔７内の内圧が上昇すると、そのガスは筒部１９に形成された切り欠き部２０を通して防湿弁２２の側壁部２３に作用し、側壁部２３を筒部１９から引き離す。これにより、ガス排出経路が形成される。外装ケース３内のガスは、貫通孔７から切り欠き部２０に流れ、外気に開放される。この結果、防爆機能が得られる。つまり、外装ケース３内に充満するガスを外装ケース３内の内圧上昇に応じて排出でき、外装ケース３内の圧力上昇を抑制でき、コンデンサ１の変形を防ぐことができる。また、外装ケース３の内圧をガス排出により抑制できるので、外装ケース３内にガスが溜まらず、コンデンサ１の寿命を延ばすことができる。なお、急激にガスが発生して、外装ケース３内の圧力が急激に上昇した場合には、防湿弁２２が開弁する。 When the interior case 3 is filled with gas, the gas flows into the through hole 7 through the gas vent valve 9, and the internal pressure in the through hole 7 rises, the gas is moisture-proof through the notch portion 20 formed in the cylindrical portion 19. Acting on the side wall 23 of the valve 22, the side wall 23 is pulled away from the tube portion 19. Thereby, a gas discharge path is formed. The gas in the outer case 3 flows from the through hole 7 to the notch 20 and is released to the outside air. As a result, an explosion-proof function is obtained. That is, the gas filling the outer case 3 can be discharged according to the increase in the internal pressure in the outer case 3, the pressure increase in the outer case 3 can be suppressed, and the deformation of the capacitor 1 can be prevented. In addition, since the internal pressure of the outer case 3 can be suppressed by gas discharge, gas does not accumulate in the outer case 3 and the life of the capacitor 1 can be extended. Note that when the gas is suddenly generated and the pressure in the outer case 3 rapidly increases, the moisture-proof valve 22 is opened.
座金２４は、環状の本体部を備えたばね板である。この座金２４は防湿弁２２の圧接部材の一例である。防湿弁２２を押圧する本体部の周縁には、一定の間隔で突片２５が本体と一体に形成されている。各突片２５は、本体部に対して鈍角状に折り曲げられている。鈍角に折り曲げられた突片２５を含む座金２４の直径は、立壁部２１の上面部の開口部の直径より大きく形成されている。座金２４は、立壁部２１に圧入させ、立壁面に係止させた突片２５により封口板４に取り付けられている。つまり、座金２４の複数の突片２５が備える弾性および剛性により、防湿弁２２が筒部１９に押し付けられ、その状態で防湿弁２２が筒部１９上に強固に維持される。このような構成にすれば、筒部１９から防湿弁２２が外れるのを防止できる。 The washer 24 is a spring plate having an annular main body. The washer 24 is an example of a pressure contact member of the moisture-proof valve 22. Protruding pieces 25 are formed integrally with the main body at regular intervals on the periphery of the main body that presses the moisture-proof valve 22. Each protrusion 25 is bent at an obtuse angle with respect to the main body. The diameter of the washer 24 including the projecting piece 25 bent at an obtuse angle is formed larger than the diameter of the opening on the upper surface portion of the standing wall portion 21. The washer 24 is attached to the sealing plate 4 by a protruding piece 25 that is press-fitted into the standing wall portion 21 and locked to the standing wall surface. That is, due to the elasticity and rigidity of the plurality of projecting pieces 25 of the washer 24, the moisture-proof valve 22 is pressed against the cylindrical portion 19, and the moisture-proof valve 22 is firmly maintained on the cylindrical portion 19 in this state. With such a configuration, it is possible to prevent the moisture-proof valve 22 from being detached from the cylindrical portion 19.
このように防湿弁２２を配置することによって、貫通孔７を通して外部から浸入する水分を防止することができる。また、コンデンサ１内の水分濃度は、外部の空気雰囲気中の水分濃度より低い。そのため、外部の水分がコンデンサ１内に浸入しやすくなり、ガス抜き弁９の気液分離の作用が低下する場合がある。そこで、ガス抜き弁９の外側に防湿弁２２を配置することで、ガス抜き弁９と外部の空気雰囲気との接触を防止し、水分の浸入をより防ぐことができる。また、ガスを放出して外装ケース３内の内圧が低下すると、貫通孔７を通して外圧がガス抜き弁９の第一の閉塞部１３に加わり、貫通孔７からガス抜き弁９が離脱するおそれがある。しかし、防湿弁２２を配置して貫通孔７の封口板４の外部側を塞ぐことで、貫通孔７を通してガス抜き弁９の第一の閉塞部１３に加わる外圧を防ぎ、ガス抜き弁９の固定力を維持できる。 By disposing the moisture-proof valve 22 in this way, moisture that enters from the outside through the through hole 7 can be prevented. Further, the moisture concentration in the capacitor 1 is lower than the moisture concentration in the external air atmosphere. For this reason, external moisture can easily enter the capacitor 1 and the gas-liquid separation action of the gas vent valve 9 may be reduced. Therefore, by disposing the moisture-proof valve 22 outside the gas vent valve 9, contact between the gas vent valve 9 and the external air atmosphere can be prevented, and moisture can be further prevented from entering. Further, when the gas is released and the internal pressure in the outer case 3 decreases, the external pressure is applied to the first closing portion 13 of the gas vent valve 9 through the through hole 7, and the gas vent valve 9 may be detached from the through hole 7. is there. However, by disposing the moisture-proof valve 22 and closing the outside of the sealing plate 4 of the through hole 7, the external pressure applied to the first closing part 13 of the gas vent valve 9 through the through hole 7 is prevented, and the gas vent valve 9 The fixing force can be maintained.
