JP5866772B2 - Capacitor and its terminal connection method - Google Patents

Description

The present invention relates to a connection technique between a capacitor element and a terminal member, for example, a capacitor using laser welding, electron beam welding, or the like for connection and a terminal connection method thereof.

  In the electric double layer capacitor or the electrolytic capacitor, an external terminal is connected to the capacitor element. Regarding this 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, 2), covering the current collector foil exposed on the end face of the winding element, including a current collector plate, and welding and connecting the current collector plate and the current collector foil (for example, Patent Literature 3), It is known that an electric 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

  By the way, in the terminal structure provided with the current collector plate between the capacitor element and the terminal member, the current collector plate connected to the anode or cathode of the capacitor element and the terminal member are connected, and the resistance of the capacitor element is reduced. Excellent electrical characteristics can be obtained. The current collector plate and the terminal member are connected by welding.

  In connection by welding, the alignment state between the terminal member and the current collector plate, which is one of the welding conditions, affects the connection accuracy and connection reliability.

  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 capacitor and the terminal connection method of the present invention is to facilitate the connection and improve the connection reliability.

In order to achieve the above object, a capacitor according to the present invention includes a capacitor element having an anode and a cathode, and is connected to the anode or the cathode by being installed on the element end face of the capacitor element, and has a circular arc shape in the lateral direction of the capacitor element a current collector plate having a first connection face, have a first connecting surface and the concentric second connection surface of the collector plate, and the connection surface of the second said second connection surface matching is welded to the first connection surface is obtained by a terminal member that are connected to the collector plate.

  In order to achieve the above object, in the capacitor, more preferably, the first connection surface and the second connection surface may be concentric surfaces based on the element center of the capacitor element.

  In order to achieve the above object, in the capacitor, more preferably, the current collector plate may be provided with a cover portion covering an element end surface of the capacitor element along the first connection surface.

In order to achieve the above object, in the capacitor, more preferably, the current collector plate includes a plurality of the first connection surfaces that are concentric with respect to the element center of the element end surface, and the capacitor element May be installed on a plurality of electrode portions formed on the same end face.

  In order to achieve the above object, a capacitor terminal connection method according to the present invention includes a current collector plate installed on an element end face of a capacitor element and connected to an anode side or a cathode side. A first connection surface is formed, a second connection surface concentric with the connection surface of the current collector plate is formed on a terminal member connected to the current collector plate, and the first connection surface and the second connection surface are formed. And using the welding means for irradiating a beam to the capacitor element or the first connection face and the second connection face, rotating the capacitor element or the welding means, A connection surface and the second connection surface are welded to connect the current collector plate and the terminal member.

  To achieve the above object, in the capacitor terminal connection method, more preferably, the first connection surface and the second connection surface are formed concentrically on the basis of the element center of the capacitor element, The capacitor element or the welding means may be rotated with the element center as a rotation center.

In order to achieve the above object, in the capacitor terminal connection method, more preferably, the current collector plate is formed with a cover portion covering the element end surface of the capacitor element along the first connection surface. May be used.

  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 terminal member is provided with a second connection surface that matches the first connection surface of the current collector plate connected to the capacitor element, and the first and second connection surfaces are welded, The connection between the plate and the terminal member can be facilitated, and the connection reliability can be improved.

  (2) The welding accuracy of laser welding or electron beam welding can be increased.

  (3) The welding process can be simplified and the connection process can be speeded up.

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

It is a figure which shows an example of the terminal connection structure of the electric double layer capacitor which concerns on 1st Embodiment. It is a perspective view which shows an example of a current collecting plate and a capacitor | condenser element. It is a perspective view which shows the laser irradiation with respect to the current collector plate and external terminal which were positioned. It is a figure which shows an example of the laser irradiation with respect to a current collecting plate and an external terminal. It is a figure which shows the modification of laser irradiation with respect to a current collecting plate and an external terminal. It is a figure which shows the welding example of a current collecting plate and an external terminal. It is sectional drawing which shows an example of an electrical double layer capacitor. It is a figure which shows an example of the welding procedure of the current collecting plate and external terminal which concern on 2nd Embodiment.

