JP4613732B2 - Capacitor - Google Patents

Description

  The present invention relates to a capacitor used for regeneration of various electronic devices and hybrid vehicles, or for power storage.

  FIG. 5 is a cross-sectional view showing the configuration of this type of conventional capacitor, FIG. 6 is a cross-sectional view showing the configuration of a pressure regulating valve provided in the capacitor, and in FIGS. 5 and 6, 20 is a capacitor element. , 20a indicates a hollow portion formed in the capacitor element 20, and the capacitor element 20 has a pair of positive and negative electrodes in which a polarizable electrode layer is formed on a current collector made of an aluminum foil and is shifted in the opposite direction to each other. The separator is interposed between them and wound (all not shown), and the anode and the cathode are respectively taken out from both end faces (vertical direction in FIG. 5) of the capacitor element 20. .

  21 is a bottomed cylindrical metal case made of aluminum containing the capacitor element 20 together with a driving electrolyte (not shown), 21a is an external connection cathode terminal integrally provided on the outer bottom surface of the metal case 21, and 21b. Is a protrusion integrally provided on the inner bottom surface so as to be fitted into the hollow portion 20a of the capacitor element 20, and this protrusion 21b is fitted into the hollow portion 20a of the capacitor element 20 and inserted into the metal case 21. The end face on the cathode side of the capacitor element 20 is mechanically and electrically joined to the inner bottom face of the metal case 21 by laser welding or the like.

  22 is a sealing plate made of aluminum, 22a is an anode terminal for external connection integrally provided on the surface side of the sealing plate 22, 22b is a protrusion that fits into the hollow portion 20a of the capacitor element 20, and 22c is an electrolytic solution. The injection hole 23 is a pressure adjusting valve. The anode end face of the capacitor element 20 is joined to the inner surface of the sealing plate 22 by means of laser welding or the like, so that it is mechanically and electrically connected. It is configured to be sealed by processing (generally referred to as curling processing) so as to enclose the opening of the metal case 21 on the periphery of 22.

  Further, as shown in detail in FIG. 6, the pressure regulating valve 23 is a metal having a gas permeable member 24 and a closing body 25 disposed on the electrolyte solution injection hole 22c and having a hole 26a communicating with the outside. The metal cap 26 is fixed so as to be covered with the cap 26 and urged in a direction to always close the closing body 25. The metal cap 26 is fixed in advance so as to surround the periphery of the electrolyte injection hole 22c with the sealing plate 22. The annular convex portion 22d provided as described above is fixed by being deformed by caulking or the like and pressed against the metal cap 26.

  The pressure regulating valve 23 is a self-recovering type for releasing the pressure to the outside when the internal pressure of the capacitor becomes a predetermined pressure or more. The gas generated inside the capacitor is discharged to the outside to discharge the gas inside the capacitor. Since the pressure can be prevented from rising and the pressure regulating valve 23 can return to the state before the operation and keep the airtightness inside the capacitor after the operation, the capacitor can be increased even when the pressure is increased due to gas generation inside the capacitor. The appearance is not abnormal, and the characteristics can be maintained.

  Further, the pressure regulating valve 23 is provided with a gas permeable member 24 made of a material that prevents the driving electrolyte from passing therethrough and transmits gas generated inside the capacitor to the outside. Thus, the electrolytic solution does not adhere to the closing body 25 and the function of the pressure regulating valve 23 is not impaired, and the leakage of the driving electrolytic solution to the outside of the capacitor can be prevented through the pressure regulating valve 23.

  The conventional capacitor configured as described above can reduce the places where the driving electrolyte solution may leak by disposing and fixing the pressure regulating valve 23 in the electrolyte solution injection hole 22c. It was that a highly reliable capacitor could be obtained.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2004-134632 A

  However, in the conventional capacitor described above, the leakage of the driving electrolyte is reduced by disposing and fixing the pressure regulating valve 23 in the electrolyte injection hole 22c, but the gas permeable member 24 and the sealing plate 22 is not joined, there is a problem that the driving electrolyte is likely to leak from this interface. To solve this problem, the gas permeable member 24 and the sealing plate 22 are joined by adhesion or welding. However, there is a problem that joining is extremely difficult due to the physical properties of both materials.

  An object of the present invention is to solve such a conventional problem and to provide a capacitor capable of exhibiting excellent reliability by eliminating leakage of a driving electrolyte.

  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 configured to be positioned, a capacitor case containing the capacitor element together with a driving electrolyte, and a bottomed cylindrical metal case in which one electrode of the capacitor element is joined to the inner bottom surface; and the capacitor element In the capacitor comprising a terminal plate joined to the inner surface of the other electrode and sealing the opening of the metal case, and provided with a pressure regulating valve also serving as a hole for injecting the driving electrolyte in the terminal plate, The regulating valve is formed in a bottomed cylindrical shape in which the engaging portion that fits into the hole provided in the terminal plate is provided on the peripheral surface on the opening side, and the inside and the outside communicate with the peripheral surface on the bottom surface side. A rubber elastic member provided with a hole; A ring-shaped gas permeable sheet in close contact with the peripheral surface on the bottom surface side of the elastic member so as to close the hole provided in the elastic member, and a ring-shaped rubber made in close contact with the outer surface of the gas permeable sheet It consists of a valve body.

