WO2019031432A1 - Capacitor and method for manufacturing same - Google Patents

Abstract

The present invention comprises a capacitor element (30), a capacitor case (case 22) housing the capacitor element, and a sealing plate (2) sealing an opening (24) of the capacitor case. The sealing plate comprises: a laminate obtained by laminating a gas-permeable first member (rubber layer 4) and a gas-sealing second member (resin layer 6); a compressing part that compresses part of a planar section of at least the first member of the laminate; and a gas pressure-adjusting part that adjusts pressure by allowing gas permeation through a through-hole (12) formed in the second member of the laminate and the first member covering the through-hole at a position not overlapping a thin section (X) established at the compressing part and a prescribed range around the compressing part. As a result, sufficient sealing plate rigidity is obtained and gas pressure adjustment functionality can be maintained.

Description

Capacitor and method of manufacturing the same

The present invention relates to a sealing technique for sealing a capacitor case and adjusting the pressure in the case.

In a capacitor such as an electrolytic capacitor, the internal pressure gradually rises as hydrogen gas or the like is generated by the reaction between the capacitor element and the electrolytic solution. The condenser is provided with a pressure valve that opens a predetermined position of the condenser case in order to reduce the influence on the surroundings when the internal pressure exceeds the limit of the condenser case. When this pressure valve operates, it is the life of the condenser.
The capacitance C (unit: [F]) of the capacitor is S [m ² ] the effective area of the surface of the anode foil facing the cathode foil, and d the thickness of the oxide film layer formed on the surface of the anode foil [M], assuming that the relative permittivity of the oxide film is ε,
8.854 × 10-12 × ε · S / d (1)
It becomes. Capacitors are required to have a high capacity while maintaining or miniaturizing the volume of mounted products. In order to increase the capacity of the capacitor while maintaining the size, a method of thinning the oxide film layer formed on the surface of the electrode foil, that is, reducing the thickness d of the formula (1) is taken. By the way, the withstand voltage of the capacitor depends on the thickness of the oxide film layer. The thinner the oxide film layer of the electrode foil, the lower the withstand voltage of the anode foil, and the increase in so-called leakage current (LC) by application of a DC (Direct Current) voltage. When the leakage current increases on the anode foil side and the movement of charges on the electrode surface becomes intense, the reaction amount on the cathode foil side increases according to the Faraday law, and the amount of hydrogen gas generated on the cathode foil side It leads to an increase in the internal pressure of the case.

There is an electrolytic capacitor in which a gas permeable portion for discharging only the gas accumulated in the capacitor case to the outside is formed on a sealing plate in relation to the increase of the case internal pressure due to the gas generation (for example, Patent Document 1).

JP-A-8-335536

By the way, the sealing plate is formed of, for example, a laminate in which a plurality of members having different properties are laminated. The sealing plate transmits the gas generated along with the sealing of the electrolytic solution, thereby maintaining the function of the capacitor and extending the usable period of the capacitor having a high capacity.
However, if the rigidity of the member for sealing the liquid among members constituting the laminate is insufficient, the gas pressure regulation portion can not oppose the internal pressure of the generated gas, and abnormal deformation of the member or lamination around the gas pressure regulation portion There is a risk that peeling of parts may occur. When such peeling of the laminate occurs, the electrolytic solution intrudes into the peeled portion, reaches the interface between the external terminal and the sealing plate, and there is a possibility that the liquid may leak from the interface to the outside of the capacitor.
When the electrolyte leaks in this way, there is a problem that the electrolyte may adhere to the substrate, the electronic component, etc. around the capacitor and damage them.
Such a problem is not disclosed in Patent Document 1 and can not be solved.

Therefore, an object of the present invention is to maintain the gas pressure regulation function by providing sufficient rigidity to the sealing plate of the capacitor.

In order to achieve the above object, one side surface of the capacitor of the present invention comprises a capacitor element, a capacitor case for housing the capacitor element, and a sealing plate for sealing the opening of the capacitor case, the sealing plate being A stacked body in which a first member that transmits gas and a second member that seals a gas are stacked, and a pressing portion on which at least a part of a flat portion of the first member of the stacked body is pressed A through-hole formed in the second member of the laminate and the first through-hole covering the through-hole at a position not overlapping the thin portion set in a predetermined range around the pressing portion and the pressing portion. And a gas pressure regulation unit that regulates pressure by transmitting gas with a member.

In the above-described capacitor, the pressing portion may include a terminal component installed in the laminate, and the through hole may be formed at a distance of 2.0 mm or more from the installation position of the terminal component.
In the above capacitor, the pressing portion is a contact portion between the end portion side of the capacitor case folded back along the opening portion side and the first member, and the through hole is formed from the contact position of the end portion It may be formed in a range separated by 2.0 mm or more in the center direction of the laminate.

The above-mentioned capacitor may further include a liquid blocking portion which is disposed at the opening of the through hole to transmit gas to the through hole and to prevent the liquid from entering.
In the above capacitor, the first member may be a rubber material having a hardness of 50 Hs or more and 85 Hs or less according to the standard of JIS K6253.

In order to achieve the above object, according to one aspect of the capacitor manufacturing method of the present invention, a process of housing a capacitor element in a capacitor case, a first member that transmits gas, and a second member that seals gas are stacked. The laminated body at a position not overlapping the pressing portion by which at least a part of the flat portion of the first member of the laminated body is pressed and the thin portion set in the predetermined range around the pressing portion and the pressing portion A process of sealing the capacitor case with a sealing plate including a through hole formed in the second member and a gas pressure adjusting portion for adjusting a pressure by transmitting gas by the first member covering the through hole And a process of folding back the end of the capacitor case to the sealing plate so as to contact the first member at a position separated from the through hole by a predetermined distance or more.

The method for manufacturing a capacitor according to the present invention may further include a process of providing a liquid blocking portion which transmits gas to the through hole and prevents entry of liquid at least in the opening of the through hole.

According to the present invention, any of the following effects can be obtained.

(1) By preventing the function deterioration of the gas pressure regulator, it is possible to suppress the pressure rise in the capacitor case and extend the life of the capacitor.

(2) By forming the gas pressure regulating portion by avoiding the range in which the rigidity of the laminate is low, it is possible to prevent peeling of the laminate, entry of the electrolyte into the interior of the laminate, or outflow of the electrolyte to the outside of the laminate .

