BYD has outlined the technology behind its second-generation Blade Battery, which the Indonesian report says is used in models including the Denza D9 and Z9GT. The company says the design is the result of six years of research and brings together higher energy density, more efficient ion movement and improved thermal management.
Energy density is up 5% compared with the previous generation, while BYD says fast charging capability has been maintained. The battery uses a system called FlashPass to reduce internal resistance in its lithium-iron-phosphate (LFP) cells. Its three elements are a Flash-Release cathode with graded particles, an AI-optimized Flash-Flow electrolyte, and a Flash-Intercalate anode designed to let lithium ions move in three dimensions.
BYD has also redesigned the solid electrolyte interphase, or SEI, layer to balance ion conductivity with chemical stability. A self-repairing feature is intended to help preserve the layer and battery durability. In tests highlighted by the company, flash charging alongside nail penetration caused no thermal runaway, smoke or fire, even after 500 charging cycles. A separate test that forced short circuits in four cells simultaneously reportedly produced no fire or explosion, despite temperatures exceeding 700°C.