JP5482565B2 - Capacitor and manufacturing method thereof - Google Patents

Description

The present invention relates to a connection between a capacitor element and an external terminal, for example, a connection structure used for a capacitor such as an electrolytic capacitor and an electric double layer capacitor, and a method thereof.

  In an electric double layer capacitor or an electrolytic capacitor, it is necessary to electrically connect the element and an external terminal. By this electrical connection, measures are taken to reduce the internal resistance on the element side and the contact resistance of the connection portion.

Regarding such electrical connection, a current collecting terminal is provided on the end face of the element (for example, Patent Document 1), an anode current collecting plate is provided on one end face of the winding element, and a cathode current collecting plate is provided on the other end face. (For example, Patent Document 2), including a current collector foil that covers the current collector foil exposed on the end face of the winding element, and welding and connecting the current collector plate and the current collector foil (for example, Patent Document 3); It is known that a current collector plate is used for connection between an exterior case and an element or connection with an external terminal (for example, Patent Document 4).

Japanese Patent Laid-Open No. 11-21857 JP 2001-068379 A JP 2007-335156 A JP 2010-093178 A

  By the way, in the configuration in which the current collector is provided on each end face of the wound element, when external terminals on the anode side and the cathode side are installed adjacent to the exterior member that encloses the wound element, It is necessary to secure a connection distance between the electric body. Further, in the wound type element, the distribution of the internal resistance is different between the inner part and the outer part. Therefore, countermeasures are required, and attention must be paid to the connection between the element and the current collector. In addition, the structure using the current collector can reduce the internal resistance of the element, but depending on the stress applied during the manufacturing process to the current collector interposed between the external terminal and the element, the reliability of the connection is reduced and the connection resistance is large. There is a case.

  Regarding such demands and problems, Patent Documents 1 to 4 do not disclose or suggest them, and do not disclose or suggest a configuration for solving them.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to reduce the resistance of a capacitor and make the connection structure more robust, and to simplify the connection process.

In order to achieve the above object, a capacitor of the present invention includes a capacitor element in which an anode body and a cathode body are wound via a separator, a sealing member that seals a case member that accommodates the capacitor element, and the capacitor element. An anode part drawn from the anode body to the element end face and formed on the element end face; and a cathode part drawn from the cathode body of the capacitor element to the same element end face as the anode body, and formed on the element end face; An anode terminal member installed on the sealing member; a cathode terminal member installed on the sealing member; an anode current collector connected to the anode terminal member and connected to the anode terminal member; and comprising the a cathode terminal member connected to the cathode current collector plate is connected, the anode-side contact comprises a positive side connecting portion adjacent to the anode current collector plate to the outer wall of the anode terminal member And the anode current collector plate are connected by welding, and a cathode side connection portion adjacent to the cathode current collector plate is provided on an outer wall portion of the cathode terminal member, and the cathode side connection portion and the cathode current collector plate are It includes being connected by welding.

  In order to achieve the above object, in the capacitor, an insulating interval for insulating the anode part and the cathode part may be set on the same end face of the capacitor element.

  In order to achieve the above object, in the capacitor, the anode part or the cathode part is compression-molded on an element end surface toward a winding center part of the capacitor element, and is arranged at the compression-molded part. You may weld with an anode current collector plate or the said cathode current collector plate.

In order to achieve the above object, a method of manufacturing a capacitor according to the present invention includes a step of forming a capacitor element in which an anode body and a cathode body are wound through a separator, and the capacitor element is drawn out from the anode body and formed on the element end face. A step of forming an anode part, a step of drawing out from the cathode body of the capacitor element, forming a cathode part on the same element end face as the anode body, and a sealing member for sealing a case member containing the capacitor element A step of connecting an anode terminal member and the anode part via an anode current collector plate, and a step of connecting a cathode terminal member installed on the sealing member and the cathode part via a cathode current collector plate; An anode-side connection portion adjacent to the anode current collector plate on the outer wall portion of the anode terminal member, the anode-side connection portion and the anode current collector plate are connected by welding, and an outer side of the cathode terminal member Wherein the cathode-side connecting portion includes a cathode-side connecting portion close to the cathode current collector plate and the negative current collector plate includes connecting by welding separate component.