[First Embodiment]

  The terminal structure and terminal connection method of the electric double layer capacitor according to the first embodiment will be described with reference to FIG. FIG. 1 shows an example of a capacitor element and a sealing plate to which a current collector plate is connected.

  The electric double layer capacitor 2 (FIG. 7) is an example of the capacitor of the present invention, and includes a capacitor element 4. The capacitor element 4 is a winding element wound with a separator interposed between the anode-side and cathode-side electrode foils, but is not limited to this winding element. That is, it may be a laminated element in which a separator is interposed between the anode-side and cathode-side electrode foils.

  The edge of the electrode foil on the anode side and the cathode side is exposed from the edge of the separator on the element end face 6 of the capacitor element 4, the anode part 8 is on one of the semicircular parts of the element end face 6, and the other half of the half circumference part is on the other side. The cathode portion 10 is formed. The anode part 8 and the cathode part 10 are insulated from each other by an insulation interval 12. Anode-side current collector plate 14A is installed in anode portion 8, and cathode-side current collector plate 14B is installed in cathode portion 10, and insulation between current collector plate 14A and current collector plate 14B is set by setting insulation interval 16. Has been.

  The anode portion 8 and the current collector plate 14A are welded by laser welding or electron beam welding at a welding portion 18 set on the current collector plate 14A, and are electrically connected. Similarly, the cathode portion 10 and the current collector plate 14B are welded by laser welding or electron beam welding at a welding portion 18 set on the current collector plate 14B, and are electrically connected. Each welded portion 18 is, for example, a 45 ° fan-shaped surface portion, and is formed on each current collector plate 14A, 14B. In each welded portion 18, reference numeral 19 denotes a laser or electron beam irradiation portion.

  The capacitor element 4 and the current collector plates 14A and 14B are referred to FIG. FIG. 2 shows a capacitor element and a current collector plate.

  On the element end face 6 of the capacitor element 4, the above-described anode portion 8 and cathode portion 10 are formed in a semicircular shape with an insulating interval 12 having a constant width between the element centers. The capacitor element 4 as an example is wound with, for example, a separator having an anode-side and cathode-side electrode foil interposed therebetween, and the element end face 6 is formed by the edge of a separator wider than the electrode foil. Yes. The anode portion 8 is formed of an anode-side electrode foil projecting from the edge of the separator, and the electrode foil protruded from the element end surface 6 is folded toward the element center 21 to be formed flat. Similarly, the cathode portion 10 is formed of a cathode-side electrode foil projecting from the edge of the separator, and the electrode foil protruding from the element end face 6 is folded toward the element center 21 and formed flat.

  Further, the anode 8 and the cathode 10 are divided into a predetermined angle θ, for example, by making a notch 9 at an angle of 30 [degrees], and an electrode protrusion 11 at the center, and the current collector sandwiching the electrode protrusion 11 A plate weld portion 13 is formed. The current collector plate welded portion 13 is compression-molded from the electrode protruding portion 11, and a step is provided between the current collector plate welding portion 13 and the electrode protruding portion 11.

  As shown in FIG. 2, each current collector plate 14 </ b> A, 14 </ b> B is formed with, for example, a 90-degree fan-shaped terminal welded portion 20 between each welded portion 18, and has an arc shape corresponding to the element center 21. A notch 23 is formed. A terminal installation surface portion 22, a first connection surface 24, and an element cover portion 26 are formed on the welded portion 20.

  The terminal installation surface portion 22 is a surface portion on which an external terminal is installed, and its form is, for example, a flat surface portion on which the anode terminal 30A or the cathode terminal 30B that is an external terminal is placed. The surface portion of the anode terminal 30A or the cathode terminal 30B is a flat surface, and each anode terminal 30A or the cathode terminal 30B is brought into close contact with the terminal installation surface portion 22. A concave portion 27 into which the anode protruding portion 8 of the capacitor element 4 side or the electrode protruding portion 11 of the cathode portion 10 is inserted is formed on the back side of the terminal installation surface portion 22.

