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A single cell, multi-electrode high performance double layer capacitor includes first and second flat stacks of electrodes adapted to be housed in a closeable two-part capacitor case which includes only a single electrolyte seal. Each electrode stack has a plurality of electrodes connected in parall

A single cell, multi-electrode high performance double layer capacitor includes first and second flat stacks of electrodes adapted to be housed in a closeable two-part capacitor case which includes only a single electrolyte seal. Each electrode stack has a plurality of electrodes connected in parallel, with the electrodes of one stack being interleaved with the electrodes of the other stack to form an interleaved stack, and with the electrodes of each stack being electrically connected to respective capacitor terminals. A porous separator sleeve is inserted over the electrodes of one stack before interleaving to prevent electrical shorts between the electrodes. The electrodes are made by folding a compressible, low resistance, aluminum-impregnated carbon cloth, made from activated carbon fibers, around a current collector foil, with a tab of the foils of each electrode of each stack being connected in parallel and connected to the respective capacitor terminal. The height of the interleaved stack is somewhat greater than the inside height of the closed capacitor case, thereby requiring compression of the interleaved electrode stack when placed inside of the case, and thereby maintaining the interleaved electrode stack under modest constant pressure. The closed capacitor case is filled with an electrolytic solution and sealed. A preferred electrolytic solution is made by dissolving an appropriate salt into acetonitrile (CH.sub.3 CN). In one embodiment, the two parts of the capacitor case are conductive and function as the capacitor terminals.

대표청구항 ▼

[ What is claimed is:] [1.] A double layer capacitor comprising:a capacitor case comprising a first part and a second part fastenable to each other to form a sealed capacitor case, the first part having a first capacitor terminal associated therewith, and the second part having a second capacitor te

[ What is claimed is:] [1.] A double layer capacitor comprising:a capacitor case comprising a first part and a second part fastenable to each other to form a sealed capacitor case, the first part having a first capacitor terminal associated therewith, and the second part having a second capacitor terminal associated therewith;a first electrode stack comprising a plurality of electrodes, each electrode of the first electrode stack comprising a current collector foil and a compressible carbon cloth impregnated with aluminum in direct physical contact with the current collector foil, and wherein the current collector foil of each electrode is bonded to the first capacitor terminal, whereby the electrodes of the first stack are all connected in parallel to the first capacitor terminal via their respective current collector foils;a second electrode stack comprising a plurality of electrodes, each electrode of the second electrode stack comprising a current collector foil and a compressible carbon cloth impregnated with aluminum in direct physical contact with the current collector foil, and wherein the current collector foil of each electrode is bonded to the second capacitor terminal, whereby the electrodes of the second electrode stack are all connected in parallel to the second capacitor terminal via their respective current collector foils;a porous separator sleeve placed around each of the electrodes of the second stack, the separator sleeve having pores therein through which ions may readily pass;the electrodes of the first and second stacks being interleaved with each other to form an interleaved flat electrode stack in which adjacent electrodes are prevented from electrically contacting each other by the porous separator sleeve;the interleaved flat electrode stack being maintained under a constant modest pressure within the sealed capacitor case; anda prescribed electrolytic solution sealed within the sealed capacitor case, whereby the interleaved flat electrode stack is saturated and immersed within the electrolytic solution.