JP2012089689A - Capacitor and capacitor module using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve the heavy current and high capacity of a capacitor used for a hybrid vehicle, etc.SOLUTION: A capacitor has its structure in which a welded electrode processing part 1a is provided in at least part of an anode electrode 2 or a cathode electrode 3 exposed on each end surface of an element 1 from which a pair of lead plates 5 and 6 are pulled out in the same direction and electrodes which are closely adjacent to each other in a laminated state from the center of the element 1 to the outer periphery are electrically connected, thereby preventing the concentration of current only at the part at which the anode lead plate 5 and the cathode lead plate 6 of the anode electrode 2 and the cathode electrode 3 are connected, enabling the current to be dispersed in the whole electrodes and achieving the heavy current and high capacity by substantially reducing the resistance of the electrodes.

Description

  The present invention relates to a capacitor used for regeneration of various electronic devices and hybrid vehicles, or for storing electric power, and a capacitor module using the same.

  FIG. 10 is a cross-sectional view showing the structure of this type of conventional capacitor. In FIG. 10, reference numeral 25 denotes an element, and this element 25 has an anode foil 25a and a cathode foil 25b with a separator 25c interposed therebetween. It is comprised by winding by. A plurality of lead lead plates 26 are connected to the anode foil 25a and the cathode foil 25b at a predetermined interval, respectively, and the plurality of lead lead plates 26 are gathered at a predetermined position for each of the same poles. Are drawn out in pairs from one end face of the.

  27 is a cylindrical outer case with a bottom containing the element 25 together with an electrolyte solution (not shown), 28 is a fixing member made of polypropylene resin provided in the outer case 27, and 29 is used to seal the opening of the outer case 27. A phenolic resin sealing plate 30 is a terminal attached to the sealing plate 29, and is electrically connected to the terminal 30 by caulking the pair of lead lead plates 26. (Patent Document 1).

  FIG. 11 is a cross-sectional view showing another configuration of a conventional capacitor. In FIG. 11, 31 is a capacitor element, and 32a and 32b are a pair of lead-out lead plates led out from the capacitor element 31. FIG. Reference numeral 33 denotes a sealing member in which a rubber 33a and a resin plate 33b are laminated and integrated. The sealing member 33 passes through a pair of aluminum metal rivets 34a and 34b, and one end of the pair of metal rivets 34a and 34b. A pair of external connection terminals 35a and 35b are connected to the part, and the pair of lead lead plates 32a and 32b are caulked to the other end part via aluminum metal washers 36a, 36b, 37a and 37b. Are electrically connected.

  The capacitor element 31 and the sealing member 33 thus integrated are impregnated with an electrolytic solution (not shown) in the capacitor element 31, and then a fixing material 38 is put inside and a lateral drawing process is performed in the vicinity of the opening. The sealing member 33 is fixed by being curled in the open end of the metal case 39 (Patent Document 2).

  Further, the lead lead plate 26 shown in FIG. 10 (same as the lead lead plates 32a and 32b shown in FIG. 11) is connected to the aluminum foil which is a current collector constituting the anode foil 25a and the cathode foil 25b. In order to improve the resistance component and reduce the resistance component, the connection portion is formed by partially removing an electrode layer (not shown) formed on the current collector and exposing the aluminum foil (patent document). 3).

  As prior art document information related to the invention of this application, for example, Patent Document 1, Patent Document 2, and Patent Document 3 are known.

JP-A-2-265231 JP 2000-357638 A Japanese Patent Laid-Open No. 8-83738

  However, in the above conventional capacitor, the electrode layer is partially removed to expose the aluminum foil as a current collector, and then a plurality of lead lead plates 26 are connected to the anode foil 25a and the cathode foil 25b, respectively. Although the resistance component is reduced by improving the resistance (Patent Document 3), the electrode leads from the wound element 25 (31) are connected to the anode foil 25a and the cathode foil 25b, respectively. Since it is a thing (patent document 1, patent document 2) of the structure made to perform via the lead board 26 (32a, 32b), there existed a subject that a resistance component was large fundamentally.

