1, battery connection cable problem: the connection cable is not firmly connected, and poor contact may lead to fire; Improper specification of connecting wire (for example, too thin leads to increased resistance and serious heating); If the connection point is not well protected, if it is not treated with anti-oxidation and anti-wear, it may wear and corrode after long-term use, leading to arc or short circuit fire.
2. Quality problems of the battery itself: whether it is a lead-acid battery or a lithium battery, if there are internal manufacturing defects, such as impurities mixed in the battery, short circuit caused by diaphragm rupture, or high internal resistance and poor stability of the battery, it may cause fire or explosion due to heating.
3.PACK process problem: Poor assembly process of battery pack, such as unreasonable internal structure design and insufficient protection measures, leads to dendrite and short circuit under abuse conditions (such as overcharge and overdischarge), which increases the fire risk.
4. Charging equipment failure: charging with unqualified or mismatched chargers may lead to overheating and overcharge of the battery, especially in a closed environment with long-term charging, which is more likely to cause the battery to get out of control.
5. Improper installation of the battery: excessive sealing of the installation box will affect the gas discharge during battery charging and discharging, which may lead to internal pressure accumulation and explosion; When the connecting wire is installed, it is not well isolated from the car body, which makes the connecting wire wear during driving and causes short circuit.
6. Environmental factors: charging in high temperature and high humidity environment, charging or parking near flammable materials all increase the possibility of battery fire.
7. Illegal modification: Unauthorized or unreasonable modification of electric vehicles, including but not limited to changing battery types, increasing battery capacity, changing electrical circuits, etc. , may destroy the original safety design, thus causing a fire.