Cell unit body structure and metal fuel cell

The invention discloses a cell unit body structure and a cell combination mode, and belongs to the technical field of fuel cells. The cell unit body structure comprises cell bodies which are constructed into an annular hollow structure and are provided with upper connectors at the upper ends and/or provided with lower connectors at the lower ends; air electrodes which are mounted on the side surfaces of the cell bodies, and are configured to be symmetrical with the axes of the cell bodies; metal cathodes which are positioned in the cell bodies; and current collectors which are arranged on the air electrodes and are used for guiding flow of the air electrodes of two adjacent cell bodies. According to the invention, the cell bodies are spliced through the upper and lower connectors and are connected in parallel through the current collectors, so that the reaction area of the air electrodes and the metal cathodes is increased. Therefore, different numbers of cell bodies can be flexibly selected and combined acco