JP6225499B2 - Explosion-proof device for sealed electrochemical devices - Google Patents

Explosion-proof device for sealed electrochemical devices Download PDF

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JP6225499B2
JP6225499B2 JP2013125038A JP2013125038A JP6225499B2 JP 6225499 B2 JP6225499 B2 JP 6225499B2 JP 2013125038 A JP2013125038 A JP 2013125038A JP 2013125038 A JP2013125038 A JP 2013125038A JP 6225499 B2 JP6225499 B2 JP 6225499B2
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explosion
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邦年 睦月
邦年 睦月
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Mutsuki Electric KK
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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
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    • Y02E60/13—Energy storage using capacitors

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本発明は、金属材でできた封口板により封口された本体内に電解液を有するコンデンサーやリチウム電池などの密閉型電気化学デバイスにおいて、本体内に発生したガスを排出する防爆装置に関する。The present invention relates to an explosion-proof device that discharges gas generated in a main body in a sealed electrochemical device such as a capacitor or a lithium battery having an electrolytic solution in a main body sealed by a sealing plate made of a metal material.

封口板により封口された本体内に電解液を有するコンデンサーやリチウム電池などの密閉型電気化学デバイスにあっては、電解液が本体外に漏れ出ないように密閉されているので、充放電サイクルを繰り返したり、高温で放置したり、短絡・過充電・逆充電などにより電解液が分解されて、その本体内で水素ガスや炭酸ガスなどのガスが発生し、そのガスが本体内に蓄積されることにより急激に内圧が上昇して、密閉型電気化学デバイスが破裂しないように、本体内に発生したガスを排出する防爆装置が前記封口板に設けられている。例えば、特許文献１にて、電解液を有する電池において、封口板がガス抜き穴となるガス排出用孔を有する金属材でできており、そのガス排出用孔を常時閉塞する弁体がポリエチレン樹脂やポリエチレン樹脂の合成樹脂材のフィルムとアルミニウムなどの金属薄板とを貼り合わせた複合被膜で構成して破断させる防爆装置が提案されている。Capacitors with electrolyte in the main body sealed by the sealing plate and sealed electrochemical devices such as lithium batteries are sealed so that the electrolyte does not leak out of the main body. The electrolyte solution is decomposed by repeated, left at high temperature, short circuit, overcharge, reverse charge, etc., and gas such as hydrogen gas or carbon dioxide gas is generated in the main body, and the gas is accumulated in the main body Thus, the sealing plate is provided with an explosion-proof device for discharging the gas generated in the main body so that the internal pressure does not rapidly increase and the sealed electrochemical device does not burst. For example, in Patent Document 1, in a battery having an electrolytic solution, a sealing plate is made of a metal material having a gas exhaust hole serving as a gas vent hole, and a valve body that always closes the gas exhaust hole is a polyethylene resin. There has been proposed an explosion-proof device comprising a composite film in which a film of a synthetic resin material such as polyethylene resin and a metal thin plate such as aluminum are bonded to each other and breaking.

しかし、特許文献１の防爆装置は、金属材でできた封口板により封口された前記本体内に発生したガスをガス排出用孔から排出するに際して、ガス排出用孔を常時閉塞する弁体が所定以上の内圧により破断して密閉型電気化学デバイスが破裂するのを防止するとともにアルミニウムなどの金属薄板は本体外から水蒸気や水などの水分が本体内に透過しないように作用するが、本体内に発生した水素ガスや炭酸ガスなどのガスのみをその都度、排出させて、内圧上昇となるガスを本体内に蓄積させないようにして密閉型電気化学デバイスの性能の低下を招かないようにすることは考慮されていない。However, the explosion-proof device disclosed in Patent Document 1 has a predetermined valve body that always closes the gas discharge hole when the gas generated in the main body sealed by the sealing plate made of a metal material is discharged from the gas discharge hole. While preventing the sealed electrochemical device from rupturing due to the above internal pressure, a thin metal plate such as aluminum works to prevent moisture such as water vapor and water from permeating into the main body from outside the main body. It is necessary to discharge only the generated hydrogen gas or carbon dioxide gas each time so as not to accumulate the gas that increases the internal pressure in the main body so as not to cause the performance of the sealed electrochemical device to deteriorate. Not considered.

そこで、ガス排出用孔を常時閉塞する弁体が所定以上の内圧により破断して密閉型電気化学デバイスが破裂するのを防止するに際して、前記本体外から水蒸気や水などの水分が本体内に透過しないようにするとともに前記本体内に発生した水素ガスや炭酸ガスなどのガスのみをその都度、排出させて、内圧上昇となるガスを本体内に蓄積させないようにする機能をもたせた防爆装置が要望される。その防爆装置として、特許文献２には密閉型電気化学デバイスが、開放端を有している缶と、前記缶から前記電気化学材料が漏出するのを防止するためのナイロンなどの合成樹脂材でできたシールと、ガス排出用孔となる開口を有する金属材でできた内側被覆（封口板）とを有する電気化学的セルであって、このシールは、他の部分よりも薄い、少なくとも１つの圧力逃がしセグメントを有していて、過剰な内部セル圧力により圧力逃がしセグメントが裂けて、開口を通って内部気体（ガス）がセルを出るのを可能とし、さらに、シールとは別にアスファルトやワニスなどから形成された湿気不浸透性材料の層が配置され、シールの外側の面した位置に外側被覆が挿入された湿気防護壁を有する電気化学的セルが提案されている。Therefore, when preventing the valve body that always closes the gas discharge hole from breaking due to an internal pressure higher than a predetermined level and rupturing the sealed electrochemical device, moisture such as water vapor or water permeates into the main body from outside the main body. There is a demand for an explosion-proof device that has a function to prevent the accumulation of gas that increases internal pressure by discharging only gas such as hydrogen gas and carbon dioxide gas generated in the main body each time. Is done. As an explosion-proof device, Patent Document 2 discloses that a sealed electrochemical device is composed of a can having an open end and a synthetic resin material such as nylon for preventing leakage of the electrochemical material from the can. An electrochemical cell having a seal made and an inner covering (sealing plate) made of a metal material having an opening to be a gas discharge hole, wherein the seal is at least one thinner than the other parts Has a pressure relief segment that allows the internal relief of the internal gas (gas) to exit the cell through an opening, asphalt or varnish, etc. An electrochemical cell has been proposed having a moisture barrier with a layer of moisture impervious material formed from and having an outer covering inserted at the outer facing location of the seal.

