JP5130942B2 - 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.

FIG. 18 is a cross-sectional view showing the structure of this type of conventional capacitor. In FIG.
Reference numeral 5 denotes an element, and 25a denotes a hollow portion formed in the element 25. The element 25 has a pair of positive and negative electrodes in which a polarizable electrode layer is formed on a current collector made of aluminum foil and is shifted in the opposite direction to each other In this configuration, a separator is interposed between them and wound (all not shown), and an anode and a cathode are respectively taken out from both end faces (vertical direction in FIG. 18) of the element 25.

  Reference numeral 26 denotes an aluminum bottomed cylindrical metal case that accommodates the element 25 together with a driving electrolyte (not shown), and 26a is a protrusion integrally provided on the inner bottom surface so as to be fitted into the hollow portion 25a of the element 25. The projection 26a is fitted into the hollow portion 25a of the element 25, and the end face on the cathode side of the element 25 inserted into the metal case 26 is mechanically bonded to the inner bottom surface of the metal case 26 by means such as laser welding, In addition, they are electrically connected. Reference numeral 26b denotes a drawing processed portion having a V-shaped cross section provided on the metal case 26, and presses the peripheral edge of the element 25 on the upper side in the drawing from the outside.

  27 is a terminal board made of aluminum, 27a is an anode terminal for external connection integrally provided on the outer surface side of the terminal board 27, and 27b is a joint portion with the end face on the anode side of the element 25 provided on the inner surface side. 27c are protrusions that fit into the hollow portion 25a of the element 25, and the anode side end face of the element 25 is mechanically and electrically joined to the joint portion 27b by means such as laser welding. It is.

  Reference numeral 28 denotes an insulating ring formed in a ring shape and disposed at the upper end of the drawing portion 26 b provided on the metal case 26, and the insulating ring 28 includes the inner surface of the metal case 26 and the outer peripheral surface of the terminal plate 27. Insulation between the terminal plate 27 and the metal case 26 is maintained by connecting to a part of the inner peripheral edge of the terminal plate 27 from between the terminal plate 27 and the metal case 26.

  Reference numeral 29 denotes a ring-shaped sealing rubber made of an insulating rubber, and is disposed around the surface periphery of the terminal plate 27 so that the opening of the metal case 26 is wound with the sealing rubber 29 interposed. It is sealed by forming a curled portion 26c by processing (generally called curling processing).

  In the conventional capacitor thus configured, a pair of electrodes formed on both end surfaces of the element 25 are joined to the inner surface of the terminal plate 27 and the inner bottom surface of the metal case 26, respectively, thereby reducing the number of components and reducing the size. (Patent Document 1).

  19 is a cross-sectional view showing another configuration of the conventional capacitor, FIG. 20 is a cross-sectional view showing a configuration of a pressure regulating valve provided in the capacitor, and in FIGS. An element 30a indicates a hollow portion, and is configured such that an anode and a cathode are respectively taken out from both end faces (vertical direction in FIG. 19) of the element 30.

  31 is a metal case made of aluminum containing the element 30 together with a driving electrolyte (not shown), 31a is a cathode terminal provided on the outer bottom surface of the metal case 31, and 31b is a protrusion provided on the inner bottom surface. The protrusion 31b is fitted into the hollow portion 30a of the element 30, and the end face on the cathode side of the element 30 is mechanically and electrically joined to the inner bottom surface of the metal case 31 by laser welding or the like.

  32 is an aluminum sealing plate, 32a is an anode terminal provided on the surface side of the sealing plate 32, 32b is a protrusion provided on the inner surface side, 32c is a hole for electrolyte injection, and the anode side of the element 30 The end surface of the metal case 31 is mechanically and electrically joined to the inner surface of the sealing plate 32 by laser welding or the like, and processed so that the opening of the metal case 31 is wound on the periphery of the sealing plate 32 (generally, curling processing and It is configured by being sealed.

