Fuel cell system including gas exhaust and water flow paths and insulator

A fuel cell system, comprising a fuel cell stack including:

• a plurality of laminates of membrane electrode assemblies stacked via separators;
• and
• a pair of end plates holding the plurality of laminates from both sides, wherein
• in a stacking direction of the laminates, the fuel cell stack further includes:
• a pair of terminal plates respectively located between the plurality of stacked laminates and the pair of end plates;
• and
• a pair of insulators respectively located between the pair of terminal plates and the pair of end plates disposed outside the pair of terminal plates, the fuel cell system further comprising:
• a gas exhaust flow path for discharging a reaction gas extended in the stacking direction of the laminates and configured to have one end located inside the fuel cell stack and the other end located outside the fuel cell stack;
• and
• a water discharge flow path provided at a lower position than the gas exhaust flow path in an installation state of the fuel cell stack and formed to pass through at least part of the laminates, wherein
• the gas exhaust flow path is interconnected with the water discharge flow path via at least one connecting section in the fuel cell stack,
• the gas exhaust flow path includes a narrowed flow path having smaller sectional area than sectional area of an adjacent flow path in downstream of the connecting section, the narrowed flow path being formed in a downstream insulator, wherein in a flow direction of the reaction gas flowing in the water discharge flow path, the downstream insulator is located on a downstream side out of the pair of insulators and made of resin, and
• the water discharge flow path has a downstream end connecting with the narrowed flow path.