Membrane electrode assembly and fuel cell battery

A membrane electrode assembly for use in a fuel cell battery, the membrane electrode assembly comprising:

• an electrolyte membrane;
• an anode catalyst layer formed on a first surface of the electrolyte membrane;
• a cathode catalyst layer formed on a second surface of the electrolyte membrane;
• an anode gas diffusion layer stacked on the anode catalyst layer;
• and
• a cathode gas diffusion layer stacked on the cathode catalyst layer, wherein
• the anode catalyst layer, the cathode catalyst layer, the anode gas diffusion layer, and the cathode gas diffusion layer have the same thermal insulation performance per thickness, and
• the membrane electrode assembly satisfies all relations of T1+T3<T2+T4, T1<T2, and T3>T4 where a thickness of the anode catalyst layer in a stacking direction is defined as T1, a thickness of the cathode catalyst layer in the stacking direction is defined as T2, a thickness of the anode gas diffusion layer in the stacking direction is defined as T3, and a thickness of the cathode gas diffusion layer in the stacking direction is defined as T4.