JP5764912B2 - Capacitor and manufacturing method thereof - Google Patents

Description

The present invention relates to a connection between a capacitor element and an external terminal in a sealing member that seals an exterior member of the capacitor element. For example, a capacitor such as an electrolytic capacitor or an electric double layer capacitor using laser welding for the connection, and It relates to the manufacturing method.

  In the electric double layer capacitor or electrolytic capacitor, it is necessary to electrically connect the capacitor element and the 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).

In addition, a multilayer capacitor element having a connection terminal on the element end face side is known (for example, Patent Document 5).

Japanese Patent Laid-Open No. 11-21857 JP 2001-068379 A JP 2007-335156 A JP 2010-093178 A JP-A-6-275476

Incidentally, winding in a configuration having a current collector plate to the end faces of the Kaimoto child, when the anode side and adjacent the external terminals of the cathode-side set up a wound element exterior member to the exterior, each external terminal and the current It is necessary to secure a connection distance between the electric plate. Further, in the winding Kaimoto child, since the distribution of the internal resistance is different between the inner and outer portions, a countermeasure is required, it is necessary to pay attention to the connection between the element and the collector plate. In addition, the structure using the current collector plate can reduce the internal resistance of the element, but depending on the stress applied to the current collector plate interposed between the external terminal and the element during manufacturing, the reliability of the connection is reduced and the connection resistance is large. There is a case.

  Regarding such connection, there is a slight space between the capacitor element and the sealing member, but when this space is increased and the interval required for the connection member and connection is increased, the resistance is increased accordingly. Furthermore, the height dimension of the capacitor increases. If this distance (distance) is shortened, the size of the capacitor can be reduced by reducing the space, but the connection interval between the capacitor element and the sealing member is shortened, and it takes time to connect or incomplete connection. There are challenges.

  Regarding such demands and problems, Patent Documents 1 to 5 do not disclose or suggest them, and do not disclose or suggest a configuration for solving them.

In view of the above problems, an object of the present invention is to reduce the resistance of the capacitor, simplify and strengthen the connection structure, and facilitate connection.

In order to achieve the above object, a capacitor according to the present invention includes a capacitor element that is a winding element or a non-winding element including an electrode body on the anode side and a cathode side, and a separator interposed between the electrode bodies, and the capacitor A sealing member that seals an opening of a case member that accommodates the element; a single or a plurality of electrode extending portions drawn from one or both of the electrode bodies on the element end surface of the capacitor element; and the electrode extending portion A single or a plurality of current collector plates connected to each other, and a terminal member that is installed on the sealing member, overlapped with the current collector plate, and has a side surface welded to a side surface portion of the current collector plate , The side surface portion of the terminal member forms a common surface portion with the side surface portion of the current collector plate .

  In order to achieve the above object, in the capacitor, the welding may be laser welding or electron beam welding.

  In order to achieve the above object, in the capacitor, the electrode extension portion is an aggregate formed by a part of the electrode body, and is formed on the element end surface toward the element center of the capacitor element. It may be bent and joined to the current collector plate.

  In order to achieve the above object, in the capacitor, the electrode extension portion includes an anode extension portion drawn from the electrode body on the anode side of the capacitor element to an element end surface, and the electrode body on the cathode side of the capacitor element. One or both of the cathode extended portions drawn out from the same element end face as the element end face or a different element end face may be used.

  In order to achieve the above object, in the capacitor, when the anode overhanging portion and the cathode overhanging portion are disposed on the common element end face of the capacitor element, the capacitor is provided between the anode overhanging portion and the cathode overhanging portion. May be insulated by an insulating interval or by installing an insulating member.

  In order to achieve the above object, in the capacitor, the current collector plate is a single or a plurality of electrode extension portions formed on a part or all of the single or a plurality of electrode extension portions drawn on the element end face of the capacitor element. A single or a plurality of first welding surface portions to be welded to the plurality of welding surface portions; and a second welding surface portion provided on a side surface portion intersecting with the first welding surface portion and welded to the terminal member. May be.

  In order to achieve the above object, in the capacitor, the electrode overhanging portion is partitioned at a predetermined angle with respect to the element central portion of the element end face, and in the center direction of the element end face with the same or different bending angle. You may provide the some division part bent and the single or several welding surface part formed with the said division part on the said element end surface.

To achieve the above objects, in the capacitor, the the collector plate, a recess formed is retracted toward the center of the capacitor element end faces of the outer peripheral portion of the capacitor element was welded to the terminal member said You may provide the flat part which protrudes in the outer peripheral direction of the said capacitor | condenser element from a recessed part.

In order to achieve the above object, a method for manufacturing a capacitor according to the present invention includes a capacitor element that is a wound element or a non-winding element including anode-side and cathode-side electrode bodies and a separator interposed between the electrode bodies. A step of forming the electrode body on the element end face and forming a single or a plurality of electrode projecting portions on the element end face; and a terminal member installed on the sealing member for sealing the opening of the case member for housing the capacitor element When the overlapped and single or multiple collector plates are connected to the electrode extending portion, seen including a step of welding the side portions and the side surface portion of the collector plate of the terminal member, the terminal member The side surface portion of the current collector plate is positioned on the side surface portion, and the welding is performed with the space between the side surface portions as a common surface portion .

  In order to achieve the above object, in the method for manufacturing a capacitor, the welding may be laser welding or electron beam welding.

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

  (1) A current collector plate connected to one or a plurality of electrode extending portions drawn from one or both of the electrode body on the anode side or cathode side of the capacitor element to the element end face, and a terminal member on the exterior member , And welded between the side parts, the space for the connection can be narrowed, and the resistance of the capacitor element can be reduced with enhanced connection and improved connection reliability. Low ESR can be achieved.

  (2) Since local welding uses laser welding or electron beam welding, welding can be performed with high precision even if the space for connection is small.

