A battery cell may include a housing, an electrode assembly, and a first support structure. The housing may be provided with an accommodating cavity. The electrode assembly may be accommodated in the accommodating cavity, and include a main body portion and a thinned portion. At least one end of the main body portion in a first direction may be connected to the thinned portion. The first support structure may be arranged corresponding to the thinned portion, and configured to support the thinned portion when the electrode assembly is expanded.