JP2000260664A - Capacitors - Google Patents

Abstract

(57) [Problem] To provide a capacitor which can reduce the internal resistance of the capacitor and can be easily produced even when both the cathode and anode terminals are taken out in the same direction. SOLUTION: A winding member 1 which is formed by interposing a separator between a pair of electrodes so that end faces of a pair of flat electrodes project in opposite directions and winding these, An electrolytic solution impregnated in the winding member 1, a case 8 accommodating the winding member 1, and a sealing member 10 for closing an opening of the case 8 are provided. A metal current collecting terminal 5, which is configured so that a pair of electrodes is drawn out from the same direction on an end face of the electrode.
6, the internal resistance can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor used for various electronic devices.

[0002]

2. Description of the Related Art A conventional capacitor of this type will be described with reference to the drawings.

FIG. 10 is a sectional view showing the structure of a conventional capacitor, and FIG. 11 is an exploded perspective view showing the structure of a winding member used in the capacitor.

In FIG. 11, reference numerals 26a and 26b denote a pair of flat electrodes, 27a to 27d denote lead plates connected to the pair of flat electrodes 26a and 26b, and 28 denotes a separator. By winding a pair of flat electrodes 26a and 26b to which 27a to 27d are connected with a separator 28 interposed therebetween,
A winding member 29 is configured.

In FIG. 10, reference numeral 29 denotes a winding member to which the lead plates 27a to 27d are connected, 30 denotes a bottomed cylindrical case in which the winding member 29 is housed, and 31 denotes a case inside the case 29. A winding member fixing member arranged on the bottom surface,
32 is a terminal plate for sealing the opening of the case 30, 33
Are mounted on the terminal plate 32 and the lead plates 27a to 27
d, a terminal for external connection connected to the terminal plate 3
The pressure valve mounted on 2, and the O-ring 35, the conventional condenser was configured in this way.

[0006]

However, in the case of the capacitor having the above-described structure, when the internal resistance of the capacitor is to be reduced in a situation where the market demand for lowering the resistance of the capacitor has been increasing in recent years, the lead plate has to be reduced. 27
And a method of optimizing the connection positions of the lead plates 27a to 27d. Here, in the former method of increasing the number of lead plates 27, the resistance of the pair of electrodes 26a and 26b constituting the winding member 29 can be reduced as the number of lead plates 27 is increased according to (Equation 1). When connecting the lead plate 27 to the terminal 33 for external connection, a plurality of lead plates 27 must be laminated and connected to the connection portion of the terminal 33 of the lead plate 27,
The number of lead plates 27 that can be connected to the lead plate connection portion of the terminal 33 is limited due to problems such as dimensions in the case 30, connection workability, reliability, and the like, and the number of lead plates 27 cannot be increased unnecessarily. There were challenges.

In the latter method of optimizing the connection position of the lead plates 27a to 27d, for example, the distance between the plurality of connected lead plates 27a to 27d is made equal, and the ends of the electrodes 26a and 26b are If the distance between the lead plates 27a closest to the ends of the electrodes 26a and 26b is １ ／ of the distance between the connected lead plates 27a to 27d, a pair of electrodes 26a, 26b
Is ideal, but when they are actually wound, a plurality of lead plates 27a to 27d pulled out from each of the pair of electrodes 26a and 26b are used.
Are the lead plates 27a-2 as going outward from the center.
The position of 7d was shifted. Therefore, the latter method has a problem that the resistance values of the pair of electrodes 26a and 26b increase more than ideal.

Further, the present inventor has disclosed in Japanese Patent Application No. 09-3225.
In the capacitor proposed in No. 96, in the case of using a bottomed cylindrical case and taking out both the cathode and anode terminals in the same direction, the internal structure becomes complicated and mass production is difficult. There was a problem that.

The present invention solves such a conventional problem,
It is an object of the present invention to provide a capacitor which can reduce the internal resistance and can be easily produced even when both the cathode and anode terminals are taken out in the same direction.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a pair of flat electrodes with a separator interposed therebetween, and the end faces of the respective electrodes project in opposite directions. A hollow winding member formed by winding, and a hollow second member in which a flat portion formed in a brim shape with a terminal portion for external connection is joined to one end surface of the winding member. 1 and a central portion of the winding member and the central portion of the first current collecting terminal, and are pulled out in the same direction as the external connection terminal portion provided on the first current collecting terminal. A second current collecting terminal having a brim-shaped flat portion provided with a terminal portion for external connection and joined to the other surface of the winding member; and a housing for accommodating the winding member together with a driving electrolyte. A bottom cylindrical case, and outer casings provided at the first current collecting terminal and the second current collecting terminal. Provided a through hole terminal portion for connection is inserted is obtained by a structure comprising a sealing member sealing the opening of the case.

