Connection block

A fuel cell subsystem (1) comprising a fuel cell stack (2) and a cooling system (3) adapted to recirculate a supply of a cooling medium throughout the fuel cell subsystem (1) to cool the fuel cell stack (2), the cooling system (3) including a pump (6), a filter device (5), a hydrogen heat exchanger (18), and a connection block (20:40), the connection block (20;40) having a body with connections (21-29;

• 41,42,44,45,47,48), which are connected to one another by connection channels (31,33;51-54) defined by respective bores extending through the body, the connection channels (31,33;51-54) extending independently from one another through the connection block (20;40) to define respective independently extending fluid paths (14;34-36), wherein each connection channel is provided with a branching (16;32) and includes a fluid inlet connection (21-23;41,42), a first fluid outlet connection (24-26;44,47) and a second fluid outlet connection (27-29;47,48);
• wherein each connection channel includes at least one temperature sensor (71,72;101;102) for measuring a temperature in the fluid path and/or at least one pressure sensor (73,74;111,112) for measuring a pressure in the fluid path (14;34-36), wherein the fluid inlet connection (21-23;41,42) is in fluid communication with an outlet of the pump (6), wherein the first fluid outlet connection (24-26;44,47) is in fluid communication with the filter device (5), and wherein the second fluid outlet connection (27-29;47,48) is in fluid communication with the hydrogen heat exchanger (18).