Electrode sheet, battery incorporating the electrode sheet, method for manufacturing the electrode sheet, method for manufacturing the battery incorporating the electrode sheet, and die head

A strip-shaped electrode sheet comprising:

• a strip-shaped electrode foil extending in a longitudinal direction, the electrode foil including a one-side foil edge on one side in a width direction of the electrode foil and a strip-shaped foil exposed portion extending along the one-side foil edge in the longitudinal direction, in which the electrode foil is exposed;
• a strip-shaped active material layer extending in the longitudinal direction, the active material layer being formed on an active-material-layer support portion of the electrode foil on an other side in the width direction relative to the foil exposed portion;
• and
• a strip-shaped insulator layer extending in the longitudinal direction and containing insulating resin, the insulator layer being formed along a one-side layer edge portion of the active material layer located on the one side in the width direction and on an insulator-layer support portion of the electrode foil located between the foil exposed portion and the active-material-layer support portion,
• wherein the one-side layer edge portion of the active material layer includes a one-side slant portion in which the active material layer has a thinner thickness as closer to the one side in the width direction,
• the insulator layer is located lower than a top face of the active material layer toward the electrode foil, and
• the insulator layer includes:
• a slant coating portion that covers at least a lower portion of the one-side slant portion of the active material layer;
• and
• a foil coating portion that extends from the slant coating portion toward the one side in the width direction to cover the insulator-layer support portion of the electrode foil;
• wherein the slant coating portion of the insulator layer has a thickness at the center in the width direction, that is thicker than a thickness of the foil coating portion at the center in the width direction.