JP5167926B2 - Capacitors - Google Patents

Description

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

  7 is a cross-sectional view showing the structure of a conventional capacitor, FIG. 8 is a cross-sectional view showing the structure of a pressure regulating valve provided in the capacitor, and in FIGS. 7 and 8, 20 is an element, and 20a is a hollow. The anode and the cathode are respectively taken out from both end faces (vertical direction in FIG. 7) of the element 20.

  21 is a metal case made of aluminum containing the element 20 together with a driving electrolyte solution (not shown), 21a is a cathode terminal provided on the outer bottom surface of the metal case 21, and 21b is a protrusion provided on the inner bottom surface. The protrusion 21b is fitted into the hollow portion 20a of the element 20, and the end surface on the cathode side of the element 20 is mechanically and electrically joined to the inner bottom surface of the metal case 21 by laser welding or the like.

  22 is an aluminum sealing plate, 22a is an anode terminal provided on the surface side of the sealing plate 22, 22b is a protrusion provided on the inner surface side, 22c is a hole for electrolyte injection, and the anode side of the element 20 The end surface of the metal case 21 is mechanically and electrically joined to the inner surface of the sealing plate 22 by laser welding or the like, and processed so that the opening of the metal case 21 is wound on the periphery of the sealing plate 22 (generally curling and It is configured by being sealed.

  Reference numeral 23 denotes a pressure regulating valve provided on the surface side of the sealing plate 22, and the pressure regulating valve 23, as shown in detail in FIG. 8, is a gas permeable member 24 on the electrolyte injection hole 22 c. The closure body 25 is disposed and fixed so as to be covered with a metal cap 26 having a hole 26a communicating with the outside, thereby urging the closure body 25 in a constantly closing direction. In addition, the metal cap 26 is fixed by deforming an annular convex portion 22d previously provided on the sealing plate 22 so as to surround the periphery of the electrolyte injection hole 22c by caulking or the like. It is fixed by pressing.

  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 maintain 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. The electrolytic solution does not adhere to the closing body 25 and impair the function of the pressure regulating valve 23, and the leakage of the driving electrolytic solution to the outside of the capacitor can be prevented via the pressure regulating valve 23. .

  The conventional capacitor configured as described above can reduce the location where the driving electrolyte solution may leak by disposing and fixing the pressure regulating valve 23 in the electrolyte injection hole 22c. Therefore, a more reliable capacitor can 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 above conventional capacitor, although the leakage of the driving electrolyte is reduced by mounting the pressure adjustment valve 23 in the hole 22c for injecting the electrolyte, the pressure adjustment valve 23 assembles the capacitor. In addition, after injecting the driving electrolyte from the electrolyte injection hole 22c, each member is mounted directly on the electrolyte injection hole 22c, so that the assembly accuracy varies as it is. In addition to the problem that the performance of the pressure regulating valve 23 is likely to vary, there is a problem that the operation confirmation cannot be performed by the pressure regulating valve 23 alone.

  Furthermore, in automobile applications, higher reliability has been demanded from harsh usage environments, and there has been a problem that there is a demand for a pressure regulating valve that exhibits high operating performance even at high temperatures. .

  Further, a pair of electrodes formed on both end faces of the element 20 are mechanically and electrically joined to the inner surface of the sealing plate 22 and the inner bottom surface of the metal case 21 by laser welding, respectively, thereby reducing the number of parts and reducing the size. However, since the laser welding is performed by irradiating laser light from the outside of the sealing plate 22 and the metal case 21, it is difficult to check the welding state. Since the conditions are also strict and limited to a narrow range, there is a problem that it is difficult to guarantee the reliability related to the connection for extracting the electrodes.

  The present invention solves such a conventional problem, has a pressure adjustment valve that has a small operation variation, exhibits a high operation performance even at a high temperature and can be inspected as a single unit, and is used for connection for electrode extraction. It is an object of the present invention to provide a capacitor capable of guaranteeing the reliability to be summarized in a high dimension.

