Patent ID: 8105711

Claim:
A nonaqueous electrolyte secondary battery comprising: a positive electrode which includes a positive electrode current collector and a positive electrode mixture layer provided on surfaces of the positive electrode current collector and containing a positive electrode active material, and to which one end of a positive electrode lead is attached, and; a negative electrode which includes a negative electrode current collector and a negative electrode mixture layer provided on surfaces of the negative electrode current collector and containing a negative electrode active material, and to which one end of a negative electrode lead is attached; a separator provided between the positive electrode and the negative electrode; and a battery case in which an electrode plate group including the positive electrode and the negative electrode spirally wound or stacked with the separator interposed therebetween is stored with an electrolyte, wherein a positive electrode sealing plate which is electrically insulated from the battery case and serves also as a positive electrode terminal is arranged on one opening edge portion of the battery case, a negative electrode sealing plate which is electrically insulated from the battery case and serves also as a negative electrode terminal is arranged on the other opening edge portion of the battery case, the other end of the positive electrode lead is connected to the positive electrode sealing plate, the other end of the negative electrode lead is connected to the negative electrode sealing plate, and after charging, when the separator is removed to bring a surface of the positive electrode mixture layer and a surface of the negative electrode mixture layer in contact with each other, terminals are respectively provided on the positive electrode current collector and the negative electrode current collector, and a resistance value between the terminals is measured, the resistance value is 1.6 Ω·cm 2 or more, and the battery case is electrically insulated from the positive electrode and the negative electrode.