A
metal-air fuel
battery system with follow-up adjustment of a large-sized
anode is provided, which relates to a technical field of a battery. The
battery system includes a flexible case, a follow-up adjustment module and a drive mechanism, where the flexible case, as an electrochemical reaction space, is configured to accommodate an
electrolyte solution and a
metal ingot therein, and have a flexible air
electrode embedded in an inner wall thereof; the follow-up adjustment module is configured to change a shape of the flexible case according to a
size change of the
metal ingot, to reduce the electrochemical reaction space; and the drive mechanism is configured to control action of the follow-up adjustment module.