In order to solve the above problems, the present invention accommodates an element configured to take out electrodes from both end faces together with a driving electrolyte, and a metal case in which one electrode of the element is joined to the inner bottom surface, and the other of the element The electrode plate is joined to the inner surface, a terminal plate disposed in the opening of the metal case, a pressure regulating valve coupled to the inside of the terminal plate, and disposed on the upper surface of the terminal plate for sealing. In a capacitor made of sealing rubber, the pressure regulating valve is arranged by placing a rubber valve body in a metal cap having a hole communicating with the outside, and press-fitting a ring-shaped washer into the cap. The valve body is composed of a valve unit that holds the valve body in a compressed state, and a ring-shaped washer that is fitted in the cap so as to be disposed under the valve unit by joining a gas permeable sheet. Adjust valve up And caulking are embedded in a recess provided in the inner surface of the terminal plate, is of structure in which the space between the upper inner and upper outer surface of the cap of the recess.

  As described above, the capacitor according to the present invention can be used as a valve unit by using a pressure regulating valve that constitutes a valve unit that holds a valve body in a compressed state by press-fitting a washer into a cap provided with the valve body. Since the assembly accuracy can be greatly improved, not only can the operation variation as a pressure adjustment valve be reduced and stable performance can be demonstrated, but the valve unit alone can be used as a pressure adjustment valve. It is possible to confirm the operation, and furthermore, the pressure regulating valve can be used up to a high pressure because the pressure regulating valve is embedded in the inner surface of the terminal plate and caulked and joined. is there.

(Embodiment 1)
In the following, the first and second aspects of the present invention will be described with reference to the first embodiment.

  1 is a cross-sectional view showing the structure of a capacitor according to Embodiment 1 of the present invention (however, the terminal plate is not a cross-sectional view), and FIG. 2 is a cross-sectional view of the main part showing the structure of a sealing portion of the capacitor. 3 (a) to (c) are a plan view, a front sectional view and a side view showing the configuration of a terminal plate used in the capacitor, and FIGS. 4 (a) to (c) are sealing rubbers used in the capacitor. It is the front sectional view which showed the structure of this, a back view, and a side sectional view.

  1 to 4, reference numeral 1 denotes an element, 1c denotes a hollow portion formed in the element 1, and the 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. 1 are shifted from each other in the opposite direction and wound with a separator interposed therebetween (all not shown). From both end faces (vertical direction in FIG. 1) of the element 1, an anode 1a (in FIG. 1) is formed. The upper side and the cathode 1b (lower side in FIG. 1) are respectively taken out.

  2 is a terminal plate made of aluminum, 2a is a flange provided at the lower end of the terminal plate 2, 2b is a terminal portion for external connection, 2c is a recess provided inside, and a pressure described later in the recess 2c. The regulating valve 3 is embedded and crimped. 2d is an annular portion provided in the opening of the recess 2c, a processed portion formed so that the tip forms an acute angle, 2e is a through-hole provided so as to communicate the recess 2c with the outside, and 2f The convex portions 2g provided on the upper surface side of the portion 2a are holes for electrolyte injection provided in the convex portions 2f.

  Reference numeral 3 denotes a pressure regulating valve embedded in the terminal plate 2 by being embedded in a recess 2c provided in the terminal plate 2 and being caulked and connected. The pressure regulating valve 3 will be described in detail below. 4 is a bottomed cylindrical stainless steel cap provided with a flange 4a at the open end, a hole 4b communicating with the outside, and a cut-and-raised portion 4c projecting toward the inner surface on a part of the peripheral surface. A valve body 6 made of butyl rubber is an aluminum ring-shaped washer provided with a hole in the center portion and an annular wall portion integrally provided on the upper surface periphery. The valve body is formed on the inner bottom surface of the washer 6. In this state, the washer 6 is press-fitted into the cap 4 to hold the valve body 5 in a compressed state, thereby constituting a valve unit.

  The press-fitting of the washer 6 into the cap 4 can be performed with high precision by controlling the press-fitting dimensions by using a jig (not shown). The cut-and-raised part 4c provided in a part bites into the wall part of the washer 6 made of aluminum, and higher bond strength can be obtained.

