KR100881138B1 - Solid Electrolytic Capacitors and Manufacturing Method Thereof - Google Patents

Abstract

The present invention relates to a solid electrolytic capacitor and a method of manufacturing the same.

The solid electrolytic capacitor of the present invention includes a condenser element having a polarity of an anode; A wire coupled to one end of the condenser element to protrude; An outer molding part surrounding an outer surface of the condenser element to which the wire is coupled and an electrode terminal to form an appearance; A concave groove is formed in close contact with one side of the condenser element, and a concave groove is formed at an upper end of the condenser surface, and the free end of the wire exposed to the condenser element side is electrically coupled to the concave groove, and a lower portion thereof is centered on a central portion. A positive electrode terminal bent into close contact with the bottom surface of the exterior molding part; And a negative electrode terminal which is tightly coupled to the other side of the condenser element, the lower portion of which is bent inward with respect to the center portion to be in close contact with the lower surface of the exterior molding part, and maximizes the area occupied by the condenser element. There is an advantage to be improved.

Capacitor element, wire, positive terminal, concave groove, negative terminal, exterior molding

Description

Solid Electrolytic Capacitor and Manufacturing Method Thereof {SOLID ELECTROLYTIC CAPACITOR AND METHOD FOR PREPARINGTHE SAME}

1 is a perspective view of a conventional solid electrolytic capacitor.

2 is a cross-sectional view of a conventional solid electrolytic capacitor.

3 is a plan view of a conventional solid electrolytic capacitor.

4 is a cross-sectional view of a conventional solid electrolytic capacitor during welding.

5 is a front sectional view of another conventional capacitor.

6 is a side cross-sectional view of another conventional capacitor.

7 is a perspective view of a solid electrolytic capacitor according to the present invention.

8 is a front sectional view of a solid electrolytic capacitor according to the present invention.

9 is a side cross-sectional view of a solid electrolytic capacitor according to the present invention.

10 to 15 are cross-sectional views sequentially showing a method of manufacturing a solid electrolytic capacitor according to the present invention.

11 is a cross-sectional view showing a manufacturing process of the condensate element;

12 is a cross-sectional view of a state in which a wire is inserted into a capacitor element;

13 is a cross-sectional view of the positive terminal and the wire is coupled,

14 is a sectional view of a capacitor in which an exterior molding part is formed;

15 is a cross-sectional view of a condenser that is manufactured by bending the positive and negative terminals on the lower surface of the exterior molding part.

<Explanation of symbols for the main parts of the drawings>

10. Solid electrolytic capacitor 20. Capacitor element

30. Wire 41. Anode terminal

41a. Concave Groove 41b. Opening

42. Cathode terminal 50. Exterior molding part

The present invention relates to a solid electrolytic capacitor, and more particularly, one end of a wire is coupled to the condenser element so as to be exposed, and the positive electrode and the negative electrode contacting the side of the wire and the condenser element are mounted symmetrically with each other, and the positive electrode terminal Since the wire is seated in the concave groove formed in the bent portion of the bent portion and welded by a laser, the electrical connection between the wire and the positive terminal is strengthened to ensure the reliability of the product, and to improve the capacitance electrolytic capacitor and its manufacturing method will be.

In general, a solid electrolytic capacitor is one of electronic components used for the purpose of blocking a direct current and passing an alternating current in addition to a function of accumulating electricity. Among these solid electrolytic capacitors, a tantalum capacitor is typically manufactured.

The tantalum capacitor is used not only for general industrial devices but also for application circuits having a low rated voltage range, and is particularly used for noise reduction of circuits or portable communication devices in which frequency characteristics are problematic.

Such a capacitor is basically manufactured by inserting a lead wire into the center portion of the tantalum element or a portion other than the center portion or by bending the inserted lead wire from the outside of the tantalum element.

