CN102064022B - Stress absorption device at anode terminal of solid electrolytic capacitor - Google Patents

Abstract

A stress absorbing device for the anode end of a solid electrolytic capacitor is a solid electrolytic capacitor with a plurality of stacked capacitor elements, the capacitor elements are stacked on the anode terminal and the cathode terminal as conductive contacts, and the capacitor is sealed by packaging materials such as synthetic resin Components, anode terminals and cathode terminals are packaged; among them, conductive glue is provided between the cathodes of adjacent capacitor elements and on the outside of the cathode, and insulating glue is provided on the inside of the cathode, relying on the conductive glue, insulation The glue connects and fixes the laminated capacitor elements; in addition, another insulating glue is coated at or near the junction of the anode and the cathode of each capacitor element, which is used to absorb the junction base of the anode and the cathode or the junction of the anode and the cathode during anode welding and packaging. The tensile stress and bending stress generated by the nearby external force reduce the bending deformation of this part, and solve the problem that the thickness of the cathode base and end of the solid electrolytic capacitor is different, and even damage the anode and cathode.

Description

Stress absorbing device for anode terminal of solid electrolytic capacitor

technical field

The present invention relates to a stress absorbing device for the anode end of a solid electrolytic capacitor, in particular to a solid electrolytic capacitor that can absorb the tensile stress and stress caused by external force at the junction of the anode and the cathode or its vicinity when the anode is welded and packaged. Anode end stress absorber for bending stress.

Background technique

Shown in Fig. 1A, 1B is existing solid electrolytic capacitor, as the No. I283878 of Taiwan Patent Case Announcement, its solid electrolytic capacitor 10 contains the capacitor element 6 of a plurality of laminations, is positioned at the following of the capacitor element 6 of stacking bottom layer An anode terminal 12 and a cathode terminal 13 are installed; the capacitor element 6 , the anode terminal 12 and the cathode terminal 13 are covered with a synthetic resin 14 except for the lower surfaces of the anode terminal 12 and the cathode terminal 13 .

Fig. 1 B is above-mentioned capacitor element 6, has dielectric oxide film 2 and cathode layer 3 on the surface of the aluminum foil 1 that has valve effect as anode body and itself is metal; This cathode layer 3 is made of polythiophene (polythiophene) The solid electrolyte layer 3a, carbon layer 3b, and silver paint layer 3c made of conductive polymer; the part where the cathode layer 3 is formed on the dielectric oxide film 2 is the cathode 8, and the cathode layer 3 is not formed The part is the anode 7; in the case of this multi-chip capacitor element 6 stacked, the anode 7 of the adjacent capacitor element 6 is welded and fixed, and the cathode 8 of the adjacent capacitor element 6 is connected with a conductive connecting agent 18 The connection is fixed, thereby forming the laminated solid electrolytic capacitor 10 .

In the vicinity of the boundary 15 between the cathode 8 and the anode 7 on the bottom surface of the anode terminal 12 of the anode 7, a first stress relaxation slit 16 and a second stress relaxation slit 17 are provided. Due to the two stress relieving slits 16 and 17, the anode 7 is bent at the two stress relieving slits 16 and 17. Since the application of bending stress is suppressed at or near the boundary 15 between the anode 7 and the cathode 8, the stress applied to this portion becomes small. However, although the solid electrolytic capacitor 10 of this patent can be bent by relying on the two stress relaxation slits 16 and 17, the application of bending stress at or near the junction 15 of the anode 7 and the cathode 8 is suppressed, but the laser cutting stress is increased. Ease the production procedure of slits 16 and 17, resulting in production cost can not be reduced, and time-consuming and labor-intensive.

In order to save the manufacturing procedure of the slits 16, 17, the general anode is made as shown in Figure 1C, but this structure leads to: after the capacitor element is laminated, the thickness of the end and the base of the cathode is different, and even the anode and the base are different in thickness. / Or the cathode is damaged, causing the problem of lower pass rate and higher cost.

Contents of the invention

The purpose of the present invention is to rely on the manufacturing experience and technical accumulation of existing capacitors, carefully study solutions to the above problems, and after continuous research, testing and improvement, a stress absorbing device for the anode end of a solid electrolytic capacitor is proposed. to solve the above problems.

The purpose of the present invention is to provide a stress absorbing device at the anode end of a solid electrolytic capacitor, by utilizing the elasticity of the insulating glue, absorbing the tensile stress and the external force generated at the boundary between the anode and the cathode or near it during manufacture. bending stress.

