A silver BYD Seal electric sedan suddenly burst into flames on Hong Kong’s Tuen Mun Road, forcing traffic to a standstill near the busy Tsing Tin Interchange.
Preliminary findings from a technical inspection carried out at a BYD service center indicate that the vehicle itself was not the source of the fire. According to the investigation, the blaze was triggered by an external power bank – a portable charger – that had been left on the passenger seat.
Investigators believe the device experienced either a short circuit or a thermal runaway event, which then ignited materials inside the cabin.The Chinese EV giant later released an official statement stressing that the electric sedan’s internal systems functioned normally and that neither the battery pack nor the high-voltage architecture played a role in the initial ignition. While the fire ultimately caused extensive damage to the vehicle’s upper cabin structure, the company emphasized that the core propulsion and electrical systems were not responsible for the incident.BYD’s Blade Battery remained intact during car fireInvestigators also determined that the vehicle’s core battery system remained unaffected by the blaze. The inspection confirmed that the Blade Battery pack and the integrated chassis structure stayed intact throughout the incident. Although temperatures inside the cabin rose high enough to melt interior plastics and shatter or soften glass components, the battery cells themselves showed no signs of thermal runaway or internal failure, CarNewsChina reported.The resilience of the battery pack is largely attributed to the chemistry used in the system. Lithium iron phosphate batteries are significantly more resistant to overheating, with thermal runaway typically occurring only at temperatures above about 930°F. By comparison, conventional nickel-manganese-cobalt batteries can begin to enter thermal runaway at roughly 390°F.In addition to the chemistry, the battery pack’s structural design also played a key role. The pack uses a honeycomb-style aluminum framework that acts as a thermal shield, helping isolate the battery cells from external heat sources. As a result, even though the cabin fire generated temperatures high enough to melt interior materials, the flames were unable to penetrate the compartment housing the cells.Structural battery design highlights advanced safety engineeringThe vehicle is engineered on BYD’s e-Platform 3.0 architecture, which incorporates Cell-to-Body construction. In this layout, the battery pack is integrated directly into the chassis structure, allowing it to function as a load-bearing component rather than a separate module. This design contributes to a torsional rigidity of around 40,500 Nm/°, placing it in the range typically associated with luxury performance sedans.The battery pack itself uses a layered “sandwich” configuration with high-strength aluminum panels that help shield the cells from external forces and heat. In terms of occupant protection, the Seal is also equipped with a center airbag designed to reduce injuries caused by passengers colliding with one another during a crash, along with an advanced eCall system that can automatically notify emergency services if a severe impact is detected.In Hong Kong’s growing EV market, the BYD Seal competes directly with the Tesla Model 3. Deliveries of the Seal are estimated at around 4,200 units in 2025, compared with about 5,800 units for the Model 3. Both cars carry five-star Euro NCAP safety ratings, but their battery strategies differ. BYD highlights the thermal stability of its LFP-based Blade Battery, while Tesla uses different battery chemistries depending on the version, including LFP packs in some trims and higher-nickel NMC cells in others.
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