CN206271560U - Pressure valve and electrolytic capacitor - Google Patents

Abstract

The utility model provides a kind of pressure valve and electrolytic capacitor, and wherein pressure valve is configured to the outside that cardinal extremity is located at housing positioned at the inside and top of housing on the seal body that the housing to receiving capacitor element is sealed.Pressure valve has the sharp region of pointed shape.The stateful slit that can become closed mode and open mode because of elastic deformation is formed at the top in the sharp region.When housing internal pressure is less than certain value, slit remains off state.When housing internal pressure reaches certain value, the state change of slit makes the inside of the housing and ft connection into the open mode and discharges housing internal pressure.According to pressure valve of the present utility model and electrolytic capacitor, the rupture of pressure valve can be avoided and the extension of capacitor life-span is realized.

Description

Pressure valve and electrolytic capacitor

Technical field

The present invention relates to the pressure valve (pressure valve) of electrolytic capacitor and the electrolysis with the pressure valve electricity Container (electrolytic capacitor).

Background technology

As electrolytic capacitor and double layer capacitor, it is known to housing, seal casinghousing including receiving capacitor element Seal body and electrolytic capacitor (with reference to patent document 1) pressure valve of pressure valve of the closing through hole that is formed at seal body use The pressure valve 910 with flat part 911 shown in pressure valve 810 with flat part 811 or Figure 11 B shown in Figure 11 A.

If the internal pressure of housing reaches certain value, flat part 811,911 ruptures and discharges the gas in housing.

Prior art literature

Patent document

The Japanese Unexamined Patent Publication 2005-93941 publications of patent document 1

The content of the invention

The invention technical problem to be solved

The capacitor element being accommodated in housing is impregnated by electrolyte.When the internal pressure of housing reaches certain value, capacitor Element becomes high temperature, and electrolyte is rising in housing.In this case, once pressure valve 810 or 910 rupture, then electrolyte with From the pressure valve transpiration of rupture to the outside of housing, the static capacity of capacitor reduces and increase is lost gas.As a result, depositing In condenser loss failure and the problem in shortening capatcitor life-span.

It is an object of the invention to provide a kind of pressure valve and electrolytic capacitor, can by avoid the rupture of pressure valve come Realize the extension of capacitor life-span.

Technical scheme for solving technical problem

Pressure valve of the invention is configured to cardinal extremity position on the seal body that the housing to receiving capacitor element is sealed The outside of the housing, the sharp region with pointed shape, on the top in the sharp region are located in the inside and top of the housing Portion formed it is stateful can change the slit as closed mode and open mode because of elastic deformation, in the housing internal pressure not Maintain the closed mode of the slit during to certain value, and when the housing internal pressure reaches certain value the slit shape State is changing into the open mode, the inside of the housing is discharged in the housing with the ft connection of the housing Pressure.

According to said structure, due to the sharp region with pointed shape, it is possible to the slit effect as open mode The power (hereinafter referred to as " adaptability to changes ") of closed mode is returned to by elastic deformation.Therefore, certain value is reached in housing internal pressure When slit state change state to be opened and housing internal pressure can be discharged, and when housing internal pressure is less than certain value, slit by Can turn into closed mode in adaptability to changes and maintain the state.As a result, not allowing pressure valve to rupture and one can reached Housing internal pressure is discharged during definite value, the extension of capacitor life-span can be realized.And then, can play only allow from the inside of housing to Outside outflow and prevent the effect (hereinafter referred to as " non-return valve action ") of inflow from the outside of housing internally, it is possible to Prevent pollutant from invading (pollution) and arrive enclosure interior.

Furthermore it is preferred that sharp region is formed as round table-like or polygonal frustum described in said structure.According to above-mentioned shape, Above-mentioned adaptability to changes becomes big, it is possible to effectively obtaining non-return valve action.

It is preferred that the shape that the pointed shape is discussed further below：At the top in the sharp region, with described with link The length of the orthogonal first direction in the axial direction of top and the cardinal extremity is more than orthogonal with the axial direction and the first direction the The flat shape of the length in two directions, the slit is upwardly extended in the side intersected with the first direction.Thereby, it is possible to effective Prevent discharge housing internal pressure when, slit two ends near pressure valve split on the bearing of trend of slit and so that slit it is long Degree is elongated.Therefore, it is possible to suppress the elongated caused pressure-resistant reduction of slit length.