  In order to achieve the above object, in the method of manufacturing a capacitor, the step of connecting the anode current collector plate and the anode part or the cathode current collector plate and the cathode part by laser welding, and the anode current collector plate And the step of connecting the anode terminal member or the cathode current collector plate and the cathode terminal member by laser welding.

In order to achieve the above object, in the method for manufacturing a capacitor, a step of setting a connection portion close to the anode terminal member and the anode current collector and connecting them by laser welding, or the cathode terminal member A step of setting a connection portion close to the cathode current collector plate and connecting it by laser welding may be included.

  According to the capacitor of the present invention or the manufacturing method thereof, any one of the following effects can be obtained.

  (1) Since the anode part and the cathode part drawn out on the same end face of the wound capacitor element and the anode terminal member and the cathode terminal member in the exterior member are individually provided with a current collector plate and connected, the capacitor element The resistance can be reduced.

  (2) Since the anode part and the cathode part drawn to the same end face of the wound capacitor element and the anode terminal member and the cathode terminal member in the exterior member are individually connected with a current collector plate, The connection structure between the anode terminal member and the anode portion and between the cathode terminal member and the cathode portion can be strengthened.

  (3) With the structure described above, the connection between the anode terminal member and the anode part or the cathode terminal member and the cathode part can be simplified with the current collector plate interposed, and the connection process can be simplified.

Other objects, features, and advantages of the present invention will become clearer with reference to the accompanying drawings and each embodiment.

Is a cross sectional view showing an example of an electric double layer capacitor according to the first embodiment. It is an exploded perspective view showing an electric double layer capacitor. It is a perspective view which shows an example of the capacitor | condenser element which decomposed | disassembled one part. It is a figure which shows the example of arrangement | positioning of the current collection board on a capacitor | condenser element. It is a figure which shows a current collecting plate and a capacitor | condenser element. It is a flowchart which shows an example of the manufacturing process of the electrical double layer capacitor which concerns on 2nd Embodiment. It is a figure which shows the connection process of a capacitor | condenser element and a current collecting plate. It is a diagram showing a connection process of the external terminal and the current collector plate. It is a figure which shows the connection state of a capacitor | condenser element, a current collection board, and an external terminal. It is a figure which shows an example of the electric double layer capacitor which concerns on 3rd Embodiment. It is a figure which shows an example of the electrical double layer capacitor which concerns on 4th Embodiment. It is a figure which shows the connection structure of a capacitor | condenser element. It is a figure which shows an example of the anode part of the capacitor | condenser element which concerns on other embodiment, a cathode part, and a current collecting plate.

[First Embodiment]

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a longitudinal section showing an example of an electric double layer capacitor, and FIG. 2 shows an example of an exploded electric double layer capacitor.

  The electric double layer capacitor 2 is an example of the capacitor of the present invention and a method for manufacturing the same. As shown in FIG. 1, the electric double layer capacitor 2 includes an anode portion 6 on the same element end face of the capacitor element 4. And a cathode portion 8 are formed. An anode terminal 10 is connected to the anode portion 6 via an anode current collector plate 12, and a cathode terminal 14 is connected to the cathode portion 8 via a cathode current collector plate 16. For example, laser welding or electron beam welding is used for these connections, and 18 is an example of a welded connection portion. The anode terminal 10 and the cathode terminal 14 are terminal members for external connection. The anode terminal 10 is an example of an anode terminal member, and the cathode terminal 14 is an example of a cathode terminal member.

  Capacitor element 4 is a cylindrical body. From one element end face, anode body 60 (FIG. 3) is pulled out to form anode portion 6, and cathode body 80 (FIG. 3) is pulled out to form cathode portion 8. Yes. The holding tape 19 is wound around the capacitor element 4 to prevent the anode body 60 and the cathode body 80 from being unwound.

