CN104979099B - Solid electrolytic capacitor and method for manufacturing the same - Google Patents

Abstract

A solid electrolytic capacitor and its preparation method, the solid electrolytic capacitor includes a flat capacitor winding body, two inner pins, an insulating packaging body and two outer pins, the two inner pins are inserted and set up on the flat capacitor winding body, the insulating packaging body coats the flat capacitor winding body and the two inner pins, the two outer pins connect the two inner pins separately, and the section exposed to the insulating packaging body is located on the surface of the insulating packaging body; the invention has simple structure and easy implementation, and can carry out mass and quick packaging through automatic mechanical equipment, thereby improving the productivity and improving the quality of finished products.

Description

Solid electrolytic capacitor and its manufacturing method

technical field

The invention relates to a capacitor and its manufacturing method, in particular to a solid electrolytic capacitor and its manufacturing method.

Background technique

Capacitors have a wide range of uses. For example, capacitors can be used to store electric energy, improve power factor, filter noise, filter, signal coupling and resonance, etc. Therefore, capacitors are quite basic and important electronic components in electronic circuit devices.

Please refer to the electrolytic capacitor of Taiwan Patent Announcement No. M250303, which mainly includes a body and a shell. The body is arranged in the shell. The body includes dielectric materials and wire terminals. connected composition. The wire terminal passes through the casing for connection with an external circuit board or other electronic devices. However, the structure of the electrolytic capacitor in the aforementioned patent is complicated. For example, the casing is assembled by a cover plate and a casing, and even in other structures, it also includes structures such as sockets, posts, and rivets. When assembling, it is necessary to put the body into the casing one by one, and then fix the cover plate on the casing. Such a mechanical assembly method is prone to incomplete assembly or poor adhesion, which makes it difficult to improve the production capacity and product quality of electrolytic capacitors.

In addition, the two wire terminals of the main body are inserted into the dielectric, please refer to Figure 1B of the aforementioned M250303 patent, however, the dielectric is a cylindrical winding body, and the winding structure is quite dense. As a result, the volume of the dielectric cannot be reduced. When the electrolytic capacitor of the aforementioned M250303 patent is applied to an electronic device, it will occupy a large space, which does not meet the current demand for size reduction of electronic devices.

Contents of the invention

Therefore, the main purpose of the present invention is to provide a solid electrolytic capacitor and its manufacturing method. The electrolytic capacitor of the present invention has a simple structure and a small volume, and overcomes the shortcomings of the existing electrolytic capacitors with complicated structures.

The solid electrolytic capacitor of the present invention comprises:

A flat capacitor wound body;

a first inner pin inserted on the flat capacitor wound body;

A second inner pin, inserted on the flat capacitor wound body and opposite to the first inner pin, wherein the first and second inner pins are on one end surface of the flat capacitor wound body extend outward;

an insulating package covering the flat capacitor winding body, the first inner lead and the second inner lead;

A first outer lead has a first section and a second section, the first section is set in the insulating package and connected to the first inner lead, the second section is exposed to the insulating package a package disposed on a surface of the insulating package; and

A second outer pin has a first section and a second section, the first section is set in the insulating package and connected to the second inner pin, the second section is exposed to the insulating package The package body is arranged on the surface of the insulating package body.

The preparation method of solid electrolytic capacitor of the present invention comprises the following steps:

Prepare a base material, which includes a cylindrical capacitor winding body and two inner pins inserted on the cylindrical capacitor winding body, wherein the two inner pins are on the flat capacitor winding body One end surface extends outward, and the innermost circle of the cylindrical capacitor winding body is a rectangular winding with four turning parts, which are respectively the first, second, third and fourth turning parts. The first and third The turning parts are arranged oppositely, the second and fourth turning parts are arranged oppositely, and the two inner pins are respectively located on the opposite side of the innermost circle of the cylindrical capacitor winding body and adjacent to the first and third turning parts respectively;

flattening the tubular capacitor wound body from the second and fourth turning parts to form a flat capacitor wound body;

connecting an external pin to the two internal pins respectively;

forming an insulating package to cover the flat capacitor winding body and the two inner leads, and exposing the two outer leads to the insulating package;

The two outer leads are bent so that each outer lead is arranged on the surface of the insulating package.

