Battery pack

A battery pack (10, 10′, 20, 30, 40, 50) comprising:

• a flat battery cell (B1, B2) including a flat electric power generating element (A), at least one armor material (4) for sealing said flat battery cell, and a positive tab (1a) and a negative tab(2a) extending from said electric power generating element to the outside of the armor material through sealings (4A1, 4A2, 4A3, 4A4) of said armor material;
• a circuit board (6) connected to said positive tab and said negative tab;
• and
• a container (16, 26, 36, 46, 56) having two main walls (12a, 14a;
• 12′, 14a;
• 22a, 24a;
• 32a, 34a;
• 42a, 44a;
• 52a, 54a) extending along two main surfaces of said flat battery cell,
• wherein at least a portion of said circuit board is positioned in a space (8, 8′) defined by the sealing (4A4) of said armor material beside said circuit board and an inner surface of said container, and at least one of the two main walls of said container is at least partially formed of a metal plate.