Patent ID: 6906911

Claim:
An electric double layer capacitor having contained in a casing an electrolyte, a positive electrode and a negative electrode each being an electrode containing carbon black, to form an electric double layer at the interface with the electrolyte, and a separator interposed between the positive electrode and the negative electrode, wherein at least one electrode of the positive electrode and the negative electrode has protruded portions or bent portions formed continuously in the height direction against the bottom face of the casing, and a space due to the height of the protruded portions or the bent portions is formed between said at least one electrode and the separator, wherein a plurality of such positive electrodes and negative electrodes are alternately stacked with the separator between them, or the positive electrode and the negative electrode each having a long strip shape, are wound with the separator between them, and contained in the casing having a bottomed cylindrical or rectangular shape.