According to the present invention, the volume resistance of a pair of electrodes in a capacitor can be reduced, and production can be easily performed even when both the cathode and anode terminals are taken out in the same direction.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first aspect of the present invention, a pair of flat electrodes are wound with a separator interposed therebetween and the end faces of the respective electrodes project in opposite directions. A hollow winding member formed by turning, and a hollow first member in which a flat portion formed in a brim shape with a terminal portion for external connection is joined to one end surface of the winding member. And a central part of the winding member and the central part of the first current collecting terminal, which are inserted through the central part of the first current collecting terminal and drawn out in the same direction as the external connection terminal provided on the first current collecting terminal. A second current collecting terminal having a brim-shaped flat portion provided with a connecting terminal portion and joined to the other surface of the winding member, and a bottomed bottom housing the winding member together with a driving electrolyte; A cylindrical case and external connection terminals provided on the first and second current collecting terminals. A through-hole through which the sub-portion is inserted is formed by a sealing member that seals the opening of the case. With this configuration, a current collecting terminal made of metal is joined to the end face of the electrode of the winding member. Therefore, the current collecting terminal serves as a conventional lead plate and an external terminal, and since the current collecting terminal is disposed on the end surface of the winding member, the volume resistance of the pair of electrodes can be reduced. It has the effect of being able to. Further, there is an effect that both terminals of the anode and the cathode can be easily drawn out on one end face of the capacitor.

According to a second aspect of the present invention, in the first aspect of the present invention, a pair of flat electrodes is formed on a current collector made of a metal foil or a conductive polymer at one end of the current collector. According to this configuration, an electrode formed by forming a polarizable electrode layer made of a mixture of activated carbon, a binder, and a conductive agent so that an exposed portion of the conductor is formed,
It can be used as an electric double layer capacitor using an electric double layer formed at the interface of the polarizable electrode layer, and can be used as a secondary power supply for motor drive requiring large capacity and low resistance Even when charging or discharging with a large current due to a decrease in the internal resistance of the electric double layer capacitor, the voltage range of the rapid down or up portion of the voltage during charging and discharging can be reduced, so that the capacitor with a larger current It has the effect of being able to charge and discharge in the battery.

According to a third aspect of the present invention, in the first aspect, an electrode foil made of a metal foil having a metal oxide film on the surface is used as the pair of flat electrodes. According to this configuration, for example, when the metal material of the electrode is aluminum, it can be used as an aluminum electrolytic capacitor, and it can be mainly used as an aluminum electrolytic capacitor for inverter circuits that require high ripple current. Since the heat generation of the product when a large current is applied can be reduced due to the decrease in the internal resistance of the aluminum electrolytic capacitor, the ripple current can be made higher than that of the conventional aluminum electrolytic capacitor.

According to a fourth aspect of the present invention, in the first aspect of the invention, instead of the separator interposed between the pair of flat electrodes and the electrolyte impregnated in the separator,
It is a configuration using a functional polymer molecule or a composite member composed of a separator and a functional polymer. According to this configuration, it can be used as a functional polymer capacitor, and the conventional winding type A capacitor having a lower impedance than that of the functional polymer capacitor can be provided, and since there is no use of a driving electrolyte, there is no life degradation mode caused by dry-up, and the capacitor has a longer life.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the flange-shaped flat portion joined to the end faces of the winding members of the first current collecting terminal and the second current collecting terminal is provided. Each of them is configured as an independent part, and this independent part and the first
In this configuration, the current collecting terminal and the remaining portion of the second current collecting terminal are joined to each other. According to this configuration, both the anode and the cathode terminals are easily pulled out to one end face of the cylindrical capacitor. As a result, conventional product design dimensions such as the sealing aperture position and narrowing dimensions, as well as the product dimensions such as sealing member dimensions and case dimensions can be easily commercialized without significant changes. In addition, by using the remaining part of the current collecting terminal having a terminal part for external connection as the winding core of the winding member, the winding can be wound tighter than in the case where there is no core material, thereby reducing winding deviation. Since the distance between the electrodes can be reduced, the internal resistance of the capacitor can be reduced.

According to a sixth aspect of the present invention, in accordance with the fifth aspect of the present invention, there is provided a component having a terminal portion for external connection, and a flange-shaped flat portion joined to an end face of the winding member being an independent component. A part of the sealing member is integrally formed at a portion in contact with the sealing member of the first current collecting terminal. According to this configuration, the sealing is integrally formed with the remaining portion of the first current collecting terminal. Sealing is possible by joining a part of the member and the sealing member, and has an effect of reducing the number of components required for sealing the capacitor.

