Liquid cooling device and battery pack

A battery pack, comprising:

• a battery box and a liquid cooling device, wherein the liquid cooling device is disposed within the battery box;
• and
• wherein the liquid cooling device comprises:
• a plurality of liquid cooling plates;
• a plurality of metal tubes, wherein each metal tube of the plurality of metal tubes is configured to connect two liquid cooling plates of the plurality of liquid cooling plates, and an end of a metal tube of the plurality of metal tubes is inserted into a communication port of a liquid cooling plate of the two liquid cooling plates in a sealed manner;
• and
• a plurality of connectors, wherein a connector of the plurality of connectors is disposed at a joint between the metal tube and the liquid cooling plate, the metal tube is connected to the connector, the connector is connected to the liquid cooling plate, a distance between the connector and the liquid cooling plate is adjustable, and a depth to which the metal tube is inserted into the communication port varies with the distance between the connector and the liquid cooling plate.