Cell, battery module, battery pack, and electric vehicle

A cell, comprising a housing and at least one electrode core assembly array encapsulated in the housing, wherein

• the at least one electrode core assembly array comprises N rows and M columns of electrode core assemblies, and each of the electrode core assemblies comprises an encapsulation film and at least one electrode core encapsulated in the encapsulation film;
• electrode core assemblies of a row are arranged along a length direction of the cell, and each of the N rows comprises M electrode core assemblies;
• and electrode core assemblies in a column are arranged along a thickness direction or a height direction of the cell, and each of the M columns comprises N electrode core assemblies;
• the N electrode core assemblies in each column are connected in series to form an electrode core assembly string;
• the M electrode core assembly strings are connected in series;
• M and N are integers greater than 1;
• and
• an air pressure between the housing and the encapsulation film is lower than an air pressure outside the housing, and an air pressure within the encapsulation film is lower than the air pressure between the housing and the encapsulation film.