JP4600028B2 - 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. 8 is a cross-sectional view showing the structure of a conventional capacitor of this type, FIGS. 9A to 9D are perspective views of the front side and the inner side of the terminal board used in the capacitor. FIGS. 8 and 9 are a capacitor element, 10a is a capacitor element, 10a is a hollow portion formed in the capacitor element 10, and the capacitor element 10 is made of an aluminum foil. This capacitor element is formed by winding a pair of positive and negative electrodes, each having a polarizable electrode layer formed on a current collector, shifted in opposite directions with a separator interposed therebetween (all not shown). The anode and the cathode are respectively taken out from both end faces (vertical direction in FIG. 8) of 10.

  Reference numeral 11 denotes an aluminum bottomed cylindrical metal case that houses the capacitor element 10 together with a driving electrolyte solution (not shown), and 11a is integrally provided on the inner bottom surface so as to be fitted into the hollow portion 10a of the capacitor element 10. The cathode-side end face of the capacitor element 10 inserted into the metal case 11 with the protrusion 11a fitted in the hollow portion 10a is mechanically and electrically connected to the inner bottom surface of the metal case 11 by laser welding or the like. It is made to join.

  12 is an aluminum terminal board, 12a is an anode terminal for external connection integrally provided on the surface side of the terminal board 12, and 12b is a joint portion with the end face on the anode side of the capacitor element 10 provided on the inner surface side. , 12c are protrusions that fit into the hollow portion 10a of the capacitor element 10, 12d is a safety valve mounting hole that also serves as an electrolyte injection portion, and the end surface on the anode side of the capacitor element 10 is laser welded to the joint portion 12b. By joining by means, mechanically and electrically connected, the opening of the metal case 11 is wound around the periphery of the terminal plate 12 with an insulating sealing rubber 13 interposed therebetween. It is configured to be sealed by processing (generally called curling processing).

  The conventional capacitor configured in this way is configured to take out the anode from the anode terminal 12a for external connection provided on the terminal plate 12 and to take out the cathode from the metal case 11, and a plurality of these capacitors are connected. As a result, the capacitor unit is used for a vehicle backup power supply.

  FIG. 10 is a cross-sectional view showing another example of this type of conventional capacitor. This capacitor is integrally provided with a strip-like cathode terminal 14a for external connection on the bottom surface of a metal case 14 and externally connected. The outer periphery of the terminal plate 15 provided with the connecting anode terminal 15a on the surface side is extended, and the periphery of the terminal plate 15 and the opening of the metal case 14 are wound together with an insulating member (not shown) interposed therebetween. It is configured to be sealed by processing (generally referred to as double winding processing), and the other configuration is the same as the capacitor shown in FIG.

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

  However, the conventional capacitor has a problem that it is difficult to reduce the size because of the structure of the terminal plate 12 (the same applies to the terminal plate 15). That is, as shown in detail in FIG. 9D, the conventional terminal plate 12 is exposed on the outer surface, and the open end of the metal case 11 is drawn on the outer periphery via the sealing rubber 13. Since the sealing surface side is used as a reference surface, a plurality of joint portions 12b to which the anode side end surface of the capacitor element 10 is joined are provided radially so as to be recessed from the reference surface to the inner surface side. The dimension from the end face on the anode side to the upper end of the metal case 11 after curling is the same as the dimension from the reference plane to the joint 12b (corresponding to the depressed dimension), and the processed part of the sealing rubber 13 and the metal case 11 Thus, the ratio of the total size of the capacitor to the total height of the capacitor was a large one that could not be ignored.

  Therefore, in a situation where a small size and a large capacity are required, it is extremely difficult to increase the capacity and reduce the resistance because the height of the capacitor element 10 cannot be increased while the height of the capacitor is limited. It had the subject of being.

  An object of the present invention is to solve such a conventional problem and to provide a capacitor capable of achieving a small size, a large capacity, and a low resistance.

In order to solve the above-described problems, the present invention is a method of winding a pair of positive and negative electrodes, each having a polarizable electrode layer formed on a current collector made of a metal foil , with a separator interposed therebetween, and the positive and negative electrodes are opposite to each other. A capacitor element having a hollow portion configured to be positioned; a bottomed cylindrical metal case containing the capacitor element together with a driving electrolyte; and a terminal plate in which one electrode of the capacitor element is joined to an inner surface; In the capacitor made of sealing rubber fitted into the terminal plate and press-contacted by the open end of the metal case, the inner surface of the terminal plate to which one electrode of the capacitor element is joined is used as a reference surface. from the surface, the other portion leaving the joining portion of the plurality of strip toward the center was raised to the surface side of the terminal plate from the outer peripheral portion and the outer peripheral portion of the terminal plate, this ridge, the sealing It is obtained by the structure having the stepped portion of the rubber is fitted cyclic.

