Battery device with protection against fire propagation

A battery device comprising:

• a casing having a plurality of sides including a bottom side, a top side opposite to said bottom side, two lateral sides, a front side, and a rear side opposite to said front side, wherein the plurality of sides are assembled to form a sealed container, wherein the top side, the bottom side, and the lateral sides extend beyond the front side to form a compartment coupled to and distinct from the sealed container, the casing comprising at least one outlet arranged at the rear side of the casing;
• a front panel arranged in front of the front side of the casing to form the compartment;
• and
• a battery cell pack located within the sealed container,
• wherein the sealed container is configured to prevent heated gases generated upon a malfunction of the battery cell pack from escaping the casing except via said at least one outlet,
• wherein a filter is arranged at said at least one outlet for limiting at least flames from escaping said casing, and
• wherein terminals for connection of the battery device to a load, another battery device or an external power source are arranged at the front panel.