Dreamweaver International’s DreamWeaver Gold battery separator combines microfibers and nanofibers in a porous substrate that has very high temperature stability without significant thermal shrinkage up to 300°C.
Large format batteries such as those used in electric vehicles, aircraft, grid storage or uninterrupted power supplies are more difficult to design for safety than cell phone or laptop batteries because each cell holds much more energy. Thermal events, as have happened recently in batteries in the Boeing Dreamliner, happen when the internal temperature of the battery rises to between 135 and 160 C. This temperature range corresponds to the melting point of traditional separators, and above this temperature the internal reactions can generate enough heat to result in thermal runaway, which can cause smoke, ignition and even explosions.
DreamWeaver Gold is stable for up to 150°C higher temperatures than these traditional membranes, which is expected to enhance the safety of large format batteries, offering significant advantages over conventional separators.
“By providing a battery separator with far higher temperature stability, we are giving battery manufacturers a tool to enhance their design of safety mechanisms, which is expected to significantly reduce the risk of ignition in high power, high capacity batteries,” said Dr. Brian Morin, Dreamweaver’s co-founder and the inventor of the patent pending technology.
DreamWeaver Gold is available for customer development in thicknesses from 25 to 40 microns, with rolls cut to customer specifications.