Now, the shape that the pointed shape can also be discussed further below：The thickness of the first direction is axial with described It is highly unrelated and be certain, and the thickness of the second direction is smaller closer to the top.Thereby, it is possible to effectively prevent narrow Seam length.

Additionally, now the slit can also extend in this second direction.Thereby, it is possible to effectively prevent slit long Degree is elongated.

Furthermore it is preferred that in said structure, the slit described in plan view is formed as linear.Slit is formed as straight Wire can increase adaptability to changes.Thus, it is possible to effectively obtain non-return valve action.

And then, preferably in said structure, the slit is formed as being taper on the thickness direction at the top.Pass through One of entrance and exit by slit forms narrower and is formed wider by another one, it can be ensured that the intensity of structure, Increase adaptability to changes and the function of check-valves can be effectively obtained.

Furthermore it is preferred that said structure includes at least a portion configuration in the valve master being formed in the through hole of the seal body Body；With the cardinal extremity for being connected to the valve body and with diameter greater than the bead body of the through hole, formed on the top of the valve body There is the sharp region.

In said structure, when pressure valve is configured at into seal body, valve body is configured at through hole, and the configuration of bead body is being surrounded The lower section of the wall of through hole.Therefore, the gas flow in housing increases, even if towards hull outside press pressure valve, also due to bead Body abuts with wall and can suppress pressure valve and depart from from seal body.

And, capacitor of the invention includes above-mentioned pressure valve, the seal body that is configured at the pressure valve, to be sealed body close The housing of envelope and the capacitor element for being accommodated in housing.

According to above-mentioned pressure valve, because the electrolyte that can suppress to impregnate capacitor element is discharged into outside housing too much Portion, it is possible to suppression capacitor lifetime.The slit periphery for being additionally, since pressure valve is used as check-valves, it is possible to suppression Pollution in housing processed.And then, there is no failure caused by pressure valve rupture, it is possible to realizing the extension of capacitor life-span.

Invention effect

In accordance with the invention it is possible to avoid the rupture of pressure valve.Extension thus, it is possible to realize capacitor life-span.

Brief description of the drawings

Figure 1A is the top view of the electrolytic capacitor of first embodiment of the invention.

Figure 1B is the IB-IB of the integrally-built Figure 1A along the electrolytic capacitor for representing first embodiment of the invention The partial section of line.

Fig. 2 is the exploded perspective view of the capacitor element shown in Figure 1A and Figure 1B.

Fig. 3 is the enlarged drawing on the pressure valve periphery from terms of front.

Fig. 4 A are the stereograms of pressure valve.

Fig. 4 B are the sectional views of the pressure valve along the IVb-IVb lines shown in Fig. 4 A.

Fig. 5 A are the top views for representing the pressure valve in terms of V directions state, from Fig. 4 A that slit is closed.

Fig. 5 B are the top views for representing the pressure valve in terms of V directions state, from Fig. 4 A that slit is opened.

Fig. 6 A be second embodiment of the present invention electrolytic capacitor in pressure valve slit for closed mode section Figure.

Fig. 6 B are to represent that the slit of the pressure valve shown in Fig. 6 A is the top view of open mode.

Fig. 7 be third embodiment of the present invention electrolytic capacitor in pressure valve sectional view.

Fig. 8 is the enlarged drawing in terms of the front on pressure valve periphery from the electrolytic capacitor of the 4th implementation method of the invention.

Fig. 9 A be the 4th implementation method of the invention electrolytic capacitor in pressure valve stereogram.

Fig. 9 B are the sectional views of the pressure valve along the IXb-IXb lines shown in Fig. 9 A.

Figure 10 be the variation of the 4th implementation method of the invention electrolytic capacitor in pressure valve sectional view.

Figure 11 A are the sectional views of existing pressure valve.

Figure 11 B are the sectional views of existing another pressure valve.