  33 is a pressure regulating valve provided on the surface side of the sealing plate 32. As shown in detail in FIG. 20, the pressure regulating valve 33 is formed on the gas permeable member 34 on the electrolyte injection hole 32c. The closure body 35 is disposed, and is fixed so as to be covered with a metal cap 36 having a hole 36a communicating with the outside, thereby urging the closure body 35 in a constantly closing direction. The metal cap 36 is fixed by deforming an annular convex portion 32d provided in the sealing plate 32 so as to surround the periphery of the electrolyte injection hole 32c in advance by caulking or the like. It is fixed by pressing.

  The pressure regulating valve 33 is a self-reset 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 33 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 increases due to gas generation inside the capacitor. The appearance is not abnormal, and the characteristics can be maintained.

  In addition, the pressure regulating valve 33 is provided with a gas-permeable member 34 made of a material that prevents the permeation of the driving electrolyte and that transmits the gas generated inside the capacitor to the outside, thereby closely driving. The electrolytic solution does not adhere to the closing body 35 and the function of the pressure regulating valve 33 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 33. .

The conventional capacitor configured as described above can reduce the potential leakage of the driving electrolyte by disposing and fixing the pressure regulating valve 33 in the electrolyte injection hole 32c. Thus, a more reliable capacitor can be obtained (Patent Document 2).
JP 2006-324641 A JP 2004-134632 A

  However, in the conventional capacitor shown in FIG. 18 (the conventional capacitors shown in FIGS. 19 and 20 are also the same), the pair of electrodes formed on both end surfaces of the element 25 are connected to the inner surface of the terminal plate 27 and the metal case 26. By mechanically and electrically joining the inner bottom surface by laser welding, the number of parts can be reduced and the size can be reduced. The laser welding is performed by laser from the outside of the terminal plate 27 and the metal case 26, respectively. Since it is a method of irradiating with light, not only is it difficult to check the welding state, but also the welding conditions are limited to a narrow range, so the connection for electrode extraction is combined. There was a problem that it was difficult to guarantee reliability.

  In the conventional capacitors shown in FIGS. 19 and 20, the pressure adjusting valve 33 is attached to the electrolyte injection hole 32c to reduce the leakage of the driving electrolyte, The pressure regulating valve 33 is mounted by assembling capacitors and injecting a driving electrolyte from the electrolyte injection hole 32c, and then directly mounting each member on the electrolyte injection hole 32c. In addition to the problem that the variation in assembly accuracy directly leads to the variation in operation and the performance of the pressure adjustment valve 33 is likely to vary, there is a problem that the operation check cannot be performed by the pressure adjustment valve 33 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. .

  The present invention solves such a conventional problem, guarantees a high level of reliability related to connection for electrode lead-out, exhibits little operation variation, exhibits high operation performance even at high temperatures, and is a single unit. An object of the present invention is to provide a capacitor including a pressure regulating valve that can be inspected.

In order to solve the above problems, the present invention contains an element, a current collector plate processed from a single flat metal bonded to each electrode of the element, the element together with a driving electrolyte, and a bottomed cylindrical metal case joined to the inner bottom surface of the bonded collector plate to one of the electrodes of the element, the metal bonded under surface of the current collector plate joined to the other electrode of the device case and the terminal plate which is disposed in the opening of insulating a pressure regulating valve provided in the terminal plate, the cross is disposed between the inner peripheral surface of the outer peripheral surface and the metal case of the terminal plate together consist annular sealing rubber to perform sealing is compressed by processing the metal casing, provided at a lower end of said terminal plate and a flange portion provided in the annular to the lower surface of the sealing rubber, the upper Symbol element the other electrode is joined to the lower surface of the current collecting plate, above the terminal plate on the periphery of the upper surface of the current collecting plate Those of the joined structure directly to the lower surface of the parts superposed annular.

  In addition, the pressure regulating valve is disposed by overlapping a butyl rubber packing and a silicon rubber valve body in a metal cap having a communication hole with the outside, and a ring-shaped washer at an opening of the cap. A valve unit that holds the packing and the valve body in a compressed state, and a ring-shaped pressing rubber and a gas permeable sheet disposed above the hole for electrolyte injection provided on the terminal plate. The pressure rubber is held in a compressed state by coupling the valve unit to a terminal plate.

