Battery cell, battery, and electrical device

A battery cell, comprising:

• a case;
• a first battery cell arranged inside the case, the first battery cell comprising a first main body part, a first electrode lead-out component extending from a first side of the first main body part, and a second electrode lead-out component extending from a second side of the first main body part, and the first side and the second side being arranged oppositely;
• and
• a second battery cell arranged inside the case, the second battery cell comprising a second main body part, a third electrode lead-out component extending from a third side of the second main body part, and a fourth electrode lead-out component extending from a fourth side of the second main body part, and the third side and the fourth side being arranged oppositely;
• wherein the first battery cell and the second battery cell are arranged in a first direction, the first side and the third side are adjacent and arranged oppositely, and the first electrode lead-out component and the third electrode lead-out component are electrically connected.