JP2005210073A - Pressure release valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure release valve 11 that restricts entering of dust or ejection of contents such as electrolyte, the pressure release valve 11 being provided in a sealing plate for a condenser or capacitor and opening to release pressure when pressure in a pressure vessel exceeds a predetermined value. <P>SOLUTION: A space 12 for attaching a valve having a shape that opens at an inner side of a pressure vessel and closes at an outer side thereof in a sealing plate 4, and a valve body 19 forming a valve body of a pressure release valve 11 is disposed in the space 12. A communication hole 15 is provided in a partition wall 13 for partitioning between the space 12 and the outside of the vessel. To prevent shift of the valve body 19 due to pressure and the like, a step-like engaging portions 16, 17 are provided on the inside of the space 12, or stay-like engaging portions are provided on the periphery of the valve body 19. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pressure release valve which is provided on a sealing plate of a pressure vessel such as a capacitor or a capacitor and opens when the sealing pressure in the pressure vessel exceeds a predetermined value to release the pressure.

  In a sealed aluminum electrolytic capacitor, an electric double layer capacitor, or the like, the opening of a pressure vessel that houses the element body is closed by a sealing plate that is sealed via a gasket. If such a completely sealed structure is used, when a sudden load is applied, the internal pressure of the container increases due to Joule heat generation, which may cause a decrease in the function and lifetime of the capacitor. For this reason, conventionally, the bottom of the pressure vessel is cut into a rupture plate, or the pressure vessel is prevented from rupture by attaching a rubber cap to the lid as a safety valve, or a sealing plate Further, for example, by applying a water repellent treatment to a porous film made of PTFE or the like, a gas is permeated but a liquid is impermeable, and a breather that serves to release the internal pressure of the container to the outside is attached and generated inside the container. The one that can release the gas pressure has been developed.

  According to the prior art, when a rupturable plate or a safety valve is used as the sealing plate, once the container is ruptured, it cannot be used thereafter, and therefore cannot be used repeatedly.

  In addition, the breather provided on the sealing plate has a function of keeping the internal pressure of the pressure vessel constant and preventing leakage of the encapsulated liquid such as an electrolyte, but even with heat and internal pressure generated in a normal use state, Since the gas in the container is slightly released from the breather, the electrolytic solution is likely to be reduced by evaporation, and water vapor from outside tends to enter. Further, in a poor environment, the breather porous membrane may be clogged, making it difficult to expect stable performance. Also, since the breather cannot cope with a sudden increase in internal pressure, it is necessary to provide an explosion-proof valve to release the internal pressure instantly and prevent the container from exploding when the internal pressure exceeds a predetermined value. there were.

  Therefore, the oil seal type pressure release valve 51 of FIG. 10 previously proposed by the applicant of the present application has a configuration in which only one lip seal 54 is assembled to the sealing plate 52 provided with the valve mounting space 53. A valve device that is easy to assemble and has high operational reliability (see Patent Document 1).

  However, since the pressure release valve 51 is disposed in the valve mounting space 53 opened on the upper surface (the container exterior A side) of the sealing plate 52 as shown in the figure, it is used in a situation where it is exposed to the external environment. become. Further, since the capacitor or capacitor to which the pressure release valve 51 is attached is often installed in a direction (vertical or oblique) with the valve mounting space 53 on the upper side, dust in the atmosphere is placed on the pressure release valve 51. There is a possibility of deposition and adhesion. When these dusts enter the valve body 55 that functions as a valve body, the valve opening characteristics are impaired, and the accumulated / attached dust creates a gap between the valve body 55 and the shaft portion 56. There is a risk that the internal electrolyte may leak or steam.

  Further, since the valve main body 55 is opened to the outside, the electrolytic solution adhering to the vicinity of the valve main body 55 is ejected to the outside along with the release of the internally generated gas when the valve is opened, and the vicinity of the pressure release valve 51 Furthermore, there is a possibility that the electrolytic solution adheres to the substrate or the bus bar, causing circuit corrosion or short circuit.

  In recent years, downsizing of capacitors, capacitors, and the like is required depending on the application, and accordingly, the sealing plate and the pressure release valve provided thereon are also required to be downsized and reduced in diameter. The sealing plate is generally molded as a resin molded product in which aluminum terminals are insert-molded. However, the resin molded product is inferior in dimensional accuracy compared to a machined product, and the smaller the diameter, the larger the dimensional tolerance ratio ( (± OO%) becomes large, and it is difficult to obtain an accurate fitting when the pressure release valve is mounted on the sealing plate. In other words, if the housing (sealing plate) has a large diameter tolerance on the + side and the pressure relief valve has a large outside diameter on the-side, a sufficient fitting allowance cannot be obtained, and as a result, leakage occurs in that part. There is a possibility that will occur.

  Further, when an ejection prevention layer such as a mist trap or a gas-liquid separation membrane is attached to the pressure release valve, these sizes are also reduced, making handling (handling) in the manufacturing process difficult.

  Furthermore, when an internal pressure is applied with the pressure release valve attached from the inside of the housing (sealing plate), if the fit between the pressure release valve and the housing is loose, the pressure release valve moves to the atmosphere side. When the pressure release valve moves to the atmosphere side, the opening area of the vent hole is reduced, and there is a possibility that a sufficient ventilation amount cannot be obtained when the valve is opened.

