JP4982949B2 - Capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easy-to-connect capacitor in which connection space and unnecessary resistance can be reduced by solving a matter that reduction in size is difficult because the positive electrode terminal and the negative electrode terminal are led out to the opposite sides when a plurality of capacitors are coupled and the connection space is increased. <P>SOLUTION: Since one set of two capacitors each comprising a metal case 3 containing a capacitor element 2 while bonding one electrode thereof to the inner bottom face, and a terminal board 4 sealing the opening of the metal case 3 by bonding the other electrode of the capacitor element 2 to the inner surface are bonded through a connection board 7 while differentiating the polarity from each other, low resistance is realized. Furthermore, since the positive electrode and the negative electrode can be taken out from a terminal 4a provided on the terminal board 4 and the metal case 3, connection space between capacitors can be reduced when a capacitor unit is constituted by coupling a plurality of capacitors resulting in reduction in size. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

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. 4 is a cross-sectional view showing the structure of this type of conventional capacitor. In FIG. 4, reference numeral 10 denotes a capacitor element. This capacitor element 10 has a polarizable electrode layer formed on a current collector made of aluminum foil. A pair of positive and negative electrodes are wound in positions opposite to each other with a separator interposed therebetween (all not shown), and anodes are formed from both end faces (vertical direction in FIG. 4) of the capacitor element 10. And the cathode are taken out respectively.

  11 is a metal case made of aluminum containing the capacitor element 10 together with a driving electrolyte solution (not shown), 11a is a cathode terminal for external connection integrally provided on the bottom surface of the metal case 11, and the cathode of the capacitor element 10 The end surface on the side is mechanically and electrically connected by joining the inner bottom surface of the metal case 11 by means such as laser welding.

  12 is an aluminum lid, 12a is an anode terminal for external connection provided integrally with the lid 12, and the anode side end surface of the capacitor element 10 is joined to the inner surface of the lid 12 by means such as laser welding. Thus, the peripheral edge of the lid 12 and the opening of the metal case 11 (portion indicated by reference numeral 13 in FIG. 4) are wound together with an insulating member (not shown) interposed therebetween. Thus, it is configured to be sealed by processing (generally called curling processing).

  The conventional capacitor thus configured has a configuration in which an anode terminal 12a and a cathode terminal 11a for external connection are provided in the central axis direction (vertical direction in FIG. 4) of the metal case 11, and this anode terminal 12a and cathode The terminal 11a is used as an on-vehicle backup power source as a capacitor unit by connecting and connecting a plurality of capacitors using a connecting member 14 called a bus bar (shown in FIG. 11 described later). .

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 conventional capacitor, when a plurality of capacitors are connected and used as a capacitor unit as shown in FIG. 5, when the anode terminal 12a and the cathode terminal 11a are connected, the terminals are pulled out in opposite directions. Therefore, not only is the connection work difficult, but connection spaces h1 and h2 are required at both ends, resulting in a problem that a large mounting space is required and the device cannot be downsized.

  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 perform electrode extraction from a plurality of locations, there is a problem that the resistance increases as compared with a configuration called end surface current collection in which the entire end surface of the capacitor element 10 is extracted. When used as a unit, there was a problem that it could not 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, reduces the connection space, and provides an unnecessary resistance as a capacitor. It is an object to provide a capacitor that can be extremely reduced.

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. Capacitor element configured to be positioned, and a cylindrical metal case with a bottom which accommodates the capacitor element together with a driving electrolyte and has one of the electrodes of the capacitor element positioned in opposite directions joined to the inner bottom surface And a terminal plate that is provided in the opening of the metal case and is electrically connected to the other electrode of the capacitor element, and is press-contacted via a sealing rubber by a curling portion provided on an open end of the metal case. A capacitor in which one electrode of the capacitor element is taken out from the metal case, and a set of two capacitors each having a polarity different from each other is connected to the connection plate. Electrically and mechanically joined by laser welding, and coated as the outer circumference of the vertical ends of the metal case the outer periphery of the two capacitors in integral heat-shrinkable resin film is exposed, the heat One end of the shrinkable resin film is positioned so that the curling portion is exposed , and the laser-welded connecting plate is in the direction in which the two capacitors covered with the heat-shrinkable resin film face each other. The structure has a welding mark formed in the vertical direction .

