CN117410102A - Tantalum capacitor - Google Patents
Tantalum capacitor Download PDFInfo
- Publication number
- CN117410102A CN117410102A CN202311706400.XA CN202311706400A CN117410102A CN 117410102 A CN117410102 A CN 117410102A CN 202311706400 A CN202311706400 A CN 202311706400A CN 117410102 A CN117410102 A CN 117410102A
- Authority
- CN
- China
- Prior art keywords
- tantalum
- wire
- seat plate
- anode lead
- metal seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 229910052715 tantalum Inorganic materials 0.000 title claims abstract description 73
- 239000003990 capacitor Substances 0.000 title claims abstract description 47
- 229910052751 metal Inorganic materials 0.000 claims abstract description 60
- 239000002184 metal Substances 0.000 claims abstract description 60
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000005219 brazing Methods 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 10
- 239000011324 bead Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims 1
- 238000001354 calcination Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 8
- 239000004033 plastic Substances 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 238000009413 insulation Methods 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910052718 tin Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 150000003481 tantalum Chemical class 0.000 description 2
- 239000011135 tin Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910000484 niobium oxide Inorganic materials 0.000 description 1
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/08—Housing; Encapsulation
Abstract
A tantalum capacitor comprises a tantalum main body, a tantalum wire, a metal seat plate and a metal shell, wherein one end of the tantalum wire is arranged in the tantalum main body, and the other end of the tantalum wire extends out of the tantalum main body; the tantalum main body and the tantalum wire are hermetically arranged in the shell by the metal seat plate, and the anode lead-out assembly and the cathode lead-out assembly are arranged on the metal seat plate; the anode lead-out assembly and the lead-out assembly respectively comprise an anode lead-out wire and a cathode lead-out wire; one end of the anode lead wire is electrically connected with the tantalum wire, and the other end of the anode lead wire penetrates through the metal seat plate, and the anode lead wire and the metal seat plate are arranged in an insulating way. According to the invention, the plastic package material is replaced by the metal shell and the metal seat plate, so that water vapor can be better prevented from entering the product, and the high-temperature and high-humidity tolerance of the tantalum capacitor is improved.
Description
Technical Field
The invention relates to a tantalum capacitor, in particular to a tantalum capacitor with good packaging air tightness.
Background
There are two types of conventional tantalum capacitors, namely a hard metal tantalum capacitor and a polymer tantalum capacitor, but any one of the tantalum capacitors uses epoxy resin as an encapsulating material.
As shown in fig. 1, the structure of the tantalum capacitor is mainly composed of three parts: tantalum foil, insulating layer and terminal. Tantalum foil is the most important part of tantalum capacitors, which is made of pure tantalum metal and has a rectangular or circular shape. Tantalum foil is typically only a few microns thick, but its capacitance is very large. The size and shape of the tantalum foil can be tailored to the requirements of the capacitor. The insulating layer is a very important part of the tantalum capacitor and is made of an insulating material with a high dielectric constant. The thickness of the insulating layer is very thin, only a few microns, but its dielectric constant is very high, which can significantly increase the capacitance of the tantalum capacitor. The insulating layer is typically made of aluminum oxide, aluminum nitride, or niobium oxide. Terminals are another important part of tantalum capacitors that allow the tantalum capacitors to be connected to other electronic components. The terminals are typically made of silver, gold or copper, and sometimes are plated with a layer of tin or nickel to prevent oxidation. The terminals of the tantalum capacitor can be pins directly inserted into the circuit board or surface-mounted terminals welded on the circuit board.
Because the plastic package material is not completely waterproof, the plastic package material has water absorbability, and after reflow soldering during mounting, gaps can occur at joints due to different expansion coefficients and expansion and contraction between the plastic package material and the lead-out terminals. Under the high-temperature and high-humidity conditions, water vapor or air can pass through the joint gap and the plastic package material body to enter the core, so that the product characteristic is deteriorated. Therefore, how to design and manufacture a tantalum capacitor with high reliability, which can better ensure the air tightness of the package, becomes a technical problem to be solved.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing a tantalum capacitor with good packaging air tightness.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a tantalum capacitor comprises a tantalum main body, a tantalum wire, a metal seat plate and a metal shell, wherein one end of the tantalum wire is arranged in the tantalum main body, and the other end of the tantalum wire extends out of the tantalum main body; the metal seat plate is used for sealing the tantalum main body and the tantalum wire in the shell, and an anode lead-out assembly and a cathode lead-out assembly are arranged on the metal seat plate; the anode lead-out assembly and the lead-out assembly respectively comprise an anode lead-out wire and a cathode lead-out wire; one end of the anode lead wire is electrically connected with the tantalum wire, the other end of the anode lead wire penetrates through the metal seat plate, and the anode lead wire and the metal seat plate are arranged in an insulating mode.