Another manufacturing method of the solid electrolytic capacitor of the present invention comprises the following steps:

Prepare a base material, which includes a cylindrical capacitor winding body and two inner pins inserted on the cylindrical capacitor winding body, wherein the two inner pins are on the flat capacitor winding body One end surface extends outward, and the innermost circle of the cylindrical capacitor winding body is a rectangular winding with four turning parts, which are respectively the first, second, third and fourth turning parts. The first and third The turning parts are arranged oppositely, the second and fourth turning parts are arranged oppositely, and the two inner pins are respectively located on the opposite side of the innermost circle of the cylindrical capacitor winding body and adjacent to the first and third turning parts respectively;

flattening the tubular capacitor wound body from the second and fourth turning parts to form a flat capacitor wound body;

connecting an external pin to the two internal pins respectively;

bending the two outer leads so that a section of the two outer leads is parallel to the flat capacitor winding body and maintains a distance;

Carrying out the packaging step to form an insulating package body, so that the flat capacitor winding body is located in the insulating package body, and the two outer leads are adhered to the surface of the insulating package body, and the surfaces of the two outer leads are in contact with the surface of the insulating package body. The surfaces are coplanar.

To sum up, the structure of the present invention is simple, and the present invention forms an insulating package to cover the flat capacitor wound body. Compared with the prior art, the insulating package of the present invention has more advantages than the existing assembly structure. With good airtightness, moisture cannot enter the insulating package, which ensures the quality of the finished product of the present invention. Furthermore, the present invention uses a flattening step to form a flat capacitor wound body. Compared with the prior art, the flat capacitor wound body has a smaller volume, effectively reducing the volume of the finished electrolytic capacitor, and because the The flat capacitor wound body has a flat shape, and its appearance can be closer to a printed circuit board or an electronic device, which meets the requirement of miniaturization of electronic components.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1: the schematic flow sheet of method of the present invention;

Fig. 2: the schematic plan view (1) of substrate in the preparation method of the present invention;

Fig. 3: the schematic plan view (two) of substrate in the preparation method of the present invention;

Fig. 4: the end face schematic diagram of base material in the preparation method of the present invention;

Fig. 5: the schematic view of the end face of the flat capacitor wound body in the present invention;

Fig. 6: Plane schematic diagram of flat capacitor winding body and inner pin in the present invention;

Fig. 7: the schematic plan view of truncated inner pin in the preparation method of the present invention;

Fig. 8: the schematic plan view (1) that inner pin is connected with outer pin in the method for making of the present invention;

Fig. 9: the plane schematic diagram (two) that inner pin is connected with outer pin in the method for making of the present invention;

Figure 10: A schematic plan view of the insulating package and the truncated pin seat in the method of the present invention;

Fig. 11: Another embodiment of the present invention's method of manufacture is the schematic plan view (1) that inner pin is connected with outer pin;

Fig. 12: another embodiment of the present invention's method of manufacture is the schematic plan view (two) that inner pin is connected with outer pin;

Figure 13: A schematic plan view of another embodiment of the method of the present invention after forming an insulating package and truncating the pin seat;

Figure 14: A schematic diagram of the three-dimensional appearance of the solid electrolytic capacitor of the present invention (1);

Figure 15: a schematic diagram of the three-dimensional appearance of the solid electrolytic capacitor of the present invention (2);

Figure 16: A schematic diagram of the three-dimensional appearance of another embodiment of the solid electrolytic capacitor of the present invention;

Fig. 17: A schematic perspective view of another embodiment of the solid electrolytic capacitor of the present invention.