(3) By forming the through holes so as to avoid the periphery of the pressing portion generated by the contact with the laminate, it is possible to prevent the gas pressure regulating portion from being formed in the thin portion with low rigidity.

And, other objects, features and advantages of the present invention will become more apparent by referring to the attached drawings and the respective embodiments.

It is a figure which shows the example of an external appearance structure of the sealing board which concerns on 1st Embodiment. It is a figure which shows the partial cross section of a sealing board. It is a figure which shows the partial cross section containing the edge part of a sealing board. FIG. 2 is a view showing an example of an appearance configuration of an opening side of a capacitor in accordance with a first embodiment; It is sectional drawing which shows the example of an internal structure of a capacitor | condenser. It is a figure which shows the structural example of the sealing board which concerns on 2nd Embodiment. A is a sectional view showing an example of composition of a sealing board concerning Example 2, and B is a elements on larger scale showing composition of an opening. A is a sectional view showing an example of composition of a sealing board concerning Example 3, and B is the elements on larger scale showing composition of an opening. It is a figure which shows the result of Experimental example 1. FIG. It is a figure which shows the result of Experimental example 2. FIG. It is a figure which shows the measurement result of Experimental example 3. FIG. It is a graph which shows the expansion degree of the capacitor | condenser case of Experimental example 3. FIG.

First Embodiment
<Configuration of sealing plate 2>
FIG. 1 shows an example of the appearance configuration of the sealing plate according to the first embodiment. The configuration shown in FIG. 1 is an example, and the present invention is not limited to such a configuration.

The sealing plate 2 shown to A of FIG. 1 is an example of a means to seal the opening part of the case which accommodates a capacitor element etc., for example, is a laminated body which laminated | stacked the several member from which a function differs. The sealing plate 2 is formed in a shape corresponding to the opening shape of the case to be installed, and for example, when installed in a circular opening, it is formed in a disk shape having the same diameter as the opening or a diameter close thereto. Ru. In addition, when the opening of the case is a polygon, it is formed according to the shape and size.
Sealing plate 2 includes, for example, a rubber layer 4 and a resin layer 6 having the same shape in the plane portion of the laminate.

The rubber layer 4 is an example of the first member of the present disclosure, and has a function of transmitting a gas in a case in which the sealing plate 2 is installed, but blocking a liquid. The rubber layer 4 is made of, for example, a rubber material such as ethylene propylene rubber, butyl rubber, or silicone rubber. These rubber materials exhibit predetermined flexibility and elasticity, and, for example, as hardness according to JIS (Japanese Industrial Standards: Japanese Industrial Standard) K 6253 (test method for hardness of vulcanized rubber and thermoplastic rubber), Preferably, a material in the range of 50 [Hs] to 85 [Hs] is employed. The hardness of this rubber layer 4 is an example, and a value lower or higher than the range of this value may be used. The hardness value may be set to a value equivalent to this range with respect to standards other than JIS adopted in, for example, the manufacture or use area of sealing plate 2 or a capacitor using this sealing plate 2 .
Furthermore, the hardness of the rubber layer 4 is, for example, the range of values to be adopted according to the difference in the surrounding environment or usage area where the capacitor is installed, the test method of hardness measurement, or the standard set in the usage / production area. It may be different.
The rubber layer 4 is set in the range of 0.7 to 1.5 mm. If the thickness is smaller than 0.7 mm, the gas pressure regulating portion may be easily expanded by the internal pressure of the generated gas, and the laminated portion with the resin layer 6 around the gas pressure regulating portion may be easily peeled off. If it is thicker than 1.5 [mm], the sealing plate 2 becomes thick, which leads to the enlargement of the capacitor 20.

The resin layer 6 is an example of the second member of the present disclosure, and for example, a paper phenol resin is used. The paper phenol resin is a base material of the resin layer 6 and is a synthetic material in which a paper base material is impregnated with a phenol resin. The resin layer 6 functions as a support for the sealing plate 2 that maintains the shape of the laminated rubber layer 4 and blocks gas and liquid in the case in which the sealing plate 2 is installed. The resin layer 6 may have a single configuration of paper phenol resin, or may have a stacked configuration in which other materials (not shown) are stacked.

Furthermore, the sealing plate 2 is provided with a plurality of external terminals 8 on the center side of the flat plate portion, and functions as an anode terminal 8a and a cathode terminal 8b of the capacitor. External terminal 8 is formed, for example, in an “L” shape (not shown), and is disposed in parallel with a portion projecting from sealing plate 2 and a flat portion of sealing plate 2 in order to contact the substrate of an external device. And fixed to the flat portion of the sealing plate 2 by rivets 10. The rivet 10 is metallized on the conductive metal material or the surface and is electrically connected to the external terminal 8. The external terminal 8 and the rivet 10 are pressing members for pressing the sealing plate 2 flat plate portion, and a portion where the rubber layer 4 is crushed by this pressing or a portion which may be crushed is a pressing portion of the present disclosure. It is an example. For example, as shown in B of FIG. 1, the rivet 10 penetrates the shaft of the rivet 10 to the flat plate surface of the sealing plate 2 through a part of the external terminal 8 and has a diameter larger than that of the shaft The pressing portion is crimped to the flat surface of the sealing plate 2.
Then, on the flat plate surface of the sealing plate 2, a thin portion X by pressure bonding of the rivet 10 is formed in a predetermined range of a portion overlapping the pressing portion of the external terminal 8 or the rivet 10 and its periphery. The thin portion X has, for example, a shape similar to the shape of the external terminal 8 in contact with the flat portion. For example, if the contact shape of the external terminal 8 with the rubber layer 4 is circular, the shape of the thin-walled portion X will be circular or close accordingly. The formation range of the thin-walled portion X differs depending on, for example, the hardness of the rubber material forming the rubber layer 4, the pressing force of the rivet 10, the depth of pressing, and the like.

