TWI556278B - Solid electrolytic capacitor and its preparation method - Google Patents

Description

Solid electrolytic capacitor and its preparation method

This creation is about a capacitor, especially a solid electrolytic capacitor and its method of manufacture.

Capacitors are common electronic components of electronic circuit devices and are commonly used for storing electrical energy, improving power factor, filtering noise, filtering, signal coupling, and resonance. An electrolytic capacitor is disclosed in the Republic of China Patent Publication No. M250303, which mainly comprises an outer casing and a body disposed in the outer casing. The main body is provided with a dielectric material and a wire terminal, and the outer casing is mainly assembled by the cover plate and the casing. Made. The lead terminals are threaded out of the housing for connection to an external circuit board or other electronic device.

However, the outer casing is formed by assembling a cover plate and a casing. In other structures, complicated parts such as a socket, a post, a rivet, and the like are included, and thus the structure of the aforementioned patent is complicated; in addition, during assembly The cover plate is fixed to the casing after the body is placed into the casing as a single piece and one by one. Such a mechanical assembly method is prone to problems of incomplete assembly or poor adhesion, which causes external moisture to easily enter the inside of the casing and accelerate the deterioration of the electrolytic capacitor, so that the quality is not easily improved.

In view of the disadvantages of conventional capacitor assembly and poor sealing performance, the present invention provides a solid electrolytic capacitor and a method of manufacturing the same that overcome the disadvantages of the prior art.

The manufacturing method of the solid electrolytic capacitor of the present invention comprises the steps of: preparing a substrate comprising a cylindrical capacitor winding body and two inner lead pieces inserted in the cylindrical capacitor winding body The cylindrical capacitor winding body has a first end surface and a second end surface, and the two inner lead pieces are exposed to the first end surface of the cylindrical capacitor winding body to form an engaging portion; Attaching an outer lead piece to the connecting portions of the two inner lead pieces; respectively bending the outer outer lead pieces outwardly to make an angle between the bent outer lead piece and the inner lead piece The cylindrical capacitor winding body is placed in a cavity of the mold to perform a filling and packaging step to form a rectangular insulating package, and the insulating package covers the cylindrical capacitor winding body and Two inner lead pieces are exposed, and the two outer lead pieces are exposed to the insulating package, wherein the two outer lead pieces are coplanar with the surface of the insulating package.

The solid electrolytic capacitors provided by the present invention are manufactured by the aforementioned method.

In summary, the solid electrolytic capacitor of the present invention has a simple structure, and has no complicated assembly parts as described in the prior art, and the creative process is relatively easy to implement. The present invention utilizes an insulating package to cover the cylindrical capacitor winding. The insulating package effectively prevents the external moisture from affecting the cylindrical capacitor winding body, so that the conventional assembly structure has better sealing performance and ensures the quality of the finished product.

10‧‧‧Substrate

11‧‧‧Cylindrical capacitor winding body

12‧‧‧Insert pin

120‧‧‧Long pole

121‧‧‧Connecting Department

13‧‧‧Outer pin

130‧‧‧Outer lead seat

131‧‧‧electrode

132‧‧‧ first body

133‧‧‧Second body

14‧‧‧Insulation package

15‧‧‧First outer pin piece

151‧‧‧First Turning Department

152‧‧‧Second turning section

153‧‧‧electrode

16‧‧‧Second outer pin piece

161‧‧‧First Turning Department

162‧‧‧Second turning

163‧‧‧electrode

17‧‧‧First outer lead seat

100‧‧‧Solid electrolytic capacitor

Figure 1: Schematic diagram of the process of this creative system.

Figure 2: Schematic diagram of the end face of the substrate in the authoring process.

Figure 3: Schematic diagram of the substrate in this authoring process (1).

Figure 4: Schematic diagram of the substrate in this authoring process (2).

Figure 5: Schematic diagram of the truncation of the long pole in this creative method (1).

Figure 6: Schematic diagram of the truncation of the long pole in this creative method (2).