  The connection surface 24 is an arcuate surface portion that faces the side surface of the capacitor element 4. The element covering portion 26 is a flat surface portion that falls with the terminal installation surface portion 22 and the connection surface 24 as steps, and covers the element end surface 6 of the capacitor element 4. That is, by leaving the flat terminal installation surface portion 22 on each of the current collector plates 14A and 14B and cutting or molding the element cover portion 26 in an arc shape, the connection surface 24 is a step between the terminal installation surface portion 22 and the element cover portion 26. It is the circular arc surface formed by. The arc surface of the connection surface 24 is a concentric circular surface that is the same as or approximate to the capacitor element 4 that is the element center of the capacitor element 4.

  The sealing plate 28 is made of, for example, a hard insulating synthetic resin plate, and includes, for example, a circular sealing main body 34, and a sealing ring 36 is provided on an outer surface side edge of the sealing main body 34. The sealing body 34 is formed by insert-molding an anode terminal 30A and a cathode terminal 30B, which are external terminals, and the connection end 38 of the anode terminal 30A and the cathode terminal 30B protrudes from the element side end face of the sealing body 34. A second connection surface 40 is formed on the peripheral surface portion of each connection end 38. The connection surface 40 is an arcuate surface portion that is the same as the connection surface 24 on the side of the current collector plates 14 </ b> A and 14 </ b> B, and is a concentric surface that is the same as or close to the connection surface 24. Therefore, if the anode terminal 30A or the cathode terminal 30B is installed on the terminal installation surface portion 22 of the current collector plates 14A, 14B, the connection surface 40 is aligned with the connection surface 24 of the current collector plates 14A, 14B, Can be set to concentric circles.

  Next, FIG. 3 will be referred to regarding welding of the current collector plates 14A and 14B and the external terminals. FIG. 3 shows a terminal connection process.

  Anode-side current collector plate 14A is installed and welded to anode portion 8 of element end surface 6 of capacitor element 4 shown in FIG. 3, and cathode-side current collector plate 14B is installed and welded to cathode portion 10. Yes.

  An anode terminal 30A is installed on the terminal installation surface portion 22 of the current collector plate 14A, and a cathode terminal 30B is installed on the terminal installation surface portion 22 of the current collector plate 14B. The connection surface 40 of the anode terminal 30A is positioned on the connection surface 24 of the current collector plate 14A to form a uniform surface portion. Similarly, the connection surface 40 of the cathode terminal 30B is positioned on the connection surface 24 of the current collector plate 14B to form a uniform surface portion.

  In this way, the two surface portions are set as uniform surface portions, laser irradiation 42 is performed, and the connection surfaces 24 and 40 are welded. An anode terminal 30A is connected to the terminal installation surface portion 22 of the current collector plate 14A, and a cathode terminal 30B is connected to the terminal installation surface portion 22 of the current collector plate 14B. That is, the anode portion 8 of the capacitor element 4 is connected to the anode terminal 30A, and the cathode portion 10 is connected to the cathode terminal 30B.

  Since each of the connection surfaces 24 and 40 is an arc surface having the same radius of curvature, the welded portion by the laser irradiation 42 is set in a wide range.

  This laser welding will be described with reference to FIG. FIG. 4 shows an example of the laser irradiation angle and the welding surface.

  The current collector plates 14 </ b> A and 14 </ b> B are installed with reference to the element center 21 of the element end face 6 of the capacitor element 4, and are connected to the anode part 8 or the cathode part 10 of the capacitor element 4. Therefore, the connection surface 24 of each terminal welded portion 20 of each current collector plate 14A, 14B constitutes an arc surface based on the element center 21.

On the other hand, as shown in FIG. 4, the anode terminal 30 </ b> A or the cathode terminal 30 </ b> B installed on the terminal installation surface portion 22 causes the connection surface 40 to coincide with the connection surface 24. The laser emitting unit 46 of the laser irradiation device 44 is installed toward the connection surfaces 24 and 40.