In the tantalum capacitor, preferably, a ceramic ring is disposed between the anode lead and the metal base plate, and the ceramic ring is connected with the metal base plate by brazing.
In the tantalum capacitor, the anode lead wire is preferably connected to the ceramic ring by brazing.
In the tantalum capacitor, preferably, an airtight structure is formed between the anode lead and the metal base plate by firing glass beads.
In the tantalum capacitor, preferably, an insulating spacer is disposed below a portion of the tantalum wire connected to the anode lead wire.
In the tantalum capacitor, the cathode lead is preferably connected to the metal base plate by brazing.
In the tantalum capacitor, preferably, an insulating base is disposed at the bottom of the metal seat plate, and the anode lead wire and the cathode lead wire penetrate through the metal seat plate and the insulating seat plate and then are bent and attached to the bottom of the insulating seat plate.
In the tantalum capacitor, preferably, the cathode lead wire includes a cathode shrapnel, and the cathode shrapnel is electrically connected with the tantalum main body.
In the tantalum capacitor, preferably, the cathode elastic sheet buckles the tantalum main body.
In the tantalum capacitor, preferably, the cathode shrapnel is electrically connected with the tantalum main body through conductive paste.
Compared with the prior art, the invention has the advantages that: according to the invention, the plastic package material is replaced by the metal shell and the metal seat plate, so that water vapor can be better prevented from entering the product, and the high-temperature and high-humidity tolerance of the tantalum capacitor is improved.
Drawings
Fig. 1 is a structure of a conventional tantalum capacitor in the background art.
Fig. 2 is a schematic diagram showing a sectional structure of a tantalum capacitor in example 1.
Fig. 3 is a schematic diagram showing the bottom structure of a tantalum capacitor in example 1.
Description of the drawings
1. A tantalum body; 2. a tantalum wire; 3. a metal seat plate; 4. a metal housing; 5. an insulating spacer; 6. an anode lead-out wire; 7. cathode lead-out wire; 71. a cathode spring plate; 72. externally connecting a lead; 8. a ceramic ring; 9. brazing; 10. an insulating base.
Description of the embodiments
The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown, for the purpose of illustrating the invention, but the scope of the invention is not limited to the specific embodiments shown.
It will be understood that when an element is referred to as being "fixed, affixed, connected, or in communication with" another element, it can be directly fixed, affixed, connected, or in communication with the other element or intervening elements may be present.
Unless defined otherwise, all technical and scientific terms used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the scope of the present invention.
Examples
The tantalum capacitor comprises a tantalum main body 1, a tantalum wire 2, a metal seat plate 3 and a metal shell 4, wherein one end of the tantalum wire 2 is arranged in the tantalum main body 1, and the other end of the tantalum wire 2 extends out of the tantalum main body 1 and then is arranged on an insulating gasket 5; the tantalum main body 1 and the tantalum wire 2 are hermetically arranged in the shell by the metal seat plate 3, and the metal seat plate 3 and the metal shell 4 can be hermetically connected by welding; the metal seat board 3 is provided with an anode lead-out component and a cathode lead-out component; the anode lead-out assembly and the lead-out assembly respectively comprise an anode lead-out wire 6 and a cathode lead-out wire 7; one end of the anode lead-out wire 6 is electrically connected with the tantalum wire 2, the other end of the anode lead-out wire passes through the metal seat plate 3, and the anode lead-out wire 6 is arranged in an insulating way with the metal seat plate 3. An insulating spacer 5 is arranged below the connection part of the tantalum wire 2 and the anode lead wire 6. In the present embodiment, the insulating spacer 5 mainly functions to support the tantalum wire 2 and the cathode lead 7.
In this embodiment, the insulating seal arrangement between the anode lead-out wire 6 and the metal base plate 3 may be in the following ways:
the first mode is that a ceramic ring 8 is arranged between an anode lead-out wire 6 and a metal seat plate 3, and the ceramic ring 8 is connected with the metal seat plate 3 through brazing 9; the anode lead wire 6 is connected with the ceramic ring 8 through brazing 9.
