Method for manufacturing bipolar battery

A method for manufacturing a bipolar secondary battery in which a plurality of cells each including a positive electrode, a negative electrode, and an electrolyte layer are stacked, the method comprising:

• an initial charging step of charging, to a specified voltage, a first cell group including a plurality of cells arranged at every other tier in a stacking direction, and a second cell group including a plurality of cells arranged next to the respective cells included in the first cell group;
• a high-temperature aging step of performing aging at a high temperature higher than room temperature;
• and
• an under-aging charging step of alternately charging the first cell group and the second cell group in the high-temperature aging step until the first cell group and the second cell group reach the specified voltage, wherein
• in the under-aging charging step, a charging completion condition for at least one of the first cell group and the second cell group is determined based on a dissolution rate calculated based on a type of a metal foreign substance and a positive electrode potential, and a voltage and an aging time of each of the cells in the under-aging charging step.