Method for manufacturing rechargeable battery

A method for manufacturing a rechargeable battery, comprising:

• forming a mixture layer and an insulating layer adjacent to the mixture layer on a foil-shaped electrode substrate that includes an edge extending in a predetermined direction so that an exposed portion where the electrode substrate is exposed extends between the edge and the insulating layer on the electrode substrate;
• pressing the mixture layer;
• and
• stretching an extension portion, located between the edge and the mixture layer of the electrode substrate, and the insulating layer in the predetermined direction after the pressing;
• wherein the stretching includes applying:
• a stress that is less than a tensile strength of the electrode substrate and either:
• greater than or equal to a yield stress of the electrode substrate;
• or
• greater than or equal to a 0.2% proof stress of the electrode substrate to the extension portion, and
• a stress that is either:
• greater than or equal to a yield stress of the insulating layer;
• or
• greater than or equal to a 0.2% proof stress of the insulating layer to the insulating layer.