Disk-type capacitor encapsulant

Abstract

The present invention relates to a sealing material to be attached to a capacitor, and more specifically to a sealing material characterized by comprising a metal disk, a coating body covering the outer surface of the disk, and a hole formed in the coating body through which a lead wire passes.

Description

[Technical Field]

[0001] The present invention relates to a sealing material for sealing the lower opening of a capacitor, and more particularly to a sealing material comprising a metal disk, a coating covering the outer surface of the disk, and a hole formed in the coating through which a lead wire passes. [Background technology]

[0002] Generally, an electrolytic capacitor stores an electrolyte in the form of liquid, solid, or gel inside a case, which is the main body of the capacitor. To prevent the electrolyte from leaking to the outside, a sealing material is attached to the bottom of the capacitor.

[0003] The sealing material is made of synthetic rubber and is generally circular in shape according to the appearance of the electrolytic capacitor, with a predetermined number of holes formed in the center for passing lead wires of the electrolytic capacitor.

[0004] When such electrolytic capacitors are used for high power applications, there is a risk that the electrolyte may leak out of the case due to the expansion of the electrolyte caused by an increase in the temperature of the internal electrolyte. To address this, a known technique is disclosed in Korean Patent Publication No. 10-2010-0123000, which discloses a sealing material for an aluminum electrolytic capacitor and a method of manufacturing the same, in which holes 3 for passing lead wires are formed in the body 1 of the electrolytic capacitor and a stainless steel reinforcing material 2 is attached to the upper side of the body 1 to increase the rigidity of the sealing material, as shown in FIG. 1. [Patent Document 1] Korean Patent Publication No. 10-2010-0123000

[0005] However, in the prior art, the material of the reinforcing member 2 attached to the upper side of the body 1 is stainless steel, which has the disadvantage of weak insulation with other parts such as lead wires. In particular, it is difficult to replace bakelite, which is used as a sealing material for high-power capacitors. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Patent Publication No. 10-2010-0123000 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been devised to solve the above-mentioned conventional problems, and a technical object of the present invention is to provide a capacitor sealing material having excellent insulating properties while maintaining a rigidity sufficient for use in high-power capacitors, and which can replace the well-known Bakelite sealing material used in high-power capacitors. [Means for solving the problem]

[0008] In order to achieve the above technical objectives, the capacitor sealing material of the present invention is characterized by comprising a metal disk, a coating covering the outer surface of the disk, and a hole formed in the coating through which a lead wire passes. [Effects of the Invention]

[0009] The capacitor sealing material of the present invention having the above-mentioned structure has the advantage of being excellent in insulation because the outer peripheral surface of the disk is covered with a covering portion made of rubber material.

[0010] Another advantage is that it can replace bakelite, which has been used in conventional high-power capacitors.

[0011] Furthermore, by forming a protrusion on the metal disk, the rigidity of the sealing material itself is increased, which is advantageous for application to high-power capacitors.

[0012] Furthermore, by exposing a portion of the surface of the disk on the upper surface of the sealing material, any deviation or tilt of the disk can be confirmed with the naked eye, which has the effect of facilitating quality control. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 10 is a perspective view of a capacitor sealing material having a conventional reinforcing material. [Figure 2] FIG. 2 is a plan view of a plugging material according to an embodiment of the present invention. [Figure 3] FIG. 2 is a cross-sectional view of a plugging material according to an embodiment of the present invention. [Figure 4] FIG. 2 is a perspective view of a disk of a sealing material according to an embodiment of the present invention. [Figure 5] FIG. 2 is a plan view of a disk of a sealing material according to an embodiment of the present invention. [Figure 6] FIG. 2 is a cross-sectional view of a disk of a sealing material according to an embodiment of the present invention. [Figure 7] FIG. 10 is a plan view of a plugging material according to another embodiment of the present invention. [Figure 8] FIG. 10 is a cross-sectional view of a plugging material according to another embodiment of the present invention. [Figure 9] FIG. 10 is a perspective view of a disk of a sealing material according to another embodiment of the present invention. [Figure 10] FIG. 10 is a plan view of a disk of a sealing material according to another embodiment of the present invention. [Figure 11] FIG. 10 is a cross-sectional view of a disk of a sealing material according to another embodiment of the present invention. [Figure 12a] FIG. 10 is a diagram showing a state in which a plugging material according to another embodiment of the present invention is used without being chamfered. [Figure 12b] FIG. 10 is a diagram showing a state in which a chamfering process is performed on a plugging material according to another embodiment of the present invention; [Figure 13a] FIG. 10 is a diagram showing a state in which a protrusion is not formed in a hole of a sealing material according to another embodiment of the present invention. [Figure 13b] FIG. 10 is a diagram showing a state in which a protrusion is formed on a hole in a sealing material according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] The configuration of the disk-containing capacitor sealing material of the present invention will be described below with reference to the drawings.