  (3) Since the current collector plate is connected to the electrode extension portion that is extended to the same or different element end faces of the capacitor element, each of the anode side electrode bodies is connected by the current collector plate or the cathode side electrode body Since each is connected by the current collecting plate, the resistance of the capacitor element can be reduced.

  (4) Since the current collector plate is interposed between the electrode overhanging portion projecting from the electrode body of the capacitor element and the terminal member on the sealing member side, the connection structure is simplified and the connection structure Solidification can be achieved.

  (5) With the above structure, the current collector plate can be interposed to facilitate the connection between the terminal member and the terminal member, the connection process can be simplified, the connection process can be performed in a short time, and the manufacturing cost can be reduced. Can be planned.

  (6) Since the side surfaces of the current collector plates and the external terminals are flush with each other, it is possible to stabilize the laser irradiation on both, and to improve the completeness and reliability of the connection.

  (7) Positioning means is provided on any of the sealing plate, external terminal, or current collector plate, and the connection position between the external terminal and current collector plate can be determined by the positioning means, and the laser irradiation surface is made uniform. It is possible to stabilize the connection and realize a highly reliable connection.

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

It is sectional drawing which shows an example of the electric double layer capacitor which concerns on 1st Embodiment. It is a disassembled perspective view which shows each member of 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 an example before and behind shaping | molding of the electrode part of a capacitor | condenser element. It is a figure which shows an example of a current collecting plate. It is a figure which shows a capacitor | condenser element provided with the current collector plate welded by laser. It is a figure which shows the connection of the current collection board on a capacitor | condenser element, and an external terminal. 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 molding state of the anode part and cathode part of a capacitor | condenser element. It is a figure which shows the connection process of a capacitor | condenser element and a current collecting plate. It is a figure which shows the connection of the current collection board which concerns on 3rd Embodiment, and an external terminal. It is a figure which shows the current collection board which concerns on 4th Embodiment, and its connection. It is a figure which shows the connection and positioning of the current collecting plate and external terminal which concern on 5th Embodiment. It is a disassembled perspective view which shows other embodiment of an electric double layer capacitor provided with a terminal connection board.

[First Embodiment]

  In the first embodiment, an external terminal is connected to a current collector plate connected to an element end face of a capacitor element, and the external terminal is formed in the capacitor element.

  The first embodiment will be described with reference to FIG. 1 and FIG. FIG. 1 shows a longitudinal section showing an example of an electric double layer capacitor, and FIG. 2 shows an example of an electric double layer capacitor partially disassembled.

  The electric double layer capacitor 2 is an example of the capacitor of the present invention. As shown in FIG. 1, the electric double layer capacitor 2 has an anode portion 6 and a cathode portion 8 formed on the same element end face of the capacitor element 4. The anode part 6 and the cathode part 8 are an example of an electrode extension part, and are constituted by a part of an electrode body (anode body 60 or cathode body 80: FIG. 3) drawn from the element end face of the capacitor element 4. An anode current collector plate 12 interposed between the anode part 6 and the anode terminal 10 is used for the connection between the anode part 6 and the anode terminal 10, and a cathode current collector interposed between the two for the connection between the cathode part 8 and the cathode terminal 14. A plate 16 is used. For these connections, for example, laser welding or electron beam welding is used, and 18 is an example of a weld connection. 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. In this embodiment, insulating means 17 is provided on the outer peripheral surface of the anode portion 6 connected to the anode current collector plate 12 and the cathode portion 8 connected to the cathode current collector plate 16. The insulation means 17 insulates the capacitor element 2 from the outer case 20. The insulating means 17 may be made of an insulating material such as insulating paper or insulating tape.

  Capacitor element 4 is a cylindrical body, and anode body 60 (FIGS. 3 and 4) is drawn out on one element end face to form anode section 6, and cathode body 80 (FIG. 3) is pulled out to form a cathode section. 8 is formed. A holding tape 19 is wound around the capacitor element 4 to prevent the anode body 60 and the cathode body 80 from unwinding.

  An exterior case 20 and a sealing plate 22 are provided as exterior members of the capacitor element 4. The outer case 20 is a molded body made of a moldable metal material 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. It is composed. 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 of the outer case 20 and is positioned at a caulking step 32 formed in the middle of the opening 30. The open end 34 of the outer case 20 is crimped by a curling process and is bitten into the sealing portion 28. As a result, the outer case 20 is firmly sealed. 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 formed so as to protrude from the width W of the separators 40 and 42 which are insulating means, and is formed to have a length L corresponding to the arc length of each anode part 6 or cathode part 8. Yes. In each anode part 6 and cathode part 8 protruding with a length L, a crease line 43 is formed at a position that is parallel to the element end face 5 and slightly exposed from the element end face 5 as a preparation process for the bending process. The crease line 43 is a bent portion with the fold direction portion as a valley fold with respect to each anode portion 6 and cathode portion 8.

  Then, the anode part 6 or the cathode part 8 of the capacitor element 4 is processed into a capacitor as shown in FIG. 2 (or B in FIG. 4) 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, FIG. 4 is referred with respect to the anode portion 6 and the cathode portion 8 of the capacitor element. FIG. 4 shows an example of the anode part and the cathode part of the capacitor element. A shows the anode part and the cathode part before molding, and B shows the anode part and the cathode part after molding. 4, the same parts as those in FIGS. 1, 2, and 3 are denoted by the same reference numerals.

