| 摘要 |
An object of the present invention is to provide a high-quality secondary battery having high electric characteristics and high reliability, the secondary battery preventing a shortcut between a positive electrode and a negative electrode by means of an insulating material and preventing or reducing an increase in volume and deformation of a battery electrode assembly, and a method for manufacturing the same. Secondary battery 100 according to the present invention includes a battery electrode assembly including positive electrode 1 and negative electrode 6 alternately stacked via separator 20. Positive electrode 1 and negative electrode 2 each includes current collector 3 or 8 and active material 2 or 7 applied to current collector 3 or 8. Active material 2A positioned on one surface of positive electrode 1 of current collector 3 includes flat part 2A 1 and small-thickness part (thin-layer part) 2A 3 positioned on the end portion side relative to flat part 2A 1 , the small-thickness part 2A 3 having a thickness that is smaller than that of flat part 2A 1 . A part of active material 2B positioned on another surface of current collector 3 of positive electrode 1, the part facing thin-layer part 2A 3 of active material 2A positioned on the one surface via current collector 3 is a flat part having a constant thickness. |
