Electrochemical device and method of manufacturing electrochemical device

摘要

An electrochemical device 2 comprises electrode bodies 4a, 4b each having positive and negative electrodes laminated with a separator interposed therebetween; an outer package 8 accommodating a multilayer body 6 composed of the electrode bodies 4a, 4b; leads 10 respectively connected to the positive and negative electrodes while extending from the multilayer body 6 to the outside of the outer package 8; and a sealing member 12 in close contact with surroundings of the leads 10 and held by an opening part 14 of the outer package 8 so as to seal the opening part 14. The electrode bodies 4a, 4b are laminated such as to yield portions where different numbers of the leads overlap each other in the laminating direction of the electrode bodies in the opening part 14. The electrochemical device 2 has a portion where a thickness of the sealing member 12 from a surface of the outer package 8 to a surface of the lead 10 in the laminating direction of the electrode bodies on one side of the lead 10 differs from that on the other side of the lead 10 such that the two leads 10 connected to each electrode body are arranged within the same plane perpendicular to the laminating direction of the electrode bodies.