FUEL CELL STACK

• Main Authors: ICHIHARA KEIJI, SUEHIRO MASATO
• Format: Patent
• Language: English; Japanese
• Published: 01.12.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a fuel cell stack with which it is possible to suppress a decrease in flow channel sectional area for input from the lamination direction.SOLUTION: Provided is a fuel cell stack formed by laminating fuel cell units, each having a power generation cell that is formed with a fuel electrode and an air electrode across an electrolyte layer, a fuel electrode current collector that is connected to the fuel electrode side face of the power generation cell, an air electrode current collector that is connected to the air electrode side face of the power generation cell, and a separator that is electrically connected to some of the current collectors, wherein either of the current collectors has a bottom part, a wall part, and a spring part, the spring part, in the laminated state, being joined to the separator of an adjacent fuel cell unit, the spring and the wall parts forming a plurality of flow channels between the electrode and the separator that extend in a direction orthogonal to the lamination direction and are parallel to each other, the arrangement of a plurality of wall parts and the extending direction of a plurality of spring parts being line symmetrical with respect to the middle flow channel among a plurality of flow channels.SELECTED DRAWING: Figure 2 【課題】積層方向からの入力に対して流路断面積の減少を抑制し得る燃料電池スタックを提供する。【解決手段】燃料極と空気極とで電解質を挟んで形成された発電セルと、発電セルの燃料極側の面に接続された燃料極集電体と、発電セルの空気極側の面に接続された空気極集電体と、いずれかの集電体と電気的に接続されたセパレータとを有する燃料電池ユニットを積層してなる燃料電池スタックにおいて、いずれか一方の集電体は、底部と壁部とバネ部とを有し、積層状態でバネ部は隣接する燃料電池ユニットのセパレータと接合され、バネ部及び壁部によって、電極とセパレータとの間に積層方向と直交する方向に延びかつ互いに平行な複数の流路が形成され、複数の壁部の配置と複数のバネ部の延びる方向は、複数の流路のうちの中央の流路に対して線対称となっていることを特徴とする燃料電池スタック。【選択図】図２