Cooling liquid filling method and cooling liquid filling tool for energy storage device

The invention relates to the technical field of energy storage, and particularly discloses a cooling liquid filling method and a cooling liquid filling tool for an energy storage device.The cooling liquid filling method comprises the steps that the inlet end of a cooling liquid flow channel of a part to be filled with liquid is connected with a liquid inlet pipe of the cooling liquid filling tool, and the outlet end of the cooling liquid flow channel is connected with a liquid outlet pipe to form a liquid filling flow channel; a liquid storage container, a liquid inlet pipe, a cooling liquid flow channel and a liquid outlet pipe of the cooling liquid filling tool are sequentially connected in series; wherein the to-be-injected part is a cooling system or a battery box of the energy storage device; a driver of the cooling liquid filling tool is controlled to operate, and the driver drives the cooling liquid in the liquid storage container to flow to the cooling liquid flow channel along the liquid filling flow channel; and when the cooling liquid injected into the cooling liquid flow channel reaches the preset liquid amount, the driver is controlled to stop, and the to-be-injected part and the pipe set are detached and separated. By adopting the cooling liquid filling method, the cooling liquid can be filled into the cooling system and the battery box of the energy storage device which is delivered out of a factory and transported to a destination.