Lithium-ion secondary battery

The present invention provides a production process capable of determining the production line of lithium ion secondary battery. The lithium ion secondary battery (10) includes a winding body (1), the positive electrode tab (2), the negative electrode tab (3), the positive electrode canister (4) and the cover (5). Wound body (1) having a separator interposed therebetween to positive and negative electrodes wound structure, and is stored in (4) an exterior thereof. Positive electrode tab (2) one end of the wound body (1) is connected to the positive electrode, the other end of the lid member (5) is connected. A negative terminal connected to the negative electrode tab (3) one end of the wound body (1) and the other end provided to the cover (5) (7) is connected. Further, one end of the negative electrode tab (3) having a production process lines and lithium ion secondary battery (10) corresponding to the determined cutting angle is cut shape.