Battery cell casing

Battery cell casing comprising a first casing element (1) with a first contact surface (7) and a second casing element (2) with a second contact surface (8), wherein in an assembled position the first and second contact surfaces (7, 8) contact each other and the first and second casing elements (1, 2) encase active materials (9, 10) of a battery cell in an interior space, and wherein at least one gas-tight seal layer is arranged between the first and second contact surfaces (7, 8) to seal the interior space, characterized in that one of the first and second contact surfaces (7;

• 8) comprises an electrically insulating void volume layer and the other of the first and second contact surfaces (7;
• 8) comprises a formable material layer, which fills voids on a surface of the void volume layer hermetically in the assembled position to form the seal layer.