  If the distance between the laser emitting portion 46 and the laser irradiation point 48 of the connection surfaces 24 and 40 is L, even if the laser irradiation device 44 is rotated in the direction of the arrow N with the element center 21 as the rotation center, the distance L can be maintained. When the rotation angle θ of the laser irradiation device 44 is set around the laser irradiation point 48 and this rotation angle θ is set in the welding range, the laser irradiation 42 is uniformly applied to the connection surfaces 24 and 40 at the same distance L. Can be welded. The distance L of the laser irradiation 42 is the same, stable laser irradiation 42 can be performed continuously, uniform welding processing can be performed, and connection reliability can be improved. Instead of the rotation of the laser irradiation device 44, as shown in FIG. 5, the capacitor element 4 may be rotated and welded with the element center 21 as the rotation center.

  One example of this terminal connection process is installed in the state of FIG. 4 as described above. In this case, the laser irradiation device 44 is rotated about the element center 21 of the capacitor element 4 by a predetermined angle θ to perform laser irradiation 42, and the anode terminal 30A and the current collector plate 14A are welded. Then, the capacitor element 4 is reversed (half rotation) and directed to the laser irradiation point 48, and the cathode terminal 30B and the connection surfaces 24 and 40 of the current collector plate 14B facing the laser irradiation device 44 are arranged. In this state, the laser irradiation device 44 is directed toward the element center 21 and rotated by the predetermined angle θ described above to perform laser irradiation 42 and perform welding.

  This laser welding process will be described with reference to FIG. FIG. 6 shows an enlarged view of the welded portion.

  As shown in FIG. 6, the connection surfaces 24 and 40 are uniformly welded, and the anode terminal 30 </ b> A (cathode terminal 30 </ b> B) and the current collector plate 14 </ b> A (14 </ b> B) are connected by the welded portion 50. During this welding, laser irradiation 42 is performed on the laser irradiation point 48, and this laser irradiation 42 is performed in an inert gas atmosphere such as argon gas.

  In addition, since the anode cover 8 (cathode part 10) on the capacitor element 4 side is covered with the element cover part 26 on the current collector plates 14A and 14B, the anode part 8 (from the flying object generated by laser irradiation 42 or laser welding) The cathode part 10) and the capacitor element 4 can be protected.

  FIG. 7 is referred to for the electric double layer capacitor 2 having such a terminal connection structure. FIG. 7 shows an example of an electric double layer capacitor.

  In the electric double layer capacitor 2 shown in FIG. 7, the capacitor element 4 is inserted into a cylindrical outer case 52, and a sealing plate 28 integrated with the capacitor element 4 is inserted into the opening side of the outer case 52. What is necessary is just to comprise the exterior case 52 with an aluminum case, for example.

  The sealing plate 28 is held by the outer case 52 by being positioned by the throttle 54 of the outer case 52 and by curling the opening edge 56 of the outer case 52 into the sealing ring 36. The capacitor element 4 is held between the sealing plate 28 and the inner bottom surface of the outer case 52.

  In this embodiment, an insulating ring 58 is provided between the element end face 6 of the capacitor element 4 and the sealing plate 28. The insulating ring 58 covers the peripheral surfaces of the current collector plates 14A and 14B and the vicinity thereof, so that the exterior case 52 and the capacitor element 4 are insulated.

[Second Embodiment]

  FIG. 8 is referred about the terminal connection method and terminal connection apparatus of the electric double layer capacitor which concern on 2nd Embodiment. FIG. 8 shows an example of a terminal connection method and a terminal connection device for an electric double layer capacitor.

  A terminal connection device 60 shown in FIG. 8 includes laser irradiation devices 44 </ b> A and 44 </ b> B and a rotating disk 62. The laser irradiation devices 44A and 44B are set at the same distance from the element center 21 described above. The rotating disk 62 is a means for positioning and rotating the capacitor element 4. On the upper surface of the rotating disk 62, a pair of chuck portions 64 that position and fix the capacitor element 4 are arranged in the diameter direction of the rotating disk 62.

  When such a terminal connection device 60 is used, each of the laser irradiation devices 44A, 44A, while rotating the rotating disk 62, in which the capacitor element 4 is positioned and fixed, from the position shown in FIG. Laser irradiation 42 may be performed from 44B.

  And what is necessary is just to stop in the position which rotated the rotation disk 62 only by rotation angle (theta) (FIG. 4) set to the welding range, as shown to B of FIG.