Figure 7: Schematic diagram of the connection between the inner pin and the outer pin in the authoring method (1).

Figure 8: Schematic diagram of the connection between the inner pin and the outer pin in the authoring method (2).

Figure 9: Schematic diagram of the bent outer pin piece in the authoring method.

Figure 10 is a plan view showing a first preferred embodiment of the solid electrolytic capacitor of the present invention.

Figure 11 is a perspective view showing the appearance of a first preferred embodiment of the solid electrolytic capacitor of the present invention.

Fig. 12 is a perspective view showing the appearance of a second preferred embodiment of the solid electrolytic capacitor of the present invention.

Figure 13 is a plan view showing the third preferred embodiment of the present invention in which the inner lead piece is connected to the outer lead piece.

Figure 14 is a perspective view showing the appearance of a third preferred embodiment of the solid electrolytic capacitor of the present invention.

Figure 15 is a plan view showing the fourth preferred embodiment of the present invention in which the inner lead piece is connected to the outer lead piece.

Figure 16 is a perspective view showing the appearance of a fourth preferred embodiment of the solid electrolytic capacitor of the present invention.

Please refer to FIG. 1 for the fabrication flow chart of the solid electrolytic capacitor of the present invention, and with reference to FIG. 2 to FIG. 4, firstly, a substrate 10 (step 101) is prepared, and the substrate 10 includes a cylindrical capacitor coil. The winding body 11 and the two inner lead pieces 12 have opposite first end faces and second end faces, and one end of each inner lead piece 12 is inserted in the cylindrical capacitor winding In the body 11, the other ends of the two inner lead pieces 12 extend outward from the first end surface of the cylindrical capacitor winding body 11 to respectively connect a long rod 120. The cylindrical capacitor winding body 11 is mainly formed by an anode foil, a cathode foil and a separator layer which are alternately insulated and arranged, and then wound and formed on a winding needle. The two inner lead pieces 12 are respectively located at the same. The two opposite outer sides of the cylindrical capacitor winding body 11 are electrically connected to the anode foil and the cathode foil, respectively, wherein the inner lead piece 12 may be a member made of aluminum.

Referring to FIG. 1 and FIG. 4 to FIG. 6 , the long rods 120 are cut off by a cutter or a cutting device, and the inner lead pieces 12 are exposed on the first end surface of the cylindrical capacitor winding body 11 . An interface portion 121 is formed (step 102). In the step of the truncation, since the two inner lead pieces 12 extend outward from the same end surface of the cylindrical capacitor winding body 11, the two long rods 120 can be simultaneously cut by the cutter or the cutting device, thereby saving time; Furthermore, since the two inner lead pieces 12 are located on opposite sides of the cylindrical capacitor winding body 11 and have a relatively long pitch, the two inner lead pieces 12 do not contact each other, so that a short circuit is not caused. .

After the long rod 120 is cut off, as shown in FIG. 7 and FIG. 8 , a sheet-like outer lead piece 13 is respectively connected to the connecting portion 121 of the two inner lead pieces 12 (step 103). The lead piece 13 can be connected to the inner side surface or the outer side surface of the engaging portion 121. This embodiment is described by taking the outer side surface of the engaging portion 121 as an example. As shown in FIG. 7, an outer pin holder 130 is provided with a plurality of outer lead pieces 13 arranged at intervals. In this case, the plurality of outer pin pieces 13 on the two outer pin holders 130 can be respectively connected by automatic mechanical devices. The joint portion 121 of the two inner lead pieces 12 on the plurality of cylindrical capacitor winding bodies 11 achieves a large number of manufacturing purposes. In the preferred embodiment, the inner lead piece 12 and the outer lead piece 13 are connected by soldering, and the outer lead piece 13 may be a member made of tin.

After connecting the outer lead piece 13, as shown in FIG. 9, the outer lead piece 13 can be bent outwardly by the operator by hand or by using an automated mechanical device to bend the outer lead piece 13 and the inner lead. The angle between the legs 12 is a right angle (step 104).

