Expansion tank, cooling system, and vehicle

An expansion tank comprising a tank body;

• a first partition within the tank body, where the first partition is extended in a longitudinal direction of the expansion tank to divide an interior of the tank body into a first chamber and a second chamber, the first partition is provided with a first through hole, and the first chamber communicates with the second chamber through the first through hole;
• wherein the first chamber comprises a plurality of first sub-chambers, a third partition is provided between two adjacent first sub-chambers, the third partition is provided with a third through hole;
• and the second chamber comprises a plurality of second sub-chambers, a fourth partition is provided between two adjacent second sub-chambers, and the fourth partition is provided with a fourth through hole;
• and the third partition and the fourth partition are parallel to each other and perpendicular to and connected to the first partition;
• the tank body is provided with a pipe communicating with an interior of the tank body, and a side wall of the pipe is provided with a mixed liquid inlet;
• a second partition is provided within the pipe, one end of the second partition is connected to the side wall of the pipe and the other end of the second partition extends to the mixed liquid inlet so as to form a first channel and a second channel within the pipe;
• the mixed liquid inlet is connected to a side wall of the first channel and a side wall of the second channel;
• and in a direction perpendicular to an axis of the mixed liquid inlet, a first end of the first channel is connected to the first chamber, a second end of the first channel is closed, a first end of the second channel is connected to the second chamber, and a second end of the second channel is configured to be connected to a water pump.