Electrolysis system and method of use thereof

An electrolysis system comprising:

• an electrolyzer which comprises an electrode to generate a gas from the electrode, and
• a tightening device which controls a tightening load on the electrolyzer in accordance with a pressure of the gas,
• wherein the tightening device comprises an accumulator,
• the accumulator comprises a bladder,
• the tightening device is an oil pressure tightening device,
• the electrolyzer comprises at least one electrolytic cell, and two press plates disposed at both ends of the electrolyzer so as to sandwich the at least one electrolytic cell,
• one of the two press plates and the oil pressure tightening device are connected to each other,
• the electrolysis system further comprises a heat insulating member between at least the press plate connected to the oil pressure tightening device and the at least one electrolytic cell, among the at least one electrolytic cell and the two press plates, and
• the tightening load is controlled to maintain a tightening surface pressure of 0.5 MPa to 4.0 MPa.