Thermal pressure relief device (TPRD), gas pressure tank and gas pressure tank system comprising TPRD and method for thermal excess pressure protection

A gas pressure tank system for storing gaseous hydrogen, which is configured to supply a fuel cell system with gaseous hydrogen, comprising:

• at least one gas pressure tank comprising a connecting piece, and
• a thermal pressure relief device for the gas pressure tank system, wherein the thermal pressure relief device comprises:
• a valve unit which can be fluidically connected to the at least one gas pressure tank and which comprises at least one fluid path, by means of which a gas stored under pressure in the at least one gas pressure tank can be discharged into an environment,
• wherein the valve unit comprises a locking element which can be moved between an open position, in which the gas can flow through the fluid path, and a closed position, in which no gas can flow through the fluid path, and
• a first trigger means configured to move, due to heat impact, when reaching a predetermined temperature, the locking element into the open position and/or to enable the locking element to move into the open position,
• wherein the first trigger means is further configured
• to be able to detect heat impact at least at one location of the gas pressure tank system spatially separated from the installation location of the thermal pressure relief device, or
• to be able to detect heat impact at least at two spatially separated locations of the at least one gas pressure tank
• wherein the first trigger means is a test track which is under a predetermined pressure, so that the locking element, by application of this pressure, remains in the closed position until the pressure in the test track, due to the heat impact at the at least one location of the gas pressure tank system spatially separated from the installation location of the thermal pressure relief device, drops, or
• wherein the first trigger means is configured as a test track extending from the at least one location of the gas pressure tank system spatially separated from the installation location of the thermal pressure relief device to the thermal pressure relief device, the test track filled with a medium, the medium being a liquid or a gas, the pressure of which, due to heat impact, reaches a value when reaching the predetermined temperature, which is sufficient to move the locking element into the open position.