しかし、特許文献２のように提案された湿気防護壁を有する電気化学的セルにおいては、アスファルトやワニスなどから形成された湿気不浸透性材料の層が破断可能とする配慮がされていない。However, in the electrochemical cell having a moisture protection wall proposed as in Patent Document 2, consideration is not given to making the moisture-impermeable material layer formed of asphalt or varnish breakable.

特開平２−１２７５７号公報JP-A-2-12757 特許第４２２５６９６号公報Japanese Patent No. 4225696

本発明は、上記の問題点を解消するために、ガス排出用孔を有し金属材でできた封口板により封口された本体内に電解液を有するコンデンサーやリチウム電池などの密閉型電気化学デバイスで、本体内の急激な内圧上昇時にガスを一気に排出するとともに内圧上昇となるガスを本体内に蓄積させないように本体外に排出する機能をもたせた防爆装置において、生産性のよい防爆装置を提供することを目的とする。In order to solve the above problems, the present invention provides a sealed electrochemical device such as a capacitor or a lithium battery having an electrolytic solution in a main body sealed by a sealing plate made of a metal material having a gas discharge hole. In the explosion-proof device that has the function of discharging the gas at a stroke when the internal pressure suddenly increases inside the main body and discharging the gas that increases the internal pressure outside the main body so as not to accumulate in the main body, a highly productive explosion-proof device is provided. The purpose is to do.

本発明の密閉型電気化学デバイス用防爆装置は、ガス排出用孔を有し金属材でできた封口板により封口された本体内に電解液を有するコンデンサーやリチウム電池などの密閉型電気化学デバイス用防爆装置において、前記封口板のガス排出用孔に密着接合された周壁部と前記周壁部の両端で前記周壁部を交叉する方向に延出して前記封口板の両面に密着接合された環状鍔部と前記封口板のガス排出用孔を閉塞させた破断可能な薄膜部とからなるガスの透過性のある合成樹脂材で成形してできた筒状の防爆装置用弁体となるように前記合成樹脂材を前記封口板と一体に成形した密閉型電気化学デバイス用防爆装置であって、前記破断可能な薄膜部は前記周壁部の他方の端面から前記周壁部の一方の端面に向かって先細となる断面が三角形状の切り込みが形成されてできており、前記周壁部の一方の端面の外面の一部分に水分を遮断し破断可能な金属材でできたバリヤー部を設けて、前記バリヤー部により本体外から水分を本体内に透過させにくくするとともに前記本体内に発生したガスを本体内に蓄積させないように前記周壁部の一方の端面の外面の他の部分から透過させて本体外に排出するようにしたことを特徴とする。同請求項２に記載の発明は、請求項１に記載の密閉型電気化学デバイス用防爆装置で、前記周壁部の一方の端面には凹所が形成されており、前記破断可能な薄膜部は前記周壁部の他方の端面から前記凹所に向かって先細となる断面が三角形状の切り込みが形成されてできており、前記周壁部の一方の端面の外面の一部分に前記薄膜部を含むように前記凹所を閉塞して本体外から水分を本体内に透過させにくくするとともに前記本体内に発生したガスを本体内に蓄積させないように前記周壁部の一方の端面の外面の他の部分から透過させて本体外に排出するようにしたことを特徴とする。The explosion-proof device for a sealed electrochemical device of the present invention is used for a sealed electrochemical device such as a capacitor or a lithium battery having an electrolytic solution in a main body sealed with a sealing plate made of a metal material having a gas discharge hole. In the explosion-proof device, a peripheral wall part tightly joined to the gas discharge hole of the sealing plate and an annular flange part tightly joined to both surfaces of the sealing plate extending in a direction crossing the peripheral wall part at both ends of the peripheral wall part And a synthetic explosion-proof valve body formed of a gas-permeable synthetic resin material comprising a gas-permeable synthetic resin material having a gas discharge hole in the sealing plate closed. An explosion-proof device for a sealed electrochemical device in which a resin material is molded integrally with the sealing plate , wherein the breakable thin film portion is tapered from the other end surface of the peripheral wall portion toward one end surface of the peripheral wall portion. The cross section becomes a triangular cut Inclusive are made is formed, the cut off water to a portion of the outer surface of one end surface of the peripheral wall portion provided with a barrier portion made of breakable metal material, moisture within the body from outside the body by the barrier section The gas generated in the main body is prevented from being accumulated in the main body and is transmitted from the other part of the outer surface of one end surface of the peripheral wall portion and discharged out of the main body. To do. The invention according to claim 2 is the explosion-proof device for a sealed electrochemical device according to claim 1, wherein a recess is formed on one end surface of the peripheral wall portion, and the breakable thin film portion is A cross-section tapering from the other end surface of the peripheral wall portion toward the recess is formed with a triangular cut, and the thin film portion is included in a part of the outer surface of one end surface of the peripheral wall portion. The recess is closed to make it difficult for moisture to permeate from the outside of the main body into the main body and to prevent the gas generated in the main body from accumulating in the main body from the other part of the outer surface of one end surface of the peripheral wall portion. It is characterized by being discharged out of the main body .