According to a seventh aspect of the present invention, in the invention according to any one of the first to sixth aspects, a flange-shaped flat portion or a current collecting terminal joined to an end face of a winding member of the current collecting terminal. It is configured to have a slit-shaped or hole-shaped missing part on the same plane part of an independent part separated from
According to this configuration, for example, in a case where the current collecting terminal is joined to the wound member by a metal spraying method, as a method, the current collecting terminal is pressed against the wound member, and a predetermined portion is melted from the current collecting terminal side. The end of the missing part of the flat part of the current collecting terminal and the exposed part of the current collector of the winding member abutting on this end are joined using the sprayed metal as a medium. Therefore, when joining the current collecting terminal to the winding member by a metal spraying method, the missing part of the flat portion of the current collecting terminal is indispensable, and in the case of other joining methods, At the time of impregnation of the wound member with the electrolytic solution in the next step, the missing portion of the flat part of the current collecting terminal has an effect that it becomes one infiltration path for the electrolytic solution to enter the wound member. Have.

According to an eighth aspect of the present invention, in the invention according to any one of the first to sixth aspects, a flange-shaped flat portion or a current collecting terminal joined to an end face of a winding member of the current collecting terminal. In this configuration, a corrugated or raised uneven portion is provided on the same plane portion of an independent component that is separated from the component, and according to this configuration, after the current collecting terminal is joined to the winding member, When the electrolytic solution is impregnated into the winding member, which is a step, the wavy or raised uneven portion of the current collecting terminal has an effect of forming one infiltration path for the electrolytic solution to enter the winding member.

According to a ninth aspect of the present invention, in the first aspect of the present invention, the case is formed in a rectangular tube having a bottom.
According to this configuration, for example, when the capacitor is used as a bank in which the capacitors are densely arranged in series, if the bank of the capacitor is repeatedly charged and discharged with a current of several tens of A or more, heat is generated inside the capacitor. However, when the case is cylindrical, the contact area between the sides of the capacitor case is smaller than when the case is square, so that heat can be easily radiated to the outside.On the other hand, when the case is square, The internal gap is larger than in the case of a cylindrical shape.For example, when the electrolytic solution is decomposed due to an overvoltage applied to the capacitor and sudden gas generation occurs, the internal pressure rise of the case can be reduced, so the sealing plate is The operation time of the connected pressure valve can be delayed. Also, when using a case with a bottomed or open both ends, a structure in which both anode and cathode terminals are provided on one end surface of the capacitor, or an anode terminal is provided on one end surface of the capacitor And a capacitor having a structure in which a cathode terminal is disposed on the other end surface, and thereby,
This has the effect of being able to respond to the connection status between the capacitor and the electric circuit.

According to a tenth aspect of the present invention, in the first aspect, the case, the sealing member, and the nut are made of a metal or a polymer material. When used, it is possible to close the case by the drawing method of the case generally used as the current sealing member, it does not require a significant change in the sealing method, and when the sealing member is a metal member, Insulation is required at the contact surface between the terminal portion of the current collecting terminal and the sealing member made of the above-mentioned metal by insulation treatment or insertion of an insulating member. However, joining such as arc welding of the above-mentioned metal sealing member and the case made of the metal is performed. According to this configuration, heat generated inside the capacitor due to charging / discharging or the like can be transferred to the outside by using a metal having good heat conductivity for the sealing member. Radiating facilitate and those that reduce the number of parts such as an O-ring. Further, even when a case made of a polymer is used, the case can be sealed by a drawing method, and when the sealing member is a polymer member, the ultrasonic wave of the sealing member made of the polymer and the case made of the polymer are used. Joining such as welding is possible, and the number of parts such as O-rings can be reduced. In addition, the nut is usually a nut made of metal, but when using a nut made of a polymer and using a sealing member made of a polymer, the nut and the sealing member are joined by ultrasonic welding or the like. And the number of parts such as O-rings can be reduced.

According to an eleventh aspect of the present invention, in the first aspect of the invention, the winding member is molded with an exterior resin instead of the case.
Since it is not necessary to seal the case by drawing as in the conventional case and it is possible to seal the wound member at the same time as the resin molding, the number of production steps can be reduced compared to the conventional case, and it has been conventionally required It is possible to reduce operations such as setting a sealing dimension at the time of product switching in the sealing step, and to improve the productivity.