Specific embodiment

Hereinafter, with reference to the accompanying drawings of preferred forms of the invention.Herein, referring to the drawings as described below of the invention the The electrolytic capacitor of one implementation method.

[first embodiment]

As shown in FIG. 1A and 1B, electrolytic capacitor 1 includes capacitor element 2, housing 3a, seal body 3b, base plate 4, set Cylinder 5, fixture 6, terminal 7a, 7b and pressure valve 10.

Housing 3a is used to receive capacitor element 2, and opening portion is chimeric with seal body 3b.Seal body 3b seal casinghousings 3a.Shell Body 3a is made up of metal (aluminium etc.), and seal body 3b is made up of insulating materials (modified phenolic resin etc.).On the top of seal body 3b Periphery is configured with the pad 3x being made up of elastomeric material (rubber etc.).Pad 3x possesses prevents gas in housing 3a from seal body The function of the clearance leakage between 3b and housing 3a.The upper end of housing 3a is fixedly secured on pad 3x.

Base plate 4 is the circular film being made up of insulating materials (fire-retardant polyester etc.), with the bottom following table with housing 3a The mode that face overlaps is configured.Sleeve 5 is the substantially cylindric part being made up of insulating materials (polyolefin etc.), covering shell 3a Lateral peripheral surfaces and base plate 4 lower rim and the top periphery of housing 3a.Between the bottom of sleeve 5 and the bottom of housing 3a Clamp base plate 4 and be fixed.

Fixture 6 is used to be fixed on capacitor element 2 in housing 3a, is made up of thermoplastic resin (polypropylene etc.).

Terminal 7a, 7b and pressure valve 10 are configured at seal body 3b.Terminal 7a, 7b are closed in terms of the thickness direction from seal body 3b Configuration is spaced apart in the position of the central point of seal body 3b.Terminal 7a, 7b are made up of metal (aluminium etc.), cathode terminal 7a It is connected with the cathode leg 2a of capacitor element 2, anode terminal 7b is connected (reference picture with the anode tap 2b of capacitor element 2 2)。

As shown in Figure 1B, center when seal body 3b is in terms of the thickness direction from seal body 3b is (between terminal 7a- terminals 7b Center) through hole 30 of the inside with outside that connect housing 3a is formed between outer rim.Pressure valve 10 is configured to close the through hole 30, seal body 3b is fixed on by the lock washer (not shown) for being disposed on surface.Pressure valve 10 possesses release housing 3a The function of interior gas.Pressure valve 10 is for example by dienes such as the non-polydiene such as IIR, EPDM, silicon rubber, fluorubber or CR Rubber etc. is formed.

Then, reference picture 2 describes the structure of capacitor element 2 in detail.

Capacitor element 2 is formed as follows：It is respectively provided with across barrier film (brown paper etc.) 2z windings being made up of insulating materials The Cathode Foil 2y and anode foils 2x of cathode leg 2a and anode tap 2b, the coiling body being consequently formed is fixed with element loose-resitant belt 2t Periphery (reference picture 1B), coiling body is immersed in driving electrolytic solution afterwards.Anode foils 2x and Cathode Foil 2y are by aluminium foil Rough surface, anode foils 2x is also formed with anodic oxide coating on a surface.

Then, reference picture 3 and Fig. 4 describe the structure of pressure valve in detail.

As shown in figure 3, pressure valve 10 is matched somebody with somebody in the way of the inside that top is located at housing 3a positioned at the outside of housing 3a, cardinal extremity It is placed in seal body.

Pressure valve 10 has the valve body 11 for extending in the vertical direction and the bead being connected on the cardinal extremity of valve body 11 Body 12.Herein, above-below direction is direction (axial direction) of the top with cardinal extremity for linking pressure valve 10, is also the axial direction of through hole 30.Valve 3/5 or so the level configurations from cardinal extremity of main body 11 are in through hole 30.Bead body 12 has bigger than the diameter of through hole 30 straight Footpath, configuration is in the lower section of the wall portion 3b1 of the encirclement through hole 30 of seal body 3b.