International Publication No. WO03 / 044397A1 Pamphlet

In view of the above points, the present invention can effectively suppress the intrusion of external dust or the discharge of internal contents such as an electrolyte, and further improve the prior art from these points. An object of the present invention is to provide a pressure relief valve capable of
In addition to the above, there is provided a pressure relief valve capable of normally opening and closing without the valve body of the pressure relief valve moving due to pressure or the like in the valve mounting space provided in the sealing plate. With the goal.
In addition, it provides a pressure relief valve that has excellent sealing properties with the sealing plate, and is easy to handle even if the mist trap or gas-liquid separation membrane becomes smaller as the sealing plate becomes smaller. The purpose is to do.

  In order to achieve the above object, a pressure release valve according to claim 1 of the present invention is provided on a sealing plate of a pressure vessel and opens when the pressure in the pressure vessel exceeds a predetermined value to release the pressure. In the pressure release valve, a valve mounting space having a shape that opens on the inner side of the pressure vessel and closes the outer side is provided in the sealing plate, and the valve that forms the valve body of the pressure release valve in the valve mounting space The main body is disposed, and a communication hole is provided in a partition wall that partitions the valve mounting space and the outside of the pressure vessel.

  The pressure relief valve according to claim 2 of the present invention is the pressure relief valve according to claim 1, wherein the pressure relief valve engages with the valve body on the inner peripheral surface of the valve mounting space that opens to the inside of the pressure vessel. An engaging portion made of a step or the like that suppresses movement of the valve main body toward the inside of the pressure vessel is provided.

  The pressure relief valve according to claim 3 of the present invention is the pressure relief valve according to claim 1 or 2, wherein the valve body is engaged with the inner peripheral surface of the valve mounting space opened to the inside of the pressure vessel. The valve main body is provided with an engaging portion made up of a step or the like that suppresses the movement of the valve body toward the partition wall.

  The pressure relief valve according to claim 4 of the present invention is the pressure relief valve according to claim 1 or 2, wherein the valve body is separated from the outer peripheral portion of the valve body by engaging the engagement surface of the sealing plate. An engaging portion made of a stay or the like that suppresses movement to the wall side is provided.

  The pressure release valve according to claim 5 of the present invention is the pressure release valve according to claim 4 described above, wherein either the engagement portion made of a stay or the like and the engagement surface of the sealing plate engaged with the engagement portion are provided. One or both is provided with a protruding seal portion made of a bead or the like.

  A pressure relief valve according to a sixth aspect of the present invention is the pressure relief valve according to any one of the first to fifth aspects, wherein the valve body disposed in the valve mounting space is on the atmosphere side or the pressure vessel inner side. In addition, an ejection preventing layer made of a mist trap or a gas-liquid separation membrane for preventing ejection of the internal contents is provided.

  Furthermore, the pressure relief valve according to claim 7 of the present invention is the pressure relief valve according to claim 6 described above, wherein an ejection preventing layer made of a mist trap or a gas-liquid separation membrane is provided on the inner end face of the pressure vessel in the valve body. An attachment guide for attachment is provided.

  As in the pressure release valve according to the first aspect of the present invention having the above-described configuration, a valve mounting space having a shape that opens to the inner side of the pressure vessel and closes the outer side is provided in the sealing plate, and the valve mounting space is provided in the valve mounting space. When the valve body constituting the valve body of the pressure release valve is arranged, a partition wall is arranged as a part of the sealing plate between the valve mounting space and the outside of the pressure vessel, and this partition wall acts as a shielding layer. It becomes possible to prevent dust outside the container from entering the valve mounting space, and to prevent the contents inside the container from being ejected outside the container when the valve is opened. However, if the valve mounting space and the outside of the container are completely shut off by the partition wall, the pressure relief valve will not be used. Therefore, the partition wall is provided with a communication hole having a minimum size.

  Further, when the valve mounting space is provided so as to open to the inner side of the pressure vessel in this way, the valve body is assembled from the inner side of the valve into the valve mounting space, and after the assembly, Since the side is opened, if a negative pressure is generated inside the container due to a temperature drop or the like, the negative pressure may cause the valve body to fall from the sealing plate into the container. In order to prevent this, there are conceivable methods of disposing a disc spring on the inside of the container of the valve body to support the valve body, or fixing the valve body by bonding, but according to these methods, the number of parts This increases the cost and makes the assembly process complicated. Therefore, in the pressure release valve according to claim 2 of the present invention, the valve main body moves to the inner side of the pressure vessel by engaging with the valve main body on the inner peripheral surface of the valve mounting space that opens to the inner side of the pressure vessel. An engagement portion made up of a step or the like for suppressing the valve main body is provided, and the valve main body is engaged with this engagement portion, thereby preventing the valve main body from falling off.

