JP4432580B2 - Capacitor - Google Patents

Description

  The present invention relates to a capacitor used for regeneration of a hybrid car or a fuel cell car or for power storage.

  FIG. 10 is a cross-sectional view showing the structure of this type of conventional capacitor. In FIG. 10, 20 is a capacitor element, and this capacitor element 20 has a polarizable electrode layer formed on a current collector made of aluminum foil. A pair of electrodes are displaced in opposite directions and wound with a separator interposed therebetween (all not shown), and are connected to the anode and the anode from both end faces (vertical direction in FIG. 10) of the capacitor element 20. The cathode is taken out.

  21 is a metal case made of aluminum containing the capacitor element 20 together with a driving electrolyte (not shown), 21a is a cathode terminal for external connection integrally provided on the bottom surface of the metal case 21, and the cathode of the capacitor element 20 The side end face is mechanically and electrically connected to the inner bottom face of the metal case 21 by means of laser welding or the like.

  22 is an aluminum lid, 22a is an anode terminal for external connection provided integrally with the lid 22, and the end face on the anode side of the capacitor element 20 is joined to the inner surface of the lid 22 by means such as laser welding. So that the periphery of the lid 22 and the opening of the metal case 21 (portion 23 in FIG. 10) are wound together with an insulating member (not shown) interposed therebetween. And sealed (generally called curling).

  The conventional capacitor thus configured has a configuration in which an anode terminal 22a and a cathode terminal 21a for external connection are provided in the central axis direction (vertical direction in FIG. 10) of the metal case 21, and the anode terminal 22a and the cathode By connecting a plurality of capacitors to the terminal 21a using a connecting member 24 called a bus bar (shown in FIG. 11 described later), the capacitor is connected to a plurality of capacitors and used for a vehicle backup power supply or the like. It was a thing.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2000-315632 A

  However, in the above-described conventional capacitor, when a plurality of capacitors are connected as shown in FIG. 11 and used as a capacitor unit, when the anode terminal 22a and the cathode terminal 21a are connected, the terminals are pulled out in opposite directions. As a result, connection work is not only difficult, but connection spaces h1 and h2 are required at both ends, resulting in a problem that a large mounting space is required and miniaturization cannot be achieved.

  Further, in order to solve this problem, as a means for pulling out the anode terminal and the cathode terminal from the same direction, lead members for external lead are respectively provided on a pair of electrodes in which a polarizable electrode layer is formed on a current collector made of aluminum foil. It is possible to draw out the anode terminal and the cathode terminal from the same direction by connecting and winding a pair of electrodes to which the lead members are connected. In order to extract the electrodes from a plurality of locations, there is a problem that the resistance is greatly increased as compared with a structure called end face current collection in which the entire end face of the capacitor element 20 is drawn out. When used as a capacitor unit, it has a problem that it cannot be adopted at all.

  The present invention solves such a conventional problem, and when connecting a plurality of capacitors to be used as a capacitor unit, it can be easily connected, the connection space is reduced, and an unnecessary resistor as a capacitor is also provided. It is an object to provide a capacitor that can be extremely reduced.

In order to solve the above problems, the present invention accommodates a capacitor element in a metal case together with a driving electrolyte, and an opening of the metal case is a sealing plate, and a sealing rubber is disposed on the peripheral edge of the sealing plate. in capacitors consisting, bite into the sealing rubber open end of the metal case by curling, one terminal of a pair of terminals provided on the sealing plate the one electrode located on the opposite directions of the capacitor element connected to, by bonding the other electrode on the inner bottom surface of the metal case, the removal of one of the electrodes of the anode / cathode performed at one of the terminals provided on the sealing plate, the removal of the other electrode performs by connecting the other terminals provided on the metal case and the sealing plate which is connected a capacitor element via a connecting member, one end of the connecting member is a car It is of ring machined configuration so as to welded to the upper end portion of the metal case.

  As described above, the capacitor according to the present invention allows the anode / cathode to be taken out from the capacitor element directly from the end face of the element without using a lead member or the like. Since it is possible to take out the cathode from the same direction, it is possible to halve the connection space between each capacitor when a plurality of capacitors are connected to form a capacitor unit. It is possible to obtain a special effect that it is easy to plan.

(Embodiment 1)
Hereinafter, with reference to the first embodiment, the inventions described in the first to fifth and 12-14 aspects of the present invention will be described.

