Pre-charging control method and device for energy storage system and energy storage system

The invention discloses a pre-charging control method and device for an energy storage system and the energy storage system. The method comprises the steps that preset pre-charging time and a preset pre-charging pressure difference threshold value are obtained; determining whether pre-charging fails or not according to preset pre-charging time and a preset pre-charging pressure difference threshold value; when the pre-charging fails, acquiring real-time electrical parameters and at least two pre-charging fault thresholds of the pre-charging loop; comparing the real-time electrical parameter with a pre-charging fault threshold value, and determining a pre-charging fault type according to a comparison result; determining a corresponding pre-charging fault processing strategy according to the pre-charging fault type; the pre-charging fault processing strategy at least comprises a pre-charging overtime fault processing strategy, a pre-charging over-current fault processing strategy and a pre-charging short-circui