Battery pack and vehicle

A vehicle, comprising a battery pack,

• wherein the battery pack comprises at least two layers of battery modules, wherein each of the battery modules comprises cells and a tray for carrying the cells, the trays of two directly adjacent layers of the battery modules have sides, on which the cells are not arranged, arranged to face each other and connected to each other in a sealed manner, and a space between the two trays defines a pressure relief chamber after being sealed;
• the pressure relief chamber is in communication with a pressure relief opening, the tray is provided with through holes, and one side, on which the cells are arranged, of the tray is in communication with the pressure relief chamber through the through holes;
• wherein two directly adjacent layers of the battery modules are arranged in a first direction, the battery pack further comprises a partition arranged within the pressure relief chamber, and the partition partitions the pressure relief chamber into a first chamber and a second chamber arranged in the first direction;
• wherein the tray comprises a body and a boss protruding from an outer periphery of the body, the cells are carried in the body, the through holes are arranged in the body, the body is provided with a recess on one side, facing away from the cells, of the body, the boss is provided with an avoidance groove on one side, facing away from the cells, of the boss, the recess is in communication with the avoidance groove, a groove bottom of the avoidance groove is provided with the pressure relief opening, and the recesses of the two trays define, together with the partition, the first chamber and the second chamber, respectively;
• and
• wherein two directly adjacent layers of the battery modules are arranged in a vertical direction, the first chamber is in communication with the second chamber, and the pressure relief opening is arranged in the tray of the battery module located in a lower layer.