本発明の密閉型電気化学デバイス用防爆装置は、ガス排出用孔を有し金属材でできた封口板により封口された本体内に電解液を有するコンデンサーやリチウム電池などの密閉型電気化学デバイス用防爆装置において、前記封口板のガス排出用孔に密着接合された周壁部と前記周壁部の両端で前記周壁部を交叉する方向に延出して前記封口板の両面に密着接合された環状鍔部と前記封口板のガス排出用孔を閉塞させた破断可能な薄膜部とからなるガスの透過性のある合成樹脂材で成形してできた筒状の防爆装置用弁体となるように前記合成樹脂材を前記封口板と一体に成形した密閉型電気化学デバイス用防爆装置であって、前記破断可能な薄膜部は前記周壁部の他方の端面から前記周壁部の一方の端面に向かって先細となる断面が三角形状の切り込みが形成されてできており、前記周壁部の一方の端面の外面の一部分に水分を遮断し破断可能な金属材でできたバリヤー部を設けて、前記バリヤー部により本体外から水分を本体内に透過させにくくするとともに前記本体内に発生したガスを本体内に蓄積させないように前記周壁部の一方の端面の外面の他の部分から透過させて本体外に排出するようにしているので、本体内の急激な内圧上昇時に前記薄膜部を破断させてガスを一気に排出することができるとともに本体外から水分を本体内に透過させにくくさせながら前記本体内に発生したガスを透過させて内圧上昇となるガスを本体内に蓄積しないようにすることができ、しかも、前記封口板と前記合成樹脂材とを一体に成形することにより、前記防爆装置用弁体を前記封口板に備える作業が簡単にできて生産性のよい防爆装置を提供することができるなどの効果がある。The explosion-proof device for a sealed electrochemical device of the present invention is used for a sealed electrochemical device such as a capacitor or a lithium battery having an electrolytic solution in a main body sealed with a sealing plate made of a metal material having a gas discharge hole. In the explosion-proof device, a peripheral wall part tightly joined to the gas discharge hole of the sealing plate and an annular flange part tightly joined to both surfaces of the sealing plate extending in a direction crossing the peripheral wall part at both ends of the peripheral wall part And a synthetic explosion-proof valve body formed of a gas-permeable synthetic resin material comprising a gas-permeable synthetic resin material having a gas discharge hole in the sealing plate closed. An explosion-proof device for a sealed electrochemical device in which a resin material is molded integrally with the sealing plate , wherein the breakable thin film portion is tapered from the other end surface of the peripheral wall portion toward one end surface of the peripheral wall portion. The cross section becomes a triangular cut Inclusive are made is formed, the cut off water to a portion of the outer surface of one end surface of the peripheral wall portion provided with a barrier portion made of breakable metal material, moisture within the body from outside the body by the barrier section Since the gas generated in the main body is difficult to permeate and is not allowed to accumulate in the main body, it is transmitted from the other part of the outer surface of one end surface of the peripheral wall portion and discharged out of the main body . When the internal pressure is suddenly increased, the thin film can be broken and gas can be discharged at once, and the internal pressure is increased by permeating the gas generated inside the main body while making it difficult for moisture to permeate into the main body. The gas for the explosion proof device is provided in the sealing plate by integrally molding the sealing plate and the synthetic resin material. Work such an effect it is possible to provide a good explosion-proof equipment productivity and easy.

本発明の実施形態１で封口板に形成した防爆装置の断面図である。It is sectional drawing of the explosion-proof apparatus formed in the sealing board in Embodiment 1 of this invention. 同上で、封口板に形成した防爆装置の平面図である。It is a top view of the explosion-proof device formed in the sealing board same as the above. 同上で、電極端子と並設した防爆装置を示す断面図である。It is sectional drawing which shows the explosion-proof apparatus provided in parallel with the electrode terminal same as the above. 本発明の実施形態２で封口板に形成した防爆装置の断面図である。It is sectional drawing of the explosion-proof apparatus formed in the sealing board in Embodiment 2 of this invention. 同上で、封口板に形成した防爆装置の平面図である。It is a top view of the explosion-proof device formed in the sealing board same as the above. 同上で、封口板に形成した防爆装置の背面図である。It is a rear view of the explosion-proof device formed in the sealing board same as the above. 本発明の実施形態３で封口板に形成した防爆装置の断面図である。It is sectional drawing of the explosion-proof apparatus formed in the sealing board in Embodiment 3 of this invention. 同上で、封口板に形成した防爆装置の平面図である。It is a top view of the explosion-proof device formed in the sealing board same as the above. 本発明の実施形態４で封口板に形成した防爆装置の断面図である。It is sectional drawing of the explosion-proof apparatus formed in the sealing board in Embodiment 4 of this invention. 同上で、封口板に形成した防爆装置の平面図である。It is a top view of the explosion-proof device formed in the sealing board same as the above.

以下、本発明の実施形態について図面を参照して説明する。Embodiments of the present invention will be described below with reference to the drawings.

（実施形態１）
図１から図３を参照して、ガス排出用孔１１を有し金属材でできた封口板１と合成樹脂材とを一体に成形することにより、封口板１のガス排出用孔１１の周壁に密着接合させる周壁部２１と周壁部２１の一方の端面２４にあってガス排出用孔１１を閉塞する破断可能な薄膜部２２とを有する防爆装置用弁体２を備え、薄膜部２２を含み端面２４の外面の一部分に水分を遮断し破断可能なバリヤー部を形成して密閉型電気化学デバイスの本体外から水分を前記本体内に透過させにくくし、ガスを排出するようにする機能をもたせた密閉型電気化学デバイス用防爆装置を説明する。(Embodiment 1)
With reference to FIGS. 1 to 3, the peripheral wall of the gas discharge hole 11 of the sealing plate 1 is formed by integrally forming the sealing plate 1 having a gas discharge hole 11 made of a metal material and a synthetic resin material. A valve body 2 for an explosion-proof device having a peripheral wall portion 21 to be tightly bonded to and a ruptureable thin film portion 22 on one end face 24 of the peripheral wall portion 21 that closes the gas discharge hole 11, and includes the thin film portion 22. Provide a function of blocking moisture and forming a breakable barrier portion on a part of the outer surface of the end face 24 to make it difficult for moisture to permeate from the outside of the main body of the sealed electrochemical device into the main body and to discharge gas. An explosion-proof device for a sealed electrochemical device will be described.

封口板１はアルミニウム（その合金を含む）やステンレスなどの金属材でできており、図３においては、その形状を矩形状として、開口端のある直方体状の箱型ケース１０を閉蓋する形状を例示するが、この封口板１の形状は、円板（楕円を含む）状で、開口端のある円筒状の箱型ケースを閉蓋する形状でもよい。The sealing plate 1 is made of a metal material such as aluminum (including an alloy thereof) or stainless steel. In FIG. 3, the shape is rectangular, and the rectangular box-shaped case 10 having an open end is closed. However, the shape of the sealing plate 1 may be a disc (including an ellipse) and may be a shape that closes a cylindrical box-shaped case having an open end.