  FIG. 1 is a cross-sectional view showing a configuration of a capacitor according to Embodiment 1 of the present invention, FIG. 2 is a perspective view thereof, and in FIGS. 1 and 2, 1 is a capacitor, 2 is a capacitor element, and this capacitor element 1 Is a pair of electrodes (not shown) in which a polarizable electrode layer mainly composed of activated carbon and a binder is formed so that an exposed portion of the current collector is formed on one end side of the current collector made of aluminum foil. It is constructed by winding with the separators (not shown) interposed between them so that the exposed portions of the electrical conductors are opposite to each other. In FIG. 1, the upper surface is the anode and the lower surface is the cathode. It is comprised as follows.

  Reference numeral 3 denotes a bottomed cylindrical metal case made of aluminum. The capacitor element 2 is accommodated together with a driving electrolyte (not shown), and the inner bottom surface of the metal case 3 and the cathode side end surface of the capacitor element 2 are laser-welded. It is mechanically and electrically connected by joining by means of metal spraying, brazing, etc. For example, a method of joining by laser welding with a brazing material such as aluminum solder interposed is working This is preferable because excellent results are obtained in terms of properties and bonding strength.

  4 is a sealing plate, and 5 and 6 are screwed anode terminals and cathode terminals implanted in the sealing plate 4, and the bottom surface of the sealing plate 4 is joined to the anode side end surface of the capacitor element 2. Thus, the anode terminal 5 implanted in the sealing plate 4 is electrically connected, and the cathode terminal 6 is insulated from the sealing plate 4.

  Reference numeral 7 denotes an annular sealing rubber. The sealing rubber 7 is fitted in the opening of the metal case 3 together with the sealing plate 4 in a state of being disposed around the upper surface of the sealing plate 4. When the vicinity of the portion is drawn and the opening end is curled and sealed, the opening end of the metal case 3 bites into the sealing rubber 7 so that reliable sealing is performed.

  8 is a conductive connection member. One end of the connection member 8 is joined to the metal case 3 by welding and the other end is joined to the cathode terminal 6 by welding, so that the cathode side of the capacitor element 2 is joined. The cathode is taken out from the cathode terminal 6 through the metal case 3.

  Further, welding is performed in a state where a brazing material such as aluminum solder is interposed on the joint surface between the connection member 8 and the cathode plate 6 provided on the sealing plate 4 and the connection member 8 and the metal case 3, or a capacitor. By joining or dipping the brazing material also on the anode side end face and the cathode side end face of the element 2, it becomes possible to perform dense bonding with excellent welding strength.

  Reference numeral 9 denotes an insulating layer applied to the inner surface of the opening end of the metal case 3, and the insulating electrolyte 9 drips up by a capillary action of a driving electrolyte (not shown) and reacts with the sealing rubber 7 to form the sealing rubber 7. It is provided for the purpose of preventing deterioration.

  The capacitor 1 according to the present embodiment configured as described above is implanted in the sealing plate 4 by joining the anode side end surface of the capacitor element 2 to the bottom surface of the sealing plate 4 (generally called end surface current collection). Connected to the anode terminal 5, the cathode side end face is joined to the inner bottom face of the metal case 3 (generally called end face current collection), and the cathode terminal 6 provided on the metal case 3 and the sealing plate 4 is connected to the connecting member 8. By connecting to the cathode terminal 6, the anode / cathode of the capacitor element 2 is basically taken out by end face current collection, and the cathode side is connected to the cathode terminal 6 through the connecting member 8 at the shortest distance. Therefore, it is possible to realize the low-resistance capacitor 1 that suppresses generation of unnecessary resistance as much as possible.

  Furthermore, since the anode / cathode can be taken out from the same direction by the pair of anode terminal 5 and cathode terminal 6 provided on the sealing plate 4, a plurality of capacitors which have been the conventional problem are continuously connected to the capacitor. When used as a unit, not only is the connection work difficult because each terminal is pulled out in the opposite direction, but connection space is required at both ends, resulting in a large installation space. It will be possible to solve the problem that it cannot be miniaturized at once.

  Therefore, as shown in FIG. 3, when a plurality of capacitors 1 according to the present embodiment are connected using a bus bar 10 and used as a capacitor unit, each terminal is connected when the anode terminal 5 and the cathode terminal 6 are connected. Are drawn out in the same direction, so that not only the connection work becomes very easy, but also the connection space only needs to be h1, so that the installation space can be reduced by half and the size can be reduced. It is.

  In the present embodiment, the cathode side of the capacitor element 2 has been described as being connected from the metal case 3 to the cathode terminal 6 via the connecting member 8, but the present invention is not limited to this. In addition, without using the connecting member 8, the opening end of the metal case 3 can be directly joined to the cathode terminal 6, or the cathode can be taken out directly from the metal case 3.

