Wet Electrolytic Capacitor for Use at High Temperatures

摘要

A wet electrolytic capacitor that contains an anode formed from an anodically oxidized sintered porous body and a fluidic working electrolyte is provided. The casing contains a metal substrate coated an electrochemically-active material. Through a unique and controlled combination of features relating to the capacitor configuration and sealing assembly, the present inventor has discovered that good electrical properties (e.g., ESR stability) can be achieved at relatively high temperatures. One unique feature of the wet electrolytic capacitor that can help achieve such good ESR stability is the presence of a dielectric layer on the metal substrate of the cathode within a controlled thickness range. In other embodiments, a sealing assembly may be employed that contains a hermetic seal (e.g., glass-to-metal seal) and an elastomeric barrier seal formed from a high-temperature elastomeric material.

主权项

1. A wet electrolytic capacitor comprising:
a casing that defines an opening and a sidewall surrounding an interior, wherein the casing contains an anodically oxidized metal substrate having a dielectric layer with a thickness of from about 10 nanometers to about 500 nanometers, wherein the metal substrate is coated with an electrochemically active material; an anode positioned within the interior of the casing, wherein the anode is formed from an anodically oxidized sintered porous body, the anode comprising an anode lead extending therefrom; and a fluid working electrolyte that is in electrical contact with the anode and the electrochemically active material.