According to a twelfth aspect of the present invention, in the first or ninth aspect, a projection for fixing a winding member is provided on an inner bottom surface of the case. The bottom of the inner surface of the capacitor and the current collecting terminal in contact with it can be fixed, and the stress on the current collecting terminal attached to the sealing member side can be reduced even when vibration is applied from the outside to the capacitor This has the effect of improving the seismic resistance of the product and improving the heat radiation to the outside even when internal heat is generated when the capacitor is used.

According to a thirteenth aspect of the present invention, in the first or the fifth aspect of the present invention, the winding member is fixed to a flat portion in a direction opposite to a flat portion joined to the winding member of the second current collecting terminal. According to this configuration, the bottom portion of the inner surface of the bottomed case and the current collecting terminal in contact therewith can be fixed, and the sealing member can be provided even when vibration is applied to the capacitor from the outside. The stress on the current collecting terminal attached to the side can be reduced, so that the product's seismic resistance can be improved, and even if internal heat is generated when using a capacitor, the heat dissipation to the outside can be improved. It has the effect of being able to.

According to a fourteenth aspect of the present invention, in the first or the fifth aspect of the present invention, the flat portion to be joined to the winding member of the current collecting terminal is subjected to a process for enhancing absorption of laser light. According to this configuration, for example, in a flat plate portion in contact with the winding member of the current collecting terminal, a process for enhancing absorption of laser light on a surface in a direction opposite to a surface in contact with an end surface of the winding member, for example, an electrochemical process. After etching, metal oxide deposition, or blasting, the surface on which the treatment was performed is irradiated with laser light and welded to the end face of the capacitor element. In addition, since laser light is well absorbed, welding can be performed with low energy, and the laser light irradiation interval can be shortened to improve the productivity.

According to a fifteenth aspect of the present invention, in the first aspect, the current collector terminal and the winding member are joined by at least one of metal spraying, welding, brazing, and adhesion using a conductive adhesive. In the case of metal spraying, the current collector terminal is pressed against the winding member as a method, and the predetermined portion is melted from the current collector terminal side. Injected metal powder that was
According to this method, even when the winding member is displaced, strong joining can be performed by a simple operation, thereby enabling smooth production. Further, in the case of welding, as a method, a current collecting terminal is pressed against the wound member, and a predetermined portion is irradiated with a laser from the current collecting terminal side to join the portion, for example, according to this method. Easy to control, when impregnating the wound member after collecting the current collecting terminal with the electrolyte, the electrolyte around the winding member after collecting the current collecting terminal easily enters the inside of the winding member. Thus, the next step of impregnation with the electrolytic solution can be performed in a short time. In the case of brazing or bonding using a conductive adhesive, a joining member is arranged between the current collecting terminal and the winding member and connected, so that the joining portion can be easily controlled in the same manner as in the above-described welding. When the electrolytic solution is impregnated into the wound member after the current collecting terminal is joined, the electrolytic solution around the wound member after the current collecting terminal is easily infiltrated into the inside of the wound member. Thus, the next step of impregnation with the electrolytic solution can be performed in a short time. As an example of the case of further using together, for example, metal spray bonding is a method in which a metal powder is sprayed and bonded, and there is a porous portion in a bonding portion, but when a conductive material is filled and solidified. This has the effect that the connection resistance between the electrode and the current collecting terminal can be further reduced, whereby the internal resistance of the capacitor can be further reduced.

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

(Embodiment 1) FIG. 1 is a sectional view showing the structure of a capacitor according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of a winding member used in the capacitor, and FIG.
FIG. 4 is a perspective view of a state where a current collecting terminal is joined to the wound member. In FIG. 1, reference numeral 1 denotes a winding member, and 5 denotes a winding member 1.
A first current collecting terminal 6 joined to one end face of the winding member 1, a second current collecting terminal joined to the other end face of the winding member 1,
The first and second current collecting terminals 5 and 6 are provided with terminal portions 5a and 6a for external connection, respectively, and have flat portions 5b and 6b, and by inserting the terminal portion 6a of the second current collecting terminal 6 into the central hollow portion of the first current collecting terminal 5 via the insulating member 7, a pair of terminals can be taken out from the same direction. It is what was constituted.

Reference numeral 8 denotes a bottomed cylindrical case for accommodating the winding member 1 together with a driving electrolyte (not shown), and reference numeral 8a denotes an inner bottom surface of the case 8 for positioning and fixing the winding member 1. The protrusion 6c is positioned on the second current collecting terminal 6 so as to fit into the protrusion 8a provided on the case 8 via the insulating member 9 (a capacitor can be formed without the protrusion). This is a fixing engagement portion. 10 is the first
Is a sealing member provided with a through hole through which the terminal portion 5a of the current collecting terminal 5 is inserted to seal the opening of the case 8, 11 is a nut, 12 is a pressure valve, and 13 is an O-ring.