  As described above, in the capacitor according to the present invention, the gas permeable sheet is joined so as to close the hole provided in the peripheral surface of the bottomed cylindrical valve body, and the valve body is in close contact with the hole of the terminal plate. According to the configuration, it is possible to obtain an effect that a capacitor having excellent reliability can be realized without leakage of the driving electrolyte.

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

  1 is a cross-sectional view showing the configuration of a capacitor according to Embodiment 1 of the present invention, FIG. 2 is a top perspective view showing the configuration of a terminal plate used in the capacitor, and FIGS. It is the exploded sectional view showing the composition of the pressure regulation valve used for the capacitor, the assembly sectional view before wearing, and the assembly sectional view after wearing.

  1 to 3, reference numeral 1 denotes a capacitor element, 1a denotes a hollow portion formed in the capacitor element 1, and the capacitor element 1 is a pair of positive and negative electrodes in which a polarizable electrode layer is formed on a current collector made of an aluminum foil. The electrodes of the capacitor element 1 are shifted in opposite directions and wound with a separator interposed therebetween (all not shown), and the anode and cathode are formed from both end faces (vertical direction in FIG. 1) of the capacitor element 1. Are configured to take out each of them.

  Reference numeral 2 denotes an aluminum bottomed cylindrical metal case containing the capacitor element 1 together with a driving electrolyte (not shown). Reference numeral 2a denotes a protrusion integrally provided on the inner bottom surface of the metal case 2. The capacitor element 1 is fitted into the hollow portion 1 a of the capacitor element 1, and the cathode side end surface of the capacitor element 1 inserted into the metal case 2 is mechanically and electrically connected to the inner bottom surface of the metal case 2 by means of laser welding or the like. The electrode on the cathode side of the capacitor element 1 is taken out from the metal case 2 by bonding to the metal case 2.

  3 is an aluminum terminal plate, 3a is a protrusion integrally provided on the inner surface of the terminal plate 3, 3b is a joint provided on the same inner surface, and 3c is an anode terminal for external connection provided integrally on the surface. 3d is a hole for electrolyte injection, and the protrusion 3a is fitted into the hollow portion 1a of the capacitor element 1, and the end surface on the anode side of the capacitor element 1 is mechanically bonded to the joint portion 3b by means such as laser welding. And sealing the metal plate 2 by processing it so that the opening of the metal case 2 is wound on the periphery of the terminal plate 3 with the insulating member 4 interposed therebetween (generally called curling). It is configured to stop.

  In the capacitor according to the present embodiment configured as described above, a predetermined amount of driving electrolyte is injected into the metal case 2 through the electrolyte injection hole 3d provided in the terminal plate 3, and then the electrolyte The pressure adjusting valve is configured to be mounted using the injection hole 3d, and this specific embodiment will be described with reference to FIG.

  In FIG. 3, 5 is a terminal plate, and 5 a is a hole for electrolyte injection provided in the terminal plate 5. 6 is a bottomed cylindrical elastic member made of a material having elasticity such as rubber, 6a is an engaging portion provided on the peripheral surface of the elastic member 6 so as to be fitted into the hole 5a provided in the terminal plate 5, Reference numeral 6b denotes a hole provided on the peripheral surface on the bottom surface side so as to communicate the inside and the outside of the elastic member 6, and in this embodiment, the material of the elastic member 6 is ethylene propylene terpolymer (hereinafter referred to as EPT). Is used. Reference numeral 7 denotes a ring-shaped gas permeable sheet joined so as to close the hole 6a provided on the peripheral surface on the bottom surface side of the elastic member 6, and this gas permeable sheet 7 is permeable to gas generated inside the capacitor. However, the driving electrolyte has physical properties that do not allow permeation.

  8 is a ring-shaped valve body made of an elastic material such as rubber, and is in close contact with the outer surface of the gas permeable sheet 7. In the present embodiment, isoprene isobutylene rubber ( Hereinafter, it is referred to as IIR), but EPT may be used.

  The pressure regulating valve according to the present embodiment configured as described above has a ring-shaped gas permeable sheet 7 so as to close a hole provided in a peripheral surface on the bottom surface side of the elastic member 6 formed in a bottomed cylindrical shape. Are bonded by means such as adhesion, and in a state where the ring-shaped valve body 8 is in close contact with the outer surface of the gas permeable sheet 7, these are press-fitted into the holes 5a provided in the terminal plate 5, and the elastic member 6 By fitting the engaging portion 6a into the hole 5a of the terminal plate 5, the valve body 8 is held in a compressed state, and the pressure adjusting valve is mounted as shown in FIG. 3 (c).

