Integrated expansion kettle, cooling system and vehicle

An integrated expansion kettle, comprising:

• a kettle body;
• a chamber for containing liquid provided inside the kettle body;
• and
• a liquid inlet and a liquid outlet provided on the kettle body;
• wherein a coolant flow channel passing through the chamber is provided inside the kettle body;
• one end of the coolant flow channel is communicated with the liquid inlet, and the other end of the coolant flow channel is communicated with the liquid outlet;
• at least one group of gas-liquid separation mechanisms is provided on the coolant flow channel;
• each group of the gas-liquid separation mechanism comprises a first opening provided on the coolant flow channel for liquid in the chamber to flow into the coolant flow channel and a second opening for liquid in the coolant flow channel to flow into the chamber, and a pressure at the first opening is greater than a pressure at the second opening;
• and
• in response to that the kettle body is working, liquid and gas in the coolant flow channel is configured to flow into the chamber from the second opening, and liquid in the chamber is replenished into the coolant flow channel from the first opening.