  On the other hand, when the pressure inside the container rises, there is a possibility that the valve body moves to the partition wall side due to this pressure and closes the through hole or narrows the opening area of the through hole. Accordingly, in the pressure relief valve according to claim 3 of the present invention, the valve body is prevented from moving toward the partition wall by engaging with the valve body on the inner peripheral surface of the valve mounting space that opens to the inside of the pressure vessel. An engaging portion made of a step or the like is provided, and the valve main body is engaged with the engaging portion to suppress the movement of the valve main body. Further, in the pressure relief valve according to claim 4 of the present invention, the engagement comprising a stay or the like that is engaged with the engagement surface of the sealing plate at the outer peripheral portion of the valve main body and suppresses the valve main body from moving to the partition wall side. A portion is provided, and the engagement portion is engaged with the sealing plate to suppress the movement of the valve body. Therefore, the engaging portion in the third or fourth aspect is provided in the opposite direction to the engaging portion in the second aspect.

  Further, like the pressure release valve according to claim 5 of the present invention, a protrusion made of a bead or the like on one or both of an engaging portion made of a stay or the like and an engaging surface of a sealing plate engaged with the engaging portion. When the seal part is provided, it is pushed by the pressure inside the container and the projecting seal part is brought into close contact with the sealing plate, or the engaging part such as the stay is brought into close contact with the projecting seal part. It becomes possible.

  Further, like a pressure release valve according to claim 6 of the present invention, a mist trap or a gas-liquid separation membrane that prevents ejection of internal contents to the atmosphere side or the pressure vessel inside side of the valve body disposed in the valve mounting space When the ejection preventing layer made of the above or the like is provided, the ejection preventing layer acts as a shielding layer prior to the partition wall, so that it is possible to more effectively suppress the internal contents from being ejected when the valve is opened.

  Further, in the case where the valve body is provided with an engaging portion made of a stay or the like as in claim 4 above, since the outer diameter of the valve body is enlarged by the formation of the stay or the like, there is no stay or the like. Compared to the case, it is possible to attach an ejection prevention layer having a relatively large diameter. The large-diameter ejection preventing layer is easier to handle than the small-diameter layer.

  Furthermore, as in the pressure release valve according to claim 7 of the present invention, an attachment guide for attaching an ejection prevention layer made of a mist trap or a gas-liquid separation membrane is provided on the end surface portion of the valve body on the inner side of the pressure vessel. When attaching the ejection preventing layer to the valve body, the positioning operation can be facilitated. And if positioning work is facilitated in this way, attachment work such as adhesion will be facilitated.

  The present invention has the following effects.

  That is, in the pressure relief valve according to claim 1 of the present invention, a valve mounting space having a shape that opens to the inner side of the pressure vessel and closes the outer side of the pressure vessel is provided in the sealing plate, and the pressure is released into the valve mounting space. Since the valve body constituting the valve body of the open valve is arranged, a partition wall is arranged as a part of the sealing plate between the valve mounting space and the outside of the pressure vessel, and this partition wall acts as a shielding layer. . Therefore, it is possible to suppress the dust outside the container from entering the valve mounting space, thereby preventing the valve opening characteristics from being damaged or causing leakage due to the intrusion of external dust. can do. In addition, since the contents inside the container are prevented from being ejected when the valve is opened by the partition wall, it is possible to prevent the circuit from being corroded or short-circuited due to the ejection of the internal contents. it can.

  In addition to this, in the pressure release valve according to claim 2 of the present invention, the valve main body is engaged with the valve main body on the inner peripheral surface of the valve mounting space opened to the inner side of the pressure container, and the valve main body is inside the pressure container. Since the engagement part consisting of a step or the like that suppresses the movement to the side is provided, engaging the valve body with this engagement part increases the number of parts, complicates the assembly process, and further costs associated with them. The valve body can be prevented from falling off the sealing plate without incurring high.

  In the pressure release valve according to claim 3 of the present invention, the valve main body is engaged with the valve main body on the inner peripheral surface of the valve mounting space opened to the inner side of the pressure vessel, and the valve main body moves to the partition wall side. Since the engaging part consisting of a step to suppress is provided, by engaging the valve main body with this engaging part, the valve main body moves to the partition wall side and closes the communication hole or reduces the opening area of the communication hole. It is possible to prevent narrowing.

  Further, in the pressure relief valve according to claim 4 of the present invention, the engagement is formed on the outer peripheral portion of the valve body by a stay or the like that engages with the engagement surface of the sealing plate and prevents the valve body from moving to the partition wall side. Because the joint is provided, engaging the engagement part with the sealing plate prevents the valve body from moving toward the partition wall and closing the communication hole or reducing the opening area of the communication hole. can do.

  Further, in the pressure release valve according to claim 5 of the present invention, a protruding shape made of a bead or the like on one or both of the engaging portion made of a stay or the like and the engaging surface of the sealing plate engaged with the engaging portion. Since the seal portion is provided, the protruding seal portion is brought into close contact with the sealing plate by being pressed by the pressure inside the container, or the engaging portion such as a stay is brought into close contact with the protruding seal portion. Therefore, it is possible to prevent leakage of the internal pressure of the container or the stored contents such as the electrolytic solution from between the valve body and the sealing plate housing portion that supports the valve body.

