Patent ID: 7636232

Claim:
An electric double layer capacitor comprising: a cell including a positive electrode, a negative electrode facing said positive electrode, a porous separator that is impregnated with an electrolytic solution and that is disposed between said positive and negative electrodes, said positive and negative electrodes expanding upon charging of said electric double layer capacitor and contracting upon discharging of said electric double layer capacitor, and first and second electricity collecting plates which are respectively electrically connected to said positive and negative electrodes and extend beyond said positive and negative electrodes; and a porous electrolytic solution reservoir having a porous structure and in contact with said porous separator and impregnable with said electrolytic solution, wherein at least one of said first and second electricity collecting plates has a first region which is not in contact with a main surface of the respective electrode to which the electricity collecting plate is connected, and a second region which is in contact with the main surface of the respective electrode to which the corresponding electricity collecting plate is electrically connected, and said porous electrolytic solution reservoir is located facing said first region of said at least one of said first and second electricity collecting plates and is not sandwiched between the main surfaces of said positive and negative electrodes.