  As described above, the capacitor according to the present invention uses the terminal plate as the reference surface on the inner surface to which the electrode of the capacitor element is bonded, and the reference surface includes the outer peripheral portion and a plurality of strip-shaped bonding portions from the outer peripheral portion toward the center. By leaving the other parts raised on the surface side, the reference surface of the terminal plate becomes the junction with the capacitor element, so that the anode side end face of the capacitor element is connected to the upper end of the processed metal case. The size can be made extremely small, and as a result, the height of the capacitor element can be increased in a capacitor of the same height, so that the capacity can be increased and the resistance can be lowered at the same time. An effect is obtained.

(Embodiment 1)
Hereinafter, the first to sixth aspects of the present invention will be described with reference to the first embodiment.

  FIG. 1 is a cross-sectional view showing the configuration of a capacitor according to Embodiment 1 of the present invention, FIGS. 2A to 2D are front side perspective views showing the configuration of a terminal plate used in the capacitor, and the inner surface FIG. 1 is a perspective view of a side, AA cross-sectional view, and BB cross-sectional view. In FIGS. 1 and 2, reference numeral 1 denotes a capacitor element, and 1 a denotes a hollow portion formed in the capacitor element 1. Is formed by winding a pair of positive and negative electrodes in which a polarizable electrode layer is formed on a current collector made of aluminum foil, with the positions being reversed in the opposite directions and interposing a separator therebetween (all not shown). The anode and the cathode are respectively taken out from both end faces (vertical direction in FIG. 1) of the capacitor element 1.

  Reference numeral 2 denotes an aluminum bottomed cylindrical metal case that accommodates the capacitor element 1 together with a driving electrolyte (not shown), and 2a is integrally provided on the inner bottom surface so as to fit into the hollow portion 1a of the capacitor element 1. The end face on the cathode side of the capacitor element 1 inserted into the metal case 2 by fitting the protrusion 2a into the hollow portion 1a is mechanically and electrically connected to the inner bottom surface of the metal case 2 by laser welding or the like. It is made to join.

  Reference numeral 3 denotes an aluminum terminal plate which is bonded to the end face on the anode side of the capacitor element 1 and is disposed in the opening of the metal case 2 for sealing. The terminal plate 3 is an anode of the capacitor element 1. The inner surface to which the end face on the side is joined is used as a reference surface, and this reference surface is raised on the surface side, leaving the outer peripheral portion 3a and a plurality of strip-shaped joint portions 3b from the outer peripheral portion 3a to the center. The end face on the anode side of the capacitor element 1 is mechanically and electrically joined to the joint portion 3b by laser welding or the like.

  Further, a projection 3c that fits into the hollow portion 1a of the capacitor element 1 is provided in the center of the inner surface of the terminal plate 3, and an anode terminal for external connection having a female screw on the surface side of the terminal plate 3 3d is provided, and a step 3e for fitting a sealing rubber, which will be described later, is provided on the outer periphery on the front side, and a protrusion 3f is provided in an annular shape at the approximate center of the step 3e. Further, 3g is a rotation preventing portion provided on the surface side, 3h is a safety valve mounting hole that also serves as an electrolyte injection portion, and a recess into which a safety valve (not shown) mounted in the safety valve mounting hole 3h is fitted in a non-contact state. If the capacitor element 1 is provided on the end face on the anode side, the capacitor element 1 can be reduced in size without fear of a short circuit.

  Reference numeral 4 denotes an insulating member, and 5 denotes a sealing rubber. A protrusion 3c provided on the inner surface of the terminal plate 3 is fitted into the hollow portion 1a of the capacitor element 1, and an end face on the anode side of the capacitor element 1 is attached to the joint portion 3b. The terminal plate 3 is mechanically and electrically joined by laser welding or the like, and the terminal plate 3 is disposed in the opening of the metal case 1 with the insulating member 4 interposed therebetween. In the arranged state, the open end of the metal case 1 is subjected to curling so as to press-contact the sealing rubber 5 so that the capacitor according to the present embodiment is configured.