As shown in FIG. 4A, an anode portion 6 and a cathode portion 8 constituting an electrode extension portion are erected on the element end face of the capacitor element 4, and a predetermined gap is provided between the anode portion 6 and the cathode portion 8. A width insulation interval 44 is set. The Y-axis is taken at the center of the insulation interval 44, the X-axis is orthogonal to the Y-axis, and the angles θ ₁ and θ ₂ (> θ ₁ ) are set to the left and right around the X-axis. A plurality of cuts 48 are made in the radial direction around the winding center portion (core portion) 46 of the capacitor element 4 at an angle θ ₁ , and a plurality of partition portions 6A, 6B, 6C partitioned by each cut 48 are anode portions. 6 side is formed. Similarly, a plurality of partition portions 8A, 8B, and 8C are also formed on the plurality of cathode portions 8 side. For example, if the angle θ ₁ is set to 33 °, the partition portions 6A and 8A have 2θ ₁ = 66 °, and the partition portions 6B and 6C or the partition portion 8A formed with the partition portion 6A interposed therebetween. The angle θ ₂ of the partition portions 8B and 8C formed in (5) is set to θ ₂ = 57 [°].

For example, the depth of the cut 48 is set to the height h ₁ of the anode part 6 and the cathode part 8 with the overhang length, the partition parts 6A, 6B, 6C of the anode part 6, and the partition parts 8A, 8B, 8C of the cathode part 8. Is bent in the middle, and is pushed down to the element center side of the capacitor element 4 to perform compression molding, so that each of the partition parts 6A, 6B, 6C, the partition part 8A of the cathode part 8, as shown in FIG. Molded into 8B and 8C. In this embodiment, the partition sections 6B and 6C and the partition sections 8B and 8C are set as weld portions. Therefore, the protruding height h ₂ of the partition parts 6A, 8A is set higher than the height h _{3 of} each partition part 6B, 6C, 8B, 8C, and the partition parts 6A, 6B, 6C and the partition part 8A of the cathode part 8 The heights 8B and 8C correspond to the bent shapes of the anode current collector plate 12 and the cathode current collector plate 16.

  In addition, the anode part 6 and the cathode part 8 of a capacitor | condenser element can suppress a height dimension by compressing and molding the whole anode part 6 and the cathode part 8 toward an element center direction in this way. In this embodiment, the partition parts 6B and 6C of the anode part 6 are compression-formed to form a stable flat connecting surface, and then the partition part 6A which is a non-connecting surface is compression-molded, and each partition part The height dimension of the boundary portion caused by the overlap between the spaces 6A-6B and 6A-6C is suppressed. The suppression of the height dimension of the boundary portion is the same in the cathode portion 8.

  Next, the anode current collecting plate 12 (or the cathode current collecting plate 16) will be described with reference to FIG. FIG. 5 shows an example of the anode current collector plate (or cathode current collector plate), A is a plane thereof, and B is a side view of the anode current collector plate as viewed from the weld connection portion side.

  The anode current collecting plate 12 is formed of, for example, an aluminum plate that is the same as the electrode material, covers the partition portions 6A, 6B, and 6C (FIG. 4) of the anode portion 6 described above, and laser welds the partition portions 6B and 6C. A shape and an area having an area and a laser welding area with the anode terminal 10 are provided. In this embodiment, the size is a half of the element end face of the capacitor element 4, and is a substantially semicircular plate as a shape in which the insulation interval 44 is ensured.

As shown in FIG. 5A, the anode current collector plate 12 is formed with an arc-shaped cutout portion 50 corresponding to the winding center portion 46 of the capacitor element 4 at the string side center portion. A connection surface portion 52 that is cut off linearly in a direction orthogonal to the X axis around the X axis is formed. Further, as shown in FIG. 5B, the anode current collector plate 12 has a stepped portion 54 bent at a right angle with the arc-shaped notch 50 as the center, that is, with the angle θ ₁ left and right about the X axis. Thus, an arc-shaped terminal connection portion 56A and element connection portions 56B and 56C are formed. Each of the terminal connection portions 56A and the element connection portions 56B and 56C is formed on a flat surface, and forms a parallel surface with the step portion 54 interposed therebetween.

In the anode current collector plate 12, when the height of the terminal connecting portion 56A is h ₄ , the thickness of the anode current collector plate 12 is t, and the inner height of the terminal connecting portion 56A is h ₅ ,
h ₅ = h ₄ −t ≧ h ₂ −h ₃ (1)
Is set to Therefore, the inner height h ₅ of the terminal connecting portion 56A is the difference Δh (≧ h) between the protruding height h ₂ of the partition portions 6A and 8A and the height h ₃ of the partition portions 6B, 6C, 8B, and 8C. ₂ -h ₃ ) is absorbed, and the anode current collector plate 12 is in close contact with each of the partition portions 6B and 6C, and the partition portion 6A is stored. Note that the thickness t of the anode current collector plate 12 can be changed at the portions of the terminal connection portions 56B and 56C and the terminal connection portion 56A. For example, the thickness of the terminal connection portion 56A can be set thicker (1.2 times or more) than that of the terminal connection portions 56B and 56C. According to this, the terminal connection portion 56B, The heat generated in 56C is absorbed by terminal connecting portion 56A having a predetermined thickness, and the connection accuracy of laser welding is improved.

  This configuration and the relationship with other members are the same for the cathode current collector plate 16.

  Next, FIG. 6 is referred to regarding the connection between the anode current collector plate 12 and the cathode current collector plate 16 and the anode portion 6 and the cathode portion 8 of the capacitor element 4. FIG. 6 shows an example of the arrangement and connection state of the anode current collector plate and the cathode current collector plate on the element end face of the capacitor element.

  As shown in FIG. 6, the anode current collector plate 12 and the cathode current collector plate 16 are arranged so that one end face of the capacitor element 4 is centered on the winding center 46 and the arc-shaped notch 50 is aligned with the winding center 46. The gap 61 is set corresponding to the insulation gap 44 between the anode 6 and the cathode 8. The anode current collector plate 12 includes a partition portion 6A of the anode portion 6 of the capacitor element 4 on the lower surface side of the terminal connection portion 56A, and an anode portion of the capacitor element 4 on the lower surface side of the element connection portions 56B and 56C of the anode current collector plate 12. The six partition portions 6B and 6C are positioned and brought into close contact with each other. In the laser irradiation connection portion 66, the partition portions 6B and 6C and the element connection portions 56B and 56C are partially or entirely melted and connected by laser irradiation from the peripheral direction of the capacitor element 4 toward the element center portion direction. ing. Such connection is the same on the cathode current collector plate 16 side.

