Electric double layer capacitor, electrolytic cell and process for fabricating same

A process for fabricating an electric double layer capacitor including the steps of:

• making a first container half segment in the form of a box by insert molding, the first container segment having a platelike first lead member disposed on a bottom wall of a first recessed portion thereof, the first lead member having a portion closer to one end thereof and embedded in the first container segment, the first lead member portion being bent as embedded in the first container segment and having an outer end positioned on substantially the same plane as a bottom outer surface of the first container segment,
• making a second container half segment in the form of a box by insert molding, the second container segment having a platelike second lead member disposed on a bottom wall of a second recessed portion thereof, the second lead member having a portion closer to one end thereof and embedded in the second container segment, the second lead member portion being bent as embedded in the second container segment and extending along an extension of the second container segment formed at one end thereof, the second lead member portion having an outer end projecting outward from an outer side surface of the extension and positioned on substantially the same plane as an end face of the extension,
• joining a first polarizable electrode to the first lead member directly or with a first current collecting member interposed therebetween and impregnating the first electrode with an electrolyte,
• joining a second polarizable electrode to the second lead member directly or with a second current collecting member interposed therebetween and impregnating the second electrode with the electrolyte, and
• making a substantially rectangular parallelepipedal container by joining the first container segment and the second container segment in combination so that the end face of the extension is positioned on substantially the same plane as the bottom outer surface of the first container segment.

An electrolytic cell comprising a container made from a resin in a substantially rectangular parallelepipedal form by joining a first container half segment and a second container half segment each in the form of a box,

• the container having housed therein a positive electrode and a negative electrode impregnated with an electrolyte,
• the second container segment being provided at one end thereof with an extension extending along an outer side surface of the first container segment to a bottom outer surface thereof,
• the extension having an end face in a common plane with the bottom outer surface of the first container segment,
• a platelike first lead member being provided on a bottom wall of a recessed portion of the first container segment, the first lead member being electrically connected to one of the positive electrode and the negative electrode,
• a platelike second lead member being provided on a bottom wall of a recessed portion of the second container segment, the second lead member being electrically connected to the other electrode,
• the first lead member having a portion closer to one end thereof and embedded in the first container segment, the first lead member portion being bent as embedded in the first container segment and being led out of the container to outside thereof,
• the second lead member having a portion closer to one end thereof and embedded in the second container segment, the second lead member portion being bent as embedded in the second container segment and extending through the extension to outside of the container, and
• the first lead member portion and the second lead member portion having respective outer ends projecting outward from the container and arranged on substantially the same plane as an outer lower surface of the container.

A process for fabricating an electrolytic cell including the steps of:

• making a first container half segment in the form of a box by insert molding, the first container segment having a platelike first lead member disposed on a bottom wall of a first recessed portion thereof, the first lead member having a portion closer to one end thereof and embedded in the first container segment, the first lead member portion being bent as embedded in the first container segment and having an outer end positioned on substantially the same plane as a bottom outer surface of the first container segment,
• making a second container half segment in the form of a box by insert molding, the second container segment having a platelike second lead member disposed on a bottom wall of a second recessed portion thereof, the second lead member having a portion closer to one end thereof and embedded in the second container segment, the second lead member portion being bent as embedded in the second container segment and extending along an extension of the second container segment formed at one end thereof, the second lead member portion having an outer end projecting outward from an outer side surface of the extension and positioned on substantially the same plane as an end face of the extension,
• joining one of a positive electrode and a negative electrode to the first lead member directly or with a first current collecting member interposed therebetween and impregnating said first polarizable electrode with an electrolyte,
• joining the other electrode to the second lead member directly or with a second current collecting member interposed therebetween and impregnating said other electrode with the electrolyte, and
• making a substantially rectangular parallelepipedal container by joining the first container segment and the second container segment in combination so that the end face of the extension is positioned on substantially the same plane as the bottom outer surface of the first container segment.