In addition, as a method of assembling the lead frame to the tantalum element, the anode terminal is drawn out by spot welding the anode lead wire and the anode lead frame, and the anode and cathode lead forming are formed after the mold package. ), A method of drawing out the electrode terminal is used.

Looking at the structure and the manufacturing process of the conventional capacitor manufactured in this manner in more detail as follows.

1 is a perspective view of a conventional solid electrolytic capacitor, FIG. 2 is a sectional view of a conventional solid electrolytic capacitor, FIG. 3 is a plan view of a conventional solid electrolytic capacitor, and FIG.

As shown, the conventional condenser 100 is molded in the condenser element 110, the positive and negative lead frames 130, 140 and the outer condenser element 110 connected to the condenser element 110. It is composed of an epoxy case 150.

Capacitor 100 having such a technical configuration is formed by sintering dielectric powder into a rectangular parallelepiped in the pressing process, forming a dielectric film on the outer surface during the chemical conversion process, and then impregnating the aqueous solution of manganese nitrate to solid on the outer surface. The capacitor device 110 is manufactured by forming a manganese dioxide layer made of an electrolyte.

The process of connecting the lead frames 13 and 140 of the positive electrode and the negative electrode to the condenser element 110 includes a rod-shaped positive electrode 120 inserted into a central portion of the condenser element 110 and having one side protruding to a predetermined length. And the plate-shaped anode lead frame 130 by spot welding to draw the anode terminal, and the lead frame 130 of the cathode through the conductive adhesive applied to the outer surface of the condenser element 110. It is made of a process of drawing out the negative electrode terminal by soldering.

Next, the capacitor device 110 electrically connected to the lead frames 130 and 140 of the anode and cathode, respectively, is coated with an epoxy powder on its outer surface to form an epoxy case 150, and finally, a marking process is performed. The production of the condenser 100 is completed.

However, the conventional condenser 100 manufactured in this manner requires a bending process for forming the pressure surface 122 on the outer surface of the anode wire 120 before spot welding. The dielectric layer is destroyed by the mechanical shock transmitted to the condenser element 110 through the wire 120, and the manufacturing cost increases due to the addition of the bending process.

In addition, as the wire is exposed to high temperatures in the process of welding the anode wire 120 and the anode lead frame 130 using a welding base material such as lead or tin, between the anode wire 120 and the lead frame 130. A manufacturing defect may occur that is opened.

In addition, the inner space of the epoxy case 150 set before manufacturing the capacitor 100 is relatively lowered by the coating thickness of the conductive adhesive and the thickness of the lead frame 140 of the cathode, thereby reducing the volume of the capacitor. The problem that the capacitance becomes small and the value of impedance becomes large has been pointed out.

In order to solve this problem, a bottom electrode type capacitor as shown in FIGS. 5 and 6 has been developed, but the capacitor 200 having such a structure is the anode lead frame 220 coupled to the bottom surface of the epoxy case 210. In order to connect the anode wire 240 with a reinforcing material 250 of a conductive material should be provided.

Unlike the condenser 100 described above, the condenser 200 does not require a bending process of wires, but a reinforcement 250 is inserted for connection by welding, and the reinforcement 250 is a central portion of the condenser element 260. It is bonded by spot welding with the anode wire 240 inserted in it.

At this time, there is a risk that a part of the condenser element 260 is lost due to the welding heat transmitted through the wire 240, and thus the capacitance becomes smaller.

Here, reference numeral 230 of FIGS. 5 and 6 is a negative electrode terminal, and 270 is a silver paste for electrically connecting the negative electrode terminal to a negative electrode drawing layer (not shown) outside the capacitor element.