  Further, in the pressure relief valve according to claim 6 of the present invention, a mist trap or a gas-liquid separation membrane for preventing ejection of internal contents on the atmosphere side of the valve main body arranged in the valve mounting space or on the inside of the pressure vessel Since the eruption prevention layer is provided, the eruption prevention layer acts as a shielding layer prior to the partition wall. Therefore, it is possible to more effectively suppress the stored matter such as the electrolytic solution inside the container from being ejected outside the container when the valve is opened.

  In addition, when the valve body is provided with an engaging portion made of a stay or the like and the ejection preventing layer is provided on the valve body, the outer diameter of the valve body is increased by the formation of the stay or the like. It is possible to attach an ejection prevention layer having a relatively large diameter as compared with the case where the above is not provided. The large-diameter ejection preventing layer is easier to handle than the small-diameter layer. Therefore, even if the sealing plate is downsized, it is possible to provide a pressure relief valve in which the handling property of the ejection preventing layer is good.

  Furthermore, in the pressure relief valve according to claim 7 of the present invention, an attachment guide for attaching an ejection prevention layer made of a mist trap or a gas-liquid separation membrane is provided on the end surface portion of the valve body on the inner side of the pressure vessel. In addition, when the ejection preventing layer is attached to the valve body, the positioning operation can be facilitated. Therefore, attachment work such as adhesion can be facilitated with the ease of this positioning work.

The present invention includes the following embodiments.
(1) In order to prevent mixing of dust and scattering of the internal electrolyte, a pressure relief valve is attached from the inside of the container of the sealing plate.
(2) In order to prevent the pressure release valve from falling off, the through hole is connected to the inner peripheral surface of the pressure release valve housing, and a step is provided on the inner peripheral surface.
(3) In order to prevent the through hole from being blocked, a step is provided on the lower side of the inner peripheral surface of the pressure release valve housing.
(4) A structure in which a mist trap is provided between the lip of the pressure release valve and the through hole, or a mist trap or a gas-liquid separation membrane is provided on the inside of the container of the pressure release valve in order to prevent the electrolyte from being ejected. To do.

(5) A pressure release valve used in a capacitor or a capacitor, etc., where the pressure release valve is attached from the inside of the case (bottom surface of the sealing plate).
(5-1) An axial movement prevention stay is provided on the pressure release valve.
(5-2) A sealing portion such as a bead is provided at the stay contact portion of the stay or the sealing plate.
(5-3) Set the size (diameter dimension) of the stay larger than the pressure release valve.
(5-4) A gas-liquid separation membrane, a mist trap or the like is arranged on the lower surface of the stay, and these positioning guides are further provided.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a sealed battery or capacitor (hereinafter simply referred to as a capacitor) 1 which is a pressure vessel having a pressure release valve (also referred to as a one-way valve) according to an embodiment of the present invention. ) Is a longitudinal sectional view thereof, and FIG. 5B is a plan view of FIG. FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG. 1B and shows a cross-sectional view of the pressure release valve 11.

  The capacitor 1 shown in FIG. 1 is configured as follows.

  That is, first, a bottomed cylindrical case 2 is provided as a pressure vessel made of a metal material such as aluminum. A main body element 3 is accommodated in the case 2, and an upper end opening of the case 2 is It is closed by a disc-shaped sealing plate 4 made of a material having electrical insulation. The main body element 3 is impregnated with an electrolyte solution enclosed in the case 2. The outer periphery of the case 2 is covered with an outer can 5.

  The sealing plate 4 has an outer peripheral portion continuously formed in the circumferential direction on the case 2 and a caulking portion 2a formed so that the upper end portion of the case 2 is folded back inward. Between the throttle part 2b, it is airtightly fixed via an annular gasket 6 made of a rubber-like elastic material. The sealing plate 4 is provided with a pair of electrode terminals 8 connected to the main body element 3 via lead wires 7 in the thickness direction and a pressure release valve 11. Each of the electrode terminals 8 is integrated in a state where a part thereof is embedded in the sealing plate 4 by insert molding, and is prevented from being detached from the sealing plate 4 by an annular flange 8a formed on the outer peripheral surface thereof. ing.

(1) Sealing plate The sealing plate 4 is formed into a plate shape from a polymer material, and is formed into, for example, a disk shape, an elliptical shape, or a substantially square shape. An electrode terminal made of aluminum or the like is formed on the sealing plate 4. 8 is embedded so as to penetrate in the thickness direction, and an external terminal (not shown) made of a metal plate such as SPCC, nickel, stainless steel or the like is attached to the outer end face of the electrode terminal 8.

  As the molding material of the sealing plate 4 made of a polymer material, a resin material, an elastomer (rubber, thermoplastic elastomer, a mixture of a resin material and rubber, or an elastic body such as a block copolymer or a graft copolymer), a resin material, An elastomer laminate material or the like is used.

  Resin materials include polyolefin resin, polyolefin resin polymerized by metallocene catalyst, polyphenylene sulfide, syndiotactic polystyrene, polyamide resin, polyester resin, polyimide resin, polyamideimide resin, liquid crystalline resin, etc. Examples include thermosetting resins such as plastic resins, phenolic resins, epoxy resins, and imide resins, and fibrous fillers such as glass fibers, carbon fibers, or whiskers, and particulate fillers such as carbon particles, mica, and glass beads. Fillers / reinforcing materials such as agents, metal oxides or processing aids are appropriately blended.