Among them, reference signs

10 Substrate 101 First turning point

102 Second Turning Section 103 Third Turning Section

104 Fourth turning part 11 Cylindrical capacitor wound body

110 Flat Capacitor Winding Body 12 Inner Pins

120 connector 13 external pins

130-pin header 14 insulated package

15 First outer pin 151 First section

152 The second section 16 The second external pin

161 First section 162 Second section

20 Flat Capacitor Winding Body 21 First Inner Pin

22 Second inner pin 23 Insulating package

24 First outer pin 241 First segment

242 Second segment 243 Third segment

25 Second outer pin 251 First section

252 Second Section 253 Third Section

31 First block 32 Second block

33 gap

Detailed ways

Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

The manufacturing method of the present invention can be operated in automated machinery and equipment. Please refer to the production flow chart of the solid electrolytic capacitor of the present invention shown in FIG. 1, and refer to FIG. 2 to FIG. The substrate 10 includes a cylindrical capacitor winding body 11 and two inner pins 12 inserted on the cylindrical capacitor winding body 11, and the two inner pins 12 are formed from the cylindrical capacitor winding body 11. The same end surface of the same end extends outwards. The cylindrical capacitor winding body 11 is mainly composed of an anode foil, a cathode foil, and an isolation layer, which are alternately insulated and wound. The two inner pins 12 are respectively electrically connected to the anode foil. With the cathode foil, the inner pin 12 may be an aluminum pin. As shown in Figure 4, the tubular capacitor winding body 11 can be wound on a needle, wherein the needle is rod-shaped, and one end of the needle forms a slightly triangular first block 31 and a The second block 32, as shown in Figure 4, the bottom of the first block 31 and the second block 32 are oppositely arranged, and a gap 33 is maintained between the two blocks 31, 32, the cylindrical capacitor One end of the jellyroll 11 is arranged in the gap 33 and is wound outward, so that the innermost circle of the cylindrical capacitor jellyroll 11 forms a rectangular winding along the peripheral shapes of the two blocks 31, 32. There are four turning parts, respectively the first turning part 101, the second turning part 102, the third turning part 103 and the fourth turning part 104, the first and the third turning parts 101, 103 are set oppositely, the second turning part It is opposite to the fourth turning part 102, 104, and the two inner pins 12 are respectively located on opposite sides of the innermost rectangle of the tubular capacitor winding body 11 and adjacent to the first and third turning parts 101, 103 respectively. , or in another embodiment, the two inner pins 12 may be respectively located on adjacent sides of the rectangle.

Please refer to FIG. 5 and FIG. 6, and then the second and fourth turning parts 102, 104 of the innermost circle of the cylindrical capacitor winding body 11 (that is, the innermost circle of the cylindrical capacitor winding body 11) Rectangular diagonal orientation) flattens the cylindrical capacitor winding body 11, deforms the cylindrical capacitor winding body 11 and becomes a flat capacitor winding body 110, wherein the two inner pins 12 are formed from the flat capacitor winding body The same end surface of the winding body 110 is extended outward (step 102 ). These turning portions 101-104 can be used as position marks, because the two inner pins 12 are respectively arranged adjacent to the first and third turning portions 101, 103, after the cylindrical capacitor winding body 11 is flattened, the The two inner pins 12 are naturally positioned on opposite sides of the flat capacitor winding body 110 . In addition, the positions of the two inner pins 12 are arranged diagonally opposite each other, so that the user can distinguish the polarity of the inner pins 12 .

After forming the flat capacitor winding body 110, as shown in FIG. 7, the two inner pins 12 are first cut off by a cutter or a cutting device to expose the end section of the flat capacitor winding body 110, so that each One end of the inner pin 12 is disposed in the flat capacitor winding body 110 , and the other end of each inner pin 12 is exposed to the flat capacitor winding body 110 to form a connecting portion 120 (step 103 ). In this cutting step, since the two inner pins 12 extend outward from the same end surface of the flat capacitor winding body 110, the two inner pins 12 can be cut off at the same time by a cutter or a cutting device and exposed on the flat capacitor winding body 110. The last section of the capacitor winding body 110, moreover, because the two inner pins 12 are located on the opposite sides of the flat capacitor winding body 110 and have a rather long distance, the two inner pins 12 are not easy to contact each other, so it is not necessary to There will be a problem of short circuit.

After truncating the ends of the inner pins 12, as shown in Figure 8 and Figure 9, an outer pin 13 is respectively connected to the connecting portion 120 of the two inner pins 12, and the outer pin 13 is a direct lead. feet (step 104). The outer pins 13 can be arranged on the pin base 130 , so as to facilitate automatic mechanical equipment to connect the inner pins 12 on the plurality of flat capacitor wound bodies 110 to the outer pins 13 of the pin base 130 respectively. In this preferred embodiment, the inner pins 12 and the outer pins 13 are connected by soldering, and the outer pins 13 can be tin pins.

After connecting the external pins 13, as shown in FIG. 10, the flat capacitor coils 110 are filled and packaged by automated mechanical equipment to form an insulating package 14 to cover the flat capacitor coils. body 110 and two inner leads 12, and make the two outer leads 13 exposed to the insulating package. After the package body 14 is formed, the lead base 130 shown in FIG. 9 is cut off to separate the flat capacitor wound bodies 110 to form an independent unit (step 105 ).