[0015] However, the disclosed drawings are provided as examples to fully convey the concept of the present invention to those skilled in the art, and therefore the present invention is not limited to the drawings presented below and may be embodied in other forms.

[0016] Furthermore, unless otherwise defined, terms used in the specification of the present invention have the meanings that are commonly understood by a person having ordinary knowledge in the technical field to which the present invention belongs, and detailed descriptions of known functions and configurations that unnecessarily obscure the gist of the present invention will be omitted in the following description and accompanying drawings. [Example]

[0017] Figure 2 is a plan view of a sealing material according to an embodiment of the present invention, Figure 3 is a cross-sectional view of a sealing material according to an embodiment of the present invention, Figure 4 is an oblique view of a disk of a sealing material according to an embodiment of the present invention, and Figure 5 is a plan view of a disk of a sealing material according to an embodiment of the present invention.

[0018] Referring to the drawings, in the capacitor sealing material 10 of the embodiment of the present invention, the outer peripheral surfaces of the front and back surfaces of the disk 20 are covered with a coating 30, and a hole 40 is drilled in the center of the coating 30 through which the lead wire of the capacitor passes.

[0019] The disk 20 has a flat body 21 and a protrusion 22 protruding upward from the surface of the body 21.

[0020] The protrusion 22 is formed in the shape of a circular closed curve extending along the circumference of the body 21, and a through-hole 23 is formed in the center of the body 21 to allow the lead wire that has passed through the hole 40 in the coating 30 to pass through.

[0021] At this time, the upper surface of the protrusion 22 is processed so as not to be covered by the covering body 30 , and the upper surface of the protrusion 22 is exposed to the upper surface of the sealing material 10 .

[0022] Preferably, the disc 20 is made of a stainless steel material and the cover 30 is made of a rubber material.

[0023] Meanwhile, in the embodiment of the present invention, the thickness (t) of the disk 20 was 0.8 mm, the total height (h) was 2.0 mm, and the thickness (T) of the cover 30 was 3.0±0.1 mm.

[0024] The stainless steel is a steel containing elements such as chromium, carbon, nickel, tungsten, vanadium, copper, and silicon, and has excellent properties such as strength, corrosion resistance, and rust prevention.

[0025] Meanwhile, the material of the disc 20 may be any one of aluminum, titanium, and carbon fiber in addition to stainless steel.

[0026] The rubber material of the cover 30 may be a synthetic rubber material whose main raw material is isobutylene-isoprene rubber (IIR), and the cover 30 is coated on the front and back surfaces of the disk 20 by performing a material-spraying step to form the cover 30 to a thickness used as a sealing material.

[0027] Meanwhile, the rubber material of the cover 30 may be any one of natural rubber (NR), styrene butadiene rubber (SBR), ethylene propylene diene monomer (EPDM), polybutadiene rubber (BR), nitrile butadiene rubber (NBR), silicone rubber (Q), acrylic elastomers (ACM, ANM), fluoroelastomers (FPM), hydrogenated nitrile butadiene rubber (HNBR), polyurethane (UR), and thermoplastic elastomer (TPE).

[0028] Therefore, in the sealing material 10 of the present invention, the rubber covering 30 covers the periphery of the hole 40 on a flat surface, and insulation from the lead wire passing through the hole 40 is ensured.

[0029] Furthermore, the disk 20 inserted into the sealing material 10 has a shape that increases rigidity due to the protrusions 22 formed on the body 21, and prevents the sealing material 10 from changing shape due to pressure resistance.

[0030] At the same time, since the upper surface of the protrusion 22 of the disk 20 is exposed on the upper surface of the sealing material 10, any deviation or tilt of the disk 20 inserted inside can be confirmed with the naked eye, making quality control easy.