After the outer lead piece 13 is bent, the filling and encapsulating step is performed, and each of the cylindrical capacitor winding bodies 11 is placed in a rectangular cavity of the mold, and when the cavity is filled with the sealing glue, the sealing system is sealed. The cylindrical capacitor winding body 11 is covered, and the outer lead pieces 13 are adhered by the adhesiveness of the sealant. Since the outer lead frame 130 is connected to the plurality of cylindrical capacitor winding bodies 11 at the same time, the mold can form a plurality of cavity portions correspondingly to simultaneously fill the plurality of cylindrical capacitor winding bodies 11 to achieve mass production. purpose. After the sealant is cured, a rectangular insulating package is formed to cover the cylindrical capacitor winding body 11, as shown in FIG. 9 to FIG. 11 , and finally cut off by the cutter or the cutting device to expose the insulating package 14 . The outer leadframe 130 separates the insulative packages 14 to form separate entities, completing the solid electrolytic capacitor 100 (step 105). As shown in FIG. 11, the solid electrolytic capacitor 100 includes an insulating package 14 and a cylindrical capacitor winding body 11 disposed in the insulating package 14, and the cylindrical capacitor winding body 11 is provided. There are two oppositely disposed inner lead pieces, and the connecting portions 121 of the two inner lead pieces are respectively connected to an outer lead piece 13, and the outer lead pieces 13 are exposed on the surface of the insulating package 14 to form an electrode. 131, and the electrodes 131 are only located on one surface of the insulating package 14 and are coplanar with the surface.

In the second preferred embodiment, the length of the outer lead piece 13 is longer than the length of the outer lead in the first preferred embodiment, and is preset to be larger than the side length of the insulating package 14, and the two are bent. In the step of the outer lead piece 13, the two outer lead pieces 13 are further bent toward the second end surface of the cylindrical capacitor winding body 11, so that the middle portion of the outer outer lead pieces 13 is located in the cylinder The outer side of the outer capacitor piece 11 is bent inwardly and parallel to the second end surface of the cylindrical capacitor winding body 11; then the solid electrolytic capacitor is completed after the 105th step Production. Referring to FIG. 12, the solid electrolytic capacitor 100 includes an insulating package 14 and a cylindrical capacitor winding body 11 disposed in the insulating package 14. The cylindrical capacitor winding body 11 is provided with two The inner lead pieces are oppositely disposed, and the connecting portions 121 of the inner inner lead pieces are respectively connected to an outer lead piece 13 , and the outer lead pieces 13 extend from the first end surface of the insulating package 14 to the opposite end Two end faces. In this way, the electrodes 131 are formed on the opposite end faces and the side faces of the solid electrolytic capacitor 100, and can be provided in accordance with the needs of the user, providing a wide range of uses.

In the third preferred embodiment, referring to FIG. 13, when the step 103 is used to connect the connecting portion 121 of the inner lead piece 12 to the outer lead piece 13, each outer lead piece 13 includes a first piece. The body 132 is coupled to a second body 133. One end of the first body 132 is connected to the engaging portion 121 of the inner lead piece 12 and has the same extending direction, and the other end of the first piece 132 is connected to the second piece. At the center of the 133, the length of the second body 133 can be preset to the length of the side of the insulating package 14. Then, in the step 104, the two sheets 132 and 133 are bent outward, and the second sheet 133 is bent perpendicular to the first sheet 132 and the inner lead piece 12. The fabrication of the solid electrolytic capacitor is completed after the step of filling the mold package and cutting off the outer lead seat in the step 105. Referring to FIG. 14 , the solid electrolytic capacitor 100 includes an insulating package 14 and a cylindrical capacitor winding body 11 disposed in the insulating package 14 . The cylindrical capacitor winding body 11 is provided with two The inner lead pieces are oppositely disposed, and the connecting portions 121 of the two inner lead pieces are respectively connected to an outer lead piece 13 , and each outer lead piece 13 includes a first piece 132 and a second which are perpendicular to each other. The first body 132 is connected to the connecting portion 121 of the inner lead piece, and the second piece 133 is exposed to a surface of the insulating package 14. The surface 131 is formed to form the electrode 131, and the surfaces of the two electrodes 131 and the insulating package 14 are coplanar. Compared with the first preferred embodiment, the electrode 131 of the third preferred embodiment has a large conductive area.