  An exterior case 20 and a sealing plate 22 are provided as exterior members of the capacitor element 4, and the exterior case 20 is a molded body made of a metal material having moldability such as aluminum. The sealing plate 22 is a means for closing the opening of the outer case 20 and maintaining the airtightness of the space 24, and is a fixing member for fixing the anode terminal 10 and the cathode terminal 14, and serves as a support member for the capacitor element 4. Configure. In this embodiment, the sealing plate 22 is provided with a base portion 26 and a sealing portion 28. The base portion 26 is formed of an insulating material, for example, synthetic resin, and the anode terminal 10 and the cathode terminal 14 are fixed and insulated. The sealing portion 28 is made of a material having high airtightness, for example, a rubber ring.

  The sealing plate 22 is inserted into the opening 30 (FIG. 2) of the exterior case 20 and is positioned at a caulking step 32 formed in the middle part on the opening 30 side. The open end 34 of the outer case 20 is crimped by a curling process and is bitten into the sealing portion 28. Thereby, the outer case 20 is firmly sealed. As shown in FIG. 2, the base portion 26 of the sealing plate 22 is formed with a through hole 36 and a pressure release mechanism 38 made of thin rubber.

  Next, the capacitor element 4 is referred to FIG. FIG. 3 shows a capacitor element partially disassembled.

  As shown in FIG. 3, the capacitor element 4 includes an anode body 60, a cathode body 80, and separators 40 and 42, and a separator 40 that insulates between the anode body 60 and the cathode body 80. , 42 are sandwiched and wound to form a cylindrical winding element. For example, an aluminum foil is used as a base material for the anode body 60 and the cathode body 80, and polarizable electrodes including an active material such as activated carbon, a binder, and the like are formed on both surfaces of the aluminum foil.

  In the capacitor element 4, an insulating interval 44 having a constant width is provided between the anode portion 6 and the cathode portion 8 formed on the same end face side. The anode portion 6 is formed of, for example, a base material of the anode body 60, and similarly, the cathode portion 8 is also formed of a base material of the cathode body 80. In the case where the anode body 60 and the cathode body 80 are formed of aluminum, the anode section 6 and the cathode section 8 are base material sections that expose an aluminum surface on which a polarizable electrode is not formed.

  The formation part of the anode part 6 or the cathode part 8 is set to be larger than the width W of the separators 40 and 42 which are insulating means, and is formed to a length L corresponding to the arc length of each anode part 6 or cathode part 8. .

  The anode portion 6 or the cathode portion 8 of the capacitor element 4 is processed into a capacitor as shown in FIG. 2 (or B in FIG. 5) before being connected to the anode current collector plate 12 or the cathode current collector plate 16. It is formed in close contact with the element end face of the element 4.

  Next, the anode current collector plate 12, the cathode current collector plate 16, the anode portion 6 and the cathode portion 8 of the capacitor element 4 will be described with reference to FIGS. FIG. 4 shows the arrangement of the anode current collector plate and the cathode current collector plate on the element end face of the capacitor element, and FIG. 5 shows an example of the form of the anode current collector plate, the cathode current collector plate, the anode portion, and the cathode portion. .

  As shown in FIG. 4, the anode current collector plate 12 and the cathode current collector plate 16 are arranged on one end face of the capacitor element 4, and are provided with an interval 46 corresponding to the insulation interval 44 between the anode portion 6 and the cathode portion 8. Arranged.

  As shown in FIG. 5A, the anode current collector plate 12 and the cathode current collector plate 16 have a semicircular shape that bisects the element end face of the capacitor element 4, and each of the anode current collector plate 12 and the cathode current collector plate 16 is illustrated. A terminal connecting portion 48 is formed on the middle upper side, and an element connecting portion 50 for connecting the anode portion 6 or the cathode portion 8 is formed on the back side thereof. The element connection portion 50 is a flat surface, and a plurality of groove portions 52 are formed radially from the center. Each groove 52 forms a space for accommodating the protrusion 54 in the anode 6 or the cathode 8.

