PET vs. UV Coating: Lankwitzer’s Breakthrough Reshapes EV Battery Insulation

As EV battery energy densities exceed 300Wh/kg, the limitations of PET films—low thermal resistance (0.15 W/m·K) and slow processing—are becoming untenable. Lankwitzer’s UV coating combines aerogel nanoparticles with UV-curable acrylic resins to create a 50μm-thick barrier that withstands 10G vibrations and temperatures up to 150°C. Testing at BYD’s Nanjing facility revealed a 60% reduction in thermal runaway propagation speed compared to PET films.

Material Science Innovation
Lankwitzer’s coating integrates boron nitride nanosheets into a crosslinked polymer matrix, achieving a thermal conductivity of 0.012 W/m・K—75% lower than PET. This nanostructure also enhances flame retardancy, achieving UL94 V-0 certification without halogen additives. In contrast, PET films exhibit delamination and embrittlement after 1,000 thermal cycles (-40°C to 120°C), as shown in 第三方测试报告.

Manufacturing Revolution
The UV-curable formulation cures in 5 seconds under 365nm LED light, eliminating the need for energy-intensive ovens. This reduces production line length by 60% and increases throughput at Tesla’s Gigafactory by 25%, with a single line processing 300 cells per minute. Lankwitzer’s AI-driven quality control system ensures coating thickness uniformity within ±1μm, cutting defect rates to 0.03%.

Market Impact
Lankwitzer’s Osterwieck facility, operational since Q4 2025, produces 10 million meters of UV coating annually, targeting 40% of the global EV insulation market. The company’s partnerships with CATL and LG Energy Solution underscore its role in defining next-gen battery safety standards.