In order to achieve the above object, the stress absorbing device of the anode end of the solid electrolytic capacitor of the present invention has a plurality of laminated capacitor elements, the capacitor elements are laminated on the anode terminal and the cathode terminal as conductive contacts, and are made of synthetic resin The capacitor element, the anode terminal and the cathode terminal are packaged with other packaging materials; among them, the cathodes of adjacent capacitor elements are provided with conductive glue on the outside of the cathode, and in addition, the inside of the cathode is provided with insulating glue. Conductive glue and insulating glue connect and fix the stacked capacitor elements with each other; in addition, another insulating glue is coated at or near the junction of the anode and cathode of each capacitor element to absorb the junction of the anode and the cathode during anode welding and packaging The tensile stress and bending stress generated by external force at the base or its vicinity reduce the bending deformation of this part, and solve the problem that the thickness of the cathode base and end of the solid electrolytic capacitor is different, and even damage the anode and cathode.

The stress absorption device for the anode end of the solid electrolytic capacitor of the present invention, the important purpose of the present invention is that the stress generated by the external force on the cathode and the anode during manufacture will be greatly reduced, the deformation of the two will be reduced, and will not be damaged. The pass rate can be greatly increased.

Description of drawings

The accompanying drawings are used to provide further understanding of the present invention, and constitute a part of the specification, and are used to illustrate the present invention.

The examples are used together to explain the present invention, but not to limit the present invention. In the attached picture:

1A-1C are schematic cross-sectional views of existing solid electrolytic capacitors;

Fig. 2 is the cross-sectional schematic view of the stress absorbing device of solid electrolytic capacitor anode end of the present invention;

3 is a schematic cross-sectional view of the capacitor element unit of the stress absorbing device at the anode end of the solid electrolytic capacitor of the present invention;

4 is a schematic cross-sectional view of an embodiment of a stress absorbing device at the anode end of a solid electrolytic capacitor of the present invention;

5A and 5B are schematic cross-sectional views of an embodiment of the stress absorbing device at the anode end of the solid electrolytic capacitor according to the present invention.

In conjunction with the accompanying drawings, the reference signs in the embodiments of the present invention are as follows:

2-dielectric oxide film; 3-cathode layer; 3a-solid electrolyte layer; 3b-carbon layer; 3c-silver paint layer; 6-capacitor element; 8-cathode; 7-anode; 10-solid electrolytic capacitor; 12 -anode terminal; 13-cathode terminal; 14-synthetic resin; 15-junction; 16-1st stress relief slot; 17-2nd stress relief slot; 18-conductive connector; 30-solid electrolytic capacitor; 32 - anode terminal; 33 - cathode terminal; 34 - synthetic resin; 35 - junction base; 37 - conductor; 36 - capacitor element; 361 - conductor; 362 - dielectric oxide film; 363 - cathode layer; 363a - solid Electrolyte layer; 363b-carbon layer; 363c-silver paint layer; 367-anode; 368-cathode; 50-conductive glue; 70-insulating glue; 70a-another insulating glue.

Detailed ways

The preferred embodiments of the invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

The present invention is a stress absorbing device for the anode end of a solid electrolytic capacitor. As shown in FIGS. On the terminal 33 ; the sealing material synthetic resin 34 covers the capacitor body composed of the capacitor element 36 , the anode terminal 32 and the cathode terminal 33 .

Described capacitor element 36 units are as shown in Figure 3, are formed with dielectric oxide film 362 and cathode layer 363 on the surface of metal conductor 361 as anode; The preferred composition of this cathode layer 363 is: A solid electrolyte layer 363a, a carbon layer 363b, and a silver paint layer 363c made of a polythiophene conductive polymer; the part where the cathode layer 363 is formed on the dielectric oxide film 362 is the cathode 368, and the cathode 368 is not formed. The part of the layer 363 is the anode 367; the capacitor elements 36 with this structure are stacked multiple times, and then the anodes 367 of the adjacent capacitor elements 36 are welded and fixed. And between the cathodes 368 of adjacent capacitor elements 36, and between the capacitor element cathode and the cathode terminal at the bottom, it is provided with silver glue, silver alloy glue or conductive glue 50 of other materials on the side of the cathode end. One side of the base of the cathode is provided with an insulating glue 70 , and the stacked capacitor elements 36 are connected and fixed by the conductive glue 50 and the insulating glue 70 , thereby forming a stacked solid electrolytic capacitor 30 .

In the bottom surface of the anode terminal 32 of the anode 367, near the junction 35 between the cathode 368 and the anode 367, an insulating glue 70a is coated, relying on the elasticity of the insulating glue 70a and the insulating glue 70, when the anode terminal end is connected by welding When the parts are connected or when a force is applied to the bent and concentrated anode terminal package, the external force can be absorbed, thereby reducing the stress generated by the anode and the cathode. It is possible to suppress the increase of the leakage current of the capacitor caused by the damage of the anode 367 at or near the junction 35 of the anode 367 and the cathode 368 due to external force, and the defect caused by a short circuit. In addition, due to the effect of the conductive glue and insulating glue provided on the lower side of the cathode, the present invention does not cause the cathode to bend and cause the anode terminal to be connected by welding or to apply force to the bent and concentrated anode terminal and the cathode package. A situation where the thickness at both ends is different.