  Each protrusion 54 is a linear protrusion generated by the overlap of each anode 6 or cathode 8 at the cut when the anode 6 or the cathode 8 of the capacitor element 4 is cut and compression molded. It is. The anode part 6 and the cathode part 8 of the capacitor element 4 can suppress the height dimension by compression-molding the anode part 6 and the cathode part 8 as a whole toward the center of the capacitor element 4 in this way. In this embodiment, the anode portion 6 and the cathode portion 8 are compression-molded from the center portion divided into three parts by cutting, and the rear end side is sequentially compression-molded, thereby causing linear protrusions generated by overlapping. The height dimension of the part 54 is suppressed. And since each protrusion 54 is accommodated in the groove part 52 formed in the element connection part 50 of the anode current collecting plate 12 or the cathode current collecting plate 16, the element connection part 50 has the anode part 6 or the cathode part 8 in it. Can be welded together, and both can be welded together and electrically connected.

When each connection between the anode part 6 and the anode current collector plate 12 or between the cathode part 8 and the cathode current collector plate 16 is described in detail, the anode current collector plate 12 and the cathode current collector plate 16 are compressed as shown in FIG. It arrange | positions at the shape | molded anode part 6 and the cathode part 8, and as shown in FIG. As described above, the groove 52 of the anode current collector plate 12 or the cathode current collector plate 16 is accommodated each butt strip portion 54 of the anode 6 and the cathode 8 are in close contact element connecting part 50. In this state, the element connection portion 50, the anode portion 6, and the cathode portion 8 are melted and connected by irradiating laser from the upper surface side corresponding to the element connection portion 50 of the anode current collector plate 12 or the cathode current collector plate 16. To do.

  In this embodiment, the laser irradiation sites are two locations on each of the element connecting portions 50 on both end sides separated from the groove portions 52 of the anode current collector plate 12 and the cathode current collector plate 16 as shown in FIG. 59 is a laser irradiation connection part. In this case, the laser irradiation is performed as indicated by arrows (1), (2), (3) and (4) attached to the laser irradiation connection portion 59 in FIG.

  (1) Irradiate one current collecting plate 12 linearly from the outer peripheral side of the capacitor element 4 toward the element center,

  (2) Next, the other current collector plate 16 opposed across the element center is welded in a series of operations by laser irradiation linearly from the element center side toward the element outer peripheral side.

  Similarly, laser irradiation

  (3) Irradiate one current collecting plate 12 linearly from the outer peripheral side of the capacitor element 4 toward the element center,

  (4) The other current collecting plate 16 facing the element center is welded by a series of operations in which a laser is irradiated linearly from the element center side toward the element outer peripheral side.

  In this way, the anode section 6 and the anode current collector plate 12, and the cathode section 8 and the cathode current collector plate 16 are connected by a series of operations in which laser irradiation is performed linearly across the element center. The series of operations (1) and (2) of laser irradiation is repeated twice. Alternatively, it is possible to further reduce the connection resistance by repeating the series of operations (1) to (4) of laser irradiation twice and arranging a weld in the vicinity. Although it is possible to connect by a series of operations (1) and (2) of laser irradiation, each element connecting portion 50 of the anode current collector plate 12 and the cathode current collector plate 16 is connected to the element center side from the element center side. It is also possible to connect individually such as irradiating on the straight line toward the outer peripheral side.

  Also, in the continuous operation of laser irradiation (1) to (4), laser welding is performed in (1) to (4) instead of continuously irradiating the same part with laser, and then again from (1) to (1). If the laser irradiation is performed in (4), a time interval can be provided for laser irradiation at the same location, and as a result, the laser irradiation location can be cooled and the connection by laser welding can be stabilized. It is also possible to perform multiple laser irradiations at the same location with a time interval, but the first laser welding is performed from (1) to (4), and laser welding is again performed from (1) to (4 Therefore, laser irradiation can be continuously performed while taking a cooling interval, and the laser irradiation welding time can be shortened.

