Method of producing lithium ion secondary battery

A method of producing a lithium ion secondary battery including a positive electrode plate provided with a positive electrode current collector which is constituted by a plate-shaped body having flexibility and has conductivity and a positive electrode active material which is formed on at least one surface of the positive electrode current collector in a layer shape, and a negative electrode plate provided with a negative electrode current collector which is constituted by a plate-shaped body having flexibility and has conductivity and a negative electrode active material which is formed on at least one surface of the negative electrode current collector in a layer shape, the positive electrode plate and the negative electrode plate being overlapped to face each other, the method comprising:

• a first winding process of winding the positive electrode plate in a roll shape to form a first roll and to provide a curling tendency to the positive electrode plate, and of winding the negative electrode plate separately from the positive electrode plate in a roll shape in the same direction as a winding direction of the first roll to form a second roll and to provide a curling tendency to the negative electrode plate;
• and
• a second winding process of unrolling the positive electrode plate from the first roll, unrolling the negative electrode plate from the second roll, and winding the unrolled positive electrode plate and negative electrode plate in a roll shape to form a third roll while allowing the positive electrode plate and the negative electrode plate to overlap with each other and maintaining the curling tendency.