Power system for high temperature applications with rechargeable energy storage

A method of fabricating a power system for a logging instrument comprising:

• selecting a rechargeable energy storage that is operable in a temperature range of between about minus forty degrees Celsius and about two hundred and ten degrees Celsius coupled to a circuit for at least one of supplying power from the energy storage and charging the energy storage;
• wherein the rechargeable energy storage comprises an ultracapacitor comprising an electrochemical double-layer capacitor comprising:
• two electrodes wetted with an electrolyte, wherein at least one of the two electrodes comprise activated carbon, carbon fibers, rayon, graphene, aerogel, carbon cloth, carbon nanotubes and another nano-form of carbon;
• wherein the electrolyte comprises a plurality of cations and a plurality of anions, the cations comprising at least one of 1-(3-cyanopropyl)-3-methylimidazolium, 1,2-dimethyl-3-propylimidazolium, 1,3-bis(3-cyanopropyl)imidazolium, 1,3-diethoxyimidazolium, 1-butyl-1-methylpiperidinium, 1-butyl-2,3-dimethylimidazolium, 1-butyl-3-methylpyrolidinium, 1-butyl-4-methylpyridinium, 1-butylpyridinium, l-decyl-3-methylimidazolium, 1-ethyl-3-methylimidazolium and 3-methyl-1-propylpyridinium;
• the anions comprising at least one of bis(trifluoromethanesulfonate)imide, tris(trifluoromethanesulfonate)methide, dicyanamide, tetrafluoroborate, hexafluorophosphate, trifluoromethanesulfonate, bis(pentafluoroethanesulfonate)imide, thiocyanate, and trifluoro(trifluoromethyl)borate;
• and
• wherein the ultracapacitor exhibits a leakage current less than 1 amp per liter of volume over a range of operating temperatures and at a voltage up to a rated voltage;
• and
• a power supply;
• where the power supply is configured to supply energy from an energy storage to a logging instrument;
• a first subsystem controller;
• a first subsystem that is operative to provide a current draw for battery depassivation;
• where the first subsystem controller is configured to control the first subsystem;
• and
• an automatic bypass;
• where the automatic bypass determines a failed state for a component of the power system and reroutes power from the energy storage around the failed component;
• wherein the energy storage is configured to store between about a tenth of a joule and about one hundred kilojoules of energy, and to provide peak power of between about one watt and about one hundred kilowatts, for at least two charge-discharge cycles.