Patent ID: 8906531

Claim:
Module comprising a casing in which a plurality of electric energy storage assemblies are arranged, each electric energy storage assembly extending along a longitudinal axis, the electric energy storage assemblies being arranged in the casing so that their longitudinal axes are parallel to one another and are perpendicular to an upper wall and a lower wall of the casing, each electric energy storage assembly comprising a first face in thermal contact with whilst being electrically insulated from the lower wall of the casing, and a second face opposite the first face, the second face being capped with a cover electrically connected to said electric energy storage assembly, wherein the upper wall of the casing comprises means for holding the first faces of the electric energy storage assemblies against the lower wall of the casing and which also allow swelling of the covers capping the second faces, the swelling of the covers being due to an increase of the internal pressure of the electric energy storage assemblies caused by the production of gases in the electric energy storage assemblies, wherein the means for holding comprise at least one of a cutout in the upper wall to allow said swelling and a compressible material disposed between the upper wall and a connector provided on the second faces of the electric energy storage assemblies, wherein the compressible material fills the space between the upper wall and the connector, said material being compressed to a nominal value lower than its maximum compression value to allow swelling of the electric energy storage assemblies by a thickness lying between a thickness corresponding to said nominal value of the material and a thickness corresponding to the maximum compression value of said material.