  In this embodiment, as shown in FIG. 6, laser irradiation is performed at two portions of the element connecting portions 56B and 56C separated by the step portion 54 of the anode current collecting plate 12 and the cathode current collecting plate 16, that is, the laser. This is an irradiation connection part 66. In this case, laser irradiation is performed as indicated by arrows [1], [2], [3] and [4] attached to the laser irradiation connection portion 66. In this laser irradiation, the capacitor element 4 is shielded by using an inert gas such as argon gas or helium gas as a shielding gas, and the influence of laser heat or sputtering on the capacitor element 4 is avoided.

  [1] This laser irradiation irradiates the element connecting portion 56B of one anode current collector plate 12 linearly from the outer peripheral side of the capacitor element 4 toward the element center direction.

  [2] Next, a series of laser irradiation is performed in a straight line from the element center side toward the element outer peripheral direction to the element connection part 58B of the other cathode current collector plate 16 opposed across the winding center part 46. It is welded by the operation.

  [3] Similarly, laser irradiation is performed from the outer peripheral side of the capacitor element 4 to the element connecting portion 56C of one anode current collector plate 12 in a straight line toward the element center direction.

  [4] In a series of operations of irradiating the element connecting portion 58C of the other cathode current collector plate 16 facing the winding center portion 46 with a laser linearly from the element center side toward the element outer peripheral side. Welded.

  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 the laser irradiation is performed linearly across the winding center portion 46. That is, the anode part 6 and the cathode part 8 and the current collector plates 12 and 16 are welded by setting a welding line (laser irradiation connection part 66) directed in the diameter direction of the capacitor element 4 with the winding center part 46 therebetween. Therefore, it is possible to shorten the welding time for connecting the anode portion 6 and the cathode portion 8 to each of the current collector plates 12 and 16, and to simplify the manufacturing process. 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 of laser irradiation [1] and [2], the element connecting portions 56B, 56C, 58B, 58C of the anode current collector plate 12 and the cathode current collector plate 16 are Each can be connected individually, such as irradiating in a straight line from the element center side toward the element outer peripheral side.

  In addition, in the continuous operation of laser irradiation [1] to [4], laser welding is performed from [1] to [4] instead of continuously irradiating the same part with laser, and then from [1] again. When 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 laser irradiation a plurality of times with a time interval at the same location, but the first laser welding is performed from [1] to [4], and laser welding is performed again from [1] to [4]. Therefore, laser irradiation can be performed continuously while taking a cooling interval, and the welding time by laser irradiation can be shortened.

  Regarding the continuous operations [1] to [4] of this laser irradiation, the laser output to the welding line from the start point to the end point of each laser irradiation may be attenuated stepwise or continuously. Specifically, three sections are provided from the start point to the end point of the laser output, and the laser output Pa of the start point section, the laser output Pb of the intermediate section, and the laser output Pc of the end point section are set, and the laser output satisfies Pa> Pb and Pb> Pc. It is attenuated. The laser output Pa in the start point section is set to the highest value, and is 50 [W] to 3000 [W] as an example. The laser output Pb is a laser output of 90% or less of the laser output Pa, and the laser output Pc is a laser output of 80% or less of the laser output Pa. In this way, the laser output to the welding line from the start point to the end point of each laser irradiation is attenuated stepwise or continuously, so that the welding energy applied to the current collector plates 12, 16, the anode portion 6 and the cathode portion 8 can be reduced. Uniformity can be achieved, connectivity can be improved, and stable welding connection can be realized. That is, the welding line (laser irradiation connection part 66) of the anode current collector plate 12 or the cathode current collector plate 16 and the anode part 6 or the cathode part 8 which have been subjected to laser irradiation and the vicinity thereof are heated, and laser irradiation is performed on the welding line 18. In this case, the heating moves in a chained state along with the scanning according to the scanning of the laser irradiation, so that even if the laser outputs are not set to be the same, the molten state is chained. For this reason, even if the laser output is attenuated stepwise and continuously, the thermal energy by the laser irradiation applied to the welded portion becomes uniform. For this reason, the connectivity between the anode current collector plate 12 or the cathode current collector plate 16 and the anode portion 6 or the cathode portion 8 is improved.

  As shown in FIG. 4, an anode portion 6 and a cathode portion 8 are formed on the element end surface 5 of the capacitor element 4. The anode part 6 and the cathode part 8 have an insulation interval 44 at which the anode part 6 and the cathode part 8 do not come into contact with each other when compression-molded toward the center direction. In the vicinity of the portion 46 (within 2 mm from the element center portion), the anode portion 6 and the cathode portion 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 15 [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. Insulating means 17 (FIG. 1) such as insulating paper or insulating tape may be installed on the outer peripheral surface of the cathode part 8 connected to the connected anode part 6 and cathode current collector plate 16. If this insulating means 17 is installed along the outer periphery so as to cover the anode terminal 10, the cathode terminal 14, the anode current collector plate 12, and the cathode current collector plate 16 in addition to the anode portion 6 and the cathode portion 8, an outer case Insulation with 20 is achieved.

  Next, FIG. 7 will be referred to regarding the connection between the anode terminal 10 and the anode current collector plate 12 and the connection between the cathode terminal 14 and the cathode current collector plate 16. FIG. 7 shows the connection between the anode terminal and the anode current collector plate, the cathode terminal and the anode current collector plate, A is the state anode terminal and anode current collector plate, the state before connection between the cathode terminal and anode current collector plate, and B is the laser. It is a figure which shows irradiation.