Besides, in the sealing plate 2, the through holes 12 are formed on the flat portion on the resin layer 6 side. One end of the through hole 12 is open to the outside, so that gas and liquid can flow into the resin layer 6. The other end side is covered by the laminated rubber layer 4. The through hole 12 and a part of the rubber layer 4 covering the opening end are an example of the gas pressure regulating portion of the present disclosure, and only the gas of the gas or liquid entering the through hole 12 permeates the rubber layer 4. Thus, the sealing plate 2 is transmitted. Further, the sealing plate 2 adjusts the gas pressure inside the case sealed by the sealing plate 2 by the rubber layer 4 blocking the liquid.
The through hole 12 is formed at a position not overlapping the thin portion X of the rubber layer 4 generated by the external terminal 8 or the rivet 10, for example. Besides, when the thin portion X is formed in the rubber layer 4 by the pressing member other than the external terminal 8 and the rivet 10 in the sealing plate 2, the through hole 12 is formed at a position not overlapping with the thin portion X.

<Position of gas pressure regulator from external terminal>
FIG. 2 shows a partial cross section of the sealing plate.
In the sealing plate 2, for example, as shown in FIG. 2, the thin-walled portion X of the rubber layer 4 spreads around the penetrating portions of the external terminals 8 and the rivets 10. In the thin portion X, for example, the thickness dx of the portion where the external terminal 8 and the rivet 10 come in contact is the smallest, and becomes the thickness d1 which is not pressed in accordance with separation from the contact portion. The thickness dx of the thin-walled portion X includes, for example, a proportional change according to the distance of separation, or a change of thickness depending on the distance from the pressing portion.
The through hole 12 functioning as a gas pressure regulating portion is formed outside the range of the thin portion X. The through hole 12 is formed within a range separated from 1.5 [mm], more preferably within a range separated by 2.0 [mm] or more as the predetermined distance L1 from the end of the external terminal 8 or the rivet 10 Ru. That is, the thin-walled portion X is affected by the material and hardness of the rubber layer 4, the size of the thickness d1, the pressing force of the rivet 10, and the like or any combination of two or more of them. Therefore, in the sealing plate 2, for example, the formation range of the thin portion X with respect to the condition of the rubber layer 4 set in advance is obtained, and the gas pressure regulation portion is formed in the range separated from the formation range of the thin portion X.

In the process of forming the through holes 12, for example, instead of determining the predetermined distance L1 to be separated from only one external terminal 8 or rivet 10 in the flat portion of the sealing plate 2, all or a predetermined number of external terminals in the flat portion It is determined whether or not a predetermined distance L1 from the rivet 8 or the rivet 10 is being separated. Thereby, the range in which, for example, the anode terminal 8a and the cathode terminal 8b face each other in the flat plate surface of the sealing plate 2 may fall within the range of the thin portion X by either or both of these external terminals. In some cases, the holes 12 can not be formed.
The opening diameter L2 of the through hole 12 may be set based on the type of gas desired to be transmitted as the gas pressure regulation portion and the amount of gas generated in the capacitor case to be sealed, for example, if it is set to 1.0 mm. Good.

<Position of gas pressure regulator from end of sealing plate>
FIG. 3 shows a partial cross section including the end of the sealing plate.
In the sealing plate 2, for example, in the plane of the laminate, the through holes 12 serving as the gas pressure adjusting portion are formed in the resin layer 6 within a range separated by a predetermined distance L3 from the outer peripheral end toward the center direction of the plane portion. . The predetermined distance L3 includes, for example, a distance L4 at which the end portion 14 of the case is folded back by caulking on the capacitor case, and a pressing distance L4 to the sealing plate, and a predetermined distance L5 from the case end. The distance L4 by which the case end 14 is folded back is, for example, 1.5 to 4.0 mm, and the distance L5 from the case end is, for example, a value larger than 1.5 mm, and more preferably Is set to a value of 2.0 [mm] or more.
The case end portion 14 is folded back, for example, to stabilize the contact state between the capacitor case and the sealing plate 2 and to prevent foreign matter from being mixed in with the bonding portion between the peripheral surface of the sealing plate 2 and the case. Crush the rubber layer 4 with the That is, a thin portion X of the sealing plate 2 is formed in the rubber layer 4 in a predetermined range of the pressing portion and the periphery thereof by the pressing portion being formed by the case tip portion 14. That is, the tip end portion 14 of the case is an example of the pressing member.

In the determination of the formation position of the through hole 12, for example, whether it is the thin portion X may be measured and managed, or the pressing force of the rivet 10, the material forming the rubber layer 4 or the information of its hardness It is also possible to use information measured in advance in a laboratory or the like.

<Manufacturing process of sealing plate 2>

Here, an example of the manufacturing process of the sealing board 2 is demonstrated.

(A) Process of producing laminated material In this process, for example, a paper phenol resin material is produced. The material produced here is, for example, in a semi-cured state called Prepreg. In the production of a paper phenolic resin material, for example, a paper substrate is impregnated with a solution of a phenolic resin before crosslinking dissolved in alcohol or the like, and is produced in a semi-cured state by heating or drying. Then, the flat portions of the paper phenol resin material and the rubber material of the formed prepreg are superimposed to make a laminated material. And this lamination material is thermocompression-bonded and integrated. Thereby, a laminated material including the rubber layer 4 and the resin layer 6 is generated.
(B) Forming process of sealing plate In this process, a process of forming the sealing plate 2 into a predetermined shape is performed. The produced laminated material is punched into the shape and dimensions of the sealing plate 2 by, for example, pressing. At this time, the laminated material is cut by, for example, a shearing blade of a press.
(C) Formation process of gas pressure regulation portion The laminated material formed by press working is, for example, the installation position of the external terminal 8 and the rivet 10 and / or the distance preset in the central direction from the outer periphery of the laminated body A plurality of through holes 12 are formed in the range taken. For example, the through hole 12 is cut from the surface of the resin layer 6 exposed by using a tool such as a dedicated drill, and the thickness to the portion where the rubber layer 4 is laminated is cut.
(D) Other Treatments In the sealing plate 2, for example, the external terminal 8 is penetrated to the central side of the laminate through a part of the rivet 10. The pressing force of the rivet 10 may be, for example, a value set in advance, and may be set according to, for example, the thickness of the laminate or the rubber layer 4 or the hardness of the rubber layer 4 or the like. In the installation of the external terminal 8 using the rivet 10, for example, in order to bring the external terminal 8 into close contact with the sealing plate 2, the pressing force is set so that the rubber layer 4 has a predetermined thickness dx. 8 should be installed.

[Effect of the First Embodiment]

According to such a configuration, the following effects can be obtained.