In the fourth preferred embodiment, as shown in FIG. 15, the two outer lead pieces are respectively a first outer lead piece 15 and a second outer lead piece 16 having opposite turning directions. The lead piece 15 is connected to the first outer lead seat 17 via the first and second turning portions 151 and 152. The second outer lead piece 16 passes through the first turning portion (not shown) and the second turning portion 162. The second outer lead seat (not shown) is connected, and the turning direction of the first turning portion of the second outer lead piece 16 is opposite to the turning direction of the first turning portion 151 of the first outer lead piece 15. In the step 104, the two outer lead pieces 13 are bent toward the second end surface of the cylindrical capacitor winding body 11, and the bent portions 151 of the outer lead pieces 15, 16 are bent after being bent. 152 and 162 are respectively located outside the cylindrical capacitor winding body 11, and the ends of the outer lead pieces 15, 16 are further bent inward and parallel to the second end surface of the cylindrical capacitor winding body 11. Then, in the step 105, the steps of filling the mold package and cutting off the outer lead seat are completed, and the fabrication of the solid electrolytic capacitor is completed.

Referring to FIG. 16, the solid electrolytic capacitor 100 includes an insulating package 14 and a cylindrical capacitor winding body 11 disposed in the insulating package 14. The cylindrical capacitor winding body 11 is provided with two The inner lead pieces are oppositely disposed, and the connecting portions 121 of the two inner lead pieces are respectively connected to the outer lead pieces 15 and 16, and the ends of the outer outer lead pieces 15 and 16 respectively form electrodes 153 and 163, The turning direction of the first turning portion 161 of the second outer lead piece 16 is opposite to the turning direction of the first turning portion 151 of the first outer lead piece 15, so that the two electrodes 153, 163 are respectively located at opposite corners of the end surface of the rectangular insulating package 14. Position, and the surfaces of the two outer lead pieces 15, 16 are coplanar with the surface of the insulating package 14. Since the insulating package 14 is a rectangular cube, the cylindrical capacitor winding body 11 has a cylindrical shape, and when the cylindrical capacitor winding body 11 is disposed in the insulating package 14, the cylindrical capacitor winding body The outer side of the 11 and the corner of the insulating package 14 have the largest pitch, and the two outer lead pieces 15 and 16 can be disposed to meet the requirement of component shrinkage.

In summary, the present invention forms an insulating package to cover the cylindrical capacitor winding body, and the sealing property of the insulating package prevents the outside water from entering the insulating package, thereby ensuring the quality of the finished product.

Claims (8)

