Energy storage device and method of manufacturing energy storage device

An energy storage device, comprising:

• an electrode assembly formed by winding electrodes and a separator in a layered state;
• a case for storing the electrode assembly therein, the case comprising an electrolyte solution sealing portion where an electrolyte solution pouring hole formed in the case is sealed;
• a first guide portion which is arranged in an inside of the case and allows an electrolyte solution to flow toward one end of the electrode assembly in a winding axis direction from the electrolyte solution pouring hole;
• and
• a second guide portion which is arranged in the inside of the case and allows a fluid to flow toward the electrolyte solution pouring hole from the inside of the case, and which prevents the electrolyte solution from flowing toward an other end of the electrode assembly in the winding axis direction from the electrolyte solution pouring hole or suppresses the electrolyte solution from flowing toward the other end of the electrode assembly in the winding axis direction from the electrolyte solution pouring hole,
• wherein the case includes a wall which is substantially parallel to the winding axis direction, the electrolyte solution pouring hole is formed on the wall, and the first guide portion and the second guide portion are arranged between the wall and the electrode assembly,
• wherein the first guide portion comprises a first flow control portion that pivots away from the wall to pass the electrolyte solution through the first guide portion, and
• wherein the second guide portion comprises a second flow control portion that, in a same direction that the first flow control portion pivots away from the wall, pivots away from the wall to pass the fluid through the second guide portion.

A method of manufacturing an energy storage device which includes an electrode assembly formed by winding electrodes and a separator in a layered state, and a case for storing the electrode assembly therein, the case comprising an electrolyte solution sealing portion where an electrolyte solution pouring hole formed in the case is sealed, wherein the method comprises:

• pouring an electrolyte solution in the case through the electrolyte solution pouring hole which is in a non-sealed state, the case being provided with:
• a first guide portion which is arranged in an inside of the case and allows an electrolyte solution to flow toward one end of the electrode assembly in a winding axis direction from the electrolyte solution pouring hole;
• and
• a second guide portion which is arranged in the inside of the case and allows a fluid to flow toward the electrolyte solution pouring hole from the inside of the case, and which prevents the electrolyte solution from flowing toward an other end of the electrode assembly in the winding axis direction from the electrolyte solution pouring hole or suppresses the electrolyte solution from flow toward the other end of the electrode assembly in the winding axis direction from the electrolyte solution pouring hole,
• wherein the case includes a wall which is substantially parallel to the winding axis direction, the electrolyte solution pouring hole is formed on the wall, and the first guide portion and the second guide portion are arranged between the wall and the electrode assembly, and
• wherein, between the wall and the electrode assembly, the electrolyte solution flows through the first guide portion in a same direction as a direction that the fluid flows through the second guide portion.