  7 is a ring washer made of aluminum with a hole in the center, 8 is a gas permeable sheet joined to the lower surface side of this washer 7, and this gas permeable sheet 8 is made of polytetrafluoroethylene (PTFE). And the washer 7 is bonded by heat fusion using a modified PP, and the washer 7 to which the gas permeable sheet 8 is bonded in this way is connected to the valve. It is press-fitted into the cap 4 so as to be disposed at the lower part of the unit.

  9 is a rubber O-ring, 10 is an aluminum ring-shaped washer having a hole in the center, and this washer 10 is provided on the terminal plate 2 together with the cap 4 into which the valve unit and the washer 7 are press-fitted. After being embedded in the recessed portion 2c, the annular processed portion 2d provided in the opening portion of the recessed portion 2c is coupled by caulking, whereby the pressure regulating valve 3 is built in the terminal plate 2. It is what has become.

  The pressure regulating valve 3 configured in this way prevents the permeation of the driving electrolyte and allows only the gas to permeate by the gas permeable sheet 8 when the pressure inside the capacitor rises to a predetermined pressure or higher. Therefore, the gas whose pressure has increased pushes up the valve body 5 and escapes into the cap 4 from the interface between the valve body 5 and the washer 6, and escapes into the recess 2 c provided in the terminal plate 2 through the hole 4 b provided in the cap 4. At the same time, it is discharged to the outside through the through hole 2e provided in the recess 2c. After operating in this way, the state before the operation is restored to maintain the airtightness inside the capacitor. It can be self-returning type.

  Further, the terminal plate 2 in which the pressure regulating valve 3 is built in this way is overlapped with the anode 1a of the element 1, and laser welding is performed from the upper surface side of the flange portion 2a provided on the terminal plate 2, whereby the flange portion 2a and The anode 1a of the element 1 is mechanically and electrically joined, and the anode 1a of the element 1 is thereby taken out from the terminal plate 2.

  Reference numeral 11 denotes an aluminum bottomed cylindrical metal case that houses the element 1 to which the terminal plate 2 is bonded together with a driving electrolyte solution (not shown), and 11 a is a joint provided on the inner bottom surface of the metal case 11. After the element 1 is inserted into the metal case 11, the cathode 1 b of the element 1 and the joint 11 a provided on the metal case 11 are brought into close contact with each other, and laser welding is performed from the outer bottom surface side of the metal case 11. In this way, the cathode 1b of the element 1 is taken out from the metal case 11.

  Reference numeral 12 denotes an insulating ring for insulating between the terminal plate 2 and the metal case 11, and the insulating ring 12 is positioned by providing a lateral groove processing portion 11 d in the metal case 11.

  13 is an insulating sealing rubber made of butyl rubber or the like disposed on the upper surface of the terminal plate 2, 13 a is a through hole that is provided at the center of the sealing rubber 13 and fits into the terminal portion 2 b of the terminal plate 2, 13b is a concave portion provided on the upper surface side, 13c is a concave portion provided on the lower surface side, 13d is a convex portion provided in the concave portion 13c, and the sealing rubber 13 is disposed on the upper surface of the terminal plate 2. As a result, the convex portion 2 f provided on the upper surface of the terminal plate 2 fits into the concave portion 13 c provided on the lower surface of the sealing rubber 13, and the electrolyte injection hole 2 g provided on the terminal plate 2. The convex part 13d provided in the sealing rubber 13 is comprised so that it may fit.

  The sealing rubber 13 configured in this manner and disposed on the upper surface of the terminal board 2 is formed by drawing the vicinity of the opening of the metal case 11 from the outer periphery (lateral groove drawing part 11b). In addition to being compressed, sealing is performed by curling the opening end of the metal case 11 (curling processing portion 11c) to press down the upper surface of the sealing rubber 13. Reference numeral 14 denotes a reinforcing plate made of a bake plate fitted in a recess 13b provided on the upper surface of the sealing rubber 13, which is arranged for the purpose of increasing the sealing strength by the sealing rubber 13, and the present invention. Is not directly related and not essential.