A method for manufacturing a solid electrolytic capacitor, comprising the steps of: preparing a plurality of substrates, each of the substrates comprising a cylindrical capacitor winding body and two inner lead pieces interposed on the cylindrical capacitor winding body The cylindrical capacitor winding body has a first end surface and a second end surface, and the inner lead pieces are exposed at the first end surface of the cylindrical capacitor winding body to form an engaging portion; An outer lead piece is connected to the connecting portion of each of the inner lead pieces of the substrate, and the outer lead piece is disposed on an outer lead frame, wherein each inner lead piece of the substrate passes through The corresponding outer lead piece is connected to the outer lead seat; respectively, the outer lead piece connected to each of the base materials is bent outwardly, so that the bent outer lead piece and the inner lead piece are bent The angle between the two is a straight angle; the cylindrical capacitor winding bodies are respectively placed in the plurality of mold cavities of the mold through the outer lead seat to perform a filling and encapsulating step to form a plurality of rectangular insulating packages, each of which The insulating package encloses each of the cylindrical capacitor winding body and two inner lead pieces, and the two outer leads The sheet is exposed to each of the insulating packages, wherein the two outer lead pieces are coplanar and continuously unseparated from the surface of each of the insulating packages; and the outer lead holders exposed to the respective insulating packages are cut off to separate The insulating packages form a plurality of solid electrolytic capacitors. The method of manufacturing the solid electrolytic capacitor according to claim 1, wherein in the step of bending the two outer lead pieces, the two outer lead pieces are further bent toward the second end surface of the cylindrical capacitor winding body, And bending the ends of the two outer lead pieces inwardly parallel to the second end surface of the cylindrical capacitor winding body; in the step of forming the insulating package, the outer lead pieces are from the insulating package One end extends to the opposite end. The method of manufacturing the solid electrolytic capacitor according to claim 1, wherein in the step of connecting the outer lead piece, each outer lead piece comprises a first piece and a second piece, and the first piece has one end and the inner side. The connecting portions of the lead pieces are connected and have the same extending direction; in the step of bending the outer lead pieces, the second piece is bent perpendicular to the first piece and the inner lead piece; In the step of the package, the second sheet system is exposed on the surface of the insulating package and is coplanar with the surface of the insulating package. The method of manufacturing the solid electrolytic capacitor according to claim 1, wherein in the step of connecting the outer lead piece, the two outer lead pieces are respectively a first outer lead piece and a second outer lead piece, the first outer part The turning direction of the lead piece is opposite to the turning direction of the second outer lead piece; in the step of bending the outer lead piece, after bending, the turning part of each outer lead piece is respectively located in the cylindrical capacitor coil An outer side of the body, and an end of each outer lead piece is bent inwardly and parallel to the second end surface of the cylindrical capacitor winding body; in the step of forming the insulating package, the two outer lead pieces are The ends are respectively located at diagonal positions of the insulating package. A solid electrolytic capacitor is produced by the method of the solid electrolytic capacitor of claim 1, the solid electrolytic capacitor comprising: a cylindrical capacitor winding body having a first end surface and a second end surface; The leg piece is disposed in the cylindrical capacitor winding body and exposed on the first end surface, and the two inner lead pieces are exposed at the portion of the cylindrical capacitor winding body to form an connecting portion respectively; The legs are respectively connected to the connecting portions of the two inner lead pieces, and the outer lead pieces are bent outwardly and at right angles with the angle between the inner lead pieces; An insulating package enclosing a rectangular capacitor winding body and the two inner lead pieces, the outer lead pieces being exposed to the insulating package to form an electrode, and the two The outer lead piece and the surface of the insulating package are coplanar and continuously unseparated. The solid electrolytic capacitor according to claim 5, wherein a middle portion of each of the outer lead pieces is located outside the cylindrical capacitor winding body, and an end of each of the outer lead pieces is wound parallel to the cylindrical capacitor The second end surface of the body is such that the electrodes formed by the outer lead pieces extend from one end surface of the insulating package to the opposite end surface. The solid electrolytic capacitor according to claim 5, wherein each of the outer lead pieces comprises a first body and a second body which are perpendicular to each other, and one end of the first body and each of the inner pins The connecting portions are connected and have the same extending direction, the other end of the first sheet is connected to the center of the second sheet, the second sheet is perpendicular to the first sheet and the inner lead piece; the second The sheet is exposed to the surface of the insulating package to form the electrode. The solid electrolytic capacitor according to claim 5, wherein the two outer lead pieces are a first outer lead piece and a second outer lead piece, and the first outer lead piece and the second outer lead piece are respectively Each of the two outer turning pieces has a turning direction opposite to a turning direction of the second outer lead piece, wherein the first outer lead piece and the second outer lead piece have a turning part The first outer lead piece and the second outer lead piece are respectively parallel to the second end surface of the cylindrical capacitor winding body and respectively located at the outer side of the cylindrical capacitor winding body The diagonal position of the end face of the insulating package.