防爆装置用弁体２は水素ガスや炭酸ガスなどのガスを透過する合成樹脂材でできており、この金属材でできた封口板１を成形型にて一体成形することにより封口板１に形成される。防爆装置用弁体２は、周壁部２１と、この周壁部２１の両端には周壁部２１を交叉する方向に延出した環状鍔部を有する端面２４、２５とを有し、端面２４の外面には凹所２６が形成されており、周壁部２１の端面２５から端面２４に向かって先細となる断面が三角形状に形成された破断促進用の切り込み２３により端面２４には薄膜部２２が形成されている。この場合、防爆装置用弁体２の形状は円筒を例示しているが角筒でもよい。また、防爆装置用弁体２の合成樹脂材としては、ポリエチレン系樹脂、ポリプロピレン系樹脂、ポリスチレン系樹脂、ポリカーボネート系樹脂、ポリ塩化ビニル系樹脂、ポリエチレンテレフタレート系樹脂、ポリブチレンテレフタレート系樹脂、ポリエチレンナフタレート系樹脂、ポリブチレンナフタレート系樹脂、フッ素系樹脂、ポリエーテルエーテルケトン系樹脂などの熱可塑性樹脂が例示できる。これらの合成樹脂材を成形型で封口板１と一体成形することにより、封口板１の両面には、防爆装置用弁体２が周壁部２１の端面２４、２５の環状鍔部にて密着接合されている。また、封口板１のガス排出用孔１１には、防爆装置用弁体２の周壁部２１が密着接合されるとともに、防爆装置用弁体２の破断可能な薄膜部２２により閉塞されている。この薄膜部２２の厚さは、本体内の急激な内圧上昇時に破断してガスを一気に排出されるように、０．０５〜０．２ｍｍの薄肉であり、その厚さはガス透過率の大きさや破断する圧力により設定すればよい。The explosion-proof valve body 2 is made of a synthetic resin material that allows gas such as hydrogen gas and carbon dioxide gas to pass therethrough . The sealing plate 1 made of this metal material is formed on the sealing plate 1 by integrally forming it with a molding die. Is done. The valve body 2 for the explosion-proof device has a peripheral wall portion 21 and end surfaces 24 and 25 having annular flanges extending in a direction crossing the peripheral wall portion 21 at both ends of the peripheral wall portion 21. A recess 26 is formed in the end surface 24, and a thin film portion 22 is formed on the end surface 24 by a break-promoting cut 23 having a triangular cross-section that is tapered from the end surface 25 toward the end surface 24 of the peripheral wall portion 21. Has been. In this case, the shape of the explosion-proof device valve body 2 is exemplified by a cylinder, but may be a square tube. The synthetic resin material for the valve body 2 for the explosion-proof device includes polyethylene resin, polypropylene resin, polystyrene resin, polycarbonate resin, polyvinyl chloride resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyethylene naphthalate. Examples thereof include thermoplastic resins such as phthalate resins, polybutylene naphthalate resins, fluorine resins, and polyether ether ketone resins . By integrally molding these synthetic resin materials with the sealing plate 1 with a molding die, the valve body 2 for the explosion-proof device is tightly bonded to both surfaces of the sealing plate 1 at the annular flanges of the end surfaces 24 and 25 of the peripheral wall portion 21. Has been. In addition, the peripheral wall portion 21 of the explosion-proof device valve body 2 is tightly joined to the gas discharge hole 11 of the sealing plate 1 and is closed by a breakable thin film portion 22 of the explosion-proof device valve body 2. The thickness of the thin film portion 22 is 0.05 to 0.2 mm so that the gas is discharged at a stroke by breaking when the internal pressure suddenly increases in the main body, and the thickness is large in gas permeability. What is necessary is just to set with the pressure which breaks.

水分を遮断する破断可能なバリヤー部３が、薄膜部２２を含むように端面２４の外面でその凹所２６を閉塞し、端面２４の環状鍔部の外面の一部分に接着剤を介して設けられている。このバリヤー部３の厚さは数μｍ〜１０数μｍで、素材としてはアルミニウム材などの金属材で、アルミニウム材であってもバリヤー部３は密閉型電気化学デバイスの本体外に配置されているので、電解液による腐食の影響は回避できる。バリヤー部３は、好ましくは、アルミニウム箔の箔押し（ホットスタンプ）により端面２４の外面に薄層を形成する。このようにして端面２４の外面に設けた水分を遮断するバリヤー部３は、密閉型電気化学デバイスの本体外から水分を本体内に透過させにくくし、かつ本体内の急激な内圧上昇時にガスを一気に排出できるように薄膜部２２とともに破断可能となっている。さらに、防爆装置用弁体２は水素ガスや炭酸ガスなどのガスを透過する合成樹脂材で封口板１と一体に成形してできており、端面２４の環状鍔部の外面の全面にはバリヤー部３が設けられていないので、密閉型電気化学デバイスの本体に発生した水素ガスや炭酸ガスなどのガスを透過することができる。なお、バリヤー部３が端面２４の外面に占める面積は、密閉型電気化学デバイスの本体外から水分を本体内に透過させにくくする量と、本体外にガスを排出するようにガスのみを透過させやすくする量との関係で、密閉型電気化学デバイスの使用に応じて、設定すればよい。A breakable barrier portion 3 for blocking moisture is provided on an outer surface of the end surface 24 so as to include the thin film portion 22 and the recess 26 is closed, and an adhesive is provided on a part of the outer surface of the annular flange portion of the end surface 24. ing. The barrier portion 3 has a thickness of several μm to several tens of μm, and is made of a metal material such as an aluminum material. Even if it is an aluminum material, the barrier portion 3 is disposed outside the main body of the sealed electrochemical device. Therefore, the influence of corrosion by the electrolyte can be avoided. The barrier part 3 preferably forms a thin layer on the outer surface of the end face 24 by hot stamping with an aluminum foil. Thus, the barrier portion 3 for blocking moisture provided on the outer surface of the end face 24 makes it difficult for moisture to permeate from the outside of the main body of the sealed electrochemical device into the main body, and allows gas to flow when the internal pressure in the main body suddenly increases. It can be broken together with the thin film portion 22 so that it can be discharged at once. Further, the valve body 2 for the explosion-proof device is formed integrally with the sealing plate 1 with a synthetic resin material that allows gas such as hydrogen gas and carbon dioxide gas to pass therethrough, and a barrier is formed on the entire outer surface of the annular flange portion of the end surface 24. Since the part 3 is not provided , gas such as hydrogen gas or carbon dioxide generated in the main body of the sealed electrochemical device can be transmitted. Note that the area occupied by the barrier portion 3 on the outer surface of the end surface 24 is such that the amount of moisture hardly penetrates from the outside of the main body of the sealed electrochemical device into the main body and allows only the gas to pass through so as to exhaust the gas outside the main body. What is necessary is just to set according to use of a sealed electrochemical device in relation to the quantity made easy.