As shown in Figure 4 A, valve body 11 have from cardinal extremity extend to top tubular cylinder region 21 and be formed in a region The sharp region 22 of 21 tops.Sharp region 22 is formed in the top of valve body 11.

Cylinder region 21 is the certain region of diameter.Sharp region 22 is formed as near the top of valve body 11, in Fig. 4 A In fore-and-aft direction (equivalent to " second direction " of the invention, be the direction orthogonal with the bearing of trend of slit described later 23) on Come to a point (i.e. the more past top of thickness of fore-and-aft direction is gone smaller).Wherein, in left and right directions (equivalent to " first party of the invention To ", be the bearing of trend of above-mentioned slit 23) on the width in sharp region 22 certain (i.e. the thickness of left and right directions is in above-below direction Optional position is all identical).

Topmost position in sharp region 22 is formed with the top 22t of elongated shape.Top 22t has the length of left and right directions Degree is longer than the substantially rectangular flat shape of the length of fore-and-aft direction.It is formed with the 22t of top in the lateral direction as length is straight The slit 23 of wire.As shown in Figure 4 B, slit 23 is formed as the thickness direction (upper and lower of the width in top 22t of left and right directions To) on certain (i.e. the width of left and right directions is all identical in the optional position of above-below direction).Because elasticity becomes around slit 23 Shape and enable to slit 23 turn into closed mode and open mode.Slit 23 opens the then inner space of pressure valve 10 and outside Connection.

As shown in Figure 4 B, pressure valve 10 is the hollow part of lower ending opening.

Then, reference picture 5A and Fig. 5 B illustrates the on-off action of slit 23.

If the internal pressure of housing 3a remains off state less than certain value, as shown in Figure 5A slit 23 in Figure 1B.

If the internal pressure of housing 3a reaches certain value, slit 23 is opened as shown in Figure 5 B, inside and the outside of housing 3a Connection, the internal pressure of housing 3a is released.Thus, the gas in housing 3a is released.Herein, the internal pressure of housing 3a reaches Situation during certain value, equivalent to situation when flat part 811 ruptures when using the existing pressure valve 810 shown in Figure 11 A.And And equivalent to situation when flat part 911 ruptures when using the existing pressure valve 910 shown in Figure 11 B.The internal pressure of housing 3a reaches It is, for example, situations below to certain value.That is, when forming anodic oxide coating in Cathode Foil because of backward voltage, because of overvoltage and Overcurrent etc. and damage the anodic oxide coating of anode foils, when producing hydrogen in the epithelium damaged by electrolyte reparation.In shape Into or repair above-mentioned epithelium when, capacitor element generate heat and cause the temperature in housing to rise, electrolyte transpiration.

The opening that the opening of slit 23 ruptures and formed significantly less than the pressure valve shown in existing Figure 11 A and Figure 11 B.Cause This, when slit 23 is open, even if the electrolyte in housing 3a is rising, the electrolyte in housing 3a is also hardly released from slit 23 Release.

Afterwards, when the internal pressure of housing 3a is less than certain value, slit 23 is closed.Because, before and after pressure valve 10 is formed as Smaller pointed shape is removed in the more past top of thickness in direction, thus to clip slit 23 and forefoot area relative in the longitudinal direction 31 and rear region 32 on turn into open state slit 23 act on adaptability to changes (reference picture 4A).

When the internal pressure of the gas from the state in housing 3a reaches certain value again, slit 23 is opened, the gas in housing 3a Body is released.Afterwards, when the internal pressure in housing 3a is less than certain value, slit 23 is closed.Such opening of slit 23 repeatedly With closing.

As described above, in the electrolytic capacitor 1 of the pressure valve 10 with present embodiment, being formed with pressure valve 10 Sharp region 22, the top 22t in sharp region 22 is formed with slit 23.Thereby, it is possible to the surrounding elastomeric deformation because of slit 23 The effect adaptability to changes of slit 23 as open mode.Therefore, only when the internal pressure of housing 3a has reached certain value slit 23 shape State is changing into open mode, can not only discharge the internal pressure of housing 3a, and can when the internal pressure of housing 3a is less than certain value By adaptability to changes so that slit 23 turns into closed mode and maintains the state.As a result, pressure valve 10 can not be allowed to rupture and Release has reached the internal pressure of the housing 3a of certain value, can realize the life-time dilatation of electrolytic capacitor 1.And, only allow housing The outflow of the gas of the interior of 3a etc., can play the effect (non-return for preventing the inflow internally of the outside of housing 3a Valve action), it is possible to preventing pollutant from invading the inside of (pollution) housing 3a.

