FUEL CELL STACK AND MANUFACTURING METHOD OF DUMMY CELL

• Main Authors: INOUE DAISUKE, UMEZAWA KENSUKE, AOKI TOMOJI
• Format: Patent
• Language: English; Japanese
• Published: 12.12.2019
• 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 capable of improving its power generation stability without degrading durability of an electrolyte membrane, with the use of a dummy cell which can be laminated on power generation cells while suppressing a rise in local surface pressure; and a method of manufacturing the dummy cell.SOLUTION: A fuel cell stack 10 at least comprises: a laminate 14 in which a plurality of power generation cells 12 each having an electrolyte membrane-electrode assembly are laminated; and a first dummy cell 18 disposed on one end side in a lamination direction in the laminate 14. A dummy structure of the first dummy cell 18 is formed by laminating, in the lamination direction, a first conductive porous body, a second conductive porous body, and a third conductive porous body in this order. A first bonding layer, which is interposed between the first conductive porous body and the second conductive porous body so as to bond them to each other, and a second bonding layer, which is interposed between the second conductive porous body and the third conductive porous body so as to bond them to each other, are located at different positions in the lamination direction.SELECTED DRAWING: Figure 2 【課題】局所的な面圧上昇を抑制しつつ発電セルに積層することが可能なダミーセルにより、電解質膜の耐久性を低下させることなく発電安定性を向上させることが可能な燃料電池スタック及びダミーセルの製造方法を提供する。【解決手段】燃料電池スタック１０は、電解質膜・電極構造体を有する発電セル１２を複数積層した積層体１４と、積層体１４の積層方向の一端側に配設される第１ダミーセル１８を少なくとも備える。第１ダミーセル１８のダミー構造体は、第１導電性多孔質体と、第２導電性多孔質体と、第３導電性多孔質体とを積層方向にこの順に積層して形成される。第１導電性多孔質体と第２導電性多孔質体の間に介在して互いを接合する第１接合層と、第２導電性多孔質体と第３導電性多孔質体の間に介在して互いを接合する第２接合層との積層方向の位置が互いに異なる。【選択図】図２