NOVELTY - Part solid, part fluid electrochemical cell (C1) comprises: many plate electrodes (101), where each plate electrode includes an array of apertures (102); at least one solid rod electrode, where the solid rod electrodes are arranged such that each solid rod electrode extends a length along an independent solid rod alignment axis passing through an aperture of each plate electrode; at least one porous rod electrode; and at least one electrolyte provided between the solid rod electrodes and the plate electrodes and the porous rod electrodes.    USE - The part solid, part fluid and flow electrochemical cell is useful as a metal-air battery, lithium-air battery, zinc-air battery, and lithium-water battery (claimed).    ADVANTAGE - The electrochemical cell: is cheaper and more effective larger systems in comparison to the current systems; can be buried under the ground or can be put in a room to stay away from the environmental hazards including temperature changes; and can be controlled at the boundaries such as by pulling the cables/ rods/wires to minimize the risk of electrical shorts.    DETAILED DESCRIPTION - Part solid, part fluid electrochemical cell (C1) comprises: many plate electrodes (101), where each plate electrode includes an array of apertures (102), and the plate electrode are arranged in a substantially parallel orientation such that the each aperture of an individual plate electrode is aligned along an independent plate alignment axis passing through an aperture of each of the other plate electrodes; at least one solid rod electrode, where the solid rod electrodes are arranged such that each solid rod electrode extends a length along an independent solid rod alignment axis passing through an aperture of each plate electrode; at least one porous rod electrode, where the porous rod electrodes are arranged such that each porous rod electrode extends a length along an independent porous rod alignment axis passing through an aperture of each plate electrode; and at least one electrolyte provided between the solid rod electrodes and the plate electrodes and the porous rod electrodes, where the electrolyte is capable of conducting charge carriers, and a first surface area includes a cumulative surface area of the plate electrodes, a second surface area includes a cumulative surface area of each aperture array, a third surface area includes a cumulative surface area of each of the solid rod electrodes and a fourth surface area includes a cumulative surface area of each of the porous rod electrodes. a flow electrochemical cell (C2) comprising: the plate electrodes; at least one porous rod positive electrode, where the porous rod positive electrodes are arranged such that each porous rod positive electrode extends a length along an independent positive electrode alignment axis passing through an aperture of each plate electrode; at least one porous rod negative electrode, where the porous rod negative electrodes are arranged such that each porous rod negative electrode extends a length along an independent negative electrode alignment axis passing through an aperture of each plate electrode; and at least one electrolyte provided between the porous rod negative electrodes and the plate electrodes or between the porous rod negative electrodes and the porous rod positive electrodes, where a first surface area includes a cumulative surface area of the plate electrodes, a second surface area includes a cumulative surface area of each aperture array, a third surface area includes a cumulative surface area of each of the porous rod positive electrodes and a fourth surface area includes a cumulative surface area of each of the porous rod negative electrodes.    DESCRIPTION OF DRAWING(S) - The figure shows a view of component of a three-dimensional electrode array embodiment, for a three-dimensional electrode array useful in a part solid, part fluid electrochemical cell.    Plate electrode (101)    Apertures (102)