次に、図３は、封口板１には電極端子挿入用孔１２がガス排出用孔１１と並設されており、電極端子挿入用孔１２には合成樹脂材でできたガスケット５２により電気的に絶縁された電極端子５１が形成されており、ガス排出用孔１１には図１および図２に示す防爆装置用弁体２を有する防爆装置が形成されており、この封口板１により封口された本体内に電解液８４を有するコンデンサーやリチウム電池などの密閉型電気化学デバイスを示す。Next, in FIG. 3, an electrode terminal insertion hole 12 is provided in parallel with the gas discharge hole 11 in the sealing plate 1, and the electrode terminal insertion hole 12 is electrically connected by a gasket 52 made of a synthetic resin material. The gas discharge hole 11 is formed with an explosion-proof device having the explosion-proof device valve body 2 shown in FIGS. 1 and 2, and is sealed by the sealing plate 1. 2 shows a sealed electrochemical device such as a capacitor or a lithium battery having an electrolytic solution 84 in the main body.

封口板１は前述のようにアルミニウム（その合金を含む）やステンレスなどの金属材でできており、ガス抜き用孔１１と電極端子挿入用孔１２とが並設するように形成されており、電極端子挿入用孔１２は中央位置に形成されているが、ガス抜き用孔１１が中央位置に形成されていてもよい。この電極端子挿入用孔１２には正極端子である端子部５が配置するように設けられており、端子部５は銅（その合金を含む）やアルミニウム（その合金を含む）などでできた電極端子５１を有し、電極端子５１は合成樹脂材でできたガスケット５２にて電気的に絶縁されている。電極端子５１はガスケット５２と密着接合させる必要があり、電極端子５１をガスケット５２に挿入してかしめて封口板１に密着接合するように固着されてもよいが、電極端子５１とガスケット５２と封口板１とを確実に密着接合させるために、ガスケット５２の合成樹脂材を防爆装置用弁体２の合成樹脂材と同じ素材とし、防爆装置用弁体２を成形型で封口板１と一体に成形する際に、電極端子５１とガスケット５２と封口板１とを同時に成形することが好ましい。この場合も防爆装置用弁体２は水素ガスや炭酸ガスなどのガスを透過する合成樹脂材で封口板１と一体に成形してできており、端面２４の環状鍔部の外面の全面にはバリヤー部３が設けられていないので、密閉型電気化学デバイスの本体に発生した水素ガスや炭酸ガスなどのガスを透過することができる。 The sealing plate 1 is made of a metal material such as aluminum (including an alloy thereof) or stainless steel as described above, and is formed so that the gas vent hole 11 and the electrode terminal insertion hole 12 are juxtaposed. Although the electrode terminal insertion hole 12 is formed at the center position, the gas vent hole 11 may be formed at the center position. The electrode terminal insertion hole 12 is provided with a terminal portion 5 which is a positive electrode terminal, and the terminal portion 5 is an electrode made of copper (including its alloy) or aluminum (including its alloy). A terminal 51 is provided, and the electrode terminal 51 is electrically insulated by a gasket 52 made of a synthetic resin material. The electrode terminal 51 needs to be tightly joined to the gasket 52, and the electrode terminal 51 may be inserted into the gasket 52 and caulked to be tightly joined to the sealing plate 1, but the electrode terminal 51, gasket 52, and sealing In order to securely bond the plate 1 to the plate 1, the synthetic resin material of the gasket 52 is made of the same material as the synthetic resin material of the valve body 2 for the explosion-proof device, and the valve body 2 for the explosion-proof device is integrated with the sealing plate 1 with a mold. When molding, it is preferable to mold the electrode terminal 51, the gasket 52, and the sealing plate 1 simultaneously. Also in this case , the valve body 2 for the explosion-proof device is formed integrally with the sealing plate 1 with a synthetic resin material that allows gas such as hydrogen gas and carbon dioxide gas to pass through. Since the barrier part 3 is not provided, gas such as hydrogen gas or carbon dioxide generated in the main body of the sealed electrochemical device can be transmitted.

防爆装置２および端子部５を有する封口板１を開口端のあるアルミニウム（その合金を含む）やステンレスなどの金属材でできた箱型ケース１０と組み合わせて、箱型ケース１０を閉蓋するようにレーザなどの接合手段９にて接合して密閉された密閉型電気化学デバイスの本体が形成されている。このように封口板１で封口された本体内にはリード８２、８３、正負極素子部８１および電解液８４が気密状態に設けられている。端子部５はリード８２を介して正負極素子部８１と接続されており、封口板１はリード８３を介して正負極素子部８１と接続されている。なお、この封口板１には正極端子と負極端子の何れか一方の端子例えば正極端子を設けた場合を示すが、正極端子と負極端子の両方の端子を設けてあってもよい。The sealing plate 1 having the explosion-proof device 2 and the terminal portion 5 is combined with a box-type case 10 made of a metal material such as aluminum (including its alloy) or stainless steel having an open end so as to close the box-type case 10. A main body of a sealed electrochemical device is formed which is bonded and sealed by a bonding means 9 such as a laser. In this manner, the leads 82 and 83, the positive and negative electrode element portions 81, and the electrolytic solution 84 are provided in an airtight state in the main body sealed by the sealing plate 1. The terminal portion 5 is connected to the positive / negative electrode element portion 81 via a lead 82, and the sealing plate 1 is connected to the positive / negative electrode element portion 81 via a lead 83. In addition, although the case where either one of a positive electrode terminal and a negative electrode terminal, for example, a positive electrode terminal is provided in this sealing plate 1 is shown, both the positive electrode terminal and the negative electrode terminal may be provided.

このように金属材でできた封口板１に防爆装置用弁体２を有する防爆装置が形成されており、本体内の急激な内圧上昇時にガスを一気に排出するとともに内圧上昇となるガスを本体内に蓄積させないように本体外に排出する機能をもたせて、生産性のよい防爆装置を提供することができる。In this way, an explosion-proof device having the explosion-proof device valve body 2 is formed on the sealing plate 1 made of a metal material. When the internal pressure suddenly increases in the main body, the gas is discharged at once and the gas that increases the internal pressure is discharged into the main body. It is possible to provide an explosion-proof device with good productivity by providing a function of discharging outside the main body so as not to accumulate.

