Electricity: electrical systems and devices – Electrolytic systems or devices – Liquid electrolytic capacitor
Reexamination Certificate
2006-02-28
2006-02-28
Thomas, Eric W. (Department: 2831)
Electricity: electrical systems and devices
Electrolytic systems or devices
Liquid electrolytic capacitor
C361S508000, C607S005000
Reexamination Certificate
active
07006347
ABSTRACT:
The present invention relates to electrolytic capacitors and, more particularly, to the reduction of water content within an electrolytic capacitor. Aluminum electrolytic capacitors tend to degrade with time. This is due, in part, to water in the electrolyte attacking the thin film of aluminum oxide (Al2O3) formed on the anode surface. Deformation of the aluminum oxide increases the leakage current of the capacitor, such that when one or more capacitors are used for shock delivery in an ICD, the first shock (after a hiatus) will have a significantly longer charge time. Unfortunately, one cannot remove all of the water from the electrolyte, as it is needed for conduction, as well as for the formation of the cut edges of the aluminum foil after assembly. According to the present invention, a desiccant material is used within an electrolytic capacitor casing to reduce the water content of a finished capacitor to below 1% by weight of the electrolyte. In a further embodiment, a moisture barrier layer is applied over the desiccant material, such that the desiccant material slowly absorbs moisture from the electrolyte, allowing for aging of the capacitor after assembly.
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Kroll Mark W.
Strange Thomas F.
Pacesetter Inc.
Thomas Eric W.
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