Please refer to FIG. 11 to FIG. 13 , in another preferred embodiment, the outer pin can be a curved structure. The connecting portions 120 of the two inner pins 12 on the flat capacitor winding body 110 are respectively connected to a first outer pin 15 and a second outer pin 16, and the first outer pin 15 has a first Section 151 and a second section 152, one end of the second section 152 is connected to the pin base 130, and the first section 151 is connected to the other end of the second section 152; the second outer pin 16 has A first section 161 and a second section 162 , one end of the second section 162 is connected to the pin socket 130 , and the first section 161 is connected to the other end of the second section 162 . The distance between the first section 151 of the first outer lead 15 and the first section 161 of the second outer lead 16 is smaller than the distance between the second section 152 of the first outer lead 15 and the second outer lead 16. The spacing between the second sections 162 of the feet 16 . Please refer to FIG. 13 , after these flat capacitor winding bodies 110 are filled and packaged, the width of the insulating package body 14 is equal to the width of the second section 152 of the first outer lead 15 and the second outer lead. 16 the length between the second sections 162 .

Please refer to the first preferred embodiment shown in Figure 14 (please refer to Figure 16 for another preferred embodiment), after cutting off the pin seat, then bend the two outer pins 13 so that each outer pin 13 is set On the surface of the insulating package 14 , a solid electrolytic capacitor is completed (step 106 ), wherein the first and second outer leads 15 , 16 protrude from the surface of the insulating package 14 .

After the 104th step, the present invention provides another manufacturing method, taking Fig. 12 as an example, that is, after connecting the pins on the pin base 130, the pin base 130 is not cut off, but the first and second The outer leads 15 and 16 make the second segment 152 of the first outer lead 15 and the second segment 162 of the second outer lead 16 parallel to the flat capacitor winding body 110 and maintain a distance therebetween. After bending the two outer pins 15 and 16, the flat capacitor wound body 110 is put into the mold cavity of the mold to carry out the packaging step. When the mold cavity is filled with sealing glue, the sealing glue is to cover the flat capacitor The winding body 110 is used for adhering the first and second outer pins 15 and 16 due to the certain viscosity of the sealing glue. Please refer to FIG. 17, after the sealant is cured to form the insulating package body 14, the flat capacitor winding body 110 is located in the insulating package body 14, and the first and second outer leads 15, 16 are adhered to the insulating package body. The surface of the body 14 , wherein the surfaces of the first and second outer pins 15 , 16 and the second section 152 , 162 are coplanar with the surface of the insulating package 14 . After the package body 14 is formed, the lead base 130 is cut off by the automatic mechanical equipment to separate the insulating package bodies 14 to form an independent entity and complete the solid electrolytic capacitor.

As can be seen from the foregoing, the present invention can be manufactured by automated mechanical equipment. For example, as shown in FIGS. In order to carry out the steps of potting and packaging in large quantities and quickly, the present invention has considerable advantages in technology.

Therefore, to summarize the above, please refer to FIG. 15, the solid electrolytic capacitor of the present invention includes a flat capacitor winding body 20, a first inner lead 21, a second inner lead 22, and an insulating package 23. . A first external pin 24 and a second external pin 25 .

The flat capacitor wound body 20 is mainly formed by winding an anode foil, a cathode foil, and a plurality of isolation layers alternately insulated and arranged. The first inner pin 21 has an opposite first end and a second end, the first end is arranged in the flat capacitor wound body 20 and connected to the anode foil, and the second end is exposed to the flat capacitor winding body 20 . Similarly, the second inner pin 22 has an opposite first end and a second end, the first end is arranged in the flat capacitor winding body 20 and connected to the cathode foil, and the second end is exposed on the The flat capacitor wound body 20 . Wherein, the second ends of the first and second inner pins 21 , 22 extend outward from the same end surface of the flat capacitor winding body 110 , and the first and second inner pins 21 , 22 are oppositely disposed.

