End plate, fastening bar, and fuel cell stack including the same

A fastening bar for a fuel cell stack comprising:

• a bar main body in contact with an outside of the fuel cell stack;
• and
• a coupling part coupled to an end plate of the fuel cell by bending one end and the other end of the bar main body in one direction,
• wherein the bar main body and the coupling part formed integrally comprise:
• a design layer;
• and
• a property layer connected with the design layer to exert mechanical properties,
• wherein the design layer and the property layer are made of a composite material;
• and
• wherein surfaces in contact between the design layer and the property layer are coupled together by heat bonding by resin heat generated in an injection process:
• wherein the property forming part comprises:
• a first property part and a second property part that are formed to be symmetrical with respect to surfaces in contact with each other;
• wherein each of the first property part and the second property part comprises:
• a property main body having a weight reduction groove formed on both ends of a terminal hole in a longitudinal direction;
• a first rib formed on both ends of the property main body in the longitudinal direction to secure mechanical properties;
• and
• a second rib formed on both ends of the property main body in a width direction to secure mechanical properties, and
• wherein the property main body of the first property part and the property main body of the second property part are in contact with each other, the first rib of the first property part and the first rib of the second property part face each other at an interval, and the second rib of the first property part and the second rib of the second property part are disposed to face each other at an interval and disposed to be vertically symmetrical with respect to surfaces with which the first property part and the second property part are in contact.

A fastening bar for a fuel cell stack comprising:

• a bar main body in contact with an outside of the fuel cell stack;
• and
• a coupling part coupled to the end plate by bending one end and the other end of the bar main body in one direction,
• wherein the bar main body and the coupling part formed integrally comprise:
• a property layer made of a composite material to exert mechanical properties;
• wherein surfaces in contact between the main bar body and the coupling part are coupled together by heat bonding by resin heat generated in an injection process,
• wherein the property forming part con:
• a first property part and a second property part that are formed to be symmetrical with surfaces in contact with each other;
• wherein each of the first property part and the second property part comprises:
• a property main body having a weight reduction groove formed on both ends of a terminal hole in a longitudinal direction,
• a first rib formed on both ends of the property main body in the longitudinal direction to secure mechanical properties, and
• a second rib formed on both ends of the property main body in a width direction to secure mechanical properties, and
• wherein the property main body of the first property rt and the property main body of the second property part are in contact with each other, the first rib of the first property part and the first rib of the second property part face each other at an interval, and the second rib of the first property part and the second rib of the second property part are disposed to face each other at an interval and disposed to be vertically symmetrical with respect to surfaces with which the first property part and the second property part are in contact.