(1) Since the gas pressure regulation portion including the through hole is not formed in the range overlapping the thin portion X formed in the sealing plate, the rigidity of the rubber layer can be maintained, and the rubber layer is Abnormal expansion can be prevented.
(2) In order to prevent the decrease in the rigidity of the rubber layer due to the thin portion X, the gas pressure control function of transmitting the gas from the rubber layer can be maintained, and the life of the capacitor can be extended.
(3) By not providing the gas pressure regulating portion in the range of the thin portion X, it is possible to prevent peeling and breakage of a part of the laminate formed of the rubber layer and the resin layer.
(4) In addition, the rubber layer maintaining rigidity does not cause peeling or damage to a part of the laminate, and the electrolytic solution of the capacitor does not intrude or remain in the peeled portion. It is possible to prevent the functional deterioration of
(5) The electrolytic solution can be prevented from leaking from the gas pressure regulation section, and the electrolytic solution can be prevented from shorting due to contact between the electrolytic solution and a substrate or device to which the external terminal or the external terminal is connected.
(6) By setting the forming position of the through hole in advance assuming the range in which the thin-walled portion X is generated on the flat plate surface with respect to the hardness of the rubber material, the size of the external terminal and the rivet, or the pressing force. The formation load of the sealing plate can be reduced.

FIG. 4 shows an example of the external appearance of the capacitor according to the first embodiment.
For example, as shown in FIG. 4, in the capacitor 20, the opening 24 of the case 22 that houses the capacitor element 30 (FIG. 5) is sealed by the sealing plate 2. In the sealing plate 2, the rubber layer 4 is exposed to the outside of the case 22, and the resin layer 6 is disposed inside the case 22.
The end of the case 22 is folded back on the side of the opening 24 of the case 22, and the flat portion is covered along the outer peripheral surface of the sealing plate 2. In addition, a caulking portion in which a part of the case is recessed is formed on the side surface of the case 22 in accordance with the peripheral surface of the sealing plate 2 disposed in the case 22, and the sealing plate 2 in the case 22 is pressed. Or, the sealing plate 2 is placed in the recess, and the arrangement position of the sealing plate 2 is fixed.

In the sealing plate 2, for example, four through holes 12 are formed at positions sandwiching the anode terminal 8a and the cathode terminal 8b, and the gas passing through the through holes 12 is allowed to pass through the rubber layer 4 and discharged out of the capacitor Do.

The case 22 is, for example, a bottomed cylindrical container as shown in FIG. 5, and includes a storage portion for storing therein the capacitor element 30, an electrolyte (not shown), and other components. At the bottom of the case 22, for example, a weak portion having a predetermined shape (not shown) is formed, and the weak portion is broken when the pressure inside the case 22 becomes a predetermined value or more. The fragile portion is set to be broken at a pressure lower than, for example, a value at which the sealing plate 2 is broken. As described above, the capacitor 20 prevents the capacitor itself and the equipment in which the capacitor is installed from being seriously damaged by damaging the intended portion in advance when the internal pressure rises.
The capacitor element 30 is a winding element in which an electrode foil and a separator are wound, and is formed in a size and a shape that can be stored in the storage portion of the case 22. Capacitor element 30 is wound in a predetermined direction in a state where anode foil and cathode foil, which are electrode foils (not shown), for example, are laminated via a separator, which is an insulator. The flat plate portion of the sealing plate 2 is disposed to face the winding end face.
In the capacitor element 30, tabs 32a and 32b respectively project from the anode foil and the cathode foil on the winding surface on one end side, and the tabs 32a and 32b are connected to the anode terminal 8a or the cathode terminal 8b of the sealing plate 2.
<Manufacturing process of capacitor>
As a process of manufacturing the capacitor 20, the capacitor element 30 is housed in the housing portion of the case 22 when the tabs 32a and 32b, the anode terminal 8a and the cathode terminal 8b are connected.
In the case 22, the capacitor element 30 and the like are placed in the housing portion, and then the tip portion 14 on the opening 24 side is folded back to the sealing plate 2 side to make a sealed state.
Besides, the case 22 is brought into close contact with the case plate 22 by pressing the case 22 from the outside with respect to a position close to the lower side of the case plate 2 or a position overlapping with the case plate 2, for example. Let The tip end portion 14 of the case 22 is brought into contact so as to press the rubber layer 4 of the sealing plate 2. Thereby, even if the internal pressure of the capacitor rises, it is possible to prevent the sealing plate 2 from being separated from the case 22.

In the capacitor 20, the electrolytic solution causes a chemical reaction due to use for a long time or a use environment to generate gas, and the internal pressure of the case increases. In response to the rise of the internal pressure, sealing plate 2 takes generated hydrogen gas HG into through hole 12, passes through rubber layer 4, and discharges it by a predetermined amount to the outside of case 22.
When the electrolyte contacts the sealing plate 2 due to the increase in internal pressure of the case 22, the electrolyte is blocked by the rubber layer 4 even if it penetrates into the through hole 12 and flows out of the case 22. It is preventing.

Although the capacitor 20 shown in FIG. 5 is disposed in the case where the opening 24 is directed upward, the present invention is not limited to this. It also includes the case where the opening 24 is oriented in the lateral direction or downward depending on the device using the capacitor 20.

<Effect of Example 1>

According to such a configuration, the following effects can be obtained in addition to the effects shown in the first embodiment.

(1) Since the sealing plate 2 is disposed without a gap with respect to the case 22 and the electrolytic solution is blocked by the rubber layer 4 of the sealing plate 2, it is possible to prevent the electrolytic solution and the like from spouting outside the case 22.

(2) By folding the end portion 14 of the case 22 and pressing the rubber layer 4 of the sealing plate 2, the end face side periphery of the sealing plate 2 can be firmly integrated with the case 22.

(3) While the sealing plate 2 and the case 22 are integrated, the gas pressure adjusting portion formed by the through hole 12 and the rubber layer 4 can suppress an increase in the internal pressure of the case 22, thereby extending the life of the capacitor 20.

Second Embodiment
FIG. 6 shows a configuration example of a sealing plate according to the second embodiment. The configuration shown in FIG. 6 is an example, and the present invention is not limited to such a configuration. Further, in FIG. 6, the same parts as in FIG. 1 to FIG.
The sealing plate 2 has the following configuration as well as the configuration shown in the first embodiment and the first embodiment.
For example, as shown in FIG. 6, the sealing plate 2 has a liquid blocking plug 40 inserted therein for preventing liquid from entering into the through hole 12 which is a gas pressure adjusting portion. The liquid blocking plug 40 is an example of the liquid blocking portion according to the present invention, and the reaction gas generated by the reaction between the capacitor element and the electrolyte permeates, and the liquid component such as the electrolyte does not permeate plastic such as polypropylene or ceramic Or composed of a resin material. The liquid blocking plug 40 may be formed into a predetermined shape, for example, may be inserted into the through hole 12, or may be filled with a liquid or gel resin material in the through hole 12. It may be molded according to the internal shape.

