Energy storage device, method for manufacturing energy storage device, and energy storage apparatus

A method for manufacturing an energy storage device, the method comprising:

• housing, in a case, an electrode assembly obtained by winding a band-shaped positive electrode including a positive active material layer, a band-shaped negative electrode including a negative active material layer, and a band-shaped separator in a longitudinal direction, and an electrolyte solution;
• and
• pressing the case,
• wherein at least one of the positive active material layer and the negative active material layer contains a hollow active material particle,
• a winding axis of the electrode assembly is located parallel to a horizontal direction in the housing,
• at least a central part of the electrode assembly is pressed by the pressing, an excess electrolyte solution that is a part of the electrolyte solution is present between the electrode assembly and the case,
• a lower end of the electrode assembly has contact with the excess electrolyte solution, and
• at least one of formulas 1 to 3 below is satisfied, where H, Wc, Wa, and Ws respectively represent a height from a liquid level of the excess electrolyte solution to an upper end of the electrode assembly, a width of the positive active material layer, a width of the negative active material layer, and a width of the separator:
• 0.8H≤Wc≤2.0H 1
• 0.9H≤Wa≤2.1H 2
• 1.0H≤Ws≤2.2H 3.