  For this reason, it is difficult not only to increase the current and capacity of a single capacitor, but also to increase the current and capacity by making a capacitor module by connecting a plurality of capacitors. Since a large number of capacitors are required for the application, the resistance component becomes too large. As a result, with such a capacitor, it is difficult to connect a plurality of capacitors to produce a capacitor module. I had it.

  In addition, as another problem, when trying to cope with an increase in current and capacity, the amount of gas generated by the reaction of the electrolyte inside the capacitor also increases, so a measure to escape this gas to the outside is required. There was also a new problem.

  The present invention solves such a conventional problem, enables a large current and a large capacity by reducing resistance, and allows gas generated inside the capacitor to escape to the outside. It is an object of the present invention to provide a capacitor and a capacitor module using the same, which can be connected to a large current and a large capacity by producing a capacitor module by connecting a plurality of capacitors.

  In order to solve the above-mentioned problems, the present invention is such that an anode electrode and a cathode electrode connected with a lead plate are wound with a separator interposed therebetween, and only the anode electrode is exposed on one end surface, and the cathode is exposed on the other end surface. An element configured such that only a pair of electrodes are exposed and a pair of lead plates connected to each of the electrodes is drawn out in the same direction, and a pair of leads connected to the pair of lead plates drawn out from the elements. A wire case, a metal case containing the element together with an electrolyte, and a sealing rubber having a hole through which the pair of lead wires are inserted and fitted into an opening of the metal case to seal the element. In this configuration, an electrode processing part is provided in which at least one of the anode electrode and the cathode electrode exposed on the end face is electrically connected to each other in close contact with the laminated state from the center of the element toward the outer periphery. That.

  As described above, the capacitor according to the present invention has a configuration in which the electrode processing portion is provided on at least one of the anode electrode or the cathode electrode exposed on each end face of the element, and thus the current concentrates only on the portion where the lead plate of the electrode is connected. Since the current can be distributed over the entire electrode, the resistance of each electrode can be greatly reduced to increase the current and capacity. Is.

  Further, the gas generated inside the capacitor is configured by connecting a lead wire to each of the pair of lead plates drawn out from the element and sealing the metal case with a sealing rubber having a hole through which the lead wire is inserted. Can be released to the outside through the sealing rubber, so that it is possible to cope with an increase in current and capacity.

(A) The top view which showed the structure of the capacitor by Example 1 of this invention, (b) The front sectional drawing, (c) The bottom view (A) The perspective view from the upper part side which showed the element used for the capacitor, (b) The perspective view from the lower part side, (c) The expansion | deployment perspective view from the upper part side (A) A plan view showing an anode electrode used in the element of the capacitor, (b) a plan view showing a cathode electrode used in the element, and (c) a state before winding of the element. Plan view (A) Current distribution diagram showing the result of simulating the current distribution dispersed and flowing in the electrodes constituting the capacitor element in comparison with the conventional product, (b) Plan view of the electrode of the embodiment used for the simulation. (C) Plan view of the conventional electrode Explanatory drawing which showed the result of having simulated the change of the resistance value by the size of the electrode processing part provided in the element of the capacitor (A) The perspective view from the upper side which showed the state which connected the lead wire to the element used for the capacitor, (b) The perspective view which showed the lead wire connected to the element (A) The perspective view from the upper side which showed the other element used for the capacitor, (b) The top view which showed the anode electrode used for the element, (c) The cathode electrode used for the element Plan view showing The top view which showed the other example of the connection state of the electrode and lead board which comprise the element of the capacitor (A) The top view which showed the structure of the capacitor module by Example 2 of this invention, (b) The front view Sectional view showing the structure of a conventional capacitor Sectional drawing which showed the other structure of the conventional capacitor

  Hereinafter, the invention described in the first to seventh aspects of the present invention will be described with reference to Example 1.

  1A to 1C are a plan view, a front sectional view, and a bottom view showing the configuration of the capacitor according to the first embodiment of the present invention, and FIGS. 2A to 2C are elements used in the capacitor. 3 is a perspective view from the upper side, a perspective view from the lower side, a developed perspective view from the upper side, and FIGS. 3A to 3C are plan views showing an anode electrode used in the capacitor element. FIG. 6 is a plan view showing a cathode electrode used in the element and a plan view showing a state before winding of the element.

