| 摘要 |
PROBLEM TO BE SOLVED: To improve productivity and electrical characteristics by storing a plurality of roll-shaped electrode groups constituted with a positive electrode, a separator, and a negative electrode in a vessel. SOLUTION: Five electrode groups 1, each of which is formed by winding a layered body of a positive electrode, a separator, and a negative electrode in a roll shape, are arranged in line in a vessel 4 and are interconnected in parallel. The vessel 4 stores the electrode groups 1 and a power-generating element constituted with an electrolyte. The electrode groups 1 are circular or elliptic, and the diameter of the circle or the shorter diameter of the ellipse is 2-6 mm for example. Thus, a very thin battery with about 2.5 mm width can be realized. Thus, when the plurality of roll-shaped electrode groups 1 are arranged transversely on a plane, a dead space among adjacent electrode groups having the elliptic shape is smaller than that for the circular shape, and therefore, volume efficiency of the battery can be advantageously increased. |
