| abstract |
The lithium ion secondary battery 10 includes a wound body 1, a positive electrode tab 2, a negative electrode tab 3, an exterior body 4, and a lid 5. The wound body 1 has a structure in which a positive electrode and a negative electrode are wound through a separator, and is housed in the exterior body 4. One end of the positive electrode tab 2 is connected to the positive electrode of the wound body 1, and the other end thereof is connected to the terminal 7 formed on the lid 5. And in order to make it possible to specify the production process line which manufactured the lithium ion secondary battery 10, one end of the negative electrode tab 3 is formed in the shape cut | disconnected at the cutting angle determined corresponding to the production process line. |