Accordingly, the present invention was devised to solve the above-mentioned disadvantages and problems in the conventional solid electrolytic capacitor, and the positive terminal and the negative terminal are coupled to both sides of the capacitor in a symmetrical manner, and one end of the positive terminal The free end side of the wire coupled to the condenser element is seated in the concave groove formed in the part, thereby maximizing the area occupied by the condenser element by eliminating the need for a separate reinforcing material for connecting the wire and the positive terminal. It is an object of the present invention to provide a solid electrolytic capacitor and a method of manufacturing the same, which improve the bonding strength of the wire and the positive electrode terminal while improving the reliability of the electrode connection.

In addition, another object of the present invention, the one end of the wire is inserted into the inside of the concave groove formed on one end of the positive electrode terminal, the positive electrode terminal and the wire due to melting the upper end of the concave groove during laser welding to the wire and the concave groove contact portion It is to provide a solid electrolytic capacitor and a method of manufacturing the same to achieve a stable coupling.

The object of the present invention is a condenser element, a wire having one end protruded to one side of the condenser element, the anode terminal is in close contact with one side of the condenser element, the concave groove is formed on the coupling end, There is provided a solid electrolytic capacitor including an outer terminal of the negative electrode terminal tightly coupled to the other side of the condenser element and an outer molded part surrounding the outside of the condenser element to which the wire is coupled, and the lower end of the positive electrode terminal and the negative electrode terminal bent to the bottom surface thereof. Is achieved by

The condenser element includes a pellet having a predetermined shape, an insulating layer surrounding the outside of the pellet, and a cathode lead layer formed on a surface of the insulating layer.

In this case, a negative electrode reinforcement layer is further formed on the outer surface of the negative electrode withdrawal layer of the condenser element to improve conductivity of the polarity of the negative electrode of the negative electrode withdrawal layer.

In addition, the negative electrode reinforcement layer is constituted by only one of powders of conductive materials such as carbon or silver paste is applied individually or sequentially.

On the other hand, the pellet is produced into a cube-shaped molded body by mixing the decarburized powder and the binder in a predetermined ratio, followed by stirring to compress the mixed powder at a high temperature to a standardized dimension and density.

At this time, the pellet is sintered under compression and high vibration of the porous material.

The insulating layer surrounding the pellet is formed of a dielectric oxide film layer in which tantalum oxide (Ta ₂ O ₅ ) is grown, and is formed by a chemical conversion process over the entire outer peripheral surface of the pellet.

In addition, the cathode withdrawal layer formed on the insulating layer is made of a manganese dioxide layer by a sintering process, the manganese dioxide layer is formed by impregnating a nitrate-manganese solution in the state in which the insulating layer is formed, the anode and the cathode by the insulating layer It is formed of divided capacitor elements.

In the condenser element surrounded by the insulating layer and the cathode lead-out layer, wires are inserted such that one end thereof is exposed through one side thereof.

The positive and negative terminals are electrically coupled to each other on both sides of the condenser element, and the positive and negative terminals are electrically connected to a wire coupled to the condenser element, and the negative terminal is connected to the surface of the condenser element. It is electrically connected via the conductive paste applied.

The exposed end side of the wire is mutually fused by laser irradiation in a state seated in a concave groove formed on the condenser element coupling end side of the positive electrode terminal. At this time, when the positive electrode terminal is in close contact with one side of the condenser element, an insulating material is applied on the contact interface so that the positive electrode terminal is electrically connected only by the contact of a wire.

On the other hand, the outer molding portion surrounding the outer surface of the condenser element except for the lower portion of the positive terminal and the negative terminal is formed, thereby protecting the contact surface between the positive electrode terminal and the negative terminal, including the outside of the condenser element to which the wire is coupled.

In addition, another object of the present invention is to prepare a capacitor element, the step of fixing the wire to one side of the capacitor element, the step of applying an insulating material and a conductive material on both sides of the capacitor element, the capacitor Fixing the positive electrode terminal and the negative electrode terminal to both sides of the device through an insulating material and a conductive material, and fixing one end of the wire to a concave groove formed in the condenser element coupling end of the positive electrode terminal; Bonding and fixing the terminals by laser welding, molding the outside of the condenser element to form an exterior molding part, and bending the positive and negative terminals protruding from the exterior molding part to be in close contact with the bottom surface of the capacitor. It is achieved by providing a method of manufacturing a solid electrolytic capacitor comprising the step.