  As shown in FIG. 7, the anode terminal 10 and the cathode terminal 14 on the sealing plate 22 are positioned on the capacitor element 4 to which the anode current collecting plate 12 and the cathode current collecting plate 16 are connected. A terminal-side connection surface 64 is formed on the side surfaces of the anode terminal 10 and the cathode terminal 14, and the terminal-side connection surface 64 forms the same surface as the connection surface portion 52 on the anode current collector plate 12 and the cathode current collector plate 16. It is a side wall surface. Therefore, if the connection surface portion 52 and the terminal side connection surface 64 are matched and laser irradiation 68 is performed, the weld connection portion 18 described above is laser welded, and the connection surface portion 52 and the terminal side connection surface 64 are welded. it can.

  Therefore, the anode terminal 10 which is an external terminal is connected to the anode portion 6 of the capacitor element 4 through the anode current collector plate 12 through the welding connection portion 18 by the laser irradiation 68, and the anode portion 10 of the capacitor element 4 is connected to the cathode portion 8 of the capacitor element 4. The cathode terminal 14, which is an external terminal, is connected via a cathode current collector plate 16 by a welding connection portion 18 by laser irradiation 68, and an external terminal is formed on the capacitor element 4.

Here, if the distance (distance) between the capacitor element 4 and the sealing plate 22 is increased, the resistance increases and the height of the electric double layer capacitor 2 increases. The distance (distance) from the sealing 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 connection surface portion 52 and the terminal side connection surface 64 are matched. The welding is simplified and strengthened by using the common surface portion and welding by laser irradiation that can be locally welded to this portion. 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 connection surface portion 52 and the terminal side connection surface 64) are 0.5 mm to 5 mm, respectively. The range is set in the range of [mm]. According to this, it is possible to perform laser welding, the internal resistance is hardly increased, and the height of the electric double layer capacitor 2 can be shortened.

Further, the connection surface portion 52 and the terminal-side connection surface 64 are installed near 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.

  In the anode current collecting plate 12 and the cathode current collecting plate 16, the connection region between the anode part 6 and the cathode part 8 of the capacitor element 4 and the connection region between the anode terminal 10 and the cathode terminal 14 are set at different positions. Therefore, the connection between each electrode portion and the current collector plate, and each external terminal and the current collector plate can be stabilized, and the connection can be strengthened together with the lower resistance of the capacitor element.

  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.

  (6) Since the side surfaces of the anode current collecting plate 12 or the cathode current collecting plate 16 and the external terminal (the anode terminal 10 or the cathode terminal 14) are made the same surface, the laser irradiation with respect to both can be stabilized, and the complete connection and Reliability can be increased.

  (7) Since a shield gas is used during laser irradiation, the capacitor element 4 can be protected from laser heat and flying spatter, the characteristic deterioration of the capacitor element 4 and the capacitor 2 as a product can be prevented, and reliability can be improved. it can.

[Second Embodiment]

  The second embodiment discloses a method for manufacturing a capacitor as described above.

  The second embodiment will be described with reference to FIG. 8, FIG. 9, and FIG. FIG. 8 is a flowchart showing an example of the manufacturing process of the electric double layer capacitor according to the second embodiment, FIG. 9 is a molding state of the anode part and the cathode part, and FIG. 10 is laser welding of the current collector plate and the capacitor element. The process is shown.

  This manufacturing process is an example of a method of manufacturing a capacitor according to the present invention. As shown in FIG. 8, the capacitor element 4 and the electrode part (electrode overhanging part) forming step (step S11), the anode part 6 and the cathode part 8 forming step (step S12), first connecting step (step S13), second connecting step (step S14), electrolyte solution impregnation and sealing step (step S15).

  (1) Capacitor element 4 and electrode part (electrode overhanging part) forming step (step S11)

  As shown in FIG. 3, the separator elements 40 and 42 are sandwiched between the anode body 60 and the cathode body 80, and the capacitor element 4 is formed by winding it in a cylindrical shape around the winding center 46. In the capacitor element 4, a part of the anode body 60 and the cathode body 80 is projected on the element end face side, and an anode section 6 and a cathode section 8 are formed as electrode projecting sections. An insulation interval 44 is set in the anode portion 6 and the cathode portion 8.

  (2) Molding process of anode part 6 and cathode part 8 (step S12)

  In this molding step, the anode portion 6 and the cathode portion 8 as the electrode overhang portions are partitioned into the partition portions 6A, 6B, 6C, 8A, 8B, and 8C as shown in FIG. As shown in B, each is bent in the direction of the winding center 46 and molded (step S12). The molding corresponds to the bent shape of the anode current collector plate 12 and the cathode current collector plate 16 as shown in FIG. In FIG. 9, A and B are bending states of the partition portions 6B and 6C of the anode portion 6 connected to the anode current collector plate 12 and the partition portions 8B and 8C of the cathode portion 8 connected to the cathode current collector plate 16 ( A shows a molding state before installing an anode current collector plate 12 and a cathode current collector plate 16 to be described later, and B shows molding after installing the anode current collector plate 12 and the cathode current collector plate 16. Indicates the state. That is, the anode current collector plate 12 and the cathode current collector plate 16 are pressed against the anode portion 6 and the cathode portion 8 or the anode portion 6 and the cathode portion 8 are pressed against the anode current collector plate 12 and the cathode current collector plate 16 for compression. Thus, the partition sections 6B and 6C of the anode section 6 and the partition sections 8B and 8C of the cathode section 8 become flat, and are in close contact with the anode current collector plate 12 and the cathode current collector plate 16. In addition, as shown in FIG. 3, a crease line 43 may be provided in advance in the anode part 6 or the cathode part 8 before the anode part 6 or the cathode part 8 is bent and molded. The crease line 43 is formed at a position having a certain width (0.5 mm or more) from the element end face, thereby reducing mechanical stress applied to the separator portion at the element end face position when the anode portion 6 or the cathode portion 8 is bent. In addition, it is possible to prevent a short circuit due to contact between the anode body 60 and the cathode body 80. Note that the crease line 43 is not a flaw but a marking line, and can prevent buckling of the anode part 6 and the cathode part 8 during bending. The crease line 43 is a groove, and the cross-sectional shape may be triangular, square, or curved (R). For example, a method such as pressing, laser, or cutting may be used to form the crease line 43. Although the crease line 43 may be one as shown in FIG. 3, a plurality of crease lines 43 may be provided according to the width of the anode part 6 or the cathode part 8. The formation surface portion of the crease line 43 may be one surface of the anode portion 6 or the cathode portion 8, but may be both surfaces. The crease line 43 as an example is formed so that the surface of the element end face facing the winding center 46 is valley-folded.