（実施形態２）
図４から図６は、実施形態１に示す密閉型電気化学デバイスと同様な構成で、防爆装置用弁体２に代えて、防爆装置用弁体４を有する防爆装置の異なる実施形態を示し、以下説明する。(Embodiment 2)
FIGS. 4 to 6 show different embodiments of the explosion-proof device having the explosion-proof device valve body 4 in place of the explosion-proof device valve body 2 in the same configuration as the sealed electrochemical device shown in the first embodiment. This will be described below.

防爆装置用弁体４は、実施形態１と同様な水素ガスや炭酸ガスなどのガスを透過する合成樹脂材で、金属材でできた封口板１を成形型にて一体成形することにより封口板１に形成されてできている。防爆装置用弁体４は、周壁部４１と、この周壁部４１の両端から周壁部４１を交叉する方向に延出した環状鍔部を有する端面４４、４５とを有し、周壁部４１の端面４５から端面４４に向かって先細となる断面が三角形状の環状の破断促進用の切り込み４３により周壁部４１の一方の端面４４には薄膜部４２が形成されている。実施形態１と異なる部分は、破断促進用の切り込み４３の形状が環状であり、その外面は平担で凹所は形成されていない形状である。なお、バリヤー部３は、実施形態１と同様な水分を遮断する材質で、薄膜部４２を含むように端面４４の外面の一部分に、接着剤を介して設けられており、水分を遮断しかつ破断可能とするとともに内圧上昇となるガスを本体内に蓄積させないように本体外に排出する機能をもたせている。The valve body 4 for the explosion-proof device is a synthetic resin material that is permeable to gases such as hydrogen gas and carbon dioxide gas as in the first embodiment, and the sealing plate 1 made of a metal material is integrally formed with a molding die to form a sealing plate. 1 is formed. The explosion-proof device valve body 4 includes a peripheral wall portion 41 and end faces 44 and 45 having annular flanges extending in a direction crossing the peripheral wall portion 41 from both ends of the peripheral wall portion 41. A thin film portion 42 is formed on one end surface 44 of the peripheral wall portion 41 by an annular breakage-promoting cut 43 having a triangular cross section that tapers from 45 to the end surface 44. The part different from the first embodiment is that the shape of the cut 43 for promoting breakage is annular, and the outer surface is flat and has no recess. The barrier portion 3 is made of the same material that blocks moisture as in the first embodiment. The barrier portion 3 is provided on a part of the outer surface of the end face 44 so as to include the thin film portion 42 via an adhesive. A function of allowing gas to be broken and exhausting the internal pressure to the outside of the main body is provided so as not to accumulate in the main body.

この実施形態２における防爆装置用弁体４を有する防爆装置は、封口板１の電極端子挿入用孔１２が並設されたガス排出用孔１１に形成されて、実施形態１の図３に示すコンデンサーやリチウム電池などの密閉型電気化学デバイスに使用することにより、本体内の急激な内圧上昇時にガスを一気に排出するとともに内圧上昇となるガスを本体内に蓄積させないように本体外に排出する機能をもたせて、生産性のよい防爆装置を提供することができる。The explosion-proof device having the explosion-proof device valve body 4 in the second embodiment is formed in the gas discharge hole 11 in which the electrode terminal insertion holes 12 of the sealing plate 1 are arranged side by side, and is shown in FIG. 3 of the first embodiment. A function that discharges gas at a stretch when the internal pressure suddenly rises inside the main body and discharges the gas that increases the internal pressure outside the main body so that it does not accumulate inside the main body by using it in a sealed electrochemical device such as a capacitor or lithium battery It is possible to provide an explosion-proof device with good productivity.

（実施形態３）
図７および図８は、実施形態１に示す密閉型電気化学デバイスと同様な構成で、防爆装置用弁体２に代えて、防爆装置用弁体６を有する防爆装置の異なる実施形態を示し、以下説明する。(Embodiment 3)
7 and 8 show different embodiments of an explosion-proof device having an explosion-proof device valve body 6 instead of the explosion-proof device valve body 2 in the same configuration as the sealed electrochemical device shown in the first embodiment. This will be described below.

防爆装置用弁体６は、実施形態１と同様な水素ガスや炭酸ガスなどのガスを透過する合成樹脂材で、金属材でできた封口板１を成形型にて一体成形することにより封口板１に形成されてできている。防爆装置用弁体６は、周壁部６１と、この周壁部６１の上端の端面６４と、周壁部６１の下端で周壁部６１を交叉する方向に延出した環状鍔部を有する端面６５と、端面６５から端面６４に向かって先細となって端面６４の途中まで形成した断面台形状の空間部６６とを有し、空間部６６の底面から端面６４に向かって先細となる断面が三角形状に形成された破断促進用の切り込み６３により周壁部６１の一方の端面６４には薄膜部６２が形成されている。防爆装置用弁体６において実施形態１と異なる部分は、周墜部６１の端面６４に環状鍔部を有さない形状である。一方、水分を遮断するバリヤー部３０は、実施形態１と同様な水分を遮断する材質で、薄膜部６２を含み端面６４の一部分の外面に接着剤を介して設けられている。この場合、バリヤー部３０は、薄膜部６２の破断時に破断しやすいようにするとともに０．１〜１０μｍの複数の微細孔パターンを有し、この端面で水素ガスや炭酸ガスなどのガスを透過する合成樹脂材の本体外への露出面積を確保している。このバリヤー部３０は、好ましくは、アルミニウム箔をもちい、前記微細孔パターンを有するように箔押し（ホットスタンプ）により薄層となるようにしている。なお、この微細孔が占有する面積は、密閉型電気化学デバイスの本体外から水分を本体内に透過させにくくする量と、本体外にガスを排出するようにガスのみを透過させやすくする量との関係で、密閉型電気化学デバイスの使用に応じて、設定すればよい。The valve body 6 for the explosion-proof device is a synthetic resin material that is permeable to gas such as hydrogen gas and carbon dioxide gas as in the first embodiment, and the sealing plate 1 made of a metal material is integrally formed with a molding die to form a sealing plate. 1 is formed. The valve body 6 for the explosion-proof device includes a peripheral wall portion 61, an end surface 64 at the upper end of the peripheral wall portion 61, an end surface 65 having an annular flange extending in a direction crossing the peripheral wall portion 61 at the lower end of the peripheral wall portion 61, A space portion 66 having a trapezoidal cross section that is tapered from the end surface 65 toward the end surface 64 and formed in the middle of the end surface 64, and has a triangular cross section that tapers from the bottom surface of the space portion 66 toward the end surface 64. A thin film portion 62 is formed on one end face 64 of the peripheral wall portion 61 by the formed cuts 63 for promoting breakage. The portion different from the first embodiment in the valve body 6 for the explosion-proof device is a shape that does not have an annular flange on the end face 64 of the peripheral flange 61. On the other hand, the barrier portion 30 that blocks moisture is made of the same material that blocks moisture as in the first embodiment, and includes the thin film portion 62 and is provided on the outer surface of a part of the end face 64 via an adhesive. In this case, the barrier portion 30 is easy to break when the thin film portion 62 is broken, and has a plurality of fine pore patterns of 0.1 to 10 μm, and gas such as hydrogen gas and carbon dioxide gas permeates through this end face. The exposed area outside the main body of the synthetic resin material is secured. The barrier portion 30 is preferably made of an aluminum foil and is formed into a thin layer by foil pressing (hot stamping) so as to have the fine hole pattern. The area occupied by the micropores is an amount that makes it difficult for moisture to permeate into the main body from outside the main body of the sealed electrochemical device, and an amount that makes only gas easily permeate so that the gas is discharged out of the main body. Therefore, it may be set according to the use of the sealed electrochemical device.

