END COVER ASSEMBLY, BATTERY CELL, BATTERY, POWER CONSUMPTION DEVICE AND LIQUID INJECTION METHOD

The present application relates to an end cover assembly, a battery cell, a battery, a power consumption device and a liquid injection method. The end cover assembly (10) is applied to the battery cell (600) and includes an end cover (1), a sealing piece (2) and a cover body (3), wherein the end cover (1) is provided with a first hole (11) for injecting electrolyte; the sealing piece (2) is configured to seal the first hole (11); the cove body (3) is configured to cover at least part of the sealing piece (2), and the cover body (3) is rotatable relative to the end cover (1) to realize detachable connection between the cover body (3) and the end cover (1); one of the sealing piece (2) and the cover body (3) is provided with a second hole (21), and the other one of the sealing piece (2) and the cover body (3) is provided with a boss (31); and the boss (31) is configured to be inserted into the second hole (21), and the boss (31) and the second hole (21) are relatively rotatable to realize rotatable connection between the sealing piece (2) and the cover body (3).