System for regulating pressure in liquid hydrogen fuel tank for a fuel cell electric vehicle

A pressure control device for a liquid hydrogen tank for a hydrogen fuel cell vehicle comprising a fuel cell, a battery, and a drive motor, wherein

• the liquid hydrogen tank comprises a vacuum chamber, an inner chamber located in the vacuum chamber and storing liquid hydrogen therein, and a multi-layered insulation (MLI) surrounding the inner chamber, and
• the pressure control device comprises:
• a liquid hydrogen pump located in a liquid hydrogen section of the inner chamber;
• an expansion valve located downstream of the liquid hydrogen pump;
• a heat exchanger located downstream of the expansion valve;
• a first flow path through which liquid hydrogen supplied from the liquid hydrogen pump passes through the heat exchanger and is sprayed into a gaseous hydrogen section of the inner chamber;
• a second flow path through which the liquid hydrogen supplied from the liquid hydrogen pump sequentially passes through the expansion valve and the heat exchanger and flows;
• a turbine;
• an auxiliary generator driven by the turbine to supply electrical energy to the battery;
• and
• a third flow path that contacts and surrounds the multi-layered insulation and allows fluid flowing out of the turbine to flow toward the fuel cell,
• wherein the second flow path is connected to the third flow path in such a way that the second flow path branches off from the third flow path.