Temperature pressure relief device

A temperature pressure relief device comprising:

• a body including an inlet passage into which gas is introduced, an interior passage extending from the inlet passage in a predetermined first direction, and a gas exhaust passage formed between the inlet passage and a reference end that is a distal end of the interior passage in the first direction, the gas exhaust passage being configured to connect the interior passage to an outside of the body;
• a blocking part disposed in the interior passage of the body and selectively placed in one of a blocking state in which the interior passage and the gas exhaust passage are disconnected from each other so as not to allow for a release of the gas or a connecting state in which the interior passage and the gas exhaust passage are connected to each other to allow for the release of the gas;
• and
• a support part arranged between the blocking part and the reference end, wherein the support part is maintained in a solid state at a reference temperature or less and is in a molten state at more than the reference temperature and discharged from the interior passage,
• wherein the blocking part is placed in the blocking state by being supported by the support part when the support part is in the solid state, and the blocking part is placed in the connecting state after at least a portion of the support part is discharged from the interior passage when the support part is in the molten state,
• wherein the blocking part includes:
• a first stem disposed in the interior passage so as to be movable between a first position where the first stem does not allow for the release of the gas and a second position where the first stem allows for the release of the gas;
• and
• a second stem arranged between the first stem and the support part and disposed in the interior passage so as to be movable in the first direction when the support part is in the molten state,
• wherein the first stem has an inlet connected with the inlet passage, an outlet configured to be open toward the second stem, and a connecting passage formed in the first stem to connect the inlet to the outlet, and
• wherein the second stem is moved in the first direction by the gas introduced through the connecting passage and released toward the second stem when the support part is in the molten state.