JPS60132315A - Chip type electrolytic condenser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a chip type electrolytic capacitor.

In a conventional chip type electrolytic capacitor, as shown in Fig. 1, an anode lead 2 led out from a capacitor element 1 is inserted into an elastic sealing body 3, and a cathode lead 4 led out from a capacitor element 1 is inserted into a metal case. The capacitor element 1 was housed in a metal case 5 by welding to the bottom of the metal case 5, and after the sealing part was sealed by rolling, the capacitor element 1 was molded and packaged with resin.

6 is an anode terminal, 7 is a cathode terminal, and 8 is an exterior resin such as epoxy. However, the above-mentioned chip type electrolytic capacitor has the disadvantage that the manufacturing process is complicated and expensive. For this reason, various attempts have been made, such as using a resin case instead of the internal metal case or applying liquid resin, but since the capacitor element is impregnated with electrolyte, the structure becomes complicated, and it has not been possible to achieve sufficient airtightness. There were problems such as electrolyte leakage and cracks in the exterior resin.

The present invention solves the above-mentioned problems and provides a chip-type electrolytic capacitor with high productivity and reliability.

The present invention will be explained below with reference to embodiments shown in FIGS. 2 to 5.

Figure 2 shows a capacitor element 9 in which an anode electrode foil and a cathode electrode foil are wound facing each other with a separator such as electrolytic paper interposed therebetween, and this is flattened and impregnated with an electrolyte. 10 is connected to the anode electrode foil. The anode lead lead 11 is a cathode lead lead connected to the cathode electrode foil.

Next, as shown in FIG.
Weld the wire 11. In this case, the anode terminal 12 and the cathode terminal 13 are formed into a frame shape by punching a single solderable metal plate so that a plurality of anode terminals 12 and cathode terminals 13 are arranged facing each other with a predetermined space between them. . Then, the capacitor element 9 is placed in the upper and lower two concave unfilled soft rubbers 14a and 14b, and this is pressurized and heated by the jig 15 and I6.
4b is applied together to seal the capacitor element 9.

In addition, non-liquid soft rubber 14. a, 14b are E P I
) M (ethylene pro and diene monomer), EPM (
EPT (ethylene propylene monomer) etc.
An electrolytic solution such as ethylene propylene terpolymer (ethylene propylene terpolymer) rubber, IIR (isobutylene isobutyne rubber), etc. that does not cause any adverse effects is used.

Next, as shown in FIG. 4, an exterior resin I7 such as epoxy resin is coated by transfer molding, and the anode terminal 12 and cathode terminal 13 are cut to predetermined dimensions and bent to complete the process.

Reference numeral 18 denotes a gap for allowing the capacitor element 9 to breathe.

The chip type electrolytic capacitor of the present invention is manufactured as described above.

Therefore, the capacitor element 9
The exposed portion of the cathode drawer door 11 is covered with unliquidized soft rubber, and when heated, it comes into close contact with the liquid and is therefore reliably sealed.

Therefore, there are no accidents such as leakage of the electrolytic solution impregnated into the capacitor element 9 or cracking of the exterior resin, and a chip-type capacitor with stable electrical properties, especially loss and capacitance, and high heat resistance and airtightness can be obtained. . The shape and hardness of the unliquid soft rubber can be selected as appropriate depending on the size of the product to which it is applied, and it is also possible to use a plurality of continuous sheets, or to use a combination of sheet rubber and unliquid soft rubber. .

The table also shows the ratings for the inventive product and conventional product, respectively: 16V and 1OμF.
The results of immersing a chip-type electrolytic capacitor into molten solder at 260° C. to check for leakage are shown below.

The numbers in the table are the number of defects/number of tests.

Table 5 does not show the results of a high-temperature load test in which the product of the present invention and the conventional product were continuously energized at a temperature of 85° C. by applying a rated voltage.

As is clear from the table and FIG. 5, it was demonstrated that the chip-type electrolytic capacitor of the present invention has extremely excellent heat resistance and reliability.

As described above, the chip type electrolytic capacitor of the present invention is constructed by sealing a capacitor element impregnated with an electrolytic solution with unliquid soft rubber and then covering the capacitor element with a resin. It is extremely useful in many aspects, and has great industrial and Tenkawa value.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional chip-type electrolytic capacitor, Figure 2
The figure is a perspective view of a chip-type electrolytic capacitor element according to the present invention, FIG. 5 is a cross-sectional view of the chip-type electrolytic capacitor of the present invention, and FIG. 5 is a high-temperature load test example of the chip-type electrolytic capacitor comparing the product of the present invention and a conventional product. (A) is a capacitance change rate over time characteristic diagram;
(b) is a loss-time characteristic diagram. 9: Capacitor element 14.14 a, 14b: Unliquid soft rubber 17: Exterior resin Patent applicant Nippon Capacitor Industries Co., Ltd. Figure 2 Figure 4 Figure 5 (Method) % formula % 1゜Indication of case 1982 Patent application No. 2415011″32, title of invention Chip-type electrolytic capacitor 3 Relationship with supplementary person case Patent applicant

Claims (1)

[Claims] A chip-type electrolytic capacitor characterized in that a capacitor element impregnated with an electrolytic solution is sealed with unfilled soft rubber and then covered with a resin.