Additionally, slit 23 is formed as linear in the plan view of pressure valve 10, so easily effect makes in front and back The close power (adaptability to changes) in the upward forefoot area 31 and rear region 32 for clipping slit 23 region to each other.Therefore, it is possible to effectively obtain Obtain non-return valve action.

And, when pressure valve 10 is configured at into seal body 3b, at least a portion of valve body 11 is configured in through hole 30, is dashed forward Edge body 12 is configured in the lower section of the wall portion 3b1 for surrounding through hole 30.Thus, even if the internal pressure of housing 3a reaches certain value, pressure valve 10 by the outside pressing towards housing 3a, also due to bead body 12 is abutted with wall portion 3b1, it is possible to suppressing pressure valve 10 from envelope Mouth body 3b departs from.

[second embodiment]

Second embodiment of the present invention is illustrated referring next to Fig. 6 A and Fig. 6 B.Second embodiment is different from first and implements The point of mode is the direction of pointed shape and slit.Wherein, identical symbol is used with above-mentioned first embodiment identical structure, It is appropriate that the description thereof will be omitted.

The pressure valve 110 of present embodiment is located at the side that the outside of housing 3a, cardinal extremity are located at the inside of housing 3a with top Formula is configured at seal body.

Pressure valve 110 as the pressure valve 10 of first embodiment, with the valve body 111 for extending in the vertical direction With the bead body 112 being connected on the cardinal extremity of valve body 111.Valve body 111 as the pressure valve 11 shown in Fig. 4 A, with from Cardinal extremity extends to the cylinder region of the tubular of top and is formed in the sharp region 102 of an overlying regions.

Sharp region 102 be formed as have near valve body 11 top and in fig. 6 fore-and-aft direction (with it is aftermentioned Slit 103 the parallel direction of bearing of trend) on come to a point the pointed shape of (i.e. the more past top of thickness of fore-and-aft direction is gone smaller). In addition, on left and right directions (direction orthogonal with the bearing of trend of slit 103) certain (the i.e. right and left of the width in sharp region 102 To thickness it is all identical in the optional position of above-below direction).

Topmost position in sharp region 102 is formed with the top 102t of elongated shape.Top 102t and the first embodiment party The top 22t of formula is the same, the substantially rectangular flat shape more long than the length of fore-and-aft direction of the length with left and right directions.This reality The top 102t for applying mode is formed as compared with the top 22t of first embodiment wider width in the longitudinal direction.

Linear slit 103 long in the longitudinal direction is formed with the 102t of top.Due to bullet around slit 103 Property deformation and enable to slit 103 turn into closed mode and open mode.The inside that slit 103 opens then pressure valve 110 is empty Between and ft connection.

Then the on-off action of slit 103 is illustrated.

If the internal pressure of housing 3a remains off state less than certain value, as shown in Figure 6A slit 103.

If the internal pressure of housing 3a reaches certain value, slit 103 is opened as shown in Figure 6B, inside and the outside of housing 3a Connection, the internal pressure of housing 3a is released.Thus, the gas in housing 3a is released.

Afterwards, when the internal pressure of housing 3a is less than certain value, slit 103 is closed.Gas from the state in housing 3a When internal pressure reaches certain value again, slit 103 is opened, and the gas in housing 3a is released.Afterwards, the internal pressure in housing 3a is small When certain value, slit 103 is closed.The so opening of slit 103 and closing repeatedly.

