Patent ID: 7768770

Claim:
An electric double layer capacitor including a positive electrode and a negative electrode in each of which polarized electrode layers are formed on both surfaces of a current collector plate, a positive electrode lead wire and a negative electrode lead wire respectively connected to the positive and negative electrodes, a separator interposed between the positive and negative electrodes, and an electrolyte soaked into the separator, wherein a surface region of the electrode to which the lead wire is to be joined and a surface region which is opposite thereto are respectively free from the polarized electrode layers, and each lead wire is joined to the current collector plate by means of stitching and then compressed thereto, and wherein a location (L) of each lead wire, defined by the following equation, is equal to or greater than 0.1 but smaller than 1: L = d 2 ⁢ π ⁢ ⁢ A V where d is a distance from a central axis of the capacitor to the positive or negative electrode lead wire, V is a sum of volumes of the positive electrode, the negative electrode and the separator, and A is a height of the capacitor.