Provided are a battery cell, a method and system for manufacturing the battery cell, a battery, and a power consuming device. The battery cell according to this embodiment includes an electrode assembly, a housing, a pressure relief mechanism, and a cap assembly. The housing is provided with an accommodating space for accommodating the electrode assembly, and includes a first side plate on a side in a first direction; the pressure relief mechanism is arranged on the first side plate; and the cap assembly is configured to seal the housing; wherein an inner surface of the first side plate of the housing is provided with a first passageway extending along the inner surface, and the first passageway is configured to direct a gas in the accommodating space to the pressure relief mechanism, such that the pressure relief mechanism is actuated and relieves a pressure when the pressure reaches a threshold.