この実施形態３における防爆装置用弁体６を有する防爆装置は、ガス排出用孔１１が電極端子挿入用孔１２に並設された封口板１に形成して、実施形態１の図３に示すコンデンサーやリチウム電池などの密閉型電気化学デバイスに使用することにより、本体内の急激な内圧上昇時にガスを一気に排出するとともに内圧上昇となるガスを本体内に蓄積させないように本体外に排出する機能をもたせて、生産性のよい防爆装置を提供することができる。The explosion-proof device having the valve body 6 for the explosion-proof device according to the third embodiment is shown in FIG. 3 of the first embodiment, in which the gas discharge hole 11 is formed in the sealing plate 1 arranged in parallel with the electrode terminal insertion hole 12. A function that discharges gas at a stretch when the internal pressure suddenly rises inside the main body and discharges the gas that increases the internal pressure outside the main body so that it does not accumulate inside the main body by using it in a sealed electrochemical device such as a capacitor or lithium battery It is possible to provide an explosion-proof device with good productivity.

（実施形態４）
図９および図１０は、実施形態１に示す密閉型電気化学デバイスと同様な構成で、防爆装置用弁体２に代えて、防爆装置用弁体７を有する防爆装置の異なる実施形態を示し、以下説明する。(Embodiment 4)
9 and 10 show different embodiments of an explosion-proof device having an explosion-proof device valve body 7 instead of the explosion-proof device valve body 2 in the same configuration as the sealed electrochemical device shown in the first embodiment. This will be described below.

防爆装置用弁体７は、実施形態１と同様な水素ガスや炭酸ガスなどのガスを透過する合成樹脂材で、金属材でできた封口板１を成形型にて一体成形することにより封口板１に形成されてできている。防爆装置用弁体７は、周壁部７１と、この周壁部７１の両端から周壁部７１を交叉する方向に延出した環状鍔部を有する端面７４、７５と、端面７５から端面７４に向かって先細となって端面７４の途中まで形成した断面台形状の空間部７６とを有し、空間部７６の底面から端面７４に向かって先細となる断面が三角形状の破断促進用の切り込み７３により、周壁部７１の一方の端面７４には薄膜部７２が形成されている。バリヤー部３１は、周壁部７１の端面７４の外面に接着剤を介して設けられるように第１のバリヤー部３１Ａと第２のバリヤー部３１Ｂとからなり、実施形態１と同様な水分を遮断する材質でできている。第１のバリヤー部３１Ａと第２のバリヤー部３１Ｂとは端面７４の外面でその端面７４が露出したバリヤー切除部７７ができるように離間しており、第１のバリヤー部３１Ａは端面７４の薄膜部７２を含む部分の外面にあり、第２のバリヤー部３１Ｂは端面７４の環状鍔部の外面、すなわち、バリヤー部３１は、薄膜部７２を含み端面７４の外面の一部分に形成されている。この場合、第１のバリヤー部３１Ａと第２のバリヤー部３１Ｂとは水分を遮断する材質であるが、第１のバリヤー部３１Ａは薄膜部７２の破断時に破断可能となることが必要である。なお、バリヤー部３１が端面７４の外面に占める面積は、密閉型電気化学デバイスの本体外から水分を本体内に透過させにくくする量と、本体外にガスを排出するようにガスのみを透過させやすくする量との関係で、密閉型電気化学デバイスの使用に応じて、設定すればよい。The valve body 7 for the explosion-proof device is a synthetic resin material that is permeable to gases such as hydrogen gas and carbon dioxide gas as in the first embodiment, and the sealing plate 1 made of a metal material is integrally formed with a molding die to form a sealing plate. 1 is formed. The explosion-proof device valve body 7 includes end surfaces 74 and 75 having a peripheral wall portion 71 and annular flanges extending in a direction crossing the peripheral wall portion 71 from both ends of the peripheral wall portion 71, and from the end surface 75 toward the end surface 74. A space 76 having a trapezoidal cross section that is tapered and formed in the middle of the end surface 74, and has a triangular cross section that tapers from the bottom surface of the space 76 toward the end surface 74 by a break-promoting cut 73. A thin film portion 72 is formed on one end surface 74 of the peripheral wall portion 71. The barrier portion 31 includes a first barrier portion 31A and a second barrier portion 31B so as to be provided on the outer surface of the end surface 74 of the peripheral wall portion 71 via an adhesive, and blocks moisture similar to that in the first embodiment. Made of material. The first barrier portion 31A and the second barrier portion 31B are separated from each other so as to form a barrier cutout portion 77 where the end surface 74 is exposed on the outer surface of the end surface 74. The first barrier portion 31A is a thin film on the end surface 74. The second barrier portion 31B is formed on the outer surface of the annular flange portion of the end surface 74, that is, the barrier portion 31 is formed on a part of the outer surface of the end surface 74 including the thin film portion 72. In this case, the first barrier portion 31A and the second barrier portion 31B are materials that block moisture, but the first barrier portion 31A needs to be able to be broken when the thin film portion 72 is broken. Note that the area occupied by the barrier portion 31 on the outer surface of the end face 74 is an amount that makes it difficult for moisture to permeate from the outside of the main body of the sealed electrochemical device into the main body, and allows only the gas to permeate so that the gas is discharged out of the main body. What is necessary is just to set according to use of a sealed electrochemical device in relation to the quantity made easy.