  In the capacitor according to the present embodiment configured as described above, since the reference surface of the terminal plate 3 is a joint portion with the end surface on the anode side of the capacitor element 1, the capacitor element 1 is processed from the end surface on the anode side. Since the dimension up to the upper end of the metal case 2 can be made extremely small and, as a result, the height of the capacitor element can be increased in a capacitor having the same height, the capacity is increased and the capacitance is reduced. A special effect that resistance can be achieved can be obtained.

  This effect will be described in more detail. FIG. 3 shows a comparison between the capacitor according to the present embodiment and the conventional capacitor described in the background art (FIG. 8). In FIG. Due to the effect of the plate 3, the dimension from the anode side end face of the capacitor element 1 to the upper end of the metal case 2 after processing is as small as H1, whereas the same dimension of the conventional product is as large as H2, and this dimensional difference is shown in FIG. As shown, H2−H1 = H3.

  Therefore, when the overall height of the capacitor is the same, the size of the capacitor element 1 can be increased by the size difference H3, so that the capacity is increased and the resistance is reduced at the same time. This characteristic improvement effect is shown in (Table 1) together with the characteristics of the capacitor according to the second embodiment to be described later.

  As is clear from Table 1, the capacitor according to the present embodiment has a capacity increased by 25% when compared with the ratio of the capacitor according to the second embodiment to be described later and the resistance when the resistance is 100. It can be seen that the resistance is reduced by 20%, and a great improvement effect is obtained.

  In the present embodiment, the anti-rotation portion 3g provided on the surface side of the terminal plate 3 prevents the terminal plate 3 from rotating when a male screw (not shown) is fastened to the female screw provided on the anode terminal 3d for external connection. However, the present invention is not limited to this, and may be formed in a concave shape.

  In the present embodiment, the external connection anode terminal 3d provided on the surface side of the terminal plate 3 has been described as a convex configuration having a female screw, but the present invention is not limited to this. Any shape can be used.

  Capacitor element 1 according to the present embodiment is wound with a pair of positive and negative electrodes, each having a polarizable electrode layer formed on a current collector made of aluminum foil, shifted in the opposite directions with a separator interposed therebetween. However, the present invention is not limited to this, and the polarizable electrode layer constituting the electrode is provided on one end side of the current collector with the exposed portion of the current collector. A pair of positive and negative electrodes formed with this polarizable electrode layer was formed by winding with the separator interposed between the exposed portions of the current collector in opposite directions. The polarizable electrode layer constituting the capacitor element or electrode is formed on the entire surface of the current collector so that no exposed portion of the current collector remains, and the pair of positive and negative electrodes on which the polarizable electrode layer is formed are opposite to each other. No position in the direction Those ends of the respective may be configured by using a capacitor element configured by winding in a separator is interposed to therebetween so as to project in opposite directions and.

  Further, in the present embodiment, the anode of the capacitor element 1 is taken out from the terminal plate 3 and the cathode is taken out from the metal case 2, but the present invention is not limited to this, and the reverse polarity is taken. It may be taken out.

(Embodiment 2)
The second aspect of the present invention will be described below with reference to the seventh aspect of the present invention.

  In this embodiment, the structure of the capacitor terminal plate and the metal case according to the first embodiment is changed so that the external extraction structure of the anode / cathode is different. Other configurations are the same as those of the first embodiment. For the same reason, the same parts are denoted by the same reference numerals and detailed description thereof is omitted, and only different parts will be described in detail below with reference to the drawings.

  4 is a cross-sectional view showing the structure of the capacitor according to the second embodiment of the present invention, FIG. 5 is a cross-sectional view showing the structure of the terminal plate used in the capacitor, and in FIGS. An aluminum bottomed cylindrical metal case 6a containing the capacitor element 1 together with a driving electrolyte (not shown) is a strip-like cathode terminal for external connection integrally provided on the outer bottom surface of the metal case 6. is there.

  Reference numeral 7 denotes an aluminum terminal plate which is bonded to the end face on the anode side of the capacitor element 1 and disposed in the opening of the metal case 6 for sealing. The inner surface to which the end surface on the anode side is joined is used as a reference surface, and this reference surface is raised on the surface side while leaving the outer peripheral portion 7a and a plurality of strip-shaped joint portions 7b from the outer peripheral portion 7a to the center. The end face on the anode side of the capacitor element 1 is mechanically and electrically joined to the joint portion 7b by laser welding or the like. The projection 7c that fits into the hollow portion 1a of the element 1 is provided as in the first embodiment.