The liquid blocking plug 40 may be filled or inserted into the entire inside of the through hole 12 or may at least block the opening of the through hole 12 facing in the case 22 in which the capacitor element is disposed. As a result, the electrolytic solution flowing toward the opening of the through hole 12, condensed water, and the like can not enter the through hole 12 by the liquid blocking plug 40.
The liquid blocking plug 40 may be formed at the time of manufacturing the sealing plate 2, and for example, after the through hole 12 is formed, the resin material is filled or inserted. In addition, the liquid blocking plug 40 may be filled or inserted with a resin material after installing the rivet 10 on the sealing plate 2 or before installing the sealing plate 2 on the case 22.
Further, in the manufacturing process of the capacitor, in addition to the manufacturing process of the sealing plate 2 described in the first embodiment, a solid liquid blocking plug 40 is inserted into the through hole 12 as the installation processing of the liquid blocking portion. And the liquid or gel resin material may be filled.

<Effect of Second Embodiment>
According to such a configuration, the same effects as those of the first embodiment and the first embodiment can be obtained, and the following effects can be expected.
(1) By preventing the liquid such as electrolyte from invading the through hole 12 by the liquid blocking plug 40, it is possible to prevent the deterioration of the gas pressure control function due to water droplets adhering to the inner wall of the through hole 12 or the surface of the rubber layer 4
(2) By disposing the liquid blocking plug 40 at the opening of the through hole 12, it is possible to prevent the inlet portion of the gas pressure regulating section from being blocked by water droplets.
(3) Sealing is performed by preventing the electrolytic solution in the case 22 from entering the through holes 12 by the liquid blocking plug 40 regardless of the installation state of the capacitor, such as the sealing plate 2 being installed downward or inclined. The gas pressure control function of the plate 2 can be maintained.

FIG. 7 shows a configuration example of a sealing plate according to a second embodiment.
In the sealing plate 2, for example, as shown in A of FIG. 7, a liquid blocking plug 50 which partially protrudes from the opening of the through hole 12 is used. For example, one end side of the liquid blocking plug 50 is inserted into the through hole 12, and the other end side is disposed so as to protrude from the opening of the through hole 12.
For example, as shown in FIG. 7B, the liquid blocking plug 50 includes a blocking portion 52 inserted into the through hole 12 and a liquid separation portion 54 protruding from the opening.

The blocking portion 52 is a portion that blocks at least the opening side of the through hole 12 and prevents the electrolyte from entering the through hole 12. Between the blocking portion 52 and the rubber layer 4, for example, a space corresponding to the length and the insertion amount of the liquid blocking plug 50 is formed.
The liquid separation portion 54 is an example of a functional portion that prevents the liquid from staying on the opening of the through hole 12 or the blocking portion 52 installed in the opening. The liquid separation portion 54 is formed to extend to the inside of the case with respect to the blocking portion 52. That is, the liquid separation portion 54 is formed so as to protrude from the surface of the sealing plate 2 so as to separate the water droplets generated in the case from the surface of the resin layer 6 and make it difficult to stay. Further, the liquid blocking plug 50 can have a large surface area with respect to the inside of the case by the liquid separating portion 54 protruding more than the resin layer 6. Thereby, even if water droplets generated in the case adhere to the surface of the resin layer 6, it is possible to secure a gas transmission path to the blocking portion 52 side in the through hole 12.

The blocking portion 52 and the liquid separation portion 54 are functionally divided with the opening of the through hole 12 as a boundary, and the length thereof is determined by the insertion amount of the liquid blocking plug 50. Further, the liquid blocking plug 50 is not limited to one in which the blocking portion 52 and the liquid separating portion 54 are integrally formed, but may be configured by separate members and integrated at the opening of the through hole 12.

The entire length of the liquid blocking plug 50 may be formed shorter, for example, with respect to the depth of the through hole 12, that is, the thickness of the resin layer 6, or the same length or longer than the through hole 12. You may Inside the through hole 12, for example, the tip of the liquid blocking plug 50 may be brought into contact with the rubber layer 4, or the insertion amount is adjusted so as to form a space between the liquid blocking plug 50 and the rubber layer 4. do it.
In the process of inserting the liquid blocking plug 50 into the through hole 12, the liquid separation portion 54 may be formed outside the through hole 12.

[Effect of Example 2]
According to such a configuration, the same effects as those of the above-described embodiment can be obtained, and the following effects can be expected.
(1) By partially projecting the liquid blocking plug 50 from the through hole 12, the liquid attached to the surface of the sealing plate 2 does not easily cover the entire liquid blocking plug 50, and the gas pressure regulating portion through the through hole 12 Function can be secured.
(2) A part of the liquid blocking plug 50 may be protruded from the through hole 12, and adjustment and management of the filling amount of the resin material and the insertion amount of the liquid blocking plug 50 are unnecessary, and the processing Can be simplified.

FIG. 8 shows a configuration example of a sealing plate according to a third embodiment.
In the sealing plate 2, for example, as shown in A of FIG. 8, a liquid blocking film 60 is provided so as to cover the opening of the through hole 12. The liquid blocking film 60 is an example of the liquid blocking portion of the present invention, and is a resin material having a gas-liquid separation function, and is formed with an area covering at least the opening of the through hole 12 and a predetermined range of the peripheral portion thereof. It is done. The liquid blocking film 60 is in close contact with the surface of the resin layer 6 by a fixing means such as an adhesive (not shown).
For example, as shown in FIG. 8B, the liquid blocking film 60 is formed integrally with the blocking part 62 covering the opening of the through hole 12 and the blocking part 62, and the liquid separation part 64 covering the periphery of the opening Prepare.
The blocking portion 62 and the liquid separation portion 64 are functionally divided with the opening of the through hole 12 as a boundary. The liquid blocking film 60 may be one in which the blocking portion 62 and the liquid separation portion 64 are configured as separate members and integrated at the opening of the through hole 12.