  1 to 3, reference numeral 1 denotes an element. As shown in detail in FIG. 2, the element 1 has a strip-like anode electrode 2 to which an anode lead plate 5 is connected and a strip-like shape to which a cathode lead plate 6 is connected. The anode lead plate 5 and the cathode lead plate 6 are drawn out in the same direction as a pair. Is. Reference numeral 1a denotes an electrode processing portion in which a part of each end face of the element 1 is laser-welded to electrically connect closely contacting electrodes. Details of the electrode processing portion 1a will be described later.

  Further, as shown in detail in FIG. 3, the band-like anode electrode 2 is formed on the surface of a current collector 2a made of a metal foil such as aluminum, except for a current collector exposed portion 2b at one end, and a polarizable electrode layer 2c. In addition, the strip-like cathode electrode 3 is exposed to the current collector at one end on the surface of a current collector 3a made of a metal foil such as aluminum as in the case of the anode electrode 2. The polarizable electrode layer 3c is formed except for the portion 3b.

  Then, as shown in FIG. 3C, the current collector exposed portion 2b provided at one end of each electrode in which the belt-like anode electrode 2 and the belt-like cathode electrode 3 thus configured are arranged in opposite directions. 3b are arranged at both ends, are superposed with their positions shifted, and are wound with a separator 4 interposed therebetween, whereby the current collector exposed portion 2b of the anode electrode 2 and the current collector of the cathode electrode 3 are wound. The body exposed portions 3b are exposed at the opposing end surfaces. That is, only the anode electrode 2 is exposed at one end face of the element 1, and only the cathode electrode 3 is exposed at the other end face.

  An anode lead plate 5 is connected to the anode electrode 2, and the anode lead plate 5 is formed by cutting a metal foil such as aluminum into a strip shape. Is connected to the current collector 2a constituting the anode electrode 2 by cold pressure welding or ultrasonic welding (this connection part is obtained by partially removing the polarizable electrode layer 2c to obtain a metal such as aluminum. It is preferable that the current collector 2a made of foil is exposed in order to reduce the contact resistance and stabilize the connection strength.

  Similarly to the anode electrode 2, a cathode lead plate 6 is connected to the cathode electrode 3. The cathode lead plate 6 is formed by cutting a metal foil such as aluminum into a strip shape. The cathode lead plate 6 is connected to a current collector 3a constituting the cathode electrode 3 by cold pressure welding or ultrasonic welding (in this connection portion, the polarizable electrode layer 3c is partially connected). It is preferable that the current collector 3a made of a metal foil such as aluminum is exposed so that the connection resistance can be reduced and the connection strength can be stabilized.

  Further, when the cathode lead plate 6 connected to the cathode electrode 3 is overlapped with the anode electrode 2 through the separator 4 as shown in FIG. 3C, the collector exposed portion of the anode electrode 2 is exposed. In order to prevent a short circuit due to contact with 2b, an insulation treatment is applied to the portion of the cathode lead plate 6 connected to the cathode electrode 3 that is in contact with the current collector exposed portion 2b of the cathode lead plate 6. Specifically, it is preferable to apply an insulating resin (not shown) or to apply an insulating tape (not shown).

  The anode electrode 2 (current collector exposed portion 2b) and the cathode electrode 3 (current collector exposed portion 3b) exposed at each end face of the element 1 thus configured are welded (or crushed (sedge). ) May be processed) to provide an electrode processing portion 1a in which electrodes closely connected in a laminated state are electrically connected from the center of the element 1 toward the outer periphery (see FIGS. 2A and 2B). ) It is what you are configuring.

  By providing such an electrode processing portion 1a on both end faces of the element 1, current is supplied only to a portion where the anode lead plate 5 of the anode electrode 2 is connected and a portion where the cathode lead plate 6 of the cathode electrode 3 is connected. Since the current is not concentrated and the current can be dispersed throughout the anode electrode 2 and the cathode electrode 3, the resistance of each electrode (the anode electrode 2 and the cathode electrode 3) is greatly reduced to increase the current. The capacity can be increased, and this effect will be described in more detail with reference to FIGS.