Wherein, in the first embodiment, the flat shape of the top 22t in sharp region 22 is elongated in the lateral direction, narrow Seam 23 extends in the lateral direction.Therefore, if the internal pressure in housing 3a steeply rises repeatedly, when slit 23 is opened, have May be split on the bearing of trend of slit 23 in pressure valve 10 near the two ends of slit 23 and cause that slit length is elongated.If Slit length is elongated, then pressure-resistant i.e. valve work pressure is easily reduced.In this regard, in the present embodiment, the top 102t in sharp region 102 Flat shape it is elongated in the lateral direction, slit 103 extends in the longitudinal direction.Therefore, it is possible to effectively prevent in slit During 103 opening, pressure valve 110 is split on the bearing of trend of slit 103 and causes slit near the two ends near slit 103 Length.Therefore, it is pressure-resistant to be also difficult to reduce even if the internal pressure in housing 3a steeply rises repeatedly.

In the present embodiment, the point in sharp region 102 is shaped as, and thickness and the above-below direction of left and right directions are axial height Degree is unrelated and be certain, and the thickness of fore-and-aft direction is smaller closer to above-mentioned top.Thus, in slit 103 when slit 103 is opened Two ends near, suppress the power split on the bearing of trend of slit 103 of pressure valve 110 and larger work, it is possible to having Prevent slit length elongated to effect.

And then, in the present embodiment, slit 103 is (left with fore-and-aft direction, the length direction i.e. with elongated top 102t Right direction) orthogonal side upwardly extends, so during the opening of slit 103 near the two ends of slit 103, suppressing pressure valve 110 and existing The power split on the bearing of trend of slit 103 larger works, it is possible to effectively preventing slit length elongated.

Wherein, if the pointed shape in sharp region 102 be formed as top 102t flat shape it is elongated in one direction, Can not be the shape in present embodiment.Also, it is preferred that direction of the bearing of trend of slit 103 and this is orthogonal, but only To intersect with a direction can also be non-orthogonal.

[the 3rd implementation method]

Third embodiment of the present invention is illustrated referring next to Fig. 7.3rd implementation method and first embodiment and second The difference of implementation method is the shape of slit.Wherein, accorded with using identical with above-mentioned first embodiment identical structure Number, it is appropriate that the description thereof will be omitted.

Slit 123 is formed as linear in the lateral direction on the top 22t in sharp region 22.The right and left of slit 123 To width be formed as more past top and remove taper wider.The width of the upper end of slit 123 is the slit 23 with first embodiment Width identical width.

According to said structure, the 3rd implementation method also as first embodiment, reaches necessarily in the internal pressure of housing 3a During value, slit 123 is opened, and the gas in housing 3a is discharged from slit 123.Even if slit 123 is opened, electrolyte is also almost Do not discharged from slit 123.And, do not allow pressure valve to rupture and the internal pressure of the housing 3a for having reached certain value can be discharged, It is possible to realizing electrolytic capacitor life-time dilatation.Suppress the lifetime of electrolytic capacitor 1.And, gas is less than certain Slit 123 is closed during value, as check-valves.

And, slit 123 is formed as the taper changed on the thickness direction of top 22t, it is ensured that structure is strong Spend and increase adaptability to changes.Thus, it is possible to effectively obtain non-return valve action.

[the 4th implementation method]

The 4th implementation method of the invention is illustrated referring next to Fig. 8 and Fig. 9.4th implementation method and first embodiment Difference is the shape of pressure valve.Wherein, identical symbol is used with above-mentioned first embodiment identical structure, it is appropriate to save Slightly its explanation.

As shown in figure 8, pressure valve 210 has the valve body 211 and and valve body of the through hole 230 for being configured at seal body 203b The bead body 212 of 211 cardinal extremity connection.Bead body 212 has the diameter bigger than the diameter of through hole 230, configures in seal body The lower section of the wall portion 203b1 of the encirclement through hole 230 of 203b.

As shown in Figure 9 A, valve body 211 has the top of substantially cylindric cylinder region 221 and configuration in cylinder region 221 Round table-like sharp region 222.Sharp region 222 is formed as the pointed shape diminished with the top end diameter near valve body 211.

Cylinder region 221 is formed with two major diameter portions 221a, 221b with diameter greater than other parts.Major diameter portion 221a, The diameter of 221b is slightly larger than the diameter of the through hole 230 shown in Fig. 8, so when valve body 211 is configured at into through hole 230, by big straight 221a, 221b are sealed between a region 221 and seal body 203b (reference picture 8) in footpath portion.

