| abstract |
An ultracapacitor (10) comprises at least one cell comprising two solid, nonporous current collectors (22, 24), two porous electrodes (14, 16) separating the current collectors (22, 24), a porous separator (18) between the electrodes (14, 16) and an electrolyte (20) occupying pores in the electrodes (14, 16) and separator (18). The cell is sealed with a reclosable hermetic closure (120). |