DAMPING ELEMENT

Abstract

A damping element for a battery/accumulator system is arranged between the battery/battery system and a floor of a motor vehicle.

Claims

1. Damping element (4) for a battery/accumulator system, in particular of an electric vehicle, comprising a viscoelastic, covered PUR foam (1) comprising: (a) a density in the range 20 to 65 kg/m.sup.3, (b) a loss factor greater than 0.2, (c) which meets, in particular, the burning behaviour requirements specified by the OEM, (d) the foam (1) being covered over its entire surface with a nonwoven (2), (e) the nonwoven (2) is coated on the side facing away from the foam (1), (f) has vent openings (3) in the cover seam, the cover bend and/or in the cover lip; and (g) the damping element (4) is arranged in a compressed manner in the range from 25 to 75% between the battery/battery system and the motor vehicle floor of an electric vehicle.

2. The damping element (4) according to claim 1, wherein the nonwoven (2) covering the foam (1) has a copper or aluminium coating and, if appropriate, an anti-corrosion layer.

3. The damping element (4) according to claim 1, wherein the unpressed initial thickness of the foam (1) is determined by the gap between the car body sheet metal and the battery/accumulator system.

4. The damping element according to claim 1, wherein the initial unpressed thickness of the foam is in the range of 8 to 30 mm.

5. The damping element according to claim 4, wherein the initial unpressed thickness of the foam is in the range of 10 to 20 mm.

Description

Example of Embodiment

[0021] A damping element consisting of a commercially available viscoelastic PUR foam 1 (density 35 kg/m.sup.3, loss factor 0.4, thickness 20 mm, flammability fulfilling FMVSS 302) was covered with a chemically bonded polyamide spunbond nonwoven (80 g/m.sup.2, coating: copper+corrosion protection layer). Vent openings 3 were arranged in the cover bow. This damping element 4 was then arranged between the motor vehicle floor and the battery system of a passenger car. The degree of compression of the foam 1 was 40%.

[0022] FIG. 2 shows the acoustic efficiency when the passenger car is travelling at a constant speed of 80 km/h. The diagrams show the acceleration levels of the car body sheet metal measured on the passenger compartment side with and without the damping element. The diagrams show the acceleration levels of the car body sheet metal I measured on the passenger compartment side when driving at a constant speed of 80 km/h on the road with and without the damping element. In all three measured spatial directions, a significant improvement/level reduction is caused by the damping element.