Patent ID: 6262879
Filing Date: 2001-07-17
Classification: H01G

Abstract:
An electrochemical device, comprising:a main body formed by rolling up an anode foil, a cathode foil and a separator disposed therebetween, each of the anode foil and the cathode foil having a lead wire connected thereto, wherein the main body is impregnated with an electrolytic solution;a tubular case having a bottom surface for accommodating the main body; anda seal for sealing an opening of the tubular case, which includes a through hole for the lead wire to pass therethrough, wherein:the electrolytic solution contains about 5 to about 100 parts by weight of a quaternary salt of a compound having an alkyl-substituted amidine group as an electrolyte with respect to 100 parts by weight of an organic solvent containing at least one of .gamma.-butyrolactone and propylene carbonate;the seal is an elastic body containing a butyl rubber polymer which is a copolymer of isobutylene, isoprene and divinylbenzene, and a peroxide as a vulcanizing agent; andat least a portion of the seal has a hardness of about 65 International Rubber Hardness Degrees.