  As described above, the capacitor according to the present invention has a structure in which a current collecting plate is joined to each electrode on both end faces of the device, and this current collecting plate is joined to a terminal plate and a metal case, respectively. Not only can the confirmation and inspection of the joining state be performed easily at the time of joining the plates, but also the work can be done easily because a wide range of welding conditions can be used when joining the current collector plate to the terminal plate and metal case. Thus, it is possible to greatly improve the reliability associated with the connection for extracting the electrodes.

  In addition, the pressure adjustment valve that constitutes the valve unit that holds the valve body in a compressed state by press-fitting a washer into the cap provided with the valve body can greatly improve the assembly accuracy of the valve unit. Therefore, not only can the operation variation as a pressure regulating valve be reduced and stable performance can be demonstrated, but also the operation of the pressure regulating valve as a single unit can be confirmed. It is obtained.

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

  FIG. 1 is a cross-sectional view showing a configuration of a capacitor according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view of a main part showing a sealing portion of the capacitor, and FIG. 3 is a view of both end faces of an element used in the capacitor 4 is a perspective view showing a state before the current collector plate is joined to the electrode, FIG. 4 is a cross-sectional view showing the state where the current collector plate is joined, and FIG. 5 is a diagram showing the terminal plate joined to the anode current collector plate of FIG. It is sectional drawing which showed the state.

  1 to 5, 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 an anode current collecting plate joined to the anode 1a formed on one end face of the element 1, and 3 is a cathode current collecting plate joined to the cathode 1b similarly formed on the other end face of the element 1. The anode current collector plate 2 and the cathode current collector plate 3 are formed by processing an aluminum plate, and are superposed on the anode 1a and the cathode 1b of the element 1 and laser-welded, thereby mechanically and electrically. It is what is joined.

  4 is a terminal plate, 4a is a flange provided at the lower end of the terminal plate 4, and this terminal plate 4 is superimposed on the anode current collector plate 2 joined to the anode 1a of the element 1 to By laser welding from the upper surface side of the provided flange part 4a, the flange part 4a and the peripheral edge of the anode current collector plate 2 are joined mechanically and electrically. The anode 1a is taken out from the terminal plate 4.

  Reference numeral 5 denotes an aluminum bottomed cylindrical metal case containing the element 1 to which the anode current collector plate 2, the cathode current collector plate 3 and the terminal plate 4 are joined together with a driving electrolyte (not shown). This is a joint provided by forming the inner bottom surface of the case 5 in a partially convex shape. After the element 1 is inserted into the metal case 5, the cathode current collector joined to the cathode 1 b of the element 1. The plate 3 and the joint portion 5a provided on the metal case 5 are brought into close contact with each other and laser-welded from the outer bottom surface side of the metal case 5 to be mechanically and electrically joined. 1 cathode 1b is taken out from the metal case 5.

  The flat portion 5d formed by recessing a part of the peripheral surface on the opening side of the metal case 5 is connected to a plurality of capacitors through a connecting member (not shown) to form a metal. The case 5 is provided with a flat surface portion 5d so that the connecting member can be easily laser-welded, and is not directly related to the present invention and is not indispensable.

  6 is a pressure regulating valve (details will be described later) connected so as to close the electrolyte injection hole 4b provided in the terminal plate 4, and 7 is a sealing rubber made of insulating rubber (details will be described later). Yes, with the sealing rubber 7 disposed on the upper surface of the flange 4a provided at the lower end of the terminal plate 4, the vicinity of the opening of the metal case 5 is drawn from the outer periphery (lateral groove drawing portion 5b). Thus, the sealing rubber 7 is compressed, and the opening end of the metal case 5 is curled (curling processed portion 5c) so as to press down the upper surface of the sealing rubber 7.