In this case, the preparing of the condenser element may include: forming an insulating layer by growing an oxide film by a sintered pellet of a rectangular parallelepiped and an outer surface of the pellet by a chemical conversion process using an electrochemical reaction; And dipping the formed condenser element into a nitric acid-manganese solution, and then forming a cathode withdrawing layer through a calcination process.

The method may further include forming a cathode reinforcement layer by sequentially applying carbon and silver paste on the outer surface of the cathode lead-out layer.

The insulating layer is composed of a dielectric oxide film layer in which tantalum oxide (Ta ₂ O ₅ ) is grown, and the cathode withdrawing layer of the exterior is composed of a manganese dioxide layer.

In addition, the negative electrode reinforcement layer is to enhance the polarity of the negative electrode withdrawing layer to improve the conductivity of the conductive powder applied to the outer surface and the negative electrode terminal contacted thereto.

Matters relating to the operational effects including the technical configuration for the above object of the solid electrolytic capacitor and its manufacturing method according to the present invention will be clearly understood by the following detailed description with reference to the drawings in which preferred embodiments of the present invention are shown.

Structure of capacitor

First, FIG. 7 is a perspective view of a solid electrolytic capacitor according to the present invention, FIG. 8 is a front sectional view of the solid electrolytic capacitor according to the present invention, and FIG. 9 is a side sectional view of the solid electrolytic capacitor according to the present invention.

As shown, the solid electrolytic capacitor 10 of the present invention is a capacitor device 20, the wire 30 is coupled to one side of the capacitor device 20, and the anode coupled to both sides of the capacitor device 20 Protects the coupling portion of the condenser element 20 and each of the terminals 41 and 42 while the terminal 41 and the negative terminal 42 and the positive terminal 41 and the negative terminal 42 are closely coupled. In order to include the outer molding portion 50 formed in the outermost layer.

In addition, one end of the wire 30 is coupled to be exposed to one side of the condenser element 20, and one end of the exposed wire 30 is electrically connected to the coupling end of the condenser element 20 of the positive electrode terminal 41. Is connected.

In this case, the positive terminal 41 is formed with a concave groove 41a into which the exposed end of the wire 30 is inserted, and the positive terminal 41 and the negative terminal 42 are formed on both side surfaces of the condenser element 20. Mounted on each other symmetrically.

In addition, the outer molding part 50 may be formed on the outer side of the coupling surface of the positive electrode terminal 41 and the negative electrode terminal 42 except for the condenser element 20, the wire 30 protruding to one side, and the lower exposed portion. Is formed to protect the condenser element 20 and the junction portion of each terminal 41 and 42 electrically connected thereto.

On the other hand, a lower surface of the exterior molding part 50 extends to the free end side of the positive electrode terminal 41 and the negative electrode terminal 42 coupled to both side surfaces of the condenser element 20, that is, the lower portion of the condenser element 20. The lower end is bent and tightly coupled.

Looking at the solid electrolytic capacitor 10 of the present invention having such a configuration in more detail,

The condenser element 20 is formed of a rectangular parallelepiped, and an insulating layer 22 and a cathode extracting layer 23 are formed on the outer circumferential surface of the pellet 21 having the polarity of the anode.

In addition, the pellet 20 is insulated from the cathode withdrawing layer 23 formed on the outside by the insulating layer 22 made of a dielectric oxide film layer, the insulating layer 22 is a chemical conversion process using an electrochemical reaction Is formed by growing an oxide film Ta ₂ O ₅ on the surface of the pellet 21.

In this case, the insulating layer 22 changes the pellet 21 into a dielectric.