  4 (a) to 4 (c) are current distribution diagrams showing the result of simulating the current distribution dispersed and flowing in the electrodes constituting the capacitor element according to the present embodiment, and a current distribution diagram used for this. FIG. 4B is a plan view of the electrode of the embodiment and a plan view of the electrode of the conventional product, and the invention product shown in FIG. 4B shows the developed anode electrode 2 as an example, and the anode lead plate 5 is connected to the anode electrode 2. In addition, a plurality of welding marks 2d constituting the electrode processing portion 1a are formed on the surface side of the current collector exposed portion 2b. On the other hand, the conventional product shown in FIG. 4C has a configuration in which only the anode lead plate 26 is connected to the anode foil 25a.

  In FIG. 4A, the horizontal axis represents the length of the electrode foil, the vertical axis represents the magnitude of the current flowing through the electrode foil, and the magnitude of the current flowing at a plurality of positions in the length direction of the electrode foil. Is what we asked for. As is apparent from this current distribution diagram, in the conventional product, the largest current flows concentratedly on the anode foil 25a of the portion to which the anode lead plate 26 is connected, and the current flowing toward this point approaches zero. On the other hand, in the invention, the anode lead plate 5 is connected because the electrode processing portion 1a (welding mark 2d) in which a part of the end face of the element 1 is welded and the electrodes are electrically connected is provided. In other words, the largest current does not concentrate and flow in the anode electrode 2 in this portion, but a small current distributed over the entire anode electrode 2 flows.

  FIG. 5 is an explanatory view showing the result of simulating the change in resistance value due to the size of the electrode processing portion 1a (the number of welding marks 2d), in which the width W of the polarizable electrode layer 2c is 117 mm. As is clear from this result, the resistance value of the conventional product without the electrode processing portion 1a is 3.02 mΩ, whereas the resistance value of the present invention with the electrode processing portion 1a is 0.54 to 1.04 mΩ. It can be seen that the resistance value decreases as the size of the electrode processing portion 1a increases, but low resistance is realized by providing the electrode processing portion 1a having a predetermined size or more. Is something that can be done.

  Therefore, according to the capacitor of the present invention, it is possible to realize a reduction in resistance by providing the electrode processing portions 1a on both end faces of the element 1, thereby increasing current and capacity with a simple configuration. There is an exceptional effect that can be achieved.

  6A and 6B are a perspective view from the upper side showing a state in which a lead wire is connected to the element 1 and a perspective view showing a lead wire connected to the element, in FIG. Reference numeral 1 denotes an element, 1a denotes an electrode processing portion formed on the end face of the element 1, 2b and 3b denote current collector exposed portions formed on both end faces of the element 1, and 5 and 6 denote one of the elements 1 They are an anode lead plate and a cathode lead plate drawn out in pairs from the end face.

  Reference numerals 7 and 8 denote an anode lead wire and a cathode lead wire connected to the anode lead plate 5 and the cathode lead plate 6, respectively. The anode lead wire 7 (the cathode lead wire 8 is also the same) is a copper base tinned iron wire ( (It is generally called CP wire) or a lead portion 7a made of a copper wire and an aluminum rivet 7b. The lead portion 7a is welded to one end of the aluminum rivet 7b. is there.

  Then, the other end side of the aluminum rivet 7b of the anode lead wire 7 thus configured is brought into contact with the anode lead plate 5 drawn out from the element 1, and mechanically and electrically by ultrasonic welding, laser welding, or the like. In this way, the electrodes are led out from the anode lead wire 7 and the cathode lead wire 8 through the anode lead plate 5 and the cathode lead plate 6 drawn out from the element 1, respectively. The element 1 is manufactured.

  9 is an aluminum product containing the element 1 together with an electrolytic solution not shown (in this embodiment, an ethyltrimethylammonium tetrafluoroborate salt dissolved in γ-butyrolactone or propylene carbonate was used as the electrolytic solution). It is a bottomed cylindrical metal case.

  1 illustrates an example in which the element 1 is directly inserted into the metal case 9, but in this case, the collector exposed portion of the cathode electrode 3 exposed on one end face of the element 1 is described. 3b may come into contact with the inner bottom surface of the metal case 9 and current may flow through the metal case 9. Therefore, in order to prevent such a phenomenon, the inner bottom surface of the metal case 9, the element 1 and It is preferable to dispose an insulating member (not shown) such as insulating paper between them.