  (3) 1st connection process (step S13)

  In this connection step (step S13), as shown in FIG. 10A, the anode current collector plate 12 is positioned on the anode portion 6 of the capacitor element 4, and the cathode current collector plate 16 is positioned on the cathode portion 8 of the capacitor element 4. 10B, 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. In this laser welding, an inert gas such as argon gas or helium gas is used as a shielding gas, so that the capacitor element 4 is shielded, and the capacitor element 4 is separated from laser heat or flying spatter.

  (4) Second connection process (step S14)

  In this connection step (step S14), as shown in FIG. 7, the anode current collector plate 12 connected to the anode portion 6 and the connection surface 52 of the anode terminal 10 on the sealing plate 22 and the terminal side connection surface 64 are the same. Connect to the surface by laser welding. Similarly, the cathode terminal 14 of the sealing plate 22 is connected to the cathode current collector plate 16 connected to the cathode portion 8 by laser welding. Also in this laser welding, by using an inert gas such as argon gas or helium gas as a shield gas, the capacitor element 4 is shielded, and the capacitor element 4 is separated from laser heat or flying spatter.

  In this embodiment, as shown in FIG. 7A, 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, By positioning the cathode terminal 14 of the sealing plate 22 with respect to the cathode current collector plate 16 connected to the cathode portion 8, each is laser welded as shown in FIG. 7B. Reference numeral 18 denotes the weld connection 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.

  (5) Electrolyte impregnation and sealing process (step S15)

  The capacitor element 4 is impregnated with an 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), and the electric double layer capacitor 2 (FIG. 1) as a product. ) Is completed.

  According to such a manufacturing process, the above-described electric double layer capacitor 2 can be easily manufactured, the terminal connection process can be simplified, and the capacitor having the effect as described in the first embodiment. Can be realized.

[Third Embodiment]

In the third embodiment, it discloses embodiments of the arrangement of the external terminals and the current collecting plate.

  The third embodiment will be described with reference to FIG. FIG. 11 shows the connection between the current collector plate and the external terminal according to the third embodiment. A shows the laser irradiation before the connection and B shows the laser irradiation during the connection.

  As shown in FIG. 11A, the anode terminal 10 and the cathode terminal 14 installed on the sealing plate 22 of this embodiment are arranged close to the winding center portion 46 of the element end face of the capacitor element 4. . The terminal side connection surfaces 64 of the anode terminal 10 and the cathode terminal 14 are set back from the outer peripheral surface of the capacitor element 4 toward the winding center 46.

  In this embodiment, as shown in FIG. 11A, the terminal connection portion 56A of the anode current collector plate 12 and the cathode current collector plate 16 is used for the anode terminal 10, the cathode terminal 14, and the terminal side connection surface 64. , 58A is formed with a recess 70 which is retracted toward the winding center 46 side. In the recess 70, the connection surface portion 52 described above is formed corresponding to the terminal side connection surface 64 of the anode terminal 10 or the cathode terminal 14. In this case, in the anode current collector plate 12 or the cathode current collector plate 16, the element connection portions 56 </ b> B and 56 </ b> C constitute a flat portion protruding in the outer peripheral direction of the capacitor element with respect to the side surface portion of the terminal side connection surface 64.

  With such a configuration, as shown in FIG. 11A, even if the anode terminal 10 and the cathode terminal 14 are arranged close to the winding center portion 46 on the element end face of the capacitor element 4, the terminal side connection The surface 64 and the connection surface 52 can be maintained on the same surface, and the connection by the laser irradiation 68 similar to the above embodiment can be performed.

  In this embodiment, the concave portion 70 is formed in the anode current collector plate 12 and the cathode current collector plate 16, but the connection surface 52 may be formed by a convex portion.

[Fourth Embodiment]

  In the fourth embodiment, another form of the current collector plate is disclosed.

  FIG. 12 is referred to regarding the fourth embodiment. FIG. 12 shows the current collector plate according to the fourth embodiment, the connection between the current collector plate and the external terminal, A is the current collector plate before connection, B is before connection, and C is the laser irradiation during connection. ing.

  As shown in FIG. 12A, the current collector plates 12 and 16 of this embodiment are configured to cover the element end face 5 of the capacitor element 4 with an interval 61, and are back as in the first embodiment. On the side, a recess 69 for accommodating the partition portions 6A and 8A is formed. On the surface portions of the current collector plates 12 and 16, the connecting portions with the partition portions 6 </ b> A and 8 </ b> A of the capacitor element 4 are fan-shaped protrusions 71, and the partition portions 6 </ b> B and 6 </ b> B of the capacitor element 4 are sandwiched between the protrusions 71. Concave portions 73 and 75 corresponding to 6C, 8B and 8C are formed. The concave portions 73 and 75 constitute a flat portion that protrudes in the outer peripheral direction of the capacitor element 2 from the connection portion with the external terminal. The protrusion 71 is formed with a notch 77 on the peripheral side, and a peripheral surface facing the notch 77 is formed in an arc shape to form a connection surface 79 with the anode terminal 10 or the cathode terminal 14. A rectangular parallelepiped protrusion 81 is formed on the recesses 73 and 75 side as means for simultaneously gripping (chucking) the current collector plates 12 and 16.