Here, the pellet 21 is made of a mixture of decarburized powder and a binder, the mixture is stirred by mixing the decarburized powder and the binder at a predetermined ratio, and the mixed powder is compressed and molded into a rectangular parallelepiped, and then sintered under high temperature and high vibration. Is produced.

The pellet 21 may be manufactured by sintering using a material such as niobium (Nb) oxide in addition to tantalum (Ta).

On the other hand, the negative electrode withdrawal layer 23 is impregnated with a pellet 21 formed of an insulating layer 22 in the nitric acid-manganese solution so that the nitric acid-manganese solution is applied to its outer surface and then fired to have a negative electrode It is formed of a manganese dioxide (MnO ₂ ) layer.

In addition, the negative electrode reinforcement layer 24 is formed on the outer surface of the negative electrode withdrawal layer 23, in which carbon (carbon 24a) and silver paste (silver paste) 24b are sequentially applied. By improving the conductivity of the polarity of the negative electrode withdrawal layer 22, the electrical connection for the polarity transfer with the negative electrode terminal 42 directly connected to the negative electrode reinforcing layer 24 is facilitated.

On the other hand, an insulating material 61 and a conductive material 62 are coated on both side surfaces of the condenser element 20 manufactured as described above, and the insulating material 61 includes an insulator that is curable in a plate shape including the oxide film described above. The conductive material 62 is an electrically conductive conductor, and typically a silver paste is coated.

In this case, it is preferable that the insulating material 61 and the conductive material 62 include an adhesive component.

Both sides of the capacitor element 20 coated with the insulating material 61 and the conductive material 62 are symmetrical with each other so that the lower end thereof protrudes below the capacitor element 20, respectively. 42) are closely coupled side by side.

At this time, the positive electrode terminal 41 is insulated from the negative lead layer 22 formed on the outermost layer of the capacitor element 20 by the insulating material 61 coated on one side of the capacitor element 20. (30) By being combined with one end, it has the polarity of the positive electrode.

In addition, the negative electrode terminal 42 is directly electrically connected by the conductive material 62 applied to the negative electrode withdrawing layer 23 or the negative electrode reinforcing layer 24 of the outermost layer of the capacitor device 20 to have the polarity of the negative electrode.

The positive electrode terminal 41 is formed at a central portion of the coupling end of the condenser element 20, that is, at a point where the wire 30 protrudes from one side of the condenser element 20, and thus has a concave groove corresponding to the wire 30. 41a).

One end of the wire 30 protruding to one side of the condenser element 20 is seated in the concave groove 41a, and the wire 30 is embedded in the concave groove 41a to provide stable seating. After the mounting of the wire 30, the laser is irradiated to the upper portion of the concave groove 41a including the contact portion of the concave groove 41a and the wire 30, and thus the wire 30 and the positive terminal. 41 is fusion-bonded. Thus, the positive electrode terminal 41 is electrically connected to the condenser element 20 having the positive electrode.

Here, the height of the concave groove (41a) is preferably formed larger than the diameter of the wire 30, the upper portion of the concave groove (41a) is formed of an opening 41b smaller than the diameter of the wire (30).

The reason is that the side wall and the opening 41b of the concave groove 41a extending above the wire 30 are melted during laser welding of the wire 30 seated in the concave groove 41a, and the wire 30 is melted. By flowing down to the upper portion of the hardening, the coupling end of the positive electrode terminal 41 in which the concave groove 41a is formed is to ensure a firm coupling while wrapping the wire 30.

That is, since the wire 30 is firmly coupled to the anode terminal 41 while being recessed in the concave recess 41a, an effect of enhancing the reliability of the electrical connection may be exerted.

When the positive electrode terminal 41 and the negative electrode terminal 42 are coupled to the condenser element 20 and the positive electrode terminal 41 and the wire 30 are bonded together, the outer surface and the wire of the condenser element 20 are connected. 30 and an exterior molding part 50 surrounding the coupling portion of the positive terminal 41 and the negative terminal 42 are formed.

