JPS6328598Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an electrolytic capacitor in which the fixing strength between the electrode tab pulled out from the electrolytic capacitor element and the sealing body is increased.

[Conventional technology]

FIG. 1 shows a conventional electrolytic capacitor. This electrolytic capacitor has a shorter length than its diameter. That is, the anode-side or cathode-side electrode tabs 4 and 6 pulled out from one end surface of the electrolytic capacitor element 2 penetrate the through hole 12 of the sealing body 10 that seals the exterior case 8 and are pulled out to the outside. There is. The sealing body 10 of this electrolytic capacitor is formed of an elastic insulator such as rubber, and a hard synthetic resin plate 16 is formed on the surface layer of the sealing body 10, leaving the elastic insulator at the peripheral edge and the edge of the through hole 12. is integrally embedded.

The electrode tabs 4 and 6 used in this type of electrolytic capacitor are made by leaving a part of a rod-shaped material made of aluminum, which is the same type of metal as the electrode foil, as the columnar part 14A, and forming the other part into a plate shape. A solderable metal wire 18 is connected to one end of the columnar portion 14A by fixing means such as welding. FIG. 2 shows the vicinity of the electrode tabs 4 and 6 pulled out from the electrolytic capacitor element 2.

[Problem that the invention attempts to solve]

By the way, in such an electrolytic capacitor, as shown in FIG.
4B, the columnar portion 14A is placed inside the electrolytic capacitor element 2. Therefore, when a force is applied to the electrode tabs 4, 6 in the directions of arrows A and B due to bending of the metal wire 18, etc., the force will push the electrode tabs 4, 6 in the direction shown by arrow C or There is a risk that the adhesion between the flat portion 14B and the electrode foil inside the electrolytic capacitor element 2 may loosen or a portion of the electrode foil may be damaged, thereby destroying the electrical connection. Normally, the metal wire 18 is bent in accordance with its mounting form, so a considerably large force acts inside the electrolytic capacitor element 2, causing the connection between the electrode tabs 4 and 6 and the electrode foil to become disconnected. This may cause problems such as not being able to maintain sufficient electrical characteristics.

In view of this, this invention increases the fixing strength between the electrode tab and the sealing body so that stress on the electrode tab does not affect the electrolytic capacitor element.

[Means for solving problems]

In the electrolytic capacitor of this invention, the electrode tab connected to the electrolytic capacitor element is provided with a flat part that is continuous with the columnar part that projects from the end face of the electrolytic capacitor element, and this flat part is connected to the electrode foil of the electrolytic capacitor element. At the same time, a part of the columnar part side is exposed from the end face of the electrolytic capacitor element, and the shoulder of the exposed flat part is inserted into the through hole of the elastic sealing body together with the columnar part to close the inner wall of the through hole. It is something that is made to penetrate.

[Effect]

With this configuration, the exposed flat part of the electrode tab connected to the electrode foil is inserted into the through hole of the sealing body together with its columnar part, and the flat part is inserted into the inner wall of the through hole of the sealing body which has elasticity. Since the shoulder part of the part bites in, this serves as a rotation stopper and fixes the electrode tab to the sealing body. As a result, the force acting on the electrode tab is blocked by the sealing body, and the influence on the electrolytic capacitor element side can be prevented.

〔Example〕

An embodiment of this invention will be described in detail with reference to the drawings.

Figures 3 to 8 show examples of the electrolytic capacitor of this invention, in which Figure 3 shows the state of connection between the electrode tab and the electrode foil, Figure 4 shows the electrolytic capacitor element with the electrode tab pulled out, and Figure 5 shows the electrolytic capacitor element with the electrode tab pulled out. The figure shows a cross section of the sealing body, FIG. 6 shows a longitudinal cross section of the electrolytic capacitor, FIG. 7 shows an enlarged cross section of the lead-out portion of the electrode tab, and FIG. 8 shows a cross section taken along the line - in FIG.

The electrode foil 20 on the anode side or the cathode side has a flat part 14B whose flat surface is in the axial direction of the electrode tabs 4 and 6 on the anode side or the cathode side. It is made to protrude from the edge of the separator paper 22, which is wider than the foil 20, and is electrically connected by fixing means such as welding. When the electrode foil 20 on the anode side or the cathode side to which the electrode tabs 4 and 6 are connected in this way is wound together with two sheets of separator paper 22 interposed between both electrode foils, an electrolytic capacitor element 2 as shown in FIG. 4 is obtained. is formed. Therefore, on the end face of the electrolytic capacitor element 2 covered with the ears of the separator paper 22, the columnar parts 1 of the electrode tabs 4 and 6 are attached.
4A and the shoulder portion 1 of the flat portion 14B in its vicinity
4C becomes prominent.