  6A and 6B are a plan view and a front sectional view showing the configuration of the anode current collector 2 joined to the anode 1a of the element 1, and FIGS. 7A and 7B are the same. FIG. 2 is a plan view and a front sectional view showing the configuration of the cathode current collector plate 3 bonded to the cathode 1b of the element 1, and both the anode current collector plate 2 and the cathode current collector plate 3 have a hollow portion 1c formed in the element 1. Protrusions 2a and 3a that fit into the holes are provided, and holes 2b and 3b through which the driving electrolyte solution passes are provided. It should be noted that the holes 2b and 3b through which the driving electrolyte solution passes are provided with a larger number of holes 2b in the anode current collecting plate 2 in view of injecting the driving electrolyte solution from the anode current collecting plate 2 side. It is what.

  FIGS. 8A and 8B are a plan view and a front sectional view showing the structure of an aluminum terminal plate 4 which is overlapped and joined to the anode current collector plate 2. In FIG. Is a flange provided at the lower end, 4b is a hole for injecting a driving electrolyte, 4c is a recess for mounting a pressure regulating valve 6 described later, and 4d is a projection for caulking the pressure regulating valve 6 in the same manner. .

  FIGS. 9A and 9B show an insulating rubber for sealing the opening of the metal case 5 (in this embodiment, butyl rubber is used, but the present invention is not limited to this). FIG. 9 is a plan view and a front sectional view showing the structure of an annular sealing rubber 7 made up of (a), and in FIG. 9, 7a is an annular wall provided so as to protrude from the inner periphery of the upper end, and 7b is the lower end. It is an annular wall provided so as to protrude from the outer periphery. The upper wall portion 7a thus configured is in close contact with the outer peripheral surface of the upper side of the terminal plate 4, and the lower wall portion 7b is connected to the lower side of the terminal plate 4 and the outer peripheral surface of the anode current collector plate 2. The metal case 5 is in close contact with the inner peripheral surface. The upper wall portion 7a and the lower wall portion 7b are not necessarily required for both, and may be provided only in one of the portions necessary for product design.

  FIG. 10 is a cross-sectional view showing the configuration of the pressure regulating valve 6 coupled so as to close the electrolyte injection hole 4b of the terminal plate 4. FIG. 11 is an exploded cross-sectional view of the pressure regulating valve. 10 and 11, 8 is a bottomed cylindrical stainless steel cap provided with a flange 8 a at the open end and a hole 8 b communicating with the outside, and 9 is formed in a bottomed cylindrical shape. The silicon rubber valve body, 10 is a packing made of butyl rubber, 11 is a ring washer made of aluminum in which a hole 11a is provided in the central portion, and an annular wall portion 11b is integrally provided on the periphery of the upper surface. The washer 11 is press-fitted into the cap 8 with the packing 10 and the valve body 9 placed on the inner bottom surface of the washer 11, thereby holding the valve body 9 and the packing 10 in a compressed state. This allows the valve unit Those that make up the 12.

  The press-fitting of the washer 11 into the cap 8 can be performed with high accuracy by controlling the press-fitting dimensions by using a jig (not shown). When the washer 11 is press-fitted into the cap 8, the cap 8 made of stainless steel is provided by providing a notch in the portion and providing a cut-and-raised portion 8c processed so that the notch protrudes into the cap 8. The cut-and-raised portion 8c bites into the aluminum washer 11 so that press-fitting with higher bond strength can be performed.

  Reference numeral 13 denotes a ring-shaped pressing rubber made of butyl rubber having a hole 13a at the center, and the pressing rubber 13 is inserted into a recess 4c provided above the electrolyte injection hole 4b provided in the terminal plate 4. The valve unit 12 is disposed in the disposed state, and the protrusion 4d provided on the terminal plate 4 is crimped to press and contact the flange 8a provided at the opening end of the cap 8 to be mechanically coupled. Thus, the pressing rubber 13 is held in a compressed state.

  14 is a gas permeable sheet made of a porous film made of polytetrafluoroethylene (PTFE), and this gas permeable sheet 14 uses modified PP on the bottom surface of the ring-shaped washer 11 constituting the valve unit 12. Although an example of joining by heat sealing is shown, the gas permeable sheet 14 is joined to the upper surface of the electrolyte injection hole 4b provided in the terminal plate 4 after the electrolyte injection by the same means. Is also good.

