NOVELTY - The electrochemical device (10) comprises electrodes, an electrolyte (16) arranged to conduct an ionic current from a first electrolyte surface in contact with one of the electrodes to a second electrolyte surface in contact with another of the electrodes, local sensors configured to detect an operating condition of the electrochemical device, and a controller to use data from the members of the local sensors to direct an adjustment of an operating parameter of the electrochemical device. One of the electrodes includes an electrochemically active fluid layer (18, 20) and a solid support (22).    USE - The electrochemical device such as a battery is useful in electric vehicles supported by green power generation.    ADVANTAGE - The electrochemical device has high durability, and improved energy density, performance, charging and discharging characteristics and thermodynamic efficiency.    DETAILED DESCRIPTION - The electrochemical device (10) comprises electrodes, an electrolyte (16) arranged to conduct an ionic current from a first electrolyte surface in contact with one of the electrodes to a second electrolyte surface in contact with another of the electrodes, local sensors configured to detect an operating condition of the electrochemical device, and a controller to use data from the members of the local sensors to direct an adjustment of an operating parameter of the electrochemical device. One of the electrodes includes an electrochemically active fluid layer (18, 20) and a solid support (22), where a surface of the active fluid layer is in contact with the electrolyte. Each local sensor is configured to detect the operating condition at a predetermined location within the device. One member of the local sensors is configured to detect the operating condition at locations within the device. The controller is further configured to respond to a history signal from the local sensors by modifying an operating parameter of the electrochemical device, and includes a memory and a transmitter. The local sensors include two sensors configured to detect different and/or same operating conditions, and are further configured to detect an operating condition in proximity to the surface of the electrochemically active fluid layer in contact with the electrolyte. The operating condition is: a gradient of a condition of the active fluid layer consisting of chemical composition, chemical activity, ion density, current density, temperature, flow velocity, flow direction, viscosity, surface tension, magnetic field magnitude, magnetic field direction, electrochemical potential, current and distance between two surfaces of the device; a position of a portion of a surface of the active fluid layer; and a local slope of a surface of the electrochemically active fluid layer relative to a component of the device. The active fluid layer is configured to cling to the solid support by a surface energy effect. The solid support includes a fluid-directing structure. The fluid-directing structure is configured to adjust a flow parameter of the active fluid layer in response to an operating condition detected by the local sensor. The electrolyte includes a solid surface impervious to the electrochemically active fluid, an ion-transport fluid through which an ion can move to produce the ionic current, and a solid structure. The electrochemically active fluid layer includes a liquid metal, an ionic fluid, a finely dispersed metal, a finely dispersed semi-metal, a finely dispersed semiconductor, or a finely dispersed dielectric. An INDEPENDENT CLAIM is included for a method of supplying electrochemical energy.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of an electrochemical device.    Electrochemical device (10)    Electrode (12)    Electrolyte (16)    Electrochemically active fluid layer (18, 20)    Solid support. (22)