  Examples of elastomers include rubber materials such as butyl rubber, halogenated butyl rubber, vinyl-modified butyl rubber, ethylene propylene rubber, fluorine rubber, acrylic rubber, hydrogenated nitrile rubber and the like, cross-linking agents, fillers, A plasticizer or an antioxidant is appropriately blended. Examples of thermoplastic elastomers include olefin-based thermoplastic elastomers, ester-based thermoplastic elastomers, amide-based thermoplastic elastomers, hydrogenated styrene / butadiene block copolymers, and hydrogenated styrene / isoprene block copolymers. It is produced by a polymerization method, a graft copolymerization method, a dynamic crosslinking method, or the like, and a crosslinking agent, a plasticizer, an antiaging agent or a filler is appropriately blended. Examples of the elastomer such as a mixture of a resin material and rubber, a block copolymer, or a graft copolymer include a mixture of a phenol resin and a hydrogenated nitrile rubber, a phenol resin and an acrylic rubber, a butyl rubber, a fluorine rubber, or the like.

  The polymer material is appropriately selected according to required heat resistance. In this example, an example using a phenol resin which is one of thermosetting resins in terms of heat resistance and cost is shown.

  In this embodiment, the sealing plate 4 and the electrode terminal 8 are integrated by insert molding. However, the present invention is not limited to this, and the sealing plate 4 and the electrode terminal 8 are formed separately, and the sealing plate 4 is molded. A sealing plate of a type in which the electrode terminal 8 is integrated later may be used.

(2) Pressure release valve The pressure release valve 11 is in a closed state because the pressure in the capacitor 1 is equal to or lower than the set valve opening pressure in normal use, and the pressure in the capacitor 1 is a predetermined value. Is opened to release this pressure, and is configured as follows.

First embodiment ...
That is, as shown in FIG. 2, the sealing plate (housing) 4 is provided with a concave portion that has a flat circular shape that opens to the lower surface side, that is, the container inside A side and closes the upper surface side, that is, the container outside B side. The concave portion serves as a valve mounting space 12, and the valve main body 19 is press-fitted into the valve mounting space 12 from below (the container inside A side). Above the valve mounting space 12 (container outside B side), a partition wall 13 that partitions the valve mounting space 12 and the container outside B is provided as a part of the sealing plate 4. A shaft portion (shaft) 14 is provided downward in the center of the plane of the partition wall 13, and an outer peripheral surface 14 a of the shaft portion 14 corresponds to the valve body 19 that forms the valve body of the pressure release valve 11. It functions as a valve seat surface. In addition, a communication hole 15 for communicating the valve mounting space 12 and the container exterior B is provided in the outer peripheral edge portion of the partition wall 13, and a plurality of the communication holes 15 are provided in a uniform manner (for example, 3 equals). The communication hole 15 has an opening area that is sufficiently smaller than the flat area of the partition wall 13.

  The valve body 19 is constituted by a lip seal member (lip member) 20 in which an elastic body 22 made of a rubber-like elastic material is vulcanized and bonded to a reinforcing ring 21. The reinforcing ring 21 is integrally formed with an end wall portion (flange portion) 21b radially inward at one end (lower end in the figure) of the cylindrical portion 21a fitted to the inner peripheral surface 12a of the valve mounting space 12. Is. The elastic body 22 is attached to the outer peripheral surface of the tubular portion 21a of the reinforcing ring 21 and seals between the outer peripheral seal portion 22a and the inner peripheral surface 12a of the valve mounting space 12, and is integrally formed with the outer peripheral seal portion 22a. The radially inward lip 22b is integrally formed, and the radially inward lip 22b functions as a valve body in the pressure release valve 11. That is, the lip 22b is in contact (sitting) with the outer peripheral surface 14a of the shaft portion 14 with a predetermined interference, such as by fitting a garter spring (spring) 23, and the pressure inside the container A is below a predetermined value. When the pressure inside the container A exceeds a predetermined value, the lip 22b opens away from the outer peripheral surface 14a of the shaft portion 14. Therefore, it is possible to release the pressure exceeding the predetermined value to the outside B of the container. An annular gap c for connecting the container interior A and the communication hole 15 is set between the upper end surface 20 a of the lip seal member 20 and the inner bottom surface 12 b of the valve mounting space 12.

  Further, the inner peripheral surface 12 a of the valve mounting space 12 is provided with an engaging portion 16 having a step shape located at the upper portion thereof, and the elastic body 22 is provided with respect to the stepped engaging portion 16. As a result, the lip seal member 20 is prevented from moving downward, that is, toward the container interior A side and dropping off from the sealing plate 4.

  The valve mounting space 12 is formed by a mold, and in the sealing plate 4, the valve mounting space 12 is opened on the upper and lower surfaces of the figure, and the step-shaped engaging portion 16 is an undercut portion. Therefore, it is difficult to mold, but in this embodiment, the engaging portion 16 is molded as follows.

