What are the causes of BYD Han fires?

[EmmanuelMarie]

BYD Han fires can be attributed to two main types: short circuits in electrical wiring or internal battery short circuits. Additional information: 1. Lithium battery heat generation issue: Lithium battery materials are more prone to heat generation during charging and discharging, and with the continuous increase in energy density, the possibility of thermal runaway also rises. If the battery pack is deformed during a car collision, causing the battery separator to tear and internal short circuits, it can easily lead to a fire due to electrolyte leakage. 2. Electrolyte issue: The 'growth' of lithium batteries consumes the electrolyte, which can cause battery short circuits, leading to combustion or explosion. Even if the above issues are addressed, it is difficult to avoid heat generation in power batteries during charging and use. Equipping vehicles with an excellent battery thermal management system is also key to reducing the risk of spontaneous combustion. However, due to cost constraints, many new energy vehicles only use natural cooling methods, leading to spontaneous combustion caused by battery overheating in new energy vehicles.