  When the pressure inside the capacitor rises to a predetermined pressure or higher, the pressure regulating valve 6 configured in this manner prevents the driving electrolyte from passing through the gas permeable sheet 14 and transmits only gas. The gas whose pressure has been increased pushes up the packing 10 and the valve body 9 to escape from the interface between the packing 10 and the washer 11 into the cap 8 and is released to the outside through the hole 8 b provided in the cap 8. In addition, after the operation as described above, the self-recovering type can return to the state before the operation and maintain the airtightness inside the capacitor. As a result, the assembly accuracy as the valve unit 12 can be greatly improved, so that not only the operation variation as the pressure regulating valve 6 can be reduced and stable performance can be exhibited, but also the valve unit 12 can be exhibited. It is possible to obtain a special effect that the operation of the pressure regulating valve 6 can be confirmed by itself.

  Further, the structure in which the valve body 9 is made of silicon rubber and the valve body 9 is placed on the packing 10 made of butyl rubber can provide an effect of excellent heat resistance. For the purpose of confirmation, the results of a high-temperature test in an atmosphere at 85 ° C. are shown in FIGS. 12 and 13 in comparison with a conventional product (using only a valve body made of butyl rubber and no packing). FIG. 12 shows the change in operating pressure of the pressure regulating valve over time, and FIG. 13 shows the change in operating pressure maintenance rate over time obtained from the test results.

  As is apparent from FIGS. 12 and 13, the pressure regulating valve 6 according to the embodiment of the present invention shows a high value of operating pressure of 0.6 MPa and operating pressure maintenance rate of 87.4% even after 300 hours have elapsed. On the other hand, the pressure control valve of the conventional product has a low value of operating pressure at 0.35MPa and operating pressure maintenance rate of 46.7% after 300 hours (no problem in general guarantee) The pressure regulating valve 6 of the present invention using the valve body 9 made of silicon rubber and the packing 10 made of butyl rubber has a stable operation at a high temperature and is well understood to have excellent heat resistance. Is.

  This excellent heat resistance is due to the use of silicon rubber as the material for the valve body 9, but silicon rubber can exhibit excellent performance at both high and low temperatures, but it also blocks moisture. In order to ensure this moisture barrier property, the butyl rubber packing 10 is disposed on the bottom surface of the valve body 9 (inside the capacitor) so as to maintain a high moisture barrier property. It is a thing.

  Further, for the purpose of improving the operability of the pressure regulating valve 6 by improving the close contact state between the silicone rubber valve body 9 and the butyl rubber packing 10, the surface of the silicone rubber valve body 9 is polyparalyzed. It is effective by coating xylylene or the like.

  Further, by joining the valve body 9 made of silicon rubber and the packing 10 made of butyl rubber in advance using a double-sided tape or the like, workability at the time of assembly can be improved.

  Further, even if the silicon rubber valve body 9 and the butyl rubber packing 10 are not used in combination, the above-mentioned butyl rubber can be obtained by using fluorine rubber having excellent low temperature characteristics as a material for the valve body 9. It is possible to construct a pressure regulating valve only with a fluorine rubber valve body having excellent low temperature characteristics without using the packing 10 made of metal, and satisfy all of high temperature, low temperature and gas permeability. In this case, the fluororubber having excellent low-temperature characteristics is extremely expensive, so that the practicality is low, which is not preferable.

  In the present embodiment, for the purpose of ensuring higher heat resistance, the configuration in which the silicon rubber valve body 9 and the butyl rubber packing 10 are used in combination has been described as an example. The present invention is not limited, and if the general heat resistance is sufficient, the effect of the present invention can be sufficiently obtained even with a configuration in which only a butyl rubber valve body is used and no packing is used as in the conventional product. Is.

  As described above, in the capacitor according to the present embodiment, the current collector plates 2 and 3 are joined to the electrodes 1a and 1b formed on the both end surfaces of the element 1, respectively. In addition, the configuration in which the current collector plates 2 and 3 are joined to the element 1 allows the confirmation and inspection of the joined state to be easily performed at the time when the current collector plates 2 and 3 are joined to the element 1. 3 can be performed under a wide range of welding conditions when joining to the terminal plate 4 and the metal case 5, respectively, so that the work becomes easy and the reliability associated with the connection for electrode extraction can be greatly improved. This is a special effect.

