| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery having an excellent cycle characteristic and high safety by changing quantity of the electrode material to be applied on a surface of each electrode sheet in the longitudinal direction thereof. SOLUTION: In a battery using an electrode body, which is formed by spirally winding a positive electrode sheet and a negative electrode sheet, coated quantity of the electrode material 2, 3, 4 on at least one surface of at least one electrode of the electrode sheets is changed in the longitudinal direction of the electrode sheet. Balance between the positive electrode and the negative electrode opposite to each other is maintained at the optimal condition in response to a curvature of the spiral by changing the coated quantity of the electrode material 2-5 from the center of the spiral to the periphery thereof. The electrode material is desirably coated so that the coated quantity of at least one outer peripheral surface becomes larger, as it comes closer to the center of an electrode body, and the coated quantity of at least one inner peripheral surface becomes smaller, as it comes closer to the center of the electride body. Coated quantity of the electrode material in the longitudinal direction of the sheet can be changed by coating the electrode material plural times. |