この実施形４における防爆装置用弁体７を有する防爆装置は、ガス排出用孔１１が電極端子挿入用孔１２に並設された封口板１に形成して、実施形態１の図３に示すコンデンサーやリチウム電池などの密閉型電気化学デバイスに使用することにより、本体内の急激な内圧上昇時にガスを一気に排出するとともに内圧上昇となるガスを本体内に蓄積させないように本体外に排出する機能をもたせて、生産性のよい防爆装置を提供することができる。The explosion-proof device having the valve body 7 for the explosion-proof device according to the fourth embodiment is shown in FIG. 3 of the first embodiment, in which the gas discharge hole 11 is formed in the sealing plate 1 arranged in parallel with the electrode terminal insertion hole 12. A function that discharges gas at a stretch when the internal pressure suddenly rises inside the main body and discharges the gas that increases the internal pressure outside the main body so that it does not accumulate inside the main body by using it in a sealed electrochemical device such as a capacitor or lithium battery It is possible to provide an explosion-proof device with good productivity.

本発明の封口板は、ガス排出用孔を有し金属材でできており、その封口板により封口された本体内に電解液を有するコンデンサーやリチウム電池などの密閉型電気化学デバイス、特に非水素電解液の密閉型電気化学デバイスにおいて、その本体内で発生する水素ガスにより本体が膨れるのを抑制し充放電サイクル特性を向上させる防爆装置として有用である。The sealing plate of the present invention has a gas discharge hole and is made of a metal material, and is a sealed electrochemical device such as a capacitor or a lithium battery having an electrolytic solution in the main body sealed by the sealing plate, particularly a non-hydrogen In a sealed electrochemical device of an electrolytic solution, it is useful as an explosion-proof device that suppresses swelling of the main body due to hydrogen gas generated in the main body and improves charge / discharge cycle characteristics.

１ 封口板
１１ ガス抜き用孔
２、４、６、７ 防爆装置用弁体
２２、４２、６２、７２ 薄膜部
３、３０、３１ バリヤー部DESCRIPTION OF SYMBOLS 1 Sealing plate 11 Degassing hole 2, 4, 6, 7 Explosion-proof device valve body 22, 42, 62, 72 Thin film part 3, 30, 31 Barrier part

Claims (2)

ガス排出用孔を有し金属材でできた封口板により封口された本体内に電解液を有するコンデンサーやリチウム電池などの密閉型電気化学デバイス用防爆装置において、前記封口板のガス排出用孔に密着接合された周壁部と前記周壁部の両端で前記周壁部を交叉する方向に延出して前記封口板の両面に密着接合された環状鍔部と前記封口板のガス排出用孔を閉塞させた破断可能な薄膜部とからなるガスの透過性のある合成樹脂材で成形してできた筒状の防爆装置用弁体となるように前記合成樹脂材を前記封口板と一体に成形した密閉型電気化学デバイス用防爆装置であって、前記破断可能な薄膜部は前記周壁部の他方の端面から前記周壁部の一方の端面に向かって先細となる断面が三角形状の切り込みが形成されてできており、前記周壁部の一方の端面の外面の一部分に水分を遮断し破断可能な金属材でできたバリヤー部を設けて、前記バリヤー部により本体外から水分を本体内に透過させにくくするとともに前記本体内に発生したガスを本体内に蓄積させないように前記周壁部の一方の端面の外面の他の部分から透過させて本体外に排出するようにしたことを特徴とする密閉型電気化学デバイス用防爆装置。In an explosion-proof device for a closed-type electrochemical device such as a capacitor or a lithium battery having an electrolyte solution in a body sealed by a sealing plate made of a metal material having a gas discharging hole, the gas discharging hole of the sealing plate The peripheral wall part tightly joined and the annular wall part tightly joined to both surfaces of the sealing plate and the gas discharge hole of the sealing plate are closed by extending in a direction crossing the peripheral wall part at both ends of the peripheral wall part. A hermetic mold in which the synthetic resin material is molded integrally with the sealing plate so as to be a cylindrical valve body for an explosion-proof device formed by molding a gas-permeable synthetic resin material composed of a breakable thin film portion. An explosion-proof device for an electrochemical device , wherein the breakable thin film portion is formed by forming a triangular cut in a tapering section from the other end surface of the peripheral wall portion toward one end surface of the peripheral wall portion. cage, one of the peripheral wall portion And a barrier unit made provided with moisture to block the a portion of the outer surface of the end face rupturable metallic material, the gas generated within said main body with hardly water from outside the body is transmitted into the body by the barrier section An explosion-proof device for a sealed electrochemical device, wherein the explosion-proof device for a sealed electrochemical device is made to permeate from another portion of the outer surface of one end face of the peripheral wall portion and be discharged out of the main body so as not to accumulate in the body . 前記周壁部の一方の端面には凹所が形成されており、前記破断可能な薄膜部は前記周壁部の他方の端面から前記凹所に向かって先細となる断面が三角形状の切り込みが形成されてできており、前記周壁部の一方の端面の外面の一部分に前記薄膜部を含むように前記凹所を閉塞して本体外から水分を本体内に透過させにくくするとともに前記本体内に発生したガスを本体内に蓄積させないように前記周壁部の一方の端面の外面の他の部分から透過させて本体外に排出するようにしたことを特徴とする請求項１に記載の密閉型電気化学デバイス用防爆装置。 A recess is formed in one end surface of the peripheral wall portion, and the breakable thin film portion is formed with a notch having a triangular cross section that tapers from the other end surface of the peripheral wall portion toward the recess. The recess is closed so that the thin film portion is included in a part of the outer surface of one end surface of the peripheral wall portion to make it difficult for moisture to permeate from the outside of the main body into the main body and is generated in the main body. 2. The hermetic electrochemical device according to claim 1 , wherein gas is allowed to permeate from another portion of the outer surface of one end face of the peripheral wall portion so as not to accumulate in the main body and is discharged outside the main body. Explosion-proof device.
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