GM's windshield heating system would use an EV battery's DC current to heat embedded elements in the glass.
In a patent application published by the United States Patent and Trademark Office on July 13, 2023 , GM describes a more sophisticated heated windshield design that would use embedded elements and draw power from an EV's battery pack to remove ice, mist, and other obstructions to vision.Windshield heating is mostly done by blowing hot air onto the windshield from internal vents.
Embedding electrically conductive elements in the windshield can heat the surface more evenly, because these elements can be spread across the surface. Unlike the defrosting grids used on rear windows, it wouldn't limit visibility, GM claims. But according to GM, the limited power available from 12-volt AC automotive accessory electrical systems—the typical source of electricity in an internal-combustion car—would limit the effectiveness of such a system.
Patented ideas don't always make it to production, but a heated windshield like this could be useful not only for improving visibility in wintry conditions, but also potentially for improving
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