FUEL CELL SYSTEM

To improve durability of a fuel cell system including a valve gear and reliability of the operation of the valve gear.SOLUTION: A fuel cell system comprises a fuel cell, a cathode off-gas exhaust channel part, a gas-liquid separator, and a cover member. The gas-liquid separator has: a main body part; a first exhaust channel part that is connected with a lower portion of the main body part, has a first valve seat formed at its end, and discharges at least water accumulated in the main body part; and a first valve device having a first valve body that is configured to be contactable with the first valve seat and adjusts the degree of opening of the first exhaust channel part, and a first driving part that drives the first valve body. The cover member covers, of the gas-liquid separator, at least the first exhaust channel part and the first valve seat and has, between the gas-liquid separator and the cover member, a gas channel forming part that forms a gas channel communicating with the cathode off-gas exhaust channel part. The gas channel is arranged such that a cathode off-gas flowing into the cover member is in contact with the first exhaust channel part and the first valve seat and not in contact with the first driving part.SELECTED DRAWING: Figure 1 【課題】弁装置を含む燃料電池システムの耐久性、弁装置の動作の確実性を向上させる。【解決手段】燃料電池システムは、燃料電池と、カソードオフガス排出流路部と、気液分離器と、カバー部材とを備える。気液分離器は、本体部と、本体部の下方部分に接続され、端部に第１弁座が形成され、少なくとも本体部に溜まった水を排出するための第１排出流路部と、第１弁座に接触可能に構成されて第１排出流路部の開度を調整する第１弁体と、第１弁体を駆動する第１駆動部と、を有する第１弁装置とを有する。カバー部材は、気液分離器のうち、少なくとも第１排出流路部と第１弁座とを覆い、自身と気液分離器との間に、カソードオフガス排出流路部と連通するガス流路を形成するガス流路形成部を有する。ガス流路は、カバー部材に流入するカソードオフガスが第１排出流路部および第１弁座に接触し、第１駆動部に接触しない配置とされている。【選択図】図１