At this time, the exterior molding part 50 is formed by molding the epoxy.

In addition, the positive electrode terminal 41 and the negative electrode terminal 42 attached to both side surfaces of the condenser element 20 have their lower ends bent inward with respect to the center portion so as to be in close contact with the bottom surface of the exterior molding part 50. The outer molding part 50 is provided with electrode terminals having positive and negative electrodes on both sides thereof.

As described above, the solid electrolytic capacitor 10 of the present invention has a capacitor device having the same size as the wire 30 and the anode terminal 41 for extracting the anode of the capacitor device 20 are directly connected without a separate reinforcing material as in the prior art. The capacitance of 20 can be maximized and its size can be minimized when formed with the same capacitance.

In addition, an opening 41b of the concave groove 41a is recessed in the upper portion of the wire 30 by laser processing when the wire 30 and the positive electrode terminal 41 are coupled to each other so that one end of the positive electrode terminal 41 is recessed. Since the structure wraps around the outer circumferential surface of the wire 30, there is little probability that an electrical short occurs. Since the positive terminal 41 and the negative terminal 42 are in close contact with the bottom surface of the exterior molding part 50, the substrate (not shown in the drawings). When mounting, the mounting height can be minimized.

Manufacturing method of capacitor

A method of manufacturing a solid electrolytic capacitor having such a technical configuration will be described below with reference to FIGS. 10 to 15.

10 to 15 are cross-sectional views sequentially showing a method of manufacturing a solid electrolytic capacitor according to the present invention.

In the solid electrolytic capacitor according to the present invention, as shown in FIG. 10, a rectangular parallelepiped condenser element 20 is manufactured. First, the condenser element 20 mixes tantalum (Ta) powder and a binder at a predetermined ratio. The mixed powder is compressed through a press molding machine and sintered to form pellets 21 having characteristics of the positive electrode.

Next, tantalum oxide is grown on the outer surface of the pellet 21 by a chemical conversion process using an electrochemical reaction to form an insulating layer 22 made of an oxide film layer.

In this case, the insulating layer 22 to have the capacitor element 20 has the properties of the dielectric to have an optimal capacitance within a limited volume, the pellet 21 is a rectangular parallelepiped to the compression molded body at high temperature and It is formed by sintering under high vibration.

Subsequently, the pellet 21 surrounded by the insulating layer 22 is impregnated in the nitric acid-manganese solution to sinter the nitric acid-manganese solution applied on its outer surface, thereby forming a cathode withdrawing layer 23 made of a manganese dioxide layer. .

Next, carbon and silver paste are sequentially applied to the surface of the negative electrode withdrawal layer 23 to form the negative electrode reinforcement layer 24.

In this case, the reason for forming the negative electrode reinforcement layer 24 is to reinforce the polarity of the negative electrode withdrawal layer 23 to improve the conductivity of the conductive powder applied to the outer surface and the negative electrode terminal contacted thereto, It may or may not be formed in consideration of the size of the capacitor element 20 and the solid electrolytic capacitor.

Next, in the state in which the insulating layer 22, the cathode withdrawing layer 23 and the cathode reinforcing layer 24 are sequentially formed on the surface of the pellet 21, as shown in FIG. One end of the wire 30 is inserted and fixed to protrude on one side.

12 and 13, an adhesive made of an insulating material 61 and a conductive material 62 is coated on both sides of the capacitor element 20 to which the wire 30 is coupled, and then the insulating material ( The positive electrode terminal 41 and the negative electrode terminal 42 are bonded to both sides of the condenser element 20 through the 61 and the conductive material 62, respectively.

At this time, the lower ends of the positive electrode terminal 41 and the negative electrode terminal 42 are extended to both lower sides of the capacitor element 20.

In addition, the protruding end of the wire 30 is inserted and fixed into the concave groove 41a formed at the joining surface end side thereof.