FIG. 2 is an exploded perspective view showing the structure of the winding member 1. In FIG. 2, reference numeral 2 denotes a pair of electrodes, and the pair of electrodes 2 has exposed portions 2a and 2b of the current collector in opposite directions. The polarizable electrode layers 3a and 3b made of a mixture of activated carbon, a binder, and a conductive agent are formed so as to protrude from the pair of electrodes 2. A separator 4 is interposed between the pair of electrodes 2 configured as described above. The winding member 1 is configured by being wound in a state in which the winding member 1 is wound.

FIG. 3 is a perspective view showing a state in which a current collecting terminal is joined to the end surface of the winding member 1, that is, the exposed portions 2a and 2b of the current collector. The flat portion 5b of the current collecting terminal 5 is connected to the second current collecting terminal 6 on the other end surface.
Are joined together, and a pair of terminal portions 5a, 6a are taken out from the same direction.

As described above, in the present embodiment, the winding member 1
The separator 4 is interposed between the pair of electrodes 2 so that the exposed portions 2a and 2b of the current collector in the pair of electrodes are opposite to each other, and these are wound. Metal first and second current collecting terminals 5 and 6 configured so that a pair of electrodes are drawn out from the end surfaces of the electrodes protruding in opposite directions from each other in the same direction.
Are bonded by using at least one of metal spraying, welding, brazing, and adhesion using a conductive adhesive to reduce the volume resistance of the pair of electrodes 2. Calculating and comparing the volume resistance of the electrode of the present invention and the conventional electrode, the size of each pair of electrodes 2 is 98 mm × 36.
When an aluminum foil having a thickness of 00 mm and a thickness of 0.022 mm (aluminum resistivity = 0.0265) is used, the exposed portions 2a and 2b of the current collecting terminals of the electrode 2 projecting in the opposite direction as the winding member 1 of the present invention are used. First and second each made of metal
When the current collecting terminals 5 and 6 are joined, the volume resistance of the entire aluminum foil forming the pair of electrodes 2 is represented by (Equation 1).
Is calculated to be about 0.02 mΩ. On the other hand, when a pair of electrodes of the same size are used and four lead plates are respectively drawn out from the pair of electrodes at equal intervals as in the related art, a pair of electrodes is formed. Similarly, the volume resistance of the entire aluminum foil to be calculated is calculated to be about 0.46 mΩ using (Equation 1).
As is apparent from the results, in the present invention, the volume resistance of the pair of electrodes 2 can be reduced, and the internal resistance of the capacitor can be reduced.

[0033]

(Equation 1)

Therefore, when this is applied to an electric double layer capacitor, the voltage range of the suddenly decreasing portion or increasing portion of the voltage in charging and discharging can be reduced even when charging or discharging with a large current. Can be charged and discharged with a higher current.When this is applied to an aluminum electrolytic capacitor, the heat generated by the product when a large current is applied can be reduced. It is possible to provide a capacitor with lower impedance than the conventional wound type functional polymer capacitor, when it is applied to a functional polymer capacitor.
Since no electrolytic solution is used, there is no life degradation mode due to dry-up, and the life of the capacitor can be extended.

As shown in FIG. 1, the first and second current collecting terminals 5 and 6 of the embodiment have a through-hole at the center, The terminal portion 5a for external connection protrudes in the direction opposite to the surface in contact with the winding member 1, and the second current collecting terminal 6 projects the terminal portion 6a for external connection in the same direction as the surface in contact with the winding member 1, and Terminal part 6 for external connection
Reference symbol a denotes a configuration in which the winding member 1 is configured such that the center cavity of the winding member 1 and the through hole provided in the first current collecting terminal 5 are inserted through the insulating member 7. If
Both the anode and cathode terminals can be easily pulled out on one end face of the cylindrical capacitor, and as a result, the conventional product design dimensions such as the sealing aperture position, the aperture dimension, sealing member dimensions, case dimensions, etc. The dimensions of each member of the product can be easily commercialized without any major change.

(Embodiment 2) FIG. 4 is a sectional view showing a structure of a capacitor according to a second embodiment of the present invention.
In the present embodiment, the flange-shaped flat portion joined to the end surface of the winding member provided integrally with the first and second current collecting terminals of the capacitor of the first embodiment is provided as a separate independent member. The point configured as a part and the remaining part of the current collecting terminal excluding the flat part are used as a core when manufacturing a winding member, and other configurations are the same as those of the first embodiment. Since they are the same, the same portions are denoted by the same reference numerals, and detailed description thereof will be omitted. Only different portions will be described in detail.