  Reference numeral 10 denotes a sealing rubber. The sealing rubber 10 is provided with holes through which the anode lead plate 5 drawn out from the element 1, the anode lead wire 7 connected to the cathode lead plate 6, and the cathode lead wire 8 are inserted. The pair of lead wires (anode lead wire 7 and cathode lead wire 8) are inserted into the holes and fitted into the opening of the metal case 9, and then the outer peripheral surface near the opening of the metal case 9 is formed. The metal case 9 is sealed by compressing the sealing rubber 10 by drawing into an annular shape (horizontal drawing part 9a) and curling the open end of the metal case 9 into an annular shape (curling part 9b). It is what you are trying to do.

  In this embodiment, isobutylene isoprene rubber (IIR) is used as the material of the sealing rubber 10, and this IIR does not permeate the electrolytic solution, but allows the gas generated inside the capacitor to escape to the outside. This is preferable because it is possible. However, the present invention is not limited to this, and an ethylene propylene terpolymer (EPT) having a similar characteristic or a mixture of isobutylene isoprene rubber (IIR) and ethylene propylene terpolymer (EPT) is used. But that's fine.

  The capacitor according to this embodiment configured as described above is welded to the anode electrode 2 and the cathode electrode 3 exposed on each end face of the element 1 in which the pair of lead plates 5 and 6 are drawn in the same direction, The anode lead plate 5 of the anode electrode 2 is connected by the configuration in which the anode electrode 2 that is in close contact with the laminated state from the center of the element 1 or the electrode processing portion 1a that electrically connects the cathode electrodes 3 is provided. Current is not concentrated only on the portion where the cathode lead plate 6 of the cathode electrode 3 is connected, and the current can be dispersed throughout the anode electrode 2 and the cathode electrode 3. This brings about a special effect that the resistance of each electrode (the anode electrode 2 and the cathode electrode 3) can be greatly reduced to increase the current and capacity.

  Further, a metal case using a sealing rubber 10 having a hole through which the lead wires 7 and 8 are inserted by connecting the lead wires 7 and 8 to the pair of lead plates 5 and 6 drawn out from the element 1 respectively. 9 can be sealed, and as a result, the gas generated inside the capacitor can be released to the outside by the sealing rubber 10, which can cope with an increase in current and capacity. It has a special effect of being able to do it.

  Further, the capacitor according to the present embodiment is of a type in which the electrodes are drawn out from the element 1 by using the anode lead plate 5 and the cathode lead plate 6, so that the electrodes are drawn out using lead wires. Although it is easy to reduce the resistance compared to the above, it is possible to further reduce the resistance by using an element having a structure as shown in FIG.

  FIGS. 7A to 7C are a perspective view from the upper side showing the element with the reduced resistance, a plan view showing the anode electrode used for the element, and the element used for the element. 7 is a plan view showing a cathode electrode. In FIG. 7, 11 is an element, 11a is an electrode processing portion provided on each end face of the element 11, 12 is an anode electrode, 13 is a cathode electrode, 14 is an anode lead plate, 15 Indicates a cathode lead plate.

  As shown in FIGS. 7B and 7C, a plurality of anode lead plates 14 and cathode lead plates 15 are connected to the anode electrode 12 and the cathode electrode 13 at predetermined intervals, respectively. The element 11 as shown in FIG. 7A is configured by winding with the separator interposed between the plurality of anode lead plates 14 and the cathode lead plates 15 being pulled out together from predetermined positions. It is comprised as follows.

  The element 11 configured as described above can further reduce the resistance by dispersing current by using a configuration in which each electrode is drawn out using a plurality of lead plates.

  8 is a plan view showing another example of the connection state of the anode electrode 2 and the anode lead plate 5 constituting the element 1 of the capacitor. In FIG. The structure connected only to the collector exposed portion 2b is shown. By doing so, the polarizable electrode of the portion to which the anode lead plate 5 is connected as compared with that described with reference to FIG. Since the operation of removing a part of the layer 2c is not necessary, an effect that productivity can be improved is obtained.