  As shown in FIG. 12B, the current collector plates 12 and 16 of this embodiment are installed so as to cover the element end surface 5 of the capacitor element 4, and the anode portion 6 and the concave portions 73 and 75 of the current collector plate 12 are provided. The cathode part 8 and the concave portions 73 and 75 of the current collector plate 16 are similarly connected by laser welding.

  Then, as shown in FIG. 12C, the anode terminal 10 is overlaid on the current collector plate 12 connected to the capacitor element 4, and the cathode terminal 14 is overlaid on the current collector plate 16. The connecting surface 79 having the same curved surface as 64 is matched, and similarly, the connecting surface 79 having the same curved surface as the curved surface portion of the cathode terminal 14 is matched and positioned. In this positioning state, the current collector plates 12 and 16 are connected to the anode terminal 10 or the cathode terminal 14 by performing laser irradiation 68. The recesses 73 and 75 are in the protrusion 71. A connecting surface 79 connected to the anode terminal 10 or the cathode terminal 14, that is, a flat portion protruding in the outer peripheral direction of the current collector plates 12 and 16 from the side surface portion welded to the terminal member is formed. The element end surface 5 of the capacitor element 4 can be covered with the flat portion.

  In such a configuration, the element end face 5 of the capacitor element 4 is covered with the current collector plates 12 and 16, and the element end face 5 of the capacitor element 4 can be protected from spattering by the laser irradiation 68 on the connection surface 79 side. Moreover, since the connection surface 79 is a curved surface that matches the curved surfaces of the anode terminal 10 and the cathode terminal 14, welding can be performed with the connection surface 79 matching the connection surface 64 of the anode terminal 10 and the cathode terminal 14. That is, good laser welding can be performed.

[Fifth Embodiment]

  The fifth embodiment discloses that positioning means is provided on any one of the sealing plate, the external terminal, and the current collecting plate, and the connection position between the external terminal and the current collecting plate is determined by the positioning means.

  A fifth embodiment will be described with reference to FIG. FIG. 13 shows a sealing plate according to the fourth embodiment, in which A shows a sealing plate viewed from the back side, and B shows an anode current collecting plate and a cathode current collecting plate positioned by the sealing plate.

  On the back side of the sealing plate 22 of this embodiment, as shown in FIG. 13A, a positioning convex portion 72 made of an insulating material is formed in a space portion between the anode terminal 10 and the cathode terminal 14, This positioning projection 72 is projected toward the winding center 46 of the capacitor element 4 (FIG. 1). The positioning convex portion 72 includes a columnar portion 74 and a pair of flat plate-like standing wall portions 76. The columnar part 74 is a columnar part corresponding to the arc of each arcuate notch 50 of the anode current collector plate 12 and the cathode current collector plate 16. The flat plate-like wall portion 76 includes a columnar portion 74, and the flat plate-like wall portion 76 that maintains the interval 61 between the anode current collector plate 12 and the cathode current collector plate 16 around the columnar portion 74. .

If Sonaere the sealing plate 22 provided with such a positioning projection 7 2, the anode current collector plate 12 and the cathode current collector plate 16 is positioned at a predetermined position by the positioning protrusion 72, maintaining the gap 61 to a predetermined width w can do. That is, the circular arc-shaped notch 50 of the anode current collector plate 12 and the cathode current collector plate 16 is fitted in the cylindrical portion 74 of the positioning convex portion 72, and the anode current collector plates 12 and By contacting the cathode current collector plate 16, the anode current collector plate 12 and the cathode current collector plate 16 are positioned at predetermined positions. By this positioning, the terminal-side connection surface 64 of the anode terminal 10 and the connection surface 52 of the anode current collector plate 12, and the terminal-side connection surface 64 of the cathode terminal 14 and the connection surface 52 of the cathode current collector plate 16 can be matched. The connection by laser irradiation can be stabilized, the connection accuracy can be improved, and the anode 6 and the cathode 8 are reliably insulated and isolated by the positioning projection 72.

  In this embodiment, the positioning projection 72 is formed on the sealing plate 22 side. However, the external terminals (the anode terminal 10 and the cathode terminal 14) or the current collectors (the anode current collector 12 and the cathode current collector 16). Positioning means may be provided in any of the above. Even with such a configuration, the connection position between the external terminal and the current collector plate can be determined by the positioning means, the laser irradiation surface can be made uniform, the connection can be stabilized, and a highly reliable connection can be achieved. realizable.

[Sixth Embodiment]

  The sixth embodiment discloses that a connection plate is provided separately from the current collector plate.

  FIG. 14 is referred to for the sixth embodiment. FIG. 14 shows an electric double layer capacitor according to a sixth embodiment.

  In the sixth embodiment, as shown in FIG. 14, the anode connection plate 88 is provided together with the anode terminal 10 as the anode terminal member, and the cathode connection plate 90 is provided together with the cathode terminal 14 as the cathode terminal member. The anode connecting plate 88 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 90 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 88 is formed with a connection recess 92 for positioning and connecting the anode terminal 10, and the cathode connection plate 90 is formed with a connection recess 94 for positioning and connecting the cathode terminal 14. A connection surface portion 96 corresponding to the connection surface 52 of the anode current collector plate 12 or the cathode current collector plate 16 is formed on a part of the peripheral surface of the anode connection plate 88 and the cathode connection plate 90. The connection surface 52 forms the same surface, and is laser-welded and electrically connected.

  In such a configuration using the anode connection plate 78 and the cathode connection plate 80, the anode terminal 10 and the cathode terminal 14 which are external terminals, and the anode current collector plate 12 and the cathode current collector plate 16 connected to the capacitor element 4 side. Can be connected in a wide range, connection resistance can be reduced, and connection strength can be increased.