  In the present embodiment, the anode side of the capacitor element 2 is described as being connected to the anode terminal 5 provided on the sealing plate 4 and the cathode side thereof is bonded to the metal case 3, but the present invention is not limited to this. However, the anode and the cathode may be reversed.

  In this embodiment, the capacitor is described as an example of a cylindrical capacitor. However, the present invention is not limited to this, and the capacitor may be formed in an elliptical shape or a rectangular shape.

(Embodiment 2)
Hereinafter, the invention described in claims 7 to 10 and 15 to 17 of the present invention will be described with reference to the second embodiment.

  In the present embodiment, a part of the capacitor-side extraction structure on the anode side in the first embodiment is different, and the configuration other than this is the same as in the first embodiment. Reference numerals are assigned and detailed description thereof is omitted, and only different portions will be described below with reference to the drawings.

  4 is a cross-sectional view showing a configuration of a capacitor according to Embodiment 2 of the present invention, FIG. 5 is a perspective view of a current collector plate used in the capacitor, and in FIGS. 4 and 5, 11 is made of aluminum. It is a current collector. As shown in detail in FIG. 5, the current collector plate 11 is formed in substantially the same shape as the anode side end surface of the capacitor element 2, and a plurality of current collector plates 11 are directed toward the side joined to the anode side end surface of the capacitor element 2 by laser welding. A rib 11a is provided. The rib 11a is pressed against the anode side end surface of the capacitor element 2, or the anode side end surface of the capacitor element 2 is processed so as to correspond to the rib 11a, and laser welding is performed via the rib 11a. Thus, the current collector plate 11 and the anode side end face of the capacitor element 2 are joined together. In FIG. 5, 11 d is an electrolyte solution passage hole provided in the current collector plate 11.

  When performing this laser welding, welding is performed in a state in which a brazing material such as aluminum solder is interposed between the current collector plate 11 and the anode side end face of the capacitor element 2 to obtain a dense and This makes it possible to perform bonding with excellent welding strength.

  Reference numeral 12 denotes an aluminum lead plate coupled to the current collector plate 11. The lead plate 12 is coupled to the current collector plate 11 by caulking to the first coupling portion 11b, and the second coupling portion. The capacitor element 2 is taken out from the anode terminal 5 by being joined to 11c by ultrasonic welding and the tip portion is joined to the anode terminal 5 by caulking. The lead plate 12 may be provided integrally with the current collector plate 11.

  Reference numeral 13 denotes a fixing member made of rubber, thermoplastic resin, or the like. The fixing member 13 is disposed between the sealing plate 4 and the current collector plate 11 so as to take measures against vibration resistance of the capacitor element 2. If the fixing member 13 is enlarged until it comes into contact with the sealing plate 4 or the inner surface of the metal case 3, the effect can be drawn out more greatly.

  As described above, the capacitor according to the present embodiment can further reduce the resistance by joining the current collector plate 11 to the anode side end surface of the capacitor element 2 by the end surface current collection, and can also provide the sealing plate 4 and the current collector plate. Accordingly, the capacitor 13 having excellent vibration resistance can be provided.

  Although not shown, a thermoplastic fixing agent (for example, APP (isotactic polypropylene)) is provided in the gap between the inner surface of the metal case 3 and the outer surface of the capacitor element 2, or the bottom edge of the metal case 3 is provided. By providing the taper or R, it is possible to provide a capacitor having further excellent vibration resistance.

(Embodiment 3)
The third aspect of the present invention will be described below with reference to the third embodiment.

  In this embodiment, the capacitor element is fixed by a metal case in the capacitor according to the second embodiment. Since the other configuration is the same as that of the second embodiment, the same parts are the same. Reference numerals are assigned and detailed description thereof is omitted, and only different portions will be described below with reference to the drawings.

  FIG. 6 is a cross-sectional view showing the configuration of the capacitor according to the third embodiment of the present invention. In FIG. 6, reference numeral 14 denotes a capacitor element. The capacitor element 14 has an outer shape compared to the capacitor element 2 of the second embodiment. , The outer periphery of which is formed to have substantially the same dimensions as the inner diameter of the metal case 3. 3a is an annular recess formed by drawing the vicinity of the opening of the metal case 3 inward.