  As described above, the capacitor according to the present invention can be taken out directly from the end face of the element without using a lead member or the like for taking out the anode / cathode from the capacitor element. Since the cathode can be taken out from the terminal and the metal case provided on the terminal plate, when connecting a plurality of capacitors to form a capacitor unit, the connection space between each capacitor should be halved. Thus, an effect of facilitating downsizing can be obtained.

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

  FIGS. 1A and 1B are a front sectional view and a bottom view showing the configuration of a capacitor according to Embodiment 1 of the present invention, in which 1A and 1B indicate capacitors, and these capacitors 1A and 1B are Although the details will be described later, the positive and negative polarities are different from each other. First, the capacitor 1A will be described.

  In the capacitor 1A, 2 indicates a capacitor element, 2a indicates a hollow portion formed in the capacitor element 2, and the capacitor element 2 includes a pair of positive and negative electrodes in which a polarizable electrode layer is formed on a current collector made of aluminum foil. The positions are shifted in opposite directions and wound with a separator interposed therebetween (all not shown), and the anode and cathode are respectively taken out from both end faces (vertical direction in the figure) of the capacitor element 2. It is what I did.

  3 is a bottomed cylindrical metal case made of aluminum containing the capacitor element 2 together with a driving electrolyte (not shown), and 3a is integrally provided on the inner bottom surface so as to be fitted into the hollow portion 2a of the capacitor element 2. The protrusion 3a is fitted into the hollow portion 2a of the capacitor element 2 and the end surface on the cathode side of the capacitor element 2 inserted into the metal case 3 is mechanically bonded to the inner bottom surface of the metal case 3 by laser welding or the like. In addition, they are electrically connected.

  Reference numeral 4 denotes an aluminum terminal plate which is bonded to the end face on the anode side of the capacitor element 2 and is disposed in the opening of the metal case 3 for sealing. The surface of the terminal plate 4 (upper side in the figure) ) Is provided with a terminal 4a for external connection, and on the back surface (lower side in the figure), a protrusion 4b that fits into the hollow portion 2a of the capacitor element 2 is integrally provided. The plate 4 is disposed in the opening of the metal case 3 with the insulating member 5 interposed therebetween, and the sealing rubber 6 is pressed against the surface of the terminal plate 4 with the sealing rubber 6 disposed on the periphery of the surface. The open end of the metal case 3 is sealed by curling.

  Therefore, the capacitor 1 </ b> A configured as described above is configured such that the anode of the capacitor element 2 is taken out from the terminal 4 a provided on the terminal plate 4 and the cathode is taken out from the metal case 3. On the other hand, the capacitor 1B is configured to have a polarity opposite to that of the capacitor 1A, and the anode of the capacitor element 2 is taken out from the metal case 3 and the cathode is taken out from the terminal 4a provided on the terminal plate 4. It is composed of.

  7 is an aluminum connection plate, which is joined by laser welding across the outer bottom surface of the metal case 3 of the capacitor 1A and the outer bottom surface of the metal case 3 of the capacitor 1B, thereby mechanically connecting the two capacitors. In addition, the two capacitors are electrically connected and connected to each other so that two capacitors are connected in series.

  Further, the connection plate 7 is formed in a substantially hexagonal shape, and the area where the connection plate 7 contacts the outer bottom surface of the metal case 3 is less than 50% of the area of the outer bottom surface of the metal case 3. In this way, sufficient swelling strength is ensured, and even if a phenomenon occurs in which the pressure in the metal case 3 rises and the bottom surface of the metal case 3 swells at the time of abnormality, this swelling phenomenon occurs. It will be possible to minimize the effects of hindering. Further, by forming the connection plate 7 in a substantially hexagonal shape, the connection plate 7 can be taken in a zigzag manner at the time of material acquisition, so that material loss can be extremely reduced.

  Reference numeral 7a denotes a welding mark obtained by joining the connecting plate 7 and the metal case 3 by laser welding. The welding mark 7a is formed by a straight line. After the metal case 3 expands, the influence of distortion on the contraction when returning to room temperature can be minimized. 1 (b) is a joining rib provided to join one end face of the capacitor element 2 to the inner bottom face of the metal case 3 by laser welding.

