A wet electrolytic capacitor that contains a casing that contains a sidewall extending to an upper end to define an opening is provided. The sidewall further defines an inner surface that surrounds an interior. At least one anode and at least one cathode are positioned within the interior of the cas
A wet electrolytic capacitor that contains a casing that contains a sidewall extending to an upper end to define an opening is provided. The sidewall further defines an inner surface that surrounds an interior. At least one anode and at least one cathode are positioned within the interior of the casing, wherein the cathode contains an electrochemically-active material and further wherein an anode lead extends from the anode. A working electrolyte is in electrical contact with the anode and the electrochemically-active material. The capacitor also comprises a lid assembly that contains a lid positioned on an upper end of the casing sidewall, wherein the lid defines an orifice through which a tube extends. The tube accommodates the anode lead that extends from the anode. A dielectric layer is formed on a surface of the tube.
대표청구항▼
1. A wet electrolytic capacitor comprising: a casing that contains a sidewall extending to an upper end to define an opening, wherein the sidewall further defines an inner surface that surrounds an interior;at least one anode and at least one cathode positioned within the interior of the casing, whe
1. A wet electrolytic capacitor comprising: a casing that contains a sidewall extending to an upper end to define an opening, wherein the sidewall further defines an inner surface that surrounds an interior;at least one anode and at least one cathode positioned within the interior of the casing, wherein the cathode contains an electrochemically-active material and further wherein an anode lead extends from the anode;a working electrolyte that is in electrical contact with the anode and the electrochemically-active material;a lid assembly that contains a lid positioned on an upper end of the casing sidewall, wherein the lid defines an orifice through which a tube extends, wherein the tube accommodates the anode lead that extends from the anode, and further wherein a dielectric layer is formed on a surface of the tube. 2. The wet electrolytic capacitor of claim 1, wherein the dielectric layer is formed on an inner surface of the tube, a lower surface of the tube, or both. 3. The wet electrolytic capacitor of claim 1, wherein the dielectric layer has a thickness of from about 30 to about 500 nanometers. 4. The wet electrolytic capacitor of claim 1, wherein the anode contains a sintered porous body on which a dielectric layer is formed. 5. The wet electrolytic capacitor of claim 1, wherein the tube is formed from a valve metal. 6. The wet electrolytic capacitor of claim 5, wherein the valve metal is tantalum. 7. The wet electrolytic capacitor of claim 1, wherein the anode includes tantalum. 8. The wet electrolytic capacitor of claim 1, wherein the sidewall has a cylindrical shape. 9. The wet electrolytic capacitor of claim 1, wherein the electrochemically-active material includes a conductive polymer. 10. The wet electrolytic capacitor of claim 1, wherein the electrochemically-active material includes sintered tantalum particles. 11. The wet electrolytic capacitor of claim 1, wherein the electrochemically-active material is coated onto a metal substrate. 12. The wet electrolytic capacitor of claim 11, wherein the metal substrate is formed from tantalum. 13. The wet electrolytic capacitor of claim 1, wherein the cathode is disposed in proximity to an inner surface of the casing sidewall. 14. The wet electrolytic capacitor of claim 1, wherein the electrolyte is aqueous and has a pH of from about 4.5 to about 8.0. 15. The wet electrolytic capacitor of claim 1, wherein the capacitor contains multiple anodes positioned within the interior of the casing. 16. The wet electrolytic capacitor of claim 15, wherein the capacitor contains first and second outer anodes positioned within the interior of the casing and a central anode positioned within the interior of the casing between the first and second outer anodes. 17. The wet electrolytic capacitor of claim 16, wherein an anode lead extends from the central anode, the first outer anode, and the second outer anode, respectively. 18. The wet electrolytic capacitor of claim 17, wherein the anode lead extending from the first outer anode is folded to contact the anode lead extending from the central anode and the anode lead extending from the second outer anode. 19. The wet electrolytic capacitor of claim 16, wherein a first cathode is disposed in proximity to an inner surface of the casing sidewall. 20. The wet electrolytic capacitor of claim 19, wherein a second cathode is disposed between the first outer anode and the central anode and a third cathode is disposed between the second outer anode and the central anode. 21. The wet electrolytic capacitor of claim 1, further comprising an external positive lead that is sealed at an end of the tube and an external negative lead that is sealed to the casing. 22. The wet electrolytic capacitor of claim 1, wherein an insulative material is provided within the orifice to form a hermetic seal between the tube and a sidewall of the orifice. 23. The wet electrolytic capacitor of claim 1, further comprising a liquid seal that covers at least a portion of the tube. 24. The wet electrolytic capacitor of claim 1, further comprising a gasket that is positioned adjacent to an upper surface of the anode. 25. The wet electrolytic capacitor of claim 24, further comprising an elastomeric washer that is positioned adjacent to the gasket.
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