  Although FIG. 8 shows the connection state of the current collector exposed portion 2b of the anode electrode 2 and the anode lead plate 5, the current collector exposed portion 3b of the cathode electrode 3 and the cathode lead plate 6 are connected. Even in this case, the same effect can be obtained. In this case, as shown in FIG. 3 (b), the current collector exposed portion 3b of the cathode electrode 3 is used as the cathode. Since the current flows between the lead plates 6 in the thin current collector 3a, the resistance value is added to the resistance value of the product to increase the resistance value. Since the cathode lead plate 6 having a thickness larger than 3a extends to the current collector exposed portion 3b, the resistance value of the product can be further reduced.

  Further, isobutylene isoprene rubber (IIR) is used as the material of the sealing rubber 10, and the gas generated inside the capacitor is released to the outside by the sealing rubber 10 made of IIR. The electrolyte solution has a feature that the amount of gas generated can be reduced and the deterioration can be suppressed by using a structure in which tetrafluoroborate salt is dissolved in γ-butyrolactone or propylene carbonate. Therefore, the above-described effect can be further enhanced to obtain a synergistic effect. Therefore, it can be said that the combination of the electrolytic solution and the sealing rubber 10 is optimal for the capacitor according to the present invention.

  In this embodiment, the anode electrode 2 exposed on each end face of the element 1 and the cathode electrode 3 are welded, so that the anode electrode is in close contact with the laminated state from the center of the element 1 toward the outer periphery. 2, the example in which the electrode processing part 1a in which the cathode electrodes 3 are electrically connected is provided has been described. However, the present invention is not limited to this, and the electrode processing part 1a may be the anode electrode 2 or the cathode electrode. The effect of reducing resistance can be obtained also by providing only one of the three, and the means for providing the electrode processing portion 1a can be applied by crushing (sedge) processing in addition to welding.

  Further, as another configuration of the electrode processing portion 1a, a metal plate (not shown) is disposed on the electrode processing portion 1a shown in FIG. 2 (the same applies to the electrode processing portion 11a shown in FIG. 7). In this state, it is also possible to constitute the electrode processing portion by welding the metal plate and the end face of the element 1 (11). In this case, current collection is performed from the end face of the element 1 (11). Therefore, it is possible to obtain an effect that it is easy to secure a necessary conductor cross-sectional area.

  In the present embodiment, an electric double layer capacitor has been described as an example of the capacitor according to the present invention. However, the present invention is not limited to this, and activated carbon on a current collector made of aluminum foil. An element is formed using a positive electrode in which a polarizable electrode layer mainly composed of carbon is formed, and a negative electrode in which a polarizable electrode layer mainly composed of a carbon material is formed on a current collector made of copper foil, and includes lithium ions. A capacitor called an electrochemical capacitor having a configuration using an organic electrolytic solution may be used, and further an aluminum electrolytic capacitor may be used. Even in this case, the same effect can be obtained.

  In the following, the second aspect of the present invention will be described with reference to the second embodiment.

  In this embodiment, a capacitor module is formed by integrating a plurality of capacitors described in Embodiment 1 with reference to FIGS. 1 to 8 in parallel, and the configuration of the capacitor used in this capacitor module is as follows. Since they are the same as those of the first embodiment, the same portions are denoted by the same reference numerals and detailed description thereof is omitted, and only different portions will be described in detail with reference to the drawings.

  FIGS. 9A and 9B are a plan view and a front view showing the structure of the capacitor module according to the second embodiment of the present invention. In FIG. 9, reference numeral 16 denotes a capacitor. Although an example in which six 16 are connected in parallel is shown, the present invention is not limited to this, and any number may be used as long as two or more are connected in parallel.

  Reference numeral 17 denotes a printed wiring board. A wiring pattern (not shown) is provided on the printed wiring board 17, and the anode lead wire 7 and the cathode lead wire 8 provided on the capacitor 16 are inserted into the printed wiring board 17, respectively. By soldering, the six capacitors 16 are connected in parallel, and in this state are accommodated in a case 18 (not shown in FIG. 9B), thereby forming a capacitor module 19 according to the present embodiment. It is what has been.

