| 摘要 |
PROBLEM TO BE SOLVED: To provide a new current collection structure suitable for a square secondary battery having a flat wound electrode body.SOLUTION: A square secondary battery has: a first region in which a current collector is connected to an outermost face of a wound positive electrode core body exposure part and is arranged in parallel to a sealing plate; a second region bent from an end of the first region and extending toward a bottom of a battery outer can; a third region arranged on the outermost face of the wound positive electrode core body exposure part; and a fourth region connecting the second region and the third region, inclined to the second region, and inclined to the third region. In the third region, the current collector is welded and connected to the outermost face of the wound positive electrode core body exposure part, and a notch is provided at an end on a center side of a flat wound electrode body at a boundary of the third region and the fourth region. |
