Integrated electric control box, water chilling unit and energy storage system

The utility model relates to an integrated electric control box, a water chilling unit and an energy storage system. The integrated electric control box comprises a box body, a control board, a power board and a contactor, wherein the control board, the power board and the contactor are integrally arranged in the box body. A first power supply module and a main control board of the water chilling unit which are connected with each other are arranged on the control board, and a second power supply module is arranged on the power board; the first power supply module is used for connecting external power supply equipment; the second power supply module is used for connecting the external power supply equipment and an electric device of the water chilling unit; and the contactor is used for connecting the external power supply equipment and a heater of the water chilling unit. According to the invention, the occupied space can be reduced, the wiring is simplified, and the cost is reduced.