  Further, the pressure adjusting valve 6 is configured as a valve unit 12 that holds the valve body 9 in a compressed state by press-fitting a washer 11 into a cap 8 in which the valve body 9 is disposed. As a result, it is possible to greatly improve the assembly accuracy of the pressure control valve 6, thereby reducing the variation in operation as the pressure regulating valve 6 and exhibiting stable performance. This brings about a special effect that the operation of the pressure regulating valve 6 can be confirmed. Furthermore, the valve body 9 is made of silicon rubber, and this is placed on the butyl rubber packing 10 so as to have a special effect of being excellent in heat resistance.

  Moreover, wall portions 7 a and 7 b projecting from the inner peripheral portion of the upper end of the sealing rubber 7 that seals the opening of the metal case 5 and the outer peripheral portion of the lower end are provided, and the sealing rubber 7 is compressed by drawing the metal case 5. With this configuration, the sealing performance is enhanced, and the metal case 5 and the terminal plate 4 can be prevented from being short-circuited even when moisture adheres or is abnormally used. .

(Embodiment 2)
Hereinafter, the invention according to the fourth aspect of the present invention will be described with reference to the second embodiment.

  In the present embodiment, the configuration of the pressure regulating valve used for the capacitor described in the first embodiment with reference to FIGS. 1 to 13 is partially different, and the other configurations are the first embodiment. Therefore, the same parts are denoted by the same reference numerals and detailed description thereof will be omitted, and only different parts will be described in detail below with reference to the drawings.

  FIG. 14 is a cross-sectional view showing the configuration of the pressure regulating valve used in the capacitor according to the second embodiment of the present invention, and FIG. 15 is an exploded cross-sectional view of the pressure regulating valve. , 15 is a pressure regulating valve, 4 is a terminal plate, and 4b is a hole for electrolyte injection provided in the terminal plate 4.

  16 is a stainless steel cap provided with a flange 16a at the opening end and formed in a bottomed cylindrical shape and provided with a hole 16b communicating with the outside, 9 is a valve body made of silicon rubber formed in a bottomed cylindrical shape, 10 is a packing made of butyl rubber, 11 is an aluminum ring-shaped washer provided with a hole 11a in the center and an annular wall 11b integrally formed on the periphery of the upper surface. The washer 11 is press-fitted into the cap 16 with the packing 10 and the valve body 9 placed on top of each other, thereby holding the valve body 9 and the packing 10 in a compressed state, thereby forming the valve unit 17. It is what.

  In addition, 16c is a cut-and-raised portion that is processed so that a cutout is provided in a part of the peripheral surface of the cap 16, and the cutout projects into the cap 16, and by providing the cut-and-raised portion 16c When the washer 11 is press-fitted into the cap 16, the cut-and-raised portion 16c provided in the stainless-made cap 16 bites into the aluminum washer 11, so that press-fitting with higher bonding strength can be performed.

  18 is an aluminum washer formed in a ring shape having a hole 18a in the center, and 14 is a circular gas permeable sheet made of a porous film made of PTFE. The gas permeable sheet 14 and the washer 18 are connected to each other. A film-like modified polypropylene (hereinafter referred to as a modified PP) 19 is bonded by heat fusion, thereby forming a circular filter holder 20, and this filter holder 20 is provided on the terminal plate 4. It is disposed above the hole 4b for electrolyte injection.

16A and 16B show a method of joining the washer 18 and the gas permeable sheet 14 using the modified PP 19, as shown before the thermocompression bonding in FIG. 16A. The film-like modified PP 19 is placed between the washer 18 and the gas permeable sheet 14 and stacked, heated at a temperature of 140 to 200 ° C. for about 10 seconds, and pressed at a pressure of 1 kgf / cm ² . As shown in FIG. 16 (b), the modified PP19 melted into the gas permeable sheet 14 is uniformly infiltrated, and joining by the anchor effect is performed.

