Fuel cell stack

A fuel cell stack comprising:

• a first block having a first number of cells;
• a first fuel supply channel having a first fuel gas trunk channel and first branch channels branching off from the first fuel gas trunk channel, and adapted to parallelly supply the cells of the first block with fuel gas;
• a collecting channel for collecting the fuel gas which has passed through the cells of the first block;
• a second block having a second number of cells, the second number being smaller than the first number;
• a second fuel supply channel having a second fuel gas trunk channel and second branch channels branching off from the second fuel gas trunk channel, and adapted to parallelly supply the cells of the second block with the fuel gas which has passed through the cells of the first block and has been collected into the collecting channel;
• and
• a discharge channel for discharging the fuel gas which has passed through the cells of the second block, from the second block to an external section;
• the first fuel supply channel, the first block, the collecting channel, the second fuel supply channel, the second block, and the discharge channel being arranged sequentially from an upstream side along a direction of flow of the fuel gas;
• the fuel cell stack being characterized in that a throttling section capable of throttling the fuel gas and smaller in channel diameter than the first and second fuel gas trunk channels, the first and second branch channels, the collecting channel, and the discharge channel is provided at a position located downstream of the collecting channel and upstream of the second fuel supply channel.