As shown in Figure 4, this figure is a schematic cross-sectional view of another embodiment of the stress absorbing device at the anode end of the solid electrolytic capacitor of the present invention. In this embodiment, the solid electrolytic capacitor 30 has a plurality of stacked capacitor elements 36, and the capacitor elements 36 are stacked On the anode terminal 32 and the cathode terminal 33 as conductive contacts; the other side of the anode terminal 32 and the cathode terminal 33 is also provided with another group of multiple stacked capacitor elements 36, and then the capacitor elements 36 are encapsulated by synthetic resin 34 and other packaging materials. , The capacitor body composed of the anode terminal 32 and the cathode terminal 33 is covered.

The capacitor elements 36 constructed in this way are laminated in multiple layers, and then the anodes 367 of the adjacent capacitor elements 36 are welded and fixed to each other. Wherein, below the cathode 368 of each capacitor element 36, silver glue, silver alloy glue or other conductive glue 50 is arranged on the side near its end, and insulating glue 70 is arranged on the side near its base. The glue 50 and the insulating glue 70 connect and fix the stacked capacitor elements 36 to each other on the cathode terminal, thereby forming the stacked solid electrolytic capacitor 30 .

In the bottom surface of the anode terminal 32 of the above-mentioned anode 367, the vicinity of the junction base 35 between the cathode 368 and the anode 367 is coated with insulating glue 70a, relying on the effect of the insulating glue 70a and the above-mentioned insulating glue 70, when the anode ends are connected by welding Or when the package exerts force on the bent and concentrated anode terminal, it can absorb the external force applied to the junction of the anode 367 and the cathode 368 or its vicinity, thereby reducing the stress generated by the anode and the cathode. As a result, the increase of leakage current of the capacitor caused by external force damage to the anode 367 at or near the junction 35 of the anode 367 and the cathode 368, and defects caused by short circuit can be suppressed, and the yield rate is greatly improved.

As shown in Figures 5A and 5B, a conductor 37 of any metal alloy material can be placed between the anodes 367 of each capacitor element 36, and then the end of the anode 367 and the conductor 37 are connected to the anode terminal 32 by welding. Above all, this connection method can absorb external force and reduce the stress generated by the anode and cathode when welding is used to connect the ends of the anode terminal or when a force is applied to the package of the anode terminal.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. the stress absorption device of a solid electrolytic capacitor anode tap, that kind of solid electrolytic capacitor has a plurality of stacked capacitor elements, described capacitor element is on the anode terminal and cathode terminal that is laminated in as conductive junction point, and coated by the capacitor body that the encapsulating materials such as synthetic resin consist of capacitor element, anode terminal and cathode terminal, it is characterized in that:

Between the negative electrode of adjacent described capacitor element, and be provided with conducting resinl and the first insulating cement between capacitor element and the cathode terminal, rely on described conducting resinl and described the first insulating cement to be connected to each other stacked capacitor element fixing, near the boundary base portion of the anode of each capacitor element and negative electrode or its, be coated with the second insulating cement again, utilize the elasticity of the second insulating cement and described the first insulating cement, absorb during fabrication capacitor element, anode and negative electrode because of the stress that externally applied forces produces, avoid capacitor element to sustain damage and be out of shape.

2. the stress absorption device of described solid electrolytic capacitor anode tap according to claim 1, it is characterized in that, the outer conducting resinl that is coated with of the negative electrode of described capacitor element is one section that is located near the end of negative electrode, and insulating cement is one section that is located near the base portion of negative electrode.

3. according to claim 1 or the stress absorption device of 2 described solid electrolytic capacitor anode taps, it is characterized in that, the main material of described conducting resinl is silver or silver alloy glue.

4. according to claim 1 or the stress absorption device of 2 described solid electrolytic capacitor anode taps, it is characterized in that, wherein the top and following symmetric position place of anode terminal and cathode terminal respectively is provided with one group of stacked capacitor element, described stacked capacitor element and anode terminal and cathode terminal and downlink connection.

5. the stress absorption device of described solid electrolytic capacitor anode tap according to claim 4 is characterized in that, the main material of described conducting resinl is silver or silver alloy glue.

6. the stress absorption device of described solid electrolytic capacitor anode tap according to claim 1 is characterized in that, can be lined with conducting objects between the anode of described each capacitor element.

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