Yangwang U7 Undergoes Extreme Testing to Validate Ultra-Fast Charging Reliability
BYD’s premium brand Yangwang recently completed a durability test on the U7 sedan, using a randomly selected production vehicle from a showroom for a nine-day high-intensity trial in Nanning, China. During the test, the vehicle sustained speeds of 240 kph (149 mph), covering a total distance of 30,000 kilometers (18,600 miles) while completing 350 flash charging cycles. Each charge, from 10% to 97%, took just nine minutes. Post-test battery health assessments revealed only a 1.3% capacity degradation, retaining 98.7% of its original capacity and providing empirical data on the long-term reliability of ultra-fast charging technology.
Rigorous Test Conditions Push Battery Limits
The test was conducted in Nanning, where average temperatures reached 36°C (97°F). The vehicle operated at sustained high speeds in extreme heat while utilizing a 640 kW peak-power flash charging system. The Yangwang U7’s second-generation flash charging technology can replenish the battery from 10% to 60% in five minutes and from 10% to 97% in nine minutes. Throughout the test, the vehicle’s battery thermal management system had to simultaneously manage the thermal stress from high-speed driving, elevated ambient temperatures, and ultra-fast charging, comprehensively evaluating the battery’s durability and safety.
BYD stated that the test vehicle was a standard production model without special modifications, ensuring the results reflected real-world usage conditions. The 350 charging cycles simulated the energy consumption equivalent to driving 30,000 kilometers, replicating scenarios of long-term, high-frequency use of ultra-fast charging. Test results indicated that battery temperatures remained within safe limits, with no performance degradation or safety risks due to overheating.
Battery Degradation Performance Exceeds Expectations
Post-test battery health assessments showed that the Yangwang U7’s battery capacity degraded by only 1.3%, significantly lower than industry expectations for early-stage battery degradation. Typically, batteries experience the steepest degradation during the initial phase of their lifespan before stabilizing. The test results demonstrated that even under extreme conditions—high temperatures, sustained high speeds, and ultra-fast charging—the U7’s battery and thermal management system effectively controlled degradation, validating its reliability in demanding environments.