As shown in Figure 9 A, the top 222t in sharp region 222 is circle.Top 222t is formed with what is extended in the lateral direction Short linear slit 223.As shown in Figure 9 B, the thickness of top 222t is thicker.The width of the left and right directions of slit 223 is at top On the thickness direction (above-below direction) of 222t certain (i.e. the width of left and right directions is all identical in the optional position of above-below direction).

Pressure valve 210 is the hollow part of lower ending opening.Slit 223 open and cause pressure valve 210 inner space with Ft connection.

When the internal pressure of the housing 3a shown in Figure 1B is less than certain value, slit 223 is closed (reference picture 9A and Fig. 9 B).In shell When the internal pressure of body 3a reaches certain value, slit 223 is opened, and the gas in housing 3a is released.Gas in housing 3a During less than certain value, slit 223 is closed.So opening and closing of slit 223 repeatedly.As a result, not allowing pressure valve 210 to be broken Split and the internal pressure of the housing 3a for having reached certain value can be discharged, electrolytic capacitor life-time dilatation can be realized.

According to said structure, the 4th implementation method also as first embodiment, reaches necessarily in the internal pressure of housing 3a During value, slit 223 is opened, and the gas in housing 3a is discharged from slit 223.The slit when internal pressure of housing 3a is less than certain value 223 are closed, therefore electrolyte is hardly discharged from slit 223.Therefore, it is possible to suppress the lifetime of electrolytic capacitor.And And, when the internal pressure of housing 3a is less than certain value, slit 223 is closed, and can act as check-valves.

Sharp region 222 is additionally, since for round table-like, so in top 222t, region effect around slit 223 towards The power at the center of top 222t, the power is concentrated on slit 223, to close slit 223.Therefore, it is possible to effectively obtain non-return The function of valve.

It is additionally, since that slit 223 is shorter, so easily the region effect around slit 223 is towards in the 222t of top The power of the heart.And, the thickness of top 222t is thicker, so the adaptability to changes in the case of thickness of thin than top 222t is big.Thus, The function of check-valves can be effectively obtained.

【Embodiment】

The present invention is further illustrated below according to embodiment.

The pressure valve of the 3rd implementation method shown in Fig. 7 has been used in embodiment No.1 to No.3.In pressure valve, cylinder The height in region is 10mm and a diameter of 4mm, the height in sharp region are 5mm, and the left and right directions width of slit is in upper end 0.5mm, is 0.3mm in lower end.

In conventional example No.4 to No.6, the discoideus pressure valve (diameter 8mm) shown in Figure 11 A has been used.

The diameter for being formed at the cylindric through hole of seal body is 4mm.

In embodiment No.1 to No.3 and conventional example No.4 to No.6, using a diameter of 76.2mm, highly it is 90mm, rated voltage are 400V and static capacity is the electrolytic capacitor (ensureing the product of 5000 hours) of 4700 μ F.By the electricity Electrolysis condenser is positioned in the environment of 105 DEG C of environment temperature and applies rated voltage (400V) has carried out failtests.Put (initial) and placed 8000 hours each parameters afterwards and be shown in table 1 before putting experiment.

【Table 1】

" outward appearance " of table 1 is by by visually being judged.In embodiment No.1 to No.3,8000 hours pressures are have passed through Power valve does not also rupture, the problems such as being broken down in the absence of electrolytic capacitor.And, have passed through 8000 hours static capacity Cap, damages Consumption angle tangent tan δ and leakage current LC also change seldom.

This is considered because when the internal pressure of housing reaches certain value, although gas is discharged from slit, but electric Solution liquid is not almost released.And, have passed through 8000 hours pressure valve can also also be continuing with.

And in conventional example No.4 to No.6, when have passed through 8000 hours, static capacity Cap drops to one Half left and right, and losstangenttanδ rises nearly 10 times, pressure valve rupture, electrolytic capacitor failure.This is considered because Electrolyte is discharged from the foramen lacerum for being formed at pressure valve.

