Patent ID: 7129001

Claim:
A method for producing a cell including a plurality of power-generating elements which are each in the form of an elliptic cylinder having a flat portion, wherein each of the plurality of power-generating elements includes a positive electrode and a negative electrode, said method comprising: forming each of the power-generating elements by winding the positive electrode and the negative electrode with a separator being interposed between the positive electrode and the negative electrode; superposing the flat portion of each of the plurality of power-generating elements on the flat portion of an adjacent one of the plurality of power-generating elements; placing a first sheet member on an outermost flat portion of one of the plurality of power-generating elements, and placing a second sheet member on an outermost flat portion of another one of the plurality of power-generating elements on which the one of the plurality of power-generating elements is superposed; pressing the first sheet member, the plurality of power-generating elements and the second sheet member; and joining the first sheet member to the second sheet member while the first sheet member, the plurality of power-generating elements and the second sheet member are pressed in said pressing.