  Reference numeral 21 denotes a cylindrical rubber made of butyl rubber having an inverted L-shaped cross section by providing a hole 21a in the center. The rubber 21 covers the filter holder 20 and covers the filter holder 20. The gas permeable sheet 14 bonded to the substrate is pressed.

  Then, the filter holder 20 configured as described above is disposed above the electrolyte solution injection hole 4 b provided in the terminal plate 4, and is covered with a pressing rubber 21 so as to cover the filter holder 20. The valve unit 17 is disposed, and the protrusion 4d provided on the terminal plate 4 is caulked to be pressed and mechanically coupled to the flange portion 16a provided at the opening end of the cap 16, whereby the presser The rubber 21 is held in a compressed state.

  And the pressure regulating valve 15 according to the present embodiment configured in this way, like the pressure regulating valve 6 described in the first embodiment, when the pressure inside the capacitor rises to become a predetermined pressure or higher, The gas permeable sheet 14 prevents permeation of the driving electrolyte and allows only gas to pass therethrough. Therefore, the gas whose pressure has increased pushes up the packing 10 and the valve body 9 and enters the cap 16 from the interface between the packing 10 and the washer 11. It will come out and be discharged to the outside through the hole 16b provided in the cap 16, and after operating in this way, it will return to the state before the operation and maintain the airtightness inside the capacitor. Self-returning type

  As a result, the assembly accuracy as the valve unit 17 can be greatly improved, so that not only the operation variation as the pressure regulating valve 15 can be reduced and stable performance can be exhibited, but also the valve unit 17. It is also possible to confirm the operation of the pressure regulating valve 15 as a single unit. Further, the valve body 9 is made of silicon rubber, and the valve body 9 is placed on the packing 10 made of butyl rubber. It has a special effect of being excellent in heat resistance.

(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 metal case used for the capacitor described in the first embodiment with reference to FIGS. 1 to 13 is partially different, and the other configurations are different from 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.

  17 is a cross-sectional view showing a configuration of a metal case used in the capacitor according to the third embodiment of the present invention. In FIG. 17, 5 is a metal case, and 22 is an inner periphery of the metal case 5 in the vicinity of the opening. The protective layer 22 is formed in a ring shape on the surface, and this protective layer 22 is formed by heat-sealing the modified PP, and is a sealing rubber 7 for sealing at least the opening of the metal case 5. It is made to provide in the contact part.

  In the capacitor according to the present embodiment configured as described above, the driving electrolyte is electrically insulated from the metal case 5 by the protective layer 22 made of the modified PP, whereby the driving electrolyte is electrolyzed. Since the deterioration of the sealing rubber 7 can be suppressed by suppressing alkalinization at the negative electrode, it is possible to eliminate the leakage of the driving electrolyte and to exhibit a higher reliability. It is what you play.

  The capacitor according to the present invention has an effect of improving reliability associated with connection for electrode lead-out, reducing operation variation of the pressure regulating valve and excellent in heat resistance, and is particularly suitable for automobiles that require high reliability. It is useful as a capacitor in the field.