[Other Embodiments]

  (1) In the embodiment described above, the winding element is exemplified as the capacitor element, but is not limited to the winding element. A multilayer element or a solid element may be used.

  (2) The above embodiment discloses a configuration in which the anode portion 6 and the cathode portion 8 are provided on one (same surface) of the element end faces of the capacitor element and connected to the external terminal. It is good also as a structure which equips a part and the other element end surface with a cathode part.

  (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) In the above embodiment, the anode current collector plate 12 and the cathode current collector plate 16 are exemplified as the current collector plates. However, the present invention is not limited to the above embodiment. The connection surface 52 is a flat surface, but may be a curved surface as a shape that matches the shape of the external terminal. The position of the connection surface 52 may be either in the surface of the current collector plate or on the peripheral surface, and may be provided with a connecting convex portion.

  (5) In the above embodiment, an insulation interval is provided between the anode part and the cathode part, but an insulation member may be provided at this insulation interval.

  (6) In the above embodiment, laser welding and electron beam welding are exemplified as the welding means, but the present invention is not limited to this. Arc welding or the like can also be used. In this case, the connection surface 52 may be formed by projecting the outer peripheral surface side of the current collector plate, and the connection surface 52 and the terminal connection surface 64 may be arc-welded.

  (7) In the above embodiment, the anode portion 6 and the cathode portion 8 are formed in a semicircular shape, but the present invention is not limited to this. Of the partition sections 6A, 6B, 6C of the anode section 6 and the partition sections 8A, 8B, 8C of the cathode section 8 shown in the embodiment, the partition section 6B connected to the anode current collector plate 12 and the cathode current collector plate 16, Only 6C, 8B, and 8C are formed so as to protrude, and the anode portion 6A and the cathode portion 8A do not need to protrude.

  (8) In the above embodiment, the section 12B, 12C or 16B, which is the element connection area between the anode section 6 and the cathode section 10, and 16C are connected to the terminal by dividing into three positions as different positions of the current collector plate. Although the partition part 12A or 16A which is a region is set on the front and back surfaces of the current collector plate and is set at a different position in the horizontal direction, it is not limited thereto. The element connection region (laser irradiation connection portion 66) may be set in a part of the current collector plate, and the terminal connection region (weld connection portion 18) may be set in other portions. That is, the element connection region and the terminal connection region may be close to each other as long as the welding positions are different on the front and back surfaces of the current collector plate. That is, the welding connection portion 18 may be set in a portion where the welding position does not overlap between the laser irradiation connection portion 66 and the front and back surfaces of the current collector plate in the partition portion 12B which is an element connection region.

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 Welded 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

Claims (10)

Capacitor element which is a winding element or a non-winding element provided with an electrode body on the anode side and a cathode side, and a separator interposed between these electrode bodies,
A sealing member that seals the opening of the case member that houses the capacitor element;
A single or a plurality of electrode overhang portions projecting from either one or both of the electrode bodies on the element end face of the capacitor element;
A single or a plurality of current collectors connected to the electrode overhang, and
A terminal member that is installed on the sealing member, overlapped with the current collector plate, and a side surface portion welded to the side surface portion of the current collector plate ;
And the side surface portion of the terminal member forms a common surface portion with the side surface portion of the current collector plate .   The capacitor according to claim 1, wherein the welding is laser welding or electron beam welding.   The electrode extension part is an assembly formed by a part of the electrode body, and is bent on the element end surface toward the element center part of the capacitor element and joined to the current collector plate. The capacitor according to any one of claims 1 and 2.   The electrode projecting portion includes an anode projecting portion projecting from the electrode body on the anode side of the capacitor element to an element end surface, the same element end surface as the element end surface from the electrode body on the cathode side of the capacitor element, or a different element 4. The capacitor according to claim 1, wherein the capacitor is one or both of a cathode overhanging portion that projects from the end face.   In the case where the anode overhanging portion and the cathode overhanging portion are installed on the common element end face of the capacitor element, the anode overhanging portion and the cathode overhanging portion are insulated by an insulating interval or an insulating member. The capacitor according to claim 4. The current collector plate is
A single or a plurality of first welding surfaces to be welded to a single or a plurality of welding surfaces formed on a part or all of the single or a plurality of electrode projections formed on the element end face of the capacitor element; ,
A second welding surface portion provided on a side surface intersecting with the first welding surface portion and welded to the terminal member;
Capacitor according to any one of claims 1, 2, 3, 4 or 5, characterized in that it comprises a. The electrode extension portion is partitioned at a predetermined angle around the element center portion of the element end surface, and a plurality of partition portions bent in the center direction of the element end surface with the same or different bending angles;
A single or a plurality of welding surface portions formed with the partition portion on the element end surface; and
Capacitor according to any one of claims 2, 3, 4, 5 or 6, characterized in that it comprises a. The current collector plate includes a recess formed by retreating from the outer peripheral portion of the capacitor element toward the center side of the end face of the capacitor element, and a flat portion protruding in the outer peripheral direction of the capacitor element from the concave portion welded to the terminal member. capacitor according to any one of claims 1,2,3,4,5,6 or 7, characterized in that it comprises and. The electrode body is protruded from the element end face of a capacitor element which is a winding element or a non-winding element provided with an anode-side and cathode-side electrode body and a separator interposed between the electrode bodies, Forming a single or a plurality of electrode overhangs;
A terminal member installed on a sealing member that seals an opening of a case member that accommodates the capacitor element, and a single or a plurality of current collector plates connected to the electrode overhanging portion are overlapped, and a side surface of the terminal member Welding a portion and a side portion of the current collector plate;
Only including the positioning of the side portion of the current collector plate to said side surface portion of the terminal member, a manufacturing method of a capacitor, characterized in that performing the welding between the side portion as a common surface. The method for manufacturing a capacitor according to claim 9 , wherein the welding is laser welding or electron beam welding.

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