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。 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.
上記実施例では、内筒１１の第一の閉塞部１３を封口板４の表面から突出して形成したが、少なくともガス抜き弁９の第一の閉塞部１３が第二の閉塞部１６から突出する高さであればよい。このようにすることによって、ガス抜き弁９の第一の閉塞部１３が電解液等の水滴が滞留してガス透過性が阻害されることを防ぎつつ、封口体を低背化し、総じてコンデンサ１の低背化を実現できる。 In the above embodiment, the first closing portion 13 of the inner cylinder 11 is formed so as to protrude from the surface of the sealing plate 4, but at least the first closing portion 13 of the gas vent valve 9 protrudes from the second closing portion 16. Any height is sufficient. By doing in this way, the 1st obstruction | occlusion part 13 of the gas vent valve 9 makes a sealing body low-profile while preventing that water droplets, such as electrolyte solution, retain gas permeability, and the capacitor | condenser 1 generally. Can be realized.
上記実施例では、内筒１１を通して外部から浸入する水分を防止する手段として、防湿弁２２を配置したが、これに代えて、もしくはこれに加えて、内筒１１の開放部にガス透過性の栓２６を配置してもよい。図４に示すように、栓２６は、内筒１１の筒内に挿入する柱部２７と柱部２７と一体成型された蓋部２８によって構成されている。内筒１１の開放部にガス透過性の栓２６を配置することで、外部からの水分の浸入を防ぐとともに、内筒１１の第一の閉塞部１３および側壁部１２から透過したガスを外部に排出することができる。また、柱部２７の径を内筒１１の開放部の径と同等以上の大きさにすることで、内筒１１に配置したとき、第二の閉塞部１６を介して、外筒１０を封口板４の貫通孔７の内側面の方向に押圧する。このことによって、ガス抜き弁９を封口板４に強固に固定できるとともに、密封性を維持できる。 In the above-described embodiment, the moisture-proof valve 22 is disposed as a means for preventing moisture entering from the outside through the inner cylinder 11, but instead of this, or in addition to this, a gas permeable gas is provided in the open portion of the inner cylinder 11. A plug 26 may be arranged. As shown in FIG. 4, the plug 26 includes a column portion 27 that is inserted into the cylinder of the inner cylinder 11 and a lid portion 28 that is integrally molded with the column portion 27. By disposing a gas-permeable plug 26 in the open portion of the inner cylinder 11, moisture can be prevented from entering from the outside, and the gas that has permeated from the first closed portion 13 and the side wall portion 12 of the inner cylinder 11 is exposed to the outside. Can be discharged. Further, by setting the diameter of the column part 27 to be equal to or larger than the diameter of the open part of the inner cylinder 11, the outer cylinder 10 is sealed through the second closing part 16 when arranged in the inner cylinder 11. Press in the direction of the inner surface of the through hole 7 of the plate 4. As a result, the gas vent valve 9 can be firmly fixed to the sealing plate 4 and the sealing performance can be maintained.
また、図５に示すように、内筒１１に管状の固定部材２９を挿入してもよい。このようにすることによって、第二の閉塞部１６を介して、外筒１０を封口体側に押圧して、ガス抜き弁９を封口板４に密着させ、固定させることができる。また、管状部３０を内筒１１の側壁部１２まで長くした場合、外装ケース３の内圧により内筒１１が内側に向かって圧力が加わっても該管状部３０により、内筒１１の変形を防ぐことも可能となる。このとき、管状部３０に所望の大きさや数の貫通孔３１を設けることで、ガス透過量を調節することが可能となる。なお、貫通孔３１のみならず、切り欠きなど内筒１１の側壁部１２で透過したガスが管状部３０内に流入する経路が形成される手段であるならばよい。なお、固定部材２９の管状部３０を内筒１１の側壁部１２まで形成した場合、管状部３０でも内筒１１の変形を防ぐことが可能であるため、連結部１８がなくてもよい。 Further, as shown in FIG. 5, a tubular fixing member 29 may be inserted into the inner cylinder 11. By doing in this way, the outer cylinder 10 can be pressed to the sealing body side via the 2nd obstruction | occlusion part 16, and the gas vent valve 9 can be closely_contact | adhered to the sealing board 4, and can be fixed. Further, when the tubular portion 30 is extended to the side wall portion 12 of the inner cylinder 11, even when the inner cylinder 11 is pressurized inward by the internal pressure of the exterior case 3, the tubular portion 30 prevents deformation of the inner cylinder 11. It is also possible. At this time, the gas permeation amount can be adjusted by providing the tubular portion 30 with through holes 31 having a desired size and number. Any means may be used as long as a path through which gas permeated through the side wall portion 12 of the inner cylinder 11 flows into the tubular portion 30 as well as the through hole 31 is formed. In addition, when the tubular part 30 of the fixing member 29 is formed up to the side wall part 12 of the inner cylinder 11, since the deformation of the inner cylinder 11 can be prevented even in the tubular part 30, the connecting part 18 may be omitted.
