JPH0351963Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a capacitor element made into a flat shape by winding an anode foil and a cathode foil through a separator and pressing them together, or a capacitor element which is made into a flat shape from the beginning. This invention relates to a flat electrolytic capacitor that is formed by storing a capacitor element wound around the capacitor element together with a sealing member in a flat case.

[Conventional technology]

Flat electrolytic capacitors are suitable for mounting in narrow spaces, and Figures 4 and 5 show a conventional flat electrolytic capacitor 1.
shows the structure of

The capacitor element 2 constituting this flat electrolytic capacitor 1 is made into a flat shape by winding an anode foil and a cathode foil made of aluminum foil with a separator made of electrolytic paper interposed therebetween, and pressing this. Those that are already formed or those that are wound in a flat shape from the beginning are used.

In this case, the outer periphery of the capacitor element 2 is wrapped around the separator or other insulating tape to maintain an electrically insulated state.

The case 3 in which the capacitor element 2 is housed has a flat bottomed cylindrical shape with an opening on one side, and is made of aluminum or the like.

The capacitor element 2 is impregnated with a required electrolyte and then stored in the flat case 3 together with a sealing body 4 made of a rubber material.

An annular drawn part 31 is provided around the circumferential surface of the corresponding part of the case 3 where the stored sealing body 4 is located, and if necessary, an annular drawing part 31 is provided at the open end of the case 3, which is bent into a curled shape. A curled portion 32 may also be formed.

In addition, a concave surface 33 is formed on the flat side surface of the case 3 located on the flat surface side, extending from the opening to the bottom for the purpose of suppressing swelling of the capacitor element 2 and fixing the capacitor element 2. .

Furthermore, an explosion-proof groove 34 consisting of a single groove is provided in this concave surface 33;
can also be formed on the bottom surface 35 of the case 3.

Furthermore, the lead wires 21 and 22 drawn out from the capacitor element 2 are led out to the outside through through holes 41 and 42 formed in the sealing body 4.

[Problems that this invention attempts to solve]

In the conventional flat electrolytic capacitor 1 formed in this manner, although the annular drawn portion 31 is formed in the sealing body portion of the case 3, the case 3 itself is flat. Therefore, the sealing strength of the case 3 in the transverse (minor axis) direction B-B is relatively reduced with respect to the longitudinal (long axis) direction A-A of the case 3.

For this reason, for example, the drawing part 31 of the case 3
The inner wall surface of the case 3 and the sealing body 4 may be damaged due to buckling due to elastic deformation of the capacitor element 2, swelling of the capacitor element 2, or increase in internal pressure within the case 3.
A slight gap is created between the flat electrolytic capacitor 1 and the electrolytic solution leaked to the outside through this gap, making it difficult to extend the life of the flat electrolytic capacitor 1.

[Means for solving problems]

However, the present invention provides a flat electrolytic capacitor in which a sealing reinforcing metal fitting for crimping and clamping the opening of the case from the outside is attached to the opening side of the case. The aim is to improve the airtightness between the two.

〔Example〕

Hereinafter, embodiments of the present invention will be explained in detail based on FIGS. 1 to 3. In the present invention, the same parts as in the conventional example will be explained using the same reference numerals.

FIG. 1 is a side cross-sectional view showing an embodiment of a flat electrolytic capacitor 1A according to the present invention, and is basically a flat electrolytic capacitor 1 shown as a conventional example.
Case 3, which has a flat bottomed cylindrical shape, is similar to
A structure is adopted in which a flat capacitor element 2 impregnated with a required electrolyte is housed together with a sealing body 4 inside.

Furthermore, a pair of sealing reinforcing metal fittings 5 are attached to the opening 37 side of the case 3 for crimping and clamping from the outside.

These sealing reinforcement fittings 5 are attached to a top plate portion 5 for covering the opening 37 side of the case 3, as shown in FIG.
1 and side plate portions 52, 52 that abut against the respective flat surfaces 36, 36 of the case 3, each having a U-shape in cross section.

In addition, by bending the lower edges of these side plate parts 52, 52 toward opposite sides, each of the lower edges of the side plate parts 52, 52 can be engaged with the drawing part 31 provided around the corresponding part of the case 3 where the sealing body 4 is located. Contact locking part 5 that can
3,53 is formed.

Further, lead wires 21 and 22 are provided on the top plate portion 51.
A notch 54 is formed to form a through hole when the parts are led out and installed in a pair.

Since the present invention is configured in this way, the sealing reinforcing metal fitting 5 is attached to the case 3 in the third step.
As shown in the figure, prepare two sealing reinforcing metal fittings 5,
This is done by placing the opening sides of the notches 54 facing each other, and engaging the abutting and locking parts 53 with the drawing part 31 from each side of the case 3 in the longitudinal direction, and introducing each part separately.

At that time, the installed state is to weld the sealing reinforcement metal fitting 5.
The sealing reinforcing metal fitting 5 may be fixed to the case 3 using an adhesive.

〔effect〕

As described above, according to the present invention, a sealing reinforcing metal fitting is attached to the opening side of the flat bottomed cylindrical case in which the flat capacitor element is housed together with the sealing body, and the flat capacitor element is crimped and clamped. This ensures airtightness between the inner wall of the case and the sealing body.
By making it strong, it is possible to provide a flat electrolytic capacitor with a long life and excellent quality characteristics without electrolyte leakage.

[Brief explanation of the drawing]

1 to 3 are diagrams for explaining the flat electrolytic capacitor according to the present invention, and among them,
Fig. 1 is a side sectional view showing the overall structure of an embodiment of the flat electrolytic capacitor according to the present invention, Fig. 2 is a perspective view showing an example of the sealing reinforcing metal fitting constituting the invention, and Fig. 3 4 is an exploded perspective view showing a conventional example, and FIG. 5 is a side sectional view showing the overall structure of the conventional example. 1, 1A... Flat electrolytic capacitor, 2... Capacitor element, 3... Case, 31... Drawn part, 36... Flat surface, 37... Opening, 4... Sealing body, 5... Sealing Reinforcement metal fittings, 51...Top plate part, 5
2...Side plate part, 53...Abutment locking part, 54...Notch part.

Claims (1)

[Scope of utility model registration request] A case formed into a flat bottomed cylindrical shape with an opening on one side, a flat capacitor element housed in the case together with a sealing body, and a case housing the sealing body and the capacitor element. A pair of sealing reinforcing metal fittings are attached to the opening side of the case, and each of the sealing reinforcing metal fittings has a top plate part that covers the opening of the case and has a notch for leading out the lead wire. and a side plate portion that comes into contact with each flat surface of the case, and the cross section is U-shaped.
The flat electrolytic capacitor is characterized in that each of the lower edges of these side plate parts is bent toward opposite sides to form an abutment locking part that engages with a drawing part provided around the case.