  The capacitor according to the present embodiment configured as described above includes a valve unit that holds the valve body 5 in a compressed state by pressing the washer 6 into the cap 4 in which the valve body 5 is disposed. As a result, the assembly accuracy of the valve unit can be greatly improved. As a result, the operation variation of the pressure regulating valve 3 can be reduced and stable performance can be exhibited. Not only that, it is also possible to confirm the operation of the pressure adjustment valve 3 with a single valve unit.

  Further, the pressure regulating valve 3 is embedded in the terminal plate 2, and the connection of the pressure regulating valve 3 to the terminal plate 2 is connected to an annular processed portion 2 d provided in the opening of the recess 2 c of the terminal plate 2. Since the coupling is performed by caulking, a high coupling strength can be obtained, and for this reason, it is possible to cope with a high pressure rise inside the capacitor.

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

  The present embodiment is different from the first embodiment in that a metal current collector plate is joined to one electrode of the element used in the capacitor described with reference to FIGS. Since the configuration is the same as that of the first embodiment, the same reference numerals are given to the same parts and the detailed description thereof is omitted, and only different parts will be described in detail with reference to the drawings.

  FIG. 5 is a cross-sectional view showing the configuration of the capacitor according to the second embodiment of the present invention. In FIG. 5, reference numeral 15 denotes a through hole provided in the center, and the anode 1a formed on one end face of the element 1 is connected to the anode 1a. The current collecting plate 15 is formed by processing an aluminum plate, and is mechanically and electrically joined to the anode 1a of the element 1 by laser welding. It is what.

  Then, the terminal plate 2 is overlaid on the current collector plate 15 joined to the anode 1a of the element 1 in this manner, and laser welding is performed from the upper surface side of the flange portion 2a provided on the terminal plate 2, whereby the flange portion 2a and The peripheral edge of the current collector plate 15 is mechanically and electrically joined, whereby the anode 1 a of the element 1 is taken out from the terminal plate 2.

  In the capacitor according to the present embodiment configured as described above, in addition to the effect obtained by the capacitor according to the first embodiment, the current collecting plate 15 is joined to the anode 1a formed on the end face of the element 1, and this current collecting is performed. With the configuration in which the plate 15 is bonded to the terminal plate 2, not only can the current state of the current collecting plate 15 be easily confirmed and inspected when the current collecting plate 15 is bonded to the element 1, When joining to the terminal board 2, since it can be performed under a wide range of joining conditions, the work is facilitated, and the reliability related to the connection for drawing out the electrode can be greatly improved. is there.

  In the present embodiment, the current collecting plate 15 is joined to the anode 1a of the element 1 and this current collecting plate 15 is joined to the inner surface of the terminal plate 2. However, the present invention is not limited to this. The current collecting plate is not limited, and the current collecting plate may be joined to the cathode 1b of the element 1 and the current collecting plate may be joined to the inner bottom surface of the metal case 11, thereby obtaining the same effect. Is.

(Embodiment 3)
The third embodiment of the present invention will be described below in particular.

  In the present embodiment, the configuration of the valve body of the pressure regulating valve used in the capacitor described in the first embodiment with reference to FIGS. 1 to 4 is partially different. Since they are the same as those in 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 below with reference to the drawings.

  FIG. 6 is a cross-sectional view of the main part showing the structure of the sealing portion of the capacitor according to Embodiment 3 of the present invention. In FIG. 6, 16 is a pressure regulating valve, 17 is a valve body made of silicon rubber, and 18 is made of butyl rubber. With the packing 18 and the valve body 17 placed on the inner bottom surface of the washer 6, the washer 6 is press-fitted into the cap 4 so that the valve body 17 and the packing 18 are compressed. This holds the valve unit.

  In the capacitor according to the present embodiment configured as described above, in addition to the effects obtained by the capacitors according to the first and second embodiments, the valve body 17 constituting the pressure regulating valve 16 is made of silicon rubber. Has a special effect of being excellent in heat resistance.

  It should be noted that such excellent heat resistance is due to the use of silicon rubber as the material of the valve body 17, but silicon rubber can exhibit excellent performance at both high and low temperatures, It is inferior to moisture barrier properties, and in order to ensure this moisture barrier property, the butyl rubber packing 18 is disposed on the bottom surface of the valve body 17 (inside the capacitor) to maintain high moisture barrier properties. It is what you do.