  In the pressure regulating valve according to the present embodiment configured as described above, since the elastic member 6 and the gas permeable sheet 7 are joined, the gas generated inside the capacitor permeates the gas permeable sheet 7 and the valve body. In addition, since the driving electrolyte does not permeate the gas permeable sheet 7, the elastic member 6 prevents leakage of the electrolyte for driving and exhibits excellent reliability. It will be able to be.

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

  In the present embodiment, the configuration of the pressure regulating valve of the capacitor described in the first embodiment is partially different, and other configurations are the same as those in the first embodiment. The same reference numerals are given to them, and detailed description thereof is omitted, and only different portions will be described below with reference to the drawings.

  4 (a) to 4 (c) are an exploded sectional view showing a configuration of a pressure regulating valve used in the capacitor according to the second embodiment of the present invention, an assembled sectional view before mounting, and an assembled sectional view after mounting. 4, 9 is a bottomed cylindrical metal member, and 9 a is a hole that communicates the inside and the outside of the metal member 9 provided on the peripheral surface of the bottom surface side of the metal member 9. Reference numeral 7 denotes a ring-shaped gas-permeable sheet joined so as to close a hole 9 a provided on the peripheral surface on the bottom surface side of the metal member 9.

  Reference numeral 10 is made of a material having elasticity such as rubber, and a ring-shaped valve body 10a in close contact with the outer surface of the metal member 9 including the gas permeable sheet 7 is formed on a part of the peripheral surface of the valve body 10. The provided flange portion 10b is a locking portion that comes into contact with the opening end of the metal member 9, and in this embodiment, isoprene-isobutylene rubber (hereinafter referred to as IIR) is used as the material of the valve body 10. However, EPT may be used.

  The pressure regulating valve according to the present embodiment configured as described above has a ring-shaped gas permeable sheet 7 so as to close the hole 9a provided on the bottom surface of the metal member 9 formed in a bottomed cylindrical shape. The cylindrical valve body 10 is brought into close contact with the outer surface of the metal member 9 including the gas permeable sheet 7 and is press-fitted into the hole 5a provided in the terminal plate 5 to be fitted into the valve body. 10 is held in a compressed state, and a pressure regulating valve is mounted as shown in FIG. 4 (c).

  The pressure regulating valve according to the present embodiment configured as described above is configured such that the valve body 10 is sandwiched between the rigid terminal plate 5 and the metal member 9, thereby further stabilizing the operating pressure of the valve body 10. It is possible to obtain the effect of being able to do so.

  The capacitor according to the present invention has an effect of eliminating the leakage of the driving electrolyte and is excellent in reliability, and is particularly useful for automobiles that require high reliability.

Sectional drawing which showed the structure of the capacitor | condenser by Embodiment 1 of this invention Top perspective view showing the configuration of the terminal board used in the capacitor (A) Exploded sectional view showing the configuration of the pressure regulating valve used in the capacitor, (b) Assembled sectional view before mounting, (c) Assembled sectional view after mounting (A) Exploded sectional view showing the configuration of the pressure regulating valve used in the capacitor according to the second embodiment of the present invention, (b) Assembled sectional view before the mounting, (c) The assembled sectional view after the mounting Sectional view showing the structure of a conventional capacitor Sectional drawing which showed the structure of the pressure regulation valve provided in the capacitor | condenser

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Capacitor element 1a Hollow part 2 Metal case 2a, 3a Protrusion 3, 5 Terminal board 3b Joint part 3c Anode terminal 3d, 5a Electrolyte injection hole 4 Insulation member 6 Elastic member 6a Engagement part 6b, 9a hole 7 Gas permeation | transmission Sheet 8, 10 Valve body 9 Metal member 10a Hook 10b Locking part

Claims (2)

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; The capacitor element is housed together with the driving electrolyte, and a bottomed cylindrical metal case in which one electrode of the capacitor element is bonded to the inner bottom surface, and the other electrode of the capacitor element is bonded to the inner surface to A capacitor comprising a terminal plate that seals the opening of the case and provided with a pressure regulating valve that also serves as a hole for injecting a driving electrolyte in the terminal plate, wherein the pressure regulating valve is a hole provided in the terminal plate. A rubber elastic member that is formed in a bottomed cylindrical shape that is provided on the peripheral surface on the opening portion side and that has a hole that communicates the inside and the outside on the peripheral surface on the bottom surface side; So as to close the hole in this elastic member A ring-shaped gas-permeable sheet in close contact with the peripheral surface of the bottom side of the elastic member, a capacitor is obtained is constituted by close contact a ring-shaped rubber valve body on the outer surface of the gas permeable sheet. The pressure regulating valve is in close contact with the peripheral surface of the metal member so as to close the hole provided in the metal member, and a bottomed cylindrical metal member provided with a hole communicating with the inside and the outside in a part of the peripheral surface. A ring-shaped gas permeable sheet, and a ring-shaped rubber that is in close contact with the outer surface of the gas permeable sheet and is press-fitted into the hole of the terminal plate, and has a flange that contacts the upper surface of the hole of the terminal plate The capacitor according to claim 1, wherein the capacitor is constituted by a valve body made of metal.

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