More than, embodiments of the present invention are illustrated with reference to the accompanying drawings, but concrete structure is not by these embodiment party Formula is limited.The scope of the present invention is not limited by described above and limited by the scope of Patent request, and comprising with Patent request Being had altered in the scope equivalent meaning and scope.

For example, the valve body 11 of first embodiment has cylinder region 21 but it is also possible to be the knot without cylinder region 21 Structure.Additionally, the valve body 211 that the valve body 111 of second embodiment also has cylinder region, the 3rd implementation method also has cylinder area Domain 21, the valve body 311 of the 4th implementation method also has cylinder region 321, but these valve bodies can also be without cylinder region Structure.

And, in the above-described 4th embodiment, sharp region 222 is round table-like, but sharp region 222 can also be many pyramids Mesa-shaped, such as pyrometric cone mesa-shaped, quadrangular pyramid mesa-shaped, pentagonal pyramid mesa-shaped.

Additionally, in above-mentioned first embodiment to the 4th implementation method, slit 23,103,123,223 is in left and right directions On be linear, but it is also possible to change the shape of slit.Such as slit can also be corrugated.

And, in the above-described 4th embodiment, the thickness direction of the width of the left and right directions of slit 223 in top 222t It is upper certain, but the width of the left and right directions of slit 223 can also be taper on the thickness direction of top 222t.Thus, by In the intensity of structure is able to ensure that, it is possible to effectively obtaining the function of check-valves.Equally, slit in this second embodiment The width of 103 left and right directions can also change on the thickness direction at top 102.

Additionally, in the above-described 4th embodiment, the thickness of the top 222t in sharp region 222 is thicker, but top 222t is not It is limited to such structure.It is for example as shown in Figure 10, it is also possible to form thinner wall section in the central portion of the top 322t in sharp region 322 401, and the heavy section 402 that thickness is thicker than thinner wall section 401 is formed around it, slit 323 is formed at thinner wall section 401.

Electrolytic capacitor is illustrated as embodiments of the present invention, but pressure valve of the invention can be used for electric double layer Capacitor.

Claims (9)

1. a kind of pressure valve, is configured to cardinal extremity positioned at described on the seal body that the housing to receiving capacitor element is sealed The inside and top of housing are located at the outside of the housing, and the pressure valve is characterised by：

Sharp region with pointed shape,

The stateful slit that can become closed mode and open mode because of elastic deformation is formed at the top in the sharp region,

When the housing internal pressure is less than certain value, the slit maintains the closed mode,

And the state change of the slit makes the housing into the open mode when the housing internal pressure reaches certain value Inside discharge the housing internal pressure with the ft connection of the housing.

2. pressure valve as claimed in claim 1, it is characterised in that：The sharp region is formed as round table-like or polygonal frustum.

3. pressure valve as claimed in claim 1, it is characterised in that：The shape that the pointed shape is discussed further below：In the point The top in region, the length with the first direction orthogonal with the axial direction for linking the top and the cardinal extremity is more than and institute The flat shape of the length of the orthogonal second direction of axial and described first direction is stated,

The slit is upwardly extended in the side intersected with the first direction.

4. pressure valve as claimed in claim 3, it is characterised in that：The shape that the pointed shape is discussed further below：Described first The thickness in direction with it is described axial highly unrelated and be certain, and the thickness of the second direction is got over closer to the top It is small.

5. the pressure valve as described in claim 3 or 4, it is characterised in that：The slit extends in this second direction.

6. pressure valve as claimed in claim 1 or 2, it is characterised in that：In plan view, the slit is formed as straight line Shape.

7. pressure valve as claimed in claim 1, it is characterised in that：The slit is formed as on the thickness direction at the top Taper.

8. pressure valve as claimed in claim 1, it is characterised in that：The seal body is being formed at including at least a portion configuration Through hole in valve body；And be connected with the cardinal extremity of the valve body and with diameter greater than the bead body of the through hole,

The sharp region is formed with the top of the valve body.

9. a kind of electrolytic capacitor, it is characterised in that including：Pressure valve any one of claim 1 to 8；

It is configured with the seal body of the pressure valve；

The housing sealed by the seal body；With

It is accommodated in the capacitor element of the housing.