Single-tank energy storage unit

The utility model relates to a single-tank energy storage unit. The single-tank energy storage unit comprises an energy storage tank body, a thermal storage working medium pump, a solar thermal collector, a heat transfer medium outlet and a heat transfer medium inlet; the heat transfer medium outlet and the heat transfer medium inlet are arranged in the energy storage tank body, the heat transfer medium inlet is connected with the solar thermal collector, and the heat transfer medium outlet is connected with the thermal storage working medium pump; the thermal storage working medium pump is connected with the solar thermal collector; a separation plate which is a heat insulation cylindrical sleeve is arranged in the energy storage tank body; a coil heat exchanger is arranged outside the separation plate; an energy releasing medium inlet and an energy releasing medium outlet are further arranged in the energy storage tank body, and the energy releasing medium inlet is arranged below the energy releasing medium outlet; an energy utilization device is connected between the energy releasing medium inlet and the energy releasing medium outlet. The single-tank energy storage unit is simple and compact in structure, easy to use, low in manufacturing costs and wide in working temperature range.