Valve, battery and power consumption device

A battery comprising a box, a battery cell, and a valve, the battery cell being disposed in the box, the valve being disposed on the box, and the valve comprising:

• a valve body comprising a fluid channel, the fluid channel comprising a first end and a second end;
• a barrier disposed in the fluid channel and separating the fluid channel into a first cavity and a second cavity, wherein the first cavity is in fluid communication with the first end, the second cavity is in fluid communication with the second end, and the barrier is provided with a first through hole and a second through hole communicating the first cavity and the second cavity;
• a first unidirectional valve core configured to close or open the first through hole;
• and
• a second unidirectional valve core configured to close or open the second through hole, opening directions of the first unidirectional valve core and the second unidirectional valve core being opposite such that a difference between a fluid pressure at the first end and a fluid pressure at the second end is within a preset range.