Battery system for engineering machinery

The invention discloses a battery system for engineering machinery. The battery system comprises a bottom support, a battery box, a water cooling unit and a high-voltage box, and the bottom support is used for connecting and fixing. And the battery box is connected to the bottom support. The water cooling unit is positioned outside the battery box, is detachably mounted on the bottom support and/or the battery box, and is connected to a cooling pipeline in the battery box through a pipeline. The high-voltage box is located outside the battery box, the high-voltage box is detachably connected to any one or more of the bottom support, the battery box and the water cooling unit, and the high-voltage box is electrically connected with the battery box and the water cooling unit. According to the battery system for the engineering machinery, the battery box, the water-cooling unit and the high-voltage box are not arranged in the same box shell, so that the battery box, the water-cooling unit and the high-voltage bo