  Here, as shown in FIG. 5, the anode portion 6 and the cathode portion 8 are led out from the end face of the capacitor element 4 with a predetermined insulation interval 44. The anode portion 6 and the cathode portion 8 have an insulating interval 44 at which the anode portion 6 and the cathode portion 8 do not come into contact with each other when compression-molded toward the center direction. Then, the anode part 6 and the cathode part 8 are not formed. Moreover, since the anode part 6 and the cathode part 8 lead to a reduction in resistance as the number of formation sites (or the area increases), the anode part 6 and the cathode part 8 do not come into contact with each other and the resistance is reduced. For example, 3 [mm] to 10 [mm] is set as the insulating interval 44 that can be achieved. In addition, at the outermost periphery of the capacitor element 4, the anode current collector plate 12 and the anode current collector plate 12 are arranged so that the anode 6 and the cathode 8 do not contact the outer case 20 even if a displacement occurs during compression molding of the anode 6 and the cathode 8. An insulating means such as an insulating tape may be provided on the outer peripheral surface of the connected anode portion 6 and the cathode current collector plate 16 connected to the cathode current collector 16.

In this embodiment, a flat connection surface portion 55 for laser welding is formed on the outer wall portions of the anode terminal 10 and the cathode terminal 14, and flat connection is also made to the anode current collector plate 12 and the cathode current collector plate 16. The surface portion 57 is formed by a notch. These flat connection surface portions 55 and 57 constitute a coincident surface portion, and a laser is irradiated near the boundary to weld the flat connection surface portions 5 5 and 57 to form a weld connection portion 18 as shown in FIG. Become. Here, there is only a small space between the capacitor element 4 and the sealing plate 22. That is, if the distance (distance) between the capacitor element 4 and the sealing plate 22 is increased, the resistance increases and the height dimension of the electric double layer capacitor 2 increases. The distance (distance) from the plate 22 is made as short as possible. In such a small space, in order to connect the anode terminal 10 and the cathode terminal 14 to the anode current collector plate 12 and the cathode current collector plate 16, as described above, the flat connection surface portions 55 and 57 are made to coincide with each other. The welding is simplified and strengthened by welding with a laser that can be locally welded to this part. Here, the thicknesses of the anode current collector plate 12, the cathode current collector plate 16, the anode terminal 10 and the cathode terminal 14 (height dimensions of the flat connection surface portions 55 and 57) are dimensions capable of laser welding and increase in internal resistance. In order to shorten the height dimension of the electric double layer capacitor 2, it is set in the range of 0.5 [mm] to 5 [mm], respectively.

  In addition, although the flat connection surface parts 55 and 57 are comprised as a plane by a notch, it is not restricted to this, A curved surface may be sufficient and what is necessary is just to be the surface part which corresponded. Further, the flat connection surface portions 55 and 57 are preferably disposed in the vicinity of the outer peripheral surface of the capacitor element 4 in order to prevent excessive stress on other members (the anode portion 6 and the cathode portion 8) during laser irradiation. Specifically, it is preferable that the outer peripheral surface of the capacitor element 4 is, for example, within 10 [mm].

  As described above, the connection portions of the anode portion 6 and the cathode portion 8 of the capacitor element 4 with the anode current collector plate 12 and the cathode current collector plate 16, the anode terminal 10, the cathode terminal 14, the anode current collector plate 12, and the cathode current collector. By separately setting the connection portion with the plate 16, the stability of the connection during laser welding is improved.

  The features and advantages of the electric double layer capacitor 2 of the first embodiment described above are listed as follows.

  (1) On one end surface side of the capacitor element 4, the anode portion 6 is formed of the base material of the anode body 60, the cathode portion 8 is formed of the base material of the cathode body 80, and the anode portion 6 and the anode terminal 10 are connected to the anode current collector plate 12. Since the cathode part 8 and the cathode terminal 14 are connected via the cathode current collector plate 16, the terminal connection is simplified. In addition, the connection can be facilitated.

  (2) The space occupation rate occupied by the connecting portion in the space 24 of the outer case 20 is extremely low.

  (3) The capacitor element 4 is firmly supported by the sealing plate 22 which is an exterior member. That is, the capacitor element 4 is firmly fixed to the anode terminal 10 and the cathode terminal 14 by laser welding of the anode portion 6 and the cathode portion 8 of the capacitor element 4 via the anode current collector plate 12 and the cathode current collector plate 16. The support strength of is increased. As a result, a mechanically robust support structure is formed, and the seismic resistance of the product can be improved.