  Further, a strip plate-like anode terminal 7d for external connection is provided on the surface side of the terminal plate 7, and an annular rising portion 7e rising from the outer periphery to the surface side of the terminal plate 7, and the rising portion 7e A tightening portion 7f extending in a bowl shape from the upper end in the outer diameter direction is integrally provided, and a protrusion 7c provided on the inner surface of the terminal plate 7 is fitted into the hollow portion 1a of the capacitor element 1 to be connected to the joint portion 7b. 1, the end face on the anode side is mechanically and electrically joined by laser welding or the like, and the terminal plate 7 is disposed in the opening of the metal case 6, and the tightening portion 7 f provided on the terminal plate 7. The capacitor according to the present embodiment is configured by sealing the peripheral edge of the metal and the opening of the metal case 6 by double winding so as to be wound together with an insulating member (not shown) interposed therebetween. Is shall.

  In the capacitor according to the present embodiment configured as described above, the dimension from the end surface on the anode side of the capacitor element 1 to the upper end of the metal case 6 after processing can be made extremely small, like the capacitor according to the first embodiment. As a result, since the height of the capacitor element can be increased in a capacitor of the same height, the capacity can be increased and the resistance can be reduced. An effect is obtained.

  FIG. 6 shows a comparison between the capacitor according to the present embodiment and the conventional capacitor described in the background art (FIG. 10) in order to explain the effect of the present embodiment in more detail. In the invention product, the dimension from the end face on the anode side of the capacitor element 1 to the upper end of the processed metal case 6 is as small as H1 due to the effect of the terminal plate 7, whereas the same dimension of the conventional product is as large as H2. The dimensional difference is H2−H1 = H3 as shown in FIG.

  Therefore, when the overall height of the capacitor is the same, the size of the capacitor element 1 can be increased by the size difference H3, so that the capacity is increased and the resistance is reduced at the same time. This characteristic improvement effect is shown in (Table 1) together with the capacitor according to the first embodiment.

  As is clear from Table 1, the capacitor according to the present embodiment is greatly improved by comparing the ratio of the conventional product with the resistance of 100 when the capacity is 100% and the resistance is reduced by 9%. It is understood that an effect can be obtained.

(Embodiment 3)
Hereinafter, the invention according to the eighth aspect of the present invention will be described with reference to the third embodiment.

  In the present embodiment, the configuration of the anode terminal provided on the terminal plate of the capacitor according to the first embodiment is partially different, and the other configurations are the same as those of the first embodiment, and thus the same. The same reference numerals are given to the portions, and detailed description thereof is omitted, and only different portions will be described in detail below with reference to the drawings.

  7A and 7B are a cross-sectional view showing a state in which a plurality of capacitors according to Embodiment 3 of the present invention are connected, and an enlarged cross-sectional view of the same part. In FIG. 8b is a joint, 8c is a projection, 8d is an anode terminal for external connection, 8e is a caulking portion provided by making a part of the tip of the anode terminal 8d thin, and 9 is a connection bar. is there.

  When a plurality of capacitors according to the present embodiment configured as described above are used in a connected manner, as shown in detail in FIG. 7B, the caulking provided on the anode terminal 8d of the terminal plate 8 is used. After connecting the connecting bar 9 to the portion 8e and connecting the caulking portion 8e by caulking, the vicinity of the caulking portion 8e is laser-welded to perform a more reliable connection, As compared with the anode terminal 3d having the female screw shown in the first embodiment, a special effect that the height can be further reduced can be obtained.

  In the capacitor according to the present invention, since the dimension from the end surface on the anode side of the capacitor element to the upper end of the metal case after processing can be made extremely small, the height of the capacitor element can be increased in the same height capacitor. Thus, the capacitor can be increased in capacity and reduced in resistance at the same time, and is useful as a capacitor in a field where a small size and a large capacity are required.