The insulating package 23 covers the flat capacitor winding body 20 , the first inner lead 21 and the second inner lead 22 . The first outer pin 24 has a first segment 241 and a second segment 242 connected in sequence, the second segment 242 can be further extended to form a third segment 243, the first segment 241 is set In the insulating package 23 and connected to the first inner pin 21, the second section 242 is exposed to the insulating package 23 and flatly attached to the surface of the insulating package 12, the third section 243 It is flatly attached to the surface of the insulating package 12 opposite to the first section 241 . Similarly, the second outer pin 25 has a first segment 251 and a second segment 252 connected in sequence, and the second segment 252 can be further extended to form a third segment 253, the first segment The section 251 is arranged in the insulating package 23 and connected to the second inner pin 22, the second section 252 is exposed to the insulating package 23, and is in the same position as the second section of the first outer pin 24. On the same side and flat against the surface of the insulating package 23 , the third segment 253 is flat against the surface of the insulating package 12 opposite to the first segment 251 . It can be seen from Fig. 15 that the second sections 242, 252 of the first and second outer leads 24, 25 are flatly attached to the same side of the insulating package 23, and the inner leads 21, 22 are connected with the outer leads. The pins 24 and 25 are flat pins respectively.

Please refer to Figure 16, which is the result of bending the first and second outer pins 15, 16 in the embodiment shown in Figure 13, the width of the insulating package 14 is equal to the first outer pin 15 and the second The length between the section 152 and the second section 162 of the second external pin 16, the two external pins 15, 16 are respectively located on opposite sides of the insulating package 14 to serve as contacts for connecting external electronic devices, This structure is similar to a multilayer capacitor, so another embodiment of the present invention can be used to replace the existing multilayer capacitor.

In this preferred embodiment, the first external pin 24 and the second external pin 25 are respectively tin pins. Since the present invention is flatly attached to the surface of the insulating package 23 by the outer pins 24, 25, the user can directly solder the present invention on the printed circuit board, because the outer pins 24, 25 are tin pins respectively, and are compatible with soldering. The materials (such as solder paste) are the same, so the present invention can be firmly fixed on the circuit board by means of soldering and is not easy to loosen and fall off.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1. a kind of solid electrolytic capacitor, which is characterized in that include：

One flat-shaped capacitance coiling body；

Pin in one first is inserted on the flat-shaped capacitance coiling body；

Pin in one second, be inserted on the flat-shaped capacitance coiling body and with this in first pin be oppositely arranged, wherein this first With second in pin extend outward in the end face of the flat-shaped capacitance coiling body；

One insulation-encapsulated body coats the flat-shaped capacitance coiling body, pin and the pin in second in first；

One first outer pin, has one first section, one second section and a third section, and first, the of first outer pin Two sequentially connect with third section, first section be set in the insulation-encapsulated body and connect this in first pin and close to this absolutely The left-hand face of edge packaging body, second section expose to the insulation-encapsulated body, and set on the surface of the insulation-encapsulated body, this Three sections are set to the right lateral surface of the insulation-encapsulated body；And

One second outer pin, has one first section, one second section and a third section, and first, the of first outer pin Two sequentially connect with third section, first section be set in the insulation-encapsulated body and connect this in second pin and close to this absolutely The left-hand face of edge packaging body, second section expose to the insulation-encapsulated body, and set on the surface of the insulation-encapsulated body, this Three sections are set to the right lateral surface of the insulation-encapsulated body,

Wherein, the second section of first outer pin and the second section of the second outer pin are positioned at the same of the insulation-encapsulated body Side；

Spacing between first outer pin, first section and first section of the second outer pin is less than first outer pin second Spacing between section and second section of the second outer pin.

2. solid electrolytic capacitor according to claim 1, which is characterized in that the flat-shaped capacitance coiling body is by an anode Foil, a Cathode Foil and multiple separation layers are alternately wound after insulation arranges；

This in first pin there is an opposite first end and a second end, the first end be set in the flat-shaped capacitance coiling body and The anode foils are connected, which exposes to the flat-shaped capacitance coiling body and connect the first section of first outer pin；

This in second pin there is an opposite first end and a second end, the first end be set in the flat-shaped capacitance coiling body and The Cathode Foil is connected, which exposes to the flat-shaped capacitance coiling body and connect the first section of second outer pin.

3. solid electrolytic capacitor according to claim 1, which is characterized in that first outer pin and the second outer pin are convex For the surface of the insulation-encapsulated body.

4. solid electrolytic capacitor according to claim 1, which is characterized in that the surface of first, second outer pin with The surface of the insulation-encapsulated body is coplanar.

5. solid electrolytic capacitor according to claim 1, which is characterized in that the pin point in pin and second in first Not Wei aluminium pin, first outer pin and the second outer pin are respectively tin pin.