[0031] Table 1 below shows the measured bending strength of the disk 20 used in the sealing material 10 of an embodiment of the present invention. As comparative examples, the bending strength of a sealing material made of a synthetic material of rubber and phenolic resin (Comparative Example 1) and a sealing material made of SUS304 steel metal (Comparative Example 2) were also measured. [Table 1] Referring to Table 1, the disk 20 used in the plugging material of the embodiment of the present invention has a 79% improvement in lateral bending strength compared to a plugging material made of steel metal, and a 94% improvement in vertical bending strength compared to a plugging material made of steel metal, and the plugging material 10 of the present invention with such a disk 20 inserted inside has the effect of having excellent rigidity.

[0032] In addition, an immersion test was conducted on the plugging material 10 of the embodiment of the present invention, and the results are shown in Table 2 below. As a comparative example, an immersion test was also conducted on a plugging material (Comparative Example 1) made of a synthetic material of rubber and phenolic resin. [Table 2] *Note: Immersion test conditions: 105℃, 96 hours Referring to Table 2, the change in the sealing material of the present invention after immersion was significantly lower than that of Comparative Example 1, which indicates that the sealing material itself hardly causes immersion and has an excellent effect of preventing electrolyte leakage. [Example]

[0033] Figure 7 is a plan view of a sealing material of another embodiment of the present invention, Figure 8 is a cross-sectional view of a sealing material of another embodiment of the present invention, Figure 9 is an oblique view of a disk of a sealing material of another embodiment of the present invention, Figure 10 is a plan view of a disk of a sealing material of another embodiment of the present invention, and Figure 11 is a cross-sectional view of a disk of a sealing material of another embodiment of the present invention.

[0034] In another embodiment of the sealing material 100 of the present invention, the outer peripheral surfaces of the front and back surfaces of the disk 120 are covered with a coating 130, a hole 140 is drilled in the center of the coating 130 through which the lead wire of the capacitor passes, and a groove 150 is formed to a predetermined depth from the top surface of the coating 130, so that the top surface of the disk 120 is exposed through the groove 150.

[0035] The disk 120 includes a flat body 121 and a protrusion 122 that protrudes upward from the surface of the body 121.

[0036] The protrusion 122 is formed in a circular open curve shape with an open portion extending along the circumference of the body 121, and unlike the previous embodiment, the upper surface of the protrusion 122 is covered with a covering 130.

[0037] A through hole 123 is formed in the center of the body 121 of the disk 120 to allow the lead wires that have passed through the hole 140 to pass through.

[0038] The groove 150 is formed in the shape of a circular open curve extending along the circumference of the body 121, similar to the protrusion 122, with a partially open circular shape.

[0039] Preferably, the disc 120 is made of a stainless steel material and the cover 130 is made of a rubber material.

[0040] Meanwhile, in another embodiment of the present invention, the thickness (t1) of the disk 120 was 0.8 mm, the overall height (h1) was 1.7 mm, and the thickness (T1) from the front to the back of the coating 30 was 3.0 mm.

[0041] The material of the disc 120 may be any one of aluminum, titanium, and carbon fiber in addition to stainless steel.

[0042] The rubber material of the cover 130 may be a synthetic rubber material whose main raw material is isobutylene-isoprene rubber (IIR), as in the previous embodiment, and is applied to the front and back surfaces of the disk 120 by performing a material extrusion step to form the cover 130 to a thickness used as a sealing material.

[0043] Meanwhile, the rubber material of the cover 30 may be any one of natural rubber (NR), styrene butadiene rubber (SBR), ethylene propylene diene monomer (EPDM), polybutadiene rubber (BR), nitrile butadiene rubber (NBR), silicone rubber (Q), acrylic elastomers (ACM, ANM), fluoroelastomers (FPM), hydrogenated nitrile butadiene rubber (HNBR), polyurethane (UR), and thermoplastic elastomer (TPE).

[0044] Therefore, in the sealing material 100 of another embodiment of the present invention, the hole 140 is covered on a flat surface with a rubber covering 130, thereby ensuring insulation from the lead wire passing through the hole 140.

[0045] Furthermore, the disk 120 inserted into the sealing material 100 has a shape that increases rigidity due to the protrusions 122 formed on the body 121, thereby preventing the sealing material 100 from changing shape due to pressure resistance.

[0046] In addition, in another embodiment of the sealing material 100 of the present invention, the upper surface of the disk 120 is exposed through a groove 150 on the upper surface, so that the deviation and tilt of the disk 120 inserted inside can be confirmed with the naked eye, making quality control easy.