The second method is to form an insulating sealing structure (not shown) by firing glass beads between the anode lead wire 6 and the metal base plate 3.
As shown in fig. 3, in order to further ensure the insulation performance between the anode lead-out wire 6 and the metal seat plate 3, an insulation base 10 is arranged at the bottom of the metal seat plate 3, and the anode lead-out wire 6 and the cathode lead-out wire 7 penetrate through the metal seat plate 3 and the insulation seat plate and then are bent and attached to the bottom of the insulation seat plate; the insulating base plate may be made of rubber. In this embodiment, the centers of the anode lead 6 and the cathode lead 7 may be made of aluminum, copper, or iron, and the surface plating layer may be made of nickel, cobalt, manganese, chromium, or tin.
In this embodiment, the cathode lead 7 includes a cathode spring 71 and an external lead 72, the cathode spring 71 is electrically connected to the tantalum body 1, and the external lead 72 extends out of the metal base plate 3. The cathode spring plate 71 is bent to be U-shaped to buckle the tantalum main body 1, and the external lead 72 is connected with the metal seat plate 3 through brazing 9. In this embodiment, the cathode spring 71 and the tantalum body 1 may be electrically connected by a metal conductive paste, and the metal in the metal conductive paste may be one or more of gold, silver, copper, tin, and nickel. The tantalum body 1 in this embodiment may be a tantalum body 1 of a conventional hard metal tantalum capacitor and a polymer tantalum capacitor.
According to the invention, the plastic package material is replaced by the metal shell 4 and the metal seat plate 3, so that water vapor can be better prevented from entering the product, and the high-temperature and high-humidity tolerance of the tantalum capacitor is improved.
Claims (9)
1. A tantalum capacitor, characterized by: the tantalum wire comprises a tantalum main body, a tantalum wire, a metal seat plate and a metal shell, wherein one end of the tantalum wire is arranged in the tantalum main body, and the other end of the tantalum wire extends out of the tantalum main body; the metal seat plate is used for sealing the tantalum main body and the tantalum wire in the shell, and an anode lead-out assembly and a cathode lead-out assembly are arranged on the metal seat plate; the anode lead-out assembly and the lead-out assembly respectively comprise an anode lead-out wire and a cathode lead-out wire; one end of the anode lead wire is electrically connected with the tantalum wire, the other end of the anode lead wire penetrates through the metal seat plate, and the anode lead wire and the metal seat plate are arranged in an insulating mode.
2. The tantalum capacitor of claim 1, wherein: the ceramic ring is arranged between the anode lead-out wire and the metal seat plate, and the ceramic ring is connected with the metal seat plate through brazing.
3. The tantalum capacitor of claim 2, wherein: the anode lead-out wire is connected with the ceramic ring through brazing.
4. The tantalum capacitor of claim 1, wherein: and an airtight structure is formed between the anode lead-out wire and the metal seat plate through calcining glass beads.
5. The tantalum capacitor of claim 1, wherein: an insulating gasket is arranged below the connection part of the tantalum wire and the anode lead-out wire.
6. A tantalum capacitor according to claim 1 wherein: the cathode lead-out wire is connected with the metal seat plate through brazing.
7. The tantalum capacitor of claim 1, wherein: the bottom of the metal seat plate is provided with an insulating base, and the anode outgoing line and the cathode outgoing line penetrate through the metal seat plate and the insulating seat plate and then are bent and attached to the bottom of the insulating seat plate.
8. The tantalum capacitor of claim 1, wherein: the cathode lead-out wire comprises a cathode shrapnel which is electrically connected with the tantalum main body.
9. The tantalum capacitor of claim 8, wherein: the cathode elastic sheet buckles the tantalum main body after bending.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311706400.XA CN117410102A (en) | 2023-12-13 | 2023-12-13 | Tantalum capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311706400.XA CN117410102A (en) | 2023-12-13 | 2023-12-13 | Tantalum capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117410102A true CN117410102A (en) | 2024-01-16 |
Family
ID=89494745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311706400.XA Pending CN117410102A (en) | 2023-12-13 | 2023-12-13 | Tantalum capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117410102A (en) |
-
2023
- 2023-12-13 CN CN202311706400.XA patent/CN117410102A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |