Covestro’s polycarbonate for cell holders and frames
Covestro’s polycarbonate blends for cell holders and frames for lithium-ion batteries are flame-retardant and meet category V-0 of Underwriters Laboratories' UL94 flammability classification, even at low wall thicknesses down to 0.75 mm (0.03 in). They are also impact-resistant over a wide temperature range—especially at sub-zero temperatures. The company’s protective products include battery modules, cell holders, and crash absorbers.
“When it comes to cell holders and the integration of battery cells into modules, flame protection is particularly important,” said Dr. Julian Marschewski from Covestro. He added, “The properties of the materials used in the battery environment play a decisive role in passing the many functional and safety tests on the finished component and contribute to the battery's safe operation over its entire life cycle."
The company says a flame-retardant polycarbonate acrylonitrile-butadiene-styrene (ABS) blend of the Bayblend FR type is ideal for cell holders and battery modules. It is temperature-resistant and dimensionally stable, and the parts can be produced efficiently with injection molding. The plastic is also used in mobile GreenPack rechargeable batteries from the Berlin-based manufacturer of the same name.
A crash absorber developed by Covestro is made of the polybutylene-terephthalate (PC-PBT) Makroblend KU-2 7912/4, which has high impact strength and particularly high ductility at low temperatures. The honeycomb structure contributes to the extreme impact resistance of the crash absorber.
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