[0047] In addition, in the plugging material 100 according to another embodiment of the present invention, the corners of the lower part of the covering 130 are chamfered in a shape that is inclined from the side surface of the covering 130 toward the bottom surface (so-called "C" chamfering).

[0048] By chamfering the lower corners of the coating 130, the sealing material 100 can be easily attached to the side curling portion P inside the capacitor case CA, thereby improving the productivity and yield of the capacitor.

[0049] In other words, if the lower corners of the coating 130 are not chamfered, as shown in Figure 12a, when the encapsulant 100 is inserted into the top of the capacitor case CA, the lower part of the coating 130, which is made of rubber, slides along the inclined surface of the side curling portion P of the case CA, causing the encapsulant 100 to bond at an angle, which can reduce productivity and yield. However, if the lower corners of the coating 130 are chamfered, as shown in Figure 12b, the lower part of the coating 130 is accurately bonded to the side curling portion P inside the case CA, improving productivity and yield. Furthermore, the chamfered portion of the lower part of the coating 130 has a wider contact area with the side curling portion P inside the case CA, thereby improving the airtightness of the encapsulant 100.

[0050] Furthermore, in the sealing material 100 of another embodiment of the present invention, a protrusion 141 is formed so that the frame portion of the hole 140 in the covering body 130 protrudes upward from the surface of the covering body 130 .

[0051] When the terminal T is connected to the upper side of the hole 140 on the surface of the sealing material 100 and the rivet R is connected to the lower side of the hole 140 on the back side of the sealing material 100, the protrusion 141 supports the pushing force when the terminal T and the rivet R are compressed, thereby preventing the terminal T and the rivet R from getting inside the sealing material 100.

[0052] In other words, if protrusion 141 is not formed on the frame portion of hole 140, as shown in Figure 13a, the pushing force applied when terminal T and rivet R are compressed will cause terminal T and rivet R to penetrate into the rubber of coating 130 of sealing material 100, thereby thinning the thickness of coating 130 at the compressed portion of terminal T and rivet R. However, if protrusion 141 is formed on the frame portion of hole 140, as shown in Figure 13b, protrusion 141 formed on the frame portion of hole 140 will support the pushing force applied when terminal T and rivet R are compressed, preventing terminal T and rivet R from penetrating into sealing material 100, and preventing the thickness of coating 130 at the compressed portion of terminal T and rivet R from becoming thin. This not only improves the airtightness of sealing material 100, but also eliminates the need to form sealing material 100 thick, thereby improving the flexibility of the internal space of the capacitor and further increasing the capacitance of the capacitor. [Explanation of symbols]

[0053] 10: Plugging material according to an embodiment of the present invention 20:Disc 21: Body 22: Protrusion 23:Through hole 30: Covering body 40: Hole 100: Another embodiment of the sealing material of the present invention 120:Disc 121: Body 122:Protrusion 123:Through hole 130: Covering body 140: Hole 141: Protrusion 150: Groove

Claims

1. In capacitor sealing materials, Metal disc and a coating body coated on the outer peripheral surface of the disk; A sealing material characterized in that it is formed in the covering body and includes a hole through which a lead wire passes.

2. The disk is Flat body and a protrusion protruding upward on the surface of the body; a through hole formed in the center of the body; The sealing material according to claim 1 , wherein an upper surface of the protrusion is processed so as not to be covered by a covering body, and the upper surface of the protrusion is exposed on an upper surface of the sealing material.

3. The disc is made of stainless steel, The sealing material according to claim 2 , wherein the covering body is made of a rubber material.

4. In capacitor sealing materials, Metal disc and a coating body coated on the outer peripheral surface of the disk; a hole formed in the covering body through which a lead wire passes; forming a groove having a predetermined depth from the upper surface of the cover; The sealing material is characterized by a configuration in which the top surface of the disk is exposed through the groove.

5. The disk is Flat body and a protrusion protruding upward on the surface of the body; a through hole formed in the center of the body; The sealing material according to claim 4 , wherein an upper surface of the protrusion is covered with a covering.

6. The disc is made of stainless steel, The sealing material according to claim 5 , wherein the covering body is made of a rubber material.

7. 6. The plugging material according to claim 5, wherein the corners of the lower part of the cover are chamfered in a shape inclined from the side surface to the bottom surface of the cover.

8. The sealing material according to claim 5 , wherein a protrusion is formed on a frame portion of the hole in the cover so as to protrude upward from the surface of the cover.

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