| 摘要 |
PROBLEM TO BE SOLVED: To provide a power storage device increasing kinds of usable electrode mixtures, preventing addition of unnecessary stress to a metallic sheet by heating processing, and equipped with an electrode body using a sheet-shaped electrode which does not require stress relaxation.SOLUTION: A power storage device has an electrode body 12 in which a positive pole sheet 18, and a negative pole sheet 19 are laminated while a separator 20 put between them. The positive pole sheet and the negative pole sheet have metallic sheets; a positive pole active material layer 18a or a negative pole active material layer 19a formed by applying an electrode mixture on at least one side surfaces of the metallic sheets; and active material unapplied portions 18b and 19b formed while having width along at least one side of the metallic sheets, and in which the electrode mixture is not applied on both surfaces of the metallic sheets. On the active material unapplied portion, at least one line of a plurality of recessed portions 21 having shaped closed at edge portions is formed at a part on a boundary side with the positive pole active material layer or the negative pole active material layer and in an extending direction of a boundary with an electrode mixture layer. |
