Safety device for a lithium electrochemical generator battery

A safety device for a lithium electrochemical generator battery, comprising:

• a box designed to be placed in a compartment and configured to house a plurality of lithium electrochemical generators, said box comprising a plurality of assembled walls, an opening making it possible to introduce the electrochemical generators;
• a cover designed to be arranged gas-tightly on the opening of the box, allowing the introduction of the electrochemical generators;
• an opening forming a vent situated in one of the walls of the box or situated in the cover,
• a conduit comprising two openings where one of the openings is designed to be gas-tightly connected to the opening forming a vent of the box;
• a covering part designed to be positioned gas-tightly at an opening of a wall of the compartment and the second opening of the conduit, and where said covering part comprises a portion adapted to tear at a threshold pressure Ps;
• wherein the walls of the box, the cover, the conduit and the covering part are secured to each other so as to ensure sealing against the gases up to a pressure above the threshold pressure Ps, and where the materials of the box, the cover, the conduit and the sealing part, capable of being in contact with the gases emitted by the lithium electrochemical generators, are materials dimensioned to withstand the gases emitted by said lithium electrochemical generators and withstanding at least a temperature of 150° C.