  (4) A plurality of side edge portions are assembled from the anode body 60 wound around the capacitor element 4 as a winding element to form the anode portion 6, and this anode portion 6 is laser welded to the anode current collector plate 12. Similarly, a plurality of side edge portions are assembled from the cathode body 80 to form the cathode portion 8, and the cathode portion 8 is laser welded to the cathode current collector plate 16. The resistance of the capacitor 2 can be reduced, and a product with a low equivalent series resistance can be provided.

  (5) Since the anode current collecting plate 12 and the cathode current collecting plate 16 are used, it is not necessary to connect a tab to the capacitor element 4.

[Second Embodiment]

  Next, FIG. 6 is referred about the 2nd Embodiment of this invention. FIG. 6 is a flowchart showing an example of the manufacturing process of the electric double layer capacitor according to the second embodiment.

  This manufacturing process is an example of a method for manufacturing a capacitor according to the present invention. As shown in FIG. 6, the capacitor element 4 is formed (step S11), and the anode portion 6 and the cathode portion 8 of the capacitor element 4 are formed as shown in FIG. As shown in B of FIG.

  As shown in FIG. 7A, the anode current collecting plate 12 is inserted into the anode portion 6 of the capacitor element 4, the cathode current collecting plate 16 is inserted into the cathode portion 8 of the capacitor element 4, and the protrusion 54 is inserted into each groove portion 52. Then, the anode current collector 12 is connected to the anode 6 and the cathode current collector 16 is connected to the cathode 8 by laser welding (step S13). In FIG. 7B, reference numeral 56 denotes a weld connection portion by laser welding similar to the weld connection portion 18 described above.

  The anode terminal 10 on the sealing plate 22 is connected to the anode current collector plate 12 connected to the anode portion 6 by laser welding with the flat connection surface portions 55 and 57 (FIG. 4) matched, and similarly to the cathode portion 8. The cathode terminal 14 of the sealing plate 22 is connected to the connected cathode current collector plate 16 by laser welding (step S14).

  In this embodiment, as shown in FIG. 8, the anode terminal 10 of the sealing plate 22 is positioned with respect to the anode current collector plate 12 connected to the anode portion 6 of the capacitor element 4, and at the same time, the cathode portion of the capacitor element 4. By positioning the cathode terminal 14 of the sealing plate 22 with respect to the cathode current collector plate 16 connected to 8, the laser welding is performed as shown in FIG. Reference numerals 18 and 56 are the weld connection portions described above.

  The sealing plate 22 is formed of synthetic resin (insert molding) using inserts of the anode terminal 10 and the cathode terminal 14, whereby the base portion 26 and the sealing portion 28 are formed.

  The capacitor element 4 is impregnated with the electrolytic solution, and then accommodated in the outer case 20 and sealed by curling the open end 34 of the outer case 20 (step S15). Complete.

  According to such a manufacturing process, the electric double layer capacitor 2 described above can be easily manufactured, and the terminal connection process can be simplified.

[Third Embodiment]

  The third embodiment of the present invention will be described with reference to FIG. FIG. 10 is a flowchart showing an example of the manufacturing process of the capacitor according to the third embodiment.

  This manufacturing process is an example of a method for manufacturing a capacitor according to the present invention. As shown in FIG. 10, the capacitor element 4 is formed (step S21), and the anode portion 6 and the cathode portion 8 of the capacitor element 4 are formed. (Step S22).

  In this embodiment, the anode terminal 10 of the sealing plate 22 and the anode current collector plate 12 are connected by laser welding. Further, the cathode terminal 14 of the sealing plate 22 and the cathode current collector plate 16 are connected by laser welding with the flat connection surface portions 55 and 57 being matched (step S23).

  Further, the anode portion 6 of the capacitor element is positioned on the anode current collector plate 12, and similarly, the cathode portion 8 of the capacitor element 4 is positioned on the cathode current collector plate 16, and these are connected by laser welding (step S24).