また、上記実施例では、連結部１８を等間隔に４つ形成したが、これに限らない。想定されるな内圧や、ガス抜き弁９で用いる材質の硬度等を考慮して、連結部１８の数や大きさを適宜変更すればよい。 Moreover, in the said Example, although the four connection parts 18 were formed at equal intervals, it is not restricted to this. The number and size of the connecting portions 18 may be appropriately changed in consideration of the assumed internal pressure and the hardness of the material used for the gas vent valve 9.
また、上記実施例では、ガス抜き弁９の材質として、シリコンを用いたがこれに限らず、気液分離性があってかつガス透過性がある材料であれば適用可能である。 Moreover, in the said Example, although silicon was used as a material of the gas vent valve 9, it is not restricted to this, It is applicable if it is a material which has gas-liquid separability and gas permeability.
また、上記実施例では、ガス抜き弁９が設けられた封口板４が電気二重層コンデンサに適用されているが、本発明に係る封口板４が適用される対象となる蓄電デバイスの種類は、必ずしも電気二重層コンデンサに限られず、例えば電解コンデンサでもよいし、内部で水素や一酸化炭素等の多種・大量のガスを発生する種々のコンデンサやキャパシタ、電池に適用可能である。 Moreover, in the said Example, although the sealing board 4 provided with the gas vent valve 9 is applied to the electric double layer capacitor, the kind of electrical storage device to which the sealing board 4 according to the present invention is applied is as follows. The capacitor is not necessarily limited to an electric double layer capacitor, and may be, for example, an electrolytic capacitor, or may be applied to various capacitors, capacitors, and batteries that generate a large amount of various gases such as hydrogen and carbon monoxide.
１ 電気二重層コンデンサ（コンデンサ）
２ コンデンサ素子
３ 外装ケース
４ 封口板
５ 外部端子
６ 引出部
７ 貫通孔
９ ガス抜き弁
１０ 外筒
１１ 内筒
１２ 側壁部
１３ 第一の閉塞部
１４ 薄肉部
１５ 鍔部
１６ 第二の閉塞部
１７ 環状凹部
１８ 連結部
１９ 筒部
２０ 切り欠き部
２１ 立壁部
２２ 防湿弁
２３ 側壁部
２４ 座金
２５ 突片
２６ 栓
２７ 柱部
２８ 蓋部
２９ 固定部材
３０ 管状部
３１ 貫通孔
1 Electric double layer capacitor (capacitor)
2 Capacitor element 3 Exterior case 4 Sealing plate 5 External terminal 6 Lead-out part 7 Through hole 9 Gas vent valve 10 Outer cylinder 11 Inner cylinder 12 Side wall part 13 First closing part 14 Thin part 15 Gutter part 16 Second closing part 17 Annular recess 18 Connecting portion 19 Tube portion 20 Notch portion 21 Standing wall portion 22 Moisture proof valve 23 Side wall portion 24 Washer 25 Projection piece 26 Plug 27 Column portion 28 Lid portion 29 Fixing member 30 Tubular portion 31 Through hole
Claims (5)
前記封口板の貫通孔に、ガス透過性のガス抜き弁が設けられ、
前記ガス抜き弁が、筒状の外筒と、内筒と、前記内筒を塞ぐ第一の閉塞部と、前記外筒と前記内筒の間を塞ぐ第二の閉塞部とを備え、
前記第一の閉塞部は前記第二の閉塞部より前記蓄電素子側に配置されており、
前記外筒と前記内筒の間に前記蓄電素子側に開放された凹部が形成されていること
を特徴とする蓄電デバイス。 An electrical storage device having an electrical storage element, a bottomed cylindrical outer case that houses the electrical storage element, and a sealing body that seals an opening of the outer case,
A gas permeable degassing valve is provided in the through hole of the sealing plate,
The gas vent valve includes a cylindrical outer cylinder, an inner cylinder, a first closing part that closes the inner cylinder, and a second closing part that closes the space between the outer cylinder and the inner cylinder,
The first closing part is arranged on the power storage element side from the second closing part,
A power storage device, wherein a concave portion opened to the power storage element side is formed between the outer cylinder and the inner cylinder.
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| JP2013086167A JP6264526B2 (en) | 2013-04-17 | 2013-04-17 | Power storage device |
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| JPS5518786U (en) * | 1978-07-25 | 1980-02-06 | ||
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