  The capacitor according to the present invention has an effect of reducing the operation variation of the pressure regulating valve and confirming the operation of the pressure regulating valve alone, and can cope with a high pressure, and particularly high reliability is required. It is useful as a capacitor in the automotive field.

Sectional drawing which showed the structure of the capacitor by Embodiment 1 of this invention Cross-sectional view of the main part showing the structure of the sealing part of the capacitor (A) The top view which showed the structure of the terminal board used for the capacitor, (b) The front sectional view, (c) The side view (A) Front sectional view showing the configuration of the sealing rubber used in the capacitor, (b) Rear view, (c) Side sectional view Sectional drawing which showed the structure of the capacitor by Embodiment 2 of this invention Sectional drawing which shows the principal part structure which showed the sealing part of the capacitor by Embodiment 3 of this invention Sectional view showing the structure of a conventional capacitor Sectional drawing which showed the structure of the pressure regulation valve provided in the capacitor

Explanation of symbols

1 element 1a anode 1b cathode 1c hollow part 2 terminal plate 2a, 4a collar 2b terminal part 2c, 13b, 13c concave part 2d processed part 2e, 13a through hole 2f, 13d convex part 2g electrolyte injection hole 3, 16 pressure Adjusting valve 4 Cap 4b Hole 4c Cut-and-raised part 5, 17 Valve body 6, 7, 10 Washer 8 Gas permeable sheet 9 O-ring 11 Metal case 11a Joint part 11b Horizontal groove drawing part 11c Curling part 11d Horizontal groove part 12 Insulation Ring 13 Sealing rubber 14 Reinforcement plate 15 Current collector plate 18 Packing

Claims (7)

An element configured to take out positive and negative electrodes from both end faces, a bottomed cylindrical metal case containing the element together with a driving electrolyte, and joining one electrode of the element to the inner bottom surface, and the element A terminal plate that is joined to the inner surface of the metal case and disposed at the opening of the metal case, a pressure regulating valve that is coupled to the inside of the terminal plate, and a metal that is disposed on the upper surface of the terminal plate. In a capacitor made of a sealing rubber that is compressed and sealed by processing the open end of the case, the pressure regulating valve has a rubber valve element disposed in a metal cap having a hole communicating with the outside. The valve unit that holds the valve body in a compressed state by press-fitting a ring-shaped washer into the cap and the gas permeable sheet are joined to each other so that the valve unit is disposed below the valve unit. Fitted in the cap Is constituted by a ring-shaped washer, the pressure regulating valve and caulking are embedded in a recess provided in an inner surface of the terminal plate, the space provided between the upper inner surface and the upper outer surface of the cap of the recess capacitor was. The capacitor according to claim 1, wherein a metal current collector plate is bonded to at least one of the electrodes of the element, and the current collector plate is bonded to the inner surface of the terminal plate. A pressure regulating valve is arranged by placing a butyl rubber packing and a silicon rubber valve in a metal cap with a hole communicating with the outside, and press-fitting a ring-shaped washer into the cap. A valve unit that holds the packing and the valve body in a compressed state, and a ring-shaped washer fitted into the cap so as to be disposed under the valve unit by joining a gas permeable sheet. The capacitor according to claim 1 or 2. The capacitor according to claim 1, wherein an annular wall portion is provided on a peripheral edge of an upper surface of a ring-shaped washer constituting the valve unit of the pressure regulating valve. The capacitor according to claim 1 or 3, wherein a cut-and-raised portion that protrudes toward the inner surface side is provided on at least a part of a peripheral surface of a metal cap constituting the valve unit of the pressure regulating valve. The capacitor according to claim 1 or 3, wherein a porous film made of PTFE (polytetrafluoroethylene) is used as a gas permeable sheet joined to a ring-shaped washer constituting a pressure regulating valve. The joining of the gas permeable sheet joined to the ring-shaped washer constituting the pressure regulating valve to the ring-shaped washer is performed by heat-sealing the modified polypropylene. Capacitor.

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