  By narrowing the vicinity of the opening of the metal case 3 containing the capacitor element 14 thus formed together with a driving electrolyte solution (not shown) toward the inside to form the recess 3a, the lower end of the recess 3a is ( The upper part of the capacitor element 14 is urged downward (via the current collecting plate 11 and the fixing member 13), and the sealing plate 4 can be positioned by the upper end of the recess 3a contacting the sealing plate 4. Thus, it is possible to exhibit highly accurate assembly and better vibration resistance.

(Embodiment 4)
Hereinafter, the invention described in claims 11 and 16 of the present invention will be described with reference to the fourth embodiment.

  In the present embodiment, the shape of the inner bottom surface of the metal case of the capacitor in the first embodiment is different, and the configuration other than this is the same as in the first embodiment. Reference numerals are assigned and detailed description thereof is omitted, and only different portions will be described below with reference to the drawings.

  FIG. 7 is a perspective view showing the configuration of a metal case used in the capacitor according to Embodiment 4 of the present invention. In FIG. 7, 15 is a metal case, and the metal case 15 includes the cathode side end face of the capacitor element 2 and A plurality of ribs 15a are provided toward the side to be joined by laser welding, and the ribs 15a are pressed against the cathode side end face of the capacitor element 2, or the cathode side end face of the capacitor element 2 is set so as to correspond to the rib 15a. The metal case 15 and the cathode side end face of the capacitor element 2 are joined by laser welding through the rib 15a.

  By configuring in this way, not only can the metal case 15 and the cathode side end face of the capacitor element 2 be bonded more reliably, but also low-resistance bonding can be performed, and When this laser welding is performed, welding is performed in a state where a brazing material such as aluminum solder is interposed between the joint surface of the metal case 15 and the cathode side end surface of the capacitor element 2, thereby providing a dense and weld strength. This makes it possible to perform excellent bonding.

(Embodiment 5)
Hereinafter, the invention according to the third aspect of the present invention will be described with reference to the fifth embodiment.

  The present embodiment is different in the configuration of the connecting member of the capacitor in the first embodiment, and the other configurations are the same as those in the first embodiment. Detailed description will be omitted, and only different parts will be described below with reference to the drawings.

  8 (a) to 8 (c) and FIGS. 9 (a) and 9 (b) are a sectional view showing a configuration of a connecting member used in the capacitor according to the fifth embodiment of the present invention, and a sectional view and a plan view. 8 and 9, reference numerals 8, 8a, 8b, and 8c are conductive connection members. One end of each of the connection members 8, 8a, 8b, and 8c is joined to the metal case 3 by welding, and the other end is a cathode terminal. It is the same configuration that the cathode is taken out from the cathode terminal 6 through the metal case 3 to which the cathode side of the capacitor element 2 is joined by welding to the capacitor 6.

  In FIG. 8A, the connecting member 8 is formed in a staircase shape so as to straddle the upper end surface of the curled metal case 3 (upper end surface in FIG. 8A) and the stepped portion of the cathode terminal 6. Are joined by welding.

  In FIG. 8B, the connecting member 8 a is formed in a stepped shape with an angle, and is formed on the upper end portion of the curled metal case 3 (upper end surface in FIG. 8A) and the upper end surface of the cathode terminal 6. Since the cathode terminal 6 is restrained from the upper surface by fastening a screw (not shown) to the cathode terminal 6 when the capacitor is attached, an extra load is applied to the joined portion. Has the effect of not being added.

  In FIG. 8C, the connecting member 8 b is formed in a stepped shape having an angle, and the metal case 3 is curled so that one end thereof is sandwiched between the opening end of the metal case 3 and the sealing plate 4. The cathode terminal 6 is joined by welding so that the other end is in contact with the upper end surface of the cathode terminal 6, and a screw (not shown) is fastened to the cathode terminal 6 when the capacitor is attached. In addition to the effect that an extra load is not applied to the joint portion in order to suppress the surface from the upper surface, since one end side is sandwiched between the opening end of the metal case 3 and the sealing plate 4, the reliability is more stable. Has the effect of

  9 (a) and 9 (b), the connecting member 8c is formed in a circular shape whose outer shape covers the entire surface of the sealing plate 4, and the peripheral edge of the connecting member 8c is a curled upper end portion (FIG. 9 ( The upper end surface of a) is joined by welding, and the portion that contacts the cathode terminal 6 is formed in a convex shape and joined by welding so as to contact the upper end surface of the cathode terminal 6. In addition, the code | symbol 16 in a figure is a pressure regulation valve.

