Battery, battery pack and electric vehicle

A cell, comprising a metal housing, and a plurality of accommodating cavities, a plurality of electrode core assemblies, and an encapsulation film arranged in the metal housing, wherein

• the electrode core assemblies are arranged along a first direction and connected in series;
• a length of each of the electrode core assemblies extends along the first direction;
• each of the electrode core assemblies comprises an electrode core assembly body, and a first electrode and a second electrode configured to lead out a current;
• the first electrode and the second electrode are respectively arranged on two sides of the electrode core assembly body along the first direction;
• at least one of the accommodating cavities is defined by the encapsulation film;
• the electrode core assembly body is arranged in the at least one of the accommodating cavities;
• a length of the cell extends along the first direction;
• a thickness of the cell extends along a second direction perpendicular to the first direction;
• and a ratio of the length to the thickness of the cell ranges from 5 to 250.

A battery pack, comprising a cell array comprising a plurality of cells, wherein each of the cells comprises a metal housing, and a plurality of accommodating cavities, a plurality of electrode core assemblies, and an encapsulation film arranged in the metal housing;

• the electrode core assemblies are arranged along a first direction and connected in series;
• a length of each of the electrode core assemblies extends along the first direction;
• each of the electrode core assemblies comprises an electrode core assembly body, and a first electrode and a second electrode configured to lead out a current;
• the first electrode and the second electrode are respectively arranged on two sides of the electrode core assembly body along the first direction;
• at least one of the accommodating cavities is defined by the encapsulation film;
• the electrode core assembly body is arranged in the at least one of the accommodating cavities;
• a length of each of the cells extends along the first direction;
• a thickness of each of the cells extends along a second direction perpendicular to the first direction;
• and a ratio of the length to the thickness of the cell ranges from 5 to 250.