  In addition, since the thickness of the said connection board 7 should be thin within the range which can flow the allowable electric current value of capacitor | condenser 1A, 1B without a problem, and can guarantee a connection board intensity | strength and welding strength, it is 0.1-0.1. A range of 0.8 mm is preferable, and a range of 0.2 to 0.5 mm is more preferable.

  The capacitor according to the present embodiment configured as described above has a low resistance because the anode / cathode is taken out from the capacitor element 2 directly from the end face of the capacitor element 2 without using a lead member or the like. In addition, since it is possible to take out the anode / cathode from the terminal 4a provided on the terminal plate 4 and the metal case 3, when configuring a capacitor unit by connecting a plurality of capacitors, The connection space between the capacitors can be halved, and a special effect of facilitating downsizing can be obtained.

(Embodiment 2)
Hereinafter, the invention according to claim 5 of the present invention will be described using the second embodiment.

  In the present embodiment, the configuration of the connection plate of the capacitor described in the first embodiment is different, and other configurations are the same as those 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. 2 is a plan view showing a configuration of a connection plate used in the capacitor according to the second embodiment of the present invention. In FIG. 2, reference numeral 8 denotes a connection plate, and this connection plate 8 has a boundary between central capacitors. The notch 8a is provided from both ends, leaving the central part in the part to be a part, and the straight part 8b is provided at the tip of the notch 8a.

  By using the connection plate 8 configured in this way, in addition to the effect obtained by the capacitor according to the first embodiment, both the parallelism and height of the outer bottom surfaces of the metal case 3 of the capacitor 1A and the capacitor 1B are both Even when subtle variations occur in the meantime, these can be absorbed by the notches 8a, and more accurate coupling can be performed.

  Further, when the variation is absorbed by the notch 8a in this way, the straight portion 8b is provided at the tip of the notch 8a, thereby avoiding stress concentration and obtaining a more reliable capacitor.

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

  In the present embodiment, the capacitor described in the first embodiment is subjected to exterior treatment. Since the other configurations are the same as those in the first embodiment, the same reference numerals are given to the same portions. The detailed description will be omitted, and only different parts will be described below with reference to the drawings.

  FIG. 3 is a front sectional view showing the structure of the capacitor according to Embodiment 3 of the present invention. In FIG. 3, 9 is a heat-shrinkable resin film, and this heat-shrinkable resin film 9 includes two capacitors 1A, By mounting so as to cover the outer periphery of 1B, the connected state of the two capacitors 1A and 1B can be further stabilized.

  The capacitor according to the present invention has an effect that, when a capacitor unit in which a plurality of capacitors are connected is configured, the connection space between the capacitors can be halved and the size can be easily reduced. It is useful as a capacitor used for car or fuel cell car regeneration or for power storage.

(A) Front sectional view showing the configuration of the capacitor according to the first embodiment of the present invention, (b) The bottom view The top view which showed the structure of the connection board used for the capacitor | condenser by Embodiment 2 of this invention Front sectional view showing the structure of the capacitor according to Embodiment 3 of the present invention 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 1A, 1B Capacitor 2 Capacitor element 2a Hollow part 3 Metal case 3a, 4b Protrusion 3b Depression 4 Terminal board 4a Terminal 5 Insulation member 6 Sealing rubber 7, 8 Connection board 7a Welding mark 8a Notch 8b Linear part 9 Heat shrinkability Resin film

Claims (1)

A capacitor element configured such that 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 the positive and negative electrodes are positioned in opposite directions; A cylindrical metal case with a bottom that accommodates the capacitor element together with the driving electrolyte and electrically connects one of the electrodes located in opposite directions of the capacitor element, and an opening of the metal case. The terminal of the capacitor element is electrically connected to the open end of the metal case and pressed by a curling portion provided on the open end of the metal case through a sealing rubber, and the capacitors have different polarities. two pair constituted, electrical and mechanically joined by laser welding through the connection plate, before the outer periphery of the two capacitors in integral heat-shrinkable resin film Was coated as an outer periphery of the upper and lower opposite ends of the metal case is exposed, the one end side of the heat-shrinkable resin film is located such that the curling processing section is exposed, the connecting plate that is laser welded A capacitor having welding marks formed in a direction perpendicular to the opposing direction of the two capacitors covered by the heat-shrinkable resin film .

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