Sectional drawing which showed the structure of the capacitor | condenser by Embodiment 1 of this invention (A) Perspective view of the surface side showing the configuration of the terminal board used for the capacitor, (b) Perspective view of the inner surface side, (c) Cross section taken along the line AA, (d) Cross section taken along the line BB Figure Cross-sectional view comparing the same capacitor with a conventional capacitor Sectional drawing which showed the structure of the capacitor | condenser by Embodiment 2 of this invention Sectional view showing the structure of the terminal board used in the capacitor Cross-sectional view comparing the same capacitor with a conventional capacitor (A) Cross-sectional view of a state in which a plurality of capacitors according to Embodiment 3 of the present invention are connected, (b) Cross-sectional view in which the main part is enlarged. Sectional view showing the structure of a conventional capacitor (A) Perspective view of the surface side showing the configuration of the terminal board used for the capacitor, (b) Perspective view of the inner surface side, (c) Cross section taken along the line AA, (d) Cross section taken along the line BB Figure Sectional view showing another example of conventional capacitor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Capacitor element 1a Hollow part 2, 6 Metal case 2a, 3c, 3f, 7c, 8c Protrusion 3, 7, 8 Terminal board 3a, 7a Peripheral part 3b, 7b, 8b Joint part 3d, 7d, 8d Anode terminal 3e Step part 3g Non-rotating part 3h Safety valve mounting hole 4 Insulating member 5 Sealing rubber 6a Cathode terminal 7e Rising part 7f Tightening part 8e Caulking part 9 Connection bar

Claims (9)

A pair of positive and negative electrodes in which a polarizable electrode layer is formed on a current collector made of metal foil is wound with a separator interposed therebetween, and has a hollow portion configured so that the positive and negative electrodes are positioned in opposite directions. a capacitor element, a bottomed cylindrical metal case containing the capacitor element together with driving electrolyte, one a terminal plate electrodes bonded to the inner surface of the capacitor element, the metal case is fitted to the terminal plate In a capacitor made of sealing rubber pressed against the open end of
An inner surface one electrode of the upper Symbol capacitor element of the terminal plate is bonded to a reference plane, than the reference surface, leaving a joint portion of a plurality of strip-shaped toward the center from the outer peripheral portion and the outer peripheral portion of the terminal plate the inner surface of the other portion is raised on the front surface side of the terminal plate, co uplift this has constituted a stepped portion of the annular rubber the sealing is fitted capacitor. The capacitor according to claim 1, wherein a terminal portion for external connection provided at the center of the surface of the terminal plate is constituted by a female screw. The capacitor according to claim 1 , wherein a protrusion is provided in an annular shape at substantially the center of an annular step provided on the outer periphery of the surface of the terminal plate. The capacitor according to claim 1, wherein a detent portion including a concave portion and / or a convex portion is provided on a surface of the terminal plate. The terminal plate is provided with a safety valve mounting hole that also serves as a driving electrolyte injection portion, and a recess into which the safety valve mounted in the safety valve mounting hole is fitted in a non-contact state is provided in the electrode of the capacitor element. Capacitor. The capacitor according to claim 1, wherein a crimp joint portion is provided with a tip of the terminal portion of the external connection portion provided at the center of the surface side of the terminal plate having a small diameter. 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 a pair of positive and negative electrodes on which the polarizable electrode layer is formed are exposed to the current collector. 2. The capacitor according to claim 1, wherein the capacitor element is formed by winding with a separator interposed therebetween so that the portions are in opposite directions. The polarizable electrode layer constituting the electrode is formed on the entire surface of the current collector so that no exposed portion of the current collector remains, and the pair of positive and negative electrodes on which the polarizable electrode layer is formed are positioned in opposite directions. 2. The capacitor according to claim 1, wherein the capacitor element is formed by shifting and winding each end portion protruding in opposite directions with a separator interposed therebetween. A pair of positive and negative electrodes in which a polarizable electrode layer is formed on a current collector made of metal foil is wound with a separator interposed therebetween, and has a hollow portion configured so that the positive and negative electrodes are positioned in opposite directions. A capacitor element, a bottomed cylindrical metal case containing the capacitor element together with a driving electrolyte, and a terminal plate in which one electrode of the capacitor element is joined to the inner surface to seal the opening of the metal case In the capacitor, the terminal plate has an inner surface to which one electrode of the capacitor element is bonded as a reference surface, and the reference surface is left with an outer peripheral portion and a plurality of band-shaped bonding portions from the outer peripheral portion toward the center. This part is raised on the surface side, and an annular rising part that rises from the outer periphery to the surface side of the terminal board, and a winding that extends like a bowl from the upper end of the rising part in the outer diameter direction. The order processing unit is provided integrally, capacitor the tightening processed portion sealed by involving an opening of the metal case.

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