Patent ID: 6639786
Filing Date: 2003-10-28
Classification: H01G,Y02E

Abstract:
A cylindrical electric double-layer capacitor comprising a cylindrical sealed vessel housing an electrode roll and an electrolyte solution, the electrode roll comprising a wrapped superposed assembly having a band-shaped positive pole, a band-shaped negative pole, and two band-shaped separators sandwiching one of the band-shaped positive and negative poles, wherein each of the band-shaped positive and negative poles includes a band-shaped collector and a pair of polarizing electrodes formed on opposite surfaces of the band-shaped collector,wherein an outer diameter D1 of the electrode roll before being housed in the sealed vessel and an inner diameter D2 of the sealed vessel are in a relationship of D12, and wherein, when the electrode roll is housed in the sealed vessel along with the electrolyte solution, the outer diameter D1 of the electrode roll and the inner diameter D2 of the sealed vessel are brought into a relationship of D1=D2 by at least one of swelling of the polarizing electrodes caused by the electrolyte solution and expansion of the polarizing electrodes caused by an electrical charge.