Further, as shown in FIG. 5, the sealing body 10 is formed of an elastic insulator such as rubber, and a hard synthetic resin plate 16 is integrally embedded in the upper surface of the sealing body 10 with a part of the elastic insulator exposed. It is rare. Through holes 24 passing through the electrode tabs 4 and 6 are formed at regular intervals in the exposed portion of the elastic insulator of the sealing body 10 thus formed. The shape of this through hole 24 is a cylindrical shape that matches the outer shape of the columnar part 14A to the shoulder part 14C of the flat part 14B of the electrode tabs 4 and 6, and the diameter increases near the opening and through the tapered surface. .

If the sealing body 10 is formed in this way, as shown in FIGS. 6 to 8, the through holes 24 of the sealing body 10
The flat part 1 is penetrated by the columnar parts 14A of the electrode tabs 4 and 6 pulled out from the end face of the electrolytic capacitor element 2 into the interior of the flat part 1 due to the elasticity of the sealing body 10.
4A bites into the inner wall surface of the through hole 24, and the sealing body 1
It is firmly fixed at 0. Therefore, the metal wire 18
When bending stress or rotational force is applied to the columnar portion 14A due to bending or the like, the shoulder portion 1 of the flat portion 14B
Since 4C bites into the inner wall surface of the sealing body 10 and is firmly fixed to prevent rotation, the stress is stopped inside the sealing body 10. Therefore, it is possible to prevent inconveniences such as electrical connection with the electrode foil being broken due to bending of the electrode tabs as in the prior art, and the metal wires 18 of the electrode tabs 4 and 6 can be bent freely. Even if it is bent, the reliability of the electrical connection will not be compromised.

In the above embodiment, the through hole 24 formed in the sealing body 10 had a circular cross section matching the shape of the electrode tabs 4 and 6 in order to facilitate insertion of the electrode tabs 4 and 6. As shown in FIG. 9, if the openings are shaped to match the outer shapes of the columnar portion 14A of the electrode tabs 4, 6 and the shoulder portion 14C of the flat portion 14B, the insertion position of the electrode tabs 4, 6 can be adjusted. is fixed,
The electrode tabs 4 and 6 can be more firmly fixed to the sealing body 10.

[Effect of idea]

As explained above, according to this invention, a part of the flat part of the electrode tab is exposed from the electrolytic capacitor element, a part of this flat part is inserted into the through hole of the sealing body together with the columnar part, Since the shoulder of the flat part bites into the inner wall of the through hole of the elastic sealing body, this prevents rotation, and the electrode tab is securely and firmly fixed to the sealing body, and the flat part of the electrode tab and The electrical connection state with the electrode foil can be protected, and the reliability of the connection can be maintained at a high level.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional electrolytic capacitor, Figure 2 is a cross-sectional view of a conventional electrolytic capacitor.
The figure is a sectional view showing the drawn-out portion of the electrode tab in the electrolytic capacitor element, FIG. 3 is a perspective view showing the fixed state of the electrode tab in an embodiment of the electrolytic capacitor of this invention, and FIG. 5 is a side view showing the connection between the electrode tab and the electrolytic capacitor element in the electrolytic capacitor shown in FIG. 5; FIG. 5 is a sectional view showing the sealing body in the electrolytic capacitor shown in FIG.
FIG. 6 is a sectional view showing an embodiment of the electrolytic capacitor of this invention, FIG. 7 is a sectional view showing the lead-out portion of the electrode tab in the electrolytic capacitor element shown in FIG. 6, and FIG. 9 is a sectional view showing another embodiment of the electrolytic capacitor of this invention. 2... Electrolytic capacitor element, 4, 6... Electrode tab, 10... Sealing body, 14A... Columnar part, 14
B... Flat part, 14C... Shoulder part.

Claims (1)

[Scope of utility model registration request] The electrode tab connected to the electrolytic capacitor element is provided with a flat part that is continuous with the columnar part that protrudes from the end face of the electrolytic capacitor element, and this flat part is connected to the electrode foil of the electrolytic capacitor element, and the electrode tab on the columnar part side is connected to the electrode foil of the electrolytic capacitor element. An electrolytic capacitor formed by exposing a part of the electrolytic capacitor element from the end face, and inserting the shoulder of the exposed flat part into a through hole of an elastic sealing body together with the columnar part so that it bites into the inner wall of the through hole. .