초록 ▼

An extended life capacitor is disclosed in which an enclosing body is made from a tantalum can and tantalum cap and enclosing a plurality of double layer capacitor cells. Each of the capacitor cells includes a conductive material, such as activated carbon, with an aqueous electrolyte therein such as

An extended life capacitor is disclosed in which an enclosing body is made from a tantalum can and tantalum cap and enclosing a plurality of double layer capacitor cells. Each of the capacitor cells includes a conductive material, such as activated carbon, with an aqueous electrolyte therein such as dilute sulfuric acid. In the preferred embodiment, this is about 38% by weight of sulfuric acid, and the remainder water. Lead-ins are provided to make electronic connection to the two ends of the capacitor cell stack as anode and cathode electrodes. The entire unit is hermetically sealed to inhibit the loss of electrolyte from the capacitor body to less than 2% per year, and the electrodes are at least partly coated with a noble metal such as gold to limit the establishment of a spurious capacitor which would be in series with the stack of plurality cells, which would otherwise greatly decrease the capacity of the entire unit.

대표청구항 ▼

An extended life capacitor comprising, in combination: an enclosing body having an interior surface formed from a material highly resistance to corrosion by the electrolyte of the capacitor; a plurality of double layer capacitor cells inside said enclosing body and having first and second electron-c

An extended life capacitor comprising, in combination: an enclosing body having an interior surface formed from a material highly resistance to corrosion by the electrolyte of the capacitor; a plurality of double layer capacitor cells inside said enclosing body and having first and second electron-conducting end members; said plurality of capacitor cells including a high surface area carbon material impregnated with an electrolyte; means providing electrical connection external to said body, mutually insulated, to said first and second end members of said plurality of capacitor cells as anode and cathode; means to inhibit the loss of electrolyte from the interior to the exterior of said capacitor body; and said inhibiting means including an hermetically sealed body and high purity components.