The liquid blocking film 60 may be formed, for example, to have a flat surface directed to the inside of the case (not shown), or may be formed to be inclined such that the central portion protrudes at the top toward the inside of the case. In this case, for example, one side of liquid blocking film 60 is formed parallel to the surface of resin layer 6, and the other side is made different in film thickness toward the center of the opening of through hole 12. Just do it. Thereby, while maintaining a close_contact | adherence state between the resin layers 6, it can prevent that a water droplet stays on the interruption | blocking part 62. FIG.

[Effect of Example 3]
According to such a configuration, the same effects as those of the above-described embodiment can be obtained, and the following effects can be expected.
(1) By covering the opening of the through hole 12 and its peripheral portion with the liquid blocking film 60, it is possible to prevent the liquid attached to the surface of the sealing plate 2 from blocking the through hole 12, and the gas control through the through hole 12 The function of the pressure unit can be secured.
(2) By affixing the liquid blocking film 60 with the through hole 12 as a reference, it is possible to prevent the penetration of water such as the electrolytic solution into the through hole 12 and the processing can be simplified.

Experimental Example 1

Next, an experimental example of the gas pressure controllability of the sealing plate will be shown. FIG. 9 is a diagram showing the results of Experimental Example 1.
In this experiment, the relationship between the formation position of the gas pressure regulation portion of the sealing plate 2 and the adjustment function thereof is measured. Specifically, it is determined by the distance (L1) between the external terminal 8 of the sealing plate 2 and the through hole 12 whether or not the gas pressure regulation unit functions properly.
The capacitor used in this experiment has a size of φ30 × 40 [L], a rating of 450 [V], 390 [μF], electrolytic paper is kraft paper, and the electrolytic solution contains ethylene glycol as a main solvent. The sealing plate 2 sets the distance (L1) between the outermost peripheral portion of the contact portion of the external terminal 8 with the rubber layer 4 and the through hole 12 to 1.0 [mm] and 1.5 [mm], respectively. Five samples each having 2.0 mm and 3.0 mm were prepared.
The test conditions are as follows: a voltage of 450 [WV] is applied at 105 [° C.] in the ambient environment, and 0 [hour] at the start of the experiment, 500 [hours] after the start, 1000 [hours], 2000 [hours], 5000 [Time] The state of liquid leakage of the electrolyte was observed.

Under all conditions, at the start of the experiment, there was no leakage of the electrolyte and no abnormality.
(1) When the distance (L1) between the external terminal and the through hole is 1.0 [mm] After the lapse of 500 hours, for two out of five prepared capacitors, the outside of the rubber layer 4 of the sealing plate 2 A liquid leak was confirmed around the terminal 8.
At the time of 1000 hours, liquid leakage was confirmed around the external terminal 8 of the rubber layer 4 of the sealing plate 2 for three of the three remaining capacitors.
(2) When the distance (L1) between the external terminal and the through hole is 1.5 [mm] The electrolyte did not leak until 1000 [hours] elapsed from the start of the experiment, and no abnormality was found. However, when 2000 hours passed, a liquid leak was confirmed around the external terminal 8 of the rubber layer 4 of the sealing plate 2 for one of the five prepared capacitors. In addition, liquid leakage was confirmed around the external terminal 8 of the rubber layer 4 of the sealing plate 2 for two of the four remaining capacitors after the lapse of 5000 hours.
(3) When the distance (L1) between the external terminal and the through hole is 2.0 [mm] Even after 5000 [hours] from the start of the experiment, the electrolytic solution does not leak into the capacitor and no abnormality occurs. .
(4) When the distance (L1) between the external terminal and the through hole is 3.0 [mm] Even if 5000 [hours] have passed from the start of the experiment, the electrolytic solution does not leak into the capacitor, and no abnormality occurs. .

From the result of this experimental example 1, there is a thin portion X generated by the pressing of the rivet 10 in the range from the installation position of the external terminal to 1.5 mm, and the through hole 12 is in this thin portion X portion. If there is, the electrolyte leaks out from the periphery of the external terminal 8 of the rubber layer 4 of the sealing plate 2 until 2000 [hours] have elapsed from the start of application to the capacitor. This is because the gas generated in the case 22 presses the rubber layer 4 closing the through hole 12 so as to expand toward the outside of the sealing plate 2, but if the through hole 12 is in the thin portion X, the through hole Since the thickness of the rubber layer 4 in the portion covering 12 also becomes thin, it becomes easy to expand. Then, the rubber layer 4 in the portion covering the through hole 12 expands in the direction away from the resin layer 6, so the rubber layer 4 peels off from the resin layer 6 from the periphery of the through hole 12 when the elongation of the rubber layer 4 exceeds the allowable amount. Do. When the peeling reaches the external terminal 8, a liquid discharge path of the electrolytic solution is formed. That is, the electrolytic solution leaks to the outside through the interface between the rubber layer 4 and the resin layer 6 separated from the through hole 12 and the interface between the external terminal 8 and the sealing plate 2, resulting in liquid leakage.
Therefore, as in the present invention, the sealing plate 2 is provided with a gas pressure adjusting portion in a range separated by 2.0 mm or more from the installation position of the external terminal, thereby forming the rubber layer 4 covering the through hole 12. Since the thickness does not decrease, the rubber layer 4 does not expand outward even by the internal pressure of hydrogen gas generated in the inside of the case, and the peeling between the rubber layer 4 and the resin layer 6 is suppressed to prevent liquid leakage. Can be made available for over 5000 hours.

<Experimental Example 2>

Next, an experimental example of the gas pressure controllability of the sealing plate will be shown. FIG. 10 is a diagram showing the results of Experimental Example 2.
In this experiment, the relationship between the formation position of the gas pressure regulation portion of the sealing plate 2 and the adjustment function thereof is measured. Specifically, it is determined by the distance (L5) between the through hole 12 and the portion where the flat portion of the sealing plate and the tip of the case are folded back and in contact with the through hole 12 to determine whether the gas pressure regulating portion functions properly.
The rating and size of the capacitor used in this experimental example 2 and the test conditions are the same as in experimental example 1.
Further, the positions of the through holes formed in the sealing plate 2 are respectively 1.0 (mm), 1.5 (mm), and 2.0 (distances L5) of the rubber layer after caulking to the tip of the case. Five samples each having a setting of 3.0 mm and 3.0 mm were prepared.

