NOVELTY - The waterproof case comprises an assembly of metal plates, and an elastomer joint (71). The first metal plate is pierced with a series of holes in a covering zone. The second metal plate is pierced with a series of holes placed compared to those of the first metal plate in the covering zone. The two metal plates are covered in the covering zone and assembled in the covering zone by rivets (81-84). The elastomer joint is placed in continuity with the covering zone and present in continuous contact with the first and second plates so as to complete the sealing of the case.    USE - The waterproof case is useful for a battery (claimed) that is useful in a vehicle such as train.    ADVANTAGE - The waterproof case has good structural behavior even after being subjected to strong vibrations, and avoids the use of welding to assemble the plates thus reducing cost and eliminating the need for qualified personnel for the welding operation.    DETAILED DESCRIPTION - The waterproof case comprises an assembly of metal plates, and an elastomer joint (71) that comprises a material consisting of butyl rubber, ethylene-propylene-diene terpolymer and rubber nitrile. The first metal plate is pierced with a series of holes in a covering zone. The second metal plate is pierced with a series of holes placed compared to those of the first metal plate in the covering zone. The two metal plates are covered in the covering zone and assembled in the covering zone by rivets (81-84), where each rivet includes a head, a stem and a bulb. The head and the bulb of each rivet support on a surface of each plate extending beyond a surface from each hole. The stem of each rivet is deformed so as to occupy the entire volume of the holes of the first and second plates in a watertight manner. The elastomer joint is placed in continuity with the covering zone and present in continuous contact with the first and second plates so as to complete the sealing of the case. The first metal plate is placed in the covering zone towards an interior of the case and brought into contact with an alkaline electrolyte, and the second plate is placed in the covering zone towards an outside of the case and not in contact with the alkaline electrolyte, such that the series of holes of the first plate in the zone of covering is placed in the vicinity of a field of the first plate, and the joint elastomer covers the field. Each metal plate comprises a plane plate, a folded plate, and a section plate. The assembly of plates is obtained only using the rivets and deprived of welding. The joint is preformed and placed in a side of the covering zone and not compressed by the action of the rivets or placed in the covering zone between the first and second plates and is compressed by the action of the rivets.INDEPENDENT CLAIMS are included for:    (1) a method for manufacturing of a waterproof case;    (2) a method for designing an assembly of a waterproof case for a battery;    (3) a computer program product; and    (4) an information medium readable by a computer.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic perspective view of a waterproof case.    Left side plate (31)    Right side plate (33)    Batteries (51-54)    Elastomer joint (71)    Rivets. (81-84)