Next, in a state where one end of the wire 30 is inserted and seated in the concave groove 41a, the contact portion of the wire 30 and the concave groove 41a is irradiated with a laser to detect the positive electrode terminal 41 and the wire ( 30) to be fusion bonded.

At this time, the side wall extending to the upper end of the concave groove (41a) is melted by the irradiation heat of the laser to flow down, so that the wire 30 is fixed by being recessed in the upper end of the positive electrode terminal (41).

Here, the laser irradiated to the contact portion of the concave groove (41a) of the wire 30 is irradiated with a laser having a low frequency and irradiation heat to the extent that the upper end of the concave groove (41a) is irradiated with the positive terminal ( By irradiating the laser irradiation heat to the condenser element 20 in close contact with 41), thermal damage of the condenser element 20 is prevented.

Subsequently, as shown in FIG. 14, a molding process using epoxy is used on the outer surface of the condenser element 20 except for the lower ends of the positive electrode terminal 41 and the negative electrode terminal 42 extending below the condenser element 20. The exterior of the exterior molding part 50 is formed.

Lastly, as shown in FIG. 15, the lower ends of the positive electrode terminal 41 and the negative electrode terminal 42 extending to both lower sides of the capacitor 10 on which the exterior molding part 50 is formed are bent inward to form the positive terminal ( 41) and the lower ends of the cathode terminal 42 are tightly coupled to the lower surface of the exterior molding part 50 to form external electrodes, thereby completing the manufacture of the solid electrolytic capacitor 10.

Preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and various substitutions, modifications, and changes within the scope without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It will be possible, but such substitutions, changes and the like should be regarded as belonging to the following claims.

As described above, in the solid electrolytic capacitor of the present invention, the positive electrode terminal and the negative electrode terminal are symmetrically coupled to both sides of the condenser element, and the freeness of the wire coupled to the condenser element in the concave groove formed at one end of the positive electrode terminal. Since the end side is seated, there is no need for a separate reinforcing material for connecting the wire and the positive terminal, thereby maximizing the area occupied by the condenser element, thereby improving the capacitance.

In addition, the solid electrolytic capacitor of the present invention is to ensure that one end of the wire is recessed by the laser processing in the concave groove formed at one end of the positive electrode terminal to be stably coupled with the positive electrode terminal, thereby preventing electrical short circuit to improve reliability, As it is manufactured in a simple process, there is an effect that can reduce the production cost.

In addition, according to the present invention, since the external molding part formed by the epoxy molding is formed outside the joint surface of the positive electrode terminal and the negative electrode terminal which are coupled to both sides of the condenser element, the reliability of the terminal connection between the positive electrode and the negative electrode is improved by extending the molding contact portion. Can be improved.

In addition, the present invention is resistant to impact and prevents moisture from penetrating into the capacitor because the exterior molding part of the epoxy molding is integrated while covering the entire exterior of the capacitor element, and the positive and negative terminals are lifted from both sides of the capacitor element. There is an advantage that can be avoided.

Claims (22)