That is, the through hole 15 provided in the partition wall 13 is formed by placing a pin (not shown) in the molding die when the sealing plate 4 is molded by the molding die (not shown). As shown in FIG. 3, the planar arrangement of the communication holes 15 is arranged so that a part thereof protrudes to the outer peripheral side of the outer peripheral edge of the partition wall 13 or the inner peripheral surface 12 a of the valve mounting space 12. Also, its length as the pin is longer than the length L ₁ of the communicating hole 15, used as the upper end of the communication hole 15 of the position to which form a stepped engagement portion 16 of length L _2. Then, when this long pin is placed in the mold and the sealing plate 4 is molded, at the same time as the molding, the step-shaped engagement portion is formed at the position directly below the communication hole 15 on the inner peripheral surface 12a of the valve mounting space 12. 16 is formed. Therefore, the same number of stepped engagement portions 16 as the communication holes 15 are formed, and if the communication holes 15 are formed in three equal distributions, the engagement portions 16 are also formed in three equal distributions. After the pin is pulled out, the trace of the pin remains as a recess in the inner peripheral surface 12a of the valve mounting space 12, and the step-like engagement portion 16 is formed by the flat tip end surface of the pin.

  Further, the inner peripheral surface 12a of the valve mounting space 12 is provided with an engaging portion 17 having a step shape located at the lower portion thereof. Since the outer peripheral seal portion 22a is elastically engaged upward in the figure, the lip seal member 20 is prevented from moving upward, that is, toward the partition wall 13 and closing the communication hole 15. Unlike the upper engaging portion 16, the lower step-like engaging portion 17 is formed relatively easily because it does not form an undercut portion. The engaging portion 17 is formed in an annular shape.

  The pressure inside the container A pushes and opens the lip 22 b from the container inside A, and is released to the container outside B through the gap c and the communication hole 15.

  According to the pressure release valve 11 having the above-described configuration, the following operational effects can be achieved.

  That is, in the pressure release valve 11 having the above-described configuration, the partition wall 13 formed integrally with the sealing plate 4 acts as a kind of shielding layer that partitions between the valve mounting space 12 in which the valve body 19 is mounted and the container exterior B. Therefore, it is possible to suppress the dust outside the container B from entering the valve mounting space 12. Therefore, it is possible to prevent the valve opening characteristics of the valve main body 19 from being impaired or causing leakage due to dust intrusion and accumulation / adhesion. Although the communication hole 15 is provided in the partition wall 13, since the opening area of the communication hole 15 is formed small, the intruding dust is suppressed to a very small amount.

  At the same time, the partition wall 13 prevents the electrolyte solution inside the container A from being ejected when the valve is opened, which causes corrosion, short-circuiting, etc. in the electrical circuit around the pressure vessel due to the ejection of the electrolyte solution. Can be prevented. In this embodiment, in particular, the position of the lip 22b from which the electrolyte solution is ejected and the position of the communication hole 15 are displaced in the radial direction (the lip 22b is in the radially inward position. On the other hand, the communication hole 15 is arranged not in the position directly above it but in the radially outward direction), and the ejection prevention effect is set particularly large.

  Further, the inner peripheral surface 12a of the valve mounting space 12 is engaged with the outer peripheral seal portion 22a of the lip seal member 20 forming the valve main body 19 to prevent the lip seal member 20 from moving toward the container interior A side. Since the engaging portion 16 is provided, the lip seal member 20 can be moved from the sealing plate 4 to the container without incurring inconveniences such as an increase in the number of parts, a complicated assembly process, and a high cost associated therewith. It is possible to effectively prevent the dropout to the inside A.

  Further, a step-like engagement portion 17 that engages with the outer peripheral seal portion 22a of the lip seal member 20 and suppresses the lip seal member 20 from moving toward the partition wall 13 on the inner peripheral surface 12a of the valve mounting space 12 is provided. Therefore, it is possible to effectively prevent the lip seal member 20 from moving toward the partition wall 13 and closing the communication hole 15 or reducing the opening area of the communication hole 15.

  In addition, in the said 1st Example, although it was set as the structure which suppresses the ejection of electrolyte solution only by the partition wall 13, in addition to this partition wall 13, the following may be added.

Second embodiment ...
That is, as shown in FIG. 4, from the mist trap or the gas-liquid separation membrane, the pressure release flow path is blocked inside the valve mounting space 12 and outside the container B side (atmosphere side) of the valve body 19. An ejection preventing layer 24 is disposed. In other words, in this embodiment, the ejection preventing layer 24 is formed in an annular shape and disposed between the lip 22b and the outer peripheral seal portion 22a, and the ejection preventing layer 24 allows passage of mist generated from the inside A of the container. Shut off. Since the ejection preventing layer 24 is disposed as described above, if the eyes of the ejection preventing layer 24 are too fine, there is a pressure difference between the space 25 between the lip 22b and the ejection preventing layer 24 and the container outside B side. Since the internal pressure may not be released from the communication hole 15, it is preferable that the ejection prevention layer 24 has a coarser mesh. As the ejection preventing layer 24, for example, a nonwoven fabric is used.

