IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0916794
(2010-11-01)
|
등록번호 |
US-8259435
(2012-09-04)
|
발명자
/ 주소 |
- Millman, William A.
- Jackson, Ed
- Bates, James Steven
- Galvagni, John
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
187 |
초록
▼
A wet electrolytic capacitor that contains a hermetically sealed lid assembly is disclosed. More specifically, the lid assembly contains a lid (e.g., titanium) that defines an internal orifice. A conductive tube may extend through the orifice that is of a size and shape sufficient to accommodate an
A wet electrolytic capacitor that contains a hermetically sealed lid assembly is disclosed. More specifically, the lid assembly contains a lid (e.g., titanium) that defines an internal orifice. A conductive tube may extend through the orifice that is of a size and shape sufficient to accommodate an anode lead. An insulative material is also provided within the orifice to form a hermetic seal (e.g., glass-to-metal seal), such as between the conductive tube and the lid. The lid assembly also includes a liquid seal that is formed from a sealant material. The liquid seal coats a substantial portion of the lower surface of the lid and hermetic seal to limit contact with any electrolyte that may leak from the casing. To help achieve such surface coverage, the sealant material is generally flowable so that it can be heated during production of the capacitor and flow into small crevices that would otherwise remains uncoated.
대표청구항
▼
1. A wet electrolytic capacitor comprising: a casing that defines an opening and a sidewall surrounding an interior, wherein an electrochemically active cathode material is located on at least a portion of the sidewall;an anode positioned within the interior of the casing, wherein the anode is forme
1. A wet electrolytic capacitor comprising: a casing that defines an opening and a sidewall surrounding an interior, wherein an electrochemically active cathode material is located on at least a portion of the sidewall;an anode positioned within the interior of the casing, wherein the anode is formed from a porous anode body that contains a dielectric layer, the anode comprising an anode lead extending therefrom;an electrolyte that is in electrical contact with the anode and the electrochemically active material;a lid sealed to the casing opening that has an upper surface and lower surface, wherein the lower surface faces toward the interior of the casing, wherein the lid further defines an internal orifice;a hermetic seal positioned within the orifice of the lid, the hermetic seal having a lower surface that faces toward the interior of the casing; anda liquid seal that coats a substantial portion of the inner surface of the lid and the hermetic seal, wherein the liquid seal contains an insulative sealant material. 2. The wet electrolytic capacitor of claim 1, wherein the sealant material is flowable at a temperature of greater than about 250° C. 3. The wet electrolytic capacitor of claim 1, wherein the sealant material is flowable at a temperature of from about 285° C. to about 325° C. 4. The wet electrolytic capacitor of claim 1, wherein the sealant material includes a fluoropolymer. 5. The wet electrolytic capacitor of claim 4, wherein the fluoropolymer is poly(tetrafluoroethylene-co-perfluoroalkylvinyl ether). 6. The wet electrolytic capacitor of claim 1, wherein the liquid seal is a laminate that contains a sealant layer and a generally rigid layer, wherein the sealant layer contains the sealant material. 7. The wet electrolytic capacitor of claim 6, wherein the generally rigid layer becomes flowable at a temperature that is about 10° C. or more than the temperature at which the sealant layer becomes flowable. 8. The wet electrolytic capacitor of claim 6, wherein the sealant layer includes poly(tetrafluoroethylene-co-perfluoroalkyvinyl ether) and the generally rigid layer includes poly(tetrafluoroethylene). 9. The wet electrolytic capacitor of claim 1, wherein the sealant material includes a glass composition. 10. The wet electrolytic capacitor of claim 1, wherein the liquid seal covers about 90% or more of the lower surface of the lid and about 90% or more of the lower surface of the hermetic seal. 11. The wet electrolytic capacitor of claim 1, where a conductive tube is positioned within the orifice of the lid, wherein the anode lead extends through the conductive tube and the hermetic seal electrically insulates the conductive tube. 12. The wet electrolytic capacitor of claim 11, wherein the liquid seal covers at least a portion of the conductive tube. 13. The wet electrolytic capacitor of claim 11, wherein the conductive tube contains tantalum or an alloy thereof. 