6. a kind of preparation method of solid electrolytic capacitor, which is characterized in that include following steps：

Prepare a base material, the base material include a tubular capacitance coiling body be plugged in two it is interior on the tubular capacitance coiling body Pin, wherein this in two pin extend outward in the end face of the flat-shaped capacitance coiling body, the tubular capacitance coiling body it is most interior It encloses and has there are four turning point for the winding of rectangle, respectively first, second, third and the 4th turning point, this first and third Turning point is to be oppositely arranged, this second with the 4th turning point is to be oppositely arranged, this in two pin be located at the tubular capacitance and roll up Around the innermost circle opposite side of body and it is respectively adjacent to first and third turning point；

From second and the 4th turning point flatten the tubular capacitance coiling body and form a flat-shaped capacitance coiling body；

One first outer pin and one second outer pin are separately connected on two interior pins；

An insulation-encapsulated body is formed to coat the flat-shaped capacitance coiling body and two interior pins, and two outer pin is made to expose to this Insulation-encapsulated body；

Two outer pin is bent so that each outer pin is set to the surface of the insulation-encapsulated body, wherein each outer pin has one first Section, one second section and a third section, first, second sequentially connect with third section, first section of each outer pin In the insulation-encapsulated body and a corresponding interior pin and the left-hand face close to the insulation-encapsulated body are connected, each outer pin Second section exposes to the insulation-encapsulated body and the same side set on the insulation-encapsulated body, the third section of each outer pin Set on the right lateral surface of the insulation-encapsulated body；

Spacing between first outer pin, first section and first section of the second outer pin is less than first outer pin second Spacing between section and second section of the second outer pin.

7. the preparation method of solid electrolytic capacitor according to claim 6, which is characterized in that in the step of connecting outer pin Before, be first block this in two pin exposed so that one end of each interior pin is set to this flat in the latter end of the flat-shaped capacitance coiling body In shape capacitance coiling body, each interior pin another end exposes to the flat-shaped capacitance coiling body and forms a convergence part；In connection outer pin The step of in, be that each outer pin is connected to each convergence part.

8. the preparation method of the solid electrolytic capacitor described according to claim 6 or 7, which is characterized in that bending two outer pin The step of in, be the surface for enabling each outer pin be flattened on the insulation-encapsulated body.

9. a kind of preparation method of solid electrolytic capacitor, which is characterized in that include following steps：

Prepare a base material, the base material include a tubular capacitance coiling body be plugged in two it is interior on the tubular capacitance coiling body Pin, the wherein innermost circle of the tubular capacitance coiling body have for the winding of rectangle there are four turning point, and respectively first, the Two, third and the 4th turning point, this first with third turning point is to be oppositely arranged, this second with the 4th turning point for respect to setting Set, this in two pin be located at the innermost circle opposite side of the tubular capacitance coiling body and be respectively adjacent to first and transfer with third Portion；

From second and the 4th turning point flatten the tubular capacitance coiling body and form a flat-shaped capacitance coiling body；

One first outer pin and one second outer pin are separately connected on two interior pins；

Two outer pin is bent, keep a section of two outer pin parallel with the flat-shaped capacitance coiling body and maintains an interval；

Step is packaged to form an insulation-encapsulated body, the flat-shaped capacitance is made to wind position in insulation-encapsulated body, and this two Outer pin is sticked together on the surface of insulation-encapsulated body, the surface of the surface of two outer pin and the insulation-encapsulated body be it is coplanar, In, each outer pin has one first section, one second section and a third section, and first, second sequentially connect with third section, First section of each outer pin is set in the insulation-encapsulated body and connects a corresponding interior pin and close to the insulation-encapsulated body Left-hand face, second section of each outer pin exposes to the insulation-encapsulated body and the same side set on the insulation-encapsulated body Face, the third section of each outer pin are set to the right lateral surface of the insulation-encapsulated body；

Spacing between first outer pin, first section and first section of the second outer pin is less than first outer pin second Spacing between section and second section of the second outer pin.

10. the preparation method of solid electrolytic capacitor according to claim 9, which is characterized in that in the step of connecting outer pin Before, be first block this in two pin exposed so that one end of each interior pin is set to this flat in the latter end of the flat-shaped capacitance coiling body In shape capacitance coiling body, each interior pin another end exposes to the flat-shaped capacitance coiling body and forms a convergence part；In connection outer pin The step of in, be that each outer pin is connected to each convergence part.