delete delete delete delete delete A condenser element having a polarity of an anode; A wire coupled to one end of the condenser element to protrude; An outer molding part surrounding an outer surface of the condenser element to which the wire is coupled and an electrode terminal to form an appearance; A concave groove is formed in close contact with one side of the condenser element, and a concave groove is formed at an upper end of the condenser surface, and the free end of the wire exposed to the condenser element side is electrically coupled to the concave groove, and a lower portion thereof is centered on a central portion. A positive electrode terminal bent into close contact with the bottom surface of the exterior molding part; And A negative electrode terminal which is tightly coupled to the other side of the condenser element, the lower portion of which is bent toward the inner side of the condenser element to be in close contact with the bottom surface of the exterior molding part; Including, The positive electrode terminal is tightly coupled to one side of the condenser element in a state of interposing a curable insulating material coated on one side of the condenser element, and the negative terminal is electrically applied to the other side of the condenser element. In close contact with the other side of the capacitor element in the state of the conductive material through the conductive, The capacitor device is a solid electrolytic capacitor, characterized in that consisting of a rectangular parallelepiped pellet, an insulating layer surrounding the outside of the pellet and a cathode lead layer formed on the surface of the insulating layer. The method of claim 6, And a negative electrode reinforcement layer is formed on an outer surface of the negative electrode withdrawal layer of the condenser element to improve conductivity of the polarity of the negative electrode of the negative electrode withdrawal layer. The method of claim 7, wherein The negative electrode reinforcement layer is a solid electrolytic capacitor, characterized in that the powder of a conductive material such as carbon (silver) or silver paste (silver paste) is applied individually or sequentially. delete The method of claim 6, The pellet is a solid electrolytic capacitor, characterized in that the tantalum (Ta) in addition to the sintering production using niobium (Nb) oxide. The method of claim 6, And the insulating layer is formed of a dielectric oxide film layer in which tantalum oxide (Ta ₂ O ₅ ) is grown by a chemical conversion process using an electrochemical reaction over the entire outer circumferential surface of the pellet. The method of claim 6, The cathode extracting layer is a solid electrolytic capacitor, characterized in that formed in the manganese dioxide layer by a calcination process by impregnating the nitric acid-manganese solution in the state in which the insulating layer is formed. The method of claim 6, And said wire is fusion-bonded by laser irradiation in a state where the end side thereof is seated in the concave groove of the anode terminal. The method of claim 13, The concave groove is formed, the height of which is larger than the diameter of the wire, the upper portion is a solid electrolytic capacitor, characterized in that the opening is formed having a width smaller than the diameter of the wire. delete Preparing a capacitor element; Inserting and fixing a wire to one side of the condenser element; Coating an insulating material and a conductive material on both sides of the capacitor device; Fixing the positive electrode terminal and the negative electrode terminal to both sides of the capacitor element through an insulating material and a conductive material applied to both sides of the capacitor element; The projecting end side of the wire is fixed to a concave groove formed on an upper end of a bonding surface of the positive terminal; Jointly fixing the wire and the positive terminal by laser welding; Molding an exterior of the condenser element to form an exterior molding part; And Bending the positive electrode terminal and the negative electrode terminal protruding below the outer molding part into the inner side so as to be in close contact with a lower surface of the outer molding part; Including, and preparing the capacitor device, Forming an insulating layer by growing an oxide film by a sintered pellet of a rectangular parallelepiped and an outer surface of the pellet by a chemical conversion process using an electrochemical reaction; Dipping the capacitor device on which the insulation layer is formed into a nitric acid-manganese solution, and then forming a cathode withdrawing layer through a firing process; Method of producing a solid electrolytic capacitor further comprising. The method of claim 16, After the forming of the cathode lead layer, A method of manufacturing a solid electrolytic capacitor further comprising the step of sequentially applying a carbon and silver paste on the outer surface to form a negative electrode reinforcement layer. The method of claim 16, The insulating material is a manufacturing method of a solid electrolytic capacitor, characterized in that consisting of an insulating film (insulation) including the oxide film curable. The method of claim 16, The conductive material is an electrically conductive conductor, a method of manufacturing a solid electrolytic capacitor, characterized in that the silver paste (silver paste). The method of claim 16, The insulating material and the conductive material is a manufacturing method of a solid electrolytic capacitor, characterized in that it comprises an adhesive component. The method of claim 16, The pellet is a method of manufacturing a solid electrolytic capacitor, characterized in that the decarburized powder and the binder is mixed in a predetermined ratio and then stirred to compress the mixed powder at a high temperature to a standardized dimension and density at a high temperature. The method of claim 21, The pellet is manufactured by sintering using niobium (Nb) oxide in addition to tantalum (Ta).

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