Fuel cell, electrochemical device, and method of tightening and adjusting fuel cell

An electrochemical device comprising:

• a cell stacked body including a plurality of electrochemical cells stacked one on another;
• a collecting plate located on the cell stacked body in a stacking direction of the electrochemical cells;
• an insulating plate located on the collecting plate;
• and
• a tightening structure located on the insulating plate and configured to hold the collecting plate and the insulating plate on the cell stacked body by being tightened toward the cell stacked body,
• wherein the tightening structure includes a first tightening plate including a planar portion in surface contact with the insulating plate, and a second tightening plate located on the first tightening plate and configured to press the first tightening plate against the insulating plate by being tightened toward the cell stacked body.

A method of tightening and adjusting a fuel cell comprising a cell staked body including a plurality of single unit fuel cells stacked one on another, a collecting plate located on the cell stacked body in a stacking direction of the single unit fuel cells;

• an insulating plate located on the collecting plate;
• and a tightening structure located on the insulating plate and configured to hold the collecting plate and the insulating plate on the cell stacked body by being tightened toward the cell stacked body, the method comprising:
• a step of detaching the tightening plate;
• a step of providing, on the insulating plate, an additional tightening plate including a planar portion to be in surface contact with the insulting plate;
• and
• a step of holding the collecting plate and the insulating plate on the cell stacked body by locating the tightening plate on the additional tightening plate, and by tightening the tightening plate toward the cell stacked body to press the additional tightening plate against the insulating plate.