The results of this experiment are shown in FIG.
Under all conditions, at the start of the experiment, there was no leakage of the electrolyte and no abnormality.
(1) When the distance (L5) between the tip of the case and the through hole is 1.0 [mm] After 500 [hours], 2 out of 5 of the prepared capacitors are made of the rubber layer 4 of the sealing plate 2 A liquid leak was confirmed in the portion covering the through hole 12.
At the time of 1000 hours, liquid leakage was observed in a portion covering the through holes 12 of the rubber layer 4 of the sealing plate 2 for three of the remaining three capacitors.
Since the through holes are filled with the electrolyte, there are no subsequent measurement results.
(2) When the distance (L5) between the tip of the case and the through hole is 1.5 [mm] The electrolyte did not leak until 500 [hours] elapsed from the start of the experiment, and no abnormality was found. However, when 1000 hours had elapsed, liquid leakage was observed in the portion covering the through hole 12 of the rubber layer 4 of the sealing plate 2 for one of five capacitors prepared. In addition, liquid leakage was confirmed in the portion covering the through holes 12 of the rubber layer 4 of the sealing plate 2 for all the capacitors remaining after the elapse of 2000 hours.
(3) When the distance (L5) between the tip of the case and the through hole is 2.0 [mm] Even if 5000 [hours] have passed from the start of the experiment, the electrolyte does not leak into the capacitor, and no abnormality occurs. The
(4) When the distance (L5) between the case tip and the through hole is 3.0 [mm] Even if 5000 [hours] have passed from the start of the experiment, the electrolytic solution does not leak into the capacitor, and no abnormality occurs. The

From the result of this experimental example 2, there is a thin portion X formed by caulking by the case end portion in the range from the case end portion to 1.5 mm, and the through hole 12 is in this thin portion X The electrolyte leaks from the portion covering the through holes 12 of the rubber layer 4 of the sealing plate 2 until 2000 [hours] elapse from the start of the application to the capacitor. This is because the gas generated in the case 22 presses the rubber layer 4 closing the through hole 12 so as to expand toward the outside of the sealing plate 2, but if the through hole 12 is in the thin portion X, the through hole Since the thickness of the rubber layer 4 in the portion covering 12 also becomes thin, it becomes easy to expand. Then, the rubber layer 4 in the portion covering the through holes 12 swells in the direction away from the resin layer 6, so that when the elongation of the rubber layer 4 exceeds the allowable amount, a crack occurs in the portion covering the through holes 12 of the rubber layer 4 When the electrolyte leaks to the outside, a liquid leak occurs. Further, as described above, when the elongation of the rubber layer 4 exceeds the allowable amount, the rubber layer 4 peels off from the resin layer 6 from the periphery of the through hole 12, and when the peeling reaches the outer terminal 8 or the sealing plate 2, electrolysis There are cases where a liquid discharge path is formed.
Moreover, compared with the result of Experimental example 1, regardless of the difference between the pressing member pressing the rubber layer of the sealing plate whether the external terminal or the case tip, the result of the liquid leakage with respect to the distance to the through hole and the elapsed time is the same. Or something close to it. That is, the gas pressure regulating portion of the sealing plate depends on the distance at which the thin portion X is formed.
Therefore, as in the present invention, the sealing plate should have a gas pressure regulation portion in a range separated by 2.0 mm or more from the contact position of the external terminal with the rubber layer and the contact position of the tip of the case. Thus, the function of discharging hydrogen gas generated inside the case can be maintained, and the condenser can be made available for 5000 hours or more.

<Experimental Example 3>

Next, an experimental example of the state of the gas pressure regulation function is shown. FIG. 11 shows the measurement results of Experimental Example 3, and FIG. 12 shows the degree of expansion of the capacitor case.
In this experiment, the relationship between the gas pressure regulation function and the expansion state in the capacitor case is measured. Specifically, from the expansion state of the capacitor case, judgment of the effect of the gas pressure regulation function of the sealing plate 2 and maintenance of the gas pressure regulation function by the liquid blocking portion are judged.

In this experimental example 3, the size is φ30 × 40 [L], the rating is 450 [V], 390 [μF], the electrolytic paper is kraft paper, and the electrolytic solution uses ethylene glycol as a main solvent. . The sealing plate 2 has a distance (L1) of about 8.2 mm between the through hole 12 and the external terminal 8, and a distance (L5) of about 4.2 mm between the through hole 12 and the case tip. And Further, the sealing plate 2 has a hollow through hole 12 in the resin layer 6 (first embodiment) as a configuration on the experiment side, and a silicon resin as a liquid blocking portion 40 in the through hole 12. What was enclosed (2nd Embodiment) and what the opening part of the through-hole 12 and its peripheral part were covered by PP (polypropylene) tape (Example 3) is prepared.
In addition, as the sealing plate 2, as the experimental comparative example, a plate without the through hole 12 (Comparative Example 1) and a plate in which the electrolytic solution penetrated into the through hole 12 (Comparative Example 2) were prepared.
Under each condition, five capacitors are used.
The test conditions were as follows: a voltage of 450 WV was applied at 105 ° C. in the ambient environment, and the amount of expansion of the case after 0 hours at the start of the experiment, 250 hours after the start, and 500 hours. And calculate the average value of 5 pieces.

The results of this experiment are shown in FIG.
(1) In the configuration shown in the second embodiment in which the silicone resin is sealed in the through hole 12, the case expansion amount after 250 hours is 0.53 mm, and after 500 hours. The amount of case expansion was 0.58 mm.
(2) In the configuration shown in Example 3 in which the opening of the through hole 12 is covered with a PP tape, the amount of case expansion after 250 hours is 0.6 mm, and after 500 hours. The amount of case expansion was 0.6 mm.
(3) In the configuration shown in the first embodiment in which the opening of the through hole 12 is opened, the case expansion amount after 250 hours is 0.52 mm, and after 500 hours The amount of case expansion of the case became 0.52 [mm].
(4) In Comparative Example 1 using the sealing plate without the through holes, the case expansion amount after 250 hours is 0.67 mm, and the case expansion amount after 500 hours is 0 It became .74 [mm].
(5) In Comparative Example 2 in which the electrolyte penetrates into the through hole 12, the case expansion amount after 250 hours is 0.65 mm, and the case expansion after 500 hours has elapsed. The amount was 0.7 mm.

