A cell (100), a battery module (300), a battery pack (200), and an electric vehicle (1000) are provided. The cell (100) includes a metal housing (11) and at least one electrode core assembly array (14) encapsulated inside the metal housing (11). The electrode core assembly array (14) includes N rows and M columns of electrode core assemblies (12), and the electrode core assembly (12) includes an encapsulation film and at least one electrode core encapsulated inside the encapsulation film. In a length direction of the cell (100), the electrode core assemblies (12) are arranged in rows and each row includes M electrode core assemblies (12). In a thickness or height direction of the cell (100), the electrode core assemblies (12) are arranged in columns and each column includes N electrode core assemblies (12). The N electrode core assemblies (12) in each column are connected in series to form an electrode core assembly string (13). The M electrode core assembly strings (13) are connected in series. M and N are integers greater than 1. An air pressure between the metal housing (11) and the encapsulation film is lower than an air pressure outside the metal housing (11).