| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylindrical secondary battery improved in current collecting and excellent in discharging performance. SOLUTION: The cylindrical secondary battery includes a spiral electrode plate, in which a positive electrode having a positive electrode active material and a positive current collection electrode, and a negative electrode having a negative electrode active material and a negative current collection electrode, are wound intervening a separator therebetween. At least one side of the collection electrodes has plural electrode plate ears and gaps all formed on the collection electrodes. Also, the porosity of a winding end of the collection electrodes is smaller than that of a winding start. |
