Fluted anode with minimal density gradients and capacitor comprising same
View Patent ↗An anode with an anode body with a first side and a second side opposite to said first side, multiple anode wires and a conductive polymer cathode.
1. A capacitor comprising:
an anode body with a first side and a second side opposite to said first side;
first flutes on said first side;
at least two anode wires extending from said anode body;
a dielectric coating on said anode body; and
a conductive polymer coating on said dielectric coating forming said capacitor.
2. The capacitor of claim 1 further comprising second flutes on said second side.
3. The capacitor of claim 2 wherein said first flutes and said second flutes are offset.
4. The capacitor of claim 2 wherein said first flutes each have a first flute wall and said second flutes each have a second flute wall wherein a cross-sectional area of said anode body between a planer projection of said first flute wall and a planer projection of said second flute wall is less than 50% of the total cross-sectional area of said anode body.
5. The capacitor of claim 2 wherein a depth of said first flute (TD) is related to a depth of said second flute (BD) by the equation:
TD≅BD *(1 −CR )
wherein CR is the compaction ratio percentage defined as the final compression height divided by the initial powder fill height.
6. The capacitor of claim 1 wherein said at least two anode wires has a cross-sectional aspect ratio of at least 2.0 to no more than 100.0.
7. The capacitor of claim 1 wherein said conductive polymer coating comprises a polymer selected from intrinsically conducting polymers and doped polymers.
8. The capacitor of claim 1 wherein said conductive polymer coating comprises a material, or derivative of a material, selected from polythiophene, polyethylenedioxythiophene, polyaniline and polypyrrole.
9. The capacitor of claim 1 wherein said conductive polymer coating comprises a material, or derivative of a material selected from polyethylenedioxythiophene, 7,7′,8,8′-tetracyanoquinonedimethane complex salt and polyaniline.
10. The capacitor of claim 1 wherein said anode body comprises at least one element, or alloy of an element selected from tantalum, aluminum, niobium, hafnium, zirconium and titanium.
11. The capacitor of claim 10 wherein said anode body comprises at least one element, or alloy of an element selected from niobium oxide, tantalum nitride and tantalum subnitride.
12. The capacitor of claim 1 with an ESR of less than 7 mOhms.
13. The capacitor of claim 12 with an ESR of less than 6 mOhms.
14. The capacitor of claim 13 with an ESR 2-6 mOhms.
15. A capacitor comprising:
an anode body with a first side and a second side opposite to said first side;
first flutes on said first side and second flutes on said second side; and
wherein said first flutes have a depth which is at least 50% more than a depth of said second flutes;
at least two anode leads extending from said anode body;
a dielectric coating on said anode body; and
a conductive polymer cathode on said dielectric coating.
16. The anode of claim 15 wherein said first flutes have a depth which is at least 100% more than a depth of said second flutes.
17. The anode of claim 15 wherein at least one anode lead of said at least two anode leads has an aspect ratio of at least 2.0 to no more than 100.0.
18. The capacitor of claim 15 further comprising a cathode lead frame.
19. The capacitor of claim 15 wherein said cathode lead frame is on said first side of said anode.
20. The capacitor of claim 15 wherein said cathode lead frame is on said second side of said anode.
21. The capacitor of claim 15 wherein said conductive polymer coating comprises a polymer selected from intrinsically conducting polymers.
22. The capacitor of claim 15 wherein said conductive polymer coating comprises a material, or derivative of a material selected from polythiophene, polyethylenedioxythiophene, polyaniline and polypyrrole.
23. The capacitor of claim 15 wherein said conductive polymer coating comprises a material, or derivative of a material selected from polyethylenedioxythiophene, 7,7′,8,8′-tetracyanoquinonedimethane complex salt and polyaniline.
24. The capacitor of claim 15 wherein said anode body comprises at least one element, or alloy of an element selected from tantalum, aluminum, niobium, hafnium, zirconium and titanium.
25. The capacitor of claim 24 wherein said anode body comprises at least one element, or alloy of an element selected from niobium oxide, tantalum nitride and tantalum subnitride.
26. The capacitor of claim 15 with an ESR of less than 7 mOhms.
27. The capacitor of claim 26 with an ESR of less than 6 mOhms.
28. The capacitor of claim 27 with an ESR 2-6 mOhms.
29. A capacitor comprising:
an anode body with a first side and a second side opposite to said first side;
first flutes on said first side; and
at least two anode wires extending from said anode wherein at least one anode wire of said at least two anode wires has a cross-sectional aspect ratio of at least 2.0 to no more than 100.0;
a dielectric coated on said anode body; and
a conductive polymer coated on said dielectric.
30. The capacitor of claim 29 wherein at least two anode wires have a cross-sectional aspect ratio of at least 2.0 to no more than 100.0.
31. The capacitor of claim 29 further comprising second flutes on a second side.
32. The capacitor of claim 31 wherein said first flutes have a depth which is at least 50% more than a depth of said second flutes.
33. The capacitor of claim 32 wherein said first flutes have a depth which is at least 100% more than a depth of said second flutes.
34. The capacitor of claim 33 wherein said first flutes have a depth which is at least 200% more than a depth of said second flutes.
35. The capacitor of claim 29 wherein said conductive polymer coating comprises a polymer selected from intrinsically conducting polymers.
36. The capacitor of claim 29 wherein said conductive polymer coating comprises a material, or derivative of a material selected from polythiophene, polyethylenedioxythiophene, polyaniline and polypyrrole.
37. The capacitor of claim 29 wherein said conductive polymer coating comprises a material, or derivative of a material selected from polyethylenedioxythiophene, 7,7′,8,8′-tetracyanoquinonedimethane complex salt and polyaniline.
38. The capacitor of claim 29 wherein said anode body comprises at least one element, or alloy of an element selected from tantalum, aluminum, niobium, hafnium, zirconium and titanium.
39. The capacitor of claim 38 wherein said anode body comprises at least one element, or alloy of an element selected from niobium oxide, tantalum nitride and tantalum subnitride.
40. The capacitor of claim 29 with an ESR of less than 7 mOhms.
41. The capacitor of claim 40 with an ESR of less than 6 mOhms.
42. The capacitor of claim 41 with an ESR 2-6 mOhms.