In FIG. 4, reference numeral 17 denotes a hollow disk-shaped current collector joined to the exposed portions 2a and 2b of the current collector on the end face of the winding member 1, and 14 and 15 denote centers of the current collector 17 respectively. First and second current collecting terminals inserted and joined to the holes, 16 is an insulating member, and 18 is a sealing member joined to the first current collecting terminal 14.

The first and second current collecting terminals 14 and 15 are provided with terminal portions 14a and 15a for external connection, respectively, and are provided at the center of the first current collecting terminal 14 via an insulating member 16. By inserting the terminal portion 15a of the second current collecting terminal 15 into the through hole, the pair of terminal portions 14a and 1
5a is taken out.

As described above, according to the present embodiment, both the anode and cathode terminals can be easily pulled out from one end face of the cylindrical capacitor as in the first embodiment. Conventional product design dimensions, such as the sealing aperture position and narrowing dimensions, and sealing member dimensions, case dimensions, and other individual component dimensions of the product can be easily commercialized without significant changes.

Further, the rod-shaped first current collecting terminal 14 (which may be the second current collecting terminal 15) having the terminal portion 14a for external connection is used as the winding core of the winding member 1 so that the core is formed. Compared to the case where no material is used, it is possible to reduce the winding deviation because it can be wound tightly and to reduce the internal resistance of the capacitor because the distance between the electrodes can be shortened.

Further, when the current collecting plate 17 is joined to the exposed portions 2a and 2b of the current collector on the end face of the winding member 1, the current collecting plate 17 is an independent part, and thus the surroundings are obstructed. Since there is no object (the first and second current collecting terminals 14 and 15), the joining operation is facilitated and the workability can be improved.

(Embodiment 3) FIG. 5 is a sectional view showing the structure of a current collecting terminal according to a third embodiment of the present invention. 1
A part of the sealing member is formed integrally with the current collecting terminal of
The other configuration is the same as the second embodiment,
The same portions are denoted by the same reference numerals, and detailed description thereof will be omitted. Only different portions will be described in detail.

In FIG. 5, reference numeral 19 denotes a first current collecting terminal having a through hole at the center and a terminal portion 19a for external connection provided at one end, and the first current collecting terminal 19 has one point in the figure. As shown by the dashed line, a portion 19b of the sealing member is integrally provided at a position where the sealing member is joined.

With such a configuration, when the first current collecting terminal 19 is used as a core of the winding member 1, or when the first current collecting terminal 19 is used in the hollow portion of the winding member 1. The current collector plate 17 can be joined to the exposed portion 2a of the current collector on the end face of the winding member 1 even in a state of being inserted into the winding member 1, thereby increasing the degree of freedom of the assembling work.

Furthermore, by joining the sealing member with a part 19b of the sealing member integrally formed with the first current collecting terminal 19, sealing is possible, and components such as O-rings necessary for sealing the capacitor are required. Points can be reduced.

(Embodiment 4) FIGS. 6 and 7 are perspective views showing the structure of a current collector according to a fourth embodiment of the present invention. This embodiment is similar to the second and third embodiments. In the capacitor of the second embodiment, a cutout portion or an uneven portion is provided on a flat portion which is in contact with the winding member of the current collector plate, and the other configuration is the same as that of the second and third embodiments. Are denoted by the same reference numerals, detailed description thereof will be omitted, and only different portions will be described in detail.

In FIG. 6, reference numeral 20 denotes a current collecting plate, and a flat portion of the current collecting plate 20 which is in contact with the winding member 1 is provided with a cutout portion 20a such as a slit or a hole. With this configuration, for example, when the current collecting plate 20 is joined to the winding member 1 by a metal spraying method, as a method, the current collecting plate 20 is pressed against the winding member 1 and a predetermined amount is applied from the current collecting plate 20 side. The metal powder in the form of a molten metal is sprayed onto the portion, and the end face of the missing portion 20a of the flat portion of the current collector plate 20 and the exposed portions 2a and 2b of the current collector in the winding member 1 contacting the end face are formed. Since the joining is performed by using the sprayed metal as a medium, when the current collecting plate 20 is joined to the winding member 1 by the metal spraying method, the missing portion 20a of the flat portion of the current collecting plate 20 is indispensable. . Further, in the case of another joining method, when the electrolytic solution is impregnated into the winding member 1 in the next step, the electrolytic solution permeates the winding member 1 through the missing portion 20a of the flat portion of the current collector plate 20. It becomes one intrusion route.