  The capacitor module according to the present embodiment configured as described above exhibits the effects obtained by the capacitor 16 according to the first embodiment as much as possible. By configuring the capacitor module using such a capacitor 16, a large current can be obtained. It is possible to easily achieve a large capacity and a large capacity.

  In this embodiment, the capacitor module 19 is configured by connecting six capacitors 16 in parallel. However, the present invention is not limited to this, and two or more capacitors are used. Needless to say, the capacitor module 16 can be connected in series (corresponding by changing a wiring pattern (not shown) provided on the printed wiring board 17) or a combination of parallel connection and series connection.

  In addition, a plurality of capacitor modules 19 configured in this manner can be integrated by connecting them in series (or connected in parallel), so that a capacitor module can be manufactured. There is a special effect that the capacity can be easily increased.

  The capacitor according to the present invention and the capacitor module using the capacitor have an effect that a large current and a large capacity can be achieved, and are particularly useful in the field of automobiles including hybrid vehicles.

DESCRIPTION OF SYMBOLS 1, 11 Element 1a, 11a Electrode processing part 2, 12 Anode electrode 2a, 3a Current collector 2b, 3b Current collector exposed part 2c, 3c Polarized electrode layer 2d Weld trace 3, 13 Cathode electrode 4 Separator 5, 14 Anode Lead plate 6, 15 Cathode lead plate 7 Anode lead wire 7a Lead portion 7b Aluminum rivet 8 Cathode lead wire 9 Metal case 9a Horizontal drawing portion 9b Curling portion 10 Sealing rubber 16 Capacitor 17 Printed wiring board 18 Case 19 Capacitor module

Claims (9)

A polarizable electrode layer is formed on a current collector made of a metal foil, and an anode electrode and a cathode electrode connected with a lead plate are wound with a separator interposed therebetween, whereby an anode is formed on one end face. An element configured such that only the electrode is exposed, only the cathode electrode is exposed on the other end face, and each lead plate connected to the anode electrode and the cathode electrode is drawn out in a pair in the same direction; A pair of lead wires each having one end connected to a pair of lead plates drawn out from the element, a bottomed cylindrical metal case containing the element together with an electrolytic solution, and a hole through which the pair of lead wires are inserted. A sealing rubber that is fitted into the opening of the metal case and is compressed by processing the vicinity of the opening of the metal case to seal, and at least an anode electrode or a cathode electrode exposed on each end face of the element Capacitor provided with an electrode processing portion in which electrodes that are in close contact with each other in a laminated state are electrically connected to the outer periphery from the center of the element by performing welding processing or crushing (sedge) processing on at least a part of the side . The structure of the element is such that an anode electrode having a polarizable electrode layer formed on a current collector made of aluminum foil except for one end, and a cathode electrode similarly configured are arranged in opposite directions to each other. Current collector exposed portions are arranged at both ends, overlapped with their positions shifted, and wound with a separator interposed therebetween, so that the current collector exposed portions of the anode electrode and the cathode electrode face each other. The capacitor according to claim 1, wherein the capacitor is configured to be exposed at an end face. The capacitor according to claim 2, wherein a portion of the lead plate connected to one of the anode electrode and the cathode electrode that is in contact with the current collector exposed portion of the other electrode is subjected to insulation treatment. The element according to claim 1, wherein a plurality of lead plates are connected to the anode electrode and the cathode electrode at predetermined intervals, respectively, and the plurality of lead plates are collectively pulled out from a predetermined position for each same pole. Capacitor. The capacitor according to claim 1, wherein an insulating member is disposed between the inner bottom surface of the metal case and the element. The sealing rubber according to claim 1, wherein any of isobutylene isoprene rubber (IIR), ethylene propylene terpolymer (EPT), or a mixture of isobutylene isoprene rubber (IIR) and ethylene propylene terpolymer (EPT) is used as the sealing rubber. Capacitor. The capacitor according to claim 1, wherein an electrolytic solution obtained by dissolving ethyltrimethylammonium tetrafluoroborate salt in γ-butyrolactone or propylene carbonate is used. A capacitor module integrated by connecting a plurality of capacitors according to claim 1 in parallel or in series. A capacitor module integrated by connecting a plurality of capacitor modules according to claim 8 in series or in parallel.

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