Patent ID: 10062919

Abstract:
A redox flow battery includes a battery unit, a positive electrode electrolyte tank, a negative electrode electrolyte tank, and a pressure adjustment mechanism. The battery unit includes a positive electrode, a negative electrode, and a membrane. The positive electrode electrolyte tank stores a positive electrode electrolyte to be supplied to the battery unit. The negative electrode electrolyte tank stores a negative electrode electrolyte to be supplied to the battery unit. The pressure adjustment mechanism is attached to at least one of the electrolyte tanks and adjusts the pressure of a gas phase inside the electrolyte tank. The pressure adjustment mechanism is provided with a water sealed valve which includes a storage container that stores a pressure adjusting liquid, a first exhaust tube that extends from the gas phase inside the electrolyte tank, extends through a gas phase inside the storage container, and is open to a liquid phase inside the storage container, and a second exhaust tube whose one end is open to the gas phase inside the storage container and whose other end is open to the atmosphere. The pressure adjusting liquid is a non-volatile liquid at normal temperature and normal pressure.