FIG. 7 shows another example.
In the figure, reference numeral 21 denotes a current collecting plate, and a flat portion in contact with the winding member 1 of the current collecting plate 21 has a configuration in which a corrugated or raised uneven portion 21a is provided. When the electrolytic solution is impregnated into the winding member 1, which is the next step after the current collecting plate 21 is joined to the winding member 1, the corrugated or raised uneven portion 2 of the current collecting plate 21 is formed.
Reference numeral 1a denotes one infiltration path through which the electrolytic solution infiltrates the winding member 1.

In the present embodiment, the current collecting plate 20
Alternatively, the configuration in which the missing portion 20a or the uneven portion 21a is provided in the 21 has been described as an example, but the present invention is not limited to this. For example, as in the first embodiment, the winding member 1 In the first and second current collecting terminals 5, 6 provided integrally with the flat portions 5b, 6b joined to the exposed portions 2a, 2b of the current collector, the same missing portions 2 are formed in the flat portions 5b, 6b.
It goes without saying that the same effect can be obtained even if the 0a or the uneven portion 21a is provided.

(Embodiment 5) FIG. 8 is a sectional view showing a structure of a capacitor according to a fifth embodiment of the present invention.
In this embodiment, instead of the projection for fixing and fixing the winding member provided on the inner bottom surface of the case of the capacitor of the second embodiment, a projection for fixing and fixing the winding member is provided on the current collector plate. Since the configuration other than the above is the same as that of the second embodiment, the same portions are denoted by the same reference numerals, detailed description thereof will be omitted, and only different portions will be described in detail.

In FIG. 8, reference numeral 22 denotes a second current collecting terminal provided with a terminal portion 22a at one end and inserted into a through hole of the first current collecting terminal 14, and 24 is bonded to the second current collecting terminal 22. In the second current collector plate, a protrusion 24 a is provided on the periphery of the second current collector plate 24 so as to be in contact with the inner bottom surface of the case 23.

With such a configuration, the inner bottom surface of the bottomed case 23 and the current collecting plate 24 in contact therewith can be fixed, and even when external vibration is applied to the capacitor, the sealing member is closed. The stress on the current collecting plate 17 attached to the 18 side can be reduced, so that the product can be improved in seismic resistance, and even if internal heat is generated when using a capacitor, the heat radiation to the outside is improved. That can be done.

In this embodiment, as in the above-described fourth embodiment, a second current collecting terminal integrally provided with a flat portion 6b joined to the exposed portion 2b of the current collector of the winding member 1. 6
It is needless to say that the same effect can be obtained by using.

(Embodiment 6) FIG. 9 is a sectional view showing a structure of a capacitor according to a sixth embodiment of the present invention.
The present embodiment has a configuration in which the winding member to which the first and second current collecting terminals are joined is covered with an exterior resin, instead of the case and the sealing member of the capacitor of the second embodiment. Since the other configuration is the same as that of the second embodiment, the same portions are denoted by the same reference numerals, and detailed description thereof will be omitted. Only different portions will be described in detail.

In FIG. 9, 25 is an exterior resin, and 25a is a projection for positioning and fixing the winding member 1 provided on the inner bottom surface of the exterior resin. Since sealing by processing is not required and the winding member 1 can be sealed at the same time as being molded with the exterior resin 25, the number of production steps can be reduced as compared with the conventional case.
In addition, it is possible to reduce the labor required for setting the sealing dimensions at the time of product switching in the sealing process, which was conventionally required, thereby improving productivity and reducing costs by reducing the number of parts used. is there.

[0056]

In the capacitor of the present invention configured as described above, the current collecting terminal serves as a conventional lead, and the current collecting terminal is disposed on the end face of the winding member. Can reduce the volume resistance of the electrodes, and when this is applied to an electric double layer capacitor, the voltage range of the rapid down or up portion of the voltage in charging / discharging is reduced even when charging or discharging with a large current. This makes it possible to charge and discharge the capacitor with a larger current, and if this is applied to an aluminum electrolytic capacitor, it can reduce the heat generation of the product when a large current is applied. Ripple current can be made higher than that of a conventional aluminum electrolytic capacitor. In addition, when this is applied to a functional polymer capacitor, it can provide a capacitor with lower impedance than the conventional wound-type functional polymer capacitor. There is no life deterioration mode, and the life of the capacitor can be extended.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a capacitor according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a winding member of the capacitor according to the embodiment.

FIG. 3 is a perspective view showing a state in which a current collecting terminal is joined to the winding member in the embodiment.

FIG. 4 is a sectional view showing a capacitor according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing a current collecting terminal according to a third embodiment of the present invention.

FIG. 6 is a perspective view showing a current collector according to a fourth embodiment of the present invention.

FIG. 7 is a perspective view showing a current collector according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view showing a capacitor according to a fifth embodiment of the present invention.