  By being configured in this manner, when the capacitor is attached, the cathode terminal 6 is suppressed from the upper surface by tightening a screw (not shown) to the cathode terminal 6, so that an extra load is not applied to the joint portion. Since the entire periphery of the connecting member 8c is joined to the upper end portion of the metal case 3 (partial joining may be possible), the connecting member 8c does not try to rotate with screw tightening, and is more reliable. Has the effect of stabilizing.

  In the capacitor according to the present invention, the anode / cathode can be taken out from the capacitor element directly from the end face of the element without using a lead member or the like, so that the resistance can be reduced, and the anode / cathode can be taken out from the outside. Can be taken out from the same direction, so that when connecting a plurality of capacitors to form a capacitor unit, the connection space between the capacitors can be halved. It is useful for regeneration of hybrid cars and fuel cell cars, or for power storage.

Sectional drawing which showed the structure of the capacitor | condenser by Embodiment 1 of this invention Same perspective view Front view of a capacitor unit with multiple capacitors Sectional drawing which showed the structure of the capacitor | condenser by Embodiment 2 of this invention Perspective view of current collector plate used for the capacitor Sectional drawing which showed the structure of the capacitor | condenser by Embodiment 3 of this invention The perspective view which showed the structure of the metal case used for the capacitor | condenser by Embodiment 4 of this invention (A)-(c) Sectional drawing which showed the structure of the connection member used for the capacitor | condenser by Embodiment 5 of this invention (A) Sectional drawing which showed the structure of the connection member used for the capacitor | condenser by Embodiment 5 of this invention, (b) The top view Sectional view showing the structure of a conventional capacitor Front view of a capacitor unit with multiple conventional capacitors connected

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Capacitor 2, 14 Capacitor element 3, 15 Metal case 3a Depression 4 Sealing plate 5 Anode terminal 6 Cathode terminal 7 Sealing rubber 8, 8a, 8b, 8c Connection member 9 Insulating layer 10 Bus bar 11 Current collecting plate 11a, 15a Rib 11b 1st coupling | bond part 11c 2nd coupling | bond part 11d Electrolyte passage hole 12 Lead board 13 Fixing member 16 Pressure control valve

Claims (10)

A capacitor element formed by winding a pair of electrodes in which a polarizable electrode layer is formed on a current collector made of a metal foil, with positions shifted in opposite directions with a separator interposed therebetween, and the capacitor element a bottomed cylindrical metal case housing with driving electrolyte and a sealing plate sealing the opening of the metal case, the capacitor comprising a sealing rubber which is arranged on the top rim of the sealing plate, the The open end of the metal case bites into the sealing rubber by curling , and one of the electrodes of the capacitor element located in the opposite direction is connected to one of the pair of terminals provided on the sealing plate, by joining the other on the inner bottom surface of the metal case, the removal of one of the electrodes of the anode / cathode performed at one of the terminals provided on the sealing plate, Eject the other electrode With the performed by connecting through a connecting member and the other of the terminals provided on the metal case and the sealing plate which is connected to the capacitor element, the upper end portion of the metal case to which one end of the connecting member is curled Capacitors designed to be welded to . The capacitor according to claim 1, wherein a brazing material is interposed between the other terminal provided on the sealing plate and the connecting member and / or the joint surface between the metal case and the connecting member. A polarizable electrode layer constituting the electrode is formed so that an exposed portion of the current collector remains on one end side of the current collector, and the pair of electrodes on which the polarizable electrode layer is formed are exposed portions of the current collector. The capacitor according to claim 1, wherein a capacitor element is formed by winding with separators interposed therebetween so as to be in opposite directions. A current collector plate is joined to the side of the capacitor element that is connected to the terminal provided on the sealing plate of the electrodes located in opposite directions, and the current collector plate is connected to the terminal provided on the sealing plate via the current collector plate. The capacitor according to claim 1 . The capacitor according to claim 4 , wherein a fixing member is disposed between the sealing plate and the current collector plate. The capacitor according to claim 4 , wherein a rib projecting partially is provided on a joint surface of the current collector plate with the capacitor element. The capacitor according to claim 1, wherein a rib projecting partially is provided on a joint surface between the inner bottom surface of the metal case and the capacitor element. The capacitor according to claim 1, wherein a portion of the metal case that contacts the sealing rubber is subjected to insulation treatment. The capacitor according to claim 5 , wherein an insulating treatment is applied to at least a portion of the metal case that contacts the sealing rubber or the fixing member . The capacitor according to claim 1, wherein a thermoplastic fixing agent is provided in a gap between the inner surface of the metal case and the outer surface of the capacitor element .

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