Method of evaluating power storage device, method of manufacturing power storage device, and test system

A method of evaluating a power storage device comprising at least:

• preparing a power storage device, the power storage device including at least a housing and an electrode assembly, the electrode assembly being accommodated in the housing, the electrode assembly including a positive electrode and a negative electrode, at least one positive electrode and at least one negative electrode being alternately stacked to form a stack portion in the electrode assembly;
• adjusting a charge level of the power storage device to produce a first potential difference between the positive electrode and the negative electrode;
• selecting the positive electrode or the negative electrode as a reference electrode;
• performing an operation to insert a conductive rod-shaped member into the stack portion along a direction of stack of the positive electrode and the negative electrode while a second potential difference between the reference electrode and the rod-shaped member is measured after the charge level is adjusted;
• stopping the rod-shaped member;
• and
• evaluating the power storage device based on a state of the power storage device after the rod-shaped member is stopped,
• when an electrode with which the rod-shaped member comes in contact first in the stack portion is different from the reference electrode, the operation to insert the rod-shaped member being controlled to stop the rod-shaped member when decrease in absolute value of the second potential difference is detected at least once, and
• when the electrode with which the rod-shaped member comes in contact first in the stack portion is identical to the reference electrode, the operation to insert the rod-shaped member being controlled to stop the rod-shaped member when increase in the absolute value of the second potential difference is detected at least once.