  The anode current collecting plate 12 is connected to the anode terminal 10 on the sealing plate 22 and the cathode current collecting plate 16 is first connected to the cathode terminal 14 and integrated with the sealing plate 22, and then the anode current collecting plate 12 is connected to the anode of the capacitor element 4. The cathode current collector plate 16 is positioned in the portion 6 on the cathode portion 8 of the capacitor element 4, and laser welding is performed.

  The capacitor element 4 is impregnated with the electrolytic solution, and then accommodated in the outer case 20 and sealed by curling the open end 34 of the outer case 20 (step S25), thereby completing the electric double layer capacitor 2.

  According to such a configuration, the anode current collector plate 12 and the cathode current collector plate 16 can be integrated with the sealing plate 22, and the connection and positioning on the capacitor element 4 side can be facilitated.

[Fourth Embodiment]

  A fourth embodiment of the present invention will be described with reference to FIGS. FIG. 11 shows an electric double layer capacitor according to the fourth embodiment, and FIG. 12 shows a connection structure of capacitor elements.

  In the fourth embodiment, as shown in FIG. 11, an anode terminal plate 62 is provided together with the anode terminal 10 as an anode terminal member, and a cathode connection plate 64 is provided together with the cathode terminal 14 as a cathode terminal member. The anode connecting plate 62 is connected to the anode terminal 10 by laser welding and then connected to the anode current collecting plate 12 on the capacitor element 4 side. Similarly, the cathode connection plate 64 is connected to the cathode terminal 14 by laser welding and then connected to the cathode current collector plate 16 on the capacitor element 4 side. The anode connection plate 62 is formed with a connection recess 66 for positioning and connecting the anode terminal 10, and the cathode connection plate 64 is formed with a connection recess 68 for positioning and connecting the cathode terminal 14.

  In such a configuration using the anode connection plate 62 and the cathode connection plate 64, as shown in FIG. 12, the anode terminal 10 and the cathode terminal 14 which are external terminals and the anode current collector plate connected to the capacitor element 4 side. 12, the connection with the cathode current collector plate 16 is performed over a wide range, the connection resistance can be reduced, and the connection strength can be increased.

[Other Embodiments]

  (1) In the above embodiment, the flat element connecting portion 50 is formed on the anode current collecting plate 12 and the cathode current collecting plate 16, but as shown in FIG. You may provide the protrusion surface part 70 with the flat surface which protrudes in the range, and the concave surface part 72 which went back on both sides of this protrusion surface part 70.

  Further, as shown in FIG. 13B, the end face on the side of the capacitor element 4 is protruded with the recess 74 recessed in the anode portion 6 and the cathode portion 8 within a range of 60 degrees, for example, and the recess 74 interposed therebetween. The protrusion 74 may be set to a portion where the cathode portion or the anode portion is not formed, and the protrusion 76 may be set to a portion that is compression-molded toward the center direction of the capacitor element 4. The protrusion 76 is compression-molded toward the center direction of the capacitor element 4 as shown in FIG. And like the said embodiment, you may connect the anode part 6 and the anode current collecting plate 12, and the cathode 8 and the cathode current collecting plate 16 by laser welding, and unite them.

  (2) The anode portion 6 and the cathode portion 8 are flattened by being compressed from the capacitor element 4 by protruding only from the portions corresponding to the laser welded portions (welded connection portions 56) with the current collectors 12 and 16. In addition, the anode portion 6 and the cathode portion 8 may not be formed in the portion of the capacitor element 4 corresponding to the connection portion with the external terminal (the anode terminal 10 or the cathode terminal 14). In the first embodiment, as shown in FIG. 5, the entire surface of the anode portion 6 and the cathode portion 8 is compression-molded, but a current collector plate connected to an external terminal (the anode terminal 10 or the cathode terminal 14) ( The anode current collecting plate 12 or the cathode current collecting plate 16) makes the current collecting plate and the external terminal contact with each other without any gap, and does not perform laser welding of the anode portion 6, the cathode portion 8 and the current collecting plates 12 and 16. A site may be interposed.

  (3) In the above embodiment, the electric double layer capacitor 2 is exemplified, but the present invention is not limited to this. The same structure and method can be similarly applied to an electrolytic capacitor, and the same effect can be obtained.

