Roll press apparatus and method for producing compressed strip-shaped electrode sheet

A method for producing a compressed strip-shaped electrode sheet, the compressed strip-shaped electrode sheet including:

• a strip-shaped current collecting foil;
• and a compressed active material layer compressed in a thickness direction of the current collecting foil,
• wherein the compressed strip-shaped electrode sheet is formed of a strip-shaped electrode sheet,
• the strip-shaped electrode sheet including the current collecting foil and a strip-shaped active material layer located on the current collecting foil and extended in a longitudinal direction of the current collecting foil to provide:
• a strip-shaped active material portion extended in the longitudinal direction and including the active material layer in the thickness direction of the current collecting foil;
• and
• a strip-shaped active-material absent portion extended in the longitudinal direction and arranged adjacent to the active material portion in a width direction of the current collecting foil, wherein the active-material absent portion does not include the active material layer in the thickness direction and has a thinner thickness than the active material portion;
• and
• wherein the method includes:
• active-material-absent-portion stretching of stretching the active-material absent portion of the strip-shaped electrode sheet in the longitudinal direction of the current collecting foil;
• and
• pressing of roll-pressing the strip-shaped electrode sheet being conveyed after the active-material-absent-portion stretching to compress the active material layer to form the compressed strip-shaped electrode sheet including the compressed active material layer.