The change of the case according to the passage of time is shown in FIG.
Such a measurement result is, for example, as shown in FIG. 12, in the configuration provided with the through hole 12, Example 3 (measurement result (2)) and the first embodiment (measurement result (3)), After 250 hours from the start of the experiment by applying a voltage to the capacitor, the amount of expansion of the case is maintained at the same level regardless of the passage of time. That is, expansion of the case is suppressed by discharging the gas generated in the case by the gas pressure regulation function including the through hole 12.

In the second embodiment (measurement result (1)), although the expansion of the case proceeds between 250 [hours] and 500 [hours], comparative examples 1 and 2 which do not have the gas pressure regulation function (measurement The amount of expansion of the case is smaller than the results (4) and (5). From this result, it is shown that as the amount of expansion is larger, the gas is not transmitted, the internal pressure is increased, and the bottom of the case is expanded.

Comparing the first embodiment (measurement result (3)) with comparative example 1 (measurement result (4)), the gas pressure regulation function including the through hole 12 and the rubber layer 4 releases the gas inside the case It has been shown that it does not inflate the case.
In addition, the second embodiment (measurement result (1)) and the third example (measurement result (2)) including the gas pressure regulation unit and the comparison example 2 (measurement result (5)) show penetration It was revealed that the gas pressure regulation function is reduced or not to function due to the electrolyte solution intruding into the hole 12.

From the experimental example 3 described above, by providing the sealing plate 2 with the gas pressure adjusting portion, it is clear that the expansion of the case can be suppressed by the gas generated by the operation of the condenser. In addition, it has been confirmed that the water pressure regulation function may be deteriorated by the penetration of water such as the electrolyte solution into the through holes 12 constituting the gas pressure regulation function.
Therefore, as in the present invention, when there is a possibility that the electrolytic solution intrudes into the sealing plate 2 depending on the use condition, installation environment and installation condition of the capacitor, the liquid pressure shut-off unit is provided to the gas pressure regulation unit. Is desirable.

Other Embodiments

The features and modifications of the embodiment described above will be listed below.

(1) In the above-mentioned embodiment, although the case where opening shape of penetration hole 12 which is a gas pressure regulation part was circular was shown, it does not restrict to this. The through holes 12 may be formed in a polygonal shape other than a circular shape.
(2) The plurality of through holes 12 formed in the sealing plate 2 are not limited to the case where they are all formed with the same diameter. The through holes 12 may have different opening diameters depending on, for example, the positions and the number of the through holes 12.
(3) The through holes 12 may have the numerical aperture, the opening position, and the opening diameter set in accordance with, for example, the hardness of the rubber material forming the rubber layer 4.
(4) Although the case where the through hole 12 is formed by shaving only the resin layer 6 in the manufacturing process of the sealing plate 2 has been shown in the above embodiment, the invention is not limited thereto. In the process of forming the through holes 12, part of the surface side of the rubber layer 4 may be scraped. Thus, the function of the gas pressure regulation section can be exhibited by preventing the resin layer 6 which does not transmit gas from remaining in the through hole 12.

As described above, the most preferable embodiments and the like of the present invention have been described. The present invention is not limited to the above description. Various modifications and changes can be made by those skilled in the art based on the subject matter of the invention described in the claims or disclosed in the mode for carrying out the invention. It goes without saying that such variations and modifications are included in the scope of the present invention.

According to the capacitor of the present invention and the method of manufacturing the same, by forming the gas pressure adjusting portion while avoiding the thin-walled portion formed in the flat portion of the sealing plate, the gas permeation function by the sealing plate can be maintained. It is useful to maintain the life of the capacitor.

2 sealing plate 4 rubber layer 6 resin layer 8 external terminal 8a anode terminal 8b cathode terminal 10 rivet 12 through hole 14 case tip 20 capacitor 22 case 24 opening 30 capacitor element 32a, 32b tab 40, 50 liquid blocking plug 52, 62 Block part 54, 64 Liquid separation part 60 Liquid blocking membrane

Claims (7)

1. A capacitor element,
   A capacitor case for housing the capacitor element;
   A sealing plate sealing the opening of the capacitor case;
   And the sealing plate is
   A laminated body in which a first member that transmits gas and a second member that seals the gas are stacked;
   A pressing portion on which at least a portion of a flat portion of the first member of the laminated body is pressed;
   A through hole formed in the second member of the laminate and the first member covering the through hole at a position not overlapping the thin portion set in a predetermined range around the pressing portion and the pressing portion And a gas pressure regulation unit that regulates the pressure by permeating the gas with the
   A capacitor characterized by comprising:
2. The pressing portion includes a terminal component installed in the laminated body,
   The capacitor according to claim 1, wherein the through hole is formed at a distance of 2.0 mm or more from the installation position of the terminal component.
3. The pressing portion is a contact portion between the end portion side of the capacitor case folded back along the opening side and the first member,
   The capacitor according to claim 1 or 2, wherein the through hole is formed in a range separated by 2.0 mm or more in the central direction of the laminate from the contact position of the end.
4. 4. The liquid crystal display device according to claim 1, further comprising a liquid blocking portion disposed at the opening of the through hole to transmit gas to the through hole and to prevent the liquid from entering. Capacitors described in.
5. The capacitor according to any one of claims 1 to 4, wherein the first member is a rubber material having a hardness of 50 Hs or more and 85 Hs or less according to the standard of JIS K6253.
6. A method of manufacturing a capacitor,
   A process of housing a capacitor element in a capacitor case;
   A pressing portion by which at least a part of a flat portion of the first member of a stacked body in which a first member which transmits gas and a second member which seals gas are stacked is pressed, the pressing portion, and the pressing portion A gas is allowed to pass through the through-hole formed in the second member of the laminate and the first member covering the through-hole at a position not overlapping the thin-walled portion set in a predetermined range around the pressing portion Sealing the capacitor case with a sealing plate including a gas pressure regulation unit for pressure regulation;
   A process of folding the end portion of the capacitor case back to the sealing plate so as to contact the first member at a position separated from the through hole by a predetermined distance or more;
   A method of manufacturing a capacitor comprising:
7. 7. The capacitor according to claim 6, further comprising a process of providing a liquid blocking portion which allows gas to permeate through the through hole and prevents entry of liquid at least in the opening of the through hole. Production method.
   
   

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