  (4) Although the anode terminal 10 and the cathode terminal 14 are illustrated as terminal members in the first embodiment, the present invention is not limited to this. As illustrated in the fourth embodiment, the anode connection plate 62 may be used for the anode terminal 10 and the cathode connection plate 64 may be used for the cathode terminal 14.

As described above, the most preferable embodiment and the like of the present invention have been described. However, the present invention is not limited to the above description, and is described in the claims or a form for carrying out the invention. It goes without saying that various modifications and changes can be made by those skilled in the art based on the gist of the invention disclosed in the above, and such modifications and changes are included in the scope of the present invention.

The capacitor and the method for manufacturing the same according to the present invention contribute to simplification of the terminal connection structure and the connection process, and can increase productivity and reliability, which is beneficial.

2 Electric double layer capacitor 4 Capacitor element 6 Anode portion 60 Anode body 8 Cathode portion 80 Cathode body 10 Anode terminal 12 Anode current collector plate 14 Cathode terminal 16 Cathode current collector plate 18, 56 Weld connection portion 19 Holding tape 20 Exterior case 22 Sealing Plate 24 Space portion 26 Base portion 28 Sealing portion 32 Caulking step portion 34 Open end portion 36 Through hole 38 Pressure release mechanism 44 Insulation interval 46 interval 48 Terminal connection portion 50 Element connection portion 55 Flat connection surface portion 57 Flat connection surface portion

Claims (6)

A capacitor element in which an anode body and a cathode body are wound through a separator;
A sealing member that seals the case member that houses the capacitor element;
An anode part drawn from the anode body of the capacitor element to the element end face, and formed on the element end face;
A cathode portion that is drawn from the cathode body of the capacitor element to the same element end face as the anode body, and formed on the element end face;
An anode terminal member installed in the sealing member;
A cathode terminal member installed in the sealing member;
An anode current collector connected to the anode part and connected to the anode terminal member;
A cathode current collector connected to the cathode portion and connected to the cathode terminal member;
Equipped with a,
The anode side connecting portion and the anode current collecting plate are connected by welding to the outer wall portion of the anode terminal member provided with an anode side connecting portion adjacent to the anode current collecting plate,
A capacitor comprising a cathode side connection portion adjacent to the cathode current collector plate on an outer wall portion of the cathode terminal member, wherein the cathode side connection portion and the cathode current collector plate are connected by welding .   The capacitor according to claim 1, wherein an insulation interval for insulating the anode part and the cathode part is set on the same end face of the capacitor element.   The anode part or the cathode part is compression-molded on the element end surface toward the winding center part of the capacitor element, and is welded to the anode current collector plate or the cathode current collector plate arranged in the compression molding part. The capacitor according to claim 1. Forming a capacitor element in which an anode body and a cathode body are wound via a separator;
Drawing out from the anode body of the capacitor element, forming an anode part on the element end face,
Extracting from the cathode body of the capacitor element and forming a cathode portion on the same element end face as the anode body;
A step of connecting the anode terminal member installed on the sealing member for sealing the case member containing the capacitor element and the anode part with an anode current collector interposed therebetween;
Connecting the cathode terminal member installed in the sealing member and the cathode portion with a cathode current collector plate interposed therebetween;
An anode side connection portion adjacent to the anode current collector plate on the outer wall portion of the anode terminal member, the anode side connection portion and the anode current collector plate are connected by welding,
A capacitor comprising: a cathode side connection portion adjacent to the cathode current collector plate on an outer wall portion of the cathode terminal member, wherein the cathode side connection portion and the cathode current collector plate are connected by welding . Production method. Connecting the anode current collector plate and the anode part or the cathode current collector plate and the cathode part by laser welding;
Connecting the anode current collector plate and the anode terminal member, or connecting the cathode current collector plate and the cathode terminal member by laser welding;
The method of manufacturing a capacitor according to claim 4 , comprising: The step of connecting the anode side connection portion adjacent to the anode terminal member and the anode current collector plate by laser welding, the cathode side connection portion adjacent to the cathode terminal member and the cathode current collector plate by laser welding. The method for manufacturing a capacitor according to claim 4 , further comprising a connecting step.

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