Composite pane having an electrically heatable coating

Abstract

The invention relates to a composite pane having an electrically heatable coating, which comprises: at least two panes; an intermediate layer, which connects the panes to one another; at least one transparent, electrically conductive coating on at least one side of at least one of the panes which faces the intermediate layer; and at least two bus lines, which are connected to the transparent, electrically conductive coating, wherein a first bus line is electrically connected to a first feed line provided for connection to one pole of a voltage source and a second bus line is electrically connected to a second feed line provided for connection to the other pole of the voltage source. The transparent, electrically conductive coating contains silver, has a sheet resistance of 1 ohm / square to 10 ohms / square and has n notches, n being an integer >2, which divide the coating into a plurality of coating regions, wherein the coating regions are serially electrically connected to one another, and wherein the notches are formed such that the resistance of the transparent, electrically conductive coating has a heating power of 300 W / m2 to 1000 W / m2 at an operating voltage provided by the voltage source in the range of more than 100 V to 400 V, in particular in the range of 280 V to 400 V, and wherein a coating section of the electrically conductive coating located in the region of a shortest geometric distance between the first bus line and the second bus line is electrically interrupted by a plurality of notches, wherein the number of notches is selected in dependence on the magnitude of the operating voltage provided such that a voltage drop over an individual notch, by which two adjacent coating regions are electrically separated from one another, is less than a breakdown voltage of the notch.

Description

technical field

[0001] The invention relates to a composite window with an electrically heatable coating, in particular an electrically heatable vehicle window. The invention furthermore relates to the use of the composite window according to the invention as a vehicle window, in particular as a vehicle window for electric vehicles. Background technique

[0002] An electric vehicle refers to a vehicle that is powered by electricity. The drive energy is mostly delivered in the form of rechargeable accumulators and rechargeable batteries in the car or is generated by a fuel cell in the car itself. Electric motors convert electrical energy into mechanical energy for continued motion. The onboard voltage of an electric vehicle is typically 100V to 400V.

[0003] The range of electric vehicles is strongly limited due to the limited energy storage density of batteries or rechargeable batteries. Therefore, the efficient utilization of electrical energy is of special importance ...

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