Sectional drawing which showed the structure of the capacitor by Embodiment 1 of this invention Cross section of the main part showing the sealing part of the capacitor The perspective view which showed the state before joining a current collecting plate to the electrode of the both end surfaces of the element used for the capacitor Sectional drawing which showed the state which joined the current collector plate Sectional drawing which showed the state which joined the terminal plate to the anode current collecting plate of FIG. (A) The top view which showed the structure of the anode current collecting plate, (b) The front sectional view (A) The top view which showed the structure of the cathode current collecting plate, (b) The front sectional view (A) Plan view showing the configuration of the terminal board, (b) Front sectional view of the same (A) Plan view showing the configuration of the sealing rubber, (b) Front sectional view of the same Sectional view showing the configuration of the pressure regulating valve A sectional view showing the pressure regulating valve in an exploded manner Characteristic diagram showing changes in operating pressure during high temperature test of the same pressure regulating valve Characteristic diagram showing change in operating pressure maintenance ratio in high temperature test of the same pressure regulating valve Sectional drawing which showed the structure of the pressure regulation valve used for the capacitor by Embodiment 2 of this invention A sectional view showing the pressure regulating valve in an exploded manner (A), (b) Manufacturing process diagram showing a method of manufacturing a filter holder used for the same pressure regulating valve Sectional drawing which showed the structure of the metal case used for the capacitor by Embodiment 3 of this invention Sectional view showing the structure of a conventional capacitor Sectional drawing which showed the other structure of the conventional capacitor Sectional drawing which showed the structure of the pressure regulation valve provided in the capacitor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Element 1a Anode 1b Cathode 1c Hollow part 2 Anode current collecting plate 2a, 3a Convex part 2b, 3b, 8b, 11a, 13a, 16b, 18a, 21a Hole 3 Cathode current collecting plate 4 Terminal board 4a, 8a, 16a collar 4b Electrolyte injection hole 4c Recess 4d Protrusion 5 Metal case 5a Joint 5b Horizontal groove drawing part 5c Curling part 5d Flat part 6, 15 Pressure regulating valve 7 Sealing rubber 7a, 7b, 11b Wall part 8, 16 Cap 8c, 16c Cut-and-raised part 9 Valve body 10 Packing 11, 18 Washer 12, 17 Valve unit 13, 21 Holding rubber 14 Gas permeable sheet 19 Modified PP
20 Filter holder 22 Protective layer

Claims (8)

An element configured to take out positive and negative electrodes from both end faces, a current collecting plate processed from a single flat metal bonded to each electrode of the element, and the element together with a driving electrolyte and, and, joined to the bottom surface of one of the bottomed cylindrical metal case joined to the inner bottom surface of the bonded collector plate to the electrode, a current collector plate joined to the other electrode of the device element A terminal plate disposed in the opening of the metal case, a pressure regulating valve provided on the terminal plate, and disposed between the outer peripheral surface of the terminal plate and the inner peripheral surface of the metal case. while insulating consists annular sealing rubber to perform sealing is compressed by processing the metal casing, and a flange portion provided in the annular to the lower surface of the formed and sealed rubber to the lower end of the terminal plate, the upper Symbol the other electrode of the element joined to the lower surface of the current collector plate, the periphery of the upper surface of the current collecting plate Capacitor directly bonded by overlapping the lower surface of the flange portion of the serial terminal plate annularly. The annular sealing rubber for sealing the metal case is provided with at least one of an annular wall portion projecting at the outer peripheral portion at the lower end and an annular wall portion projecting at the inner peripheral portion at the upper end. Capacitor. A pressure regulating valve, which is connected so as to close the hole for electrolyte injection provided in the terminal board, has a butyl rubber packing and a silicon rubber valve body in a metal cap having a hole communicating with the outside. A valve unit that holds the packing and the valve body in a compressed state by press-fitting a ring washer into the opening of the cap, and a hole for electrolyte injection provided in the terminal plate The ring-shaped pressing rubber and gas permeable sheet disposed on the upper part are configured to hold the pressing rubber in a compressed state by coupling the valve unit to the terminal plate. The capacitor described. A pressure regulating valve, which is connected so as to close the hole for electrolyte injection provided in the terminal board, has a butyl rubber packing and a silicon rubber valve body in a metal cap having a hole communicating with the outside. A valve unit that holds the packing and the valve body in a compressed state by press-fitting a ring washer into the opening of the cap, and a gas permeable sheet joined to the ring washer A filter holder disposed above the hole for electrolyte injection provided in the terminal plate, and a pressing rubber that covers the filter holder and covers the gas permeable sheet. The capacitor according to claim 1, wherein the capacitor is configured to be held in a compressed state by being coupled to a terminal plate. The capacitor according to claim 3 or 4, 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 3 or 4, wherein a cut-and-raised portion that protrudes toward the inner surface is provided on at least a part of a peripheral surface of a metal cap that constitutes the valve unit of the pressure regulating valve. The capacitor according to claim 3 or 4, wherein a porous film made of PTFE (polytetrafluoroethylene) is used as the gas permeable sheet constituting the pressure regulating valve. The capacitor according to claim 1, wherein a protective layer made of a modified polypropylene is provided at least in contact with the sealing rubber on the inner peripheral surface of the metal case.

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