Third embodiment ...
As shown in FIG. 5, the pressure prevention flow path is blocked inside the valve mounting space 12 and on the lower surface side of the valve body 19, that is, the container inside A side, to prevent ejection from a mist trap or a gas-liquid separation membrane. Layer 24 is disposed. In other words, in this embodiment, the ejection preventing layer 24 is formed in a disk shape and disposed on the lower surface side of the lip seal member 20, and the ejection preventing layer 24 allows passage of mist generated from the inside A of the container. Shut off. The ejection prevention layer 24 is attached by means such as adhesion. In addition, since this ejection preventing layer 24 is disposed as described above, the ejection preventing layer 24 is preferably a gas-liquid separation membrane having both gas permeability and liquid impermeability. It is possible to more effectively prevent the electrolyte from being ejected. As the ejection preventing layer 24, for example, a polymer material such as silicon rubber is used, but a non-woven fabric may be used as in the second embodiment.

Fourth embodiment ...
In the first embodiment, the outer peripheral surface of the outer peripheral seal portion 22a of the elastic body 22 that engages with the step-like engaging portions 16 and 17 provided on the inner peripheral surface 12a of the valve mounting space 12 is formed in a cylindrical shape. The outer peripheral seal portion 22a is configured to engage in the vertical direction with respect to the engaging portions 16 and 17 by elastic deformation, but in order to further increase the engagement force, You may provide the engaging part which exhibits the stepped shape etc. which engage with the engaging parts 16 and 17. FIG.

  In the example of FIG. 6 shown as the fourth embodiment, an engagement portion 22c having an annular shape is provided on the outer end surface of the outer peripheral seal portion 22a of the valve body 19 on the container inner A side end (lower end in the figure). Since the engagement portion 22c on the valve body 19 side is engaged with the stepped engagement portion 17 on the sealing plate 4 side, the valve body 19 is further effectively prevented from moving upward.

  Also, as shown in FIG. 6, by providing a tapered or rounded chamfered portion 14b at the tip of the shaft portion 14, the valve body 19 can be easily inserted, and the valve body 19 is damaged during the insertion operation. Can be prevented beforehand. Furthermore, since the resin fluidity of the tip end portion of the shaft portion 14 where the resin does not easily flow is improved in terms of injection molding, it is possible to prevent the occurrence of molding defects.

Fifth Example ...
In the fifth embodiment shown in FIG. 7, as in the fourth embodiment, an annular stay is provided at the container inner A-side end (lower end in the figure) on the outer peripheral surface of the outer peripheral seal portion 22a of the valve body 19. The engagement portion 22c is integrally formed, and the valve-like body 19 moves upward by the engagement of the stay-like engagement portion 22c with the step-like engagement portion 17 on the sealing plate 4 side. Is more effectively prevented. In addition, an annular bead-shaped or rib-shaped projecting seal portion 22d is integrally formed upward on the upper surface of the stay-like engaging portion 22c, and this projecting seal portion 22d is formed in the container interior A. The seal performance of the part is enhanced by being pressed against the engagement surface of the engagement part 17 on the sealing plate 4 side. Therefore, according to this embodiment, it is possible to effectively prevent the electrolyte from leaking from the outer peripheral side of the valve body 19.

Sixth Example ...
The bead-shaped or rib-shaped projecting seal portion 22d having an annular shape in the fifth embodiment may be provided downward on the engagement surface of the engagement portion 17 on the sealing plate 4 side as shown in FIG. good.

Seventh Example ...
In the seventh embodiment shown in FIG. 9, as in the fifth embodiment, a stay-like engagement portion 22c is provided on the outer peripheral portion of the valve body 19, and a bead-like shape is formed on the upper surface of the engagement portion 22c. A protruding seal portion 22d is provided. In addition, an annular mounting guide 22e for mounting the ejection prevention layer 24 such as a mist trap or a gas-liquid separation membrane is provided downward on the peripheral edge of the lower surface of the elastic body 22 of the valve body 19, Thus, when attaching the ejection preventing layer 24 to the valve body 19, the positioning operation is facilitated. Therefore, along with facilitating this positioning operation, it is possible to facilitate attachment work such as adhesion. The inner peripheral side of the mounting guide 22e is a housing recess 22f that houses the ejection preventing layer 24.

  Further, as illustrated, the outer diameter of the stay-like engagement portion 22c is set larger than the outer diameter of the valve body 19, and the inner diameter of the mounting guide 22e provided on the lower surface of the stay-like engagement portion 22c. Since the (diameter dimension of the accommodating recess 22f) is also set larger than the outer diameter dimension of the valve body 19, according to this embodiment, it is possible to attach a relatively large ejection preventing layer 24. The large ejection prevention layer 24 is easy to handle and has good workability when attached to the valve body 19. Therefore, even if the entire sealing plate 4 is downsized as described above, it is possible to provide the pressure release valve 11 including the ejection preventing layer 24 with good handling.

  Although not shown, the form of the pressure release valve 11 provided with the mounting guide 22e is not limited to this embodiment. For example, the mounting guide 22e may be provided in the pressure release valve 11 according to the sixth embodiment (FIG. 8).

