A battery box, comprising: a housing, a first wall of the housing being provided with a through hole; a pressure relief mechanism, the pressure relief mechanism comprising: a connecting mechanism, the connecting mechanism comprising an aperture and a first boss, the first boss being connected to an inner wall of the aperture and extending toward an axis of the aperture; a pressure relief sheet configured to be actuated to release an internal pressure of the battery box when the internal pressure reaches a threshold, the pressure relief sheet being arranged on a side of the first boss; a first protective sheet configured to prevent the pressure relief sheet from contacting an electrolytic solution and arranged on the other side of the first boss away from the pressure relief sheet; a compression ring configured to press the first protective sheet and arranged on a side of the first protective sheet away from the first boss; and a pressing structure connected to the connecting mechanism and being pressed toward the axis of the aperture to press the compression ring; wherein the first protective sheet is closer to a inside of the battery box than the pressure relief sheet; wherein a side surface of the pressure relief sheet away from the first protective sheet is provided with a first recess, a bottom wall of the first recess is provided with a second recess, and the pressure relief sheet is configured to fracture at the second recess to release the internal pressure of the battery box when the internal pressure reaches the threshold; wherein the pressure relief mechanism being arranged on the first wall through the connecting mechanism and being arranged corresponding to the through hole, and the first wall is a bottom wall or a side wall. a housing, a first wall of the housing being provided with a through hole; a pressure relief mechanism, the pressure relief mechanism comprising: a connecting mechanism, the connecting mechanism comprising an aperture and a first boss, the first boss being connected to an inner wall of the aperture and extending toward an axis of the aperture; a pressure relief sheet configured to be actuated to release an internal pressure of the battery box when the internal pressure reaches a threshold, the pressure relief sheet being arranged on a side of the first boss; a first protective sheet configured to prevent the pressure relief sheet from contacting an electrolytic solution and arranged on the other side of the first boss away from the pressure relief sheet; a compression ring configured to press the first protective sheet and arranged on a side of the first protective sheet away from the first boss; and a pressing structure connected to the connecting mechanism and being pressed toward the axis of the aperture to press the compression ring; wherein the first protective sheet is closer to a inside of the battery box than the pressure relief sheet; wherein a side surface of the pressure relief sheet away from the first protective sheet is provided with a first recess, a bottom wall of the first recess is provided with a second recess, and the pressure relief sheet is configured to fracture at the second recess to release the internal pressure of the battery box when the internal pressure reaches the threshold; wherein the pressure relief mechanism being arranged on the first wall through the connecting mechanism and being arranged corresponding to the through hole, and the first wall is a bottom wall or a side wall. a connecting mechanism, the connecting mechanism comprising an aperture and a first boss, the first boss being connected to an inner wall of the aperture and extending toward an axis of the aperture; a pressure relief sheet configured to be actuated to release an internal pressure of the battery box when the internal pressure reaches a threshold, the pressure relief sheet being arranged on a side of the first boss; a first protective sheet configured to prevent the pressure relief sheet from contacting an electrolytic solution and arranged on the other side of the first boss away from the pressure relief sheet; a compression ring configured to press the first protective sheet and arranged on a side of the first protective sheet away from the first boss; and a pressing structure connected to the connecting mechanism and being pressed toward the axis of the aperture to press the compression ring; wherein the first protective sheet is closer to a inside of the battery box than the pressure relief sheet; wherein a side surface of the pressure relief sheet away from the first protective sheet is provided with a first recess, a bottom wall of the first recess is provided with a second recess, and the pressure relief sheet is configured to fracture at the second recess to release the internal pressure of the battery box when the internal pressure reaches the threshold; wherein the pressure relief mechanism being arranged on the first wall through the connecting mechanism and being arranged corresponding to the through hole, and the first wall is a bottom wall or a side wall.