FIG. 9 is a sectional view showing a capacitor according to a sixth embodiment of the present invention.

FIG. 10 is a sectional view showing the configuration of a conventional capacitor.

FIG. 11 is an exploded perspective view showing a winding member of a conventional capacitor.

[Explanation of symbols]

 Reference Signs List 1 Winding member 2 A pair of electrodes 2a, 2b Exposed portions of current collector 3a, 3b Polarizing electrode layer 4 Separator 5 First current collecting terminal 6 Second current collecting terminal 5a, 6a Terminal portion 5b, 6b Flat portion 6c Engaging portion 7, 9 Insulating member 8 Case 8a Projection 10 Sealing member 11 Nut 12 Pressure valve 13 O-ring 14 First current collecting terminal 15 Second current collecting terminal 14a, 15a Terminal portion 16 Insulating member 17 Current collecting plate Reference Signs List 18 sealing member 19 first current collecting terminal 19a terminal portion 19b part of sealing member 20, 21 current collecting plate 20a missing portion 21a uneven portion 22 second current collecting terminal 22a terminal portion 23 case 24 second current collecting plate 24a protrusion 25 exterior resin 25a protrusion

Claims (15)

[Claims] 1. A hollow winding member formed by winding a pair of plate-like electrodes with a separator interposed therebetween and end faces of the respective electrodes projecting in opposite directions. A hollow first current collecting terminal having a flange-shaped flat portion provided with an external connection terminal portion joined to one end surface of the winding member; a central portion of the winding member; It is formed in a brim shape with an external connection terminal portion that is inserted through the center of the first current collection terminal and is drawn in the same direction as the external connection terminal portion provided on the first current collection terminal. A second current collecting terminal having a flat portion joined to the other surface of the winding member, a bottomed cylindrical case for housing the winding member together with a driving electrolyte, the first current collecting terminal, The case is provided by providing a through hole through which a terminal portion for external connection provided in the second current collecting terminal is inserted. Composed of a sealing member that seals the opening of (1). 2. A pair of plate-like electrodes, activated carbon and a binder such that an exposed portion of the current collector is formed at one end of the current collector on a current collector made of a metal foil or a conductive polymer. The capacitor according to claim 1, wherein an electrode formed by forming a polarizable electrode layer made of a mixture of a conductive agent and a conductive agent is used. 3. The capacitor according to claim 1, wherein an electrode foil made of a metal foil having a surface provided with a metal oxide film is used as the pair of flat electrodes. 4. A composite member comprising a functional polymer molecule or a separator and a functional polymer, instead of a separator interposed between a pair of plate-like electrodes and an electrolytic solution impregnated in the separator. A capacitor according to claim 1. 5. The flange-shaped flat portions joined to the end surfaces of the winding members of the first current collecting terminal and the second current collecting terminal are configured as independent components, respectively, and the independent component and the first The capacitor according to claim 1, wherein the current collecting terminal and the remaining portion of the second current collecting terminal are respectively joined. 6. A portion which has a terminal portion for external connection and which comes into contact with a sealing member of a first current collecting terminal, wherein each of the brim-shaped flat portions joined to the end face of the winding member is constituted as an independent component. 6. The capacitor according to claim 5, wherein a part of the sealing member is integrally formed. 7. A slit-shaped or hole-shaped cut-off portion is provided in a flange-shaped flat portion joined to an end face of a winding member of a current collecting terminal or in a flat portion of an independent component separated from the current collecting terminal. The capacitor according to claim 1. 8. A corrugated or raised uneven portion is provided on a brim-shaped flat portion joined to the end face of the winding member of the current collecting terminal or on the same flat portion of an independent component separated from the current collecting terminal. Item 7. The capacitor according to any one of Items 1 to 6. 9. The capacitor according to claim 1, wherein the case has a shape of a bottomed rectangular tube. 10. The capacitor according to claim 1, wherein the case, the sealing member, and the nut are made of a metal or a polymer material. 11. The capacitor according to claim 1, wherein the winding member is molded with an exterior resin instead of the case. 12. The capacitor according to claim 1, wherein a projection for fixing a winding member is provided on an inner bottom surface of the case. 13. The capacitor according to claim 1, wherein a projection for fixing the winding member is provided on a plane portion of the second current collecting terminal opposite to the plane portion joined to the winding member. 14. The capacitor according to claim 1, wherein a flat portion of the current collecting terminal, which is joined to the winding member, is subjected to a process for enhancing absorption of laser light. 15. The method according to claim 1, wherein the current collecting terminal and the winding member are joined using at least one of metal spraying, welding, brazing, and adhesion using a conductive adhesive. Capacitors.