14. The wet electrolytic capacitor of claim 1, wherein both the lid and the casing contain titanium or an alloy thereof. 15. The wet electrolytic capacitor of claim 1, wherein both the lid and the casing have a generally cylindrical cross-sectional shape. 16. The wet electrolytic capacitor of claim 15, wherein the conductive polymer is poly(3,4-ethylenedioxythiophene). 17. The wet electrolytic capacitor of claim 1, wherein the electrochemically active cathode material includes a conductive polymer. 18. The wet electrolytic capacitor of claim 1, wherein the anode body includes tantalum, niobium, or an electrically conductive oxide thereof. 19. The wet electrolytic capacitor of claim 1, wherein the electrolyte is aqueous. 20. The wet electrolytic capacitor of claim 1, further comprising a separator that surrounds at least a portion of the anode. 21. The wet electrolytic capacitor of claim 1, further comprising a gasket that is located adjacent to an upper surface of the anode, the gasket being formed from an insulative material. 22. The wet electrolytic capacitor of claim 1, further comprising elastomeric rings positioned adjacent to the sidewall of the casing. 23. The wet electrolytic capacitor of claim 1, further comprising an external positive lead that is sealed to an end of the conductive tube and an external negative lead that is sealed to a lower wall of the casing. 24. A wet electrolytic capacitor comprising: a generally cylindrical metal casing that defines an opening and a sidewall surrounding an interior, wherein an electrochemically active cathode material is located on at least a portion of the sidewall;an anode positioned within the interior of the casing, wherein the anode is formed from a porous anode body that contains a dielectric layer, wherein the anode body includes tantalum, niobium, or an electrically conductive oxide thereof, the anode comprising an anode lead extending therefrom;a liquid electrolyte that is in electrical contact with the anode and the electrochemically active material;a generally cylindrical lid sealed to the casing opening that has an upper surface and lower surface, wherein the lower surface faces toward the interior of the casing, wherein the lid further defines an internal orifice;a conductive metal tube positioned within the orifice of the lid, wherein the anode lead extends through the conductive metal tube,a hermetic seal that is positioned within the orifice of the lid and electrically insulates the conductive tube, the hermetic seal having a lower surface that faces toward the interior of the casing; anda liquid seal that coats a substantial portion of the inner surface of the lid and the hermetic seal, wherein the liquid seal contains an insulative sealant material. 25. The wet electrolytic capacitor of claim 24, wherein the sealant material is flowable at a temperature of from about 285° C. to about 325° C. 26. The wet electrolytic capacitor of claim 24, wherein the sealant material includes a fluoropolymer. 27. The wet electrolytic capacitor of claim 25, wherein the fluoropolymer is poly(tetrafluoroethylene-co-perfluoroalkylvinyl ether). 28. The wet electrolytic capacitor of claim 24, wherein the liquid seal is a laminate that contains a sealant layer and a generally rigid layer, wherein the sealant layer contains the sealant material. 29. The wet electrolytic capacitor of claim 28, wherein the generally rigid layer becomes flowable at a temperature that is about 10° C. or more than the temperature at which the sealant layer becomes flowable. 30. The wet electrolytic capacitor of claim 29, wherein the sealant layer includes poly(tetrafluoroethylene-co-perfluoroalkyvinyl ether) and the generally rigid layer includes poly(tetrafluoroethylene). 31. The wet electrolytic capacitor of claim 24, wherein the sealant material includes a glass. 32. The wet electrolytic capacitor of claim 24, wherein the liquid seal covers about 90% or more of the lower surface of the lid and about 90% or more of the lower surface of the hermetic seal. 33. The wet electrolytic capacitor of claim 24, wherein the liquid seal covers at least a portion of the conductive tube. 34. The wet electrolytic capacitor of claim 24, wherein the electrochemically active cathode material includes a conductive polymer. 35. The wet electrolytic capacitor of claim 34, wherein the conductive polymer is poly(3,4-ethylenedioxythiophene). 36. The wet electrolytic capacitor of claim 24, further comprising: a gasket that is located adjacent to an upper surface of the anode, the gasket being formed from an insulative material; andelastomeric rings positioned adjacent to the sidewall of the casing.
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