  If such a welding method and a welding apparatus are used, two places can be welded simultaneously in a predetermined welding time, and the welding process can be speeded up.

[Other Embodiments]

  (1) Although the anode terminal 30A and the cathode terminal 30B are illustrated as the terminal members in the above embodiment, the terminal plate is provided between the anode terminal 30A and the cathode terminal 30B and the current collector plates 14A and 14B. There may be.

  (2) In the above embodiment, laser welding is exemplified as the welding means. However, any welding method that irradiates welding energy may be used. For example, electron beam welding may be used.

  (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 capacitor element 4 is fixed at the center, and the two laser irradiation devices 44A and 44B are provided corresponding to the welding locations, so that each laser irradiation device 44A and 44B is individually set at a predetermined angle θ. However, the present invention is not limited to the configuration in which the welding is performed only by rotating. It is good also as a structure which equips the laser irradiation apparatus 44 corresponding to the several welding location of the capacitor | condenser element 4, scans this laser irradiation device 44 to a welding location, and welds a several welding location with a single laser irradiation apparatus.

(5) In the above embodiment, the anode portion 8 and the cathode portion 10 are provided on one element end face 6 of the capacitor element 4, but the present invention is not limited to this. For example, an anode portion 8 is formed on one element end face 6 of the capacitor element 4, a cathode section 10 is formed on the other element end face, and a current collecting plate 14 A is installed on the anode section 8, and a current collecting plate 14 B is installed on the cathode section 10. Also good.

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 terminal connection method of the present invention contribute to simplification of the terminal connection and connection process, and can increase productivity and reliability, which is beneficial.

2 Electric double layer capacitor 4 Capacitor element 6 Element end face 8 Anode part 9 Notch 10 Cathode part 11 Electrode protruding part
13 Current collector plate welded portions 14A and 14B Current collector plate 20 Terminal welded portion 21 Element center 22 Terminal installation surface portion 24 First connection surface 26 Element cover portion 28 Sealing plate 30A Anode terminal 30B Cathode terminal 40 Second connection surface 42 Laser Irradiation 44, 44A, 44B Laser irradiation device 46 Laser emitting portion 48 Laser irradiation point 50 Welding portion 52 Exterior case 60 Terminal connection device 62 Rotating disk

Claims (7)

A capacitor element comprising an anode and a cathode;
A current collector plate installed on an element end surface of the capacitor element and connected to an anode or a cathode, and having a first connection surface having an arc shape in a side surface direction of the capacitor element;
Have a first connecting surface and the concentric second connection surface of the collector plate, is welded to the first connecting surface connecting surface of the second matches the second connecting face a terminal member that are connected to the collector plate,
A capacitor which is characterized in that example Bei the.   2. The capacitor according to claim 1, wherein the first connection surface and the second connection surface are concentric surfaces with reference to an element center of the capacitor element.   3. The capacitor according to claim 1, wherein the current collector plate includes a cover portion covering an element end face of the capacitor element along the first connection surface. 4. The current collector plate includes a plurality of the first connection surfaces that are concentric with respect to the element center of the element end surface, and is disposed on a plurality of electrode portions formed on the same end surface of the capacitor element. 4. The capacitor according to claim 1, wherein the capacitor is characterized in that: On the current collector plate installed on the element end surface of the capacitor element and connected to the anode side or the cathode side, an arc-shaped first connection surface is formed in the side surface direction of the capacitor element;
Forming a second connection surface concentrically with the connection surface of the current collector plate on the terminal member connected to the current collector plate;
The capacitor element or the welding is performed by aligning the first connection surface and the second connection surface and using a welding means for irradiating the capacitor element or the first connection surface and the second connection surface with a beam. Rotate the means,
A capacitor terminal connection method comprising: welding the first connection surface and the second connection surface to connect the current collector plate and the terminal member. Forming the first connection surface and the second connection surface in concentric circles with reference to the element center of the capacitor element;
The capacitor terminal connection method according to claim 5, wherein the capacitor element or the welding means is rotated with the element center as a rotation center.   7. The capacitor according to claim 5, wherein the current collector plate is a current collector plate in which a cover portion that covers an element end surface of the capacitor element along the connection surface of the first is formed.

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