Patent ID: 7736798

Claim:
A lid for an accumulator battery, comprising: a substantially flat main closure element for closing a container of the battery, the closure element defining a plurality of holes to afford access to the interior of the battery container, a secondary closure element which is mounted on the main element and in which there is a plurality of plugs that are fitted in the holes of the main element of the lid, and at least one duct formed in at least one of the main and secondary elements, wherein the at least one duct is in flow communication with the holes, and is provided for the discharge of the gases that are generated inside the battery container, wherein the main and secondary closure elements together form a box-like structure defining a chamber which is in flow communication with the holes and inside which the main and secondary elements are connected to one another by a plurality of partitions that extend substantially perpendicularly relative to the plane in which the main element extends and are arranged to define a labyrinth chamber which connects the holes of the main element with the gas-discharge duct; wherein for each of the subchambers, the plurality of partitions comprises radially concentric inner and outer circumferential walls surrounding the hole and defining a circumferential space there between, the concentric inner and outer circumferential walls each having a passageway formed therein so that the circumferential space provides flow communication with the hole and the subchamber, wherein the passageways are positioned diametrically opposite one another; wherein the plurality of partitions comprises transverse walls interposed between each hole and an adjacent hole and extending to divide the labyrinth chamber into a plurality of subchambers, each subchamber housing one of the holes of the plurality of holes, each of the subchambers being in separate flow communication with a channel extending along a side of the chamber in fluid communication with the at least one duct; and wherein for each of the subchambers, the plurality of partitions comprises a central wall extending with a meandering shape in a direction substantially parallel to the transverse walls, the central wall being connected to the radially outer circumferential wall of the subchamber and to a respective one of the transverse walls to divide the subchamber into an open space in direct flow communication with the channel, and a blind space in flow communication with the channel through the open space, the passageway of the outer circumferential wall facing the blind space of the subchamber.