  Since the other configurations of the second to seventh embodiments are the same as those of the first embodiment, description thereof will be omitted. In addition, the configuration of the pressure release valve 11 according to the first to seventh embodiments can be variously changed within the technical scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the capacitor | condenser which has a pressure relief valve which concerns on the Example of this invention, (A) is a longitudinal cross-sectional view of the capacitor | condenser, (B) is a top view of the capacitor | condenser BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the pressure relief valve which concerns on 1st Example of this invention, (A) is a top view of the same pressure relief valve, (B) is sectional drawing of the same pressure relief valve, A in FIG.1 (B) -A line enlarged sectional view and BB line sectional view in FIG. 2 (A) (A) is explanatory drawing which shows planar arrangement | positioning of a communicating hole, (B) is CC sectional expanded sectional view in FIG. 3 (A) It is a figure which shows the pressure relief valve which concerns on 2nd Example of this invention, (A) is a top view of the same pressure relief valve, (B) is sectional drawing of the same pressure relief valve, D in FIG. 4 (A) -D sectional view It is a figure which shows the pressure release valve which concerns on 3rd Example of this invention, (A) is a top view of the same pressure release valve, (B) is sectional drawing of the same pressure release valve, and is E in FIG. -E sectional view It is a figure which shows the pressure relief valve which concerns on 4th Example of this invention, (A) is a top view of the same pressure relief valve, (B) is sectional drawing of the same pressure relief valve, F in FIG. 6 (A) -F sectional view It is a figure which shows the pressure relief valve which concerns on 5th Example of this invention, (A) is a top view of the same pressure relief valve, (B) is sectional drawing of the same pressure relief valve, G in FIG. -G sectional view It is a figure which shows the pressure release valve which concerns on 6th Example of this invention, (A) is a top view of the same pressure release valve, (B) is sectional drawing of the same pressure release valve, and H in FIG. -H sectional view It is a figure which shows the pressure release valve which concerns on 7th Example of this invention, (A) is a top view of the same pressure release valve, (B) is sectional drawing of the same pressure release valve, and is I in FIG. 9 (A). -I sectional view Sectional view of a pressure relief valve according to the prior art

Explanation of symbols

1 Capacitor (pressure vessel)
2 Case 3 Body element 4 Sealing plate 5 Outer can 6 Gasket 7 Lead wire 8 Electrode terminal 11 Pressure release valve 12 Valve mounting space 12a Inner peripheral surface 12b Internal bottom surface 13 Partition wall 14 Shaft portion 14a Outer peripheral surface 14b Chamfered portion 15 Communication hole 16 , 17, 22c Engagement part 19 Valve body 20 Lip seal member 20a Upper end surface 21 Reinforcement ring 21a Cylindrical part 21b End wall part 22 Elastic body 22a Peripheral seal part 22b Lip 22d Protruding seal part 22e Mounting guide 22f Housing recess 23 Garter Spring 24 Blowout prevention layer 25 Space A Container inside B Container outside c Gap

Claims (7)

In a pressure release valve (11) that is provided on the sealing plate (4) of the pressure vessel (1) and opens when the pressure in the pressure vessel (1) exceeds a predetermined value to release the pressure.
The sealing plate (4) is provided with a valve mounting space (12) having an opening on the inner side of the pressure vessel (1) and closed on the outer side, and the pressure release valve is provided in the valve mounting space (12). A valve body (19) that forms the valve body of (11) is disposed, and a communication hole (15) is provided in the partition wall (13) that partitions the valve mounting space (12) from the outside of the pressure vessel (1). A pressure relief valve characterized by that. The pressure relief valve of claim 1,
The valve body (19) engages with the valve body (19) on the inner peripheral surface (12a) of the valve mounting space (12) that opens to the inside of the pressure container (1), and the valve body (19) is connected to the pressure container (1). A pressure relief valve comprising an engagement portion (16) made of a step or the like that suppresses movement toward the inside. The pressure relief valve according to claim 1 or 2,
The valve main body (19) is engaged with the inner peripheral surface (12a) of the valve mounting space (12) opened to the inner side of the pressure vessel (1) and the valve main body (19) is moved to the partition wall (13) side. A pressure relief valve provided with an engaging portion (17) composed of a step or the like for suppressing movement. The pressure relief valve according to claim 1 or 2,
Engagement part which consists of a stay etc. which engages with the engaging surface of a sealing board (4), and suppresses the said valve main body (19) moving to the partition wall (13) side in the outer peripheral part of a valve main body (19) (22c) The pressure release valve characterized by the above-mentioned. The pressure relief valve of claim 4,
A protruding seal portion (22d) made of a bead or the like on one or both of the engagement portion (22c) made of a stay or the like and the engagement surface of the sealing plate (4) engaged with the engagement portion (22c). A pressure relief valve characterized by comprising: The pressure relief valve according to any one of claims 1 to 5,
An ejection prevention layer (24) comprising a mist trap or a gas-liquid separation membrane for preventing ejection of the internal contents on the atmosphere side or the pressure vessel inside side of the valve body (19) disposed in the valve mounting space (12). A pressure relief valve characterized by comprising: The pressure relief valve of claim 6,
A pressure relief valve, characterized in that an attachment guide (22e) for attaching an ejection prevention layer (24) made of a mist trap or a gas-liquid separation membrane is provided on the inner end face of the pressure vessel in the valve body (19).

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